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| 1 | Analysis on Thermal Environment of Underlying Surface and PM2.5 Concentration in Community Park of Beijing in Winter显示文摘Community park is one of the most important landscape spaces for urban people to live outdoors,and people’s perception of environmental microclimate is a direct factor affecting the use frequency and experience of community parks.In this paper,Shijingshan Sculpture Park of Beijing was taken as experimental object.Using the method of fi eld measurement,9-d winter test for 3 months was conducted in three kinds of landscape architecture spaces,including waterfront plaza,open green space and square under the forest.Via regression analysis method,the measured air temperature(Ta),relative humidity of air(RH),particulate matter(PM2.5)were analyzed.It is found that winter sunshine is main infl uence factor of garden microclimate,and there is a negative correlation between local temperature and humidity;local temperature and humidity can regulate the local PM2.5 concentration,and temperature shows negative correlation with PM2.5 concentration,while humidity shows positive correlation with PM2.5 concentration.Meanwhile,via comparative analysis of temperature,humidity and PM2.5 concentration in different types of garden spaces,the infl uence of different space forms,planting forms and materials on thermal environment of underlying surface and PM2.5 concentration was summarized,and design strategy was optimized,to be as benefi cial reference of reconstruction design of community parks. | PENG Li XU Zhenghou CHEN Heming | 2020 | Journal of Landscape Research2020，12，6： | 3 |
| 2 | Variational solution about over-determined geodetic boundary value problem and its related theories显示文摘A new solving method for Laplace equation with over-determined geodetic boundary conditions is pro- posed in the paper, with the help of minimizing some kinds of quadratic functional in calculus of variation. At first, the so-called variational solution for over-determined geodetic boundary value problem is defined in terms of principles in calculus of variation. Then theoretical properties related with the solution are derived, especially for its existence, uniqueness and optimal approximation. And then the computational method of the solution is discussed, and its expression is exhibited under the case that all boundaries are spheres. Finally an arithmetic example about EGM96 gravity field model is given, and the computational results show that the proposed method can efficiently raise accuracy to deal with gravity data. In all, the variational solution of over-determined geodetic boundary value problem can not only fit to deal with many kinds of gravity data in a united form, but also has strict mathematical basements. | YU JinHai1,2 & PENG FuQing3 1 Institute of Geodesy and Geophysics, Chinese Academy of Sciences, Wuhan 430077, China 2 College of Earth Scienc, Graduate University of Chinese Academy of Sciences, Beijing 100049, China 3 Zhenghou Institute of Surveying and Mapping, Zhengzhou 450052, China | 2007 | Science China Earth Sciences2007，50，4： | 2 |
| 3 | 显示文摘 | Zhu Zhenghou Huang Yuhong Jiang Daguo | 2009 | Journal of Wuhan University of Technology2009，24，1： | 1 |
| 4 | 显示文摘 | Zhu Zhenghou Huang Yuhong Jiang Daguo | 2009 | Journal of Wuhan university of Technology2009，24，1： | 1 |
| 5 | Studies onpiezomagnetic properties of polygonal amorphous pow-ders/ silicone rubber composite films 显示文摘 | Zhou Jia Zhu Zhenghou Li Xiaomin | | Journal of0，，： | 1 |
| 6 | Microstructures and soft magnetic properties of Fe_(73.5)Cu_(1)Nb_(3-x)Si_(13.5)B_(9)Yx(x=0-1.5)alloys显示文摘Based on composition of Finemet alloy,structures and soft magnetic properties of Fe_(73.5)Cu_(1)Nb_(3-x)Si_(13.5)B_(9)Yx(x=0,0.5,1.0,1.5)alloys formed by replacing Nb(niobium)by Y(yttrium)were studied in this paper.The research results show that when x=0 or 0.5,rapidly solidified as-cast alloy is Fe amorphous single-phase structure,and Y atoms are dispersed in matrix;when x=1.0 or 1.5,crystalline phase precipitates.Fe_(73.5)Cu_(1)Nb_(3-x)Si_(13.5)B_(9)Yx(x=0,0.5,1.0,1.5)alloys begin to precipitateα-Fe(Si)solid solution phase after crystallization annealing above 480℃,when x=0.5,grain size is 12.6 nm,which shows that Y can replace Nb in small amount and refine grain size.Fe_(73.5)Cu_(1)Nb_(2.5)Si_(13.5)B_(9)Y_(0.5)alloy has excellent soft magnetic properties:μm value is 813.1×10^(3),which is 36%higher than that of Finemet alloy;μi value is 154.6×10^(3),close to that of Finemet alloy,and BS and Hc values are 1.24 T and 0.56 A/m,respectively,better than those of Finemet alloy.In addition,Fe_(73.5)Cu_(1)Nb_(2.5)Si_(13.5)B_(9)Y_(0.5)alloy has excellent soft magnetic properties at high temperature,μe value only reduces by 8.8%at 1 kHz with ambient temperature increased from 30 to150℃,andμe value is 128.02×10^(3)in 150℃,which is 15.74%higher than that of Finemet alloy. | Yuchen Mao Zhenghou Zhu Hui Zhao | 2021 | Journal of Rare Earths2021，39，11： | 1 |
