bluuebunny/crossref_metadata_2025_split huggingface dataset:
Changes in formation pressure and technological efficiency of unsteady flooding in double permeability reservoirs having different productivity rates
Authors: Almukhametova E M , Soloviev N N 
Published: November 2019

Abstract
Unsteady waterflooding went through several stages. Within the pilot works in April 2009, cyclical water injection was started in Block 7 (central section). In addition, alternate water injection into the horizons of the Jurassic and Cretaceous sediments of Block 10 began. For this purpose, injection wells equipped with devices for simultaneous separate water pumping were used. The significant effect of non-stationary waterflooding in the experimental sections allowed for the application of the technology in other blocks. The technology implementation scheme was applied for injection wells of Blocks 6 and 10. Since July 2010, cyclic injection has been used for many wells. Periods of non-stationary operation of injection wells were determined experimentally. The reservoirs with heterogenous permeability containing highly permeable and low-permeable layers are the most optimal ones. The heterogenous structure of the reservoir provides a large contact area between layers with different permeability levels which allows for non-stationary effects due to the occurrence of overflows between the layers. It can reduce the water content of the products and increase oil production.
Modeling the processes of substantiation of renewable energy development projects
Authors: Alabugina R A , Zhang Z , Xue W , Ma D 
Published: November 2019

Abstract
The features of the assessment of the economic efficiency of energy saving projects based on the combination of traditional and renewable energy and material resources with an increasing degree of cogeneration of energy types and by-products are revealed. The object of the research is the formed energy-technology complex of objects or the industrial park, and the subject is the modeling of the processes of combining and cogeneration to determine the options for the best organizational and technical solutions in projects for the development of renewable energy. The variants of projects for the transformation and landfill reclamation of an industrial area with a critical level of environmental pollution are substantiated.
Limitations of using phase change materials for thermal energy storage
Authors: Lebedev V A , Amer A E 
Published: November 2019

Abstract
The use of a phase change materials (PCMs) is a very promising technology for thermal energy storage where it can absorb and release a large amount of latent heat during the phase transition process. The issues that have restricted the use of latent heat storage include the thermal stability of the storage materials and the limitation of the container size. The study of the influence of thermal cycling on the properties of PCMs, such as melting temperature and latent heat, is important. It is found that the paraffin wax and fatty acids (e.g., lauric acid, myristic acid, palmitic acid, and stearic acid) have good thermal stability and can be used for solar thermal energy storage applications. However, Calcium chloride hexahydrate (CaCl2. 6H2O) is a good PCM in building applications.
Higher harmonics and limiting thereof in power supply systems of different voltages
Authors: Kostin V N , Serikov V A , Sherstennikova I A 
Published: November 2019

Abstract
The simulation of the modes of power supply systems of different voltages, with a transformer carrying linear and non-linear loads and a capacitor bank, has been implemented. The dependences of the capacitors overload by current and the coefficient of harmonic voltage components on the capacitor bank capacity within the operating range of the transformer total load by linear and non-linear loads have been obtained. For the systems under consideration, upon a daily variation in the capacitor bank linear load and capacity, it is virtually impossible to eliminate the capacitors overload by higher harmonic currents and observe regulatory voltage quality requirements. Anti-resonant chokes installation in the capacitor bank circuits reduces the overload of capacitors to a permissible value, and brings up the coefficient of harmonic voltage components to values that took place in the absence of the capacitor bank.
Vibration state of technical facilities
Authors: Gozbenko V E , Kargapol’tsev S K , Karlina Yu I , Karlina A I 
Published: November 2019

Abstract
Approaches to the management of the vibration state of vibration machines and process flows are considered by introducing additional couplings into the structure of the mechanical system. Based on the structural diagrams, amplitude-frequency characteristics are obtained. The expressions for the minimum amplitude-frequency characteristic are found.
Impact of design capacity on optimal parameters of freight aerial mono-cable cableways
Authors: Lagerev A V , Lagerev I A , Tarichko V I 
Published: November 2019

