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基于阳离子与聚合物絮凝反应的阳离子调堵剂的优选

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当代化工 2015年第12期44卷 2755-2758页

作者：闫文华闫炳旭杨兆明段效威东北石油大学提高采收率教育部重点实验室黑龙江大庆163318 大庆油田有限责任公司黑龙江大庆163318 辽河油田公司锦州采油厂辽宁盘锦124010

成功筛选阳离子选择性调堵剂对油田提高采收率、防止井窜、改善地层均质性均有非常重要的意义。针对辽河油田J16区块二元驱窜聚井低效循环、驱油效果不理想等复杂问题,利用阳离子调赌剂与聚合物能发生絮凝反映的原理,对调驱体系配方中... 详细信息

成功筛选阳离子选择性调堵剂对油田提高采收率、防止井窜、改善地层均质性均有非常重要的意义。针对辽河油田J16区块二元驱窜聚井低效循环、驱油效果不理想等复杂问题,利用阳离子调赌剂与聚合物能发生絮凝反映的原理,对调驱体系配方中与聚合物反应的阳离子种类及其用量进行了实验筛选。结果表明:所选用的7种阳离子调堵剂中,调堵剂1、2、4的聚沉效果较好;在聚合物浓度低于1 500 mg/L的条件下,阳离子调堵剂1、2、4作为优选出的阳离子堵剂较为理想;聚合物浓度分别为100、500、1 000、1 500 mg/L的条件下,阳离子堵剂的浓度为1 000、3000、5 000、10 000 mg/L较为理想。

关键词：阳离子堵剂堵剂种类堵剂用量调驱封窜

Combined MELD and blood lipid level in evaluating the prognosis of decompensated cirrhosis

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World Journal of Gastroenterology 2010年第11期16卷 1397-1401页

作者： Jiang, Ming Liu, Fei Xiong, Wu-Jun Zhong, Lan xu, Wen xu, Fei Liu, yan-bing Tongji Univ Shanghai E Hosp Affiliated Dept Gastroenterol Shanghai 200120 Peoples R China

AIM: To evaluate the prognostic value of the combined model for end-stage liver disease (MELD) and blood lipid level in patients with decompensated cirrhosis. METHODS: A total of 198 patients with decompensated cirrhosis were enrolled into the study. The values of triglyceride (TG), cholesterol (TC), high density lipoproteins (HDL) and low density lipoprotein (LDL) of each patient on the fi rst day of admission were retrieved from the medical records, and MELD was calculated. All the patients were followed up for 1 year. The relationship between the change of blood lipid level and the value of MELD score was studied by analysis of variance. The prognostic factors were screened by multivariate Cox proportional hazard model. Draw Kaplan-Meier survival curves were drawn. RESULTS: Forty-f ive patients died within 3 mo and 83 patients died within 1 year. The levels of TG, TC, HDL and LDL of the death group were all lower than those of the survivors. The serum TG, TC, HDL and LDL levels were lowered with the increase of the MELD score. Multivariate Cox proportional hazard model showed that MELD ≥18 and TC ≤2.8 mmol/L were independent risk factors for prognosis of decompensated cirrhosis. Survival analysis showed that MELD ≥18 combined with TC ≤ 2.8 mmol/L can clearly discriminate between the patients who would survive and die in 1 year. CONCLUSION: MELD ≥18 and TC ≤2.8 mmol/L are two important indexes to predict the prognosis of patients with decompensated cirrhosis. Their combination can effectively predict the long-term prognosis of patients with decompensated cirrhosis.

关键词： Cirrhosis Model of end-stage liver disease Blood lipid Prognosis Survival time

Dynamic Relationship Between Biologically Active Soil Organic Carbon and Aggregate Stability in Long-Term Organically Fertilized Soils

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Pedosphere 2012年第5期22卷 616-622页

作者： LI Cheng-Liang xu Jiang-bing HE Yuan-Qiu LIU yan-Li FAN Jian-Bo College of Resources and Environment Shandong Agricultural UniversityTai'an 271018(China) Institute of Soil Science Chinese Academy of SciencesNanjing 210008(China) National Engineering Laboratory for Efficient Utilization of Soil and Fertilizer Resources Tai'an 271018(China)

