枳实标准汤剂质量研究

为更好地评价不同产地的枳实标准汤剂,建立了枳实标准汤剂中辛弗林含量及特征图谱的测定方法。采用高效液相色谱仪与InertSustain AQ-C_(18)(4.6 mm×250 mm, 5.0μm)色谱柱,以甲醇-磷酸二氢钾溶液为流动相,柱温为28℃,流速为1.0 mL/min,检测波长为225 nm,对枳实标准汤剂中辛弗林含量、特征图谱进行了测定。结果显示,15批枳实标准汤剂出膏率均值为15.14%,范围为10.50%～19.91%,RSD为19.31%;辛弗林含量(质量分数)均值为9.07 mg/g,范围为5.92～15.21 mg/g,RSD为33.05%;辛弗林含量转移率均值为22.65%,范围为10.24%～47.70%,RSD为45.92%;15批枳实标准汤剂共确定7个共有峰,各峰相对保留时间均在±5%内,相对峰面积RSD均大于100%,相似度为0.655～0.936。这表明,不同产地的枳实出膏率、辛弗林含量及含量转移率较稳定;不同产地的枳实标准汤剂各成分间差异较大。经方法学考察认为,枳实标准汤剂中辛弗林含量及特征图谱的测定方法稳定,具有较高的重复性、稳定性及可信度,可用于枳实标准汤剂的质量评价,可为进一步深入研究枳实配方颗粒提供参考。     

牛蒡子标准汤剂质量评价体系的建立

为了提高牛蒡子标准汤剂的质量标准,制备了15批牛蒡子标准汤剂,通过对牛蒡苷含量及指纹图谱的研究,建立了牛蒡子标准汤剂的质量评价体系。第一煎加入8倍水,浸泡30min,煎煮20min;第二煎加入6倍水,煎煮15min,经浓缩、干燥后制得标准汤剂,应用HPLC法测定牛蒡子标准汤剂中牛蒡苷的含量及指纹图谱。结果显示:15批牛蒡子标准汤剂中牛蒡苷的转移率为21.3%～33.3%,平均转移率为27.3%,出膏率为7.1%～11.3%,平均出膏率为9.4%;通过中药指纹图谱相似度评价系统,确定了11个共有峰,通过对照品指认出了5个色谱峰,分别为绿原酸、咖啡酸、3,5-O-二咖啡酰基奎宁酸、牛蒡苷、牛蒡苷元。所建立的评价体系,牛蒡子标准汤剂制备规范,样品质量稳定,指纹图谱相似度大于0.94,对提高牛蒡子配方颗粒的质量标准具有一定的参考价值。     

基于巴戟天配方颗粒的标准汤剂特征图谱

为了使巴戟天配方颗粒的质量标准更加科学规范,通过对15批产自不同地区的巴戟天饮片进行标准汤剂的制备,以及对标准汤剂干膏粉进行研究,确定了巴戟天标准汤剂的出膏率范围;采用高效液相色谱法对主含成分耐斯糖进行了含量测定,研究了巴戟天配方颗粒的HPLC特征图谱分析方法,并对特征谱图中的水晶兰苷进行了指认。结果表明,在以流动相作为提取溶剂、甲醇-水(二者体积比为3∶97)为流动相的条件下,耐斯糖含量的转移率范围为73.21%～94.49%,标准汤剂出膏率范围为49.05%～55.87%。基于巴戟天配方颗粒的标准汤剂特征图谱研究方法严谨、可行,更加科学地阐明了配方颗粒与标准汤剂研究的一致性。     

白鲜皮饮片标准汤剂质量评价体系构建

为了提高白鲜皮配方颗粒的质量标准,采用15批白鲜皮饮片标准汤剂,建立了质量评价体系。第1次加入10倍的水、浸泡30 min、煎煮20 min,第2次加入8倍的水、煎煮15 min,以标准化工艺制备标准汤剂,采用HPLC法测定黄柏酮和梣酮的含量及指纹图谱。结果显示:15批白鲜皮标准汤剂中黄柏酮的转移率为25.08%~44.08%,平均转移率为34.79%,标准偏差为5.37%;梣酮转移率为22.63%~32.86%,平均转移率为27.94%,标准偏差为3.56%;出膏率为20.56%~34.42%,平均出膏率为29.05%,标准偏差为3.33%。采用中药指纹图谱相似度评价系统进行指纹图谱测定,得到共有峰10个,指认出白鲜碱、黄柏酮、梣酮3个峰。由此可知,白鲜皮饮片标准汤剂的制备工艺规范,样品质量稳定,指纹图谱相似度大于0.92,可用于白鲜皮配方颗粒的质量控制,并为白鲜皮饮片标准汤剂的应用和其他根茎类饮片的研究提供参考。     

