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Search Results: 1 - 10 of 127194 matches for " Li Shijie "
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An analysis on the evolvement processes of lake eutrophication and their characteristics of the typical lakes in the middle and lower reaches of Yangtze River
Xiaoying Cheng,Shijie Li
Chinese Science Bulletin , 2006, DOI: 10.1007/s11434-006-2005-4
Abstract: According to the study on the aquatic environment of the typical lakes in the middle and lower reaches of Yangtze River, lake eutrophication is a process in which the lake ecosystem degenerates, resulting in the deterioration of the water quality due to the enrichment of the nutrients. Moreover, the succession of lake ecosystem and change of water quality both couple well with the evolvement of trophic state. Then the conceptual model is mentioned and ten lake states are classified. Based on these, the authors analyzed the eutrophication processes of the typical lakes in the middle and lower reaches of Yangtze River. The large lakes with taking in-sending out water typical of Poyang Lake evolve from State 1 before the 1980s into State 2 after the 1980s, the large and medium lakes typical of Taihu Lake evolve from State 1–2 in the 1960s into State 8 in the 1980s then into State 9 in the 1990s, the medium and small shallow lakes typical of Honghu Lake evolve from State 1 in the 1960s into State 2 after the 1980s and the small city (suburban) lakes typical of Donghu Lake evolve from State 2 in the 1960s into State 9 after the 1970s. Further, the 1980s is the key conversion period of the lakes of various types typical of Poyang Lake, Honghu Lake and Taihu Lake converting into mesotrophic state, the 1990s is that of Taihu Lake into eutrophic state and the 1970s is that of the small city (suburban) lakes typical of Donghu Lake into eutrophic state. The series of nutrient evolvement of different typical lakes are similar, but the processes are not synchronous, which is related to the various human and natural driving mechanisms in lake basins.
Revelation of Three Periods of Japan Economic Development on the Economic Development of China
Shijie Ma,Jian Li
Asian Social Science , 2009, DOI: 10.5539/ass.v4n11p143
Abstract: For the development stage, the actuality of China economy is very similar to the initial stage of 1970s in Japan, so we can use some feasible experiences to solve economic problems by Japan at the beginning of 1970s. The research to the foam economy in the middle and late stage of 1980s in Japan induces the consideration whether China would follow the same old disastrous road of Japan in 1980s. After that, from the long term depression of Japan in 1990s, we should exactly treat the China depression theory which has been occurred. Reviewing the course from the boom at the beginning of 1970s to the formation and break of foam in the middle and late of 1980s and to the long term depression in 1990s of economic development experienced by Japan, we can get some revelations about many aspects such as macro-economic control and financial security.
Flow Visualization on Lateral Multiple Jet Interaction with Freestream  [PDF]
Pei Chen, Suxun Li, Shijie Luo, Zhaoyong Ni
Journal of Flow Control, Measurement & Visualization (JFCMV) , 2014, DOI: 10.4236/jfcmv.2014.21002
Abstract: The interaction flowfield of gaseous jets ejecting from three different orifice configurations into a Mach 5 turbulent crossflow over a flat plate was investigated experimentally. These jet configurations have equal equivalent throat diameter of 6 mm and nominal exit Mach number of 3. Schlieren photography was used to visualize the spatial flow structures; meanwhile surface oil flow patterns were employed to identify the separation and reattachment regions on the flat plate. Results show the influence of the jet-to-freestream static pressure ratio and jet configurations on flow interaction characteristics.
The Evolution of a Karst Rocky Desertification Land Ecosystem and Its Driving Forces in the Houzhaihe Area, China  [PDF]
Yangbing Li, Jing Xie, Guangjie Luo, Hua Yang, Shijie Wang
Open Journal of Ecology (OJE) , 2015, DOI: 10.4236/oje.2015.510041
Abstract: Understanding the evolution of karst rocky desertification (KRD) quantitatively is essential to obtain objective knowledge about the concept of KRD and the form reason of KRD, and is useful to restore KRD land. Houzhaihe area located in central plateau in Guizhou Province was studied here as a representative assemblage landform and its KRD’ s evolution and driving factors were studied, based mainly on high-resolution remote sensing image in 1963, 1978, 2005 and 2010. The KRD land comprises light KRD, moderate KRD and severe KRD. The results demonstrated that the evolution process of KRD can be divided into four modes such as unchanged, weakened, fluctuated and aggravated in the study area. The KRD with no changes from 1963 to 2010, namely, unchanged mode, accounted for 43.76% of the total area of the KRD in 2010; it distributed in the area with the slope of 15° - 25° and >25° basically. Furthermore, the severe KRD distributed mainly in the areas within 300 - 600 m distance from settlement; when the distance away from the rural settlements was more than 900 m, the severe KRD declined, and its proportion was 28.6% and 10.6% in 1963 and 2010 respectively. In the peak-cluster depressions, located in central study area, the slope cropland with slope of 15° - 25° was still abounding, and was seriously rocky desertification generally. So, we propose that the existence of a large number of slope croplands is still the major driving factor of land rocky desertification. Therefore, for the rocky desertification control, the authors consider that the focal point is to alter the land use of steep-slope cropland at present.
