WorldWideScience

Sample records for cutting edge technology

  1. Cutting edge technology to enhance nursing classroom instruction at Coppin State University.

    Science.gov (United States)

    Black, Crystal Day; Watties-Daniels, A Denyce

    2006-01-01

    Educational technologies have changed the paradigm of the teacher-student relationship in nursing education. Nursing students expect to use and to learn from cutting edge technology during their academic careers. Varied technology, from specified software programs (Tegrity and Blackboard) to the use of the Internet as a research medium, can enhance student learning. The authors provide an overview of current cutting edge technologies in nursing classroom instruction and its impact on future nursing practice.

  2. Cutting-Edge Technologies and Social Media Use in Higher Education

    Science.gov (United States)

    Benson, Vladlena, Ed.; Morgan, Stephanie

    2014-01-01

    The inclusion of social media in higher education has transformed the way instructors teach and students learn. In order to effectively reach their students in this networked world, teachers must learn to utilize the latest technologies in their classrooms. "Cutting-Edge Technologies and Social Media Use in Higher Education" brings…

  3. Cutting-Edge Technologies and Social Media Use in Higher Education

    Science.gov (United States)

    Benson, Vladlena, Ed.; Morgan, Stephanie

    2014-01-01

    The inclusion of social media in higher education has transformed the way instructors teach and students learn. In order to effectively reach their students in this networked world, teachers must learn to utilize the latest technologies in their classrooms. "Cutting-Edge Technologies and Social Media Use in Higher Education" brings…

  4. Advantages of Picosecond Laser Machining for Cutting-Edge Technologies

    Science.gov (United States)

    Moorhouse, C.

    The demand to reduce the size, weight and material cost of modern electronic devices results in a requirement for precision micromachining to aid product development. Examples include making smaller and more powerful smartphones with brighter displays, eliminating the requirement for post-process cleaning and machining the latest bio- absorbable medical stents. The pace of innovation in high-tech industries has led to ultrafast (picosecond) industrial lasers becoming an important tool for many applications and the high repetition rates now available help to meet industrial throughput levels. This is due to the unique operating regime (megawatts of peak power) enabling clean cutting and patterning of sensitive materials and thin films used in a number of novel devices and allows micromachining of wide bandgap, "difficult" materials such as glass.

  5. Cutting-edge technology may yield elephants in Orphan basin

    Energy Technology Data Exchange (ETDEWEB)

    Reid, W.

    2006-10-15

    Controlled source electromagnetic survey (CSEM) technology may soon supply vital information to oil companies about Newfoundland's offshore basins. The technology shoots low-frequency electromagnetic signals at the sea-floor to measure resistivity. Natural gas, crude oil and water each have a particular strength to resist the power of an electromagnetic signal, and leave a unique signature. To collect data, the electromagnetic pulse emitter is towed back and forth over an area of seabed potentially holding hydrocarbons. Connected to the ship by a long tether, the emitter hangs approximately 30 to 50 m above the ocean floor, and reaches depths of 2.4 km. The sea floor has 36 receivers anchored to it in a grid of concrete blocks that dissolve within 3 months of installation. The test blocks are first dropped overboard to verify current speed and strength in order to calculate exactly where on the water's surface the concrete blocks will be lowered. The Canada Newfoundland and Labrador Offshore Petroleum Board (CNLOPB) has deemed the technology environmentally safe. Eight land parcels have now been leased for exploration in the Orphan Basin and are expected to receive approval for seismic and electromagnetic surveys. Industry players have shown unusual optimism about the basin's potential, which is estimated to contain 4 oilfields containing a billion barrels of oil each. 2 figs.

  6. Enabling cutting-edge semiconductor simulation through grid technology.

    Science.gov (United States)

    Reid, Dave; Millar, Campbell; Roy, Scott; Roy, Gareth; Sinnott, Richard; Stewart, Gordon; Stewart, Graeme; Asenov, Asen

    2009-06-28

    The progressive scaling of complementary metal oxide semiconductor (CMOS) transistors drives the success of the global semiconductor industry. Detailed knowledge of transistor behaviour is necessary to overcome the many fundamental challenges faced by chip and systems designers. Grid technology has enabled the unavoidable statistical variations introduced by scaling to be examined in unprecedented detail. Over 200 000 transistors have been simulated, the results of which provide detailed insight into underlying physical processes. This paper outlines recent scientific results of the nanoCMOS project and describes the way in which the scientific goals have been reflected in the grid-based e-Infrastructure.

  7. Energy technologies at the cutting edge: international energy technology collaboration IEA Implementing Agreements

    Energy Technology Data Exchange (ETDEWEB)

    Pottinger, C. (ed.)

    2007-05-15

    Ensuring energy security and addressing climate change issues in a cost-effective way are the main challenges of energy policies and in the longer term will be solved only through technology cooperation. To encourage collaborative efforts to meet these energy challenges, the IEA created a legal contract - Implementing Agreement - and a system of standard rules and regulations. This allows interested member and non-member governments or other organisations to pool resources and to foster the research, development and deployment of particular technologies. For more than 30 years, this international technology collaboration has been a fundamental building block in facilitating progress of new or improved energy technologies. There are now 41 Implementing Agreements. This is the third in the series of publications highlighting the recent results and achievements of the IEA Implementing Agreements. This document is arranged in the following sections: Cross-cutting activities (sub-sectioned: Climate technology initiative; Energy Technology Data Eexchange; and Energy technology systems analysis programme); End-use technologies (sub-sectioned: Buildings; Electricity; Industry; and Transport; Fossil fuels (sub-sectioned: Clean Coal Centre; Enhanced oil recovery Fluidized bed conversion; Greenhouse Gas R & D; Multiphase flow sciences); Fusion power; Renewable energies and hydrogen; and For more information (including detail on the IEA energy technology network; IEA Secretariat Implementing Agreement support; and IEA framework. Addresses are given for the Implementing Agreements. The publication is based on core input from the Implementing Agreement Executive Committee.

  8. On the Cutting Edge: Movements and Institutional Examples of Technological Disruption

    Science.gov (United States)

    Leon, Marjorie Roth; Price, Todd Alan

    2016-01-01

    This chapter describes technological disruptions in higher education that pose challenges and offer opportunities to college and university students, faculty, and administrators. It provides examples of innovative responses being explored by 2-year and 4-year higher education institutions.

  9. Shared Investment by NIS and National Labs Develops Cutting-Edge Safeguards Technologies

    Energy Technology Data Exchange (ETDEWEB)

    Anheier, Norman C.; Williams, Laura S.

    2012-04-01

    This article, regarding a new technology for detecting undeclared enrichment at gas centrifuge enrichment plants, was written for the DOE/NNSA NA-24 Highlights, a newsletter intended for public release.

  10. Putting agricultural equipment and digital technologies at the cutting edge of agroecology

    Directory of Open Access Journals (Sweden)

    Bellon Maurel Véronique

    2017-05-01

    Full Text Available The agro-ecological transition is an ambitious challenge. It can be met by implementing the fundamentals of agroecology (use of biodiversity, integration of agriculture in landscapes, closure of flow loops in the context of a broad and renewed offer of technologies: agro-equipment, biotechnology, digital technologies… This article explores the role that agro-equipment and digital services can play in this transition. These technologies contribute through various levers to the agro-ecological transition: by improving farming efficiency (more service rendered for the same environmental impact, by precision farming (adaptation of the operations to the needs of the plant or the animal based on a monitoring–diagnosis–recommendation cycle and by the development of specialized machinery helping the farmer to achieve “flow loop-closing” (at the plot level, by maintaining the soil quality, or at the farm level, with the recycling of organic effluents or to take advantage of biodiversity (e.g., with agro-equipment adapted to mixed crops. The technological bricks that are requested and for which advances are expected are: sensors (to measure plant or animal needs and associated digital technologies (information transfer, data processing, precision technologies for input application, robotics, specialized machines to manage soil cover and weeds, or for agroforestry. The brakes and engines for innovation in agro-equipment are studied. The brakes are the generally small structure of the farm manufacturing companies, the deficit of the demand from farmers and the complexity − either real or perceived − of these equipments. To encourage innovation, several levers are to be used: involving users in the design of agro-equipments, creating financial incentives for innovative equipment purchase, and training end-users, prescribers and dealers to the high potential of these new technologies. In conclusion, putting agro-equipment and digital technology

  11. Cutting-edge technology for public health workforce training in comparative effectiveness research.

    Science.gov (United States)

    Salinas-Miranda, Abraham A; Nash, Michelle C; Salemi, Jason L; Mbah, Alfred K; Salihu, Hamisu M

    2013-06-01

    A critical mass of public health practitioners with expertise in analytic techniques and best practices in comparative effectiveness research is needed to fuel informed decisions and improve the quality of health care. The purpose of this case study is to describe the development and formative evaluation of a technology-enhanced comparative effectiveness research learning curriculum and to assess its potential utility to improve core comparative effectiveness research competencies among the public health workforce. Selected public health experts formed a multidisciplinary research collaborative and participated in the development and evaluation of a blended 15-week comprehensive e-comparative effectiveness research training program, which incorporated an array of health informatics technologies. Results indicate that research-based organizations can use a systematic, flexible, and rapid means of instructing their workforce using technology-enhanced authoring tools, learning management systems, survey research software, online communities of practice, and mobile communication for effective and creative comparative effectiveness research training of the public health workforce.

  12. Aura of technology and the cutting edge: a history of lasers in neurosurgery.

    Science.gov (United States)

    Ryan, Robert W; Spetzler, Robert F; Preul, Mark C

    2009-09-01

    In this historical review the authors examine the important developments that have led to the availability of laser energy to neurosurgeons as a unique and sometimes invaluable tool. They review the physical science behind the function of lasers, as well as how and when various lasers based on different lasing mediums were discovered. They also follow the close association between advances in laser technology and their application in biomedicine, from early laboratory experiments to the first clinical experiences. Because opinions on the appropriate role of lasers in neurosurgery vary widely, the historical basis for some of these views is explored. Initial enthusiasm for a technology that appears to have innate advantages for safe resections has often given way to the strict limitations and demands of the neurosurgical operating theater. However, numerous creative solutions to improve laser delivery, power, safety, and ergonomics demonstrate the important role that technological advances in related scientific fields continue to offer neurosurgery. Benefiting from the most recent developments in materials science, current CO(2) laser delivery systems provide a useful addition to the neurosurgical armamentarium when applied in the correct circumstances and reflect the important historical advances that come about from the interplay between neurosurgery and technology.

  13. Recombinant yeast technology at the cutting edge: robust tools for both designed catalysts and new biologicals.

    Science.gov (United States)

    Kovar, Karin; Looser, Verena; Hyka, Petr; Merseburger, Tobias; Meier, Christian

    2010-01-01

    Health and safety concerns, enhanced quality criteria, and environmental sustainability, have prompted investigations into production using recombinant yeasts as a feasible alternative for isolation of proteins from natural animal or plant sources, as well as for processes utilising either mammalian cell cultures or bacterial systems. An overview of recent research papers and review articles provides readers with a comprehensive insight into the field of next-generation yeast expression systems. Major breakthroughs in recombinant yeast technology linked to Pichia pastoris are (i) the public availability of tools to generate proteins with tailored and highly homogenous N-glycan structures, similar to the forms assembled in humans, (ii) the recent accomplishment of the annotation of its genome sequence, and finally, (iii) the presence of the first few (non-glycosylated) therapeutic proteins in Pichia on the market. The P. pastoris expression platform is now well developed, as proven by multiple products used in human and veterinary medicine and in industry (e.g., enzymes for chemical synthesis and for the modification/synthesis of pharmaceuticals, drug target proteins used for structural analysis or for high throughput screening, proteins for diagnostics, proteinous biomaterials, vaccines, and therapeutic proteins). Nevertheless, the complexity of protein analysis (monitoring) continues to restrict process development for recombinant products. Drawing on combined expertise in molecular biology and process technology, the Institute of Biotechnology (IBT) at the Zurich University of Applied Science (ZHAW) and its international partners have developed solutions which (i) fully eliminate (or partially reduce) the use of methanol, which is undesirable in high-cell-density and high-productivity processes, (ii) match both strain construction and process design with the target protein characteristics to the benefit of the cells' physiological shape, and (iii) allow multi

  14. Cutting Edge Localisation in an Edge Profile Milling Head

    NARCIS (Netherlands)

    Fernandez Robles, Laura; Azzopardi, George; Alegre, Enrique; Petkov, Nicolai

    2015-01-01

    Wear evaluation of cutting tools is a key issue for prolonging their lifetime and ensuring high quality of products. In this paper, we present a method for the effective localisation of cutting edges of inserts in digital images of an edge profile milling head. We introduce a new image data set of 1

  15. Cutting edge issues in autoimmune gastritis.

    Science.gov (United States)

    Toh, Ban-Hock; Chan, James; Kyaw, Tin; Alderuccio, Frank

    2012-06-01

    Autoimmune gastritis is the outcome of a pathological CD4 T cell-mediated autoimmune response directed against the gastric H/K-ATPase. Silent initially, the gastric lesion becomes manifest in humans by the development of megaloblastic pernicious anemia arising from vitamin B12 deficiency. Cutting edge issues in this disease relate to its epidemiology, immunogenetics, a role for Helicobacter pylori as an infective trigger through molecular mimicry, its immunopathogenesis, associated organ-specific autoimmune diseases, laboratory diagnosis, and approaches to curative therapy.

  16. Cutting-edge CMP modeling for front-end-of-line (FEOL) and full stack hotspot detection for advanced technologies

    Science.gov (United States)

    Katakamsetty, Ushasree; Chee, Jiansheng Jansen; Li, Yongfu; Hui, Chiu Wing; Huang, Yaodong; de la Garza, Ernesto Gene

    2017-03-01

    As process technology scales down, the number of Chemical Mechanical Polishing (CMP) processes and steps used in chip manufacturing are increasing exponentially. Shrinking process margins increase the risk of excessive metal or oxide thickness or topography variations, causing potential yield problems such as dishing, erosion, resist lifting or printability issues. Present DFM CMP modeling and applications mainly focus on the hotspot detection and fixing methodology for the Back-End-Of-Line (BEOL) layers [1]. Today, the present methodology is no longer sufficient to eliminate all the CMP related manufacturing defects. There is a strong demand for STI, poly and contact silicon calibrated CMP models to predict and fix the related CMP hotspots. Shallow Trench Isolation (STI) and Poly CMP planarity is very critical in advanced technologies with Diffusion layer FIN structures and Replacement Metal Gate Process flow [2]. Gate uniformity after CMP will improve device performance, reduce CMP defects and increases the yield. Contact (Tungsten) CMP polishing is another important step that defines contact planarity, which will influence metal layer CMP planarization [3]. This paper will discuss design dependent CMP variations for STI, Poly and Contact CMP steps and showcase the importance of FEOL CMP modeling. We present the methodology for Silicon calibrated STI CMP, Poly and Contact CMP models and the applications of FEOL CMP models in CMP dishing and erosion hotspot analysis. We also present FEOL plus BEOL multi stack CMP simulations applications and provide design guidelines to fix CMP hotspots.

  17. Application of Cutting-Edge 3D Seismic Attribute Technology to the Assessment of Geological Reservoirs for CO2 Sequestration

    Energy Technology Data Exchange (ETDEWEB)

    Christopher Liner; Jianjun Zeng; Po Geng Heather King Jintan Li; Jennifer Califf; John Seales

    2010-03-31

    The goals of this project were to develop innovative 3D seismic attribute technologies and workflows to assess the structural integrity and heterogeneity of subsurface reservoirs with potential for CO{sub 2} sequestration. Our specific objectives were to apply advanced seismic attributes to aide in quantifying reservoir properies and lateral continuity of CO{sub 2} sequestration targets. Our study area is the Dickman field in Ness County, Kansas, a type locality for the geology that will be encountered for CO{sub 2} sequestration projects from northern Oklahoma across the U.S. midcontent to Indiana and beyond. Since its discovery in 1962, the Dickman Field has produced about 1.7 million barrels of oil from porous Mississippian carbonates with a small structural closure at about 4400 ft drilling depth. Project data includes 3.3 square miles of 3D seismic data, 142 wells, with log, some core, and oil/water production data available. Only two wells penetrate the deep saline aquifer. Geological and seismic data were integrated to create a geological property model and a flow simulation grid. We systematically tested over a dozen seismic attributes, finding that curvature, SPICE, and ANT were particularly useful for mapping discontinuities in the data that likely indicated fracture trends. Our simulation results in the deep saline aquifer indicate two effective ways of reducing free CO{sub 2}: (a) injecting CO{sub 2} with brine water, and (b) horizontal well injection. A tuned combination of these methods can reduce the amount of free CO{sub 2} in the aquifer from over 50% to less than 10%.

  18. High-throughput next-generation sequencing technologies foster new cutting-edge computing techniques in bioinformatics.

    Science.gov (United States)

    Yang, Mary Qu; Athey, Brian D; Arabnia, Hamid R; Sung, Andrew H; Liu, Qingzhong; Yang, Jack Y; Mao, Jinghe; Deng, Youping

    2009-07-07

    The advent of high-throughput next generation sequencing technologies have fostered enormous potential applications of supercomputing techniques in genome sequencing, epi-genetics, metagenomics, personalized medicine, discovery of non-coding RNAs and protein-binding sites. To this end, the 2008 International Conference on Bioinformatics and Computational Biology (Biocomp) - 2008 World Congress on Computer Science, Computer Engineering and Applied Computing (Worldcomp) was designed to promote synergistic inter/multidisciplinary research and education in response to the current research trends and advances. The conference attracted more than two thousand scientists, medical doctors, engineers, professors and students gathered at Las Vegas, Nevada, USA during July 14-17 and received great success. Supported by International Society of Intelligent Biological Medicine (ISIBM), International Journal of Computational Biology and Drug Design (IJCBDD), International Journal of Functional Informatics and Personalized Medicine (IJFIPM) and the leading research laboratories from Harvard, M.I.T., Purdue, UIUC, UCLA, Georgia Tech, UT Austin, U. of Minnesota, U. of Iowa etc, the conference received thousands of research papers. Each submitted paper was reviewed by at least three reviewers and accepted papers were required to satisfy reviewers' comments. Finally, the review board and the committee decided to select only 19 high-quality research papers for inclusion in this supplement to BMC Genomics based on the peer reviews only. The conference committee was very grateful for the Plenary Keynote Lectures given by: Dr. Brian D. Athey (University of Michigan Medical School), Dr. Vladimir N. Uversky (Indiana University School of Medicine), Dr. David A. Patterson (Member of United States National Academy of Sciences and National Academy of Engineering, University of California at Berkeley) and Anousheh Ansari (Prodea Systems, Space Ambassador). The theme of the conference to promote

  19. Involving Minority High School Students in Cutting Edge Research through C-DEBI, an NSF-National Science and Technology Center

    Science.gov (United States)

    Singer, E.; Edwards, K. J.

    2012-12-01

    The Center for Dark Energy Biosphere Investigations (C-DEBI) was established as a National Science and Technology Center (NTC) funded by NSF in 2009. Its mission is to explore life beneath the seafloor and make transformative discoveries that advance science, benefit society, and inspire people of all ages and origins. Thanks to the multi-institutional character of C-DEBI, the Center has not only started a collaborative framework for experimental and exploratory research, but also targets education programs at the K-12, undergraduate, graduate and postdoctoral levels involving biogeochemists, microbiologists, geochemists and geologists. An example for this is the introduction of deep biosphere research into the K-12 classroom. In this context, C-DEBI has collaborated with teachers from the Animo Leadership High School in Inglewood, which is ranked 27th within California and has a total minority enrollment of 99%, to adapt Marine Biology classes and introduce latest Deep Biosphere Science discoveries. Three high school students participated in a pilot project over 6 months to gain hands-on experience in an ongoing study in a Marine Microbiology laboratory at University of Southern California. Graduate and postdoctoral students from the Departments of Biological and Earth Sciences supervised theory, praxis and project design, which was aimed at culturing strains of Marinobacter, one of the most ubiquitous marine microbial genera, and preparing extracted DNA for sequencing using the latest Ion Torrent Technology. Students learned about the interdisciplinary global context of the study and gained experience in laboratory procedures, including basic aseptical techniques, molecular biology methods, and cutting-edge sequencing Technology, as well as problem-solving and creative thinking in project preparation and conduction. This hands-on training included discussions about the 'Whys' and 'Hows' in today's research with respect to their specific project, but also from a

  20. AHM cutting expenses, adding technology.

    Science.gov (United States)

    Lutz, S

    1990-04-30

    American Healthcare Management, emerging from bankruptcy protection is cutting corporate costs and expanding into new technology to attract more private-paying patients and lessen dependence on Medicare business.

  1. Cutting-Edge High-Power Ultrafast Thin Disk Oscillators

    Directory of Open Access Journals (Sweden)

    Thomas Südmeyer

    2013-04-01

    Full Text Available A growing number of applications in science and industry are currently pushing the development of ultrafast laser technologies that enable high average powers. SESAM modelocked thin disk lasers (TDLs currently achieve higher pulse energies and average powers than any other ultrafast oscillator technology, making them excellent candidates in this goal. Recently, 275 W of average power with a pulse duration of 583 fs were demonstrated, which represents the highest average power so far demonstrated from an ultrafast oscillator. In terms of pulse energy, TDLs reach more than 40 μJ pulses directly from the oscillator. In addition, another major milestone was recently achieved, with the demonstration of a TDL with nearly bandwidth-limited 96-fs long pulses. The progress achieved in terms of pulse duration of such sources enabled the first measurement of the carrier-envelope offset frequency of a modelocked TDL, which is the first key step towards full stabilization of such a source. We will present the key elements that enabled these latest results, as well as an outlook towards the next scaling steps in average power, pulse energy and pulse duration of such sources. These cutting-edge sources will enable exciting new applications, and open the door to further extending the current performance milestones.

  2. Scaling Community College Interventions. Cutting Edge Series. No. 2

    Science.gov (United States)

    Public Agenda, 2011

    2011-01-01

    This is the second guide of the Cutting Edge Series and is designed to help colleges apply strategies that will allow successful institutional change and student achievement initiatives to reach more students. Section 1 of this guide lays out the most common obstacles to successful scaling and serves as a sobering reminder of the complexity of the…

  3. Cutting-edge issues in autoimmune orchitis.

    Science.gov (United States)

    Silva, Clovis A; Cocuzza, Marcello; Borba, Eduardo F; Bonfá, Eloísa

    2012-04-01

    Autoimmune orchitis is a relevant cause of decreased fecundity in males, and it is defined as a direct aggression to the testis with the concomitant presence of anti-sperm antibodies (ASA). The presence of these specific antibodies has been observed in approximately 5-12% of infertile male partners. Primary autoimmune orchitis is defined by isolated infertility with ASA but without evidence of a systemic disease. Secondary causes of orchitis and/or testicular vasculitis are uniformly associated with autoimmune diseases, mainly in primary vasculitis such as polyarteritis nodosa, Behçet's disease, and Henoch-Schönlein purpura. The overall frequencies of acute orchitis and ASA in rheumatic diseases are 2-31% and 0-50%, respectively. The pathogenesis of primary/secondary autoimmune orchitis is not completely understood but probably involves the access of immune cells to the testicular microenvironment due to inflammation, infection or trauma, leading to apoptosis of spermatocytes and spermatids. Glucocorticoids and immunosuppressive drugs are indicated in autoimmune orchitis-associated active systemic autoimmune diseases. However, there are no standardized treatment options, and the real significance of ASA in infertile men is still controversial. Assisted reproductive technologies such as intrauterine insemination, in vitro fertilization, and intracytoplasmic sperm injection (ICSI) are therapeutic options for male infertility associated with these autoantibodies. ICSI is considered to be the best choice for patients with severe sperm autoimmunity, particularly in males with low semen counts or motility.

  4. What's Your Story?: Dutch Library DOK's New Cutting-Edge Community Tech Projects

    Science.gov (United States)

    Boekesteijn, Erik

    2010-01-01

    DOK, the cutting-edge library center in Delft, the Netherlands, has been finding new ways to elaborate on the social networking impulse. A good library unites people from all levels of society, and DOK's unique innovation department focuses specifically on how media can bring people together. It's doing so using technology to inspire and connect…

  5. Investigation of cutting edge in edge-on silicon microstrip detector

    Energy Technology Data Exchange (ETDEWEB)

    Vrtacnik, D., E-mail: Danilo.Vrtacnik@fe.uni-lj.s [Faculty of Electrical Engineering, University of Ljubljana (Slovenia); Resnik, D.; Mozek, M.; Pecar, B.; Amon, S. [Faculty of Electrical Engineering, University of Ljubljana (Slovenia)

    2010-08-21

    Investigation of cutting edge properties in edge-on silicon microstrip detector has been performed. An advanced approach for reducing dead layer thickness has been introduced. It consists of standard wafer sawing through entire wafer thickness, followed by dry chemical etching and thin layer passivation of the cutting surface. Proposed approach is developed in such a way that no additional photolithographic process steps and critical handling with individual chips are needed after detector fabrication. Results presented in the paper show that this approach results in effective reduction of cutting edge thickness down to 50 {mu}m. Such reduction of dead layer thickness, together with applied efficient current termination technique resulted in substantial improvement of detector structure performance. By described optimization of detector dead layer thickness, detection efficiency has been improved up to 15%.

  6. Transferring Cutting-Edge Research to Museum Learning Environments

    DEFF Research Database (Denmark)

    Achiam, Marianne; Johannsen, Bjørn Friis

    School science differs considerably from the science of scientists. This is because in order to become teachable, science is taken from its original research context, deconstructed and reconstructed, and implemented in schools. While this transition is both necessary and inevitable, it may cause...... school science to become disembodied from its purpose or even obsolete. Accordingly, we suggest that museums are ideal places for the dissemination of cutting-edge science because they are not bound to school syllabi, they have immediate access to contemporary research, and they are already established...... as out-of-school resources. To examine this issue, we carried out a mainly qualitative study of the museum program DNA and Life. The program was intended to engage secondary school students in authentic, cutting-edge research. Through targeted analysis of observations, video recordings, interviews...

  7. Transferring Cutting-Edge Research to Museum Learning Environments

    DEFF Research Database (Denmark)

    Achiam, Marianne; Johannsen, Bjørn Friis

    as out-of-school resources. To examine this issue, we carried out a mainly qualitative study of the museum program DNA and Life. The program was intended to engage secondary school students in authentic, cutting-edge research. Through targeted analysis of observations, video recordings, interviews......School science differs considerably from the science of scientists. This is because in order to become teachable, science is taken from its original research context, deconstructed and reconstructed, and implemented in schools. While this transition is both necessary and inevitable, it may cause...... school science to become disembodied from its purpose or even obsolete. Accordingly, we suggest that museums are ideal places for the dissemination of cutting-edge science because they are not bound to school syllabi, they have immediate access to contemporary research, and they are already established...

  8. On the Cutting Edge: Workshops, Online Resources, and Community Development

    Science.gov (United States)

    Mogk, D. W.; Macdonald, H.; Manduca, C. A.; Tewksbury, B. J.; Fox, S.; Iverson, E. A. R.; Beane, R. J.; Mcconnell, D. A.; Wiese, K.; Wysession, M. E.

    2014-12-01

    On the Cutting Edge, funded by NSF since 2002, offers a comprehensive professional development program for geoscience faculty. The program includes an annual integrated in-person and virtual workshop series, has developed an extensive collection of peer-reviewed instructional activities and related online resources, and supports continuing community development through sponsorship of webinars, listservs, opportunities for community contributions, and dissemination of resources to keep faculty current in their science and pedagogic practices. On the Cutting Edge (CE) has offered more than 100 face-to-face and virtual workshops, webinars, journal clubs, and other events to more than 3000 participants. The award-winning website has more than 5000 pages including 47 modules on career management, pedagogy, and geoscience topics. It has more than 1800 instructional activities contributed by the community, the majority of which have been peer-reviewed. The website had more than one million visitors last year. We have worked to support a community in which faculty improve their teaching by designing courses using research-based methods to foster higher-order thinking, incorporate geoscience data, and address cognitive and affective aspects of learning as well as a community in which faculty are comfortable and successful in managing their careers. The program addresses the needs of faculty in all career stages at the full spectrum of institutions and covering the breadth of the geoscience curriculum. We select timely and compelling topics that attract different groups of participants. CE workshops are interactive, model best pedagogical practices, emphasize participant learning, provide opportunities for participants to share their knowledge and experience, provide high-quality resources, give participants time to reflect and to develop action plans, and help transform their ideas about teaching. On the Cutting Edge has had an impact on teaching based on data from national

  9. Root dentine and endodontic instrumentation: cutting edge microscopic imaging.

    Science.gov (United States)

    Atmeh, Amre R; Watson, Timothy F

    2016-06-06

    Cutting of the dental hard tissues is an integral part of restorative dentistry. Cutting of the root dentine is also needed in preparation prior to endodontic treatment, with significant commercial investment for the development of flexible cutting instruments based around nickel titanium (NiTi) alloys. This paper describes the evolution of endodontic cutting instruments, both in materials used, e.g. the transition from stainless steel to NiTi, and the design of the actual instruments themselves and their method of activation-by hand or motor driven. We have been examining tooth-cutting interactions microscopically for over 25 years using a variety of microscopic techniques; in particular, video-rate confocal microscopy. This has given a unique insight into how many of the procedures that we take for granted are achieved in clinical practice, by showing microscopic video images of the cutting as it occurs within the tooth. This technology has now been extended to allow imaging of the endodontic instrument and the root canal wall for the first time. We are able to image dentine distortion and crack propagation during endodontic filing of the root canal space. We are also able to visualize the often claimed, but seldom seen action of contemporary endodontic instruments.

  10. Internet of Things Part VI:IOT Cutting-edge Technologies and National Projects%物联网概述第6篇:物联网的前沿技术与国家工程建设

    Institute of Scientific and Technical Information of China (English)

    何立民

    2012-01-01

    The era of IOT/Cloud Computing is the time of unmanned universal service.Cutting-edge technologies of IOT include intelligent and universal RFID,smart phone interaction,software integration of expert system and smart grid technology.National projects in time of IOT include building of standard spatial and temporal parameters,electronic securities,infrastructure works and IOT hospitals.%物联网/云计算时代是一个无人化的普适服务时代。物联网的前沿技术,有RFID的智能化与普适化、智能手机的归一化交互、专家系统的软件集成、智能电网的物联技术等等。物联网时代的国家工程建设,有标准时空参数的国家工程建设、有效证券电子化的国家工程建设、重大的民生公共工程建设与物联网医院的示范工程建设等。

  11. Analyses of Effects of Cutting Parameters on Cutting Edge Temperature Using Inverse Heat Conduction Technique

    Directory of Open Access Journals (Sweden)

    Marcelo Ribeiro dos Santos

    2014-01-01

    Full Text Available During machining energy is transformed into heat due to plastic deformation of the workpiece surface and friction between tool and workpiece. High temperatures are generated in the region of the cutting edge, which have a very important influence on wear rate of the cutting tool and on tool life. This work proposes the estimation of heat flux at the chip-tool interface using inverse techniques. Factors which influence the temperature distribution at the AISI M32C high speed steel tool rake face during machining of a ABNT 12L14 steel workpiece were also investigated. The temperature distribution was predicted using finite volume elements. A transient 3D numerical code using irregular and nonstaggered mesh was developed to solve the nonlinear heat diffusion equation. To validate the software, experimental tests were made. The inverse problem was solved using the function specification method. Heat fluxes at the tool-workpiece interface were estimated using inverse problems techniques and experimental temperatures. Tests were performed to study the effect of cutting parameters on cutting edge temperature. The results were compared with those of the tool-work thermocouple technique and a fair agreement was obtained.

  12. Report on the Conference on Transposition and Genome Engineering 2015 (TGE 2015): advancing cutting-edge genomics technology in the ancient city of Nara.

    Science.gov (United States)

    Woltjen, Knut; Yamamoto, Takashi; Kokubu, Chikara; Takeda, Junji

    2016-05-01

    From November 17 to 20 in 2015, the Conference on Transposition and Genome Engineering 2015 (TGE 2015) was held at Nara Kasugano International Forum-IRAKA-in Nara, Japan, located at the center of Nara Park. All of the presentations were carried out at Nohgaku hall in Nara Kasugano International Forum-IRAKA. Participation totaled 148 persons (30 international, 118 domestic), who were able to engage in lively scientific discussions over the 4-day period. The guest speaker list consisted of many top-notch international researchers, an achievement for which the conference received praise from the attendees. There were 36 oral presentations including the keynote lecture (22 presentations from guest speakers, complemented with 14 selected from abstract submissions). Additionally, there were 46 poster presentations. The conference uniquely combined research mainly from two different genomics approaches: (i) transposon technology allowing random genomic integration followed by gene discovery-related phenotypes and (ii) genome editing technology with designer nuclease allowing precise modification of a gene-of-interest.

  13. Based on the Cutting-edge of Energy Technology to Construct a Creative Experimental Teaching System%立足能源科技前沿 构建实验教学创新体系

    Institute of Scientific and Technical Information of China (English)

    方惠英; 邱利民; 陈炯; 胡亚才; 俞自涛

    2011-01-01

    In education practice, the experimental teaching is an import approach to cultivate the creative talents with qualified knowledge and skills. In order to improve the practice ability and innovated spirit for the undergraduate students, the energy and power engineering experimental teaching center of Zhejiang University based on the cutting-edge of energy technology, dedicate all its effort insistently to enrich and modify a new experimental course system leading to inspire the exploration and creation of students. Moreover, a methodology including a series of education disciplines are also presented to support a sustainable development in this academic training.%实验教学是培养高素质创新人才的重要途径。浙江大学能源与动力实验教学中心以培养学生的实践能力和创新精神为中心,立足能源科技前沿,不断丰富和完善开放性创新实验教学课程新体系的内涵,并对今后的持续发展提出了具体思路。

  14. Cutting edge: chemoprevention of colorectal neoplasia in inflammatory bowel disease.

    Science.gov (United States)

    Actis, Giovanni C; Tarallo, Sonia; Rosina, Floriano

    2013-02-01

    Colitis-associated cancer represents a long-standing problem, with two new factors adding to its importance: the diffusion of inflammatory bowel disease in developing countries, and the increased availability of effective drugs that control ulcerative colitis delaying or abrogating the need for a curative colectomy. The consolidated evidence that inflammation is the unique variable that factors in colitic cancer development has conferred impetus to the search and release of anti-inflammatory/immune suppressive molecules to pursue the goal of cancer chemoprevention. Cutting-edge research has provided breakthrough insights into the mechanism of the chemopreventive actions of mesalamines, thiopurines, and probiotics, and we expand on these topics. Despite these advancements, bedside evidence is still mixed and calls for further scrutiny. Nowadays, the clinician must continue to rely on classic preventive measures such as surveillance colonoscopy, and the early and aggressive use of drugs that permit to keep the degree of mucosal inflammation to a minimum.

  15. Cutting Edge RFID Technologies for NASA Applications

    Science.gov (United States)

    Fink, Patrick W.

    2007-01-01

    This viewgraph document reviews the use of Radio-frequency identification (RFID) for NASA applications. Some of the uses reviewed are: inventory management in space; potential RFID uses in a remote human outpost; Ultra-Wideband RFID for tracking; Passive, wireless sensors in NASA applications such as Micrometeoroid impact detection and Sensor measurements in environmental facilities; E-textiles for wireless and RFID.

  16. The Cutting Edge of Affinity Electrophoresis Technology

    Directory of Open Access Journals (Sweden)

    Eiji Kinoshita

    2015-03-01

    Full Text Available Affinity electrophoresis is an important technique that is widely used to separate and analyze biomolecules in the fields of biology and medicine. Both quantitative and qualitative information can be gained through affinity electrophoresis. Affinity electrophoresis can be applied through a variety of strategies, such as mobility shift electrophoresis, charge shift electrophoresis or capillary affinity electrophoresis. These strategies are based on changes in the electrophoretic patterns of biological macromolecules that result from interactions or complex-formation processes that induce changes in the size or total charge of the molecules. Nucleic acid fragments can be characterized through their affinity to other molecules, for example transcriptional factor proteins. Hydrophobic membrane proteins can be identified by means of a shift in the mobility induced by a charged detergent. The various strategies have also been used in the estimation of association/disassociation constants. Some of these strategies have similarities to affinity chromatography, in that they use a probe or ligand immobilized on a supported matrix for electrophoresis. Such methods have recently contributed to profiling of major posttranslational modifications of proteins, such as glycosylation or phosphorylation. Here, we describe advances in analytical techniques involving affinity electrophoresis that have appeared during the last five years.

  17. The Cutting Edge of Affinity Electrophoresis Technology

    Science.gov (United States)

    Kinoshita, Eiji; Kinoshita-Kikuta, Emiko; Koike, Tohru

    2015-01-01

    Affinity electrophoresis is an important technique that is widely used to separate and analyze biomolecules in the fields of biology and medicine. Both quantitative and qualitative information can be gained through affinity electrophoresis. Affinity electrophoresis can be applied through a variety of strategies, such as mobility shift electrophoresis, charge shift electrophoresis or capillary affinity electrophoresis. These strategies are based on changes in the electrophoretic patterns of biological macromolecules that result from interactions or complex-formation processes that induce changes in the size or total charge of the molecules. Nucleic acid fragments can be characterized through their affinity to other molecules, for example transcriptional factor proteins. Hydrophobic membrane proteins can be identified by means of a shift in the mobility induced by a charged detergent. The various strategies have also been used in the estimation of association/disassociation constants. Some of these strategies have similarities to affinity chromatography, in that they use a probe or ligand immobilized on a supported matrix for electrophoresis. Such methods have recently contributed to profiling of major posttranslational modifications of proteins, such as glycosylation or phosphorylation. Here, we describe advances in analytical techniques involving affinity electrophoresis that have appeared during the last five years.

  18. Strength on cut edge and ground edge glass beams with the failure analysis method

    Directory of Open Access Journals (Sweden)

    Stefano Agnetti

    2013-10-01

    Full Text Available The aim of this work is the study of the effect of the finishing of the edge of glass when it has a structural function. Experimental investigations carried out for glass specimens are presented. Various series of annealed glass beam were tested, with cut edge and with ground edge. The glass specimens are tested in four-point bending performing flaw detection on the tested specimens after failure, in order to determine glass strength. As a result, bending strength values are obtained for each specimen. Determining some physical parameter as the depth of the flaw and the mirror radius of the fracture, after the failure of a glass element, it could be possible to calculate the failure strength of that.The experimental results were analyzed with the LEFM theory and the glass strength was analyzed with a statistical study using two-parameter Weibull distribution fitting quite well the failure stress data. The results obtained constitute a validation of the theoretical models and show the influence of the edge processing on the failure strength of the glass. Furthermore, series with different sizes were tested in order to evaluate the size effect.

  19. The Cutting-Edge of Science and Technology Culture and Ethics:A summary of the 12 th National Science and Technology Culture and Social Modernization Symposium%科技文化与科技伦理前沿探究--第十二届全国科技文化与社会现代化学术研讨会综述

    Institute of Scientific and Technical Information of China (English)

    夏劲

    2016-01-01

    第十二届全国科技文化与社会现代化学术研讨会围绕“科技文化与科技伦理”这一主题,考察科技文化在中国的形成及其嬗变;审视高技术前沿的伦理问题;评介国外的技术伦理前沿理论;分析科技文化与其他文化的关系;探讨生态科技文化及其生态文明建设的路径;思考大数据时代我国科技传播文化面临的挑战与对策;提出“两种技术哲学”融合的可能性及进路。%The goal of the 12 th national science and technology culture and social modernization symposium,around the theme of science and technology culture and ethics,is to observe the forming and evolution of science and technolo-gy culture,to examine the ethical issues of cutting-edge high-tech,to appraise the theories of cutting-edge tech-nology ethics from abroad,to analyze the relations between science and technology culture and other cultures,to dis-cuss ecological science and technology culture and its path of structuring it,to ponder the challenges and solutions that our nation is facing in the age of big-data,and to produce the possible approaches and the future direction for the merge of the two philosophies of technology,engineering philosophy of Technology and humanistic philosophy of Technology.

  20. [Modern hearing-aids at the cutting edge of microelectronics. Increased possibilities for individual customization].

    Science.gov (United States)

    Arlinger, S

    1999-08-25

    The development of modern hearing aids has been so great that they now represent the cutting edge of micro-electronics. Flexibility has been enhanced by computer-aided programming of the devices, and particularly by digital signal processing, developments which enable improved customization. Increased knowledge of the pathophysiology of the auditory system, fundamental processes in central auditory pathways, and cognitive function enable technological developments to be exploited, thus enhancing our ability to cope with an increasingly broad spectrum of hearing impairment, ranging from mild high-frequency loss to severe loss across the entire frequency range.

  1. Modelling the cutting edge radius size effect for force prediction in micro milling

    DEFF Research Database (Denmark)

    Bissacco, Giuliano; Hansen, Hans Nørgaard; Jan, Slunsky

    2008-01-01

    This paper presents a theoretical model for cutting force prediction in micro milling, taking into account the cutting edge radius size effect, the tool run out and the deviation of the chip flow angle from the inclination angle. A parameterization according to the uncut chip thickness to cutting...

  2. Edge plasmons and cut-off behavior of graphene nano-ribbon waveguides

    Science.gov (United States)

    Hou, Haowen; Teng, Jinghua; Palacios, Tomás; Chua, Soojin

    2016-07-01

    Graphene nano-ribbon waveguides with ultra-short plasmon wavelength are a promising candidate for nanoscale photonic applications. Graphene edge plasmons are the fundamental and lowest losses mode. Through finite element method, edge plasmons show large effective refractive index and strong field confinement on nanoscale ribbons. The edge plasmons follow a k1/2 dispersion relation. The wavelengths of the edge plasmons and center plasmons differ by a fixed factor. The width of edge plasmon is inversely proportional to wave vector of edge plasmon kedge. Edge defects associate with graphene nano-ribbon induce extra losses and reduce the propagation length. Cut-off width of edge plasmons reduces with increasing frequency. Cut-off width of center plasmon is enlarged by edge component but the enlargement effect diminishing with the increase of kedge. The results are important for the application of graphene plasmon towards ultra-compact photonic devices.

  3. Teaching Introductory Geoscience: A Cutting Edge Workshop Report

    Science.gov (United States)

    Manduca, C.; Tewksbury, B.; Egger, A.; MacDonald, H.; Kirk, K.

    2008-12-01

    Introductory undergraduate courses play a pivotal role in the geosciences. They serve as recruiting grounds for majors and future professionals, provide relevant experiences in geoscience for pre-service teachers, and offer opportunities to influence future policy makers, business people, professionals, and citizens. An introductory course is also typically the only course in geoscience that most of our students will ever take. Because the role of introductory courses is pivotal in geoscience education, a workshop on Teaching Introductory Courses in the 21st Century was held in July 2008 as part of the On the Cutting Edge faculty development program. A website was also developed in conjunction with the workshop. One of the central themes of the workshop was the importance of considering the long-term impact a course should have on students. Ideally, courses can be designed with this impact in mind. Approaches include using the local geology to focus the course and illustrate concepts; designing a course for particular audience (such as Geology for Engineers); creating course features that help students understand and interpret geoscience in the news; and developing capstone projects to teach critical thinking and problem solving skills in a geologic context. Workshop participants also explored strategies for designing engaging activities including exploring with Google Earth, using real-world scenarios, connecting with popular media, or making use of campus features on local field trips. In addition, introductory courses can emphasize broad skills such as teaching the process of science, using quantitative reasoning and developing communication skills. Materials from the workshop as well as descriptions of more than 150 introductory courses and 350 introductory-level activities are available on the website: http://serc.carleton.edu/NAGTWorkshops/intro/index.html.

  4. Cutting edge curve models for equal pitch cutters and their applications

    Institute of Scientific and Technical Information of China (English)

    吕广明; 王洪滨; 唐余勇; 彭龙刚

    2004-01-01

    A mathematic model is established using infinitesimal geometry for the cutting edge design of special milling cutters which use equal lead helix as cutting edges; equations are given for front-end and proclitic surface of revolution of ball pillar milling cutters, ball taper milling cutters and angularly conical milling cutters;and corresponding models are established for the continuity cutting edge curves of milling cutters. Typical examples are given to illustrate the applications of mathematic models, which prove the correctness and applicability of these geometric models.

  5. The Zooniverse: Cutting Edge Scientific Research in the Classroom

    Science.gov (United States)

    Borden, K. A.; Whyte, L. F.; Smith, A.; Tarnoff, A.; Schmitt, H.

    2012-12-01

    Increasingly scientists and researchers from a multitude of disciplines are finding themselves inundated with more data than they could possibly interpret in a lifetime. Computers can be used entirely or partially for some data analysis; but there are some tasks that are currently best suited to human eyes, ears and brains. Zooniverse (www.zooniverse.org) invites members of the public to help researchers analyze and interpret data. To date, hundreds of thousands of volunteers have been involved in classifying images, interpreting sounds and transcribing texts. Zooniverse citizen scientists are providing valuable analyses across a variety of fields, from the hunt for exoplanets in Planet Hunters (planethunters.org) to the transcription of Greek papyri in Ancient Lives (ancientlives.org). Multiple academic publications have resulted from the combined efforts of the Zooniverse community and science teams demonstrating that citizen science is more than ever becoming a well-established method of doing research. Unlike most research projects the data, analysis and interactions with the science teams have an established and visible online presence through the project website and related discussion sites and blogs. These in themselves provide a valuable classroom resource, an opportunity for free and easy access to cutting edge scientific research. Anecdotal evidence exists that teacher can and already do use Zooniverse projects. By providing a rich and varied scaffolding to accompany the Zooniverse projects the opportunity exists for bringing citizen scientists to a wider classroom audience. An audience that may include non-specialist teachers, who require additional support to deliver challenging content, or time strapped educators who haven't the time to develop their own accompanying resources to weave Zooniverse projects into their lessons. During the session we will discuss the recent Zooniverse projects specifically designed to support and promote classroom adoption

  6. Testing of Commercial Cutting Heads for Abrasive Water Jet Technology

    OpenAIRE

    Klich, J. (Jiří); Hlaváček, P.; M. Zeleňák; Sitek, L. (Libor); Foldyna, J. (Josef)

    2013-01-01

    Five different cutting heads designed for cutting by high-speed abrasive water jet technology were tested from cutting ability point of view. Straight kerfs were cut in several metal materials by abrasive water jet. Material removal volume was determined as a measure of performance of specific cutting head. Quality of cutting surface was observed, too. Results are compared and discussed.

  7. THEORETICAL METHOD FOR PREDICTION OF THE CUTTING EDGE RECESSION DURING MILLING WOOD AND SECONDARY WOOD PRODUCTS

    Directory of Open Access Journals (Sweden)

    Bolesław Porankiewicz

    2008-11-01

    Full Text Available A theoretical method for prediction of cutting edge recession during milling wood and wood-based products, due to the presence of hard mineral contamination, High Temperature Tribochemical Reactions (HTTR, and frictional wearing, based on 3D random distribution of contaminant particles is presented and positively verified based on the example of three experiments from the literature, showing good correlation between the predicted and observed cutting edge recession.

  8. Computer Modeling of the Surface Texture Treated by Mill with Curved Cutting Edge

    Directory of Open Access Journals (Sweden)

    M. S. Potapova

    2015-01-01

    Full Text Available Application of mills with a curvilinear profile of the cutting edge (often called rough end mills allows us to increase milling rate, but a roughness of the surface treated by such mills is higher, than after milling by the "ordinary" mills with the "smooth" cutting edge. Deterioration of a roughness is caused by a curvature of cutting edge. The shape and sizes of a profile are of crucial importance for forming roughness on a surface. A literary review revealed that depending on a profile of the cutting edge the roughness of the machined surface makes Ra2…12,5μm.There is a developed parametrical computer model to visualize roughness formed on a surface after milling by the fluting cutter and curved cutting edge mill. The computer model also allows a 3D chip type to be cut off from a work-piece by the mills with various cutting edge profiles. When developing the model it was assumed that the tilt angle of a cutting flute is equal 0 °, a trajectory of the tooth movement is a circle rather than a trochoidal curve.An experimental test of the model has shown that the radial beats of the mill teeth have a very significant effect on the extent of the roughness formed on the machined surface. After amendments - taking into consideration teeth beats - introduced into model the modeling error made less than 5% that can be explained by the fact that profile parameters of the cutting edge of mills embedded in the model are inaccurate because of the tilt angle the cutting flutes.The analysis of the surface model has shown that after milling the work piece has a cellular structure. Each tooth with curved cutting edge forms the cell repeating with the next turn of a mill. The adjacent teeth form identical cells displaced in the feed path with respect to the cell formed by the previous tooth by the chip load Sz. Unlike processing by the ordinary mills with the "smooth" cutting edge in this case on a surface there is a surface texture not only in the feed

  9. WWBT? What Would Ben Think about Killer Apps, Cutting Edges, and Tipping Points in the History of Weather and Climate?

    Science.gov (United States)

    Fleming, J. R.

    2006-12-01

    This paper examines the history of weather and climate since 1706 along three intertwined analytical axes: technology (killer apps), science (cutting edges), and social issues (tipping points). For example, Franklin's best-known killer app, the lightning rod, gains added significance when seen in light of his cutting edge contributions to the science of electricity, his lifelong promotion of useful knowledge, and the societal tipping point his work triggered in our relationship to the sky. Subsequently, other major tipping points and conceptual shifts followed the introduction of telegraphy, radio, television, digital computers, and rocketry into meteorology. Following an analysis of the career and contributions of Benjamin Franklin (1706-1790), the paper examines later historical moments and watersheds, not merely in retrospect, but from the perspective of leading participants at the time. It focuses on technologies of significant promise, especially those involving electro- magnetism, up to and including the dawn of the twenty-first century, and asks playfully, "What would Ben think?"

  10. Cutting (mass) edges at LHC from supersymmetry with leptoquarks

    Energy Technology Data Exchange (ETDEWEB)

    Reuter, J.; Wiesler, D. [Edinburgh Univ. (United Kingdom). School of Physics and Astronomy; Freiburg Univ. (Germany). Physikalisches Institut

    2011-05-15

    Supersymmetric (SUSY) Grand Unified Theories based on exceptional gauge groups like E{sub 6} have recently triggered a lot of interest. Aside from top-down motivations, they contain phenomenologically interesting states with leptoquark quantum numbers. Their SUSY partners, leptoquarkinos, will show up like all R-odd particles in decay cascades, but mass edges in kinematic distributions - originating from the same semi-exclusive final states - will however have major differences to the corresponding edges of ordinary squarks. This bears the opportunity to detect them at LHC, but also to be confused with other new physics models with discrete parities. (orig.)

  11. Conveying Cutting-Edge Discoveries to Nonscientists: Effective Communication with Media

    Science.gov (United States)

    Gupta, Nikhil; Hamilton, Kathleen; Chamot, Joshua

    2013-07-01

    The benefits of using information and news media for disseminating cutting-edge scientific discoveries to the public are well known. Taxpayers and lawmakers need to be informed about the implications of public investments, young students' interest can be molded toward science- and technology-based careers, and public awareness of important issues can be raised by effectively using media. However, communication with news media is different from the means commonly used by scientists—journal publications and conference presentations. This article is intended to provide information on three basic aspects of media interactions—why, what, and how to communicate. The increasing importance of this mode of dissemination in this information age cannot be ignored; rather, it can be effectively utilized for educating a wider population base.

  12. Investigation on the Bearing Abilities of Three-Dimensional Full Five-Directional Braided Composites with Cut-Edge

    Science.gov (United States)

    Wang, Yibo; Liu, Zhenguo; Lei, Bing; Huang, Xiang; Li, Xiaokang

    2016-11-01

    The longitudinal tensile experiments of cut-edge effect on the mechanical performance of three-dimensional full five-directional (3DF5D) braided composites were conducted. The specimens involved two different braiding angles and two different cutting ways. Fracture appearance of specimens without cut-edge and cutting along width direction presented flush, while explosive for specimen with cut-edge along thickness direction. The fracture of axis yarns mainly contributed to the damage of specimens. Cut-edge had little influence on the stiffness of 3DF5D braided composites and had approximately 20 % reduction in tensile strength compared with specimens without cut-edge. The periodic boundary conditions under cut-edge and uncut-edge situations were applied to the RVC to simulate the mesoscopic damage mechanism using finite element method. The stress-strain curves and damage evolution nephogram were obtained. The variation of cut-edge effect with the number of inner cells was predicted by superimposing inner cells method, the addition of inner cells could strengthen the performance of 3DF5D braided composites with cut-edge. These results will play an important role in evaluating the mechanical properties of braided materials after cutting.

  13. A cutting-edge solution for 1µm laser metal processing

    Science.gov (United States)

    Baumbach, N.; Kühl, P.; Karam, J.; Jonkers, J.; Villarreal-Saucedo, F.; Reyes, M.

    2017-02-01

    The recent 1μm-laser cutting market is dominated by fiber and disk lasers due to their excellent beam quality of below 4mm*mrad. Teradiode's 4kW direct diode laser source achieves similar beam quality while having a different beam shape and shorter wavelengths which are known for higher absorption rates at the inclined front of the cutting keyhole. Research projects, such as the HALO Project, have additionally shown that polarized radiation and beams with shapes different from the typical LG00 lead to improved cut quality for ferrous and non-ferrous metals. [1] Diode laser have the inherent property of not being sensitive to back reflection which brings advantages in cutting high-reflective materials. The II-VI HIGHYAG laser cutting head BIMO-FSC offers the unique feature of machine controlled and continuous adjustment of both the focus diameter and the focus position. This feature is proven to be beneficial for cutting and piercing with high speed and small hole diameters. In addition, the optics are designed for lowest focus shift. As a leading laser processing head manufacturer, II-VI HIGHYAG qualified its BIMO-FSC MZ (M=magnification, Z=focus position) cutting head for Teradiode's 4kW direct diode laser source to offer a cutting-edge solution for highpower laser cutting. Combining the magnification ability of the cutting head with this laser source, customers experience strong advantages in cutting metals in broad thickness ranges. Thicknesses up to 25mm mild steel can easily be cut with excellent edge quality. Furthermore, a new optical setup equivalent to an axicon with a variable axicon angle is demonstrated which generates variable sized ring spots. The setup provides new degrees of freedom to tailor the energy distribution for even higher productivity and quality.

