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Search Results: 1 - 10 of 105953 matches for " Shuang Zhang "
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A Case Report of Fever of Unknown Origin (FUO)  [PDF]
Shuang Huang, Yonghong Zhang
Journal of Cancer Therapy (JCT) , 2013, DOI: 10.4236/jct.2013.47131
Abstract:

A 10-year-old boy had a long time of fever, and was diagnosed as JRA at first, but the patient’s condition got worse and worse after the treatment, then we did the cervical lymph node biopsy, which showed ALCL (Anaplastic Large Cell Lymphoma). After receiving the correct treatment, the patient’s condition got better.

Internal Transactions for Multiple Risky Assets  [PDF]
Qiong Zhang, Shuang Chen
Open Journal of Statistics (OJS) , 2019, DOI: 10.4236/ojs.2019.91008
Abstract: Most of the articles about insider trading assume that there is only one risky asset in the market. On the basis of these papers, this thesis is mainly divided into three parts to study the situation of multiple risky assets in the market. In the first part, the situation of multiple risky assets in the market when two transactions are in progress is studied and then, the equilibrium when the market requires the internal traders to disclose the trading volume after each transaction is analyzed. In the second part, the equilibrium of multi-period based on the two phases of transaction is derived. The third part is the summary of the paper.
Factorizations of invertible operators and $K$-theory of $C^*$-algebras
Shuang Zhang
Mathematics , 1993,
Abstract: Let $\Scr A$ be a unital C*-algebra. We describe \it K-skeleton factorizations \rm of all invertible operators on a Hilbert C*-module $\Scr H_{\Scr A}$, in particular on $\Scr H=l^2$, with the Fredholm index as an invariant. We then outline the isomorphisms $K_0(\Scr A) \cong \pi _{2k}([p]_0)\cong \pi _{2k} ({GL}^p_r(\Scr A))$ and $K_1(\Scr A)\cong \pi _{2k+1}([p]_0)\cong \pi _{2k+1}(GL^p_r(\Scr A))$ for $k\ge 0 $, where $[p]_0$ denotes the class of all compact perturbations of a projection $p$ in the infinite Grassmann space ${Gr}^{\infty }(\Scr A)$ and $GL^p_r(\Scr A)$ stands for the group of all those invertible operators on $\Scr H_{\Scr A}$ essentially commuting with $p$.
Economy, Environment and Government: Study on the Path of Supply-Side Reform Forced by the Fog-Haze  [PDF]
Jiaorui Li, Ye Zhang, Shuang Zhang
Journal of Applied Mathematics and Physics (JAMP) , 2019, DOI: 10.4236/jamp.2019.72023
Abstract: Unbalanced development in term as industrial structure and the efficiency use of energy have aggravated environmental pollution to different degrees resulting in the increase of range, time and degree of fog-haze. This, in turn, forced the government to carry out supply-side reforms, to improve energy efficiency and optimize the industrial structure to weaken the environmental pollution. To tackle these problems, this work provides an index system for the issues related to fog-haze, uses a non-linear ST-SVAR model to reflect the effects of industrial structure and energy use efficiency on fog-haze. Results indicated that: First, current industrial structure and energy use efficiency have greater impact on the comprehensive equation of fog-haze risk than itself. With the passage of time, this influence is still gradually expanding. Second, the equations of industrial structure and energy use efficiency are strongly influenced by themselves, and other variables as the current period have less impact on them. Finally, the non-linear or asymmetric relationship is shown among industrial structure, energy use efficiency, and the fog-haze comprehensive risk equation.
Dynamics of a stochastic non-autonomous predator-prey system with Beddington-DeAngelis functional response
Shuang Li, and Xinan Zhang
Advances in Difference Equations , 2013, DOI: 10.1186/1687-1847-2013-19
Abstract: MSC: 92B05, 34F05, 60H10, 93E03.
The Theoretical Study of Technical Barriers to Trade
Tingqin Zhang,Shuang Cheng
International Journal of Business and Management , 2009,
Abstract: Entry into WTO means that enterprises enter into a complete market competition which brings both challenges and opportunities. With the rapid development of globalization, tariff barriers in international trade are more and more decreased. On the contrary, technical barriers to trade, such as technical code, technical standard, and so on, have stood out recently. In order to solve the problem of TBT better, I did a little study to the technical barriers to trade existing in our international trade and hope it is helpful for the TBT of our international trade.
