Experimental research of the angular superresolution of correlated signal sourcesby the minimum polynomial method.

Experimental results on the super-resolution of two closely spaced signal sources obtained using a car radar of the millimeter wavelength range are presented. The peculiarities of the experimental conditions were a high mutual correlation of signal sources and an extremely short input process, which consisted of only one sample. The estimation of the number of sources was carried out using the method of the minimum polynomial of the correlation matrix of signals in the antenna array, which provided the probability of correct estimation of the number of sources equal to 100% in all scenarios of the signal situation. To find the angular coordinates of the sources, we used the method of scanning the AA beam, the spectral and root methods of the minimum polynomial. Comparative analysis showed that the root method is more efficient and provides resolution of sources in cases of smaller angular distance between them.

Analisis Sifat Mekanik Hasil Pengelasan SMAW dengan Akar Las Tig dan Las SMAW pada Pipa API 5L

The purpose of this research is to know the mechanical properties of the welds due to the current variation of welding joint API 5L using TIG and SMAW welding root methods. Preparation of specimens of pipe API 5L PSL1 grade X56 (Ø 177.8 mm, length 200 mm, width 7 mm), then specimens preparation were made in a single V 600, root gap 2mm, root face 2mm. Filling the welding roots with TIG welding and SMAW using electrodes E7018 with a current variation 70A, 80A, 90A. Mechanical tests consist of tensile, bending and hard test. The results showed that the quality of a good TIG root weld at 70A, the highest tensile strength of the weld joint 52.27 kgf/mm2 (70A), the highest hardnest 164,217 HRB (90A), the bending strength 1.123,061 N/mm2 (70A) using face bend method and 1,172,959 N/mm2 with root bend. In SMAW root welding, the highest tensile strength 54.27 kgf/mm2 (70 A) , the highest hardnest 158.717 HRB (70 A), the highest bending strength 1.115,611 N/mm2 (70 A) using face bend method, and 1.161,748 N/ mm2 with root bend.

Studies on Chemical Constituents of the Baphicacanthus cusia (Nees) Bremek Root

Objective: Studies on the chemical constituents of the Baphicacanthus plants, Baphicacanthus cusia (Nees) Bremek root. Methods: Using Column chromatography to separation and purification. Identify the compounds structures through the Physicochemical properties and spectral analysis methods. Result: Isolated 9 compounds from the Baphicacanthus cusia (Nees) Bremek roots. They were identified as Stigmasterol-3-O-β-D–glucoside(I), Spinasterol-3-O-β-D– glucoside(Ⅱ),2-(3,4-dihydroxyphenylacetic phenylethyl)]-3O-α-L-rhamnosyl-(1 → 4)-(4-O-caffeoyl)-β-D-pyran-glucosidase(III), Lupeol(Ⅳ), Indigo(Ⅴ), Indirubin (VI), Sucrose (Ⅶ), Adenosine (VIII), β-sitosterol(IX). Among them, compound I and compound II are compounds that at the first time isolated from this plant.

The Extraction of Main Chemical Compositions in Rumex Root

Purpose: The purpose of this study was to study the compositions of the polygonaceae medicinal plants called rumex root. Methods: Solvent method and chromatography was used to purificate the chemical compositions of Rumex, and the molecular structure of the compound was identified by physical and chemical properties and spectral data. Results: Two compounds were obtained from the ethanol extract of rumex root, which were identified as Chrysophanol and Physcione. Conclusions: Experimental basis was provided for the further study of the active ingredients of rumex root and the development and utilization of medical resources.