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Search Results: 1 - 10 of 562068 matches for " J. C. Wang "
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A Control Strategy for Smoothing Active Power Fluctuation of Wind Farm with Flywheel Energy Storage System Based on Improved Wind Power Prediction Algorithm  [PDF]
J. C. Wang, X. R. Wang
Energy and Power Engineering (EPE) , 2013, DOI: 10.4236/epe.2013.54B075
Abstract: The fluctuation of active power output of wind farm has many negative impacts on large-scale wind power integration into power grid. In this paper, flywheel energy storage system (FESS) was connected to AC side of the doubly-fed induction generator (DFIG) wind farm to realize smooth control of wind power output. Based on improved wind power prediction algorithm and wind speed-power curve modeling, a new smooth control strategy with the FESS was proposed. The requirement of power system dispatch for wind power prediction and flywheel rotor speed limit were taken into consideration during the process. While smoothing the wind power fluctuation, FESS can track short-term planned output of wind farm. It was demonstrated by quantitative analysis of simulation results that the proposed control strategy can smooth the active power fluctuation of wind farm effectively and thereby improve power quality of the power grid.
Evidence for B_s production at the Upsilon(5S) from CLEO and properties of the Upsilon(4S) from BaBar
J. C. Wang
Physics , 2004,
Abstract: BaBar experiment scan around the Upsilon(4S) resonance and measure its mass and full width. They also measure Br(Upsilon(4S) -> B0 B0b) = 0.486 +/- 0.010 +/- 0.009 from 81.7 fb-1 Upsilon(4S) data. CLEO collaboration took about 0.42 fb-1 Upsilon(5S) data. They search for B_s in both inclusive and exclusive modes and find evidence for B_s production at the \Upsilon(5S) and Br(Upsilon(5S) -> B_s^(*) B_s^(*)b) = (21 +/- 3 +/- 9)%.
The BTeV experiment at the Tevatron collider
J. C. Wang
Physics , 2002,
Abstract: The BTeV experiment is designed to study beauty and charm physics at the Fermilab Tevatron collider. The goals are to make an exhaustive search for physics beyond the Standard Model and make precise measurements of the SM parameters. The description of the detector and the physics reach are presented.
The Modulation Effect of Triglyceride Type and Phospholipids Type ω-3 LCPUFA on Mice Gut Microbiota  [PDF]
X. Wang, F. Liu, Y. M. Wang, C. H. Xue, Q. J. Tang
Journal of Biosciences and Medicines (JBM) , 2017, DOI: 10.4236/jbm.2017.59006
Abstract: The evaluation from prospective cohort studies on the dietary ω-3 long-chain polyunsaturated fatty acid (LCPUFA) supplementation and nutritional value is consistent. However, the effect of different types of ω-3 long-chain PUFA (ω-3 LCPUFA) on microbiota in intestine is inconsistent. In this study, the mice were divided into three groups (N, PL, FO), with AIN-93M (N), AIN-93M + Phospholipids type ω-3 LCPUFA (PL) and AIN-93M + triglyceride type ω-3 LCPUFA (FO), respectively. Denaturing Gradient Gel Electrophoresis (DGGE) was used to detect the structure of intestinal microbiota. The data showed that the composition of gut microbiota was changed by treating with the two types of ω-3 LCPUFA. The results revealed that gut microbiota’ enrichment in FO group was decreased while in PL group was increased. The data also showed that the histological morphology of the small intestine in treated mice was improved especially in group PL, which was much more significant and suggested that Phospholipids type ω-3 LCPUFA is beneficial to intestinal health.
Polarization of SN 1987A Revisited
Lifan Wang,J. C. Wheeler
Physics , 1996, DOI: 10.1086/310026
Abstract: The conventional picture for the origin of the polarization of a supernova is based on a model of Thomson or resonance scattering of photons traveling through an aspherical supernova atmosphere. Positive detection of intrinsic polarization in SN 1987A is then interpretated as evidence of an asymmetrical supernova atmosphere. We show here a different view based on the scattering of the supernova light by a dusty circumstellar material (CSM), or the ``light echo'' effect. At a given epoch after the explosion, the observed photons consist of both those propagating directly from the supernova and those scattered by dust particles in the CSM. Polarized light can be produced if the distribution of the dust particles is aspherical. The model can reproduce both the time evolution of the observed broad band polarization of SN 1987A and major features of the polarization spectra. It is also successful in providing a natural model for the early infrared light curve, in particular the observed 30 day delay of the IR maximum compared to the maximum of the bolometric light curve.
