Preliminary results of geothermal desalting operations at the East Mesa test site Imperial Valley, California

The Bureau of Reclamation has erected at its Geothermal Resource Development site two experimental test vehicles for the purpose of desalting hot fluids of geothermal origin. Both plants have as a feed source geothermal well Mesa 6-1 drilled to a total depth of 8,030 feet and having a bottom hole temperature of 400 F. Formation fluid collected at the surface contained 24,800 mg/1 total dissolved solids. The dissolved solids consist mainly of sodium chloride. A multistage distillation (3-stage) plant has been operated intermittently for one year with no operational problems. Functioning at steady-state conditions with a liquid feed rate of 70 g/m and a temperature of 221 F, the final brine blowdown temperature was 169 F. Product water was produced at a rate of about 2 g/m; average total dissolved solids content of the product was 170 mg/1. A product quality of 27.5 mg/1 at a pH of 9.5 was produced from the first stage

An Interactive Model of Teaching

Previous teaching models in the learning theory community have been batch models. That is, in these models the teacher has generated a single set of helpful examples to present to the learner. In this paper we present an interactive model in which the learner has the ability to ask queries as in the query learning model of Angluin [1]. We show that this model is at least as powerful as previous teaching models. We also show that anything learnable with queries, even by a randomized learner, is teachable in our model. In all previous teaching models, all classes shown to be teachable are known to be efficiently learnable. An important concept class that is not known to be learnable is DNF formulas. We demonstrate the power of our approach by providing a determinstic teacher and learner for the class of DNF formulas. The learner makes only equivalence queries and all hypotheses are also DNF formulas

Learning and Teaching of Boolean and Geometric Classes

We consider the concept classes of DNF formulas and unions of discretized, axis-parallel d-dimensional boxes in discretized d-dimensional space with respect to several different learning models. In the model of learning with queries we present an algorithm to learn unions of boxes. We introduce a model of teaching that prevents illicit communication between the teacher and the leaner but that captures the intuitive aspect of teaching: a learner should perform at least as well with a cooperative teacher as with an adversarial teacher. We propose the study of teaching of DNF formulas and unions of boxes in this model. We also propose a study of a teaching model in which the learner may be randomized. It is currently unclear if randomization of the learner allows teaching of classes that are unteachable in the current teaching model

Immigration and Status Exchange in Australia and the United States

The claim that marriage is a venue for status exchange of achieved traits, like education, and ascribed attributes, notably race and ethnic membership, has regained traction in the social stratification literature. Most studies that consider status exchanges ignore birthplace as a social boundary for status exchanges via couple formation. This paper evaluates the status exchange hypothesis for Australia and the United States, two Anglophone nations with long immigration traditions whose admission regimes place different emphases on skills. A loglinear analysis reveals evidence of status exchange in the United States among immigrants with lower levels of education and mixed nativity couples with foreign-born husbands. Partly because Australian educational boundaries are less sharply demarcated at the postsecondary level, we find is weaker evidence for the status exchange hypothesis. Australian status exchanges across nativity boundaries usually involve marriages between immigrant spouses with a postsecondary credential below a college degree and native-born high school graduates.Status exchange, immigration, educational assortative mating

Immigration and Status Exchange in Australia and the United States

The claim that marriage is a venue for status exchange of achieved traits, like education, and ascribed attributes, notably race and ethnic membership, has regained traction in the social stratification literature. Most studies that consider status exchanges ignore birthplace as a social boundary for status exchanges via couple formation. This paper evaluates the status exchange hypothesis for Australia and the United States, two Anglophone nations with long immigration traditions whose admission regimes place different emphases on skills. A log-linear analysis reveals evidence of status exchange in the United States among immigrants with lower levels of education and mixed nativity couples with foreign-born husbands. Partly because Australian educational boundaries are less sharply demarcated at the postsecondary level, we find is weaker evidence for the status exchange hypothesis. Australian status exchanges across nativity boundaries usually involve marriages between immigrant spouses with a postsecondary credential below a college degree and native-born high school graduates.

Remote Detection of Saline Intrusion in a Coastal Aquifer Using Borehole Measurements of Self-Potential

Funded by NERC CASE studentship . Grant Number: NE/I018417/1Peer reviewedPublisher PD

Immigration and Status Exchange in Australia and the United States

The claim that marriage is a venue for status exchange of achieved traits, like education, and ascribed attributes, notably race and ethnic membership, has regained traction in the social stratifi cation literature. Most studies that consider status exchanges ignore birthplace as a social boundary for status exchanges via couple formation. This paper evaluates the status exchange hypothesis for Australia and the United States, two Anglophone nations with long immigration traditions whose admission regimes place diff erent emphases on skills. A log-linear analysis reveals evidence of status exchange in the United States among immigrants with lower levels of education and mixed nativity couples with foreign-born husbands. Partly because Australian educational boundaries are less sharply demarcated at the postsecondary level, we fi nd weaker evidence for the status exchange hypothesis. Australian status exchanges across nativity boundaries usually involve marriages between immigrant spouses with a postsecondary credential below a college degree and native-born high school graduates.Status exchange; immigration; educational assortative mating