检索结果-南通市图书馆

Effects of oxidants on the degradation of tributyl phosphate under supercritical water oxidation conditions

在线全文

学校读者我要写书评

暂无评论

Nuclear Science and Techniques 2022年第3期33卷 160-171页

作者： Qiang Qin xiao-bin Xia Shi-bin Li Shuai Wang Hong-Jun Ma Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China University of Chinese Academy of Sciences Beijing 100049China

The effects of additional oxidants,such as NaNO_(3),Na_(2)S_(2)O_(3),KClO_(4),and K_(2)Cr_(2)O_(7),on the supercritical water oxidation(SCWO)of tributyl phosphate(TBP)were *** coupling of an ionic oxidant with SCWO can effectively enhance the oxidative degradation ability of the system,thus increasing its organic-matter-removal efficiency at a reduced reaction ***,the addition of NaNO_(3),KClO_(4),or K_(2)Cr_(2)O_(7)could improve this efficiency at a reaction temperature of 500℃compared with that of the original system at 550℃.Additionally,based on the conditions adopted in this study,the addition of either of these oxidants could reduce the final total organic carbon(TOC)of the effluent from~500 to99%.The effects of the ionic oxidants on the gas products,including CO_(2),CO,H_(2),and CH_(4),as well as other organic gases,have also been *** these gas products,CO_(2)accounted for the main gas product with a proportion of more than ***<500℃,temperature significantly affected the as products(CO,H_(2),CH_(4),and other organic gases).However,the gas product was mainly CO_(2)when the temperature was increased to≥500℃.This study initially revealed the enhancement effect of ionic oxidants on SCWO,which still requires further research.

关键词： Supercritical water oxidation Ionic oxidant Organic wastes

Decomposition of oil cleaning agents from nuclear power plants by supercritical water oxidation

在线全文

学校读者我要写书评

暂无评论

Nuclear Science and Techniques 2022年第4期33卷 83-95页

作者： Shi-bin Li xiao-bin Xia Qiang Qin Shuai Wang Hong-Jun Ma Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China University of Chinese Academy of Sciences Beijing 100049China

Oil cleaning agents generated from nuclear power plants(NPPs)are radioactive organic liquid *** date,because there are no satisfactory industrial treatment measures,these wastes can only be stored for a long *** this work,the optimization for the supercritical water oxidation(SCWO)of the spent organic solvent was *** main process parameters of DURSET(oil cleaning agent)SCWO,such as temperature,reaction time,and excess oxygen coefficient,were optimized using response surface methodology,and a quadratic polynomial model was *** determination coefficient(R^(2))of the model is 0.9812,indicating that the model is *** optimized process conditions were at 515 C,66 s,and an excess oxygen coefficient of 211%.Under these conditions,the chemical oxygen demand removal of organic matter could reach 99.5%.The temperature was found to be the main factor affecting the SCWO *** and benzene-based compounds may be the main intermediates in DURSET *** work provides basic data for the industrialization of the degradation of spent organic solvents from NPP using SCWO technology.

关键词： Supercritical water oxidation Oil cleaning agent Nuclear power plants Response surface methodology

Optimum Tilt Angle of Flow Guide in Steam Turbine Exhaust Hood Considering the Effect of Last Stage Flow Field

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Mechanical Engineering 2017年第4期30卷 866-875页

作者： Lihua CAO Aqiang LIN Yong LI bin xiao School of Energy and Power Engineering Northeast Dianli UniversityJilin 132012China

Abstract Heat transfer and vacuum in condenser are influenced by the aerodynamic performance of steam tur- bine exhaust hood. The current research on exhaust hood is mainly focused on analyzing flow loss and optimal design of its structure without consideration of the wet steam condensing flow and the exhaust hood coupled with the front and rear parts. To better understand the aerodynamic performance influenced by the tilt angle of flow guide inside a diffuser, taking a 600 MW steam turbine as an example, a numerical simulator CFX is adopted to solve compressible three-dimensional （3D） Reynolds time-aver- aged N-S equations and standard k-e turbulence model. And the exhaust hood flow field influenced by different tilt angles of flow guide is investigated with consideration of the wet steam condensing flow and the exhaust hood coupled with the last stage blades and the condenser throat. The result shows that the total pressure loss coefficient and the static pressure recovery coefficient of exhaust hood change regularly and monotonously with the gradual increase of tilt angle of flow guide. When the tilt angle of flow guide is within the range of 30~ to 40~, the static pressure recovery coefficient is in the range of 15.27% to 17.03% and the total pressure loss coefficient drops to approximately 51%, the aerodynamic performance of exhaust hood is significantly improved. And the effectiveenthalpy drop in steam turbine increases by 0.228% to 0.274%. It is feasible to obtain a reasonable title angle of flow guide by the method of coupling the last stage and the condenser throat to exhaust hood in combination of the wet steam model, which provides a practical guidance to flow guide transformation and optimal design in exhaust hood.

