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52 results for “active methodologies”
Dataset for "Methodology of Evaluating the Activation Energy of Oxygen Reduction Reaction on Pt-based Electrodes"
<p>High temperature proton-exchange membrane fuel cell (HT-PEMFC) technology is widely studied alternative to current energy conversion technologies based on fossil fuels. Compared to solid oxide fuel cells (SOFCs), HT-PEMFCs allow more flexibility and demand less operation control due to their lower temperature. On the other hand, HT-PEMFCs show an advantage over low-temperature PEMFCs in terms of less demand on the purity of the H2 used, the possibility to recover the generated heat, lower water management requirements, and easy heat management. One of the critical limitations of HT-PEMFC operation is a slow kinetics of the cathodic reduction of O2 (ORR) due to presence of H3PO4 which ensures proton conductivity in the system. Electrochemical dynamic methods such as cyclic voltammetry or linear sweep voltammetry (LSV) can be used to determine the kinetic parameters of ORR. These measurements can provide information on the Tafel slope and exchange current density (jex) of the ORR. However, performing these measurements under conditions relevant for HT-PEMFC operation is challenging due to presence highly concentrated H3PO4 and elevated temperature. First, determination of the kinetic parameters requires correct assessment of equilibrium potential of ORR (EORR). The value of the EORR is generally influenced by the activity (fugacity) of the reactants and products and the temperature, a discussion of the appropriate standard states of the components is also necessary. Second, the relationship between the jex and the reaction rate constant (k°), necessary for calculation of activation energy ( ), must be known. It includes consideration of the likely reaction mechanism. In this paper, the methodology for appropriate determination of was developed and used for estimation of of ORR from LSV curves measured on commercially available Pt/C catalyst under HT-PEMFC relevant conditions. In particular, the measurements were carried out using a rotating glassy carbon rod disk electrode (RRE) in purified 98 wt.% H3PO4 (as electrolyte) at temperatures of 120, 140, 160, 180 °C. Though the treatment was developed in context of ORR and HT-PEMFC, the approach is generally applicable to any electrochemical reaction.</p>
Supplementary materials of the active learning methodology for online engineering education
<p>These are the supplementary materials for the active learning methodology for engineering education integrating online and mobile learning. The methodology is focused on teaching electronics, physical computing, basic robotics, and programming. The purpose of the methodology was to provide active learning, experimentation, and reflection in online classes to the students increasing their motivation and self-efficacy.</p> <p>The file contains the following elements:</p> <ol> <li>Rubric employed to evaluate the student-created videos and blogs.</li> <li>The survey's questions of the different courses that employ online and mobile learning modalities.</li> <li>A set of URLs with examples of the blogs and videos constructed by the students.</li> </ol>
Supplementary Materials - Integrating Spatial Analyses and Microbotanical Remains: A Methodological Approach for Investigating Plant Processing Activities and Domestic Spaces at Neolithic Çatalhöyük.
<p><strong>Supplementary Materials I, II, and III - Integrating Spatial Analyses and Microbotanical Remains: A Methodological Approach for Investigating Plant Processing Activities and Domestic Spaces at Neolithic Çatalhöyük.</strong></p> <p> </p> <p><strong>Supplementary I</strong> contains the raw data for the microbotanical analyses on Buildings 80 and 131. It consists of laboratory track sheets and the raw counts of phytoliths and starch grains from each building.</p> <p><strong>Supplementary II</strong> contains: a) A detailed description of all the starch grain typologies encountered in this research along with references from modern reference collections; b) A visual example of each of the phytolith morphotypes identified and c) The variogram and the Kriging error variances.</p> <p><strong>Supplementary III</strong> refers to the R code, building shape files (Mask), and spatial data utilized to produce the Kriging and IDW stipital objects.</p>
Datasets from the publication "Delineating the geographic context of physical activities: A systematic search and scoping review of the methodological approaches used in social ecological research over two decades"
<p>Data from research article Rinne, T., Kajosaari, A., Söderholm, M., Berg, B., Pesola, A.J., Smith, M., Kyttä, M. (2022). Delineating the geographic context of physical activities: A systematic search and scoping review of the methodological approaches used in social ecological research over two decades, <em>Health and Place</em>.</p> <p>This data includes supplementary materials 1, 2, 3 and 4, PRISMA checklist and a translated research protocol.</p>
Identification of crashworthy designs combining active learning and the solution space methodology - Validation and training dataset
<p>Dataset and Python codes for training a crashworthiness classifier.</p>
Fig. 19 in A comprehensive review: Biological activity, modification and synthetic methodologies of prenylated flavonoids
Fig. 19. Synthesis of prenylated flavonoids 472–494 Reagents and conditions: (a): 3,3-dimethylallyl bromide, 10% KOH; (b): MOMCl, K CO, acetone, 0 ◦ C - RT; (c): 2 3 corresponding benzaldehyde, 10% KOH ethanol/H O, RT; (d): 5% HCl, MeOH/THF, reflux; (e) NaOAc, EtOH, reflux; (f) I, pyridine, 90 ◦ C.
