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Search Results: 1 - 10 of 136102 matches for " Hui-Min Zhang "
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China Precambrian Paleomagnetic Data List
中国前寒武纪古地磁数据表

ZHANG Hui-min,
张惠民

地球学报 , 1995,
Abstract:
Remediation of the Contaminated Soils by Washing with an Aqueous Cysteamine Lixiviant  [PDF]
Hui-Min Liu, Yang Yan, Dai-Jie Shao, De-Liang Li, Yun-Liang Zhang
Journal of Materials Science and Chemical Engineering (MSCE) , 2015, DOI: 10.4236/msce.2015.32001
Abstract: In order to decrease the content of heavy metals in the crops soils, a novel method based on using an aqueous solution bearing cysteamine as the key ingredient was studied to extract the polluted heavy metals including Cd, Cu, Zn, Ni and Pb. By using the single-factor method, remediation-related technical index were screened and they are, respectively, applied to the solid material whereby the heavy metals are released and extracted from the solid material. The biomass solution residues remaining in the solid material after the heavy metal extraction procedure is rapidly biodegradable, so that no objectionable traces remain in the solid materials or soils.
Induced Gauge Structure of Quantum Mechanics on $S^D$
Minoru Hirayama,Hui-Min Zhang,Takeshi Hamada
Physics , 1996, DOI: 10.1143/PTP.97.679
Abstract: The Ohnuki-Kitakado (O-K) scheme of quantum mechanics on $S^D$ embedded in $R^{D+1}$ is investigated. Generators satisfying the O-K algebra are written down explicitly in term of the induced gauge potential. A direct method is developed to obtain the generators in covariant form. It is seen that there exists an induced gauge configuration which is trivial on $S^D$ but might cause a nontrivial physical effect in $R^{D+1}$. The relation of the O-K scheme to extended objects such as the 't Hooft-Polyakov monopole is discussed.
Preparation and Thermal Sensitive Characteristics of the Co0.8Mn0.8Ni0.9Fe0.5O4 Nanometer Powders
ZHANG Dong-Yan,ZHANG Hui-Min,JIN Xian-Jing,CHANG Ai-Min
无机材料学报 , 2009, DOI: 10.3724/sp.j.1077.2009.01008
Abstract: Nano-powders of Co0.8Mn0.8Ni0.9Fe0.5O4 NTC (Negative Temperature Coefficient) thermistor materials were prepared by co-precipitation method with NH4HCO3 as precipitator. The effects of calcination temperature on the material phase were studied. The influences of different sintering processes on the microstructure and thermal sensitive characteristics of NTC thermistor materials were investigated. The samples were characterized by XRD, TG/DTA, FT-IR, SEM, and Laser Particle Size Analyzer. The results show that the powders calcined at 750 re single spinel, the grain size of the powders is about 32.1nm, and the particle size is about 50-100nm. The samples possess better electrical properties: | SUB>25 亯SUB>=1183| ¤cm, B25/50=3034K under the process conditions of constant temperature 840 nd 1200 or 2h respectively, the heating and cooling rate of 1 in. It is found that proper sintering process can effectively improve the microstructure and thermal sensitive properties of the NTC thermistor materials. According to the calculation from the slope of ln| 1/T curves, the activation energy is about 0.26eV.
Preparation and Microwave Sinterability of Mn0.43Ni0.9CuFe0.67O4 NTC Thermistor Materials by Pechini Method
JIN Xian-Jing,CHANG Ai-Min,ZHANG Hui-Min,ZHANG Dong-Yan
无机材料学报 , 2009, DOI: 10.3724/sp.j.1077.2009.01013
Abstract: In order to obtain the NTC thermistors with small B constant (about 1900K), applied to wide temperature range, Mn0.43Ni0.9CuFe0.67O4 NTC thermistor materials prepared by Pechini method were microwave-calcined at different temperatures (650 750 nd 850 The calcined Mn0.43Ni0.9CuFe0.67O4 powders were pressed and then sintered at 1000 n a microwave furnace (multimode cavity, 2.45GHz).The crystal structure, phase compositions, morphology and particle size distribution of the samples were analyzed by FT-IR, X-ray diffraction (XRD), scanning electron microscope (SEM) and a laser particle size analyzer. The experimental results show that the electrical properties of the ceramics are strongly dependent on the calcination and sintering process. The application of microwave leads to a lower calcination temperature (650 and densified uniform microstructures. Microwave sintering can obtain the components with well uniformity of B constant and resistivity, of which the Bavg. is 1930K (deviation of 0.31%) and resistivity | SUB>avg. is 135| ¤cm (deviation of 4.55%). However, the Bavg. is 1720K (deviation of 1.47%) and resistivity |Сvg. is 78| ¤cm (deviation of 25.34%) for the conventionally sintered components. From complex impedance analysis, the grain resistance (Rb) and grain boundary resistance (Rgb) are respectively 255| and 305| for the microwavea2sintered samples. The Rb and Rgb are respectively 200| and 230| for conventionally sintered samples.
Fast outdoor image segmentation algorithm based on Mean-Shift
基于均值偏移的户外图像快速分割算法