Abstract
Freight aerial cable roads are an efficient mode of transport in mining industry. The purpose of the paper is to develop the method of optimal design of a mono-cable freight ropeway thus reducing the cost of its construction. It is shown that the pitch and height of intermediate supports, the tension force of load-carrying-traction ropes exerts the main influence on the cableway cost. The problem of conditional nonlinear optimization of the mentioned factors ensuring the minimum cost of a cableway at different design capacity up to 600 t/h is formulated and solved. The optimization task is solved taking into account the necessary design, assembly, deformation and strength limitations. Regularities of change of optimal parameters of intermediate supports and load-carrying and traction ropes at the change of design capacity of a cableway were revealed on the basis of analysis of performed calculations. The results of this optimization task allows significantly reducing the cost of construction of freight aerial cableways.
A review on methods of oil saturation modelling using IRAP RMS
Authors: Tikhomirova E A , Sagirova L R , Khaibullina K Sh 
Published: November 2019

Abstract
Oil saturation is one of the most important characteristics of the reservoir. In the process of geological modelling proper distribution of oil saturation is one of the main parameters for reserves assessment and further flow simulation. The paper presents methods of three-dimensional modelling of oil content of the reservoir based on the results of well log interpretation data, capillarimetry and 3D-trends and algorithms of their realization in reservoir characterization and modelling software suite IRAP RMS, their theoretical basis and application factors.
Identification of the life of mining enterprises in context of reclamation processes
Authors: Kislyakov V E , Bobrov S A 
Published: November 2019

Abstract
The article proposes a methodological approach to determining the full life of mining enterprises, considering the mining and biological processes of land reclamation. It also describes the working area of the strip-pit with elements of stripping, mining and reclamation operations, which predetermine its contour and establish the main parameters of the working area, and the technology of opencast mining in the development of flat deposits. The paper also describes the time (the number, sequence, and duration of the mining and biological reclamation processes at the enterprise facilities) when it is necessary to achieve certain economic indicators based on calculations of mining operations efficiency by year.
The application of thermal gas treatment of the Bazhenov formation
Authors: Sarancha A V , Mikhaylov S.Yu. 
Published: November 2019

Abstract
A large number of publications devoted to the oil production from the Bazhenov formation was published in the Russian scientific and technical magazines focused on specialists in development of oil and gas fields in the last 5 – 10 years. It is connected with the fact that traditional resources of hydrocarbons are gradually reduced, forcing the oil-extracting companies to pay more and more attention to shale oil which the greatest quantity in the Russian Federation occurs in the Bazhenov formation. The main objective of this paper is a review of obtained results of development of the Bazhenov formation on the Middle field.
Packer design research used in hydraulic fracturing
Authors: Verisokin A E , Vasil’yev V.A. , Gun’kina T A 
Published: November 2019

Abstract
The purpose of the packers is determined by the specific technological tasks. The design of a packer and the principle of bringing it into action provide protection from ealy wear during the tripping process. In addition, the design of a packer ensures manufacturability of its use and reliable control over the work in the well during the hydraulic fracturing, regardless of the depth of the installation. The experience with the use of packers for the test beds showed that in most cases packer items become inoperative due to the destruction of the lower part of the rubber element. In practice, the isolation annulus packer with different ways of planting is important and necessary to ensure reliable fixing of a packer at the place of installation in the borehole. It happens due to the use of anchoring unit and different designs of seals of packers.
Restoration of intake capacity of injection well by vibrations
Authors: Zaripova L M , Gabdrakhimov M S 
Published: November 2019

Abstract
Nowadays deterioration of productivity and intake capacity of wells cause different problems in exploitation of oil and gas fields. It happens because of some irreversible physicochemical processes in the bottomhole formation zone: swelling of clay materials, colmation, formation of stable emulsions, confluence of salts, iron oxides etc. Various methods and technologies are used to solve these problems. However, they have disadvantages, for example, material and energy intensity, short-lived equipment, technological complexity. The method of pulse action by various vibrations seems to be the most effective solution. Vibrations are mechanisms that create controlled fluctuations of the working body influencing a recycled material and a reservoir. Now they are widely used in different industries.
Impact of Security on Rental Price of Residential Properties: Evidence from South Africa
Authors: Odubiyi T B , Oguntona O A , Oshodi O S , Aigbavboa C O , Thwala W D 
Published: November 2019

