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Influence Factors of Aluminum–Slag Interfacial Reaction Under Electric Field

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Acta Metallurgica Sinica(English Letters) 2017年第8期30卷 753-761页

作者： xin-Yu Lv An-Ping Dong jun Wang Da Shu Bao-De sun Shanghai Key Laboratory of Advanced High-Temperature Materials and Precision Forming Shanghai Jiao TongUniversity Shanghai 200240 China

The interfacial reaction between aluminum melt and molten slag under an electric field plays a significant role in aluminum electro-slag refining. Here we studied this interracial reaction within 680 and 820 ℃ under an electric field between 0 and 9 V. The evolution of aluminum composition was analyzed by inductively coupled plasma atomic emission spectroscopy. The dominant factor during the interfacial reaction was identified through orthogonal experiments, in which the slag-to-aluminum mass ratio, initial silicon concentration, electric voltage, reaction time, and temperature were selected as the influence factors. The greatest influence factor on the interracial reaction was found to be the reaction time. Also, single-factor experiments revealed that the reaction kinetic processes largely obeyed an irreversible kinetic model, and the silicon removal efficiency was enhanced by increasing the voltage and slag/metal ratio.

关键词： Molten salts Interfacial reaction Silicon Electric field Aluminum Kinetic model

Generative API usage code recommendation with parameter concretization

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Science China(Information Sciences) 2019年第9期62卷 51-72页

作者： Chi CHEN xin PENG jun sun Zhenchang xinG xin WANG Yifan ZHAO Hairui ZHANG Wenyun ZHAO School of Computer Science Fudan University Shanghai Key Laboratory of Data Science Fudan University Pillar of Information System Technology and Design Singapore University of Technology and Design Research School of Computer Science Australian National University

Many programming languages and development frameworks have extensive libraries(e.g., JDK and Android libraries) that ease the task of software engineering if used effectively. With numerous library classes and sometimes intricate API(application programming interface) usage constraints, programmers often have difficulty remembering the library APIs and/or using them correctly. This study addresses this problem by developing an engine called DeepAPIRec, which automatically recommends the API usage *** to the existing proposals, our approach distinguishes itself in two ways. First, it is based on a tree-based long short-term memory(LSTM) neural network inspired by recent developments in the machinelearning community. A tree-based LSTM neural network allows us to model and reason about variable-length,preceding and succeeding code contexts, and to make precise predictions. Second, we apply data-flow analysis to generate concrete parameters for the API usage code, which not only allows us to generate complete code recommendations but also improves the accuracy of the learning results according to the tree-based LSTM neural network. Our approach has been implemented for supporting Java programs. Our experimental studies on the JDK library show that at statement-level recommendations, DeepAPIRec can achieve a top-1 accuracy of about 37% and a top-5 accuracy of about 64%, which are significantly better than the existing approaches. Our user study further confirms that DeepAPIRec can help developers to complete a segment of code faster and more accurately as compared to IntelliJ IDEA.

关键词： code recommendation API deep learning data dependency parameter concretization

Magnetic-activated cell sorting of nonapoptotic spermatozoa with a high DNA fragmentation index improves the live birth rate and decreases transfer cycles of IVF/ICSI

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Asian Journal of Andrology 2022年第4期24卷 367-372页

作者： Jie Mei Lin-jun Chen xin-xin Zhu Wen Yu Qing-Qiang Gao Hai-Xiang sun Li-jun Ding jun-Xia Wang Center for Reproductive Medicine Department of Obstetrics and GynecologyNanjing Drum Tower HospitalThe Affiliated Hospital of Nanjing University Medical SchoolNanjing 210008China Center for Molecular Reproductive Medicine Nanjing UniversityNanjing 210008China Department of Andrology Nanjing Drum Tower HospitalThe Affiliated Hospital of Nanjing University Medical SchoolNanjing 210008China Clinical Center for Stem Cell Research The Affiliated Drum Tower Hospital of Nanjing University Medical SchoolNanjing 210008China

The present study aimed to evaluate the clinical outcomes of magnetic-activated cell sorting(MACS)in sperm preparation for male subjects with a sperm DNA fragmentation index(DFI)≥30%.A total of 86 patients who had undergone their first long-term long protocol were *** protocol involved in vitro fertilization(IVF)and intracytoplasmic sperm injection(ICSI)cycles,and the patients were divided into the MACS or control *** MACS group included sperm samples analyzed with MACS that were combined with density gradient centrifugation(DGC)and the swim-up(SU)technique(n=39),and the control group included sperm samples prepared using standard techniques(DGC and SU;n=41).No differences were noted with regard to basic clinical characteristics,number of oocytes retrieved,normal fertilization rate,cleavage rate,or transplantable embryo rate between the two groups in IVF/*** addition,the clinical pregnancy and implantation rates of the first embryo transfer cycles indicated no significant differences between the two ***,there was a tendency to improve the live birth rate(LBR)of the first embryo transfer cycle(63.2%vs 53.9%)and the cumulative LBR(79.5%vs 70.7%)in the MACS group compared with the control ***,the number of transferred embryos(mean±standard deviation[s.d.]:1.7±0.7 vs 2.3±1.6)and the transfer number of each retrieved cycle(mean±s.d.:1.2±0.5 vs 1.6±0.8)were significantly lower in the MACS group than those in the control ***,the selection of nonapoptotic spermatozoa by MACS for higher sperm DFI could improve assisted reproductive clinical outcomes.

