bluuebunny/crossref_metadata_2025 huggingface dataset:
Dye-fixing performances of slightly crosslinked poly(dimethyldiallylammonium chlorides) on cotton fabric
Authors: Yu Yikai , Zhang Yuejun
Published: December 2019

Slightly cross-linked poly (dimethyldiallylammonium chlorides) (PDMDAACs) with different molecular weights characterized by intrinsic viscosities and structures were prepared as copolymers of triallylmethylammonium chloride (TAMAC), a cross-linking monomer, with dimethyldiallylammonium chloride (DMDAAC). They were then studied as novel, promising reactive polycationic dye-fixatives on cotton fabric. A series of slightly cross-linked PDMDAACs with controlled 1%–5% molar ratios of crosslinking units (TAMAC units) in the main chains and intrinsic viscosities of 0.04~0.86 dL/g were used to treat cotton fabrics dyed with anionic dyes such as Reactive Scarlet 3BS and Reactive Brilliant Blue KNR. Their dye-fixing performance, evaluated by dry rubbing fastness, wet rubbing fastness, colour fastness to soaping, and white fabric staining, were examined. The results showed their dye-fixing performances were affected by their intrinsic viscosities and the molar content of TAMAC units; slightly cross-linked PDMDAACs with intrinsic viscosities of 0.16-0.30 dL/g and 1% TAMAC exhibited the best dye-fixing performances and were better than all members of a group of selected widely-used commercial polycationic dye-fixatives. This was attributed to their plane-like structures and the nice balance between structure and intrinsic viscosities. Thus it was confirmed that the selected slightly cross-linked PDMDAACs can be used as novel dye-fixatives on cotton fabric.
Solid phase extraction and preconcentration of Ni(II) using 1-(2-pyridylazo)-2-naphthol) (PAN) modified β-cyclodextrin butanediol diglycidyl ether polymer as a solid phase extractant
Authors: Jaggi Sandeep , Gupta Usha
Published: December 2019

A sensitive, simple and selective preconcentration method was developed for the preconcentration of trace amounts of Ni(II) ions using 1-(2-pyridylazo)-2-naphthol (PAN) modified β-cyclodextrin butanediol diglycidyl ether polymer as a solid phase extractant. Potential factors affecting the sorption of Ni(II) were investigated. Meanwhile, the optimum conditions were established. The sorbed Ni(II) was eluted using 5 ml of 2 M HCl. The preconcentrtion factor was 70. The detection limit for Ni(II) was 1.18 ng/ml. The relative standard deviation (RSD %) was >1%. The developed method was successfully applied for the determination of trace Ni(II) in different water and potato chip samples as well as reference alloy samples.
The Essentiality of Dynamic Interfaces in Human-Environment Interactions
Authors: Arora Manish , Giuliani Alessandro , Curtin Paul
Published: December 2019

The environment impacts human health in profound ways, yet few theories define the form of the relationship between human physiology and the environment. Under current epidemiological constructs of causation, it is assumed that two complex systems (environment and humans) can transfer information directly. This is the underlying structure of the relationship when studies examine, for example, air pollution and brain health. In marked contrast, we conjecture that complex systems cannot interact directly, but rather such interaction requires the formation of an “interface”. Further, we contend that this dynamic, process-based interface incorporates components from all the interacting systems but exhibits operational independence. This property has many consequences, the foremost being that characteristics of the interface cannot be fully resolved by only studying the systems involved in the interaction. The interface itself must be the subject of inquiry. Without refocusing our attention on biodynamic interfaces, we cannot discern how our environment impacts health.
Advances of Relativity Theory
Authors: Srecko Amrit
Published: December 2019

In this article, a bijective research methodology is applied where every element in the model corresponds to exactly one element in physical reality. An element in the physical reality X and the corresponding element in the model Y are related by the bijective function. A bijective research methodology confirms that the Lorentz factor has its origin in the variable density of universal space. A lower value of the space density corresponds to the higher value of the Lorentz factor. Universal space is not “empty”; space is the primordial energy of the universe. Universal space is the absolute frame of reference for all observers as confirmed experimentally by the GPS system, which demonstrates that the relative rate of clocks is valid for all observers. A planet's perihelion precession and the Sagnac effect are the results of the space rotation.
Psychological Wellbeing in Adolescents with Leukaemia: A Comparative Study with Typical Development Peers
Authors: Tremolada Marta , Taverna Livia , Chiavetta Ilaria Tamara , Bonichini Sabrina , Putti Maria Caterina , Biffi Alessandra
Published: December 2019

There is still little research on psychological wellbeing, life satisfaction and reported problems in preadolescents and adolescents under therapy for leukaemia, and also little research comparing them with their healthy peers. The present study aims to analyse the life satisfaction, hope, psychological wellbeing and reported problems’ intensity in patients aged 8-18 during the first year of therapy, to identify those more at risk and to compare their reports with matched healthy peers. After the parental written consent signature, a battery of self-reported questionnaires was administered during hospitalisation or day hospital admissions post 6 months and post 12 months from the diagnosis. Younger patients (aged 8–13 years) were more at risk than older ones in their problems’ intensity and psychological symptoms; females and Acute Myeloid Leukaemia patients reported lower current life satisfaction perceptions; hope was associated with lower depression symptoms and mood problems. Healthy peers have a better perception of current life, but reported a lower hope score, more anxiety symptoms and more cognitive problems than patients. The first 6 months were more critical for patients’ psychological health. The clinical aim was to identify the patients more at risk in order to prepare ad hoc psychological interventions.
Physical Scaling Predicts Oil Production Rates and Ultimate Recovery from All Horizontal Wells in the Bakken Shale
Authors: Saputra Wardana , Kirati Wissem , Patzek Tadeusz
Published: December 2019