YANG Xiao,LU Hui-min,ZHANG Hui,
杨晓
,卢惠民,张辉

计算机应用研究 , 2012,
Abstract: This paper presented an improved fast outdoor color image segmentation algorithm based on Mean-Shift,which could satisfy the real-time requirement of the image processing for the visual navigation of mobile robots in outdoor environments.It introduced the basic theory of Mean-Shift algorithm firstly,and then processed fast color image segmentation algorithm:used a scale transformation to the original image,then segmented the transformed image by the Mean-Shift algorithm in the chosen color space.The experiment results on the outdoor color images show that good segmentation results can be achieved by the proposed algorithm.
Spatial heterogeneity in accumulation and loss potential of soil phosphorus in urban complex land Ilse system
城市复合土地利用系统中土壤磷素的积累和流失潜力的空间分异

ZHANG Hui-min,ZHANG Ming-kui,
张慧敏
,章明奎

浙江大学学报(农业与生命科学版) , 2008,
Abstract: 为了解城市复合土地利用系统中土壤磷素的积累和流失潜力特点,以浙江大学华家池校区为例,应用化学分析方法和GIS技术研究该校区复合土地利用系统中土壤磷素积累和流失潜力的时空变化特征.结果表明,近50年来,研究区内土壤全磷和有效磷呈明显的增加趋势,磷素积累受城市化和大量施用有机肥、化肥等的影响.土壤磷素空间异质性非常明显,深受土地利用方式的影响,土壤全P平均含量由高至低分别为畜牧场(3.22 g?kg-1)>果园(1.67 g?kg-1)>桑园(1.54 g?kg-1)>蔬菜地(1.52 g?kg-1)>教学区(1.37 g?kg-1)、绿化用地(1.37 g?kg-1)>水田(1.14 g?kg-1)>旱地(1.06 g?kg-1)>水旱轮作地(1.02 g?kg-1)、生活区(1.02 g?kg-1).研究区内土壤磷饱和度平均达22.29%,土壤水可提取态P明显高于一般农业区,有很高的P流失风险.土壤磷饱和度25%这一磷素流失风险临界指标也适合于对研究区土壤磷流失风险的评价,该指标大致与有效P 77 mg?kg-1和全P 1.20 g?kg-1相当.研究认为,城市复合土地利用系统中土壤磷素积累显著,磷素流失造成水体污染风险很大,应引起注意.
Mobility of different forms of phosphorus in sandy soils
不同形态磷在砂土中的移动性研究(英文)

