Through-flow solution for axial-flow turbomachine blade rows

Through flow solution for axial flow turbomachine blade row

Nomogram for the Evaluation of Blackbody Radiancy and of Peak and Total Intensities for Spectral Lines with Doppler Contour

A nomogram has been constructed for the determination of blackbody radiancy and of peak and total intensities for spectral lines with Doppler contour. The basic equations used for the construction of the nomogram and the use of the nomogram are described briefly. A method is outlined for determining absolute values of total intensities for spectral lines with combined Doppler and resonance contour by using the nomogram in conjunction with the “curves of growth.

Angular distributions of γ rays from the 7Li(p,γ) reaction at low energies

Angular distributions of the 14–17 MeV γ rays from the 7Li(p,γ) reaction at Ep=450, 402, and 80 keV were measured at 0°≤θlab≤135°, using a BGO detector and a 28-μg/cm2 LiF target. The angular distributions at Ep=450 and 402 keV agree with the previous results by Mainsbridge; at Ep=80 keV the ground-state transition is anisotropic on the order of 20%, confirming recent results by Chasteler et al

Aerodynamics of advanced axial-flow turbomachinery

A multi-task research program on aerodynamic problems in advanced axial-flow turbomachine configurations was carried out at Iowa State University. The elements of this program were intended to contribute directly to the improvement of compressor, fan, and turbine design methods. Experimental efforts in intra-passage flow pattern measurements, unsteady blade row interaction, and control of secondary flow are included, along with computational work on inviscid-viscous interaction blade passage flow techniques. This final report summarizes the results of this program and indicates directions which might be taken in following up these results in future work. In a separate task a study was made of existing turbomachinery research programs and facilities in universities located in the United States. Some potentially significant research topics are discussed which might be successfully attacked in the university atmosphere

Some electrical properties of lithium sialons

Sialons are a new range of high strength, refractory materials which can be prepared by hot-pressing mixtures of silicon nitride (Si(_3)N(_4)) and alumina (Al(_2)O(_3)) at temperatures of about 17000C. The resulting ceramics have a general formula Si(_6-z),Al(_z)0(_z)N(_8-z) where z may vary from 3 to 4. Their crystal structure is similar to that of Si(_3)N(_4) but N(^3-) is replaced by O(^2-) and, to effect charge compensation, Si(^4+) is replaced by Al(^3+). Charge compensation can also be achieved by introducing other metal ions such as Li(^+), Na(^+), Mg(^2+)and Y(^3+). This leads to an even greater possible range of ceramics. The present work is concerned with one group of these, the lithium sialons. The small amount of previous work on the electrical properties of lithium sialons was confined to preliminary measurements of d.c. conductivity. Here the electrical behaviour of a range of lithium sialons has been studied and then compared with that of pure sialons and an yttrium sialon glass in order to determine the conductivity, mechanism operating ivithin the lithium sialon samples. The orders of magnitude of conductivity encountered lay.between 10(_7)(ohm, cm)(^-1) and 10(^-3)(ohm cm)(^-1). Techniques have been developed for the measurement of d.c. conductivity (σ(_dc)) from room temperature to 800 C and of a.c. conductivity (σ(_ac)) from 20 Hz to 25 kHz over the same temperature range. The measurements also enabled dielectric constant and losses to be determined at the some temperatures and frequencies. The results showed the presence of two conductivity regimes, one above and one below about 400 . It has also been observed that (σ(_dc)) decreases as a result of passing current through the specimen and a preliminary examination of this apparent solid state electrolysis has been made. All the results are discussed in comparison with the available data on pure sialons and some other nitrogen ceramics

Rapid and accurate energy models through calibration with IPMI and RAPL

Energy consumption in Cloud and High Performance Computing platforms is a significant issue and affects aspects such as the cost of energy and the cooling of the data center. Host level monitoring and prediction provides the groundwork for improving energy efficiency through the placement of workloads. Monitoring must be fast and efficient without unnecessary overhead, to enable scalability. This precludes the use of Watt meters attached per host, requiring alternative approaches such as integrated measurements and models. IPMI and RAPL are subject to error and partial measurement, which may be mitigated. Models allow for prediction and more responsive measures of power consumption, but require calibrating. The causes of calibration error are discussed, along with mitigation strategies, without overly complicating the underlying model. An outcome is a Watt meter emulator that provides hosts level power measurement along with estimated power consumption for a given workload, with an average error of 0.20W

Application of blade-element techniques to design and performance prediction problems for axial-flow turbomachinery Progress report, 1 Apr. - 30 Sep. 1969

Noncavitating operation data from different axial flow pump rotor configurations and correlation of flow pump deviation angle

Functional interaction between the ZO-1-interacting transcription factor ZONAB/DbpA and the RNA processing factor symplekin

Epithelial tight junctions participate in the regulation of gene expression by controlling the activity of transcription factors that can interact with junctional components. One such protein is the Y-box transcription factor ZONAB/DbpA that binds to ZO-1, a component of the junctional plaque. Symplekin, another nuclear protein that can associate with tight junctions, functions in the regulation of polyadenylation and thereby promotes gene expression. Here, we addressed the question of whether these two proteins interact and whether this is of functional relevance. We demonstrate that ZONAB/DbpA and symplekin form a complex in kidney and intestinal epithelial cells that can be immunoprecipitated and that exists in the nucleus. The interaction between ZONAB/DbpA and symplekin can be reconstituted with recombinant proteins. In reporter gene assays in which ZONAB/DbpA functions as a repressor, symplekin functionally interacts with ZONAB/DbpA, indicating that symplekin can also promote transcriptional repression. RNAi experiments indicate that symplekin depletion reduces the nuclear accumulation and the transcriptional activity of ZONAB/DbpA in colon adenocarcinoma cells, resulting in inhibition of proliferation and reduced expression of the ZONAB/DbpA-target gene cyclin D1. Our data thus indicate that symplekin and ZONAB/DbpA cooperate in the regulation of transcription, and that they promote epithelial proliferation and cyclin D1 expression

Universal Design for Learning (UDL) in the Academic Library: A Methodology for Mapping Multiple Means of Representation in Library Tutorials

Librarians designed a biology tutorial not only to address an assignment, but also to make tutorials more accessible to students with various learning styles. The Science Librarian created the content by using aspects of the Information Literacy Standards for Science and Technology/Engineering, an informal survey of biology faculty, and assignments for the biology labs. The Instructional Design Librarian created multiple modules that engaged users through text, images, audio, and interactive tutorials. The researchers used Universal Design for Learning principles to address multiple learning styles, specifically multiple means of representation and created a mapping technique for those principles that can be applied to any library tutorial. To assess the effectiveness, students with learning disabilities completed a usability test on the tutorial