bluuebunny/crossref_metadata_2025_split huggingface dataset:
IMPLEMENTASI FMEA (FAILURE MODE AND EFFECT ANALYSIS) PADA MESIN BUBUT KONVENSIONAL DI PT. RAJA AMPAT INDOTIM
Authors: Utomo Alif Imam , Santoso Deri Teguh 
Published: January 2023

Abstrak: Seiring berjalannya waktu, kondisi fasilitas yang digunakan untuk membantu proses produksi pada PT. Raja Ampat Indotim mengalami penurunan kemampuan dan fungsi yang akan mengakibatkan kerugian, salah satu fasilitas yang sering digunakan yakni mesin bubut konvesional. Namun, tindakan perawatan yang dilakukan di PT. Raja Ampat Indotim dinilai masih kurang efektif, dikarenakan perawaatan yang dilakukan dengan mengadakan tindakan perawatan setelah terjadinya kerusakan pada semua komponen. Maka tujuan penelitian ini adalah membahas tentang implementasi metode FMEA pada mesin bubut konvensional yang berada di PT. Raja Ampat Indotim. Setelah dilakukan analisis dengan metode FMEA (Failure Mode and Effect Analysis) didapatkan hasil yaitu terdapat enam komponen pada mesin bubut konvensional yang perlu mendapat perhatian untuk tidakan perawatan, item tersebut adalah chuck, sirkulasi oli, taper, v-belt and pulley, shaft and bushing, baut dan mur dengan delapan belas jenis kegagalan yang terjadi. Untuk tindakan perawatan yang dipilih dapat menggunakan tindakan perawatan korektif dan tindakan perawatan preventif dikarenakn nilai RPN yang diperoleh mempunyai nilai yang rendah dan menengah, tidak ada yang mempunyai nilai RPN diatas 300. Kata kunci: FMEA, Tindakan Perawatan, Mesini Bubut Konvensional
Pengaruh Penggunaan Berbagai Jenis Material Elektroda Busi Terhadap Performa Mesin Dan Bentuk Nyala Api Pada Mesin Bensin 113 cc
Authors: Al Banjari Muhammad Arsad 
Published: January 2023

Penelitian ini bertujuan untuk mengetahui pengaruh performa mesin dan bentuk nyala api dengan berbagai jenis material busi pada motor injeksi 113 cc. Penelitian ini dilaksanakan dengan metode experimen. Jenis material elektroda busi yang digunakan pada penelitian ini yaitu nikel, iridium, dan tembaga. Penelitian ini membandingkan hasil performa mesin dari ketiga busi tersebut menggunakan dynotest. Putaran mesin yang diamati yaitu pada 3000 RPM - 5000 RPM. Untuk melihat bagaimana bentuk nyala api serta warna yang dipercikan oleh busi digunakan alat yaitu spark plug tester pada kondisi 3000 RPM dan 5000 RPM. Hasil penelitian menunjukkan bahwa bentuk nyala api berpengaruh terhadap performa mesin daya dan torsi.Pada 3000 RPM, ukuran luas percikan api pada busi tembaga yaitu 0,542 mm sedangkan pada busi nikel sebesar 0,762 dan busi iridium 1,137 mm. Pada 5000 RPM, ukuran luas percikan api pada busi tembaga yaitu 0,6 mm sedangkan pada busi nikel sebesar 0,973 dan busi iridium 1,239 mm. Luasan api tersebut berpengaruh pada performa mesin. Pada 3000 RPM performa busi tembaga tidak jauh dengan busi nikel dan busi iridium. Pada 5000 RPM performa mesin menggunakan busi iridium paling baik sesuai dengan percikan api yang paling luas, selanjutnya busi nikel lalu busi tembaga pada urutan terbawah
PENINGKATAN MAMPU ALIR (FLUIDITY) DAN PENURUNAN NILAI SUSUTAN PADUAN Al-Cu DENGAN SEMI-SOLID RHEOCASTING
Authors: Putra Muhammad Rezki F. , Ivana Reza Taufiqi , Pratomo Danang Yugo , Syaief Adhiela Noer , Syahyuniar Rusuminto 
Published: January 2023

