Search for dark matter produced in association with a hadronically decaying vector boson in pp collisions at sqrt (s) = 13 TeV with the ATLAS detector

A search is presented for dark matter produced in association with a hadronically decaying W or Z boson using 3.2 fb−1 of pp collisions at View the MathML sources=13 TeV recorded by the ATLAS detector at the Large Hadron Collider. Events with a hadronic jet compatible with a W or Z boson and with large missing transverse momentum are analysed. The data are consistent with the Standard Model predictions and are interpreted in terms of both an effective field theory and a simplified model containing dark matter

Integral transform method

AbstractThe finite integral transform technique is interpreted as a powerful new general-purpose numerical method. The method transforms nonlinear partial differential equation models to a coupled nonlinear system of ordinary differential equations to be solved numerically. One class of heat diffusion problems is considered, but the method is applicable to other models. A new approach for the derivation of the corresponding system of ordinary differential equations is used, and three examples are given

Kinetic And Reactor Models For Hdt Of Middle Distillates

Hydrodesulfurization (HDS) and hydrodenitrogenation (HDN) of middle distillates over a commercial Ni-Mo/γ-Al 2O 3) have been studied under wide operating conditions (340 to 380°C and 38 to 98 atm), A Power Law model was presented to each one of those reactions. The parameters of kinetic equations were estimated solving the ordinary differential equations by the 4 th order Runge-Kutta-Gill algorithm and Marquardt method for searching the set of kinetic parameters (kinetic constants as well as the order of the reactions). An adiabatic diesel hydrotreating tricklebed reactor packed with the same catalyst was simulated numerically in order to check up the behavior of this reaction system. One dimensional pseudo-homogeneous model was used in this work. For each feed, the mass and energy balance equations were integrated along the length of the catalytic bed using the 4 th Runge-Kutta-Gill method. The performances oftwo industrial reactors were checked. © 1999 Elsevier Science Ltd.23SUPPL. 1S791S794Girgis, M.J., Gates, B.C., Reviews Reactivities, Reaction Networks, and Kinetics in High-Pressure Catalytic Hydroprocessing (1991) Ind. Eng. Chern. Res., 30, pp. 2021-2058Marquardt, D.M., An Algorithm for Least Squares Estimation ofNonlinear Parameters (1963) J. Soc Indust. AppJ. Math., 11 (2), pp. 431-441Tarhan, M.O., (1983) Catalytic Reactor Design, , McGraw-Hili, Inc. New YorkSatterfield, C.N., Pelosof, A.A., Sherwoord, T.K., Mass Tranfer Limitations in a Trickle Bed Reactor (1969) AIChe, 1 (15), pp. 226-23

A comparison of concentration measurement techniques for the estimation of the apparent mass diffusion coefficient

In this article we compare two different techniques to measure the concentration of saline solutions for the identification of the apparent mass diffusion coefficient in soils saturated with distilled water. They are the radiation measurement technique and the electrical conductivity measurement technique. These techniques are compared in terms of measured quantities, sensitivity coefficients with respect to unknown parameters and the determinant of the information matrix. The apparent mass diffusion coefficient is estimated by utilizing simulated measurements containing random errors. The Levenberg-Marquardt method of minimization of the least-squares norm is used as the parameter estimation procedure. The effects of the volume of saline solution injected into the column devised for the experiments on the accuracy of the estimated parameters are also addressed in this article