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Smoking of Carica papaya in Nigeria:The rationale,the public health effects and policies for intervention
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作者 Abolaji Paul Adekeye 《Asian Pacific Journal of Tropical Medicine》 SCIE CAS 2024年第3期95-96,共2页
Psychoactive substance use is characterized by the habitual use of substances that have significant effects in altering the activities of neurotransmitters in certain regions of the brain.Consequently,these alteration... Psychoactive substance use is characterized by the habitual use of substances that have significant effects in altering the activities of neurotransmitters in certain regions of the brain.Consequently,these alterations manifest as cognitive,emotional,perceptual and behavioural changes in affected individuals[1]. 展开更多
关键词 rational behaviour emotional
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Comparative study on emotional behavior and parental job stress of only-child and non-only-child preschool children
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作者 Zhi-Wei Fu Kai-Li Wang +3 位作者 Ning-Yu Du Yue-Jing Li Jing-Jing Duan Sheng-Xia Zhao 《World Journal of Clinical Cases》 SCIE 2024年第21期4642-4651,共10页
BACKGROUND Studies have revealed that Children's psychological,behavioral,and emotional problems are easily influenced by the family environment.In recent years,the family structure in China has undergone signific... BACKGROUND Studies have revealed that Children's psychological,behavioral,and emotional problems are easily influenced by the family environment.In recent years,the family structure in China has undergone significant changes,with more families having two or three children.AIM To explore the relationship between emotional behavior and parental job stress in only preschool and non-only preschool children.METHODS Children aged 3-6 in kindergartens in four main urban areas of Shijiazhuang were selected by stratified sampling for a questionnaire and divided into only and nononly child groups.Their emotional behaviors and parental pressure were compared.Only and non-only children were paired in a 1:1 ratio by class and age(difference less than or equal to 6 months),and the matched data were compared.The relationship between children's emotional behavior and parents'job stress before and after matching was analyzed.RESULTS Before matching,the mother's occupation,children's personality characteristics,and children's rearing patterns differed between the groups(P<0.05).After matching 550 pairs,differences in the children's parenting styles remained.There were significant differences in children's gender and parents'attitudes toward children between the two groups.The Strengths and Difficulties Questionnaire(SDQ)scores of children in the only child group and the Parenting Stress Index-Short Form(PSI-SF)scores of parents were significantly lower than those in the non-only child group(P<0.05).Pearson’s correlation analysis showed that after matching,there was a positive correlation between children's parenting style and parents'attitudes toward their children(r=0.096,P<0.01),and the PSI-SF score was positively correlated with children's gender,parents'attitudes toward their children,and SDQ scores(r=0.077,0.193,0.172,0.222).CONCLUSION Preschool children's emotional behavior and parental pressure were significantly higher in multi-child families.Parental pressure in differently structured families was associated with many factors,and preschool children's emotional behavior was positively correlated with parental pressure. 展开更多
关键词 Only child Family structure Children's emotional behavior Parental stress Tendency score
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The Impact of the“Belt and Road”Initiative on Industrial Structure Upgrading Along the Corridor
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作者 Fangyuan Lou 《Proceedings of Business and Economic Studies》 2024年第3期194-199,共6页
The“Belt and Road”initiative functions as a novel impetus for China’s external economic development within the framework of the new normal of economic growth.By leveraging panel data from 30 provinces and regions a... The“Belt and Road”initiative functions as a novel impetus for China’s external economic development within the framework of the new normal of economic growth.By leveraging panel data from 30 provinces and regions across China for the period of 2010 to 2020,this research assesses the influence of the“Belt and Road”initiative on the enhancement of the industrial structure along its trajectory.The findings indicate that:the most notable influence on the rationalization and progress of the industrial structure is observed in the eastern region,with the central region following suit,whereas the western region has yet to exhibit a significant transformation.The analysis delves into the role of technological innovation,concluding that the initiative primarily catalyzes optimization and upgrading through the effect of technological advancement.The study advances several pertinent policy recommendations to support and enhance these developments. 展开更多
关键词 Belt and Road Industrial structure advancement Industrial structure rationalization
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Multivariate Rational Response Surface Approximation of Nodal Displacements of Truss Structures 被引量:1
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作者 Shan Chai Xiang-Fei Ji +1 位作者 Li-Jun Li Ming Guo 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2018年第1期100-113,共14页
