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Search Results: 1 - 10 of 28918 matches for " Junfeng Sun "
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Experimental Study on the Cyclic Ampacity and Its Factor of 10 kV XLPE Cable  [PDF]
Xiaoliang Zhuang, Haiqing Niu, Junfeng Wang, Yong You, Guanghui Sun
Energy and Power Engineering (EPE) , 2013, DOI: 10.4236/epe.2013.54B231
Abstract:

The load varies periodically, but the peak current of power cable is controlled by its continuous ampacity in China, resulting in the highest conductor temperature is much lower than90, the permitted long-term working temperature of XLPE. If the cable load is controlled by its cyclic ampacity, the cable transmission capacity could be used sufficiently. To study the 10 kV XLPE cable cyclic ampacity and its factor, a three-core cable cyclic ampacity calculation software is developed and the cyclic ampacity experiments of direct buried cable are undertaken in this paper. Experiments and research shows that the software calculation is correct and the circuit numbers and daily load factor have an important impact on the cyclic ampacity factor. The cyclic ampacity factor of 0.7 daily load factor is 1.20, which means the peak current is the 1.2 times of continuous ampacity. If the continuous ampacity is instead by the cyclic ampacity to control the cable load, the transmission capacity of the cable can be improved greatly without additional investment.

Accumulative Effect of Soil Organic Carbon and Nitrogen in Water-Stable Aggregates and Soil Stability Characteristics of Robinia pseudoacacia Plantation in the Loess Hilly-Gully Region  [PDF]
Jiao Sun, Junfeng Li, Gaihe Yang, Wenfang Hao
Open Journal of Soil Science (OJSS) , 2016, DOI: 10.4236/ojss.2016.612019
Abstract: Soil water-stable aggregates (WSAs) are the basic unit of soil constitution and can contribute to remaining the stable soil constitution. The objective of this study was to clarify the distribution and stability of WSAs and the soil organic carbon (SOC), the total nitrogen (TN), and the total phosphorus (TP) concentrations in 0 - 20 cm and 20 - 40 cm soil layers under the different ages of Robinia pseudoacacia plantations. The 20, 25, 40, and 50 years-old Robinia pseudoacacia plantations were selected. Stepwise regression analysis showed that >5 mm and 1 - 2 mm WSAs, SOC concentration in 2 - 5 mm WSAs, and TN and TP concentrations in < 0.25 mm WSAs were dominant independent variables affecting aggregate stability and that SOC in 0.25 - 0.5 mm WSAs, TN in <0.25 mm and 1 - 2 mm WSAs and TP in 2 - 5 mm WSAs were dominant independent variables affecting SOC, TN, and TP concentrations in bulk soils.
Why Are Clinicians Not Embracing the Results from Pivotal Clinical Trials in Severe Sepsis? A Bayesian Analysis
Andre C. Kalil, Junfeng Sun
PLOS ONE , 2008, DOI: 10.1371/journal.pone.0002291
Abstract: Background Five pivotal clinical trials (Intensive Insulin Therapy; Recombinant Human Activated Protein C [rhAPC]; Low-Tidal Volume; Low-Dose Steroid; Early Goal-Directed Therapy [EGDT]) demonstrated mortality reduction in patients with severe sepsis and expert guidelines have recommended them to clinical practice. Yet, the adoption of these therapies remains low among clinicians. Objectives We selected these five trials and asked: Question 1-What is the current probability that the new therapy is not better than the standard of care in my patient with severe sepsis? Question 2-What is the current probability of reducing the relative risk of death (RRR) of my patient with severe sepsis by meaningful clinical thresholds (RRR >15%; >20%; >25%)? Methods Bayesian methodologies were applied to this study. Odds ratio (OR) was considered for Question 1, and RRR was used for Question 2. We constructed prior distributions (enthusiastic; mild, moderate, and severe skeptic) based on various effective sample sizes of other relevant clinical trials (unfavorable evidence). Posterior distributions were calculated by combining the prior distributions and the data from pivotal trials (favorable evidence). Main Findings Answer 1-The analysis based on mild skeptic prior shows beneficial results with the Intensive Insulin, rhAPC, and Low-Tidal Volume trials, but not with the Low-Dose Steroid and EGDT trials. All trials' results become unacceptable by the analyses using moderate or severe skeptic priors. Answer 2-If we aim for a RRR>15%, the mild skeptic analysis shows that the current probability of reducing death by this clinical threshold is 88% for the Intensive Insulin, 62–65% for the Low-Tidal Volume, rhAPC, EGDT trials, and 17% for the Low-Dose Steroid trial. The moderate and severe skeptic analyses show no clinically meaningful reduction in the risk of death for all trials. If we aim for a RRR >20% or >25%, all probabilities of benefits become lower independent of the degree of skepticism. Conclusions Our clinical threshold analysis offers a new bedside tool to be directly applied to the care of patients with severe sepsis. Our results demonstrate that the strength of evidence (statistical and clinical) is weak for all trials, particularly for the Low-Dose Steroid and EGDT trials. It is essential to replicate the results of each of these five clinical trials in confirmatory studies if we want to provide patient care based on scientifically sound evidence.
