bluuebunny/crossref_metadata_2025_split huggingface dataset:
ИСПОЛЬЗОВАНИЕ МЕТОДОВ МАШИННОГО ОБУЧЕНИЯ «БЕЗ УЧИТЕЛЯ» ДЛЯ ПРЕДУПРЕЖДЕНИЯ ПРИХВАТОВ БУРИЛЬНОЙ И ОБСАДНОЙ КОЛОНН
Authors: Щербаков Роман Эдуардович , Ковалев Артем Владимирович 
Published: April 2022

Ссылка для цитирования: Щербаков Р.Э., Ковалев А.В. Использование методов машинного обучения «без учителя» для предупреждения прихватов бурильной и обсадной колонн // Известия Томского политехнического университета. Инжиниринг георесурсов. – 2022. – Т. 333. – № 4. – С. 66-78.
Актуальность. С каждым годом истощение легкодоступных запасов углеводородов определяет необходимость разработки месторождений, характеризующихся сложными горно-геологическими условиями. Строительство скважин в данных условиях часто сопровождается различными осложнениями и авариями. Повышенные риски их возникновения обусловлены усложнением конструкции скважины, траектории ствола, а также недостаточно достоверными данными о горно-геологических условиях бурения. Прихват бурильной или обсадной колонны является одной из самых сложных аварий, которая оказывает существенное влияние на эффективность бурения и стоимость строительства скважины. Зачастую при возникновении прихвата требуется проведение дорогостоящих мероприятий по его ликвидации. В настоящее время признаки прихвата определяются по параметрам бурения инженерным составом, однако ввиду особенностей человеческого восприятия и сменного режима работы это происходит несвоевременно. Недостатки используемого в настоящий момент подхода предопределили использование алгоритмов машинного обучения. Интеллектуальная система может автоматически анализировать тенденции изменения параметров бурения, обнаруживать аномалии в реальном времени, заблаговременно прогнозировать вероятность возникновения аварии и предупреждать инженера по бурению на ранней стадии, что позволит реализовать превентивные мероприятия до того, как колонна будет прихвачена. Цель: создание алгоритма, позволяющего прогнозировать вероятность возникновения прихвата бурильной или обсадной колонны в процессе бурения скважины на основании анализа данных геолого-технологических исследований. Методы: анализ современных достижений в области определения аномалий во временных рядах при помощи алгоритмов машинного обучения; создание алгоритма прогнозирования прихвата на языке программирования Python с использованием библиотек с открытым исходным кодом. Результаты. Авторами разработан алгоритм прогнозирования прихвата, проведена оценка его эффективности на тестовой выборке, а также масштабируемость на прочие аварии и осложнения, возникающие в процессе бурения. Определены перспективные направления дальнейших исследований.
Model Matematika Vibrasi Dawai Dikenai Massa yang Berjalan di Atasnya
Authors: Janah Miftakul , Kusumastuti Ari 
Published: April 2022

This study discusses the formulation of a mathematical model of string vibration when subjected to mass. There are two variables resulting from the formulation of the model, namely the deflection of the string and the angle of the string . The deflection of the string and the angle of the string . are affected by the friction force, tension force, spring force, and gravity. Then the identification of the working potential and kinetic energy is carried out to obtain the Lagrange equation of the deflection and angle of the string. Based on the formulation steps that have been described, the mathematical model obtained is an ordinary differential equation of the order of one to the power of two. Furthermore, the model is calculated numerically by assigning values to the parameters involved. So it is known that with a string mass of 0.005 kg, 0.05 kg, 0.5 kg, a string mass of 0.075 kg, and an object radius of 0.07 m, it is known that the deflection of the string is greater if the object's mass is greater. While the angle of the string is in a state of equilibrium before being subjected to a mass and experiencing vibration after being subjected to a mass.
Analisis Dinamik Model Matematika Penyebaran COVID-19 Pada Populasi SEIR
Authors: Meyliana Ester , Kusumastuti Ari , Juhari Juhari 
Published: April 2022

