宝钢三高炉计算机通信方式再造

原三高炉过程机与外部计算机通信采用MODEM方式和BSC协议，是一个封闭式的通信结构。通过软硬件改造，利用铁区局域网，安装相关通信软件，最终改造成为局域网通信方式，采用TCP／IP协议的开放性通信结构，并成功应用于与分析过程机、铁水管理机和铁区管理机的通信中。     

问与答

1.什么是数据通信规程? 答:数据通信就是利用传输线路传递信息代码,通信的双方是计算机和计算机,或者是计算机和终端。为了保证数据通信和双方能有效地、可靠地、自动地进行通信,在通信的发送和接收端之间就需要制定一系列的规则或约定。这些通信的规则或约定,就叫做数据通信规程(或协议),也叫作数据传输控制规程。 数据传输控制规程已经经历了两代。第一代是面向字符的基本型传输控制规程,它是60年代这初期为适应成批处理数据传输的需要而出现的。美国IBM公司的二进制同步通信控制规程(BSC),美     

1 580 mm热轧BSC协议应用及改造方案研究

介绍BSC通信协议相关内容和1 580m热轧三电系统的系统配置概况.鉴于BSC协议的不足,1580热轧线的电气改造,必须实现BSC协议至TCP/IP协议的转换,开发出相应的网关Gateway-PCI,介绍新网关的工作原理和应用,同时介绍了一种经济、低风险、分步进行的过程计算机和仪表改造方案,为其它类似系统改造提供一条新思路.     

基于BSC设计院项目群管理绩效评价研究

利用平衡计分卡(BSC)理论,从财务、客户、内部管控、学习与成长4个维度,构建了基于BSC的设计院项目群绩效评价指标体系。同时,根据BSC系统的特点,利用综合评价法,建立了设计院项目群绩效评价模型,并以某单位在同一时间段完成的5个项目为例进行了验证。     

加热炉的双重目的——提高加热质量和节约能源

英国钢铁公司(BSC)Swinden实验室燃料和炉子部经理D F Hibberd著文宣称:燃料廉价时代的过去,提高加热质量和减少能源消耗双重要求的日趋强烈,已经支配着炉子的设计和控制。BSC在矿物燃料燃烧装置的开发和应用方面的研究,一直走在世界的前列,D F Hibberd在本文中介绍了如下的技术进步。     

论公共部门绩效评价指标体系构建——以ZS市国税局为例

本文在BSC法与KPI法原理基础上加以补充、调整.以ZS市国税局为例对其战略绩效评价指标体系进行了实证分析.以期为我国众多公共部门当前必须面对的战略及战略绩效评价问题提供一点思路.     

控制中间包钢流旋转阀的开发和操作经验

一、前言本文叙述的是中间包钢流旋转阀的开发过程和工厂的操作经验。该设备已使用了3年之久,到1988年4月为止,已经浇注钢水1100000多吨。Rocon旋转阀是Teesside厂发明,由BSC钢铁公司和Clydebank的钍陶瓷制品有限公司共同开发的,它可以很好地     

现代组织绩效考核方法的比较分析

绩效管理是现代企业人力资源管理的基础,对绩效的考核则是监控完成组织目标的核心要素,而组织绩效考核方法的选择是绩效考核的重要环节.本文将对360度、BSC、KPI和MBO绩效考核方法的特点和内涵进行比较和分析,以便使组织根据自身的模式选择正确的组织绩效考核方法.     

