bluuebunny/crossref_metadata_2025_split huggingface dataset:
Strategic Design and Analysis of Yielding Pillars: A Case Study from Deep Underground Mining at Vale's Copper Cliff Mine
Authors: McBride M. 
Published: August 2024

ABSTRACT:
The process of modelling and design of a yielding pillar is a common necessity in rock mechanics as applied to deep underground mines. There are numerous reasons to design a pillar to yield. A large-scale example would be the convergence of two mining fronts, with the goal of managing the yielding of the merge zone and minimizing worker exposure to the yielding stress front. A stope-scale example would be in the typical primary-secondary stope mining sequence, where secondary stopes are intentionally left behind to support an ever-increasing stress-load. As the leading primary stopes are mined, the secondary stopes eventually yield, which are then mined under relatively low-stress, aseismic conditions.
In this analysis, a small-scale example of a yielding pillar will be modelled and compared to results from three case studies. When preparing a stope for production blasting, it is common to take long-wall slashes in the bottom sill. This is generally intended to open the bottom of the stope to its full floor area, increasing the void available for the initial production blast, and allowing ITH drill holes to break-through into the back, which can then be surveyed. These surveyed breakthrough holes allow for greater control and quality assurance during production blasting. Finally, the long-wall slashes increase the recovery rate for the stope block since the blasted walls represent ore that would otherwise be left behind as a pillar.
All three case studies presented are taken from Vale's Copper Cliff Mine, at a depth of 5,130 ft. The rockmass is quartz diabase of approximately 138 MPa uniaxial compressive strength and with blocky structure, but good quality (Approximately 90 rock quality designation). The long-wall slashes range in their cut depth between 10-14 ft and are blasted against pre-existing 20-22 ft stable rib pillars that separate the parallel orebody crosscuts. All three case studies are from stopes in the same area of the mine and therefore share a similar in-situ primary stress of 70 MPa. However, the overall geometries are different in each case. A Map3D model based on a linear-elastic constitutive model was used to characterize pillar average stress. The pillar dimensions were then compared using the Lunder & Pakalnis (1997) empirical method. All three cases have been discussed with reference to these two design methodologies and the actual pillar behavior in each case is compared to those predicted results.
The results show that the employed design methodologies are adequate for the purpose of this application and accord with site experience regarding pillar performance in this small-scale scenario.
Experimental Study of Fracture Propagation of CO2 Fracturing in Conglomerate Reservoirs
Authors: Li Jie , Dong Jingfeng , Wang Bin , Zhou Peiyao , Li Gensheng , Zeng Changhui , Zhang Fengjuan , Liu Kaixin , Ding Xiang , Wang Li Kun 
Published: August 2024

ABSTRACT:
Employing CO2 as a fracturing fluid could effectively limit the hydration swelling of clay minerals and reduce the damage to conglomerate reservoirs. The gravel particles increase the heterogeneity of conglomerate, making fracture propagation more complex than in sandstone and shale. True triaxial fracturing experiments were performed using artificial conglomerates. The initiation pressure, fracture morphology and fracture surface characteristics were analyzed. Studies showed that the heterogeneity of the conglomerate greatly affected fracture initiation and propagation. Compared with hydraulic fracturing, CO2 fracturing has significant advantages, such as degrading initiation pressure and creating more complex fractures. The fracture induced by CO2 mostly appeared as deflection, making the fracture surface rougher. The stress difference greatly influenced the fracture propagation. As the stress difference grew, the fracture morphology shifted from complex to simple, and the expansion mode shifted from deflection to penetration. Increasing the injection rate can lead to a more balanced fracture propagation. However, large injection rates lead to higher initiation pressure. Research results are expected to provide a theoretical basis for CO2 fracturing and help promote the integration of conglomerate reservoir exploitation and CO2 storage.

