Analysis and design of a flat central finned-tube radiator

Computer program based on fixed conductance parameter yields minimum weight design. Second program employs variable conductance parameter and variable ratio of fin length to tube outside radius, and is used for radiator designs with geometric limitations. Major outputs of the two programs are given

Efeito da planta matriz, estação do ano e ambiente de cultivo na miniestaquia de Pinus radiata.

A estaquia de genótipos superiores de Pinus radiata é uma prática comum na silvicultura. Para sua utilização no Brasil, protocolos de propagação precisam ser estabelecidos. Este trabalho avaliou a miniestaquia aplicada à produção de mudas da espécie, estudando a posição de coleta de broto na planta matriz, a estação do ano e o minijardim. Plantas matrizes seminais, com 1 m de altura e 1,5 anos de idade, foram utilizadas para a produção de miniestacas. Três ensaios consecutivos foram feitos: (i) o enraizamento das miniestacas coletadas de três posições nas matrizes (topo, intermediário e basal), (ii) a influência do minijardim (vaso, canaletão e campo) no desenvolvimento de minicepas e (iii) o efeito da estação do ano (inverno, primavera e verão) sobre o desenvolvimento de miniestacas coletadas de minicepas no canaletão, no vaso e em campo. As miniestacas coletadas da região intermediária das matrizes, com 1,5 anos de idade, apresentaram maior enraizamento do que as coletadas no topo e na região basal. As melhores estações para o desenvolvimento dos brotos foram inverno e primavera, em ambientes de vaso e campo. O verão promoveu melhor desenvolvimento das miniestacas em casa de vegetação, a partir de matrizes cultivadas em canaletão

Paper Session III-B - Space Technology Graduate Program for Engineers and Scientists

A Master of Science in Space Technology is offered to engineering and science graduates at the Spaceport Graduate Center which is an off-campus teaching center of the Florida Institute of Technology. Courses are offered in the evening at Kennedy Space Center and Patrick Air Force Base so that space professionals can continue their education. The goals of the program are to prepare students for broader responsibility and more rewarding careers in astronautics and space, as well as to contribute to improvement in defining and implementing national and international space goals. It has been endorsed by NASA, the USAF, and large aerospace companies. This paper describes an education program which removes interdisciplinary barriers in accepting a spectrum of students with different engineering and scientific backgrounds. Topics addressed include course curricula, the composition of the students and faculty, program successes and challenges, as well as plans for the future. Emphasis is given to the progress that has been made since Dr. Angelo described the program to the 23rd Space Congress in 1986. Over 70 students have graduated with an MS hi Space Technology and are advancing in their careers. The faculty has been expanded to include a full-time program chairman and twenty adjunct professors, seven of these holding Ph D\u27s in physics or astronomy and eight holding Ph D\u27s in engineering disciplines. An important objective of this paper is to solicit inputs to make the program even more valuable. An Industry Advisory Council is being set-up for this purpose, consisting of the Chief Executive Officers of local aerospace companies and government. Future developments will include research activity in conjunction with the Space Research Institute and a Space Engineering supplement. It is fundamental that better understanding of the technical aspects of all phases of space activity will foster improved coordination among, and better decisions by, the future leaders of Space and Astronautics

Análise de enraizamento de estacas de Pinus radiata para multiplicação clonal.

Resumo

The Zeeman effect in the G band

We investigate the possibility of measuring magnetic field strength in G-band bright points through the analysis of Zeeman polarization in molecular CH lines. To this end we solve the equations of polarized radiative transfer in the G band through a standard plane-parallel model of the solar atmosphere with an imposed magnetic field, and through a more realistic snapshot from a simulation of solar magneto-convection. This region of the spectrum is crowded with many atomic and molecular lines. Nevertheless, we find several instances of isolated groups of CH lines that are predicted to produce a measurable Stokes V signal in the presence of magnetic fields. In part this is possible because the effective Land\'{e} factors of lines in the stronger main branch of the CH A$^{2}\Delta$--X$^{2}\Pi$ transition tend to zero rather quickly for increasing total angular momentum $J$, resulting in a Stokes $V$ spectrum of the G band that is less crowded than the corresponding Stokes $I$ spectrum. We indicate that, by contrast, the effective Land\'{e} factors of the $R$ and $P$ satellite sub-branches of this transition tend to $\pm 1$ for increasing $J$. However, these lines are in general considerably weaker, and do not contribute significantly to the polarization signal. In one wavelength location near 430.4 nm the overlap of several magnetically sensitive and non-sensitive CH lines is predicted to result in a single-lobed Stokes $V$ profile, raising the possibility of high spatial-resolution narrow-band polarimetric imaging. In the magneto-convection snapshot we find circular polarization signals of the order of 1% prompting us to conclude that measuring magnetic field strength in small-scale elements through the Zeeman effect in CH lines is a realistic prospect.Comment: 22 pages, 6 figures. To be published in the Astrophysical Journa

