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Rajpoot Sharad Chandra,Pandey Chanki,Rajpoot Prashant Singh,Singhai Sanjay Kumar,Sethy Prabira Kumar 대한전기학회 2021 Journal of Electrical Engineering & Technology Vol.16 No.4
This paper proposes a SUGPDS model based on Detection and Isolation algorithm and smart sensors, namely micro phasor measurement unit, smart sensing and switching device, phasor data concentrator, and ZigBee technology, etc. for the identifi cation, classifi cation, and isolation of the various fault occurs in the underground power cable in the distribution system. The proposed SUGPDS is a quick and smart tool in supervising, managing, and controlling various faults and issues and maintaining the reliability, stability, and uninterrupted fl ow of electricity. First, the SUGPDS model is analyzed using a distributed parameter approach. Then, the proper arrangement of the system required for the implantation of SUGPDS is demonstrated using fi gures. The Phasor data concentrator plays an essential role in developing the detection and classifi cation report for identifi cation and classifi cation. Finally, smart sensing and switching device installed at a diff erent location isolated the faulty phase from a healthy network. This approach helps to decrease power consumption. Hence, SUGPDS has super abilities compared to the underground power distribution system. The eff ectiveness of the proposed method and model is demonstrated via fi gures and tables
Thakur Sudesh Kumar Raunija,Sharad Chandra Sharma 한국탄소학회 2015 Carbon Letters Vol.16 No.1
The prime objective of this research was to study the influence of hot-pressing pressure and matrix-to-reinforcement ratio on the densification of short-carbon-fiber-reinforced, randomly oriented carbon/carbon-composite. Secondary objectives included determination of the physical and mechanical properties of the resulting composite. The ‘hybrid carbon-fiberreinforced mesophase-pitch-derived carbon-matrix’ composite was fabricated by hot pressing. During hot pressing, pressure was varied from 5 to 20 MPa, and reinforcement wt% from 30 to 70. Densification of all the compacts was carried at low impregnation pressure with phenolic resin. The effect of the impregnation cycles was determined using measurements of microstructure and density. The results showed that effective densification strongly depended on the hot-pressing pressure and reinforcement wt%. Furthermore, results showed that compacts processed at lower hot-pressing pressure, and at higher reinforcement wt%, gained density gradually during three densification cycles and showed the symptoms of further gains with additional densification cycles. In contrast, samples that were hot-pressed at moderate pressure and at moderate reinforcement wt%, achieved maximum density within three densification cycles. Furthermore, examination of microstructure revealed the formation of cracks in samples processed at lower pressure and with low reinforcement wt%.
Rajiv Bharat Kharwar,Sharad Chandra,Sudhanshu Kumar Dwivedi,Ram Kirti Saran 한국심초음파학회 2014 Journal of Cardiovascular Imaging (J Cardiovasc Im Vol.22 No.3
Peripartum cardiomyopathy is a cardiac condition characterized by development of heart failure during the last month of pregnancyor during the first five months of post partum period without any other identifiable cause of heart failure. The hypercoagulablestate in the pregnancy along with left ventricular (LV) systolic dysfunction predisposes the patient to thromboembolic complicationslike intraventricular thrombi. We report a case of a 30-year-old female with peripartum cardiomyopathy along with ahighly mobile mass in the LV cavity on two dimensional echocardiography. Three dimensional transthoracic echocardiographyclearly showed the pedicle of the mass attached to the interventricular septum along with internal echolucent areas within themass. Due to denial of the patient to undergo surgery, she was started on oral anticoagulation, with complete dissolution of themass within one month.
Thakur Sudesh Kumar Raunija,Sharad Chandra Sharma,Anil Verma 한국탄소학회 2016 Carbon Letters Vol.19 No.-
Isroaniso matrix precursor synthesized from commercially available petroleum pitch was stabilized in air. The influence of oxygen mass gain during stabilization on the yield of matrix precursor was studied. Additionally, the influence of pressure on the yield of the stabilized matrix precursor in a real system was studied. The fourier transform infrared spectrometry (FTIR), thermogravimetric analysis (TGA), yield, yield rate, and yield impact were used to check the effect of stabilization and pressure on the yield of the matrix precursor and the end properties of the composite thereafter. The results showed that the yield increased with stabilization duration up to 20 h whereas it decreased for stabilization duration beyond 20 h. Further results showed that the stabilized matrix precursor for a duration of 5 h could withstand almost two-fold greater hot-pressing pressure without resulting in exudation as compared to that of a 1 h stabilized matrix precursor. The enhanced hot-pressing pressure significantly improved the yield of the matrix precursor. As a consequence, the densification and mechanical properties were increased significantly. Further, the matrix precursor stabilized for a duration of 20 h or more failed to provide proper and uniform binding of the reinforcement.
Raunija, Thakur Sudesh Kumar,Mathew, Mariamma,Sharma, Sharad Chandra 한국탄소학회 2014 Carbon Letters Vol.15 No.3
This study highlights a novel method and mechanism for the rapid and effective milling of carbon fibers (CFs) in silicon carbide (SiC) powder, and also the dispersion of CFs in SiC powder. The composite powders were prepared by chopping and exfoliation of CFs, and ball milling of CFs and SiC powder in isopropyl alcohol. A wide range of CFs loading, from 10 to 50 vol%, was studied. The milling of CFs and SiC powder was checked by measuring the average particle size of the composite powders. The dispersivity of CFs in SiC powder was checked through scanning electron microscope. The results show that the usage of exfoliated CF tows resulted in a rapid and effective milling of CFs and SiC powder. The results further show an excellent dispersion of CFs in SiC powder for all CFs loading without any dispersing agent.