bluuebunny/crossref_metadata_2025 huggingface dataset:
On the Turns of Digital Images
Authors: Parfenov P. G.
Published: March 2019

The images built on the basis of rectangular and hexagonal lattices are discussed in the article. For images on a rectangular lattice a formula is proposed, which gives approximate values of the components of a characteristic set of coefficients when turning at an arbitrary angle by the method of the nearest neighbor. The characteristic sets are presented in the form of diagrams, an experimental evaluation of errors is made. It was confirmed a good agreement with the predicted value component of characteristic sets and those which were obtained experimentally. For images built on the basis of a hexagonal lattice was offered a similar formula for the approximation of the components of the characteristic set for rotating at any angle, when this was applied to the modification of the nearest neighbor method for the preservation of coherence, as it was discovered its violation in some cases on a hexagonal lattice. On the basis of four-pixel fragments are built diagrams, which show a good agreement of predicted values and the obtained ones in the experiment. It was defined a system of three-pixel hexagonal fragments to which the theorem is proved on the Eulerian characteristic and were offered analytical expressions, which allow to avoid experimental detection of the characteristic sets of coefficients for all possible reference angles. Their use requires to produce only one such experiment.
Dynamics of Population Patch Distribution
Authors: Kirillov Alexander N. , Danilova Inna V.
Published: March 2019

The problem of selection by the patch population in the absence of information on the utility of the patch, that is, the volume of its energy resources, is considered. This problem relates to the theory of optimal foraging. U. Dieckman proposed an approach to modeling the population patch distribution. The approach is based on a utility function that takes into account the amount of resources in a patch, the population − patch distance, and the measure of information certainty on patch utility. In this case, the Boltzmann distribution is used to describe the population patch distribution. And U. Dieckman considered a static problem that does not take into account the change in the position of the population with time. In this paper, we propose a dynamic system that describes the population patch distribution, which depends on the utility of the patch. In addition the utility varies with time as a result of distance variations. The Boltzmann distribution is a particular solution of the proposed system of differential equations. The Lyapunov stability condition for the Boltzmann distribution is obtained.The utility functions of the patches, which depend on the population − patch distance and on the measure of the information certainty, are introduced. As a result, in the two-dimensional case, a space R2is divided into areas of preferred utility. Such a partition is a generalization of the Voronoi diagram.
On Optimal Interpolation by Linear Functions on an n-Dimensional Cube
Authors: Nevskii Mikhail V. , Ukhalov Alexey Yu.
Published: March 2019

Let \(n\in{\mathbb N}\), and let \(Q_n\) be the unit cube \([0,1]^n\). By \(C(Q_n)\) we denote the space of continuous functions \(f:Q_n\to{\mathbb R}\) with the norm \(\|f\|_{C(Q_n)}:=\max\limits_{x\in Q_n}|f(x)|,\) by \(\Pi_1\left({\mathbb R}^n\right)\) --- the set of polynomials of \(n\) variables of degree \(\leq 1\) (or linear functions). Let \(x^{(j)},\) \(1\leq j\leq n+1,\) be the vertices of \(n\)-dimnsional nondegenerate simplex \(S\subset Q_n\). An interpolation projector \(P:C(Q_n)\to \Pi_1({\mathbb R}^n)\) corresponding to the simplex \(S\) is defined by equalities \(Pf\left(x^{(j)}\right)= f\left(x^{(j)}\right).\) The norm of \(P\) as an operator from \(C(Q_n)\) to \(C(Q_n)\) may be calculated by the formula \(\|P\|=\max\limits_{x\in ver(Q_n)} \sum\limits_{j=1}^{n+1} |\lambda_j(x)|.\) Here \(\lambda_j\) are the basic Lagrange polynomials with respect to \(S,\) \(ver(Q_n)\) is the set of vertices of \(Q_n\). Let us denote by \(\theta_n\) the minimal possible value of \(\|P\|.\) Earlier, the first author proved various relations and estimates for values \(\|P\|\) and \(\theta_n\), in particular, having geometric character. The equivalence \(\theta_n\asymp \sqrt{n}\) takes place. For example, the appropriate, according to dimension \(n\), inequalities may be written in the form \linebreak \(\frac{1}{4}\sqrt{n}\) \(<\theta_n\) \(<3\sqrt{n}.\) If the nodes of the projector \(P^*\) coincide with vertices of an arbitrary simplex with maximum possible volume, we have \(\|P^*\|\asymp\theta_n.\)When an Hadamard matrix of order \(n+1\) exists, holds \(\theta_n\leq\sqrt{n+1}.\) In the paper, we give more precise upper bounds of numbers \(\theta_n\) for \(21\leq n \leq 26\). These estimates were obtained with the application of maximum volume simplices in the cube. For constructing such simplices, we utilize maximum determinants containing the elements \(\pm 1.\) Also, we systematize and comment the best nowaday upper and low estimates of numbers \(\theta_n\) for a concrete \(n.\)
The Relationship of Husband Role on Psychological Adaptation Levels of Postpartum Mother in Camar1 Arifin Achmad Hospital Riau Province
Authors: Puswati D , Suci A
Published: March 2019

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The Influence of Tofu Pulp Flour Substitution on Protein Content and Acceptability Level of Chicken Nugget
Authors: Dayu Putri V , Nita Y
Published: March 2019

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Processing of Vanadium-containing Converter Slag to Produce Higher-purity Vanadium Pentoxide
Authors: Dmitrievich Khalezov B , Gennadyevich Krasheninin A
Published: March 2019

