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Search Results: 1 - 10 of 9180 matches for " Dazhi Meng "
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A Novel Analytical Method for Structural Characteristics of Gene Networks and its Application  [PDF]
Shudong Wang, Yuanyuan Zhang, Kaikai Li, Dazhi Meng
Computational Molecular Bioscience (CMB) , 2012, DOI: 10.4236/cmb.2012.23009
Abstract: Analyzing gene network structure is an important way to discover and understand some unknown relevant functions and regulatory mechanisms of organism at the molecular level. In this work, mutual information networks and Boolean logic networks are constructed using the methods of reverse modeling based on gene expression profiles in lung tissues with and without cancer. The comparison of these network structures shows that average degree, the proportion of non-isolated nodes, average betweenness and average coreness can distinguish the networks corresponding to the lung tissues with and without cancer. According to the difference of degree, betweenness and coreness of each gene in these networks, nine structural key genes are obtained. Seven of them which are related to lung cancer are supported by literatures. The remaining two genes AKT1 and RBL may have important roles in the formation, development and metastasis of lung cancer. Furthermore, the contrast of these logic networks suggests that the distributions of logic types are obviously different. The structural differences can help us to understand the mechanism of formation and development of lung cancer.

Xu Dashun,Meng Dazhi,

生物物理学报 , 1998,
Abstract: Oscillation and periodicity has been found in a lot of researches about biological medicine. Here, we set up a mathematical model about the effect of protein C on blood coagulation. Through the dynamic analysis of the model, some new conclusions were obtained. They may be contributed on blood coagulation theory and clinical medicine, in particular, the existence of periodical oscillation is an interesting phenomenon. In addition, some conclusions that accord with clinical medicine were acquired, it was shown that the model method acts important function in research of dynamic blood coagulation system..
First-Principle Investigation of O2 Adsorption on the NiTi Alloy (110) Surface
First-Principle Investigation of O_2 Adsorption on the NiTi Alloy (110) Surface

Yingjie HUA,Xin LIU,Changgong MENG,Dazhi YANG,
Yingjie HUA
,Xin LIU Changgong MENG and Dazhi YANG

材料科学技术学报 , 2004,
Abstract: The discrete-variational method within the framework of density functional theory was used to investigate the process of O2 adsorption occurring on the surface of NiTi alloy. The calculated results showed that O2 exhibits the adsorption state of Oδ-2 (0.36<δ<0.70). O2 only interact with one nearest surface Ti atom, and the Ti atom only adsorbs one oxygen atom of the O2 molecule. Other cluster atoms would not be influenced in the adsorption process. The density of state analysis showed that the interaction between Ti and O atom is mainly contributed to 2p (O) and 4s (Ti) orbitals.

Meng DaZhi,Wang Feng,Wang Li,

生物物理学报 , 1998,
Abstract: Cascade mechanism of blood coagulation system shows an enzymatic reaction process,in which a series of blodd coagulation factors are involoved and have an orderly relationships.amplifier cascade between blood coagulation factors. The whole relationship forms an orderly construction of the system. From the point of view of the system theory, the properties and functions of the system is characterized by its constructions. Therefore, using modelling mehod and the orderly construction analytical method established on the basis of the orderly relationships of the blood coagulation factors, the interactions among the factors of blood coagulation can be analyzed. In this paper, the two inhibitors, protein C (APC) and IFPI, participating in the extrinsic pathway of blood coagulation are clarified.
Role of the South China Sea Summer Upwelling in Tropical Cyclone Intensity  [PDF]
Dazhi Xu, Chunhua Qiu, Youfang Yan
American Journal of Climate Change (AJCC) , 2019, DOI: 10.4236/ajcc.2019.81001
Abstract: Tropical cyclones (TCs) can affect the thermal structure in the upper ocean by mixing. In turn, upper-ocean thermal structure also affects the evolution of TCs. Here based on satellite data, in situ temperature and salinity observations and the best-track data of the U.S. Joint Typhoon Warning Center, combined with an ocean mixed layer model, the role of the pre-existing summer upwelling of the northern South China Sea (NSCS) in TCs self-induced sea surface cooling was explored. The modeling results showed that for a given atmospheric thermodynamic condition, TCs self-induced sea surface cooling is quite different when they pass over the regions with pre-existing upwelling and without upwelling. The amplitude of TCs self-induced cooling is larger by more than 50% in the region with pre-existing upwelling than that without. For example, for a slow-moving typhoon with translation speed of 4 m/s and wind speed of 45 m/s, TC self-induced surface cooling is 2.5°C when they pass over the upwelling region, but only 1.5°C when they pass over the region without upwelling. The results suggest that upwelling of the NSCS could amplify TCs self-induced cooling and play a negative role in TCs intensification before they made landfall in Southern China.
New Laser Fusion and Its Gain by Intense Laser
Kazuo Imasaki,Dazhi Li
Energies , 2010, DOI: 10.3390/en3061176
Abstract: The feasibility of a new approach of laser fusion in plasma without implosion has been proposed and is discussed using an intense laser. The cross section of the nuclear reaction is increased by enhancing the penetrability of nuclei through the Coulomb barrier. In this approach, an intense laser field of more than 100 PW was required to distort the Coulomb barrier to obtain enough penetrability. An energy gain even with Deuterium-Deuterium (D-D) reaction can be obtained using this scheme in Deuterium plasma. A reactor with neutron and direct conversion of charged particle beam individually is proposed. Charged particles from D-D reaction are guided to the end of the reactor and are directly converted by a MHD scheme into electric energy. The energy recovery rate is high and requires a small amount of laser energy, which may make the energy cost cheaper than that of a fission reactor.
Molecular Dynamic Simulation Study on Glass Transition Temperature of DGEBA-THPA/SWCNTs Composites  [PDF]
Cai Jiang, Jianwei Zhang, Shaofeng Lin, Dazhi Jiang
Journal of Materials Science and Chemical Engineering (MSCE) , 2014, DOI: 10.4236/msce.2014.21005

