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Enhanced Cryogenic Magnetocaloric Effect Induced by Small Size GdNi_5 Nanoparticles

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Journal of Materials Science & Technology 2014年第10期30卷 973-978页

作者： Jun li Song Ma Han Wang Wenjie Gong Jingjing Jiang shaojie li Yong Wang Dianyu Geng Zhidong Zhang Shenyang National Laboratory for Materials Science Institute of Metal Researchand International Centre for Materials PhysicsChinese Academy of Sciences

GdNi5 nanoparticles and GdNis/Gd2O3 nanocapsules （with GdNi5 core and Gd2O3 shell） were prepared by arcdischarge technique under different hydrogen partial pressure. The GdNi5 nanoparticles show irregular spherical shape and have a size distribution of 10-50 nm with an average diameter of 15 nm. In comparison, the GdNi5/Gd2O3 nanocapsules present spherical morphology and show a size distribution of 10-100 nm with an average diameter of 60 nm. Under a magnetic field change of 50 kOe, the maximum magnetic entropy change of GdNi5 nanoparticles is 13.5 J/（kg K） at 5 K, while the corresponding value of the GdNis/Gd2O3 nanocapsuels is only 5.7 J/（kg K） at 31 K. The origin of the large magnetic entropy change of GdNi5 nanoparticles is ascribed to its high atomic moments and small anisotropy energy barrier induced by its small particle size.

关键词： Nanoparticle Superparamagnetic property Cryogenic refrigeration Magnetocaloric effect Nanocapsule

Optimization of a High-pressure Water-Powder Mixing Prototype for Offshore Platforms

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Fluid Dynamics & Materials Processing 2022年第3期18卷 537-548页

作者： Shu Zheng Yang Yaln Shuyu liu Mingxuan Xia shaojie li State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum UniversityChengdu610500China School of Petroleum and Natural Gas Engineering Southwest Petroleum UniversityChengdu610500China Research Institute of Shaanxi Yanchang Petroleum(Group)Co. Ltd.Xi’an710000China

A new device is designed to promote the mixing of high-pressure water jets and powders in typical industrial *** water and powder mixing devices traditionally used on offshore platforms are detrimentally affected by the geometrical configuration of the water nozzle and the powder spraying pipe,which are parallel,resulting in small intersecting volumes of liquid and *** allowing the related jets to intersect,in the present work the optimal horizontal distance,vertical distance and intersection angle are determined through a parametric *** is also shown that such values change if the number of water layers is increased from one to *** such a case,the water and powder intersection volume can be greatly increased because the trajectory of the dry powder particles becomes more chaotic.

关键词： Polymer high pressure jet forced hydration

Effects of high temperature annealing and laser irradiation on activation rate of phosphorus

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Journal of Semiconductors 2020年第12期41卷 84-89页

作者： shaojie li Peide Han Institute of Semiconductors Chinese Academy of SciencesBeijing 100083China University of Chinese Academy of Sciences Beijing 100049China

Thermal annealing and laser irradiation were used to study the activation rate of phosphorus in silicon after ion *** activation rate refers to the ratio of activated impurity number to the total impurity number in the *** injecting phosphorus with the dose and energy(energy=55 keV,dose=3×10^(15) cm^(-2)),the samples were annealed at different temperatures,and laser irradiation experiments were performed after *** experimental results showed that the activation rate of phosphorus was the highest at 850℃,and the highest activation rate was 67%.Upon femtosecond laser irradiation samples after thermal annealing,while keeping the crystalline silicon surface without damage,the activation rate was *** the energy-flux density of the femtosecond laser was 0.65 kJ/cm2,the activation rate was the highest,increasing from 67%to 74.81%.

关键词： thermal annealing ion implantation femtosecond laser activation rate

Joint learning based on multi-shaped filters for knowledge graph completion

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High Technology Letters 2021年第1期27卷 43-52页

作者： li shaojie Chen Shudong Ouyang Xiaoye Gong lichen School of Microelectronics University of Chinese Academy of SciencesBeijing 100049P.R.China Institute of Microelectronics Chinese Academy of SciencesBeijing 100029P.R.China

To solve the problem of missing many valid triples in knowledge graphs(KGs),a novel model based on a convolutional neural network(CNN)called ConvKG is proposed,which employs a joint learning strategy for knowledge graph completion(KGC).Related research work has shown the superiority of convolutional neural networks(CNNs)in extracting semantic features of triple ***,these researches use only one single-shaped filter and fail to extract semantic features of different *** solve this problem,ConvKG exploits multi-shaped filters to co-convolute on the triple embeddings,joint learning semantic features of different *** shaped filters cover different sizes on the triple embeddings and capture pairwise interactions of different granularity among triple *** results confirm the strength of joint learning,and compared with state-of-the-art CNN-based KGC models,ConvKG achieves the better mean rank(MR)and Hits@10 metrics on dataset WN18 RR,and the better MR on dataset FB15k-237.

