bluuebunny/crossref_metadata_2025 huggingface dataset:
Characterization of the Dynamic Properties of Clay–Gravel Mixtures at Low Strain Level
Authors: Huang Xianwen , Zhou Aizhao , Wang Wei , Jiang Pengming
Published: February 2020

In order to support the dynamic design of subgrade filling engineering, an experiment on the dynamic shear modulus (G) and damping ratio (D) of clay–gravel mixtures (CGMs) was carried out. Forty-two groups of resonant column tests were conducted to explore the effects of gravel content (0%, 10%, 20%, 30%, 40%, 50%, and 60%, which was the mass ratio of gravel to clay), gravel shape (round and angular gravels), and confining pressure (100, 200, and 300 kPa) on the dynamic shear modulus, and damping ratio of CGMs under the same compacting power. The test results showed that, with the increase of gravel content, the maximum dynamic shear modulus of CGMs increases, the referent shear strain increases linearly, and the minimum and maximum damping ratios decrease gradually. In CGMs with round gravels, the maximum dynamic shear modulus and the maximum damping ratio are greater, and the referent shear strain and the minimum damping ratio are smaller, compared to those with angular gravels. With the increase of confining pressure, the maximum dynamic shear modulus and the referent shear strain increase nonlinearly, while the minimum and maximum damping ratios decrease nonlinearly. The predicting equation for the dynamic shear modulus and the damping ratio of CGMs when considering confining pressure, gravel content, and shape was established. The results of this research may put forward a solid foundation for engineering design considering low-strain-level mechanical performance.
The Exposure of European Union Productive Sectors to Oil Price Changes
Authors: Ferreira Paulo , Pereira Éder J. A. L. , Pereira Hernane B. B.
Published: February 2020

Oil is one of the most important products in the world, being used for fuel production but also as an input in several industries. After the oil shocks of the 1970s, which caused great turbulence, the interest in the analysis of this particular product grew. The analysis of the comovements between oil and other assets became a hot topic. In this study, we propose an analysis of how oil price correlates with several industry indexes. The detrended cross-correlation analysis coefficient ( ρ DCCA ) is used, with data from 1992 to 2019, and we analyze not only the correlation between oil and several Euro Stoxx indexes during the whole sample, but also how that correlation evolved for the different decades (1990s, 2000s and 2010s). Naturally, oil and gas are the sectors that correlate the most with crude oil, with correlation coefficients reaching levels higher than 0.6 in some cases. However, the results also indicate that all sectors are now more exposed to oil price variations than in the past, with the financial sector as one of the sectors with the greatest increase in correlation.
The Implications of Urbanization for Inhabitants’ Relationship to Their Residential Environment
Authors: Buchecker Matthias , Frick Jacqueline
Published: February 2020

In the last decades, prosperous regions in Europe have experienced a tremendous rate of urbanization. In spite of considerable research efforts in the last decades, the socio–psychological implications of urbanization are still poorly understood. This paper aims to systematically determine the influence of urbanization on the relationships between inhabitants and their residential environment including their place attachment, place-satisfaction, civic participation, and proximity behavior. To achieve these goals, standardized cross-sectional questionnaires were administered to random samples (N = 1200 each) of the residential population in four study areas in Switzerland, which represent rural, peri-urban, suburban, and urban stages of urbanization. Statistical analysis revealed that place attachment was mainly influenced by the inhabitants’ good experiences in the place, their sense of local community, their local social contacts, and the level of urbanization. A structural equation model (SEM) further showed that the degree of urbanization of the setting had a direct negative influence on place attachment, while place attachment appeared to be a key moderator of, and a main driver for, place-satisfaction, civic participation, and proximity behavior. A key to reducing negative impacts of urbanization is therefore to offer optimal opportunities for access to appropriate public places
A Systematic Literature Network Analysis of Existing Themes and Emerging Research Trends in Circular Economy
Authors: Khitous Fatima , Strozzi Fernanda , Urbinati Andrea , Alberti Fernando
Published: February 2020

The debate about Circular Economy (CE) has been increasingly enriched by academics through a vast array of contributions, based on several theoretical perspectives and emanating from several research domains. However, current research still falls short of providing a holistic and broader view of CE, one that combines existing themes and emerging research trends. Accordingly, based on a Systematic Literature Network Analysis, this paper tackles this gap. First, a Citation Network Analysis is used to unearth the development of the CE literature based on papers’ references, whilst the Main Path is traced to detect the seminal papers in the field through time. Second, to consider the literature in its broader extent, a Keywords Co-Occurrence Network Analysis is conducted based on papers’ keywords, whereby all papers in the dataset, including the non-cited papers, are assessed. Additionally, a Global Citation Score analysis is conducted to uncover the recent breakthrough research, in addition to the Burst Analysis used to detect the dynamic development of CE literature over time. By doing so, the paper explores the development of the CE body of knowledge, reveals its dynamic evolution over time, detects its main theoretical perspectives and research domains, and highlights its emerging topics. Our findings unfold the evidence of eight main trends of research about CE, unearth the path through which the CE concept emerged and has been growing, and concludes with promising avenues for future research.
Protection and Safety Evaluation of Live Constructions Derived from the Pgm− and pPCP1− Yersinia pestis Strain
Authors: Wang Xiuran , Singh Amit K. , Sun Wei
Published: February 2020

