Advanced recovery systems wind tunnel test report

Pioneer Aerospace Corporation (PAC) conducted parafoil wind tunnel testing in the NASA-Ames 80 by 120 test sections of the National Full-Scale Aerodynamic Complex, Moffett Field, CA. The investigation was conducted to determine the aerodynamic characteristics of two scale ram air wings in support of air drop testing and full scale development of Advanced Recovery Systems for the Next Generation Space Transportation System. Two models were tested during this investigation. Both the primary test article, a 1/9 geometric scale model with wing area of 1200 square feet and secondary test article, a 1/36 geometric scale model with wing area of 300 square feet, had an aspect ratio of 3. The test results show that both models were statically stable about a model reference point at angles of attack from 2 to 10 degrees. The maximum lift-drag ratio varied between 2.9 and 2.4 for increasing wing loading

Reverse Biomimetic’ Synthesis of L-Arogenate and its Stabilized Analogues from L-Tyrosine

l-Arogenate (also known as l-pretyrosine) is a primary metabolite on a branch of the shikimate biosynthetic pathway to aromatic amino acids. It plays a key role in the synthesis of plant secondary metabolites including alkaloids and the phenylpropanoids that are the key to carbon fixation. Yet understanding the control of arogenate metabolism has been hampered by its extreme instability and the lack of a versatile synthetic route to arogenate and its analogues. We now report a practical synthesis of l-arogenate in seven steps from O-benzyl l-tyrosine methyl ester in an overall yield of 20%. The synthetic route also delivers the fungal metabolite spiroarogenate, as well as a range of stable saturated and substituted analogues of arogenate. The key step in the synthesis is a carboxylative dearomatization by intramolecular electrophilic capture of tyrosine's phenolic ring using an N-chloroformylimidazolidinone moiety, generating a versatile, functionalizable spirodienone intermediate

Are Pakistan's rice markets integrated domestically and with the international markets?

We analyze whether Pakistan has become one domestically integrated rice market and whether Pakistan’s rice markets are integrated with the international markets, using monthly data from 1994 to 2011. During this period, major policy shifts took place. In 2002, Pakistan terminated the price support policy; in 2002-2004 export subsidies were introduced, and in 2008, a minimum export price policy was adopted. We compare the degree of integration before and after 2002. We find that most of the regional rice markets in Pakistan are integrated domestically. Pakistan’s rice markets are also integrated with the international markets, using prices in Thailand and Vietnam as benchmarks. The price support policy abolition seems to have contributed to greater domestic integration, while the subsequent export policies seem to have decreased the extent of Pakistan’s integration with the international markets. However, although Pakistan’s rice markets generally are domestically integrated as well as integrated with the international market, price adjustments are quite slow. Thus, only 3% to 11% of deviations from long-run equilibrium are adjusted on a monthly basis, indicating that a shock in international markets takes several months to be fully transferred to prices in Pakistan