搜索结果: 1-15 共查到“理学 em”相关记录26条 . 查询时间(0.069 秒)
李金华等-EM：环境趋磁细菌单细胞鉴定和综合研究技术路线图（图）
环境 趋磁细菌 单细胞鉴定 综合研究技术路线图
2023/1/16
摘要：微生物是地球上最古老且延续至今的生命形式。它们种类繁多、功能多样、分布极广、数量庞大，扮演着生产者、消费者和分解者的角色，参与近40亿年的地球演化，并且还在持续影响地球的物质元素循环和气候环境变迁等。开展现代环境中微生物多样性和地质记录中微生物化石综合研究，是理解微生物参与地球和生命演化过程和机制的关键所在。尽管微生物的研究已有三百多年的历史，然而目前成功分离培养的微生物仅占0.1%-1.0...
Cryo-EM images reveal how key biological machine unfolds problem proteins
Cryo-EM images biological machine proteins
2017/7/21
Hand over hand. That's how new, near-atomic resolution, 3-D snapshots show that a key biological machine unfolds a ribbon of protein through its central channel.The machine is a protein complex called...
4.0-A resolution cryo-EM structure of the mammalian chaperonin TRiC/CCT reveals its unique subunit arrangement
4.0-A resolution cryo-EM structure mammalian chaperonin TRiC/CCT reveals unique subunit arrangement
2015/12/11
The essential double-ring eukaryotic chaperonin TRiC/CCT (TCP1-ring complex or chaperonin containing TCP1) assists the folding of approximately 5-10% of the cellular proteome. Many TRiC substrates can...
Presence-Only Data and the EM Algorithm
Boosted trees EM algorithm Logistic model Presence-only data Use-availability data
2015/8/21
In ecological modeling of the habitat of a species, it can be prohibitively expensive to determine species absence.Presence-only data consist of a sample of locations with observed presences and a sep...
VLF-EM and VES: an application to groundwater exploration in a Precambrian basement terrain SW Nigeria
Electromagnetic (VLF-EM) Hard rock environment Groundwater development Layer resistivity Bed thickness mappingss mapping
2015/8/17
In a hard rock environment with surface or near surface expression of outcrops, the use of VES only becomes difficult due to its associated problems and limitations. However, the use of VLF-EM becomes...
Reconstructing Structured Sparse Signals from Compressive Samples via a Max-Product EM Algorithm
Belief propagation expectation maximization (EM) algorithm hidden Markovtree(HMT) max-productalgo-rithm,structured sparsity,sparse signal reconstruction.
2012/11/22
We propose a Bayesian expectation-maximization (EM) algorithm for reconstructing structured approximately sparse signals via belief propagation. The measurements follow an underdetermined linear model...
Simulation of Pair Production in Extreme Strong EM Fields
Schwinger-mechanism pair production space-time dependent fields
2012/5/29
In this article we review a theoretical framework for pair production from strong external electromagnetic fields. We propose a numerical method to solve the resulting equations of motion and present ...
昆虫细胞系在病毒生物学、 基因功能的研究以及杆状病毒表达系统生产重组蛋白的应用中发挥着重要的作用。本研究由家蚕Bombyx mori “大造”品种反转期胚胎建立了一株细胞系Bm-Em-1， 在含10％胎牛血清的TNM-FH培养基中已传代40余代。显微观察表明， 细胞形态主要为圆形和短梭形， 细胞染色体呈短棒状和颗粒状， 数量多、 异倍化， 符合典型的鳞翅目昆虫细胞染色体特征。RAPD鉴定结果表明，...
基于EM算法的无失效数据的参数估计
无失效数据 EM算法 多项分布
2011/11/11
本文利用EM算法，在无失效数据样本下，引进失效信息，对指数分布的参数进行估计，得到了参数所满足的非线性方程，并利用EM算法的收敛性，保证得到的非线性方程解，正是收敛于参数真值的估计。最后对实际数据进行计算，结果合理。
Precise determination of muon and EM shower contents from shower universality property
shower universality muon signal electromagnetic signal Cherenkov water detectors
2011/10/17
We present two new aspects of Extensive Air Shower (EAS) development universality allowing to make accurate estimation of muon and electromagnetic (EM) shower contents in two independent ways. In the ...
Esparsidade, Estrutura, Escalamento e Estabilidade em Algebra Linear Computacional
Algebra Linear Computacional Computation
2011/9/21
Abstract: Sparsity, Structure, Scaling and Stability in Computational Linear Algebra - Textbook from the IX School of Computer Science, held on July 24-31 of 1994 at Recife, Brazil. Esparsidade, Estru...
退化数据分析的EM算法
退化数据 随机效应 EM算法
2014/1/11
提出了用EM算法对产品可靠性进行分析. 在退化模型中, 当随机效应服从指数族分布时, 推导了参数估计的一般公式并且通过模拟评价了随机效应分布选取的敏感性. 最后分析了两个实际例子.
基于eM-Plant的参数化虚拟组合设备
自动化组合设备 eM-Plant 建模与仿真 调度
2013/2/23
由于大直径晶圆的加工具有严格的逗留时间约束和时间波动, 使得组合设备的调度及其可行性的验证存在很大的困难, 而仿真是一个有效的方法. 如果组合设备的调度存在可行性, 那么, 通过仿真能够找到系统的可行调度. 利用eM-Plant建立了虚拟的单臂组合设备, 该系统是可重配置的. 不同类型的晶圆加工具有不同的晶圆流模式和加工时间, 该虚拟组合设备能够模拟不同的晶圆加工, 而参数化的虚拟组合设备实现了可...
ACPH (Acyclic continuous phase type)分布类在[0, +∞)上的全体连续概率分布函数类中稠密,是具有通用性的概率分布类.提出采用EM (Expectation maximization)算法解决ACPH分布的数据拟合问题,给出了ACPH分布数据拟合的封闭形式EM算法,并通过6个拟合实例验证了该方法的有效性.