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Low-temperature heat transport of the zigzag spin-chain compound SrEr_(2)O_(4)

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Chinese Physics B 2022年第8期31卷 621-626页

作者： Liguo chu Shuangkui guang Haidong Zhou Hong Zhu Xuefeng Sun Department of Physics Key Laboratory of Strongly-Coupled Quantum Matter Physics(CAS)University of Science and Technology of ChinaHefei 230026China Department of Physics and Astronomy University of TennesseeKnoxvilleTennessee 37996-1200USA Institute of Physical Science and Information Technology Anhui UniversityHefei 230601China

Low-temperature thermal conductivity(κ),as well as the magnetic properties and specific heat,are studied for the frustrated zigzag spin-chain material Sr Er_(2)O_(4)by using single-crystal *** specific heat data indicate the longrange antiferromagnetic transition at~0.73 K and the existence of strong magnetic *** magnetizations at very low temperatures for magnetic field along the c axis(spin chain direction)or the a axis reveal the field-induced magnetic ***κshows a strong dependence on magnetic field,applied along the c axis or the a axis,which is closely related to the magnetic ***,high magnetic field induces a strong increase ofκ.These results indicate that thermal conductivity along either the c axis or the a axis are mainly contributed by phonons,while magnetic excitations play a role of scattering phonons.

关键词： spin chain quantum spin system thermal conductivity

Microglia accumulation and activation after subarachnoid hemorrhage

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Neural Regeneration Research 2021年第8期16卷 1531-1532页

作者： Junfan chen George Kwok chu Wong Division of Neurosurgery Department of SurgeryThe Chinese University of Hong KongHong Kong Special Administrative RegionChina

Subarachnoid hemorrhage(SAH) is a severe cerebrovascular disease accounting for a significant portion of young patients with stroke with high morbidity and mortality(van Gijn et al., 2007). Secondary brain injury resulting from neuroinflammation is considered to be a key pathological process(Zheng and Wong, 2017). Microglia, the resident immune cells of the brain, are implicated in numerous neurological diseases, such as Alzheimer's disease。

关键词： hemorrhage al. mortality

Functionally Graded Cellular Structure Design Using the Subdomain Level Set Method with Local Volume Constraints

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Computer Modeling in Engineering & Sciences 2021年第9期128卷 1197-1218页

作者： Lianxiong chen Hui Liu Xihua chu Jiao Wang Department of Engineering Mechanics School of Civil EngineeringWuhan UniversityWuhan430072China State Key Laboratory for Structural Analysis of Industrial Equipment Dalian University of TechnologyDalian116024China School of Mechanics and Engineering Southwest Jiaotong UniversityChengdu611756China

Functional graded cellular structure(FGCS)usually shows superiormechanical behaviorwith lowdensity and high *** the development of additivemanufacturing,functional graded cellular structure gains its popularity in *** this paper,a novel approach for designing functionally graded cellular structure is proposed based on a subdomain parameterized level set method(PLSM)under local volume constraints(LVC).In this method,a subdomain level set function is defined,parameterized and updated on each subdomain independently making the proposed approach much faster and more ***,the microstructures on arbitrary two adjacent subdomains can be connected perfectly without any additional ***,the local volume constraint for each subdomain is applied by virtue of the augmented Lagrange multiplier ***,several numerical examples are given to verify the correctness and effectiveness of the proposed approach in designing the functionally graded cellular *** the optimized results,it is also found that the number of local volume constraints has little influence on the convergence speed of the developed approach.

关键词： Multiscale design hierarchical structure functionally graded cellular structure local volume constraints topology optimization

In-situ-reduced synthesis of cyano group modified g-C_(3)N_(4)/CaCO_(3) composite with highly enhanced photocatalytic activity for nicotine elimination

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Journal of Environmental Sciences 2023年第4期126卷 517-530页

作者： chenxiao Qi Haixiang chen Xiufang chen chengyu chu Xueting Mei Wangyang Lu Nan Li National Engineering Lab for Textile Fiber Materials&Processing Technology(Zhejiang) Zhejiang Sci-Tech UniversityHangzhou 310018China

Graphite carbon nitride has many excellent properties as a two-dimensional semiconductor material so that it has a wide application prospect in the field of ***,the traditional problems such as high recombination rate of photogenerated carriers limit its *** this work,we introduce nitrogen deficiency into g-C_(3)N_(4)to solve this problem a simple and safe in-situ reduction method.g-C_(3)N_(4)/CaCO_(3)was obtained by a simple and safe one-step calcination method with industrial-grade micron particles CaCO_(3).Cyano group modification was in-situ reduced during the thermal polymerization process,which would change the internal electronic structure of g-C_(3)N_(4).The successful combination of g-C_(3)N_(4)and CaCO_(3)and the introduction of cyanide have been proved by Fourier transform infrared spectroscopy and X-ray photoelectron *** formation of the cyano group,an electron-absorbing group,promotes the effective separation of photogenic electron hole pairs and inhibits the recombination of photogenic *** advantages result in the generation of more·O_(2)-and1O_(2)in the catalytic system,which increases the photocatalytic efficiency of nicotine degradation by ten ***,the degradation process of nicotine has been studied in this work to provide a basis for the degradation of nicotine organic pollutants in the air.

