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Linear and Nonlinear Dynamics of Space and Laboratory Plasma

Thesis Info

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Author

Ullah, Zakir

Program

PhD

Institute

University of Peshawar

City

Peshawar

Province

KPK

Country

Pakistan

Thesis Completing Year

2016

Thesis Completion Status

Completed

Subject

Physics

Language

English

Link

http://prr.hec.gov.pk/jspui/bitstream/123456789/13040/1/Zakir_Ullah_Physics_HSR_2016_UoP_Peshawar_06.08.2018.pdf

Added

2021-02-17 19:49:13

Modified

2024-03-24 20:25:49

ARI ID

1676726584597

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Linear and non-linear dynamics of di erent electrostatic modes is studied in inhomoge- neous, magnetized and non-Maxwellian plasmas. A linear dispersion relation is obtained for the Ion Temperature Gradient (ITG) mode and numerically analyzed in the presence of dust charge uctuations and Kappa distributed electrons. It is found that these nonthermal pop- ulations reduce the growth rate ITG. It is also noticed that the characteristics of ITG driven vortices change with the value of spectral index, inhomogeneities, scale lengths and dust charge uctuations. Electron Temperature Gradient (ETG) mode is investigated in a collisionless plasma with Kappa distributed ions. Di erent aspects of the ETG-mode are discussed and noticed that these are modi ed with the superthermality e ect of ions e.g., the phase velocity of the ETG- mode. In the nonlinear regime, we found the ETG mode driven vortex structures, where we noticed that the vortex speed and the amplitude changes with the Kappa value and the ion to electron temperature ratio. Further, the ETG mode is discussed by including the parallel electron dynamics. It is noticed that the parallel motion of electrons stabilizes the ETG instability. Thus the possibility of the formation of nonlinear vortex structures increase. These investigations are discussed both for circular and elliptic type dipolar vortices. In this model an eigen mode dispersion relation is also obtained in the ballooning limit. This relation is also modi ed in the presence of non- Maxwellian ions. Electron AcousticWaves (EAW) are studied with non-Maxwellian hot electrons and stationary/non- stationary ions. In this investigation, both the linear and nonlinear propagation of EAW with stationary and non-stationary ions are discussed. It is noticed that the behavior of EAW is di erent for Kappa distributed hot electrons and Cairn''s distributed hot electrons. Superthermality e ect of electrons and ions on the dust charge uctuations and on the low frequency dust drift/acoustic waves is investigated in an inhomogeneous dusty plasma. It is noticed that this superthermality e ect of ions and electrons reduces the growth rate of the instability due to dust charge uctuations. It is found that dust charge and the superthermalty e ect of ion and electrons reduce the growth rate of instability. In the nonlinear regime, the condition for the existence of dust drift/ acoustic wave driven vortices modi es due to spectral index Kappa. Further, we have investigated the ITG driven solitons and shocks for the electron-ion plasmas for thest time. In this case, it is noticed that the amplitude of the soliton decreases and width of the soliton increases with the increase in ion temperature. In the case of dissipated electron- ion plasmas, the amplitude of the shock increases for with an increase in thei value.
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کتابیات

مصادرومراجع
بنیادی مآخذ
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ثانوی مآخذ
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۱۰۔انوار ظہوری، سید: ’’حرف منزہ ‘‘(ظہوری اکیڈمی، لاہور) ۱۹۹۳ء
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۱۵۔حفیظ صدیقی، ابوالاعجاز: ’’کشاف تنقیدی اصطلاحات ‘‘(مقتدرہ قومی زبان، اسلام آباد) ۱۹۸۵ء
۱۶۔راجا رشید محمود: ’’اقامت نعت‘‘(مدنی گرافکس ،لاہور) ۲۰۱۲ء
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۱۸۔ریاض سہروردی:’’ارمغان ریاض سہروردی‘‘ مرتبہ :ڈاکٹر شہزاداحمد،۲۰۱۴
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Daily Stressors, Coping Strategies and Adjustment of Adolescents

This study was initiated to identify the daily stressors, coping strategies and adjustment of adolescents. It was a two phased study. In Phase I, a pilot study was conducted on thirty two adolescents who were between 14 to 18 years of age, to establish the applicability of the instruments to be used for the final study and also to have a preliminary sense of the qualitative and quantitative aspects of the research. In Phase II, two studies were conducted. In Study A, Situational COPE (Carver & Scheier, 1982), was used to identify daily stressors and coping strategies. Perceived Self Efficacy Scale (Jerusalem & Schwarzer, 1979) was used as an indicator of adjustment. 435 (249 females, 186 males) school/college students participated in this study. Their age ranged between 14 and 19 years (M= 16.84). Content analysis of reported stressors revealed four major stressful domains: Academics, Interpersonal, Intra personal and Socio-environmental. Religious Coping, Planning, Positive Reinterpretation and Growth, Focus on and Venting of Emotions emerged as the most dominant coping strategies. The less opted strategies were Substance Use and Humor. Problem-Focused coping dominated over Emotion-Focused or Dysfunctional coping types. Frequency of stressors demonstrates that females were more stressed in the domains of academics and interpersonal relations and males were more stressed in socio-environmental domain. Intrapersonal stressors were reported equally by both genders. Likewise, intrapersonal stressors were less in early adolescents and high in mid adolescents; interpersonal stressors were reported equally by all age groups. Similarly, academic stressors were more pronounced in early adolescents and less in older adolescents; socio-environmental stressors, however, increased with age. Analysis of variance (ANOVA) was conducted, to see the main effects of gender on different COPE scales. Significant gender differences were found on four sub-scales: Religious Coping [F(1,434)= 3.86, p< .05], Humor [F(1,434)= 6.45, p= .05], Behavior Disengagement [F(1,434)= 5.95, p< .05], and Substance Use [F(1,434)= 4.49, p< .05]. Females scored high on Religious Coping and Behavioral Disengagement and males scored high on Humor and Substance Use. ANOVA was also computed to see age effects and significant differences were found on three COPE sub-scales. On Focus on and Venting of Emotions, adolescents in their mid years vented off their emotions more [F(2,434)= 3.35, p< .05], Denial [F(2,434)=3.45, p< .05] was more among older adolescents and Acceptance [F(2,434)= 4.34, p< .05] increased with age. The perceived Self-efficacy among adolescents was also high and it was positively correlated with Problem-focused coping. In Study B, thirty participants (15 males, 15 females), 17 to 19 years of age were studied repeatedly for six weeks. Initially Dispositional COPE (Carver & Scheier, 1982) was given to them to see their usual coping pattern. Then, diary method was used to identify their daily stressors and Situational COPE was used to assess coping. A qualitative analysis was carried out, individual patterns emerged and each pattern did not match largely with the reported dispositional style coping of those individuals, hence preference for certain coping strategies did emerge. Gender comparison was also done and both males and females exhibited coping with stressful situations in a variety of ways. Active coping, Planning, Acceptance, Religious Coping, Mental or Behavioral Disengagement, Focus on and Venting of Emotions were the most dominant coping strategies for stressors related to academics, interpersonal, intrapersonal and socio-environmental domains.