Results 1 to 10 of about 680,507 (148)

星载开关电源的电磁干扰抑制技术

Kongjian kexue xuebao, 2023
电磁干扰（EMI）抑制技术是保证航天器各功能单元正常运行互不干扰的重要技术。开关电源是航天器内电磁干扰的主要来源。基于对星载开关电源DC/DC和负载点电源POL电磁干扰特性的测试结果，提出了一种星载二次电源系统的电磁干扰抑制方案，采用高稳晶振+控制器+时钟管理芯片硬件与软件设计结合的方法，利用高稳晶振为电源模块提供稳定时钟，通过控制器实现时钟管理芯片的分频和时钟分配。系统以非同步方式上电，软件控制时钟管理芯片输出电源模块同步时钟，然后软件打开时钟同步的使能，实现星载开关电源（DC/DC和POL ...
周 莉, 马 晓勇, 武 林, 阎 敬业, 安 军社   +4 more
doaj   +2 more sources

充液挠性航天器姿态机动终端滑模控制

Kongjian kexue xuebao, 2023
对存在未知外界干扰、参数不确定问题的刚–液–柔多体耦合航天器姿态控制进行了研究。将液体燃料的晃动等效为球摆模型，挠性附件假设为欧拉–伯努利梁，运用拉格朗日方法建立航天器的动力学方程。将外界干扰、航天器转动惯量的参数不确定性以及液体晃动和挠性附件振动带来的耦合干扰归结为集总干扰，设计干扰观测器对其进行补偿；在干扰观测器的基础上，设计一种模糊滑模控制律。在原有的终端滑模控制基础上采用模糊控制对切换增益进行改进，达到抑制系统抖动的目的。数值仿真结果表明 ...
吴 涛涛, 宋 晓娟, 吕 书锋
doaj   +1 more source

Impacts of livestock grazing on blue‐eared pheasants (Crossoptilon auritum) survival in subalpine forests of Southwest China 散放家畜对中国西南山地亚高山森林雉类蓝马鸡的影响

Integrative Conservation, Volume 2, Issue 4, Page 201-213, December 2023., 2023
Livestock disturbances decreased the area of suitable habitat of forest pheasants by 14.28% in 7 years. Livestock activities remarkably increased the nest failure rate (by 2.18 times) of forest pheasants. Abstract The degradation and fragmentation of natural habitats, driven largely by anthropogenic activities such as grazing, represent growing ...
Xing Chen, Xiao‐Tong Shang, Fan Fan, Yong Zheng, Lian‐Jun Zhao, Hong‐Ou Sun, Sheng Li, Li Zhang   +7 more
wiley   +1 more source

Patient experiences of continuous glucose monitoring and sensor‐augmented insulin pump therapy for diabetes: A systematic review of qualitative studies 糖尿病患者接受连续血糖监测和传感器增强胰岛素泵治疗的体验:对定性研究的系统综述

Journal of Diabetes, Volume 15, Issue 12, Page 1048-1069, December 2023., 2023
Highlights We identified that CGM can increase motivation for self‐management and confidence in treatments. A supportive treating team may help to reduce the practical and psychological burden in patients with type 1 and type 2 diabetes. Abstract Aims Blood glucose control is central to the management of diabetes, and continuous glucose monitoring (CGM)
Patrizia Natale, Sharon Chen, Clara K. Chow, Ngai Wah Cheung, David Martinez‐Martin, Corinne Caillaud, Nicole Scholes‐Robertson, Ayano Kelly, Jonathan C. Craig, Giovanni Strippoli, Allison Jaure   +10 more
wiley   +1 more source

Prioritizing global tall forests toward the 30 × 30 goals

Conservation Biology, Volume 37, Issue 6, December 2023., 2023
Abstract The Global Deal for Nature sets an ambitious goal to protect 30% of Earth's land and ocean by 2030. The 30 × 30 initiative is a way to allocate conservation resources and extend protection to conserve vulnerable and underprotected ecosystems while reducing carbon emissions to combat climate change.
Qiongyu Huang, Jin Xu, Jesse Pan Wong, Volker C. Radeloff, Melissa Songer   +4 more
wiley   +1 more source

