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A Lattice Non-Perturbative Definition of an SO(10) Chiral Gauge Theory and Its Induced Standard Model

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Chinese Physics Letters 2013年第11期30卷 54-58页

作者： wen Xiao-gang Perimeter Institute for Theoretical Physics WaterlooOntario N2L 2Y5Canada Department of Physics Massachusetts Institute of TechnologyCambridgeMassachusetts 02139USA

The standard model is a chiral gauge theory where the gauge fields couple to the right-hand and the left-hand fermions *** standard model is defined perturbatively and describes all elementary particles(except gravitons)very ***,for a long time,we do not know if we can have a non-perturbative definition of the standard model as a Hamiltonian quantum mechanical *** we propose a way to give a modified standard model(with 48 two-component Weyl fermions)a non-perturbative definition by embedding the modified standard model into an SO(10)chiral gauge *** show that the SO(10)chiral gauge theory can be put on a lattice(a 3D spatial lattice with a continuous time)if we allow fermions to *** a non-perturbatively defined standard model is a Hamiltonian quantum theory with a finite-dimensional Hilbert space for a finite space *** generally,using the defining connection between gauge anomalies and the symmetry-protected topological orders,one can show that any truly anomaly-free chiral gauge theory can be non-perturbatively defined by putting it on a lattice in the same dimension.

关键词： theory gauge chiral

Urban stormwater disinfection, quality variability during storage and influence on the freshwater algae: Implications for reuse safety

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Journal of Environmental Sciences 2023年第2期124卷 655-666页

作者： Shanshan Fan gang wen An Liu College of Chemistry and Environmental Engineering Shenzhen UniversityShenzhen 518060China Shaanxi Key Laboratory of Environmental Engineering Xi’an University of Architecture and TechnologyXi’an 710055China Water Science and Environmental Engineering Research Center College of Chemistry and Environmental EngineeringShenzhen UniversityShenzhen 518060China

Stormwater reuse is one of the most important ways to mitigate water resource ***,urban stormwater contains many bacteria species,which threaten the reuse ***,stormwater disinfection is highly *** disinfection has been widely conducted in the drinking water and reclaimed water,it is rarely carried out for *** study collected the roof stormwater and undertook chlorination *** typical bacteria,Escherichia coli(***)and Staphylococcus aureus(***)were selected in this study to investigate the disinfection *** is found that bacteria species present in the stormwater had an important influence on disinfection efficiency while the original stormwater quality did not show an obvious ***,when the disinfected stormwater was stored,the stormwater quality was highly variable during its storage process and the variability was affected by bacteria *** *** containing stormwater showed a high variability of quality and *** significantly ***,the *** containing stormwater quality had a relatively low variability and *** did not significantly ***,it is noted that after storage,the dissolved form of stormwater was more positive to the freshwater algae’s growth while the particulate form(including bacteria and other particulate matters)was *** implies that a further treatment such as filtration is needed before the stored stormwater is recharged into receiving waters in order to remove particulate *** research outcomes can provide useful insight to effective stormwater disinfection and ensure reuse safety.

关键词： Stormwater quality Stormwater disinfection Stormwater storage Stormwater reuse Escherichia coli Staphylococcus aureus

Collective Directional Transport in Symmetric Periodic Potentials by Breaking the Coupling Symmetry

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Communications in Theoretical Physics 2003年第5期39卷 549-554页

作者： LIXiao-wen ZHENGZHi-gang DepartmentofPhysics BeijingNormaluniversityBeijing100875China

Collective unidirectional motion of an asymmetrically coupled array of oscillators in symmetric periodic potentials is studied. A directed current is observed when the drift coupling is presented, while no external biased force is applied. Negative directed current is found when varying system parameters. An addition of a periodic rocking force may enhance the efficiency of directed transport. Resonant steps of the current are found and interpreted as the mode locking between the array and the ac force. Noise-assisted transport is observed, and an optimal noise intensity can give rise to a most efficient transport. The directed transport thus can be optimized and furthermore controlled by suitably adjusting the parameters of the system.

