5,201 research outputs found
Physicochemical properties of JS@GO nanofluid and its potential in enhanced oil recovery
No full textEmploying nanofluid flooding as an advanced enhanced oil recovery (EOR) technique has emerged as a groundbreaking approach for the extraction of residual hydrocarbons from increasingly depleted reservoirs. The innovative utilization of nanocomposites, specifically Janus SiO2 (JS) particles amalgamated with graphene oxide (GO), constitutes the focus of this research. We elucidate how this novel JS@GO nanocomposite enhances oil displacement through its exemplary interfacial activity, substantiated by various empirical evaluations such as contact angle and interfacial tension tests. Moreover, core flooding experiments corroborate the nanocomposite’s superior efficiency in augmenting oil recovery vis-a-vis traditional methodologies, which was due to the improvement of both emulsifying ability and amphiphilicity. The results of this research underscore the considerable promise the JS@GO nanofluid holds for future EOR applications, providing a compelling alternative for revitalizing oil production from heretofore unyielding reservoirs. Nanofluid flooding is recognized as an innovative EOR technique for residual oil. A novel JS@GO nanocomposite was successfully synthesized for EOR application. Interfacial activity of JS@GO was assessed using contact angle and IFT tests. Core flooding experiments underscore JS@GO nanofluid’s superior oil recovery capability. </p
Snapping microswitches with adjustable acceleration threshold
No full textThis paper presents the design, fabrication and testing of prestressed bimorph microbeams for applications to tunable acceleration switches. The prestressed bimorph beams are buckled due to the residual stress difference between two dissimilar films, thereby generating initial beam deflections upon fabrication. Necessary and sufficient conditions for snapping action of the deflected bimorph beam have been derived from snap-through buckling analysis. A set of SiO2/p(+)-silicon bimorph beams has been designed and fabricated in three different lengths, 800, 900 and 1000 mu m. The electrostatic snap-through voltage for each microbeam has been measured as 32, 56.3 and 76.5 V, respectively. Micromechanical properties of beam materials have been measured from on-chip test structures. It is demonstrated that the three different microswitches with a 7 mu g proof-mass can be applicable to acceleration switches, where threshold acceleration levels can be adjustable within the ranges 0-14, 0-35 and 0-47 g, respectively, under inter-electrode bias voltages of 0-76 V
Pilot-scale SBR and MF operation for the removal of organic and nitrogen compounds from greywater
No full textA pilot plant of SBR (Sequencing Batch Reactor) and MF (microfiltration) process was operated in order to treat and reuse the greywater produced from an office building. The performance of SBR for greywater was satisfactory as the effluent had 20 mg/l, 5 mg/l, and 0.5 mg/l of SCOD, BOD, and ammonia, respectively. The cyclic operation of SBR used in this study proved more effective in nitrification and denitrification than the conventional SBR operation. However, the most effective mode was step-feed SBR for denitrification. The decanting system of this SBR discharged the effluent fairly well without sludge washout. However, it was difficult to maintain constant concentration of suspended solid from the SBR process. Thus, additional filtration was needed to get adequate water quality for water reuse. MF could remove residual suspended solids and pathogens as well from the SBR effluent. The suspended solids of final effluent were around 1 mg/l and allowed using the treated water for some purposes. (C) 1998 Published by Elsevier Science Ltd. All rights reserved.This research is supported by KOWACO and SAM KWANG AQUA-CLEAR, INC. The author is grateful for their valued assistance
Chosen logistics processes in Škoda JS
