In situ green synthesis of Au/Ag nanostructures on a metal-organic framework surface for photocatalytic reduction of p-nitrophenol

Karanveer Singh,Deepak Kukkar,Ravinder Singh,Preeti Kukkar,Nardev Bajaj,Jagpreet Singh,Mohit Rawat,Akshay Kumar,Ki-Hyun Kim 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.81 No.-

In this manuscript, we report the insitu growth of gold nanoparticles (GNPs) and silver nanoparticles(SNPs) over Ce/Tb-doped Y-benzene tricaroboxylate metal organic frameworks (MOF-76). Thephotocatalytic potential of these nanocomposites (NCs) was then assessed for the photocatalyticreduction of p-nitrophenol (p-NP) in aqueous medium. The NCs had large surface area to favorablyshowcase the efficient absorption of light energy. Correspondingly, it facilitated the electron transferbetween the valance and conduction bands to promote the reductive removal of p-NP. Among the testedcatalysts, GNPs@MOF-76 (Ce) (MOF-76(1a)) (dosage: 10 ml of 5 mg.ml 1) recorded the maximumcatalytic efficiency (96.3%) with an apparent rate constant (K0app: 0.33 min 1). Further, MOF-76 (1a) NCsexhibited good recyclability (e.g., a catalytic efficiency of 77.45% over 3 cycles). Moreover, the proposedNCs exhibited superior performance over commercial photocatalysts (e.g., p25 TiO2 nanopowder)towards p-NP reduction. As such, the results of this experimental study successfully demonstrated thesuperiority of the MOF immobilized nanoparticles (NPs) as an efficient platform for the removal ofindustrial grade pollutants.

Sentiment analysis of demonetization of 500 & 1000 rupee banknotes by Indian government

Prabhsimran Singh,Ravinder Singh Sawhney,Karanjeet Singh Kahlon 한국통신학회 2018 ICT Express Vol.4 No.3

All government policies have a down side and the burden of the down side is often felt only by the common man. This paper considers one such government policy, the demonetization of high denomination currency by the Indian government that took effect midnight on November 8, 2016. In this paper, we have minutely analyzed this government policy from the common person’s perspective by using the concept of sentiment analysis and taking Twitter as a tool. In addition to performing a nation-wide analysis, we have also performed state-wide analysis using geolocation to further elucidate the reasons of displeasure among people of respective states.

Exceptionally stable green-synthesized gold nanoparticles for highly sensitive and selective colorimetric detection of trace metal ions and volatile aromatic compounds

Karanveer Singh,Deepak Kukkar,Ravinder Singh,Preeti Kukkar,김기현 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.68 No.-

The manuscript reports synthesis of exceptionally stable gold nanoparticles (GNPs) using Momordica charantia fruit extract. The synthesis approach was optimized by refining three experimental variables including source of the fruit extract (peel, seed, and seed coat), pH of the solution, and temperature of the reaction medium. As synthesized GNPs showed excellent stability against various thiolated compounds (e.g., thioglycolic acid, thiourea, l-cystine, 1-dodecanethiol, and cysteamine hydrochloride). Moreover, these nanoparticles showed distinctive colorimetric responses against Cd2+ and thiophenol (TP) from their potential interferences. The limit of detection (LOD) values for Cd2+ and TP were determined as 0.186 and 0.154 μM, respectively.

Design of fullerene-based biomarker for detection of lead impurities

Milanpreet Kaur,Ravinder Singh Sawhney,Derick Engles,Rupan Preet Kaur 한국통신학회 2016 ICT Express Vol.2 No.4

The fullerene-based molecular junction in a device configured for sensor applications in medical diagnostics has been evaluated in this study. The presence of highly carcinogenic agents such as lead is detected using this molecular device, which is configured and investigated using extended Hückel theory (EHT) and the non-equilibrium Green’s function. The electrical parameters that we calculated can be employed to determine the concentration of lead impurities by evaluating its transmission coefficients and molecular orbitals. Our results suggests that the alignment of current increases with increasing impurity level (i.e., of 6, 12, and 18 lead atoms), thus indicating sensor characteristics.

