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  • Cambridge University Press
  • International Union of Crystallography (IUCr)
  • 2020-2022  (2,931)
  • 1985-1989  (17,152)
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  • 1
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    Cambridge : Cambridge University Press
    Economics and philosophy 5 (1989), S. 79-90 
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  • 2
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    Cambridge : Cambridge University Press
    Economics and philosophy 5 (1989), S. 91-97 
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  • 3
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    Economics and philosophy 4 (1988), S. 243-266 
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    Notes: Recent years have seen the flowering of a new literature on the economic nature of firms marked by a concern with their internal organization and contractual characteristics. Related literatures on the principal-agent problem and the theory of financial markets have also contributed to a better understanding of firms as economic institutions. However, the place of the concept of the ownership of the firm is poorly developed in most of this literature, with many writers either ignoring the concept entirely or arguing that it is of no importance. The purpose of the present article is to point out that the concept of ownership of firms is crucial to an understanding of internal governance issues. Most economists implicitly presume that firms must be ownable and saleable if they are to be operated efficiently, and recently this viewpoint has been made more explicit by writers such as Jensen and Fama and Williamson. Their point of view is to some degree at odds with views of the firm as a coalition, which frequently appear in the same literature, and even more fundamentally in conflict with conceptions of the firm as an association or polity within which greater or lesser degrees of democracy in governance may be pursued. The first purpose of this article is to show that the incompletely articulated position of the leading authors on the economics of organization is that the firm is a commodity and must be so for purposes of efficiency.
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  • 4
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    Cambridge : Cambridge University Press
    Economics and philosophy 4 (1988), S. 291-291 
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  • 5
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    Cambridge : Cambridge University Press
    Economics and philosophy 4 (1988), S. 292-297 
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  • 6
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    Cambridge : Cambridge University Press
    Economics and philosophy 4 (1988), S. 298-308 
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  • 7
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    Cambridge : Cambridge University Press
    Economics and philosophy 4 (1988), S. 309-315 
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  • 8
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    Cambridge : Cambridge University Press
    Economics and philosophy 4 (1988), S. 316-325 
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  • 9
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    Cambridge : Cambridge University Press
    Economics and philosophy 4 (1988), S. 326-332 
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  • 10
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    Cambridge : Cambridge University Press
    Economics and philosophy 4 (1988), S. 333-336 
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  • 11
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    Cambridge : Cambridge University Press
    Economics and philosophy 4 (1988), S. 170-172 
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  • 12
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    Cambridge : Cambridge University Press
    Economics and philosophy 4 (1988), S. 173-175 
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  • 13
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    Cambridge : Cambridge University Press
    Economics and philosophy 4 (1988), S. 177-183 
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  • 14
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    Cambridge : Cambridge University Press
    Economics and philosophy 3 (1987), S. 1-2 
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  • 15
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    Cambridge : Cambridge University Press
    Economics and philosophy 4 (1988), S. 183-188 
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  • 16
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    Cambridge : Cambridge University Press
    Economics and philosophy 3 (1987), S. 1-10 
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  • 17
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    Cambridge : Cambridge University Press
    Economics and philosophy 3 (1987), S. 335-338 
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    Notes: Since Schweickart asserts that I have not addressed his main argument, let me consider briefly the four claims he advances at the beginning of his second reply.Regarding 1: To argue, as I have, that there would be a strong tendency for market socialism to degenerate into capitalism, it is necessary to spell out carefully what capitalism is. Following Marx, I defined capitalism as a system in which the workers do not control the means of production and the workers sell their labor power as a commodity. As G.A. Cohen has pointed out (Cohen, 1978, pp. 219–23), this definition can be given a rechtsfrei characterization in terms of effective powers over means of production and labor power. Actual legal arrangements are not the issue. In my original paper, I never said that the workers would sell the means of production. Thus 1 is irrelevant. The real questions are: (a) Who effectively controls the means of production? (b) Who effectively gets the profits? If the answer to both of these questions is, “Not the workers,” it follows that the workers are effectively proletarians and the system is a form of capitalism.
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  • 18
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    Cambridge : Cambridge University Press
    Economics and philosophy 3 (1987), S. 49-66 
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    Notes: I want in this paper to do two things. First, I want to respond to some studies that argue that people are often not rational: that people regularly and systematically depart from rationality. The conclusion itself does not worry me. I pressed for the same in a recent book (Schick, 1984). But the arguments seem to me wrong, and wrong in an interesting way. There may be something to be learned from seeing how and why they fail.
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  • 19
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    Cambridge : Cambridge University Press
    Economics and philosophy 3 (1987), S. 1-22 
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    Notes: In 1970 Amartya Sen exposed an apparent antinomy that has come to be known as the Paradox of the Paretian Libertarian (Sen, 1970b, pp. 152–57). Sen introduced his paradox by establishing a simple but startling theorem. Roughly put, what he proved was that if a mechanism for selecting social choice functions satisfies two standard adequacy conditions, there are possible situations in which it will violate either the very weak libertarian precept that every individual has at least some rights or the seemingly innocuous Paretian principle that an option should be judged unacceptable if there is an available alternative that everyone prefers to it. Many economists and philosophers have proposed solutions to Sen's problem, but there is no general consensus on what solution (if any) is correct. In the present paper I argue that Sen's original theorem fails to establish the existence of any conflict between libertarianism and Paretianism. Furthermore, I contend that Sen has misinterpreted certain other theorems which he has used to defend the existence of a paradoxical conflict between these two doctrines. In general, I try to show that whenever Sen posits a Paretian-libertarian conflict to explain an apparently troubling result in social choice theory, the difficulty can be better dealt with either by claiming that the theorem in question imposes overly strong background constraints on the form of social choice functions or by claiming that it relies on an unacceptable construal of individual rights.
