bluuebunny/crossref_metadata_2025 huggingface dataset:
Lifestyle intervention is superior to metformin in prevention of microvascular complications of diabetes in women, but socioeconomic barriers may lead to use of combination
Authors: Alaga Katanya C. , Haddad Jesse
Published: October 2021

A clinical decision report using:

Diabetes Prevention Program Research Group. Long-term effects of lifestyle intervention or metformin on diabetes development and microvascular complications over 15-year follow-up: The Diabetes Prevention Program Outcomes Study. Lancet Diabetes Endocrinol. 2015;3(11):866-875. https://doi.org/10.1016/S2213-8587(15)00291-0

for a patient with pre-diabetes who is concerned about the prevention of microvascular complications through lifestyle intervention while managing her busy schedule as a traveling house cleaner.
Implementation of high intensity interval training offers opportunity to enhance glycemic control in patients with type 2 diabetes
Authors: Lau Emily
Published: October 2021

A clinical decision report using:

Alvarez C, Ramirez-Campillo R, Martinez-Salazar C, et al. Low-Volume High-Intensity Interval Training as a Therapy for Type 2 Diabetes. Int J Sports Med. 2016;37(9):723-729. https://doi.org//10.1055/s-0042-104935

for a patient with newly diagnosed diabetes mellitus type 2.
Градостроительное наследие плана Петербурга Леблона для русского градостроительства
Authors: Мазаев Григорий
Published: October 2021

В статье показано влияние идей и планировочных ком­позиций, заложенных Ж.-Б. Леблоном в проект плана Санкт- Петербурга, на русское градостроительство XVIII-XIX веков. Леблон создал первый в России план «идеального» города, показав возможности регулярного градостроительства на основе единой модульной планировочной системы, кото­рая позволила создать разнообразные градостроительные композиции. В их основе - принцип объединения простых планировочных модулей в более сложные. В плане Петер­бурга, как и в плане Стрельнинского парка, Леблон исполь­зовал сходные планировочные приёмы, показав единство принципов регулярности для градостроительных объектов различного планировочного уровня. Планировочные идеи Леблона использовались на протяжении XVIII-XIX веков при разработке проектов «идеальных» городов России. Форма плана Петербурга повторена в плане Оренбурга, планировка города Семёнова буквально повторяет центральный плани­ровочный элемент Васильевского острова, построенный по диагональной планировке, не использовавшейся ранее в планах русских городов, а принципы построения композиции Петровского острова послужили основой многих планов го­родов. Результатом работы Леблона в России стало не только общее повышение градостроительной культуры, но и прямое заимствование разработанных им планировочных решений, ставших градостроительным наследием, своеобразным «учеб­ным пособием» для русских градостроителей той эпохи.
STATIC BENDING STRENGTH OF SANDWICH COMPOSITE PLATES WITH TETRACHIRAL HONEYCOMBS
Authors: Mazaev Alexey , Shitikova Marina
Published: October 2021

The article presents a numerical strength analysis of sandwich plates with solid face layers and tetrachiral honeycomb core layer under static bending conditions. An aluminum alloy was chosen as the material of plates. For honeycomb core layers, the discretization (number of unit cells) and the relative density were varied with a constant thickness. Calculations were performed for the case of bending with rigidly clamped ends and three-point bending within the framework of the theory of elasticity by the finite element method. The strength analysis enables one to determine the load values, at which the maximal stresses according to the von Mises criterion were equal to the conventional yield stress of the material. The aim of this work is to study the effect of discretization and relative density of honeycomb core layers of tetrachiral type on the str ength of sandwich plates.
DYNAMIC BEHAVIOR OF REINFORCED CONCRETE COLUMN UNDER ACCIDENTAL IMPACT
Authors: Savin Sergey , Kolchunov Vitaly
Published: October 2021

The analysis of scientific literature shows that to date, the physical parameters of the deformation of reinforced concrete bar structures during their dynamic buckling and the influence of the dissipative properties of the structural system on this process remain insufficiently studied. In this regard, the paper proposes an analytical solution to the problem of dynamic buckling of a reinforced concrete column when it is loaded with an impact load, taking into account the presence of initial geometric and (or) physical imperfections and damping properties of the system, as well as an analysis and assessment of the column deformationparameters based on the obtained analytical solution. An expression for the dynamic deflection of a bar element under its axial loading with a high-speed shock load, taking into account damping, is obtained in an analytical form. For practical calculations in a quasi-static formulation, the paper proposes an expression for the dynamic factor kd of bar structures under axial shock load. A numerical example of calculating a reinforced concrete column using the obtained analytical expressions with and without damping is considered. It was found that the maximum deflection of the elastic axis of the column under high-speed loading was achieved at t = 0.04 s. In this case, the total dynamic deflection taking into account damping was 4.8% less than the deviation without taking into account damping and 1.18 times more than the corresponding static value.
APPLICATION OF GRADIENT PROJECTION METHOD TO PARAMETRIC OPTIMIZATION OF STEEL LATTICE PORTAL FRAME
Authors: Yurchenko Vitalina , Peleshko Ivan , Biliaiev Nikita
Published: October 2021

