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The Relationship between Working Conditions and Adverse Health Symptoms of Employee in Solar Greenhouse

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Biomedical and Environmental Sciences 2015年第2期28卷 143-147页

作者： ZHANG min WANG Xiu feng CUI Xiu min WANG jian YU Shi Xin College of Resources and Environment Shandong Agricultural University College of the Horticulture Science and Engineering Shandong Agricultural University

To determine the correlation between the working environment and the health status of employees in solar greenhouse, 1171 employees were surveyed. The results show the ＇Greenhouse diseases＇ are affected by many factors. Among general uncomforts, the morbidity of the bone and joint damage is the highest and closely related to labor time and age. Planting summer squash and wax gourd more easilv cause skin pruritus.

关键词： The Relationship between Working Conditions and Adverse Health Symptoms of Employee in Solar Greenhouse

A fluorescent probe for fluoride ion based on 2-aminopyridyl-bridged calix[6]arene

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Chinese Chemical Letters 2009年第10期20卷 1191-1194页

作者： jian Hang Mai Jun min Liu Shao Yong Li Huan feng jiang School of Chemistry and Chemical Engineering of Sun Yat-Sen University Guangzhou 510275 China College of Chemistry South China University of Technology Guangzhou 510640 China College of Pharraacy Tianjin Medical University Tianjin 300070 China

An 2-anfinopyddyl-bddged calix[6]arene on the upper rim fixed in cone conformation （3） was successfully synthesized and its highly selective recognition towards fluoride ion was proved by fluorescent and 1H NMR titr... 详细信息

关键词： Calixarene Fluorescent chemosensor Fluoride ion

Breeding against mycorrhizal symbiosis:Modern cotton (Gossypium hirsutum L.) varieties perform more poorly than older varieties except at very high phosphorus supply levels

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Journal of Integrative Agriculture 2023年第3期22卷 701-715页

作者： WANG Xin-xin ZHANG min SHENG jian-dong feng Gu Thomas W.KUYPER College of Resources and Environmental Sciences China Agricultural UniversityBeijing 100193P.R.China State Key Laboratory of North China Crop Improvement and Regulation/Mountain Area Research Institute Hebei Agricultural UniversityBaoding 071001P.R.China College of Resource and Environmental Sciences Xinjiang Agricultural UniversityUrumqi 830052P.R.China Soil Biology Group Wageningen University&ResearchWageningen 6700AAThe Netherlands

Cotton (Gossypium hirsutum L.) is an importantfiber cash crop,but its root traits related to phosphorus (P) acquisition,including mycorrhizal root traits,are poorly *** cotton varieties bred in northwestern China that were released between 1950 and 2013 were grown in pots with or without one arbuscular mycorrhizal fungal (AMF) species(Funneliformis mosseae) at three P supply levels (0,50 and 300 mg P as KH_(2)PO_(4)kg^(-1)).Eleven root traits were measured and calculated after 7 wk of *** more recent accessions had smaller root diameters,acquired less P and produced less biomass,indicating an (inadvertent) varietal selection for thinner roots that provided less cortical space for AMF,which then increased the need for a high P fertilizer *** the two lower P levels,the mycorrhizal plants acquired more P and produced more biomass than non-mycorrhizal plants (3.2 vs.0.9 mg P per plant;1.8 vs.0.9 g biomass per plant at P_(0);14.5 vs.1.7 mg P per plant;and 4.7 vs.1.6 g biomass per plant at P_(50)).At the highest P level,the mycorrhizal plants acquired more P than non-mycorrhizal plants (18.8 vs.13.4 mg per P plant),but there was no difference in biomass (6.2 vs.6.3 g per plant).At the intermediate P level,root diameter was significantly positively correlated with shoot biomass,P concentration and the P content of mycorrhizal *** results of our study support the importance of the outsourcing model of P acquisition in the root economics space *** varietal selection in the last decades,resulting in thinner roots and a lower benefit from AMF,has led to a lower productivity of cotton varieties at moderate P supply (i.e.,when mycorrhizal,the average biomass of older varieties 5.0 g per plant *** of newer varieties 4.4 g per plant),indicating the need to rethink cotton breeding efforts in order to achieve high yields without very high P *** feasible way to solve the problem of inadvertent varietal selection for cotto

关键词： cotton varieties plant breeding arbuscular mycorrhizal fungi root economics space outsourcing phosphorus acquisition

PARAMETRIC IDENTIFICATION AND SENSITIVITY ANALYSIS FOR AUTONOMOUS UNDERWATER VEHICLES IN DIVING PLANE

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Journal of Hydrodynamics 2012年第5期24卷 744-751页