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Application of the Aluminosilicon Manganese to Obtain Refined Grades of Ferromanganese
Authors: Amangeldiyevich Yessengaliyev D , Omarovich Baisanov S , Zeinullinovich Isagulov A , Sailaubaevich Baisanov A , Vadimovich Zayakin O
Published: March 2019

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Metallothermic Production of Boron-containing Silicon Barium
Authors: Abdulovich Akberdin A , Meiramovich Karbayev M
Published: March 2019

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Method of Changing the Structure of Cast Fe–Al Alloys By Inputting Titanium-containing Modifiers
Authors: Melchakov S Yu , Smirnova V G , Ermakovav V P , Kataev V V , Marshuk L A , Nekrasov I V , Sheshukov O Yu
Published: March 2019

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Stabilization of Self-slaking Slags from Ferroalloy Production
Authors: Vladimirovich Sychev A , Ivanovich Zhuchkov V , Vadimovich Zayakin O
Published: March 2019

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The Using Boron-containing Materials in Ferroalloy Industry
Authors: Kel' I Nikolaevich
Published: March 2019

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Steel Micro-alloying with Boron: A Perspective Direction to Reduce the Consumption of Manganese Ferroalloys
Authors: Babenko A A , Zhuchkov V I , Smirnov L A , Akberdin A A , Upolovnikova A G
Published: March 2019

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The Differences of Consumer Behaviors Towards Merantau Student and Local Student
Authors: Andhika Putra R , Ridwan M , Melmusi Z , Bayu Putra R , Hutari Mulyani S
Published: March 2019

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The Development of Islamic Social Reporting As a Concept of Social Accountability Based on Sharia
Authors: Tri Cahya B , Hanifah U , Marpaung M , Suryani Lubis I
Published: March 2019

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Cultural Expressions of Mananam Padi ‘Planting Rice’ Procession in Minangkabau Society
Authors: Nelfi E , Laili I
Published: March 2019

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Active Learning Training: Shifting the Attention Toward Students’ Active Learning
Authors: Mutiara Hati G , Afriazi R
Published: March 2019

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Flood Risk Reduction Model on Small Medium Enterprises
Authors: Isa M , Mangifera L
Published: March 2019

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The Effect of Non-Monetary Framing Sales Promotion on Customer’s Purchase Intention with Believability of the Deal Offer As Mediation Variables
Authors: . Nurainun , J Ma’Ruf J , Tabrani M , Shabri Abd. Madjid M
Published: March 2019

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Innovation and Knowledge Management System in Creative Industry: A systematic Literature Review Using Metaanalysis
Authors: Mayasari Ginting Y , . Elfindri , Rahman H , Devianto D
Published: March 2019

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Teaching Vocabulary Techniques Through Letterland in Star Kiddy Preschool Semarang
Authors: Istifadah H
Published: March 2019

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Exploratory Factor Analysis Research Instrument Confidence Attitude Toward Students
Authors: . NoAli , Istiyono E , . Supahar
Published: March 2019

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Development of Problem-based Mathematic Learning Model to Increase Students’ Competence
Authors: Amrina Z , Desfitri R , Zuzano F , Wahyuni Y , Hidayati H
Published: March 2019

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Clinical and Biochemical Manifestations of Severe Sickle Cell Anemia in Adult Patients in Steady State in Ile-Ife, Nigeria
Authors: Oluwagbenga Oguntoye Oluwatosin , A. Ndububa Dennis , Musah. Yusuf , A. Bolarinwa Rahman , O. Ayoola Oluwagbemiga
Published: March 2019

Background: There are documented established markers (indices) of disease severity in patients with sickle cell anemia (SCA) and they determine the course of the disease. This study investigated the pattern and prevalence of some of these markers of disease severity in adult patients with SCA in steady state attending the hematology clinic of a federal tertiary teaching hospital in Ile-Ife, Nigeria.
Materials and Methods: This was a descriptive study. Basic demographic data and relevant clinical information was obtained using a well-structured questionnaire and the case files (hospital records) of 50 consecutive SCA (HbSS) patients.
Results: The study group comprised of 21(42%) males and 29(58%) females. The age range was 18–45years with a mean(±SD) of 27.6±7.607. Hepatomegaly(64%), frequent episodes of vaso-occlusive crisis, that is, ≥ 3 episodes per year(30%) and Dactylitis in infanthood(26%) were the most common clinical parameters identified in these patients while a high serum total bilirubin of > 51µmol/L(26%) was the most common laboratory parameter seen in these patients.
Conclusion: Markers of disease severity were identified in the patients with SCA in this study. The presence of these markers in an SCA patient connotes severe disease and they determine the course of the disease. Therefore, there is a need to pay more attention to these patients by following them up more closely.
Peculiarities of the molecular composition of heterochromatin associated with pronucleoli in mouse embryos
Authors: Bogolyubova I. O. , Sailau Z. K. , Bogolyubov D. S.
Published: March 2019

