bluuebunny/crossref_metadata_2025_split huggingface dataset:
Screening method for the determination of tetracyclines and fluoroquinolones in animal drinking water by liquid chromatography with diode array detector
Authors: Patyra E. , Kowalczyk E. , Grelik A. , Przeniosło-Siwczyńska M. , Kwiatek K. 
Published: July 2015

Abstract
A liquid chromatography – diode array detector (HPLC-DAD) procedure has been developed for the determination of oxytetracycline (OTC), tetracycline (TC), chlorotetracycline (CTC), doxycycline (DC), enrofloxacin (ENR), ciprofloxacin (CIP), sarafloxacin (SAR) and flumequine (FLU) residues in animal drinking water. This method was applied to animal drinking water. Solid-phase extraction (SPE) clean-up on an Oasis HLB cartridge allowed an extract suitable for liquid chromatographic analysis to be obtained. Chromatographic separation was carried out on a C18 analytical column, using gradient elution with 0.1% trifluoroacetic acid – acetonitrile – methanol at 30°C. The flow-rate was 0.7 mL/min and the eluate was analysed at 330 nm. The whole procedure was evaluated according to the requirements of the Commission Decision 2002/657/EC, determining specificity, decision limit (CCα), detection capacity (CCβ), limit of detection (LOD), limit of quantification (LOQ), precision and accuracy during validation of the method. The recoveries of TCs and FQs from spiked samples at the levels of 10, 100 and 1000 μg/L were higher than 82%. The developed method based on HPLC-DAD has been applied for the determination of four tetracyclines and four fluoroquinolones in animal drinking water samples.
Yersinia enterocolitica strains isolated from beavers (Castor fiber)
Authors: Platt-Samoraj A. , Syczyło K. , Bancerz-Kisiel A. , Szczerba-Turek A. , Giżejewska A. , Szweda W. 
Published: July 2015

AbstractPseudocloacal swabs and palatine tonsils from beavers have been examined for theYersinia enterocoliticapresence. Thirty-six samples from 24 beavers were collected and subjected to bacteriological examinations including sero- and biotypisation. Amplicons confirmed by PCR asY. enterocoliticawere sequenced. Positive samples originated from 4 out of the 24 beavers (16.7 %) and all the strains belonged to biotype 1A. The study suggested thatY. enterocoliticacould be isolated from beavers, which may therefore be treated as a reservoir, a significant factor of water contamination and a vector of theY. enterocolitica.
Comparison Of The Powers Of Energy Losses In A Variable Capacity Displacement Pump Determined Without Or With Taking Into Account The Power Of Hydraulic Oil Compression
Authors: Paszota Zygmunt 
Published: July 2015

Abstract
Powers of energy losses in a variable capacity displacement pump are compared with or without taking into account the power of hydraulic oil compression. Evaluation of power of liquid compression in the pump was made possible by the use of method, proposed by the Author, of determining the degree of liquid aeration in the pump. In the method of determining the liquid aeration in the pump and of powers of volumetric losses of liquid compression a simplified formula (qPvc × ΔpPi)/2 was used describing the field of indicated work of volumetric losses qPvc of liquid compression during one shaft revolution at indicated increase ΔpPi of pressure in the chambers. Three methods were used for comparing the sum of powers of volumetric losses ΔPPvl due to leakage and ΔPPvc of compression and also ΔPPm|ΔpPi
of mechanical losses resulting from increase ΔpPi of indicated pressure in the working chambers.
Clocking In Turbines: Remarks On Physical Nature And Geometric Requirements
Authors: Swirydczuk Jerzy 
Published: July 2015

Abstract
The article discusses two issues relating to the clocking phenomenon in turbines, which are the physical course of stator wake deformation in rotor passages and its further interaction with downstream stator blades, and turbine geometry parameters which are believed to be most favourable for clocking. In both cases, the results presented in the article have made it possible to verify and reformulate the previously accepted opinions.
Mathematical Modelling Of Elastic Deflection Of A Tubular Cross-Section
Authors: Zastempowski Marcin , Bochat Andrzej 
Published: July 2015