Based on a live attenuated Yersinia pestis KIM10(pCD1Ap) strain (Pgm−, pPCP1−), we attempted to engineer its lipid A species to achieve improvement of immunogenicity and safety. A mutant strain designated as YPS19(pCD1Ap), mainly synthesizing the hexa-acylated lipid A, and another mutant strain designated as YPS20(pCD1Ap), synthesizing 1-dephosphalated hexa-acylated lipid A (detoxified lipid A), presented relatively low virulence in comparison to KIM10(pCD1Ap) by intramuscular (i.m.) or subcutaneous (s.c.) administration. The i.m. administration with either the KIM10(pCD1Ap) or YPS19(pCD1Ap) strain afforded significant protection against bubonic and pneumonic plague compared to the s.c. administration, while administration with completely attenuated YPS20(pCD1Ap) strain failed to afford significant protection. Antibody analysis showed that i.m. administration induced balanced Th1 and Th2 responses but s.c. administration stimulated Th2-biased responses. Safety evaluation showed that YPS19(pCD1Ap) was relatively safer than its parent KIM10(pCD1Ap) in Hfe−/− mice manifesting iron overload in tissues, which also did not impair its protection. Therefore, the immune activity of hexa-acylated lipid A can be harnessed for rationally designing bacteria-derived vaccines.
EFEKTIFITAS LAYANAN BIMBINGAN KELOMPOK DENGAN PENDEKATAN RATIONAL EMOTIVE BEHAVIOR THERAPY (REBT) UNTUK MENINGKATKAN HUBUNGAN SOSIAL
Authors: Afa Nada Mu' , Abdi Sofyan , Batubara Salohot
Published: February 2020

Penelitian ini bertujuan untuk mengetahui efektifitas bimbingan kelompok untukmeningkatkan hubungan sosial pada siswa. Metode penelitian ini menggunakan QuasiEksperimen dengan desain penelitian Nonequivalent Control Group Design. Melibatkan16 siswa, 8 siswa sebagai kelompok eksperimen dan 8 mahasisiwa sebagai kelompokkontrol. Hasil penelitian ini menunjukkan bahwa kelompok eksperimenyang diberikan treatment mengalami peningkatan hubungan sosial sedangkan kelompokkontrol tidak mengalami peningkatan.
Dual Channel TV and Fans Controllers Based on Android Smartphones
Authors: Nurcahyana Mohamad Lukman
Published: February 2020

Abstract - This research will focus on the design of dual channel television control systems and fan speed control. The design of a dual channel TV controller system and fan speed control uses wireless media as a link between an Android smart phone, Raspberry Pi B +, TV, and fan. To design a dual channel TV controller system and control wind kipsa, it includes an Android smartphone, wi-fi module type TL-WN832N TP-Link and Raspberry pi B +. Android smartphones function as TV controllers and fans with applications installed on Android smartphones. The TP-Link TL-WN832N wi-fi module functions as a wireless multimedia link between the Raspberry Pi B + and Android smartphones. Raspberry pi B + functions like processing data sent by an Android smartphone to control the TV or fan. Thus, the system design tool can replace 2 controllers and TV fans in one device that can control the TV and fan using an Android smartphone

Keyword : Android smartphone, TP-Link TL-WN832N Wi-Fi module, Raspberry Pi B +
Single Axis Quadcopter using Proportional Integral Derivative (PID) based Labview
Authors: Priansyah Rivaldi
Published: February 2020

Abstract - Quadcopter is a Miniature Aerial Vehicle (MAV) that has 4 propellers with the ability to take off, land vertically and the ability to negotiate a narrow space that allows it to be used in a messy indoor area. Because of this ability the quadcopter has recently been considered for various applications both in the military and civilian fields. In particular, quadcopter has been explored for applications such as surveillance and disaster exploration. Quadcopter is currently widely used because it has the ability to make movements that are difficult for other types of aircraft, as well as the ability to fly and land vertically in a narrow place with a complete system of rotor stability mechanisms. In this study an automatic simulation was carried out on a laptop with Labview-based programming software, the simulation in this study only used one angle on the quadcopter so that it only needed 2 motors as propeller drives or commonly called single axis quadcopter. An integral derivative (PID) controller for roll angle movement on a single shaft quadcopter is expected to be able to restore the roll position according to the setpoint and support to optimize. A control system is needed to adjust roll angle movement, so that it can move stably and be able to overcome a given disturbance. As a roll angle movement controller PID controller is used, whose parameters are determined by the Labview application program. This PID parameter in the program in Labview as well as experiment simulation. Based on the calculation results, get the value Kp = 0.8, Ki = 25, Kd = 0.004. The control system is able to reduce oscillation with a 2 degree error rate from the input. With the PID coefficient the system is able to restore the roll angle condition when given a simulation error. Keyword : Single Axis Quadcopter, Quadcopter, PID, roll, Labview
O Lazer de Universitários
Authors: Rosado Daniela Gomes , Silva Vera Lucia Teixeira , Miranda Maria Luiza de Jesus , Silva Sheila Aparecida P. dos Santos
Published: February 2020

Este estudo objetivou quantificar e analisar a produção científica sobre lazer de universitários entre os anos 2001-2016 nas bases de dados Scielo, BVS, Periódicos Capes e SportDiscus utilizando os descritores: lazer, universitário e o conector and. Os critérios de inclusão foram: artigos produzidos no século XXI, publicados em inglês, português ou espanhol. A análise dos dados foi feita com base em 13 categorias preestabelecidas. Catorze estudos foram selecionados, a maioria produzida nos últimos três anos; tiveram autoria coletiva; autores vinculados a Universidades Públicas; predominantemente em São Paulo; predominantemente ligados à área Psicologia; utilizam questionários adaptados com questões abertas e fechadas; são abordagens de estudo voltadas ao tipo de atividades desenvolvidas por estudantes nos momentos de lazer; e o maior número de publicações ocorreu na revista Licere.
PENTINGNYA ANALISIS SWOT UNTUK MENINGKATKAN KINERJA SDM (Studi Kasus Usaha Mikro Kecil dan Menengah Malang)
Authors: Suci Rahayu Puji , Hermawati Adya , Suwarta Suwarta
Published: February 2020

