A Pan-Spectral Method of Abundance Determination

We propose a new method for determination of element abundances in stellar atmospheres aimed for the automatic processing of high-quality stellar spectra. The pan-spectral method is based on weighted cumulative line-widths Q of studied element. Difference in quantities Q found from synthetic and observed spectra gives a correction to the initial abundance. Final abundances are then found by rapidly converging iterations. Calculations can be made for many elements simultaneously and do not demand supercomputers.Comment: 4 pages, 2 figures, contribution presented at the ESO/Lisbon/Aveiro Workshop on Precision Spectroscopy in Astrophysics held in Aveiro, Portugal, 11-15 September 200

Kinerja Penyuluh Pertanian dan Dampaknya pada Kompetensi Petani Kakao di Empat Wilayah Sulawesi Selatan

The agricultural extension worker\u27s performance is the work outputs achieved by agricultural extension workers in conducting their jobs. The aim of this research is to know the factors which influence to the agricultural extension worker\u27s performance and the connection between the factors. Also, to know that factors influences the cacao farmers competence. The population of this research is all the agricultural extension workers in four district, South Sulawesi province (447 person). The sample of this research referred to Slovin method from among 106 (one hundred six) agricultural extension workers, 106 (one hundred six) group farmers leaders and 212 (two hundred twelve) cacao farmers . The design of this research was conducted by surveying and interviewing. LISREL program with ‘SEM\u27 was used in analyzing data. The Result of this research show that the agricultural extension worker\u27s performance was influenced significantly by characteristic, competence, motivation and self reliance. The total influence of them were 10 percent and 90 percent were represent other influences outside this study. The suggestion was that their performance must be improved by providing special training to improve their capability in agricultural extension planning, monitoring and evaluation, agricultural extension development and technology disemination

Modelling of mercury isotope separation in CP stellar atmospheres: results and problems

Formation of anomalous isotope abundances in the atmospheres of chemically peculiar (CP) stars can be explained by light-induced drift (LID). This effect is additional to the radiative acceleration and appears due to systematic asymmetry of radiative flux in partly overlapping isotopic spectral line profiles. LID causes levitation of an isotope with a red-shifted spectral line and sinking of an isotope with a blue-shifted line, generating thus diffusive separation of isotopes. We have studied diffusion of mercury as a typical well-studied isotope-rich heavy metal. Our model computations show that in mercury-rich quiescent atmospheres of CP stars LID causes levitation of the heavier mercury isotopes and sinking of the lighter ones. Precise quantitative modelling of the process of isotope separation demands very high-resolution computations and the high-precision input data, including data on hyperfine and isotopic splitting of spectral lines, adequate line profiles and impact cross-sections. Presence of microturbulence and weak stellar winds can essentially reduce the effect of radiative-driven diffusion.Comment: 8 pages, 4 figures. Manuscript accepted for publication in New Astronomy Reviews (proceedings of the 7th Serbian Conference on Spectral Line Shapes in Astrophysics, Zrenjanin, Serbia, June 15-19 2009

This Study Was to Analyze Factors Influencing the Performance of Agricultural Extension Workers and Their Impact on the Competence of Cacao Farmers. a Number of 116 Agricultural Extension Workers, 116 Groups of Farmer Leaders and 232 Cacao Farmers From Four Districts in South Sulawesi Were Participated in This Study. LISREL Program with SEM Was Used in Analyzing Data. the Result Shows That the Agricultural Extension Workers Performance Was Influenced Significantly by Characteristic, Competence, Motivation and Self Reliance. the Total Impact of Them Was 71%. the Suggestion Was That Their Performance Must Be Improved by Providing Special Training to Improve Their Capability in Agricultural Extension Planning, Monitoring and Evaluation, Agricultural Extension Development and Technology Dissemination. Key Words: Agricultural Extension Workers, Competence of Cacao Farmers, Performance

This study was to analyze factors influencing the performance of agricultural extension workers and their impact on the competence of cacao farmers. A number of 116 agricultural extension workers, 116 groups of farmer leaders and 232 cacao farmers from four districts in South Sulawesi were participated in this study. LISREL program with SEM was used in analyzing data. The result shows that the agricultural extension workers performance was influenced significantly by characteristic, competence, motivation and self reliance. The total impact of them was 71%. The suggestion was that their performance must be improved by providing special training to improve their capability in agricultural extension planning, monitoring and evaluation, agricultural extension development and technology dissemination

