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Partition of polycyclic aromatic hydrocarbons on organoben-tonites from water

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Journal of Environmental Sciences 2001年第2期13卷 129-136页

作者： CHEN Bao-liang ZHU Li-zhong department of Environmental Science Zhejiang UniversityHangzhou 310028China

A series of organobentonites synthesized by exchanging organic ration such as dodecyltri-methylammonium ( dTMA), benzyldimethyltetradecylammonium (BdTdA), cetyltrimethyl-ammonium (CTMA), octodeyltrimethylammonium (OTMA) on bentonite The optimal condition, properties and mechanisms for the organobentonites to sorb phenanthrene, anthracene, naphthalene, acenaphthene in water were investigated in detail. The partition behavior was determined for four polycyclic aromatic hydrocarbons (PAHs), such as naphthalene, phenanthrene, anthracene and acenaphthene, from water to a series of organobentortites. The interlayer spacings and organic carbon contents of organobentonites, removal rate and sorption capacities for organobentonites to treat phenanthrene, anthracene, naphthalene, acenaphthene were correlated to the length of alkyl chains and the amounts of ration surfactant exchanged on the bentonite. Phenanthrene, anthracene, naphthalene, and acenaphthene sorption to organobentonites were characterized by linear isotherms, indicating solute partition between water and the organic phase composed of the large alkyl functional groups of quaternary ammonium rations. PAHs distribution coefficients (K-d) between organobentonites and water were proportional to the organic carbon contents of organobentonites. However, the partition coefficients ( K-oc) were nearly constants for PAHs in the system of organobentonite-water. The K-ocx of phenanthrene, anthracene, naphthalene, acenaphthene were 2.621 x 10(5), 2.106 x 10(5), 2.247 x 10(4), 5.085 x 10(4), respectively. The means K-oc values on the organobentonites are about ten to twenty times larger than the values on the soils/sediments, what is significant prerequisite for organobentonite to apply to remediation of pollution soil and groundwater. The sorption mechanism was also evaluated from octanol-water partition coefficients and aqueous solubility of PAHs. The correlations between 1gK(oc) and 1gK(ow), 1gK(oc) and 1gS for PAHs in th

关键词： organobentonites polycyclic aromatic hydrycarbons partition

dynamic deformation Behaviors and Constitutive Relations of High-Strength Weldox700E Steel

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Acta Mechanica Solida Sinica 2019年第4期32卷 431-445页

作者： Xianzhe zhong Yongming Yan Qingming Zhang State Key Laboratory of Explosion Science and Technology Beijing Institute of TechnologyBeijing 100081 China Institute for Special Steels Central Iron and Steel Research InstituteBeijing 100081China

High-strength Weldox700E steel has been increasingly applied to dynamic environment because of its high strength and good toughness. The plastic deformation behaviors of Weldox700E steel at strain rates ranging from 10^-4 to 6200 s^-1 are investigated by the quasistatic and dynamic uniaxial compression tests. The Weldox700E steel exhibits rate-related plastic behavior, work hardening and thermal softening behaviors. due to the nonlinear strain rate effect of the material and the adiabatic temperature rise caused by high-speed impact compression, the properties of material are greatly affected. By improving the strain rate enhancement term and temperature term in the Johnson-Cook constitutive model, a new constitutive model was proposed to describe the dynamic mechanical behavior of Weldox700E steel. This constitutive equation was implemented into the finite element software, ABAQUS, via an explicit user material subroutine utilizing the stress update algorithm. The simulation results at different strain rates were in good agreement with the experimental data, verifying the validity of the constitutive model.

关键词： KEY Weldox700E steel Split-Hopkinson pressure bar Improved Johnson-Cook model Simulation

Chinese medicine formulas for nonalcoholic fatty liver disease: Overview of systematic reviews

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World Journal of Clinical Cases 2021年第1期9卷 102-117页

作者： Liang dai Wen-Jun Zhou Linda L d.zhong Xu-dong Tang Guang Ji Institute of digestive diseases Longhua HospitalShanghai University of Traditional Chinese MedicineShanghai 200032China Hong Kong Chinese Medicine Clinical Study Centre School of Chinese MedicineHong Kong Baptist UniversityHong KongChina department of Gastroenterology Xiyuan Hospital of China Academy of Chinese Medical SciencesBeijing 100091China

