bluuebunny/crossref_metadata_2025_split huggingface dataset:
Optimization of Mud Cap Design for Tripping Operations and its Application in Challenging HPHT MPD Wells: Case Histories from Pakistan
Authors: Muhammad Shoaib , Ashraf Qasim , Baig Umair Ahmed 
Published: March 2022

Abstract
Growing reliance and new technologies have significantly optimized the drilling operations; un-drillable wells become drillable now. We strive to increase drilling efficiency, whether managed pressure drilling (MPD) or conventional drilling operations. Designing an MPD operation inherits multiple challenges and requires the evaluation of numerous parameters. These include bottom hole pressure management, tripping, cementing, logging & completion operations. However, this paper only describes how the tripping processes can be optimized using effective mud cap design in very narrow window HP/HT MPD wells.
Constant bottom hole MPD (CBH-MPD) is one of the extensively used variants of MPD around the globe. In CBH-MPD, Surface backpressure is the differentiating factor added to keep the bottom hole pressure (BHP) constant in static and dynamic conditions. A close-loop is necessary to attain this control on the annulus pressure with specialized equipment, including effective sealing around the drill string and choking the return flow. The sealing is only effective against the smooth surfaces; hence, one of the most significant challenges in MPD operations arises: having a constant BHP in case of pull out to the surface. If the downhole isolation valve (DIV) is deployed, the well can be shut on it. However, if a DIV is not available, the well can be balanced by designing an effective mud cap keeping the available trip margins.
Planning and executing a mud cap for MPD is challenging and can be overlooked in the planning phase. Designing a mud cap is complicated as many factors need to be incorporated. This paper describes, in detail, how these challenges were identified, planned for, and overcome. Multiple parameters were analyzed in sequences for subjected wells to optimize the mud cap weight and spotting depths. These parameters include the available tripping window, bottom hole temperature, circulation pressures, mud additives, mud rheology, surge, and swab pressures. Residing time of the mud cap in the hole is also a key factor considered in the design as it may also disturb the CBH pressure. Other design considerations included rig compatibility and volume handling capacity, equipment limitations downhole and surface, availability of chemicals, and effective rollover plan. The effective mud cap design for these narrow HP/HT wells mentioned in these case studies was an arduous and challenging task.
This paper also discusses the aforementioned mud cap design considerations and their effects on selecting an appropriate mud cap. Practical examples are shared from challenging case studies, elaborating the detailed design and execution aspects.
Resolution of Non-Repeatable Synchronous Rotor Response of a Power Generator
Authors: Mr. Mohammed Ashour , Mr. Mustafa Shalabi 
Published: March 2022

Abstract
This is a machine train consists of gas turbine driving an air-cooled synchronous generator (3600 rpm and 80 MW rated power), which showed increasing vibration levels on the generator bearings after each shutdown/startup event starting October 2020.
A multichannel analyzer was hooked to collect the data during cold startup. Generator bearings showed high casing vibration levels close to alarm setpoints. The review of data during the transient modes (startup/shutdown) and at steady state indicated a clear symptom of couple-unbalance of the generator rotor without significant effect on the turbine bearings.
Onsite balancing activity showed non-linear synchronous rotor response (different influence coefficient between the trial and correction runs), also a repeatability test (two similar runs without changing the balancing weights) on the generator rotor showed non repeatable synchronous response.
Based on the above observations it was recommended to perform a borescope on the generator rotor. The investigation revealed that the root cause of the non-repeatable behavior was the sand ingress from the makeup generator air breather due to lack of proper maintenance. Dry cleaning of the rotor carried out and sand was removed by vacuum, then filters/gaskets replaced with new and healthy ones. Later, machine started with very acceptable vibration levels well below alarm setpoints.
This case study will outline how to identify the nonlinear synchronous rotor response based on the balancing influence vector calculations using the transient polar plots data.
Parental Perspectives of Work-Family Conflict and Guilt in Collegiate Athletic Trainers: A Descriptive Qualitative Design
Authors: Singe Stephanie M. , Rynkiewicz Kelsey M. , Eason Christianne M. 
Published: March 2022

Context
Work-family guilt has been reported among athletic trainers (ATs) working in the intercollegiate setting; however, it has yet to be fully explored from a descriptive, in-depth perspective.

