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The main results of the investigation are as following:(1) Some important criteria for the design of multi-layer structure are acquired: the ratio of the layer thickness to the contact diameter should be controlled to a value about 0.8; increasing the number of the gradient layers and elasticity modulus of the top layer would benefit to the yield strength and the stress status at the interface.(2)By means of molecular dynamics simulations for a indentation and sliding process, it is discovered that dislocations of 45 direction to the surface occur in the surfaces layer, which is correspond to the direction of the plastic flows observed in the macroscopic continuous medium. The irreversible deformation caused by the dislocation and the atom piles at the surface are responsible for the irreversibility of the force response. They are also the main factors for the friction generation. The temperature and the indentation velocity have significant effects on the deformation behaviors of the material of the surface layer. The yield strength would increase obviously if the indentation velocity is greater than 10 m/s.(3)A method to evaluate the fracture toughness of coating by estimating the crack-density functionβof a Wicker''s indentation was proposed. Meanwhile a new surface treatment technology was developed using non-equilibrium plasma.(4)A MD-FE hybrid method and corresponding software was developed to analysis the tribological behaviors for multiplayer system.

研究主要内容和结果有:(1)得到指导梯度膜设计的几个准则:控制膜层厚度与接触半径比在0.8左右为宜;适当增加梯度层层数和顶层弹性模量,有利于提高抗屈服能力和改善界面处的应力状态;(2)通过对嵌入和滑动摩擦过程的分子动力学模拟,发现表层产生一个与宏观连续介质的塑性流动方向观测一致的45 方向位错;位错造成的不可逆变形和表面的原子堆积,是力的响应不可逆性的原因,也是构成摩擦力的主要因素;温度和嵌入速度对材料变形特性有显著的影响,当嵌入速度大于10 m/s时,屈服强度明显增加;(3)提出压痕裂纹密度系数β半定量判定膜层断裂韧性的方法;并开发出表面强化新工艺;(4)开发出分析表面摩擦学特性的MD-FE复合模拟方法和相应模拟软件。

Main contents and conclusions are: 1 The ionization current was measured continuously by a charge-integration method with a computer after the introduction of radon into the chamber.

主要内容及结论:1充氡后利用计算机连续进行电离电流累积测量,得到了精细的电流随时间的变化曲线,可清楚看出氡及其子体的生成衰变造成的电离电流的生长—稳定—衰减过程,与理论计算值进行了比较,由电离电流衰减速度的变化得出氡吸附作用的影响,并测量到电离室冲洗后氡的反扩散现象;2由已知活度的标准源定出相对测量的刻度系数K值,K=24.62 Bq/pA,对同一个监测源以半年为周期进行多次测量后得出稳定性符合要求;3通过测量电离电流和气压的关系曲线以及不同气压下的饱和曲线,确定了常规的工作条件;4测量了盐酸清洗电离室内表面降低本底的效果;5不确定度分析表明相对测氡的扩展不确定度(k=2)小于5%,由本底涨落得出探测下限为0.5 Bq;6理论上对壁损失修正进行了计算,实验上保持电离室工作在饱和区的情况下,测量了不同气压下电离电流的变化,从中得出了壁损失随气压变化的规律,可以看出,电离电流的实测值和计算值随气压变化规律基本一致;当气压大于125 kPa时,端效应等其它因素造成的影响不大于2%,因而在此工作条件下,测量电离电流后通过计算修正壁损失可以实现近似的绝对测氡,提出了进一步提高绝对测量准确度的方法。

And the tangent linear operator of the forward model also exists, which is the same as the resolvent of the tangent linear model derived by the conventional method.

对连续"开关",代价函数的梯度处处存在的,非线性方程的切线性算子也是存在的,并且与传统方法得到的切线性模型的解算子是一致的。

In chapter 2, we firstly introduce the model of a discrete-time neural network with generalized input-output function. The model generalizes the input-output function in transiently chaotic neural network to a class of continuous, differentiable and monotone increasing functions. Secondly we study the uniformly asymptotical stability of equilibrium in the non-autonomous model. Finally, several examples and numerical simulations are given to illustrate and reinforce our theories. In chapter 3, we firstly introduce a specific class of discrete-time neural network models with sinusoidal activation function.

