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Search Results: 1 - 10 of 7961 matches for " CUI MinLi "
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The molecular dynamic simulation on impact and friction characters of nanofluids with many nanoparticles system
Lv Jizu,Bai Minli,Cui Wenzheng,Li Xiaojie
Nanoscale Research Letters , 2011,
Abstract: Impact and friction model of nanofluid for molecular dynamics simulation was built which consists of two Cu plates and Cu-Ar nanofluid. The Cu-Ar nanofluid model consisted of eight spherical copper nanoparticles with each particle diameter of 4 nm and argon atoms as base liquid. The Lennard-Jones potential function was adopted to deal with the interactions between atoms. Thus motion states and interaction of nanoparticles at different time through impact and friction process could be obtained and friction mechanism of nanofluids could be analyzed. In the friction process, nanoparticles showed motions of rotation and translation, but effected by the interactions of nanoparticles, the rotation of nanoparticles was trapped during the compression process. In this process, agglomeration of nanoparticles was very apparent, with the pressure increasing, the phenomenon became more prominent. The reunited nanoparticles would provide supporting efforts for the whole channel, and in the meantime reduced the contact between two friction surfaces, therefore, strengthened lubrication and decreased friction. In the condition of overlarge positive pressure, the nanoparticles would be crashed and formed particles on atomic level and strayed in base liquid.
Foreign Present Condition of the Science and Technology Project Evaluation and Development Trend Research
Minli Jin
International Journal of Business and Management , 2009, DOI: 10.5539/ijbm.v3n8p123
Abstract: The science and technology project evaluation is science and technology evaluation of importance constitute part, push national science and technology business to develop continuously and healthily, promote science and technology resources excellent turn to install, suggest a high-tech management important means and guarantee of the level. This text carried on for the abroad in advance national way of doing with evaluation of the science and technology project analytical, put forward evaluating to our country science and technology project according to its evaluation characteristics and the development trend of apocalypse.
Characterisics of rare earth elements, trace elements and geological significations of BIF from Sijiaying in eastern Hebei

