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"Gandhi, V"
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Mechanical and Thermal Analysis of Cissus Quadrangularis Stem Fiber/Epoxy Composite with Micro-Red Mud Filler Composite for Structural Application
2022
The Cissus quadrangularis stem fiber (CQSF)-reinforced epoxy composite particulate filled with micro-red mud has been fabricated, and the mechanical and thermal behaviors have been investigated. The different compositions of the samples were prepared by the hand layup method. The base material was prepared with the composition of epoxy resin and 30 wt% CQSF at 40 mm of fiber length. Excluding base material, four more samples have been prepared by adding filler material at 2.5, 5, 7.5, and 10 wt%. The tensile and flexural strength of the materials increased up to 5 wt% addition of red mud and reduced thereafter, whereas the hardness increased gradually with the addition of filler content. The maximum energy absorption capacity was obtained at 7.5 wt% red mud addition. The highest char production was achieved at 10 wt% red mud filler addition, according to thermogravimetric analysis (TGA). The optimized wear and mechanical characteristics were supported by scanning electron microscope (SEM) pictures of the mechanically broken surfaces.
Journal Article
The phosphoinositide-3-kinase (PI3K)-delta and gamma inhibitor, IPI-145 (Duvelisib), overcomes signals from the PI3K/AKT/S6 pathway and promotes apoptosis in CLL
by
Rosin, N Y
,
Burger, J A
,
Wierda, W G
in
1-Phosphatidylinositol 3-kinase
,
13/2
,
631/67/1990/283/1895
2015
The functional relevance of the B-cell receptor (BCR) and the evolution of protein kinases as therapeutic targets have recently shifted the paradigm for treatment of B-cell malignancies. Inhibition of p110δ with idelalisib has shown clinical activity in chronic lymphocytic leukemia (CLL). The dynamic interplay of isoforms p110δ and p110γ in leukocytes support the hypothesis that dual blockade may provide a therapeutic benefit. IPI-145, an oral inhibitor of p110δ and p110γ isoforms, sensitizes BCR-stimulated and/or stromal co-cultured primary CLL cells to apoptosis (median 20%,
n
=57;
P
<0.0001) including samples with poor prognostic markers, unmutated IgVH (
n
=28) and prior treatment (
n
=15;
P
<0.0001). IPI-145 potently inhibits the CD40L/IL-2/IL-10 induced proliferation of CLL cells with an IC
50
in sub-nanomolar range. A corresponding dose-responsive inhibition of pAKT
Ser473
is observed with an IC
50
of 0.36 n
M
. IPI-145 diminishes the BCR-induced chemokines CCL3 and CCL4 secretion to 17% and 37%, respectively. Pre-treatment with 1 μ
M
IPI-145 inhibits the chemotaxis toward CXCL12; reduces pseudoemperipolesis to median 50%, inferring its ability to interfere with homing capabilities of CLL cells. BCR-activated signaling proteins AKT
Ser473
, BAD
Ser112
, ERK
Thr202/Tyr204
and S6
Ser235/236
are mitigated by IPI-145. Importantly, for clinical development in hematological malignancies, IPI-145 is selective to CLL B cells, sparing normal B- and T-lymphocytes.
Journal Article
Physiotherapy rehabilitation for osteoporotic vertebral fracture—a randomised controlled trial and economic evaluation (PROVE trial)
2020
SummaryThe trial compared three physiotherapy approaches: manual or exercise therapy compared with a single session of physiotherapy education (SSPT) for people with osteoporotic vertebral fracture(s). At 1 year, there were no statistically significant differences between the groups meaning there is inadequate evidence to support manual or exercise therapy.IntroductionTo evaluate the clinical and cost-effectiveness of different physiotherapy approaches for people with osteoporotic vertebral fracture(s) (OVF).Methods>Prospective, multicentre, adaptive, three-arm randomised controlled trial. Six hundred fifteen adults with back pain, osteoporosis, and at least 1 OVF participated. Interventions: 7 individual physiotherapy sessions over 12 weeks focused on either manual therapy or home exercise compared with a single session of physiotherapy education (SSPT). The co-primary outcomes were quality of life and back muscle endurance measured by the QUALEFFO-41 and timed loaded standing (TLS) test at 12 months.ResultsAt 12 months, there were no statistically significant differences between groups. Mean QUALEFFO-41: − 1.3 (exercise), − 0.15 (manual), and − 1.2 (SSPT), a mean difference of − 0.2 (95% CI, − 3.2 to 1.6) for exercise and 1.3 (95% CI, − 1.8 to 2.9) for manual therapy. Mean TLS: 9.8 s (exercise), 13.6 s (manual), and 4.2 s (SSPT), a mean increase of 5.8 s (95% CI, − 4.8 to 20.5) for exercise and 9.7 s (95% CI, 0.1 to 24.9) for manual therapy. Exercise provided more quality-adjusted life years than SSPT but was more expensive. At 4 months, significant changes above SSPT occurred in endurance and balance in manual therapy, and in endurance for those ≤ 70 years, in balance, mobility, and walking in exercise.ConclusionsAdherence was problematic. Benefits at 4 months did not persist and at 12 months, we found no significant differences between treatments. There is inadequate evidence a short physiotherapy intervention of either manual therapy or home exercise provides long-term benefits, but arguably short-term benefits are valuable.Trial registrationISRCTN 49117867.
