检索结果-南通市图书馆

The role of Debye mass in the chiral crossover in a strong magnetic field

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2022年第10期74卷 68-75页

作者： Jia Zhang Xin-Jian Wen Institute of Theoretical Physics State Key Laboratory of Quantum Optics and Quantum Optics DevicesShanxi UniversityTaiyuanShanxi 030006China

In this paper,the Debye mass of quarks is investigated in the Nambu–Jona-Lasinio model at zero and nonzero chemical *** a uniform plasma,the Debye mass usually behaves as a monotonous increasing function of the temperature,the chemical potential and the magnetic *** the fixed coupling interaction G,we find that the magnetic catalysis(MC)on the occurrence of the chiral restoration could be revealed by the susceptibility of the Debye mass dmD/dT at low chemical potential and by the quantity TdmD/dT in the region of moderate ***,the inverse MC is realized under a thermomagnetic coupling constant G(B,T)by the behavior of the Debye mass at both zero and nonzero chemical potentials.

关键词： chiral restoration strong magnetic field Debye mass Nambu-Jona-Lasinio

Sub-Doppler Laser Cooling of ^(23)Na in Gray Molasses on the D_2 Line

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2018年第12期35卷 10-14页

作者：师振莲李子亮王鹏军孟增明黄良辉张靖 State key Laboratory of Quantum Optics and Quantum Optics Devices Institute of Opto-electronicsShanxi University Collaborative Innovation Center of Extreme Optics Shanxi University

We report on the efficient gray molasses cooling of sodium atoms using the D2 optical transition at 589.1 *** to the hyperfine split about 6Γ between |F’ = 2> and |F’ = 3> in the excited state 32 P3/2, this atomic transition is effective for the gray molasses cooling mechanism. Using this cooling technique, the atomic sample in F = 2 ground manifold is cooled from 700 μK to 56 μK in 3.5 ms. We observe that the loading efficiency into magnetic trap is increased due to the lower temperature and high phase space density of atomic cloud after gray molasses. This technique offers a promising route for the fast cooling of the sodium atoms in the F = 2 state.

关键词： Sub-Doppler Laser Cooling of GM

Effect of gamma irradiation on optical properties of CdSe/ZnS quantum dots embedded in PDMS

在线全文

学校读者我要写书评

暂无评论

Journal of Measurement Science and Instrumentation 2022年第1期13卷 122-126页

作者： WANG Ruirong GUO Hao TANG Jun LIU Jun LIU Jinping LIU Lishuang key Laboratory of Instrumentation Science and Dynamic Measurement (North University of China) Ministray of Education Taiyuan 030051 China Department of Electronic Engineering Taiyuan Institute of Technology Taiyuan 030008 China

The optical properties of CdSe/ZnS quantum dots(QDs)embedded in polydimethylsiloxane(PDMS)flexible materials after irradiated withγ-rays were *** an embedding matrix,PDMS exhibits the advantage of high radiation *** luminescence spectra and fluorescence lifetime of the irradiated and unirradiated samples were *** fluorescence intensity of QDs decreases with the increase of the irradiation dose according to the result of luminescence *** fluorescence intensity of the QDs decreases by 80%after irradiation with a dose of 1 kGy,but the position of the emission peak and the spectral shape of the QDs remain consistent before and after *** addition,the fluorescence lifetime of QDs is shortened after *** on the fluorescence response of QDs to the irradiation ofγ-rays and combined with flexible materials,our work provides a theoretical basis for the application of QDs as a new wearable dosimeter.

关键词： CdSe/ZnS quantum dots γirradiation polydimethylsiloxane(PDMS) dosimetry

海马神经元敲低MCU改善阿尔茨海默病小鼠学习记忆功能障碍

在线全文

学校读者我要写书评

暂无评论

生理学报 2022年第5期74卷 715-725页

作者：蔡红艳乔晶陈思茹樊卫平山西医科大学微生物学与免疫学教研室太原030001 山西医科大学细胞生理学教育部重点实验室太原030001 山西医科大学细胞生理学山西省重点实验室太原030001

阿尔茨海默病(Alzheimer’s disease,AD)是一种严重威胁老年人健康的神经退行性疾病,目前为止仍然缺乏有效的治疗方法。最新研究表明,线粒体功能紊乱是AD发展的直接原因。线粒体钙离子单向转运体(mitochondrial calcium uniporter,MCU)... 详细信息

