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Design of reduced Graphene Oxide based Piezo-resistive Type Acoustic Sensor on Flexible Kapton for Underwater Applications

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World Journal of Engineering and Technology 2019年第2期7卷 339-353页

作者： b. Smitha pai M. A. Goutham Veera Pandin Department of ECE Nitte Meenakshi Institute of Technology Bangalore India Department of ECE Adichunchanagiri Institute of Technology Chikmagalur India Centre for Nano Science and Engineering Indian Institute of Science (IISc) Bengaluru India

Micro Electro Mechanical Systems (MEMS) vector sensor is a recent advancement in the field of underwater acoustic sensors. The major incentive provided by this acoustic vector sensor is that it provides information about the direction of the incoming acoustic source signal in addition to the measurement of the pressure associated with the acoustic signal. We are reporting a design of a MEMS acoustic vector sensor for underwater applications using piezoresistive film of reduced Graphine Oxide (rGO), realized on kapton (polyimide) film as the starting material. The sensor is designed and fabricated by deposition of rGO on a kapton, which is a flexible substrate by the method of drop casting making the process simple, low-cost and scalable. The application of the piezoresistive transduction principle and ingenious structure of the vector sensor based on bionic principle improves miniaturization and the low-frequency sensitivity. The fabricated sensor shows a repeatable response in both static and dynamic conditions, to the applied strain due to the acoustic signal in a given direction. The experimental results show that fabricated sensor based on MEMS technology and piezoresistive effect is feasible and it possesses intrinsic two-dimensional directivity. The fabricated device has given good response for the low-frequency acoustic signals due to the effect of piezoresistive transduction principle and the resonance frequency of the device is found to be around 80 Hz with the displacement sensitivity around 3 mV/mm and 2 mV/mm of X and Y axis directions respectively.

关键词： Micro Electro Mechanical Systems (MEMS) reduced Graphine Oxide (rGO) Piezoresistive Acoustic Vector Sensor Plastic rod Microstructure

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Microstructure and mechanical properties of magnesium–lithium alloy prepared by friction stir processing

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rare Metals 2021年第9期40卷 2552-2559页

作者： Qian-Ying Che Kuai-She Wang Wen Wang Li-Ying Huang Tian-Qi Li Xiao-Peng Xi pai Peng Ke Qiao School of Metallurgical Engineering Xi’an University of Architecture and TechnologyXi’an 710055China National and Local Joint Engineering research Center for Functional Materials Processing Xi’an 710055China School of Materials Engineering Xi’an Aeronautical UniversityXi’an 710077China

In this study, the fine-grained Mg–Li alloy was prepared by friction stir processing(FSP). The microstructure and mechanical properties of the frictionstir-processed(FSPed) Mg–Li alloy were investigated. The result showed that FSP resulted in the grain refinement, and the average grain size of the b-Li phase was about 7.5 *** the a-Mg and b-Li phases, a small amount of Li_(3)Mg_(7), Li_(2)MgAl and AlLi phases were obtained. Compared with the base metal(bM), the weakening of the crystallographic texture occurred in the FSPed material,and the c-axis of the a-phase and the crystallographic orientation of the b-phase were tilted about 45°with respect to the transverse direction(TD). The average microhardness(HV 67.8) of the stir zone was higher than that of the bM(HV 61.5). The yield strength(YS) and the ultimate tensile strength(UTS) of the FSPed material were higher than those of the bM, while the elongation slightly reduced. Grain refinement had more significant effect on strength improvement compared with the texture variation for the FSPed material. The fracture surfaces of the bM and FSPed materials showed dimple characteristics.

关键词： Magnesium-lithium alloy Friction stir processing Grain size Grain orientation Mechanical property

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Spatial and temporal dynamics of pai forest vegetation in Pakistan assessed by rS and GIS

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Journal of Forestry research 2017年第3期28卷 593-603页