This study discusses the dynamic analysis of the mathematical model of the spread of COVID-19 using daily cases in Indonesia which are classified into four variables, namely, Susceptible (S), Exposed (E), Infected (I), and Recovered (R) which are then analyzed dynamically by calculate the equilibrium point and look for stability properties. The two equilibrium points of this model are the disease-free equilibrium point and the endemic equilibrium point . Then, it is linearized around the equilibrium point using the given parameters. Linearization around the equilibrium point produces four eigenvalues, one of which is positive. Linearization around the equilibrium point yields two negative real eigenvalues and a pair of complex eigenvalues with negative real parts. Phase portraits and numerical simulations have shown that all variables S, E, I, and R will be asymptotically stable locally towards the equilibrium point, namely the endemic equilibrium point . Thus, based on the dynamic analysis obtained, it is shown that the disease-free equilibrium point is unstable and the endemic equilibrium point is locally asymptotically stable.
ANÁLISE QUALITATIVA DAS PREPARAÇÕES DE CARDÁPIO EM UM RESTAURANTE UNIVERSITÁRIO: IMPACTO DA UTILIZAÇÃO DE GÊNEROS DA AGRICULTURA FAMILIAR
Authors: Muniz Pereira Dalva , Nascimento Oliveira Jadson Vinícius , Muniz Pereira Cecília Teresa 
Published: April 2022

Este trabalho teve por objetivo avaliar qualitativamente o cardápio oferecido para estudantes da Educação Básica de uma Instituição Federal de Ensino antes e após a utilização de gêneros da agricultura familiar através do método Análise Qualitativa das Preparações de Cardápio-AQPC. O instrumento de pesquisa foi o cardápio referente às preparações de almoço oferecidos nos períodos 2018.2 e 2019.1 de um Restaurante Universitário terceirizado. A avaliação do cardápio foi realizada por meio do método AQPC e também de acordo com as recomendações do Guia Alimentar para a População Brasileira. Os dados foram tabulados em relação ao número total de dias dos cardápios analisados. Foi verificado que o cardápio 2019.1, que passou a utilizar frutas, verduras e hortaliças oriundas do Programa Nacional de Alimentação Escolar através da Agricultura Familiar, apresentou melhoras nos parâmetros oferta de frutas, oferta de doces e oferta de doce + frituras. Houve um aumento da presença de frutas, que foi ofertada em 100% dos dias e exclusão da oferta de doces. A utilização do método AQPC se mostrou uma ferramenta útil para verificar a qualidade dos cardápios oferecidos na UAN avaliada, confirmando que a utilização de gêneros da agricultura familiar melhorou a oferta de frutas e hortaliças.
Peranan Jepang dalam Sektor Luar Negeri Indonesia
Authors: Prapti Endang Sih 
Published: April 2022

Kasus mobil nasional (mobnas) mengguncang hubungan bilateral Indonesia dengan negara-negara produsen eksportir mobil yang selama ini menjadi pemasok ke Indonesia, khususnya Jepang. Jepang menuduh Indonesia melakukan praktek diskriminasi yang bertentangan denganketentuan perdagangan bebas WTO (World Trade Organization). Tulisan ini ditujukan untuk melihat apakah Indonesia perlu menanggapi tuduhan tersebut secara serius. "Retaliasi Jepang" merupakan solusi natural Jepang terhadap kasus mobnas, yang perlu diantisipasi Indonesia. Keseriusan permasalahan yang akan dihadapi Indonesia merupakan fungsi dari ukuran dampak "retalisasi Jepang" tersebut terhadap perekonomian Indonesia, melalui dampaknya terhadap sektor luar negeri Indonesia. Tentu saja, Indonesia juga dapat membalas melakukan "retaliasi balik" kepada Jepang.Berdasarkan kajian pada tulisan ini, pada kenyataannya hipotesa terbukti bahwa peranan Jepang adalah crucial bagi perekonomian Indonesia. Untuk itu kasus mobnas merupakan kasus yang perlu ditanggapi dengan hati-hati dan penuh perhitungan. MeskipunIndonesia juga merupakan mitra ekonomi yang sangat penting bagi Jepang, namun demikian penjelasan di atas menunjukkan bahwa "retaliasi Jepang" yang mungkin timbul akibat penanganan kasus mobnas yang kurang bijaksana dapat menimbulkan dampak yang cukup serius bagi Indonesia, baik melalui hutang, bantuan pembangunan, maupun perdagangan luar negeri. Oleh sebab itu usul Indonesia dalam agenda acara APEC di Teluk Subic, Filipina tentang liberalisasi otomotif merupakan indikasi kedewasaan Indonesia dalam menangani kemelut kasus mobil nasional.
Relevansi adopsi manajemen Jepang dalam kerangka pengembangan sumber daya manusia dan industrialisasi di Indonesia: Pendekatan proses dan keterkaitan ekonomi
Authors: Muhadi Akhmad 
Published: April 2022

