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A proposal on complementary determination of the effective electro-weak mixing angles via doubly heavy-flavored hadron production at a super Z-factory

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Science China(Physics,Mechanics & Astronomy) 2020年第8期63卷 61-70页

作者： Xu-Chang Zheng Chao-Hsi Chang tai-Fu feng Key Laboratory of Theoretical Physics Institute of Theoretical PhysicsChinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China Department of Physics Chongqing UniversityChongqing 401331China China Center of Advanced Science and Technology(CCAST)(World Laboratory) Beijing 100190China Department of Physics Hebei UniversityBaoding 071002China

To test the standard model(SM)precisely and to look for the clues deviating from SM,a proposal for determining the effective electro-weak mixing angles sin2θefff(particularly f=lept,c,b)is *** is via observing the asymmetries(the forward-backward one AFB,the left-right one ALR and the combined left-right forward-backward one ALRFB)of the doubly heavy-flavored hadrons in the production at a super Z-factory(an e+e-collider designed with a luminosity as high as possible for modernday techniques runs around the center-of-mass energy s1/2=mZ).To see the sensitivity,uncertainties as well as the event accumulation precisely,the observables for describing the asymmetries of the produced hadrons are computed numerically with varying effective mixing angles,and based on the result analyses,it is concluded that the proposal may offer an independent complement determination of the effective mixing angles.

关键词： electro-weak mixing angle production of doubly heavy-flavored hadron asymmetries super Z-factory

Theoretical Study of Similar Experimental Method for Durability of Concrete under Artifi cial Climate Environment

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Journal of Wuhan University of Technology(Materials Science) 2016年第2期31卷 345-354页

作者：耿欧 feng tai LI Debao LI Qingtao School of Mechanics and Civil Engineering China University of Mining and Technology Xuzhou 221116 China Jiangsu Key Laboratory of Environmental lmpact and Structural Safety in Engineering China University of Mining and Technology Xuzhou 221116China State Key Laboratory for Geomechanics and Deep Underground Engineering China University of Mining and Technology Xuzhou 221116 China

Based on the similarity theory,a new experimentalmethod named Similar ExperimentalMethod for Durability of Concrete（SEMDC）was *** existing experimentalmethods for durability of concrete were summarized,and the merits and demerits of these experimentalmethods were *** factors affecting the durability of concrete were found through literature *** factors were analyzed and the similarity criteria were established according to the similarity theory,and then the SEMDC was established according to the rules of these *** various influentialfactors of the experimentalmethod were analyzed and the merits and demerits of this new experimentalmethod were *** to SEMDC,changing the geometry shrinkage ratio was the only way to accelerate the test in order to keep the experiment similar to the *** were few other parameters which need to be changed in SEMDC,making the test easy to be *** to SEMDC,time shrinkage ratio was the square of geometric shrinkage ratio,so an appropriate increase of the geometric shrinkage ratio could accelerate the ***,an example of experimentaldesign for durability of concrete was devised theoretically base on SEMDC theory.

关键词： concrete similarity theory artifi cial climate similar experiment accelerate durability

Nuclear 0ν2βdecays in B-L symmetric SUSY model and in TeV scale left–right symmetric model

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Communications in Theoretical Physics 2022年第8期74卷 76-92页

作者： Jin-Lei Yang Chao-Hsi Chang tai-Fu feng CAS Key Laboratory of Theoretical Physics Institute of Theoretical PhysicsChinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China Department of Physics Hebei UniversityKey Laboratory of High-precision Computation and Application of Quantum Field Theory of Hebei ProvinceBaoding071002China

In this paper,we take the B-L supersymmetric standard model(B-LSSM)and TeV scale left–right symmetric model(LRSM)as two representations of the two kinds of new physics models to study the nuclear neutrinoless double beta decays(0ν2β)so as to see the senses onto these two kinds of models when the decays are taken into account *** the parameter spaces allowed by all the existing experimental data,the decay half-life of the nucleus^(76)Ge and^(136)Xe,T_(12)^(0ν)(^(76)Ge,^(136)Xe),is precisely calculated and the results are presented *** on the numerical results,we conclude that there is greater room for LRSM type models than for B-LSSM type models in foreseeable future experimental observations on the decays.

