The Applicability of Taylor’s Model to the Drilling of CFRP Using Uncoated WC-Co Tools: The Influence of Cutting Speed on Tool Wear

This work investigates the applicability of Taylor’s model on the drilling of CFRP using uncoated WC-Co tools, by assessing the influence of cutting speed (Vc) on tool wear. Two different resins, possessing low and high glass transition temperatures (Tg), and two different reinforcements, high strength and high modulus woven fabrics, were combined into three different systems. Flank wear rate gradient exhibited to be more reinforcement dependent, while the actual flank wear rate showed to be sensible also to the type of resin. In terms of tool life, all CFRP systems adjusted into a power-type tool life vs. cutting speed curve through the full range of cutting speeds (1,000 RPM to 18,000 RPM). Therefore, Taylor’s model can be applied to estimate the tool life in the drilling of CFRP using uncoated WC-Co tools with good accuracy

Nanodiamonds with silicon vacancy defects for nontoxic photostable fluorescent labeling of neural precursor cells

Nanodiamonds (NDs) containing silicon vacancy (SiV) defects were evaluated as a potential biomarker for the labeling and fluorescent imaging of neural precursor cells (NPCs). SiV-containing NDs were synthesized using chemical vapor deposition and silicon ion implantation. Spectrally, SiV-containing NDs exhibited extremely stable fluorescence and narrow bandwidth emission with an excellent signal to noise ratio exceeding that of NDs containing nitrogen-vacancy centers. NPCs labeled with NDs exhibited normal cell viability and proliferative properties consistent with biocompatibility. We conclude that SiV-containing NDs are a promising biomedical research tool for cellular labeling and optical imaging in stem cell research

Reviews

The following publications have been reviewed by the mentioned authors;An Italic Calligraphy Handbook by Carolyn Knudsen Adams, reviewed by John LancasterDesign and British Industry by Richard Stewart, reviewed by John H. CarswellDesign Graphics by David Fair and Marilyn Kenny, reviewed by D. R. JonesGCSE Craft, Design and Technology by Richard Kimbell, John Plater and Tristram Shepard, reviewed by D. R. JonesProblem Solving in Science and Technology by David Rowlands, reviewed by Peter C. MillrayTechnical Drawing, An Usborne Guide by Susan Peach, reviewed by Keith VickersTVEI and Secondary Education: a critical appraisal by Denis Gleeson, reviewed by Martin MersonWorking in Design by the Careers and Occupational Information Centre, reviewed by S. J. Lodg

High-efficiency pharmacogenetic ablation of oligodendrocyte progenitor cells in the adult mouse CNS

Approaches to investigate adult oligodendrocyte progenitor cells (OPCs) by targeted cell ablation in the rodent CNS have limitations in the extent and duration of OPC depletion. We have developed a pharmacogenetic approach for conditional OPC ablation, eliminating >98% of OPCs throughout the brain. By combining recombinase-based transgenic and viral strategies for targeting OPCs and ventricular-subventricular zone (V-SVZ)-derived neural precursor cells (NPCs), we found that new PDGFRA-expressing cells born in the V-SVZ repopulated the OPC-deficient brain starting 12 days after OPC ablation. Our data reveal that OPC depletion induces V-SVZ-derived NPCs to generate vast numbers of PDGFRA+NG2+ cells with the capacity to proliferate and migrate extensively throughout the dorsal anterior forebrain. Further application of this approach to ablate OPCs will advance knowledge of the function of both OPCs and oligodendrogenic NPCs in health and disease

Degradation analysis in the estimation of photometric redshifts from non-representative training sets

We perform an analysis of photometric redshifts estimated by using a non-representative training sets in magnitude space. We use the ANNz2 and GPz algorithms to estimate the photometric redshift both in simulations as well as in real data from the Sloan Digital Sky Survey (DR12). We show that for the representative case, the results obtained by using both algorithms have the same quality, either using magnitudes or colours as input. In order to reduce the errors when estimating the redshifts with a non-representative training set, we perform the training in colour space. We estimate the quality of our results by using a mock catalogue which is split samples cuts in the $r$-band between $19.4< r< 20.8$. We obtain slightly better results with GPz on single point z-phot estimates in the complete training set case, however the photometric redshifts estimated with ANNz2 algorithm allows us to obtain mildly better results in deeper $r$-band cuts when estimating the full redshift distribution of the sample in the incomplete training set case. By using a cumulative distribution function and a Monte-Carlo process, we manage to define a photometric estimator which fits well the spectroscopic distribution of galaxies in the mock testing set, but with a larger scatter. To complete this work, we perform an analysis of the impact on the detection of clusters via density of galaxies in a field by using the photometric redshifts obtained with a non-representative training set.Comment: 19 pages, 9 figures. Accepted for publication in MNRA

Faktor-Faktor Yang Mempengaruhi Mahasiswa Tingkat III Semester V Dalam Menyelesaikan Target Pasien Komprehensif Di Klinik Pendidikan Jurusan Kesehatan Gigi Kupang