  14. Impact of the On the Cutting Edge Professional Development Program on U.S. Geoscience Faculty

    Science.gov (United States)

    Manduca, C. A.; Iverson, E. A.; Czujko, R.; Macdonald, H.; Mogk, D. W.; Tewksbury, B. J.; McLaughlin, J.; Sanford, C.; Greenseid, L.; Luxenberg, M.

    2011-12-01

    Transforming STEM education from a dominantly lecture-based format focused on facts to classrooms where students engage with the process of understanding the world through science is a primary goal of faculty development. On the Cutting Edge seeks to support this transformation by using workshops and a website to build a community of geoscience faculty who learn from one another. In order to assess the impact of the On the Cutting Edge program, we surveyed 5917 U.S. geoscience faculty in 2009 and received 2874 completed responses (49% response rate). We looked at the differences in responses between workshop participants who also use the website, website users who have not attended a Cutting Edge workshop, and survey respondents who had neither attended a Cutting Edge workshop nor used the Cutting Edge website. The number of respondents who had attended a Cutting Edge workshop and had not used the website was too small to analyze. Courses described by Cutting Edge workshop participants make significantly less use of lecture and more use of small group discussion and in-class activities. While all faculty respondents routinely update their courses, workshop participants are more likely to have changed their teaching methods in the two years leading up to the survey. When making changes to their teaching methods, workshop participants are more likely than other populations to seek information about teaching on the web, consult journal articles about teaching, and seek advice from colleagues outside their department and from nationally known leaders in geoscience education. Workshop participants are also more likely to tell a colleague when they do something that is particularly successful in class. End-of-workshop survey and follow-up interview data indicate that participants leave workshops reinvigorated, with a new or renewed commitment to student-centered teaching, and that they make use of the website as they implement ideas for changing their teaching following

  15. A Method and Device for 3D Recognition of Cutting Edge Micro Geometry

    Directory of Open Access Journals (Sweden)

    Bartosz Palubicki

    2014-04-01

    Full Text Available A very useful method was successfully applied in the investigation of tools for machining wood and wood based composites. It allows scanning of the cutting edge micro geometry in three dimensions and reproducing it in a virtual space as a 3D surface. The application of the method opens new possibilities of studying tool wear by scanning, including the calculation of volume loss and other analysis of tool wedge geometry along and perpendicularly to the cutting edge. Effectiveness of the method and scanner were successfully verified by a reference ESEM (Environmental Scanning Electron Microscopy method.

  16. Development of a low-cost measurement system for cutting edge profile detection

    Institute of Scientific and Technical Information of China (English)

    Gregor Gerstorfer; Bernhard G.Zagar

    2011-01-01

    The use of a compact disk(CD) pickup head as a displacement measurement system is described.The components contained in a pickup head are explained and how they are combined to obtain the functionality of a pickup head.The application of measuring a knife edge profile is introduced.The results reveal some insuffiencies with the current system.The cutting edge's radius of curvature can be estimated.

  17. The Cutting Edge: Satellite Chamber, Lasers Spur LC Preservation Effort.

    Science.gov (United States)

    Brandehoff, Susan E.

    1982-01-01

    Describes efforts to preserve important library materials at the Library of Congress through the use of two new technologies: a patented deacidification process in which books are placed in a vacuum chamber, and the use of optical disc recording techniques to miniaturize and store print and nonprint images. (JL)

  18. The Cutting Edge: Satellite Chamber, Lasers Spur LC Preservation Effort.

    Science.gov (United States)

    Brandehoff, Susan E.

    1982-01-01

    Describes efforts to preserve important library materials at the Library of Congress through the use of two new technologies: a patented deacidification process in which books are placed in a vacuum chamber, and the use of optical disc recording techniques to miniaturize and store print and nonprint images. (JL)

  19. Analysis of femtosecond laser assisted capsulotomy cutting edges and manual capsulorhexis using environmental scanning electron microscopy.

    Science.gov (United States)

    Serrao, Sebastiano; Lombardo, Giuseppe; Desiderio, Giovanni; Buratto, Lucio; Schiano-Lomoriello, Domenico; Pileri, Marco; Lombardo, Marco

    2014-01-01

    Purpose. To investigate the structure and irregularity of the capsulotomy cutting edges created by two femtosecond (FS) laser platforms in comparison with manual continuous circular capsulorhexis (CCC) using environmental scanning electron microscopy (eSEM). Methods. Ten anterior capsulotomies were obtained using two different FS laser cataract platforms (LenSx, n = 5, and Victus, n = 5). In addition, five manual CCC (n = 5) were obtained using a rhexis forceps. The specimens were imaged by eSEM (FEI Quanta 400, OR, USA). Objective metrics, which included the arithmetic mean deviation of the surface (Sa) and the root-mean-square deviation of the surface (Sq), were used to evaluate the irregularity of both the FS laser capsulotomies and the manual CCC cutting edges. Results. Several microirregularities were shown across the FS laser capsulotomy cutting edges. The edges of manually torn capsules were shown, by comparison of Sa and Sq values, to be smoother (P laser capsulotomy edges. Conclusions. Work is needed to understand whether the FS laser capsulotomy edge microirregularities, not seen in manual CCC, may act as focal points for the concentration of stress that would increase the risk of capsular tear during phacoemulsification as recently reported in the literature.

  20. Analysis of Femtosecond Laser Assisted Capsulotomy Cutting Edges and Manual Capsulorhexis Using Environmental Scanning Electron Microscopy

    Directory of Open Access Journals (Sweden)

    Sebastiano Serrao

    2014-01-01

    Full Text Available Purpose. To investigate the structure and irregularity of the capsulotomy cutting edges created by two femtosecond (FS laser platforms in comparison with manual continuous circular capsulorhexis (CCC using environmental scanning electron microscopy (eSEM. Methods. Ten anterior capsulotomies were obtained using two different FS laser cataract platforms (LenSx, n=5, and Victus, n=5. In addition, five manual CCC (n=5 were obtained using a rhexis forceps. The specimens were imaged by eSEM (FEI Quanta 400, OR, USA. Objective metrics, which included the arithmetic mean deviation of the surface (Sa and the root-mean-square deviation of the surface (Sq, were used to evaluate the irregularity of both the FS laser capsulotomies and the manual CCC cutting edges. Results. Several microirregularities were shown across the FS laser capsulotomy cutting edges. The edges of manually torn capsules were shown, by comparison of Sa and Sq values, to be smoother (P<0.05 than the FS laser capsulotomy edges. Conclusions. Work is needed to understand whether the FS laser capsulotomy edge microirregularities, not seen in manual CCC, may act as focal points for the concentration of stress that would increase the risk of capsular tear during phacoemulsification as recently reported in the literature.

  1. Diffusivity in multiple sclerosis lesions: At the cutting edge?

    Science.gov (United States)

    Klistorner, Alexander; Wang, Chenyu; Fofanova, Vera; Barnett, Michael H; Yiannikas, Con; Parratt, John; You, Yuyi; Graham, Stuart L

    2016-01-01

    Radial Diffusivity (RD) has been suggested as a promising biomarker associated with the level of myelination in MS lesions. However, the level of RD within the lesion is affected not only by loss of myelin sheaths, but also by the degree of tissue destruction. This may lead to exaggeration of diffusivity measures, potentially masking the effect of remyelination. To test the hypothesis that the T2 hyperintense lesion edge that extends beyond the T1 hypointense lesion core is less affected by tissue loss, and therefore a more appropriate target for imaging biomarker development targeting de- and re-myelination. Pre- and post-gadolinium (Gd) enhanced T1, T2 and DTI images were acquired from 75 consecutive RRMS patients. The optic radiation (OR) was identified in individual patients using a template-based method. T2 lesions were segmented into T1-hypointense and T1-isointense areas and lesion masks intersected with the OR. Average Radial, Axial and Mean diffusivity (RD, AD and MD) and fractional anisotropy (FA) were calculated for lesions of the entire brain and the OR. In addition, Gd enhancing lesions were excluded from the analysis. 86% of chronic T2 lesions demonstrated hypointense areas on T1-weighted images, which typically occupied the central part of each T2 lesion, taking about 40% of lesional volume. The T1-isointense component of the T2 lesion was most commonly seen as a peripheral ring of relatively constant thickness ("T2-rim"). While changes of diffusivity between adjacent normal appearing white matter and the "T2-rim" demonstrated a disproportionally high elevation of RD compare to AD, the increase of water diffusion was largely isointense between the "T2-rim" and T1-hypointense parts of the lesion. Distinct patterns of diffusivity within the central and peripheral components of MS lesions suggest that axonal loss dominates in the T1 hypointense core. The effects of de/remyelination may be more readily detected in the "T2-rim", where there is relative

  2. Effects of knife edge angle and speed on peak force and specific energy when cutting vegetables of diverse texture

    Directory of Open Access Journals (Sweden)

    Vishal Singh

    2016-04-01

    Full Text Available Cutting tool parameters such as edge-sharpness and speed of cut directly influence the shape of final samples and the required cutting force and specific energy for slicing or cutting operations. Cutting force and specific energy studies on different vegetables help to design the appropriate slicing or cutting devices. Peak cutting force and specific energy requirements for the transverse cutting of nine vegetables, differing in their textural characteristics of rind and flesh, were determined at cutting speeds of 20, 30, 40 mm min-1 and single-cut knife-edge angles of 15, 20 and 25° using a Universal Testing Machine. Low speed (20 mm min-1 cutting with a sharper knife-edge angle (15° required less peak force and specific energy than that of high-speed cutting (40 mm min-1 with a wider knife-edge angle (25°. The vegetables with the maximum and minimum variation in the average peak cutting force were aubergine, at 79.05 (for knife speed 20 mm min-1 and edge angle 150 to 285.1 N (40 mm min-1 and 250, and cucumber, at 11.61 (20 mm min-1 and 150 to 21.41 N (40 mm min-1 and 250, respectively. High speed (40 mm min-1, with a large knife-edge angle (25°, required the highest force and specific energy to cut the vegetables, however, low speed (20 mm min-1, with a small knife-edge angle (150, is preferred. Effects of cutting speed and knife-edge angle on peak force and specific energy responses were found significant (p<0.05. Linear or quadratic regressions gave a good fit of these variables. 

  3. The Snowmastodon Project: cutting-edge science on the blade of a bulldozer

    Science.gov (United States)

    Pigati, Jeffery S.; Miller, Ian M.; Johnson, Kirk R.

    2015-01-01

    Cutting-edge science happens at a variety of scales, from the individual and intimate to the large-scale and collaborative. The publication of a special issue of Quaternary Research in Nov. 2014 dedicated to the scientific findings of the “Snowmastodon Project” highlights what can be done when natural history museums, governmental agencies, and academic institutions work toward a common goal.

  4. Pupillometry: Cutting Edge Biometrics for Early Intervention in Increased Intracranial Pressure.

    Science.gov (United States)

    John, Jennilee St

    2015-10-01

    The pupillometer, a cutting-edge biometric device, is a valuable assessment tool that can aid in the early detection and prompt treatment of neurological abnormalities. Pupil assessment is a critical component of the neurological examination, and manual pupil assessment leaves much room for error. Automated pupillometry improves the quality and reliability of pupillary and neurological assessments, ultimately improving patient outcomes.

  5. Bearing Abilities and Progressive Damage Analysis of Three Dimensional Four-Directional Braided Composites with Cut-Edge

    Science.gov (United States)

    Lei, Bing; Liu, Zhenguo; Ya, Jixuan; Wang, Yibo; Li, Xiaokang

    2016-08-01

    Cut-edge is a kind of damage for the three-dimensional four-directional (3D4d) braided composites which is inevitable because of machining to meet requisite shape and working in the abominable environment. The longitudinal tensile experiment of the 3D4d braided composites with different braiding angles between cut-edge and the ones without cut-edge was conducted. Then representative volume cell (RVC) with interface zones was established to analyze the tensile properties through the fracture and damage mechanics. The periodic boundary conditions under the cut-edge and uncut-edge conditions were imposed to simulate the failure mechanism. Stress-strain distribution and the damage evolution nephogram in cut-edge condition were conducted. Numerical results were coincident with the experimental results. Finally the variation of cut-edge effect with the specimen thickness was simulated by superimposing inner cells. The consequence showed that thickness increase can effectively reduce cut-edge influence on longitudinal strength for 3D4d braided composites. Cut-edge simulation of braided composites has guiding significance on the actual engineering application.

  6. Kinect, a Novel Cutting Edge Tool in Pavement Data Collection

    Science.gov (United States)

    Mahmoudzadeh, A.; Firoozi Yeganeh, S.; Golroo, A.

    2015-12-01

    Pavement roughness and surface distress detection is of interest of decision makers due to vehicle safety, user satisfaction, and cost saving. Data collection, as a core of pavement management systems, is required for these detections. There are two major types of data collection: traditional/manual data collection and automated/semi-automated data collection. This paper study different non-destructive tools in detecting cracks and potholes. For this purpose, automated data collection tools, which have been utilized recently are discussed and their applications are criticized. The main issue is the significant amount of money as a capital investment needed to buy the vehicle. The main scope of this paper is to study the approach and related tools that not only are cost-effective but also precise and accurate. The new sensor called Kinect has all of these specifications. It can capture both RGB images and depth which are of significant use in measuring cracks and potholes. This sensor is able to take image of surfaces with adequate resolution to detect cracks along with measurement of distance between sensor and obstacles in front of it which results in depth of defects. This technology has been very recently studied by few researchers in different fields of studies such as project management, biomedical engineering, etc. Pavement management has not paid enough attention to use of Kinect in monitoring and detecting distresses. This paper is aimed at providing a thorough literature review on usage of Kinect in pavement management and finally proposing the best approach which is cost-effective and precise.

  7. Cutting-Edge: Integrating Students with Intellectual and Developmental Disabilities into a 4-Year Liberal Arts College

    Science.gov (United States)

    Hafner, Dedra; Moffatt, Courtney; Kisa, Nutullah

    2011-01-01

    Cutting-Edge provides inclusion in college for students with intellectual disabilities (SWID). Cutting-Edge students attended college by taking undergraduate courses, resided in student housing, and engaged in student-life events as well as pursued community service, internships and employment. Undergraduate students were the best means to teach…

  8. Use of Cutting-Edge Horizontal and Underbalanced Drilling Technologies and Subsurface Seismic Techniques to Explore, Drill and Produce Reservoired Oil and Gas from the Fractured Monterey Below 10,000 ft in the Santa Maria Basin of California

    Energy Technology Data Exchange (ETDEWEB)

    George Witter; Robert Knoll; William Rehm; Thomas Williams

    2005-09-29

    This project was undertaken to demonstrate that oil and gas can be drilled and produced safely and economically from a fractured Monterey reservoir in the Santa Maria Basin of California by employing horizontal wellbores and underbalanced drilling technologies. Two vertical wells were previously drilled in this area with heavy mud and conventional completions; neither was commercially productive. A new well was drilled by the project team in 2004 with the objective of accessing an extended length of oil-bearing, high-resistivity Monterey shale via a horizontal wellbore, while implementing managed-pressure drilling (MPD) techniques to avoid formation damage. Initial project meetings were conducted in October 2003. The team confirmed that the demonstration well would be completed open-hole to minimize productivity impairment. Following an overview of the geologic setting and local field experience, critical aspects of the application were identified. At the pre-spud meeting in January 2004, the final well design was confirmed and the well programming/service company requirements assigned. Various design elements were reduced in scope due to significant budgetary constraints. Major alterations to the original plan included: (1) a VSP seismic survey was delayed to a later phase; (2) a new (larger) surface hole would be drilled rather than re-enter an existing well; (3) a 7-in. liner would be placed into the top of the Monterey target as quickly as possible to avoid problems with hole stability; (4) evaluation activities were reduced in scope; (5) geosteering observations for fracture access would be deduced from penetration rate, cuttings description and hydrocarbon in-flow; and (6) rather than use nitrogen, a novel air-injection MPD system was to be implemented. Drilling operations, delayed from the original schedule by capital constraints and lack of rig availability, were conducted from September 12 to November 11, 2004. The vertical and upper curved sections were

  9. Use of Cutting-Edge Horizontal and Underbalanced Drilling Technologies and Subsurface Seismic Techniques to Explore, Drill and Produce Reservoired Oil and Gas from the Fractured Monterey Below 10,000 ft in the Santa Maria Basin of California

    Energy Technology Data Exchange (ETDEWEB)

    George Witter; Robert Knoll; William Rehm; Thomas Williams

    2006-06-30

    This project was undertaken to demonstrate that oil and gas can be drilled and produced safely and economically from a fractured Monterey reservoir in the Santa Maria Basin of California by employing horizontal wellbores and underbalanced drilling technologies. Two vertical wells were previously drilled in this area with heavy mud and conventional completions; neither was commercially productive. A new well was drilled by the project team in 2004 with the objective of accessing an extended length of oil-bearing, high-resistivity Monterey shale via a horizontal wellbore, while implementing managed-pressure drilling (MPD) techniques to avoid formation damage. Initial project meetings were conducted in October 2003. The team confirmed that the demonstration well would be completed open-hole to minimize productivity impairment. Following an overview of the geologic setting and local field experience, critical aspects of the application were identified. At the pre-spud meeting in January 2004, the final well design was confirmed and the well programming/service company requirements assigned. Various design elements were reduced in scope due to significant budgetary constraints. Major alterations to the original plan included: (1) a VSP seismic survey was delayed to a later phase; (2) a new (larger) surface hole would be drilled rather than re-enter an existing well; (3) a 7-in. liner would be placed into the top of the Monterey target as quickly as possible to avoid problems with hole stability; (4) evaluation activities were reduced in scope; (5) geosteering observations for fracture access would be deduced from penetration rate, cuttings description and hydrocarbon in-flow; and (6) rather than use nitrogen, a novel air-injection MPD system was to be implemented. Drilling operations, delayed from the original schedule by capital constraints and lack of rig availability, were conducted from September 12 to November 11, 2004. The vertical and upper curved sections were

  10. Use of Cutting-Edge Horizontal and Underbalanced Drilling Technologies and Subsurface Seismic Techniques to Explore, Drill and Produce Reservoired Oil and Gas from the Fractured Monterey Below 10,000 ft in the Santa Maria Basin of California

    Energy Technology Data Exchange (ETDEWEB)

    George Witter; Robert Knoll; William Rehm; Thomas Williams

    2005-09-29

    This project was undertaken to demonstrate that oil and gas can be drilled and produced safely and economically from a fractured Monterey reservoir in the Santa Maria Basin of California by employing horizontal wellbores and underbalanced drilling technologies. Two vertical wells were previously drilled in this area with heavy mud and conventional completions; neither was commercially productive. A new well was drilled by the project team in 2004 with the objective of accessing an extended length of oil-bearing, high-resistivity Monterey shale via a horizontal wellbore, while implementing managed-pressure drilling (MPD) techniques to avoid formation damage. Initial project meetings were conducted in October 2003. The team confirmed that the demonstration well would be completed open-hole to minimize productivity impairment. Following an overview of the geologic setting and local field experience, critical aspects of the application were identified. At the pre-spud meeting in January 2004, the final well design was confirmed and the well programming/service company requirements assigned. Various design elements were reduced in scope due to significant budgetary constraints. Major alterations to the original plan included: (1) a VSP seismic survey was delayed to a later phase; (2) a new (larger) surface hole would be drilled rather than re-enter an existing well; (3) a 7-in. liner would be placed into the top of the Monterey target as quickly as possible to avoid problems with hole stability; (4) evaluation activities were reduced in scope; (5) geosteering observations for fracture access would be deduced from penetration rate, cuttings description and hydrocarbon in-flow; and (6) rather than use nitrogen, a novel air-injection MPD system was to be implemented. Drilling operations, delayed from the original schedule by capital constraints and lack of rig availability, were conducted from September 12 to November 11, 2004. The vertical and upper curved sections were

  11. USE OF CUTTING-EDGE HORIZONTAL AND UNDERBALANCED DRILLING TECHNOLOGIES AND SUBSURFACE SEISMIC TECHNIQUES TO EXPLORE, DRILL AND PRODUCE RESERVOIRED OIL AND GAS FROM THE FRACTURED MONTEREY BELOW 10,000 FT IN THE SANTA MARIA BASIN OF CALIFORNIA

    Energy Technology Data Exchange (ETDEWEB)

    George Witter; Robert Knoll; William Rehm; Thomas Williams

    2005-02-01

    This project was undertaken to demonstrate that oil and gas can be drilled and produced safely and economically from a fractured Monterey reservoir in the Santa Maria Basin of California by employing horizontal wellbores and underbalanced drilling technologies. Two vertical wells were previously drilled in this area by Temblor Petroleum with heavy mud and conventional completions; neither was commercially productive. A new well was drilled by the project team in 2004 with the objective of accessing an extended length of oil-bearing, high-resistivity Monterey shale via a horizontal wellbore, while implementing managed-pressure drilling (MPD) techniques to avoid formation damage. Initial project meetings were conducted in October 2003. The team confirmed that the demonstration well would be completed open-hole to minimize productivity impairment. Following an overview of the geologic setting and local field experience, critical aspects of the application were identified. At the pre-spud meeting in January 2004, the final well design was confirmed and the well programming/service company requirements assigned. Various design elements were reduced in scope due to significant budgetary constraints. Major alterations to the original plan included: (1) a VSP seismic survey was delayed to a later phase; (2) a new (larger) surface hole would be drilled rather than re-enter an existing well; (3) a 7-in. liner would be placed into the top of the Monterey target as quickly as possible to avoid problems with hole stability; (4) evaluation activities were reduced in scope; (5) geosteering observations for fracture access would be deduced from penetration rate, cuttings description and hydrocarbon in-flow; and (6) rather than use nitrogen, a novel air-injection MPD system was to be implemented. Drilling operations, delayed from the original schedule by capital constraints and lack of rig availability, were conducted from September 12 to November 11, 2004. The vertical and upper

  12. USE OF CUTTING-EDGE HORIZONTAL AND UNDERBALANCED DRILLING TECHNOLOGIES AND SUBSURFACE SEISMIC TECHNIQUES TO EXPLORE, DRILL AND PRODUCE RESERVOIRED OIL AND GAS FROM THE FRACTURED MONTEREY BELOW 10,000 FT IN THE SANTA MARIA BASIN OF CALIFORNIA

    Energy Technology Data Exchange (ETDEWEB)

    George Witter; Robert Knoll; William Rehm; Thomas Williams

    2005-02-01

    This project was undertaken to demonstrate that oil and gas can be drilled and produced safely and economically from a fractured Monterey reservoir in the Santa Maria Basin of California by employing horizontal wellbores and underbalanced drilling technologies. Two vertical wells were previously drilled in this area by Temblor Petroleum with heavy mud and conventional completions; neither was commercially productive. A new well was drilled by the project team in 2004 with the objective of accessing an extended length of oil-bearing, high-resistivity Monterey shale via a horizontal wellbore, while implementing managed-pressure drilling (MPD) techniques to avoid formation damage. Initial project meetings were conducted in October 2003. The team confirmed that the demonstration well would be completed open-hole to minimize productivity impairment. Following an overview of the geologic setting and local field experience, critical aspects of the application were identified. At the pre-spud meeting in January 2004, the final well design was confirmed and the well programming/service company requirements assigned. Various design elements were reduced in scope due to significant budgetary constraints. Major alterations to the original plan included: (1) a VSP seismic survey was delayed to a later phase; (2) a new (larger) surface hole would be drilled rather than re-enter an existing well; (3) a 7-in. liner would be placed into the top of the Monterey target as quickly as possible to avoid problems with hole stability; (4) evaluation activities were reduced in scope; (5) geosteering observations for fracture access would be deduced from penetration rate, cuttings description and hydrocarbon in-flow; and (6) rather than use nitrogen, a novel air-injection MPD system was to be implemented. Drilling operations, delayed from the original schedule by capital constraints and lack of rig availability, were conducted from September 12 to November 11, 2004. The vertical and upper

  13. A Cutting-Edge Education: Incorporating Nano into the Undergraduate Curricula.

    Science.gov (United States)

    Zenner, Greta M.

    2008-03-01

    The Interdisciplinary Education Group (IEG) of the Materials Research Science and Engineering Center (MRSEC) on Nanostructured Interfaces at the University of Wisconsin-Madison (UW) develops and uses hands-on, interactive education and outreach materials to engage a variety of audiences in learning about nanotechnology and advanced materials. Many of the education products created are inspired by UW MRSEC research; and faculty, staff, and students regularly contribute to the IEG's work to share nanotechnology with a broader audience. The UW MRSEC has developed numerous teaching modules, labs, and education resources devoted to nanotechnology concepts, and many of these materials have been integrated into key introductory and advanced undergraduate courses at UW and other institutions, including small liberal arts colleges and community colleges. This effort has taken place through both the creation of new courses and the modification of existing courses to include cutting-edge content based on current research and emerging applications in nanotechnology. In this talk, I will present some of the new instructional materials we have developed based on advances in nanoscale science and technology, the implementation and integration of these materials into undergraduate curricula, and an overview of the UW MRSEC education efforts.

  14. Cutting Edge

    DEFF Research Database (Denmark)

    Hansen, Camilla H F; Yurkovetskiy, Leonid A; Chervonsky, Alexander V

    2016-01-01

    Polyglandular autoimmune inflammation accompanies type 1 diabetes (T1D) in NOD mice, affecting organs like thyroid and salivary glands. Although commensals are not required for T1D progression, germ-free (GF) mice had a very low degree of sialitis, which was restored by colonization with select...

  15. Gradient cuts and extremal edges in relative depth and figure-ground perception.

    Science.gov (United States)

    Ghose, Tandra; Palmer, Stephen E

    2016-02-01

    Extremal edges (EEs) are borders consisting of luminance gradients along the projected edge of a partly self-occluding curved surface (e.g., a cylinder), with equiluminant contours (ELCs) that run approximately parallel to that edge. Gradient cuts (GCs) are similar luminance gradients with ELCs that intersect (are "cut" by) an edge that could be due to occlusion. EEs are strongly biased toward being seen as closer/figural surfaces (Palmer & Ghose, Psychological Science, 19(1), 77-83, 2008). Do GCs produce a complementary bias toward being seen as ground? Experiment 1 shows that, with EEs on the opposite side, GCs produce a ground bias that increases with increasing ELC angles between ELCs and the shared edge. Experiment 2 shows that, with flat surfaces on the opposite side, GCs do not produce a ground bias, suggesting that more than one factor may be operating. We suggest that two partially dissociable factors may operate for curved surfaces-ELC angle and 3-D surface convexity-that reinforce each other in the figural cues of EEs but compete with each other in GCs. Moreover, this figural bias is modulated by the presence of EEs and GCs, as specified by the ELC angle between ELCs and the shared contour.

  16. Cutting Edge Research in Homeopathy: HRI's second international research conference in Rome.

    Science.gov (United States)

    Tournier, Alexander L; Roberts, E Rachel

    2016-02-01

    Rome, 3rd-5th June 2015, was the setting for the Homeopathy Research Institute's (HRI) second conference with the theme 'Cutting Edge Research in Homeopathy'. Attended by over 250 delegates from 39 countries, this event provided an intense two and a half day programme of presentations and a forum for the sharing of ideas and the creation of international scientific collaborations. With 35 oral presentations from leaders in the field, the scientific calibre of the programme was high and the content diverse. This report summarises the key themes underpinning the cutting edge data presented by the speakers, including six key-note presentations, covering advancements in both basic and clinical research. Given the clear commitment of the global homeopathic community to high quality research, the resounding success of both Barcelona 2013 and Rome 2015 HRI conferences, and the dedicated support of colleagues, the HRI moves confidently forward towards the next biennial conference.

  17. JPN Guidelines for the management of acute pancreatitis: cutting-edge information

    OpenAIRE

    Takada, Tadahiro; Kawarada, Yoshifumi; Hirata, Koichi; Mayumi, Toshihiko; Yoshida, Masahiro; Sekimoto, Miho; Hirota, Masahiko; Kimura, Yasutoshi; Takeda, Kazunori; Isaji, Shuji; Koizumi, Masaru; Otsuki, Makoto; Matsuno, Seiki

    2006-01-01

    The JPN Guidelines for the Management of Acute Pancreatitis are organized under the subject headings: epidemiology, diagnosis, management strategy, severity assessment and transfer criteria, management of gallstone pancreatitis, nonsurgical management, and surgical management. The Guidelines contain cutting-edge information on each of these subjects, as well as a section on the Japanese medical insurance system which provides information that should prove useful to physicians in other countri...

  18. Enameloid microstructure of the serrated cutting edges in certain fossil carcharhiniform and lamniform sharks.

    Science.gov (United States)

    Andreev, Plamen S

    2010-07-01

    The triple-layered enameloid organization of neoselachian teeth has proven to be a reliable systematic character of the group. This study uses scanning electron microscopy to investigate the orientation of the parallel enameloid bundles in the area of the serrated cutting edges in certain fossil elasmobranchs. The examined teeth come from two Upper Cretaceous Squalicorax species and the Upper Miocene carcharhiniforms Galeocerdo sp., Carcharhinus sp., and Hemipristis serra. The parallel bundles are revealed by surface etching, which removes the superficial shiny-layered enameloid. In the teeth of Squalicorax, the bundles around the cutting edge bend once, before they reach the serrations. The studied carcharhiniform species show a more complicated pattern with a change of parallel bundle course inside the serrations. H. serra teeth do not display the first bending of the bundles, whereas it was present in the other two carcharhiniforms. The course of the crystalline bundles in both Squalicorax species is not affected by the presence of the serrations, regardless of the twofold difference in tooth size between them. In the carcharhiniform species, the bended bundles occur within the primary and secondary serrations and are always associated with them. This feature might have functional significance by strengthening the cutting edge or could simply develop as a consequence of the enameloid mineralization around the individual serrae.

  19. Technological study of oxygen aided laser cutting silicon steel

    Science.gov (United States)

    Hong, Lei; Mi, Chenglong; Wu, Gang

    2008-03-01

    It is easy to produce molten dross by using traditional laser cutting technology in laser cutting silicon steel sheet. The main reason is that oxidizing reaction will take place inevitably by using oxygen as aided gas, so high pressure and high purity N II or inert gases is used as aided cutting gas in laser cutting process. Although the cut quality is improved, the cutting efficiency is dropped because of the lack of energy resulting from an exothermic oxidation reaction. A fire new laser cutting technology by using an additional nozzle put under the workpiece that will form lateral gas flow to control the direction of the flowing dross gas is raised. In this technology oxygen is still used as aided gas, the laser power is reduced and the cut is fine. The experiments prove that by controlling the technical parameter reasonably, glossy and dross-free cutting kerfs are obtained. The gas flow acting under the workpiece is simulated by Finite Element Method (FEM). The varieties of pneumatic fields when the additional nozzle is in different degree and flow velocity are analyzed, which provides academic basis for controlling the flowing direction of the dross gas more reasonably. This laser cutting technology is practical and feasible.

  20. Effect of cutting edge radius on surface roughness in diamond tool turning of transparent MgAl2O4 spinel ceramic

    Science.gov (United States)

    Yue, Xiaobin; Xu, Min; Du, Wenhao; Chu, Chong

    2017-09-01

    Transparent magnesium aluminate spinel (MgAl2O4) ceramic is one of an important optical materials. However, due to its pronounced hardness and brittleness, the optical machining of this material is very difficult. Diamond turning has advantages over the grinding process in flexibility and material removal rate. However, there is a lack of research that could support the use of diamond turning technology in the machining of MgAl2O4 spinel ceramic. Using brittle-ductile transition theory of brittle material machining, this work provides critical information that may help to realize ductile-regime turning of MgAl2O4 spinel ceramic. A characterization method of determination the cutting edge radius is introduced here. Suitable diamond tools were measured for sharpness and then chosen from a large number of candidate tools. The influence of rounded cutting edges on surface roughness of the MgAl2O4 spinel ceramic is also investigated. These results indicate that surface quality of MgAl2O4 spinel is relate to the radius of diamond tool's cutting edge, cutting speed, and feed rate. Sharp diamond tools (small radius of cutting edge) facilitated ductile-regime turning of MgAl2O4 spinel and shows great potential to reduce surface roughness and produce smoother final surface.

  1. Positive edge effects on forest-interior cryptogams in clear-cuts.

    Directory of Open Access Journals (Sweden)

    Alexandro Caruso

    Full Text Available Biological edge effects are often assessed in high quality focal habitats that are negatively influenced by human-modified low quality matrix habitats. A deeper understanding of the possibilities for positive edge effects in matrix habitats bordering focal habitats (e.g. spillover effects is, however, essential for enhancing landscape-level resilience to human alterations. We surveyed epixylic (dead wood inhabiting forest-interior cryptogams (lichens, bryophytes, and fungi associated with mature old-growth forests in 30 young managed Swedish boreal forest stands bordering a mature forest of high conservation value. In each young stand we registered species occurrences on coarse dead wood in transects 0-50 m from the border between stand types. We quantified the effect of distance from the mature forest on the occurrence of forest-interior species in the young stands, while accounting for local environment and propagule sources. For comparison we also surveyed epixylic open-habitat (associated with open forests and generalist cryptogams. Species composition of epixylic cryptogams in young stands differed with distance from the mature forest: the frequency of occurrence of forest-interior species decreased with increasing distance whereas it increased for open-habitat species. Generalists were unaffected by distance. Epixylic, boreal forest-interior cryptogams do occur in matrix habitats such as clear-cuts. In addition, they are associated with the matrix edge because of a favourable microclimate closer to the mature forest on southern matrix edges. Retention and creation of dead wood in clear-cuts along the edges to focal habitats is a feasible way to enhance the long-term persistence of epixylic habitat specialists in fragmented landscapes. The proposed management measures should be performed in the whole stand as it matures, since microclimatic edge effects diminish as the matrix habitat matures. We argue that management that aims to increase

  2. Positive edge effects on forest-interior cryptogams in clear-cuts.

    Science.gov (United States)

    Caruso, Alexandro; Rudolphi, Jörgen; Rydin, Håkan

    2011-01-01

    Biological edge effects are often assessed in high quality focal habitats that are negatively influenced by human-modified low quality matrix habitats. A deeper understanding of the possibilities for positive edge effects in matrix habitats bordering focal habitats (e.g. spillover effects) is, however, essential for enhancing landscape-level resilience to human alterations. We surveyed epixylic (dead wood inhabiting) forest-interior cryptogams (lichens, bryophytes, and fungi) associated with mature old-growth forests in 30 young managed Swedish boreal forest stands bordering a mature forest of high conservation value. In each young stand we registered species occurrences on coarse dead wood in transects 0-50 m from the border between stand types. We quantified the effect of distance from the mature forest on the occurrence of forest-interior species in the young stands, while accounting for local environment and propagule sources. For comparison we also surveyed epixylic open-habitat (associated with open forests) and generalist cryptogams. Species composition of epixylic cryptogams in young stands differed with distance from the mature forest: the frequency of occurrence of forest-interior species decreased with increasing distance whereas it increased for open-habitat species. Generalists were unaffected by distance. Epixylic, boreal forest-interior cryptogams do occur in matrix habitats such as clear-cuts. In addition, they are associated with the matrix edge because of a favourable microclimate closer to the mature forest on southern matrix edges. Retention and creation of dead wood in clear-cuts along the edges to focal habitats is a feasible way to enhance the long-term persistence of epixylic habitat specialists in fragmented landscapes. The proposed management measures should be performed in the whole stand as it matures, since microclimatic edge effects diminish as the matrix habitat matures. We argue that management that aims to increase habitat quality

  3. Study on precision cutting technology of complex shape microparts

    Institute of Scientific and Technical Information of China (English)

    2007-01-01

    Relatively to non-traditional and high-energy-beam micro-manufacturing technique, the micro-cutting technology has many merits. For instance, the machining range is bigger, the cost of equipments is much lower, and the productivity and machining accuracy are higher. Therefore, the micro-cutting technology will take an important effect on the machining technique of complex shape microparts. In this paper, based on selfly-developed machine tool, the precision cutting technology of complex shape microparts made of metal material was studied by analyzing the modeling method on complex shape, the means of toolpaths layout and the optimal selection for cutting parameters. On the basis of above work, a typical duralumin specimen of high precision, low surface roughness and complex shape micropart was manufactured. This result will provide favorable technical support for farther research on the micro-cutting technology.

  4. Plasma arc cutting technology: simulation and experiments

    Energy Technology Data Exchange (ETDEWEB)

    Cantoro, G; Colombo, V; Concetti, A; Ghedini, E; Sanibondi, P; Zinzani, F; Rotundo, F [Department of Mechanical Engineering (D.I.E.M.) and Research Center for Applied Mathematics (C.I.R.A.M.), Alma Mater Studiorum-Universita di Bologna, Via Saragozza 8, 40123 Bologna (Italy); Dallavalle, S; Vancini, M, E-mail: emanuele.ghedini@unibo.it [Cebora S.p.A., Via Andrea Costa 24, 40057 Cadriano di Granarolo (Italy)

    2011-01-01

    Transferred arc plasma torches are widely used in industrial processes for cutting of metallic materials because of their ability to cut a wide range of metals with very high productivity. The process is characterized by a transferred electric arc established between an electrode inside the torch (the cathode) and another electrode, the metallic workpiece to be cut (the anode). In order to obtain a high quality cut and a high productivity, the plasma jet must be as collimated as possible and must have the higher achievable power density. Plasma modelling and numerical simulation can be very useful tools for the designing and optimizing these devices, but research is still in the making for finding a link between simulation of the plasma arc and a consistent prevision of cut quality. Numerical modelling of the behaviour of different types of transferred arc dual gas plasma torches can give an insight on the physical reasons for the industrial success of various design and process solutions that have appeared over the last years. Diagnostics based on high speed imaging and Schlieren photography can play an important role for investigating piercing, dross generation, pilot arcing and anode attachment location. Also, the behaviour of hafnium cathodes at high current levels at the beginning of their service life can been experimentally investigated, with the final aim of understanding the phenomena that take place during those initial piercing and cutting phases and optimizing the initial shape of the surface of the emissive insert exposed to plasma atmosphere.

  5. Laser cutting, State of the art and technological trends

    DEFF Research Database (Denmark)

    Olsen, Flemming Ove

    1999-01-01

    In this paper a short review of the development trends in laser cutting will be given. The technoloty which is the fastest expanding industrial production technology will develop in both its core market segment: Flat bed cutting of sheet metal as it will expand in heavy industry and in cutting of......-dimensional shapes. The CO2 laser will also in the near futre be the domination laser source in the market, although the new developments in ND-YAG-lasers opens for new possibilities for this laser type.......In this paper a short review of the development trends in laser cutting will be given. The technoloty which is the fastest expanding industrial production technology will develop in both its core market segment: Flat bed cutting of sheet metal as it will expand in heavy industry and in cutting of 3...

  6. Distribution of contact loads over the flank-land of the cutter with a rounded cutting edge

    Science.gov (United States)

    Kozlov, V.; Gerasimov, A.; Kim, A.

    2016-04-01

    In this paper, contact conditions between a tool and a workpiece material for wear-simulating turning by a cutter with a sharp-cornered edge and with a rounded cutting edge are analysed. The results of the experimental study of specific contact load distribution over the artificial flank wear-land of the cutter in free orthogonal turning of the disk from titanium alloy (Ti6Al2Mo2Cr), ductile (63Cu) and brittle (57Cu1Al3Mn) brasses are described. Investigations were carried out by the method of ‘split cutter’ and by the method of the artificial flank-land of variable width. The experiments with a variable feed rate and a cutting speed show that in titanium alloy machining with a sharp-cornered cutting edge the highest normal contact load (σh max = 3400…2200 MPa) is observed immediately at the cutting edge, and the curve has a horizontal region with the length of 0.2… 0.6 mm. At a distance from the cutting edge, the value of specific normal contact load is dramatically reduced to 1100…500 MPa. The character of normal contact load for a rounded cutting edge is different -it is uniform, and its value is approximately 2 times smaller compared to machining with a sharp-cornered cutting edge. In author’s opinion it is connected with generation of a seizure zone in a chip formation region and explains the capacity of highly worn-out cutting tools for titanium alloys machining. The paper analyses the distribution of tangential contact loads over the flank land, which pattern differs considerably for machining with a sharp-cornered edge and with a rounded cutting edge. Abbreviation and symbols: m/s - meter per second (cutting speed v); mm/r - millimeter per revolution (feed rate f); MPa - mega Pascal (specific contact load as a stress σ or τ) hf - the width of the flank wear land (chamfer) of the cutting tool, flank wear land can be natural or artificial like the one in this paper [mm]; xh - distance from the cutting edge on the surface of the flank-land [mm

  7. The implementation of the high technology methods of cutting on St 50 alloyed steel and the examination of the effects of cutting operation at the surface of material

    Directory of Open Access Journals (Sweden)

    L. Dahil

    2014-01-01

    Full Text Available Since competition has risen in the manufacturing methods of present conditions, the chance of competition has lost in the situations which new or high technologies aren’t exactly known. The proper selection is important for competing in the market conditions. In this study, the aim is to present the most advantaged cutting method for obtaining quality products by using high technology for gaining a better chance of competition. In the test, St 50 alloyed steel is used as sample. This sample is cut with the methods of laser, erosion and abrasive water jet (AWJ among the cutting operations made with the high technology. The micro structure photograph of surface of sample, which is cut, are taken and the effects of different methods of cutting on the metallurgical structure of material are compared. Also, changes are examined by performing the measurement of rigidity to the core from the edge of cutting. The most advantaged cutting method is presented by considering these examinations.

  8. Influence of assistance of high-pressure water jet in the process of rock cutting upon the temperature, wear cutting force and dustiness of the shearer pick edge

    Energy Technology Data Exchange (ETDEWEB)

    Klich, A.; Kotwica, K.; Res, J. [University of Mining and Metallurgy, Cracow (Poland)

    1995-08-01

    The cutting of artificial samples of rock with and without cutting process assistance of a high-pressure water jet was investigated in the laboratory. During the research the temperature, pick edge wear, pressure and adjacent force and dustiness were measured under several selected mining parameters. The research used Rapid 85 shearer radial picks and the adjacent Alpine picks. The cutting with radial picks was assisted with a high-pressure water jet from the front and back whereas the adjacent picks cutting was assisted only from the front. For cutting with assistance of a high-pressure water jet the Saphintec type nozzles of d=0.3, 0.55 and 0.8 mm diameter and water pressure of p=1, 20, 40 and 60 MPa were used. 6 refs., 15 figs., 3 tabs.

  9. The Polishing of Cutting-Edge Polymer-on-Glass for Pigtailing Preparation

    Directory of Open Access Journals (Sweden)

    Mohammad S.A. Rahman

    2009-01-01

    Full Text Available Problem statement: The high quality of cutting-edge surface is important in optical waveguide's efficiency. The perfect polishing of end surface is significant to deliver the best quality of light waves and minimize the device losses such as insertion loss and return loss. Hence, this research is concern on the parameters in polishing SU-8 polymer to increase the efficiency of waveguide. The main research is to study on how polishing parameter affect the cut length of the end surface of SU-8 polymer on silicon and determining the best parameters for polishing SU-8 polymer. Approach: Seven sets of rotation velocities were chosen which were 50, 100, 150, 200, 250, 300 and 350 rpm for the first part. The graph of cut length versus velocity at different sand paper size was plotted based on the data obtained from this experiment. Equation for each graph was acquired to determine relationship between these two parameters. For the second part, four samples were used. Each sample was polished with same rotation time and sandpaper size prescribed but with different rotation speed. Rotation speed is selected between 200 to 350 rpm with rotation time of 15 min using sandpaper with size of 0.3µm. Results: We found that the cut percentage of each rotation velocity are as follows: 50 rpm: ≤0.5%, 100 rpm: 0.6-1.0%, 150 rpm: 3.8-4.8%, 200 rpm: 7.7-10.6%, 250 rpm: 15.7-18.3%, 300 rpm: 25.6-27.4%, 350 rpm: 40.0-43.7%. The rotation speed suitable for polishing SU-8 polymer is below 200 rpm and the rotation speed over the point (ex. 300 rpm will cause cracking to the polymer although the silicon based layer look smooth. Conclusion: In this experiment it was found that the cut length increases as the rotation rate and the size of sand paper increased. It can also be concluded that polishing the sample at the speed of 200 rpm is the best polishing method for polymer SU-8 waveguide, at 15 min rotation time with the used of 0.3µm Aluminium oxide sandpaper size

  10. Teaching about Climate Change and Energy with Online Materials and Workshops from On the Cutting Edge

    Science.gov (United States)

    Kirk, K. B.; Manduca, C. A.; Myers, J. D.; Loxsom, F.

    2009-12-01

    Global climate change and energy use are among the most relevant and pressing issues in today’s science curriculum, yet they are also complex topics to teach. The underlying science spans multiple disciplines and is quickly evolving. Moreover, a comprehensive treatment of climate change and energy use must also delve into perspectives not typically addressed in geosciences courses, such as public policy and economics. Thus, faculty attempting to address these timely issues face many challenges. To support faculty in teaching these subjects, the On the Cutting Edge faculty development program has created a series of websites and workshop opportunities to provide faculty with information and resources for teaching about climate and energy. A web-based collection of teaching materials was developed in conjunction with the On the Cutting Edge workshops “Teaching about Energy in Geoscience Courses: Current Research and Pedagogy.” The website is designed to provide faculty with examples, references and ideas for either incorporating energy topics into existing geoscience courses or for designing or refining a course about energy. The website contains a collection of over 30 classroom and lab activities contributed by faculty and covering such diverse topics as renewable energy, energy policy and energy conservation. Course descriptions and syllabi for energy courses address audiences ranging from introductory courses to advanced seminars. Other materials available on the website include a collection of visualizations and animations, a catalog of recommended books, presentations and related references from the teaching energy workshops, and ideas for novel approaches or new topics for teaching about energy in the geosciences. The Teaching Climate Change website hosts large collections of teaching materials spanning many different topics within climate change, climatology and meteorology. Classroom activities highlight diverse pedagogic approaches such as role

  11. The Cutting Edge Technology Report: Designing Smarter Schools. [Videotape].

    Science.gov (United States)

    2000

    This videotape highlights the extent to which school buildings are deteriorating in America and the problems this causes for teaching and learning, describes the Energy Smart School campaign, and details the factors needed in building an Energy Smart School. To build schools that last and to recoup some of the building expense, it suggests…

  12. Aptamers: cutting edge technology to combat HIV/AIDS

    CSIR Research Space (South Africa)

    Khati, M

    2007-09-27

    Full Text Available .g. Heart diseases (21%YLLs) Injuries (16% YLLs) Bradshaw et al. 2003. Initial Burden of disease estimates for South Africa. SAMJ. 76(9): 682- 8 Page 3 © CSIR 2006 www.csir.co.za Common Denominator in the African burden of disease... to Combat HIV/AIDS Makobetsa Khati (MScMed, DIC, DPhil, MPH) 27th September 2006 Page 2 © CSIR 2006 www.csir.co.za South African Burden of Diseases HIV/AIDS (38% YLLs) Diseases of poverty, e.g. TB (25%YLLs) Chronic diseases, e...

  13. FDA: Cutting-Edge Technology Sheds Light on Antibiotic Resistance

    Science.gov (United States)

    ... Radiation-Emitting Products Tobacco Products Vaccines, Blood & Biologics Articulos en Espanol Alimentos y Bebidas Cosméticos Dispositivos Médicos Dispositivos que Emiten Radiación Fraude en la Salud Medicamentos Nutrición Productos Veterinarios Productos de Tabaco Salud ...

  14. Proteomics applied to exercise physiology: a cutting-edge technology.

    Science.gov (United States)

    Petriz, Bernardo A; Gomes, Clarissa P; Rocha, Luiz A O; Rezende, Taia M B; Franco, Octávio L

    2012-03-01

    Exercise research has always drawn the attention of the scientific community because it can be widely applied to sport training, health improvement, and disease prevention. For many years numerous tools have been used to investigate the several physiological adaptations induced by exercise stimuli. Nowadays a closer look at the molecular mechanisms underlying metabolic pathways and muscular and cardiovascular adaptation to exercise are among the new trends in exercise physiology research. Considering this, to further understand these adaptations as well as pathology attenuation by exercise, several studies have been conducted using molecular investigations, and this trend looks set to continue. Through enormous biotechnological advances, proteomic tools have facilitated protein analysis within complex biological samples such as plasma and tissue, commonly used in exercise research. Until now, classic proteomic tools such as one- and two-dimensional polyacrylamide gel electrophoresis have been used as standard approaches to investigate proteome modulation by exercise. Furthermore, other recently developed in gel tools such as differential gel electrophoresis (DIGE) and gel-free techniques such as the protein labeling methods (ICAT, SILAC, and iTRAQ) have empowered proteomic quantitative analysis, which may successfully benefit exercise proteomic research. However, despite the three decades of 2-DE development, neither classic nor novel proteomic tools have been convincingly explored by exercise researchers. To this end, this review gives an overview of the directions in which exercise-proteome research is moving and examines the main tools that can be used as a novel strategy in exercise physiology investigation.

  15. An Analysis of English Speaking Teaching Approaches Based on New Cutting Edge

    Institute of Scientific and Technical Information of China (English)

    WANG Lu

    2016-01-01

    Speech production involves four main processes including conceptualization, formulation, articulation and self-moni-toring. During these processes, learners need to use sociocultural, pragmatic and discourse knowledge in conceptualization, vo-cabulary and grammar in formulation, and phonological knowledge in articulation. By utilizing the knowledge mentioned above, learners are expected to possess such speaking skills as routine skills and improvisation skills. Current speaking teaching meth-ods are broadly divided into“skill-getting”direct approach and“skill-using”indirect approach. As they are mutually comple-mentary, a balance of activities types should be provided. On the basis of these theories, a modification of a listening and speak-ing lesson in New Cutting Edge Pre-intermediate is designed to get students notice, retrieve and use some useful expressions for giving direction.

  16. MALDI mass spectrometry imaging: A cutting-edge tool for fundamental and clinical histopathology.

    Science.gov (United States)

    Longuespée, Rémi; Casadonte, Rita; Kriegsmann, Mark; Pottier, Charles; Picard de Muller, Gaël; Delvenne, Philippe; Kriegsmann, Jörg; De Pauw, Edwin

    2016-07-01

    Histopathological diagnoses have been done in the last century based on hematoxylin and eosin staining. These methods were complemented by histochemistry, electron microscopy, immunohistochemistry (IHC), and molecular techniques. Mass spectrometry (MS) methods allow the thorough examination of various biocompounds in extracts and tissue sections. Today, mass spectrometry imaging (MSI), and especially matrix-assisted laser desorption ionization (MALDI) imaging links classical histology and molecular analyses. Direct mapping is a major advantage of the combination of molecular profiling and imaging. MSI can be considered as a cutting edge approach for molecular detection of proteins, peptides, carbohydrates, lipids, and small molecules in tissues. This review covers the detection of various biomolecules in histopathological sections by MSI. Proteomic methods will be introduced into clinical histopathology within the next few years.

  17. Colliding worlds how cutting-edge science is redefining contemporary art

    CERN Document Server

    Miller, Arthur I

    2014-01-01

    In recent decades, an exciting new art movement has emerged in which artists illuminate the latest advances in science. Some of their provocative creations - a live rabbit implanted with the fluorescent gene of a jellyfish, a gigantic glass-and-chrome sculpture of the Big Bang itself - can be seen in traditional art museums and magazines, while others are being made by leading designers at Pixar, Google's Creative Lab and the MIT Media Lab. Arthur I. Miller takes readers on a wild journey to explore this new frontier. From the movement's origins a century ago - when Einstein shaped Cubism and X-rays affected fine photography - to the latest discoveries of biotechnology, cosmology and quantum physics, Miller shows how today's artists and designers are producing work at the cutting edge of science.

  18. RETRACTED: The Virtual Cutting Edge: Adolescent Self-injury and YouTube.

    Science.gov (United States)

    Garthe, C; Ouellette, L; Seamon, J P; Jones, J S

    2015-10-01

    This article has been retracted: please see Elsevier Policy on Article Withdrawal (http://www.elsevier.com/locate/withdrawalpolicy). This article has been retracted at the request of the Editor-in-Chief and Authors. We wish to retract the abstract "The Virtual Cutting Edge: Adolescent Self-injury and YouTube," published in the October 2015 issue of Annals. The abstract excessively borrowed from the text and methodology of a previous study published elsewhere.(1) All authors recognize the seriousness of this issue and apologize to the editors and readers of Annals. Jeffrey S. Jones, MD Chad Garthe, MD Lindsey Ouellette, MS Jason Seamon, DO Department of Emergency Medicine MSU College of Human Medicine Grand Rapids, MI 1. Lewis SP, Heath NL, St. Denis JM, et al. The scope of nonsuicidal self-injury on YouTube. Pediatrics. 2011;1127:e552-e557. Copyright © 2016. Published by Elsevier Inc.

  19. Defining the effect of sweep tillage tool cutting edge geometry on tillage forces using 3D discrete element modelling

    Directory of Open Access Journals (Sweden)

    Mustafa Ucgul

    2015-09-01

    Full Text Available The energy required for tillage processes accounts for a significant proportion of total energy used in crop production. In many tillage processes decreasing the draft and upward vertical forces is often desired for reduced fuel use and improved penetration, respectively. Recent studies have proved that the discrete element modelling (DEM can effectively be used to model the soil–tool interaction. In his study, Fielke (1994 [1] examined the effect of the various tool cutting edge geometries, namely; cutting edge height, length of underside rub, angle of underside clearance, on draft and vertical forces. In this paper the experimental parameters of Fielke (1994 [1] were simulated using 3D discrete element modelling techniques. In the simulations a hysteretic spring contact model integrated with a linear cohesion model that considers the plastic deformation behaviour of the soil hence provides better vertical force prediction was employed. DEM parameters were determined by comparing the experimental and simulation results of angle of repose and penetration tests. The results of the study showed that the simulation results of the soil-various tool cutting edge geometries agreed well with the experimental results of Fielke (1994 [1]. The modelling was then used to simulate a further range of cutting edge geometries to better define the effect of sweep tool cutting edge geometry parameters on tillage forces. The extra simulations were able to show that by using a sharper cutting edge with zero vertical cutting edge height the draft and upward vertical force were further reduced indicating there is benefit from having a really sharp cutting edge. The extra simulations also confirmed that the interpolated trends for angle of underside clearance as suggested by Fielke (1994 [1] where correct with a linear reduction in draft and upward vertical force for angle of underside clearance between the ranges of −25 and −5°, and between −5 and 0°. The

  20. The Landsat Image Mosaic of Antarctica (LIMA): A Cutting-Edge Way for Students and Teachers to Learn about Antarctica

    Science.gov (United States)

    Campbell, Brian; Bindschadler, Robert

    2009-01-01

    By studying Antarctica via satellite and through ground-truthing research, we can learn where the ice is melting and why. The Landsat Image Mosaic of Antarctica (LIMA), a new and cutting-edge way for scientists, researchers, educators, students, and the public to look at Antarctica, supports this research and allows for unprecedented views of our…

  1. Cutting-edge research in developing the library of the future new paths for building future services

    CERN Document Server

    Eden, Bradford Lee

    2015-01-01

    Cutting-Edge Research in the 21st-Century Academic Library: New Paths for Building Future Services explores examples of exciting new library services and workflows and provides opportunities for the rest of the library profession to model and adapt for their own communities and patrons.

