Istraživanje stanja zaštitne odjeće u vatrogasnim postrojbama u Republici Hrvatskoj

Zadatak ovog diplomskog rada bio je istražiti karakteristike zaštitne odjeće za vatrogasce u uvjetima uporabe. U teoretskom dijelu diplomskog rada napravljena je detaljna razrada vrsta zaštitne odjeće, nabrojane su norme za zaštitnu odjeću, opisane su ozljede koje nastaju tijekom izlaganja toplini i plamenu, odjeća za zaštitu od topline i plamena, vatrogasna odjeća, materijali i principi izrade takve odjeće, te testiranje, njega i održavanje sustava namijenjenih zaštiti od topline. Opisana je i interventna zaštitna odjeća, te inteligentna vatrogasna odjeća. U okviru eksperimentalnog dijela ovog diplomskog rada provedena je anketa o korištenju vatrogasne odjeće u profesionalnim i dobrovoljnim vatrogasnim postrojbama u Republici Hrvatskoj. Istraživanje je provedeno na 378 ispitanika, a anketirani su profesionalni i dobrovoljni vatrogasci. Anketiranje je provedeno putem web ankete. Svrha istraživanja bila je prikupiti podatke o vrsti interventne vatrogasne odjeće, načinu korištenja i održavanja, te zadovoljstvu vatrogasaca o interventnoj vatrogasnoj odjeći koju nose. Anketom je utvrđeno da su vatrogasci zadovoljni vatrogasnom odjećom koju nose

Primena I - odstojanja i koeficijenta separabilnosti u oceni poslovanja MSP u agrobiznisu

Systematic and continuous process of measuring and comparing business results of companies regarding to business results of leaders, in order to obtain information that will help the company to take action to improve its performance, is in a function of improving business operations. Accordingly, the first objective of this paper is, based on the coefficient of separability, to determine which indicators of business conditions and business results have the greatest impact on differences in the business operations of the observed SMEs operating in the food industry. The second objective of this work is to make the ranking of companies based on the business conditions and business results using discriminant analysis (I-distance), and then, to determine the overall rank of companies using general ranking coefficient (Ker). The results show that companies are significantly separated according to business results rather than to business conditions, and in addition, the business results also had a crucial impact on the overall rank of each company.Sistematski i kontinuirani proces merenja i upoređivanja poslovnih rezultata preduzeća u odnosu na poslovne rezultate lidera radi dobijanja informacija koje će pomoći preduzeću da preduzme akcije za poboljšanje svojih performansi je u funkciji unapređenja poslovanja. S tim u vezi je postavljen i prvi cilj rada, a to je da se primenom koeficijenta separabilnosti utvrdi koji pokazatelji uslova i rezultata poslovanja najviše utiču na razlike u poslovanju posmatranih MSP iz prehrambene industrije. Drugi cilj rada je da se primenom diskriminacione analize (I-odstojanja) izvrši rangiranje preduzeća na osnovu uslova kao i rezultata poslovanja, a zatim da se pomoću opšteg koeficijenta ranga (Ker) odredi opšti rang preduzeća. Rezultati analize pokazuju da se preduzeća značajnije razdvajaju prema rezultatima nego prema uslovima poslovanja, a rezultati poslovanja su takođe presudno uticali na opšti rang svakog preduzeća

Regionalni aspekt razvoja MSP agrobiznisa u Srbiji - šansa za smanjenje nezaposlenosti