Objective
To better understand the experiences of work-family conflict and guilt of intercollegiate ATs who are parents.

Design
Descriptive qualitative study.

Setting
Intercollegiate athletics.

Patients or Other Participants
Twelve collegiate ATs (females = 6, males = 6) participated in the study. All 12 were married (12 ± 7 years) with an average 2 ± 1 children (range = 1–4). The ATs reported working 51 ± 9 hours per week and spending 11 ± 7 hours per week on household duties or chores.

Data Collection and Analysis
One-on-one interviews were conducted with all participants. An inductive descriptive coding process was used to analyze the data after saturation was met. Peer review and researcher triangulation were completed.

Results
Conflict and guilt were discussed as unavoidable given the equally demanding roles of AT and parent. The resulting guilt was bidirectional, as each role is equally important to the AT. The management theme was specifically defined by 3 subthemes: creating a separation between work and parenting roles, the benefits of having a supportive workplace, and the importance of having coworkers and supervisors with shared life experiences.

Conclusions
The ATs experienced work-family conflict and feelings of guilt from their parental responsibilities. The guilt described by the ATs was bidirectional, as they placed high value on both their parenting and athletic training roles. Guilt was balanced and managed by reducing the spillover from the parental role into work or work into time at home. By separating roles and having supportive workplace environments, including coworkers and supervisors who had similar life experiences, ATs felt they were better able to meet work and home demands.
Safety and Efficacy of USG-Guided Catheter Drainage in Liver Abscesses
Authors: Das Swati , Shankar Girendra , Mohapatra Vedavyas 
Published: March 2022

Background:
This study aimed to evaluate the safety and efficacy of USG-guided percutaneous drainage in liver abscesses of >5 cm. A lot of literature is available on the minimally invasive treatment of liver abscesses since its introduction in the early 1980s. This study focuses on the eastern Indian population and the outcome of treatment of liver abscess of >5 cm by means of catheter drainage and the use of antibiotics.

Patients and Methods:
This is a retrospective study conducted on a total of fifty patients over a period of 1 year, 1 month (from June 2017 to June 2018). Only patients with liver abscess with size >5 cm were included in the study. The demographic characteristics; comorbidities; and clinical, radiological, and bacteriological characteristics of liver abscesses in the eastern Indian population and the safety and efficacy of catheter drainage were evaluated.

Results:
It was found that because of preprocedural empirical antibiotic intake, 70% of the patients had no growth in the pus, whereas 12% had Entamoeba histolytica, 8% had Escherichia coli, and 6% had Klebsiella pneumoniae as the causative agent. The total duration of hospital stay ranged from 3 to 22 days, and the duration of intravenous antibiotics ranged from 1 to 9 days with a clinical success rate of 96% without any drainage-related complications.

Conclusion:
In contradiction to the earlier belief, percutaneous drainage is a safe and effective means of treatment in liver abscesses of >5 cm with high clinical success rate and reduced duration of intravenous antibiotic requirement as well as hospital stay.
Paraquat – Boon or Bane? A Retrospective Study of Paraquat Poisoning and Outcomes in a Tertiary Care Center in South India
Authors: Ramamoorthi Kusugodlu , Acharya Vasudeva , Lewis Melissa Glenda 
Published: March 2022

ABSTRACT

Setting:
Paraquat is a highly toxic, herbicide, extensively used in various parts of India. There is no effective treatment for paraquat poison and carries a very high mortality. In India, this compound can be misused for harmful purposes.

Objective:
A retrospective time-bound descriptive study of paraquat-consumed patients was conducted at Kasturba Hospital, Manipal, from January 1, 2014 to January 31, 2016.

Materials and Methods:
All the data were analyzed using the SPSS version 16. All the categorical data are expressed in terms of frequency and percentage. Continuous normal variables were expressed in terms of mean ± standard deviation, and skewed variables were expressed in terms of median and quartiles. Chi-square test was used to find the association between the categorical independent variables across the outcome in survivors, nonsurvivors, and those patients who were discharged from the hospital against medical advice. Similarly, Fisher’s exact test was performed for those variables, for which 20% of the expected cell count was <5%. Kruskal–Wallis test was used to compare the relationship between the continuous skewed variables across the outcome.