AbstrakPerlunya evaluasi strategi dalam menghadapi pasar yang dinamis dapat mendukung suatu organisasi untuk mampu berkompetisi, bahkan mampu memenangkan persaingan. Namun UMKM walaupun memiliki fleksibilitas dan ketahanan yang tinggi dalam perekonomian, beberapa keterbatasan seperti kapabilitas finansial dan sumber daya manusia membuat UMKM harus dapat menentukan strategi yang tepat dalam meraih keunggulan kompetitif. Tujuan dari penelitian ini adalah menentukan strategi pengembangan kinerja sumber daya manusia pada UMKM di Kota Malang melalu implementasti analisis SWOT (Strengths, Weakneses, Opportunities, dan Threatments). Hasil menunjukkan indikator Strength yang paling tinggi adalah S5 (Pelayanan) yaitu sebesar 4.20. Sementara itu, indikator Weakness yang paling tinggi adalah W4 (Kualitas Sumber Daya Manusia), yaitu sebesar 3.20. Kemudian indikator Opportunity yang paling tinggi adalah O1 (Oleh-oleh khas daerah) dan O5 (Bahan Baku) yaitu sebesar 4. Sementara itu, indikator Threat yang paling tinggi adalah T3 (Pesaing pendatang baru), yaitu sebesar 2.3. Kemudian untuk lokasi titik potong A, B, C, dan D, yaitu titik E, berada kuadran I (Strategi agresif). Dengan demikian, analisis SWOT terhadap UMKM di Kota Malang menunjukkan posisi yang bagus, sehingga dapat diterapkan strategi SO.Kata kunci: SWOT, UMKM, strategi peningkatan kinerja.AbstractThe need for evaluation of strategies in dealing with dynamic markets can support an organization to be able to compete, even able to win the competition. However, although UMKM has high flexibility and resilience in the economy, several limitations such as financial capabilities and human resources make MSMEs must be able to determine the right strategy in achieving competitive advantage. The purpose of this study is to determine the strategy for developing human resource performance at MSMEs in Malang through the implementation of SWOT analysis (Strengths, Weaknesses, Opportunities, and Treatments). The results show the highest Strength indicator is S5 (Service), which is equal to 4.20. Meanwhile, the most top Weakness indicator is W4 (Quality of Human Resources), which is 3.20. Then the highest Opportunity indicator is O1 (By-Products typical) and O5 (Raw Materials) that is equal to 4. Meanwhile, the most top Threat indicator is T3 (Competing new entrants), which is 2.3. Then for the intersection points A, B, C, and D, which are point E, are in quadrant I (aggressive strategy). Thus, SWOT analysis of MSMEs in Malang shows a good position, so that SO strategies can be applied.Keywords: SWOT, SMEs, performance improvement strategies
Note on Bicomplex Matrices
Authors: ÖLÇEK Canan , NURKAN Semra Kaya
Published: February 2020

In this paper, we consider bicomplex numbers and bicomplex matrices. Firstly, we give some propertiesof bicomplex numbers.After that we investigate bicomplex matrices using properties of complex matrices.Then we define the complex adjoint matrix of bicomplex matrices and we describe some of theirproperties. Furthermore, we give the definition of q-determinant of bicomplex matrices.
Isometry Groups of Chamfered Cube and Chamfered Octahedron Spaces
Authors: Gelişgen Özcan , YAVUZ Serhat
Published: February 2020

Polyhedra have interesting symmetries. Therefore they have attracted the attention of scientists andartists from past to present. Thus polyhedra are discussed in a lot of scientific and artistic works. There areonly five regular convex polyhedra known as the platonic solids. There are many relationships betweenmetrics and polyhedra. Some of them are given in previous studies. In this study, we introduce two newmetrics, and show that the spheres of the 3-dimensional analytical space furnished by these metrics arechamfered cube and chamfered octahedron. Also we give some properties about these metrics. We showthat the group of isometries of the 3-dimesional space covered by CC􀀀metric and CO􀀀metric are thesemi-direct product of Oh and T(3), where octahedral group Oh is the (Euclidean) symmetry group of theoctahedron and T(3) is the group of all translations of the 3-dimensional space.
Relations among Bell polynomials, central factorial numbers, and central Bell polynomials
Authors: Qi Feng , Guo Bai-Ni
Published: February 2020