BACKGROUNd Nonalcoholic fatty liver disease(NAFLd)affects more than one-quarter of the global *** to the lack of approved chemical agents,many patients seek treatment from traditional Chinese medicine(TCM)formulas.A variety of systematic reviews have been published regarding the effectiveness and safety of TCM formulas for *** To critically appraise available systematic reviews and sort out the high-quality evidence on TCM formulas for the management of *** Seven databases were systematically searched from their inception to 28 February *** search terms included“non-alcoholic fatty liver disease,”“Chinese medicines,”“systematic review,”and their *** reviews involving TCM formulas alone or in combination with conventional medications were *** methodological quality and risk of bias of eligible systematic reviews were evaluated by using A Measure Tool to Assess Systematic Reviews 2(AMSTAR 2)and Risk of Bias in Systematic Review(ROBIS).The quality of outcomes was assessed by the Grading of Recommendations Assessment,development and Evaluation(GRAdE)*** Seven systematic reviews were ultimately *** systematic reviews were conducted based on randomized controlled trials and published in the last *** to the AMSTAR 2 tool,one systematic review was judged as having a moderate confidence level,whereas the other studies were rated as having a low or extremely low level of *** ROBIS tool showed that the included systematic reviews all had a high risk of bias due to insufficient consideration of identified *** to the GRAdE system,only two outcomes were determined as high quality;namely,TCM formulas with the HuoXueHuaYu principle were better than conventional medications in ultrasound improvement,and TCM formulas were superior to antioxidants in alanine aminotransferase *** outcomes were downgraded to lower levels,mainly because of heterogeneity amon

关键词： Nonalcoholic fatty liver disease Traditional Chinese medicines Systematic review Meta-analysis Overview Grading of recommendations assessment,development and evaluation system

An algorithm for identifying symmetric variables based on the order eigenvalue matrix

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Frontiers of Information Technology & Electronic Engineering 2017年第10期18卷 1644-1653页

作者： Xiao-hua LI Ji-zhong SHEN Campus Information Center Zhejiang University Hangzhou 310027 China College of lnformation Science & Electronic Engineering Zhejiang University Hangzhou 310027 China

To simplify the process for identifying 12 types of symmetric variables in Boolean functions, we propose a new symmetry detection algorithm based on minterm expansion or the truth table. First, the order eigenvalue matrix based on a truth table is defined according to the symmetry definition of a logic variable. By analyzing the constraint conditions of the order eigenvalue matrix for 12 types of symmetric variables, an algorithm is proposed for identifying symmetric variables of the Boolean function. This algorithm can be applied to identify the symmetric variables of Boolean functions with or without don't-care terms. The proposed method avoids the restriction by the number of logic variables of the graphical method, spectral coefficient methods, and ANd-XOR expansion coefficient methods, and solves the problem of completeness in the fast computation method. The algorithm has been implemented in C language and tested on MCNC91 benchmarks. The application results show that, compared with the traditional methods, the new algorithm is an optimal detection method in terms of the applicability of the number of logic variables, the Boolean function including don't-care terms, detection type, and complexity of the identification process.

关键词： Boolean function Symmetric variable Boolean logic algebra system Order eigenvalue matrix Truth table

Size Effect in Ferroelectric Long Cylinders

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Chinese Physics Letters 1995年第2期12卷 110-112页

作者： WANG Yuguo ZHANG Peilin WANG Chunlei zhong Weilie N.Napp d.R.Tilly department of Physics Shandong UniversityJinan 250100 department of Physics University of EssexWivenhoe ParkColchester CO43SQEngland

The Curie temperature and polarization in a ferroelectric cylinder with infinite length have been examined using Landau free energy *** Curie temperature and polarization decrease with decreasing cylinder diameter for the positive extrapolation length,and reach zero at the critical *** negative extrapolation length,both Curie temperature and polarization increase with decreasing cylinder diameter.

关键词： expansion cylinder extrapolation

The Effect of Moisture in different Altitude Layers on the Eastward Propagation of MJO

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Journal of Meteorological Research 2024年第3期38卷 437-452页

作者： Xiaoyu ZHU zhong zhong Yimin ZHU Yunying LI Yijia HU Yao HA College of Meteorology and Oceanography National University of Defense TechnologyChangsha410000China Key Laboratory for Virtual Geographic Environment School of Geography ScienceNanjing Normal UniversityNanjing210023China Jiangsu Collaborative Innovation Center for Climate Change School of Atmospheric SciencesNanjing UniversityNanjing210000China

