bluuebunny/crossref_metadata_2025 huggingface dataset:
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

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

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

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

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

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

The 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

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

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

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

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

The 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

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

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

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

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

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.
A review on waste materials usage as partial substitution in self-compacting concrete
Authors: Law A S L , Koh K H , Hejazi F , Jaafar MS
Published: November 2019

Concrete is the main component in construction which made with the present of cement, water, fine and coarse aggregate. However, conventional concrete suffer from certain deficiencies due to commercial application in construction. In order to overcome the constructability of highly congested reinforced concrete elements, self-compacting concrete is developed. Self-compacting concrete is a type of special concrete which designed to flow into the formwork without any mechanical vibration and possess the ability to consolidate by its own weight without suffering segregation. Common solution for waste disposal is the utilization of waste materials in concrete. Thus, in this review paper the advancements in developing self-compacting concrete by using waste materials such as silica fume, ground granulated blast furnace slag, fly ash, plastic wastes and recycled concrete aggregates were studied to evaluate their effect on concrete behavior.
Application of waste from steel industry to construction material: A Review
Authors: Mamdouh A. , Azizi Safiee Nor , Hejazi F. , Azarkerdar Arash
Published: November 2019

Concrete is material which widely used in construction projects because it has many advantages and is an inexpensive material, durable and can be molded into any shape. On the other hand, concrete has some disadvantages due to the brittle nature which made concrete also suffers from sudden failure. However, the routinely creating enthusiasm for materials by the construction business can’t be totally faced by regular resources or traditional materials. Henceforth, there is a need to create elective potential materials and innovative methods to fathom the growing requests of building development. For this reason, some research introduced Slag as ecofriendly and natural materials to reinforce the concrete. Therefore, in recent years, it has concentrated on discover alternative techniques for outline, development, and support with the motivation behind delivering naturally benevolent structures. This study will present a short review on the steel slag which covered the basic chemical characteristic and also, the potential of steels slag as an alternative building material in construction. Furthermore, discussing from the manageability perspective, the recuperation of slag is certain from all viewpoints: economically, environmentally, and socially as construction material. Therefore, this paper summarizes the progresses and points out the directions for the proper use of steel slag.
Water leak detection method in water distribution network
Authors: Ahmad Fuad Z. , Eddy H. S. , Badronnisa Y. , Syazwani I.
Published: November 2019

Leakages attribute to one of major component of which is of major problems in water industry. Today water leakages issued are listed in top priority in many water operator worlds widely. This study provides review of the leak detection method and technology. Leakages cause a massive cost economically and operationally. Leakages also a sign of water operator operationally efficiency. Therefore, this topic has attracted a lot of attention by the academician researcher or water industry expertise over the past years to study and lastly to invent latest technology is ease operation. In need to find the fast result and economical to determine the leakage. There are many methods to detect a leakage such as sound, acoustic, vibration, sensor, pressure, etc. We herewith studied as many useful research papers in this field and trying to address the available method to detect the leakages. Leakages will lead numeral of customer’s complaint and will reflect negative perspective of water operator operational efficiency. Hence, consumers are being the sensor to leakages that happens throughout the networks. Current technology integrated with the engineering principle, using sensors to monitor distribution networks are most recommended method and will ease the monitoring of water network systems. Real time-based sensors will notify any incidence and the algorithm will forecasted leakages before the its been visualised and notified. In this review shall include the real time-based leak detection method and wireless water network technology for references.
A Comparison Between Support Vector Machine (SVM) and Convolutional Neural Network (CNN) Models For Hyperspectral Image Classification
Authors: Hasan Hayder , Shafri Helmi Z.M. , Habshi Mohammed
Published: November 2019