Determining the Neurocognitive Status and the Functional Ability of Patients to Screen for HIV-Associated Neurocognitive Disorder (HAND)

Ritika Agarwal,Ravinder Singh Aujla,Amit Gupta,Mukesh Kumar 대한치매학회 2020 Dementia and Neurocognitive Disorders Vol.19 No.1

Background and Purpose: To adequately evaluate the extent of neurocognitive impairment in patient living with human immunodeficiency virus (PLHIV), a battery of neuropsychological tests is typically administered which are neither cost effective nor time efficient in the outpatient clinical setting. The aim of the study was to assess neurocognitive status and functional ability of people living with HIV and find a brief screening tool to identify those who would benefit from a full diagnostic evaluation. Methods: The study enrolled 160 PLHIV (80 pre-antiretroviral therapy [ART] and 80 on ART) fulfilling the inclusion and exclusion criteria. Neurocognitive assessment and an assessment of Functional ability was done by using the Montreal Cognitive Assessment (MoCA) and Lawton and Brody Instrumental Activities of Daily Living Scale scale, respectively. Results: The study population consisted of 75.6% males and 24.4% females with mean age of 44±10 years. The overall prevalence of HIV associated neurocognitive disorder (HAND) in the study subjects was 52.5%. Of these, 47.5% had asymptomatic neurocognitive impairment and 5% had minor neurocognitive disorder. In MoCA, the most frequently affected domains were Language (97.6%), visuospatial ability (92.9%) and memory (71.4%). Conclusions: The prevalence of HAND in both groups were similar suggesting that neurocognitive impairment starts early in HIV infection. Memory and Visuospatial function impairment had the most predictive potential for detecting the presence of HAND. HAND screening is recommended in all PLHIV at enrolment into care. Simple tools like MoCA can be used in busy outpatient settings by healthcare workers to screen for HAND.

Biomarkers of Major Depressive Disorder: Knowing is Half the Battle

Sahil Malik,Ravinder Singh,Govind Arora,Akriti Dangol,Sanjay Goyal 대한정신약물학회 2021 CLINICAL PSYCHOPHARMACOLOGY AND NEUROSCIENCE Vol.19 No.1

Major depressive disorder (MDD) is a heterogeneous disease which is why there are currently no specific methods to accurately test the severity, endophenotype or therapy response. This lack of progress is partly attributed to the complexity and variability of depression, in association with analytical variability of clinical literature and the wide number of theoretically complex biomarkers. The literature accessible, indicates that markers involved in inflammatory, neurotrophic and metabolic processes and components of neurotransmitters and neuroendocrine systems are rather strong indicators to be considered clinically and can be measured through genetic and epigenetic, transcriptomic and proteomic, metabolomics and neuroimaging assessments. Promising biologic systems/markers found were i.e., growth biomarkers, endocrine markers, oxidant stress markers, proteomic and chronic inflammatory markers, are discussed in this review. Several lines of evidence suggest that a portion of MDD is a dopamine agonist-responsive subtype. This review analyzes concise reports on the pathophysiological biomarkers of MDD and therapeutic reactions via peripheral developmental factors, inflammative cytokines, endocrine factors and metabolic markers. Various literatures also support that endocrine and metabolism changes are associated with MDD. Accumulating evidence suggests that at least a portion of MDD patients show characteristics pathological changes regarding different clinical pathological biomarkers. By this review we sum up all the different biomarkers playing an important role in the detection or treatment of the different patients suffering from MDD. The review also gives an overview of different biomarker’s playing a potential role in modulating effect of MDD.

High-performance printed electronics based on inorganic semiconducting nano to chip scale structures

Dahiya Abhishek Singh,Shakthivel Dhayalan,Kumaresan Yogeenth,Zumeit Ayoub,Christou Adamos,Dahiya Ravinder 나노기술연구협의회 2020 Nano Convergence Vol.7 No.33

The Printed Electronics (PE) is expected to revolutionise the way electronics will be manufactured in the future. Building on the achievements of the traditional printing industry, and the recent advances in flexible electronics and digital technologies, PE may even substitute the conventional silicon-based electronics if the performance of printed devices and circuits can be at par with silicon-based devices. In this regard, the inorganic semiconducting materials-based approaches have opened new avenues as printed nano (e.g. nanowires (NWs), nanoribbons (NRs) etc.), micro (e.g. microwires (MWs)) and chip (e.g. ultra-thin chips (UTCs)) scale structures from these materials have been shown to have performances at par with silicon-based electronics. This paper reviews the developments related to inorganic semiconducting materials based high-performance large area PE, particularly using the two routes i.e. Contact Printing (CP) and Transfer Printing (TP). The detailed survey of these technologies for large area PE onto various unconventional substrates (e.g. plastic, paper etc.) is presented along with some examples of electronic devices and circuit developed with printed NWs, NRs and UTCs. Finally, we discuss the opportunities offered by PE, and the technical challenges and viable solutions for the integration of inorganic functional materials into large areas, 3D layouts for high throughput, and industrial-scale manufacturing using printing technologies.