The paper has proposed a mathematical model for parametric optimization problem of the steel lattice portal frame. The design variable vector includes geometrical parameters of the structure (node coordinates), as well as cross-sectional dimensions of the structural members. The system of constraints covers load-carrying capacities constraints formulated for all design sections of structural members of the steel structure subjected to all ultimate load case combinations. The displacements constraints formulated for the specifiednodes of the steel structure subjected to all serviceability load case combinations have been also included into the system of constraints. Additional requirements in the form of constraints on lower and upper values of the design variables, constraints on permissible minimal thicknesses, constraints on permissible maximum diameter-to-thickness ratio for the structural members with circle hollow sections, as well as the conditions for designing gusset-less welded joints between structural members with circle hollow sections have been also considered in the scope of the mathematical model. The method of the objective function gradient projection onto the active constraints surface with simultaneous correction of the constraints violations has been used to solve the formulated parametric optimization problem. New optimal layouts of the steel lattice portal frame by the criterion of the minimum weight, as well as minimum costs on manufacturing and erection have been presented.
BENDING WITH TORSION OF FIBER REINFORCED CONCRETE BEAM OF CIRCULAR CROSS SECTION
Authors: Bulkin Sergey
Published: October 2021

The article provides information about the tests of circle cross-section reinforced concrete beams made of high-strength steel-fiberconcrete on combined torsion and bending. Given information contains the main results: a diagram of the cracks with an indication of their opening width, the values of support reactions at the moment of cracking and at the moment before destruction. It was found that as the load is applied in beams made of high-strength steel-reinforced concrete, in the case of several cracks at the firststage, there is one crack increases. The beams are modeled in the design complex and given description of the main design parameters. The results of the calculation are presented and a comparative analysis of the results obtained with the experiments results. It is noted that the adopted models in the computational complexes require the development of subroutines and refinement
Patrón de distribución espacial de Polylepis rugulosa Bitter (queñoa) en diferentes exposiciones de ladera, Tacna (Perú)
Authors: Canales-Gutiérrez Angel , Gutierrez-Flores Ivon Rocio
Published: October 2021

Son pocos los estudios de distribución espacial de los bosques de queñoa que consideren diferentes condiciones ambientales, a pesar de ser ecosistemas amenazados por diversas actividades antrópicas. Por ello, el objetivo de este estudio fue determinar el patrón de distribución espacial de Polylepis rugulosa bajo diferentes exposiciones de ladera en la localidad de Ticaco de la región Tacna (Perú), para contribuir con información para la conservación de este tipo de vegetación. La evaluación se realizó en laderas Este y Oeste, en 56 parcelas de 10 x 10 m (100 m2) distribuidas aleatoriamente, dentro de las cuales se contabilizaron los individuos adultos de la especie. En ambas laderas, el patrón de distribución fue contagiosa, siendo más acentuada en la ladera de exposición Oeste (Índice de dispersión = 5,4). La densidad poblacional fue mayor en la ladera de exposición Oeste con 20,92 individuos en 0,01 ha, mientras que en la ladera de exposición Este se registraron 8,35 individuos en 0,01 ha. En el área de estudio el patrón de distribución de P. rugulosa se explica principalmente por las condiciones ambientales y tipo de regeneración predominante. Por tanto, el patrón de distribución espacial de P. rugulosa, resultó ser contagiosa en ambas laderas de la quebrada Queñoa en la región Tacna.
Performance evaluation of a WISP for the 2.4GHz and 5.8GHz bands supported in a factorial model
Authors: Vesga Ferreira Juan Carlos , Vesga Barrera José Antonio , Contreras Higuera Martha Fabiola
Published: October 2021

The wireless networks supported in the 802.11 standard play an important role in the field of connectivity, due to the benefits related to mobility, availability, speed and low cost of implementation. This study aims to experimentally find the factors that affect the performance of a WISP (Wireless Internet Service Provider) based on the 802.11 standard. In the proposed scenario, the behavior of the Throughput and delays in the transmission processes were analyzed based on factors such as frequency, distance and the number of stations connected to the Access point under study. In the results obtained, it was possible to demonstrate the levels of influence that the factors mentioned above reflected in relation to the performance of the link and the available bandwidth. The proposed model can be considered as an excellent tool for the analysis of future works related to the design of WISP.
Influence of the interfase modelling in numerical simulation of tied-back excavations
Authors: Ruge Cardenas Juan Carlos , Pellaton Juliet Alejandra
Published: October 2021

En términos de modelación numérica, uno de los aspectos que incide principalmente en los valores de presión de tierras de estructuras de contención ancladas, es la fricción o adhesión que se genera en la interfase entre el suelo y el material de la retención (generalmente concreto). Normalmente los proveedores de softwares basados en el método de elementos finitos, establecen que el valor de rugosidad no tiene mayor influencia en los resultados. No obstante, cuando se contrastan los datos de salida, en simulaciones numéricas, esto no es necesariamente verdadero del todo. Generalmente, este factor es simulado en los programas relacionando la resistencia de la interfase, con la resistencia del suelo. La contribución actual, pretende validar la influencia que posee la variación de diferentes parámetros relacionados con la rugosidad o fricción en los resultados de presión de tierras en un muro diafragma anclado. Los resultados muestran altas variaciones, con una elevada dependencia de los parámetros mencionados que tienen relación con la modelación de la interfase.
Aplicación del SMED en la industria: Revisión sistemática de la literatura a través de VOSviewer
Authors: Ospina López Diana Yomali , VILLANUEVA MATEUS TATIANA ANDREA , Ovalle Castiblanco Alex Mauricio
Published: October 2021

