检索结果-南通市图书馆

High-order time-reversal symmetry breaking normal state

Science China(Physics,Mechanics & Astronomy) 2024年第3期67卷 136-148页

作者： Meng Zeng Lun-hui hu Hong-Ye hu Yi-Zhuang You Congjun Wu Department of Physics University of CaliforniaSan DiegoCalifornia 92093USA Department of Physics Zhejiang UniversityHangzhou 310058China New Cornerstone Science Laboratory Department of PhysicsSchoolof ScienceWestlake UniversityHangzhou 30024China Institute for Theoretical Sciences Westlake UniversityHangzhou 310024China Key Laboratory for Quantum Materials of Zhejiang Province School of ScienceWestlake UniversityHangzhou 310024China Institute of Natural Sciences Westlake Institute for Advanced StudyHangzhou 310024China

Spontaneous time-reversal symmetry breaking plays an important role in studying strongly correlated unconventional *** two superconducting gap functions with different symmetries compete,the relative phase channel(θ_(-)≡θ_(1)-θ_(2))exhibits an Ising-type Z_(2) symmetry due to the second order Josephson coupling,where θ_(1,2) are the phases of two gap *** contrast,the U(1) symmetry in the channel of θ_(+)≡(θ_(1)+θ_(2))/2 is *** phase locking,i.e.,ordering of θ_(-),can take place in the phase fluctuation regime before the onset of superconductivity,i.e.,when θ_(+) is *** θ_(-) is pinned at ±π/2,then timereversal symmetry is broken in the normal state,otherwise,if θ_(-)=0,or,π,rotational symmetry is broken,leading to a nematic normal *** both cases,the order parameters possess a 4-fermion structure beyond the scope of mean-field theory,which can be viewed as a high order symmetry *** employ an effective two-component XY-model assisted by a renormalization group analysis to address this *** a natural by-product,we also find the other interesting intermediate phase corresponds to ordering of θ_+ but with θ_(-)*** is the quartetting,or,charge-4e,superconductivity,which occurs above the low temperature Z_(2)-breaking charge-2e superconducting *** results provide useful guidance for studying novel symmetry breaking phases in strongly correlated superconductors.

关键词： superconductivity strong correlation time-reversal breaking charge-4e

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Astronomic background of global huge earthquakes at beginning of 21st century

引用

Applied Geophysics 2024年第3期21卷 423-432,616页

作者： hu hui Su You-Jin Yunnan Observatory Chinese Academy of SciencesKunming 650011China Seismological Bureau of Yunnan Province Kunming 650224China

Since the beginning of the 21st century,major earthquakes have frequently occurred *** explore the impact of astronomical factors on earthquakes,in this study,the statistical analysis method of correlation is used to systematically analyze the effects of astronomical factors,such as solar activity,Earth’s rotation,lunar declination angle,celestial tidal force,and other phenomena on M≥8 global earthquakes at the beginning of the 21st *** regard to solar activity,this study focuses on the analysis of the 11-year and century cycles of solar *** causal relationship of the Earth’s rotation is not obvious in this work and previous works;in contrast,the valley period of the solar activity century cycle may be an important astronomical factor leading to the frequent occurrence of global earthquakes at the beginning of the 21st *** topic warrants further study.

关键词： M≥8.0 earthquake astronomical factors solar activity Earth’s rotation lunar declination angle tidal force phenomena

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Construction of metal-organic frameworks with unsaturated Cu sites for efficient and fast reduction of nitroaromatics:A combined experimental and theoretical study

引用

Chinese Chemical Letters 2024年第8期35卷 514-519页

作者： Longlong Geng huiling Liu Wenfeng Zhou Yong-Zheng Zhang Hongliang huang Da-Shuai Zhang hui hu Chao Lv Xiuling Zhang Suijun Liu Shandong Provincial Key Laboratory of Monocrystalline Silicon Semiconductor Materials and Technology College of Chemistry and Chemical EngineeringDezhou UniversityDezhou 253023China School of Chemistry and Chemical Engineering Shandong University of TechnologyZibo 255000China State Key Laboratory of Separation Membranes and Membrane Processes School of Chemical Engineering and TechnologyTiangong UniversityTianjin 300387China School of Chemistry and Chemical Engineering Jiangxi Provincial Key Laboratory of Functional Molecular Materials ChemistryJiangxi University of Science and TechnologyGanzhou 341000China