  2. Analysis of cutting-edge techniques in the high voltage and high power adjustable speed drive systems

    Institute of Scientific and Technical Information of China (English)

    2009-01-01

    The high voltage and high power adjustable speed drive (ASD) system is one of the most attractive fields in power electronics, and it is also a very crucial technique for energy saving and emission reduction. This paper discussed and analyzed the main cutting-edge knowledge and issues in the process of exploiting the high voltage and high power ASD system.

  3. Sharpening the cutting edge: additional considerations for the UK debates on embryonic interventions for mitochondrial diseases.

    Science.gov (United States)

    Haimes, Erica; Taylor, Ken

    2017-12-01

    In October 2015 the UK enacted legislation to permit the clinical use of two cutting edge germline-altering, IVF-based embryonic techniques: pronuclear transfer and maternal spindle transfer (PNT and MST). The aim is to use these techniques to prevent the maternal transmission of serious mitochondrial diseases. Major claims have been made about the quality of the debates that preceded this legislation and the significance of those debates for UK decision-making on other biotechnologies, as well as for other countries considering similar legislation. In this article we conduct a systematic analysis of those UK debates and suggest that claims about their quality are over-stated. We identify, and analyse in detail, ten areas where greater clarity, depth and nuance would have produced sharper understandings of the contributions, limitations and wider social impacts of these mitochondrial interventions. We explore the implications of these additional considerations for (i) the protection of all parties involved, should the techniques transfer to clinical applications; (ii) the legitimacy of focussing on short-term gains for individuals over public health considerations, and (iii) the maintenance and improvement of public trust in medical biotechnologies. We conclude that a more measured evaluation of the content and quality of the UK debates is important and timely: such a critique provides a clearer understanding of the possible, but specific, contributions of these interventions, both in the UK and elsewhere; also, these additional insights can now inform the emerging processes of implementation, regulation and practice of mitochondrial interventions.

  4. The state-of-the-art of emergency contraception with the cutting edge drug

    Directory of Open Access Journals (Sweden)

    Sarkar, Narendra Nath

    2011-01-01

    Full Text Available The objective of this study is to evaluate and elucidated the potential of selective progesterone receptor modulators (SPRMs to be an effective emergency contraception (EC. The data are extracted from the literature through the MEDLINE database service from 2000–2010. The SPRMs are in fact progesterone receptor ligands that could bind to progesterone receptor (PR and exert antagonistic, agonistic or mixed agonist-antagonistic effects. These SPRMs are mifepristone, onapristone, asoprisnil, ulipristal, proellex among other compounds. Currently developed SPRMs may exert contraceptive effects by inhibiting ovulation and retarding endometrial synchronization. Low-doses of progesterone antagonists retard endometrial maturation without affecting ovulation. Mifepristone being a SPRM is effective for prevention of pregnancy but with prostaglandin acts as an excellent abortifacient; yet could not compete with levonorgestrel as EC. However, a single dose of 30 mg ulipristal acetate, another SPRM with similar effectiveness and side effect profiles as 1.5 mg levonorgestrel EC, has shown wider ‘window of effect’ by inhibition of the LH peak even if administered at the advanced pre-ovulatory phase, a time when use of levonorgestrel EC is no longer effective. Thus, ulipristal acetate goes one-step ahead of levonorgestrel in the field of emergency contraception treatment. Further studies are needed to explore the potential of other SPRMs to be cutting edge emergency contraceptive drugs.

  5. Effect of Rake Angle on Stress, Strain and Temperature on the Edge of Carbide Cutting Tool in Orthogonal Cutting Using FEM Simulation

    Directory of Open Access Journals (Sweden)

    Hendri Yanda

    2010-11-01

    Full Text Available Demand for higher productivity and good quality for machining parts has encourage many researchers to study the effects of machining parameters using FEM simulation using either two or three dimensions version. These are due to advantages such as software package and computational times are required. Experimental work is very costly, time consuming and labor intensive. The present work aims to simulate a three-dimensional orthogonal cutting operations using FEM software (Deform-3D to study the effects of rake angle on the cutting force, effective stress, strain and temperature on the edge of carbide cutting tool. There were seven runs of simulations. All simulations were performed for various rake angles of -15 deg, -10 deg, -5 deg, 0 deg, +5 deg, +10 deg, and +15 deg. The cutting speed, feed rate and depth of cut (DOC were kept constant at 100 m/min, 0.35 mm/rev and 0.3 mm respectively. The work piece used was ductile cast iron FCD500 grade and the cutting tool was DNMA432 series (tungsten, uncoated carbide tool, SCEA = 0; and radius angle 55 deg. The analysis of results show that, the increase in the rake angle from negative to positive angle, causing the decrease in cutting force, effective stress and total Von Misses strain. The minimum of the cutting force, effective stress and total Von Misses strain were obtained at rake angle of +15 deg. Increasing the rake caused higher temperature generated on the edge of carbide cutting tool and resulted in bigger contact area between the clearance face and the workpiece, consequently caused more friction and wear. The biggest deformation was occurred in the primary deformation zone, followed by the secondary deformation zone. The highest stress was also occurred in the primary deformation zone. But the highest temperature on the chip usually occurs in secondary deformation zone, especially in the sliding region, because the heat that was generated in the sticking region increased as the workpiece was

  6. Feasibility Study of Cryogenic Cutting Technology by Using a Computer Simulation and Manufacture of Main Components for Cryogenic Cutting System

    Energy Technology Data Exchange (ETDEWEB)

    Kim, Sung Kyun; Lee, Dong Gyu; Lee, Kune Woo [Korea Atomic Energy Research Institute, Daejeon (Korea, Republic of); Song, Oh Seop [Chungnam National University, Deajeon (Korea, Republic of)

    2009-06-15

    Cryogenic cutting technology is one of the most suitable technologies for dismantling nuclear facilities due to the fact that a secondary waste is not generated during the cutting process. In this paper, the feasibility of cryogenic cutting technology was investigated by using a computer simulation. In the computer simulation, a hybrid method combined with the SPH (smoothed particle hydrodynamics) method and the FE (finite element) method was used. And also, a penetration depth equation, for the design of the cryogenic cutting system, was used and the design variables and operation conditions to cut a 10 mm thickness for steel were determined. Finally, the main components of the cryogenic cutting system were manufactures on the basis of the obtained design variables and operation conditions.

  7. State-of-the-art MCT photodiodes for cutting-edge sensor applications by AIM

    Science.gov (United States)

    Figgemeier, H.; Hanna, S.; Eich, D.; Fries, P.; Mahlein, K.-M.; Wenisch, J.; Schirmacher, W.; Beetz, J.; Breiter, R.

    2017-02-01

    For about 30 years, AIM has been ranking among the leading global suppliers for high-performance MCT infrared detectors, with its portfolio spanning the photosensitivity cut-off range from the SWIR to the VLWIR and from 1st generation to 3rd generation FPA devices. To meet the market demands for SWaP-C- and IR-detectors with additional functionalities such as multicolor detection, AIM employs both LPE and MBE technology. From AIḾs line of highest-performance single color detectors fabricated by LPE, we will present our latest excellent results of 5.3 μm cut-off MWIR MCT detectors with 1024x768 pixels and a 10 μm pixel pitch. AIM's powerful low dark current LWIR and VLWIR p-on-n device technology on LPE-grown MCT has now been extended to the MWIR spectral range. A comparison of results from n-on-p and p-on-n MWIR MCT planar photodiode arrays is presented. Operating temperatures of 160 K and higher, in conjunction with low defect density and excellent thermal sensitivity (NETD) are attained. The results achieved for LPE MWIR are compared to MBE MWIR data. For both the cost-efficient production of MWIR single color MCT detectors, as well as 3rd generation multicolor MCT detectors, AIM makes use of MBE growth of MCT on large-area GaAs substrates. The now-available AIM MWIR single color MBE MCT detectors grown on GaAs are qualified, delivered, and have reached a maturity fully meeting customers' requirements. Representing AIM's multicolor detector development, latest test results on a 640x512 pixels with a 20 μm pitch design will be presented. The MWIR/MWIR diodes demonstrate high QE, very low color cross talk, and excellent NETD in conjunction with low defect densities.

  8. On the Cutting Edge Professional Development Program - An effective model built from years of experience

    Science.gov (United States)

    Bruckner, M. Z.; Macdonald, H.; Beane, R. J.; Manduca, C. A.; Mcconnell, D. A.; Mogk, D. W.; Tewksbury, B. J.; Wiese, K.; Wysession, M. E.; Iverson, E. A. R.; Fox, S.

    2015-12-01

    The On the Cutting Edge (CE) program offers a successful model for designing and convening professional development events. Information about the model is now available on the CE website. The program model has evolved from more than 12 years of experience, building with input from strong leaders and participants. CE offers face-to-face, virtual, and hybrid events, and features a rich website that supports these professional development events as well as a growing community with a shared interest in effective geoscience teaching. Data from national surveys, participant feedback, and self-report data indicate the program's success in improving undergraduate geoscience education. Successes are also demonstrated in classroom observations using RTOP, indicating a significant difference in teaching style among participants and non-participants. A suite of web pages, with a planning timeline, provides guidance to those interested in designing and convening face-to-face or virtual events based on the CE model. The pages suggest ways to develop robust event goals and evaluation tools, how to choose strong leaders and recruit diverse participants, advice for designing effective event programs that utilize participant expertise, websites, and web tools, and suggestions for effectively disseminating event results and producing useful products. The CE model has been successfully transferred to projects that vary in scale and discipline. Best practices from the CE model include (1) thinking of the workshop as shared enterprise among conveners and participants; (2) incorporating conveners and participants who bring diverse viewpoints and approaches; (3) promoting structured discussions that utilize participants' expertise; (4) emphasizing practical strategies to effect change; and (5) using the website as a platform to prepare for the workshop, share ideas, and problem-solve challenges. Learn more about how to utilize this model for your project at:serc.carleton.edu/NAGTWorkshops/workshops/convene

  9. Investigation of the cut-edge corrosion of organically-coated galvanized steel after accelerated atmospheric corrosion test

    Directory of Open Access Journals (Sweden)

    Reşit Yıldız

    2015-11-01

    Full Text Available The cut edge corrosion of organically coated (epoxy, polyurethane and polyester galvanized steel was investigated using electrochemical impedance spectroscopy (EIS. Measurements were performed on specimens that had been tested in an accelerated atmospheric corrosion test. The samples were subjected to 10 s fogging and 1 h awaiting cycles in an exposure cabinet (120 and 180 days with artificial acid rain solution. According to the investigation, the coatings were damaged from the cut edge into the sheet, this distance was about 0.8 cm. These defects were more pronounced at after 180 days in proportion to after 120 days.

  10. Analysis of cutting-edge techniques in the high voltage and high power adjustable speed drive systems

    Institute of Scientific and Technical Information of China (English)

    ZHAO ZhengMing; BAI Hua; YUAN LiQiang

    2009-01-01

    The high voltage and high power adjustable speed drive (ASD) system is one of the most attractive fields in power electronics, and it is also a very crucial technique for energy saving and emission re-duction. This paper discussed and analyzed the main cutting-edge knowledge and issues in the proc-ess of exploiting the high voltage and high power ASD system.

  11. m-restricted Edge cut of Graphs with 3 Circumference%周长为3的m限制边割连通图

    Institute of Scientific and Technical Information of China (English)

    王经雨; 朱铁丹

    2009-01-01

    如果连通图的G存在边割S,使得G-S的每一个连通分支都含有至少m个顶点,则称图G是m限制边连通的.本文刻画了周长为3的m限制边连通图.%An m-restricted edge cut is an edge cut of a connected graph which disconnects this graph with each component having order at least m, the paper characterize m-restricted edge cut of graphs with 3 circumference.

  12. Teaching Service Learning in the Geosciences: An On the Cutting Edge Workshop Report

    Science.gov (United States)

    Bruckner, M. Z.; Laine, E. P.; Mogk, D. W.; O'Connell, S.; Kirk, K. B.

    2010-12-01

    Service learning is an instructional method that combines community service and academic instruction within the context of an established academic course. It is a particularly effective approach that uses active and experiential learning to develop the academic skills required of a course of study and to simultaneously address authentic community needs. Service learning projects can energize and motivate students by engaging a sense of civic responsibility by working in concert with community partners. The geosciences provide abundant opportunities to develop service learning projects on topics related to natural hazards, resources, land use, water quality, community planning, public policy, and education (K-12 and public outreach). To explore the opportunities of teaching service learning in the geosciences, the On the Cutting Edge program convened an online workshop in February 2010. The goals of the workshop were to: 1) introduce the principles and practices of effective service learning instructional activities; 2) provide examples of successful service learning projects and practical advice about "what works;" 3) provide participants with the opportunity to design, develop, and refine their own service learning courses or projects; 4) develop collections of supporting resources related to the pedagogy of service learning; and 5) support a community of scholars interested in continued work on service learning in the geoscience curriculum. The workshop consisted of a series of web-based synchronous and asynchronous sessions, including presentations from experienced practitioners of service learning, panel discussions, threaded discussions, and editable web pages used to develop new material for the website. Time was also provided for small group and individual work and for participants to peer-review each others' service learning projects and to revise their own activities based on reviewer comments. Insights from the workshop were integrated into new web pages

  13. [JSPS Asian core program on cutting-edge organic chemistry in Asia].

    Science.gov (United States)

    Isobe, Minoru; Nishikawa, Toshio

    2009-04-01

    The vision to establish this program was to establish and extend cooperative research efforts beyond the intraregional boundaries. The Japan Society for the Promotion of Science (JSPS) has taken an initiative to support an Asian Core Program, which aims to create world-class research hubs within the Asian region and foster the development of the next generation of leading researchers by establishing sustainable collaborative relations among research and educational institutions in Asian countries. Nagoya University strongly supports and is the Core University of this program with Minoru Isobe and Toshio Nishikawa serving as the coordinator. Representing their respective countries/regions, Guo-Qiang Lin and Zhu-Jun Yao (China, Shanghai), Sunggak Kim and Kwan-Soo Kim (Korea), Somsak Ruchirawat (Thailand), and Chun-Chen Liao and Biing-Jiun Uang (China, Taipei) share in the vision to enhance collaborative efforts. As coordinators they have invited many cooperative universities/institutes in their home countries/regions to start the network since 2005. Singapore (Tech-Peng Loh) has joined lately, and Hong Kong is represented by Henry Wong. All cooperating regions also agreed to support this program by acquiring matching funds for the duration of the program, that is, until March 2010. This program is jointly supported by the JSPS (Japan), the NNSFC (China, Beijing), the NSCT (China, Taipei), the KOSEF/CMDS (Korea), the NRCT/CRI (Thailand), and the IUPAC for an East Asian Network Task group project. Pauline Chiu takes the general secretary work. The initiation of the Asian Core Program and the Inauguration Conference (The 0th International Conference on Cutting-Edge Organic Chemistry in Asia; ICCEOCA-0) was held in Nagoya (2006. 3), which was followed by ICCEOCA-1 in Okinawa, Japan (2006. 10), ICCEOCA-2 in Busan, Korea (2007. 9), ICCEOCA-3 in Hangzhou, China (2008. 10). A post symposium of ICCEOCA-1 was held in Hsinchu, Taiwan (2006. 10), and a satellite symposium of

  14. Cutting

    Science.gov (United States)

    ... a traumatic experience, such as living through abuse , violence, or a disaster. Self-injury may feel like ... embarrassed." Sometimes self-injury affects a person's body image. Jen says, "I actually liked how the cuts ...

  15. Cutting Technology for Decommissioning of the Reactor Pressure Vessels in Nuclear Power Plants

    Energy Technology Data Exchange (ETDEWEB)

    Jeong, Kwan Seong; Kim, Geun Ho; Moon, Jei Kwon; Choi, Byung Seon [Korea Atomic Energy Research Institute, Daejeon (Korea, Republic of)

    2012-05-15

    Lots of nuclear power plants have been decommissioned during the last 2 decades. An essential part of this work is the dismantling of the Reactor Pressure Vessel and its Internals. For this purpose a wide variety of different cutting technologies have been developed, adapted and applied. A detailed introduction to Plasma Arc cutting, Contact Arc Metal cutting and Abrasive Water Suspension Jet cutting is given, as it turned out that these cutting technologies are particularly suitable for these type of segmentation work. A comparison of these technologies including gaseous emissions, cutting power, manipulator requirements as well as selected design approaches are given. Process limits as well as actual limits of application are presented

  16. IMPACT OF DEPTH OF CUT ON CHIP FORMATION IN AZ91HP MAGNESIUM ALLOY MILLING WITH TOOLS OF VARYING CUTTING EDGE GEOMETRY

    Directory of Open Access Journals (Sweden)

    Olga Gziut

    2015-05-01

    Full Text Available Safety of Mg milling processes can be expressed by means of the form and the number of fractions of chips formed during milling. This paper presents the state of the art of magnesium alloys milling technology in the aspect of chip fragmentation. Furthermore, the impact of the depth of cut ap and the rake angle γ on the number of chip fractions was analysed in the study. These were conducted on AZ91HP magnesium cast alloy and milling was performed with carbide tools of varying rake angle values (γ = 5º and γ = 30º. It was observed that less intense chip fragmentation occurs with decreasing depth of cut ap. The number of chip fractions was lower at the tool rake angle of γ = 30º. The test results were formulated as technological recommendations according to the number of generated chip fractions.

  17. Improving Climate Science Education by Supporting Faculty: Climate Programs from On the Cutting Edge

    Science.gov (United States)

    Wiese, K.; Kirk, K. B.; Manduca, C. A.; Shellito, L. J.; Sztein, E.; Bruckner, M. Z.

    2011-12-01

    Students arrive in our classrooms with a wide range of viewpoints on climate change. Some carry misconceptions resulting from media portrayal of the subject; others have strong feelings about the policy of climate change that overshadow their understanding of the science; while some already grasp the basics of climate science and are thirsty for a more in-depth treatment. In any of these cases, the topic of climate change is likely to be of high interest to students and will challenge faculty to be well-versed in the science, the policy, and in effective pedagogic strategies. The On the Cutting Edge project continues its emphasis on climate science, climate change and energy resources with ongoing professional development events. An underlying theme of all of these events is to help faculty be more effective teachers by providing up-to-date science, examples of promising pedagogies and a forum to network with others who teach similar subjects. A monthly webinar and book club series about teaching climate and energy was offered throughout the 2010-2011 academic year. These one-hour events allowed faculty a convenient way to learn about science topics such as carbon capture and storage, nuclear energy, thermohaline circulation, alternative energy, or the energy-water nexus. Some of the webinars focused on pedagogic approaches, including teaching with climate models, dealing with misconceptions, or using local energy issues for a semester-long jigsaw project. Webinar participants reported that they could expand their teaching to include these topics, they increased their comfort level in presenting those subjects and answering student questions, and they learned where to turn for additional references. An online workshop, Teaching about Earth's Climate Using Data and Numerical Models, was held in October 2010. Participants learned about different types of models, the strategies for teaching with models and how to use online datasets. The workshop also provided

  18. A State-of-the-Art Report on Cutting Technologies for Decommissioning Nuclear Facilities

    Energy Technology Data Exchange (ETDEWEB)

    Kim, Sung Kyun; Lee, Dong Gyu; Lee, Kune Woo; Jung, Chong Hun

    2007-10-15

    This report provides the status of the cryogenic cutting technology as a new dismantling technology for dismantling radioactive nuclear facilities and also presents the direction of study to apply it to a radioactive nuclear facility research aim of its nuclear. This report consists of four chapter : - 1. Background and objectives of dismantling technology for dismantling a radioactive nuclear facility. - 2. Analysis of the status of conventional cutting technologies - 3. Analysis of the status of cryogenic cutting technology - 4. Discussion, conclusion, and future work on state-of-the-art technology of dismantling for nuclear facilities.

  19. Precision Control of Billet Limited WeightCutting Technology Cutting Technology%方坯定重切割精度控制的提高

    Institute of Scientific and Technical Information of China (English)

    左康君; 李智勇; 王振涛; 朱童峰

    2011-01-01

    This article introduces the steel works are shipped on the billet limited weight cutting technology characteristics of control and detailed analysis of the technology in cutting,weighing,network management need to solve the problem.%炼钢厂方坯定重切割精度控制的技术特点,分析该技术在切割控制、称重、网络管理方面需要解决的问题。

  20. Edge Glued Wood Panel Technology and an Assessment on the Development of Edge Glued Wood Panel Industry

    Directory of Open Access Journals (Sweden)

    Tuncer Dilik

    2012-01-01

    Full Text Available In this research, it is aimed to determine the general situation of edge glued wood panel industry that is rapidly developing in Turkey with the reasons of this development similar to the development edge glued wood panel industry in the world. Besides, starting from its definition, there are information about edge glued wood panel, comparison with other panel products and technology preferences of production. As the result of this study, there are 3 essential reasons of the rapid development of edge glued wood panel industry in Turkey. These are; (1 Environmental health and ecological approaches as a movement of thought having impact on the consumer behaviors and rapidly improving throughout the world, (2 Having less production and investment cost compared to the other wood based material production and investments and (3 In addition to the advantages owned when compared to the other wood based materials, having the production technology involving flexible production systems to respond to every demand level. According to the data related to edge glued wood panel demand and supplies, the production of edge glued wood panels replace to East Europe where there is also Turkey. It is determined that investment and cost of Turkish edge glued wood panel are mainly in Marmara region (43.3% and raw material (43% respectively. 67% coniferous and 33% broad leaved tree species are used in Turkish edge glued wood panel production. The most preferred edge glued wood panel thicknesses are 16, 19, 30 and 42 mm. The technological preferences of the manufacturers depend on their machines and production line with optimization systems where as the users’ preferences are price and quality by 90%. It is determined that with its structural condition, the sector is open for investment and development.

  1. STATISTICAL ANALYSIS OF ENERGY CONSUMPTION DURING THE CUTTING OF FROZEN MEAT BLOCKS USING MULTIPLE EDGE TOOL

    Directory of Open Access Journals (Sweden)

    A. B. Lisitsyn

    2016-01-01

    Full Text Available Abstract Currently, frozen meat blocks are widely used in meat processing for production of sausages and other meat products. Efficient grinding of frozen raw meat is an urgent task for meat industry professionals. The V.M.  Gorbatov All-Russian Meat Research Institute has developed energy- and resource-saving process for grinding of frozen meat blocks by milling. Determination of energy consumption for grinding of raw materials by multiple edge tools (milling tools is the most important step in the creating of new type mincing machine.

  2. [Scanning electron microscopic investigations of cutting edge quality in lamellar keratotomy using the Wavelight femtosecond laser (FS-200) : What influence do spot distance and an additional tunnel have?

    Science.gov (United States)

    Hammer, T; Höche, T; Heichel, J

    2017-07-24

    Femtosecond lasers (fs-lasers) are established cutting instruments for the creation of LASIK flaps. Previous studies often showed even rougher surfaces after application of fs-laser systems compared to lamellar keratotomy with mechanical microkeratomes. When cutting the cornea with fs-lasers, an intrastromal gas development occurs, which has a potentially negative influence on the cutting quality if the gas cannot be dissipated; therefore, manufacturers have chosen the way of gas assimilation in so-called pockets. The investigated system creates a tunnel which opens under the conjunctiva. The aim of this study was to investigate the effects of a tunnel as well as the influence of different spot distances on the quality of cut surfaces and edges. In this experimental study on freshly enucleated porcine eyes (n = 15), the following cuts were carried out with the FS-200 (Wavelight, Erlangen, Germany): 1. standard setting (spot and line separation 8 µm), 2. with tunnel for gas drainage, 3. without gas-conducting tunnel, 4. with increased spot spacing (spot and line separation 9 μm instead of 8 μm) and 5. with reduced spot spacing (spot and line separation 7 μm instead of 8 μm). Subsequently, scanning electron microscopy (FEI Quanta 650, Hillsboro, OR) of the cut edges and surfaces as well as the gas drain tunnel were performed. The evaluation was based on an established score. The current fs-laser system (200 Hz) is able to create smooth cutting surfaces and sharp edges. The changed density of laser pulses compared to the standard settings with a reduced or increased distance between the pulses, did not achieve any further improvement in the surface quality. The gas-conducting tunnel could be detected by scanning electron microscope. In the case of cutting without a tunnel, roughened surfaces and irregularities on the cutting edges were found. When the FS-200 fs-laser is used, LASIK cuts with very smooth cut surfaces and sharp cutting

  3. Quality Analysis of Cutting Steel Using Laser

    Directory of Open Access Journals (Sweden)

    Vladislav Markovič

    2013-02-01

    Full Text Available The article explores the quality dependence of the edge surface of steel C45 LST EN 10083-1 obtained cutting the material using laser on different cutting regimes and variations in the thickness of trial steel. The paper presents the influence of the main modes of laser cutting equipment Trulaser 3030, including cutting speed, pressure, angle and the thickness of the surface on the quality characteristics of the sample. The quality of the edge after laser cutting is the most important indicator influencing such technological spread in industry worldwide. Laser cutting is the most popular method of material cutting. Therefore, the article focuses on cutting equipment, cutting defects and methods of analysis. Research on microstructure, roughness and micro-toughness has been performed with reference to edge samples. At the end of the publication, conclusions are drawn.Article in Lithuanian

  4. Quality Analysis of Cutting Steel Using Laser

    Directory of Open Access Journals (Sweden)

    Vladislav Markovič

    2012-12-01

    Full Text Available The article explores the quality dependence of the edge surface of steel C45 LST EN 10083-1 obtained cutting the material using laser on different cutting regimes and variations in the thickness of trial steel. The paper presents the influence of the main modes of laser cutting equipment Trulaser 3030, including cutting speed, pressure, angle and the thickness of the surface on the quality characteristics of the sample. The quality of the edge after laser cutting is the most important indicator influencing such technological spread in industry worldwide. Laser cutting is the most popular method of material cutting. Therefore, the article focuses on cutting equipment, cutting defects and methods of analysis. Research on microstructure, roughness and micro-toughness has been performed with reference to edge samples. At the end of the publication, conclusions are drawn.Article in Lithuanian

  5. Observation of Built-up Edge Formation on a Carbide Cutting Tool with Machining Aluminium Alloy under Dry and Wet Conditions

    Directory of Open Access Journals (Sweden)

    Azlan U.A.A.

    2017-01-01

    Full Text Available This paper presents the morphology of built-up edge (BUE formation under wet and dry conditions with low and high cutting speeds. The workpiece materials and cutting tools selected for this work were aluminium alloy and canela carbide inserts graded PM25. The cutting tools underwent turning operation machining tests and their performance was evaluated by the flank wear and observation of the tool wear area. The machining tests were conducted at different spindle speeds and feed rates while the cut depth was kept constant. The analysis showed that formation of the BUE was dominant at low cutting speeds in dry conditions, but in wet conditions at high cutting speeds, a better performance was exhibited in terms of wear analysis.

  6. Incorporating Cutting Edge Scientific Results from the MARGINS-GeoPRISMS Program into the Undergraduate Curriculum: An Overview

    Science.gov (United States)

    Morgan, J. K.; Costa, A.; Goodliffe, A. M.; Marshall, J. S.; Iverson, E. A. R.

    2014-12-01

    The NSF-MARGINS Program funded a decade of research on continental margin processes, organized around four initiatives: (1) chemical cycling in subduction zones (SubFac), (2) seismogenic zone processes at subduction zones (SEIZE), (3) rupturing continental lithosphere (RCL), and (4) source to sink sediment cycling at continental margins (S2S). The outcomes of this research provided critical new observations and insights into fundamental geologic processes along continental margins, and associated geologic hazards and economic resources. The transition to the successor GeoPRISMS Program provided a unique opportunity to identify and synthesize the highlights of MARGINS research, and to disseminate this knowledge to educators and students who will carry out the next phase of cutting-edge scientific research. The NSF TUES Program funded a two-year project entitled: "Bringing NSF MARGINS Continental Margins Research into the Undergraduate Curriculum," enabling development of ~15 mini-lessons drawing on key MARGINS results and data sets. The mini-lesson development team consists of 18 educators and scientists, grouped by initiative, and guided by experts in MARGINS science and current educational research and practices. Webinars and virtual check-ins enable team interactions and exchange of ideas and experiences; in person workshops solidified pedagogical approaches and assessment strategies, as well as initiative frameworks for the mini-lessons. Field testing by team members and outside volunteers during AY 2013-14 identified challenges and opportunities, guiding mini-lesson revision and finalization. The MARGINS mini-lessons define coordinated, data-rich educational resources, easy to access and free to the public, ready to be incorporated into multiple common geoscience course frameworks, taking the first step toward building a community of practice of scientists and curriculum specialists with the shared goal of moving cutting-edge science into undergraduate

  7. George E. Pake Prize Lecture: Physical Sciences Research at IBM: Still at the Cutting Edge

    Science.gov (United States)

    Theis, Thomas

    2015-03-01

    The information technology revolution is in its ``build out'' phase. The foundational scientific insights and hardware inventions are now many decades old. The microelectronics industry is maturing. An increasing fraction of the total research investment is in software and services, as applications of information technology transform every business and every sector of the public and private economy. Yet IBM Research continues to make substantial investments in hardware technology and the underlying physical sciences. While some of this investment is aimed at extending the established transistor technology, an increasing fraction is aimed at longer-term and possibly disruptive research - new devices for computing, such as tunneling field-effect transistors and nanophotonic circuits, and new architectures, such as neurosynaptic systems and quantum computing. This research investment is a bet that the old foundations of information technology are ripe for reinvention. After all, today's information technology devices and systems operate far from any fundamental limits on speed and energy efficiency. But how can IBM make risky long-term research investments in an era of global competition, with financial markets focused on the short term? One important answer is partnerships. Since its early days, IBM Research has pursued innovation in information technology and innovation in the ways it conducts the business of research. By continuously evolving new models for research and development partnerships, it has extended its global reach, increased its impact on IBM's customers, and expanded the breadth and depth of its research project portfolio. Research in the physical sciences has often led the way. Currently on assignment to the Semiconductor Research Corporation.

  8. Application research on hydraulic coke cutting monitoring system based on optical fiber sensing technology

    Science.gov (United States)

    Zhong, Dong; Tong, Xinglin

    2014-06-01

    With the development of the optical fiber sensing technology, the acoustic emission sensor has become one of the focal research topics. On the basis of studying the traditional hydraulic coke cutting monitoring system, the optical fiber acoustic emission sensor has been applied in the hydraulic coke cutting monitoring system for the first time, researching the monitoring signal of the optical fiber acoustic emission sensor in the system. The actual test results show that using the acoustic emission sensor in the hydraulic coke cutting monitoring system can get the real-time and accurate hydraulic coke cutting state and the effective realization of hydraulic coke cutting automatic monitoring in the Wuhan Branch of Sinopec.

  9. Methodological diversity to reach patients along the margins, in the shadows, and on the cutting edge.

    Science.gov (United States)

    Villagran, Melinda

    2011-03-01

    There is extensive research on novel uses of visual and social media to disseminate health information, but fewer researchers have considered how to use new communication channels to listen to health care consumers and gather data for research purposes. Current statistics and literature were reviewed to assess potential uses of interactive and visual media for health communication data collection. This essay examines the topic of methodological diversity by offering a few examples from current literature and practice on how interactive media can be more fully utilized to engage with research participants, discover appropriate research questions, and collect quantitative and qualitative health communication data. Social networks, mobile-based technology, photovoice, and microblogging have potential benefits for collecting patient feedback for research, but there are also limitations of using technology-based collection methods. Researchers should explore advantages and barriers for using interactive technology to access marginalized populations. Copyright © 2010 Elsevier Ireland Ltd. All rights reserved.

  10. On the Cutting Edge (of Torpor): Innovation and the Pace of Change in American Higher Education

    Science.gov (United States)

    Murray, Gordon

    2008-01-01

    This article considers the pace of innovation and technology adoption in higher education and suggests that the rate of change on 21st century campuses is remarkably similar to earlier centuries when it may have taken over 30 years to introduce "modern" inventions like the telescope, microscope, and barometer to students. The literature shows that…

  11. Allergen structures and biologic functions: the cutting edge of allergy research.

    Science.gov (United States)

    Pomés, Anna

    2008-09-01

    Studies of structure and function of allergens using state-of-the-art technologies have led to a better understanding of allergenicity, including aspects related to cross-reactivity, allergen nomenclature, and the identification of antigenic determinants. This information is being applied to the design and production of allergy vaccines, some of which already have proven efficacy and safety in clinical trials.

  12. A Field Trip to the Moon: Using Cutting-Edge Scientific Visualizations in Astronomy Education

    Science.gov (United States)

    Wyatt, Ryan; Connolly, R.

    2007-05-01

    Visualizations of 3-D models and astronomical data bring the Universe to life for audiences in an immediate and personal way. Computer-generated visuals can now depict space exploration and current astronomical discoveries with unprecedented fidelity, placing complex concepts within reach and communicating the excitement of discovery and exploration to a wide range of ages. Since 1998, the American Museum of Natural History (AMNH) has mapped three-dimensional data groups ranging in scale from the solar neighborhood to the large-scale structure of the Universe: this “Digital Universe” provides the foundation for much of our visualization work. With support from NASA’s Exploration Systems Mission Directorate (ESMD), AMNH and NASA’s Marshall Space Flight Center have utilized this technology to develop an experiential “journey” to the Moon for the immersive planetarium environment. We will present selected visualizations from A Field Trip to the Moon, as well as results from the evaluation research. We describe best-practice teaching strategies for using visualizations to support learning, including strategies to scaffold with authentic activities, use real-world observations, and to create opportunities for questioning and the reporting of findings. Visualizations add a new dimension to teaching and outreach. But more important than simply the presence of technology in the classroom is its implementation, and we will recommend methods for using visualizations effectively to support project-based learning and inquiry.

  13. ENERGY EFFICIENCY IN CUTTING PROCESS OF COMPONENT BILLET SURFACE ON ANALYSIS BASIS FOR ENERGY-CONSUMPTION INDICES OF TECHNOLOGICAL EQUIPMENT

    Directory of Open Access Journals (Sweden)

    V. Adamenko

    2012-01-01

    Full Text Available The paper contains investigation results and proposes a method for calculation of optimum cutting rate. The method takes into account energy-consumption indices of technological equipment that permits to improve technological energy efficiency of cutting process.

  14. Liquid nitrogen-cooled diamond-wire concrete cutting. Innovative technology summary report

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    1998-12-01

    Liquid nitrogen-cooled diamond-wire concrete cutting can be used to cut through thick concrete walls, floors, and structures without using water to cool the cutting wire. The diamond wire is cooled with liquid nitrogen in a 0.9-m (3-ft) long by 7.6-cm (3-in.) diameter pipe housing. The nitrogen evaporates, so no contaminated liquid waste is generated. Other than the use of liquid nitrogen, the system is a conventional diamond-wire saw assembly with remote hydraulic controls. Setup of the hydraulic-powered drive wheel and the diamond wire for cutting requires a relatively short period of time using people with minimal training. Concrete dust generated during the cutting is considerable and requires control. The production rate of this improved technology is 0.78 m{sup 2}/hr (8.4 ft{sup 2}/hr). The production rates of traditional (baseline) water-cooled diamond-wire cutting and circular saw cutting technologies are 1.11 m{sup 2}/hr (12 ft{sup 2}/hr), and 0.45 m{sup 2}/hr (4.8 ft{sup 2}/hr), respectively. The liquid nitrogen-cooled system costs 189% more than conventional diamond-wire cutting if contaminated liquid wastes collection, treatment, and disposal are not accounted for with the baseline. The new technology was 310% more costly than a conventional diamond circular saw, under the conditions of this demonstration (no wastewater control). For cutting a 0.9-m x 3.7-m (3-ft x 12-ft) wall, the improved technology costs $17,000, while baseline diamond-wire cutting would cost $9,000 and baseline circular-saw cutting would cost $5,500. The improved system may cost less than the baseline technologies or may be comparable in cost if wastewater control is included.

  15. Application of gas-fluid atomization technology in ultrosonic vibration cutting titanium alloy workpiece

    Science.gov (United States)

    Zhou, Zhimin; Zhang, Yuangliang; Li, Xiaoyan; Sun, Baoyuan

    2009-11-01

    To further improve machined surface quality of diamond cutting titanium workpiece and reduce diamond tool wear, it puts forward a kind of machining technology with mixture of carbon dioxide gas, water and vegetable oil atomized mist as cooling media in the paper. The cooling media is sprayed to cutting area through gas-liquid atomizer device to achieve purpose of cooling, lubricating, and protecting diamond tool. Experiments indicate that carbon dioxide gas can touch cutting surface more adequately through using gas-liquid atomization technology, which makes iron atoms of cutting surface cause a chemical reaction directly with carbon in carbon dioxide gas and reduce graphitizing degree of diamond tool. Thus, this technology of using gas-liquid atomization and ultrasonic vibration together for cutting Titanium Alloy is able to improve machined surface quality of workpiece and slow of diamond tool wear.

  16. Restriction enzyme cutting site distribution regularity for DNA looping technology.

    Science.gov (United States)

    Shang, Ying; Zhang, Nan; Zhu, Pengyu; Luo, Yunbo; Huang, Kunlun; Tian, Wenying; Xu, Wentao

    2014-01-25

    The restriction enzyme cutting site distribution regularity and looping conditions were studied systematically. We obtained the restriction enzyme cutting site distributions of 13 commonly used restriction enzymes in 5 model organism genomes through two novel self-compiled software programs. All of the average distances between two adjacent restriction sites fell sharply with increasing statistic intervals, and most fragments were 0-499 bp. A shorter DNA fragment resulted in a lower looping rate, which was also directly proportional to the DNA concentration. When the length was more than 500 bp, the concentration did not affect the looping rate. Therefore, the best known fragment length was longer than 500 bp, and did not contain the restriction enzyme cutting sites which would be used for digestion. In order to make the looping efficiencies reach nearly 100%, 4-5 single cohesive end systems were recommended to digest the genome separately.

  17. Stepwise cutting edge design and application example of stamping parts%冲压件分段冲切刃口设计及应用实例

    Institute of Scientific and Technical Information of China (English)

    于位灵

    2012-01-01

    在分析、归纳级进冲压工艺中冲压件的分段冲切刃口设计原则的基础上,通过生产实践,对冲压件分段冲切刃口的连接方法进行了补充和完善.并通过分析典型实例,进一步说明如何合理地进行复杂轮廓分段、分段冲切顺序和冲切刃口断面设计.文中论述的设计原则,对冲压件分段冲切的工艺及其模具设计具有较好的实用参考价值.%Based on the analysis and induction of stepwise cutting edge design principles in stamping process, the step-wise cutting edge connection methods were added and perfected by means of production practice. And through the analysis of typical example, how to segment complex contour, design stepwise cutting sequence and edge section reasonably were showed The design principles, stepwise cutting edge process and die design of stamping parts discussed in this paper have a good practical reference value.

  18. ATLAS and CMS Virtual Visits: Bringing Cutting Edge Science into the Classroom and Beyond

    CERN Document Server

    Lapka, Marzena; Aguirre, Lucie; Hill, Ewan; Bourdarios, Claire; Beni, Noemi; Hochkeppel, Stephan Michael; Petrilli, Achille; Szillasi, Zoltan; Alexopoulos, Angelos

    2015-01-01

    Advances in information and communications technologies (ICTs) have given rise to innovative uses of web-based video tools for global communication, enhancing the impact of large research facilities, including their outreach and education programmes. As an example, the Virtual Visits programmes developed by the ATLAS and CMS collaborations at CERN, use videoconferencing to communicate with schools and remote events around the globe. The goal of these programmes is to enable the public, especially young people, to become engaged in and understand the field of particle physics through direct dialogue between ATLAS/CMS scientists and remote audiences. ATLAS and CMS collaborations enhanced the Virtual Visits concept in different ways, but still with the same objective, which is to break down geographical barriers and allow more people to enter the world of science, physics and particle physics. This supports local education and outreach activities. Both collaborations have hosted Virtual Visits for thousands of p...

  19. Bringing students to the mountain: developing partnerships to introduce students to cutting-edge research

    Science.gov (United States)

    Gillian-Daniel, Anne Lynn; Gordon, Robert J.; Taylor, Benjamin L.; McCarthy, Jon J.

    2013-05-01

    Many materials science education and outreach activities are designed to be easy and cost-effective to implement in K- 12 classrooms. While these activities are extremely effective at teaching broad materials science concepts such as size and scale, materials properties, and the use of tools in science, they do not connect very closely to the work being done in materials science research laboratories. In an effort to more closely connect our outreach efforts to the work being done by our researchers, the University of Wisconsin-Madison's Materials Research Science and Engineering Center (UW-MRSEC) has developed a partnership with Hitachi High Technologies America, Inc. This partnership allows us to introduce public audiences to a state-of-the-art tabletop scanning electron microscope (SEM) that is being used by UW researchers. In this paper, we describe the partnership including the use of the SEM in our Research Experience for Teachers (RET) program and in our community outreach programs.

  20. Dry Machining Aeronautical Aluminum Alloy AA2024-T351: Analysis of Cutting Forces, Chip Segmentation and Built-Up Edge Formation

    Directory of Open Access Journals (Sweden)

    Badis Haddag

    2016-08-01

    Full Text Available In this paper, machining aeronautical aluminum alloy AA2024-T351 in dry conditions was investigated. Cutting forces, chip segmentation, and built-up edge formation were analyzed. Machining tests revealed that the chip formation process depends on cutting conditions and tool geometry. So continuous and segmented chips are generated. Under some cutting conditions, built-up edge formation occurs. A predictive machining theory, based on a finite elements method (FEM, was applied to reproduce and explain these phenomena. Thermomechanical behaviors of the work material and the tool-work material interface were considered. Results of the proposed modelling were compared to experimental data for a wide range of cutting speed. It was shown that the feed force is well reproduced by the ALE-FE (arbitrary lagrangian-eulerian finite element formulation and highly underestimated by the lagrangian finite element (LAG-FE one. While, the periodic localized shear band, leading to a chip segmentation, is well reproduced with the Lagrangian FE formulation. It was found that the chip segmentation can be correlated to the cutting force evolution using the defined chip segmentation intensity parameter. For the built-up edge (BUE phenomenon, it was shown that it depends on the contact/friction at the tool-chip interface, and this is possible to simulate by making the friction coefficient time-dependent.

  1. Creating a standardized and simplified cutting bill using group technology

    Science.gov (United States)

    Urs Buehlmann; Janice K. Wiedenbeck; R., Jr. Noble; D. Earl Kline

    2008-01-01

    From an analytical viewpoint, the relationship between rough mill cutting bill part requirements and lumber yield is highly complex. Part requirements can have almost any length, width, and quantity distribution within the boundaries set by physical limitations, such as maximum length and width of parts. This complexity makes it difficult to understand the specific...

  2. Development of Advanced High Lift Leading Edge Technology for Laminar Flow Wings

    Science.gov (United States)

    Bright, Michelle M.; Korntheuer, Andrea; Komadina, Steve; Lin, John C.

    2013-01-01

    This paper describes the Advanced High Lift Leading Edge (AHLLE) task performed by Northrop Grumman Systems Corporation, Aerospace Systems (NGAS) for the NASA Subsonic Fixed Wing project in an effort to develop enabling high-lift technology for laminar flow wings. Based on a known laminar cruise airfoil that incorporated an NGAS-developed integrated slot design, this effort involved using Computational Fluid Dynamics (CFD) analysis and quality function deployment (QFD) analysis on several leading edge concepts, and subsequently down-selected to two blown leading-edge concepts for testing. A 7-foot-span AHLLE airfoil model was designed and fabricated at NGAS and then tested at the NGAS 7 x 10 Low Speed Wind Tunnel in Hawthorne, CA. The model configurations tested included: baseline, deflected trailing edge, blown deflected trailing edge, blown leading edge, morphed leading edge, and blown/morphed leading edge. A successful demonstration of high lift leading edge technology was achieved, and the target goals for improved lift were exceeded by 30% with a maximum section lift coefficient (Cl) of 5.2. Maximum incremental section lift coefficients ( Cl) of 3.5 and 3.1 were achieved for a blown drooped (morphed) leading edge concept and a non-drooped leading edge blowing concept, respectively. The most effective AHLLE design yielded an estimated 94% lift improvement over the conventional high lift Krueger flap configurations while providing laminar flow capability on the cruise configuration.

  3. The Role Dafachronic Acid Signaling in Development and Longevity in Caenorhabditis elegans: Digging Deeper Using Cutting Edge Analytical Chemistry

    Directory of Open Access Journals (Sweden)

    Hugo eAguilaniu

    2016-02-01

    Full Text Available Steroid hormones regulate physiological processes in species ranging from plants to humans. A wide range of steroid hormones exist, and their contributions to processes such as growth, reproduction, development, and aging, is almost always complex. Understanding the biosynthetic pathways that generate steroid hormones and the signaling pathways that mediate their effects is thus of fundamental importance. In this work, we review recent advances in (i the biological role of steroid hormones in the roundworm Caenorhabditis elegans and (ii the development of novel methods to facilitate the detection and identification of these molecules. Our current understanding of steroid signaling in this simple organism serves to illustrate the challenges we face moving forward. First, it seems clear that we have not yet identified all of the enzymes responsible for steroid biosynthesis and/or degradation. Second, perturbation of steroid signaling affects a wide range of phenotypes, and subtly different steroid molecules can have distinct effects. Finally, steroid hormone levels are critically important, and minute variations in quantity can profoundly impact a phenotype. Thus, it is imperative that we develop innovative analytical tools and combine them with cutting-edge approaches such as comprehensive and highly selective liquid chromatography coupled to mass spectrometry (LC-MS based or new methods such as supercritical fluid chromatography coupled to mass spectrometry (SFC-MS if we are to obtain a better understanding of the biological functions of steroid signaling.

  4. CERN Library | Arthur I. Miller presents "Colliding worlds: How Cutting-Edge Science Is Redefining Contemporary Art" | 21 October

    CERN Multimedia

    2014-01-01

    In recent decades, an exciting new art movement has emerged in which artists illuminate the latest advances in science.   Some of their provocative creations - a live rabbit implanted with the fluorescent gene of a jellyfish, a gigantic glass-and-chrome sculpture of the Big Bang itself - can be seen in traditional art museums and magazines, while others are being made by leading designers at Pixar, Google's Creative Lab and the MIT Media Lab. Arthur I. Miller takes readers on a wild journey to explore this new frontier. From the movement's origins a century ago - when Einstein shaped Cubism and X-rays affected fine photography - to the latest discoveries of biotechnology, cosmology and quantum physics, Miller shows how today's artists and designers are producing work at the cutting edge of science. Tuesday, 21 October 2014 at 14:30 in the Library, Bldg. 52 1-052 https://indico.cern.ch/event/346299/ *Coffee will be served from 2 p.m.* "Colliding Worlds: How Cutt...

  5. Piezoelectric polymer gated OFET: Cutting-edge electro-mechanical transducer for organic MEMS-based sensors

    Science.gov (United States)

    Thuau, Damien; Abbas, Mamatimin; Wantz, Guillaume; Hirsch, Lionel; Dufour, Isabelle; Ayela, Cédric

    2016-12-01

    The growth of micro electro-mechanical system (MEMS) based sensors on the electronic market is forecast to be invigorated soon by the development of a new branch of MEMS-based sensors made of organic materials. Organic MEMS have the potential to revolutionize sensor products due to their light weight, low-cost and mechanical flexibility. However, their sensitivity and stability in comparison to inorganic MEMS-based sensors have been the major concerns. In the present work, an organic MEMS sensor with a cutting-edge electro-mechanical transducer based on an active organic field effect transistor (OFET) has been demonstrated. Using poly(vinylidenefluoride/trifluoroethylene) (P(VDF-TrFE)) piezoelectric polymer as active gate dielectric in the transistor mounted on a polymeric micro-cantilever, unique electro-mechanical properties were observed. Such an advanced scheme enables highly efficient integrated electro-mechanical transduction for physical and chemical sensing applications. Record relative sensitivity over 600 in the low strain regime (organic MEMS-based sensors.

  6. Cutting edge proteomics

    DEFF Research Database (Denmark)

    Bunkenborg, Jakob; Espadas, Guadalupe; Molina, Henrik

    2013-01-01

    expensive bovine trypsin, the trypsins were equally specific. The semitryptic activity led to a better sequence coverage for abundant substrates at the expense of low-abundance species. The label-free analysis was shown to be more sensitive to unique features from the individual digests that were lost...

  7. Cutting Edge Exercises

    Institute of Scientific and Technical Information of China (English)

    LIU FENG'AN

    2010-01-01

    @@ On August 24, a fleet of three guided missile destroyers and several missile-carrying speedboats darted into the South China Sea. They were on the way to a military exercise in "attack and anti-attack maritime maneuvering formations and surface ship formations." The exercise was a component in a military campaign coded "Sword-2010."

  8. Cutting Edge Exercises

    Institute of Scientific and Technical Information of China (English)

    2010-01-01

    On August 24, a fleet of three guided missile destroyers and several missile-carrying speed-boats darted into the South China Sea. They were on the way to a military exercise in "attack and anti-attack maritime maneuvering formations

  9. Development of smart blade technology - trailing edge flaps

    DEFF Research Database (Denmark)

    Aagaard Madsen, Helge

    2014-01-01

    With blade lengths presently up to 80+ m there is a need for a supplement to the standard pitch system for control of power and loads. Distributed load control along the blade span with trailing edge flaps is a promising concept where numerical simulations have shown considerable load alleviation...

  10. Getting Started in Academic Careers: On the Cutting Edge Resources for Graduate Students, Postdoctoral Fellows, and Early Career Faculty

    Science.gov (United States)

    MacDonald, R.; Ormand, C.; Manduca, C. A.; Wright-Dunbar, R.; Allen-King, R.

    2007-12-01

    The professional development program,'On the Cutting Edge', offers on-line resources and annual multi-day workshops for graduate students and post-doctoral fellows interested in pursuing academic careers. Pre- workshop surveys reveal that early career faculty, post-docs, and graduate students have many questions about teaching (e.g., what are effective teaching strategies, how to design a course, how to prepare a syllabus, how to teach large courses), research (e.g., initiate and fund future research, set up and manage a lab, obtain equipment), and career management (e.g., understand tenure requirements, balance all it all). The graduate students and post-docs also have questions about jobs and the job search process. Their questions show a lack of familiarity with the nature of academic positions at different kinds of educational institutions (two-year colleges, primarily undergraduate institutions, and research universities). In particular, they are uncertain about what educational setting will best fit their values and career goals and how teaching loads and research expectations vary by institution. Common questions related to the job search process include where to find job listings (the most common question in recent years), when to start the job search process, how to stand out as an applicant, and how to prepare for interviews. Both groups have questions about how to develop new skills: how to develop, plan and prepare a new course (without it taking all of their time), how to expand beyond their PhD (or postdoc) research projects, how to develop a research plan, and where to apply for funding. These are important topics for advisors to discuss with all of their students and postdocs who are planning on careers in academia. On the Cutting Edge offers workshops and web resources to help current and future faculty navigate these critical stages of their careers. The four-day workshop for Early Career Geoscience Faculty: Teaching, Research, and Managing Your

  11. Less pollution - less raw materials - less noise: Automatic cylinder cut-off technology

    Energy Technology Data Exchange (ETDEWEB)

    1987-01-01

    VW's automatic cylinder cut-off technology displays its advantages especially in city traffic - as road tests have proved. Though no fuel saving was measured on motorways it came up to 16% when driving on country roads and 30% in inner city traffic. One intends to use cylinder cut-off first for diesel cars as the restart reliability of diesel engines is much higher than that of petrol engines. (HW)

  12. Modelling and Optimization of Technological Process for Magnetron Synthesis of Altin Nanocomposite Films on Cutting Tools

    Science.gov (United States)

    Kozhina, T. D.

    2016-04-01

    The paper highlights the results of the research on developing the mechanism to model the technological process for magnetron synthesis of nanocomposite films on cutting tools, which provides their specified physical and mechanical characteristics by controlling pulsed plasma parameters. The paper presents optimal conditions for AlTiN coating deposition on cutting tools according to the ion energy of sputtered atoms in order to provide their specified physical and mechanical characteristics.

  13. Laser cutting of graphite anodes for automotive lithium-ion secondary batteries: investigations in the edge geometry and heat-affected zone

    Science.gov (United States)

    Schmieder, Benjamin

    2012-03-01

    To serve the high need of lithium-ion secondary batteries of the automobile industry in the next ten years it is necessary to establish highly reliable, fast and non abrasive machining processes. In previous works [1] it was shown that high cutting speeds with several meters per second are achievable. For this, mainly high power single mode fibre lasers with up to several kilo watts were used. Since lithium-ion batteries are very fragile electro chemical systems, the cutting speed is not the only thing important. To guarantee a high cycling stability and a long calendrical life time the edge quality and the heat affected zone (HAZ) are equally important. Therefore, this paper tries to establish an analytical model for the geometry of the cutting edge based on the ablation thresholds of the different materials. It also deals with the composition of the HAZ in dependence of the pulse length, generated by laser remote cutting with pulsed fibre laser. The characterisation of the HAZ was done by optical microscopy, SEM, EDX and Raman microscopy.

  14. 周长为4不含3圈的m限制边连通图%m-Restricted Edge Cut of Graphs with 4 Circumference and 3 Free

    Institute of Scientific and Technical Information of China (English)

    朱铁丹; 王经雨

    2011-01-01

    m-restricted edge cut is a edge cut of graphs, it separates this graph into components each having order at least m. The paper characterize m-restricted edge cut of graphs with 4 circumference and 3 free.%m限制边割是连通图的一个边割,它将此图分离成阶不小于m的连通分支.刻画了周长为4,不含3圈的m限制边割的图类.

