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Nanodiamond/Ti_(3)C_(2) MXene-coated quartz crystal microbalance humidity sensor with high sensitivity and high quality factor

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Rare Metals 2024年第6期43卷 2719-2729页

作者： Yao Yao qiao chen Yan-Qi Li Xian-He Huang Wei-Wei Ling Zhe-MiaoXie Jia-QiWang Chang-Ming chen College of Communication Engineering Chengdu University of Information TechnologyChengdu 610225China School of Automation Chongqing University of Posts and TelecommunicationsChongqing 400065China School of Automation Engineering University of Electronic Science and Technology of ChinaChengdu 611731China Advanced Micro-/Nano-Devices Lab Department of Systems Design EngineeringUniversity of WaterlooWaterlooON N2L 3GlCanada

To address the challenge of achieving both high sensitivity and a high quality factor in quartz crystal microbalance(QCM)humidity sensors,a nanodiamond(ND)/Ti_(3)C_(2)MXene composite-coated QCM humidity sensor was *** material characteristics of ND,Ti_(3)C_(2)MXene,and ND/Ti_(3)C_(2)MXene composite were analyzed by transmission electron microscopy(TEM)and Fourier transform infrared(FTIR)*** experimental results demonstrated that the hydrophilic ND nanoparticles coated on Ti_(3)C_(2) MXene nanosheet prevented the self-stacking of Ti_(3)C_(2)MXene and enhanced the sensitivity of Ti_(3)C_(2) MXene-based QCM humidity ***,the high mechanical modulus of Ti_(3)C_(2) MXene material helped ND/Ti_(3)C_(2)MXene composite-coated QCM humidity sensor to achieve a high quality factor(>20,000).ND/Ti_(3)C_(2)MXene compositecoated QCM humidity sensor exhibited a sensitivity of 82.45 Hz/%RH,a humidity hysteresis of 1.1%RH,fast response/recovery times,acceptable repeatability,and good stability from 11.3%RH to 97.3%*** response mechanism of ND/Ti_(3)C_(2) MXene composite-coated QCM humidity sensor was analyzed in combination with a bi-exponential kinetic adsorption ***,the potential application of ND/Ti_(3)C_(2)MXene composite-coated QCM humidity sensor was demonstrated through its frequency response to wooden blocks with different moisture contents.

关键词： Humidity sensor Quartz crystal microbalance Nanodiamond Ti_(3)C_(2)MXene High quality factor

Asymptotic Property of Parabolic Equations Involving Pseudo-relativistic Schr?dinger Operators

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Acta Mathematicae Applicatae Sinica 2024年

作者： chen qiao Su-fang TANG School of Mathematics and Statistics Shaanxi Normal University School of Mathematics Xi'an University of Finance and Economics

In this paper, we investigate parabolic equations involving nonlocal pseudo-relativistic Schr?dinger operators（-△+ m2）swith s ∈（0, 1） and mass m > 0 in bounded regions. We establish the asymptotic narrow region principle and asymptotic strong maximum principle for anti symmetric function. As applications,employing the method of moving planes, we show the asymptotical radial symmetry and monotonicity of positive solutions in an unit ball.

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Arbitrarily rotating polarization direction and manipulating phases in linear and nonlinear ways using programmable metasurface

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Light(Science & Applications) 2024年第9期13卷 1789-1800页

作者： Wei Liu Si Ran Wang Jun Yan Dai Lei Zhang qiao chen Qiang cheng Tie Jun Cui State Key Laboratory of Millimeter Waves Southeast UniversityNanjing 210096China Institute of Electromagnetic Space Southeast UniversityNanjing 210096China Frontiers Science Center for Mobile Information Communication and Security Southeast UniversityNanjing 210096China Electrical Engineering Department Chalmers University of TechnologyGothenburg 41258Sweden

