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Search Results: 1 - 10 of 104297 matches for " Jinying Zhang "
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An Explicit Solution for Perpetual American Put Options in a Markov-Modulated Jump Diffusion Model
Jinying Tong,Zhenzhong Zhang
Progress in Applied Mathematics , 2012, DOI: 10.3968/j.pam.1925252820120402.3025
Abstract: This paper is concerned with the pricing of perpetual American put options when the dynamics of the risky underlying asset are driven by a jump diffusion with Markovian switching. By using the ``modified smooth pasting'' technique, we derive an explicit optimal stopping rule and the corresponding value function in a closed form. Finally, we present a numerical example to illustrate the application of the exact solution.
Severe energy situation in Hebei Province, China: Where is the way out?
Li Jinying, Zhang Chunlian, Tian Junli
Open Journal of Mechanical Engineering , DOI: 10.7508/JME-V1-N2-1-10
Abstract: In this paper, through the analysis of nearly 20 years of energy production, consumption structure in Hebei Province, we find problems between energy consumption, production and supply and demand balance and put forward suggestions for future energy development; meanwhile, the energy demand trend has been analyzed. Finally, we proposed energy development strategy of Hebei. It has a great significance to optimize the industrial structure and achieve sustainable development of Hebei Province in the future.
The Aide Diagnosis of Cardiac Heart Diseases Using a Deoxyribonucleic Acid Based Backpropagation Neural Network
Li Shi,Zhizhong Wang,Lijia Wang,Jinying Zhang
International Journal of Distributed Sensor Networks , 2009, DOI: 10.1080/15501320802533418
Abstract: In this paper, a novel diagnostic scheme of cardiac heart diseases is presented using a Deoxyribonucleic Acid (DNA)-based BP(DNA-BP) Neural Network by distinguishing the shapes of ST segments automatically. First, wavelet transform is applied to extract the ST segments by identifying the characteristic points in the ECG. ECG signals are decomposed by aTrous Algorithm using dyadic spline wavelets. The relationship between the feature points of ECG signals and the modulus maximum pairs of the signals' wavelet transform is established, and the R-wave and ST segment's fiducial points are extracted at different wavelet scales. Second, in order to overcome the disadvantages of the BP neural network, a DNA optimization method is adopted to optimize the original weights and bias of a BP neural network. The BP algorithm is used to find the most optimal values of the weights and bias of the BP network. At last the effectiveness of the proposed aided diagnostic scheme is demonstrated via the experiments which the data are from the clinical study and MIT/BIH ECG data base. In order to validate the advantages of the DNA-based BP (DNA-BP) network and determine the best application conditions of the network, two types of experiments were conducted. In each experiment, 30 samples were selected as the training data and testing data respectively. In the first type of experiments, the data were obtained from the ECG of different people. While in the second type of experiments, the data were obtained from the ECG of one person at different times. The same data and the conditions were used in both BP and GA-based BP (GA-BP) networks to illustrate the advantages of the proposed DNA-based BP network. The experiment results illustrate that the proposed DNA-based BP network overcomes the limitation of the sloping method in identifying straight line ST segments and the limitation of function fitting method in fitting accuracy. It also surmounts the disadvantages of a BP network in terms of the local minimum, slow convergence, and the shortcomings of GA-BP in terms of its limitation in algorithm coding and evolution ways.
A novel gene R049 identified in uropathogenic Escherichia coli provides partial protection in mice from colonization
JinYing Chen,Xin Ge,YuMei Zhang,Xu Lin,Wei Zhang,Xi Yang
Chinese Science Bulletin , 2011, DOI: 10.1007/s11434-010-4342-6
Abstract: Uropathogenic Escherichia coli (UPEC) is the most common causative organism of human urinary tract infection (UTI). Several UPEC virulence factors have been identified, but more are yet to be found. We previously identified a novel 789-bp-long DNA fragment (named R049) in UPEC strain 132 using a suppressive subtractive hybridization technique. In the present study, we used genome walking to elongate the sequence of this fragment to obtain the whole gene sequence and examined the role of this gene product in generating protective immunity. Through bioinformatic analysis, we predicted that this gene is a 1311-bp open reading frame (ORF), which we designated ORFR049 (GenBank accession No.: EF488001). We further constructed a prokaryotic expression system to express full recombinant R049 protein and isolated and purified the protein through IPTG induction and nickel affinity chromatography. Using mouse immunosera generated by the purified protein, we confirmed the natural expression and outer membrane localization of the protein in wild-type strain UPEC132 by Western blotting. To test the potential of this protein as a vaccine candidate, we immunized mice with the recombinant protein before challenging them with UPEC132 through the urinary tract. The results showed significantly reduced bacterial colonization in the urine and kidneys of the immunization group compared with the control group. However, the degree of renal pathological damage was not significantly improved in the immunized mice. Our study has identified a novel gene of UPEC which can generate protective immunity against UTI. This novel gene provides a promising new vaccine candidate.
Thermodynamic analysis of multiphase periodic structures based on a spatial and temporal multiple scale method
周期性结构热动力时间-空间多尺度分析