在本文的第二章中,首先介绍了一类具有广义输入输出函数的非自治离散神经网络模型,该模型把瞬时混沌神经网络模型中的输入输出函数推广到了一般的单调递增且连续可微的函数;其次,利用Schauder不动点原理和利用Lyapunov函数逆定理依次证明了模型平衡点的存在性和该模型在时变权值下的一致渐近稳定性;最后,对几个具体的例子进行数值模拟,数值模拟的结果更好地说明了我们的结论。

The model generalizes the input-output function in transiently chaotic neural network to a class of continuous, differentiable and monotone increasing functions. Secondly we study the uniformly asymptotical stability of equilibrium in the non-autonomous model. Finally, several examples and numerical simulations are given to illustrate and reinforce our theories. In chapter 3, we firstly introduce a specific class of discrete-time neural network models with sinusoidal activation function.

在本文的第二章中,首先介绍了一类具有广义输入输出函数的非自治离散神经网络模型,该模型把瞬时混沌神经网络模型中的输入输出函数推广到了一般的单调递增且连续可微的函数;其次,利用Schauder不动点原理和利用Lyapunov函数逆定理依次证明了模型平衡点的存在性和在时变权值下的一致渐近稳定性;最后,对几个具体的例子进行数值模拟,数值模拟的结果更好地说明了我们的结论。

In this paper,we mainly make a deep and systematic study of sample path prop-erties for high and infinite dimensional Gaussian processes,especially for high andinfinite dimensional Wiener process in stronger norm-Holder norm than ever(everbefore,there used to be uniform norm and the process was limited to one dimen-sion).We not only deal with all kinds of functional moduli of continuity,but alsoconcern with different forms of functional limit theorems of C-R increments.

本文主要对高维的以至无穷维的Gauss过程、特别是Wiener过程的样本轨道性质在较以往更强的范数—〓范数下作了系统深入的研究(以往通常采用一致范数,过程限于一维),研究的内容不仅包括各种形式的泛函连续模,而且还包括各种形式的C-R增量的泛函极限定理。

Roentgenographic and histologic observation confirmed that bBMP had efficient bone morphogenetic activity.

论文第一部分参照杨连甲的方法从小牛骨基质中提取bBMP,经SDS-PAGE电泳分析,bBMP保留有BMP活性蛋白成分,植入小鼠股部肌肉后的X线及组织学观察发现,所提取的bBMP具有较高的骨诱导活性,诱导成骨的时间和过程与以往的报道一致。bBMP诱导骨形成过程呈现连续又具显著的阶段性,本研究结合组织学和组织化学观察的特点,将其全过程分为四个时期。

In Part 1 of our research, BGSCs were sorted through immunomagnetic beads marking by CD133 and cultured in vitro, and character as a stem cell was identified by stem cell markers (CD133 and Nestin) and differentiated cell markers [ microtubule-associated protein 2(MAP2), glial acidic fibrillary protein and myelin basic protein] , ultrastructure observing with electron microscopeand engrafting to severe combined immunodeficiency mice for tumorigenesis test. The results were as following: Only a small subset of CD133+ glioma cells in glioma cell lines and fresh specimens from various pathologic grade could express stem cell markers CD133 and Nestin, view ultrastructure of a stem cell and be capacity of serial passage in culture. These CD133+ cells possese a marked capacity for multipotent differentiation and could differentiate into tumor cells expressing MAP2,β-TubulinⅢ, GFAP and MBP; When engrafted into SCID mice, they can generate and form tumors that phenotypically resembl the tumor from the patient.

在本课题中,在第一部分实验中采用以CD133为标志的免疫磁珠法从人脑胶质瘤组织和细胞株中分离脑胶质瘤干细胞并进行体外培养,通过免疫荧光技术检测干细胞标志物CD133、Nestin,诱导分化后检查分化细胞标志物MAP2、GFAP、MBP以及电镜超微结构观察和移植SCID鼠致瘤实验,对其干细胞特性加以鉴定,得到如下结果:不同病理分级的新鲜胶质瘤标本和胶质瘤细胞株中存在一小部分CD133+的胶质瘤细胞,能表达干细胞的标志物CD133和Nestin,符合干细胞的超微结构特点,体外培养能连续传代;具有多向分化潜能:诱导分化后能产生MAP2、β-TubulinⅢ、GFAP、MBP染色阳性的细胞;移植SCID鼠后能形成与亲本肿瘤表型一致的移植瘤。

