bluuebunny/crossref_metadata_2025_split huggingface dataset:
Electrochemical Cutting of Micro-Holes in Tubular Stepped Concentrator-Waveguide for Medical Purposes
Authors: Aliakseyeu Yu. G. , Korolyov A. Yu. , Budnitskiy A. S. , Wenqi Dai 
Published: October 2019

A great attention has been recently paid to development of ultrasound technologies for treatment of blood vessels throughout the world. Authors of the paper have developed a new effective treatment method and ultrasound equipment that allow to carry out destruction of intravascular formations with simultaneous increase in elasticity of a vascular wall together with cardiologists from Belarusian Medical Academy of Postgraduate Education and Republican Scientific and Practical Center “Cardiology”. Advantages of the method are absence of necessity in surgical intervention, low probability of complications, low cost of treatment. The main component of the developed ultrasonic equipment is a tube-type stepped concentrator-waveguide having a spherical tip at a distal end with a single axial hole of 0.5 mm-diameter and three radial holes of 0.3 mmdiameter located at an angle of 120° relative to each other. The main effect for application of the concentratorwaveguide is achieved by ultrasonic vibromechanical action of a spherical tip on intravascular formation with subsequent removal of destruction products by their aspiration from a vascular bed. An additional effect is provided due to cavitation action on vascular formation and vessel walls by flow of fluid supplied via an internal cavity of the stepped concentratorwaveguide through the holes in the spherical tip. This contributes to a significant improvement in elastic properties of a vascular wall in atherosclerosis and diabetes. It is necessary to ensure high accuracy and quality of surfaces for the formed microholes in order to achieve maximum efficiency of the cavitation jet impact on intravascular formations and on the vascular wall. According to the analysis results on specific features of existing methods for small-diameter hole shaping, an electrochemical hole cutting method has been proposed which allows to obtain accurate micro-holes with a diameter of 0.3 mm and high surface quality in parts of small cross section and rigidity. The paper presents results of study on effect of electrochemical holes cutting parameters (voltage, concentration and consumption of electrolyte) on size and shape of the formed microholes. Main modes of electrochemical holes cutting process have been developed which allow to form micro-holes in a spherical tip of a tubular concentrator-waveguide with required accuracy, dimensions and shape.
Influence of Diesel Fuel Ignition Portion Value on Working Process Parameters of Gas-Diesel Engine
Authors: Vershina G. A. , Bystrenkov O. S. 
Published: October 2019

More and more requirements are imposed to engines of internal combustion due to the passage of time. These requirements are caused by the necessity to save fuel, to reduce emissions of pollutants into the atmosphere, to improve operational reliability, to reduce size and cost of spent materials, weight, noise level, to simplify manufacturing and operational processes. Use of gas as a fuel in the cities where number of engines is extremely large can significantly reduce environmental pollution. Some countries have separate environmental programs that encourage transfer of engines from gasoline to gas. At present, however, the use of gas engines in road transport is limited due to a number of technical and operational problems. Mathematical calculations and simulations are applied in order to solve this task and prevent possible problems in a manufactured. As part of the research to establish an influence of the diesel fuel ignition portion value in a gas-diesel engine on parameters of its operational process, it is necessary to develop an appropriate calculation method. In this regard, an analysis of methods and programs for calculation of the operational engine process has been carried out, and a method for calculation of an operational process for a gas-diesel engine has been developed in the paper. A computational study has been made in accordance with the developed methodology. The paper has revealed an influence of the diesel fuel ignition portion value on effective and environmental performance of an engine operation. The calculation has been performed for a nominal mode of the engine operation, gas fuel – propane-butane. Design parameters of a ГД-243-engine have been taken as initial data for the calculation. The following dependences have been established: as a diesel fuel ignition portion is increasing (replacement proportion of gas fuel with diesel), there is some decrease in engine power, and under the accepted conditions, there is an increase in CO2 with a decrease in CO and NO.
Optimization of Wastewater Treatment Process on Energy Costs at Truck and Tractor Washing Posts
Authors: Krutau A. V. , Dechko M. M. , Boika M. A. 
Published: October 2019

