复方岩白菜素含量及溶出速度的测定

目的:测定不同厂家生产的复方岩白菜素含量及溶出速度.方法:用分光光度法和转蓝法.结果:复方岩白菜素的含量分别为:83.98%、72.96%、78.93%、79.03%;30min时的溶出百分率分别为:74.3%、79.77%、73.35%、3.07%.结论:四种片剂含量偏低,普通片溶出度相近,缓释片溶出度相对较小.     

普卢利沙星片的质量标准研究

采用高效液相色谱法(HPLC)测定普卢利沙星片中普卢利沙星的含量及有关物质。使用紫外-可见分光光度法测量片剂溶出度,作为普卢利沙星片的质量控制标准的一种新方法。在片剂的含量测定中,3种浓度下回收率均良好,RSD=0.015%,空白辅料对主药测定无干扰。本品3批有关物质均小于1.0%;溶液浓度在(1～10)g/mL范围内,与吸光度值线性关系良好,A=0.097 8C+0.002,相关系数r=1。本品在45 min内溶出量达85%以上。建立的普卢利沙星片的含量、有关物质和溶出度测定方法简便、快速、准确。     

采用原研制剂制备米诺膦酸片及体外溶出度的一致性考察

制备米诺膦酸片,并以原研制剂为参比制剂,采用f_2相似因子法对两者体外溶出度的一致性进行考察.建立合适的体外溶出度测定方法,研究参比制剂的溶出情况,通过单因素试验对辅料的用量进行筛选,制备出米诺磷酸片.比较自制品与原研制剂在不同溶出介质中的溶出行为,评价两者体外溶出行为的相似性.结果表明:制备的米诺膦酸片剂与原研制剂在4种不同pH值溶出介质中的溶出相似因子f_2均大于50;制备的米诺膦酸片剂与原研制剂体外溶出行为相似.     

瑞舒伐他汀钙片的制备与质量考察评价

制备瑞舒伐他汀钙片,用HPLC建立溶出度测定方法,考察样品质量稳定性及不同p H条件下的溶出度,并与原研药进行对比评价.经处方筛选,利用直压法制备瑞舒伐他汀钙片,采用高效液相色谱法检测溶出度,计算相似因子,同时绘制三维曲面图,对比自制样品与原研药的溶出特性.自制的三批样品,在不同溶出介质中的相似因子均在50以上.自制片剂与原研药体外溶出相似,自制产品质量稳定,接近原研药水平.     

环糊精诺氟沙星片剂的制备及溶出度考察

采用正交实验优化诺氟沙星片剂的制备条件,获得最佳处方:淀粉为填充剂,质量分数为5%的羧甲基淀粉钠(CMS-Na)为崩解剂,1%的滑石粉为润滑剂,10%的淀粉浆为黏合剂.为增大诺氟沙星药物的溶出,采用研磨法制备β-环糊精诺氟沙星包合物,经湿法制粒压片工艺制备环糊精诺氟沙星片剂.环糊精诺氟沙星片的片重差异、脆碎度和崩解时限均符合2010版中国药典要求,其中诺氟沙星的溶出度得到有效改善,解决了诺氟沙星片剂对照组的主药溶出度低的问题.采用优化处方和制备工艺,制备环糊精诺氟沙星片,可改善难溶性诺氟沙星药物的溶出度且工艺简单易行.     

阿奇霉素纳米晶体片剂的制备及其质量评价

以纳米晶体技术为基础制备阿奇霉素纳米晶体片剂,以期提高阿奇霉素的溶出度。采用介质研磨法制备阿奇霉素纳米晶体,在此基础上制备阿奇霉素纳米晶体片剂。参考《中华人民共和国药典》对其质量进行评价,采用浆法测定溶出度,HPLC法测定含量和有关物质。通过影响因素试验、加速试验及留样试验,考察片剂的稳定性。自制阿奇霉素纳米晶体片剂符合《中华人民共和国药典》2010版二部附录片剂项下要求,溶出度较上市片剂显著提高。影响因素试验结果表明,自制片剂对高温和强光较稳定,但对环境湿度较为敏感。加速试验及留样试验结果表明,自制片剂6个月内较为稳定,贮存时应置于密闭、干燥阴凉处。     

尿嘧啶替加氟片溶出度方法的考察

建立尿嘧啶替加氟片中替加氟和尿嘧啶的溶出度方法.采用转篮和浆法,以水为溶出介质,采用高效液相色谱法测定尿嘧啶替加氟片溶出度.结果表明,两种方法均可使尿嘧啶替加氟片二个组分很快溶出,30 min时二个组分的累积溶出量均达到75%以上,但方法之间存在差异.浆法更适合用于尿嘧啶替加氟片溶出度的测定.     

乌苯美司口腔崩解片的研制

目的探讨乌苯关司口腔崩解片的制备工艺,优化最佳处方;检测片剂的溶出度.方法以崩解时限为主要指标,通过单因素试验及正交试验设计优化乌苯关司口腔崩解片的最佳制备工艺;利用溶出仪(稍作改良)检测法检测口腔崩解片的溶出度.结果 MCC:L-HPC:CMC-Na(9:1:0.75)作为崩解剂,湿法制粒压片制得的乌苯美司口腔崩解片,体外平均崩解时限为21 s,置于口腔内25 s即可崩解,无砂砾感;片剂体外溶出度10 min溶出基本完全.结论乌苯美司口腔崩解片于口腔内可迅速崩解,制备工艺简单,有效改善了药物粉末的流动性,适宜于生产.     

阿哌沙班片溶出度测定方法研究

建立了以高效液相色填充谱法测定阿哌沙班片溶出度的测定方法,采用0.1%CTAB-pH 6.8的磷酸盐缓冲溶液900mL为溶出介质,温度为37℃±0.5℃,转速为75r/min,溶出介质经脱气处理,取样时间为30min.结果显示,6批供试品及对照药品30min的溶出度均在80%以上,均符合规定.方法专属性强,灵敏度高,结果准确,可用于测定阿哌沙班片的溶出度.     

聚乙二醇对葛根黄豆苷元体外溶出的影响

以聚乙二醇为载体材料,制备了葛根黄豆苷元固体分散体,采用紫外分光光度法测定其体外溶出度,分别研究了聚乙二醇的相对分子质量、药物和载体的比例和固体分散体的制备方法对药物溶出的影响.实验结果发现:固体分散体中药物的溶出度均高于原料药;药物的溶出度随聚乙二醇相对分子质量的增大而增大、随载体用量提高而增大;不同的固体分散体制备方法对药物的溶出度影响不大.     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

橡胶颗粒沥青混合料低温抗裂性试验研究

以AC-13级配为基础,将橡胶颗粒代替部分集料掺入混合料中,以低温弯曲试验为评价方法对不同橡胶颗粒掺量下沥青混合料的低温抗裂性进行研究,并引入应变能密度值对混合料的低温抗裂性进行综合评价.试验结果表明:橡胶颗粒沥青混合料试件的破坏微应变均超过2 300,满足冬寒区的技术指标;无论是否掺加橡胶颗粒,随着温度的下降,沥青混合料破坏时的最大弯拉强度增大,弯拉应变降低,劲度模量增大;弯曲应变能密度在胶粒掺量为1%左右时具有较大的弯曲应变能密度值,此时橡胶颗粒沥青混合料具有较好的低温抗裂性.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.