A recent study by the Wall Street Journal reveals that the hydrofractured horizontal wells in shales have been producing less than forecasted by the industry with the empirical hyperbolic decline curve analysis (DCA). As an alternative to DCA, we introduce a simple, fast and accurate method of estimating ultimate recovery (EUR) in oil shales. We adopt a physics-based scaling approach to analyze oil rates and ultimate recovery from 14,888 active horizontal oil wells in the Bakken shale. To predict EUR, we collapse production records from individual horizontal shale oil wells onto two segments of a master curve: (1) We find that cumulative oil production from 4,845 wells is still growing linearly with the square root of time; and (2) 6,401 wells are already in exponential decline after approximately seven years on production. In addition, 2,363 wells have discontinuous production records, because of refracturing or changes in downhole flowing pressure, and are matched with a linear combination of scaling curves superposed in time. The remaining 1,279 new wells with less than 12 months on production have too few production records to allow for robust matches. These wells are scaled with the slopes of other comparable wells in the square-root-of-time flow regime. In the end, we predict that total ultimate recovery from all existing horizontal wells in Bakken will be some 4.5 billion barrels of oil. We also find that wells completed in the Middle Bakken formation, in general, produce more oil than those completed in the Upper Three Forks formation. The newly completed longer wells with larger hydrofractures have higher initial production rates, but they decline faster and have EURs similar to the cheaper old wells. There is little correlation among EUR, lateral length, and the number and size of hydrofractures. Therefore, technology may not help much in boosting production of new wells completed in the poor immature areas along the edges of the Williston Basin. Operators and policy-makers may use our findings to optimize the possible futures of the Bakken shale and other plays. More importantly, petroleum industry may adopt our physics-based method as an alternative to the overly-optimistic hyperbolic DCA that yields an "illusory picture" of shale oil resources.
Synergistic Effects of Mild Heating and Dielectric Barrier Discharge Plasma on Reduction of Bacillus cereus in Red Pepper Powder
Authors: Jeon Eun Bi , Choi Man-Seok , Kim Ji Yoon , Park Shin Young
Published: December 2019

The synergistic efficacy of combined treatment mild heat (MH) and dielectric barrier discharge (DBD) plasma in Bacillus cereus-contaminated red pepper powder was tested. A cocktail of three strains of B. cereus (NCCP 10623, NCCP 14579, ATCC 11778) was inoculated onto red pepper powder and then treated with MH (60 ℃ for 5-20 min) and DBD plasma (5-20 min). Treatment with MH and DBD plasma alone for 5~20 min resulted in reductions of 0.23~1.43 and 0.12~0.96 log CFU/g, respectively. Combined treatment with MH and DBD plasma was the most effective at reducing B. cereus counts on red pepper powder and resulted in log-reductions of ≥ 6.0 log CFU/g. The largest synergistic values (4.24-4.42 log) against B. cereus in red pepper powder were obtained by the combination of 20 min MH and 5~15 min DBD plasma. Hunter color ‘‘L’’, ‘‘a’’, and ‘‘b’’ values of the combination-treated samples were not significantly different from those of non-treated samples. Also, no significant (p > 0.05) differences in pH values between samples were observed. Therefore, these results suggest that the combination of MH treatment and DBD plasma can be potentially utilized in the food industry to effectively inactivate B. cereus without incurring quality deterioration of red pepper powder.
An Overview of Emergent Order in Far-from-Equilibrium Driven Systems: From Kuramoto Oscillators to Rayleigh-Bénard Convection
Authors: Chatterjee Atanu , Mears Nicholas , Yadati Yash , Iannacchione Germano
Published: December 2019

Soft-matter systems when driven out-of-equilibrium often give rise to structures that usually lie in-between the macroscopic scale of the material and microscopic scale of its constituents. In this paper we review three such systems, the two-dimensional square-lattice Ising model, the Kuramoto model and the Rayeligh-Bénard convection system which when driven out-of-equilibrium give rise to emergent spatio-temporal order through self-organization. A common feature of these systems is that the entities that self-assemble are coupled to one another in some way, either through local interactions or through a continuous media. Therefore, the general nature of non-equilibrium fluctuations of the intrinsic variables in these systems are found to follow similar trends as order emerges. Through this paper, we attempt to look for connections between among these systems and systems in general which give rise to emergent order when driven out-of-equilibrium.
Safety and Efficacy of Treating Symptomatic, Partial-Thickness Rotator Cuff Tear with Fresh, Uncultured, Unmodified, Autologous Adipose Derived Regenerative Cells (UA-ADRCs) Isolated at Point of Care: A Prospective, Randomized, Controlled First-in-Human Pilot Study
Authors: Hurd Jason L. , Facile Tiffany F. , Weiss Jennifer , Hayes Matthew , Hayes Meredith , Furia John P. , Maffulli Nicola , Winnier Glenn E. , Alt Christopher , Schmitz Christoph , Alt Eckhard U. , Lundeen Mark A.
Published: December 2019

