Synergistic effect of polypyrrole/BST/RGO/Fe3O4 composite for enhanced microwave absorption and EMI shielding in X-Band

Pradeep Sambyal,S.K. Dhawan,Preeti Gairola,Sampat Singh Chauhan,S.P. Gairola 한국물리학회 2018 Current Applied Physics Vol.18 No.5

Present study focus on the designing of high performance microwave absorbing material against electromagnetic pollution. Herein we synthesize conducting polymer based composite encapsulated with Barium strontium titanate (BST), reduced graphene oxide (RGO), and Fe3O4 nanoparticles via chemical oxidative polymerization of pyrrole. The synthesized composite materials were thoroughly characterized using SEM, FTIR, XRD, TGA, and VSM techniques. The presence of filler materials in conducting polymer matrix leads to absorption dominated shielding effectiveness value of 48 dB in the frequency range of 8.2–12.4 GHz (X-band). Moreover, presence of dielectric and magnetic fillers increases the thermal and chemical stability of the composite material. The obtained shielding effectiveness value is above the recommended limit (30–40 dB) required for the commercial applications, therefore these composite material could be used as effective shield against EM pollution.

Developing an Integrated Acupuncture Protocol for Treating Medial Tibial Stress Syndrome: A Delphi Consensus Study

Pradeep M.K. Nair,Gita Sharma,Deepika Singh,Mamta Jagwani,Anu Alias,Hassan Kodandarama Gurudatta,Radhakrishnan Shubha,Sreedhar Pulipatti,Nagaraja Nagajyothi,Anjali Sharma,Janak Bahadur Basnet,Kalpana 대한침구의학회 2024 대한침구의학회지 Vol.41 No.-

The present study employs the Delphi method to devise a consensus-based protocol for utilizing integrated acupuncture in treating medial tibial stress syndrome (MTSS). Twenty acupuncture experts contributed opinions across six key themes, including diagnosis, acupuncture points, additional Traditional Oriental Medicine modalities, treatment rationale, treatment duration/frequency, and integration of yoga/naturopathic therapies. Consensus, defined as a 70% agreement or higher, was reached on all themes, reflecting a collective acknowledgment of the necessity for a holistic approach to MTSS management. The final protocol includes six diagnostic criteria, six acupuncture points, one additional modality, two Traditional Oriental Medicine therapies, four treatment rationales, and six yoga/naturopathic therapies. The present comprehensive protocol offers valuable guidance for healthcare professionals seeking an integrated approach to MTSS management.

Endoscopic Ultrasound-Guided Random Omental Fine Needle Aspiration: A Novel Technique for the Diagnosis of Peritoneal Carcinomatosis

Pradeep Kumar Siddappa,Neha Jain,Naveen K. Agarwal,Monika Jain,Gurwant Singh Lamba 대한소화기내시경학회 2020 Clinical Endoscopy Vol.53 No.5

Background/Aims: Diagnostic abdominal paracentesis has been described in literature to have variable sensitivity of 50%–75% forthe detection of peritoneal carcinomatosis (PC). We believe that random needle aspirates from the omentum, even in the absence ofobvious deposits by endoscopic ultrasound (EUS), could prove malignancy in patients with PC. Methods: Consecutive patients who underwent EUS for diagnosis and staging of cancer and found to have ascites were includedafter obtaining informed consent. EUS-guided fine needle aspiration (EUS-FNA) from random sites in the omentum was performedthrough the transgastric route using a linear echoendoscope. Results: Fifty-four patients underwent EUS during October 2015 to April 2017 for detection, staging, or FNA of a suspectedmalignant lesion. Ascites was seen in 17 patients and 15 patients who fulfilled the criteria were included. The procedure wassuccessful in all patients. Cytology was suggestive of malignancy in 12 (80%) but not suggestive of malignancy in 3 (20%) patients. Three patients who tested negative had hyperbilirubinemia with biliary obstruction. Their ascitic fluid analysis result was alsonegative. Conclusions: Random FNA of the omentum in patients with malignancy-related ascites is highly effective in the diagnosis of PC andcould be employed during EUS evaluation of malignancies.

Effect of number of blades in ducted turbine system on kinetic energy extraction from chimney flue gases – benchmarking with wind energy system

Harjeet S. Mann,Pradeep K. Singh 대한기계학회 2018 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.32 No.11

A multi-blade ducted wind turbine, also called the diffuser augmented wind turbine (DAWT) has a good wind energy conversion effect over the traditional wind turbine. The market potential for energy recovery from the chimney flue gases made it necessary to explore the possibility of extraction of the energy from flue gases using the DAWT. The duct is a converging-diverging nozzle with the turbineblades located at the throat. In general 3 or more number of blades is frequently used to maximize the energy conversion to the bladetorque. The effect of number of blades on the power extraction by the energy recovery ducted turbine has been studied in this paper. A CFD-based simulation study has been carried out. The results so obtained have been benchmarked with the published data for the results for the ducted turbines for wind power generation. The general airfoil NACA4420, NACA4416 and NACA4412 were adopted to produce various composite profiles for turbine-blade. The large number of blades appears to provide the sufficient blade areas for the conversion of energy of flue gases to the turbine-rotor torque. On other hand the more number of blades also increases the blockage to the flue gases, resulting in increased back-flow. This paper presents the variation of power coefficient (C P ) and torque coefficient (C T ) with respect to the tip speed ratio (λ) for different number of blades, and varying blade geometry.