Isolation, Identification and Bioactivity Test of Non Polar Compounds on N-hexane Extract of Haliclona (Reniera) Fascigera From Samalona Island-spermonde Archipelago

Isolation, identification and bioactivity test of nonpolar compunds has been conducted on n-hexane extract sponge Haliclona (Reniera) fascigera of the island Samalona, Makassar, South Sulawesi. Isolation techniques consist of maceration, partition, fractionation using 2 steps using vacuum column chromatography and flash column chromatography and also purification step. Identification of isolate was analyzed with TLC, FTIR, GC-MS, and 1H NMR. The research result was obtained isolate as much as 4 mg and clear solid form. FTIR analysis indicate functional group OH, CH­2, CH3, C=O, =CH and C-O. Identification of spot TLC under UV light and spotting solvent show that the spot was active on UV long and short waves and dark brown with cerium sulphate. The results show that isolate A contain aliphatic and alcohol compounds. Bioactivity test results indicate that these isolate A be able to inhibit the growth of bacteria Staphylococus aureus with inhibition zone diameter were 11.60 mm (100 ppm); 10.40 mm (50 ppm); 9.50 mm (25 ppm); 6.50 mm (10 ppm); 6,60 mm (negative control); 17.40 mm (positive control) and against bacteria Escherichia coli with inhibition zone diameter were 6.70 mm (100 ppm); 6,10 mm (50 ppm); 5,90 mm (25 ppm); 5.85 mm (10 ppm); 5,20 mm (negative control); 18.60 mm (positive control)

Study of the Effect of Y2 O3 Doping on the Resistance to Radiation Damage of CeO2 Microparticles under Irradiation with Heavy Xe22+ Ions

This paper presents the results of a study on the influence of Y2 O3 doping on the resistance to radiation damage and an assessment of structural changes associated with the accumulation of radiation defects in CeO2 microparticles under irradiation with heavy Xe22+ ions. The relevance of this study consists of the prospects for the use of CeO2 microparticles as materials and candidates of inert matrices of nuclear fuel. A method of solid-phase synthesis was applied to obtain microparticles with different concentrations of dopant. It included grinding of CeO2 and Y2 O3 microparticles followed by thermal sintering at 1100◦ C in an oxygen-containing medium to produce highly ordered microparticles. During the study of the structural characteristics of the synthesized microparticles, it was found that increasing the dopant concentration from 0.05 mol.% to 0.15 mol.% leads to an increase in the crystallinity degree as well as a decrease in dislocation density. According to the results of the assessment of the resistance of microparticles to radiation damage, it was found that an increase in the dopant concentration leads to a decrease in swelling and structural distortion by more than 2.5–3 times, which indicates an increase in the radiation resistance. © 2021 by the authors. Licensee MDPI, Basel, Switzerland.Funding: This research was funded by the Science Committee of the Ministry of Education and Science of the Republic of Kazakhstan (No. AP09058081)

Spectroscopic monitoring of V1357 Cyg = Cyg X-1 in 2002-2004

We discuss the results of optical spectroscopic monitoring of Cyg X-1 = HDE 226868/V1357 Cyg in 2002-2004. Our spectroscopy was carried out at the Terskol Observatory (Kabarda-Balkaria, Russia; the resolving power was R = 45 000 and 13 000) and at the Bohyunsan Optical Astronomy Observatory (BOAO, Korea, R = 30 000 and 44 000). Each spectrum covers most of the optical range. We obtained a total of 75 echelle spectra on 33 nights, during both "soft" and "hard" X-ray states of Cyg X-1. We study the influence of the X-rays on spectral-line profiles using RXTE/ASM X-ray data. We find that the X-ray flare of June 13, 2003 resulted in strong variations of the emission profiles of the Hα and Hellλ4686 Å lines within a night. This behavior is due to variations of the ionization state of the gas in the system. We also analyzed line-profile variations with orbital phase. A spectral atlas of Cyg X-1 was created, and the lines it contains identified. A total of 172 stellar lines and blends belonging to 12 chemical elements (H, He, C, N, O, Ne, Mg, Al, Si, S, Fe, Zn) were identified. The spectral classification of HDE 226868 as an ON star is confirmed. © 2008 Pleiades Publishing, Ltd