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15 AUG 1947
On 3rd June 1947, Britain announced to renounce its dominion over India. After ruling for almost two hundred years British liberate India in 15th August 1947 and to celebrate this event India Post issued a postage stamp on 21st November 1947. To celebrate and mark this event India Post decided to issues three postage stamps to commemorate the Independence Day of India. -
150 Years of India Post
150 Years of India Post stamp was originally issued on 4 October 2004. The stamp is one among the set of four commemorative stamps, which marks the sesquicentennial year of the department of posts as it rededicates itself to the service of nation. On !st October 1854, India Post was born with a skeletal network of 701 post offices under the control of a Director General. -
1857 First World War of Independence
The stamp was issued to commemorate the 150th anniversary of the first World War of Independence in 2007. It shows the dramatic confrontation between zealous freedom fighters and the stolid ranks of hired Company infantry. -
1st Asian Games 1951
1st Asian Games 1951, a commemorative postage stamp issued by India Post on 4 March, 1951. The first Asian Games were held at New Delhi on 8 to 11 March 1951, when ten nations took part. -
2-(6-Chloro-2,3,4,9-tetrahydro-1H-carbazol-1-yl-idene)propanedinitrile
The molecular conformation of the title compound, C15H 10ClN3, is stabilized by an intramolecular N-H?N hydrogen bond with an S(7) ring motif. The crystal packing is controlled by N-H?N and C-H?N intermolecular interactions. One of the methylene groups of the cyclohexene ring is disordered over two positions with refined occupancies of 0.457 (12) and 0.543 (12). -
2,2,6,6-Tetramethylpiperidinyloxyl (TEMPO) Radical Mediated Electro-Oxidation Reactions: A Review
Over the last few decades, the interest in green and sustainable chemistry has led to the development of different synthetic methodologies which utilize clean reagents. In that direction, the electro-oxidation reactions are considered as one of the most interesting and promising methods. This is predominantly due to their environmentally benign nature, as oxidation can be achieved without the need for commonly used oxidizing agents. 2,2,6,6-Tetramethylpiperidinyloxyl radical commonly known as TEMPO is a stable aminoxyl radical utilized for the oxidation of various classes of alcohols to carbonyl compounds by using cyclic voltammetry. The present review focuses on the various electrochemical reactions utilizing TEMPO as a mediator such as the oxidative conversion of alcohols, carbohydrates, amines, sulphur-containing compounds, and alkenes in both laboratory as well as industrial scales and covers literature from 1950 till present date. The properties, reactivity, and yield percentages of these reactions would provide a basis for better electrocatalyst design in future studies involving TEMPO and its derivatives as mediators. 2021 Wiley-VCH GmbH -
21st Century Teacher Educator
Golden Research Thoughts, Vol. 2, Issue 11, pp. 40-45, ISSN No. 2231-5063 -
2D Materials Coated Flexible Origami for Low-Frequency Energy Harvesting
Wave energy is one of the most abundant energy sources. Triboelectric nanogenerators (TENGs) are becoming more popular for sustainable energy generation from waves. Concerning the renewable energy demands, we focus on developing cost-effective and adaptable origami-TENGs (O-TENGs) for harvesting wave energy, specifically utilizing paper-based (cellulose) materials. An origami-inspired lightweight and scalable design is proposed to create high-performance O-TENGs suitable for the complex conditions of low-frequency wave excitation. The paper-based spring-like O-TENG is coated with two-dimensional (2D) molybdenum disulfide (MoS2) nanosheets and demonstrates efficacy in harvesting mechanical energy in the ambient environment and the output performance compared with reduced graphene oxides (rGO). A detailed density functional theory (DFT) calculation was used to analyze the charge transfer mechanism in the coated origami structures. Furthermore, a barrel-shaped floating generator incorporating multiple origami TENGs is introduced to capture ocean wave energy across various frequencies, amplitudes, and directional movements. Since the coated origami structures show a good self-rebounding spring-like nature and energy harvesting properties, they are suitable for blue energy harvesting. 2025 American Chemical Society. -
2D Metal-based Electrocatalysts: Properties and Applications
Metallic nanostructures with thickness ranging from a single atom up to 100 nanometers fall under the category of 2D metals. The modified electronic band structure due to quantum confinement effects leads to intriguing electrical and electronic properties. Moreover, the properties can be further altered by variations in their shape, thickness, and lateral size. The exceptionally high surface area to volume ratio of 2D metals and stretchability are beneficial in electrocatalysis. The exposed atoms on the outer surface of 2D metals with low coordination numbers, possess unique properties, forming numerous active sites on the surface. As a result, 2D metals demonstrate a high ability towards the activation of small molecules, including O2, H2, CO2, HCOOH, CH3OH, C2H5OH, etc. This exceptional oxidation reactivity enables 2D metals to be excellent electrocatalysts for hydrogen/oxygen evolution reaction (HER/OER), oxygen reduction reaction (ORR), and oxidation of small molecules (formic acid, methanol, and ethanol) for fuel-cell applications. As the localized surface plasmon resonance (SPRs) is sensitive to the size/shape of plasmonic 2D metals, the optical absorption enabled by SPRs offers additional advantages for photo-electrocatalytic processes. The stability of highly active catalytic 2D metals presents a challenge due to the propensity of metal surfaces with high reactivity to undergo oxidation. Recent developments in the synthesis, properties, and applications of 2D metal nanostructures for electrocatalytic processes are discussed. The challenges and opportunities in the electrocatalytic application of 2D metal nanostructures have been summarized. 2025 Ram K. Gupta. -