LI WenJun,JIN XinDi,CUI MinLi,WANG ChangLe,

岩石学报 , 2012,
Abstract: Banded iron formation (BIF), consisting of alternating layers of iron bands and silicon bands, are the most important iron resource in the world. This paper briefly presents two methods of magnetite sample preparation, and focuses on the trace elements and REEs for individual Fe-rich band and Si-rich band. The conventional dissolving method (HF+HNO3) obtains the same effect with the HBr+HF method for the magnetite samples. For the studied samples, crustal contamination can be ruled out on the basis of the generally low concentrations of Th, Zr, Sc. Both the Fe-rich bands and the Si-rich bands display depleted light REE relative to heavy REE, combined with positive La, Y anomalies, suggesting characteristics of sea water. Meanwhile, hydrothermal fluids are identified as major sources because of the positive Eu anomalies. The absence of negative Ce anomalies indicates relatively anoxic condition in the local water. The Fe-rich bands show total concentration of REE higher than the Si-rich bands, which may be related to the characteristics of silicon and iron sediment, the iron sediment is more likely to absorb REE. The high-grade ore has mixed source of hydrothermal and seawater, which has the same origin with the normal ore. Part of high-grade ore are strongly disturbed by the later hydrothermal fluid, even show the characteristics of hydrothermal fluids.
A Novel Alignment-Free Method for Comparing Transcription Factor Binding Site Motifs
Minli Xu,Zhengchang Su
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0008797
Abstract: Transcription factor binding site (TFBS) motifs can be accurately represented by position frequency matrices (PFM) or other equivalent forms. We often need to compare TFBS motifs using their PFMs in order to search for similar motifs in a motif database, or cluster motifs according to their binding preference. The majority of current methods for motif comparison involve a similarity metric for column-to-column comparison and a method to find the optimal position alignment between the two compared motifs. In some applications, alignment-free methods might be preferred; however, few such methods with high accuracy have been described.
Computational prediction of cAMP receptor protein (CRP) binding sites in cyanobacterial genomes
Minli Xu, Zhengchang Su
BMC Genomics , 2009, DOI: 10.1186/1471-2164-10-23
Abstract: We have predicted and analyzed the CRP binding sites and regulons in 12 sequenced cyanobacterial genomes using a highly effective cis-regulatory binding site scanning algorithm. Our results show that cyanobacterial CRP binding sites are very similar to those in E. coli; however, the regulons are very different from that of E. coli. Furthermore, CRP regulons in different cyanobacterial species/ecotypes are also highly diversified, ranging from photosynthesis, carbon fixation and nitrogen assimilation, to chemotaxis and signal transduction. In addition, our prediction indicates that crp genes in modern cyanobacteria are likely inherited from a common ancestral gene in their last common ancestor, and have adapted various cellular functions in different environments, while some cyanobacteria lost their crp genes as well as CRP binding sites during the course of evolution.The CRP regulons in cyanobacteria are highly diversified, probably as a result of divergent evolution to adapt to various ecological niches. Cyanobacterial CRPs may function as lineage-specific regulators participating in various cellular processes, and are important in some lineages. However, they are dispensable in some other lineages. The loss of CRPs in these species leads to the rapid loss of their binding sites in the genomes.Cyclic AMP receptor protein (CRP), also known as catabolite gene activator protein (CAP), is an important transcriptional regulator widely distributed in a variety of bacterial groups [1,2]. The biological processes under the regulation of CRP are highly diverse, including energy metabolism [3,4], cell division and development [5], toxin production [1], competence development [6], quorum sensing [7] and cellular motility [8,9]. CRP belongs to the CRP/FNR transcription factor (TF) superfamily [10], which are generally believed to function as global regulators throughout the eubacteria [11]. Each member of the CRP/FNR superfamily contains an N-terminal effector binding domain a
Performance Evaluation of Marine Industries Based on Eco-economy
Minli Gong,Yanqing Qi
International Journal of Online Engineering (iJOE) , 2013, DOI: 10.3991/ijoe.v9is2.2603
Abstract: An assessment framework is made to evaluate the performance factors of marine industries from the perspective of eco-economics by means of the AHP and the Delphi methods. Results are as follows: Performance assessment index of marine industries is decided by ecological performance, economic performance and social performance with ecological index taking priority over economic index; the efficiency of economy output and value-creating are preferred in the pursuit of low energy-consuming and less polluting marine industries; and in the near future, marine industries will make the greatest contribution to employment.
Design and development of highway tunnel maintenanceand management system
Ge Minli, Sun Lu
- , 2015, DOI: 10.3969/j.issn.1003-7985.2015.01.023
Abstract: In order to solve the urgent problem of how to manage and sustain highway tunnels with advanced information technology with the background of the rapid development in the modern traffic, and achieve the cost-effectiveness optimal principle objectives under the premise of guaranteeing a smooth flow of traffic; a highway tunnel maintenance and management system framework and the key modules were proposed. First, the determined highway tunnel condition assessment index system was established according to the result of expert consulting forms. Secondly, the tunnel diseases, the corresponding maintenance measurements, and many-to-many relationship between diseases and maintenance measurements were introduced. Then, three kinds of 0-1 integer programming models were built according to different tunnel operators’ needs in the optimization decision module. Finally, the further development and implementation of the system was prospected. The research results can provide references to tunnel researchers and managers.
Geological characteristics, ages of host rocks and its geological significance of the Zhoutaizi iron deposit in Luanping, Hebei Province

XIANG Peng,CUI MinLi,WU HuaYing,ZHANG XiaoJing,ZHANG LianChang,

岩石学报 , 2012,
Abstract: Zhoutaizi iron deposit lies on the northern margin of the North China Craton, which is located in Luanping, Hebei Province. The iron deposit occurred in the metamorphic rocks, Dantazi Group of Precambrian. And the deposit which has obvious banded iron formations is an Anshan type iron deposit. The banded structure is obvious in ore rock, whereas striate and massive structure is rare. The quartz magnetite type is the main ore rock type which contains 30%~35% irons. The main wall rock is the metamorphic rocks in Precambrian including biotite plagiogneiss, amphibolite and granitic gneiss. The granitic gneiss is characterized as SiO2>56%, MgO<3%, Al2O3>15%, Sr>500×10-6, Yb>1.9×10-6, obvious fractionation between HREE and LREE, HREE depleted strongly, inconspicuous negative Eu anomalies. It is indicated that the granitic gneiss is geochemically similar to adakite. Zircon U-Pb analysis has shown several different ages, which are 2512±21Ma, 2452±9.6Ma, 2394±55Ma, respectively. First of all, the ages around 2512Ma represent the volcanic eruption event and the sedimentary age of BIF deposit. Secondly, the ages around 2452Ma represent the crystallization age of TTG granitic gneiss. At last the ages around 2394Ma represent a metamorphic event which resulted in the modification of original rocks and ore rocks. The Hf isotope data indicates that the magma source of amphibolite and TTG granitic gneiss may be contaminated by ancient crustal material. And therefore the tectonic setting of Zhoutaizi iron deposit was extensional related to rifts.
Genetic type, formation age and tectonic setting of the Waitoushan banded iron formation, Benxi, Liaoning Province