英钢联(BSC)斯肯索普厂高炉的粒煤喷吹

一、前言 1980～1981年,在英钢联(BSC)斯肯索普厂进行的技术经济分析表明,由于粒煤喷吹的成本低于其他任何粉状燃料喷吹的成本,所以粒煤喷吹是一种经济的和很有吸引力的方案。粒煤还有一些其他的优点,譬如,与粉状燃料喷吹相比,可适当放宽设备的安     

计算机网络与PLC的通信

主要介绍计算机的通信方式和S7的通信功能。     

Chimeric brains generated by intraventricular transplantation of fetal human brain cells into embryonic rats

OBJECTIVE: To determine whether bacterial stool cultures (BSC) are useful in initial evaluation of children with symptoms of nosocomial diarrhea. To answer this question we performed a retrospective record review to determine the yield of BSC in children who developed diarrhea after the third hospital day (HD-3). METHODS: The hospital computer record keeping system was utilized to compile the result of BSC collected from children and adolescents ages 0 to 20 years between January 1, 1988, and October 31, 1996. All specimens were analyzed for Salmonella, Shigella, Yersinia and Campylobacter. We reviewed hospital charts of all children who developed a positive BSC beyond HD-3 to determine the time of onset of diarrhea and clinical circumstances. RESULTS: A total of 11 516 BSCs were submitted from 9262 children during the 8 1/2-year period. Five hundred sixty-eight (6.6%) of 9262 children had at least 1 positive BSC. Two thousand five hundred seventy-two children had the first BSC submitted after HD-3 and 13 (0.5%) of these children had a positive result. Chart review of these 13 children demonstrated that 6 had onset of diarrhea during the first 3 hospital days. Therefore only 7 children met our criteria for having nosocomially acquired diarrhea caused by a bacterial pathogen. Children whose first BSC was submitted after HD-3 accounted for 3767 (46%) of the total 8126 inpatient BSCs and in excess of $21000 annually in patient billing charges. CONCLUSION: In the absence of a known exposure the isolation of a bacterial pathogen from the stool of children with onset of diarrhea beyond HD-3 is a rare event. Under most circumstances BSC should not be part of the initial evaluation of children with symptoms of nosocomial diarrhea.     

基于模糊AHP的零售业平衡记分卡业绩评价

应用平衡记分卡对零售业业绩的全面综合评价，是零售业坚持科学发展观的具体体现。设置合适的评价指标体系是应用平衡记分卡成功的关键步骤；然后根据模糊AHP（层次分析法）确定各指标权重；最后根据各指标的得分，就可以零售业业绩评价的综合加权得分。     

Update on national toxicology program (NTP) assays with genetically altered or "transgenic" mice

The NTP is evaluating several lines of genetically altered mice for possible use in identifying and assessing carcinogens. The NIEHS/NTP programs and progress in this area were recently reviewed by the NTP Board of Scientific Counselors (BSC). A number of comments and concerns were raised. This commentary summarizes and responds to the BSC review and offers some thoughts on future directions for this line of research as well as possible ways genetically altered mice might be integrated into a comprehensive testing strategy.     

Isolated proteinuria in asymptomatic patients

Regional cerebral blood flow (rCBF) was measured by 133Xe inhalation in 17 patients with chronic spinal cord transection. This was done to investigate any effects such spinal cord deafferentation might have on resting rCBF and to test whether resulting chronic preganglionic sympathectomy influenced cerebral vasomotor CO2 responsiveness and autoregulation. Thirteen patients had complete cervical cord transection (CCT) at levels C4--C6 (age 37 +/- 15 years, time interval, 2 months--20 years). Four patients had complete thoracic cord transection at levels T3--4, T8 and T12 (TCT; age 49 +/- 22 years; time interval 2--5 months). CO2 responsiveness was tested by induced hypercapnia in 11 patients with CCT and 2 patients with TCT. Autoregulation was tested in 10 patients with CCT and 4 patients with TCT by decreasing cerebral perfusion pressure during postural tilting. Mean resting hemispheric Fg values (MHFg) were significantly reduced only in patients with CCT (MHFg = 69 +/- 12 ml/100 g brain/min), while brain stem-cerebellar Fg values (BSC Fg) were reduced significantly both in patients with CCT (BSC Fg = 85 +/- 10) and with TCT (BSC Fg = 88 +/- 12) compared to values measured in healthy normals (N = 21, MHFg = 81 +/- 10, BSC Fg = 98 +/- 10). Hemispheric CO2 responsiveness showed a trend toward reduction in patients with CCT but this was not statistically significant. Hemispheric autoregulation was significantly impaired in CCT compared to healthy normals but improved with time and rehabilitation.     

