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Isothermal Stage Kinetics of Direct Coal Liquefaction for Shenhua Shendong Bituminous Coal

ENERGY & FUELS 2015年第11期29卷 7526-7531页

作者： Jiang, Hongbo Wang, Xiuhui Shan, Xiangen Li, Kejian Zhang, xuwen cao, Xueping Weng, Huixin E China Univ Sci & Technol Res Inst Petr Proc Shanghai 200237 Peoples R China Natl Engn Lab Direct Coal Liquefact Shanghai 201108 Peoples R China

To study the direct coal liquefaction in the isothermal stage of Shenhua Shendong bituminous coal, the direct coal liquefaction with an iron-based catalyst was carried out in a 0.01 ton/day continuous tubular facility in the temperature range of 445-465 degrees C, with hydrogenated anthracene and wash oil as the solvent. An eight-lump kinetic model of the isothermal stage was proposed, and the kinetic parameters were estimated. The result showed that, in the isothermal stage, the oil was mainly obtained from pre-asphaltene and asphaltene (PAA) rather than from coal directly. The model was valid for the isothermal stage of direct coal liquefaction.

关键词： TEMPERATURE RANGE Mentoring Coal liquefaction absorbent oil kinetic model stream stage Kinetic parameters bituminous coal

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Effect of hydrogenation of liquefied heavy oil on direct coal liquefaction

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FUEL 2017年 194卷 291-296页

作者： Shan Xiangen Shu Geping Li Kejian Zhang xuwen Wang Hongxue cao Xueping Jiang Hongbo Weng Huixin East China Univ Sci & Technol Res Inst Petr Proc Shanghai 200237 Peoples R China Natl Engn Lab Direct Coal Liquefact Shanghai 201108 Peoples R China

The effect of hydrotreatment of liquefied heavy oil on direct coal liquefaction (DCL) was studied by hydrogenating the liquefied heavy oil (initial boiling point greater than 320 degrees C) in a 30 ml continuous hydrogenation apparatus at operating conditions of pressure (P) 13-19 MPa, temperature (T) 360-400 degrees C, liquid space velocity (LHSV) 0.6-1.4 h(-1). After hydrogenation, the properties and hydrocarbon composition of liquefied heavy oil were regulated, leading to the enhancement of hydrogen donating ability and 5.6% increase in oil yield of DCL as compared with non-hydrogenated raw oil. Based on the results, a new method of preparing recycle solvent for direct coal liquefaction by mixing hydrogenated heavy oil and un-hydrogenated middle oil in a suitable proportion was proposed, which has been verified to be effective and efficient to increase oil yield. (C) 2017 Elsevier Ltd. All rights reserved.

关键词： Direct coal liquefaction Hydrogenation Liquefied product Hydrogenated oil Hydrogen-donating ability

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Maternal perception of child weight and concern about child overweight mediates the relationship between child weight and feeding practices

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PUBLIC HEALTH NUTRITION 2022年第7期25卷 1780-1789页

作者： Wang, Jian Zhu, Daqiao Cheng, xuwen Liuzhou, Yicong Zhu, Bingqian Montgomery, Scott cao, Yang Shanghai Jiao Tong Univ Sch Nursing Shanghai 200025 Peoples R China Kings Coll London Florence Nightingale Fac Nursing Midwifery & Pall London England Jinyang Community Hlth Serv Ctr Dept Childrens Dis Prevent Shanghai Peoples R China Shanghai Childrens Med Ctr Dept Nursing Shanghai Peoples R China Orebro Univ Sch Med Sci Clin Epidemiol & Biostat Orebro Sweden Karolinska Inst Dept Med Clin Epidemiol Div Stockholm Sweden UCL Dept Epidemiol & Publ Hlth London England

Objective: To examine the mediating effects of maternal perception of child weight (weight perception) and concern about overweight (weight concern) on the paths between child weight and maternal feeding practices. Setting: Pudong District, Shanghai, China. Participants: A convenience sample of 1164 mothers who were primary caregivers of preschool children. Results: Sixty per cent of the mothers perceived their overweight/obese children as normal weight or even underweight. The disagreement between actual child weight and maternal weight perception was statistically significant (Kappa = 0 center dot 212, P < 0 center dot 001). Structural equation modelling indicated that weight perception fully mediated the relationship between child BMI Z-scores and pressure to eat. Weight concern fully mediated the relationships between child BMI Z-scores and the other three feeding practices. The serial mediating effects of weight perception and concern were statistically significant for the paths between child BMI Z-score and monitoring (beta = 0 center dot 035, P < 0 center dot 001), restriction (beta = 0 center dot 022, P < 0 center dot 001), and food as a reward (beta = -0 center dot 017, P < 0 center dot 05). Conclusion: Child weight may influence maternal feeding practices through weight perception and concern. Thus, interventions are needed to increase the accuracy of weight perception, which may influence several maternal feeding practices and thereby contribute to child health.

