检索结果-南通市图书馆

Chinese Physics B 2021年第5期30卷 272-276页

作者： Lei Han Fang Fang Wei-Liang Chen Kun liu shao-Yang Dai Ya-Ni Zuo and Tian-Chu Li School of Optics and Photonics Beijing Institute of TechnologyBeijing 100081China Key Laboratory of Time and Frequency Standards National Institute of Metrology(NIM)Beijing 100029China

To improve the signal to noise ratio(SNR)and the short-term stability of cesium atomic fountain clocks,the work of two-laser optical pumping is presented theoretically and *** short-term stability of the NIM6 fountain clock has been improved by preparing more cold atoms in the|F=4,m_(F)=0>clock state with a shortened cycle *** π-polarized laser beams overlapped in the horizontal plane have been applied after launching,one is resonant with|F=4>→|F′=4>transition and the other is resonant with|F=3>→|F′=4>*** optical pumping,the population accumulated in the|m_(F)=0>clock state is improved from 11%to 63%,and the detection signal is increased by a factor of 4.2,the SNR of the clock transition probability and the short-term stability are also improved accordingly.

关键词： optical pumping atomic fountain clock spin-polarization short-term stability

Relationship Between the mRNA Expression Level of TGF-β Receptor Genes in Tissues and Ovulation Rate in Hu Sheep

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Agricultural Sciences in China 2010年第11期9卷 1659-1666页

作者： LI Er-lin XIE Xin-hua XU Ye-fen XIE Zhuang CHEN Ling liu Hong-lin LI Qi-fa College of Animal Science and Technology Nanjing Agricultural University Nanjing 210095 P.R. China Breeding Sheep Farm of Hu Sheep Stock Seed Farm Suzhou 215200 P.R.China

Eight ewes of Hu sheep which bred multi-lamb were used as the high-fecundity group and the other eight ewes of Hu sheep which bred single lamb were used as the control group to investigate the relationship between the mRNA expression level of TGF-β receptor genes in tissues and ovulation rate in Hu sheep. Cloprostenol sodium was injected to make the synchronization of estrus treatment, then all ewes were slaughtered within 24-36 h after empathema and the ovaries were collected. Furthermore, the number of ovulation points was counted to determine ovulation rate for each sheep. Tissue expression analysis was conducted by RT-PCR for one ewe form the high-fecundity group and the relationship between the mRNA expression of genes encoding TGF-β receptors and ovulation rate was detected by real-time fluorescent quantitative PCR. The results showed that the relative expression level of TGF-flR I gene in the reproductive organ was significantly higher than in the lung and muscle （P 〈 0.01）, while relative expression level of TGF-βR H in reproductive organ was significantly higher than that of other tissues （P 〈 0.01）, indicating that these are highly expressed genes in the ovary. In addition, mRNA expression level of TGF-βR I and TGF-flRH in the ovaries of the high-fecundity group were significantly higher （P〈 0.01） and obviously higher （P= 0.011） than the control group, respectively. The mRNA expression level of TGF-βR I and TGF-βR H had a positive correlation with ovulation rate and the correlation coefficients were 0.562 （P〉 0.05） and 0.711 （P〈 0.05）, respectively. It is suggested that TGF-β receptors have close relationship with highfecundity in Hu sheep.

关键词： Hu sheep TGF-βR I TGF-βR H ovulation rate

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收益控制权意义下的供应链激励契约

计算机集成制造系统 2011年第2期17卷 380-388页

作者：白少布刘洪南京大学商学院江苏南京210093 南京工程学院基础部江苏南京211100

为合理分配成员间的收益,提高供应链运作绩效,针对制造商和经销商组成的供应链,建立了收益控制权意义下的委托代理激励契约模型。在不同信息属性(对称和非对称)状态下,通过该模型,提出了委托人最优激励支付和代理人最优努力投入,并以供... 详细信息

为合理分配成员间的收益,提高供应链运作绩效,针对制造商和经销商组成的供应链,建立了收益控制权意义下的委托代理激励契约模型。在不同信息属性(对称和非对称)状态下,通过该模型,提出了委托人最优激励支付和代理人最优努力投入,并以供应链期望收益效用最大化为目标,分析了委托人和代理人收益控制权范围,提出了它们之间可以达成的最优契约模式和可拥有的最优收益控制权比率。最后论证了代理人隐藏行动下的成本节约以及由此造成委托人收益损失程度,并对该模型的适用场合进行了说明。

关键词：收益控制权供应链委托代理激励机制

Numerical simulation of wind-driven circulation and pollutant transport in Taihu Lake based on a quadtree grid

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Water Science and Engineering 2019年第2期12卷 108-114页

作者： Xiao-dong liu Ling-qi Li Peng Wang Zu-lin hua Li Gu Yuan-yuan Zhou Lu-ying Chen Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes of Ministry of Education Nanjing 210098China College of Environment Hohai UniversityNanjing 210098China

In this study,a two-dimensional flow-pollutant coupled model was developed based on a quadtree *** model was established to allow the accurate simulation of wind-driven flow in a large-scale shallow lake with irregular natural boundaries when focusing on important smallscale localized flow *** quadtree grid was created by domain *** governing equations were solved using the finite volume method,and the normal fluxes of mass,momentum,and pollutants across the interface between cells were computed by means of a Godunov-type Osher *** model was employed to simulate wind-driven flow in a circular basin with non-uniform *** computed values were in agreement with analytical *** results indicate that the quadtree grid has fine local resolution and high efficiency,and is convenient for local *** is clear that the quadtree grid model is effective when applied to complex flow ***,the model was used to calculate the flow field and concentration field of Taihu Lake,demonstrating its ability to predict the flow and concentration fields in an actual water area with complex geometry.

