Non-destructive evaluation of steel and GFRP reinforced beams using AE and DIC techniques

Gaurav Sharma,Shruti Sharma,Sandeep K. Sharma 국제구조공학회 2021 Structural Engineering and Mechanics, An Int'l Jou Vol.77 No.5

The paper presents an investigation of the widely varying mechanical performance and behaviour of steel and Glass Fibre Reinforced Polymer (GFRP) reinforced concrete beams using non-destructive techniques of Acoustic Emission (AE) and Digital Image Correlation (DIC) under four-point bending. Laboratory experiments are performed on both differently reinforced concrete beams with 0.33%, 0.52% and 1.11% of tension reinforcement against balanced section. The results show that the ultimate load-carrying capacity increases with an increase in tensile reinforcement in both cases. In addition to that, AE waveform parameters of amplitude and number of AE hits successfully correlates and picks up the divergent mechanism of cracking initiation and progression of failure in steel reinforced and GFRP reinforced concrete beams. AE activity is about 20- 30% more in GFRP-RC beams as compared to steel-RC beams. It was primarily due to the lower modulus of elasticity of GFRP bars leading to much larger ductility and deflections as compared to steel-RC beams. Furthermore, AE XY event plots and longitudinal strain profiles using DIC gives an online and real-time visual display of progressive AE activity and strains respectively to efficaciously depict the crack evolution and their advancement in steel-RC and GFRP-RC beams which show a close matching with the micro-and macro-cracks visually observed in the actual beams at various stages of loading.

Moment-Curvature behavior of steel and GFRP reinforced beam using AE and DIC Techniques

Gaurav Sharma,Shruti Sharma,Sandeep K. Sharma 국제구조공학회 2022 Structural Engineering and Mechanics, An Int'l Jou Vol.84 No.2

Using non-destructive Acoustic Emission (AE) and optical Digital Image Correlation (DIC) methods, the momentcurvature behavior of steel and GFRP bars reinforced concrete beams under flexure was explored in this study. In the tension zone, laboratory studies were carried out on steel-RC and GFRP-RC beams with varying percentages of longitudinal reinforcement ratios of 0.33 %, 0.52%, and 1.11%. The distinct mechanism of cracking initiation and fracture progression of failure in steel-RC and GFRP-RC beams were effectively correlated and picked up using AE waveform characteristics of the number of AE hits and their amplitudes, AE energy as well as average frequency and duration. AE XY event plots and longitudinal strain profiles using DIC gives an online and real-time visual display of progressive AE activity and strains respectively to efficaciously depict the crack evolution and their advancement in steel-RC and GFRP-RC beams. They display a close matching with the micro and macro-cracks visually observed in the actual beams at various stages of loading.

An Identity-based Ring Signcryption Scheme: Evaluation for Wireless Sensor Networks

Sharma, Gaurav,Bala, Suman,Verma, Anil K. The Institute of Electronics and Information Engin 2013 IEIE Transactions on Smart Processing & Computing Vol.2 No.2

Wireless Sensor Networks consist of small, inexpensive, low-powered sensor nodes that communicate with each other. To achieve a low communication cost in a resource constrained network, a novel concept of signcryption has been applied for secure communication. Signcryption enables a user to perform a digital signature for providing authenticity and public key encryption for providing message confidentiality simultaneously in a single logical step with a lower cost than that of the sign-then-encrypt approach. Ring signcryption maintains the signer's privacy, which is lacking in normal signcryption schemes. Signcryption can provide confidentiality and authenticity without revealing the user's identity of the ring. This paper presents the security notions and an evaluation of an ID-based ring signcryption scheme for wireless sensor networks. The scheme has been proven to be better than the existing schemes. The proposed scheme was found to be secure against adaptive chosen ciphertext ring attacks (IND-IDRSC-CCA2) and secure against an existential forgery for adaptive chosen message attacks (EF-IDRSC-ACMA). The proposed scheme was found to be more efficient than scheme for Wireless Sensor Networks reported by Qi. et al. based on the running time and energy consumption.

