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| 1 | Experimental and simulation optimization analysis of the Whipple shields against shaped charge显示文摘Occasionally,the Whipple shields are used for the protection of a space station and a satellite against the meteoroids and orbital debris.In the Whipple shields each layer of the shield depletes part of high speed projectile energy either by breaking the projectile or absorbing its energy.Similarly,this investigation uses the Whipple shields against the shaped charge to protect the light armour such as infantry fighting vehicles with a little modification in their design.The unsteady multiple interactions of shaped charge jet with the Whipple shield package against the steady homogeneous target is scrutinized to optimize the shield thickness.Simulations indicate that the shield thickness of 0.75 mm offers an optimum configuration against the shaped charge.Experiments also support this evidence. | G.Hussain A.Hameed I.Horsfall P.Barton A.Q.Malik | 2012 | Acta Mechanica Sinica2012，28，3： | 4 |
| 2 | Linking tree growth rate, damage repair, and susceptibility to a genus-specific pest infestation显示文摘Pest preference and subsequent susceptibility of a host individual is likely related to previous growth patterns in that host.Emerald ash borer(Agrilus planipennis Fairmaire)is a pestiferous beetle introduced to North America from Asia.While all species of ash are susceptible to attack,some individual trees appear to survive infestation.We selected ash trees in southeastern Michigan,collected cores and categorized trees as high tolerance to emerald ash borer attack(high overall health,low crown dieback),low tolerance(low overall health,high crown dieback)and intermediate tolerance(in-between the other categories).We artificially wounded trees and measured wound closure after 3 years.Ring width indices were not correlated between high and low tolerance trees.Regression slopes comparing growth and years were significantly different between the three tolerance categories,with high tolerance trees having the steepest slope.Wound closure was greatest in high tolerance trees.High tolerance trees demonstrating more rapid(steeper regression slope),consistent(lower variance),and effective(greater wound closure)growth.Those vigorously growing trees likely had more capacity to repair damage caused by emerald ash borer,leading to healthier trees in our categorization.Linking previous host growth patterns to health may have implications related to identifying individual trees potentially tolerant to attack. | Kayla N.Boyes Kathryn G.Hietala-Henschell Alexander P.Barton Andrew J.Storer Jordan M.Marshall | 2019 | Journal of Forestry Research2019，30，5： | 1 |
| 3 | 中国云南省的土壤侵蚀与保护显示文摘本文讨论了长江上游水源区云南境内土壤侵蚀的范围、程度和保持状况。长江发源于中国西部的青藏高原,横贯大陆西东,全长6380km,其源头位于地壳活动和地质不稳定的高原区,流域区是以水稻生产为主的、土地利用程度较高的农业主产区,所以,土壤侵蚀极其严重;随着三峡大坝的修建,土壤侵蚀产生泥沙淤积将降低水库的使用效率等问题,致使土壤保持成为该区必不可少的措施之一,土壤侵蚀问题正越来越受到关注。文章回顾了云南省的土壤保持工作,并以东川、寻甸为例,阐明了云南省的区域土壤保持措施。在云南农业大学农场正在进行的径流区实验被用于评估不同土壤保持措施的效果。试验选择种植当地的主要作物玉米(Zea mays),采取传统的栽培方法,在三个不同的坡度上,沿等高线种植和顺坡向下垂直种植等处理进行,试验地条件与生产上的坡耕地一致。1993~1996年的研究结果表明:一般情况下,沿等高线种植的地区,土壤侵蚀率较低,采取这种措施,平均侵蚀率为顺坡向种植的0.69;秸秆覆盖和沿等高线种植是比较有效的土壤保持措施。 | Micheal A.Fullen David J.Mitchell Andrew P.Barton Trevor J.Hocking 刘立光 吴伯志 郑毅 夏振远 | 1999 | 人类环境杂志1999，28，2： | 0 |
| 4 | 超声用于监护治疗病房的意义显示文摘有经验的医生掌握超声检查不仅对初筛诊断,而且对重症患者具有重要的价值。超声亦适合术后病人的检查,如严重外伤。超声检查不仅扩大了治疗的范围,且明显地方便了监护病房患者的诊断。 | W.Pichler H.Jantsch P.Barton W.Frank A.Maier G.Lechner 王天才 | 1991 | 放射学实践1991，6，1： | 0 |
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