Autor: Mishra, Abhishek - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Fabrication and Characterization of Al6061-Nano Al2O3 Composites by Ultrasonic Assisted Stir Casting followed by Heat Treatment and Hot Forging
Autorzy:: Purohit, Rajesh
Qureshi, M.M.U.
Kumar, Ashish
Mishra, Abhishek
Rana, R.S.
Powiązania:: https://bibliotekanauki.pl/articles/28099519.pdf
Data publikacji:: 2023
Wydawca:: Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:: Al6061 alloy
Al6061-Al2O3 nanocomposites
XRD analysis
FESEM
mechanical properties
automotive gears
Opis:: The present work comprises the development of Al6061/nano Al2O3 composites with 0 to 4 weight percent in steps of 0.5 wt. % of nano alumina particles by using ultrasonic assisted stir casting. Casted samples were subjected to heat treatment and hot forging. Further forged and heat-treated gear blanks of nano Al2O3 (0 to 3.0 weight %) reinforced nanocomposites were machined to make spur gears for the wear test. The results have shown that nano Al2O3 reinforcement in the Al6061 matrix with heat treatment and forging improves the hardness and compressive strength up to 3.5 wt. %, after that, it starts decreasing because of the agglomeration of nano alumina particles. SEM results reveal grain refinement of the pure alloy after reinforcement. Removal of porosity and voids observed after forging operation. Wear resistance increasing with incorporation of Al2O3 nanoparticles in base alloy, reinforcement wt. %, precipitation hardening and hot forging also improves wear resistance and mechanical properties. These composites have widespread applications in gear, brake discs, crankshaft, clutch plates, pistons, and other components of automobiles and aircraft structures.
Źródło:: Archives of Metallurgy and Materials; 2023, 68, 2; 791--798
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Application of Box-Jenkins method and Artificial Neural Network procedure for time series forecasting of prices
Autorzy:: Singh, Abhishek
Mishra, G. C.
Powiązania:: https://bibliotekanauki.pl/articles/465876.pdf
Data publikacji:: 2015
Wydawca:: Główny Urząd Statystyczny
Tematy:: forecasting
feed forward network
ARIMA
ANN
Opis:: Forecasting of prices of commodities, especially those of agricultural commodities, is very difficult because they are not only governed by demand and supply but also by so many other factors which are beyond control, such as weather vagaries, storage capacity, transportation, etc. In this paper time series models namely ARIMA (Autoregressive Integrated Moving Average) methodology given by Box and Jenkins has been used for forecasting prices of Groundnut oil in Mumbai. This approach has been compared with ANN (Artificial Neural Network) methodology. The results showed that ANN performed better than the ARIMA models in forecasting the prices.
Źródło:: Statistics in Transition new series; 2015, 16, 1; 83-96
1234-7655
Pojawia się w:: Statistics in Transition new series
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Obstructive sleep apnea risk for driving license applicants in India – A community based study
Autorzy:: Dubey, Abhishek
Bajaj, Darshan K.
Mishra, Apurva
Singh, Balendra P.
Gupta, Vinay
Kant, Surya
Dixit, Swati
Powiązania:: https://bibliotekanauki.pl/articles/2161795.pdf
Data publikacji:: 2017-10-18
Wydawca:: Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
Tematy:: obstructive sleep apnea
drivers
sleepiness
road traffic accidents
STOP-Bang
high blood pressure
Opis:: Objectives: To determine the risk of obstructive sleep apnea (OSA) for male permanent driving license (DL) applicants of Lucknow, India. Material and Methods: In this cross-sectional community based, study body mass index, waist–hip ratio, blood pressure of each subject were determined as an anthropometric parameter along with the history of habit of smoking, tobacco chewing, alcohol consumption. STOP-Bang (Snoring, Tired or sleepy, Observed apnea, high blood Pressure, Body mass index, Age, Neck, Gender) Questionnaire – a scoring risk assessment tool – was applied for assessment of OSA risk (high OSA risk defined by score ≥ 3) for 542 male DL recipients at 2 Regional Transport Office (RTO) centers in Lucknow, India. The statistical software SPSS 17.0 was applied to the testing. Results: In total 23% (N = 125) of participants were found with the risk of OSA. High blood pressure (≥ 140/90 mm Hg) was found for the maximum number of participants (40.5%) followed by neck circumference > 40 cm (17.1%), age (> 50 years old) (15.3%), snoring (12.3%) and tired/sleepy (10.5%). Mean values of age, anthropometric measurements and blood pressure were observed significantly higher (p < 0.001) for participants with the OSA risk. In this population the risk of OSA risk (STOP-Bang score ≥ 3) was observed for 6.7% of young (< 35 years old), 34% of middle (35–45 years old) and 73% of elder age adults (> 45 years old). Conclusions: In view of findings of this study a high number of male driving license applicants were observed with the risk of OSA. Therefore efforts should be made to develop a national screening guideline/protocol for the OSA risk assessment for driving license applicants in India. This may reduce the possibility of road traffic accidents due to the OSA-associated fatigue and drowsiness behind the wheels. Int J Occup Med Environ Health 2018;31(1):25–36
Źródło:: International Journal of Occupational Medicine and Environmental Health; 2018, 31, 1; 25-36
1232-1087
1896-494X
Pojawia się w:: International Journal of Occupational Medicine and Environmental Health
Dostawca treści:: Biblioteka Nauki

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