  15. On the Cutting Edge: Face-to-Face and Virtual Professional Development for Current and Future Geoscience Faculty

    Science.gov (United States)

    Macdonald, H.; Manduca, C. A.; Mogk, D. W.; Tewksbury, B. J.; Iverson, E. A.; Kirk, K. B.; Beane, R. J.; McConnell, D.; Wiese, K.; Wysession, M. E.

    2011-12-01

    On the Cutting Edge, a comprehensive, discipline-wide professional development program for current and future geoscience faculty, aims to develop a geoscience professoriate committed to high-quality instruction based on currency in scientific knowledge, good pedagogic practice, and research on learning. Our program provides an integrated workshop series and online teaching resources. Since 2002, we have offered more than 80 face-to-face workshops, virtual workshops and webinars, and hybrid events. Participants come from two-year colleges and four-year colleges and universities. The workshop series is designed to address the needs of faculty in all career stages at the full spectrum of institutions and covering the breadth of the geoscience curriculum. We select timely and compelling topics and create opportunities of interest to faculty. We offer workshops on course design, new geoscience research and pedagogical topics, core geoscience curriculum topics, and introductory courses as well as workshops for early career faculty and for future faculty. Our workshops are designed to model good teaching practice. We set workshop goals that guide workshop planning and evaluation. Workshops are interactive, emphasize participant learning, provide opportunities for participants to interact and share experience/knowledge, provide good resources, give participants time to reflect and to develop action plans, and help transform their ideas about teaching. We emphasize the importance of adaptation in the context of their specific situations. For virtual workshops and webinars we use icebreakers and other structured interactions to build a comfortable workshop community; promote interaction through features on webinar software, chat-aided question and answer, small-group synchronous interactions, and/or discussion boards; plan detailed schedules for workshop events; use asynchronous discussions and recordings of synchronous events given that participants are busy with their

  16. Impact of the REVEL Project: How Do Science Teachers Change by Doing Cutting-Edge Oceanographic Research?

    Science.gov (United States)

    Windschitl, M. A.; Robigou, V.

    2005-12-01

    high-tech, high-communication, fast-paced, collaborative, cutting-edge research on teachers' ability to transfer today's scientific process to students and how this might spark students' interest in science or improve their confidence or their reasoning skills are poorly understood.

  17. Device for cutting protrusions

    Science.gov (United States)

    Bzorgi, Fariborz M.

    2011-07-05

    An apparatus for clipping a protrusion of material is provided. The protrusion may, for example, be a bolt head, a nut, a rivet, a weld bead, or a temporary assembly alignment tab protruding from a substrate surface of assembled components. The apparatus typically includes a cleaver having a cleaving edge and a cutting blade having a cutting edge. Generally, a mounting structure configured to confine the cleaver and the cutting blade and permit a range of relative movement between the cleaving edge and the cutting edge is provided. Also typically included is a power device coupled to the cutting blade. The power device is configured to move the cutting edge toward the cleaving edge. In some embodiments the power device is activated by a momentary switch. A retraction device is also generally provided, where the retraction device is configured to move the cutting edge away from the cleaving edge.

  18. Edge pixel response studies of edgeless silicon sensor technology for pixellated imaging detectors

    Science.gov (United States)

    Maneuski, D.; Bates, R.; Blue, A.; Buttar, C.; Doonan, K.; Eklund, L.; Gimenez, E. N.; Hynds, D.; Kachkanov, S.; Kalliopuska, J.; McMullen, T.; O'Shea, V.; Tartoni, N.; Plackett, R.; Vahanen, S.; Wraight, K.

    2015-03-01

    Silicon sensor technologies with reduced dead area at the sensor's perimeter are under development at a number of institutes. Several fabrication methods for sensors which are sensitive close to the physical edge of the device are under investigation utilising techniques such as active-edges, passivated edges and current-terminating rings. Such technologies offer the goal of a seamlessly tiled detection surface with minimum dead space between the individual modules. In order to quantify the performance of different geometries and different bulk and implant types, characterisation of several sensors fabricated using active-edge technology were performed at the B16 beam line of the Diamond Light Source. The sensors were fabricated by VTT and bump-bonded to Timepix ROICs. They were 100 and 200 μ m thick sensors, with the last pixel-to-edge distance of either 50 or 100 μ m. The sensors were fabricated as either n-on-n or n-on-p type devices. Using 15 keV monochromatic X-rays with a beam spot of 2.5 μ m, the performance at the outer edge and corners pixels of the sensors was evaluated at three bias voltages. The results indicate a significant change in the charge collection properties between the edge and 5th (up to 275 μ m) from edge pixel for the 200 μ m thick n-on-n sensor. The edge pixel performance of the 100 μ m thick n-on-p sensors is affected only for the last two pixels (up to 110 μ m) subject to biasing conditions. Imaging characteristics of all sensor types investigated are stable over time and the non-uniformities can be minimised by flat-field corrections. The results from the synchrotron tests combined with lab measurements are presented along with an explanation of the observed effects.

  19. Technological study of laser cutting silicon steel controlled by rotating gas flow

    Science.gov (United States)

    Lei, Hong; Yi, Zhang; chenglong, Mi

    2009-04-01

    Using traditional laser cutting technology, it is easy to produce molten slag in laser cutting silicon steel sheet. The main reason is the inevitable oxidizing reaction in the process caused by the use of oxygen as the aided gas. As a common solution, high pressure and high purity N 2 or an inert gas is therefore used instead of oxygen. Although the cut quality is improved, the cutting efficiency is reduced because of the lack of energy generated from an exothermic oxidation reaction. The technology used in this paper is to employ a newly developed cyclone slag separator. The slag separator is located under the workpiece to form rotating gas flow for controlling the direction of the flowing slag gas. Adopting the new technology reported here, oxygen is still used as the aided gas. The experiments prove that, by controlling the technical parameters reasonably tightly, glossy and dross-free cutting kerfs are obtained for reduced laser power. The gas flow acting under the workpiece is simulated using the finite element method (FEM). The operating law of the rotating gas flow is verified by ANSYS, which provides an academic basis for controlling the flowing direction of the slag gas.

  20. Information Technology: A Tool to Cut Health Care Costs

    Science.gov (United States)

    Mukkamala, Ravi; Maly, K. J.; Overstreet, C. M.; Foudriat, E. C.

    1996-01-01

    Old Dominion University embarked on a project to see how current computer technology could be applied to reduce the cost and or to improve the efficiency of health care services. We designed and built a prototype for an integrated medical record system (MRS). The MRS is written in Tool control language/Tool kit (Tcl/Tk). While the initial version of the prototype had patient information hard coded into the system, later versions used an INGRES database for storing patient information. Currently, we have proposed an object-oriented model for implementing MRS. These projects involve developing information systems for physicians and medical researchers to enhance their ability for improved treatment at reduced costs. The move to computerized patient records is well underway, several standards exist for laboratory records, and several groups are working on standards for other portions of the patient record.

  1. Air Guard Unit Capitalizing on Leading-Edge Technology

    OpenAIRE

    Center for Homeland Defense and Security

    2012-01-01

    Center for Homeland Defense and Security, PRESS RELEASES When the California Air National Guard 129th Rescue Wing deploys next year to the Horn of Africa and Afghanistan, it plans to have a new, game-changing technology developed at the...

  2. Sustaining and Enhancing the US Militarys Technology Edge

    Science.gov (United States)

    2016-01-01

    acquisition-reform study written in the last several decades has em- phasized the importance of increasing performance measures and accountability ...military with a signifi- cant technological advantage , if not superiority, over its competitors and adversaries. The Department of Defense’s (DOD...been a distinct advantage that makes the US military the best in the world. But, the United States can no longer take for granted its decisive tech

  3. Maintaining the technological edge through local workforce collaboration

    Science.gov (United States)

    Finnegan, Martha M.; Haugen, Celine

    2003-03-01

    Napa County California has been a pioneer in Industry Cluster Analysis and has worked with a wide variety of industries to resolve identified needs with economical and achievable solutions. The Napa Workforce Investment Area has developed practical approaches to generate sustained interest from students and has incorporated this into its routine services thereby insuring a continuous supply of new practitioners and reducing costs to business. Career development, linking students directly with specific businesses and industries as well as tuition assistance have been provided to insure the continuation of a highly skilled workforce within the region. Letting industry set the agenda in problem solving forums has proved a valuable tool in resolving workforce retention and skill upgrade issues as well. A result of this collaborative effort has been the development of new curriculum and the opening of new Industry Schools to meet industry needs for training and retraining workers for new occupations within industries. In order to assist the various industries and individual businesses to meet changing technology and retention needs, Napa provides skill upgrade training to incumbent workers at no or reduced costs to businesses. Extending these practices to the field of Photo Optics is now a matter of formula.

  4. Machinery Cutting Technology of Ceramic Parts%陶瓷零件的机械切削加工

    Institute of Scientific and Technical Information of China (English)

    王强; 谢帆

    2013-01-01

    用数据包络分析法评价陶瓷的可加工性,构造数学规划模型,求出决策单元的最优解.结合陶瓷材料的机械加工难点,探讨了陶瓷车削、磨削、钻削等机械切削加工工艺的技术要点.通过切削正交试验,得到刀具的前角、后角、主偏角、副偏角、刃倾角、刀尖圆弧半径及切削速度、吃刀深度、进给量的参考值,优化加工工艺参数,达到较好的加工效果.%The machinability of ceramics is evaluated by data envelopment analysis, and mathematical programming model is constructed, then the optimal solution of decision-making unit is found. These reference values of the tool rake angle, clearance angle, tool cutting edge angle, minor cutting edge angle, tool cutting edge inclination angle, tip ARC radius and cutting speed, back engagement and the range of feeds are obtained through orthogonal cutting test, whose processing parameters are optimized, then better processing results are achieved. Considering the problem of machining of ceramic materials, the techniques of mechanical cutting process, ceramic turning, grinding, drilling, are discussed.

  5. Surface and cut-edge corrosion behavior of Zn-Mg-Al alloy-coated steel sheets as a function of the alloy coating microstructure

    Science.gov (United States)

    Oh, Min-Suk; Kim, Sang-Heon; Kim, Jong-Sang; Lee, Jae-Won; Shon, Je-Ha; Jin, Young-Sool

    2016-01-01

    The effects of Mg and Al content on the microstructure and corrosion resistance of hot-dip Zn-Mg-Al alloycoated steel sheets were investigated. Pure Zn and Zn-based alloy coatings containing Mg (0-5 wt%) and Al (0.2-55 wt%) were produced by a hot-dip galvanizing method. Mg and Al addition induced formation of intermetallic microstructures, like primary Zn, Zn/MgZn2 binary eutectic, dendric Zn/Al eutectoid, and Zn/Al/MgZn2/ternary eutectic structures in the coating layer. MgZn2-related structures (Zn/MgZn2, Zn/Al/MgZn2, MgZn2) played an important role in increasing the corrosion resistance of Zn-Mg-Al alloy-coated steel sheets. Zn-3%Mg-2.5%Al coating layer containing a large volume of lamellar-shaped Zn/MgZn2 binary eutectic structures showed the best cut-edge corrosion resistance. The analysis indicated that Mg dissolved from MgZn2 in the early stage of corrosion and migrated to the cathodic region of steel-exposed cut-edge area to form dense and ordered protective corrosion products, leading to prolonged cathodic protection of Zn-Mg-Al alloy-coated steel sheets.

  6. Diversity in sequences, post-translational modifications and expected pharmacological activities of toxins from four Conus species revealed by the combination of cutting-edge proteomics, transcriptomics and bioinformatics.

    Science.gov (United States)

    Degueldre, Michel; Verdenaud, Marion; Legarda, Garikoitz; Minambres, Rebeca; Zuniga, Sheila; Leblanc, Mathieu; Gilles, Nicolas; Ducancel, Frederic; De Pauw, Edwin; Quinton, Loic

    2017-05-01

    Venomous animals have developed a huge arsenal of reticulated peptides for defense and predation. Based on various scaffolds, they represent a colossal pharmacological diversity, making them top candidates for the development of innovative drugs. Instead of relying on the classical, low-throughput bioassay-guided approach to identify innovative bioactive peptides, this work exploits a recent paradigm to access to venom diversity. This strategy bypasses the classical approach by combining high-throughput transcriptomics, proteomics and bioinformatics cutting-edge technologies to generate reliable peptide sequences. The strategy employed to generate hundreds of reliable sequences from Conus venoms is deeply described. The study led to the discovery of (i) conotoxins that belong to known pharmacological families targeting various GPCRs or ion-gated channels, and (ii) new families of conotoxins, never described to date. It also focusses on the diversity of genes, sequences, folds, and PTM's provided by such species. Copyright © 2017 Elsevier Ltd. All rights reserved.

  7. Intelligent textiles and clothing for ballistic and NBC protection technology at the cutting edge

    CERN Document Server

    Jayaraman, Sundaresan

    2012-01-01

    This volume describes the latest developments in protective clothing against nearly any kind of threat for both military and civilians. It deals with protection through the use of nanotechnology, interactive clothing and biotechnological processes. Factors such as comfort and ballistics are also considered in the book, and several practical examples are discussed. All papers are written by leading experts in their respective fields. Professionals and students alike will benefit from the knowledge and expertise imparted in these outstanding contributions.

  8. Frame and edge seal technology: A state of the art survey

    Science.gov (United States)

    Thyholt, Marit; Andresen, Inger; Hugdal, Berit; Aschehoug, Oeyvind

    1994-04-01

    In windows, the glazing is traditionally mounted in an operable or fixed frame, made of wood, metal (steel or aluminum), or PVC. The glazing component in solar collectors and solar walls is also typically mounted in a frame. The purpose of the frame is to protect the vulnerable edge of the glazing and give structural stability, which is especially important in operable windows. Sealed multipane glazings are almost exclusively fabricated with a metal (aluminum or galvanized steel) spacer bar along the edges. New advanced glazings will require new types of frame and edge seal products. As the insulation properties of the glazing itself reach a performance close to that of well-insulated opaque walls, the thermal bridging caused by the spacer bars and the frames will be unacceptable, even for wooden windows. The new glazings will also integrate other functions, which again will influence the design of the frames. There are already quite a few new technological developments in this field. New materials and products for the edge seal and the frame are being developed, and computer calculations gradually take over the manual analysis and laboratory testing of new products. The objective of this IEA Task 18 Case Study is to investigate the influence of the frame and glazing edge seal on the total U-value of a glazing system, to develop improved test and calculation methods, and to design, construct, and test low thermal loss frames for use in advanced glazing applications.

  9. Development and application of fiber laser cutting technology%光纤激光切割技术

    Institute of Scientific and Technical Information of China (English)

    沈海平; 陈欣; 陈阳

    2013-01-01

    The laser cutting technology has been widely applied in cutting industry due to its perfect cutting quality,high dimension accuracy and small heat influence area.The advantages of fiber laser cutting machine in technology,structure and cost are analyzed by the description of fiber laser cutting and comparison with carbon dioxide laser cutting technology.In addition,relatively faster cutting speed,higher conversion rate from electricity to laser and flexible manufacturing ability promote fiber laser cuter to be advanced equipment in cutting industry.The intensive research topic about fiber laser cutting is introduced.Lastly,the current challenges with fiber laser cutting technology such as body security and the limit for thick steel plate cutting are discussed.%激光切割质量好,尺寸精度高,热影响小,在切割行业应用越来越广泛.通过对光纤激光切割机的介绍及其与二氧化碳激光切割机的对比,分析了光纤激光切割机在未来切割行业中的技术优势、结构优势、成本优势.光纤激光具有切割薄板速度快、能量集中、电光转化率高、柔性加工等众多优点.同时指出了目前光纤激光切割技术存在的安全问题及厚板切割局限性问题,提出了当前的一些解决方案及研究热点,并展望了光纤激光切割技术的发展前景.

  10. The influence of the cutting density on the magnetic properties of non-oriented electrical steels cut through mechanical punching and water jet technologies

    Science.gov (United States)

    Paltanea, V.; Paltanea, G.; Gavrila, H.; Popovici, D.; Jiga, G.

    2017-02-01

    The use of high quality non-oriented electrical steel and of an innovative design for the magnetic cores of the electrical machines are very important, in order to minimize the value of the total energy losses. The energy losses are strongly influenced by the cutting technologies, and the producers of the electrical machines want to minimize the deterioration of the magnetic properties during the manufacturing process. The influence of the cutting density on the magnetic permeability and energy losses was analyzed and one can notice that these magnetic properties are strongly influenced by the cutting technologies. There were tested sheet samples of M400-50A and M700-50A industrial steel grades (thickness of 0.50 mm), cut through mechanical and water jet technologies. All samples have the length equal to 300 mm and the width of 30, 15, 10, 7.5 and 5 mm. The magnetic characterization was performed using a laboratory single strip tester, which can make measurements on samples with an area of 300 × 30 mm2. In order to have the standard width of 30 mm, there were put together side by side 2, 3, 4 and 6 pieces with different widths. The magnetic properties were analyzed at 1000 mT in the frequency range 10 ÷ 400 Hz. It was observed that the processing conditions must be controlled and optimized, in order to maintain a low deterioration of the magnetic properties of the non-oriented steels. In the case of water jet technology an increase of the cutting speed will be useful for the introduction of this method in the large scale manufacturing of the electrical machines.

  11. Effect of technological parameters and wood properties on cutting power in plane milling of juvenile poplar wood

    Directory of Open Access Journals (Sweden)

    Barcík Štefan

    2008-10-01

    Full Text Available This paper presents the results of experimental measurements aimed at observing the effect of technological parameters (cutting speed vc and feed speed vf , type of wood (juvenile wood and mature wood andwood species (aspen Populus tremula, L. and hybrid poplar Populus x Euramericana „Serotina“ on cutting power during plane milling of poplar wood. The results showed the reduction of cutting power with the decrease of cutting speed and feed speed. Lower cutting power was also measured in milling hybrid poplar than in milling aspen. The test also confirmed the effect of different anatomical and chemical structure of juvenile wood in relation to mature wood on different physical and mechanical properties of such wood and hence also on the cutting power in processing juvenile wood.

  12. EDGE TECHNOLOGIES IN IoT AND APPLICATION SCENARIO OF RFID BASED IoT

    OpenAIRE

    Dharam Gami *, Asst. Prof. Dhaval Nimavat, Asst. Prof. Shubham Sharma

    2016-01-01

    Internet of Things possesses the power to change the era. IoT will offer an advance connectivity between objects which will change the face of machine-to-machine communication. IoT will connect autonomous systems, devices and heterogeneous machines and make them communicate without human interactions. Many technologies will play significant role in IoT implementation. In this paper, we aim to describe the candidate of edge technologies in IoT and demonstrate how RFID based IoT system will loo...

  13. EDGE TECHNOLOGIES IN IoT AND APPLICATION SCENARIO OF RFID BASED IoT

    OpenAIRE

    Dharam Gami *, Asst. Prof. Dhaval Nimavat, Asst. Prof. Shubham Sharma

    2016-01-01

    Internet of Things possesses the power to change the era. IoT will offer an advance connectivity between objects which will change the face of machine-to-machine communication. IoT will connect autonomous systems, devices and heterogeneous machines and make them communicate without human interactions. Many technologies will play significant role in IoT implementation. In this paper, we aim to describe the candidate of edge technologies in IoT and demonstrate how RFID based IoT system will loo...

  14. An evaluation of alternative reactor vessel cutting technologies for the experimental boiling water reactor at Argonne National Laboratory

    Energy Technology Data Exchange (ETDEWEB)

    Boing, L.E.; Henley, D.R. (Argonne National Lab., IL (USA)); Manion, W.J.; Gordon, J.W. (Nuclear Energy Services, Inc., Danbury, CT (USA))

    1989-12-01

    Metal cutting techniques that can be used to segment the reactor pressure vessel of the Experimental Boiling Water Reactor (EBWR) at Argonne National Laboratory (ANL) have been evaluated by Nuclear Energy Services. Twelve cutting technologies are described in terms of their ability to perform the required task, their performance characteristics, environmental and radiological impacts, and cost and schedule considerations. Specific recommendations regarding which technology should ultimately be used by ANL are included. The selection of a cutting method was the responsibility of the decommissioning staff at ANL, who included a relative weighting of the parameters described in this document in their evaluation process. 73 refs., 26 figs., 69 tabs.

  15. Scribe–cleave–passivate (SCP) slim edge technology for silicon sensors

    Energy Technology Data Exchange (ETDEWEB)

    Fadeyev, V., E-mail: vf@scipp.ucsc.edu [Santa Cruz Institute for Particle Physics, University of California, Santa Cruz, CA 95064 (United States); Sadrozinski, H.F.-W.; Ely, S.; Wright, J.G. [Santa Cruz Institute for Particle Physics, University of California, Santa Cruz, CA 95064 (United States); Christophersen, M.; Phlips, B.F. [U.S. Naval Research Laboratory, Code 7654, 4555 Overlook Ave, SW Washington, DC 20375 (United States); Pellegrini, G. [Instituto de Microelectrónica de Barcelona, IMB-CNM-CSIC, Bellaterra, Barcelona (Spain); Grinstein, S. [Institut de Fisica d’Altes Energies (IFAE) and ICREA, 08193 Bellaterra, (Barcelona) (Spain); Dalla Betta, G.-F. [INFN and University of Trento, Via Sommarive, 14, 38123 Povo di Trento (Italy); Boscardin, M. [Fondazione Bruno Kessler (FBK-CMM), Via Sommarive, 18, 38123 Povo di Trento (Italy); Klingenberg, R.; Wittig, T. [Technische Universitaet Dortmund, Fakultaet Physik, Experimentelle Physik IV, D-44221 Dortmund (Germany); Macchiolo, A.; Weigell, P. [Max-Planck-Institut für Physik, Föhringer Ring 6, D-80805 München (Germany); Creanza, D. [Dipartimento di Fisica, INFN Sezione di Bari, 70126 Bari (Italy); Bates, R.; Blue, A.; Eklund, L.; Maneuski, D.; Stewart, G. [SUPA School of Physics and Astronomy, University of Glasgow, Kelvin Building, Glasgow G12 8QQ (United Kingdom); and others

    2013-12-11

    We are pursuing scribe–cleave–passivate (SCP) technology of making “slim edge” sensors. Such sensors have only a minimal amount of inactive peripheral region, which benefits construction of large-area tracker and imaging systems. Key application steps of this method are surface scribing, cleaving, and passivation of the resulting sidewall. We are working on developing both the technology and physical understanding of the processed devices performance. In this paper we begin by reviewing the manufacturing options of SCP technology. Then we show new results regarding the technology automation and device physics performance. The latter includes charge collection efficiency near the edge and radiation hardness study. We also report on the status of devices processed at the request of the RD50 collaborators.

  16. National Insect and Disease Risk Map (NIDRM)--cutting edge software for rapid insect and disease risk model development

    Science.gov (United States)

    Frank J. Krist

    2010-01-01

    The Forest Health Technology Enterprise Team (FHTET) of the U.S. Forest Service is leading an effort to produce the next version of the National Insect and Disease Risk Map (NIDRM) for targeted release in 2011. The goal of this effort is to update spatial depictions of risk of tree mortality based on: (1) newly derived 240-m geospatial information depicting the...

  17. TECHNOLOGY OF REVERSE-BLAST CORROSION CLEANING OF STEEL SHEETS PRIOR TO LASER CUTTING

    Directory of Open Access Journals (Sweden)

    A. N. Zguk

    2017-01-01

    Full Text Available Quality of surface cleaning against corrosion influences on efficiency in realization of a number of technological processes. While using bentonite clays in power fluid reverse-blast cleaning ensures formation of anticorrosion protective coating with light absorbing properties on the cleaned surface and prevents formation of the repeated corrosion. The paper presents results of the investigations pertaining to influence of reverse-blast cleaning parameters of steel sheets on quality of the cleaned surface prior to laser cutting. Processing conditions, applied compositions of power fluid and also properties of the protective film coatings on the cleaned surface have been given in the paper. The paper considers topography, morphology and chemical composition of the given coating while applying complex metal micrographic, X-ray diffraction and electronic and microscopic investigations. A complex of laser cutting (refer to gas lasers with output continuous capacity of 2.5/4.0 kW has been applied for experimental works to evaluate influence of the formed surface quality on efficiency of laser cutting process. Specimens having dimension 120×120 mm, made of steel Ст3пс, with thickness from 3 to 10 mm have been prepared for the experiments. An analysis has shown that the application of reverse-blast cleaning ensures higher speed in laser cutting by a mean of 10–20 %. The investigations have made it possible to determine optimum cleaning modes: distance from a nozzle to the surface to be cleaned, jet velocity, pressure. It has been revealed that after drying of the specimens processed by power fluid based on water with concentrations of bentonite clay and calcined soda a protective film coating with thickness of some 5–7 µm has been formed on the whole cleaned specimen surfaces. Chemical base of the coating has been formed by the elements which are included in the composition of bentonite clay being the basic component of the power fluid. 

  18. TECHNOLOGICAL ADVANCEMENT OF DEPOSIT WELDING AND GAS LASER CUTTING TO INCREASE THE EFFICIENCY OF THE BIMETALLIC TOOL PRODUCTION

    Directory of Open Access Journals (Sweden)

    Burlachenko Oleg Vasil’evich

    2017-08-01

    Full Text Available Deposit welding is the application of a layer of metal on the surface of a product using fusion welding. In this paper, we consider the method of improving the technology of gas laser cutting, which makes it possible to achieve a high productivity of manufacturing a bimetallic tool. The present paper is concerned with the advantages of gas laser cutting which allows to consider this particular process of separating materials as highly-productive, low-waste, and advanced method of removing allowances of weld-deposit high-speed steel on the working surfaces of bimetallic tool. Urgency of the use of deposit welding and gas laser cutting to improve the efficiency of production of bimetallic tool is shown. The comparative analysis of gas-laser cutting and other cutting methods is given according to the geometrical parameters of cutting and surface quality. Analysis of the results of experimental studies has confirmed the high technological attractiveness and economic efficiency of manufacturing composite structures of punches and matrices when applying deposit welding of cutting parts with high-speed steels. The cost of dimensional processing of the welded cutting part is reduced by 4 to 6 times, while the manufacturing time is reduced by 6 to 12 times.

  19. 建筑学前沿与窑洞建筑%Cutting Edge of Architecture and Cave Dwelling Architecture

    Institute of Scientific and Technical Information of China (English)

    刘亚栋; 赵西平; 阮丹

    2014-01-01

    This paper talked from the architect Wangshu who is widely recognized in contemporary China, talked about tra-ditional and ecological levels in “architectural meaning”, and then referred to the Northern Shaanxi cave. Through the discu-ssion of cave dwel ing, the author obtained that the low tech-nology strategy is a way to solve the ecological and environ-mental protection and energy consumption problem.%本文从当代中国广受认可的建筑师王澍谈起,谈到了“建筑意”中传统与生态的层面,进而提到了陕北窑洞。通过对窑洞的探讨,得出了低技策略是解决生态环保及能耗问题的一种方式。

  20. An Industry/Academe Consortium for Achieving 20% wind by 2030 through Cutting-Edge Research and Workforce Training

    Energy Technology Data Exchange (ETDEWEB)

    Sotiropoulos, Fotis [Univ. of Minnesota, Minneapolis, MN (United States); Marr, Jeffrey D.G. [Univ. of Minnesota, Minneapolis, MN (United States); Milliren, Christopher [Univ. of Minnesota, Minneapolis, MN (United States); Kaveh, Mos [Univ. of Minnesota, Minneapolis, MN (United States); Mohan, Ned [Univ. of Minnesota, Minneapolis, MN (United States); Stolarski, Henryk [Univ. of Minnesota, Minneapolis, MN (United States); Glauser, Mark [Univ. of Minnesota, Minneapolis, MN (United States); Arndt, Roger [Univ. of Minnesota, Minneapolis, MN (United States)

    2013-12-01

    In January 2010, the University of Minnesota, along with academic and industry project partners, began work on a four year project to establish new facilities and research in strategic areas of wind energy necessary to move the nation towards a goal of 20% wind energy by 2030. The project was funded by the U.S. Department of Energy with funds made available through the American Recovery and Reinvestment Act of 2009. $7.9M of funds were provided by DOE and $3.1M was provided through matching funds. The project was organized into three Project Areas. Project Area 1 focused on design and development of a utility scale wind energy research facility to support research and innovation. The project commissioned the Eolos Wind Research Field Station in November of 2011. The site, located 20 miles from St. Paul, MN operates a 2.5MW Clipper Liberty C-96 wind turbine, a 130-ft tall sensored meteorological tower and a robust sensor and data acquisition network. The site is operational and will continue to serve as a site for innovation in wind energy for the next 15 years. Project Areas 2 involved research on six distinct research projects critical to the 20% Wind Energy by 2030 goals. The research collaborations involved faculty from two universities, over nine industry partners and two national laboratories. Research outcomes include new knowledge, patents, journal articles, technology advancements, new computational models and establishment of new collaborative relationships between university and industry. Project Area 3 focused on developing educational opportunities in wind energy for engineering and science students. The primary outcome is establishment of a new graduate level course at the University of Minnesota called Wind Engineering Essentials. The seminar style course provides a comprehensive analysis of wind energy technology, economics, and operation. The course is highly successful and will continue to be offered at the University. The vision of U.S. DOE to

  1. Astronomy with Cutting-Edge ICT: From Transients in the Sky to Data over the Continents (India-US)

    CERN Document Server

    Mahabal, Ashish; Williams, Roy; Navelkar, Sharmad

    2012-01-01

    Astronomy has always been at the forefront of information technology, moving from the era of photographic plates, to digital snapshots and now to digital movies of the sky. This has brought about a data explosion with multi- terabyte surveys already happening and upcoming petabyte scale surveys. By scanning the sky repeatedly and automatically, astronomers find rapidly changing phenomena - transients - of a great variety. Surveys like the Catalina Real-time Transient Survey (CRTS) publish details on the transients right away since many of these fade in a matter of minutes and it is important to get additional observations in order to determine their nature. This involves being able to combine a variety of datasets, small and large, in real-time. With networks like the Asia Pacific Advanced Network (APAN) and India's National Knowledge Network (NKN) we are in the realm where such a data transfer is possible in real time across continents. Here we describe the live demonstration we were able to carry out at dat...

  2. Utilizing semantic Wiki technology for intelligence analysis at the tactical edge

    Science.gov (United States)

    Little, Eric

    2014-05-01

    Challenges exist for intelligence analysts to efficiently and accurately process large amounts of data collected from a myriad of available data sources. These challenges are even more evident for analysts who must operate within small military units at the tactical edge. In such environments, decisions must be made quickly without guaranteed access to the kinds of large-scale data sources available to analysts working at intelligence agencies. Improved technologies must be provided to analysts at the tactical edge to make informed, reliable decisions, since this is often a critical collection point for important intelligence data. To aid tactical edge users, new types of intelligent, automated technology interfaces are required to allow them to rapidly explore information associated with the intersection of hard and soft data fusion, such as multi-INT signals, semantic models, social network data, and natural language processing of text. Abilities to fuse these types of data is paramount to providing decision superiority. For these types of applications, we have developed BLADE. BLADE allows users to dynamically add, delete and link data via a semantic wiki, allowing for improved interaction between different users. Analysts can see information updates in near-real-time due to a common underlying set of semantic models operating within a triple store that allows for updates on related data points from independent users tracking different items (persons, events, locations, organizations, etc.). The wiki can capture pictures, videos and related information. New information added directly to pages is automatically updated in the triple store and its provenance and pedigree is tracked over time, making that data more trustworthy and easily integrated with other users' pages.

  3. The risk for immediate postoperative complications after pancreaticoduodenectomy is increased by high frequency of acinar cells and decreased by prevalent fibrosis of the cut edge of pancreas.

    Science.gov (United States)

    Laaninen, Matias; Bläuer, Merja; Vasama, Kaija; Jin, Haitao; Räty, Sari; Sand, Juhani; Nordback, Isto; Laukkarinen, Johanna

    2012-08-01

    Soft pancreas is considered as a factor for pancreatitis after pancreaticoduodenectomy, which in turn constitutes a high risk for local complications. The aim was to analyze the proportion of different cell types in the cut edge of pancreas (CEP) in relation to postoperative pancreatitis and other complications after pancreaticoduodenectomy. Data from postoperative follow-up was collected on 40 patients who had undergone pancreaticoduodenectomy. Positive urine trypsinogen-2, an early detector of pancreatitis, was checked on days 1 to 6 after operation. Drain amylase was measured on postoperative day 3. Anastomotic leakages, delayed gastric emptying, and other complications were registered. The areas of different cell types were calculated from the entire hematoxylin-eosin-stained section of CEP. High frequency of acinar cells in the CEP significantly increased positive urine trypsinogen-2 days, drain amylase values, and delayed gastric emptying. In a subgroup of patients with more than 40% acini in the CEP, there were significantly more postoperative complications. Increased fibrosis correlated with a small number of positive urine trypsinogen-2 days and postoperative complications. A large number of acinar cells in the CEP increases, whereas extensive fibrosis in the CEP decreases, the risk for postoperative complications after pancreaticoduodenectomy. These results emphasize the importance of acini in the development of postoperative complications.

  4. The Role of Dafachronic Acid Signaling in Development and Longevity in Caenorhabditis elegans: Digging Deeper Using Cutting-Edge Analytical Chemistry.

    Science.gov (United States)

    Aguilaniu, Hugo; Fabrizio, Paola; Witting, Michael

    2016-01-01

    Steroid hormones regulate physiological processes in species ranging from plants to humans. A wide range of steroid hormones exist, and their contributions to processes, such as growth, reproduction, development, and aging, is almost always complex. Understanding the biosynthetic pathways that generate steroid hormones and the signaling pathways that mediate their effects is thus of fundamental importance. In this work, we review recent advances in (i) the biological role of steroid hormones in the roundworm Caenorhabditis elegans and (ii) the development of novel methods to facilitate the detection and identification of these molecules. Our current understanding of steroid signaling in this simple organism serves to illustrate the challenges we face moving forward. First, it seems clear that we have not yet identified all of the enzymes responsible for steroid biosynthesis and/or degradation. Second, perturbation of steroid signaling affects a wide range of phenotypes, and subtly different steroid molecules can have distinct effects. Finally, steroid hormone levels are critically important, and minute variations in quantity can profoundly impact a phenotype. Thus, it is imperative that we develop innovative analytical tools and combine them with cutting-edge approaches including comprehensive and highly selective liquid chromatography coupled to mass spectrometry based on new methods such as supercritical fluid chromatography coupled to mass spectrometry (SFC-MS) if we are to obtain a better understanding of the biological functions of steroid signaling.

  5. Effect of powdered activated carbon technology on short-cut nitrogen removal for coal gasification wastewater.

    Science.gov (United States)

    Zhao, Qian; Han, Hongjun; Xu, Chunyan; Zhuang, Haifeng; Fang, Fang; Zhang, Linghan

    2013-08-01

    A combined process consisting of a powdered activated carbon technology (PACT) and short-cut biological nitrogen removal reactor (SBNR) was developed to enhance the removal efficiency of the total nitrogen (TN) from the effluent of an upflow anaerobic sludge bed (UASB) reactor, which was used to treat coal gasification wastewater (CGW). The SBNR performance was improved with the increasing of COD and TP removal efficiency via PACT. The average removal efficiencies of COD and TP in PACT were respectively 85.80% and 90.30%. Meanwhile, the NH3-N to NO2-N conversion rate was achieved 86.89% in SBNR and the total nitrogen (TN) removal efficiency was 75.54%. In contrast, the AOB in SBNR was significantly inhibited without PACT or with poor performance of PACT in advance, which rendered the removal of TN. Furthermore, PAC was demonstrated to remove some refractory compounds, which therefore improved the biodegradability of the coal gasification wastewater.

  6. Single Crystal Si Layers on Glass Fabricated by Hydrophilic Fusion Bonding and Smart-Cut Technology

    Institute of Scientific and Technical Information of China (English)

    ZHEN Wan-Bao; LIU Wei-Li; SONG Zhi-Tang; FENG Song-Lin; ZHU Shi-Fu; ZHAO Bei-Jun

    2004-01-01

    @@ A single crystal Si thin film on a glass substrate has been obtained successfully by hydrophilic fusion bonding and the smart-cut technology. Tensile strength testing shows that the bonded interface has strong adhesion and the bonding strength is about 8.7 MPa. Crystallinity and microstructure of the samples have been characterized by transmission electron microscopy (TEM). Electrical properties have also been investigated by Hall measurements and four-point probe. The mobility of the transferred Si layer on glass is about 122cm2/V.s. The results show that the single-crystal silicon layer transferred onto glass by direct bonding keeps good quality for the applications of integrated circuits, transducers, and flat panel display.

  7. On the Research Progress of Laser Cutting Technology%激光切割技术的研究进展

    Institute of Scientific and Technical Information of China (English)

    郭华锋; 李菊丽; 孙涛

    2015-01-01

    In response to the hot issues involved in the laser cutting technology research such as the cutting system innovation ,cutting process simulation ,cutting efficiency and quality control etc .,this paper , on the basis of the principle and classification of laser cutting technology ,reviewed and analyzed the re‐search progress of the key generic technologies in such aspects as the laser cutting system ,the numerical simulation of temperature field/stress field ,the planning and optimization of cutting path ,and the predic‐tion and control of cutting quality .It also pointed out the current problems and the development trend in the future .%针对激光切割技术研究中的切割系统创新、切割过程数值模拟、切割效率提高及切割质量控制等方面的热点问题,从激光切割技术的原理和分类出发,综述了切割系统、温度场与应力场数值模拟、切割路径规划及优化、切割质量预测及控制等关键共性技术方面的研究进展,并加以分析与展望,指出了目前激光切割技术中存在的问题及未来发展趋势。

  8. The effect of cutting conditions on power inputs when machining

    Science.gov (United States)

    Petrushin, S. I.; Gruby, S. V.; Nosirsoda, Sh C.

    2016-08-01

    Any technological process involving modification of material properties or product form necessitates consumption of a certain power amount. When developing new technologies one should take into account the benefits of their implementation vs. arising power inputs. It is revealed that procedures of edge cutting machining are the most energy-efficient amongst the present day forming procedures such as physical and technical methods including electrochemical, electroerosion, ultrasound, and laser processing, rapid prototyping technologies etc, such as physical and technical methods including electrochemical, electroerosion, ultrasound, and laser processing, rapid prototyping technologies etc. An expanded formula for calculation of power inputs is deduced, which takes into consideration the mode of cutting together with the tip radius, the form of the replaceable multifaceted insert and its wear. Having taken as an example cutting of graphite iron by the assembled cutting tools with replaceable multifaceted inserts the authors point at better power efficiency of high feeding cutting in comparison with high-speed cutting.

  9. Cutting edge intermediate : student's book

    CERN Document Server

    Cunningham, Sarah

    2004-01-01

    A focus on high-frequency useful vocabulary helps students say what they want to say. Regular, well-structured speaking tasks encourage students to express themselves more extensively and fluently. ‘Do You Remember’ sections in every unit and extra. Consolidation modules provide regular review and consolidation Student Books include Mini-Dictionary to help learners study independently.

  10. Study on Treatment Technology of Drill Cuttings While Drilling%钻屑随钻处理技术研究

    Institute of Scientific and Technical Information of China (English)

    牟顺泉; 董怀荣; 丁希军; 安庆宝

    2012-01-01

    介绍了国内外钻屑处理技术现状,提出一种新型钻屑随钻处理实施方案,研制出了关键技术设备.现场试验结果表明:具有钻屑随钻处理功能的新型钻井液固控系统能够满足我国实际钻井工况要求,推广应用前景广阔.%Based on analyzing the domestic and international situation of treatment technology of drill cuttings, the kind of new technical scheme of treatment technology of drill cuttings while drilling was put forward,that the drilling technology of minor cycle without mud pit can be realized and the drill cuttings according with the conditions of transport through dewatering and drying can be carried away from drilling well site before falling onto ground. The key equipment was developed, which has been tried in lab and on site through 3 wells. The results showed that the new mud solid control system with treatment technology of drill cuttings while drilling had a good adaptability to meet the actual drilling condition in China. This technology has broad application prospects.

  11. 3D Measurement Technology by Structured Light Using Stripe-Edge-Based Gray Code

    Science.gov (United States)

    Wu, H. B.; Chen, Y.; Wu, M. Y.; Guan, C. R.; Yu, X. Y.

    2006-10-01

    The key problem of 3D vision measurement using triangle method based on structured light is to acquiring projecting angle of projecting light accurately. In order to acquire projecting angle thereby determine the corresponding relationship between sampling point and image point, method for encoding and decoding structured light based on stripe edge of Gray code is presented. The method encoded with Gray code stripe and decoded with stripe edge acquired by sub-pixel technology instead of pixel centre, so latter one-bit decoding error was removed. Accuracy of image sampling point location and correspondence between image sampling point and object sampling point achieved sub-pixel degree. In addition, measurement error caused by dividing projecting angle irregularly by even-width encoding stripe was analysed and corrected. Encoding and decoding principle and decoding equations were described. Finally, 3dsmax and Matlab software were used to simulate measurement system and reconstruct measured surface. Indicated by experimental results, measurement error is about 0.05%.

  12. Application of automatic edge-tracing function in CNC laser cutting machine%自动寻边功能在数控激光切割机上的应用

    Institute of Scientific and Technical Information of China (English)

    周亚丽; 邢振宏; 刘健; 靳兵花

    2013-01-01

    介绍了自动寻边功能在数控激光切割机加工大幅面、中厚板时的应用,阐述了该功能的原理及设计思路.该功能提高了生产效率及设备的自动化程度.%The application of automatic edge-tracing function in the CNC laser cutting machine for big-size and medium &thick plate has been introduced in the text. It improves the productivity and the automation degree of the CNC laser cutting machine.

  13. 先进CNC复合加工刀具和复合切削技术%Summarization of Advanced CNC Composite Cutting Tools and Composite Cutting Technology

    Institute of Scientific and Technical Information of China (English)

    张平亮

    2012-01-01

    The characteristics and application area of advanced CNC composite machining tools in Germany, Japan, Italy and other countries were introduced. The essential hardware, software and expected result of CNC composite cutting technology were expounded. Development of the new CNC composite processing technology in future was proposed.%介绍了德国、日本、意大利等国生产的先进的CNC复合加工刀具的特点与应用范围,阐明了CNC复合切削技术必要的硬软件及期望达到的效果,并提出今后CNC复合加工技术发展方向.

  14. Development of active edge pixel sensors and four-side buttable modules using vertical integration technologies

    CERN Document Server

    INSPIRE-00219560; Moser, H.-G.; Nisius, R.; Richter, R.H.; Terzo, S.; Weigell, P.

    2014-01-01

    We present an R&D activity focused on the development of novel modules for the upgrade of the ATLAS pixel system at the High Luminosity LHC (HL-LHC). The modules consist of n-in-p pixel sensors, 100 or 200 $\\mu$m thick, produced at VTT (Finland) with an active edge technology, which considerably reduces the dead area at the periphery of the device. The sensors are interconnected with solder bump-bonding to the ATLAS FE-I3 and FE-I4 read-out chips, and characterized with radioactive sources and beam tests at the CERN-SPS and DESY. The results of these measurements will be discussed for devices before and after irradiation up to a fluence of $5\\times 10^{15}$ \

  15. Outreach Aboard the JOIDES Resolution During IODP Exp. 360: Bringing Cutting Edge Research on Mid Ocean Ridge Processes to Classrooms Worldwide

    Science.gov (United States)

    Kavanagh, L.; Martinez, A. O.; Burgio, M.; Zhang, J.; Expedition 360 Scientists, I.

    2016-12-01

    In order to increase classroom engagement for the next generation of scientists, teachers must include current research in their curriculum. The JOIDES Resolution offers this opportunity to teachers worldwide. We recently served as four Education and Outreach Officers during Exp. 360: Southwest Indian Ridge Lower Crust and Moho. Our aim was to communicate the goals of the expedition to students and the general public through webcasts, social media, videos, and interviews. Prior to the expedition, I visited a number of schools in Texas and shared my upcoming experience with 800 teachers and students. Webcasts hosted during the expedition were tailored to the teacher's specifications of subject area and grade level. Students and teachers were able to witness cutting edge science during a tour of the ship and ask questions of those directly involved in the research. Lessons, resources, and videos featuring the scientific activities taking place and highlighting the workings of a research vessel were developed and will be featured at science teacher conferences at the state and national level. Upon my return home I visited schools that participated in webcasts and provided samples of peripheral rock material for instructional purposes. This expedition has also led to post cruise collaboration with some of the Expedition 360 scientists. My students will have the opportunity to do research with the microbiologists along the Rio Grande River and at Texas A&M University. Expedition 360 has opened up a multitude of opportunities for my students and those around the world that participated in the live webcasts. I was able to reach out to the same students multiple times during this experience which made it possible for them to connect with the science before, during, and after the expedition. These types of opportunities will inspire the next generation of scientists who will make advances towards new understandings of Earth's processes.

  16. Growth rate of mosses and their environmental determinants in subalpine coniferous forests and clear-cuts at the eastern edge of the Qinghai-Tibetan Plateau,China

    Institute of Scientific and Technical Information of China (English)

    2008-01-01

    Mosses cover most of the forest floor of subalpine forests at the eastern edge of the Qinghai-Tibetan Plateau,the origin of many important rivers in China.They play a crucial role in preventing soil erosion and conserving large amounts of water thereby regulating the water budget of local ecosystems.This area has a harsh climate due to low temperatures and low air pressure at high elevations.But the temperature varies considerably during the growing season,which does not favor the regeneration of spruce seedlings on clear-cuts after logging.Leaves of mosses have a single layer of cells and are thus sensitive to environmental changes.This attribute may be useful for monitoring environmental conditions and guide artificial regeneration.The growth of mosses has never been studied in this area and the variables indicating their growth in the subalpine forest ecosystems still needs investigation.Growth rates of mosses have been rarely studied worldwide because the methods are time consuming and often inaccurate.A more simple and accurate method for measuring moss growth would help and encourage relevant research.We have found a method that will promote the efficiency in field measurements.Because of the special growth properties of mosses,the apical cell of branches initiates growth and the preceding leaves will stay where they were as the tips grow.Once mosses are marked with red oil at the tip of branches surrounded by young leaves,that portion of the branch above the marked leaves represents growth after labeling.Two plots,one in an old-growth spruce forest and another in a nearby clear-cut,were selected to label mosses in a subalpine area of western Sichuan Province during the growing season in 2001.The labeling was done on May 7 and measurements were made on August 7.Microclimate measurements on both sites were simultaneously carried out.Of the six mosses,five species were present in both the forest and on the clear-cut.One species,Entodon conncinus,was found only

  17. Gasification advanced research and technology development (AR and TD) cross-cut meeting and review. [US DOE supported

    Energy Technology Data Exchange (ETDEWEB)

    1981-01-01

    The US Department of Energy gasification advanced research and technology development (AR and TD) cross-cut meeting and review was held June 24 to 26, 1981, at Germantown, Maryland. Forty-eight papers from the proceedings have been entered individually into EDB and ERA. (LTN)

  18. Cutting propagation technology of cycad plants%苏铁植物扦插繁殖育苗技术

    Institute of Scientific and Technical Information of China (English)

    伍群玉; 马书云; 杜万平

    2013-01-01

    从幼苗繁殖、移栽、管理等过程介绍了苏铁植物扦插繁殖育苗技术。%From seedling propagation, transplantation, management etc to introduce Cutting Propagation Technology of Cycad Plants.

  19. Effect of Moisture Content of Paper Material on Laser Cutting

    Science.gov (United States)

    Stepanov, Alexander; Saukkonen, Esa; Piili, Heidi; Salminen, Antti

    Laser technology has been used in industrial processes for several decades. The most advanced development and implementation took place in laser welding and cutting of metals in automotive and ship building industries. However, there is high potential to apply laser processing to other materials in various industrial fields. One of these potential fields could be paper industry to fulfill the demand for high quality, fast and reliable cutting technology. Difficulties in industrial application of laser cutting for paper industry are associated to lack of basic information, awareness of technology and its application possibilities. Nowadays possibilities of using laser cutting for paper materials are widened and high automation level of equipment has made this technology more interesting for manufacturing processes. Promising area of laser cutting application at paper making machines is longitudinal cutting of paper web (edge trimming). There are few locations at a paper making machine where edge trimming is usually done: wet press section, calender or rewinder. Paper web is characterized with different moisture content at different points of the paper making machine. The objective of this study was to investigate the effect of moisture content of paper material on laser cutting parameters. Effect of moisture content on cellulose fibers, laser absorption and energy needed for cutting is described as well. Laser cutting tests were carried out using CO2 laser.

  20. The edge-cutting role of scientific and technical information in promoting hydraulic scientific research%科技文献为水利科研服务的前沿作用

    Institute of Scientific and Technical Information of China (English)

    徐丽娟

    2000-01-01

    论述了科技文献为水利科研服务的前沿作用,提出科研信息服务工作应面向特色化、网络化。%The edge-cutting role of scientific and technical information in promoting hydraulic scientific research is discussed in this paper. It is concluded that the information service of scientific research must meet the challenges of net era.

  1. The Edge supersonic transport

    Science.gov (United States)

    Agosta, Roxana; Bilbija, Dushan; Deutsch, Marc; Gallant, David; Rose, Don; Shreve, Gene; Smario, David; Suffredini, Brian

    1992-01-01

    As intercontinental business and tourism volumes continue their rapid expansion, the need to reduce travel times becomes increasingly acute. The Edge Supersonic Transport Aircraft is designed to meet this demand by the year 2015. With a maximum range of 5750 nm, a payload of 294 passengers and a cruising speed of M = 2.4, The Edge will cut current international flight durations in half, while maintaining competitive first class, business class, and economy class comfort levels. Moreover, this transport will render a minimal impact upon the environment, and will meet all Federal Aviation Administration Part 36, Stage III noise requirements. The cornerstone of The Edge's superior flight performance is its aerodynamically efficient, dual-configuration design incorporating variable-geometry wingtips. This arrangement combines the benefits of a high aspect ratio wing at takeoff and low cruising speeds with the high performance of an arrow-wing in supersonic cruise. And while the structural weight concerns relating to swinging wingtips are substantial, The Edge looks to ever-advancing material technologies to further increase its viability. Heeding well the lessons of the past, The Edge design holds economic feasibility as its primary focus. Therefore, in addition to its inherently superior aerodynamic performance, The Edge uses a lightweight, largely windowless configuration, relying on a synthetic vision system for outside viewing by both pilot and passengers. Additionally, a fly-by-light flight control system is incorporated to address aircraft supersonic cruise instability. The Edge will be produced at an estimated volume of 400 aircraft and will be offered to airlines in 2015 at $167 million per transport (1992 dollars).

  2. Development of active edge pixel sensors and four-side buttable modules using vertical integration technologies

    Science.gov (United States)

    Macchiolo, A.; Andricek, L.; Moser, H.-G.; Nisius, R.; Richter, R. H.; Terzo, S.; Weigell, P.

    2014-11-01

    We present an R&D activity focused on the development of novel modules for the upgrade of the ATLAS pixel system at the High Luminosity LHC (HL-LHC). The modules consist of n-in-p pixel sensors, 100 or 200 μm thick, produced at VTT (Finland) with an active edge technology, which considerably reduces the dead area at the periphery of the device. The sensors are interconnected with solder bump-bonding to the ATLAS FE-I3 and FE-I4 read-out chips, and characterised with radioactive sources and beam tests at the CERN-SPS and DESY. The results of these measurements will be discussed for devices before and after irradiation up to a fluence of 5 ×1015neq /cm2. We will also report on the R&D activity to obtain Inter Chip Vias (ICVs) on the ATLAS read-out chip in collaboration with the Fraunhofer Institute EMFT. This step is meant to prove the feasibility of the signal transport to the newly created readout pads on the backside of the chips allowing for four side buttable devices without the presently used cantilever for wire bonding. The read-out chips with ICVs will be interconnected to thin pixel sensors, 75 μm and 150 μm thick, with the Solid Liquid Interdiffusion (SLID) technology, which is an alternative to the standard solder bump-bonding.

  3. Cut Front Geometry Characterization in Cutting Applications of Brass with Abrasive Water Jet

    Science.gov (United States)

    Akkurt, Adnan

    2010-06-01

    Abrasive water jet (AWJ) cutting is an advanced manufacturing process for machining hard to cut materials. In this study, brass-353 samples of different thicknesses were cut by AWJ using different feed rates to identify the relationships between depth of cut (material thickness), feed rate, and deflection of cutting edge geometry. The effects of material thickness on the AWJ cut surface roughness were investigated and discussed. Deflection of cutting edge geometry in AWJ cutting process was assessed. Cutting edge geometry was characterized by analyzing the surface properties of cut samples.

  4. C-105 heel pit removed and C-105 dome cut paves way for new retrieval technology

    Energy Technology Data Exchange (ETDEWEB)

    Mackey, Thomas C.; Sutey, Michael J.

    2013-06-10

    For just the second time, crews have cut a hole in the top of an active radioactive waste storage tank at Hanford. Workers began cutting a 55-inch hole in the top of Tank C-105 last Tuesday night on graveyard shift, completing the cut early Wednesday. The hole will allow for installation of the Mobile Arm Retrieval System (MARS) Vacuum into the tank. The cut was made through 17 inches of concrete and rebar using the newly developed rotary-core cutting system, which uses a laser-guided steel canister with teeth on the bottom to drill a round hole into the tank dome. The project was completed safely and successfully in a high-rad area without contamination or significant dose to workers.

  5. C-105 heel pit removed and C-105 dome cut paves way for new retrieval technology

    Energy Technology Data Exchange (ETDEWEB)

    Mackey, Thomas C.; Sutey, Michael J.

    2013-06-10

    For just the second time, crews have cut a hole in the top of an active radioactive waste storage tank at Hanford. Workers began cutting a 55-inch hole in the top of Tank C-105 last Tuesday night on graveyard shift, completing the cut early Wednesday. The hole will allow for installation of the Mobile Arm Retrieval System (MARS) Vacuum into the tank. The cut was made through 17 inches of concrete and rebar using the newly developed rotary-core cutting system, which uses a laser-guided steel canister with teeth on the bottom to drill a round hole into the tank dome. The project was completed safely and successfully in a high-rad area without contamination or significant dose to workers.

  6. Cutting fluids and clean technologies; Los fluidos de corte y las tecnologias limpias (III)

    Energy Technology Data Exchange (ETDEWEB)

    Terradillos, J.; Arnaiz, A.