关键词： Preschool children Maternal concern Weight perception Feeding practices

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Dynamic design method of digital twin process model driven by knowledge-evolution machining features

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INTERNATIONAL JOURNAL OF PRODUCTION RESEARCH 2022年第7期60卷 2312-2330页

作者： Liu, Jinfeng Zhao, Peng Jing, xuwen cao, Xuwu Sheng, Sushan Zhou, Honggen Liu, Xiaojun Feng, Feng Jiangsu Univ Sci & Technol Sch Mech Engn Zhenjiang 212003 Jiangsu Peoples R China Southeast Univ Sch Mech Engn Nanjing Peoples R China Shaanxi Diesel Engine Heavy Ind Co Ltd Xingping Peoples R China

Machining plan is the core of guiding manufacturing production and is regarded as one of the keys to ensure the quality of product processing. Existing process design methods are inefficient to quickly handle the machining plan changed induced by the unpredictable events in real-time production. It inevitably causes time and economic losses for the enterprise. In order to express the evolutionary characteristics of product processing, the construction method of digital twin process model (DTPM) is proposed based on the knowledge-evolution machining features. Three key technologies include correlation structure of process knowledge, expression method of the evolution geometric features and the association mechanism between two are solved. On this basis, the construction framework of DTPM is illustrated. Then, the organisation and management mechanism of multi-source heterogeneous data is discussed in detail. At last, a case study of the complex machined part is researched, the results show that the processing time reduced by about 7% and the processing stability improved by 40%. Meanwhile, the implementation scheme, application process and effect of this case are described in detail to provide reference for enterprises.

关键词： Digital twin process knowledge machining features dynamic evolution

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Binding affinity and dissociation pathway predictions for a series of USP7 inhibitors with pyrimidinone scaffold by multiple computational methods

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PHYSICAL CHEMISTRY CHEMICAL PHYSICS 2020年第10期22卷 5487-5499页

作者： Wang, Zhe Wang, xuwen Kang, Yu Zhong, Haiyang Shen, Chao Yao, Xiaojun cao, Dongsheng Hou, Tingjun Zhejiang Univ Coll Pharmaceut Sci Hangzhou 310058 Zhejiang Peoples R China Macau Univ Sci & Technol Macau Inst Appl Res Med & Hlth State Key Lab Qual Res Chinese Med Ave Wai Long Taipa Macao Peoples R China Cent South Univ Xiangya Sch Pharmaceut Sci Changsha 410013 Hunan Peoples R China

Ubiquitin specific protease 7 (USP7) has attracted increasing attention because of its multifaceted roles in different tumor types. The crystal structures of USP7-inhibitor complexes resolved recently provide reliable models for computational structure-based drug design (SBDD) towards USP7. How to accurately estimate USP7-ligand binding affinity is quite critical to guarantee the reliability of SBDD. In this study, we assessed the reliability of multiple computational methods to the binding affinity prediction for a series of USP7 inhibitors with the pyrimidinone scaffold, including molecular docking scoring, MM/PB(GB)SA, and umbrella sampling (US). It was found that the accuracy of the evaluated computational methods for binding affinity prediction follows the order: US-based method > MM/PB(GB)SA > Glide XP scoring. The calculation results demonstrate that incorporating protein flexibility through induced-fit docking or ensemble docking cannot improve the performance of the Glide scoring based on rigid-receptor docking. For the MM/PB(GB)SA methods, the choice of the protein structure and the calculation procedure has a marked impact on the predictions. More importantly, we discovered for the first time that there are significant differences in the dissociation pathways of strong-binding inhibitors and weak-binding inhibitors of USP7, which may be used as a new criterion to judge whether an inhibitor is a strong binder or not. It is expected that our work can provide valuable guidance on the design and discovery of potent USP7 inhibitors.

