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Search Results: 1 - 10 of 45008 matches for " LIANG Zheng "
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Kinetics Analyzing of Direction Reduction on Manganese Ore Pellets Containing Carbon  [PDF]
Bo Zhang, Zheng-Liang Xue
International Journal of Nonferrous Metallurgy (IJNM) , 2013, DOI: 10.4236/ijnm.2013.23017
Abstract: Using high temperature carbon tube furnace, reduction of manganese ore pellets containing carbon was investigated. The reaction was divided into two stages at five minutes after reaction, and the kinetics model of reduction process was established. The experimental results showed that, the reaction rate in the earlier stage was controlled by the chemical reactions between FeO, MnO and carbon reductant, and the activation energy was 28.85 KJ/mol. In the later stage, as the carbon reductant replaced by CO, the reaction rate was controlled by CO-diffusing in solid products, and the cor- responding activation energy was 86.56 KJ/mol. Reaction rate of the later stage was less than the earlier one.
Optimization of Tracking Error for Robust Portfolio of Risk Assets with Transaction Cost  [PDF]
Dong Zheng, Xi-kun Liang
iBusiness (IB) , 2013, DOI: 10.4236/ib.2013.51B005
Abstract: Based on the optimization of robust portfolio with tracking error, a robust mean-variance portfolio selection model of tracking error with transaction cost is presented for the case that only risky assets exist and expected returns of assets are uncertain and belong to a convex polyhedron. This paper aims to solve the problem of the portfolio with the selection of the ratio on the condition of maximumimum fluctuation of the tracking error, making the expectation of the return to be the maximumimum. It also makes the portfolio’s practical choice by the function of the linear transaction cost as the same time of construction and application of the model. Empirical analysis with five real stocks is performed by the method of LMI (Linear Matrix Inequality) to show the efficiency of the model.
An Algorithm of 0-1 Knapsack Problem Based on Economic Model  [PDF]
Yingying Tian, Jianhui Lv, Liang Zheng
Journal of Applied Mathematics and Physics (JAMP) , 2013, DOI: 10.4236/jamp.2013.14006
Abstract:

In order to optimize the knapsack problem further, this paper proposes an innovative model based on dynamic expectation efficiency, and establishes a new optimization algorithm of 0-1 knapsack problem after analysis and research. Through analyzing the study of 30 groups of 0-1 knapsack problem from discrete coefficient of the data, we can find that dynamic expectation model can solve the following two types of knapsack problem. Compared to artificial glowworm swam algorithm, the convergence speed of this algorithm is ten times as fast as that of artificial glowworm swam algorithm, and the storage space of this algorithm is one quarter that of artificial glowworm swam algorithm. To sum up, it can be widely used in practical problems.

Capability of TCSC on SSR Mitigation  [PDF]
Rui Zheng, Gen Li, Jun Liang
Journal of Power and Energy Engineering (JPEE) , 2015, DOI: 10.4236/jpee.2015.34032
Abstract:

TCSC (Thyristor-Controlled Series Compensator) has been used in modern power systems to increase power transfer and system stability. Besides, due to its controllable feature, TCSC has been used to work as a solution to sub-synchronous resonance (SSR) problems. However, it is not clear so far whether TCSC’s inherent characteristic can avoid SSR and its effectiveness for SSR damping. In this paper, an equivalent circuit of TCSC is used to better understand how TCSC performs at sub-synchronous frequency ranges. Therefore, interactions of TCSC behaviors and SSR components can be viewed individually. The effects of TCSC operation interfered by sub-synchronous components are discussed. Results show that TCSC has the capability to damp SSR, but this capability can be deteriorated if TCSC firing logic cannot be effectively maintained.