1. INTRODUCTIONS
Mahu conglomerate oil reservoir is by far the world's first whole conglomerate oil field with huge resource potential (Hou et al., 2018). Since 2015, the development method of volumetric fracturing has been adopted to realize effective mobilization (Rafieepour et al., 2020, Lin et al., 2022, Zhang et al., 2024a, and Zhang et al., 2024b). But the single well EUR of some sensitive reservoirs is low and the annual decline rate is large. The analysis results show that one of the reasons for the faster decline in production and pressure is the high content of water-sensitive minerals in the reservoir rock, which soften in contact with water and cause high damage to permeability (Xv et al., 2019). Therefore, CO2 is considered as a fracturing medium to explore the low-injury fracturing mode without or with less water (Shen et al., 2010, Wang et al., 2012).
Numerical Prediction of Thermo-Mechanical Spalling Around a Deep Nuclear Waste Repository in Crystalline Rock
Authors: Lisjak Andrea , Mahabadi Omid , Ha Johnson , Ivars Diego Mas 
Published: August 2024

ABSTRACT:
The focus of this study is on stress-driven rock damage potentially developing around the tunnels and deposition boreholes of a planned underground nuclear waste repository at the Forsmark site in Sweden. This type of damage is commonly referred to as "spalling" or "brittle failure". In hard, crystalline rocks, such as those at the Forsmark site, spalling typically manifests itself in the form of extensional (Mode I) cracking parallel to the excavation boundaries followed by buckling of thin rock flakes. During the construction phase of the repository, mechanical spalling may be induced by overstressing (under unconfined conditions) of the excavation surface periphery. During the operational phase, thermal spalling may develop due to additional thermo-elastic stresses forming in response to the increasing rock mass temperature field induced by the heat-emitting spent nuclear fuel. Since rock failure may negatively affect the long-term isolation properties of the host rock within the multi-barrier disposal concept to be adopted at the Forsmark site, prediction of its occurrence, location, and extent is critical for an effective repository design and long-term safety. In this study, the response of underground structures was studied using Geomechanica's Irazu software, which is novel 3D coupled thermo-mechanical simulator based on the finite-discrete element method (FDEM). It is the first numerical study to date that explicitly captures both mechanical and thermal fracturing processes while using the latest repository design and site-specific geomechanical input data. A sensitivity study is performed to investigate different combinations of rock mechanical properties, in-situ stresses, and deposition tunnel geometry on the host rock behaviour. Rock mass deconfinement is shown to promote the development of tensile damage in the tunnel sidewalls and floor with fracture surfaces growing parallel to the excavation boundaries. The negative effects deriving from the adoption of a relatively narrower tunnel cross-section and from an increase of horizontal in-situ stresses are highlighted. Thermo-mechanical analyses capture the rock mass behaviour following an increase of borehole surface temperature to 100°C. Numerical results indicate that the temperature evolution is affected by the shape of the underground cavities and their distance from the heated boreholes. The coupled thermal expansion of the rock induces additional stresses which, in turn, promotes further damage. Despite this increase, however, the total amount of induced rock damage at final conditions remains relatively low.
Frontiers in Fiber Optic Sensing Beyond Seismic Data
Authors: Martin Eileen , Yuan Shihao , Snyder Tomas , Homa Daniel , Dejneka Zack , Pickrell Gary , Wang Anbo , Theis Logan 
Published: August 2024

ABSTRACT:
Fiber optic technologies such as distributed temperature sensing, distributed strain sensing and distributed acoustic sensing are becoming increasingly commercially available for rock mechanics and soil mechanics studies. However, for applications that require reliable quantitative mapping of subsurface saturation or ice content, these strain or seismic methods must often be augmented with electrical and magnetic methods. Some examples include monitoring the role of saturation in slope stability, as well as geomechanical monitoring in permafrost regions (e.g. for well integrity or infrastructure). Our team has developed novel fiber optic distributed magnetic sensing fibers, which include embedded rods of materials that expand in the presence of magnetic fields, a change known as magnetostriction. These fibers include a single mode core, so they can be connected end-to-end with standard fiber optics, and measured using the same distributed acoustic sensing optical interrogator unit. This talk will cover the design, manufacturing, and practical use of these fibers with multiple magnetostrictive materials embedded. We will show theoretical and numerical models of the fiber response that explain features observed in controlled laboratory experiments, as well as techniques (e.g. Bragg gratings) to improve sensitivity. We will show some initial field trial results and potential deployment styles for multi-physics fiber optic sensing as we move forwards.
Drilling for Opportunities: The Geothermal Technologies Office
Authors: Jones Kevin , Boyd Lauren 
Published: August 2024