Background: This study tested the hypothesis that treatment of symptomatic, partial-thickness rotator cuff tear (sPTRCT) with fresh, uncultured, unmodified, autologous adipose derived regenerative cells (UA-ADRCs) isolated from lipoaspirate at point of care is safe and more effective than corticosteroid injection. Methods: Subjects aged between 30 and 75 years with sPTRCT who did not respond to traditional nonoperative care for at least six weeks were randomly assigned to receive a single injection of an average 11.4×106 UA-ADRCs (in 5 ml liquid; mean cell viability: 88%) (n=11; modified intention-to-treat (mITT) population) or a single injection of 80 mg of methylprednisolone (40 mg/ml; 2 ml) plus 3 ml of 0.25% bupivacaine (n=5; mITT population), respectively. Safety and efficacy were assessed using the American Shoulder and Elbow Surgeons Standardized Shoulder Assessment Form (ASES), RAND Short Form-36 Health Survey and pain visual analogue scale (VAS) at baseline (BL) as well as 3 weeks (W3), W6, W9, W12, W24, W32, W40 and W52 post treatment. Fat-saturated T2 weighted magnetic resonance imaging of the shoulder was performed at BL as well as at W24 and W52 post treatment. Results: No severe adverse events related to the injection of UA-ADRCs were observed in the twelve months post treatment. The risks connected with treatment of sPTRCT with UA-ADRCs were not greater than those connected with treatment of sPTRCT with corticosteroid injection. Subjects in the UA-ADRCs group showed statistically significantly higher mean ASES total scores at W24 and W52 post treatment than subjects in the corticosteroid group (p < 0.05). Discussion: Injection of fresh, uncultured, unmodified, autologous adipose derived regenerative cells is a safe and effective treatment of sPTRCT. Larger trials are needed to verify this result. Trial registration: Clinicaltrials.gov ID NCT02918136. Registered September 28, 2016. Level of evidence: Level I; prospective, randomized, controlled trial.
Efek Kerja Bersepada Statis selama 45 Menit terhadap Penurunan Kadar Low Density Lipoprotein dalam Darah pada Mahasiswa 2011 Program Studi Ilmu Keolahragaan Universitas Negeri Jakarta
Authors: Ratna Tri Astri , Junaidi Junaidi , Setiakarnawijaya Yasep
Published: December 2019

Abstrak: Penelitian skripsi ini bertujuan untuk mengetahui efek kerja bersepeda statis 45 menit terhadap   penurunan   kadar    Low   Density Lipoprotein dalam darah pada mahasiswa 2011 Program Studi Ilmu Keolahragaan Universitas Negeri Jakarta. Penelitian  ini  dilaksanakan  di  laboratorium  Somatokinetika  FIK UNJ,  pada tanggal  12  Desember 2012.  Metode  yang  digunakan adalah eksperimen dengan â€œone group pretest-posttest designâ€. Teknik pengambilan sampel menggunakan teknik purposive sampling. Sampel berjumlah 10 orang dari jumlah keseluruhan populasi 30 orang. Instrumen yang digunakan adalah Cabasmira. Teknik analisis data yang digunakan adalah statistik uji-t. Hasil perhitungan kadar low density lipoprotein awal dan akhir setelah melakukan kerja bersepeda statis diperoleh nilai selisih rata-rata (MD) 3,7 dengan nilai perbedaan standar deviasi difference (SDD) 4,81 dan nilai perbedaan standar kesalahan mean (SEMD) 1,60. Hipotesis statistik untuk tes akhir kelompok Ho ditolak jika th â‰¥ tt dan Ho diterima jika th < tt. Hasil perhitungan diperoleh  th  atau  thitung sebesar 2,31 dan nilai tt atau ttabel  sebesar 2,26 dengan taraf signifikan 5%. Dengan demikian th â‰¥ tt maka hipotesis nihil ditolak dan hipotesis kerja diterima.

Kata Kunci : Efek kerja, Sepeda statis, low density lipoprotein.
Тезис Пирса: логический анализ и онтологические следствия
Authors: Шалак Владимир Иванович
Published: December 2019

Ч.С. Пирс выдвинул гипотезу о том, что любые отношения могут быть редуцированы к отношениям, местность которых не превышает трех. Эта гипотеза тесно связана с базовыми категориями его феноменологии.

В данной публикации дан семантический анализ и подробное доказательство следующих двух результатов.

1. Любая первопорядковая теория может быть представлена в языке, содержащем конечный набор одноместных функциональных символов. Философски важным следствием этого является равноправие реляционных и функциональных языков и соответствующих им онтологий.

2. Любая первопорядковая теория может быть представлена в языке, содержащем единственный трехместный предикатный символ $ U $ и конечный набор индивидных констант. Это подтверждает гипотезу Пирса о фундаментальной роли, которую играют трехместные отношения. Язык, дескриптивные символы которого содержат лишь индивидные константы и единственный трехместный предикат, оказывается универсальным языком для представления любых теорий первого порядка.

