Gompertz曲线和Logistic曲线在生物数学中的比较与应用

Gompertz曲线方程和Logistic曲线方程常被用来描述生物生长与经济现象的S型生长过程,本文通过Mathematica软件使用Gompertz曲线方程和Logistic曲线方程对同一生物生长问题进行拟合,并根据拟合优度检验比较Gompertz曲线模型和Logistic曲线模型的拟合程度。     

种群离散Lotka-Volterra模型的精确解

非线性生态数学离散模型的持续生存性和全局稳定性等动力学的研究中,大多学者采用建立LiaPunov函数或者对特定模型进行直接分析以及数值模拟等方式,仅能较为普遍地刻画生态系统的一般性。选用差分方程更能准确地描述种群性态,因此将差分多项式系统的吴方法应用于两种群离散Lotka-Volterra模型的精确求解,并对所得解结构进行分析,为生态学研究提供可靠依据,即分析随着时间的推移种群是持续生存还是走向灭绝。     

具有时滞脉冲的Gompertz污染模型的全局吸引性

讨论了具有时滞脉冲的Gompertz食饵－捕食者污染模型,考虑了毒素的时滞影响,研究了该情况下种群持续生存的条件,得到了时滞对种群动力学性质的影响情况。     

具有时滞脉冲的Gompertz污染模型的持续性

讨论了具有时滞脉冲的Gompertz食饵—捕食者污染模型,考虑了毒素的时滞影响,研究了该情况下种群持续生存的条件,得到了时滞对种群动力学性质的影响情况.     

含时滞反应扩散方程周期解的存在唯一性

应用上下解和迭代方法研究了一类含多个离散时滞的单种群模型,得到了该方程周期解的存在唯一的一个充分条件。     

一类新的具脉冲出生单种群动力学模型分析

讨论了一类新的具脉冲出生的单种群动力学模型,利用离散动力系统频闪映射理论,得到了种群持续生存的充分条件．结论刻画了现实的生物种群动力学性质,也丰富了脉冲微分方程理论．     

一类非线性差分方程平衡点的全局吸引性

利用相关差分方程的全局吸引性得到了一类“食物有限”种群模型离散类似的正平衡点X=1全局吸引的充分条件。     

具有离散时滞的非局部单物种种群模型的行波解

研究了一类具有离散时滞的非局部单物种种群模型的行波解的存在性,证明了当时滞充分小时,方程具有连接两个平衡点的单调行波解。     

罗斯308肉鸡Gompertz生长模型的建立

为掌握罗斯308肉鸡生长发育的特点和规律,测量了0～5周龄罗斯308肉鸡的体重,计算了标准差、变异系数和均匀度等指标,建立了Gompertz生长模型,获得了生长发育参数和生长发育指标。结果表明:Gompertz生长模型能很好地模拟罗斯308肉鸡的生长过程,模型参数A、B、k分别为6 098.92、4.68、0.26,R^2为0.999 5;根据该模型计算的拐点周龄为5.94周,拐点日龄为41.55 d,拐点体重为2 243.67 g,最大周增重为583.35g,最大日增重为83.34 g;累积生长、绝对生长和相对生长都符合肉鸡生长发育的一般规律。此研究结果可以作为合理饲养和优化管理的重要参考。     

一类“食物有限”的离散种群模型的持久性

研究一类具有时滞的＂食物有限＂的离散种群模型,利用差分方程的振动理论,证明该系统的持久性.所得结果表明时滞对该系统的持久性没有影响.     

Exploring the Relations between In-service Training,Prior Contacts and Teachers’ Attitudes towards Persons with Intellectual Disability

This study investigates the relations between teachers’ attitudes towards persons with intellectual disability (ID), in-service training on ID, and prior contacts with persons with ID. A sample of Canadian elementary school teachers (N?=?118) completed the Attitudes Toward Intellectual Disability Questionnaire, which measures cognitive, affective and behavioural components of attitudes towards persons with ID. Correlational and multivariate regression analyses were performed. Frequent contacts with persons with ID and experience of including a child with ID increased the likelihood of reporting prior positive contacts with persons with ID. In turn, this was associated with less discomfort towards persons with ID and more willingness towards interactions. In-service training on ID was related to better knowledge of rights and capabilities of persons with ID. Experience of including a child with ID in general education classrooms increased the likelihood to report feeling competent in teaching children with ID, which predicted more willingness to include children with ID.     

兵无成势与经营之道

商场与战争有其相通的共同特点,以《孙子兵法》的智慧,精神指导商业实践,有如下要点:一、知彼知己,以“知”制胜;二、推陈出新,以“新”制胜;三、谋在人先,以“谋”制胜;四、合纵连横,以“交”制胜;五、奇正相生,以“奇”制胜;六、兵贵神速,以“快”制胜;七、以战养战,以“借”制胜;八、灵活多变,以“变”制胜;九、智勇双全,以“勇”制胜。     

A multidimensional study of special education students' attitudes towards people with disabilities: a focus on deafness

This study explores the attitudes of future professionals working with students with disabilities towards four exceptionality groups: persons with deafness, with paralysis, with mental retardation (MR) and with delinquent behaviour, and specifically examines how deafness is perceived in comparison with the three other groups. Undergraduate students' (N=177) attitudes towards the four groups were tapped using a semantic differential scale referring to the cognitive, emotional and behavioural components of attitudes. Participants' degree of contact with people with disabilities was also reported. Results indicated that attitudes towards people with deafness were more positive than those towards the other three groups. Attitudes towards persons with paralysis were more positive than towards persons with MR and with delinquent behaviour, except when personality was considered. Emotional reactions and behavioural tendencies towards persons with delinquent behaviour were the most negative. Contact with people with disabilities had significant but low correlations with some aspects of the attitudes towards people with MR and paralysis. In general, the results of this study suggested that deafness was perceived as a physical disability and not as a social phenomenon. They also demonstrated that attitudes towards people with disabilities are a function of the particular disability condition and are multidimensional.     

