Scholarly Research Exchange最新文献_第7页

Advances in the Measurement of the Lense-Thirring Effect with Planetary Motions in the Field of the Sun 太阳场中行星运动透镜效应测量的研究进展

Scholarly Research Exchange Pub Date : 2008-07-02 DOI: 10.3814/2008/105235

L. Iorio

{"title":"Advances in the Measurement of the Lense-Thirring Effect with Planetary Motions in the Field of the Sun","authors":"L. Iorio","doi":"10.3814/2008/105235","DOIUrl":"https://doi.org/10.3814/2008/105235","url":null,"abstract":"By processing more than 400 000 planetary observations of various types \u0000with the dynamical models of the EPM2006 ephemerides, E.V. Pitjeva recently \u0000estimated a correction to the canonical Newtonian-Einsteinian Venus' perihelion \u0000precession of − 0.0004 ± 0.0001 arcseconds per century. The prediction of general \u0000relativity for the Lense-Thirring precession of the perihelion of Venus is − 0.0003 arcseconds per century. It turns out that neither other mismodelled/unmodelled \u0000standard Newtonian/Einsteinian effects nor exotic ones, postulated to, for example, \u0000explain the Pioneer anomaly, may have caused the estimated extra-precession \u0000of the Venus orbit which, thus, can be reasonably attributed to the \u0000gravitomagnetic field of the Sun, not modelled in the routines of the EPM2006 \u0000ephemerides. However, it must be noted that the quoted error is the formal, \u0000statistical one; the realistic uncertainty might be larger. Future improvements of \u0000the inner planets' ephemerides, with the inclusion of the Messenger and Venus-Express tracking data, should further improve the accuracy and the consistency \u0000of such a test of general relativity which would also benefit from the independent \u0000estimation of the extra-precessions of the perihelia (and the nodes) by other teams \u0000of astronomers.","PeriodicalId":169134,"journal":{"name":"Scholarly Research Exchange","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128371436","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 10

Formulas for the Amplitude of the van der Pol Limit Cycle through the Homotopy Analysis Method 用同伦分析方法得到van der Pol极限环的振幅公式

Scholarly Research Exchange Pub Date : 2008-06-10 DOI: 10.3814/2009/854060

J. López, S. Abbasbandy, R. López-Ruiz

引用次数: 17

Are Hofmeister Series Relevant to Modern Ion-Specific Effects Research? 霍夫迈斯特系列与现代离子特异性效应研究相关吗?

Scholarly Research Exchange Pub Date : 2008-05-14 DOI: 10.3814/2008/818461

T. Evens, R. Niedz

引用次数: 23

Sequence and Phylogenetic Analysis of Three Isolates of Avian Influenza H9N2 from Chickens in Southern China 中国南方3株鸡源H9N2禽流感分离株序列与系统发育分析

Scholarly Research Exchange Pub Date : 2008-04-14 DOI: 10.3814/2008/802317

Zhixun Xie, Jianbao Dong, Xiaofei Tang, Liu Jiabo, Mazhar I. Khan, Y. Pang, Xianwen Deng, Zhiqin Xie

{"title":"Sequence and Phylogenetic Analysis of Three Isolates of Avian Influenza H9N2 from Chickens in Southern China","authors":"Zhixun Xie, Jianbao Dong, Xiaofei Tang, Liu Jiabo, Mazhar I. Khan, Y. Pang, Xianwen Deng, Zhiqin Xie","doi":"10.3814/2008/802317","DOIUrl":"https://doi.org/10.3814/2008/802317","url":null,"abstract":"Three isolates of H9N2 subtype of influenza virus have been isolated from chickens in Guangxi province. In this study, eight full-length genes of each of the H9N2 isolates, A/Chicken/Guangxi/1/00, A/Chicken/Guangxi/14/00, and A/Chicken/Guangxi/17/00, were obtained. Sequence analysis and phylogenetic studies were conducted by comparing eight genes of each isolate with those of the available H9N2 strains at GenBank. Results showed a high degree of homology between the Guangxi isolates and isolates from Guangdong and Jiangsu provinces, suggesting that Guangxi isolates originated from the same source. However, the eight genes of these three isolates from Guangxi were not in the same sublineages in the phylogenic trees, which suggest that they were products of natural reassortment between H9N2 avian influenza viruses from different sublineages. The 9 nucleotides ACAGAGATA encoding amino acids T, E, I were absent between nucleotide 205 and 214 in the open reading frame of NA genes in the Guangxi isolates. AIV strains that infect human have in their HA proteins, Leucine at position 226. The analysis of deduced amino acid sequence of HA proteins of C/GX/1/00, C/GX/14/00, and C/GX/17/00 showed that the position 226 of these isolates was glycine instead of leucine, suggesting that these three isolates differ from H9N2 AIV strains isolated from human infections.","PeriodicalId":169134,"journal":{"name":"Scholarly Research Exchange","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129494606","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 8

Solar System Tests of Some Models of Modified Gravity Proposed to Explain Galactic Rotation Curves without Dark Matter 一些修正引力模型的太阳系测试，以解释没有暗物质的星系旋转曲线

Scholarly Research Exchange Pub Date : 2007-11-02 DOI: 10.3814/2008/968393

L. Iorio, M. Ruggiero

引用次数: 18

Coronary-Subclavian Steal Syndrome: A Rare Cause of Angina Pectoris 冠状动脉-锁骨下窃血综合征:心绞痛的一种罕见病因

Scholarly Research Exchange Pub Date : 1900-01-01 DOI: 10.3814/2008/541085

D. Papadopoulos, V. Votteas

引用次数: 0

Morbid Parasitological and Histopathological Events in Hamsters Infected with Intestinal Amoebiasis Given Artesunate 注射青蒿琥酯后感染肠阿米巴病的仓鼠的病态寄生虫学和组织病理学事件

Scholarly Research Exchange Pub Date : 1900-01-01 DOI: 10.3814/2008/327318

S. Mahmoud, N. Nessim

{"title":"Morbid Parasitological and Histopathological Events in Hamsters Infected with Intestinal Amoebiasis Given Artesunate","authors":"S. Mahmoud, N. Nessim","doi":"10.3814/2008/327318","DOIUrl":"https://doi.org/10.3814/2008/327318","url":null,"abstract":"Objectives. This work is a trial to elucidate the parasitological and histopathological sequelae of giving the antimalarial drug (artesunate) in experimental intestinal amoebiasis. Methods. A group of 24 hamsters was infected by Entamoeba histolytica cysts orally using a canula. This group was subdivided into two main subgroups. Subgroup I: given 6000 E. histolytica cysts orally by a canula, then sacrificed five weeks postinfection. Subgroup II : given the same infective dose, then two weeks later, treated with artesunate 10 mgm/Kg b. wt/hamster over 3 consecutive days. Again sacrifice was performed five weeks postinfection. Multiple stool examinations, and histopathological examination of the caecal end of the large intestine were resorted to, in order to assess the antiamoebic effect of the drug. Faecal smear examination revealed absolute disappearance of E. histolytica cysts in the treated group. Again, histopathology of the mucosal scrapings of the caecum showed complete absence of Entamoeba histolytica trophozoites in the treated group, when compared to the control animals (P<.001). This study may be beneficial, especially in areas endemic with amoebiasis to help overcoming the emerging resistance to the usually available antiamoebic drugs.","PeriodicalId":169134,"journal":{"name":"Scholarly Research Exchange","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132523877","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3