气流式加速度传感器的敏感机理

介绍了在研制气流式加速度传感器过程中，为对气流式加速度传感器进行建模，作者对气流式加速度传感器的工作机理进行了理论性探讨。在分析过程中以流体力学、传热学和惯性理论为基础并结合实验结果，建立了适合于气流式加速度传感器的气体运动方程和能量方程。同时还讨论了热线测量加速度的方法及根据实验分析了输入加速度对腔体内温度及传感器输出电压的影响，从而为进一步研究一系列气流式传感器的工作机理提供了方法。     

On the dissipation process in Bi2Sr2Ca2Cu3O10 tapes and bulk samples with preferential grain orientation in zero external magnetic field

Current-voltage characteristics of Bi₂Sr₂Ca₂Cu₃O₁₀ tapes and bulk samples with preferentially oriented crystallites have been measured in zero applied magnetic field and for temperatures close to the mean-field critical-temperature,T _c0. It was shown that the power-law dependence,V=AI ^a, valid for two-dimensional systems, does not correctly describe the data, which clearly indicate the existence of a finite critical-current density,J _c. The experimentalI-V curves are fitted quite well with the model which attributes the finite critical-current density to the coupling between the CuO₂ double layers. It was found thatJ _c vanishes at a temperature value belowT _c0. This behavior can result from the occurrence of vortex fluctuation-induced layer decoupling and/or from the contribution of entropy to the vortex unbinding process.     

基于能效逻辑的绿色数据中心定量评估方法探究

数据中心绿色化建设的最主要的核心目标是降低能源消耗.本篇论文提出了基于能效逻辑的绿色数据中心定量评估方法.先来描述能效逻辑的使用过程;然后在提出如何让定量评估来实现的二种指标.     

农田水分监测传感器网络MAC协议研究

传统的基于时分复用协议不能直接适用于大规模农田水分监测传感器网络部署需求.根据农田土壤水分监测系统的应用,设计了一种基于路径唤醒的时分复用调度协议PW-TDMA,包括时序结构、数据包格式、调度机制,并对协议进行时延和能耗分析.通过实例分析和实验表明,在网络拓扑固定和低通信量环境下,本协议能降低能耗、延长网络生命周期.     

基于GM(1,1)模型和模拟退火算法的中长期负荷预测

分析了灰色模型(GM)和模拟退火模型(SA),GM(1,1)学习参数的计算采用最小二乘法,而最小二乘法是基于残差平方和最小寻优,容易陷入局部最小,对于非线性较强的负荷,会产生很大的偏差。提出了一种GM(1,1)与SA相结合的方法,根据模拟退火原理,结合概率突跳特性在解空间中随机寻找目标函数的全局最优解,自动优化GM(1,1)的参数,在负荷预测的实例中取得良好效果。     

海底PE管道边敷边埋施工技术研究——大连长山岛～皮口海底PE管道敷埋施工技术研究

为满足目前我国管线最长、口径最大的钢丝网缠绕高密度聚乙烯复合管(PE)海底输水工程的需要,阐述了自行研制开发的敷管船、托管架和埋设机连在一起的边敷边埋施工工艺,适用水深在30m以内浅海软土地基海域,具有敷埋时间短、对施工海域影响小、成本低等优势。     

Adaptive dynamic range shift (ADRIFT) quantitative phase imaging

Quantitative phase imaging(QPI)with its high-contrast images of optical phase delay(OPD)maps is often used for label-free single-cell analysis.Contrary to other imaging methods,sensitivity improvement has not been intensively explored because conventional QPI is sensitive enough to observe the surface roughness of a substrate that restricts the minimum measurable OPD.However,emerging QPI techniques that utilize,for example,differential image analysis of consecutive temporal frames,such as mid-infrared photothermal QPI,mitigate the minimum OPD limit by decoupling the static OPD contribution and allow measurement of much smaller OPDs.Here,we propose and demonstrate supersensitive QPI with an expanded dynamic range.It is enabled by adaptive dynamic range shift through a combination of wavefront shaping and dark-field QPI techniques.As a proof-of-concept demonstration,we show dynamic range expansion(sensitivity improvement)of QPI by a factor of 6.6 and its utility in improving the sensitivity of mid-infrared photothermal QPI.This technique can also be applied for wide-field scattering imaging of dynamically changing nanoscale objects inside and outside a biological cell without losing global cellular morphological image information.     

GYR1型电子式光学测风经纬仪的使用与维护

GYR1型电子式光学测风经纬仪是集光、机、电于一体,利用光电技术测角,带有角度数字显示和进行数据自动归算及存储装置的经纬仪。本文简要介绍了GYR1型电子式光学测风经纬仪的组成及主要功能,并总结归纳了在操作中的使用技巧和注意事项、容易出现的问题及其处理方法。     

Biological properties of carbon/carbon implant composites with unique manufacturing processes

The goal was to manufacture carbon/carbon (C/C) composites through a unique procedure with improved biocompatibility and reduced debris release. C/C composites were prepared by chemical vapor deposition, and their biological properties were analyzed. With regard to mechanical properties, compressive strength/modulus was 219.1 MPa/9.72 GPa, flexural strength/modulus was 121.63 MPa/21.9 GPa, and interlaminar sheer was 15.13 GPa. Biocompatibility testing revealed: (1) the extract liquid from the C/C composites had no effect on cell proliferation; (2) the extract had no impact on micronucleus frequency as compared with the control groups (P > 0.05); (3) in vivo, there was mild tissue inflammation after implantation within the first 2 weeks, but there was no significant difference compared with the control group (P > 0.05); (4) the implants were well integrated into the host tissue, and debris was limited. The tested samples have excellent biocompatibilities and reduced release of debris. The demonstrated changes in manufacturing procedures are promising.