Biologically active soil organic carbon （BASOC） is an important fraction of soil organic carbon （SOC）, but our understanding of the correlation between BASOC and soil aggregate stability is limited. At an ecological experimental station （28° 04＇-28° 37＇ N, 116° 41＇-117° 09＇ E） in Yujiang County, Jiangxi Province, China, we analyzed the dynamic relationship between soil aggregate stability and BASOC content over time in the red soil （Udic Ferrosols） fertilized with a nitrogen-phosphorus-potassium chemical fertilizer （NPK） without manure or with NPK plus livestock manure or green manure. The dynamics of BASOC was evaluated using CO2 efflux, and soil aggregates were separated according to size using a wet-sieving technique. The soils fertilized with NPK plus livestock manure had a significantly higher content of BASOC and an improved aggregate stability compared to the soils fertilized with NPK plus green manure or NPK alone. The BASOC contents in all fertilized soils decreased over time. The contents of large aggregates （800-2 000 μm） dramatically decreased over the first 7 d of incubation, but the contents of small aggregates （〈 800 μm） either remained the same or increased, depending on the incubation time and specific aggregate sizes. The aggregate stability did not differ significantly at the beginning and end of incubation, but the lowest stability in all fertilized soils occurred in the middle of the incubation, which implied that the soils had a strong resilience for aggregate stability. The change in BASOC content was only correlated with aggregate stability during the first 27 d of incubation.

关键词： aggregate size CO2 release manure mean weight diameter organic fertilization

Global existence and blow up of solutions for two classes of reaction diffusion systems with two nonlinear source terms in bounded domain

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Applied Mathematics(A Journal of Chinese Universities) 2016年第4期31卷 389-408页

作者： xu Run-zhang WANG Xing-chang CHEN Shao-hua LIU Yu yanG yan-bing College of Science Harbin Engineering University College of Automation Harbin Engineering University Department of Mathematics Cape Breton University

In this paper we deal with the initial boundary value problem for two classes of reaction diffusion systems with two source terms in bounded domain. Under some assumptions on the exponents and the initial data, applying the comparison principle, the maximum prin- ciple and the supersolution-subsolution method, we prove the global existence and blow up of solutions. We also establish some upper blow up rates.

关键词： reaction diffusion equations global existence blow up blow up rate.

High-Performance RuCl3 Catalyst Systems for Hydro-Esterification of Methyl Formate and Ethylene

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Chinese Journal of Chemistry 2019年第8期37卷 769-774页

作者： yan-Ru Li Zhong-Ning xu bing Bai Zhi-Qiao Wang Guo-Cong Guo State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhouFujian 350002China University of Chinese Academy of Sciences Beijing 100049China School of Physical Science and Technology ShanghaiTech UniversityShanghai 201210China Shanghai Institute of Ceramics Chinese Academy of SciencesShanghai 200050China

Summary of main observation and conclusion RuCl3 catalyst system has many advantages for the hydro-esterification of methyl formate and ethylene to methyl ***,the unsatisfied performance restricts the development of this *** this work,high-performance RuCl3 catalyst systems (RuCl3-[PPN]Cl-Et4NI and RuCl3-Nal) are firstly reported for this *** RuCl3-[PPN]Cl-Et4NI catalyst system,the conversion of methyl formate and the selectivity to methyl propionate are 93.9% and 90.9% at mild reaction conditions (165 ℃,2.5 MPa),***,a simple inorganic RuCl3-Nal catalyst system achieves 88.8% conversion of methyl formate and 97.6% selectivity to methyl propionate (86.7% yield) at same ***,as a promoter,may inhibit the decomposition of methyl formate and be conducive to the formation of methyl *** effects of solvents and promoters are investigated in *** addition,the reaction mechanism has been also *** is hoped to lay a certain foundation for further industrial application.