Polynomial-basis response surface method has some shortcomings for truss structures in structural optimization,concluding the low fitting accuracy and the great computational effort. Based on the theory of approximati... Polynomial-basis response surface method has some shortcomings for truss structures in structural optimization,concluding the low fitting accuracy and the great computational effort. Based on the theory of approximation, a response surface method based on Multivariate Rational Function basis(MRRSM) is proposed. In order to further reduce the computational workload of MRRSM, focusing on the law between the cross-sectional area and the nodal displacements of truss structure, a conjecture that the determinant of the stiffness matrix and the corresponding elements of adjoint matrix involved in displacement determination are polynomials with the same order as their respective matrices, each term of which is the product of cross-sectional areas, is proposed. The conjecture is proved theoretically for statically determinate truss structure, and is shown corrected by a large number of statically indeterminate truss structures. The theoretical analysis and a large number of numerical examples show that MRRSM has a high fitting accuracy and less computational effort. Efficiency of the structural optimization of truss structures would be enhanced. 展开更多
关键词 Multivariate rational function Response surfaces method Truss structures structure optimization
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Size structure of urban agglomerations in China:rationality evaluation,patterns, and implications
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作者 Deli Wang Jinchuan Huang +3 位作者 Qingshan Yang Shasha Lu Yi Chen Xingliang Guan 《Chinese Journal of Population,Resources and Environment》 2018年第4期329-342,共14页
This paper establishes a diagnostic model for assessing the rationality of size structure of urban agglomerations(UAs) in China. The model is designed to determine from a three-dimensional index including size distrib... This paper establishes a diagnostic model for assessing the rationality of size structure of urban agglomerations(UAs) in China. The model is designed to determine from a three-dimensional index including size distribution index(SDI), size compactness index(SCI), and size efficiency index(SEI). The spatio-temporal pattern of size structure involving the studied 19 UAs and its implications are explored. The results indicate that size structure of China's UAs advanced from a low rationality development stage to a moderate rationality development stage in 1995-2015.Among them, the SDI and SEI were reasonably high, and the SCI was relatively low. Spatially, the high rationality UAs were distributed across eastern China, while the low rationality UAs were located in western China. UAs with positive size structure possessed typically a dual-or multicenter urban structure, while UAs with negative size structure usually presented as a single-center structure. The evolutionary trajectories of rationality of size structure of UAs can be summarized as four different stages. Our findings suggest that, in addition to consolidating the status of national-level UAs, the development of regional-level UAs should be promoted. Also, the fostering focus and direction should be oriented toward an UA with dual-or multicenter spatial structure. 展开更多
关键词 SIZE structure rationalITY evaluation SIZE distribution INDEX SIZE COMPACTNESS INDEX SIZE efficiency INDEX urban AGGLOMEration China
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Dynamic Evaluation of Rationality of Land Use Structure in the Changsha-Zhuzhou-Xiangtan Area
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作者 Jinning XIE Jianhua GUO +1 位作者 Kaiguo YUAN Bin QUAN 《Asian Agricultural Research》 2015年第12期49-51,58,共4页
The rationality of land use structure was evaluated with dynamic TOPSIS method based on changing data of land use from 2008 to 2011 in the Changsha-Zhuzhou-Xiangtan area. The results showed that during 2008- 2011,the ... The rationality of land use structure was evaluated with dynamic TOPSIS method based on changing data of land use from 2008 to 2011 in the Changsha-Zhuzhou-Xiangtan area. The results showed that during 2008- 2011,the rationality of land use structure was totally high,the dynamic value hi of Changsha,Zhuzhou,Xiangtan and the Changsha-Zhuzhou-Xiangtan area was 0. 7954,0. 7821,0. 8245 and0. 8186,respectively; the value Ci( tk) reflecting the rationality of land use structure at different time points was rapidly increased,and the gap between regions was not big and shrinking. According to the grey relational analysis,the change of different land use types had different effects on the rationality of land use structure: transportation land,the land for cities,towns and villages and the land for mining and industry are most highly correlated with the rationality of land use structure,while arable land,woodland,water area and water conservancy facility land have also an important impact on the rationality of land use structure; controlling the excessive growth of transportation land,the land for cities,towns and villages and the land for mining and industry,protecting arable land,forest land,water area and water conservancy facility land,and moderately increasing the garden plot,plays a decisive role in optimizing the land use structure in the Changsha-Zhuzhou-Xiangtan area. 展开更多
关键词 DYNAMIC TOPSIS method LAND USE structure rationalITY evaluation Changsha-Zhuzhou-Xiangtan
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THE RATIONALISM THEORY AND ITS FINITE ELEMENT ANALYSIS METHOD OF SHELL STRUCTURES
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作者 李龙元 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 1990年第4期395-402,共8页
In this paper, a kind of rationalism theory of shell is established which is of different mechanic characters in tension and in compression, and the finite element numerical analysis method is also described.
