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Search Results: 1 - 10 of 32961 matches for " Zhiyuan Huang "
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Flame instability analysis of diethyl ether-air premixed mixtures at elevated pressures
Ni Zhang,YaGe Di,ZuoHua Huang,ZhiYuan Zhang
Chinese Science Bulletin , 2010, DOI: 10.1007/s11434-009-0501-z
Abstract: Combustion characteristics of premixed diethyl ether-air mixtures were studied at different equivalence ratios and elevated initial pressures using schlieren photography and spherically propagating flame. Laminar burning velocities, Markstein number and critical radii at onset of cellular structure were obtained. The results show that an increase in initial pressure leads to a decrease in the unstretched laminar burning velocities. Laminar burning velocities give their peak values at the equivalence ratio of 1.1. Markstein number decrease with the increase of initial pressure and equivalence ratio, indicating that the instability of flame front is increased with the increase of initial pressure and equivalence ratio. The critical radii at onset of cellular flame structure are decreased with the increase of initial pressure.
Flame instability analysis of diethyl ether-air premixed mixtures at elevated pressures


科学通报(英文版) , 2010,
Abstract: Combustion characteristics of premixed diethyl ether-air mixtures were studied at different equivalence ratios and elevated initial pressures using schlieren photography and spherically propagating flame. Laminar burning velocities, Markstein number and critical radii at onset of cellular structure were obtained. The results show that an increase in initial pressure leads to a decrease in the unstretched laminar burning velocities. Laminar burning velocities give their peak values at the equivalence ratio o...
Construction and analysis of a high-density genetic linkage map in cabbage (Brassica oleracea L. var. capitata)
Wang Wanxing,Huang Shunmou,Liu Yumei,Fang Zhiyuan
BMC Genomics , 2012, DOI: 10.1186/1471-2164-13-523
Abstract: Background Brassica oleracea encompass a family of vegetables and cabbage that are among the most widely cultivated crops. In 2009, the B. oleracea Genome Sequencing Project was launched using next generation sequencing technology. None of the available maps were detailed enough to anchor the sequence scaffolds for the Genome Sequencing Project. This report describes the development of a large number of SSR and SNP markers from the whole genome shotgun sequence data of B. oleracea, and the construction of a high-density genetic linkage map using a double haploid mapping population. Results The B. oleracea high-density genetic linkage map that was constructed includes 1,227 markers in nine linkage groups spanning a total of 1197.9 cM with an average of 0.98 cM between adjacent loci. There were 602 SSR markers and 625 SNP markers on the map. The chromosome with the highest number of markers (186) was C03, and the chromosome with smallest number of markers (99) was C09. Conclusions This first high-density map allowed the assembled scaffolds to be anchored to pseudochromosomes. The map also provides useful information for positional cloning, molecular breeding, and integration of information of genes and traits in B. oleracea. All the markers on the map will be transferable and could be used for the construction of other genetic maps.
Chaotic Vibration Analysis of the Bottom Rotating Drill String
Qilong Xue,Ruihe Wang,Feng Sun,Zhiyuan Huang
Shock and Vibration , 2014, DOI: 10.1155/2014/429164
Abstract: Drill string vibration is a widely studied topic. This paper developed a real-time measurement system near the drilling bit and extracted the lateral vibration, longitudinal vibration time series of bottom rotating drill string. In order to reconstruct the phase space, we estimated the delay time with mutual information and calculated the embedding dimension through Cao’s method. Finally, the chaotic characterization of the system is analyzed by calculating the correlation dimension and the largest Lyapunov exponent. The results show that such system can exhibit positive finite-time Lyapunov exponents and a clear convergence toward the correlation dimension, which is a strong indicator for the chaotic behavior of the system. It is expected that the new dynamics found in this paper could be of potential implication to the control methods of the drill string vibration. 