Changes of the political and economic concept initiated during the 1980s and still ongoing have significantly altered the strategy of agribusiness development. The direction has switched from the development of the agro-industrial complex that is focused on socialization of agriculture and creation of large corporate business systems towards a completely opposite concept, which implies privatization and development of small and medium enterprises. Current state of small and medium size agricultural entrepreneurship in Serbia is far below its potential and below satisfactory. Underused economic potential of agriculture is a great opportunity for the development of both SMEs and the agribusiness. The ranking of districts based on the prominence level of examined parameters will enable a formation of related groups and a determination of similarities or differences in the observed regions. In this study, we used cluster analysis to determine how the districts in Serbia are grouped according to development level of small and medium agribusiness enterprises in order to obtain insight into the current state of regional development of this sector, as well as into the possibility for developing the least developed regions in Serbia. Cluster analysis yielded five homogeneous groups, whereby each cluster has its own special characteristics in terms of prominence of certain observed indicators.Promene političkog i ekonomskog koncepta koje su započete osamdesetih godina prošlog veka i traju do današnjeg dana bitno su promenile strategiju razvoja agrobiznisa. Sa koncepta razvoja agroindustrijskog kompleksa usmerenog ka podruštvljavanju poljoprivrede i stvaranju korporativnih velikih poslovnih sistema, prešlo se na sasvim suprotni koncept, odnosno privatizaciju i razvoj malih i srednjih preduzeća. Nivo razvijenosti malog i srednjeg preduzetništva u poljoprivredi Republike Srbije je daleko ispod mogućeg i zadovoljavajućeg. Veliku šansu za mala i srednja preduzeća, a samim tim i za razvoj agrobiznisa, predstavlja nedovoljno iskorišćeni ekonomski potencijal koji poseduje poljoprivreda. Rangiranje okruga prema stepenu ispoljenosti ispitivanih pokazatelja omogućiće formiranje srodnih grupa, te definisanje sličnosti ili razlike posmatranih regiona. Klaster analiza je metod koji će utvrditi kako se grupišu okruzi u Republici Srbiji prema nivou razvijenosti malih i srednjih preduzeća iz oblasti agrobiznisa i tako dobiti uvid u trenutno stanje regionalne razvijenosti ovog sektora, te mogućnosti razvoja najnerazvijenijih područja u Srbiji. Analizom grupisanja izdvojeno je pet homogenih grupa okruga, pri čemu svaki klaster ima specifičnosti u pogledu izraženosti pojedinih od posmatranih indikatora

DEA pristup rangiranju opština prema efikasnosti MSP u agrobiznisu Srbije

The most important aspect of any business is efficiency. The goal is to achieve a greater output results using less inputs, i.e. to maximize the use of available inputs. Numerous mathematical and statistical procedures, such as DEA technique (Data Envelopment Analysis), take an important place in the process of the effective management of the company and its business activities. This paper illustrated the application of DEA technique in assessing the business efficiency of SMEs in agribusiness in Vojvodina Measuring the efficiency of business operations of SMEs is based on the values of the following indicators: fixed assets, working capital, number of companies, number of employees, total income, profit and loss. The data used to calculate the values of indicators of business efficiency were obtained from the Statistical Office of the Republic of Serbia, based on the annual accounts of SMEs in agribusiness for four-year average (2008-2011). The aim of this paper is statistical assessment of business efficiency of SMEs in agribusiness using DEA technique, and then, based on the results obtained, to perform the ranking of Vojvodina municipalities in which observed SMEs were located, and finally, based on 4 models, to show sensitivity of DEA technique compared to different combination of input / output indicators, so therefore, caution is needed when this method is used. If the combination of parameters in the model is better, the results are more realistic, since if a key parameter is omitted, wrong decisions could be made.Najvažniji aspekt svakog poslovanja jeste efikasnost. Cilj je da se uz što manje ulaze postignu što veći izlazni rezultati, tj. raspoloživi ulazi maksimalno iskoriste. Brojne matematičko-statističke procedure, poput tehnike DEA (Data Envelopment Analysis) analize, zauzimaju značajno mesto u procesu merenja efikasnog upravljanja preduzećima i njegovim aktivnostima. U radu je ilustrovana primena DEA tehnike u oceni efikasnosti poslovanja MSP u agrobiznisu u Vojvodine. Merenje efikasnosti poslovanja malih i srednjih preduzeća se zasniva na vrednostima sledećih pokazatelja: stal na imovina, obrtna sredstva, broj firmi, broj zaposlenih, ukupan prihod, dobit i gubitak. Podaci koji se koriste za izračunavanje vrednosti pokazatelja efikasnosti poslovanja dobijeni su iz Zavoda za Statistiku, a na osnovu završnih računa MSP u agrobiznisu za četvrogodišnji prosek (2008-2011 god.). Cilj istraživanja ovog rada je, najpre statističko ocenjivanje efikasnosti poslovanja MSP u agrobiznisu primenom DEA tehnike, a zatim da se na osnovu dobijenih rezultata izvrši rangiranje opština Vojvodine kojima pripadaju posmatrana MSP i najzad da se na osnovu 4 modela pokaže koliko je DEA tehnika osetljiva metodologija na promenu kombinacija ulazno/izlaznih indikatora, zbog čega se mora biti vrlo obazriv u primeni iste. Što je kombinacija parametara u modelu bolja to su i rezultati realniji, jer ako se izostavi neki ključan parametar mogu se doneti pogrešne odluke