This study presents a methodology model for the spectral classification of hyperspectral images. The applied methodology, first extracts neighbouring spatial regions via a suitable statistical support vector machine (SVM-Linear) architecture, support vector machine radial basis function (SVM-RBF) and Deep Learning (DL) architecture that comprises principal component analysis (PCA) and convolutional neural networks (CNN) and then applies a soft max classifier. PCA is introduced to reduce the high spectral dimensionality, noise, and redundant information of the input image. The SVM-Linear, SVM-RBF and CNN model is used to extract useful high-level features automatically given that it provides results comparable with each other, including hyperspectral image classification. However, because the CNN, SVM models alone may fail to extract features with different scales and to tolerate the large-scale variance of image objects, the presented methodology uses PCA optimization for spatial regions to construct features that can be then used by the SVM and CNN model to classify hyperspectral images. Experimental results obtained in the classification of the Hyperspec-VNIR Chikusei datasets show that the performance of the presented model is competitive with that of other DL and traditional machine-learning methods. The best overall accuracy of the presented methodology for the Hyperspec-VNIR Chikusei datasets is 98.84 % in SVM-RBF model.
A study on the constraints of implementing Information and Communication Technology (ICT) in Malaysian Construction Industry
Authors: Lew Y L , Toh T C , Lim K L , Yan F Y Y , Yow L P
Published: November 2019

Information and Communication Technology (ICT) refers to a combination of hardware, software and communication facilities. Often, ICT is introduced to equip construction stakeholders with information and analytical tools for a better control throughout the entire construction delivery process. The aim of this study is to investigate the issues relating to implementation of ICT in Malaysian construction industry with the objectives of: (i) to identify the benefits of adopting ICT in construction industry; (ii) to determine the constraints of implementing ICT in construction industry; and (iii) to identify the methods to encourage construction industry in adopting ICT. A questionnaire survey was conducted in Johor and Klang Valley of Malaysia, a total of 70 completed questionnaires were collected from contractors and quantity surveying consultation firm. Based on the analysis conducted, the top three benefits of adopting ICT in Malaysian construction industry ranked by the respondents are improvement on accuracy of measurement works, minimization on usage of paper by digitalization and allowed rapid sharing of information among project team. The barriers in implementing ICT in Malaysian construction industry identified included unaffordable initial capital and long term investment required, difficulties encountered to recruit capable and trustworthy in-house IT specialist, and security issues on confidential issues. Training and vendor’s efforts to improve their software have been agreed as the most achievable and practical methods to encourage ICT uptake. This study had explore the implementation and acceptance level of ICT in Malaysian construction industry. The views from both contractor and quantity surveying consultation firm were revealed. The findings from this study could be used as the baseline for future development of ICT in the local construction industry.
Motives for solar photovoltaic (PV) adoption in urban Nigeria
Authors: Ugulu A I , Aigbayboa C
Published: November 2019

Microgeneration technologies like residential solar photovoltaic (PV) systems have been shown to have immense potential for energy security and climate change mitigation. At over 50% private power systems ownership, the majority of urban Nigerian households rely on conventional self-generation utilising expensive petrol and diesel-powered generators. Despite the high upfront costs of a sizeable PV module, some households are choosing such sustainable alternative power. This paper investigates the motives for PV adoption in urban Nigeria following innovation diffusion and adoption theories. Using interviews, PV adopter data were collected on key drivers for uptake and results analysed. Field survey analysis established the key motives for uptake as power outages, energy cost-savings, including generator use fuel fraud, awareness and access to finance while key barriers include high capital costs and lack of finance. The results point to the need for regulatory and political intervention. Effective PV awareness creation campaigns and promotional strategies would also be necessary in the changing face of electricity supply in Nigeria.
Malaysian Urban Residents’ Readiness to Reduce Car Usage and their Perception on Non-Motorised Facilities.
Authors: Nasrudin N , Marzukhi M A , Abdullah Y A , Khalid N S , Abdul Wahab M
Published: November 2019