Abstract
Cutting a tubular element into thin rings is an operation often used in engineering processes. Total work of the cutting consists of that necessary for initial deflection of cut material and the cutting work itself. This paper presents mathematical models which describe deflection of cross-section of a single tubular element as well as a single layer of tubes under action of external forces (acting and reacting ones). The deflection concerns end part of tube hence the cutting object model has been reduced to a thin ring. Results of calculation by using the developed models are presented for selected materials of tubular elements, which are commonly used for structures of the kind; moreover, they are prepared in a form of dimensionless diagrams, that makes it possible to use them for an arbitrary material.
Distribution And Clinicopathological Features Of Breast Cancer Histological Subtypes In Latvia
Authors: Srebnijs Andrejs , Isajevs Sergejs , Eglītis Jānis , Krūmiņš Viesturs , Bērziņš Juris , Vikmanis Uldis 
Published: July 2015

Abstract
Breast cancer is a heterogenous disease. It consists of several histological subtypes that can be separated by morphology and immunohistochemistry. The aim of our study was to determine the distribution of breast cancer histological and molecular subtypes, and their relationship with clinical and pathological characteristics. A total of 561 patients who underwent breast carcinoma surgical treatment from January 2003 till December 2012 were enrolled in the study. In total, invasive ductal carcinomas not otherwise specified (IDC-NOS) plus invasive ductal carcinomas no special type (IDC-NST) were observed in 430 patients (76.65% of cases), medullar carcinoma in 14 patients (2.45%), other rare ductal carcinoma subtypes in 13 patients (2.31%), lobular carcinoma in 81 patients (14.4%) and tubulolobular carcinoma in 23 patients (4.19%). Ductal carcinoma, lobular and tubulolobular carcinoma had predominantly luminal A and B subtype, whereas medullar carcinoma had HER2-positive and triple-negative (TN) subtype. Tubular, cribriform, mucinous, papillary, and apocrine carcinomas had predominantly luminal A subtype. Significant differences between breast cancer histological subtypes and clinicopathological characteristics were observed. Our study for the first time reported the distribution and characteristics of breast cancer histological subtypes in Latvian women and relationship to clinical and tumour histopathological characteristics.
Volatile Organic Compounds Of Hybrid Rugosa Roses In Latvia
Authors: Sparinska Anta , Rostoks Nils 
Published: July 2015

Abstract
Hybrid Rugosa is the most winter hardy group of roses in the climatic conditions of the Baltic Sea region. This study aimed at identifying new qualities of Hybrid Rugosa by focusing on determination of content of volatile organic compounds of flower petals and in hydrosols produced from these. Volatiles of seven cultivars were extracted using solid phase microextraction (SPME) with subsequent separation by gas chromatography. Identification was made by comparison with mass spectral libraries and by calculating linear retention indexes and comparing them with literature data. Twenty-five volatile aroma compounds were identified in the petals and hydrosols of six Hybrid Rugosa and species. Among those, phenylethylalcohol, ß-citronellol, geraniol and nerol were predominant. Species Rosa rugosa and variety ‘Plena’ showed the highest total level of volatiles and contained 26% and 31% ß-citronellol, respectively. Varieties ‘Raita’ and ‘Sniedze’ contained up to 57% citronellol. The main volatile compounds were detected in hydrosols in the same proportions, but their concentration was higher than in petals. The varieties ‘Raita’ and ‘Violeta’, bred in Latvia, are recommendable for use as a source of hydrosol.
Influence Of Meteorological Factors On Maize Performance In Latvia
Authors: Gaile Zinta , Arhipova Irina 
Published: July 2015

