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Natural orbitals renormalization group approach to a Kondo singlet

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Science China(Physics,Mechanics & Astronomy) 2020年第9期63卷 89-98页

作者： ru zheng RongQiang He ZhongYi Lu Department of Physics Renmin University of ChinaBeijing 100872China

A magnetic impurity embedded in a Fermi sea is collectively screened by a cloud of conduction electrons to form a Kondo singlet below a characteristic energy scale TK,the Kondo temperature,through the mechanism of the Kondo *** have reinvestigated the Kondo singlet by means of the newly developed natural orbitals renormalization group(NORG)*** find that,in the framework of natural orbitals formalism,the Kondo screening mechanism becomes transparent and simple,while the intrinsic structure of a Kondo singlet is clearly *** a single impurity Kondo system in whichever case of either finite size or thermodynamic limit,there exists a single active natural orbital that screens the magnetic impurity *** the perspective of entanglement,the magnetic impurity is entangled dominantly with the active natural orbital,i.e.,the subsystem formed by the active natural orbital and the magnetic impurity basically disentangles from the remaining *** have also studied the structures of the active natural orbital respectively projected into real space and momentum ***,the dynamical properties,represented by one-particle Green’s functions defined at the active natural orbital,are obtained by the correction vector ***,the well-known Kondo resonance is clearly observed in the spectral function at the active natural *** realize the thermodynamic limit,the Wilson chains with the numerical renormalization group approach are employed.

关键词： Kondo effect Kondo singlet natural orbitals renormalization group active natural orbital

Research progress and prospect of low-carbon biological technology for nitrate removal in wastewater treatment

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Frontiers of Environmental Science & Engineering 2024年第7期18卷 1-21页

作者： ru zheng Kuo Zhang Lingrui Kong Sitong Liu College of Environmental Sciences and Engineering Peking UniversityBeijing 100871China Key Laboratory of Water and Sediment Sciences Ministry of Education of ChinaBeijing 100871China Eco-Environment and Resource Efficiency Research Laboratory School of Environment and EnergyPeking University Shenzhen Graduate SchoolShenzhen 518055China

Wastewater treatment plants are the major energy consumers and significant sources of greenhouse gas emissions,among which biological nitrogen removal of wastewater is an important contributor to carbon ***,traditional heterotrophic denitrification still has the problems of excessive residual sludge and the requirement of external carbon ***,the development of innovative low-carbon nitrate removal technologies is *** review outlines the key roles of sulfur autotrophic denitrification and hydrogen autotrophic denitrification in low-carbon wastewater *** discovered nitrate/nitrite dependent anaerobic methane oxidation enables sustainable methane emission reduction and nitrogen removal by utilizing available methane in *** microorganisms exhibited a promising potential to achieve carbon-negative nitrate ***,the algal-bacterial symbiosis system and photogranules offer effective and prospective low-carbon options for nitrogen ***,the emerging nitrate removal technology of photoelectrotrophic denitrification and the underlying,photoelectron transfer mechanisms are ***,we summarize and prospect these technologies,highlighting that solar-driven biological nitrogen removal technology is a promising area for future sustainable wastewater *** review has important guiding significance for the design of low-carbon wastewater treatment systems.

关键词： Carbon emissions Low-carbon Biological nitrogen removal Denitrification

Hot Deformation Behavior of P92 Steel Used for Ultra-Super-Critical Power Plants

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Journal of Iron and Steel Research International 2011年第7期18卷 53-58页

作者： SHI ru-xing LIU zheng-dong Institute for Structural Materials Central Iron and Steel Research Institute Beijing 100081 China

Hot compression tests of P92 steel at temperatures in the range of 1 173 to 1 523 K and at strain rates in the range of 0.1 to 10 s^-1 were carried out on a Gleeble-3500 thermal-mechanical simulator, and the corresponding flow curves were measured. The results showed that the flow stress and the peak strain increase with decreasing deformation temperature and increasing strain rate. The critical Z value, below which the complete dynamic reerystallization may occur, was determined to have 4.61 × 10^18. The hot deformation activation energy of the steel was about 437 kJ/mol. The hot deformation equation and the microstructure diagram of P92 steel were obtained. For the convenience of the practical application, the empirical equation for the peak stress can be described as σp=17. 17lnε＋902499/T-524.1.

