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Search Results: 1 - 10 of 28214 matches for " Ximiao Zhu "
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Low-Temperature Reverse Microemulsion Synthesis, Characterization, and Photocatalytic Performance of Nanocrystalline Titanium Dioxide
Zhang Liu,Zicong Jian,Jianzhang Fang,Xiaoxin Xu,Ximiao Zhu,Shuxing Wu
International Journal of Photoenergy , 2012, DOI: 10.1155/2012/702503
Abstract: Nanocrystalline titanium dioxide (TiO2) was synthesized in microemulsions by using cetyltrimethylammonium bromide (CTAB) as surfactant. In order to investigate the crystal transformation and photoactivity at low temperature, the as-prepared precipitates were aged at 65°C or calcined at various temperatures. Analyses using powder X-ray diffraction (XRD) and Fourier transform infrared microscopy (FT-IR) showed that precursors without aging or calcination were noncrystal and adsorbed by surfactant. After aging for 6 h, the amorphous TiO2 began to change into anatase. The obtained catalysts, which were synthesized in microemulsions with weight ratios of n-hexanol/CTAB/water as 6 : 3 : 1 and calcined at 500°C, presented the highest photocatalytic degradation rate on methyl orange (MO), while the catalysts, which were aged at 65°C for 90 h, also exhibited an outstanding photocatalytic performance and a little higher than that of the commercial titania photocatalyst Degussa P25.
A Study of the Ni-Cr-Zr System at 900℃
A Study of the Ni-Cr-Zr System at 900°C

Ximiao PAN,Zhanpeng JIN,

材料科学技术学报 , 2002,
Abstract: The phase equilibrium relations of the ternary Ni-Cr-Zr system at 900℃ have been investigated by means of diffusion triple and electron probe microanalysis (EMPA) techniques. A series of tie lines and triangles have been determined,and the corresponding tentative isothermal section is presented based on the current information.
A Single-Nucleotide Polymorphism of Human Neuropeptide S Gene Originated from Europe Shows Decreased Bioactivity
Cheng Deng, Ximiao He, Aaron J. W. Hsueh
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0083009
Abstract: Using accumulating SNP (Single-Nucleotide Polymorphism) data, we performed a genome-wide search for polypeptide hormone ligands showing changes in the mature regions to elucidate genotype/phenotype diversity among various human populations. Neuropeptide S (NPS), a brain peptide hormone highly conserved in vertebrates, has diverse physiological effects on anxiety, fear, hyperactivity, food intake, and sleeping time through its cognate receptor-NPSR. Here, we report a SNP rs4751440 (L6-NPS) causing non-synonymous substitution on the 6th position (V to L) of the NPS mature peptide region. L6-NPS has a higher allele frequency in Europeans than other populations and probably originated from European ancestors ~25,000 yrs ago based on haplotype analysis and Approximate Bayesian Computation. Functional analyses indicate that L6-NPS exhibits a significant lower bioactivity than the wild type NPS, with ~20-fold higher EC50 values in the stimulation of NPSR. Additional evolutionary and mutagenesis studies further demonstrate the importance of the valine residue in the 6th position for NPS functions. Given the known physiological roles of NPS receptor in inflammatory bowel diseases, asthma pathogenesis, macrophage immune responses, and brain functions, our study provides the basis to elucidate NPS evolution and signaling diversity among human populations.
Systematic evaluation of genome-wide methylated DNA enrichment using a CpG island array
Liu Yang, Kunlin Zhang, Wei Dai, Ximiao He, Qian Zhao, Jing Wang, Zhong Sun
BMC Genomics , 2011, DOI: 10.1186/1471-2164-12-10
Abstract: In order to evaluate the sensitivity and accuracy of methylated DNA enrichment, we investigated and optimized a number of important parameters to improve the performance of several enrichment assays, including differential methylation hybridization (DMH), microarray-based methylation assessment of single samples (MMASS), and methylated DNA immunoprecipitation (MeDIP). With advantages and disadvantages unique to each approach, we found that assays based on methylation-sensitive enzyme digestion and those based on immunoprecipitation detected different methylated DNA fragments, indicating that they are complementary in their relative ability to detect methylation differences.Our study provides the first comprehensive evaluation for widely used methodologies for methylated DNA enrichment, and could be helpful for developing a cost effective approach for DNA methylation profiling.The most widely studied epigenetic modification in humans is cytosine methylation at CpG dinucleotides. Computational analysis predictions have indicated there are about 29,000 CpG islands in the human genome [1,2]. Approximately 70% of CpG dinucleotides in mammals are methylated and found in repetitive elements [3] whereas most CpG islands with relative high densities of unmehylated CpG dinucleotides are located at the promoter region of house-keeping genes and tumor suppressor genes and play important roles in gene expression regulation and cellular differentiation [4]. Additionally, researchers have found that DNA methylation changes occur in human cancers [5], and researches in this area have established that hypermethylation of CpG islands tends to silence tumor suppressor genes and that hypomethylation activates oncogenes [6-8].Many approaches for detecting DNA methylation are done in a gene-specific manner, such as bisulfite treatment of DNA combined with sequencing, amplification by methylation-specific PCR, or restriction enzyme-based digestion. These techniques are limited to study kn
Spermidine-induced two-dimensional DNA condensations on mica surfaces: A different pathway from condensations in solution
XingHua Zhang,XiMiao Hou,Chao Ji,Ming Li,ShuoXing Dou,PengYe Wang
Chinese Science Bulletin , 2009, DOI: 10.1007/s11434-009-0378-x
Abstract: With atomic force microscopy (AFM) we systematically studied the DNA condensations on mica surfaces induced by multivalent cation spermidine. The pattern of the DNA condensates is a flat single layer, with a core in the centre and DNA wrapping around it at high density. We assume this to be a two-dimensional condensation of free coiled DNA onto negatively charged mica surfaces by the multivalent cation. The DNA molecules condense on mica surfaces via a pathway different from the formation of toroids, rods or globules in bulk solutions. We give an explanation to why toroid structures are difficult to be observed by AFM, and further discuss the relationship between DNA condensations in solutions and on mica surfaces. The present work will be helpful for understanding the behaviors of DNA on charged surfaces, which might be significantly different from that in solutions.
A Study on the Driving Factors of Tourism Destination Brand Equity Based on Internet Sharing Content: A Case Study of Shenzhen Happy Valley  [PDF]
Ju Zhu, Mingfang Zhu
Journal of Service Science and Management (JSSM) , 2018, DOI: 10.4236/jssm.2018.116039
Abstract: Thanks to increasing mature tourists, continuous innovation on science and technology, improved accessibility of attractions, the destination has to confront the growing competition tourism destinations leading to the importance of consumer based brand equity. The paper, taking the tourists’ evaluation and sharing contents of Shenzhen Happy Valley obtained on Mafengwo website as the text material, constructs a tourism destination brand equity driving factor model with “product”, “experience” and “marketing” as the core category based on the grounded theory Through the study, the driving factors of brand equity of destination are identified, and corresponding suggestions are provided for the management of destination brand equity.
Principle and Characteristic of Lorentz Force Propeller  [PDF]
Jing ZHU
Journal of Electromagnetic Analysis and Applications (JEMAA) , 2009, DOI: 10.4236/jemaa.2009.14034
Abstract: This paper analyzes two methods that a magnetic field can be generated, and classifies them under two types: 1) Self-field: a magnetic field can be generated by electrically charged particles move, and its characteristic is that it can’t be independent of the electrically charged particles. 2) Radiation field: a magnetic field can be generated by electric field change, and its characteristic is that it independently exists. Lorentz Force Propeller (ab. LFP) utilize the characteristic that radiation magnetic field independently exists. The carrier of the moving electrically charged parti-cles and the device generating the changing electric field are fixed together to form a system. When the moving electrically charged particles under the action of the Lorentz force in the radiation magnetic field, the system achieves propulsion. Same as rocket engine, the LFP achieves propulsion in vacuum. LFP can generate propulsive force only by electric energy and no propellant is required. The main disadvantage of LFP is that the ratio of propulsive force to weight is small.
China’s Savings and Current Account Balance: A Demographic Transition Perspective  [PDF]
Chao Zhu
Modern Economy (ME) , 2011, DOI: 10.4236/me.2011.25089
Abstract: In this paper, we build an overlapping generation model to analyze how China’s family planning policy affects the demographic structure and the dependency ratios. We also employ the Cointegration Test and Granger Causality Test to examine the relationship between Chinese population dependency ratios and the national savings rate, as well as the relationship between relative productivity differences and the national current account balance. We find that the family planning policy can be sustainable with respect to these metrics. The current account balance reflects the transfer of savings over time and space. We posit that the demographic structure determines the savings transfer over time, while the relative productivity difference determines the savings transfer across the space. This transfer does not change the total welfare calculated on a national or generational basis. Consequently, focusing on improving the consumption rate to boost the economy without consideration of demographic structure transition warrants further serious discussion. Similarly, too much attention to short-term current account surplus or deficit is not productive.
Credit Rating in China’s Bond Market: Evidence from Short-Term Financing Bonds  [PDF]
Song Zhu
Modern Economy (ME) , 2013, DOI: 10.4236/me.2013.42015

