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基于工艺相似性的产品模块构建方法及其应用 被引量:11
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作者 刘伟 刘振宇 谭建荣 《计算机辅助设计与图形学学报》 EI CSCD 北大核心 2010年第10期1647-1654,共8页
为有效地提高企业的快速响应能力、加工设备利用率与生产效率,降低企业产品设计与制造成本,提出产品零部件工艺相似性分析与产品模块构建方法.首先对产品零部件工序制定规则进行分析,采用模糊设计结构矩阵建立工艺约束关系,并在此基础... 为有效地提高企业的快速响应能力、加工设备利用率与生产效率,降低企业产品设计与制造成本,提出产品零部件工艺相似性分析与产品模块构建方法.首先对产品零部件工序制定规则进行分析,采用模糊设计结构矩阵建立工艺约束关系,并在此基础上通过目标优化验证工艺序列的可行性;其次分析了产品零部件加工工艺序列模型,采用最大子相似序列集评价工艺序列的相似性,避免了因局部加工内容的不同导致的全局相似性误差;最后利用传递闭包法生成工艺序列相似零部件动态聚类过程.该方法已在机床制造行业中得到了实际应用,在满足客户需求的前提下有效地提高了产品设计与加工效率. 展开更多
关键词 工艺序列 相似序列 聚类 设计结构矩阵
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序列模式中知识发现问题描述与知识发现方法研究
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作者 殷国富 姜华 +1 位作者 龙红能 王卓 《Journal of Shanghai University(English Edition)》 CAS 2004年第A01期139-145,共7页
在分析基于工艺元的典型工艺信息组织模式的基础上,提出一种基于数据挖掘技术的从工艺数据中获取工艺元知识的方法.该方法采用文本聚类的思想扫描工艺数据库,将数据库中工艺描述划分为不同的类提取出常用工艺语句并设计了相应的处理... 在分析基于工艺元的典型工艺信息组织模式的基础上,提出一种基于数据挖掘技术的从工艺数据中获取工艺元知识的方法.该方法采用文本聚类的思想扫描工艺数据库,将数据库中工艺描述划分为不同的类提取出常用工艺语句并设计了相应的处理算法,通过改进Apriori方法设计的Apriori-seq算法用于对工艺规程序列进行挖掘获取工艺元.同时,开发出在制造工艺序列数据中进行知识发现的原型系统SCU-KDPS,应用表明本文的研究方法有较高的知识发现效率. 展开更多
关键词 序列模式 知识发现 问题描述 聚类分析 工艺序列 制造业
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低温生物菌剂在SBR工艺中的应用及功能分析 被引量:2
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作者 郭静波 马放 +2 位作者 杨基先 崔迪 魏利 《南京理工大学学报》 EI CAS CSCD 北大核心 2013年第1期175-181,共7页
为解决寒冷地区冬季城市污水厂低温启动周期长和运行不稳定的难题,考察了应用低温生物菌剂缩短序批式反应器(Sequencing batch reactor,SBR)冬季启动周期及提高其长期运行稳定性的可行性。构建后的低温生物菌剂和剩余污泥分别按SBR单池... 为解决寒冷地区冬季城市污水厂低温启动周期长和运行不稳定的难题,考察了应用低温生物菌剂缩短序批式反应器(Sequencing batch reactor,SBR)冬季启动周期及提高其长期运行稳定性的可行性。构建后的低温生物菌剂和剩余污泥分别按SBR单池有效容积的1%和4%投加到生化池内,并逐步由最初接种的生化池向其他生化池导泥;系统成功启动后,分别采集冬季低温期和春季气温回升期活性污泥样品进行了Biolog分析。结果表明:在平均水温为14℃时,仅用15 d完成了8组SBR生化池的启动;成功启动后的生化处理系统在常规条件下微生物群落结构较稳定,在水质水量及环境因子发生波动时,为适应环境及营养条件的变化,微生物群落结构及代谢类型也随之呈现动态演替的态势,从而保证了工艺运行的稳定性和理想的出水水质。低温菌剂在污水厂SBR工艺低温启动及稳定运行中发挥了重要作用。 展开更多
关键词 低温生物菌剂 序列式活性污泥工艺 启动 稳定运行 功能
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氯代硝基苯类生产废水厌氧-好氧序列生物处理研究 Ⅰ.反应器起动过程的特性 被引量:3
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作者 .项硕 叶敏 徐向阳 《浙江大学学报(农业与生命科学版)》 CAS CSCD 北大核心 2003年第2期195-200,共6页
结果表明,以对氯硝基苯、邻氯硝基苯等目标污染物或氯代硝基苯生产废水和模拟有机废水混合水样作为厌氧/好氧(A/O)序列生物处理反应器进水,通过逐步提高目标污染物浓度与负荷,可驯化富集得到转化、降解硝基苯类、苯胺类的厌氧与好氧污泥... 结果表明,以对氯硝基苯、邻氯硝基苯等目标污染物或氯代硝基苯生产废水和模拟有机废水混合水样作为厌氧/好氧(A/O)序列生物处理反应器进水,通过逐步提高目标污染物浓度与负荷,可驯化富集得到转化、降解硝基苯类、苯胺类的厌氧与好氧污泥;除硝基苯类在厌氧段得到转化外,苯胺类也可得到转化与降解。处理氯代硝基苯生产废水的厌氧/好氧系统在控制COD<600mg/L,HRT44h(A段20~24h,O段22h)的条件下,COD、硝基苯类(NAC)、苯胺类(AAC)的平均去除率分别为68%、97.4%及98.8%,出水主要污染物指标可达到GB8978-1996二级排放标准,对氯硝基苯、邻氯硝基苯等在系统中得到有效转化或降解。因此,厌氧/好氧序列生物工艺处理氯代硝基苯类生产废水是有效的。 展开更多
关键词 氯代硝基苯 生产废水 厌氧/好氧序列工艺 起动
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聚驱堵水技术适应性分析
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作者 于庆江 《内蒙古石油化工》 CAS 2022年第11期70-72,117,共4页
