检索结果-南通市图书馆

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

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(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

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

在线全文

学校读者我要写书评

暂无评论

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

Historical development of the Gauss-Bonnet theorem

在线全文

学校读者我要写书评

暂无评论

Science China Mathematics 2008年第4期51卷 777-784页

作者： wu Hung-hsi(H.wu) Department of Mathematics University of California

A historical survey of the Gauss-Bonnet theorem from Gauss to Chern.

关键词： Gauss-Bonnet theorem Chern classes characteristic classes 01-02 53-03 53C20

Properties of Titanium isotopes in complex momentum representation within relativistic mean-field theory

在线全文

学校读者我要写书评

暂无评论

Nuclear Science and Techniques 2022年第9期33卷 93-100页

作者： tai-Hua Heng Yao-wu Chu School of Physics and Optoelectronic Engineering Anhui UniversityHefei 230601China

The self-consistent quadruple potential is deduced within the relativistic mean-field(RMF)framework and substituted into the Hamiltonian,which is calculated using the complex momentum representation(CMR).Considering even-even titanium isotopes as an example,this study investigated various properties,including the resonant states of neutron-rich nuclei in the RMF-CMR model,and used them to describe the binding *** abrupt decrease in the two-neutron separation energy(S_(2n))corresponds to the traditional magic *** resonant and bound states are simultaneously exposed in the complex moment plane,where the continuum is along the integration *** four oblate neutron-rich nuclei^(72-78)Ti are weakly bound or resonant because their Fermi energies are approximately 0 *** root-meansquare(RMS)radii of these nuclei increase suddenly compared with those of others(neutron number N<48).Moreover,^(78)Ti and^(76)Ti are determined as drip-line nucleons by the value of S_(2n) and the energy levels,***,the weak-bounded character can be represented by diffuse density probability distributions.

关键词： Resonant states Self-consistent potential Complex momentum representation

Research on the Synchronization of Modulation Hopping System:I Synchronization Scheme

在线全文

学校读者我要写书评

暂无评论

China Communications 2009年第4期6卷 148-154页

作者： tai Nengjian wu Dewei wu Jie Li Ting The Telecommunication Engineering Institutel Air Force Engineering University Xi＇an 710077 China No.94782 Unit of PLA Hangzhou 310021 China

In order to achieve fast synchronization of the modulation hopping system, a synchronization scheme called short code to guide long code is adopted, and the initial synchronization hops and service hops are designed in *** to the system requirements for short code in the properties of time-varying, safety and balance, an algorithm to design wide-gap chaos short code based on TOD is *** performance analysis shows that the algorithm has good performance, the initial synchronization time and the later entering network synchronization time are short, additionally, maximum synchronization time difference and synchronization maintaining time are long, all of which meet the needs of normal communications, and further verify the synchronization scheme feasible.

关键词： secure communication modulation hopping synchronization

Mixing times in single and multi-orifice-impinging transverse(MOIT) jet mixers with crossflow

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Engineering 2016年第7期24卷 825-831页

作者： Peicheng Luo Yuncui tai Yi Fang Hua wu School of Chemistry & Chemical Engineering Southeast University Nanjing 211189 China Institute for Chemical and Bioengineering Department of Chemistry and Applied Bioscience ETH Zurich 8093 Zurich Switzerland

We study the macromixing behavior of single and multi-orifice-impinging transverse(MOIT) jet mixers with crossflow, in particular, the overall mixing time and the back-splash mixing time of the injected flow with the crossflow, using the PLIF technique. It is found that for a given mixer configuration, there is a critical jet-tocrossflow velocity ratio rcat which the back-splash begins to occur. Further increase in the velocity ratio r leads to sharp increase in the back-splash mixing time, which can offset the intensification of the downstream mixing. The dimensionless overall mixing time decreases as r increases to reach either a plateau or a local minimum, and the corresponding r value represents the optimal velocity ratio roptfor the macromixing. The momentum ratio of the two liquid streams is a key factor determining rcand ropt. For a larger scale mixer, a higher momentum ratio is required to achieve the optimal macromixing with the minimum dimensionless overall mixing time.