Имеется структурное сходство трехместного предиката $ U(e,u,x) $ и трехместного предиката $ UM(e,u,x) $, представляющего универсальную машину Тьюринга. И тот и другой можно рассматривать как контейнеры одноместных функций. С этой точки зрения предикат $ U $ является расширением предиката $ UM $ на любые, а не только эффективно вычислимые функции.

Доказанные теоремы заставляют по-новому взглянуть на многие физические теории. В теории относительности фундаментальной структурой считается четырехмерное пространство-время Минковского, которое можно представить в виде четырехместного предиката $ S(x,y,z,t) $. Из теоремы о существовании предиката $ U(e,u,x) $ следует, что четырехмерное пространство-время Минковского не является фундаментальной физической структурой, поскольку может быть редуцировано к единственному трехместному отношению.
Arithmetics based on computability logic
Authors: Japaridze Giorgi
Published: December 2019

This paper is a brief survey of number theories based on em computability logic (CoL) a game-semantically conceived logic of computational tasks of resources. Such theories, termed em clarithmetics, are conservative extensions of first-order Peano arithmetic.

The first section of the paper lays out the conceptual basis of CoL and describes the relevant fragment of its formal language, with so called parallel connectives, choice connectives and quantifiers, and blind quantifiers. Both syntactically and semantically, this is a conservative generalization of the language of classical logic.

Clarithmetics, based on the corresponding fragment of CoL in the same sense as Peano

arithmetic is based on classical logic, are discussed in the second section. The axioms and inference rules of the system of clarithmetic named ${\bf CLA11}$ are presented, and the main results on this system are stated: constructive soundness, extensional completeness, and intensional completeness.

In the final section two potential applications of clarithmetics are addressed: clarithmetics as declarative programming languages in an extreme sense, and as tools for separating computational complexity classes. When clarithmetics or similar CoL-based theories are viewed as programming languages, programming reduces to proof-search, as programs can be mechanically extracted from proofs; such programs also serves as their own formal verifications, thus fully neutralizing the notorious (and generally undecidable) program verification problem. The second application reduces the problem of separating various computational complexity classes to separating the corresponding versions of clarithmetic, the potential benefits of which stem from the belief that separating theories should generally be easier than separating complexity classes directly.
Effects of Different Growing Media on Plant Growth and Nutrient Contents of Petunia (Petunia hybrida)
Authors: GÜLSER Füsun , Çığ Arzu , GÖKKAYA Tuğba Hasibe , ATMACA Hayri
Published: December 2019

The objective of this study was to investigate the effects of different growing media on plant growth and nutrient contents of petunia (Petunia hybrida). The experiment was conducted in a chamber room under controlled conditions at the laboratory. Seven different media (soil, 3:1 soil: peat (P1), 2:1 soil: peat (P2), 3:1 soil: barnyard manure (BYM1), 2:1 soil: barnyard manure (BYM2), 3:1 soil: sugar beet pulp (SBP1), 2:1 soil: sugar beet pulp (SBP2)) were used as plant growing media. The experiment was ended after three months following transplanting of seedlings. Plant growth and flower parameters and macro-micro nutrient contents were determined in harvested plants. The highest stem diameter, branch number, flower diameter, flower stalk diameter, plant fresh weight and plant dry weight were in 2:1 ratio of soil: peat mixture as 7.00 mm, 6.33, 8.91 cm, 3.59 mm, 48.47 g and 4.52 g while the highest plant lenght, lateral branch number and flower number means were found as 27.43 cm, 24.67 and 24.67 in ratio of 3:1 soil: peat growing media respectively. The highest potassium, magnesium and zinc means of plants were obtained as 6.6%, 2.2% and 32.50 mg kg-1 in soil: barnyard manure (2:1) growing media while the highest phosphorus and calcium means of plants were found as 0.27% and 4.5% in soil and peat growing media respectively. The highest iron and copper means of plants were determined as 231 mg kg-1 and 32.50 mg kg-1 in ratios of 2:1 and 3:1 of soil: sugarbeet pulp growing media respectively.
Monosodium Glutamate Plus Artemether-lumefantrine Overdose Altered Malondialdehyde, Total Protein and Albumin Concentration in Rats
Authors: Egbuonu Anthony Cemaluk Chinedum , Obi Emmanuel , Nwuke Chinedu P , Simon Cynthia Uchechi , Oleghibe Justina Utodinachi , Ezenwafor Nnaemeka Raymond , Chukwu Ebere Mercy
Published: December 2019