Pelayanan asuhan kesehatan gigi dan mulut diberikan kepada masyarakat yang bersifat komprehensif berupa kegiatan promotif, tindakan preventif dan kuratif sederhana, menyelesaikan hygiene pemeliharaan alat-alat kedokteran gigi dan lingkungan kerja. Untuk mengetahui faktor-faktor yang mempengaruhi mahasiswa tingkat III semester V dalam menyelesaikan target pasien komprehensif di klinik pendidikan jurusan kesehatan gigi kupang. Jenis penelitian ini menggunakan penelitian deskriptif yaitu penelitian yang dilakukan dengan tujuan untuk mendapatkan gambaran tentang jumlah mahasiswa yang mengerjakan pasien komprehensif di Klinik Pendidikan Jurusan Kesehatan Gigi Kupang. Motivasi mahasiswa dalam menyelesaikan target pasien komprehensif gigi dan mulut termasuk kategori baik (68,3%), pengetahuan mahasiswa dalam pelayanan asuhan keperawatan gigi dan mulut termasuk kategori kurang (40,5%), tingkat kooperatif pasien dalam pelayanan asuhan kesehatan gigi dan mulut termasuk kategori baik (68,3%). Motivasi mahasiswa dalam menyelesaikan target pasien komprehensif termasuk kategori baik (68,3%) karena mahasiswa berada pada usia kematangan dimana mahasiswa harus berusaha dalam menyelesaiakan target praktikum yang sedang dihadapi. Saran : Meningkatkan kemampuan dan keterampilan peserta didik dengan lebih memperbanyak praktikum serta meningkatkan mutu pelayanan di klinik

Computational Fluid Dynamics-Enabled Modelling and Optimisation of Coolant Flow through Helical Channels

Computational Fluid Dynamics (CFD) is used to investigate the effect of geometry and flow parameters on liquid flow in helical channels for conditions relevant to coolant flow in twist drilling applications. CFD predictions of pressure drop in circular and triangular channels are compared against three important experimental correlations and it is shown that the correlation due to Yamamoto et al. [1] is accurate for both circular and triangular channels. Numerical results show how pressure drop varies with pitch, torsion and arc length and how the regions of high velocity flow can be manipulated through helical orientation. A parametrisation of triangular channels is presented and a meta-model for pressure drop created which demonstrates clearly how this depends on corner radius and orientation. Results also show how the larger pressure drop associated with triangular channels, for a given target flow rate, can be reduced towards those for equivalent flows in circular channels by increasing cross-sectional area whilst reducing flow velocities accordingly

A mass threshold in the number density of passive galaxies at z∼\sim2

The process that quenched star formation in galaxies at intermediate and high redshift is still the subject of considerable debate. One way to investigate this puzzling issue is to study the number density of quiescent galaxies at z~2, and its dependence on mass. Here we present the results of a new study based on very deep Ks-band imaging (with the HAWK-I instrument on the VLT) of two HST CANDELS fields (the UKIDSS Ultra-deep survey (UDS) field and GOODS-South). The new HAWK-I data (taken as part of the HUGS VLT Large Program) reach detection limits of Ks>26 (AB mag). We select a sample of passively-evolving galaxies in the redshift range 1.4<z<2.5. Thanks to the depth and large area coverage of our imaging, we have been able to extend the selection of quiescent galaxies a magnitude fainter than previous analyses. Through extensive simulations we demonstrate, for the first time, that the observed turn-over in the number of quiescent galaxies at K>22 is real. This has enabled us to establish unambiguously that the number counts of quiescent galaxies at z~2 flatten and slightly decline at magnitudes fainter than Ks~22(AB mag.). We show that this trend corresponds to a stellar mass threshold $M_*10^{10.8}\,{\rm M_{\odot}}$ below which the mechanism that halts the star formation in high-redshift galaxies seems to be inefficient. Finally we compare the observed pBzK number counts with those of quiescent galaxies extracted from four different semi-analytic models. We find that none of the models provides a statistically acceptable description of the number density of quiescent galaxies at these redshifts. We conclude that the mass function of quiescent galaxies as a function of redshift continues to present a key and demanding challenge for proposed models of galaxy formation and evolution.Comment: Accepted for publication on Astronomy and Astrophysic

Hungry for change: the Sydney Food Fairness Alliance

The Sydney Food&nbsp;Fairness&nbsp;Alliance is one of a growing number of nascent food movements in Australia to have emerged out of concern for the country’s food future, as well as the deleterious effect the present food system is having on its citizens’ health and the continent’s fragile environment. The Alliance’s structure and activities clearly position it as a new social movement (NSM) engaged in collective action on a specific issue, in this instance, food security/justice, and operating outside the political sphere while aiming to influence and affect societal change.&nbsp;Food security&nbsp;as a human right lies at the heart of the Alliance’s philosophy, and equitable, sustainable food policies for&nbsp;New South Wales&nbsp;are a core focus of its advocacy work. The authors argue that the Alliance is a distinctive food movement in that it positions itself as an \u27umbrella\u27 organization representing a wide range of stakeholders in the food system. This chapter reflects on the values, achievements, issues of concern, strengths and weaknesses, and future of the Sydney Food&nbsp;Fairness Alliance. This resource is Chapter 8 in \u27Food Security in Australia:&nbsp;Challenges and Prospects for the Future\u27 published by Springer in 2013