In recent years, the Chinese government has highly emphasized the development of bond market, which plays an important role during the development of macro-economy and finance sector in China, especially on some crucial steps concerning national economy and the peoples livelihood, as well as reforms in banking industry and the financial innovations. However, the bond market is smaller compared with its counterparts abroad, and its structure is much simpler. To promote the development of bond market, credit rating is very important, which has been hotly discussed during and after the recent financial crisis. This paper discusses the credit rating of bond in China, particularly the short-term financing bonds (STFBs). Our results reveal that almost all credit ratings for STFBs are A-1, the highest rating, which cannot provide investors with effective information, thus being consistent with some critical voices. However, the credit ratings for issuing firms exhibit significant difference so that they are reliable benchmarks for bond investors, and credit ratings indeed reflect the risk of issuing firms in China. Our paper provides more information for foreign and domestic investors about the bond market and the credit rating in China, and gives answer to the question about efficiency of bond rating in China. We provide some evidence for the reliability of rating in China though it is still in its early stage.

Encoding Organizational Source and Associative Source under Incidental and Intentional Learning Conditions  [PDF]
Lei Zhu
Psychology (PSYCH) , 2013, DOI: 10.4236/psych.2013.49096

The present study aimed at providing a plausible answer for the controversy whether organizational source or associative source could be encoded in a more automatic manner through incidental learning. In the experiment, subjects were asked to learn organizational and associative sources under incidental or intentional learning conditions. It turned out that only associative source accuracy increased when subjects were instructed to intentionally learn that source, which implied that associative source might be encoded in a more effortful way, whereas processing of organizational source might be performed incidentally.

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