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Drift Effects on Plasma Waves

Thesis Info

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Author

Bashir, Muhammad Fraz

Program

PhD

Institute

Government College University

City

Lahore

Province

Punjab

Country

Pakistan

Thesis Completing Year

2014

Thesis Completion Status

Completed

Subject

Physics

Language

English

Link

http://prr.hec.gov.pk/jspui/bitstream/123456789/2224/1/2774S.pdf

Added

2021-02-17 19:49:13

Modified

2024-03-24 20:25:49

ARI ID

1676725925802

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The full kinetic dispersion relation for the Geodesic acoustic modes (GAMs) including diamagnetic effects due to inhomogeneous plasma density and temperature is derived by using the drift kinetic theory. The fluid model including the effects of ion parallel viscosity (pressure anisotropy) is also presented that allows to recover exactly the adiabatic index obtained in kinetic theory. We show that diamagnetic effects lead to the positive up-shift of the GAM frequency and appearance of the second (lower frequency) branch related to the drift frequency. The latter is a result of modification of the degenerate (zero frequency) zonal flow branch which acquires a finite frequency or becomes unstable in regions of high temperature gradients. By using the full electromagnetic drift kinetic equations for electrons and ions, the general dispersion relation for geodesic acoustic modes (GAMs) is derived incorporating the electromagnetic effects. It is shown that m=1 harmonic of the GAM mode has a finite electromagnetic component. The electromagnetic corrections appear for finite values of the radial wave numbers and modify the GAM frequency. The effects of plasma pressure βe, the safety factor q and the temperature ratio τ on GAM dispersion are analyzed. Using the quantum hydrodynamical model of plasmas, the stability analysis of self-gravitational electrostatic drift waves for a streaming non-uniform quantum dusty magneto-plasma is presented. For two different frequency domains i.e., Ω0d<<ω<Ω0i (unmagnetized dust) and ω<< Ω0d < Ω0i (magnetized dust), we simplify the general dispersion relation for self-gravitational electrostatic drift waves which incorporates the effects of density inhomogeneity ∇n0α, streaming velocity v0α due to magnetic field inhomogeneity ∇B0, Bohm potential and the Fermi degenerate pressure. For the unmagnetized case, the drift waves may become unstable under appropriate conditions giving rise to Jeans instability. The modified threshold condition is also determined for instability by using the intersection method for solving the cubic equation. We note that the inhomogeneity in magnetic field (equilibrium density) through streaming velocity (diamagnetic drift velocity) suppress the Jeans instability depending upon the characteristic scale length of these inhomogeneities. On the other hand, the dust-lower- hybrid wave and the quantum mechanical effects of electrons tend to reduce the growth rate as expected. A number of special cases are also discussed.
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باراں ماہ: وکھو وکھ

باراں ماہ
چیتر

چڑھدے چیتر نوں مہکدے باغ بوٹے، لگے پھل سب پتیاں ڈالیاں نوں

موسم بدلے آئی بہار سوہنی، آساں لگیاں آن کے مالیاں نوں

پھلاں وانگ خوشبوواں دے یار جانی، دیندے وصل نصیباں والیاں نوں
ملیں آن غریب حنیف تائیں، دسیں پال پریم پیالیاں نوں
وساکھ