    2003-07-01

    Metalworking fluids are an essential constituent of manufacturing and represent an important part of machining cost and disposal charges. Practically all cutting fluids currently in use fall into four categories: straight oils, soluble oils, semi-synthetic fluids and synthetic oils. The composition of these fluids depends on the machining requirements and primary functions include improving tool life, reducing thermal deformation of parts and improving surface finish and flushing away chips from the cutting zone. To maintain cutting fluid quality in the long term and, at the same time, reduce its environmental impact, three strategies could be followed: Prevention, Minimization and Evaluation, Related to prevention, different approaches exist for reducing the impact of cutting fluids. They include dry cutting, machining using a minimum quantity of lubricant (MQL) and developing environmental friendly acceptable formulations or refrigerant gases. (Author)

  7. Knowledge base technology for CT-DIMS: Report 1. [CT-DIMS (Cutting Tool - Database and Information Management System)

    Energy Technology Data Exchange (ETDEWEB)

    Kelley, E.E.

    1993-05-01

    This report discusses progress on the Cutting Tool-Database and Information Management System (CT-DIMS) project being conducted by the University of Illinois Urbana-Champaign (UIUC) under contract to the Department of Energy. This project was initiated in October 1991 by UIUC. The Knowledge-Based Engineering Systems Research Laboratory (KBESRL) at UIUC is developing knowledge base technology and prototype software for the presentation and manipulation of the cutting tool databases at Allied-Signal Inc., Kansas City Division (KCD). The graphical tool selection capability being developed for CT-DIMS in the Intelligent Design Environment for Engineering Automation (IDEEA) will provide a concurrent environment for simultaneous access to tool databases, tool standard libraries, and cutting tool knowledge.

  8. 刀具仿生技术的研究进展%Development of cutting tool bionic technology

    Institute of Scientific and Technical Information of China (English)

    2013-01-01

      仿生学可以为提高刀具的耐磨性和工作效率提供良好的借鉴思路。从形态仿生、构形仿生和材料仿生3个方面总结仿生技术在各类刀具设计中的应用,介绍各种仿生刀具的生物体原型、仿生特征以及仿生刀具的应用领域和效果。刀具的仿生设计涉及刀具的几何形状、涂层以及刀具的表面结构,刀具的应用领域包括机械加工、地质与空间勘探以及与人们生活相关的轻工机械等领域。讨论仿生刀具的特征,分析存在的问题,并展望了刀具仿生技术的研究方向。%Bionics can provide better design thoughts to improve wear resistance and cutting efficiency of cutting tool. The applications of bionic technology in the design of various types of cutting tool are summarized from three aspects of structure, form and material. The biological prototype,bionic characteristics,application area and effect of bionic cutting tools are introduced. The bionic designs of cutting tools involve tool geometry,coating and surface structure. The application fields of bionic tools concern with machining,geology,space exploration and light industry machinery associated with daily life. Finally, the characteristics of bionic tools are discussed. The existing problems and development trend of cutting tool bionic technology are also given.

  9. Forecasting and management of technology

    National Research Council Canada - National Science Library

    Roper, A. T

    2011-01-01

    "The new, revised edition of this book will build on this knowledge in the context of business organizations that now place a greater emphasis on technology to stay on the cutting edge of development...

  10. Influence of wood properties and technological parameters of processing on cutting power in milling of thermally modified beechwood

    Directory of Open Access Journals (Sweden)

    Mandić Marija

    2011-01-01

    Full Text Available The paper presents results of influence of thermal modification on cutting power required for milling wood processing. The experiment was conducted for the different treatment temperatures (170°C, 190°C and 210°C and different technological parameters of processing (feed and cutting depth. Cutting powers during milling were measured on four groups of beech wood samples, dimensions 35×16×400 mm, separately for heartwood and sapwood. The following mechanical and physical properties of the processed samples were tested: bending properties (modulus of rupture and modulus of elasticity, cross-sectional and tangential hardness, and air-dry density. The measuring device used for measuring, monitoring and displaying cutting power was developed at the Wood Machining Centre at the Faculty of Forestry in Belgrade. The results point out the differences in the powers required for processing heat-treated wood compared to untreated wood. The analysis shows that with the increase in treatment temperature, the required cutting powers decrease.

  11. Joint Performance for Laser Cutting-welding of Zinc-coated Tailored Blanks

    Institute of Scientific and Technical Information of China (English)

    WANG Chunming; HU Lunji; LIU Jianhua; HU Xiyuan; DU Hanbin

    2005-01-01

    The process of laser butt welding of zinc-coated steel ( SGCD3 and WLZn ) blanks was presented, whose edges were prepared by laser cutting. The properties of the butt joints, such as tensile strength, bending, stamping, weld shape, and corrosion- resistant were tested. The experiments of laser cutting and welding were carried out on a custom-made system designed, which is a set of equipment for wide sheet butt welding based on a laser cutting-welding combination process. The experiments proved the technological feasibility of laser butt welding for thin zinc coated steel sheets whose edges were prepared by laser cutting on the same equipment.

  12. Flexible Laser Metal Cutting

    DEFF Research Database (Denmark)

    Villumsen, Sigurd; Jørgensen, Steffen Nordahl; Kristiansen, Morten

    2014-01-01

    This paper describes a new flexible and fast approach to laser cutting called ROBOCUT. Combined with CAD/CAM technology, laser cutting of metal provides the flexibility to perform one-of-a-kind cutting and hereby realises mass production of customised products. Today’s laser cutting techniques...... possess, despite their wide use in industry, limitations regarding speed and geometry. Research trends point towards remote laser cutting techniques which can improve speed and geometrical freedom and hereby the competitiveness of laser cutting compared to fixed-tool-based cutting technology...... such as punching. This paper presents the concepts and preliminary test results of the ROBOCUT laser cutting technology, a technology which potentially can revolutionise laser cutting....

  13. Leading edge embedded fan airfoil concept -- A new powered high lift technology

    Science.gov (United States)

    Phan, Nhan Huu

    A new powered-lift airfoil concept called Leading Edge Embedded Fan (LEEF) is proposed for Extremely Short Take-Off and Landing (ESTOL) and Vertical Take-Off and Landing (VTOL) applications. The LEEF airfoil concept is a powered-lift airfoil concept capable of generating thrust and very high lift-coefficient at extreme angles-of attack (AoA). It is designed to activate only at the take-off and landing phases, similar to conventional flaps or slats, allowing the aircraft to operate efficiently at cruise in its conventional configuration. The LEEF concept consists of placing a crossflow fan (CFF) along the leading-edge (LE) of the wing, and the housing is designed to alter the airfoil shape between take-off/landing and cruise configurations with ease. The unique rectangular cross section of the crossflow fan allows for its ease of integration into a conventional subsonic wing. This technology is developed for ESTOL aircraft applications and is most effectively applied to General Aviation (GA) aircraft. Another potential area of application for LEEF is tiltrotor aircraft. Unlike existing powered high-lift systems, the LEEF airfoil uses a local high-pressure air source from cross-flow fans, does not require ducting, and is able to be deployed using distributed electric power systems throughout the wing. In addition to distributed lift augmentation, the LEEF system can provide additional thrust during takeoff and landing operation to supplement the primary cruise propulsion system. Two-dimensional (2D) and three-dimensional (3D) Computational Fluid Dynamics (CFD) simulations of a conventional airfoil/wing using the NACA 63-3-418 section, commonly used in GA, and a LEEF airfoil/wing embedded into the same airfoil section were carried out to evaluate the advantages of and the costs associated with implementing the LEEF concept. Computational results show that significant lift and augmented thrust are available during LEEF operation while requiring only moderate fan power

  14. Refrigerated cutting tools improve machining of superalloys

    Science.gov (United States)

    Dudley, G. M.

    1971-01-01

    Freon-12 applied to tool cutting edge evaporates quickly, leaves no residue, and permits higher cutting rate than with conventional coolants. This technique increases cutting rate on Rene-41 threefold and improves finish of machined surface.

  15. Particle-scale Analysis of Key Technologies on Cut-and-over Tunnel in Slope Engineering

    Directory of Open Access Journals (Sweden)

    J.H. Yang

    2014-08-01

    Full Text Available When the shallow tunnel is constructed on the slope terrain in the mountains, there are the potential risks such as landslide induced by cutting the slope and the non-compacted backfill material during the construction of the cut-andcover tunnel. In order to solve these problems, based on a practical engineering, the optimized construction plans of the cut-and-cover tunnel were analyzed by particle flow code (PFC, the key parts of the open-cut construction were identified, and the anti-slide piles countermeasures were proposed. Furthermore, the grouting reinforcement process for the non-compacted backfill material around the shallow tunnel was simulated by PFC, and the variation characteristics of the porosity and grouting pressure were revealed as well. The results are of great value to the similar engineering.

  16. 切割技术的发展现状及发展趋势%Development and Trend of Cutting Technology

    Institute of Scientific and Technical Information of China (English)

    蒋晓妍

    2016-01-01

    With the development of science and technology , modern cutting technology of multi-energy and multi-technology has made breakthrough progress , and has been widely applied in the field of modern in‐dustrial manufacture .This thesis has talked about the cutting technology principles and applications of the flame cutting ,plasma arc cutting ,laser cutting ,elertrospark -wire cutting ,water ject cutting ,and prospects for the development of the cutting technology in the future .%随着科学技术的进步,多能源、多种工艺方法的现代切割技术取得突破性进展,并且广泛的应用于现代工业制造领域中。本文主要从工作原理及使用现状两个方面,分别介绍了火焰切割技术、等离子弧切割技术、激光切割技术、电火花线切割技术和水射流切割技术,并展望未来切割技术发展趋势。

  17. Compensation for Error of Diamond Tool's Cutting Edge in Single Diamond Turning%超精密车削金刚石刀具刃口误差的高精度补偿

    Institute of Scientific and Technical Information of China (English)

    王毅; 余景池

    2011-01-01

    超精密车削中的金刚石刀具刃口误差的补偿问题一直是制约高精度非球面车削直接成形的瓶颈技术,尤其对于大相对口径,深度非球面的车削,金刚石刀具刃口误差对最终的面形的影响非常大.传统补偿方法是根据轮廓仪的测量结果对刀具刃口误差进行修正,但是该方法存在测量时间长,高频误差大,加工效率低的缺点,本文最先提出利用车削表面面形误差拟合后的泽尼克多项式系数对刀具刃口误差进行加工补偿,首先对该补偿方法进行了详细的理论推导,然后对补偿效果进行计算机模拟,最后在 Nanotech250 单点金刚石车床上完成了口径 50mm,半径 50 mm 大相对口径实验件的超精密车削及修正车削,面形精度 PV=86 nm,RMS=7 nm.充分证明该补偿符合预期,精度高,误差收敛速度快.%The compensation method for the error of diamond tool's cutting edge is a bottle-neck technology to hinder the high accuracy aspheric surface's directly formation after single diamond tuming. Especially to the big relative aperture aspheric, influence is bigger. Traditional compensation was done according to the measurement result from profile meter,which took long measurement time and caused low processing efficiency. A new compensation method was firstly put forward in the article, in which the correction of the error of diamond tool's cutting edge was done according to measurement result from digital interferometer. First, detailed theoretical calculation related with compensation method was deduced. Then, the effect after compensation was simulated by computer. Finally, φ 50 mm , radius 50 mm, work piece with big relative aperture finished its diamond turning and new correction turning under Nanotech 250. Testing surface achieved high shape accuracy PV=86 nm and RMS=7 nm, which approved of the new compensation method agreeing with predictive analysis, high accuracy and fast speed of error convergence.

  18. 绿色刀具设计的概念及关键技术%Concept & Key Technologies of Green Cutting Tool Design

    Institute of Scientific and Technical Information of China (English)

    王跃进

    2001-01-01

    介绍了绿色刀具设计的概念及绿色材料选择技术、面向可拆卸设计技术、面向可回收设计技术、绿色刀具评价方法等关键技术,指出绿色刀具设计与制造技术的应用将引起刀具产业的深刻变革。%The concept of green cutting tool design and its key technologies, including selection technology for green mate- rials, design technology for disassembly, design technology for recovering and evaluation methods for green cutting tools are introduced. It is pointed out that a profound change will be created in the cutting tool industry with increasing applications of the green cutting tool design and manufacturing technologies.

  19. 干切削的关键技术%Key Technology of Dry Cutting

    Institute of Scientific and Technical Information of China (English)

    张伯霖; 夏红梅; 黄晓明

    2001-01-01

    干切削作为一种新型的绿色制造技术,不仅能避免切削液对环境的污染,而且能大幅度降低产品的生产成本。本文论述干切削技术产生的历史背景、实现方法及其在工业中的实际应用。%As a new kind of green manufacturing, dry cutting is a effectivetechnology not only in avoiding the influences of cutting fluid on environment pollution, but also in reducing the production cost. The historical backgroround, realized methods and the application in industry of the dry cutting are presented in this paper.

  20. Research Progress of Laser Cutting Technology Domestic and Overseas%激光切割技术国内外研究现状

    Institute of Scientific and Technical Information of China (English)

    孙晓东; 王松; 赵凯华; 李国庆

    2012-01-01

    Laser cutting is one kind of advanced technology in the world. It is one of the most important parts in laser machining area. The characters of laser cutting equipment and laser cutting process are introduced, and the development trend of laser cutting process in the future is suggested.%总结了激光切割技术的特点,介绍了国内外激光切割设备和加工工艺研究现状,对激光切割工艺未来的发展提出了建议.

  1. Thomas Edison State College and Colorado State University: Using Cutting-Edge Technology to Enhance CE Unit Success

    Science.gov (United States)

    van Zyl, Henry; Powell, Albert, Jr.

    2012-01-01

    Thomas Edison State College (TESC) and Colorado State University (CSU) offer significant contrasts in institutional culture, student demographics, faculty and institutional priorities and approaches to distance education course development and delivery. This article offers case studies showing that widely disparate program design and delivery…

  2. Cutting forces during turning with variable depth of cut

    Directory of Open Access Journals (Sweden)

    M. Sadílek

    2016-03-01

    The proposed research for the paper is an experimental work – measuring cutting forces and monitoring of the tool wear on the cutting edge. It compares the turning where standard roughing cycle is used and the turning where the proposed roughing cycle with variable depth of cut is applied.

  3. Research on the low speed stability control technology of fly-cutting machine for KDP crystals

    Science.gov (United States)

    Chen, Dongsheng; Ji, Fang; Chen, Hua

    2014-08-01

    In the paper, The problem about stability in low speed of the air bearing stage driven by a linear motor was investigated to satisfy the ultra-precision fly-cutting of KDP crystals. First of all, the modal of the servo system with the permanent magnet synchronous linear motor was analyzed. In the system of the low speed linear motor driver, the main interferences came from cutting force f Load , the friction of chain and cable f n , the ripple thrust f ripp , and motor friction f fric . Secondly, the factors about low speed stability were analyzed: the key to improve the system's stability is to control the interference forces; Another important issue is to develop an advanced control strategy. Thirdly, some optimization experiments about low speed stability were developed as follows: the influence of feedback element, the influence of Power converter, speed optimization of damping feed-forward control, speed optimization of Spindle vibration, speed optimization based on disturbance observer. Finally the experimental results: the lowest speed of the stage can reach 0.2 mm/min; the error of the speed is less than 0.06mm/min when running between 1mm/min and 10 mm/min. The cutting experiment of KDP with the size of 330mm × 330mm × 10mm, was proceeded on the Fly-cutting machine by the feeding velocity of 1mm/min. The results about the surface roughness show that the value of Rq is 3.3nm and the value of Ra is 2.6nm.

  4. Institute a modest carbon tax to reduce carbon emissions, finance clean energy technology development, cut taxes, and reduce the deficit

    Energy Technology Data Exchange (ETDEWEB)

    Muro, Mark; Rothwell, Jonathan

    2012-11-15

    The nation should institute a modest carbon tax in order to help clean up the economy and stabilize the nation’s finances. Specifically, Congress and the president should implement a $20 per ton, steadily increasing carbon excise fee that would discourage carbon dioxide emissions while shifting taxation onto pollution, financing energy efficiency (EE) and clean technology development, and providing opportunities to cut taxes or reduce the deficit. The net effect of these policies would be to curb harmful carbon emissions, improve the nation’s balance sheet, and stimulate job-creation and economic renewal.

  5. Fracture mechanics analysis on Smart-Cut(R) technology. Part 1: Effects of stiffening wafer and defect interaction

    Institute of Scientific and Technical Information of China (English)

    Bin Gu; Hongyuan Liu; YiuWing Mai; Xi Qiao Feng; Shou Wen Yu

    2009-01-01

    In the present paper, continuum fracture mecha-nics is used to analyze the Smart-Cut process, a recently established ion cut technology which enables highly efficient fabrication of various silicon-on-insulator (SO1) wafers of high uniformity in thickness. Using integral transform and Cauchy singular integral equation methods, the mode-Ⅰ and mode-II stress intensity factors, energy release rate, and crack opening displacements are derived in order to examine seve-ral important fracture mechanisms involved in the Smart-Cut process. The effects of defect interaction and stiffening wafer on defect growth are investigated. The numerical results indi-cate that a stiffener/handle wafer can effectively prevent the donor wafer from blistering and exfoliation, but it slows down the defect growth by decreasing the magnitudes of SIF's. Defect interaction also plays an important role in the splitting process of SOI wafers, but its contribution depends strongly on the size, interval and internal pressure of defects. Finally, an analytical formula is derived to estimate the implantation dose required for splitting a SOI wafer.

  6. Role of the CSIR/WRC Sanitation Technology Demonstration Centre in creating awareness, sharing information and in decision-making regarding sanitation technologies

    CSIR Research Space (South Africa)

    Mema, V

    2010-09-01

    Full Text Available The CSIR and the Water Research Commission (WRC) have envisioned a Sanitation Technology Demonstration Centre to provide a cutting-edge environment for bringing to light old and new, as well as promising sanitation technologies. The purpose...

  7. Survey of technology for decommissioning of nuclear fuel cycle facilities. 8. Remote handling and cutting techniques

    Energy Technology Data Exchange (ETDEWEB)

    Ogawa, Ryuichiro; Ishijima, Noboru [Japan Nuclear Cycle Development Inst., Oarai, Ibaraki (Japan). Oarai Engineering Center

    1999-03-01

    In nuclear fuel cycle facility decommissioning and refurbishment, the remote handling techniques such as dismantling, waste handling and decontamination are needed to reduce personnel radiation exposure. The survey research for the status of R and D activities on remote handling tools suitable for nuclear facilities in the world and domestic existing commercial cutting tools applicable to decommissioning of the facilities was conducted. In addition, the drive mechanism, sensing element and control system applicable to the remote handling devices were also surveyed. This report presents brief surveyed summaries. (H. Itami)

  8. HYDRO-ABRASIVE JET CLEANING TECHNOLOGY OF STEEL SHEETS DESIGNED FOR LASER CUTTING

    Directory of Open Access Journals (Sweden)

    I. Kachanov

    2013-01-01

    Full Text Available Investigations executed by the BNTU “Shipbuilding and hydraulics” department have shown that rather efficient implementation of the requirements to the metal sheet surface designed for laser cutting can be achieved by using hydro-abrasive jet cleaning while applying water pump equipment with the range of pressure – 20–40 MPa. Type of working fluid plays a significant role for obtaining surface of the required quality. The conducted experiments have demonstrated that the efficient solution of the assigned problems can be ensured by using a working fluid containing bentonite clay, surface-active agent polyacrylamide, soda ash and the rest water.

  9. Fracture mechanics analysis on Smart-Cut technology. Part 2: Effect of bonding flaws

    Institute of Scientific and Technical Information of China (English)

    Bin Gu; Hongyuan Liu; Yiu-Wing Mai; Xi Qiao Feng; Shou Wen Yu

    2009-01-01

    In Part 2 of the paper on the Smart-Cut process,the effects of bonding flaws characterized by the size and internal pressure before and after splitting are studied by using fracture mechanics models. It is found that the bonding flaws with large size are prone to cause severe deviation of defect growth, leading to a non-transferred area of thin layer when splitting. In a practical Smart-Cut process where the internal pressure of bonding flaws is very small,large interfacial defects always promote defect growth in the splitting process. Meanwhile, increasing the internal pressure of the bonding flaws decreases the defect growth and its deviation before splitting. The mechanism of relaxation of stiffener constraint is proposed to clarify the effect of bonding flaws. Moreover, the progress of the splitting process is analyzed when bonding flaws are present. After splitting,those bonding flaws with large size and high internal pressure are vulnerable for the blistering of the thin film during high-temperature annealing.

  10. The Development Mechanism and the Technical Characteristics of the Modern Cutting Technology%现代切削技术的发展机制及技术特征

    Institute of Scientific and Technical Information of China (English)

    赵炳桢

    2006-01-01

    The development mechanism and mode and the new technical characteristics of the modern cutting technology are studied and analyzed. It is presented that to speed up the development of cutting technology and fully use the good-quality technical resource of cutting tool have the significant meaning for construction of powerful manufacturing industry of China.

  11. Short Cuts and Extended Techniques: Rethinking Relations between Technology and Educational Theory

    Science.gov (United States)

    Thumlert, Kurt; de Castell, Suzanne; Jenson, Jennifer

    2015-01-01

    Building upon a recent call to renew actor-network theory (ANT) for educational research, this article reconsiders relations between technology and educational theory. Taking cues from actor-network theorists, this discussion considers the technologically-mediated networks in which learning actors are situated, acted upon, and acting, and traces…

  12. Study of formation boundary and dip attribute extraction based on edge detection technology

    Institute of Scientific and Technical Information of China (English)

    WANG Yanbo; SUN Jianguoand SONG Chao

    2016-01-01

    In the seismic profile interpretation process,as the seismic data are big and the small geological fea-tures are difficult to identify,improvement of the efficiency is needed.In this study,structure tensor method in computer image edge detection processing is applied into the 2D seismic profile.Coherent attribute is used to extract formation edge.At the same time,extracting the eigenvalues and eigenvectors to calculate the seismic geometric properties which include dip and apparent dip,automatic identification is achieved.Testing the Gaussian kernel function with synthetic models and comparing the coherent attribute and dip attribute extraction results before and after,the conclusion that Gaussian filter can remove the random noise is obtained.

  13. Laser Cutting, Development Trends

    DEFF Research Database (Denmark)

    Olsen, Flemming Ove

    1999-01-01

    In this paper a short review of the development trends in laser cutting will be given.The technology, which is the fastest expanding industrial production technology will develop in both its core market segment: Flat bed cutting of sheet metal, as it will expand in heavy industry and in cutting o...... of 3-dimensional shapes.The CO2-laser will also in the near future be the dominating laser source in the market, although the new developments in ND-YAG-lasers opens for new possibilities for this laser type.......In this paper a short review of the development trends in laser cutting will be given.The technology, which is the fastest expanding industrial production technology will develop in both its core market segment: Flat bed cutting of sheet metal, as it will expand in heavy industry and in cutting...

  14. Cutting Edges and Weaving Threads in the Gene Editing (Я)evolution: Reconciling scientific progress with Legal, Ethical, & Social concerns (under review)

    DEFF Research Database (Denmark)

    Nordberg, Ana; Minssen, Timo; Holm, Sune Hannibal

    2017-01-01

    Gene editing technologies, such as CRISPR/Cas9, hold great promises for the advancement of science and technology. These foundational technologies enable to modify the genetic structure of living organisms with unprecedented precision. Potential applications include both plant, animal and human...... genetic interventions. In plant biology, gene editing introduces more precise, target- and time-efficient tools to engineer plants for multipurpose uses such as crops, medicines or biofuel. In humans, the technologies offers hope in the fight against severe genetic diseases and many other illnesses. Yet...... scientists, and physicists analyses and discusses the most problematic legal, ethical and societal implications of gene editing....

  15. 尾缘锯齿修形对波瓣强迫混合排气系统性能影响%Effect of serrated cut at trailing edge on performance of lobed mixer in forced mixing exhaust system

    Institute of Scientific and Technical Information of China (English)

    丁玉林; 刘友宏; 谢翌; 邵万仁; 吴飞

    2012-01-01

    针对某涡扇发动机波瓣强迫混合排气系统建立了尾缘锯齿修形流场数值计算模型,通过三维数值模拟研究,得到了不同尾缘锯齿修形波瓣强迫混合排气系统流场的演变规律和热混合效率、总压恢复系数的变化规律.结果表明:在强迫混合排气系统出口截面处,热混合效率随修形量的增加而增大,总压恢复系数随修形量的增加而减少.1个三角形(1-SJ)锯齿修形模型的热混合效率最大达到79.73%;2个梯形修形(2-TX)的综合效果最优,其热混合效率达到77.50%总压恢复系数比1-SJ高出0.5%.%Based on a lobed mixer in the forced mixing exhaust system of a turbofan engine,geometric models of different serrated cuts at trailing edge were constructed.Through three-dimensional computational fluid dynamic simulations,the effect of serrated cut at trailing edge on the performance of a lobed mixer in a forced mixing exhaust system on the thermal mixing efficiency and total-pressure recovery coefficient were studied.The results show that the thermal mixing efficiency rises while the total-pressure recovery coefficient declines as the cut size of the serrated cut increases.The thermal mixing efficiency of one triangle(1-SJ) serrated modification model was 79.73%.The thermal mixing efficiency of two trapezoidal modifications(2-TX) was 77.50%,and the total-pressure recovery coefficient of 2-TX was 0.5 percentage higher than that of 1-SJ.

  16. NASA Space Technology Roadmaps and Priorities: Restoring NASA's Technological Edge and Paving the Way for a New Era in Space

    Science.gov (United States)

    2012-01-01

    Success in executing future NASA space missions will depend on advanced technology developments that should already be underway. It has been years since NASA has had a vigorous, broad-based program in advanced space technology development, and NASA's technology base is largely depleted. As noted in a recent National Research Council report on the U.S. civil space program: Future U.S. leadership in space requires a foundation of sustained technology advances that can enable the development of more capable, reliable, and lower-cost spacecraft and launch vehicles to achieve space program goals. A strong advanced technology development foundation is needed also to enhance technology readiness of new missions, mitigate their technological risks, improve the quality of cost estimates, and thereby contribute to better overall mission cost management. Yet financial support for this technology base has eroded over the years. The United States is now living on the innovation funded in the past and has an obligation to replenish this foundational element. NASA has developed a draft set of technology roadmaps to guide the development of space technologies under the leadership of the NASA Office of the Chief Technologist. The NRC appointed the Steering Committee for NASA Technology Roadmaps and six panels to evaluate the draft roadmaps, recommend improvements, and prioritize the technologies within each and among all of the technology areas as NASA finalizes the roadmaps. The steering committee is encouraged by the initiative NASA has taken through the Office of the Chief Technologist (OCT) to develop technology roadmaps and to seek input from the aerospace technical community with this study.

  17. Overcoming Resistance to Instructional Technology.

    Science.gov (United States)

    Powers, William G.; Anderson, Susan; Love, Don

    2000-01-01

    Administrators must convince and motivate faculty to adopt instructional technology if departments are to remain on the cutting edge. Describes seven actions to promote the use of instructional technology: know your faculty; be aware of faculty concerns; use technology yourself; review potential barriers; explore and obtain resources; communicate…

  18. 圆弧头立铣刀端刃CNC磨削仿真技术研究%Research on CNC grinding simulation technology of torus end milling cutter's end edges

    Institute of Scientific and Technical Information of China (English)

    刘建军; 黎荣; 程雪锋; 金晓波; 丁国富

    2012-01-01

    A technology on universal end edges model and CNC grinding simulation of torus end milling cutters is introduced. With the theory of space vector rotation,the universal mathematic model of end edges above center or not was builded. Based on the accurate cutting - edge model, the grinding processes of the end milling cutter end - edge rake & flank faces were researched, and also the wheel' s moving path and tool axis vector were calculated. Meanwhile, the post processing program of five-axis NC grinder and the virtual simulation environment based on VERICUT software were developed, and three kinds of end-edge models with different tooth number were geted through grinding simulation,which validated acquired cutter location data. Taking four edges end milling cutter with two edges above center as example, the grinding simulation technology proposed was verified by measuring the structure parameters of simulation model and physical model,and comparing them with design parameters.%介绍一种圆弧头立铣刀端刃的通用建模及CNC磨削仿真技术.运用空间矢量旋转原理,对过中心和不过中心端齿刃线建立通用数学模型.基于所建立的精确刃线数模,研究了立铣刀端刃前、后刀面的磨削加工工艺并计算出砂轮的运动轨迹和刀轴矢量.开发了五轴数控磨床的后置处理程序和基于VERICUT软件的虚拟仿真环境,加工出三类不同齿数的立铣刀端齿模型,对获得的刀位数据正确性进行了验证.以两齿过中心的四齿平底立铣刀为例,通过测量仿真模型和加工实物的结构参数并与设计参数进行对比,验证了提出的磨削仿真技术的可行性.

  19. INFLUENCE OF SELECTED PINION CUTTING TECHNOLOGICAL PARAMETERS ON KINEMATIC QUALITY OF SPIRAL BEVEL GEARS

    Directory of Open Access Journals (Sweden)

    Jadwiga PISULA

    2014-06-01

    Full Text Available The article evaluated the effect of selected process parameters on the accuracy of kinematic spiral bevel gear pair. The changes of technological parameters were analyzed using a proprietary, non-commercial support system for design bevel gears. The effect of the parameter changes were observed in the motion graph of the gear and pinion mesh with ratio 4:99. It has been shown that the modifications of technological parameters can produce a small positive effect on fluency of motion, but predominantly have a negative impact on the accuracy of kinematic.

  20. Cutting through the Hype: Evaluating the Innovative Potential of New Educational Technologies through Business Model Analysis

    Science.gov (United States)

    Kalman, Yoram M.

    2016-01-01

    In an era when novel educational technologies are constantly introduced to the marketplace, often accompanied by hyperbolic claims that these ground-breaking innovations will transform the educational landscape, decision makers in educational institutions need a methodological approach for examining the innovative potential of new educational…

  1. Cutting through the Hype: Evaluating the Innovative Potential of New Educational Technologies through Business Model Analysis

    Science.gov (United States)

    Kalman, Yoram M.

    2016-01-01

    In an era when novel educational technologies are constantly introduced to the marketplace, often accompanied by hyperbolic claims that these ground-breaking innovations will transform the educational landscape, decision makers in educational institutions need a methodological approach for examining the innovative potential of new educational…

  2. Micro Cutting Tools and Micro Drilling Technology%微细刀具与微钻削关键技术

    Institute of Scientific and Technical Information of China (English)

    李秋玥; 贾晓鸣; 张好强

    2014-01-01

    微小孔加工在小型化、集成化的制造领域得到越来越广泛的应用,人们对微小孔加工尤其是微钻削加工技术的研究逐步深入。对微钻削加工技术及微细刀具进行了综合的介绍,分别从微细钻削刀具、微钻削理论、切屑分析、刀具磨损等方面进行了论述,提出微钻削与常规尺度钻削的差异,并对微钻削技术的发展前景进行展望。%The machining of micro holes is widely used in miniature and integrated manufacturing fields. The machi-ning technology of micro holes especially micro drilling was studied deeply. The technology of micro drilling and mi-cro cutting tools is introduced. The micro drilling tool,micro drilling theory,chip analysis and tool wear,etc is dis-cussed respectively. The difference between micro drilling and conventional drilling is put forward. The development of micro drilling technology is prospected.

  3. Postphenomenological Investigations: Essays on Human-Technology Relations

    NARCIS (Netherlands)

    Rosenberger, Robert; Verbeek, Peter-Paul

    2015-01-01

    Postphenomenological Investigations: Essays on Human–Technology Relations provides an introduction to the school of thought called postphenomenology and showcases projects at the cutting edge of this perspective. Postphenomenology presents a unique blend of insights from the philosophical traditions

  4. Edge Detection,

    Science.gov (United States)

    1985-09-01

    PROJECT. T ASK0 Artificial Inteligence Laboratory AREA It WORK UNIT NUMBERS V 545 Technology Square ( Cambridge, HA 02139 I I* CONTOOL1LIN@4OFFICE NAME...ARD-A1t62 62 EDGE DETECTION(U) NASSACNUSETTS INST OF TECH CAMBRIDGE 1/1 ARTIFICIAL INTELLIGENCE LAB E C HILDRETH SEP 85 AI-M-8 N99SI4-8S-C-6595...used to carry out this analysis. cce~iO a N) ’.~" D LI’BL. P p ------------ Sj. t i MASSACHUSETTS INSTITUTE OF TECHNOLOGY i ARTIFICIAL INTELLIGENCE

  5. Aeroelastic Control of a Segmented Trailing Edge Using Fiber Optic Strain Sensing Technology

    Science.gov (United States)

    Graham, Corbin Jay; Martins, Benjamin; Suppanade, Nathan

    2014-01-01

    Currently, design of aircraft structures incorporate a safety factor which is essentially an over design to mitigate the risk of structure failure during operation. Typically this safety factor is to design the structure to withstand loads much greater than what is expected to be experienced during flight. NASA Dryden Flight Research Centers has developed a Fiber Optic Strain Sensing (FOSS) system which can measure strain values in real-time. The Aeroelastics Lab at the AERO Institute is developing a segmented trailing edged wing with multiple control surfaces that can utilize the data from the FOSS system, in conjunction with an adaptive controller to redistribute the lift across a wing. This redistribution can decrease the amount of strain experienced by the wing as well as be used to dampen vibration and reduce flutter.

  6. A cutting force model for micromilling applications

    DEFF Research Database (Denmark)

    Bissacco, Giuliano; Hansen, Hans Nørgaard; De Chiffre, Leonardo

    2006-01-01

    In micro milling the maximum uncut chip thickness is often smaller than the cutting edge radius. This paper introduces a new cutting force model for ball nose micro milling that is capable of taking into account the effect of the edge radius.......In micro milling the maximum uncut chip thickness is often smaller than the cutting edge radius. This paper introduces a new cutting force model for ball nose micro milling that is capable of taking into account the effect of the edge radius....

  7. Cutting the Umbilical: New Technological Perspectives in Benthic Deep-Sea Research

    Directory of Open Access Journals (Sweden)

    Angelika Brandt

    2016-05-01

    Full Text Available Many countries are very active in marine research and operate their own research fleets. In this decade, a number of research vessels have been renewed and equipped with the most modern navigation systems and tools. However, much of the research gear used for biological sampling, especially in the deep-sea, is outdated and dependent on wired operations. The deployment of gear can be very time consuming and, thus, expensive. The present paper reviews wire-dependent, as well as autonomous research gear for biological sampling at the deep seafloor. We describe the requirements that new gear could fulfil, including the improvement of spatial and temporal sampling resolution, increased autonomy, more efficient sample conservation methodologies for morphological and molecular studies and the potential for extensive in situ real-time studies. We present applicable technologies from robotics research, which could be used to develop novel autonomous marine research gear, which may be deployed independently and/or simultaneously with traditional wired equipment. A variety of technological advancements make such ventures feasible and timely. In proportion to the running costs of modern research vessels, the development of such autonomous devices might be already paid off after a discrete number of pioneer expeditions.

  8. The Current Status of Electric Spark Line Cutting Technology in China%国内电火花线切割技术研发的探讨

    Institute of Scientific and Technical Information of China (English)

    胥宏; 张世凭; 连帅梅

    2013-01-01

      从快走丝电火花切割和慢走丝电火花切割两方面概述了国内电火花线切割技术的发展及应用现状。介绍了电火花线切割机床的加工原理、加工特点、加工范围及应用领域;并从主机制造技术、脉冲电源技术、控制技术以及加工工艺技术4个方面探讨双向快走丝电火花线切割技术的发展现状。%This article summarized the development and application of high speed WEDM wire cutting and Slow-feeding WEDM outlined electric spark line cutting technology in China in two aspects, described the processing principle of electric spark linear cutting machine tool, the processing characteristic and the processing range and application field;and discussed the current development status of two-way fast wire EDM wire cutting from four aspects of host machine manufacturing technology, pulsed power supply technology, control technology and processing technology .

  9. A Preliminary Study on Ultrasonic Cutting Process for Carbon Fibre Prepreg

    Institute of Scientific and Technical Information of China (English)

    2001-01-01

    In ultrasonic cutting process, the cutting pressure is still essential for achieving good quality cut edge compared with traditional mechanical cutting process. With the increase of the cutting power, the cutting pressure demand decreases. The cutting velocity range is extended broadly. The experiment results show that ultrasonic cutting technique is an effective, clean and controllable method for machining of carbon fibre prepreg.

  10. Launching an Academic Career: On the Cutting Edge Resources for Geoscience Graduate Students, Post-doctoral Fellows, and Early Career Faculty

    Science.gov (United States)

    Richardson, R. M.; Ormand, C. J.; MacDonald, H.; Dunbar, R. W.; Allen-King, R. M.; Manduca, C. A.

    2010-12-01

    Launching an academic career presents a number of challenges. A recent article in the Chronicle of Higher Education depicts academia as an “ivory sweatshop,” citing rising standards for tenure. Most graduate programs provide minimal training for life beyond graduate school. The professional development program “On the Cutting Edge” fills this gap by providing workshops and web resources on academic careers for graduate students, postdoctoral fellows, and early career faculty. These workshops and web resources address a wide range of topics related to teaching, research, and managing one’s career, tailored for each group. The Preparing for an Academic Career in the Geosciences workshop to help graduate students and postdoctoral fellows make the transition into an academic career has been offered annually since 2003. It provides a panel on academic careers in different institutional settings, sessions on research on learning, various teaching strategies, design of effective teaching activities, moving research forward to new settings, effective teaching and research statements, the job search process, negotiation, and presenting oneself to others. Complementary online resources (http://serc.carleton.edu/NAGTWorkshops/careerprep/index.html) focus on these topics. The workshops and web resources offer guidance for each step of the job search process, for developing and teaching one’s own courses, and for making the transition from being a research student to being in charge of a research program. Online resources also include case studies of successful dual career couples, documenting their job search strategies. A four-day workshop for Early Career Geoscience Faculty: Teaching, Research, and Managing Your Career, offered annually since 1999, provides sessions on teaching strategies, course design, developing a strategic plan for research, supervising student researchers, navigating departmental and institutional politics, preparing for tenure, time and

  11. Use of precision agriculture technology to investigate spatial variability in nitrogen yields in cut grassland.

    Science.gov (United States)

    Bailey, J S; Wang, K; Jordan, C; Higgins, A

    2001-01-01

    Spatial variability in N uptake and utilisation by swards within uniformly managed field units could be responsible for a significant proportion of the NH3, N2O, NO3- and NOx (NO and NO2) 'pollutants' generated by agriculture and released to the environment. An investigation was commenced, therefore, to quantify, map and explain the spatial variability in sward N yield in a 'large' silage field and to assess the potential for managing this variability using some of the latest precision agriculture technology. Sward dry matter (DM) and N yields were predicted from the results of plant tissue analyses using mathematical models. Sward N yields were found to vary greatly across the field seemingly because of differences in net soil N mineralisation, but the pattern of variability appeared to remain constant with time. Conventional soil analysis of a range of soil chemical and physical properties, however, failed to explain this variability. It was concluded that the N-yield distribution map might be used in place of soil analysis as the basis for varying the rates of N application to different parts of the field with the twin objectives of maximising fertiliser use efficiency and minimising N emissions to air and water.

  12. Blowout win : advances in BOP technology cut waste and make work safer for drilling crews

    Energy Technology Data Exchange (ETDEWEB)

    Budd, G.

    2008-03-15

    With the advent of programmable logic controllers (PLCs), there has been significant improvement in the way that blowout prevention (BOP) equipment can be controlled and operated. The accumulator, which provides the energy to operate the BOP, usually includes compressed gas bottles, regulator valves, pumps, a hydraulic reservoir, a manifold, and control valves. PLCs have made the accumulator easier to operate since they have eliminated much of the cable that spans from the control panel to the rig control shack. The control unit currently consists of some computer chips and a printed circuit instead of miles of wires and cables. In addition to providing efficient BOP control, PLCs have enabled rig managers to readily identify and fix problems. Some manufacturers have included remote troubleshooting capability for the accumulator. Advances in BOP technology and controls have been driven by the challenges of drilling in harsh offshore environments. However, some operators in the Western Canadian Sedimentary Basin continue to use BOP systems that have been around for decades because of their reputation for reliability and low-maintenance requirements. 1 fig.

  13. Determination of cut front position in laser cutting

    Science.gov (United States)

    Pereira, M.; Thombansen, U.

    2016-07-01

    Laser cutting has a huge importance to manufacturing industry. Laser cutting machines operate with fixed technological parameters and this does not guarantee the best productivity. The adjustment of the cutting parameters during operation can improve the machine performance. Based on a coaxial measuring device it is possible to identify the cut front position during the cutting process. This paper describes the data analysis approach used to determine the cut front position for different feed rates. The cut front position was determined with good resolution, but improvements are needed to make the whole process more stable.

  14. Visualization Analysis of Hot Spot and Cutting-Edge about Knowledge Sharing%知识共享研究热点与前沿的可视化分析

    Institute of Scientific and Technical Information of China (English)

    王伟军; 官思发; 李亚芳

    2012-01-01

    本文以ISIWebofScience数据库中收录的以知识共享为主题的文献信息作为数据源,然后运用CiteSpaceⅡ软件绘制了知识共享研究领域的国家或地区分布、机构分布、经典作品和研究热点与前沿的知识图谱,并进行了分析。研究发现,美国、英国、日本、德国和瑞典等在知识共享领域开展了广泛的合作研究,并且产出总量丰富。本文将研究热点与前沿分为知识共享相关的理论研究、技术方法研究和实践应用三个层面的内容。主要包括设计、交流、本体、网络、绩效、隐性知识、实践社区、知识建模、决策支持、人力资源开发、信息可视化、分布式案例推理和Web2.0等。%This paper selects ISI Web of Knowledge database to retrieve source data on the theme of knowledge sharing, and uses CiteSpaceⅡsoftware to draw knowledge domain map of national or regional distribution, institutional distribution, classic works, hot-spot and cutting-edge research content about knowledge sharing, then makes specific analyses. Study found that a wide range of collaborative research developed in the United States, Britain, Japan, Germany and Sweden etc. in the field of knowledge sharing, and the total output of papers of each country is comparatively rich. This paper divides the hot and cutting-edge research fields about knowledge sharing into three aspects including basic theories, methods and tech- nology support, and practical applications which are mainly consists of the design, communication, ontology, network, per- formance, tacit knowledge, communities of practice, knowledge modeling, decision support and human resources develop- ment, information visualization, distributed case reasoning and Web 2.0.

  15. 半封闭边水油藏特高含水期剩余油分布特征%Predicting Remaining Oil Distribution of Semi-Enclosed Edge Water Reservoir in Extra High Water Cut Period

    Institute of Scientific and Technical Information of China (English)

    孙全力; 冯文光; 姚昌宇

    2011-01-01

    双河油田437块Ⅱ4-6层系是一个典型的半封闭边水油藏,边水活跃,目前油藏进入特高含水期,单元采出程度45.82%,综合含水率高达97.8%.根据储层地质资料,采用协同克里金确定性建模方法建立了双河油田437块Ⅱ4-6层系的三维地质模型.利用三维地质建模成果,结合储层地质特征、地层流体性质以及油藏生产动态资料,采用油藏数值模拟的方法,得出目前双河油田437块Ⅱ4-6层系剩余油的分布特征及剩余油富集区域,为开发方案调整,高含水期剩余油挖潜提供了可靠的依据.%Shuanghe Oilfield 437II4-6 is a typical semi-closed edge water reservior. Edge wate is active in this area, and reservoir is now in the development phase of extra high water cut period currently. The unit recovery efficiency is 45.82%, and water percentage 97.8%. By using reservoir numerical simulation method and according to reservoir geology, 3D geological model of Shuanghe oilfield 437II4-6 is established, and the distribution data of remaining oil and residual oil region of Shuanghe Oilfield 437II4-6 are obtained. The basis for adjusting development plan and for digging the potential of remaining oil in high water cut period was provided.

  16. A Technology Plan That Works

    Science.gov (United States)

    Overbay, Amy; Mollette, Melinda; Vasu, Ellen S.

    2011-01-01

    Digital learners are hungry to use technology in school. And many schools are responding by delivering cutting-edge equipment to all teachers and students and infusing this technology into instruction. This is all well and good. But as evaluators with the Friday Institute for Educational Innovation, the authors have observed several major…

  17. Integrated Biomaterials for Biomedical Technology

    CERN Document Server

    Ramalingam, Murugan; Ramakrishna, Seeram; Kobayashi, Hisatoshi

    2012-01-01

    This cutting edge book provides all the important aspects dealing with the basic science involved in materials in biomedical technology, especially structure and properties, techniques and technological innovations in material processing and characterizations, as well as the applications. The volume consists of 12 chapters written by acknowledged experts of the biomaterials field and covers a wide range of topics and applications.

  18. Research of Laser Cutting Technology for Leaf-shaped Holes%激光切割加工叶型孔工艺研究

    Institute of Scientific and Technical Information of China (English)

    宋一凡; 丁殿强

    2015-01-01

    以激光切割技术加工航天涡扇发动机内外壳体叶型孔为背景,通过对补偿方式、拐角烧伤、锥度控制以及切口质量等工艺问题设计实验,得到较优的工艺方法及工艺参数,利用此工艺实现了叶型孔尺寸精度和切口质量的双重控制,且叶型孔的加工成功率高,在后续与叶型钎焊工序中焊接质量好。%Laser cutting technology is widely employed to process the leaf-shaped holes on the internal and external shells of aerospace turbofan engines. In this work, the compensation method, the burn of corner, the control of conical degree and the cutting quality are taken into consideration to design the experiments and the optimum processing methods and parameters are obtained for this laser cutting technology. Both the dimensional precision and the cutting quality of the leaf-shaped holes are achieved by the optimized technology and a high processing rate is achieved as well. Furthermore, excellent welding quality was kept during the subsequent leaf-shaped soldering and welding.

  19. Influence of built-up edge phases on characteristics of surface profile of micro cutting%积屑瘤状态对微细切削表面轮廓特征的影响

    Institute of Scientific and Technical Information of China (English)

    刘志兵; 王西彬

    2011-01-01

    研究了微细切削条件下,刀具前刀面上的积屑瘤状态对切削表面轮廓特征的影响,为合理选择和控制微细切削刀具的切削条件,以及评价微细切削的表面形貌特征提供实验依据.利用表面粗糙度仪分别提取了无积屑瘤、积屑瘤生长、稳定和脱落等4种积屑瘤状态下的切削表面轮廓,选取幅值密度函数(ADF)、自相关函数(ACF)和功率谱密度函数(PSD)等数理统计函数,以及时间序列模型参数和自回归(AR)谱分析了聚晶金刚石(PCD)刀具表面积屑瘤状态对微细切削表面轮廓特征的影响规律.结果表明,无积屑瘤和积屑瘤稳定阶段,AR谱的谱峰分别出现在91.7 c/mm和93.7 c/mm处,与进给量的倒数比较接近;积屑瘤生长和脱落状态阶段,谱峰出现的空间频率明显偏低,与进给量之间的对应关系不再显著.积屑瘤与切屑之间的不规则接触将破坏微细切削表面轮廓空间结构的一致性;积屑瘤生长和脱落阶段获得的表面轮廓的AR谱中存在明显的空间低频谱峰.%The influences of Built-up Edge(BUE) phases of a rake face on the characteristics of surface profile of micro cutting were researched, which provided the proof for the optimal selection of cutting parameters and the evaluation for the characteristics of surface profile of micro cutting. The surface profile data in micro cutting were measured with a profilometer in different BUE phases, BUE free,BUE formation, BUE stable and BUE drop. The influences of the BUEs on the characteristics of machined surface profiles were analyzed with mathematical statistical functions such as Amplitude Density Function(ADF), Auto-correlation Function(ACF) and Power Spectral Density Function(PSD), as well as the time series model parameters and Auto Regression(AR) spectra. Obtained results indicate that in BUE free and BUE stable phases, the AR spectral peaks of micro cutting surface locate at 91.7 c/mm and 93.7 c/mm, respectively

  20. Laser cutting of Kevlar laminates and thermal stress formed at cutting sections

    Science.gov (United States)

    Yilbas, B. S.; Akhtar, S. S.

    2012-02-01

    Laser cutting of Kevlar laminates is carried out and thermal stress field developed in the cutting region is predicted using the finite element code. Temperature predictions are validated through the thermocouple data. The morphological changes in the cutting section are examined by incorporating optical and scanning electron microscopes. It is found that temperature predictions agree well with the thermocouple data. High values of von Mises stress are observed at the cutting edges and at the mid-thickness of the Kevlar laminate due to thermal compression formed in this region. The laser cut edges are free from whiskers; however, striation formation and some small sideways burning is observed at the kerf edges.

  1. The role of National Strategies in maintaining Competitive Edge in Information and Communication Technologies

    Directory of Open Access Journals (Sweden)

    Ciprian Popoviciu

    2006-12-01

    Full Text Available This paper examines the economical impact of IPv6, Internet Protocol's next generation. Technically, IPv6 represents an upgrade, an evolution that offers the resources necessary for deeper and wider market penetration of the IP technology, to support the needs of a global economy, to build new products and new services. Politically and economically it has the potential of being a quiet revolution. Countries that trailed US into the information revolution recognize this opportunity to take a leading role in its next expansion phase and have developed national strategies to help better position their respective economies. Despite understanding the constraints imposed by the current version of IP, the private sector is currently inclined to largely ignore IPv6 because of its initial deployment costs and long term returns. Forced by high investor expectations to focus exclusively on the immediate bottom line it trades long term growth opportunities for short term benefits revolving around productivity increases. The paper analyses the importance of a National Strategy in driving IPv6 adoption and in closing a widening knowledge and deployment gap between US and countries such as China, Japan, Korea and the EU.

  2. The role of National Strategies in maintaining Competitive Edge in Information and Communication Technologies

    Directory of Open Access Journals (Sweden)

    Ciprian Popoviciu

    2006-12-01

    Full Text Available This paper examines the economical impact of IPv6, Internet Protocol's next generation. Technically, IPv6 represents an upgrade, an evolution that offers the resources necessary for deeper and wider market penetration of the IP technology, to support the needs of a global economy, to build new products and new services. Politically and economically it has the potential of being a quiet revolution. Countries that trailed US into the information revolution recognize this opportunity to take a leading role in its next expansion phase and have developed national strategies to help better position their respective economies. Despite understanding the constraints imposed by the current version of IP, the private sector is currently inclined to largely ignore IPv6 because of its initial deployment costs and long term returns. Forced by high investor expectations to focus exclusively on the immediate bottom line it trades long term growth opportunities for short term benefits revolving around productivity increases. The paper analyses the importance of a National Strategy in driving IPv6 adoption and in closing a widening knowledge and deployment gap between US and countries such as China, Japan, Korea and the EU.

  3. 多重耐药微生物的实验室检测新技术%Detection of multidrug-resistant microbial pathogens by cutting-edge laboratory techniques

    Institute of Scientific and Technical Information of China (English)

    陆学东; 汤一苇

    2011-01-01

    A dramatic upsurge in the use of nucleic acid amplification-based assays for the direct detection of microbial genes and gene mutations related to antibiotic resistance has been noticed. Rapid and accurate molecular detection tools will play a critical role in controlling the spread of multidrug-resistant pathogens worldwide in the future. In this review, the authors briefly introduce several cutting-edge techniques such as multiplex real-time PCR with melting curve analysis, reverse line probe assay, suspension microarrays, time-of-flight mass spectrometry and point-of-care molecular assays and their current applications to antimicrobial susceptibility testing.%以核酸体外放大为基础,直接检测与微生物耐药有关基因及突变的实验室技术近年来快速崛起.快速、准确的分子生物学检测方法 将在全球的多重耐药微生物防控中起决定性作用.笔者对多重PCR技术结合溶解曲线分析、反向线性杂交技术、基因芯片技术、飞行时间质谱技术及现场即时分子检测技术及其在微生物耐药检测中的应用进行综述.

  4. Linear time algorithms for finding sparsest cuts in various graph classes

    NARCIS (Netherlands)

    Bonsma, Paul S.

    2007-01-01

    [S, S] denotes the set of edges with exactly one end vertex in S. The density of an edge cut [S, S] is |[S, S]|/(|S||S|). A sparsest cut is an edge cut with minimum density. We characterize the sparsest cuts for unit interval graphs, complete bipartite graphs and cactus graphs. For all of these clas

  5. Decrease of FIB-induced lateral damage for diamond tool used in nano cutting

    Energy Technology Data Exchange (ETDEWEB)

    Wu, Wei [State Key Laboratory of Precision Measuring Technology and Instruments, Centre of MicroNano Manufacturing Technology, Tianjin University, Tianjin 300072 (China); Xu, Zongwei, E-mail: zongweixu@163.com [State Key Laboratory of Precision Measuring Technology and Instruments, Centre of MicroNano Manufacturing Technology, Tianjin University, Tianjin 300072 (China); Fang, Fengzhou, E-mail: fzfang@gmail.com [State Key Laboratory of Precision Measuring Technology and Instruments, Centre of MicroNano Manufacturing Technology, Tianjin University, Tianjin 300072 (China); Liu, Bing; Xiao, Yinjing; Chen, Jinping [State Key Laboratory of Precision Measuring Technology and Instruments, Centre of MicroNano Manufacturing Technology, Tianjin University, Tianjin 300072 (China); Wang, Xibin [School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081 (China); Liu, Hongzhong [State Key Laboratory for Manufacturing Systems Engineering, Xi’an Jiaotong University, Xi’an 710049 (China)

    2014-07-01

    Highlights: • We mainly aim to characterize and decrease the FIB-induced damage on diamond tool. • Raman and XPS methods were used to characterize the nanoscale FIB-induced damage. • Lower energy FIB can effectively lessen the FIB-induced damage on diamond tool. • The diamond tools’ performance was greatly improved after FIB process optimization. • 6 nm chip thickness of copper was achieved by diamond tool with 22 nm edge radius. - Abstract: Diamond cutting tools with nanometric edge radius used in ultra-precision machining can be fabricated by focused ion beam (FIB) technology. However, due to the nanoscale effects, the diamond tools performance and the cutting edge lifetime in nano cutting would be degraded because of the FIB-induced nanoscale lateral damage. In this study, the methods of how to effectively characterize and decrease the FIB-induced lateral damage for diamond tool are intensively studied. Based on the performance optimization diamond machining tools, the controllable chip thickness of less than 10 nm was achieved on a single-crystal copper in nano cutting. In addition, the ratio of minimum thickness of chip (MTC) to tool edge radius of around 0.3–0.4 in nano cutting is achieved. Methods for decreasing the FIB-induced damage on diamond tools and adding coolant during the nano cutting are very beneficial in improving the research of nano cutting and MTC. The nano cutting experiments based on the sharp and high performance of diamond tools would validate the nano cutting mechanisms that many molecular dynamic simulation studies have put forward and provide new findings for nano cutting.

