Pub Date : 1957-12-31DOI: 10.1515/9783110608144-093
A. Mohamed, D. Chenaf, S. El-Shahed
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{"title":"B","authors":"A. Mohamed, D. Chenaf, S. El-Shahed","doi":"10.2307/j.ctv9zck1m.8","DOIUrl":"https://doi.org/10.2307/j.ctv9zck1m.8","url":null,"abstract":"","PeriodicalId":275113,"journal":{"name":"DARE’s Dictionary of Environmental Sciences and Engineering","volume":"185 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1921-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125837699","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1904-12-31DOI: 10.1515/9783110580389-065
A. Mohamed, D. Chenaf, S. El-Shahed
Novel Uracil-modified chitosan (UCs) adsorbent has successfully been synthesized through a four-step method during which the amino groups of chitosan have been protected, then epoxy nuclei have been incorporated, afterwards the latter have been opened using 6-amino-1,3dimethyl uracil, and finally the amino groups have been regained via removing the protection. Its structure was checked using FTIR, XRD and SEM techniques. The adsorption capacity of UCs for anionic Congo Red (CR) dye was studied under various conditions. It decreased significantly with increasing the solution pH value and dye concentration, while increased with increasing temperature. The adsorption of UCs for CR dye at different temperatures, solution pH and dye concentrations fitted to the kinetic model of pseudo-second order and Elovich model. The intraparticle diffusion model showed that the adsorption process involves multi-step process. The isotherm of CR dye adsorption by UCs conforms to the Langmuir isotherm model indicating the monolayer nature of adsorption. The maximum monolayer coverage capacity, qmax, was 434.78 mg g−1. Studying the thermodynamic showed that the adsorption of CR dye onto UCs was endothermic as illustrated from the positive value of enthalpy (21.37 kJ mol−1). According to the values of ΔG°, the adsorption process was spontaneous at all selected temperatures. The value of ΔS° showed an increase in randomness for the adsorption of CR dye by UCs. The value of activation energy was 18.40 kJ mol−1.
{"title":"S","authors":"A. Mohamed, D. Chenaf, S. El-Shahed","doi":"10.1515/9783110580389-065","DOIUrl":"https://doi.org/10.1515/9783110580389-065","url":null,"abstract":"Novel Uracil-modified chitosan (UCs) adsorbent has successfully been synthesized through a four-step method during which the amino groups of chitosan have been protected, then epoxy nuclei have been incorporated, afterwards the latter have been opened using 6-amino-1,3dimethyl uracil, and finally the amino groups have been regained via removing the protection. Its structure was checked using FTIR, XRD and SEM techniques. The adsorption capacity of UCs for anionic Congo Red (CR) dye was studied under various conditions. It decreased significantly with increasing the solution pH value and dye concentration, while increased with increasing temperature. The adsorption of UCs for CR dye at different temperatures, solution pH and dye concentrations fitted to the kinetic model of pseudo-second order and Elovich model. The intraparticle diffusion model showed that the adsorption process involves multi-step process. The isotherm of CR dye adsorption by UCs conforms to the Langmuir isotherm model indicating the monolayer nature of adsorption. The maximum monolayer coverage capacity, qmax, was 434.78 mg g−1. Studying the thermodynamic showed that the adsorption of CR dye onto UCs was endothermic as illustrated from the positive value of enthalpy (21.37 kJ mol−1). According to the values of ΔG°, the adsorption process was spontaneous at all selected temperatures. The value of ΔS° showed an increase in randomness for the adsorption of CR dye by UCs. The value of activation energy was 18.40 kJ mol−1.","PeriodicalId":275113,"journal":{"name":"DARE’s Dictionary of Environmental Sciences and Engineering","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1904-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130860791","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1900-01-01DOI: 10.1201/9781003211396-14
A. Mohamed, D. Chenaf, S. El-Shahed
We extend the main results obtained by Iwaniec and Onninen in Memoirs of the AMS (2012). Inthispaper,wesolvethe (ρ, n ) -energyminimizationproblemforSobolevhomeomorphisms between two concentric annuli in the Euclidean space R n . Here ρ is a radial metric defined in the image annulus. The key element in the proofs is the solution to the Euler–Lagrange equation for a radial harmonic mapping. This is a new contribution on the topic related to the famous J. C. C. Nitsche conjecture on harmonic mappings between annuli on the complex plane. Namely we prove that the minimum of (ρ, n ) -energy of diffeomorphisms between annuli is attained by a certain (ρ, n ) -harmonic diffeomorphisms if and only if the original annulus can be mapped onto the image annulus by a radial (ρ, n ) -harmonic diffeomorphisms and the last fact is equivalent with a certain inequality for annuli which we call a generalized J. C. C. Nitsche type inequality.
