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Reduction in thermal conductivity of monolayer WS_(2) caused by substrate effect

Nano Research 2022年第10期15卷 9578-9587页

作者： Yufeng Zhang Qian Lv Aoran fan lingxiao Yu Haidong Wang Weigang Ma Ruitao Lv Xing Zhang Key Laboratory for Thermal Science and Power Engineering of Ministry of Education Department of Engineering MechanicsTsinghua UniversityBeijing 100084China State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China Key Laboratory of Advanced Materials(MOE) School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China

Understanding the substrate and temperature effect on thermal transport properties of transition metal dichalcogenides(TMDs)monolayers are crucial for their future applications.Herein,a dual-wavelength flash Raman(DF-Raman)method is used to measure the thermal conductivity of monolayer WS_(2) at a temperature range of 200–400 K.High measurement accuracy can be guaranteed in this method since the influence of both the laser absorption coefficient and temperature-Raman coefficient can be eliminated through normalization.The room-temperature thermal conductivity of suspended and supported WS_(2) are 28.5±2.1(30.3±2.0)and 15.4±1.9(16.9±2.1)W/(m·K),respectively,with a~50%reduction due to substrate effect.Molecular dynamics(MD)simulations reveal that the suppression of acoustic phonons is mainly responsible for the striking reduction.The behaviors of optical phonons are also unambiguously investigated using Raman spectroscopy,and the in-plane optical mode,E(Γ),is surprisingly found to be slightly enhanced while out-of-plane mode,A1g(Γ),is suppressed due to substrate interaction,mutually verified with MD results.Our study provides a solid understanding of the phonon transport behavior of WS_(2) with substrate interaction,which provides guidance for TMDs-based nanodevices.

关键词： monolayer WS_(2),thermal conductivity,substrate effect,temperature effect,dual-wavelength flash Raman(DF-Raman)method

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Geological characteristics and models of fault-foldfracture body in deep tight sandstone of the second member of Upper Triassic Xujiahe Formation in Xinchang structural belt of Sichuan Basin,SW China

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Petroleum Exploration and Development 2023年第3期50卷 603-614页

作者： LIU Junlong LIU Zhongqun LIU Zhenfeng LIU Yali SHEN Baojian XIAO Kaihua BI Youyi WANG Xiaowen WANG Ail FAN Lingxiao LI Jitongl Sinopec Petroleum Exploration&Production Research Institute Beijing 100083China Sinopec Southwest Oil&Gas Company Chengdu 610081China

In the second member of the Upper Triassic Xujiahe Formation(T_(3)x_(2))in the Xinchang area,western Sichuan Basin,only a low percent of reserves has been recovered,and the geological model of gas reservoir sweet spot remains unclear.Based on a large number of core,field outcrop,test and logging-seismic data,the T_(3)x_(2) gas reservoir in the Xinchang area is examined.The concept of fault-fold-fracture body(FFFB)is proposed,and its types are recognized.The main factors controlling fracture development are identified,and the geological models of FFFB are established.FFFB refers to faults,folds and associated fractures reservoirs.According to the characteristics and genesis,FFFBs can be divided into three types:fault-fracture body,fold-fracture body,and fault-fold body.In the hanging wall of the fault,the closer to the fault,the more developed the effective fractures;the greater the fold amplitude and the closer to the fold hinge plane,the more developed the effective fractures.Two types of geological models of FFFB are established:fault-fold fracture,and matrix storage and permeability.The former can be divided into two subtypes:network fracture,and single structural fracture,and the later can be divided into three subtypes:bedding fracture,low permeability pore,and extremely low permeability pore.The process for evaluating favorable FFFB zones was formed to define favorable development targets and support the well deployment for purpose of high production.The study results provide a reference for the exploration and development of deep tight sandstone oil and gas reservoirs in China.

