Projektiranje posmične osi kod CNC alatnih strojeva

Primjena principa razvijenih za posmična gibanja kod numerički upravljanih alatnih strojeva za konvencionalne postupke obrade je vrlo široka. Veliki broj današnjih uređaja i strojeva (strojevi za RP postupke, strojevi za nekonvencionalne obrade, razni uređaji za rukovanje i pozicioniranje dijelova, itd.) koriste rješenja prisutna kod posmičnih osi C\NC alatnih strojeva. Pri tome se, ovisno o namjeni i ulaznim podacima, mogu koristiti različite izvedbe za pojedine komponente koje se ugrađuju u posmične osi. U radu se provodi razmatranje mogućih mjernih sustava koji su danas u uporabi. \Njihove karakteristike nam daju uvid u njihove mogućnosti, te se na temelju potreba treba izabrati odgovarajući mjerni sustav. Također treba imati u vidu greške koje se pojavljuju u pojedinim elementima sustava tokom eksploatacije. Izbor mjernog sustava, te ostalih elemenata jedne posmične osi stroja, mora rezultirati većom produktivnosti stroja, smanjenjem troškova obrade, produljenjem životnog vijeka alata, te povećanjem kvalitete obrade a time i kvalitete izratka

Utjecaj mjerne sile na rezultate mjerenja unutarnjih i vanjskih promjera

U Laboratoriju za precizna mjerenja dužina veliki dio mjerenja odnosi se na 1D kontaktna mjerenja. Svako kontaktno mjerenje podrazumijeva primjenu mjerne sile koja u većoj ili manjoj mjeri utječe na mjerni rezultat i njegovu nesigurnost. Ovaj utjecaj ovisi ponajprije o iznosu primijenjene sile i metodi mjerenja. Pri usporedbenim mjerenjima smatra se da je ovaj utjecaj zanemariv dok se kod neposrednih mjerenja provodi korekcija rezultata mjerenja temeljem Hertz-ovh jednadžbi. Dugogodišnje iskustvo laboratorija u mjerenju promjera ukazuje na probleme vezane uz primjenu korekcije zbog utjecaja mjerne sile. U radu je provedeno istraživanje utjecaja mjerne sile na rezultat mjerenja promjera mjernih valjčića, promjera prstena i srednjeg promjera vanjskog navoja. Uz analitičke modele izvedene na osnovi Hertz-ovih jednadžbi izrađeni su i modeli utjecaja mjerne sile pri mjerenju valjčića i promjera prstena primjenom numeričke metode konačnih elemenata. U eksperimentalnom dijelu provedena su mjerenja valjčića različitih promjera s tri različite mjerne sile kako bi se pokazalo u kojoj mjeri je moguće postići podudarnost rezultata mjerenja s rezultatima dobivenim simulacijama

The Association Between Morphology, Speed, Power and Agility in Young Tennis Players

The aim of this study was to investigate the correlation of anthropometric variables and motor abilities in change of direction speed and reactive agility performance in young tennis players. 50 tennis players (age 12.3 ± 1.2 years, height 156.7 ± 12.8 cm, body mass 45.9 ± 8.9 kg), who were ranked within the top 50 ranking places of the National Tennis Association, as well as within the top 300 on the international "Tennis Europe" rankings, participated in the study. The sample of anthropometric variables in this study comprised the measurement of participant height, body mass, body mass index and percentage of body fat. Also, participants performed tests assessing speed (5, 10, and 20 m sprints), agility (20 yards, 4x10 yards, T–test, TENCODS, and TENRAG), and explosive power (countermovement jump, single-leg countermovement jump, squat jump, standing long jump and single-leg triple jump). The results showed that there is a statistically significant correlation of agility with anthropometric characteristics, running speed tests and horizontal explosive power variables, whereas there was no significant correlation with vertical explosive power variables. In conclusion, the results of this research confirmed the hypothesis that there is a significant correlation in almost all anthropometric variables and motor abilities in change of direction speed and reactive agility performance in young tennis players. Thus, our findings provide useful information for coaches to create a wide range of tennis-specific exercises to develop performance, especially in a players neuromuscular fitness

