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Chinese Journal of Chemical Engineering 2016年第9期24卷 1298-1305页

作者： Lin Yang Jianxin Cao Caiyu Li School of Chemistry and Chemical Engineering Guizhou UniversityGuiyang 550025China College of Resource and Environmental Engineering Guizhou UniversityGuiyang 550025China Guizhou Key Laboratory.for Green Chemical and Clean Energy Technology Guiyang 550025China

The distribution of water channels in the crystal morphology of type-α hemi-hydrated gypsum(α-HH) was theoretically detected to investigate the effect of water channels on the hydration reactivity of hemi-hydrate phosphogypsum(HPG). Results showed that water channels were mainly distributed in the cylinders of α-HH crystal,whereas no water channel existed in the conical surfaces parallel to the z-axis. Increasing the number of water channels was critical to enhance the hydration activity of HPG compared with the hydration reactivity of industrial HPG and type-α high-strength gypsum. Controlling the technological parameters of crystallization by concentration of liquid-phase SO_4^(2-) made it possible to obtain HPG which had the stumpy crystals of α-HH and high hydration reactivity.

关键词：水和反应控制形态学水隧道半含水的 phosphogypsum

Evolution and significance of the psychosomatic model in gastroenterology

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General Psychiatry 2022年第5期35卷 297-302页

作者： Qiaoli Zhang Lixin Ding Jianxin Cao Institute of Psychosomatic Gastroenterology Soochow UniversityChangzhouChina Department of Gastroenterology The Third Affiliated HospitalSoochow UniversityChangzhouChina

The biomedical model,which limits itself to finding the attributions of organic disease,is challenged by gastrointestinal(GI)symptoms.Simultaneously,physicians'attribution of GI symptoms to underlying psychological issues is not readily accepted by patients and can negatively affect the clinical rapport between doctor and patient.In reality,psychosocial aspects are involved in many functional disorders and organic diseases,not just in mental disorders.Time is overdue for gastroenterologists to recognise the inadequacy and limitations of conventional gastroenterology and consider the role of psychological,social and biological variables throughout the entire clinical course of the illness,as is shown in George Engel’s model.This review discusses the following:(1)the current challenges of using the conventional clinical model for both functional and organic GI illness,(2)the inadequacy and limitations of explaining GI symptoms simply as psychological disorders,(3)the exploration of the symptom-centred,stepped reattribution clinical model,(4)the clarification of psychosomatic medical concepts for use in gastroenterology,and(5)the significance of a systematic and interdisciplinary framework for a comprehensive psychosomatic model in gastroenterology.

关键词： gastro psychological readily

Separation and recovery of associated rare earths from the Zhijin phosphorite using hydrochloric acid

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Journal of Rare Earths 2019年第4期37卷 443-450页

作者： Dengpan Nie An Xue Mingyang Zhu Yu Zhang Jianxin Cao College of Resource and Environmental Engineering Guizhou University School of Chemical Engineering Guizhou Minzu University Guizhou Institute of Metallurgical and Chemical Engineering School of Chemistry and Chemical Engineering Guizhou University

The separation and extraction of associated rare earths from the Zhijin phosphorite mine is of great interest. Based on previous studies, the hydrolysis of phosphate ore using hydrochloric acid was systematically studied through extensive testing. Experiments were conducted to separate and recover the rare earths from the hydrolysis solution. Kinetic studies on the acidolysis of phosphorite using hydrochloric acid show that the use of hydrochloric acid in the acidolysis of phosphorite is mainly controlled by a chemical reaction and is also a diffusion-controlled reaction. When 210 L of HCL per 100 kg of phosphorite was used at 30 ℃ for 360 min, 96.1% of the P_2 O_5 and 95.0% of the rare earths are leached from the phosphorite. After defluorination and purification, the pH of the phosphate-acid solution is adjusted to 2.1 using sodium hydroxide, and a rare earth concentrate with rare earth content of 1.76 wt%is obtained; i.e., 90.1% of the rare earths are recovered. The rare earth content is increased to more than5 wt% through multiple enrichment processes, with a total yield of 59.5%.