AbstrakIndustri otomotif sebagian besar pada penggunaan part dan komponen lainnya masih menggunakan paduan aluminium dengan proses pengecoran. Salah satu paduan dengan perlakuan panas yang baik dan karakteristik perbandingan kekuatan dengan berat jenis yang baik yaitu Al-Cu, namun dengan karakteristik demikian paduan ini juga memiliki kekurangan mampu alir dan susutan yang besar. Dalam percobaan ini melakukan proses pengecoran semi-solid rheocast denan variasi lama pengadukan menggunakan paduan al-cu sebagai bahan untuk dilakukan peningkatan mampu alir dan penurunan nilai susutan dari paduan. Dari hasil percobaan didapatkan hasil cukup baik pada mampu alir dengan penambahan panjang aliran logam dengan perbedaan ketebalan cetakan didapatkan nilai paling tinggi dilamanya waktu pengadukan 540 dengan ketebalam 1 mm;9,8mm, 1,5 mm; 15 mm,1,8mm; 17 mm, 2 mm; 22 mm. Penurunan nilai susutan yang didapat juga cukup baik dari hasil proses semi-solid rheocast menghasilkan penurunan sebanyak 48,9% dari tanpa proses rheocasting dengan yang diberikan proses rheocasting menggunakan variasi lama waktu pengadukan. Kata kunci— Al-Cu, Rheocasting, Penyusutan, Mampu Alir Abstract Most of the Automotive Industry use parts and other components still use aluminum alloys with the casting process. One of the alloys with good heat treatment and good characteristics of the ratio of strength to specific gravity is Al-Cu, but with such characteristics this alloy also has a lack of large flowability and shrinkage. In this experiment, a semi-solid rheocast casting process was carried out with various stirring times using al-cu alloy as a material to increase the flowability and reduce the shrinkage value of the alloy. From the experimental results, it was found that the flowability was quite good with the addition of metal flow length with a difference in mold thickness, the highest value was the mixing time of 540 with a thickness of 1 mm; 9.8 mm, 1.5 mm; 15mm,1.8mm; 17mm, 2mm; 22mm. The decrease in shrinkage value obtained was also quite good from the results of the semi-solid rheocast process resulting in a reduction of 48.9% from that without the rheocasting process given the rheocasting process using variations in the length of stirring time. Keywords— Al-Cu, Rheocasting, Shrinkage, Fluidity
Olfactory Stimulants for Sirex nigricornis (Hymenoptera: Siricidae) and its Parasitoid, Ibalia leucospoides (Hymenoptera: Ibaliidae), in Odors of Stressed and Bark Beetle–Colonized Pines
Authors: Shepherd William P. , Johnson Crawford W. , Sullivan Brian T. 
Published: January 2023

Abstract
We conducted studies with the native woodwasp Sirex nigricornis F. (Hymenoptera: Siricidae) in Louisiana to identify host-associated olfactory stimulants that may include attractive semiochemicals for this species as well as Sirex noctilio F., an invasive species that can attack healthy trees. Loblolly pines (Pinus taeda L.) treated with a stressing agent were felled and chipped 1–2 mo after treatment, and the chips were steam–water distilled in a Clevenger apparatus to extract volatile compounds. Using coupled gas chromatography–electroantennographic detection, we analyzed the distillates with antennae of both S. nigricornis and the Sirex parasitoid Ibalia leucospoides (Hochenwarth) (Hymenoptera: Ibaliidae) to identify olfactory stimulants. In addition, we assayed S. nigricornis antennae with synthetic mixtures containing 23 volatile compounds associated with stressed and dying pines, including pheromones of bark beetles (Coleoptera: Curculionidae: Scolytinae) that also use these hosts. Antennae of both male and female S. nigricornis responded to 29 identifiable volatiles in the distillates, whereas I. leucospoides responded to 23 volatiles. Eighteen compounds in the synthetic mixtures were olfactory stimulants for S. nigricornis. Olfactory stimulants in the woodchip distillates were predominantly hydrocarbon and oxygenated monoterpenes, and the strongest antennal stimulants among compounds in the synthetic mixtures were oxygenated monoterpenes associated with pine death and early decay (e.g., verbenone, fenchone, and terpinen-4-ol). Bark beetle pheromones (frontalin, endo-brevicomin, ipsenol, and ipsdienol) also stimulated S. nigricornis antennae. The very large number of host-associated olfactory stimulants for S. nigricornis implies that our data may offer limited assistance in targeting individual compounds for investigation as possible attractants and components for a Sirex lure.
Expression Patterns of Heat Shock Protein Genes and Antioxidase Genes in Apis cerana cerana (Hymenoptera: Apidae) under Heat Stress
Authors: Li Xinyu , Ma Weihua , Jiang Yusuo 
Published: January 2023

