bluuebunny/crossref_metadata_2025_split huggingface dataset:
Wellbore Stability Analysis Based on Poro-Elastic Dynamics
Authors: Yang Shuai , Zhang Yanru , Pang Huiwen , Chen Ang , Li Yuan 
Published: September 2023

ABSTRACT
The poro-elastic dynamics method was adopted to analyze the near-wellbore stress field and shear failure response. Different from the traditional method, this proposed model includes the time-dependent characteristics of stress field, the fluid-solid coupling and the effects of fluid and solid inertia. A set of deep well parameters were taken as the examples to calculate the near-borehole stress field and failure response compared with the poro-elastic static model. The influences of poro-elastic parameters, in-situ stress and wellbore pressure on the shear failure responses were also analyzed in a detailed parametric study. The results show the importance of the inertial effects of the solid-fluid system, which produces a wave-diffusion behavior in the early times. Potential failure area calculated by the dynamic model is larger than that calculated by the static model, implying that the static solution underestimates the risk of wellbore collapse. Thus, the present model can help us understand the dynamic instability mechanism and it can also provide the theoretical basis for predicting collapse pressure accurately, optimizing drilling mud density and maintaining wellbore stability.

INTRODUCTION
Wellbore instability can cause many substantial problems during drilling, such as stuck pipe and lost circulation. Overall, problems related to wellbore collapse account for 5–10% of drilling costs in exploration and production, which are hundreds of million dollars per year, when considering time loss and the rental of drilling equipment (Fjar et al., 2008). When a wellbore is drilled, the concentration of stress around the borehole will occur which may damage the rocks if the concentrated stress exceeds the rock strength (Zoback et al., 1985). If the failed rock exceeds the cleaning capacity of the mud circulation, the excessive failed rock can cause stuck drill pipe or bottom-hole assembly. Sometimes, wellbore collapse can result in sidetracked holes and abandoned wells, which means a great loss in oil and gas industry. Therefore, wellbore stability analysis is vital to safe and effective drilling and production.
Comparative Study of Machine Learning Vs. BIS Approach for Landslide Hazard Zonation in Kashmir Himalayas, India
Authors: Singh Ankit , Singh Tarun , Rao K. S. 
Published: September 2023

ABSTRACT
Presently slope stability analysis and landslide hazard monitoring are the most challenging tasks in mountainous regions like the Himalayas. These events which were earlier considered as a process of attaining equilibrium in the topographic surface of the earth by nature, with the increase in population and onset of industrial revolution in the past few decades, changed the scenario of this natural phenomenon and transformed it into a disaster. The main reason for this is the utilization of inaccessible terrains for engineering mega projects and urbanization. Today, landslides are considered as the worst natural disasters and have become the objects of mass destruction and thereby new approaches for landslide study are being constantly developed with time to understand this natural phenomenon as much as possible. Witnessing the severity of this disaster in India and globally; this study is aimed to study landslide hazard in the domain of landslide susceptibility mapping and hazard zonation. This approach makes use of different instability causing parameters prevalent in the area to demarcate the region into different probable hazard zones. The resulting maps thus prepared are called Landslide Hazard Zonation (LHZ). For the study, a sub-part of Karewa Basin is selected as an area of study in Anantnag district, Jammu and Kashmir, India. Two different methods, the established Bureau of Indian Standards (BIS) method and the new machine learning based classification method using decision tree classification algorithm, are selected for the study of landslide hazard in the area. The resulting maps from both methods are analyzed and validated using the landslide inventory data. The results from both the methods are also used to perform a comparative analysis to examine which method yields better results. It is concluded that machine learning based methods, provided accurate training dataset can yield better results than the traditional methods which require a makeover to incorporate more data, made available with the advancement of technology.
Geomechanical Characterization of the Mount Simon Sandstone and Eau Claire Formation of Northern Illinois Basin
Authors: Camargo J. T. , Appriou D. , Burghardt J. 
Published: September 2023