Fig. 18 in A comprehensive review: Biological activity, modification and synthetic methodologies of prenylated flavonoids
Fig. 18. Synthesis of prenylated flavonoids (468–471). Reagents and conditions: (a) 1.3 N NaOH, acetone; 3,3-dimethylallyl bromide, benzene, reflux; (b) 3,3-dimethylallyl bromide, 10% KOH; (c) MOMCl, K CO, acetone, 0 ◦ C to RT; (d) p-methoxymethoxyl benzaldehyde, 10% KOH (H O/EtOH); (e) NaOAc, EtOH, reflux; (f) 3N 2 3 2 HCl, MeOH, reflux; (g) I, pyridine, 90 ◦ C.
Fig. 25 in A comprehensive review: Biological activity, modification and synthetic methodologies of prenylated flavonoids
Fig. 25. Synthetic route of C-6/C-8 prenylated flavonoids from natural precusor. Reagents and conditions: (a) CH3OCH2Cl, K2CO3, acetone, RT; (b) prenyl bromide, K CO, acetone, 45 ◦ C; (c) Florisil, toluene, reflux; (d) Montmorillonite K10, toluene, reflux; (e) dilute HCl (aq.), CH OH, RT.
Fig. 17 in A comprehensive review: Biological activity, modification and synthetic methodologies of prenylated flavonoids
Fig. 17. Chemical structures of prenylated flavonoids with anti-diabetes activity (445–465) and estrogenic activity (466–467).
Fig. 15 in A comprehensive review: Biological activity, modification and synthetic methodologies of prenylated flavonoids
Fig. 15. Synthesis of icaritin derivatives (403–412). Reagents and conditions: (f) α,ω-dibromoalkanes (15 equiv), K2CO3 (5 equiv), acetone, reflux, 12 h; (g) diethylamine or dimethylamine, DMSO, RT, 4 h; (h) 1-iodopentane, Cs2CO3, acetone, reflux, 12 h, then diethylamine, DMSO, RT, 4 h.
Fig. 14 in A comprehensive review: Biological activity, modification and synthetic methodologies of prenylated flavonoids
Fig. 14. Synthesis of icaritin derivatives (393–402). Reagents and conditions: (a) ethyl iodoacetate, K2CO3, acetone, reflux, 12 h; (b) LiOH, THF, H2O, RT, 1.5 h; (c) corresponding basic amino acid, DIC, HOBt, anhydrous DMF, RT, overnight, His = histidine, Arg = arginine, Lys = lysine; (d) corresponding basic amino acid, HATU, DIPEA, anhydrous DMF, RT, overnight; (e) piperidine, DMF, RT, 20 min.
Fig. 23 in A comprehensive review: Biological activity, modification and synthetic methodologies of prenylated flavonoids
Fig. 23. Synthetic route of C-8 prenylated flavonoids. Reagents and conditions: (a) CH3OCH2Cl, K2CO3, acetone, room temp., 83–90%; (b) 4-MOMO-benzaldehyde, KOH, EtOH, reflux, 85%; (c) I2, DMSO, reflux, 8 h, 70%; (d) oxone, acetone, CH2Cl2/NaHCO3/ Na2CO3, RT; then p-toluenesulfonic acid, RT, 76%; (e) dilute HCl (aq.), EtOH, RT, 89%; (f) prenyl bromide, K2CO3, acetone, reflux, 95%; (g) microwave, PhNEt2, reflux, 82%. (h) H2SO4 (20% aq.), CH3OH, reflux, 86%; (j) DDQ, 1,4-dioxane, reflux, 76%.
Fig. 10 in A comprehensive review: Biological activity, modification and synthetic methodologies of prenylated flavonoids
Fig. 10. Synthesis of isolaxifolin (369). Reagents and conditions: (a) 3-methyl-2-butenal, Ca(OH), MeOH, 18 ◦ C, 72 h; (b) Ac O, CH Cl, 18 ◦ C, 6 h; (c) 3-methyl-2- 2 2 2 2 buten-1-ol, DEAD, PPh, THF, 0–18 ◦ C, 6 h; (d) Eu(fod), CHCl, 60 ◦ C, 6 h; (e) K CO, MeOH, 0 ◦ C, 1 h.
Fig. 24 in A comprehensive review: Biological activity, modification and synthetic methodologies of prenylated flavonoids
Fig. 24. Regioselective synthesis of C-6/C-8 prenylated flavonoids. Reagents and conditions: (a) TEA, TBDMS-Cl, H2SO4, dichloromethane, room temp., 83%; (b) Prenyl alcohol, TPP, DIAD, dichloromethane, ice bath, 56%; (c) Eu(fod), toluene, 140 ◦ C, 81%; (d) NaH, pivaloyl vanilloyl chloride (aq.), tetrahydrofuran, reflux, 3 85%; (e) CuCl, TMS-Cl, dry acetonitrile, RT, 60%; (f) i TBAF (aq.) dry tetrahydrofuran ii Pyrrolidine, H SO, 60%; (g) Pivaloyl chloride, DMAP, dry pyridine, 40 ◦ C, 2 2 4 15 min, H SO dilution; (h) TFA, dichloromethane, water, 30 ◦ C, 72%.
