Results 51 to 60 of about 1,050 (155)
, 1999 将甲壳素的结构与纤维素进行了比较， 并根据结构和链刚性指出其形成液晶态的可能性。简要介绍了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。叙述了１５ 种甲壳素衍生物的溶致液晶行为以及结构因素对它们液晶临界行为的影响。介绍了甲壳素衍生物形成的主要液晶态织构， 如指纹状织构、交替偏振场织构、条带织构和滴状织构，以及甲壳素衍生物／二氯乙酸溶液的热致相转变 ...
汪剑炜, 董炎明, 袁清
core
Changes in Key Biodiversity Area networks following national comprehensive assessments
Conservation Biology, Volume 40, Issue 1, February 2026.Making comprehensive assessments of Key Biodiversity Area (KBA) networks in a country greatly increases their number and area. Countries that have not yet done so will be missing about half of these globally significant sites and missing the opportunity to get 30 × 30 conservation in the right places. Abstract Key Biodiversity Areas (KBAs) are sites of
Andrew J. Plumptre +46 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
, 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
core
Structural Characterization of a Water-Soluble Polysaccharide from Lycium ruthenicum Murr. Fruits and Its Protective Effect on Ethanol-Induced Damage in GES-1 Cells [PDF]
Lycium ruthenicum Murr. polysaccharide (LRMP) was obtained by hot water extraction, its structural parameters such as monosaccharide composition, glycosidic linkages and chain conformation were analyzed, and its protective effect on ethanol ...
QIAN Rong, AN Jiaxin, XU Xiaoqi, ZHANG Tao, CHEN Aijun, LI Sha, XU Hong
core +1 more source
Vulnerability of tropical fish communities across depth in the central Indian Ocean
Conservation Biology, Volume 39, Issue 6, December 2025.Abstract Coral reefs and their fish communities below scuba diving depth (>30 m), in mesophotic coral ecosystems (MCEs) (∼30–150 m), in rariphotic (150–300 m), and in upper bathyal waters (300–500 m) are often underexplored, especially in the Indian Ocean.
Paris V. Stefanoudis +12 more
wiley +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
core
Evaluating protected areas’ coverage of threats to terrestrial biodiversity
Conservation Biology, Volume 39, Issue 6, December 2025.Abstract Protected areas (PAs) are vital for biodiversity conservation and have expanded globally. However, increasing pressures on biodiversity make it difficult to achieve conservation goals. Using threat probability maps based on the International Union for Conservation of Nature Red List and the World Database of Protected Areas, we analyzed the ...
Katherine Pulido‐Chadid +2 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
doaj
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