Metal-organic frameworks(MOFs)functionalized with open metal sites(OMSs)have received widespread attention in various applications due to their fascinating electronic properties and unique interactions with guest ***,rational tailoring of the coordination environment of metal nodes dur-ing the synthesis of MOFs remains a great challenge due to their tendency of saturated coordination with ***,we reported the construction of three new MOFs featuring unsaturated Cu(Ⅱ)sites,namely[Cu(HCOO)(pzta)]_(n)(HL-1),{[Cu(PTA)0.5(pzta)(H_(2)O)]·2H_(2)O}_(n)(HL-2)and[Cu(NA)0.5(pzta)]_(n)(HL-3)(Hpzta=3-pyrazinyl-1,2,4-triazole;PTA=terephthalic acid;NA=1,4-naphthalene dicarboxylic acid),based on the mixed-linker strategy via specific selection of versatile Hpzta ligand and carboxylate ***-markably,the obtained MOFs exhibited excellent activity and good recyclability for the catalytic reduction of nitroaromatics under mild conditions(25℃and 1 atm).In particular,the complete conversion of 4-nitrophenol(4-NP)took only 30 s on HL-2,reaching a record-high TOF value compared with previously reported metal *** combined experimental and theoretical studies on HL-2 revealed that the open Cu site with positive-charged nature could improve the adsorption and subsequent electron trans-port between the substrates,and was responsible for the outstanding *** work shined lights on the further enhancement of performance for MOFs through rational OMSs construction.

关键词： Metal-organic frameworks Open metal sites Catalysis Copper node 4-Nitrophenol

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Efficacy of acupuncture in refractory irritable bowel syndrome patients:a randomized controlled trial

引用

Frontiers of Medicine 2024年第4期18卷 678-689页

作者： Jun Zhao hui Zheng Xin Wang Xuefei Wang Yunzhou Shi Chaorong Xie Qingfeng Tao Da Li Jingwen Sun Junjian Tian Junxia Gao huimin Liu Suhua Shi Jinxia Ni Rongdan Xue hui hu Min Chen Shuguang Yu Zhigang Li School of Acupuncture-Moxibustion and Tuina Beijing University of Chinese MedicineBeijing100029China The Third Hospital/Acupuncture and Tuina School Chengdu University of Traditional Chinese MedicineChengdu610000China Beijing Hospital of Traditional Chinese Medicine Capital Medical UniversityBeijing100010China Department of Acupuncture and Moxibustion Dongzhimen Hospital Affiliated to Beijing University of Chinese MedicineBeijing100700China Department of Rehabilitation The Third Affiliated Hospital of Beijing University of Chinese MedicineBeijing100029China Department of Acupuncture and Moxibustion Dongfang Hospital Affiliated with Beijing University of Chinese MedicineBeijing100078China Anorectal Disease Department Hospital of Chengdu University of Traditional Chinese MedicineChengdu610075China Department of Integrated Traditional and Western Medicine West China HospitalSichuan UniversityChengdu610044China

Previous studies have confirmed that acupuncture for irritable bowel syndrome(IBS)provided an additional benefit over usual care ***,we performed a multicenter,randomized,sham-controlled trial to assess the efficacy and safety of acupuncture versus sham acupuncture for refractory IBS in patients in the context of conventional *** in the acupuncture and sham acupuncture groups received real or sham acupuncture treatment in 3 sessions per week for a total of 12 *** primary outcome was a change in the IBS–Symptom Severity Scale(IBS-SSS)score from baseline to week 4.A total of 521 participants were screened,and 170 patients(85 patients per group)were enrolled and included in the intention-to-treat *** characteristics were comparable across the two *** baseline to 4 weeks,the IBS-SSS total score decreased by 140.0(95%CI:126.0 to 153.9)in the acupuncture group and 64.4(95%CI:50.4 to 78.3)in the sham acupuncture *** between-group difference was 75.6(95%CI:55.8 to 95.4).Acupuncture efficacy was maintained during the 4-week follow-up *** were no serious adverse *** conclusion,acupuncture provided benefits when combined with treatment as usual,providing more options for the treatment of refractory IBS.