ABSTRACT:
In 2023, the United States (U.S.) remained the leader in installed geothermal capacity with almost 4 gigawatts (GW) of electricity-generating capacity installed, representing around 24% of the world's total capacity. The lead federal agency in charge of advancing the U.S. geothermal sector is the U.S. Department of Energy's (DOE) Geothermal Technologies Office (GTO), which is supporting a portfolio of innovative technologies advancing geothermal exploration, development, and deployment. GTO and partners research, develop, and validate cost-competitive geothermal technologies and tools to help make geothermal more affordable, and to locate, access, and develop geothermal resources within the United States.
Implementasi Pendampingan Digital Branding dan Packaging pada UMKM Omah Dayang
Authors: Anissa Feby Widya Prawesti  , Ardian Christyanti  , Ayu Novita Sari  , Sonia Ayu Cahyani  , Zainal Abidin Achmad  
Published: August 2024

Assistance Activities UMKM in improving Branding and Packaging at UMKM Omah Dayang this aims to improve the quality UMKM because in digital branding products, development is carried out such as product rebranding, marketing and design. Products that are rebranding to ade value to the product UMKM Omah Dayang. Branding improvement activities UMKM Omah Dayang carried out with three stages, namely the first packaging design, logo updates and also social media. The packaging design process is carried out to increase consumen attractiveness, because attractive packaging can have high selling power. The next is social media which is carried out so that the product is more attractive UMKM Omah Dayang can be reached outside the Blitar City area and Increase sales.
Pelatihan Digital Marketing pada Produsen Sabun Cuci Piring Rumahan di Kebumen
Authors: Saryatun Saryatun  , Joko Purnomo  , Subur Yuswanto  , Eko Pria Kusuma  
Published: August 2024

This community development activity aims to help MSMEs penetrate the digital market. Team provided digital marketing training to the home dishwashing soap industry on December 17, 2023, at Gemintang Café and Resto. Fifteen participants, all dishwashing soap producers from Kebumen Regency, attended. The training aimed to increase product sales through lectures, practice sessions, and Q&A. The one-day event covered product photography, online marketing techniques, and market expansion strategies. Participants were highly enthusiastic and actively engaged with the material. They learned to take attractive product photos, identify suitable marketplaces, and use marketing tricks on platforms like WhatsApp, Facebook, Instagram, and TikTok. The training also highlighted new cooperation opportunities with agencies and institutions, contingent on having legal and accountable permits.
Penerapan Standar Pelayanan Publik di Desa Gesikan
Authors: Bekti Mayasari  , Martinus Budiantara  
Published: August 2024

Pemerintah mempunyai kewajiban dalam memberikan pelayanan unntuk masyarakat ditingkat pemerintah pusat dan daerah dengan baik. Dalam melaksanakan standar pelayanan publik, para aparatur pemerintah diminta agar dapat bekerja dengan professional, efektif, dan efisien. Salah satu pelayanan publik oleh pemerintah ditingkat paling dasar adalah pemerintah kelurahan. Salah satu pelayanan pemerintah di tingkat desa adalah di Desa Gesikan kecamatan Gantiwarno Kabupaten Klaten. Artikel ini akan membahas mengenai penerapan standar pelayanan publik di Desa Gesikan menggunakan metode deskriptif kualitatif.

Berdasarkan hasil pengabdian masyarakat yang dilakukan, dapat disimpulkan bahwa standar pelayanan publik di Desa Gesikan sudah berjalan baik yang didasarkan pada dasar hukum, persyaratan, sistem, mekanisme dan prosedur, produk pelayanan, biaya, waktu penyelesaian, Jumlah pelaksana, kompetensi pelaksanaan, sarana dan fasilitas, jaminan keamanan dan keselamatan pelayanan, penanganan pengaduan saran dan masukan, pengawas internal, jaminan pelaksana, evalusai kinerja pelaksanaan.
Pendampingan Penggunaan Aplikasi E-Monev di SETDA Kabupaten Lombok Tengah
Authors: Muliana Muliana  , Saeful Hamdi  , Sunardi Sunardi  
Published: August 2024

Pada umum nya yang terjadi di kantor administrasi pembangunan di kabupaten Lombok Tengah mengenai penggunaan aplikasi e-monev pegawai disana masih kurang memahami cara mengaplikasikan aplikasi e-monev sehingga penulis berinisiatif membuat pelatihan pendampingan penggunaan aplikasi e-monev tersebut. Mulai dari alur login agar para staf atau pegawai di bagian administrasi pembangunan bisa memulai untuk menggunakan aplikasi e-monev tersebut.aplikasi e-monev bisa di gunakan sebagai pelaporan data realisasi dari hasil pemantauan pelaksanaan rencana kerja.dan aplikasi tersebut juga di gunakan untuk melakukan penghimpunan data pegawai yang ada pada tempat penggunaan aplikasinya. Selain itu juga aplikasi ini bisa melakukan penambahan data pegawai . seperti misalnya melakukan hal yang berkaitan dengan cara penggunaan aplikasi e-monev itu sendiri.
Bimbingan Belajar Bahasa Inggris bagi Siswa-Siswi Sekolah Dasar
Authors: Susanto Susanto  , Yahmun Yahmun  
Published: August 2024

