Utilization of Image Intensifiers in Astronomy

In this paper we present the properties of image intensifiers, used together with fast TV cameras for astronomical purposes within the MAIA project(Meteor Automatic Imager and Analyser, primarily focused on observing meteoric events with high time resolution). The main objective of our paper is to evaluate the suitability of these devices for astronomical purposes in terms of noise, temporal and spectral analysis

Utilization of Image Intensifiers in Astronomy

In this paper we present the properties of image intensifiers, used together with fast TV cameras for astronomical purposes within the MAIA project(Meteor Automatic Imager and Analyser, primarily focused on observing meteoric events with high time resolution). The main objective of our paper is to evaluate the suitability of these devices for astronomical purposes in terms of noise, temporal and spectral analysis

MAIA: Technical Development of a Novel System for Video Observations of Meteors

A system for double station observation of meteors now known as MAIA (Meteor Automatic Imager and Analyzer) is introduced in this paper. The system is based on two stations with gigabite ethernet cameras, sensitive image intensifiers and automatic processing of the recorded image data. This paper presents the measured electrooptical characteristics of the components and the overall performance of the new digital system in comparison with the current analog solution

PERSEPSI PETANI TERHADAP PERAN PENYULUH PERTANIAN DALAM MENINGKATKAN PRODUKTIVITAS USAHATANI HORTIKULTURA SAYUR SAWI DI DESA TIWATOBI KECAMATAN ILE MANDIRI KABUPATEN FLORES TIMUR

This research had been conducted in Lewokeleng Village, Ile Boleng District, Flores Timur Regency, from February to March 2018. This study aims to know; 1) characteristics of horticultural crops, 2) Perception of farmers on the role of agricultural extension workers as educators, informators, companions, consultants, and mentors in increasing the productivity of vegetable horticultural farming, 3) Perception of farmers to the role of agricultural counselor in increasing the productivity of vegetables farming, and 4) Constraints were faced by farmers in improving productivity of vegetable farming. Data collection method used in this research was survey method. The location of the study was determined intentionally. Respondents were determined as many as 55 farmers, selected by simple random sampling from 122 families of vegetables farmers. The types of the collected data are primary and secondary data. To know the first and second purposes, data was analyzed descriptively and quantitatively, then to know the third purpose, data was analyzed descriptively using likert scale, and to know the fourth purpose, data was analyzed descriptively and quantitatively. The results of research are; 1) The average of productive land which is used by farmers in Lewokeleng Village, Ile Boleng District, East Flores Regency is ​​0.50-1.0 ha. The majority of land which the respondents were working on is self-owned land. The management of vegetable farming, includes land preparation, seeding, planting, maintenance, harvesting and post harvest, and marketing. agriculture in research area is classified as developing agriculture. 2) The role of agricultural counselor in overcoming problems had faced by farmers, most farmers have felt the service of agricultural counselor, the role of the agricultural counselor are 40,36% as educator, 38,55% as informer, 40,48% as companion, 40,00% as consultant, and 40,55% as mentor. The frequency of agricultural counselor activities was low. 3) The perception of farmers on the role of agricultural counselor in increasing the productivity of horticultural crop farming in the village of Lewokeleng included "less good" category with maximum achievement percentage on 37,95% of the range of 36-51%. 4) All respondents faced the same problems which was lack of local government involvement, agricultural counselor involvement, assistance that is inconsistent with the needs of farmers, limited capital, lack of manpower and time, skills and experience of farmers, and markets

Development of an Optimization-Based Atomistic-to-Continuum Coupling Method

Atomistic-to-Continuum (AtC) coupling methods are a novel means of computing the properties of a discrete crystal structure, such as those containing defects, that combine the accuracy of an atomistic (fully discrete) model with the efficiency of a continuum model. In this note we extend the optimization-based AtC, formulated in arXiv:1304.4976 for linear, one-dimensional problems to multi-dimensional settings and arbitrary interatomic potentials. We conjecture optimal error estimates for the multidimensional AtC, outline an implementation procedure, and provide numerical results to corroborate the conjecture for a 1D Lennard-Jones system with next-nearest neighbor interactions.Comment: 12 pages, 3 figure

A novel heteroditopic terpyridine-pincer ligand as building block for mono- and heterometallic Pd(II) and Ru(II) complexes

