可水声定位的水下弹载测试系统设计

为了获取水下弹体发射全过程的多通道飞行姿态数据,并且针对水下弹体发射入水后难以搜寻的问题,设计了一种可水声定位的水下弹载测试系统。采用STM32F103C8T6作为主控芯片,控制系统多通道数据采集、存储与超声波脉冲信号的发出。设计了功率放大电路和阻抗匹配电路,提高了系统工作效率。经过测试,加载在换能器上的激励电压峰-峰值达134 V,可驱动换能器发出超声波。实验结果表明,采集系统可以连续高精度地采集弹体全过程飞行数据,在水下3.8 m可探测到目标,达到实际使用要求。

基于SoC的变频率采样策略设计与实现

为提高基于SoC(System-on-Chip)的存储测试仪的灵活性、通用性,设计了一种新型的变频率采样策略.此策略通过分频的方式可产生8种采样频率,以适应不同频带的被测试信号.通过子过程划分的方法,利用触发信号实现对于同一被测参数在一次测试过程中多次调整采样频率的功能.仿真验证结果表明:这种采样策略可实现采样频率与被测信号的适应性.应用这种采样策略的SoC可以扩展所构成测试仪的应用范围,增强其灵活性.

多采样策略ASIC的设计与实现

针对储存测试系统微型化的瓶颈问题,设计了具有多采样策略的ASIC(application specific inte-grated circuit)。该芯片可以根据被测信号的变化规律在一次测试过程中设置多种采样频率,可以有效利用系统有限的储存空间,减少储存芯片的数量。多种采样频率的转换通过触发信号自动完成。采用此ASIC的测试系统不仅在体积微型化方面提供了有效的途径,还提高了ASIC的灵活性,使其具有更加广泛的应用空间。芯片进行了测试和验证,能够达到设计要求,可以进行实际应用。基于此ASIC的存储测试系统比现有存储测试系统体积减小40%～60%。

应用ASLT法预测软面包的货架期

简要介绍食品储存期加速测试法,并采用该方法对某品牌软面包的货架期进行预测。通过检测食品的感官、理化和微生物指标,得到了47℃下的食品货架期为2d,37℃下的食品货架期为6d,由以上数据最后得到20℃下的软面包商业货架期为24d^39d。

Test system for miniature pulse-powered photoelectric invert switch based on CPLD

For electronic piezo gauge used for testing gun chamber pressure, its internal miniature pulse-powered photoelectric invert switch cannot often be powered up normally. To solve this problem, a test system for invert switch is presented to verify the reliability of the invert switch. The test system uses complex programmable logic device （CPLD） to control data acquisition of A/D converter and data storage of external flash memory, and then transmits the acquired data to a computer for data analysis and processing. The test system can provide the required sampling frequency of the signal in high temperature, normal temperature and low temperature environments, and the reliability of the invert switch can be verified according to the signal parameters. The results show that the test system has high precision and the tested invert switch has low power consumption and high reliability.

Design and theoretical analysis of test system for propellants' gas pressure in warhead

Aiming at harsh environment of cluster bombs center tube explosion dispersion and difficulties in installation of traditional test systems,a storage test system based on 16-bit ultra-low power microcontroller MSP430 is designed in order to acquire gas pressure during cluster bombs dispersion.To meet the requirement of low power consumption,the working states of system＇s modules during data acquisition are elaborated and the equation to calculate the gas pressure change during cylindrical center tube opening the hatch is deduced.The field test is conducted and good test results are obtained.

Fuze batterytest system based on negative delay

The paper studies a cycle storage system with fixed capacity to monitor fuze battery＇s working voltage and noise,solving the problems of small capacity and low sample frequency.A 4 MB cycle sampling space is designed by adopting the negative delay technology,which implements the function of recording 4 MB data before triggered and then sequentially recording 50 MB data to ensure that the host computer recovers the voltage and noise data correctly and effectively.Two pieces of Flash work alternately to avoid the time conflict between commands programming and data writing.This method can make efficient use of storage space,recording the information before triggered,therefore it ensures the reliability and validity of the measured data.

