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Search Results: 1 - 10 of 104249 matches for " Jingyi Zhang "
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Modification of Even-A Nuclear Mass Formula  [PDF]
Jingyi Zhang
Journal of Applied Mathematics and Physics (JAMP) , 2017, DOI: 10.4236/jamp.2017.511187
Abstract: In this paper we obtain an empirical mass formula of even-A nuclei based on residual proton-neutron interactions. The root-mean-squared deviation (RMSD) from experimental data is at an accuracy of about 150 Kev. While for heavy nuclei, we give another formula that fits the experimental data better (RMSD ≈ 119 Kev). We have successfully described the experimental data of nuclear masses and predicted some unknown masses (like 200Ir not involved in AME2003, the deviation of our predicted masses from the value in AME2012 is only about 82 keV). The predictive power of our formula is more competitive than other mass models.
Canonical Ensemble Model for the Black Hole Quantum Tunneling Radiation
Jingyi Zhang
Physics , 2012, DOI: 10.1088/0256-307X/30/7/070401
Abstract: In this paper, a canonical ensemble model for the black hole quantum tunneling radiation is introduced. With this model the probability distribution function corresponding to the emission shell is calculated. Comparing with this function, the statistical significance of the quantum tunneling radiation spectrum of black holes is investigated. Moreover, by calculating the entropy of the emission shell, a discussion about the mechanism of information flowing out from the black hole is given too.
Charged particles' tunnelling from the Kerr-Newman black hole
Jingyi Zhang,Zheng Zhao
Physics , 2005, DOI: 10.1016/j.physletb.2006.05.059
Abstract: In this letter, Parikh-Wilczek tunnelling framework, which treats Hawking radiation as a tunnelling process, is extended, and the emission rate of a charged particle tunnelling from the Kerr-Newman black hole is calculated. The emission spectrum takes the same functional form as that of uncharged particles and consists with an underlying unitary theory but deviates from the pure thermal spectrum. Moreover, our calculation indicates that the emission process is treated as a reversible process in the Parikh-Wilczek tunnelling framework, and the information conservation is a natural result of the first law of black hole thermodynamics.
Determination of Melamine in Fresh Milk by Electrochemistry with Solid Phase Microextraction at Bismuthyl Chloride Modified Graphite Epoxy Composite Electrode  [PDF]
Yongchun Zhu, Yanjia Zhang, Jingyi Li, Yanli Han, Guobin Dong, Hongbo Zhang
American Journal of Analytical Chemistry (AJAC) , 2011, DOI: 10.4236/ajac.2011.25069
Abstract: Melamine as an important chemical raw material and a harmful additive in foods has attracted many people’s attention. In the present paper, The graphite-epoxy composited solid phase electrode was modified with bismuth layer by cyclic voltammetric deposition of bismuth from Bi(NO3)3 aqueous solution including 0.10 M HNO3, and hydrolyzed into micro bismuthyl chloride on-sites. Melamine in fresh milk was extracted with solid phase micro-extraction on the bismuthyl chloride modified graphite-epoxy composited solid electrode. The adsorption of melamine on bismuthyl chloride particle surfaces follows a Freundlich adsorption model, and results in the decrease of the reduction peak current of bismuth in bismuthyl chloride, and determined by differential pulse voltammetry from fresh milk in a larger concentration range of 10–4 ? 10–12 M with detection limit of 2.5 ? 10–12 M and relative standard deviation of 2.7%. The method is sensitive, convenient and was applied in the detection of melamine in fresh milk with relative deviation of 4.2% in content of 0.45 mg/kg melamine in the fresh milk.
3-(4-Methoxyphenyl)-6,7-dihydro-1H-furo[3,4-c]pyran-4(3H)-one
Jingyi Zhang,Ye An,Yikai Zhang,Guobing Shi
Acta Crystallographica Section E , 2012, DOI: 10.1107/s160053681204723x
Abstract: In the title compound, C14H14O4, the dihedral angle between the hydrofuran and benzene rings is 88.41 (15)°. The hydropyran ring adopts an envelope conformation, with the O-bound methylene C atom as the flap. In the crystal, weak aromatic π–π stacking is observed [centroid–centroid separation = 3.848 (2) ].
