bluuebunny/crossref_metadata_2025_split huggingface dataset:
Particle Size Measurement of Reaction Product Aerosol of Sodium-Oxygen
Authors: Deguchi Y. , Kamimoto T. , Kikuchi S. , Kurihara A. , Takata T. , Ohshima H. 
Published: November 2019

Abstract
A multi-level scenario simulation system as a safety infrastructure technology is required for design optimization, safety margin adjustment, and innovative technology developments of sodium-cooled fast reactor (SFR). In order to properly implement the Verification and Validation (V & V) of the simulation system, it is indispensable to ensure experimental database of sodium chemistry as specific SFR safety issue. In this study, measurement results of aerosols generated by sodium-oxygen reaction for sodium fire event were reported with the aim of clarifying the radiation heat transport phenomena in the reaction field. The sodium-oxygen counter-flow diffusion flame was formed one-dimensionally above the sodium pool by the reaction between sodium vapour and oxygen. Argon (Ar) including 2% oxygen were introduced to a liquid sodium pool (temperature: 820K) under the reduced pressure condition (0.05MPa). Ar guard flows were employed to stabilize the reaction. The reaction continued more than 600 seconds without any changes in terms of flame shape and position. Aerosol size was measured as a function of Z (the distance from the sodium pool surface) and r (the distance from the center of the sodium pool). Laser Induced Incandescence (LII) and the Mie scattering method using the different wavelength laser beams (405nm, 450nm, 520nm, 532nm, 638nm and 650nm) were employed to ensure the measurement accuracy. Aerosol sizes from several hundred nm to 1 μm were measured in this reaction field and the aerosol size increased toward the sodium pool. This stemmed largely from aerosol growth and polymerization because the flow rate decreased near the sodium pool. It was also confirmed that the size of aerosol measured by LII was in good agreement with the measurement using the Mie scattering method under the same conditions. The refractive index of the aerosol was also evaluated to be 1.42-0.5i.
Stefan Problem with Internal Heat Generation: Comparison of Numerical Modeling and Analytical Solution
Authors: Crepeau J C , Yu Sakhnov A , Naumkin V S 
Published: November 2019

Abstract
The Stefan problem with internal heat generation can be found in various industrial applications. In particular, this problem describes melting of nuclear fuel rods during a reactor emergency. The present study reports on numerical modeling of the heat conduction equation and the Stefan equation with an application of the method of catching of the front into a space grid node. To solve numerically the heat conduction equation we realized an implicit four-node scheme using the Thomas method and iteration procedure.
Experimental study of local void fraction distribution in bubble flow in rod assembly
Authors: Vorobyev M A , Kashinsky O N 
Published: November 2019

Abstract
In this work an experimental study of local void fraction distribution in square arrangement rod bundle channel 3 * 3 under bubble flow regime was carried out. Measurements were performed with conductivity probe help, which was introduced into the flow through an angular or side rod at an angle of 15° to the flow. This method made it possible to determine the local void fraction close to the walls of the rods and in the narrow gap between them. Measurements have shown that a dome-shaped profile of local void fraction is realized in the gap between the side rode and the central one, while a saddle-shaped distribution of the void fraction is observed on the line connecting the central and angular rods. Also the effect of the spacer grid on the distribution of the gas phase in the channel was shown.
Investigating characteristics of diesel fuel spray in a perspective burner
Authors: Anufriev I S , Kopyev E P , Mukhina M A , Osintsev Ya A , Yu Shadrin E 
Published: November 2019

Abstract
Gas-droplet flow at diesel fuel spraying by superheated steam jet has been experimentally investigated in this work with the use of interferometric method (IPI). Data on the dispersed composition of the steam-fuel jet have been obtained in a wide range of operating parameters (steam and fuel flow rates) corresponding to the area of stable operation of the burner. Dependences of droplet sizes in the flow on the regime parameters have been established.
Explosive vaporization of water-based nanofluid on a flat microheater
Authors: Kozulin I A , Kuznetsov V V 
Published: November 2019

Abstract
The explosive vaporization of the nanofluid formed by water and SiO2 nanoparticles on a heater with the size of 100×110 μm was studied. In experiments, the reflected optical signal produced by heater lighting using laser beam was measured. The patterns of the initial stage of the nanofluid explosive vaporization were obtained and the effect of nanoparticles on the nucleation temperature was discussed. The variation of the nucleation temperature and vaporization time depending on the temperature increase rate was defined.
Dynamics of propagation of a self-sustained evaporation front on the flat and cylindrical heaters
Authors: Zhukov V E , Moiseev M I , Yu Slesareva E 
Published: November 2019