| 7 | Morphological,electromagnetic and absorbing properties of GR/Fe_(93.5)Si_(3.5)La_(1)Ce_(2) composite powders显示文摘In this study,the morphological,electromagnetic and absorbing properties of GR/Fe_(93.5)Si_(3.5)La_(1)Ce_(2) composite powders were systematically investigated.The composite powders was prepared by highenergy ball milling.X-ray diffractometer(XRD) and Raman spectroscopy analyses confirm the presence of α-Fe and graphene in the composite powders.Scanning electron microscopy(SEM) observation shows that the composite powders have a flake morphology.The electromagnetic and absorbing properties of the composite powders were analyzed with a vector network analyzer.When the milling time and graphene content are 12 h and 1 wt%,respectively,the composite powders exhibit the best absorbing property.For 1.0 wt% GR/Fe_(93.5)Si_(3.5)La_(1)Ce_(2) composite at 0.3 GHz,the ε’and ε' are 77.76 and124.73,and the μ’and μ' are 6.09 and 2.83.Its tanδ_(ε),tanδ_(μ) and tanδ reach 0.63,13.80 and 14.43,respectively,which basically increased the tanδ by more than 2 times compared with other composite powders.This indicates that the composite powder has excellent wave absorption performance.Meanwhile,the analysis shows that the loss mechanism of the composite powder is mainly relaxation loss,conduction loss,eddy current loss and natural resonance.Therefore,this composite powder provides a new approach for the development of wave absorbing materials. | Wei Zhou Chaochao Zeng Zhenghou Zhu | 2023 | Journal of Rare Earths2023，41，1： | 0 |
| 8 | Pressure stress-impedance effect in FeCuNbSiB amorphours ribbons显示文摘The stress-impedance effect in Fe73.5Cu1Nb3Si13.5B9 (at%) ribbons is measured to investigate the influences of vacuum annealing and pressure stress. The results can be explained by the influence of induced anisotropy in the magnetization processes at the chosen drive current frequency of 90 MHz. The maximum SI% value of the ribbon annealed at 300 ℃ is 2.52%. | MA GuangBin ZHU ZhengHou XIA XiaoGe LI TangHua | 2009 | Science China(Technological Sciences)2009，52，8： | 0 |
| 9 | Co-localization of histamine and norepinephrine in sympathetic ganglia and exocytosis of endogenous histamine from cardiac sympathetic nerve endings of macaca mulatto monkey显示文摘AIM To provide the evidence about localization, biosynthesis, metabolism and release of histamine from the cardiac sympathetic nerve terminals, and endogenous sympathetic histamine could inhibit itsel frelease from the nerve terminal through the presynaptic histamine H3 receptor. METHODS Using double-labeled immunohistochemistry to observe the co-localization of histamine and NE in the superior cer-vical ganglia (SCG) of macaca mulatto monkey; Different-speed centrifugation to obtain the cardiac sympathetic nerve terminal model (the cardiac synaptosomes), spectrofluorometer and ELISA techniques to detect the release of histamine from the cardiacsynaptosomes. RESULTS ( 1 ) The coexistence of histamine and norepinephrine immunoreactivities was identified in the same neuron within SCG of macaca mulatto monkey. (2) Depolarization of macaca mulatto monkey cardiac synaptosomes with 50 mmol/L potassium caused the release of endogenous histamine, | Ming-kaiLI Xiao-xingLUO Liang-weiCHEN ZhongCHEN JiaMENG JingHU Yu-meiWU Jing-ruMENG ZhengHOU XueMA | 2005 | 中国药理通讯2005，22，2： | 0 |
| 10 | Climatic and Environmental Characteristics of Beijing Based on Rapid Processing Technology of Urban Meteorological Big Data显示文摘The meteorological big data in Beijing area are typical multi-dimensional big data containing spatiotemporal characteristics,which have important research value for researches related to urban human settlement environment.With the help of computer programming and software processing,big data crawling,integration,extraction and multi-dimensional information fusion can be realized quickly and effectively,so as to obtain the data set needed for research and realize the target of visualization.Through big data analysis of wind environment,thermal environment and total atmospheric suspended particulate pollutants in Beijing area,it was found that the average wind speed in Beijing area decreased signifi cantly in recent 40 years,while the surface temperature increased signifi cantly;urban heat island effect was signifi cant,and the phenomenon of atmospheric suspended particulate pollution was relatively common.The spatial distribution of the three climatic and environmental data was not balanced and had signifi cant regularity and correlation.Improving urban ventilation corridors and improving urban ventilation capacity is a feasible way to improve urban heat island effect and reduce urban climate issues such as atmospheric particulate pollution. | PENG Li CHEN Heming XU Zhenghou | 2021 | Journal of Landscape Research2021，13，1： | 0 |
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