检索结果-南通市图书馆

Potential Gene therapy targets in Burns-p38 and p38 MAP K

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

微循环学杂志 2009年第4期 92-93页

作者： ulf t.brunk Division of Pharmacology Faculty of Health SciencesLinkping University

Microvascular barrier damage,induced by thermal injury,imposes a life-threatening problem owing to the pathophysiological consequences of plasma loss and impaired perfusion that finally may lead to multiple organ fail... 详细信息

关键词： MAPKs Potential Gene therapy targets in Burns-p38 and p38 MAP K

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

质子磁荷半径:新疑难?

Science Bulletin 2024年第4期69卷 419-421页

作者：林勇辉 Hans-Werner Hammer ulf-G.Meiûner Helmholtz Institut für Strahlen-und Kernphysik and Bethe Center for theoretical Physics Universität BonnBonn D-53115Germany technische Universität Darmstadt Department of PhysicsInstitut für KernphysikDarmstadt 64289Germany ExtreMe Matter Institute EMMI and Helmholtz Forschungsakademie Hessen für FAIR GSI Helmholtzzentrum für Schwerionenforschung GmbHDarmstadt 64291Germany Institute for Advanced Simulation and Institut für Kernphysik Forschungszentrum JülichJülich D-52425Germany tbilisi State University Tbilisi 0186Georgia

the electric radius,rE,and the magnetic radius,rM,of the proton are fundamental quantities of low-energy QCD,as they are a measure of the probe-dependent size of the proton.

关键词： radius quantities fundamental

Isospin violation,light quark masses,and all that

在线全文

学校读者我要写书评

暂无评论

Chinese Physics C 2010年第9期34卷 1163-1168页

作者： ulf-G.Meiβner HISKP and Bethe Center for theoretical Physics Universitt Bonn IKP-3 IAS-4 and JCHPForschungszentrum Jülich

Isospin violation is driven through the light quark mass difference and electromagnetic effects.I review recent progress in extracting the light quark mass difference and tests of the chiral dynamics of Quantum Chromo... 详细信息

关键词： quantum chromodynamics isospin violation quark masses chiral Lagrangians

Anthropic considerations in nuclear physics

在线全文

学校读者我要写书评

暂无评论

Science Bulletin 2015年第1期60卷 43-54页

作者： ulf-G.Meiner Helmholtz-Institut fü r Strahlen- und Kernphysik (theorie) and Bethe Center for theoretical Physics Universitt BonnD-53155 Bonn Germany Institute for Advanced Simulation (IAS-4) Institut fu¨ rKernphysik (IKP-3) J lich Center for Hadron PhysicsJARA HPC and JARA FAME Forschungszentrum Ju¨ lichD-52425 Ju¨ lich Germany Kavli Institute for theoretical Physics China Chinese Academy of Sciences

In this short review, I discuss the sensitivity of the generation of the light and the life-relevant elements such as carbon and oxygen under changes of the parame- ters of the Standard Model pertinent to nuclear physics. Chiral effective field theory allows for a systematic and precise description of the forces between two, three and four nucleons. In this framework, variations under the light quark masses and the electromagnetic fine-structure constant can also be consistently calculated. Combining chiral nuclear effective field theory with Monte Carlo simulations allows to further calculate the properties of nuclei, in particular of the Hoyle state in carbon, that plays a crucial role in the gener- ation of the life-relevant elements in hot, old stars. the dependence of the triple-alpha process on the fundamental constants of nature is calculated, and some implications for our anthropic view of the Universe are discussed.

关键词： Anthropic principle Nuclear physics Effective field theory

Diffusion-controlled Adsorption Kinetics at Air/Solution Surface Studied by Maximum Bubble Pressure Method

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Engineering 2004年第4期12卷 577-581页

作者：刘俊吉王创业 MESSOW ulf School of Science Tianjin University Tianjin 300072 China solution at temperature 25℃were measuredby means of Wilhelmy plate method and maximal bubble pressure method respectively. As t→0 the theoreticalanalysis is in good agreement with experimental results and the dependence of γ(t) on is linear.

In studying the diffusion-controlled adsorption kinetics of aqueous surfactant solutions at the air/solution surface by means of the maximal bubble pressure method, Fick's diffusion equation for a sphere should be used. In this paper the equation was solved by means of Laplace transformation under different initial and boundary conditions. the dynamic surface adsorption F(t) for a surfactant solution, which was used to describe the diffusion-controlled adsorption kinetics at the solution surface, was derived. Different from the planar surface adsorption, the dynamic surface adsorption F(t) for the short time consists of two terms: one is the same as Ward-tordai equation and the other reflects the geometric effect caused by the spherical bubble surface. this effect should not be neglected for the very small radius of the capillary. the equilibrium surface tension γeq and the dynamic surface tension γ(t) of aqueous C10E6 [CH3(CH2)9(OCH2CH2)6OH] solution at temperature 25℃ were measuredby means of Wilhelmy plate method and maximal bubble pressure method respectively. As t→ 0, the theoreticalanalysis is in good agreement with experimental results and the dependence of γ(t) on is linear.

关键词： diffusion-controlled adsorption kinetics dynamic surface tension maximum bubble pressure method

the proton radius:from a puzzle to precision

在线全文

学校读者我要写书评

暂无评论

Science Bulletin 2020年第4期65卷 257-258页

作者： Hans-Werner Hammer ulf-GMeiBner Institut für Kernphysik Technische Universitat Darmstadt64289 DarmstadtGermany ExtreMe Matter Institute EMMI GSI Helmholtzzentrum für Schwerionenforschung GmbH64291 DarmstadtGermany Helmholtz Institut für Strahlen-und Kernphysik and Bethe Center for theoretical Physics Universitat BonnD-53115 BonnGermany Institute for Advanced Simulation and Institut für Kernphysik Forschungszentrum JülichD-52425 JülichGermany tbilisi State University 0186 TbilisiGeorgia

the proton charge radius rP is a fundamental quantity in particle physics,as it challenges our understanding of the so successful Standard Model in the non-perturbative regime of the strong *** is defined by the slope of the proton charge form factor GE p ett at zero momentum transfer,with t the invariant four-momentum transfer *** proton charge radius was first indirectly measured in the Nobel prize winning electron scattering experiments by Hofstadter et al.[1,2],who fitted the form factor data with a dipole form and extracted the radius from the slope of the dipole.