This study aimed at assessing alterations in malondialdehyde, MDA, total protein and albumin concentration in the serum and liver homogenate of monosodium glutamate (MSG)-challenged rats co-treated with artemether-lumefantrine, AL. Methods involving colourimetric estimation were employed in thirty rats randomly grouped into six (n = 5) and for seven consecutive days, fed feed and water (Group A), AL therapeutic dose (Group B), AL overdose (therapeutic dose × 5) (Group C), MSG (8000 mg/kg body weight) (Group D), AL therapeutic dose plus MSG (Group E) or AL overdose plus MSG (Group F). Total protein concentration (2.64±0.09 g/dL, 2.81±0.14g/dL, respectively) in the liver homogenate of rats exposed to MSG (group D) or MSG plus AL overdose (group F) and malondialdehyde concentration in the liver homogenate of MSG plus AL overdose-fed rats (0.45±0.04 mg/ml) lowered (P<0.05) as against other groups. However, serum albumin concentration in MSG (2.59±0.13 g/dl) or AL overdose plus MSG (3.24±0.12 g/dl) fed rats was higher (P<0.05) compared to the control (2.02±0.04 g/dl). The Total protein: Albumin ratio lowered while the Albumin: total protein ratio increased in rats in MSG, AL overdose plus MSG or AL overdose groups compared with the control. Thus, the apparent MSG plus AL overdose-induced adverse influence on the studied parameters and samples of non-malarial infested rats could be via compromised liver-mediated protein metabolism capacity and bio-functions following possibly enhanced protein-malondialdehyde adduct formation in the rats.
Herbalists and their Mode of Health Care Service Delivery in Debre Markos Town, Northwest Ethiopia
Authors: Taha Eliyas , Woldeyohannes Mindaye Shimekit
Published: December 2019

The administration of medicinal plants for treating human ailments is an age-old practice. Although several studies have been conducted, most of them focused on documentation of the medicinal plants and herbal knowledge. This study investigated why people use herbal medicine, from what conviction, and explains how the plants are collected, prepared and put to purpose. In order to get deeper information about the issue, both primary and secondary sources are consulted. Observation, semi structured interviews, and key informant interviews were used to collect the primary data.15 herbalists were used as informants to obtain information on knowledge acquisition, plant collection, drug preparation, preservation and administration. The study found that healers got the wisdom of herbal medicine from family; friends or relatives; as gift of God; and religious books. The study also uncovered that people visit herbal healers because of cost, cultural acceptability, easy accessibility, and dissatisfaction with modern medicine. Herbal healers are providing health services for a huge segment of the populations’ in spite of several challenges. Dominance of biomedicine, proliferation of quack healers, inheritance problems, absence of support from government authorities, and deforestation stand out as the major challenges for the progress and the very existence of indigenous medicine in general and herbal healers in particular.
He’s Multiple-Scale Solution for the Three-dimensional Nonlinear KH Instability of Rotating Magnetic Fluids
Authors: El-Dib Yusry Osman , Mady Amal A
Published: December 2019

This paper elucidates a trend in solving nonlinear oscillators of the rotating Kelvin-Helmholtz instability. The system is constituted by the vertical flux or the horizontal flux. He’s multiple-scales perturbation methodology has been applied and therefore the system is represented by a generalized homotopy equation. This approach ends up in a periodic answer to a nonlinear oscillator with high nonlinearity. The cubic-quintic nonlinear Duffing equation is obligatory as a condition to uniformly answer. This equation is employed to derive the stability criteria. The transition curves are plotted to investigate the stability image. It's shown that the angular velocity suppresses the instability. The tangential flux plays a helpful role, whereas the vertical field encompasses a destabilizing influence. Within the existence of the rotation, the velocity ratio reduces stability configuration.
Methodology for developing an intelligent user interface for educational publications in the e-learning system
Authors: Pushkar Oleksandr , Hrabovskyi Yevhen
Published: December 2019

The article analyzes special features and principles of constructing the user interface and substantiates the authors methodical approach to the development of the intellectual user interface of educational publications in the e-learning system. Besides, the “user interface” concept is analyzed and types of user interfaces are considered. For representatives of each representative system, the article gives a list of typical ways of perceiving environmental information that should be considered in developing the user interface of educational publications. The main features of procedurally-oriented and object-oriented types of user interface are considered and their main parameters are presented. The implementation of an innovative component in the development interface of educational publications in the e-learning system is proposed to be implemented by adding the properties of adaptability to the user interface. Provisions are determined that define the user interface concept, on the basis of which the principles of constructing adaptive interfaces are formed. The basic principles of visual design of mental maps of electronic educational publications for the e-learning system are offered. The main features provided by the mental map are presented in the form of a visual diagram. The didactic interface of the developed e-learning edition is considered and the scheme of the user and publication interaction is given. The focus group method evaluates the user interface quality of the created e-learning publication.
Food trucks business in Curitiba ? Brazil: dream or nightmare?
Authors: Bischof-dos-Santos Christiane , Cicmanec Edna Regina
Published: December 2019

It is not uncommon people who loves cooking dream about owning a restaurant or at least working as a chef de cuisine. The food truck business emerged as an alternative for many people. But cooking talent is not enough to be successful in this business. Many other aspects can impact performance, and the regulation can be one of the barriers to these venturers. The purpose of this paper is to identify the current food trucks scenario in Curitiba in southern Brazil. In-depth analysis of the city regulations regarding food trucks operation as well interviews with both city and venturers representatives aims to uncover the current panorama of this business. Taken together, the analysis results illustrate how regulations in different instances still diverge, impairing homogeneous understanding by all involved stakeholders.
Motivações e dificuldades no processo de formalização do microempreendedor individual: percepção dos comerciantes do mercado de artesanato paraibano
Authors: Campos Aglaeudis Ferreira Rodrigues , Santos Magno Crescencio dos , Silva Ionara Salvador , Garcia Inajá Allane Santos
Published: December 2019