Masnokiselinski profili fosfolipida i parametri oksidativnog stresa u krvi i jetri pacova Wistar soja tretiranih ribljim uljem

Polyunsaturated fatty acids, especially eicosapentanoic acid (EPA) and dosahexanoic acid (DHA) which are the content of fish oil and belong to the n-3 fatty acid family. n-3 are known to have effect on physiological parameters. The balance of the n-6/n-3 ratio in phospholipids, as well as the balance between reactive oxygen species and reactive nitric species on the one side and on the anti oxidative defense on the other is important for the normal function of organism. Wistar rats (3 and 22 months) were supplemented with fish oil (EPA+DHA and vitamin E) over the period of 6 weeks. Biochemical parameters in plasma, fatty acid phospholipids profiles and the parameters of oxidative stress in blood and liver were examined. In young rats plasma concentrations of cholesterol, HDL-cholesterol and triglycerides in plasma were increased compared to aged rats. Fish oil treatment increased HDL-cholesterol, uric acid and LDL-cholesterol in both groups of animals (3 and 22 months). Treatment decreased triglycerides concentrations in young rats and decreased plasma cholesterol in aged rats. Senescence increased LA, AA and n-6 FA. Fish oil treatment increased EPA, DPA, decreased AA in plasma phospholipids in both group of animals. In young rats treatment increased oleic acid while in aged it increased DGLA. Senescence decreased n-3 FA and the n-6/n-3 ratio in liver phospholipids. Treatment increased EPA, DPA, n-3 and decreased AA in liver phospholipids in both group of animals. In young rats, treatment increased MUFA while in aged rats it increased SFA and PUFA. Senescence also increased lipid peroxidation in liver cells, as well as SOD activity and nitrite concentration while the activity of PON1 in plasma is increased in young rats compared to aged Wistar rats. Fish oil treatment in both groups of rats (3 and 22 months) decreased lipid peroxidation, concentration of plasma nitrite and LDH5 and increased SOD, CAT, PON1 activity in blood. Treatment decreased lipid peroxidation, nitrite concentration in liver of both groups of rats. In young rats treatment also decreased CAT activity and increased PON1. In aged rats treatment increased CAT, SOD activity, concentration of SH groups while PON activity decreased compared to control...Polinezasićene masne kiseline, posebno eikozapentaenska (EPA) i dokozaheksaenska (DHA) masna kiselina koje ulaze u sastav ribljeg ulja i pripadaju n-3 familiji masnih kiselina, imaju efekte na čitav niz fizioloških parametara. Značaj balansa odnosa n-6/n-3 masnih kiselina u fosfolipidima kao i balans izmeñu produkcije reaktivnih kiseoničnih vrsta i reaktivnih azotnih vrsta s jedne i antoksidativne zaštite s druge strane je od važnosti za normalno funkcionisanje organizma. Suplementirali smo pacove Wistar soja dve starosne dobi (3 i 22 meseca) u trajanju od 6 nedelja sa ribljim uljem (EPA+DHA i vitamin E). Ispitivani su biohemijski parametri plazme, masnokiselinski profili fosfolipida plazme i jetre kao i parametri oksidativnog stresa u krvi i jetri pomenutih životinja. Dobijeni rezultati su pokazali više vrednosti holesterola, HDL- holesterola i triglicerida u plazmi mladih pacova u odnosu na stare. Tretman ribljim uljem doveo je do povišenja HDL-holesterola, koncentracije mokraćne kiseline i sniženja LDL-holesterola kod obe grupe tretiranih životinja dok je kod mladih tretman izazvao sniženje koncentracije triglicerida a kod starih sniženje holesterola. Starenjem, povećava se sadržaj linolne, arahidonske kiseline kao i ukupnih n-6 MK. Tretman ribljim uljem, doveo je do povećanja sadržaja EPA, DPA, sniženja koncentracije arahidonske kiseline u fosfolipidima plazme u obe starosne grupe životinja. Sadržaj oleinske kiseline je kod mladih pacova tretmanom povižen, dok je kod starih pacova došlo do povećanja dihomo-γ- linolenske kiseline. Starenjem, snižava se i sadržaj ukupnih n-3 MK i odnos n-6/n-3 u fosfolipidima jetre. Tretman u životinja obe starosne dobi doveo je do povećanja sadržaja EPA, DPA, ukupnih n-3, smanjenja sadržaja arahidonske kiseline u fosfolipidima jetre. Kod mladih tretman je povećao sadržaj MUFA, a kod starih SFA i PUFA. Starenjem, povećava se lipidna peroksidacija u hepatocitima, kao i aktivnost SOD i koncentracija nitrita, dok je aktivnost PON1 u plazmi veća kod mladih pacova što je u korelaciji sa višim vrednostima HDL-holesterola u odnosu na stare pacove. Tretman ribljim uljem kod pacova obe starosne dobi doveo je do sniženja lipidne peroksidacije, koncentracije plazma nitrita i zastupljenosti LDH5 izoenzimskog oblika a do povišenja aktivnosti SOD, CAT i PON1 u krvi tretiranih životinja u odnosu na kontrolnu grupu..