This invention relates to a method and device for generating cold atomic beam. Said method includes heating hot atom source in vacuum chamber to form atomic saturated vapor pressure atmosphere, cooling hot atom by three-D MOT to below 200uk and trapped to form cold atomic cloud, by the quarter wave plate reflection mirror in MOT the laser radiation pressure being unbalanced to make cold atom emitting along said direction, four tape arranged straight line set with contrary current direction is set in atom beam emission direction, which makes the atom emitted to forward to obtain cold atom beam with low speed, large flux and small transverse speed, laser beam vertical with atom beam set in the direction of cold atom emitting for atom beam state preparation to realize state concordant emitted cold atom beam.

本发明涉及一种冷原子束产生方法和装置,该方法包括在抽真空的真空室内,加热热原子源,在真空室中形成相应的原子饱和蒸汽压气氛;采用三维MOT对热原子进行冷却,冷却到200μk以下,并被捕获形成冷原子云团;通过三维MOT中开小孔的四分之一波片反射镜,而使得在该方向上激光辐射压力不平衡,使冷原子沿此方向出射;在冷原子束出射方向上,还置有载有彼此电流方向相反的四根成锥形排列的直导线,从而原子出射时将在磁场的作用下,不会沿横向膨胀而向前射出;便得到了出射速度低的、通量较大的、横向速度非常小的连续冷原子束;同时在冷原子束的出射方向上,设置有与原子束垂直的激光束,用于原子束的态制备,实现态一致的出射冷原子束。

JNS sulfuric-acid-dew-point-resistance steel has been put into practical use in the construction of steel-covered chimneys of the following electric power-generating stations: Zou xian Power Plant (2 1000 MW), Xiamen Songyu Power Plant (2 300 MW), Fujian Nanpu Power Plant(2 300MW),Shenzhen Power Plant (2 300MW). Many experienced experts held discussions with designers at scene and reached a unanimous conclusion that "JNS sulfuric-acid-dew-point-corrosion -resistance steel " is more stable in terms of function, more convenient to weld and process and more safe to use than " past sulfuric-acid-dew-point-resistance steel". Reports from various laboratories demonstrate that "JNS sulfuric-acid-dew-point-corrosion -resistance steel " is more effective to resist acid corrosion than the former steel , and many exports predict after thorough study that this acid of steel have a life span longer than 30 years being used in de-sulfurized chimneys and it is much less expensive than titanium alloy clad plates and Peenguard, etc.

JNS耐硫酸露点腐蚀钢板在山东邹县发电厂(2 1000 MW)、江苏泰州发电厂(2 1000 MW)、上海外高桥发电厂(2 1000 MW)、山西漳山发电厂(2 600 MW)、厦门嵩屿发电厂(2 300 MW)、福建南埔发电厂(2 300MW)、河北怀安发电厂(2 300MW)、吉林通化热电厂(2 300MW)等众多工程的烟囱钢套筒工程中得到了实际应用,许多老专家会同设计人员一起现场论证,一致认为&JNS耐硫酸露点腐蚀钢板&比以往的&耐硫酸露点钢板&性能更稳定,焊接更方便,更容易加工,使用更安全,来自各实验室的报告显示,&JNS耐硫酸露点腐蚀钢板&的耐酸性能也超过了过去的&耐硫酸露点钢板&,很多专家经过充分论证后预言,该钢种在脱硫后的烟囱中连续使用可保证三十年以上,而且JNS钢板的价格也远远低于钛合金复合板、宾高德等,采用JNS耐硫酸露点腐蚀钢板,可为电厂节约巨大投资,具有良好的经济效益和社会效益。

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推荐网络例句

Since historical times,England ,where the early inhabitants were Celts, has been conquered three times .

从有历史以来,英国,在此地早期居住的是凯尔特人,已经被征服了三次。

Bluetooth OBEX File Transfer Enables the sending and receiving of files on your phone via Bluetooth.

蓝牙OBEX文件移动允许经过蓝牙传送和接受文件。。。。

The almost sure central limit theorem is a pop topic of the probability research in recent years,because it has many actual applications in the random analogue.

中文摘要:几乎处处中心极限定理是近几十年概率论研究的一个热门话题。它之所以引起人们的注意是由于它在随机模拟方面的实际应用参见Fisher