En la actualidad, el análisis bibliométrico juega un papel fundamental en la búsqueda de métodos cuantitativos para identificar las tendencias e impacto a nivel científico de campos de investigación. Este análisis, se realizó para la herramienta SMED (Single Minute Exchange of Die) en el sector industrial identificando mapas de red de co-ocurrencia, co-citación y co-autoría de palabras claves, autores y países, respectivamente en el software bibliográfico conocido como VOSviewer. El presente documento tiene por objeto implementar un análisis bibliométrico  a través de la literatura para conocer las características e impacto en el paso del tiempo del SMED. Para la ejecución del documento, se ha tenido en cuenta una ecuación de búsqueda en la base de datos de Scopus, encontrándose 433 artículos relacionados con el SMED en sectores industriales. Con este fin, la herramienta puede ser aplicada en el sector automotriz, textil y metalmecánico tanto en líneas de producción como en máquinas y los países que lideran la producción científica son India, China y Estados Unidos; en contraste, no se ha identificado producción científica en Colombia. Finalmente, las organizaciones del sector industrial requieren de la herramienta SMED que permitan reducir costos y a la vez, aumentar la productividad en un proceso de cambio de herramentales.
The main causes of changes in actual evapotranspiration and terrestrial water storage over the Eurasia inland basin
Authors: liu zhaofei
Published: October 2021

The climate of the Eurasia inland basin (EIB) is characterized by
limited precipitation and high potential evapotranspiration; as such,
water storage in the EIB is vulnerable to global warming and human
activities. There is increasing evidence pointing to varying trends in
water storage across different regions; however, a consistent conclusion
on the main attributes of these trends is lacking. Based on the
hydrological budget in a closed inland basin, the main attributes of
changes in actual evapotranspiration (AET) and terrestrial water storage
(TWS) were identified for the EIB and each closed basin. In the EIB and
most of its closed basins, the TWS and AET showed significantly
decreasing and non-significantly increasing trends, respectively. The
primary cause underpinning the significantly decreasing TWS in the EIB
was increasing AET. Approximately 70% of the increase in AET has been
supplied by increased irrigation diversions and glacial melt runoff. At
the basin scale, similar to the EIB, changes in AET were the predominant
factor driving changes in TWS in most basins; the exception to this was
the Balkhash Lake basin (BLB), Iran inland river basin (IIRB), Qaidam
basin (QB), and Turgay River basin (TuRB). In these basins, changes in
precipitation largely contributed to the TWS changes. The AET
consumption of other water resources was the main factor contributing to
AET changes in seven of 16 basins, including the Aral Sea, Caspian Sea,
Junggar, Monglia Plateau, Qiangtang Plateau, and Tarim River basins. The
increase in precipitation contributed more than 60% of increasing AET
in four of 16 basins, particularly in the Helmand River basin and QB
(>90%). Changes in precipitation and consumption by other
water supply sources contributed to approximately half of the AET
changes in the other five basins, including the Inner Mongolia Plateau,
Issyk-Kul Sarysu, BLB, IIRB, and TuRB basins.
Pan-European phylogeography of the European roe deer (Capreolus capreolus)
Authors: Plis Kamila , Niedziałkowska Magdalena , Borowik Tomasz , Lang Johannes , Heddergott Mike , Tiainen Juha , Bunevich Aleksey , Šprem Nikica , Paule Ladislav , Danilkin Aleksey , Kholodova Marina , Zvychaynaya Elena , Kashinina Nadezhda , Pokorny Boštjan , Flajšman Katarina , Paulauskas Algimantas , Djan Mihajla , Ristić Zoran , Novák Luboš , Kusza Szilvia , Miller Christine , Tsaparis Dimitris , Stoyanov Stoyan , Shkvyria Maryna , Suchentrunk Franz , Kutal Miroslav , Lavadinović Vukan , Šnjegota Dragana , Krapal Ana-Maria , Dănilă Gabriel , Veeroja Rauno , Dulko Elżbieta , Jędrzejewska Bogumiła
Published: October 2021

To provide the most comprehensive picture of species phylogeny and
phylogeography of European roe deer (Capreolus capreolus), we analysed
mtDNA control region (610 bp) of 1469 samples of roe deer from Central
and Eastern Europe and included into the analyses additional 1541 mtDNA
sequences from GenBank from other regions of the continent. We detected
two mtDNA lineages of the species: European and Siberian one (an
introgression of C. pygargus mtDNA into C. capreolus). The Siberian
lineage was most frequent in eastern part of the continent and declined
towards Central Europe. The European lineage contained three clades
(Central, Eastern and Western) composed of 2 to 8 subclades, many of
which were separated in space. The Western clade appeared to have a
discontinuous range from Portugal to Russia. Most of the subclades in
the Central and the Eastern clades were under expansion during the
Weichselian glacial period before the Last Glacial Maximum (LGM), while
the expansion time of the Western clade overlapped with the Eemian
interglacial. High genetic diversity of extant roe deer is the result of
their survival during the LGM in a large, contiguous range spanning from
the Iberian Peninsula to the Caucasus Mts. and in two northern refugia.
Freezing or death feigning? Beetles selected for long death-feigning duration showed other tactics against different predators
Authors: Asakura Masaya , Matsumura Kentarou , Ishihara Ryo , Miyatake Takahisa
Published: October 2021

