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  • Springer  (252)
  • Wiley  (129)
  • 1995-1999  (354)
  • 1960-1964  (27)
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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Journal of chemical crystallography 28 (1998), S. 561-564 
    ISSN: 1572-8854
    Keywords: Acylcyanide ; cyanocarbonyl ; imidazole ; carbonyl cyanide
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract 1-t-Butyl-5-N-(dimethylaminomethylene)aminoimidazole-4-carbonyl cyanide (BUNDAMIC) is the first acyl cyanide to be synthesized from an imidazole-4-carboxylic acid, diethylphosphorocyanidate, and triethylamine and its structure determined by x-ray crystallography. It crystallizes with four molecules in the monoclinic space group C2/m with a = 17.824(2), b = 6.784(2), c = 11.039(2) Å, and β = 96.17(1)°; R = 0.036 over 1086 unique x-ray reflections. The cyanocarbonyl group is nearly linear, C-C≡ N angle 174.4(3)°, with dimensions C≡ N, 1.137(3); C-C 1.493(3); and C=O≡ N 1.224(3) Å. The imidazole ring, in the mirror plane, has a lengthened C4 = C5 bond of 1.421(3) A, and there is a short ring-closing approach, H⋯ O6 =2.07 Å, between the methyleneamino hydrogen and the carbonyl oxygen.
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  • 2
    ISSN: 1557-1947
    Keywords: Superconductivity ; research opportunities ; state of the art
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract This report surveys the considerable progress made over the last five years—such as the marketing of superconducting quantum interference devices (SQUIDs), cellular wireless filter systems, and high current leads—and assesses needs and opportunities in the areas of fundamental science, materials development, thin film and device applications, and wire and bulk applications. It examines the challenges facing high-temperature superconductivity: from the need to understand the mechanism of high-temperature superconductivity and the unusual “normal” state to the need for new instrumentation for material characterization. Advances in thin film and bulk materials are reviewed, and obstacles impeding the commercialization of HTS materials are examined.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1476-5535
    Keywords: Keywords: biotin production; E. coli bio operon; Agrobacterium/Rhizobium HK4; limiting growth conditions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: E. coli biotin (bio) operon was modified to improve biotin production by host cells: (a) the divergently transcribed wild-type bio operon was re-organized into one transcriptional unit; (b) the wild-type bio promoter was replaced with a strong artificial (tac) promoter; (c) a potential stem loop structure between bioD and bioA was removed; and (d) the wild-type bioB ribosomal binding site (RBS) was replaced with an artificial RBS that resulted in improved bioB expression. The effects of the modifications on the bio operon were studied in E. coli by measuring biotin and dethiobiotin production, and bio gene expression with mini-cells and two-dimensional polyacrylamide gel electrophoresis. The modified E. coli bio operon was introduced into a broad host-range plasmid and used to transform Agrobacterium/Rhizobium HK4, which then produced 110 mg L−1 of biotin in a 2-L fermenter, growing on a defined medium with diaminononanoic acid as the starting material. Biotin production was not growth-phase dependent in this strain, and the rate of production remained high under limiting (maintenance) and zero growth conditions.
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  • 4
    ISSN: 1572-8889
    Keywords: Vanessa atalanta ; Nymphalidae ; daily activity schedule ; start time ; territorial behavior ; behavioral thermoregulation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract We examined the relative importance of climatic factors and population density to territorial start time ofVanessa atalanta males. Start time varies with solar altitude and therefore with seasons. We removed seasonal effects by converting start times to corresponding solar altitudes. Start time solar altitude correlates primarily with ambient temperature (T a) and secondarily with substrate temperature (T s), regardless of cloud cover. Overcast cloud cover resulted in later not earlier start times as expected from reduced solar radiation (R⊙) levels. R⊙ may affect start time indirectly by affectingT s and later start times under overcast skies may be a result ofT s. Start times under solid overcast but not under broken overcast were different than under clear skies, suggesting thatV. atalanta males can use dim sun or blue patches in broken overcast as a start time cue. Early interaction frequency is correlated withT a and wind direction, but not with start time itself, suggesting that male population density is unimportant compared with climatic factors. We conclude thatV. atalanta has a climate-dependent start time but, also, that maintaining a relatively fixed daily schedule is more important to males than is achieving an optimal body temperature while perching.