关键词： knowledge graph embedding(KGE) knowledge graph completion(KGC) convolutional neural network(CNN) joint learning multi-shaped filter

IDENTIFICATION OF INPAINTED IMAGES AND NATURAL IMAGES FOR DIGITAL FORENSICS

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Journal of Electronics(China) 2009年第3期26卷 341-345页

作者： Wu Qiong Sun shaojie Zhu Wei li Guohui College of Information System and Management National University of Defense Technology Changsha 410073 China

Image forensics is a form of image analysis for finding out the condition of an image in the complete absence of any digital watermark or *** can be used to authenticate digital images and identify their *** the technology of exemplar-based inpainting provides an approach to remove objects from an image and play visual *** this paper, as a first attempt, a method based on zero-connectivity feature and fuzzy membership is proposed to discriminate natural images from inpainted ***, zero-connectivity labeling is applied on block pairs to yield matching degree feature of all blocks in the region of suspicious, then the fuzzy memberships are computed and the tampered regions are identified by a cut *** results demonstrate the effectiveness of our method in detecting inpainted images.

关键词： Image authentication Image inpainting Fuzzy membership

pyrG is required for maintaining stable cellular uracil level and normal sporulation pattern under excess uracil stress in Aspergillus nidulans

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Science China(life Sciences) 2013年第5期56卷 467-475页

作者： SUN XianYun ZHU JuFen BAO li HU ChengCheng JIN Cheng HARRIS Steven D. liU HongWei li shaojie State Key Laboratory of Mycology Institute of MicrobiologyChinese Academy of Sciences Department of Plant Pathology University of Nebraska-LincolnLincolnNebraska 68588-0660USA

Tight control of the intracellular uracil level is believed to be important to reduce the occurrence of uracil incorporation into DNA. The pyrG gene ofAspergillus niduIans encodes orotidine 5＇-phosphate decarboxylase, which catalyzes the conversion of orotidine monophosphate （OMP） to uridine monophosphate （UMP）. In this study, we found that pyrG is critical for maintaining uracil at a low concentration in A. nidulans cells in the presence of exogenous uracil. Excess uracil and its derivatives had a stronger inhibitory effect on the growth of the pyrG89 mutant with defective OMP decarboxylase activity than on the growth of wild type, and induced sexual development in the pyrG89 mutant but not in wild type. Analysis of transcriptomic responses to excess uracil by digital gene expression profiling （DGE） revealed that genes related to sexual development were transcrip- tionally activated in the pyrG89 mutant but not in wild type. Quantitative analysis by HPLC showed that the cellular uracil level was 6.5 times higher in the pyrG89 mutant than in wild type in the presence of exogenous uracil. This study not only provides new information on uracil recycling and adaptation to excess uracil but also reveals the potential effects of OMP decarboxylase on fungal growth and development.

关键词： orotidine 5'-phosphate decarboxylase stress uracil sexual development

Interface evolution in the platelet-like SiC@C and SiC@ SiO2 monocrystal nanocapsules

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Nano Research 2017年第8期10卷 2644-2656页

作者： Jian Gao Jieyi Yu Lei Zhou Javid Muhammad Xinglong Dong Yinong Wang Hongtao Yu Xie Quan shaojie li Youngguan Jung Key Laboratory of Materials Modification by Laser Ion and Electron Beams (Ministry of Education) School of Materials Science and Engineering Dalian University of Technology Dalian 115023 China Key Laboratory of Industrial Ecology and Environmental Engineering (Ministry of Education) School of Environmental Science and Technology Dalian University of Technology Dalian 116024 China InstrumentalAnalysis and Research Center Dalian University of Technology Panjin 124221 China Department of Mechanical Engineering Kumoh National Institute of Technology Daeharkro 53 Gumi Gyeong-Buk 730-701 Republic of Korea