Prey evolve anti-predator strategies against multiple enemies in nature.
We examined how a prey species adopts different predation avoidance
tactics against pursuit or sit-and-wait predators. As prey, we used two
strains of Tribolium beetles artificially selected for short or long
duration of death feigning. The results showed that, as prey, the short
strains displayed the same behavior, escaping, against the two types of
predators. On the other hand, death feigning is known to be effective
for evading a jumping spider in the case of the long strains, while the
present study showed that the long strain beetles used freezing behavior
against a sit-and-wait type predator A. venator in this study. The short
strain beetles were more easily orientated by predators and suffered a
higher rate of predation than the long strains. The time to predation
was also shorter in the short strains compared to the long strains. When
the predator was starved, even the long strains were preyed upon when
the predator was orientated toward the prey, suggesting the starvation
period, i.e., prey density, is an important factor for antipredator
behavior. Traditionally, death feigning has been thought to be the last
resort in a series of anti-predator avoidance behaviors. However, our
results showed that freezing and death feigning were not parts of a
series of behavior, but independent behaviors against different
predators, at least for these beetles. The results also suggest that the
differences in feeding rates between the strains could be explained by
differences in activity among the strains.
Multifocal periapical cement dysplasia in Ehlers-Danlos Typ VIII combined with leukoencephalopathy in de novo-mutation of c.890G>A, G297D [pEDS]
Authors: Nilius Manfred , Nilius MInou , Mueller Charlotte , Lauer Guenter , Koch Berit , Kohlhaas Marcus
Published: October 2021

Periodontal Ehlers-Danlos syndrome type VIII (pEDS) is rare and caused
by mutation in complement 1 subunit. Lack of attached gingiva, pretibial
plaques, joint mobility, skin fragility, and easy bruising consolidate
the diagnosis. We describe a case of de novo-mutation of pEDS with
generalized periapical cemento dysplasia (PCD) and leukoencephalopathy.
A new aqueous method for recovering high quality oil and deoiled meal from pecan kernels
Authors: Fu Shuting , Wu Wenbiao
Published: October 2021

The extraction of oil by a new aqueous method has been promoted because
it is environmentally friendly, safe and economical of cost. A new
aqueous method using 1.4:10.0 water-to-pecan kernel slurry ratio was
developed, which recovered 97.73% of oils from the kernel containing
70.47% crude oil content. The method had a higher oil recovery as
compared to enzyme-assisted extraction or solvent extraction or cold
pressing in terms of producing oil for safe consumption. The method
recovered oils with 0.47 mg KOH/g acid value and 0.34 mmol/kg peroxide
value which were identical to that obtained by enzyme-assisted aqueous
method and lower than that obtained by solvent extraction. The de-oiled
pecan meal obtained by the new aqueous method only contained 5.14%
residual oils, which was edible since no harmful chemical was added
during oil extraction. No waste water was produced during the aqueous
extraction of oils.
Causes and consequences of cultural and historical manor landscape fragmentation in the 19th - 21st century Latvia
Authors: Bara Lelde , Ziemelniece Aija
Published: October 2021

In the post-war years (50s-80s of the 20th century), the legislation of the Soviet Union defined that the list of monuments to be protected by the state is deemed a political document with ideological significance. Due to this reason, the list of architectural monuments was subject to politically motivated manipulations not only during Stalin's time, but also later.
The political situation after the occupation in 1940 required to adapt to the sovietization demands, didactically dividing cultural monuments into “progressive” and “bourgeois” or those unfit for socialist construction. The history of the cultural heritage protection measures has been related to politics. With the growing importance of cultural heritage in the formation of historical memory, the protection and promotion of monuments becomes an essential part of the ideology of nation states. A change in the state power means a change in the dominant political ideology, which affects the work of state institutions in the protection of cultural heritage.
The research topic has an interdisciplinary nature with the intertwining of political, economic and social aspects. The cultural heritage includes the political dimension and its role in shaping national identity models.
The rise of the Duchy of Courland in the first half of the 18th century made a serious contribution to the landscape of the Lielupe left bank basin in the Zemgale region. The landscape of the both historical ensembles of Svete and Vircava manors was disturbed (fragmented) by the economic and political position of the state. The basis for that was bringing new infrastructure in the nature.
As a result of political, economic and social pressures, the landscapes of cultural and historical manors have, over the centuries, fragmented and transformed the use of the original structure and functional landscape. The aim of the research is to identify and emphasize the causes and consequences of the fragmentation of the cultural and historical landscape of manors.
Geomorphing effect of sand fences in primary dunes of Gulf of Riga
Authors: Lapinskis Jānis
Published: October 2021