Epigenetic reprogramming in mammalian nuclear transfer
Shijie Li,Weihua Du,Ning Li
Chinese Science Bulletin , 2004, DOI: 10.1007/BF02889744
Abstract: Somatic cloning has been succeeded in some species, but the cloning efficiency is very low, which limits the application of the technique in many areas of research and biotechnology. The cloning of mammals by somatic cell nuclear transfer (NT) requires epigenetic reprogramming of the differentiated state of donor cell to a totipotent, embryonic ground state. Accumulating evidence indicates that incomplete or inappropriate epigenetic reprogramming of donor nuclei is likely to be the primary cause of failures in nuclear transfer. This review summarizes the roles of various epigenetic mechanisms, including DNA methylation, histone acetylation, imprinting, X-chromosome inactivation, telomere maintenance and expressions of development-related genes on somatic nuclear transfer.
Property Crime and Socioeconomic Factors  [PDF]
Shijie Yin
Open Journal of Social Sciences (JSS) , 2017, DOI: 10.4236/jss.2017.59016
Abstract:
This paper analyzes the relationship between property crime and socioeconomic factors by choosing section data of American states from 2011 to 2015. The research shows that: 1) The factors—unemployment rate, median household income and education level do not strong affect the change of property crime; the covered people of unemployment insurance policy and law enforcement are significant for variance to property crime. 2) Economic determinants should be included in the model of criminal activity, but the economic model does not explain the overall change in crime rates.
Applying Kano Theory on Career Service in Library & Learning Resources of University of Bor s
Mingzi Li,Yan Jiang,Shijie Hao
International Journal of Business and Management , 2010, DOI: 10.5539/ijbm.v6n1p76
Abstract: The purpose of this research is to evaluate the career service in Library& Learning Resources of University of Bor s (HB) and its communication channels with students based on the Kano theory in order to find which current services are basic needs, expected needs and attractive needs of students. Especially seeking potential attractive quality can make students know and experience the career service on their own initiative. From the analysis of Kano questionnaire, we could not only know students’ different needs clearly but also find suggestions and recommendations of improvement for the future.
Overexpression of ARAhPR10, a Member of the PR10 Family, Decreases Levels of Aspergillus flavus Infection in Peanut Seeds  [PDF]
Chunzheng Xie, Shijie Wen, Haiyan Liu, Xiaoping Chen, Haifen Li, Yanbin Hong, Xuanqiang Liang
American Journal of Plant Sciences (AJPS) , 2013, DOI: 10.4236/ajps.2013.43079
Abstract: Peanut (Arachis hypogaea L.) is one of the most susceptible host crops to Aspergillus flavus invasion and subsequent aflatoxin contamination. In this report, a new member of PR10 family putative resistant gene (designated as ARAhPR10, No. EU661964.1) encoding a PR10 protein was isolated and characterized. Analysis of qRT-PCR showed that the expression of ARAhPR10 was induced by pre-harvested A. flavus infection, but no significant difference was observed between resistant genotype GT-C20” and susceptible genotype Yueyou 7”. Seven transgenic peanut lines expressing the ARAhPR10 gene under the control of 35S promoter were obtained using the Agrobacterium tumefaciens
Robust Orthogonal Complement Principal Component Analysis
Yiyuan She,Shijie Li,Dapeng Wu
Statistics , 2014,
Abstract: Recently, the robustification of principal component analysis has attracted lots of attention from statisticians, engineers and computer scientists. This work focuses on the type of outliers that are not necessarily apparent in the original observation space but could affect the principal subspace estimation. Based on a mathematical formulation of such transformed outliers, a novel robust orthogonal complement principal component analysis (ROC-PCA) is proposed. The framework combines the popular sparsity-enforcing and low rank regularization techniques to deal with row-wise outliers as well as element-wise outliers. A non-asymptotic oracle inequality guarantees the performance of ROC-PCA in finite samples. To tackle the computational challenges, an efficient algorithm is developed on the basis of Stiefel manifold optimization and iterative thresholding. Furthermore, a batch variant is proposed to significantly reduce the cost in ultra high dimensions. The paper also points out a pitfall of a common practice of SVD reduction in robust PCA. Experiments show the effectiveness and efficiency of ROC-PCA in simulation studies and real data analysis.
Hydro-Chemical Processes in Lake Qinghai throughout Climate Warming: In Situ Investigations of the Largest Lake in China  [PDF]
Chuanfang Jin, Shijie Li, Hongliang Zhang, Jifeng Liu, Wei Chen, Yongjian Jiang
Natural Science (NS) , 2016, DOI: 10.4236/ns.2016.812056
Abstract:
In the wake of climate warming, the water level of Lake Qinghai has been continuously and rapidly declining during the past decades, causing the regional government and citizens to worry about its future as a water resource. To understand the lake evolution process, the hydro-chemical characteristics of Lake Qinghai were investigated in August of 2008. The results show that Na+ and Cl- are the dominant cations and anions in the lake water, respectively, and hydrochemistry type is Cl-- Na+ with an obvious characteristic of a saline lake. The Gibbs plot illuminates that evaporation/crystallization is responsible for the chemical composition of the lake water. The variation in hydro-chemical regime might be attributed to the reduced lake levels between 1960s and 2000s. The lake level significantly correlated with the precipitation and evaporation in the Lake Qinghai catchment. In addition, changes of the lake level in the future are simulated according to climate warming scenarios from the IPCC report. The simulated results suggest that the lake level could rise again in the following decades due to the increased precipitation under the climate warming conditions, which is already a trend in the lake level observation data.
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