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论《沙人》的“创伤体验”与“创伤叙事”
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作者 黄峰 《人文杂志》 CSSCI 北大核心 2016年第5期66-73,共8页
19世纪德国作家E.T.A.霍夫曼在书信体小说《沙人》中描述了主人公纳撒内尔在童年时期的一段可怕经历,影响到主人公最终走向自杀的悲剧故事。从创伤批评理论的视角分析小说主人公的"创伤体验"以及后续的自杀行为,不仅可以发现... 19世纪德国作家E.T.A.霍夫曼在书信体小说《沙人》中描述了主人公纳撒内尔在童年时期的一段可怕经历,影响到主人公最终走向自杀的悲剧故事。从创伤批评理论的视角分析小说主人公的"创伤体验"以及后续的自杀行为,不仅可以发现童年时期的创伤心理对个体后期行为及思维模式的深刻影响,也可窥察到这一创伤体验的的集体性内涵,也将清楚作者本人对内在创伤的直视与拯救。在呈现创伤体验的同时,叙事主体总是力图完成自我治愈的目的。 展开更多
关键词 《沙人》 创伤批评 创伤体验 创伤叙事
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Regarding the Regulatory Sandbox Route and Mechanism for Governance of Artificial Intelligence
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作者 Ye Xuanhan 《科技与法律(中英文)》 CSSCI 2024年第5期136-148,共13页
The main challenge in AI governance today is striking a balance between controlling AI dangers and fostering AI innovation.Regulators in a number of nations have progressively extended the regulatory sandbox,which was... The main challenge in AI governance today is striking a balance between controlling AI dangers and fostering AI innovation.Regulators in a number of nations have progressively extended the regulatory sandbox,which was first implemented in the banking sector,to AI governance in an effort to reduce the conflict between regulation and innovation.The AI regulatory sandbox is a new and feasible route for AI governance in China that not only helps to manage the risks of technology application but also prevents inhibiting AI innovation.It keeps inventors'trial-and-error tolerance space inside the regulatory purview while offering a controlled setting for the development and testing of novel AI that hasn't yet been put on the market.By providing full-cycle governance of AI with the principles of agility and inclusive prudence,the regulatory sandbox offers an alternative to the conventional top-down hard regulation,expost regulation,and tight regulation.However,the current system also has inherent limitations and practical obstacles that need to be overcome by a more rational and effective approach.To achieve its positive impact on AI governance,the AI regulatory sandbox system should build and improve the access and exit mechanism,the coordination mechanism between the sandbox and personal information protection,and the mechanisms of exemption,disclosure,and communication. 展开更多
关键词 artificial intelligence governance regulatory sandbox agile regulation inclusive prudential regulation access and exit mechanism coordination mechanism
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Analysis and assessment of land desertification in Xinjiang based on RS and GIS 被引量:5
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作者 LIHu WANGXiaofeng GA0Yaqi 《Journal of Geographical Sciences》 SCIE CSCD 2004年第2期159-166,共8页
The land desertification in Xinjiang was monitored and analyzed based on RS and GIS techniques. Satellite data interpretation was adopted to obtain the general situation of Xinjiang’s land desertification in assistan... The land desertification in Xinjiang was monitored and analyzed based on RS and GIS techniques. Satellite data interpretation was adopted to obtain the general situation of Xinjiang’s land desertification in assistance with the sampling method and on-the-spot investigations. Related monitoring and investigations showed that Xinjiang was facing with severe wide range land desertification, and its desertified area made up 77.08% of the total monitoring area. As for land types, the desertified farmland accounted for 1.92% of the total monitoring area, desertified woodland 4%, desertified grassland 45%, and unused land 49%. Accordingly, as for desertification degrees, non-desertified land occupied 22.92%, weak desertified land 5.69%, medium-degree desertified land 16.58%, severe desertified land 33.19% and super severe desertified land 21.61%. Finally, as for inducing factors, wind-eroded desertification made up 58.23%, water-eroded desertification 8.69%, salinization desertification 6.52% and frozen-melt eroded desertification 3.64%. Xinjiang’s land desertification tended to get worse and the harnessing mission remained hard. 展开更多
关键词 XINJIANG land desertification remote sensing GIS monitoring and analysis
