bluuebunny/crossref_metadata_2025_split huggingface dataset:
Effect of Discharge Energy Distribution on Flame Kernel Development
Authors: Zhu Hua , Yu Xiao , Wang Linyan , Zheng Ming , Li Liguang , Liu Mengzhu 
Published: December 2020

Abstract
The early flame kernel initiation and development are essential to a successful combustion process, especially under lean burn/EGR diluted conditions. Multiple ignition sites strategy has shown promise to secure the flame kernel initiation under extreme engine operating conditions. Two factors are considered to contribute to the enhanced ignition capability, i.e. the higher ignition energy and the multiple initial flame kernels. However, the mechanism why the multiple ignition sites help combustion is less understood. In this work, the impacts of the ignition energy distribution strategy on the flame inception process are investigated in a constant volume combustion chamber. A multi-coil ignition system, along with a sparkplug with three high-voltage electrodes, is used to adjust the discharge energy from 10 mJ to 240 mJ, as well as the energy deposition strategies. Experimental results have shown that the distributed energy strategy with sufficient discharge energy can establish a bigger initial flame kernel, leading to faster flame growth rates, as compared to the concentrated energy strategy.
Study on Automatic Adaptation for a Control-Oriented Model of an Advanced Diesel Engine
Authors: Nishii S. , Yamasaki Y. 
Published: December 2020

Abstract
Although many studies have been carried out using control-oriented engine models for advanced combustion technologies, methods of adapting model parameters for these models have still not been considerably studied. In this paper, we propose a method to adapt model parameters for an ignition model and a combustion model of a physics-based discrete diesel engine model using neural networks. Using experimental data on an engine bench as well, we examined how to perform adapting and training, such as optimization algorithms, how to select training data, appropriate feature values, and algorithms for switching the neural networks according to the operating regions. As a result, this adaptation method was able to improve the prediction accuracy of the heat release rate of pre-combustion better than when adapted using the previous adaptation method and when the model parameters were fixed.
Method for Estimating Compression Ratio and Heat Transfer Multiplier Using GT-Power and Experimental Pressure Traces
Authors: Klingbeil Adam , Lavertu Thomas 
Published: December 2020

Abstract
Crank-angle resolved cylinder pressure data is valuable for characterizing engine performance and various techniques have been developed for post-processing the pressure traces to understand the rate of heat release and its overall impact on engine performance. However, many of these techniques rely on accurate knowledge of the compression ratio, which may not be well-known because of uncertainties in component dimensions for new and rebuilt engines. Additionally, uncertainties in cylinder pressure referencing and top dead center (TDC) offset can lead to variation in the calculation of these parameters.
A method was developed to estimate the compression ratio and heat transfer sensitivity for large bore diesel engines using GT-Power and experimental cylinder pressure traces. An injector cutout method was used on a 228.6mm bore 16-cylinder engine to record motoring cylinder pressure traces for an individual cylinder. The cylinder pressure traces were pegged thermodynamically by matching the slope of a 40-deg window of the compression trace with that of a GT-power simulation of a similar condition. Once the cylinder pressure was properly referenced, it was found that the compression ratio of the cylinder could be estimated by matching the slope of the compression trace over a larger crank angle window. Additionally, it is shown that the location of peak cylinder pressure is dependent on heat transfer and if the location of peak cylinder pressure relative to top dead center is accurately known, then the heat transfer coefficients in GT-Power can be estimated.
For an engine where the exact compression ratio may not be known due to variations in hardware dimensions (for both new and rebuilt engines), this method provides a simple path to estimating compression ratio. Furthermore, by measuring the exact location of TDC and comparing that to the location of peak cylinder pressure, heat transfer can be estimated.
Combustion and Emission Characteristics of a Diesel Engine Working With Diesel/Jojoba Biodiesel/Higher Alcohol Blends
Authors: EL-Seesy Ahmed I. , Nour Mohamed , Xuan Tiemin , He Zhixia , Hassan Hamdy 
Published: December 2020

