PRESERVING FRESHNESS AND CONTINUITY IN REMOTE BIOMETRIC AUTHENTICATION

Master'sMASTER OF SCIENC

ANTI-ULCER ACTIVITY OF HYDROALCOHOLIC EXTRACT OF PIPER BETLE LEAF ON EXPERIMENTAL ANIMALS

Objective: The main objective of this study is to establish the anti-ulcer activity of hydroalcoholic extract of Piper betle leaf on experimental animals based on previously existing aspects such as antioxidant, antihistaminic, and antimicrobial properties of P. betle leaf. Methods: The leaves were collected, shed dried, and extracted by the Soxhlet apparatus using 70% ethanol. The anti-ulcer activity of the extract was evaluated in albino Wistar rats employing pyloric ligation and stress-induced antiulcer models. Ranitidine was served as a standard drug in both the models. The significance of activity was assessed using a one-way analysis of variance followed by Dunnett’s post-parametric test. Results: In the pyloric ligation model, the untreated control has shown 4.3 mEq/l of acidity, whereas the ranitidine-treated standard group shown 2 mEq/l and P. betle has shown 2.5 mEq/l acidity, respectively. In the stress-induced antiulcer model, the activity was more prominent, in the untreated control, there was 26 number of sores present, whereas the standard group showed only one number of ulcer sore, and in the P. betle treated group, there was four number of ulcer sores present. Conclusion: In the present study, P. betle exhibited potent antiulcer potential while compared with the untreated control and the activity is comparable with standard ranitidine. From the above findings, it can correlate the use of betel leaf as a digesting or gastroprotective agent

Complexity and quenches in models with three and four spin interactions

We study information theoretic quantities in models with three and four spin interactions. These models show distinctive characteristics compared to their nearest neighbour counterparts. Here, we quantify these in terms of the Nielsen complexity in static and quench scenarios, the Fubini-Study complexity, and the entanglement entropy. The models that we study have a rich phase structure, and we show how the difference in the nature of phase transitions in these, compared to ones with nearest neighbour interactions, result in different behaviour of information theoretic quantities, from ones known in the literature. For example, the derivative of the Nielsen complexity does not diverge but shows a discontinuity near continuous phase transitions, and the Fubini-Study complexity may be regular and continuous across such transitions. The entanglement entropy shows a novel discontinuity both at first and second order quantum phase transitions. We also study multiple quench scenarios in these models and contrast these with quenches in the transverse XY model.Comment: 12 Pages, 11 Figure

Complexity in two-point measurement schemes

We show that the characteristic function of the probability distribution associated with the change of an observable in a two-point measurement protocol with a perturbation can be written as an auto-correlation function between an initial state and a certain unitary evolved state by an effective unitary operator. Using this identification, we probe how the evolved state spreads in the corresponding conjugate space, by defining a notion of the complexity of the spread of this evolved state. For a sudden quench scenario, where the parameters of an initial Hamiltonian (taken as the observable measured in the two-point measurement protocol) are suddenly changed to a new set of values, we first obtain the corresponding Krylov basis vectors and the associated Lanczos coefficients for an initial pure state, and obtain the spread complexity. Interestingly, we find that in such a protocol, the Lanczos coefficients can be related to various cost functions used in the geometric formulation of circuit complexity, for example the one used to define Fubini-Study complexity. We illustrate the evolution of spread complexity both analytically, by using Lie algebraic techniques, and by performing numerical computations. This is done for cases when the Hamiltonian before and after the quench are taken as different combinations of chaotic and integrable spin chains. We show that the complexity saturates for large values of the parameter only when the pre-quench Hamiltonian is chaotic. Further, in these examples we also discuss the important role played by the initial state which is determined by the time-evolved perturbation operator.Comment: 16 Pages, 6 Figure

Time evolution of spread complexity and statistics of work done in quantum quenches

We relate the probability distribution of the work done on a statistical system under a sudden quench to the Lanczos coefficients corresponding to evolution under the post-quench Hamiltonian. Using the general relation between the moments and the cumulants of the probability distribution, we show that the Lanczos coefficients can be identified with physical quantities associated with the distribution, e.g., the average work done on the system, its variance, as well as the higher order cumulants. In a sense this gives an interpretation of the Lanczos coefficients in terms of experimentally measurable quantities. We illustrate these relations with two examples. The first one involves quench done on a harmonic chain with periodic boundary conditions and with nearest neighbour interactions. As a second example, we consider mass quench in a free bosonic field theory in $d$ spatial dimensions in the limit of large system size. In both cases, we find out the time evolution of the spread complexity after the quench, and relate the Lanczos coefficients with the cumulants of the distribution of the work done on the system.Comment: 12 Pages, 1 Figur