阿尔茨海默病(Alzheimer’s disease,AD)是一种严重威胁老年人健康的神经退行性疾病,目前为止仍然缺乏有效的治疗方法。最新研究表明,线粒体功能紊乱是AD发展的直接原因。线粒体钙离子单向转运体(mitochondrial calcium uniporter,MCU)位于线粒体内膜,是线粒体Ca^(2+)摄取的主要通道。MCU表达异常可引起线粒体钙稳态失衡,最终导致线粒体功能紊乱。本研究旨在明确敲低MCU对AD海马神经元和模型小鼠学习记忆功能的影响。以慢病毒和腺相关病毒为载体转染sh RNA,分别干扰海马神经元(HT22细胞)和淀粉样前体蛋白(amyloid precursor protein,APP)/早老素1(presenilin 1,PS1)/tau AD转基因小鼠海马MCU表达,用MTS法检测HT22细胞活性,用Y迷宫和Morris水迷宫实验检测APP/PS1/tau转基因小鼠学习记忆功能障碍的变化。结果显示,MCU低表达可以逆转β淀粉样蛋白1-42(amyloid beta protein 1-42,Aβ1-42)或冈田酸(okadaic acid,OA)诱导的海马神经元活性下降;海马神经元敲低MCU能够提高APP/PS1/tau小鼠的自发交替正确率(反映空间工作记忆),缩短逃避潜伏期,增加目标象限游泳时间百分比和穿台次数(反映空间参考记忆)。以上结果提示,海马神经元敲低MCU具有抗AD作用,有望成为AD防治的一种新策略。

关键词：阿尔茨海默病线粒体功能紊乱线粒体钙稳态失衡线粒体钙离子单向转运体学习记忆功能障碍

Highly sensitive photoassociation spectroscopy of ultracold 23Na133Cs molecular long-range states below the 3S1/2+6P3/2limit

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2017年第12期26卷 236-240页

作者：刘艳艳武寄洲刘文良王晓锋王文浩马杰肖连团贾锁堂 State key Laboratory of Quantum Optics and Quantum Optics Devices Institute of Laser Spectroscopy Shanxi University Collaborative Innovation Center of Extreme Optics Shanxi University

We present high resolution photoassociation spectroscopy of ultracold23Na133Cs molecules in a long-range c~3Σ~+state below the(3 S1/2+ 6 P3/2) asymptote. We perform photoassociation spectroscopy in a dual-species magneto-optical trap(MOT) and detect the photoassociation resonances using trap-loss spectroscopy. By fitting the experimental data with the semi-classical Le Roy–Bernstein formula, we deduce the long-range molecular coefficient C6 and derive the empirical potential energy curve in the long-range region.

关键词： ultracold molecule photoassociation high-resolution spectroscopy C6 coefficient

Temperature,pressure,and humidity SAW sensor based on coplanar integrated LGS

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Microsystems & Nanoengineering 2023年第5期9卷 87-99页

作者： Xiaorui Liang Lei Zhang Qiulin Tan Wenhua Cheng Dan Hu Shuang Li Lin Jing Jijun Xiong State key Laboratory of Dynamic Measurement Technology North University of ChinaTaiyuan 030051China key Laboratory of Micro/nano Devices and Systems Ministry of EducationNorth University of ChinaTai Yuan 030051China School of Materials Science and Engineering Nanyang Technological University50 Nanyang AvenueSingapore 639798Singapore

This paper presents a surface acoustic wave(SAW)sensor based on coplanar integrated Langasite(LGS)that is fabricated using wet etching,high-temperature bonding,and ion beam etching(IBE)*** miniaturized multiparameter temperature‒pressure-humidity(TPH)sensor used the MXene@MoS2@Go(MMG)composite to widen the humidity detection range and improve the humidity sensitivity,including a fast response time(3.18 s)and recovery time(0.94 s).The TPH sensor was shown to operate steadily between 25–700°C,0–700 kPa,and 10–98%*** issues among multiple parameters in complex environments were addressed by decoupling theΔf-temperature coupling factor to improve the ***,this work can be applied to simultaneous measurements of several environmental parameters in challenging conditions.

