3,404 research outputs found
Investigation of the shape transferability of nanoscale multi-tip diamond tools in the diamond turning of nanostructures
No full textIn this article, the shape transferability of using nanoscale multi-tip diamond tools in the diamond turning for scale-up manufacturing of nanostructures has been demonstrated. Atomistic multi-tip diamond tool models were built with different tool geometries in terms of the difference in the tip cross-sectional shape, tip angle, and the feature of tool tip configuration, to determine their effect on the applied forces and the machined nano-groove geometries. The quality of machined nanostructures was characterized by the thickness of the deformed layers and the dimensional accuracy achieved. Simulation results show that diamond turning using nanoscale multi-tip tools offers tremendous shape transferability in machining nanostructures. Both periodic and non-periodic nano-grooves with different cross-sectional shapes can be successfully fabricated using the multi-tip tools. A hypothesis of minimum designed ratio of tool tip distance to tip base width (L/Wf) of the nanoscale multi-tip diamond tool for the high precision machining of nanostructures was proposed based on the analytical study of the quality of the nanostructures fabricated using different types of the multi-tip tools. Nanometric cutting trials using nanoscale multi-tip diamond tools (different in L/Wf) fabricated by focused ion beam (FIB) were then conducted to verify the hypothesis. The investigations done in this work imply the potential of using the nanoscale multi-tip diamond tool for the deterministic fabrication of period and non-periodic nanostructures, which opens up the feasibility of using the process as a versatile manufacturing technique in nanotechnology
Development of the Liang Handover Assessment Tool for Simulation (L-HATS)
No full textThe general metadata -- e.g., title, author, abstract, subject headings, etc. -- is publicly available, but access to the submitted files is restricted to UT Southwestern campus access and/or authorized UT Southwestern users.INTRODUCTION: Clinical handovers are critical to patient safety and outcomes. Handover simulation prepares healthcare students for handoffs in the clinical setting upon graduation. UT Southwestern has developed a longitudinal handover educational curriculum in which student handovers will be assessed. Although valid and reliable tools exist for assessing clinical handovers, assessment tools adapted for the undergraduate simulation environment currently do not exist. Our objective was to develop a reliable and valid assessment tool that could be used by scholarly healthcare students to assess undergraduate simulated handovers throughout the longitudinal handover education curriculum.
METHODS: A literature review was conducted to identify critical elements of high-quality, effective handovers. Following the tool's creation, we underwent several PDSA cycles to optimize the tool for medical student evaluation and ease of grading. Grader inclusion criteria were students who had completed the transition to clerkship (T2C) handover activity. A training curriculum was developed to train graders on proper use of the tool and to promote reliable grading with the tool. 62 pre-clinical student handovers were conducted in the simulation setting and recorded. The handovers were stratified into three levels (low, intermediate, and high quality), and 10 handovers were selected from each of the three levels for grading (30 handovers total). Each handover was scored by four clerkship medical students "graders". Two-way random effects intra-class correlation coefficients (ICC) were used to establish inter-rater reliability and inter-rater agreement among graders using the tool. Three external handover experts were used to establish the tool's validity using face validity.
RESULTS: The product of this project is Liang Handover Assessment Tool for Simulation (L-HATS) which evaluated three domains: handover content, handover process, and language with a maximum score of 28. Two-way random effects ICC for agreement was 0.804, 95% CI [0.601, 0.906]. Two-way random effects ICC for reliability was 0.866, 95% CI [0.765, 0.930]. Three external handover experts have sufficiently validated the tool.
CONCLUSIONS: The L-HATS had good to excellent inter-rater reliability and agreement. The L-HATS is the first reliable and valid handover assessment tool used for undergraduate simulation education. By using a two-way random effects model, the results suggest that the tool can be used in settings outside of the T2C handover simulation activity. Having good to excellent absolute agreement suggests that the tool is suitable for assigning grades. Future studies include comparing faculty vs student grading of handovers as well as evaluating the tool in the clinical setting
Caridina disparidentata Liang, Yan and Wang 1984
No full text<i>Caridina disparidentata</i> Liang, Yan and Wang, 1984 <p>(®gure 5)</p> <p> <i>Caridina disparidentata</i> Liang, Yan and Wang, 1984: 254, ®gures 1±12 (type locality: Shihuiyao reservoir, Qujing County, Yunnan).</p> <p> <i>Caridina heterodentata</i> Liang, Yan and Wang, in Liang and Yan, 1985: 196.</p> <p> <i>Material examined</i></p> <p>HOLOTYPE:, l bl. 21 mm (SFU: 83-67-01), Shihuiyao reservoir, Qujing County, Yunnan (SFU).</p> <p>PARATYPES: One m, cl. 6.0 mm (SFU: 83-67-02), data same as holotype.</p> <p> <i>Other specimens.</i> Four ll, cl. 4.2±6.2 mm, two mm, cl. 5.0± 7.4 mm, Maoshan village near Kunming city, Yunnan; July 1978; one m, cl. 5.0 mm, river at Jiankang farm, Maguan County, Yunnan (IZAS).