Abstract
The paper presents the results of experiments on freons R21 and R114 and their mixtures. The variation range of volatile component concentration is 0 <C <1. The propagation velocity of a self-sustaining evaporation front was studied. The experiments were carried out under the conditions of free convection at a temperature of saturation. The stainless steel tubes with the diameters of 3 and 8 mm and a flat section of 25 x 50 mm were used as the working sections. The experimental results showed that in the field of development of hydrodynamic instability of a vapor front, a higher velocity of front propagation corresponds to a higher concentration of volatile component. Experiments with different heater geometry showed that dependence of the evaporation front velocity on the temperature head for a cylindrical heater with a diameter of 3 mm almost coincides with the dependence for a flat heater. In the region of temperature heads corresponding to the loss of hydrodynamic stability of the evaporation front interface, an earlier development of instability is observed on a heater with a diameter of 8 mm.
Experimental study of heat transfer in a heat pipe
Authors: Cheverda V V , Ronshin F V 
Published: November 2019

Abstract
Heat pipes are a promising cooling system due to the fact of high efficiency and non-availability of moving parts such as pumps. The experimental investigation of heat transfer in a flat heat pipe has been carried out. The temperature field on the heat pipe has been evaluated using an infrared camera and K-type thermocouples. The IR-camera data and K-type thermocouple data have been compared. The linear dependence of the power supplied to the evaporator on the temperature difference between the evaporator and the condenser is shown.
The effect of viscosity on rupture dynamics in the non-uniformly heated horizontal liquid film
Authors: Kochkin D Y , Zaitsev D V , Kabov O A 
Published: November 2019

Abstract
In the present work, we study the rupture dynamics of a horizontal liquid film non-uniformly heated from below in a wide range of liquid viscosity. To visualize the liquid surface deformations and disruption of the film, we use a Nikon digital camera (shot at 60 fps) coupled with an optical schlieren system. In order to measure the instantaneous film thickness, we use the confocal Micro-Epsilon chromatic sensor. It was found that the process of film rupture can be divided into three stages: 1) film thinning down to a residual film on the heater; 2) existence of a stable residual film for some time; 3) rupture and dryout of the residual film. The thickness of the residual film was found to strongly depend on the liquid viscosity: for water, it is about 10 µm, whereas for PMS-200 it is about 275 µm.
HEAT TRANSFER AND HYDRODYNAMIC CHARACTERISTICS AT EVAPORATION OF LIQUID FILM IRRIGATING A HORIZONTAL BUNDLE OF FINNED TUBES
Authors: Gogonin I.I. 
Published: November 2019

Abstract
The paper presents experimental results on heat transfer during evaporation of an R21 freon film that irrigates a packing of horizontal finned tubes. It is shown that heat transfer on the finned tubes is noticeably more intense even with respect to the full surface of the finned tube.
Pulmonary adenocarcinoma characterization using computed tomography images
Authors: Huérfano Y , Vera M , Vera M I , Valbuena O , Gelvez-Almeida E , Salazar-Torres J 
Published: November 2019

Abstract
Lung cancer is one of the pathologies that sensitively affects the health of human beings. Particularly, the pathology called pulmonary adenocarcinoma represents 25% of all lung cancers. In this research, we propose a semiautomatic technique for the characterization of a tumor (adenocarcinoma type), present in a three-dimensional pulmonary computed tomography dataset. Following the basic scheme of digital image processing, first, a bank of smoothing filters and edge detectors is applied allowing the adequate preprocessing over the dataset images. Then, clustering methods are used for obtaining the tumor morphology. The relative percentage error and the accuracy rate were the metrics considered to determine the performance of the proposed technique. The values obtained from the metrics used reflect an excellent correlation between the morphology of the tumor, generated manually by a pneumologist and the values obtained by the proposed technique. In the clinical and surgical contexts, the characterization of the detected lung tumor is made in terms of volume occupied by the tumor and it allows the monitoring of this disease as well as the activation of the respective protocols for its approach.
Economic growth in Norte Santander, Colombia, and the effects of the armed conflict
Authors: Miranda M D J Zambrano , López D J Manzano , Pinzón Solano C H , Alvares M Pontón 
Published: November 2019

AbstractThe objective of this work is to estimate the armed conflict effects on the economic growth of Norte de Santander from 1988 to 2012; starting with an economic characterization and some aspects of the armed conflict in the period 1988 - 2012, through an econometric model, according to Cobb-Duglas function from the Solow-Swan model. The Department has experienced volatile economic growth with weaknesses in its productive development, and that has been very important by the armed conflict leaving a humanitarian tragedy. The econometric results show that the appropriation of illegal income by armed groups outside of the law, and the guerrilla attacks on infrastructure have negative effects on economic growth, while public spending has a positive relationship with the growth, it is expected that this work will contribute to the debate for the post-conflict scenario, and that it will serve as input for the development of public policy in the department, and mostly the importance of peace for the economy.
Impacts of the mathematical clinic in the academic performance of the students
Authors: Santiago-Carrillo M C , Vergel-Ortega M , Parra-López H M 
Published: November 2019