Razlike u temperamentu i karakteru kod adolescenata sa raznim poremećajima ponašanja

Background/Aim. Adolescence is characterized both by a large developmental potential and by an increased risk for emergence of different forms of psychopathology. International classifications of mental disorders recognize the psychopathology of adolescence at the age of 15-18 through the categories of conduct disorders and some forms of addiction: chemical and non-chemical. The aim of this research was to analyse the personality structure among four groups of adolescents manifesting different types of conduct disorder based on Cloninger's Psychobiological theory of personality. Methods. The research sample consisted of 140 respondents at the age of 16-18, divided into five groups: 30 respondents manifesting socialized conduct disorder, 20 adolescents in conflict with the law, 30 respondents manifesting abuse of psychoactive substances, 30 respondents with the problem of the Internet addiction and 30 from general population. The Belgrade Adolescent Personality Inventory (BAPI) questionnaire was used for the purpose of assessment of personality. Multivariate analysis of variance (MANOVA), followed by univariate analysis of variance (ANOVA) was used to examine differences between the given groups of adolescents. Results. The results of MANOVA show differences in the personality structure among the groups, both in the dimensions of temperament, F (20,418.84) = 2.71, p lt 0.001, Wilks's lambda 0.67, and in the dimensions of character, F (12,344.24) = 3.27,p lt 0.001, Wilks's lambda is 0.75. Socialized conduct disorder is characterized by low self-directedness and average cooperativeness. Adolescents in conflict with the law have the lowest persistence, together with low self-directedness and cooperativeness. Adolescents abusing psychoactive substances have low harm avoidance and self-transcendence. Adolescents with Internet addiction are characterized by high novelty seeking (impulsivity and curiosity), low self-directedness and the lowest cooperativeness. Conclusion. The results show that the dimensions of personality can play an important role in etiopathogenesis of various disorders in adolescents.Uvod/Cilj. Adolescenciju karakteriše veliki razvojni potencijal, ali i pojačani rizik od formiranja različitih vidova psihopatologije. Psihopatologiju adolescencije uzrasta od 15 do 18 godina, međunarodne klasifikacije mentalnih poremećaja prepoznaju kroz kategorije poremećaja ponašanja i neke vidove bolesti zavisnosti: hemijskih i nehemijskih. Cilj istraživanja bio je da se na osnovu Klonindžerove psihobiološke teorije ličnosti analizira struktura ličnosti kod četiri grupe adolescenata koji manifestuju različite oblike poremećaja ponašanja. Metode. Uzorak istraživanja sastojao se od 140 ispitanika uzrasta od 16 do 18 godina, podeljenih u pet grupa: 30 ispitanika koji su manifestovali socijalizovani poremećaj ponašanja, 20 adolescenata sa poremećajem ponašanja u sukobu sa zakonom, 30 ispitanika sa problemom zloupotrebe psihoaktivnih supstanci, 30 ispitanika sa problemom zavisnosti od interneta i 30 ispitanika kontrolne grupe. Za procenu strukture ličnosti korišćen je upitnik Belgrade Adolescent Personality Inventory (BAPI). Razlike između grupa adolescenata ispitane su multivarijatnom (MANOVA) i univarijatnom (ANOVA) analizom varijanse. Rezultati. Rezultati multivarijatne analize varijanse pokazuju da postoje razlike u strukturi ličnosti između svih grupa, kako na dimenzijama temperamenta, F(20,418.84) = 2.71,p lt 0.001, Vilksova lambda 0,67, tako i na dimenzijama karaktera, F (12,344.24) = 3,27, p lt 0,001, Vilksova lambda 0,75. Socijalizovani poremećaj ponašanja karakteriše niska samousmerenost, Ali prosečna kooperativnost. Adolescenti u sukobu sa zakonom imaju najnižu perzistenciju, kao i nisku samousmerenost i kooperativnost. Adolescenti koji zloupotrebljavaju psihoaktivne supstance imaju nisko izbegavanje štete i autotranscedenciju. Za adolescente sa internet zavisnošću karakteristična je visoka potraga za novinama (impulsivnost i radoznalost), niska samousmerenost i najniža kooperativnost. Zaključak. Rezultati ukazuju da dimenzije ličnosti mogu igrati značajnu ulogu u etiopatogenezi različitih poremećaja adolescenata