</p> <p> <i>Diagnosis</i></p> <p> Rostrum straight, reaching to middle of second segment or end of antennular peduncle. Teeth arrangement extremely variable, armed dorsally with two to 11 teeth, all on carapace, rostrum, or on both carapace and rostrum, ventrally with zero to seven teeth (mode 3±5). Antennular peduncle <i>ca</i> 0.5 times as long as carapace. Carpus of ®rst pereiopod 1.9±2.2 times as long as high, chela 2.1±2.2 times as long as broad. Carpus of second pereiopod 3.7±4.2 times as long as high, chela 2.5±2.7 times as long as broad. Propodus of third pereiopod 3.4±3.8 times as long as dactylus, dactylus with six to seven spinules. Propodus of ®fth pereiopod 3.5±3.9 times as long as dactylus, dactylus with 37±40 spinules. Endopod of male ®rst pleopod subrectangular, <i>ca</i> 3.5 times as long as wide, appendix interna reaching to distal end of endopod. Appendix interna of male second pleopod short, less than 0.25 times as long as appendix masculina. Uropodal diaeresis with 15±18 teeth. Egg size 1.31± 1.40 <i>Ö</i> 0.81±0.98 mm in diameter.</p> <p> <i>Remarks</i></p> <p> <i>Caridina disparidentata</i> diOEers from <i>C. yunnanensi s</i> in the form of the rostrum, which is more variable in the teeth arrangement; the longer dactylus of the third (propodus 3.4±3.8 times as long as dactylus vs 4.0±4.5 times in <i>C. yunnanensi s</i>) and ®fth pereiopods (propodus 3.5±3.9 times as long as dactylus vs 3.8±4.5 times in <i>C. yunnanensi s</i>), the longer endopod of male ®rst pleopod (3.5 times as long as broad vs 2.8±3.0 times) and the short appendix interna (0.25 times as long as appendix masculina vs 0.33 in <i>C. yunnanensi s</i>).</p> <p> There is some confusion over the correct name for this species. The species was ®rst validly described by Liang <i>et al.</i> (1984) as <i>C. disparidentata</i> from Yunnan. These authors had used a diOEerent manuscript name, <i>C. heterodentata</i>, for the species; the label with this name was still kept with the types of <i>C. disparidentata</i> when the ®rst author examined the material in SFU. But when they published their paper (Liang <i>et al.</i>, 1984), however, they changed its name to <i>C. disparidentata</i>. In a later paper reviewing the <i>Caridina</i> species from Yunnan, however, Liang and Yan (1985) erroneously used their original but unpublished name, <i>C. heterodentata</i>, for the species, apparently forgetting that they had used the name <i>C. disparidentata</i> in their 1984 publication! <i>Caridina heterodentata</i> Liang and Yan, 1985, must thus be regarded as an unjusti®ed emendation of <i>C. disparidentata</i> Liang, Yan and Wang, 1984. As both names utilize the same type specimens, both names are objective synonyms and <i>Caridina disparidentat a</i> Liang, Yan and Wang, 1984, is the valid name.</p> <p> <i>Habitat</i></p> <p> Found in reservoirs (Liang <i>et al.</i>, 1984), mountain streams and small rivers (Y. Duan, personal communication).</p> <p> <i>Distribution</i> Qujing, Maguan Counties and near Kunming city, Yunnan (®gure 1).</p>Published as part of <i>Ng, Y. Cai and P. K. L. & Ng, Cai P. K. L., 2010, revision of Caridina yunnanensis and its allied species (Crustacea: Decapoda: Caridea: Atyidae) from Yunnan, southern China, with description of one new species, pp. 213-227 in Journal of Natural History 35</i> on pages 218-219, DOI: 10.1080/00222930150215341, <a href="http://zenodo.org/record/10083275">http://zenodo.org/record/10083275</a>
The design of a radio altimeter using frequency modulation method
No full textThesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering, 1937 [second author], and Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautical Engineering, 1937 [first author].MICROFICHE COPY AVAILABLE IN ENGINEERING.Includes bibliographical references (leaves 108-110).by Shih-Nge Lin, Ieu-Liang Wu.M.S
Investigation of a scale-up manufacturing approach for nanostructures by using a nanoscale multi-tip diamond tool
No full textIncreasing interest in commercializing functional nanostructured devices heightens the need for cost-effective manufacturing approaches for nanostructures. This paper presents an investigation of a scale-up manufacturing approach for nanostructures through diamond turning using a nanoscale multi-tip diamond tool (four tip tool with tip width of 150 nm) fabricated by focused ion beam (FIB). The manufacturing capacity of this new technique is evaluated through a series of cutting trials on copper substrates under different cutting conditions (depth of cut 100–500 nm, spindle speed 12–120 rpm). The machined surface roughness and nanostructure patterns are measured by using a white light interferometer and a scanning electron microscope, respectively. Results show that the form accuracy and integrity of the machined nanostructures were degraded with the increase of the depth of cut and the cutting speed. The burr and the structure damage are two major machining defects. High precision nano-grooves (form error of bottom width < 6.7 %) was achieved when a small depth of cut of 100 nm was used (spindle speed = 12 rpm). Initial tool wear was found at both the clearance cutting edge and the side edges of tool tips after a cutting distance of 2.5 km. Moreover, the nanometric cutting process was emulated by molecular dynamic (MD) simulations. The research findings obtained from MD simulation reveal the underlying mechanism for machining defects and the initialization of tool wear observed in experiments.</p
Mellin-Transform-Based Performance Analysis of FFH -ary FSK Using Product Combining for Combatting Partial-Band Noise Jamming
No full textFailure analysis, modeling, and prediction for BlueGene/L
No full textThe growing computational and storage needs of scientific applications mandate the deployment of extreme-scale parallel machines, such as IBM's BlueGene/L, a 64K dual-core processor system. One of the challenges of designing and deploying such systems in a production setting is the need to take failure occurrences into account. Once the large scale system equipped with a failure predictability, the fault tolerance and resource management strategies of the system can be improved significantly, and its performance can be highly increased.