In the note, by virtue of the Fa\`a di Bruno formula and two identities for the Bell polynomials of the second kind, the authors derive three relations among the Bell polynomials, central factorial numbers of the second kind, and central Bell polynomials. The Bell numbers Bk for k ≥ 0 can be generated [4, 7, 12] byee t−1 =X∞ k=0Bktk k!= 1 + t + t 2 +5 6 t 3 + 5 8 t 4 + 13 30 t 5 + 203 720 t 6 + 877 5040 t 7 + · · · As a generalization of the Bell numbers Bk for k ≥ 0, the Bell polynomials Tk(x) for k ≥ 0 can be generated [8– 10, 15, 17] by e x(e t−1) = X∞ k=0 Tk(x) t k k! = 1 + xt + 1 2 x(x + 1)t 2 + 1 6 x x 2 + 3x + 1 t 3 + 1 24 x x 3 + 6x 2 + 7x + 1 t 4 + 1 120 x x 4 + 10x 3 + 25x 2 + 15x + 1 t 5 + · · · (1.1) The polynomials Tk(x) for k ≥ 0 are also called [11, 18] the Touchard polynomials or the exponential polynomials. It is clear that Tk(1) = Bk. The central factorial numbers of the second kind T(n, k) for n ≥ k ≥ 0 can be generated [1, 6] by 1 k! 2 sinh t 2 k = X∞ n=k T(n, k) t n n! , where sinh t = e t − e −t 2 (1.2) is the hyperbolic sine function. The central Bell polynomials B (c) k (x) for k ≥ 0 can be generated [5] by exp 2x sinh t 2 = X∞ k=0 B (c) k (x) t k k! .
S-generalized Mittag-Leffler Function and its Certain Properties
Authors: AGARWAL Praveen , CETİNKAYA Aysegul , JAİN Shilpi , KIYMAZ İ. Onur
Published: February 2020

In 2014, S-generalized beta function which consist ofseven parameters, defined and studied by Srivastava et al. [H. M.Srivastava, P. Agarwal and S. Jain, Generating functions for thegeneralized Gauss hypergeometric functions, Appl. Math. Comput., 247 (2014), pp. 348-352]. In this paper, by using S-generalizedbeta function, we introduce a new generalization of Mittag-Lefflerfunction. This new generalization of Mittag-Leffler function is consist of eleven parameters. We also investigate some of its certainproperties such as integral representations, recurrence formulas andderivative formulas by using classical and fractional derivatives.Furthermore, we determine its Mellin, beta and Laplace integraltransforms.
Elementary Approachs on De Sitter Space
Authors: ÖZTÜRK Emre , YAYLI Yusuf
Published: February 2020

In this paper, we characterize the de Sitter space by means of spacelike and timelike curves that fullylies on it. For this purpose, we consider the tangential part of the second derivative of the unit speedcurve on the hypersurface, and obtain the vector equations of the geodesics. We ﬁnd the geodesics ashyperbolas, ellipses, and helices. Moreover, we give an example of null curve with constant curvature in4−dimensional Minkowski space and we illustrate the geodesics of S11(r) × R .
ORGANS OF THE SPECIAL COMPETENCE, THAT CARRY OUT SUPERVISION AND CONTROL OF AGRICULTURE
Authors: MANGORA Tamila
Published: February 2020

At research of government control of agriculture there is a question in relation to the role of public authorities in this process. It is a direct participation of public authorities in the process of management in Agroindustrial complex, and the participation of the state as a proprietor of the agricultural enterprises based on a public domain, in an agricultural production, and also indirect adjusting. The last neither consists in the exception of direct influence on a directly agrarian production and market, developed in nor mated fixing of certain rules of access to the market and realization of activity in the field of an agrarian production.

A concept is given organs of the special competence – it central executive bodies and their subdiving into places that realize management functions in industry of health protection of consumer’s standardization Metrologic and certification veterinary medicine quarantine of plants are specially authorized Certainly basic roblems and prospects of development of the system of the special organs that carry out a supervision and control of agriculture
STATE AND FEATURES OF FRUIT GROWING DEVELOPMENT IN VINNYTSIA REGION
Authors: SAMBORSKA Oksana
Published: February 2020

The article investigates the current state and peculiarities of horticulture development in Vinnytsia region, which are preceded by special natural-climatic and economic conditions. The factors of external and internal environment on the prospects of horticulture development in the region are considered. The analysis of the enterprises of Vinnytsia region, which form the basis of growing and processing of fruit and vegetable products. The investigated enterprises of Vinnytsia region have developed a marketing strategy for entering new international markets of products, improved advertising and product quality, sorting and transportation conditions. The cost of production collected using manual labor is several times higher than the cost of collected and sorted products at the enterprises with mechanized machinery. In order to fully evaluate the volume of horticultural products in the region, the yield and gross harvest for individual years were investigated. The increase in the volume of fruit and berry production contributes to the development of processing enterprises in Vinnytsia region and to entering new markets with finished products in fresh or frozen form. Typical vegetable products exported to European Union countries are presented.

For an example of consumption of basic products per person according to the medical standards defined by the World Health Organization are given. There is a gradual decrease in consumption of vegetables, fruits and berries per person, insolvency of consumers, difficult working conditions, lack of state support have led to such results.

Today, the development of fruit and vegetable production contributes to the economic growth of the agricultural sector not only in the analyzed region, but in Ukraine as a whole. Growing quality horticultural products at an affordable price for all categories of the population allows to increase the consumption of such products, which in turn improves the well-being and health of the population. The conducted researches help to develop a comprehensive program of food security of the region and the country for providing full nutrition of the population in accordance with medical norms.
On Unbalanced Boolean Functions with Best Correlation Immunity
Authors: Krotov Denis S. , Vorob'ev Konstantin V.
Published: February 2020

It is known that the order of correlation immunity of a nonconstant unbalanced Boolean function in $n$ variables cannot exceed $2n/3-1$; moreover, it is $2n/3-1$ if and only if the function corresponds to an equitable $2$-partition of the $n$-cube with an eigenvalue $-n/3$ of the quotient matrix. The known series of such functions have proportion $1:3$, $3:5$, or $7:9$ of the number of ones and zeros. We prove that if a nonconstant unbalanced Boolean function attains the correlation-immunity bound and has ratio $C:B$ of the number of ones and zeros, then $CB$ is divisible by $3$. In particular, this proves the nonexistence of equitable partitions for an infinite series of putative quotient matrices. 