作者： A.A.Siyal A.G.Siyal r.b.Mahar U.S.-Pakistan Center for Advanced Studies in Water(USPCAS-W) Mehran University of Engineering and TechnologyJamshoroPakistan Department of Land and Water Management Sindh Agriculture UniversityTandojamPakistan

pai, an arid forest in Sindh Province of Pakistan, is important for the environmental, social, economic development and conservation of ecosystems of the province. Considering the significance of the forest for Sindh and the calls from the local population for its deforestation, we quantified the spatial and temporal variation in the vegetation of the forest and land surface temperature （LST） using optical and thermal Landsat satellite data. Our analysis of temporal （1987-2014） images with ArcGIS 10.1 revealed that the dense forest area was greatest at 725 ha （37 % of the total forest area） during 2013 while it was smallest at 217 ha （11%） in 1992. The sparse forest area peaked during 1987 at 1115 ha （58 %） under shrubs whereas it was smallest at 840 ha （43 %） in 1992, and the maximum deforestation of pai forest occurred during 1992. Spatial change in vegetation over a period of about 27 years （1987-2014） revealed that vegetation increased on an area of 735 ha （37 %）, decreased on 427 ha （22 %）, and there was no change on 808 ha （41%） of the forest. Variation in temperature between shaded （dense forest） and unshaded areas （bare land） of the forest was from 6 to 10 ℃. While the temperature difference between areas with sparse forest and bare land ranged from 4 to 6℃. An inverse relationship between LST and NDVI of pai forest with coefficients of determination of 0.944 and 0.917 was observed when NDVI was plotted against minimum and maximum LST, respectively. The vegetation in the forest increased with time and the areas of more dense pai forest supported lower surface temperature and thus air temperature.

关键词： Landsat Arid forest NDVI Deforestation Ecosystem Land surface temperature (LST)

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STUDIES ON CALCIUMSULPHOALUMINATE DICALCIUM SILICATE CLINKErS

STUDIES ON CALCIUMSULPHOALUMINATE DICALCIUM SILICATE CLINKER...

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第二届北京国际水泥及混凝土学术会议

作者： S. Krishnan r. K. Agarwal b.V.b. pai P.S. Parameswaran A.K. Chatterjee The Associated Cement Cos. Ltd. Central Research StationThane (India)

rESUME Major phases in the CaO - A12O3, - SiO2 - SO3 system, normally formed are C4 A3S. C12 A7, CA, C2S and CS. Within this system to obtain C4 A3S as the major phase along with C2S, raw mixes were designed and sintered In the temperature range of 1250-1350℃. The clinkers obtained were studied by microscopic and X-ray differaction techniques. both these studies confirmed the presence of C4 A3S as a major phase with dicalcium silicate (C2S). Properties of cement produced from these clinkers have been studied earlier. The present study involves the effect of uncombined lime in the clinkers at different levels and the influence of gypsum incorporated in the cement during cement grinding on hydraulic behaviour of the resultant cement. The properties of self levelling grouting composition made from such clinker is also reported.

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Increased immune escape of the new SArS-CoV-2 variant of concern Omicron

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Cellular & Molecular Immunology 2022年第2期19卷 293-295页

作者： Jie Hu pai Peng Xiaoxia Cao Kang Wu Juan Chen Kai Wang Ni Tang Ai-long Huang Key Laboratory of Molecular biology for Infectious Diseases(Ministry of Education) Institute for Viral HepatitisDepartment of Infectious Diseasesthe Second Affiliated HospitalChongqing Medical UniversityChongqingChina.

On 24 November,a new detected variant b.1.1.529 of SArS-CoV-2 by South Africa was reported to *** only 2 days,this variant was designated as“variant of concern”(VOC)and named as *** the past few weeks,Omicron had reported from more than 80 *** has been reported as the dominant SArS-CoV-2 in *** to the rapid spread of Omicron.A new wave of infection driven by Omicron is in progress.

关键词： immune infection Omi

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Three-dimensional numerical study of flow characteristics and membrane fouling evolution in an enzymatic membrane reactor

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Journal of Hydrodynamics 2018年第5期30卷 851-858页

作者： Xu-qu Hu pai-qing Wu Xing-yi Wang Hai-cheng Zhang Jian-quan Luo State Key Laboratory of Advanced Design and Manufacturing for Vehicle body College of Mechanical and Vehicle EngineeringHunan UniversityChangsha 410082China State Key Laboratory of biochemical Engineering Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China

In order to enhance the understanding of the membrane fouling mechanism, the hydrodynamics of the granular flow in a stirred enzymatic membrane reactor is numerically investigated in the present paper. A three-dimensional Euler-Euler model, coupled with the k-ε mixture turbulence model and the drag function proposed by Syamlal and O＇brien（1989） for the interphase momentum exchange, is built to simulate the two-phase（fluid-solid） turbulent flow. Numerical simulations of single-or two-phase turbulent flows at various stirring speeds are carried out. The numerical results agree very well with the published experimental data. results include the distributions of the velocity, the shear stress and the turbulent kinetic energy. It is shown that the increase of the stirring speed not only enlarges the circulation loops in the reactor, but also increases the shear stress on the membrane surface and accelerates the mixing process for the granular materials. The time evolution of the volumetric function of the granular materials on the membrane surface can qualitatively explain the evolution of the membrane fouling.

