Two Processes Comparison by Using Capability Indices C_(pm)

In recent years, there has been mounting interest i n measuring process performance in manufacturing industry. Based on analyzing the process capability indices, a production department can trace and improve a poor process to enhance quality levels and satisfy customers. The process capabilit y analysis can also serve as an important reference for making decisions for imp roving the global quality of all products. Since C p and C pk are failed to account for process centering, the index C pm is developed. The index C pm takes the process centering into consideration and is su itable for the processes with nominal-the-best type. There are other indices l ike C pu and C pl, and those indices are used for unilateral s pecification processes. Chou (1994) developed a procedure using estimators of C p, C pu and C pl for practitioners to determine whether two p rocesses are equal capability or not. For bilateral specifications processes, i ndex C p is failed to measure process yield and process centering. Thus, th e index C pm is used to develop a similar procedure for practitioners t o determine whether two processes are equal capability or not. The decisions mad e using the procedure to select the better supplier are, of course, more reliabl e.

Ultrafine milling for the processing of gold-bearing sulphides

Ultrafine Milling technology is used to treat gold-bearingsulphides and to investigate the effects of minerals size, millingtime, liquid/solid ratio, NaCN consumption and leaching aid onleaching rate of gold. The results indicate that shorter treatingtime, decrease of NaCN consumption of 60/100 and increase of goldleaching rate of 15/100 can be ob- tained by the ultrafine millingtechnology compared with traditional cyanide leaching. Potentialexists for the new pro- cess to form the basis for an economicallyprocess for treatment of gold-bearing sulphides.

Information Fusion for Process Acquisition in the Operating Room

The recognition of surgical processes in the operating room is an emerging research field in medical engineering. We present the design and implementation of a instrument localization system that is based on information fusion strategies to enhance its recognition power. The system was implemented using RFID technology. It monitored the presence of surgical tools in the interventional site and the instrument tray and combined the measured information by applying redundant, complementary, and cooperative information fusion strategy to achieve a more comprehensive model of the current situation. An evaluation study was performed that showed a correct classification rate of 97% for the system.

Microstructure evolution of processed Mg-Al-Zn alloy by equal channel angular extrusion in semi-solid isothermal treatment

Microstructure evolution of processed Mg-Al-Zn alloy by equal channel angular extrusion(ECAE)in semi-solid isothermal treatment was investigated.The results show that with increasing semi-solid isothermal treatment temperature,the α phase solid grain size of processed Mg-Al-Zn alloy by ECAE increases firstly due to coarsening of α phase solid grains,then decreases due to melting of α phase solid grains.With the increase of extrusion passes during ECAE,the α phase solid grain size in the following semi-solid isothermal treatment decreases.The α phase solid grain size of processed Mg-Al-Zn alloy by ECAE under route BC is the smallest,while the α phase solid grain size of processed material by ECAE under route A is the largest.The primary mechanism of spheroid formation depends on the melting of recrystallizing boundaries and diffusion of solute atoms in the semi-solid state.

EFFECT OF SOIL MOISTURE-ENERGY DISTRIBUTION AND MELTING-FREEZING PROCESSES ON SEASONAL SHIFT IN TIBETAN PLATEAU

As one of the major projects of GAME (GEWEX Asian Monsoon Experiment), the GAME\|Tibet aimed to mainly examine the energy and water cycle in Tibetan Plateau and its effects on Asian monsoon. In this paper, based on the in\|situ high\|resolution observation data of GAME\|Tibet, the soil energy\|moisture distribution and the melting\|freezing progresses and their effects on seasonal shift were preliminarily discussed.The soil energy\|water distribution and freezing\|melting processes varied at different sites in northern part of Tibetan Plateau. The temporal and spatial variation of the soil moisture content is more complex than that of temperature. The soil moisture content increased with depth in certain layers but decreased in other layers. The freezing and melting processes and the temperature distribution were largely influenced by the existence of higher soil moisture content layer. During summer monsoon, the soil moisture at 10cm at all sites is relatively high, but the spatial difference existed. Generally speaking, the shallow layers start to freeze in October and to melt from April at all sites, with about 6 months frozen period. However, the beginning time of freezing\|melting and frozen period varied at different sites.

