Simple molecules as benchmark systems for molecular electronics

In society there is a constant urge to improve existing devices and the level of success is perhaps the easiest to observe in the world of electronic devices. The complexity, functionality and reliability of these machines has increased enormously, but it approaches its limits. A new giant step which will provide the space for further development is the concept of molecular electronics where organic molecules and their natural characteristics are used as the functional units. The research presented in this thesis is a small part of the large effort which the scientific community puts nowadays into this goal. The system under the investigation is molecular bridge where the molecule is hydrogen or CO or acetylene or benzene. We characterise junctions by point contact spectroscopy and can address different modes of oscillation by following stretching dependence of vibration energy.UBL - phd migration 201

Quantification of biofilm formation on silicone intranasal splints: An in vitro study

Objectives: Biofilms are associated with persistent infections and resistant to conventional therapeutic strategies. The aim of this study was to investigate the quantity of biofilm produced on silicone intranasal splints. Methods: Quantity of biofilm formation on silicone splints (SS) was tested on 15 strains of Staphylococcus aureus and Moraxella catarrhalis, respectively. Antimicrobial susceptibility testing was performed in accordance with European Committee on Antimicrobial Susceptibility Testing recommendations. Results: All tested strains formed different amounts of biofilm on SS: 66.7% S. aureus and 93.3% M. catarrhalis were weak biofilm producers and 33.3% S. aureus and 6.7% M. catarrhalis were moderate biofilm producers. S. aureus formed significantly higher quantity of biofilm compared with M. catarrhalis (p  Conclusion: Quantity of biofilm on SS is highly dependent on bacterial species and their resistance patterns. Future studies are needed to ascertain another therapeutic option for prophylaxis prior to SS placement

Manufacturing Cycle Time Analysis and Scheduling to Optimize Its Duration

This paper reports the results of investigations on manufacturing cycle times for special-purpose products. The company performs serial production characterized by complex and diverse technologies, alternative solutions and combined modes of workpiece movement in the manufacturing process. Because of various approaches to this problem, an analysis of previous investigations has been carried out, and a theoretical base is provided for the technological cycle and factors affecting the manufacturing cycle time. The technological and production documentation of the company has been analysed to establish the technological and real manufacturing cycle times, total losses and flow coefficients. This paper describes the original approach to production cycle scheduling on the grounds of investigations of manufacturing capacity utilization levels and causes of loss, in order to measure their effects and to reduce the flow coefficient to an optimum level. The results are a segment of complex studies on the production cycle management of complex products, accomplished in the company in the period from 2010 to 2012

Manufacturing Cycle Time Analysis and Scheduling to Optimize Its Duration

This paper reports the results of investigations on manufacturing cycle times for special-purpose products. The company performs serial production characterized by complex and diverse technologies, alternative solutions and combined modes of workpiece movement in the manufacturing process. Because of various approaches to this problem, an analysis of previous investigations has been carried out, and a theoretical base is provided for the technological cycle and factors affecting the manufacturing cycle time. The technological and production documentation of the company has been analysed to establish the technological and real manufacturing cycle times, total losses and flow coefficients. This paper describes the original approach to production cycle scheduling on the grounds of investigations of manufacturing capacity utilization levels and causes of loss, in order to measure their effects and to reduce the flow coefficient to an optimum level. The results are a segment of complex studies on the production cycle management of complex products, accomplished in the company in the period from 2010 to 2012

Effect of different fertilizers on the microbial activity and productivity of soil under potato cultivation

This study was conducted to evaluate the effect of the application of different rates of mineral nitrogen, well rotten farmyard manure and Klebsiella planticola SL09- based microbial biofertilizer (enteroplantin) on the count of soil microorganisms (total microbial count, counts of Azotobacter, oligonitrophilic bacteria, fungi and actinomycetes), stem height and yield of potato. The experiment was set up as a randomized block design in four replications at the experimental field of the Biotechnical Faculty, Podgorica in 2008. Potato cultivar Kennebec was used as the test plant. The trial involved six treatments: non-fertilized control; N1 treatment with 100 kg/ha CAN (calcium ammonium nitrate, 27% N); N2 treatment with 200 kg/ha CAN; N3 treatment with 300 kg/ha CAN; treatment with Enteroplantin– K. planticola SL09-based biofertilizer; and treatment with 30 t/ha solid well rotten farmyard manure. The results obtained suggested that well rotten farmyard manure induced the highest increase in microbial counts, potato yield and stem height. A similar effect on all microorganisms, except actinomycetes and fungi was seen with the use of K. planticola SL09-based biofertilizer. The potato yield and stem height obtained with the use of 300 kg/ha CAN was non-significantly higher than that of 200 kg/ha CAN treatment, with the count of the soil microorganisms tested been significantly reduced.Key words: Biofertilization, microorganisms, soil, manure, mineral nitrogen, potato, yield

Istraživanje osnovnih parametara mehanizacije u cilju unapređenja proizvodnje, uštede energije i očuvanja životne sredine u poljoprivredi

