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Influence of A-site doping barium on structure,magnetic and microwave absorption properties of LaFeO_(3)ceramics powders

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Journal of Rare Earths 2022年第7期40卷 1106-1117页

作者： Lei Huang Lichun cheng Shunkang Pan Qingrong Yao Qianxin Long Man Wang yucheng chen Huaiying Zhou School of Materials Science and Engineering Guilin University of Electronic TechnologyGuilin 541004China Guangxi Key Laboratory of Information Materials Guilin University of Electronic TechnologyGuilin 541004China

In this paper,the effect of Ba^(2+)ions A-site doping LaFeO_(3)on structure,magnetic properties and microwave absorption properties was investigated by the sol-gel *** to the TEM and FullProf refinement results,the structure of LaFeO_(3)changes from orthogonal(SG:Pnma)to cubic(SG:Pm-3 m)when the Ba doping amount is x=*** SEM image shows that the particles size tends to decrease with the increase of Ba *** production of weak ferromagnetism indicates that Ba doping has a significant effect on the magnetic properties of LaFeO_(3).The Neel temperature(TN)decreases significantly with the increase of Ba doping *** appropriate amount of Ba doping can effectively increase the dielectric and magnetic loss of LaFeO_(3)ceramics *** increase permittivity(ε’andε″)may be attributed to the hopping of the electrons between the Fe^(3+)and Fe^(4+)ions with the Ba^(2+)ions *** minimum reflection loss(RL_(min))of La_(0.9)Ba_(0.1)FeO_(3)at 6.72 GHz reaches-30.04 dB,its effective bandwidth(RL≤-10 dB)is 2.1 GHz,and the matching thickness is only 3.2 *** results indicate that Ba doping can effectively control the microwave absorption properties of LaFeO_(3),especially in the Cband.

关键词： LaFeO_(3)ceramics Crystal structure Magnetic Electromagnetic parameters Microwave absorption Rare earths

Effect of neodymium doping on structure,magnetic properties and microwave absorption performance of SrMnO_(3)

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Journal of Rare Earths 2024年第2期42卷 354-363,I0005页

作者： Jixiang Yue Lichun cheng Jilei Xiong Qingrong Yao Man Wang yucheng chen Qianxin Long Xiaojian Guo School of Materials Science and Engineering Guilin University of Electronic TechnologyGuilin541004China Guangxi Key Laboratoryof Information Materials Guilin University of Electronic Technology Guilin541004China Anhui Jihua New Materials Co. Ltd.Anqing246300China

A simple composite Sr_(1-x)Nd_(x)MnO_(3)(x=0,0.05,0.1,0.15,0.2) nano powders were successfully prepared by the sol-gel method as a light-weight broadband electromagnetic wave *** effect of Nd^(3+)doping on the structure,microstructure and properties of SrMnO_(3) was *** is found that with the doping of Nd^(3+),the space group of the SrMnO_(3) changes from p63/mmc to pm3m,and the crystalline shape starts to change from hexagonal to cubic *** electron microscopy(SEM) and Brunauer-Emmett-Teller(BET) tests confirm that the particle sizes of the sample decrease and the specific surface area increases,which are attributed to the inhibition of grain growth after Nd^(3+)is doped.X-ray photoelectron spectroscopy(XPS) shows that after Nd^(3+)doping,the content of oxygen vacancy increases,and Mn^(4+) converts to Mn^(3+).Due to the defects of the materials,the polarization effect is enhanced,thus,the dielectric and magnetic properties of the doped samples are *** maximum reflection loss of the Sr_(0.85)Nd_(0.15)MnO_(3) is-33.41 dB at 7.84 GHz for a thickness of 2.4 mm,while Sr_(0.9)Nd_(0.1)MnO_(3) has the best bandwidth performance at 2.32 GHz with a reflection loss below-10dB.