Abstract
Latvia is recognised as a marginal area for growing of maize (Zea mays L.), as years of high yielding can be broken by years with failures. The aim of this paper is to describe maize yield, dry matter (DM) content in fresh yield, and some other quality indicators in silage maize field trials at the Research and Study Farm “Vecauce” of the Latvia University of Agriculture (56° N), in relation to temperature and moisture conditions. The study was carried out for 15 years (1999–2013). In total, 217 maize hybrids, belonging mainly to the early-maturity group (FAO up to 220), were investigated. Meteorological conditions considerably differed, and, according to heat conditions, only 10 years were suitable for maize production. The mean fresh maize yield varied from 43.01 t ha−1 to 63.39 t ha−1 during the study period, which 1.8 to 2.9 times higher than the average statistical yield in Latvian farms in the respective years. The DM yield ranged between 8.77 t ha−1 (in 2004) and 20.05 t ha−1 (in 2013) and was significantly correlated with temperature in May and June. The study suggested that cold tolerance of hybrids during early development stages should be investigated in future. Fresh and DM yield of maize were significantly (p < 0.001) affected by hybrid and year as factors, as well as by their interaction. DM content in fresh yield was correlated with active temperature sum. Low precipitation was a yield-limiting factor during some years. Ear proportion in yield decreased when moisture stress occurred before and during silking.
Antioxidant defence-related genetic variants are not associated with higher risk of secondary thyroid cancer after treatment of malignancy in childhood or adolescence
Authors: Vodusek Ana Lina , Goricar Katja , Gazic Barbara , Dolzan Vita , Jazbec Janez 
Published: July 2015

Abstract

Background
Thyroid cancer is one of the most common secondary cancers after treatment of malignancy in childhood or adolescence. Thyroid gland is very sensitive to the carcinogenic effect of ionizing radiation, especially in children. Imbalance between pro- and anti-oxidant factors may play a role in thyroid carcinogenesis. Our study aimed to assess the relationship between genetic variability of antioxidant defence-related genes and the risk of secondary thyroid cancer after treatment of malignancy in childhood or adolescence.

Patients and methods
In a retrospective study, we compared patients with childhood or adolescence primary malignancy between 1960 and 2006 that developed a secondary thyroid cancer (cases) with patients (controls), with the same primary malignancy but did not develop any secondary cancer. They were matched for age, gender, primary diagnosis and treatment (especially radiotherapy) of primary malignancy. They were all genotyped for SOD2 p.Ala16Val, CAT c.-262C>T, GPX1 p.Pro200Leu, GSTP1 p.Ile105Val, GSTP1 p.Ala114Val and GSTM1 and GSTT1 deletions. The influence of polymorphisms on occurrence of secondary cancer was examined by McNemar test and Cox proportional hazards model.

Results
Between 1960 and 2006 a total of 2641 patients were diagnosed with primary malignancy before the age of 21 years in Slovenia. Among them 155 developed a secondary cancer, 28 of which were secondary thyroid cancers. No significant differences in the genotype frequency distribution were observed between cases and controls. Additionally we observed no significant influence of investigated polymorphisms on time to the development of secondary thyroid cancer.

Conclusions
We observed no association of polymorphisms in antioxidant genes with the risk for secondary thyroid cancer after treatment of malignancy in childhood or adolescence. However, thyroid cancer is one of the most common secondary cancers in patients treated for malignancy in childhood or adolescence and the lifelong follow up of these patients is of utmost importance.
Lactic acid and hydrogen from glycerol via acceptorless dehydrogenation using homogeneous catalysts
Authors: Bottari Giovanni , Barta Katalin 
Published: July 2015

AbstractAcceptorless dehydrogenation of alcohols has emerged as a powerful methodology for the valorization of biomass derived platform chemicals and building blocks. In this review we provide a short overview of the advantages and possible product outcomes of this method. The main focus will be devoted to the conversion of glycerol, which is the major waste product of biodiesel production, to lactic acid. While extensive research addresses the development of heterogeneous catalysts, recently new and highly active iridium and ruthenium complexes have also been reported. These novel homogeneous catalysts are even more active than the already reported heterogeneous systems and enable the direct conversion of glycerol into lactic acid and molecular hydrogen. While the product hydrogen might be used either as fuel or as reducing agent for other processes, lactic acid is a platform chemical widely employed by the polymer, pharmaceutical and food industries. The used catalytic methodology is atom-economic, waste-free and is uniquely suited for the efficient conversion of renewable resources.
The Cartographic Method of Research in Exploring the Real Estate Market - A Case of Using Maps for the Introductory Analyses of the Lublin Suburban Commune of Konopnica
Authors: Nieścioruk Kamil 
Published: July 2015

