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Search Results: 1 - 10 of 26092 matches for " Yun Tian "
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Reciprocating Engine Step Load Response in Islanded Power Generation  [PDF]
Yun Tian, Rudie Crous
Energy and Power Engineering (EPE) , 2013, DOI: 10.4236/epe.2013.54B066
Abstract: The step load response of reciprocating engines is one of the key characteristics when considering its application in medium to large scale stationary power generation especially with islanded generation. This paper discusses the impacts of power frequency deviation on the generators and electrical equipment in the network and presents the relationship between step load capabilities and generator operating parameters. For a power plant consisting of a number of generators both step load and power output requirements must be satisfied. An analysis method is proposed to facilitate the development of an operation strategy which can meet both step load and power demand requirements in the full load range.  Typical reciprocating engine step load curves are used to demonstrate the analysis method and the results are further optimised for lower operational cost. This analysis method provides a general approach to operation strategy of large reciprocating engines used in islanded power generation.
New Dynamic Equations of Aerosol in Air of Certain Type  [PDF]
Tian-Quan Yun
Atmospheric and Climate Sciences (ACS) , 2017, DOI: 10.4236/acs.2017.74037
Abstract: A new dynamic equation of aerosol in air is derived, using a model-in-model, by equilibrium of buoyancy, gravity and pressure, together with conservation laws of mass, momentum and energy via Reynolds transport theorem and supplemented by corresponding scientific laws for related properties of air and aerosols. This new dynamic equation of aerosol in air is a set of non-linear partial differential equations involved six unknown functions of mass densities, pressure, air and aerosol speeds and temperature. It has features: 1, it belongs to certain type; 2, it emphases the effect of buoyancy in equilibrium and potential energy, and the Archimedes principle of buoyancy is firstly extended to lateral directions based on logical deduction, the phenomenon of stirring a glass of oil-water mixture and the recorded of Hurricane Isabel (2003) from space station. The later shows the evidence of existence of lateral buoyancy; 3, the mass densities of air and aerosol of a point in our model are varied in different directions due to traction and are treated as vectors, and they have been used in the calculation of lateral buoyancy.
Simple Differential Equations of A & H Stock Prices and Application to Analysis of Equilibrium State  [PDF]
Tian-Quan Yun, Tao Yun
Technology and Investment (TI) , 2010, DOI: 10.4236/ti.2010.12013
Abstract: Similar to the simplest differential equation of stock price, a set of simultaneous differential equations of stock prices of the same share in both A and H stock markets have been established. This is a set of simultaneous nonlinear differential equations, which can be solved by iteration method via a proof by g-contraction mapping theorem. Further more, the exact solution for equilibrium state and an example of checking the price prediction of “China Petroleum” (601857) at a conference held in May 2008 are given.
Clinical observation of Zhihua Decoction in treatment of atrophic gastritis complicated by intestinal metaplasia and dysplasia: a report of 78 cases
Yun TIAN
Zhong Xi Yi Jie He Xue Bao , 2008,
Abstract:
Strong Convergence Theorem by Monotone Hybrid Algorithm for Equilibrium Problems, Hemirelatively Nonexpansive Mappings, and Maximal Monotone Operators
Yun Cheng,Ming Tian
Fixed Point Theory and Applications , 2009, DOI: 10.1155/2008/617248
Abstract: We introduce a new hybrid iterative algorithm for finding a common element of the set of fixed points of hemirelatively nonexpansive mappings and the set of solutions of an equilibrium problem and for finding a common element of the set of zero points of maximal monotone operators and the set of solutions of an equilibrium problem in a Banach space. Using this theorem, we obtain three new results for finding a solution of an equilibrium problem, a fixed point of a hemirelatively nonexpnasive mapping, and a zero point of maximal monotone operators in a Banach space.
Strong Convergence Theorem by Monotone Hybrid Algorithm for Equilibrium Problems, Hemirelatively Nonexpansive Mappings, and Maximal Monotone Operators
Cheng Yun,Tian Ming
Fixed Point Theory and Applications , 2008,
Abstract: We introduce a new hybrid iterative algorithm for finding a common element of the set of fixed points of hemirelatively nonexpansive mappings and the set of solutions of an equilibrium problem and for finding a common element of the set of zero points of maximal monotone operators and the set of solutions of an equilibrium problem in a Banach space. Using this theorem, we obtain three new results for finding a solution of an equilibrium problem, a fixed point of a hemirelatively nonexpnasive mapping, and a zero point of maximal monotone operators in a Banach space.