Project 12M12 is realized in the scope of ten subproject in accordance with program, which is defined by agreement of ministry for period 1996-2000. There were about 120 scouter included in started year and about 80 scouter in final year. 911 papers were published in domestic or foreign journals or on scientific meetings. 25 monographs were published and 5 dissertation and 5 M. Sc. thesis were defended in the scope of project based on research. The situation of agricultural technique has been researched, necessities have been estimated and directions of development of power machines, tractors, processing technique, agricultural machines, vegetable production, animal husbandry, fruit growing, viticulture, mechanization for production salutary, spices and aromatic plants have been defined. The available methods have been advanced and the new methods have been developed for selection and forming tractor's systems and optimization structure and composition of engineering park in the agriculture. The soil compaction has been researched and changes have been established under effect of tractor's wheels, machines and transport vehicles and criterions have been set for reduction and supervision of soil compaction. The damages, appeared because of overmuch compaction, were estimated on 250- 300 USA $/ha per year. The new methods and equipment for prescience pull of tractor have been recommended. The powerful factors of fuel consumption have been affirmed and technology for production and reliance of alternative fuels (bio-diesel and generator gas) have been defined. The reliability of tractors and machines has been researched. The new and available technology and technical solutions of working of the soil, seeding and planting, mechanical and chemical care, collecting, finishing and storage agricultural products have been developed and reformed. The probability of application of sceaning method, method finalled elements, regression analysis, multicriterion optimization, fuzzy logic and neuron's networks, numeric analysis and others methods in process of outlay, projecting and concurring the new settlements of agricultural machines have been researched.Projekat Ministarstva nauke Republike Srbije, br. 12M12 realizovan je u okviru deset potprojekata prema programu koji je definisan ugovorom sa ministarstvom za period 1996-2000. godine. U izradi projekta učestvovalo je oko 120 istraživača u početnoj godini i oko 80 u završnoj godini. Objavljeno je 911 radova u domaćim ili inostranim časopisima ili na naučnim skupovima. Na osnovu istraživanja u okviru projekta objavljeno je 25 monografija i odbranjeno pet doktorskih i pet magistarskih teza. Istraženo je stanje poljoprivredne tehnike, procenjene potrebe i definisani pravci razvoja pogonskih mašina, traktora, procesne tehnike, mehanizacije u ratarstvu, povrtarstvu, stočarstvu, voćarstvu, vinogradarstvu, mehanizacije za proizvodnju lekovitog, začinskog i aromatičnog bilja. Unapređene su postojeće i razvijene nove metode za izbor i formiranje traktorskih sistema i optimizaciju strukture i sastav mašinskog parka u poljoprivredi. Istraživano je sabijanje zemljišta i utvrđene su promene nastale pod dejstvom točkova traktora, mašina i transportnih vozila i predložene su mere za smanjenje i kontrolu sabijanja. Procenjene su štete nastale usled prekomernog sabijanja zemljišta od 250 do 300 USA$/ha godišnje. Predložene su nove metode i oprema za predviđanje vuče traktora na van putnim podlogama. Utvrđeni su uticajni faktori na potrošnju goriva i maziva i definisana je tehnologija za proizvodnju i korišćenje alternativnih goriva (biodizel i prirodni gas). Istraživana je pouzdanost traktora i mašina. Razvijene su nove ili poboljšane postojeće tehnologije i nova ili poboljšana tehnička rešenja u obradi zemljišta, setvi i sadnji, mehaničkoj i hemijskoj nezi, ubiranju, doradi i čuvanju poljoprivrednih proizvoda. Istražena je mogućnost primene metoda skeniranja, metoda konačnih elemenata, regresione analize, višekriterijumske optimizacije, fuzzy logike i neuronskih mreža, numeričke analize i drugih metoda u procesu proračuna, projektovanja i osvajanja novih rešenja poljoprivrednih mašina

Još o toksičnosti kadmija - s posebnim osvrtom na nastanak oksidacijskoga stresa i na interakcije s cinkom i magnezijem

Discovered in late 1817, cadmium is currently one of the most important occupational and environmental pollutants. It is associated with renal, neurological, skeletal and other toxic effects, including reproductive toxicity, genotoxicity, and carcinogenicity. There is still much to find out about its mechanisms of action, biomarkers of critical effects, and ways to reduce health risks. At present, there is no clinically efficient agent to treat cadmium poisoning due to predominantly intracellular location of cadmium ions. This article gives a brief review of cadmium-induced oxidative stress and its interactions with essential elements zinc and magnesium as relevant mechanisms of cadmium toxicity. It draws on available literature data and our own results, which indicate that dietary supplementation of either essential element has beneficial effect under condition of cadmium exposure. We have also tackled the reasons why magnesium addition prevails over zinc and discussed the protective role of magnesium during cadmium exposure. These findings could help to solve the problem of prophylaxis and therapy of increased cadmium body burden.Iako je otkriven tek 1817. godine, kadmij je trenutačno jedan od najvažnijih onečišćivača životne i radne sredine. Štetno djeluje na bubrege, živčani sustav, kosti, reproduktivni sistem, a ima i genotoksične i karcinogene efekte. Nužna su dalja istraživanja vezana za mehanizme njegove toksičnosti, biomarkere efekata, kao i načine smanjenja rizika za zdravlje. Osim toga, do danas nije otkriven agens efikasan u terapiji trovanja kadmijem s obzirom na to da je kadmij intracelularni kation. U ovom radu dan je sažet pregled važnih mehanizama toksičnosti kadmija, kao što su nastanak oksidativnog stresa i interakcije s esencijalnim elementima, cinkom i magnezijem, na osnovi dostupnih literaturnih podataka, kao i naših ispitivanja koja upućuju na to da povećani unos navedenih esencijalnih elemenata pokazuje pozitivne efekte pri ekspoziciji kadmiju. Obrazložena je prednost suplementacije magnezijem pred suplementacijom cinkom i razmatrana preventivna uloga magnezija pri intoksikaciji kadmijem. Ovi su rezultati doprinos rješavanju problema profi lakse i terapije trovanja kadmijem

Error estimates of Gaussian-type quadrature formulae for analytic functions on ellipses-a survey of recent results. ETNA - Electronic Transactions on Numerical Analysis

This paper presents a survey of recent results on error estimates of Gaussian-type quadrature formulas for analytic functions on confocal ellipses