bluuebunny/crossref_metadata_2025 huggingface dataset:
Modelling volume changes of sand under thermal loads: a preliminary attempt
Authors: Zhou C. , Ng C. W. W. , Wang S. H.
Published: February 2017

Within the critical state framework, some thermo-mechanical models have been developed to simulate thermal volume changes of saturated soils. Most of the existing models are verified through the experimental results of silt and clay, and they cannot well capture the behaviour of sand under thermal loads. In this study, an elastoplastic model is newly proposed to predict thermally induced volume changes of saturated sand. The key component of the new model is the introduction of a state-dependent threshold temperature, TR, which can be determined experimentally. The TR is found to increase with an increase in the state parameter, which is defined as the difference between the current void ratio and the critical state void ratio. Depending on the state parameter, heating would induce overall contraction at temperatures below TR, but only cause overall expansion when the temperature is higher than TR. When the maximum temperature experienced by the soil specimen, Ty, is lower than TR, heating would induce not only elastic but also plastic strains. The plastic modulus becomes larger when the difference between Ty and TR is smaller. When Ty is larger than TR, sand response becomes essentially elastic. The new model is applied to simulate the behaviour of Toyoura sand under heating at different stresses and densities. It is shown that the measured and computed results are fairly consistent. The new model is able to capture well the state-dependent volume changes of sand under thermal loads.
Evaluación e impacto de las políticas públicas de financiamiento para las pymes
Authors: Orjuela-Díaz Héctor Iván , Riaño-Cruz Julián David
Published: February 2017

Introducción: en Colombia, existen políticas públicas de fortalecimiento dirigidas al sector de las pymes y enmarcadas en documentos del Consejo Nacional de Política Económica y Social (Conpes), a través de los cuales se desarrollan instrumentos de financiamiento. El objetivo de este estudio es evidenciar si las políticas públicas de financiamiento formuladas son evaluadas y analizadas según el impacto de los instrumentos de política pública utilizados. Metodología: revisión documental de políticas públicas de financiamiento, complementada por el análisis de la evaluación en la gestión de entidades públicas que desarrollan los instrumentos de políticas orientados al financiamiento de las pymes. Resultados: existen recursos significativos para el apoyo y el mejoramiento productivo de las pymes, pero no se establece su verdadero impacto; igualmente no se ha medido la relación entre los recursos colocados en el financiamiento de las pymes y su impacto en el fortalecimiento empresarial de estas. Conclusiones: hasta el momento, solo se ha evaluado el impacto de un instrumento de política pública como Fomypyme, sin constatar el fortalecimiento empresarial que este ha generado. Se recomienda al Gobierno realizar las evaluaciones del impacto de las políticas públicas de financiamiento implementadas en las que se evidencia realmente que las pymes están mejorando su posicionamiento competitivo, en el incremento de sus ingresos y reducción de pasivos.
Competencia espacial del voto en México y Centroamérica
Authors: León-Ganatios Luis Eduardo
Published: February 2017

Introducción: la teoría espacial del voto es un criterio que puede explicar la decisión de voto de los electores centroamericanos y mexicanos, tomando en cuenta la ubicación de votantes y partidos en una escala lineal de valores. Metodología: a partir de ubicaciones de votantes y partidos, se realizarán cálculos de resultados electorales y se compararán con resultados reales en elecciones en Centroamérica y México; de igual forma, se medirá la incidencia que produce el índice de polarización ponderada escalar con respecto al voto ideológico. Resultados: en la aplicación de correlaciones momento de Pearson se encontraron relaciones significativas en las hipótesis planteadas; la polarización ponderada incidió sobre el voto, y los resultados del modelo se correlacionaron con los resultados reales en forma medianamente significativa. Conclusiones: se comprueba que en Centroamérica y México un mayor índice de polarización ponderada escalar contribuye a una mayor relevancia del voto ideológico, y también se constata que el criterio de la teoría espacial del voto es eficaz para explicar el voto en dichos países.
Aproximaciones a la construcción del devenir de la(s) mujer(es) y a la aparición de formas alternativas de subjetividad femenina en la historia reciente
Authors: Martínez Paola
Published: February 2017

Propósito: en el presente artículo se pretende visibilizar y analizar la experiencia de las mujeres en la guerrilla marxista argentina de los años 1970. Se propone posicionar el agenciamiento en cuanto mujeres como lugar de deconstrucción y alternativa frente a la homologación de lo masculino como universal. Igualmente, tomar distancia de interpretaciones que se afincan en la carencia y la negatividad del actuar femenino, evaluado en relación con el varón. Descripción: a través de una perspectiva de análisis de género y feminista, se desentrañan aspectos que se consideran clave en la constitución de la subjetividad femenina, los cuales quedan de manifiesto en los testimonios de las exmilitantes, principal fuente de esta investigación. Puntos de vista: se refleja que la maternidad y la transmisión generacional entre las mujeres son aspectos determinantes en las constituciones identitarias femeninas. Por otra parte, se destaca que estos aspectos no son rescatados en las elaboraciones del periodo, cuyo actuar aparece devaluado y desvalorizado. Esto lleva a interrogarse acerca de cómo se visibiliza a las mujeres en el campo de la historia o en trabajos de género. Conclusiones: nuestro posicionamiento permite apreciar la vivencia desde otro parámetro, llegando incluso a visibilizar una conciencia genérica alternativa en estas mujeres militantes.
Percepción de la población costera de Jalisco, México, sobre el cambio climático
Authors: López-Fletes Carlos , Chávez-Dagostino Rosa , Davydova-Belitskaya Valentina , Cornejo-Ortega José Luis
Published: February 2017