A Token Based Protocol for Mutual Exclusion in Mobile Ad Hoc Networks

( Bharti Sharma ),( Ravinder Singh Bhatia ),( Awadhesh Kumar Singh ) 한국정보처리학회 2014 Journal of information processing systems Vol.10 No.1

Resource sharing is a major advantage of distributed computing. However, a distributed computing system may have some physical or virtual resource that may be accessible by a single process at a time. The mutual exclusion issue is to ensure that no more than one process at a time is allowed to access some shared resource. The article proposes a token-based mutual exclusion algorithm for the clustered mobile ad hoc networks (MANETs). The mechanism that is adapted to handle token passing at the inter-cluster level is different from that at the intra-cluster level. It makes our algorithm message efficient and thus suitable for MANETs. In the interest of efficiency, we implemented a centralized token passing scheme at the intra-cluster level. The centralized schemes are inherently failure prone. Thus, we have presented an intracluster token passing scheme that is able to tolerate a failure. In order to enhance reliability, we applied a distributed token circulation scheme at the inter-cluster level. More importantly, the message complexity of the proposed algorithm is independent of N, which is the total number of nodes in the system. Also, under a heavy load, it turns out to be inversely proportional to n, which is the (average) number of nodes per each cluster. We substantiated our claim with the correctness proof, complexity analysis, and simulation results. In the end, we present a simple approach to make our protocol fault tolerant.

Contemplating charge transport by modeling of DNA nucleobases based nano structures

Rajan Vohra,Ravinder Singh Sawhney,Kunwar Partap Singh 한국물리학회 2020 Current Applied Physics Vol.20 No.5

Electrical charge transport through two basic strands Thymine and Adenine of DNA has been analyzed using jellium model approach. The FFT-2D computations have been performed for semi empirical Extended Huckel Theory using Atomistix Tool kit to contemplate the charge transport metrics like current and conductance. We have scrutinized the behavior of the devices in the range of -2 V–2 V for a step size of 0.2 V. A prominent observation is the drop in HLGs of Adenine and Thymine, when working as device as compared to their intrinsic values and this is comparative more visible in case of Adenine. The current in the thymine based device exhibit linear increase with voltage in spite of having low conductance. Further the broader transmission peaks represent the strong coupling of electrodes to the scattering molecule (Thymine). The NDR effect of Adenine based device for higher bias can be utilized in various future electronics applications.

Graft tunnel integration occurs early in the tibial tunnel compared with the femoral tunnel after anterior cruciate ligament reconstruction with preserved insertion hamstring tendon graft

( Ravi Gupta ),( Sandeep Singh ),( Anil Kapoor ),( Ashwani Soni ),( Ravinder Kaur ),( Narinder Kaur ) 대한슬관절학회 2021 대한슬관절학회지 Vol.33 No.-

Background: Preservation of hamstring tendon insertion at the time of anterior cruciate ligament (ACL) reconstruction is a well-known technique; however, its effect on graft integration is not well studied. The present study was conducted to study the graft integration inside the tibial and femoral tunnels, respectively, after ACL reconstruction using hamstring tendon graft with preserved insertion. Methods: Twenty-five professional athletes who underwent ACL reconstruction using hamstring tendon graft with preserved tibia insertion were enrolled in the study. Functional outcomes were checked at final follow-up using Lysholm score and Tegner activity scale. Magnetic resonance imaging (MRI) was done at 8 months and 14 months follow-up to study the graft tunnel integration of the ACL graft at both tibial and femoral tunnels. Results: The mean Fibrous interzone (FI) score (tibial tunnel) decreased from 2.61 (1-5) at 8 months to 2.04 (1-4) at 14 months follow-up (p = 0.02). The mean FI score (femoral side) decreased from 3.04 (2-5) at 8 months to 2.57 (2-4) at 14 months (p = 0.02). Conclusions: Graft integration occurs early in the tibial tunnel as compared with the femur tunnel with preserved insertion hamstring tendon autograft. Trial registration CTRI/2019/07/020320 [registered on 22/07/2019]; http:// www. ctri. nic. in/ Clini caltr ials/ pdf_ gener ate. php? trial id= 33884 & EncHid= & modid= & compi d=% 27,% 27338 84det% 27