聚驱开发进入中后期以后,连通好、渗透性好的高产出层段含水率普遍较高,容易出现单层突破进入无效循环。为提高开发效果,扩大注聚波及体积,动用富集剩余油,对具备条件的井实施堵水,根据不同的井况及实施目的,应用了不同类型的堵水工艺,... 聚驱开发进入中后期以后,连通好、渗透性好的高产出层段含水率普遍较高,容易出现单层突破进入无效循环。为提高开发效果,扩大注聚波及体积,动用富集剩余油,对具备条件的井实施堵水,根据不同的井况及实施目的,应用了不同类型的堵水工艺,通过对工艺适应性评价,形成了适合我厂聚驱开发的堵水工艺序列。 展开更多
关键词 聚驱 无效循环 堵水 工艺序列
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Synthesis of Isonucleoside-Incorporated Oligonucleotides and Their Binding Abilities with Complementary Sequences
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作者 史继峰 王占黎 +1 位作者 张亮仁 张礼和 《Journal of Chinese Pharmaceutical Sciences》 CAS 2004年第1期4-9,共6页
Aim To synthesize isonucleoside-incorporated oligonucleotides and investigatetheir binding abilities with complementary sequences. Methods The synthesis was performed on DNAsynthesizer, and the binding behavior was in... Aim To synthesize isonucleoside-incorporated oligonucleotides and investigatetheir binding abilities with complementary sequences. Methods The synthesis was performed on DNAsynthesizer, and the binding behavior was investigated by thermal denaturation studies. Results Fourkinds of single isonucleoside containing oligonucleotides were synthesized. The results of thermaldenaturation showed that the existence of isonucleoside decreased the stability of duplex, and theeffect was more obvious when the isonucleoside was in the middle of the sequence. No obviousdifference was observed when 6'-OH of isonucleoside was free or was protected by allyl group.Conclusions The existence of isonucleoside in oli-gonucleotide makes chain twist and decreased thestability of duplex. 展开更多
关键词 isonucleoside NUCLEOTIDES HYBRIDIZATION thermal denaturation
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A 155Mbps 0.5μm CMOS Limiting Amplifier
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作者 焦阳 王志功 +1 位作者 王蓉 管志强 《Journal of Semiconductors》 EI CAS CSCD 北大核心 2007年第2期176-181,共6页
This paper presents a 155Mbps limiting amplifier for STM-1 systems of SDH optical communication. It is implemented in CSMC 0.5μm CMOS technology. Under a supply voltage of 3.3V, it has a power consumption of 198mW. T... This paper presents a 155Mbps limiting amplifier for STM-1 systems of SDH optical communication. It is implemented in CSMC 0.5μm CMOS technology. Under a supply voltage of 3.3V, it has a power consumption of 198mW. The core of the circuit is composed of 6 cascaded amplifiers that are in a conventional structure of differential pairs,an output buffer, and a DC offset cancellation feedback loop. The small signal gain can be adjusted from 74 to 44dB by an off-chip resistor. The chip was packaged before being tested. The experimental results indicate that the circuit has an input dynamic range of 54dB and provides a single-ended output swing of 950mV. Its output eye diagram remains satisfactory when the pseudo-random bit sequence (PRBS) input speed reaches 400Mbps. 展开更多
关键词 optical communication limiting amplifier CMOS technology SDH