Abstract
Heat stress elicits the expression of various antistress proteins (e.g., heat shock proteins [HSPs] and antioxidase enzymes) in honeybees (Hymenoptera: Apidae), which are important in protecting cells from heat-induced stresses. In this study, we used real-time quantitative reverse transcription–polymerase chain reaction to analyze the expression patterns of the heat shock protein 90 (Hsp90), heat shock protein 70Ab (Hsp70Ab), peroxidase (Pod), and cytochrome P450 (Cyp450) in response of Apis cerana cerana F. to different temperatures and different heat exposure times. We observed that, with the increase of temperature and exposure time, the expression of the four genes also increased, thus confirming that heat stress can activate heat-resistant mechanisms of A. cerana cerana and that temperature and exposure time are key factors affecting the accumulation of HSPs. Our results provide information on the expression patterns of four genes during heat stress to serve as a basis for determining the mechanisms by which A. cerana cerana adapts to thermal stress.
Effect of Chlorhexidine on Immediate and Delayed Bond Strength between Resin and Dentin of Primary Teeth: A Systematic Review and Meta-Analysis
Authors: Ebrahimi Masoumeh , Majidinia Sara , Sarraf Alireza 
Published: January 2023

Objectives: The purpose of this study was to systematically review the literature and use meta-analysis to investigate whether chlorhexidine (CHX) application after acid etching as an adjunct treatment has any influence on the immediate and delayed bond strength to primary dentin.
Materials and Methods: In this review, PubMed, ISI (all data bases), Scopus and Cochrane were searched according to the selected keywords up to April 30, 2018. The full texts of all published articles that met our primary inclusion criteria were obtained. The studies were analyzed in two parts: in vitro studies that evaluated the effect of CHX application during the bonding procedures (application after acid etching) on immediate and delay dentin bond strength of resin-dentin interface.
Results: The initial search yielded 214 publications, of which 8 were selected after thorough methodological assessment. None of the clinical studies fulfilled the eligibility criteria. Our results indicated that in comparison to the control group, CHX significantly reduced immediate resin-dentin bond strength (P=0.043). These values were increased after aging (P<0.001).
Conclusion: Based on this invitro Meta-analysis CHX application, improve resin-dentin bond strength durability in primary teeth.
The Prevalence of maxillary fractures in trauma patients referred to Shahid Rajaei Hospital in Shiraz from 2011 to 2021
Authors: Daneste Hossein , Bayat Pourya 
Published: January 2023

Introduction: Maxillofacial fractures are one of the most common fractures in the body due to trauma. Maxillary fractures, especially Lefort fractures, are common fractures. The aim of this study is to evaluate the prevalence and etiology of Lefort fractures in patients referred to Shahid Rajaei Hospital during 2011 to 2021.
Materials and Method: In this cross-sectional study, 2700 patients who referred to the maxillofacial surgery department of Shahid Rajaei Hospital in Shiraz between 2011 to 2021 due to trauma and fractures of the jaw and face were examined. 903 cases were related to patients with upper jaw fracture and were included in the study. The demographic information of the patients, including age, sex, cause of trauma, and also the type of fracture, were extracted from their records. The etiology of maxilla fracture was divided into three groups: vehicle accidents, violence and interpersonal conflict, and accidents during work and sports. Finally, in order to analyze the data, it was done through statistical tests.
Results: 65% of patients were male and 35% were female. The average age of people was 38.5 years. Lefort I fracture was reported in 25% of patients, Lefort II fracture in 31% and Lefort III fracture in 11% of patients. 46% of patients had fractured maxilla due to vehicle accidents, 26% of patients due to interpersonal violence, and 27% of patients due to accidents during work and sports.
Conclusion: The prevalence of Lefort fracture in men is significantly higher than in women. In our society, injuries caused by road accidents, especially car accidents, are the most common causes of Lefort fractures. The most common type of Lefort fracture is Lefort II fracture. Of course, the cause of injury has an important effect on the pattern of injury.
Yetişkin Yaş Grubunda Kan Şekeri ve Kan Basıncı Korelasyonu Değerlendirmesi
Authors: YAMAN Burak 
Published: January 2023

