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Search Results: 1 - 10 of 17107 matches for " Shuchun Fu "
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The isotopic abundance and atomic weight of natural uranium
Yongfu Liu,Shuchun Fu
Chinese Science Bulletin , 1997, DOI: 10.1007/BF02882489
Abstract: The published measurement data of atomic weight of uranium are shown in table 4[9]. The best results are those measured by Smith and Cowanet al. A r (U) = 238.028 79–238.028 90(3), their result error being ISD. The evaluated value of IUPAC-CAWIA is Ar(U)=238.028 9(1). In this work, the result is Ar(U) = 238.028 91(4). The combined uncertainty has been given according to 2SD of the measurement data through the calibration of a series of standard materials of uranium isotopes. It is reasonable to conclude that in this work the uncertainty which characterizes the measurement quality is better than other published data.
The isotopic abundance and atomic weight of natural uranium

Yongfu Liu,Shuchun Fu,

科学通报(英文版) , 1997,
Abstract: Conclusion The published measurement data of atomic weight of uranium are shown in table 49]. The best results are those measured by Smith and Cowanet al. A r (U) = 238.028 79–238.028 90(3), their result error being ISD. The evaluated value of IUPAC-CAWIA is Ar(U)=238.028 9(1). In this work, the result is Ar(U) = 238.028 91(4). The combined uncertainty has been given according to 2SD of the measurement data through the calibration of a series of standard materials of uranium isotopes. It is reasonable to conclude that in this work the uncertainty which characterizes the measurement quality is better than other published data.
A Critical Study of the Elastic Properties and Stability of Heusler Compounds: Phase Change and Tetragonal X2YZ Compounds  [PDF]
Shuchun Wu, S. Shahab Naghavi, Gerhard H. Fecher, Claudia Felser
Journal of Modern Physics (JMP) , 2018, DOI: 10.4236/jmp.2018.94050
Abstract: In the present work, the elastic constants and derived properties of tetragonal Heusler compounds were calculated using the high accuracy of the full-potential linearized augmented plane wave (FPLAPW) method. To find the criteria required for an accurate calculation, the consequences of increasing the numbers of k-points and plane waves on the convergence of the calculated elastic constants were explored. Once accurate elastic constants were calculated, elastic anisotropies, sound velocities, Debye temperatures, malleability, and other measurable physical properties were determined for the studied systems. The elastic properties suggested metallic bonding with intermediate malleability, between brittle and ductile, for the studied Heusler compounds. To address the effect of off-stoichiometry on the mechanical properties, the virtual crystal approximation (VCA) was used to calculate the elastic constants. The results indicated that an extreme correlation exists between the anisotropy ratio and the stoichiometry of the Heusler compounds, especially in the case of Ni2MnGa. Metastable cubic Ni2MnGa exhibits a very high anisotropy (28) and hypothetical cubic Rh2FeSn violates the Born-Huang stability criteria in the L21 structure. The bulk moduli of the investigated tetragonal compounds do not vary much (130 ...190 GPa). The averaged values of the other elastic moduli are also rather similar, however, rather large differences are found for the elastic anisotropies of the compounds. These are reflected in very different spatial distributions of Young’s moduli when comparing the different compounds. The slowness surfaces of the compounds also differ considerably even though the average sound velocities are in the same order of magnitude (3.2 ... 3.6 km/s). The results demonstrate the importance of the elastic properties not only for purely tetragonal Heusler compounds but also for phase change materials that exhibit magnetic shape memory or magnetocaloric effects.
Diagnosis of Premature Senescence of Cotton Using SPAD Value  [PDF]
Pengcheng Li, Helin Dong, Aizhong Liu, Jingran Liu, Miao Sun, Guoping Wang, Siping Zhang, Yabing Li, Shuchun Mao
Agricultural Sciences (AS) , 2014, DOI: 10.4236/as.2014.511107
Abstract: Field experiments were conducted in 2011 on an experimental farm at the Cotton Research Insti-tute, Chinese Academy of Agricultural Sciences, Anyang, China. We conducted experiments with a “SPAD-502” meter to quickly measure the relative value of chlorophyll content in the leaf blades of field cotton. Our goal was to seek a suitable leaf on a cotton plant to diagnose senescence status of crop plants at later stages of growth. We began by studying the dynamic change rule of the dis-tal-most four leaves of the cotton plant during the entire growth period with two early-maturing cultivars (CCRI 36, CCRI 50) and two mid-maturing cultivars (CCRI 41, SCRC 28). We also examined the effect of different nitrogen and potassium fertilizer rates on SPAD values of the leaves of SCRC 28. Our results suggest that SPAD values of the 1st distal stem leaves from two early cultivars can act as good indicators of senescence status in the plants, if they are measured between 10 d before the boll-opening stage and 10 d after boll opening stage. Differences of SPAD values of the 3rd distal stem leaves of two mid-maturing cultivars measured between about 15 d before the boll opening stage and 15 d after the boll opening stage can also be used to measure senescence status in these cotton cultivars. The conclusion can be used for cotton producer to manage N fertilizer better at later growth stage.
Association of Interleukin-8 with Cachexia from Patients with Low-Third Gastric Cancer
Bo Song,Dianliang Zhang,Shuchun Wang,Hongmei Zheng,Xinxiang Wang
Comparative and Functional Genomics , 2009, DOI: 10.1155/2009/212345
Abstract: Background. Interleukin (IL)-8 has been implicated in the development of cancer cachexia. The polymorphism of IL-8 gene, which may affect the production level of IL-8, may be associated with cancer cachexia. Methods. The serum IL-8 level in our study was examined by radioimmunoassay. We also analyzed single nucleotide polymorphisms (SNPs) −251 A/T and
Image Storage and Function of Image Addition and Subtraction in Infrared Stimulated Phosphors
红外激励发光材料的图象存储与加减功能

