Psychological bases of occupational health of specialists of economic sphere.

A theoretical and methodological approach to the study of the process of professional health of specialists in the economic sphere was developed, which allowed to distinguish professionally important qualities of a specialist influencing his professional health, as well as to predict their transformation in changing social conditions. The peculiarities of the dynamics of the process of occupational health of specialists in the economic sphere (the stage of "primary formation" and undefined attitude to the profession; "personal-activity" stage - realization of social status at the level of the professional community; "professional-ethical" stage – values-based attitude to the profession) are revealed. Types of values-based attitude relation (neutral; pragmatic-realistic; values-based) to professional activity and peculiarities of their manifestations in specialists of economic sphere having different experience of such activity are determined. It is shown that the dynamics of professional becoming of specialists in the economic sphere is associated with the activation of changes in the internal and external environment of the subject of activity. The conceptual model of formation and preservation of professional health of specialists of the economic sphere is offered, implemented as a theoretical and methodological strategy of the systemic and holistic process in the direction of ensuring its effectiveness, presented in the form of an image of a healthy person, responsibly managing his own health and realizing himself in society, and an image of a specialist who independently sets the goals of formation and preservation of professional health, chooses the best ways and means and achievements. The developed model provides a qualitatively new level of personal, physical, professional and social readiness of the person for self-realization in the professional economic sphere of activity and successful integration into society

Tagging High Energy Photons in the H1 Detector at HERA

Measures taken to extend the acceptance of the H1 detector at HERA for photoproduction events are described. These will enable the measurement of electrons scattered in events in the high y range 0.85 < y < 0.95 in the 1998 and 1999 HERA run period. The improvement is achieved by the installation of an electromagnetic calorimeter, the ET8, in the HERA tunnel close to the electron beam line 8 m downstream of the H1 interaction point in the electron direction. The ET8 will allow the study of tagged gamma p interactions at centre-of-mass energies significantly higher than those previously attainable. The calorimeter design and expected performance are discussed, as are results obtained using a prototype placed as close as possible to the position of the ET8 during the 1996 and 1997 HERA running.Comment: 13 pages, 13 figure

A New High Energy Photon Tagger for the H1 - Detector at HERA

The H1 detector at HERA has been upgraded by the addition of a new electromagnetic calorimeter. This is installed in the HERA tunnel close to the electron beam line at a position 8m from the interaction point in the electron beam direction. The new calorimeter extends the acceptance for tagged photoproduction events to the high y range, 0.85 < y < 0.95, and thus significantly improves the capability of H1 to study high energy gamma-p processes. The calorimeter design, performance and first results obtained during the 1996-1999 HERA running are described.Comment: 17 pages, 16 figure

High-speed readout of high-Z pixel detectors with the LAMBDA detector

High-frame-rate X-ray pixel detectors make it possible to perform time-resolved experiments at synchrotron beamlines, and to make better use of these sources by shortening experiment times. LAMBDA is a photon-counting hybrid pixel detector based on the Medipix3 chip, designed to combine a small pixel size of 55 μm, a large tileable module design, high speed, and compatibility with ``high-Z sensors for hard X-ray detection. This technical paper focuses on LAMBDAs high-speed-readout functionality, which allows a frame rate of 2000 frames per second with no deadtime between successive images. This takes advantage of the Medipix3 chips ``continuous read-write function and highly parallelised readout. The readout electronics serialise this data and send it back to a server PC over two 10 Gigabit Ethernet links. The server PC controls the detector and receives, processes and stores the data using software designed for the Tango control system. As a demonstration of high-speed readout of a high-Z sensor, a GaAs LAMBDA detector was used to make a high-speed X-ray video of a computer fan

Application of immunomagnetic separation for accelerated detection of <i>F. tularensis</i> cells in soil samples using an immunochromatographic test

Introduction. Epizootological monitoring of the area contamination with the causative agent of tularemia implies the collection and analysis of a variety of field specimens. The analysis of such objects is time- and labour-consuming. In this context, simple and fast diagnostic techniques are needed to analyze specimens under resource-limited conditions. Aim. To study the possibility of using immunomagnetic separation for accelerated detection of Francisella tularensis cells in soil samples using immunochromatography. Materials and methods. Immunomagnetic particles (IMPs) were produced by using monoclonal antibodies to lipopolysaccharide (LPS) of the tularemia causative agent. Soil specimens weighing 1 g with preliminary introduced inactivated F. tularensis 15/10 cells were used in the study. The samples were suspended in an extraction buffer (EB) and filtered. Tularemia cells were separated by IMP suspension. The particles were washed, resuspended in EB and heated at 100C for 5 minutes. The supernatant was analyzed with test strips based on F. tularensis IC-test kit. Results. A combination of the immunomagnetic separation method and the IC test to detect F. tularensis cells identified up to 1 106 cells of the tularemia pathogen in analyzed soil samples, while 1 107 cells were detected in soil washouts in the absence of immunomagnetic separation. Conclusion. The developed technique combining immunomagnetic separation and IC tests opens up prospects for express diagnostics of soil sample contamination in tularemia foci. The analysis takes about 3 hours, and its sensitivity is 1 106 cells/g of soil. The technique is simple, not requiring sophisticated expensive equipment. It can be easily adapted for testing other specimen types (water, grain, etc.). In addition, separated bacterial cells can be used for F. tularensis detection by other methods