Finding a the most appropriate solution for the problems caused by coastal eros ion is very important, as erosion prevention and habitat management measures must promote the restoration of the natural balance (order of things before anthropogenic disturbances) and restore the coastal status quo as much as possible [6; 2].
Dune fences are a very widespread erosion management tool on developed sandy coastal areas due to ease of installation, inexpensiveness, and generally positive public attitude [1]. Effectiveness and impact of fences have also been studied in many places around the world, however previous studies in Latvia have been very limited and episodic [16].
This article shows the observed dune and high beach area evolution of the coast in Riga, a somewhat developed coastal section on the top of the Gulf of Riga, Latvia, over a 4-year period from 2017 to 2020. Dune fences were installed along several short, but significantly disturbed sections of coast in 2018 and 2019. Implementation area is one of the busiest parts of the coast of Latvia dealing with the highest level of anthropogenic disturbance. Data has been derived from cross-shore transects (n=12) along the 17 km long coastal section between Daugava and Gauja river mouths.
The findings generally indicate a very intense initial wind driven sand accumulation in the target areas compared to the background situation. It also seems that such a method may in the longer term be responsible for reduction of the primary dune height and beach width.
Large-scale comparison between the diffraction-component precision indexes favors Cruickshank’s Rfree function
Authors: Avram Sorin , Neanu Cristian
Published: October 2021

This study aims to provide a first large-scale comparison between the various diffraction-component precision index (DPI) equations, assess the applicability of the parameter, and make recommendations on DPI computation. The DPI estimates the average accuracy of the atomic coordinates obtained by the structural refinement of protein diffraction data, with application in crystallography and cheminformatics. Although, Cruickshank and Blow proposed DPI equations based on R and Rfree in order to calculate DPI values, which remain scarcely employed in the quality assessment of the Protein Data Base (PDB) files, due to the unclear data extraction protocols (to assign variables), the complex equations, the lack of extensive applicability studies and the limited access to automated computations. In order to address these shortcomings, the entire RCSB PDB database was evaluated using Cruickshank?s and Blow?s R and Rfree DPI variations. Computations of 143070 X-ray structures indicate that Rfree-based DPI equations apply to 30 % more protein structures compared to R-based DPI equations, with Cruickshank Rfree-based DPI (CRF) exceeding the number of successful Blow?s Rfree-based DPI (BRF) computations. Although our results indicate that, in general, the resolutions < 2 ? assure consistency among the various DPIs computations (differences <0.05 ?), we recommend the use of CRF DPI because of its wider applicability.
Thermal coupling effect analysis of geotechnical engineering reinforcement materials based on finite element analysis
Authors: Hu Zifu , Fei Hong
Published: October 2021

In the analysis of material thermal coupling effect, the stress-strain
relationship of material is seldom considered, which leads to the greater
influence of material grid strain effect, which leads to the poor accuracy
of material thermal coupling effect analysis. Based on this, this paper puts
forward the thermal coupling effect analysis of geotechnical engineering
reinforcement materials based on the finite element analysis. According to
the concept of cooling zone, the thermal resistance value of the material
is calculated. Combined with the stress relationship and thermal resistance
value, the thermal coupling effect of the material is analyzed by finite
element discretization. In the experiment, the geotechnical engineering
reinforcement material is used as the analysis object to analyze the
material thermal coupling effect. The result of the proposed method is
closer to the actual situation than that of the traditional method. The
accuracy rate of the material thermal coupling effect analysis is up to
98%, which proves that the proposed method is feasible.
Effects of five different parameters on biodiesel HCCI combustion in free-piston engine generator
Authors: Liu Chunhui , Wu Shaojie , Pang Shuo
Published: October 2021

A coupled 3-D CFD and detailed chemical kinetics model of free-piston engine
generator (FPEG) was adopted to investigate the effects of initial
parameters on homogeneous charge compression ignition (HCCI) combustion and
emission. Biodiesel with 115 species skeletal mechanism was selected as
fuel. Five different parameters, namely the initial pressure, the initial
temperature, the working frequency, the compression ratio and the fuel
equivalence ratio, were selected to analyze their influences in the HCCI
combustion simulation of FPEG. The simulation results showed that the
change of the five parameters had visible impact on the heat release rate of
HCCI combustion, which caused the in-cylinder temperature and pressure to
change, and also caused the emission content of NOx and SOOT to change
obviously.
Design approach for subsea data center based on thermodynamic theory under the premise of building energy conservation
Authors: Liu Fang , Ya Zhao , Yuan Ligang , Zeng Yang , Zhai Caiyan , Tong Zhuozhuang , Huang Juan , Li Hao , Liu Jiayi
Published: October 2021

Traditional data centres often require additional energy to drive air
conditioning fans etc. to dissipate heat due to the serious power generation
problems of servers, which in effect raises the economic costs. Seawater,
with its high specific heat capacity and fluidity, offers a viable research
direction for reducing economic costs, and this paper is based on this
problem. The study shows that it is feasible to use containers as the main
structure of the data centre. The number of servers n 860 that can be
tolerated by the cooling capacity of the container without considering the
limit of geometrical constraints is obtained by calculation. Secondly, in
order to enhance the heat dissipation capacity of the data centre, the 6 cm
straight ribbed crown fin heat dissipation enclosure is proposed to have the
best heat dissipation capacity when comparing various heat dissipation
enclosure configurations. A comprehensive assessment model of material
properties was established, and the weights of each straight index were
determined by analytic hierarchy process, and then the metals were ranked
according to the specific scores of each index. The results show that nickel
alloys and aluminium alloys are the most suitable.
Az MH Geoinformációs Támogatási Doktrína felülvizsgálata az újonnan rendszeresített technikai eszközök tükrében II. rész
Authors: Balog Péter
Published: October 2021

