230,737 research outputs found
La historia del derecho romano de Castillejo. A propósito de su reimpresión.
No full textLa autora aborda el estado de la enseñanza del derecho romano en el primer tercio del siglo XX en las facultades de derecho de España y su relación con otros países occidentales. Toma como pretexto para sus notas la reedición de la histona del derecno
romano publicada en 1935 por Castillejo.The author describes the standing of Roman law teaching in Spanish law schools during the first part of the XX century and how it relates with its teachig in other western countries. She bases her discussion of this topic on a new edition ot Castillejo
1935 book, The History of Román Law.Publicad
Models for silicate melts viscosity
No full textD. Giordano (1,2), J.K. Russell (2), R. Moretti (3), A. Mangiacapra (3,4), M.
Potuzàk (4), C. Romano (1) & D.B. Dingwell (4
3D Photogrammetric model of Tapinocaninus pamelae
No full text3D photogrammetric model of Tapinocaninus pamelae. Supplementary Material of the paper:
Rubidge B., Govender R., & Romano M. The postcranial skeleton of the basal tapinocephalid dinocephalian
Tapinocaninus pamelae (Synapsida: Therapsida) from the South African Karoo Supergroup. Journal of Systematic Palaeontology
Multimodal retinal imaging of m.3243A>G associated retinopathy
No full textRetro-mode illumination imaging can provide good visualization of chorio-retinal atrophy and of the retinal pigment epithelial alterations occurring in m.3243A > G associated retinopathy
Intern experience at CH���M Hill, Inc.: an internship report
No full textIncludes author's vita"Submitted to the College of Engineering of Texas A&M University in partial
fulfillment of the requirement for the degree of Doctor of Engineering."Includes bibliographical referencesA review of the author's internship experience with CH���M HILL, Inc.
during the period September 1975 through May 1976 is presented. During this nine month
internship the author worked as an Engineer II in the Industrial Processes discipline of this
large consulting engineering firm... The author's prime responsibility was as one of three
lead design engineers on the design of a large wastewater treatment facility for a pulp mill
in Hoquiam, Washington owned by ITT Rayonier Inc. The work generally consisted of the design
of individual treatment units and associated piping and pumping. The purpose of the project
was to provide wastewater treatment capabilities that would satisfy the effluent limitations
(standards) imposed upon the mill by the State of Washington Department of Ecology and the
U.S. Environmental Protection Agency. The author's assignment also entailed necessary
interaction with the project manager and other CH���M HILL design engineers and support staff
members, the client's representatives, and representatives of two other consulting engineering
firms working on the project. Thus, the internship position at CH���M HILL provided considerable
experience coordinating the author's work with the work of other engineers, guiding the design
and administrative efforts of a support staff, and interacting regularly with the client and
other consulting firms. This broad exposure to a variety of engineering and organizational
problems provided a valuable educational experience
Geophysical researches to detect karst caves in the main polje of Apulia
No full textCanale di Pirro, the main polje in Apulia, extends for 12 km in the Low Murge karst area. It hosts the deepest cave in the region, reaching the depth of −324 m.
Geophysical analyses have been performed in correspondence of two sites of interest. The first is located about 0.5 km upstream of the cave and is the main swallow hole in the polje. During rainstorms, most of the water accumulated in this sector is drained at this site, with time of absorption ranging from a few hours to some days, in function of the saturation condition of the sediments. The
survey was addressed to verify the existence of caves, and the possibility to open a passage in the cover deposits. By adopting a multi-array and multi-scale strategy, based on the acquisition and joint inversion of geoelectrical data
collected by using different arrays and with electrode spacing ranging from 5 to 20 m, a high-resolution model of the electrical subsurface structure was obtained. With an investigation depth up to *150 m below the ground and
high surficial resolution, the model shows features compatible with the presence of large caves, providing useful information on their possible extension and the thickness of the cover deposits. The second site is a small sinkhole (3 m depth, 7 m diameter) within a vineyard in the eastern sector of the polje. The survey was addressed to detect likely ways of water infiltration at the site and possible
presence of underground voids
Simulation of thermal plant optimization and hydraulic aspects of thermal distribution loops for large campuses
No full textFollowing an introduction, the author describes Texas A&M University and its utilities system. After that, the author presents how to construct simulation models for chilled water and heating hot water distribution systems. The simulation model was used in a $2.3 million Ross Street chilled water pipe replacement project at Texas A&M University. A second project conducted at the University of Texas at San Antonio was used as an example to demonstrate how to identify and design an optimal distribution system by using a simulation model. The author found that the minor losses of these closed loop thermal distribution systems are significantly higher than potable water distribution systems. In the second part of the report, the author presents the latest development of software called the Plant Optimization Program, which can simulate cogeneration plant operation, estimate its operation cost and provide optimized operation suggestions. The author also developed detailed simulation models for a gas turbine and heat recovery steam generator and identified significant potential savings. Finally, the author also used a steam turbine as an example to present a multi-regression method on constructing simulation models by using basic statistics and optimization algorithms. This report presents a survey of the author??s working experience at the Energy Systems Laboratory (ESL) at Texas A&M University during the period of January 2002 through March 2004. The purpose of the above work was to allow the author to become familiar with the practice of engineering. The result is that the author knows how to complete a project from start to finish and understands how both technical and nontechnical aspects of a project need to be considered in order to ensure a quality deliverable and bring a project to successful completion. This report concludes that the objectives of the internship were successfully accomplished and that the requirements for the degree of Degree of Engineering have been satisfied
Il potenziale formale della coppia Ti(IV,III) a 25°C nel mezzo HCl 1 M NaCl 2 M
No full textNell’ambito delle diverse coppie ossidoriduttive di un elemento in soluzione acquosa, vengono indicate come ipoossidate le specie appartenenti a quelle coppie il cui potenziale standard è inferiore a quello di riduzione dell’acqua ad idrogeno, e come iperossidate le specie che fanno parte di coppie con valore del potenziale di riduzione superiore a quello dell’ossigeno ad acqua. Si tratta in entrambi i casi di specie termodinamicamente poco stabili che si trasformano rispettivamente nella forma ossidata con evoluzione di idrogeno e nella forma ridotta con evoluzione di ossigeno. Tali processi sono modulati dall’attività idrogenionica della soluzione (Figura 1).
