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Search Results: 1 - 10 of 65238 matches for " Wu Qing-Chu "
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Investigation of a Unified Chaotic System and Its Synchronization by Simulations*

WU Qing-Chu,FU Xin-Chu,Michael Small,

中国物理快报 , 2010,
Abstract: We investigate a unified chaotic system and its synchronization including feedback synchronization and adaptive synchronization by numerical simulations. We propose a new dynamical quantity denoted by K, which connects adaptive synchronization and feedback synchronization, to analyze synchronization schemes. We find that K can estimate the smallest coupling strength for a unified chaotic system whether it is complete feedback or one-sided feedback. Based on the previous work, we also give a new dynamical method to compute the leading Lyapunov exponent.
Epidemic thresholds in a heterogenous population with competing strains

Wu Qing-Chu,Fu Xin-Chu,Yang Meng,

中国物理 B , 2011,
Abstract: Among many epidemic models, one epidemic disease may transmit with the existence of other pathogens or other strains from the same pathogen. In this paper, we consider the case where all of the strains obey the susceptible-infected-susceptible mechanism and compete with each other at the expense of common susceptible individuals. By using the heterogenous mean-field approach, we discuss the epidemic threshold for one of two strains. We confirm the existence of epidemic threshold in both finite and infinite populations subject to underlying epidemic transmission. Simulations in the Barabasi-Albert (BA) scale-free networks are in good agreement with the analytical results.
A Test on the 3-Dimensional Model of Achievement Goals in Sports:An Empirical Study on Elite Table Tennis Players
对运动成就目标三维模型的检验 ──一项对高水平乒乓球运动员的实证研究