The influence of volition on breathing-swallowing coordination in healthy adults.

This research was designed to clarify the role of cortical modulation in the coordination of respiration and swallowing. Time-locked recordings of submental surface electromyography, nasal airflow, and thyroid acoustics were used to evaluate nonnutritive breathing-swallowing coordination (BSC) and swallowing apnea duration (SAD) of 20 healthy adults during 3 conditions. These conditions represented a continuum of volitional through nonvolitional swallowing control on the basis of a decreasing level of cortical activation: voluntarily initiated swallows during wakefulness, nonvolitional awake swallows, and reflexively initiated swallows during sleep. Differing proportions of swallows at the cusps between inspiration and expiration were found between the volitional and nonvolitional conditions, irrespective of the level of arousal. SAD was unaltered by condition. In conclusion, BSC is influenced by degree of volition but not by level of arousal. This implies that cortical influence on BSC is limited to conditions in which swallowing is voluntarily initiated and indirectly implicates the recruitment of the supplementary motor or insular cortices. SAD remained stable across conditions and may therefore be considered relatively impervious to suprabulbar influence. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Inhibition of DNA cytosine methyltransferase by chemopreventive selenium compounds, determined by an improved assay for DNA cytosine methyltransferase and DNA cytosine methylation

The organoselenium compounds benzyl selenocyanate (BSC) and 1,4-phenylenebis(methylene)selenocyanate (p-XSC), as well as sodium selenite, are effective chemopreventive agents for various chemically induced tumors in animal models at both the initiation and postinitiation stages. The mechanisms involved at the postinitiation stage are not clear. Because several lines of evidence indicate that inhibition of excess DNA (cytosine-5)-methyltransferase (Mtase) may be a sufficient factor for the suppression or reversion of carcinogenesis, we examined the effects of sodium selenite, BSC, p-XSC and benzyl thiocyanate (BTC), the sulfur analog of BSC, on Mtase activity in nuclear extracts of human colon carcinomas, and of p-XSC on the Mtase activity of HCT116 human colon carcinoma cells in culture. For this purpose, we developed an improved Mtase assay, in which the incorporation of the methyl-[3H] group from S-adenosyl[methyl-3H]methionine into deoxycytidine of poly(dI-dC)-poly(dI-dC), is specifically determined by HPLC with radioflow detection after enzymatic hydrolysis, enhancing specificity and reliability. In a variation, using SssI methyltransferase and labeled S-adenosylmethionine, the overall methylation status of DNA in various tissues can also be compared. Selenite, BSC and p-XSC inhibited Mtase extracted from a human colon carcinoma with IC50s of 3.8, 8.1 and 5.2 microM, respectively; BTC had no effect. p-XSC also inhibited the Mtase activity and growth of human colon carcinoma HCT116 cells, with an IC50 of approximately 20 microM. The improved Mtase assay should prove to be a reliable method for screening potential Mtase inhibitors, especially using cells in culture. We suggest that inhibition of Mtase may be a major mechanism of chemoprevention by selenium compounds at the postinitiation stage of carcinogenesis.     

Oral health status of an industrial population in Romania

BACKGROUND: We investigated whether addition of bismuth subcitrate (BSC, 4 x 120 mg) to a two week therapy scheme of omeprazole (OME, 2 x 40 mg)/amoxicillin (AMO, 4 x 500 mg) increases Helicobacter pylori eradication. MATERIALS AND METHODS: Patients with dyspepsia underwent upper endoscopy. H. pylori positive patients were randomized to treatment A (OME/AMO, 83 patients) or treatment B (OME/AMO/BSC, 84 patients). RESULTS: In 65 patients of group A (78%) H. pylori was eradicated as determined from the histological assessment (Sydney classification) of antrum and corpus biopsies. In comparison, in 68 patients of group B (81%) H. pylori was eradicated (p = NS between groups). H. pylori eradication in both groups was associated similarly with a decrease of inflammation and activity whereas atrophy and intestinal metaplasia were not affected. A positive association was revealed between the decrease of H. pylori score and the decrease of both inflammation and activity scores for antrum as well as corpus biopsies. CONCLUSIONS: Addition of BSC to OME/AMO does not increase H. pylori eradication in patients with dyspepsia. Eradication of H. pylori is associated with disappearance of epithelial damage (inflammation and activity) in antral and corpus mucosa.     