关键词： P92 steel dynamic recovery recrystallizationl flow stressl Zener-Hollomon parameter

Fe_(2)O_(3)/TiO_(2)/reduced graphene oxide-driven recycled visible-photocatalytic Fenton reactions to mineralize organic pollutants in a wide pH range

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Journal of Environmental Sciences 2023年第12期134卷 11-20页

作者： ru zheng Dehong Yang Yao Chen Zhenfeng Bian Hexing Li Ministry of Education Key Laboratory of Resource Chemistry and Shanghai Key Laboratory of Rare Earth Functional Materials Shanghai Normal UniversityShanghai 200234China

Photocatalytic Fenton reactions combined the advantages from both photocatalysis and Fenton reaction in mineralizing organic pollutants. The key problems are the efficiency and recycling stability. Herein, we reported a novel Fe_(2)O_(3)/TiO_(2)/reduced graphene oxide(FTG) nanocomposite synthesized by a facile solvothermal method. The TiO_(2)in FTG degraded organic pollutants and mineralized intermediates via photocatalysis under visible light irradiation, which could also promote Fenton reaction by accelerating Fe^(3+)-Fe^(2+)recycle. Meanwhile, the Fe_(2)O_(3)rapidly degraded organic pollutants via Fenton reactions, which also promoted photocatalysis by enhancing visible light absorbance and diminishing photoelectronhole recombination. The high distribution of TiO_(2)and Fe_(2)O_(3)on rGO, together with their strong interaction resulted in enhanced synergetic cooperation between photocatalysis and Fenton reactions, leading to the high mineralization efficiency of organic pollutants. More importantly, it could also inhibit the leaching of Fe species, leading to the long lifetime of FTG during photocatalytic Fenton reactions in a wide pH range from 3.4 to 9.2.

关键词： Fe_(2)O_(3)/TiO_(2)/rGO nanocomposite(FTG) Visible-photocatalytic Fenton reactions Synergetic effect Pollutant mineralization Strong durability in a wide pH range

Chlorocholine chloride and paclobutrazol treatments promote carbohydrate accumulation in bulbs of Lilium Oriental hybrids 'Sorbonne'

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2012年第2期13卷 136-144页

作者： Ri-ru zheng Yun WU Yi-ping XIA Department of Horticulture College of Agriculture and BiotechnologyZhejiang UniversityHangzhou 310029China College of Horticulture and Forestry Sciences Huazhong Agricultural UniversityWuhan 430070China

The present study was to test the hypothesis that the plant growth retardants chlorocholine chloride(CCC) and paclobutrazol(PBZ)could improve the carbohydrate accumulation in lily bulbs by enhancing photosynthetic capacity and changing endogenous *** of Lilium Oriental hybrids'Sorbonne'were treated with a foliar spray of CCC or PBZ(both at 300 mg/L)solution,at six weeks after planting(6 WAP).The morphological parameters,endogenous hormone contents(gibberellic acid(GA),abscisic acid(ABA),and indole-3-acetic acid(IAA)),and carbohydrate contents were measured from 6 to 18 WAP,at 2-week *** results showed that CCC increased the biomass of leaves and stems which might produce more photoassimilates available for transportation and ***,PBZ treatment suppressed vegetative growth and favored photoassimilate transportation into bulbs.A slight delay of bud and anthesis formation was observed in both treated *** and PBZ treatments substantially enhanced the sucrose contents in leaves probably due to the increase of chlorophyll *** with CCC or PBZ decreased GA but increased IAA contents in lily bulbs which might stimulate starch accumulation and formation of new *** experiment suggested that CCC or PBZ treatment is an effective method to promote carbohydrate accumulation in lily bulbs.

关键词： Carbohydrate Chlorocholine chloride Gibberellic acid Lilium Oriental hybrids 'Sorbonne' Paclobutrazol

Adrenomedullin: an important participant in neurological diseases

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Neural Regeneration Research 2020年第7期15卷 1199-1207页

作者： Feng-Jiao Li Si-ru zheng Dong-Mei Wang College of Life Sciences Laboratory of Neuroendocrinology Provincial Key Laboratory of Developmental Biology and Neuroscience Fujian Normal University

Adrenomedullin,a peptide with multiple physiological functions in nervous system injury and disease,has aroused the interest of *** review summarizes the role of adrenomedullin in neuropathological disorders,including pathological pain,brain injury and nerve regeneration,and their *** a newly characterized pronociceptive mediator,adrenomedullin has been shown to act as an upstream factor in the transmission of noxious information for various types of pathological pain including acute and chronic inflammatory pain,cancer pain,neuropathic pain induced by spinal nerve injury and diabetic *** of glia-neuron signaling networks in the peripheral and central nervous system by adrenomedullin is involved in the formation and maintenance of morphine *** has been shown to exert a facilitated or neuroprotective effect against brain injury including hemorrhagic or ischemic stroke and traumatic brain ***,adrenomedullin can serve as a regulator to promote nerve regeneration in pathological ***,adrenomedullin is an important participant in nervous system diseases.