关键词： Zhijin phosphorite mine Rare earths Leaching Separation Recovery

Migration behavior, separation and recycling of rare earth during thermal decomposition of Zhijin phosphorus ore

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Journal of Rare Earths 2018年第11期36卷 1205-1211页

作者： Dengpan Nie Yu Zhang An Xue Mingyang Zhu Jianxin Cao College of Resource and Environmental Engineering Guizhou University Guiyang 550025 China Guizhou Institute of Metallurgical aud Chemical Engineering Guiyang 550002 China School of Chemistry and Chemical Engineering Guizhou University Guiyang 550025 China

Zhijin phosphorus ore is a moderate and low-grade phosphorus rare-earth ore contained in mines. The separation and extraction of associated rare earth are important research topics. In this study, the migration behavior of rare earth during the thermal decomposition of Zhijin phosphorus ore and the separation and extraction of rare earth in phosphorus slag are discussed systematically. During the thermal decomposition process of phosphorus ore, almost all of the associated rare earth enters into the phosphorus slag phase but does not enter into the ferrophosphorus or gas phases. Amorphous calcium metasilicate and calcium fluosilicate are major components of phosphorus slag, and rare earth mainly exists as a calsil solid solution. Hydrochloric acid was used for acidolysis of the phosphorous slag. Under the following conditions, 96% of the rare earth in the phosphorous slag can be dissolved in the acidolysis solution： acid excess coefficient of 1.5, reaction time of 50 min and reaction temperature of 50℃. The rare earth in the acidolysis solution was separated and recycled using oxalic acid as a precipitator and NaOH as a pH modifier. At pH of 1.7, rare-earth-enriched matter with rare-earth content of 2.1 wt% was obtained, and the recovery of the rare earth was 88%.

关键词： Zhijin phosphorus ore Rare earth Thermal decomposition Migration behavior Separation

Automatic target recognition combining angular diversity and time diversity for multistatic passive radar

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Science China(Information Sciences) 2022年第7期65卷 271-272页

作者： Xiaomao cao jianxin YI Ziping GONG Xianrong WAN School of Electronic Information Wuhan University

Dear editor, The radar cross section-based (RCS-based) method is an important research direction in the field of automatic target recognition (ATR) of passive radars [1–5]. Due to the unknown transmitting parameters in the passive radar, it is impossible to extract the true target RCS from the echo power. As a result of this, researchers use a biased RCS which has an unknown parameter to realize the RCS-based ATR in passive radar [1, 2].

关键词： automatic target recognition angular diversity multistatic passive radar radar cross section time diversity

Deep decalcification of factory-provided freezing acidolysis solution to achieve α-high-strength gypsum

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CHINESE JOURNAL OF CHEMICAL ENGINEERING 2024年第5期69卷 143-151页

作者： Ye, Wencai Li, Yulu Dong, Yonggang Yang, Lin Yi, Yun cao, jianxin Guizhou Univ Sch Chem & Chem Engn Guiyang 550025 Peoples R China Guizhou Univ Key Lab Guizhou Prov Green Chem Ind & Clean Energy Guiyang 550025 Peoples R China Guizhou Univ Engn Res Ctr Efficient Utilizat Ind Waste Guiyang 550025 Peoples R China