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  • 20
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    Cambridge : Cambridge University Press
    Economics and philosophy 3 (1987), S. 127-130 
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    Topics: Philosophy , Economics
    Notes: In their article, Geoffrey Brennan and Loren Lomasky (1985, p. 199) present an alternative to market theories of voting behavior. Contrary to market theories which view the voter as acting to maximize the expected self-interest, the alternative view sees voting as fundamentally an act of self-expression: “Voting, like speech, is an expressive activity providing an outlet for one's moral sentiments. We suggest that it is the expressive return to a vote that frequently determines the behavior of individuals in large-number electorates.”
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  • 21
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    Cambridge : Cambridge University Press
    Economics and philosophy 3 (1987), S. 67-95 
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    Topics: Philosophy , Economics
    Notes: Is rhetoric just a new and trendy way to épater les bourgeois? Unfortunately, I think that the newfound interest of some economists in rhetoric, and particularly Donald McCloskey in his new book and subsequent responses to critics (McCloskey, 1985a, 1985b), gives that impression. After economists have worked so hard for the past five decades to learn their sums, differential calculus, real analysis, and topology, it is a fair bet that one could easily hector them about their woeful ignorance of the conjugation of Latin verbs or Aristotle's Six Elements of Tragedy. Moreover, it has certainly become an academic cliché that economists write as gracefully and felicitously as a hundred monkeys chained to broken typewriters. The fact that economists still trot out Keynes's prose in their defense is itself an index of the inarticulate desperation of an inarticulate profession.
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  • 22
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    Economics and philosophy 3 (1987), S. 139-142 
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    Notes: Rosenberg (1986) argues that economists have embraced the methodology of scientific research programs, and the writings of Imre Lakatos (1978), at the same time that philosophers have been abandoning that approach. According to Rosenberg, the methodology of scientific research programs (MSRP) appears to allow some work in economics, which is neither tested nor testable, to be “scientific” nonetheless. That is, MSRP justifies some current practices which look hard to justify on strict falsificationist, or dogmatic positivist, grounds.
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  • 23
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    Economics and philosophy 3 (1987), S. 131-138 
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    Notes: How may we best understand the motivational structure that stands behind individuals' acts of voting? In “The Impartial Spectator Goes to Washington” we suggested that expressive concerns swamp narrowly consequential motivations, in contradistinction to normal market transactions in which the priority is reversed. A striking consequence of this fact is that individuals will be led to vote for outcomes that they would reject were they in a position to act decisively. In this regard we found the moral psychology Adam Smith develops in The Theory of Moral Sentiments (TMS) (and, to a lesser extent, in The Wealth of Nations) remarkably fecund in suggesting alternatives to what we call the standard theory of electoral behavior.
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  • 24
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    Cambridge : Cambridge University Press
    Economics and philosophy 2 (1986), S. 282-291 
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  • 25
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    Economics and philosophy 2 (1986), S. 185-195 
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    Notes: Popper's well-known demarcation criterion has often been understood to distinguish statements of empirical science according to their logical form. Implicit in this interpretation of Popper's philosophy is the belief that when the universe of discourse of the empirical scientist is infinite, empirical universal sentences are falsifiable but not verifiable, whereas the converse holds for existential sentences. A remarkable elaboration of this belief is to be found in Watkins's early work (1957, 1958) on the statements he calls “all-and-some,” such as: “For every metal there is a melting point.” All-and-some statements (hereafter AS) are both universally and existentially quantified in that order. Watkins argued that AS should be regarded as both nonfalsifiable and nonverifiable, for they partake in the logical fate of both universal and existential statements. This claim is subject to the proviso that the bound variables are “uncircumscribed” (in Watkins's words); i.e., that the universe of discourse is infinite.
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  • 26
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    Cambridge : Cambridge University Press
    Economics and philosophy 2 (1986), S. 293-293 
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  • 27
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    Economics and philosophy 2 (1986), S. 225-244 
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    Notes: Perhaps the most salient feature of Rawls's theory of justice (Rawls, 1971) which at once attracts supporters and repels critics is its apparent egalitarian conclusion as to how economic goods are to be distributed. Indeed, many of Rawls's sympathizers may find this result intuitively appealing, and regard it as Rawls's enduring contribution to the topic of economic justice, despite technical deficiencies in Rawls's contractarian, decision-theoretic argument for it (see, e.g., Nagel, 1973, p. 234) which occupy the bulk of the critical literature. Rawls himself, having proposed a “coherence” theory of justification in metaethics, must regard the claim that his distributive criterion “is a strongly egalitarian conception” (Rawls, 1971, p. 76) as independently a part of the overarching moral argument. The alleged egalitarian impact of Rawls's theory is crucial again in normative ethics where Rawls is thought to have developed a major counter-theory to utilitarianism (cf. Braybrooke, 1975, p. 304), one of the most popular criticisms of which has been its alleged inadequacy in handling questions of distributive justice. Utilitarians can argue, however, as Brandt recently has, that the diminishing marginal utility of money, along with ignorance of income-welfare curves, would require a utility-maximizing distribution to be substantially egalitarian (Brandt, 1979, pp. 311f., 315f.; cf. Brandt, 1983, p. 102f.). The challenge is therefore for Rawls to show that his theory yields an ethically preferable degree of equality.