关键词 THE rationalISM THEORY AND ITS FINITE ELEMENT ANALYSIS METHOD OF SHELL structureS THAN
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Rapid Expansion of China's Electronics Industry Towards a Rational Structure
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《China's Foreign Trade》 1999年第4期23-23,共1页
关键词 rational Rapid Expansion of China’s Electronics Industry Towards a rational structure
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Application of rational emotive behavior therapy in patients with colorectal cancer undergoing adjuvant chemotherapy 被引量:5
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作者 Yuxin Liu Xiaoyan Ni +2 位作者 Rong Wang Huini Liu Zifen Guo 《International Journal of Nursing Sciences》 CSCD 2022年第2期147-154,I0002,I0003,共10页
Objective:This study aimed to explore the effects of our rational emotive behavior therapy(REBT)program on symptoms,anxiety,depression,and sleep state in patients with colorectal cancer(CRC)undergoing chemotherapy.Met... Objective:This study aimed to explore the effects of our rational emotive behavior therapy(REBT)program on symptoms,anxiety,depression,and sleep state in patients with colorectal cancer(CRC)undergoing chemotherapy.Methods:From October 2020 to May 2021,fifty-six patients with CRC in a hospital in the Hunan Province were randomly divided into an intervention group(n=28)and a control group(n=28).The patients in the intervention group completed a 6-week REBT program based on routine nursing care,including four courses:1)establish a relationship and formulate health files;2)group communications and study symptom management;3)continuously provide health knowledge and strengthen healthy behavior;and 4)review the treatment and summary.The control group maintained routine nursing care.The simplified Chinese version of the Memorial Symptom Assessment Scale Short Form(MSASeSFeSC),the Hospital Anxiety and Depression Scale(HADS),and the Pittsburgh Sleep Quality Index(PSQI)scale were used to investigate and compare the intervention effects of the two groups at baseline(T1,before the intervention),four weeks(T2),and six weeks(T3)after the intervention.Results:The intervention group was significantly improved in symptoms,anxiety,depression,and sleep state,compared with the control group.At T2,MSASeSFeSC(24.43±4.26 vs.28.07±3.91),symptom distress(17.29±4.04 vs.19.39±3.59),symptom frequency(7.14±1.51 vs.8.68±1.42),HADS(13.68±3.38 vs.15.86±3.79),anxiety(3.89±1.85 vs.5.18±2.18),and depression(9.79±2.06 vs.10.68±2.23),showed that the difference between the two groups was statistically significant(P<0.05).At T3,MSASeSFeSC(23.89±3.54 vs.30.14±3.94),symptom distress(17.61±3.52 vs.21.32±3.57),symptom frequency(6.29±1.49 vs.8.82±1.47),HADS(11.82±2.57 vs.16.29±3.13),anxiety(3.21±1.64 vs.5.61±1.77),and depression(8.61±1.52 vs.10.68±1.81),showed that the difference between the two groups was statistically significant(P<0.05).The sleep state of the intervention group was better than the control group at T3,with decreased score of PSQI[4.00(3.00,8.00)vs.9.00(7.00,12.50),Z=-3.706,P<0.001].Conclusion:The 6-week REBT program can effectively improve the symptom,anxiety,depression,and sleep state of patients with CRC undergoing chemotherapy,which could as a care plan for patients with CRC who are repeatedly admitted to the hospital for chemotherapy. 展开更多
关键词 ANXIETY Adjuvant chemoradiotherapy Colorectal neoplasms DEPRESSION PATIENTS rational emotive behavior therapy
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Rational-emotive behavioral intervention helped patients with cancer and their caregivers to manage psychological distress and anxiety symptoms 被引量:8
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作者 Chiedu Eseadi 《World Journal of Clinical Oncology》 CAS 2019年第2期62-66,共5页
There is a dearth of evidence-based data on how psychological distress and death anxiety symptoms experienced by cancer patients and caregivers are treated in developing regions. This article sheds light on the report... There is a dearth of evidence-based data on how psychological distress and death anxiety symptoms experienced by cancer patients and caregivers are treated in developing regions. This article sheds light on the report of the findings from a 2016 study that revealed a rational-emotive behavioral intervention helped a select group of cancer patients and their family caregivers to manage problematic assumptions, psychological distress, and death anxiety symptoms in Nigeria.Based on my experience as a co-investigator and corresponding author of this previous study, I addressed the challenges of conducting such a study and the implications for future research in this article. This article encourages future researchers to replicate the study and endeavor to overcome the limitations of the previous study. Funders were also encouraged to ensure increased access to funds for conducting similar studies with cancer patients and their family caregivers in developing countries and other parts of the world. 展开更多
关键词 CANCER PATIENTS CAREGIVERS Death anxiety PSYCHOLOGICAL distress PSYCHOLOGICAL INTERVENTION rational-emotive behavioral INTERVENTION rational-emotive hospice care therapy
