MEMS传感器的封装

首先通过对MEMS封装所面临的挑战进行分析,提出了MEMS封装所需要考虑的一些问题。然后从芯片级、晶片级和系统级三个方面详细介绍了倒装焊、BGA、WLP、MCM和3D封装等先进的封装技术,并给出了一些应用这些封装方式对MEMS系统封装的实例。最后对MEMS和MEMS封装的走向进行了展望,并对全集成MEMS系统的封装进行了一些探讨。     

基于子空间对齐与自适应CSP算法的运动想象脑电信号分类

在脑机接口中,让分类器从一个用户适应到另一个用户是具有挑战性的,但对于减少新用户的训练时间是必要的.但由于每个个体的神经信号存在着差异,常用的特征提取方法训练的分类器,应用于不同的用户时,准确率很低.因此本文提出了一种新的自适应共空间模式的特征提取方法,该算法通过选择合适的候选试验更新协方差矩阵,然后对提取的特征进行子...     

芯片封装技术的发展演变

介绍了芯片封装技术的发展演变与未来的芯片封装技术。从中可以看出芯片技术与封装技术相互促进、协调发展密不可分的关系。     

多芯CSP-LED芯片间距对热拥堵的影响

在铝基板上贴片了不同间距的四颗芯片级封装发光二级管(CSP-LED)模组,测试了不同贴片间距CSP-LED模组的EL光谱、流明效率、光通量、相关色温等光电参数。结果显示,在小电流(20~400 mA)下,随着注入电流的增大,不同排布间距的蓝、白光样品的光电性能基本呈现相同的变化规律,即光通量、光功率呈线性增长,光效基本保持稳定;在大电流(1~1.5 A)下,随着芯片间排布间距减小,EL光谱积分强度降低,色温升高,红色比下降,排布间距为0.2 mm的光通量衰减了84.58%,相比之下排布间距为3 mm和5 mm的光通量衰减明显减缓,分别为8.96%和3.58%,这些现象与禁带宽度、热应力、非辐射复合等因素有关。结果表明,CSP白光LED光通量衰减主要是荧光粉退化导致的,考虑到实际生产成本问题,排布间距为3 mm时,有利于热量散出,进而提高LED光电性能特性及其自身的使用寿命。     

Enantioseparation of vesamicol and novel vesamicol analogs by high-performance liquid chromatography on different chiral stationary phases

High-performance liquid chromatography enantioseparation of vesamicol and six novel azaspirovesamicols (amino alcohols) was accomplished on different chiral stationary phases (CSPs) by using an optical rotation based chiral detector for identification of the resolved enantiomers. The Pirkle-type column Reprosil Chiral-NR was found to be most suitable for chiral resolution in normal phase (NP) mode; all compounds could be enantioseparated successfully. Also the cellulose-based column Reprosil Chiral-OM showed appropriate separation properties by using NP conditions. The amylose-type column Reprosil Chiral-AM-RP was most suitable for enantioseparation in reversed phase (RP) mode; five out of seven compounds were resolved. This CSP showed a considerably higher capability for chiral recognition of vesamicol derivatives in RP mode than the corresponding cellulose-based column Reprosil Chiral-OM-RP. Enantioseparation with the teicoplanin aglycone-based column Reprosil Chiral-AA was successful under polar ionic mobile phase conditions.     

Relaxation of concentration perturbation in chemical kinetic systems

In a linear approximation, the relaxation of a concentration perturbation can be described by a matrix exponential, which can be evaluated using Jordan decomposition. In time-scale analysis, this approach has advantages when the Jacobian has degenerate eigenvalues, which may occur when the mechanism contains identical rate constants, characteristic to tropospheric chemistry and low-temperature combustion.     

基于OMA IMPS协议的手机终端IM研究与设计

本文根据目前OMA(Open Mobile Alliance,开放移动联盟)对群组,Presence及消息类业务的协议规范,介绍了OMA IMPS体系结构、CSP协议、以及消息封装格式.其中重点对SMS消息封装进行了介绍和研究,提出了基于OMA IMPS协议SMS消息封装的移动终端即时通讯设计方案,并对其可行性进行了评估.     

稀土CSP低碳钢薄板退火过程中组织演变及微区取向研究

利用金相显微镜和背散射电子衍射（EBSD）技术研究了稀土对CSP低碳钢冷轧薄板退火过程中组织和织构的影响。试验结果表明：稀土CSP低碳钢冷轧板在罩式退火过程中加热到580℃时开始发生再结晶,经过680℃保温9 h,形成均匀的饼型晶粒;稀土的加入促进{111}〈110〉和{111}〈112〉晶粒的生长,增加了{111}有利织构的强度。     

Analytical and semi‐preparative enantioresolution of (RS)‐ketorolac from pharmaceutical formulation and in human plasma by HPLC

An efficient, simple, validated, analytical and semi‐preparative HPLC method has been developed for direct enantioresolution of (RS)‐Ketorolac (Ket) using monochloro‐methylated derivatives of cellulose and amylose, i.e. cellulose (tris‐3‐chloro‐4‐methylphenylcarbamate) and amylose (tris‐5‐chloro‐2‐methylphenylcarbamate) as chiral stationary phases (CSPs) with photo diode array detection at 320 nm. Enantioresolution was carried out in samples of human plasma spiked with (RS)‐Ket under normal and reversed‐phase elution modes with suitable mobile phase compositions. The effect of nature of alcohols (MeOH, EtOH, PrOH and n‐BuOH) and other solvents (MeCN and MeOH) as organic modifiers in the mobile phase was investigated on the separation performance of two CSPs in terms of retention and separation of enantiomers. The best resolution was observed on cellulose‐based CSP using EtOH, while using 2‐PrOH (15%) and amylose‐based CSP obtained the highest retention. Under reversed‐phase elution mode the best enantioseparation was observed using 30% MeCN with ammonium formate buffer. The elution order of enantiomers was ascertained by determining specific rotations. The limit of detection and quantitation values were 5 and 15.5 ng/mL for each enantiomer of (RS)‐Ket, respectively. Copyright © 2016 John Wiley & Sons, Ltd.     

基于无线通信的ASK协议的建模分析

安全协议的建模分析与设计一般采用形式化的方法进行,这是许多经典安全协议存在的缺陷。因此,文章提出采用形式化验证的方法对一种复杂的无线移动安全协议-ASK协议进行建模和验证,针对ASK协议所存在的缺陷,我们提出了改进之后的协议,并对改进后的协议进行了验证,结果表明,新的协议是安全的,是能够抵御重放攻击的。