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Search Results: 1 - 10 of 120235 matches for " Pengcheng Wang "
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Optimization Design of Fracturing Parameters for Coalbed Methane Wells in Dafosi Mine Field  [PDF]
Chuantao Wang, Dongmin Ma, Qian He, Qian Li, Pengcheng Liu
Journal of Power and Energy Engineering (JPEE) , 2017, DOI: 10.4236/jpee.2017.59010
Abstract: Being controlled by the gas content of the reservoir, the productivity of CBM well is also mainly determined by its engineering quality and the physical property of the reservoir. In Dafosi mine field, 22 vertical wells from the “26 + 1” CBM wells project that was implemented since 2014 showed great difference in productivity after fracturing construction. With the consistent geological condition of coal reservoirs, fracturing construction parameters are suggested as the priority factor that controlling the well productivity. In this study, being combined with historical production and geological data, an optimized designation of fracturing construction parameters was established based on systematically comparative analysis of construction parameters such as discharge, the total volume of fracturing fluid, the quality of sand, sand ratio, which provides engineering basis for further fracturing construction of CBM wells.
Attention Points of Research and Education in TCMP across Taiwan Strait and Recommendations for Future Research and Development of TCM in China Mainland Especially Fujian and Taiwan  [PDF]
Shengyan Xi, Yanhui Wang, Yaochen Chuang, Linchao Qian, Xiaoyan Qian, Pengcheng Li, Dawei Lu
Chinese Medicine (CM) , 2013, DOI: 10.4236/cm.2013.42008

Objective: China mainland and Taiwan are separated by the Taiwan Strait, but their land edges are close to each other, blood relationship is very compact, and the origin is profound, the communication of Traditional Chinese Medicine (TCM) between China mainland especially Fujian and Taiwan district is more and more frequent. From the actuality and situation of traditional Chinese medicine and pharmacy (TCMP), the objective of this study was to briefly expound the points to which attention should be attached urgently in education, research and development of TCM between China mainland especially between Fujian and Taiwan, and be provide with several resolving threads and recommenddations to aim directly at the attention points, and wish it can offer some assistance to the development and generalization of the cross-Strait TCMP. Methods: The China Statistical Yearbook of Chinese Medicine (1987-2010), the Yearbook of Public Health of Taiwan (2009), the full-text data base of China National Knowledge Infrastructure (CNKI) (1993-2009), provides information on research and education in TCMP acrossTaiwan Straitin the last 10 years. The methods of analysis and comparison are applied in this study to show the TCMP situation betweenTaiwanandChinamainland. Result: Due to the differences in history, district, policy and legislation, the TCMP’s industry and trade, education, research and exploitation, standard and so on, have lots of differences betweenTaiwanandChinamainland, and many barriers are produced in the communication and cooperation of cross-Strait

Expression of Peptidylarginine Deiminase Type 4 in Ovarian Tumors
Lin Wang, Xiaotian Chang, Guangying Yuan, Yan Zhao, Pengcheng Wang
International Journal of Biological Sciences , 2010,