  6. Technologies Taking Us There

    Energy Technology Data Exchange (ETDEWEB)

    Cotrell, Jason; Veers, Paul

    2015-09-29

    Keynote presentation at the Iowa State Wind Energy Symposium. This presentation examines several cutting-edge technologies and research being performed by the National Renewable Energy Laboratory that is helping achieve the U.S. Department of Energy's Wind Vision.

  7. Application of Laser Technology in Cutting Cable Insulating Materials%激光在电缆绝缘材料切割中的应用

    Institute of Scientific and Technical Information of China (English)

    蔡斌; 王忠峰; 徐婕

    2013-01-01

    The principle and characteristics of laser in cutting cable insulating materials are introduced. And comparison is done between laser cutting and traditional cutting and striping process for cable insulating materials. Taking the production of Z71 cable assembly as example, by using laser cutting technology, not only the qualification rate and work efficiency are increased, the producing cost is reduced, but also the hidden troubles of the damage of inner and outer conductor during cutting cable insulating materials are eliminated thoroughly. Thus the quality of cable assembly is improved fully.%介绍了激光切割电缆绝缘材料的工作原理和特点,并与传统的电缆绝缘材料切剥工艺进行了对比.以Z71电缆组件生产为例,采用激光切割技术后,不但提高了电缆组件的合格率和工作效率,降低了生产成本,还彻底消除了电缆绝缘材料切割时对内外导体的损伤隐患,全面提高了电缆组件的质量.

  8. Application of Laser Cutting Technology in Machining%激光切割工艺在机械加工中的应用

    Institute of Scientific and Technical Information of China (English)

    齐忠军; 李晓明; 王涛

    2014-01-01

    As a new processing technology of the information age, laser processing plays an increasingly important role in improving product quality, labor productivity, and reducing material consumption. This paper expounds the principle and classification of laser cut-ting, makes comparisons between laser cutting process and traditional cutting, and analyzes the application trend of laser cutting process-ing technique and its future development.%激光加工作为信息时代的新型加工工艺,在提高产品质量、提高劳动生产率、减少材料消耗等方面具有越来越重要的作用。阐述激光切割的原理与分类,对比激光切割工艺与传统切割工艺的不同,分析激光切割加工工艺的应用情况及发展趋势。

  9. A cactus theorem for end cuts

    CERN Document Server

    Evangelidou, Anastasia

    2011-01-01

    Dinits-Karzanov-Lomonosov showed that it is possible to encode all minimal edge cuts of a graph by a tree-like structure called a cactus. We show here that minimal edge cuts separating ends of the graph rather than vertices can be `encoded' also by a cactus. We apply our methods to finite graphs as well and we show that several types of cuts can be encoded by cacti.

  10. Fibre laser cutting stainless steel: Fluid dynamics and cut front morphology

    Science.gov (United States)

    Pocorni, Jetro; Powell, John; Deichsel, Eckard; Frostevarg, Jan; Kaplan, Alexander F. H.

    2017-01-01

    In this paper the morphology of the laser cut front generated by fibre lasers was investigated by observation of the 'frozen' cut front, additionally high speed imaging (HSI) was employed to study the fluid dynamics on the cut front while cutting. During laser cutting the morphology and flow properties of the melt film on the cut front affect cut quality parameters such as cut edge roughness and dross (residual melt attached to the bottom of the cut edge). HSI observation of melt flow down a laser cutting front using standard cutting parameters is experimentally problematic because the cut front is narrow and surrounded by the kerf walls. To compensate for this, artificial parameters are usually chosen to obtain wide cut fronts which are unrepresentative of the actual industrial process. This paper presents a new experimental cutting geometry which permits HSI of the laser cut front using standard, commercial parameters. These results suggest that the cut front produced when cutting medium section (10 mm thick) stainless steel with a fibre laser and a nitrogen assist gas is covered in humps which themselves are covered by a thin layer of liquid. HSI observation and theoretical analysis reveal that under these conditions the humps move down the cut front at an average speed of approximately 0.4 m/s while the covering liquid flows at an average speed of approximately 1.1 m/s, with an average melt depth at the bottom of the cut zone of approximately 0.17 mm.

  11. CUTTING TEMPERATURE OF CBN TOOLS WHEN MACHINING STEEL OF MEDIUM HARDNESS

    Institute of Scientific and Technical Information of China (English)

    1998-01-01

    The cutting temperature of CBN tools when machining hardened steel was investigated at different cutting regime and cutting tool geometry. An unusual phenomenon that the depth of cut influenced the temperature more significantly than the feed rate was analysed via partial differentiation. A chamfered cutting edge generally raised the cutting temperature and the significance of the temperature increase was associated with the cutting speed.

  12. Cutting edge issues in primary sclerosing cholangitis.

    Science.gov (United States)

    Bowlus, Christopher L

    2011-10-01

    Primary sclerosing cholangitis (PSC) is a chronic inflammatory liver disease characterized by the destruction of medium- to large-sized bile ducts and intense concentric fibrosis. Complications from PSC include bacterial cholangitis, cirrhosis, and cholangiocarcinoma and a therapy that might alter the natural history of the disease remains lacking. Our understanding of the pathogenesis of PSC also remains rudimentary but the strong association between PSC and inflammatory bowel disease suggest causal links between the diseases. The male predominance in PSC, lack of a defined, pathogenic auto-antigen, and the potential role of the innate immune system suggest that PSC may be due to dysregulation of immunity rather than a classic autoimmune disease. However, PSC shares several genetic susceptibility loci with other autoimmune diseases including the human leukocyte antigen DRB01*03 haplotype. The precise immune response of PSC is largely unknown but likely involves activation of the innate immune system by bacterial components delivered to the liver via the portal vein. Induction of adhesion molecules and chemokines leads to the recruitment of intestinal lymphocytes. Bile duct injury results from the sustained inflammation and production of inflammatory cytokines. Biliary strictures may cause further damage as a result of bile stasis and recurrent secondary bacterial cholangitis. Progress in our basic understanding of PSC is desperately needed in order to rationally design new therapeutic approaches to this disease.

  13. On the cutting edge of robotic surgery.

    Science.gov (United States)

    Tabor, Wendy

    2007-02-01

    Joysticks meet scalpels in a new computer-enhanced surgery system. A new robotic surgical system is taking laparoscopic surgery to new horizons. With the potential for greater surgical precision, shorter hospital stays, and better patient outcomes, this minimally invasive surgical technique offers an exciting new option for many patients undergoing various surgical procedures. Read on to learn more about robotic surgery, including your role in patient care.

  14. Cosmetology: A Career on the Cutting Edge.

    Science.gov (United States)

    Mittelhauser, Mark

    1997-01-01

    Cosmetology presents a complicated labor market, consisting of many people entering and leaving the field. Employment opportunities seem to be plentiful, but cosmetology is characterized by low earnings and an unusually high proportion of part-time jobs. (JOW)

  15. WCCC's Cutting-Edge Cosmetology Program

    Science.gov (United States)

    Allen, Peg

    2008-01-01

    This article describes how a relatively small southwest Ohio career and technical education (CTE) school is making a big impression on students, their future employees, and the industry with its near 100 percent passage rate of the Ohio Board of Cosmetology exam every year and a matching placement rate. With a mission to prepare youths and adults…

  16. On the Cutting Edge with Gene Splicing.

    Science.gov (United States)

    Ehrman, Patrick; Fritz, Lucie

    1989-01-01

    Describes a program in which second-year biology students use plasmid isolation to remove DNA from Escherichia coli bacteria and subsequently ligate and transform it into other E. coli bacteria. Cites ways teachers can get involved in current research that allows student participation. (RT)

  17. Self-Determination and Disclosure. Cutting Edge.

    Science.gov (United States)

    Deschamps, Ann

    2001-01-01

    The disclosure provisions of the Americans with Disabilities Act raise issues for persons with hidden disabilities in the workplace and classroom regarding if, when, and how much to disclose. Educators should prepare students to address the disclosure issue and secure the accommodations they need. (SK)

  18. Cutting edge issues in rheumatic fever.

    Science.gov (United States)

    Chang, Christopher

    2012-04-01

    Although the incidence of acute rheumatic fever and rheumatic heart disease has decreased significantly in regions of the world where antibiotics are easily accessible, there remains a high incidence in developing nations as well as in certain regions where there is a high incidence of genetic susceptibility. These diseases are a function of poverty, low socioeconomic status, and barriers to healthcare access, and it is in the developing world that a comprehensive prevention program is most critically needed. Development of group A streptococcal vaccines has been under investigation since the 1960s and 50 years later, we still have no vaccine. Factors that contribute to this lack of success include a potential risk for developing vaccine-induced rheumatic heart disease, as well as difficulties in covering the many serological subtypes of M protein, a virulence factor found on the surface of the bacterium. Yet, development of a successful vaccine program for prevention of group A streptococcal infection still offers the best chance for eradication of rheumatic fever in the twenty-first century. Other useful approaches include continuation of primary and secondary prevention with antibiotics and implementation of health care policies that provide patients with easy access to antibiotics. Improved living conditions and better hygiene are also critical to the prevention of the spread of group A streptococcus, especially in impoverished regions of the world. The purpose of this article is to discuss current and recent developments in the diagnosis, pathogenesis, and management of rheumatic fever and rheumatic heart disease.

  19. Science versus News: On the Cutting Edge

    Science.gov (United States)

    Kinney, A. L.; French, V.; Villard, R.; Maran, S. P.

    1998-12-01

    This session is to aid communication between scientists and journalists, to motivate astronomers to be active in communicating their science to the public via the press, and to help both astronomers and journalists to understand the constraints under which the other group is operating. The session consists of two talks of about 20 minutes, followed by a panel discussion. The first talk is "What Makes a Topic News?" This segment, by Miles O'Brien of CNN News, takes the AAS audiences behind the scenes in the world of producing science news stories. --- What drives selection of assignments? How does the science reporter convince their editor to cover a story? What factors about television producing help and also hurt getting science subjects across to the public? The second talk is "Public Knowledge on Science: The Growing Gap Between Scientists and the Taxpayer." This presentation by Jon Miller, a public opinion expert will emphasize the problems scientists and society, face in communicating to the public. --- What does the public know about science and scientific method? How much translation is required to communicate with the public to engage their interest without unacceptable compromise of scientific accuracy? The final segment is a panel of both science journalists and astronomers moderated by Steve Maran. Together they will tackle a question that gets to the heart of the Science-Vs-News controversies, "When Should Results Go Public?" Published too soon, science is called "hype"; Published too late, it is no longer "news." Should all results be peer reviewed first, and is that a satisfactory prerequisite? Do scientists take self-serving advantage of the public interest by making announcements before results appear in journals? How do we address the public desire to experience science unfolding and to see real-time data such as planetary science missions? The panelists are Dr. David Helfand, from Columbia University, Dr. Bruce Margon, from the University of Washington, Mr. Thomas Siegfried, from The Dallas Daily News, Ms. Kathy Sawyer, from The Washington Post, Mr. John Noble Wilford from The New York Times, and Ms. Ann Kellan from CNN.

  20. New technology expected to increase sharpness, reduce prices of scalpels

    CERN Multimedia

    2002-01-01

    Earlier this year, MDW Technologies introduced a new blade sharpening method called Ultra-Quantum. By combining micro machining and high-energy physics, cutting edges can be manufactured with an edge radius as small as one billionth of an inch and should make surgical tools cheaper and more effective (1 paragraph).

  1. 切削参数智能生成技术研究%Research of Cutting Parameter Intelligence Generation Technology

    Institute of Scientific and Technical Information of China (English)

    胡贤金

    2012-01-01

    为提高先进制造装备的应用水平,在已有切削数据基础上如何自动生成更多的切削参数是一个重要但难以获得满意解决方案的课题.本文提出一种以基本切削数据库为基础综合利用多种人工智能技术,通过学习修正、记忆、实时生成对实际加工环境具有广泛适应能力的最佳切削参数的新方法.以回归分析和BP神经网络为例进行了阐述,并给出了具体实例.%It is an important issue that automatically generating more cutting parameters for improving operating level of the advanced manufacturing equipment. A new method, which is used to generate optimum cutting parameter to adapt the concret cutting environment, is presented. The principle of this method is comprehensive utilization multiple artificial intelligent technique based on the basic cutting database to select cutter and yield the cutting parameter, according to the machining status, if necessary, it can regenerate the new optimum parameter adapting the technical requirements through learning, correction and memory. It devotes regression analysis and back propagation neural networks to the subject, and gives instantiations.

  2. DEVELOPMENTAND FIRST TESTS OF AN AUTOMATIC SYSTEM FOR COMMERCIAL VINE CUTTING TRANSPLANTERS BASED ON DGPS-RTK TECHNOLOGY

    Directory of Open Access Journals (Sweden)

    Fabrizio Mazzetto

    2009-06-01

    Full Text Available The aim of this paper is the proposal of an innovative system for commercial transplanter to allow the automatic point-laying location of each vine cutting, without any kind of field preliminary squaring. A DGPS-RTK system is able to calculate the vine cutting location according to the project values; the transplant operation, carried out by electro-hydraulic and electro-mechanical components, is completely automated. The goal is to increase the work rate of the transplanting equipment and reduce the necessary skilled labour, without losing the accuracy of the vineyard planting.

  3. Handbook of manufacturing engineering and technology

    CERN Document Server

    2015-01-01

    The Springer Reference Work Handbook of Manufacturing Engineering and Technology provides overviews and in-depth and authoritative analyses on the basic and cutting-edge manufacturing technologies and sciences across a broad spectrum of areas. These topics are commonly encountered in industries as well as in academia. Manufacturing engineering curricula across universities are now essential topics covered in major universities worldwide.

  4. Development of a high speed cutting and pressure rolling technology for recycling of refrigerators with recovery of the fluorocarbon gas

    Energy Technology Data Exchange (ETDEWEB)

    Yotsumoto, M; Matsuda, Y. [Panasonic AVC Networks Co., (Japan)]|[Matsushita Electric Industrial Co. Ltd. (Japan)

    2004-07-01

    Refrigerators having reached end-of-life are a prime target for recycling because of their bulk and the relatively pristine condition of their components. This article reports on an innovative method of recycling these appliances. Conventional recycling relies on bulk crushing and then separation by magnetic, eddy current and possibly gravity methods. Separation of plastics by type is poor and the steel is often contaminated by copper. This innovative method replaces bulk crushing by high speed impact cutting, which cuts the metal-polymer-matrix composite material of the body into smaller parts (e.g. the walls, the door) of rectangular form. This is done by robots suitably controlled by sophisticated software which uses camera images as input, so that suitable pieces are precisely cut. High pressure rolling then liberates the cut plates of composite material into its constituent materials. The rolling process ruptures the polyurethane foam releasing the gas inside its unit cells. The gases traditionally used were fluorocarbons, but now flammable butane and cyclopentane is often used. The rolling system includes a gas recovery system to prevent escape of these environmentally sensitive substances. 5 refs., 2 tabs., 9 figs.

  5. Wedge cutting of mild steel by CO 2 laser and cut-quality assessment in relation to normal cutting

    Science.gov (United States)

    Yilbas, B. S.; Karatas, C.; Uslan, I.; Keles, O.; Usta, Y.; Yilbas, Z.; Ahsan, M.

    2008-10-01

    In some applications, laser cutting of wedge surfaces cannot be avoided in sheet metal processing and the quality of the end product defines the applicability of the laser-cutting process in such situations. In the present study, CO 2 laser cutting of the wedge surfaces as well as normal surfaces (normal to laser beam axis) is considered and the end product quality is assessed using the international standards for thermal cutting. The cut surfaces are examined by the optical microscopy and geometric features of the cut edges such as out of flatness and dross height are measured from the micrographs. A neural network is introduced to classify the striation patterns of the cut surfaces. It is found that the dross height and out of flatness are influenced significantly by the laser output power, particularly for wedge-cutting situation. Moreover, the cut quality improves at certain value of the laser power intensity.

  6. High confinement and high density with stationary plasma energy and strong edge radiation cooling in the upgraded Torus Experiment for Technology Oriented Research (TEXTOR-94)

    Energy Technology Data Exchange (ETDEWEB)

    Messiaen, A.M.; Ongena, J.; Unterberg, B.; Boedo, J.; Fuchs, G.; Jaspers, R.; Konen, L.; Koslowski, H.R.; Mank, G.; Rapp, J.; Samm, U.; Vandenplas, P.E.; Van Oost, G.; Van Wassenhove, G.; Waidmann, G.; Weynants, R.R.; Wolf, G.H.; Bertschinger, G.; Bonheure, G.; Brix, M.; Dumortier, P.; Durodie, F.; Finken, K.H.; Giesen, B.; Hillis, D.; Hutteman, P.; Koch, R.; Kramer-Flecken, A.; Lyssoivan, A.; Mertens, P.; Pospieszczyk, A.; Post-Zwicker, A.; Sauer, M.; Schweer, B.; Schwelberger, J.; Telesca, G.; Tokar, M.Z.; Uhlemann, R.; Vervier, M.; Winter, J. [Laboratoire de Physique des Plasmas, Laboratorium voor Plasmafysica, Association EURATOM-Belgian State, Ecole Royale Militaire-B-1000 Brussels, Koninklijke Militaire School (Belgium)]|[Institut fuer Plasmaphysik, Forschungszentrum Juelich GmbH Association Euratom-KFA, D-52425 Juelich (Germany)]|[Fusion Energy Research Program, Mechanical Engineering Division, University of California at San Diego, La Jolla, California 92093 (United States)]|[FOM Instituut voor Plasmafysica Rijnhuizen Associatie FOM-EURATOM, Nieuwegein (The Netherlands)]|[Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 (United States)

    1997-05-01

    An overview of the results obtained so far for the radiative I-mode regime on the upgraded Torus Experiment for Technology Oriented Research (TEXTOR-94) [{ital Proceedings of the 16th IEEE Symposium on Fusion Engineering} (Institute of Electrical and Electronics Engineers, Piscataway, NJ, 1995), Vol. 1, p. 470] is given. This regime is obtained under quasistationary conditions with edge neon seeding in a pumped limiter tokamak with circular cross section. It combines high confinement and high {beta} (up to a normalized beta, {beta}{sub n}=2) with low edge q values (down to q{sub a}=2.8) and high density even above the Greenwald limit together with dominant edge radiative heat exhaust, and therefore shows promise for the future of fusion research. Bulk and edge properties of these discharges are described, and a detailed account is given of the energy and particle confinement and their scaling. Energy confinement scales linearly with density as for the nonsaturated Ohmic Neo-Alcator scaling, but the usual degradation with total power remains. No deleterious effects of the neon seeding on fusion reactivity and plasma stability have been observed. {copyright} {ital 1997 American Institute of Physics.}

  7. Cutting tool form compensation system and method

    Science.gov (United States)

    Barkman, W.E.; Babelay, E.F. Jr.; Klages, E.J.

    1993-10-19

    A compensation system for a computer-controlled machining apparatus having a controller and including a cutting tool and a workpiece holder which are movable relative to one another along a preprogrammed path during a machining operation utilizes a camera and a vision computer for gathering information at a preselected stage of a machining operation relating to the actual shape and size of the cutting edge of the cutting tool and for altering the preprogrammed path in accordance with detected variations between the actual size and shape of the cutting edge and an assumed size and shape of the cutting edge. The camera obtains an image of the cutting tool against a background so that the cutting tool and background possess contrasting light intensities, and the vision computer utilizes the contrasting light intensities of the image to locate points therein which correspond to points along the actual cutting edge. Following a series of computations involving the determining of a tool center from the points identified along the tool edge, the results of the computations are fed to the controller where the preprogrammed path is altered as aforedescribed. 9 figures.

  8. Cutting tool form compensaton system and method

    Science.gov (United States)

    Barkman, William E.; Babelay, Jr., Edwin F.; Klages, Edward J.

    1993-01-01

    A compensation system for a computer-controlled machining apparatus having a controller and including a cutting tool and a workpiece holder which are movable relative to one another along a preprogrammed path during a machining operation utilizes a camera and a vision computer for gathering information at a preselected stage of a machining operation relating to the actual shape and size of the cutting edge of the cutting tool and for altering the preprogrammed path in accordance with detected variations between the actual size and shape of the cutting edge and an assumed size and shape of the cutting edge. The camera obtains an image of the cutting tool against a background so that the cutting tool and background possess contrasting light intensities, and the vision computer utilizes the contrasting light intensities of the image to locate points therein which correspond to points along the actual cutting edge. Following a series of computations involving the determining of a tool center from the points identified along the tool edge, the results of the computations are fed to the controller where the preprogrammed path is altered as aforedescribed.

  9. Cutting assembly

    Science.gov (United States)

    Racki, Daniel J.; Swenson, Clark E.; Bencloski, William A.; Wineman, Arthur L.

    1984-01-01

    A cutting apparatus includes a support table mounted for movement toward and away from a workpiece and carrying a mirror which directs a cutting laser beam onto the workpiece. A carrier is rotatably and pivotally mounted on the support table between the mirror and workpiece and supports a conduit discharging gas toward the point of impingement of the laser beam on the workpiece. Means are provided for rotating the carrier relative to the support table to place the gas discharging conduit in the proper positions for cuts made in different directions on the workpiece.

  10. Bone cutting.

    Science.gov (United States)

    Giraud, J Y; Villemin, S; Darmana, R; Cahuzac, J P; Autefage, A; Morucci, J P

    1991-02-01

    Bone cutting has always been a problem for surgeons because bone is a hard living material, and many osteotomes are still very crude tools. Technical improvement of these surgical tools has first been their motorization. Studies of the bone cutting process have indicated better features for conventional tools. Several non-conventional osteotomes, particularly ultrasonic osteotomes are described. Some studies on the possible use of lasers for bone cutting are also reported. Use of a pressurised water jet is also briefly examined. Despite their advantages, non-conventional tools still require improvement if they are to be used by surgeons.

  11. Long Progression and Cover Type on Cross-measure Cutting Coal Technology%长距离递进掩护式石门揭煤技术

    Institute of Scientific and Technical Information of China (English)

    聂政

    2012-01-01

    基于FLAC数值模拟软件对石门揭煤过程中距离煤层不同位置处工作面前面的应力分析结果,确定出掘进工作面前方应力集中范围,由此确定出距离煤层不同位置时应采取的防突措施,以海孜煤矿Ⅲ1采区石门揭煤为背景,对长距离石门揭煤技术进行了研究。%According to the stress analysis results in front of the the coal face about different location from coal seam during the process of cross-measure cutting coal by using FLAC numerical simulation software.The paper determined the range of stress concentration in front of drivage face,determined the different outburst prevention measures which should be taken.And then take the cross-measure cutting coal in Ⅲ1 Haizi coal mine as the background,this paper studied the cross-measure cutting coal technology.

  12. 硬质合金孔加工刀具的技术进展%Technical Development of Cemented Carbide Cutting Tools for Hole Machining

    Institute of Scientific and Technical Information of China (English)

    王弢; 柯亚仕; 周一丹

    2011-01-01

    The types of cutting tools for hole machining commonly used in modem manufacturing techniques, carbide cutting tool materials and preparations were introduced briefly. Taking drill as an example, the influences of tool parameters design, edge grinding and cutting edge preparation technology on cutting performance were analyzed. The developing trends of cemented carbide cutting tools for hole machining were summarized.%简要介绍了现代制造技术中常用孔加工刀具的种类、硬质合金刀具的材料与制备.以钻头为例,分析了刀具参数、刃磨、刃口钝化技术对切削性能的影响,综述了硬质合金孔加工刀具技术的发展趋势.

  13. NREL's Energy-Saving Technology for Air Conditioning Cuts Peak Power Loads Without Using Harmful Refrigerants (Fact Sheet)

    Energy Technology Data Exchange (ETDEWEB)

    2012-07-01

    This fact sheet describes how the DEVAP air conditioner was invented, explains how the technology works, and why it won an R&D 100 Award. Desiccant-enhanced evaporative (DEVAP) air-conditioning will provide superior comfort for commercial buildings in any climate at a small fraction of the electricity costs of conventional air-conditioning equipment, releasing far less carbon dioxide and cutting costly peak electrical demand by an estimated 80%. Air conditioning currently consumes about 15% of the electricity generated in the United States and is a major contributor to peak electrical demand on hot summer days, which can lead to escalating power costs, brownouts, and rolling blackouts. DEVAP employs an innovative combination of air-cooling technologies to reduce energy use by up to 81%. DEVAP also shifts most of the energy needs to thermal energy sources, reducing annual electricity use by up to 90%. In doing so, DEVAP is estimated to cut peak electrical demand by nearly 80% in all climates. Widespread use of this cooling cycle would dramatically cut peak electrical loads throughout the country, saving billions of dollars in investments and operating costs for our nation's electrical utilities. Water is already used as a refrigerant in evaporative coolers, a common and widely used energy-saving technology for arid regions. The technology cools incoming hot, dry air by evaporating water into it. The energy absorbed by the water as it evaporates, known as the latent heat of vaporization, cools the air while humidifying it. However, evaporative coolers only function when the air is dry, and they deliver humid air that can lower the comfort level for building occupants. And even many dry climates like Phoenix, Arizona, have a humid season when evaporative cooling won't work well. DEVAP extends the applicability of evaporative cooling by first using a liquid desiccant-a water-absorbing material-to dry the air. The dry air is then passed to an indirect

  14. Cross Cutting Relative Navigation Technologies for Improved Landing Accuracy and Vehicle-to-Vehicle Rendezvous and Docking

    Science.gov (United States)

    Miller, K. L.; Masciarelli, J.; Rohrschneider, R. R.

    2012-06-01

    This presentation addresses recent development and test progress, as well as future technology advancement plans for precision landing and Autonomous Rendezvous, Proximity Operations and Docking (ARPOD).

  15. Automated Laser Cutting In Three Dimensions

    Science.gov (United States)

    Bird, Lisa T.; Yvanovich, Mark A.; Angell, Terry R.; Bishop, Patricia J.; Dai, Weimin; Dobbs, Robert D.; He, Mingli; Minardi, Antonio; Shelton, Bret A.

    1995-01-01

    Computer-controlled machine-tool system uses laser beam assisted by directed flow of air to cut refractory materials into complex three-dimensional shapes. Velocity, position, and angle of cut varied. In original application, materials in question were thermally insulating thick blankets and tiles used on space shuttle. System shapes tile to concave or convex contours and cuts beveled edges on blanket, without cutting through outer layer of quartz fabric part of blanket. For safety, system entirely enclosed to prevent escape of laser energy. No dust generated during cutting operation - all material vaporized; larger solid chips dislodged from workpiece easily removed later.

  16. ADVANCED CUTTINGS TRANSPORT STUDY

    Energy Technology Data Exchange (ETDEWEB)

    Troy Reed; Stefan Miska; Nicholas Takach; Kaveh Ashenayi; Mark Pickell; Len Volk; Mike Volk; Evren Ozbayoglu; Lei Zhou

    2002-07-30

    This is the fourth quarterly progress report for Year-3 of the ACTS Project. It includes a review of progress made in: (1) Flow Loop construction and development and (2) research tasks during the period of time between April 1, 2002 and June 30, 2002. This report presents a review of progress on the following specific tasks: (a) Design and development of an Advanced Cuttings Transport Facility (Task 3: Addition of a Cuttings Injection/Separation System), (b) Research project (Task 6): ''Study of Cuttings Transport with Foam Under LPAT Conditions (Joint Project with TUDRP)''; (c) Research project (Task 9b): ''Study of Foam Flow Behavior Under EPET Conditions''; (d) Research project (Task 10): ''Study of Cuttings Transport with Aerated Mud Under Elevated Pressure and Temperature Conditions''; (e) Research on three instrumentation tasks to measure: Cuttings concentration and distribution in a flowing slurry (Task 11), Foam texture while transporting cuttings. (Task 12), and Viscosity of Foam under EPET (Task 9b); (f) Development of a Safety program for the ACTS Flow Loop. Progress on a comprehensive safety review of all flow-loop components and operational procedures. (Task 1S); (g) Activities towards technology transfer and developing contacts with Petroleum and service company members, and increasing the number of JIP members.

  17. ADVANCED CUTTINGS TRANSPORT STUDY

    Energy Technology Data Exchange (ETDEWEB)

    Troy Reed; Stefan Miska; Nicholas Takach; Kaveh Ashenayi; Mark Pickell; Len Volk; Mike Volk; Lei Zhou; Zhu Chen; Crystal Redden; Aimee Washington

    2003-01-30

    This is the second quarterly progress report for Year-4 of the ACTS Project. It includes a review of progress made in: (1) Flow Loop construction and development and (2) research tasks during the period of time between October 1, 2002 and December 30, 2002. This report presents a review of progress on the following specific tasks. (a) Design and development of an Advanced Cuttings Transport Facility Task 3: Addition of a Cuttings Injection/Separation System, Task 4: Addition of a Pipe Rotation System. (b) New research project (Task 9b): ''Development of a Foam Generator/Viscometer for Elevated Pressure and Elevated Temperature (EPET) Conditions''. (d) Research project (Task 10): ''Study of Cuttings Transport with Aerated Mud Under Elevated Pressure and Temperature Conditions''. (e) Research on three instrumentation tasks to measure: Cuttings concentration and distribution in a flowing slurry (Task 11), Foam texture while transporting cuttings. (Task 12), and Viscosity of Foam under EPET (Task 9b). (f) New Research project (Task 13): ''Study of Cuttings Transport with Foam under Elevated Pressure and Temperature Conditions''. (g) Development of a Safety program for the ACTS Flow Loop. Progress on a comprehensive safety review of all flow-loop components and operational procedures. (Task 1S). (h) Activities towards technology transfer and developing contacts with Petroleum and service company members, and increasing the number of JIP members.

  18. Cutting Cosmos

    DEFF Research Database (Denmark)

    Mikkelsen, Henrik Hvenegaard

    The foundation for this book is an ethnographic study of masculinity in a Bugkalot village in northern Philippines. While offering new research on the Bugkalot, widely known as the Ilongot, more than 30 years after the last important works were written on this famous hill-people, Cutting Cosmos...... into egalitarian relations. Cutting Cosmos shows how these seemingly opposed characteristics of male life - the egalitarianism and the assertive ideals - are interwoven. Acts of dominance are presented as acts of transgression that are persistently ritualized, contained and isolated as spectacular events within...

  19. Analysis of fabric materials cut using ultraviolet laser ablation

    Science.gov (United States)

    Tsai, Hsin-Yi; Yang, Chih-Chung; Hsiao, Wen-Tse; Huang, Kuo-Cheng; Andrew Yeh, J.

    2016-04-01

    Laser ablation technology has widely been applied in the clothing industry in recent years. However, the laser mechanism would affect the quality of fabric contours and its components. Hence, this study examined carbonization and oxidation conditions and contour variation in nonwoven, cotton, and composite leather fabrics cut by using an ultraviolet laser at a wavelength of 355 nm. Processing parameters such as laser power, pulse frequency, scanning speed, and number of pulses per spot were adjusted to investigate component variation of the materials and to determine suitable cutting parameters for the fabrics. The experimental results showed that the weights of the component changed substantially by pulse frequency but slightly by laser power, so pulse frequency of 100 kHz and laser power of 14 W were the approximate parameters for three fabrics for the smaller carbonization and a sufficient energy for rapidly cutting, which the pulse duration of laser system was fixed at 300 μs and laser irradiance was 0.98 J/mm2 simultaneously. In addition, the etiolate phenomenon of nonwoven was reduced, and the component weight of cotton and composite leather was closed to the value of knife-cut fabric as the scanning speed increased. The approximate scanning speed for nonwoven and composite leather was 200 mm/s, and one for cotton was 150 mm/s, respectively. The sharper and firmer edge is obtained by laser ablation mechanism in comparison with traditional knife cutting. Experimental results can serve as the reference for laser cutting in the clothing industry, for rapidly providing smoother patterns with lower carbonization and oxidation edge in the fashion industry.

  20. INVESTIGATION SURFACE ROUGHNESS AND CHARACTERIZATION OF CUTTING FRONT SIDE GEOMETRY IN THE CUTTING OF AISI 1030 MATERIAL WITH ABRASIVE WATER JET

    Directory of Open Access Journals (Sweden)

    Adnan AKKURT

    2009-01-01

    Full Text Available Abrasive water jet (AWJ is used as a new and alternative cutting technique in industry to form the materials that are hard to cut. In this study, AISI 1030 steel samples in different thickness were cut with AWJ process. The samples were cut with different cutting speeds. The effect of cutting speed on the surface characteristics was investigated. The results of the study show that AWJ can be used as an effective cutting process to form sharp corners and edges.

  1. The University of Kansas High-Throughput Screening Laboratory. Part II: enabling collaborative drug-discovery partnerships through cutting-edge screening technology.

    Science.gov (United States)

    McDonald, Peter R; Roy, Anuradha; Chaguturu, Rathnam

    2011-07-01

    The University of Kansas High-Throughput Screening (KU HTS) core is a state-of-the-art drug-discovery facility with an entrepreneurial open-service policy, which provides centralized resources supporting public- and private-sector research initiatives. The KU HTS core was established in 2002 at the University of Kansas with support from an NIH grant and the state of Kansas. It collaborates with investigators from national and international academic, nonprofit and pharmaceutical organizations in executing HTS-ready assay development and screening of chemical libraries for target validation, probe selection, hit identification and lead optimization. This is part two of a contribution from the KU HTS laboratory.

  2. Design and construction of latest generation cluster wells for heavy oil, using cutting edge technology and best practices in project implementation

    Energy Technology Data Exchange (ETDEWEB)

    Garcia, A.; Brunings, C.; Contreras, G. [PDVSA (Venezuela)

    2011-07-01

    Venezuela has the largest hydrocarbon accumulation in the world in its eastern part - the Faja Petrolifera del Orinoco. PDVSA is exploiting these reserves and given the need to optimize performance, they decided to implement a project named, {sup L}atest Generation Cluster{sup .} This project will aim at standardizing engineering criteria with a view to employing the best known methods available on the market. A multidisciplinary team will then be formed to ensure that all organizations involved are working together, including risk management, and a representative of each organization will report to the Project manager. The implementation of this model cluster is designed to ensure the project's success and bring flexibility to the project so it can adapt to different areas of the oil field. The project presented herein is based on a model cluster designed to ensure optimal project performance through everyone's participation.

  3. NANOSCALE CUTTING OF MONOCRYSTALLINE SILICON USING MOLECULAR DYNAMICS SIMULATION

    Institute of Scientific and Technical Information of China (English)

    LI Xiaoping; CAI Minbo; RAHMAN Mustafizur

    2007-01-01

    It has been found that the brittle material, monocrystalline silicon, can be machined in ductile mode in nanoscale cutting when the tool cutting edge radius is reduced to nanoscale and the undeformed chip thickness is smaller than the tool edge radius. In order to better understand the mechanism of ductile mode cutting of silicon, the molecular dynamics (MD) method is employed to simulate the nanoscale cutting of monocrystalline silicon. The simulated variation of the cutting forces with the tool cutting edge radius is compared with the cutting force results from experimental cutting tests and they show a good agreement. The results also indicate that there is silicon phase transformation from monocrystalline to amorphous in the chip formation zone that can be used to explain the cause of ductile mode cutting. Moreover, from the simulated stress results, the two necessary conditions of ductile mode cutting, the tool cutting edge radius are reduced to nanoscale and the undeformed chip thickness should be smaller than the tool cutting edge radius, have been explained.

  4. Integrated interconnect technologies for 3D nanoelectronic systems

    CERN Document Server

    Bakir, Muhannad S

    2008-01-01

    This cutting-edge book on off-chip technologies puts the hottest breakthroughs in high-density compliant electrical interconnects, nanophotonics, and microfluidics at your fingertips, integrating the full range of mathematics, physics, and technology issues together in a single comprehensive source.

  5. Augmented Reality as a Visual and Spatial Learning Tool in Technology Education

    Science.gov (United States)

    Thornton, Timothy; Ernst, Jeremy V.; Clark, Aaron C.

    2012-01-01

    Improvement in instructional practices through dynamic means of delivery remains a central consideration to technology educators. To help accomplish this, one must constantly utilize contemporary and cutting-edge technological applications in attempts to provide a more beneficial learning experience for students. These technologies must…

  6. Augmented Reality as a Visual and Spatial Learning Tool in Technology Education

    Science.gov (United States)

    Thornton, Timothy; Ernst, Jeremy V.; Clark, Aaron C.

    2012-01-01

    Improvement in instructional practices through dynamic means of delivery remains a central consideration to technology educators. To help accomplish this, one must constantly utilize contemporary and cutting-edge technological applications in attempts to provide a more beneficial learning experience for students. These technologies must…

  7. Influence of the Magnetic High-speed Steel Cutting Tool on Cutting Capability

    Institute of Scientific and Technical Information of China (English)

    2002-01-01

    The high-speed steel cutting tool has advantaged i n modern cutting tool for its preferable synthetical performance, especially, in a pplication of complicated cutting tools. Therefore, the study of the high-speed steel cutting tools that occupied half of cutting tools has become an importa nt way of studying on modern cutting technology. The cutting performance of hi gh speed-steel cutting tools will be improved by magnetization treating method. Microstructure of high-speed steel will be changed as a ...

  8. Research on Knowledge Networks Edge Locking and Encoding Technology of Inter- organization%跨组织知识网边界锁定及编码机理

    Institute of Scientific and Technical Information of China (English)

    孙中桥; 陈菊红

    2011-01-01

    利用边界锁定技术对知识网进行研究.通过对跨组对织知识边界及形成机理的分析,得出知识网结构模型,在知识边界锁定的基础上,利用编码技术,初步研究跨组织知识网编码方法,从而为实现基于Internet的跨组织知识共享及协同工作准备了技术基础,同时也为大规模的科学知识研究层次化、权限化、模块化、集成化、信息化以及科学研究的一致性和动态更新及维护提供方法.%Knowledge network was studied by using edge locking technology in this paper. Through analyzing the knowl edge boundary and formation mechanism of the inter-organization, the paper obtained knowledge networks structure mod el. On the foundation of the knowledge edge locking, the knowledge network coding method of inter - organization was stud ied by using encoding technology. As a result, the technical bases of knowledge sharing and cooperation of inter - organiza tion were prepared to realize the E - knowledge networks. Meanwhile, a useful method for large - scale of ranklized, per missionlized, modularized, synchronized, informationalized scientific knowledge research was provided for consistency, dy namic update and maintenance of scientific research.

  9. 天然林采伐迹地不炼山造林技术%Non-burning afforestation technology in cutting-blank of natural forest

    Institute of Scientific and Technical Information of China (English)

    邓建滨

    2012-01-01

    The afforestation practices of non-burning and cleaning out mix plants were carried out in cutting-blank of natural forest by using the conventional praetiee as control. The results showed that the non-burning afforestation had significant eco- nomic, ecological and social benefits and was simple, practical and easy to be mastered by producers. So this technology could be popularized in the cutting-blanks of natural eoniferous-broadleaf forest, and the controlled-burning afforestation practice should be forbidden.%在天然林林分采伐迹地采用不炼山清杂办法清理迹地进行造林生产,并与常规的炼山造林进行比较,结果表明:不炼山造林不仅具有明显的经济效益、生态效益和社会效益,而且在技术上简单实用,林业生产者容易掌握。建议在永安市内天然针阔叶混交林采伐迹地推广不炼山造林技术,并杜绝炼山造林。

  10. Process parameters effect on material removal mechanism and cut quality of abrasive water jet machining

    Directory of Open Access Journals (Sweden)

    Janković P.

    2013-01-01

    Full Text Available The process of the abrasive water jet cutting of materials, supported by the theories of fluid mechanics, abrasive wear and damage mechanics, is a high-tech technologies that provides unique capabilities compared to conventional machining processes. This paper, along the theoretical derivations, provides original contributions in the form of mathematical models of the quantity of the cut surface damage, expressed by the values of cut surface roughness. The particular part of this paper deal with the results of the original experimental research. The research aim was connected with the demands of industry, i.e. the end user. Having in mind that the conventional machining processes are not only lagging behind in terms of quality of cut, or even some requests are not able to meet, but with the advent of composite materials were not able to machine them, because they occurred unacceptable damage (mechanical damage or delamination, fiber pull-out, burning, frayed edges.

  11. New technology for scale squeeze treatments on high water cut wells on Statoil Heidrun and Norne fields

    Energy Technology Data Exchange (ETDEWEB)

    Sim, Michael; Heath, Steve; Selle, Olav M.; Haavind, Frode; Springer, Martin; Auflem, Inge H.; Clark, Graham; Strachan, Catherine; Oedegaard, Bent

    2006-03-15

    The Heidrun and Norne fields are located in the Haltenbanken area offshore Mid-Norway. The reservoir temperatures are 85 deg-88 deg C and 98 deg C respectively, and the reservoir pressure is close to hydrostatic pressure of approx. 250Bar for both fields. Seawater injection is utilised on both Heidrun and Norne to maintain reservoir support and with Ba levels averaging 80-90ppm and 200-300ppm in the Norne and Heidrun formation brines, moderate to harsh barium sulphate scale challenges have been identified. The barium sulphate scale challenge has been routinely controlled by the use of aqueous based scale squeeze treatments. However, on high water cut and low reservoir pressure wells, lifting problems have been encountered post squeeze treatments. Hybrid treatments with diesel pre-flush and over flush have been slow in returning the wells to full production post squeeze treatment. The challenge was therefore to develop a low-density scale inhibitor (less than 0.94) that will aid well re-start post squeeze treatment. This product would also need to be environmentally friendly, compatible with produced fluids and non-emulsifying, be effectively retained and released, and provide a good level of inhibition against barium sulphate scale. This paper will highlight the details of the laboratory development of the low-density scale inhibitor and, in addition, will present details of the deployment of the low density product in wells with lifting problems on Heidrun and Norne. (Author) (tk)

  12. An appraisal of techniques and equipment for cutting force measurement

    Institute of Scientific and Technical Information of China (English)

    AUDY J.

    2006-01-01

    Current research focussed on the assessment of metal machining process parameters and on the development of adaptive control, shows that machine performance, work-piece and tool material selections, tool life, quality of machined surfaces,the geometry of cutting tool edges, and cutting conditions are closely related to the cutting forces. This information is of great interest to cutting tool manufactures and users alike. Over the years there have been significant developments and improvements in the equipment used to monitor such forces. In 1930 mechanical gauges were replaced by resistance strain gauges, and some 30 years later compact air gauge dynamometers were invented. Since this time intensive research has continued being directed towards developing new approaches to cutting force measurement. The Kistler Company, well-known manufacturer of acceleration and piezoelectrical dynamometers, has worked in this field for more than three decades, and developed very sensitive devices.While leading manufacturing research laboratories are often equipped with this technology, classical electrical strain gauges and other dynamometers of individual designs are still commonly used in industry. The present paper presents data obtained using different techniques of force measurement in metal machining processes. In particular, areas of uncertainties, illustrated through results concerning the turning process, are analysed, leading to an appraisal of the current status of these measurements and their significance.

  13. 2010 Mississippi Curriculum Framework: Postsecondary Meat Merchandising Technology. (Program CIP: 12.0506 - Meat Cutting/Meat Cutter)

    Science.gov (United States)

    Jones, Roger; Currie, Lamar; Clayton, Sheila

    2010-01-01

    As the world economy continues to evolve, businesses and industries must adopt new practices and processes in order to survive. Quality and cost control, work teams and participatory management, and an infusion of technology are transforming the way people work and do business. Employees are now expected to read, write, and communicate…

  14. 2007 Mississippi Curriculum Framework: Postsecondary Meat Merchandising Technology (Program CIP: 12.0506 - Meat Cutting/Meat Cutter)

    Science.gov (United States)

    Jones, Roger; Currie, Lamar; Clayton, Sheila

    2007-01-01

    As the world economy continues to evolve, businesses and industries must adopt new practices and processes in order to survive. Quality and cost control, work teams and participatory management, and an infusion of technology are transforming the way people work and do business. Employees are now expected to read, write, and communicate…

  15. ADVANCED CUTTINGS TRANSPORT STUDY

    Energy Technology Data Exchange (ETDEWEB)

    Troy Reed; Stefan Miska; Nicholas Takach; Kaveh Ashenayi; Mark Pickell; Len Volk, Mike Volk; Lei Zhou; Zhu Chen; Crystal Redden; Aimee Washington

    2002-10-30

    This is the first quarterly progress report for Year-4 of the ACTS Project. It includes a review of progress made in: (1) Flow Loop construction and development and (2) research tasks during the period of time between July 1, 2002 and Sept. 30, 2002. This report presents a review of progress on the following specific tasks: (a) Design and development of an Advanced Cuttings Transport Facility Task 3: Addition of a Cuttings Injection/Separation System, Task 4: Addition of a Pipe Rotation System, (b) New Research project (Task 9b): ''Development of a Foam Generator/Viscometer for Elevated Pressure and Elevated Temperature (EPET) Conditions'', (d) Research project (Task 10): ''Study of Cuttings Transport with Aerated Mud Under Elevated Pressure and Temperature Conditions'', (e) Research on three instrumentation tasks to measure: Cuttings concentration and distribution in a flowing slurry (Task 11), Foam texture while transporting cuttings (Task 12), Viscosity of Foam under EPET (Task 9b). (f) Development of a Safety program for the ACTS Flow Loop. Progress on a comprehensive safety review of all flow-loop components and operational procedures. (Task 1S). (g) Activities towards technology transfer and developing contacts with Petroleum and service company members, and increasing the number of JIP members.

  16. Mechanism of Transition-Metal Nanoparticle Catalytic Graphene Cutting.

    Science.gov (United States)

    Ma, Liang; Wang, Jinlan; Yip, Joanne; Ding, Feng

    2014-04-03

    Catalytic cutting by transition-metal (TM) particles is a promising method for the synthesizing of high-quality graphene quantum dots and nanoribbons with smooth edges. Experimentally, it is observed that the cutting always results in channels with zigzag (ZZ) or armchair (AC) edges. However, the driving force that is responsible for such a cutting behavior remains a puzzle. Here, by calculating the interfacial formation energies of the TM-graphene edges with ab initio method, we show that the surface of a catalyst particle tends to be aligned along either AC or ZZ direction of the graphene lattice, and thus the cutting of graphene is guided as such. The different cutting behaviors of various catalysts are well-explained based on the competition between TM-passivated graphene edges and the etching-agent-terminated ones. Furthermore, the kinetics of graphene catalytic cutting along ZZ and AC directions, respectively, are explored at the atomic level.

  17. About TTC | NCI Technology Transfer Center | TTC

    Science.gov (United States)

    The National Cancer Institute’s Technology Transfer Center (TTC) facilitates partnerships between the NIH research laboratories and external partners, and helping to accelerate development of cutting-edge research by connecting our partners to NIH’s world-class facilities, resources, and discoveries. Contact us to learn more. | [google6f4cd5334ac394ab.html

  18. International Conference on Mobile and Wireless Technology

    CERN Document Server

    Wattanapongsakorn, Naruemon; Joukov, Nikolai

    2016-01-01

    This book presents the peer-reviewed contributions of ICMWT2016, an international conference devoted to mobile and wireless technology. Researchers and professionals from academia and industry met to discuss the cutting-edge developments in the field. The book includes papers on mobile and wireless networks, the increasingly important security issues, data management, as well as the latest developments in mobile software development.

  19. Laser Cutting of Leather: Tool for Industry or Designers?

    Science.gov (United States)

    Stepanov, Alexander; Manninen, Matti; Pärnänen, Inni; Hirvimäki, Marika; Salminen, Antti

    Currently technologies which are applied for leather cutting include slitting knifes, die press techniques and manual cutting. Use of laser technology has grown significantly during recent years due to number of advantages over conventional cutting methods; flexibility, high production speed, possibility to cut complex geometries, easier cutting of customized parts, and less leftovers of leather makes laser cutting more and more economically attractive to apply for leather cutting. Laser technology provides advantages in cutting complex geometries, stable cutting quality and possibility to utilize leather material in economically best way. Constant quality is important in industrial processes and laser technology fulfills this requirement: properly chosen laser cutting parameters provides identical cuts. Additionally, laser technology is very flexible in terms of geometries: complex geometries, individual designs, prototypes and small scale products can be manufactured by laser cutting. Variety of products, which needed to be cut in small volumes, is also the application where laser cutting can be more beneficial due to possibility to change production from one product to another only by changing geometry without a need to change cutting tool. Disadvantages of laser processing include high initial investment costs and some running costs due to maintenance and required gas supply for the laser. Higher level of operator's expertise is required due to more complicated machinery in case of laser cutting. This study investigates advantages and disadvantages of laser cutting in different areas of application and provides comparison between laser cutting and mechanical cutting of leather.

  20. Electrosurgical device for both mechanical cutting and coagulation of bleeding

    Energy Technology Data Exchange (ETDEWEB)

    Doss, J.D.; Mc Cabe, C.W.

    1987-03-24

    A surgical instrument is described for cutting and coagulating tissue, the surgical instrument comprising in combination: means for pressure cutting, the pressuring cutting means serving as a first electrode and having a leading edge and a cutting surface, the leading edge of the means for pressure cutting forming the forward portion of the cutting surface; second electrode means set apart from and electrically insulated from the pressure cutting means on the side of the pressure cutting means opposite the cutting surface thereof; means for attaching the second electrode means to the pressure cutting means; and means for providing a voltage between the pressure cutting means the second electrode means whereby an electric current can be made to flow between a portion of the side of the pressure cutting means opposite the cutting surface thereof and the second electrode means, and between the leading edge of the pressure cutting means and the second electrode means through tissue which is located therebetween. The current has sufficient amplitude to cause coagulation therein.

  1. 分层实体制造技术中激光切割路径的优化%Optimization of Laser Cutting Paths in Laminated Object Manufacturing Technology

    Institute of Scientific and Technical Information of China (English)

    刘斌; 阮锋; 黄树槐

    2001-01-01

    The laser cutting paths and cutting speed usually influence the cutting time of each layer in the laminated object manufacturing technology. If the cutting speed is not changed, the optimization of laser cutting paths will directly influence the cutting time of each layer. So, the method of optimization of laser cutting paths is discussed in detail in this paper. It will reduce some needless moving paths and shorten the displacement in order to improve the efficient of manufacturing.%在分层实体制造中,激光切割路径和切割速度影响每层的切割加工时间.在切割速度一定的情况下,激光切割路径的优化与否将直接影响每层的切割加工时间.本文对激光切割路径进行优化的方法,可以减少一些不必要的移动路径和缩短空行程位移,从而达到提高加工效率的目的

  2. Lumped Parameter experiments for Single Mode Fiber Laser Cutting of Thin Stainless Steel Plate

    Science.gov (United States)

    Lai, Shengying; Jia, Ye; Han, Bing; Wang, Jun; Liu, Zongkai; Ni, Xiaowu; Shen, Zhonghua; Lu, Jian

    2017-06-01

    The present work reports the parameters on laser cutting stainless steel including workpiece thickness, cutting speed, defocus length and assisting gas pressure. The cutting kerf width, dross attachment and cut edge squareness deviation are examined to provide information on cutting quality. The results show that with the increasing thickness, the cutting speed decrease rate is about 27%. The optimal ranges of cutting speed, defocus length and gas pressure are obtained with maximum quality. The first section in your paper

  3. Welding And Cutting A Nickel Alloy By Laser

    Science.gov (United States)

    Banas, C. M.

    1990-01-01

    Technique effective and energy-efficient. Report describes evaluation of laser welding and cutting of Inconel(R) 718. Notes that electron-beam welding processes developed for In-718, but difficult to use on large or complex structures. Cutting of In-718 by laser fast and produces only narrow kerf. Cut edge requires dressing, to endure fatigue.

  4. Increasing Fatigue Lives of Laser-Cut Parts

    Science.gov (United States)

    Glick, Edward W.; Donovan, Michael H.

    1987-01-01

    Cut edges sanded to restore strength. Simple abrasion process removes transverse striations resulting from laser cutting of inconel 718 or equivalent alloy, increasing fatigue strengths of parts cut by laser beams. For stresses in range of 80 to 130 ksi (550 to 900 MPa) high cycle fatigue strengths restored to levels comparable to conventionally machined parts.

  5. Edge Matters

    DEFF Research Database (Denmark)

    Earon, Ofri

    2013-01-01

    the building. The research explores and develops the architectural characteristics of correlations between the resident, the singular unit, the building and the given location at the edge zone. It approaches the edge zone of the urban house as a platform for dynamic interactions between these behaviours....... The following text includes the first draft of the first two chapters: introduction and theory. The chapters are not written completely, and some parts are written only as headlines. These headlines and other comments are marked in red. The text is on working progress and far from being finished...

  6. Living edge

    DEFF Research Database (Denmark)

    Earon, Ofri

    2014-01-01

    of the involved actors at the border. By doing so, the study underlines a forgotten, yet important, role of this edge zone – being a zone of commonality between the house and city, between indoors and outdoors, between the man at home and the man at the street. The city of Copenhagen promotes porous borders...... is a collection of material from the case study of an ongoing PhD study titled: LIVING EDGE - The Architectural and Urban Prospect of Domestic Borders. The paper includes a description of the problem analysis, research question, method, discussion and conclusion....

  7. Measurement of surface roughness and flank wear on hard martensitic stainless steel by CBN and PCBN cutting tools

    Directory of Open Access Journals (Sweden)

    S. Thamizhmanii

    2008-12-01

    Full Text Available Purpose: The experiments with different operating parameters using CBN and PCBN tools on hard AISI 440 C material were investigated in this paper.Design/methodology/approach: In this research AISI 440 C stainless was used under hard condition. The cutting tools are having three cutting edges and each edge repeated for 5 times. The test conducted by each cutting edge was termed as trail 1, 2, 3, 4 & 5. The length of cutting was 150 mm and each trail. The surface roughness and flank wear, crater wear and BUE were measured by SEM.Findings: The surface roughness was low by CBN at high turning cutting speed and the flank wear was high. The surface roughness was high by PCBN tool than CBN tool and flank wear recorded was low for PCBN tool than CBN tool. The chips produced were saw tooth in all operating parameters. The CBN tool was unable to withstand heat at cutting zone and hence more flank wear occurred. The PCBN tool sustained the temperature and less tool wear occurred. More crater wear formed on PCBN tools where as CBN tool produced less crater wear. The formation of crater wear on the rake face was due to rough surface of the saw tooth chips.Practical implications: The investigation results will provide useful information to applying CBN and PCBN cutting tools in hard turning stainless steels.Originality/value: Hard turning is a latest technology and possible to turn all hard materials. The hard turning produce net shaped products and reduces machining time, low cost per products, etc. The difficult to cut materials like stainless steels was turned by super hard cutting tools like CBN and PCBN to achieve good surface roughness, dimensional control and reduced tool wear.