The research in this paper tries to establish the readiness of urban residents’ in Malaysia to minimize the car usage and their inclination to use non-motorised transport, such as cycling and walking, as alternatives to using a car for commuting. This study also tries to measure the perception of the residents regarding the existing scenario of walking and cycling infrastructure facilities provided in their cities. The data used in the study was collected through a survey in three cities, namely-Shah Alam, Batu Pahat, and Putrajaya, as a representation of the main cities in Malaysia. The results produced suggested- the majority of the population was not ready to give up travelling via car and take up cycling and walking in lieu of it. The causes listed for “refusal” of reducing the car usage included hot weather, surrounding safety concerns and undesirable pedestrian and cycling infrastructure conditions. The research explored that attitude, lifestyle and high level of dependency on cars are crucial factors dictating the travel behaviour, which is the reason why residents refuse to shift to sustainable and environment friendly options of travel. The research also suggests that these three cities need to improve and uplift their walking and cycling infrastructure facilities, especially in terms of provision of cover and shade, connectivity, design and maintenance and cleanliness to motivate the urban residents to minimize usage of the cars and take up walking and cycling instead.
Modular Construction System (MCS) in Malaysia: Mass Customization Through Combinatorial
Authors: Aziz S , Che Mohd Nasir S N , Hatrom R , Ahmad Bazuli L , Abdullah M R
Published: November 2019

Combinatorial is another sub-topic and sub ordinate of Golden Mean theory. This paper is part of on-going research of modular construction system (MCS) in Malaysia. Objectives of the research were to propose an appropriate scheme and concept for sustainable design for modular home based on research findings.The researcher conducted case study (Personnel Expert Interviews) to collect data of MCS in Malaysia. Proposed combinatorial design for spatial planning of home design has been carried out by the researcher at the end of analysis as design experimental yet need validation from computer science experts. Combinatorial in modular architecture is the theory of conceptual design for future building design process of MCS. The researcher discuss in details and to clarify the proportion combinatorial for MCS in aspect of building forms and arrangements through proposed combinatorial formula. In Malaysia, design technique should relate to local culture, weather, and available materials sources as mentioned by the experts. Combinatorial design of modular architecture is an alternative design for compact affordable home. This combinatorial geometry (3D module) repeated, duplicate and can be oriented in a few ways to forming combinatorial models of building design. Pattern A and B are considered to be the best in economic aspects and practicality in term of shape of green. Proposed concept possibly can improve user decision making (digital design process) e.g. building players to plan their building lifecycle projects in term of economical design, green shape, reduced construction time and cost. Thus, it may be able to promote user friendly design, fast track construction, and quality based product, less wastage and varied of design selection can be chosen of the user.
The Elderly (Senior) Housing Options Preferences Among Malaysian Generations
Authors: Ismail Hafiszah , Aziz Fatin , Abd. Wahab Maszuwita
Published: November 2019

Trends of changing demographics would greatly grant impact on the supply and demand for housing. Different types of populations or generations equipped with different needs and preferences which award basis for more studies mainly on the relationship between population and housing. Relevantly, the numbers of senior (elderly) population currently increasing and projected to persistently increase due to the enhancement of the health quality and lifestyle. Despite the soaring fraction of the elderly moving to a nursing home or retirement community with increasing age, the majority of the elderly age 85 and over still want to stay in their own homes (Ngarmyarm and Panichpathom, 2012). Thus, studies on senior (elderly) housing options preferences were significant to guarantee enhanced future housing provisions for this aged population. The main objective of this paper is to give an overview on the concept of aging-in-place and the preferred elderly (senior) housing options for the Malaysian generations (Baby Boomers, Generation X, Generation Y, and Generation Z). This study employs mixed methods approaches with Selangor as a case study. A sum of 1,067 respondents was contacted through drop-off, face-to-face interview, postal interview and internet survey (web-survey). The findings show that the Malaysian generations accept the concept of Retirement/Age-Restricted Community with health-care services.
Challenge of Renewable Energy Transition towards Krabi’s Sustainable Energy City
Authors: Senpong Chariya , Wiwattanadate Dawan
Published: November 2019