Independent controls of various properties of electromagnetic(EM)waves are crucially required in a wide range of *** metasurface is a promising candidate to provide an advanced platform for manipulating EM ***,we propose an approach that can arbitrarily control the polarization direction and phases of reflected waves in linear and nonlinear ways using a stacked programmable ***,we extend the space-timecoding theory to incorporate the dimension of polarization,which provides an extra degree of freedom for manipulating EM *** proof-of-principle application examples,we consider polarization rotation,phase manipulation,and beam steering at linear and nonlinear *** validation,we design,fabricate,and measure a metasurface *** experimental results show good agreement with theoretical predictions and *** proposed approach has a wide range of applications in various areas,such as imaging,data storage,and wireless communication.

关键词： surface. nonlinear rotating

Pool bio-oxidation and fitting analysis of low-grade arsenic-containing refractory gold ore

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Green Chemical Engineering 2024年第4期5卷 511-518页

作者： Jiafeng Li Linlin Tong Haijun Zhang qiao chen Hongying Yang Lingling Shen Yiqin Zhai Rongfan Yao School of Mines China University of Mining and Technology School of Metallurgy Northeastern University School of Chemical Engineering Technology China University of Mining and Technology School of Materials Science and Engineering Lanzhou University of Technology School of Intelligent Manufacturing Jiangsu Vocational Institute of Architectural Technology

To overcome the limitations of geography, climate, and ore characteristics on the ore beneficiation process, biooxidation studies on low-grade arsenic-bearing refractory gold ore by pool leaching were carried out, as well as process fitting analysis. The gold particles are encapsulated by pyrite and arsenopyrite. After 60 days of biooxidation, the oxidation rates of arsenic, sulfur, and gold were 39%～69%, 24%～41%, and 49%～83%, respectively. The inoculated Acidithiobacillus ferrooxidans, Ferroplasma acidiphilum, and Leptospirillum ferrodiazotrophum could all mediate the initial pyrite/arsenopyrite oxidation and the Fe2+oxidation reaction, but only the former could mediate the subsequent sulfur compound oxidation. When compared to daily bacterial circulation and bacterial replacement every ten days, aeration improved the gold leaching rate by 14%～22%. The Boltzmann model could fit both the arsenic and sulfur bio-oxidation, with model fit variances greater than 0.98. Based on the experimental and fitting results, the bio-oxidation cycle was determined to be 60 days, and the bio-oxidation mechanisms are summarized. This study has significant practical implications for the rational utilization of gold resources and provides theoretical and practical guidance for similar gold ores.

关键词： Refractory gold ore Bio-oxidation Pool leaching Boltzmann model

Thymic carcinoid with multiple bone metastases:A case report

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World Journal of Clinical Cases 2024年第13期12卷 2275-2280页

作者： Chun-qiao chen Ming-Yue Huang Min Pan Qiu-Qiu chen Fei-Fei Wei Hui Huang Department of Oncology People’s Hospital of GuilinGuilin 541000Guangxi Zhuang Autonomous RegionChina

BACKGROUND Thymic carcinoid(TC)is a rare entity among anterior mediastinal *** are neuroendocrine carcinomas that constitute approximately 2%–5%of all thymic epithelial *** SUMMARY The study reported a rare TC with multiple bone metastases.A 77-year-old man presented with a 2-month history of lower back pain and weight loss of 5 *** resonance imaging scans revealed damage to the lumbar spine,sacrocaudal vertebrae and iliac crest,suggesting bone metastasis;computed tomography(CT)scan of the thorax showed a calcified anterior mediastinal mass;positron emission tomography-CT demonstrated multiple abnormal bone signals;and laboratory work-up showed no endocrine ***-needle aspiration biopsy revealed predominantly single small,round to oval cells with scant cytoplasm and some loose clusters,suggesting endocrine *** pathological diagnosis was atypical carcinoid,which tend to originate from the thymus and was classified as intermediate-highly *** patient underwent anlotinib-targeted ***(12 mg)was administered daily for 2 wk,after which the patient was allowed to rest for 21 ***-up CT after one year demonstrated that the tumor had shrunk by approximately 29%after *** has a long stable disease benefit of more than 2.5 *** These findings demonstrated that anlotinib is a promising treatment regimen for patients with TC and multiple bone metastases.