The freezing acidolysis solution of the nitric acid-phosphate fertilizer process has a high calcium content, which makes it difficult to produce fine phosphate and high water-soluble phosphate fertilizer products. Here, based on the potential crystallization principle of calcium sulfate in NH4NO3-H3PO4-H2O, the deep decalcification (i.e. calcium removal) technology to achieve a-high-strength gypsum originated from freezing acidolysis-solutions has been firstly proposed and investigated. Typically, calcium can be removed from the factory-provided freezing acidolysis-solution by neutralizing it with ammonia, followed by the addition of ammonium sulfate solution. As a result, the formation of calcium sulfate in the reaction system undergoes the nucleation and growth of CaSO4 center dot 2H(2)O (DH), as well as its dissolution and crystallization into short columnar alpha-CaSO4 center dot 0.5H(2)O (alpha-HH). Remarkably, with the molar ratio of SO42-/Ca2+ at 1.8, the degree of neutralization (NH3/HNO3 molar ratio) at 1.7, the reaction temperature of 94 degrees C, and the reaction time of 300 min, the decalcification rate can reach 86.89%, of which the high-strength alpha-CaSO4 center dot 0.5H(2)O (alpha-HH) will be obtained. Noteworthy, the deep decalcification product meets the standards for the production of fine phosphates and highly water-soluble phosphate fertilizers. Consequently, the 2 h flexural strength of alpha-HH is 5.3 MPa and the dry compressive strength is 36.8 MPa, which is up to the standard of commercial alpha-HH. (c) 2024 The Chemical Industry and Engineering Society of China, and Chemical Industry Press Co., Ltd. All rights reserved.

关键词： Nitrophosphate Ammonia neutralization Deep decalcification High-strength alpha-hemihydrate gypsum Controlled crystallization at atmospheric pressure CALCIUM-SULFATE HEMIHYDRATE GAS DESULFURIZATION GYPSUM PHOSPHATE CONCENTRATE FGD GYPSUM MORPHOLOGY MODIFIER SIZE

Experimental Study on Characteristics Variation of Permanent Magnets for High-speed Machine Applications

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Chinese Journal of Electrical Engineering 2022年第1期8卷 16-23页

作者： Yunchong Wang Hongxia cao Ilhami Colak Youhao Zhang jianxin Shen College of Electrical Engineering Zhejiang UniversityHangzhou 310027China Zhejiang Provincial Key Laboratory of Electrical Machine Systems Hangzhou 310027China Department of Electrical and Electronics Engineering Nisantasi UniversityIstanbul 34000Turkey

High-speed permanent magnet(PM)electric machines are widely used.However,their extreme operating conditions,e.g.,high temperature and high mechanical stress,lead to variations of the PM characteristics and affect the machine performance.In the present study,an experimental device is designed to test the PM characteristics by simulating the stress and temperature conditions of high-speed machines.The experimental results indicate that the PM remanence not only varies at high temperatures,which is well known,but also changes under high mechanical stress.It is shown that the PM remanence increases with the mechanical stress but decreases with the temperature rise.Accordingly,a new demagnetization-curve model of the magnets under multiple stresses is refined to better express the PM characteristics.The performance of a high-speed PM machine is then analyzed as an example to indicate the necessity of the model refinement.The effects of the temperature and mechanical stress on the conductivity of the PMs are also examined.The experimental results indicate that the conductivity of the PM increases with the temperature and pressure.

关键词： High-speed machine permanent magnet mechanical stress remanence variation demagnetization-curve model

Data fusion of target characteristic in multistatic passive radar

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Journal of Systems Engineering and Electronics 2021年第4期32卷 811-821页

作者： cao Xiaomao YI jianxin GONG Ziping RAO Yunhua WAN Xianrong School of Electronic Information Wuhan UniversityWuhan 430072China Shenzhen Research Institute Wuhan UniversityShenzhen 518057China

Radar cross section(RCS)is an important attribute of radar targets and has been widely used in automatic target recognition(ATR).In a passive radar,only the RCS multiplied by a coefficient is available due to the unknown transmitting parameters.For different transmitter-receiver(bistatic)pairs,the coefficients are different.Thus,the recovered RCS in different transmitter-receiver(bistatic)pairs cannot be fused for further use.In this paper,we propose a quantity named quasi-echo-power(QEP)as well as a method for eliminating differences of this quantity among different transmitter-receiver(bistatic)pairs.The QEP is defined as the target echo power after being compensated for distance and pattern propagation factor.The proposed method estimates the station difference coefficients(SDCs)of transmitter-receiver(bistatic)pairs relative to the reference transmitter-receiver(bistatic)pair first.Then,it compensates the QEP and gets the compensated QEP.The compensated QEP possesses a linear relationship with the target RCS.Statistical analyses on the simulated and real-life QEP data show that the proposed method can effectively estimate the SDC between different stations,and the compensated QEP from different receiving stations has the same distribution characteristics for the same target.