Carbon-coated SiC@C nanocapsules （NCs） with a hexagonal platelet-like morphology were fabricated by a simple direct current （DC） arc-discharge plasma method. The SiC@C NCs were monocrystalline, 120-150 nm in size, and approximately 50 nm thick. The formation of the as-prepared SiC@C NCs included nucleation of truncated octahedral SiC seeds and subsequent anisotropic growth of the seeds into hexagonal nanoplatelets in a carbon-rich atmosphere. The disordered carbon layers on the SiC@C NCs were converted into SiO2 shells of SiC@SiO2 NCs by heat treatment at 650 ℃ in air, during which the shape and inherent characteristics of the crystalline SiC core were obtained. The interface evolution from carbon to SiO2 shells endowed the SiC@SiO2 NCs with enhanced photocatalytic activity due to the hydrophilic and transparent nature of the SiO2 shell, as well as to the photosensitive SiC nanocrystals. The band gap of the nanostructured SiC core was determined to be 2.70 eV. The SiC@SiO2 NCs degraded approximately 95% of methylene blue in 160 min under visible light irradiation.

关键词： silicon carbide silicon oxide nanocapsule monocrystal photocatalyst

Do Supercontinent-Superplume Cycles Control the Growth and Evolution of Continental Crust?

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Journal of Earth Science 2020年第10期31卷 1142-1169页

作者： Xuan-Ce Wang Simon A.Wilde Zheng-Xiang li shaojie li linlin li School of Earth Sciences Yunnan UniversityKunming 650500China School of Earth Science and Resources Chang'an UniversityXi'an 710054China ARC Centre of Excellence for Core to Crust Fluid Systems(CCFS)and The Institute for Geoscience Research(TIGeR) Department of Applied GeologyCurtin UniversityPerth WA 6845Australia

The evolution of continental crust can be directly linked to the first-order supercontinent-superplume *** demonstrate that:(1)a mantle-like oxygen isotopic signature is not a diagnostic feature for distinguishing crustal addition from the reworking of pre-existing continental crust;(2)juvenile continental crust shows a wide range of whole-rock Hf isotopic compositions throughout Earth's history;and(3)detrital zircon Hf model ages cannot reliably determine the growth of continental ***,the wide use of zircon Hf model ages,based on zircon grains with mantle-like oxygen isotopes,is inappropriate for estimating the timing of continental crustal *** on an analysis of global Hf and O isotope and zircon age databases,we argue that the actual U-Pb crystallization ages of juvenile zircon grains provide the best opportunity to unravel crustal growth through time and to test its relationship with supercontinent-superplume ***,when the Hf isotopes of these juvenile grains plot within the field of juvenile continental crust,they correlate well with times of global mantle depletion as recorded by Os and He isotopes,plume activity as recorded by liP events,and periods of crustal growth and the breakup of *** contrast,zircon grains crystallized from magmas that were produced by partial melting of pre-existing continental crust show U-Pb age peaks that correspond mainly to times of supercontinent assembly and crustal *** analysis shows the key role played by recycling of mafic crustal components in the generation of juvenile continental crust.

关键词： zircon age zircon Hf-O isotopes slab melting juvenile crust formation episodic continental crustal growth supercontinent-superplume cycles

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Energy band adjustment of 808 nm GaAs laser power converters via gradient doping

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Journal of Semiconductors 2021年第3期42卷 73-79页

作者： Yingjie Zhao Shan li Huixue Ren shaojie li Peide Han State Key Laboratory of Integrated Optoelectronics Institute of SemiconductorsChinese Academy of SciencesBeijing 100083China School of Electronic Electrical and Communication EngineeringUniversity of Chinese Academy of SciencesBeijing 100049China

The gradient doping regions were employed in the emitter layer and the base layer of GaAs based laser power converters(LPCs).Silvaco TCAD was used to numerically simulate the linear gradient doping and exponential gradient doping structure,and analyze the transport process of photogenerated *** band adjustment via gradient doping improved the separation and transport efficiency of photogenerated carriers and reduced the total recombination rate of GaAs *** with traditional structure of LPCs,the photoelectric conversion efficiency of LPCs with linear and exponential gradient doping structure were improved from 52.7%to 57.2%and 57.7%,respectively,under 808 nm laser light at the power density of 1 W/cm^(2).

关键词： gradient doping laser power converters(LPCs) energy band adjustment numerical simulation