Introducción: como consecuencia de la política de desarrollo en los Planes Estatales (Municipales) de Acción ante Cambio Climático en México, es obligatorio el estudio de impactos de cambio climático, así como la percepción de la población cobra vital importancia con el fin de elaborar estrategias de mitigación y adaptación. Por lo anterior, el objetivo de este estudio es determinar la percepción de la población en los municipios costeros de Jalisco ante esta problemática ambiental. Metodología: esta se basa en el análisis subjetivo e individual de la percepción sobre el cambio climático, desde la aplicación de encuestas a los habitantes de la región de estudio. Resultados: la mayoría de los encuestados percibe un aumento en la temperatura y conoce el término “cambio climático”. Sin embargo, pocos consideran que sus efectos afectarán su vida cotidiana. Este hecho puede dificultar las acciones locales y regionales para la adaptación y mitigación del cambio climático. Conclusiones: solo la participación de tres niveles unidos (gobierno federal, gobierno estatal y sociedad) permitirá un exitoso cumplimiento de estas acciones. Finalmente, la población costera de tipo rural reconoce más el término de “cambio climático” y lo asocia con algún impacto en su comunidad, a diferencia de la urbana del municipio de Puerto Vallarta, Jalisco.
THE EFFECT OF WRITTEN CORRECTIVE FEEDBACK ON HIGHER EDUCATION STUDENTS’ WRITING ACCURACY
Authors: Kisnanto Yustina Priska
Published: February 2017

AbstractWith the higher demand of accuracy on students’ writing in university level, the present study examines the effect of direct and indirect written corrective feedback (WCF) on students’ L2 writing accuracy. The study was conducted in a six-week period with 43 Indonesian university student participants majoring IT. The results of the pre- and post-writing tests showed that 1) the writing accuracy improvement of the students receiving direct WCF was statistically significant while the writing accuracy improvement of the students given the indirect WCF treatment was not; 2) the accuracy improvement in the untreatable error rate of the direct WCF group was the most significant compared to all types of error in both WFC student groups. The study concludes that considering the students’ current English proficiency level and learning setting with limited English exposure, written corrective feedback, especially the direct one, helps the university students improve their writing accuracy.Keywords: corrective feedback, L2 writing, higher education
The Presentation of Entrepreneurship Training Information in Shaping the Partisipants Atitude on Melati Program
Authors: Ashari Muhammad Syahwal , Hafiar Hanny , Subekti Priyo
Published: February 2017

Abstrak. Penelitian ini bertujuan untuk mengetahui hubungan antara sajian informasi pelatihan usaha dengan sikap peserta pada Program Melati. Dinas Koperasi dan UMKN Kota Bandung melalukan berbagai upaya untuk mecapai target yang sudah ditentukan oleh pemerintah disamping mencari solusi untuk mengurangi ketergantungan pengusaha kecil terhadap rentenir sebagai sumber modal usaha, salah satunya adalah melakukan pelatihan – pelatihan terhadap calon – calon pengusaha yang berada di Kota Bandung. Penelitian ini menggunakan metode kuantitatif jenis penelitian korelasional. Teori yang digunakan adalah Teori Integrasi Informasi dari Martin Fishbein. Teknik analisis yang digunakan adalah analisis deskriptif dan analisis inferensial dengan menggunakan rumus rank spearman. Sampel dari penelitian ini 95 orang dari 126 peserta kegiatan yang terambil dengan cara teknik sampling acak sederhana. Hasil dari penelitian ini menunjukan hubungan yang cukup berarti antara pelatihan usaha Dinas KUMKM dengan sikap peserta terhadap Program Melati. Valensi dan bobot informasi Pelatihan Usaha Dinas KUMKM Kota Bandung memiliki hubungan yang cukup berarti dengan sikap peserta terhadap Program Melati. Dinas KUMKM Kota Bandung seharusnya lebih memperhatikan penentuan alur informasi yang menyentuh keyakinan peserta terhadap kredit melati, dengan cara dapat mengikutsertakan pihak Bank yang menjadi rekanan pemerintah sebagai narasumber pelatihan.Kata Kunci: Informasi, Integrasi Informasi, Pelatihan Usaha, Sikap.Abstract.This study aims to determine the relationship between the grain business training information with the attitude of the participants of the Programme Budget. This study uses a quantitative type of correlational research. The theory used is the Information Integration Theory of Martin Fishbein. The analysis technique used is descriptive analysis and inferential analysis using Spearman rank formula. Samples from this study 95 of the 126 participants in the drawn by means of simple random sampling technique. The results of this study showed a significant relationship between the Office business training participants KUMKM attitude towards Program Budget. Valance and weight information KUMKM Business Training Department Bandung has a significant relationship with the attitude of the participants of the Programme Budget. KUMKM Office of Bandung should pay more attention to the determination of the flow of information that touches the confidence of participants to credit jasmine, by the way can engage the Bank who are the partners of the government as a training resource.Keywords: Information, Information Integration, Business Training, Attitude
ALIVE LIBRARY AS A BRAND POSITIONING IN SCHOOL LIBRARY BINA PERSADA
Authors: Sugara Septian , Rusmono Doddy , Agustina Susanti
Published: February 2017