Journal Article
Advances in Wastewater Treatment I
2021
The book presents new materials and methods for waste water treatments. Keywords: Wastewater Treatment, Organic Molecule Degradation, Bio Flocculants, Coagulants, Pyrene, Pharmaceutical Compounds, Photocatalytic Degradation, Nanocrystalline Titanium Dioxide, Arsenic Removal, Membrane Technology, Activated Charcoal, Adsorbent Derived from Egg Shells, Degradation of Polycyclic Aromatic Hydrocarbons, Colorimetric Analysis, Luminescence, Spectroscopy, Atomic Absorption, Mass Spectrometric and Biosensor Based Techniques.
Combination of cladribine and cytarabine is effective for childhood acute myeloid leukemia: results of the St Jude AML97 trial
2009
Because cladribine can increase cytarabine triphosphate levels, we tested a cladribine–cytarabine combination in the St Jude AML97, trial in which this combination was administered before standard chemotherapy to 96 children with acute myeloid leukemia (AML) or myelodysplastic syndrome. Patients received a 5-day course of cladribine (9 mg/m
2
per dose) and cytarabine either as daily 2-h infusions (500 mg/m
2
per dose) (arm A) or a continuous infusion (500 mg/m
2
per day) (arm B). Ara-CTP levels and inhibition of DNA synthesis increased from day 1 to day 2, but were not different between the two arms. In addition, the median blast percentages at day 15 did not differ between arms A and B, but patients treated in arm A had shorter intervals between the initiation of the first and second courses of therapy. Thus, although there were trends toward better complete remission rates and overall survival for patients treated in arm B, the reduced efficacy of arm A may have been partially compensated by more intense timing of therapy for that group. For all patients, 5-year event-free survival and overall survival estimates were 44.1±5.4 and 50.0±5.5%. Our results suggest that cladribine in combination with continuous-infusion cytarabine is effective therapy for childhood AML.
Journal Article
Investigations on solar PV integration and associated power quality challenges in distribution systems through the application of MCS and GA
by
Jadoun, V. K.
,
Garg, Akhil
,
Barutcu, Ibrahim Cagri
in
Alternative energy
,
Civil Engineering
,
Computer simulation
2024
In the forthcoming decades, significant advancements will shape the construction and operations of distribution systems. Particularly, the increasing prominence of photovoltaic (PV) systems in the power industry will impact the security of these systems. This study employs Monte Carlo Simulation (MCS) in conjunction with genetic algorithm (GA) and differential evolution (DE) to address uncertainties. The probability density functions (pdf) for total voltage harmonic distortion (UTHD), individual voltage harmonic distortion (UIHDh), and RMS voltage (URMS) have been determined for utilization in chance constrained framework. In addition, the uncertainty effects of PV systems on grid losses for various solar radiation conditions are also investigated. Specifically, the paper aims to evaluate these impacts within the context of stochastic limits. The PV system sizing problem has been addressed inside the distribution system using a chance-constrained framework. A key contribution is the integration of GA, DE, and MCS into a cohesive approach, and the study evaluates the benefits of this approach through an analysis of outcomes derived from the stochastic method. The simulation results illustrate the advantages of the proposed stochastic GA methodology.
Journal Article
An Internal Digital Image Correlation Technique for High-Strain Rate Dynamic Experiments
by
Gandhi, V.
,
Lawlor, B.P.
,
Ravichandran, G.
in
Accuracy
,
Biomedical Engineering and Bioengineering
,
Characterization and Evaluation of Materials
2025
Background
Full-field, quantitative visualization techniques, such as digital image correlation (DIC), have unlocked vast opportunities for experimental mechanics. However, DIC has traditionally been a surface measurement technique, and has not been extended to perform measurements on the interior of specimens for dynamic, full-scale laboratory experiments. This limitation restricts the scope of physics which can be investigated through DIC measurements, especially in the context of heterogeneous materials.