关键词： Computational methods

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A Study on Genotype-by-Environment Interaction Analysis for Agronomic Traits of Maize Genotypes Across Huang-Huai-Hai Region in China

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Phyton-International Journal of Experimental Botany 2022年第1期91卷 57-81页

作者： Haiwang Yue Jianwei Wei Junliang Xie Shuping Chen Haicheng Peng Hongmei cao Junzhou Bu xuwen Jiang Dryland Farming Institute Hebei Academy of Agriculture and Forestry SciencesHebei Provincial Key Laboratory of Crops Drought Resistance ResearchHengshui053000China Soil and Fertilizer Workstation of Hengshui Agriculture and Rural Bureau Hengshui053000China Maize Research Institute/College of Agronomy Qingdao Agricultural UniversityQingdao266109China

Facing the trend of increasing population,how to increase maize grain yield is a very important issue to ensure food *** this study,28 nationally approved maize hybrids were evaluated across 24 different climatic conditions for two consecutive years(2018-2019).The purpose of this study was to select high-yield with stable genotypes and identify important agronomic traits for maize breeding program *** results of this study showed that the genotypeenvironment interaction effects of the 12 evaluated agronomic traits was highly significant(P<0.001).We introduced a novel multi-trait genotype-ideotype distance index(MGIDI)to select genotypes based on multiple agronomic *** selection process exhibited by this method is unique and easy to understand,so the MGIDI index will have more and more important applications in future multi-environment trials(METs)*** genotypes selected by the MGIDI index were G22,G10,G12 and G1 as the high yielding and stable *** parents of these selected genotypes have the ability to play a greater role as the basic germplasm in the breeding process.A new form of genotype(G)main effects and genotype(G)-by-environment(E)interaction(GGE)technician,genotypeyieldtrait(GYT)biplot,based on multiple traits for genotypes selection was also applied in this *** GYT biplot ranked genotypes by combining grain yield with other evaluated agronomic traits,and displayed the distribution of their traits,namely strengths and weaknesses.

关键词： GEI MGIDI GYT biplot AMMI model GGE

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Research on the intelligent generation method of MBD model 3D marking using predefined features

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CONCURRENT ENGINEERING-RESEARCH AND APPLICATIONS 2020年第3期28卷 222-238页

作者： Jing, xuwen Tang, Mingming Liu, Jinfeng Zhou, Honggen Zhao, Peng Wang, Zhen cao, Xuwu Sheng, Sushan Wei, Gang Jiangsu Univ Sci & Technol Sch Mech Engn Zhenjiang 212003 Jiangsu Peoples R China Jiangsu Univ Sci & Technol Jiangsu Prov Key Lab Adv Mfg Marine Mech Equipmen Zhenjiang Jiangsu Peoples R China Shanxi Diesel Engine Heavy Ind Co Ltd Xingping Shanxi Peoples R China

Model-based definition (MBD) carries out a technological innovation for global manufacturing, application of MBD technology plays an important supporting in process design, product manufacturing and other development activities, rapid creation of MBD models have become a key to reduce time and cost for enterprises. However, interactive dimensioning method has severely hampered the efficiency of MBD model creation. This paper mainly studies the dimensions intelligent marking method based on the predefined features to solve the rapid modeling problem of MBD model. Firstly, the expression model of dimensions metadata is established based on the feature identifier. Secondly, by establishing an association mechanism between the dimensions and the predefined feature, the "model-feature-dimensioning" association model is formed. Thirdly, through analysis of the dimensioning type, the intelligent dimensioning algorithm process is determined. Moreover, the completeness check of the dimensions is guaranteed during the marking process. Finally, taking the connecting rod and crankshaft of marine diesel as the research object, the effectiveness of this method is verified.

关键词： MBD dimension predefined features metadata intelligent marking

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NUMERICAL SIMULATION AND PARAMETRIC ANALYSIS OF THE WALL STRAIN DISTRIBUTION OF VERTICALLY PLACED METAL HYDRIDE BASED HYDROGEN STORAGE CONTAINER 23

NUMERICAL SIMULATION AND PARAMETRIC ANALYSIS OF THE WALL STR...

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23rd World Hydrogen Energy Conference: Bridging Continents by H2, WHEC 2022

作者： cao, Shuaijie Yin, xuwen Yang, Fusheng Jiang, Lijun Wu, Yuanfang Wu, Zhen Zhang, Zaoxiao Xi'an Jiaotong University School of Chemical Engineering and Technology Shaanxi Xi'an China Xinjiang University School of Mechanical Engineering Xinjiang Uygur Autonomous Regions Urumqi China Co. LTD Beijing China

ISBN: (纸本)9786250008430

Pulverization, settling and agglomeration, and the consequent densification may occur for metal hydride particles during the charge-discharge cycles, which will affect the wall strain of their container for hydrogen storage. In order to study the effects of different factors on the wall strain of metal hydride hydrogen storage vessel, a reaction-thermal-mechanical coupling model for LaNi5 alloy was modified with regard to some relevant parameters, by which sensitivity analysis was conducted. Finally, the strain distribution along the height of reactor filling Mg2Ni was predicted by the model and compared with experimental results reported in literature. © 2022 Proceedings of WHEC 2022 - 23rd World Hydrogen Energy Conference: Bridging Continents by H2. All rights reserved.

