19 results for "T. Ramkumar"

Effect of Nickel on the Microstructure, Mechanical and Tribological Properties of Austempered Ductile Cast Iron for Steering Knuckle Applications

T. Ramkumar; S. Madhusudhanan; I. Rajendran

Archives of Metallurgy and Materials, Vol. vol. 65 No. No 1 · 2020 · English · DOAJ

The research article address, the mechanical properties such as fatigue, impact strength and tribological properties of Austempered ductile iron (ADI) has been investigated. The samples of ADI iron were austenitized at 927°C for 2 hrs and later it was under austempering process for 2 hrs at a…

Experimental Investigation on the Machining Behaviour, Surface Integrity and Tool Wear Analysis in Environment Friendly Milling of Inconel 825

D. Nathan; T. Ramkumar; M. Selvakumar

Archives of Metallurgy and Materials, Vol. vol. 69 No. No 4 · 2024 · English · DOAJ

The study investigated end milling of Inconel 825 with varying spindle speed (N), feed rate (f) and axial depth of cut (da) with Minimum Quality Lubricant (MQL) and flooded lubrication. Molybdenum disulfide (MoS2) with the average particle size of 10 µm was used as lubricating agent. Work…

Characterization of Natural Cellulosic Fiber from Cereus Hildmannianus

Senthil Ganesh Subramanian; R. Rajkumar; T. Ramkumar

Journal of Natural Fibers, Vol. 18 No. 3 · 2021 · English · DOAJ Scopus

The research article aims to characterize the physicochemical, morphological, thermal and mechanical properties of novel Cereus Hildmannianus Fibers (CHFs) are reported for the first time in this work. The lower density (1.364 ± 0.026 g/cm3) with high cellulose content of the CHF (58.40 ± 0.56…

Characterization of New Natural Cellulosic Fiber from Coconut Tree Primary Flower Leaf Stalk Fiber (CPFLSF)

Rama Thirumurugan; M. Jayaraj; D. Shanmugam et al.

Journal of Natural Fibers, Vol. 18 No. 11 · 2021 · English · DOAJ Scopus

The properties of the chemical, physical, mechanical, thermal(TG & DSC),microscopic analysis(SEM), x-ray diffraction(XRD),Fourier-transform infrared spectroscopy(FTIR) of raw and alkali treated coconut tree primary flower leaf stalk fiber (CPFLSF) are reported for the first time in this work…

Enrichment of heavy metals as function of salinity and pH of estuarine sediments, South East Coast of India

R. Rumuri; T. Ramkumar; S. Vasudevan et al.

Geology, Ecology, and Landscapes, Vol. 0 No. 0 · 2021 · English · DOAJ Scopus

A predictive model was developed to determine the combined effect of salinity and pH on sediments enrichment of heavy metals; (EF) of Zn, Pb, Cu, and Ni in Uppanar estuary, India. Data covered four seasons of 2008–2009 and 2009–2010, and corresponded to fivestations scattered along Uppanar estuary…

Effect of B4C Reinforcement on the Dry Sliding Wear Behaviour of Ti-6Al-4V/B4C Sintered Composites Using Response Surface Methodology

T. Ramkumar; P. Narayanasamy; M. Selvakumar et al.

Archives of Metallurgy and Materials, Vol. vol. 63 No. No 3 · 2018 · English · DOAJ

The present investigation has been made to assess the influence of B4C reinforced with Ti-6Al-4V matrix prepared by powder metallurgy route. High energy ball milling was used to prepare the composites. Cylindrical preforms were prepared using suitable die set assembly. The green preforms were…

A Robust Deep CNN Stacked Ensemble Classifier for Skin Disease Diagnosis

B. Valarmathi; Dhanush Chalicheemala; T. Ramkumar et al.

Advances in Public Health, Vol. 2025 · 2025 · English · DOAJ Scopus

Skin diseases are more prevalent than other diseases and are caused by bacteria, allergies, and viruses. Advancements in medical technology, including lasers and photonics, enable faster and more precise diagnosis of skin illnesses. However, the expense of such diagnostics is huge, hence the need…

Effect of graphene on the tribological behavior of Ti6Al6V2Sn/Gn composite produced via microwave sintering

U.V. Akhil; N. Radhika; T. Ramkumar et al.

International Journal of Lightweight Materials and Manufacture, Vol. 7 No. 1 · 2024 · English · DOAJ Scopus

Titanium alloys are widely used in various industrial applications due to their excellent properties. Due to its excellent heat conductivity and stability, graphene (Gn) can help Ti components last longer and experience less wear. In the current study, Ti6Al6V2Sn (Ti662) with various wt.% Gn was…

Cell viability and bioactive coating on additive manufactured polycaprolactone substrate for osteointegration applications

K Hariharan; M. Selvakumar; T. Ramkumar et al.