关键词： Numerical simulation Wind-driven circulation Pollutant transport Quadtree grid Shallow-flow hydrodynamics Taihu Lake

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康德伦理学的当代价值

武汉理工大学学报（社会科学版） 2011年第6期24卷 845-851页

作者：邵华华中科技大学人文学院湖北武汉430074

康德伦理学关注于西方哲学传统中的意志自由问题,并围绕着自由与必然的辩证关系而展开探讨。自由体现于人的道德实践,从自由概念可引申出普遍的道德法则,其基本思想有助于理解当代关于普遍伦理的争论。在人学的层面上,康德伦理学弘扬以... 详细信息

康德伦理学关注于西方哲学传统中的意志自由问题,并围绕着自由与必然的辩证关系而展开探讨。自由体现于人的道德实践,从自由概念可引申出普遍的道德法则,其基本思想有助于理解当代关于普遍伦理的争论。在人学的层面上,康德伦理学弘扬以人为目的人道主义精神,揭示了人类的永恒主题———对自由的追求。这对于反思当代社会的异化状态,寻求人类的合理发展,具有重要的借鉴意义。

关键词：普遍伦理人道主义自由

Protection Effect of Exogenous Fibroblast Growth Factor 21 on the Kidney Injury in Vascular Calcification Rats

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Chinese Medical Journal 2018年第5期131卷 532-538页

作者： Yu-Chen Shi Wei-Wei Lu Yue-Long Hou Kun Fu Feng Gan Shu-Juan Cheng shao-Ping Wang Yong-Fen Qi Jing-hua liu Department of Cardiology Beijing Anzhen Hospital Capital Medical University and Beijing Institute of Heart Lung and Blood Vessel Diseases Beijing 100029 China Department of Physiology Xuzhou Medical University Xuzhou Jiangsu 221004 China Department of Pharmacology and Nutritional Sciences University of Kentucky Lexington Kentucky USA Key Laboratory of Molecular Cardiovascular Science Ministry of Education Peking University Health Science Center Beijing 100191 China Department of Cardiology Beijing Aerospace General Hospital Beijing 100076 China

Background： Chronic kidney disease （CKD） is closely related to the cardiovascular events in vascular calcification （VC）. However, little has known about the characteristics of kidney injury caused by VC. Fibroblast growth factor 21 （FGF21 ） is an endocrine thctor, which takes part in various metabolic actions with the potential to alleviate metabolic disorder diseases, Even FGF21 has been regarded as a biomarker in CKD, the role of FGF21 in CKD remains unclear. Therefore, in this study, we evaluate the FGF21 on the kidney injury in VC rats. Methods： The male Sprague-Dawley rats were divided into three groups：（ 1 ） control group, （2） Vitamin D3 plus nicotine （VDN）-induced VC group, （3） FGF21-treated VDN group. After 4 weeks, the rats were killed and the blood was collected for serum creatinine, urea nitrogen, calcium, and phosphate measurement. Moreover, the renal tissues were homogenized for alkaline phosphatases （ALPs） activity and calcium content. The levels of FGF21 protein were measured by radioimmunoassay. The levels of β-Klotho and FGF receptor 1 （FGFR1） protein were measured by enzyme-linked immunosorbent assay （EL1SA）. The structural damage and calcifications in aortas were stained by Alizarin-red S. Moreover, the structure of kidney was observed by hematoxylin and eosin staining. Results： The renal lhnction impairment caused by VDN modeling was ameliorated by FGF21 treatment, inhibited the elevated serum creatinine and urea level by 20.5% （34.750 ± 4.334 pmol/L vs. 27.630± 2.387pamol/L） and 4.0% （7.038 ± 0.590 mmol/L vs. 6.763 ±0.374 mmol/L; P 〈 0.01 ）, respectively, together with the structural damages of glomerular atrophy and renal interstitial fibrosis. FGF21 treatment downregulated the ALP activity, calcium content in the kidney of VC rats by 42.1% （P 〈 0.01 ） and 11.7% （P 〈 0.05） as well as ameliorated the aortic injury and calcification as compared with VDN treatment alone group, indicating an ameliorative effect on VC. EL1SA assays showed that the

关键词： Chronic Fibroblast Growth Factor 21 Renal Insufficiency Vascular Calcification β-Klotho

Analysis of corneal morphologic and pathologic changes in early-stage congenital aniridic keratopathy

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International Journal of Ophthalmology(English edition) 2017年第3期10卷 378-384页