桑叶配方颗粒物质基准研究

桑叶配方颗粒迄今尚没有统一的质量标准。为提升桑叶配方颗粒的内在质量,对其物质基准评价方法进行了研究。选取具有代表性产地的15批桑叶制备物质基准,采用高效液相色谱法,以芦丁、异槲皮苷、紫云英苷作为评价指标,确定桑叶物质基准的出膏率范围、标志性成分含量及转移率范围,采用超高效液相色谱法,建立物质基准UPLC特征图谱,并对其主要成分进行指认。结果表明:15批物质基准中,芦丁转移率为19.94%～34.05%,异槲皮苷转移率为11.67%～43.58%,紫云英苷转移率为10.73%～43.05%;物质基准特征图谱中,标定了14个共有峰,指认出7个色谱峰,分别为新绿原酸、绿原酸、咖啡酸、芦丁、异槲皮苷、槲皮素-3-O-(6″-O-丙二酰基)-β-D-葡萄糖苷、紫云英苷。所建立的基准评价方法为桑叶配方颗粒质量标准的制定及其后续大规模生产提供了数据基础。     

佛手标准汤剂中两种成分的测定方法研究

为提高佛手配方颗粒的质量评价标准,利用佛手标准汤剂控制佛手配方颗粒的内在质量。以15批不同产地的佛手饮片为原料,制备佛手标准汤剂,建立含量测定方法,以柚皮苷、橙皮苷为指标成分,测定了15批佛手标准汤剂的相关含量。结果表明:柚皮苷、橙皮苷分别在0.025 1～0.125 5,0.160 5～0.802 3μg范围内线性关系良好(r=0.999 9),平均加样回收率分别为102.27%和101.48%,重复性考察RSD值分别为0.78%和0.89%,12 h稳定性考察RSD值分别为0.59%和1.46%。所提出的方法能同时测定柚皮苷和橙波苷两种成分,节约了分析时间,提高了佛手产品的质量标准。     

浮小麦配方颗粒特征图谱及4种核苷类成分定量研究

为了实现浮小麦配方颗粒的质量控制和评价,采用高效液相色谱法,以Waters XSelect^? HSS T3(4.6 mm×250 mm, 5μm)为色谱柱,在甲醇-水为流动相、梯度洗脱、柱温为30℃、流速为1.0 mL/min、检测波长为260 nm的条件下,建立了浮小麦配方颗粒的特征图谱及4种核苷类成分的含量测定方法。共确定了13批浮小麦配方颗粒特征图谱中的8个共有峰,并全部获得指认,分别为尿嘧啶、胞苷、次黄嘌呤、尿苷、腺嘌呤、鸟苷、色氨酸、腺苷,各共有峰相对保留时间的RSD均小于2.0%。尿嘧啶、尿苷、鸟苷、腺苷分别在0.001 9～0.047 3 mg/mL、0.003 9～0.098 2 mg/mL、0.002 8～0.070 1 mg/mL、0.002 9～0.073 0 mg/mL范围内线性关系良好(r=1.000 0),平均加样回收率分别为99.0%、100.7%、101.2%、101.8%。所建立的核苷类成分含量测定方法准确、高效、重复性好,可用于浮小麦配方颗粒的质量控制。     

合欢皮标准汤剂的HPLC指纹图谱研究

为全面反映合欢皮标准汤剂多种组分的面貌,明确合欢皮标准汤剂的HPLC指纹图谱,对15批合欢皮标准汤剂进行了HPLC指纹图谱测定及相似度评价。采用HPLC方法,色谱柱为Waters Symmetry shield RP C_(18)柱(4.6 mm×250 mm,5μm),以乙腈-0.04%磷酸溶液为流动相进行梯度洗脱,检测波长为210 nm,流速为1 mL/min,柱温为25℃,对照指纹图谱对合欢皮标准汤剂进行相似度评价及聚类分析。结果表明,15批合欢皮标准汤剂指纹图谱中呈现10个共有峰,相似度为0.967～0.998,表明合欢皮标准汤剂具有良好的一致性;此外,在10个共有峰中指认出(-)-丁香树脂酚-4-O-β-D-呋喃芹糖基-(1→2)-β-D-吡喃葡萄糖苷、异槲皮苷2个化学成分。因此,合欢皮标准汤剂指纹图谱反映了合欢皮标准汤剂的多组分面貌,具有良好的可行性,可为合欢皮配方颗粒的多组分质量控制提供参考。     

