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  • 1
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    Unknown
    David A. Pyke to Viktor Hamburger, September 9, 1991 (2015)
    Marine Biological Laboratory (Woods Hole, Mass.) | Arizona Board of Regents
    In:  Viktor Hamburger collection, Box 2, Folder 29, P, 1939-1991, Marine Biological Laboratory Archives
    Details
    Publication Date: 2023-01-12
    Description: Letter
    Description: additional signatures on bottom of letter
    Description: Plans for visit
    Description: Correspondence
    Keywords: People
    Repository Name: Woods Hole Open Access Server
    Language: English
    Type: Text
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  • 2
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    David A. Pyke to Viktor Hamburger, July 11, 1991 (2015)
    Marine Biological Laboratory (Woods Hole, Mass.) | Arizona Board of Regents
    In:  Viktor Hamburger collection, Box 2, Folder 29, P, 1939-1991, Marine Biological Laboratory Archives
    Details
    Publication Date: 2023-01-12
    Description: Letter
    Description: additional signatures on bottom of letter
    Description: Would like to interview Hamburger for book on scientific and medical refugees
    Description: Correspondence
    Keywords: People
    Repository Name: Woods Hole Open Access Server
    Language: English
    Type: Text
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  • 3
    Electronic Resource
    Electronic Resource
    Establishing Native Grasses in a Big Sagebrush–Dominated Site: An Intermediate Restoration Step (2005)
    Oxford, UK; Malden, USA : Blackwell Science Inc
    Restoration ecology 13 (2005), S. 0 
    Details
    ISSN: 1526-100X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Many semiarid rangelands in the Great Basin, U.S.A., are shifting dominance to woody species as a consequence of land degradation including intense livestock grazing and fire suppression. Whereas past rehabilitation efforts in Big sagebrush (Artemisia tridentata) steppes removed the shrub and added introduced forage grasses to successfully shift communities from shrublands to grasslands, current consensus is that native species should be included in restoration projects and that retention of some woody plants is desirable. We examined the potential for interseeding grasses into dense shrub communities as a precursor to thinning shrubs and releasing grasses from shrub interference. We compared seedling establishment of the native grass, Bluebunch wheatgrass (Pseudoroegneria spicata), with that of the Eurasia grass, Crested wheatgrass (Agropyron desertorum), in dense Ar. tridentata stands. Shrubs may play an important role as nurse plants for seedling establishment (reduced solar radiation, “island of fertility” effect) but result in highly contrasting light environments and root interference for seedlings. In experimental plots, we examined effects of Ar. tridentata shade levels (0, 40, 70, and 90% reduction of solar radiation) and initial root exclusion (present/absent) on the establishment and growth of P. spicata and Ag. desertorum seedlings. With this design we evaluated the interference effects of Ar. tridentata on the two grasses and identified the most beneficial microsites for grass restoration in Ar. tridentata–dominated communities. We predicted seedling survival and growth to be greater under moderate shade (40% reduction) and limited root competition than under no or strong shade conditions (0 and 90%) and unrestricted root interactions. Fifty to 85% of the P. spicata and Ag. desertorum seedlings survived the dry summer months of 1995 and 1996 and the intervening winter. Neither shading nor root exclusion from Ar. tridentata affected final seedling survival of either species. Seedling biomass of both grass species was negatively affected by initial root interactions with Ar. tridentata. However, the analysis of seedling biomass variability (coefficient of variation) indicated that in all shade and root-exclusion treatments, some seedlings of both species developed to large individuals to survive in Ar. tridentata–dominated rangelands. Thus, the use of interseeding techniques shows promise for restoring herbaceous species in dense Ar. tridentata stands and should be given further consideration when shrub retention is an important consideration.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1526-100X.2005.00037.x
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  • 4
    Electronic Resource
    Electronic Resource
    Solution Procedures for the Lot-Streaming Problem (1990)
    Oxford, UK : Blackwell Publishing Ltd
    Decision sciences 21 (1990), S. 0 
    Details
    ISSN: 1540-5915
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Economics
