Short term pulse frequency fluctuations of OAO 1657-415 from RXTE observations

We present new X-ray observations of the high mass X-ray binary (HMXRB) pulsar OAO 1657-415, obtained during one orbital period (10.44 days) with the Rossi X-Ray Timing Explorer (RXTE). Using the binary orbital parameters, obtained from Burst and Transient Source Experiment (BATSE) observations, we resolve the fluctuations in the pulse frequency at time scales on the order of one day for the first time. Recent BATSE results showed that OAO 1657-415 has spin-up/down trends in its pulse frequency time series, without any correlation with the X-luminosity at energies $>$20 keV (Baykal 1997). In the present RXTE observations the source is found to be in an extended phase of spin-down. We also find a gradual increase in the X-ray luminosity which is correlated with a marginal spin-up episode. The marginal correlation between the gradual spin-up (or decrease in spin-down rate) and increase in X-ray luminosity suggests that the OAO 1657-415 is observed during a stable accretion episode where the prograde accretion disk is formed.Comment: MNRAS (2000), vol 313, 63

Energy efficiency interventions in UK higher education institutions

This paper provides an insight into energy efficiency interventions studies, focusing on issues arising in UK higher education institutions (HEIs) in particular Based on a review of the context for energy efficiency and carbon reduction programmes in the UK and the trends in higher education sector, existing external and internal policies and initiatives and their relevant issues are extensively discussed To explore the efficacy of some internal intervention strategies, such as technical, non-technical and management interventions, a survey was conducted among UK higher education institutions between February and April 2008 Consultation responses show that there are a relatively high percentage of institutions (83%) that have embarked on both technical and non-technical initiatives, which is a demonstration to the joined-up approach in such area Major barriers for intervention studies are also identified, including lack of methodology, non-clarity of energy demand and consumption issues, difficulty in establishing assessment boundaries, problems with regards to indices and their effectiveness and so on Besides establishing clear targets for carbon reductions within the sector, it is concluded that it is important to develop systems for effectively measuring and evaluating the Impact of different policies, regulations and schemes in the future as the first step to explore (C) 2010 Elsevier Ltd All rights reserve

Prospects of New Physics searches using High Lumi - LHC

After the observation of a Higgs boson near 125 GeV, the high energy physics community is investigating possible next steps for entering into a new era in particle physics. It is planned that the Large Hadron Collider will deliver an integrated luminosity of up to 3000/fb for the CMS and ATLAS experiments, requiring several upgrades for all detectors. The reach of various representative searches for supersymmetry and exotica physics with the upgraded detectors are discussed in this context, where a very high instantaneous luminosity will lead to a large number of pileup events in each bunch crossing. This note presents example benchmark studies for new physics prospects with the upgraded ATLAS and CMS detectors at a centre-of-mass energy of 14 TeV. Results are shown for an integrated luminosity of 300/fb and 3000/fb.Comment: Plenary talk presented at Next Steps in the Energy Frontier - Hadron Colliders Workshop, August 2014 - Fermi National Lab (FNAL). On behalf of the ATLAS and CMS Collaboration

Search for R-Parity Violating Supersymmetry at the CMS Experiment

The latest results from CMS on R-Parity violating Supersymmetry based on the 19.5/fb full dataset from the 8 TeV LHC run of 2012 are reviewed. The results are interpreted in the context of simplified models with multilepton and b-quark jets signatures that have low missing transverse energy arising from light top-squark pair with R-parity-violating decays of the lightest supersymmetric particle. In addition to simplified model, a new approach for phenomenological MSSM interpretation is shown which demonstrates that the obtained results from multilepton final states are valid for a wide range of supersymmetry models.Comment: 6 pages, 10 figures, EPS-2013 July 17-24, Stockholm, Swede

Simulation and Efficiency Studies of Optical Photon Transportation and Detection with Plastic Antineutrino Detector Modules

