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Revisiting the Epoch of Cosmic Acceleration

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Research in Astronomy and Astrophysics 2023年第9期23卷 1-11页

作者： david Dahiya Deepak Jain Technische Universität Dresden D-01069 DresdenGermany Deen Dayal Upadhyaya College University of DelhiDwarkaNew DelhiIndia

We revisit the epoch of cosmic speed-up characterized by the redshift of transition from a decelerated to an accelerated *** redshift is termed the transition redshift(z_(t)).We use the spatially flat and non-flat variants of the most commonΛCDM and XCDM models to put constraints on the transition redshift along with the other model *** data for this analysis come from the recent and updated Pantheon+supernova(SN)data set and the Hubble parameter measurements obtained from Cosmic *** consider both data sets with their respective covariance matrices incorporating all statistical and systematic *** observe that using the combined data sets of H(z)and SNe,the best fit value of transition redshift lies in the range 0.61

关键词： (cosmology )dark energy-(cosmology )cosmological parameters-cosmology observations

Increasing our return on investment in science:Start with better behavior

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Journal of Sport and Health Science 2023年第3期12卷 281-283页

作者： david Moher Centre for Journalology Clinical Epidemiology programOttawa Hospital Research InstituteOttawaON K1H 8L6Canada School of Epidemiology and Public HealthUniversity of OttawaOttawaON K1H 8L6Canada

In August of 2022,I gave the opening keynote address at the 5th North American Congress on Biomechanics,in Ottawa,*** topic of my talk was about whether the research ecosystem was getting a reasonable return on its in... 详细信息

关键词： return Canada investment

New case of HIV cure:joined forces of haploidentical stem cells and HLA-mismatched cord blood

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Signal Transduction and Targeted Therapy 2023年第7期8卷 3198-3199页

作者： david Peterhoff Institute for Clinical Microbiology and Hygiene University Hospital RegensburgRegensburgGermany

Recently,Hsu et *** the remission and possible cure of HIV-1 infection in the context of an allogeneic hematopoietic stem cell transplant for the treatment of acute myeloid leukemia(AML).1 This is the fourth case of a potential cure for HIV infection ever,the first in a woman,the first in a person of mixed race,and the first in which a CCR5Δ32/Δ32 haplo-cord transplant was used.

关键词： al. infection acute

The role of the general practitioner in men's health

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Asian Journal of Andrology 2020年第3期22卷 229-232页

作者： Janine david Porthcawl Medical Centre Porthcawl S Wales CF36 5DJ UK.

The general practitioner(GP)is pivotally placed as an access point to provide holistic healthcare for *** are the gateway to men's *** is the GP who has the power to impact on the present health and ameliorate the future health of *** active health promotion and targeted advice and investigation,the healthcare shy man has the potential to look forward to a healthier,more fulfilled,and active life.

关键词： gateway promotion placed

Picard’s theorem and the Rickman construction

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Science China Mathematics 2010年第3期53卷 523-532页

作者： DRASIN david Department of Mathematics Purdue University

Nevanlinna theory (value-distribution theory) has its genesis in Picard’s discovery that a function analytic in the plane which omits two values is constant. Nearly a century later, attention turned to the analogous situation in Rn, n≥3, where entire functions are necesarily replaced by entire quasiregular mappings. This expository article centers on one of Seppo Rickman’s main contributions to this issue, including an outline of his famous example showing that the omitted set in R3, while finite, can be much larger than possible in the plane.

关键词： quasiregular mappings Picard’s theorem Rickman construction

On the relevance of analytical film thickness EHD equations for isothermal point contacts: Qualitative or quantitative predictions?

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Friction 2016年第4期4卷 369-379页

作者： Jean-david WHEELER Philippe VERGNE Nicolas FILLOT david PHILIPPON Univ Lyon INSA Lyon CNRS LaMCoS-UMR5259 Villeurbanne F-69621 France

Thin film and elastohydrodynamic lubrication regimes are rather young domains of tribology and they are still facing unresolved *** they rely upon a full separation of the moving surfaces by a thin (or very thin) fluid film,the knowledge of its thickness is of paramount importance,as for instance to developing lubricated mechanisms with long lasting and efficient *** a consequence,a large collection of formulae for point contacts have been proposed in the last 40 ***,their accuracy and validity have rarely been *** purpose of this paper is to offer an evaluation of the most widespread analytical formulae and to define whether they can be used as qualitative or quantitative *** methodology is based on comparisons with a numerical model for two configurations,circular and elliptical,considering both central and minimum film thicknesses.

