Results 41 to 50 of about 2,860 (166)
Integrative Conservation, Volume 3, Issue 4, Page 312-329, December 2024.Biosphere reserves aim to protect global biodiversity alongside social and economic development. In the Cape Floristic Region, biosphere reserves are an effective conservation approach to protect arthropods against habitat transformation in this biodiverse region.
Michael J. Samways +3 more
wiley +1 more source
Rare-earth element carburization The new development of the caburization technology
Jixie chuandong, 1996 渗碳过程中，稀土具有催渗和微合金化双重作用。加稀土可使渗碳速度提高３０％。即使渗碳温度降低为８６０Ｃ－８８０Ｃ时，也可使渗碳周期与原工艺相当．加稀土高浓度渗碳后渗层中的碳化物为细小、弥散分布的颗粒状碳化物，渗层基体组织为板条马氏体＋细片状马氏体．过共折层的晶粒度显著细化，机械性能大幅度提高．
朱法义, 闫牧夫, 刘志儒
doaj
, 2003 The Yirba (128 km) pluton is an early Paleozoic dioritic intrusion of western Kunlun orogenic belt, northwest China as an important element when reconstructing the evolution history of this belt.
Hou, QL +5 more
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Topical and transdermal botanical formulations of the Chinese pharmacopoeia—A review
Phytotherapy Research, Volume 38, Issue 9, Page 4716-4735, September 2024.Abstract In pharmaceutics, ingredients are classified as active ingredients and excipients. In topical/transdermal phytomedicines, an ingredient may serve both functions. Published information on these dual‐purpose ingredients and their pharmacological relevance is limited.
Jingyi Gu +3 more
wiley +1 more source
Studies of Nd:YAG laser using a Fabry-Perot band-pass filter as output mirror [PDF]
, 2015 Nd:YAG晶体因为优越的光学性能和机械性能而得到最广泛的使用。室温下Nd:YAG晶体4F3/2—4I11/2能级跃迁产生的荧光谱线有多个发射峰。本文主要研究了以Fabry-Perot带通滤光片(FPF)作为[111]切割Nd:YAG激光器的输出镜，得到小受激发射截面激光的输出。实验结果获得了1123nm线偏振激光和1074nm激光输出，采用[100］切割Cr^(4+):YAG调Q晶体，获得了对应的脉冲激光输出，研究了被动调Q晶体方位对激光输出特性的影响；总结了作为固体激光器输出镜的Fabry ...
王忠发
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CAAI Transactions on Intelligence Technology, Volume 9, Issue 4, Page 960-972, August 2024.Abstract Sentiment analysis is a fine‐grained analysis task that aims to identify the sentiment polarity of a specified sentence. Existing methods in Chinese sentiment analysis tasks only consider sentiment features from a single pole and scale and thus cannot fully exploit and utilise sentiment feature information, making their performance less than ...
Jing Li +4 more
wiley +1 more source
稀土氧化物对ZnO-Bi2O3系压敏陶瓷晶粒分布及电气性能的影响
Dianci bileiqi, 2008 研究了稀土氧化物Ce2O3、Gd2O3、La2O3、Y2O3对ZnO-Bi2O3系压敏陶瓷晶粒尺寸和电气性能的影响,结果表明,稀土氧化物可有效地抑制ZnO晶粒的生长,掺杂Ce2O3、Gd2O3、La2O3、Y2O3后,晶粒的主要分布分别为0～18μm、0～14μm、0～11μm、0～16μm;平均晶粒尺寸下降,其中掺杂Gd2O3后晶粒尺寸最小,为6.2μm。ZnO晶粒分布的标准方差明显下降,改善了晶粒尺寸分布的均匀性。掺杂稀土氧化物后,电位梯度显著提高,E1mA达到了427.5V/mm ...
李盛涛, 成鹏飞, 王玉平, 朱斌
doaj
Integrative Conservation, Volume 3, Issue 1, Page 76-86, March 2024.Jigme Dorji National Park is the exclusive refuge for the critically endangered Bhutan poppy in Bhutan and worldwide, confined to alpine screes in Tshophu, Tshophu base and Jichudrakey base in Soe gewog, Thimphu. The primary conservation threats to this species stem from harvesting, grazing and trampling by livestock, despite the majority of Bhutan ...
Pema Dendup +3 more
wiley +1 more source
Flexibility trade‐offs in conservation offsets
Conservation Biology, Volume 38, Issue 1, February 2024.Abstract Conservation offsets promise cost‐effective conservation of biodiversity, especially under economic and environmental change, because they represent a more flexible approach to biodiversity conservation, allowing for the economic development of ecologically valuable land provided that this development is offset by restoration of previously ...
Martin Drechsler
wiley +1 more source
Zhejiang Daxue xuebao. Lixue ban, 2003 考虑4f壳层未填满的稀土金属的s-f交换作用,利用Feynman图方法,讨论了传统的电子-声子耦合s-f交换作用和电子交换作用的影响,并定量估计了s-f交换作用与电子-电子交换作用对热导率和热电势的影响.
CHENLi(陈丽), LIHua(李华)
doaj +1 more source