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Spatial Pattern Evolution and Casual Analysis of County Level Economy in Changsha-Zhuzhou-Xiangtan Urban Agglomeration, China 被引量:8
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作者 DONG Minghui ZOU Bin +3 位作者 PU Qiang WAN Neng YANG Lingbin LUO Yanqing 《Chinese Geographical Science》 SCIE CSCD 2014年第5期620-630,共11页
In order to evaluate whether or not the county units′ economy in the Changsha-Zhuzhou-Xiangtan(Chang-Zhu-Tan) Urban Agglomeration was growing as expected, this study analyzed the spatial economy pattern at county-lev... In order to evaluate whether or not the county units′ economy in the Changsha-Zhuzhou-Xiangtan(Chang-Zhu-Tan) Urban Agglomeration was growing as expected, this study analyzed the spatial economy pattern at county-level by using the Exploratory Spatial Data Analysis(ESDA) method. In this process, the global Moran′s I and local Getis-Ord G*i indexes were employed to analyze indicators including per capita GDP and three industrials(i.e. primary, secondary and tertiary industry) from 2000 to 2010. The results show that: 1) the county units′ economy in the Chang-Zhu-Tan Urban Agglomeration has exhibited a strong spatial autocorrelation and an accelerated integration trend since 2008(Moran′ s I increased from 0.26 to 0.56); 2) there is a significant difference in economy development between the northern and southern county units in the Chang-Zhu-Tan Urban Agglomeration: the hotspot zone with high economic level was formed among the northern county units whereas the coldspot zone with low economic level was located in the southern areas. This difference was caused primarily by the increasingly prominent economic radiation effect of Changsha ′upheaval′; 3) town density, secondary industry, and the integration policy are the major contributors driving the evolution of the spatial economy pattern in the Chang-Zhu-Tan Urban Agglomeration. 展开更多
关键词 spatial autocorrelation spatial heterogeneity urban agglomeration county-level economy Changsha-Zhuzhou-Xiangtan (Chang-Zhu-Tan) China
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Dissolution Improvement of Cisapride by Solid Dispersion with HPMC
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作者 魏振平 毛世瑞 +1 位作者 毕殿洲 李勇 《Journal of Chinese Pharmaceutical Sciences》 CAS 2004年第4期254-258,共5页
To prepare a solid dispersion of cisapride with hydroxypropylmethyl cellulose(HPMC E5 LV) as carrier for the purpose of accelerating the in vitro drug release by means ofimproving the solubility of the model drug. Met... To prepare a solid dispersion of cisapride with hydroxypropylmethyl cellulose(HPMC E5 LV) as carrier for the purpose of accelerating the in vitro drug release by means ofimproving the solubility of the model drug. Methods Alcohol and simulated gastric fluid (SGF) wereused to dissolve cisapride and HPMC in order to make the model drug dispersed homogeneously in thecarrier. The HPMC-cisapride solid dispersion was then obtained by conventional solvent evaporationmethod. Powder X-ray diffraction (XRD) was used to measure the diffraction peaks of pure carrier,pure cisapride, physical mixture of HPMC with cisapride (4:1), and HPMC-cisapride solid dispersion(4:1) to confirm the crystal existence. The solubility of pure drug and HPMC-cisapride soliddispersion was measured with water, SGF and simulated intestinal fluid (SIF) . The in vitro drugreleases of the sustained release tablet prepared with pure cisapride or HPMC-cisapride soliddispersion were investigated with water and SGF as media, respectively. Results No diffraction peakswere found by X-ray diffraction in the HPMC-cisapride solid dispersion (4:1), indicating that thedrug existed in an amorphous form at that drug-carrier ratio. Compared with the pure drug, thesolubilities of HPMC-cisapride solid dispersion are increased by 239.4% in SGF, 132.6% in water, and117.9% in SIF. According to the in vitro drug release, the sustained release tablet prepared withHPMC-cisapride solid dispersion had a faster drug release than did that prepared with pure drug. Thein vitro drug release profiles were found to comply with Higuchi's rule. Conclusion The in vitrodrug release of the sustained release tablet made by HPMC-cisapride solid dispersion is improvedowing to the increased drug solubility. 展开更多
关键词 CISAPRIDE HPMC E5 LV solid dispersion
