259 research outputs found
Optimization and control of wind energy systems for grid integration
No full textWind energy is a rapidly expanding source of renewable energy, but wind resources are highly intermittent. This makes increasing the level of wind energy penetration in an overall energy portfolio challenging if power quality and grid frequency is to be maintained. In a conventional power system, grid frequency regulation is typically achieved by means of some form of active power control (APC) of power generation plants. Active power control of plant power output aims to maintain the power balance between generation and consumption. Wind turbines have historically not participated in the active power control and are therefore isolated from the grid using sophisticated power electronics, increasing the cost of wind energy. Interest in studying APC of wind turbines for grid frequency regulation has been revived recently. Most of the proposed approaches either focus on single turbine, or overlook the effect of APC strategies on actuator usage and mechanical loading of the system. However, wind energy based power generation plants have an array of wind turbines that interact with each other aerodynamically in a complicated manner. In this work we introduce a new distributed APC strategy in which a farm level controller optimally distributes the task of regulation to all the wind turbines in a farm accounting for dynamic wake effects introduced due to control actions of each of those wind turbines. An individual model predictive controller at each wind turbine then tracks the power references passed on by farm level controller, subject to mechanical loading constraints. The results from this approach are compared with the greedy approach when the individual wind turbines only optimize their own power production without consideration of downstream neighbors. We then extend the idea of this hierarchical control to co-optimization of wind farms and battery energy storage for regulation, and then for simultaneous wind farm layout and control design to exploit the synergy between layout design and wind farm control.
We show that the regulation performance scores for the distributed APC approach are statistically significantly better than the greedy approach. We also show that co-optimization of wind farm and battery energy storage provides significantly superior performance over baseline, for a much smaller battery capacity, providing a potentially significant cost saving. Finally, we show that designing a layout with simultaneous consideration of control system design, allows us harness synergistic relationships between layout and control. Capitalizing on these synergy mechanisms enables increased annualized wind farm energy production.Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2019-05-01The student, Anand Deshmukh, accepted the attached license on 2017-02-02 at 12:49.The student, Anand Deshmukh, submitted this Dissertation for approval on 2017-02-02 at 12:58.This Dissertation was approved for publication on 2017-02-02 at 16:41.DSpace SAF Submission Ingestion Package generated from Vireo submission #10553 on 2017-08-10 at 15:04:23Made available in DSpace on 2017-08-10T20:32:27Z (GMT). No. of bitstreams: 2
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Previous issue date: 2017-02-02Embargo set by: Colleen Fallaw for item 102706
Lift date: 2019-08-10T21:27:21Z
Reason: Author requested U of Illinois access only (OA after 2yrs) in Vireo ETD systemU of I Only Restriction Lifted for Item 102706 on 2019-08-11T09:15:16Z
Development and validation of a simple analytical method for the determination of 2,4,6-trichloroanisole in wine by GC–MS
