检索结果-南通市图书馆

Nathaniel Gist Gee＇s contribution to biology n modern China

在线全文

学校读者我要写书评

暂无评论

Protein & Cell 2017年第4期8卷 237-239页

作者： lei fu Zhejiang Normal University Jinhua 321004 China

Nathaniel Gist Gee （祁天锡, 1876-1937） was an American biologist who lived in China for several decades. He greatly contributed to the development of biology in modern China, including the establishment of the first...

关键词：

Chia-Chen Tan and genetics in modern China

在线全文

学校读者我要写书评

暂无评论

Protein & Cell 2019年第5期10卷 313-314页

作者： lei fu Zhejiang Normal University Jinhua 321004China

Chia-Chen Tan(谈家桢,1909-2008)was one of the most important founders of genetics in modern China and made great effort to the inter nation alization of Chinese gen etics(Fig.1).Chia-Chen Tan was born on September 15,1909 in Zhejiang *** studied in missionary middle school and public high school successively before being admitted to Soochow Un iversity without exami *** majored in biology in university and became interested in *** graduating in 1930,he entered YenChing University and learnt from Ju-Chi Li(李汝祺)(Fig.2)who was the first Chinese student to receive a doctor's degree from American famous geneticist Thomas Hunt Morgan and was the only genetics professor in YenChing University at that time(Zhang,2017).

关键词： Chia-Chen Tan genetics modern

Shisan C. Chen and his research on goldfis genetics

在线全文

学校读者我要写书评

暂无评论

Protein & Cell 2016年第2期7卷 79-80页

作者： lei fu Zhejiang Normal University Jinhua 321004 China

Shisan C. Chen （1894-1957） was an excellent geneticist （Fig. 1）, who made outstanding contributions to research into the variation, evolution and heredity of goldfish and published many of his findings in scientific and educational journals. Shisan C. Chen＇s research into goldfish remains highly regarded by the international scientific community and resulted in the illumination of this research field to scientists and the general public alike.

关键词： geneticist illumination public

Two-dimensional Metal-Organic Frameworks as Electrocatalysts for Oxygen Evolution Reaction

在线全文

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2020年第4期36卷 504-510页

作者： lei Jia ZENG Mengqi fu lei College of Chemistry and Molecular Sciences Wuhan UniversityWuhan 430072P.R.China

Oxygen evolution reaction(OER)plays an important role in many electrochemical ***,its sluggish kinetics severely limits the development of next-generation energy ***,two-dimensional(2D)metal-organic frameworks(MOFs)have attracted much attention as a class of promising *** diverse components and tunable structures provide a new platform to design and explore ideal *** ultrathin characteristics including high specific surface area,abundant exposed metal sites and fast electronic transfer further promote the electrocatalytic performance of 2D ***,many attempts have been made in svntliesizing 2D MOF-based electrocatalysts in recent *** review focuses on the strategies to fabricate 2D MOFs with high electrocatalytic performances for *** discussion on challenge and development of their electrocatalytic application is also presented.

关键词： Two-dimensional Metal-organic framework Oxygen evolution reaction(OER) Electrocatalysis

New designing for nanostructured 2D materials and 2D superlattices

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China Materials 2018年第5期61卷 761-762页

作者： Yao Xiao lei fu The Institute for Advanced Studies (IAS) Wuhan University Wuhan 430072 China College of Chemistry and Molecular Sciences Wuhan University Wuhan 430072 China

As the most remarkable candidate for the next-generationelectronics, two-dimensional （2D） materials have at-tracted much interest. Recently in a letter in NatureMaterials, Professor David A. Muller and Lain-Jong Liand their cooperators reported the direct synthesis ofone-dimensional （1D） MoS2 channels embedded in 2DWSe2 monolayers through a dislocation-catalyzed strategy[1].

关键词：中国科学材料科学

A Tauberian theorem for l-adic sheaves on A^1

在线全文

学校读者我要写书评

暂无评论

Science China Mathematics 2010年第9期53卷 2207-2214页

作者： fu lei Nankai Univ Chern Inst Math Tianjin 300071 Peoples R China Nankai Univ LPMC Tianjin 300071 Peoples R China

Let K ∈ L1(R) and let f ∈ L∞(R) be two functions on *** convolution(Kf)(x) =∫R K(x-y)f(y)dy can be considered as an average of f with weight defined by ***'s Tauberian theorem says that under suitable conditions,if lim x→∞(K f)(x) = lim x→∞(K A)(x) for some constant A,then lim x→∞ f(x) = *** prove the following-adic analogue of this theorem:Suppose K,F,G are perverse-adic sheaves on the affine line A over an algebraically closed field of characteristic p(p=l).Under suitable conditions,if(K F)|η∞≌(K G)|η∞,then F|η∞≌ G|η∞,where η∞ is the spectrum of the local field of A at ∞.