关键词： Hydrogen storage

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Ladderane records over the last century in the East China sea: Proxies for anammox and eutrophication changes

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WATER RESEARCH 2019年第Jun.1期156卷 297-304页

作者： Zhao, Zongshan cao, Yali Fan, Ying Yang, Haili Feng, xuwen Li, Li Zhang, Hailong Xing, Lei Zhao, Meixun Ocean Univ China Inst Adv Ocean Study Minist Educ Key Lab Marine Chem Theory & Technol Qingdao 266100 Shandong Peoples R China Qingdao Natl Lab Marine Sci & Technol Lab Marine Ecol & Environm Sci Qingdao 266237 Shandong Peoples R China Chinese Acad Sci Qingdao Inst Bioenergy & Bioproc Technol CAS Key Lab Biobased Mat Qingdao 266101 Shandong Peoples R China Jiangxi Inst Anal & Test Nanchang 330029 Jiangxi Peoples R China State Ocean Adm Inst Oceanog 2 Hangzhou 310012 Zhejiang Peoples R China

Anaerobic ammonium oxidation (anammox), an important process for converting fixed nitrogen to N-2, plays an important role in the present-day marine nitrogen cycle. However, little is known about anammox activities in the past, especially in regions that were strongly affected by human activities, evidenced by eutrophication and hypoxia, which promote anammox bacteria growth. In this study, ladderanes have been measured in a sediment core and suspended particulate matter (SPM) in the East China Sea (ECS), to reconstruct the anammox record and to evaluate its responses to eutrophication and hypoxia. The detection and distribution of different ladderane lipids in SPM provide additional evidence that ladderanes were mostly produced in the water column and could reflect anammox activities. Summed ladderane content from the core varied between 11 and 300 ng/g dry weight (dw) sediment, with C20-[5]-ladderane fatty acid methyl esters (FAME) as the predominant compound (5-150 ng/g dw), followed by C20-[3]-ladderane FAME (1-110 ng/g dw), C18-[3]-ladderane FAME (1-32 ng/g dw) and 08 -[5]-ladderane FAME (3-11 ng/g dw). The detection of ladderanes over the last century indicate the existence of anammox in the past. The rapidly increasing trend of ladderanes since the 1960s correlates with an increase in phytoplankton biomarkers (2 Sigma(B + D + A), brassicasterol (B), dinosterol (D) and C-37 alkenones (A)), indicating that eutrophication exacerbated anammox growth. The co-variation between our ladderane record and published records of low-oxygen tolerant foraminiferal microfossils and hypoxia events over the past 60 years suggested that sediment ladderanes are a useful indicator for past changes of oxygen depletion or hypoxia in the ECS. (C) 2019 Elsevier Ltd. All rights reserved.

关键词： Anammox Ladderanes Nitrogen cycle Phytoplankton Hypoxia

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Characterization of the growth-related transcriptome in the Liver and Brain of mandarin fish (Siniperca chuatsi) through RNA-Seq analysis

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JOURNAL OF APPLIED ANIMAL RESEARCH 2024年第1期52卷

作者： Ding, Weidong cao, Liping cao, Zheming Bing, xuwen Chinese Acad Fishery Sci Freshwater Fisheries Res Ctr Key Lab Freshwater Fisheries & Germplasm Resources Minist Agr Wuxi 214081 Peoples R China

The brain and liver of mandarin fish (Siniperca chuatsi) produce essential hormones for their growth and development. However, the mechanisms underlying the interplay of these hormones remain unclear. This study aimed to assess the slow - and fast-growing traits, including body weight and length of mandarin fish reared in a single pond. To compare the differentially expressed genes (DEGs) in slow - and fast-growing fishes, we performed RNA sequencing analysis. After assembling the clean reads, 192,280 transcripts and 100,416 unigenes were obtained. 344 and 845 DEGs in the brain and liver in the fast-and slow-growing group were annotated respectively. These DEGs were associated with signaling pathways involved in growth and development, such as AGE-RAGE, Transforming growth factor-beta/Smad, Mitogen-activated protein kinase, Wingless/Integrated, and Insulin-like growth factor (IGF) 1. Furthermore, our fasting experiment revealed a concurrent decrease in body weight and the expression levels of genes related to the growth hormone (GH)/IGF system, alongside an increase in the insulin-like growth factor binding protein gene IGFBP3 expression. These findings suggest the GH/IGF system regulates body weight during fasting periods. The vast amount of transcriptome data generated in this study substantially expands the existing gene and genome resources for the growth traits of mandarin fish.

关键词： Mandarin fish transcriptome growth DEG fasting

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