关键词： fault-fold-fracture body fracture control factor genetic characteristics geological model deep layer tight sandstone Xinchang structural belt Upper Triassic Xujiahe Formation Sichuan Basin

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Application of contrast-enhanced ultrasound in minimally invasive ablation of benign thyroid nodules

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Journal of Interventional Medicine 2022年第1期5卷 32-36页

作者： Jiaying Cao Peili fan Feihang Wang Shuainan Shi lingxiao Liu Zhiping Yan Yi Dong Wenping Wang Department of Ultrasound Zhongshan HospitalFudan UniversityShanghaiChina Department of Interventional Radiology Zhongshan HospitalFudan UniversityShanghaiChina Shanghai Institute of Medical Imaging ShanghaiChina

Objective:This study aimed to investigate the application value of contrast-enhanced ultrasound(CEUS)before and after minimally invasive ablation procedures for benign thyroid nodule(s)(BTN).Methods:This prospective study included patients with BTNs scheduled to undergo ultrasound-guided minimally invasive ablation treatment.CEUS was performed before and after ablation(at 1 day,and 1,6,and 12 months after ablation).Changes in microvascular perfusion and the volume of BTNs were noted and assessed.Results:Sixty-two patients(62 BTNs),who underwent ablation procedures between June 2016 and August 2020,were included.All lesions were confirmed by biopsy,and histopathological results were obtained before ablation treatment.On preoperative CEUS,the lesions exhibited hyperenhancement(53.23%)or iso-enhancement(46.77%)during the arterial phase,and all lesions exhibited iso-enhancement in the venous and late phases.One day after ablation,none of the BTNs exhibited obvious enhancement on CEUS.One(1.61%)lesion was retreated due to a nodule-like enhancement area detected by CEUS at the 6-month follow-up.The mean nodular volume reduction rate(VRR)at 1,6,and 12 months follow-up demonstrated no significant difference between the two ablation groups(microwave ablation versus radiofrequency ablation).Twelve months after ablation,the mean(±SD)VRR of all BTNs was 60.3±10.3%.Conclusion:CEUS helped guide treatment decisions for BTNs before ablation treatment.Moreover,it could also be used to accurately and noninvasively evaluate treatment efficacy.

关键词： Ultrasound Contrast agent Thyroid Microwave ablation Radiofrequency ablation

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Prediction of rock-burst-threatened areas in an island coal face and its prevention:A case study

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International Journal of Mining Science and Technology 2016年第6期26卷 1125-1133页

作者： Li Xuehua Pan fan Li Huaizhen Zhao Min Ding lingxiao Zhang Wenxi School of Mines China University of Mining and Technology State Key Laboratory of Deep Coal Resource Mining China University of Mining and TechnologyXuzhou School of Energy Science and Engineering Henan Polytechnic University

The island coal face arises in coal mines with the purpose of preventing gas explosion or maintaining the balance between mining and tunneling. However, its particular stress conditions in the surrounding rock may increase the difficulty of stress control in the coal face and in its mining roadways, especially when the coal seam, the roof, and the floor have rock-burst propensities. The high energy accumulated in the island coal face and in its roof and floor will intensify rock-burst propensity or even induce rock burst,which further result in great casualties and financial losses. Taking island coal face 2321 in Jinqiao coal mine as a case, we propose a method for the prediction of rock-burst-threatened areas in an island coal face with weak rock-burst propensity. Based on the analysis of the movement of the overlying roof and characteristics of stress distribution, this method combined numerical simulation with drilling bits to ensure the prediction accuracy. The effects of coal pillars with different widths on the mitigation of stress concentration in the coal face and on the prevention of rock burst are analyzed together with the mechanism behind. Finally, corresponding measures against the rock burst in the island coal face are proposed.

关键词：孤岛工作面采煤工作面危险区预测岩爆实例防治数值模拟方法瓦斯爆炸

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场域论视角下社会组织发展影响因素的实证探究

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宿州学院学报 2021年第8期36卷 38-43页

作者：范凌霄安徽师范大学历史与社会学院安徽芜湖241000

为进一步推进新时代背景下社会组织稳健发展,概述了我国社会组织的研究现状,提出了经济、政治、文化、社会、科技5个场域影响社会组织发展的研究假设,论证了5者与社会组织发展之间的关系,得出:经济、政治、文化、科技4场域对社会组织发... 详细信息