Fig. 7 in A comprehensive review: Biological activity, modification and synthetic methodologies of prenylated flavonoids
Fig. 7. Synthesis of icaritin derivatives (237–272). Reagents and conditions: i. bromo-carboxylic acid ethyl esters (2.5–4.0 equiv.), acetone, K2CO3, reflux, 6 h; ii. bromo-carboxylic acid ethyl esters (1.0–1.5 equiv.), acetone, K2CO3, reflux, 6 h; iii. NaOH, MeOH/H2O (2:1), rt, 4 h; iv. glutaric anhydride, DMAP, TEA, DCM, rt, 8 h.
Fig. 4 in A comprehensive review: Biological activity, modification and synthetic methodologies of prenylated flavonoids
Fig. 4. Synthesis of antiproliferative prenyl flavonoid derivatives (197–207). Reagents and conditions: (a) CH CN, ZnCl, Et O, HCl g, 0–5 ◦ C; (b) H O, reflux, 2 h; 3 2 2 2 (c) Me SO, K CO, acetone, rt, 0.5 h; (d) benzaldehyde or p-anisaldehyde, KOH, EtOH, H O, rt, 3 h; (e) CH –CHCH Br, K CO, acetone, reflux, 12 h; (f) heat, 2 4 2 3 2 2– 2 2 3 210 ◦ C, 4 h; (g) CH COONa, C H OH, reflux, 24 h; (h) I, pyridine, 90 ◦ C, 16 h; (i) KMnO, HIO, i-PrOH, H O, rt; (j) R R CHP + Ph3Br, n-BuLi, THF, rt, 24 h; (k) 1 3 2 5 2 4 4 2 2 3 equiv BBr3, ClCH2CH2Cl, rt, 2 h; (l) 8 equiv BBr3, ClCH2CH2Cl, reflux, 4 h.
Fig. 6 in A comprehensive review: Biological activity, modification and synthetic methodologies of prenylated flavonoids
Fig. 6. Synthesis of potential MDR reversal icariin derivatives (231–236). Reagents and conditions: (a) H2SO4 (2–5 equiv), 90% EtOH, reflux; 1.5 h; (b) 20% H2SO4, MeOH, reflux, 2 h; (c) 20% H SO, MeOH, 25 ◦ C, 4 h; (d) ClSO CH, Et N, 4 h, then HCl; (e) ClSO CH, pyridine, 0 ◦ C, 3 h; then HCl; (f) ClSO NH, DMA, CH Cl, 2 4 2 3 3 2 3 2 2 2 2 0 ◦ C, 3 h; (g) ClSO H, Et N, 0 ◦ C, 3 h; then HCl.
Fig. 5 in A comprehensive review: Biological activity, modification and synthetic methodologies of prenylated flavonoids
Fig. 5. Synthesis of 4′-methoxy licoflavanone derivatives (208–230). Reagents and conditions: (a) RX, K CO, dry acetone, room temperature, 1–4 h, 75–86%; (b) 2 3 Propargyl bromide, K2CO3, dry acetone, room temperature, 2 h, 89% (c) TfN3, CuSO4 (aq.), Et3N, CH2Cl2/MeOH, 2–4 h, 90–96% (d) Sodium ascorbate, R–N3, CuSO4⋅5H2O, t-BuOH/water (1:1), 85–93%.
Fig. 27 in A comprehensive review: Biological activity, modification and synthetic methodologies of prenylated flavonoids
Fig. 27. Synthesis of C-3-prenylated flavonoids. Reagents and conditions: (a) CH OCH Cl, K CO, acetone 0 ◦ C, RT; (b) 3-methylbut-2-enyl bromide (2 equiv), fresh 3 2 2 3 LDA (2.5 equiv), THF, 75 ◦ C–4 ◦ C, 20 h, 50%; (c) ArCHO (2 equiv), NaHMDS (3 equiv), THF, 75 ◦ C to reflux, 30 h, 13–46%; (d) 4 N HCl, MeOH, reflux, 8–15 h, 22–63%.
Methodology for Developing an Occlusal Appliance With CBD Active Carrier
ClinicalTrials.gov study NCT04775030. IPD Sharing: NO. Countries: 1. Publications: 5.
ScienceDex guides
Understand access before you commit
These curated guides explain access requirements, typical timelines, costs, and reuse considerations for widely used research datasets.
Allen Brain Atlas
Allen Brain Atlas is an Allen Institute collection of brain map atlases, datasets, APIs, and analysis tools covering mouse, human, and non-human primate brain resources.
Annotated Behaviour and Observability Dataset (ABODe)
ABODe is a University of Edinburgh DataShare dataset for behavior classification in group-housed mice using home-cage video, identities, bounding boxes, ground-plate positions, and annotator labels.
DANDI Archive for NWB datasets
DANDI is a BRAIN Initiative archive for publishing and sharing neurophysiology data, including electrophysiology, optophysiology, and behavioral data packaged as NWB and related standards.
International Brain Laboratory public data
The International Brain Laboratory public data releases expose standardized mouse decision-making experiments, including Neuropixels recordings, widefield calcium imaging, behavior, and session metadata accessed through the ONE API.
OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.