The main goal of the work is to validate ion-exchange substrates as optimizers of plant mineral supply within bio-engineering systems of life support with a high level of closure. Test objects were ...spring Lisovsky wheat-232 and leaf cabbage Sensuji-kyomizuna. Crops were cultivated on artificial soil (AS) in environmentally controlled plant growth chambers. Prior to seeding, AS was enriched simultaneously with wheat straw and ion-exchange substrate BIONA-312 to the extent of 2, 10 or 20% of AS dry mass. Incorporation of the ion-exchange substrate in the amount of 10% increased crop productivity and eliminated the negative effect of wheat straw. Ion-exchange substrate in amount of 20% did not yield a noticeable gain in productivity as compared with the previous test.
We report the results of a study of B super(+/-) arrow right K super(+/) eta c and B super(+/-) arrow right K super(+/-) eta c(2S) decays followed by eta and eta (2S) decays to super(0)(KSK pi ). The ...results are obtained from a data sample containing 535 million inline image-meson pairs collected by the Belle experiment at the KEKB e super(+)e super(-) collider. We measure the products of the branching fractions inline image and inline image. Interference with the non-resonant component leads to significant model uncertainty in the measurement of these product branching fractions. Our analysis accounts for this interference and allows the model uncertainty to be reduced. We also obtain the following charmonia masses and widths: inline image, inline image, inline image, inline image.
ATLAS Transition Radiation Tracker test-beam results Akesson, T.; Arik, E.; Baker, K. ...
2nd Workshop on Advanced Transition Radiation Detectors for Accelerator and Space Applications,Bari, Italy,2003-09-04 - 2003-09-07,
2004, Volume:
522, Issue:
1
Journal Article, Conference Proceeding
Peer reviewed
Several prototypes of the Transition Radiation Tracker for the ATLAS experiment at the LHC have been built and tested at the CERN SPS accelerator. Results from detailed studies of the straw-tube hit ...registration efficiency and drift-time measurements and of the pion and electron spectra without and with radiators are presented.
We report the first observations of the spin-singlet bottomonium states h(b)(1P) and h(b)(2P). The states are produced in the reaction e(+)e(-)→h(b)(nP)π(+)π(-) using a 121.4 fb(-1) data sample ...collected at energies near the Υ(5S) resonance with the Belle detector at the KEKB asymmetric-energy e(+)e(-) collider. We determine Mh(b)(1P)=(9898.2(-1.0-1.1)(+1.1+1.0)) MeV/c(2) and Mh(b)(2P)=(10,259.8±0.6(-1.0)(+1.4)) MeV/c(2), which correspond to P-wave hyperfine splittings ΔM(HF)=(+1.7±1.5) and (+0.5(-1.2)(+1.6)) MeV/c(2), respectively. The significances of the h(b)(1P) and h(b)(2P) are 5.5σ and 11.2σ, respectively. We find that the production of the h(b)(1P) and h(b)(2P) is not suppressed relative to the production of the Υ(1S), Υ(2S), and Υ(3S).
The Transition Radiation Tracker (TRT) sits at the outermost part of the ATLAS Inner Detector, encasing the Pixel Detector and the Semi-Conductor Tracker (SCT). The TRT combines charged particle ...track reconstruction with electron identification capability. This is achieved by layers of xenon-filled straw tubes with periodic radiator foils or fibers providing TR photon emission. The design and choice of materials have been optimized to cope with the harsh operating conditions at the LHC, which are expected to lead to an accumulated radiation dose of 10 Mrad and a neutron fluence of up to 2middot10 14 n/cm 2 after ten years of operation. The TRT comprises a barrel containing 52 000 axial straws and two end-cap parts with 320 000 radial straws. The total of 420 000 electronic channels (two channels per barrel straw) allows continuous tracking with many projective measurements (more than 30 straw hits per track). The assembly of the barrel modules in the US has recently been completed, while the end-cap wheel construction in Russia has reached the 50% mark. After testing at the production sites and shipment to CERN, all modules and wheels undergo a series of quality and conformity measurements. These acceptance tests survey dimensions, wire tension, gas-tightness, high-voltage stability and gas-gain uniformity along each individual straw. This paper gives details on the acceptance criteria and measurement methods. An overview of the most important results obtained to-date is also given
Acute experiments on 22 anesthetized and immobilized cats used a time slice method to study changes in the maps of 83 on and/or off receptive fields in 47 neurons in field 17 of the visual cortex. ...The latent period of the appearance of the receptive field averaged 88 ± 5 msec and its persistence time was 192 ± 12 msec. During generation of responses, the area and weighting on the one hand and the location of its discharge center on the other, changed in a wavelike fashion up to three times in all the neurons studied, the duration of each wave averaging 95 ± 4 msec. The discharge center of the receptive field moved in a wavelike manner in 99% of cases, moving towards and away from the center of the overall map with a period of 67.3 ± 3 msec. In 72.5% of neurons, movement of the discharge center occurred via different trajectories, which were ellipses. The functional significance of changes in the receptive fields of striate neurons in relation to the dynamics of their detector properties are discussed, as are the possible mechanisms of these rearrangements.
The transition radiation tracker (TRT) is one of the three subsystems of the inner detector of the ATLAS experiment. It is designed to operate for 10 yr at the LHC, with integrated charges of /spl ...sim/10 C/cm of wire and radiation doses of about 10 Mrad and 2/spl times/10/sup 14/ neutrons/cm/sup 2/. These doses translate into unprecedented ionization currents and integrated charges for a large-scale gaseous detector. This paper describes studies leading to the adoption of a new ionization gas regime for the ATLAS TRT. In this new regime, the primary gas mixture is 70%Xe-27%CO/sub 2/-3%O/sub 2/. It is planned to occasionally flush and operate the TRT detector with an Ar-based ternary mixture, containing a small percentage of CF/sub 4/, to remove, if needed, silicon pollution from the anode wires. This procedure has been validated in realistic conditions and would require a few days of dedicated operation. This paper covers both performance and aging studies with the new TRT gas mixture.
KTM Experimental Complex Project Status Tazhibayeva, I. L.; Azizov, E. A.; Krylov, V. A. ...
Fusion science and technology,
04/2005, Volume:
47, Issue:
3
Journal Article
Peer reviewed
A review of KTM experimental complex project status, which is aimed the creation of a Kazakhstani spherical tokamak for study and tests materials and components of future fusion reactors. Revised ...basic parameters of the KTM facility and ground of the changes taking into account new plasma core geometry, new design of vacuum chamber and modified magnetic system, transport sluice and movable divertor devices, and additional RF-heating system are presented here.
PDF