Zhang Hongwu,Zhang Sheng,Bi Jinying,
张洪武
,张盛,毕金英

力学学报 , 2006,
Abstract: A spatial and temporal multiscale asymptotic homogenization method simulating the wave propagation problem in periodic multiphase materials is systematically studied. Generalized function field governing equations of wave propagation are expressed in a unified form with both inertia and velocity items. Amplified spatial and reduced temporal scales are, respectively, introduced to account for spatial and temporal fluctuations and nonlocal effect of the homogenized solution due to material heterogeneity on different time scales, The model is derived from the higher-order homogenization theory with multiple spatial and temporal scales. By combining various orders of homogenized function field equations, the reduced time dependence is eliminated and then the fourth-order differential equations are derived. To avoid the necessity of C^1-continuity in finite element implementation, the C^0-continuous mixed finite element approximation of the resulting nonlocal equations of function field is put forward. Non-FoUrier heat conduction and thermal dynamic problem are computed to demonstrate the efficiency and validity of the theories and models developed and indicate the disadvantages of the classical spatial homogenization.
A New Ursane-Type Nor-Triterpenoid from the Leaves of Eucommia ulmoides Oliv.
Chuangjun Li,Li Li,Chao Wang,Jingzhi Yang,Fei Ye,Jinying Tian,Yikang Si,Dongming Zhang
Molecules , 2012, DOI: 10.3390/molecules171213960
Abstract: A new ursane-type nortriterpenoid, (11S,12S)-4-methyl-11,12-epoxy-2-hydroxy-3-oxoursa-1,4-dine-28-oic acid γ-lactone (1), named ulmoidol A, together with ten known compounds: ulmoidol (2), corosolic acid (3), 2α,3α-dihydroxy-24-nor-4(23),12-oleanadien-28-oic acid (4), oleanolic acid (5), ursolic acid (6), cycloart-3β, 25-diol (7), foliasalacioside B1 (8), (6R,7E,9R)-9-hydroxy-4,7-megastigmadien-3-one-9-O-α-L-arabinopyranosyl-(1→6)-β-D-glucopyranoside (9), (6R,7E,9R)-9-hydroxy-4,7-megastigma-dien-3-one-9-O-β-D-xylopyranosyl-(1→6)-β-D-glucopyranoside (10), and quercetin 3-O-sambubioside (11) were isolated from the leaves of Eucommia ulmoides Oliv. The structure of compound 1 was determined by extensive spectroscopic analysis, and its absolute configuration was determined by CD experiments and a computational method. Compounds 3, 4, 7–10 were isolated from this plant for the first time. Compounds 3 and 4 showed inhibition to PTPIB activities, with IC50 values of 0.69 and 3.98 μM, respectively.
Aerobic Biodegradation Performance of Six Volatile Organic Compounds by Activated Sludge Acclimated with Toluene
6种挥发性有机物在甲苯驯化微生物中的好氧生物降解性能

Zhang Heqing,Hu Hongying,Xi Jinying,
张鹤清
,胡洪营,席劲瑛

环境科学 , 2003,
Abstract: The degradation performance of six volatile organic compounds (VOCs), toluene, o-xylene, m-xylene, p-xylene, benzene and chlorobenzene by activated sludge acclimated with toluene were studied. The experimental results showed that the biodegradation rates of o-xylene, m-xylene, p-xylene, benzene and chlorobenzene increased with increasing of their initial liquid concentration; when concentrations of o-xylene, m-xylene, p-xylene, benzene and chlorobenzene were less than 149mg/L, 129mg/L, 133mg/L, 234mg/L and 146mg/L respectively, neither of them brought any notable inhibition or poisonous effects on microbes, and their aerobic biodegradation accorded with first-order reaction. When concentrations of toluene were more than 85mg/L, its biodegradation rate didn't increase with increasing of its initial liquid concentration and the biodegradation of toluene accorded with the Monod equation.
Efficient Dynamic Nuclear Polarization at High Magnetic Fields
Gavin W. Morley,Johan van Tol,Arzhang Ardavan,Kyriakos Porfyrakis,Jinying Zhang,G. Andrew D. Briggs
Physics , 2006, DOI: 10.1103/PhysRevLett.98.220501
Abstract: By applying a new technique for dynamic nuclear polarization involving simultaneous excitation of electronic and nuclear transitions, we have enhanced the nuclear polarization of the nitrogen nuclei in 15N@C60 by a factor of 1000 at a fixed temperature of 3 K and a magnetic field of 8.6 T, more than twice the maximum enhancement reported to date. This methodology will allow the initialization of the nuclear qubit in schemes exploiting N@C60 molecules as components of a quantum information processing device.
Category of Attractor and Its Application  [PDF]
Jinying Wei, Yongjun Li, Mansheng Li
Journal of Applied Mathematics and Physics (JAMP) , 2015, DOI: 10.4236/jamp.2015.37086
Abstract:

In this paper, we provide a new approach to study the geometry of attractor. By applying category, we investigate the relationship between attractor and its attraction basin. In a complete metric space, we prove that the categories of attractor and its attraction basin are always equal. Then we apply this result to both autonomous and non-autonomous systems, and obtain a number of corresponding results.

The Existence and Stability of Synchronizing Solution of Non-Autonomous Equations with Multiple Delays  [PDF]
Jinying Wei, Yongjun Li, Xiaohua Zhuo
Journal of Applied Mathematics and Physics (JAMP) , 2016, DOI: 10.4236/jamp.2016.47136
Abstract:

In this paper, we consider an abstract non-autonomous evolution equation with multiple delays in a Hilbert space H: u'(t) + Au(t) = F(u(t-r1),...,u((t-rn)) + g(t),?where A: D(A)?HH?is a positive definite selfadjoint operator, F: HnaHis a nonlinear mapping, ?r1,...,rn?are nonnegative constants, and g(t) C(;H)?is bounded. Motivated by [1] [2], we obtain the existence and stability

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