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专家系统

世界科学 1987年第2期 35-38页

作者： peterj.Denning 邱勇刚美国国家航天局Ames研究中心高级计算机科学研究所所长。

人类的创造力是和对逻辑惊人的尊敬联系在一起的,逻辑地(理性地)阐明理由的能力和智能密切相关,这在柏拉图的著作中讲得很清楚。数理逻辑是一门证明用一些抽象符号书写的语句正确性的方法的学科,对人类智能的研究又导致了数理逻辑的发... 详细信息

人类的创造力是和对逻辑惊人的尊敬联系在一起的,逻辑地(理性地)阐明理由的能力和智能密切相关,这在柏拉图的著作中讲得很清楚。数理逻辑是一门证明用一些抽象符号书写的语句正确性的方法的学科,对人类智能的研究又导致了数理逻辑的发展。在十九世纪,主要是想找一个通用的逻辑系统,使得它能证明在其他任何系统中可以证明的问题。

关键词：数据库数据库系统专家系统计算机程序

Studies on gene structure, enzymatic activity and regulatory mechanism of acetohydroxy acid isomeroreductase from G2 pea

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Science China(Life Sciences) 2003年第4期46卷 389-398页

作者：徐云剑顾雪松李珺李晴 peterj.Davies 朱玉贤 The National Laboratory of Protein Engineering and Plant Genetic Engineering Peking University Department of Plant Biology Cornell University Ithaca

The AAIR genomic DNA of G2 pea (Pisum sativum L.) was amplified by PCR method. Sequence analysis showed that it was composed of 8 introns and 9 exons with three of the introns containing specific A/T-rich endogenous promoter regions. Molecular hybridization experiments revealed that the expression of AAIR remained at a high level before and after flowering if grown in short day growth chambers. However, when grown under long day conditions, the level of AAIR expression declined very rapidly after flowering. This variation of AAIR expression is consistent with the change of enzymatic activity of acetohydroxy acid isomeroreductase. Functional complementation experiments carried out using an acetohydroxy acid isomeroreductase deficient E. coli strain showed that these cells could not grow on M9 medium without addition of branched-chain amino acids unless they were transformed with the AAIR expression vector. Further study revealed that overexpression of the pea AAIR cDNA in acetohydroxy acid isomeroreductase deficient E. coli strain enhanced significantly its branched-chain amino acid biosynthetic capacity. Results from gel shift experiments showed that fractions of pea nuclear protein extracts could bind specifically to some A/T rich regions present in introns of the AAIR gene. The A/T-rich-region-binding proteins remained at a steady level in the non-senescing apical buds of short-day grown G2 pea. In the rapid-senescing apical buds of long-day grown G2 pea, the levels of these proteins declined rapidly after flower initiation. Therefore, the nuclear protein binding capacities to endogenous promoter regions may constitute an important mechanism to regulate AAIR gene expression.

关键词： AAIR G2 pea A/T rich region enzymatic activity senescence. D

Hydroxysafflor yellow A protects against thioacetamide-induced liver fibrosis in rats via suppressing proinflammatory/fibrogenic mediators and promoting hepatic stellate cell senescence and apoptosis

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Asian Pacific Journal of Tropical Biomedicine 2023年第8期13卷 348-358页

作者： Sayed H.Seif el-Din Olfat A.Hammam Shahira M.Ezzat Samira Saleh Marwa M.safar Walaa H.El-Maadawy Naglaa M.El-Lakkany Pharmacology Department Theodor Bilharz Research InstituteWarak El-HadarImbaba P.O.Box 30Giza 12411Egypt Pathology Department Theodor Bilharz Research InstituteWarak El-HadarImbaba P.O.Box 30Giza 12411Egypt Pharmacognosy Department Faculty of PharmacyCairo UniversityCairo 11562Egypt Pharmacognosy Department Faculty of PharmacyOctober University for Modern Sciences and ArtsGizaEgypt Pharmacology and Toxicology Department Faculty of PharmacyCairo UniversityCairo 11562Egypt Pharmacology and Biochemistry Department Faculty of PharmacyThe British University in EgyptCairoEgypt