In this study,driven by ERA5 reanalysis data,the Weather Research and Forecasting(WRF)version 4.0 was used to investigate the eastward propagation of the Madden-Julian oscillation(MJO)in the tropical atmosphere during december-February(dJF)of 2007/*** experiment with 11 cumulus parameterization schemes respectively shows that the Grell 3d scheme is one of several worse ones in describing MJO *** addition,still by use of the Grell 3d scheme,four nudging assimilation experiments for water vapor in all model vertical layers(Ndg_all),lower layers(Ndg_low),middle layers(Ndg_mid),and upper layers(Ndg_upp)were *** is found that when the water vapor in the model approaches to the observed value,the model performance for MJO activities is improved *** the four nudging simulations,Ndg_all certainly performs *** Ndg_mid is important for the MJO-filtered profiles related to moisture,Ndg_low and Ndg_upp exhibit superiority to Ndg_mid in simulating MJO eastward ***_low has advantages when MJO features are represented by zonal wind at 850 hPa and precipitation because the lower-level MJO-filtered moisture is conducive to the existence of lower-level condensational heating to the east of the MJO convective ***_upp performs better when describing the MJO eastward propagation features by outgoing longwave radiation(OLR)since it can capture the moisture and cloud top temperature of deep convection associated with MJO,as well as front Walker *** results suggest that the lower-level moisture is more important in regulating the MJO eastward propagation,and the observed maximum MJO-filtered moisture in the middle troposphere might be a phenomenon accompanying the MJO deep convection,but not a factor controlling its eastward propagation.

关键词： Madden-Julian oscillation(MJO) nudging technique Weather Research and Forecasting(WRF)model vertical moisture structure

Triboelectric nanogenerators as wearable power sources and self-powered sensors

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National Science Review 2023年第1期10卷 28-48页

作者： Xiong Pu Chi Zhang zhong Lin Wang CAS Center for Excellence in Nanoscience Beijing Key Laboratory of Micro-Nano Energy and Sensor Beijing Institute of Nanoenergy and NanosystemsChinese Academy of Sciences School of Nanoscience and Technology University of Chinese Academy of Sciences School of Materials Science and Engineering College of EngineeringGeorgia Institute of Technology

Smart we arable technologies are augmenting human bodies beyond our biological capabilities in communication,healthcare and *** supply and information acquisition are essential for wearable electronics,whereas the increasing demands in multifunction are raising the requirements for energy and sensor *** triboelectric nanogenerator(TENG),proven to be able to convert various mechanical energies into electricity,can fulfill either of these two functions and therefore has drawn extensive attention and research efforts *** everyday life of a human body produces considerable mechanical energies and,in the meantime,the human body communicates mainly through mechanical signals,such as sound,body gestures and muscle ***,the TENG has been intensively studied to serve as either wearable sources or wearable self-powered ***,the recent finding on the fundamental understanding of TENGs is revisited briefly,followed by a summary of recent advancements in TENG-based wearable power sources and self-powered *** challenges and prospects of this area are given as well.

关键词： triboelectric nanogenerators power sources self-powered sensors wearable electronics

Self-powered versatile shoes based on hybrid nanogenerators

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Nano Research 2018年第8期11卷 3972-3978页

作者： Long Liu Wei Tang Chaoran deng Baodong Chen Kai Han Wei zhong zhong Lin Wang CAS Center for Excellence in Nanoscience Beijing Key Laboratory of Micro-nano Energy and Sensor Beijing Institute of Nanoenergyand Nanosystems Chinese Academy of Sciences Beijing 100083 China School of Nanoscience and Technology University of Chinese Academy of Sciences Beijing 100049 China School of Materials Science and Engineering Georgia Institute of Technology Atlanta GA 30332-0245 USA Long Liu Wei Tang and Chaoran Deng contributed equally to this work.

A triboelectric nanogenerator （TENG） and an electromagnetic generator （EMG） were hybridized to harvest the human mechanical energy. By an effective conjunction of triboelectrificafion and electromagnetic induction, the hybridized nanogenerator with a radius of 2 cm and height of 1.2 cm could charge a 1,000 bkF capacitor to 5.09 V after 100 cycles of vibration. This mini-sized hybrid nanogenerator could then be embedded in shoes to serve as an energy cell. Typical outdoor applications--including driving with a Global Positioning System （GPS） device, charging a Li-ion battery and a cell phone--were successfully demonstrated, suggesting its potential application in smart wearable electronics and future suits of soldiers.

关键词： triboelectric nanogenerators electromagneticgenerators hybrid nanogenerators

WORMHOLE ANd THE dIMENSIONALITY OF SPACETIME IN EINSTEIN-GAUGE THEORIES

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Chinese Physics Letters 1990年第6期7卷 248-251页

作者： LI Xinzhou zhong Yu East China Institute for Theoretical Physics Shanghai 200237 East China University of Chemical Technology Shanghai200237

The wormhole effect is discussed in the d-dimensional Einstein-Yang-Mills *** show that the peak of the probability function leads to the explanation of the spontaneous compactification down to a four-dimensional spacetime and vanishing four-dimensional cosmological constant,i.e.,the observable spacetime must be four-dimensional and flat.

关键词： theory SPACE dimensional