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Journal of chemical crystallography 28 (1998), S. 171-175 
    ISSN: 1572-8854
    Keywords: Cyclophane ; cis ; trans ; internal strain ; tetrathia
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Both the cis and trans isomers of 3,11,18,26-tetrathiatricyclo[26.2.2.15,9.213,16.120,24] hexatriaconta-5,7,9,20,22,24-hexene have been prepared and structurally characterized. Each of these centrosymmetric tetrathia dimers includes two cyclohexane rings in chair conformations with either 1,4-cis or 1,4-trans bonding and two meta-substituted benzene rings. The cis isomer packs into the monoclinic space group P21/a with a = 10.485(3)Å, b = 10.3956(18)Å, c = 14.1343(10)Å, β = 105.200(13)°, Z = 2 and refined to an R factor of 0.046. The trans isomer crystallizes in the monoclinic space group P21/c with a = 10.7217(12)Å, b = 5.6797(7)Å, c = 25.415(5)Å, β = 96.001(12)°, Z = 2 and refined to an R factor of 0.043. In the cis structure each benzene ring faces a cyclohexane ring while in the trans structure the cyclohexane rings face one another.
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  • 6
    ISSN: 1572-9451
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Notes: Abstract The Extended Tree Knapsack Problem (ETKP) is a generalized version of the Tree Knapsack Problem where an arbitrary nonlinear traffic‐flow cost is imposed. This problem can be solved by the straight‐forward “bottom‐up” approach with a time complexity of O(nH 2), where n is the number of nodes in the tree, and H is the knapsack capacity. In this paper, we show that if the traffic‐flow cost function is the cable expansion cost, which occurs in the Local Access Telecommunication Network (LATN) expansion, this special ETKP can be solved by a depth‐first dynamic programming procedure in a time complexity of O(nδH), where δ is the largest existing cable capacity in LATN. This result indicates that the depth‐first dynamic programming algorithm can be applied for solving a general class of tree optimization problems. The computational results of our algorithm for the ETKP are also provided.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Annals of operations research 87 (1999), S. 363-382 
    ISSN: 1572-9338
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Economics
    Notes: Abstract In this paper, we show that several well‐known facility location problems on trees, including the Uncapacitated Facility Location Problem (UFLP), the Facility Constrained Covering Problem (FCCP), the Customer Constrained Covering Problem (CCCP), theRound‐Trip Covering Problem (RTCP), the p‐Center Problem, and the p‐Median Problem, can be formulated uniformly into a special structured Tree Partitioning Problem (TPP). Then, we develop a generic algorithm to solve all these facility location problems. Although our algorithm is a generic one, our time complexity for solving each of these problems matches the best time complexity of the “dedicated” algorithm. We believe our approach has shown much insight into the location problems on trees.
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    International journal of flexible manufacturing systems 10 (1998), S. 195-196 
    ISSN: 1572-9370
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    International journal of flexible manufacturing systems 10 (1998), S. 197-229 
    ISSN: 1572-9370
    Keywords: order fulfillment process ; supply chain networks ; multiagent information system ; business process reengineering
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract An order fulfillment process (OFP) starts with receiving orders from customers and ends with delivering the finished goods. The order fulfillment process is complex because it is composed of several activities, executed by different functional entities, and heavily interdependent among the tasks, resources, and agents involved in the process. A supply chain network (SCN) is a network of autonomous or semi-autonomous business entities involved, through upstream and downstream links, in the different processes and activities that produce goods or services to customers. As manufacturing practice shifts toward the outsourcing paradigm, the OFP is more likely to be executed throughout SCNs. It becomes imperative to integrate the OFP into SCNs to improve the OFP. Generalizing from the variety and complexity of SCNs, this study identifies several main types of SCN structures and addresses OFP issues based on them. The objective of reengineering the OFP is to achieve agility in the process in terms of efficiency, flexibility, robustness, and adaptability. We propose a multiagent information system (MAIS) approach for reengineering the OFP in SCNs. The MAIS models the OFP in SCNs and evaluates OFP performance by applying the proposed strategies. A multiagent simulation platform, called Swarm, is enhanced and applied for modeling the MAIS; and experiments are conducted to simulate the OFP and then evaluate the potential improvement strategies to identify useful strategies for improving the OFP. The strategies we evaluated include (1) coordinating demand management policies, (2) information sharing strategies, (3) synchronizing material and capacity availability, (4) dynamic resource allocation, and (5) the combination of various strategies. The results shed light on identifying the main effects of various strategies on OFP performance. The insights from utilizing various strategies in different SCNs help reengineer the OFP in SCNs.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Positivity 2 (1998), S. 281-299 
    ISSN: 1572-9281
    Keywords: n-times integrated C-cosine function ; hermitian C-cosine function ; positive C-cosine function
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract Peculiar properties of hermitian and positive n-times integrated C-cosine functions on Banach spaces are investigated. Among them are: (1) Any nondegenerate positiven -times integrated C-cosine function is infinitely differentiable in operator norm; (2) An exponentially bounded, nondegenerateC -cosine function on L p (μ) (1〈p〈∞) (orL 1(μ), C0 , in case C has dense range) is positive if and only if its generator is bounded, positive, and commutes with C.
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