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    Economics and philosophy 2 (1986), S. 1-2 
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  • 29
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    Economics and philosophy 2 (1986), S. 1-3 
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  • 30
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    Economics and philosophy 1 (1985), S. 83-99 
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    Notes: Discussions of Karl Popper's falsificationist philosophy of science appear regularly in the recent literature on economic methodology. In this literature, there seem to be two fundamental points of agreement about Popper. First, most economists take Popper's falsificationist method of bold conjecture and severe test to be the correct characterization of scientific conduct in the physical sciences. Second, most economists admit that economic theory fails miserably when judged by these same falsificationist standards. As Latsis (1976, p. 8) states, “the development of economic analysis would look a dismal affair through falsificationist spectacles.”
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    Economics and philosophy 1 (1985), S. 101-108 
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    Notes: F. A. Hayek is uniquely responsible for his fellow economists grasping the importance of the decentralization of knowledge: as Hayek shows in his pathbreaking “The Use of Knowledge in Society,” knowledge nowhere exists as a coherent whole and to pretend otherwise is a most serious error. Hayek also shares responsibility for the popularity of a strong form of the methodological individualist research program which asserts that since collectives as such have no impact on the choices of individuals, investigators ought to purge any reliance on collectives from our analysis.
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    Economics and philosophy 1 (1985), S. 127-127 
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    Econometric theory 3 (1987), S. 467-469 
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    New York : Cambridge University Press
    Econometric theory 3 (1987), S. 1-1 
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    Econometric theory 3 (1987), S. 223-246 
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    Notes: In this paper we develop full information methods for estimating the parameters of a system of simultaneous equations with error component structure and establish relationships between the various structural estimators.
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    Econometric theory 3 (1987), S. 299-304 
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    Topics: Economics
    Notes: We derive exact finite-sample expressions for the biases and risks of several common pretest estimators of the scale parameter in the linear regression model. These estimators are associated with least squares, maximum likelihood and minimum mean squared error component estimators. Of these three criteria, the last is found to be superior (in terms of risk under quadratic loss) when pretesting in typical situations.
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    Econometric theory 3 (1987), S. 1-1 
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    Econometric theory 3 (1987), S. 69-97 
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    Notes: This paper addresses two related issues in the literature of non-nested hypotheses testing. Firstly, by means of a measure of “closeness” of probability density functions, it shows how any two hypotheses can be placed into the nested and the non-nested categories with the latter category being subdivided further into “globally” and “partially” non-nested hypotheses. Secondly, by emphasizing the distinction between a “local null” and a “local alternative,” the paper shows that only in the case of partially non-nested hypotheses is it possible to specify local alternatives. In this case the paper derives the asymptotic distribution of the Cox test statistic under local alternatives and shows that it is distributed as a normal variate with a mean which is directly related to the measure of “closeness” of the alternative to the null hypothesis.
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    Econometric theory 3 (1987), S. 159-159 
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    Econometric theory 3 (1987), S. 159-160 
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    Econometric theory 3 (1987), S. 162-162 
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    Econometric theory 3 (1987), S. 208-222 
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    Notes: Many observed macrovariables are simple aggregates over a large number of microunits. It is pointed out that the generating process of the macrovariables is largely determined by the common factors in the generating mechanisms of the microvariables, even though these factors may be very unimportant at the microlevel. It follows that macrorelationships are simpler than the complete microrelationships, but that empirical investigations of microrelationships may not catch those components, containing common factors, which will determine the macrorelationship. It is also shown that an aggregate expectation or forecast is simply the common factor component of the individual agents expectations.
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    Econometric theory 3 (1987), S. 247-271 
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    Notes: A Taylor series approach is used to derive approximations to the approximate slope of LR, W, and LM test statistics. These can be useful when the approximate slopes themselves are complicated. The results are applied to the test of linear coefficient restrictions in the linear model with a nonscalar covariance matrix. They can be used to find cases where the Wald test may badly over-reject in this model. The results shed some new light on the over-rejection that has been noted in the special cases of AR(1) disturbances and the SURE model.
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    Econometric theory 3 (1987), S. 359-370 
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    Notes: We compare the distributional properties of the four predictors commonly used in practice. They are based on the maximum likelihood, two types of the least squared, and the Yule-Walker estimators. The asymptotic expansions of the distribution, bias, and mean-squared error for the four predictors are derived up to O(T−1), where T is the sample size. Examining the formulas of the asymptotic expansions, we find that except for the Yule-Walker type predictor, the other three predictors have the same distributional properties up to O(T−1).
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    Econometric theory 3 (1987), S. 461-463 
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    Econometric theory 3 (1987), S. 464-466 
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    Econometric theory 3 (1987), S. 471-471 
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    Econometric theory 3 (1987), S. 169-169 
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    Econometric theory 3 (1987), S. 297-298 
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    Notes: In this paper we identify a restriction on the finite-sample application of Magdalinos's asymptotic expansions for the t statistic based on the k-class instrumental variable estimator.