Abstract
The paper deals with the introductory analysis of the real estate market of a suburban commune located near a big (voivodeship capital) city. The analysis is based mainly of the cartographic method of research. Besides data mining and preparation, maps play an important role here, presenting values acquired directly from the register of notarial deeds of estate sales and purchases, as well as values resulting from statistic computation, for example mean values of area or price, absolute numbers of transactions or real estate type. The spatial factor is also taken into consideration when it comes to more complex or specific analyses. The influence of distance understood as a metric and time factor, as well as regression analysis results are also visualized on maps. Such presentation is a good step towards advanced analyses providing maps are prepared according to the rules of cartography. The paper stresses that a map can be a great tool in aiding every stage of research, but may also cause misinterpretations and false conclusions when at least basic rules are not complied with.
The influence of curing time on the shear strength of fluidized fly ash
Authors: Gruchot Andrzej 
Published: July 2015

Abstract
The paper presents results of research on the influence of compaction and air and water curing on angle of internal friction and cohesion of fluidized fly ash from “Połaniec” Power Plant. It was stated that the increase in compaction resulted in an insignificant increase of the angle of internal friction and a quite significant increase of cohesion. While the type and time of curing had a great influence on the angle of internal friction and cohesion. The highest values of angle of internal friction were obtained in the air curing, and the lowest in the water curing whereas in case of cohesion there was an inverse relation. The rise of curing time resulted in largely increased cohesion and small changes of angle of internal friction.
Effect Of Coir Fibres On The Compaction And Unconfined Compressive Strength Of Bentonite-Lime-Gypsum Mixture
Authors: Tilak B. Vidya , Dutta Rakesh Kumar , Mohanty Bijayananda 
Published: July 2015

Abstract
This paper presents the effect of coir fibres on the compaction and unconfined compressive strength of a bentonite-lime-gypsum mixture. The coir fiber content varied from 0.5 to 2 %. The results indicated that the dry unit weight and the optimum moisture content of a bentonite – lime mix increased with the addition of gypsum. The unconfined compressive strength of the bentonite increased with the increase in the lime content up to 8 %. Beyond 8 %, the unconfined compressive strength decreased. The dry unit weight of the reference mix decreased, and the optimum moisture content increased with the addition of coir fibre. The unconfined compressive strength of the bentonite + 8 % lime mix increased up to 4 % with the gypsum. Beyond 4 %, the unconfined compressive strength decreased. The unconfined compressive strength of the reference mix increased with the addition of coir fibre up to a fibre content of 1.5 %. The unconfined compressive strength of the reference mix-coir fibre composite was less in comparison to the reference mix. The unconfined compressive strength of the bentonite increased with the addition of lime and gypsum and with the increase in the curing period. The improvement in the post-peak region was better for the reference mix with reinforced coir fibres as compared to the unreinforced reference mix. The improved post-peak behaviour of the bentonite-lime-gypsum-coir fibre mixture could boost the construction of temporary roads on such problematic soils. Further, its use will also provide an environmental motivation for providing a means of consuming large quantities of coir fibres.
Long-Term Weather Data Measurements From A Danish Climate Station And The Weather’s Influence On The Thermal Performance Of Solar Collectors
Authors: Skalík Lukáš 
Published: July 2015

Abstract
A weather data evaluation from a climate station in Lyngby, Denmark, was carried out. Twenty years of measurements show that the increase in global radiation was almost 3.5 kWh/m2 per year, corresponding to a growth of the yearly global radiation of 7 % for the last 20 years. The global radiation variation between the least sunny year to the sunniest year was 20%. The increase in diffuse radiation was 1.9 kWh/m2 per year, corresponding to 20 years’ growth of up to 7 %. The annual diffuse radiation of nearly 19 % varied from the least cloudy year to the cloudiest year. A small increase was measured for the ambient air temperature. The measurements showed a yearly increase of 0.04 K per year. The average yearly ambient air temperature variation from the coldest to the warmest year was 3.1 K. According to the seasonal growth of the parameters measured, the ambient air temperature and diffuse radiation increased the most in the summer period, while the global radiation significantly increased in the spring months. The calculations of the solar collector's thermal performance in Lyngby showed that the energy output was mostly dependent on beam radiation. The ambient air temperature did not have a high influence on the thermal performance of the solar collectors compared to the influence of the total solar radiation.
Moore-Penrose inverses of Gram matrices
leaving a cone invariant in an indefinite inner
product space
Authors: Appi Reddy K. , Kurmayya T. 
Published: July 2015

