10,864 research outputs found
Sectoral Employment Efkcts of Trade and ProductiviQ in a Small Open Economy
This paper assesses the impact of trade and technology on Belgian industrial employment. A framework is developed which incorporates employment effects of (i) export expansion (ii) impost competition and (iii) labour saving productivity improvements. In this context, evidence is found for the hypothesis that international trade induces adjustments in technology.
The Supersymmetric Fine-Tuning Problem and TeV-Scale Exotic Scalars
A general framework is presented for supersymmetric theories that do not
suffer from fine-tuning in electroweak symmetry breaking. Supersymmetry is
dynamically broken at a scale \Lambda \approx (10 - 100) TeV, which is
transmitted to the supersymmetric standard model sector through standard model
gauge interactions. The dynamical supersymmetry breaking sector possesses an
approximate global SU(5) symmetry, whose SU(3) x SU(2) x U(1) subgroup is
explicitly gauged and identified as the standard model gauge group. This SU(5)
symmetry is dynamically broken at the scale \Lambda, leading to
pseudo-Goldstone boson states, which we call xyons. We perform a detailed
estimate for the xyon mass and find that it is naturally in the multi-TeV
region. We study general properties of xyons, including their lifetime, and
study their collider signatures. A generic signature is highly ionizing tracks
caused by stable charged bound states of xyons, which may be observed at the
LHC. We also consider cosmology in our scenario and find that a consistent
picture can be obtained. Our framework is general and does not depend on the
detailed structure of the Higgs sector, nor on the mechanism of gaugino mass
generation.Comment: 53 pages, 7 figure
Extension of gage calibration study in extreme high vacuum /orbitron and magnetron studies/
Orbitron and magnetron studies for gauge calibration in extreme high vacuu
Plume flowfield analysis of the shuttle primary Reaction Control System (RCS) rocket engine
A solution was generated for the physical properties of the Shuttle RCS 4000 N (900 lb) rocket engine exhaust plume flowfield. The modeled exhaust gas consists of the five most abundant molecular species, H2, N2, H2O, CO, and CO2. The solution is for a bare RCS engine firing into a vacuum; the only additional hardware surface in the flowfield is a cylinder (=engine mount) which coincides with the nozzle lip outer corner at X = 0, extends to the flowfield outer boundary at X = -137 m and is coaxial with the negative symmetry axis. Continuum gas dynamic methods and the Direct Simulation Monte Carlo (DSMC) method were combined in an iterative procedure to produce a selfconsistent solution. Continuum methods were used in the RCS nozzle and in the plume as far as the P = 0.03 breakdown contour; the DSMC method was used downstream of this continuum flow boundary. The DSMC flowfield extends beyond 100 m from the nozzle exit and thus the solution includes the farfield flow properties, but substantial information is developed on lip flow dynamics and thus results are also presented for the flow properties in the vicinity of the nozzle lip
Development of a gas sampling system
Theoretical analysis and computed performance evaluation of high speed entry vehicle gas sampling syste
Laser modulation at the atomic level monthly report no. 8, 1 - 28 feb. 1965
Measurement of temperature dependence of energy levels involved in laser emissio
Laser modulation at the atomic level monthly report no. 7, 1-31 jan. 1965
Laser modulation at atomic level - yttrium- aluminum garnet emission and laser emission shift with homogeneous pulsed magnetic fiel
Error Mitigation of Point-to-Point Communication for Fault-Tolerant Computing
Fault tolerant systems require the ability to detect and recover from physical damage caused by the hardware s environment, faulty connectors, and system degradation over time. This ability applies to military, space, and industrial computing applications. The integrity of Point-to-Point (P2P) communication, between two microcontrollers for example, is an essential part of fault tolerant computing systems. In this paper, different methods of fault detection and recovery are presented and analyzed
Correcting errors in synthetic DNA through consensus shuffling
Although efficient methods exist to assemble synthetic oligonucleotides into genes and genomes, these suffer from the presence of 1–3 random errors/kb of DNA. Here, we introduce a new method termed consensus shuffling and demonstrate its use to significantly reduce random errors in synthetic DNA. In this method, errors are revealed as mismatches by re-hybridization of the population. The DNA is fragmented, and mismatched fragments are removed upon binding to an immobilized mismatch binding protein (MutS). PCR assembly of the remaining fragments yields a new population of full-length sequences enriched for the consensus sequence of the input population. We show that two iterations of consensus shuffling improved a population of synthetic green fluorescent protein (GFPuv) clones from ∼60 to >90% fluorescent, and decreased errors 3.5- to 4.3-fold to final values of ∼1 error per 3500 bp. In addition, two iterations of consensus shuffling corrected a population of GFPuv clones where all members were non-functional, to a population where 82% of clones were fluorescent. Consensus shuffling should facilitate the rapid and accurate synthesis of long DNA sequences
Partons and Jets at the LHC
I review some issues related to short distance QCD and its relation to the
experimental program of the Large Hadron Collider (LHC) now under construction
in Geneva.Comment: Talk at the conference QCD2002 at IIT Kanpur, India, November 2002.
Ten pages with 12 figure
- …