Abstract. This research is motivated by the phenomenon of brand positioning implementation as a superiority at Perpustakaan Sekolah Bina Persada, which effectively increase the sense of belonging and users interest. Approach used in this research was case study qualitative. The data were collected by observation, interview and study of documentation. The findings of the research are : (1) alive library as brand positioning at Perpustakaan Sekolah Bina Persada is motivated by librarian’s concern of students’ visit restriction. (2) implementation of brand positioning at Perpustakaan Sekolah Bina Persada is generally successful, although the implementation hasn’t fitted the theory. (3) pattern of alive library brand positioning implementation, which has a possibility to be a model of implementation at another (school) library.Keyword : alive library, brand positioning, school library, librarian.        Abstrak . Penelitian ini dilatarbelakangi oleh fenomena implementasi brand positioning sebagai suatu keunggulan di Perpustakaan Sekolah Bina Persada yang mampu meningkatkan sense of  belonging dan minat kunjung pemustaka. Penelitian ini menggunakan pendekatan kualitatif studi kasus. Teknik pengumpulan data dilakukan dengan observasi, wawanara dan studi dokumentasi. Temuan hasil penelitian mencakup: (1) alive library sebagai brand positioning di Perpustakaan Sekolah Bina Persada dilandasi oleh keprihatinan Pustakawan terhadap pembatasan waktu kunjungan siswa ke perpustakaan. (2) implementasi brand positioning di Perpustakaan Sekolah Bina Persada dapat dikatakan berhasil, meskipun pada penerapannya belum sesuai dengan teori. (3) pola implementasi brand positioning alive library yang dapat menjadi model untuk diimplementasikan di perpustakaan (sekolah) lainnya.Kata kunci : alive library, brand positioning, Perpustakaan Sekolah, Pustakawan.
The Relationship Between Social Performance and Corporate Financial Performance
Authors: Mojaveri Hamidreza Salmani , Daftaribesheli Mohammadhadi , Allahbakhsh Amin
Published: February 2017

This study investigates the relationship between social performance and corporate financial performance based on the information of companies listed in Tehran Stock Exchange - Iran. Today, economic entity has to identify the needs of their surrounding environment and community and in general interested parties to continue their survival and link with executive operation of the manufacturing of their products and by explaining the necessities of community provide the best services and achieve their organizational goals by selling more products. Overall, the process to identify community needs and interested parties and surrounding environment and provide services to them placed in social performance framework which is considered as the important issues to achieve success for organizations in today's competitive world. Therefore, we can say that the companies which do better their social functions financially might be in a desirable place than other competitor. In this study have been selected 90 companies of Tehran stock exchange based on elimination sampling and in order to investigate whether good social performance also leads to better financial performance. Financial variables are ROA and ROE and social variables contain five dimensions of Mark vinola model which obtain from tracking in financial statements and notes and based on score between -2 and +2. Finally, we conclude that there is no significant relationship between the social performance and corporate financial performance.
Magnetic resonance imaging in the diagnosis of nonpalpable breast cancer
Authors: Vatankha S S , Saryev S A
Published: February 2017

Aim. To analyze sensitivity of magnetic resonance imaging (MRI) in the diagnosis of breast cancer when used after mammography and breast ultrasound.Methods. The study included 70 patients with nonpalpable breast lesions who had changes of breast tissue found at previous studies (mammography and breast ultrasound). MRI was performed with the use of Siemens Magnetom Avanto with magnetic field 1.5 Tl.Results. Most frequently nonpalpable lesions were diagnosed in 45 to 60-year old patients (60%), a little rarer - in 39 to 45-year old patients (22.9%), in patients at the age of 61 to 69 - in 10.0% (7 patients). 7.1% patients were over 70. All first detected nonpalpable lesions of breast were biopsied for morphological verification. With the combined use of mammography, sonography, MRI and stereotactic biopsy the diagnosis was made in 100% patients. MRI with contract enhancement showed no relation between sensitivity, specificity and reliability and density of breast tissues.Conclusions. MRI is considered a highly sensitive method of diagnosis and identification of changes found at mammography and breast ultrasound.
Histologic evaluation of pathologic changes in gastrocnemius muscle in the model of rodent hindlimb ischemia
Authors: Titova A A , Mavlikeev M O , Pevnev G O , Bilyalov A I , Abyzova M S , Latyshev A A , Sakhapov D I , Shafigullina A K , Deev R V , Kiyasov A P
Published: February 2017

Aim. Development of a model of hindlimb ischemia in rats to assess the effectiveness of gene and cell therapy.

