Results 141 to 150 of about 621,014 (218)
Review of Policy Research, Volume 43, Issue 6, November 2026.ABSTRACT The EU policy framework for nature restoration has undergone a significant change with the adoption of the Nature Restoration Regulation. Since 2022, the EU has developed a new comprehensive and continent‐wide legislation to restore degraded ecosystems and halt biodiversity loss, which came into force in August 2024 and is an integral part of ...
Ronit Justo‐Hanani
wiley +1 more source
Gaoya dianqi, 2015 500 kV变压器是变电站的核心元件,套管对主变的稳定运行有着重要的作用,根据公司关于500 kV高压交流套管反事故措施的要求,基于套管在线监测系统对主变变高、变中套管的运行情况进行实时监测,发现500 kV 1号主变变高侧B相套管介损值增长明显,增长幅度较大,电容值变化无异常。为验证在线监测数据的准确性,针对10 kV常规介损测试难以真实反映套管真实运行状况的情况,采用变频原理的串联谐振升压方式对主变套管进行高压介损测试,发现B相变高套管介损值随电压升高,介损值上升趋势明显,在某个区间有突变情况 ...
董玉玺, 解德英, 曾力, 谢兵平
doaj
Review of Policy Research, Volume 43, Issue 6, November 2026.ABSTRACT Nature conservation conflicts increasingly extend beyond ecological objectives to disputes over decision‐making legitimacy, institutional authority, and competing understandings of landscape and expertise. This article examines the conflict over the proposed designation of Křivoklátsko as a national park in the Czech Republic between 2021 and ...
Filip Simon
wiley +1 more source
四川大学学报. 自然科学版, 2008 针对低照度岩心荧光图像拼接问题,通过相位相关法,利用频域中的相位信息来实现图像的拼接.对有位移、旋转、缩放,以及光照变化的图像用对数极坐标相位相关法进行图像配准.实验表明该方法能够有效地克服图像间光照变化和CCD镜头造成的几何畸变对拼接的影响,是一种有效的岩心荧光图像拼接方法.
姜元山 +3 more
doaj
Rare Metals, Volume 45, Issue 10, October 2026.ABSTRACT To improve the strength–toughness balance of IN718, and alleviate the brittleness commonly associated with refractory high‐entropy alloys, this study proposes a novel strategy to fabricate defect‐free IN718/WMoTaNb heterogeneous multiprincipal element alloy coatings via laser‐directed energy deposition.
Zhao Wang +7 more
wiley +1 more source
, 2015 本发明公开一种含水合物相变的固-液-气多相流动实验装置与测试方法，包括水合物沉积物颗粒粉碎机、混合仓、回收仓、混合物提升管道、气液固多相竖直输送管道、水力注入系统、测试系统和控制处理系统。本发明可以实验模拟水合物沉积物固体颗粒和热水的混合物由管道向上输送的物理过程，又能够测试水合物相变规律、气/液/固流动特征、多组分分离参数等，为水合物开采提供科学依据和技术支持。本发明在水合物开采方面提供新的实验系统和测试技术，在传热传质 ...
鲁晓兵, 张旭辉
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Guangtongxin yanjiu, 2003 利用光脉冲在光纤中传播时所遵守的相干非线性薛定谔耦合方程,研究了线偏振光在双折射色散缓变光纤中的传输特性.结果表明,线性双折射、非线性效应和色散的相互作用,使光的偏振状态发生变化,产生交叉相位调制（XPM）,从而导致相位匹配参量的四波混频.这一过程不仅在反常色散区产生,在正常色散区也能产生,并且当传输距离发生变化时,也随之发生变化.
贾维国, 杨性愉
doaj
, 2016 对不同锆锡比的Pb_(0.97)La_(0.02)(Zr_(0.12+x)Sn_(0.7-x)Ti_(0.18))O_3铁电陶瓷的铁电和相变行为进行了系统的研究,阐明了组成和温度对PLZST铁电陶瓷的相变效应的影响规律.研究结果表明:PLZST铁电陶瓷均呈现典型的铁电体电滞回线.随着温度的升高,PLZST12/70/18,PLZST52/30/18,PLZST62/20/18发生铁电-顺电相变,PLZST22/60/18,PLZST32/50/18,PLZST42/40/18为铁电-反铁电-顺电相变.
曾涛 +4 more
core
Rare Metals, Volume 45, Issue 10, October 2026.ABSTRACT The deformation behavior of NiTiNb shape memory alloys is governed by microstructural heterogeneity, specifically the interconnected topology of the β‐Nb phase. The regulatory role of the eutectic structure in load partitioning and the evolution of deformation mechanisms, particularly in high‐Nb systems, has not been clearly understood.
Qingda Zhang +11 more
wiley +1 more source
[Spliceosome defects and neurodevelopmental disorders]. [PDF]
Zhongguo Dang Dai Er Ke Za ZhiHuang XZ, Chen H, Chen RM.
europepmc +1 more source