In this paper, we first present a generalization of the Cauchy-Schwarz inequality. As an application of our result, we obtain a new sufficient condition for the stability of a class of nonlinear impulsive control systems. We end up this note with a numerical example which shows the effectiveness of our method.

The purpose of this note is to study impulsive control and synchronization of memristor based chaotic circuits shown by Muthuswamy. We first establish a less conservative sufficient condition for the stability of memristor based chaotic circuits. After that, we discuss the effect of errors on stability. Meanwhile, we also discuss impulsive synchronization of two memristor based chaotic systems. Our results are more general and more applicable than the ones shown by Yang, Li, and Huang. Finally, several numerical examples are given (...) to show the effectiveness of our methods. (shrink)

This paper addresses the simultaneous attitude and position tracking of a target spacecraft in the presence of general unknown bounded disturbances in the framework of dual quaternions, which provides a concise and integrated description of the coupled rotational and translational motions. By virtue of the newly introduced dual direction cosine matrix, the dimension of the dual quaternion-based relative motion dynamics written in vector/matrix form can be lowered to six. Treating the disturbances as unknown parameters, a modular adaptive pose tracking control (...) scheme composed of two separately designed parts is then derived. One part is the adaptive disturbance estimator designed based on the immersion and invariance theory. Driven by the disturbance estimation errors, it can realize exponential convergence of the estimations and has the nice “parameter lock” property, which can hardly be expected in the conventional certainty equivalent adaptive controllers. The other part is a proportional-derivative-like pose tracking controller where the estimated disturbances are directly used. The closed-loop stability of the relative motion system under different kinds of disturbances is proven by Lyapunov stability analysis. Simulations and comparisons with two previous dual quaternion-based controllers demonstrate the novel features and performance improvements of the proposed control scheme. (shrink)

Our research aimed to investigate the effectiveness of auditory, visual, and audiovisual warning signals for capturing the attention of the pilot, and how stimulus onset asynchronies in audiovisual stimuli affect pilots perceiving the bimodal warning signals under different perceptual load conditions. In experiment 1 of the low perceptual load condition, participants discriminated the location of visual targets preceded by five different types of warning signals. In experiment 2 of high perceptual load, participants completed the location task identical to a low (...) load condition and a digit detection task in a rapid serial visual presentation stream. The main effect of warning signals in two experiments showed that visual and auditory cues presented simultaneously could effectively and efficiently arouse the attention of the pilots in high and low load conditions. Specifically, auditory, AV, and visual preceding auditory stimulus by 100 ms increased the spatial orientation to a valid position in low load conditions. With the increase in visual perceptual load, auditory preceding the visual stimulus by 100 ms and A warning signals had stronger spatial orientation. The results are expected to theoretically support the optimization design of the cockpit display interface, contributing to immediate flight crew awareness. (shrink)

ObjectivesAlthough socioeconomic status has been shown to be an important determinant of physical activity in adults, the association in children and adolescents remains less consistent based on evidence from western developed countries. The purpose of this study, therefore, is to investigate associations between SES and PA among Chinese children and adolescents.MethodsA cross-sectional study was conducted with a self-reported questionnaire in China. The multi-stage stratified cluster sampling method was used, and 2,955 children and adolescents were enrolled in this study. SES was (...) assessed by measuring parental education levels, perceived family wealth, and Family Affluence Scale II. PA was assessed by reliable and valid items from the Health Behavior School-aged Children Surveillance questionnaires. Descriptive statistics were used to report sample characteristics, including demographic characteristics, levels of PA, and SES. The Chi-square test was applied to analyze the differences of PA in gender and school period. Binary logistic regression was used to analyze the association between SES and PA among children and adolescents.ResultsOverall, 10.4% of children and adolescents accumulated moderate-to-vigorous physical activity at least 60 min per day. Boys were more physically active than girls. Higher socioeconomic status was positively associated with higher physical activity levels among children and adolescents, especially using FAS and mother education level as SES measures. The association between SES and PA varied by gender and grade group, and the effects of SES are also different on weekdays and weekends.ConclusionThis study found socioeconomic disparities in PA among Chinese children and adolescents, and showed the importance of targeting children and adolescents with low SES intervention priority. Based on these research findings, it is suggested that SES, especially for FAS and mother education level, should be considered when designing and implementing the promotion of regular PA in children and adolescents. Health policymakers may use this information to develop interventions to reduce health inequalities among children and adolescents in the future. (shrink)

Previous studies have shown that the color red can affect basic motor functioning. However, these studies utilized simple gross motor tasks rather than those assessing complex fine motor skills. Moreover, these empirical studies were theoretically based on the threat–behavior link in human and non-human animals, and neglected the relationship between arousal and motor performance. According to the Yerkes–Dodson law and the inverted-U hypothesis in sport psychology, for simple motor tasks, high arousal is more advantageous than low arousal ; for complex (...) motor tasks, low arousal is more advantageous than high arousal. The current research examined the effect of color on different kinds of motor skills based on the inverted U-hypothesis. In Experiment 1, we examined the effect of red and blue on dart-throwing performance, whereas in Experiment 2, we examined the effect of red and blue on grip strength performance. The results showed that performance of fine motor skill in the blue condition was better than in the red condition, and performance of gross motor skill in the red context was better than in the blue context. These results indicate that the type of motor skill assessed moderates the influence of red and blue on motor performance. (shrink)