1. Introduction In oil and gas drilling engineering, the well is created by drilling a hole 5 to 50 inches (127.0?mm to 914.4?mm) in diameter into the earth with a drilling rig that rotates a drill string with a bit attached. In the process, severe drill string vibration is a major contributor to downhole tool failure. It may also cause hole damage and increase the need for more frequent rig repair. Typically, the drilling string vibration can be divided into three types or modes: lateral, longitudinal, and torsional. The destructive nature of each type of vibration is different. Lateral and longitudinal vibrations of the drill string have been undertaken extensive research since it proposed from mid-1960s, The main reason that caused the fatigue failure of the bottomhole assembly (BHA) [2] was considered to be the vibration of the drill string. Many studies of the drill string focused on the determination of natural frequencies [3, 4], bending stress calculation [5, 6], stability analysis [7], lateral displacement prediction [8], and so forth. Spanos et al. [9] established the finite element model of drill string lateral vibration and analyzed nonlinear random vibration. Chunjie and Tie [10] obtained the natural frequency of drill string longitudinal vibration from a finite element model. Vibrations of all three types (lateral, longitudinal, and torsional) may occur during rotary drilling and are coupled. Single vibration model cannot well describe the dynamics of BHA; furthermore, to establish a precise bottom hole kinetic theory model is difficult to achieve because of the underground complex situation. Additionally, the process of drill bit break rocks is a nonlinear process which is
A Multipath Routing Algorithm Based on Traffic Prediction in Wireless Mesh Networks  [PDF]
Zhiyuan LI, Ruchuan WANG
Communications and Network (CN) , 2009, DOI: 10.4236/cn.2009.12013
Abstract: The technology of QoS routing has become a great challenge in Wireless Mesh Networks (WMNs). There exist a lot of literatures on QoS routing in WMNs, but the current algorithms have some deficiencies, such as high complexity, poor scalability and flexibility. To solve the problems above, a multipath routing algorithm based on traffic prediction (MRATP) is proposed in WMNs. MRATP consists of three modules including an algo-rithm on multipath routing built, a congestion discovery mechanism based on wavelet-neural network and a load balancing algorithm via multipath. Simulation results show that MRATP has some characteristics, such as better scalability, flexibility and robustness. Compared with the current algorithms, MRATP has higher success ratio, lower end to end delay and overhead. So MRATP can guarantee the end to end QoS of WMNs.
Application of Integrated Reorganization of Science Specimen Data Using Kettle  [PDF]
Zhiyuan Wu, Yang Mei
Intelligent Information Management (IIM) , 2019, DOI: 10.4236/iim.2019.111002
Abstract: Standards and specifications are the premise of integrated reorganization of science specimen data, and data integration is the core of the reorganization. ETL [1] which is the abbreviation of extract, transform, and load [2], is very suitable for data integration. Kettle is a kind of ETL software. In this paper, it has been introduced into the integrated reorganization of science specimen data. Multi-source and heterogeneous specimen data are integrated using kettle, and good results have been achieved. It proved the effectiveness of kettle in the integrated reorganization of science specimen data. The application has practical significance, and the method can be referenced when reorganizing other resource data.
Requirement of Mouse BCCIP for Neural Development and Progenitor Proliferation
Yi-Yuan Huang, Huimei Lu, Stephany Liu, Roberto Droz-Rosario, Zhiyuan Shen
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0030638
Abstract: Multiple DNA repair pathways are involved in the orderly development of neural systems at distinct stages. The homologous recombination (HR) pathway is required to resolve stalled replication forks and critical for the proliferation of progenitor cells during neural development. BCCIP is a BRCA2 and CDKN1A interacting protein implicated in HR and inhibition of DNA replication stress. In this study, we determined the role of BCCIP in neural development using a conditional BCCIP knock-down mouse model. BCCIP deficiency impaired embryonic and postnatal neural development, causing severe ataxia, cerebral and cerebellar defects, and microcephaly. These development defects are associated with spontaneous DNA damage and subsequent cell death in the proliferative cell populations of the neural system during embryogenesis. With in vitro neural spheroid cultures, BCCIP deficiency impaired neural progenitor's self-renewal capability, and spontaneously activated p53. These data suggest that BCCIP and its anti-replication stress functions are essential for normal neural development by maintaining an orderly proliferation of neural progenitors.