为进一步推进新时代背景下社会组织稳健发展,概述了我国社会组织的研究现状,提出了经济、政治、文化、社会、科技5个场域影响社会组织发展的研究假设,论证了5者与社会组织发展之间的关系,得出:经济、政治、文化、科技4场域对社会组织发展呈正向作用;社会场域的教育子场域对社会组织发展具有促进作用,而其医疗卫生子场域与社会组织发展负相关。探讨了相关的发展对策:政治场域中,应处理好社会组织与政府关系,实现政社分开、合作共强;社会场域中,要重视教育的社会功能,改革员工教育制度,提高社会组织整体素质。

关键词：社会组织场域理论影响因素

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基于改进时频共空间模式的运动想象脑电信号分类

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传感技术学报 2022年第11期35卷 1483-1490页

作者：范凌霄高云园马玉良杭州电子科技大学自动化学院浙江杭州310018 浙江省脑机协同智能重点实验室浙江杭州310018

共空间模式侧重提取信号的空间信息,是脑电信号中滤波和特征提取的常用算法之一。然而脑电信号的时间窗、频带和通道的选择都会影响其分类结果。为了提高CSP特征的表征能力,采用了基于相关系数的脑电通道选择方法,结合时频共空间模式提... 详细信息

共空间模式侧重提取信号的空间信息,是脑电信号中滤波和特征提取的常用算法之一。然而脑电信号的时间窗、频带和通道的选择都会影响其分类结果。为了提高CSP特征的表征能力,采用了基于相关系数的脑电通道选择方法,结合时频共空间模式提取特征,提出了通道选择共时频空间模式(CS-CTFSP)新框架。首先利用通道间相关性,在主通道的基础上筛选合适的通道集合;并利用时频共空间模式从每个时间窗口的多个子频带中提取CSP特征;接着引入一种子频带筛选方法去除无区分能力的频带单元后,结合LASSO提取稀疏特征;最后采用LDA分类器对脑电信号进行分类。在对BCI Competition III Dataset IVa和BCI Competition IV Dataset I二分类运动想象任务的分类实验中,平均分类精度达到91.10%和87.92%,并与其他运动想象方法进行了比较,验证了本文方法的有效性。

关键词：脑机接口运动想象时频共空间模式通道选择

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DCS系统在复杂金精矿冶炼系统中的应用

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现代矿业 2016年第7期32卷 226-229,256页

作者：范凌霄北京矿冶研究总院

以某冶炼企业复杂金精矿开发利用项目为例,从设计思路、系统架构、软硬件组成、控制方案等方面介绍了DCS系统在实际工作中的应用情况。经现场实际运行,该系统极大地提高了企业的生产和管理效率。

关键词：金精矿集散控制系统冶炼

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Trialkylsilyl-thiophene-conjugated acceptor for efficient organic solar cells compatible with spin-coating and blade-coating technologies

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Science China Chemistry 2024年

作者： Tengfei Li Qiang Wu Zefan Yao Hairui Bai Wenyan Su Rui Sun lingxiao Tang Zhaozhao Bi Xiaojun Li Weiguo Zhu Jie Min Qunping fan Wei Ma The Institute for Advanced Studies Wuhan University Jiangsu Engineering Research Center of Light-Electricity-Heat Energy-Converting Materials and Applications School of Materials Science and Engineering and Changzhou University School of Materials Science and Engineering Xi'an University of Science and Technology College of Chemistry and Molecular Engineering Peking University Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of Organic Solids Institute of Chemistry Chinese Academy of Sciences State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong University

Sidechain engineering as an efficient and convenient strategy has been widely used to optimize molecular structure of photovoltaic materials for boosting power conversion efficiency(PCE) of organic solar cells(OSCs). Herein, a new Y-series acceptor named Y-ThSi with trialkylsilyl-substituted thiophene as conjugated sidechain is developed. Compared with its parental Y6 with multiple intermolecular interactions, Y-ThSi has a unitary molecular packing due to the additional steric hindrance from twodimensional(2D)-conjugated trialkylsilyl-thiophene. Therefore, Y-ThSi shows an obviously blue-shifted absorption with an onset of ～850 nm but significantly up-shifted lowest unoccupied molecular orbital energy level. For the PM6:Y-ThSi pair, the spin-coating OSCs achieve a decent PCE of 14.56% with an impressively high photovoltage(VOC) of 0.936 V. Inspired by its high VOCand narrow absorption, Y-ThSi is introduced into near-infrared absorbing binary PM6:BTP-eC9 host to construct ternary OSCs. Thanks to the complementary absorption, optimized morphology, and minimized energy loss properties, the PM6:BTP-eC9:Y-ThSi-based OSCs offer a higher PCE of 18.34%. Moreover, our developed strategy can overcome the commonly existed PCE drop when the blade-coating towards large-scale printing is used instead. Therefore, a comparable PCE of 18.34% is achieved, which is one of the best values for the blade-coating OSCs so far.