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Isolation, cloning and sequencing of AFLP markers related to disease-resistance traits in Fenneropenaeus chinensis 被引量:4
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作者 岳志芹 王伟继 +1 位作者 孔杰 戴继勋 《Chinese Journal of Oceanology and Limnology》 SCIE CAS CSCD 2005年第4期442-447,共6页
Amplified fragment length polymorphisms (AFLP) technique was used to analyze the fingerprint- ing of four successive generations of Fenneropenaeus chinensis to reveal their disease-resistance traits. Some loci showed ... Amplified fragment length polymorphisms (AFLP) technique was used to analyze the fingerprint- ing of four successive generations of Fenneropenaeus chinensis to reveal their disease-resistance traits. Some loci showed quite different genetic frequencies due to artificial selection, which implied that these fragments were putative markers related to the disease-resistance trait. We developed a simple and effective method to fur- ther characterize these AFLP fragments. Specific AFLP bands were cut directly from polyacrylamide gels, re-amplified, cloned and sequenced. Eight putative genetic markers were sequenced and their sizes ranged from 63 to 209 bp. The sequences were submitted to dbGSS (database of Genome Sequence Survey); and the BLAST analysis showed low similarity to the function genes, indicating these markers were tightly linked to a dis- ease-resistance trait but were not functional genes. 展开更多
关键词 AFLP Fenneropenaeus chinensis disease-resistance trait markers CLONE sequence
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Equation oriented method for Rectisol wash modeling and analysis 被引量:3
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作者 高宁 翟持 +1 位作者 孙巍 张新宇 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2015年第9期1530-1535,共6页
Rectisol process is more efficient in comparison with other physical or chemical absorption methods for gas purification. To implement a real time simulation of Rectisol process, thermodynamic model and simulation str... Rectisol process is more efficient in comparison with other physical or chemical absorption methods for gas purification. To implement a real time simulation of Rectisol process, thermodynamic model and simulation strategy are needed. In this paper, a method of modified statistical associated fluid theory with perturbation theory is used to predict thermodynamic behavior of process. As Rectisol process is a highly heat-integrated process with many loops, a method of equation oriented strategy, sequential quadratic programming, is used as the solver and the process converges perfectly. Then analyses are conducted with this simulator. 展开更多
关键词 Rectisol process simulation Modified statistical associated fluid theory Equation oriented Sequential quadratic programming
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