وسدی جھوک اجاڑ پیریں، آپ پکڑ کوہاڑیاں ماریاں نی

نگاہ تیز دے کٹھڑے ہوئے عاشق، نیناں چاہڑیاں کٹک خماریاں نی

ایس عشق جنون تھیں باز آویں، روک رہیاں خلقتاں ساریاں نی

رکھیں یاد حنیف نوں مارنا ایں، ایہہ واریاں یار ادھاریاں نی
جیٹھ

جیٹھ جان عذاب وچ پھس گئی اے، تتیاں گرم ہواواں چلیاں نی

ہک ہجر ساڑے، دوجا غم مارے، جھوٹے دیوندے لوگ تسلیاں نی

ہک پلک وی یاد نہ بھلدی اے، بیٹھے دل وچ مار پتھلیاں نی

پھیرا گھت حنیف پردیسیاں تے، تدھ باہجھ سب سنجیاں گلیاں نی
ہاڑ

ہائے گرمی کر زور آئی، چلن پھرن تھیں خلق بیزار ہوئی

دنیا والڑے دے گئے بُھل چیتے، گئی عقل تے مت، خوار آئی

جیوندے جی ہک وار جے مل جاویں، خواہش ملن دی لکھ ہزار ہوئی

خواہشاں ساریاں پوریاں ہون ناہیں، ہر خواہش تے جان بے قرار ہوئی

ساون

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ندی نالیاں وچ ترنگ آیا، ہوئیاں رحمتاں بے شماریاں نی

رکھن لج حنیف لج پال اوڑک، جیہڑے پال وکھاوندے یاریاں نی
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أهمية النصيحة في الكتاب والسنة

The advice is a direct and sincere word, and has a high place in the reform of individuals and nations. It is one of the greatest means of communication and influence through centuries and generations. This word carries the meaning of sincerity, honesty, serenity, openness and purity. The advice is to help the right, obey the command of Allah and the Sunnah of the Messenger of Allah, and therefore we find the heavenly vocations are all concerned with the advice of various aspects of the reform of the prophesies to him, And to reform the corrupt nations. Godly advice has the potential to grow your faith and strengthen your relationship with God, but bad advice can ruin things in one move. Some advice is good, noble even. Some is neutral, more of a preferential decision. But some advice is flat out wrong for someone seeking to live a holy life.

Comparativegrowthperformanceand Morphologicalvariationsanalysisbetween Two Populationsof Cirrhinus Mrigala from Chenab and Indus Rivers

In Pakistan there exist huge potential for development of aquaculture particularly inland fisheries sector but due to couple of reasons this field could not flourished in Pakistan. Cirrhinus mrigala is extensively cultured major carp among other major carps but there is no documentation concerning the analyses of Cirrhinus mrigala from Chenab River and Indus River for stock identification and conservation purposes. Length-weight and length-length relationships, condition factor, stock structure and morphological heterogeneity of Cirrhinus mrigala from Chenab River and Indus River were studied using traditional morphometric techniques; landmark (Truss) based geometric morphometric analysis and meristic analysis. A total of 248 samples were collected, 124 samples from each river. The higher value of regression coefficient ?b? from Indus river (b = 3.130) than regression coefficient ?b? value form Chenab River (b = 2.9875) indicated that Cirrhinus mrigala in Indus River shows comparatively better growth as compared to Chenab River. Length-weight relationships of Cirrhinus mrigala are suggestive that the wild conditions in Indus River at Taunsa Barrage are much suitable for rearing and stocking purposes instead in Chenab River at Head Muhammad Wala. Fulton?s condition factor (K) for Cirrhinus mrigala in Chenab River has shown a decreasing (negative) trend, while for the Indus River it showed an increasing (positive) trend. The higher evaluated level of Fulton?s condition factor for the population of Cirrhinus mrigala in the Indus River than the Chenab River population symbolizes the superior ecological conditions, foraging conditions, health and hygienic conditions in the Indus River at Taunsa Barrage. Discriminant function analysis on 21 landmark based geometric variables and 11 traditional morphometric variables disclosed that phenotypical variations are predominantly exist as Intra-population variations rather than inter-population variations. Final classification results in Discriminant function analysis, accounts that 67.7% of original grouped cases were correctly classified and 56.5% of cross-validated grouped cases were correctly classified. The equal discriminatory power of the discriminant function I (DFI) centred on discriminant function analysis for the both populations of Cirrhinus mrigala at Chenab River and the Indus River and non-significant (H) value of Kruskal-Wallis test patently represents the absence of statistically significant meristic variations between the two populations. Discriminant functional analysis and meristic analysis are of suggestive that there exists much merger and gene flow between two populations owing to weak geographical isolation between two rivers.