关键词： RuCl3 Catalyst Systems Hydro-Esterification Methyl Formate Ethylene

Damping capacity of Fe_(83)Ga_(17) magnetostrictive alloy under magnetic field

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Rare Metals 2024年第1期43卷 402-409页

作者： Shao-Wen yan Xing Mu bing-Jie Liu Li-Hong xu Shi-Hai Guo yan Qi Hong-Ping Zhang Department of Functional Material Research Central Iron and Steel Research InstituteBeijing 100081China

The damping performance of Fe_(83)Ga_(17) alloys has been investigated in the static magnetic field (H). The results demonstrate that the damping peak value can be adjusted between 0.020 and 0.085 under the magnetic f... 详细信息

关键词： alloy magnetic alloys

Hydrogenation Behavior of Hydrogen Peroxide in a Microreactor

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China Petroleum Processing & Petrochemical Technology 2022年第4期24卷 29-35页

作者： Zhu Hongwei Sun bing Jin yan Feng Junjie Zhao Chenyang yan Junjie Jiang Jie xu Wei SINOPEC Research Institute of Safety Engineering Co. Ltd.Qingdao 266071 State Key Laboratory of Heavy Oil Processing China University of Petroleum Qingdao 266580

The hydrogenation of hydrogen peroxide is an unwanted side reaction in the direct synthesis of hydrogen peroxide and remains a problem to *** mechanism of this reaction has been studied with batch reactors but the slow heat and mass transfer in batch reactors hindered the understanding of its intrinsic *** this study,a microreactor is employed to investigate the parameters that influence the hydrogenation reaction,including flow rate,channel length,hydrogen pressure,solvent composition,and initial hydrogen peroxide *** activity of different catalysts was compared and the hydrogenation law was confirmed,providing guiding information to better control the hydrogenation process.

关键词： hydrogenation hydrogen peroxide microreactor hydrogenation decomposition law catalyst passivation

Status quo and factors of depression and anxiety in patients with non-muscle invasive bladder cancer after plasma electrocision

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World Journal of Psychiatry 2024年第6期14卷 822-828页

作者： bing Lu Meng Ding Hong-Bo xu Chun-Yin yan Department of Urology Suzhou Dushu Lake HospitalSuzhou 215000Jiangsu ProvinceChina Department of Urology The First Affiliated Hospital of Soochow UniversitySuzhou 215000Jiangsu ProvinceChina

BACKGROUND Bladder cancer is a type of cancer with a high incidence in *** electrosurgery(PES)is often used in the treatment of bladder *** complications often cause depression and anxiety in patients after *** To investigate the current state of depression and anxiety after PES in patients with non-muscle-invasive bladder cancer and analyze the factors affecting *** A retrospective study was conducted to compare the baseline data of patients by collecting their medical history and grouping them according to their mental status into negative and normal *** regression analysis was used to explore the risk factors affecting the occurrence of anxiety and depression after surgery in patients with bladder *** Comparative analyses of baseline differences showed that the patients in the negative and normal groups differed in terms of their first surgery,economic status,educational level,and marital status.A logistic regression analysis showed that it affected the occurrence of anxiety in patients with bladder cancer,and the results showed that whether the risk factors were whether or not it was the first surgery,monthly income between 3000 and 3000-6000,secondary or junior high school education level,single,divorced,and widowed *** The risk factors affecting the onset of anxiety and depression in bladder cancer patients after PES are the number of surgeries,economic status,level of education,and marital *** study provides a reference for the clinical treatment and prognosis of bladder cancer patients in the future.

关键词： Bladder cancer Anxiety Depression Analysis of influencing factors Plasma electrocision

A Novel Blue Thin Film Electroluminescent Phosphor Gd_(3)Ga_(5)O_(12):Ag

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Chinese Physics Letters 1999年第5期16卷 387-388页

作者： xu Xiu-lai xu Zheng HOU yan-bing WANG Xiao-wei CHEN Xiao-hong xu xu-rong Institute of Optoelectronics Technology Northern Jiaotong UniversityBeijing 100044 Laboratory of Excited State Processes Changchun Institute of PhysicsChinese Academy of SciencesChangchun 130021 Institute of Material Physics Tianjin Institute of TechnologyTianjin 300191 Department of Electronical Engineering Jilin UniversityChangchun 130023

A new blue thin film electroluminescence(TFEL)phosphor Gd_(3)Ga_(5)O_(12):Ag is prepared by electron beam *** and Electroluminescence of Gd_(3)Ga_(5)O_(12):Ag film were *** luminance of TFEL device excited by an alter... 详细信息

关键词： film excited