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    Econometric theory 3 (1987), S. 305-306 
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    Econometric theory 3 (1987), S. 306-306 
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    Econometric theory 3 (1987), S. 1-44 
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    Topics: Economics
    Notes: In an hypothesis testing problem involving nuisance parameters for which boundedly complete sufficient statistics exist under the null hypothesis, the class of all similar regions for the problem is characterized by the conditional distribution of the data given these sufficient statistics. If there exists a one-to-one transformation y → (t, u) of the data, y, to the sufficient statistic, t, and a second vector of statistics, u, that is independent of t under the null hypothesis, then the statistic u itself characterizes the class of similar regions. This paper applies this idea to five testing problems of interest in econometrics. In each case we obtain the density of the relevant statistic under the null hypothesis, when it is free of nuisance parameters, and under the alternative. Using the density under the alternative, we discuss the power properties of the class of similar tests for each problem. Other applications are also suggested.
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    New York : Cambridge University Press
    Econometric theory 3 (1987), S. 143-149 
    ISSN: 0266-4666
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    Topics: Economics
    Notes: This article deals with the derivation of the exact discrete model that corresponds to a closed linear first-order continuous-time system with mixed stock and flow data. This exact discrete model is (under appropriate additional conditions) a stationary autoregressive moving average time series model and may allow one to obtain asymptotically efficient estimators of the parameters describing the continuous-time system.
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    Econometric theory 3 (1987), S. 160-161 
    ISSN: 0266-4666
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    Topics: Economics
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    Cambridge : Cambridge University Press
    Modern Asian studies 23 (1989), S. 797-813 
    ISSN: 0026-749X
    Source: Cambridge Journals Digital Archives
    Topics: Ethnic Sciences , History , Political Science , Economics
    Notes: The subject of this paper is the fate of progressive taxation in South Asia. This is a subject about which Kingsley Martin himself would have had mixed feelings. On the one hand, he strongly advocated a redistributive fiscal strategy. On the other hand, he was never at all comfortable examining the kind of economic analysis with which it is usually justified. Somewhat unfairly, he distrusted all orthodox economists on moral grounds (Martin, 1966: 34). Moreover, his prolonged encounter with the unorthodox economics of Maynard Keynes was equally unsatisfactory as an educational experience. Lord Boothby summed up Martin's efforts to learn the technicalities of economics from Keynes as follows: ‘Kingsley simply never understood economics and yet he was always trying to understand. “Explain it to me, then” he would say, but his attention soon wandered’ (Rolph, 1973: 195).
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    Cambridge : Cambridge University Press
    Modern Asian studies 23 (1989), S. 1-2 
    ISSN: 0026-749X
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    Topics: Ethnic Sciences , History , Political Science , Economics
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    Cambridge : Cambridge University Press
    Modern Asian studies 23 (1989), S. 459-492 
    ISSN: 0026-749X
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    Topics: Ethnic Sciences , History , Political Science , Economics
    Notes: Recently, we have come to see that the perceptions which we had of the decay and destruction of India in the eighteenth century were more than anything else a product of British writing which sought consciously or unconsciously to magnify and color the changes which took place in the eighteenth century to enhance the magnitude of their own ‘achievements’ from then onwards. ‘achievements’ from then onwards. Secondly, we have come to see the interaction of British desires for political security on the one hand and a steady income from land and other taxes as producing a situation first of depression in the first half of the nineteenth century and later of gradual underdevelopment at the end of the nineteenth and the beginning of the twentieth. It is therefore possible now to understand the unwillingness of the British administration in India to engage in any large-scale developmental activity which would upset the political balance which the British had established early in their relationship with landed and mercantile groups in the area. In this essay, I should like to address the connection between British support for landed groups in the agrarian area outside of Madras on the one hand and the colonial ‘discovery’ and reinforcement of traditions on the other, to understand both the nature of colonial control strategies and the genesis of Indian revivalism.
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    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 18 (1985), S. 53-54 
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
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    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 18 (1985), S. 54-54 
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    Applied crystallography online 18 (1985), S. 54-54 
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    Applied crystallography online 18 (1985), S. 55-60 
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    Topics: Geosciences , Physics
    Notes: The requirements imposed on the magnitude of the noise in a scattering curve in order to minimize the corresponding error in the structure functions are estimated for a given value of the time T in which the scattering curve is recorded. Typical small-angle X-ray scattering (SAXS) curves have been used to check how these conditions are fulfilled when different counting modes are applied for the measurement. It is shown that fixed-time counting is the most practical technique and produces error bands in the structure functions with magnitudes close to the smallest values attainable in SAXS investigations.
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    Applied crystallography online 18 (1985), S. 61-64 
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    Topics: Geosciences , Physics
    Notes: Following the procedure suggested by May, Ibel & Haas [J. Appl. Cryst. (1982), 15, 15–19] for the correlation of transmission data with the level of neutrons scattered incoherently into the full solid angle 4π measurements have been made of the transmission and incoherent scattering intensities of aqueous buffers of different H2O/D2O ratios at temperatures between 280 and 343 K. That it is possible to extend the proposed calibration procedure to absorbing-ions-containing buffers is also shown.