English tutoring program comes to provide the English tutor for elementary students as one strategy to improve quality of English communication. The purposes of this program were to introduce the basic materials for children and to pronounce the basic vocabularies and sentences related to the daily life.This program was held at RT 09 and RW 04 Ngrayung, Ngadirenggo Village Pogalan-Trenggalek (East Java) and the praticipants were 20 students of class 4-6. The program was done during 3 months. The method used consisted of socialization, workshop and tutorial.The results showed that the students were interested in learning English. In the early meetings, students found difficulties to pronounce the vocabularies. The students were able to pronounce after 3 meetings even some students still make mistakes. In learning English; students were active in playing games, singing, spelling, pronouncing and role play. The results of pre test showed that only one student passed in the test, while nineteen students failed. The average score was 57.35. This means that the students must follow the English program. The results of post test showed that twenty students passed in the test. It was shown in the individual score. The data revealed that 8 students got 60-69 while 12 students got 70-79. The average score was 70. Therefore; the English tutoring program for elementary students can improve their learning achievement in English.
Sosialisasi Pembuatan Kompos Organik dari Sampah Rumah Tangga
Authors: Mahmud Basuki  , Sofiyanurriyanti Sofiyanurriyanti  , Yusi Hidjrawan  , Rita Hartati  , Marlinda Marlinda  , Nissa Prasanti  , Kasmawati Kasmawati  
Published: August 2024

Kegiatan pengabdian kepada masyarakat (PKM) merupakan media penyampaian ilmu pengetahuan dan teknologi kepada masyarakat. Pelaksanaan pengabdian ini dilakukan oleh Dosen Program Studi Teknik Industri, Fakultas Teknik, Universitas Teuku Umar. Pelaksanaan PKM ini bertema Sosialisasi Pembuatan Kompos Organik dari Sampah Rumah Tangga. Tujuan PKM ini adalah untuk meningkatkan kesadaran masyarakat dalam menanggulangi dan mencegah kerusakan lingkungan akibat sampah rumah tangga yaitu dengan sosialisasi kepada masyarakat terhadap pentingnya memanfaatkan sampah rumah tangga untuk dijadikan kompos organik. Metode yang digunakan dalam pengabdian ini yaitu metode sosialisasi yang meliputi ceramah, presentasi, diskusi, dan tanya jawab. Peserta PKM terdisi dari pimpinan dayah, ibu-ibu, dan Santri di Dayah Madinatuddiniyah Darul Huda Seramboe Madinah Desa Ujong Patihah. Peserta PKM mengikuti sosialisasi yang berupa ceramah, diskusi, dan tanya jawab mengenai pembuatan kompos organik dari sampah rumah tangga. Luaran dari PKM ini adalah membuka wawasan masyarakat sebagai generasi muda yang hidup di era milenial dan dalam mengelola sampah rumah tangga, diharapkan agar dapat lebih meningkatkan pemanfaatkan limbah rumah tangga.
Makna Takdir dalam Al-Qur’an
Authors: Murdianto Murdianto , A'yun Qurrota 
Published: August 2024