Abstract
The property market plays a vital role in the economy through the provision of constructed space for productive activities and employment opportunities. Evidence gleaned from the literature suggests that the level of security within an area affects property prices. In the current study, the distance between a property and the police station was used as a proxy variable for measuring the perceived level of security. The data on rental prices of residential properties and its attributes were retrieved from a reliable property source (www.property24.com). A Neural network model was used for evaluating the impact of the presence of a police station on rental prices of residential properties within Cape Town, South Africa. Experimental results showed that the developed model is 77.27% accurate when used to predict the rental prices of residential properties. Floor area, number of bathroom, number of bedroom and proximity of a police station have the most significant impact on the rental price of residential properties. Greater efforts are needed to provide insights into the effect of sustainability on rental prices of residential properties. This information would serve a justification for embedding sustainability into residential construction projects.
Appraisal of risk contingency planning for construction projects
Authors: Akinradewo O , Aigbavboa C , Oke A , Coffie H 
Published: November 2019

Abstract
Risk contingency plan in a construction project allows for flexibility and effective responses to change orders and unforeseen risks arising at the construction phase of projects. A poor risk contingency allowance can result in cost overrun on a project as well as time overrun. However, a good risk contingency plan can be tailored based on the previous similar projects while taking into consideration the individuality of that particular project. The aim of the study is to review risk contingency planning for construction projects. Secondary data was used in carrying out this research study. Extant literatures were reviewed carefully for proper understanding of the methods used in carrying out risk contingency estimation, the importance of risk contingency to construction projects, the categories of risk contingency plans and the factors affecting the accuracy of risk contingency for construction projects. The study revealed and concluded that risk contingency serves as the extra budget that caters for uncertainties which can lead to cost overrun on construction projects thereby affecting the accuracy of the preliminary estimate. It was recommended that risk evaluation must be done appropriately at the planning phase of the construction project, so that the estimator can have more information necessary to factor into the estimation process thereby increasing the accuracy of the estimate prepared.
An assessment on the drivers and obstacles of sustainable project management in South Africa: A case study of Johannesburg
Authors: Ohiomah I , Aigbavboa C , Thwala W D 
Published: November 2019

Abstract
The construction industry has been identified as the industry which carry out unsustainable practices, and processes, this has led to several countries seeking to incorporate sustainable practices such as sustainable construction, sustainable construction project management to handle the growing concern over climate and environmental issues. Despite the construction industry awareness of these sustainable practices, it has been a problem implementing these sustainable practices. The aim of this study is to identify the barriers that hinder the implementation of sustainable project management in the South African construction industry, as well as drivers that encourages the implementation of sustainable project management. A quantitative methodology approach was adopted for this study, a questionnaire was employed to gather data for this study. A total of fifty-two (52) respondents returned their questionnaires. Findings from this study reveal that a major barrier to implementation of sustainable project management is the perception that green buildings are expensive, lack of expertise and lack of training also obstacles of the implementation of sustainable project management. Findings on what drives organisations to invest in sustainable project management is the benefits that will be gained financially This study concluded with recommendations stating that an increased level of training and drumming interest in the clients so that when the construction professionals propose the use of sustainable project management, there is an understanding by the clients.
Evaluation of the use of modern technologies for effective material management in South African construction industry
Authors: Odubiyi T B , Oke A E , Aigbavboa C O , Thwala W D 
Published: November 2019

Abstract
A vital building block for construction project globally is construction materials which are huge, costly and are often delivered in great quantities to the construction sites. One of the key roles in the successful completion and delivery of a project is effective construction materials management. However, it has been established that material wastage is a prevalent problem in developing countries which can be tackled with modern technologies for effective material management. It is based on this assertion that this paper focuses on the challenges to use of modern technologies for effective material management in the South African construction industry. The study adopted a quantitative approach where questionnaires were administered to professionals in the South African construction industry. Descriptive statistics tools were used to analyse the gathered data. Findings showed that the common challenges to using of modern technologies for effective material management in the construction in South African are; Scale of construction projects, Cultural barriers, environment challenges, financial challenges, and Behaviours of people in key positions. The way forward are; change in business approaches and procedure, and implementation of skill set is necessary
Awareness, benefits and drawbacks of net zero energy building practices: construction industry professional’s perceptions
Authors: Nduka D O , Ede A N , Oyeyemi K D , Olofinnade O M 
Published: November 2019