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    Applied crystallography online 18 (1985), S. 65-70 
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    Topics: Geosciences , Physics
    Notes: Small-angle neutron scattering experiments have been performed with aqueous dispersions of binary lipid mixtures. One component was protonated, the other was partly deuterated. By varying the mole fraction of the deuterated species the mean scattering-length density of the lipid lamellas and hence the contrast between liposomes and the solvent was changed. It is shown that this inverse contrast variation has the advantage of (i) a simpler data analysis, (ii) an increased resolution of homogeneous and heterogenous lipid distributions and (iii) a considerably increased sensitivity for the evaluation of phase diagrams in segregated lipid mixtures. Phase boundaries can now be determined to an accuracy of better than 1 mol%.
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    Applied crystallography online 18 (1985), S. 71-74 
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    Topics: Geosciences , Physics
    Notes: A very simple method is described to align accurately any full four-circle diffractometer with respect to the incident beam. This method relies on anomalous transmission measurements. It has been found that the centroids of the Ge 220 anomalous transmission intensity distributions measured at the four main positions of the χ circle, that is 0, 90, 180, and 270°, not only provide an accurate determination of the reference angles for ω and φ, but also provide an accurate method to align the χ circle with respect to the direction of the incident beam. This procedure promises to be even more helpful for diffractometers installed at synchrotron radiation laboratories than for in-house installations.
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    Applied crystallography online 18 (1985), S. 75-79 
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    Topics: Geosciences , Physics
    Notes: A computer program to calculate the contributions of crystal, capillary and a simple model of mother liquor to the overall absorption of X-rays has been written. It is based on the Gaussian quadrature method of integration; the crystal is described by the polyhedral faces bounding it, the capillary by its diameter, thickness and orientation with respect to the diffractometer axes and the mother liquor by the crystal faces that trap it between crystal and inner capillary wall. The program is written in Fortran for a VAX 11/780 computer and incorporates tables of mass absorption coefficients for silver, molybdenum and copper radiations for easy calculation of linear absorption coefficients.
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    Applied crystallography online 18 (1985), S. 80-84 
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    Topics: Geosciences , Physics
    Notes: A method is described for semiquantitative X-ray diffraction phase analysis, which involves the addition to the investigated multicomponent system of known large (about 80–95%) amounts of a crystalline substance originally not contained in the system. This results in a decrease of the diffraction line intensities of the components to be measured to small but detectable values. The weight fraction of a component is related to the added fraction of the doping substance and to the fraction of that component remaining in the doped sample. The method is very simple and yields the weight fractions of the major components in the system with a typical error of a few percent. The weight fractions of the minor components cannot be determined with fair accuracy in this way. The method is appropriate in cases where only a small amount of the investigated system is available. Optimum conditions to attain maximum accuracy of the method are discussed.
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    Applied crystallography online 18 (1985), S. 85-92 
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    Topics: Geosciences , Physics
    Notes: The use of a varying-step algorithm now allows the simulation of traverse topographs and of section topographs taking into account the real width of the incident beam. However, computation time remains a critical factor in practical use. With an array processor it is possible to decrease the computation time significantly. It is shown that pictures of good quality may be obtained in a reasonable time using local facilities. The influence of various parameters on the accuracy of the simulations is discussed. It is demonstrated that local machines can be more useful, in crystallography, than giant computers often difficult to reach through the network of communications.
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    Applied crystallography online 18 (1985), S. 106-109 
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    Topics: Geosciences , Physics
    Notes: A simple method for in situ alignment of samples in a double-crystal X-ray topography system is described. This method permits a specific crystallographic axis to be made coincident with the sample rotation axis used to set the Bragg angle. Surface reflections from approximately orthogonal crystallographic planes are required and tables of such planes suitable for alignment of cubic crystals are given. This procedure allows rapid setup for the other accessible surface reflection or transmission topographs.
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    Applied crystallography online 18 (1985), S. 114-119 
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    Topics: Geosciences , Physics
    Notes: This article presents mathematical methods for calculating the shoulder limit and detection limit for two merging Pearson VII functions. Results are given for the particular case of the modified Lorentzian (n = 2). The modified Marquardt algorithm of the data reduction program used by the authors is briefly discussed. Synthetic diffraction patterns are used to determine a practical detection limit for this program that compares favourably with the theoretical detection limit.
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    Applied crystallography online 18 (1985), S. 110-113 
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    Notes: With a highly convergent electron beam entering a small crystal area, the Bragg condition may be fulfilled simultaneously for many diffraction orders along a reciprocal-lattice direction, and reflections with (sin θ)/λ 〉 2 Å−1 are accessible. Considerations based on the dynamical theory of electron diffraction suggest that for Bragg reflections with (sin θ)/λ 〉 1 Å−1, 100 keV electrons can be treated quasi-kinematically when the crystal thickness is less than 1000 Å, and this is supported by experiments. This simple approach has been used to determine the D-induced static displacement modulation δ of V along the a axis (monoclinic indexing) in the β phase of V2D. From visual inspection of the Bragg intensities for large diffraction orders, up to (sin θ)/λ = 2.35 Å−1, it is concluded that δ = 0.070 (5) Å.
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    Applied crystallography online 18 (1985), S. 120-122 
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    Topics: Geosciences , Physics
    Notes: It is shown that an X-ray interferometer consisting of two crystals cut from different pieces of silicon material can be successfully operated. The dependence of the visibility of the interference pattern on different thicknesses of beam splitter and analyzer is investigated.
