THE HYDROLOGICAL AND ENVIRONMENTAL ASPECT OF LOW FLOW ASSESSMENT IN UNGAUGED BASINS – A CASE STUDY IN THE JUŽNA MORAVA RIVER BASIN

Eighteen low flow indicators are considered in the research of sixteen hydrological stations in the Južna Morava river basin. The indicators are estimated by statistical analysis and grouped as hydrological and environmental indicators. A cross-correlation between all indicators is assessed. Environmental flows at hydrologic stations are obtained by the GEP method. The environmental low flow indicators are transferred to two small ungauged basins by regression with physiographic characteristics. The adjustment of environmental flows at ungauged basins is performed according to the locations of the donor stations in the hydrogeological regions of the studied area

COMB JAMMING AS A STRATEGY FOR RCIED ACTIVATION PREVENTION

The main objective of this paper is the analysis of comb jamming as a technique for RCIED activation prevention. Presentation of three strategies for comb signal generation follows after comprehensive survey of various jamming techniques in the introduction. There are two paper original contributions. The first one is quantitative comparison for three signal generation techniques of their emission power in relation to barrage jamming under the condition of equal BER value. The second contribution is determination of exact BER value as a function of emission power in the case of barrage jamming. Until now we have made different analyses and comparisons starting from estimated emission power. The analysis procedure is performed for QPSK modulated RCIED activation signal. Power saving is evident for all three methods of jamming signal generation. It is proved that additional 2.5dB of power saving is achieved by equalization of frequency components level in comb signal. The analysis in this paper shows that comb jamming allows the same effects as barrage jamming, but with lower emission power

VERIFICATION OF CALCULATION METHOD FOR DRONE MICRO-DOPPLER SIGNATURE ESTIMATION

Drones micro-Doppler signatures obtained by FMCW radars are an excellent procedure for malicious drone detection, identification and classification. There are a number of contributions dealing with recorded spectrograms with these micro-Doppler signatures, but very low number of them has analyzed possibility to calculate echo caused by drone moving parts. In this paper, starting from already existing mathematical apparatus, we presented such spectrograms as a function of changing drone moving parts characteristics: rotor number, blades number, blade length and rotor moving speed. This development is the part of a wider project intended to prevent malicious drone usage

Combination free replacement and pro-rata warranty policy optimization model

Rizik koji prati razvoj proizvoda raste iz dana u dan. Jedan od faktora koji utiču na ovaj rizik je garancija proizvoda. Garancija je moćno marketinško oružje za proizvođača i istovremeno dobra zaštita za proizvođača i kupca, ali uvek podrazumeva dodatne troškove za proizvođača. Ovi troškovi zavise od karakteristika pouzdanosti proizvoda i parametara garancije. Ovaj rad se bavi optimizacijom ovih parametara za poznatu raspodelu otkaza proizvoda u cilju smanjivanja troškova garancije i istovremenog zadržavanja njene promotivne funkcije. Kombinacija garancije besplatne zamene i parcijalne garancije je izabrana kao model, pri čemu su varirane dužine perioda besplatne zamene i perioda parcijalne garancije, kao i koeficijenti koji definišu funkciju parcijalnih troškova. Vrednosti troškova garancije dobijene su pomoću analitičkih jednačina i simulacije. Dobijeni rezultati su prikazani i razmotreni i izneta su zaključna opažanja.Product development risk increases more and more every day. One of the factors that affect this risk is product warranty. Warranty is a powerful marketing instrument for the manufacturer and a good protection for both the manufacturer and the customer, but it always involves additional costs to the manufacturer. These costs depend on the product reliability and the warranty parameters. This paper deals with the optimization of these parameters for known product failure distribution to reduce the warranty costs to the manufacturer while retaining the promotional function of the warranty. Combination free replacement and pro-rata warranty policy is chosen as a model and the length of free replacement and pro-rata policy periods are varied, as well as the coefficients that define the pro-rata cost function. Warranty costs are obtained by using analytical equations and by simulation. The obtained results are shown and discussed and some concluding remarks are given

