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Kumar, Yogesh,Gupta, Ankit,Tounsi, Abdelouahed Techno-Press 2021 Advances in nano research Vol.11 No.1
In the present paper, a refined trigonometric higher-order shear deformation theory has been presented with the conjunction of nonlocal theory for the vibrational response of functionally graded (FG) porous nanoplate. The displacement field is chosen based on assumptions that the out of the plane displacement consists of bending and shear components whereas the transverse shear-strain has nonlinear variation along the thickness direction. The number of unknown variables is four, as against five in other renowned shear deformation theories. The governing equations have been derived using Hamilton's principle. A generalized porosity model has also been developed to accommodate both even and uneven type of distribution of porosity in the FG nanoplates. The closed-form solution of simply-supported FG porous nanoplates is obtained and the results are compared with the available reported results. In finite element solution, a C<sup>0</sup> continuous isoparametric quadrilateral element has been used with various conventional and unconventional boundary conditions. The effects of various parameters like small-scale effect, aspect ratio, volume fraction index, porosity volume fraction, and thickness ratio have been investigated. The significant influence of small-scale effects and porosity inclusions have been observed in the reported results. It has been reported that both closed-form and finite element solutions with the present theory can make accurate predictions of the free vibration response.
High Temperature Stress Tolerance in Maize (Zea mays L.): Physiological and Molecular Mechanisms
Yogesh Kumar Tiwari,Sushil Kumar Yadav 한국식물학회 2019 Journal of Plant Biology Vol.62 No.2
Maize, third most important staple cereal crop acrossthe globe, has been threatened with different environmentalconstraints including heat and water deficit stress. Higherenvironmental temperatures negatively affect the most atanthesis, silking and grain filling reproductive phenophases. The situation is further complicated by the variable climaticevents, resulting in gradual and sometimes sudden increasein environmental temperature followed by irregular rainfrequency and intensity, and thus posing a serious threat toglobal food security. To meet the ever increasing fooddemand there is an urgent need to develop climate resilientmaize varieties and the goal can be achieved by exploitingthe pertinent physiological, biochemical and molecularmechanisms. By introducing certain modifications, togetherthese mechanisms can help us to combat the negative impactof high temperature stress. This review encompasses manyof such physiological and molecular approaches which mayhelp in mitigating the adverse effects of heat stress on maizeyield. Molecular, biochemical and physiological knowledgeavailable in domain that may be employed in breedingapproaches to develop heat tolerant maize genotypes, hasthoroughly been discussed.
Clinical spectrum of elderly-onset inflammatory bowel disease in India
Yogesh Kumar Gupta,Arshdeep Singh,Vikram Narang,Vandana Midha,Ramit Mahajan,Varun Mehta,Dharmatma Singh,Namita Bansal,Madeline Vithya Barnaba Durairaj,Amit Kumar Dutta,Ajit Sood 대한장연구학회 2023 Intestinal Research Vol.21 No.2
Background/Aims: Inflammatory bowel disease (IBD) is increasingly being recognized in elderly patients. Data on clinical spectrum of elderly-onset IBD patients is lacking from India. Methods: A cross-sectional retrospective analysis of a prospectively maintained database of patients diagnosed with IBD was conducted at 2 centers in India. The clinical spectrum of elderly-onset IBD including demographic profile (age and sex), clinical presentation, disease characteristics (disease behavior and severity, extent of disease), and treatment were recorded and compared with adult-onset IBD. Results: During the study period, 3,922 (3,172 ulcerative colitis [UC] and 750 Crohn’s disease [CD]) patients with IBD were recorded in the database. A total of 186 patients (4.74%; 116 males [62.36%]) had elderly-onset IBD (69.35% UC and 30.64% CD). Diarrhea, blood in stools, nocturnal frequency and pain abdomen were the commonest presentations for UC, whereas pain abdomen, weight loss and diarrhea were the most frequent symptoms in CD. For both elderly onset UC and CD, majority of the patients had moderately severe disease. Left-sided colitis was the commonest disease location in UC. Isolated ileal disease and inflammatory behavior were the most common disease location and behavior, respectively in CD. 5-Aminosalicylates were the commonest prescribed drug for both elderly onset UC and CD. Thiopurines and biologics were used infrequently. Prevalence of colorectal cancer was higher in elderly onset IBD. Conclusions: Elderly onset IBD is not uncommon in India. Both the elderly onset UC and CD were milder, with no significant differences in disease characteristics (disease extent, location and behavior) when compared to adult-onset IBD. Colorectal cancer was more common in elderly onset IBD.