Methods. In the first stage of this approach the external iliac artery was ligated immediately after bifurcation of the common iliac artery. Then the femoral artery was ligated before its branching into the descending genicular, popliteal and saphenous arteries with following dissection of arteries between ligatures. The second stage of this approach was performed seven days after the completion of the first stage: branches of popliteal artery to gastrocnemius muscle and formed collaterals were ligated and dissected. Hindlimb blood flow was assessed by laser Doppler flowmetry. Animals were euthanazied 14, 17, 21, 28, 35, 42 days after the first stage. The paraffin sections of gastrocnemius muscles were stained with Mallory trichrome and with antibodies to CD34.

Results. Histopathological analysis showed a continuous hindlimb ischemia of operated limb without any native skeletal muscle structure restoration and with significant interstitial fibrosis (11.895.53% vs 2.552.13% in intact limb by day 42, p 0.05). Polymorphic muscle fibers in operated limb with significantly smaller diameter and reduced capillary density (0.820.03 vs 1.910.06 in intact limb by day 42, p 0.05) were revealed. Laser Doppler flowmetry revealed reduction of blood flow in the operated limb (0.670.22 of intact limb blood flow by day 42).

Conclusion. Our developed two-stage model of hindlimb ischemia in rats leads to histologic changes characteristic for the same pathology in human.
Drug correction of functional constipation in children
Authors: Bulatov V P , Ziganshina A A , Kamalova A A , Nizamova R A
Published: February 2017

Aim. To conduct a comparative analysis of the effectiveness of lactulose and lactitol for the treatment of chronic constipation in children.Methods. 30 patients of the diagnostic unit of Children’s republican clinical hospital, Kazan, were randomly divided into 2 groups of 15 children matched by gender and age. Patients from group 1 were prescribed lactulose as a baseline therapy, and patients from group 2 were prescribed lactitol according to their age dose from day 1 of hospital stay with the assessment of the effectiveness on day 10 at discharge. Statistical processing of the results of research was conducted with the use of the program Biostatistica (S.A. Glantz, McGraw Hill) and spreadsheet editor Microsoft Excel 2003. The reliability of the data was calculated by methods of variation statistics. To compare performance when receiving lactulose and lactitol, paired Student’s t-test was used in case of normal distribution and Wilcoxon test was applied in case of skewed distribution. Pearson criterion was used to evaluate the correlation in case of normal distribution of the compared variables, and calculation of Spearman’s rank correlation coefficient was performed in all other cases. The differences were considered statistically significant at p 0.05.Results. As a result of hospital treatment, clinical improvement was observed in the majority of children in both groups. More than half of the subjects regardless of the choice of the osmotic laxative developed regular bowel movements and soft stools during hospital stay. Adverse effects occurred in a small percentage of subjects.Conclusions. The conducted study of efficacy and safety of lactulose and lactitol in children with chronic constipation confirmed similar efficacy and safety of these medications that allows recommending lactitol for widespread use in clinical practice.
PENGARUH KUALITAS PELAYANAN, FASILITAS DAN HARGA TERHADAP KEPUTUSAN PELANGGAN UNTUK MENGGUNAKAN JASA HOTEL OVAL SURABAYA
Authors: Desembrianita Eva , Ruslin Ruslin
Published: February 2017

ABSTRAKSIPertumbuhan bisnis perhotelan di Jawa Timur saat ini semakin membaik, hal ini terindikasi dari meningkatnya jumlah wisatawan yang menginap di akomodasi berdasarkan data tahun 2012 sampai 2014 yang menunjukkan peningkatan dari tahun ke tahun.Tujuan penelitian ini untuk mengetahui pengaruh Kualitas Pelayanan, Fasilitas dan Harga terhadap keputusan konsumen menggunakan jasa Hotel Oval Surabaya, metode yang digunakan dalam penelitian ini adalah kuantitatif dengan teknik analisis Regresi Linear Berganda. Populasi penelitian adalah konsumen yang menginap di Hotel Oval Surabaya, penentuan sample menggunakan incidental sampling sebanyak 50 responden. Hasil penelitian menunjukkan secara simultan maupun parsial kualitas pelayanan, fasilitas dan harga berpengaruh terhadap keputusan konsumen menggunakan jasa Oval Hotel Surabaya dengan nilai yang signifikan. Kualitas Pelayanan berpengaruh dominan terhadap keputusan konsumen menggunakan jasa Hotel Oval Surabaya.
MENINGKATKAN DAYA SAING PABRIK GULA DI INDONESIA ERA MASYARAKAT EKONOMI ASEAN
Authors: Tayibnapis Ahmad Zafrullah , Sundari Made Siti , Wuryaningsih Lucia Endang
Published: February 2017

ABSTRACTThe 1930s was the heyday of the Indonesian sugar industry that is capable of exporting to many countries and has become the country an exporter of sugar to two after Cuba, but the situation is reversed since 1967 in which Indonesia would import sugar from Brazil, India, and Thailand in order to meet the needs raw material consumption and food and beverage industry. The results showed that the cost of sugar production is very uneconomical because of inefficiency that stretches from the cultivation to processing in the factory so difficult to obtain profit margins. Target and beyond sugar self-sufficiency can not be achieved because highly regulated, there is no synergy and tends to conflicts of interests among ministries or agencies, and internal conflicts often occur between the sugar mill and the disharmony between sugarcane farmers by the sugar mill officials.In the competition of the sugar industry are more stringent, in the era of the Asean Economic Community, it means the level of efficiency of sugar factories in the country need special attention, the same thing also applies to industrial users of sugar, and sugar as a raw material components contribute to the creation of products food and beverage efficient so as to compete with similar products from other countries. Observing how the intense competition in the Asean Economic Community is based on free trade, the yield of sugar that’s a cost efficient production is very important and urgent at this time, including work to improve the welfare of farmers.
“MENINGKATKAN DAYA SAING SEKTOR RIEL DI ERA MASYARAKAT EKONOMI ASEAN”
Authors: Siahaan Matdio
Published: February 2017