关键词： Steam turbine Exhaust hood Last stageblades Tilt angle of flow guide Aerodynamicperformance

Signifying quantum uncertainty relations by optimal observable sets and the tightest uncertainty constants

在线全文

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2024年第9期67卷 43-50页

作者： xiao-bin Liang Bo Li Shao-Ming Fei School of Mathematics and Computer Science Shangrao Normal UniversityShangrao 334001China Quantum Information Research Center Shangrao Normal UniversityShangrao 334001China School of Mathematical Sciences Capital Normal UniversityBeijing 100048China

Quantum uncertainty relations constrain the precision of measurements across multiple non-commuting quantum mechanical ***,we introduce the concept of optimal observable sets and define the tightest uncertainty constants to accurately describe these measurement *** any quantum state,we establish optimal sets of three observables for both product and summation forms of uncertainty relations,and analytically derive the corresponding tightest uncertainty *** demonstrate that the optimality of these sets remains consistent regardless of the uncertainty relation ***,the existence of the tightest constants excludes the validity of standard real quantum mechanics,underscoring the essential role of complex numbers in this ***,our findings resolve the conjecture posed in[***.118,180402(2017)],offering novel insights and potential applications in understanding preparation uncertainties.

关键词： uncertainty relation the tightest uncertainty constants optimal observable sets

Image Analysis by Two Types of Franklin-Fourier Moments

在线全文

学校读者我要写书评

暂无评论

IEEE/CAA Journal of Automatica Sinica 2019年第4期6卷 1036-1051页

作者： bing He Jiangtao Cui bin xiao Xuan Wang the School of Computer Science and Technology Xidian UniversityXi’an 710071China the School of Physics and Electrical Engineering WeiNan Normal UniversityWeinan 714000China the Key Laboratory of Computational Intelligence Chongqing University of Posts and TelecommunicationsChongqing 400065China the School of Physics and Information Technology Shaanxi Normal UniversityXi’an 710062China

In this paper,we first derive two types of transformed Franklin polynomial:substituted and weighted radial Franklin *** radial orthogonal moments are proposed based on these two types of polynomials,namely substituted Franklin-Fourier moments and weighted Franklin-Fourier moments(SFFMs and WFFMs),which are orthogonal in polar *** radial kernel functions of SFFMs and WFFMs are transformed Franklin functions and Franklin functions are composed of a class of complete orthogonal splines function system of degree ***,it provides the possibility of avoiding calculating high order polynomials,and thus the accurate values of SFFMs and WFFMs can be obtained directly with little computational *** and experimental results show that Franklin functions are not well suited for constructing higher-order moments of SFFMs and WFFMs,but compared with traditional orthogonal moments(e.g.,BFMs,OFMs and ZMs)in polar coordinates,the proposed two types of Franklin-Fourier Moments have better performance respectively in lower-order moments.

关键词： Franklin functions image reconstruction moment invariants object recognition orthogonal moments

Modeling droplet vaporization and combustion with the volume of fluid method at a small Reynolds number

在线全文

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2012年第5期13卷 361-374页

作者： xiao-bin ZHANG Wei ZHANG Xue-jun ZHANG Institute of Refrigeration and Cryogenics Zhejiang University Hangzhou 310027 China

The volume of fluid(VOF) formulation is applied to model the combustion process of a single droplet in a hightemperature convective air free stream *** calculations solve the flow field for both phases,and consider the droplet deformation based on an axisymmetrical *** chemical reaction is modeled with one-step finite-rate mechanism and the thermo-physical properties for the gas mixture are species and temperature dependence.A mass transfer model applicable to the VOF calculations due to vaporization of the liquid phases is developed in consideration with the fluctuation of the liquid *** model is validated by examining the burning rate constants at different convective air temperatures,which accord well with experimental data of previous *** phenomena from the simulations,such as the transient history of droplet deformation and flame structure,are also qualitatively accordant with the descriptions of other numerical ***,a different droplet deformation mechanism for the low Reynolds number is explained compared with that for the high Reynolds *** calculations verified the feasibility of the VOF computational fluid dynamics(CFD) formulation as well as the mass transfer model due to vaporization.

