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Search Results: 1 - 10 of 4427 matches for " Huili Qiao "
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Sexual difference in gonadal development of embryonic chickens after treatment of polychlorinated biphenyls
Changge Fang,Caiqiao Zhang,Huili Qiao,Guoliang Xia,Yaoxing Chen
Chinese Science Bulletin , 2001, DOI: 10.1007/BF02901168
Abstract: Polychlorinated biphenyls (PCBs) are ubiquitous, persistent and lipophilic environmental endocrine disrupters that can be biomagnified in human and animals including birds and thus to affect reproductive functions. Poultry meat and eggs contain a great deal of fat and possibly concentrate higher PCBs and other environmental contaminants such as dichlorodiphenyl-trichloroethane (DDT). In order to identify the adverse effects of PCBs and possible sexual difference on chicken gonadal development, Aroclor 1254 was injected into fertilized Hyline chicken eggs before incubation. Four groups of eggs received yolk injection of either peanut oil as control, 1, 10 or 100 μg/egg of Aroclor 1254 as treatment group, respectively. After hatching the gonads were removed for histological examination. Testicular structure was apparently changed and exhibited dramatic decrease in area of the transverse sections (1 μg/egg,P < 0.01; 10 and 100 μg/egg,P < 0.001), diameter (10 and 100 μg/egg,P < 0.05) and relative area of the testicular tubules (10 μg/egg,P < 0.05; 100 μg/egg,P < 0.01). Most testicular tubules of the highest dose group degenerated and even disappeared. The differentiation of germ cells was retarded in all groups treated with Aroclor 1254. Some germ cells were irregular in shape, with vacuolated cytoplasm and hyperchromatism nucleus (pyknosis) in 1 and 10 μg/egg groups and almost all germ cells in 100 μg/egg group. In contrast, the area of the left ovarian transverse sections increased dramatically (10 and 100 μg/egg,P < 0.001), the ovarian cortex manifested a significant increment in thickness (1, 10 and 100 μg/egg,P < 0.001) and a higher number of oocytes was observed (1, 10 and 100 μg/egg,P < 0.001) in the female chickens treated with Aroclor 1254 compared with the control group. A few oocytes with vacuolated cytoplasm and hyperchromatic nucleus were also observed in ovarian cortex after PCBs exposure. These results showed that PCBs interfered with gonadal development with a sex-specific pattern and retarded differentiation of spermatogonia into spermatocytes but accelerated differentiation of oogonia into oocytes in the embryonic chickens.
Uniqueness for the martingale problem associated with pure jump processes of variable order
Huili Tang
Mathematics , 2007,
Abstract: Let $L$ be the operator defined on $C^2$ functions by $$L f(x)=\int[f(x+h)-f(x)-1_{(|h|\leq 1)}\nabla f(x)\cdot h]\frac{n(x,h)}{|h|^{d+\alpha(x)}}dh.$$ This is an operator of variable order and the corresponding process is of pure jump type. We consider the martingale problem associated with $L$. Sufficient conditions for existence and uniqueness are given. Transition density estimates for $\alpha$-stable processes are also obtained.
The Optimal Control and MLE of Parameters of a Stochastic Single-Species System
Huili Xiang,Zhijun Liu
Discrete Dynamics in Nature and Society , 2012, DOI: 10.1155/2012/676871
Abstract: This paper investigates the optimal control and MLE (maximum likelihood estimation) for a single-species system subject to random perturbation. With the help of the techniques of stochastic analysis and mathematical statistics, sufficient conditions for the optimal control threshold value, the optimal control moment, and the maximum likelihood estimation of parameters are established, respectively. An example is presented to illustrate the feasibility of our theoretical results. 1. Introduction The Malthus model is usually expressed as where , stands for the density of species at moment, and is the intrinsic growth rate. As everyone knows, model (1.1) has epoch-making significance in mathematics and ecology and later, many deterministic mathematical models have been widely studied (see [1–5]). In fact, a population system is inevitably affected by the environmental noise in the real world. As a consequence, it is reasonable to study a corresponding stochastic model. Notice that some recent results, especially on optimal control, for the following stochastic model have been obtained (see [6–9]), where stands for the standard Brownian motion. However, for some pest populations, their generations are nonoverlapping (e.g., poplar and willow weevil, osier weevil and paranthrene tabaniformis) and the discrete models are more appropriate than the continuous ones. Compared with the continuous ones, the study on discrete mathematical models is more challenging. Inspired by [1–12], in this paper we will consider the following discrete model of system (1.2) where , , and any two of them are independent. stands for the noise intensity. We will focus on the optimal control threshold value, the optimal control moment, and the maximum likelihood estimation of parameters. To the best of our knowledge, no work has been done for system (1.3). The rest of this paper is organized as follows. In Section 2, some preliminaries are introduced. In Section 3, we give three results of this paper. As applications of our main results; an example is presented to illustrate the feasibility of our theoretical results in Section 4. 2. Preliminaries In this section, we summarize several definitions, assumptions, and lemmas which are useful for the later sections. Definition 2.1. Only when the quantity of pest population reaches one starts to control the pest population, and the real number is called to be a control threshold value. Definition 2.2. Until the th generation, the total quantity of pest population first reaches the control threshold value, then one says that is the first