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Daily and Monthly Suspended Sediment Load Predictions Using Wavelet Based Artificial Intelligence Approaches 被引量:6
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作者 Vahid NOURANI Gholamreza ANDALIB 《Journal of Mountain Science》 SCIE CSCD 2015年第1期85-100,共16页
In the current study, the efficiency of Wavelet-based Least Square Support Vector Machine (WLSSVM) model was examined for prediction of daily and monthly Suspended Sediment Load (SSL) of the Mississippi River. For... In the current study, the efficiency of Wavelet-based Least Square Support Vector Machine (WLSSVM) model was examined for prediction of daily and monthly Suspended Sediment Load (SSL) of the Mississippi River. For this purpose, in the first step, SSL was predicted via ad hoc LSSVM and Artificial Neural Network (ANN) models; then, streamflow and SSL data were decomposed into sub- signals via wavelet, and these decomposed sub-time series were imposed to LSSVM and ANN to simulate discharge-SSL relationship. Finally, the ability of WLSSVM was compared with other models in multi- step-ahead SSL predictions. The results showed that in daily SSL prediction, LSSVM has better outcomes with Determination Coefficient (DC)=o.92 than ad hoc ANN with DC=o.88. However unlike daily SSL, in monthly modeling, ANN has a bit accurate upshot. WLSSVM and wavelet-based ANN (WANN) models showed same consequences in daily and different in monthly SSL predictions, and adding wavelet led to more accuracy of LSSVM and ANN. Furthermore, conjunction of wavelet to LSSVM and ANN evaluated via multi-step-ahead SSL predictions and, e.g., DCLssVM=0.4 was increased to the DCwLsSVM=0.71 in 7- day ahead SSL prediction. In addition, WLSSVM outperformed WANN by increment of time horizon prediction. 展开更多
关键词 Suspended Sediment Load Least SquareSupport Vector Machine (LSSVM) WAVELET ArtificialNeural Network (ANN) Mississippi River
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Acalculous cholecystitis due to Salmonella enteritidis
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作者 Maria Lourdes Ruiz-Rebollo Gloria Sánchez-Antolín +4 位作者 Félix García-Pajares Maria Antonia Vallecillo-Sande Pilar Fernández-Orcajo Rosario Velicia-Llames Agustín Caro-Patón 《World Journal of Gastroenterology》 SCIE CAS CSCD 2008年第41期6408-6409,共2页
Acute acalculous cholecystitis (AAC) is defi ned as an acute infl ammation of the gallbladder in the absence of stones. We herein report a case of a young man who developed AAC after a Salmonella enteritidis gastroint... Acute acalculous cholecystitis (AAC) is defi ned as an acute infl ammation of the gallbladder in the absence of stones. We herein report a case of a young man who developed AAC after a Salmonella enteritidis gastrointestinal infection. 展开更多
关键词 CHOLECYSTITIS Young adult INFECTIOUS Salmonella enteritidis
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VARIATION IN FLOW AND SEDIMENT OF DASHA RIVER AND INFLUENCE OF HUMAN ACTIVITIES ON IT IN SOUTHWEST REGION OF ANHUI PROVINCE
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作者 CHEN Bao-ping ZHANG Jian-chun 《Chinese Geographical Science》 SCIE CSCD 2006年第2期109-115,共7页
Soil and water loss is now a major environmental problem in many areas of China, especially in the area of the Dabie Mountain, Anhui Province, which results in environmental degradation and does harm to the people's ... Soil and water loss is now a major environmental problem in many areas of China, especially in the area of the Dabie Mountain, Anhui Province, which results in environmental degradation and does harm to the people's life and production there. Based on the observational records from the Dasha River, the authors analyze the character of the variation in flow and sediment in different flood and dry seasons from 1970 to 2000. The result shows that human activities had significantly reduced the sediment discharge and sediment module, and increased the runoff in low-water seasons since the 1980s. The average contribution rate ofhnman activities to decreasing sediment was 65.67%, and at the same period the contribution rate of runoff and rainfall was about 34.33%. Therefore, it is necessary to take the biological and engineering measures to solve the problem of soil and water loss in the Dasha River watershed. 展开更多
