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Structure and superconducting properties of Ru_(1-x)Mo_(x)(x=0.1-0.9)alloys

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Chinese Physics B 2024年第4期33卷 173-179页

作者：付阳龚春生涂志俊田尚杰王守国雷和畅 Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials&Micro-nano Devices Renmin University of ChinaBeijing 100872China Key Laboratory of Quantum State Construction and Manipulation Renmin University of ChinaBeijing 100872China Anhui Key Laboratory of Magnetic Functional Materials and Devices School of Materials Science and EngineeringAnhui UniversityHefei 230601China

We report the detailed crystal structures and physical properties of Ru_(1-x)Mo_(x)alloys in the solid solution range of x=*** characterizations indicate that the crystal structure changes from the hcp-Mg-type,toβ-CrFe-type,and then *** measurements of physical properties show that the Ru_(1-x)Mo_(x)samples with x≥0.2are superconductors and the superconducting transition temperature T_c as a function of Mo content exhibits a dome-like behavior.

关键词： superconductivity alloy crystal structures Ru_(1-x)Mo_(x)

面向河道治理工程质量评价的模糊综合评判法研究

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水利科学与寒区工程 2024年第2期7卷 45-49页

作者：涂志俊湖北路达胜工程技术咨询有限公司湖北武汉430015

研究利用模糊综合评判法(FAHP)对多个指标进行综合考虑分析,在此基础上建立模糊评价模型,对河道工程质量进行评价分析。试验显示,FAHP评价模型准确度高于AGA-BP评价模型7.11%,将FAHP评价模型运用到实际的河道工程中,研究评价结果与工程... 详细信息

研究利用模糊综合评判法(FAHP)对多个指标进行综合考虑分析,在此基础上建立模糊评价模型,对河道工程质量进行评价分析。试验显示,FAHP评价模型准确度高于AGA-BP评价模型7.11%,将FAHP评价模型运用到实际的河道工程中,研究评价结果与工程实际评价结果一致,准确度高。因此FAHP评价模型在河道治理工程上有一定的应用价值。

关键词：模糊综合评判法河道治理质量评价评价模型

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引水渠道口泥沙淤积影响研究

水利技术监督 2024年第1期 230-234页

作者：何佩诗涂志俊湖北志宏水利水电设计有限公司湖北武汉430070 湖北路达胜工程技术咨询有限公司湖北武汉430015

引水渠道口泥沙淤积影响渠道输水效率。为了解决引水渠道口泥沙淤积问题,文章通过一维非恒定流水沙数学模型对引水渠道口泥沙淤积规律进行分析。结果表明:渠道进水口0.125~0.25km范围内泥沙淤积厚度最大,糙率系数、水沙强度及时间与渠... 详细信息

引水渠道口泥沙淤积影响渠道输水效率。为了解决引水渠道口泥沙淤积问题,文章通过一维非恒定流水沙数学模型对引水渠道口泥沙淤积规律进行分析。结果表明:渠道进水口0.125~0.25km范围内泥沙淤积厚度最大,糙率系数、水沙强度及时间与渠道内泥沙淤积厚度成正相关关系。研究结果为引水渠道防沙工程提供参考。

关键词：引水渠道糙率系数淤积厚度水沙强度

Structures and Physical Properties of V-Based Kagome Metals CsV_(6)Sb_(6)and Cs V_(8)Sb_(12)

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Chinese Physics Letters 2021年第12期38卷 62-68页

作者： Qiangwei Yin zhijun tu Chunsheng Gong Shangjie Tian Hechang Lei Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials&Micro-nano Devices Renmin University of ChinaBeijing 100872China

We report two new members of V-based kagome metals CSV_(6)Sb_(6)and CsV_(8)Sb_(12).The most striking structural feature of CSV_(6)Sb_(6)is the V kagome *** CsV_(8)Sb_(12),there is an intergrowth of two-dimensional V kagome layers and one-dimensional V chains,and the latter ones lead to the orthorhombic symmetry of this *** measurements indicate that these two materials exhibit metallic and Pauli paramagnetic *** importantly,different from CSV_(3) Sb_(5),the charge density wave state and superconductivity do not emerge in CSV_(6)Sb_(6)and CsV_(8)Sb_(12)when temperature is above 2 *** magnetoresistance with saturation behavior and linear field dependence of Hall resistivity at high field and low temperature suggest that the carriers in both materials should be uncompensated with much different *** discovery of these two new V-based kagome metals sheds light on the exploration of correlated topological materials based on kagome lattice.

关键词： resistivity striking

Superconductivity and Normal-State Properties of Kagome Metal RbV_(3)Sb_(5) Single Crystals

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Chinese Physics Letters 2021年第3期38卷 95-100页

作者： Qiangwei Yin zhijun tu Chunsheng Gong Yang Fu Shaohua Yan Hechang Lei Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials&Micro-nano Devices Renmin University of ChinaBeijing 100872China

We report the discovery of superconductivity and detailed normal-state physical properties of RbV_(3)Sb_(5) single crystals with V kagome ***_(3)Sb_(5) single crystals show a superconducting transition at Tc~0.92 ***,resistivity,magnetization and heat capacity measurements indicate that it exhibits anomalies of properties at T*~102-103 K,possibly related to the formation of charge ordering *** T is lower than T*,the Hall coefficient RH undergoes a drastic change and sign reversal from negative to positive,which can be partially explained by the enhanced mobility of hole-type *** addition,the results of quantum oscillations show that there are some very small Fermi surfaces with low effective mass,consistent with the existence of multiple highly dispersive Dirac band near the Fermi energy level.

