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Constructing porous ZnFC-PA/PSF composite spheres for highly efficient Cs^(+) removal

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Journal of Environmental Sciences 2024年第9期143卷 126-137页

作者： Senjian Han Chao Gao Wenfeng Yan Yafei Guo shiqiang wang Tianlong Deng College of Marine and Environmental Sciences Tianjin University of Science and TechnologyTianjin 300457China Key Laboratory of Marine Resource Chemistry and Food Technology Ministry of EducationTianjin 300457China

Radioisotope leaking from nuclear waste has become an intractable problem due to its gamma radiation and strong water *** this work,a novel porous ZnFC-PA/PSF composite sphere was fabricated by immobilization of ferrocyanides modified zinc phytate into polysulfone(PSF)substrate for the treatment of Cs-contaminated *** maximum adsorption capacity of ZnFC-PA/PSF was 305.38 mg/g,and the removal efficiency of Cs+was reached 94.27%within 2 *** ZnFC-PA/PSF presented favorable stability with negligible dissolution loss of Zn^(2+)and Fe^(2+)(<2%).The ZnFC-PA/PSF achieved high-selectivity towards Cs+(K_(d)=2.24×10^(4)mL/g)even in actual geothermal *** adsorption mechanism was inferred to be the ion-exchange between Cs^(+)and K^(+).What’s more,ZnFC-PA/PSF worked well in the fixed-bed adsorption(E=91.92%),indicating the application potential for the hazardous Cs^(+)removal from wastewater.

关键词： Adsorption Cesium Metal ferrocyanide Composite adsorbent

Thermal Characteristics of Room Temperature Inorganic Phase Change System Containing Calcium Chloride

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Chemical Research in Chinese Universities 2015年第3期31卷 452-456页

作者： GAO Daolin GUO Yafei YU Xiaoping wang shiqiang DENG Tianlong Tianjin Key Laboratory of Marine Resources and Chemistry College of Marine Science and EngineeringTianjin University of Science and Technology Tianjin 300457 P.R.China

A novel inorganic calcium-based phase change material（PCM-Ca） consisted of 47.1%（mass fraction） water, 47.7% calcium chloride, 2% potassium nitrate, 2% potassium bromide and 1.2% strontium chloride with a solid-liquid phase change temperature of 21.4 ℃ was investigated systematically. Among the components of PCM-Ca, calcium chloride and water act as the latent heat storage materials, and potassium nitrate, potassium bromide and strontium chloride work as the modifier, thickener and nucleating agent, respectively. Thermochemical properties including melting point, latent heat, density and thermal conductivity of the PCM-Ca were measured experimentally. The experimental results indicate that the melting latent heat, thermal conductivity at the melting point and density at room temperature for the PCM-Ca are 203.3 kJ/kg, 1.3637 W·m-1·K-l and 1.55×103 kg/m3, respectively. Moreover, a thirty-run-cycling test showed that the PCM-Ca has a good thermal characteristic with no phase segregation or supercooling, and the maximum deviations of latent heat and phase change temperature are only 0.2% and 1.6%, respectively.

关键词： Phase change material Calcium chloride Latent heat Thermal conductivity

Block copolymer assisted topochemical polymerization:A facile and efficient route to robust polymeric nanoporous membranes decorated with versatile amino acids

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Chinese Chemical Letters 2020年第3期31卷 885-889页

作者： Yun Liang Wanyue Ouyang Peng wang Wanlin Zhang shiqiang wang Li Tian Yong Ju Guangtao Li Key Lab of Organic Optoelectronics and Molecular Engineering Department of ChemistryTsinghua UniversityBeijing 100084China

Based on block copolymer assisted topochemical polymerization,a new strategy for facilely producing robust nanoporous membranes with controlled incorporation of functional groups onto nanopores is *** exemplified by preparing nanoporous polypyrrole decorated with amino acids,this strategy exhibits a high degree of freedom for tailoring the surface functionality in the created pores.