关键词： Photocatalytic g-C_(3)N_(4) Cyano group Catalytic fiber Nicotine degradation

Effects of nape acupuncture combined with swallowing rehabilitation on dysphagia in pseudobulbar palsy

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Journal of Traditional Chinese Medicine 2018年第1期38卷 117-124页

作者： Liu Xiaoping chen Feiyu chu Jiamei Bao Yehua Department of Acupuncture-Moxibustion and Rehabilitation Hangzhou Hospital of Traditional Chinese Medicine

OBJECTIVE: To evaluate the therapeutic effects of nape acupuncture combined with rehabilitative swallowing training for dysphagia caused by pseudobulbar palsy, and to compare it with rehabilitative swallowing training alone, and to observe the improvement in quality of life after the ***: One hundred patients were randomly divided into two groups: the rehabilitative swallowing training group(control group, n = 50) and the nape acupuncture combined with rehabilitative swallowing training group(experimental group,n = 50). Each group had 8 weeks' therapy, 5 times a week. Patients in the control group received rehabilitative swallowing training, while those in the experimental group received nape acupuncture therapy based on swallowing rehabilitation. The out-comes were assessed by the repetitive saliva-swallowing test(RSST), water swallow test(WST), standardized swallowing assessment(SSA), and a swallow quality-of-life questionnaire(SWAL-QOL). Correlations of onset age, onset frequency and lesion location with the efficacy of the acupuncture treatment were also ***: The scores for RSST, WST, and SSA in both groups were lower than before the therapy(P 0.05), but was related to onset age(P < 0.05) and onset frequency(P < 0.01).CONCLUSION: Nape acupuncture combined with rehabilitative swallowing training has an effect on dysphagia caused by pseudobulbar palsy and improves quality of life.

关键词： Deglutition disorders Pseudobulbar palsy Quality of life Age of onset Nape acupunc- ture Rehabilitative swallowing training

Enzyme-driven Nanorobots Walking Along Predesigned Tracks on the DNA Origami for Cargo Transport and Catalysis

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Chemical Research in Chinese Universities 2024年第2期40卷 333-342页

作者： NIE Cunpeng MA Tianran chen Tingting chu Xia State Key Laboratory of Chemo/Bio-Sensing and Chemometrics College of Chemistry and Chemical EngineeringHunan UniversityChangsha410082P.R.China

In molecular engineering,designing and synthesizing molecular machines with capable of performing complex tasks,remains a formidable *** is an excellent candidate for building molecular robots because it is highly ***,we present an artificial nanorobot,in which a DNA cube serves as the inert‘body’,and nucleic acid catalysts based on an enzymatic nicking reaction act as the‘legs’for *** nanorobot can execute a series of actions,such as‘start’,‘turn’,and‘stop’when it walks along a predefined *** performance could be confirmed and monitored by using an atomic force microscope(AFM)and fluorescence *** by biological machines,we artificially designed a series of specialized tasks that combined walking with control of cargo transport and ***-time fluorescence kinetics curves provide monitoring signals for cargo transport and catalytic *** work can enrich the toolbox of DNA machinery and has great potential for engineering molecular nanofactories.

关键词： DNA origami DNA nanorobot Controlled cargo transport DNAzyme catalysis

Preparation of Polylactide Composite with Excellent Flame Retardance and Improved Mechanical Properties

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Chinese Journal of Polymer Science 2018年第12期36卷 1385-1393页

作者： chu-Bo Sun Hong-Da Mao Feng chen Qiang Fu College of Polymer Science and Engineering Sichuan University State Key Laboratory of Polymer Materials Engineering

Despite the good biodegradable and mechanical properties, poly（lactic acid） still suffers from a highly inherent flammability, which restricts its applications in the electric and automobile fields. In order to improve the flame retardancy of PLA, in this work, melamine polyphosphate （MPP） and zinc bisdiethylphosphinate （ZnPi） were firstly incorporated into PLA, and the synergistic effect of them on flame retardance of PLA was investigated using limiting oxygen index （LOI）, UL-94 vertical measurement, scanning electron microscopy （SEM） and cone calorimeter tests etc. The results showed that PLA composite with 15 wt% of MPP/ZnPi （3：2） had the best flame-retardant efficiency with LOI value of 30.1 and V0 rating in UL-94 tests, which was far better than using MPP or ZnPi alone. What is more, although a wide range of flame retardants have been developed to reduce the flammability, so far, they normally compromise the mechanical properties of PLA. On the premise of maintaining good fiame-retardant performance, we improved the toughness of flame- retardant PLA composite, and the impact strength of flame-retardant PLA composite was more than tripled （8.08 kJ/m2） by adding thermoplastic urethanes （TPU）. This work offers an innovative method for the design of the unique integration of extraordinary flame retardancy and toughening reinforcement for PLA materials.