关键词： cumulative live birth rate fertility rate intracytoplasmic sperm injection sperm DNA fragmentation index sperm DNA integrity

Dominant woody plant species recognition with a hierarchical model based on multimodal geospatial data for subtropical forests

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Journal of Forestry Research 2024年第3期35卷 111-130页

作者： xin Chen Yujun sun State Forestry&Grassland Administration Key Laboratory of Forest Resources&Environmental Management Beijing Forestry UniversityBeijing 100083People's Republic of China

Since the launch of the Google Earth Engine(GEE)cloud platform in 2010,it has been widely used,leading to a wealth of valuable ***,the potential of GEE for forest resource management has not been fully *** extract dominant woody plant species,GEE combined Sen-tinel-1(S1)and Sentinel-2(S2)data with the addition of the National Forest Resources Inventory(NFRI)and topographic data,resulting in a 10 m resolution multimodal geospatial dataset for subtropical forests in southeast *** and texture features,red-edge bands,and vegetation indices of S1 and S2 data were computed.A hierarchical model obtained information on forest distribution and area and the dominant woody plant *** results suggest that combining data sources from the S1 winter and S2 yearly ranges enhances accuracy in forest distribution and area extraction compared to using either data source ***,for dominant woody species recognition,using S1 winter and S2 data across all four seasons was *** terrain factors and removing spatial correlation from NFRI sample points further improved the recognition *** optimal forest extraction achieved an overall accuracy(OA)of 97.4%and a maplevel image classification efficacy(MICE)of 96.7%.OA and MICE were 83.6%and 80.7%for dominant species extraction,*** high accuracy and efficacy values indicate that the hierarchical recognition model based on multimodal remote sensing data performed extremely well for extracting information about dominant woody plant *** the results using the GEE application allows for an intuitive display of forest and species distribution,offering significant convenience for forest resource monitoring.

关键词： Google Earth Engine Sentinel Forest resource inventory data Dominant woody plant species Subtropics Model performance

Inhibition of wax crystallization and asphaltene agglomeration by core-shell polymer@SiO2 hybride nano-particles

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Petroleum Science 2024年第5期21卷 3621-3629页

作者： xin-Yuan Li Xu-Biao Zhang Si-Bei Li Li-Wei Hui xin-Jie sun jun Xu Sino Oil King Shine Chemical Co. Ltd. School of Chemical Engineering East China University of Science and Technology Large Industrial Reactor Engineering Research Center of Ministry of Education East China University of Science and Technology

The gelation of crude oil with high wax and asphaltene content at low temperatures often results in the block of transportation pipeline in Africa. In recent years, it was reported that surface hydrophobicmodified nanoparticles have important applications in crude oil flow modification. In this work, four kinds of core-shell hybride nanoparticles by grafting poly（octadecyl, docosyl acrylate） and poly（acrylate-α-olefin） onto the surface of nano-sized SiO2were synthesized by grafting polymerization *** chemical structure of nanoparticles was analyzed by Fourier transform infrared spectroscopy（FT-IR）,scanning electron microscopy（SEM） and thermogravimetric analysis（TGA）. The rheological behaviors of crude oil and precipitation of asphaltenes in the presence of nanoparticles were studied by measuring the viscose-temperature relationship curve, the cumulative wax precipitation amount, and morphology of waxes and asphaltenes. The results indicate that the docosyl polyacrylate@SiO2nanoparticle（PDA@SiO2） can reduce the cumulative wax precipitation amount of crude oil by 72.8%, decline the viscosity of crude oil by 85.6% at 20℃, reduce the average size of wax crystals by 89.7%, and inhibit the agglomeration of asphaltene by 74.8%. Therefore, the nanoparticles not only adjust the crystalline behaviors of waxes, but also inhibit the agglomeration of asphaltenes. Apparently, core-shell hybride nanoparticles provides more heterogeneous nucleation sites for the crystallization of wax molecules,thus inhibiting the formation of three-dimensional network structure. The core-shell polymer@SiO2hybride nanoparticles are one of promising additives for inhibiting crystallization of waxes and agglomeration of asphaltenes in crude oil.