Objective:To evaluate the effect of hydroxysafflor yellow A(HSYA)on thioacetamide-induced liver ***:Thioacetamide was administered to rats intraperitoneally in doses of 200 mg/kg twice a week for 12 ***-intoxicated rats were given silymarin(50 mg/kg)or HSYA(5 mg/kg)orally every day for 8 *** enzymes,fibrosis markers,histological changes as well as immunohistochemistry of TNF-α,IL-6,p21,α-SMA,and caspase-3 were *** effect of HSYA on HSC-T6 activation/proliferation and apoptosis was also determined in ***:HSYA decreased liver enzymes,TNF-α,IL-6,and p21 expressions,hepatic PDGF-B,TIMP-1,TGF-β1,and hydroxyproline levels,as well as fibrosis score(S2 vs.S4)compared to the thioacetamide *** also downregulatedα-SMA while increasing caspase-3 ***,at 500μg/mL,HSYA had only a slightly suppressive effect on HSC proliferation,with a 9.5%***,it significantly reduced TGF-β1,inhibitedα-SMA expression,induced caspase-3 expression,and promoted cell ***:HSYA may be a potential therapeutic agent for delaying and reversing the progression of liver *** research on HSYA at higher doses and for a longer period is warranted.

关键词： Hydroxysafflor yellow A Thioacetamide Hepatic stellate cells Inflammatory markers Liver fibrosis p21 α-SMA Apoptosis

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两半球的相互作用

气象科技 1986年第1期 34-44页

作者： peterj.Webster 董敏澳大利亚联邦科学和工业研究组织大气研究部

一、引言一个半球的大气环流能在多大程度上影响另一半球的环流,这一问题在很长时间里都是一个相当有争论的题目。传统的看法认为季节性振动的热赤道对应两半球温带区域之间是一个屏障。在这个意义上,每个半球中的环流是相互独立地被驱... 详细信息

一、引言一个半球的大气环流能在多大程度上影响另一半球的环流,这一问题在很长时间里都是一个相当有争论的题目。传统的看法认为季节性振动的热赤道对应两半球温带区域之间是一个屏障。在这个意义上,每个半球中的环流是相互独立地被驱动的,它们以各自的方式对特定的加热梯度及地理结构作出反

关键词：东风带开尔文波大气环流频散对流层西风带潮波行星环流大气现象波谱分析对流圈低层大气扰动动能半球罗斯贝波行星波

Beach Handball and Beach Volleyball as Means Leading to Increasing Physical Activity of Recreational SportspeoplemPilot Study

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Journal of Sports Science 2015年第4期3卷 165-170页

作者： Jan Belka Karel Hulka Michal safar Radim Weisser Julie Chadimova Department of Sport Faculty of Physical Culture Palacky University Olomouc 77900 Czech Republic Department of Natural Sciences in Kinanthropology Faculty of Physical Culture Palacky University Olomouc 77900 Czech Republic

The sample consisted of sixteen man of aged average 24.5 year, average height 181.9 cm and weight 80.4 kg. The average of static pulse rate was 56.4 beats min1. The average heart rate max was 189.7 ± 7.8 beats minl. For the calculation of HRmax （maximal heart rate）, a mathematical figure HRmax = 207 - （0.7 × age） was used. Probands have participated on the same day on a tournament in beach and handball tournament. HR （heart rate） was monitored via Sport Tester Polar. The results were evaluated by Polar software. The data was statistically compiled with the use of arithmetic average and standard deviation. The players played three matches in beach volleyball on one set to 21 points （necessary difference of 2 points）. One set lasted approximate 13.5 min. After a break, they went to play three matches in beach handball. The average HR during beach volleyball was 149.5 ±14.1 beats min-1 and 164.3 ± 14.5 beats min1 in beach handball. In beach volleyball, we also focused on players＇ intensity load differences 172 ±14.1 beats minland goalkeepers 156.5 ± 16.6 beats min1. In the beach volleyball, players spend most of their playing time on the playing area in the zone intensity load 80%-90% HRmax （36% playing time）. In the beach handball, players spend most of their playing time on the playing area in the zone intensity load 90%-100% HRmax （39% playing time）.

关键词： Sport games heart rate physical activity health.

如果海平面维持在陆架边缘之上深切谷将怎样和任何处形成?