ABSTRACT
The purpose of this paper is to analyze publicly available geomechanical data from two carbon storage sites in the Illinois Basin: the Illinois Basin-Decatur Project (IBDP) in Macon County, IL and the FutureGen2.0 project in Morgan County, IL, which was cancelled before injection began. This study estimates the magnitudes and directions of the least compressive principal stress gradient using hydraulic fracture-based stress measurement tests, borehole breakouts, and sonic logs in the Eau Claire Formation (primary confining zone) and the Mount Simon Sandstone (targeted reservoir). The range of stresses expected in the underlying Precambrian basement is also investigated. The evaluation of the state of stress is carried out in a probabilistic manner using the State of Stress Analysis Tool (SOSAT) developed under the National Risk Assessment Partnership (NRAP) program. Finally, the paper also provides a discussion on distinctions between fracture initiation pressure, propagation pressure, and fracture closure pressure, given that hydraulic fracture testing results show a significant difference between these three values. The discussion also addresses why the fracture closure pressure should be preferred in injection pressure determinations, a critical point in geological carbon storage projects.

INTRODUCTION
In this paper, geomechanical data from two geological carbon storage (GCS) sites in the northern Illinois basin are analyzed and compared to each other. The GCS projects are the Illinois Basin-Decatur Project (IBDP) in Macon County, IL, and the FutureGen2.0 project in Morgan County, IL. While operations in IBDP were fully completed, the FutureGen2.0 project was interrupted before injection began. Both sites underwent extensive subsurface characterization and made their geomechanical data publicly available.
The geomechanical datasets have been analyzed separately. For example, Appriou (2019) assesses the geomechanical risks associated with CO2 injection at the FutureGen2.0 site and Gilmore et al. (2016) describe and analyze the comprehensive characterization program at the FutureGen 2.0 site and refer the readers to essential publications regarding further characterization efforts, modeling of carbon dioxide (CO2) injection and transport, monitoring, verification, and accounting plan. For IBDP, Bauer et al. (2016) and references therein provide an overview of the geologic characterization of the site and analyze the microseismic response to CO2 injection at the IBDP site.
Application of Balanced Cementing Technology in Serious Leaking Well with Foam Cement Slurry
Authors: Chu Yongtao , Liu Kui , Xiao Jingnan , Ding Shidong , Zhou Shiming , Shen Zhenhua , Han Quanquan 
Published: September 2023

ABSTRACT
Leaking of drilling fluid problem due to leaking of well during drilling and completion process has dramatically affected the cost of well. In leaking well, plugging operations for achieving good pressure bearing ability and preventing lost cement slurry are required treatments before the cementing work. In order to avoid plugging operations and reduce cost, a new balanced cementing by using foam cement slurry was proposed. In addition, a high-temperature foam cement slurry system is developed and corresponding operation method is carried out. Foam cement slurry contains the advantages of low density, high strength, expansibility, good mud cake cleaning, high flow resistance in pores and fractures of formation. Which can effectively mitigating loast of cementing slurry and improving the cementing quality. This technology has been used in field and the results show that it dramatically improves the excellent rate of cementing. With no plugging operations, the time of well completion can be reduced by 7 days in average. It has important reference values for cementing in leaking wells with no pressure-bearing plugging.

INTRODUCTION
The density of foam cement slurry with independent tiny bubbles can be much more lower than normal low density cement slurry (Wang et al., 2022). The foam cement rock is also in high strength and good expansibility (Hu et al, 2012). Foam cement slurry plays an excellent cementing performance in oil and gas wells with complex conditions (Xiao et al., 2016). Its high viscosity can increase displacement of drilling fluid and cleaning of the mud cake on well wall. Cementing with foam cement slurry can significantly improve the cementing quality and sealing ability of annulus (Lu et al, 2017). Foam cementing technology is widely used in shale gas wells in Europe and North America. In the Eldfisk Oilfield and Chichimene Oilfield, cementing with foam cement slurry is mainly used to improve the displacement efficiency of drilling fluid and sealing capacity wells with hydraulic fracturing operations (Green et al, 2003; Vela et al., 2020). The work conducted by Odden et al., (2020) and Ahmady et al. (2020) show that foam cement slurry preventing shrinkage of volume during the curing process and increasing the sealing ability of at interfaces of cement sheath. Fidan et al. (2003) studied the advantage of foam cement slurry in preventing channeling of coal bed gas in annulus.
The Influence of Activation Methodologies on the Rheological and Filtration Characteristics of Cyprus Smectites for Potential Use as Low Density Solids in Drilling Fluids. A Case Study of Polycanthos Quarry
Authors: Ramsis Youstina , Sarris Ernestos , Papaloizou Loizos , Gravanis Elias , Vattis Demetris 
Published: September 2023