关键词 river flow sediment discharge human activities effect Dasha River southwest of Anhui Province
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It Is Easy When You Are a Christian: Badeng Kenyah Conversion to Christianity
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作者 Tan Chee-Beng 《Cultural and Religious Studies》 2016年第4期254-272,共19页
In this article, 1 explore how the Long Geng Badeng Kenyah community of Sarawak converted to Christianity even though there was no sustained missionary persuasion from the outside. Over a period of study, I eventually... In this article, 1 explore how the Long Geng Badeng Kenyah community of Sarawak converted to Christianity even though there was no sustained missionary persuasion from the outside. Over a period of study, I eventually accept the simple emic explanation that "it is easy when you are a Christian" to be an important explanation. Central to this view is that Christianity provides an alternative religion that allows the people to avoid the need to observe the many troublesome taboos that hinder frequent traveling and engaging in various kinds of economic activities. The influence of relatives is an important factor, too, and as more people become Christians, the traditional Bungan followers lose the support to continue with the traditional religion and eventually almost all follow their relatives to adopt the new religion, which they find do not hinder practicing their culture other than replacing the traditional worship with the Christian way. The ethnographic study provides the opportunity to relate to recent scholarship on the anthropology of Christianity, and facilitates anthropological reflection on the study of cultural change, in particular, in relation to the work of Marshall Sahlins. 展开更多
关键词 Christian conversion Adet Bungan Badeng Kenyah SARAWAK SIB Church
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HISTORICAL DESERTIFICATION PROCESS IN HEXI CORRIDOR,CHINA 被引量:3
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作者 WANG Nai-ang ZHANG Chun-hui LI Gang CHENG Hong-yi 《Chinese Geographical Science》 SCIE CSCD 2005年第3期245-253,共9页
Over the last 2000 years, approximately 38 ancient cities were abandoned through desertification in Hexi Corridor, Northwest China. Among them, 21.05% were abandoned during the Northern and Southern Dynasties, 21.05% ... Over the last 2000 years, approximately 38 ancient cities were abandoned through desertification in Hexi Corridor, Northwest China. Among them, 21.05% were abandoned during the Northern and Southern Dynasties, 21.05% during the end of the Tang Dynasty and the Five Dynasties, and 57.9% during the Ming and Qing dynasties. At the same time, main lakes were shrinking rapidly from the 5th Century to the 6th Century and the end of the Qing Dynasty. The climate in these periods was relatively arid and cold with frequent dusts. The phase of these changes indicated that there were three periods of desertification enlargement in the northern China. They were Northern and Southern Dynasties, the end of Tang Dynasty and Five Dynasties, the Ming and Qing dynasties. The macro-process of desertification in the study area was controlled mainly by the climatic changes. But from the facts that the population density in the middle of Qing Dynasty had exceeded the critical index of population pressure in arid area and the usage rate of water resources had exceeded 40% in Hexi Corridor, this paper also suggests that human activities have played an important role in desertification processes of the study area mainly during the recent 300 years. 展开更多
关键词 historical desertification climate change human activities Hexi Corridor
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^(137)Cs Finger Printing Technique for Erosion and Sedimentation Studies 被引量:5
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作者 LONG Yi ZHANG Xinbao +1 位作者 WEN Anbang HE Xiubin 《Journal of Mountain Science》 SCIE CSCD 2012年第1期34-40,共7页
