bluuebunny/crossref_metadata_2025_split huggingface dataset:
Perbandingan Metode Spektrofotometri UV Dan HPLC pada Penetapan Kadar Kafein dalam Kopi
Authors: Susanti Hari , Araaf Nisa Putri Mujaadillah , Kusbandari Aprilia 
Published: January 2020

Kafein merupakan salah satu alkaloid yang terkandung dalam kopi. Konsumsi kafein dalam jumlah besar bisa berdampak pada kesehatan manusia. Kebiasaan orang-orang jamun dulu minum kopi tradisional, maupun orang jaman sekarang minum kopi dengan berbagai varian tentu akan berpengaruh pada kondisi kesehatan. Sehingga perlu diketahui kandungan kafein dalam kopi. Peneliti terdahulu telah melakukan penetapan kadar kopi dengan metode HPLC maupun Spektrofotometri. Namun belum ada yang membandingkan kedua metode. Penelitian ini bertujuan untuk membandingkan metode spektrofotometri UV dan HPLC dalam penetapan kadar kafein dalam kopi. Sampel yang digunakan adalah sediaan kopi hijau dan kopi hitam. Perbandingan metode dilakukan dengan membandingkan data hasil validasi metode antara spektrofotometri UV dan HPLC. Metode spektrofotometri dilakukan dengan pelarut air, absorbansi kafein dibaca pada panjang gelombang 272 nm. Metode HPLC dilakukan dengan fase diam C18, fase gerak matanol-air (69:40 v/v) flow rate 1 ml/menit dan detector UV 272 nm. Hasil validasi metode analisis kafein secara spektrofotometri adalah sebagai berikut : linearitas (R= 0,9965), presisi (RSD= 0,899%), akurasi (recovery = 98,46%) LOD= 1,12 ug/ml, LOQ=3,75 ug/ml. Hasil validasi metode HPLC adalah: linearitas (R= 0,998), Presisi (RSD= 2,49%), akurasi (Recovery= 84%), LOD=0,565 ug/ml, LOQ= 1,88 ug/ml. Kadar kafein dalam sampel kopi hijau sediaan dan kopi hitam sediaan, secara Spektrofotometri UV bertrurut-turut (dalam %) adalah : (0,155± 0,053) dan (0,696 ± 0,014). Kadar kafein dalam kopi hijau sediaan, kopi hitam sediaan, secara HPLC berturut-turut (dalam %) adalah ; 0,121 dan 0,421. Metode spektrofotometri UV direkomendasikan sebagai metode pilihan pada penetapan kadar kafein dalam sampel kopi.
The effect of herbicides and their mixtures and weather conditions on the content of vitamin C in edible potato tubers
Authors: GUGAŁA MAREK , ZARZECKA KRYSTYNA , SIKORSKA ANNA 
Published: January 2020

The aim of the research was to determine the effect of the herbicides and their mixtures and weather conditions on the content of vitamin C in tubers of three edible potato cultivars. A field experiment was conducted from 2008 to 2010 at the Zawady Experimental Farm (52°03'N and 22°33'E) belonging to Siedlce University of Natural Sciences and Humanities. The experiment was established as a two-factorial split-plot arrangement with three replicates. The experimental factors included: I – three edible potato cultivars: ‘Cekin’, ‘Satina’ and ‘Tajfun’; II – five weed control methods: 1. mechanical weed control only – control, 2. mechanical and chemical control – mechanical control + Command 480 EC (clomazone 480 g·dm–3), 3. mechanical and chemical control – mechanical control + Command 480 EC (clomazone 480 g·dm–3) + Dispersion Afalon 450 SC (linuron 450 g·dm–3), 4. mechanical and chemical control – mechanical control + Stomp 400 SC (pendimethalin 400 g·dm–3), 5. mechanical and chemical control – mechanical control + Stomp 400 SC (pendimethalin 400 g·dm–3) + Dispersion Afalon 450 SC (linuron 450 g·dm–3). Research results were statistically analysed using analysis of variance. The research demonstrated that vitamin C content in potato tubers ranged from 207.5 to 215.8 mg·kg–1 fresh matter and was significantly affected by cultivars. The examined herbicides and their mixtures significantly affected the potato tuber content of vitamin C, which increased from 3.3 to 10.4 mg·kg–1, on average, compared with control where only mechanical control had been used. The effect of care methods on the content of vitamin C was dependent on the genetic factor. In the ‘Santina’ and ‘Tajfun’ cultivars, the highest content was obtained due to the care with herbicides Stomp 400 SC and Dispersion Afalon 450 SC, while in the ‘Cekin’ cultivar, it was the same on all objects regardless of the care used. Moreover, meteorological conditions significantly influenced the vitamin C accumulation. The lowest vitamin C content was recorded in the final study year, when the highest annual rainfall sum was accompanied by the air temperature averaging 15.6°C.
Floristic diversity and use value of phytocoenoses in a section of the Wieprz river valley in Roztocze National Park for feeding the konik polski horse
Authors: WYŁUPEK TERESA GRAŻYNA , KLIKOCKA HANNA , KULIK MARIUSZ , LIPIŃSKA HALINA , GAWRYLUK ADAM 
Published: January 2020

