9 research outputs found
Segmented Gurney Flaps for Enhanced Wind Turbine Wake Recovery
No full textThe wind turbine wake is a downstream region of kinetic energy and velocity deficit, higher turbulence and has a complex helical vortex structure. The wind turbine wake’s stability depends mainly on the ambient turbulence and the wind turbine tip- speed ratio. Researchers have developed several wake control techniques to mitigate this issue, such as static axial induction control by torque or pitch control, dynamic axial induction control by pitch control and actuating flaps or other actively controlled add- on devices. Some gaps are present in these methods, in terms of applicability of these techniques in terms of full scale validation and practicality to have the devices as add on to existing blades. To address these research gaps, this study focuses on designing and evaluating segmented Gurney flaps (in line with the ECN (now TNO Wind Energy) patent by Edwin Bot and Arne Van Garrel) for wind turbine blades to enhance the wake recovery by inducing turbulence in the wake to excite the tip vortices. 4 Gurney flaps were attached in the tip region of each blade of a GE 3.8MW research wind turbine. Field tests were conducted in this study for the wind turbine wake (using a scanning LiDAR to scan a sector up to 5.5D downstream at different altitudes; with a scan time of roughly 3 minutes) and performance analysis (using 10 minute averaged measurement data). Free vortex wake simulations were conducted to validate the faster wake breakdown by the change in lift distribution upon addition of segmented Gurney flaps. Simulations using dynamic blade element momentum theory with IEC NTM inflow conditions from cut in to cut out wind speed were conducted to assess the structural impacts on the retrofitted wind turbine. The field tests’ wake analysis was quantified with different wind speed, turbulence intensity, wind shear, wind direction conditions. Post processing of LiDAR data involved filtering, creating bin averaged data set, using Gaussian process regression and retrieval of the required wind component. The results show a consistent increase in wake recovery, generally at all downstream distances. The retrofitted configuration results are associated with a higher standard error because of a shorter testing period (due to increased noise levels) than the baseline configuration. The wake simulations indicate an earlier wake break down position, by roughly 2D. The simulations indicate AEP increase for the retrofitted wind turbine to be roughly +0.2% (+50MWh), at the expense of increased blade and tower structural loads. The wind speed weighted damage equivalent blade flapwise bending moment was found to increase by roughly +2% to +4%; with peaks observed in partial load region of the wind turbine, associated with the operating angle of attack in this region.Electrical Engineering | Sustainable Energy Technolog
MASS-ANALYZED THRESHOLD IONIZATION OF MO ( M = Ce and Pr)
No full textAuthor Institution: Department of Chemistry, University of Kentucky, Lexington, KY 40506-0055MO ( M = Ce and Pr) is produced in a pulsed laser-vaporization metal-cluster source and studied by mass-analyzed threshold ionization (MATI) spectroscopy. From the MATI spectra, the adiabatic ionization energy is determined to be 37300(5) cm for CeO, and 37885 (5) cm for PrO. Like group 3 transition metal MO (M=Sc, Y, and La) clusters we reported previously, these lanthanide clusters have a D planer structure and the vibrational modes observed are from the in-plane motions. However, the ground and other low-energy electronic states of the lanthanide oxides have a much higher electron spin multiplicity due to the existence of 4f electrons in the Ce and Pr atoms. The 4f electron of Ce atom has significantly lower energies than the 5d or 6s electrons and remain uncoupled in CeO. On the other hand, the energy differences between the 4f and 5d/6s electrons of Pr atom are relatively small, and a 4f 5d electron promotion is required in the formation of PrO. The electronic transitions responsible for the observed MATI spectra are tentatively determined to be for CeO and and for PrO
Barriers to utilization of childbirth services of a rural birthing center in Nepal: A qualitative study