作者： XU feng ZOU Zao-jian YIN jian-chuan CAO jian School of Naval Architecture Ocean and Civil Engineering Shanghai Jiao Tong University Shanghai 200240China School of Naval Architecture Ocean and Civil Engineering and State Key Laboratory of Ocean EngineeringShanghai Jiao Tong University Shanghai 200240 China College of Shipbuilding Engineering Harbin Engineering University Harbin 150001 China

The inherent strongly nonlinear and coupling performance of the Autonomous Underwater Vehicles （AUV）, maneuvering motion in the diving plane determines its difficulty in parametric identification. The motion parameters in diving plane are obtained by executing the Zigzag-like motion based on a mathematical model of maneuvering motion. A separate identification method is put forward for parametric identification by investigating the motion equations. Support vector machine is proposed to estimate the hydrodynamic derivatives by analyzing the data of surge, heave and pitch motions. Compared with the standard coefficients, the identified parameters show the validation of the proposed identification method. Sensitivity analysis based on numerical simulation demonstrates that poor sensitive derivative gives bad estimation results. Finally the motion simulation is implemented based on the dominant sensitive derivatives to verify the reconstructed model.

关键词： parametric identification Autonomous Underwater Vehicles (AUVs) support vector machine sensitivity analysis

Petrogenesis, Tectonic Evolution and Geothermal Implications of Mesozoic Granites in the Huangshadong Geothermal Field, South China

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Journal of Earth Science 2020年第1期31卷 141-158页

作者： Zhicai Xiao Shuai Wang Shihua Qi jian Kuang min Zhang feng Tian Yongjie Han State Key Laboratory of Biogeology and Environmental Geology China University of GeosciencesWuhan 430074China School of Environmental Studies China University of GeosciencesWuhan 430074China No.935 Geological Brigade Geology Bureau for Nonferrous Metals of Guangdong ProvinceHuizhou 516000China

Mesozoic multi-stage tectono-magmatic events produced widely distributed granitoids in the South China Block. Huangshadong(HSD) is located in south-eastern South China Block, where closely spaced hot springs accompany outcrops of Mesozoic granites. New data on whole-rock geochemistry, zircon U-Pb geochronology, and zircon Lu-Hf isotopes are presented, to study the petrogenesis and tectonic evolution of the granites, and to explore the relationship between granites and geothermal anomalies. Zircon U-Pb isotopes display three periods of granites in the HSD area: Indosinian(ca. 253 Ma, G4) muscovite-bearing monzonitic granite, early Yanshanian(ca. 175–155 Ma, G5 and G3) monzonitic granite and granodiorite, and late Yanshanian(ca. 140 Ma, G1 and G2) biotite monzonitic granite. In petrogenetic type, granites of the three periods are I-type granite. Among them, G1, G2, G3, and G4 are characterized by high fractionation, with high values of SiO2, alkalis, Ga/Al, and Rb/Sr, and depletion in Sr, Ba, Zr, Nb, Ti, REEs, with low(La/Yb)N, Nb/Ta, and Zr/Hf ratios and negative Eu anomalies. In terms of tectonic setting, 253 Ma G4 may be the product of partial melting of the ancient lower crust under post-orogenic extensional tectonics, as the closure of the Paleo-Tethys Ocean resulted in an intracontinental orogeny. At 175 Ma, the subduction of the Pacific Plate became the dominant tectonic system, and low-angle subduction of the Paleo-Pacific Plate facilitated partial melting of the subducted oceanic crust and basement to generate the hornblende-bearing I-type granodiorite. As the dip angle of the subducting plate increased, the continental arc tectonic setting was transformed to back-arc extension, inducing intense partial melting of the lower crust at ca. 158 Ma and resulting in the most frequent granitic magmatic activity in the South China hinterland. When slab foundering occurred at ca. 140 Ma, underplating of mantle-derived magmas caused melting of the continental crust, ge

关键词： radioactive heat Yanshanian granites highly fractionated geothermal genesis tectonic evolution

Natural products are the treasure pool for antimalarial agents

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National Science Review 2022年第11期9卷 11-13页

作者： Bin Zhou jian-min Yue State Key Laboratory of Drug Research Shanghai Institute of Materia Medica Chinese Academy of Sciences

The history of mankind is a constant struggle against diseases, and humans have learned to use natural sources as the remedies to alleviate and/or treat diseases since prehistoric times.e structural diversity and complexity of molecules originated from natural sources are far beyond the scope of human creativity and imagination.