关键词： adrenomedullin brain injury glia mechanism morphine tolerance neural regeneration neuroprotective effect pathological pain regeneration sensitization target

An Anderson Impurity Interacting with the Helical Edge States in a Quantum Spin Hall Insulator

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Chinese Physics Letters 2018年第6期35卷 70-74页

作者： ru zheng Rong-Qiang He Zhong-Yi Lu Department of Physics Renmin University of China

Using the natural orbitals renormalization group（NORG）method,we investigate the screening of the local spin of an Anderson impurity interacting with the helical edge states in a quantum spin Hall *** is found that there is a local spin formed at the impurity site and the local spin is completel.y screened by electrons in the quantum spin Hall ***,the local spin is screened dominantly by a single active natural *** then show that the Kondo screening mechanism becomes transparent and simple in the framework of the natural orbitals *** project the active natural orbital respectively into real space and momentum space to characterize its *** conilrm the spin-momentum locking property of the edge states based on the occupancy of a Bloch state on the edge to which the impurity ***,we study the dynamical property of the active natural orbital represented by the local density of states,from which we observe the Kondo resonance peak.

关键词： An Anderson Impurity Interacting with the Helical Edge States in a Quantum Spin Hall Insulator

Estimation of OCDD degradation rate in soil

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Journal of Environmental Sciences 2005年第6期17卷 981-983页

作者： ZHAO Xing-ru zheng Ming-hui ZHANG Bing QIAN Yong XU Xiao-bai State Key Laboratory of Environmental Chemistry and Ecotoxicology Research Center for Eco-Environmental Sciences Chinese Academy of ScienceBeijing 100085 China

The current concentrations of polychlorinated dibenzo-p-dioxins and dibenzofurans （PCDD/Fs） were determined in soils contaminated with Chinese technical product sodium pentachlorophenate （ Na- PCP）. The estimated half-life of octachlorodioxin （OCDD） was about 14 years in contaminated soils based on the local historical record and mass balance calculation during the past 43 years（ 1960-2003）. The isomer profiles remained the same regardless of paddy field soil or riverbank soil. The results indicated that the congenerspecific information was efficient in estimating the PCDD/Fs fate in contaminated soils.

关键词： OCDD degradation rate Na-PCP

PTEN knockdown with the Y444F mutant AAV2 vector promotes axonal regeneration in the adult optic nerve

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Neural Regeneration Research 2018年第1期13卷 135-144页

作者： zheng-ru Huang Hai-ying Chen Zi-zhong Hu Ping Xie Qing-huai Liu Department of Ophthalmology the First Affiliated Hospital of Nanjing Medical University Nanjing Jiangsu Province China Department of Ophthalmology the Second People's Hospital of Changshu Changshu Jiangsu Province China

The lack of axonal regeneration is the major cause of vision loss after optic nerve injury in adult mammals. Activating the PI3K/AKT/mTOR signaling pathway has been shown to enhance the intrinsic growth capacity of neurons and to facilitate axonal regeneration in the central nervous system after injury. The deletion of the mTOR negative regulator phosphatase and tensin homolog （PTEN） enhances regeneration of adult corticospinal neurons and ganglion cells. In the present study, we used a tyrosine-mutated （Y444F） AAV2 vector to efficiently express a short hairpin RNA （shRNA） for silencing PTEN expression in retinal ganglion cells. We evaluated cell survival and axonal regeneration in a rat model of optic nerve axotomy. The rats received an intravitreal injection of wildtype AAV2 or Y444F mutant AAV2 （both carrying shRNA to PTEN） 4 weeks before optic nerve axotomy. Compared with the wildtype AAV2 vector, the Y444F mutant AAV2 vector enhanced retinal ganglia cell survival and stimulated axonal regeneration to a greater extent 6 weeks after axotomy. Moreover,post-axotomy injection of the Y444F AAV2 vector expressing the shRNA to PTEN rescued ～19% of retinal ganglion cells and induced axons to regenerate near to the optic chiasm. Taken together, our results demonstrate that PTEN knockdown with the Y444F AAV2 vector promotes retinal ganglion cell survival and stimulates long-distance axonal regeneration after optic nerve axotomy. Therefore, the Y444F AAV2 vector might be a promising gene therapy tool for treating optic nerve injury.

关键词： nerve regeneration optic nerve axotomy gene therapy Müller cell retinal ganglion cell AAV2 shRNA PTEN GLAST mTOR neural regeneration