ABSTRACT
In this work, we investigate the suitability of Cyprus bentonite as low-density solid additive for drilling fluids. Bentonite samples were obtained from a quarry owned by Hellenic mining company Ltd. Samples were mechanically processed to a size &lt;63μm. The processed material was activated with Na2CO3 using (i) dry, (ii) wet, and (iii) thermal conditions. The samples were activated with different percentages of soda ash and for different curing times prior to experimentation with the aim to investigate optimum soda ash quantity and activation time. With thermal activation we increase the cation exchange reaction for faster activation results. Standard tests for the rheological behavior and filtration properties of the clay suspensions were performed. Results indicate that the quality of clay suspensions, which are rich in non-clay minerals (impure), improve to a certain point after the treatments are applied. Even though the rheological and filtration characteristics improve, there is room for improvement with respect to reaching the desired API standards. The reason for the low-quality results appears to be the impurities that are inherent in the material and the K+ cations that act as swelling inhibitors. Future improvements could be the use of purification methods or chemically process the activation methods with intermediate cation exchange before full sodium activation.

INTRODUCTION
Increasing worldwide concerns about the energy demands while at the same time the relatively new European Green Deal, which was approved in 2020, has led the hydrocarbon operators to turn their focus in the recovery of environmentally friendly resources like natural gas. The reason for this is the reduction of the greenhouse gas emissions targeting at least 50% by 2030 to compare with the 1990 levels which were considerably lower. To reach such a goal the only alternative is to replace a significant amount of energy production coming from coal and petroleum with natural gas thereby efficiently reducing CO2 emissions in the atmosphere (Gravanis and Sarris, 2023).
Peran Pemerintah Dalam Meningkatkan Transaksi Dan Kerjasama Ekonomi
Authors: Winata Rani 
Published: September 2023

In connection with the development of the times, Indonesia is currently conducting international transactions and cooperation that aims to be able to prosper the community. This research was conducted with the aim of knowing the government's role in international economic transactions and cooperation. The research was carried out in the form of descriptive qualitative by collecting data using literature and summarizing the results of theories or opinions that had been done previously. The results show that Indonesia has made progress in the economic sector which has made the country prosperous. In connection with the existence of bilateral transactions and cooperation, the government plays an active role in this cooperation, where the exports and imports that can be carried out by the government to establish this cooperation make all parties mutually beneficial. The government uses fiscal policy by imposing tariffs on every exported or imported goods. Keywords: role of government, transactions, international cooperation
Derivados del Nylon 3 con grupos laterales alcoxicarbonilos ramificados y cíclicos
Authors:   , García Álvarez Montserrat 
Published: September 2023