离子色谱法测定早强剂中氯离子和硫酸根的含量

本文建立了离子色谱法检测油田外加剂早强剂中氯离子和硫酸根的测定方法。采用AS19型分离柱(250mm×4mm)分离,以20mMKOH溶液为淋洗液,电导检测器检测。柱温、检测器温度为30℃。进样量为10μL,流速为1.0mL/min,采用峰面积定量。氯离子和硫酸根的检出限均为0.01mg/L,在2-25mg/L范围内具有良好的线性关系（相关系数分别为r2=0.9998和r2=0.9996）,加标回收率均在99%以上,相对标准偏差（R SD）为1.0%-1.2%。实验结果表明,此方法快速、简单,可便捷地应用于油田外加剂早强剂中氯离子和硫酸根含量的测定。     

反相色谱法检测利伐沙班片异构体含量

建立反相色谱法检测利伐沙班片异构体含量测定方法。采用高效液相色谱法,以CHIRALPAK IC(4.6★250mm5μm)为色谱柱,以乙腈为流动相;检测波长为250nm,柱温为25℃,流速为1.0mL/min。结果:异构体测定方法学研究表明,该方法专属性好;利伐沙班异构体在0.34μg/ml～4.53μg/ml的浓度范围内与其峰响应值呈良好的线性关系,平均回收率为101.2%(RSD=0.6%)。本方法符合方法学验证相关要求,精密度、耐用性等结果符合预定要求,可以有效检出利伐沙班片中异构体含量。     

增强Linux系统安全性的措施

L inux系统的安全取决于系统管理员如何来管理它。本文探讨了一系列可以增强安全性的技巧与策略 ,包括 :系统安装原则、BIOS安全、口令安全策略、设计帐户自动注销功能、文件系统和日志安全策略、使用 SSH及 TCP-WRAPPERS,隐藏系统信息、删除所有特殊帐户、关闭控制台程序、限制系统中的 SUID/ SGID程序等。本文最后向 L inux系统管理员提出了一些安全管理方面的建议     

Comparing FTTH access networks based on P2P and PMP fibre topologies

There is an ongoing discussion in the market which Next Generation Access (NGA) architecture best suits future needs and which investment and cost differences exist. The discussion can be subsumed as P2P vs. GPON, which is somewhat misleading as this article reveals. The discussion is driven by the fact that the high capital cost and the long asset life time of fibre mean that the technology choices made today will dominate the opportunities for telecommunication business of all market players, incumbents, competitors, content providers and business and residential users for many years in the future.The paper analyzes the cost and other differences between Fibre-to-the-Home (FTTH) access network architectures and their related different wholesale approaches by using the well-known and understood steady state approach applied in other NGA analyses in the past. In addition to the steady state analysis a dynamic cost evaluation is included taking into account the different investment behaviour of the FTTH architectures over time. The results describe investment and cost differences between architectures, incumbents and wholesale based competitive operators. The analysis has been performed for different geotypes (clusters) of decreasing population density in a representative European settlement structure.     

CIS与现代企业管理美学

概括性介绍了 ＣＩＳ（Ｃｏｒｐｏｒａｔｅ Ｉｄｅｎｔｉｔｙ Ｓｙｓｔｅｍ）的三大基本组成，并阐述了它与现代企业管理密不可分的相互联系及所处的举足轻重的地位，指出导入ＣＩＳ是现代企业谋求发展的重要手段。     

Divergent patterns of engagement in Internet standardization: Japan,Korea and China

This article analyzes the engagement of Japanese, Korean and Chinese participants in the development of Internet standards at IETF on the basis of four quantitative metrics: attendance, patenting, authorship and leadership. The results are strikingly divergent. Japanese involvement in Internet standardization began early and Japan was, for many years, second only to the U.S. in terms of IETF participation. Though Japanese participation has declined since the early 2000s, Japan remains a major contributor to IETF standardization. Korean involvement in IETF has always been significant, but below the levels of Japan and major European countries. Korean participation in IETF has also declined over the past decade, and has been dominated by one firm, Samsung. Though meaningful Chinese involvement in IETF did not begin until the mid-2000s, it has rapidly expanded in recent years. Today, China is a major player in numerous areas of Internet standardization in terms of three metrics (participation, patenting and leadership), and is rapidly gaining in terms of document authorship as well. Most of China׳s recent IETF involvement can be attributed to Huawei, though other Chinese firms have recently begun to increase their participation in the organization. Thus, contrary to some views that China׳s engagement with standardization is primarily one of indigenous innovation and “catching up”, China׳s experience with IETF demonstrates deliberate and effective engagement with a major Western standards-development organization on its own terms.     