Photoanode modified with nanostructures for efficiency enhancement in DSSC: a review
Yogesh Kumar,Tushar Chhalodia,Paramjeet Kaur Gumber Bedi,P. L. Meena 한국탄소학회 2023 Carbon Letters Vol.33 No.1
The research on dye-sensitized solar cells (DSSCs) is in the advanced stage today. The only concern observed so far has been regarding its stability and efficiency. Its power conversion efficiency can be increased by incorporating various methods and materials based on nanotechnology. Several attempts have been employed to develop advanced methods for eco-friendly, commercially viable, and sustainable DSSCs to minimize the energy crisis in the future. Photoanode is one of the essential components of DSSCs that can be modified using different nanostructures to enhance its efficiency. The TiO2 nanoparticlebased photoanode with gold and silver has proven to be potent materials for getting efficient DSSCs. The plasmonic and quantum confinement effects also play a vital role in efficiency enhancement. In this review, we discuss numerous attempts made by researchers in the last decade to modify the photoanode and their progress. We also look at different types of nanostructures, such as quantum dots, metal oxide doping, layered structures, nanocomposites, and thin film formation, that improve the efficiency of DSSCs. Several methods were reviewed to modify photoanodes to optimize electron transportation, light scattering, trapping power, surface area, and reduce charge recombination. The trend in the efficiency enhancement of DSSCs using TiO2, Au, ZnO, Ag, and graphene nanostructures-based photoanodes have been explored in great detail.
Kumar, Yogesh,Sharma, Pranav,Bhatt, Neeraj,Hooda, Kusum Asian Pacific Journal of Cancer Prevention 2016 Asian Pacific journal of cancer prevention Vol.17 No.2
Hepatocellular cancer is a very common cause of cancer related deaths worldwide. Only 30-40% of patients present with early-stage disease open to curative treatments, such as resection or transplantation, while others can only undergo local therapies or palliative care. Various trans-arterial approaches have been used for treatment of hepatocellular carcinoma in patients who need a down-staging to liver transplantation, and who are not candidates for transplantation or radiofrequency ablation. Transarterial chemoembolization (TACE), transarterial embolization (TAE), drug-eluting beads, and radioembolization have been used for locoregional control, and have been shown to prolong the overall survival when compared with supportive care. In this review, we discuss patient selection, pre- and post-procedure imaging, techniques, safety, and clinical outcomes related to these therapies. Newer advances with future directions in various fields related to trans-arterial therapies are also discussed.
Can Good Economic Relations Change Bad Political Relations Between India And China?
( Yogesh Kumar Gupta ) 인천대학교 사회과학연구원 2015 사회과학연구 Vol.7 No.-
India and China are among the leading economies of the world. Both nations are part of the BRICS- an acronym used for a group of fast growing economies as described by Goldman Sachs. They share a long territorial border and are home to ancient civilizations. However, political relations between them have often been troubled due to various contentious issues. In the latter part of the twentieth century India and China opted for increasing economic ties and their bilateral trade has grown many-fold in the last decade. The post Cold-War period has seen an especially swift turn around as far as the economies of these two nations is concerned. The continuous increase in their defense acquisitions has also complimented their financial growth resulting in changes in their international roles. Many theorists, therefore, have defined China and India as alternate poles of power. However, there are constraints and problems. For example, India still has unresolved territorial and other disputes with China, along with the challenges it is facing on the domestic front. China, on the other hand, cannot remain economically capitalist and politically communist. This paradox needs to be considered as well. There is the obvious question of whether better economic ties can change bad political relations between them. This paper seeks an answer to this question.