Takdir berarti ketentuan atau kekuasaan. Takdir merupakan sebuah ketetapan Allah SubhÃ¢nahu wa Taâ€™ala yang meliputi segala kejadian yang terjadi di alam ini, baik itu mengenai kadar atau ukurannya, tempat maupun waktunya. Penelitian ini bertujuan untuk mengetahui penafsiran takdir dalam Alquran menurut M. Quraish Shihab dalam kitab Tafsir Al-Mishbah serta mengetahui relevansi penafsiran M. Quraish Shihab tentang takdir dalam kehidupan kontemporer. Jenis penelitian yang digunakan adalah penelitian kepustakaan (Library Research).
Teknik pengumpulan data yang digunakan adalah teknik dokumentasi, yaitu dengan cara mengumpulkan data yang berhubungan dengan objek penelitian dari kitab tafsir dan buku-buku yang relevan dengan pembahasan.
Metode penelitian yang digunakan adalah deskriptif analitis yaitu memberikan gambaran dan pemaparan tentang tafsir makna takdir yang di tafsirkan oleh M. Quraish Shihab dalam Tafsir Al- Mishbah.
Hasil dari penelitian ini adalah bahwa takdir merupakan ketentuan Allah yang mutlak, mengatur segala urusan termasuk dalam membatasi dan memberi rizki serta menentukan suatu ukuran pada segala sesuatu. Sedangkan kontekstualisasi dalam kehidupan kontemporer yakni bahwa takdir Allah juga bisa dirubah oleh manusia, karena manusia diberi kebebasan dalam berbuat dan bersikap dengan memaksimalkan akal yang dimilikinya untuk merubah keadaan mereka dari keburukan kepada kebaikan, namun kebebasan tersebut terbatasi oleh sunnatullah yang berlaku kepada setiap penciptaan-Nya.
Optimalisasi Wawasan tentang Media Sosial & E-commerce Sebagai Strategi Unggulan dalam Branding UMKM di Desa Bicak
Authors: Anisa Putri Maharani  , Putri Kurnia Sari  , Iola Riris Simanjuntak  , M. Arief Safi'i  , Syarief Hidayat  
Published: August 2024

Bicak Village is a village with promising economic potential, especially through the Micro, Small and Medium Enterprises (MSME) sector. However, challenges in marketing and branding local products are still a significant obstacle for MSMEs in this village. This article aims to optimize the use of social media and e-commerce as superior branding strategies to increase the competitiveness of MSMEs in Bicak Village. The method used in this article focuses more on a qualitative analysis approach, namely data collection, observation, and direct interviews with MSME actors. The results found are exploring how MSME actors can utilize digital platforms to increase product visibility, reach a wider market, and strengthen their image. brand. The research results show that implementing this digital strategy will not only increase sales, but will also have a positive impact on the sustainability of MSME businesses in Bicak Village.
Pengembangan Media Pembelajaran Berbasis Microlearning pada Edukasi Keselamatan dan Kesehatan Kerja (K3) untuk Perkantoran
Authors: Amiruddin Ja’far , Mahir Imam , Maharani Nadira 
Published: August 2024

Latar Belakang: Sasaran pengunaan media pembelajaran ini adalah para pekerja perkantoran dan pengelola gedung

Tujuan: Penelitian ini bertujuan untuk mengembangkan sebuah platform pembelajaran online menggunakan metode pembelajaran mikro (microlearning) dalam topik Keselamatan dan Kesehatan Kerja (K3) khususnya untuk lingkungan perkantoran. Platform ini akan mencakup berbagai elemen seperti video, kuis, infografis, dan PDF interaktif. Selain itu, penelitian ini juga akan mengevaluasi keefektifan dan kebermanfaatan dari platform pembelajaran berbasis microlearning ini dalam konteks K3 di lingkungan perkantoran.
Metode: Metode penelitian yang diterapkan adalah Research and Development (R&D) dengan menggunakan ADDIE Model (Analysis, Design, Development, Implementation, & Evaluation). Beberapa topik yang dijelajahi dalam pengembangan media pembelajaran ini meliputi ergonomi, pencahayaan, perilaku hidup sehat, serta kewaspadaan terhadap bencana. Dilakukan juga validasi terhadap hasil pengembangan media pembelajaran tersebut.
Hasil: Rata-rata penilaian untuk semua aspek dari validasi oleh ahli adalah sebagai berikut: penilaian ahli materi mencapai 4.62, yang termasuk dalam kategori sangat layak, dan penilaian ahli media mencapai 4.41, juga termasuk dalam kategori sangat layak. Sementara itu, rata-rata penilaian dari hasil uji coba perorangan adalah 4.51, dan dari hasil uji coba kelompok kecil adalah 4.4, keduanya termasuk dalam kategori sangat layak.
Kesimpulan: Berdasarkan evaluasi yang telah dilakukan, dapat disimpulkan bahwa media pembelajaran berbasis microlearning yang dikembangkan untuk materi K3 di lingkungan perkantoran sangat cocok untuk digunakan dalam pendidikan bagi para pekerja perkantoran dan pengelola gedung.