We also establish that there are exactly $2$ equivalence classes of the equitable partitions of the $12$-cube with quotient matrix $[[3,9],[7,5]]$ and $16$ classes, with $[[0,12],[4,8]]$. These parameters correspond to the Boolean functions in $12$ variables with correlation immunity $7$ and proportion $7:9$ and $1:3$, respectively (the case $3:5$ remains unsolved). This also implies the characterization of the orthogonal arrays OA$(1024,12,2,7)$ and  OA$(512,11,2,6)$.
The Study of Analysed Biochemical Parameters on Fruits of Prunus cerasifera Ehrh. Biotypes
Authors: Morarita Sinziana Venera , Hossu Ana Maria , Georgescu Andreea Antonia
Published: February 2020

Prunus cerasifera Ehrh. fruits, as well as other stone fruits, have a number of features which make can be used: fresh consumption, in canned food industry and for the manufacture of brandy. In this paper, some fruits of Prunus cerasifera Ehrh. biotypes found in Fruit -Growing Area Voine�ti were biochemically analyzed (parameters were: soluble dry matter, vitamin C, titratable acidity expressed in malic acid). The research was carried out over two consecutive years, 2013 and 2014 and 14 biotypes were analyzed: yellow wax cherry 9 and 5 red wax cherry harvested from the area Voinesti (Dambovita).
Antisepsis, Disinfection Sterilization - Methods Used in Dentistry
Authors: Balan Gabriela , Grigore Camelia Ana , Budacu Cristian Constantin , Calin Alina , Constantin Mihai , Luca Catalina Mihaela
Published: February 2020

The Pasteur principles regarding the cause of infection and the measures that need to be taken in order to prevent it have become a necessity of the first rank, representing, at the same time, the decisive factor of progress in modern dentistry. Nowadays, based on these principles, from the simplest bandage to the most complex surgery, these are carried out with the help of materials, dental hands and a surgery area where the pathogenic germs have been destroyed. These measures are based on asepsis and antisepsis, methods that perform the disinfection. Asepsis represents the prophylactic side of the disinfection and addresses all the moments that present the risk of contamination. It represents the set of measures by means of which the contact between germs and surgery or accidental plague is avoided. It is a prophylactic method. Antisepsis represents the totality of the means by which the destruction of the germs present in a plague, on the skin or in the environment is sought; it is a curative method. The main mechanisms of action of antiseptics on microorganisms are: altered outer membrane, amino group blockage, tiolitic group blockage, inhibition of ergosterol synthesis, cytoplasmic membrane alteration, energy decoupling, intracytoplasmic clotting. The study comprises 135 sterilizations performed over a period of two years; 107 (79.26%) were done in autoclaves, 7 (5.18%) in ethylene oxide, and 21 (15.56%) in hydrogen peroxide. The use of an antiseptic for long periods of time must be avoided due to the fact that, in the case of those containing heavy metals in their structure, they can be cumulated in the human body, and when toxic concentrations are reached, various toxicities can be triggered.
Polyazulenes Based Materials for Heavy Metal Ions Detection
Authors: Oprisanu Alexandra , Lazar Ioana Georgiana , Pop Maria Daniela , Ungureanu Eleonora Mihaela , Isopescu Raluca , Birzan Liviu
Published: February 2020

Azulene is a special monomer used to functionalize electrodes due to its high polarizability, because it makes possible spontaneous electron drift from the five-membered ring to the seven-membered ring. Our study concerns the electrochemical characterization by cyclic voltammetry, differential pulse-voltammetry and rotating disk electrode voltammetry of a new azulene monomer, 4-(5-isopropyl-3,8-dimethylazulen-1-yl)-2,6-bis((E)-2-(thiophen-2-yl)vinyl) pyridine (L). It has been used to obtain complexing modified electrodes by electrochemical polymerization. PolyL films modified electrodes have been characterized by cyclic voltammetry in ferrocene probe solution. The complexing properties of polyL based functional materials have been investigated towards heavy metals (Pb, Cd Hg, Cu) by preconcentration � anodic stripping technique.
Enzymological and Physicochemical Evaluation of the Effects of Soil Management Practices
Authors: Samuel Alina Dora , Tit Delia Mirela , Melinte (Frunzulica) Carmen Elena , Iovan Ciprian , Purza Lavinia , Gitea Manuel , Bungau Simona
Published: February 2020

Soil enzymes activities have been considered as sensitive indicators of alteration soil quality by management. In order to obtain new data on the soil enzymological effects of soil management practices, we have determined some enzymatic activities in a preluvosoil submitted to a complex tillage and crop rotation experiment at the Agricultural Research and Development Station in Oradea (Bihor County). Actual and potential dehydrogenase, acid phosphatase and catalase activities were investigated in a split plot experiment where tillage (no-till and conventional tillage) was the main plot and crop rotation (Wheat/Maize, W/M; Soybean/Maize, S/M; Oats-Clover/maize, O-C/M) was the subplot. Soil samples were taken at 0-20, 20-40 and 40-60 cm. Each activity in both non-tilled and conventionally tilled soil under maize crop decreased with increasing sampling depth. It was found that no-till, in comparison with conventional tillage, resulted in insignificantly higher (p]0.10) soil enzymatic activities in the 0-20 cm layer and insignificantly (at least at p]0.10) lower activities in the deeper layers, excepting actual and potential dehydrogenase activities in the 40-60 cm layer, in which these activities were significantly lower(0.02]p]0.01). Based on the absolute values of the enzymatic activities, the enzymatic indicator of soil quality (EISQ) was calculated. The EISQ values ranged between 0.201 and 0.974 indicating the presence of high enzymatic activities in the upper layer and a moderate intensity of the enzymatic activities in the deeper layers. A significant correlation between soil enzyme activities and physical and chemical indicators was established.
Comparative Study Regarding Atmospheric SO2 Content in Rovinari and Turceni Areas
Authors: Capatina Camelia , Cirtina Daniela
Published: February 2020