    Notes: Lot streaming is the process of splitting a job into sublots so its operations can be overlapped and its progress accelerated. We present a computationally efficient procedure for solving the m-machine, two-sublot problem, and we discuss the bottleneck insights that emerge from the analysis. We also examine heuristic approaches for more than two sublots and discuss computational results for these procedures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1540-5915.1990.tb00328.x
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  • 5
    Electronic Resource
    Electronic Resource
    Restoring Forbs for Sage Grouse Habitat: Fire, Microsites, and Establishment Methods (2003)
    Boston, MA, USA : Blackwell Science Inc
    Restoration ecology 11 (2003), S. 0 
    Details
    ISSN: 1526-100X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract The decline and range reduction of sage grouse populations are primarily due to permanent loss and degradation of sagebrush–grassland habitat. Several studies have shown that sage grouse productivity may be limited by the availability of certain preferred highly nutritious forb species that have also declined within sagebrush ecosystems of the Intermountain West, U.S.A. The purpose of this study was to determine the suitability of three species of forbs for revegetation projects where improving sage grouse habitat is a goal. Species suitability was determined by evaluating the emergence, survival, and reproduction of Crepis modocensis, C. occidentalis, and Astragalus purshii in response to method of establishment (seeding or transplanting), site preparation treatment (burned or unburned), and microsite (mound or interspace) in an Artemisia tridentata ssp. wyomingensis vegetation association in south central Oregon. For seeded plants A. purshii had the lowest emergence (8%) of all three species. Both seeded Crepis species had similar overall emergence (38%). Significantly more Crepis seedlings emerged from shrub mounds in unburned areas (50%) than in any other fire-by-microsite treatment (33 to 36%). Approximately 10% more Crepis seedlings survived in mounds compared with interspaces. Nearly twice as many emerging Crepis seedlings survived in the burned areas as opposed to unburned areas (p 〈 0.01). This resulted in more plant establishment in burned mounds despite higher emergence in unburned mounds. Astragalus purshii seedlings also survived better in burned areas (p = 0.06) but had no differential response to microsite. Fire enhanced survival of both Crepis and A. purshii transplants (p = 0.08 and p = 0.001). We believe additional research is needed to improve A. purshii emergence before it will become an effective plant for restoring sage grouse habitat. Conversely, we conclude that these Crepis species provide a viable revegetation option for improving sage grouse habitat in south central Oregon.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1526-100X.2003.00159.x
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  • 6
    Electronic Resource
    Electronic Resource
    Attendant problem (1989)
    [s.l.] : Nature Publishing Group
    Nature 339 (1989), S. 248-248 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SIR-In his delightful review of the second edition of the Oxford English Dictionary (Nature 338, 385; 1989), Stephen Jay Gould discusses the word 'scientist'. He writes of 'attendees' at the meeting of the British Association in 1834 at which the word was first suggested. Has he not confused active ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/339248e0
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  • 7
    Electronic Resource
    Electronic Resource
    Impact of early root competition on fitness components of four semiarid species (1990)
    Springer
    Oecologia 85 (1990), S. 159-166 
    Details
    ISSN: 1432-1939
    Keywords: Root competition ; Seedling survival ; Seedling height ; Seed production ; Semiarid ecosystem
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Plant demographic and root exclusion approaches were used to examine the influence of roots of adult Artemisia tridentata, Agropyron desertorum, and Agropyron spicatum individuals on seedling survival of four C3 semiarid species, three perennials, Ar. tridentata, Ag. desertorum, Ag. spicatum, and an annual, Bromus tectorum. Furthermore, height of Ar. tridentata seedlings and seed production of B. tectorum were assessed. The probability of a seedling being alive significantly depended on the seedling species, the neighboring adult species, and on the depth to which root competition was excluded. As seedlings, survival of Agropyron species did not differ, whereas survival of Ar. tridentata seedlings was higher than Ag. desertorum and was similar to Ag. spicatum. Bromus tectorum maintained significantly higher survival rates than perennial seedlings. Established individuals of Ar. tridentata reduced seedling survival more than