The paper considers a process pertaining to purification of oily effluents while using electrocoagulation, electro-flotation and an electromagnetic hydro-cyclone, implemented with the help of a laboratory unit (Patent of the Republic of Belarus for the invention No 21229). The investigations have been carried out with the purpose to optimize specific energy consumption for the process of cleaning fuel and lubricants effluents. The following investigation methods have been applied – a literature review, a comparative analysis, an experiment execution, a mathematical modeling. Content of oil products in wastewater before and after treatment has been evaluated in the analytical laboratory of the Belarusian State Agrarian Technical University in accordance with standard methods. Purification of the oily effluents has been made with the help of a laboratory unit while using electroflotocoagulation method with removal of floated sludge in an electromagnetic hydrocyclone. This cleaning method makes it possible to increase a degree of water disinfection, provides a closed water supply, rational use of water resources, reduction of harmful effects of pollutants on the environment. An experimental design technique has been worked out and a three-level Box – Behnken design has been implemented in the paper. The problem concerning optimization of the purification process on energy costs has been solved without worsening the required concentration indices of petroleum products in water after treatment . Mathematical models have been obtained and optimal purification modes have been determined at the lowest specific energy costs and with sufficiently high degree of purification. Significance of regression coefficients has been estimated by Student criterion. It has been established that while using the proposed unit it is possible to obtain a degree of wastewater purification at automotive equipment washing stations with its performance G = 0.7 l/s, current density j = 150 A/m2. The degree of purification, determined by ratio of pollutant concentrations before and after purification, is up to 99.9 %. The results can be used in implementation of microprocessor control of cleaning mode while taking an initial concentration of pollution, unit capability, current density of an electroflotocoagulator as control action factors.
Urgensi Penerapan Sistem Ekonomi Islam
Authors: Fahrurrozi Fahrurrozi 
Published: October 2019

Abstract: The ideology of capitalism cannot be separated from the understanding of European liberalism that occurred in the 18th century, where capitalism and liberalism were born in response to the dictatorship of the feudal lords and the church at that time. Meanwhile, the emergence of socialism in the 19th century, could not be separated from the role of Karl Marx who wrote a book The Communist Manifesto of a German socialist figure who had contributed in the revival of the union and unity of the workers and intellectuals who had more than a century been amputated by market mechanisms. The Islamic economic system regulates all economic activities, so that humans as economic agents cannot be free as freely as possible, there are limits set in the Koran and Hadith, all the objectives of economic activity cannot be separated from Islamic values, making and selling illicit goods such as alcohol is not permissible in Islamic economics. The Islamic economic system is not only used as an alternative economic system but is a solution of various economic problems today. الملخص: لا يمكن فصل أيديولوجية الرأسمالية عن مفهوم الليبرالية الأوروبية التي حدثت في القرن 18. لقد ولدت الرأسمالية والليبرالية استجابةً لديكتاتورية اللوردات الإقطاعية والكنيسة في ذلك الوقت. في هذه الأثناء، لا يمكن فصل ظهور الاشتراكية في القرن 19 عن دور كارل ماركس الذي كتب كتابًا بعنوان البيان الشيوعي لشخصية اشتراكية ألمانية ساهم في إحياء اتحاد ووحدة العمال والمفكرين الذين تم بترهم بواسطة آليات السوق منذ أكثر من قرن. ينظم النظام الاقتصادي الإسلامي جميع الأنشطة الاقتصادية، بحيث لا يمكن للبشر بوصفهم عملاء اقتصاديين أن يتمتعوا بالحرية قدر الإمكان، فهناك حدود محددة في القرآن والحديث، ولا يمكن فصل جميع أهداف النشاط الاقتصادي عن القيم الإسلامية، لا يجوز صنع وبيع سلع غير مشروعة مثل الكحول في الاقتصاد الإسلامي. لا يتم استخدام النظام الاقتصادي الإسلامي كنظام اقتصادي بديل فحسب، بل هو حل لمشاكل اقتصادية مختلفة اليوم. Abstrak: Ideologi kapitalisme tidak bisa dipisahkan dari paham liberalisme eropa yang terjadi pada abad ke 18, dimana kapitalisme dan liberalisme lahir sebagai respon atas diktatorisme para kaum feodal dan gereja waktu itu. Sementara itu kemunculan sosialisme pada abad ke 19, tidak lepas dari peranan Karl Marx yang menulis sebuah buku The Communist manifesto seorang tokoh sosialis Jerman yang telah memberikan sumbangsih dalam kebangkitan persatuan dan kesatuan kalangan buruh dan intelektual yang sudah lebih dari seabad diamputasi oleh mekanisme pasar. Sistem ekonomi Islam mengatur seluruh aktifitas ekonomi, sehingga manusia sebagai pelaku ekonomi tidak bisa bebas sebebas-bebasnya, ada batasan-batasan yang sudah diatur dalam al-Qur’an dan Hadits, seluruh tujuan aktifitas ekonomi tidak bisa di pisahkan dengan nilai-nilai Islam, membuat dan menjual barang-barang haram seperti alcohol tidak diperbolehkan dalam ekonomi Islam. Sistem ekonomi Islam bukan hanya dijadikan sebagai sistem ekonomi alternate tapi menjadi solusi dari berbagai permasalahan ekonomi saat ini.
Persepsi Akuntan Manajemen terhadap Penerapan Tax Planning
Authors: Septiano Renil , Sari Nila 
Published: October 2019