Amaç: Bu çalışmanın amacı kan basıncı ve kan şekeri değerleri açısından yetişkin yaş grubundaki gönüllü bireylerin değerlendirilmesi ve kan şekeri, kan basıncı değerlerinin birbirleriyle ve yaş, kilo ve boy gibi verilerle ilişkisinin ortaya konulmasıdır.
Gereç ve yöntem: Bu çalışmada ….. şehrinde yaşayan yetişkin yaş grubundaki bilinen herhangi bir hastalığı olmayan gönüllüler randomize yöntemle seçilerek açlık kan şekeri ve kan basıncı ölçümleri gerçekleştirilmiştir. Açlık kan şekeri kapiller kan alınarak glikometre ile kan basıncı ise manuel sfigmomanometre ile brakiyal arterden ölçülmüştür.
Bulgular: Çalışmaya 190 erişkin gönüllü katılmıştır. Gönüllülerin, % 25.8’inde kan basıncı değerleri normalin üstünde iken, % 6.3’ünde kan şekeri seviyesi normalin üstünde bulundu. Açlık kan şekeri normalden yüksek olanların % 41.7’ sinin kan basıncı değerleri de normalin üstündeydi. Açlık kan şekeri ile diastolik kan basıncı arasında istatistiksel olarak anlamlı düzeyde pozitif yönde korelasyon bulundu (p=0.01, Spearman).
Sonuç: Diyabet ve hipertansiyonun nedenleri ve ortaya çıkış mekanizmaları benzerdir ve birbirini tetiklemektedir. Bu çalışmada açlık kan şekeri seviyelerinin yükselmesi ile diastolik kan basıncı değerlerinin de etkilendiği ortaya konmuştur. Sağlıklı erişkinlerde düzenli kan şekeri ve kan basıncı takibi, ortaya çıkabilecek komplikasyonları önleyebilecektir.
Poverty dynamics in Nairobi's slums; Testing for state dependence and heterogeneity effects
Authors: Islam Md Nizamul , FAYE Ousmane 
Published: January 2023

We investigate the factors underlying poverty transitions in Nairobi’s slums focusing on whether differences in characteristics make people more prone to enter poverty and persist in, or whether past experience of poverty matters on future states. Understanding these issues is essential for the design of effective policy programs aimed at enhancing the lives of the poor. The paper uses an endogenous switching model, which accounts for initial conditions, non-random attrition, and unobserved heterogeneity.Estimations are based on a panel dataset from the Nairobi Demographic Surveillance System. Results indicate that true state dependence (TSD) constitutes the major factor driving poverty persistence. There are little heterogeneity effects. Even when household and individual observed characteristics differ notably, the TSD size remains very large. Active anti-poverty programs aimed at breaking the cycle of poverty constitute then the most appropriate policies for taking people out of poverty and preventing them to fall back in.
Blood Transfusion Practices at The Intensive Observation Unit (Ruang Observasi Intensif/ROI) of Dr. Soetomo General Academic Hospital Surabaya
Authors: Almira Saskia Sabila  , Maulydia  , Betty Agustina Tambunan  , Edward Kusuma  
Published: January 2023

Introduction: Blood transfusion is the process of transferring blood or its components, such as red blood cells, plasma, and platelets, from donor to recipient. The major reason for blood transfusion is anemia and bleeding, frequently seen in critically ill trauma patients in Intensive Observation Unit (Ruang Observasi Intensif/ROI). One of the most prevalent causes of potentially preventable death in trauma patients is uncontrolled bleeding. In addition to controlling the bleeding by surgical or interventional procedures, blood transfusion is carried out to maintain oxygenation to tissue, preventing organ dysfunction due to hypoxia. Objective: This study aimed to determine the profile of blood transfusion carried out on the patients in the ROI of Dr. Soetomo General Academic Hospital. Materials and Methods: This retrospective descriptive study was conducted using medical records involving 258 patients who met the inclusion criteria. Results: The result showed that the majority of patients were female, aged 26-35 years, had blood type O, and Rhesus (Rh)-positive, accounting for 55.04%, 26.36%, 39.53%, and 100%, respectively. The most common indication for transfusion was anemia, with a percentage of 69.10%, particularly severe anemia, accounting for 48.45%. Furthermore, 57.36% of patients were from the surgery department, and 36.05% stayed in ROI for 2-3 days. The most common blood component and unit transfused was packed red blood cells (PRC), with a percentage of 57.50% and 439 units at 47.82%. Most of the transfusions, with a percentage of 37.80%, were carried out within 3-4 hours. Some patients were experiencing pruritus, febrile, urticaria, and chills, accounting for 0.39%, 0.39%, 0.39%, and 0.39%, respectively. Conclusion: Understanding transfusion practices, including blood type distribution, can prevent blood shortage, estimate the need for blood among ROI patients in Dr. Soetomo General Academic Hospital, and further ensure that all transfusions are ABO and Rh compatible.
Crise do direito e propostas de sua superação: ainda há garantias da autonomia jurídica?
Authors: Vital da Rocha Maria , Simões Fontenele Lincoln 
Published: January 2023