Results:
A total of 55 paraquat-consumed patients were admitted, out of which 67.27% (n = 37) of patients were men. Only 32.7% (n = 18) of patients were farmers. Oral ulcers were seen in 43.6% (n = 24) of patients. About 65.5% (n = 36) of patients underwent hemoperfusion, 27.3% (n = 15) of patients survived, 47.3% (n = 26) of patients expired, and 25.5% (n = 14) of patients were discharged against medical advice in a critical condition. The presence of respiratory failure, hypotension, need for ventilator supportive therapy, the elevation of levels of blood urea, serum creatinine, and liver enzymes AST and ALT levels were statistically significant in three groups (P < 0.001).

Conclusion:
Paraquat poisoning is highly fatal. Treatment is expensive and available only in tertiary care hospitals in India. Central and state governments should ensure that it should not be readily accessible to ordinary people and it should be banned progressively.
Face Recognition Enabled Door Access Control System
Authors: Adetoyi Oluyemi E. , Awe Boluwatife P. 
Published: March 2022

Face recognition has found usage in many applications from the simplest systems to the more complex systems. The years of researches in this field has witness improvements in detection accuracy. However, few studies that incorporate face recognition for access control are suitable for restricted areas. This work aims at using face recognition for access control systems using Haar cascade feature descriptor and LBPH as classifier algorithm. The system was implemented on raspberry pi 3- model B board, which consists of a solenoid lock that is activated to grant access to the user when a matching face is detected by the classifier algorithm. In the event when there is no match between the detected face and the database facial images, a red light comes on and the doorbell rang. The accuracy, sensitivity, specificity, and precision of the LBPH algorithm are respectively 96%, 97.5%, 90.5%, and 97.5%. The delay in the processing of signals to activate the door lock and doorbell is not more than 4 seconds. Thus, the system is effective as a real-time access control mechanism. Keywords— Access control, Computer vision, Facial recognition, LBPH, OpenCV.
The Characteristics of Pervious Concrete with Gravel as Coarse Aggregate
Authors: Dahunsi Bamidele I.O. , Osasona Toyin D. , Adeniyi Philip O. 
Published: March 2022

Pervious concrete is a low-cost and effective drainage technique for metropolitan areas that reduces storm water flow. The goal of this research is to examine the properties of gravel as a coarse aggregate material in pervious concrete. The geotechnical properties of the gravel were investigated to determine their suitability in the construction of pervious drainage structures. The samples collected were subjected to particle size distribution test, aggregate crushing value test, and aggregate impact value test. The concrete samples were then put through a series of tests, including a slump test, a compressive strength test, a density test, and a permeability test. In accordance with the particle size distribution result, the gravel is properly graded. The slump test affirms that as the aggregate size of the pervious concrete reduces, the workability improves. Coarse aggregate of 13.2mm size, had highest compressive strength (4.889KN/) at 28days while those of 19.00mm, 25.00mm, and 37.50mm had compressive strength of 4.520KN/,4.146KN/ and 4.074KN/ respectively. The 37.50mm aggregate size had a higher permeability value compared to that of the 13.20mm aggregate size pervious concrete. The compressive strength increased from 3 to 28 days, for the four aggregate sizes. It was detected that the 37.50mm aggregate size produced pervious concrete with a higher co-efficient of permeability of 8.652 X 10-4 cm/sec for aggregate sizes of 13.20mm, 19.00mm, and 25.00mm were 6.845 X 10-4 m/s, 5.768 X 10-4 m/s, and 3.993 X 10-4 m/s respectively. From the analysis of result derived, it is deduced that the use of granite for pervious concrete is stronger than gravel. Gravel can excellently be used in areas that are not subjected to repeated heavy loads.Keywords: Pervious Concrete, Granite, Gravel, Permeability, Compressive Strength
Optimal PID Controller Tuning for DC Motor Speed Control Using Smell Agent Optimization Algorithm
Authors: Abba Aminu M. , Karataev Tologun , Thomas Sadiq , Ali Abdulhakeem M. , Yau Isiyaku , Mikail Shamsudeen A. 
Published: March 2022