Bifurcation of ten small-amplitude limit cycles by perturbing a quadratic Hamiltonian system
Yun Tian,Pei Yu
Mathematics , 2013,
Abstract: This paper contains two parts. In the first part, we shall show that the result given in the Zoladek's example [1], which claims the existence of 11 small-amplitude limit cycles around a singular point in a particular cubic vector filed, is not correct. Mistakes made in the paper [1] leading to the erroneous conclusion have been identified. In fact, only 9 small-amplitude limit cycles can be obtained from this example after the mistakes are corrected, which agrees with the result obtained later by using the method of focus value computation [2]. In the second part, we present an example by perturbing a quadratic Hamiltonian system with cubic polynomials to obtain 10 small-amplitude limit cycles bifurcating from an elementary center, for which up to 5th-order Melnikov functions are used. This demonstrates a good example in applying higher-order Melnikov functions to study bifurcation of limit cycles.
On Longest Repeat Queries Using GPU
Yun Tian,Bojian Xu
Computer Science , 2015,
Abstract: Repeat finding in strings has important applications in subfields such as computational biology. The challenge of finding the longest repeats covering particular string positions was recently proposed and solved by \.{I}leri et al., using a total of the optimal $O(n)$ time and space, where $n$ is the string size. However, their solution can only find the \emph{leftmost} longest repeat for each of the $n$ string position. It is also not known how to parallelize their solution. In this paper, we propose a new solution for longest repeat finding, which although is theoretically suboptimal in time but is conceptually simpler and works faster and uses less memory space in practice than the optimal solution. Further, our solution can find \emph{all} longest repeats of every string position, while still maintaining a faster processing speed and less memory space usage. Moreover, our solution is \emph{parallelizable} in the shared memory architecture (SMA), enabling it to take advantage of the modern multi-processor computing platforms such as the general-purpose graphics processing units (GPU). We have implemented both the sequential and parallel versions of our solution. Experiments with both biological and non-biological data show that our sequential and parallel solutions are faster than the optimal solution by a factor of 2--3.5 and 6--14, respectively, and use less memory space.
Comparison of Nondestructive Testing Methods on Detection of Delaminations in Composites
Liang Cheng,Gui Yun Tian
Journal of Sensors , 2012, DOI: 10.1155/2012/408437
Abstract: Delamination is one of the most common defects in carbon fibre reinforced plastic (CFRP) components, such as those used in aircraft and wind turbine blades. To detect delaminations, different NDT methods such as ultrasonic (UT), eddy current (EC) scanning, flash thermography, and recent developed pulsed-eddy-current-(PEC-) simulated thermography are conducted for comparison and evaluation of the new developed PEC thermography system at Nanjing University of Aeronautics and Astronautics (NUAA), China through UK-China collaboration. A PEC-stimulated thermography system is built at NUAA, extended from previous joint work between Newcastle and Bath Universities. Using these NDT systems, man-made, dedicated delaminations with varied diameters and depths are investigated and studied. Through this comparison, PEC-stumilated and flash thermography show relatively good indications of the shape of delaminations. The joint studies also show that PEC-stimulated thermography has unique advantage for fibre orientation evaluation. 1. Introduction A composite material can be defined as a combination of two and more materials with very different mechanical, thermal, and electrical properties. Due to the low weight and high strength of composites, they are popular for use in aircraft and wind turbine blades. Delamination is one of the most common defects for composite materials. It leads to the degradation of mechanical properties and also causes the failure of the overall composite component. To detect delaminations and ensure the safe operation of composite components, nondestructive evaluation (NDE) techniques are used during both manufacturing and operation of the materials. For NDE of CFRP, a series of specific methods are in continuing development to increase the probability of fault detection at a high-confidence level. The multilayered structure of CFRP allows the use of Lamb waves [1–4] with good results for the qualitative evaluation of CFRP materials. X-ray methods are also used [5], along with acoustic emission techniques [6, 7]. Because carbon fibres are electrically conductive, for the nondestructive evaluation of CFRP, electromagnetic methods such as those based on eddy currents [8, 9] and microwaves [10] can be used. An extremely promising technique is thermography, which has the advantage of good fault detection possibility along with the capacity to inspect a large area within a short time. Thermography is also applicable to a wide range of materials, including glass fibre, carbon fibre composites, and metallic materials, where specific excitation
Research on the Model of Electric Vehicle Charging Device Based on PSCAD  [PDF]
Run-rong Fan, Tian-yuan Tan, Yun-peng Gao, Hui Chang
Energy and Power Engineering (EPE) , 2013, DOI: 10.4236/epe.2013.54B260
Abstract:

The following article has been retracted due to improper duplication. The Editorial Board takes a very strong respect to the author’s situation on this matter. This paper published in Energy and Power Engineering?Vol.5 No.4B, November 20, 2013, has been removed from this site.

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