快速成形技术的应用及热点分析

基于快速成形技术的原理,展示了快速成形技术在快速模具制造、金属零件直接成形、反求工程等领域的广泛应用,总结了快速成形制造技术研究的热点,即研发新材料和新设备、提高成形精度、建立RPM的反求工程系统、建立成形技术的统一标准和扩大成形技术的应用领域。     

Whose Image is it Anyway?: Some Considerations of the Curricular Importance of Subject Image in Secondary School Design and Technology Education

This paper explores the idea that a sense of school subject image is a necessary feature of curriculum management and a potent force for change. The discussion centres on the view that all school subjects have an image and that if those intimately involved with the subject do not control the image then someone else does! In such circumstances the image is the product of past encounters and old euphemisms and is unlikely to hold the changed realities.The UK developments in Design and Technology education (the term Design and Technology is used to denote the school subject defined under this heading by the UK National Curriculum, 1995) have created something of an image problem which has interesting international parallels. Some of these problems are due to clearly discernible internal tensions and an ambiguous relationship with other subject areas.Through greater attention to subject image internal controversies might be acknowledged and resolved, relationships with other subject areas can be more meaningfully understood and practitioners can be helped to make sense of curriculum change.     

Indigenous peoples’ nutrition transition in a right to food perspective

In indigenous communities the nutrition transition characterized by a rapid westernization of diet and lifestyle is associated with rising prevalence of chronic disease. Field work and literature reviews from two different policy environments, Argentina (Jujuy) and Canada (Nunavut), identified factors that add to indigenous peoples’ disease risk. The analytical framework was the emerging human right to adequate food approach to policies and programmes. Indigenous peoples’ chronic disease risk tends to increase as a result of government policies that infringe on indigenous peoples’ livelihoods and territories, undermining their economic system, values and solidarity networks. Policies intended to increase food security, including food aid, may also fuel the nutrition transition. There is a need to explore further the connection between well-intended policies towards indigenous peoples and the development of chronic diseases, and to broaden the understanding of the role that different forms of discrimination play in the westernization of their lifestyles, values and food habits. Food policies that take due account of indigenous peoples’ human rights, including their right to enjoy their culture, may counteract the growth of chronic disease in these communities.     

Diffusion and usage of public e-services in Europe: An assessment of country level indicators and drivers

We analyze the state of the art of indicators on e-government, e-health, e-procurement and e-participation. We survey the main methodological properties of these indicators, and highlight their heuristic potential. Further, we address empirically the issue of the explanation of the availability scores, i.e. how the supply of the various e-services in each country is affected by political, institutional and socio-economic differences, and is followed by actual usage. The econometric analysis uncovers the importance of broadband penetration and higher education as drivers for most of the types of e-services and users (citizens and businesses). Moreover, a corruption-free and agile public sector proves to be an important pre-condition for more effective supply and usage. Despite data limitations and the complexity of the underlying diffusion phenomena, our study is the first truly longitudinal contribution aimed at disentangling the common drivers of such an important phenomenon – the e-services availability and usage across European countries. As such, this work appears useful to inform the policy debate and practice, in a phase characterized by a prospective reorientation of the public e-services provision and policy agenda.     

一种高精度的频率标准比对系统

频率标准源可以提供精确的标准频率,在测定频率标准源的各项性能指标时,要求测试系统必须具有很高的比对精度。所设计的频率标准比对系统采取多级倍频 混频方式使频率偏差逐级扩大后再测量,从而避免了直接进行高次倍频的困难,提高了测量精度,可以对高精度的频率标准的准确度、长短期频率稳定度进行快速测量,是一种高精度时畴参数测量系统。     

HSE走进中国石油

企业管理水平的好坏直接影响着企业的经济效益,运用HSE管理能提高企业管理水平,HSE管理模式将健康,安全,环境三者视为一个有机的整体。HSE管理认为人的安全是第一位的,人是创造财富的原动力,是企业的最大财产,HSE管理体系强调的是“蝴蝶效应”。