Results 31 to 40 of about 190,115 (170)

Changing trends in prenatal screening and treatment of cytomegalovirus infection in France: 7‐year national cohort study (2017–2023)

open access: yesUltrasound in Obstetrics &Gynecology, Volume 67, Issue 6, Page 756-763, June 2026.
ABSTRACT Objectives Cytomegalovirus (CMV) is the leading cause of congenital infectious neurosensory impairment. We aimed to present national epidemiological data on maternal CMV infection during pregnancy in France, focusing in particular on primary infection in the periconceptional period or first trimester, and to assess the impact of changes in ...
P. Coste‐Mazeau   +176 more
wiley   +1 more source

一种由直流后备式熔断器和直流真空负荷开关构成的直流组合电器

open access: yesGaoya dianqi, 2015
提出了一种由直流后备式熔断器和直流真空负荷开关串联组成的直流组合电器,对其直流开断特性进行了仿真和实验研究。新型直流组合电器可完成直流电流的全范围开断:当开断额定电流和过载电流时,采用真空直流负荷开关利用人工电流过零法开断电流,此时后备式熔断器不动作;当开断大过载电流和短路电流时,采用后备式直流熔断器直接开断大电流,也可以将大电流限制至较低幅值再采用真空直流负荷开关进行分断。实验结果证明,该直流真空负荷开关可以在5 ms内成功开断200 A至1.7 k A的直流电流,直流后备式熔断器可以开断1.7 k ...
刘思远   +7 more
doaj  

基于KEMA电弧模型的SF6断路器直流分量开断能力研究

open access: yesGaoya dianqi, 2020
电力系统短路电流中直流分量的衰减时间常数超过现有断路器的标准时间常数将导致断路器实际开断能力下降,因此亟需研究直流分量对高压断路器的影响以准确评估其开断能力,防止开断失败造成重大损失。文中提出基于KEMA电弧模型研究SF6断路器直流分量开断能力的方法。首先,将KEMA模型引入直流分量开断仿真中,给出额定开断能力对应的临界电弧参数获取方法,然后使用临界参数仿真实际含更高直流分量的短路电流,最后用该方法验证宁夏电网断路器的实际开断能力。研究结果表明,当断路器的额定开断能力包含20%的直流分量时 ...
丁培   +6 more
doaj  

Relative Habitat Suitability of the Gray Fox (Urocyon cinereoargenteus) in the Central Great Plains 大平原中部灰狐 (Urocyon cinereoargenteus) 的生境相对适宜性

open access: yesWildlife Letters, Volume 4, Issue 2, Page 94-101, June 2026.
Although once abundant across its range, gray foxes (Urocyon cinereoargenteus) are purportedly declining. While range maps indicate that gray fox potentially occur throughout the central United States, contemporary distribution maps are needed. We developed a Habitat Suitability Model for six states, leveraging gray fox presence data in an ensemble ...
Daniel J. Benson   +4 more
wiley   +1 more source

运行与检修问答

open access: yesGaoya dianqi, 1995
[问]何谓负荷开关—熔断器组合电器? [答]负荷开关—熔断器组合电器一般是指由三极负荷开关和三个带撞击器的熔断器组合而成的电器,当任何一个撞击器动作时,负荷开关的三级皆全部自动分闸。 此组合电器工作时,通常由负荷开关担任关合和开断工作电流和较小倍数的过载电流,而由熔断器开断较大倍数的过载电流和短路电流。 [问]负荷开关—熔断器组合电器的熔断器上为何要安装撞击器?
涟生
doaj  

Wings of Change: Motivations, Challenges, and Environmental Concerns Among Birdwatchers 变革之翼:观鸟者的动机、挑战与环境关切

open access: yesWildlife Letters, Volume 4, Issue 2, Page 83-93, June 2026.
Birdwatching in Nepal has high potential to support avain biodiversity and tourism. Conservation was identified as the primary motivation for birdwatching, followed by enjoyment and achievement purposes. Health/wellbeing benefits, social and economic factors showed moderate representation, whereas academic motivation played a relatively minor role ...
Kamal Raj Gosai, Hem Bahadur Katuwal
wiley   +1 more source

Biodiversity‐driven spatial conservation planning to delineate temporally stable regions

open access: yesConservation Biology, Volume 40, Issue 3, June 2026.
Abstract The accelerating loss of biodiversity underscores the critical need for effective conservation strategies, particularly in the face of climate change and anthropogenic pressures. We devised a conservation planning framework that adopts a temporal stacking approach to species distribution models and landscape connectivity analyses. These models
Mattia Iannella   +5 more
wiley   +1 more source

ABCA12 Frameshift Deletion in Domestic Cats With Ichthyosis Fetalis

open access: yesVeterinary Dermatology, Volume 37, Issue 3, Page 365-374, June 2026.
ABSTRACT Background Ichthyosis fetalis (IF), also known as harlequin ichthyosis, is a rare and often fatal autosomal recessive congenital skin disorder. It is characterized by thickened, hard skin plaques and deep skin fissures that limit mobility and cause malformations of the eyes, lips and ears.
Jeanna M. Blake   +2 more
wiley   +1 more source

A Dual‐Function Mitochondria‐Targeted Polyoxometalate Nanomicelle Boosts Pyroptosis‐Dependent Antitumor Immune Response in Triple‐Negative Breast Cancer

open access: yesRare Metals, Volume 45, Issue 5, May 2026.
ABSTRACT The efficacy of immunotherapy in triple‐negative breast cancer (TNBC) is often limited, whereas the immunotherapeutic potential of pyroptosis is frequently undermined by a compensatory surge in mitophagy. To address this challenge, this study developed a reactive oxygen species (ROS)‐responsive and mitochondria‐targeted nanomicelle (POM@CTT ...
Qingqing Dou   +6 more
wiley   +1 more source

超导限流式直流开断技术2:开断模块仿真分析

open access: yesGaoya dianqi, 2015
文中提出了一种新型的基于超导限流技术的自激型直流断路器,该断路器由超导限流模块和直流开断模块组成。笔者的研究目标是分析直流开断模块的自激开断过程以及相关参数对开断过程的影响,验证原理可行性。文中研究了该超导限流式直流断路器在不同额定电压下(10、100、320 k V)开断的可行性。通过研究10 k V的额定电压下交换回路参数和电弧参数对开断特性的影响,100 k V额定电压下仿真开断模型工作过程,320 k V下限流模块和开断模块配合原理,得出该直流断路器原理可行 ...
项彬   +4 more
doaj  

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