Software Testbed for Selective Laser Sintering

Computer software plays an important role in the implementation of Solid Freeform Fabrication (SFF) technologies. This paper describes a software testbed for processing part geometry for a particular SFF technology, selective laser sintering (SLS), that is built around the separation of the slicing and rasterization operations to accommodate geometric information from a variety of sources. The paper also discusses the process control software being developed for a new high-temperat rkstation for SLS of metal powders. This program features a high-resolution data rmat, the ability to interpolate to achieve a desired resolution, and a menu-driven user interface with graphical feedback and process simulation capabilities.Mechanical Engineerin

The effects of climate change and variation in New Zealand: An assessment using the CLIMPACTS system

Along with a need to better understand the climate and biophysical systems of New Zealand, the need to develop an improved capacity for evaluating possible changes in climate and their effects on the New Zealand environment has been recognised. Since the middle of 1993 the CLIMPACTS programme, has been focused on the development of such a capacity, in the first instance for the agricultural sector. the goals of this present assessment are: 1. To present current knowledge on likely scenarios of climate change and associated uncertainties in New Zealand; 2. To present current knowledge, based on quantitative analyses using a consistent set of scenarios, on the likely effects of climate change on a range of agricultural and horticultural crops of economic importance; 3. To demonstrate, by way of this report and the associated technical report, the capacity that has been developed for ongoing assessments of this kind in New Zealand. This report has been prepared for both the science and policy communities in New Zealand. There are two main components: 1. The detailed findings of the assessment, presented in a series of chapters; 2. An annex, which contains technical details on models used in the assessment

Factors Affecting the Cleanliness of Cattle Housed in Buildings wiith Concrete Slatted Floors.

End of Project ReportFrom a series of experiments at Grange Research Centre, cattle were cleanest at housing in the autumn, however, within 3 to 4 weeks of housing on concrete slats and fed with a diet of grass silage, cattle were dirtiest, with the majority of the cattle in category 4 or 5. Cattle tended to be cleaner in the late March, early April period as they shed their winter hair coat. Cattle fed concentrates plus straw were significantly cleaner at slaughter compared to similar cattle offered grass silage plus concentrates. Cattle housed indoor on slats during the summer were cleaner than cattle on similar diet and accommodation during the winter. High dry matter silage produced cleaner cattle than did low dry matter silages. Back and tail clipping of cattle at the commencement of the winter finishing period did not have any positive effect on cleanliness score or liveweight gain when the cattle were accommodated in well ventilated slatted floor houses. A survey of 19 farms specialising in finishing cattle failed to show any correlation between stocking density, solid floor area or level of concentrate feeding on the cleanliness of finishing cattle. A survey of 36 finishing units, designated as producers of "clean" or "dirty" cattle at slaughter, found that units with clean cattle had houses which were in general well ventilated, had A-type roofs with an open ridge outlet and in general the grass silage offered was a higher dry matter. In contrast, finishing units with dirty cattle tended to be poorly ventilated and the grass silage offered had a lower dry matter. Overall in the survey cattle cleanliness score was not affected by stocking density (2.0m 2 3.8m 2) or the proportion of solid floor area in the pen. Cattle accommodated on gang slats were dirtier than those accommodated on single slats

Beyond Plea Bargaining: A Theory of Criminal Settlement

Settlement is a term rarely used in criminal law. Instead, people speak almost exclusively of plea bargaining—i.e., enforceable agreements in which a defendant promises to plead guilty in exchange for a prosecutor’s promise to seek leniency in charging or at sentencing. But a traditional plea agreement is just the most visible instance of a much broader class of possible criminal settlement agreements. In terms of their fundamentals, criminal settlements are indistinguishable from their civil counterparts: through either an atomized or comprehensive bargain, parties exchange what they have for what they want, advancing their respective interests in cost minimization, risk mitigation, and value maximization. Focusing only on a defendant’s promise to plead guilty discounts the diversity and complexity of the agreements into which defendants and prosecutors may and regularly do enter. This Article advances a comprehensive framework of criminal settlement—one that leverages incomplete or partial settlements as an analytical frame that stretches beyond mere plea bargaining. As in the civil context, criminal settlements need not resolve disputes outright but may instead limit or redefine a dispute in a way that the parties find mutually beneficial. A crucial difference in the criminal context, however, is that these bargains necessarily take place in the shadow of judicial discretion that regulates access to the state’s power to punish. Consequently, prosecutors and defendants may agree to reshape procedures, issues, and potential outcomes in order to constrain or influence judicial decision-making in ways that are congruent with their respective interests. But judges are not passive in this landscape. They, too, may act strategically to prompt the bargains we ultimately observe. By modeling this interplay between parties and judges, this Article fashions a more complete picture of the motivations, consequences, and policy implications of criminal settlement