2D Photonic Crystal Nano Biosensor with IoT Intelligence
Optical biosensors based on photonic crystals (PCs) offer interesting possibilities for the analysis and identification of bioanalytes. PC is a periodically varying artificial dielectric material that determines the propagation of modes present in the structure. Within dielectric media, there are modes that are selected based on structural perturbations. Changes in the refractive index of biological analytes are used to identify biological samples and are therefore used as sensing media in many applications. Because these PC sensors are designed in the nano range, they have excellent selectivity and sensitivity. The PC is ultra-compact and only small amounts of analyte are required for bioanalyte detection. Quantification of bioanalytes and biochemicals is one of the greatest challenges in the medical and diagnostic fields. However, these electronic devices cannot be directly connected to biological analytes, so the most difficult task is to extract the analyte information and convert it into electronic signals. Optical biosensors offer an attractive way to interrogate the content of bioanalytes because they directly convert biological events into electrical signals. It is also called a self-contained integrated physical medium because of its many applications such as food industry, drug delivery, point-of-care diagnostic sensing devices, and environmental monitoring. Based on the analyte placed on the PC sensor, resonant wavelengths are observed and the measurements are stored in a database. Diseases are identified based on the current users cognitive value, and data is transmitted and monitored over the Internet of Things. 2024 Scrivener Publishing LLC. -
3-Sequent achromatic sum of graphs
Three vertices x,y,z in a graph G are said to be 3-sequent if xy and yz are adjacent edges in G. A 3-sequent coloring (3s coloring) is a function ?: V (G) ?{1, 2,...,k} such that if x,y and z are 3-sequent vertices, then either ?(x) = ?(y) or ?(y) = ?(z) (or both). The 3-sequent achromatic number of a graph G, denoted ?3s(G), equals the maximum number of colors that can be used in a coloring of the vertices' of G such that if xy and yz are any two sequent edges in G, then either x or z is colored the same as y. The 3-sequent achromatic sum of a graph G, denoted a'3s(G), is the greatest sum of colors among all proper 3s-coloring that requires ?3s(G) colors. This research initiates the study of 3-sequent achromatic sum and finds the exact values of this parameter for some known graphs. Furthermore, we calculate the a'3s(G) of corona product, Cartesian product of the graphs and some important results have been proved and a comparative study is carried out. 2021 World Scientific Publishing Company. -
3D CNN-Based Classification of Severity in COVID-19 Using CT Images
With the pandemic worldwide due to COVID-19, several detections and diagnostic methods have been in place. One of the standard modes of detection is computed tomography imaging. With the availability of computing resources and powerful GPUs, the analyses of extensive image data have been possible. Our proposed work initially deals with the classification of CT images as normal and infected images, and later, from the infected data, the images are classified based on their severity. The proposed work uses a 3D convolution neural network model to extract all the relevant features from the CT scan images. The results are also compared with the existing state-of-the-art algorithms. The proposed work is evaluated in accuracy, precision, recall, kappa value, and Intersection over Union. The model achieved an overall accuracy of 94.234% and a kappa value of 0.894. 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. -
3D face recognition based on symbolic FDA using SVM classifier with similarity and dissimilarity distance measure
Human face images are the basis not only for person recognition, but for also identifying other attributes like gender, age, ethnicity, and emotional states of a person. Therefore, face is an important biometric identifier in the law enforcement and human-computer interaction (HCI) systems. The 3D human face recognition is emerging as a significant biometric technology. Research interest into 3D face recognition has increased during recent years due to availability of improved 3D acquisition devices and processing algorithms. A 3D face image is represented by 3D meshes or range images which contain depth information. In this paper, the objective is to propose a new 3D face recognition method based on radon transform and symbolic factorial discriminant analysis using KNN and SVM classifier with similarity and dissimilarity measures, which are applied on 3D facial range images. The experimentation is done using three publicly available databases, namely, Bhosphorus, Texas and CASIA 3D face database. The experimental results demonstrate the effectiveness of the proposed method. 2017 World Scientific Publishing Company. -
3D face recognition based on symobolic FDA using SVM classifier with similarity and dissimilarity distance measure /
International Journal of Pattern Recognition and Artificial Intelligence, 31, Issue 4, ISSN: 1793-6381. -
3D face reconstruction techniques: Passive methods
