bluuebunny/crossref_metadata_2025_split huggingface dataset:
Comparison of Artificial Neural Network and Fuzzy Logic Approaches for the Prediction of In-Cylinder Pressure in a Spark Ignition Engine
Authors: Solmaz Özgür , Gürbüz Habib , Karacor Mevlüt 
Published: April 2020

Abstract
In first stage, a machine learning (ML) was performed to predict in-cylinder pressure using both fuzzy logic (FL) and artificial neural networks (ANN) depending on the results of experimental studies in a spark ignition (SI) engine. In the ML phase, the experimental in-cylinder pressure data of SI engine was used. SI engine was operated at stoichiometric air–fuel mixture (φ = 1.0) at 1200, 1400, and 1600 rpm engine speeds. Six different ignition timings, ranging from 15 to 45 °CA, were used for each engine speed. Correlations (R2) between data from in-cylinder pressure obtained via FL and ANN models and data form experimental in-cylinder pressure were determined. R2 values over 0.995 were obtained at an ML stage of ANN model for all test conditions of the engine. However, R2 values were remained between range of 0.820–0.949 with the FL model for different engine speeds and ignition timings. In the second stage, in-cylinder pressure prediction was performed by using an ANN model for engine operating conditions where no experimental results were obtained. Furthermore, indicated mean effective pressure (IMEP) values were calculated by predicting in-cylinder pressure data for different engine operation conditions, and then compared with experimental IMEP values. The results show that the in-cylinder pressure and IMEP results estimated with the trained ANN model are fairly close to the experimental results. Moreover, it was found that using the trained ANN model, the ignition timing corresponding to the maximum brake torque (MBT) used in the engine management systems and engine studies could be determined with high accuracy.
Characterization of the Interdependence Between the Light Output and Self-Heating of Gallium Nitride Light-Emitting Diodes
Authors: Chatterjee Bikramjit , Lundh James Spencer , Shoemaker Daniel , Kim Tae Kyoung , Kim Hoyeon , Giebnik Noel C. , Kwak Joon Seop , Cho Jaehee , Choi Sukwon 
Published: April 2020

Abstract
With the advent of gallium nitride (GaN) as an enabling material system for the solid-state lighting industry, high-power and high-brightness light-emitting diodes (LEDs) with wavelengths ranging from near ultraviolet to blue are being manufactured as part of a tremendously large and ever-increasing market. However, device self-heating and the environment temperature significantly deteriorate the LED's optical performance. Hence, it is important to accurately quantify the LED's temperature and correlate its impact on optical performance. In this work, three different characterization methods and thermal simulation were used to measure and calculate the temperature rise of an InGaN/GaN LED, as a result of self-heating. Nanoparticle-assisted Raman thermometry was used to measure the LED mesa surface temperature. A transient Raman thermometry technique was utilized to investigate the transient thermal response of the LED. It was found that under a 300 mW input power condition, self-heating is negligible for an input current pulse width of 1 ms or less. The temperature measured using nanoparticle-assisted Raman thermometry was compared with data obtained by using the forward voltage method (FVM) and infrared (IR) thermal microscopy. The IR and Raman measurement results were in close agreement whereas the data obtained from the widely accepted FVM underestimated the LED temperature by 5–10%. It was also observed that an increase in environment temperature from 25 °C to 100 °C would degrade the LED optical power output by 12%.
New Approach to Stiff-String Torque and Drag Modeling for Well Planning
Authors: Oyedere Mayowa , Gray K. E. 
Published: April 2020