Kinematic Viscosity Prediction of Nanolubricants Employed in Heavy Earth Moving Machinery Using Machine Learning Techniques

Gaurav Sharma,Ankit Kotia,Subrata Kumar Ghosh,Prashant Singh Rana,Seema Bawa,Mohamed Kamal Ahmed Ali 한국정밀공학회 2020 International Journal of Precision Engineering and Vol.21 No.10

Recent researchers widely used nanoparticle additives for improving thermal and rheological properties of machine lubricant. In present study the effect of Al2O3 and CeO2 nanoparticles on transmission oil (SAE30), hydraulic oil (HYDREX100) and gear oil (EP90) of heavy earth moving machinery is investigated. Nano-lubricant samples are prepared in 0.01–4% nanoparticle volume fraction range. Four machine learning techniques namely decision tree (DT), random forest (RF), generalized linear models and neural network (NN) have been used to predict the kinematic viscosity for Al2O3 and CeO2 nanolubricants. Further, multi-criteria decision-making technique named technique for order of preference by similarity to ideal solution have been used to find the best predictive method in each category of the nanolubricants. DT, RF and NN methods are found to be most accurate in kinematic viscosity prediction of transmission oil (R 2 = 0.861), hydraulic oil (R 2 = 0.971) and gear oil (R 2 = 0.973), respectively.

Diversity of Odonata (Insecta) from Dholbaha Dam (Distt.Hoshiarpur) in Punjab Shivalik, India

Gaurav Sharma,P.C. Joshi 한국응용곤충학회 2007 Journal of Asia-Pacific Entomology Vol.10 No.2

Study on the species diversity of the order Odonata was carried out during 2002~2004 at Dholbaha dam, which has a moist deciduous forest surrounding it in district Hoshiarpur, Punjab, India. A total of 30 species belonging to 7 families of order Odonata were recorded during the study period. The family Libellulidae, represented by 18 species was the most dominant followed by Coenagrionidae (6 species), Aeshnidae (2 species) and Calopterygidae, Chlorocyphidae, Euphaeidae and Gomphidae each having 1 species. In terms of total number of individuals, family Libellulidae constituted maximum with 64.36% followed by Coenagrionidae (28.50%), Chlorocyphidae (1.83%), Gomphidae (1.62%), Euphaeidae (1.56%), Calopterygidae (1.38%) and Aeshnidae (0.75%). Pantala flavescens (Fabricius), a migratory species was the most dominant in number of individuals constituting 17.12% of the total. The least dominant species included Anax immaculifrons Rambur (0.38%) and Anax parthenope parthenope (Selys) (0.36%). Shannon-Wiener index of species diversity of Odonata was 2.988 and 3.029 during 2002-2003 and 2003-2004, respectively. Seven new species have also been reported from the Dholbaha dam during this study period thus increasing the total species number of odonates so far recorded from this area from 29 to 36.

Polyacrylamide@Zr(IV) vanadophosphate nanocomposite: Ion exchange properties, antibacterial activity, and photocatalytic behavior

Gaurav Sharma,Amit Kumar,Mu. Naushad,Deepak Pathania,Mika Sillanpaa 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.33 No.-

Polyacrylamide Zr(IV) vanadophosphate (PAM/ZVP) nanocomposite was synthesized via simple sol–gelmethod. The synthesized PAM/ZVP nanocomposite was studied for its ion exchange properties. Thenanocomposite showed higher ion exchange capacity (IEC) compared to its inorganic counterpart Zr(IV)vanadophosphate (ZVP). The nanocomposite was well characterized using various techniques viz.-TEM,SEM, XRD, and FTIR. The PAM/ZVP showed promising photocatalytic nature for degradation of Congo reddye under sunlight. The enhanced dye remediation was observed as material behaved as adsorbent andphotocatalyst simultaneously under coupled conditions in dye removal experiments. Thus, PAM/ZVP is aprobable superior hybrid photo catalyst for dye waste treatment

Preparation, characterization and antimicrobial activity of biopolymer based nanocomposite ion exchanger pectin zirconium(IV) selenotungstophosphate: Application for removal of toxic metals

Gaurav Sharma,Deepak Pathania,Mu. Naushad 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.6

A new bio-polymer based nanocomposite, pectin zirconium(IV) selenotungstophosphate (Pc/ZSWP) wasprepared via sol–gel method. The material was characterized using scanning electron microscopy, X-raydiffraction, transmission electron microscopy and Fourier transform infrared spectroscopy. Distributioncoefficient, thermal stability, elution behavior and pH titrations were investigated to explore the ionexchange behavior of nanocomposite. Pc/ZSWP exhibited higher ion exchange capacity (1.27 meq g-1)than its inorganic counterpart (0.67 meq g-1). To explore environmental applicability of the Pc/ZSWP,binary separation and selective separation of Cu2+ and Th4+ from synthetic mixtures of metal ions wereachieved. Antimicrobial activity of the Pc/ZSWP was also investigated.