The nucleus of pre-implantation mammalian embryos is characterized by peculiar structural organization. At the initial stages of cleavage, the nucleus of the embryo contains the so-called nucleolus precursor bodies (NPBs) or pronucleoli rather than functionally active nucleoli. The NPBs are fibrillar electron-dense structures inactive in RNA synthesis. The vast majority of NPBs are surrounded by a ring-shaped zone of transcriptionally inactive heterochromatin. Intriguingly, these zones contain not only tri-methylated histone Н3K9me3 as an epigenetic mark of repressed chromatin but also acetylated histone H4K5ac, a well-known marker of active chromatin. Immunocytochemical data suggest that the molecular composition of this ‘ring heterochromatin’ in mouse embryos changes during the realization of embryonic genome activation events, as well as during artificial suppression of transcription. In zygotes, some factors of mRNA biogenesis including splicing factor SC35 (SRSF2) and basal transcription factor TFIID are detectable in the ring chromatin. At later stages of development, other nuclear proteins such as Y14, a core component of the exon-exon junction complex (EJC), as well as the proteins involved in chromatin remodeling (ATRX, Daxx) are also detectable in this area. A typical component of the ‘ring heterochromatin’ is actin. Anti-actin immunocytochemical labeling is most expressed at the two-cell cleavage stage after activation of the embryonic genome. Indicatively, the molecular composition of the ‘ring heterochromatin’ associated with different NPBs may differ significantly even in the same nucleus. This seems to reflect the functional heterogeneity of morphologically similar NPBs according to their competence to the process of nucleologenesis. Here, we discuss briefly some peculiarities of the molecular composition and possible functions of the NPB-associated heterochromatin in mouse early embryos.
The role of aTp-dependent chromatin remodeling factors in chromatin assembly in vivo
Authors: Il’ina Iu. A. , Konev A. Yu.
Published: March 2019

Chromatin assembly is a fundamental process essential for chromosome duplication subsequent to DNA replication. In addition, histone removal and incorporation take place constantly throughout the cell cycle in the course of DNA-utilizing processes, such as transcription, damage repair or recombination. In vitro studies have revealed that nucleosome assembly relies on the combined action of core histone chaperones and ATP-utilizing molecular motor proteins such as ACF or CHD1. Despite extensive biochemical characterization of ATP-dependent chromatin assembly and remodeling factors, it has remained unclear to what extent nucleosome assembly is an ATP-dependent process in vivo. Our original and published data about the functions of ATP-dependent chromatin assembly and remodeling factors clearly demonstrated that these proteins are important for nucleosome assembly and histone exchange in vivo. During male pronucleus reorganization after fertilization CHD1 has a critical role in the genomescale, replication-independent nucleosome assembly involving the histone variant H3.3. Thus, the molecular motor proteins, such as CHD1, function not only in the remodeling of existing nucleosomes but also in de novo nucleosome assembly from DNA and histones in vivo. ATP-dependent chromatin assembly and remodeling factors have been implicated in the process of histone exchange during transcription and DNA repair, in the maintenance of centromeric chromatin and in the loading and remodeling of nucleosomes behind a replication fork. Thus, chromatin remodeling factors are involved in the processes of both replication-dependent and replication-independent chromatin assembly. The role of these proteins is especially prominent in the processes of large-scale chromatin reorganization; for example, during male pronucleus formation or in DNA repair. Together, ATP-dependent chromatin assembly factors, histone chaperones and chromatin modifying enzymes form a “chromatin integrity network” to ensure proper maintenance and propagation of chromatin landscape.
Identification of proteins that can participate in the recruitment of Ttk69 to genomic sites of Drosophila melanogaster
Authors: Osadchiy I. S. , Fedorova T. N. , Georgiev P. G. , Maksimenko O. G.
Published: March 2019

The proteins with the BTB domain play an important role in the processes of activation and repression of transcription. Interestingly, BTB-containing proteins are widely distributed only among higher eukaryotes. Many BTB-containing proteins are transcriptional factors involved in a wide range of developmental processes. One of the key regulators of early development is the BTB-containing protein Ttk (tramtrack), which is able to interact with the Drosophila nucleosome remodeling and histone deacetylation (dNuRD) complex. Ttk69 directly interacts with two protein components of the dNuRD complex, dMi-2 and MEP1. It can be assumed that Ttk69 represses some target genes by remodeling chromatin structure through the recruitment of the dNuRD complex. However, it is still unknown what provides for specific recruitment of Ttk to chromatin in the process of negative/positive regulation of a target gene expression. Although Ttk69 has DNA-binding activity, no extended specific motif has been identified. The purpose of this study was to find proteins that can participate in the recruitment of Ttk to regulatory elements. To identify Ttk partner proteins, screening in the yeast two-hybrid system was performed against a collection of proteins with clusters of C2H2 domains, which bind effectively and specifically to sites on chromatin. As a results, the CG10321 and CG1792 proteins were identified as potential DNA-binding partners of Ttk. We suppose that the CG10321 and CG1792 proteins provide specificity for the recruitment of Ttk and, as a result, of the NuRD-complex to the genome regulatory elements. We found that the Ttk protein is able to interact with the MEP1 and ZnF proteins at once.
Different functions of PHF10 isoforms – subunits of the PBAF chromatin remodeling complex
Authors: Sheynov A. A. , Tatarskiy V. V. , Azieva A. M. , Georgieva S. G. , Soshnikova N. V.
Published: March 2019