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    Applied crystallography online 18 (1985), S. 93-105 
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    Notes: A systematic study of the variations of the contrast of a dislocation in silicon on section topographs with the depth of the line was performed both experimentally and with computer simulations. Mo Kα1 radiation and 33{\bar 3} and {\bar 3}{\bar 3}3 symmetric reflections were used. The crystal thickness was 440 μm so that the value of μt was 0.64. The influence of the orientation of the dislocation was studied for values of the angle between the line and its Burgers vector ranging between 60 and 90° in the glide plane. It was observed that when the dislocation lies close to the entrance surface, whatever its orientation, its image is centred around the trace of the plane of incidence passing through the intersection of the dislocation with the direct beam while when the dislocation lies close to the exit surface its image is centred around the projection of the dislocation on the section pattern. The variation of the orientation of the image for intermediate depths of the dislocation is interpreted by means of the geometrical construction of the dynamical image. The values of the orientation of the image calculated according to this simple model are in good agreement with those measured on both experimental and simulated topographs. The same geometrical model enables the difference in the relative positions of the direct and dynamic images of stereo pairs to be explained. A new feature was observed in the simulated images and several of the experimental ones, namely a concentration of intensity along the projection of the dislocation in the reflected direction. Slit width was taken into account in the simulations for a better fit with experimental topographs but not polarization, which was taken to be normal to the plane of incidence. Because of the small value of the crystal thickness and of μt, the variation of the contrast with the Burgers vector is very small, making its determination very difficult.
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    Applied crystallography online 18 (1985), S. 130-130 
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    Applied crystallography online 18 (1985), S. 122-125 
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    Notes: The Rayleigh scattering of Mössbauer radiation has recently been applied to the study of disordered macromolecular systems. A general program has been developed for the analysis of the scattering intensities obtained with this technique. The methodology, which follows the line of the X-ray analysis of disordered systems, has been improved and it can provide information on the static and dynamic structures from the Fourier transform of the total and elastic scattering intensities. A flow-chart of the whole program with its main features and the organization of input-output are also described.
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    Applied crystallography online 18 (1985), S. 126-130 
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    Topics: Geosciences , Physics
    Notes: A computer program for simulating convergent-beam electron diffraction patterns from single crystals and bicrystals is described. The program is based on the dynamical theory of electron diffraction, and the intensity of a convergent-beam disc is constructed from the individual intensities of a number of plane waves incident on the specimen. For the bicrystal case, this program allows the influence of parameters such as the location of the boundary plane and a rigid translation at the boundary to be investigated. These effects are discussed for a horizontal (111) twin boundary in silicon.
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    Applied crystallography online 18 (1985), S. 131-134 
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    Notes: A simple analytic method to correct the experimentally observed spin-flip and non-spin-flip scattering cross sections in neutron polarization analysis experiments for the effects of multiple scattering is presented. From known parameters of the constituent elements of a specimen and from the measured experimental cross sections the single scattering cross sections can readily be determined. This is particularly useful in situations where the scattering is isotropic or exhibits only slight angular dependence.
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    Applied crystallography online 18 (1985), S. 135-140 
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    Notes: Reflecting properties of a double-crystal (DC) monochromator consisting of two elastically bent perfect silicon crystals in the parallel non-dispersive (1, −1) setting were experimentally treated. Using an unconventional fully asymmetric geometry, the effective mosaicity may be significantly enhanced up to the value of about 10−2 rad. Test experiments were performed on the 111 and 400 reflections for wavelengths of 0.2 nm and 0.157 nm, respectively. The experimental results obtained are found to be in good agreement with the theoretical predictions published in a previous paper [Mikula, Kulda, Vrána & Chalupa (1984). J. Appl. Cryst. 17, 189–195].
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    Applied crystallography online 18 (1985), S. 141-144 
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    Notes: Crystallographic properties of depleted uranium alloys (0.75 wt% Ti) with two different heat treatments were studied by neutron powder diffraction methods. The crystal structures are essentially the same as that of pure α-uranium metal, but with somewhat different unit-cell dimensions. The super-saturated Ti impurity in the quenched sample is primarily substitutional. Diffraction lines of the quenched uranium alloy showed a clear strain broadening. The r.m.s. strain obtained from the broadening was 0.0019.
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    Applied crystallography online 18 (1985), S. 145-149 
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    Notes: A new technique is described for performing high-pressure single-crystal neutron diffraction [up to 20 kbar (2 GPa) at room temperature], using a BeCu pressure cell, an area detector and the Los Alamos National Laboratory pulsed neutron source. Success of this method depends on the increase in information available with a multi-wavelength pulse neutron source, a novel orientation of a cylindrically symmetric pressure cell with its axis coincident with the neutron beam and a specific crystal orientation within the pressure cell. Bragg scattering from the pressure cell is avoided and background for a given 2θ is constant. For a crystal of orthorhombic or higher symmetry oriented with the incident beam passing midway between the major lattice vectors, it will be possible to refine a complete three-dimensional structure with data collected from only one pressure loading. Preliminary investigations of Tl3PSe4 lattice parameters (space group Pcmn) at 15(1)kbar yielded linear compressibilities (× 1000 in kbar−1) of Ka = 1.05(8), Kb = 1.50(10), Kc = 1.20(8). The anisotropic compressibility is explained by examination of the ambient-pressure room-temperature structure.
