[en] When high-brilliance radiation is needed for experiments, insertion device sources are generally viewed on-axis. Off-axis emission of flux can be prodigious especially from wiggler sources having large emission fans. The on-axis and off-axis radiation emission characteristics from insertion device sources have been calculated extensively and are well known, but experimental verifications of some characteristics, particularly those associated with off-axis emission, are relatively few. Here measurements of the flux spectrum and apparent source size are described, as a function of horizontal emission angle, from the former X25 hybrid wiggler at the National Synchrotron Light Source (NSLS).

[en] Three different approaches of the basic concepts involved in designing and operating hydraulic machines and alike are presented. The essential general data, characteristic graphs, and similitude are described. An analysis using logical charts is presented in seven tables: turbomachines, flow and pressure regulation, construction, mechanical performance, stress resistance, use and economic aspects. These charts are illustrated with selected examples such as the ejectors of a BWR, and Bugey blowers

[en] The Gas-Cooled Fast Breeder Reactor (GCFR) Demonstration Plant uses three helium loops to transfer heat from the reactor core to the steam generators. Helium flow in each loop is provided by a circulator driven by a 24,000 horsepower electric motor. Experimental verification of the designs of the circulator, circulator service system, main and pony motors, main and pony motor controllers, loop isolation valve instrumentation and control systems is needed to demonstrate that operational and safety requirements are met. A GCFR helium circulator test facility sized for full design conditions is proposed. The circulator will be mounted in a large vessel containing high pressure helium which will permit testing at the same power, speed, pressure, temperature and flow conditions present in the (demonstration) plant. The electric drive motor for the circulator will obtain its power from an electrical supply and distribution system in which electrical power will be taken from a local utility grid via a transformer

[en] The optimization of fan performance under changed conditions has important significance for the practical application of the fan. In view of the low efficiency of the original fan, the stable working flow span of the flow pressure curve is narrow, and it is difficult to meet the performance requirement after the working point change. Without changing the radial and axial dimensions of the fan, the performance of the original fan is optimized so that it increases from the total pressure 16153pa to 17271pa when operating flow 1900m3/h, meets the optimized target of total pressure 17000pa, the performance increases by 6.9%, and makes the stable working range of its pressure curve widen. (paper)

[en] The article Cellular distribution of cadmium in two amaranth (Amaranthus mangostanus L.) cultivars differing in cadmium accumulation, written by Keyu Chi, Rong Zou, Li Wang, Wenmin Huo and Hongli Fan, was originally published electronically on the publisher’s internet portal (currently SpringerLink)

[en] Automotive radiator played an essential role as a heat exchanger that exchange the circulated heated coolant inside the engine compartment to return into its ambient temperature. Radiator cooling fan that attached at the back of radiator, is a device that work to regulate the coolant temperature when the heated coolant is passed inside the radiator tubes. It produces external flow of air that passes through the fins and tubes of the radiator. However, this external flow contributes high noise level into the system. In consequence of this risk, a detailed experimental study on noise analysis to identify the location of maximum sound pressure level (SPL) generated by variations of cooling fan speed by using sound intensity mapping method is presented. Ethylene Glycol (EG)-water based was used as working fluid operate with engine temperature range from 80 to 90 °C. The cooling fan speed of radiator cooling fan were varied from 750 to 1250 rpm and the water flowrates were 8.0, 11.0, and 14.0 l/min. The results indicate that the noise level is increasing with the fan speed. However, there is no significance difference of change in coolant flow rate and type of coolant fluids to the noise level. The location of maximum sound pressure level is identified and the higher SPL value most located on the blade trailing edge of the suction surface with highest SPL value of 81 db for 1250 rpm fan speed. The project delivers the reliable input for the engineering practice to reduce automotive radiator noise level. (paper)

[en] The report contains the results of the Helium Circulator Auxiliary System Study performed as a part of the High Temperature Reactor Development Program. The major objectives of the study were to review and analyze the existing Fort St. Vrain (FSV) system (System 21) in an effort to identify and recommend modifications which would reduce system interactions, increase system stability, and improve the capability to mitigate system transients. The Helium Circulator Auxiliary System at FSV is comprised of several sub-systems which perform various functions to support the operation of the helium circulators. The primary functions of the system are to provide a source of clean, filtered water for lubrication of the circulator bearings and provide a dry, pressurized buffering gas to the circulator seals. The recommendations contained in this report are aimed at improving performance of the bearing water portion of the system

[en] The article is devoted to the optimization of the ventilation system of a residential house with a warm attic. A new technical solution was proposed for the installation of an industrial fan in the space of a warm attic. The operation of such a system is provided by the phenomenon of ejection. The article presents the proposed method for calculating the ejection stream of an industrial fan. The advantages of this ventilation system were listed on the basis of the analysis. There is a table comparing the centrifugal exhaust fan with individual exhaust fans in the conclusion of the article. (paper)

[en] Recently, we proposed and optimized dedicated multi-pinhole molecular breast tomosynthesis (MBT) that images a lightly compressed breast. As MBT may also be performed with other types of collimators, the aim of this paper is to optimize MBT with fan beam and slit-slat collimators and to compare its performance to that of multi-pinhole MBT to arrive at a truly optimized design. Using analytical expressions, we first optimized fan beam and slit-slat collimator parameters to reach maximum sensitivity at a series of given system resolutions. Additionally, we performed full system simulations of a breast phantom containing several tumours for the optimized designs. We found that at equal system resolution the maximum achievable sensitivity increases from pinhole to slit-slat to fan beam collimation with fan beam and slit-slat MBT having on average a 48% and 20% higher sensitivity than multi-pinhole MBT. Furthermore, by inspecting simulated images and applying a tumour-to-background contrast-to-noise (TB-CNR) analysis, we found that slit-slat collimators underperform with respect to the other collimator types. The fan beam collimators obtained a similar TB-CNR as the pinhole collimators, but the optimum was reached at different system resolutions. For fan beam collimators, a 6–8 mm system resolution was optimal in terms of TB-CNR, while with pinhole collimation highest TB-CNR was reached in the 7–10 mm range. (paper)

No abstract available