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Personality Traits, Thinking Styles, and Emotional Intelligence in Nursing, towards Healthcare Providers’ Characterization and Safer Patient Care
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作者 Adel Omar Bataweel 《Open Journal of Nursing》 2023年第2期130-166,共37页
Background: This study explored nursing personality traits (Big Five Inventory BFI), emotional intelligence (EI), and thinking styles (Rational, RS, and Experiential, ES) together with demographic data to see how they... Background: This study explored nursing personality traits (Big Five Inventory BFI), emotional intelligence (EI), and thinking styles (Rational, RS, and Experiential, ES) together with demographic data to see how they could relate and the implication of this on nurses and patient safety. Design: A cross-sectional study. Methods: Nursing sample (n = 435). Participants completed a self-report online survey, which included demographic information, followed by questionnaires to measure personality traits, thinking styles, and emotional intelligence. Results: Spearman’s rank correlation was computed to assess the relationship between EI and Extraversion;there was a moderate positive correlation between the two variables, r = 0.487, p r = 0.731, p r = 0.723, p r = -0.666, p r = 0.467, p Conclusion: Different studies consolidated each other, and all converge and channel into the concept of characterization of healthcare providers for better support to them and safer patient care. EI correlated with all BFI components, and both positively impacted all desirable behaviors. Therefore, it would be valuable if organizations invested in increasing EI in their providers as it might highlight areas for improvement and equip providers with appropriate and advantageous coping strategies. 展开更多
关键词 Patient Safety emotional Intelligence Thinking Style rational Style Experiential Style Medical Error Personality Traits BFI BURNOUT And Healthcare Worker Characterization
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Systematic rationalization approach for multivariate correlated alarms based on interpretive structural modeling and Likert scale 被引量:5
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作者 高慧慧 徐圆 +2 位作者 顾祥柏 林晓勇 朱群雄 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2015年第12期1987-1996,共10页
Alarm flood is one of the main problems in the alarm systems of industrial process. Alarm root-cause analysis and alarm prioritization are good for alarm flood reduction. This paper proposes a systematic rationalizati... Alarm flood is one of the main problems in the alarm systems of industrial process. Alarm root-cause analysis and alarm prioritization are good for alarm flood reduction. This paper proposes a systematic rationalization method for multivariate correlated alarms to realize the root cause analysis and alarm prioritization. An information fusion based interpretive structural model is constructed according to the data-driven partial correlation coefficient calculation and process knowledge modification. This hierarchical multi-layer model is helpful in abnormality propagation path identification and root-cause analysis. Revised Likert scale method is adopted to determine the alarm priority and reduce the blindness of alarm handling. As a case study, the Tennessee Eastman process is utilized to show the effectiveness and validity of proposed approach. Alarm system performance comparison shows that our rationalization methodology can reduce the alarm flood to some extent and improve the performance. 展开更多
关键词 Alarm rationalization Root-cause analysis Alarm priority Interpretive structural modeling Likert scale Tennessee Eastman process
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An empirical study of the effects of a speaking anxiety reduction model developed from the rational emotive behavioral therapy
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作者 WANG Tian-jian Sarit Srikhao 《Sino-US English Teaching》 2010年第8期23-29,共7页
Thirty-two Chinese EFL learners took part in a true experiment on the effects of a Speaking Anxiety Reduction Model (SARM) developed from the Rational Emotive Behavioral Therapy (REBT). The participants were rando... Thirty-two Chinese EFL learners took part in a true experiment on the effects of a Speaking Anxiety Reduction Model (SARM) developed from the Rational Emotive Behavioral Therapy (REBT). The participants were randomly assigned to the treatment and the control group. Both groups received a pre- and post- test of their Speaking Anxiety (SA), Speaking State Anxiety (SAstate) as well as speaking performance. Those involved in the treatment group also received a treatment with the SARM between the tests. The results showed that, with the effects of Language Achievement (LA) being controlled: (1) the SARM could significantly reduce the SA, SAstate, and increase the total number of words in Communication Units (CUs); and (2) the effects of the SARM did not differ significantly in terms of gender. 展开更多
