Demonstration of combined zero-valent iron and electrical resistance heating for in situ trichloroethene remediation

The effectiveness of in situ treatment using zero-valent iron (ZVI) for nonaqueous phase or significant sediment-associated contaminant mass can be limited by relatively low rates of mass transfer to bring contaminants in contact with the reactive media. For a field test in a trichloroethene (TCE) source area, combining moderate-temperature subsurface electrical resistance heating with in situ ZVI treatment was shown to accelerate TCE treatment by a factor of about 4 based on organic daughter products and a factor about 8 based on chloride concentrations. A mass-discharge-based analysis was used to evaluate reaction, dissolution, and volatilization processes at ambient groundwater temperature (~10 °C) and as temperature was increased up to about 50 °C. Increased reaction and contaminant dissolution were observed with increased temperature, but vapor- or aqueous-phase migration of TCE out of the treatment zone was minimal during the test because reactions maintained low aqueous-phase TCE concentrations.     

建构 现实性的戏剧与建筑戏剧的真相

文章讨论了建构与技术、与人的身体的关系,揭示了现代主义以来建构概念所面临的威胁。通过对建构概念历史发展的回顾,作者指出建构概念本身亦应随时代变化而加以充实,现代主义对自由的追求在本质上与古老的建构概念并不矛盾,建构所展现的真实是一种表象,是对真实的诠释,是转译而非简单的赤裸裸的直陈。     

Der Einfluß der Feldlinien auf Divergenz und Rotor

Ohne ZusammenfassungMit 3 Textabbildungen     

Rundschau

Ohne Zusammenfassung     

Rundschau

Ohne Zusammenfassung     

Mikroskopische Untersuchung g?nzlich verkohlter vorgeschichtlicher Nahrungsmittel aus Tirol

Ohne Zusammenfassung     

Verdrehung von Stäben mit einseitig-ringförmigem Querschnitt

Ohne Zusammenfassung VDI Die Arbeit ist im Mechanisch-technischen Laboratorium der Technischen Hochschule München entstanden. Herrn Prof. Dr.L. F?ppl, dem Leiter dieses Laboratoriums, bringe ich für seine Anregungen und seine Anteilnahme meinen w?rmsten Dank zum Ausdruck.     

INDUSTRIAL USES OF RUBBER1

A discussion of rubber-lined steel tanks for the purpose of storing and transporting muriatic acid and other corrosives is presented. Rubber-lined steel pipe, valves, and fittings for the transportation of corrosives, and the rubber cutless bearing are discussed.