关键词： Thymic carcinoid Anlotinib Multitargeted tyrosine kinase inhibitor Bone metastasis Case report

Structural and functional design of geopolymer adsorbents:a review

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Tungsten 2024年第1期6卷 48-76页

作者： Hai-Ze Jin chen-Xi Qiu Yan-Song Li Bao Liu Jun-Yi Liu qiao chen Xue-Feng Lu Cui-Xia Li Qi-Kun Wang School of Materials Science and Engineering Lanzhou University of TechnologyLanzhou 730050China State Key Laboratory of Advanced Processing and Recycling of Non-Ferrous Metals Lanzhou 730050China Shenyang Nonferrous Metals Research Institute Co. LTDShenyang 110000China Automotive Engineering Research Institute Jiangsu UniversityZhenjiang 212013China School of Materials Science and Engineering Jingdezhen Ceramic UniversityJingdezhen 333403China

The water pollution derived from the discharge of heavy metals,antibiotics,dyes and surfactants wastewater,*** seriously affected human survival and ecological *** an efficient and low-cost physical wastewater treatment process,the adsorption is a continuous hot spot in related scientific research and *** are non-crystal or semi-crystalline materials with high-efficiency adsorption performance due to the alkali metal ions that balance the electronegative aluminosilicate skeleton can be efficiently replaced by other cations in the aqueous *** related studies of different application conditions,service objects and morphological differences of geopolymer adsorbents based on structure-function design have been in-depth exploration and *** review aims to summarize the research progres s of the structure-function design based on the geopolymerization mechanism and kinetics and service *** overview of service characteristics and progress of geopolymers in the wastewater treatment field(e.g.,dyes,heavy metals,radionuclides,surfactants,antibiotics,ammonium,phosphorus,nitrogen and CO_(2),etc.)are systematically *** the evolution and development of morphological differences and the relationship of structure-function design of geopolymer adsorbents were compared and ***,the challenge worth overcoming,the trends worth considering and perspectives worth developing are highlighted.

关键词： Geopolymer Wastewater Adsorption Structure-function design Application

Hypofractionated and intensity-modulated radiotherapy combined with systemic therapy in metastatic hepatocellular carcinoma:A case report

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World Journal of Clinical Oncology 2024年第10期15卷 1342-1350页

作者： Qiu-Qiu chen Chun-qiao chen Jin-Kun Liu Ming-Yue Huang Min Pan Hui Huang Department of Oncology People’s Hospital of GuilinGuilin 541002Guangxi Zhuang Autonomous RegionChina

BACKGROUND Liver cancer treatment is characterized by multidisciplinary participation and coexistence of multiple treatment *** and intensity-modulated radiotherapy is a new precise radiotherapy technique applied to the treatment of systemic malignant *** is a lack of understanding of hypofractionated and intensity-modulated radiotherapy combined with systemic therapy in metastatic hepatocellular carcinoma(HCC).CASE SUMMARY We report a case of metastatic HCC treated with hypofractionated and intensity-modulated radiotherapy combined with systemic therapy.A 41-year-old man was diagnosed with metastatic HCC(T3N1M1 stage IVB).Because it was found to be in the late stage of cancer and had already metastasized,it was impossible to undergo surgical *** addition to aggressive comprehensive treatment for the primary lesion,local treatment for metastatic cancer can improve the patient's survival *** and intensity-modulated radiotherapy can provide a larger single treatment dose within a shorter overall treatment time,and improve the local control rate of the ***-up examination demonstrated that the tumor and metastatic lesions had shrunk after *** treatment has showed good *** patient survived for 18 months without disease progression and stable disease persisted for>38 *** Targeted therapy and immunotherapy followed by hypofractionated and intensity-modulated radiotherapy are also effective for advanced metastatic HCC.