ZHANG Hui-min,ZHANG Ming-kui,
张慧敏
,章明奎

浙江大学学报(农业与生命科学版) , 2010,
Abstract: Predication of the long-term leaching of phosphorus (P) in the soil requires information of soil characteristics and behavior of P forms.This study assessed the mobility of different P forms in sandy soils that have been intensively loaded with P.Two sandy soils with different P concentration were collected at two depths (0-10 cm and 10-30 cm) from the vegetable farms in Quzhou and Wenzhou,Zhejiang Province,China.The surface soils (0-10 cm) were spiked with P (in form of KH2PO4) and amended with CaCO3 or amorphous iron oxide to obtain soil samples with different P concentration and P forms.A series of 30 cm length leaching column containing 10 cm of amended surface soils varying forms of P above 20 cm of non-amended subsoil were constructed.The soil columns were consecutively leached by 0.002 mol·L-1 CaCl2 for 12 cycles.Column leachates were collected for measurement of concentration of total reactive P (TRP),dissolved reactive P (DRP),and reactive particulate P (RPP).Changes of water soluble P,Mehlich Ⅲ-P,and P fractions in the leached soils were characterized.The results showed that addition of amorphous iron oxide and CaCO3 to soils could significantly change P forms in sandy soils,and decrease soil P availability.Amorphous iron oxide was more effective for decreasing soil P availability than CaCO3.Forms of P in leachate presented mainly for DRP,and particulate P ratio of total P ranged from 1.2% to 39.8%.The loss of the TRP and DRP were significantly correlated to P accumulation in surface soils.Both correlation analysis and changes of P forms in the soils before and after leaching indicated that P leached from the soil columns were mainly originated from H2O-P and NaHCO3-P.Twenty-seven point one percent-54.2% of the P lost from surface soils was leached out from the columns,and the remainder was downward moved into 10-30 cm soils.Addition of iron oxide to sandy soils could enhance the downward transfer of particulate P in columns.
Syntheses and Crystal Structures of Two Transition Metal Complexes (M = Mn and Co) Containing Malonate and Reduced Imino Nitroxide Radicals
Jing Chen,You-Juan Zhang,Bing-Chang Qin,Hui-Min Zhu,Yu Zhu
International Journal of Inorganic Chemistry , 2011, DOI: 10.1155/2011/257521
Abstract: Two novel transition metal complexes with malonate and reduced imino nitroxide radicals, [Co(mal)(Him2-py)2] (ClO4) 1 and [Mn (mal)(Him2-py)2] (H2O) 2 (Him2-py = 1-hydroxy-2-(2′-pyridyl)-4,4,5,5-tetramethylimidazoline) have been synthesized and their crystal structures were determined by X-ray diffraction method. During the reaction, one-electron reduction of the N–O radical moiety in IM2py has been reviewed. The structural analyses reveal that two title complexes are isostructural and crystallize in monoclinic space group C2. For the complex , , , ? with . For the complex , , , ? with . In two complexes, the coordination number around the metal ion is six, and the coordination sphere is a distorted octahedron. Two nitrogen atoms from Him2-py and two oxygen atoms from malonate are in the basal plane, and two nitrogen atoms from pyridyl rings of Him2-py at the axial position. 1. Introduction The design and synthesis of transition metal complexes with organic free radicals is one of the major challenges in the field of molecular magnetic materials [1]. Nitronyl nitroxide (NN) radicals are normally used as spin carriers to the development of molecular-based magnetic materials. However nitroxides can undergo redox reactions with transition metal ions under certain conditions [2, 3]. In fact, nitronyl free radicals are in an oxidation state intermediate between those of the hydroxylamino anion and the nitrosonium cation. Up to now, relatively little work has been devoted to the study of the redox properties of metal-nitroxyl systems and only a few complexes containing metal ions bound to the reduced monoradical have been reported [4–9]. It is known that nitronyl nitroxide radicals can undergo redox reaction with transition metal ions, yielding complexes in which the IMHR reduced form of IM acts as a diamagnetic ligand [7]. In order to extend our knowledge of extremely rich chemistry of such systems, it is necessary to further explore the reactions between metal ion and nitronyl nitroxide radicals. In this paper, we will report that syntheses and structural characterization about two novel transition metal compounds with malonate and reduced imino nitroxide radicals, [Co(mal)(Him2-py)2] (ClO4) 1 and [Mn (mal)(Him2-py)2] (H2O) 2 (Him2-py = 1-hydroxy-2-(2′-pyridyl)-4,4,5,5-tetramethylimidazoline). 2. Experimental 2.1. Syntheses 2-(2′-pyridyl)-4,4,5,5-tetramethylimidazoline-1-oxyl (im2-py) was prepared according to the methods reported [10]. [Co(mal )(Him2-py)2] (ClO4) 1: an aqueous solution (10?mL) of Na2(mal) (0.148?g,1?mmol) was added to a mixture of
Evaluation of Influence of Acupuncture and Electro-Acupuncture for Blood Perfusion of Stomach by Laser Doppler Blood Perfusion Imaging
Zhang Dong,Li Shun-Yue,Wang Shu-You,Ma Hui-Min
Evidence-Based Complementary and Alternative Medicine , 2011, DOI: 10.1093/ecam/nep050
Abstract: The objective of this study is to observe effects of acupuncture and electro-acupuncture (EA) on blood perfusion in the stomach, and probe into the application of laser Doppler blood perfusion imaging technique in the study of the effect of acupuncture and moxibustion on the entrails. In the acupuncture group of 20 rats, acupuncture was given at “Zusanli” (ST 36) and in EA group of 18 rats, EA was applied at “Zusanli” (ST 36), with 18 rats without acupuncture used as control group. Changes of blood perfusion and microcirculation distribution in the stomach were investigated with laser Doppler blood perfusion imager (LDPI). The laser Doppler blood perfusion image could clearly display changes of blood flow distribution in the stomach before and after acupuncture. After acupuncture or EA was given at “Zusanli” (ST 36), the blood perfusion in the stomach increased significantly, the blood perfusion in the blood vessels and microcirculation of other parts significantly increased, and the maximum increase of the blood perfusion was found at 10 min after acupuncture or EA, with increases of 0.50 _ 0.11 (PU) and 0.66 _ 0.16 (PU), respectively, and the blood perfusion still kept at a higher degree within 10 min after ceasing of the acupuncture or EA. While the blood perfusion in the stomach in the rat of the control group tended to gradual decrease. It has been concluded that both acupuncture and EA can increase blood perfusion in the stomach, the EA having stronger action, and LDPI can display the regulative action of acupuncture on the blood vessel of the stomach by using an image.
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