Results 81 to 90 of about 1,703,447 (187)

A Global Analysis of Domestic Military Policies Governing Responses to Public Health Emergencies

open access: yesWorld Medical &Health Policy, Volume 18, Issue 2, June 2026.
ABSTRACT Throughout the COVID‐19 pandemic, militaries mobilized at an unprecedented scale to support domestic response efforts. This was consistent with the growing trend of asset mobilization for military operations other than war during public health emergencies.
Kuang Yu Hu   +4 more
wiley   +1 more source

一起罐式断路器故障原因分析及改进措施

open access: yesGaoya dianqi, 2022
针对网内发生的一起罐式断路器故障,文中通过对断路器故障情况及回路电阻、机械特性、X射线数字成像检测等试验情况进行分析,判断故障的原因为静主触头触指存在弯曲异常导致合闸后接触不良。解体分析确定故障根本原因是多次操作后断路器静主触头与动主触头出现对中不良的问题,对中不良引起动主触头与静主触头产生碰撞,导致静主触头部分触指向内弯曲,最终因接触不良造成罐式断路器发生外壳烧穿等故障。为消除隐患,最后文中从产品结构、工艺控制两方面对设备故障的原因进行了深入分析,提出了相应的实用改进措施,避免类似故障再次发生。
王贵山, 李应宏, 房博一
doaj  

华西蔷薇和中甸刺玫营养成分分析

open access: yes, 1997
华西蔷薇和中甸刺玫营养成分分析何永华曹亚玲李朝銮(中国科学院成都生物研究所610041)关键词华西蔷薇;中甸刺玫;营养成分;种质资源AnalysisoftheNutritionCompositionintheFruitsofRosamoyesian..
何永华,曹亚玲,李朝銮, 李朝銮
core  

Characteristics and sources apportionment of water-soluble ions in PM2.5 of Wenzhou, Zhejiang Province(温州市PM2.5中水溶性离子污染特征及来源分析)

open access: yesZhejiang Daxue xuebao. Lixue ban, 2017
2015年1~12月在温州市区采集448个PM2.5样品,采用离子色谱法分析PM2.5中9种水溶性离子(、Cl-、Na+、K+、Ca2+、Mg2+和F-)的浓度,研究其污染特征、化学组分和来源.采样期间9种水溶性离子总浓度为39.97 µg • m-3,和占所测水溶性离子总量的(40.19±10.04)%.离子总浓度的季节变化特征为冬季>春季>秋季>夏季,从空间分布上看,多数季节市站采样点PM2.5中离子总浓度低于南浦、龙湾和瓯海采样点.相关性分析结果显示,PM2.5值与、Ca2+、Na+、K+、Cl-、
GELinlin(葛琳琳)   +7 more
doaj   +1 more source

From pollen provision to pollinator: Species‐specific sterol assimilation by wild bees in urban landscapes

open access: yesFunctional Ecology, Volume 40, Issue 6, Page 1906-1920, June 2026.
Read the free Plain Language Summary for this article on the Journal blog. Abstract Human‐driven landscape change, particularly urbanization, is reshaping pollinator communities, yet the functional traits that mediate species persistence remain poorly understood. Dietary specialization is commonly used to predict species vulnerability.
Yan Yang   +5 more
wiley   +1 more source

Self-Repair Devices in Classroom Monologue Discourse [PDF]

open access: yes, 2011
[[issue ...
Chihsia Tang, 唐綺霞
core  

Plant economics traits predict plant carbon allocation and responsiveness to arbuscular mycorrhizal fungi under varying precipitation

open access: yesFunctional Ecology, Volume 40, Issue 6, Page 1921-1932, June 2026.
Read the free Plain Language Summary for this article on the Journal blog. Abstract Most terrestrial plant species form symbioses with arbuscular mycorrhizal fungi (AMF). However, the below‐ground carbon (C) allocation of plants and the nutritional and growth benefits provided by AMF within this symbiosis vary greatly across species and environments ...
Hengjun Zhao   +3 more
wiley   +1 more source

HPLC-ESI-MS/MS对灯盏花提取液中主要成分的分离定性

open access: yes, 2004
本文利用高效液相色谱-电喷雾-质谱/质谱(HPLC—ESI—MS/MS)联用对灯盏花提取液进行了分离,并对其中的主要成分进行了定性分析。一级质谱扫描结果表明,灯盏花提取液中主要有4个峰,其中,第一个峰可能为5,6,4-三羟基黄酮-7-o-β-D-半乳糖醛酸苷,第二峰为灯盏花乙素;后两峰为黄芩甙 ...
梁振, 张玉奎, 张维冰, 段继诚
core  

野化培训大熊猫夜宿地结构特征的初步观察

open access: yes野生动物学报, 2011
2004年3~9月,我们对卧龙自然保护区核桃坪基地野化培训大熊猫个体"祥祥"的夜宿地组成结构进行了初步观察,并采用主成分分析(PCA)对471组夜宿地数据所涉及的7种结构因子(廊道、竹林、余竹堆、岩石、乔木、倒木、灌草丛)进行了统计分析。结果表明:在大熊猫"祥祥"的夜宿地结构中,"廊道"、"竹林"和"乔木"是最主要的3个因子。经单因素方差分析检验表明,在对地势的选择中,"祥祥"偏爱坡度5°~30°的缓坡竹林 ...
谢浩   +13 more
doaj  

陇西县土壤氮储量的空间分布特征及其影响因素研究

open access: yesShuitu Baochi Xuebao, 2020
以陇西县600份土壤全氮含量数据为基础,应用地统计学研究陇西县土壤氮素的空间分布特征并计算了该区域的氮储量,采用相关性分析、主成分分析等方法探讨了影响全氮空间分布的影响因素。结果表明,陇西县土壤全氮含量为(0.734±0.306) g/kg,变异系数属于中等程度变异;氮密度平均值为0.091 kg/m2,氮储量为7.6×106 kg,其中0—10,10—30,30—50 cm土层氮储量分别占到0—50 cm土层氮储量的35.97%,7.06%,56.97%。陇西县土壤全氮含量及氮储量空间分布相似 ...
任建新   +4 more
doaj  

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