关键词： Block copolymer Supramolecular ensemble Topochemical polymerization Nanoporous membranes Pore functionalization

Effect of power parameters on microdischarge induced by corona discharge

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Plasma Science and Technology 2019年第5期21卷 60-65页

作者： Yinxia GUAN shiqiang wang Shiya TANG Hongxiang MU Quanzhen LIU State Key Laboratory of Safety and Control for Chemicals Qingdao 266000People's Republic of China Sinopec Research Institute of Safety Engineering Qingdao 266000People's Republic of China

This research mainly describes the generation and diagnosis of plasma using a wire-plate discharge device driven by different power supplies, aimed at investigating the effect of driving source parameters on micro-discharge induced by a corona. The influence of parameters such as waveform, duty ratio and bias voltage on discharge characteristics was explored *** results show that the determination of volt-ampere characteristics under different driving source waveforms indicates that the application of square and pulse waveforms shows great advantages over that of sawtooth and sinusoidal waveforms. Similarly, the photo-thermal effects of the system were investigated by comparing the high-voltage electrode temperature and relative emission intensity of N2(C3Пu → B3Пg, 0–0, 337 nm), where square and pulse waveforms also achieved better performance. But the pulse waveform had a slight advantage over the square waveform in terms of energy conversion. Further, investigations of the duty ratio and bias voltage applied on the pulse waveform were conducted, and the results indicate that the duty ratio could effectively improve the discharge power and thermal effect to a certain extent;however, the application of bias voltage on the pulse signal had little influence on the discharge power and thermal effect.

关键词： photo-thermal effect duty ratio bias voltage waveforms micro-discharge

Speed Measurement Feasibility by Eddy Current Effect in the High-Speed MFL Testing

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Structural Durability & Health Monitoring 2023年第4期17卷 299-314页

作者： Zhaoting Liu Jianbo Wu Sha He Xin Rao shiqiang wang Shen wang Wei Wei School of Mechanical Engineering Sichuan UniversityChengdu610065China Safety Environment Quality Surveillance and Inspection Research Institute of CNPC Chuanqing Drilling&Exploration Guanghan618300China Chengdu Xionggu Oil&Gas Technology Co. Ltd.Chengdu610000China Chengdu Institute of Special Equipment Inspection and Testing Chengdu610036China

It is known that eddy current effect has a great influence on magnetic flux leakage testing(MFL).Usually,contacttype encoder wheels are used to measure MFL testing speed to evaluate the effect and further compensate testing *** speed measurement method is complicated,and inevitable abrasion and occasional slippage will reduce the measurement *** order to solve this problem,based on eddy current effect due to the relative movement,a speed measurement method is proposed,which is contactless and *** the high-speed MFL testing,eddy current induced in the specimen will cause an obvious modification to the applied *** modified field,which is measured by Hall sensor,can be utilized to reflect the moving ***,the measurement principle is illustrated based on Faraday’s ***,dynamic finite element simulations are conducted to investigate the modified magnetic field ***,laboratory experiments are performed to validate the feasibility of the proposed *** results show that Bmz(r1)and Bmx(r2)have a linear relation with moving speed,which could be used as an alternative measurement parameter.

关键词： Magnetic flux leakage testing(MFL) speed measurement eddy current effect modified magnetic field

The Goldbach 3-primes property for polynomial rings over certain infinite fields

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Chinese Science Bulletin 1998年第15期43卷 1256-1260页

作者： wang shiqiang Department of Mathematics, Beijing Normal University, Beijing 100875, China Department of Mathematics Beijing Normal University Beijing China

On the basis of Effinger and Hayes’ theorem about the Goldbach 3_primes property of polynomial rings F over finite fields F , by model_theoretic method it is proved that for each characteristic k (including 0), there... 详细信息

关键词： model theory polynomial 3 primes property.

Morphogenesis of T-tubules in heart cells: the role of junctophilin-2

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Science China(Life Sciences) 2013年第9期56卷 647-652页

作者： HAN Jing WU HaoDi wang QiWei wang shiqiang State Key Laboratory of Biomembrane and Membrane Biotechnology College of Life Sciences Peking University

The T-tubule (TT) system forms the structural basis for excitation-contraction coupling in heart and muscle cells. The morphogenesis of the TT system is a key step in the maturation of heart cells because it does not exist in neonatal cardiomyocytes. In the present study, we quantified the morphological changes in TTs during heart cell maturation and investigated the role of junctophilin-2 (JP2), a protein known to anchor the sarcoplasmic reticulum (SR) to TT, in changes to TT morphological parameters. Analysis of confocal images showed that the transverse elements of TTs increased, while longitudinal elements decreased during the maturation of TTs. Fourier transform analysis showed that the power of ~2 m spatial components increased with cardiomyocytes maturation. These changes were preceded by increased expression of JP2, and were reversed by JP2 knockdown. These findings indicate that JP2 is required for the morphogenesis of TTs during heart development.