关键词： Heavy oil Wax crystallization Asphaltene agglomeration Hybride nanoparticle Viscosity reduction

Removal of heavy metals from a contaminated soilusing tartaric acid

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Journal of Environmental Sciences 2006年第4期18卷 727-733页

作者： KE xin LI Pei-jun ZHOU Qi-xing ZHANG Yun sun Tie-heng Institute of Applied Ecology Chinese Academy of Sciences Shenyang 110016 China Graduate School of the Chinese Academy of Sciences Beijing 100039 China Shenyang Agriculture University Shenyang 110161 China

This study reports the feasibility of remediation of a heavy metal （HM） contaminated soil using tartaric acid, an environmentally-friendly extractant. Batch experiments were performed to test the factors influencing remediation of the HM contaminated soil. An empirical model was employed to describe the kinetics of riM dissolution/desorption and to predict equilibrium concentrations of HMs in soil leachate. The changes of HMs in different fractions before and after tartaric acid treatment were also investigated. Tartaric acid solution containing HMs was regenerated by chestnut shells. Results show that utilization of tartaric acid was effective for removal of riMs from the contaminated soil, attaining 50%-60% of Cd, 40%-50% of Pb, 40%-50% of Cu and 20%-30% of Zn in the pH range of 3.5-4.0 within 24 h. Mass transfer coefficients for cadmium （Cd） and lead （Pb） were much higher than those for copper （Cu） and zinc （Zn）. Sequential fractionations of treated and untreated soil samples showed that tartaric acid was effective in removing the exchangeable, carbonate fractions of Cd, Zn and Cu from the contaminated soil. The contents of Pb and Cu in Fe-Mn oxide fraciton were also significantly decreased by tartaric acid treatment. One hundred milliliters of tartaric acid solution containing HMs could be regenerated by 10 g chestnut shells in a batch reactor. Such a remediation procedure indicated that tartaric acid is a promising agent for remediation of HM contaminated soils. However, further research is needed before the method can be practically used for in situ remediation of contaminated sites.

关键词： tartaric acid soil remediation heavy metals soil contamination

Study on Mutations in ALS for Resistance to Tribenuron-Methyl in Galium aparine L.

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Agricultural Sciences in China 2011年第1期10卷 86-91页

作者： sun Jian WANG Jin-xin ZHANG Hong-jun LIU jun-liang BIAN Sheng-nan College of Plant Protection Shandong Agricultural University Tai＇an 271018 PR.China Institute for the Control of Agrochemicals Ministry of Agriculture Beijing 100125 P.R.China

In recent years, Galium aparine L. has not been controlled by tribenuron-methyl in major Chinese winter wheat fields. The objective of this study is to understand the molecular basis of the resistance mechanism to tribenuron-methyl in G. aparine and to find the specific mutation sites in amino acid sequence of acetolactate synthase （ALS） in the resistant biotype of G. aparine. Fragments that encode the ALS were amplified and cloned from susceptible （S） and resistant （R） biotypes of G. aparine to tribenuron-methyl and sequenced subsequently. The result showed that the nucleotide sequence of Rbiotype of G. aparine differed from that of the S biotype with three amino acid substitutions, of which, the amino acid substitution of Trp57-4 （TGG） to Gly （GGG） is located in the highly conserved region Domain B. The substitution of Trp574 might be responsible for the resistance to tribenuron-methyl in the R-biotype of G. aparine.

关键词： resistance Galium aparine L. acetolactate synthase gene mutation

Microstructure and properties of joint for stirring brazing of dissimilar Al/Mg alloy during heating processes

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Rare Metals 2015年第4期34卷 245-250页

作者： Hui-Bin Xu Hui-Bin sun Hui Yang Lu-xin Chi jun Chen School of Materials Science and Engineering Chongqing University of Technology

In this paper, 2024 Al alloy and AZ31B Mg alloy were brazed with aid of stirring without flux in air. The effects of the brazing temperature on microstructure and shear strength of the joint were investigated. The diffusion zone is found at joint interface near Al base metal, which consists of Al-Zn-Sn solid solution. At the same time, continuous intermetallic compounds （IMCs） phase and broken ones are found at joint interface near Mg base metal, which mainly consists of the Mg2Sn phase. With the increase of the brazing temperature, the shear strength at the joint interface near A1 base metal rises gradually. On the contrary, that of the joint interface near Mg base metal obviously decreases.

关键词： Stirring brazing 2024 Al alloy AZ31B Mg alloy Temperature

Variance Analysis and Adaptive Sampling for Indirect Light Path Reuse

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Journal of Computer Science & Technology 2016年第3期31卷 547-560页

作者： Hao Qin xin sun jun Yan Qi-Ming Hou Zhong Ren Kun Zhou State Key Laboratory of Computer Aided Design and Computer Graphics Zhejiang University Hangzhou 310058 China Microsoft Research Asia Beijing 100080 China

In this paper, we study the estimation variance of a set of global illumination algorithms based on indirect light path reuse. These algorithms usually contain two passes -- in the first pass, a small number of indirect light samples are generated and evaluated, and they are then reused by a large number of reconstruction samples in the second pass. Our analysis shows that the covariance of the reconstruction samples dominates the estimation variance under high reconstruction rates and increasing the reconstruction rate cannot effectively reduce the covariance. We also find that the covariance represents to what degree the indirect light samples are reused during reconstruction. This analysis motivates us to design a heuristic approximating the covariance as well as an adaptive sampling scheme based on this heuristic to reduce the rendering variance. We validate our analysis and adaptive sampling scheme in the indirect light field reconstruction algorithm and the axis-aligned filtering algorithm for indirect lighting. Experiments are in accordance with our analysis and show that rendering artifacts can be greatly reduced at a similar computational cost.

关键词： Monte Carlo method global illumination variance indirect light path reuse