关键词： data fusion multistatic passive radar radar cross section(RCS) target characteristic

Crystallization thermodynamics of 2,4(5)-dinitroimidazole in eleven pure solvents

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Chinese Journal of Chemical Engineering 2022年第8期35卷 236-243页

作者： Pengbao Lian Lizhen Chen Daozhen Huang jianxin Xu Zishuai Xu Cai cao Jiaxiang Zhao Jianlong Wang School of Chemical Engineering and Technology North University of ChinaTaiyuan 030051China Shandong Teneng Environmental Technology Co. Ltd.Dezhou 253000China Gansu Yinguang Chemical Industry Group Co. Ltd.Baiyin 730900China

2,4(5)-Dinitroimidazole(2,4(5)-DNI) is an important energetic material, and it is also an important precursor for the preparation of drugs and energetic materials. In this study, the solubility of 2,4(5)-DNI in eleven pure solvents(chlorobenzene, benzene, 1,2-dichloroethane, toluene, water, isopropyl alcohol,ethyl acetate, acetonitrile, methanol, 1,4-dioxane and acetone) were measured by using a dynamic test method from 278.15 K to 323.15 K under 101.1 kPa. Four solubility models were used to fit the experimental data, which were ideal model, modified Apelblat equation, polynomial empirical equation, and λh equation. Meanwhile, the relative average deviation and root-mean-square deviation between the experimental data and the fitted data were also calculated. Furthermore, the three thermodynamic parameters,i.e., dissolution enthalpy, dissolution entropy and Gibbs energy were obtained based on solubility data.Finally, the crude product of 2,4(5)-DNI was crystallized with acetone as solvent, and the purity of the crystalline product was greater than 99.5%.

关键词： 2,4(5)-Dinitroimidazole Solid-liquid equilibrium Solubility model Three thermodynamic parameters Cooling crystallization

MLST analysis of genetic diversity of Bacillus coagulans strains to evaluate effects on constipation model

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Food Science and Human Wellness 2022年第4期11卷 815-827页

作者： Jiang cao Wenyin Liu Ruolan Liliu jianxin Zhao Hao Zhang Wei Chen Qixiao Zhai State Key Laboratory of Food Science and Technology Jiangnan UniversityWuxi 214122China School of Food Science and Technology Jiangnan UniversityWuxi 214122China National Engineering Research Center for Functional Food Jiangnan UniversityWuxi 214122China Wuxi Translational Medicine Research Center and Jiangsu Translational Medicine Research Institute Wuxi Branch Wuxi 214122China

Bacillus coagulans can help ameliorate or prevent gastrointestinal diseases, but the genetic relationships among B. coagulans isolates are not well studied. Multilocus sequence typing analysis was conducted on 57 isolates of B. coagulans from 22 provinces or autonomous regions in China. B. coagulans isolates were highly diverse and a total of 33(sequence typings) STs were found. These isolates had a weak clonal population structure and strong indications of intraspecies recombination. The evolution direction of B. coagulans was not correlated with geography or isolation source. Fifteen strains were selected for further analysis based on proximity relationships from the phylogenetic tree. Five isolates(B. coagulans-1, B. coagulans-10, B. coagulans-39, B. coagulans-70 and B. coagulans-71) with good spore-forming ability relative to the rest of the isolates were evaluated for constipation relief. B. coagulans-39 significantly relieved constipation symptoms in mice by regulating intestinal flora, increasing the production of short-chain fatty acids and restoring the level of gastrointestinal regulatory peptides. Comparative genomic analysis showed the beneficial effects of B. coagulans-39 might be associated with specific functional genes that are involved in the utilization of various carbohydrates as primary substrates and short-chain fatty acid production.

关键词： Bacillus coagulans Multilocus sequence typing Housekeeping gene Constipation Strain-specific