Si Gang-yan,Lee Qing-chu,Liu Hao,

心理学报 , 2007,
Abstract: Introduction The present study aimed at testing Harwood, Hardy and Swain's (2000) 3-dimensional model of achievement goals in sports. The three dimensions are pure task, self-referenced ego involvement and norm-referenced ego involvement. Their proposal came out from the criticisms of Nicholl's (1984, 1987) popular 2-dimensional task-ego goal orientation theory in sports and its related instruments, namely the Task and Ego Orientation Sport Questionnaire,and the Perception of Success Questionnaire. Harwood, Hardy and Swain questioned (a) the rationale for differentiating effort from ability in competition, and(b) the appropriateness of using the two questionnaires as the items have failed to effectively discriminate among individuals who are truly high, low or moderate in task or ego involvement. Method Two studies were conducted. Study 1 reports the development of a 9-item Achievement Goal Questionnaire (AGQ). Reliability and validity of the questionnaire were assessed. The objective of Study 2 was to assess the nature of achievement goal orientation and involvement state of four elite table tennis players (M=2, F=2) before, during and after competition. Four important matches were selected and videotaped, and interviews were conducted within three days of each important match. Any changes in achievement goal orientation and involvement state were noted when the players recalled experiencing an adverse or good situation during the match in question. Qualitative method was used to analyze the content of the interviews. Results Confirmatory factor analysis resulted in a clear 3-factor solution. Test-retest (2 weeks apart) statistics showed good reliability of each of the three factors. Consistent results obtained from the coaches' evaluation of the four players and the players' responses to the AGQ lent further support to the convergent validity of the questionnaire. The findings in Study 2 showed that: (1) there was inconsistency between the four players' achievement goal orientation and involvement state before an important match, reflecting the influence of both individual characteristics and qualities of particular opponents; (2) before and during competition the players' involvement state showed a multiple-goal tendency; the players could focus on a single goal as well as two or three goals at the same time; (3) after competition their goal involvement state tended to be affected by the process and result of the competition; and (4) sub-goal involvement state (characterized by a lack of strong achievement goal motivation) was also observed when players experienced major setbacks in the competition. Conclusion The results of this study support Harwood, Hardy and Swain's 3-dimensional model of achievement goals. A reliable and valid questionnaire was developed to test the model. The questionnaire should, however, be further refined by extending to other sports and a wider variety of athletes. In addition, the study has indicated the nature of t
A Compact Ka-Band Broadband Waveguide-Based Traveling-Wave Spatial Power Combiner with Low Loss Symmetric Coupling Structure
Zhi-Yong Kang;Qing-Xin Chu;Qiong Sen Wu
PIER Letters , 2013, DOI: 10.2528/PIERL12111311
Abstract: A compact Ka-band broadband waveguide-based traveling-wave spatial power combiner is presented. The low loss micro-strip probes are symmetrically inserted into both broadwalls of waveguide, quadrupling the coupling ways but the insertion loss increases little. The measured 16 dB return-loss bandwidth of the eight-way back-to-back structure is from 30 GHz to 39.4 GHz (more than 25%) and the insertion loss is less than 1 dB, which predicts the power-combining efficiency is higher than 90%.
1-Phenyl-5-[4-(trifluoromethyl)phenyl]pyrazolidin-3-one monohydrate
Yuan-Yuan Liu,Zhen-Yi Wu,Hong Shi,Qing-Yan Chu
Acta Crystallographica Section E , 2008, DOI: 10.1107/s1600536808032261
Abstract: In the molecule of the title compound, C16H13F3N2O·H2O, the two benzene rings are oriented at a dihedral angle of 82.55 (3)° and the pyrazole ring adopts an envelope conformation. In the crystal structure, intermolecular C—H...F hydrogen bonds link the molecules into chains.
Multiple recurrence for two commuting transformations
Qing Chu
Mathematics , 2009,
Abstract: This paper is devoted to a study of the multiple recurrence of two commuting transformations. We derive a result which is similar but not identical to that of one single transformation established by Bergelson, Host and Kra. We will use the machinery of "magic systems" established recently by B. Host for the proof.
Convergence of weighted polynomial multiple ergodic averages
Qing Chu
Mathematics , 2008,
Abstract: We study here weighted polynomial multiple ergodic averages. A sequence of weights is called universally good if any polynomial multiple ergodic average with this sequence of weights converges in $L^{2}$. We find a necessary condition and show that for any bounded measurable function $\phi$ on an ergodic system, the sequence $\phi(T^{n}x)$ is universally good for almost every $x$. The linear case was understood by Host and Kra.
Convergence of multiple ergodic averages along cubes for several commuting transformations
Qing Chu
Mathematics , 2008,
Abstract: We prove the norm convergence of multiple ergodic averages along cubes for several commuting transformations, and derive corresponding combinatorial results. The method we use relies primarily on the "magic extension" established recently by B. ~Host.
Revenue and Knowledge Cooperation Mechanisms between Business Incubators and Venture Capitalists for Collaborative Start-Ups  [PDF]
Wenqing Wu, Qing Han
Theoretical Economics Letters (TEL) , 2017, DOI: 10.4236/tel.2017.75091
Abstract: Business incubators and venture capital are effective instruments for supporting the development of new firms. The purpose of this paper is to explore cooperation mechanisms between business incubators and venture capitalists and find the equilibriums of the mechanisms. Also, this paper puts forward three mechanisms, revenue sharing mechanism, cost sharing mechanism and knowledge sharing mechanism, to discuss the cooperation between business incubators and venture capitalists. Meanwhile, we consider the effect of the business incubator’s altruism and compare the three cooperation mechanisms with and without altruism. The results indicate that the mechanism of revenue sharing leads to the highest incubator’s revenue sharing proportion. Additionally, the incubator’s revenue sharing proportion decreases even though its final profit increases when considering altruism. Therefore, the nonprofit incubator can be better for cooperating with the venture capitalist than the profit incubator. Finally, financial returns can influence their cooperation.

WU Hui Qing WU Qing Ping GO Chu Sheng LI Jian Ying LIU Shu Fang,WU Jun,

微生物学通报 , 2003,
Abstract: 利用好食脉孢霉发酵蔗渣、麸皮、木薯渣等工农业有机废料 ,生产可用于配制饲用复合酶制剂的酶制品。合适的培养基配方为每千克固体料中含蔗渣 10 0 g、麸皮 6 0 0g、木薯渣 30 0 g ,并添加 2 0g复合氮源和适量的磷酸盐 ,培养基含水量为固体料干重的两倍 ;接种后先在 34℃以下培养 2d ,然后在 37℃发酵 2~ 3d ,发酵过程中无光照、空气供应充分、培养基中含水量损失不能太大。发酵结束后固体曲中纤维素酶活力 (CMC +C1) 1,75 9mg/g/h ,糖化酶活力 3,110mg/ g
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