The paper describes the floristic diversity and specifies its use value in terms of feeding preferences of konik polski horses and their consumption of permanent grassland in a section of the Wieprz river valley in Roztocze National Park. The flora assessment was conducted by analyzing 79 phytosociological relevés using the Braun-Blanquet method. The results of phytosociological surveys made it possible to distinguish 7 complexes in the Phragmitetea class, 5 complexes and 1 plant community in the Molinio-Arrhenatheretea class, and 1 complex in the Nardo-Callunetea class. Natural values of the examined associations were described based on the total and average number of species in a phytosociological relevé, the Shannon-Wiener index, and the phytosociological structure of plant communities. The use value of dry weight of the analyzed meadows and pastures was estimated by means of the use value number (UVN) and taking into account the and yield size. The phytocoenoses identified in the meadows in the section of the Wieprz river valley under study exhibited high natural values (H’ = 3.20–4.62). The dry weight yields of the examined communities varied (from 1.32 to 5.37 t ha–1), but their sward usually had poor and very poor use value (UVN = from –0.55 to 5.8). Furthermore, it should be noted that the sward of wet meadows is readily consumed by the grazing animals, which contributes to the improvement of the natural and use value of meadows.
Quantum-chemical studies of rutile nanoparticles toxicity I. Defect-free rod-like model clusters
Authors: Breza Martin , Šimon Peter 
Published: January 2020

Abstract
Using the semiempirical PM6 method, structures of a rod-like [Ti40O124H81]7– model cluster and of [Ti40O124H81Cu]5– with Cu2+ coordinated at various sites were optimized in order to assess the toxicity of rutile nanoparticles. If the relative toxicity of individual Ti centers in rod-like rutile nanoparticles can be evaluated by the electron density transfer to a Cu2+ probe, its maximal values can be ascribed to the pentacoordinated corner and hexacoordinated edge Ti centers with three Ti—OH bonds. However, these centers exhibit the least negative interaction energies which can be compensated by the significantly better accessibility of the corner Ti center compared with that of the remaining ones. Ti centers with the most negative interaction energy parameters exhibit the lowest extent of electron density transfer to a Cu2+ probe. Rutile nanoparticles destruction starts at pentacoordinated Ti face centers.
Growth ofStaphylococcus aureus2064 described by predictive microbiology: From primary to secondary models
Authors: Medveďová Alžbeta , Havlíková Adriana , Valík Ľubomír 
Published: January 2020

AbstractThe growth ofStaphylococcus aureus2064 isolate in model nutrient broth was studied as affected by temperature and water activity using principles and models of predictive microbiology. Specific rates resulting from growth curves fitted by the Baranyi model were modelled by the secondary Ratkowsky model for suboptimal temperature range (RTKsub) as well as the Ratkowsky extended model (RTKext) and cardinal model (CM) in the whole temperature range. With the biological background of the RTKext model, cardinal values of temperatureTmin= 6.06 °C andTmax= 47.9 °C and water activityaw min= 0.859 were calculated and validated with cardinal values estimated by CM (Tmin= 7.72 °C,Tmax= 46.73 °C,aw min= 0.808). CM also provided other cardinal values,Topt= 40.63 °C,awopt= 0.994, as well as optimal specific growth rate of 1.97 h–1(atToptandawopt). To evaluate the goodness of fit of all models, mathematical and graphical validation was performed and the statistical indices proved appropriateness of all the secondary models used.
DFT and ab initio calculations of ionization potentials, proton affinities and bond dissociation enthalpies of aromatic compounds
Authors: Cagardová Denisa , Michalík Martin , Klein Erik , Lukeš Vladimír , Marković Zoran 
Published: January 2020