关键词： acupuncture functional gastrointestinal disorders irritable bowel syndrome clinical trial

来源：

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

Synthesis of highly stable Ni nanoparticles via electrostatic self-assembly for enhanced hydrogen storage of MgH_(2)

引用

Rare Metals 2024年第9期43卷 4356-4366页

作者： Qin-Ke Tang Jiang-Chuan Liu Rui Shi Yun-Feng Zhu Ji-Guang Zhang Ya-Na Liu Jun Wang Yao Zhang Xiao-hui hu Zhi-Bin Liu Li-Quan Li College of Materials Science and Engineering Jiangsu Collaborative Innovation Centre for Advanced Inorganic Function CompositesNanjing Tech UniversityNanjing 211816China School of Materials Science and Engineering Southeast UniversityNanjing 211189China

Magnesium-based hydrides have been widely recognized as an appropriate choice for solid-state hydrogen ***,its undesirable thermodynamics and sluggish hydrogenation/dehydrogenation kinetics are major bottlenecks for its ***,a highly stable and highly dispersed Ni-based catalyst(Ni/Al_(2)O_(3)/GN)was fabricated to promote the hydrogen storage performance of MgH_(2)via the electrostatic effect of NiAl-LDH/GN precursor with a co-calcination reduction ***_(2)-5wt%Ni/Al_(2)O_(3)/GN exhibits excellent hydrogen storage performance,releasing about 5.7 wt%hydrogen in 3500 s at 250℃,and can reach a saturation hydrogen absorption of about 6.15 wt%in 3000 s at 100℃.Furthermore,it also shows low dehydrogenation apparent activation energy of 89.1 and 118.2 kJ·mol^(-1).Impressively,the catalyst ensures the stability of both the physical phase and structure during ball milling and cycling *** role of each phase in Ni/Al_(2)O_(3)/GN on the hydrogen storage performance of MgH_(2)was also discussed through experiments and theoretical calculation,and the synergistic catalytic mechanism of Ni/Al_(2)O_(3)/GN was clearly *** work provides a unique perspective for the preparation of highly stable and highly dispersible catalysts.

关键词： Magnesium hydride Ni/Al_(2)O_(3)/GN Hydrogen storage performance Catalytic mechanism

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

基于LWN-Net的印刷电路板缺陷检测算法

引用

计算机集成制造系统 2024年第2期30卷 496-507页

作者：文斌胡晖杨超三峡大学电气与新能源学院湖北宜昌443002

针对现阶段印刷电路板缺陷检测任务中网络精度低、速度慢、模型参数量大的问题,提出基于改进YOLOv3的轻量级权重新型网络(LWN-Net),并提出轻量级特征增强网络作为模型的特征提取网络,解决YOLOv3中主干网络Darknet53参数量过多的问题。... 详细信息

针对现阶段印刷电路板缺陷检测任务中网络精度低、速度慢、模型参数量大的问题,提出基于改进YOLOv3的轻量级权重新型网络(LWN-Net),并提出轻量级特征增强网络作为模型的特征提取网络,解决YOLOv3中主干网络Darknet53参数量过多的问题。考虑到特征提取过程中语义信息和位置信息不平衡会导致检测精度降低,构建权重聚合分配机制消除不平衡,以提高模型特征提取能力。提出新型特征金字塔网络,增强网络对细节信息的提取能力并降低信息冗余度。采用回归损失函数SIoU加快模型的收敛速度并提高检测精度。结果表明,相比YOLOv3,LWN-Net网络的模型规模压缩了87.5%,而检测速度提升了8.32帧·s^(-1),预测精度和召回率分别提升了0.88%和1.6%。该网络的提出为印刷电路板的缺陷检测问题提供了一种更高效的方法。

关键词： PCB缺陷检测 YOLOv3 轻量级 SIoU损失函数

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Effect of Chinese Medicine in Patients with COVID-19: A Multi-center Retrospective Cohort Study

引用

Chinese Journal of Integrative Medicine 2024年第11期30卷 974-983页

作者： ZHAO Guo-zhen YAN Shi-yan LI Bo GUO Yu-hong SONG Shuang hu Ya-hui GUO Shi-qi hu Jing DU Yuan LU Hai-tian YE Hao-ran REN Zhi-ying Zhu Ling-fei XU Xiao-long SU Rui LIU Qing-quan Beijing Hospital of Traditional Chinese Medicine Capital Medical University Beijing Institute of Traditional Chinese Medicine School of Clinical Medicine Beijing University of Chinese Medicine School of Acupuncture-Moxibustion and Tuina Beijing University of Chinese Medicine College of Integrated Chinese Medicine Tianjin University of Traditional Chinese Medicine