DAI YanPei,ZHANG LianChang,WANG ChangLe,LIU Li,CUI MinLi,ZHU MingTian,XIANG Peng,

岩石学报 , 2012,
Abstract: Anshan-Benxi area in Liaoning Province, where plenty of large-superlarge banded iron formations are distributed, is located at the northeastern part of the North China craton. Petrology, mineralogy and geochronology of the Waitoushan iron deposit in Anshan-Benxi area are studied in this paper. Iron ores in the Waitoushan deposit are predominantly banded, with a scrap of massive. The Archean amphibolites in the Anshan Group were developed as main wall rocks and interlayer among the orebodies. Geochemical analyses show the iron ores are enriched in HREE (La/Yb)PAAS=0.24~0.33], and characterized by positive La anomaly (La/La*=1.43~1.61), positive Eu anomaly (Eu/Eu*=2.40~4.54) and positive Y anomaly (Y/Y*=1.10~1.30) with Y/Ho=30.59, Sr/Ba=17.62, Ti/V=19.45, indicating the ore-forming materials were derived from the intermixture of high temperature hydrotherm and seawater. There is no distinct negative Ce anomaly (Ce/Ce*=0.92~1.06), imlying the seawater was under anoxic condition during the deposition of the Waitoushan BIF. Apart from Fe2O3T and SiO2, the contents of other oxides are rather low, with depletion in continental origin elements (such as Tu, U, Zr), implying the continental detrital materials contributed little to the metallogenic process of the Waitoushan BIF. The chondrite-normalized REE pattern of amphibolites is flat (La/Yb)N=0.80~1.10] with no distinct Ce anomalies (Ce/Ce*=0.95~0.99) and Eu anomalies (Eu/Eu*=0.88~1.16), while the N-MORB-normalized trace element pattern shows enrichment in LILE without pronounced depletion in HFSE. Geochemical analyses show the protolith of amphibolites was probably basic volcanics originating in back-arc basin setting. Morphology and trace element analyses of zircon grains indicate the zircons selected from amphibolites were all magmatic. SIMS zircon U-Pb dating shows the protolith of amphibolites was formed at 2533±11Ma, standing for the formation age of the Waitoushan iron deposit. During the eruption of basaltic magma, a group of zircons with the age of 2610±5Ma were captured. Electron microprobe analysis shows the composition of magnetites is pure and single (FeOT=92.04%~93.05%), and the typomorphic studies indicate the Waitoushan deposit is attached to metamorphosed sedimentary iron deposit. To sum up, we propose the Waitoushan deposit belongs to the Algoma-type BIF, showing an affinity with the magmation in back-arc basin setting and representing a Neoarehean metallogenic event of BIF widely developed in the North China craton.
Computational analysis of LexA regulons in Cyanobacteria
Shan Li, Minli Xu, Zhengchang Su
BMC Genomics , 2010, DOI: 10.1186/1471-2164-11-527
Abstract: Our analysis indicates that six of 33 sequenced cyanobacterial genomes do not harbor a lexA gene although they all encode the key SOS response genes, suggesting that LexA is not an indispensable transcription factor in these cyanobacteria, and that their SOS responses might be regulated by different mechanisms. Our phylogenetic analysis suggests that lexA was lost during the course of evolution in these six cyanobacterial genomes. For the 26 cyanobacterial genomes that encode a lexA gene, we have predicted their LexA-binding sites and regulons using an efficient binding site/regulon prediction algorithm that we developed previously. Our results show that LexA in most of these 26 genomes might still function as the transcriptional regulator of the SOS response genes as seen in E. coli and other organisms. Interestingly, putative LexA-binding sites were also found in some genomes for some key genes involved in a variety of other biological processes including photosynthesis, drug resistance, etc., suggesting that there is crosstalk between the SOS response and these biological processes. In particular, LexA in both Synechocystis sp. PCC6803 and Gloeobacter violaceus PCC7421 has largely diverged from those in other cyanobacteria in the sequence level. It is likely that LexA is no longer a regulator of the SOS response in Synechocystis sp. PCC6803.In most cyanobacterial genomes that we analyzed, LexA appears to function as the transcriptional regulator of the key SOS response genes. There are possible couplings between the SOS response and other biological processes. In some cyanobacteria, LexA has adapted distinct functions, and might no longer be a regulator of the SOS response system. In some other cyanobacteria, lexA appears to have been lost during the course of evolution. The loss of lexA in these genomes might lead to the degradation of its binding sites.The LexA protein was first characterized as the transcriptional regulator of the SOS response in Escherichia c
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