Chromatin remodelling multiprotein complexes play an important role in regulation of gene expression in embryogenesis and in the adult organism. Mutations in the subunits of the complexes are often lethal or lead to developmental defects. Complexes consist of core subunits and a specific module. The core consists of ATPase and structure subunits, specific subunits of the module are necessary for chromatin binding. PHF10 (PHD finger protein 10) is a subunit of the PBAF (polybromo-associated BAF) chromatin remodelling complex subfamily. Conserved and highly regulated PHF10 is ubiquitously expressed in mammals as four different isoforms. The isoforms of PHF10 differ by domain structures and posttranslational modifications. All isoforms are highly regulated and included in the PBAF complex in a mutually exclusive manner. Two of the PHF10 isoforms (PHF10-P) are expressed at a high level in neuronal and myeloid progenitors and are necessary for cell proliferation. These isoforms contain PHD (plant homeodomain) fingers for nucleosome binding and recruit RNA polymerase II on the promoters of cell cycle genes. Two other isoforms (PHF10-S) instead of PHD have PDSM (phosphorylation-dependent sumoylation motif), the motif for SUMO1 conjugation. PHF10 is the most unstable subunit of the PBAF complex. Stability can alter the turnover rate of the subunits of the PBAF complex. All PHF10 isoforms are degraded by β-TrCP ubiquitin ligase but PHF10-S isoforms contain a cluster of serins (X-cluster) for multiple phosphorylation by casein kinase I. This phosphorylation protects the β-TrCP degron from β-TrCP recognition and subsequently stabilizes the PHF10-S isoforms. Thus, the incorporation of PHF10 isoforms with different phosphorylation patterns and different stability into the PBAF complexes alters the functions of the entire PBAF complex and determines the range of genes undergoing remodelling.
Non3 is an essential Drosophila gene required for proper nucleolus assembly
Authors: Andreyeva E. N. , Ogienko A. A. , Yushkova A. A. , Popova J. V. , Pavlova G. A. , Kozhevnikova E. N. , Ivankin A. V. , Gatti M. , Pindyurin A. V.
Published: March 2019

The nucleolus is a dynamic non-membrane-bound nuclear organelle, which plays key roles not only in ribosome biogenesis but also in many other cellular processes. Consistent with its multiple functions, the nucleolus has been implicated in many human diseases, including cancer and degenerative pathologies of the nervous system and heart. Here, we report the characterization of the Drosophila Non3 (Novel nucleolar protein 3) gene, which encodes a protein homologous to the human Brix domain-containing Rpf2 that has been shown to control ribosomal RNA (rRNA) processing. We used imprecise P-element excision to generate four new mutant alleles in the Non3 gene. Complementation and phenotypic analyses showed that these Non3 mutations can be arranged in an allelic series that includes both viable and lethal alleles. The strongest lethal allele (Non3∆600) is a genetically null allele that carries a large deletion of the gene and exhibits early lethality when homozygous. Flies heterozygous for Non3∆600 occasionally exhibit a mild reduction in the bristle size, but develop normally and are fertile. However, heteroallelic combinations of viable Non3 mutations (Non3197, Non3310 and Non3259) display a Minute-like phenotype, consisting in delayed development and short and thin bristles, suggesting that they are defective in ribosome biogenesis. We also demonstrate that the Non3 protein localizes to the nucleolus of larval brain cells and it is required for proper nucleolar localization of Fibrillarin, a protein important for post-translational modification and processing of rRNAs. In summary, we generated a number of genetic and biochemical tools that were exploited for an initial characterization of Non3, and will be instrumental for future functional studies on this gene and its protein product.
The study of the regulatory region of the Drosophila melanogaster Notch gene by new methods of directed genome editing
Authors: Andreyenkov O. V. , Volkova E. I. , Andreyenkova N. G. , Demakov S. A.
Published: March 2019

The Notch gene plays a key role in the development of organs and tissues of neuroectodermic origin, including the nervous system. In eukaryotic organisms, the Notch pathway is involved in cell fate determination. The Notch gene was first discovered in Drosophila melanogaster. In mammals, the family of Notch receptors includes four homologues. In humans, mutations in the Notch gene cause several hereditary diseases and carcinogenesis. Studies of the regulatory zone of the Notch gene in D. melanogaster have been conducted for several decades. We review their results and methods. The regulatory zone of the Notch gene is in the region of open chromatin state that corresponds to the 3C6/3C7 interband on the cytological map of polytene chromosomes of D. melanogaster salivary glands. The development of new methods for directed genome editing made it possible to create a system for introducing directed changes into the regulatory zone of the gene. Using the CRISPR/Cas9 system, we obtained a directed 4-kilobase deletion including the 5’-regulatory zone, promoter, and the first exon of the Notch gene and introduced the attP site into the first intron of the Notch gene. This approach enabled targeted changes of the sequence of the regulatory and promoter regions of the gene. Thus, it provided a new powerful tool for studies of Notch gene regulation and the organization of the open chromatin state.
Hypertension in pregnant women: a view from the perspective of the European recommendations 2018
Authors: Shih E. V. , Zhukova О. V. , Ostroumova O. D. , Sharonova S. S. , Karnoukh K. I.
Published: March 2019

The problem of arterial hypertension (HTN) in pregnant women is very important due to its high prevalence and severity of consequences for the mother and fetus. In Russia, hypertension is diagnosed in 5–30% pregnant women, with the increasing trend in the past decades. HTN is a risk factor for complications, both for the mother, the fetus and newborn, so HTN remains the leading cause of maternal, fetal and neonatal mortality. HTN in pregnant women is a signifcant predictor of cardiovascular disease in the future. It is also a social problem considering the increase in the cost of treatment, i.e. related to the repeated hospitalizations after childbirth. In 2018, new European recommendations on cardiovascular diseases during pregnancy and European recommendations on HTN (the latter ones include special sections devoted to hypertension in pregnant women) were published. These recommendations provide the latest data on the classifcation, diagnosis and treatment of HTN in pregnant women. Currently, methyldopa is still the frst-line drug for the treatment of HTN in pregnant women, which has proved to be an effective and safe medication in pregnant women.
Retrospective analysis of the cardiovascular risk factors in hypertensive patients in Mongolia
Authors: Tsetsegdulam B. , Maksikova T. M. , Kalyagin A. N. , Orlova G. M. , Sinkova G. M. , Balabina N. M.
Published: March 2019