Abstract
The main concerns of utilizing jojoba biodiesel in CI engines is that it has a high viscosity and high NOx formation. Therefore, this article purposes in endeavoring to improve the combustion and emission parameters of a CI engine working with diesel/jojoba biodiesel blend and higher alcohols under various engine loads. The higher alcohols typically are n-butanol, n-heptanol, and n-octanol, which are combined with 50% diesel, 40% of jojoba biodiesel at a volume portion of 10%, and they are designated as DJB, DJH, and DJO respectively. The jojoba biodiesel is manufactured via a transesterification process with facilitating mechanical dispersion. The findings display that there is a drop in pmax and HRR for DJB, DJH, and DJO blends compared to pure diesel fuel, whereas the combustion duration and ignition delay are extended. The brake specific fuel consumption is enlarged. Concerning engine emissions, the NOx formation is reduced while the CO, UHC, and soot emissions are increased for DJB, DJH, and DJO mixtures. It can be deduced that combining high fractions of jojoba biodiesel with C4, C7, and C8 alcohols have the feasible to accomplish low NOx formation in the interim having high thermal efficiency level.
Assessment of Spark, Corona, and Plasma Ignition Systems for Gasoline Combustion
Authors: Biswas Sayan , Ekoto Isaac , Singleton Dan , Mixell Kristapher , Ford Patrick 
Published: December 2020

Abstract
In the present study, the performance and emissions characteristics of three low-temperature plasma (LTP) ignition systems were compared to a more conventional strategy that utilized a high-energy coil (93 mJ) inductive spark igniter. All experiments were performed in a single-cylinder, optically accessible, research engine. In total, three different ignition systems were evaluated: (1) an Advanced Corona Ignition System (ACIS) that used radiofrequency (RF) discharges (0.5–2.0 ms) to create corona streamer emission into the bulk gas via four-prong electrodes, (2) a Barrier Discharge Igniter (BDI) that used the same RF discharge waveform to produce surface LTP along an electrode encapsulated completely by the insulator, and (3) a Nanosecond Repetitive Pulse Discharge (NRPD) ignition system that used a non-resistor spark plug and positive DC pulses (∼10 nanoseconds width) for a fixed frequency of 100 kHz, with the operating voltage-controlled to avoid LTP transition to breakdown. For the LTP ignition systems, pulse energy and duration (or number) were varied to optimize efficiency. A single 1300 revolutions per minute (rpm), 3.5 bar indicated mean effective pressure (IMEP) homogeneous operating point was evaluated. Equivalence ratio (ϕ) sweeps were performed that started at stoichiometric conditions and progressed toward the lean limit.
Both the ACIS and NRPD ignition systems extended the lean limit (where the variation of IMEP &lt; 3%) limit (ϕ = 0.65) compared to the inductive spark (ϕ = 0.73). The improvement was attributed to two related factors. For the ACIS, less spark retard was required as compared to spark ignition due to larger initial kernel volumes produced by four distinct plasma streamers that emanate into the bulk gas. For the NRPD ignition system, additional pulses were thought to add expansion energy to the initial kernel. As a result, initial flame propagation was accelerated, which accordingly shortens early burn rates.
Accessing social service support: Barriers experienced by Chinese migrants living in Auckland, Aotearoa New Zealand
Authors: Kan King Lok , Connor Helene , Beddoe Liz 
Published: December 2020

INTRODUCTION: According to Census 2013, approximately 25% of Auckland’s population is Asian, with the majority of these being Chinese. Given that Aotearoa New Zealand’s population is ageing, it can be expected that there will a significant demand for aged services for Chinese older adults in our local community in the future. Exploring the language barrier encountered by retired and aged (65+) Chinese migrants living in Auckland is needed.METHOD: Two focus groups were interviewed with retired Chinese migrants (group 1) and local social service practitioners (group 2). The focus group topics included the living experience of Chinese migrants in Auckland in Aotearoa New Zealand, while local social service practitioners reported their daily work experience of serving Chinese older adults. A short, warm-up, oral questionnaire stimulated discussion in each group. Data analysis was used to identify themes and draw tentative conclusions about the needs of older migrants and suggest how local aged- services providers could better serve retired Chinese migrants.FINDINGS: Language barriers and transportation problems were commonly agreed to be obstacles that hindered retired Chinese migrants accessing social support and health services. More input was needed to improve their general English language proficiency to facilitate their daily lives and participation in social life in Aotearoa New Zealand.IMPLICATIONS: Findings from the research have the potential to be an important resource for local social service practitioners, giving them a better understanding of older Chinese people.
Simulation-based training for increasing health service board members’ effectiveness: a cluster randomised controlled trial
Authors: Faulkner Nicholas , Wright Breanna , Lennox Alyse , Bismark Marie , Boag Jane , Boffa Sophie , Waxman Bruce , Watson-Kruse Janet , Paine Geoff , Bragge Peter 
Published: December 2020

