Enhanced mechanical performance of CNT/Polymer composite yarns by γ-irradiation     

Jackie Y. Cai  Jie Min  Menghe Miao  Jeffrey S. Church  Jill McDonnell  Robert Knott  Stephen Hawkins  Chi Huynh 《Fibers and Polymers》2014,15(2):322-325

Multiwall carbon nanotube (CNT) spun yarns were subjected to γ-irradiation in an oxygen rich environment, followed by the application of epoxy to form CNT/epoxy composite yarns with a high CNT fraction. The method for fabrication of the CNT/polymer composite yarns was presented, and the effect of γ-irradiation on the mechanical performance of the pure CNT spun yarns and their epoxy composite yarns were studied. The γ-irradiated CNT yarns were also characterized by X-ray Photoelectron Spectroscopy and Raman spectroscopy. The results of this study have demonstrated that the γ-irradiation is an effective micro-engineering tool to improve mechanical properties of the CNT spun yarn and its epoxy composite yarn.  相似文献   

Soil CO2 emissions in cropland with fodder maize (Zea mays L.) with and without riparian buffer strips of differing vegetation     

Dlamini  J. C.  Cardenas  L. M.  Tesfamariam  E. H.  Dunn  R. M.  Evans  J.  Hawkins  J. M. B.  Blackwell  M. S. A.  Collins  A. L. 《Agroforestry Systems》2022,96(7):983-995

Agroforestry Systems - Vegetated land areas play a significant role in determining the fate of carbon (C) in the global C cycle. Riparian buffer vegetation is primarily implemented for water...  相似文献   

Foliar application of urea to potatoes     

E. Francis Button  Arthur Hawkins 《American Journal of Potato Research》1958,35(7):559-572

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INVESTIGATIONS ON LOCAL STRAINS OF HERBAGE PLANTS II. TYPES OF RED CLOVER AND THEIR IDENTIFICATION     

R. P. Hawkins 《Grass and Forage Science》1953,8(3):213-238

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Identification of AFLP Markers that Discriminate Between Cultivated Cotton and the Hawaiian Island Endemic, <Emphasis Type="Italic">Gossypium tomentosum</Emphasis>Nuttall ex Seeman     

J.?S.?Hawkins  J.?Pleasants  J.?F.?WendelEmail author 《Genetic Resources and Crop Evolution》2005,52(8):1069-1078

Interspecific gene flow from crop species into wild relatives may compromise the genetic integrity of native species and in the case of transgenic crops lead to the escape of transgenes into natural populations. Approximately 72% of the upland cotton (Gossypium hirsutum L.) acreage grown in the United States in 2000 utilized transgenic cultivars. The closest relative of G. hirsutum is G. tomentosum Nuttall ex Seeman, endemic to the Hawaiian archipelago. Because these two species are fully interfertile, cultivation of transgenic G. hirsutum in the Hawaiian Islands is restricted. We investigated the possibility of identifying AFLP genetic markers that are diagnostic for each species and thus could be used in future studies to detect introgression between them. In addition, we were interested in comparing levels and geographic patterns of AFLP diversity in G. tomentosum to previous estimates using allozyme data. AFLP analysis led to the detection of 11 and 16 species-specific markers for G. tomentosum and G. hirsutum, respectively. These species-specific AFLP markers will be useful for detecting gene flow between G. hirsutum and G. tomentosum that has occurred in the past and thus might occur in the future if the restrictions on cultivation of transgenic G. hirsutum are relaxed in the Hawaiian Islands. Little genetic diversity and limited geographic patterning were discovered using AFLP markers, consistent with data from previous allozyme studies.  相似文献   

Highlights of a half-century in potato production     

Arthur Hawkins 《American Journal of Potato Research》1957,34(1):25-29

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DOUGLAS-FIR SEEDLING RESPONSE TO A RANGE OF AMMONIUM: NITRATE RATIOS IN AEROPONIC CULTURE     

Kim T. Everett  B. J. Hawkins  A. K. Mitchell 《Journal of plant nutrition》2013,36(11):1638-1657

The objective of the experiment was to identify the most favorable nitrogen (N) source ratio of ammonium (NH₄ ⁺) and nitrate (NO₃ ^?) for aeroponically-grown Douglas-fir when pH was maintained at pH 4.0. Seedlings were grown in controlled environments with solutions containing 0:100, 20:80, 40:60, 60:40, 80:20 or 100:0 NH₄ ⁺:NO₃ ^? ratios. Nutrient additions in the aeroponic culture units were controlled by solution conductivity set points. Seedling growth and nutrient allocation was observed for 45 days. Different NH₄ ⁺:NO₃ ^? ratios resulted in significant differences in the rate of N addition, growth, morphology, and nutrient allocation. Seedlings grown in solutions containing 60 or 80% NO₃ ^? were characterized by a combination of high growth and photosynthetic rates, high and stable internal plant N concentrations, and sufficient levels of other essential nutrients. High proportions of NH₄ ⁺ in solution resulted in low rates of N addition, stunted lateral root growth, and may have been toxic.  相似文献   

Retrieval of Additional Epinephrine From Auto-Injectors     

Seth C. Hawkins  Carl Weil  Fred Baty  David Fitzpatrick  Bryan Rowell 《The Forestry Chronicle》2013,24(4):434-444

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Participation of Iatrogenically Coagulopathic Patients in Wilderness Activities     

Seth C. Hawkins  Michael J. Caudell  Thomas G. Deloughery  William Murray 《The Forestry Chronicle》2013,24(3):257-266

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Surgical treatment of urolithiasis in male horses     

J. F. Hawkins 《Equine Veterinary Education》2013,25(2):60-62

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