AbstractDuring the process of drilling, the drillstring inadvertently comes in contact with the wellbore generating frictional losses in rotating moment (torque) and axial force (drag). These losses reduce the rotational power available at the drill bit, thus making adequate torque and drag modeling a critical piece in the drilling puzzle. The simplifying assumptions of the widely used soft-string model for torque and drag modeling make it less accurate for new complex well designs, therefore creating the need for the use of the more robust stiff-string model. This work focuses on a new approach for developing a stiff-string model that can be easily implemented for well planning. The stiff-string model addresses the pitfalls of the soft-string model by using cubic splines for its well-path trajectory and solving three coupled, non-linear ordinary differential equations that describe the motion of the drillstring at each survey point to account for the shear forces and bending stiffness. The stiff-string model is then applied to design 4 horizontal wells. In comparison with the soft-string model, results show that the stiff-string model is able to capture the extra contact loads as the drillstring goes through bends, consequently predicting higher hookload and torque values than the soft-string model. This paper also highlights how both models can be applied to well planning for improved results.
Effect of Heating Rate on Chemical Kinetics of Chicken Manure With Different Gas Agents
Authors: Selim Osama M. , Hussein Mohamed S. , Amano Ryoichi S. 
Published: April 2020

Abstract
This paper presents the study on the effect of different heating rates on the pyrolysis and gasification process of the chicken manure. The obtained results are shown by the extent of reaction, the kinetics of the reaction, and differential thermal analysis. In total, 24 cases were carried out; eight heating rates with three different gas agents each. The results show that when using nitrogen or carbon dioxide as gas agents, the reactions were endothermic. Consequently, the energy must be supplied in terms of heating to sustain the reaction. Furthermore, the air gasification was exothermic, which means that the reaction can be sustained without external heating, where the self-ignition was observed between 450 °C–600 °C. The thermal degradation of the three main components of the chicken manure was obtained. The pyrolysis process was divided into two regions at 360 °C and the order of reaction of five for both regions. For the gasification process, it was observed that carbon dioxide had the most complicated mechanism with four stages. Finally, it is recommended to use the lowest heating rate to allow a quasi-equilibrium state through slow heating. Consequently, the delay in response or any transient error can be avoided as they are the main reason for measurement errors. These chemical kinetic parameters can be used in the future for the chicken manure simulation using the order of reaction mechanism for solid-state gasification.
Particulate Morphology Characterization of Butanol–Gasoline Blend Fueled Spark-Ignition Direct Injection Engine
Authors: Sharma Nikhil , Agarwal Avinash Kumar 
Published: April 2020

Abstract
Butanol is an oxygenated renewable fuel and therefore is a potential candidate to be blended with gasoline to reduce particulate emissions. In this experimental investigation, particle number-size (PN-size) distribution and morphology (physical characterization) of soot emitted by the butanol–gasoline blend in a gasoline direct injection (GDI) engine have been investigated. The effect of engine load and fuel injection pressure (FIP) on particulates was investigated for two test fuels: gasoline and Bu15 (85%, v/v, gasoline blended with 15%, v/v, butanol) in a 0.5 L single-cylinder GDI engine using an engine exhaust particulate sizer (EEPS) and a partial flow dilution tunnel for collecting particulate samples on a filter paper. The physical characterization of particulates included primary particle size (Dp) and particle agglomerate characterization parameters such as agglomerate length (L), agglomerate width (W), skeletal length (Lsk) and skeletal width (Wsk), which were determined using a transmission electron microscope (TEM) and corresponding image analyses. PN-size distribution was relatively lower for Bu15, which decreased with increasing FIP. Regardless of the GDI engine operating condition, classical sphere and chain-like agglomerates having nearly similar nano-scale morphology were detected. The primary particle diameter changed with varying engine operating conditions. A comparative analysis of soot originating from Bu15 and gasoline was presented, which may be useful for gasoline particulate filter (GPF) design and to understand the regeneration of GPFs in practical engine applications.
Performance of S1210 Profile Used in Current Turbine Blades With Tubes Inserted at a Regular Interval
Authors: Kundu Parikshit , Sarkar Arunjyoti , Nagarajan Vishwanath 
Published: April 2020