In the recent literature, 3D face reconstruction received wide interest and has become one of the significant areas of research. 3D face reconstruction provides in depth details on geometrics, texture and color of the face, which are utilized in different applications. It supports a multitude of applications, ranging from face recognition and surveillance to medical imaging, gaming, animation, and virtual reality. This paper attempts to consolidate the research works that have happened in the history of 3D face reconstruction. Also, we try to classify the existing methods based on the input for the process. The databases used in the recent works are discussed and the performance evaluation of methods on different databases is analyzed. The challenges addressed in recent studies are mainly focused on the faster reconstruction of 3D Images, improved accuracy of reconstructed images, human pose identification, image reproduction with higher resolution. Researchers have also tried to address occlusion related problems. Passive methods, used by different researchers are analyzed and their effects on different parameters are discussed in this work. Finally, possible future areas for improvement in terms of reconstructions are presented for the benefit of researchers. BEIESP. -
3D Face Reconstruction with Feature Enhancement using Bi-FPN for Forensic Analysis
The representation of facial features in three-dimensional space plays a pivotal role in various applications such as facial recognition, virtual reality, and digital entertainment. However, achieving high-fidelity reconstructions from two-dimensional facial images remains a challenging task, particularly in preserving fine texture details. This research addresses this problem by proposing a novel approach that leverages a combination of advanced techniques, including Resnet, Flame model, Bi-FPN, and a differential render architecture. The primary objective of this study is to enhance texture details in reconstructed 3D facial images. The integration of Bi-FPN (Bi-directional Feature Pyramid Network) enhances feature extraction and fusion across multiple scales, facilitating the preservation of texture details across different regions of the face. The objective is to accurately represent facial features from 2D images in three-dimensional space. By combining these methods, the proposed framework achieves significant improvements in preserving fine texture details and overall facial structure. Experimental results demonstrate the effectiveness of the approach, suggesting its potential for various applications such as virtual try-on and facial animation. 2024 The Authors. -
3D flow and heat transfer of micropolar fluid suspended with mixture of nanoparticles (Ag-CuO/H2O) driven by an exponentially stretching surface
Purpose: The purpose of this paper is to discuss the 3D micropolar hybrid (Ag-CuO/H2O) nanofluid past rapid moving surface, where porous medium has been considered. Design/methodology/approach: The model of problem was represented by highly partial differential equations which were deduced by using suitable approximations (boundary layer). Then, the governing model was converted into five combined ordinary differential equations applying proper similarity transformations. Therefore, the eminent iterative RungeKuttaFehlberg method (RKF45) has been applied to solve the resulting equations. Findings: Higher values of vortex viscosity, spin gradient viscosity and micro-inertia density parameters are reduced in horizontal direction, whereas opposite behaviour is noticed for vertical direction. Originality/value: The work has not been done in the area of hybrid micropolar nanofluid. Hence, this article culminates to probe how to improve the thermal conduction and fluid flow in 3D boundary layer flow of micropolar mixture of nanoparticles driven by rapidly moving plate with convective boundary condition. 2020, Emerald Publishing Limited. -
3D Modelling and Rendering Using Autodesk 3ds Max
This is outlined how to create a 3D custom kitchen design, including how to set up the sources, details, work with managing various modifiers like edit poly, slice, mesh select, turbo smooth, lattice, bend, shell modifier, so to provide the kitchen an authentic appearance. The method materials are fitted to the model output, together with illuminating the environment leveraging Arnold lights that are intended to be utilized with this renderer only. It has features that are optimised for rendering with Arnold. Procedures and methods regarding rendering are indeed specified. The final rendering was made out of several drawings. Our report's intention is to develop a kitchen design that enriches models with materials and ample shapes from standard extended primitive along with the mostly utilization of pro-boolean. Finally, a material editor was used to improve the model. target illumination, too. 2023 IEEE. -
3D painting for fracture treatment /
Patent Number: 202241048127, Applicant: Ramesh Chandra Poonia.
The effect of technological advancements has made an impact on the way medical applications are used in the treatment of fracture. The possibility of medical application and technology has immensely grown, and 3D printing and its applications in medical sciences are much explored and found to be acceptable and applicable financially and technically during recent years. While 3D technology is used in diagnosis, 3D printing technology is useful for making treatment and rehabilitation tools. -
3D painting for fracture treatment /
Patent Number: 202241048127, Applicant: Ramesh Chandra Poonia.
The effect of technological advancements has made an impact on the way medical applications are used in the treatment of fracture. The possibility of medical application and technology has immensely grown, and 3D printing and its applications in medical sciences are much explored and found to be acceptable and applicable financially and technically during recent years. While 3D technology is used in diagnosis, 3D printing technology is useful for making treatment and rehabilitation tools.