关键词： LGS humidity sensor

Quantum degenerate Bose–Fermi atomic gas mixture of 23Na and 40K

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 2023年第2期32卷 242-249页

作者：李子亮顾正宇师振莲王鹏军张靖 State key Laboratory of Quantum Optics and Quantum Optics Devices Institute of Opto-electronicsCollaborative Innovation Center of Extreme OpticsShanxi UniversityTaiyuan 030006China

We report a compact experimental setup for producing a quantum degenerate mixture of Bose23Na and Fermi40K gases. The atoms are collected in dual dark magneto–optical traps(MOT) with species timesharing loading to reduce the light-induced loss, and then further cooled using the gray molasses technique on the D2line for23Na and D1line for40K. The microwave evaporation cooling is used to cool23Na in |F = 2, mF= 2〉 in an optically plugged magnetic trap, meanwhile,40K in |F = 9/2, mF= 9/2〉 is sympathetically cooled. Then the mixture is loaded into a large volume optical dipole trap where23Na atoms are immediately transferred to |1, 1〉 for further effective cooling to avoid the strong three-body loss between23Na atoms in |2, 2〉 and40K atoms in |9/2, 9/2〉. At the end of the evaporation in optical trap, a degenerate Fermi gas of40K with 1.9 × 10^(5) atoms at T/TF= 0.5 in the |9/2, 9/2〉 hyperfine state coexists with a Bose–Einstein condensate(BEC) of23Na with 8 × 10^(4) atoms in the |1, 1〉 hyperfine state at 300 n K. We also can produce the two species mixture with the tunable population imbalance by adjusting the 23Na magneto–optical trap loading time.

关键词： ultracold gases degenerate Bose–Fermi mixture

Rydberg electromagnetically induced transparency in^(40)K ultracold Fermi gases

在线全文

学校读者我要写书评

暂无评论

Chinese Optics Letters 2023年第10期21卷 7-12页

作者：边国旗单标黄良辉张靖 State key Laboratory of Quantum Optics and Quantum Optics Devices Institute of Opto-electronicsShanxi UniversityTaiyuan 030006China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006China

We report the measurement of the electromagnetically induced transparency(EIT)with Rydberg states in ultracold^(40)K Fermi gases,which is obtained through a two-photon process with the ladder ***–EIT lines are obtained by measuring the atomic losses instead of the transmitted probe *** on the laser frequency stabilization locking to the superstable cavity,we study the Rydberg–EIT line shapes for the 37s and 35d *** experimentally demonstrate the significant change in the Rydberg–EIT spectrum by changing the principal quantum number of the Rydberg state(n=37/52 and l=0).Moreover,the transparency peak position shift is observed,which may be induced by the interaction of the Rydberg *** work provides a platform to explore many interesting behaviors involving Rydberg states in ultracold Fermi gases.

关键词： atomic and molecular physics hyperfine structure Rydberg states

Giant saturation absorption of tungsten trioxide film prepared based on the seedless layer hydrothermal method

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2023年第3期32卷 286-290页

作者：马晓光胡芳珍陈希王艺盟郝晓剑顾敏张启明 Science and Technology on Electronic Test and Measurement Laboratory North University of ChinaTaiyuan 030051China Institute of Photonic Chips University of Shanghai for Science and TechnologyShanghai 200093China Centre for Artificial-Intelligence Nanophotonics School of Optical-Electrical and Computer EngineeringUniversity of Shanghai for Science and TechnologyShanghai 200093China

Nonlinear materials have gained wide interest as saturable absorbers and pulse compression for pulsed laser applications due to their unique optical *** work investigates the third-order nonlinear phenomenon of tungsten trioxide(WO_(3))thin *** giant nonlinear absorption and nonlinear refractive index of WO_(3)thin films were characterized by Z-scan method at 800 *** experimentally observed the giant saturable absorption(SA)and nonlinear refractive index of WO_(3)thin films prepared by the seedless layer hydrothermal method,with SA coefficient being as high as-2.59×105cm·GW^(-1).The SA coefficient is at least one order of magnitude larger than those of the conventional *** nonlinear refractive index n_(2)of WO_(3)film has been observed for the first time in recent studies and the corresponding coefficient can be up to 1.793 cm^(2)·GW^(-1).The large third-order nonlinear optical(NLO)response enables WO_(3)thin films to be promising candidates for optoelectronic and photonic applications in the near-infrared domain.

关键词： tungsten trioxide Z-scan saturable absorption