V prispevku je predstavljen keramični predmet ovalne oblike iz hiše z območja zgodnjeeneolitske naselbine Zgornje Radvanje (Podravje). Hiša pripada delu naselbine, ki je bil glede na datiranje z ...radioaktivnim ogljikom (z metodo 14C AMS, akceleratorsko masno spektroskopijo) najverjetneje naseljen največ 146 let (s 95,4-odstotno stopnjo zaupanja) v času okoli 4300 pr. n. št. Na podlagi oblike keramičnega predmeta, sledov ožganosti in zoglenelih organskih ostankov na površini domnevamo, da so ga uporabljali kot svetilko. Hipotezo smo testirali z infrardečo spektroskopijo (ATR IR), masno spektrometrijo (MS) in eksperimentom, izvedenim s pomočjo replike. Rezultati rentgenske fluorescenčne spektrometrije (XRF) pa nakazujejo, da je bil predmet najverjetneje narejen iz lokalne gline. Na istem najdišču je bil najden še en odlomek verjetno enakega predmeta. Delno primerljive najdbe so znane z nekaterih neolitskih, eneolitskih in bronastodobnih najdišč v osrednji in jugovzhodni Evropi.
V literaturi so na voljo številne teoretične in empirične raziskave vrednotenja učinkovitosti stavb na nepremičninskem trgu. Nekatere od njih preučujejo spremembe v cenah nepremičnin po njihovi ...obnovi, le malo pa se jih ukvarja z določanjem cen stavb na podlagi njihove varnosti. V članku je predstavljena raziskava, ki preučuje, ali stanovanja v varnejših stavbah v Hongkongu dosegajo višje tržne vrednosti. Za tovrstno raziskavo je Hongkong kar dober laboratorij, saj je v tako gosto poseljenem okolju, v katerem prevladujejo visoke stavbe, propadanje in nevzdrževanje stavb, ki vodi v zrušitev, lahko zelo nevarno. V raziskavi je varnost stavb merjena s ponderiranim številom nedovoljenih gradbenih del (NGD) na zunanjih zidovih stavb. NGD so dela, izvedena brez vnaprejšnje odobritve in soglasja vlade. Za ocenjevanje tržne vrednosti varnosti stavb je oblikovan model hedonskih cen. Za potrebe modela so bili poleg podatkov o nepremičninskih transakcijah pridobljeni tudi podatki o številu nedovoljenih dodatnih elementov (to je NGD na pročelju stavb) na vsaki preučevani stavbi. Na podlagi rezultatov analize je preverjenih več hipotez, ki temeljijo na teorijah samozaščite in samozavarovanja.
This paper presents a parametric modeling method for predesign cost estimation of urban railway systems. Data of 13 light rail and metro projects located in Turkey were compiled for quantification of ...the impacts of parameters on the project costs. Parametric models have been developed using regression analysis and neural networks techniques. Ten linear regression models were used for determination of the parameters significantly impacting cost of urban railway projects. Two neural networks were considered as an alternative to regression models, particularly for the identification of the non-linear relations. Predictive behaviour and performance of the models were compared to determine a model that presents adequate relations and has a reasonable accuracy. The proposed method provides a powerful approach for determination of a satisfactory parametric cost model during early project stages by incorporating a coordinated use of regression analysis and neural network techniques.
Non-linear analysis of an integral bridge Noorzaei, Jamaloddin; Abdulrazeg, Aeid. A.; Jaafar, Mohamed Saleh ...
Journal of civil engineering and management,
20/9/1/, Letnik:
16, Številka:
3
Journal Article
Recenzirano
Odprti dostop
This study describes the implementation of a 2-D finite element model of an integral abutment bridge (IAB) system which explicitly incorporates the nonlinear soil response. The superstructure members ...have been represented by means of three-node isoparametric beam elements with three degrees of freedom per node. The soil mass is idealized by eight node isoperimetric quadrilateral element at near field and five node isoparametric infinite element to simulate the far field behavior of the soil media. The non-linearity of the soil mass has been represented by using the Duncan and Chang hyperbolic model. The applicability of this model was demonstrated by analyzing a single span IAB. This study has shown that the soil nonlinearity has significant effect on the response of the structure, where the displacement that have been obtained on basis of nonlinear analysis is 1.5-2.0 times higher than that obtained from linear analysis. The stress magnitudes in the nonlinear analysis are also higher where in some point the difference reached almost 3 times.