应用ASLT法预测婴幼儿米粉保质期

采用储存期加速测试法对婴幼儿米粉的保质期进行预测,通过检测理化、微生物和感官指标,得到了纸盒装、塑罐装、铁听装3种包装形式米粉的保质期在50℃、75%RH的保质期为20 d,在40℃、75%RH为65 d,由以上数据得到在20℃下米粉的保质期为686 d^857 d。

Smart projectile acceleration testing in harsh launch environment

In order to solve the problem of parametric test of smart projectile launch,the launch environment of smart projectile was analyzed.a reasonable and feasible storage testing method was proposed,and a multi-channel test system suitable for the environment was designed.The system was successfully applied to a certain range test,and dynamic parameters such as triaxial acceleration of smart projectile launch environment were acquired.The test results play an important role in the improvements of smart projectile design process.

Design of driving wheel speed test device based on magnetoelectric sensor

In order to study the transmission efficiency of engine and optimize the structure of driving wheel,the rotational speed storage test device of driving wheel in tracked vehicle based on magnetoelectric sensor was designed.The device consisted of a mounting bracket,a sensor and a tester.The mounting bracket was installed in vehicle body after fixing the tester and sensor to mounting bracket beside the driving wheel.Using the storage test instrument,the wireless trigger technology was applied to synchronously record and stored the rotational speed data of the driving wheel in tracked vehicle.After the experiment was finished,the data was read out through the upper computer.Both valid data and satisfactory results were obtained through both simulated and actual vehicle tests.

Design and development of real-time query platform for big data based on hadoop

This paper designs and develops a framework on a distributed computing platform for massive multi-source spatial data using a column-oriented database(HBase).This platform consists of four layers including ETL(extraction transformation loading) tier,data processing tier,data storage tier and data display tier,achieving long-term store,real-time analysis and inquiry for massive data.Finally,a real dataset cluster is simulated,which are made up of 39 nodes including 2 master nodes and 37 data nodes,and performing function tests of data importing module and real-time query module,and performance tests of HDFS's I/O,the MapReduce cluster,batch-loading and real-time query of massive data.The test results indicate that this platform achieves high performance in terms of response time and linear scalability.

An LFSR-based address generator using optimized address partition for low power memory BIST

Power consumption in test mode is much higher than that in normal mode,which is prone to causing circuit damage and reducing the yield of chips.To reduce the power dissipation efficiently,a modified linear feedback shift register(LFSR)is designed to decrease switching activity dramatically during the generation of address sequences for memory built-in self-test(MBIST).The address models are generated by a blend of two address generators with an optimized address partition and two distinct controlled clock signals.An address generator circuit for MBIST of 64 k×32 static random access memory(SRAM)is designed to illustrate the proposed scheme.Experimental results show that when the address bus size is 16 bits,compared with the traditional LFSR,the proposed LFSR can reduce the switching activity and dynamic power by 71.1%and 68.2%,respectively,with low area overhead.

Effects of Temperature, Relative Humidity and Moisture Content on Seed Longevity of Shrubby Russian Thistle （ Salsola vermiculata L,）

Salsola vermiculata is a highly palatable shrub and widely used in rangeland rehabilitation programs, but has short seed longevity. To identify the most cost effective storage method for S. vermiculata, experiments were carried out to test the effects of fruit bracts （wings）, temperature regimes, seed moisture and packaging methods on storage life. Seed samples were removed from storage at monthly intervals for testing and towards the end of the experiments samples were transferred from hermetic to ambient storage conditions and tested for germination. Experiment 1 continued for 1,140 days, Experiment 2 for 720 days. For de-winged seed, high moisture content increased seed longevity, suggesting that desiccation susceptibility is one of the causes of limited longevity in this species. Most longevity regression lines of winged seeds had negative intercepts suggesting increase in germination resulting from gradual dormancy-breaking. Drying and packaging alone increased longevity by 7.6 and 3.8 times in Experiments 1 and 2, respectively. Samples kept at lower temperature and lower moisture treatments survived longer under ambient conditions. Increased longevity by drying and vacuum packaging alone can provide simple, cost effective and environmentally friendly options for rangeland rehabilitation programs.