关键词： Turbulent flow multiphase flow membrane fouling

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Cambrian trilobite Ovatoryctocara granulata Tchernysheva,1962 and its biostratigraphic significance

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Progress in Natural Science:Materials International 2009年第2期19卷 213-221页

作者： Jinliang Yuan a,Yuanlong Zhao b,Jin Peng b,Xuejian Zhu a,Jih-pai Lin c a Nanjing Institute of Geology and Palaeontology,Chinese Academy of Sciences,East beijing road 39,Nanjing 210008,China b College of resource and Environment Science,Guizhou University,Guiyang 550003,China c School of Earth Sciences,Ohio State University,Columbus,OH 43210,USA Nanjing Institute of Geology and Palaeontology Chinese Academy of Sciences East Beijing Road 39 Nanjing 210008 China College of resource and Environment Science Guizhou University Guiyang 550003 China School of Earth Sciences Ohio State University Columbus OH 43210 USA

The genus Ovatoryctocara Tchernysheva,1962,and its key species Ovatoryctocara granulata Tchernysheva,1962,are revised. Ovatoryctocara granulata occurs near the base of the Ovatoryctocara Zone and ranges up into the lower portion of the Kounamkites Zone in the Siberian Platform. O. granulata also appears in southeastern Guizhou,South China,but O. granulata in northern Greenland may represent an indefinite species. Specimens of Ovatoryctocara from Newfoundland cannot be identified to species level. Specimens includ-ing two cranidia and three pygidia from the lower part of the Aoxi Formation at Yaxi Village,Shizhu Town,eastern Tongren,north-eastern Guizhou,were previously assigned to O. granulata,which is now reassigned as a new species O. yaxiensis sp. nov. It bears the following main features: glabella club-shaped,slightly expanded medially,with four pairs of lateral furrows,of which S1-S3 are trian-gular pits,S4 is shallow,connecting with axial furrow; shorter palpebral lobe situated a little anterior to the midway of facial suture across the fixigenae,longer posterolateral area (exsag.); semielliptical pygidium consisting of seven axial rings with a terminal piece and with eight pairs of marginal tips giving a sawtooth-like shape of the lateral margins in dorsal view. Although O. granulata is a widely distributed species,the FAD of O. granulata,for a global stage boundary,still has some disadvantages. First,its distribution is not as wide as that of Oryctocephalus indicus (reed,1910). Second,specimens of O. granulata are common only in Siberia. Third,the strati-graphic range of the species has not been studied in detail in all continents. Fourth,O. granulata is relatively small and easily affected by post-burial distortion. Last but not least,there exists obviously a facies change between the Ovatoryctocara Zone (lower Amgan Stage; deeper water facies) and the underlying Anabaraspis splendens Zone (Toyonian Stage; shallow water facies) in Siberian Platform. Nev-ert

关键词： Trilobites Ovatoryctocara granulata Tchernysheva,1962 Cambrian biostratigraphy

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滋阴明目方通过Akt/FoxO1/FasL通路抑制感光细胞凋亡治疗视网膜色素变性的机制研究

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湖南中医药大学学报 2024年第2期44卷 206-212页