Figura 1. Intervallo di stabilità termodinamica dell’acqua
La decomposizione di queste specie da parte dell’acqua, spesso catalizzata dagli stessi elettrodi metallici delle celle utilizzate per la misura dei potenziali redox, introduce una rilevante fonte di incertezza sulla composizione delle soluzioni; a questa si aggiunge l’incertezza dovuta alla presenza di giunzioni liquide, di impurezze nei mezzi ionici, alla mancanza di controllo dei coefficienti di attività. Tutto ciò ha come effetto le rilevanti differenze riscontrabili in letteratura tra i pochi valori riportati per i potenziali redox di tali sistemi.
Alcune di queste coppie con specie ipo o iperossidate (Ag2+, Co3+ , Ce4+ , Cr2+ , V2+, U3+ , Yb2+) sono state studiate nel nostro laboratorio e, i relativi valori dei potenziali redox in cui sono coinvolte, misurati [1-7]. Funzionale in questi studi è stata la diminuzione in alcuni casi della temperatura delle soluzioni (-5°C) così da ottenere una significativa attenuazione dell’azione di decomposizione esercitata dall’acqua.
Con riferimento a quanto appena detto, si è intrapreso lo studio della coppia redox (IV,III) del titanio, che nella forma di ione titanoso, Ti3+, in particolare sotto forma di cloruro o solfato, presenta numerose applicazioni analitiche [8]. D’altra parte, per le sue proprietà di elevata resistenza, il titanio metallico trova applicazioni tecnologiche che spaziano dalle leghe speciali, ai pigmenti bianchi, alla realizzazione di protesi ortopediche. Sulla base dell’esperienza acquisita, ci siamo proposti di determinare il potenziale redox della coppia Ti(IV, III), anche perché i valori riportati in soluzione acquosa per tale grandezza risultano notevolmente differenti [9-11].
L’indagine è stata effettuata con due metodi differenti: nel primo, per ottenere la miscela dei due stati di ossidazione, si è utilizzata l’ossidazione del Ti(III) a Ti(IV) per elettrolisi controllata (titolazioni coulombometriche) seguita dalla misura in situ della fem della cella senza giunzione
+ GE | Soluzione S | Hg - GE = Elettrodo a vetro
Nel secondo metodo, la specie ipoossidata Ti(III) è stata ottenuta per riduzione del Ti(IV) con amalgama di zinco (batch) seguita da determinazione potenziometrica, analoga alla precedente. Le due metodiche indipendenti hanno fornito valori del potenziale cercato in ottimo accordo, precisamente:
Metodo coulombometrico Ef = 9 + 1 mV
Metodo batch Ef = 9 + 2 mV
Riferimenti bibliografici
1. Biedermann G, Maggio F, Romano V, Zingales R. Acta Chem. Scand. 1981; A35: 287.
2. Biedermann G, Orecchio S, Romano V, Zingales R. Acta Chem. Scand. 1986; A40:161
3. Zingales R. J. Chem. Soc. Dalton Trans 1990; 229
4. Biedermann G, Romano V. Acta Chem. Scand. 1975; A35: 615
5. Fiore M, Orecchio S, Romano V, Zingales R. J. Chem. Soc. Dalton Trans 1993; 799
6. Orecchio S, Piazzese D, Romano V, Zingales R. Ann. Chim. 1988; 88: 129
7. Amorello D, Romano V, Zingales R. Ann. Chim. 2004; 94 :113
8. Vogel A I Textbook of Quantitative Inorganic Analysis, Longmans 1961; 329
9. Kolthoff I M, Rec. Trav. Chim. Pays-Bas, 1924; 43 , 768
10. Boch R and Greiner G, Z. Anorg. Chem., 1958; 295 ,61
11. Lingane J J Anal. Chem. 1958 20 79
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