established individuals of either Agropyron species. Seedling survival significantly increased with greater depth of root exclusion for the perennials but did not significantly affect seedling survival of B. tectorum. Height of Ar. tridentata seedlings and seed production of B. tectorum significantly increased with depth of root exclusion. Seed production of B. tectorum was highest when competing with Ag. desertorum and was lowest with Ar. tridentata. Root competition decreased the seed population of B. tectorum in the next generation even though it had no impact on survival. Competition in the upper soil horizon occurs between seedlings and established adults early in the growing season and potentially restricts root growth of seedlings. In arid and semiarid ecosystems, soil moisture is depleted from the upper horizons first, resulting in the death of seedlings that do not have access to moisture.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00319397
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  • 8
    Electronic Resource
    Electronic Resource
    Comparative demography of co-occurring introduced and native tussock grasses: persistence and potential expansion (1990)
    Springer
    Oecologia 82 (1990), S. 537-543 
    Details
    ISSN: 1432-1939
    Keywords: Agropyron desertorum ; Agropyron spicatum ; Demography ; Plant introductions ; Seed predation ; Seed bank ; Seedling survival ; Tussock grass
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Demographic characteristics associated with the maintenance and growth of populations, such as seed dynamics, seedling emergence, survival, and tiller dynamics were examined for two tussock grasses, the native Agropyron spicatum and the introduced Agropyron desertorum in a 30-month field study. The introduced grass was aerially sown onto a native grassland site. Seed production of the introduced grass was greater than the native grass in both above- and below-average precipitation years. Seeds of A. spicatum were dispersed when they mature, while A. desertorum retained some seeds in inflorescences, and dispersed them slowly throughout the year. This seed retention allowed some seeds of the introduced grass to escape peak periods of seed predation during the summer and allowed seeds to be deposited constantly into the seed bank. Carryover of seeds in the seed bank beyond one year occurred in the introduced grass but not in the native species. For both species, seedling emergence occurred in both autumn or spring. Survival rates for A. desertorum were higher than A. spicatum when seedlings emerged between November and March. Survival rates of cohorts emerging before November favored A. spicatum whereas survival rates did not differ between species for cohorts emerging after March. Individuals of both species emerging after April were unable to survive the summer drought. Demographic factors associated with seeds of A. desertorum seemed to favor the maintenance and spread of this introduced grass into native stands formerly dominated by A. spicatum.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00319798
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  • 9
    Electronic Resource
    Electronic Resource
    Buffering unbalanced assembly systems (1997)
    Springer
    IIE transactions 30 (1997), S. 55-65 
    Details
    ISSN: 1573-9724
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Many assembly systems are required to hold minimal work-in-process inventories because of space or capital limitations. Unfortunately, in the presence of variable processing times, output from an assembly line may be severely restricted if no work-in-process inventory is held. Thus, assembly lines often should be designed to have minimal, but not zero, buffer capacity. In this paper we address the issue of how one should optimally deploy limited buffer capacity in unbalanced assembly systems, and we find that the answer is sometimes counterintuitive. We study simple asynchronous assembly systems with random processing times and develop simple heuristic rules that can be used to improve existing operations and to support line designers who are faced with increasingly rapid cycles of new product introduction. We apply these heuristics to several larger systems and discover that they perform quite well.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007493512502
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  • 10
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    On the impact of jet fuel cost on airlines’ capacity choice: Evidence from the U.S. domestic markets (2018)
    Elsevier
    Details
    Publication Date: 2018-03-01
    Print ISSN: 1366-5545
    Electronic ISSN: 1878-5794
    Topics: Architecture, Civil Engineering, Surveying , Geography , Economics
    Published by Elsevier
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