Engineering consulting firms, like other knowledge-based enterprises, take intellectual capital as their most important asset embedded in the organisation. This research aims to analyse the ...correlation between intellectual capital and business performance. The questionnaire was sent to all Taiwan's engineering consulting firms, and 101 copies were collected. It was found that, among these engineering consulting firms, the structural capital and relational capital show better performance, while human capital has poorer performance. This is especially true for staff education and training. This indicates that there is still room for improving human resource management by engineering consulting firms. It is observed by path analysis that, among the three dimensions of engineering consulting firms' intellectual capital, the human capital has a great influence on structural capital and relational capital. However, only relational capital has a direct influence on business performance. Human capital has an influence upon the business performance via the relational capital.
Pesticides are one of the most potent environmental contaminants, which accumulate in biotic and abiotic components of ecosystems. Acetamiprid (Acm), a neonicotinoid insecticide, and Propineb (Pro), ...a dithiocarbamate fungicide, are widely used to control sucking insects and fungal infections on crops, respectively. The present study was undertaken to investigate the genotoxic effects of these compounds, individually and in mixtures, in mouse germ cells by using the sperm morphology assay. Mice were injected intraperitoneally with 0.625, 1.25, and 2.50 μg mL
of Acm, 12.5, 25, and 50 μg mL
of Pro, and their mixture at the same concentrations over 24 and 48 h. Acm did not significantly increase the percentage of abnormal sperm at any concentration. The frequency of abnormal sperm significantly increased after 24 and 48 h of exposure to 50 μg mL
of Pro. The mixtures of 2.50 μg mL
of Acm and 50 μg mL
of Pro induced sperm abnormalities antagonistically both after 24 and 48 h of exposure. Results suggest that Acm was non-genotoxic for mouse germ cells, while Pro may have been a germ cell mutagen due to the observed increase in the frequency of sperm abnormalities. However, to gain better insight into the mutagenicity and DNA damaging potential of both of these pesticides, further studies at molecular level should be done.
Pesticidi su snažni zagađivači okoliša, a akumuliraju se i u biotičkim i abiotičkim sastavnicama ekosustava. Acetamiprid (Acm), insekticid iz skupine neonikotinoida, i propineb (Pro), fungicid iz skupine ditiokarbamata, imaju široku primjenu u kontroli sisajućih insekata, odnosno gljivičnih infekcija, na usjevima. Ovim se radom istražuju genotoksični učinci spomenutih spojeva, pojedinačno i u mješavini, na mišje spolne stanice testom morfološke analize spermija. Miševima je intraperitonealno ubrizgano 0,625, 1,25 i 2,50 μg mL-1 Acm-a, 12,5, 25,00 i 50,00 μg mL-1 Pro-a, te njihova mješavina pri istim koncentracijama tijekom 24 i 48 sati. Acm nije povećao postotak abnormalnih spermija ni pri jednoj koncentraciji. Učestalost abnormalnih spermija značajno je porasla nakon 24 i 48 sati izloženosti 50 μg mL-1 Pro-a. Mješavina od 2.50 μg mL-1 Acm-a i 50,00 μg mL-1 Pro-a uzrokovala je abnormalnosti spermija antagonistički i nakon 24 i nakon 48 sati izloženosti. Naši rezultati pokazuju kako Acm nije bio genotoksičan za mišje spolne stanice, a primijećeni porast učestalosti abnormalnosti spermija nakon izlaganja Pro upućuje na to da bi on mogao biti mutagen. Međutim, kako bi se stekao bolji uvid u mutagenost i potencijal obaju pesticida za oštećenje DNA, nužna su daljnja istraživanja na molekularnoj razini.