This paper is a review article collecting relevant data and information for developing a transition model towards a sustainable energy city: a case study of Krabi Province, Thailand. An expanding tourism sector in Krabi is increasing energy demand, which continues to grow year after year. Meanwhile, the energy supply of the province relies on the centralization of the southern and central regional energy system to the national grid transmission system. According to the 2018 National Power Development Plan, Krabi is projected to shift to regional grid decentralization; coupled with increasing its power generation from renewable energy with affordability and community participation. Therefore, Krabi Vision 2020, which is a provincial master plan, would lead the direction of Krabi’s plan towards energy transition. Increasing renewable energy investment and disruptive technology to secure the potential of solar, biomass, biogas, wind and mini-hydro is paving the way to shift Krabi to a sustainable energy future. The implementation of a sustainable energy transition across the province, would bring benefits for the local economy, environmental conservation, and energy security. To achieve this energy transition, Krabi requires coordination of smart policy, local and government participation, and sound planning. This review study suggests that the transition towards a sustainable energy future depends on identifying the political barriers, and the adoption of effective management practices.
Optimization of well gas rates for offshore gas-condensate field
Authors: Ermolaev A I , Nekrassov A A , Trubacheva I A
Published: November 2019

Condensate recovery enhancing on offshore gas-condensate fields cannot be realized using the cycling process due to significant financial costs and technical difficulties. Such a problem could be handled by the redistribution of well gas rates. This redistribution assumes the solution the following problem: maximize the total condensate production at a given time interval then gas production requirements are met. The results of solving the problem are functions, each representing the change in the well gas rate over the time. The problem is transformed to the linear optimization model so that the solution algorithms based on the linear programing theory can be applied. Their tests showed, that these algorithms easily find the solution of the optimization problem; and the condensate recovery is greater or equal than the one obtained by the optimization procedures implemented in Eclipse. The search time is an order of magnitude less than the one required by Eclipse.
Assessment of jacket-type platform stress state in corrosive environment: Case study
Authors: Starokon I , Ermakov A
Published: November 2019

The structural tubular elements of the offshore platform substructure work in combined conditions of bending, tension, compression and torsion loading. Evaluation of the platform stress state is an important task. Effective solution of which can be received by a CAD modelling. The real stress state of the structure depends on the characteristics of corrosion processes. Therefore, corrosion defects should be taking into account for numerical and analytical modelling to determine/predict actual state of stress of bottom fixed offshore platforms. The stress concentration factor is the real characteristic of stress value for the structural elements of the platform in the zone of corrosion. The paper deals with the methods of the actual stress state calculation for the structural elements and welded joints of stationary platform under corrosion. The features of corrosion defects are also a subject of analysis. The proposed a calculation method of stress concentration factors for the primary tubular members of platform substructure in condition of corrosion.
Synthesis and characterization of fly ash and slag based geopolymer concrete
Authors: Kallesten B , Kakay S , Gebremariam K
Published: November 2019

This paper presents the formulation and characterization of composite fly ash and slag based geopolymer concrete. Potassium hydroxide (KOH) and potassium silicate (K2SiO3) liquid alkaline activators were used in the preparation of the geopolymer concrete. The mechanical response of the best recipe was investigated through compressive, tensile and flexural strength tests after 3, 7 and 28 days of curing. One batch was tested for compressive strength after 16 and 32 weeks of curing. The microstructure of the concretes was characterized using scanning electron microscopy (SEM). The testing results are compared with a reference ordinary portland cement-based concrete. After 28 days of curing, test results showed that the geopolymer concretes can approach the compressive strength of the reference ordinary concrete. Moreover, the tensile strength and flexural strength attained reached up to 68% and 80% of the reference cement, respectively. The results indicated the potential application of geopolymer that can satisfy the standard strength requirement. After longer time of curing, 32 weeks, some of the geopolymer preparations exhibited 111% compressive strength, compared to the ordinary cement reference.
The influence of the composition of water on the results of accelerated aging resistance testing of low voltage subsea cables insulation
Authors: Erfurth R , Gudmestad O T
Published: November 2019

