Solution set calculation of the Sun-perturbed optimal two-impulse trans-lunar orbits using continuation theory

The solution set of the Sun-perturbed optimal two-impulse trans-lunar orbit is helpful for overall optimization of the lunar exploration mission.A model for computing the two-impulse trans-lunar orbit,which strictly satisfies the boundary constraints,is established.The solution set is computed first with a circular restricted three-body model using a generalized local gradient optimization algorithm and the strategy of design variable initial continuation.By taking the solution set of a circular restricted three-body model as the initial values of the design variables,the Sun-perturbed solution set is calculated based on the dynamic model continuation theory and traversal search methodology.A comparative analysis shows that the fuel cost may be reduced to some extent by considering the Sun’s perturbation and choosing an appropriate transfer window.Moreover,there are several optimal two-impulse trans-lunar methods for supporting a lunar mission to select a scenario with a certain ground measurement and to control the time cost.A fitted linear dependence relationship between the Sun’s befitting phase and the trans-lunar duration could thus provide a reference to select a low-fuel-cost trans-lunar injection window in an engineering project.

Timing theory continuous nursing,resistance training:Rehabilitation and mental health of caregivers and stroke patients with traumatic fractures

BACKGROUND Stroke is the leading cause of adult lifelong disability worldwide.A stroke is an acute cerebrovascular disease with a variety of causes and corresponding clinical symptoms.Around 75%of surviving stroke patients experience impaired nerve function,and some suffer from traumatic fractures,which can lead to special care needs.AIM To determine the effect of timing theory continuous care,with resistance training,on the rehabilitation and mental health of caregivers and stroke patients with traumatic fractures.METHODS Between January 2017 to March 2021,we selected 100 hospital admissions with post-stroke hemiplegia complicated with a traumatic fracture.Two participant groups were created:(1)Control group:given resistance training;and(2)Observation group:given timing theory continuous care combined with resistance training.The degree of satisfaction and differences in bone and phosphorus metabolism indexes between the two groups were compared.The self-perceived burden scale(SPBS)and caregiver burden questionnaire were used to evaluate the psychological health of patients and caregivers.The Harris hip function score,ability of daily living(ADL)scale,and global quality of life questionnaire(GQOL-74)were used to evaluate hip function,ability of daily living,and quality of life.RESULTS Data were collected prior to and after intervention.Alkaline phosphatase(ALP),osteocalcin,and vitamin D3 in the observation group and control group increased after intervention(P<0.05),and carboxy-terminal peptide of type I collagenβSpecial sequence(β-CTX)decreased(P<0.05).ALP and osteocalcin in the observation group were higher than in the control group(P<0.05).There was no significant difference inβ-CTX and vitamin D3 between the two groups(P>0.05).The SPBS score of the observation group was lower and the ADL score was higher than the control group.The burden score was lower and the Harris hip function and GQOL-74 scores were higher than that of the control group(P<0.05).The observation group’s satisfaction rating was 94.00%,which was higher than the rating from the control group(P<0.05).CONCLUSION Timing theory continuous nursing with resistance training can reduce hip dysfunction in stroke patients with a traumatic fracture and enhance quality of life and mental health of patients and caregivers.

Towards the East:Iran’s Foreign Policy in Ahmadinejad Era—Based on James Rosenau’s Continuity Theory

The article seeks to examine the East Look Policy(ELP)in Iran’s Foreign Policy(IFP)(2005-2013).We believe that states,due to different factors,may adopt different policies in their FP.So,the main research question is:Why did Iranian state adopt ELP in its FP in duration of Mahmoud Ahmadinejad era?With regard to the question,our hypothesis is“there are some factors in Iran’s internal environment that we called them micro-level factors and some variable in external environment that we called them macro-level variables in formation of ELP in IFP”.To prove this hypothesis,we use James Rosenau’s foreign policy theory that has been stood on two micro-and macrolevel analysis to examination of FP of any state.Regarding Rosenau’s theory,there are four factors on micro-level include:individual of policy-maker,his/her role in political system,social values,and governmental structure.In addition,in macro-level,there are some variables,such as the logic of anarchy,the action of other states(especially US),and nuclear sanctions imposed by the US and Western nations.