Sabe-se que a formalização de um empreendimento no Brasil é um processo deveras burocrático, ainda que algumas ferramentas virtuais regularizadas por órgãos competentes, a exemplo do Sebrae, tenham contribuído para agilizar o processo de formalização. Diante de tal cenário, o regime simplificado do Microempreendedor Individual (MEI) surge como alternativa favorável aos pequenos empresários, podendo realizar facilmente seu cadastro através do portal do empreendedor. Assim, buscou-se, por meio deste estudo, analisar a percepção dos artesãos do Mercado de Artesanato Paraibano em relação às motivações e dificuldades enfrentadas no processo de formalização do MEI. Para o alcance de tal objetivo, foi utilizado um questionário aplicado aos comerciantes do Mercado de Artesanato da Paraíba (MAP), localizado em João Pessoa, Paraíba. A partir das respostas obtidas, foi possível verificar que 29% dos artesãos que se fazem presente no mercado de artesanato não possuem conhecimento acerca do processo de formalização, assim como estão na informalidade, ao passo que, entre os formalizados (71%), 43% apontam como principal motivação para se formalizar a redução de impostos e 21% a baixa burocracia. Sobre as dificuldades relatadas, destacam-se a falta de facilidade de crédito e a emissão de nota fiscal.
Implementación de un sistema de control interno en la empresa PyC Tecnología Limitada
Authors: Navarrete esparza Marcelo andrés , Carrasco Miguel Urrutia
Published: December 2019

La presente investigación tuvo como propósito estudiar el sistema de control interno de una PYME existente en la Ciudad de Concepción ? Chile. El enfoque del trabajo es cualitativo sobre la base de un caso de estudio de una empresa PYME perteneciente al sector de servicios a la industria minera en Chile. Se llevó a cabo entrevistas y encuestas semi estructuradas aplicada a distintos personas de la empresa, también se utilizó estudios referentes a las empresas PYME en Chile y en Latinoamérica, su problemática y continuidad en sus negocios.  Los resultados de la investigación para este caso de estudio indican por un lado, que aun cuando ella logra sostenerse en el tiempo y administrar sus recursos financieros para continuar desarrollando sus actividades, por otro lado, su sistema de control es débil dado que el foco de atención de los dueños de la entidad se centran sólo en las operaciones normales de su negocio y en menos medida, en la información interna que sustentan los flujos de información. Una PYME que ha incrementado sus operaciones y comienza a estabilizarse, necesita que su información (manual y/o digital) sea administrada y mantenida bajo ciertos procedimientos y controles a objeto de salvaguardar los activos y recursos, contribuyendo de esta manera a la sustentabilidad y crecimiento de la empresa en el tiempo.
A empregabilidade dos egressos do curso técnico profissional em administração
Authors: Giordano Carlos Vital , Gonçalves Luiz Cláudio , Lourenço de Carvalho Flávio
Published: December 2019

O artigo objetiva apresentar a empregabilidade dos egressos do curso técnico em Administração em ETEC do estado de São Paulo e visa, também, responder à pergunta sobre o atendimento das expectativas com relação às necessidades de preenchimento dos empregos oferecidos na região. A investigação se baseou na literatura acerca do tema, análise documental e em questionário eletrônico enviado por e-mail aos concluintes do curso entre os anos de 2014 e 2017. Os resultados apresentados e discutidos se fundamentaram nos dados coletados por meio das entrevistas aplicadas a 43 ex-alunos. Observou-se que a avalição da contribuição do curso para as suas empregabilidades relaciona-se com os fatores socioeconômicos da região e, que o curso atende às expectativas em relação a sua criação e formação, mesmo sendo discretamente, segundo a opinião dos discentes, no sentido da inserção e recolocação no mercado de trabalho.
EFFECTS OF ANTHROPOMETRIC FACTORS, AGE, GENDER, AND FOOT POSTURE ON SINGLE LEG BALANCE PERFORMANCE IN ASYMPTOMATIC SUBJECTS
Authors: ÜNLÜER Nezehat Özgül , TAŞ Serkan
Published: December 2019

Purpose: The aim of the present study was to investigate the effects of age, gender, height, weight, body mass index (BMI), and foot posture on single leg standing balance performance.Methods: A total of 76 healthy young asymptomatic adults were enrolled (52 females and 24 males) with an age range of 19-49 years. Age, gender, height, weight, and BMI, foot posture (Foot Posture Index), and balance (Biodex Balance Systems) were assessed. Balance assessments were performed on the dominant leg.Results: A regression analysis showed that 43.2% of the anterior- posterior (AP) stability index score explained the total variance, and the effects of height (p=0.006, B=-4.387, β=-1.974,SD=1.554), weight (p=0.001, B=0.068, β=4.550, SD=0.020), and BMI (p=0.003, B=-0.171, β=- 2.833, SD=0.056) found statistically significant. The regression analysis also revealed that 66.5% of the variance in the medial-lateral (ML) stability index score and age (p=0.026, B=0.003, β=0.173, SD=0.001) and weight (p=0.048, B=0.022, β=2.031, SD=0.011). Foot posture and gender were not statistically significant in both AP stability index and ML stability index (p>0.05).Conclusion: The findings of the study showed that age, and anthropometric factors (height, weight, and BMI) are potential markers for balance assessments. These results suggest that age and anthropometric factors play an important role in balance performance in asymptomatic subjects
Non-stationary process characteristics of the gas outflow into a liquid
Authors: Alekseev M.V. , Vozhakov I.S. , Lezhnin S.I.
Published: December 2019

