Results 31 to 40 of about 19,043 (173)

Excellent Comprehensive Electromechanical Properties in PZT‐Based Hard High‐Temperature Piezoceramics

open access: yesRare Metals, EarlyView.
ABSTRACT High‐power piezoelectric ceramics which have a wide operating temperature range are essential for sensor and actuator applications in extreme conditions. However, their development is fundamentally hindered by the inherent trade‐off among key parameters (TC, d33, Qm).
Rui Yan   +10 more
wiley   +1 more source

数学形态学在串联型故障电弧诊断中的应用

open access: yesGaoya dianqi, 2016
故障电弧是导致设备或线路电气火灾故障的原因之一。为了实现对配电系统中串联型故障电弧的快速诊断,文中提出了一种基于数学形态学的串联型故障电弧诊断方法。该方法利用数学形态学的开闭运算,有效地滤除电流信号中的噪声干扰,并通过多分辨率形态梯度(MMG)运算提取串联型故障电弧发生前后电流波形的突变特征,进而获取正常工作情况下和故障电弧发生时线路电流波形的形态梯度值。通过比较故障发生前后线路电流波形形态梯度值的大小,可以准确地判断出线路是否发生了电弧故障。该串联故障电弧诊断方法具有逻辑运算简单 ...
刘振国, 孙鹏, 由广祥
doaj  

Study on the species identification and the species interactions in the phycosphere of Alexandrium tamarense [PDF]

open access: yes, 2015
本文发现了一种生活在塔玛亚历山大藻(Alexandriumtamarense)藻际中的棕鞭藻。通过形态学和分子生物学的综合分析,确定该棕鞭藻为棕鞭藻(Ochromonassp.)。应用传统生物学与现代微流控技术相结合的手段,研究了该棕鞭藻的生活习性,并对藻际中塔玛亚历山大藻、棕鞭藻、细菌三者之间的相互关系进行了研究。本文的研究内容主要有一下几个方面: 1.通过光学显微镜、荧光显微镜和扫描电子显微镜对该棕鞭藻进行了形态学观察,确定了棕鞭藻的大小为2-3μm,外表呈球形,头部端具不等长的两条鞭毛 ...
胡丽丹
core  

Regulating TGO Nucleation and Growth of MCrAlX Coatings via Femtosecond Laser Remelting: The Role of Reactive Elements in the Oxidation Resistance

open access: yesRare Metals, EarlyView.
ABSTRACT MCrAlX coatings are widely used as bond coats in thermal barrier coating systems to protect turbine blades from high‐temperature oxidation. However, their oxidation resistance is often restricted by uncontrolled microstructures, surface roughness, and aggregation of reactive elements (REs). In this study, high‐repetition‐rate femtosecond laser
Wei Qian   +7 more
wiley   +1 more source

微课在骨髓血细胞形态学教学中的应用

open access: yesZhongguo shiyan zhenduanxue, 2019
骨髓血细胞形态学检查是通过观察骨髓涂片中细胞的形态以及细胞间的比例关系来检查骨髓细胞数量和质的变化,是诊断造血系统疾病最常用的基本方法。但血细胞形态学研究对象为看不见摸不着的血细胞,学生们理解并掌握起来有相当大的难度,给教师和学生提出了一个不小的挑战。
崔红花   +5 more
doaj  

The cloning,expression and characterization of the Marsupenaeus japonicus ML gene (MjML) [PDF]

open access: yes, 2016
日本囊对虾(Marsupenaeusjaponicus)是我国四大养殖对虾品种之一,具有重要的经济价值。日本囊对虾幼体发育过程复杂,受精卵孵化后需要经过无节幼体,溞状幼体,糠虾幼体和仔虾4个发育阶段,发育过程中蜕皮频繁,蜕皮周期较短。近年来,随着日本囊对虾养殖规模的逐步扩大,各种细菌性疾病对其养殖业的发展造成了巨大的影响,并造成了严重的经济损失。 ML(MD-2-relatedLipid-recognition)家族为一类具有保守ML单结构域的蛋白质,能够直接和脂类结合 ...
徐伊桦
core  

Morphological and Molecular Characterization of Eimeria saudiensis From Arabian Oryx (Oryx leucoryx) Held in Captivity in the Sultanate of Oman 阿曼苏丹国圈养阿拉伯羚羊 (Oryx leucoryx) 体内沙特艾美球虫 (Eimeria saudiensis) 的形态学与分子特征

open access: yesWildlife Letters, EarlyView.
Eimeria saudiensis represents a genus of apicomplexan parasites capable of inducing coccidiosis in Arabian oryx. Our research concentrated on the morphological and molecular investigation of Eimeria spp. in the captive oryx herd in Oman. The therapeutic and management practices employed at the Mammals Breeding Center were reassessed to diminish ...
Khalid Al‐Habsi   +7 more
wiley   +1 more source

Development of Radiolabeled tumor-specific targeting peptides for PET Imaging [PDF]

open access: yes, 2015
多肽具有优良的药动学特性和生物学活性,因此在PET分子影像领域,多肽类分子影像探针展现出广阔的应用前景和优势。本课题利用AlF螯合法标记多肽,开发出一系列PET探针,并对相应探针进行体外及体内生物学评价。本课题具体研究内容可分为四部分。 第一部分,肝癌是最常见也是最致命的癌症之一,对于肝癌转移复发目前尚无行之有效的诊断、治疗方法。本研究通过固相法合成NOTA-G-TMTP1,并利用18F标记制得PET探针[18F]AlF-NOTA-G-TMTP1。[18F]AlF-NOTA-G-TMTP1标记产率为 ...
李业森
core  

Conservation Status, Decline Factors, and Strategies for Globally Endangered Musk Deer (Moschus spp.) in China 中国境内全球濒危麝属 (Moschus spp.) 物种的保护现状、致危因素及应对策略

open access: yesWildlife Letters, EarlyView.
This review summarizes the status of musk deer in China, highlighting severe population declines due to illegal hunting and habitat loss, and proposes integrated conservation strategies including habitat protection, captive breeding, and law enforcement to support the recovery and sustainable management of this ecologically and economically important ...
Feng Jiang   +8 more
wiley   +1 more source

结构形态创构方法的工程应用

open access: yesJianzhu Gangjiegou Jinzhan, 2011
结构形态创构方法是一种以数值计算为基础,运用数学、力学原理来追求力学合理,形式美观的建筑结构形态的方法。主要包括以下两种方法:"改进进化论方法"是模仿自然界的进化现象,通过进行"保留、淘汰、补充"的操作使结构体逐步进化并演变成合理结构的结构形态创构方法;而"高度调整方法"是基于有限元法,通过计算应变能对曲面高度的微分,并根据应变能变化的敏感程度对曲面高度进行调整,最终得到一个结构应变能最小的合理结构形态的自由曲面结构形态创构方法。该方法简单、实用,所得到的结构不但能保证实现建筑师的设计理念 ...
崔昌禹, 姜宝石, 崔国勇
doaj  

Home - About - Disclaimer - Privacy