El presente trabajo se ha centrado en la síntesis, caracterización y estudio estructural de poli(alfa-alquil-beta-L-aspartato)s con grupos laterales ramificados y cíclicos.<br/><br/>	Se han sintetizado los monómero: (S)-4-alcoxicarbonil-2-azetidinonas cuya síntesis se basa en la transesterificación de la beta-lactama del éster bencílico del ácido L-aspártico con el correspondiente alcohol.<br/><br/>	Se han establecido las condiciones óptimas de la polimerización aniónica por apertura del anillo de lactama, haciendo especial énfasis en el papel que ejerce la polaridad del solvente. En concreto el estudio se ha efectuado sobre la obtención del poli(alfa-isobutil-beta-L-aspartato).<br/><br/>	Se ha investigado la influencia de las condiciones de polimerización sobre la microestructura de los poli(alfa-isobutil-beta-D,L-aspartato)s obtenidos a partir de mezclas de monómeros enantiómeros. Se ha estudiado la conformación en disolución y la estructura cristalina en estado sólido, mediante difracción de rayos X, de los estereocopolímeros en relación con los polímeros ópticamente puros.<br/><br/>	Se han sintetizado una serie de poli(alfa-alquil-beta-L-aspartato)s nuevos con grupos alquilo ramificados y cíclicos, según las condiciones óptimas de polimerización establecidas para el derivado isobutílico. Se ha efectuado el análisis térmico de todos los polímeros y el estudio de la conformación en disolución por resonancia magnética nuclear y por dicroismo circular, detectando las transiciones de conformación.<br/><br/>	Mediante la técnica de difracción de rayos X se ha analizado el comportamiento estructural de la familia de poli(alfa-alquil-beta-L-aspartato)s sintetizada, estableciendo la comparación con los miembros de esta familia con grupos laterales lineales.<br/><br/>	Se ha llevado a cabo el análisis térmico dinamomecánico de los poli(alfa-alquil-beta-L-aspartato)s mediante la técnica de DMTA. Se han determinado las transiciones características para cada miembro y se ha establecido la correlación entre la relajación estructural de los polímeros y la constitución de la unidad repetitiva.<br/><br/>	Por último, se ha realizado el estudio de la degradación por ultrasonidos de los poli(&#61537;-alquil-&#61538;-L-aspartato)s y de ciertos poliglutamatos, de forma que se han establecido las características generales de la degradación, así como la influencia que puede ejercer la estructura de la cadena principal y lateral sobre los resultados de dicha degradación.
Manajemen Kepala Sekolah Dalam Meningkatkan Mutu Pendidikan Sekolah Menengah Kejuruan di SMK Bina Warga Bandung
Authors: Komara Endang , Mulyanto Agus , Miladiah Sofa Sari , Sugandi Nendi , A. Suganda A. Suganda 
Published: September 2023

Penelitian ini bertujuan mengetahui bagaimana manajemen kepala sekolah dalam meningkatkan mutu pendidikan Sekolah Menengah Kejuruan di SMK Bina Warga Bandung. Metode penelitian ini menggunakan metode kualitatif dengan pendekatan deskriptif. Hasil penelitian ini menunjukkan Peran kepala sekolah dalam meningkatkan mutu di sebuah satuan Pendidikan khususnya di SMK Bina Warga Bandung diantaranya yakni sebagai edukator, manajer, administrator, dan supervisor. anajemen kepala SMK Bina Warga merupakan entitas yang membimbing seluruh stakeholder sekolah untuk mengedepankan mutu dan kualitas pembelajaran melalui kepemimpinan yang ideal sehingga membentuk ikatan harmoni dan menjadikan berbagai sistem berjalan dengan sempurna.
An Analysis Of Factors Affecting English Department Students In Thesis Writing THESIS WRITING
Authors: Sandiarsa S. K. Dedy , Hanan Ahmad 
Published: September 2023

This study aimed to analyze factors affecting students in writing thesis. This research was qualitative research with descriptive design. The participants of this research were 20 students of the eighth semester students of English Department Program at FBMB UNDIKMA 2022/2023. The researchers used questionnaire and interview as the instruments. The instruments were focused on the three factors: psychological, sociocultural and linguistics factors. Based on the result of questionnaire, it showed that in psychological factor the students obtained 75% score, meanwhile in sociocultural factor the students obtained 71% score, and the highest factor affecting students in writing thesis was linguistic factor which reaching the score of 80%. Based on the average of those three factors showed that the students obtained 76% score; it means that the students have high score criteria. Moreover, based on the interviews showed that there were no students answers disagree toward the questions of interview. Alternatively, it can be concluded that the result of questionnaire and interview was matched. Consequently, it can be suggested that, the eighth semester students of English Department Program at FBMB UNDIKMA have to pay more attention in linguistic factor, since this factor was the highest percentage that can interfere graduation process.
Tanda Mitos Keabadian Pada Film 17 Selamanya Karya Hanung Bramantyo dan Implikasinya Pada Masyarakat
Authors: Nisfiyah Lailatin , Nugraha Moh. Alfian Setya 
Published: September 2023