Investigation of Excessive Material on Insulating Properties Using Different Heat Transfer Fluid for Thermal Energy Storage Development

Though TES （thermal energy storage） is developed hugely in most of the solar power generation plants, it is less growth in implementing a modular type of TES in a solar plant, e.g., solar dish/stifling engine application. The main issue in designing the TES system is its thermal capacity of storage materials, e.g., insulator. This study is focusing on the potential waste material as an insulator for thermal energy storage applications. The insulator usage is to reduce the heat transfer between two mediums and the capability is measured by its resistance to heat flow. It is needed to obtain optimal materials to energy conversion at the same time reduce the waste generation. Therefore, a small-scale experimental testing of natural cooling process of an insulated tank within a confined room without any forced cooling system, e.g., fan. The testing is repeated by changing the insulator using the potential waste material from natural and industrial waste and also by changing the HTF （heat transfer fluid）. The analysis is performed on the relationship between heat loss and the reserved period by the insulator. The results indicate the percentage of period of the insulated tank withstands the heat compared to non-insulated tank, e.g., cotton reserved the period of 14% more than non-insulated tank to withstand the heat transfer of cooking oil to the surrounding. The paper finally justifies the most potential waste material as an insulator in different heat transfer fluids.

应用ASLT法预测压片型含化烟保质期

参照国外含化烟及国内压片型糖果制品的工艺配方,研究制备一款柠檬味含化烟产品,该款含化烟以糖醇和烟草为主要原料,通过添加一定比例的调味剂和着色剂,经灭菌、造粒和压片制备而成。采用储存期加速测试法(ASLT)对该款含化烟制品的保质期进行预测,通过检测理化、微生物指标和感官评价,得到塑圆盒装压片型含化烟在55℃、RH 65%的条件下保质期为12 d,在45℃、RH 65%条件下保质期为40 d,根据数据预测塑圆盒装压片型含化烟在25℃、RH 65%常规环境下的保质期约444 d。

蒲公英牛奶咀嚼片的研制及性质

以蒲公英超微粉和牛奶粉为主要原料,采用干法压片工艺,研制一款蒲公英牛奶咀嚼片。通过单因素试验、正交试验探究咀嚼片的最佳配比。采用储存期加速测试法(ASLT),以感官评分为标准,预测产品的保质期。通过测定色差、硬度、水分等因素变化情况,探究产品的贮藏稳定性。经试验确定:最佳工艺为原料最佳粒度0.075mm、压片设备预压厚度3.2 cm;产品最佳配比为牛奶粉45%、蒲公英粉10%、冰糖粉︰甘露醇比例7︰3、柠檬酸2%、硬脂酸镁2%。泡罩包装成品在25℃、相对湿度(RH) 65%的商业贮藏条件下保质期为128 d。该试验为片剂产品的生产和贮藏提供科学指引,为高寒地带蒲公英资源和乳资源的整合开发提供新思路。

黄瓜猕猴桃超微粉咀嚼片的研制

以黄瓜和猕猴桃超微粉,辅以牛奶粉,采用直接压片法,研制黄瓜猕猴桃超微粉咀嚼片。通过多次单因素试验和正交试验确定该咀嚼片的最佳配方:黄瓜超微粉30%、猕猴桃超微粉10%、奶粉50%、甘露醇1%、冰糖粉1%、麦芽糊精6%、硬脂酸镁2%。采用储存期加速测试法(ASLT),以感官评定为指标,预测出产品在25℃、相对湿度(H_(R)) 65%的商业贮藏条件下保质期为81 d。试验结果为黄瓜、猕猴桃类片剂的生产和贮藏提供理论依据。