A numerical simulation of the process of the outflow of gas under pressure into a closed container partially filled with liquid was carried out. For comparative theoretical analysis, an asymptotic model was used with assumptions about the adiabaticity of the gas outflow process and the ideality of the liquid during the oscillatory one-dimensional motion of the liquid column. In this case, the motion of the liquid column and the evolution of pressure in the gas are determined by the equation of dynamics and the balance of enthalpy. Numerical simulation was performed in the OpenFOAM package using the fluid volume method (VOF method) and the standard k-e turbulence model. The evolution of the fields of volumetric gas content, velocity, and pressure during the flow of gas from the high-pressure chamber into a closed channel filled with liquid in the presence of a ”gas blanket“ at the upper end of the channel is obtained. It was shown that the dynamics of pulsations in the gas cavity that occurs when the gas flows into the closed region substantially depends on the physical properties of the liquid in the volume, especially the density. Numerical modeling showed that the injection of gas into water occurs in the form of a jet outflow of gas, and for the outflow into liquid lead, a gas slug is formed at the bottom of the channel. Satisfactory agreement was obtained between the numerical calculation and the calculation according to the asymptotic model for pressure pulsations in a gas projectile in liquid lead. For water, the results of calculations using the asymptotic model give a significant difference from the results of numerical calculations. In all cases, the velocity of the medium obtained by numerical simulation and when using the asymptotic model differ by an order of magnitude or more.
Modeling of the spherical explosion attenuation process using aqueous foam
Authors: Bolotnova R.Kh. , Gainullina E.F. , Nurislamova E.A.
Published: December 2019

The two-phase model of dry aqueous foam dynamic behavior under the strong shock wave influence is presented under assumption that the foam structure under shock loading is destroyed into a suspension of monodispersed microdrops with the formation of a gas-droplet mixture. The system of equations for the model of aqueous foam includes the laws of conservation of mass, momentum and energy for each phase in accordance with the single-pressure, two-speed, two-temperature approximations in a three-dimensional formulation, taking into account the Schiller–Naumann interfacial drag force and the Ranz–Marshall interfacial contact heat transfer. The thermodynamic properties of air and water forming a gas-droplet mixture are described by the Peng–Robinson and Mie–Grueneisen equations of state. The presence of non-uniform process in height of aqueous foam syneresis, which is due to gravitational forces, is taken into account by setting the distribution of the liquid volume fraction in the foam. An additional consideration of the syneresis process during calculating the intensity of interphase drag forces according to the Schiller–Naumann model was controlled by introducing the parameter depending on the spatial distribution of the initial liquid volume fraction of the foam. The spherical explosion is modeled in the form of the shock wave pulse whose energy coincided with the charge energy of the HE used in the experiments. The problem numerical solution is implemented using the OpenFOAM free software package based on the two-step PIMPLE computational algorithm. The numerical solution of the problem, obtained on the basis of the proposed gas-droplet mixture model, is in satisfactory agreement with the experimental data on a spherical explosion in aqueous foam. The analysis of the spherical shock wave dynamics while its propagation through aqueous foam is given. The causes of the significant decrease in the amplitude and velocity shock waves propagation in the medium under study are investigated.
Numerical simulation of acoustic scattering from coaxial sound-penetrable spheres
Authors: Nasibullaeva E.Sh.
Published: December 2019

This paper presents a generalisation of the mathematical model and numerical study of the acoustic scattering problem from multiple spheres in the case of spheres through which the wave passes and whose centers are located on the same axis (the case of sound-penetrable and coaxial spheres) under the action of spherical waves from a monopoly radiation source arbitrarily located in space. When solving the Helmholtz equations, a numerical technique based on the fast multipole method has been adapted for this task, which allows one to achieve high accuracy of the results obtained with minimal computer time. Comparison of the different approaches to truncation infinite series in the expansion showed the following: the result with a good degree of accuracy by a single calculation gives approach based on the truncation of all the rows with a fixed number in each expansion, and the result with a certain degree of accuracy gives an approach based on comparing two consecutive values of the sum of the series. A numerical parametric analysis of the pressure distribution inside and outside the spheres is carried out for various values of their radii, physical characteristics of the external and internal media, the number of spheres, the distances between the centers of the spheres, the frequency of exposure and the location of the monopole radiation source. It is shown that at certain values of the parameters, the appearance of zones of decrease or increase in pressure behind sound-penetrable spheres is possible. The obtained results will further allow to carry out test calculations to verify the general numerical algorithm for the case of a multitude of spheres arbitrarily located in space.
Numerical study of velocity slip of phases during the passage of a shock wave of low intensity from a pure gas to a dusty medium
Authors: Tukmakov D.A.
Published: December 2019