关键词： MixingChemical reactorsMixing timeJet mixerPlanar laser induced fluorescence (PLIF)

Prediction of the global potential geographical distribution of Hylurgus ligniperda using a maximum entropy model

在线全文

学校读者我要写书评

暂无评论

Forest Ecosystems 2022年第4期9卷 449-459页

作者： Zhuojin wu tai Gao Youqing Luo Juan Shi Beijing Key Laboratory for Forest Pest Control Beijing Forestry UniversityBeijing100083China Sino-France Joint Laboratory for Invasive Forest Pests in Eurasia Beijing Forestry UniversityBeijing100083China State Key Laboratory of Rice Biology Institute of Insect SciencesZhejiang UniversityHangzhou310058China

Background: Hylurgus ligniperda(Fabricius) is native to Europe but has established populations in many countries and regions. H. ligniperda mainly infests Pinus species, and can cause severe weakness and even death of the host through its boring activity;it can also be a vector of various pathogenic fungi. This study was conducted to investigate the environmental variables limiting the distribution of H. ligniperda and the change trend of its suitable areas under climate ***: We used a maximum entropy model to predict the potential geographical distribution of H. ligniperda on a global scale under near current and future climatic scenarios using its occurrence data and environmental variables. The result shows that the areas surrounding the Mediterranean region, the eastern coastal areas of Asia, and the southeastern part of Oceania are highly suitable for H. ligniperda. The environmental variables with the greatest effect on the distribution of H. ligniperda were determined using the jackknife method and Pearson’s correlation analysis and included the monthly average maximum temperature in April, precipitation of driest quarter, the monthly average minimum temperature in December, precipitation of coldest quarter, mean temperature of driest quarter and mean diurnal ***: Excessive precipitation in winter and low temperatures in spring had a great effect on the distribution of H. ligniperda. The potential geographical distribution of H. ligniperda was predicted to change under future climatic conditions compared with near current climate conditions. Highly suitable areas, moderately suitable areas and low suitable areas were predicted to increase by 59.99%, 44.43% and 22.92%, respectively, under the2081–2100 ssp245 scenario.

关键词： Climate change Hylurgus ligniperda Invasive pest Maximum entropy model Potential geographical distribution

Synthesis of 5-Substituted-3-[(2’R,4’R)-4’-Hydroxy-2’-hydroxymethyltetrahydrofuran-4’-yl]-1,2,4-oxadiazoles and Their Epimers

在线全文

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2001年第4期17卷 407-414页

作者： wu Wei-dong MA Ling-tai ZHANG Li-he National Laboratory of Natural and Biomimetic Drugs School ofPharmaceutical SciencesPeking UniversityBeijing 100083P.R.China

The syntheses of 5-substituted-3-[( 2’ R, 4’ R)-4 ’ -hydroxy-2 ’ -hydroxymethyltetra-hydrofuran-4’ -yl]D-1 ,2, 4-oxadiazoles and their epimers were accomplished with the aid of th construction of 1,2, 4-oxadiazoles by condensation of O-acylated cyanohydrins with hydroxylamine via intramolecular transacylation and subsequent cyclization.

关键词： Nucleoside analogue 1,2,4-Oxadiazole Transacylation

Borophene-ZnO heterostructures:Preparation and application as broadband photonic nonvolatile memory

在线全文

学校读者我要写书评

暂无评论

Nano Research 2023年第4期16卷 5826-5833页

作者： Runsheng Liu Chuang Hou Xinchao Liang Zitong wu Guoan tai The State Key Laboratory of Mechanics and Control of Mechanical Structures and Laboratory of Intelligent Nano Materials and Devices of Ministry of Education College of Aerospace EngineeringNanjing University of Aeronautics and AstronauticsNanjing 210016China

High-performance photonic nonvolatile memory which combines data storage and photosensing can achieve low power consumption and ensure computational energy *** has been theoretically and experimentally proved to have synergistic effects between two materials,which can lead to promising electronic and optical properties for advanced optoelectronic ***,we report the preparation of borophene-ZnO heterostructures and their applications of broadband photonic nonvolatile *** memory shows a good switching ratio(5×10^(3))and long-term stability(3,600 s),which are superior to those of the pristine borophene or ZnO quantum dots(QDs).It is found that the memory shows a broad light response from ultraviolet(365 nm)to near infrared(850 nm).Besides,the SET voltage will decrease when the device is exposed to light,which can be attributed to the separation of holes and electrons in accelerating the formation of vacancy conductive *** work not only provides a promising material for next-generation photoelectric information,but also paves the way for borophene-based memory towards data storage devices.

关键词： borophene ZnO heterostructure photoluminescence(PL)quenching nonvolatile memory light control