关键词： Synergistic effect Flame retardant Poly(lactic acid) Impact strength

(K_(0.5)Na_(0.5))Nb_(1-x)Ta_(x)O_(3)铁电性的第一性原理研究

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原子与分子物理学报 2025年第4期42卷 138-146页

作者：褚新建雷博程刘晨曦刘纪博新疆科技学院信息科学与工程学院库尔勒841000 新疆大学物理科学与技术学院新疆固体物理与器件重点实验室乌鲁木齐830046 西安工业大学光电工程学院西安710032

随着铅基陶瓷的大量使用,造成了严重的环境和健康问题,为了能够找寻替代铅基陶瓷的材料,人们开始了对无铅陶瓷材料的探索.(K_(0.5)Na_(0.5))NbO_(3)材料由于其优异的铁电压电性能,成为了无铅陶瓷材料的代表,但是碱性组分在高温下的高挥... 详细信息

随着铅基陶瓷的大量使用,造成了严重的环境和健康问题,为了能够找寻替代铅基陶瓷的材料,人们开始了对无铅陶瓷材料的探索.(K_(0.5)Na_(0.5))NbO_(3)材料由于其优异的铁电压电性能,成为了无铅陶瓷材料的代表,但是碱性组分在高温下的高挥发性使其应用范围受到了极大的限制.基于这样的考虑,本文基于密度泛函理论的第一性原理方法,探究了(K_(0.5)Na_(0.5))Nb_(1-x)TaxO_(3)(x=0.125,0.25,0.375,0.5,0.625,0.75,0.875,1)九种体系的铁电性能,结果表明:随着Ta浓度的增加,晶格常数发生了突变,由此猜测KNN材料随着Ta浓度的增加,发生了正交-单斜的相变;Ta的掺入能够降低KNN材料的烧结难度,且随着Ta浓度的增加,形成难度逐渐降低;掺杂体系中,Ta-4f轨道与Na-3p,K-4p以及O-2s轨道电子发生了杂化,使导带底Nb-4d与Na-3p电子的态密度峰向高能区移动,禁带宽度呈现增加的趋势;在分析KNN材料铁电性作用机理时发现KNN的铁电极化类型是离子位移型极化,且在[001]方向上不具有极化能力.分析掺杂后各个体系的极化强度,发现随着Ta浓度的增加,极化强度逐渐降低,但是在低浓度掺杂时极化有向上增加的趋势,这可能是体系在低浓存在着正交与单斜的准同型相界(Morphotropic phase boundary,MPB)导致的,由此可以判断,低浓度掺杂有利于提高KNN材料的铁电性能.

关键词：第一性原理钙钛矿结果 KNN 铁电性

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Secondary Phosphatization of the Earliest Cambrian Small Shelly Fossil Anabarites from Southern Shaanxi

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Journal of Earth Science 2016年第2期27卷 196-203页

作者： Yali chen Xuelei chu Xingliang Zhang Mingguo Zhai State Key Laboratory of Lithospheric Evolution Institute of Geology and Geophysics Chinese Academy of Sciences Beijing 100029 China University of Chinese Academy of Sciences Beijing 100049 China State Key Laboratory of Continental Dynamics Northwest University Xi' an 710069 China

Biomineralization may have an extremely long evolutionary history since the Paleoarchean, while the widespread biomineralization among metazoan lineages started at the earliest Cambrian. However, the primary mineralogy of Anabarites shell remains controversial. Optical microscopic observations combined with the Back-Scattered Electron（BSE） and Energy-Dispersive X-ray Spectroscopy（EDS） analyses are used to study the shell of the fossil Anabarites from the Kuanchuanpu fauna in southern Shaanxi Province in China, which is correlated to the Cambrian Fortunian Stage. The EDS analysis shows that the phosphorus-rich layer closely adjacent to the calcified layer exhibits a Ca： P： C ratio compositionally similar to the mineral fluorapatite（Ca_5（PO_4,CO_3）_3（F,CO_3）. The result that the calcified layer and the phosphorus-rich layer have different chemical compositions is consistent with the optical observation that there is an obvious gap between these two layers and the phosphorus-rich layer can extend to the phosphatic material inside of the tube, suggesting the phosphorus-rich layer doesn＇t belong to the original shell. We suggest that the phosphorous-rich layer is diagenetic in origin, precipitated as a result of phosphorus release during the decay of organic matter by microbes. Considering the outermost shell layer（OMS, biologically controlled carbonate shell layer） should display different isotopic information from the carbonate matrix（i.e., OMS is ^（12）C concentrated due to the biogenic organic matter template is readily rich in ^（12）C）, Nano SIMS was used to map ion distributions of C and N in the shell of Anabarites and matrix. However, ion images show that the concentration differences of ^（12）C, ^（13）C and ^（26）CN among the OMS and the matrix are unclear, while ^（12）C and ^（26）CN are supposed to be enriched in the OMS. Therefore, the minor isotopic differences between the shell and the matrix is hard to be detected by Nano SIMS, at least in our sample, probably due

关键词： biomineralization Anabarites Fortunian Stage phosphatization NanoSIMS southernShaanxi.