No abstract available

No abstract available

[en] Two methods were developed by which daily net short-wave radiation (K∗) can be evaluated from Bellani pyranometer readings. The first method involves a simple regression equation. The second method uses a physical approach taking into account the effect of the Bellani's geometry on its response to direct and diffuse radiation throughout the day. Both methods, when tested on experimental data, tended to underestimate the measured K∗, the regression approach exhibiting a higher variance of the error

No abstract available

[en] First measurements of polarization parameters along the average pulses have been made at a frequency such low. It is found that the monotonous rotation of the polarization position angle may be broken with umps by approximately 90 deg at the front part of the pulsars average pulse. For PSR 0950+08, the position-angle ump, accompanied by a decrease of linear polarization, was observed for the first time in this range. Two types of the polarization profile of PSR 0950+08 have been detected, differing by the shape and the mean degree of linear polarization. The mean over the pulse degree of linear polarization was found to be 67+-6% for PSR 0950+08 and 31+3% for PSR 1133+16

[en] The results of observations of the radio source 3C 123, obtained at frequencies 16.7, 20 and 25 MHz with the aid of the broadband decametric radiointerferometer URAN-1 are presented. The interferometer has baseline 42 km oriented in the eastwest direction. The analysis of the available radio interferometrical observations performed in the frequency range 16.7-1425 MHz permit to estimate the effective angular dimension of the source (assuming the Gaussian brightness distribution) which at 50% total intensity level turned to be frequency independent and equal to 23''

No abstract available

[en] Observations of extragalactic hydroxyl (OH) probe the physical conditions of galactic nuclear regions. The four 18 cm spectral lines of OH are known to respond differently to various conditions, possibly making hydroxyl a better probe then CO and HI in certain galaxies. This survey was used as the basis for a statistical study between OH content and other parameters of the parent galaxy. Statistical methods for samples with upper limits were used to find correlations between tau/sub OH/ and the Hubble Type, IRAS colors, infrared luminosity, and IR-to-blue luminosity ratio of the galaxy. Two galaxies were then studied in detail using the Very Large Array (VLA) interferometer. The first was NGC 3628, an edge-on spiral galaxy in the Leo Triplet. The OH and HI absorption maps reveal a rotating disk which may follow the inner portion of the galaxy's rotation curve. A second structure is expanding with respect to the disk is also revealed and may be similar to the 3-kpc arm in their own Galaxy. The second galaxy studies with the VLA was Mrk 273, a Seyfert with HI absorption and OH Megamaser emission. Although the continuum is resolved at 18 cm (and is a double at six cm), the absorption and emission are associated only with one component and, therefore, not resolved

[en] The patent concerns the imaging of light-opaque specimens using the radiation transmitted through the specimen. The transmitted radiation is a beam of short wavelength radiation, such as x-rays, electrons or neutrons. The transmitted radiation is directed onto a secondary source and stimulates the source to emit visible light. This light is detected by a cooled slow-scan CCD camera, which is coupled to the secondary source by a lens and shutter. The image produced is better than that obtained using existing TEM and X-ray imaging systems. Also the cooled CCD system permits a low radiation beam flux to be used, and allows the specimen to cool or otherwise recover during the exposure. (U.K.)

[en] The utilization of electron accelerators (eBA) is gradually increased in Thailand. For instance, a 30-40 MeV eBA are used for tumor and cancer therapy in the hospitals, and a high current eBA in for gemstone colonization. In the near future, an application of eBA in industries will be grown up in a few directions, e.g., flue gases treatment from the coal fire-power plants, plastic processing, rubber vulcanization and food preservation. It is the major roles of Office of Atomic Energy for Peace (OAEP) to promote the peaceful uses of nuclear energy and to regulate the public safety and protection of the environment. By taking into account of radiation safety aspect, high energy electrons are not only harmful to human bodies, but the radioactive nuclides can be occurred. This report presents a literature review by following the National Committee on Radiation Protection and Measurements (NCRP) report No.31. This reviews for parametric calculation and shielding design of the high energy (up to 100 MeV), high intensity electron accelerator installation