Different cDNA microarray patterns of gene expression reflecting changes during metastatic progression in adenoid cystic carcinoma
Dan Huang, Wantao Chen, Ronggen He, Fan Yu, Zhiyuan Zhang, Weiliu Qiu
World Journal of Surgical Oncology , 2003, DOI: 10.1186/1477-7819-1-28
Abstract: Salivary adenoid cystic carcinoma cell line and its high metastases adenoid cystic carcinoma clone were used as model systems to reveal the gene expression alteration related to metastasis mechanism by cDNA microarray analysis. The correlation of metastatic phenotypic changes and expression levels of 4 selected genes (encoding CD98, L6, RPL29, and TSH) were further validated by using RT-PCR analysis of human tumor specimens from primary adenoid cystic carcinoma and corresponding metastasis lymph nodes.Of the 7,675 clones of known genes and expressed sequence tags (ESTs) that were analyzed, 30 showed significantly different (minimum 3 fold) expression levels in two cell lines. Out of 30 genes found differentially expressed, 18 were up regulated (with ratio more than 3) and 12 down regulated (with ratio less than 1/3).Some of these genes are known to be involved in human tumor antigen, immune surveillance, adhesion, cell signaling pathway and growth control. It is suggested that the microarray in combination with a relevant analysis facilitates rapid and simultaneous identification of multiple genes of interests and in this study it provided a profound clue to screen candidate targets for early diagnosis and intervention.Adenoid cystic carcinoma (ACC) of the salivary gland is characterized by a prolonged clinical course, high rate of local recurrence and the delayed onset of distant hematogenous metastases. Late distant metastases and local recurrences are responsible for a rather low long-term survival rate and poor treatment results [1]. However, the molecular mechanism behind the metastasis development is poorly understood, largely because the tumor metastasis is a complex process involving several distinct steps such as escape from primary tumor, dissemination through the circulation, lodgment in small vessels at distinct sites, penetration of the vessel wall and growth in the new site as a secondary tumor [2]. A possible breakthrough in understanding of tumor met
Concentration and seasonal variation of 10Be in surface aerosols of Lhasa, Tibet
Jie Huang,ShiChang Kang,ChengDe Shen,ZhiYuan Cong,KeXin Liu,Wei Wang,LiChao Liu
Chinese Science Bulletin , 2010, DOI: 10.1007/s11434-010-3233-1
Abstract: Thirty samples of total suspended particles were collected at a site in western part of Lhasa, Tibet from August 2006 to July 2007. The 10Be concentrations were determined by Accelerator Mass Spectrometer (AMS). Analysis of correlation between 10Be concentrations and meteorological factors revealed that the wet scavenging has little effect on 10Be. 10Be can be used as a proxy of transport processes of the upper atmosphere over the Tibetan Plateau. Analysis of correlation between 10Be concentrations and NCEP reanalysis data demonstrated that higher 10Be concentrations in spring were probably caused by the atmosphere exchange from stratosphere to troposphere during February to June. Lower 10Be concentrations during August to September were consistent with the synchronous lower O3 values, suggestive of both 10Be and O3 were probably influenced by the atmosphere exchange from troposphere to stratosphere.
Numerical study on combustion of diluted methanol-air premixed mixtures
JianJun Zheng,ZhiYuan Zhang,ZuoHua Huang,ErJiang Hu,ChengLong Tang,JinHua Wang
Chinese Science Bulletin , 2010, DOI: 10.1007/s11434-009-0709-y
Abstract: The effect of nitrogen dilution on the premixed combustion characteristics and flame structure of laminar premixed methanol-air-nitrogen mixtures are analyzed numerically based on an extended methanol oxidation mechanism. The laminar burning velocities, the mass burning fluxes, the adiabatic flame temperature, the global activation temperature, the Zeldovich number, the effective Lewis number and the laminar flame structure of the methanol-air-nitrogen mixtures are obtained under different nitrogen dilution ratios. Comparison between experiments and numerical simulations show that the extended methanol oxidation mechanism can well reproduce the laminar burning velocities for lean and near stoichiometric methanol-air-nitrogen mixtures. The laminar burning velocities and the mass burning fluxes decrease with the increase of nitrogen dilution ratio and the effect is more obvious for the lean mixture. The effective Lewis number of the mixture increases with the increase of nitrogen dilution ratio, and the diffusive-thermal instability of the flame front is decreased by the nitrogen addition. Nitrogen addition can suppress the hydrodynamic instability of methanol-air-nitrogen flames. The decrease of the mole fraction of OH and H is mainly responsible for the suppressed effect of nitrogen diluent on the chemical reaction in the methanol-air-nitrogen laminar premixed flames, and the NO x and formaldehyde emissions are decreased by the nitrogen addition.
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