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Search Results: 1 - 10 of 114845 matches for " Ming-Jie Liu "
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Mixed Approximation for Nonexpansive Mappings in Banach Spaces
Qing-Bang Zhang,Fu-Quan Xia,Ming-Jie Liu
Abstract and Applied Analysis , 2010, DOI: 10.1155/2010/763207
Abstract: The mixed viscosity approximation is proposed for finding fixed points of nonexpansive mappings, and the strong convergence of the scheme to a fixed point of the nonexpansive mapping is proved in a real Banach space with uniformly Gâteaux differentiable norm. The theorem about Halpern type approximation for nonexpansive mappings is shown also. Our theorems extend and improve the correspondingly results shown recently.
Preparation and Characterization of Cu(In,Ga)Se2 Thin Films by Selenization of Cu0.8Ga0.2 and In2Se3 Precursor Films
Jiang Liu,Da-Ming Zhuang,Ming-Jie Cao,Chen-Yue Wang,Min Xie,Xiao-Long Li
International Journal of Photoenergy , 2012, DOI: 10.1155/2012/149210
Abstract: Se-containing precursor films with two different compositions were prepared by magnetron sputtering from and targets, and then were selenized using Se vapor. The effects of precursor composition and selenization temperature on the film properties were investigated. The results show that Se phase plays a critical role in film growth and electrical properties of CIGS films. The Cu-rich films exhibit different surface morphology and better crystallinity, as compared to the Cu-poor films. All the CIGS films exhibit p-type conductivity. The resistivity of the Cu-rich films is about three orders of magnitude lower than that of the Cu-poor films, which is attributed to the presence of p-type highly conductive Se phase. 1. Introduction Cu( )Se2 (CIGS) thin films have received considerable attention in recent years because of their application in solar cells, which have many advantages in high conversion efficiency [1, 2], the possibility of low-cost production [3, 4], and long-term stability [5, 6]. The world-record efficiency for small-area CIGS-based thin film solar cells has recently surpassed 20% [7]. One of the special qualities of the CIGS material is its variable band-gap [8]. The bandgap of chalcopyrite CIGS absorber could vary from 1.04?eV in CuInSe2 to 1.68?eV in CuGaSe2 by substituting indium for gallium. The addition of small amounts of Ga could not only raise the bandgap to more suitably match the AM1.5 solar spectrum, more importantly, but could also improve the electrical properties of CIGS films [9–11]. However, the CIGS films with higher gallium concentration show a significant loss of efficiency relative to lower gallium content films [12]. The optimal [Ga]/[In + Ga] ratio of CIGS absorber for high efficiency CIGS solar cell is considered to be 0.2~0.3 from a number of experimental results [13–15]. A variety of processing techniques have been developed to prepare high quality CIGS thin films. The two most reported processes are the coevaporation from elemental sources and the selenization of metallic precursors. The coevaporation process consists of three stages, which all need precise control over the deposition rate of each element. The selenization of metallic precursors is a two-stage process, which involves the deposition of Cu-In-Ga metallic precursors in the first step followed by their selenization using H2Se gas or Se vapor [16]. The presence of low-melting metal indium in Cu-In-Ga metallic precursors could always result in rough morphologies of the CIGS films and loss of indium from films during the ramp-up and selenization stages
Expression and purification of a functional human hepatitis B virus polymerase
Yang Yu, Dipendra Raj Pandeya, Meng-Lu Liu, Ming-Jie Liu, Seong-Tshool Hong
World Journal of Gastroenterology , 2010,
Abstract: AIM: To identify a method for efficient large-scale purification of functional hepatitis B virus polymerase (HBV-Pol) without addition of cellular factors.METHODS: Full-length HBV-Pol (843 amino acids) tagged with 5’ end Polyhistidine was expressed at a high level in an Escherichia coli (E. coli) system. Sodium dodecyl sulfate lysis buffer was utilized to dissolve insoluble HBV-Pol, and Ni-NTA resin affinity chromatography was utilized for HBV-Pol purification. Most recombinant HBV-Pol was eluted with 100 mmol/L imidazole in the presence of NP-40, a weak detergent that keeps HBV-Pol in solution. A reducing agent was utilized throughout the purification steps to keep soluble HBV-Pol from redundant disulfide bond formation.RESULTS: The large-scale production of functional intact human HBV-Pol was achieved in an E. coli expression system. Purified HBV-Pol showed stable reverse transcriptase activity and DNA polymerase activity. The purified protein was of high purity and had stable reverse transcriptase activity.CONCLUSION: Large-scale production of HBV-Pol in pure form should facilitate crystallization and detailed analysis of the structure and mechanism of HBV-Pol. Ability of this purification approach to obtain human HBV-Pol in an enzymatically active form should be helpful for development of drugs for treatment of chronic hepatitis B.
Security Analysis of Two Knapsack-Type Public Key Cryptosystems