Abstract: Tax planning is a means of fulfilling tax obligations well but the amount of tax paid can be reduced as low as possible to obtain the expected profit and liquidity. This study aims to see the effect of management accountants' perceptions on the implementation of tax planning. The type of research used is quantitative, using primary data. The population of the research was in Food Distributor companies in the Padang City. Respondents who were taken were employees who served as part of accounting staff, management and financial staff companies who worked at the Food Distributor Padang City. Selection of samples was selected using the Convenience sampling method with 30 respondents. Technical data analysis using simple regression analysis. The test results show that the perception variables of management accountants with a significant value of 0,000 < 0,05. Based on the test results it was found that the perception of management accountants has an effect on the implementation of tax planning الملخص: يعد التخطيط الضريبي وسيلة للوفاء بواجبة الضريبية بشكل صحيح ولكن يمكن تقليل مقدار الضريبة المدفوعة إلى أدنى مستوى لأجل الحصول على الربح والسيولة المتوقعين. تهدف هذه الدراسة إلى دراسة تأثير تصورات المحاسبين الإداريين على تطبيق التخطيط الضريبي. نوع البحث المستخدم كمي، باستخدام البيانات الأولية. السكان البحثيون في شركات توزيع المواد الغذائية في مدينة بادانج ، وكان المشاركون في الاستبيان من الموظفين الذين عملوا في موظفي المحاسبة والإدارة وموظفي تمويل الشركة الذين عملوا في شركة توزيع المواد الغذائية في مدينة بادانغ. تم اختيار عينات مختارة باستخدام طريقة أخذ عينات الراحة أو أخذ عينات الملائمة مع مجموعة 30 من المشاركين. تحليل البيانات الفنية باستخدام تحليل الانحدار البسيط. تظهر نتائج الاختبار أن تصور محاسبي الإدارة متغير بقيمة كبيرة من 0،000 <0.05. بناءً على نتائج الاختبار، تبين أن تصور محاسبي الإدارة يؤثر على تطبيق التخطيط الضريبي. Abstrak: Tax planning merupakan sarana dalam memenuhi kewajiban perpajakan dengan baik tetapi jumlah pajak yang dibayar dapat ditekan serendah mungkin untuk memperoleh laba dan likuiditas yang diharapkan. Penelitian ini bertujuan untuk melihat pengaruh persepsi akuntan manajemen terhadap penerapan tax planning. Jenis penelitian yang digunakan bersifat kuantitatif, dengan menggunakan data primer. Populasi penelitian pada perusahaan Distributor Makanan di Kota Padang, Responden yang diambil adalah pegawai yang menjabat dibagian staff akuntasi, menejemen dan staff keuangan perusahaan yang bekerja pada perusahaan Distributor Makanan Kota Padang. Pemlihan sampel dipilih menggunakan metode Convenience sampling atau sampling kemudahan dengan jumlah 30 orang responden. Teknis analisis data menggunakan analisis regresi sederhana. Hasil pengujian menunjukkan bahwa variabel persepsi akuntan manajemen dengan nilai signifikan 0,000 < 0,05. Berdasarkan hasil pengujian didapat bahwa persepsi akuntan manajemen berpengaruh terhadap penerapan tax planning
Design Optimization for Drilling Development Wells
Authors: Al Kalbani Zakariya Abdullah , Moreno Carlos Alberto , Agguirre Abel Eduardo , Al Jahwari Mohammed , Sutherland Andrew , Elyas Mutaz 
Published: October 2019