Novos modelos de adequação social do direito afetam sua autonomia? Este artigo pretende investigar os mecanismos com os quais o sistema jurídico garante sua positividade e questionar sua subsistência em face de propostas de adequação social do direito na modernidade. Inicialmente, será feita uma exploração, sob a perspectiva teórico-metodológico da Teoria dos Sistemas, para a identificação de mecanismos constitucionais que blindam o sistema funcionalmente diferenciado do direito, que são os direitos fundamentais, a separação de poderes e a eleição política democrática. Após, diante de um quadro de crise de adequação social do sistema jurídico, as propostas do direito responsivo (Nonet e Selznick), do direito procedimental (Habermas) e do direito reflexivo (Teubner) são analisadas. Nesta oportunidade, levam à pergunta se sua implementação não daria suporte à ingerência na operação jurídica por outros sistemas de seu ambiente externo.
An Efficient Model of Simulating Fracture Propagation and Energy Recovery from Naturally Fractured Reservoirs: Effect of Fracture Geometry, Topology and Connectivity
Authors: Cao Meng , Sharma Mukul 
Published: January 2023

Abstract
A combination of hydraulic fracturing and horizontal wells is now being used to tap geothermal energy from naturally fractured reservoirs. Fully grid-based numerical models are currently used to simulate heat recovery from enhanced geothermal systems (EGS). Such models require a fine unstructured mesh and are computationally expensive. In this paper we present a computationally efficient model that allows us to accurately simulate fracture propagation, fluid flow, and heat transfer in networks of natural fractures that may be created in naturally fractured geothermal reservoirs.
The integrated simulator is developed by combining the displacement discontinuity method (DDM) for fracture propagation in naturally fractured reservoirs with a general Green's function solution for fluid and heat flow from the matrix to the fracture. This eliminates the need to discretize the matrix domain resulting in a very computationally efficient solution. A discrete fracture network (DFN) approach is used to represent the pre-existing natural fractures.
The model is first validated against an analytical solution for fluid flow and heat transfer in a rock matrix with a single fracture. The computation time with and without discretizing the rock matrix shows a 100-fold reduction in computation cost with very little loss in accuracy. Parametric studies are conducted to investigate the effect of the distribution of natural fracture density, length, and orientation. The results show that the efficiency of tapping geothermal energy is impacted by geometrical and topological complexities of the fracture network and in particular the connectivity of backbone fractures. It is, therefore, important to optimize (not maximize) the connectivity and complexity of the backbone fracture network. The computationally efficient model presented here provides a practical tool for optimizing operational parameters for efficient geothermal production.
Analysis of Shut-in Pressure Decline for Enhancing our Evaluation of Hydraulic Fracturing Treatments
Authors: Daneshy Ali 
Published: January 2023

Abstract
The focus of this paper is on the analysis of shut-in data immediately after a fracturing treatment and critical information that can be learnt about the created fracture from the magnitude and rate of pressure decline during this period. The selected example data in this paper had two specific features; frac job was injected in two cycles in several stages, and had long shut-in time (more than 10 hrs) in all stages. Review of this data shows that frac growth in each stage continues at a decreasing rate beyond the end of pumping and how many hours of shut-in was needed for the fracture to reach its ultimate stable condition. In this horizontal well with multiple fractures the data also gives direct measure of the relative complexity of the created fractures in each stage and their conductivity.
The paper recommends specific practices that can enhance what can be learnt from the data. These include recording the pressure data continuously during the treatment and for the entire shut-in period, and occasional injection of a small volume of fluid into one or more randomly selected fracture stages to gain better understanding of fracture growth during the stage.
An important conclusion of the paper is that the Instantaneous Shut-In Pressure (ISIP) does not provide a reasonably accurate measure of the least in-situ principal within the fractured formation.