Results 41 to 50 of about 1,228,217 (166)
He jishu传统的堆芯计算程序为了提高计算效率，通常采用简化的模型或者松散耦合的方式。然而，随着计算机性能的不断提高，对计算精度的追求越来越高，传统的方法无法更好地满足目前对于计算性能的要求。本研究旨在开发一种采用更精确理论模型、更紧密多物理场耦合方式的堆芯计算程序。采用半解析节块方法、微观燃耗方法和子通道热工水力模型开发了三维多物理堆芯分析程序，并通过程序内部耦合的方式实现中子学计算、热工水力计算以及燃料性能分析计算。同时为了提高计算效率，采用了组件-堆芯改进型两步法。为了验证程序的计算性能 ...
司 胜义 +5 more
doaj +1 more source
Integrative Conservation, Volume 4, Issue 3, Page 416-429, September 2025.Staghorn ferns are among the most highly valued ornamental plants but several species experience major extinction threats. Here we establish a DNA barcoding reference dataset to support reliable identification of cultivated staghorn ferns to secure species identity of individuals at all life stages that are used in ex situ and in situ conservation of ...
Kaikai Wang +6 more
wiley +1 more source
External validation of QUiPP App in three independent European cohorts of symptomatic women
Ultrasound in Obstetrics &Gynecology, Volume 66, Issue 2, Page 163-174, August 2025.ABSTRACT Objective To validate externally the QUantitative Innovation in Predicting Preterm birth (QUiPP) App v.2 for the prediction of spontaneous preterm birth (sPTB) in symptomatic women attending tertiary care in Europe. Methods The QUiPP App v.2 was validated in three independent datasets: a prospective European multicenter cohort across five ...
A. M. Fischer +8 more
wiley +1 more source
, 2017 本发明属于联合收割机田间产量检测技术领域，具体涉及一种联合收割机谷物流量检测装置和测量方法，检测装置安装在收割机升运器出口处，主要用于收割机在田间作业时对谷物流量进行实时检测。本装置主要由PVDF压电薄膜、承接板、调节架、固定架、电荷放大器、采集模块组成。当谷物冲击PVDF压电薄膜上时，使PVDF压电薄膜的两极产生电荷。电荷放大器将这种电荷进行放大以标准电压输出。采集模块实时采集电荷放大器输出的电压，经转换处理得到谷物流量值，并将结果以数字通信方式输出。本发明测量精度高，抗干扰能量强 ...
张天 +5 more
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Zhongguo shiyan zhenduanxue, 2014 目的探索高分辨率熔解曲线法（high resolution melting,HRM）检测胱硫醚β-合酶（CBS）基因SNP位点所需的最佳反应体系和条件,建立快速高效的对CBS基因分型的方法。方法通过普通PCR初步确立引物的退火温度范围,在实时荧光定量PCR（qPCR）-HRM反应中调整确定最佳退火温度。对影响qPCR-HRM的因素包括反应程序、模板DNA、MgCl2再分别进行优化,确立最佳反应体系和反应条件,对在此基础上得出的基因分型结果通过测序验证其准确性 ...
于坤坤 +4 more
doaj
New Phytologist, Volume 247, Issue 2, Page 504-517, July 2025.Summary Repetitive DNA is a feature of all organisms, ranging from archaea and plants to humans. DNA repeats can be seen both in coding and in noncoding regions of the genome. Due to the recurring nature of the sequences, simple DNA repeats tend to be more prone to errors during replication and repair, resulting in variability in their unit length ...
Sridevi Sureshkumar +3 more
wiley +1 more source
, 2010 本发明公开了一种多功能传感器及高温下测量热流与温度的方法，其中多功能传感器包括外壳和热流测头，外壳上设置热流测头，热流测头包括热流探头和热沉，热沉与热流探头相连容置在外壳内部与热流探头组成热电偶，所述外壳内还设置有用于冷却热流测头的冷却装置和用于测量热沉温度的另一热电偶，两热电偶与检测仪相连，通过测量出两热电偶的电压信号实现热流和温度的检测。本发明公开的测量方法通过测量低温的温度，建立数学模型推导得出高温处的所测温度。本发明的多功能热传感器能够在高温环境下测量热流和温度 ...
王晶, 李龙, 范学军, 仲峰泉
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He jishu对于反应堆热工水力参数的预测，现有的研究多使用单一神经网络的预测方法，但在噪声较大的情况下，单一神经网络不能很好地剔除噪声的影响。本文使用基于经验模态分解法（Empirical Mode Decomposition，EMD）与奇异谱分析法（Singular Spectrum Analysis，SSA）结合自适应径向基神经网络（Radial Basis Function Neural Network，RBF）的组合模型提高堆芯热工参数瞬态预测的精度。采用1/2中国实验快堆（China ...
赵 梓炎 +4 more
doaj +1 more source
, 2016 本发明公开了一种高速航体的阻力测量装置和测量方法，该装置包括：高速航体入水系统，用以将航体样品加速到40~400m-s；航体初速度测量系统，用以测量航体样品入水前的速度；航体水下运动速度及流体场测量系统，用以测量航体样品水下运动的速度以及流体场的变化；水箱，用以提供航体样品水下运动的场所。本发明测量装置结构简单，使用方便，测量方法简单易操作，结果准确，可以将现有航体阻力评价手段由低速航体扩展到高速航体，突破了现有低速航体阻力测试的局限 ...
乌学东 +5 more
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Auto-focus technology and its application based on image processing
, 2009 Auto-focusing technique is an important method to improve the precision,intelligentization,automatization for the indentation diameter measurement.The paper introduces an auto-focus method of indentation diameter measurement based on image processing ...
Chen, Xiaomei, Yang, Tao, Zuo, Yong
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