Results 31 to 40 of about 69,697 (199)

Wild Pigs (Sus scrofa) Stand Their Ground: Investigating Flight Response, or Lack Thereof, to Perceived Predation Risk 野猪坚守原地:探究其面对感知捕食风险时的逃逸反应 (或无逃逸行为)

open access: yesWildlife Letters, EarlyView.
We used automated behavioral response systems (ABRs) to assess invasive wild pig (Sus scrofa) behavioral response to four auditory playbacks: humans, coyote vocalizations (Canis latrans), pigs in distress, and barred owl (Strix varia) calls. Wild pigs had a significant flight response to human playbacks, but 68% of pigs did not flee.
Justine L. Smith   +2 more
wiley   +1 more source

电子辐照原位研究超细颗粒石墨的微观结构演变

open access: yesHe jishu
石墨在熔盐堆中作为慢化剂和结构材料,长期受到高温和高通量的快中子辐照,内部产生大量点缺陷,这些缺陷会湮灭、扩散或团聚形成大的位错结构,改变石墨的微观结构,进而改变其宏观性能。然而,目前缺乏对其缺陷演化过程的统一认识。因此,研究核石墨在高温能量粒子辐照下的缺陷演化和微观结构变化具有重要意义。本文采用200 keV的电子束在室温至750 ℃下对NG-CT-50超细颗粒核石墨进行了原位电子辐照实验,在高分辨透射电子显微镜中观察其微观结构的动态变化和位错的演化过程。研究发现 ...
孙 义军, 汪 雪, 周 兴泰
doaj   +1 more source

长期禁食对尿酸代谢的影响及其调控机制探讨

open access: yesKongjian kexue xuebao, 2023
为研究长期禁食过程中大鼠尿酸代谢的变化及其潜在的调控机制,以Sprague-Dawley(SD)大鼠为动物模型,通过病理组织切片、生化检测、荧光定量PCR(qRT-PCR)以及蛋白免疫印迹(Western blotting)等方法分析不同禁食时间(1,2,3,5,7天)大鼠尿酸水平及其代谢相关基因和蛋白的表达变化。结果表明,长期禁食未对大鼠肾脏组织产生明显的损伤,引起了血尿酸水平上升、尿尿酸水平波动性变化和血液尿酸酶活性升高;随着禁食时间的延长,主要尿酸转运蛋白的mRNA和蛋白表达水平逐渐上调 ...
隋 修锟   +9 more
doaj   +1 more source

Context‐Dependent Effects of Beavers (Castor spp.) on Freshwater Pearl Mussels (Margaritifera margaritifera) in European Rivers 河狸对欧洲河流中的淡水珍珠贝 (Margaritifera margaritifera) 存在情境依赖性影响

open access: yesWildlife Letters, EarlyView.
The study explores how beavers (Castor spp.) affect endangered freshwater pearl mussels (Margaritifera margaritifera) in European rivers. Beaver dams can harm small, fragmented mussel populations by reducing flow, increasing sediment, and potentially limiting host fish movement, while larger populations may benefit from improved bed stability and ...
Louise Lavictoire   +2 more
wiley   +1 more source

Flavor Characteristics of Chinese Whisky(中国威士忌的风味特征) [PDF]

open access: yesShipin kexue jishu xuebao
Chinese whisky gradually established a regionally distinctive flavor profile by innovating in local raw materials, yeast strains, oak barrel selection, and storage techniques while inheriting traditional craftsmanship.
FENG Tao(冯涛), MA Chenwei(马辰玮)
doaj   +1 more source

基于联盟链的去中心化能源交易系统 [PDF]

open access: yes全球能源互联网, 2019
随着分布式能源的快速发展,传统的中心化能源交易系统遇到了建造和维护中心化数据库的成本较高、数据被篡改后会酿成严重后果和难以保障用户隐私这三大问题。针对这些问题,设计了一种基于联盟链的去中心化能源交易系统。首先,分析了该系统的组成部分,利用联盟链的准入机制对用户进行监管。介绍了该系统的交易流程,包括网络节点的配置,使用数字证书注册管理员和用户,借鉴链上链下协同架构实现分布式交易撮合等。接着,介绍了该系统使用的分布式交易撮合算法。然后,利用Hyperledger Fabric平台研发了该系统 ...
周鑫, 邓莉荣, 王彬, 潘昭光
doaj   +1 more source

Scaling from microsite to landscape to resolve litter decomposition dynamics in globally extensive drylands

open access: yesFunctional Ecology, EarlyView.
Read the free Plain Language Summary for this article on the Journal blog. Abstract Decomposition is the transformation of dead organic matter into its inorganic constituents. In most biomes, decomposition rates can be accurately predicted with simple mathematical models, but these models have long under‐predicted decomposition in globally extensive ...
Heather L. Throop   +8 more
wiley   +1 more source

月球表面热管熔盐堆概念设计

open access: yesHe jishu
在月球建立基地是人类探索太空的第一步,而为基地提供稳定可靠的能源是最重要的方面之一。与太阳能相比,核能具有高功率、比质量低、使用寿命长、可全天候供电等优点,是月球表面基地能源供给的理想选择。基于100 kWe的供电需求,设计了月球表面热管熔盐堆。使用SCALE 6.1开展了中子物理与屏蔽分析。基于热管的黏性极限、声速极限、携带极限、沸腾极限和毛细极限,采用热阻网络法模拟热管传热,并耦合计算流体力学方法进行了正常工况下全堆芯热工流体分析。分析结果表明:通过三分区堆芯布置可以展平功率 ...
刘 坤   +5 more
doaj   +1 more source

Ecohydrological characteristics of biocrusts explain divergent responses of biocrusts and grasses to rainfall reduction

open access: yesFunctional Ecology, EarlyView.
Read the free Plain Language Summary for this article on the Journal blog. Abstract Drylands are mainly structured by both vascular plants and biological soil crusts (biocrusts), the latter often regarded as a self‐organizing component of these ecosystems.
Haoran Luo   +13 more
wiley   +1 more source

辐射诱导有机-无机杂化材料的制备与性能研究进展

open access: yesFushe yanjiu yu fushe gongyi xuebao
有机-无机杂化材料通过有机与无机组分的协同作用克服了单一材料的性能局限,实现了材料的高性能化和多功能化,但在制备过程中仍存在组分混合不均、孔隙率下降及相容性差等难题。辐射诱导技术通过调控能量传递与反应路径,为解决这些问题提供了有效途径。本文综述了辐射诱导法制备有机-无机杂化材料的研究进展:直接法利用γ射线、电子束等辐射源激发活性粒子(自由基、离子),驱动化学键重组,实现常温常压下快速合成,如Ag/PVA(聚乙烯醇)杂化水凝胶的绿色制备及ZIF-8@ZnO异质结构的光催化性能提升 ...
郭 正纲   +8 more
doaj   +1 more source

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