ObjectivesThere is a paucity of research on how to improve the functioning of health service boards, despite their importance in influencing patient care. We examined the impact of simulation-based training on health service board members’ perceptions of their skills in communicating during board meetings and of board meeting processes.DesignProspective, cluster randomised controlled trial.SettingHealth service boards in Victoria, Australia.ParticipantsTwelve boards were randomised, and pre- and post-intervention data were collected and analysed from 57 members of these boards.InterventionsBoards were randomly allocated to either a treatment condition in which they received a 2-hour simulation-based training session or to a wait list control condition.Primary and secondary outcome measuresPrimary outcome variables were board members’ perceptions regarding: (1) their skill and confidence in communicating during board meetings and (2) processes at their board meetings. Measures were collected in the intervention group before and 3 months post-training and compared with a wait list control group.ResultsSkills and confidence in communicating during board meetings was higher after training (control marginal mean=5.11, intervention marginal mean=5.42, mean difference=0.31, 90% CI (−0.03 to 0.66), one-sided p=0.068, d=0.40). Board meeting processes were also improved after training (control marginal mean=4.97, intervention marginal mean=5.37, mean difference=0.40, 90% CI (0.14 to 0.65), one-sided p=0.005, d=0.54).ConclusionsSimulation-based training appeared to improve board members’ skills and confidence, and perceptions of board meeting processes. A larger scale trial is needed to examine possible impacts on patient outcomes.Trial registrationOpen Science Framework: http://osf.io/jaxt6/; Pre-results.
Ambulatory oxygen for treatment of exertional hypoxaemia in pulmonary fibrosis (PFOX trial): a randomised controlled trial
Authors: Holland Anne E , Corte Tamera , Chambers Daniel C , Palmer Andrew J , Ekström Magnus Per , Glaspole Ian , Goh Nicole S L , Hepworth Graham , Khor Yet H , Hoffman Mariana , Vlahos Ross , Sköld Magnus , Dowman Leona , Troy Lauren K , Prasad Jyotika D , Walsh James , McDonald Christine F 
Published: December 2020

IntroductionInterstitial lung diseases are characterised by scarring of lung tissue that leads to reduced transfer of oxygen into the blood, decreased exercise capacity and premature death. Ambulatory oxygen therapy may be used to treat exertional oxyhaemoglobin desaturation, but there is little evidence to support its efficacy and there is wide variation in clinical practice. This study aims to compare the clinical efficacy and cost-effectiveness of ambulatory oxygen versus ambulatory air in people with fibrotic interstitial lung disease and exertional desaturation.Methods and analysisA randomised, controlled trial with blinding of participants, clinicians and researchers will be conducted at trial sites in Australia and Sweden. Eligible participants will be randomised 1:1 into two groups. Intervention participants will receive ambulatory oxygen therapy using a portable oxygen concentrator (POC) during daily activities and control participants will use an identical POC modified to deliver air. Outcomes will be assessed at baseline, 3 months and 6 months. The primary outcome is change in physical activity measured by number of steps per day using a physical activity monitor (StepWatch). Secondary outcomes are functional capacity (6-minute walk distance), health-related quality of life (St George Respiratory Questionnaire, EQ-5D-5L and King’s Brief Interstitial Lung Disease Questionnaire), breathlessness (Dyspnoea-12), fatigue (Fatigue Severity Scale), anxiety and depression (Hospital Anxiety and Depression Scale), physical activity level (GENEActive), oxygen saturation in daily life, POC usage, and plasma markers of skeletal muscle metabolism, systematic inflammation and oxidative stress. A cost-effectiveness evaluation will also be undertaken.Ethics and disseminationEthical approval has been granted in Australia by Alfred Hospital Human Research Ethics Committee (HREC/18/Alfred/42) with governance approval at all Australian sites, and in Sweden (Lund Dnr: 2019-02963). The results will be published in peer-reviewed scientific journals, presented at conferences and disseminated to consumers in publications for lay audiences.Trial registration numberClinicalTrials.gov Registry (NCT03737409).
Prevalence of multimorbidity in South Africa: a systematic review protocol
Authors: Roomaney Rifqah A , van Wyk Brian , Turawa Eunice Bolanle , Pillay-van Wyk Victoria 
Published: December 2020