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    Applied crystallography online 18 (1985), S. 150-155 
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    Notes: An X-ray powder diffractometric procedure has been developed to determine the lattice parameters of long-chain hydrocarbons and mixtures thereof. Useful information was limited to low diffraction angles owing to the large size of the unit cell. Intensities were measured in the reflection mode for thick samples with low absorption. Centroids of the diffraction profiles were corrected for axial beam divergence, sample flatness, displacement and transparency and goniometer scale zero position. An internal Si standard was mixed with the sample to determine the displacement of the sample surface from the goniometer axis. The values of a, b and c for the orthorhombic structures n-tricosane (n-C23H48) are 4.965(3), 7.462(4) and 62.12(2) Å and for n-pentacosane (n-C25H52) are 4.964(3), 7.450(4) and 67.21(2) Å. The values agree well with earlier single-crystal studies except for c for which a larger value is reported in the earlier work, probably due to sample impurity.
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    Applied crystallography online 18 (1985), S. 156-158 
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    Notes: Crystal lattice parameters of mixtures of the normal alkanes n-C23H48 and n-C25H52 have been determined by X-ray powder diffractometry. The c-axis length increases nearly monotonically with increasing C25H52 content, a and b are larger for the mixtures than for the pure substances with maximum values at 15% n-C25H52. The small but significant increases in a of 0.6% and b of 0.9% have not been previously reported.
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    Applied crystallography online 18 (1985), S. 159-164 
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    Notes: An interactive program for comparison of experimental with theoretical martensitic transformation data and for orientation determination from Laue and zero-layer reciprocal-lattice photographs is described. The program can generate orthographic, gnomonic, Laue and zero-layer reciprocal-lattice projections of lattice vectors, circles and latitude-longitude nets. A utility for habit-plane calculation from surface trace data and its diagrammatical representation is provided. Drawings before and after transformation can be superimposed. Output from program MRTNST [Ledbetter & Wayman (1971). Mater. Sci. Eng. 7, 151–157] (altered to handle triclinic lattices) can be read directly by COATI, which also facilitates the graphical method of martensitic calculations. A lucid command language allows easy manipulation of previously complex procedures.
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    Applied crystallography online 18 (1985), S. 165-169 
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    Notes: A rigid-body refinement method and program for crystallography of macromolecules is described. Orientational and translational parameters are refined by fitting the molecular Fourier transforms to the observed structure-factor amplitudes. The range of convergence of the method has been tested on four examples with known crystal structure: PTI, chymotrypsinogen and two forms of α1 anti-trypsin. It was successfully applied in the structure solution of two unknown crystal structures: a third form of α1 anti-trypsin and C-phycocyanin.
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    Applied crystallography online 18 (1985), S. 170-172 
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    Notes: A chemical reaction, the hydration of CaSO4.½D2O, was followed in real time in an on-line neutron diffraction experiment at different temperatures. The results of the reactions are presented as diagrams showing the evolution of the intensities of CaSO4.2D2O in real time. The hydration passes through the formation of a gel interphase. The dehydration of CaSO4.2D2O was followed in the same way at temperatures up to 420 K.
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    Applied crystallography online 18 (1985), S. 173-180 
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    Notes: Analyses of high-resolution neutron powder diffraction data, using both the Pearson VII and pseudo-Voigt peak shape functions, have revealed a range of peak shapes from essentially Gaussian to Lorentzian and beyond. Moreover, the refinements show that the Lorentzian character of the peaks in each pattern increases with increasing diffraction angle. Both kinds of shape change are associated with varying relative contributions to the peak profiles of the instrumental resolution, isotropic crystallite strain and crystallite size effects. Rietveld analysis of powder data with the standard Gaussian form when the peaks have significant Lorentzian character has little effect on atomic positional parameters, but it leads to an overestimation of the thermal vibration coefficients and higher least-squares residuals.
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    Applied crystallography online 18 (1985), S. 181-183 
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    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: The anomalous scattering factors of zinc and silver in samples of Al-rich Al–Zn–Ag have been measured near their K-absorption edges. EXAFS spectra obtained from the Stanford Synchrotron Radiation Laboratory were converted to the imaginary part of the atomic scattering factor f′′ using the optical theorem. With a knowledge of f′′(E), f′, the real part of the atomic scattering factor, was determined from the Kramers–Kronig dispersion relation.
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  • 87
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    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 18 (1985), S. 183-184 
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: From a given initial unit cell the program generates new lattices that are distributed among crystal systems by a purely metrical criterion and sorted according to an empirical figure of merit. For each solution the output contains the new cell parameters along with the corresponding transformation matrix to be applied to the initial unit cell.
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  • 88
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    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 18 (1985), S. 188-189 
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
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  • 89
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    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 18 (1985), S. 190-190 
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
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  • 90
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    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 18 (1985), S. 185-188 
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: The restrained reciprocal-space least-squares refinement program of Hendrickson & Konnert [Computing in Crystallography, edited by R. Diamond, S. Ramaseshan & K. Venkatesan, pp. 13.01–13.25. (1980). Bangalore: Indian Academy of Sciences] has been modified to include non-bonded and/or hydrogen-bonded contacts between molecules related by symmetry operations and/or unit-cell translations. The modified program has been tested on an inhibited form of aspartate aminotransferase, which is an α2 dimeric enzyme with a crystallographic twofold axis relating the subunits. A number of heretofore unseen close contacts between atoms of separate subunits were located and correctly dealt with by the modified program.