  8. The advanced smart grid edge power driving sustainability

    CERN Document Server

    Carvallo, Andres

    2011-01-01

    Placing emphasis on practical ""how-to"" guidance, this cutting-edge resource provides you with a first-hand, insider's perspective on the advent and evolution of smart grids in the 21st century (smart grid 1.0). You gain a thorough understanding of the building blocks that comprise basic smart grids, including power plant, transmission substation, distribution, and meter automation. Moreover, this forward-looking volume explores the next step of this technology's evolution. It provides a detailed explanation of how an advanced smart grid incorporates demand response with smart appliances and

  9. Cutting food in terrestrial carnivores and herbivores.

    Science.gov (United States)

    Sanson, Gordon

    2016-06-06

    Insects and mammals cut their food up into small pieces to facilitate ingestion and chemical digestion. Teeth and jaws act as cutting tools, but, unlike engineering tools designed for a specific purpose, must generally cope with substantial variation in food properties and work at many scales. Knowing how teeth and jaws work effectively requires an understanding of the cutting on the edges and the mechanisms that remove cut material. Variability and heterogeneity of diet properties are not well known, and, for example, may be higher and overlap more in the browsing and grazing categories of plant diets. A reinterpretation of tooth function in large mammal browsers and grazers is proposed.

  10. HEMISPHERIC CENTER FOR ENVIRONMENTAL TECHNOLOGY

    Energy Technology Data Exchange (ETDEWEB)

    M.A. Ebadian

    1999-03-30

    A vendor was selected for the diamond wire technology demonstration scheduled for this summer at Princeton Plasma Physics Laboratory (PPPL). A team consisting of personnel from FIU-HCET, PPPL, and AEA Technology reviewed the submitted bids. FIU-HCET will contract this vendor. At the SRS Ninth ICT teleconference, the ICT team discussed the status of the following demonstrations: LRAD; x-ray, K-edge; Strippable Coatings; Thermal Spray Vitrification; Cutting/Shearing/Dismantlement/Size Reduction; and Electrets. The LRAD demo is complete, and the x-ray/K-edge, Strippable Coatings, and Electrets demos are ongoing. The Asbestos and Thermal Spray Vitrification demos require more laboratory testing. The Cutting/Shearing/Dismantlement/Size Reduction demo is undergoing procurement. Five FIU-HCET staff members took the 1S0 14000 environmental auditor training course February 22-26, 1999, given by ASC. The test plan for the Facility Dismantlement Technology Assessment is finished and ready for internal review.

  11. Laser cutting of triangular geometries in aluminum foam: Effect of cut size on thermal stress levels

    Science.gov (United States)

    Yilbas, B. S.; Akhtar, S. S.; Keles, O.

    2013-06-01

    Laser cutting of triangle shaped geometries in aluminum foam is carried out and the influence of triangle size on temperature and stress fields is examined. ABAQUS finite element code is used to simulate temperature and stress fields in the cut sections in line with the experimental conditions. Laser cut sections are examined incorporating optical and scanning electron microscopes, and energy dispersive spectroscopy. It is found that small size triangle cut results in relatively higher temperatures around the cut edges as compared to large size triangle cut; however, opposite is true for von Mises stress. This is attributed to the slow cooling rate in the case of the small size triangle cuts. Laser cut surfaces are free from large defects and locally scattered small dross attachment are found at the kerf exit.

  12. 2012 U. S. Marine Corps S&T Strategic Plan: Leading Edge Technology for the Marines of Tomorrow

    Science.gov (United States)

    2012-01-01

    ROMO ) including attended and unattended space, air, ground and sea sensors down to the individual warfighter. Flagpole to fighting hole, forces...SEA-STO-4: Forecasting adverse sea conditions Develop technologies and decision support tools to forecast wind , waves, and ship motions far...range of military operations ( ROMO ) Goal: The Naval Medicine S &T planning process will identify and prioritize relevant capability gaps

  13. Structure of complex networks: Quantifying edge-to-edge relations by failure-induced flow redistribution

    CERN Document Server

    Schaub, Michael T; Yaliraki, Sophia N; Barahona, Mauricio

    2013-01-01

    The analysis of complex networks has so far revolved mainly around the role of nodes and communities of nodes. However, the dynamics of interconnected systems is commonly focalised on edge processes, and a dual edge-centric perspective can often prove more natural. Here we present graph-theoretical measures to quantify edge-to-edge relations inspired by the notion of flow redistribution induced by edge failures. Our measures, which are related to the pseudo-inverse of the Laplacian of the network, are global and reveal the dynamical interplay between the edges of a network, including potentially non-local interactions. Our framework also allows us to define the embeddedness of an edge, a measure of how strongly an edge features in the weighted cuts of the network. We showcase the general applicability of our edge-centric framework through analyses of the Iberian Power grid, traffic flow in road networks, and the C. elegans neuronal network.

  14. Cutting through the confusion in high performance liquid chromatographic column technology%非线性电泳

    Institute of Scientific and Technical Information of China (English)

    陈义

    2011-01-01

    Column packings continue to evolve as the needs of users for high efficiency, high resolution and highly sensitive high performance liquid chromatographic ( HPLC ) analysis drive further developments. In comparing and contrasting modern HPLC columns technologies, diameters of column packings and particle materials are covered. Some products and applications of modern HPLC columns are provided. Future directions in packing developments are predicted in this introductory article.%@@ 电泳大家当已耳熟能详了,它发现于18世纪初期,有悠久的历史.电泳因Tiselius而进入分离领域,为蛋白质科学的建立和发展立下了汗马功劳.其贡献至今不息,一直是生物学家的掌中宝.

  15. ADVANCED CUTTINGS TRANSPORT STUDY

    Energy Technology Data Exchange (ETDEWEB)

    Troy Reed; Stefan Miska; Nicholas Takach; Kaveh Ashenayi; Gerald Kane; Mark Pickell; Len Volk; Mike Volk; Barkim Demirdal; Affonso Lourenco; Evren Ozbayoglu; Paco Vieira; Lei Zhou

    2000-01-30

    This is the second quarterly progress report for Year 2 of the ACTS project. It includes a review of progress made in Flow Loop development and research during the period of time between Oct 1, 2000 and December 31, 2000. This report presents a review of progress on the following specific tasks: (a) Design and development of an Advanced Cuttings Transport Facility (Task 2: Addition of a foam generation and breaker system), (b) Research project (Task 6): ''Study of Cuttings Transport with Foam Under LPAT Conditions (Joint Project with TUDRP)'', (c) Research project (Task 7): ''Study of Cuttings Transport with Aerated Muds Under LPAT Conditions (Joint Project with TUDRP)'', (d) Research project (Task 8): ''Study of Flow of Synthetic Drilling Fluids Under Elevated Pressure and Temperature Conditions'', (e) Research project (Task 9): ''Study of Foam Flow Behavior Under EPET Conditions'', (f) Research project (Task 10): ''Study of Cuttings Transport with Aerated Mud Under Elevated Pressure and Temperature Conditions'', (g) Research on instrumentation tasks to measure: Cuttings concentration and distribution in a flowing slurry (Task 11), and Foam properties while transporting cuttings. (Task 12), (h) Development of a Safety program for the ACTS Flow Loop. Progress on a comprehensive safety review of all flow-loop components and operational procedures. (Task 1S). (i) Activities towards technology transfer and developing contacts with Petroleum and service company members, and increasing the number of JIP members. The tasks Completed During This Quarter are Task 7 and Task 8.

  16. Taping torque test for cutting fluid evaluation: test method and procedure

    DEFF Research Database (Denmark)

    Belluco, Walter; De Chiffre, Leonardo

    Tapping torque is a parameter closely connected to the lubricating effect of a cutting fluid. Tapping involves many small cutting edges in continuous contact with the work throughout the cut. The design of the tools and the nature of this operation shield the edges of the tool from the flow of th...

  17. Nitrogen removal from coal gasification wastewater by activated carbon technologies combined with short-cut nitrogen removal process.

    Science.gov (United States)

    Zhao, Qian; Han, Hongjun; Hou, Baolin; Zhuang, Haifeng; Jia, Shengyong; Fang, Fang

    2014-11-01

    A system combining granular activated carbon and powdered activated carbon technologies along with shortcut biological nitrogen removal (GAC-PACT-SBNR) was developed to enhance total nitrogen (TN) removal for anaerobically treated coal gasification wastewater with less need for external carbon resources. The TN removal efficiency in SBNR was significantly improved by introducing the effluent from the GAC process into SBNR during the anoxic stage, with removal percentage increasing from 43.8%-49.6% to 68.8%-75.8%. However, the TN removal rate decreased with the progressive deterioration of GAC adsorption. After adding activated sludge to the GAC compartment, the granular carbon had a longer service-life and the demand for external carbon resources became lower. Eventually, the TN removal rate in SBNR was almost constant at approx. 43.3%, as compared to approx. 20.0% before seeding with sludge. In addition, the production of some alkalinity during the denitrification resulted in a net savings in alkalinity requirements for the nitrification reaction and refractory chemical oxygen demand (COD) degradation by autotrophic bacteria in SBNR under oxic conditions. PACT showed excellent resilience to increasing organic loadings. The microbial community analysis revealed that the PACT had a greater variety of bacterial taxons and the dominant species associated with the three compartments were in good agreement with the removal of typical pollutants. The study demonstrated that pre-adsorption by the GAC-sludge process could be a technically and economically feasible method to enhance TN removal in coal gasification wastewater (CGW).

  18. Investigation of wear and tool life of coated carbide and cubic boron nitride cutting tools in high speed milling

    Directory of Open Access Journals (Sweden)

    Pawel Twardowski

    2015-06-01

    Full Text Available The objective of the investigation was analysis of the wear of milling cutters made of sintered carbide and of boron nitride. The article presents the life period of the cutting edges and describes industrial conditions of the applicability of tools made of the materials under investigation. Tests have been performed on modern toroidal and ball-end mill cutters. The study has been performed within a production facility in the technology of high speed machining of 55NiCrMoV6 and X153CrMoV12 hardened steel. The analysed cutting speed is a parameter which significantly influences the intensity of heat generated in the cutting zone. Due to the wear characteristics, two areas of applicability of the analysed tools have been distinguished. For vc  ≤ 300 m/min, sintered carbide edges are recommended; for vc  > 500 m/min, boron nitride edges. For 300 ≤ vc  ≤ 500 m/min, a transition area has been observed. It has been proved that the application of sintered carbide edges is not economically justified above certain cutting speed.

  19. Update on scribe–cleave–passivate (SCP) slim edge technology for silicon sensors: Automated processing and radiation resistance

    Energy Technology Data Exchange (ETDEWEB)

    Fadeyev, V., E-mail: fadeyev@ucsc.edu [Santa Cruz Institute for Particle Physics, University of California, Santa Cruz, CA 95064 (United States); Ely, S.; Galloway, Z.; Ngo, J.; Parker, C.; Sadrozinski, H.F.-W. [Santa Cruz Institute for Particle Physics, University of California, Santa Cruz, CA 95064 (United States); Christophersen, M.; Phlips, B.F. [U.S. Naval Research Laboratory, Code 7654, 4555 Overlook Avenue, Southwest Washington, DC 20375 (United States); Pellegrini, G.; Rafi, J.M.; Quirion, D. [Instituto de Microelectrónica de Barcelona, IMB-CNM-CSIC, Bellaterra, Barcelona (Spain); Dalla Betta, G.-F. [INFN and University of Trento, Via Sommarive, 14, 38123 Povo di Trento (Italy); Boscardin, M. [Fondazione Bruno Kessler, Via Sommarive, 18, 38123 Povo di Trento (Italy); Casse, G. [Department of Physics, University of Liverpool, O. Lodge Laboratory, Oxford Street, Liverpool L69 7ZE (United Kingdom); Gorelov, I.; Hoeferkamp, M.; Metcalfe, J.; Seidel, S. [Department of Physics and Astronomy, University of New Mexico, MSC 07 4220, 1919 Lomas Boulevard NE, Albuquerque, NM 87131 (United States); Gaubas, E.; Ceponis, T. [Institute of Applied Research, Vilnius University, Sauletekio 9, LT-10222 Vilnius (Lithuania); and others

    2014-11-21

    We pursue scribe–cleave–passivate (SCP) technology for making “slim edge” sensors. The goal is to reduce the inactive region at the periphery of the devices while maintaining their performance. In this paper we report on two aspects of the current efforts. The first one involves fabrication options for mass production. We describe the automated cleaving tests and a simplified version of SCP post-processing of n-type devices. Another aspect is the radiation resistance of the passivation. We report on the radiation tests of n- and p-type devices with protons and neutrons.

  20. The Robotic Edge Finishing Laboratory

    Energy Technology Data Exchange (ETDEWEB)

    Loucks, C.S.; Selleck, C.B.

    1990-08-01

    The Robotic Edge Finishing Laboratory at Sandia National Laboratories is developing four areas of technology required for automated deburring, chamfering, and blending of machined edges: (1) the automatic programming of robot trajectories and deburring processes using information derived from a CAD database, (2) the use of machine vision for locating the workpiece coupled with force control to ensure proper tool contact, (3) robotic deburring, blending, and machining of precision chamfered edges, and (4) in-process automated inspection of the formed edge. The Laboratory, its components, integration, and results from edge finishing experiments to date are described here. Also included is a discussion of the issues regarding implementation of the technology in a production environment. 24 refs., 17 figs.

  1. 技术创新助推新型陶瓷刀具在机加工中的应用优势凸显%Technology Innovation Boost New Types of Ceramic Cutting Tool in Machining Application Advantages Highlighted

    Institute of Scientific and Technical Information of China (English)

    杨忠敏

    2014-01-01

    随着新技术革命的发展,要求不断提高切削加工生产率和降低生产成本,特别是数控机床的发展,要求开发比硬质合金刀具切速更高、更耐磨的新型刀具。针对新型陶瓷切削刀具的应用前景广阔,分析了切削刀具材料的种类及其特点,研究了新型陶瓷切削刀具的性能突显,介绍了新型陶瓷切削刀具运用实例,提出了陶瓷切削刀具材料的研发应用方向。%With the development of new technology revolution ,requirements to improve machi‐ning productivity and reduce production cost ,especially the development of CNC machine tools ,to develop higher than cemented carbide cutting speed ,more new tool wear .Application prospect of the new ceramic cutting tool .Analyzes the types and characteristics of the cutting tool materials ,studies the performance of the new type of ceramic cutting tools highlight ,this paper introduces the new type of ceramic cutting tools using instance ,put forward the direction of development and application of ceramic cutting tool materials .

  2. The problems of shearer knife-edges wear due to temperature and machine cutting conditions of rock. Zagadnienie zuzycia ostrzy nozy kombajnowych w zaleznosci od temperatury i warunkow skrawania skaly

    Energy Technology Data Exchange (ETDEWEB)

    Klich, A.; Kotwica, K.; Krawczyk, S.; Ptak, J. (Akademia Gorniczo-Hutnicza, Cracow (Poland))

    1994-09-01

    The article presents the theoretical dependences for wear determination of shearer knife-edges and their temperature. The laboratory tests of RAPID 85 radial tools and ALPINE cone-rotational ones conducted in the laboratory of the Mining Machines and Deads Utilization-Systems Department of the Academy of Mining and Metallurgy in Krakow, are discussed. The test was made for selected parameters of getting on concrete blocks both in a dry way and also by assistance of getting tools job with high-pressure water jet. (author). 5 refs., 10 figs., 3 tabs.

  3. Sparsest cuts and concurrent flows in product graphs

    NARCIS (Netherlands)

    Bonsma, Paul

    2004-01-01

    A cut [S.S] is a sparsest cut of a graph G if its cut value [S][S]/[S.S] is maximum (this is the reciprocal of the well-known edge-density of the cut). In the (undirected) uniform concurrent flow problem on G, between every vertex pair of G flow paths with a total flow of 1 have to be established. T

  4. Optimal Extracting Technology of Symmetry Edge of Point Cloud%点云对称边特征的最优化提取技术

    Institute of Scientific and Technical Information of China (English)

    张旭; 张学昌; 唐觉明

    2013-01-01

    To improve the precision and ensure strict symmetry of extraction results, an optimal extracting technology of symmetry edge of point cloud was proposed. The template was customized based on CAD model,and then the template was matched with point cloud. The point cloud was sliced using a series of planes constructed by points and vectors of the template information then a series of sections were gotten. Every section data was optimized to get an edge point. The edge points were divided into two parts using the symmetry axis, and one part was mirrored through the symmetry axis to construct the parametric points. The objective points consisted of the parametric points and the other part. An objective function was constructed by the objective points. Objective function was solved iteratively to get optimal edge curves. The edge curves were mirrored according to symmetry axis to get the other side curves. The example shows the results of optimization improve the precision and ensure strict symmetry of extraction result.%针对点云对称边特征提取精度问题和严格对称问题通常不能满足要求的情况,提出点云对称边特征的最优化提取技术.根据CAD模型定制的模板中包含后续求解的相关信息.配准模板与点云数据,根据模板中点和切矢构建一系列平面,再利用其对点云数据进行切片获得一系列二维截面数据.对每一截面数据进行优化求解获取边点.将求解的一系列边点以对称中心为界分为两半,一半以模板中的对称轴为中心做镜像获得参数化的点,将参数化的点与另一半边点一起构成目标点.对这些目标点进行整体的约束优化,获得最优边曲线.根据对称轴对最优边曲线做镜像获得另一边的边曲线.运行示例证明了该方法的可行性,运行结果表明,提取的对称边特征在满足精度的同时保证了严格的对称.

  5. 大厚度材料磨料水射流切割工艺及关键技术%Abrasive Water Jet Cutting Process and Key Technology of Big-thickness Materials

    Institute of Scientific and Technical Information of China (English)

    李连荣; 王晓燕; 许栋刚

    2012-01-01

    water-jet cutting process with its unique cold and soft processing characteristics, and more unique advantages compared to other cutting process according to all kinds of thermal and hard brittle materials has good prospects for future development. But because of its own flexible jet characteristics, especially in cutting big thickness materials, it exists the quality insufficient obvious such as slope, corrugated, cross section lag, cut back sewing. That becomes the marketing bottlenecks restricted technology. In this paper, from the abrasive water jet cutting process principle mechanism and technology advantages, based on the points out its defects and cutting process effect factors affecting process, the specific key technology was proposed. It has positive practical significance to expand the application fields.%磨料水射流切割工艺以其独特的“冷、软”加工特性,与其他切割工艺相比,对各类热敏、硬脆等难加工材料的切割更有独特优势,具有良好的发展前景.但因射流自身的“柔性”特征,尤其在切割大厚度材料时存在断面明显坡度、波纹、滞后、切缝、回击等质量不足,成为制约该技术应用市场推广的瓶颈.本文从磨料水射流切割工艺原理和工艺优势出发,在指出其工艺缺陷和切割效果工艺影响因素的基础上,提出针对性的关键技术,对拓展该技术的应用领域具有积极的现实意义.

  6. The Impact of Digital Video Technology on Production: The Case of "American Gothic."

    Science.gov (United States)

    Fink, Edward J.

    1997-01-01

    Opines that the study of video production is important in better understanding the aural/visual aspects of television, especially since television production is undergoing a digital revolution. Assesses the impact of new technologies by examining a "cutting-edge" program, "American Gothic." Finds that digital technology offers…

  7. Transforming Schools with Technology: How Smart Use of Digital Tools Helps Achieve Six Key Education Goals

    Science.gov (United States)

    Zucker, Andrew A.

    2008-01-01

    In this timely and thoughtful book, Andrew Zucker argues that technology can and will play a central role in efforts to achieve crucial education goals, and that it will be an essential component of further improvement and transformation of schools. The book is marked not only by Zucker's cutting-edge sophistication about digital technologies, but…

  8. ADVANCED CUTTINGS TRANSPORT STUDY

    Energy Technology Data Exchange (ETDEWEB)

    Troy Reed; Stefan Miska; Nicholas Takach; Kaveh Ashenayi; Gerald Kane; Mark Pickell; Len Volk; Mike Volk; Barkim Demirdal; Affonso Lourenco; Evren Ozbayoglu; Paco Vieira

    2000-10-30

    This is the first quarterly progress report for Year 2 of the ACTS project. It includes a review of progress made in Flow Loop development and research during the period of time between July 14, 2000 and September 30, 2000. This report presents information on the following specific tasks: (a) Progress in Advanced Cuttings Transport Facility design and development (Task 2), (b) Progress on research project (Task 8): ''Study of Flow of Synthetic Drilling Fluids Under Elevated Pressure and Temperature Conditions'', (c) Progress on research project (Task 6): ''Study of Cuttings Transport with Foam Under LPAT Conditions (Joint Project with TUDRP)'', (d) Progress on research project (Task 7): ''Study of Cuttings Transport with Aerated Muds Under LPAT Conditions (Joint Project with TUDRP)'', (e) Progress on research project (Task 9): ''Study of Foam Flow Behavior Under EPET Conditions'', (f) Initiate research on project (Task 10): ''Study of Cuttings Transport with Aerated Mud Under Elevated Pressure and Temperature Conditions'', (g) Progress on instrumentation tasks to measure: Cuttings concentration and distribution (Tasks 11), and Foam properties (Task 12), (h) Initiate a comprehensive safety review of all flow-loop components and operational procedures. Since the previous Task 1 has been completed, we will now designate this new task as: (Task 1S). (i) Activities towards technology transfer and developing contacts with Petroleum and service company members, and increasing the number of JIP members.

  9. 鲜切雪莲果防褐绿变工艺研究%The Anti-green and Browning Technology for Fresh-cut Yacon

    Institute of Scientific and Technical Information of China (English)

    蔡文韬; 夏延斌; 张音

    2011-01-01

    以雪莲果为试材,研究鲜切雪莲果防褐绿变的工艺.实验中比较了不同护色处理方法的护色效果,采用正交实验筛选出鲜切雪莲果的最佳组合护色条件,雪莲果最优组合防褐绿变的工艺为0.1%CaCl2,0.15%柠檬酸,浸泡30min,在.21℃下冻藏7d,未见褐变和绿变.%Yacon was as experimental material to study the anti-enzymatic browning and greening process. By comparing the different treatment effect of the color-protecting methods, the best color-protecting combination technology of fresh-cut Yacon was determined by orthogonal experiments as: 0.1% calcium chloride, 0.15% citric acid, and soaked time 30 min. The color is little changed at -21℃ in 7 days.

  10. On Question of Science and Technology Being Double edged Sword%“科学技术是双刃剑”质疑

    Institute of Scientific and Technical Information of China (English)

    周德海

    2014-01-01

    In academia,scholars who think that “science and technology is a double edged sword”,seem not to be truly understand the basic nature of science and technology,thus in their point of view,there are many obvious flaws.Science and technology has a nature of truth,goodness and beauty and it can not simultaneously contain false,ugly,evil content.Thus,it is an illogical proposition.People in the process of using science and technology in practical activities are often subject to retaliation from the blind forces of nature due to their ignorance.Some individuals,groups and countries use science and technology to en¯ gage in criminal activity due to their greed,there is no reason to attribute human′s crimes to science and technology.%在学术界,持“科学技术是双刃剑”论的学者,似乎没有真正搞清楚科学技术的基本性质,因而他们的观点存在诸多明显缺陷。科学技术具有真、善、美的本性。具有真、善、美本性的科学技术,不可能同时包含着假、恶、丑的内容,因而“科学技术是双刃剑”的命题不合逻辑。人类在利用科学技术从事实践活动的过程中,常常会受到来自自然界盲目力量的报复,那是因为人类的无知。而一些个人、团体和国家利用科学技术从事犯罪活动,则根源于他们的贪婪,没有理由把他们犯下的罪行归咎于科学技术。

  11. The Technology of Wavefront Reconstruction Based on Knife-Edge Test%基于刀口检验的波面重建技术

    Institute of Scientific and Technical Information of China (English)

    李翔华; 孙自南; 吴晓鸣

    2012-01-01

    The technology of wavefront reconstruction based on knife-edge test was proposed for large aperture and long focal length optical surface measurement, which could improve the performance of traditional Foucault test. Integrating the traditional Foucault test with CCD camera, the technology adopted digital image processing to eliminate the disruption of draught, and data processing software to extract characteristic parameters of the shadow. After processing to these parameters, wavefront map of optical surface being fabricated could be gained, which might reflect the optical surface error straightforwardly. The experimental results show that contour map of gray scale and wavefront map reflect surface error satisfactorily, and the technology can be used to direct the fabrication of optical surface in the stage of grinding and initial stage of polishing.%基于刀口检验的波面重建技术主要是针对大口径长焦距镜面在细磨粗抛阶段的光学检测难题而提出的.该技术实现了对传统傅科检验的改进,其主要内容是:通过CCD采集多幅图像并进行平均消除气流干扰得到真实的傅科阴影图,通过数学建模、原理推导、图像处理及软件编程将傅科阴影图像的灰度变化转换成被检面形的波前等高图.实验结果表明,该技术准确直观地再现了被加工镜面的整体面形误差,能够对细磨粗抛阶段,尤其是细磨改非球面阶段的镜面加工提供很好的指导作用.

  12. Quantum Max-flow/Min-cut

    Science.gov (United States)

    Cui, Shawn X.; Freedman, Michael H.; Sattath, Or; Stong, Richard; Minton, Greg

    2016-06-01

    The classical max-flow min-cut theorem describes transport through certain idealized classical networks. We consider the quantum analog for tensor networks. By associating an integral capacity to each edge and a tensor to each vertex in a flow network, we can also interpret it as a tensor network and, more specifically, as a linear map from the input space to the output space. The quantum max-flow is defined to be the maximal rank of this linear map over all choices of tensors. The quantum min-cut is defined to be the minimum product of the capacities of edges over all cuts of the tensor network. We show that unlike the classical case, the quantum max-flow=min-cut conjecture is not true in general. Under certain conditions, e.g., when the capacity on each edge is some power of a fixed integer, the quantum max-flow is proved to equal the quantum min-cut. However, concrete examples are also provided where the equality does not hold. We also found connections of quantum max-flow/min-cut with entropy of entanglement and the quantum satisfiability problem. We speculate that the phenomena revealed may be of interest both in spin systems in condensed matter and in quantum gravity.

  13. Toward a first-principles integrated simulation of tokamak edge plasmas

    Energy Technology Data Exchange (ETDEWEB)

    Chang, C S [New York University; Klasky, Scott A [ORNL; Cummings, Julian [California Institute of Technology, Pasadena; Samtaney, Ravi [Princeton Plasma Physics Laboratory (PPPL); Shoshani, A. [Lawrence Berkeley National Laboratory (LBNL); Sugiyama, L. [Massachusetts Institute of Technology (MIT); Keyes, David E [Columbia University; Ku, Seung-Hoe [New York University; Park, G. [New York University; Parker, Scott [University of Colorado, Boulder; Podhorszki, Norbert [ORNL; Strauss, H. [New York University; Abbasi, H. [Georgia Institute of Technology; Adams, Mark [Columbia University; Tchoua, Roselyne B [ORNL; Bateman, Glenn [Lehigh University, Bethlehem, PA; Bennett, K. [Rutgers University; Chen, Yang [University of Colorado, Boulder; D' Azevedo, Eduardo [ORNL; Docan, Ciprian [Rutgers University; Ethier, Stephane [Princeton Plasma Physics Laboratory (PPPL); Feibush, E. [Princeton Plasma Physics Laboratory (PPPL); Greengard, Leslie [New York University; Hahm, Taik Soo [Princeton Plasma Physics Laboratory (PPPL); Hinton, Fred [University of California, San Diego; Jin, Chen [ORNL; Khan, A. [University of Utah; Kritz, Arnold [Lehigh University, Bethlehem, PA; Krstic, Predrag S [ORNL; Lao, T. [Columbia University; Lee, Wei-Li [Princeton Plasma Physics Laboratory (PPPL); Lin, Zhihong [University of California, Irvine; Lofstead, J. [Georgia Institute of Technology; Mouallem, P. A. [North Carolina State University; Nagappan, M. [North Carolina State University; Pankin, A. [Lehigh University, Bethlehem, PA; Parashar, Manish [Rutgers University; Pindzola, Michael S. [Auburn University, Auburn, Alabama; Reinhold, Carlos O [ORNL; Schultz, David Robert [ORNL; Schwan, Karsten [Georgia Institute of Technology; Silver, D. [Rutgers University; Sim, A. [Lawrence Berkeley National Laboratory (LBNL); Stotler, D. [Princeton Plasma Physics Laboratory (PPPL); Vouk, M. A. [North Carolina State University; Wolf, M. [Georgia Institute of Technology; Weitzner, Harold [New York University; Worley, Patrick H [ORNL; Xiao, Y. [University of California, Irvine; Yoon, E. [Princeton Plasma Physics Laboratory (PPPL); Zorin, Denis [New York University

    2008-01-01

    Performance of the ITER is anticipated to be highly sensitive to the edge plasma condition. The edge pedestal in ITER needs to be predicted from an integrated simulation of the necessary firstprinciples, multi-scale physics codes. The mission of the SciDAC Fusion Simulation Project (FSP) Prototype Center for Plasma Edge Simulation (CPES) is to deliver such a code integration framework by (1) building new kinetic codes XGC0 and XGC1, which can simulate the edge pedestal buildup; (2) using and improving the existing MHD codes ELITE, M3D-OMP, M3D-MPP and NIMROD, for study of large-scale edge instabilities called Edge Localized Modes (ELMs); and (3) integrating the codes into a framework using cutting-edge computer science technology. Collaborative effort among physics, computer science, and applied mathematics within CPES has created the first working version of the End-to-end Framework for Fusion Integrated Simulation (EFFIS), which can be used to study the pedestal-ELM cycles.

  14. Toward a first-principles integrated simulation of tokamak edge plasmas

    Energy Technology Data Exchange (ETDEWEB)

    Chang, C S; Ku, S; Park, G; Strauss, H [New York University, New York, NY 10012 (United States); Klasky, S; Podhorszki, N; Barreto, R; Azevedo, E D' [Oak Ridge National Laboratory, Oak Ridge, TN 37381 (United States); Cummings, J [California Institute of Technology, Pasadena, CA 91125 (United States); Samtaney, R [Princeton Plasma Physics Laboratory, Princeton, NJ 08543 (United States); Shoshani, A [Lawrence Berkeley National Laboratory, Berkeley, CA 94720 (United States); Sugiyama, L [Massachusetts Institute of Technology, Cambridge, MA 02139 (United States); Keyes, D; Adams, M [Columbia University, New York NY 10027 (United States); Parker, S; Chen, Y [University of Colorado at Boulder, Boulder, CO 80309 (United States); Abbasi, H [Georgia Institute of Technology, Atlanta, GA 30332 (United States); Bateman, G [Lehigh University, Bethlehem, PA 18015 (United States); Bennett, K; Docan, C [Rutgers University, New Brunswick, NJ 08901 (United States)], E-mail: cschang@cims.nyu.edu, E-mail: klasky@ornl.gov (and others)

    2008-07-15

    Performance of the ITER is anticipated to be highly sensitive to the edge plasma condition. The edge pedestal in ITER needs to be predicted from an integrated simulation of the necessary first-principles, multi-scale physics codes. The mission of the SciDAC Fusion Simulation Project (FSP) Prototype Center for Plasma Edge Simulation (CPES) is to deliver such a code integration framework by (1) building new kinetic codes XGC0 and XGC1, which can simulate the edge pedestal buildup; (2) using and improving the existing MHD codes ELITE, M3D-OMP, M3D-MPP and NIMROD, for study of large-scale edge instabilities called Edge Localized Modes (ELMs); and (3) integrating the codes into a framework using cutting-edge computer science technology. Collaborative effort among physics, computer science, and applied mathematics within CPES has created the first working version of the End-to-end Framework for Fusion Integrated Simulation (EFFIS), which can be used to study the pedestal-ELM cycles.

  15. Analysis of New Cutting and Welding Technology Application in Boiler Industry%新型焊割技术在锅炉行业的应用

    Institute of Scientific and Technical Information of China (English)

    张羽; 姜永晔; 徐展

    2016-01-01

    为了解决目前锅炉焊接操作中存在效率较低、手法和技术较难掌握这一问题,采用STT (surface tension transfer,表面张力熔滴过渡)焊机完成了产品的初步焊接试验。试验结果表明, STT焊机的焊接速度是TIG焊的数倍,且基本不产生熔渣和飞溅,焊接时和焊接后的清理容易、费用低,对焊工技术和经验要求较低,技法容易掌握。另外,为了提高锅炉不锈钢曲面上开孔的工作效率并保证表面质量,采用精细等离子技术进行了产品封头的曲面开孔,在实际操作中解决了精确度控制和挂渣问题,为后续焊接工序减少打磨时间提供了质量保证。%In order to solve some problems in boiler welding operation, such as low efficiency, welding method, and welding technology is more difficult to master, the preliminary welding test was carried out by using STT (surface tension transfer) welder. The test result indicated that the welding speed of STT welder is several times of TIG welder, basically do not produce slag and splash, and the cleaning in welding and after welding is easy, low cost, low requirements for welding technology and experience, easy to grasp. In addition, in order to increase drilling efficiency on boiler stainless steel surface and guarantee surface quality, it adopted fine plasma cutting technology to drill on welded joint surface, this method solved accuracy control and adhering slag, which provided quality assurance for reducing polishing time in follow-up welding process.

  16. Under-water cutting explosive equipment technology of pre-mixed abrasive water%前混合磨料水射流水下排除爆炸物装置技术

    Institute of Scientific and Technical Information of China (English)

    王敬涛; 张沙

    2011-01-01

    为了解决常用切割技术不适宜在水下作业的难题,从工程应用出发,运用数学建模分析、软件模拟仿真等方法,对前混合磨料水射流系统的水下切割技术进行了相关研究和仿真.研究表明,在预设加紧力200N的条件下,设计的装置可以搭载喷枪进行水射流水下排爆作业,水射流过程具有高能、冷态、点割、非接触等特点,可以对各种材料进行任意切割,尤其适合切割各种压敏、热敏材料以及在易燃易爆场合进行切割作业,为下一步实验奠定了理论基础.%To solve the problem that the frequently used cut technology is not suitable for underwater projects, underwater cut technology based on pre-mined abrasive water jet system was researched and emulated by mathematical modeling analysis and software simulation according to project application. Research shows that under the condition of 200N force, the designed device can carry the nozzle to exclude the explosion under water and the cut process has the features of highenergy, cold conditions, point cut and non-contact etc. The water jet cut can cut various materials, especially press sensitive and hot sensitive materials, and work on the inflammable and explosive occasion. The research has established theoretical foundation for next experiments.

  17. NCI Technology Transfer Center | TTC

    Science.gov (United States)

    The National Cancer Institute’s Technology Transfer Center (TTC) facilitates partnerships between the NIH research laboratories and external partners. With specialized teams, TTC guides the interactions of our partners from the point of discovery to patenting, from invention development to licensing. We play a key role in helping to accelerate development of cutting-edge research by connecting our partners to NIH’s world-class researchers, facilities, and knowledge.

  18. 250 MP a超高压磨料射流井下内切割技术∗%Downhole Inner Cutting Technology Based on 250 MPa Ultra High Pressure Abrasive Water Jet

    Institute of Scientific and Technical Information of China (English)

    马认琦; 李刚; 王超; 鞠少栋; 刘占鏖; 徐鸿飞

    2015-01-01

    The decommission of offshore oil and gas production facilities is in demand of high efficient, safe and environmentally friendly cutting technology and equipment�High pressure abrasive water jet cutting technology have obvious advantages on offshore well abandonment�The status of the application and development of domestic and foreign abrasive water jet cutting technology in offshore oil and gas production facilities decommission are de⁃scribed�Comparative analyses are conducted on the domestic and foreign downhole abrasive water jet cutting equip⁃ment and performance parameters�The core technologies and equipment of the existing domestic low pressure and 250 MPa ultra⁃high pressure abrasive water jet downhole inner cutting technology are introduced�Field application results showed that the low⁃pressure and 250 MPa ultra⁃high pressure abrasive water jet inner cutting technology and equipment could meet the operation requirements.%海上油气生产设施弃置需要配置高效、安全环保的切割处理技术及设备,高压磨料射流井下切割技术用于海上弃井作业优势明显。阐述了国内外磨料射流切割技术在海洋油气生产设施弃置领域的应用与发展现状,对比分析了国内外磨料射流井下切割设备及其性能参数,介绍了国内现有低压与250 MP a超高压磨料射流井下内切割核心技术及配套设备。现场应用结果表明,低压与超高压250 MP a磨料射流井下内切割技术及设备满足作业要求。

  19. Handbook of surveillance technologies

    CERN Document Server

    Petersen, JK

    2012-01-01

    From officially sanctioned, high-tech operations to budget spy cameras and cell phone video, this updated and expanded edition of a bestselling handbook reflects the rapid and significant growth of the surveillance industry. The Handbook of Surveillance Technologies, Third Edition is the only comprehensive work to chronicle the background and current applications of the full-range of surveillance technologies--offering the latest in surveillance and privacy issues.Cutting-Edge--updates its bestselling predecessor with discussions on social media, GPS circuits in cell phones and PDAs, new GIS s

  20. Managing the technological edge: the UNESCO International Computation Centre and the limits to the transfer of computer technology, 1946-61.

    Science.gov (United States)

    Nofre, David

    2014-07-01

    The spread of the modern computer is assumed to have been a smooth process of technology transfer. This view relies on an assessment of the open circulation of knowledge ensured by the US and British governments in the early post-war years. This article presents new historical evidence that question this view. At the centre of the article lies the ill-fated establishment of the UNESCO International Computation Centre. The project was initially conceived in 1946 to provide advanced computation capabilities to scientists of all nations. It soon became a prize sought by Western European countries like The Netherlands and Italy seeking to speed up their own national research programs. Nonetheless, as the article explains, the US government's limitations on the research function of the future centre resulted in the withdrawal of European support for the project. These limitations illustrate the extent to which US foreign science policy could operate as (stealth) industrial policy to secure a competitive technological advantage and the prospects of US manufacturers in a future European market.

  1. Effects of Hypobaric Cold Storage Technology on Preservation of Fresh-cut Fruits and Vegetables%减压冷藏技术对鲜切果蔬保鲜效果的研究

    Institute of Scientific and Technical Information of China (English)

    胡欣; 张长峰; 郑先章

    2012-01-01

    以花王菜等6种蔬菜和苹果为试材,研究减压冷藏技术对鲜切果蔬的保鲜效果.结果表明,减压冷藏处理技术是可应用于鲜切果蔬保鲜的新技术.将果蔬原材料经减压冷藏处理(压力范围为600~3 200 Pa),再清洗切割加工成鲜切产品,可比普通冷藏有效减缓山药、土豆和苹果等鲜切产品的褐变;明显减少鲜切花王菜、鸡毛菜和空心菜的萎蔫、黄叶与腐烂,保持鲜切绿叶菜的新鲜品质;切割前的减压冷藏结合真空预冷,可大大减轻鲜切西兰花的黄化、萎蔫、花粒变大、脱落及切面的褐变与腐烂,显著延长鲜切果蔬的冷藏货架期及冷链断链保鲜期.%The experiments used 6 kinds of vegetables and apple as material to research the preservation effects by using hypobaric cold storage technology. The results indicated that, the hypobaric cold storage treatment technology was an advanced new technology of preservation and process for fresh-cut vegetables and fruits. The raw materials of fruits and vegetables were treated by hypobaric cold storage, pressure 600-3 200 Pa, followed washing and cutting to fresh-cut products. Compared with normal cold storage, the hypobaric cold storage treatment technology could retard the brown degree of cut face of yam, potato and apple, decrease the wilting, yellow leaf and rotting of Huawang vegetable, Jimao vegetable and swamp cabbage, also kept their good fresh quality. Hypobaric cold storage before cutting combined with vaccum pre -cooling treatment could greatly readuce the yellow changed, wilting, flower grain growing and dropping, brown degree of cut face and rotting of broccoli, and prolong the shelf life of fresh-cut fruits and vegetables and preservation period of cold chain scission.

  2. ADVANCED CUTTINGS TRANSPORT STUDY

    Energy Technology Data Exchange (ETDEWEB)

    Ergun Kuru; Stefan Miska; Nicholas Takach; Kaveh Ashenayi; Gerald Kane; Len Volk; Mark Pickell; Evren Ozbayoglu; Barkim Demirdal; Paco Vieira; Affonso Lourenco

    1999-10-15

    This report includes a review of the progress made in ACTF Flow Loop development and research during 90 days pre-award period (May 15-July 14, 1999) and the following three months after the project approval date (July15-October 15, 1999) The report presents information on the following specific subjects; (a) Progress in Advanced Cuttings Transport Facility design and development, (b) Progress report on the research project ''Study of Flow of Synthetic Drilling Fluids Under Elevated Pressure and Temperature Conditions'', (c) Progress report on the research project ''Study of Cuttings Transport with Foam Under LPAT Conditions (Joint Project with TUDRP)'', (d) Progress report on the research project ''Study of Cuttings Transport with Aerated Muds Under LPAT Conditions (Joint Project with TUDRP)'', (e) Progress report on the research project ''Study of Foam Flow Behavior Under EPET Conditions'', (f) Progress report on the instrumentation tasks (Tasks 11 and 12) (g) Activities towards technology transfer and developing contacts with oil and service company members.

  3. MECHANISMS OF CUTTING BLADE WEAR AND THEIR INFLUENCE ON CUTTING ABILITY OF THE TOOL DURING MACHINING OF SPECIAL ALLOYS

    Directory of Open Access Journals (Sweden)

    Tomáš Zlámal

    2016-09-01

    Full Text Available With increased requirements for quality and shelf life of machined parts there is also a higher share of the use of material with specific properties that are identified by the term “superalloys”. These materials differ from common steels by mechanical and physical properties that cause their worse machinability. During machining of “superalloys” worse machinability has negative influence primarily on the amount of cutting edge wear, which shortens durability of the cutting tool. The goal of experimental activity shown in this contribution is to determine individual mechanisms of the cutting edge wear and their effects on the cutting ability during high speed machining of nickel superalloy. A specific exchangeable cutting insert made from cubic boric nitride was used for machining of the 625 material according to ASM 5666F. The criteria to evaluate cutting ability and durability of the cutting tool became selected parameters of surface integrity and quality of the machined surface.

  4. 模具制造中的高速切削技术分析%Mold Manufacturing Technology of High-Speed Cutting

    Institute of Scientific and Technical Information of China (English)

    王晓艳

    2012-01-01

    With the rapid development of high-tech, high requirements made on the mold manufacturing industry, the traditional mold usually first milling and then hardened, and then follow-up of EDM and polishing, manufacturing process complexity, process efficiency is low, higher energy consumption, pollution, large; high-speed cutting technology in the mold manufacturing industry, can be obtained directly through the high speed hard machining precision and surface quality, manufacturing process is simple, machining efficiency is higher, less energy consumption, less polluting with good economic benefits, it fits to wide applied in mold making.%随着国家高新技术产业的快速发展,对模具制造业也提出较高要求,传统的模具制造通常采用先铣削再淬硬,然后电火花加工及后续抛磨,制造工艺复杂、加工效率低、能源消耗高、污染较大。高速切削技术应用在模具制造业中,可以直接通过高速硬切削获得较高的精度及表面质量,高速切削技术制造工艺过程简单、加工效率较高、能源消耗少、污染较小且具有良好的经济效益,因此,适宜在模具加工中广泛推广应用。

  5. Molding development of Chinese dress and its cutting technology%近代旗袍的造型变革以及裁剪技术

    Institute of Scientific and Technical Information of China (English)

    陈研; 张竞琼; 李向军

    2012-01-01

    Based on the research into various kinds of Chinese dress collected and kept in the Folk Costume Exhibition and Learning Hall of Jiangnan University and Shanghai Yifengtang Museum, this article introduces Chinese dress in terms of the molding development, innovation in cutting technology, decoration process from "complexity to simplicity", molding construction from "square shoulder connected with sleeves to sloping shoulder connected with sleeves ", and from "without dart to with dart". It points out that the modern Chinese dress is a classical work combining the Chinese style with the western one, successfully completing the transformation from Chinese traditional "plane molding" to western "stereo molding" and ending the period of "adapting person to dress" and opening the new era of " adapting dress to person".%通过对江南大学民间服饰传习馆与上海艺风堂博物馆馆藏传世旗袍的研究与分析,从早期旗袍的造型演变、近代旗袍的造型变革及裁剪技术的改良为切入点,描述由繁到简的装饰工艺,论述了由平肩连袖到斜肩接袖、由无省到有省的造型结构,指出近代旗袍是融合中西的经典之作.它成功地完成了从中式传统平面造型向西式立体造型完美蜕变的同时,终结了“人适应衣”的时代,开创了“衣适应人”的新时代.

  6. Model Test on Concrete Cutting Directly by Shield and Pile Foundation Cutting Technology%盾构切削混凝土模拟试验和切削桩基施工技术

    Institute of Scientific and Technical Information of China (English)

    傅德明

    2014-01-01

    Underground obstacles,such as concrete piles,soil retaining structures,pipes and trenches and underground structures,are often encountered during shield boring in the construction of urban rail transit works.These pile founda-tions are normally underpinned,dismantled or manually cut.However,these conventional treatment methods have such disadvantages as high cost,long construction period and severe influence on the surrounding traffics.A400 mm model shield is used to cut blind concrete,glass fiber concrete and reinforced concrete,so as to study the feasibility of pile foundation cutting directly by shields,to make analysis on the modification of cutter heads and to obtain shield boring control parameters.Furthermore,the experience of the pile foundation cutting directly by shields in the construction of No.7 line and No.10 line of Shanghai rail transit works is described.Conclusions drawn are as follows:1 )It is feasi-ble to cut reinforced concrete directly by shields;2)Before shield launching,the cutter head should be modified,and a number of advance cutting tools and shell tools should be installed on the cutter head;3 )During the cutting of the pile foundations directly by shield,the shield should advance slowly (with less than 10 mm/min advance speed),and the earth pressure,thrust and cutter head torque set should be stable;4)During the cutting of the pile foundations directly by shield,lubricating and friction-reducing materials should be added into the excavation chamber so as to prevent the screw conveyor from being jammed by concrete blocks.After the shield passes the obstacle point,secondary grouting should be made to fill the annulus space behind the segment lining on basis of the monitoring results so as to control the settlement of the ground surface and the nearby buildings;5 )Cutting pile foundations directly by shield has advantages, including low cost,high safety and small environmental influence.%城市轨道交通盾构施工中经常遇到穿

  7. ADVANCED CUTTINGS TRANSPORT STUDY

    Energy Technology Data Exchange (ETDEWEB)

    Ergun Kuru; Stefan Miska; Nicholas Takach; Kaveh Ashenayi; Gerald Kane; Mark Pickell; Len Volk; Mike Volk; Barkim Demirdal; Affonso Lourenco; Evren Ozbayoglu; Paco Vieira; Neelima Godugu

    2000-07-30

    ACTS flow loop is now operational under elevated pressure and temperature. Currently, experiments with synthetic based drilling fluids under pressure and temperature are being conducted. Based on the analysis of Fann 70 data, empirical correlations defining the shear stress as a function of temperature, pressure and the shear rate have been developed for Petrobras synthetic drilling fluids. PVT equipment has been modified for testing Synthetic oil base drilling fluids. PVT tests with Petrobras Synthetic base mud have been conducted and results are being analyzed Foam flow experiments have been conducted and the analysis of the data has been carried out to characterize the rheology of the foam. Comparison of pressure loss prediction from the available foam hydraulic models and the test results has been made. Cuttings transport experiments in horizontal annulus section have been conducted using air, water and cuttings. Currently, cuttings transport tests in inclined test section are being conducted. Foam PVT analysis tests have been conducted. Foam stability experiments have also been conducted. Effects of salt and oil concentration on the foam stability have been investigated. Design of ACTS flow loop modification for foam and aerated mud flow has been completed. A flow loop operation procedure for conducting foam flow experiments under EPET conditions has been prepared Design of the lab-scale flow loop for dynamic foam characterization and cuttings monitoring instrumentation tests has been completed. The construction of the test loop is underway. As part of the technology transport efforts, Advisory Board Meeting with ACTS-JIP industry members has been organized on May 13, 2000.

  8. Cyber Security at the District Level: Are You Ready to Prevent Unlawful, Unauthorized or Simply Misguided Use of Your Technology?

    Science.gov (United States)

    Lafee, Scott

    2005-01-01

    In an era of digital technologies, school districts find themselves on a cutting edge, one that slices both ways. Technological tools like the Internet, e-mail, networked computers and such have revolutionized the way children are taught and schools are run, but they also have created new management challenges and ethical issues that many school…

  9. Cyber Security at the District Level: Are You Ready to Prevent Unlawful, Unauthorized or Simply Misguided Use of Your Technology?

    Science.gov (United States)

    Lafee, Scott

    2005-01-01

    In an era of digital technologies, school districts find themselves on a cutting edge, one that slices both ways. Technological tools like the Internet, e-mail, networked computers and such have revolutionized the way children are taught and schools are run, but they also have created new management challenges and ethical issues that many school…

  10. 激光切割技术在冲压行业中的应用和发展趋势%Application and Development Trent of Laser Cutting Technology in Stamping Industry

    Institute of Scientific and Technical Information of China (English)

    胡俊舟; 鲜光斌; 许小宝; 罗琳

    2012-01-01

    介绍了激光切割技术在冲压行业中的应用和发展趋势。激光切割技术的不断发展和应用,可能能替代部分修边冲孔模具和落料模具,生产效率高,能适用各种各样的车型,有利于降低整车开发过程中的成本。%Introduced application and development trent of laser cutting technology in stamping industry. Laser cutting technology development and application could replace part of trimming and punching die and blanking die, the production efficiency is high, can be applied to various kinds of vehicles, reduce the vehicle development process cost.

  11. Corn stalk orientation effect on mechanical cutting

    Energy Technology Data Exchange (ETDEWEB)

    Igathinathane, C. [Mississippi State University (MSU); Womac, A.R. [University of Tennessee; Sokhansanj, Shahabaddine [ORNL

    2010-07-01

    Research efforts that increase the efficiency of size reduction of biomass can lead to a significant energy saving. This paper deals with the determination of the effect of sample orientation with respect to cutting element and quantify the possible cutting energy reduction, utilising dry corn stalks as the test material (15%e20% wet basis). To evaluate the mechanical cutting characteristics of corn stalks, a Warnere Bratzler device was modified by replacing its blunt edged cutting element with one having a 30_ single bevel sharp knife edge. Cutting force-deformation characteristics obtained with a universal testing machine were analysed to evaluate the orientation effects at perpendicular (90o), inclined (45o), and parallel (0o) orientations on internodes and nodes for cutting force, energy, ultimate stress, and specific energy of corn stalks. The corn stalks cutting force-displacement characteristics were found to differ with orientation, and internode and node material difference. Overall, the peak failure force, and the total cutting energy of internodes and nodes varied significantly (P < 0.05) with stalk cross-sectional area. The specific energy values (total energy per unit cut area) of dry corn stalk internodes ranged from 11.3 to 23.5 kN m_1, and nodes from 8.6 to 14.0 kN m_1. The parallel orientation (along grain) compared to perpendicular (across grain) produced a significant reduction of the cutting stress and the specific energy to one tenth or better for internodes, and to about one-fifth for nodes.

  12. Study on Technological Parameters of YAG Laser Cutting Cold Rolled Steel Sheets%YAG激光切割冷轧钢板的工艺参数研究

    Institute of Scientific and Technical Information of China (English)

    关雷; 史子木; 舒胜威

    2014-01-01

    实验使用YAG脉冲激光切割机切割Q235薄冷轧钢板。基于激光切割理论,采用正交试验对激光切割工艺参数进行优化。以切口宽度和切口的表面粗糙度为衡量标准,通过对比得出切割0.7 mm、1.0 mm、1.5 mm厚的Q235冷轧钢板的最优切割参数。%Q235 cold rolled steel sheets are cut by YAG pulse laser in this experiment. We optimize the process of laser cutting with orthogonal test depend upon the theory of laser cutting. Summarizing optimal cutting quality and the best process parameters of cutting 0.7, 1.0, 1.5 mm cold rolled steel sheet should be reached by measuring the joint-cutting width and comparison the surface roughness of incision.

  13. Max Cut and the Smallest Eigenvalue

    CERN Document Server

    Trevisan, Luca

    2008-01-01

    We describe a new approximation algorithm for Max Cut. Our algorithm runs in nearly quadratic time and achieves an approximation ratio of .50769. On instances in which an optimal solution cuts a $1-\\epsilon$ fraction of edges, our algorithm finds a solution that cuts a $1-4\\epsilon^{1/3}-o(1)$ fraction of edges. Our main result is a variant of spectral partitioning, which can be implemented in nearly linear time, that, given a graph in which the Max Cut optimum is a $1-\\epsilon$ fraction of edges, finds a set S of vertices and a bipartition L, R=S-L, of S such that at least a $1-4\\sqrt \\epsilon$ fraction of the edges incident on S have one endpoint in L and one endpoint in R. (This can be seen as an analog of Cheeger's inequality for the smallest eigenvalue of the adjacency matrix of a graph.) Iterating this procedure yields the approximation results stated above. The algorithm of Goemans and Williamson, together with the SDP solver of Arora and Kale, give an approximation ratio of $.878$ in nearly linear tim...

