检索结果-南通市图书馆

Boron-doped carbon dots:Doping strategies,performance effects,and applications

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2024年第7期35卷 100-106页

作者： Qiang Fu Shouhong Sun Kangzhi Lu Ning Li Zhanhua Dong college of engineering Qufu Normal UniversityRizhao 276826China

Due to their superior fluorescence,phosphorescence,and catalytic capabilities,carbon dots(CDs),an emerging class of fluorescent carbon nanomaterials,have a wide range of potential *** properties of CDs have recently been controlled extensively by heteroatom *** atoms have been effectively doped into the structure of CDs due to their similar size to carbon atoms and excellent electron-absorbing ability to further improve the performance of *** this review,we summarize the research progress of boron-doped CDs in recent years from the aspects of doping strategies,effects of boron doping on different performances of CDs and *** from the two aspects of single boron doping and boron and other atom co-doping,from different precursor materials to different synthesis methods,the doping strategies of boron-doped CDs are reviewed in ***,the effects of boron doping on the fluorescence,phosphorescence and catalytic performance of CDs and applications of boron-doped CDs in optical sensors,information encryption and anti-counterfeiting are ***,we further provide a prospect towards the future development of boron-doped CDs.

关键词： Carbon dots Boron-doped Luminescent material Doping strategies Performance effects

Intrinsic valley-polarized quantum anomalous Hall effect in a two-dimensional germanene/MnI_(2) van der Waals heterostructure

在线全文

学校读者我要写书评

暂无评论

Chinese physics B 2024年第7期33卷 2-7页

作者：董晓晶张昌文 School of physics and Technology Institute of SpintronicsUniversity of JinanJinan 250022China School of physics and Physical engineering Qufu Normal UniversityQufu 273100China

Valley-polarized quantum anomalous Hall effect(VQAHE), combined nontrivial band topology with valleytronics,is of importance for both fundamental sciences and emerging applications. However, the experimental realization of this property is challenging. Here, by using first-principles calculations and modal analysis, we predict a mechanism of producing VQAHE in two-dimensional ferromagnetic van der Waals germanene/MnI_(2) heterostructure. This heterostructure exhibits both valley anomalous Hall effect and VQAHE due to the joint effects of magnetic exchange effect and spin–orbital coupling with the aid of anomalous Hall conductance and chiral edge state. Moreover interestingly, through the electrical modulation of ferroelectric polarization state in In_(2)Se_(3), the germanene/Mn I_(2)/In_(2)Se_(3) heterostructure can undergo reversible switching from a semiconductor to a metallic behavior. This work offers a guiding advancement for searching for VQAHE in ferromagnetic van der Waals heterostructures and exploiting energy-efficient devices based on the VQAHE.

关键词： valley-polarized quantum anomalous Hall effect ferromagnetic

Different coalescence sources of light nucleus production in Au-Au collisions at √sNN=3 GeV

在线全文

学校读者我要写书评

暂无评论

Chinese physics C 2024年第5期48卷 160-179页

作者：王瑞芹吕济鹏李彦豪宋军邵凤兰 School of physics and Physical engineering Qufu Normal UniversityQufu 273165China School of Physical Science and Intelligent engineering Jining UniversityJining 273155China

We study the production of light nuclei in the coalescence mechanism of Au-Au collisions at midrapidity at √sNN=*** derive analytic formulas of the momentum distributions of two bodies,three bodies,and four nucleons coalescing into light nuclei and naturally explain the transverse momentum spectra of the deuteron(d),triton(t),helium-3(3He),and helium-4(4He).We reproduce data on the yield rapidity densities,yield ratios,and averaged transverse momenta of d,t,3He,and 4He and provide the proportions of contributions from different coalescence sources for t,3He,and 4He in their *** find that besides nucleon coalescence,nucleon+nucleus coalescence and nucleus+nucleus coalescence may play requisite roles in light nucleus production in Au-Au collisions at √sNN=3 GeV.

