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Generation of Rate-of-Injection (ROI) profile for Computational Fluid Dynamics (CFD) model of Internal Combustion Engine (ICE) using machine learning

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能源与人工智能(英文) 2022年第2期8卷 100-115页

作者： Zachary Williams ahmed moiz khanh Cung Mike Smith Thomas Briggs Christopher Bitsis Jason Miwa Southwest Research Institute United States

Injector configuration and spray characteristics are important parameters that define diesel combustion and emissions performance. One of the critical spray inputs is the Rate-of-Injection (ROI) profile. The ROI profile depends on the spray’s operating conditions, including nozzle geometry (e.g., nozzle diameter), injection pressure, and injection duration. Besides, the internal nozzle flow phenomenon and external ambient conditions can further impact fuel introduction characteristics. This study measured the ROI profile of a heavy-duty (multi-hole) diesel injector using the Bosch tube technique. Injection pressure and injection duration were varied from 600 to 2600 bar and 0.5–3.0 ms, respectively. After post-processing, measurement data were then used to train numerical models, including a developed machine learning (ML) model that can create very similar ROI profiles with experimental data. Next, a Computational Fluid Dynamics (CFD) simulation used the ROI profile generated by ML model. For comparison, there are other simplified ROI profiles used in similar CFD simulation configuration. Results showed that the any difference in ROI profiles could affect the combustion and emissions significantly. This further emphasizes the need to provide high-fidelity spray input in terms of ROI profile for CFD simulation. The current ML model can deliver a realistic ROI profile for any given rail pressure and injection duration.

关键词： Rate of Injection Diesel injector Machine learning CFD

Textile Environmental Conditioning: Effect of Relative Humidity Variation on the Tensile Properties of Different Fabrics

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Journal of Analytical Sciences, Methods and Instrumentation 2012年第2期2卷 92-97页

作者： Mansoor Iqbal Munazza Sohail Aleem ahmed Kamran ahmed Arsheen moiz Khalil ahmed Applied Chemistry Research Centre PCSIR Laboratories Complex Karachi Pakistan

With the aim that to confirm the need for humidity control in the environment in which textile sample are visually and instrumentally analyzed, three different pre-conditioned fabrics sample of cotton, polyester and silk were treated at a fix temperature of 21?C. The relative humidity adjusted to four levels: 55%, 65%, 75% and 85% RH for a conditioning time of 24 hours as specified in ASTM D-1776-98. It has been observed that as the relative humidity increase from 55% to 85% cotton increase its tensile strength, silk losses its strength and there was no significant change observed in the tensile strength of polyester fabric.

关键词： Tensile Properties Relative Humidity Temperature Fiber Silk Polyester Cotton

Comparison between Pigment Printing Systems with Acrylate and Butadiene Based Binders

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Journal of Analytical Sciences, Methods and Instrumentation 2012年第2期2卷 87-91页

作者： Mansoor Iqbal Javaid Mughal Munazza Sohail Arsheen moiz Kamran ahmed Khalil ahmed Applied Chemistry Research Centre PCSIR Laboratories Complex Karachi Pakista Applied Chemistry Research Centre PCSIR Laboratories Complex Karachi Pakistan

Pigment printing was carried out on lab scale by simple screen-printing techniques. By the application of acrylate and butadiene based binder, the crocking fastness, formaldehyde release and PVC migration of fabric printed with Imparon red KB pigment was evaluated. The effect of curing time on K/S values was also investigated. It has been found that butadiene based binder shows good performance in terms of crocking fastness, formaldehyde release and PVC migra-tion. It has also been observed that by increasing the binder concentration, the release of formaldehyde decreased and by increasing the curing time, the K/S values of printed fabric were decreased.

关键词： Printing Pigment Binder Acrylate Butadiene

In-hospital acute upper gastrointestinal bleeding: What is the scope of the problem?

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World Journal of Gastrointestinal Endoscopy 2019年第12期11卷 561-572页

作者： Fady G Haddad Talal El Imad Najib Nassani Raymond Kwok Hassan Al Moussawi Abhishek Polavarapu moiz ahmed Youssef El Douaihy Liliane Deeb Department of Gastroenterology and Hepatology Staten Island University HospitalStaten IslandNY 10305United States Department of Gastroenterology and Hepatology University of Illinois at ChicagoChicagoIL 60607United States Department of Internal Medicine Staten Island University HospitalStaten IslandNY 10305United States Department of Gastroenterology and Hepatology Icahn School of Medicine at Mount Sinai Elmhurst Hospital CenterElmhurstNY 11373United States

BACKGROUND Acute upper gastrointestinal bleeding(AUGIB)is a frequently encountered condition in the Gastroenterology field with a mortality rate of 10-14%.Despite recent newer innovations and advancements in endoscopic techniques and available medications,the mortality rate associated with AUGIB remained persistently *** To explore mortality,characteristics and outcome differences between hospitalized patients who develop AUGIB while in-hospital,and patients who initially present with *** This is a retrospective of patients who presented to Northwell Health Staten Island University Hospital from October 2012 to October 2016 with AUGIB that was confirmed *** were divided in two groups:Group 1 comprised patients who developed AUGIB during their hospital stay;group 2 consisted of patients who initially presented with AUGIB as their main *** characteristics,time to endoscopy,endoscopy findings and interventions,and clinical outcomes were collected and compared between *** A total of 336 patients were *** 1 consisted of 139 patients and group 2 of 196 *** was significantly higher in the 1st group compared to the 2nd(20%vs 3.1%,P≤0.05).Increased length of stay(LOS)was noted in the 1st group(13 vs 6,P≤0.05).LOS post-endoscopy,vasopressor use,number of packed red blood cell units and patients requiring fresh frozen plasma were higher in group *** were more likely to be on corticosteroids,antiplatelets and ***,the mean time from bleeding to undergoing upper endoscopy was significantly lower in group 1 compared to group *** In-hospital AUGIB is associated with high mortality and morbidity despite a shorter time to *** scale studies assessing the role of increased comorbidities and antithrombotic use in this setting are warranted.

关键词： Upper gastrointestinal bleeding Melena Hematemesis