The composition of water changes with temperature, for instance, the saturation rate of water in polyurethane membranes is related to the temperature. Thus, it is necessary to evaluate the influence of the composition of water on absorption of water in subsea cable insulation. This paper is suggested to represent a supplement to existing standards regarding “Electrical insulation materials - properties with regard to thermal long-term behaviour.”
Application of multicriteria fuzzy clusterization approach to assess the arctic seas oil and gas field development prospects
Authors: Pivovarov K N , Zolotukhin A B , Streletskaya V V
Published: November 2019

The article describes a unified approach to the assessment of resources and business planning. As an example, the oil and gas resources of the Pechora Sea are considered in the paper. Based on the specifics of the problem (the quantity and quality of the available data and their nature), the methods of multicriteria fuzzy clusterization are used. The assessment of the prospects for the development of oil and gas fields was carried out using 3 criteria, namely: availability of resources (natural and climatic conditions of the region); hydrocarbon resources and their degree of exploration; economic assessment of the development. The results of such an analysis are presented in the form of maps of the Pechora Sea area, illustrating the most important and accessible areas and the sequence of their development. Such a stepwise development based on minimizing the risk and maximizing the benefits can be the basis for the successful and trouble-free development of the resources of the entire region.
Digital transformation of gas production
Authors: Dmitrievskiy A N , Eremin N A , Stolyarov V E
Published: November 2019

The development of the digital transformation of the gas industry in the Russian Federation is mainly aimed at unique and giant fields. These fields provide the leading position of Russia in the world gas market and about 85 % of the total volume of gas production. The regulatory and technical base, the composition of the existing standards allows us to move to the practice of introducing digital gas technologies. The creation of a unified integrated model is being completed at the Bovanenkovo field. The creation of a digital twin of a unique gas field represents the transfer of a real field into virtual space through the use of Big data analytics and supercomputer technologies.
Proposals on 3D parallel edge-preserving filtration for x-ray tomographic digital images of porous medium core plugs
Authors: Arsenyev-Obraztsov S S , Volkov E A , Plusch G O
Published: November 2019

Precise estimation of the effective petrophysical characteristics for the oil or gas-bearing reservoir plays a vital role in production control problems. It is preferable to use nondestructive measurement methods for porosity, conductivity, geomechanical modulus, and some other parameter fields. For the estimation of anisotropic permeability tensor flows in different directions need to be simulated in the core plug digital image void space, which is very difficult (if possible) to conduct with the real rock sample. The creation of the digital core image includes three stages: construction of its internal structure based on the computed tomography (CT) sinogram, filtration, and segmentation. Routine practice is the filtration of 2D slices pack of the core plug CT image because of a lack of computational power and memory limitations. Unfortunately, this can generate a directional orientation error orthogonal to the pack of slices. The total 3D edge-preserving filtration with the usage of two approaches: modified implicit anisotropic diffusion and discrete orthogonal transforms can reduce this error. Universal code based on the MPI+OpenAcc programming paradigm was tested on different high-performance computing systems incorporating various accelerators like GPGPU and heterogeneous processors such as Sunway 26010.
Integration of expert and data-driven workflows to manage reservoir and well life cycle in Arctic conditions using innovative SICLO methodology
Authors: Antonic M , Solesa M , Zolotukhin A B , Rakic D , Aleksic M
Published: November 2019

