51. A new somatic cell count index to more accurately predict milk yield lossesJanez Jeretina, Dejan Škorjanc, Drago Babnik, 2017, izvirni znanstveni članek Opis: Intramammary infection and clinical mastitis in dairy cows leads to considerable economic losses for farmers. The somatic cell concentration in cow's milk has been shown to be an excellent indicator for the prevalence of subclinical mastitis. In this study, a new somatic cell count index (SCCI) was proposed for the accurate prediction of milk yield losses caused by elevated somatic cell count (SCC). In all, 97238 lactations (55207 Holstein cows) from 2328 herds were recorded between 2010 and 2014 under different scenarios (high and low levels of SCC, four lactation stages, different milk yield intensities, and parities (1, 2, and _>3). The standard shape of the curve for SCC was determined using completed standard lactations of healthy cows. The SCCI was defined as the sum of the differences between the measured interpolated values of the natural logarithm of SCC (ln(SCC)) and the values for the standard shape of the curve for SCC for a particular period, divided by the total area enclosed by the standard curve and upper limit of ln(SCC)=10 for SCC. The phenotypic potential of milk yield (305-day milk yield - MY305) was calculated using regression coefficients estimated from the linear regression model for parity and breeding values of cows for milk yield. The extent of daily milk yield loss caused by increased SCC was found to be mainly related to the early stage of lactation. Depending on the possible scenarios, the estimated milk yield loss from MY305 for primiparous cows was at least 0.8 to 0.9 kg day -1 and for multiparous cows it ranged from 1.3 to 4.3 kg day-1. Thus, the SCCI was a suitable indicator for estimating daily milk yield losses associated with increased SCC and might provide farmers reliable information to take appropriate measures for ensuring good health of cows and reducing milk yield losses at the herd level. Ključne besede: dairy cows, milk production, lactation intervals, milk yield losses, somatic cell count index Objavljeno v DKUM: 24.10.2017; Ogledov: 1593; Prenosov: 486
Celotno besedilo (317,33 KB) Gradivo ima več datotek! Več... |
52. Forenzično jezikoslovje: algoritmizirano jezikovnostilno ugotavljanje profila tvorcev spletnih komentarjevMarko Drobnjak, 2017, magistrsko delo Opis: Splet predstavlja spremembo v komunikaciji, stilu sporočanja in tvorjenju besedil. Zaradi formalizirane anonimnosti, ki jo omogoča spletni prostor, se čedalje težje odkriva avtorje diskurzov in besedil na spletu, saj hibridna oblika posredovanja informacij z novo metabesedilnostjo zahteva najaktualnejše pristope pri ugotavljanju avtorstva tovrstnih besedil. V magistrskem delu smo zato v teoretsko jezikoslovno izhodišče uvedli Foucaultovo (arheologijo) vednost(i) s področja jezika in diskurza ter v nadaljevanju upoštevali Unukov pogled na stil, ostalo splošno jezikoslovno teorijo pa smo dopolnili s ključnimi spoznanji s področja forenzičnega jezikoslovja in forenzične stilistike. V aplikativni razsežnosti magistrskega dela smo skozi statistične, korpusne in ostale forenzične analize vseskozi upoštevali načela objektivnosti, relevantnosti ter samokritike po Keržanu. Ustreznost teoretskega