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为提高乳香挥发油在制剂中的稳定性,对舒筋通络颗粒中乳香挥发油的提取及其包合工艺进行了研究。选择浸泡时间(A)、药材粒径(B)、加水量(C)、提取时间(D)为考察因素,采用L_9(3~4)进行正交试验设计,优化乳香挥发油的提取工艺,通过正交试验,对饱和水溶液法和胶体磨法两种包合方式进行了工艺研究。结果表明:影响因素的优化组合为A_1B_1C_1D_3,其中加水量和提取时间对收率具有极显著性影响,包合时间、挥发油和β-环糊精比例、包合温度对饱和水溶液法有极显著性影响;研磨时间、挥发油和β-环糊精比例对胶体磨法有极显著性影响。从生产角度考虑,包合乳香挥发油采用胶体磨法较饱和水溶液法更具有优势。 相似文献
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《中国电力企业管理》2007,(14)
(总分100分)一、单项选择题(每题1分,共15分)1.穿管明敷设的线路,钢管壁厚不小于()毫米。A0.8B1.0C2.0D3.02.低压电力线路与弱电线路交叉时,电力线路与一级弱电线路的交叉角不小于()度。A35B40C45D503.铁壳负荷开关应按负荷额定电流的()倍选择。A1~2B2~3C2~4D3~44.巡线人员发现导线断落地面或悬吊空中时,应设法防止行人靠近断线地点()米以内。A3B5C6D85.安装电容器的环境,一般相对湿度应不大于()%。A65B75C85D956.供电区域内设备管理要分工明确,责任到人,对设备缺陷必须做好记录,并按()分类处理。A缺陷等级B设备等级C电压等级… 相似文献
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采用溶剂法提取香薷中黄酮化合物,并进行单因素工艺考察,筛选出最佳的提取条件.在单因素基础上,利用响应面分析法考察乙醇浓度、提取温度及物料比对提取香薷总黄酮的影响,并在各影响因素合理值内修正最佳工艺条件.结果表明,香薷总黄酮最佳提取工艺条件为提取时间1h,乙醇体积分数70%,提取温度70℃. 相似文献
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《中国电力企业管理》2007,(24)
(总分100分)一、单项选择题(每题1分,共20分)1.电流的基本国际单位是()。A焦耳B瓦特C安培D伏特2.电压保护装置的电气文字符号是()。A PV B APAC APD D APR3.测量仪表的误差可分为()。A测量误差和基本误差B基本误差和相对误差C基本误差和附加误差D绝对误差和相对误差4.我国采用的工业频率(简称工频)为()HZ。A50B60C80D1005.下列高压电器属于补偿电器的是()。A互感器B电容器C断路器D交流接触器6.在低压供电线路中,若计算回路中的负荷电流为()及以下时,应采用直接接入式的三相四线有功电能表进行计量。A40A B50AC80A D100A7.… 相似文献
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《中国电力企业管理》2007,(18)
一、单项选择题(每题1分,共10分)1.电功率的大小与()无关。A时间B电压C电流D电阻2.线路检修挂接地线时,应先接()。A接地端B A相C B相D C相3.已知一钢芯铝绞线钢芯有7股,每股直径2.0毫米,铝芯有28股,每股直径2.3毫米,其导线型号为()。A LGJ-240/50B LGJ-185/25C LGJ-150/25D LGJ 相似文献
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《中国电力企业管理》2007,(8)
一、单选题(每题1分,共10分)1.若触电者心跳停止,呼吸尚存,应立即对触电者施行()急救。A仰卧压胸法B仰卧压背法C胸外心脏挤压法D口对口呼吸法2.当停电检修线路与另一回10千伏及以下带电线路交叉邻近的距离小于()米时,另一回带电线路也应停电并挂接地线。A1B1.5C2D2.53.防止雷电 相似文献
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《中国电力企业管理》2007,(6)
一、单项选择题(每题1.5分,共45分)1.已执行的工作票由供电所保存,保存期()个月。A2B3C6D122.在人身触电伤害赔偿范围中,在计算当事人的亲友参加处理事故所需费用时,计算人数不超过()人。A2B3C4D53.自电杆引下的接户线和室外进户线最小线间距离一般不小于()毫米。A100B150C200D3004.用电功率因数的高低,直接关系到供电的电压质量。因此,提高功率因数,做到无功电力就近供应,就地平衡,是一项极重要的()措施。A补偿B节能C计划5.挂接地线时,若杆塔无接地引线时,可采用临时接地棒,接地棒插入地面深度应不小于()米。A0.5B0.6C1.06.供电企… 相似文献
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Employees in four firms in Taiwan—a small family business (A), a state-owned enterprise (B), a large private corporation (C), and a U.S.-owned venture (D)—and one firm in the U.S. (E) responded to supervisory directions. A's employees were the most compliant, followed by B's, then by C's, D's, and E's. In A and B, employee compliance was impacted by company policy. In C, D and E, employee compliance was influenced by peer consensus. Except for those in A, employees' tendency to accept supervisory direction was enhanced when they assessed the direction as beneficial to their organization. 相似文献
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以城市排污河道为研究对象,测定了表层沉积物中的重金属总量、水质常规指标及DBP和DEHP,采用改进的主成分分析法和等标有机污染指数分析对排污河污染状况进行分析评价。运用改进的主成分分析法找出了主要污染源和主要污染物。结果表明:不同排污口的主要污染物不同,B化工厂CODCr及pH值为主要污染物;C泵站污染严重的为CODCr,pH值和TP;D排污口主要污染物为CODCr,NH3-N,Cr和pH值;E化工厂的主要污染物为CODCr,NH3-N和Cd。D排污口是第一主成分的主要污染源点,B化工厂无论是DBP等标污染指数还是DEHP等标污染指数均明显高于其他排污口,是A排污河PAEs污染的主要污染源。 相似文献
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How Do Interaction Activities among Customers and between Customers and Firms Influence Market Performance and Continuous Product Innovation? An Empirical Investigation of the Mobile Application Market 下载免费PDF全文
Mobile application markets (MAMs) significantly differ from other existing marketplaces at least in two aspects. First, customers (app users) and firms (app providers) frequently interact with each other in real time, which is not common in the conventional marketplaces. Second, many app providers incorporate customers’ opinions or suggestions into their software upgrades, representing one of the most unique and interesting aspects of MAMs. Therefore, it has become critical to understand the impact of interaction activities not only among customers, but also between customers and firms on the market performances of new products in MAMs. One of the most significant issues firms face is whether firms reflect on customers’ postpurchase interaction activities, and the next interesting question is how firms respond to them. This study explores the effects of customer‐to‐customer (C2C), customer‐to‐firm, and firm‐to‐customer interaction activities on market performance. In addition, this study investigates how communication activities influence a firm's tendency to pursue continuous product innovation through research and development (R&D). Using data obtained from a major MAM, T