Abstract: Peptidylarginine deiminase type 4 (PADI4) converts arginine residues into citrulline. The current study focused on the expression of PADI4 in various subtypes of ovary cancers, and this study investigated the effects of estrogen on PADI4 expression in SKOV-3 cells that originated from ovary tumors. We utilized immunohistochemistry, real-time PCR and western blotting to analyze the expression of PADI4 in the tumor tissues and in the cell line that were cultured with estrodial-17β. PADI4 was detected in serious cystadenocarcinoma (n=39, positivity=100%), clear cell cancer (n=7, positivity= 100%), mucinous cystadenocarcinoma (n=6, positivity=100%), dysgerminoma (n=6, positivity=100%), squamous cell tumor (n=6, positivity=100%), sibnet-ring cell carcinoma (n=6, positivity=100%), endodermal sinus tumor (n=6, positivity=100%), germ cell tumors (n=6, positivity=100%) and immature teratoma (n=6, positivity=100%). However, PADI4 was either not detected or detected at low levels in granulosa cell tumor (n=6), malignant thecoma (n=6), ovarian cystadenoma (n=5) and normal ovarian tissue (n=11). For serious cystadenocarcinoma, all of the samples with high PADI4 expression belonged to the T1 and T2 stages of pTMN, whereas all of the samples that exhibited weak or moderate PADI4 expression belonged to the T3 and T4 stages. PADI4 was evenly distributed in the cytoplasm of tumor cells of serious cystadenocarcinoma that were classified as being grade II and III by histopathological scoring. However, PADI4 showed granular cellular distribution in the tumor tissues that were isolated from grade I cystadenocarcinoma. In addition, the PADI4 level was positively related with the ages of the patients that presented with serious adenocarcinoma (p=0.029). Real-time PCR and western blot analyses confirmed that PADI4 was expressed at higher levels in ovarian adenocarcinoma (n=8) compared to ovarian cystadenoma (n=5) (p< 0.05). The study also detected an increased level of PADI4 in SKOV-3 cells that were incubated with estrodial-17β in the range of 10-12 to 10-4M. The results suggest an important role for PADI4 in the tumorigenesis of ovary cancers that are under the regulation of estrogen.
Diagnosis of Premature Senescence of Cotton Using SPAD Value  [PDF]
Pengcheng Li, Helin Dong, Aizhong Liu, Jingran Liu, Miao Sun, Guoping Wang, Siping Zhang, Yabing Li, Shuchun Mao
Agricultural Sciences (AS) , 2014, DOI: 10.4236/as.2014.511107
Abstract: Field experiments were conducted in 2011 on an experimental farm at the Cotton Research Insti-tute, Chinese Academy of Agricultural Sciences, Anyang, China. We conducted experiments with a “SPAD-502” meter to quickly measure the relative value of chlorophyll content in the leaf blades of field cotton. Our goal was to seek a suitable leaf on a cotton plant to diagnose senescence status of crop plants at later stages of growth. We began by studying the dynamic change rule of the dis-tal-most four leaves of the cotton plant during the entire growth period with two early-maturing cultivars (CCRI 36, CCRI 50) and two mid-maturing cultivars (CCRI 41, SCRC 28). We also examined the effect of different nitrogen and potassium fertilizer rates on SPAD values of the leaves of SCRC 28. Our results suggest that SPAD values of the 1st distal stem leaves from two early cultivars can act as good indicators of senescence status in the plants, if they are measured between 10 d before the boll-opening stage and 10 d after boll opening stage. Differences of SPAD values of the 3rd distal stem leaves of two mid-maturing cultivars measured between about 15 d before the boll opening stage and 15 d after the boll opening stage can also be used to measure senescence status in these cotton cultivars. The conclusion can be used for cotton producer to manage N fertilizer better at later growth stage.
The Mean Value Theorem and Uncertainty Principle for theSub-Laplacian on the Quaternionic Heisenberg Group

WANG Jialin,NIU Pengcheng,

系统科学与数学 , 2009,
Abstract: In this paper, the mean value theorem for the sub-Laplacianon the quaternionic Heisenberg group is given. As an application, the Hardy inequality and the uncertainty principle are established.