Han Li-dong,Liu Ming-jie,Bi Jing-guo,

电子与信息学报 , 2010,
Abstract: Knapsack-type public-key cryptosystem is one of several earliest public key cryptosystems, and it is very important to analyze their security. This article argues the security of two new knapsack cryptosystems which are secure against Shamir’s attack and low density attack. A new attack method is proposed, and it is showed that can be used a polynomial time algorithm to find the secret keys with high probability, and hence break the new knapsack cryptosystems.
Zinc Regulates the Acute Phase Response and Serum Amyloid A Production in Response to Sepsis through JAK-STAT3 Signaling
Ming-Jie Liu, Shengying Bao, Jessica R. Napolitano, Dara L. Burris, Lianbo Yu, Susheela Tridandapani, Daren L. Knoell
PLOS ONE , 2014, DOI: 10.1371/journal.pone.0094934
Abstract: Sepsis rapidly activates the host inflammatory response and acute phase response. Severe sepsis, complicated by multiple organ failure, is associated with overwhelming inflammation and high mortality. We previously observed that zinc (Zn) deficiency significantly increases mortality in a mouse model of polymicrobial sepsis due to over-activation of the inflammatory response. In order to identify potential mechanisms that account for Zn-responsive effects, we generated whole exome expression profiles from the lung tissue of septic mice that were maintained on Zn modified diets. Based on systems analysis, we observed that Zn deficiency enhances the acute phase response and particularly the JAK-STAT3 pathway, resulting in increased serum amyloid A production. In vitro studies of primary hepatocytes and HepG2 cells substantiated that Zn-deficiency augments serum amyloid A production through up-regulation of the JAK-STAT3 and NF-κB pathways. In contrast, Zn inhibited STAT3 activation through the up-regulation of SHP1 activity. Collectively, these findings demonstrate that Zn deficiency enhances the acute phase response through up-regulation of the JAK-STAT3 pathway, thereby perpetuating increased inflammation that may lead to increased morbidity and mortality in response to sepsis.
Biodegradable Nanoparticles of mPEG-PLGA-PLL Triblock Copolymers as Novel Non-Viral Vectors for Improving siRNA Delivery and Gene Silencing
Jing Du,Ying Sun,Qiu-Sheng Shi,Pei-Feng Liu,Ming-Jie Zhu,Chun-Hui Wang,Lian-Fang Du,You-Rong Duan
International Journal of Molecular Sciences , 2012, DOI: 10.3390/ijms13010516
Abstract: Degradation of mRNA by RNA interference is one of the most powerful and specific mechanisms for gene silencing. However, insufficient cellular uptake and poor stability have limited its usefulness. Here, we report efficient delivery of siRNA via the use of biodegradable nanoparticles (NPs) made from monomethoxypoly(ethylene glycol)-poly(lactic- co-glycolic acid)-poly-l-lysine (mPEG-PLGA-PLL) triblock copolymers. Various physicochemical properties of mPEG-PLGA-PLL NPs, including morphology, size, surface charge, siRNA encapsulation efficiency, and in vitro release profile of siRNA from NPs, were characterized by scanning electron microscope, particle size and zeta potential analyzer, and high performance liquid chromatography. The levels of siRNA uptake and targeted gene inhibition were detected in human lung cancer SPC-A1-GFP cells stably expressing green fluorescent protein. Examination of the cultured SPC-A1-GFP cells with fluorescent microscope and flow cytometry showed NPs loading Cy3-labeled siRNA had much higher intracellular siRNA delivery efficiencies than siRNA alone and Lipofectamine-siRNA complexes. The gene silencing efficiency of mPEG-PLGA-PLL NPs was higher than that of commercially available transfecting agent Lipofectamine while showing no cytotoxicity. Thus, the current study demonstrates that biodegradable NPs of mPEG-PLGA-PLL triblock copolymers can be potentially applied as novel non-viral vectors for improving siRNA delivery and gene silencing.
Short message spreading in complex networks and longevity of short message