SICLO (Source of data and information; Input data; Calculation/Analytic; Logic Analysis; Output/Value Delivery) methodology is an innovative concept for smart diagnostic, reservoir/well performance optimization and estimation of remaining reserves based on the integration of Petroleum Data Management System (PDMS) and expert rules. Implementation of SICLO methodology provides the best strategy on how to produce remaining reserves most profitably. PDMS is the foundation of SICLO methodology and provides structured and verified information that follows the Well Life Cycle. Within PDMS, data are organized and structured according to clearly defined principles and rules and filtered by different levels of quality control. Structured data allows integration of production and reservoir information with real-time data to achieve the maximum level of diagnosis of system operation performance according to reservoir and well potentials and system constraints. The built-in workflows and architecture of the whole process are automated and make the task accomplishment faster. SICLO methodology integrates expert-driven knowledge and pattern recognition tools improved by data-driven, artificial intelligence, neural network, and fuzzy logic technologies to deliver adaptive solutions for identifying locations of remaining reserves, optimizing oil and gas production, and minimizing associated operational costs.
Comparative study of wax inhibitor performance for pour-point reduction of oil from Sirikit Oilfield in Thailand
Authors: Maneeintr K , Jongkittinarukorn K , Boonpramote T
Published: November 2019

In petroleum industries, waxy crude oil is normally found in petroleum production. Wax formation and precipitation during pipeline transport of waxy crude oils can cause several challenges, including wax deposition and flow reduction which adversely impacts pipeline performance in oil and gas production. To overcome the wax deposition problem, the small amount of chemicals like wax inhibitors can provide an effective preventative measure. One of this mechanism is to reduce the pour point temperature. In this work, oil from Sirikit Oilfield in Thailand is selected for this study. The wax inhibitors are selected and studied the performance for pour-point reduction. These chemicals are Polyalkyl methacrylate (PAMA), Poly(maleic anhydride-alt-1-octadecane) (PMAO), Polyalkyl methacrylate-co-ethylene glycol (PAMAEG) and Copolymers of maleic anhydride (CPMA) with the concentration ranging from 100 to 1000 ppm. Also, n-pentane with the concentration of 5-20 % by weight is used as a solvent for wax inhibitors. The results from this study show that n-pentane can reduce the pour point to 39.41 % compared to the original oil. Furthermore, among the polymer group, PMAO can reduce the lowest pour point to 52.82 %. In addition, the mixed solvents of polymer with n-pentane can provide relatively less effect on pour-point reduction. The mixture of n-pentane with PMAO can lower the pour point to a certain level of 54.96 % compared to the original oil. This study can be applied to use in the real field to prevent wax deposition in the pipeline transportation for oil production.
Scalability and compatibility analyses of airborne wind technology for maritime transport
Authors: Domínguez Santana D A , El-Thalji I
Published: November 2019

Wind energy is a source freely available in the oceans. New developments in the wind industry are towards high altitude wind turbines, known as Airborne Wind Energy Systems. The airborne wind technology is rapidly developing with several different design concepts, e.g. Skysail, Makani, KiteMill. There are mainly two types of airborne wind technology: propulsion-supporting and electricity-generating. Electricity generating airborne technology is mainly used for land-based buildings and fixed offshore structures and with small-scale airborne turbines. Thus, the applications of this technology in the maritime industry are limited to ship propulsion-support only and no scalable airborne wind turbine is used on board of a vessel. Therefore, the objective of this study is to explore the application of electricity-generating airborne turbines on the board of a ship. The exploration is mainly to determine how scalable these turbines shall be to satisfy a ship’s electricity needs and how compatible the design of these turbines can be with the ships design. . Therefore, a scalability analysis based on crosswind kite power model is applied to determine the technical requirements to scale up the existing airborne turbine to meet the electricity demand of a ship. Moreover, a compatibility analysis is applied to determine the technical interfaces and constrains between the airborne turbine configuration and the ship architecture. In this case, a commercial electricity-generating airborne turbine and a commercial floating storage unit are considered as part of the case study. The developed scalability model indicates that the traction force is the most critical design parameter to scale up a wind turbine. On the other hand, the developed compatibility model shows that there is a notorious complexity in merging airborne and ship technology due to their contexts. Consequently, this research appears to be relevant for both, the airborne technology industry and the maritime industry toward more innovative and cost-effective applications.