Altered Immunity in Crowded Locust Reduced Fungal (Metarhizium anisopliae) Pathogenesis
Yundan Wang,Pengcheng Yang,Feng Cui,Le Kang
PLOS Pathogens , 2013, DOI: 10.1371/journal.ppat.1003102
Abstract: The stress of living conditions, similar to infections, alters animal immunity. High population density is empirically considered to induce prophylactic immunity to reduce the infection risk, which was challenged by a model of low connectivity between infectious and susceptible individuals in crowded animals. The migratory locust, which exhibits polyphenism through gregarious and solitary phases in response to population density and displays different resistance to fungal biopesticide (Metarhizium anisopliae), was used to observe the prophylactic immunity of crowded animals. We applied an RNA-sequencing assay to investigate differential expression in fat body samples of gregarious and solitary locusts before and after infection. Solitary locusts devoted at least twice the number of genes for combating M. anisopliae infection than gregarious locusts. The transcription of immune molecules such as pattern recognition proteins, protease inhibitors, and anti-oxidation proteins, was increased in prophylactic immunity of gregarious locusts. The differentially expressed transcripts reducing gregarious locust susceptibility to M. anisopliae were confirmed at the transcriptional and translational level. Further investigation revealed that locust GNBP3 was susceptible to proteolysis while GNBP1, induced by M. anisopliae infection, resisted proteolysis. Silencing of gnbp3 by RNAi significantly shortened the life span of gregarious locusts but not solitary locusts. By contrast, gnbp1 silencing did not affect the life span of both gregarious and solitary locusts after M. anisopliae infection. Thus, the GNBP3-dependent immune responses were involved in the phenotypic resistance of gregarious locusts to fungal infection, but were redundant in solitary locusts. Our results indicated that gregarious locusts prophylactically activated upstream modulators of immune cascades rather than downstream effectors, preferring to quarantine rather than eliminate pathogens to conserve energy meanwhile increasing the “distance” of infectious and target individuals. Our study has obvious implications for bio-pesticides management of crowded pests, and for understanding disease epidemics and adaptiveness of pathogens.
Time Course Transcriptome Changes in Shewanella algae in Response to Salt Stress
Xiuping Fu, Duochun Wang, Xiling Yin, Pengcheng Du, Biao Kan
PLOS ONE , 2014, DOI: 10.1371/journal.pone.0096001
Abstract: Shewanella algae, which produces tetrodotoxin and exists in various seafoods, can cause human diseases, such as spondylodiscitis and bloody diarrhea. In the present study, we focused on the temporal, dynamic process in salt-stressed S. algae by monitoring the gene transcript levels at different time points after high salt exposure. Transcript changes in amino acid metabolism, carbohydrate metabolism, energy metabolism, membrane transport, regulatory functions, and cellular signaling were found to be important for the high salt response in S. algae. The most common strategies used by bacteria to survive and grow in high salt environments, such as Na+ efflux, K+ uptake, glutamate transport and biosynthesis, and the accumulation of compatible solutes, were also observed in S. algae. In particular, genes involved in peptidoglycan biosynthesis and DNA repair were highly and steadily up-regulated, accompanied by rapid and instantaneous enhancement of the transcription of large- and small-ribosome subunits, which suggested that the structural changes in the cell wall and some stressful responses occurred in S. algae. Furthermore, the transcription of genes involved in the tricarboxylic acid (TCA) cycle and the glycolytic pathway was decreased, whereas the transcription of genes involved in anaerobic respiration was increased. These results, demonstrating the multi-pathway reactions of S. algae in response to salt stress, increase our understanding of the microbial stress response mechanisms.