koncepta pri obravnavani problematiki magistrskega dela se je potrdila skozi raziskovalni del, saj smo prišli do rezultatov, ki kažejo na potencialno vrednost uporabljene metodologije pri ugotavljanju stilnih razlikovanj med besedilnimi vrstami, komentarji na spletnih straneh in na splošno med vsemi besedili. Predstavljene stilne vrednosti omogočajo tudi prepoznavanje avtorstva besedil(a) in ugotavljanje stilnega profila tvorcev spletnih komentarjev. Ključne besede: analiza diskurza, forenzično jezikoslovje, besedilna stilistika, kvantitativna besedilna analiza, profiliranje avtorja Objavljeno v DKUM: 06.10.2017; Ogledov: 2275; Prenosov: 304
Celotno besedilo (1,69 MB) |
53. Slovenski jezik v sočasnem sporazumevalnem prostoruDrago Unuk, 2016, izvirni znanstveni članek Opis: Družbene spremembe, sporazumevalna pomnožitev in tehnološke spremembe so ustvarile stopnjevano potrebo po večji dinamičnosti in variantnosti tudi v jeziku in z jezikom. Sočasno sporazumevanje temelji na govornosti, ki spreminja pojmovanje standardiziranosti jezika, ta je tradicionalno temeljila na pisnosti. Statična standardizirana različica postaja manj pomembna, družbena in sporazumevalna dinamika proizvajata drugačne in nove različice jezika, te se močno notranje razčlenjujejo in interferirajo pod izrazitejšim vplivom standardnega jezika (zemljepisna narečja), mednarodnosti sporazumevanja in kompleksne dejavnosti nosilcev (družbena narečja). V javno sfero se opazno širi pogovornost. Izrazito se povečuje število poklicnih poimenovanj, ki nastopajo kot najbolj dinamični del besedišča, obenem pa narašča njihovo vstopanje v druge jezikovne različice in stile sporočanja. Posameznik z jezikom uresničuje tako svojo individualnost in ustvarjalnost kot pripadnost družbeni in kulturni skupini v aktualnem sporazumevalnem prostoru. Pomembnost vloge jezika v izobraževalnem procesu se kaže v dejstvu, da je jezik tudi način pridobivanja in oblikovanja znanja. Ključne besede: sociolingvistika, jezikovna dinamika, variantnost jezika, pogovornost, digitalne tehnologije Objavljeno v DKUM: 26.09.2017; Ogledov: 1262; Prenosov: 138
Celotno besedilo (214,69 KB) Gradivo ima več datotek! Več... |
54. Comparison of methods for determination of polyphenols in wine by HPLC-UV/VIS, LC/MS/MS and spectrophotometryVesna Mila Meden, Matija Strlič, Drago Kočar, 2009, izvirni znanstveni članek Opis: Phenolic antioxidants are usually grouped into flavonoids and non-flavonoids, according to their structure. With regard to the tannic character, phenolic antioxidants are further subdivided to tannic phenols and non-tannic phenols. Collectively, these compounds contribute to the high antioxidant capacity of wine.
In this work, we compare determination of gallic acid, catechin, epicatechin, resveratrol, quercetin, dihydrobenzoic acid, sinapic acid, vanillic acid, caffeic acid, chlorogenic acid, ferullic acid, ellagic acid, p-coumaric acid and caftaric acid in 141 wine samples using two liquid chromatographic methods and detection systems, i.e. with UV detection and mass-spectrometric detection. In addition, we applied the conventional Folin-Ciocalteu spectrophotometric method for determination of the total phenolic content in wine samples and compared the results with those obtained using the chromatographic methods.