Abstract
In a bid to overcome climate change and global warming, the adoption of net zero energy building (nZEB) practices in construction projects has become a viable measure of reducing energy consumption and CO2 emissions in buildings. nZEB is a facility with a significantly lowered energy needs such that the rest of the energy requirements can be supplied by on-site or off-site renewable technologies. The present study therefore investigated the awareness, benefits and challenges confronting the actualization of nZEB in Nigeria construction industry. A cross sectional survey design was adopted wherein a close ended questionnaire was purposively administered online to construction industry professionals who have understanding of nZEB initiatives. Descriptive statistical tests were conducted, with the results showing about 9% and 25% of the selected professionals been not aware of nZEB concepts and have not been involved in the concept in their professional career. Further details revealed that reduction in the land use effect, reduction in vulnerability of power infrastructures to vandalism and economic competitiveness were dominant benefits of nZEB practices. However, low return on investment, conflict with public policy regulation and policy clarity, lack of evaluation and valuation processes were perceived as the top hindering factors to nZEB practices. The implication for practice is for construction stakeholders to participate and develop effective implementation strategies towards nZEB for could be ecological and economical friendly.
Quality of low-income housing projects in South Africa
Authors: Aigbavboa C , Oke A , Akinradewo O , Aghimien D , Okgonne S 
Published: November 2019

Abstract
One of the major duties of any government is to ensure that there are enough houses for the citizen. In view of the shortage, government and many private organisations have been involved in the provision and production of houses for the populace. It is therefore necessary to examine the level of conformance of these houses to acceptable level of quality. Several literature materials were reviewed and various factors causing low quality of buildings were extracted accordingly. To examine these factors, quantitative research method was adopted through administration of close-ended questionnaires on relevant construction professionals, which include Quantity Surveyors, Construction Managers, Architects, Engineers, Town Planners and Project Managers who have been involved in low-income housing projects in South Africa. Factors that contributes to non-adherence to required quality in low-income housing projects are poor site management, less focus on quality and much on production, focus on time by contractor, inadequate contractor’s quality expertise and usage of inexperienced personnel. The implication of these are tarnished image of the professionals involved in the project, defective buildings, unsafe structures and cost overruns. In order to ensure conformance to quality of these houses, contractors that handles construction of low-income houses should be knowledgeable with the National Builders Regulations and there should be monitoring and sufficient inspection of work in progress. Other measures include training and education of stakeholders, use of skilled labours, planning and risk assessment as well as use of appropriate construction materials.
Perception of professionals on causes of structural cracks in concrete buildings
Authors: Olofinnade O M , Busari A A , Akinwumi I I , Awoyera P O , Ekanem J 
Published: November 2019

Abstract
Of recent, the incessant collapse of buildings in some major cities in Nigeria has become a major concern to professionals in the construction industry and the general public because it has resulted in most cases loss of lives and valuables which could affect our attaining the sustainable development goals (SDGs). One of the key features that affect the quality of built structures and usage is crack. The occurrence of a crack in a structural member can weaken the member and eventually lead to building failure and outright collapse. This paper examines the perception of professionals in the Nigeria building industry on the causes and impact of crack on built structures. Primary data were obtained through questionnaires administered to practising professionals within Lagos state. Results obtained from the majority of the professionals indicate that occurrence of a crack in the building is majorly caused by foundation settlement, poor selection of construction materials and technique, design error and corrosion of the steel bar and thus have a significant impact on the structural integrity of the building. It was concluded by proposing certain preventive measures to mitigate crack in buildings so as to prevent possible building failure and attainment of the SDGs.
A comparative study on the strength characteristics of Grade 25 and Grade 30 rice husk ash blended cement concrete
Authors: Igba UT , Akinyele JO , Ehikhuenmen SO , Oyebisi SO , Omotainse PO , Anyanwu BU 
Published: November 2019

Abstract
Rice husk ash (RHA) is an agricultural waste which is a pozzolanic material that can be blended with cement in producing concrete. This research presents investigation carried out on the comparative strength characteristics of concrete produced with grade 25 and grade 30 cement blended concrete using a replacement level of 10% rice husk ash as substitute. Two mix ratios (1:2:4 and 1:1.12:3.01) were used. A total of 60 cube size of 150mm were cast, tested and their mechanical properties determined. The RHA was made in the laboratory by burning the husk obtained from Ifo in Ogun State Nigeria using an Electric furnace, with the temperatures of the furnace at about 700°C. The results showed that the compressive strength at 28 days decreased as the percentage replacement of Portland Limestone cement (PLC) with RHA increased from 0% to 10% respectively with compressive strengths of 29.78 N/mm2 to 21.56 N/mm2 for grade 25 concrete and 32.12 N/mm2 to 26.82 N/mm2 for grade 30 concrete. It was concluded that RHA replacement in concrete can be used for the production of concrete for light structural works in the development of sustainable and green structures.