This article presents the possibilities of using mining techniques in building Decision Support Systems. One of the biggest problems is the issue of gaining data and knowledge, their mutual ...representation and reciprocal usage. Data and knowledge make up the resources of the system and are its key link. It has been estimated that 70% to 80% of the sources available for general use are text documents. The text mining technique is defined as a process aiming to extract previously unknown information from text resources (e.g. technological cards). The fundamental feature of text mining is the ability to converse text documents in formal form, which opens up great possibilities of conducting further analysis. This article presents chosen IT tools using text mining technique, along with the elements of the text mining analysis. The main objectives are the simplification of the process of knowledge acquisition, its automation and shortening as well as the creation of ready-made models containing knowledge. Previous tests with knowledge acquisition (surveys, questionnaires) were time-consuming and exacting for experts. PUBLICATION ABSTRACT
Practical tasks related to property management and disposal in energy companies can be solved only if the actual property value of these companies is known. Traditional practical property valuation ...methods are based on the analysis of incurred property development costs or financial indicators of activities and are inadequate to account for the influence of environment factors on corporate activities and, in turn, on the value of companies. An analysis model for environment factors affecting energy companies was developed to improve objectiveness of valuation; through analysis of the model's components it is possible to analyse external macro, meso and microenviron‐ment of a particular company and to assess efficiency of such environment, as well as the impact of separate factors on value. A criteria system developed using the Analysis Model for Environment Factors and the Decision Support System for Measurement of Effect of Environment Factors on Value of Energy Companies, which was developed by the authors, were used to solve a practical task, which helped to evaluate the effectiveness of the Model of Environment Factors. The practical task included measurement of the utility degree and market value of the selected electricity companies and assessment of the impact of the criteria, which affect the environment, on the value of the selected energy companies. Santrauka Energetikos įmonių turto valdymo, disponavimo turtu praktiniams uždaviniams spręsti reikalinga tikroji šių įmonių turto vertė. Tradiciniai praktikoje taikomi turto vertinimo metodai pagrįsti turto sukūrimo sąnaudų ar veiklos finansinių rodiklių analize, jie neįvertina daugelio vertę veikiančių aplinkos veiksnių įtakos. Siekiant padidinti vertės nustatymo objektyvumą, pasiūlytas taikyti energetikos įmonių aplinkos veiksnių tyrimo modelis, kurio elementų analizė leidžia įvairiais aspektais pažvelgti į šių įmonių turto vertę ir įvertinti vertės kitimo priežastis. Sukurtas modelis leidžia analizuoti įmonės aplinką, vertinti jos efektyvumą, aplinką ir suinteresuotas grupes veikiančią išorinę makro-, mezo- ir mikroaplinką kaip visumą. Naudojantis rodiklių, apibūdinančių analizuojamo sektoriaus aplinką, sistema, pasiūlyta infrastruktūros įmonėms vertinti, taikyti daugiakriterine analize paremtus metodus. Siekiant nustatyti aplinkos veiksnių tyrimo modelio veiksmingumą, išspręstas praktinis uždavinys – taikant modelį ir remiantis daugiakriterinės analizės metodais nustatytas pasirinktų elektros energetikos įmonių naudingumo laipsnis ir rinkos vertė.
Straipsnyje, remiantis 2008 m. nusikalstamu veiku, užregistruotu Vidaus reikalu informacines sistemos Nusikalstamu veiku žinybiniame registre, statistiniais duomenimis, atliktas autokoreliacijos ...tyrimas: šalies mastu apskaičiuota Morano I statistikos indekso reikšme bei atvirkštinio svertinio atstumo ir Z iverčio vertes savivaldybiu lygmeniu. Aptartas galimas savivaldybiu teigiamu (atvirkštinio svertinio atstumo) bei neigiamu (Z iverčio) ekstremumo reikšmiu priežastingumas. Atlikti vagysčiu (nusikaltimu) vietos koeficiento Lietuvos savivaldybese skaičiavimai, akcentuojant gautas didžiausias išryškejusiu teritoriniu skirtumu reikšmes ir jas lemiančias priežastis.
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