Abstract
In this paper we characterize Moore-Penrose inverses of Gram matrices leaving a cone invariant in
an indefinite inner product space using the indefinite matrix multiplication. This characterization includes
the acuteness (or obtuseness) of certain closed convex cones.
Stimulating Creativity Methods And Innovative Performance In European Countries
Authors: Şipoş Gabriela Lucia , Ionescu Alin 
Published: July 2015

Abstract
A widely debated topic during the last decades focuses on the companies’ opportunities to acquire corporate competitiveness due to research, innovation and development. Thus, in the context of increased competition and current global challenges, fostering creativity and innovation is a way to boost economic growth and welfare of European countries. New and original ideas, skills, competencies and innovations they all could enable to achieve competitive advantages. Creative ideas and innovative solutions are crucial for the European countries in order to overcome the current economic crisis.
This paper aims to study the impact of stimulating creativity methods used by companies on innovative performance of the country. The study is based on identifying correlations between using stimulating creativity methods – such as brainstorming sessions, financial incentives for employees to develop new ideas, job rotation of staff, multidisciplinary or cross-functional work teams, non-financial incentives for employees and training employees on how to develop new ideas or creativity – and, by the other hand, innovative performance of European countries, synthetically expressed by Summary Innovation Index. It also quantifies and scales the intensity of influence using each stimulating creativity method.
The results of this study can be a real help for companies to identify the most appropriate stimulating creativity methods in order to increase the innovative performance. Thereby, the main output of the study consists in the fact that using the most effective methods of stimulating creativity the companies will be able to increase their innovative potential and they could obtain long-term competitive advantages.
A Comparison of Hybrid Approaches for Turbofan Engine Gas Path Fault Diagnosis
Authors: Lu Feng , Wang Yafan , Huang Jinquan , Wang Qihang 
Published: July 2015

AbstractA hybrid diagnostic method utilizing Extended Kalman Filter (EKF) and Adaptive Genetic Algorithm (AGA) is presented for performance degradation estimation and sensor anomaly detection of turbofan engine. The EKF is used to estimate engine component performance degradation for gas path fault diagnosis. The AGA is introduced in the integrated architecture and applied for sensor bias detection. The contributions of this work are the comparisons of Kalman Filters (KF)-AGA algorithms and Neural Networks (NN)-AGA algorithms with a unified framework for gas path fault diagnosis. The NN needs to be trained off-line with a large number of prior fault mode data. When new fault mode occurs, estimation accuracy by the NN evidently decreases. However, the application of the Linearized Kalman Filter (LKF) and EKF will not be restricted in such case. The crossover factor and the mutation factor are adapted to the fitness function at each generation in the AGA, and it consumes less time to search for the optimal sensor bias value compared to the Genetic Algorithm (GA). In a word, we conclude that the hybrid EKF-AGA algorithm is the best choice for gas path fault diagnosis of turbofan engine among the algorithms discussed.
Fruit Flies Of The Genus Campiglossa (Diptera, Tephritidae) In Iran, With The Key To Species
Authors: Namin S. Mohamadzade , Nozari J. 
Published: July 2015

Abstract
Seven species of Campiglossa occurring in Iran are reviewed, Campiglossa grandinata (Rondani) is recorded for the first time from Iran (Fars Province) and Cichorium intybus L. (Asteraceae) recorded as a new host plant for Campiglossa producta. A key to species is provided.
Rediscovery Of The Northern Mole Vole, Ellobius Talpinus (Rodentia, Cricetidae), At The Western Bank Of The Dnipro River, Ukraine
Authors: Rusin M. , Rashevska H. , Mylobog Y. , Stryhunov V. 
Published: July 2015

Abstract
Ellobius talpinus was supposed to become extinct from the westernbank of the river Dnipro. Aft er 50 years the species was found again in Dnipropetrovsk and Kherson Region. The brief description of the current distribution of the northern mole vole to the west of the Dnipro is given. Altogether 11 localities were found. The rediscovered populations may be treated as endangered in the region.