TheJapanese transplants in Indonesia have been playing an important role on the process of industrialization in Indonesia. As the "World class" plants, theysupport to the establishment of the Indonesian's industrial performance. They characterized by their best production system based on the technology and the high quality and productivity based on the human resource development system. It is proved that those systems created such value chain by producing product in high competitive advantages in the world market. By adopting the Japanese Management. Indonesia which has low-cost labor, will create strategic advantages perform in technology with low-cost production'. As for Indonesian Government, the competitive advantages are the important aspects for anticipating the Free Trade Market system in 2003 according to AFTA agreement, and also APECagreement in 2020. Nowadays. Indonesian Government's Second Long-run Development Program has been holding the key concept: Human Resource Development Here, the discussion about the human resource development strategy on the Japanese transplants in Indonesia will come up. especially in the process of adoption of the Japanese Management.
MACRO ECONOMICS FACTORS AND BANK LENDING BEHAVIOUR IN INDONESIA
Authors: Rokhim Rofikoh , Rusli Yinylia 
Published: April 2022

AbstractThis study examines the influencing macro economics factor in lending distribution and observes the comparison of each factor based on lending type which are investment, working capital and domestic consumption lending. Using data of Indonesian commercial banks between 2003-2011 and a balanced panel method, it finds that bank liquidity and inflation rate have significant negative effect, while number of banks has strong positive influence to stimulate lending distribution. Moreover, saving rate and GDP growth were found not meaningfully contributed to change investment lending distribution, but they significantly influenced the other lending distribution. Lastly, reserve requirement and exchange rate did not significantly influence all lending type.Keywords: Loan, interest rate, growth, GDP.JEL Classification Numbers: G21, E43, E51AbstrakStudi ini meneliti faktor ekonomi makro yang mempengaruhi distribusi pinjaman dan mengamati perbandingan masing-masing faktor berdasarkan jenis pinjaman yaitu pinjaman investasi, modal kerja dan konsumsi. Dengan menggunakan data dari bank-bank komersial di Indonesia antara 2003-2011, dengan menggunakan analisis data panel, ditemukan bahwa likuiditas perbankan dan tingkat inflasi berpengaruh negatif signifikan, sedangkan jumlah bank berpengaruh positif dan kuat untuk mendorong distribusi pinjaman pada semua jenis pinjaman. Selain itu, tingkat tabungan dan pertumbuhan PDB ditemukan tidak bermakna dalam kontribusinya untuk mempengaruhi distribusi kredit investasi, tetapi secara signifikan mempengaruhi distribusi pinjaman lainnya. Terakhir, GWM dan nilai tukar tidak signifikan mempengaruhi semua tiga kategori jenis pinjaman. Keywords: Loan, interest rate, growth, GDPJEL Classification Numbers: G21, E43, E51
THE FEASIBILITY OF FINANCING INDONESIAN MIGRANT WORKERS BY ISLAMIC BANKS
Authors: Pramuka Bambang Agus 
Published: April 2022

AbstractThis paper identifies the profile of migrant workers located in Banyumas regency, assesses the financial feasibility of the scheme, and gauges the viability of the migrant workers financing from conventional and Islamic banks’ perspectives. The samples comprises potential migrant workers, ex-migrant workers and their relatives. The nature of the study is descriptive qualitative where both primary and secondary data were analysed during the study. The result of the study indicates that financing migrant workers to work abroad is economically desirable for both conventional and Islamic banks. Either mode of financing, Islamic and conventional, are advantageous to the Indonesian workers who want to work abroad. Keywords: Feasibility study, financing, migrant workers, Islamic banks JEL classification numbers: G21, G29AbstrakMakalah ini mengidentifikasi profil pekerja migran di kabupaten Banyumas, menaksir kelayakan keuangan dari skema tersebut, dan memperkirakan kelayakan pembiyaan para pekerja migran dari perspektif bank islam dan bank konvensional. Sampel yang digunakan terdiri dari para pekerja migran potensial, bekas pekerja migran, serta keluarga mereka. Penelitian ini bersifat deskriptif kualitatif menggunakan baik data primer dan data sekunder. Hasil analisis menunjukkan bahwa pembiayaan terhadap para pekerja migran untuk bekerja di luar negeri secara ekonomis adalah layak baik dari pserspektif bank islam maupun bank konvensional. Baik mode pembiayaan islam maupun konvensional memberikan keuntungan bagi para pekerja Indonesia yang bekerja di luar negeri.Kata kunci: Studi kelayakan, pembiayaan, pekerja migran, bank islamJEL classification numbers: G21, G29
"Bagi hasil" dalam Bank Islam: Beban (biaya) atau bukan?
Authors: Adnan M. Akhyar 
Published: April 2022