FOTOC complexity in an extended Lipkin-Meshkov-Glick model

We study fidelity out-of-time-order correlators (FOTOCs) in an extended Lipkin-Meshkov-Glick model and demonstrate that these exhibit distinctive behaviour at quantum phase transitions in both the ground and the excited states. We show that the dynamics of the FOTOC have different behaviour in the symmetric and broken-symmetry phases, and as one approaches phase transition. If we rescale the FOTOC operator with time, then for small times, we establish that it is identical to the Loschmidt echo. We also compute the Nielsen complexity of the FOTOC operator in both phases, and apply this operator on the ground and excited states to obtain the quasi-scrambled state of the model. The FOTOC operator introduces a small perturbation on the original ground and excited states. For this perturbed state, we compute the quantum information metric to first order in perturbation, in the thermodynamic limit. We find that the associated Ricci scalar diverges at the phase transition on the broken-symmetry phase side, in contrast to the zeroth order result. Finally, we comment upon the Fubini-Study complexity in this model.Comment: Minor corrections. 10 Pages, 5 Figure

Immune reconstitution inflammatory syndrome associated with acquired immunodeficiency syndrome-related gastrointestinal limited Kaposi's sarcoma presenting as acute intestinal obstruction: a case report

<p>Abstract</p> <p>Introduction</p> <p>Immune reconstitution inflammatory syndrome during anti-retroviral treatment of acquired immunodeficiency syndrome (AIDS) -associated gastrointestinal Kaposi's sarcoma has rarely been reported.</p> <p>Case Presentation</p> <p>A 36-year-old Asian Indian male, newly diagnosed with AIDS and treatment naïve, was started on highly active antiretroviral therapy (HAART). He developed acute intestinal obstruction after four weeks of therapy. A laparotomy was done with excision and adhesiolysis leading to relief of symptoms. A histology report revealed the lesion to be Kaposi's sarcoma. Our patient was diagnosed to be having immune reconstitution inflammatory syndrome associated with AIDS-associated gastrointestinal limited Kaposi's sarcoma, which presented as acute intestinal obstruction. Our patient was treated with paclitaxel post-operatively and HAART was continued. Our patient responded to therapy.</p> <p>Conclusion</p> <p>Immune reconstitution inflammatory syndrome involving Kaposi's sarcoma may occur in HAART-naïve individuals with AIDS-related Kaposi's sarcoma. Gastrointestinal Kaposi's sarcoma may present with sudden increase in size or inflammation leading to acute intestinal obstruction. This does not indicate failure of HAART or a need for changes in anti-retroviral regimen.</p

CoRF : Colorizing Radiance Fields using Knowledge Distillation

Neural radiance field (NeRF) based methods enable high-quality novel-view synthesis for multi-view images. This work presents a method for synthesizing colorized novel views from input grey-scale multi-view images. When we apply image or video-based colorization methods on the generated grey-scale novel views, we observe artifacts due to inconsistency across views. Training a radiance field network on the colorized grey-scale image sequence also does not solve the 3D consistency issue. We propose a distillation based method to transfer color knowledge from the colorization networks trained on natural images to the radiance field network. Specifically, our method uses the radiance field network as a 3D representation and transfers knowledge from existing 2D colorization methods. The experimental results demonstrate that the proposed method produces superior colorized novel views for indoor and outdoor scenes while maintaining cross-view consistency than baselines. Further, we show the efficacy of our method on applications like colorization of radiance field network trained from 1.) Infra-Red (IR) multi-view images and 2.) Old grey-scale multi-view image sequences.Comment: AI3DCC @ ICCV 202

Coping the arsenic toxicity in rice plant with magnesium addendum for alluvial soil of indo-gangetic Bengal, India

Arsenic (As3+) is a toxic metalloid found in the earth’s crust, its elevated concentration is a concern for human health because rice is the staple grain in eastern part of India and the waterlogged rice field environment provides opportunity for more As3+ uptake. Magnesium (Mg2+) is an important plant nutrient. Present work is a search for reducing As3+ toxicity in plants through Mg2+ application. The findings are quite impressive, the root to shoot biomass ratio showed more than 1.5 times increase compared to the control. Total protein content increased 2 folds. Carbohydrate and chlorophyll content increased two to three times compared to control. On the other hand, Malondialdehyde content showed a decline with the application of increased Mg2+ dose. The in-silico study shows a better interaction with As3+ in presence of Mg2+ but interestingly without stress symptoms. These findings from the research indicate that Mg2+ application can be effective in reducing As3+ induced stress in plants