关键词： directional transport mode locking stochastic resonance

Discovery of Fractionalized Neutral Spin-1/2 Excitation of Topological Order

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Chinese Physics Letters 2017年第9期34卷 1-2页

作者： Xiao-gang wen Department of Physics Massachusetts Institute of Technology Cambridge Massachusetts 02139 USA

After the discovery of fraction quantum Hall states in the 1980s, it became more and more clear that Landau symmetry breaking theory does not describe all possible quantum phases of matter. The new quan- tum phases of matter were called topologically ordered phases（for gapped cases） or quantum ordered phases （for gapless cases）, which correspond to pat- terns of many-body entanglement. One may won- der： besides quantum Hall systems, are there other systems that realize the new topological/quantum order？

关键词： Discovery of Fractionalized Neutral Spin-1/2 Excitation of Topological Order

The simultaneous removal of ammonium and manganese from surface water by MeO_x:Side effect of ammonium presence on manganese removal

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Journal of Environmental Sciences 2019年第3期31卷 346-353页

作者： Xuan Tian Ruifeng Zhang Tinglin Huang gang wen Key Laboratory of Northwest Water Resource Environment and Ecology MOE Xi'an University of Architecture and Technology Shaanxi Key Laboratory of Environmental Engineering Xi'an University of Architecture and Technology

Manganese and ammonium pollution in surface water sources has become a serious *** this study, a pilot-scale filtration system was used to investigate the effect of ammonium on manganese removal during the simultaneous removal of ammonium and manganese from surface water using a manganese co-oxide filter film(MeO_x ). The results showed that the manganese removal efficiency of MeO_x in the absence of ammonium was high and stable, and the removal efficiency could reach 70% even at 5.5 °C. When the influent ammonium concentration was lower than 0.7 mg/L, ammonium and manganese could be removed simultaneously. However, at an ammonium concentration of 1.5 mg/L, the manganese removal efficiency of the filter gradually decreased with time(from 96% to 46.20%). Nevertheless, there was no impact of manganese on ammonium removal. The mechanism by which ammonium negatively affected manganese removal was investigated, demonstrating that ammonium affected manganese removal mainly through two possible mechanisms. On one hand, the decreased p H caused by ammonium oxidation was unfavorable for the oxidation of manganese by MeO_x ; on the other hand, the presence of ammonium slowed the growth of new MeO_x and retarded the increase in the specific surface area of the Me Ox-coated sand, and induced changes in the morphology and crystal structure of Me Ox. Consequently, the manganese removal efficiency of the filter decreased when ammonium was present in the inlet water.

关键词： Surface water Manganese Ammonium MeO_x Side effect

Comparisons of the film peeling from the composite oxides of quartz sand filters using ozone, hydrogen peroxide and chlorine dioxide

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Journal of Environmental Sciences 2015年第8期27卷 20-27页

作者： Yingming Guo Tinglin Huang gang wen Xin Cao School of Environmental and Municipal Engineering Xi'an University of Architecture and Technology

To solve the problem of shortened backwashing intervals in groundwater plants, several disinfectants including ozone（O3）, hydrogen peroxide（H2O2） and chlorine dioxide（Cl O2）were examined to peel off the film from the quartz sand surface in four pilot-scale *** optimized oxidant dosage and oxidation time were determined by batch ***, the optimized conditions were tested in the four pilot-scale columns. The results demonstrated that the backwashing intervals increased from 35.17 to 54.33（H2O2）and to 53.67 hr（ClO2） after the oxidation treatments, and the increase of backwashing interval after treatment by O3 was much less than for the other two ***, the treatment efficiency of filters was not affected by O3 or H2O2 oxidation;but after oxidation by ClO2, the treatment efficiency was deteriorated, especially the ammonia removal（from 96.96% to 24.95%）. The filter sands before and after the oxidation were characterized by scanning electron microscopy and X-ray photoelectron *** with the oxidation by O3 and H2O2, the structures on the surface of filter sands were seriously damaged after oxidation by ClO2. The chemical states of manganese on the surfaces of those treated sands were only changed by ClO2. The damage of the structures and the change of the chemical states of manganese might have a negative effect on the ammonia removal. In summary, H2O2 is a suitable agent for film peeling.