关键词： Sr_(1-x)Mn_xO_(3) Crystal structure Microwave absorption Magnetic properties Nano powder Rare earths

Risk Prevention and Control for Agricultural Non-Point Source Pollution Based on the Process of Pressure-Transformation-Absorption in Chongqing, China

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Chinese Geographical Science 2021年第4期31卷 735-750页

作者： ZHU Kangwen chen yucheng ZHANG Sheng YANG Zhimin HUANG Lei LEI Bo XIONG Hailing WU Sheng LI Xixi College of Resources and Environment Southwest UniversityChongqing 400716China Chongqing Engineering Research Center of Rural Cleaning Chongqing 400716China Chongqing Academy of Ecology and Environmental Sciences Chongqing 401147China College of Computer&Information Science Southwest UniversityChongqing 400716China Chongqing Chemical Industry Vocational College^Chongqing 401220 China

According to China’s second national survey of pollution sources, the contribution of agricultural non-point sources(ANS) to water pollution is still high. Risk prevention and control are the main means to control costs and improve the efficiency of ANS, but most studies directly take pollution load as the risk standard, leading to a considerable misjudgment of the actual pollution risk. To objectively reflect the risk of agricultural non-point source pollution(ANSP) in Chongqing, China, we investigated the influences of initial source input, intermediate transformation, and terminal absorption of pollutants via literature research and the Delphi method and built a PTA(pressure kinetic energy, transformation kinetic energy, and absorption kinetic energy) model that covers 12 factors, with the support of geographical information system(GIS) technology. The terrain factor calculation results and the calculation results of other factors were optimized by Python tools to reduce human error and workload. Via centroid migration analysis and Kernel density analysis, the risk level, spatial aggregation degree, and key prevention and control regions could be accurately determined. There was a positive correlation between the water quality of the rivers in Chongqing and the risk assessment results of different periods, indirectly reflecting the reliability of the assessment results by the proposed model. There was an obvious tendency for the low-risk regions transforming into high-risk regions. The proportion of high-risk regions and extremely high-risk regions increased from 17.82% and 16.63%in 2000 to 18.10% and 16.76% in 2015, respectively. And the risk level in the main urban areas was significantly higher than that in the southeastern and northeastern areas of Chongqing. The centroids of all grades of risky areas presented a successive distribution from west to east, and the centroids of high-risk and extremely high-risk regions shifted eastward. From 2000 to 2015, the c

关键词： geographic information system(GIS) agricultural non-point source pollution(ANSP) risk assessment Kernel density Chongqing China

Wearable CNT/Ti_(3)C_(2)T_(x)MXene/PDMS composite strain sensor with enhanced stability for real-time human healthcare monitoring

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Nano Research 2021年第8期14卷 2875-2883页

作者： Xiaowen Xu yucheng chen Pei He Song Wang Kai Ling Longhui Liu Pengfei Lei Xianjun Huang Hu Zhao Jianyun Cao Junliang Yang Hunan Key Laboratory for Super Microstructure and Ultrafast Process School of Physics and ElectronicsCentral South UniversityChangsha 410083China Hunan Engineering Research Center of Biomedical Metal and Ceramic Implants Department of Orthopedic SurgeryXiangya HospitalCentral South University87#Xiangya RoadChangsha 410007China College of Electronic Science National University of Defense TechnologyChangsha 410072China Department of Materials University of ManchesterOxford RoadManchester Ml 39PLUK

Strain sensors with good stability are vital to the development of wearable healthcare monitoring ***,the design of strain sensor with both duration stability and environmental stability is still a *** this work,we propose an ultra-stable and washable strain sensor by embedding a coupled composite film of carbon nanotube(CNT)and Ti_(3)C_(2)T_(x) MXene into polydimethylsiloxane(PDMS)*** composite strain sensor with embedded microstructure and uneven surface makes it conformal to skin,while the CNT/MXene sensing layer exhibits a resistance sensitive to *** sensor shows reliable responses at different frequencies and with long-term cycling durability(over 1,000 cycles).Meanwhile,the CNT/MXene/PDMS composite strain sensor provides the advantages of superior anti-interference to temperature change and water *** results demonstrate less than 10%resistance changes as the temperature rises from-20 to 80℃or after sonication in water for 120 min,*** composite sensor is applied to monitor human joint motions,such as bending of finger,wrist and ***,the simultaneous monitoring of the electrocardiogram(ECG)signal and joint movement while riding a sports bicycle is demonstrated,enabling the great potential of the as-fabricated sensor in real-time human healthcare monitoring.