The goal of this research study is to compare the air quality of two urban locations from Targu-Jiu County namely Rovinari and Turceni. Measurements of SO2 content with automatic analysers were used as a criterion to asssess the air quality. Rovinari and Turceni areas were chosen for this study due to the fact that there are located two thermal power plants considered high stationary sources with an important contribution to regional and global pollution by sulfur dioxide, nitrogen oxides and dust. Sustainable development of fossil fuel power plants cannot be done without the use of technology to limit or eliminate environmental pollution.
Studies regarding determination of SO2 content in the monitored areas were performed from January to December 2014. By interpreting the results obtained it can be concluded that the concentrations of sulfur dioxide in the ambient air are below the limit value set in legislation. This is mainly due to the developing of the programs for the progressive reduction of annual emissions of sulfur dioxide, nitrogen oxides and dust which was set up by operators of thermal power plants in order to comply with emission limit values. The high level of SO2 concentration in cold season is attributed to intensifying the burning of fossil fuels for household activities.
Spectral Study of Some Lanthanides Complexes with Quaternary Pyridinium Ligands
Authors: Carac Andreea , Boscencu Rica , Carac Geta , Bungau Simona Gabriela
Published: February 2020

Some lanthanides complexes with two N-heterocyclic ligands derived from 4,4`-bipyridinium and 1,2-bis-(4-pyridinium) ethane (noted BP and BPE) were studied in presence of triethylamine and methanol in view of their application as cytotoxic agents. Absorption spectra have been recorded by UV-Vis spectroscopy during the complexation process in solution. The ligands demonstrate preferential arrangements in lanthanide�s electronic structure which is identified much clearly in ultraviolet range. La(III)-BP solution indicates absorption at lmax= 206 nm while La(III)-BPE at lmax of 208 nm. The solution from the Nd(III)-BPE complex synthesis shows the highest absorbance at lmax= 220 nm, compared with Nd(III)-BP at lmax= 212 nm. The bathochromic shifts of the spectral bands can be assigned to the physical interaction of Ln(III) ions with ligands. No major changes were observed in the absorption, hypsochromic and hyperchromic effects when varying the ligand. The complexes spectral properties were performed by dissolving them in methanol in three phases until a complete dissolution of the precipitates was achieved.
Crystal Violet Dye Removal from Aqueous Solutions Using Elodea Canadensis as Biofilter
Authors: Torok Anamaria , Nagy Boldizsar , Tonk Szende , Buta Erzsebet , Szep Robert , Majdik Cornelia , Niculae Alexandra Gabriela
Published: February 2020

The phytoremediation of Crystal violet dye was developed using the aquatic plant Elodea canadensis as biofilter. We analyzed the role of functional groups in phytoremediation by aquatic plants using the Fourier transform infrared spectroscopy (FTIR). The aquatic plant�s abiotic stress responses were evaluated under exposure of 20 - 90 mg/L initial dye concentration, where a significant decrease of the photosynthetic pigments content suggests the plant�s biosynthesis deregulation at higher concentrations. We determined the effect of operational parameters such as contact time, plant quantity initial concentration, initial pH and temperature on the removal efficiency. Data were analysed using the kinetic (pseudo-first- and second-order) and isotherm (Langmuir, Freundlich and Dubinin-Radushkevich) models. Our results show that the phytoremediation process follows the pseudo-second-order kinetic model, meaning that it takes places as chemisorption. The Crystal violet uptake was successfully described using the Freundlich isotherm model as a multilayer adsorption with heterogeneous energetic distribution of active sites.
Modeling and Simulation of a Three Phase Fixed Bed Catalytic Reactor for the Hydrogenation of 2-ethyl-hexenal
Authors: Banu Ionut , Tuta Emil Florin , Bozga Grigore
Published: February 2020

The aim of this work is the investigation, by modelling and simulation, of the liquid phase hydrogenation of 2-ethyl-2-hexenal to 2-ethyl-hexanol, over a modern Cu-Ni catalyst, in an industrial tri-phase trickle bed reactor. The chemical kinetics, hydrodynamic parameters and mass transfer coefficients were evaluated from published data. The mathematical model of the process takes into consideration intraparticle and interphase concentration gradients. The calculated temperature evolution along the catalytic reactor is in a good agreement with measured values from an industrial plant. The results indicate that critical kinetic step of the process is the hydrogen transfer toward the inner catalyst surface and that the process occurs close to gas-liquid equilibrium. The degree of catalyst pellet utilization, evaluated by internal effectiveness factors, is relatively low, being mainly dependent on rapid exhaust of dissolved hydrogen inside the catalyst pellet. The presented results could be useful in process analysis, optimization and control studies.
Reactive Extraction Using Moving Liquid Membranes - Mathematical Model Calibration Through Experiments
Authors: Dinculescu Daniel Dumitru , Gijiu Cristiana Luminita , Lavric Vasile
Published: February 2020