A chronology of alluvial fan response to Late Quaternary sea level and climate change, Crete

To better understand how fluvial systems respond to late Quaternary climatic forcing OSL and U-series dating was applied to stratigraphically significant sedimentary units within a small (<6.5 km) alluvial fan system (the Sphakia fan) in southwest Crete. The resultant chronology (comprising 32 OSL and U-series ages) makes Sphakia fan one of the best dated systems in the Mediterranean and suggests that Cretan fans responded to climate in two ways. First, during the transitions between Marine Isotope Stage (MIS) 5a/4 and MIS 2/1 Sphakia fan was characterised by significant entrenchment and distal shift in the zone of deposition. It is proposed that the phases of entrenchment were driven by sea level induced base level fall during MIS 5a/4 and landscape stabilisation during the onset of the current interglacial (MIS 2/1). Second, with the exception of these two entrenchment episodes fan alluviation occurred across the entire last interglacial/glacial cycle in all climatic settings i.e. interglacials, interstadials and stadials. It is likely that the topographic setting of the catchment supplying sediment to Sphakia fan maintained high sediment transfer rates during most climatic settings enabling fan aggradation to occur except during major climatic driven transitions i.e. major sea level fall and postglacial vegetation development.N/

Seven-in-Ten Americans Now See Russia as an Enemy

Russia's invasion of Ukraine has led to a dramatic shift in American public opinion: 70% of Americans now consider Russia an enemy of the United States, up from 41% in January. And on this topic, Democrats and Republicans largely agree, with 72% of Democrats and 69% of Republicans describing Russia as an enemy.A new Pew Research Center survey, conducted March 21-27, finds that just 7% of U.S. adults have an overall favorable opinion of Russia. Only 6% express confidence in its leader, President Vladimir Putin. In contrast, 72% have confidence in Ukrainian President Volodymyr Zelenskyy

Effects of negative energy balance on liver gene and protein expression during the early postpartum period and its impacts on dairy cow fertility

End of project reportNegative energy balance (NEB) is a severe metabolic affecting high yielding dairy cows early post partum with both concurrent and latent negative effects on cow fertility as well as on milk production and cow health. The seasonal nature of Irish dairy production necessitates high cow fertility and a compact spring calving pattern in order to maximise grass utilisation. Poor dairy cow reproductive performance currently costs the Irish cattle industry in excess of €400 million annually. High milk yields have been associated with lower reproductive efficiency, and it has been suggested that this effect is probably mediated through its effects on the energy balance of the cow during lactation. The modern high genetic merit dairy cow prioritises nutrient supply towards milk production in early lactation and this demand takes precedence over the provision of optimal conditions for reproduction. In this study we used the bovine Affymetrix 23,000 gene microarray, which contains the most comprehensive set of bovine genes to be assembled and provides a means of investigating the modifying influences of energy balance on liver gene expression. Cows in severe negative energy balance (SNEB) in early lactation showed altered hepatic gene expression in metabolic processes as well as a down regulation of the insulin-like growth factor (IGF) system, where insulin like growth factor-1 (IGF-1), growth hormone receptor variant 1A (GHR1A) and insulin-like growth factor binding protein-acid labile subunit (IGFBP-ALS) were down regulated compared to the cows in the moderate negative energy balance MNEB group, consistent with a five-fold reduction in systemic concentrations of IGF1 in the SNEB group.Cows in SNEB showed elevated expression of key genes involved in the inflammatory response such as interleukin-8 (IL-8). There was a down regulation of genes involved in cellular growth in SNEB cows and moreover a negative regulator of cellular proliferation (HGFIN) was up regulated in SNEB cows, which is likely to compromise adaptation and recovery from NEB. The puma method of analysis revealed that 417 genes were differentially regulated by EB (P<0.05), of these genes 190 were up-regulated while 227 were down-regulated, with 405 genes having known biological functions. From Ingenuity Pathway Analysis (IPA), lipid catabolism was found to be the process most affected by differences in EB status