Li Ming-Jie,Wu Ye,Liu Wei-Qing,Xiao Jing-Hua,

物理学报 , 2009,
Abstract: In order to find factors which influences on short message spreading, we compare short message propagation on three networks: scale-free, small-world and true-life short messages networks. The topology of short message network and the behaviors of mobile phone users play important roles in determining the behavior of a short message spreading. The impact of the scale-free network on the spread of short messages is twofold: messages spread more quickly than on small-world or true-life short messages networks, but longevity of short message is less than the other networks. Some behaviors of mobile phone users obviously influence the process of short message spreading. Meanwhile, we found that the longevity of short message relate to network diameter.
Study on Degradability of Bamboo Shoot Shell Fiber Composites

GUAN Ming-jie
,ZHNAG Zhi-wei,LIU Yuan-song

- , 2018, DOI: 10.13718/j.cnki.xdzk.2018.02.023
Abstract: 为研究不同环境中竹笋壳纤维复合材料的降解特性,采用自然曝露法、土壤掩埋法、水性培养液法和纤维素酶法4种方法对复合材料进行了降解处理,测定了复合材料降解过程中的质量损失率以及降解后的相对结晶度、化学组分和微观形貌.结果表明:竹笋壳纤维复合材料在自然环境、土壤、水性培养液和纤维素酶缓冲溶液中有良好的降解性能,降解后的质量损失率依次为11.4%,21.0%,31.2%和34.3%,相对结晶度由空白对照组的40.7%依次增大到46.8%,53.1%,55.1%和57.7%,特征吸收峰发生了不同程度的降低. SEM分析表明,水性培养液降解使竹笋壳纤维表面变得更加粗糙,沟槽增大,出现较多剥落的碎片和较大的孔洞.土壤和纤维素酶缓冲溶液降解使竹笋壳纤维依次发生竹笋壳纤维表面胶质大量破坏和竹笋壳纤维内部剥离分层破坏,暴露出纤维单丝.
Bamboo shoot shell fiber composites were degraded by outdoor exposure test, soil burying test, aqueous medium test and cellulase test so as to study their degradability under different conditions. Their mass loss rate with degradation time was measured during the process of degradation. After degradation under the 4 different conditions, their relative crystallinity, chemical composition and microstructure were analyzed by XRD, FTIR and SEM. The results showed that the bamboo shoot shell fiber composites had good degradation performance under the outdoor exposure, soil, aqueous medium and cellulase conditions. After degradation under the 4 different conditions, the mass loss rates were 11.4%, 21.0%, 31.2% and 34.3%, and the relative crystallinities increased from 40.7% in the control to 46.8%, 53.1%, 55.1% and 57.7%, respectively. Their characteristic absorption peak values decreased in different degrees under the 4 degradation conditions. SEM analysis showed that after the aqueous medium degradation, the surface became rougher, the trench increased and there were many spalling debris and large holes. After the soil degradation, much surface glial disappeared and the monofilament fibers were exposed obviously. In the cellulose degradation, bamboo shoot shell fibers separated from each other inside and monofilament fibers appeared in large scale
Fermentative technology of Soybean Isofiavone Glucoside Hydrolase-Producing Strain

Xie Ming-jie XU Chun-Hua LIU Chang-Jiang LU Ming-Chun JIN Feng-Xie,

微生物学通报 , 2004,
Abstract: Absidia sp.R是从酒曲中分离出的一株产大豆异黄酮糖苷水解酶活性较高的菌株。该菌最佳产酶条件为:2.5%的麦麸为碳源,1%的硝酸钠为氮源,培养基起始pH为7.0,瓶装量为40mL/250mL,接种量8%,培养温度为30℃,转数为160r/min,培养时间为84h,其酶活力可达到82U/mL。除Cu^2 对该菌产酶有较强的抑制作用外,金属离子对产酶影响不大。
Objects recognition of ground penetrating radar in karst regions using wavelet energy spectrum analysis

LI Cai-Ming,WANG Liang-Shu,XU Ming-Jie,LIU Yuan-Sheng,ZHONG Kai,ZHANG Shan-Fa,

地球物理学报 , 2006,
Abstract: The frequency and amplitude characteristics derived from the Ground Penetrating Radar(GPR) data have been widely applied to object recognition in the karst area,but still meet some limitations.Here we present a new method using wavelet energy spectrum analysis.First we analyze the GPR signals of typical samples in the karst area and obtain their wavelet energy spectrum,which consist of the energy eigenvectors at different scales and frequency bands.Then the object recognition is achieved by comparing the characteristic energy spectrum with those of studied object.Both the data analysis and experiments demonstrate that the wavelet energy spectrum can directly show characteristics of object signals,which is very effective for the object recognition in the karst region from the GPR survey.
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