The review analyzes the structure of cardiovascular risk factors in patients with hypertension in Mongolia. According to the WHO data from 2014 the prevalence of hypertension in Mongolia is high among men and above medium level among women. In adults (≥ 18 years old), the prevalence of hypertension constituted 28,7% (25,8 % among men and 22,9 % among women), and when adjusted for age it achieved 31,8% (34,8% and 28,8 %, respectively). The most important modifable (non-nutritious food, low physical activity, smoking, alcohol abuse, obesity, hyperglycemia) and non-modifable risk factors of cardiovascular diseases are considered. We perform a comparative analysis of the Mongolian data with the data of the World Health Organization, the Russian Federation and other countries.
INFLUENCE OF SHORT-TERM INSULIN THERAPY ON CONCENTRATION OF VEGF-A FACTOR IN INTRAOCULAR LIQUID IN CASE OF DIABETES ALLOXAN MODEL IN RATS
Authors: Pashtaev N. P , Pozdeyeva N. A , Madyanov I. V , Shkolnik G. S , Gagloev B. V , Krestov D. S , Maksimov A. A
Published: March 2019

Experiment was carried out on 80 mongrel rats in which diabetes was called forth by alloxan monohydrate injection. Experimental animals were divided into 2 groups. In the main group substitutional insulin therapy was begun, in control group animals didn't receive special therapy. In 3 days of insulin therapy experimental animals of both the groups were excluded from investigation for intraocular liquids to be taken in which VEGF-A concentration was determined. We didn't reveal reliable decrease of VEGF-A concentration in intraocular liquid between the groups.
TECHNICAL POSSIBILITIES FOR MINIMIZING THE TRAUMATIC IMPACT OF PHACOEMULSIFICATION OF AGE-RELATED CATARACT ON THE EYES WITH PRIMARY OPEN-ANGLE GLAUCOMA WITH TARGET INTRAOCULAR PRESSURE
Authors: Sorokin E. L , Postupaeva N. V , Postupaev A. V
Published: March 2019

Frequency of recurrences of increase of intraocular pressure (IOP) in postoperative period of phacoemulsification (PE) using our own surgical techniques at combination of primary open-angle glaucoma (POAG) and age-related cataracts was studied. The clinical material consisted of 83 patients (83 eyes) with developed or far-advanced stages of glaucoma, a rigid pupil, a dense nucleus, a lens subluxation of the 1st degree, which had antiglaucomatous operations. The use of our own methods of performing some stages of PE helped to reduced intraoperative trauma and frequency of recurrence of increase of IOP in period of observation to 3 years.
FEMTOASSISTED PHACOEMULSIFICATION OF COMPLICATED CATARACT WITH CORNEAL ASTIGMATISM CORRECTION IN A PATIENT WITH WEILL-MARCHESANI SYNDROME. CLINICAL CASE
Authors: Tereshchenko A. V , Trifanenkova I. G , Ivanov A. M , Okuneva M. V , Timofeev M. A
Published: March 2019

The development of new diagnostic technologies and modern capabilities of high-tech surgery help determine the optimal tactics for treating patients with cataracts complicated by severe defects of the ligamentous apparatus.
ESP Needs Analysis at the Moroccan University: Renewable Energy Engineering Students at EST Fes as a Case Study
Authors: AIT HATTANI Hanae
Published: March 2019

With English becoming the world’s lingua franca and the proliferating scientific and technological advances, English language education has been gradually shifting from its classical applications such as EFL (English as a foreign language) or ESL (English as a second language) toward new paradigms like English for specific purposes (ESP). The most important and problematic question in ESP teaching and learning is whether the course is effective or not. ESP is student-task oriented, thus, measuring its effectiveness is strongly related to measuring learners’ attitudes, needs, expectations, satisfaction, and achievement. For this purpose, this study attempted to investigate ESP needs analysis of Moroccan university students, case study of renewable energy engineering students at the Higher School of Technology (ESTF).  The research was conducted using quantitative surveys d. The data was gathered from 30 undergraduate renewable energy engineering students. The study findings confirmed that the participant students have highly favorable attitudes towards English language for both their personal and professional careers. However, the survey results indicated that these students have some difficulties with English language productive skills, namely speaking and writing, in addition to some other sub-skills. Therefore, this research suggests a reform at the level of ESP teaching and learning curricular, focusing on the incorporation of innovative approached and methods that aims at enhancing students’ language acquisition and competency.
A GRADUAÇÃO EM ENGENHARIA DE PRODUÇÃO DA UNIVERSIDADE FEDERAL DE OURO PRETO: UMA PERSPECTIVA DOS DISCENTES E DOS DOCENTES
Authors: Arantes Maria Teresa , Rodrigues Lasara Fabricia , Silva André Luís
Published: March 2019