store, three models that are respectively related to product sales, product lifetime, and a firm's R&D activity for product upgrades, are applied to empirically test hypotheses concerning the effects of interaction activities. In our analyses of market performance, a hierarchical log regression model with 10,840 weekly transactions data set related to product sales (model A) and 291 aggregate transactions related to product lifetime (model B) is used. Results indicate that C2C and customer‐to‐firm communication activities have a positive impact on sales, but little relationship with product lifetime. However, a firm's continuous product R&D has a positive impact on both sales and lifetime performance. Our analysis of a firm's R&D (model C) shows that C2C and customer–firm communication increases a firm's R&D activity. Taken together, these results have important implications for customer–firm interactions, market performance, and R&D strategies. 相似文献
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E-Procurement adoption in the Southcoast SMEs 总被引:1,自引:1,他引:0
Angappa Gunasekaran Ronald E. McGaughey Eric W.T. Ngai Bharatendra K. Rai 《International Journal of Production Economics》2009,122(1):161
E-Commerce is expected to play a major role in the 21st century global market. Of the various E-commerce models (B2B, B2C, B2E and B2G), B2B has been particularly successful, due to adoption of standardized processes for document exchange (like EDI), shipping, tracking, delivery and payment among supply chain partners. One element of B2B is E-procurement. E-procurement focuses on acquisition of resources, especially MRO items, and increasingly materials and components. Some analysts believe that enormous cost savings and increased effectiveness can be achieved through the utilization of E-procurement. E-procurement utilizes electronic purchase procedures implemented through Internet communication and Web based buying tools. Studies in the literature report on the adoption of E-procurement in different countries and industries. This study focuses on the current status of E-procurement in small and medium sized enterprises (SMEs) located in the Southcoast of Massachusetts. The main objective of this research is to understand the current state of E-procurement in SMEs and to examine those things that influence E-procurement adoption. A questionnaire-based survey was employed for data collection. A conceptual model was developed to describe/explain the adoption of E-procurement and a framework is proposed for the successful adoption of E-procurement on the Southcoast of Massachusetts. 相似文献
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《英国劳资关系杂志》1973,11(3):472-484
Book reviewed in this article:
Consciousness and Action among the Western Working Class, by Michael Mann
Grundrisse: Foundations of the Critique of Political Economy (Rough Draft), by Karl Marx
Self-Government in Industry by G. D. H. Cole, edited by J. Corina
Workshop Organisation by G. D. H. Cole, edited by A. Marsh
Unemployment and Politics: A Study in English Social Policy, 1886–1914 by José Harris
Evaluating the Impact of Manpower Programs edited by Michael E. Borus
Economic Aspects of Manpower Training Programs by D. Hamermesh
Organization Design: Tlieory and Practice by Peter A. Clark
Sociology and Industrial Life by J. E. T. Eldridge
Man and Organization edited by John Child. George Allen & Unwin
Employment Conditions in Europe by Margaret Stewart
The P.E. Briefing Guide to Wages and Employment in the E.E.C 相似文献
Consciousness and Action among the Western Working Class, by Michael Mann
Grundrisse: Foundations of the Critique of Political Economy (Rough Draft), by Karl Marx
Self-Government in Industry by G. D. H. Cole, edited by J. Corina
Workshop Organisation by G. D. H. Cole, edited by A. Marsh
Unemployment and Politics: A Study in English Social Policy, 1886–1914 by José Harris
Evaluating the Impact of Manpower Programs edited by Michael E. Borus
Economic Aspects of Manpower Training Programs by D. Hamermesh
Organization Design: Tlieory and Practice by Peter A. Clark
Sociology and Industrial Life by J. E. T. Eldridge
Man and Organization edited by John Child. George Allen & Unwin
Employment Conditions in Europe by Margaret Stewart
The P.E. Briefing Guide to Wages and Employment in the E.E.C 相似文献
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介绍了近年来超声波在化学工业中的应用与进展,以及超声波的特征和超声波促进化学反应的基本原理,较为全面地总结了超声波在有机合成、聚合反应、结晶过程、萃取分离、超细粉体制备等方面的国内外应用情况,总结了超声外场付诸于化学工业所遇到的主要困难是对于超声化学理论知识的研究还不够成熟以及缺乏适用于工业化生产的超声化学反应器,提出解决问题的关键是需要大量学者对超声化学的反应机理方面进行更加深入的研究与探索。指出超声外场是一种新型的催化体系,超声化学具有广阔的应用前景。 相似文献