Results 41 to 50 of about 1,217 (166)
Using online reports of seahorse seizures to track their illegal trade
Conservation Biology, Volume 39, Issue 5, October 2025.Abstract Illegal wildlife trade (IWT) is a persistent and extensive threat to global biodiversity. Hundreds of marine fish species are subject to regulation under the Convention on International Trade in Endangered Species of Wild Fauna and Flora (CITES), but it is unclear how much protection species gain from CITES because information on marine fish ...
Sarah J. Foster +3 more
wiley +1 more source
The configurational transition of polyelectrolyte chain confined in a cylinder(聚电解质链在柱状受限下的构象转变)
Zhejiang Daxue xuebao. Lixue ban, 2023 采用粗粒化分子动力学模拟方法，研究了受限于圆柱体内的聚电解质链的构象行为。通过计算链平均回旋半径、平均持久长度和平均形状因子等物理量，重点探究反离子价态、链刚性和受限孔径等对聚电解质链尺寸和构象转变的影响。结果表明，受限聚电解质链可形成稳定的棒状、球状、折叠链状和环状结构。尤其在三价反离子诱导下，半刚性聚电解质链可形成稳定的环状结构，并由切向相关函数表征。通过统计反离子分布，进一步探讨了聚电解质链和离子凝结的机制。同时讨论了环的成核和生长动力学特征 ...
高菊先(GAO Juxian) +2 more
doaj +1 more source
我国房地产行业发展轨迹的数据观察与预测——基于经济预测的理论方法的应用 [PDF]
, 2009 近年来,恐怕没有哪个行业会向房地产行业这样吸引如此多的社会关注,从07年的一路走高到08年受金融海啸波及的萧瑟低迷,再到09年一季度的回暖苗头,其曲折的发展道路引得各种论调扑面而来,难辨真假。本文旨在运用经济预测与决策及时间序列分析学到的理论知识,在这个纷繁复杂的论战中通过自己的分析 ...
岑希
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A global indicator of species recovery
Conservation Biology, Volume 39, Issue 5, October 2025.Abstract Monitoring progress toward meeting global biodiversity goals involves several indicators, including, at the species level, the International Union for Conservation of Nature (IUCN) Red List Index (RLI) and the Living Planet Index (LPI). However, at present, there is no indicator specifically for tracking species recovery, despite this being ...
H. Resit Akçakaya +4 more
wiley +1 more source
Time-Frequency Analysis of Air-coupled GPR Data for Identification of Delamination between Pavement Layers [PDF]
, 2017 随着国家对交通基础设施的投入加大，全国高速公路的里程数日益增加，随之而来的道路工程问题也日益扩大，造成严重的社会影响和经济损失。探地雷达作为一种高性能的无损检测工具，不仅在工程勘探结果上直观准确，而且操作简便高效，在公路病害无损检测中已经得到广泛应用。然而，受限于探地雷达的工作带宽，在一些数值上需要精确测量的工程问题方面，探地雷达的分辨率仍然无法满足要求。 本文主要关注高速公路沥青面层与混凝土基层之间的剥离问题，利用时频分析工具对不同厚度薄层的雷达反射复合波频谱特性进行研究 ...
邓志豪
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Mechanical Properties of Gangue-steel Slag-ore Powder Mixture [PDF]
In order to explore the mechanical properties of the coal gangue-steel slag-ore powder mixture without alkali initiator, the solid waste materials coal gangue, steel slag and mineral powder produced in Handan Area were taken as the research objects, and ...
Hanlong CUI +4 more
core +1 more source
Community‐informed and codesigned research to understand the impacts of railways on wildlife
Conservation Biology, Volume 39, Issue 5, October 2025.Abstract Trains cause mortalities of several animal species, but the ecological impacts of railways are understudied. Most research on wildlife–train collisions has focused on large mammals, but understanding railway‐specific risks for underrepresented taxa, especially vulnerable species, is important for developing effective mitigation strategies ...
Kyle D. Vincent +5 more
wiley +1 more source
, 1999 讨论了生物高分子甲壳素及其衍生物形成液晶态的基本结构条件。简要介绍了为制备液晶性甲壳素衍生物所必须的一些主要的化学修饰途径。综述了十几年来甲壳素衍生物（主要是壳聚糖及其衍生物）液晶性的研究进展。介绍了甲壳素及其衍生物的液晶纺丝及其应用前景 ...
董炎明, 袁清
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Veterinary Dermatology, Volume 36, Issue 2, Page 148-158, April 2025.Background – Biofilm production by canine otitis externa (COE) pathogens and resistance development to multiple antimicrobials are commonly reported problems in veterinary practice. The use of adjuvants to disrupt biofilms may be a viable adjunctive therapy.
Bhumika F. Savaliya +3 more
wiley +1 more source
Jianzhu Gangjiegou Jinzhan, 2021 对采用钢板攻丝高强螺栓连接的钢框架节点分别进行了高强螺栓拉伸及剪切试验、钢柱法兰连接节点静力及拟静力试验、梁柱半刚性连接静力试验。基于试验数据对节点连接的承载能力、失效模式以及刚度特征等关键问题进行了分析。研究结果表明:由自攻螺纹钢板及高强螺栓构成的连接形式具有良好的抗拉、抗剪性能,以螺杆断裂为最终破坏模式;钢柱法兰连接中法兰板无明显滑移及翘曲,高强螺栓没有拔出或断裂,试件表现出较好的延性和承载能力;梁柱连接表现出典型半刚性特征,桁架梁先于节点域发生破坏,破坏特征为桁架弦杆屈服及斜腹杆屈曲,节点连接符合"
贾斌 +4 more
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