Abstract
Theoretical study of phenol, thiophenol, benzeneselenol, aniline and their para-amino and paranitro derivatives is presented. Neutral molecules, their deprotonated forms, neutral radicals, and radical cations were studied using three Density Functional Theory (DFT) functionals as well as combined DFT and ab initio G4 method in order to calculate the N—H, O—H, S—H, and Se—H bond dissociation enthalpies (BDE), proton affinities of corresponding anions (PA) and ionization potentials (IP) of studied compounds. These quantities represent fundamental reaction enthalpies related to the radical scavenging action of primary antioxidants. Calculated values were compared with available experimental data to assess applicability of the computational approaches employed. M06-2X/6-311++G(d,p) and G4 methods showed the best agreement with the available experimental gas-phase reaction enthalpies.
Tannins, novel inhibitors of the volume regulation and the volume-sensitive anion channel
Authors: Tsiferova N.A. , Khamidova O. J. , Amonov A. U. , Rakhimova M. B. , Rustamova S. I. , Kurbannazaova R. Sh. , Merzlyak P. G. , Abdulladjanova N. G. , Sabirov R. Z. 
Published: January 2020

Abstract
The volume-sensitive outwardly rectifying anion channel (VSOR) is a key component of volume regulation system critical for cell survival in non-isosmotic conditions. The aim of the present study was to test the effects of four tannin extracts with defined compositions on cell volume regulation and VSOR. Preparation I (98% of hydrolysable tannins isolated from leaves of sumac Rhus typhina L.) and Preparation II (100% of hydrolysable tannins isolated from leaves of broadleaf plantain Plantago major L) completely and irreversibly abolished swelling-activated VSOR currents in HCT116 cells. Both preparations profoundly suppressed the volume regulation in thymocytes with half-maximal effects of 40.9 μg/ml and 12.3 μg/ml, respectively. The inhibition was more efficient at lower concentrations but reverted at higher doses due to possible non-specific membrane-permeabilizing activity. Preparations III and IV (54,7% and 54.3% of hydrolysable tannins isolated, respectively, from roots and aboveground parts of Fergana spurge Euphorbia ferganensis B.Fedtch) inhibited VSOR activity in a partially reversible manner and suppressed the volume regulation with substantially higher half-maximal doses of 270 and 278 μg/ml, respectively, with no secondary reversion at higher doses. Hydrolysable tannins represent a novel class of VSOR channel inhibitors with the capacity to suppress the cell volume regulation machinery.
Evolutionary solving of the debts’ clearing problem
Authors: Păatcaş Csaba , Bartha Attila 
Published: January 2020

Abstract
The debts’ clearing problem is about clearing all the debts in a group of n entities (banks, companies etc.) using a minimal number of money transaction operations. The problem is known to be NP-hard in the strong sense. As for many intractable problems, techniques from the field of artificial intelligence are useful in finding solutions close to optimum for large inputs. An evolutionary algorithm for solving the debts’ clearing problem is proposed.
The Language of Street Signs in Dualist Transylvania and the Banat
Authors: Berecz Ágoston 
Published: January 2020

Abstract
Twice in the history of late Habsburg Austria, local conflicts over the languages used on street signs spilled out into all-out political crises on the imperial level – first in 1892, when the Prague municipality’s decision to replace the city’s bilingual signs with Czech-only ones and to rename a multitude of streets after Czech national heroes sparked violent demonstrations across the Empire’s German-speaking cities. Then in 1911, a plan to display street names in three scripts in Sarajevo led to a tug of war between the Bosnian parliament and the imperial authorities. If there were no such high-profile symbolic fights over urban spaces in the contemporary Kingdom of Hungary, that was not because Magyarizing policies had successfully purged the linguistic cityscape, as the earlier literature on the era may lead one to believe. The picture that unfolds from the sources employed here is indeed diverse. But unlike in the western half of the Empire, city fathers were more interested in papering over rather than playing up national conflicts. The story of street signs in Dualist Transylvania and the Banat is one of resistance and consensus, of complex power relations and of subtle ways to signal them.
A Corpus of Hebrew-Language Gratulatory Poems by 17th-Century Hungarian Peregrine Students: Introducing the Hebrew Carmina Gratulatoria (HCG) Corpus and Its Research Potentials
Authors: Götz Andrea 
Published: January 2020