No full textThis master thesis deals with the purchase and sale process in Škoda JS company. The aim of this work is to assess whether the setting of the purchase and sale process is met by the company also within a real business case, in compliance with set controls, and whether the degree of perfect delivery is sufficient. In the introduction, the author specifies the basic terms: logistics, logistic chain, customer benefits, information systems in logistics, buying and selling. The following chapter introduces Škoda JS company, including the sphere of its entrepreneurial activity. This chapter also deals with the nuclear power industry. In the crucial chapter, the author describes the process of purchase and sale in Škoda JS company and compares it with a real business case. In conclusion, the author evaluates discrepancies and suggests recommendations to avoid them
Heat transfer enhancement using flow-induced vibration of a microfin array
No full textAdvanced computers are facing thermal engineering challenges from both high heat generation due to rapid performance improvement and the reduction of an available heat removal surface due to large packaging density. Efficient cooling technology is desired to provide reliable operation of microelectronic devices. This paper investigates the feasibility of heat transfer enhancement in laminar how using the flow-induced vibration of a microfin array. The microfins are initially bent due to the residual stress difference. In order to characterize the dynamics of the microfin flow-induced vibration, a microfin sensor is fabricated. Increase in air velocity provides larger vibrating deflection, while the vibrating frequency of the microfin is independent of the air velocity. The thermal resistances are measured to evaluate the thermal performance of thr: microfin heat sink and compared with those of a plain-wall heat sink. For a fluid velocity of 4.4 m/s, the thermal resistance of the microfin array heat sink is measured to be 4.45 degreesC/W and that of the plain-wall heat sink to be 4.69 degreesC/W, which indicates a 5.5% cooling enhancement. A; a flow velocity of 5.5 m/s, the thermal resistance of the microfin array heat sink is decreased by 11.5%. From the experimental investigations, it is concluded that the vibrating deflection plays a key role in enhancing the heat transfer rate. (C) 2001 Elsevier Science B.V. All rights reserved
Effects of alcohol hangover on cytokine production in healthy subjects
No full textA hangover is the syndrome of physical and mental symptoms that occurs 8 to 16 h after alcohol consumption with a zero level of alcohol. The aim of the current study was to investigate the effects of the alcohol hangover on cytokine production in healthy subjects. The hangover state was defined as 13 h after drinking 1.5 g/kg of alcohol (blood alcohol level = 0). A venous blood sample was taken from 20 healthy adult men before consumption of alcohol and during the hangover state. Peripheral blood mononuclear cells were separated and stimulated with phytohemagglutinin. An enzyme-linked immunosorbent assay was used to measure the production of the following cytokines: interleukin (IL)-1beta, IL-4, IL-6, IL-10, IL-12, interferon-gamma (IFN-gamma), and tumor necrosis factor-alpha (TNF-alpha). We found that the concentrations of IL-10, IL-12, and IFN-gamma were significantly increased during the hangover state compared with the concentrations in normal conditions. These results support the suggestion that the dysregulated cytokine pathway (IL-10, IL-12, and IFN-gamma) is associated with the symptoms of hangovers. (C) 2003 Elsevier Inc. All rights reserved
Data from: Letting go with the Flow: Directional Abscission of Dandelion Seeds
No full textPlease cite as: Jena Shields, Fiorella Ramirez-Esquivel, Aspen Shih, Yukun Sun, Ravi Sridhar, Chris Roh (2025) Data from: Letting go with the Flow: Directional Abscission of Dandelion Seeds [Dataset] Cornell University Library eCommons Repository. https://doi.org/10.7298/5npb-8c98.2These files contain data supporting the results reported in Shields et. al. Letting go with the Flow: Directional Abscission of Dandelion Seeds.
This software is licensed under the terms of the MIT license.