关键词： DISPERSION-tHEOREtICAL ANALYSIS FORM-FACtORS NUCLEON SCAttERING HYDROGEN SIZE

On the constituent counting rule for hard exclusive processes involving multi-quark states

在线全文

学校读者我要写书评

暂无评论

Chinese Physics C 2017年第5期41卷 91-96页

作者：郭奉坤 ulf-G.Mei?ner 王伟 State Key Laboratory of theoretical Physics Institute of Theoretical PhysicsChinese Academy of Sciences Helmholtz-Institut fr Strahlen- und Kernphysik and Bethe Center for theoretical Physics Universitt Bonn Institute for Advanced Simulation Institut fr Kernphysik and Jlich Center for Hadron PhysicsForschungszentrum Jlich INPAC Shanghai Key Laboratory for Particle Physics and CosmologyDepartment of Physics and AstronomyShanghai Jiao-Tong University

At high energy,the cross section at finite scattering angle of a hard exclusive process falls off as a power of the Manderstam variable *** all involved quark-gluon compositions undergo hard momentum transfers,the fall-off scaling is determined by the underlying valence structures of the initial and final hadrons,known as the constituent counting *** spite of the complication due to helicity conservation,it has been argued that when applied to exclusive process with exotic multiquark states,the counting rule is a powerful way to determine the valence degrees of freedom inside hadron *** this work,we demonstrate that for hadrons with hidden flavors,the naive application of the constituent counting rule is problematic,since it is not mandatory for all components to participate in hard scattering at the scale s1/*** illustrate the problems in the viewpoint based on effective field *** clarify the misleading results that may be obtained from the constituent counting rule in exclusive processes with exotic candidates such as Z_c~±（cd/cu）,Z_b~±（bd/bdu）,X（3872）,etc.

关键词： quark exclusive constituent hadron meson exotic problematic clarify momentum valence

High level of deoxycholic acid in human bile does not promote cholesterol gallstone formation

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2003年第7期9卷 1576-1579页

作者： ulf Gustafsson Staffan Sahlin Curt Einarsson Department of Surgery Danderyd HospitalStockholmSweden Division of Gastroenterology and Hepatology Department of MedicineHuddinge University HospitalKarolinska InstitutetStockholmSweden

AIM:to study whether patients with excess deoxycholic acid (DCA) differ from those with normal percentage of DCA with respect to biliary lipid composition and cholesterol saturation of gallbladder bile. MEtHODS:Bile was collected during operation through puncturing into the gallbladder from 122 cholesterol gallstone patients and 46 gallstone-free subjects undergoing *** data,biliary lipids,bile add composition, presence of crystals and nucleation time were analyzed. RESULtS:A subgroup of gallstone patients displayed a higher proportion of DCA in bile than gallstone free subjects. By choosing a cut-off level of the 90th percentile,a group of 13 gallstone patients with high DCA levels (mean 50 percent of total bile acids) and a large group of 109 patients with normal DCA levels (mean 21 percent of total bile acids) were *** mean age of the patients with high DCA levels was higher than that of the group with normal levels (mean age:62 years vs45 years) and so was the mean BMI (28.3 vs.24.7).Plasma levels of cholesterol and triglycerides were slightly higher in the DCA excess groups compared with those in the normal DCA *** was no difference in biliary lipid composition,cholesterol saturation,nucleation time or occurrence of cholesterol crystals in bile between patients with high and normal levels of DCA. CONCLUSION:Gallstone patients with excess DCA were of older age and had higher BMI than patients with normal *** two groups of patients did not differ with respect to biliary lipid composition,cholesterol saturation,nucleation time or occurrence of cholesterol *** is concluded that DCA in bile does not seem to contribute to gallstone formation in cholesterol gallstone patients.

关键词： Adolescent Adult Aged Aged, 80 and over Bile Body Mass Index Cholesterol Crystallization Deoxycholic Acid Female Gallstones Humans Lipids Male Middle Aged Research Support, Non-U.S. Gov't

Neutron-antineutron oscillations in the deuteron studied with NN and ■N interactions based on chiral effective field theory

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

Chinese Physics C 2020年第3期44卷 28-32页

作者： Johann Haidenbauer ulf-G.Meiβner Institute for Advanced Simulation Institut für Kernphysik and Jülich Center for Hadron PhysicsForschungszentrum JülichD-52425 JülichGermany Helmholtz-Institut für Strahlen-und Kernphysik and Bethe Center for theoretical Physics Universität Bonn53115 BonnGermany tbilisi State University 0186 TbilisiGeorgia

Neutron-antineutron(n−n)oscillations in the deuteron are ***,the deuteron lifetime is calculated in terms of the free-space n−n oscillation time τn−n based on NN and NN interactions derived within chiral effective field theory(EFt).this results in(2.6±0.1)×10^22τ2^n−n s,which is close to the value obtained by Dover and collaborators more than three decades ago,but disagrees with recent EFt calculations that were performed within the perturbative scheme proposed by Kaplan,Savage,and *** reasons for the difference are discussed.

关键词： neutron-antineutron oscillations chiral effective field theory NN interaction antinucleon-nucleon interaction