Molecular dynamic (MD) simulations were carried out to predict the thermo-mechanical properties of the cured epoxy network composed of diglycidyl ether bisphenol A (DGEBA) epoxy resin and tetrahydrophthalic anhydride (THPA) curing agent and their single-walled carbon nanotubes (SWCNT) reinforced the epoxy matrix composites. Different characters such as the density of the materials and mean square displacements (MSDs) were calculated to estimate the glass transition temperatures (Tgs) of of the materials. 365 K and 423 K of the Tgs were obtained respectively, whereas the latter is much higher than the former. The simulation results indicated that the incorporation of SWCNTs in the epoxy matrix can significantly improve the Tg of the cured epoxy. The approach presented in this study is ready to be applied more widely to a large group of candidate polymers and nanofillers.

Positron Annihilation Study of the Quenched-in Vacancies in CuZnAl Alloys
Zhongguo WEI,Dazhi YANG,

材料科学技术学报 , 1995,
Abstract: The excess vacancies in ternary CuZnAl and Ti-doped CuZnAl alloys quenched from temperatures between 673 K and 1223 K, and the behaviour of the quenched-in vacancies on postquench aging in martensite phase have been studied by Doppler broadening measurements. It has been found that adding Ti to the alloys resuIts in the formation of vacancy-Ti solute atom complexes which lowers the mobility of the vacancies. In the Ti-free alloy, the prominent changes in the lineshape S-parameter during the early stage of martensite aging have evidenced the occurrence of vacancy migration to sinks, clustering or vacancy related atomic distortion. The role of the vacancies in martensite stabilization has been discussed
A Two-Species Cooperative Lotka-Volterra System of Degenerate Parabolic Equations
Jiebao Sun,Dazhi Zhang,Boying Wu
Abstract and Applied Analysis , 2011, DOI: 10.1155/2011/714248
Abstract: We consider a cooperating two-species Lotka-Volterra model of degenerate parabolic equations. We are interested in the coexistence of the species in a bounded domain. We establish the existence of global generalized solutions of the initial boundary value problem by means of parabolic regularization and also consider the existence of the nontrivial time-periodic solution for this system.

Du Dazhi,

生态学报 , 1989,
Abstract: Elaeagnus mollis Diels is a rare oil tree of high economic values in actinorhi-zal plant resources in China. Its ecological characteristics and the relations between ecological factors and the nodular nitrogenase activity were surveyed and studied.Surveying results indicated that the origin of Elaegnus mollis Diels is from warm temperat zone and semi-arid climate zone and it grows in drab soil of low mountain and hilly land. This species is characterised by a high tolerance to drought, cold and barren and a high adaptability. Developing this species in middle reaches of the Yellow River and some Eerious soil erosion regions in China is of high economical and ecological benefits.Research results indicated that the nitrogenase activity of root nodules in Elaeagnus mollis Diels during the growing seasons shows two periods of high rate, the first in June, and the second in September. The seaeonal variations of nitrogenase activity are restricted by ecological factors and metabolic factors of host plant. The influence of temperature on nodular nitrogenase activity is obvious. Photosynthetic intensity is in close relation with nitrogenase activity, but without synchronism. The influence of sexual reproductive growth on nitrogenase activity during different seasons is due to the result of competition for photosynthate allocation between both. Planting Elaeagnus mollis dramatically increased the nitrogen content of soil in woodland. Soil nitrogen contents under 12 year-old artificial forest and 20 year-old artificially transformed forest increased by 75% and 99% over those of natural Vegetation on a waste slope, respectively.
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