The opening of the Tasmanian Gateway drove global Cenozoic paleoclimatic and paleoceanographic changes: Results of Leg 189

Among the greatest successes of the Ocean Drilling Program were the concerted drilling efforts and exciting results recovered from the Southern Ocean (SO) surrounding Antarctica. Scientific drilling in the SO and on the Antarctic margin has recovered material from hundreds of sites for scientific analysis. The dynamic nature of ice sheet development and ice/margin interactions through time has been observed, as has the role that the SO plays in the development and persistence of Antarctic glaciation. The SO has been documented as a sensitive mixing pool of global water masses that is at times a locus of high biological sedimentation. Also, the SO has been found to contain high‐resolution records of climate forcing and response, and as such it may hold clues to future climate

Learning in virtual worlds : Using communities of practice to explain how people learn from play

Although there is interest in the educational potential of online multiplayer games and virtual worlds, there is still little evidence to explain specifically what and how people learn from these environments. This paper addresses this issue by exploring the experiences of couples that play World of Warcraft together. Learning outcomes were identified (involving the management of ludic, social and material resources) along with learning processes, which followed Wenger’s model of participation in Communities of Practice. Comparing this with existing literature suggests that productive comparisons can be drawn with the experiences of distance education students and the social pressures that affect their participation

Assessing Patterns of Disengagement and Re-entry in Two Local Congregations of Churches of Christ

This study investigates two congregations among Churches of Christ with a prototype instrument adapted from questions used in a national survey (The Unchurched American, The Princeton Religion Research Center, 1978). The ministry objective for this project thesis is to generate an assessment instrument to be used as a tool for ministry between active and inactive church members. Specific questions addressed are: what are the patterns of disengagement and re-entry in two local congregations connected with Churches of Christ? Is the disengagement of teenagers and young adults (age 13-24) in each local congregation measurably greater than other recognized age categories over the life cycle? Is the re-entry of young adults between the ages of 20 through 34 measurably greater than other recognized age categories over the family life cycle? In addition, what can be learned to assist ministry within the local congregation for families, parents, and teenagers in anticipation of adolescents emancipating during this transitional period of the family life cycle? What can be learned from these findings to assist ministry within the ii congregation in bridging to young families, couples, and singles who have earlier disengaged, but now might likely re-enter meaningful, active church membership? Since the operational variable in the two hypotheses for this study is age at the time of disengagement and reentry, the general research method used was a descriptive survey patterned after the model used by Gallup (1978). Essentially, the most pertinent questions and answers from the descriptive survey which Gallup developed were designed to generate quantitative data that measured the period of time between disengagement and re-entry of any person interviewed, if such had occurred. Predominantly in both congregations, there was a finding that disengagement occurs from the teenage years through the mid-twenties. In each of these congregations, the process of re-entry is occurring as inactive church members reach the mid-twenties and the mid-thirties. Evidence from these findings tends to support superseding the prevailing ministry model of linear causation. An interactive model provided by family systems theory can create ministry between both active and inactive church members

Analysis of a high-end memory supply chain : dram vendors to final assembly

Thesis (S.M.)--Massachusetts Institute of Technology, Sloan School of Management; and, (S.M.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering; in conjunction with the Leaders for Manufacturing Program, Massachusetts Institute of Technology, 2000.Also available online at the MIT Theses Online homepage .Includes bibliographical references (p. 89).Compaq Computer Corporation's High Performance Systems Division (HPSD) manufactures servers for mid-range and high-end server markets. It has a complex supply chain that includes the use of supplier hubs, outsourced memory module manufacturers, and stacked memory devices (chips). For this memory module supply chain, Compaq faces two major planning challenges. First, it is very difficult to get an accurate forecast of memory requirements. Second, the cost of memory continues to decline, on the order of 1-4% per month, which results in a high inventory holding cost. A set of standard software tools is developed to assist analysts with determining the supply plan for memory from multiple suppliers. The purpose of these tools is to determine the minimum cost supply plan with an acceptable level of forecast risk. Two separate tools individually address cost and forecast challenges. The Cost Tool can consider up to nine cost categories across the supply chain network upstream from the factory. The tool is flexible, transparent, easily disseminated and easy to use. The Forecast Tool can track current supply activity and can forecast the next week's and next quarter's supply plan. The tool consists of a main menu worksheet and another worksheet for each quarter of the year in Microsoft Excel. It can be used for any commodity. It is flexible, easy to use and easily disseminated. Use of these tools should lead to more expeditious analyses of supply plans and forecasts while yielding estimates of the supply chain costs for a particular supply plan. A conceptual model for decreasing costs by combining supply chain costs with a standard purchasing price-parity point is presented. The purpose of this model is to provide purchasers another point of view based on total supply chain costs, including inventory write-offs due to decreasing memory prices and transportation costs.by Mitchell Abbott Malone.S.M

IODP Expeditions 303 and 306 Monitor Miocene-Quaternary Climate in the North Atlantic