Objective
The focus of this study is to develop a method for performing internal DIC measurements in dynamic experiments. The aim is to demonstrate its feasibility and accuracy across a range of stresses (up to
650
MPa), strain rates (
10
3
-
10
6
s
-
1
), and high-strain rate loading conditions (e.g., ramped and shock wave loading).
Methods
Internal DIC is developed based on the concept of applying a speckle pattern at an inner-plane of a transparent specimen. The high-speed imaging configuration is coupled to the traditional dynamic experimental setups, and is focused on the internal speckle pattern. During the experiment, while the sample deforms dynamically, in-plane, two-dimensional deformations are measured via correlation of the internal speckle pattern. In this study, the viability and accuracy of the internal DIC technique is demonstrated for split-Hopkinson (Kolsky) pressure bar (SHPB) and plate impact experiments.
Results
The internal DIC experimental technique is successfully demonstrated in both the SHPB and plate impact experiments. In the SHPB setting, the accuracy of the technique is excellent throughout the deformation regime, with measurement noise of approximately
0.2
%
strain. In the case of plate impact experiments, the technique performs well, with error and measurement noise of
1
%
strain.
Conclusion
The internal DIC technique has been developed and demonstrated to work well for full-scale dynamic high-strain rate and shock laboratory experiments, and the accuracy is quantified. The technique can aid in investigating the physics and mechanics of the dynamic behavior of materials, including local deformation fields around dynamically loaded material heterogeneities.
Journal Article
Harmonic Elimination and dc-link Voltage Balancing in Bipolar Hybrid Microgrid by ILCs: A Review
2020
In this advanced power system scenario, the bipolar hybrid microgrid application plays a vital role, which owns both DC and AC bus instantaneously. In this grid-connected technology, renewable energy performs a major role in the generation of power demand. Due to the alternating nature of renewable sources, the grid should have stability with different energy sources like battery storage systems, vehicle to grid, etc. Hence, to retain the quality of power supply it is more significant to consider an interlinking bidirectional converter between a source and the grid. The most important indispensable component in the bidirectional link is an AC/DC bidirectional converter. This paper elaborates about the advantages and disadvantages of the prevailing AC/DC bidirectional converter topologies for the advancement in the microgrid applications. These types of three-phase ac/dc bidirectional converters are preferred to reduce the THD content in the grid side, power factor correction, and regulated dc output voltage with unidirectional and bidirectional power flow. The dc-link voltage has balanced at the dc bus with these bidirectional topologies. By use of this bidirectional converter, it has designed to perform various essential applications in the microgrid with the help of space vector modulation.
Journal Article
Evaluation and Analysis of Environmental Noise Pollution in Seven Major Cities of India
2017
The paper describes the noise monitoring data acquired from the pilot project on the establishment of National Ambient Noise Monitoring Network (NANMN) across seven major cities in India for continuous noise monitoring throughout the year. The annual average L
(06-22 h) and L
(22-06 h) values observed in year 2011-2014 for the 35 locations under study in which 14 locations are in commercial zone,5 in Industrial, 7 in residential and 9 in silence zones are described. The long-term noise monitoring shows that ambient noise levels have marginally increased for 29 sites (82.9%) since past four years. The present study is focused on evaluation and analysis of environmental noise pollution at 35 noise monitoring sites in seven major cities of India and shall be instrumental in planning for the noise abatement measures for controlling the noise pollution in these sites.
Journal Article
Harmonic elimination and dc-link voltage balancing in bipolar hybrid microgrid using Space vector modulation for Interlinking Converter (ILC)
2020
The modernization of distribution grids developed the power systems towards the smart grid. The microgrid plays a vital role in an improving power systems area, which refers to the loads operated under an organized and synchronized way and the distributed energy resources. The microgrid, which is operated in \"islanded\" mode, should be connected to the main power grid, or it must be entirely off-grid. Bipolar hybrid microgrid feeds local loads with local resources because it consists of both DC and AC bus simultaneously. The converter, which is used for microgrid application, plays an important role, which is said to be Interlinking Converter (ILC). The lower order harmonics can be eliminated by these ILCs. By reducing the THD and increasing the dc-link voltage utilization SVM is used. In this paper, there will be an increase in system performance and great reliability with a fully automated system. There will be a decrease in switching losses, current ripple and THD of grid current by the use of a new switching modulation method, which is validated by the Matlab simulation results.
Journal Article