Abstract
The article present the scopes of the pedagogic model called “mathematical clinic” evaluated in students of fourth and fifth grade of the “Escuela Sagrado Corazón de Jesús, San José de Cúcuta, Colombia”, which has as principal aim analyse the impacts that the initiative had in the rate of academic mortality, those who on not having graduated of primary with an appropriation consolidated of the mathematics have difficulties in their performance during the following years. The methodology of the study is quantitative, correlational, since from the assistance, approval and disapproval his incident is calculated in the performance of the pupils. The results reflect high correlation, where the clinic has turned into a space effective learning in the institution into that students strengthened their interest for the different areas of knowledge.
Problem solving strategy in the teaching and learning processes of quantitative reasoning
Authors: Barrera D , Salazar-Torres J , Vera M , Gelvez-Almeida E 
Published: November 2019

Abstract
The study presents an analysis of Polya’s problem-solving strategy used in the training processes of quantitative reasoning competence in students of the Universidad Simón Bolívar, San José de Cúcuta, Colombia. The research was based on a descriptive design and had an intentional sample of 58 students who were studying the sciences and general competencies elective. For the collection of information, a diagnostic test (pre-test) and a final test (post-test) were applied, in order to check the incidence of the applied strategy. The results showed a significant improvement in the final results obtained by the students in each of the processes formed: interpretation, representation and modeling, and argumentation.
Learn by doing as a didactic strategy through the codecademy web portal in pedagogical practice to promote creative thinking and significant learning in students
Authors: Gómez Mendoza F A , Gallardo Pérez H J , Villamizar Jaimes D 
Published: November 2019

Abstract
The work developed is action research type, framed in the qualitative paradigm. It designs a didactic strategy for the development of a different pedagogical practice to the traditional one that allows a greater autonomy in the student during the learning process, since the apprehension of knowledge is done in a more personal and practical way. The didactic proposal is developed from the diagnosis of the student’s creativity and their ability to interact with academic platforms. Its implementation allows the student to learn by doing in a process of trial, error and correction in order to promote creative thinking while achieving meaningful learning.
Strategic direction aligned with information technologies for secondary education in Ocaña, Colombia
Authors: Velasco Burgos B M , Muñoz W S , Arévalo Sánchez L 
Published: November 2019

Abstract
Faced with the need for secondary education institutions in Ocaña, Norte de Santander, Colombia to have the strategic information technology plan for the efficient achievement of educational management objectives, the present study of quantitative approach and descriptive, which allows, through the integrated information technology scorecard model, the design and application of a generic technological tool and the organization of an information technology area to support in the control and evaluation of pedagogical, financial and capital variables human of these institutions.
Summary of the internet of things and its application in agro-industrial production
Authors: Rodríguez D M , Bayona E , Rosado A A 
Published: November 2019

AbstractThe internet of things, day by day accompanies the development of activities that are executed in any space, through remote access. Households and companies have included new technologies in different areas for the automatic development of activities or processes, real-time monitoring and control, which has become a pressing need for decision-making, For this reason, it is necessary to carry out a bibliographic review, by searching for scientific articles, in the most recognized digital databases, where the most important aspects of the internet of things, technologies and elements used in the last ones are mentioned years, in order to know a little more about these and their characteristics in common. For the investigation, the recommendations and analysis of the results obtained in case studies will be taken into account, seeking to leave a precedent that contributes to the improvement of the agro-industrial production processes, so that they are supported in new technologies that allow identifying, measure and control variables, that achieve the efficient operation of resources, maximizing the potential of their characteristics.
Identification of conditioning and triggers factors of mass removal processes in the city of Ocaña, Colombia
Authors: Gallardo R J 
Published: November 2019

Abstract
The occurrence of mass removal phenomena has generated large losses in economic, infrastructure and human lives in various parts of the world. These events are closely related to the anthropic intervention that is made to areas of high geomorphological susceptibility. The Municipality of Ocaña, Norte de Santander, Colombia, is no stranger to this problem because its hillside areas, especially those of the urban perimeter, are very susceptible to suffer from landslides, due to topography, geomorphological susceptibility, soil conditions, deforestation levels, winter periods and above all the incessant growth of human settlements made up of displaced and rural population seeking better living conditions in the city. The purpose of this research is to have more detailed information on the conditioning and triggering factors of the problems due to phenomena in mass removal that present the hillside areas of the city of Ocaña, Colombia.
Voided Biaxial Slabs - State of Art
Authors: Ismael Adil Ahmed , Hejazi Farzad , Rashid Raizal S. M. 
Published: November 2019