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海洋地质动态 1998年第10期14卷 12-14页

作者： peterj.Talling 龚建明

我们收集了许多有关前陆盆地和被动大陆边缘盆地的地形资料，它们都具有相对宽阔的大陆架（４０～２００ｋｍ）。其中每个盆地在地形上都具有两个向外凸出的部分，最明显的凸出部分出现在目前水源９０～１３０ｋｍ的大陆架边缘，而第二... 详细信息

我们收集了许多有关前陆盆地和被动大陆边缘盆地的地形资料，它们都具有相对宽阔的大陆架（４０～２００ｋｍ）。其中每个盆地在地形上都具有两个向外凸出的部分，最明显的凸出部分出现在目前水源９０～１３０ｋｍ的大陆架边缘，而第二个凸出部分也出现在目前高水位滨线位...

关键词：海平面陆架边缘深切谷前陆盆地海洋地质

The Precautions Efficacy Taken among Health Care Workers While Performing Tracheostomies on COVID-19 Patients: Systematic Review

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International Journal of Otolaryngology and Head & Neck Surgery 2022年第6期11卷 283-291页

作者： Mohaned Al safar Hosam A. Amoodi Mohammed Al-Satti Abulaziz Alsaidi East Jeddah General Hospital Jeddah Saudi Arabia University of Jeddah Jeddah Saudi Arabia Dr. Soliman Fakeeh Hospital Jeddah Saudi Arabia King Abdulaziz Medical City Jeddah Saudi Arabia International Medical Center Jeddah Saudi Arabia

Background & objectives: Coronavirus disease 19 (COVID-19) has been declared by World Health Organization as a global pandemic disease in March 2020. Acute respiratory distress syndrome is frequent complication of COVID-19 disease. Tracheostomy is needed in cases of prolonged mechanical ventilation (7 - 10 days) in patients with acute respiratory distress syndrome. Tracheostomies are highly aerosol generating procedures, Otorhinolaryngologists and Health Care Workers (HCWs) are at high risk of virus exposure. The aim of this review is to evaluate the risk of transmission of COVID-19 during tracheostomy procedure, and to review the practical recommendation and scope of the timing to reduce risk of transmission to HCW. Methods: PubMed database was searched between April 2020 to Jan 2021 using the terms “Tracheostomy AND COVID-19 AND Health Care Workers”. All the articles that shared the same aim were screened which resulted in 243 references without duplicates. The title and abstract screening excluded further 202 studies. Eventually 9 full-text studies were included. Results: Five hundred and two COVID-19 patients underwent tracheostomies during the study period. Sixty-three percent of the procedure were done through open technique, while 37% of them were done through percutaneous technique. Seventy-eight percent of them used full Personal Protective Equipment (PPE) and 44.4% used Powered Air Purifying Respirator (PAPR). Negative Pressure Rooms (NPR) were used in 67%. Conclusion: The studies showed similar negative results on HCW infection despite much variance in using PPE. However, there should be global unified recommendations and guidelines regarding tracheostomies in COVID-19 patients to prevent future HCW infection.

关键词： Tracheostomy COVID-19 Health Care Workers

文化的相似性是否产生误导?——澳大利亚厂商在英国的经历

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经济资料译丛 2004年第3期 83-90页

作者： MarilynFenwick RonEdwardw peterj.Buckley 赵亮厦门大学经济学院国贸系 361005

正在国际化的公司往往都是通过进入与它们自己国家相似的市场来开始这一进程的,有人用此策略来解释为何澳大利亚企业将它们众多的对外直接投资集中投在英国。《国际商业评论》此前刊登过一篇探讨澳大利亚在英国投资的文章,本文在此基础... 详细信息

正在国际化的公司往往都是通过进入与它们自己国家相似的市场来开始这一进程的,有人用此策略来解释为何澳大利亚企业将它们众多的对外直接投资集中投在英国。《国际商业评论》此前刊登过一篇探讨澳大利亚在英国投资的文章,本文在此基础上进一步地研究了与澳大利亚和英国管理方式之间、未曾料到的差异有关的一些问题。本文研究了这些问题在已知的两国文化差异很小而实际差异更大的情况下对人际关系的影响,而且还考虑了有关国际管理的一些问题。

关键词：文化相似性澳大利亚企业英国文化差异人际关系员工

果树产量和果实矿物质含量对‘Hass’油梨果实品质的影响

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国外作物育种 2003年第3期22卷 47-48页

作者： peterj.Hofman 向平