No full textA novel method for the residue analysis of wine spoilage compound 2,4,6-trichloroanisole is reported. Wine (60 ml) was extracted with 2 ml toluene in presence of 24 g MgSO4 and 6 g NaCl. Cleanup of the toluene phase by dispersive solid phase extraction with mixture of 100 mg CaCl2, 25 mg primary secondary amine and 50 mg MgSO4 was effective in minimising co-extractives and matrix effects. Time-of-flight and tandem mass spectrometric parameters were optimised to achieve linearity over 0.25–500 ng ml1 and method detection limit 0.0083 ng ml1 which is well below the odour threshold of 0.04 ng ml1 . Recoveries at 0.04, 0.2 and 0.8 ng ml1 were within 80–110% (±8%). The method was reproducible when tested for Argentinean wines with intra-laboratory Horwitz ratios being <0.20 in white and red wines at both the laboratories of India and Argentina. The method could be successfully applied for incurred wine samples.Fil: Patil, Sagram H.. National Research Centre For Grapes; India. Shivaji University; IndiaFil: Banerjee, Kaushik. National Research Centre For Grapes; IndiaFil: Utture, Sagar C.. National Research Centre For Grapes; IndiaFil: Fontana, Ariel Ramón. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Regional de Investigaciones Científicas y Tecnológicas. Laboratorio de Investigaciones y Servicios Ambientales Mendoza; ArgentinaFil: Altamirano, Jorgelina Cecilia. Universidad Nacional de Cuyo. Facultad de Ciencias Exactas y Naturales; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Regional de Investigaciones Científicas y Tecnológicas. Laboratorio de Investigaciones y Servicios Ambientales Mendoza; ArgentinaFil: Oulkar, Dasharath P.. National Research Centre For Grapes; IndiaFil: Wagh, Sameer S.. National Research Centre For Grapes; IndiaFil: Dasgupta, Soma. National Research Centre For Grapes; IndiaFil: Patil, Shubhangi B.. National Research Centre For Grapes; IndiaFil: Jadhab, Manjusha R.. National Research Centre For Grapes; IndiaFil: Ugare, Bharat R.. National Research Centre For Grapes; IndiaFil: Adsule, Pandurang G.. National Research Centre For Grapes; IndiaFil: Deshmukh, Madhukar B.. Shivaji University; Indi
Integrin Alpha v Beta 6 (αvβ6) and Its Implications in Cancer Treatment
No full textIntegrins are necessary for cell adhesion, migration, and positioning. Essential for inducing signalling events for cell survival, proliferation, and differentiation, they also trigger a variety of signal transduction pathways involved in mediating invasion, metastasis, and squamous-cell carcinoma. Several recent studies have demonstrated that the up- and down-regulation of the expression of αv and other integrins can be a potent marker of malignant diseases and patient prognosis. This review focuses on an arginine-glycine-aspartic acid (RGD)-dependent integrin αVβ6, its biology, and its role in healthy humans. We examine the implications of αVβ6 in cancer progression and the promotion of epithelial-mesenchymal transition (EMT) by contributing to the activation of transforming growth factor beta TGF-β. Although αvβ6 is crucial for proper function in healthy people, it has also been validated as a target for cancer treatment. This review briefly considers aspects of targeting αVβ6 in the clinic via different therapeutic modalities
Study On Ponderal Index Of Fish Puntius sarana(Hamilton) From Godavari River, At Nanded, Maharashtra State, India
No full textAbstract: Study of Ponderal index of freshwater fish Puntius sarana(Hamilton), from Godavari River, at Nanded, Maharahtra State were observed from April 2015 to March 2016. The obtained results indicate that population of Puntius sarana is better in condition throughout the year even in spawning season. LeCren (1951) remarks “The ponderal index forms an important part of fishery research and has often been issued to provide additional information about spawning, feeding and other aspects related to the well being of a fish. Several other workers have been made investigations on the condition factor of different species and correlated the variation in ‘K’ values with various factor in life of fish. Hickling (1930,1940), Hile (1936), Thompson (1943), Menon (1950), LeCren (1951) have correlated the ponderal index with spawning cycle and feeding intensity in Johnius dussmieri. Review of literature shows there is no information regarding the ponderal index of Puntius sarana. Therefore the present investigation was undertaken with a view to study the ponderal index of this fish.
Keywords: fish Puntius sarana(Hamilton), Godavari River, spawning season, ponderal index.
Title: Study On Ponderal Index Of Fish Puntius sarana(Hamilton) From Godavari River, At Nanded, Maharashtra State, India
Author: Deshmukh M.M., Shillewar K.S.