Kehadiran Bank Islam di bumi Indonesia masih sangat baru. Bank Muamalat Indonesia (BMI) misalnya, baru berdiri pada 1 Nopember 1991, dan resmi beroperasi pada tanggal 1 Mei 1992 (BMI 1993, h. 18-19). Selain BMI, sampai saat ini belum ada Bank Islam lainnya yang beroperasi di Indonesia,kecuali 9 Bank Perkreditan Rakyat Syariah (BPRS) yang bertebaran di berbagai tempat (Adnan, 1994).
Experimental Study on Flight Time and Frame Toughness of Quadcopter Based on Waste Polystyrene Paper
Authors: Perdana Mastariyanto , Eru Putra Meiki , Septio Matrilindo Farid 
Published: April 2022

Application of natural composite materials for aerial fields has been widely developed. One of the uses of natural composite materials for Unmanned Aerial Vehicle (UAV) frame. In this study, waste polystyrene paper, bagasse powder and eggsheel powder was used for material of UAV frame. Type of UAV was made in this study is quadcopter. Addition of volume fraction of waste polystyene paper to 65 % in green composite material. The aims this study was determine the flight time and toughness frame of quadcopter based on waste materials. This study showed that there was increase of quadcopter flight time with the addition of waste polystyrene paper in composites up 65% by volume fraction. Addition of waste polystyrene paper in composites up 65% by volume fraction, the results showed that the toughness frame of quadcopter was decreased. Photomacro was used to show the stucture and porosity of frame quadcopter based on natural composite material.
Analysis of the Effectiveness of the Hardening Temper Process to increase M8 Bolt Strength
Authors: Anrinal  , Yanto Asmara , Kuswanto Dedi 
Published: April 2022

The purpose of this study was to analyze the effectiveness of the hardening-temper process on the strength of M8 bolts. The research was carried out through a hardening process with heating temperatures of 900°C, 1000°C, 1100°C, using a holding time of 15 minutes then quenched in aquadest cooling medium, then continued with a tempering process at the same tempering temperature of 400°C followed by cooling at room temperature. The torsional strength of the M8 bolt was obtained through torsional testing using the SM 1 MK II Torque Testing Machine. The results showed that the torsional strength of treated M8 bolts was lower than without treatment. Efforts to increase the torsional strength of M8 bolts with the hardening – tempering method are not recommended, because M8 bolts are made of low carbon steel which has low hardenability, so that the increase in torsional strength of M8 bolts is not significant.
Analysis of common pre-treatments in grain-size analysis (using a grain-size standard)
Authors: White Adam J. , Kienast Stephanie S. , Kienast Markus , Garwood Jessica C. , Hill Paul S. 
Published: April 2022