IntroductionMultimorbidity has increased globally over the past two decades, due to ageing populations and increased burden of non-communicable diseases (NCDs). In a country like South Africa, with a growing burden of NCDs and a high prevalence of HIV, information on multimorbidity can improve planning for healthcare delivery and utilisation, and reduce costs in the context of constrained health resources. This review aims to synthesise prevalence studies on multimorbidity, and identify dominant clusters and trends of multimorbidity in South Africa.Methods and analysisWe will search electronic bibliographic databases (PubMed, Scopus, JSTOR, POPLINE, PsycINFO, ScienceDirect, Web of Science and CINAHL), and the reference lists of included articles. Two researchers will independently screen title and abstracts, and then full text to identify studies published before and in 2020 that report on prevalence of multimorbidity in South Africa. Risk of bias assessments will be done for each study. Information on the prevalence of multimorbidity and disease clusters will be extracted from each study. Where possible, prevalence of specific clusters of multimorbidity will be pooled using a random effects meta-analysis to account for variability between studies. The I2 statistic will be used to establish the extent of heterogeneity due to variation in prevalence estimates rather than due to chance. The systematic review will be reported according to the Preferred Reporting Items for Systematic reviews and Meta-Analyses.Ethics and disseminationOnly published journal articles will be included in the systematic review. This review received ethics approval as part of a larger project by the University of the Western Cape Biomedical Science Research Ethics Committee (BM20/5/8). The findings from this research will be used to estimate the prevalence of multimorbidity in South Africa and will contribute to the design of future research projects. The findings will be disseminated in a peer-reviewed journal article.PROSPERO registration numberCRD42020196895.
Challenges and facilitators of implementation of an information communication and technology (ICT)-based human resources management tool in the government health sector in Bangladesh: protocol for an exploratory qualitative research study
Authors: Bhattacharyya Dipika Shankar , Shafique Sohana , Akhter Sadika , Rahman Aminur , Islam Md Zahidul , Rahman Nawsiba , Anwar Iqbal 
Published: December 2020

IntroductionTo improve human resources for health (HRH) management in Bangladesh, the directorate general of health services (DGHS) introduced a new information and communications technology (ICT) tool, named ‘human resources information system (HRIS)’, to process real-time HRH data of all facilities under the DGHS. However, synchronisation is a major concern since multiple authorities are involved in the implementation of the tool at different tiers of the health system. Introducing ICT tools in healthcare organisations has always proved challenging as evidence from low-income and middle-income countries suggests. The knowledge gap in terms of factors that support or constrain the successful implementation of the HRIS in Bangladesh will be investigated in this exploratory study to identify ways of engaging the key stakeholders in a better way for an effective use of the tool.Methods and analysisDesk review and qualitative data collection methods will be used to address the study objectives. Key informant interviews and in-depth interviews will be conducted to explore perspectives of policy-makers, programme managers, service providers and other stakeholders to understand the barriers to implementing HRIS in the context of Bangladesh. We plan to organise stakeholder consultation workshops to validate the qualitative study findings and to seek suggestions for ensuring a successful implementation of the HRIS. Framework analysis will be applied to analyse qualitative data, and an outline with the definitions of a priori codes guided by the policy engagement framework will be prepared. Besides, emerging themes will also be identified. A data display matrix will be prepared to summarise and interpret the findings for policy review.Ethics and disseminationThe research review committee and the ethical review committee of icddr,b have approved the research protocol. Findings from the study will be communicated through national and international forums, conferences, policy briefs and peer-reviewed journal publications.
Characterization of tomato accessions for morphological, agronomic, fruit quality, and virus resistance traits
Authors: Grozeva Stanislava , Nankar Amol N. , Ganeva Daniela , Tringovska Ivanka , Pasev Gancho , Kostova Dimitrina 
Published: December 2020