Jelenleg zajlik a 2014-ben kiadott Magyar Honvédség (MH) Geoinformációs Támogatási Doktrína felülvizsgálata, megújítása, a nemzeti sajátosságoknak, követelményeknek megfelelően biztosítva az Európai Unió (EU) és az Észak-atlanti Szerződés Szervezetének (NATO) tagjai közötti együttműködéshez, a geoinformációs anyagok interoperabilitásához szükséges feltételeket. A tanulmány első része bemutatta az MH Geoinformációs Támogatási Doktrína felülvizsgálatának időszerűségét és szükségességét az újonnan beszerzett technikai eszközökkel összhangban. A tanulmány második részében a szerző ismerteti a konkrét, érvényben lévő magyar és nemzetközi együttműködésből adódóan alkalmazandó irányelveket, és javaslatot tesz a megújuló doktrína változtatásaira annak érdekében, hogy a szövetségesi kötelezettségből fakadó geoinformációs feladatokat a Magyar Honvédség maradéktalanul el tudja látni.
Betonszerkezetek károsodása lövedékbecsapódás hatására I. rész
Authors: Hlavicka-Laczák Lili Eszter , Hlavička Viktor , Károlyi György , Hajdú Ferenc , Nehme Salem Georges , Vozsech István
Published: October 2021

A 2001. szeptember 11-i terrortámadás óta a kiemelt építményeket megnövekedett biztonsági elvárások mellett szükséges tervezni. Ez az előírás az újonnan épített nukleáris létesítményekre, köztük a Paks II. atomerőmű-beruházásra is vonatkozik. Ezen megnövekedett biztonsági igények meghatározzák, hogy a tervezett atomerőmű konténmentjének ellen kell állnia egy repülőgép-becsapódásnak is. Ilyen léptékű ütközés során igen sokféle extrém terhelés éri az építményt, kezdve a géptörzs felmorzsolódásától, a leszakadó hajtóművek behatolásán át, a kiömlő hajtóanyag berobbanásáig. Kevés ilyen skálájú kísérlet eredménye ismeretes, ezért a tervezés során nagy szerep jut egyrészt az elméleti megfontolásoknak és numerikus vizsgálatoknak, másrészt különféle tapasztalati képletek alkalmazásának. A számítások validálásához azonban szükség van megbízható mérési eredményekre. Sajnálatos, hogy a szakirodalomban fellelhető eredmények érvényességi köre nincs kellően körülhatárolva, ezért a Budapesti Műszaki és Gazdaságtudományi Egyetem és a Magyar Honvédség Modernizációs Intézet együttműködésében lőtéri tesztek segítségével vizsgáltuk a lövedék sebességének és a beton minőségének a hatását beton céltárgyak károsodására.
A Machine Learning Approach to Modeling Pore Pressure
Authors: A Tanko
Published: October 2021

Machine Learning techniques and applications have lately gained a lot of interest in many areas, including spheres of arithmetic, finances, engineering, dialectology, and a lot more. This is owing to the upwelling of ground-breaking and sophisticated machine learning procedures to exceedingly multifaceted complications along with the prevailing advances in high speed computing. Numerous usages of Machine learning in daily life include pattern recognition, automation, data processing and analysis, and so on. The Petroleum industry is not lagging behind also. On the contrary, machine learning approaches have lately been applied to enhance production, forecast recoverable hydrocarbons, augment well placement by means of pattern recognition, optimize hydraulic fracture design, and to help in reservoir characterization. In this paper, three different machine learning models were trained and utilized to explore the feasibility of forecasting pore pressure of a well. The machine learning algorithms include, Simple Linear Regression, Decision Stump and Multilayer Perceptron (ANN). The predictive accuracies of the algorithm was analyzed using statistical measures. Five (5) parameters were utilized as input variables in the models: hydrostatic pressure, overburden pressure, observed and normal sonic velocities and pore pressure. 80% of the data was used in training while the remaining 20% was used for testing of the models. A sensitivity analysis of the five variable was conducted so as to identify correlations of the variables. Results of the sensitivity analysis revealed that both hydrostatic and overburden pressures appear to have the strongest correlation with pore pressure (0.766) and closely followed by normal compacted sonic velocity (0.753). Meanwhile, observed sonic velocity has the least correlation (0.046). The models were appraised by determining their Relative Absolute Errors. Results indicate that Multilayer Perceptron has the best prediction and least Relative Absolute Error of 5.77%. While the Decision Stump model had a Relative absolute error of 54.41%. The Simple Linear Regression had a relative absolute error of 67.93%. By and large, all three models appear to be suitable for modeling pore pressure but the Multilayer Perceptron is the most accurate.
Electrophysical Apparatus for Intensifying the Production of High-Viscosity Oils
Authors: AG Ponomarenko
Published: October 2021