关键词 speaking anxiety reduction model rational emotive behavioral therapy EFFECTS
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On the Conflict between Rationality and Emotion in Seize the Day
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作者 赵宋华 《海外英语》 2014年第18期222-226,共5页
Saul Bellow'work mainly describes the human who cannot find the standpoint in American society, and they dangled between the ideal and the reality, insisting the belief of love. Seize the Day presents a several-ho... Saul Bellow'work mainly describes the human who cannot find the standpoint in American society, and they dangled between the ideal and the reality, insisting the belief of love. Seize the Day presents a several-hour experience of a middle-aged man who had lost his job, was estranged from his wife and children, and deserted by his father. With the double writing methods of narrative and recollection, the author reveals thriftily how individual was threatened by social prejudice and the important position of money. He extremely pays attention to the conflict between emotion and rationality to show people's anxiety and contradiction in today's America. 展开更多
关键词 CONFLICT emotION rationalITY
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A structural topological optimization method for multi-displacement constraints and any initial topology configuration 被引量:9
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作者 J. H. Rong J. H. Yi 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2010年第5期735-744,共10页
In density-based topological design, one expects that the final result consists of elements either black (solid material) or white (void), without any grey areas. Moreover, one also expects that the optimal topolo... In density-based topological design, one expects that the final result consists of elements either black (solid material) or white (void), without any grey areas. Moreover, one also expects that the optimal topology can be obtained by starting from any initial topology configuration. An improved structural topological optimization method for multidisplacement constraints is proposed in this paper. In the proposed method, the whole optimization process is divided into two optimization adjustment phases and a phase transferring step. Firstly, an optimization model is built to deal with the varied displacement limits, design space adjustments, and reasonable relations between the element stiffness matrix and mass and its element topology variable. Secondly, a procedure is proposed to solve the optimization problem formulated in the first optimization adjustment phase, by starting with a small design space and advancing to a larger deign space. The design space adjustments are automatic when the design domain needs expansions, in which the convergence of the proposed method will not be affected. The final topology obtained by the proposed procedure in the first optimization phase, can approach to the vicinity of the optimum topology. Then, a heuristic algorithm is given to improve the efficiency and make the designed structural topology black/white in both the phase transferring step and the second optimization adjustment phase. And the optimum topology can finally be obtained by the second phase optimization adjustments. Two examples are presented to show that the topologies obtained by the proposed method are of very good 0/1 design distribution property, and the computational efficiency is enhanced by reducing the element number of the design structural finite model during two optimization adjustment phases. And the examples also show that this method is robust and practicable. 展开更多
关键词 Topological optimization Displacement constraint Continuum structure Design space adjustment rational approximation material model
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基于Rational的B/S架构软件自动化测试研究 被引量:3
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作者 刘晓明 张桂珠 《计算机工程与设计》 CSCD 北大核心 2009年第24期5653-5657,共5页
为提高B/S架构下软件测试的自动化程度与执行效率,找出B/S架构下软件系统各项指标的性能瓶颈,提出应用优秀的软件自动化测试管理工具IBM Rational系列,构建优化的自动化测试模型,并应用该模型对当前最流行B/S架构的一个系统实例进行分... 为提高B/S架构下软件测试的自动化程度与执行效率,找出B/S架构下软件系统各项指标的性能瓶颈,提出应用优秀的软件自动化测试管理工具IBM Rational系列,构建优化的自动化测试模型,并应用该模型对当前最流行B/S架构的一个系统实例进行分析与测试管理。实验结果表明了它能够迅速发现软件中存在的缺陷,显著提高了B/S架构下应用系统自动化性能测试的效率,保证了软件的质量,对B/S架构软件自动化测试技术的深入研究具有重要的借鉴意义。 展开更多
关键词 软件测试 rational工具 B/S架构 自动化测试模型 性能测试
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Periodic Structures of Rossby Wave under Influence of Dissipation 被引量:2
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作者 CHEN Zhe LI Chong-Yin FU Zun-Tao 《Communications in Theoretical Physics》 SCIE CAS CSCD 2007年第1期35-40,共6页
A simple barotropic potential vorticity equation with the influence of dissipation is applied to investigate the nonlinear Rossby wave in a shear flow in the tropical atmophere. By the reduetive perturbation method, w... A simple barotropic potential vorticity equation with the influence of dissipation is applied to investigate the nonlinear Rossby wave in a shear flow in the tropical atmophere. By the reduetive perturbation method, we derive the rotational KdV (rKdV for short) equation. And then, with the help of Jaeobi elliptie functions, we obtain various periodic structures for these Rossby waves. It is shown that dissipation is very important for these periodic structures of rational form. 展开更多