Strength verification of semi-trailer's self-supporting ADR tank body

Problematika rada odnosi se na distribuciju opterećenja kroz zonu oslanjanja rezervoara. U radu se potencira značaj uticaja koji konstrukcija oslonih jastuka rezervoara, odnosno interakcija sa donjim postrojem cisterne ima na njegovo ponašanje i pouzdanost. U radu je razmatrano aktuelno stanje, uz komentar zahteva i kriterijuma koji normativno regulišu ovaj segment. Osnovni cilj rada je da ukaže na nedoslednost i nepreciznost aktuelne regulative i ponudi način za prevazilaženje uočenih problema primeren stanju tehnike u segmentu identifikacije ponašanja i verifikacije konstrukcija sa stanovišta čvrstoće. U ovom smislu predstavljena je konkretna primena razvijenog metodološkog prilaza na primeru specifičnog rešenja oslanjanja samonosećeg ADR rezervoara poluprikolice cisterne u zoni vučnog čepa, uz ilustrativno predstavljanje proračunskih odziva karakterističnih varijanti i režima opterećenja, uključujući sva potrebna pojašnjenja i komentare dobijenih rezultata.This paper analyzes load distribution throughout the tank body suspension zone. It points out the importance of influence that the design of the link between the tank wall and the base of the tank vehicle (suspension cushion zone) has on the structure behaviour and reliability. In this study, the current state is considered, giving comments on the requirements and the criteria which make a normative regulation of this segment. The basic purpose of this study is to point out the inconsistency and inaccuracy of current regulations as well as to offer a technically adequate way of resolving the stated problems in the segment of identification of behaviour and verification of construction from the strength point of view. In addition, we have illustrated how a developed methodological approach has been applied to a particular model of self-supporting ADR tank body of semi-trailers in the fifth wheel coupling pin zone, including the characteristic graphic presentation of carried out calculations and necessary explanation and comments

Strength verification of semi-trailer's self-supporting ADR tank body

Problematika rada odnosi se na distribuciju opterećenja kroz zonu oslanjanja rezervoara. U radu se potencira značaj uticaja koji konstrukcija oslonih jastuka rezervoara, odnosno interakcija sa donjim postrojem cisterne ima na njegovo ponašanje i pouzdanost. U radu je razmatrano aktuelno stanje, uz komentar zahteva i kriterijuma koji normativno regulišu ovaj segment. Osnovni cilj rada je da ukaže na nedoslednost i nepreciznost aktuelne regulative i ponudi način za prevazilaženje uočenih problema primeren stanju tehnike u segmentu identifikacije ponašanja i verifikacije konstrukcija sa stanovišta čvrstoće. U ovom smislu predstavljena je konkretna primena razvijenog metodološkog prilaza na primeru specifičnog rešenja oslanjanja samonosećeg ADR rezervoara poluprikolice cisterne u zoni vučnog čepa, uz ilustrativno predstavljanje proračunskih odziva karakterističnih varijanti i režima opterećenja, uključujući sva potrebna pojašnjenja i komentare dobijenih rezultata.This paper analyzes load distribution throughout the tank body suspension zone. It points out the importance of influence that the design of the link between the tank wall and the base of the tank vehicle (suspension cushion zone) has on the structure behaviour and reliability. In this study, the current state is considered, giving comments on the requirements and the criteria which make a normative regulation of this segment. The basic purpose of this study is to point out the inconsistency and inaccuracy of current regulations as well as to offer a technically adequate way of resolving the stated problems in the segment of identification of behaviour and verification of construction from the strength point of view. In addition, we have illustrated how a developed methodological approach has been applied to a particular model of self-supporting ADR tank body of semi-trailers in the fifth wheel coupling pin zone, including the characteristic graphic presentation of carried out calculations and necessary explanation and comments