CHEN Shuchun,DAI Fengmei,
陈述春
,戴凤妹

无机材料学报 , 1997,
Abstract: 报道了SrS(Eu、Sm)的写入、读出和发光射光谱分布及输出发光对输入光强的关系,利用-100μm厚度SrS(Eu、Sm)薄膜进行了图象存储和加减功能的实验,结果表明,该材料在光信息存储和处理中具有很大的应用前景。
RECENT ENVIRONMENTAL EVOLUTION OF SHIJIUHU LAKE INFERRED FROM LAKE SEDIMENTS
石臼湖近代环境演化历史

Yao Shuchun,Xue Bin,
姚书春
,薛滨

第四纪研究 , 2009,
Abstract: 以2007年在石臼湖采集的浅岩芯钻孔(SJH07-C1)研究近代石臼湖湖泊环境演化历史以及人类活动的影响.运用核素 210 Pb和 137 Cs进行定年,210 Pb 的CRS模式定年结果与 137 Cs方法获得的年代具有较好的可比性.同时分析了岩芯沉积物的理化指标,包括烧失量、总磷、金属元素和磁化率.分析表明:1955年以前地球化学指标表明石臼湖湖泊沉积物中人类活动信息较弱,但总磷和有机质(烧失量)开始出现增加,湖泊营养水平开始升高.1955~1969年,湖泊沉积物磁化率较高,重金属(包括铜、铅、锌和汞)含量快速增加,可能与该期开始大量使用化肥、农药有关,导致入湖污染物增加.1969~1997年期间,1969~1979年时段湖泊沉积物磁化率最高,重金属含量比较稳定,在石臼湖进行了大规模的围垦;1979~1997年,湖泊沉积物磁化率较高但呈减少趋势,重金属含量再次快速增加,总磷增加较快,说明该阶段入湖污染物增加,湖泊营养水平也在增加.1997~2007年,磁化率较低,重金属含量保持在高水平,总磷快速增加,显示该阶段湖泊营养水平较高,但入湖物质通量在减少.
A KIND OF HIGH EFFICIENCY INFRARED UPCONVERSION LUMINESCENT MATERIAL
一类高效红外上转换材料

Chen Shuchun,Dai Fengmei,
陈述春
,戴凤妹

红外与毫米波学报 , 1996,
Abstract: Three types of upconversion photoluminescent material were reported,which are sensitive to infrared radiation and can emit orange red light.The luminescence and absorption spectra,relative sensitivity and input output relationship were presented.
Lake evolution and its implication for environ-mental changes in China during 1950?2000

HUANG Zhihua,XUE Bi,YAO Shuchun,PANG Yong,

地理学报 , 2008,
Abstract: Lakes in China have undergone considerable environmental changes during the past 50 years, e.g. lake level, water area changes, as did in the past several thousands years. The enhanced human activities, such as land reclamation, application of chemical fertilizer, land use and cover, irrigation and industrialization in the catchment etc., have played an im-portant role on the recent decades’ changes of these lakes, although constrained to a great extent by the natural impact. Comparative study on variations of lake volume (water level, depth and area) in the eastern and western lake regions of China during 1950–2000 indicated that, lake volume in the eastern region had approximately undergone a two-stage change, i.e. a dramatic decrease from the 1950s to 1970s, and a continuous increase between the 1980s and 1990s; while, in the western region, lake volume had been decreasing nearly all the time. Further studies on some typical lakes concluded that, climatic change was a primary factor for the variations of lake volume during the past 50 years, although human activities showed important effect.
Spatial statistical analysis on randomness of spatial distributed parameters in groundwater environmental assessment
地下水环境评价中分布参数随机性的空间统计分析

ZHANG Zheng,LIU Shuchun,
张征
,刘淑春

环境科学学报 , 1999,
Abstract: The spatial distributed parameters in groundwater environmental assessment bear complex uncertainty. In this paper, the characteristics of spatial structure and random in the spatial distributed parameters are analyzed. The principles and approaches of spatial statistical analysis on distributed variables are also elaborated. As a result of applying a new statistical method to analyze the uncertainty in the spatial distributed parameters, the deficiency of classical statistics in analysis on randomness of spatial distributed parameters of groundwater environmental assessment can be remedied, thus the spatial structural information and the spatial optimum estimation of the distributed parameters can be gained. As such, the spatial statistical analysis on spatial distributed parameters in groundwater environmental assessment tends to be more practical and rational.
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