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Large post-liquefaction deformation of sand:Mechanisms and modeling considering water absorption in shearing and seismic wave conditions

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Underground Space 2024年第5期18卷 3-64页

作者： jian-min Zhang Rui Wang Department of Hydraulic Engineering State Key Laboratory of Hydroscience and EngineeringTsinghua UniversityBeijing 100084China

Large deformation of sand due to soil liquefaction is a major cause for seismic *** this study,the mechanisms and modeling of large post-liquefaction deformation of sand considering the significant influence of water absorption in shearing and seismic wave *** of case histories from past earthquakes and review of existing studies highlight the importance of the two *** on the micro and macro scale mechanisms for post-liquefaction shear deformation,the mechanism for water absorption in shearing after initial liquefaction is *** is aided by novel designed constant water-absorption-rate shear *** absorption in shearing can be classified into three types,including partial water absorption,complete water absorption,and compulsory water *** the influence of water absorption in shearing,even a strongly dilative sand under naturally drained conditions could experience instability and large shear *** mechanism for amplification of post-liquefaction deformation under surface wave load is also explained via element tests and theoretical *** shows that surface wave–shear wave coupling can induce asymmetrical force and resistance in sand,resulting in asymmetrical accumulation of deformation,which is amplified by liquefaction.A constitutive model,referred to as CycLiq,is formulated to capture the large deformation of sand considering water absorption in shearing and seismic wave conditions,along with its numerical implementation *** model is comprehensively calibrated based on various types of element tests and validated against centrifuge shaking table tests in the liquefaction experiments and analysis projects(LEAP).The model,along with various numerical analysis methods,is adopted in the successful simulation of water absorption in shearing and Rayleigh wave-shear wave coupling induced large liquefaction ***,the model is applied to high-performance simulation fo

关键词： Liquefaction Sand Large deformation Water absorption in shearing Surface wave Rayleigh wave-shear wave coupling

Multiplet-Splitting of the Quasi-Atomic-Like Core-Valence-Valence Auger Spectra of Zinc Metal

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Chinese Physics Letters 2001年第10期18卷 1415-1417页

作者： YUAN jian-min Department of Applied Physics National University of Defense TechnologyChangsha 410073

Multiplet-splitting of the quasi-atomic-like core-valence-valence (CVV) Auger spectra of zinc metal is calculated by explicitly considering the so-called hole-hole interaction in the final valence states of the Auger transition. We assume that before the Auger transition occurs, the occupied valence states relax to screen the core-hole which results in a redistribution of the valence electrons, in particular within the atom that contains a hole in the core. The supercell method is used to calculate the electronic states concerned by the Auger transition, which is accomplished by the self-consistent full-potential linearized augmented plane wave method. In each supercell, one atom is considered to have a core-hole and many others without it. Due to relaxation and screening, the valence states at the site of the Auger transition are more localized compared with those in the ground-state metal. The multiplet peaks of the quasi-atomic-like CVV Auger spectra of zinc metal are obtained by calculating the Auger transition matrix elements between the referred states.

关键词： transition. method. valence

The composite X-ray spectra of radio-loud and radio-quiet SDSS quasars

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Research in Astronomy and Astrophysics 2021年第1期21卷 33-44页

作者： min-Hua Zhou min-feng Gu Key Laboratory for Research in Galaxies and Cosmology Shanghai Astronomical ObservatoryChinese Academy ofSciences80 Nandan RoadShanghai 200030China University of Chinese Academy of Sciences 19A Yuquan RoadBeijing 100049China

We present a study of the X-ray emission for a sample of radio-detected quasars constructed from the cross-matches between SDSS,FIRST catalogs and XMM-Newton archives.A sample of radio-quiet SDSS quasars without FIRST radio detection is also assembled for *** construct the optical and X-ray composite spectra normalized at rest frame 4215 A(or 2200 A)for both radio-loud quasars(RLQs)and radio-quiet quasars(RQQs)at z≤3.2,with matched X-ray completeness of 19%,redshift and optical *** the optical composite spectrum of RLQs is similar to that of RQQs,we find that RLQs have a higher X-ray composite spectrum than RQQs,consistent with previous studies in the *** dividing the radio-detected quasars into radio loudness bins,we find the X-ray composite spectra are generally higher with increasing radio ***,a significant correlation is found between the optical-to-X-ray spectral index and radio loudness,and there is a unified multi-correlation between the radio and X-ray luminosities and radio loudness in radio-detected *** results could be possibly explained with the corona-jet model,in which the corona and jet are directly related.

关键词： methods:statistical catalogs quasars:general X-rays:general