Linearno i nelinearno sirenje ionsko-zvučnih valova u plazmi u posudi koja sadrži i negativne ione

Linear and nonlinear propagation of ion-acoustic waves are theoretically investigated in a multicomponent plasma consisting of electrons, positive ions and negative ions bounded in a cylindrical waveguide. The stability of the ion-acoustic wave is discussed taking into account the role of finite geometry and the concentration of negative ions of the plasma. The effect of nonlinearity on the ion-acoustic wave is investigated through the derivation of the effective potential (Sagdeev potential) and the results are discussed graphically with the variation of ion-streaming and the geometry of the bounded plasma.Teorijski istražujemo linearno i nelinearno širenje ionsko-zvučnih valova u višekomponentnoj plazmi koja se sastoji od elektrona, te pozitivnih i negativnih iona i nalazi se u valjkastom valovodu. Raspravljamo stabilnost ionsko-zvučnih valova uzimajućci u obzir utjecaj ograničenog prostora i koncentracije negativnih iona u plazmi. Istražujemo učinke nelinearnosti na ionsko-zvučni val putem izvođenja efektivnog (Sagdeevog) potencijala a ishodi numeričkih računa predočuju se grafički za različita strujanja iona i oblike valovoda

Linearno i nelinearno sirenje ionsko-zvučnih valova u plazmi u posudi koja sadrži i negativne ione

Linear and nonlinear propagation of ion-acoustic waves are theoretically investigated in a multicomponent plasma consisting of electrons, positive ions and negative ions bounded in a cylindrical waveguide. The stability of the ion-acoustic wave is discussed taking into account the role of finite geometry and the concentration of negative ions of the plasma. The effect of nonlinearity on the ion-acoustic wave is investigated through the derivation of the effective potential (Sagdeev potential) and the results are discussed graphically with the variation of ion-streaming and the geometry of the bounded plasma.Teorijski istražujemo linearno i nelinearno širenje ionsko-zvučnih valova u višekomponentnoj plazmi koja se sastoji od elektrona, te pozitivnih i negativnih iona i nalazi se u valjkastom valovodu. Raspravljamo stabilnost ionsko-zvučnih valova uzimajućci u obzir utjecaj ograničenog prostora i koncentracije negativnih iona u plazmi. Istražujemo učinke nelinearnosti na ionsko-zvučni val putem izvođenja efektivnog (Sagdeevog) potencijala a ishodi numeričkih računa predočuju se grafički za različita strujanja iona i oblike valovoda

Problem samofokusiranja i poprečne stabilnosti u magnetiziranoj plazmi s ionskom strujom

Self-focusing in a magnetized plasma consisting of cold electrons and ions has been studied in a situation when ions have a streaming velocity and the external magnetic field is at an angle µ with the streaming direction. By the use of a modified scaling, we have deduced an analogue of a non-linear Schrodinger equation involving only the space variables, which actually controls the transversal stability of the system, thus signaling the possibility of self-focusing. The various situations arising due to the variation of the propagation angle µ and the streaming velocity u0 are discussed in detail for the specific cases of D2 and N2 ions.Proučavamo samofokusiranje u magnetiziranoj plazmi koja se sastoji of hladnih elektrona i iona u uvjetima kada ioni struje a magnetsko je polje pod nekim kutom prema smjeru njihovog strujanja. Primjenom modificirane promjene mjera, izveli smo jednadžbu koja je analogna Schrodingerovoj jednadžbi s prostornim varijablama koja opisuje poprečnu stabilnost sustava i tako najavljuje mogućnost samofokusiranja. Raspravljaju se podrobno razni uvjeti koji nastaju zbog promjena smjera strujanja iona (kuta θ) i brzine strujanja (u0) za posebne slučajeve D2 i N2 iona

Problem samofokusiranja i poprečne stabilnosti u magnetiziranoj plazmi s ionskom strujom

Self-focusing in a magnetized plasma consisting of cold electrons and ions has been studied in a situation when ions have a streaming velocity and the external magnetic field is at an angle µ with the streaming direction. By the use of a modified scaling, we have deduced an analogue of a non-linear Schrodinger equation involving only the space variables, which actually controls the transversal stability of the system, thus signaling the possibility of self-focusing. The various situations arising due to the variation of the propagation angle µ and the streaming velocity u0 are discussed in detail for the specific cases of D2 and N2 ions.Proučavamo samofokusiranje u magnetiziranoj plazmi koja se sastoji of hladnih elektrona i iona u uvjetima kada ioni struje a magnetsko je polje pod nekim kutom prema smjeru njihovog strujanja. Primjenom modificirane promjene mjera, izveli smo jednadžbu koja je analogna Schrodingerovoj jednadžbi s prostornim varijablama koja opisuje poprečnu stabilnost sustava i tako najavljuje mogućnost samofokusiranja. Raspravljaju se podrobno razni uvjeti koji nastaju zbog promjena smjera strujanja iona (kuta θ) i brzine strujanja (u0) za posebne slučajeve D2 i N2 iona