关键词： light nucleus production the coalescence model relativistic heavy ion collision

Heavy neutral leptons in gauged U(1)Lμ-Lτ at muon collider

在线全文

学校读者我要写书评

暂无评论

Chinese physics C 2024年第9期48卷 36-49页

作者： Ru-Yi He Jia-Qi Huang Jin-Yuan Xu Fa-Xin Yang Zhi-Long Han Feng-Lan Shao School of physics and Technology University of JinanJinan 250022China School of physics and Physical engineering Qufu Normal UniversityQufu 273165China

Heavy neutral leptons N are the most appealing candidates to generate tiny neutrino *** studied the signature of heavy neutral leptons in gauged U(1)Lμ-Lτ at a muon *** under the U(1)Lμ-Lτ symmetry,the heavy neutral leptons can be pair produced via the new gauge boson Z' at the muon collider as μ^(+)μ^(-)→Z′*→NN AND μ^(+)μ^(-)→Z′(*)γ→NNγ.We then performed a detailed analysis on the lepton number violation signature μ^(+)μ^(-)→NN→μ^(±)μ^(±)W■W■ and μ^(+)μ^(-)→NN→μ^(±)μ^(±)W■W■γ at the 3 TeV muon collider,where the hadronic decays of W boson are treated as fat-jets *** lepton number violation signatures have quite clean backgrounds at the muon *** simulation shows that a wide range of viable parameter space is within the reach of the 3 TeV muon *** instance,with new gauge coupling g'=0.6 and an integrated luminosity of 1000 fb^(-1),the μ^(±)μ^(±)JJ signal could probe m_(Z′)■13 ***,if the gauge boson mass satisfies 2m_(N)<√s,the μ^(±)μ^(±)JJγ signature would be more promising than the μ^(±)μ^(±)JJ signature.

关键词： heavy neutral leptons gauged U(1)_(Lμ-Lτ) muon collider lepton number violation

Clathrate structure of YB_(3)C_(3) for high-performance thermoelectrics with superior mechanical properties

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 Materiomics 2024年第4期10卷 783-791页

作者： Yangfan Cui Shuai Duan Xiaojun Wang Qinghang Tang Jinyang Xi Xiaobing Liu Yongsheng Zhang Xin Chen Laboratory of High Pressure physics and Material Science(HPPMS) School of Physics and Physical EngineeringQufu Normal UniversityQufuShandong273165China Materials Genome Institute Shanghai UniversityShanghai200444China Advanced Research Institute of Multidisciplinary Science Qufu Normal UniversityQufuShandong273165China

Exploring high-performance thermoelectric materials with improved mechanical properties is important for broadening the application scope and the assembly requirement of stable *** work presents an effective strategy to discover hard thermoelectric material by inserting foreign atoms in the rigid covalent *** demonstrate this in boron-carbon clathrate VII structure,showing a promising candidate for highly efficient thermoelectric energy conversion,especially with Y atom filled in the cage,with a peak zT of 0.73 at 1,000 *** ab initio calculations indicate that YB_(3)C_(3) system has low lattice thermal conductivity of 4.5 W/(m·K)at 1,000 K due to the strong rattling of encaged Y *** strongly covalent framework provides highly degenerate band structures consisting of heavy and light electron pockets,which can maintain high carrier mobility arising from small effective mass and thus large group ***,high power factor can be achieved in YB_(3)C_(3) for both electron and hole *** addition,it exhibits well mechanical properties and a Vickers hardness of 23.7 GPa because of the strong covalent boron-carbon *** work provides a novel avenue for the search of high-performance thermoelectric materials with excellent mechanical properties,based on boron-carbon clathrate structure.

关键词： Clathrate structure Thermoelectric performance First-principles calculations Mechanical properties Thermal conductivity

Influence of High-Pressure Induced Lattice Dislocations and Distortions on Thermoelectric Performance of Pristine SnTe

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 Letters 2024年第5期41卷 61-68页

作者：郑博文陈涛孙海瑞杨曼曼杨兵超陈欣张永胜刘晓兵 Laboratory of High-Pressure physics and Materials Science School of Physics and Physical EngineeringQufu Normal UniversityQufu 273165China Advanced Research Institute of Multidisciplinary Sciences Qufu Normal UniversityQufu 273165China Key Lab of Photovoltaic and Energy Conservation Materials Institute of Solid State physics HFIPSChinese Academy of SciencesHefei 230031China university of Science and Technology of China Hefei 230026China School of Electronic engineering Huainan normal university Huainan 232038China