AbstractThe annual power output of a current turbine is affected by flow separation followed by the stall condition in an environment of varying current speed. Flow separation appears as the fluid in the boundary layer over the blade surface loses its kinetic energy. Delaying this separation process is essential to extract more power throughout the year considering the variation in the current speed. Several active and passive means are available in the literature today to achieve a delay in the flow separation process. Inserting tubes in an aero/hydrofoil at a constant spacing, connecting the fluid near the leading edge and a downstream location on the suction side is a novel approach that has been numerically investigated here. The baseline profile chosen here is S1210, which is used in the current turbine blades. The hydrodynamic performance of the profile with tubes has been compared with the baseline profile in terms of the force coefficients, lift to drag ratio, and stall angle. The maximum lift has been noticed to be increased by 18% and the stall is delayed by 2 deg (from 10 deg to 12 deg). The maximum lift to drag ratio is increased by 130% at 12 deg (beyond the stall of the baseline profile). The results show that the insertion of tubes can make the existing profile more efficient for the stated application.
Techno-Economic Analysis of Micro-Grid Based Photovoltaic/Diesel Generator Hybrid Power System for Rural Electrification in Kerkennah, Tunisia
Authors: Dardour Houda , Chouaieb Olfa , Sammouda Habib 
Published: April 2020

Abstract
This paper scrutinizes the techno-economic feasibility of a solar hybrid off-grid power system, in a rural area in Tunisia. Hybrid Optimization of Multiple Energy Resources (homer) is used for the design and the optimization of a hybrid photovoltaic (PV)/diesel power system consisting of photovoltaic panels, a diesel generator, a converter, and a battery bank. A sensitivity analysis is carried out to investigate the impact of the key system parameters such as the average load, the diesel fuel price, and the reliability constraints on the system outputs and performance. Sensitivity analysis is also used to compare different system configurations and to identify thresholds and situations in which one configuration is more cost-effective than another. Three system types are considered: PV/battery, PV/diesel/battery, and diesel/battery. The results showed that beyond a certain load threshold, the hybrid system is the most cost-effective and that micro-grid projects based on hybrid PV/Diesel power systems can be a solution for rural electrification in Tunisia where there is no possibilities for the national electric grid extension.
Altitude and Heat Training in Preparation for Competitions in the Heat: A Case Study
Authors: Carr Amelia J. , Saunders Philo U. , Garvican-Lewis Laura A. , Vallance Brent S. 
Published: April 2020

Purpose: To quantify, for an elite-level racewalker, altitude training, heat acclimation and acclimatization, physiological data, and race performance from January 2007 to August 2008. Methods: The participant performed 7 blocks of altitude training: 2 “live high:train high” blocks at 1380 m (total = 22 d) and 5 simulated “live high:train low” blocks at 3000 m/600 m (total = 98 d). Prior to the 2007 World Championships and the 2008 Olympic Games, 2 heat-acclimation blocks of ~6 weeks were performed (1 session/week), with ∼2 weeks of heat acclimatization completed immediately prior to each 20-km event. Results: During the observation period, physiological testing included maximal oxygen uptake (VO2max, mL·kg−1·min−1), walking speed (km·h−1) at 4 mmol·L−1 blood lactate concentration [La−], body mass (kg), and hemoglobin mass (g), and 12 × 20-km races and 2 × 50-km races were performed. The highest VO2max was 67.0 mL·kg−1·min−1 (August 2007), which improved 3.1% from the first measurement (64.9 mL·kg−1·min−1, June 2007). The highest percentage change in any physiological variable was 7.1%, for 4 mmol·L−1 [La−] walking speed, improving from 14.1 (June 2007) to 15.1 km·h−1 (August 2007). Personal-best times for 20 km improved from (hh:mm:ss) 1:21:36 to 1:19:41 (2.4%) and from 3:55:08 to 3:39:27 (7.1%) in the 50-km event. The participant won Olympic bronze and silver medals in the 20- and 50-km, respectively. Conclusions: Elite racewalkers who regularly perform altitude training may benefit from periodized heat acclimation and acclimatization prior to major international competitions in the heat.
The Effects of Therapeutic Exercise With and Without Mobilization in Participants With Chronic Ankle Instability: A Randomized Controlled Trial
Authors: Bolton Cameron , Hale Sheri , Telemeco Todd 
Published: April 2020

