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Airborne Acoustic Transmission and Terrain Topography at SAINTGITS Amphitheatre:An Analysis of Outdoor Auditory Perception and Comparison of contour plots

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Sound & Vibration 2022年第3期56卷 255-274页

作者： Jacob Thottathil Varghese Sajan Thomas Joselin Herbert Chacko Preno Koshy Arjun Venugopal Department of Mechanical Engineering SAINTGITS College of EngineeringKottayam686532India APJ Abdul Kalam Technological University ThiruvanathapuramKerala695016India Part-Time Research Scholar Department of Mechanical EngineeringNICHENagercoil629180India Department of Mechanical Engineering NICHENagercoilTamil Nadu629180India

The arrangement of natural and physical features on the earth’s surface are a few among the countless items that govern the airborne acoustic transmission at boundary *** particular,if the acoustic waves are attributes of live concerts at open-air theatres,without losing the sheen and quality,the audience should certainly receive the unbroken depth of the ***,at all times,it is advisable to analyse the auditory receptiveness,particularly in all intended recreational *** current pandemic circumstances and the mandated COVID-19 prevention protocols encourage gatherings in naturally ventilated outdoor regions than confined *** work predicts and quantifies the acoustic experience at the naturally carved amphitheatre at SAINTGITS,an autonomous institution at the down South-West of the Indian *** entire recreational space at SAINTGITS AMPHI was separately modelled as a Base case and Advanced case,and were analysed using the acoustic modelling module of EASE Focus,a renowned simulation freeware,which is in strict adherence with the International *** variation in loudness received at the nearest and farthest ends of the amphitheatre was between 67 to 80 *** the Zero frequency SPL(Z-weighting)exhibited the loudness in the range of 81 to 85 dB and could maintain a safer auditory level for any human ear,it was confined to a hemispherical region near the sound source.A vertical beam angle of−4.0°was found to be effective *** procedures and analyses will certainly help the future organizers and stakeholders to effectively plan the resources to reap rich acoustic experience at terrain-centric *** surface topography and contours were plotted with another set of freeware,the CADMAPPER and the QUIKGRID,to compare terrain gradient with the known ***,this interdisciplinary research exhibits the extensive simulation capability of both EASE Focus and QUIKGRID and demonstrates the modelling v

关键词： Acoustic airborne transmission Sound Pressure Level(SPL) Amphitheatre SAINTGITS contour plot terrain topology safe acoustics

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Derivation and validation of a preoperative prognostic model for resectable pancreatic ductal adenocarcinoma

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Hepatobiliary & Pancreatic Diseases International 2023年第2期22卷 160-168页

作者： Shuai Xu Xiu-Ping Zhang Guo-Dong Zhao Wen-Bo Zou Zhi-Ming Zhao Qu Liu Ming-Gen Hu Rong Liu Faculty of Hepato-Biliary-Pancreatic Surgery The First Medical CenterChinese PLA General HospitalBeijing 100853China Department of Liver Transplantation and Hepatobiliary Surgery Shandong Provincial Hospital Affiliated to Shandong First Medical UniversityJinan 250021China

Background: The prognosis of patients with pancreatic ductal adenocarcinoma(PDAC) remains poor even after radical pancreaticoduodenectomy(PD). The study aimed to develop and validate a novel preoperative prognostic model to accurately predict the long-term survival of patients with ***: Patients with PDAC of pancreatic head from Chinese PLA General Hospital were included. The preoperative PDAC model with contour plots was developed using a non-linear model in the training cohort and then tested in the validation ***: Of 421 patients who met the inclusion criteria, 280 were in the training cohort and 141 in the validation cohort. contour plots for preoperative PDAC model were established to visually predict the survival probabilities of these patients, based on preoperative carbohydrate antigen 19-9, preoperative fibrinogen to albumin ratio and pain symptoms. This model stratified patients into low-and high-risk groups with distinctly different long-term survival in the training cohort [median overall survival(OS)32.1 vs. 17.5 months;median recurrence-free survival(RFS) 19.3 vs. 10.0 months, both P < 0.001] and the validation cohort(median OS 28.3 vs. 19.0 months;median RFS 17.5 vs. 11.2 months, both P < 0.001).Time-dependent receiver operating characteristic and decision curve analyses revealed that the model provided higher diagnostic accuracy and superior net benefit compared to other staging ***: This study constructed and validated a novel preoperative prognostic model that can accurately and conveniently predict the long-term survival of patients with resectable PDAC of pancreatic head. Besides, the model can screen high-risk patients with poor prognosis, which may provide references for personal treatment strategies in the future.

关键词： Pancreatic ductal adenocarcinoma Pancreaticoduodenectomy contour plot Overall survival Recurrence-free survival

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Development of a Predictive Model to Improve the Hardness of Mild Steel Welded Joint

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Engineering（科研） 2021年第4期13卷 215-223页

作者： O. O. Ogbeide L. M. Ebhota Department of Production Engineering University of Benin Benin City Nigeria Groove Engineering & Integrated Services Limited Lagos Nigeria

Structural integrity of weldment is greatly influenced by its process parameters and usually, it is expected for a welded joint to be stronger than its parent metal, but in actual fact, most failures occur at the welded joints and it is mostly due to poor combination of process parameters or inexperience of the welder. This poor combination leads to poor hardness exhibited at the welded joint. The aim of this study is to predict and improve the hardness of mild steel welded zone using the tungsten inert gas (TIG) welding process. Response Surface Methodology (RSM) was employed to analyze the welded response. 200 pieces of mild steel coupons measuring 27.5 × 10 × 10 mm were prepared and used for the experiment, the experiment was performed 20 times, using 5 specimens for each run, after which the hardness was measured and results analyzed respectively. The study produced eighteen (18) optimum results with the best selected to produce a material hardness of 299.269 N/mm2 with desirability of 95.6%, resulting from current of 120 amp, voltages of 20 and gas flow rate of 12 L/min.

关键词： RSM TIG Mild Steel contour plot

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