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红细胞分布宽度和脑梗死患者颈动脉粥样硬化斑块稳定性的关系

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中风与神经疾病杂志 2015年第8期32卷 708-711页

作者：宋芷珩范凌霄中国医科大学附属盛京医院神经内科辽宁沈阳110022

目的探讨红细胞分布宽度（red blood cell distribution width,RDW）水平和脑梗死患者颈动脉粥样硬化斑块稳定性的关系。方法根据颈动脉彩色多普勒超声仪检查结果,将147例脑梗死患者分为稳定斑块组56例,不稳定斑块组91例,以及51例正常... 详细信息

目的探讨红细胞分布宽度（red blood cell distribution width,RDW）水平和脑梗死患者颈动脉粥样硬化斑块稳定性的关系。方法根据颈动脉彩色多普勒超声仪检查结果,将147例脑梗死患者分为稳定斑块组56例,不稳定斑块组91例,以及51例正常对照组。收集一般临床资料及缺血性脑血管病危险因素,测定血脂、糖化血红蛋白、血红蛋白、RDW、高敏C反应蛋白（high sensitivity C-reactive protein,hs-CRP）、血浆纤维蛋白原（fibrinogen,Fib）等并进行组间比较。结果（1）与对照组相比,脑梗死组RDW、TC、LDL-C、hs-CRP明显增高,差异有统计学意义（P〈0.05）。（2）稳定斑块组、不稳定斑块组与对照组相比RDW含量明显升高,差异具有统计学意义（P〈0.05）;不稳定斑块组RDW水平明显高于稳定斑块组,具有显著性差异（P〈0.05）。（3）调整性别、年龄因素后,RDW为颈动脉不稳定斑块的危险因素（OR=1.649,95%CI 0.997∽2.727,P〈0.05）。结论 RDW水平的增高和颈动脉粥样硬化斑块的不稳定性密切相关。

关键词：红细胞分布宽度颈动脉粥样硬化斑块脑梗死

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六味地黄丸治疗2型糖尿病疗效观察及其对血脂水平的影响

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新中医 2019年第11期51卷 57-59页

作者：樊晓芳汪凌霄绍兴市中心医院

目的:观察六味地黄丸治疗2型糖尿病(T2DM)的临床疗效及对患者血脂水平的影响。方法:将94例患者随机分为对照组和观察组,每组47例;对照组给予二甲双胍格列本脲片(Ⅰ)治疗,观察组在对照组的基础上加用六味地黄丸治疗;疗程均为3个月,观察比... 详细信息

目的:观察六味地黄丸治疗2型糖尿病(T2DM)的临床疗效及对患者血脂水平的影响。方法:将94例患者随机分为对照组和观察组,每组47例;对照组给予二甲双胍格列本脲片(Ⅰ)治疗,观察组在对照组的基础上加用六味地黄丸治疗;疗程均为3个月,观察比较2组临床疗效,并于治疗前后检测2组患者空腹血糖(FBG)、餐后2h血糖(P2hBG)、糖化血红蛋白(HbA1c)及血脂[总胆固醇(TC)、甘油三酯(TG)、高密度脂蛋白胆固醇(HDL-C)、低密度脂蛋白胆固醇(LDL-C)]水平变化。结果:总有效率观察组为97.87%,对照组为82.98%,2组比较,差异有统计学意义(P0.05)。治疗后,2组患者TC、TG、LDL-C均较治疗前下降,HDL-C较治疗前上升,差异均有统计学意义(P<0.05);且观察组上述各项指标改善优于对照组(P<0.05)。结论:六味地黄丸治疗T2DM患者可明显提高临床疗效,改善患者血糖及血脂水平,值得临床推广应用。

关键词： 2型糖尿病中西医结合疗法二甲双胍格列本脲片(Ⅰ) 六味地黄丸血脂

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