POSLOVNA KRIZA I INSOLVENTNOST KOMPANIJA : Diplomski rad

Gospodarske krize imaju snažne efekte na kompanije i građane. One uzrokuju krize u poslovanju kompanija te dovode do problema insolventnosti u kojima kompanije nisu u mogućnosti zatvoriti dospjele obveze, bivaju blokirane od strane Financijske agencije i posljedično završavaju u stečaju te se gase. Da bi se poslovne krize ublažile ili izbjegle, postoje instrumenti izvan kompanije koji se preventivno brinu o njenom poslovanju te svojim djelovanjem naslućuju krizna stanja ili se bave rješenjima nastale krize. U tom kontekstu može se spomenuti uloga Financijske agencije koja daje informacije o bonitetu poslovnih subjekata, ali i uloga Vlade Republike Hrvatske čijim je djelovanjem definiran zakon o predstečajnoj nagodbi i stečajnom postupku. S druge strane, kompanije su dužne i same izrađivati financijske izvještaje pomoću kojih mogu planirati svoje poslovanje i tako se pripremiti za dolazak turbulentnih razdoblja. Krizna stanja unutar kompanija odražavaju se i na njihove zaposlenike, odnosno građane. Građani su visoko zaduženi i ovise o dijelu dohotka koji im je najviši, a to su plaće. Plaćama podmiruju tekuće obveze i obveze iz prošlosti, ali i obveze koje nastaju u budućnosti. Iz tog razloga insolventnost kompanija utječe i na insolventnost građana te se i oni aktivnijim nastupom na tržištu mogu pripremati za krizna vremena i tako ih učinkovitije prebroditi.Economic crises have strong impacts on companies and citizens. They cause crises in the business and lead to insolvency problems in which companies are unable to close their debts, then they are blocked by the Financial Agency and consequently they end up in bankruptcy. In order to alleviate or avoid a business crisis, there are instruments outside of a company that preventively take care of its business, and with its action they are talking about crisis situations or dealing with crisis-solving solutions. In this context, the role of the Financial Agency, which provides information on the creditworthiness of business entities, as well as on the role of the Government of the Republic of Croatia, which has defined the law on pre-bankruptcy and bankruptcy proceedings, can be mentioned. On the other hand, companies are obliged to produce financial statements themselves to plan their business and prepare for the coming of turbulent periods. Crisis situations within the company also reflect on their employees or citizens. Citizens are heavily indebted and they depend on the share of their highest income, which are wages. With their wages they are paying current liabilities and obligations from the past, but also the obligations that arise in the future. For this reason, the insolvency of the company also affects the insolvency of the citizens, and they can also prepare themselfs better for crisis times in the market and thus more efficiently overcome them

POSLOVNA KRIZA I INSOLVENTNOST KOMPANIJA : Diplomski rad

Gospodarske krize imaju snažne efekte na kompanije i građane. One uzrokuju krize u poslovanju kompanija te dovode do problema insolventnosti u kojima kompanije nisu u mogućnosti zatvoriti dospjele obveze, bivaju blokirane od strane Financijske agencije i posljedično završavaju u stečaju te se gase. Da bi se poslovne krize ublažile ili izbjegle, postoje instrumenti izvan kompanije koji se preventivno brinu o njenom poslovanju te svojim djelovanjem naslućuju krizna stanja ili se bave rješenjima nastale krize. U tom kontekstu može se spomenuti uloga Financijske agencije koja daje informacije o bonitetu poslovnih subjekata, ali i uloga Vlade Republike Hrvatske čijim je djelovanjem definiran zakon o predstečajnoj nagodbi i stečajnom postupku. S druge strane, kompanije su dužne i same izrađivati financijske izvještaje pomoću kojih mogu planirati svoje poslovanje i tako se pripremiti za dolazak turbulentnih razdoblja. Krizna stanja unutar kompanija odražavaju se i na njihove zaposlenike, odnosno građane. Građani su visoko zaduženi i ovise o dijelu dohotka koji im je najviši, a to su plaće. Plaćama podmiruju tekuće obveze i obveze iz prošlosti, ali i obveze koje nastaju u budućnosti. Iz tog razloga insolventnost kompanija utječe i na insolventnost građana te se i oni aktivnijim nastupom na tržištu mogu pripremati za krizna vremena i tako ih učinkovitije prebroditi.Economic crises have strong impacts on companies and citizens. They cause crises in the business and lead to insolvency problems in which companies are unable to close their debts, then they are blocked by the Financial Agency and consequently they end up in bankruptcy. In order to alleviate or avoid a business crisis, there are instruments outside of a company that preventively take care of its business, and with its action they are talking about crisis situations or dealing with crisis-solving solutions. In this context, the role of the Financial Agency, which provides information on the creditworthiness of business entities, as well as on the role of the Government of the Republic of Croatia, which has defined the law on pre-bankruptcy and bankruptcy proceedings, can be mentioned. On the other hand, companies are obliged to produce financial statements themselves to plan their business and prepare for the coming of turbulent periods. Crisis situations within the company also reflect on their employees or citizens. Citizens are heavily indebted and they depend on the share of their highest income, which are wages. With their wages they are paying current liabilities and obligations from the past, but also the obligations that arise in the future. For this reason, the insolvency of the company also affects the insolvency of the citizens, and they can also prepare themselfs better for crisis times in the market and thus more efficiently overcome them