关键词： Hypofractionated therapy Intensity-modulated radiation Hepatocellular carcinoma Metastasis Case report

基于SMCS模型的高强螺栓及节点火灾全过程断裂性能模拟

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工程力学 2024年第2期41卷 56-70,159页

作者：陈桥姜健蔡文玉陈伟叶继红中国矿业大学力学与土木工程学院江苏徐州221116 海南大学土木建筑工程学院海南海口570228

高强螺栓广泛应用于钢结构节点连接,火灾高温会影响其基本材性和断裂行为,从而影响螺栓节点抗火性能甚至整体结构抗倒塌性能。基于10.9级高强螺栓火灾全过程(升温段、降温段、火灾后)单轴拉伸试验结果,结合有限元模拟,对不同温度历程和... 详细信息

高强螺栓广泛应用于钢结构节点连接,火灾高温会影响其基本材性和断裂行为,从而影响螺栓节点抗火性能甚至整体结构抗倒塌性能。基于10.9级高强螺栓火灾全过程(升温段、降温段、火灾后)单轴拉伸试验结果,结合有限元模拟,对不同温度历程和应力三轴度对应的螺栓SMCS断裂模型进行校准,并与螺栓材性试验和T-stub节点试验结果对比验证;对T-stub节点火灾全过程断裂行为进行参数分析,研究损伤准则和温度历程对节点失效模式和变形特征的影响。结果表明:校准的SMCS模型能够有效、准确地预测螺栓和节点在火灾全过程和高应力三轴度(0.3~1.2)下的受拉断裂行为,适用预测误差在12%以内;拉伸温度和峰值温度是影响高强螺栓抗断能力的主要因素,螺栓抗断能力随温度升高而提高;不同温度历程下T-stub节点可能发生翼缘板屈服断裂、翼缘板和螺栓同时屈服断裂、螺栓屈服断裂三种失效模式,且节点的变形能力(延性系数)与失效模式有关,确定钢板母材和螺栓的断裂模型是准确预测节点失效模式的关键。

关键词：火灾全过程高强螺栓 SMCS模型断裂性能 T-stub节点

Enhanced thermal constant B of diamond films for ultrahigh sensitivity negative temperature coefficient thermistors

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Science China Materials 2024年第10期67卷 3321-3329页

作者： qiao chen Yimeng Zhao Jiawei Li Xiyuan Liu Xinyue Wang Wenxi Zhang Hongwei Zhu Gemmological Institute China University of GeosciencesWuhan 430074China Shenzhen Research Institute China University of GeosciencesShenzhen 518057China State Key Lab of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China Southwest United Graduate School Kunming 650500China

Negative temperature coefficient(NTC)thermistor plays a crucial role in science research and engineering applications for precise temperature *** great progress has been achieved in NTC materials,enhancing sensitivity and maintaining this high sensitivity along with linearity across extensive temperature ranges remain a significant *** this study,we introduce a diamondbased thermistor(DT)characterized by its outstanding sensitivity,swift response time,and broad temperature monitoring *** temperature constant B for this DT,measured from 30 to 300°C(B30/300),achieves an exceptional value of 8012 K,which notably exceeds the temperature sensing capabilities of previously reported NTC thermistors within this extensive ***,diamond’s unique thermal conductivity and stability significantly boost the response speed and durability of the DT,offering substantial advantages over traditional ceramic *** enhanced temperature-sensitive properties of the DT are attributed to the presence of impurity elements in polycrystalline *** analysis indicates a hopping conduction mechanism,likely involving C-H or C-N dipoles at the diamond grain *** study marks a significant leap forward in diamond thermistor technology and sheds light on the mechanisms of thermal active conduction in diamond materials.

关键词： polycrystalline diamond thermistors negative temperature coefficient hopping conduction grain boundary