Chemical Physics Impact, Vol. 8 · 2024 · English · DOAJ Scopus

Polycaprolactone (PCL) finds its application in the medical field in the areas of suture materials, scaffolds for tissue engineering and medical devices fabrication. To improve the anchoring or osteointegration of PCL, bioactive material will be reinforced or deposited as a layer over the PCL…

Rietveld refinement of powder X-ray diffraction, microstructural and mechanical studies of magnesium matrix composites processed by high energy ball milling

T. Ramkumar; M. Selvakumar; R. Vasanthsankar et al.

Journal of Magnesium and Alloys, Vol. 6 No. 4 · 2018 · English · DOAJ Scopus

This research reports the processing of magnesium matrix composites reinforced with silicon carbide (SiC) and aluminium oxide (Al2O3) using powder metallurgy technique through high energy milling. Samples of Mg–SiC and Mg–Al2O3 composites subjected to high energy ball milling for different vol% of…

Extraction and Characterization of New Natural Cellulosic Chloris barbata Fiber

P. Balasundar; P. Narayanasamy; P. Senthamaraikannan et al.

Journal of Natural Fibers, Vol. 15 No. 3 · 2018 · English · DOAJ Scopus

Natural swollen finger grass fibers being novel are botanically known as “Chloris barbata fibers (CBFs)” and are selected for this study in order to understand their morphological properties. The CBF has higher cellulose (65.37 wt%) content and lower density (634 kg/m3). Crystallinity Index (CI) of…

Robotic radiosurgery treatment in liver tumors: Early experience from an Indian center

Debnarayan Dutta; Sathiya Krishnamoorthy; H Sudahar et al.

South Asian Journal of Cancer, Vol. 7 No. 3 · 2018 · English · DOAJ Scopus

Purpose: The purpose of this study is to report CyberKnife experience in hepatocellular carcinoma (HCC) and liver metastasis (LM). Materials and Methods: Fifty liver lesions in 31 consecutive patients with liver lesion [mean age 54.5 years (range 32-81 years), 77% were male patient, GTV 90cc in 8…

Prevalence of Musculoskeletal Disorders and Associated Risk Factors Among Professional Drivers in Chromepet, Chengalpattu District: A Cross-Sectional Study

Gopakumar, Gokul; V, Aljin; Surathkumaar, Hariharan et al.

Cureus · 2025 · English · PubMed Central

Background Professional drivers frequently suffer from musculoskeletal disorders (MSDs) due to prolonged sitting, poor posture, repetitive movements, and exposure to whole-body vibrations. These factors contribute to pain and discomfort, commonly affecting the shoulders, limbs, back, and neck…

Prevalence of Social Media Addiction and Its Determinants Among College Students in Chengalpattu District, Tamil Nadu

Gopakumar, Gokul; Surathkumaar, Hariharan; T, Ramkumar et al.

Cureus · 2025 · English · PubMed Central

Introduction A persistent desire to use social media platforms is an indication of social media addiction, which has an adverse impact on academic performance, mental health, and social connections. According to WHO statistics, the percentage of adolescents using social media increased from 7% in…

Characterization of cellulosic fibers from Morus alba L. stem

R. Prithivirajan; P. Balasundar; R. Shyamkumar et al.

Journal of Natural Fibers, Vol. 16 No. 4 · 2019 · English · DOAJ Scopus

The chemical microstructural, physical, and thermal properties of the Morus alba L. stem fibers (MAFs) are described for the first time in this work. By analyzing the results of chemical composition, it was observed that the cellulose content of the stem of MAFs is an acceptable value when compared…

Corrosion behavior of ZrC particles reinforcement with Al-12Si composites by weight loss method using acidic media

C.F. John; T. Ramkumar; R.C. Paul et al.

Bulletin of the Polish Academy of Sciences: Technical Sciences, Vol. 66 No. No 1 · 2018 · English · DOAJ Scopus

Surface structural features and wear analysis of a multilayer Ti6Al4V-B4C thin film coated AISI 1040 steel

R Malkiya Rasalin Prince; N Selvakumar; D Arulkirubakaran et al.

Materials Research Express, Vol. 7 No. 1 · 2020 · English · DOAJ Scopus

The deprived wear resistance of AISI 1040 steel often results in higher wear rates. The best ways to upgrade their wear resistance are to introduce hard particle reinforcement to produce a metal matrix composite which can be used as a coating. In the present study Ti-6Al-4V-4B _4 C metal matrix…

A New Natural Cellulosic Pigeon Pea (Cajanus cajan) Pod Fiber Characterization for Bio-degradable Polymeric Composites

R. Shyam Kumar; P. Balasundar; Naif Abdullah Al-Dhabi et al.

Journal of Natural Fibers, Vol. 18 No. 9 · 2021 · English · DOAJ Scopus

High performance natural cellulosic fiber can contribute to fiber-reinforced polymer composites or as organic fillers through replacement of the synthetic or man-made fibers. The natural fibers extracted from various parts of plant sources provides healthy and sustainable environment. Hence, the…

Characterization of Musa paradisiaca L. Cellulosic Natural Fibers from Agro-discarded Blossom Petal Waste

R. Prithivirajan; P. Narayanasamy; Naif Abdullah Al-Dhabi et al.

Journal of Natural Fibers, Vol. 17 No. 11 · 2020 · English · DOAJ Scopus

Musa paradisiaca L. blossom petal (MPBP) fibers are extracted from banana plant agro-based domestic waste. The properties of MPBP fibers were reported for the first time in this communication. X-ray diffraction analysis showed the crystallinity index and size of 56.71% and 16.38 nm, respectively…