What People Around the World Like And Dislike About American Society and Politics

As Pew Research Center surveys have documented, the United States' global reputation has shifted dramatically over the past two decades, often improving or declining depending on who is in the White House and the foreign policies they pursue. At the same time, many other factors have continued to shape how people see the U.S., including its vast cultural reach, its economic model and its divisive politics. A survey of 17 advanced economies highlights the complexity of America's international image. People in other publics find much to admire about the U.S., but they see many problems as well. Americans, for their part, also see both strengths and weaknesses in their society

An integrated sequence stratigraphic, palaeoenvironmental, and chronostratigraphic analysis of the Tangahoe Formation, southern Taranaki coast, with implications for mid-Pliocene (c. 3.4–3.0 Ma) glacio-eustatic sea-level changes

Sediments of the mid-Pliocene (c. 3.4–3.0 Ma) Tangahoe Formation exposed in cliffs along the South Taranaki coastline of New Zealand comprise a 270 m thick, cyclothemic shallow-marine succession that has been gently warped into a north to south trending, low angle anticline. This study examines the sedimentologic, faunal, and petrographic characteristics of 10 Milankovitch-scale (6th order), shallow-marine depositional sequences exposed on the western limb of the anticline. The sequences are recognised on the basis of the cyclic vertical stacking of their constituent lithofacies, which are bound by sharp wave cut surfaces produced during transgressive shoreface erosion. Each sequence comprises three parts: (1) a 0.2–2 m thick, deepening upwards, basal suite of reworked bioclastic lag deposits (onlap shellbed) and/or an overlying matrix supported, molluscan shellbed of offshore shelf affinity (backlap shellbed); (2) a 5–20 m thick, gradually shoaling, aggradational siltstone succession; and (3) a 5–10 m thick, strongly progradational, well sorted “forced regressive” shoreline sandstone. The three-fold subdivision corresponds to transgressive, highstand, and regressive systems tracts (TSTs, HSTs, and RSTs) respectively, and represents deposition during a glacio-eustatic sea-level cycle. Lowstand systems tract sediments are not recorded because the outcrop is situated c. 100 km east of the contemporary shelf edge and was subaerially exposed at that time. Well developed, sharp- and gradational-based forced regressive sandstones contain a variety of storm-emplaced sedimentary structures, and represent the rapid and abrupt basinward translation of the shoreline on to a storm dominated, shallow shelf during eustatic sea-level fall. Increased supply of sediment from north-west South Island during “forced regression” is indicated from petrographic analyses of the heavy mineralogy of the sandstones. A chronology based on biostratigraphy and the correlation of a new magnetostratigraphy to the magnetic polarity timescale allows: (1) identification of the Mammoth (C2An.2r) and Kaena (C2An.1r) subchrons; (2) correlation of the coastal section to the Waipipian Stage; and (3) estimation of the age of the coastal section as 3.36–3.06 Ma. Qualitative assessment of foraminiferal census data and molluscan palaeoecology reveals cyclic changes in water depth from shelf to shoreline environments during the deposition of each sequence. Seven major cycles in water depth of between 20 and 50m have been correlated to individual 40 ka glacio-eustatic sea-level cycles on the marine oxygen isotope timescale. The coastal Tangahoe Formation provides a shallow-marine record of global glacio-eustasy prior to the development of significant ice sheets on Northern Hemisphere continents, and supports evidence from marine δ18O archives that changes in Antarctic ice volume were occurring during the Pliocene

Finite-element modelling of mechanical behaviour of rapid manufactured textiles

Novel textile-like linked structures, realised using a rapid manufacturing (RM) process, have been proposed and developed recently. Various potential applications exist, and in most cases the mechanical performance must be evaluated. The present paper outlines a method to solve this problem by employing finite-element (FE) techniques at two scales, using the results of analysis at the meso-scale (the scale of the repeating unit) to provide equivalent non-linear spring behaviour for each textile link at the macro-scale. Validation with experimental test data from each scale was performed and these results are presented. Initial results overestimated mechanical performance. Microscopy suggested that this may be due to edge porosity in the specimens, and the dimensions of the FE models were adjusted accordingly as an initial approach to account for this. Predictions incorporating this modification exhibited excellent agreement with experimental measurements. The current work demonstrates both a technique, which could be automated for use in the design environment, and the potential value of developing an integrated process simulation to provide local material property data for the FE model