Fatty acids phospholipids profiles and parameters of oxidative stress in blood and liver in Wistar rats treated with fish oil

Polinezasićene masne kiseline, posebno eikozapentaenska (EPA) i dokozaheksaenska (DHA)masna kiselina koje ulaze u sastav ribljeg ulja i pripadaju n-3 familiji masnih kiselina, imajuefekte na čitav niz fizioloških parametara. Značaj balansa odnosa n-6/n-3 masnih kiselina ufosfolipidima kao i balans izmeñu produkcije reaktivnih kiseoničnih vrsta i reaktivnih azotnihvrsta s jedne i antoksidativne zaštite s druge strane je od važnosti za normalno funkcionisanjeorganizma.Suplementirali smo pacove Wistar soja dve starosne dobi (3 i 22 meseca) u trajanju od 6 nedeljasa ribljim uljem (EPA+DHA i vitamin E). Ispitivani su biohemijski parametri plazme,masnokiselinski profili fosfolipida plazme i jetre kao i parametri oksidativnog stresa u krvi i jetripomenutih životinja.Dobijeni rezultati su pokazali više vrednosti holesterola, HDL- holesterola i triglicerida u plazmimladih pacova u odnosu na stare. Tretman ribljim uljem doveo je do povišenja HDL-holesterola,koncentracije mokraćne kiseline i sniženja LDL-holesterola kod obe grupe tretiranih životinjadok je kod mladih tretman izazvao sniženje koncentracije triglicerida a kod starih sniženjeholesterola.Starenjem, povećava se sadržaj linolne, arahidonske kiseline kao i ukupnih n-6 MK. Tretmanribljim uljem, doveo je do povećanja sadržaja EPA, DPA, sniženja koncentracije arahidonskekiseline u fosfolipidima plazme u obe starosne grupe životinja. Sadržaj oleinske kiseline je kodmladih pacova tretmanom povižen, dok je kod starih pacova došlo do povećanja dihomo-γ-linolenske kiseline. Starenjem, snižava se i sadržaj ukupnih n-3 MK i odnos n-6/n-3 u fosfolipidima jetre. Tretman u životinja obe starosne dobi doveo je do povećanja sadržaja EPA,DPA, ukupnih n-3, smanjenja sadržaja arahidonske kiseline u fosfolipidima jetre. Kod mladihtretman je povećao sadržaj MUFA, a kod starih SFA i PUFA.Starenjem, povećava se lipidna peroksidacija u hepatocitima, kao i aktivnost SOD i koncentracijanitrita, dok je aktivnost PON1 u plazmi veća kod mladih pacova što je u korelaciji sa višimvrednostima HDL-holesterola u odnosu na stare pacove. Tretman ribljim uljem kod pacova obestarosne dobi doveo je do sniženja lipidne peroksidacije, koncentracije plazma nitrita izastupljenosti LDH5 izoenzimskog oblika a do povišenja aktivnosti SOD, CAT i PON1 u krvitretiranih životinja u odnosu na kontrolnu grupu...Polyunsaturated fatty acids, especially eicosapentanoic acid (EPA) and dosahexanoic acid(DHA) which are the content of fish oil and belong to the n-3 fatty acid family. n-3 are known tohave effect on physiological parameters. The balance of the n-6/n-3 ratio in phospholipids, aswell as the balance between reactive oxygen species and reactive nitric species on the one sideand on the anti oxidative defense on the other is important for the normal function of organism.Wistar rats (3 and 22 months) were supplemented with fish oil (EPA+DHA and vitamin E) overthe period of 6 weeks. Biochemical parameters in plasma, fatty acid phospholipids profiles andthe parameters of oxidative stress in blood and liver were examined.In young rats plasma concentrations of cholesterol, HDL-cholesterol and triglycerides in plasmawere increased