ABSTRACTThis study aims how to the state and the development of Indonesia to level up the Competition in Asean Economic Community (AEC) of the real sector, of a free market in Southeast Asia which aims to stabilize the economies of member countries of Asean. Hopefully, by the MEA can overcome the problems in the economy in Indonesia.. This is indicated by the economic development of Indonesia in ASEAN is still below the rank of other states member.The Indonesian strategy prepared to facing the ASEAN Economic Community (AEC), among others, to harmonizedomestic economic policies that associated with the systems and rules of the ASEAN ,Development investment and economic growth through government policies City and Country of one of them by strengthening the UKM products to foster through packaging, registration of the mark, and improve competitiveness domestic products and facilitate UKMs in international exhibitions so that the products can be known globally UKMs.
Application of structure-energy failure theory for determining the probability of failure and durability of turbine and compressor blades of aircraft engines
Authors: Chernyaev A. I. , Trefilov V. A.
Published: February 2017

The aim of the present work was to develop a methodology for assessing reliability on the basis of physical characteristics of an element. To this goal, we used the structure-energy power failure theory. The use of the theory makes it possible to determine the probability of failure using the information on the internal damage of the material. The gas turbine engine blades of the first, second and third turbine stages, new and reconstructed high-pressure compressor blades of stage 5 were the object of the analysis. We used an industrial computer tomograph XTH 450 LC to carry out non-destructive testing. We carried out destructive tests on stands of the electrodynamic type. The probabilities of failure calculated by using the structure-energy failure theory correspond to the values of reliability indices obtained by the destructive experiments. We developed a computer program based on a statistical method for estimating the reliability of an aircraft engine. The program takes into account the reliability index of rotor blades calculated with the use of the structure-energy failure theory.
Curcuit-design solutions for producing devices of feed water flow rate control systems
Authors: Berestovitsky E. G. , Gladilin Yu. A. , Pyalov N. V. , Solovyev M. V. , Ermilov M. A.
Published: February 2017

Creation of a low-noise water flow control systems apparatus is the main objective of the research. The technique of carrying out the tests is based on the principles of acoustics, flow mechanics and the control theory. The main schemes of regulating the water flow rate are presented in the paper. It is shown that the scheme with the use of a flowmeter is the most promising in terms of improvement of vibronoise characteristics. A modular principle of constructing feed water rate control systems is presented. The design features of application of multistage rotary units of the apparatus meeting the hydrodynamic noise requirements for low rates without application of dissipative elements (e.g. mufflers) are formulated for the first time. Energy comparison of various control system schemes is carried out. It is shown that further improvement of operating devices in terms of vibronoise characteristics is possible with the use of the principle of serial-parallel water flow regulation. The results help to improve the mass-dimensional characteristics of systems and to increase their energy efficiency, to provide a low level of noise and to reduce the cost of production. The modularity of the apparatus ensures a high level of standardization and interchangeability.
Analysis of heat transfer in a helically coiled cooler of a mechatronic sample conditioning system
Authors: Gimadiev A. G. , Utkin A. V.
Published: February 2017

A mechatronic sample conditioning system requires a high degree of process automation. Special attention is to be paid to the cooling of a sample and maintaining its temperature and pressure. Therefore, the study of thermal performance of the sample cooler (heat exchanger) is an important step in the development of a sample conditioning system. The helically coiled sample cooler, highly efficient, compact and simple in its design, is the most perfect heat exchanger of the double-pipe type. The article discusses the problem of determining the efficiency of a countercurrent sample cooler. The experimental apparatus for testing the cooler is described. On the basis of processing the experimental data obtained by the least-square method a semi-empirical dependence for determining the heat transfer coefficient with an error of less than 8% was obtained. The semi-empirical dependence for the cooler under consideration is applicable for temperature ranges and flow rates that occur in sample conditioning systems for thermal power plants. The results obtained make it possible not only to verify the CFD calculations aimed at improving the cooler design but also to create a high-quality mathematical model of the cooler incorporated in a mechatronic sample conditioning system, to develop an algorithm for maintaining the desired temperature and diagnosing the amount of deposits on coil surface.
Mathematical models for evaluating the energy efficiency of ultralow power turbine drives
Authors: Kalabuhov D. S. , Grigoryev V. A. , Rad’ko V. M.
Published: February 2017