A reactive extraction/back-extraction process was studied experimentally in a two-stage column. The mathematical model of the reactive extraction using a closed loop moving organic liquid membrane, based upon first principle equations, was derived as a set of Partial/Ordinary Differential Algebraic Equations (P/ODAE). The mathematical model, reduced through orthogonal collocation to a system of ODAE, was solved using a self-adaptive Runge-Kutta (RK)-type method. The mathematical model was calibrated using own batch experimental data and a modified genetic algorithm as optimizer.
Good Management Practices in Managing the Most Important Factors to Ensure Dureble Soil Quality
Authors: Ungureanu George , Ignat Gabriela , Boghita Eduard , Costuleanu Luiza , Vintu Catalin Razvan , Bodescu Dan , Bejinariu Costel
Published: February 2020

The importance of sustainable development has started to be acknowledged in Romania as well, once the various pollution sources and the restrictions affecting industrial and agricultural pollution were identified, from an economic and ecological standpoint. Sustainable development represents the need of raising awareness about environmental protection and educating people, and this aspect is reflected by the evolution of communal policies in recent years, policies marked by a shift from an approach based on constraints and sanctions to a higher level of flexibility, based on incentives. The purpose of this paper is to make a recommendation for improving existing policy by making an assessment of economic incentives in order to stimulate farmers to adopt sustainable farming systems of a viable, sustainable agriculture, capable to apply the newest technologies and lead to profit and efficiency, to the economical and organizational consolidation. To analyse the effects of different zone packages on income of farmers and the environment a linear programming model is developed for a typical, 192 ha mixed farm in the Iasi region plain pilot area. The major activities of the farm is keeping dairy cattle, growing fodder (grass, alfalfa, silage maize) and cash crops (winter wheat and maize).
Researches on the Influence of Thermal Treatment on the Mechanical Properties of Titanium Dental Prostheses
Authors: Diaconu Popa Diana , Vitalariu Anca , Holban Cioloca Catalina , Aungurencei Andra , Luca Odette , Tatarciuc Monica
Published: February 2020

The longevity of dental prostheses depends on the strictness of following the clinical-technological algorithm. The main method of obtaining the metallic dental prostheses is casting, which involves a succession of stages that may produce modifications in the alloy structure, that will lead to alteration of its biological and mechanical behaviour. The modification of some technological parameters influences the internal microstructure and, implicitly, the mechanical properties of the metallic dental prostheses.The paper aims to investigate the influence of cooling rate on the mechanical properties of the titanium moulded pieces. We realized 40 samples divided in four groups consisting of 10 samples each: one group as control, and three test groups. The 30 test samples underwent a thermal treatment of homogenization, represented by a heating process up to 400 �C on 0.1� C per second. The samples were maintained at 400 �C for 2 min , and, after that were cooled at different rate: group 2: 70�C/s, group 3: 30�C/s, and group 4: cooled with an average rate, varying from 30 to 70 �C/s. Group 1 was the control group consisted in 10 samples without thermal treatment. The results showed that mechanical properties of the control group are inferior comparing to the samples submitted to the thermal treatment. Among the three groups of samples that have been thermal treated, the samples that have been cooled at an average rate, varying from 30 to 70 �C/s(group 3), have optimal mechanical properties.
Experimental Analysis of Resistance to Electrocorosion of a High Chromium Cast Iron with Applications in the Vehicle Industry
Authors: Florea Costel Dorel , Carcea Ioan , Cimpoesu Ramona , Toma Stefan Lucian , Sandu Ioan Gabriel , Bejinariu Costica
Published: February 2020

We obtained a new Fe-C material, a cast iron with high chromium content. The experimental material was analyzed by microstructural (SEM electronic) and chemical (EDAX characteristic X-ray dispersive energy analysis) point of view. The addition of chromium is aimed to increase the corrosion resistance and durability of FC250 castings used on industrial scale in the manufacture of automotive brake discs. The material was obtained using an industrial scale furnace. The experimental results showed a substantial increase in corrosion resistance by the addition of chromium.
Microstructure and Structural Defects of Bulk Amorphous Fe64Co10Y6B20 Alloy
Authors: Bloch Katarzyna
Published: February 2020

This paper presents studies relating to the structure and soft magnetic properties of the following bulk amorphous alloys Fe64Co10Y6B20. Samples were prepared by injecting the molten alloy into a water-cooled copper mould in the form of rods. On the basis of the performed X-ray diffraction studies and M�ssbauer spectroscopy, it was found that investigated samples were amorphous in the as-cast state. The influence of structural defects on the magnetization process was investigated within high magnetic fields known as the area of the approach to ferromagnetic saturation.
Synthesis and Spectral Characterization of New S-Alkylated 1,2,4-Triazoles as Potential Biological Agents
Authors: Barbuceanu Stefania Felicia , Socea Laura Ileana , Draghici Constantin , Pahontu Elena Mihaela , Apostol Theodora Venera , Barbuceanu Florica
Published: February 2020

In the work we presented the behavior of 5-(4-(4-X-phenylsulfonyl)phenyl)-4-(n-propyl)-2H-1,2,4-triazole-3(4H)-thiones (X= Cl or Br) with some alkylation agents. Thus, new S-alkylated 1,2,4-triazole derivatives were synthesized by reaction of the corresponding 1,2,4-triazole-3-thione derivatives with different �-halogenated compounds (ethyl bromide, ethyl chloroacetate or phenacyl bromide), in basic medium. The structures of synthesized compounds were elucidated by spectral data (1H-NMR, 13C-NMR, mass spectrometry) and elemental analysis.
Xerostomia and Hyposalivation in Patients with Physical and Psychological Disabilities
Authors: Calin Alina Mihaela , Debita Mihaela , Ciurcanu Oana Elena , Scutariu Mihaela Monica , Szalontay Andreea Silvana
Published: February 2020