compared to aged rats. Fish oil treatment increased HDL-cholesterol, uric acidand LDL-cholesterol in both groups of animals (3 and 22 months). Treatment decreasedtriglycerides concentrations in young rats and decreased plasma cholesterol in aged rats.Senescence increased LA, AA and n-6 FA. Fish oil treatment increased EPA, DPA, decreasedAA in plasma phospholipids in both group of animals. In young rats treatment increased oleicacid while in aged it increased DGLA. Senescence decreased n-3 FA and the n-6/n-3 ratio inliver phospholipids. Treatment increased EPA, DPA, n-3 and decreased AA in liverphospholipids in both group of animals. In young rats, treatment increased MUFA while in agedrats it increased SFA and PUFA.Senescence also increased lipid peroxidation in liver cells, as well as SOD activity and nitriteconcentration while the activity of PON1 in plasma is increased in young rats compared to agedWistar rats. Fish oil treatment in both groups of rats (3 and 22 months) decreased lipidperoxidation, concentration of plasma nitrite and LDH5 and increased SOD, CAT, PON1 activity in blood. Treatment decreased lipid peroxidation, nitrite concentration in liver of bothgroups of rats. In young rats treatment also decreased CAT activity and increased PON1. In agedrats treatment increased CAT, SOD activity, concentration of SH groups while PON activitydecreased compared to control..

Influence of an accumulative roll bonding (ARB) process on the properties of AA5083 Al-Mg alloy sheets

In this study, fully annealed AA5083 type alloy sheets with 1 mm in thickness were processed by accumulative roll bonding (ARB) at room temperature, up to 6 ARB cycles. It was found that microstructure was refined and mechanical properties were significantly improved with ARB processing. The maximum achieved values of hardness and tensile strength were two and three times greater than that of the initial material, respectively. This was attributed to the intensive strain hardening and grain size refinement which occurred during ARB deformation. However, the uniform elongation values were decreased by increasing the number of ARB cycles, and early fracture was registered. SEM fractography of fractured surfaces after tensile tests revealed a typical ductile fracture of ARB processed specimens, which was changed with ARB deformation. It was observed that ductile area on the fractured surfaces and the amount of necking, which occured before fracture, were decreased with increasing the number of ARB cycles.  http://dx.doi.org/10.5937/metmateng1404285

Beneficial properties of zeolite

Our focus was to obtain an overall picture of the different beneficial properties of zeolite, based on its chemical and physical characteristics, which depend on zeolite absorption and exchange of ions. These characteristics make them very useful for various applications, including agriculture (as an animal feed additive and in food technology production), veterinary and human medicine, ecology, certain manufacturing, and cosmetics. Zeolite has pleiotropic effects, and the most important of them are detoxifying, antioxidant, and anti-inflammatory roles. We wanted to underline, with the review of the scientific literature, the positive medical beneficial effects of zeolite on the general health status