Licenses/restrictions placed on the data:
This dataset is shared under a Creative Commons 1.0 Universal Public Domain Dedication (https://creativecommons.org/publicdomain/zero/1.0/). The material can be copied, modified and used without permission, but attribution to the original authors is always appreciated.National Science Foundation grant NSF-DGE 1922551 (JS)
National Science Foundation grant NSF-DGE 2139899 (JS)
Cornell Institute for Digital Agriculture Research Innovation Fund (JS)
National Science Foundation grant NSF CMMI-204274 (CR)
National Science Foundation grant NSF-CBET-2442036
This research was supported in part by the intramural research program of the U.S. Department of Agriculture, National Institute of Food and Agriculture, Hatch, and accession #7003645. The findings and conclusions in this preliminary publication have not been formally disseminated by the U.S. Department of Agriculture and should not be construed to represent any agency determination or policy. (CR)
Office of Naval Research Global grants N62909-20-1-2088 (SR) and N62909-23-1-2073 (SR)
Asian Office of Aerospace Research and Development grant FA2386-21-1-4075 (SR
Comparison of Javascript ES6 and its React JS library from the point of view of a beginning developer
No full textThis bachelor thesis deals with the issue of Vanilla JavaScript and its React JS library from the perspective of a beginning developer. The aim of the work is to map in detail, practically demonstrate and then compare the basic principles of selected tools Vanilla JavaScript and React JS. The work consists of three imaginary parts. After defining important terms, the author deals in the first part with the Vanilla JavaScript approach. The given part of the procedure presents important principles of pure JavaScript with the end of the part, which is an example of practical development in this tool. The second part of the work deals with the React JS library in the same way. The given part of the work goes again from the description of theoretical principles to a practical demonstration of the development of a functionally identical application, but this time from the point of view of the React JS tool. In the third and final part of the work, the author theoretically compares the key differences, advantages and disadvantages of the principles in the development of the application in Vanilla JavaScript and the React JS library. This part is then concluded with a final summary of the comparison with a detailed description of the advantages and disadvantages of each approach with a framework recommendation for the use of the solutions in various development situations. After reading the work, the reader should get a comprehensive idea of the possibilities of using the tools in solving specific problems, in such a way that they can choose the right tool in practice to solve the problem.Táto bakalárska práca sa zaoberá problematikou Vanilla JavaScriptu a jeho knižnice React JS z pohľadu začínajúceho vývojára. Cieľom práce je detailne zmapovať, prakticky demonštrovať a následne porovnať základné princípy vybraných nástrojov Vanilla JavaScript a React JS. Práca sa skladá z troch pomyselných častí. Po vymedzení dôležitých pojmov sa autor v prvej časti venuje prístupu Vanilla JavaScriptu. Daná časť postupe predstavuje dôležité princípy čistého JavaScriptu so zakončením časti, ktorá tvorí ukážka praktického vývoja v tomto nástroji. Druhá časť práce sa rovnakým spôsobom venuje knižnici React JS. Daná časť práce prechádza opäť od popisu teoretických princípov až po praktickú ukážku vývoja funkcionálne rovnakej aplikácie, tentokrát však z pohľadu nástroja React JS. V tretej a zároveň záverečnej časti práce autor teoreticky porovnáva kľúčové rozdiely, výhody a nevýhody daných princípov pri vývoji aplikácie vo Vanilla JavaScripte a knižnici React JS. Táto časť je následne ukončená záverečným zhrnutím porovnania s detailným popisom výhod a nevýhod jednotlivých prístupov s rámcovým odporúčaním použitia daných riešení v rôznych situáciách vývoja. Po prečítaní danej práce by mal čitateľ získať komplexnú predstavu o možnostiach využitia daných nástrojov pri riešení konkrétnych problémov, takým spôsobom, aby si pri riešení problému v praxi vedel vybrať ten správny nástroj.Tato bakalářská práce se zabývá problematikou Vanilla JavaScriptu a jeho knihovny React JS z pohledu začínajícího vývojáře. Cílem práce je detailně zmapovat, prakticky demonstrovat a následně porovnat