关键词： strain sensor MXene wearable electronics healthcare monitoring

Multi-Task Learning Using Attention-Based Convolutional Encoder-Decoder for Dilated Cardiomyopathy CMR Segmentation and Classification

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Computers, Materials & Continua 2020年第5期63卷 995-1012页

作者： Chao Luo Canghong Shi Xiaojie Li Xin Wang yucheng chen Dongrui Gao Youbing Yin Qi Song Xi Wu Jiliu Zhou 无 College of Computer Science Chengdu University of Information TechnologyChengdu610000China College of Information Science and Technology Southwest Jiaotong UniversityChengdu610000China West China Hospital Sichuan UniversityChengdu610000China AI Institute CuraCloud CorporationSeattle98101USA

Myocardial segmentation and classification play a major role in the diagnosis of cardiovascular *** Cardiomyopathy(DCM)is a kind of common chronic and life-threatening *** diagnostics significantly increases the chances of correct treatment and ***,accurate and rapid diagnosis of DCM is still challenge due to high variability of cardiac structure,low contrast cardiac magnetic resonance(CMR)images,and intrinsic noise in synthetic CMR images caused by motion artifact and cardiac ***,visual assessment and empirical evaluation are widely used in routine clinical diagnosis,but they are subject to high inter-observer variability and are both subjective and *** solve this problem,we proposed an effective unified multi-task framework for dilated cardiomyopathy CMR segmentation and classification simultaneously,and we firstly update one independent encoder from both recovery decoder and parallel attention path sharing some partial *** can encode both task choices into good embedding,but each one can achieve significant improvements respectively from the given *** consists of three branches:extraction path,attention path,and recovery path,which allows the model to learn more higher-level intermediate representations and makes a more accurate *** validated our approach on a DCM dataset,which contains 1155 CMR LGE *** results show that our multi-task network has achieved accuracy of 97.63%,AUC of 98.32%,demonstrating effectively segmenting the myocardium,quickly and accurately diagnosing the presence or absence of dilation.

关键词： Dilated cardiomyopathy multitasking network attention classification segmentation

Strongly coupled Te-SnS_(2)/MXene superstructure with self-autoadjustable function for fast and stable potassium ion storage

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Journal of Energy Chemistry 2021年第10期30卷 416-424,I0011页

作者： Hongyang Sun Yelong Zhang Xiaodan Xu Jianwen Zhou Fan Yang Hao Li Hao chen yucheng chen Zheng Liu Zhenping Qiu Da Wang Lipo Ma Jiawei Wang Qingguang Zeng Zhangquan Peng School of Applied Physics and Materials Wuyi UniversityJiangmen 529020GuangdongChina Jiangmen Advanced Battery Material Engineering and Technology Research Center Jiangmen 529020GuangdongChina Laboratory of Advanced Spectro-Electrochemistry and Lithium-Ion Batteries Dalian National Laboratory for Clean EnergyDalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023LiaoningChina

Potassium-ion batteries(PIBs)are a promising candidate for next-generation electric energy storage applications because of the abundance and low cost of ***,the development of PIBs is limited by sluggish kinetics and huge volume expansion of anodes,leading to poor rate capability and cycling ***,an advanced superstructure anode,including Te-doped SnS_(2) nanosheets uniformly anchored on MXene surface(Te-SnS_(2)/MXene),is rationally designed for the first time to boost K^(+)storage *** with strong interface interaction and self-autoadjustable interlayer spacings,the Te-SnS_(2)/MXene can efficiently accelerate electron/ion transfer,accommodate volume expansion,inhibit crack formation,and improve pseudocapacitive contribution during ***,the novel Te-SnS_(2)/MXene anode delivers a high reversible capacity(343.2 mAh g^(-1) after 50 cycles at0.2 A g^(-1)),outstanding rate capability(186.4 mAh g^(-1) at 20 A g^(-1)),long cycle stability(165.8 mAh g^(-1)after 5000 cycles at 10 A g^(-1) with a low electrode swelling rate of only 15.4%),and reliable operation in flexible full *** present Te-SnS_(2)/MXene becomes among the best transition metal-based anode materials for PIBs reported to date.

