共查询到19条相似文献,搜索用时 46 毫秒
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文章简述了某电厂动力基础设备由于产生不均匀沉降而采取双液硅化法和密压双液注浆法进行加固处理,取得了良好的加固效果,指出该方法可为类似工程提供借鉴。 相似文献
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CO2混相驱是提高低渗透油藏采收率最有前景的方法之一,CO2最小混相压力是注CO2开发的一个重要参数,只有当驱替压力高于最小混相压力时才可能达到混相驱。所研究油田属于特低渗透油田,本文采用两种方法针对原油进行了注CO2最小混相压力实验。当采用界面张力法时,发现随着压力的增加,地层原油与CO2间界面张力逐渐下降,并在约33-34MPa时达到混相状态;当采用细管实验方法时,确定的最小混相压力值为32.2MPa。由此获得的注CO2驱油的最小混相压力值可为油藏开采和油气生产提供重要参考。 相似文献
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苑海青 《中国高新技术企业评价》2011,(27):85-86
伴随着现代中国经济的迅速发展,我国建材和陶瓷行业也相应的取得了非常大的发展空间和发展机遇,为国民经济的持续进步发挥着重要的作用。其中,硼酸作为高硼硅酸盐玻璃、电子、精细硼化物、含硼新材料等行业的重要材料具有相当好的发展前景,并且随着社会的发展,行业对于其需求量也会逐年增加。但是目前我国对于提硼的的相关法和技术上存在着一些问题,文章对盐湖卤水酸法提硼工艺进行了研究。 相似文献
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国家标准GB/T5530-2005测定诸如磷虾油油脂酸值时存在难以判断终点的问题。在磷虾油油脂中添加适量中性饱和食盐水,利用饱和食盐水的破乳作用及其对微过量碱的竞争优势,然后按照国标法(冷溶剂法)进行滴定操作,可以清晰地观察到滴定终点,从而使滴定结果准确无误且精密度高。 相似文献
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2003年1~3月欧洲分析协会(AEAO)组织了Pt950铂样品的比对实验,共有英国、法国、德国、意大利、荷兰等23个国家和地区的26个实验室参加,国家首饰质量监督检验中心作为其中之一是以观察员身份参加。此次比对指定了ISO11210:1995氯铂酸铵重量法、ISO11489:1995氯化汞还原法、ISO/ 相似文献
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在烘炒食品检验时,对用样品去壳处理与非去壳处理两种制备的方法进行过氧化值的试验,通过样品不同浸泡时间酸价的测定试验,得出了样品处理可考滤直接制样而不去壳,提取油脂的时间应是浸泡8~18h的结论。 相似文献
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准确预测凋亡蛋白的亚细胞位点有利于理解细胞死亡的机理和其生物学功能。本文利用裂解位点的蛋白质序列信息提出了一种新的凋亡蛋白的预测算法PSSP.对三个凋亡蛋白数据集进行Jackknife验证表明我们的方法得到了令人满意的结果。 相似文献
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Radial and nonradial measures of technical efficiency: An empirical illustration for Belgian local governments using an FDH reference technology 总被引:1,自引:0,他引:1
This paper serves two purposes. First, we argue that radial efficiency measures are inappropriate for the Free Disposal Hull (FDH) technology, and we provide a comparative analysis of alternative nonradial measures. In particular, using information on Belgian local government expenditures and output indicators we implement various radial and nonradial measures on the FDH reference technology, and we investigate to which extent these efficiency measures imply different distributions and rankings. Second, we analyze the patterns of measured technical efficiency implied by the various indices. Specifically, we investigate whether different measures make any substantial difference for the explanation of the calculated inefficiencies. The empirical results suggest that more important differences in rankings exist between radial and nonradial measures than between different nonradial alternatives; moreover, the radial and the nonradial efficiency measures do yield a somewhat different pattern of explanation.This is a revision of a paper presented at the 38th Conference of the Applied Econometrics Association in Athens (April 12–13, 1993). Comments of R. Goudriaan, Henry Tulkens, and two anonymous referees are gratefully acknowledged. 相似文献
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This paper develops a probabilistic clustering model for mixeddata. The model allows analysis of variables of mixed type: thevariables may be nominal, ordinal and/or quantitative. The modelcontains the well-known models of latent class analysis as submodels.As in latent class analysis, local independence of the variables isassumed. The parameters of the model are estimated by the EMalgorithm. Test statistics and goodness-of-fit measures are proposedfor model selection. Two artificial data sets show the usefulness ofthese tests. An empirical example completes the presentation. 相似文献
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In this paper a sufficient condition for the identifiability of finite mixtures is given. This condition is less restrictive than Teicher’s condition Teicher H, Ann Math Stat 34:1265–1269 (1963) and therefore it can be applied to a wider range of families of mixtures. In particular, it applies to the classes of all finite mixtures of Log-gamma and of reversed Log-gamma distributions. These families have been already studied by Henna J Jpn Stat Soc 24:193–200 (1994) using another condition, different from Teicher’s, but more difficult to check in many cases. Furthermore, the result given in this paper is very appropiated for the case of mixtures of the union of different distribution families. To illustrate this an application to the class of all finite mixtures generated by the union of Lognormal, Gamma and Weibull distributions is given, where Teicher’s and Henna’s conditions are not applicable 相似文献
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We propose an easily implementable test of the validity of a set of theoretical restrictions on the relationship between economic variables, which do not necessarily identify the data generating process. The restrictions can be derived from any model of interactions, allowing censoring and multiple equilibria. When the restrictions are parameterized, the test can be inverted to yield confidence regions for partially identified parameters, thereby complementing other proposals, primarily Chernozhukov et al. [Chernozhukov, V., Hong, H., Tamer, E., 2007. Estimation and confidence regions for parameter sets in econometric models. Econometrica 75, 1243–1285]. 相似文献
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文章介绍了一种用于新型脉冲电子围栏的低压告警模块的设计,给出了设计思路和方法,并画出了相关硬件电路的设计框图。 相似文献
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采用因子分析法,比较了广西与中部六省物流产业竞争力。结果表明,广西物流产业与中部六省还有一定差距,主要是由于高速公路路网密度较低和市场开放程度过低等原因。并提出从改善物流基础设施入手,提高物流产业投入,以此提升广西物流产业竞争力。 相似文献