Ultralow power turbine drives are used in aerospace and other transport equipment as energy for various units, mostly supplementary ones. The main components of the drives are an input device, a very low power turbine and an output device. Improving the efficiency of low-power turbine drives is a vital task. Energy indicators, such as power efficiency and specific working medium consumption of the working fluid are some of the most important performance indicators. The article presents configurations of axial and centripetal turbine ultra-low power, describes their basic operating and geometrical parameters that influence the energy efficiency of the drive. We present mathematical models of the efficiency of the turbines of two types, obtained from the results of gas-dynamic computational experiments. The results of statistical correlation and regression analysis of computational experiments presented in the article show the adequacy of the mathematical models. We analyzed the degree of influence of the model factors and their interactions on the changes in the efficiency of using the influence coefficients and graphical analysis of the results of the optimization parameters of the turbine.
Dependence of methane laminar flame propagation speed on the pressure and initial temperature
Authors: Lukachev S. V. , Matveev S. G. , Zubrilin I. A. , Sigidaev A. V.
Published: February 2017

The paper presents the results that allowed obtaining the dependence of laminar flame propagation speed Sl on the equivalence ratio for a wide range of pressures and temperatures during methane combustion. A literature review was carried out to summarize the experimental data on the measurement of the Sl. The Sl was calculated using a kinetic mechanism GRI 3.0 within the required pressure and temperature range. The calculation results were generalized in the MATLAB software product to verify the Sl power dependencies on pressure and initial temperature. The results of calculation on the basis of the obtained approximating dependence were compared with the experimental data and results obtained by other authors. It was found that the exponents of power for the dependency on pressure and temperature are described not by constants or linear relations, but by second-degree equations on the fuel-air ratio. The results can be used in three-dimensional simulation of combustion processes and in calculations performed using engineering practices.
Increasing the efficiency of rotary piston engines by the use of the diesel cycle
Authors: Okorochkov V. V. , Okorochkova V. M. , Ravodin A. I.
Published: February 2017

The article deals with the task of increasing the efficiency of rotary piston engines by implementing an economical diesel cycle in a module with a three-arc epitrochoid and an external gearing kinematics scheme. The necessity of the diesel cycle is caused by the need of reducing specific fuel consumption in rotary piston engines that are currently widely used in light aviation, mostly for remotely piloted aircraft. The Wankel rotary piston engine with a two-arc epitrochoid, though having a number of advantages over traditional piston engines, is inferior to them in efficiency, particularly in partial load modes. The implementation of the diesel cycle in а cycloidal piston engine with a three-arc epitrochoid makes it possible to reduce specific fuel consumption by 30% while retaining the listed positive qualities, as well as to use diesel fuel which is preferable for high-altitude aircraft due to lesser tendency to gas formation in pipelines. The engine stator inner loop is made up by three arcs of the epitrochoid that form three working chambers equally-spaced along the perimeter, which provides a decrease of the stator thermal deformation during the operation of the engine. A method is developed to determine the geometric parameters of a rotary piston engine with a three-arc epitrochoid, and design work is carried out in the КОМPAS-3D code for a 50 h. p. diesel engine to be used in light aviation and as a drive of electrical generators, pumps and compressors for ground application.
Technique of compensating errors in machining of parts with sculptured surfaces
Authors: Pechenin V. A.
Published: February 2017

Machining of parts with sculptured surfaces using computer numerical control equipment and the control of their geometry is accomplished by 3D-models describing the master part. The article presents a technique of compensation of manufacturing errors, based on the incorporation of coordinate measuring of the part geometry in the machining process. The proposed technique involves changing of the machining program by restructuring 3D-model of the part according to the information on deviations obtained after the measurement. The technique allows the analysis of the measurement results and on-line correction of control programs for CNC metalworking equipment. The analysis of the measurement results consists in determining whether it is necessary to compensate the errors, and filtering the random error components not taken into account in compensation. Operational adjustment of control programs for metalworking equipment makes it possible to improve the quality of its products and the efficiency of production processes. The developed technique was implemented in the MATLAB application software package.
Method of transient simulation of combustion processes in a low-thrust rocket engine operating on gaseous hydrogen and oxygen
Authors: Zubanov V. M. , Shabliy L. S. , Stepanov D. V.
Published: February 2017

The article describes a method of simulating combustion processes in a low-thrust rocket engine. The engine operates on gaseous propellants: oxygen and hydrogen. Transient simulation was performed using ANSYS CFX software. Three well-known mechanisms of oxygen and hydrogen combustion reactions for the stationary mode are considered and described in detail. A method of converting data on gas properties specified by coefficients of state equations into the NASA format was developed as one of the results of research. It was found that the initial component composition can be obtained fast by stationary simulation using an EDM combustion model. The difficulties connected with the application of the FRC combustion model, associated with a large scatter of reference data are revealed and described. A way of generation of a Flamelet-library with an ANSYS CFX integrated CFX-RIF generator is described. A method of simulation of transient combustion processes in a low-thrust rocket engine based on the Flamelet-library is proposed. Cyclical motion of the temperature field in the chamber resembling the precession of a vortex flow core was detected in the course of testing the method. The proposed method can be used to study this process and other transient processes in rocket engines.
Analysis of low-thrust liquid rocket engines with a methane air pump unit
Authors: Ivanov A. I. , Kositsin I. P. , Borisov V. A.
Published: February 2017