Objective: To evaluate the effectiveness and safety of Chinese medicine(CM) in the treatment of coronavirus disease 2019(COVID-19) in China. Methods: A multi-center retrospective cohort study was carried out, with cumulative CM treatment period of 3 days during hospitalization as exposure. Data came from consecutive inpatients from December 19, 2019 to May 16, 2020 in 4 medical centers in Wuhan, China. After data extraction, verification and cleaning, confounding factors were adjusted by inverse probability of treatment weighting(IPTW), and the Cox proportional hazards regression model was used for statistical analysis. Results:A total of 2,272 COVID-19 patients were included. There were 1,684 patients in the CM group and 588 patients in the control group. Compared with the control group, the hazard ratio(HR) for the deterioration rate in the CM group was 0.52 [95% confidence interval(CI): 0.41 to 0.64, P<0.001]. The results were consistent across patients of varying severity at admission, and the robustness of the results were confirmed by 3 sensitivity analyses. In addition, the HR for all-cause mortality in the CM group was 0.29(95% CI: 0.19 to 0.44, P<0.001).Regarding of safety, the proportion of patients with abnormal liver function or renal function in the CM group was smaller. Conclusion: This real-world study indicates that the combination of a full-course CM therapy on the basic conventional treatment, may safely reduce the deterioration rate and all-cause mortality of COVID-19patients. This result can provide the new evidence to support the current treatment of COVID-19. Additional prospective clinical trial is needed to evaluate the efficacy and safety of specific CM interventions.(Registration No. ChiCTR2200062917)

关键词： Chinese medicine all-cause mortality cohort study coronavirus disease 2019 deterioration rate

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

蔡和森思想转变问题再探——以留法勤工俭学运动为考察中心

引用

湘潭大学学报（哲学社会科学版） 2024年第5期48卷 114-120,128页

作者：胡慧娥湖南第一师范学院马克思主义学院湖南长沙410205

蔡和森是中国共产党早期卓越的领导人,在参与组织湖南留法勤工俭学运动前有诸多救国主张的探索,后筹划这一运动及亲至北京做先期联络工作时,其思想发生了较大转变,开始接触马克思列宁学说,进而服膺并宣传马克思主义。赴法国后他“猛看... 详细信息

蔡和森是中国共产党早期卓越的领导人,在参与组织湖南留法勤工俭学运动前有诸多救国主张的探索,后筹划这一运动及亲至北京做先期联络工作时,其思想发生了较大转变,开始接触马克思列宁学说,进而服膺并宣传马克思主义。赴法国后他“猛看猛译”马克思列宁著作,考察西方社会现状,指导开展大规模抗争运动,成为坚定的马克思主义者。蔡和森思想的转变影响了不少留法学生与新民学会会员,其转变原因则与湖湘文化的熏染、杨昌济的帮助、自身对社会问题的反思以及李大钊、陈独秀的指引有关。

关键词：蔡和森留法勤工俭学运动思想转变

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

强记汤通过激活AMPKα/SIRT1/PGC-1α信号通路减轻D-半乳糖诱导的认知损伤和线粒体功能障碍

引用

中国病理生理杂志 2024年第10期40卷 1906-1915页

作者：何丽玲胡慧湖北民族大学医学部湖北恩施445000 湖北中医药大学护理学院湖北武汉430065

目的:探讨强记汤对D-半乳糖诱导的线粒体功能障碍的作用及其机制。方法:80只C57BL/6小鼠被随机分配至空白组、模型组、二甲双胍组和强记汤组。对空白组以外的其他3组小鼠背颈部皮下注射D-半乳糖(100 mg·kg^(-1)·d^(-1)),连续8周,以建... 详细信息