我们扩展了Iwaniec和Onninen在《AMS回忆录》(2012)中获得的主要结果。本文解决了欧几里德空间R n中两个同心环空间的索波同胚的(ρ， n) -能量最小化问题。这里ρ是在图像环中定义的径向度规。证明的关键是径向调和映射的欧拉-拉格朗日方程的解。这是对著名的J. C. C. Nitsche关于复平面上环空间调和映射猜想的一个新贡献。也就是说，我们证明了环空之间的(ρ， n) -微分同态能量的最小值是通过一个(ρ， n) -调和微分同态得到的，当且仅当原始环空可以通过一个径向(ρ， n) -调和微分同态映射到像环空上，最后一个事实等价于环空的一个不等式，我们称之为广义的J. C. C. Nitsche型不等式。
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{"title":"C","authors":"A. Mohamed, D. Chenaf, S. El-Shahed","doi":"10.1201/9781003211396-3","DOIUrl":"https://doi.org/10.1201/9781003211396-3","url":null,"abstract":"","PeriodicalId":275113,"journal":{"name":"DARE’s Dictionary of Environmental Sciences and Engineering","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124225998","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1900-01-01DOI: 10.1201/9781003211396-10
A. Mohamed, D. Chenaf, S. El-Shahed
{"title":"J","authors":"A. Mohamed, D. Chenaf, S. El-Shahed","doi":"10.1201/9781003211396-10","DOIUrl":"https://doi.org/10.1201/9781003211396-10","url":null,"abstract":"","PeriodicalId":275113,"journal":{"name":"DARE’s Dictionary of Environmental Sciences and Engineering","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126425812","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1900-01-01DOI: 10.1201/9781003211396-26
A. Mohamed, D. Chenaf, S. El-Shahed
{"title":"Z","authors":"A. Mohamed, D. Chenaf, S. El-Shahed","doi":"10.1201/9781003211396-26","DOIUrl":"https://doi.org/10.1201/9781003211396-26","url":null,"abstract":"","PeriodicalId":275113,"journal":{"name":"DARE’s Dictionary of Environmental Sciences and Engineering","volume":"33 1-2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133785449","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1900-01-01DOI: 10.1201/9781003211396-21
A. Mohamed, D. Chenaf, S. El-Shahed
Selezione pubblica, per titoli e colloquio, per il reclutamento di n. 1 ricercatore con rapporto di lavoro subordinato a tempo determinato, per la durata di anni tre, ai sensi dell’art. 24, comma 3, lett. a) della Legge n. 240/2010, per lo svolgimento di attività di ricerca, di didattica, di didattica integrativa e di servizio agli studenti, per il settore concorsuale 05/E3 BIOCHIMICA CLINICA E BIOLOGIA MOLECOLARE CLINICA, settore scientifico disciplinare BIO/12 BIOCHIMICA CLINICA E BIOLOGIA MOLECOLARE CLINICA, Dipartimento di Medicina Molecolare e Biotecnologie Mediche (codice identificativo – C07_RTDA_2021).
{"title":"U","authors":"A. Mohamed, D. Chenaf, S. El-Shahed","doi":"10.1201/9781003211396-21","DOIUrl":"https://doi.org/10.1201/9781003211396-21","url":null,"abstract":"Selezione pubblica, per titoli e colloquio, per il reclutamento di n. 1 ricercatore con rapporto di lavoro subordinato a tempo determinato, per la durata di anni tre, ai sensi dell’art. 24, comma 3, lett. a) della Legge n. 240/2010, per lo svolgimento di attività di ricerca, di didattica, di didattica integrativa e di servizio agli studenti, per il settore concorsuale 05/E3 BIOCHIMICA CLINICA E BIOLOGIA MOLECOLARE CLINICA, settore scientifico disciplinare BIO/12 BIOCHIMICA CLINICA E BIOLOGIA MOLECOLARE CLINICA, Dipartimento di Medicina Molecolare e Biotecnologie Mediche (codice identificativo – C07_RTDA_2021).","PeriodicalId":275113,"journal":{"name":"DARE’s Dictionary of Environmental Sciences and Engineering","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129099581","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"D","authors":"A. Mohamed, D. Chenaf, S. El-Shahed","doi":"10.1201/9781003211396-4","DOIUrl":"https://doi.org/10.1201/9781003211396-4","url":null,"abstract":"","PeriodicalId":275113,"journal":{"name":"DARE’s Dictionary of Environmental Sciences and Engineering","volume":"322 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115918677","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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