Hydrous Manganese Oxide Doped Gel Probe Sampler for Measuring In Situ Reductive Dissolution Rates. 1. Laboratory Development

Reductive dissolution of redox-sensitive minerals such as manganese (Mn) oxides in natural sediments is an important mechanism for trace element mobilization into groundwater. A gel probe sampler has been constructed to study in situ reductive dissolution of Mn oxides. The gel consists of a polyacrylamide polymer matrix doped with hydrous Mn oxide (HMO). Gel slabs are mounted into a probe, which is designed to be inserted into the sediments. The amount of Mn released from the gel by reductive dissolution is determined by comparing the amount of Mn initially embedded into the gel with the amount remaining in the gel after exposure to conditions in the sediments or, in laboratory studies, to reducing agents. In this laboratory study, the performance of the gel probes was examined using the model reductant ascorbate and the Mn-reducing bacteria Shewanella oneidensis strain MR-1. In addition, a 1-D model was used to relate the reaction rates observed for HMO embedded in gels to those for HMO in suspension. One limitation of the HMO-doped gels for assessing microbial reduction rates is that the gels prevent direct contact between the microbes and the HMO and hence preclude enzymatic reduction at the cell surface. Nonetheless, the HMO-doped gel probes offer the possibility to establish a lower bound for Mn-reduction capacity in sediments

Space simulation and radiative property testing system and method Patent

Development of method and equipment for testing heat radiative properties of material under controlled environmental condition

Experimental investigations in epitaxial growth of crystalline layers final report

Epitaxial growth of crystalline layer

Development of an image converter of radical design

A long term investigation of thin film sensors, monolithic photo-field effect transistors, and epitaxially diffused phototransistors and photodiodes to meet requirements to produce acceptable all solid state, electronically scanned imaging system, led to the production of an advanced engineering model camera which employs a 200,000 element phototransistor array (organized in a matrix of 400 rows by 500 columns) to secure resolution comparable to commercial television. The full investigation is described for the period July 1962 through July 1972, and covers the following broad topics in detail: (1) sensor monoliths; (2) fabrication technology; (3) functional theory; (4) system methodology; and (5) deployment profile. A summary of the work and conclusions are given, along with extensive schematic diagrams of the final solid state imaging system product

Mutuality of Obligation in Contract Law

No field of law study, certainly none in the first-year curriculum, is richer in leitmotif than is that of contracts. Much of the challenge to the beginning student lies in untangling these recurrent themes, such as bargain, reasonable expectations and reliance, to take but a few. In the following pages I shall attempt to unravel one such theme that is of contemporary significance in the development of contract law-that of mutuality of obligation. The principle of mutuality of obligation can be simply stated: If two parties are to be bound by an exchange of promises, neither one is bound until the other is bound. We are going to look at the erosion of this principle in modern contract law. But first, a little whimsy may provide some insight into the principle itself. Let your imagination carry you back over a century to Friday, June 12, 1874