Inferring Functional Neural Connectivity with Phase Synchronization Analysis: A Review of Methodology
Junfeng Sun,Zhijun Li,Shanbao Tong
Computational and Mathematical Methods in Medicine , 2012, DOI: 10.1155/2012/239210
Abstract: Functional neural connectivity is drawing increasing attention in neuroscience research. To infer functional connectivity from observed neural signals, various methods have been proposed. Among them, phase synchronization analysis is an important and effective one which examines the relationship of instantaneous phase between neural signals but neglecting the influence of their amplitudes. In this paper, we review the advances in methodologies of phase synchronization analysis. In particular, we discuss the definitions of instantaneous phase, the indexes of phase synchronization and their significance test, the issues that may affect the detection of phase synchronization and the extensions of phase synchronization analysis. In practice, phase synchronization analysis may be affected by observational noise, insufficient samples of the signals, volume conduction, and reference in recording neural signals. We make comments and suggestions on these issues so as to better apply phase synchronization analysis to inferring functional connectivity from neural signals.
Electrostatic-Assembly-Driven Formation of Supramolecular Rhombus Microparticles and Their Application for Fluorescent Nucleic Acid Detection
Hailong Li,Junfeng Zhai,Xuping Sun
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0018958
Abstract: In this paper, we report on the large-scale formation of supramolecular rhombus microparticles (SRMs) driven by electrostatic assembly, carried out by direct mixing of an aqueous HAuCl4 solution and an ethanol solution of 4,4′-bipyridine at room temperature. We further demonstrate their use as an effective fluorescent sensing platform for nucleic acid detection with a high selectivity down to single-base mismatch. The general concept used in this approach is based on adsorption of the fluorescently labeled single-stranded DNA (ssDNA) probe by SRM, which is accompanied by substantial fluorescence quenching. In the following assay, specific hybridization with its target to form double-stranded DNA (dsDNA) results in desorption of ssDNA from SRM surface and subsequent fluorescence recovery.
Analysis of D_s-> phi pi beyond naive factorization
Haijun Gong,Junfeng Sun,Dongsheng Du
Physics , 2001,
Abstract: We analyze the decay $D_s\to \phi \pi$ with QCD factorization in the heavy quark limit. The nonfactorizable contributions, including hard spectator contribution are discussed and numerical results are presented. Our predictions on the branching ratio of the decay are in agreement with the experiment. We also use a pure phenomenological method to estimate the branching ratio for $D_s\to \phi\pi$ with the existed $D^0\to K^{*}\pi$ data.
Strategy Research of the Innovating-Style City of Xi’an Low Carbon-Based View—Main Body Innovation  [PDF]
Junfeng Liu
Open Journal of Social Sciences (JSS) , 2015, DOI: 10.4236/jss.2015.38012
Abstract: Beginning with the conception of the innovating-style city, path selection of the innovating-style city of Xi’an based on low-carbon view is introduced and one of the strategies makes it true—main body innovation, including enterprise innovation strategy, management innovation strategy and talent innovation strategy.
Characteristics of a 0.1μm SOI Grooved Gate pMOSFET
Shao Hongxu,Sun Baogang,Wu Junfeng,Zhong Xinghua
半导体学报 , 2005,
Abstract: A 0.1μm SOI grooved gate pMOSFET with 5.6nm gate oxide is fabricated and demonstrated.The groove depth is 180nm.The transfer characteristics and the output characteristics are shown.At Vds=-1.5V,the drain saturation current is 380μA and the off-state leakage current is 1.9nA;the sub-threshold slope is 115mV/dec at Vds=-0.1V and DIBL factor is 70.7mV/V.The electrical characteristic comparison between the 0.1μm SOI grooved-gate pMOSFET and the 0.1μm bulk grooved gate one with the same process demonstrates that a 0.1μm SOI grooved gate pMOSFET has better characteristics in current-driving capability and sub-threshold slope.
Study of $B_{c}^{-}$ ${\to}$ $J/{\psi}{\pi}^{-}$, ${\eta}_{c}{\pi}^{-}$ Decays with QCD Factorization
Sun, Junfeng;Xue, Guifeng;Yang, Yueling;Lu, Gongru;Du, Dongsheng
High Energy Physics - Phenomenology , 2007, DOI: 10.1103/PhysRevD.77.074013
Abstract: The $B_{c}$ ${\to}$ $J/{\psi}{\pi}$, ${\eta}_{c}{\pi}$ decays are studied in the scheme of the QCD factorization approach. The branching ratios are calculated with the asymptotic distribution amplitude of the pion. The charm quark mass effect is considered. We find that the mass effect on the branching ratios is small.
Asymptotically pivotal statistic for surrogate testing with extended hypothesis
Xiaodong Luo,Jie Zhang,Junfeng Sun,Michael Small,Irene Moroz
Physics , 2007,
Abstract: The method of surrogate data provides a framework for testing observed data against a hierarchy of alternative hypotheses. The aim of applying this method is to exclude the possibility that the data are consistent with simple linear explanations before seeking complex nonlinear causes. However, in recent time the method has attracted considerable criticism, largely as a result of ambiguity about the formation of the underlying null hypotheses, or about the power of the chosen statistic. In this communication we show that by employing a special family of ranks statistics these problems can be avoided and the method of surrogate data placed of a firm statistical foundation.
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