Analysis on Energy Conversion of Screw Centrifugal Pump in Impeller Domain Based on Profile Lines
Hui Quan,Rennian Li,Qingmiao Su,Wei Han,Pengcheng Wang
Advances in Mechanical Engineering , 2013, DOI: 10.1155/2013/512523
Abstract: In order to study the power capability of impeller and energy conversion mechanism of screw centrifugal pump, the methods of theoretical analysis and numerical simulation by computational fluid dynamics theory (CFD) were adopted, specifically discussing the conditions of internal flow such as velocity, pressure, and concentration. When the medium is sand-water two-phase flow and dividing the rim of the lines and wheel lines of screw centrifugal pump to segments to analyze energy conversion capabilities which along the impeller profile lines with the dynamic head and hydrostatic head changer, the results show that the energy of fluid of the screw centrifugal pump is provided by helical segment, and the helical segment of the front of the impeller has played the role of multilevel increasing energy; the sand-water two phases move at different speeds because the different force field and the impeller propeller and centrifugal effect. As liquid phase is the primary phase, the energy conversion is mainly up to the change of liquid energy, the solid phase flows under the wrapped action of liquid, and solid energy is carried out through liquid indirectly. 1. Introduction As a new kind of impurity pump, screw centrifugal pump combines the advantages of screw pump and centrifugal pump, and the special structure can bring into play their advantages, sufficiently (Figure 1). Comparing with the traditional impurity pump, screw centrifugal pump has a series of strong advantages, such as without clogging, suction performance, adjustment of the performance, and cavitation resistance, and with no load, high efficiency, and high efficiency zone width [1, 2]. Figure 1: Picture of the impeller. Screw centrifugal pump internal flow apparently shows mixed spiral movement because of the unique structure of impeller, comparing with ordinary centrifugal pumps; there is still much room for efficiency improvement for screw centrifugal pump. Screw centrifugal pump is a typical sand-water two-phase flow pump, due to the different density of the solid and liquid phases, resulting in the slip velocity, which does not only affect the hydraulic performance of the pump, but also makes it easy for the solid particles and over-current surface conflicts caused by the wear of the pump flow parts and other problems [3–5]. Therefore, the study of mechanism of energy conversion and the analysis of factors that impact the conversion have a great significance for the improvement of efficiency. It is also the primary problem that optimizes the design methods of established impurity pump and
A Framework of Sparse Online Learning and Its Applications
Dayong Wang,Pengcheng Wu,Peilin Zhao,Steven C. H. Hoi
Computer Science , 2015,
Abstract: The amount of data in our society has been exploding in the era of big data today. In this paper, we address several open challenges of big data stream classification, including high volume, high velocity, high dimensionality, high sparsity, and high class-imbalance. Many existing studies in data mining literature solve data stream classification tasks in a batch learning setting, which suffers from poor efficiency and scalability when dealing with big data. To overcome the limitations, this paper investigates an online learning framework for big data stream classification tasks. Unlike some existing online data stream classification techniques that are often based on first-order online learning, we propose a framework of Sparse Online Classification (SOC) for data stream classification, which includes some state-of-the-art first-order sparse online learning algorithms as special cases and allows us to derive a new effective second-order online learning algorithm for data stream classification. In addition, we also propose a new cost-sensitive sparse online learning algorithm by extending the framework with application to tackle online anomaly detection tasks where class distribution of data could be very imbalanced. We also analyze the theoretical bounds of the proposed method, and finally conduct an extensive set of experiments, in which encouraging results validate the efficacy of the proposed algorithms in comparison to a family of state-of-the-art techniques on a variety of data stream classification tasks.
Sustainable development of urban eco-economic system based on energy theory——a case study of Weihai city, Shandong Province

WANG Pengcheng
,ZHENG Guozhang

- , 2017,
Abstract: 近年来,关于城市复合系统的可持续发展研究一直以来是人文地理学研究的重要领域.但基于能值理论对城市可持续发展能力的定量研究多集中在某一年度或某不连续的几个年度,缺乏对某一地区的持续动态研究,使得研究具有很大偶然性和预见性[1].以2005年~2014年的威海市生态经济系统为研究对象,运用能值理论对其可持续发展能力进行定量分析.从系统能值流10 a的动态变化中发现:1)生态经济系统的能值总量、经济反馈输出能值、不可更新资源能值总体呈现快速增加的态势,可更新资源能值和经济反馈输入能值变化不大;2)环境负载率从2005年的1.21上升到2014年2.11,2008年达到十年中环境负载率的最大值2.18,总体呈现不断上升的趋势;3)ESI的数值在3.5~7.5之间波动,EISD的数值在1~3之间波动,两个指标在数值上总体波动较大,并且总体态势呈现下降的趋势.上述发现表明:1)威海市生态经济系统中的高品质的能值不断流出,虽然整个系统的能值总量在增加但是系统真正获得能值财富在相对减少;2)威海市在社会经济快速发展的同时自然生态系统正在承受着越来越大的环境压力,应该引起重视;3)威海市生态经济系统可持续发展能力一般并且在反复波动中呈现减弱的趋势.
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