Qual é o perfil do discente do curso de Engenharia de Produção? Quais são suas percepções? E quais são as dos docentes? Estas perguntas serviram de base para a elaboração do objetivo deste trabalho, que foi: descrever o perfil e percepções dos discentes e docentes do curso de Engenharia de Produção da Universidade Federal de Ouro Preto (UFOP). Utilizou-se, como metodologia, uma pesquisa direta com um Survey. O recorte do público pesquisado (discentes e docentes da UFOP) se justifica pois não há dados/informação destes. Outros dois pontos que justificam a implementação desta pesquisa é: primeiro, a necessidade de se entender quais atividades mais contribuem para o desempenho deste discentes (na visão deles próprios); segundo, analisar a formação do docente, ambiente de trabalho, e instrumentos didáticos. Como resultado pode-se dizer que os discentes do curso já haviam começado uma outra formação antes de optar pela Engenharia de Produção, porém não conheciam o projeto pedagógico do curso. Outro ponto é a percepção que estes possuem sobre quais atividades dentro da universidade mais contribuem para sua formação, tais como: aulas práticas, empresa júnior dentre outras. Já os docentes, uma boa parte daqueles pesquisados leram e conhecem o projeto pedagógico do curso (mas não todos). Além disso, uma parte considerável deles não tiveram formação em didática do ensino superior.
OTIMIZAÇÃO DE FILAS: UM ESTUDO DE CASO EM SECRETARIA DE COLÉGIO NO RIO DE JANEIRO
Authors: Sucena Marcelo Prado , Chagas Vanessa Cristina Soares
Published: March 2019

Este trabalho avaliou o sistema de filas no processo de atendimento em uma secretaria de um colégio particular, localizado no Rio de Janeiro. Coletaram-se os dados sobre os intervalos dos tempos de chegada de clientes e no atendimento. Realizou-se pesquisa explicativa para se determinar os fatores que influenciaram na formação das filas. A pesquisa exploratória foi utilizada para observar os efeitos que as mudanças de variáveis do estudo poderiam impactar. Desenvolveu-se um estudo piloto para configuração M/M/1 onde foi possível identificar as condições logísticas para coleta de dados do sistema real. Após tal estudo desenvolveu-se o estudo de caso em si, para configuração M/M/C//?/FIFO, registrando a realidade atual do atendimento com duas pessoas. Com os dados do estudo de caso foi possível simular outros cenários com um a quatro servidores. Os resultados obtidos apontam para o cumprimento dos objetivos estipulados pelo empresário com o sistema de filas atual, formado por uma única fila e por dois servidores em paralelo, em que o cliente é atendido assim que o primeiro servidor fica livre. Concluiu-se que só é necessário aumentar a quantidade de servidores caso haja mudança significativa do sistema de fila atual. Entretanto, sugeriu-se desenvolver treinamentos para os dois funcionários, permitindo-se atender de forma mais eficiente, reduzindo as filas.
OS ESPAÇOS DAS MULHERES E DAS MULHERES NEGRAS NO MUNDO DO TRABALHO: UMA REFLEXÃO SOBRE GÊNERO E RAÇA NOS ESTUDOS ORGANIZACIONAIS
Authors: GOuvêa Josiane Barbosa , Dos Santos Gabriela Renata Rodrigues , Paniza Maurício Donavan Rodrigues
Published: March 2019

O presente estudo tem por objetivo compreender, como se deu e se mantém a construção social que indica, ainda que por vezes sutilmente, o lugar das mulheres e da mulher negra no contexto do trabalho. Nosso embasamento teórico aborda o questionamento da universalidade da identidade feminina tendo por apoio o conceito de identidades contingentes. Questionar essa universalidade é pertinente, uma vez que o posicionamento social da mulher é diferenciado quando se interseccionam, além do gênero, raça e classe. Nosso corpo teórico também apresenta reflexões acerca do caráter histórico de marginalidade e exclusão da mulher negra brasileira no mundo do trabalho. Através da revisão bibliográfica e análise de dados secundários foi possível verificar que a segmentação histórica de grupos construídos como dominantes e dominados gera diferenças significativas entre os sujeitos que compõem tais grupos. Falar de gênero é perceber que as mulheres foram historicamente construídas como grupo minoritário e ainda hoje ocupam posições inferiores e, quando nos mesmos cargos, seus rendimentos são significativamente menores do que os dos homens. A situação se acentua ainda mais quando se trata da mulher negra, via de regra relegada a espaços de maior subalternidade, mas que ainda assim resiste no sentido de buscar outros espaços. Como no Brasil ainda há um mecanismo social de exclusão, como o racismo, mulheres brancas e negras ocupam espaços diferenciados, vivem em mundos diferentes. Embora seja válido ressaltar que, conforme mostram os dados secundários do nosso ensaio, tal mecanismo de exclusão não operou ou opera apenas no que diz respeito à construção do mercado de trabalho ou ao campo empresarial, mas reflete uma fratura macro contextual que representa o abismo social ainda existente entre mulheres brancas e negras em particular e entre brancos e negros, em geral, na própria sociedade brasileira.
Georadar vibration-acoustic technology for express-control of road pavement strength and results of its application
Authors: Li Zhongyu , Aliakseyeu Yury , Zhang Qing , Bubulis Algimantas , Minchenya Vladimir , Shi Jicun , Romanov Anatoly , Khadasevich Aliaksandr , Charnabai Ivan
Published: March 2019

