Low-speed aerodynamic characteristics of a 13-percent-thick airfoil section designed for general aviation applications

Wind-tunnel tests were conducted to determine the low-speed section characteristics of a 13 percent-thick airfoil designed for general aviation applications. The results were compared with NACA 12 percent-thick sections and with the 17 percent-thick NASA airfoil. The tests were conducted ovar a Mach number range from 0.10 to 0.35. Chord Reynolds numbers varied from about 2,000,000 to 9,000,000

The Detection of a 3.5-h Period in the Classical Nova Velorum 1999 (V382 Vel) and the Long Term Behavior of the Nova Light Curve

We present CCD photometry, light curve and time series analysis of the classical nova V382 Vel (N Vel 1999). The source was observed for 2 nights in 2000, 21 nights in 2001 and 7 nights in 2002 using clear filters. We report the detection of a distinct period in the light curve of the nova P=0.146126(18) d (3.5 h). The period is evident in all data sets, and we interpret it as the binary period of the system. We also measured an increase in the amplitude modulation of the optical light (in magnitude) by more than 55% from 2000 to 2001 and about 64% from 2001 to 2002. The pulse profiles in 2001 show deviations from a pure sinusoidal shape which progressively become more sinusoidal by 2002. The main cause of the variations in 2001 and 2002 can be explained with the occultation of the accretion disk by the secondary star. We interpret the observed deviations from a pure sinusoidal shape as additional flux resulting from the aspect variations of the irradiated face of the secondary star.Comment: 16 pages and 4 figures, accepted as it stands to be published in the Astronomical Journal (AJ

Ancient Egypt 1920 Part 1

Part 1 of the 1920 Ancient Egypt books. Contents include the return to research, Nile boats, the treasure of Antinoe, a mace head of Hierakonpolis, and an early portrait.https://knowledge.e.southern.edu/kweeks_coll/1010/thumbnail.jp

Ancient Egypt 1920 Part 2

Part 2 of the 1920 Ancient Egypt books. Contents include a Mentuhetep statue, varnishes in Theban tombs, the kings of Ethiopia, and Nile boats (continued).https://knowledge.e.southern.edu/kweeks_coll/1011/thumbnail.jp

Response to “Absence of Conclusive Evidence for the Safety and Efficacy of Gonadotropin‐Releasing Hormone Analogue Treatment in Protecting Against Chemotherapy‐Induced Gonadal Injury”

Peer Reviewedhttps://deepblue.lib.umich.edu/bitstream/2027.42/139979/1/onco0613.pd

A mosaic genetic screen for novel mutations affecting Drosophila neuroblast divisions

BACKGROUND: The asymmetric segregation of determinants during cell division is a fundamental mechanism for generating cell fate diversity during development. In Drosophila, neural precursors (neuroblasts) divide in a stem cell-like manner generating a larger apical neuroblast and a smaller basal ganglion mother cell. The cell fate determinant Prospero and its adapter protein Miranda are asymmetrically localized to the basal cortex of the dividing neuroblast and segregated into the GMC upon cytokinesis. Previous screens to identify components of the asymmetric division machinery have concentrated on embryonic phenotypes. However, such screens are reaching saturation and are limited in that the maternal contribution of many genes can mask the effects of zygotic loss of function, and other approaches will be necessary to identify further genes involved in neuroblast asymmetric division. RESULTS: We have performed a genetic screen in the third instar larval brain using the basal localization of Miranda as a marker for neuroblast asymmetry. In addition to the examination of pupal lethal mutations, we have employed the MARCM (Mosaic Analysis with a Repressible Cell Marker) system to generate postembryonic clones of mutations with an early lethal phase. We have screened a total of 2,300 mutagenized chromosomes and isolated alleles affecting cell fate, the localization of basal determinants or the orientation of the mitotic spindle. We have also identified a number of complementation groups exhibiting defects in cell cycle progression and cytokinesis, including both novel genes and new alleles of known components of these processes. CONCLUSION: We have identified four mutations which affect the process of neuroblast asymmetric division. One of these, mapping to the imaginal discs arrested locus, suggests a novel role for the anaphase promoting complex/cyclosome (APC/C) in the targeting of determinants to the basal cortex. The identification and analysis of the remaining mutations will further advance our understanding of the process of asymmetric cell division. We have also isolated a number of mutations affecting cell division which will complement the functional genomics approaches to this process being employed by other laboratories. Taken together, these results demonstrate the value of mosaic screens in the identification of genes involved in neuroblast division

The ``Outside-In'' Outburst of HT Cassiopeiae

We present results from photometric observations of the dwarf nova system HT Cas during the eruption of November 1995. The data include the first two--colour observations of an eclipse on the rise to outburst. They show that during the rise to outburst the disc deviates significantly from steady state models, but the inclusion of an inner-disc truncation radius of about 4 $R_{wd}$ and a ``flared'' disc of semi-opening angle of $10^{\circ}$ produces acceptable fits. The disc is found to have expanded at the start of the outburst to about $0.41R_{L1}$, as compared to quiescent measurements. The accretion disc then gradually decreases in radius reaching $<0.32R_{L1}$ during the last stages of the eruption. Quiescent eclipses were also observed prior to and after the eruption and a revised ephemeris is calculated.Comment: 9 pages, 11 figures, to appear in MNRA

Unilever Sustainable Tea. Part II: Reaching out to Smallholders in Kenya and Argentina

Commodity value chains around the world are increasingly stressed; some even face severe and dire circumstances. This is due to myriad social, environmental and economic challenges linked to the finite nature of natural resources and rapidly growing populations. These pressures threaten not only the raw material supply for key industries such as food & beverage and textiles, but also the livelihoods of tens of millions of people and the natural resources they depend on. For this reason, companies, NGOs, and governments are actively seeking solutions to render commodity value chains more sustainable. Tea – production, processing and consumption – is one of the commodity value chains in question. Part one of this case, the first of IDH’s Market Transformation case series, documents the strategic evolution of a groundbreaking initiative by Unilever, the Anglo-Dutch food & beverage company, to make its own tea value chain sustainable. This initiative started with the popular Lipton and PG Tips brands in specific countries and is gradually rolling out in other regions of the world. By reading part two of this case study, business executives and other stakeholders will learn from Unilever’s journey in multiple ways. The company, recognizing that no single entity can solve the complex issues around conversion of the tea value chain on its own, entered into a partnership with the Rainforest Alliance. Through Rainforest Alliance certification of tea plantations, the partnership has accelerated a transformation to sustainable Unilever tea products. Part two of the case study focuses on the very different experiences of Unilever “on the ground” in Kenya and Argentina. The lessons learned from building the partnerships in each country and the “win-win” outcomes for the players involved are carefully extracted and reported in each case. The Kenyan and Argentinian case stories are excellent examples of how companies, by carefully building multidimensional business cases for sustainability and strategic execution plans that account for the specific challenges of sustainability and partnerships, can grasp opportunities and forge new markets. It shows how companies can become first movers and leaders in contributing to more sustainable business models, stimulating multiple local environmental, social and economic pay o_ s while simultaneously ensuring the financial and longer-term sustainability of their core business