Design Goal Based Implementation of Energy Efficient Greek Unicode Reader for Natural Language Processing

Gaurav Verma,Vikas Verma,Divya Sharma,Adesh Kumar,Himanshu Verma,Kartik Kalia 보안공학연구지원센터 2016 International Journal of Smart Home Vol.10 No.3

Unicode font is used in coding system that assign a unique code to every symbol of scripts irrespective of their platform, and language. The Greek Unicoder receives 16-bit hexadecimal code of alphabet. The device has been designed to convert Greek language into different languages that our people could understand. This Unicode reader code has been implemented on 28nm FPGA platform called Kintex-7 FPGA. In this paper we are using frequency scaling technique and Design goal. In this paper power analysis is our main concern and we have studied about the power analysis at different frequencies keeping the temperature constant at 25 degree Celsius and maintaining the constant air flow.

Effectiveness of online versus in-person structured training program on arterial blood gas, electrolytes, and ventilatory management of critically ill patients

Gaurav Jain,Bhavna Gupta,Priyanka Gupta,Sagarika Panda,Sameer Sharma,Shalinee Rao 대한중환자의학회 2021 Acute and Critical Care Vol.36 No.1

Background: Due to the risk of viral transmission during in-person training, a shift towardonline platforms is imperative in the current pandemic. Therefore, we compared the effectivenessof an in-person interactive course with a structurally similar online course designedto improve cognitive skills among clinical health professionals in arterial blood gas analysis,management of electrolyte imbalances, and approaches to mechanical ventilation in criticallyill patients. Methods: In an observational, outcome assessor-blinded, cohort trial, group A included participantsenrolled prospectively in an online course, while group B included those who tookpart in an in-person course (retrospective arm). The primary objective was comparison ofcognitive skills through a pre and post-test questionnaire. Statistical analysis was performedusing Student t-test. Results: In total, 435 participants were analyzed in group A, while 99 participants were evaluatedin group B. The mean pre-test score was 9.48±2.75 and 10.76±2.42, while the meanpost-test score was 11.94±1.90 (passing rate, 64.6%) and 12.53±1.63 (passing rate, 73.3%)in groups A and B, respectively. Group B scored significantly higher in both pre-test (P=0.001)and post-test evaluations (P=0.004). The improvement in post-test score was significantlygreater (P=0.001) in group A (2.46±2.22) compared to group B (1.77±1.76). The medicalspecialties fared better in group B, while surgical specialties scored higher in group A. Thepre-test vs. post-test scores exhibited a moderate correlation in both groups (P<0.001). Thefeedback survey showed a Likert score >3.5 for most points in both groups. Conclusions: The online teaching module exhibited a significant benefit in terms of participantsensitization and knowledge sharing.

A Comparative Study of AA6351 Mono-Composites Reinforced with Synthetic and Agro Waste Reinforcement

Gaurav Arora,Satpal Sharma 한국정밀공학회 2018 International Journal of Precision Engineering and Vol.19 No.4

The use of industrial-agro wastes as reinforcements in the development of composites can be considered as a new inclination in the field of material research. The present investigation involves the development of AA6351 mono-composites with various weight percentages (2wt.%, 4wt.%, 6wt.% and 8wt.%) of silicon carbide (SiC) and rice husk ash (RHA) as reinforcement using stir casting technique. The physical, microstructural, mechanical and tribolological behaviour of the developed composites were examined for the both type of the composites. An increase of 1.08% in density, 37% in hardness and 39% in tensile strength was recorded for the composites developed with silicon carbide as reinforcement and a decrease in density of 3.9%, an improvement of 16% in hardness and 21% in tensile strength was indicated for the composites reinforced with rice husk ash as reinforcement. The results also revealed a uniform distribution of the reinforcement and improved wear resistance for the both set of the composites. The characterization results exhibited that even the performance of the composites with SiC as reinforcement is better than the performance of the composites with RHA as reinforcement but RHA can be suitably applied as reinforcement for the development of low density AA6351/RHA green composites.