137 Cs is an artificial radionuclide with a half-life of 30.2 years,which was released into the environment as a byproduct of atmospheric testing of nuclear weapons during the period of 1950s to 1970s with a peak depo... 137 Cs is an artificial radionuclide with a half-life of 30.2 years,which was released into the environment as a byproduct of atmospheric testing of nuclear weapons during the period of 1950s to 1970s with a peak deposition in 1963.137 Cs fallout was strongly and rapidly adsorbed by soil particles when it deposited on the ground mostly with precipitation.Its following movements will associate with the adsorbed particles.137 Cs tracing technique has been widely used in soil erosion and sedimentation studies since 1980s.This paper introduces the basis of the technique and shows several case studies of assessment of soil erosion rates,investigation of sediment sources and dating of reservoir deposits by using the technique in the Loess Plateau and the Upper Yangtze River Basin. 展开更多
关键词 137 Cs soil and sedimentation the Loess Plateau the Upper Yangtze River Basin
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Validation of a Value Management Approach Developed for the Saudi Public Sector
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作者 Mohammed Auda S Alalshikh 《Journal of Civil Engineering and Architecture》 2014年第2期197-206,共10页
A VM (value management) approach was developed that better suits the culture and the context of the SPS (Saudi Public Sector). This approach provided a comprehensive assessment of VM at institutional, organization... A VM (value management) approach was developed that better suits the culture and the context of the SPS (Saudi Public Sector). This approach provided a comprehensive assessment of VM at institutional, organizational and project levels. This paper illustrates the procedures that were used to validate the developed VM approach. For the institutional and organizational levels, the VM approach was validated by conducting telephone interviews with three experts from three organizations that use VM and with two senior managers from the MOF (Ministry of Finance). Mainly, it was found that the MOF should be supported by experts to set up a centre of excellence that can set VM policy, guidelines and standards for the promotion of VM in the SPS, in order to ensure achieving value for money spent in SPS projects. The developed VM approach, as it would be applied at the project level, was presented to 11 experts, all of whom completed a validation questionnaire and presented their comments. Subsequently, the questionnaires were analyzed and the VM approach was amended to reflect the inputs provided by these experts. It was concluded that VM should be applied at least twice on SPS projects. Firstly, it is to review and structure strategic and project briefs to sort out soft issues, and secondly, it is to optimize project designs and sort out hard issues. 展开更多
关键词 Value management value engineering project management Saudi public sector Saudi Arabia.
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Sandy Desertification Status and its Driving Mechanism in North Tibet Plateau
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作者 DONGYuxiang 《Journal of Mountain Science》 SCIE CSCD 2004年第1期65-73,共9页
As the main body of Qinghai-Tibetan Plateau, North Tibet Plateau is one of three major sandy desertification regions in China and also a representative sandy desertification zone of Qinghai-Tibet Plateau. Accordingly,... As the main body of Qinghai-Tibetan Plateau, North Tibet Plateau is one of three major sandy desertification regions in China and also a representative sandy desertification zone of Qinghai-Tibet Plateau. Accordingly, it is an important region for the study of recent sandy desertification processes and formation mechanism. From such aspects as desertified land types, areas and distributions etc., this paper analyses in detail the sandy desertification status on North Tibet Plateau, and qualitatively and quantitatively deals with the main factors that affect recent sandy desertification processes and the driving mechanism. Research results show that North Tibet Plateau is an important sandy desertification region in China characterized with large desertified land areas, diversified types, high severity, extensive distributions and serious damages. Sandy desertification occurrence and development resulted from combined effects of natural factors, anthropogenic factors, natural processes and man-made processes, of which climatic change is the main driving force. 展开更多
关键词 North Tibet Plateau desertification status driving force