The production of heavy high-viscosity oils is associated with the formation of asphalt-resin-paraffin deposits in the pipelines of the wells, which leads to a rapid decrease in their flow rate. Currently, a variety of mechanical, chemical, thermal and combined sediment removal tools are used in oilfield practice. Nevertheless, there remains a request for the search for new technological solutions that would allow environmentally sound removal of deposits without interruptions in the process of oil production with minimal energy and labor. This article reports on the first results of developing a new technology for removing deposits from well pipes, which is based on their non-contact local induction heating. At the contact point of the deposits with the heated section of the pipe, their partial melting occurs, as a result of which the bulk of the deposits in the form of large fragments is removed together with the oil flow. The inductor moves slowly along the axis of the well, receiving a high-frequency current from a nearby immersed energy converter.
A Review on the Thermochemical Pretreatment of Lignocellulosic Biomass for the Production of Coal-grade Solid Biofuel
Authors: Chakraborty Jyoti Prasad
Published: October 2021

Thermochemical pretreatment or torrefaction of biomass is rapidly gaining attention because of simple operation, efficacy, and potential to produce valuable solid fuel. Torrefaction of lignocellulosic biomass is reviewed with the purpose of understanding the present state-of-the-art and future prospects. The following aspects have been discussed: biomass selection, optimization of engineering parameters, characterization of solid, liquid, and gaseous products and finally comparison with coal so that torrefied biomass may be blended with coal and utilized in a pulverized coal-fired furnace to produce electricity.
Prospects and Forecasting of Deep-Seated Oil and Gas Reservoirs of the Meso-Ceno Deposits of Azerbaijan
Authors: LA Sultanov
Published: October 2021

Recently, in the Republic has been deploying drilling explorations from the eastern part to less studied central and western areas. In this reason, had a particular importance the generalization of the available geological and geophysical materials related to the new focus territory, the evaluation of the prospects of individual lithologic-stratigraphic complexes and the forecasting of deep-seated oil and gas reservoirs. Studies carried out in this direction are given in this paper, which describes the analysis of different petrophysical data. At the same time were re-interpreted reservoir and petrophysical properties of rocks, mesocenozoic deposits taken from the drilled exploratory wells and geological material of the areas of oil and gas bearing area, where are widely distributed deposits of the productive strata (PT-lower Pliocene). As a result of analysis and interpretation of geological, geophysical and petrophysical date, it has been established that oil-and- gas-bearing reservoirs are mainly fractured volcanogenic-sedimentary and carbonate rocks.
Microalgae to Energy
Authors: O Olushola
Published: October 2021

Microalgae, an organism which is considered as a potential source of biofuel from the last decade endowed with excellent capability of CO 2 capture and sequestration, water treatment, prolific growth rate and enormous energy content. The Soxhlet extraction of lipids from microalgae (Chlorella Vulgaris, Nannochloropsis sp., and Thalassiosira weissflogii), was carried out with several solvents (methanol, ethanol, isopropanol, acetone, and hexane), pure and mixtures, in order to optimize the extraction process. For the paper, the highest amount of lipid was obtained using a combination of methanol and acetone or methanol alone. The extract liquid fractions were treated with activated carbon to remove the green pigment. Attempts to in situ algae oil transesterification were accomplished using acid (H 2 SO 4 ) and base (NaOH and CaO) catalysts. The extend of extraction processes was assessed by infrared spectroscopy.
Comparison on the Performance of Moringa and Neem Root Extracts on Crude Oil Degradation in Soils Environment
Authors: CP Ukpaka
Published: October 2021

Degradation of Crude oil in different soils environment was monitored using two different species of plant extract namely moringa and Neem roots. Four different types of soil was investigation namely loamy, sandy, clay and silt soil all obtained from Niger Delta area of Nigeria as well as the Moringa and Neem roots including the alcohol and water media with the aims to extract the useful nutrient that can enhance microbial activities on crude oil degradation. The mass of 500g and 600g of the moringa and Neem roots fermented extracts were introduced into the various polluted soil types investigated and the result obtained show increase in degradation of Total Petroleum Hydrocarbon (TPH) with increase in time in all the soil types. Degradation of the TPH was more rapid in sandy soil environment and less in silt soil environment in moringa in water and alcohol as well as in Neem in alcohol and water media. The research work also revealed that degradation was faster in moringa in water than all others, showing the acceptability of moringa root as a major radiant for crude oil polluted environment. The aim of this research work is to examine the effectiveness of fermented moringa and Neem roots extract for remediation of crude oil polluted soils of different environment.
Estimation of Viscosity of the N-Alkane (C1-C 4) in Bitumen System Using Adaptive Neuro-Fuzzy Interference System (ANFIS)
Authors: HR Kuyakhi
Published: October 2021

One of the important mechanisms in solvent-aided thermal recovery processes is viscosity reduction. Light n-alkane hydrocarbons are among the potential solvents for solvent-aided thermal recovery processes. In this study, the viscosity of C1- C4 n-alkanes in bitumen was investigated. Adaptive neuro-fuzzy interference system (ANFIS) was used for this aim. The result obtained by the ANFIS model analyzed with the statistical parameters (i.e., MSE, MEAE, MAAE, and R2) and graphical methods. Results show that the ANFIS has high capability to the prediction of solvent/bitumen mixture viscosity.
Improvement of the Method of Control of Hydrate Formation Inhibitors in Laboratory Conditions
Authors: S Leontiev
Published: October 2021