Disabilities are complex, dynamic, multidimensional and also contested; one or more key functions of the organism can be affected so to diminish an individual�s freedom of expression and of action. The transition from an individual, medical perspective to a structural, social perspective was described as a shift from a medical model to a social model where individuals are more likely considered disabled by the society then by their own bodies. Disabilities represent a part of the human condition due to its bidirectional connection with poverty: the existence of disabilities can increase the risk of poverty, and poverty can increase the risk of disability. The experience of disability that results from the interaction of the state of health, personal factors and environmental factors varies greatly. Stress, anxiety or different unpleasant moments can cause a temporary decrease in salivary flow but a constant decrease can indicate the existence of a serious health problem. Xerostomia represents the subjective sensation of dry mouth. It can be accompanied by hyposalivation, an objective phenomenon but this is not always the case. Even if the patient declares the existence of xerostomia, this does not necessarily imply the existence of hyposalivation. Xerostomia can be determined by modifications in the oral cavity, as the sensitivity level to moistening, adverse reactions to certain drugs (anti-depressants, inhibitors of the conversion enzyme). The handicap, now called disability represents a special condition of the individual, reason why he must benefit of the support of the society and of those around him. Dental treatment in patients with psychiatric disabilities must consider the general and local involutive modifications, the existent overlay polypathologies that can influence the dental treatment. The study was conducted practically and included the direct interaction as part of the medical team and the registration of 145 patients presented on request with various types of psychological disorders, sometimes covered by the mask of somatic disorders, indicating a masked depression, or a physical depression, where the emotional condition of yesterday and today differ very much. Pointing out the role of the dentist in approaching patients with physical and psychical disabilities, motivating and making them aware of the necessity of adopting a proper oral hygiene for preventing oral disorders. The dramatic impact on the psyche and the well-chosen words stressed by the clinician increase patient awareness and motivation in order to make him collaborate during the treatment.
The Relationship Between Biochemical Variables and the Quality of Life in Patients with Chronic Heart Failure
Authors: Plesoianu Carmen Elena , Andriescu Gabriela , Salaru Delia , Arsenescu Georgescu Catalina
Published: February 2020

The aims of this paper were to asses the quality of life with the use of the SF36 Questionnaire in patients with chronic heart failure and to establish the relationship between specific biochemical variables and the various aspects of the quality of life. The scores for various components of the quality of life were significantly affected by hemoglobin levels, creatinine clearance, fibrinogen levels and gamma-glutamyl-transferase levels, while lipid fractions and liver enzymes did not proove to have a significant impact on the quality of life.
The Capacity of a Specific Anti-Streptococcus Mutans Monoclonal Antibodies Test to Identify the Diabetic Patients with Increased Risk of Periodontal Disease
Authors: Ionas Mona , Cernusca Mitariu Sebastian Ioan , Dancila Adela , Ionas Tiberiu Horatiu , Comaneanu Raluca Monica , Botoaca Oana , Cernusca Mitariu Maria Mihaela
Published: February 2020

By means of a specific anti-Streptococcus mutans monoclonal antibodies test we want to identify the diabetic patients which have an increased risk to develop the periodontal disease. The highest percentage, of 88.1% of all patients included in this study represents the subjects with a level greater than 500,000 cfu / mL of streptococcus mutans. The Kruskal-Wallis test reveals a value of p = 0.283 resulted from the status of diabetes in patients and the level of streptococcus mutans in saliva. In conclusion, the status of diabetes in patients seems not to influence the salivary level of mutans streptococci determined with the method used in our study.
Synthesis, Characterization and Biological Study of a New Mannich Base, 2-[(4-fluorophenyl)(phenylamino)methyl] cyclopentanone (FPC) and its Transition Metal Complexes with Cu(II), Ni(II), Co(II), Fe(II) and Zn(II)
Authors: Liaqat Muhammad , Mahmud Tariq , Imran Muhammad , Iqbal Mazhar , Muddassar Muhammad , Ahmad Tauqeer , Mitu Liviu
Published: February 2020

One pot Mannich reaction involving three components (4-fluorobenzaldehyde, aniline, cyclopentanone) was performed using ethanol as a solvent. The resulting Mannich base (FPC) was isolated and further reacted with chloride salts of Cu(II), Ni(II), Co(II), Fe(II) and Zn(II) ions to afford respective metal complexes. The structure of synthesized ligand and transition metal complexes were elucidated on the basis of IR, 1H NMR, 13C NMR, mass spectroscopy and elemental analysis. The geometries of the resulting complexes were proposed on the basis of electronic spectroscopic data and magnetic moment. The anti-enzymatic activity of the ligand and its metal complexes were carried out against urease. FPC shows potent antiurease activity with IC50 value (0.83� 0.002 �M) which is greater than standard. The Cu-complex shows excellent inhibitory action with IC50 value (16.87� 0.03 �M) while other complexes i.e Co-complex (35.59� 0.04 �M) and Ni-complex (49.93� 0.01 �M) exhibit good to moderate IC50 values as compared with control thiourea (IC50 value, 21.25� 0.15 �M). Molecular docking studies were also done on the antiurease activities of FPC and its complexes.