Characterization of local germplasm is an effective way to identify elite breeding material and develop improved varieties. This study was aimed to assess 52 tomato accessions comprised of local varieties (28), landraces (8), breeding lines (14), and wild relatives (2), and their characterization for 30 morphological/agronomic, four fruit quality, and tomato mosaic virus (ToMV) resistance traits. Morphological, quality, and ToMV traits were evaluated using phenotyping, biochemical assays, and molecular markers, respectively. Fruit shape and size showed appreciable variation, with fruits varying from rounded to heart shaped and small to big size. Significant variation was observed for fruit weight (1.6–564.8 g), fruits per plant (6.0–174.7), productivity (130.5–5146.5 g), soluble solids (4.1%–8.4%), vitamin C (9.5–46.4 mg·100 g−1), antioxidant activity (2.5–9.6 μmol Fe2+·g−1fresh weight), and total polyphenols (23.9–124.2 GAE·100 g−1fresh weight). All accessions were phenotypically screened for the virus resistance in the growth chamber, and CAPS molecular markers were used to identify accessions with ToMV Tm-22resistant alleles, and accessions LYC-13, LYC-15, LYC-17, LYC-26, and LYC-52 were identified as resistant. Multivariate analysis of morphological and quality traits showed that 35 principal components contributed to the total variation and the first two and 12 principal components explained 47.2% and 90% of the variation, respectively. The evaluated tomato collection appears to have breeding potential, and around 20% of the accessions in the collection (LYC-6, LYC-17, LYC-18, LYC-26 to LYC-31, and LYC 33) are promising genetic resources for variety development that are enriched with enhanced fruit quality and high yield.
Electrical impedance investigation of gamma-irradiated TlInS2〈5%C〉 crystals
Authors: Samedov O. A. , Alekperov O. Z. , Orudjova Kh. B. , Mehtiyev N. M. , Nadjafov A. I. , Gabulov I. A. , Huseynov E. M. 
Published: December 2020

In this article, the authors carry out a pioneering study of monocrystalline TlInS[Formula: see text] at higher than room-temperatures using impedance spectroscopy. It is shown that in TlInS[Formula: see text] crystals at temperatures higher than 400 K, the nature of conductivity is predominantly ionic. Moreover, characteristics of impedance spectra behavior of TlInS[Formula: see text] monocrystal samples were studied using the measurement frequency range of 25–106 Hz. For the measured frequency range, it is shown that curves of active and reactive impedance components undergo a dispersion characterized by decreasing values of [Formula: see text] and [Formula: see text], as the frequency of the electric field and radiation dose increases.
The investigation of the acousto-photovoltaic effect in single crystals TlIn1−xGaxSe2
Authors: Gojayev E. M. , Mamedova G. N. , Osmanova S. S. , Mehdiyeva Sh. M. , Jabarov S. H. 
Published: December 2020

In this work, TlIn[Formula: see text]Ga[Formula: see text]Se2 single crystals were grown by zone recrystallization methods and their X-ray phase analysis was performed. The lattice parameters were determined and it was found that crystals based on the original TlIn[Formula: see text]Ga[Formula: see text]Se2 compound crystallized in the same tetragonal symmetry, the space group [Formula: see text]. It was revealed that with partial substitution of indium atoms by gallium atoms in the TlIn[Formula: see text]Ga[Formula: see text]Se2 lattice, the parameters of unit cells change according to the additivity law. First time it was found that with the simultaneous influence of electromagnetic and sound waves, an electromotive force (e.m.f.) occurs or short circuit current. The studies were carried out in the frequency range of electromagnetic radiation of 50–143 kHz. It was revealed that when the investigated crystals were irradiated with magnetic radiation in the absence of sound waves, there was no e.m.f. on the electrodes as well as memory when exposed only to sound. Based on the existing theoretical information, the nature of the revealed single crystal of the acousto-photovoltaic effect was explained.