Detecting groups of similar components in complex networks
J. Wang,C. -H. Lai
Physics , 2008, DOI: 10.1088/1367-2630/10/12/123023
Abstract: We study how to detect groups in a complex network each of which consists of component nodes sharing a similar connection pattern. Based on the mixture models and the exploratory analysis set up by Newman and Leicht (Newman and Leicht 2007 {\it Proc. Natl. Acad. Sci. USA} {\bf 104} 9564), we develop an algorithm that is applicable to a network with any degree distribution. The partition of a network suggested by this algorithm also applies to its complementary network. In general, groups of similar components are not necessarily identical with the communities in a community network; thus partitioning a network into groups of similar components provides additional information of the network structure. The proposed algorithm can also be used for community detection when the groups and the communities overlap. By introducing a tunable parameter that controls the involved effects of the heterogeneity, we can also investigate conveniently how the group structure can be coupled with the heterogeneity characteristics. In particular, an interesting example shows a group partition can evolve into a community partition in some situations when the involved heterogeneity effects are tuned. The extension of this algorithm to weighted networks is discussed as well.
Intrinsic phonon effects on analog quantum simulators with ultracold trapped ions
C. -C. Joseph Wang,J. K. Freericks
Physics , 2011, DOI: 10.1103/PhysRevA.86.032329
Abstract: Linear Paul traps have been used recently to simulate the transverse field Ising model with long-range spin-spin couplings. We study the intrinsic effects of phonon creation (from the initial phonon ground state) on the spin-state probability and spin entanglement for such quantum spin simulators. While it has often been assumed that phonon effects are benign because they play no role in the pure Ising model, they can play a significant role when a transverse field is added to the model. We use a many-body factorization of the quantum time-evolution operator of the system, adiabatic perturbation theory and exact numerical integration of the Schr\"odinger equation in a truncated spin-phonon Hilbert space followed by a tracing out of the phonon degrees of freedom to study this problem. We find that moderate phonon creation often makes the probabilities of different spin states behave differently from the static spin Hamiltonian. In circumstances in which phonon creation is minor, the spin dynamics state probabilities converge to the static spin Hamiltonian prediction at the cost of reducing the spin entanglement. We show how phonon creation can severely impede the observation of kink transitions in frustrated spin systems when the number of ions increases. Many of our results also have implications for quantum simulation in a Penning trap.
Coded Single-Tone Signaling and Its Application to Resource Coordination and Interference Management in Femtocell Networks
C. Yang,C. Jiang,J. Wang
Mathematics , 2011,
Abstract: Resource coordination and interference management is the key to achieving the benefits of femtocell networks. Over-the-air signaling is one of the most effective means for distributed dynamic resource coordination and interference management. However, the design of this type of signal is challenging. In this paper, we address the challenges and propose an effective solution, referred to as coded single-tone signaling (STS). The proposed coded STS scheme possesses certain highly desirable properties, such as no dedicated resource requirement (no overhead), no near-and-far effect, no inter-signal interference (no multi-user interference), low peak-to-average power ratio (deep coverage). In addition, the proposed coded STS can fully exploit frequency diversity and provides a means for high quality wideband channel estimation. The coded STS design is demonstrated through a concrete numerical example. Performance of the proposed coded STS and its effect on cochannel traffic channels are evaluated through simulations.
The effect of hydrodynamics on nitrogen accumulation and physiological characteristics of Vallisneria spiraslis L in eutrophicated water
P Wang, C Wang, X Wang, J Hou, S Zhang
African Journal of Biotechnology , 2008,
Abstract: Natural water hydrodynamic conditions play an important role in the nutrients transport among water, soil and plants. Meanwhile, aquatic plants affect the water flow characters and pollutants purification capability. However, there are limited studies on how these conditions affects the nutrient uptake and physiological response of aquatic plants. From May 18 to June 28, 2007, a kind of submerged plant, Vallisneria spiraslis L, was selected to observe the difference in nitrogen accumulation and antioxidant system and their changes in both shoots and roots of the plant between hydrodynamic condition (D flume) and relative hydrostatic condition (S flume). The results showed that under hydrodynamic conditions, the nitrogen accumulation in shoots increased rapidly, and maintained a higher level of nitrogen accumulation than that of the hydrostatic flume. Furthermore, in the initial stage of the experiment, the total chlorophyll of V. spiraslis in the D flume decreased because of the hydrodynamic stress inhibition, while Chl a and b appeared to be a little synthesized in the S flume. Moreover, rapid induction in antioxidant enzyme activity occurred in shoots of the plant in the D flume, and the activity levels of POD and GSH were significantly higher than those of the S flume.
The q-nonadditivity of nonextensive statistics is not a true physical property
Q. A. Wang,C. J. Ou,J. C. Chen
Physics , 2009,
Abstract: This is a note showing that, contrary to our lasting belief, the nonadditivity X(1+2)=X(1)+X(2)+\alpha X(1)X(2) is not a true physical property. \alpha in this expression cannot be unique for a given system. It unavoidably depends on how one mathematically divides the system and cannot be used to characterize nonadditivity. As a matter of fact, its use is mathematically inconsistent.
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