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Cyclooxygenase-2 expression as a predictor of outcome in colorectal carcinoma 被引量:3
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作者 Jaudah Al-Maghrabi Abdelbaset Buhmeida +4 位作者 Eman Emam Kari Syrjnen Abdulrahman Sibiany Mohmmad Al-Qahtani Mahmoud Al-Ahwal 《World Journal of Gastroenterology》 SCIE CAS CSCD 2012年第15期1793-1799,共7页
AIM:To correlate cyclooxygenase-2(COX-2)expression profile with clinical and pathological variables to assess their prognostic/predictive value in colorectal carcinoma(CRC).METHODS:Archival tumor samples were analyzed... AIM:To correlate cyclooxygenase-2(COX-2)expression profile with clinical and pathological variables to assess their prognostic/predictive value in colorectal carcinoma(CRC).METHODS:Archival tumor samples were analyzed using immunohistochemistry for COX-2 expression in 94 patients with CRC.Patients were diagnosed and treatedat the Departments of Surgery and Oncology,King Abdulaziz University Hospital,Saudi Arabia.RESULTS:Fifty-six percent of the tumors showed positive cytoplasmic COX-2 expression,whereas 44%of cases were completely COX-2-negative.There were no significant correlations between COX-2 expression and sex,age,grade or tumor location.However,COX-2 expression revealed a significant correlation with tumor stage(P=0.01)and distant metastasis(P=0.02),and a borderline association with lymph node involvement(P =0.07).Tumors with high COX-2 expression showed a higher recurrence rate than tumors with no expression(P<0.009).In univariate Kaplan-Meier survival analysis,there was a significant(P=0.026)difference in disease-free survival between COX-2-positive and negative tumors in favor of the latter.COX-2 expression did not significantly predict disease-specific survival,which was much shorter for COX-2-positive tumors.In multivariate(COX)models,COX-2 did not appear among the independent predictors of disease-free survival or disease-specific survival.CONCLUSION:COX-2 expression seems to provide useful prognostic information in CRC,while predicting the patients at high risk for recurrent disease. 展开更多
关键词 Colorectal carcinoma CYCLOOXYGENASE-2 IMMUNOHISTOCHEMISTRY Disease outcome Adjuvant therapy
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Antimicrobial Susceptibilities of Salmonella spp. Isolated from Chicken Meat Samples
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作者 F. Kaynak Onurda B. Er +3 位作者 S. Ozgen B. Demirhan U. Abbasoglu A. Bayhan Oktem 《Journal of Food Science and Engineering》 2011年第2期135-140,共6页
The aim of this study was to determine presence of Salmonella spp. in chicken meat samples collected from Ankara, Turkey and determine the susceptibility of the Salmonella isolates to some antimicrobial agents. For th... The aim of this study was to determine presence of Salmonella spp. in chicken meat samples collected from Ankara, Turkey and determine the susceptibility of the Salmonella isolates to some antimicrobial agents. For this purpose, 127 chicken samples were collected from local markets. Investigation of Salmonella was done according to horizontal method, the guidelines of the method recommended by International Standards Organization (ISO). Antimicrobial susceptibilities of Salmonella spp. was performed with microdilution method according to the guidelines of CLSI M100-SI8. Ampicillin, gentamicin sulphate, ofloxacin, levofloxacin, ciprofloxacin, enrofloxacin, tetracycline, ceftriaxon, amoxicillin/clavulanic acid and trimethoprim/sulfamethoxazole were used in the study. Salmonella spp. was isolated from 5 (3.94%) of the 127 chicken meat samples. Although our findings are not within Turkish Food Codex (TFC) values, lower number of samples that involve Salmonella spp. indicates an improvement in the hygienic conditions in Turkey. Among 5 isolates, one isolate was sensitive to all antimicrobial agents tested. 2 isolates exhibited multidrug resistance. Successfully, all the isolates were sensitive to quinolones as a good result in spite of the reported reduced susceptibility from different regions of the world. However, this study should be improved with more chicken samples and Salmonella spp. isolate numbers to support these results. 展开更多
关键词 SALMONELLA chicken meat SUSCEPTIBILITY ANTIMICROBIAL minimum inhibitory concentration.
