Computational Study of the Optimum Gradient Magnetic Field for the Navigation of the Spherical Particles in the Process of Cleaning the Water from Heavy Metals

AbstractThe usage of magnetic spherical nanoparticles, coated with substances and driven to targeted areas in tanks, is proposed for cleaning the water from heavy metals. In the present paper, a computational study for the estimation of the optimum gradient magnetic field is presented in order to ensure the optimum driving of the particles into the targeted area. The optimization of the gradient magnetic field rates’ is verified with the particles’ deviation from a desired trajectory. Using the above mentioned method, it was depicted that with the increase of the optimization parameters number, the particles’ deviation from the desired trajectory is decreased

Measurement of the Quark and Gluon Fragmentation Functions in Z0 Hadronic Decays

The transverse, longitudinal and asymmetric components of the fragmentation function are measured from the inclusive charged particles produced in e+e- collisions at LEP. As in deep inelastic scattering, these data are important for tests of QCD. The transverse σΤ and longitudinal σL components of the total hadronic cross section σtot are evaluated from the measured fragmentation functions. They are found to be σΤ/σtot = 0.949 ± 0.001(stat.) ± 0.007(syst.) and σL/σtot = 0.051 ± 0.001(stat) ± 0.007(syst.) respectively. The strong coupling constant is calculated from σL/σtot in next-to-leading order of perturbative QCD, giving αs(Mz) = 0.120 ± 0.002(stat.) ± 0.013(syst.) ± 0.007(scale) .Including non-perturbative power corrections leads to αs(Mz) = 0.101 ± 0.002(stat.) ± 0.013(syst.) ± 0.007(scale) .The measured transverse and longitudinal components of the fragmentation function are used to estimate the mean charged multiplicity, 〈nch〉 = 21.21 ± 0.01(stat.) ± 0.20(syst.) The fragmentation functions and multiplicities in bb̄ and light quark events are compared. The measured transverse and longitudinal components of the fragmentation function allow the gluon fragmentation function to be evaluated.0SCOPUS: ar.jinfo:eu-repo/semantics/publishe

Measurement of the triple gluon vertex from double quark tagged four jet events

The 4-jet events collected by the DELPHI experiment at LEP1 in 1992, 1993 and 1994 are analysed to determine the contribution of the triple-gluon vertex. Two of the four jets are tagged as jets from $b$- or $c$-quarks using lifetime and lepton transverse momentum information. The 4-jet contributions from double-gluon bremsstrahlung, the triple-gluon vertex, and secondary quark-antiquark pair production then yield significantly different two-dimensional distributions in the generalized Nachtmann Reiter angle %$\Theta^{*}_{NR}$ versus the opening angle of the two secondary jets. These distributions are used to fit $C_A/C_F$, the ratio of the coupling strength of the triple-gluon vertex to that of gluon bremsstrahlung, and $N_C/N_A$, the ratio of the number of quark colours to the number of gluons, giving \begin{center} $C_A/C_F=2.51 \pm 0.28$ ~and~ $N_C/N_A=0.38 \pm 0.10$ \end{center} in agreement with the values expected from QCD: \begin{center} $C_A/C_F = 9/4 = 2.25$ ~and~ $N_C/N_A = 3/8 = 0.375$. \end{center

Search for B(s)0 anti-B(s)0 oscillations

Oscillations of Bs0 mesons were studied in events with a large transverse momentum lepton selected from 3.2 million hadronic Z0 decays registered by DELPHI between 1991 and 1994. A limit on the mass difference between the physical Bs0 states Δms > 6.5 ps−1 at 95% C.L. was obtained by combining the results obtained in three channels