关键词： B-LSSM QCD correction neutrinoless double beta decay LRSM

Effects of nano-sized Ag reinforcing particulates on the microstructure of Sn-0.7Cu solder joints

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International Journal of Minerals,Metallurgy and Materials 2009年第6期16卷 677-684页

作者： feng tai Fu Guo Zhi-dong Xia Yong-ping Lei Yao-wu Shi College of Materials Science and Engineering Beijing University of Technology Beijing 100124 China

Composite solders were prepared by mechanically dispersing different volumes of nano-sized Ag particles into the Sn-0.7Cu eutectic solder. The effects of Ag particle addition on the microstructure of Sn-0.7Cu solder joints were investigated. Besides, the effects of isothermal aging on the microstructural evolution in the interfacial intermetallic compound （IMC） layer of the Sn-0.7Cu solder and the composite solder reinforced with 1vol% Ag particles were analyzed, respectively. Experimental results indicate that the growth rate of the interfacial IMC layer in the Ag particles reinforced composite solder joint is much lower than that in the Sn-0.7Cu solder joint during isothermal aging. The Ag particles reinforced composite solder joint exhibits much lower layer-growth coefficient for the growth of the IMC layer than the corresponding solder joint.

关键词： lead-free solder composite solder intermetallic compounds microstructure isothermal aging

Restudy on Time-Evolution of SUSY Dark Matter

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Communications in Theoretical Physics 2002年第10期38卷 503-508页

作者： feng tai-Fu LI Xue-Qian MENG Qing-Wei REN Zhen-Yu Institutc of High Energy Physics Academia Sinica P.O. Box 918-4 Beijing 100039 China CCAST World Lab P.O. Box 8730 Beijing 100080 China Department of Physics Nankai University Tianjin 300071 China Department of Physics Nankai University Tianjin 300071 China Institutc of High Energy Physics Academia Sinica P.O. Box 918-4 Beijing 100039 China Department of Physics Nankai University Tianjin 300071 China

We restudy the Lee-Weinberg time-evolution equation including the R-parity violation. We carefullyanalyze the intluence of the boundary conditions, equation of state, SUSY parameters, especially the R-parity violation,and other factors on the time-evolution of the SUSY cold dark matter. Our numerical results show that without Rparity violation, only two ranges 20 ＜ mx01 ＜ 30 GeV and 75 ＜ mx01 ＜ 110 GeV can be consistent with data, if30 ＜ mx01 ＜ 75 GeV, there must be at least two kinds of heavy particles contributing to the cold dark matter. However,with the R-parity violation, the heavy neutralino can be dark matter constituent, but it must decay and the R-parityviolation parameter is constrained by the present data.

关键词： SUSY dark matter, time evolution

Kaluza-Klein Corrections to the μ Anomalous Magnetic Moment in the Appelquist-Cheng-Dobrescu Model

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Chinese Physics Letters 2012年第9期29卷 28-31页

作者： CHEN Jian-Bin feng tai-Fu GAO Tie-Jun Department of Physics Dalian University of TechnologyDalian 116024

Applying the effective Lagrangian method,we analyze the radiative contributions of the Kaluza–Klein(KK)modes to the muon magnetic dipole moments in the Appelquist–Cheng–Dobrescu *** over the infinite series composed by the KK towers,we verify the final results satisfying the decoupling theorem in the limit R^(-1)→∞.For the compactification scale R^(-1)=300 GeV,we obtain the electroweak radiative corrections from the KK modes to the muon MDM amount to 6.72×10^(-12) at one loop level.

关键词： radiative satisfying correction

Metabolism of benzo[a]pyrene in peroxynitrite/Fe(III) porphyrin system

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Journal of Environmental Sciences 2007年第4期19卷 385-386页

作者： LUO Yun-jing LIN tai-feng ZHANG Shu-fen LIU Rui ZHONG Ru-gang College of Life Science and Bioengineering Beijing University of Technology Beijing 100022 China.

The peroxynitrite/porphyrin biomimetic system was established to investigate the effects of peroxynitrite on benzo[a]pyrene （B[a]P） metabolism. Three model systems consisting of different iron porphyrins were compared, and the results showed that the peroxynitdte/T（p-Cl）PPFeCl system was the highest catalytic efficiency in the metabolism of B [a]P. We analyzed the B [a]P metabolites produced from this system by RP-HPLC method and firstly identified the formation of nitrobenzo[a]pyrenes which are the special metabolites of B [a]P induced by peroxynitrite.