关键词： thin film lubrication elastohydrodynamic lubrication (EHL) film thickness prediction EHD analytical equation central film thickness minimum film thickness circular contacts elliptical contacts

Ordovician Intrusive-related Gold-Copper Mineralization in West-Central New South Wales, Australia

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Acta Geologica Sinica(English Edition) 2000年第4期74卷 807-826页

作者： david COOKE Centre for Ore Deposit Research University of Tasmania GPO Box 252-79Hobart 7001 Tasmania Australia

Three major types of Ordovician intrusive-related gold-copper deposits are recognized in central-west New South Wales, Australia: porphyry, skarn and high sulphidation epithermal deposits. These deposits are mainly distributed within two Ordovician volcano-intrusive belts of the Lachlan Fold Belt: the Orange-Wellington Belt and the Parkes-Narromine Belt. Available isotopic age data suggest that mineralization of the three types of deposits is essentially coeval with the Ordovician intrusive rocks (480-430 Ma).Porphyry gold-copper deposits can be further divided into two groups. The first group is associated with monzonite showing shoshonitic features, represented by Cadia and Goonumbla. The second group is associated with diorite and dacite, including the Copper Hill and Cargo gold-copper deposits. Gold skarn is associated with Late Ordovician (430-439 Ma) monzonitic intrusive complexes in the Junction Reefs area (Sheahan-Grants, Frenchmans, and Cor-nishmens), Endeavour 6, 7 and 44, Big and Little Cadia. The epithermal gold deposits with high sulphidation including Gidginbung (Temora) and Peak Hill mainly occur within Ordovician andesite and volcaniclastic rocks, and are associated with advanced argillic alteration. Available isotopic age data indicate that both alteration and mineralization of the porphyry, skarn and epithermal gold-copper deposits are broadly coeval with the Late Ordovician shoshonitic magmatism, which is thought to result from the melting of sub-continental lithosphere caused by Palaeozoic subduction *** Ordovician intrusive-related gold-copper deposits are restricted to two longitudinal parallel volcano-intrusive belts, rarely extending outside them. Diagonal intra-belt trends of mineralization are common, particularly at the intersections of longitudinal and transverse (oblique) fault/fracture zones based on the authors' review of available geological data. The locations of these gold-copper deposits are obviously influenced by transvers

关键词： intrusive-related gold-copper deposit porphyry gold-copper deposit New South Wales Australia diagonal intra-belt trend

Fast and convergence-guaranteed algorithm for linear separation

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Science China(Information Sciences) 2010年第4期53卷 729-737页

作者： ZHANG david Center for Multimedia Signal Processing/Department of Computing Hong Kong Polytechnic University

Efficient linear separation algorithms are important for pattern classification applications. In this paper, an algorithm is developed to solve linear separation problems in n-dimensional space. Its convergence feature is proved. The proposed algorithm is proved to converge to a correct solution whenever the two sets are separable. The complexity of the proposed algorithm is analyzed, and experiments on both randomly generated examples and real application problems were carried out. While analysis shows that its time complexity is lower than SVM that needs computations for quadratic programming optimization, experiment results show that the developed algorithm is more efficient than the least-mean-square (LMS), and the Perceptron.

关键词： linear separation problem classification convergence efficiency complexity

The nitrogen cycle,scientific uncertainty and policy relevant science

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Science China(Life Sciences) 2005年第Z2期48卷 807-817页

作者： david Norse Department of Geography University College London WCIH OBTUK

Much of the research on the nitrogen cycle aims to improving scientific understanding but is not focused specifically on removing or reducing the scientific uncertainties that constrain policy makers in the formulation of appropriate responses to old or emerging environmental problems. Policy makers, for example, commonly find it difficult to assess the spatial or temporal importance of the various risks to human and ecosystem health that stem from man's interference with the natural N cycle. This paper will justify this conclusion by reference to the findings of a recent study on non-point pollution from crop production in China. The findings concern the perceived risks of groundwater nitrate to human health; uncertainties about critical NOx levels and their interactions with other pollutants; various other dimensions of man's impact on the N cycle. The paper will go on to suggest a more systematic process or pathway by which scientists can select and design their research in a manner that could give more effective support to policy makers.

关键词： Policy relevant science, non-point pollution in China, scientific uncertainty and research design.