Abstract
This paper discusses a corpus of so-called carmina gratulatoria, or gratulatory poems, composed by 17th-century Hungarian peregrines in Hebrew. The paper argues that this understudied type of text offers a valuable resource for a wide range of fields due to the sociohistorical, cultural, and linguistic information the texts contain.
The Status of Interdisciplinary Metaphor in Specialized Lexis
Authors: Butiurca Doina 
Published: January 2020

Abstract
The assertion we start from in our study is that in specialized languages metaphor is a figure of reason rather than a figure of speech. The general objective of the study is researching the interdisciplinary status of specialized metaphor – terminological and conceptual – by making reference to the hard core of terminology. Derived objectives: comparative research of the degree of scientificity of interdisciplinary metaphor, at the hard core of lexis, following metaphorical transfer; descriptive-linguistic and cognitive research of the general and particular conceptual features that are preserved within this type of internal terminology. The approach is descriptive-contrastive.
One of the conclusions of the research is that the central sphere of specialized lexis, by expansion, supplies terms that may be specialized or may go through a new metaphorical transfer without altering the degree of scientificity in the target fields.
Translator Trainees’ Reading Literacy, Problem Solving, and Translation Skills A Comparative Study
Authors: Kovács Gabriella , Harangus Katalin 
Published: January 2020

Abstract
Linguistic and cultural mediators, such as translators, interpreters, and language teachers, need complex and well-developed language skills in all the languages they work with. In this study, we examine the connections and correlations among the following skills: reading literacy in native language, reading literacy in foreign language, problem solving and translation. Three of these skills (reading in native and foreign language and problem solving) are evaluated on a three-level scale based on the three cognitive processes used in Programme for International Student Assessment (PISA) assessments (location of information, understanding, evaluation and reflection) (Organisation for Economic Co-operation and Development – OECD 2018). The methodology of measuring reading comprehension in native language and problem-solving skills has already been developed and applied by our research group (Pletl 2019, Harangus 2018); therefore, after assessing the foreign language reading literacy and translation skills, we will be able to analyse the translator trainees’ results based on the aforementioned three-level scale and examine possible connections and correlations between the different but interrelated skills. With an interdisciplinary approach, this study concentrates on revealing the overlaps and meeting points, the spaces in between the use of these skills.
Low Power Full Adder Design Using PTM Transistor Model
Authors: Devnath Bappy Chandra , Biswas Satyendra N. 
Published: January 2020

Abstract
At present the processing power of the digital electronic chip is enormous and that has been possible because of the continuous improvement of the design methodology and fabrication technology. So, the data processing capability of the chip is increased significantly. Data processing in the electronic chip means the arithmetic operation on that data. For that reason, ALU is present in any processor. Full adder is one of the critical components of arithmetic unit. Improvement of the full adder is necessary for improving the computational performance of a chip. In order to design an efficient full adder, designer should choose an appropriate logic style. In this research, two new model of full-adder circuits are designed and analyzed using Pass Transistor logic in order to reduce power consumption and increase operational speed. The first proposed adder consists of 8 transistors and the second one consists of 10 transistors. LTSPICE is employed for simulating the proposed circuits using16nm low power high-k strained silicon transistor model. The overall performance of the proposed adder circuits and comparative results demonstrate the superiority of the proposed model.
A survey in the design and control of automated guided vehicle systems
Authors: Vancea A. P. , Orha I. 
Published: January 2020