Introduction The IODP Expeditions 303 and 306 drilling sites were chosen for two reasons: (1) to capture Miocene-Quaternary millennial-scale climate variability in sensitive regions at the mouth of the Labrador Sea and in the North Atlantic icerafted debris (IRD) belt (Ruddiman et al., 1977), and (2) to provide the sedimentary and paleomagnetic attributes, including adequate sedimentation rates, for constructinghigh-resolution isotopic and magnetic stratigraphies.High accumulation rates, reaching 20 cm ky-1, permit the study of millennial-scale variations in climate and in the Earth's magnetic fi eld over the past several million years, when the amplitude and frequency of climate variability changed substantially. Shipboard logging and scanning data (magnetic susceptibility and remanence, density, natural gamma radiation, digital images and color refl ectance) and post-expedition x-ray fl uorescence (XRF) scanning datahave revealed that the sediment cores recovered on Expeditions 303 and 306 contain detailed histories of millennial-scale climate and geomagnetic fi eld variability throughout the late Miocene to Quaternary epochs. The climate proxies will be integrated with paleomagnetic data to place the records of millennial-scale climate change into a high resolution stratigraphy based on oxygen isotope andrelative paleomagnetic intensity (RPI). The paleomagnetic record of polarity reversals, excursions and RPI in these cores is central to the construction of the stratigraphic template and will provide detailed documentation of geomagnetic fi eld behavior

Volcanic Initiation of the Eocene Heart Mountain Slide, Wyoming, USA

The Eocene Heart Mountain slide of northwest Wyoming covers an area of as much as 5000 km2 and includes allochthonous Paleozoic carbonate and Eocene volcanic rocks with a run-out distance of as much as 85 km. Recent geochronologic data indicated that the emplacement of the slide event occurred at ∼48.9 Ma, using laser ablation inductively coupled plasma mass spectrometry (LA-ICPMS) extracted from U-Pb zircon ages from basal layer and injectite carbonate ultracataclasite (CUC). We now refine that age with U-Pb results from a lamprophyre diatreme that is temporally and spatially related to the CUC injectites. The ages for the lamprophyre zircons are 48.97 ± 0.36 Ma (LA-ICPMS) and 49.19 ±0.02 Ma (chemical abrasion isotope dilution thermal ionization mass spectrometry). Thus, the lamprophyre and CUC zircons are identical in age, and we interpret that the zircons in the CUC were derived from the lamprophyre during slide emplacement. Moreover, the intrusion of the lamprophyre diatreme provided the trigger mechanism for the Heart Mountain slide. Additional structural data are presented for a variety of calcite twinning strains, results from anisotropy of magnetic susceptibility for the lamprophyre and CUC injectites and alternating-field demagnetization on the lamprophyre, to help constrain slide dynamics. These data indicate that White Mountain experienced a rotation about a vertical axis and minimum of 35° of counterclockwise motion during emplacement

How to maintain the sustainable development of a business platform : a case study of Pinduoduo social commerce platform in China

At present, the ‘platform business model’ has indicated innovative potentials not just in traditional industrial sectors such as telecommunications, IT and retail, but also other sectors like social commerce. However, ‘Platform’ is not static as it is firmed at the beginning. Using Pinduoduo as a case study, this research conducts in-depth interviews and surveys in China to analyze the dynamic change of the platform provider’s role for successful platform operation via the lens of platform business models. As a “2.0 generation eCommerce platform”, Pinduoduo platform has become the largest social commerce platform in China with continuous growth at a high speed. The study found that stabilisation of the platform has experienced two stages: spread and evolution. At the spread stage, the role of platform provider focuses on forming “incentive to participants” through “Low price + Social contact” strategy and “Gamification + brand channel” strategy. At the evolution stage, the provider’s role is transformed into manager of products/services quality and revenue structure. Pinduoduo’s quality control is composed of three levels, including front-end quality control, middle-end quality control and back-end quality control. Besides, platform revenue structure strategies are sponsor-type. The purpose of this study is to enlighten the current players in the market on how they might utilize the underlying rationales in framework to further develop their platform business models. From the perspective of a platform, sustainable development of a theoretical framework is proposed based on these findings to facilitate future research in this area

More-than-human politics in the new arctic landscape of youth : Atmospheric shifts at the shopping mall

Peer reviewe

A Minimal Threshold of c-di-GMP Is Essential for Fruiting Body Formation and Sporulation in Myxococcus xanthus

Generally, the second messenger bis-(3’-5’)-cyclic dimeric GMP (c-di-GMP) regulates the switch between motile and sessile lifestyles in bacteria. Here, we show that c-di-GMP is an essential regulator of multicellular development in the social bacterium Myxococcus xanthus. In response to starvation, M. xanthus initiates a developmental program that culminates in formation of spore-filled fruiting bodies. We show that c-di-GMP accumulates at elevated levels during development and that this increase is essential for completion of development whereas excess c-di-GMP does not interfere with development. MXAN3735 (renamed DmxB) is identified as a diguanylate cyclase that only functions during development and is responsible for this increased c-di-GMP accumulation. DmxB synthesis is induced in response to starvation, thereby restricting DmxB activity to development. DmxB is essential for development and functions downstream of the Dif chemosensory system to stimulate exopolysaccharide accumulation by inducing transcription of a subset of the genes encoding proteins involved in exopolysaccharide synthesis. The developmental defects in the dmxB mutant are non-cell autonomous and rescued by co-development with a strain proficient in exopolysaccharide synthesis, suggesting reduced exopolysaccharide accumulation as the causative defect in this mutant. The NtrC-like transcriptional regulator EpsI/Nla24, which is required for exopolysaccharide accumulation, is identified as a c-diGMP receptor, and thus a putative target for DmxB generated c-di-GMP. Because DmxB can be—at least partially—functionally replaced by a heterologous diguanylate cyclase, these results altogether suggest a model in which a minimum threshold level of c-di-GMP is essential for the successful completion of multicellular development in M. xanthus

1953: Abilene Christian College Bible Lectures - Full Text

Delivered in the Auditorium of Abilene Christian College, February, 1953 ABILENE, TEXAS PRICE: $3.00 firm foundation publishing house Box 77 Austin 01, Texa