In this work, the simulation of optical photons is carried out in an antineutrino detector module consisting of a plastic scintillator connected to light guides and photomultipliers on both ends, which is considered to be used for remote reactor monitoring in the field of nuclear safety. Using Monte Carlo (MC) based GEANT4 simulation, numerous parameters influencing the light collection and thereby the energy resolution of the antineutrino detector module are studied: e.g., degrees of scintillator surface roughness, reflector type, and its ap- plying method onto scintillator and light guide surface, the reflectivity of the reflector, light guide geometries and diameter of the photocathode. The impact of each parameter is inves- tigated by looking at the detected spectrum, i.e. the number photoelectrons per depositing energy. In addition, the average light collection efficiency of the detector module and its spatial variation are calculated for each simulation setup. According to the simulation re- sults, it is found that photocathode size, light guide shape, reflectivity of reflecting material and wrapping method show a significant impact on the light collection efficiency while scin- tillator surface polishing level and the choose of reflector type show relatively less impact. This study demonstrates that these parameters are very important in the design of plastic scintillator included antineutrino detectors to improve the energy resolution efficiency

A usage based approach into the acquisition of relative clauses

ABSTRACT: Previous research has shown that cross-linguistically relative clauses are acquired late and are considered as a signal of linguistic complexity. This study adapts a usage-based account of relative clause acquisition in Turkish. A corpus based on three databases including 170 recordings of naturalistic mother-child interaction was analysed. The age of children in these three databases are 02;00-03;06, 01;00-02;04 and 00;09-02;09, respectively. The analyses revealed that the use of relative clauses in both the children’s productions and in child-directed speech were extremely scarce. Though previous research underlined the linguistic complexity of relative clauses as a reason for late acquisition, the results of this study point out that scarcity of input should also be regarded as a powerful predictor. The study underlines the availability of other constructions that are functionally parallel to relative clauses. The findings suggest that such structures which are syntactically and morphologically less complex than relative clauses are common in both child directed speech and in children’s productions

Gelişmekte olan piyasalarda enerji tüketimi ve büyüme ilişkisinin panel kantil regresyon ile incelenmesi: VISTA ülkeleri örneği

Energy consumption and economic growth relationship is an important topic for global economy. Most of researchers investigated this relationship with different methods on different macro-economic data. These methods are including not only time-series econometrics but also panel data analysis. Moreover, they analyzed different countries or country groups classified by OECD, World Bank or any other economic organizations. The aim of study is the relationship between energy consumption and economic growth with panel quantile regression method on VISTA countries (Vietnam, Indonesia, South Africa, Turkey and Argentina). Estimations are made annually for 1985 – 2013 period. Dependent variable is GDP per capita growth and independent variables are logarithmic energy consumption indicators which are Oil Consumption, Coal Consumption, Hydroelectricity Consumption and Primary Energy Consumption. Results show that the effects of logarithmic energy consumption variables are changing on economic growth for different quantiles (τ = 0.25; 0.50; 0.75; 0.90). In conclusion, effect of oil consumption on economic growth is falling at high quantiles of GDP growth. In contrast, effect of hydroelectricity consumption and primary energy consumption on economic growth is rising at high quantiles. But, there is not a statistical significant effect of coal consumption on economic growth at any quantile

Comparison of Plastic Antineutrino Detector Designs in the Context of Near Field Reactor Monitoring

We compare existing segmented plastic antineutrino detectors with our new geometrically improved design for antineutrino detection and light collection efficiency. The purpose of this study is to determine the most suitable design style for remote reactor monitoring in the context of nuclear safeguards. Using Monte Carlo based GEANT4 simulation package, we perform detector simulation based on two prominent experiments: Plastic antineutrino detector array (Panda) and Core monitoring by reactor antineutrino detector (Cormorad). In addition to these two well-known designs, another concept, the Panda2, can be obtained by making a small variation of Panda detector, is also considered in the simulation. The results show that the light collection efficiency of the Cormorad is substantially less with respect to the other two detectors while the highest antineutrino detection efficiency is achieved with the Cormorad and Panda2. Furthermore, as an alternative to these design choices, which are composed of an array of identical rectangular-shaped modules, we propose to combine regular hexagonal-shaped modules which minimizes the surface area of the whole detector and consequently reduces the number of optical readout channels considerably. With this approach, it is possible to obtain a detector configuration with a slightly higher detection efficiency with respect to the Panda design and a better energy resolution detector compared to the Cormorad design