2023 Judge Horace J. Johnson, Jr. Lecture on Race, Law and Policy with Vanita Gupta

School of Law Dean Peter Bo Rutledge gave introductory remarks, while law faculty members Clare Norins and John Meixner co-moderated, and SPIA Dean Matthew Auer provided closing remarks. Vanita Gupta is the 19thUnited States Associate Attorney General and serves as the third-ranking official at the Department of Justice. Associate Attorney General Gupta supervises multiple litigating divisions within the Department of Justice, including the Civil Division, Civil Rights Division, Antitrust Division, Tax Division, and Environmental and Natural Resources Division. She also oversees the grant making components of the Department, including the Office of Justice Programs, the Office on Violence Against Women, and the Office of Community Oriented Policing Services; and supervises the Office for Access to Justice, Office of Information Policy, the Community Relations Service, the Executive Office for United States Trustees, the Foreign Claims Settlement Commission, and the Service members and Veterans Initiative. Associate Attorney General Gupta previously served as the President and Chief Executive Officer of the Leadership Conference on Civil and Human Rights, the nation’s oldest and largest coalition of non-partisan civil rights organizations in the United States. Before serving in that capacity, from October 15, 2014, to January 20, 2017, Associate Attorney General Gupta served as Acting Assistant Attorney General and Head of the Department of Justice’s Civil Rights Division. Appointed by President Barack Obama as the chief civil rights prosecutor for the United States, Associate Attorney General Gupta advanced a wide range of civil rights enforcement matters. Prior to her tenure leading the Civil Rights Division, Associate Attorney General Gupta served as Deputy Legal Director and the Director of the Center for Justice at the American Civil Liberties Union (ACLU). In addition to managing litigation, Associate Attorney General Gupta created and led the ACLU’s Smart Justice Campaign aimed at promoting bipartisan justice reform while keeping communities safe. She began her legal career as an attorney at the NAACP Legal Defense & Educational Fund. Associate Attorney General Gupta graduated magna cum laude from Yale University and received her law degree from New York University School of Law, where later she taught a civil rights litigation clinic for several year

Direct Visualization of Single Nuclear Pore Complex Proteins Using Genetically-Encoded Probes for DNA-PAINT

The nuclear pore complex (NPC) is one of the largest and most complex protein assemblies in the cell and, among other functions, serves as the gatekeeper of nucleocytoplasmic transport. Unraveling its molecular architecture and functioning has been an active research topic for decades with recent cryogenic electron microscopy and super-resolution studies advancing our understanding of the architecture of the NPC complex. However, the specific and direct visualization of single copies of NPC proteins is thus far elusive. Herein, we combine genetically-encoded self-labeling enzymes such as SNAP-tag and HaloTag with DNA-PAINT microscopy. We resolve single copies of nucleoporins in the human Y-complex in three dimensions with a precision of circa 3 nm, enabling studies of multicomponent complexes on the level of single proteins in cells using optical fluorescence microscopy

Generic Mechanism of Emergence of Amyloid Protofilaments from Disordered Oligomeric aggregates

The presence of oligomeric aggregates, which is often observed during the process of amyloid formation, has recently attracted much attention since it has been associated with neurodegenerative conditions such as Alzheimer's and Parkinson's diseases. We provide a description of a sequence-indepedent mechanism by which polypeptide chains aggregate by forming metastable oligomeric intermediate states prior to converting into fibrillar structures. Our results illustrate how the formation of ordered arrays of hydrogen bonds drives the formation of beta-sheets within the disordered oligomeric aggregates that form early under the effect of hydrophobic forces. Initially individual beta-sheets form with random orientations, which subsequently tend to align into protofilaments as their lengths increases. Our results suggest that amyloid aggregation represents an example of the Ostwald step rule of first order phase transitions by showing that ordered cross-beta structures emerge preferentially from disordered compact dynamical intermediate assemblies.Comment: 14 pages, 4 figure