Context: Manual therapy (MT) is reported to increase range of motion (ROM), improve balance, and decrease pain in individuals with chronic ankle instability (CAI). Additional literature is needed to examine the effectiveness of the addition of MT to a therapeutic exercise regimen in individuals with CAI. Objective: To examine the combined effects of thrust joint manipulation (TJM) and exercise on function in participants reporting CAI. Design: Randomized controlled trial. Setting: Research laboratory. Participants: A convenience sample of 30 participants (mean age 23.7 [3.65] y; mean height 169.50 [9.50] cm; mean mass 66.48 [10.64] kg). Intervention: Participants were randomly allocated to the exercise (n = 15) or exercise + TJM group (n = 20) and completed an exercise program. The exercise + TJM group also received MT at the talocrural, proximal, and distal tibiofibular joints in the first 3 sessions. Main Outcome Measures: Self-reported outcomes were recorded at baseline and follow-up using the Foot and Ankle Ability Measure (FAAM), the FAAM-Sport (FAAM-S) subscale, and the Ankle Joint Functional Assessment Tool (AJFAT). The side-hop test, figure-of-8 hop test, 3 directions of the Star Excursion Balance Test, and dorsiflexion ROM were also assessed at baseline and follow-up. Results: Only the exercise + TJM group demonstrated an improvement in weight-bearing dorsiflexion with the knee flexed following treatment (P = .02). For all outcome measures, except ROM, subjects improved significantly at follow-up regardless of group assignment (P ≤ .01). Conclusions: Our data suggest that rehabilitation of patients with CAI is related to improved ROM, function, and self-reported outcomes. This provides evidence that the addition of MT to exercise may enhance improvements in ROM as compared with exercise alone. Additional research is needed to identify optimal parameters to maximize therapeutic benefit.
Early sulfide saturation is not detrimental to porphyry Cu-Au formation
Authors: Du Jingguo , Audétat Andreas 
Published: April 2020

AbstractOre-forming magmas are commonly considered to have been unusually metal rich. Because Cu and Au are strongly chalcophile, early sulfide saturation has been regarded as detrimental to porphyry Cu-Au mineralization. Here we demonstrate, based on amphibole-rich cumulate xenoliths and amphibole megacrysts from the Tongling porphyry(-skarn) Cu-Au mining district in southeastern China, that this view is not necessarily correct. Age data combined with petrological and geochemical evidence suggest that the mineralizing magmas at Tongling underwent significant fractional crystallization of amphibole, clinopyroxene, and magmatic sulfides in the middle to lower crust. The fact that the silicate melts nevertheless were able to produce substantial porphyry(-skarn) Cu-Au deposits implies that the formation of metal-rich cumulates at depth was not detrimental to their fertility. On the contrary, the common association of porphyry Cu (Au, Mo) deposits with high-Sr/Y magmas suggests that amphibole fractionation at depth even promotes the mineralization potential, despite the likely loss of metals.
Prognostic factors for relapse and survival among patients with ocular adnexal lymphoma: validation of the eighth edition of the American Joint Committee on Cancer (AJCC) TNM classification
Authors: Kwon Miyoung , Lee Ji Sung , Lee Chunghyun , Yoon Dok Hyun , Sa Ho-Seok 
Published: April 2020