A novel approach for prediction of surface roughness in turning of EN353 steel by RVR-PSO using selected features of VMD along with cutting parameters

Vikrant Guleria,Vivek Kumar,Pradeep K. Singh 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.6

The abrupt changes in tool-workpiece interaction during machining process induce variation in the surface quality of work material. These interactions include built-up edge formation and their break-off, environmental conditions (use of coolant, rise of temperature etc.), material imperfections, improper structural fitness of machine & tool components, etc. This study presents prediction of surface roughness in turning of EN353 steel implementing the variational mode decomposition (VMD) for processing the vibration data, followed by estimation of the surface roughness using the relevance vector regression (RVR) optimized by particle swarm optimization (PSO). The raw vibration data has been decomposed in five discrete sets of frequency components known as variational mode functions (VMFs). A set of twenty-one statistical features in each three axes have been extracted for raw data and each VMF. The RVR has been trained using these 21×3 = 63 features and 3 cutting parameters – cutting speed, feed depth of cut. The RVR has also been trained separately using top 5 features selected through RreliefF algorithm. The optimal decomposition level has been determined to minimize the noise and predict the surface finish accurately. The results obtained in 1st VMF (high frequency, low amplitude) using its top 5 features for prediction have been found to be reliable with higher prediction accuracy.

An improved surface roughness prediction model using Box-Cox transformation with RSM in end milling of EN 353

Bhuvnesh Bhardwaj,Rajesh Kumar,Pradeep K. Singh 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.12

In the present work, an attempt has been made to use Box-Cox transformation with response surface methodology to develop improvesurface roughness prediction model in end milling of EN 353 steel using carbide inserts. The analysis has been carried out in two stages. In the first stage quadratic model has been developed in terms of feed, speed, depth of cut and nose radius using response surface methodology(RSM) based on center composite rotatable design (CCRD). The quadratic model, thus developed predicts the surface roughnesswith 92% accuracy. In the second stage, the improved quadratic model has been developed using Box-Cox transformation with RSMbased on CCRD. The prediction ability of this develop model has been found more accurate (mean absolute error 4.7%) than previousone. An attempt has also been made to investigate the influence of cutting parameters on surface roughness. The result shows that themachining speed is the main influencing factor on the surface roughness while the depth of cut has no significant influence.

Role of Decompression in Late Presentation of Cervical Spinal Cord Disorders

Sandeep Shrivastava,Harshal Sakale,Rajesh Dulani,Pradeep K Singh,Manoj Sanrakhia 대한척추외과학회 2014 Asian Spine Journal Vol.8 No.2

Study Design: Prospective study conducted at Jawaharlal Nehru Medical College, Datta Meghe Institute of Medical Sciences, Wardha, India. Purpose: To show the efficacy of decompression in the late presentation of cervical spinal cord disorders. Overview of Literature: Studies by various authors have shown that early spinal decompression results in better neurological outcomes. Methods: From January 2003 to January 2005, 11 of the 41 patients with cervical spinal cord compression, meeting the inclusion criteria, underwent anterior decompression; interbody graft placement and stabilization by anterior cervical locking plate. The neurologic and functional outcomes were recorded. Results: Five patients had spinal cord injury and 6 patients had compressive cervical myelopathy. Complications included 1 death and 1 plate loosening. No patient lost their preoperative neurological status. One patient had no improvement, 2 patients showed full recovery. The mean follow-up is 28.3 month. At the of rehabilitation, 6 were able to walk without support), 2 could walk with support, and 1 needed a wheelchair. The average American Spinal Injury Association motor score on admission to the hospital, 32.8 (standard deviation [SD], 30.5); admission to rehabilitation, 38.6 (SD, 32.4); discharge from rehabilitation, 46.2 (SD, 33.7). The most recent follow-up was 64.0 (SD, 35.3). Conclusions: The anterior approach for cervical decompression allows for adequate decompression. This decompression is the best chance offered in even late reported cases, including posttraumatic cases where there is no evidence of cord transactions. The use of anterior cervical plates reduces the chances of graft loosening, extruding, or collapsing.

Seroprevalence of antibodies to SARS-CoV-2 and predictors of seropositivity among employees of a teaching hospital in New Delhi, India

Pragya Sharma,Rohit Chawla,Ritika Bakshi,Sonal Saxena,Saurav Basu,Pradeep Kumar Bharti,Meera Dhuria,S. K. Singh,Panna Lal 질병관리본부 2021 Osong Public Health and Research Persptectives Vol.12 No.2

Objectives: Healthcare workers (HCWs) are at a high risk of contracting severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) due to the increased likelihood of clinical exposure during patient management. The study objective was to determine the seroprevalence of antibodies to SARS-CoV-2 and its predictors among hospital employees. Methods: The cross-sectional study was conducted at a teaching hospital from August 2020 to September 2020 among 1,401 employees, including 1,217 HCWs, in New Delhi, India. The serum samples were examined for immunoglobulin G (IgG) antibodies to SARS-CoV-2 using the COVID Kavach-Anti-SARS-CoV-2 IgG Antibody Detection enzyme-linked immunosorbent assay kit. Data were collected electronically using the EpiCollect mobile platform. A p<0.05 was considered to indicate statistical significance. Results: A total of 169 participants (12.1%) had detectable IgG antibodies to SARS-CoV-2. The highest seropositivity rate was observed in the administrative staff (20.1%), while it was lowest among medical doctors (5.5%, p<0.001). Male sex and ever having lived in a containment zone were independently associated with past infection with SARS-CoV-2. Conclusion: The seroprevalence of SARS-CoV-2 infection in health workers may be lower than in the general population in New Delhi. However, nonpharmaceutical interventions were not associated with a reduction in the risk of acquisition of SARS-CoV-2.