Interface Design Of Digital Platform For Bio Signal Processing

Bio-sensor arrays for multi-channel recording have been developed recently and signal processing platforms for those signals have been studied actively.But it’s thereal situation which these technologies are generally developed and studied respectively.So the interface design between recording array and signal processing platform is also an important issue to make bio-sensor signal processing system.In this paper,we proposed interface which has unique protocols to control sensor array and operate platform.There are two types of protocols in the interface.One is between sensor array and MCU in platform and the other is between MCU and board for wireless communication.Basically,each protocol has two kinds of modes(single,frame)and it can be extended if needed.

针织物图案变化与精准纺纱工艺的关系模型

为进一步确定基于一根结构可控的自固结子线经过织造可直接在织物上形成精准图案的尺寸变化与纺纱工艺之间的关系,以织物尺寸不变、图案等比例放大为研究要点,分析随着图案大小变化时各纱线段长度以及纺纱时间的变化规律,最终建立图案放大倍数与精准纺纱工艺的关系模型。以基础图案为基准,2个矩形图案间距不变,分别将矩形横向放大2倍和3倍。经过纺纱织造后分析可得:图案放大倍数(a)与循环纱长L呈(L)=1.65a+67.17的线性关系;各结构段长度及纺纱时间也呈现线性规律变化;所得精准纺纱工艺计算模型可快速确定各纱线段长度及运行时间,为织物图案尺寸变化后相对应的精准纺纱工艺参数预测提供了依据,减少试织次数和成本,提高制备效率。

Crude Oil Processing Unit Trial Run in Liaoyang

The 3.5 million t/a atmospheric and vacuum distillation unit in PetroChina Liaoyang Petrochemical Company (Liaoyang Petrochemical) came on stream and produced qualified products on July 1 lth,2008.The unit is planned to process 500 000 tons of crude oil from Venezu-ela in 2008.Liaoyang Petrochemical processed crude oil from Russia in the

Crude Processing Capacity up 6.7% for Sinopec

Sinopec Corp.(SH:600028)processed 182.6 million tons of crude oil in 2009,a year-on-yearincrease of 6.7%,the oil giant announcedon January 20th.The company sold 124 million tons of oilproducts in 2009,slightly up 0.85% from ayear earlier.Furthermore,Sinopec Corp.produced 301million barrels of crude oil in 2009,up 1.47%,and 34.43 million tons of gasoline,up 16.12%as well as 68.86 million tons of diesel。

Inference Use by Chinese College Learners in L2 Text Comprehension

Schema theory is an influential approach to text comprehension, which can account for inferring process in L2 text reading. According to the schema theory, comprehending a text is an interactive process between the reader's prior knowledge(top-down processing) and the text(bottom-up processing). Both top-down and bottom-up processing are necessary for the inferring in reading comprehension. This paper explores how good and poor Chinese learners adopts top-down processing and bottom-up processing to make inferences in L2 reading, and finds some differences and similarities in using textual materials and background knowledge to make inferences in L2 reading by good and poor Chinese EFL learners respectively.

龙眼肉的食疗价值及其开发利用前景

龙眼是我国南方的特色大宗水果,种植面积大,约有80万公顷。其假种皮-龙眼肉的营养价值高,是历史悠久的知名的滋补食品。随着龙眼果肉中的有效成分及保健机理被人们逐渐认识,龙眼肉的开发利用前景将更为广阔。

苦丁茶鲜叶加工技术研究

以冬青科冬青属苦丁茶种植物春叶的嫩叶和老叶为原料 ,采用锅炒杀青、锅炒加盐杀青、蒸青 3种加工工艺制成成品茶 ,分析了各处理对成茶品质的影响 .结果表明 :嫩叶处理浸提液与老叶处理浸提液的化学成分含量及种类不同 ,老叶蒸青浸提液中含有嫩叶蒸青浸提液中没有的成分 F,嫩叶处理浸提液各化学成分含量高于老叶处理 ;蒸青处理、锅炒加盐杀青处理对改善苦丁茶浸提液的苦味、亮度、色泽和提高水浸出物、各化学成分的浸出量有利 ;锅炒杀青处理 (尤其是老叶锅炒杀青处理 )能够促进物质的转化 ,形成新的物质 ;物质 C是苦丁茶的主要成分之一 。