Abstract
The successful drilling campaign from all aspects is all depending on a robust solution developed during the design phase on the well construction process. This paper describes the advance technical engagement between the operator and integrated drilling services provider to generate an optimum well design for drilling development wells in Sahmah field of block 7, in the south east of Oman.
Integrated Drilling Services (IDS) provider in Oman was awarded a contract to drill 10 firmed wells for a national client. One of the most challenging environments in the surface section is to drill and cement highly fractured and caved carbonate formation (UER) which prone to losses as this play a major risk and later deal with problematic shale formation in the same section. Moreover, the client decided to change the scope of some of the development wells and go for exploration pilot hole exploring deeper horizons to evaluate other potential hydrocarbon zones.
The engineering team have the opportunity to study the field in depth. As a result of analyzing offset wells data, geological and geomechanical studies, a new well design has been proposed which eliminates one section of the previous well design which was executed on some of the offset wells before. In the same proposal, the intermediate casing setting depth was been extended deeper successfully to accommodate the changes in the scope to explore deeper horizons.
The new proposed well design achieved reduction in well construction time and cost for the client enabling reduction in overall Authorization for Expenditure (AFE). This enabled the introduction of new technologies which improved performance. The drilling design consideration process in this paper can be used to provide a valuable insight for future projects where complex technical study in advance is the key to success.
Operating GOSP Disposal System Without Seawater Supply
Authors: AL-Mulhim Khalid 
Published: October 2019

Abstract
HdGOSP-2 was designed to be fully dependent on Haradh Water Injection Plant (WIP). Haradh WIP receives disposal water from HdGOSP-2 disposal system and sea water from Hawiyah Central Water Injection Plant (HCWIP). Therefore, Haradh WIP can only be run when HCWIP is online. As a result, if HCWIP is down, HdGOSP-2 total oil production is also locked due to lack of alternative solutions to inject disposal water. During the past three years, HdGOSP-2 oil production was locked for (13) days due to the loss of water supply from HCWIP. The idea is to operate (1) turbine driven injection pump solely with HdGOSP-2 disposal water for a temporary period to be fully independent from Hawiyah WIP. The current produced water rate at HdGOSP-2 is 120 MBD and in order to meet the minimum flow requirement for the injection pumps, a total of 90 MBD needs to be recycled. It has been evaluated the potential increase in water temperature due to recycling using HYSYS simulation revealing no significant temperature rise. In addition, the simulation output along with reliability & rotating equipment evaluation revealed that this option can only work if the pump discharge pressure is maintained above 2200 psig. This can be achieved by isolating some of HdGOSP-2 Flanks and reducing the number of water injection wells on service.
This mode of operation was started on April 26, 2018 and lasted for six (6) days. During this period, the sea water rate was gradually decreased to zero while maintaining HdGOSP-2 disposal water flowing through GT-4001 with partial recycle and without having any impact on HdGOSP-2 oil production rate or crude quality specifications.
Upon completing the 1st implementation of this initiative, HdGOSP-2 has produced total of 1.98 MMBOD of oil during the outage of HCWIP in 2018. HdGOSP-2 has produced 1.98 MMBOD of oil during the outage of HCWIP which is equivalent to $96,000,000 during six (6) days outage of HCWIP in 2018. The production gain will continue in the future whenever HCWIP is down.
Cost Effective Minimal Offshore Structure in Shallow Water Marginal Fields
Authors: Chatterjee Prabir Kumar , Shah Jinesh 
Published: October 2019