Get PDF© 2017 Khatri et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. Background: Maternal mortality and morbidity are public health problems in Nepal. In rural communities, many women give birth at home without the support of a skilled birth attendant, despite the existence of rural birthing centers. The aim of this study was to explore the barriers and provide pragmatic recommendations for better service delivery and use of rural birthing centers. Methods: We conducted 26 in-depth interviews with service users and providers, and three focus group discussions with community key informants in a rural community of Rukum district. We used the Adithya Cattamanchi logic model as a guiding framework for data analysis. Results: Irregular and poor quality services, inadequate human and capital resources, and poor governance were health system challenges which prevented service delivery. Contextual barriers including difficult geography, poor birth preparedness practices, harmful culture practices and traditions and low level of trust were also found to contribute to underutilization of the birthing center. Conclusion: The rural birthing center was not providing quality services when women were in need, which meant women did not use the available services properly because of systematic and contextual barriers. Approaches such as awareness-raising activities, local resource mobilization, ensuring access to skilled providers and equipment and other long-term infrastructure development works could improve the quality and utilization of childbirth services in the rural birthing center. This has resonance for other centers in Nepal and similar countries
Indigenous approaches of pest management in vegetables with special reference to coriander in southern Rajasthan, India
Get PDFThe present survey based study was conducted to record the indigenous pest management practices which were prepared by the use of various ethnobotanical plant parts, animal bi-products etc., for vegetable pest control by the farmers of tribal community in four tribal districts of southern Rajasthan. Data revealed that nowadays, indigenous knowledge of insect-pests management is being alive in age old people of few communities, amongst tribes of southern Rajasthan is one of the community in which some farmers are still practicing indigenous tactics for controlling pests on vegetables. 28 indigenous practices constituted by locally available wild plants constituents, animal byproducts, natural resource and few spiritual mean were applied with age old knowledge of farmers recorded effective management of various insect-pests infesting vegetables including coriander. The highest Fic value was recorded for aphids followed by thrips and jassids. The used value was recorded in the range of 0.09 to 0.69 for all locations. The highest UV secured for indigenous practices of Neem leaf extract; cow butter milk + cow dung ash + chilli seed powder; Neem seed kernel extract and ker plant + neem leaf + negadi leaf extract. These practices were easy in preparation, cost effective, eco-friendly and widely acceptable by the community in region need to be documented for future reference
Radiosensitization of EMT6 mammary carcinoma cells by 2-benzoyl-3-phenyl-6,7-dichloroquinoxaline 1,4-dioxide
No full textBackground and purpose: Previously, we have reported that 2-benzoyl-3-phenyl-6,7-dichloroquinoxaline 1,4-dioxide (DCQ) is a radiosensitizer. Here, we investigate the mechanism of radiosensitization. Materials and methods: EMT6 cells were treated with DCQ for 4 h prior to ionizing radiation (IR). Flow cytometry, clonogenic assay, TUNEL, and Western blotting were performed to assess the effect of treatment on cells. Results: Propidium iodide staining of EMT6 cells treated with IR ± DCQ revealed high numbers of cells with decreased DNA, consistent with an apoptotic response. TUNEL assay revealed apoptosis was 4percent, 38percent, and 49percent 24 h after treatment with IR alone, DCQ alone, and DCQ + IR, respectively. Clonogenic assays revealed that the survival of irradiated EMT6 cells was significantly reduced by DCQ treatment. DCQ treatment abrogated the radiation-induced expression of p21 and p53. The increased apoptosis observed in DCQ + IR-treated cells was correlated to suppression of radiation-induced phosphorylation of Akt and the expression of Bcl-XL. DCQ also caused the phosphorylation of mitogen-activated protein kinases Erk and Jnk. Conclusions: The radiosensitization effect of DCQ occurs through enhancement