Predicting the shock arrival time using 1D-HD solar wind model
Ying Zhang,JingYi Chen,XueShang Feng
Chinese Science Bulletin , 2010, DOI: 10.1007/s11434-009-0610-8
Abstract: A 1D-HD shock propagation model is established to predict the arrival time of interplanetary shocks at 1 AU. Applying this model to 68 solar events during the period of February 1997 to October 2000, it is found that our model could be practically equivalent to the STOA, ISPM and HAFv.2 models in forecasting the shock arrival time. The absolute error in the transit time from our model is not larger than those of the other three models for the same sample events. Also, the prediction test shows that the relative error of our model is 10% for 31% of all events, 30% for 75%, and 50% for 84%, which is comparable to the relative errors of the other models. These results might demonstrate a potential capability of our model in terms of real-time forecasting.
Micro/nanofiber optical sensors
Lei Zhang,Jingyi Lou,Limin Tong
Photonic Sensors , 2011, DOI: 10.1007/s13320-010-0022-z
Abstract: As a low-dimensional optical fiber with diameter close to or below the wavelength of light, optical micro/nanofiber (MNF) offers a number of favorable properties for optical sensing, which have been exploited in a variety of sensing applications, including physical, chemical, and biological sensors. In this paper we review the principles and applications of silica, glass, and polymer optical micro/nanofibers for physical and chemical sensing.
Massive particles' Hawking radiation via tunneling from the G.H Dilaton black hole
Yapeng Hu,Jingyi Zhang,Zheng Zhao
Physics , 2006, DOI: 10.1142/S0217732306020184
Abstract: In the past, Hawking radiation was viewed as a tunneling process and the barrier was just created by the outgoing particle itself. In this paper, Parikh's recent work is extended to the case of massive particles' tunneling. We investigate the behavior of the tunneling massive particles from a particular black hole solution-G.H Dilaton black hole which is obtained from the string theory, and calculate the emission rate at which massive particles tunnel across the event horizon. We obtain that the result is also consistent with an underlying unitary theory. Furthermore, the result takes the same functional form as that of massless particles.
Massive uncharged and charged particles' tunneling from the Horowitz-Strominger Dilaton black hole
Yapeng Hu,Jingyi Zhang,Zheng Zhao
Physics , 2006, DOI: 10.1142/S0218271807010468
Abstract: Originally, Parikh and Wilczek's work is only suitable for the massless particles' tunneling. But their work has been further extended to the cases of massive uncharged and charged particles' tunneling recently. In this paper, as a particular black hole solution, we apply this extended method to reconsider the tunneling effect of the H.S Dilaton black hole. We investigate the behavior of both massive uncharged and charged particles, and respectively calculate the emission rate at the event horizon. Our result shows that their emission rates are also consistent with the unitary theory. Moreover, comparing with the case of massless particles' tunneling, we find that this conclusion is independent of the kind of particles. And it is probably caused by the underlying relationship between this method and the laws of black hole thermodynamics.
Tunnelling Effect and Hawking Radiation from a Vaidya Black Hole
Jun Ren,Jingyi Zhang,Zheng Zhao
Physics , 2006, DOI: 10.1088/0256-307X/23/8/016
Abstract: In this paper, we extend Parikh' work to the non-stationary black hole. As an example of the non-stationary black hole, we study the tunnelling effect and Hawking radiation from a Vaidya black hole whose Bondi mass is identical to its mass parameter. We view Hawking radiation as a tunnelling process across the event horizon and calculate the tunnelling probability. We find that the result is different from Parikh's work because $\frac{dr_{H}}{dv}$ is the function of Bondi mass m(v).
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