Abstract
This paper proposes a method of securing well conductors in shallow water open sea without installing a structural jacket. The method allows well completion at surface (above water) for subsequent easy production operation without installing mudline suspension system. Stability of the conductors against environmental loads will be ensured by a few tie members connected to seabed by small concrete blocks. Numerical studies have been carried out for one and two wells in 20.0m water depth to withstand directional environmental forces due to a maximum of 10.5m high waves. Only after a successful drilling outcome, installation of an offshore platform with more wells can be undertaken to facilitate production operation. If more than two wells is not commercially feasible from the same location due to low reservoir capacity, a cost-effective minimum structure is proposed for supporting immediate production operation.
Numerical Investigation of CO2 Sequestration as Hydrates in Produced Natural Gas Hydrate Formation with Different Intrinsic Permeability and Water Saturation Conditions
Authors: Ahmad Sheraz , Li Yiming , Li Xiangfang , Xia Wei , Chen Zeen , Wang Peng , Yin Zhiming 
Published: October 2019

Abstract
The phase transition field model equations for hydrate-bearing formation are proposed to analyze the variations in pressure, temperature, hydrate growth rate and other parameters during CO2 injection and storage as solid hydrates. The numerical algorithm results show that intrinsic permeability and water saturation has great influence on hydrate nucleation process. When the intrinsic permeability of sediment decreases from 100 mD to 10 mD and 1 mD, pressure distribution delays inside hydrate-bearing formation and indirectly it also suspends the hydrate growth process due to smaller hydrate growth rate. The slow hydrate nucleation speed affects other parameters variations like, temperature distribution, accumulative hydrate growth, CO2 permeability and 1st and 2nd region boundaries movement. The hydrate growth termination effect is observed near the wellbore region at different absolute permeability conditions. The hydrate growth suspension is more prominent when the intrinsic permeability reduces from 100 mD to 10 mD and 1 mD. Therefore, CO2 injection at low temperature and high pressure conditions may form hydrates but it seems challenging in lengthier formation. So, more than one injection facilities can solve this problem with less injection pressure.
Investigation of Enhanced Oil Recovery with the Upscaled Three Phase Flow Model in an Oil Reservoir
Authors: Rabbani Shahid , Abderrahmane Hamid , Sassi Mohamed 
Published: October 2019

Abstract
For past few decades, Enhanced Oil Recovery (EOR) has been posing an exigent task for researchers in oil and gas industry. Traditionally for many geological formations, water and gas are used as displacing fluids for oil recovery. More recently foam–a dispersion of liquid in gas–has proved to be highly successful than traditional fluid displacement methods to recover trapped oil in the porous rock. Foam increases oil displacement efficiency by controlling gas mobility and gravity override. In this work oil recovery efficiency using water, gas and foam flooding is compared. To determine optimal oil recovery scenario, we perform numerical modelling for two-phase immiscible flows in porous media and perform simulations to determine oil recovery from water, gas and foam flooding. 2D two-phase and three-phase flow models are created in COMSOL and effects of viscous instabilities and permeability of different ground layers on recovery factor are investigated.
New Techniques of Through-Barrier Diagnostics to Improve Integrity Management Decisions in Reservoir Development of Complex Reservoirs
Authors: Gibrata Muhammad , El Sayed Mohamed , Naguib Hashem Mohamed , Aslanyan Irina , Minakhmetova Roza , Skutin Vasiliy , Abasher Doha , Abu-Rahmoun Husam 
Published: October 2019

Abstract
The mature oil field in the Caspian Sea was originally discovered in the 1960’s and more than 100 wells were drilled in the field. When Dragon Oil inherited the field in the 90s, it had a well stock of varying issues and complexities that required a full field well integrity review to cover the entire well lifecycle. Dragon Oil had a field-wide detailed well status report demonstrating that many wells had integrity problems related to sustained annulus pressure (SAP) in a variety of annuli, which, when risk-ranked, clearly identified those wells that needed intervention.
This paper will demonstrate the cases where slickline-conveyed cased-hole memory logging tools were run at three different well lifecycle stages: Well drilling - to detect the shallow water or gas source and perform a remedial jobProduction operations - to identify sustained annulus pressure sources so remedial solutions could be prepared to cure high risk wellsPlug&Abandonment planning - to provide a status report of downhole well conditions so that a cost-effective abandonment programme could be planned and executed.
In each of the above cases, the data collected during logging operations provided a clear identification of the related well issues and was sufficient to allow detailed planning and execution of remedial jobs and abandonment operations.