Nativity status and workplace discrimination in registered nurses: Testing the mediating role of psychosocial work characteristics 注册护士的国籍身份与职场歧视:心理社会工作特征调和作用的检验

Journal of Advanced Nursing, Volume 76, Issue 7, Page 1594-1602, July 2020., 2020
Abstract Aim To examine: (a) whether nativity status was associated with workplace discrimination, and (b) whether this association was mediated through psychosocial work characteristics (job strain, job demands, and job control) among registered female nurses. Design Cross‐sectional survey with a self‐report questionnaire was conducted.
Karolina Wesołowska, Marko Elovainio, Kaisla Komulainen, Laura Hietapakka, Tarja Heponiemi   +4 more
wiley   +1 more source

International clinical practice recommendations on the definition, diagnosis, assessment, intervention, and psychosocial aspects of developmental coordination disorder – Chinese (Mandarin) translation

Developmental Medicine &Child Neurology, Volume 61, Issue 3, Page E1-E35, March 2019., 2019
目的 本国际临床指南由欧洲残疾儿童学会（the European Academy of Childhood Disability，EACD）牵头制定，旨在解决发育性协调障碍（developmental coordination disorder，DCD）的定义、诊断、评估、干预以及与社会心理方面的临床应用关键问题。 方法 本指南针对五个领域的关键问题，通过文献综述和专家团队的正式讨论达成共识。为保证指南的循证基础，以“机制”、“评估”和“干预”为检索词, 对2012年更新以来提出的最新建议以及新增的“社会心理问题”和“青少年/成人”为检索词进行检索。根据牛津大学循证医学中心证据等级 (证据水平 [level of evidence, LOE]1–4) 将结果进行分类，最终转化为指南建议。并由国际 ...
Jing Hua, Wenchong Du, Xiaotian Dai, Meiqin Wu, Xianying Cai, Min Shen, Liping Zhu   +6 more
wiley   +1 more source

Flexible, Robust Transparent Conductive Films With Excellent Electromagnetic Shielding Properties

Rare Metals, Volume 45, Issue 8, August 2026.
ABSTRACT Transparent conductive films (TCFs) are indispensable components for next‐generation wearable electronics, intelligent robots, and electromagnetic interference (EMI) shielding devices. However, the fabrication of conventional random metallic mesh suffers from an inherent trade‐off between “randomness and controllability”.
Shanghao Lu, Longxia Yang, Faling Li, Yuping Duan, Changhui Mao, Haicheng Wang   +5 more
wiley   +1 more source

Root economic space is associated with rhizosphere microbial divergence via root metabolite‐mediated pathways in degraded grasslands

Functional Ecology, Volume 40, Issue 7, Page 2068-2082, July 2026.
Read the free Plain Language Summary for this article on the Journal blog. Abstract Grasslands worldwide are experiencing severe degradation due to overgrazing, climate change and anthropogenic disturbances, resulting in substantial declines in biodiversity and ecosystem functioning.
Xiaoqi Wang, Ruqiang Zhang, Dabu Xilatu, T. Martijn Bezemer, John Klironomos, Jingying Jing   +5 more
wiley   +1 more source

In Situ MOF Pyrolysis Construction of Hierarchical Porous Co‐Nanoparticles/Carbon Cloth Composites for Enhanced Electromagnetic Wave Shielding and Absorption

Rare Metals, Volume 45, Issue 2, February 2026.
ABSTRACT The development of high‐performance electromagnetic protection materials integrating broadband absorption and effective shielding capabilities is hindered by challenges in simultaneously optimizing multiple electromagnetic properties through conventional material designs.
Changlong Du, Lei Yu, Jieping Wang, Sichun Xiong, Pengpeng Mou, Lianrui Li, Zhi Nie, Gengping Wan, Jianguo Wen, Guizhen Wang   +9 more
wiley   +1 more source