关键词： Tauberian theorem l-adic Fourier transformation local Fourier transformation

Measurement of ice flow velocities from GPS positions logged by short-period seismographs in East Antarctica

在线全文

学校读者我要写书评

暂无评论

Science China Earth Sciences 2021年第8期64卷 1381-1389页

作者： lei fu Jingxue GUO Xiaofei CHEN Shenzhen Key Laboratory of Deep Offshore Oil and Gas Exploration Technology Southern University of Science and TechnologyShenzhen 518055China Department of Earth and Space Sciences Southern University of Science and TechnologyShenzhen 518055China Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou) Guangzhou 511458China Key Laboratory for Polar Science MNRPolar Research Institute of ChinaShanghai 200136China

The ice flow velocity is a basic feature of glaciers and ice sheets. Measuring ice flow velocities is very important for estimating the mass balance of ice sheets in the Arctic and Antarctic. Traditional methods for measuring ice flow velocity include the use of stakes, snow pits and on-site geodetic GPS and remote sensing measurement methods. Geodetic GPS measurements have high accuracy, but geodetic GPS monitoring points only sparsely cover the Antarctic ice sheets. Moreover, the resolution and accuracy of ice flow velocities based on remote sensing measurements are low. Although the accuracy of the location data recorded by the navigation-grade GPS receivers embedded in short-period seismographs is not as good as that of geodetic GPS,the ice flow velocity can be accurately measured by these navigation-grade GPS data collected over a sufficiently long period. In this paper, navigation-grade GPS location data obtained by passive seismic observations during the 36 th Chinese National Antarctic Research Expedition were used to accurately track the movement characteristics of the ice sheet in the Larsemann Hills of East Antarctica and the Taishan Station area. The results showed that the ice sheet in the two study areas is basically moving northwestward with an average ice flow velocity of approximately 1 m mon-1. The results in the Taishan Station area are basically consistent with the geodetic GPS results, indicating that it is feasible to use the embedded GPS location data from shortperiod seismographs to track the movement characteristics of ice sheets. The ice flow characteristics in the Larsemann Hills are more complex. The measured ice flow velocities in the Larsemann Hills with a resolution of 200 m help to understand its characteristics. In summary, the ice flow velocities derived from GPS location data are of great significance for studying ice sheet dynamics and glacier mass balance and for evaluating the systematic errors caused by ice sheet movements in s

关键词： Short-period seismograph Antarctic ice sheet Ice flow velocity GPS

A Gradient Descent Method for Estimating the Markov Chain Choice Model

在线全文

学校读者我要写书评

暂无评论

Journal of the Operations Research Society of China 2023年第2期11卷 371-381页

作者： lei fu Dong-Dong Ge School of Information Management and Engineering Shanghai University of Finance and EconomicsShanghai 200433China

In this paper,we propose a gradient descent method to estimate the parameters in a Markov chain choice ***,we derive closed-form formula for the gradient of the log-likelihood function and show the convergence of the *** experiments verify the efficiency of our approach by comparing with the expectation-maximization *** show that the similar result can be extended to a more general case that one does not have observation of the no-purchase data.

关键词： Markov chain choice model Parameter estimation Gradient descent method

A modified Kozeny-Carman equation for predicting saturated hydraulic conductivity of compacted bentonite in confined condition

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Rock Mechanics and Geotechnical Engineering 2022年第3期14卷 984-993页

作者： Kunlin Ruan Xian-lei fu Department of Civil and Environmental Engineering Waseda UniversityTokyo169-8555Japan Jiangsu Key Laboratory of Urban Underground Engineering and Environmental Safety Institute of Geotechnical EngineeringSoutheast UniversityNanjing210096China

Kozeny-Carman(KC) equation is a well-known relation between hydraulic conductivity and pore properties in porous material. The applications of KC equation to predicting saturated hydraulic conductivities of sands and non-expansive soils are well documented. However, KC equation is incapable of predicting saturated hydraulic conductivity of expansive soil(e.g. bentonite) well. Based on a new dualpore system, this study modified KC equation for improving the prediction of saturated hydraulic conductivities of bentonites. In this study, an assumption that inter-layer space(micropore) has limited effect on fluid flow performance of compacted bentonite was adopted. The critical parameters including total porosity and total tortuosity in conventional KC equation were replaced by macroporosity and tortuosity of macropore, respectively. Macroporosity and microporosity were calculated by basal spacing of compacted bentonite, which was estimated by assuming that specific surface area is changeable during saturation process. A comprehensive comparison of bentonite’s saturated hydraulic conductivity predictions, including modified KC equation proposed in this study, conventional KC equation, and prediction method based on diffuse double layer(DDL) theory, was carried out. It was found that the predicted saturated hydraulic conductivity of bentonites calculated using modified KC equation fitted the experimental data better than others to a certain extent.

关键词： Kozenyecarman(KC)equation Saturated hydraulic conductivity Bentonite Pore size distribution(PSD) Specific surface area