Identification of promoter elements involved in the cytosolic Ca(2+)-mediated photoregulation of maize cab-m1 expression

Changes in cytoplasmic Ca2+ levels are involved in the regulation of several plant genes. However, to our knowledge, no regions of genes or specific cis elements have been shown to be involved in the regulation of plant gene expression by cytosolic Ca2+ signaling. The maize (Zea mays) gene cab-m1, which encodes a light-harvesting chlorophyll a/b-binding apoprotein, is positively photoregulated in mesophyll cells (MC) but not in bundle-sheath cells (BSC). This gene is highly preferentially expressed in maize MC versus BSC. In situ transient expression assays have revealed that exposure of tissues to ethyleneglycol-bis(beta-aminoethyl ether)-N,N'-tetraacetic acid (EGTA), which chelates Ca2+, blocks the photostimulation of cab-m1 full promoter (-1026 to + 14) activity in MC of leaf segments of dark-grown maize seedlings. EGTA has no effect on expression in BSC. These results suggest that light-induced elevation of the cytosolic Ca2+ concentration in MC is required for the enhancement of cab-m1 expression in MC. Deletion of the sequence from -1026 to -360 completely abolished Ca2+ responsiveness of cab-m1 expression in MC. On the other hand, a 54-bp fragment in the 5' flanking region (-953 to -899 relative to the translation start site) conferred Ca2+ responsiveness on a -359 core promoter: reporter gene, suggesting that Ca2+ signaling is mediated via specific sequences in this short fragment. Furthermore, possible involvement of Ca(2+)-calmodulin in the signal transduction chain for regulating cab-m1 expression was suggested by the results of inhibitor experiments.     

Inhibition of human cytochrome P450-catalyzed oxidations of xenobiotics and procarcinogens by synthetic organoselenium compounds

The effects of synthetic chemopreventive organoselenium compounds 1,2-, 1,3-, and 1,4-phenylenebis(methylene)selenocyanate (o-, m-, and p-XSC, respectively), benzyl selenocyanate (BSC), and dibenzyl diselenide (DDS) and inorganic sodium selenite on the oxidation of xenobiotics and procarcinogens by human cytochrome P450 (P450 or CYP) enzymes were determined in vitro. Spectral studies showed that BSC and three XSC compounds (but not sodium selenite or DDS) induced type II difference spectrum when added to the suspension of liver microsomes isolated from beta-naphthoflavone-treated rats, with m-XSC being the most potent in inducing spectral interactions with P450 enzymes; m-XSC also produced a type II spectral change with human liver microsomes. o-, m-, and p-XSC inhibited 7-ethoxyresorufin O-deethylation catalyzed by human liver microsomes when added at concentrations below 1 microM levels, but BSC and DDS were less effective. All of these compounds inhibited the oxidation of model substrates for human P450s to varying extents. We studied the effects of these compounds on the activation of procarcinogens by recombinant human CYP1A1, 1A2, and 1B1 enzymes using Salmonella typhimurium NM2009 tester strain for the detection of DNA damage. The three XSCs were found to be very potent inhibitors of metabolic activation of 3-amino-1,4-dimethyl-5H-pyrido[4,3-b]indole, 2-amino-3,5-dimethylimidazo[4,5-f]quinoline, and 2-aminoanthracene, catalyzed by CYP1A1, 1A2, and 1B1, respectively. The potency of inhibition of m-XSC on CYP1B1-dependent activation of 2-aminoanthracene was compatible to those of alpha-naphthoflavone. These inhibitory actions may, in part, account for the mechanisms responsible for cancer prevention by organoselenium compounds in laboratory animals.