ABSTRACT
This study investigates the impacts of sample preparation procedures on grain-size measurements to determine comparability of data collected using differing methodologies. Grain-size distributions of marine and terrestrial sediments contain important information about the depositional environment. For example, the “sortable-silt index” (or mean grain size between 10 and 63 μm in marine sediments, is used as an indicator of flow speed and has been applied to the reconstruction of ocean current strength before the instrumental period. Similarly, the mean grain size of a sediment is used to classify it (e.g., silt versus sand). Accurate measurements of grain-size distributions often require chemical pre-treatments in order to remove sedimentary components of biogenic origin (e.g., shells), and multiple ways to perform these pre-treatments exist. This study tests whether the choice of pre-treatment introduces variability into grain-size distributions. We simulate multiple commonly used pre-treatments on a well-characterized internal standard (“Sillikers”) and compare the resulting mean size and sortable-silt index in each treatment group to untreated samples using ANOVA. Two instruments, a Coulter Counter Multisizer III and a Coulter LS 230 Laser Diffraction Analyzer are used. Results from the Multisizer III suggest that the choice of pre-treatment method does not significantly impact the final grain-size distributions but underlines the importance of replicates. Results from the laser sizer suggest that oven-drying leads to a small but statistically significant difference of ∼ 0.3 μm in the sortable-silt index, and drying samples via hot plate leads to another small but statistically significant difference of ∼ 0.29 μm. While it is unclear what causes these differences in the laser sizer data, they are smaller than the observed variations in sortable-silt index used to infer changes in current speed in a typical paleoclimate study. In conclusion, grain-size measurements are a robust tool for sediment analysis and are resistant to changes from differing pre-treatment methods tested here.
Developments in Hydrocarbon Production Enhancement Aids Under High Temperature and High Salinity Conditions for Hydraulic Fracturing
Authors: Do Linh , Kazempour Mahdi , Harkness Kellen , Moradi Mehrnoosh , Street J. Paul 
Published: April 2022

Abstract
During hydraulic fracturing, a large amount of aqueous fluid is introduced into the formation (some cases &gt; 500,000 bbls). This fluid becomes trapped within the fracture and formation, experiencing higher temperature (up to 150 ºC) and/or higher hardness and salinity (up to 300,000 ppm) with exposure to formation water and temperature. This process, which can include lengthy shut-ins, leads to formation damage through water blockage resulting in fracture conductivity impairment. This damage can be mitigated by the use of flowback aids which are stable to these conditions, enhancing fracture clean-up and thereby hydrocarbon production.
This study presents the development of novel formulations which are effective for fracture clean-up and production enhancement under harsh conditions. These flow improvers enhance the interfacial properties and relative permeability of crudes (collected from Eagle Ford, Permian, Bakken) up to 150 ºC and 300,000 ppm of total dissolved solids (TDS) over an extended period of time.
The stability to temperature and salinity of different flowback aid packages was evaluated in aging cells at 150 °C and 200 psi. The interfacial properties of flowback aids in brines with a range of TDS levels were examined at different temperature. The effect of the flowback aid treatment on the wettability of ground shale and proppant is also studied via imbibition and centrifuge drainage tests. Proppant regain permeability and modified fracture conductivity testing on split sandstone and shale cores with relatively low proppant loading (&lt;1 lb/ft2) was conducted to evaluate the effectiveness of different flowback aid treatments. The results showed that the developed flowback aid packages have superior temperature and TDS tolerance compared to conventional surfactants. Relatively low performance loss due to surfactant adsorption on shale and proppant was achieved. The optimized flowback aids packages attained low interfacial tension values with Permian, Bakken crude oils, and Eagle Ford condensate over a wide range of temperature and TDS values. The high temperature and brine stability of the developed surfactant systems allow them to be used for fracturing or refracturing at high temperatures and with high TDS produced or flowback waters.
Novel/Additive: The result demonstrates that flowback aids with consistent interfacial property is critical in enhancing fracture conductivity, thereby improving hydrocarbon production.
Using patient decision aids to inform decisions about cancer susceptibility genetic testing and risk management: A narrative review of impact and experience
Authors: Kohut Kelly , Morton Kate , Turner Lesley , Shepherd Jonathan , Fenerty Vicky , Woods Lois , Eccles Diana , Grimmett Chloe , Foster Claire 
Published: April 2022

Abstract
Objective
To evaluate how decision-support resources about taking up or interpreting genetic testing for hereditary cancer predispositions are experienced, and impact on cognitive or emotional outcomes.
Methods
A systematic review of quantitative, qualitative and mixed-methods studies involving adults with or without cancer who used an intervention to inform decisions about any cancer susceptibility genetic test or screening/risk-reducing options due to a known pathogenic gene variant. Interventions could be digital or paper-based and included information, education, risk presentation and decision-support resources. Study findings were summarised using narrative synthesis.
Results
Thirty-six publications describing 27 interventions were included. Interventions had a positive impact on experience and cognitive, emotional, and behavioural outcomes. None appeared to cause harm.
Conclusions
Decision-support resources should be used to complement the cancer genetic counselling patient pathway. These should be rigorously developed according to evidence-based frameworks and in collaboration with patients.