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Effect of electropulsing on austenite to ferrite transformation in low-carbon steel

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Journal of Iron and Steel Research International 2021年第4期28卷 437-444页

作者： Zheng-hai zhu Li Zhou Fei He Xiao-fang Shi Li-zhong Chang hai-jun Wang Hong-biao Dong School of Metallurgic Engineering Anhui University of TechnologyMaanshan 243002AnhuiChina School of Engineering University of LeicesterLeicester LE17RHUK

We explore the application of electropulsing for the control of phase transformation in a low-carbon *** effect of electropulsing on the transformation from austenite to ferrite in continuous casting low-carbon steel slab has been studied through experimental and thermodynamic *** results reveal that electropulsing promotes the precipitation of ferrite within austenite grain in the low-carbon *** the electropulsing intensity increases,the precipitation of ferrite increases within austenite grains,and ferrite omentum precipitates become thinner along the austenite grain *** results provide a basis for controlling the austenite to ferrite transformation in low-carbon steel.

关键词： Electropulsing Austenite Ferrite Transformation Nucleation Low-carbon steel

Explicit and Exact Solutions to N-Order Schrodinger System via an Extended Mapping Approach

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Communications in Theoretical Physics 2006年第3期45卷 483-486页

作者： zhu hai-Ping ZHENG Chun- Long FANG Jian-Ping Department of Physics Zhejiang Lishui University Lishui 323000 China Shanghai Institute of Applied Mathematics and Mechanics Shanghai University Shanghai 200072 China

In this paper, we extend the mapping approach to the N-order Schrodinger equation. In terms of the extended mapping approach, new families of variable separation solutions with some arbitrary functions are derived.

关键词： extended mapping approach SchrSdinger equation exact solution

Exact Solution to （1＋1）-Dimensional Higher-Order Schrodinger Equation via an Extended Mapping Approach

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Communications in Theoretical Physics 2006年第1期45卷 127-130页

作者： zhu hai-Ping ZHENG Chun-Long FANG Jian-Ping Department of Physics Zhejiang Lishui University Lishui 323000 China Shanghai Institute of Applied Mathematics and Mechanics Shanghai University Shanghai 200072 China

Starting from a special variable transformation and with the help of an extended mapping approach, the high-order Schrodinger equation （n = 3, 4） is solved. A new family of variable separation solutions with arbitra... 详细信息

关键词： extended mapping approach Schrodinger equation exact solution

Synthesis and Crystal Structure of a Genistein-derived Compound

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Chinese Journal of Structural Chemistry 2008年第2期27卷 200-204页

作者： ZHANG Li-N SHI Lei FANG Rui-Qin zhu hai-Liang School of Life Sciences Nanjing University Nanjing 210093 China

A genistein derivative, 5-hydroxy-3-（4-hydroxyphenyl）-7-（2-（piperidin- 1-yl）ethoxy）- 4H-chromen-4-one 3, was designed, prepared and structurally characterized by single-crystal X-ray diffraction. X-ray structure analysis reveals that 3 crystallizes in the orthorhombic system, space group Pbca, with a = 16.238（3）, b = 10.308（2）, c = 22.987（5）A, V = 3847.6（13）A3, Z = 8,μ= 0.093 mm^-1, Dc = 1.317 g/cm^3, F（000） = 1616, R = 0.0789 and wR = 0.1554 for 1463 observed reflections with I 〉 2σ（I）.