ObjectivesWuhan is the city where coronavirus disease was first reported and developed into a pandemic. However, the impact of the prolonged COVID-19 pandemic on medical staff burnout remains limited. We aimed to identify the prevalence and major determinants of burnout among medical staff 1 year after the beginning of the COVID-19 pandemic in Wuhan, China.Materials and MethodsA total of 1,602 medical staff from three hospitals in Wuhan, China, were included from November 1–28, 2021. Chi-square tests were conducted to compare the (...) prevalence of burnout across groups based on sociodemographic and professional characteristics. A multivariate analysis was performed using a forward stepwise logistic regression model.ResultsApproximately 37.39% of the medical staff experienced burnout 1 year after COVID-19 pandemic. Emotional exhaustion was the most common symptom of burnout, with 1,422 participants reporting a severe EE. Burnout was associated with insufficient social support and “neutral” or “dissatisfied” patient-physician relationships. Respondents who participated in the care of COVID-19 patients had a higher risk of burnout symptoms than those who did not participate. In particular, mental resilience was negatively associated with burnout among the medical staff.ConclusionNearly two-fifths of the participants had symptoms of burnout, with reduced personal accomplishment being the predominant symptom 1 year after COVID-19. Healthcare organizations should regularly measure and monitor burnout among the medical staff. In addition, creating positive work environments and improving the mental resilience of medical staff may be effective ways to reduce burnout. (shrink)

广东优秀社会科学著作出版基金资助出版国家哲学社会科学“九五”规划课题项目广东省高校“九五”青年人文社会科学研究项目广州市社会科学基金资助项目广州市社会科学院资助课题.

本书内容包括:导论:从抽象意志论到实践意志论;西方意志理论的历史演变及其困境等。.

本书是我国学者全面系统地阐述杜威学术思想的第一部专著,对杜威的哲学思想和教育思想做出实事求是的评价。.

本书从原则指导、规律制度、方法艺术、心理疏导和提高素质等五个方面,比较系统、完整而又深刻细致地分析了部队基层经常性思想工作。.

本书选录历代著名作家对龙舟竞技活动进行表现的诗文作品,介绍作者生平,注解难点字词,并对作品艺术手法、思想进行评论等。.

本书饱蘸着我军军魂所赋予我们的激情,与战友们一起追忆我军以往的辉煌历程,讴歌我军当今的伟大壮举,憧憬我军未来的丰功伟绩,漫议军人的理想、信仰、道德、信念、气节、情操、奉献、价值。.

本书精选海登·怀特、卡洛·金兹堡等名家最具代表性的十五篇文章，就后现代主义史学理论中的诸多议题展开讨论，不仅是对该领域数十年发展的总结，也对历史哲学与历史实践本身进行了深刻反思。.

余英時（美國普林斯頓大學榮休教授）推薦！ 《智者的現世關懷：牟宗三的政治與社會思想》 遍檢《牟宗三先生全集》相關文獻 利用新發現的佚著和《全集》未收的通信 將牟宗三的政治與社會思想 置於其所在社會、歷史與思想的整體脈絡中， 予以全面與深入的梳理和考察 探討牟宗三的「現世關懷」 作為現代新儒學的代表人物，牟宗三（1909-1995）不僅有其心性之學的詮釋與建構，同時有其政治與社會的關懷與思考。從20世紀30年代到90年代，其政治與社會思想一直都有表達。從早年對唯物辯證法和唯物 史觀的批判、對中國社會史和中國農村問題的探究，到晚年對兩岸關係與臺灣認同的申論，以及一生批判共產主義，在反省與檢討的基礎上提倡自由、民主，都是力圖要為現代中國政治社會的實踐提供一個正確的思想基礎。 彭國翔透過本書遍檢《牟宗三先生全集》相關文獻，利用新發現的佚著和《全集》未收的通信，將牟宗三的政治與社會思想置於其所在社會、歷史與思想的整體脈絡之中，予以了全面與深入的梳理和考察。本書採取了微觀分析和 宏觀綜合交互為用的研究方式，依據具體內涵，將牟宗三的「現世關懷」分成七章，一一詳加論述；通過概念的分析和澄清，微觀的功效在全書中獲得了充分的發揮。但著者並不是為分析而分析，把每一章當作一種孤立現象來處 理。相反的，他的目的是展現牟宗三的「現世關懷」的全貌。因此，各章之間都互相關聯，合而讀之，即成一宏觀的整體。本書的另一重大特色是網羅牟宗三的著作鉅細不遺，從佚文到未刊書信，凡是和「現世關懷」相關的文獻 ，已搜集到應有盡有的地步。 本書第一章是牟宗三對於唯物辯證法和唯物史觀的批判。第二章是牟宗三關於中國社會史發展階段和形態的主張。第三章是牟宗三關於中國農村問題的看法。第四章是牟宗三一生對於共產主義的批判。第五章是牟宗三關於「自由 」和「自由主義」的看法。第六章是牟宗三對於民主政治的肯定和反省。第七章是牟宗三關於中國大陸與台灣兩岸關係的見解。 《智者的現世關懷》既從結構上展現了牟宗三政治與社會思想的各個方面，也大體照顧了牟宗三政治與社會思想在時間發展上的順序。此外，如果第一章到第四章主要反映牟宗三政治與社會思想中「破」的方面，第五至第七章則 主要反映他政治與社會思想中「立」的方面。 總的來說，本書顧及牟宗三一生政治與社會思想的各個方面，同時力求對每一個方面都予以徹底的把握和分析。其二、以盡可能全面掌握牟宗三的各種原始文獻作為研究的基礎。其三，對牟宗三政治與社會思想的處理方式。.

本书包括: 全球视域中当代儒学的定位、方法与成果的检讨、当代儒学的课题与人物、儒家传统的政治哲学资源四部分内容.