A new method for recovering valuable metals from low-grade nickeliferous oxide ores

A new method, the concentrated sulfuric acid acidolysis and water leaching (SAWL) of nickeliferous oxide ores, is proposed and the optimal conditions for recovery of nickel, cobalt and copper from a low-grade Chinese nickeliferous oxide ore are presented. A series of experiments were conducted which examined the effect of acid charge, acid curing temperature and acid curing time. Recoveries of up to 95%, 83% and 95% for Ni, Cu and Co, respectively were obtained with only the sulfuric acid at ambient temperature and atmospheric pressure. Comparing the percolation leaching with agitation leaching showed that percolation leaching was capable of extracting the valuable metals with water. The SAWL method was scaled to three-stages counter-current leaching tests using 1 kg of ore. The results indicate greater than 90% extraction for nickel and cobalt.     

Using Finite-Element Method to Simulate Wave Transformations in Surf Zone

In this study, a finite element method proposed by Hsu et al. in 2003 is extended to develop a numerical model for the simulation of wave transformation in the surf zone. The governing equation is the elliptic mild-slope equation including the energy dissipation of wave breaking. At the open boundaries with varying depth, the reflected waves caused by shoaling are adopted to the radiation boundary conditions. The rationality of the present numerical model is examined through the cases of offshore parallel breakwater problems. The results of calculation are in good agreement with experimental results.     

BES漂移室丝的实验研究

抽样检测了北京谱仪(BES )漂移室(DC)将要使用的镀金钨丝和镀金铝丝的极限张力,发现同批不同轴丝之间极限张力有较大差别。测量了丝的蠕变效应,得到蠕变效应修正系数。为找出合适的镀金铝丝夹丝固定参数,对铝铜两种不同材料夹丝管需研制各自专用夹丝工具。     

碱渣中二价硫及硫醇的测定(硝酸银电位法)

在石油炼制过程中产生的碱渣污水,成份复杂,氧化性、还原性及重金属等其他干扰性物质复杂而难以确定,测定二价硫及硫醇时,用常规的方法去除干扰再用碘量法或比色法分析难以进行。采用电位滴定法,可以有效地测定碱渣中的二价硫和硫醇,并且通过大量的实验,找出了适合测定我公司石油炼制中产生的碱渣污水中二价硫和硫醇的特有规律。     

传感器的测试技术

本文介绍了以VFP6．0软件，应用在Insb伪币检测传感器中，实现了电脑对传感器的阻值进行自动检测和排序，大大地提高了生产效率，达到理想效果。     

SMS有奖问答游戏的设计与实现

介绍在Linux平台上利用Java语言开发的通过GSM Modem发送的SMS有奖问答游戏软件的设计过程和实现方法。     

面向控制应用的TCP/IP协议设计与实现

首先分析了面向控制应用TCP/IP协议的特点，随后阐述了两种针对专用控制网络的以太网网关实现方案，即MCU或DSP 以太网网络接口的TCP/IP实现、基于嵌入于式PC和实时操作系统的TCP／IP实现，并且对比了这两种方案的优缺点。还通过具体的实例，说明其实现的思路和技术要点。最后总结了TCP／IP协议向底层控制网络延伸及当前存在的问题和解决方法。     

在Intranet中实现电源系统的控制

文章介绍了电源控制系统在以太网中的设计与实现。为了完成在以太网中对电源实施控制和实时监控,采用了COM组件技术和服务技术。借助于组件,允许拥有一定权限的用户从Intranet上直接对多个电源进行远程控制,采用服务实时监控电源状态,将运行情况提交于远端数据库,进行数据交换并提取数据改变电源的运行。在实现控制的过程中,采用了ADO访问远端数据库,WMI访问外部设备。     

基于统计分析与概率计算的邮件循环检测算法研究

分析了邮件循环的产生因素及传统的检测方法，建立了基于邮件会话中来源与目的的统计模型，研究了会话时间序列的统计特性，据此计算各来源目的对的循环概率值，提出了一种新颖灵活的邮件循环检测算法．     

基于Walsh变换的汉语非特定人语音识别的研究

运用Walsh变换对语音信号进行分析,得到了语音信号的Walsh域特征——2D自由度功率谱特征。利用此特征采用神经元网络法对汉语数字音0～9进行不定人语音识别,结果表明,该特征不仅能给出足够的识别信息,而且由于Walsh变换只有加/减运算,因而在识别速度方面比常用的频域特征有明显提高。