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The Relationship Between Military Expenditure and Economic Growth in Four Asian Countries 被引量:1
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作者 Mahdi Safdari Javad Keramati Majid Mahmoodi 《Chinese Business Review》 2011年第2期112-118,共7页
In this study, we use the ARDL bounds testing procedure suggested by Pesaran (2001) and modified version of the Granger causality test proposed by Toda and Yamamoto (1995) to test the robustness of the causality e... In this study, we use the ARDL bounds testing procedure suggested by Pesaran (2001) and modified version of the Granger causality test proposed by Toda and Yamamoto (1995) to test the robustness of the causality effect between military expenditure and economic growth in 4 Asian countries, two industrial countries (South Korea and Malaysia), and others are developing countries (Iran and Saudi Arabia), from 1988 to 2006 years, data series obtained from word development indicator (WDI). With respect to that military expenditure can affect economic growth so increase in GDP can increase or decrease military expenditure, too. We investigate the causality relationship between military expenditure and economic growth because the purpose of military expenditures is to provide national security. The results show that Iran and Saudi Arabia don't have any causality relationship between military expenditure and economic growth. The results of South Korea show a unidirectional relationship from LGDP (Logarithm of real GDP) and LGDPK (logarithm of real GDP per capita) to military expenditure, and in Malaysia there is unidirectional relationship from LGDPK to military expenditure. The comparison of these results, we can say that developing countries don't have meaningful relationship between military expenditure and economic growth, but we can find unidirectional or bidirectional relationship between military expenditure and economic growth in industrial countries. 展开更多
关键词 economic growth military expenditure ARDL bound test
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Liquid chromatography coupled with mass spectrometry method for the simultaneous quantification of irbesartan and hydrochlorothiazide in human plasma 被引量:2
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作者 张睿瑞 陈晓辉 +4 位作者 李清 刘文涛 杨雯雯 毕开顺 孙立新 《Journal of Chinese Pharmaceutical Sciences》 CAS 2011年第4期360-367,共8页
A simple and sensitive high-performance liquid chromatography mass spectrometry(LC-MS)method for the simultaneous determination of irbesartan and hydrochlorothiazide in human plasma was developed and applied to a ph... A simple and sensitive high-performance liquid chromatography mass spectrometry(LC-MS)method for the simultaneous determination of irbesartan and hydrochlorothiazide in human plasma was developed and applied to a pharmacokinetic study. Acetaminophen was used as the internal standard(IS).Sample pretreatment using liquid-liquid extraction with ethyl acetate was used.The analysis was carried out on an Elite SinoChrom ODS-BP C_(18)column with a mobile phase composed of acetonitrile-water (35:65,v/v).Target ions were [M-H]^-m/z 427.25 for irbesartan,[M-H]^-m/z 295.95 for hydrochlorothiazide and [M-H]^- m/z 150.05 for the IS via an electrospray ionization(ESI)source.The intra-and inter-day precision(RSD%)was below 14.5% for irbesartan and hydrochlorothiazide,and the accuracy(RE%)was less than 1.9% and-2.0% for irbesartan and hydrochlorothiazide,respectively.The linear calibration curves were obtained in the concentration range of 10-5000 ng/mL (r0.99)for irbesartan and 1-200 ng/mL(r0.99)for hydrochlorothiazide with the lower limit of quantification(LLOQ)of 10 ng/mL and 1 ng/mL,respectively.The method was applied to a clinical pharmacokinetic study of a tablet containing irbesartan and hydrochlorothiazide in healthy Chinese volunteers after oral administration. 展开更多
关键词 HPLC-MS IRBESARTAN HYDROCHLOROTHIAZIDE PHARMACOKINETICS Human plasma
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Phosphorus Loss from Dry Sloping Lands of Three Gorges Reservoir Area, China 被引量:4
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作者 HU Zheng-Feng GAO Ming +1 位作者 XIE De-Ti WANG Zi-Fang 《Pedosphere》 SCIE CAS CSCD 2013年第3期385-394,共10页