作者：艾民李丹阳周派彭俊杨毅敬彭清华湖南中医药大学湖南长沙410208 湖南中医药大学第一附属医院湖南长沙410007

目的观察滋阴明目方对视网膜色素变性(retinitis pigmentosa,rP)小鼠视网膜组织中磷酸化蛋白激酶b(phosphorylated protein kinase b,p-Akt)、叉头框蛋白1(forkhead box transcription factor O1,FoxO1)以及凋亡相关因子配体(Fas ligand,FasL)表达的影响,探讨滋阴明目方抑制感光细胞凋亡的机制。方法将60只rd10小鼠随机分为模型组、滋阴明目方低剂量组[10 g/(kg·d)]、滋阴明目方中剂量组[20 g/(kg·d)]、滋阴明目方高剂量组[40 g/(kg·d)]、维生素A组[5 g/(kg·d)],每组12只;选取12只C57小鼠作为空白对照组(等量生理盐水),每组连续干预28 d。通过眼底照相观察小鼠眼底形态改变;进行视网膜电图检查并记录A波和b波振幅;HE染色观察病理形态学变化并测定外核层厚度;Western blot法检测小鼠视网膜组织p-Akt、FoxO1、FasL、半胱氨酸天冬氨酸特异性蛋白(cysteine aspartate-specific protease,Caspase)-3和Caspase-8蛋白表达。结果与空白对照组比较,模型组小鼠视盘苍白、变形,血管萎缩,视网膜电图的A波与b波振幅均降低(Pb波振幅、视网膜外核层厚度均明显升高(Pb波振幅、视网膜外核层厚度明显升高(Pb波振幅、视网膜外核层厚度均明显升高(Pb波振幅均明显降低(Pb波振幅、视网膜外核层厚度均明显降低(Prd10小鼠视网膜细胞的凋亡,保护视网膜结构和功能,延缓rP的进展。

关键词：视网膜色素变性滋阴明目方磷酸化蛋白激酶b 叉头框蛋白1 凋亡相关因子配体感光细胞细胞凋亡

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Improved blue quantum dot light-emitting diodes via chlorine passivated ZnO nanoparticle layer

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Chinese Physics b 2021年第11期30卷 141-145页

作者： Xiangwei Qu Jingrui Ma Siqi Jia Zhenghui Wu pai Liu Kai Wang Xiao-Wei Sun Key Laboratory of Energy Conversion and Storage Technologies(Ministry of Education) Southern University of Science and TechnologyShenzhen 518055China Guangdong University Key Laboratory for Advanced Quantum Dot Displays and Lighting Guangdong-Hong Kong-Macao Joint Laboratory for Photonic-Thermal-Electrical Energy Materials and DevicesShenzhen Key Laboratory for Advanced Quantum Dot Displays and Lightingand Department of Electrical and Electronic EngineeringSouthern University of Science and TechnologyShenzhen 518055China Shenzhen Planck Innovation Technology Pte.Ltd Liu-He RoadShenzhen 518173China

In blue quantum dot light emitting diodes(QLEDs),electron injection is insufficient,which would degrade device efficiency and ***,we employ chlorine passivated ZnO nanoparticles as electron transport layer to facilitate electron injection into QDs ***,it suppresses exciton quenching at the QD/ZnO interface by blocking charge transfer *** a result,the maximum external quantum efficiency of blue QLED was increased from 2.55%to 4.60%,and the operation lifetime of blue QLED was nearly 4 times longer than that of the control *** work indicates that election injection plays an important role in blue QLED efficiency and stability.

关键词： quantum dot light emitting diodes(QLEDs) chlorine passivation electron injection

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证素辨证在中医眼科的研究现状与未来发展策略

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湖南中医药大学学报 2024年第6期44卷 1085-1089页

作者：廖林丽邓颖李丹阳周派肖莉彭清华湖南中医药大学湖南长沙410208 湖南中医药大学中医诊断研究所湖南长沙410208 湖南中医药大学第一附属医院湖南长沙410007

证素辨证是中医学领域的研究热点,其作为目前统一传统辨证方法的最佳方式,深受临床的青睐。现阶段,证素辨证在中医眼科的运用已有相关探索,并取得了一定的进展。阐述证素辨证的实质与内涵,系统梳理证素辨证在中医眼科理论研究、临床运... 详细信息

证素辨证是中医学领域的研究热点,其作为目前统一传统辨证方法的最佳方式,深受临床的青睐。现阶段,证素辨证在中医眼科的运用已有相关探索,并取得了一定的进展。阐述证素辨证的实质与内涵,系统梳理证素辨证在中医眼科理论研究、临床运用、文献研究中取得的阶段性进展,分析证素辨证在中医眼科运用中存在的问题,认为证素辨证在中医眼科的未来发展要从理论研究、临床运用、文献研究、数字化发展4个方面开展,并针对性提出具体的研究策略,以期促进证素辨证在中医眼科的运用,推动中医眼科专科辨证体系的建设。

关键词：证素辨证中医眼科研究现状研究策略

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