Background/AimsTo validate the prognostic performance of the American Joint Committee on Cancer (AJCC) eighth edition classification for ocular adnexal lymphoma (OAL).MethodsWe performed a retrospective review of 140 consecutive patients treated for primary OAL between March 2010 and September 2017. Associations between T/N/M categories at presentation and disease-related outcomes, including relapse, progression-free survival (PFS) and overall survival (OS) were evaluated.ResultsSeventy-nine women and 61 men (median age, 52 (range 20–84) years; median follow-up, 57 (range 7–131) months) were included. Histological subtypes included mucosa-associated lymphoid tissue lymphoma (92.1%, n=129), diffuse large B-cell lymphoma (5.0%, n=7), follicular lymphoma (1.4%, n=2) and mantle cell lymphoma (1.4%, n=2). Patients with ≥T2 disease had significantly higher risks of overall relapse (unadjusted HR)=4.32, p=0.016), decreased PFS (uHR=5.19, p=0.004) and decreased OS (uHR=9.21, p=0.047). Patients with ≥N1 disease had significantly higher risks of overall relapse (uHR=9.17, p<0.001) and decreased PFS (uHR=9.24, p<0.001). M1 disease was significantly associated with higher risks of overall relapse (uHR=3.62, p=0.036), decreased PFS (uHR=5.13, p=0.001) and decreased OS (uHR=9.24, p=0.013). On considering TNM categories as continuous data, the uHRs for per level increase in T, N and M categories were 1.77, 1.83 and 2.30 for overall relapse and 1.72, 1.87 and 2.78 for decreased PFS, respectively (p<0.05 for each comparison).ConclusionThe T, N and M categories of the AJCC eighth edition classification have prognostic value for relapse and survival among patients with primary OAL. Particularly, nodal/metastatic involvement at presentation indicated less favourable outcome.
Delivering trauma and rehabilitation interventions to women and children in conflict settings: a systematic review
Authors: Jain Reena P , Meteke Sarah , Gaffey Michelle F , Kamali Mahdis , Munyuzangabo Mariella , Als Daina , Shah Shailja , Siddiqui Fahad J , Radhakrishnan Amruta , Ataullahjan Anushka , Bhutta Zulfiqar A 
Published: April 2020

BackgroundIn recent years, more than 120 million people each year have needed urgent humanitarian assistance and protection. Armed conflict has profoundly negative consequences in communities. Destruction of civilian infrastructure impacts access to basic health services and complicates widespread emergency responses. The number of conflicts occurring is increasing, lasting longer and affecting more people today than a decade ago. The number of children living in conflict zones has been steadily increasing since the year 2000, increasing the need for health services and resources. This review systematically synthesised the indexed and grey literature reporting on the delivery of trauma and rehabilitation interventions for conflict-affected populations.MethodsA systematic search of literature published from 1 January 1990 to 31 March 2018 was conducted across several databases. Eligible publications reported on women and children in low and middle-income countries. Included publications provided information on the delivery of interventions for trauma, sustained injuries or rehabilitation in conflict-affected populations.ResultsA total of 81 publications met the inclusion criteria, and were included in our review. Nearly all of the included publications were observational in nature, employing retrospective chart reviews of surgical procedures delivered in a hospital setting to conflict-affected individuals. The majority of publications reported injuries due to explosive devices and remnants of war. Injuries requiring orthopaedic/reconstructive surgeries were the most commonly reported interventions. Barriers to health services centred on the distance and availability from the site of injury to health facilities.ConclusionsTraumatic injuries require an array of medical and surgical interventions, and their effective treatment largely depends on prompt and timely management and referral, with appropriate rehabilitation services and post-treatment follow-up. Further work to evaluate intervention delivery in this domain is needed, particularly among children given their specialised needs, and in different population displacement contexts.PROSPERO registration numberCRD42019125221.
Perceptions of the feedback process: a case study of veterinary residents and supervisors
Authors: Perry Karen Lisette , Frendo Londgren Molly , Vinten Claire 
Published: April 2020

BackgroundAppraisal of resident clinical performance is critical during training. The most common method for this is feedback to residents based on impressions of supervising clinicians. How effective these practices are for veterinary residents remains unknown. This study focused on establishing perceptions of veterinary residents and supervisors regarding the feedback process.MethodsA qualitative case study format was chosen to investigate the perceptions and experiences within a well‐developed residency programme. The study cohort consisted of veterinary residents and supervisors from the same specialties. Qualitative data were collected through individual semistructured interviews continuing iteratively until theoretical saturation was reached (14 in total).ResultsMismatches in resident and supervisor perceptions were evident regarding positive feedback delivery and the importance of dialogue. The nature of the resident/supervisor relationship and the efficacy of feedback were closely interlinked. The development of a feedback‐friendly culture would be beneficial. Residents perceived that feedback on teaching was lacking. Milestones were perceived to be lacking.ConclusionThe results highlight a need for change away from the ‘no news is good news’ culture. Development of training workshops, formation of closer relationships between supervisors and residents, and a transition to competency‐based education may be necessary.