关键词： genistein crystal structure derivative 1,2-dibromoethane piperidine

Robust and Passive Motion Detection with COTS WiFi Devices

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Tsinghua Science and Technology 2017年第4期22卷 345-359页

作者： hai zhu Fu Xiao Lijuan Sun Xiaohui Xie Panlong Yang Ruchuan Wang the College of Computer Nanjing University of Posts and Telecommunications the Jiangsu High Technology Research Key Laboratory for Wireless Sensor Networks Key Lab of Broadband Wireless Communication and Sensor Network Technology of Ministry of Education and College of Computer Nanjing University of Posts and Telecommunications the College of Computer Science and Technology University of Science and Technology of China

Device-free Passive（DfP） detection has received increasing attention for its ability to support various pervasive applications. Instead of relying on variable Received Signal Strength（RSS）, most recent studies rely on finer-grained Channel State Information（CSI）. However, existing methods have some limitations, in that they are effective only in the Line-Of-Sight（LOS） or for more than one moving individual. In this paper, we analyze the human motion effect on CSI and propose a novel scheme for Robust Passive Motion Detection（R-PMD）. Since traditional low-pass filtering has a number of limitations with respect to data denoising, we adopt a novel Principal Component Analysis（PCA）-based filtering technique to capture the representative signals of human motion and extract the variance profile as the sensitive metric for human detection. In addition, existing schemes simply aggregate CSI values over all the antennas in MIMO systems. Instead, we investigate the sensing quality of each antenna and aggregate the best combination of antennas to achieve more accurate and robust detection. The R-PMD prototype uses off-the-shelf WiFi devices and the experimental results demonstrate that R-PMD achieves an average detection rate of 96.33% with a false alarm rate of 3.67%.

关键词： device-free passive detection Received Signal Strength(RSS) channel state information MIMO

Joint frequency-phase estimation for pilot-limited communication systems: a novel method based on length-variable auto-correlation operator

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Science China(Information Sciences) 2020年第6期63卷 247-249页

作者： Hengzhou XU Wenjing WEI Bo ZHANG Mengmeng XU hai zhu School of Network Engineering Zhoukou Normal University

Dear editor,Wireless communication systems, such as the fifth-generation (5G), unmanned aircraft vehicle,have widespread applications in our modern society [1–4]. This case will significantly decline available spectrum resources, thereby requiring us to provide some solutions. This study proposes a novel method for providing joint frequency-phase estimation for pilot-limited communication systems.

关键词： a novel method based on length-variable auto-correlation operator Joint frequency-phase estimation for pilot-limited communication systems

Proppant transport in rough fracture networks using supercritical CO_(2)

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Petroleum Science 2024年第3期21卷 1852-1864页

作者： Yong Zheng Meng-Meng Zhou Ergun Kuru Bin Wang Jun Ni Bing Yang Ke Hu hai Huang hai-zhu Wang School of Petroleum Engineering Xi'an Shiyou UniversityXian710065ShaanxiChina Shaanxi Key Laboratory of Carbon Dioxide Sequestration and Enhanced Oil Recovery Xi'an710075ShaanxiChina State Key Laboratory of Petroleum Resources and Engineering China University of Petroleum(Beijing)Beijing2249China School of Mining and Petroleum Engineering University of AlbertaEdmontonTG2W2AlbertaCanad Shaanxi Yanchang Petroleum(Group)Co. Ltd.Xi'an710075ShaanxiChina

Proppant transport within fractures is one of the most critical tasks in oil,gas and geothermal reservoir stimulation,as it largely determines the ultimate performance of the operating *** transport in rough fracture networks is still a relatively new area of research and the associated transport mechanisms are still *** this study,representative parameters of rough fracture surfaces formed by supercritical CO_(2) fracturing were used to generate a rough fracture network model based on a spectral synthesis *** fluid dynamics(CFD)coupled with the discrete element method(DEM)was used to study proppant transport in this rough fracture *** reveal the turning transport mechanism of proppants into branching fractures at the intersections of rough fracture networks,a comparison was made with the behavior within smooth fracture networks,and the effect of key pumping parameters on the proppant placement in a secondary fracture was *** results show that the transport behavior of proppant in rough fracture networks is very different from that of the one in the smooth fracture *** turning transport mechanisms of proppant into secondary fractures in rough fracture networks are gravity-driven sliding,high velocity fluid suspension,and fracture structure *** the same injection conditions,supercritical CO_(2)with high flow Reynolds number still has a weaker ability to transport proppant into secondary fractures than *** of the supercritical CO_(2)needs to be increased beyond a certain value to have a significant effect on proppant carrying,and under the temperature and pressure conditions of this paper,it needs to be increased more than 20 times(about 0.94 m Pa s).Increasing the injection velocity and decreasing the proppant concentration facilitates the entry of proppant into the branching fractures,which in turn results in a larger stimulated reservoir *** results help to understand the pro

