Results 21 to 30 of about 9,018 (165)
Conservation Biology, Volume 39, Issue 2, April 2025.Abstract Emerging infectious diseases are increasingly recognized as a significant threat to global biodiversity conservation. Elucidating the relationship between pathogens and the host microbiome could lead to novel approaches for mitigating disease impacts.
Alexander S. Romer +25 more
wiley +1 more source
Integrative Conservation, Volume 3, Issue 4, Page 368-381, December 2024.Lack of species information complicates understanding climate change vulnerability, but life history traits can be proxies for missing information. In the north‐central United States, useful traits for discriminating vulnerability of amphibians include range size, clutch size, diel activity patterns, and habitat breadth.
Ross K. Hinderer +2 more
wiley +1 more source
Guangtongxin yanjiu, 2001 改变 2 .5Gbit/s光发射模块消光比 （ EX） ,对作为标准接收用的光接收机灵敏度进行了测试 .实验表明 ,EX小于 9.0时 ,光接收灵敏度较差 ;EX大于 1 5.0时 ,由于眼图中交叉点偏低或光脉冲波形畸变 ,可能导致光接收灵敏度恶化 ;EX在 9.0～ 1 2 .0范围时 ,光接收灵敏度最佳 .
丁国庆, 邓柱斌
doaj
Design, synthesis and preliminary bio-evaluation of progestrone receptor targeting probes for breast cancer imaging with PET [PDF]
, 2016 乳腺癌是严重威胁女性健康的疾病，它的早期诊断能够有效的降低病人的死亡率。孕激素受体属于核受体超家族，有PRA和PRB两种亚型，在调节和控制卵巢，子宫和乳腺的功能方面有重要作用。研究表明，在雌激素受体阳性（ER+）的乳腺癌病人中，PR的表达与否不会对病人接受他莫西芬治疗的疗效产生影响。但是在雌激素受体表达阴性（ER-）的乳腺癌病人中，病人接受他莫西芬治疗的疗效依赖于PR的表达。因此，监测PR的表达对乳腺癌的早期诊断和ER-/PR+病人的治疗都是很重要的。PET的灵敏度高，空间分辨率好，安全性也较好 ...
吴晓伟
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Ultrasound in Obstetrics &Gynecology, Volume 64, Issue 6, Page 768-775, December 2024.Abstract Objective Lower urinary tract obstruction (LUTO) is a chronic condition with a spectrum of outcomes. It is usually suspected prenatally based on ultrasound features (USFs). Given the unknown postnatal trajectory and the potential for significant morbidity and mortality, many families choose termination of pregnancy (TOP), often based on USFs ...
J. Richter +10 more
wiley +1 more source
Guangtongxin yanjiu, 2010 文章重点分析了应用于光模块灵敏度外推法测试中的误码率（BER）与灵敏度成线性关系的理论依据;并通过实验验证了这一线性关系。试验结果显示,百兆、千兆光收发合一模块的灵敏度与lg[-lg（BER）]的相关系数分别为0.999 79、0.999 06,线性度良好;并结合误码率的可靠性测量,提出了优化的灵敏度外推法测试方案。
朱梦霞, 樊志刚, 梁国涛
doaj
Methods and Applications for the Modulation of Surface Plasmon-Coupled Emission Signal [PDF]
, 2016 表面等离子体耦合荧光（Surfaceplasmon-coupledemission，SPCE）是一种利用纳米金属薄膜表面的自由电子与其近场范围内的荧光分子相互作用而产生信号的特殊的纳米光学现象，因其具有定向发射、高度偏振、波长分辨、距离依赖和背景抑制等独特性质而受到了广大分析研究工作者的广泛关注。SPCE发射信号具有强定向性，使得信号的收集效率大大提高，且可在信号产生过程中获得等离子体电磁场增强，荧光增强极为显著。近年来，随着对检测要求的逐渐提高，进一步增强SPCE信号，提高体系检测灵敏度显得尤为重要 ...
谢凯信
core
Ultrasound in Obstetrics &Gynecology, Volume 64, Issue 5, Page 661-668, November 2024.ABSTRACT Objective To determine the diagnostic accuracy of virtual autopsy using whole‐body postmortem ultra‐high field magnetic resonance imaging (MRI) at 7 Tesla (T), using a short T2‐weighted imaging (T2‐WI) protocol, compared with classical autopsy, for detecting structural abnormalities in small second‐trimester fetuses. Methods Thirty consecutive
A. Staicu +11 more
wiley +1 more source
Gaoya dianqi, 2018 半波长交流输电线路输送距离长、电压等级高,呈现出明显的分布参数特性,传统的继电保护原理不再适用。文中提出了一种高灵敏度、低灵敏度相配合的贝瑞隆差动保护改进算法,保护半波长交流输电线路的全长。其中低灵敏度贝瑞隆差动,用于保护半波长线路区内两端区域短路故障。高灵敏度贝瑞隆差动,用于保护半波长线路区内中间段区域短路故障。基于电磁暂态仿真软件PSCAD搭建特高压半波长输电线路仿真模型,并对提出的保护算法进行了大量的仿真实验。结果表明,低灵敏度贝瑞隆差动保护可以保证区内两端区域保护快速性 ...
陆金凤 +4 more
doaj
Study of L-band High Frequency Surface Acousitc Wave Sensors Based on E-Beam Lithography [PDF]
, 2015 谐振型声表面波传感器因具有体积小、测量精度高、易于无线无源化等特点，能够胜任封闭狭窄环境及高速转部件等复杂条件下的温度、压力、振动、湿度、应变等环境参数的测量。目前，谐振型声表面波传感器多工作在P波段，器件和天线的尺寸相对较大，灵敏度相对较低。为满足无线传感网络对传感器件微型化和无线无源化的需求，有必要对工作频段更高、特征尺寸为亚微米量级的谐振型声表面波传感器的设计和制造开展深入研究。 本文首先阐述了谐振型声表面波传感器的核心部件—声表面波谐振器(SAWR)的工作原理 ...
张鸿
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