Embedded librarianship and problem-based learning in undergraduate mathematics courses

A pedagogical approach of problem-based learning with embedded librarianship in several undergraduate mathematics courses is implemented in this educational research. The students are assigned to work on several projects on various applications of mathematical topics in daily life and submit written reports. An embedded librarian collaborates together with the instructor and the students to improve the students' information literacy. Initial reaction and anecdotal evidence show that the students' information literacy and academic performance have improved throughout the semesters.Comment: 4 pages, 2 tables, International Congress of Women Mathematicians Presentation Book, Ewha Womans University, Seoul, South Korea, pp. 117-120, 201

Terrestrial cooling and solar variability

Observational evidence from surface temperature records is presented and discussed which suggests a significant cooling trend over the Northern Hemisphere from 1940 to the present. This cooling trend is associated with an increase of the latitudinal gradient of temperature and the lapse rate, as predicted by climate models with decreased solar input and feedback mechanisms. Evidence suggests that four of these 80- to 100-year cycles of global surface temperature fluctuation may have occurred, and in succession, from 1600 to the present. Interpretation of sunspot activity were used to infer a direct thermal response of terrestrial temperature to solar variability on the time scale of the Gleissberg cycle (90 years, an amplitude of the 11-year cycles). A physical link between the sunspot activity and the solar parameter is hypothesized. Observations of sensible heat flux by stationary planetary waves and transient eddies, as well as general circulation modeling results of these processes, were examined from the viewpoint of the hypothesis of cooling due to reduced insolation

Changing Conceptions and Uses of Computer Technologies in the Everyday Literacy Practices of Sixth and Seventh Graders

This study focused on 189 sixth and seventh graders in two large suburban schools and their use of computer technologies as part of their everyday literacy practices. We were especially interested in the students\u27 conceptions of computer technologies and how computer use varied across grade and reading levels. The study included a survey completed by all 189 students that provided an overview of students\u27 uses of computer technologies and other literacy practices. Interviews with 24 students provided more detailed information on how sixth- and seventh-grade students at different reading levels used and conceptualized computer technologies in and out of school. Findings showed that many students, especially sixth graders, were far less interested in computer technologies than is suggested by common conceptions. Findings also showed an important shift between sixth and seventh graders toward more interest in practices that provided social interaction or entertainment. Some of the conceptions these students held about computer technologies could be attributed to changing social and developmental needs, but a variety of factors, such as literacy skills and contexts of use, influenced these students as well

Indirect objects and incorporation in Mazatec

From the introduction: This paper deals with indirect objects in Mazatec. It has two fairly modest goals. The first is to describe the superficial characteristics of indirect objects in Mazatec. We claim that they occur as prepositional phrases which are obligatorily incorporated into the verb (in a specific way described below). The second goal is to describe the constructions in which indirect objects occur in Mazatec. We do this primarily within the framework of Relational Grammar (Perlmutter 1983a, Perlmutter and Rosen 1984), claiming that indirect objects occur in simple clauses and also in clauses with Benefactive-3 Advancement, 2-3 Retreat (personal and impersonal), and (impersonal) Inversion. 3-chomeurs, which sometimes occur, are marked differently from final indirect objects. All of these claims are novel for Mazatec. In addition, this is the first time for which such constructions have been posited for any Otomanguean language

Annual Survey of Virginia Law: Environmental Law

This article addresses significant developments in Virginia law pertaining to air quality, water quality and solid and hazardous waste which have occurred between the publication of the 1990 survey and May 1, 1992

Assessing the Formation of Ungrouped Achondrite Northwest Africa 8186: Residue, Crystallization Product, or Recrystallized Chondrite?

The recent discoveries of primitive achondrites, metachondrites, and type 7 chondrites challenge the long held idea that all chondrites and achondrites form on separate parent bodies. These meteorites have experienced metamorphic temperatures above petrologic type 6 and have partially melted to various degrees. However, because of their isotopic and compositional similarities to both undifferentiated and differentiated groups, the provenance of these 'type 6+' meteorites remains largely unknown. CK and CV chondrites have recently been linked to a few achondrites due to their strong compositional, mineralogical, and isotopic similarities], suggesting a common origin between these meteorites. Although CVs have generally undergone low degrees of alteration near petrologic type 3, CKs have experienced a wide range of thermal alteration from petrologic type 3 to 6. Thermal evolution models on early accreting bodies predict that an early forming body can partially differentiate due to radiogenic heating, and, as a result, form radial layers of material increasing in thermal grade (types 3 to 6+) from the unmelted chondritic surface towards the differentiated core.Northwest Africa (NWA) 8186 is an ungrouped achondrite that provides compelling evidence for higher degrees of thermal processing and/or melting and differentiation on some CK/CV parent bodies. NWA 8186 plots on the CCAM line on a 3-oxygen isotope diagram directly with CK and CV chondrites and also plots with the CKs in regards to Cr isotopes. This meteorite is dominated by Nickel(II)Oxygen-rich olivine (less than 80%), lacks iron metal, and contains four oxide phases, indicating a high fOxygen (above FMQ) similar to the CKs. Additionally, NWA 8186 does not contain chondrules. We have further investigated the origins of NWA 8186 by examining and comparing the bulk composition of this CK-like achondrite with CK and CV chondrites, allowing us to assess the various scenarios in which NWA 8186 may have formed from CK/CV precursor material

Compositions of Magmatic and Impact Melt Sulfides in Tissint And EETA79001: Precursors of Immiscible Sulfide Melt Blebs in Shergottite Impact Melts

Immiscible sulfide melt spherules are locally very abundant in shergottite impact melts. These melts can also contain samples of Martian atmospheric gases [1], and cosmogenic nuclides [2] that are present in impact melt, but not in the host shergottite, indicating some components in the melt resided at the Martian surface. These observations show that some regolith components are, at least locally, present in the impact melts. This view also suggests that one source of the over-abundant sulfur in these impact melts could be sulfates that are major constituents of Martian regolith, and that the sulfates were reduced during shock heating to sulfide. An alternative view is that sulfide spherules in impact melts are produced solely by melting the crystalline sulfide minerals (dominantly pyrrhotite, Fe(1-x)S) that are present in shergottites [3]. In this abstract we report new analyses of the compositions of sulfide immiscible melt spherules and pyrrhotite in the shergottites Tissint, and EETA79001,507, and we use these data to investigate the possible origins of the immiscible sulfide melt spherules. In particular, we use the metal/S ratios determined in these blebs as potential diagnostic criteria for tracking the source material from which the numerous sulfide blebs were generated by shock in these melts

Solvent-induced expansion of dried-demineralized dentin matrix

Abstract no. 249published_or_final_versio

Solvent-induced shrinkage of moist demineralized dentin

Abstract no. 117published_or_final_versio

Reassessing the Formation of CK7 Northwest Africa (NWA) 8186

The classification of meteorites is commonly determined using isotopes, modal mineralogy, and bulk compositions [1]. Bulk rare earth elements (REEs) in meteorites are additionally utilized to understand parent body processes. Numerous authors have shown that chondritic groups exhibit REE patterns that may be attributable to their parent bodies [e.g. 2-4], and variations in abundances and concentrations of REEs may reflect early nebular processes, thermal metamorphism, and aqueous alteration on the parent body [5-6]