Research into the Mental Lexicon Representation of Chinese English Learners Based on Spreading Activation Model
Huili WANG,Yan HOU
Studies in Literature and Language , 2011,
Abstract: Nowadays, the main idea regarding the organization of the lexicon is that words are stored in an organized intertwined semantic network. However, relatively little is known about the actual process that takes place during the course of activation production. Therefore, in order to gain a deeper understanding of the problems in question, this study conducted word association test to 150 sophomores in Dalian University of Technology (DUT) and tried to show the internal relations of mental lexicon in data by calculating the word frequency between certain words through a computer program which is written based on the actual calculating steps. And the innovation of this study is to show the abstract lexicon relation in data and illustrate the mental lexicon representation in three-dimensional figures by Netdraw software. Through the study we find: (1) The responses with higher frequency in the first few positions may not ensure themselves high association strength to the stimuli. And the current research also proves that activation of mental lexicon is not a “one stop” process but a linear forward one. (2) The data of association strength obtained from this study may help us convert the abstract lexicon relation into concrete statistical facts and establish representation of the mental lexicon network model. At last, the mechanism of Spreading Activation Model is illustrated and the implications for future English teaching are provided. Key Words: Mental lexicon; Word association test; Mental lexicon representation; Association strength
Apoptosis of Rheumatoid Arthritis Fibroblast-Like Synoviocytes: Possible Roles of Nitric Oxide and the Thioredoxin 1
Huili Li,Ajun Wan
Mediators of Inflammation , 2013, DOI: 10.1155/2013/953462
Nonlinear Discrete Periodic Boundary Value Problems at Resonance
Ma Ruyun,Ma Huili
Advances in Difference Equations , 2009,
Abstract: Let be an integer with , and let . We study the existence of solutions of nonlinear discrete problems , where with is the th eigenvalue of the corresponding linear eigenvalue problem.
Nonlinear Discrete Periodic Boundary Value Problems at Resonance
Ruyun Ma,Huili Ma
Advances in Difference Equations , 2009, DOI: 10.1155/2009/360871
Abstract: Let T∈ be an integer with T>2, and let :={1,…,T}. We study the existence of solutions of nonlinear discrete problems Δ2u(t 1)+λka(t)u(t)+g(t,u(t))=h(t), t∈ , u(0)=u(T), u(1)=u(T+1), where a,h: → with a>0, λk is the kth eigenvalue of the corresponding linear eigenvalue problem.
Design of Evaluation Index System of Brand Space Expansion Capacity Based on the Brand DNA
International Business and Management , 2011, DOI: 10.3968/j.ibm.1923842820110301.075
Abstract: The combination of ecology and brand management promotes the development of brand ecological management effectively. This study, from the perspective of biology DNA, analogy describes Brand DNA and builds the model of Brand DNA elements. Then, establish evaluation index of the brand space expansion capacity systematically from brand foundation developing capacity, brand operation management capacity, brand market control capacity, brand sustainable developing capacity and brand relationship management capacity, etc. It is aimed at providing decision-making basis for enterprise to execute brand space expansion strategy scientificly. Key words: Brand DNA; Brand space expansion; Evaluation index system
The Impact of Second Language Proficiency on Chinese ESL Learners’ English Word Recognition
Lan Luan,Huili Wang
Asian Social Science , 2009, DOI: 10.5539/ass.v5n1p37
Abstract: This study investigated the impact of Chinese ESL learners’ second language (L2) proficiency on English word recognition in a lexical decision task. The study focused on the interaction among one between-participant variable (L2 proficiency) and three within-participant variables (orthographic neighborhood density, word frequency, and words/nonwords). ANOVA and two-tailed t-test indicated that: the accuracy (ACC) differences to orthographic neighborhood density (High/Low N), word frequency (High/Medium/Low F) and words/nonwords between high/low L2 proficiency (High/Low P) participants were significant respectively, while reaction time (RT) was not. In terms of ACC, highly-proficient Chinese ESL learners performed better using words with N, F, words/nonwords factors than low-proficient ones. In conclusion, higher L2 proficiency facilitated Chinese ESL learners’ English word recognition in a lexical decision task blocked by N, F, words/nonwords factors.
Green Growth as the Best Choice for Chinese Small and Medium Enterprises in Sustainable Development
Huili Wang,Chunyou Wu
Asian Social Science , 2011, DOI: 10.5539/ass.v7n5p81
Abstract: It has been admitted that green growth is a focus for various international organizations. The paper aims to clarify the fact that green growth is the best choice for Chinese small and medium enterprises (SMEs) in sustainable development. Problems and opportunities in the sustainable development of SMEs are discussed. Finally, some feasible approaches to the green growth of Chinese SMEs are elaborated.
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