Abstract
Automatic guided vehicles (AGVs) play an important role in the small-scale industry as well as the largescale industry in handling materials inside factories from one place to another. In the last days, the materials to be handled are more numerous and as production and demand increase, it strongly influences the transport of materials in desperate need of a vehicle to distribute, position the materials within the industry. AGVs are generally installed with wires at ground level and signals are transmitted through them to be controlled. Due to the emergence of the AGV, the workload of the human being gradually decreased and the production efficiency increased. Thus, the need for an AGV has become more technologically important in the advanced robotic world. Normally, these systems are integrated into a global production system, where is a need to make direct changes in the design and planning of the floor store to get most of them. But in the rapidly changing production system and the adaptable floor store, the implementation of AGV has become very important and difficult, because it depends on many systems, such as wires, frequency, total production, etc. Therefore, it is necessary to develop an independent AGV, which can operate on its own and make decisions based on changes in the environment.
Digital Controller Design of an Industrial Sewing Station using Evolutionary Algorithms
Authors: Moretti Eric Henrique , Coelho Gustavo Gonçalves , Coelho João Paulo 
Published: January 2020

Abstract
Development of increasingly efficient production methods is a competiveness driving factor for any company. Today, many of these improvements include the integration of technology-based solutions into processes traditionally operated by humans. In this context, the present work aims to report the controller performance of a prototype developed for semi-automatic sewing stations. This project was fostered by “Factory Play”, a Portuguese company that produces inflatable structures, under the technical supervision of the Polytechnic Institute of Bragança. At the present time, the sewing station travel speed is regulated by an embedded PID controller that has been previously tuned using classical methods. However, even if the overall performance is currently acceptable, additional experiments were made regarding the use of evolutionary based algorithms to attain a better dynamic response and flexibility. This article present the results obtained using those methods where it is possible to confirm that the use of evolutionary algorithm will simplify the design process while consistently leading to a suitable solution.
Modern Management of Hypertensive Emergencies
Authors: Marton-Popovici Monica 
Published: January 2020

Abstract
Hypertensive emergencies (HE) represent critical conditions in which extremely high blood pressure values are accompanied by acute hypertension-mediated organ damage. In this clinical setting, the main therapeutic goal is represented by the immediate reduction of blood pressure, in order to limit the extension or promote the regression of target organ damage. At present, HE are classified according to the condition or target organ involved, into: (1) malignant hypertension with or without thrombotic microangiopathy; (2) coronary ischemia or acute cardiogenic pulmonary edema; (3) acute stroke or hypertensive encephalopathy; (4) acute aortic dissection or aneurysm; and (5) eclampsia or severe preeclampsia/HELLP syndrome. The management of these conditions is different in relation to the complex pathophysiology involved in each of these types. This mini-review presents the main characteristics and management strategy for different forms of HE, revealing the particularities of management strategy for each of them.
Business Management Strategies for Business Development. Organization of the Territory and Planning of Construction Works
Authors: Postavaru Nicolae , Draghici Gabriela , Filip Cosmin , Mohammed Al-Rubaye , Mohammed Sami Mahdi 
Published: January 2020

Abstract
In order for a project to be built with respect to quality, budget compliance and execution time - all required conditions, a professional management of site-level operations is required. The technical complexity, the importance of performing the work on the set deadline, the resource constraints and the substantial costs require the planning, programming and rigorous control of all the works.
Creating a Sustainable Business Model in the Construction Firm
Authors: Marichova Aneta 
Published: January 2020

Abstract
Every firm today is facing significant problems which are a consequence of the influence of external and internal factors. This necessitates strategic changes in its activities, which focus on the development of the basic elements of intangible assets - people, knowledge and system, whose effective combination allows building competitive advantage and company growth. The main, specific intangible resource of the company is the business model itself, which is the economic basis of the strategic behavior of the company. From this point of view the purpose of the study is: 1) developing a sustainable business model for the construction firm, 2) analyzing the mechanism by which the manager creates and/or develops his own sustainable business model, taking into account the specifics of the construction market.
Effect of Number and Position of Rotational Friction Dampers on Seismic Response of Steel Frame
Authors: Oance Ionuț-Sergiu , Gelmambet Sunai 
Published: January 2020

Abstract
This paper deals with effect of number and position of friction dampers on seismic response of 2D steel frame. For the present study four structures with six storeys are subjected to a time history analysis. For each story are using two, four and six friction dampers with different positions keeping slip load and stiffness constant. To study the effect of number and position of dampers in structures, are analysed the time period, top roof displacement, maximum base shear and percentage energy dissipated in accordance with energy induced in the frame. The results indicate that number and placement of damper affects the structural response. A large number of dampers do not always lead to best benefit in terms of energy dissipation.