IT监理如何腾飞？

随着国内信息化进程的飞速发展，信息系统工程监理（又称IT监理）正在被逐渐接受和应用，并发挥着越来越重要的作用。基于当前我国IT监理行业的状态，结合监理行业在国内的发展历程，笔者对于如何促进IT监理业快速发展，使IT监理公司在信息化工程中发挥更大作用，有以下几点见解。     

中国电解金属锰出口市场浅析

对电解金属锰从2000～2006年的市场形势作了认真分析，特别对该产品出口市场的价格走势进行了比较。     

天麻酵素的发酵工艺优化与品质评价

以天麻粉为原材料制备天麻酵素,通过单因素试验结合响应面试验优化天麻酵素发酵条件,并评价发酵处理对天麻品质的影响。结果表明,天麻酵素的最佳发酵工艺条件为发酵剂用量0.3%、糖添加量11%、发酵温度35 ℃、发酵时间14 d。此优化条件下制得的天麻酵素具有一定的功能性成分和抗氧化活性,天麻酵素中对羟基苯甲醇的含量为0.69 g/L,功能性成分γ-氨基丁酸、对羟基苯甲醛含量分别为0.010 4 mg/mL、0.023 mg/mL,1,1-二苯基-2-三硝基苯肼（DPPH）自由基清除率、超氧化物歧化酶（SOD）活力、总抗氧化能力（T-AOC）分别为82.37%、5.31 U/mL、2.19 μmol/mL。天麻酵素颜色呈橙红色、体系透明、香气浓郁、滋味协调。     

硬脂酸凝胶法制备纳米TiO2的XRD研究

用硬脂酸凝胶法成功制备了TiO2纳米晶,对不同温度下热处理的系列粉末用X射线粉末衍射（XRD）进行了研究,发现所得纳米TiO2粉晶随热处理温度的不同,发生了从锐钛矿到金红石相的转变,而且随着热处理温度的升高,粉末晶粒增大,利用硬脂酸法能在较低温度500℃得到金红石结构,较一般的溶胶－凝胶（sol-gel）法的晶型转变温度低。     

聚甲基丙烯酸丁酯热稳定性研究

以聚乙烯醇(PVA)为分散剂、过氧化苯甲酰(BPO)为引发剂,采用悬浮聚合法合成甲基丙烯酸丁酯(BMA)和苯乙烯(St)的共聚物P(BMA-St)。利用傅里叶红外光谱仪、核磁共振波谱仪、热失重分析仪对产品化学结构进行表征。研究了St加入量对聚甲基丙烯酸丁酯(PBMA)热稳定性的影响。采用Kissinger热分解动力学模型对BMA和含质量分数40%St的P(BMA-St)进行研究,结果显示:P(BMA-St)在空气和氮气气氛下的反应活化能(E)分别为97.914,107.325kJ/mol,而PBMA在空气气氛和氮气气氛下的E分别为61.543,76.992kJ/mol,可见St的加入提高了PBMA的热稳定性。     

Purification process of coal-based coke powder as anode for Li-ion batteries简

A process of purification of coal-based coke powder as anode the treatment of coke powder with dilute hydrofluoric acid solution, for Li-ion batteries was attempted. The process started with followed by united-acid-leaching using sulfuric acid and hydrochloric acid. The effects of altering the hydrofluoric acid addition, hydrofluoric acid concentration, contact time, temperature and acid type were investigated. A minimum ash content of 0.35% was obtained when proper conditions were applied. The electrochemical performance of purified coke powder shows greatly improved electrochemical performance. The as-purified coke powder presented an initial reversible capacity of 257.4 mAh/g and a retention rate of 95% after 50 cycles. The proposed purification process paves a way to prepare a promising anode material with good performance with low cost of coke powder for Li-ion batteries.     

64通道雷达同步高速数据采集系统的设计与测试

本文主要根据雷达系统中对于数据采集的高速性进行相关方案的介绍,通过利用以多个工控机为基础的系统构架的设计,对64通道、100MSPS的采样,对于同步数据的采集精度达到了8bit,通过测试发现这一系统在数据同步方面其性能也有明显的优势,下面就具体对64通道雷达同步高速数据采集系统的设计与测试进行具体研究.     

Capacitance sensor for automatic soil retreat measurements

To continuously monitor the soil retreat due to erosion in field, provide valuable information about the erosion processes and overcome the disadvantages of inefficiency, high time-consumption and labor-intensity of existing methods, this paper describes a novel capacitance sensor for measuring the soil retreat. A capacitance sensor based probe is proposed, which can measure the depth of the soil around it automatically and the data can be recorded by a data logger. Experimental results in the lab verify its usefulness.     

Pekeris波导中侧面波矢量场

侧面波作为近距离声场的重要成分,因其现有近似公式误差过大而给近距离声场分析和预报引入较大误差.针对Pekeris波导,在推得矢量场积分公式基础上,经严格的围道积分分析,推得侧面波矢量场积分公式,并对其设计了快速数值积分算法.该算法将侧面波原来的计算精度提高了1～2个数量级.数值分析表明,侧面波声压场与矢量场具有相近的衰减规律:相对于海深的近距离内,衰减率接近球面波;中等距离衰减率近3倍于球面波;远距离衰减率2倍于球面波.在几倍于海深的距离内,侧面波占总声场的主要成分.海试结果与声场理论预报接近,初步验证了该算法的正确性.