Search for Quark-Lepton Compositeness at Tevatron and LHC

We make a Monte Carlo study on compositeness of first generation quarks and leptons using the Drell-Yan distribution in the high dielectron mass region at the Tevatron and LHC energies. The current experimental lower limits on the compositeness scale, \Lambda, vary from 2.5 to 6.1 TeV. In the present analysis, we assume that there will be no deviation of the dielectron mass spectrum from Standard Model prediction at center of mass energy 2 TeV (Tevatron) and 14 TeV (LHC). We then find that in the LL, RR, RL and LR chirality channels of the quark-electron currents, it is possible to extend the lower limits on \Lambda (at 95% {CL}) to a range of 6 to 10 TeV for 2 fb^{-1} and 9 to 19 TeV for 30 fb^{-1} of integrated luminosity at Tevatron. At LHC, the corresponding limits extend to a range of 16 to 25 TeV for 10 fb^{-1} and 20 to 36 TeV for 100 fb^{-1} of integrated luminosity

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

The magnetic behavior of Cu-Ni-Co-Fe quaternary alloys prepared by Mechanical alloying

The Cu-Ni-Co-Fe alloys with average grain size~10nm have been prepared by mechanical alloying. The ball milled and annealed samples were characterized by XRD, HRTEM and magnetic measurement. In the case of ball milled sample, superior magnetic properties have been achieved for sample comprising dispersed magnetic phases in Cu-rich matrix. In the case of annealed sample magnetic properties are improved due to precipitation of hard magnetic phase Co(fcc) from single phase Cu-rich solid solution

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

Shape and Size Controlled Deposition of ZnO Thin Films: Comparative Sensitivity towards Methane Gas

The effect of different solutes and solvents on the morphology of Galvanically deposited ZnO thin films is reported here. Hexagonal grains with c – axis orientation were obtained from aqueous Zn(NO3)2 bath (System A), whereas, the aqueous ZnSO4 bath (System B) yielded cages of ZnO flakes on the xy plane. Almost spherical grains with smaller sizes were obtained from the DMF bath of Zn(NO3)2 (System C). The highest average roughness (Ra) was shown by the flake like morphology (107.11 nm) and the lowest by the spherical one (16.82 nm). The value of Ra was 21.5 nm for System A. Surface roughness is responsible for adsorbing the test gas, one of the most important factors influencing the sensitivity. Same thing is reflected here by the deposited films for methane sensing. At 300 C, System B showed maximum efficiency (89 %) and the minimum was 69 %, as shown by System C. On the other hand, System A showed an inbetween value of efficiency of about 75 %. The response time at 300 C was also lowest for System B, whereas, System A & C showed similar values. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/3499

Closed Cell Aluminium Composite Foam for Crashworthiness Applications

Closed cell aluminium foams with various densities have been made through stir casting technique. The crucible temperature and melt temperature have been controlled to control the foaming temperature for controlling foam cell size and foam densities. The foam made has been then characterized for their micro-architectural characteristics as well as deformation responses. The crash of vehicle takes place at very high speed and therefore, the foams have been tested both at quasi-static and dynamic conditions. It is noted that at dynamic conditions the foams exhibit much higher strength and energy absorption. Then the foams have been filled manually inside the commercially available crash-box and tested using drop weight test methodology. The weight is varied up to 375 kg and speed is varied up to 55 km/h. The deformation behavior of bare foam blocks, foam filled crash box and empty crash boxes have been studied. It is observed that the foam synthesized through this technique is excellent for crash energy absorption. It is also noted that hardly any significant weight will be added into the vehicle. These closed cell foam has also the potential to be used in other transport sectors