Abstract
A bubble deck slab is a technique of realistically disposing the concrete in the center of the slab, which does not perform any structural role, thus significantly reducing the dead weight of the structure. High-density hollow voids of polyethylene replace the actual concrete in the middle of the slab, as a result reducing the dead load and productivity of the slab will be increased. This paper reviewed the numerous studies have been prepared on voided biaxial slab system. conventional Slab are a standout amongst the most widely recognized parts in present day building development devouring a large portion of the concrete. The Advantages are lower power as comparison consumption than conventional slab - in both production, transport, emissions gases especially CO2 and reducing materials, load, cost reduction and it is ecological structure element. A range of recycled plastic bubbles allows columns spacing of 50% without any symptoms. This offers a wide range of benefits and construction cost. The bubble system usually combines the benefits of the industrial elements in the controlled conditions with the completion of the final concrete site, leading to a finalized floor slab.
Review paper on development of interactive user guideline for finite element software
Authors: Hairum Haqimah , Hejazi Farzad , Rashid Raizal S. M. , Saleh Jaafar M. 
Published: November 2019

Abstract
Due to the rise of diverse finite element software, the needs to understand each of the software interface for optimization of the software usage is increasing among new users. Many researchers had roughly done their software explanation through a few simple methods such as clarifying the software user interface and framework to enhance user benefit with their software. They also provide conclusion for the explanation with a proper justification of an analysis or through interviewing user experiences. The three steps had been proven to be effective in term of giving recognition of software to new users with different background field. This paper will review the standard definition of a graphical user interface that many existing finite element software had completed and how it was exposed to the user. Also, how the software framework function for user to obtain a reliable data out of it and finally the validation of the enlighten framework and GUI for users ease in each model analysis.
Evaluation of restrainer effects on bridge response subjected to dynamic loads
Authors: Paknahad Masoud , Hejazi Farzad , Abdulhussein Yasir Samer , Azarkerdar Arash 
Published: November 2019

Abstract
Highway bridges in seismic prone areas suffer a serious structural issue when subjected to a severe earthquake, which are the longitudinal hinge displacements. The hinge displacements might put the structure integrity in jeopardy when they exceed certain limits. High hinge displacements can cause fatal effects on the bridge structure including; bearing failure, unseating, and pounding of the adjacent superstructure decks. The aim of this study is to implement a numerical model which characterize the standard properties of a highway bridge and put it under a high intensity seismic excitation to examine its response. Then attempting to enhance the structure response using cable restrainers as means of displacement control. A parametric study is to be performed to investigate the effect of the restrainer material properties (Stiffness and Effective damping) on the efficiency of the cable restrainer in performing its intended purpose. The bridge was modelled and analysed using CSIBridge® finite element package. The obtained results have demonstrated a hazardous response of the bridge without the cable restrainer. However, a significant control capability was observed when applying the cable restrainer. Moreover, the parametric study has shown that, the performance of the cable restrainer is closely related to its stiffness as the stiffness value significantly contributes to displacement control and response stabilization. On the other hand, the effect of the effective damping value on the overall response was limited. Optimum cable restrainer have be chosen based on the parametric study and implemented to the model. The response was compared to the initial response without the restrainer. Eventually, the use of the cable restrainer had provided an impressive efficiency on displacement control and response stabilization.
Compressive strength of class F fly ash blended geopolymer- hybrid mortar
Authors: Almufarji M J , Hejazi Farzad , Al-Attar Alyaa.A. 
Published: November 2019

Abstract
Day by day construction industry require large amounts of cement to satisfy development of buildings, facilities and infrastructures, that demand presented undesirable increase in CO2 emitted the environment as 1 ton of cement produce approximately 1 ton of CO2. Aiming to reduce usage of Portland cement new technology of binders was researched such as Geopolymer binders. General composition of geopolymer contain aluminosilicate source materials such as fly ash or fly ash combined with GGBFS, and alkaline activator such as a mixture of sodium hydroxide (NaOH) and sodium silicate solution. However, geopolymers suffer from some limitations such as the variation in chemical content, the calcium content, dosage of alkaline activator and Na2SiO3/NaOH ratio, additionally geopolymers has brittleness and low toughness which require additional materials to mitigate normally some sort of reinforcement fibres which can drive the cost very high. The objective of this research is to investigate the enhancement in compressive strength of geopolymer mortar by incorporating Ground Granulated Blast Furnace Slag (GGBFS) with class F fly ash in blended geopolymer, also the addition of commercial grout to form blended geopolymer–hybrid mortar. GGBFS replaced fly ash by 10%,20% and 30% of total mass, and commercial grout then was added by 10%,20% and 30% to each blended mixture. All samples where cured in ambient temperature. It was found that incorporating GGBFS and commercial grout increase the compressive strength in early age of curing and slightly at 28 days. Furthermore, 10M concentration of NaOH yielded the highest strength with the blended geopolymer-hybrid mortar.