This paper presents an optimal PID controller for speed control of DC motor using Smell Agent Optimization (SAO) Algorithm. DC Motor is an energy converter which transforms electrical energy into mechanical energy used in several industrial applications. A SAO based PID is proposed for optimal tuning of the parameters of the controller to improve speed control of the motor. The SAO uses the phenomenon of smell perception and the intuitive trailing behavior of an agent to identify the source of smell. The integral of time multiplied absolute error (ITAE) is taken as the objective function for obtaining the parameters of the PID controller. It has been observed SAO-PID controller outperforms the GA based PID controller with less settling time, rise time and overshoot. Keywords— DC motor, PID controller, rising time, settling time, smell agent optimization algorithm
Power Minimization in Dual-Hop Underlay Cooperative Cognitive Radio Relay Networks for Optimal Resource Allocation
Authors: Obayiuwana Enoruwa , Ayodele Periola , Fisusi Abimbola 
Published: March 2022

In this paper, we investigate a multi-user one-way dual-hop multi-relay cognitive radio underlay spectrum sharing network. .The joint optimal resource allocation of the bandwidth and power allocation in underlay Cooperative Cognitive Radio Relay Network (CCRRN) was studied and a convex optimization analytical framework is presented. A combined optimal power and bandwidth allocation (COPBA) scheme for the minimization of the total network power and blocking probability of the call admission control stage of the CCRRN is investigated. Our goal is to jointly optimize the bandwidth and power allocation such that the total transmission power in the CCRRN is minimized without compromising the Quality of Service (QoS) demands of the secondary users (SUs) and the interference constraint thresholds of the primary users (PUs) in the primary networks. The mathematical model and convex optimization problem with the aim of minimizing the total transmission power of the CCRRN was formulated. The resulting optimization problem was solved in the standard computer based numerical optimization solver package CONOPT in MATLAB/TOMLAB environment. Simulation results obtained is compared the equal-bandwidth optimal power allocation scheme. Keywords—Radio resource allocations; Cognitive radio Networks; Convex optimization; Cooperative relay networks, Transmit power minimization
Determination of Design-Related Physical and Mechanical Properties of Palm Nut
Authors: Ugama Godwin N. , Garuba Halimat S. , Musa Jamiu , Sada Abba M. , Kalu Godwin 
Published: March 2022

The knowledge of the physical dimensions and mechanical strength of agro-material/bio-materials is needed in the design and development of agricultural processing and handling machines. The physical properties were determined with help of oven dryer, vernier caliper and electronic weighing sale while the mechanical properties were determined with the help of 1000 KN Universal Materials Testing Machine (Enerpac), Cat.Nr.261, with reading accuracy of 0.01 KN. The physical properties of palm nuts determined in this study were geometric mean diameter, sphericity, projected area, surface area, arithmetic mean diameter, square mean diameter, flakiness ratio, and elongation ratio. These measurements were investigated at moisture content dry basis (17.42%) The mean value of geometric mean diameter is 18.84 mm, sphericity (0.758), projected area (366.7 ), square mean diameter (19.19 mm), arithmetic mean diameter (19.48 mm), flakiness ratio (0.81), elongation ratio (1.36) and volume (3808.5 ). The average crushing force for ten samples of palm nuts under vertical loading conditions is higher than the average crushing for ten samples of palm nuts under horizontal loading conditions. The average crushing force and compressive strength under vertical loading were 1765 N and 3.79 N/and the average crushing force and the compressive strength under horizontal loading was found to be 1428 N and 2.71 N/. The values of mechanical and physical properties will guide a palm nut cracker designer is selecting the appropriate speed of a beater, fan’s speed, hopper’s inclination, screening sizes. The overall objective of this study is to present adequate data that will enable machine developers to develop efficient palm nut/palm fruits processing machines.Keywords: crushing, compressive strength, mechanical, materials, speed.
SISTEM INFORMASI MANAJEMEN ASSET BERBASIS WEB ( STUDI KASUS : PT. KRAKATAU IT CILEGON )
Authors: Amrullah Roy , Megayanti Anita , Yusta Afrasim 
Published: March 2022