Despite satisfactory correlations statistically significant differences between HPLC-UV/VIS and LC/MS/MS were established, which could be related to coelution not detectable with UV/VIS detectors. The correlations between results of the spectrophotometric method and sum of LC/MS/MS determinations are not satisfactory and are different for white, red, and rosé wines. Ključne besede: food analysis, wine, antioxidants, chromatography Objavljeno v DKUM: 17.08.2017; Ogledov: 2207; Prenosov: 169
Celotno besedilo (185,67 KB) Gradivo ima več datotek! Več... |
55. Suitability of the double Langevin function for description of anhysteretic magnetization curves in NO and GO electrical steel gradesSimon Steentjes, Martin Petrun, G. Glehn, Drago Dolinar, Kay Hameyer, 2017, izvirni znanstveni članek Opis: This paper compares the match obtained using the classical Langevin function, the tanh function as well as a recently by the authors proposed double Langevin function with the measured anhysteretic magnetization curve of three different non-oriented electrical steel grades and one grain-oriented grade. Two standard non-oriented grades and a high-silicon grade (Si content of 6.5%) made by CVD are analyzed. An excellent match is obtained using the double Langevin function, whereas the classical solutions are less appropriate. Thereby, problems such as those due to propagation of approximation errors observed in hysteresis modeling can be bypassed. Ključne besede: polarization, magnetization measurement, magnetic materials, hysteresis models, Langevin function, electrical steel, saturation Objavljeno v DKUM: 03.08.2017; Ogledov: 1246; Prenosov: 430
Celotno besedilo (652,05 KB) Gradivo ima več datotek! Več... |
56. Rate-dependent extensions of the parametric magneto-dynamic model with magnetic hysteresisSimon Steentjes, Martin Petrun, G. Glehn, Drago Dolinar, Kay Hameyer, 2017, izvirni znanstveni članek Opis: This paper extends the parametric magneto-dynamic model of soft magnetic steel sheets to account for the phase shift between local magnetic flux density and magnetic field strength. This phase shift originates from the damped motion of domain walls and is strongly dependent on the microstructure of the material. In this regard, two different approaches to include the rate-dependent effects are investigated: a purely phenomenological, mathematical approach and a physical-based one. Ključne besede: magnetic hysteresis, eddies, magnetic flux, viscosity, magnetic fields, magneto-dynamic models, parametric Objavljeno v DKUM: 03.08.2017; Ogledov: 1262; Prenosov: 438
Celotno besedilo (567,72 KB) Gradivo ima več datotek! Več... |
57. Prediction of standard lactation curves for primiparous Holstein cows by using corrected regression modelsJanez Jeretina, Drago Babnik, Dejan Škorjanc, 2015, izvirni znanstveni članek Opis: Prediction of the expected milk yield is important for the management of the primiparous cows (PPC) with a few or no data on their own milk productivity. We developed a system of regression equations for predicting milk yields in standard lactation. The models include the systematic effects of the calving season, the five-year rolling herd average of milk yield of PPC, the breeding values of the parents for milk production, and daily milk recordings. A total of 21,901 lactations of Holstein PPC were collected during the regular monthly milk recordings of cows in the Republic of Slovenia. By including daily milk recordings in the model, the coefficients of determination of regression models for the prediction of milk yield increase: without known recordings (M0) R 2 =0.80; with one recording (M1) R 2 =0.82; with two first consecutive recordings (M2) R 2 =0.86; and with three recordings (M3) R 2 =0.89. Deviations of milk yield up to 500 kg in a standard lactation (<1.6 kg/day) were as follows: with the model M0, they occurred in 53.4% of PPC; with M1, they occurred in 56.3% of PPC; with M2, they occurred in 64.5% of PPC; and with M3, they occurred in 70.9% of PPC. We concluded that the developed system of regression models is an appropriate method for milk yield prediction of PPC. Ključne besede: primiparous cows, milk yield, prediction, lactation curves, regression equations Objavljeno v DKUM: 24.07.2017; Ogledov: 1364; Prenosov: 507
Celotno besedilo (497,85 KB) Gradivo ima več datotek! Več... |
