Dark Matter and Collider Physics in Split-UED

Kaluza-Klein dark matter is an attractive weakly interacting massive particle in universal extra dimension model. In the recent extension "split-UED", annihilation of Kaluza-Klein dark matter with a mass range 600-1000 GeV provides excellent fits to the recently observed excesses in cosmic electron and positron fluxes of Pamela, ATIC and Fermi-LAT experiments. The cosmic gamma-ray flux in the same process can be significant around 300 GeV, thus can be observed or constrained by the forthcoming Fermi-LAT diffuse gamma-ray data. The collider signal at the LHC is the resonance in the dijets channels and the large missing energy in the missing energy plus jets.Comment: 3 pages, 6 figures, Talks given at 17th International Conference on Supersymmetry and the Unification of Fundamental Interactions (SUSY09), Boston, USA, 5-10 June 200

Split-UED and Dark Matter

Motivated by the recent observation of the high energy electron and positron excesses in cosmic ray by PAMELA and ATIC/PPB-BETS, we suggest an anomaly-free scenario for the universal extra dimension that localizes the SM quarks and splits the spectrum of KK quarks from KK leptons. When the SM quarks are "well localized" at the boundaries, the most stringent bound of the model ($1/R > 510$ GeV) comes from the resonance search for the Tevatron dijet channels. Even at the early stage of LHC, one can discover the second KK gluon for masses up to 4 TeV.Comment: 4 pages, 3 figures, 1 tabl

Generation differences in workplace values and strategies to minimize the conflict : A case study of Gano Excel Industries

Generational conflicts in values, perspectives, attitudes and behaviors are nothing new, but they can be difficult to reconcile in the workplace. Lack of attention to generational differences will make any company less efficient. So, this study used quantitative measures to investigate the generational differences in workplace values and qualitative measures to identify the strategies to minimize the conflict in Gano Excel Industries. Questionnaires were sent to local and oversea employees who come from Italy, Spain, Portugal, Cyprus, Netherland, France, Germany, Austria, United Kingdom, Romania and Turkey and 120 respondents participated in this survey. Interviews with 10 managers from the company were also done. There are R1, R2, R3 and R4 who are based in local office, while R5 from Italy, R6 from UK, R7 from Cyprus, R8 from Turkey, R9 from Romania and R10 from Netherland. Rokeach Values Surveys (RVS) by ranking scale had been used in this study to investigate the different work values of the employees from different generation. It is hope that the outcome of this study can be a benchmark for the management to improve Human Resources Management (HRM) and will be beneficial to the management employees, decision makers, researchers, academician, and also particular society in order to plan the effective ways to achieve work values of the employees in a company

Slip of fluid molecules on solid surfaces by surface diffusion

The mechanism of fluid slip on a solid surface has been linked to surface diffusion, by which mobile adsorbed fluid molecules perform hops between adsorption sites. However, slip velocity arising from this surface hopping mechanism has been estimated to be significantly lower than that observed experimentally. In this paper, we propose a re-adsorption mechanism for fluid slip. Slip velocity predictions via this mechanism show the improved agreement with experimental measurements

Effect of stirring on the safety of flammable liquid mixtures

Flash point is the most important variable employed to characterize fire and explosion hazard of liquids. The models developed for predicting the flash point of partially miscible mixtures in the literature to date are all based on the assumption of liquid-liquid equilibrium. In real-world environments, however, the liquid-liquid equilibrium assumption does not always hold, such as the collection or accumulation of waste solvents without stirring, where complete stirring for a period of time is usually used to ensure the liquid phases being in equilibrium. This study investigated the effect of stirring on the flash point behavior of binary partially miscible mixtures. Two series of partially miscible binary mixtures were employed to elucidate the effect of stirring. The first series was aqueous-organic mixtures, including water + 1-butanol, water + 2-butanol, water + isobutanol, water + 1-pentanol, and water + octane ; the second series was the mixtures of two flammable solvents, which included methanol + decane, methanol + 2,2,4-trimethylpentane, and methanol + octane. Results reveal that for binary aqueous-organic solutions the flash-point values of unstirred mixtures were located between those of the completely stirred mixtures and those of the flammable component. Therefore, risk assessment could be done based on the flammable component flash point value. However, for the assurance of safety, it is suggested to completely stir those mixtures before handling to reduce the risk

Syntheses and X-ray investigations within the system FeS₂-CoS₂

Pyrite (FeS2), cattierite (CoS2), and various transitional members of the solid solution compounds were prepared. The methods used are as follows: First, sulfides of cobalt, iron, or cobalt-iron were obtained by precipitation from a mixture of the cobalt chloride and/or ferrous sulfate in an aqueous solution. The dried precipitates were then mixed with an equal weight amount of sulfur and placed into silica glass tubes. After evacuation, they were filled with hydrogen gas of 3/4 of atmospheric pressure and sealed. The samples were then heated up to 500°C (for FeS2), 650°C (for FeS2-CoS2), and 750°C (for CoS2) for 24 to 72 hours. Pyrite, solid solutions of FeS2-CoS2, and cattierite were then formed. In addition, pyrite has also been synthesized by using the method of WOHLER (1836). This method is based on the direct reaction of S with Fe2O3 which are mixed in certain proportions and placed in an electric furnace at a constant temperature of 360°C. An amount of NH4Cl equal to that of Fe2O3 + S was also added to the mixture before heating. The time of heating was between 24 to 72 hours. The pyrite crystals so produced appeared as cubes, octahedra, pyritohedra and as their combinations. The density of natural pyrite could be changed through mechanical grinding. The finer the sample was ground the lower the density was. Therefore, the ratio of Fe to S changed from 1:1.994 to 1:1.945. This was calculated from the equation: nM=n(A + xB) = NoVd, where n is the theoretical number of atoms per unit cell (=4), A and B are atomic weights of elements in solid solution, No is the Avogadro’s number, V is the volume of the unit cell, and d is the density. Or, the number of atoms per unit cell, varied from n’ = 3.995 to n’ = 3.941 assuming that molecular weight is exactly FeS2 (calculated from the same equation: n’ = VdNo/A). Experiments on the detection of the decomposition of pyrites have also been made by using the X-ray diffraction method. The pyrites decomposed completely into pyrrhotite and sulfur at 625°C in a vacuum; however, the decomposition started well below 625°C e.g. at 400°C. The average lattice parameter of synthetic pyrite (5.40762 kX at 25°C) was slightly higher than that of the natural pyrites (5.40651 kX at 25°C). Yet, the linear thermal expansion coefficients of synthetic pyrite (average = 7.26 x 10-6 deg-1) did not differ much from those of the natural ones (8.52 to 9.25 x 10-6 deg-1) in spite of the variable crystal habit and the diverse localities of occurrence of the natural pyrites (cubes, pyritohedra, and octahedra of pyrite from the U. S., and Peru were used). The average lattice parameter of synthetic cattierite (CoS2) was 5.52508 kX at 25°C and the average linear thermal expansion coefficient was 13.76 x 10-6 deg-1. The components FeS2 and CoS2 formed a complete series of solid solutions at 650°C and the lattice parameter changed along a straight line from that of FeS2 to that of CoS2. --Abstract, pages ii-iv