目的:探讨强记汤对D-半乳糖诱导的线粒体功能障碍的作用及其机制。方法:80只C57BL/6小鼠被随机分配至空白组、模型组、二甲双胍组和强记汤组。对空白组以外的其他3组小鼠背颈部皮下注射D-半乳糖(100 mg·kg^(-1)·d^(-1)),连续8周,以建立衰老相关的认知损伤模型。强记汤组给予强记汤水煎液(24.96 g·kg^(-1)·d^(-1))灌胃,二甲双胍组给予二甲双胍(0.2 g·kg^(-1)·d^(-1))灌胃,空白组和模型组灌胃等体积生理盐水(20 mL·kg^(-1)·d^(-1)),连续灌胃4周,每天1次。Morris水迷宫实验和新物体识别实验评估小鼠的学习记忆力;Fluoro-Jade B(FJB)染色观察海马区受损的神经元;透射电镜观察海马区线粒体的超微结构;试剂盒检测活性氧(ROS)水平;JC-1染色检测海马神经细胞线粒体膜电位水平;试剂盒检测海马组织线粒体ATP及线粒体呼吸链复合体Ⅰ、Ⅲ、Ⅳ含量;Western blot检测海马组织中AMP活化蛋白激酶α(AMPKα)、第172位苏氨酸磷酸化的AMPKα(p-AMPKα-Thr172)、沉默信息调节因子1(SIRT1)、过氧化物酶体增殖物受体γ辅激活因子1α(PGC-1α)、核呼吸因子1(NRF1)、NRF2和线粒体转录因子A(TFAM)水平。结果:Morris水迷宫实验和新物体识别实验结果显示,与模型组比较,二甲双胍组和强记汤组小鼠逃避潜伏期显著缩短(P<0.05或P<0.01),穿越平台次数、目标象限驻留时间及新物体识别指数显著增加(P<0.05或P<0.01)。FJB染色结果显示,与模型组比较,二甲双胍组和强记汤组小鼠海马CA1和CA3区FJB标记的神经元数量显著减少(P<0.05或P<0.01)。透射电镜显示,与模型组比较,二甲双胍组和强记汤组小鼠海马神经细胞中线粒体损伤减轻,且线粒体的长度和面积显著增加(P<0.05或P<0.01)。与模型组比较,二甲双胍组和强记汤组小鼠海马神经细胞中ROS水平显著降低(P<0.05或P<0.01)。JC-1染色结果显示,与模型组比较,二甲双胍组和强记汤组小鼠海马神经细胞线粒体膜电位显著升高(P<0.05或P<0.01)。与模型组比较,二甲双胍组和强记汤组小鼠海马组织线粒体ATP及线粒体呼吸链复合体Ⅰ、Ⅲ、Ⅳ水平显著升高(P<0.05或P<0.01)。Western blot结果显示,与模型组比较,二甲双胍组和强记汤组小鼠海马p-AMPKα-Thr172、SIRT1、PGC-1α、NRF1、NRF2和TFAM水平显著升高(P<0.05或P<0.01)。结论:强记汤可通过激活AMPKα/SIRT1/PGC-1α信号通路减轻D-半乳糖诱导的认知障碍、神经元损伤及线粒体功能障碍。

关键词：强记汤衰老认知线粒体 AMPKα/SIRT1/PGC-1α信号通路

来源：

维普期刊数据库博看期刊

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Fiber optic high temperature sensor with weak strain sensitivity based on Mach-Zehnder interferometric structure

引用

Optoelectronics Letters 2024年

作者： LIU Ming MA Chengju ZHANG Yixin LIU Qianzhen hu hui WU Jirui School of Science， Xi'an Shiyou University

We proposed a fiber optic high temperature sensor based on the Mach-Zehnder (M-Z) interference structure， which is composed of two lengths of multi-mode fiber (MMF)， a length of few-mode fiber (FMF) and two sections of single-mode fiber (SMF). Firstly， the two sections of MMF were spliced with two sections of SMF. Then， the MMFs were fused to two ends of FMF to form a symmetrically structured fiber-optic M-Z interferometric structure. In this structure， the multimode fiber served as the optical mode field coupling element， and the cladding and core of the FMF are the interference arm and the reference arm of the M-Z interference structure， respectively. We investigated the sensor’s response characteristics of the temperature and strain. The experimental results indicate that the sensor is sensitive to temperature variation， and the temperature response sensitivity is up to 61.4 pm/℃ in the range of 40 ～ 250 ℃， while the sensor has weak strain sensitivity， its strain sensitivity is only -0.72 pm/με in the strain range of 0 με to 1400 με，. Moreover， the sensor has good stability and repeatability. In brief， the fiber optic high temperature sensor proposed by us has good properties， such as high sensitivity， compact structure， good stability and repeatability， it can be used for monitoring the temperature of submerged oil electric pump units under oil wells.

关键词：

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：