关键词： peroxynitrite benzo[a]pyrene metabolism nitrobenzo[a]pyrenes

The 2022 record-breaking high temperature in China:Sub-seasonal stepwise enhanced characteristics,possible causes and its predictability

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Advances in Climate Change Research 2023年第5期14卷 651-659页

作者： Yuan-Yuan MA Yi-Ting CHEN Xiao-Xue HU Qian-Rong MA tai-Chen feng Guo-Ling feng Di MA Key Laboratory of Land Surface Process and Climate Change in Cold and Arid Regions Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou 730000China School of Physical Science and Technology Yangzhou UniversityYangzhou 225127China College of Atmospheric Sciences Lanzhou UniversityLanzhou 730000China School of Atmospheric Sciences Key Laboratory of Tropical Atmosphere-Ocean SystemMinistry of EducationSun Yat-sen UniversityZhuhai 519082China Southern Marine Science and Engineering Guangdong Laboratory Zhuhai 519082China

In the summer of 2022,an unprecedented and long-lasting high temperature swept central-eastern China,causing significant societal ***,the sub-seasonal characteristics,causes and predictability of this extreme high temperature event are not well *** on the locations,intensities and causes of the high temperature,we divided it into three stages:early(13 June-3 July),sustained(4-28 July),and enhancement(29 July-30 August)*** high temperature during the early stage mainly occurred in north-central China with an anomaly of 2.5℃compared with climatology(1981-2010),while the last two stages occurred in the middle and lower Yangtze River Basin with anomalies of 2.8 and 3.8℃*** high temperature during the three stages were all regulated by the strengthening and westward extension of the western Pacific subtropical high(WPSH)but involved different physical *** the early stage,it was mainly caused by the anticyclones over the Mongolia and Northwest Pacific and enhanced by the minor impact of *** the sustained stage it was influenced by relatively more stronger WPSH and South Asia high(SAH)and the relatively minor impact of the anticyclone over the north-western South *** the enhancement stage,the high temperature was mainly caused by a combination of the record-breaking WPSH and SAH and the strong European blocking ***,the exceptionally powerful WPSH was well correlated with the sea surface temperature gradient induced by the developing La Niñ*** ECMWF and NCEP models reasonably predicted the location and intensity of the high temperature in the early stage,but poorly predicted that in the sustained and enhancement stages partly because of the failure prediction of the WPSH's enhancement and westward *** ECMWF model's more accurate prediction of the WPSH may contribute to its better forecasting of the heatwaves.

关键词： High temperature Sub-seasonal characteristics Western Pacific subtropical high La Niña development phase Predictability

Systematic investigation of SO_(2) adsorption and desorption by porous powdered activated coke:Interaction between adsorption temperature and desorption energy consumption

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Chinese Journal of Chemical Engineering 2022年第8期35卷 140-148页

作者： Jun Li Liqiang Zhang Xiao Zhu Mengze Zhang tai feng Xiqiang Zhao Tao Wang Zhanlong Song Chunyuan Ma National Engineering Laboratory for Reducing Emissions from Coal Combustion Engineering Research Center of Environmental Thermal Technology of Ministry of EducationShandong Key Laboratory of Energy Carbon Reduction and Resource UtilizationSchool of Energy and Power EngineeringShandong UniversityJinan 250061China College of Mechanical and Electronic Engineering Shandong University of Science and TechnologyQingdao 266590China

Porous carbon materials have been widely used for the removal of SO_(2) from flue *** main objective of this work is to clarify the effects of adsorption temperature on SO_(2) adsorption and desorption energy ***-based porous powdered activated coke(PPAC)prepared in the drop-tube reactor was used in this *** N_(2) adsorption measurements and Fourier transform infrared spectrometer analysis show that PPAC exhibits a developed pore structure and rich functional *** experimental results show that with a decrease in adsorption temperature in the range of 50–150℃,the adsorption capacity of SO_(2) increases linearly;meanwhile,the adsorption capacity of H_(2)O increases,resulting in the increase in desorption energy consumption per unit mass of *** processes of SO_(2) and H_(2)O desorption were determined by the temperature-programmed desorption test,and the desorption energies for each species were *** the energy consumption per unit of desorption and the total amount of adsorbent,the optimal adsorption temperature yielding the minimum total energy consumption of regeneration is *** study systematically demonstrates the effect of adsorption temperature on the adsorption–desorption process,providing a basis for energy saving and emission reduction in desulfurization system design.

关键词： Activated coke SO2 adsorption Desorption energy consumption Optimal adsorption temperature