International Journal of Life Sciences Research
ISSN 2348-313X (Print), ISSN 2348-3148 (online)
Vol. 10, Issue 2, April 2022 - June 2022
Page No: 41-43
Research Publish Journals
Website: www.researchpublish.com
Published Date: 09-June-2022
DOI: https://doi.org/10.5281/zenodo.6627906
Paper Download Link (Source)
https://www.researchpublish.com/papers/study-on-ponderal-index-of-fish-puntius-saranahamilton-from-godavari-river-at-nanded-maharashtra-state-indiaInternational Journal of Life Sciences Research, ISSN 2348-313X (Print), ISSN 2348-3148 (online), Research Publish Journals, Website: www.researchpublish.co
Cache Blocking and Parallel Runtime Scheduling of Hierarchical Matrices
No full textImportant scientific problems in electrostatics, acoustics and statistics can be solved using the Boundary Element Method (BEM). The coefficient matrix from a BEM discretization results in a dense matrix, leading to O(N^2) and O(N^3) time complexity for the matrix-vector product and direct factorization algorithms, respectively. The underlying geometry from which the dense matrix is generated can be exploited in order to approximate the interactions between far points. These points are expressed in the dense matrix as off-diagonals blocks. Low rank approximation of the off-diagonal blocks of such a structured dense matrix can reduce the time complexity of the matrix-vector product and direct factorization algorithms to by trading off accuracy for time. The accuracy of the algorithm can be tuned to match the required accuracy of the application.Algorithmic developments of the compression, multiplication and factorization routines of such low rank approximated matrices have led to reduction in the time complexity and better accuracy for a wide variety of problems. However, the implementation of such routines on modern, highly parallel computer architectures for such routines still requires the use of numerical software that was originally written for computation of dense linear algebra. The small, irregular kernels that are prevalent in the algorithms involving low rank approximation result in inefficient execution on modern hardware.In this thesis, we propose improvements to the efficiency of the matrix-vector product and direct factorization algorithms of low rank approximated dense matrices on shared and distributed memory machines. We show that our techniques are applicable to 2D problems for modeling acoustic waves, electrostatics and statistics with acceptable accuracy for the application in question. We target the block low rank and hierarchically semi-separable low rank matrix formats for this study since they have been shown to work well with 2D problems.The first part of this thesis improves the efficiency of the matrix-vector product. The matrix-vector product is useful for problems arising from the wave equation. The low rank matrix multiplication algorithm is a key computational kernel of the matrix vector product. We design efficient cache blocking algorithms by leveraging the Execution-Cache-Memory performance model. Our portable implementation making use of parallel loops written in a high level language with architecture-specific assembly micro-kernels. This preserves the portability of our method and allows us outperform vendor optimized BLAS libraries on the Fujitsu A64FX, Intel Xeon 6148 and AMD EPYC 7502 CPUs. We improve the matrix vector product of low rank matrices by obtaining a 2x performance improvement in the low rank matrix multiplication algorithm on all CPU architectures.The second part of this thesis improves the distributed memory factorization of hierarchical matrices arising out of 2D problems from electrostatics and statistics. Specifically, we show that we achieve up to 2x improvement in weak scaling performance over the state-of-the-art in dense direct factorization on up to 128 nodes of Fugaku. We show that this improvement in speed can be achieved with similar or better accuracy than other state-of-the-art implementations making use of low rank approximation of structured dense matrices. The main reasons behind the improvement can be attributed to the use of the HSS-ULV algorithm with a distributed asynchronous runtime system. The combination of an algorithm needing computation and communication with an asynchronous distributed runtime system results in better overlap of computation with communication and results in better performance.identifier:oai:t2r2.star.titech.ac.jp:5067291
Invitro Cytotoxic and Cytoprotective Activity of Silibinin and Genistein on Breast and Colon Cell Lines.
No full textCancer known medically as a malignant neoplasm, is a large group of different diseases, all involving unregulated cell growth. In cancer, cells divide and grow uncontrollably, forming malignant tumors, and invade nearby parts of the body. The cancer may also spread to more distant parts of the body through the lymphatic system or bloodstream. Not all tumors are cancerous. Benign tumors do not grow uncontrollably, do not invade neighboring tissues, and do not spread throughout the body to evaluate the in-vitro cytotoxic and cytoprotective activity of silibinin and genistein on breast and colon cell lines. It was found that there was significant decrease in the viability of the cells, when the cells are treated with the two compounds silibinin and genistein. The compounds has shown marked cytotoxicity in single and in combination treatments. The compounds has shown a significant results in combination treatment on the breast and colon cancer cell lines comparison with the single treatment. The antioxidant nature of genistein has confirmed by in-vitro antioxidant studies which showed good results at different concentrarions and also the silibinin has also shown good cytoprotective activity in-vitro in single and in combination treatments
Cache Blocking and Parallel Runtime Scheduling of Hierarchical Matrices
No full textidentifier:oai:t2r2.star.titech.ac.jp:5067295
Behavior of cold-formed steel web elements with web openings subjected to web crippling and a combination of bending and web crippling for interior-one-flange loading
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