As a sister compound of PbTe, SnTe possesses the environmentally friendly elements. However, the pristine SnTe compounds suffer from the high carrier concentration, the large valence band offset between the L and Σpositions and high thermal conductivity. Using high-pressure and high-temperature technology, we synthesized the pristine SnTe samples at different pressures and systemically investigated their thermoelectric *** pressure induces rich microstructures, including the high-density dislocations and lattice distortions, which serve as the strong phonon scattering centers, thereby reducing the lattice thermal conductivity. For the electrical properties, pressure reduces the harmful high carrier concentration, due to the depression of Sn ***, pressure induces the valence band convergence, reducing the energy separation between the L and Σpositions. The band convergence and suppressed carrier concentration increase the Seebeck coefficient. Thus, the power factors of pressure-sintered compounds do not deteriorate significantly under the condition of decreasing electrical conductivity. Ultimately, for a pristine SnTe compound synthesized at 5 GPa, a higher ZT value of 0.51 is achieved at 750 K, representing a 140% improvement compared to the value of 0.21 obtained using SPS. Therefore, the high-pressure and high-temperature technology is demonstrated as an effectively approach to optimize thermoelectric performance.

关键词： coefficient properties positions

Differences between two methods to derive a nonlinear Schrödinger equation and their application scopes

在线全文

学校读者我要写书评

暂无评论

Chinese physics B 2024年第2期33卷 421-429页

作者：陈羽西张恒段文山 college of physics and Electronic engineering Northwest Normal UniversityLanzhou 730070China

The present paper chooses a dusty plasma as an example to numerically and analytically study the differences between two different methods of obtaining nonlinear Schrödinger equation(NLSE).The first method is to derive a Korteweg–de Vries(KdV)-type equation and then derive the NLSE from the KdV-type equation,while the second one is to directly derive the NLSE from the original *** is found that the envelope waves from the two methods have different dispersion relations,different group *** results indicate that two envelope wave solutions from two different methods are completely *** results also show that the application scope of the envelope wave obtained from the second method is wider than that of the first one,though both methods are valuable in the range of their corresponding application *** is suggested that,for other systems,both methods to derive NLSE may be correct,but their nonlinear wave solutions are different and their application scopes are also different.

关键词： dusty plasmas nonlinear waves particle-in-cell simulation

Coherence of nonlinear Bloch dynamics of Bose-Einstein condensates in deep optical lattices

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 B 2024年第4期33卷 297-303页

作者：张爱霞张薇王杰胡潇文米来来薛具奎 college of physics and Electronics engineering Northwest Normal UniversityLanzhou 730070China

Atomic interaction leads to dephasing and damping of Bloch oscillations(BOs)in optical lattices,which limits observation and applications of *** to obtain persistent BOs is particularly ***,the nonlinear Bloch dynamics of the Bose-Einstein condensate with two-body and three-body interactions in deep optical lattices is *** damping rate induced by interactions is *** damping induced by two-body interaction plays a dominant role,while the damping induced by three-body interaction is ***,when the two-body and three-body interactions satisfy a threshold,long-lived coherent BOs are ***,the Bloch dynamics with periodical modulation of linear force is *** frequencies of linear force corresponding to resonance and pseudoresonance are obtained,and rich dynamical phenomena,i.e.,stable and strong BOs,drifting and dispersion of wave packet,are *** controllable Bloch dynamics is provided with the periodic modulation of the linear force.

关键词： Bose-Einstein condensate atomic interaction Bloch oscillations

Time domain characteristic analysis of non-coupled PCNN

在线全文

学校读者我要写书评

暂无评论

Optoelectronics Letters 2024年第11期20卷 689-696页

作者： DENG Xiangyu YU Haiyue HUANG Xikai college of physics and Electronic engineering Northwest Normal University

Pulse-coupled neural network(PCNN) is a multi-parameter artificial neural network, and the characteristics of PCNN can be fully explored by analyzing different simplified networks.

关键词： A