58. Environmental data exchanging – the need for managementDrago Vuk, 2000, drugi znanstveni članki Opis: In this paper, the author analyses the beginning of the application of measures imposed by the Slovenian Law on the Environmental Protection and the Environmental Information System. On the basis of his knowledge of the actual state, he proposes a model by means of which it would be possible to systematically assure with EDI environmental balances and environmental accounting, thus providing the basis for the implementation of an applicable environmental information system. Ključne besede: environmental protection, environmental data, electronic data interchange Objavljeno v DKUM: 17.07.2017; Ogledov: 1370; Prenosov: 142
Celotno besedilo (251,75 KB) Gradivo ima več datotek! Več... |
59. Vplivi različnih načinov vodenja sistema za uporovno točkovno varjenje na njegove izgubeJernej Černelič, 2017, doktorska disertacija Opis: V doktorski disertaciji je predstavljen srednje-frekvenčni sistem za uporovno točkovno varjenje (UTV) s katerim se v industriji varijo pločevine. Tak sistem je sestavljen iz frekvenčnega pretvornika, transformatorja, diodnega usmernika in varilnih klešč ter varjenih pločevin. S frekvenčnim pretvornikom lahko generiramo poljubne dolžine pulzov napetosti, s katero nato napajamo transformator. Posledično pa lahko uporabimo različne metode generiranja pulzov napajalne napetosti. V industriji se v ta namen najpogosteje uporablja pulzno-širinska modulacija, ki ji moramo definirati modulacijsko frekvenco, ki je pogosto konstantna. Ker lahko generiramo poljubne dolžine pulzov napajalne napetosti, pa lahko te prožimo tudi glede na potrebe procesa UTV. V disertaciji je tako predstavljen algoritem histereznega vodenja sistema za UTV, ki transformator napaja z minimalno frekvenco napajalne napetosti, ki jo sistem potrebuje, da lahko zagotovi želen bremenski tok. Pri tem pa se lahko frekvenca napajalne napetosti med obratovanjem tudi spremeni, kar ni značilno za pulzno-širinsko modulacijo. Zaradi spreminjanja frekvence napajalne napetosti v disertaciji obravnavamo število pulzov napajalne napetosti v enako dolgih varilnih ciklih. Spreminjanje frekvence pa vpliva na tako imenovane dinamične izgube sistema za UTV, ki so odvisne od frekvence napajalne napetosti. Med te izgube uvrščamo stikalne izgube frekvenčnega pretvornika, izgube povezane s kožnim pojavom v navitjih transformatorja in histerezne izgube železnega jedra transformatorja za UTV. Z zmanjšanjem frekvence se te običajno zmanjšajo, kar smo potrdili tudi v primeru sistema za UTV. Pri uporabi algoritma histereznega vodenja, ki transformator napaja z minimalno frekvenco napajalne napetosti pa naraste valovitost bremenskega toka. Ta je lahko še posebej velika pri varjenju pločevin z nizko vrednostjo nadomestne varilne upornosti. Za tak primer smo pripravili tudi algoritem vodenja, ki zmanjša valovitost bremenskega toka na polovico tako, da maksimalno dolžino pulza napajalne napetosti prepolovi. Pri tem algoritem vodenja samodejno določi dolžino pulza napajalne napetosti na podlagi prvega pulza napajalne napetosti, ki vrednost gostote magnetnega pretoka spremeni od ene točke nasičenja do druge. Oba razvita algoritma pa lahko uporabljamo tudi pri DC-DC pretvornikih, ki vsebujejo transformator. V disertaciji pa smo analizirali tudi vplive bremenskega toka, nadomestne upornosti bremena in napetosti enosmernega vodila na obremenitev sistema. Od obremenitve je namreč odvisno koliko bo lahko algoritem vodenja znižal frekvenco oziroma zmanjšal število pulzov napajalne napetosti. Na podlagi te analize lahko izberemo tak nabor varilnih parametrov, pri katerih bo izkoristek sistema za UTV največji. Vrednosti varilnih parametrov lahko namreč tudi nekoliko spremenimo, pri tem pa se kvaliteta nastalega spoja ne spremeni. Ključne besede: uporovno točkovno varjenje, regulacija, histerezna regulacija, nasičenje, algoritem vodenja, minimalna frekvenca, izgube, izkoristek, valovitost bremenskega toka, frekvenčni pretvornik Objavljeno v DKUM: 05.07.2017; Ogledov: 1901; Prenosov: 86
Celotno besedilo (9,12 MB) |
60. The role of environmental managementDrago Vuk, 1998, izvirni znanstveni članek Opis: Unlike the currently experienced practice, author offers a new approach to the environmental protection issue. To different types of management he adds the environmental component , which has attained a notable level, both as a contribution to the subject of successful development of the economy, and on the implementation level, where it can serve as one of the sources of competitive advantage. Ključne besede: management, environment, ecology Objavljeno v DKUM: 04.07.2017; Ogledov: 1544; Prenosov: 100
Celotno besedilo (478,50 KB) Gradivo ima več datotek! Več... |