Search for Doubly-Charged Higgs Boson Production at HERA

A search for the single production of doubly-charged Higgs bosons H^{\pm \pm} in ep collisions is presented. The signal is searched for via the Higgs decays into a high mass pair of same charge leptons, one of them being an electron. The analysis uses up to 118 pb^{-1} of ep data collected by the H1 experiment at HERA. No evidence for doubly-charged Higgs production is observed and mass dependent upper limits are derived on the Yukawa couplings h_{el} of the Higgs boson to an electron-lepton pair. Assuming that the doubly-charged Higgs only decays into an electron and a muon via a coupling of electromagnetic strength h_{e \mu} = \sqrt{4 \pi \alpha_{em}} = 0.3, a lower limit of 141 GeV on the H^{\pm\pm} mass is obtained at the 95% confidence level. For a doubly-charged Higgs decaying only into an electron and a tau and a coupling h_{e\tau} = 0.3, masses below 112 GeV are ruled out.Comment: 15 pages, 3 figures, 1 tabl

Forward pi^0 Production and Associated Transverse Energy Flow in Deep-Inelastic Scattering at HERA

Deep-inelastic positron-proton interactions at low values of Bjorken-x down to x \approx 4.10^-5 which give rise to high transverse momentum pi^0 mesons are studied with the H1 experiment at HERA. The inclusive cross section for pi^0 mesons produced at small angles with respect to the proton remnant (the forward region) is presented as a function of the transverse momentum and energy of the pi^0 and of the four-momentum transfer Q^2 and Bjorken-x. Measurements are also presented of the transverse energy flow in events containing a forward pi^0 meson. Hadronic final state calculations based on QCD models implementing different parton evolution schemes are confronted with the data.Comment: 27 pages, 8 figures and 3 table

Deep-Inelastic Inclusive ep Scattering at Low x and a Determination of alpha_s

A precise measurement of the inclusive deep-inelastic e^+p scattering cross section is reported in the kinematic range 1.5<= Q^2 <=150 GeV^2 and 3*10^(-5)<= x <=0.2. The data were recorded with the H1 detector at HERA in 1996 and 1997, and correspond to an integrated luminosity of 20 pb^(-1). The double differential cross section, from which the proton structure function F_2(x,Q^2) and the longitudinal structure function F_L(x,Q^2) are extracted, is measured with typically 1% statistical and 3% systematic uncertainties. The measured partial derivative (dF_2(x,Q^2)/dln Q^2)_x is observed to rise continuously towards small x for fixed Q^2. The cross section data are combined with published H1 measurements at high Q^2 for a next-to-leading order DGLAP QCD analysis.The H1 data determine the gluon momentum distribution in the range 3*10^(-4)<= x <=0.1 to within an experimental accuracy of about 3% for Q^2 =20 GeV^2. A fit of the H1 measurements and the mu p data of the BCDMS collaboration allows the strong coupling constant alpha_s and the gluon distribution to be simultaneously determined. A value of alpha _s(M_Z^2)=0.1150+-0.0017 (exp) +0.0009-0.0005 (model) is obtained in NLO, with an additional theoretical uncertainty of about +-0.005, mainly due to the uncertainty of the renormalisation scale.Comment: 68 pages, 24 figures and 18 table

Measurements of Transverse Energy Flow in Deep-Inelastic Scattering at HERA

Measurements of transverse energy flow are presented for neutral current deep-inelastic scattering events produced in positron-proton collisions at HERA. The kinematic range covers squared momentum transfers Q^2 from 3.2 to 2,200 GeV^2, the Bjorken scaling variable x from 8.10^{-5} to 0.11 and the hadronic mass W from 66 to 233 GeV. The transverse energy flow is measured in the hadronic centre of mass frame and is studied as a function of Q^2, x, W and pseudorapidity. A comparison is made with QCD based models. The behaviour of the mean transverse energy in the central pseudorapidity region and an interval corresponding to the photon fragmentation region are analysed as a function of Q^2 and W.Comment: 26 pages, 8 figures, submitted to Eur. Phys.

Searches at HERA for Squarks in R-Parity Violating Supersymmetry

A search for squarks in R-parity violating supersymmetry is performed in e^+p collisions at HERA at a centre of mass energy of 300 GeV, using H1 data corresponding to an integrated luminosity of 37 pb^(-1). The direct production of single squarks of any generation in positron-quark fusion via a Yukawa coupling lambda' is considered, taking into account R-parity violating and conserving decays of the squarks. No significant deviation from the Standard Model expectation is found. The results are interpreted in terms of constraints within the Minimal Supersymmetric Standard Model (MSSM), the constrained MSSM and the minimal Supergravity model, and their sensitivity to the model parameters is studied in detail. For a Yukawa coupling of electromagnetic strength, squark masses below 260 GeV are excluded at 95% confidence level in a large part of the parameter space. For a 100 times smaller coupling strength masses up to 182 GeV are excluded.Comment: 32 pages, 14 figures, 3 table