Asset management is an asset management in a certain period of time that provides assurance about the value of an asset in currency units and also regulates the minimum amount of expenditure. Because the asset itself contains value and means to the agency, it must be properly managed. PT. Krakatau IT has several divisions, one of which is the Infrastructure division where there are several parts, one of which is the EUD (End User Device) unit which is in charge of maintaining, installing, repairing and changing assets.
Activities carried out by the EUD unit of PT. In managing these assets, Krakatau IT still uses conventional methods, namely the process of first making the asset handover form and stored in a filing cabinet so that asset data can be lost or damaged.
Asset data processing with conventional methods can make it difficult to produce reports so that the process of searching and recapitulating data takes a long time which results in ineffective and efficient presentation of a report.
On this occasion the authors propose to make an information system design application to manage assets in order to be able to present information more effectively and efficiently.
RANCANG BANGUN LAMPU OTOMATIS MENGGUNAKAN SENSOR CAHAYA BERBASIS ARDUINO DI POLRES PEMATANGSIANTAR
Authors: Rizki Dimas Bayu , Sumarno Sumarno , Lubis Muhammad Ridwan , Andani Sundari Retno , Sari Ika Purnama 
Published: March 2022

A Lights are one of the basic needs in everyday life, both in household life, offices, and others, especially at the Pematangsiantar Police Station. In line with the rapid development in the field of technology, the amount of electricity demand tends to increase rapidly. This increase in demand can be caused by the increasing number of people using electrical technology. However, there needs to be a wise attitude in the use of this lighting energy source. If the lamp is left on, it will waste electricity. This often happens because you forget to turn it off. But if it is turned off then at night it will be dark until someone turns on the light. Therefore, automation is needed in regulating the use of electrical energy in lamps. In this case, an automatic lamp design was made using an Arduino-based light sensor that can be set to turn on and off automatically according to the intensity of sunlight received so that it will suit the needs of the lamp. This automatic lamp is equipped with Arduino, LDR module, and relay. The lighting load is usually operated manually by humans, with this study, human intervention in operations can be reduced. The results of this study showed that the Arduino-based light sensor can be implemented in the design of automatic lights.

Keyword: Design, Automatic Lights, Light Sensors, Arduino, Polres Pematangsiantar
Des Œuvres complètes de Dürrenmatt en français ?
Authors: Bühler Pierre 
Published: March 2022

Le volume que les éditions Albin Michel viennent de publier (2021) sous le titre : Friedrich Dürrenmatt, Œuvres complètes. Tome 1, pose problème. Il est peu probable que le projet de l’éditeur soit de proposer une traduction française des trente-sept volumes de l’édition allemande. Par ailleurs, la traduction déjà ancienne (des années 1950 et 1960) des quatre romans de ce volume s’avère difficile et trahit souvent, sous divers angles, les textes originaux de l’auteur alémanique.
Faktor-Faktor yang Mempengaruhi Kinerja Pegawai Tata Usaha Di SMA Muhammadiyah Kendari
Authors: Aziz Pagala Abdul , Asrul Asrul , Arfin Arfin 
Published: March 2022

Tujuan dalam penelitian ini adalah mendeskripsikan dan menganalisis faktor-faktor yang mempengaruhi kinerja pegawai tata usaha di SMA Muhammadiyah Kendari. Jenis penelitian ini adalah penelitian deskriptif kualitatif .Subjek dalam penelitian ini adalah kepalah sekolah dan 4 orang pegawai tata usaha. Sumber data dalam penelitian adalah data primer dan data sekunder. Teknik pengumpulan data yang digunakan dalam penelitian yaitu observasi, wawancara, dan dokumentasi. Teknik analisis data yang digunakan dalam penelitian yaitu pengumpulan data, reduksi data, penyajian data dan penarikan kesimpulan. Hasil penelitian menunjukkan bahwa terdapat beberapa faktor yang mempengaruhi kinerja pegawai tata usaha di SMA Muhammadiyah Kendari yaitu: (1) faktor internal yang meliputi faktor kemampuan yaitu kecerdasan pegawai secara maksimal dalam mengelolah data-data sekolah, sedangkan faktor motivasi yaitu meliputi pemberian kompensasi berupa insentif yang merupakan salah satu bentuk penghargaan sekolah terhadap prestasi kerjanya, dan keamanan kerja yaitu jaminan-jaminan yang memberikan rasa aman dan tentram dalam bekerja misalnya jaminan hari tua (pensiunan), jaminan asuransi kesehatan (askes). (2) faktor eksternal yang meliputi suasana kerja yaitu keadaan yang kondusif sangat berpengaruh dalam melaksanakan tugas atau pekerjaan, terjalinya hubungan rekan yang baik antara pegawai tata usaha dengan guru dan kepalah sekolah, tersedianya fasilitas kerja seperti alat-alat perlengkapan dalam berkerja.