základní principy vybraných nástrojů Vanilla JavaScript a React JS. Práce se skládá ze tří pomyslných částí. Po vymezení důležitých pojmů se autor v první části věnuje přístupu Vanilla JavaScriptu. Daná část postupu představuje důležité principy čistého JavaScriptu se zakončením části, která tvoří ukázka praktického vývoje v tomto nástroji. Druhá část práce se stejným způsobem věnuje knihovně React JS. Daná část práce přechází opět od popisu teoretických principů až po praktickou ukázku vývoje funkcionální stejné aplikace, tentokrát však z pohledu funkce React JS. Ve třetí a zároveň závěrečné části práce autor teoreticky porovnává klíčové rozdíly, výhody a nevýhody daných principů při vývoji aplikace ve Vanilla JavaScriptu a knihovně React JS. Tato část je následně ukončena závěrečným shrnutím srovnání s detailním popisem výhod a nevýhod jednotlivých přístupů s rámcovým doporučením použití daných řešení v různých situacích vývoje. Po přečtení dané práce by měl čtenář získat komplexní představu o možnostech využití daných nástrojů při řešení konkrétních problémů, takovým způsobem, aby si při řešení problému v praxi věděl vybrat ten správný nástroj
Comparison of Javascript ES6 and its React JS library from the point of view of a beginning developer
No full textThis bachelor thesis deals with the issue of Vanilla JavaScript and its React JS library from the perspective of a beginning developer. The aim of the work is to map in detail, practically demonstrate and then compare the basic principles of selected tools Vanilla JavaScript and React JS. The work consists of three imaginary parts. After defining important terms, the author deals in the first part with the Vanilla JavaScript approach. The given part of the procedure presents important principles of pure JavaScript with the end of the part, which is an example of practical development in this tool. The second part of the work deals with the React JS library in the same way. The given part of the work goes again from the description of theoretical principles to a practical demonstration of the development of a functionally identical application, but this time from the point of view of the React JS tool. In the third and final part of the work, the author theoretically compares the key differences, advantages and disadvantages of the principles in the development of the application in Vanilla JavaScript and the React JS library. This part is then concluded with a final summary of the comparison with a detailed description of the advantages and disadvantages of each approach with a framework recommendation for the use of the solutions in various development situations. After reading the work, the reader should get a comprehensive idea of the possibilities of using the tools in solving specific problems, in such a way that they can choose the right tool in practice to solve the problem.Táto bakalárska práca sa zaoberá problematikou Vanilla JavaScriptu a jeho knižnice React JS z pohľadu začínajúceho vývojára. Cieľom práce je detailne zmapovať, prakticky demonštrovať a následne porovnať základné princípy vybraných nástrojov Vanilla JavaScript a React JS. Práca sa skladá z troch pomyselných častí. Po vymedzení dôležitých pojmov sa autor v prvej časti venuje prístupu Vanilla JavaScriptu. Daná časť postupe predstavuje dôležité princípy čistého JavaScriptu so zakončením časti, ktorá tvorí ukážka praktického vývoja v tomto nástroji. Druhá časť práce sa rovnakým spôsobom venuje knižnici React JS. Daná časť práce prechádza opäť od popisu teoretických princípov až po praktickú ukážku vývoja funkcionálne rovnakej aplikácie, tentokrát však z pohľadu nástroja React JS. V tretej a zároveň záverečnej časti práce autor teoreticky porovnáva kľúčové rozdiely, výhody a nevýhody daných princípov pri vývoji aplikácie vo Vanilla JavaScripte a knižnici React JS. Táto časť je následne ukončená záverečným zhrnutím porovnania s detailným popisom výhod a nevýhod jednotlivých prístupov s rámcovým odporúčaním použitia daných riešení v rôznych situáciách vývoja. Po prečítaní danej práce by mal čitateľ získať komplexnú predstavu o možnostiach využitia daných nástrojov pri riešení konkrétnych problémov, takým spôsobom, aby si pri riešení problému v praxi vedel vybrať ten správny nástroj.Tato bakalářská práce se zabývá problematikou Vanilla JavaScriptu a jeho knihovny React JS z pohledu začínajícího vývojáře. Cílem práce je detailně zmapovat, prakticky demonstrovat a následně porovnat