基于小波分析的地震动转动分量研究

基于强震时断层附近地面地震动转动分量对单摆式地震仪水平和竖向摆造成的响应差异性,建立采用小波分析获取地震动转动分量的方法。首先采用离散小波变换探讨未修正地震动水平和竖向分量的局部时频特性;进而在水平和竖向分量低频差异性的基础上,建立新的阈值处理方法对水平分量的小波系数进行处理,从而获取了地震动转动分量;最后,通过振动台试验验证了基于小波分析的地震动转动分量获取方法的正确性和精度。结果表明:基于小波分析获取的地震动转动分量的残余倾斜位移与实测的基本吻合,且过滤掉转动分量的水平分量傅里叶谱的低频部分与竖向分量的较为相似;振动台试验验证了基于小波分析获取地震动摇摆分量方法的正确性,且相较于基于傅里叶分析的方法,结果与实际情况更加吻合,精度实现了大幅提高。

超宽带汽车防撞雷达的设计

将超宽带技术引入汽车防撞雷达领域。介绍了超宽带汽车防撞雷达对发射信号的要求,给出完整的系统框图和说明,介绍了通过PCI7300A数据采集卡对AD转换后的回波信号进行实时采集,并对采集到的数据进行时域处理的具体过程。重点提出了利用回波位置进行目标识别,以及利用3根接收天线来测角的新方法。针对汽车防撞的使用环境,只对存在相对运动的目标进行检测,从而降低了信号处理的难度,提高了图像的刷新率。

金属间化合物熔铸工艺的发展及应用

综述了金属间化合物的熔炼及铸造工艺的最新发展及应用情况,尤其强调了这些金属间化合物在熔铸过程中与传统工业合金的不同之处。

安徽亳州地区白术资源和产地加工方法调查

目的调查安徽省亳州地区白术资源和产地加工情况。方法实地调查。结果安徽省亳州地区白术生产发展迅猛,总种植面积达5万亩(3300 hm),已占白术市场的主要份额。结论重视人工栽培白术的研究,保证白术品质,对于促进安徽经济发展和开发安徽道地药材,具有重要意义。

正弦逆变电源的数字脉宽调制技术

文章分析比较了正弦逆变电源的数字滞环PWM技术、数字SPWM技术及空间矢量PWM技术的原理、特点及其相互之间的关系.通过构建实验平台,对数字SPWM技术和SVPWM技术进行了实验验证.实验结果表明:采用数字SPWM技术与SVPWM技术的正弦逆变电源具有逆变输出电压谐波分量低、波形畸变小的优点;在三相正弦逆变电源中后者的直流母线电压利用率比前者高.文章最后指出SVPWM技术将成为正弦逆变电源数字控制的主流技术.

超声逆散射图象重建问题中截断奇异值分解正则化方法研究

为解决超声逆散射成像问题中的非线性性,人们需要反复地求解前向散射方程和逆散射方程,以达到对全场和未知函数的精确近似,从而根据这一未知函数的精确近似,较好地重建物体内部的断层图象.前向散射方程是一个适定的方程组,可以采用通常的方法进行求解;而逆散射方程则是一个不适定性的方程组,即使数据中存在一个微小的误差,都可能引起解的较大偏离,因此,对这个不适定方程组的求解问题是整个迭代算法成功的关键.而在不适定性问题的求解过程中,正则化参数的选取又是非常重要的.求解不适定性方程的传统方法是Tikhonov正则化方法,这一方法的实质是在传统最小二乘方法上加上一个小于1的滤波因子,对于超声逆散射成像问题来说,效果并不太好.本文将截断奇异值分解正则化方法应用于逆散射方程的求解问题中,并对正则化参数的选取方法进行修正.数值仿真结果表明,这一方法配合适当的正则化参数选取,可以更好地滤除噪声,提高重建图象的质量与可信度,同时还可以减小迭代过程中的计算量.

虚拟社区知识管理流程文献计量分析

本文分别对国内外两大知识库中国知网CNKI和ISI Web of knowledge中截止到2011年的虚拟社区知识管理文献进行了计量,发现从知识管理流程出发进行研究的文献占了很大比重,进而从文献的来源与所属学科、增长情况、关注的热点内容、作者国别与院校分布等方面对这些文献进行了计量与分析,并提出了虚拟社区知识管理流程文献的发展趋势,希望为此领域研究提供方向和思路。

视觉引导AGV的数字图像处理方法研究

自动导航小车(AGV)的导航技术中,视觉导航具有信息量大和引导柔性等优点。视觉导航方式中,导航图像的处理技术处于很重要的地位。介绍了AGV导航技术的引导系统的原理,并针对视觉引导的AGV所采样的数字图像进行了噪声滤波、二值化、边缘检测和直线拟合等。通过在自主研制的小车样机上进行试验,验证了图像处理过程中的准确性和实时性,表明该方法对提高AGV可控制性具有良好的效果。