关键词： T-tubules junctophilin-2 cardiomyocytes morphogenesis

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Synthesis of O-(2-[^(18)F]fluoroethyl)-L-tyrosine and its biological evaluation in B16 melanoma-bearing mice as PET tracer for tumor imaging

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Science China Chemistry 2007年第2期50卷 276-283页

作者： wang MingWei,YIN DuanZhi,LI shiqiang & wang YongXian Radiopharmaceutical Centre,Shanghai Institute of Applied Physics,Chinese Academy of Sciences,Shanghai 201800,China 1. Radiopharmaceutical Centre Shanghai Institute of Applied Physics Chinese Academy of Sciences Shanghai 201800 China

O-(2-[18F]fluoroethyl) -L-tyrosine([18F]FET) ,a fluorine-18 labeled analogue of tyrosine,has been syn-thesized and biologically evaluated in tumor-bearing mice. The whole synthesis procedure is com-pleted within 50 min. The radiochemical yield is about 40%(no decay corrected) and radiochemical purity more than 97% after simplified solid phase extraction. [18F]FET shows rapid,high uptake and long retention in the tumor as well as low uptake in the brain. The ratios of tumor-to-muscle(T/M) and tumor-to-blood(T/B) of [18F]FET are similar to those of [18F]FDG,but the ratios of tumor-to-brain(T/Br) are 2-3 times higher than that of [18F]FDG. Autoradiography of [18F]FET demonstrates a remarkable accumulation in melanoma with high contrast. It appears to be a probable competitive candidate for melanoma imaging with PET.

关键词： [18F]FET [18F]FDG PET imaging melanoma autoradiography

Caloric evaporation of the brine in Zangnan Salt Lake

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Frontiers of Chemical Science and Engineering 2011年第3期5卷 343-348页

作者： shiqiang wang Yafei GUO Nan ZHANG Lingzhong BU Tianlong DENG Mianping ZHENG Tianjin Key Laboratory of Marine Resources and Chemistry Tianjin University of Science and TechnologyTianjin 300457China Tianjin Centre of China Geological Survey at CGS Tianjin 300170China Key Laboratory of Saline Lake Resources and Environment in Ministry of Land and Resources Institute of Mineral Resources at Chinese Academy of Geological SciencesBeijing 100037China CAS Key Laboratory of Salt Lake Resources and Chemistry Qinghai Institute of Salt Lakes at CASXining 810008China

Zangnan Salt Lake on the south of the Tibet is a type of carbonate lake with high concentrations of lithium,boron,and potassium and obviously it differs from seawater in its chemical *** experimental simulation of the caloric evaporation of the lake’s brine was conducted byfirst freezing the brine and then performing isothermal evaporation at 288.15 *** freezing path and the physicochemical properties of the brine were *** crystallization sequence was natron,hydrohalite,halite,sylvite,zabuyelite,trona,aphthitalite,thermonatrite,and *** and cesium salts did not crystallized out but concentrated in the mother *** physicochemical properties(density,refractive index,conductivity,and pH)of the liquid phase changed as the evaporation *** the beginning of the evaporation processes,the concentration of potassium ions in the liquid phase gradually increased but later it decreased.A peak value of 55.21 g/L was obtained when the evaporation was 88%*** the mineral aphthitalite began to crystallize;the concentra-tions of B2O3,Li+,Rb+,and Cs+gradually increased as the evaporation *** the evaporation was 98%complete,their concentrations in the mother liquor were 40.77 g/L,4.838 g/L,400.17 mg/L and 31.95 mg/L,*** essential fundamental study can provide an important reference for the comprehensive utilization of brines in Zangnan Salt Lake.

关键词： Zangnan Salt Lake evaporation crystalliza-tion path freezing