základní principy vybraných nástrojů Vanilla JavaScript a React JS. Práce se skládá ze tří pomyslných částí. Po vymezení důležitých pojmů se autor v první části věnuje přístupu Vanilla JavaScriptu. Daná část postupu představuje důležité principy čistého JavaScriptu se zakončením části, která tvoří ukázka praktického vývoje v tomto nástroji. Druhá část práce se stejným způsobem věnuje knihovně React JS. Daná část práce přechází opět od popisu teoretických principů až po praktickou ukázku vývoje funkcionální stejné aplikace, tentokrát však z pohledu funkce React JS. Ve třetí a zároveň závěrečné části práce autor teoreticky porovnává klíčové rozdíly, výhody a nevýhody daných principů při vývoji aplikace ve Vanilla JavaScriptu a knihovně React JS. Tato část je následně ukončena závěrečným shrnutím srovnání s detailním popisem výhod a nevýhod jednotlivých přístupů s rámcovým doporučením použití daných řešení v různých situacích vývoje. Po přečtení dané práce by měl čtenář získat komplexní představu o možnostech využití daných nástrojů při řešení konkrétních problémů, takovým způsobem, aby si při řešení problému v praxi věděl vybrat ten správný nástroj
D3.js platform for visualisation of business data : Graduate paper
No full textRad se bavi izradom internetske aplikacije koja se bavi vizualizacijom poslovnih podataka kroz
d3.js biblioteku. Internetska aplikacija se izrađuje korištenjem D3.js biblioteke koja služi za
manipuliranje dokumenata na temelju podataka. D3 oživljava skupove podataka pomoću
HTML-a, SVG-a i CSS-a kroz koje kombinira moćne komponente vizualizacije i pristup
manipulaciji DOM-om temeljen na podacima. Rad će prikazati korake u izradi internetske
aplikacije koja je izrađena koristeći Visual Studio Code alat. Aplikacija će imati mogućnost
podizanja skupa podataka u formatu .csv datoteke, nakon čega će se korisniku prikazati sve
moguće varijable povučene iz skupa podataka. Korisnik odabire određenu varijable i grafikon
koji želi, nakon čega se ispred korisnika crta grafikon pomoću d3.js biblioteke. Izrada je
podijeljena u dva dijela, frontend i backend. Kako je React.js jedan od najpopularnijih
tehnologija za korisničko sučelje, zbog svoje optimiziranosti i brzine dohvaćanja podataka kroz
React stanja, ova tehnologija će se koristiti u poglavlju frontend. Što se tiče backend dijela,
koristiti će se Node.js tehnologija za poslužitelj, i PostgreSQL kao baza podataka. Uz izradu
aplikacije rad će prikazati skice ciljane aplikacije kako bi se prikazao proces planiranja i izrade
korisničkog sučelja, izrade komponente za React.js tehnologiju kroz koje je napravljeno
korisničko sučelje, izradu poslužitelja i njegove krajnje točke te korištenje baze podataka. Na
kraju rada se prolazi kroz prednosti i nedostatke d3.js biblioteke, te njezin doprinos u
internetskom razvoju.The paper deals with the development of an Internet application that deals with the visualization
of business dana through the D3.js library. The web application is created with D3.js library
which is used to manipulate documents based on dana. D3 brings datasets to life using HMTL,
SVG and CSS through which it combines powerful visualization components and a dana-based
approach to DOM manipulation. The paper will show the steps of creating an Internet
application created using Visual Studio Code tool. The application will have the ability to load
a dataset in a .csv format, after which the user will be shown all possible variables extracted
from the dataset. The user selects a specific variable and the graph he wants, after which a graph
is drawn in front of the user using the d3.js library. The production is divided into two parts,
frontend and backend. As React.js is one of the most popular user interface technologies, due
to its optimization and speed of retrieving dana through React states, this technology will be
use din the frontend chapter. As for the backend part, Node.js technology will be used, and
PostgreSQL as the database. In addition to creating the application, the paper will present
mockups of the target application to show the process of planning and creating the user
interface, creating a component for React.js technology through which the user interface is
made, creating the server and its endpoints, and using the database. At the end of the paper, we
go through the advantages and disadvantages of the d3.js library, and its contribution to Internet
development
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