A damage-based constitutive model for rock under impacting load

Using the Splitting Hopkinson Pressure Bar （SHPB） experimental system, investigations were made into the dynamic mechanical performances of underground soft rocks. The experiments proved that the measured stress-strain curves display the characteristics of plastic deformation. By making use of a revised overstress constitutive formula for the stress model and by taking into account that the strain rate and strain are a function of I - E（t）/Eo, a revised overstress constitutive formula for the stress model was simplified by applying dimensional analysis and consequently, a simplified overstress formula was obtained for the stress model. Then, by taking into consideration the effects of damage under a dynamic load on the dynamic loading strength of the rock, the continuous damage theory and the statistical strength theory were introduced into the development of the simplified overstress constitutive formula for the stress model. Hence, a damage-based constitutive formula for an overstress model, which can be appropriately applied to the analysis of full dynamic stress-strain curves, was developed. By using the simplified damage-based constitutive formula for an overstress model, the actually measured curves are fitted, indicating that the fitting curves and those actually measured are in good agreement.

Existence of Two Periodic Solutions of a Delayed Single Species Model with Feedback Regulation and Harvest Term

By means of the continuation theorem of the coincidence degree theory,the existence of two periodic solutions of a delayed single species model with feedback regulation and harvest term is obtained.

Who is the ＂Rightful＂ Inheritor of Ancient Culture？ Ancient Greece, Modern Greece, and Richard Wagner

The purpose of this paper is to analyze the reception of Wagner＇s approaches to Greek antiquity by Greek musicologists and composers which took place at the first half of the 20th century. Wagner＇s such readings were parts of wider narrations of archeology and how Greeks perceived their past.This research is largely based on primary sources of that time; its arguments construct two levels of critique： （1） Admiration （the ＇proper＇ aesthetic examples are German models, as exemplified in Wagner＇s work）; and （2） ＂Hellenism＂ as a means to distancing from Wagner （The past of ancient Greece is still believed to be better understood by the Greeks）. The principal conclusions are： （1） Wagner＇s views were admired because Wagner＇s example （ancient culture） should also be an example for Greek composers; and （2） Wagner＇s views were judged on the grounds of： Ideology： the expression of the ＂soul＂; the theory of ＂historic continuity＂; the balance between music, poetry, and dance; Wagner gave superiority to music, modem Greeks （should） give a predominant role to language as a means of expression in an ancient drama, or achieve a balance among the three arts of music, poetry, and dance.

On Chinese Civilization Being the Only Continued Civilization in the Viewpoint of the Modern National History Construction

Chinese civilization is the only ancient civilization thriving to this day seems to be a common view in the historical academia and Chinese society as well. Culture is a way that human beings actively adapt to the surroundings and keep consistence with environmental change. All cultures created by human beings are changing, so is the Chinese culture. The physical and cultural evolution presented by the archaeological discoveries and related historical researches show that Chinese culture is multi-sourced and multicultural. This is the secret for the Chinese culture to retain its vitality. The reasons that Chinese civilization is the only civilization thriving to this day among all of ancient civilizations in the world include the ancestral worship, the identity to common ancestors, traditions of writing pedigrees and history books, the longhistory Chinese character system and the creative thinking and cultural methods of interpreting new thoughts by using traditional Chinese thinking and cultural structures. Especially in modern times, impacted by the nationalism trend, the national state narration built for meeting the requirement of the national state"historical memory"left us the strong impression of Chinese civilization being the only continued civilization and fostered the affective identification with the common history.

Generative Mechanisms of Classroom Silence and the Path of Avoidance

Classroom silence is complex and discrete problem.It affects the overall teaching and learning quality as well as the high-quality development of both teachers and students.Avoiding classroom silence is a highly dynamic and valuable learning process.This study explores the ecological logic of classroom silence of both teachers and students based on the connotation of classroom silence and deconstructs the endogenous and exogenous mechanisms of classroom silence from the perspectives of escape culture and the continuity theory.Following that,we construct a new model of interaction for elementary school classroom,which includes optimizing the teaching evaluation tools,creating a multidimensional physical technology environment,and fostering an interactive culture of returning to the classroom,so as to promote the overall classroom effectiveness.

Multiple positive periodic solutions for a generalized delayed population model with an exploited term

In this paper, the existence of two positive periodic solutions for a generalized delayed population model with an exploited term is established by using the continuation theorem of the coincidence degree theory.