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  • 91
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    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 18 (1985), S. 189-190 
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
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  • 92
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    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 18 (1985), S. 190-190 
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
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  • 93
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    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 18 (1985), S. 191-196 
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: A new method is described to determine accurately the intensities of reflexions in the case of oblique texture electron diffraction. The method is based on a comparison between experimental values of intensities and those calculated with a formalism that takes into account the orientation function of the particles. It allows the problems that arise from frequent overlapping of reflexions to be surmounted. A concrete example of the application of this method is given the structure refinement of a mica with muscovite–phengite composition.
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  • 94
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    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 18 (1985), S. 197-204 
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: Convergent-beam electron diffraction has been used to confirm the accepted space group of rutile (TiO2) and to study in detail the dependence of the intensity of the space-group-forbidden reflections on crystal thickness and orientation. The observations are shown to be in detailed agreement with computer-simulated patterns calculated using the standard structural parameters. The diffraction results provide a basis for understanding the high-resolution electron-microscope images of rutile crystals oriented close to the [001] zone in which the effects of the space-group-forbidden reflections are important. It is concluded that satisfactory agreement exists between experimental and calculated images provided that allowance is made for uncertainty in the orientation of the crystal.
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  • 95
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    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 18 (1985), S. 214-218 
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    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: A new integrated device for the structural study of liquid or amorphous compounds is described. The X-ray scattering pattern produced by the sample is quickly recorded by a micro-computer-controlled goniometer with position-sensitive detection. Interactive software allows both experimental data processing and simulation from structural models.
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  • 96
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    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 18 (1985), S. 205-213 
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    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: An improved transform technique has been developed [Gerber (1983). Thesis, Wilhelm-Pieck-University Rostock, German Democratic Republic] for calculating the particle size distribution N(R) for spherical particles with radii R from small-angle X-ray scattering data. This method permits N(R) to be calculated from analytical expressions that were derived for point collimation and for infinitely long slit collimation. A special procedure has been introduced in order to reduce termination errors. The technique described and those developed by Schmidt [Brill, Weil & Schmidt (1968). J. Colloid Interface Sci. 27, 479–492], Vonk [J. Appl. Cryst. (1976), 9, 433–440] and Glatter [J. Appl. Cryst. (1980), 13, 7–11] were used for calculating particle size distributions from theoretical scattering curves and from an experimental scattering curve of suspended SiO2 particles (Ludox). The results obtained by the different techniques were compared, and reasonable results are given by all methods employed. The accuracy of the size distributions calculated by the improved method is somewhat higher than that obtained by Schmidt's transform technique. With Glatter's procedure, the deviations from the exact distributions are comparable to those from this improved transform technique, but the use of Glatter's program requires a large computer, whereas the new method has the advantage of being suitable for a small computer. Vonk's program also requires a large computer, and the deviations obtained are larger than those produced by other methods. The experimental scattering curve of the Ludox sample was also evaluated by assuming a log-normal distribution for the particles. The parameters μ and σ of this function were determined from a set of small-angle X-ray scattering structural parameters. The resulting log-normal distribution is significantly different from the size distribution calculated by our method.
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  • 97
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    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 18 (1985), S. 237-240 
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    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: It is shown by anomalous X-ray scattering that the absolute configuration of LiIO3, originally determined by Li Yin-yuan, Fan Hai-fu & Chia Shou-chuan [Sci. Sin. (1973), 16, 130–135], is incorrect, in accordance with the prediction of Glazer & Stadnicka [(1985). Submitted to J. Appl. Cryst.]. Measurements of the optical rotatory dispersion are also reported.
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  • 98
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    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 18 (1985), S. 219-229 
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    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: Different functional parameterizations of the radiation intensity scattered by an N-component amorphous sample are considered. Each parameterization is such that (i) it depends only on the areas and on the angularities of the samples' interphase surfaces, (ii) it fulfils all the known physical constraints and (iii) it yields a rather simple algebraic expression both for the correlation function and for the scattered intensity. The parameterizations have been used for analysing the scattering data relevant to some three-component catalysts. Provided the volume fraction of the metal is not very small, the best fit yields satisfactory results only for some of the considered parameterizations. In this way, the determination of both the areas and the angularities of catalysts appears possible.
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  • 99
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    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 18 (1985), S. 230-236 
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: Solute partitioning during decomposition of a ternary alloy may be evaluated through the inversion of a system of linear equations, obtained by performing at least three independent small-angle scattering experiments. The merits of neutron scattering (with isotopic contrast) and of anomalous X-ray scattering (near the absorption edges) are compared. It appears that neutron scattering, although having good contrast, is not suited to these studies since slight structural differences between the three samples may lead to erroneous results. On the other hand, the use of the same sample in anomalous scattering avoids this problem, but with the drawback of a more ill-conditioned system. Nevertheless, the possibility of performing more than three anomalous experiments may improve the results and a new analysis of data is proposed.
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  • 100
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    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 18 (1985), S. 253-257 
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: An algorithm for a safe generation of the table of expected reflections in the Arndt–Wonnacott rotation camera is given. It relies upon classic quadratic matrix algebra. Some mathematical theorems are recalled. This algorithm is part of a series of programs developed at Orsay for the treatment of rotation-camera photographs.
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