The technique of determining the pavement layers strength are given. The results of a field (on the road) testing of asphalt concrete Highway pavement using georadar vibration-acoustic set of equipment are presented. The hardware complex is proved and developed for the automobile roads express-control. Functioning of hardware complex and technique for pavement layer durability definition are described. The ways of the further perfection for the georadar vibrating-acoustic technology are considered.
Stress distribution in masonry infills connected with stiff and flexible interface
Authors: Akyıldız A. Tuğrul , Kowalska-Koczwara Alicja , Kwiecień Arkadiusz
Published: March 2019

Masonry infills are largely used in RC structures for various purposes, and in seismic zones, they are also preferred for providing earthquake resistant systems. However, due to the rigid connection between infills and RC frames, these systems are vulnerable when large deformations are demanded. Cyclic loads that are occurring during seismic excitations cause stress concentration level to increase, particularly in frame-infill contact zones. As a result of stress increment, infill panels get weaker in terms of both in-plane and out-of-plane resistance. These drawbacks cause loss of lives and properties, thus affecting governments and societies adversely. In order to overcome this obstacle, an innovative solution is proposed which uses flexible polymers (Polyurethane PM) as joint elements for protecting the structural elements. The research is focused on numerical analyses of three types of frames with masonry infills, which are excited through both in-plane and out-of-plane directions by different earthquake records. Infill walls are connected to the frames in three manners: stiffly (classical approach), with flexible joints at 3-boundaries and with flexible joints at 4-boundaries. Differences in calculated stress distribution as well as some other linear and non-linear results are presented and discussed. The primary results give promising outcomes that this new method might be used in seismic zones for protecting structures.
Theoretical analysis of the Influence of workpiece spindle vibration displacement on machining accuracy of gear hobbing machine
Authors: Yang Yong , Li Xianguang , Zou Zheng , Zeng Lingwan , Wang Li
Published: March 2019

In order to study the vibration characteristics of the workpiece spindle of a gear hobbing machine, this paper established a mathematical model for the workpiece spindle vibration displacement in the x-axis direction. To verify the reliability of the proposed model, a series of experiments were run on the CNC gear hobbing machine. The relative error between the experimental data and the calculated values was lower than 5 %, which proves that our proposed mathematical model is qualified to be a research tool for the investigation of the variation law of the workpiece spindle. According to the analysis results, the workpiece spindle vibration displacement literally decreases with the increasing order, and the hobbing process with high hob revolution speed and small cutting depth is preferable for gear hobbing accuracy.
An incipient fault diagnosis method for rotating machinery based on bilateral spectrum and precession energy difference density spectrum
Authors: Gu Zhenyu , Zhu Xuelian , Zeng Yuan , Ma Tiedong
Published: March 2019

As an important characteristic information in incipient fault diagnosis of rotating machinery, the fault impulse signal is hard to be monitored due to the low signal amplitude and system disturbance/noise. Based on bilateral spectrum and precession energy difference density spectrum for the incipient fault diagnosis of rotating machinery, a novel diagnosis method is proposed in this paper to overcome this key problem. Compared with the existing methods to extract transient impulses from the vibrate signals, this paper designs a new fault feature parameter-precession energy difference density to characterize the feature of transient impulse. Furthermore, the complex signal and the negative frequency are introduced into the spectrum analysis and the forward and backward precession characteristics, which can be directly gained through the bilateral spectrum and relieves the problems not to be overlooked, such as high calculation, high error and time consuming. Finally, the feasibility and effectiveness of the proposed methods are demonstrated via a case study of a vertical mill reducer.
Launching dynamic analysis for tank on the move based on dynamic simulation
Authors: Chen Yu , Yang Guolai , Sun Quanzhao
Published: March 2019

Achieving high firing accuracy of tank on the move is challenging. For improving firing accuracy, better understanding launching dynamic behavior of tank firing on the move is required. This study established a rigid-flexible coupling dynamic model of tank firing on the move. Thereinto, the barrel flexibility was considered based on the FFlex body technology, and the contact-impact algorithm was used to describe the projectile-barrel interaction. With the sinusoid superposition method, a three-dimensional road surface spectrum file considering the coherence of left and right tracks was created. Based on the results obtained in simulation, this study discussed the dynamic behaviors of a tank gun system such as the barrel curvature and the influence of projectile-barrel interaction on firing accuracy of tank firing on the move, in which the factors including projectile type, driving speed and road roughness were taken into consideration. The results indicated that the barrel curvature and the muzzle vibration do not increase simply with the increase of road roughness and driving speed as common sense.
A fault feature extraction method for single-channel signal of rotary machinery based on VMD and KICA
Authors: Sun Hongchun , Fang Liang , Zhao Feng
Published: March 2019

A feature extraction method combined with variational mode decomposition (VMD) and kernel independent component analysis (KICA) is proposed to improve the fault feature extraction of vibration signal of rotary machinery. Firstly, VMD is used to decompose the single-channel vibration signal. Secondly, calculate the correlation coefficient between each component and the original signal. Finally, a new multidimensional observation signal is formed with high correlation components, and the fault signals will be extracted from the new observation signal by KICA. Compared with some typical fault feature extraction methods, the better performance of the proposed method is demonstrated by two experiments which are faulty rolling bearing experiment and a comprehensive experiment with faulty rolling bearing and faulty gear. Furthermore, an experiment of faulty rotary shaft verifies the effectiveness of this method. The results demonstrate that the proposed method is efficient for fault feature extraction of single-channel vibration signal of rotary machinery.
Self-synchronization features of inertial vibration exciters in two-mass system
Authors: Panovko Grigory , Shokhin Alexander
Published: March 2019

