U盘存储器的故障处理及数据恢复的若干办法

U盘使用过程中常出现硬件损坏和软件故障,硬件方面主要有供电电源不足、晶振损坏和主控芯片损坏等问题;软件故障有U盘无法识别、数据无故丢失、文件被误删除或U盘被误格式化。经验表明,U盘不能正常被识别的问题大部分由是软件故障引起的,通过专业的工具软件可解决这类问题,甚至恢复已经丢失的数据。     

原子实的极化和轨道贯穿的多媒体课件制作

文章用Power Point阐述原子实的极化和轨道贯穿的理论,并用Flash动态的演示了原子实的极化和轨道贯穿的过程.     

动态三维图形在Flash中的实现

介绍了三维图形坐标变换的基本原理 ,以及如何通过投影变换实现在屏幕上的显示 .结合动画制作软件Flash具体阐述了实现程序 ,初步探讨了Flash新增函数功能的具体应用和注意事项。     

Pyrolysis behavior of pectin under the conditions that simulate cigarette smoking

In this paper, the formation mechanism of pyrolysis gases released during the pyrolysis of pectin under the conditions that simulate cigarette smouldering was investigated by thermogravimetric analysis coupled to Fourier transform infrared spectrometer (TG-FTIR). Moreover, the combustion behavior of pyrolysis gases was studied by micro-scale combustion calorimetry (MCC). TG-FTIR results illustrated that the composition of the gaseous products was mainly composed of CO₂, H₂O, CO, methanol, methane and carbonyl compounds. MCC results demonstrated that the combustion of pectin was mainly determined by the prolysis gases formed in the temperature range of 200-300 °C. Flash pyrolysis experiment in combination with high performance liquid chromatography (FPy-HPLC) was used to study the pyrolytic formation of eight carbonyl compounds (i.e. formaldehyde, acetaldehyde, acetone, acrolein, propionaldehyde, crotonaldehyde, methyl ethyl ketone and butyraldehyde) during the pyrolysis of pectin under the pyrolysis conditions of cigarette puffing. Results demonstrated that pyrolysis temperature influenced the formation of acetaldehyde, acrolein, propionaldehyde and butyraldehyde greatly, while nitrogen flow affected the generation of formaldehyde, acetone, crotonaldehyde and methyl ethyl ketone deeply.     

Flash ActionScript2.O在生产受控管理平台中的应用

引入一种全新的Web应用程序,在介绍专业互动多媒体网络地图及某公司生产受控管理平台项目特点的基础上,分析了Flash ActionScript2.0在生产受控管理平台中的应用解决方案,简要介绍了面向对象分析与设计,重点论述了与0RACLE数据库进行数据交换的理论基础和实现方法,以及操作图页面的实现.     

Unexpected Formation of Previously Unknown Cyclohex‐2‐enone Derivative via Carbonyl‐ene‐Synthesis at Room Temperature

Abstract

The unexpected formation of 6‐methyl‐2‐(2‐methylpropenyl)cyclohex‐2‐enone (6) during a deprotecting reaction of 1,3‐dioxane (5) via an interesting carbonyl‐ene reaction at room temperature with original aim to obtain 4,8‐dimethyl‐5‐oxonon‐6‐en‐1‐al (4) is reported. An alternative route to aldehyde (4) is also presented.     

闪光X射线衍射成像系统设计及实验方法

为实现材料在冲击加载下微观动力学响应测量,基于小型闪光X射线源开展衍射成像系统设计.利用直流X光机及高纯锗探测器实现系统衍射光路的精确调节,克服了闪光X射线瞬时强度高及连续辐射本底强导致的衍射角度确定困难,并采用Scandiflash AB公司TD-450S和成像板建立了衍射成像系统.应用该系统在冲击加载实验中获得了LiF单晶单脉冲的Mo-Kα线静态及动态衍射图像.该闪光X射线衍射系统时间分辨率可达25ns,为冲击压缩实验中材料瞬时结构变化测量提供了新的实验方法.     

Modeling of programming time of nanocrystal flash memory cells

Charging dynamics of nanocrystals in the emerging silicon nanocrystals-based flash memory is explained using a simplified engineering model based on effective mass approximation. The model includes the presence of discrete energy levels in the nanocrystals and also the effect of shift in energy levels in the nanocrystals with more than one electron. The simulated results of shift in threshold voltage as a function of programming time, and the effect of gate voltage and drain voltage on the programming speed agree very well with the experimental results. The tunnel mass of electron in the oxide, which is used as a fit parameter, takes into account the effect of strain and crystallographic orientational effects. Assumptions and limitations of the model are discussed.     

在Flash课件中使用传感器

利用Arduino、学校现有的传感器和Flash动画来开发DisLab,使Flash课件摆脱了只能模拟的缺点,也使DisLab有了更友好的显示界面．利用Arduino和Flash能创造出更多具有个性化的课件,也可以实现在Flash动画端来控制现实的实验,为物理教学带来了新的教学手段．     

爆炸闪光脉冲波形实时采集与存储系统

介绍了一种针对爆炸时刻的测量而设计的爆炸波形实时采集与存储系统.该系统通过可编程逻辑阵列控制模数转换器的时序来完成数据实时采集,同时将采集到的数据实时存储到闪速存储器中.数据采集存储结束后,后系统通过PC/104总线传至PC/104计算机以便进行数据的后续处理获得完整的爆炸波形来判断爆炸时刻.