Axial-flow pump design digital computer program

FORTRAN program for computerized design of axial flow pump by blade element analysi

Through-flow solution for axial-flow turbomachine blade rows

Through flow solution for axial flow turbomachine blade row

Breeding terns on Al Jarrim islands

Fasht Al Jarrim is a sandy shoal situated approximately 20 km north (QA29) of the main island of Bahrain. Three small islands occur on the fasht. The northernmost of these is a natural island which belongs to the ruler of Bahrain and has been occupied by two caretakers until 2009. An access channel is maintained through the fasht from the deeper water to the south-west. Two further islands are found to the south-east of the channel in shallow water. These are manmade, created from the spoils of industrial exploration over 20 years ago. While the islands have no official names, they are referred to in this note as Al Jarrim south, middle and north for ease of identification

XMM-Newton observation of the interacting galaxies NGC1512 and NGC1510

The galaxy NGC1512 is interacting with the smaller galaxy NGC1510 and shows a peculiar morphology, characterised by two extended arms immersed in an HI disc whose size is about four times larger than the optical diameter of NGC1512. For the first time we performed a deep X-ray observation of the galaxies NGC1512 and NGC1510 with XMM-Newton to gain information on the population of X-ray sources and diffuse emission in a system of interacting galaxies. We identified and classified the sources detected in the XMM-Newton field of view by means of spectral analysis, hardness-ratios calculated with a Bayesian method, X-ray variability, and cross-correlations with catalogues in optical, infrared, and radio wavelengths. We also made use of archival Swift (X-ray) and Australia Telescope Compact Array (radio) data to better constrain the nature of the sources detected with XMM-Newton. We detected 106 sources in the energy range of 0.2-12 keV, out of which 15 are located within the D_25 regions of NGC1512 and NGC1510 and at least six sources coincide with the extended arms. We identified and classified six background objects and six foreground stars. We discussed the nature of a source within the D_25 ellipse of NGC1512, whose properties indicate a quasi-stellar object or an intermediate ultra-luminous X-ray source. Taking into account the contribution of low-mass X-ray binaries and active galactic nuclei, the number of high-mass X-ray binaries detected within the D_25 region of NGC1512 is consistent with the star formation rate obtained in previous works based on radio, infrared optical, and UV wavelengths. We detected diffuse X-ray emission from the interior region of NGC1512 with a plasma temperature of kT=0.68(0.31-0.87) keV and a 0.3-10 keV X-ray luminosity of 1.3E38 erg/s, after correcting for unresolved discrete sources.Comment: Accepted for publication in Astronomy and Astrophysics. 20 pages. Appendix B will be published electronically onl

The reintroduction of the grey partridge (perdix perdix) to Irish farmland: towards a methodology

KAVANAGH, B.: THE REINTRODUCTION OF THE GREY PARTRIDGE (PERDIX PERDIX) TO IRISH FARMLAND: TOWARDS A METHODOLOGY. Restocking of grey partridge, using game farm reared birds, never been successful in establishing a wild breeding population. Little information is available on the precise reasons for this failure. While the importation or translocation of wild caught birds to new areas has had limited success, this option has not been possible in Ireland in recent time. The aim of this project is to investigate and develop a methodology for the reintroduction of partridges using game farm stocks in a captive breeding programme based on a combination of the ‘Montabello’ and ‘Euston’ systems, used in the 19th century. The project is based on the hypothesis that partridges reared by parents will be better adapted to breed in the wild than birds reared from incubators. The study area is 1,000 hectares of mixed farmland in County Kildare. Two 7×3 m permanent pens were erected on each of three sites in the centre of the study area in autumn 1996. The sites were separated by 1 km from each other. An additional portable pen 5×2,5 m was erected at each site in spring 1998 bringing the total number of breeding pens to nine. In autumn 1996 twenty-five game farm reared partridges were released from each site. Forty birds survived to covey break up in February 1997. Three cocks and two hens were retrapped in spring using unreleased birds in the pens to attract mates. Thus five of the six pairs formed were composed of a retrapped and a previously unreleased bird while the sixth pen was filled an unreleased pair. All six penned pairs mated, all hens set nets and incubated. Hatching success was poor. Four chicks survived from two pens. Ten pairs of partridge were recorded in the study area from the previous autumn release. No chicks survived from these ten pairs outside the pens. Excessively wet weather during late incubation and hatching was responsible for most losses in the pens. In autumn 1997 seventy five game farm birds were released once again bringing the total autumn population to 100 birds in 1997. Thirty seven birds survived to spring 1998. Two cocks and two hens were retrapped and paired with unreleased mates. Four additional pairs from unreleased birds were placed in pens. Eggs were removed for incubation and replaced with dummy eggs. Twenty incubated eggs were then returned to the sitting hen at the piping stage. The outcome of this programme is reported