The paper presents the results of experimental analysis features of rotation of two unbalance vibration exciters that excite oscillations of a chain-type two-mass oscillatory system in order to identify stability of synchronous modes of the debalances rotation near the system resonances (in application to analysis of resonant vibrating machines dynamics). Experimentally obtained amplitude-frequency characteristics of the model, velocities and mutual phase shift of rotation of the debalances are analyzed. Areas of stable synchronous rotation of the debalances and types of their self-synchronization are revealed as dependence of both the frequency of voltage supplying to the electric motors and the imbalances value. It is shown that when approaching the resonant frequencies, both the debalances rotational speeds and their mutual phasing appear to be unstable.
Investigation of the model for transient beating phenomenon in symmetric structures with Braille elements
Authors: Kibirkštis E. , Voloshin A. , Vaitasius K. , Pyr’yev J. , Venytė I. , Havenko S. , Ragulskis K. , Ragulskis L.
Published: March 2019

Results of experimental investigations of vibrations of a circular plate under impact loading are presented. In such structures when there are small defects causing non-symmetry, such as Braille elements, transient beating phenomenon is observed. Simplified mathematical model for the investigation of this experimentally determined transient beating phenomenon is proposed and numerical results based on this model are obtained and investigated. From the presented results qualities of the envelope function in the investigated transient beating phenomenon are determined.
A study on determining the maintenance task interval of the flight trainer aircraft system
Authors: Shi Xiangyang
Published: March 2019

To formulate a plan of maintenance, the key aspect is to determine the maintenance intervals, as the maintenance types and maintenance intervals of each system are provided in the maintenance plan, and the types of each system are usually fixed. In this paper, the using data of aircraft components was employed to determine the maintenance interval. The least-squares method was adopted to estimate the Weibull distribution parameter. Then, the maintenance task interval model was set up. At last, the method was verified by using the reliability data of landing gear in in CESSNA172R.
Research on fault diagnosis of B737 aircraft fuel system based on improved BP neural network
Authors: Xiangyang Shi
Published: March 2019

In this paper, an improved BP neural network algorithm is applied to the fault diagnosis of aircraft fuel system. The simulation results show that the algorithm has the characteristics of fast diagnosis speed and low misdiagnosis rate, and lays a foundation for the development of aircraft fuel fault diagnosis expert system based on neural network.
Facades for Achieving Visual Comfort: High Performance Computing
Authors: Belok Fatima , Rabea Mostafa , Hanafi Mohamed , El Bastawissi Ibtihal
Published: March 2019

Within the last few decades, many digital technologies have been integrated to the field of architecture. This in turn has developed a number of architectural trends based on these revolutionary changes. Kinetic skin is one of these trends that is directly related to visual performance and comfort, an important aspect. The feeling of comfort is related to the sense organs network; i.e. the eyes, ears, nose, tactile sensors, heat sensors and brain. Visual sensation is the most dominant one in human perception since the eye contains two thirds of the nerve fibers within human central nervous system.The use of kinetic facades for achieving visual comfort in spaces has been recently the subject of many researches, where various aspects have been explored. However, this paper will attempt to review these researches while identifying gaps and potential for future research.
First Record of leucism in Tropidurus hispidus (Spix, 1825) (Squamata: Tropiduridae) in north Brazil, Eastern Amazon
Authors: Sanches Patrick R. , Dos Santos Fillipe P. , Costa-Campos Carlos Eduardo
Published: March 2019

In vertebrates leucism does not occur frequently in nature but has been recorded in amphibians and reptiles. Herein we report the first record of leucism in Tropidurus hispidus from north Brazil, Eastern Amazon. During fieldwork in an amphibian and reptile assessment, we photographed on a rocky surface and leaf litter an individual T. hispidus with leucism.
Impacts of chronic wasting disease on a low density mule deer (Odocoileus hemionus) population in the San Andres Mountains, Chihuahuan Desert, New Mexico
Authors: Bender Louis C. , Rodden Cristina L. , Mathis Pat , Weisenberger Mara E. , Rosas-Rosas Octavio C. , Morrow Patrick C. , Hoenes Brock D.
Published: March 2019

Chronic wasting disease (CWD), a contagious neurodegenerative disease of cervids, is becoming increasingly prevalent in the arid Southwest including the Chihuahuan Desert ecoregion. Population effects of CWD are uncertain, particularly in arid environments, as previous work has been on relatively high density deer populations in semi-arid or temperate environments. In 2002, CWD was detected in a low density mule deer (Odocoileus hemionus) population in the arid San Andres Mountains, a Chihuahuan Desert range in southern New Mexico. We determined prevalence and distribution of CWD, and mortality and movements of deer, to assess the potential impact on low density deer populations in arid environments. Repeated seasonal primarily ante-mortem sampling found stable prevalence of 0.000–0.091, 2003–2008. Annual CWD mortality rate was <0.02, including deer that were culled. Monitoring of adult radio-collared deer showed no dispersal movements away from home ranges, with maximum movements of ≤20 km; similarly, no juveniles dispersed from maternal ranges. Distribution of infected deer was strongly related to presence of other infected deer. Annual survival rates of mule deer and population rate-of-increase suggested little effect of CWD on population-level mortality given observed prevalence. Transmission and reservoirs of CWD in the SAM were likely limited by low deer densities, patchy distribution, and environmental characteristics (i.e., low clay content of soils) unfavorable to prion persistence, characteristics that are typical of most mule deer populations in the Chihuahuan Desert ecoregion.