The first airplane working on cryogenic fuel was developed in the USSR in early 1980s on the basis of the passenger aircraft Tu-154. It was then modified using a hydrogen engine installed instead of one of the three kerosene engines. That bypass turbo-jet engine was developed in Russia (Samara) under the guidance of General Designer academician N.D. Kuznetsov. The engine working on liquid hydrogen was designated NK-88 and the one working on liquid methane NK-89. A unique hydrogen turbopump unit was created for the supply of cryogenic fuel. The unit can also be used for liquid methane due to the possibility of readjusting the rotor frequency. To minimize the financial expenditures it is proposed to use the turbo-pump in low-thrust rocket engines that use liquid methane as fuel.
Открытое будущее как результат применения инновационных технологий в образовании
Authors: Горькая Жанна Владимировна , Худышева Мадина Крухмановна
Published: February 2017

Основное внимание авторы уделяют проблеме влияния инновационных форм обучения на особенности постановки целей и построения временной перспективы личности. Показана взаимосвязь методов обучения и особенностей временной перспективы личности. Исследование показывает, что использование инновационных форм подготовки способствует формированию активной и инициативной позиции учащихся, позитивному отношению к прошлому и ориентации на будущее.
Организация учебной деятельности в условиях здоровьесберегающей среды
Authors: Худышева Мадина Крухмановна
Published: February 2017

Статья посвящена вопросам применение здоровьесберегающих и оздоровительных технологий в образовательных организациях высшего образования, на примере МГТУ им. Н.Э. Баумана. Автор раскрывает понятие здоровьесберегающие технологии и их применение для организации учебной деятельности для обеспечения физического, психического и социального благополучия студентов. Дана попытка в пределах статьи показать направленность всех возможностей образовательных учреждений, нацеленных на сохранение, формирование и укрепление здоровья обучающихся.
Evaluación de la genética del gato doméstico (Felis catus) mediante genes del pelaje en Sahagún, Córdoba, Colombia
Authors: Causil-Vargas Luis Alfonso , Pardo-Pérez Enrique , Herrera-Benavides Yonairo Manuel
Published: February 2017

El objetivo de este trabajo fue evaluar la estructura genética en poblaciones de gato doméstico (Felis catus) mediante marcadores que codifican la coloración y el diseño y longitud del pelaje en Sahagún, Córdoba, Colombia. Mediante observaciones directas en recorridos por las zonas urbanas pertenecientes a seis barrios de Sahagún, entre mayo y agosto de 2015, se muestrearon aleatoriamente 153 gatos adultos, utilizando la nomenclatura recomendada por el Committee on Standardized Genetic Nomenclature for Cats (1968), atendiendo a los marcadores fenotípicos: O: Orange; a: Non-agouti; Tb: Tabby blotched; d: No diluido; l: Pelo largo; s: Manchado de blanco; W: Dominante blanco. Se midieron: frecuencia alélica, flujo génico y equilibrio Hardy-Weinberg a través del programa PopGene 1.31; la estructura genética mediante el programa FSTAT v. 2.9.3.2. El marcador Manchado de blanco fue el de mayor frecuencia, el Dominante blanco presentó los valores más bajos de las frecuencias alélicas, se obtuvo escasa diferenciación genética entre las poblaciones y un elevado flujo génico; se observó un exceso de heterocigotos a nivel poblacional y a nivel total, no hubo equilibrio Hardy-Weinberg en todas las poblaciones con relación a los marcadores Orange y Manchado de blanco; y se evidenció selección natural y artificial para estos marcadores.
Identificación de secuencias génicas relacionadas con la ruta metabólica de síntesis de glicósidos en Stevia rebaudiana
Authors: Jiménez-Quesada Karol , Álvarez-Figueroa Adriana , Garro-Monge Giovanni
Published: February 2017

Las plantas medicinales forman parte de la cultura de los pueblos desde tiempos inmemorables, pero los estudios sobre los procesos de síntesis de sus metabolitos secundarios son insuficientes. Por tanto, las tecnologías de transcriptómica y metabolómica han ganado credibilidad como opciones biológicamente más certeras para la caracterización del material vegetal, incluyendo estudios muy específicos en términos de expresión génica. 

Esta investigación tuvo por objetivo la búsqueda de genes de ruta de síntesis de glicósidos en Stevia rebaudiana, así como el análisis de regiones promotoras, para establecer relaciones entre sitios de interacción en el ADN y proteínas de anclaje reguladoras de la transcripción de Arabidopsis thaliana. Se secuenció una muestra de ARN mensajero a partir de tejidos de hoja de S. rebaudiana y se alineó contra las secuencias génicas reportadas. Algunos de los genes seleccionados se encontraron menos representados en el transcriptoma, lo que podría ser un indicador de la producción controlada de glicósidos regulada por ciertos genes; esto concuerda con los estudios correlativos, que han puesto de manifiesto la importancia de los genes SrCPPS, SrKS y SrKO en la regulación del contenido de glicósidos. El aprovechamiento de estos resultados involucra el estudio de los estímulos a los factores de transcripción que regulan la expresión génica dentro de la ruta metabólica de interés, como la respuesta al estrés hídrico y altos niveles de salinidad. 
Producción heteróloga y caracterización bioquímica del procoagulante humano Factor VIII para ensayos de cristalización de macromoléculas proteicas
Authors: Hernández-Carvajal Erick , Arce-Solano Silvia , Mena-Aguilar Didier , Fuentes-Prior Pablo
Published: February 2017