In this paper, the process of the movement of a direct shock wave from a pure gas into a dusty medium is numerically modeled. The mathematical model took into account the viscosity, compressibility and thermal conductivity of the carrier phase. Also, the modeling technique made it possible to describe the interphase force interaction, which included the Stokes force, the dynamic force of Archimedes, the strength of the attached masses. In addition, interfacial interaction included heat transfer between the carrier and dispersed phases. The numerical solution was carried out using the explicit finite-difference method, with the subsequent application of the nonlinear correction scheme for the grid function. As a result of numerical calculations, it was revealed that with an increase in the linear particle size of the gas suspension, the velocity slip between the carrier and dispersed phases increases. Numerical modeling also showed that the absolute value of the difference between the velocities of the carrier and the dispersed phase reaches the largest value at the leading edge of the compression wave. The revealed regularities can be explained by the fact that the particles of the dispersed phase are assumed to be spherical in shape. Due to this, a multiple increase in particle size leads to a three-fold increase in their mass, a twofold increase in the area of one particle and a three-fold decrease in the number of particles. Thus, an increase in particle size leads to a decrease in the area of interfacial contact and an increase in the inertia of the particles, which in turn affects the interfacial velocity slip.
Research of eigenfuctions perturbation of the transverse component velocity thermoviscous liquids flow
Authors: Nizamova A.D. , Kireev V.N. , Urmancheev S.F.
Published: December 2019

The viscous model fluid flow in a plane channel with a linear temperature profile is considered. The problem of the thermoviscous fluid flow stability is solved on the basis of the previously obtained generalized Orr–Sommerfeld equation by the spectral method of decomposition into Chebyshev polynomials. We study the effect of taking into account the linear and exponential dependences of the viscosity of a liquid on temperature on the eigenfunctions of the hydrodynamic stability equation and on perturbations of the transverse velocity of an incompressible fluid in a plane channel when various wall temperatures are specified. Eigenfunctions are found numerically for two eigenvalues of the linear and exponential dependence of viscosity on temperature. Presented pictures of their own functions. The eigenfunctions demonstrate the behavior of the transverse velocity perturbations, their possible growth or attenuation over time. For the given eigenfunctions, perturbations of the transverse flow velocity of a thermoviscous fluid are obtained. It is shown that taking the temperature dependence of viscosity into account affects the eigenfunctions of the equations of hydrodynamic stability and perturbations of the transverse flow velocity. Perturbations of the transverse velocity significantly affect the hydrodynamic instability of the fluid flow. The results show that when considering the unstable eigenvalue over time, the velocity perturbations begin to grow, which leads to turbulence of the flow. The maximum values of the eigenfunctions and perturbations of the transverse velocities are shifted to the hot wall. It is seen that for an unstable eigenvalue, the perturbations of the transverse flow velocity increase over time, and for a stable one, they decay.
Longitudinal oscillation of a rod with a variable cross section
Authors: Utyashev I.M.
Published: December 2019

Variable cross-section rods are used in many parts and mechanisms. For example, conical rods are widely used in percussion mechanisms. The strength of such parts directly depends on the natural frequencies of longitudinal vibrations. The paper presents a method that allows numerically finding the natural frequencies of longitudinal vibrations of an elastic rod with a variable cross section. This method is based on representing the cross-sectional area as an exponential function of a polynomial of degree n. Based on this idea, it was possible to formulate the Sturm-Liouville problem with boundary conditions of the third kind. The linearly independent functions of the general solution have the form of a power series in the variables x and λ, as a result of which the order of the characteristic equation depends on the choice of the number of terms in the series. The presented approach differs from the works of other authors both in the formulation and in the solution method. In the work, a rod with a rigidly fixed left end is considered, fixing on the right end can be either free, or elastic or rigid. The first three natural frequencies for various cross-sectional profiles are given. From the analysis of the numerical results it follows that in a rigidly fixed rod with thinning in the middle part, the first natural frequency is noticeably higher than that of a conical rod. It is shown that with an increase in the rigidity of fixation at the right end, the natural frequencies increase for all cross section profiles. The results of the study can be used to solve inverse problems of restoring the cross-sectional profile from a finite set of natural frequencies.
Features of students’ perception of a university’s organizational culture depending on their organizational identification
Authors: Pomyalova Valeria O. , Volkova Natalia V.
Published: December 2019

In the current reality, the higher education as the trajectory for the academic career faces particular difficulties. There is a downward trend regarding the number of young academic specialists — a negative factor for the entire educational system. The discussed problem may arise according to various reasons: changes in the law sphere or peculiarities of the educational organization activity. Both Western and Russian researchers conclude that the relations between an organization and its staff members are the key aspect of their loyalty. Thus, this article aims to examine the connection of a university organizational culture perception by the students with different types of identification demonstrated. The authors study the peculiarities of students’ perception of the university organizational culture. Altogether, 118 students participated in questionnaires that measure organizational culture with Organizational Culture Assessment Instrument and four types of identification with the university. The findings show the gap between students’ current and preferred perception of the university organizational culture. Consequently, the dominance of market culture that contradicts the desired “clan” culture orientation with the values of friendly and close relations environment, may influence the choice of academic career and postgraduate studies.