A palladium-catalyzed Stille coupling reaction was employed as a versatile method for the synthesis of a novel terpyridine-pincer (3, TPBr) bridging ligand, 4'-{4-BrC6H2(CH2NMe2)(2)-3,5}-2,2':6',2 ''-terpyridine. Mononuclear species [PdX(TP)] (X = Br, Cl), [Ru(TPBr)(tpy)](PF6)(2), and [Ru(TPBr)(2)](PF6)(2), synthesized by selective metalation of the NCNBr-pincer moiety or complexation of the terpyridine of the bifunctional ligand TPBr, were used as building blocks for the preparation of heterodi- and trimetallic complexes [Ru(TPPdCl)(tpy)](PF6)(2) (7) and [Ru(TPPdCl)(2)]-(PF6)(2) (8). The molecular structures in the solid state of [PdBr(TP)] (4a) and [Ru(TPBr)(2)](PF6)(2) (6) have been determined by single-crystal X-ray analysis. Electrochemical behavior and photophysical properties of the mono-and heterometallic complexes are described. All the above di- and trimetallic Ru complexes exhibit absorption bands attributable to (MLCT)-M-1 (Ru -> tpy) transitions. For the heteroleptic complexes, the transitions involving the unsubstituted tpy ligand are at a lower energy than the tpy moiety of the TPBr ligand. The absorption bands observed in the electronic spectra for TPBr and [PdCl(TP)] have been assigned with the aid of TD-DFT calculations. All complexes display weak emission both at room temperature and in a butyronitrile glass at 77 K. The considerable red shift of the emission maxima relative to the signal of the reference compound [Ru(tpy)(2)](2+) indicates stabilization of the luminescent (MLCT)-M-3 state. For the mono- and heterometallic complexes, electrochemical and spectroscopic studies (electronic absorption and emission spectra and luminescence lifetimes recorded at room temperature and 77 K in nitrile solvents), together with the information gained from IR spectroelectrochemical studies of the dimetallic complex [Ru(TPPdSCN)(tpy)](PF6)(2), are indicative of charge redistribution through the bridging ligand TPBr. The results are in line with a weak coupling between the {Ru(tpy)(2)} chromophoric unit and the (non)metalated NCN-pincer moiety

Experimental study of the vidicon system for information recording using the wide-gap spark chamber of gamma - telescope gamma-I

The development of the gamma ray telescope is investigated. The wide gap spark chambers, used to identify the gamma quanta and to determine the directions of their arrival, are examined. Two systems of information recording with the spark chambers photographic and vidicon system are compared

Atmospheric trajectories and light curves of shower meteors

Wetensch. publicatieFaculteit der Wiskunde en Natuurwetenschappe

Structural Investigation in Solution of a series of five-Coordinate Bisphosphinoaryl Ruthenium(II) Complexes

The structure of the ruthenium(II) complexes [RuCl{C6H2(CH2PPh2)2-2,6-R-4}(PPh3)] [R = H (1), Ph (2) or Br (3)] was investigated in solution using two-dimensional NMR techniques (1H-1H-, 13C-1H- and 31P-1H-correlation NMR spectroscopy and 1H NOESY). The 1H and 13C NMR spectra of the complexes 1-3 were similar and could be completely assigned. The results of the NOESY study indicated that these complexes have a distorted square-pyramidal geometry in solution as was established for the parent complex R = H in the solid state by an X-ray crystal structure determination. The strategies used for the interpretation of the 1H, 13C and 31P NMR spectra of these compounds and the resulting assignments form the basis for future in situ studies involving these complexes in catalytic processes. Supporting information for this article is available on the WWW under http://www.wiley-vch.de/contents/jc_2005/2000/99478_s.pdf or from the author

Meteor showers of comet C/1917 F1 Mellish

December Monocerotids and November Orionids are weak but established annual meteor showers active throughout November and December. Analysis of a high quality orbits subset of the SonotaCo video meteor database shows that the distribution of orbital elements, geocentric velocity and also the orbital evolution of the meteors and potential parent body may imply a common origin for these meteors coming from the parent comet C/1917 F1 Mellish. This is also confirmed by the physical properties and activity of these shower meteors. An assumed release of meteoroids at the perihelion of the comet in the past and the sky-plane radiant distribution reveal that the December Monocerotid stream might be younger than the November Orionids. A meteoroid transversal component of ejection velocity at the perihelion must be larger than 100 m/s. A few authors have also associated December Canis Minorids with the comet C/1917 F1 Mellish. However, we did not find any connection.Comment: 11 pages, 11 figures and 5 table