Design Principle for Additive Manufacturing: Direct Metal Sintering

Additive Manufacturing (AM) brought new design possibilities and freedom to the product design process. However, as the existing design rules and design limitations do not apply to the AM, designers require new methods and tools to utilise the full potential of AM. The stated is especially noticeable in the design of metal products made with AM, particularly with the Direct Metal Laser Sintering (DMLS) process. The research proposes a methodological approach for analysing the existing DMLS products made with DMLS to extract design knowledge. The methodology is applied to the pool of DMLS from which 15 design principles are extracted that formalise design knowledge about DMLS. The design principles are intended to be used in the early design stages of the design process as a source of design knowledge and inspiration for conceptualising new and innovative products that will be made using DMLS

Comparison of efficacy and three year retention rate of TNF-α inhibitors in treatment of ankylosing spondylitis

Cilj: Svrha rada bila je utvrditi i usporediti učinkovitost te preživljenje TNF-α (engl. tumor necrosis factor-α) inhibitora (adalimumab, golimumab, infliksimab) tijekom trogodišnjeg praćenja u liječenju ankilozantnog spondilitisa. Materijali i metode: Ovim retrospektivnim istraživanjem obuhvaćena je skupina od 29 ispitanika koji su primili prvi biološki lijek na Odjelu reumatologije i kliničke imunologije Kliničkog bolničkog centra Rijeka. Započeli su s biološkim lijekom u razdoblju od siječnja 2009. do lipnja 2015. godine i bili praćeni tri godine nakon početka terapije. Parametri kojima se pratila aktivnost bolesti bili su BASDAI (engl. Bath Ankylosing Spondylitis Disease Activity Index), BASFI (engl. Bath Ankylosing Spondylitis Functional Index), CRP (engl. C reactive protein) i VAS (engl. Visual Analogue Scale), a mjereni su prije početka terapije te nakon 3 i 36 mjeseci od njenog uvođenja. Rezultati: Od ukupno 29 ispitanika, 11 ih je bilo na adalimumabu, 10 na golimumabu, a 8 na infliksimabu. Analizirajući parametre uključene u ovo istraživanje (BASDAI, BASFI, CRP, VAS), ni u jednom promatranom periodu nije zabilježena statistički značajna razlika između ispitanika s obzirom na primijenjeni TNF-α inhibitor (svi p > 0,05). Ukupno trogodišnje preživljenje TNF-α inhibitora iznosilo je 75,8 %. Kod ispitanika liječenih adalimumabom trogodišnje preživljenje iznosilo je 72,8 %, za golimumab 80 % te infliksimab 75 % (svi p > 0,05). Zaključci: Uspoređujući ispitanike liječene adalimumabom, golimumabom i infliksimabom u prvoj liniji biološke terapije, naše istraživanje na malom broju ispitanika pokazalo je kako nema značajne razlike u njihovoj učinkovitosti i preživljenju.Aim: Our goal was to compare efficacy and retention rate of TNF-α (tumor necrosis factor-α) inhibitors (adalimumab, golimumab, infliximab) during three-year follow-up in treatment of ankylosing spondylitis. Materials and methods: This retrospective study includes 29 patients who received first biological drug at Department of Rheumatology at Clinical Hospital Center Rijeka. They started with biological drug in the period from 1/2009-6/2015 and were followed for three years after the onset of therapy. Disease activity was measured with BASDAI (Bath Ankylosing Spondylitis Disease Activity Index), BASFI (Bath Ankylosing Spondylitis Functional Index), CRP (C reactive protein) and VAS (Visual Analogue Scale) on week 0, then 3 and 36 months after first therapy. Results: Among 29 patients 11 were on adalimumab, 10 on golimumab, and 8 on infliximab. By analyzing the parameters included in this study (BASDAI, BASFI, CRP, VAS) and considering the TNF-α inhibitor which has been used, there is no statistically significant difference in any observed period (all p values>0,05). Overall 3 years retention rate for TNF-α inhibitors was 75,8 %. In patients treated with adalimumab 3 years retention rate was 72,8 %, for golimumab was 80 % and for infliximab 75 % (all p values>0,05). Conclusions: Comparing patients treated with adalimumab, golimumab and infliximab as first line of biological therapy, our study on small number of patients has shown that there is no significant difference in their efficacy and retention rate

Toward a complete description of b → uℓ− v within the Weak Effective Theory decays

We fit the available data on exclusive semileptonic b → uℓ −ν¯ decays within the Standard Model and in the Weak Effective Theory. Assuming Standard Model dynamics,we find |Vub| = 3.59+0.13−0.12 × 10−3. Lifting this assumption, we obtain stringent constraintson the coefficients of the ub`ν sector of the Weak Effective Theory. Performing a Bayesian model comparison, we find that a beyond the Standard Model interpretation is favoured over a Standard Model interpretation of the available data. We provide a Gaussian mixturemodel that enables the efficient use of our fit results in subsequent analyses beyond the Standard Model, within and beyond the framework of the Standard Model Effective Field Theory