Late phonological development in Spanish children with bilateral hearing loss / Desarrollo fonológico tardío en niños españoles con pérdidas auditivas bilaterales

Abstract

This study has a twofold objective: to analyse and compare the phonological processes in a sample of Spanish children with hearing loss, both with a cochlear implant and with a hearing aid, with a group with normal hearing; and to determine whether there are differences between the participants with a cochlear implant and with a hearing aid in the frequency and nature of the phonological processes. The sample is made up of 168 participants, eight with hearing loss (four with an implant and four with a hearing aid) and 160 with normal hearing. Samples of spontaneous speech were collected and transcribed using the tools from the CHILDES project. For the analysis, the phonological processes paradigm was adopted, evaluating phonological development based on normative error rates. The participants with a hearing loss show slower phonological development in terms of phonological processes, along with atypical processes. Furthermore, the participants with cochlear implants committed more phonological errors than those that wear a hearing aid. The implications of the results are discussed, and it is recommended that auditory stimulation should be done early in children with hearing loss regardless of their technical aid.     

Interpersonal communication motives: A communibiological perspective

This study examined the relationships between interpersonal communication motives and temperament traits. Results indicated that extroversion was positively correlated with pleasure, affection, inclusion, escape, and relaxation and was not correlated with control. Extroversion accounted for the most unique variance in the pleasure and relaxation motives. Neuroticism was positively correlated with inclusion, escape, and control, negatively correlated with pleasure, and not correlated with affection and relaxation. Neuroticism accounted for the most unique variance in the escape motive. Psychoticism was positively correlated with control, negatively correlated with pleasure, affection, inclusion, and relaxation, and uncorrelated with escape. Psychoticism accounted for the most unique variance in the interpersonal motives of affection and inclusion.     

自我效能、兴趣水平与学习策略等八因素的相关性——以英语高职生为研究样本

本研究主要运用相关分析法及个人访谈法对来源于高职院校三大类学生的归因倾向、学校环境、兴趣水平、焦虑水平、学习策略水平、动机水平、动机行为、自我效能感水平分别与他们的自我效能感水平、兴趣水平作了相关分析。结果发现:三类不同学生归因倾向、学校环境、兴趣水平、焦虑水平、学习策略水平、动机水平、动机行为、自我效能感之间两两相关。对厌学者而言,自我效能与学习策略、动机行为达到非常显著的相关,与兴趣水平达到显著的相关,与学校环境存在不显著的负相关。兴趣水平与焦虑水平、自我效能达到非常显著的相关,与学校环境达到显著相关,与归因存在负相关。对次厌学者而言,自我效能与学习策略达到非常显著的相关,与动机行为达到显著相关,与学校环境、归因倾向呈现低等程度的负相关。乐学类学生的自我效能与动机行为产生了显著的正相关,与学校环境、归因方式产生低度负相关;他们的兴趣水平与动机水平、焦虑水平、自我效能、动机行为产生了中低度相关,与归因、学校环境、学习策略产生了中低程度的负相关。     

深入把握中国特色社会主义的科学内涵

党的十八大报告深刻而全面地阐释了中国特色社会主义的科学内涵,标志着我们党对中国特色社会主义的认识更加深刻、更加准确。中国特色社会主义道路、理论体系、制度统一于中国特色社会主义伟大实践中,也就形成了中国特色社会主义旗帜。深刻理解和准确把握旗帜、道路、理论体系、制度之间的关系,高举中国特色社会主义伟大旗帜,坚定中国特色社会主义的道路自信、理论自信、制度自信,是提升中国特色社会主义的境界,夺取中国特色社会主义新胜利、推进中国特色社会主义事业向前发展的重要保障。     

山西省高校教师工作满意度的调查研究

通过对山西省七所高校281名教师进行的工作满意度的调查研究表明:女性教师要比男性教师的工作满意度要高,但在工作满意度的各个维度上并无显著差异;不同婚姻状况在上级满意度、工作环境满意度、晋升的满意度上存在差异显著。未婚教师整体上要比已婚教师的工作满意程度高。不同年龄段的高校教师在工作满意度的各个维度上差异均显著,尤以30-39岁、40-49岁年龄段的高校教师工作满意度的得分低;不同学历的高校教师在对上级、对工资的满意度上差异显著;不同职称的高校教师在工作满意度的各个维度上差异均为显著,讲师与副教授工作满意度的得分较低;不同工作时间的高校教师在工作本身满意度、上级满意度以及工作环境满意度的维度上存在显著差异,工作时间为11-20年的高校教师各项工作满意度的指标得分均较低。     

科学把握宗教的“三性”,维护党的执政安全

宗教是一种长期的、复杂的社会历史现象。科学认识宗教,正确处理宗教问题,切实做好宗教工作,关系到党和国家工作的全局,关系到社会和谐稳定,关系到全面建设小康社会进程,关系到中国特色社会主义事业发展,最终关系到党的执政安全。在我国社会主义条件下,我们必须科学把握宗教的长期性、群众性和特殊复杂性,从而维护好党的执政安全。     

毛泽东与中国特色社会主义

中国特色社会主义“始于毛,成于邓”。毛泽东对中国特色社会主义建设道路的探索可分为三个阶段,即基本正确的探索期、正误交织的曲折期和严重错误的失败期;思想框架几乎涉及了社会主义建设的全部内容。其探索有成绩也有失误,但作为起点,其正反经验都对中国特色社会主义有重大启示意义。