关键词： Reservoir stimulation CCUS Rough fracture network Supercritical CO_(2) Proppanttransport

^(18)F-DG PET/CT in detection of recurrence and metastasis ofcolorectal cancer

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World Journal of Gastroenterology 2007年第37期13卷 5025-5029页

作者： Long-Bang Chen Jin-Long Tong hai-zhu Song Hong zhu Yu-Cai Wang Department of Medical Oncology Jinling Hospital Schoolof Medicine Nanjing University Nanjing 210002 JiangsuProvince China Department of Nuclear Medicine Jinling HospitalSchool of Medicine Nanjing University Nanjing 210002 JiangsuProvince China

AIM: To evaluate the value of 18F-DG PET/CT in detecting recurrence and/or metastasis of colorectal cancer (CRC). METHODS: Combined visual analysis with semiquantitative analysis, the 18F-DG PET/CT whole- body imaging results and the corresponding clinical data of 68 postoperative CRC patients including 48 male and 20 female with average age of 58.1 were analyzed retrospectively. RESULTS: Recurrence and/or metastasis were confirmed in 56 patients in the clinical follow-up after the PET/CT imaging. The sensitivity of PET/CT diagnosis of CRC recurrence and/or metastasis was 94.6%, and the specificity was 83.3%. The positive predictive value (PPV) was 96.4% and the negative predictive value (NPV) was 76.9%. PET/CT imaging detected one or more occult malignant lesions in 8 cases where abdominal/pelvic CT and/or ultrasonography showed negative findings, and also detected more lesions than CT or ultrasonography did in 30.4% (17/56) cases. Recurrence and/or metastasis was detected in 91.7% (22/24) cases with elevated serum CEA levels by 18F-DG PET/CT imaging. CONCLUSION: 18F-DG PET/CT could detect the recurrence and/or metastasis of CRC with high sensitivity and specificity.

关键词： Colorectal cancer Recurrence Metastasis Positron emission tomography Computed tomography

Synthesis of Mg_2B_2O_5 whiskers via coprecipitation and sintering process

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International Journal of Minerals,Metallurgy and Materials 2012年第10期19卷 969-972页

作者： Dong-hai zhu Xue-ying Nai Cheng-cai zhu Feng-qin Guo Shao-ju Bian Wu Li Qinghai Institute of Salt Lakes Chinese Academy of Sciences Xining 810008 China Graduate University of Chinese Academy of Sciences Beijing 100049 China Department o f Basin Education Qinghai University Xining 810016 China

Mg2B2O5 whiskers with high aspect ratio were synthesized by coprecipitation and sintering process using MgCl2-6H2O, H3BO3, and NaOH as raw materials and KCl as a flux. Their formation process was investigated by thermogravimetry and differential scanning calo- rimetry （TG-DSC）, X-ray diffraction （XRD）, and scanning electron microcopy （SEM）. It is found that the products synthesized at 832℃ are monoclinic Mg2B205 whiskers with a diameter of 200-400 nm and a length of 50-80 μm. Transmission electron microscopy （TEM） and selected area electron diffraction （SAED） analyses show that the whiskers obtained at 832℃ are single crystalline and grow along with the [010] direction. The growth mechanism of Mg2B2O5 whiskers was also presented.

关键词： magnesium borate coprecipitation sintering crystal whiskers crystal growth microstructure