Eutrophication in the Three Gorges Reservoir has become a serious issue, and phosphorus (P) is the nutrient thought to be primarily responsible although there are few studies about P loss from the mostly sloping farml... Eutrophication in the Three Gorges Reservoir has become a serious issue, and phosphorus (P) is the nutrient thought to be primarily responsible although there are few studies about P loss from the mostly sloping farmlands of the area. This work investigated the amounts and forms of P loss from 9 farmlands with the slopes of 4°, 9°, and 17° in a small watershed, Wangjiagou in Fuling District, Chongqing of China. The slope of the relationship between runoff and rainfall increased with field slope; i.e., there was a significant interaction between the effects of rainfall and field slope on water export. For sediment export by surface runoff, there was no interaction between field slope and rainfall, and the intercept of the relationship between rainfall and sediment loss was significantly different for the 3 slopes. The main P loss was from sediments, regardless of slope. In the runoff water, particulate P was the largest P fraction, and its loss was greatest from the steepest land and least from the flattest. The release of total P and available P from sediments followed the same trend. The P loss during May to July in Wangjiagou was more than 60% of the annual total. 展开更多
关键词 agricultural production area EROSION nutrient loss purple soil soil loss
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Development and validation of a novel UPLC-MS/MS method for the simultaneous determination of fluticasone propionate and salmeterol in human plasma
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作者 高宇雄 丁黎 +1 位作者 梁文忠 蒋华芳 《Journal of Chinese Pharmaceutical Sciences》 CAS CSCD 2017年第4期271-283,共13页
Combined administration of fluticasone propionate and salmeterol xinofoate has been widely used for the treatment of asthma in recent decades. In this investigation, we developed and validated a novel and sensitive ul... Combined administration of fluticasone propionate and salmeterol xinofoate has been widely used for the treatment of asthma in recent decades. In this investigation, we developed and validated a novel and sensitive ultra performance liquid chromatography-tandem mass spectrometry (UPLC-MS/MS) method for simultaneous determination of fluticasone propionate and salmeterol xinofoate in human plasma. Following a simple SPE sample extraction in 96-well plate format, chromatography was performed on a Waters ACQUITY UPLC BEH C 18 column (1.7 μm, 50 min×2.1 mm) with mobile phase consisting of 100% MeOH and 0.1% NH4OH in water on a gradient program at flow rate of 0.5 mL/min. Detection of analytes and internal standards was accomplished using multiple reaction monitoring (MRM) of precursor〉product ion pairs of m/z 501.4〉313.2 (fluticasone propionate), 506.4〉293.3 (fluticasone propionate-d5), 416.4〉232.1 (salmeterol xinofoate) and 419.3〉235.2 (salmeterol-d3). The assay range was 2.50-500 pg/mL for both analytes, and a 1/x2 weighted linear regression model was used. The inter-assay accuracy and precision of the method were within ±8.6%. The recoveries from 0.30 mL of plasma were greater than 51.0% and 54.6% for fluticasone propionate and salmeterol, respectively, and the results were consistent across low, middle and high concentration levels. The method was validated following FDA, EMA and CFDA (China Food and Drug Administration)'s guidance on bioanalysis and then successfully applied to support a clinical study in healthy Chinese subjects following inhaled administration of a single combination of fluticasone propionate/salmeterol (250 μg/50 μg). 展开更多
关键词 Fluticasone propionate Salmeterol xinofoate UPLC-MS/MS Human plasma Chinese subjects
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A Thirst for Change
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作者 Ma Li 《Beijing Review》 2014年第42期38-39,共2页
Despite its location next to a desert,there is nothing barren about the prospects of Zhongwe A mere decade ago,it was a dry and desolate land,home to waves of wind-dispersed dust causing desertification and widespread... Despite its location next to a desert,there is nothing barren about the prospects of Zhongwe A mere decade ago,it was a dry and desolate land,home to waves of wind-dispersed dust causing desertification and widespread poverty.Fast-forward 10 years,Zhongwei and its tourist attraction Shapotou have suddenly become the recipient of newfound fame owing to its 展开更多
关键词 tourist suddenly recipient dispersed nothing attraction poverty desert revenue threat
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