Manas Kr. Mondal

ABSTRACT: A total of 18 lactating multiparous cows (4-6 years aged) were selected from the out patients at the Addl. Block Animal Health Center, Matiali Block, Jalpaiguri, West Bengal, India and divided into three group, i.e normally cyclic (C), repeat breeder (RB) and post partum anoestrous (A). Blood samples were collected from all these cows for haematological and biochemical parameters. Erythrocyte sedimentation rate (ESR) and total leukocyte count (TEC) count were higher (P<0.05) in repeat breeder and anoestrous cows compared to cyclic ones; however the Hb and PCV values were low (P<0.05). Serum glucose and protein levels were low (P<0.05) repeat breeding cows than the normally cyclic cows. The results indicate that there may not be any specific haemato-biochemical marker for common reproductive disorders in cows

Students’ Perception on CBCS Curriculum of Zoology at Undergraduate Level: An Opinion Survey of Students Under the Colleges of Vidyasagar University

Choice Based Credit System (CBCS) is a modern curriculum system of higher education in India which was first introduced by the Academic and Administrative Reforms committee of University Grant Commission (UGC) in 2008 headed by Prof. A. Gnanam. It is a system that promises to bring in holistic development of an individual by providing flexible and multi-disciplinary learning experience. The CBCS provides a cafeteria type approach in which the students can take courses of their choice, learn at their own pace, undergo additional courses and acquire more than the required credits, and adopt an interdisciplinary approach to learning. The courses shall be evaluated on the grading system, which is considered to be better than the conventional marks system. To make the present curriculum uniform, international standard and more developed UGC implement the Choice Based Credit System at higher education level. There are different Universities in the country that have adopted this system through modifying up to 30% of core papers’ syllabus under the proposed UGC curriculum. The major objectives of the study were to explore the nature of the present CBCS curriculum of Zoology and measure the perception level of the students on the present CBCS curriculum of Zoology of Vidyasagar University. The major Findings of the study were suggested that the Vidyasagar University followed the UGC recommended curriculum pattern for framing the CBCS curriculum of Zoology and it has also been found that there was no significant difference in the male and female students’’ perception about CBCS curriculum of zoology at undergraduate level in Vidyasagar University

Students’ Perception on CBCS Curriculum of Zoology at Undergraduate Level: An Opinion Survey of Students Under the Colleges of Vidyasagar University

Choice Based Credit System (CBCS) is a modern curriculum system of higher education in India which was first introduced by the Academic and Administrative Reforms committee of University Grant Commission (UGC) in 2008 headed by Prof. A. Gnanam. It is a system that promises to bring in holistic development of an individual by providing flexible and multi-disciplinary learning experience. The CBCS provides a cafeteria type approach in which the students can take courses of their choice, learn at their own pace, undergo additional courses and acquire more than the required credits, and adopt an interdisciplinary approach to learning. The courses shall be evaluated on the grading system, which is considered to be better than the conventional marks system. To make the present curriculum uniform, international standard and more developed UGC implement the Choice Based Credit System at higher education level. There are different Universities in the country that have adopted this system through modifying up to 30% of core papers’ syllabus under the proposed UGC curriculum. The major objectives of the study were to explore the nature of the present CBCS curriculum of Zoology and measure the perception level of the students on the present CBCS curriculum of Zoology of Vidyasagar University. The major Findings of the study were suggested that the Vidyasagar University followed the UGC recommended curriculum pattern for framing the CBCS curriculum of Zoology and it has also been found that there was no significant difference in the male and female students’’ perception about CBCS curriculum of zoology at undergraduate level in Vidyasagar University

Ross syndrome: a case report

Ross syndrome is a rare partial dysautonomic syndrome of unknown aetiology, characterized by segmental hypo/ anhidrosis associated with Holmes-Adie syndrome (tonic pupil and hypo/areflexia). The hypohydrosis or anhydrosis is patchy initially, later it becomes segmental or diffuse. This is due to affection of postganglionic cholinergic parasympathetic and sympathetic fibers involvement. There are a very few cases (approximately 50) have been reported in the literature since its original description. Author report a 22 years old male with classical features of Ross syndrome