Novi rezultati o mogućnostima očuvanja sadržaja važnijih sastojaka mleka

Milk yield and content of main milk components are dominantly genetically determined characteristics. This fact must be considered while searching for possibilities for improving milk yield, dry matter, fat and protein. The effect of nutrition on milk yield and content of milk components is very significant. Cows with the genetic potential for production over 6 000 kg of milk in lactation show even more significant impact of this effect. Such genetic potential creates new requirements in nutrition of cows; increased feedstuff quality, inclusion of feedstuff rich in energy and protein addition of minerals, vitamins and other supplements if necessary. Application of proper herd management and working processes on the farm modern technological and technical milking solutions, housing conditions of the cows, also have effect on the milk yield and content of some milk components, mainly dry matter, fat, and partially protein. Usage of cottonseed in nutrition of cows, in amount of 1,5 kg/day contribute to the enhancement of milk production, dry matter, fat and protein in milk. For this reason, especially in nutrition of highyielding cows, use of cottonseed is justified.The limiting factor for use of cottonseed can be disorder of cereal and oilseed meal or cottonseed price parity. Use of minerals with buffer characteristics, based on natural raw minerals, with various and complementary physical and chemical characteristics, has a positive effect on enhancement of milk production, dry matter and fat content in milk. Protein content is slightly changed. Therefore, buffer supplementation especially in stressing conditions of nutrition of highyielding cows, can be fully justified.U radu se analiziraju faktori koji mogu da utiču na promenu sadržaja važnijih sastojaka mleka i prezentiraju najnoviji rezultati istraživanja o mogućnostima njihovog očuvanja. Posebna pažnja posvećena je, pored genetskih, grupi paragenetskih faktora koji se odnose na normative o potrebama grla u hranljivim materijama, kvalitetu i osobinama pojedinih hraniva i dodataka obrocima. Skrenuta je pažnja i na značaj primene odgovarajuće tehnike hranjenja krava. Izneseni su rezultati prema kojima dodatak 1,5 kg zrna pamuka u obrok krava, odnosno 3–4% mineralne predsmeše (na bazi bentonita, organozeolita, sode bikarbone i magnezijum oksida) u superkoncentrat za krave (30% ukupnih proteina) utiče na povećanje mlečne masti za 0,1–0,2 procenat poena uz adekvatno povećanje sadržaja suve materije i neznatno povećanje sadržaja proteina u mleku

Reducing the environmental impact of surgery on a global scale: systematic review and co-prioritization with healthcare workers in 132 countries

Abstract Background Healthcare cannot achieve net-zero carbon without addressing operating theatres. The aim of this study was to prioritize feasible interventions to reduce the environmental impact of operating theatres. Methods This study adopted a four-phase Delphi consensus co-prioritization methodology. In phase 1, a systematic review of published interventions and global consultation of perioperative healthcare professionals were used to longlist interventions. In phase 2, iterative thematic analysis consolidated comparable interventions into a shortlist. In phase 3, the shortlist was co-prioritized based on patient and clinician views on acceptability, feasibility, and safety. In phase 4, ranked lists of interventions were presented by their relevance to high-income countries and low–middle-income countries. Results In phase 1, 43 interventions were identified, which had low uptake in practice according to 3042 professionals globally. In phase 2, a shortlist of 15 intervention domains was generated. In phase 3, interventions were deemed acceptable for more than 90 per cent of patients except for reducing general anaesthesia (84 per cent) and re-sterilization of ‘single-use’ consumables (86 per cent). In phase 4, the top three shortlisted interventions for high-income countries were: introducing recycling; reducing use of anaesthetic gases; and appropriate clinical waste processing. In phase 4, the top three shortlisted interventions for low–middle-income countries were: introducing reusable surgical devices; reducing use of consumables; and reducing the use of general anaesthesia. Conclusion This is a step toward environmentally sustainable operating environments with actionable interventions applicable to both high– and low–middle–income countries