A pesar de la relevancia médica y el impacto económico en los sistemas de salud, las enfermedades cardiovasculares, tales como infartos cardíacos y accidentes cerebrovasculares, siguen siendo la principal causa de morbilidad y mortalidad en los países en vías de desarrollo. Esto se debe a que las bases estructurales y funcionales de los procesos de formación de los coágulos sanguíneos o trombos solo se conocen de forma incompleta. La trombina juega un papel esencial en estos procesos y los fundamentos atómico-moleculares de su interacción con otros factores que participan en el proceso de coagulación son poco conocidos, en particular el reconocimiento de importantes sustratos como los factores V y VIII, así como el receptor de plaquetas PAR1. Dada la importancia de estos factores, en esta investigación se produjeron fragmentos del factor VIII humano (FVIII) y se caracterizaron bioquímicamente para realizar ensayos de cristalización de complejos FVIII·Trombina. Para ello, (1) se sobreexpresaron heterólogamente los conectores ácidos entre los dominios del factor VIII (denominados FVIIIa1, FVIIIa2 y FVIIIa3), (2) se purificaron y caracterizaron estos fragmentos recombinantes, (3) se formaron sus complejos con la trombina y (4) se inició la búsqueda de las condiciones de cristalización de estos complejos proteicos. La producción del FVIII, y en particular la determinación de las condiciones en las que crecen cristales del tamaño y calidad apropiados, son un auténtico cuello de botella en los estudios de estructura-función, por ello se considera que la optimización de estos procesos permitirá obtener un mayor número de cristales de proteína de calidad adecuada para futuros estudios de difracción de rayos X.
Diseño de un sistema de adquisición de datos para fotogrametría con vehículos aéreos no tripulados (UAV)
Authors: Arriola-Valverde Sergio , Barahona-Contreras Andrés , Miller-Granados Cornelia , Rimolo-Donadio Renato
Published: February 2017

Este trabajo detalla el diseño e implementación de un sistema de adquisición de datos para un Sistema Aéreo no Tripulado (UAV), capaz de registrar en forma sistemática la información proveniente de sensores y dispositivos de imagen, manteniendo una referencia espacial y temporal precisa. El objetivo es emplear este sistema para recopilar información que posteriormente se procesa con técnicas fotogramétricas para crear modelos de elevación digital de alta resolución que permitan evaluar la cantidad de suelo erosionado en un cierto intervalo temporal. Dicha solución busca mejorar a futuro la cuantificación y el entendimiento de los procesos de erosión con respecto a las metodologías tradicionales que se usan en Costa Rica.
Estimación del potencial metanogénico de la codornaza considerando las variables de dilución, adición de nutrientes y codigestión
Authors: Salazar-Rojas Teresa , Porras-Acosta María , Vaquerano-Pineda Nicolás , Quirós-Rojas Alexia
Published: February 2017

El biogás ha ido ganando importancia como un combustible CO2-neutral por sus bajas emisiones de CO2. El biogás puede usarse para el calentamiento y/o la producción de electricidad o como aditivo para mejorar el combustible para los vehículos. Este artículo detalla la estimación del potencial metanogénico de la codornaza tomando en consideración las variables de dilución, adición de nutrientes y codigestión, con base en la medición del biogás por el método de desplazamiento de líquido y el empleo de la codornaza en codigestión con desecho de banano. 

Los resultados obtenidos al diluir la muestra indican que de las tres diluciones realizadas para el sustrato de codornaza, la correspondiente al 40% presentó el mayor volumen de producción de metano. Las diluciones experimentales garantizan que el potencial de biogás del sustrato no sea subestimado debido a la sobrecarga o por la inhibición del potencial. Al efectuar la adición de nutrientes para la producción de biogás, estos ayudaron a obtener una mayor cantidad de metano acumulado. Sin embargo, esta variable demostró no ser fundamental para alcanzar un buen rendimiento en la producción de metano con el sustrato experimentado. Además, la codornaza mostró ser muy buen sustrato para la codigestión con desecho de banano.
Videoscope Assisted Minimally Invasive Surgery (VMIS): 36‐Month Results
Authors: Harrel Stephen K. , Nunn Martha E. , Abraham Celeste M. , Rivera‐Hidalgo Francisco , Shulman Jay D. , Tunnell John C.
Published: February 2017

Background: Clinical outcomes from videoscope assisted minimally invasive surgery (VMIS) at 36 to 58 months are reported.

Methods: Fourteen patients having sites with residual probing depth (PD) of at least 5 mm and 2 mm loss of clinical attachment level (CAL) after initial non‐surgical therapy were treated with VMIS.

Results: At 36 months or greater post‐surgery there was a statistically significant improvement (P <0.001) in mean PD and CAL (PD: 3.80 ± 1.18 mm, CAL: 4.16 ± 1.18 mm) in all surgical sites compared with baseline. There was a mean improvement in soft tissue height (0.36 ± 0.64 mm, P = 0.03). In most cases, patients reported no postoperative discomfort.

Conclusions: Improvements from VMIS appear to be favorable when compared with previously reported results of periodontal regenerative surgery. All improvements were stable over time. The lack of post‐surgical recession after VMIS has not been reported with traditional regenerative surgery.