This article provides a description of the experiment with inhibitors of hydrate formation. The article describes the existing methodology, its scope and possible results. The article also provides experimental data that show that the boundaries of the method can be expanded due to different approaches to the formulation of the experiment in this method.
Automated Monitoring The Temperature Under Buildings With Pile Foundations In Salekhard (Preliminary Results)
Authors: Kamnev Yaroslav K. , Filimonov Mikhail Yu. , Shein Aleksandr N. , Vaganova Nataliia A.
Published: October 2021

In the paper, we consider a method of ground temperature monitoring using the thermometric boreholes and computer modeling the residential buildings with the pile foundation in the city of Salekhard; note that it is located in the permafrost zone. Construction of the residential buildings and industrial structures in the permafrost zone and their operation is carried out according to the principle of preserving the frozen state of foundations. For ground temperature monitoring, thermometric boreholes are used. In a given time period, the measured temperatures are transferred to a server for further processing. Information about the temperature is an important factor for the safety of the buildings and it can be used to evaluate the piles bearing capacity. It allows to propose options for the soil thermal stabilization or to eliminate the detected technogenic heat sources. An approach of mathematical modeling to reconstruct the temperature fields in the pile foundation base of a building is discussed taking into account the data of temperature monitoring. 24 boreholes were equipped with more than 400 in-borehole thermal sensors for testing the method under the residential building I. The preliminary modeling is carried out for December and January 2020 for the contact thermal conductivity model with phase transition with the upper part of the geological section typical for Salekhard (the sandy soils). The modeling describes the freezing processes during the months in detail. The thermal monitoring allows to say that the ground in the base of the Residential building I is stable. But there are detected heat transfers near the borehole T1 at the depth of 12–14 m. The combination of monitoring and computer modeling makes it possible to assess the safety of the operation of the residential buildings in cities located in the permafrost zones.
Contribution Analysis Of Permanent And Sporadic Controls Of Co2 Efflux From Chernozems Over Four Seasons
Authors: Karelin Dmitry V. , Sukhoveeva Olga E.
Published: October 2021

We analyzed four years field observations (2017–2020) of soil CO2 efflux from Chernozems of arable and foreststeppe ecosystems of Kursk region (Russia), which correspond to the period of the maximal current warming. Three wellknown simulation models of different structure and variable sets (DNDC, RothC, T&P) and nonparametric regression analysis were used to estimate annual CO2 emission from soil and contributions of constant and sporadic controls. The applied models satisfactorily predict both the rate of annual soil CO2 emission and its seasonal dynamics on arable Chernozems. However, while RothC is suitable for the whole set of crops considered, DNDC is most suitable for cereals and T&R for bare soils only. A comparison of the contributions of permanent and sporadic factors to soil respiration showed that on an inter-annual scale soil temperature and moisture are less important than yearly crop rotation in Chernozem plowlands, making the latter the most important predictor apart from general land-use type. Although the combination of significant permanent and sporadic factors is able to explain 41% of the soil CO2 emission variance, the leading involvement of spatial controls prevents the construction of quantitative regression models that are able to make forecasts, requiring the use of more sophisticated simulation models (i.e. RothC) in this case. However, the use of the latter does not yet solve the problem of predicting soil CO2 emission and its net balance in forest-covered or steppe areas of Chernozem forest-steppe landscape.
Education and professional training: blended learning in maritime english teaching
Authors: Shvetsova Iryna , Fediaieva Valentyna , Moroz Olena
Published: October 2021

This paper explores the peculiarities of blended learning approach in teaching Maritime English. The research is aimed to reveal the pedagogical potential of Blended Learning approach in teaching Maritime English. The conceptual idea of the paper is grounded on the recognition of digitalization potential to transform how higher education is delivered and how people learn at different stages of their lives. The research reveals the pedagogical potential of computer-based tools and blended learning approach in Maritime English classroom. The attempt has been made to provide the effective techniques and methods of professionally-oriented communicative competency formation and development by means of Blended Learning implementation at different stages of professional Maritime training. The on-line course in Maritime English, delivered to the learners via LMS Moodle, which is complemented with the face-to-face traditional classroom learning, is described in the research to exemplify the use of the Blended Learning approach for teaching first year students of maritime educational institutions.
Formation of labour resources reproduction conditions of a transnational industrial corporation in the concept of sustainable development goals
Authors: Klimenko Olga I. , Velikanskiy Roman N. , Bezuglova Yulia V. , Emirova Irina U. , Laipanov Ahmad I.
Published: October 2021

The recovery of labour resources became a topicality of our study. The purpose of the study was the identification and justification the specific conditions for the reproduction of labour resources of a transnational industrial corporation. In the presented research was used the identification of typical problems characteristic of labour resources reproduction of the industrial sector of national economies, as well as the unification of the conditions for reproduction of labour resources, determined by international rules for socially responsible business. And the conditions for the reproduction of labour resources are presented such as: the formation of values of responsible leadership based on the principles of the UN Global Compact; commitment to the Sustainable Development Goals in supporting the reproduction of labour resources; development of interaction with stakeholders.