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

Peer tutoring for vocabulary for students with disabilities

This study examined the effects of peer tutoring on the vocabulary acquisition of students with disabilities in a middle school setting. This study included twelve 8th grade students in co-taught classes. The participants included two Hispanic students, six Caucasian students, and 4 African American students. All participating students are 13 or 14 years of age. The 12 students in this study are classified as learning disabled, multiply disabled, or autistic. Participating students worked in pairs for twelve weeks. The participants are from three separate classes, each class containing four participating students. Each class also included non-disabled students, who received instruction regularly with no changes to their daily activities. Following peer tutoring implementation, 9 of the 12 students increased their accuracy on grade-level vocabulary quizzes. For the remaining 3 students, one student\u27s score stayed the same, and the other 2 only saw small decreases while maintaining a passing grade. Results of this study show the effectiveness of peer tutoring strategies for vocabulary acquisition

Methods for the Study of Calcium Oxalate Crystallisation and Their Application to Urolithiasis Research

Many methods have been used to study calcium oxalate crystallisation. Most can be characterised by changes in supersaturation during the experiment, which may increase, remain constant or decay. Their ability to quantify various aspects of crystallisation often reflects the extent to which nucleation, growth and aggregation can be measured independently, when two or three of these processes may be occurring simultaneously. The mixed suspension, mixed product removal technique reaches a steady state supersaturation, is a good model for intrarenal crystallisation and allows both growth and nucleation rates to be measured. Using 92% urine and comparing control urines with samples from recurrent stone formers no difference in growth rates was found but the controls had higher nucleation rates (p=0.003) and lower supersaturations (p=0.001). In parallel crystallisers running simultaneously, heparin or hyaluronic acid addition to 92% urine was studied. Both macromolecules increased growth rates, decreased nucleation rates and increased supersaturation (p\u3c0.05). The steady state supersaturation achieved in this system may be an important determinant of stone forming potential. The ability to reach a lower urinary supersaturation by increased nucleation may be a crucial protective factor distinguishing non stone formers from stone formers

Fully automated segmentation and tracking of the intima media thickness in ultrasound video sequences of the common carotid artery

Abstract—The robust identification and measurement of the intima media thickness (IMT) has a high clinical relevance because it represents one of the most precise predictors used in the assessment of potential future cardiovascular events. To facilitate the analysis of arterial wall thickening in serial clinical investigations, in this paper we have developed a novel fully automatic algorithm for the segmentation, measurement, and tracking of the intima media complex (IMC) in B-mode ultrasound video sequences. The proposed algorithm entails a two-stage image analysis process that initially addresses the segmentation of the IMC in the first frame of the ultrasound video sequence using a model-based approach; in the second step, a novel customized tracking procedure is applied to robustly detect the IMC in the subsequent frames. For the video tracking procedure, we introduce a spatially coherent algorithm called adaptive normalized correlation that prevents the tracking process from converging to wrong arterial interfaces. This represents the main contribution of this paper and was developed to deal with inconsistencies in the appearance of the IMC over the cardiac cycle. The quantitative evaluation has been carried out on 40 ultrasound video sequences of the common carotid artery (CCA) by comparing the results returned by the developed algorithm with respect to ground truth data that has been manually annotated by clinical experts. The measured IMTmean ± standard deviation recorded by the proposed algorithm is 0.60 mm ± 0.10, with a mean coefficient of variation (CV) of 2.05%, whereas the corresponding result obtained for the manually annotated ground truth data is 0.60 mm ± 0.11 with a mean CV equal to 5.60%. The numerical results reported in this paper indicate that the proposed algorithm is able to correctly segment and track the IMC in ultrasound CCA video sequences, and we were encouraged by the stability of our technique when applied to data captured under different imaging conditions. Future clinical studies will focus on the evaluation of patients that are affected by advanced cardiovascular conditions such as focal thickening and arterial plaques

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