关键词： state. Fermi magnetization

Superconductivity in Kagome Metal YRu_(3)Si_(2)with Strong Electron Correlations

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Chinese Physics Letters 2022年第8期39卷 59-64页

作者： Chunsheng Gong Shangjie Tian zhijun tu Qiangwei Yin Yang Fu Ruitao Luo Hechang Lei Laboratory for Neutron Scattering and Beijing Key Laboratory of Optoelectronic Functional Materials&MicroNano DevicesDepartment of PhysicsRenmin University of ChinaBeijing 100872China

We report the detailed physical properties of YRu_(3)Si_(2)with the Ru kagome lattice at normal and superconducting *** results of resistivity and magnetization show that YRu_(3)Si_(2)is a type-II bulk superconductor with T_(c)~3.0 *** specific heat measurement further suggests that this superconductivity could originate from the weak or moderate electron-phonon *** the other hand,both large Kadawaki–Woods ratio and Wilson ratio indicate that there is a strong electron correlation effect in this system,which may have a connection with the featured flat band of kagome lattice.

关键词： Strong (3) Electron

S-Wave Superconductivity in Kagome Metal CsV_(3)Sb_(5) Revealed by ^(121/123)Sb NQR and ^(51)V NMR Measurements

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Chinese Physics Letters 2021年第7期38卷 140-144页

作者： Chao Mu Qiangwei Yin zhijun tu Chunsheng Gong Hechang Lei Zheng Li Jianlin Luo Beijing National Laboratory for Condensed Matter Physics and Institute of Physics Chinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100190China Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials&Micro-nano Devices Renmin University of ChinaBeijing 100872China Songshan Lake Materials Laboratory Dongguan 523808China

We report ^(121/123)Sb nuclear quadrupole resonance(NQR)and ^(51)V nuclear magnetic resonance(NMR)measurements on kagome metal CsV_(3)Sb_(5) with T_(c)=2.5 *** ^(51)V NMR spectra and ^(121/123)Sb NQR spectra split after a charge density wave(CDW)transition,which demonstrates a commensurate CDW *** coexistence of the high temperature phase and the CDW phase between 91 K and 94 K manifests that it is a first-order phase *** low temperature,electric-field-gradient fluctuations diminish and magnetic fluctuations become *** emerges in the charge order *** shift decreases and 1/T_(1)T shows a Hebel–Slichter coherence peak just below T_(c),indicating that CsV_(3)Sb_(5) is an s-wave superconductor.

关键词： transition state NMR

Tri-hexagonal charge order in kagome metal CsV_(3)Sb_(5) revealed by (121)Sb nuclear quadrupole resonance

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Chinese Physics B 2022年第1期31卷 10-14页

作者： Chao Mu Qiangwei Yin zhijun tu Chunsheng Gong Ping Zheng Hechang Lei Zheng Li Jianlin Luo Beijing National Laboratory for Condensed Matter Physics and Institute of Physics Chinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100190China Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials&Micro-nano Devices Renmin University of ChinaBeijing 100872China Songshan Lake Materials Laboratory Dongguan 523808China

We report ^(121)Sb nuclear quadrupole resonance(NQR)measurements on kagome superconductor CsV_(3)Sb_(5) with Tc=2.5 K.^(121)Sb NQR spectra split after a charge density wave(CDW)transition at 94 K,which demonstrates a commensurate CDW *** coexistence of the high temperature phase and the CDW phase between 91 K and 94 K manifests that it is a first order phase *** CDW order exhibits tri-hexagonal deformation with a lateral shift between the adjacent kagome layers,which is consistent with 2×2×2 superlattice *** superconducting state coexists with CDW order and shows a conventional s-wave behavior in the bulk state.

关键词： charge-density-wave systems nuclear magnetic resonance

地下工程内人体对CO_(2)浓度的生理响应试验研究

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中国安全科学学报 2020年第12期30卷 173-179页

作者：涂志军耿世彬李永陆军工程大学国防工程学院江苏南京210007

为预防高CO_(2)体积分数(即浓度)损伤人员机体,保障地下人员安全,基于人体隔绝试验,分析地下人员对CO_(2)体积分数的生理响应特征。在苏州某地下人防工程中,对170名受试者进行12 h密闭隔绝现场试验,监测不同CO_(2)体积分数下(0.1%~1%),... 详细信息

为预防高CO_(2)体积分数(即浓度)损伤人员机体,保障地下人员安全,基于人体隔绝试验,分析地下人员对CO_(2)体积分数的生理响应特征。在苏州某地下人防工程中,对170名受试者进行12 h密闭隔绝现场试验,监测不同CO_(2)体积分数下(0.1%~1%),人员心率、血压、血氧饱和浓度、心电(ECG)、皮肤电和静态脑电变化特性,分析心率变异性(HRV)及皮电反应。研究结果表明:短期暴露在CO_(2)体积分数不高于0.7%的环境中不会引起人体显著的生理响应;CO_(2)体积分数上升至0.85%时,受试者心率和HRV显著降低,HRV低频功率(LF)及高频功率(HF)、HRV中快速变化成分和舒张压显著升高;CO_(2)体积分数达到1%时,受试者皮肤电导及皮电水平显著降低;此外,CO_(2)体积分数升高,受试者α波节律被抑制,β波及KC复杂度增加。

关键词：地下工程 CO_(2)体积分数生理响应隔绝试验心率变异性(HRV)