关键词： Pilot-scale Ozone Hydrogen peroxide Chlorine dioxide Backwashing interval

Differences in geochemistry and hydrocarbon generation of sourcerock samples dominated by telalginite and lamalginite: A case study on the Permian saline lacustrine source rocks in the Jimusaer Sag, NW China

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Petroleum Science 2023年第1期20卷 141-160页

作者： Shi-Ju Liu gang Gao wen-Zhe gang Bao-Li Xiang Ming Wang College of Geosciences China University of PetroleumNo.18 Fuxue RoadBeijing102249China State Key Laboratory of Petroleum Resource and Prospecting China University of PetroleumNo.18 Fuxue RoadBeijing102249China Experimental Testing Institute PetroChina Xinjiang Oilfield CompanyKaramayXinjiang834000China

The Middle Permian Lucaogou Formation in Northwestern China mainly contains typical saline lacustrine oil *** study the differences in geochemistry and hydrocarbon generation of source-rock samples in Lucaogou Formation in Jimusaer Sag,57 core samples from two boreholes were analyzed herein by performing total organic carbon(TOC)analysis,RockeEval pyrolysis,and gas chromatographicemass spectrometry experiments on saturated *** kinetics of oil generation were studied using two samples comprising typical maceral *** results showed that the hydrocarbons produced by telalginite are relatively rich in pristane(Pr),phytane(Ph),b-carotane,high-carbon normal alkanes,and C29 regular *** produced by lamalginite contain a significantly higher content of C20 tricyclic terpanes(TT),C21TT,C24 tetracyclic terpanes(TeT),C29 norhopane,and C28 regular *** on the pyrolysis and biomarker compound parameters,telalginite has a higher conversion rate for hydrocarbons than lamalginite in the low-mature to mature stage,which is consistent with their kinetic *** source rock displays a much narrower distribution of activation energies than telalginite source *** narrower activation energy distribution effectively narrows the main stage of hydrocarbon *** addition,the activation energy distribution of lamalginite concentrated in the high-value interval,indicating the characteristics of the relatively lagging hydrocarbon generation of lamalginite.

关键词： Maceral component Biomarker compounds Oil generation kinetics Activation energy Lucaogou formation

Phase Synchronization of Coupled Rossler Oscillators： Amplitude Effect

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Communications in Theoretical Physics 2007年第2期47卷 265-269页

作者： LI Xiao-wen ZHENG Zhi-gang Department of Physics and the Beijing-Hong-Kong-Singapore Joint Center for Nonlinear and Complex Systems （Beijing） Beijing Normal University Beijing 100875 China

Phase synchronization of two linearly coupled Rossler oscillators with parameter misfits is explored. It is found that depending on parameter mismatches, the synchronization of phases exhibits different manners. The synchronization regime can be divided into three regimes. For small mismatches, the amplitude-insensitive regime gives the phase-dominant synchronization; When the parameter misfit increases, the amplitudes and phases of oscillators are correlated） and the amplitudes will dominate the synchronous dynamics for very large mismatches. The lag time among phases exhibits a power law when phase synchronization is achieved.

关键词： phase synchronization amplitude eiiect

Undersea safety mining of the large gold deposit in Xinli District of Sanshandao Gold Mine

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International Journal of Minerals,Metallurgy and Materials 2012年第7期19卷 574-583页

作者： Zhi-xiang Liu wen-gang Dang Xian-qun He School of Resources and Safety Engineering Central South University Changsha 410083 China

The exploration of undersea resources becomes popular as land resources decrease. Researches were conducted with emphasis on the safety and efficiency of undersea mining of the large gold deposit in Xinli District of Sanshandao Gold Mine. A series of tests for the physical and mechanical characteristics of rock mass were carried out, and the three-dimensional geo-stress distribution was tested in the mining area. Further, a similar experimental simulation platform, which revealed the mechanism of water inrush and ascertained the reason- able thickness of the safety isolate layer, was established for the undersea mining. Meanwhile, the feasibility of cancelling the ore pillars and the safety conditions was checked by numerical simulation. The simulation results show that it is safe to exploit the ore body below the -85 m level （presently, the exploitation level is below -160 m in Xinli District）, and the ore pillars can be cancelled below the -560 m level. Fur- thermore, a novel backfill method was designed to reduce the rock strata disturbance and settlement, and the settlement of roof strata was monitored during the mining process. Engineering practice shows that the settlement of roof strata was small and that no disaster happened. This indicates that the undersea safety mining technology of the large gold deposit is achieved in Xinli District.

关键词： undersea mining gold deposits rock mechanics mine roof control computer simulation