Masyarakat masih mempercayai mitos. Kepercayaan masyarakat terhadap mitos masih kental hingga saat ini. Mitos atau mite adalah sesuatu yang berasal dari masyarakat diturunkan mulut ke mulut, generasi ke generasi, dipercayai sebagai adat yang harus dihormati. Mitos berhubungan dengan sejarah, tata karma, dan sosial. Fenomena yang sering terjadi adalah mitos mengenai keabadian, ada yang mengatakan bahwa jika mengkonsumsi air tertentu di sebuah daerah yang dipercayai akan awet muda, sembuh dari penyakit, dan dilancarkan usahanya, biasanya hal ini disebut air sumber berkah. Mitos masih bersentuhan langsung dengan masyarakat meskipun peradaban sekarang sudah lebih maju. Tujuan penelitian ini adalah untuk mengetahui tanda-tanda mitos keabadian pada film 17 Selamanya karya Hanung Bramantyo menggunakan teori semiotika Roland Barthes. Roland Barthes membagi teorinya menjadi tiga unsur yaitu denotasi, konotasi, dan mitos. Tanda-tanda yang akan dicari disajikan dalam bentuk foto adegan yang dilengkapi keterangan di bawahnya. Penelitian ini menggunakan metode penelitian kualitatif deskriptif. Pendekatan kualitatif deskriptif adalah pendekatan melalui proses mendeskripsikan kata, frasa, kalimat, fenomena alam, sejarah, sosial, dan mencari narasumber untuk mendapatkan data yang diinginkan. Penelitian ini juga menggunakan teknik pendekatan hermeneutik artinya teknik yang memiliki penafsiran lebih mendalam mengenai objek yang diteliti. Hasil penelitian ini adalah tanda-tanda mitos keabadian pada film 17 Selamanya karya Hanung Bramantyo yang dihubungkan dengan fenomena atau implikasi terhadap masyarakat di Indonesia
Problematika Guru Dalam Pemanfaatan Media Pembelajaran
Authors: Sihombing Yenni , Haloho Bongguk , Napitu Ulung 
Published: September 2023

Abstract. Revolutions in science and technology, changes in society, understanding how children learn, advances in communication and information media and so on give their own meaning to educational activities. This challenge is one of the important foundations of a technological approach in the management of education and learning. The development of science and technology is increasingly encouraging renewal efforts in the utilization of technological results in the learning process. Teachers are required to be able to use the tools that can be provided by the school, and it is possible that these tools are in accordance with the developments and demands of the times. Utilization of learning media is also a must for every teacher so that it helps in clarifying learning material and arousing students' interest and motivation in learning. However, in reality there are still many teachers who have not been able to utilize learning media, teachers are also less innovative and creative in using learning media, meaning that teachers cannot work in using learning media.Keywords: Teacher Problems; Utilization of Learning Media Abstrak. Revolusi ilmu pengetahuan dan teknologi, perubahan masyarakat, pemahaman cara belajar anak, kemajuan media komunikasi dan informasi dan lain sebagainya memberi arti tersendiri bagi kegiatan pendidikan. Tantangan tersebut menjadi salah satu dasar pentingnya pendekatan teknologis dalam pengelolaan pendidikan dan pembelajaran. Perkembangan ilmu pengetahuan dan teknologi semakin mendorong upaya -upaya pembaharuan dalam pemanfaatan hasil-hasil teknologi dalam proses belajar. Para guru dituntut agar mampu menggunakan alat-alat yang dapat disediakan oleh pihak sekolah, dan tidak menutup kemungkinan bahwa alat-alat tersebut sesuai dengan perkembangan dan tuntutan zaman. Pemanfaatan media pembelajaran juga merupakan suatu keharusan bagi setiap guru sehingga membantu dalam memperjelas materi pembelajaran dan membangkitkan minat dan motivasi siswa dalam belajar. Namun pada kenyataannya masih banyak guru yang belum mampu untuk memanfaatkan media pembelajaran, guru juga kurang inovatif dan kreatif dalam pemanfaatan media pembelajaran artinya guru belum bisa bekerja dalam menggunakan media pembelajaran.Kata Kunci : Masalah Guru; Pemanfaatan Media Pembelajaran.