This dissertation is based on the Reliability, Availability and Serviceabilit (RAS) events generated by IBM BlueGene/L over a period of 142 days. Using these logs, we performed failure analysis, modeling, and prediction. Filters are created to reveal the system failure behaviors, three preliminary models are identified for the failures, and finally, three failure predictors are established for the system. We heavily use data mining and time series analysis techniques for this dissertation. Our comprehensive evaluation demonstrates that our Bi-Modal Nearest Neighbor predictor greatly outperforms the other two (RIPPER and LIBSVM based), leading
to an F-measure of 70% and 50% for a 12-hour and 6-hour prediction window size.Ph.D.Includes bibliographical references (p. 123-127)
Erratum to: Is Sensory Loss an Understudied Risk Factor for Frailty? A Systematic Review and Meta-analysis
No full textIn the article “Is Sensory Loss an Understudied Risk Factor for Frailty? A Systematic Review and Meta-analysis,” an author was missing. Ana Maseda should be listed as the 11th author. The correct author list is: Benjamin Kye Jyn Tan, Ryan Eyn Kidd Man, Alfred Tau Liang Gan, Eva K Fenwick, Varshini Varadaraj, Bonnielin K Swenor, Preeti Gupta, Tien Yin Wong, Caterina Trevisan, Laura Lorenzo-López, Ana Maseda, José Carlos Millán-Calenti, Carla Helena Augustin Schwanke, Ann Liljas, Soham Al Snih, Yasuharu Tokuda, Ecosse Luc Lamoureux. This error has been corrected
3-O-methyldopa levels in newborns: Result of newborn screening for aromatic L-amino-acid decarboxylase deficiency
No full textBackground: The diagnosis of aromatic L-amino-acid decarboxylase (AADC) deficiency is often delayed because a cerebrospinal fluid analysis is required to detect a neurotransmitter deficiency. We here demonstrated that an elevated concentration of L-dopa metabolite 3-O-methyldopa (3-O-MD) in dried blood spots could be integrated into newborn screening program to precisely predict AADC deficiency. ;Methods: After obtaining parental consent, an additional spot was punched from newborn filter paper, eluted, cleaned, and analyzed by tandem mass spectrometry. Newborns with a 3-O-MD concentration exceeding 500 ng/mL were referred for confirmatory testing. ;Results: From September 2013 to December 2015, 127,987 newborns were screened for AADC deficiency. The mean 3-OMD concentration in these newborns was 88.08 ng/mL (SD = 27.74 ng/mL). Four newborns exhibited an elevated 3-OMD concentration (range, 939-3241 ng/mL). All four newborns were confirmed to carry two pathologic DDC mutations, indicating an incidence of AADC deficiency of 1:32,000. During the follow-up period, three patients developed typical symptoms of AADC deficiency. Among 16 newborns with mildly elevated 3-OMD levels, six were heterozygous for the DDC IVS6 + 4A > T mutation. ;Conclusion: Newborn screening of AADC deficiency was achieved with a 100% positive-predictive rate. An association for gestational age could be further elucidated. (C) 2016 Elsevier Inc. All rights reserved
Finite-length performance analysis of LDPC coded continuous phase modulation
No full textSerial concatenation of LDPC codes and continuous phase modulation (CPM) has recently gained significant attention due to its capacity-approaching performance, efficient detection as well as owing to its constant-envelope nature. Most of the previous contributions on LDPC coded CPM were devoted to the design of LDPC codes and their asymptotic performance analysis. However, there is a paucity of work on the finite-length performance estimation of LDPC coded CPM, primarily because existing performance estimation techniques cannot be readily applied to the LDPC coded CPM. To fill this gap, we conceive an analytical bit error probability estimation technique for finite-length LDPC coded CPM in the waterfall region. Numerical results are provided both for regular and irregular LDPC codes having different codeword lengths, demonstrating that the estimated performances are closely matched by the simulated ones. </p
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