作者： Juan Du Rong-Qiang liu Lei Ye Zhi-Hui Li Feng-Tu Zhao Nan Jiang Lin-Hong Ye Yi shao Department of Ophthalmology the First People's Hospital of ShundeNanfang Medical UniversityFoshan 528300Guangdong ProvinceChina Department of ophthalmology the First Affiliated Hospital of Nanchang UniversityJiangxi Province Clinical Ophthal-mology InstituteNanchang 330006Jiangxi ProvinceChina Postgraduate College the Third hospital Affiliated of Sun Yat-sen UniversityGuangzhou 510000Guangdong ProvinceChina

AIM：To determine typical corneal changes of congenital aniridic keratopathy（CAK）using corneal topography and confocal systems,and to identify characteristics that might assist in early ***：Patients with CAK and healthy control subjects underwent detailed ophthalmic examinations including axial length,corneal thickness,tear film condition,corneal topography,and laser-scanning in vivo confocal microscopy（IVCM）. RESULTS：In early stage aniridic keratopathy,Schirmer I test（SIT）,break-up time（BUT）,mean keratometry（mean K）and simulated keratometry（sim K）were reduced relative to controls（P〈0.05）,while simulation of corneal astigmatism（sim A）and corneal thickness were increased（P〈0.05）. In addition,significantly more eyes exhibited flat cornea compared with the control group. Inflammatory dendritic cells were present in the aniridic epithelium,with significantly increased density relative to controls（P〈0.05）. Palisade ridge-like features and abnormal cell morphology were observed in six out of sixteen CAK cases. In central cornea area,the aniridic corneas had the increased subbasal nerve density. CONCLUSION：These changes in corneal morphology in borderline situations can be useful to confirm the diagnosis of CAK.

关键词： aniridic keratopathy corneal topography confocal microscopy

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电动振动台空台建模与仿真技术研究

系统仿真学报 2006年第2期18卷 313-315页

作者：范宣华胡绍全中国工程物理研究院结构力学研究所绵阳621900

对某电动振动台空台进行了有限元建模,介绍了建模方法。通过空台的模态试验结果对空台模型进行了修正,分析了各阶模态振型。修正结果表明,空台的有限元模型能够反映其真实的动态特性,可用于振动试验仿真。最后,给出了正弦扫描试验仿真... 详细信息

对某电动振动台空台进行了有限元建模,介绍了建模方法。通过空台的模态试验结果对空台模型进行了修正,分析了各阶模态振型。修正结果表明,空台的有限元模型能够反映其真实的动态特性,可用于振动试验仿真。最后,给出了正弦扫描试验仿真的算法并实现了振动台正弦扫描试验仿真。

关键词：电动振动台建模模态试验试验仿真

Natural populations of lactic acid bacteria in douchi from Yunnan Province,China

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2012年第4期13卷 298-306页

作者： Chen-jian liu Fu-ming GONG Xiao-ran LI Hai-yan LI Zhong-hua ZHANG Yue FENG Hiroko NAGANO State Key Laboratory of Food Science and Technology Jiangnan UniversityWuxi 214122China Laboratory ofApphed Mierobtology Faculty ofLife Scwnee and TechnologyKunmmg Umversity of Sctence and TechnologyKunming 650500Chin Basic Department Dehong Vocational CollegeMangshi 678499China Faculty of Education Gifu UniversityGifu 501-1193Japan

This research was aimed at isolating and identifying the predominant lactic acid bacteria(LAB) in the traditional Chinese salt-fermented soybean food,douchi,from Yunnan,*** predominant LAB present were isolated and identified by conventional culture-dependent methods combined with molecular biological *** hundred and sixty isolates were obtained from thirty kinds of traditional fermented douchi from six cities and counties in Yunnan,and those strains were divided into twelve groups by their morphological and biochemical *** on 16S ribosomal DNA(rDNA) sequencing and analysis,56 representative strains were identified as belonging to 6 genera and 14 species:Lactobacillus(4 spp.),Weissella(3 spp.),Pediococcus(2 spp.),Staphylococcus(2 spp.),Enterococcus(1 sp.),and Bacillus(2 spp.).The results show that douchi contains a large natural population of LAB of diverse composition from which some strains could be selected as starters for functional fermented *** is the first study on the original douchi from Yunnan,and the results suggest that it may be a useful source for the isolation of *** study has also laid a foundation for further research on developing functional douchi products.

关键词： Fermented food Douchi Lactic acid bacteria Culture-dependent methods 16S rDNA

STUDIES ON THE REACTION OF ORGANOTELLURONIUM SALTS

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Chinese Chemical Letters 1991年第1期2卷 51-54页

作者： Qi ZHONG Yu Long CHEHG Jian Guo shao Chang Qing liu Chemistry Department Yangzhou Teachers CollegeYangzhou225002

The structural studies of the telluronium saltrformation between dibutyl telluride and secondary (?)-bromo compounds and the use of the obtai- ned salts for the olefination of carbonyl compounds were reported.

关键词： CHC CN OH CIC STUDIES ON THE REACTION OF ORGANOTELLURONIUM SALTS OCH