of radiation-induced apoptosis, which correlates to the inhibition of p-Akt kinase and Bcl-XL and the activation of Erk and Jnk kinases, but appears independent of p53 induction or modulation of Bax-Bcl-2 gene expression. These data suggest DCQ should be tested as a radiosensitizer in vivo and has potential in the treatment of human solid tumors. © 2008.Adams JM, 1998, SCIENCE, V281, P1322, DOI 10.1126-science.281.5381.1322; Brugarolas J, 1999, P NATL ACAD SCI USA, V96, P1002, DOI 10.1073-pnas.96.3.1002; Cantley LC, 2002, SCIENCE, V296, P1655, DOI 10.1126-science.296.5573.1655; Chiosis G, 2001, BIOORG MED CHEM LETT, V11, P909, DOI 10.1016-S0960-894X(01)00099-3; Cory S, 2002, NAT REV CANCER, V2, P647, DOI 10.1038-nrc883; Dangi S, 2003, CELL SIGNAL, V15, P667, DOI 10.1016-S0898-6568(03)00002-0; Datta SR, 1999, GENE DEV, V13, P2905, DOI 10.1101-gad.13.22.2905; Davies SP, 2000, BIOCHEM J, V351, P95, DOI 10.1042-0264-6021:3510095; DIABASSAF M, 2000, MOL CARCINOG, V33, P198; Evan G, 1998, SCIENCE, V281, P1317, DOI 10.1126-science.281.5381.1317; Figueroa C, 2003, J BIOL CHEM, V278, P47922, DOI 10.1074-jbc.M307357200; Fukuchi K, 2000, BBA-MOL CELL RES, V1496, P207, DOI 10.1016-S0167-4889(00)00018-5; Gali-Muhtasib H, 2004, INT J ONCOL, V24, P1121; Gali-Muhtasib HU, 2005, CANCER CHEMOTH PHARM, V55, P369, DOI 10.1007-s00280-004-0907-x; Gali-Muhtasib HU, 2001, ONCOL REP, V8, P679; Gottlieb TM, 2002, ONCOGENE, V21, P1299, DOI 10.1038-sj-onc-1205181; Gottschalk AR, 2005, INT J RADIAT ONCOL, V63, P1221, DOI 10.1016-j.ijrobp.2005.08.014; Gupta AK, 2001, CANCER RES, V61, P4278; HADDADIN MJ, 1993, HETEROCYCLES, V35, P1503; Harakeh S, 2004, CHEM-BIOL INTERACT, V148, P101, DOI 10.1016-j.cbi.2004.05.002; Itani W., 2007, RAD ONCOL, V2; Kandel ES, 2002, MOL CELL BIOL, V22, P7831, DOI 10.1128-MCB.22.22.7831-7841.2002; Kim AH, 2002, NEURON, V35, P697, DOI 10.1016-S0896-6273(02)00821-8; Kirsch DG, 1998, J CLIN ONCOL, V16, P3158; Kluck RM, 1997, SCIENCE, V275, P1132, DOI 10.1126-science.275.5303.1132; Koniaras K, 2001, ONCOGENE, V20, P7453, DOI 10.1038-sj.onc.1204942; Levine AJ, 1997, CELL, V88, P323, DOI 10.1016-S0092-8674(00)81871-1; Li Qun, 2002, Current Topics in Medicinal Chemistry, V2, P939, DOI 10.2174-1568026023393318; Liang K, 2003, MOL CANCER THER, V2, P1113; Lozano G, 2000, NATURE, V404, P24, DOI 10.1038-35003670; Lu Yiling, 2003, Rev Clin Exp Hematol, V7, P205; Lu YJ, 1998, ONCOGENE, V16, P705, DOI 10.1038-sj.onc.1201585; Ma YY, 2000, ONCOGENE, V19, P2739, DOI 10.1038-sj.onc.1203597; McKenna WG, 2003, ONCOGENE, V22, P5866, DOI 10.1038-sj.onc.1206699; Nakamura JL, 2005, J NEURO-ONCOL, V71, P215, DOI 10.1007-s11060-004-1718-y; POWIS G, 1994, CANCER RES, V54, P2419; Price BD, 1996, CANCER RES, V56, P246; Riesterer O, 2004, INT J RADIAT ONCOL, V58, P361, DOI 10.1016-j.ijrobp.2003.09.050; Shayesteh L, 1999, NAT GENET, V21, P99, DOI 10.1038-5042; Shonai T, 2002, CELL DEATH DIFFER, V9, P963, DOI 10.1038-sj.cdd.4401050; Soderlund K, 2005, INT J ONCOL, V26, P25; Tang DM, 2002, J BIOL CHEM, V277, P12710, DOI 10.1074-jbc.M111598200; Tenzer A, 2001, CANCER RES, V61, P8203; Watanabe H, 2004, INT J RADIAT BIOL, V80, P451, DOI 10.1080-09553000410001702355; West KA, 2002, DRUG RESIST UPDATE, V5, P234, DOI 10.1016-S1368-7646(02)00120-6; Yang J, 2003, MUTAT RES-REV MUTAT, V543, P31, DOI 10.1016-S1383-5742(02)00069-8; YAO RJ, 1995, SCIENCE, V267, P2003, DOI 10.1126-science.7701324; Zhan M, 2004, HISTOL HISTOPATHOL, V19, P915; Zhang L, 2003, CANCER RES, V63, P422569
Abstracts of 1st International Conference on Machine Intelligence and System Sciences
Get PDFThis book contains the abstracts of the papers presented at the International Conference on Machine Intelligence and System Sciences (MISS-2021) Organized by the Techno College of Engineering, Agartala, Tripura, India & Tongmyong University, Busan, South Korea, held on 1–2 November 2021. This conference was intended to enable researchers to build connections between different digital technologies based on Machine Intelligence, Image Processing, and the Internet of Things (IoT).
Conference Title: 1st International Conference on Machine Intelligence and System SciencesConference Acronym: MISS-2021Conference Date: 1–2 November 2021Conference Location: Techno College of Engineering Agartala, Tripura(w), IndiaConference Organizer: Techno College of Engineering, Agartala, Tripura, India & Tongmyong University, Busan, South Korea