An Efficient Electro-Competent Cells Generation Method of Xanthomonas campestris pv. campestris: Its Application for Plasmid Transformation and Gene Replacement  [PDF]
Xiuli Wang, Daning Zheng, Rubing Liang
Advances in Microbiology (AiM) , 2016, DOI: 10.4236/aim.2016.62008
Abstract: A simple and rapid method to prepare efficient electro-competent cells of Xanthomonas campestris pv. campestris was generated, with up to 100-fold transformation efficiencies over the existing procedures. The overnight cultures were treated with sucrose solution and micro-centrifuged at room temperature; the entire electro-competent cells generation process can be completed in 15 minutes. It overcomes the complication and time-consuming shortcomings of the traditional conjugation or electro-transformation methods in this strain. Both the replicative plasmids and non-replicative plasmids could be transformed or integrated efficiently using this method. And the DNA concentration, cells growth stage, field strength and recovery time all had influences on the transformation efficiency. In the optimal conditions, the transformation efficiency for the replicative plasmids was 109 transformants per microgram DNA, and for non-replicative plasmids was 150 transformants per microgram DNA. Further with the homology sequences, two chromosomal target genes were deleted efficiently and the knockout strains were obtained easily.
Identify Alternative Splicing Events Based on Position-Specific Evolutionary Conservation
Liang Chen, Sika Zheng
PLOS ONE , 2008, DOI: 10.1371/journal.pone.0002806
Abstract: The evolution of eukaryotes is accompanied by the increased complexity of alternative splicing which greatly expands genome information. One of the greatest challenges in the post-genome era is a complete revelation of human transcriptome with consideration of alternative splicing. Here, we introduce a comparative genomics approach to systemically identify alternative splicing events based on the differential evolutionary conservation between exons and introns and the high-quality annotation of the ENCODE regions. Specifically, we focus on exons that are included in some transcripts but are completely spliced out for others and we call them conditional exons. First, we characterize distinguishing features among conditional exons, constitutive exons and introns. One of the most important features is the position-specific conservation score. There are dramatic differences in conservation scores between conditional exons and constitutive exons. More importantly, the differences are position-specific. For flanking intronic regions, the differences between conditional exons and constitutive exons are also position-specific. Using the Random Forests algorithm, we can classify conditional exons with high specificities (97% for the identification of conditional exons from intron regions and 95% for the classification of known exons) and fair sensitivities (64% and 32% respectively). We applied the method to the human genome and identified 39,640 introns that actually contain conditional exons and classified 8,813 conditional exons from the current RefSeq exon list. Among those, 31,673 introns containing conditional exons and 5,294 conditional exons classified from known exons cannot be inferred from RefSeq, UCSC or Ensembl annotations. Some of these de novo predictions were experimentally verified.
Studying alternative splicing regulatory networks through partial correlation analysis
Liang Chen, Sika Zheng
Genome Biology , 2009, DOI: 10.1186/gb-2009-10-1-r3
Abstract: We propose the use of partial correlation analysis to identify association links between exons and their upstream regulators or their downstream target genes (exon-gene links) and links between co-spliced exons (exon-exon links). The partial correlation analysis avoids taking the ratio of two noisy random variables, exon expression level and gene expression level, so that it achieves a higher statistical power. We named this analysis procedure pCastNet (partial Correlation analysis of splicing transcriptome Network). Through studies of known alternative exons, conservation patterns, relative positions, functional annotations, and RT-PCR experiments, we concluded that pCastNet can effectively identify exon-gene or exon-exon links. We further found that gene pairs with exon-gene or exon-exon links tend to have similar functions or are present in the same pathways. More interestingly, gene pairs with exon-gene or exon-exon links tend to share cis-elements in promoter regions and microRNA binding elements in 3' untranslated regions, which suggests the coupling of co-alternative-splicing, co-transcription-factor-binding, and co-microRNA-binding.Alternative splicing regulatory networks reconstructed by pCastNet can help us better understand the coordinate and combinatorial nature of alternative splicing regulation. The proposed tool can be readily applied to other high-throughput data such as transcriptome sequencing data.Alternative pre-mRNA splicing is an important gene regulation mechanism for expanding proteomic diversity in higher eukaryotes. It has been estimated that 59-74% of human genes are alternatively spliced [1,2], and abnormal mRNA splicing contributes to many human diseases [3-5]. The alternative splicing of multiple pre-mRNAs is tightly regulated and coordinated, which is an essential component for many biological processes, including nervous system development and programmed cell death [6,7]. In the process of alternative splicing, splicing regulators bin
Thermoequilibrium statistics for a finite system with energy nonextensivity
Liang Zheng,Wei Li
Chinese Science Bulletin , 2011, DOI: 10.1007/s11434-011-4726-2
Abstract: A first-principles derivation is presented of canonical distributions for a finite thermostat taking into account nonextensive energy. Parameterizing this energy by λ, we derive an explicit form for the distribution functions by regulating λ, and then explore the nontrivial relationship between these functions and energy nonextensivity, as well other system parameters such as system size. A variational entropy function is also derived from these distribution functions..
Advance of Studies on the Structure and Function of Peroxisomes and Glyoxysomes
过氧物酶体和乙醛酸循环体结构与功能研究新进展

Liang Zheng,
梁峥

植物学报 , 1989,
Abstract: This minireview described the recent advance of studies which were done using the intact organelles on the structure and function of peroxisomes and glyoxysomes.
The center functor is fully faithful
Liang Kong,Hao Zheng
Mathematics , 2015,
Abstract: We prove that the notion of Drinfeld center defines a functor from the category of indecomposable rigid k-linear monoidal categories with mor- phisms given by bimodules to that of braided rigid k-linear monoidal categories with morphisms given by monoidal bimodules. Moreover, we apply some ideas in physics to prove that the center functor restricted to indecomposable multi- fusion categories (with additional conditions on the target category) is fully faithful. As byproducts, we provide new proofs to some important known results in fusion categories.
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