关键词： Tin disulfide MXene Tellurium doping Potassium-ion battery

The Role of Clinical Cardiac Magnetic Resonance Imaging in China:Current Status and the Future

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Cardiovascular Innovations and Applications 2016年第B12期2卷 61-71页

作者： Shi chen Qing Zhang yucheng chen Cardiology Division West China HospitalSichuan UniversityChengduSichuan 610041China

Cardiac magnetic resonance(CMR)imaging plays an important role in the diagnosis and management of cardiovascular *** state-of-the-art CMR imaging has many advantages in cardiac imaging,including excellent spatial and temporal resolution,unrestricted imaging fi eld,no exposure to ionizing radiation,excellent tissue contrast,and unique myocardial tissue *** CMR imaging is used during the cardiovascular diagnostic workup in the United States and some European *** of CMR imaging is emerging in hospitals in China and has a promising *** review briefl y describes the real-world clinical application of CMR imaging in China and discuss obstacles for its future development.

关键词： cardiac magnetic resonance cardiovascular disease imaging

Superconvergence of a Nonconforming Finite Element Approximation to Viscoelasticity Type Equations on Anisotropic Meshes

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Numerical Mathematics A Journal of Chinese Universities(English Series) 2006年第4期15卷 375-384页

作者： Dongyang Shi yucheng Peng Shaochun chen Department of Mathematics Zhengzhou University Zhengzhou 450052 China

The main aim of this paper is to study the approximation to viscoelasticity type equations with a Crouzeix-Raviart type nonconforming finite element on the anisotropic meshes. The superclose property of the exact solution and the optimal error estimate of its derivative with respect to time are derived by using some novel techniques. Moreover, employing a postprocessing technique, the global superconvergence property for the discretization error of the postprocessed discrete solution to the solution itself is studied.

关键词：黏弹性型函数 Crouzeix-Raviart型元素后加工各向异性网目

Changes in the clinical features, treatments, and outcomes of patients with systemic light chain (AL) amyloidosis in Western China, 2010-2022: A multicenter, retrospective, real-world study

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中华医学杂志(英文版) 2024年第21期137卷 2624页

作者： Yu Hongbin Zhao Lei Li Jiawei Zhang Chunlan Liu Qinyu Zhou Jie Xu Fang Xiao Jian Yuan Ying Yan Siyu chen yucheng Zhang Qing Shang Huifang Hu Zhangxue Wu Yu Department of Hematology West China Hospital Sichuan University Chengdu Sichuan China West China School of Public Health and West China Fourth Hospital Sichuan University Chengdu Sichuan China Department of Hematology People’s Hospital of Deyang City Deyang Sichuan China Department of Hematology Mianyang Central Hospital School of Medicine University of Electronic Science and Technology of China Mianyang Sichuan China Department of Hematology Zigong First People’s Hospital Zigong Sichuan China Department of Hematology Guangyuan Central Hospital Guangyuan Sichuan China Department of Cardiology West China Hospital Sichuan University Chengdu Sichuan China Department of Neurology West China Hospital Sichuan University Chengdu Sichuan China Department of Nephrology West China Hospital Sichuan University Chengdu Sichuan China

[1,2] However, data of China’s situation remain limited, especially since the novel therapeutic agents were included in the national medical insurance reimbursement list (NMIRL) in late 2017, systemic light chain is listed in the first national list of rare diseases released, and the neoplasm multidisciplinary teams (MDTs) was established by the National Health Commission of China in 2018.[...]a multicenter, retrospective, real-world study (AMY4002) was conducted in Western China to report the clinical baselines, treatment patterns, and outcomes of Chinese AL amyloidosis patients before and after 2018.The overall response rate (ORR) was defined as the proportion of patients achieving a partial or better hematologic response, excluding patients with missing data on response assessment.See PDF] For first-line treatment, the bortezomib-based regimen achieved a hematological overall response rate (ORR) of 77.8% (91/117), a complete response (CR) in 23.9% (28/117), a very good partial response (VGPR) in 29.1% (34/117), and a partial response (PR) in 24.8% (29/117) of patients.[1,2] Although there is no statistically significant difference, an improvement trend in survival was observed in the later period, with a median of 29 months in the pre-2018 period and a median of 48 months in the post-2018 period at 5 years (P = 0.22; Figure 1B).

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