TextGen： a realistic text data content generation method for modern storage system benchmarks

Modem storage systems incorporate data compressors to improve their performance and capacity. As a result, data content can significantly influence the result of a storage system benchmark. Because real-world proprietary datasets are too large to be copied onto a test storage system, and most data cannot be shared due to privacy issues, a benchmark needs to generate data synthetically. To ensure that the result is accurate, it is necessary to generate data content based on the characterization of real-world data properties that influence the storage system performance during the execution of a benchmark. The existing approach, called SDGen, cannot guarantee that the benchmark result is accurate in storage systems that have built-in word-based compressors. The reason is that SDGen characterizes the properties that influence compression performance only at the byte level, and no properties are characterized at the word level. To address this problem, we present TextGen, a realistic text data content generation method for modem storage system benchmarks. TextGen builds the word corpus by segmenting real-world text datasets, and creates a word-frequency distribution by counting each word in the corpus. To improve data generation performance, the word-frequency distribution is fitted to a lognormal distribution by maximum likelihood estimation. The Monte Carlo approach is used to generate synthetic data. The running time of TextGen generation depends only on the expected data size, which means that the time complexity of TextGen is O（n）. To evaluate TextGen, four real-world datasets were used to perform an experiment. The experimental results show that, compared with SDGen, the compression performance and compression ratio of the datasets generated by TextGen deviate less from real-world datasets when end-tagged dense code, a representative of word-based compressors, is evaluated.

Revealing interfacial space charge storage of Li^(+)/Na^(+)/K^(+)by operando magnetometry

Interfacial space charge storage between ionic and electronic conductor is a promising scheme to further improve energy and power density of alkali metal ion batteries(AMIBs).However,the general behavior of space charge storage in AMIBs has been less investigated experimentally,mostly due to the complicated electrochemical behavior and lack of proper characterization techniques.Here,we use operando magnetometry to verify that in FeSe_(2)AMIBs,abundant Li^(+)/Na^(+)/K^(+)(M^(+))can be stored at M_(2)Se phase while electrons accumulate at Fe nanoparticles,forming interfacial space charge layers.Magnetic and dynamics tests further demonstrate that with increasing ionic radius from Li^(+),Na^(+)to K^(+),the reaction kinetics can be hindered,resulting in limited Fe formation and reduced space charge storage capacity.This work lays solid foundation for studying the complex interfacial effect in electrochemical processes and designing advanced energy storage devices with substantial capacity and considerable power density.

The Study of Latent Heat Transport Characteristics by Solid Particles and Saccharide Solution Mixtures

The purpose of this study is the development of latent heat transport system by using the mixture of the minute latent heat storage materials and the saccharine solution as medium. The experimental studies are carried out by the evaluation of viscosity and pressure loss in a pipe. Polyethylene (P.E.) is selected as the dispersed minute material that has closeness density (920kg/m3) of ice (917kg/m3). D-sorbitol and D-xylose solutions are picked as continuum phase of the test mixture. The concentration of D-sorbitol solution is set 48mass% from measured results of saturation solubility and the melting point. 40mass% solution of D-xylose is selected as the other test continuum phase. The non-ion surfactant, EA157 Dai-ichiseiyaku CO. Ltd, is used in order to prevent of dispersed P.E. powder cohere. The pressure loss of test mixture is measured by the straight circular pipe that has smooth inner surface. The measuring length for pressure loss is 1000 mm, and the inner diameter of pipe is 15mm. The accuracy of experiment apparatus for measuring pressure loss is within ±5%. The pressure loss data is estimated by the relationship between the heat transport ratio and the required pump power. It is clarified that the optimum range of mixing ratio exists over 10mass% of latent heat storage material.