Alleviation of Cosmic Age Problem In Interacting Dark Energy Model
Shuang Wang,Yang Zhang
Physics , 2008, DOI: 10.1016/j.physletb.2008.09.055
Abstract: We investigate the cosmic age problem associated with the old high-$z$ quasar APM 08279 + 5255 and the oldest globular cluster M 107, both being difficult to accommodate in $\Lambda$CDM model. By evaluating the age of the Universe in a model that has an extremely phantom like form of dark energy (DE), we show that simply introducing the dark energy alone does not remove the problem, and the interaction between dark matter (DM) and DE need to be taken into account. Next, as examples, we consider two interacting DE models. It is found that both these two interacting DE Models can predict a cosmic age much greater than that of $\Lambda$CDM model at any redshift, and thus substantially alleviate the cosmic age problem. Therefore, the interaction between DM and DE is the crucial factor required to make the predicted cosmic ages consistent with observations.
On the Solution to the "Frozen Star" Paradox, Nature of Astrophysical Black Holes, non-Existence of Gravitational Singularity in the Physical Universe and Applicability of the Birkhoff's Theorem
Shuang-Nan Zhang
Physics , 2010, DOI: 10.1142/S0218271811019906
Abstract: Oppenheimer and Snyder found in 1939 that gravitational collapse in vacuum produces a "frozen star", i.e., the collapsing matter only asymptotically approaches the gravitational radius (event horizon) of the mass, but never crosses it within a finite time for an external observer. Based upon our recent publication on the problem of gravitational collapse in the physical universe for an external observer, the following results are reported here: (1) Matter can indeed fall across the event horizon within a finite time and thus BHs, rather than "frozen stars", are formed in gravitational collapse in the physical universe. (2) Matter fallen into an astrophysical black hole can never arrive at the exact center; the exact interior distribution of matter depends upon the history of the collapse process. Therefore gravitational singularity does not exist in the physical universe. (3) The metric at any radius is determined by the global distribution of matter, i.e., not only by the matter inside the given radius, even in a spherically symmetric and pressureless gravitational system. This is qualitatively different from the Newtonian gravity and the common (mis)understanding of the Birkhoff's Theorem. This result does not contract the "Lemaitre-Tolman-Bondi" solution for an external observer.
Astrophysical Black Holes in the Physical Universe
Shuang-Nan Zhang
Physics , 2010,
Abstract: In this chapter I focus on asking and answering the following questions: (1) What is a black hole? Answer: There are three types of black holes, namely mathematical black holes, physical black holes and astrophysical black holes. An astrophysical black hole, with mass distributed within its event horizon but not concentrated at the singularity point, is not a mathematical black hole. (2) Can astrophysical black holes be formed in the physical universe? Answer: Yes, at least this can be done with gravitational collapse. (3) How can we prove that what we call astrophysical black holes are really black holes? Answer: Finding direct evidence of event horizon is not the way to go. Instead I propose five criteria which meet the highest standard for recognizing new discoveries in experimental physics and observational astronomy. (4) Do we have sufficient evidence to claim the existence of astrophysical black holes in the physical universe? Answer: Yes, astrophysical black holes have been found at least in some galactic binary systems, at the center of almost every galaxy, and as the central engines of at least some long gamma-ray bursts. (5) Will all matter in the universe eventually fall into black holes? Answer: Probably "no", because "naked" compact objects, if they do exist with radii smaller than the radii of event horizons for their masses but are not enclosed by event horizons, can rescue the universe from an eternal death by re-cycling out the matter previously accreted into astrophysical black holes. Finally I also discuss briefly if we need a quantum theory of gravity in order to further understand astrophysical black holes, and what further astronomical observations and telescopes are needed to make further progress on our understanding of astrophysical black holes.
Black Hole Binaries and Microquasars
Shuang-Nan Zhang
Physics , 2013, DOI: 10.1007/s11467-013-0306-z
Abstract: This is a general review on the observations and physics of black hole X-ray binaries and microquasars, with the emphasize on recent developments in the high energy regime. The focus is put on understanding the accretion flows and measuring the parameters of black holes in them. It includes mainly two parts: (1) Brief review of several recent review article on this subject; (2) Further development on several topics, including black hole spin measurements, hot accretion flows, corona formation, state transitions and thermal stability of standard think disk. This is thus not a regular bottom-up approach, which I feel not necessary at this stage. Major effort is made in making and incorporating from many sources useful plots and illustrations, in order to make this article more comprehensible to non-expert readers. In the end I attempt to make a unification scheme on the accretion-outflow (wind/jet) connections of all types of accreting BHs of all accretion rates and all BH mass scales, and finally provide a brief outlook.
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