关键词： Droplet Vaporization Combustion process Volume of fluid(VOF) Numerical simulation

Cell replacement for Parkinson's disease:advances and challenges

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2023年第12期18卷 2693-2694页

作者： bin xiao Eng-King Tan Department of Neurology National Neuroscience InstituteSingapore Neuroscience and Behavioral Disorders Program Duke-NUS Medical SchoolSingapore

Parkinson's disease(PD), characterized by the loss of dopaminergic(DA) neurons in the substantia nigra pars compacta(SNpc) of the midbrain, is a prototype neurological disease that is suitable for cellular replacement therapy. Levodopa has been utilized to replace the insufficient dopamine released by degenerating DA neurons since the 1960s and it remains the cornerstone of PD treatment. However, as the disease progresses.

关键词： dopamine corners replace

Synthesis of N,O-rich active site porous polymers and their efficient recovery of Gd(Ⅲ) from solution

在线全文

学校读者我要写书评

暂无评论

Journal of Rare Earths 2023年第9期41卷 1419-1428,I0006页

作者： bin xiao Lijinhong Huang Jiacai Ou bin Zeng Zhiqiang Zou Xiangrong Zeng Wanfu Huang School of Resource and Environmental Engineering Jiangxi University of Science and TechnologyGanzhou 341000China School of Resources and Architectural Engineering Gannan University of Science and TechnologyGanzhou 341000China Faculty of Science and Engineering WA School of Mines:MineralsEnergy and Chemical EngineeringCurtin UniversityWAAustralia School of Architecture and Design Jiangxi University of Science and TechnologyGanzhou 341000China

Our previous study found that the adsorption performance of porous carbon for Gd(Ⅲ) could be significantly improved by increasing the N,and O functional groups on its ***,the adsorption capacity of porous carbon is low due to the limited number of N,and O functional groups that can be loaded on its *** to the advantage of customizable functional groups of porous organic polymers(POPs),the triazine-based Tb-MEL and hydroxyl-modified triazine-based Tp-MEL were synthesized by a one-step hydrothermal method using nitrogen-rich melamine as the raw material and triformylbenzene(Tb) and 2,4,6-triformylphloroglucinol(Tp),*** Gd(Ⅲ) adsorption isotherms and kinetic curves of Tb-MEL,and Tp-MEL at pH=6 and T=25℃ are in high agreement with the Langmuir isotherm(R^(2)>0.998) and pseudo-second-order kinetics(R^(2)>0.993),*** fitted maximum adsorption capacity(q_(max)) is about 136.05 mg/g,much higher than 58.38 mg/g of *** adsorption efficiency for Gd(Ⅲ) at pH=7 is close to 100%,and Tp-MEL maintains 62.4% of the initial adsorption capacity after ten cycle s of sorption/desorption of Gd(Ⅲ),with an average elution efficiency of more than 90%.Adsorption selection performance tests show that Tp-MEL has good adsorption selectivity for HREE ions,and the selectivity is as follows:Lu^(3+)>Y^(3+)>Gd^(3+)>Nd^(3+)>La^(3+)>Al^(3+)>Ca^(2+)>Mg^(2+).Batch adsorption,Brunauer-Emmett-Teller(BET) method,and X-ray photoelectron spectrometer(XPS)tests show that hydroxyl modifications lose the specific surface area of the polymer,and the functional groups contribute more to the adsorption performance than the specific surface area.

关键词： N O functional groups Triazine-based Hydroxyl-modified Adsorption performance Rare earths

The mechanism of liquid dispersing from a cylinder driven by central dynamic shock loading

在线全文

学校读者我要写书评

暂无评论

Defence Technology（防务技术） 2021年第4期17卷 1313-1325页

作者： Lei Li xiao-xia Lu xiao-bin Ren Ye-jun Ren Shou-tian Zhao xiao-fang Yan State Key Laboratory of NBC Protection for Civilian Beijing102205China School of Aerospace Engineering Tsinghua UniversityBeijing100084China

A systematic investigation on the mechanism of dynamic liquid dispersing process via theoretical and experimental approach is *** experiments include weak and strong constrained scenarios using the high-speed camera technique and the flash X-ray radiography *** on dynamic analysis,one-dimensional characteristics analysis and some numerical simulations on the propagating processes of blast waves before the container shell rupturing,further and detailed analyses of the experimental results are *** effects of the liquid viscosity on the dynamic dispersing flow are also analyzed,and the spall fracture mechanism is ***,the dominating forces determining the dispersing liquid flow are revealed,that is,the stretching and shearing action due to the interaction of two reflecting rarefaction waves in opposite propagating *** influence of container shell strength on the dispersing liquid flow is also investigated,and the characters of cavitation layered in liquid before shell rupturing are *** revealed that different shell material results in different cavitating *** the different cavitating layers drive the different dynamic liquid dispersing process coming into *** metastable liquid states caused by pressure drop and cavitation generation are discussed.

关键词： Shell effects Reflected rarefaction waves Liquid spall fracture Liquid dispersing Shock waves Cavitation layered