关键词 rKdV equation elliptic equation Jacobi elliptic function periodic structure rational form
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DYNAMIC ANALYSIS OF UNDERGROUND COMPOSITE STRUCTURES UNDER EXPLOSION LOADING
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作者 赵晓兵 薛大为 赵玉祥 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 2004年第3期272-278,共7页
In selecting rational types of underground structures resisting explosion,in order to improve stress states of the structural section and make full use of material strength of each part of the section,the research met... In selecting rational types of underground structures resisting explosion,in order to improve stress states of the structural section and make full use of material strength of each part of the section,the research method of composite structures is presented. Adopting the analysis method of micro-section free body,equilibrium equations,constraint equations and deformation coordination equations are given. Making use of the concept of generalized work and directly introducing Lagrange multiplier specific in physical meaning,the validity of the constructed generalized functional is proved by using variation method. The rational rigidity matching relationship of composite structure section is presented through example calculations. 展开更多
关键词 composite structure dynamic analysis rational rigidity matching generalized variation principle
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Factor Structure and Measurement Invariance of the Prenatal Attachment Inventory: A Study among Japanese Pregnant Women
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作者 Kayoko Fujita Eliko Otsuki 《Open Journal of Nursing》 2021年第4期230-240,共11页
<strong>Background:</strong> Maternal emotional tie towards a foetus is a predictor of later maternal and child’s mental health. <strong>Methods:</strong> A questionnaire survey was conducted ... <strong>Background:</strong> Maternal emotional tie towards a foetus is a predictor of later maternal and child’s mental health. <strong>Methods:</strong> A questionnaire survey was conducted among 539 first trimester women. It included the Prenatal Attachment Inventory (PAI), Relationship Questionnaire (RQ), and Edinburgh Postnatal Depression Scale (EPDS). The factor structure models derived from exploratory factor analyses were compared by confirmatory factor analyses. <strong>Results:</strong> A three-factor bifactor model of the PAI was bet fit to the data. The omega coefficients and explained common variance suggested that the influences of three group factors were not negligible. The scores of the three subscales (derived from the three factors) were differently associated with age, gestation week, and adult attachment styles (derived from RQ). They were, however, not correlated with the EPDS scores. <strong>Conclusion:</strong> The PAI has a model of three groups and one general factor with an excellent fit to the data. The three subscales have construct validity too. 展开更多
关键词 Prenatal Attachment Inventory Maternal emotional Ties Factor structure Measurement Invariance
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An Approach to Representing Heterogeneous Non-Uniform Rational B-Spline Objects
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作者 臧婷 徐安平 《Transactions of Tianjin University》 EI CAS 2011年第4期275-279,共5页
The representation method of heterogeneous material information is one of the key technologies of heterogeneous object modeling, but almost all the existing methods cannot represent non-uniform rational B-spline (NU... The representation method of heterogeneous material information is one of the key technologies of heterogeneous object modeling, but almost all the existing methods cannot represent non-uniform rational B-spline (NURBS) entity. According to the characteristics of NURBS, a novel data structure, named NURBS material data structure, is proposed, in which the geometrical coordinates, weights and material coordinates of NURBS heterogene- ous objects can be represented simultaneously. Based on this data structure, both direct representation method and inverse construction method of heterogeneous NURBS objects are introduced. In the direct representation method, three forms of NURBS heterogeneous objects are introduced by giving the geometry and material information of con- trol points, among which the homogeneous coordinates form is employed for its brevity and easy programming. In the inverse construction method, continuous heterogeneous curves and surfaces can he obtained by interpolating discrete points and curves with specified material information. Some examples are given to show the effectiveness of the pro- posed methods. 展开更多
关键词 heterogeneous object non-uniform rational B-spline (NURBS) material data structure direct represen- tation method inverse construction method
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