Results 31 to 40 of about 39,766 (300)
Risk, Hazards &Crisis in Public Policy, EarlyView.Abstract Norway's oil sector faces significant security challenges due to rapid technological advancements and heightened geopolitical tensions, particularly concerning threats from Russian drones. The sector maintains a vigilant approach, continually monitoring and adapting to evolving threats.
Riana Steen, Tommy B. Hansen
wiley +1 more source
一级磁结构相变材料Mn0.6Fe0.4NiSi0.5Ge0.5和Ni50Mn34Co2Sn14的磁热效应与磁场的线性相关性
, 2019 磁熵变（△SM）与磁场（0H）的相关性已在很多二级相变材料中被研究并报道，但一级相变材料的磁热效应与磁场相关性还少有报道.本文在具有一级磁结构相变的Mn0.6Fe0.4NiSi0.5Ge0.5材料中研究发现△SM与0H存在线性相关性，并通过麦克斯韦关系式的数值分析详细讨论了这一线性相关性的来源.同时，进一步发现在低磁场时，△SM近似正比于0H的平方.该线性相关性同样在一级磁结构相变Ni50Mn34Co2Sn14材料中得到了印证.但由于一级磁弹相变LaFe11.7Si1.3材料相变温度具有更强的磁场依赖性，
张虎 +6 more
semanticscholar +1 more source
Risk, Hazards &Crisis in Public Policy, EarlyView.Abstract Near‐earth orbits are becoming congested because of a rapid growth in the number of satellites and space debris, which presents a real threat to the sustainable use of space and the safety of the Earth. Despite space scientists and public policymakers having been actively seeking solutions for decades, solving the problem has been put off ...
Anna Ya Ni +2 more
wiley +1 more source
Self-assembly of diblock copolymer in bulk and solution(两嵌段共聚物在本体及溶液中的自组装)
Zhejiang Daxue xuebao. Lixue ban, 2014 采用耗散粒子动力学(DPD)模拟方法对两嵌段共聚物AmBn在本体和溶液中的自组装行为进行了研究.在本体情况下，对环形和线形两嵌段共聚物AmBn的相行为进行了系统的对比分析，观察了体系的有序-无序相转变规律，以及具体构型的相周期.在亲B选择性溶剂情况下，保持体系的浓度不变，改变环形两嵌段共聚物的链长，观察到了一系列丰富的相结构，有球状、圆盘状、片状、空心柱状、空心球状等.
PANHongwei(潘洪伟) +2 more
doaj +1 more source
Wildlife Letters, EarlyView.The edge densities of cropland, developed land, and water bodies (panel a) predict the spatial probability of mammalian predation on wild turkeys (panel b) using Mahalanobis distance factor analysis in Quitman County, Mississippi, United States. The three habitat fragmentation variables are represented by three arrows, respectively.
Guiming Wang +2 more
wiley +1 more source
Macro-dimension effects and phase transformation ofNi-Mn based high temperature shape memory alloys [PDF]
, 2016 Ni-Mn基形状记忆合金是发现比较早的一种高温形状记忆合金，其具有从高温母相（B2）转变为低温四方马氏体的可逆马氏体转变过程。但是Ni-Mn基合金的多晶脆性极大且其形状记忆效应差，因此关于该体系的研究较少。本论文拟通过添加有利于γ相形成的元素（Cu、Co和Fe），促使合金在均质化处理后呈现塑性的fccγ相组织，其后再研究合金在加热和冷却过程中的相转变行为、微观组织结构和尺寸效应，以及在预变形下的高温形状记忆效应。 本文首先以Ni50Mn50为母合金，根据Cu、Co ...
刘玉鼎
core
Wildlife Letters, EarlyView.This graphical abstract illustrates the core message of the manuscript – that fostering a strong sense of environmental responsibility and national pride can serve as crucial tools in the protection of wildlife. At the center is a large tree symbolizing ecological balance, rooted in community values. Surrounding it are people of all ages holding hands,
Aishwarya Maheshwari +2 more
wiley +1 more source
World Medical &Health Policy, EarlyView.ABSTRACT Population aging impacts the utilization of health services, especially in Emergency Departments (EDs). A rising share of older adults in the US report ED use, especially frequent ED use, defined as ≥ 4 visits annually. Prior works have examined frequent utilization of EDs among geriatric populations, but no study has focused on age‐based ...
Uma Kelekar +5 more
wiley +1 more source
颗粒蛋白前体在神经系统疾病中的研究进展 Progress of Role of Progranulin in Nervous System Diseases
Zhongguo cuzhong zazhi, 2019 【摘要】 颗粒蛋白前体（progranulin，PGRN）是一种多功能的分泌型糖蛋白。其表达水平及相关基因的异常改变与神经系统炎性病变、退行性病变、变性疾病、脑中溶酶体的稳态及血脑屏障完整性密切相关，参与到多种神经系统疾病的病理过程。本文对PGRN的生物学作用及其与相关神经系统疾病的研究进展进行综述，以期为相关患者的干预及相关疾病的研究提供思路及理论依据。 【Abstract】 Progranulin (PGRN) is a multifunctional secretory ...
张青，张蓓，李亚军
doaj +1 more source
Exploring Challenges and Opportunities in International Healthcare Partnerships: A Thematic Analysis
World Medical &Health Policy, EarlyView.ABSTRACT In global health collaborations, countries of all development levels may seek international assistance, emphasizing trust and conflict resolution. However, existing frameworks lack sustainability metrics, governance, and evaluation criteria.
Salma Arabi +2 more
wiley +1 more source