Scanning ion conductance microscopy of living cells

Currently there is a great interest in using scanning probe microscopy to study living cells. However, in most cases the contact the probe makes with the soft surface of the cell deforms or damages it. Here we report a scanning ion conductance microscope specially developed for imaging living cells. A key feature of the instrument is its scanning algorithm, which maintains the working distance between the probe and the sample such that they do not make direct physical contact with each other. Numerical simulation of the probe/sample interaction, which closely matches the experimental observations, provides the optimum working distance. The microscope scans highly convoluted surface structures without damaging them and reveals the true topography of cell surfaces. The images resemble those produced by scanning electron microscopy, with the significant difference that the cells remain viable and active. The instrument can monitor small-scale dynamics of cell surfaces as well as whole-cell movement.     

光电子集成器件研究的新进展

本文介绍 OEIC 器件,侧重于基于 GaAs 和 InP 材料的、应用于光纤通信的 OEIC 发射器、接收器和中继器的发展现状、器件性能和各种关键新工艺,并探讨了其发展动向。     

认知超宽带网络的容量分析和最优化

The integration of cognitive radio and Ultra wideband (UWB) networks has attracted lots of research interests. Cognitive UWB networks not only provide very high data rates but also guarantee the uninterrupted communication of primary system operated in the same frequency band. In this work, the problem of the capacity analyses of cognitive UWB networks is investigated. Different from the conventional cognitive spectrum sharing model which can only utilize the idle spectrum hole, the cognitive UWB system can...     

Multi-level multi-area hybrid automatic voltage control system and its trial operation in Northeast China Grid

In order to coordinate automatic voltage control(AVC)systems of a large interconnected system,a multi-level multi-area hybrid automatic voltage control(MLMA-HAVC)system was constructed.This system began its trial operation in the Northeast China Grid in January 2010,and for the first time in China and abroad it realized automatic close-loop control of multi-area and multi-level interconnected power grid and multi-objective self-approaching optimization in aspects of security,high quality and economic operat...     

Model updating based on incomplete modal data

The objective of model updating is to improve the accuracy of a dynamic model based on the correlation between the measured data and the analytical (finite element) model. In this paper, we intend to update the mass and stiffness matrices of an analytical model when only modal frequencies or spatially incomplete modal data are available. While the proposed method is systematic in nature, it also preserves the initial configuration of the analytical model, and physical equality and/or inequality constraints ...     

Removing coarse sediment by sorting of reservoirs

Reservoir sedimentation is an unsolved problem.In this paper,based on measured data,theoretical analysis and numerical computations,we prove that a proportion of the sediment coarser than 0.1 mm(CS) is sorted and deposited in specific reaches in the upper backwaters or in run-of-river reservoirs.The ratio of CS is usually small but it impacts the slope of deposition delta greatly and raises the backwater in later stages for a river shaped reservoir(RSR).Based on these facts,we propose to remove such CS from...     

沿空巷破碎煤体自燃耗氧及升温特征数值模拟

为研究巷道顶煤和煤柱破碎后由漏风引起的自燃耗氧及升温规律,在质量、动量和热量守恒模型的基础上利用FLUENT软件求解了沿空巷周围破碎煤体的稳态氧气分布和温度的动态变化过程。计算结果表明：在煤柱较完整的情况下,顶煤的氧气浓度分布高于煤柱,但二者都具有自然发火的危险。由于散热作用,高温区离二者的漏风边界都有一定的距离,顶煤升温速率较煤柱更快。在改变漏风强度后,高温区位置和范围也会随之改变。此研究结论可以帮助缩小现场火源区的寻找范围,以便及时采取措施抑制自燃。     

Two Modes and Criterion of Brittle Fracture

The plastic zone at the tip of the flaw (including acute cark and common notch) was investigated. Forthe notch specimen, a formula of toughness K was proposed, and its physical meaning was emphasized.Twomodes of brittle fracture was identified and the evaluating criterion was established.     

Two Algorithms for Fast Polyhedron Ray-Tracing

ＴｗｏＡｌｇｏｒｉｔｈｍｓｆｏｒＦａｓｔＰｏｌｙｈｅｄｒｏｎＲａｙ－ＴｒａｃｉｎｇＺｈａｎｇＱｉａｎＳｈｉＪｉａｏｙｉｎｇＣａｉＨｏｎｇＣＡＤ＆ＣＧＳｔａｔｅＫｅｙＬａｂ．，ＺｈｅｊｉａｎｇＵｎｉｖｅｒｓｉｔｙ，３１００２７ＦｏｓｈａｎＥｎｔｅｒｐｒ...     

基于组件特征模型的产品布局设计

本文将产品的布在布局设计过程视为一个组件特征的 布局演化过程，提出了基于组件特征模型的产品布局设计方法，并进行了实例验证。