  14. Hydraulic Cutting Technology of Sand Control Screen in Open-hole Horizontal Well%水平井裸眼段防砂管柱水力内切割技术探讨

    Institute of Scientific and Technical Information of China (English)

    李贵川; 章桂庭; 寇联星; 胡东锋

    2011-01-01

    打捞水平井裸眼段内砂卡的防砂筛管是十分复杂的作业,打捞钻具摩阻大,扭矩传递困难,需要改进和优化切割、套铣、倒扣等常规打捞技术,其中水力内切割防砂筛管是实现分段打捞的关键工艺.在分析常规水力内切割缺点的基础上,优化为水力与机械联合双控内切割工艺,并对刀片优选设计给出了理论计算公式,极大提高了水平井防砂筛管水力内切割作业一次成功率,具有现场指导意义.%It' s a very complex operation to let stuck sand control screens to be free and pull them out of open-hole horizontal well. Large friction,difficult torque transmission, which forced conventional fishing technology, such as jarring, back-off, cutting or milling, needs to be improved and optimized. Hydraulic cutting sand control screen is the key process to remove the section screen. Based on the analysis of conventional cutting defects,through combining hydraulic and mechanical method,dual control cutting process was well performed, and a set of theoretical formula for blade-length design was recommended. Hydraulic cutting sand screens in open-hole horizontal well,whose probability of cutting success was improved greatly,with strong on-site guidance.

  15. 激光模切加工新技术的实验研究%Experimental Study on New Technology of Laser Die-Cutting Processing

    Institute of Scientific and Technical Information of China (English)

    许宝忠; 刘铁根; 王萌; 李梅; 张国顺

    2011-01-01

    To improve the die-cutting process of the traditional packaging carton, experiments of laser die-cutting have been done. Details of the working principle of laser die-cutting were introdued, and scanning precision of the focusing was analyzed. A laser die-cutting system with galvanometer, radio frequency CO2 laser, hurrySCAN14 scan head, RTC3 card and so on is built, and laser die-cutting has been done with this system. Compared with traditional mechanical cutting, laser die-cutting has lots of advantages, such as convenience, agility, short production cycle and higher efficiency especially in the packaging of small quantities samples.%为了改进传统包装纸盒模切工艺,进行了激光模切的实验研究.详细介绍了激光模切的工作原理,对振镜扫描方式的聚焦误差进行了分析,在采用射频CO2激光器、hurrySCAN14扫描头和RTC3通用激光控制卡等构建的数控激光模切系统上,进行了激光模切技术的研究.与传统机械模切相比,激光模切在小批量样品的生产中具有方便、灵活、生产周期短和效率高等独特的优点.

  16. Three-dimensional welding and cutting using high-power CO2 or YAG laser

    Science.gov (United States)

    Zuo, Tiechuan; Chen, Jiming; Xiao, Rongshi; Bao, Yong

    2000-10-01

    In this paper, the theory of 3D laser welding and cutting was established firstly. Then the expert system for 3D laser processing and software of 3D laser processing CAD/CAM were developed, respectively. Under the guidance of these software, with high power CO2 laser, the 3D covers of a car have been cut and edge smoothed, which decrease the number of models and shorten the period of production. With adoption of this technology, the covers of extended Hong Qi cars and furthermore Da Hong Qi cars have been processed successfully, which will bring out the innovation of production design and the revolution of processing technology in manufacture industry.

  17. Influence of Alloying Elements on the Laser Cutting Process

    Science.gov (United States)

    Ivarson, Anders; Powell, John; Siltanen, Jukka

    This paper presents an experimental investigation into how different alloying elements affect the laser-oxygen cutting process. Small variations in chemical composition of the material can lead to major changes in the overall laser-oxygen cutting process. The changes can appear as differences in cut edge roughness and/or adherent dross on the bottom of the cut. The primary causes of the process sensitivity have been identified as changes in surface tension and viscosity of the molten material in combination with changes in the exothermal reaction in the cut zone.

  18. Cutting Craters

    Science.gov (United States)

    2003-01-01

    [figure removed for brevity, see original site] Released 12 November 2003The rims of two old and degraded impact craters are intersected by a graben in this THEMIS image taken near Mangala Fossa. Yardangs and low-albedo wind streaks are observed at the top of the image as well as interesting small grooves on the crater floor. The origin of these enigmatic grooves may be the result of mud or lava and volatile interactions. Variable surface textures observed in the bottom crater floor are the result of different aged lava flows.Image information: VIS instrument. Latitude -15.2, Longitude 219.2 East (140.8 West). 19 meter/pixel resolution.Note: this THEMIS visual image has not been radiometrically nor geometrically calibrated for this preliminary release. An empirical correction has been performed to remove instrumental effects. A linear shift has been applied in the cross-track and down-track direction to approximate spacecraft and planetary motion. Fully calibrated and geometrically projected images will be released through the Planetary Data System in accordance with Project policies at a later time. NASA's Jet Propulsion Laboratory manages the 2001 Mars Odyssey mission for NASA's Office of Space Science, Washington, D.C. The Thermal Emission Imaging System (THEMIS) was developed by Arizona State University, Tempe, in collaboration with Raytheon Santa Barbara Remote Sensing. The THEMIS investigation is led by Dr. Philip Christensen at Arizona State University. Lockheed Martin Astronautics, Denver, is the prime contractor for the Odyssey project, and developed and built the orbiter. Mission operations are conducted jointly from Lockheed Martin and from JPL, a division of the California Institute of Technology in Pasadena.

  19. Cutting Under Pressure Technology for the Tubing String with Dual Packer in Gas Well%带压切割气井双封分压管柱工艺技术∗

    Institute of Scientific and Technical Information of China (English)

    谢涛; 杨红斌; 徐迎新

    2015-01-01

    复杂多个大直径工具管柱、腐蚀管柱和带喷砂器的管柱带压起钻工艺尚无有效方法,为此,研发了带压切割气井双封分压管柱工艺技术。该工艺技术采用专门的带压切割装置,利用切割刀具在装置内逐段切割,带压起出切割掉的油管,下带压密封捞矛打捞切割掉的油管鱼头,逐级起出复杂管柱。现场试验结果表明,气井带压切割工艺可以实现ø73�0 mm N80油管双封分压管柱的带压切割;对于腐蚀穿孔和双封分压以上复杂管柱可以采取装置内分段切割、密封打捞及分级起出的技术方案。%There is still no effective method of tripping out complex multiple large diameter tool string, corro⁃sion string and string with sandblast under pressure, to address the issue, a technology of cutting dual packer iso⁃lation string in gas well has been developed�A special device capable of cutting string under pressure is used to cut the string by cutter�After tripping out the cut tubing string section, run fishing spear for snubbing operation to fish the tubing string in well, thus, tripping out the complex string piece by piece�Field tests show that the cutting un⁃der pressure technology for gas well is fully capable of cutting the ø73�0 mm N80 tubing string with dual packer un⁃der pressure�For corrosion perforation and the complex string upper dual packer, cutting into piece, fishing with sealing and tripping out piece by piece could be a solution.

  20. The Investigation of Tool Selection in High-speed Cutting Technology%高速切削技术中刀具选用问题探讨

    Institute of Scientific and Technical Information of China (English)

    张艳杰

    2012-01-01

    高速切削技术是20世纪90年代迅速走向实际应用的先进加工技术,高速切削刀具的选用是实现高速切削加工的关键技术之一。生产实践证明,高速切削刀具必须具备可靠的安全性和高的耐用度。文章从刀具材料、刀具结构、刀杆结构、刀具动平衡几个方面介绍了高速切削技术中刀具的选用。%High-speed cutting is a advanced processing technique that sprang into application during tile 1990s, and high-speed cutting tool technique is one of the key techniques to guarantee it. As is proved in practice, high-speed cutting tool must possess reliable security and durabihty. This paper deals with selection of cutting tool in respect of the material and structure of cutting tool, structure of handle, and dynamic equilibrium.

  1. The German way to an energy efficient future. Process and cross cutting technology improvements for CO{sub 2} reductions and a competitive economy

    Energy Technology Data Exchange (ETDEWEB)

    Radgen, P.

    1999-07-01

    The aim of the paper is to show how Germany tries to improve the energy efficiency of the economy and reduce carbon dioxide emissions without affecting the competitiveness of the industry. Between 1990 to 1995 Germany has reduced its CO{sub 2} emission from 1029 to 933 million tonnes, which is equivalent to an emission reduction of 9%. To analyse and compare different options to reach the emission reduction target, multiple tools have been developed and can be used to help in setting policy priorities. The IKARUS model and database together with the use of energy efficiency indicators helps to keep the development of energy consumption and emission reduction on track to the reduction target. Voluntary agreements between industry and government had been worked out, to limit the emissions in the energy intensive sectors of the German industry. Results from the monitoring of this efforts will be presented together with a short evaluation of the factors influencing the improvements in energy efficiency. As energy related emissions can be reduced significantly by closing energy and material flows, the effect of recycling of energy intensive materials such as steel, glass, plastics, and paper is discussed. The possible role of renewables as energy carrier and feedstock is evaluated for the production of surfactants. If more oleochemical surfactants could be applied, this will help to reduce the CO{sub 2} emissions from the use of fossil fuels as feedstock. The efficiency improvement by cross cutting technologies will be discussed for furnaces, compressed air systems and electric motors. Most of these improvement potentials are economic at present energy prices, but some barriers for their application has to be overcome. One way to help decision makers in industry is the use of energy benchmarking. Benchmarking helps to analyse the energy efficiency of the own company in comparison to the competitors and to set appropriate targets and to prepare a road map of measures to

  2. Effect of different moisturizing technology on the rooting of Ilex crenata ‘Golden Gem' cuttings%保湿方法对金叶龟甲冬青扦插生根的影响

    Institute of Scientific and Technical Information of China (English)

    史云光; 王珊; 史清云; 王以共; 胡玲; 魏峰; 胡萍; 张中伟

    2012-01-01

    The effect of rooting of Ilex crenata ‘Golden Gem' cuttings was studied by different moisturizing technology on the field trial.Three kinds of different moisturizing technology were used to culture the Ilex crenata ‘Golden Gem' cuttings.The results showed that the survival rate of cuttings,the rooting number and the average root length of Ilex crenata ‘Golden Gem' covered with plastic cup had been increased,with the survival rate of 90.3%,the root number of 16 and the average root length up to 11.2 cm,all at very significant level.The three treatments showed no significant difference in the length of root.For shoot cutting propagation of Ilex crenata ‘Golden Gem',the moisturizing technology of covering plastic cup was more suitable.%通过田间试验研究2种不同保湿方法对金叶龟甲冬青扦插生根的影响,筛选出最适合的扦插保湿方法。结果表明:用塑料杯覆盖处理金叶龟甲冬青,其扦插成活率、插条生根数、平均根长均有所提高,其中生根率达到了90.3%,生根数达到了16,平均根长达到了11.2 cm,均达到了极显著水平;生根所需时间3种处理无显著差异。金叶龟甲冬青嫩枝扦插繁殖,使用覆盖塑料杯的保湿方法较为适宜。

  3. Multibeam fiber laser cutting

    DEFF Research Database (Denmark)

    Olsen, Flemming Ove; Hansen, Klaus Schütt; Nielsen, Jakob Skov

    2009-01-01

    The appearance of the high power high brilliance fiber laser has opened for new possibilities in laser materials processing. In laser cutting this laser has demonstrated high cutting performance compared to the dominating Cutting laser, the CO2 laser. However, quality problems in fiber-laser...... cutting have until now limited its application to metal cutting. In this paper the first results of proof-of-principle Studies applying a new approach (patent pending) for laser cutting with high brightness and short wavelength lasers will be presented. In the approach, multibeam patterns are applied...... to control the melt flow out of the cut kerf resulting in improved cut quality in metal cutting. The beam patterns in this study are created by splitting up beams from two single mode fiber lasers and combining these beams into a pattern in the cut kerf. The results are obtained with a total of 550 W...

  4. Multibeam Fibre Laser Cutting

    DEFF Research Database (Denmark)

    Olsen, Flemming Ove

    The appearance of the high power high brilliance fibre laser has opened for new possibilities in laser materials processing. In laser cutting this laser has demonstrated high cutting performance compared to the dominating cutting laser, the CO2-laser. However, quality problems in fibre-laser...... cutting have until now limited its application in metal cutting. In this paper the first results of proof-of-principle studies applying a new approach (patent pending) for laser cutting with high brightness short wavelength lasers will be presented. In the approach, multi beam patterns are applied...... to control the melt flow out of the cut kerf resulting in improved cut quality in metal cutting. The beam patterns in this study are created by splitting up beams from 2 single mode fibre lasers and combining these beams into a pattern in the cut kerf. The results are obtained with a total of 550 W of single...

  5. Performance Enhancement of Abrasive Waterjet Cutting

    NARCIS (Netherlands)

    Vu Ngoc Pi

    2008-01-01

    Abrasive Waterjet (AWJ) Machining is a recent non-traditional machining process. This technology is widely used in industry for cutting difficult-to-machine-materials, milling slots, polishing hard materials etc. AWJ machining has many advantages, e.g. it can cut net-shape parts, no heat is generate

  6. Performance Enhancement of Abrasive Waterjet Cutting

    NARCIS (Netherlands)

    Vu Ngoc Pi

    2008-01-01

    Abrasive Waterjet (AWJ) Machining is a recent non-traditional machining process. This technology is widely used in industry for cutting difficult-to-machine-materials, milling slots, polishing hard materials etc. AWJ machining has many advantages, e.g. it can cut net-shape parts, no heat is

  7. Performance Enhancement of Abrasive Waterjet Cutting

    NARCIS (Netherlands)

    Vu Ngoc Pi

    2008-01-01

    Abrasive Waterjet (AWJ) Machining is a recent non-traditional machining process. This technology is widely used in industry for cutting difficult-to-machine-materials, milling slots, polishing hard materials etc. AWJ machining has many advantages, e.g. it can cut net-shape parts, no heat is generate

  8. 水射流钻割技术在防突方面的应用与研究%Research and Application of Water Jet Drilling Cutting Technology in Outburst Prevention

    Institute of Scientific and Technical Information of China (English)

    武文庆

    2014-01-01

    本文提出采用射流钻割一体化防突技术对高瓦斯矿井煤层进行卸压增透措施,并在某矿2120风巷碛头采用割缝钻孔与普通钻孔进行工业性实验,并利用G10模式煤气表对孔内瓦斯进行对比研究,证明水射流钻割割缝技术确实能明显的起到卸压增透效果,从而有效的预防煤层的突出事故。%In this paper,the jet drilling-cutting integration outburst prevention technology for pressure relief and permeability increasing measures in high gas coal mine,and in some mine 2120 wind tunnel moraine head adopts cutting drilling and drilling for industrial experiment,and using the G10 model of gas meter to make a comparative study of the hole of gas,water jet drilling cutting slotting technology can indeed obviously win the pressure relief and permeability increase effect,thus effectively preventing outburst in coal seam.

  9. Research Progress and Application of Superhard Nano-Micron PVD Coating Technology in the Cutting Manufacturing Area%超硬纳微米PVD涂层技术在刀具领域的应用及研究进展

    Institute of Scientific and Technical Information of China (English)

    张而耕; 朱州; 张体波

    2015-01-01

    ABSTRACT:The paper introduced the principle, characteristics, and advantages and disadvantages of three methods of vacuum evaporation, sputtering and ion plating in physical vapor deposition ( PVD) technology, and introduced the PVD coating technology that is widely used in cutting tools by four categories of binary, multiple coatings, multilayer coatings and nano multilayer composite coating. Based on a large amount of literature, combined with the author's experience in the research and application of PVD tech-nology for many years, the paper reviewed the research progress of superhard nano-micron PVD coating technology in the field of application of cutting tool from the most important perspective of improving the cutting tool life, and further discussed the multiple coating, multilayer coating and nanometer coating in details. Cutting tool surface with application of physical vapor deposition coa-ting technology enabled the tool to obtain excellent overall performance, which significantly improved the life of cutting tools, re-duced production costs, and increased the machining efficiency substantially. Finally, the paper forecasted the wide application of physical vapor deposition coating technology in composite superhard cutting ( including milling of mold steel, hardened steel whose hardness over HRC55 ) , cutting hard processing materials ( including high-temperature alloys, titanium alloy, stainless steel, etc. ) , machining and processing composite materials of graphite and carbon fiber, etc. and high-speedily machining non-ferrous metals ( including aluminum, copper alloys, nickel, etc. ) in the future.%介绍了物理气相沉积( PVD)技术的原理、特点和真空蒸镀、溅射镀和离子镀之间的优缺点,从二元涂层、多元涂层、多层涂层和纳米多层复合涂层等4种类别上介绍了PVD涂层技术在切削刀具上的广泛应用。在查阅和整理大量文献资料的基础上,也结合笔者多年从事PVD技术的

  10. Technology on CO2 Laser Cutting of LTCC Substrate%CO2激光切割LTCC基板工艺技术研究

    Institute of Scientific and Technical Information of China (English)

    王运龙; 宋夏; 邱颖霞; 王志勤

    2016-01-01

    针对LTCC基板进行CO2激光切割实验研究。分析激光功率、激光频率、切割速度及辅助气体压力等参数对切割宽度、深度及飞溅物的影响。阐述了LTCC中金属导体对切割的阻碍作用以及CO2激光的热效应对LTCC表层导体形貌及附着力的影响。%The cutting experiments for LTCC substrate are studied using CO2 laser. The effects of laser energy, repeat frequency, cutting speed and assistant gas pressure on the cutting width, depth and splatter are analyzed. Moreover, the block effect of LTCC electronic conductor in cutting process is expatiated, and the effects of CO2 laser heating on the morphology and adhesive force of LTCC electronic conductor are discussed.

  11. Effects of pulsed light treatments and pectin edible coatings on the quality of fresh-cut apples: a hurdle technology approach.

    Science.gov (United States)

    Moreira, María R; Álvarez, María V; Martín-Belloso, Olga; Soliva-Fortuny, Robert

    2017-01-01

    Pulsed light (PL) treatments stand as an alternative for the shelf-life extension of fresh-cut products. The antimicrobial effects of PL are well known; however, its influence on quality attributes needs to be assessed. This study was aimed at evaluating the application of PL treatments in combination with pectin-based edible coatings enriched with dietary fiber for the preservation of fresh-cut apples. Dipping of fresh-cut apples in ascorbic acid/calcium chloride solution prior to pectin coating and PL treatments was effective to minimize browning and softening of apple surfaces. Incorporation of fiber in the pectin coating did not cause any change in microbial loads and sensory acceptability of apple cubes. Pectin-coated PL-treated apple pieces exhibited significantly higher antioxidant activity values than fresh and PL control samples. At the end of storage, the combination of both treatments resulted in an almost 2 log CFU g(-1) reduction of microbial counts. Sensory attribute scores did not fall below the rejection limit throughout 14 days, although the presence of off-odors limited the acceptability of the pectin-coated samples. The results demonstrate that PL treatments applied to pectin-coated fresh-cut apples may be used to maintain quality attributes, thus conferring prebiotic potential and extending the shelf-life of the product. © 2016 Society of Chemical Industry. © 2016 Society of Chemical Industry.

  12. Research and application of fixed cutting angle threading technology%定起点车螺纹工艺研究及应用

    Institute of Scientific and Technical Information of China (English)

    姜源; 张阳; 常文涛; 李全会

    2013-01-01

      一种实现液压支架立柱螺纹定角度车削工艺,该工艺利用数控车螺纹时工件圆周上起刀点相对于主轴卡盘角度位置固定及可调原理,从而实现立柱上特征点(如上下腔接头)与螺纹起刀点位置角度相对固定,并最终得到在外导向套组装预紧后外导向套上腔接头与缸体特征点(如下腔接头)相对位置角度满足图纸设计要求。%This turning process cuts the hydraulic support column at a relatively fixed angle from feature points ,such as upper and lower chamber joints, against thread start-cutting point, by use of a mechanism that exist a fixed and adjustable angle of the start-cutting points at the Circumference of working pieces against the thread cutting-start point. The result is that, after the outer bush assembly pre-tightening, the relative position angle of outer bush upper chamber against cylinder feature points (such as the lower chamber joint) meets the design require-ments.

  13. CO2 laser cutting

    CERN Document Server

    Powell, John

    1998-01-01

    The laser has given manufacturing industry a new tool. When the laser beam is focused it can generate one of the world's most intense energy sources, more intense than flames and arcs, though similar to an electron beam. In fact the intensity is such that it can vaporise most known materials. The laser material processing industry has been growing swiftly as the quality, speed and new manufacturing possibilities become better understood. In the fore of these new technologies is the process of laser cutting. Laser cutting leads because it is a direct process substitu­ tion and the laser can usually do the job with greater flexibility, speed and quality than its competitors. However, to achieve these high speeds with high quality con­ siderable know how and experience is required. This information is usually carefully guarded by the businesses concerned and has to be gained by hard experience and technical understanding. Yet in this book John Powell explains in lucid and almost non­ technical language many o...

  14. Machining Challenges: Macro to Micro Cutting

    Science.gov (United States)

    Shunmugam, M. S.

    2016-04-01

    Metal cutting is an important machining operation in the manufacture of almost all engineering components. Cutting technology has undergone several changes with the development of machine tools and cutting tools to meet challenges posed by newer materials, complex shapes, product miniaturization and competitive environments. In this paper, challenges in macro and micro cutting are brought out. Conventional and micro end-milling are included as illustrative examples and details are presented along with discussion. Lengthy equations are avoided to the extent possible, as the emphasis is on the basic concepts.

  15. Cutting state identification

    Energy Technology Data Exchange (ETDEWEB)

    Berger, B.S.; Minis, I.; Rokni, M. [Univ. of Maryland, College Park, MD (United States)] [and others

    1997-12-31

    Cutting states associated with the orthogonal cutting of stiff cylinders are identified through an analysis of the singular values of a Toeplitz matrix of third order cumulants of acceleration measurements. The ratio of the two pairs of largest singular values is shown to differentiate between light cutting, medium cutting, pre-chatter and chatter states. Sequences of cutting experiments were performed in which either depth of cut or turning frequency was varied. Two sequences of experiments with variable turning frequency and five with variable depth of cut, 42 cutting experiments in all, provided a database for the calculation of third order cumulants. Ratios of singular values of cumulant matrices find application in the analysis of control of orthogonal cutting.

  16. New opportunities for cutting with lasers.

    Science.gov (United States)

    Renner, Thomas; Mairhörmann, Dieter

    2004-01-01

    Laser microcutting is a leading technology for the manufacture of surgical instruments and medical implants. This article assesses its capabilities for stents and surgical-needle manufacture and for other tube-cutting applications that require microscaled designs.

  17. 3rd International Conference on Computer & Communication Technologies

    CERN Document Server

    Bhateja, Vikrant; Raju, K; Janakiramaiah, B

    2017-01-01

    The book is a compilation of high-quality scientific papers presented at the 3rd International Conference on Computer & Communication Technologies (IC3T 2016). The individual papers address cutting-edge technologies and applications of soft computing, artificial intelligence and communication. In addition, a variety of further topics are discussed, which include data mining, machine intelligence, fuzzy computing, sensor networks, signal and image processing, human-computer interaction, web intelligence, etc. As such, it offers readers a valuable and unique resource.

  18. Recommender systems for technology enhanced learning research trends and applications

    CERN Document Server

    Manouselis, Nikos; Verbert, Katrien

    2014-01-01

    Presents cutting edge research from leading experts in the growing field of Recommender Systems for Technology Enhanced Learning (RecSys TEL) International contributions are included to demonstrate the merging of various efforts and communities Topics include: Linked Data and the Social Web as Facilitators for TEL Recommender Systems in Research and Practice, Personalised Learning-Plan Recommendations in Game-Based Learning and Recommendations from Heterogeneous Sources in a Technology Enhanced Learning Ecosystem

  19. The future of 3D printing technology in biomedicine

    OpenAIRE

    Iraj Nabipour

    2015-01-01

    3D printing, one of the hottest cutting-edge interdisciplinary technologies, is projected to have revenue of $8.4 billion in 2020. #D printing technology will implement the concept of personalized medicine in medical healthcare industry and pharmaceutical fabrication. Organ printing, which it is defined as computer-aided, jet based 3D tissue-engineering of living human organs, is an interesting and challengeable field for 3D printing. Customized implants and prostheses can be produced in any ...

  20. Editorial: Advanced Learning Technologies, Performance Technologies, Open Contents, and Standards - Some Papers from the Best Papers of the Conference ICCE C3 2009

    Directory of Open Access Journals (Sweden)

    Fanny Klett (IEEE Fellow

    2010-09-01

    Full Text Available This special issue deals with several cutting edge research outcomes from recent advancement of learning technologies. Advanced learning technologies are the composition of various related technologies and concepts such as i internet technologies and mobile technologies, ii human and organizational performance/knowledge management, and iii underlying trends toward open technology, open content and open education. This editorial note describes the overview of these topics related to the advanced learning technologies to provide the common framework for the accepted papers in this special issue.

  1. Simulation of Laser Cutting

    Science.gov (United States)

    Schulz, Wolfgang; Nießen, Markus; Eppelt, Urs; Kowalick, Kerstin

    Laser cutting is a thermal separation process widely used in shaping and contour cutting applications. There are, however, gaps in understanding the dynamics of the process, especially issues related to cut quality. This work describes the advances in fundamental physical modelling and process monitoring of laser cutting, as well as time varying processes such as contour cutting. Diagnosis of ripple and dross formation is advanced to observe the melt flow and its separation simultaneously as well as the spatial shape of the cut kerf.

  2. 磨料射流切割套管技术研究及在海上弃井中的应用%Casing Cutting Technology through Abrasive Water Jet and Its Applications in Offshore Abandoned Wells

    Institute of Scientific and Technical Information of China (English)

    陈建兵; 王超; 刘贵远; 刘作鹏; 罗甲全

    2013-01-01

    In order to efficiently and safely cut casing and structural poles below mudline in offshore wells ,abrasive water jet (AWJ) casing cutting technology has been developed to cut abandoned offshore fa-cilities .Based on technical advancement of AWJ cutting through multiple casing strings ,hydraulic motor driven and self-rotating water jet cutting device were developed for field applications .Parameters such as jet size ,pump pressure ,rotation speed ,abrasive material types ,etc .were optimized through systematic labora-tory tests and abrasive water jet cutting technique was formed .Full scale surface and downhole tests in the offshore Well CFD1 6 1 showed that this AWJ cutting device could cut through 4 cemented casing strings (sizes :φ244.5 ,φ339.7 ,φ508.0 and φ762.0 mm ) in less than 6 hours ,w hich met field application require-ments .In addition ,the system is compatible with engineering support vessel instead of mobile offshore drilling units so as to further reduce its cost .Its practical application shows the AWJ device with advanta-ges as strong cutting capability ,high cutting efficiency and environmental friendliness ,would provide a new offshore technical solution to abandonment of offshore oilfield facilities and structures in China .%为安全有效地从泥线以下切割海上废弃井套管和管桩,研究开发了磨料射流切割技术。基于高能磨料射流从套管串内部一次冲蚀切割多层管材的技术思路,设计了液压马达驱动式和水力自旋式切割装置,经过室内试验优化喷嘴、泵压、转速和磨料类型等参数,形成了配套的磨料射流切割多层套管工艺。地面综合切割试验及在曹妃甸161井的现场应用表明,该切割装置约在6 h内即可割断4层(φ244.5~φ762.0 mm)被水泥固为一体的套管,满足现场应用的要求,而且可利用工程船作业,能节省海洋钻机作业费用。实践证明,磨料射流切割技术具有切割能力

  3. International Conference on Emerging Research in Electronics, Computer Science and Technology

    CERN Document Server

    Sheshadri, Holalu; Padma, M

    2014-01-01

    PES College of Engineering is organizing an International Conference on Emerging Research in Electronics, Computer Science and Technology (ICERECT-12) in Mandya and merging the event with Golden Jubilee of the Institute. The Proceedings of the Conference presents high quality, peer reviewed articles from the field of Electronics, Computer Science and Technology. The book is a compilation of research papers from the cutting-edge technologies and it is targeted towards the scientific community actively involved in research activities.

  4. Extensions of cutting problems: setups

    Directory of Open Access Journals (Sweden)

    Sebastian Henn

    2013-08-01

    Full Text Available Even though the body of literature in the area of cutting and packing is growing rapidly, research seems to focus on standard problems in the first place, while practical aspects are less frequently dealt with. This is particularly true for setup processes which arise in industrial cutting processes whenever a new cutting pattern is started (i.e. a pattern is different from its predecessor and the cutting equipment has to be prepared in order to meet the technological requirements of the new pattern. Setups involve the consumption of resources and the loss of production time capacity. Therefore, consequences of this kind must explicitly be taken into account for the planning and control of industrial cutting processes. This results in extensions to traditional models which will be reviewed here. We show how setups can be represented in such models, and we report on the algorithms which have been suggested for the determination of solutions of the respective models. We discuss the value of these approaches and finally point out potential directions of future research.

  5. Realistic Virtual Cuts

    DEFF Research Database (Denmark)

    Laursen, Lasse Farnung

    Pigs and pig meat are major sources of income for Denmark. As one of the country's primary exports, it is no wonder that Denmark strives to maintain its competitive edge in the meat market. As part of an on-going effort to lower costs and maintain high standards, X-ray computed tomography (CT...... technology in the product prototyping process. In broad terms, the focus can be divided into two areas of focus: visualization and interaction. Visualizing volume data, obtained via CT-scanning, is a common area of research within other areas of research, e.g. for medical applications. The availability...... when concerned with product development. Product earnings projection, product specifications, and interactive training are just a few of the applicable areas. In this thesis we present an interaction method intended for the commercial development of meat product prototypes. The interaction method...

  6. Butanol biorefineries: Use of novel technologies to produce biofuel butanol from sweet sorghum bagasse (SSB)

    Science.gov (United States)

    In order to produce butanol biofuel at a competitive price, agricultural residues such as SSB should be used. This feedstock was studied as a substitute to corn to lower feedstock costs and broaden beyond a food crop. In addition, cutting edge science & technology was applied. In these studies we us...

  7. Layout decomposition and synthesis for a modular technology to solve the edge-placement challenges by combining selective etching, direct stitching, and alternating-material self-aligned multiple patterning processes

    Science.gov (United States)

    Liu, Hongyi; Han, Ting; Zhou, Jun; Chen, Yijian

    2016-03-01

    To overcome the prohibitive barriers of edge-placement errors (EPE) in the cut/block/via step of complementary lithography, we propose a modular patterning approach by combining layout stitching, selective etching, and alternating-material self-aligned multiple patterning (altSAMP) processes. In this patterning approach, altSAMP is used to create line arrays with two materials alternatively which allow a highly selective etching process to remove one material without attacking the other, therefore more significant EPE effect can be tolerated in line-cutting step. With no need of connecting vias, the stitching process can form 2-D features by directly stitching two components of patterns together to create 2-D design freedom as well as multiple-CD/pitch capability. By adopting this novel approach, we can potentially achieve higher processing yield and more 2-D design freedom for continuous IC scaling down to 5 nm. We developed layout decomposition and synthesis algorithms for critical layers, and the fin/gate/metal layer from NSCU open cell library is used to test the proposed algorithms.

  8. New Tool Coatings for Light Metal Cutting

    Institute of Scientific and Technical Information of China (English)

    DaveDoerwald; ThomasKrug; RoelTietema; Wei-MingSim; QuanshunLuo; PapkenHovsepian

    2004-01-01

    New carbon based coatings have been developed for cutting of light metals such as aluminum. These coatings can be used either directly on the tool or as topcoating combined with another hard base coating. Cutting tests show that the coating gives good performance for materials that tend to stick to the cutting tools, such as aluminium alloys, because of the substantial reduction of appearance of the so-called built-up edge (BUE). This results in a longer life time of the tool and smoother surface finish of the cut made in the work-piece material. Especially in dry machining and deep hole drilling this coating performed very well. An overview of the properties and initial cutting results of this coating will be presented. This paper will also present results from recent industrial field tests carried out by a leading European aerospace manufacturer. Cutting forces, BUE formation and surface roughness data will be presented to explain the cutting process during dry machining.

  9. New Tool Coatings for Light Metal Cutting

    Institute of Scientific and Technical Information of China (English)

    Dave Doerwald; Thomas Krug; Roel Tietema; Wei-Ming Sim; Quanshun Luo; Papken Hovsepian

    2004-01-01

    New carbon based coatings have been developed for cutting of light metals such as aluminum. These coatings can be used either directly on the tool or as topcoating combined with another hard base coating. Cutting tests show that the coating gives good performance for materials that tend to stick to the cutting tools, such as aluminium alloys, because of the substantial reduction of appearance of the so-called built-up edge (BUE). This results in a longer life time of the tool and smoother surface finish of the cut made in the work-piece material. Especially in dry machining and deep hole drilling this coating performed very well. An overview of the properties and initial cutting results of this coating will be presented. This paper will also present results from recent industrial field tests carried out by a leading European aerospace manufacturer.Cutting forces, BUE formation and surface roughness data will be presented to explain the cutting process during dry machining.

  10. Soft Cutting Propagation Technology of Ulmus pumila ‘Zhonghuajinye’%中华金叶榆嫩枝扦插繁殖技术1)

    Institute of Scientific and Technical Information of China (English)

    徐笑玥; 佟兆庆; 闫文涛; 陆秀君; 李常猛

    2016-01-01

    以中华金叶榆( Ulmus pumila‘Jinye’)为试材,剪取当年生枝条中上部做插穗,每个插穗保留2片叶子,用ABT 1000 mg· L-1溶液处理插穗10 s,分别扦插在河沙、珍珠岩、蛭石、草炭、V(珍珠岩)∶V(蛭石)=1∶1、V (珍珠岩)∶V(蛭石)=3∶1、V(珍珠岩)∶V(草炭)=1∶1、V(珍珠岩)∶V(草炭)=3∶1,8种基质上,探究不同扦插基质对插穗生根的影响;采用3因素3水平正交试验设计,即选用ABT、IBA、NAA 3种生根促进剂,每种生根促进剂设计500、1000、1500 mg· L-13个质量浓度梯度,处理时间为10、30、60 s,扦插在V(珍珠岩)∶V(蛭石)=1∶1的基质中,筛选金叶榆嫩枝扦插最佳生根促进剂及处理时间。结果表明:蛭石为最佳基质,插穗生根率为89.17%,平均根数为10条,平均根长为12.92 cm,最长根长为38.5 cm。正交试验结果表明:用质量浓度为500 mg· L-1的IBA生根促进剂处理30 s得到的生根效果较好,生根率为82.22%,平均根长为21.12 cm,平均根数为17条。通过spss软件中的多重比较法分析推测得出,采用1500 mg· L-1 IBA生根促进剂处理插穗基部30 s,得到的金叶榆插穗生根率将会更高。%With Ulm us pumila‘Zhonghuajinye ’ , and one-year branches of the upper part as stem cuttings , each stem cutting retained two leaves .In order to test the influence of different substrates on cutting , stem cuttings were treated with ABT of 1 000 mg· L-1 solution for 10 s and inserted into eight soil substrates including river sand , perlite, vermiculite, peat, per-lite∶vermiculite=1∶1, perlite ∶vermiculite=3∶1, perlite ∶peat=1∶1, and perlite ∶peat=3∶1 ( V/V) , respective-ly.With the purpose of screening the best reagent concentration and the best treatment time for U.pumila‘Zhonghuajinye’ cutting, the experiment was conducted using three

  11. Cutting of Stainless Steel With Fiber and Disk Laser

    DEFF Research Database (Denmark)

    Wandera, Catherine; Salminen, Antti; Olsen, Flemming Ove

    2006-01-01

    Laser cutting is a major application of laser materials processing. The cutting is usually performed with CO2-laser due to its good beam quality and its relatively low costs of ownership. Ever since entering the market the high power solid state lasers have been expected to achieve a dominating...... of both of the new lasers against traditional CO2-laser. The results showed that the new lasers offer a great potential in improving the productivity of cutting phase with an acceptable edge quality. This is emphasized in thin sheets of 1.3 and 2.3 mm thickness. In that case the width of the cut kerf...... of each thickness. The results were very promising and it can be stated that these new laser types have a great potential in cutting and will probably gain a considerable market share not only in 3D cutting applications but also in ordinary flat sheet cutting....

  12. Robot based deposition of WC-Co HVOF coatings on HSS cutting tools as a substitution for solid cemented carbide cutting tools

    Science.gov (United States)

    Tillmann, W.; Schaak, C.; Biermann, D.; Aßmuth, R.; Goeke, S.

    2017-03-01

    Cemented carbide (hard metal) cutting tools are the first choice to machine hard materials or to conduct high performance cutting processes. Main advantages of cemented carbide cutting tools are their high wear resistance (hardness) and good high temperature strength. In contrast, cemented carbide cutting tools are characterized by a low toughness and generate higher production costs, especially due to limited resources. Usually, cemented carbide cutting tools are produced by means of powder metallurgical processes. Compared to conventional manufacturing routes, these processes are more expensive and only a limited number of geometries can be realized. Furthermore, post-processing and preparing the cutting edges in order to achieve high performance tools is often required. In the present paper, an alternative method to substitute solid cemented carbide cutting tools is presented. Cutting tools made of conventional high speed steels (HSS) were coated with thick WC-Co (88/12) layers by means of thermal spraying (HVOF). The challenge is to obtain a dense, homogenous, and near-net-shape coating on the flanks and the cutting edge. For this purpose, different coating strategies were realized using an industrial robot. The coating properties were subsequently investigated. After this initial step, the surfaces of the cutting tools were ground and selected cutting edges were prepared by means of wet abrasive jet machining to achieve a smooth and round micro shape. Machining tests were conducted with these coated, ground and prepared cutting tools. The occurring wear phenomena were analyzed and compared to conventional HSS cutting tools. Overall, the results of the experiments proved that the coating withstands mechanical stresses during machining. In the conducted experiments, the coated cutting tools showed less wear than conventional HSS cutting tools. With respect to the initial wear resistance, additional benefits can be obtained by preparing the cutting edge by means

  13. How to Train a Cell–Cutting-Edge Molecular Tools

    Science.gov (United States)

    Czapiński, Jakub; Kiełbus, Michał; Kałafut, Joanna; Kos, Michał; Stepulak, Andrzej; Rivero-Müller, Adolfo

    2017-01-01

    In biological systems, the formation of molecular complexes is the currency for all cellular processes. Traditionally, functional experimentation was targeted to single molecular players in order to understand its effects in a cell or animal phenotype. In the last few years, we have been experiencing rapid progress in the development of ground-breaking molecular biology tools that affect the metabolic, structural, morphological, and (epi)genetic instructions of cells by chemical, optical (optogenetic) and mechanical inputs. Such precise dissection of cellular processes is not only essential for a better understanding of biological systems, but will also allow us to better diagnose and fix common dysfunctions. Here, we present several of these emerging and innovative techniques by providing the reader with elegant examples on how these tools have been implemented in cells, and, in some cases, organisms, to unravel molecular processes in minute detail. We also discuss their advantages and disadvantages with particular focus on their translation to multicellular organisms for in vivo spatiotemporal regulation. We envision that further developments of these tools will not only help solve the processes of life, but will give rise to novel clinical and industrial applications. PMID:28344971

  14. Cutting edge clinical applications in cardiovascular magnetic resonance

    Science.gov (United States)

    De Cecco, Carlo N; Muscogiuri, Giuseppe; Varga-Szemes, Akos; Schoepf, U Joseph

    2017-01-01

    Today, the use of cardiovascular magnetic resonance (CMR) is widespread in clinical practice. The increased need to evaluate of subtle myocardial changes, coronary artery anatomy, and hemodynamic assessment has prompted the development of novel CMR techniques including T1 and T2 mapping, non-contrast angiography and four dimensional (4D) flow. T1 mapping is suitable for diagnosing pathologies affecting extracellular volume such as myocarditis, diffuse myocardial fibrosis and amyloidosis, and is a promising diagnostic tool for patients with iron overload and Fabry disease. T2 mapping is useful in depicting acute myocardial edema and estimating the amount of salvageable myocardium following an ischemic event. Novel angiography techniques, such as the self-navigated whole-heart or the quiescent-interval single-shot sequence, enable the visualization of the great vessels and coronary artery anatomy without the use of contrast material. The 4D flow technique overcomes the limitations of standard phase-contrast imaging and allows for the assessment of cardiovascular hemodynamics in the great arteries and flow patterns in the cardiac chambers. In conclusion, the future of CMR is heading toward a more reliable quantitative assessment of the myocardium, an improved non-contrast visualization of the coronary artery anatomy, and a more accurate evaluation of the cardiac hemodynamics. PMID:28144400

  15. How to Train a Cell - Cutting-Edge Molecular Tools

    Science.gov (United States)

    Czapiński, Jakub; Kiełbus, Michał; Kałafut, Joanna; Kos, Michał; Stepulak, Andrzej; Rivero-Müller, Adolfo

    2017-03-01

    In biological systems, the formation of molecular complexes is the currency for all cellular processes. Traditionally, functional experimentation was targeted to single molecular players in order to understand its effects in a cell or animal phenotype. In the last few years, we have been experiencing rapid progress in the development of ground-breaking molecular biology tools that affect the metabolic, structural, morphological, and (epi)genetic instructions of cells by chemical, optical (optogenetic) and mechanical inputs. Such precise dissection of cellular processes is not only essential for a better understanding of biological systems, but will also allow us to better diagnose and fix common dysfunctions. Here, we present several of these emerging and innovative techniques by providing the reader with elegant examples on how these tools have been implemented in cells, and, in some cases, organisms, to unravel molecular processes in minute detail. We also discuss their advantages and disadvantages with particular focus on their translation to multicellular organisms for in vivo spatiotemporal regulation. We envision that further developments of these tools will not only help solve the processes of life, but will give rise to novel clinical and industrial applications.

  16. Cutting edge pre-intermediate : workbook : with key

    CERN Document Server

    Moor, Peter

    2003-01-01

    Consolidates and extends essential language covered in the Students' Book. Improve your writing' and 'Listen and read' sections systematically develop skills. Pronunciation and spelling sections improve student confidence in typical problem areas. Accompanied by an optional Student Cassette/Audio CD with exercises on grammar and pronunciation. Includes answer key

  17. At the service of cutting-edge research

    CERN Multimedia

    ISS Magazine

    2012-01-01

    Many external companies work for CERN, including ISS, a market leader in the area of service provision. In an article, republished in full below, due to appear in the next edition of the ISS Magazine, the company puts CERN in the spotlight. Take a moment to discover how an external company sees CERN.   CERN is a world-renowned research facility. ISS, with its 100-strong workforce ensures that the scientists can concentrate 100% on science. Since 1954, scientists from all corners of the globe have been seeking out the origins of the Universe at CERN, the European Laboratory for Particle Physics. CERN has been responsible for ground-breaking discoveries and inventions, such as the Worldwide Web in 1989. The task entrusted to ISS by CERN is as unusual as the laboratory is extraordinary. What started as a simple window-cleaning contract in 1967 has now evolved into a complex logistics operation. Keeping storage costs low For the past 25 years, ISS have been organising CERN's stores management...

  18. Cutting edge science: Laser surgery illuminates viscoelasticity of merotelic kinetochores.

    Science.gov (United States)

    Cabello, Simon; Gachet, Yannick; Tournier, Sylvie

    2016-03-28

    Increasing evidence in eukaryotic cells suggests that mechanical forces are essential for building a robust mitotic apparatus and correcting inappropriate chromosome attachments. In this issue, Cojoc et al. (2016. J. Cell Biol., http://dx.doi.org/10.1083/jcb.201506011) use laser microsurgery in vivo to measure and study the viscoelastic properties of kinetochores.

  19. Cutting-Edge Science from Arecibo Observatory: Introduction

    Science.gov (United States)

    Schmelz, Joan T.

    2017-01-01

    The Arecibo Observatory is home to the largest radio telescope in the world operating above 2 GHz, where molecule emission pertaining to the origins of life proliferate. It also houses the most powerful radar system on the planet, providing crucial information for the assessment of impact hazards of near-Earth asteroids (NEA). It was built to study the ionosphere with a radar system that can also monitor the effects of Space Weather and climate change. Arecibo has a proven track record for doing excellent science, even after 50 years of operations. This talk will include brief summaries of several Arecibo astronomy topics including the (1) latest attempts to resolve the Pleiades distance controversy, which include VLBI and Gaia; (2) galactic and extragalactic molecules; and (3) Arecibo 3D orbit determinations of potentially hazardous asteroids, and the crucial observation required to select Bennu as the target for the recently launched NASA OSIRIS-REx mission. This introduction will set the stage for the invited talks in this session, which include such topics as Fast Radio Bursts, galactic and extragalactic HI results, the pulsar emission problem, and NANOGrav. This work is supported by NSF and NASA.

  20. Mobile ad hoc networking the cutting edge directions

    CERN Document Server

    Basagni, Stefano; Giordano, Silvia; Stojmenovic, Ivan

    2013-01-01

    ""An excellent book for those who are interested in learning the current status of research and development . . . [and] who want to get a comprehensive overview of the current state-of-the-art.""-E-Streams This book provides up-to-date information on research and development in the rapidly growing area of networks based on the multihop ad hoc networking paradigm. It reviews all classes of networks that have successfully adopted this paradigm, pointing out how they penetrated the mass market and sparked breakthrough research. Covering both physical issues and applica

  1. New Glass Serves as Window to Cutting-edge Lasers

    Science.gov (United States)

    2004-01-01

    Since 1997, Marshall Space Flight Center s Electrostatic Levitator (ESL) facility has been used to study the characteristics of new metals, ceramics, and glass compounds - in both their hot molten states and as they are cooled to form solid materials. The ESL provides a unique way to test such substances without having to make contact with a container or crucible that would contaminate the sample. Simply put, objects analyzed in the levitator's chamber float in mid-air with no visible means of support or containment, suspended only by static electricity. While a sample object is levitated, a laser beam heats it until it melts so that scientists can measure its physical properties without interference from a container.

  2. Diffusivity in multiple sclerosis lesions: At the cutting edge?

    Directory of Open Access Journals (Sweden)

    Alexander Klistorner

    2016-01-01

    Conclusion: Distinct patterns of diffusivity within the central and peripheral components of MS lesions suggest that axonal loss dominates in the T1 hypointense core. The effects of de/remyelination may be more readily detected in the “T2-rim”, where there is relative preservation of structural integrity. Identifying and separating those patterns has an important implication for clinical trials of both neuroprotective and, in particular, remyelinating agents.

  3. The Cutting Edge: Workplace English. Section I: Project Handbook.

    Science.gov (United States)

    El Paso Community Coll., TX. Literacy Center.

    A model workplace literacy program of El Paso Community College (Texas), in cooperation with Levi Strauss and Company, is described. The partnership designed a three-part, job-specific, video-based curriculum in English as a Second Language (ESL) for garment industry workers, implemented in seven local plants. The 18-month program had these goals:…

  4. Continuing Education at the Cutting Edge: Promoting Transformative Knowledge Translation

    Science.gov (United States)

    McWilliam, Carol L.

    2007-01-01

    As the evidence-based practice movement gains momentum, continuing education practitioners increasingly confront the challenge of developing and conducting opportunities for achieving research uptake. Recent thinking invites new approaches to continuing education for health professionals, with due consideration of what knowledge merits uptake by…

  5. The surgeon and self-harm: at the cutting edge.

    Science.gov (United States)

    Kinahan, James C; MacHale, Siobhan

    2014-12-01

    Surgeons frequently treat the consequences of self-harm. Self-harm is a common problem and presentations to Irish hospitals are increasing. It increases the risk of suicide and is associated with long term morbidity. Appropriate management can improve the prognosis. Surgeons require a number of skills to appropriately manage patients who self-harm. In this review we outline those skills including diagnosis, communication, capacity and risk assessment.

  6. Treatment of venous malformations (VM): The cutting edge knowledge

    Institute of Scientific and Technical Information of China (English)

    Laurence M. Boon

    2005-01-01

    Venous malformations (VMs) are problematic common vascular malformations that are challenging even for experienced physicians. Several treatments are available including sclerotherapy, surgery, laser or combinations of these procedures. As none of these is specific, we still need therapies that would allow to cure these patients without complications. Hopefully, the unraveling of the causative defects of VMs will give us new tools for the management of this difficult condition.

  7. Cutting edge advanced : student's book : with phrase-builder

    CERN Document Server

    Cunningham, Sarah; Comyns Carr, Jane

    2003-01-01

    A focus on high-frequency useful vocabulary helps students say what they want to say. Regular, well-structured speaking tasks encourage students to express themselves more extensively and fluently. ‘Do You Remember’ sections in every unit and extra. Consolidation modules provide regular review and consolidation Student Books include Mini-Dictionary to help learners study independently.

  8. Magnetic pulse welding on the cutting edge of industrial applications

    Directory of Open Access Journals (Sweden)

    R. M. Miranda

    2014-03-01

    Full Text Available Magnetic Pulse Welding (MPW applies the electromagnetic principles postulated in the XIXth century and later demonstrated. In recent years the process has been developed to meet highly demanding market needs involving dissimilar material joining, specially involving difficult-to-weld materials. It is a very high speed joining process that uses an electromagnetic force to accelerate one material against the other, resulting in a solid state weld with no external heat source and no thermal distortions. A high power source, the capacitor, a discharge switch and a coil constitute the minimum equipment necessary for this process. A high intensity current flowing through a coil near an electrically conductive material, locally produce an intense magnetic field that generates eddy currents in the flyer according to Lenz law. The induced electromotive force gives rise to a current whose magnetic field opposes the original change in magnetic flux. The effect of this secondary current moving in the primary magnetic field is the generation of a Lorentz force, which accelerates the flyer at a very high speed. If a piece of material is placed in the trajectory of the flyer, the impact will produce an atomic bond in a solid state weld. This paper discusses the fundamentals of the process in terms of phenomenology and analytical modeling and numerical simulation. Recent industrial applications are presented in terms of materials, joint configurations and real examples as well as advantages and disadvantages of the process.

  9. 石门揭穿严重突出危险煤层防突技术研究%Study on Outburst Prevention Technology in Opening Seam with Serious Dangerous Outburst of Cross-cut

    Institute of Scientific and Technical Information of China (English)

    李宗福; 周声才; 龙建明; 李文树; 陈久福; 张赛

    2011-01-01

    为了解决由于松藻矿区地质条件复杂,煤层透气性系数低,地质构造带揭煤地点的地应力、构造应力、瓦斯压力大而导致揭煤时突出危险性增加,揭煤周期长的问题,提出采用超前探测、预测预报、高压水力割缝增透、底板瓦斯巷超前预抽、环形金属骨架钻孔注浆、锚网锚索喷浆加强支护、渐近式的综合石门揭煤技术,并在渝阳煤矿进行了应用。结果表明:采用综合石门揭煤技术瓦斯平均抽采浓度比未割缝钻孔平均抽采浓度提高59%,高压水力割缝后单孔平均抽采纯量增大2.92倍,揭煤时间缩短了17 d。%In order to solve the outburst danger increased and the long seam opening period during the seam opening occurred by the high ground stress,high structure stress and high gas pressure at the seam opening location of the geological structure zone,the lower seam permeability coefficient and the complicated geological conditions of the Songzao Mining Area,the application of the pilot exploration,the prediction and pre-warning,the high pressurized hydraulic slot cutting for the permeability improvement,the pilot gas pre-drainage from the floor of the gateway,the ring metal support frame,the bolt-steel mesh-anchor-shotcreting reinforced support and the asymptotic type comprehensive cross-cut seam opening technology were provided and applied to Yuyang Mine.The results showed that with the application of the comprehensive cross-cut seam opening technology,the gas average drainage density was improved by 59% than the average drainage density with no slot cutting boreholes.After the high pressurized hydraulic slot cutting,the average drainage pure quantity per borehole was improved by 2.92 times and the seam opening time was reduced by 17 days.

  10. Development of planar detectors with active edge

    Energy Technology Data Exchange (ETDEWEB)

    Povoli, M., E-mail: povoli@disi.unitn.it [Dipartimento di Ingegneria e Scienza dell' Informazione, Universita di Trento, Via Sommarive, 14, I-38123 Povo di Trento (Italy); INFN, Sezione di Padova (Gruppo Collegato di Trento) (Italy); Bagolini, A.; Boscardin, M. [Fondazione Bruno Kessler, Centro per i Materiali e i Microsistemi (FBK-CMM), Via Sommarive, 18, I-38123 Povo di Trento (Italy); Dalla Betta, G.-F. [Dipartimento di Ingegneria e Scienza dell' Informazione, Universita di Trento, Via Sommarive, 14, I-38123 Povo di Trento (Italy); INFN, Sezione di Padova (Gruppo Collegato di Trento) (Italy); Giacomini, G.; Vianello, E.; Zorzi, N. [Fondazione Bruno Kessler, Centro per i Materiali e i Microsistemi (FBK-CMM), Via Sommarive, 18, I-38123 Povo di Trento (Italy)

    2011-12-01

    We report on the first batch of planar active edge sensors fabricated at Fondazione Bruno Kessler (Trento, Italy) on the way to the development of full 3D detectors with active edges. The main design and technological aspects are reported, along with selected results from the electrical characterization of detectors and test structures.

  11. Laser cutting preparation technology of solid wood parquet laminate flooring%拼花实木复合地板激光切割制备工艺研究

    Institute of Scientific and Technical Information of China (English)

    赵洪刚; 乐磊; 刘明利; 吴俊华; 刘彦龙

    2016-01-01

    This study adopted orthogonal experiment to confirm the optimum technological parameters of laser cutting of solid wood parquet laminate flooring. We took tree species, focal distance, cutting speed, light intensity and cutting angle as design factors of the scheme and seam width, seam depth and ablation degree as evaluation indexes, the stereomicroscope was used to test the result. The result showed that influencing factors on the seam width from strong to weak followed the order of focal distance > cutting angle > cutting speed > tree species > light intensity, and the optimum conditions were A4 B4 C5 D1 E1 , in which focal distance had a great effect on seam width. The factors influencing ablation degree were ranked from high to low as focal distance > cutting speed > cutting angle > tree species > light intensity, and the optimum conditions were A1 B1 C2 D5 E4 , in which focal distance had a great influence on ablation degree. The factors impacting seam depth were ranked from strong to weak as cutting speed >tree species > focal distance > light intensity > cutting angle, and the optimum conditions were A5 B4 C1 D5 E5 . Because of interaction of various factors, there was no remarkable influencing factor to seam depth. Laser cutting parameters of oak face veneer were:focal distance 6. 0 mm, cutting speed 30 mm/s, and light intensity 75-80 cd. Laser cutting parameters of Fraxinus mandschurica face veneer were focal distance 6. 0-7. 5 mm, cutting speed 30-40 mm/s, and light intensity 40-60 cd. Reasonable use of cutting parameters may acquire good cutting quality, reduce or have no need of subsequent processing crafts so as to fulfill the demands of parquet flooring such as covering ablation degree and handling the gaps.%为确定激光切割拼花实木复合地板的优化工艺参数,采用正交试验法,以树种、焦距、切割速度、光强和切割角度为因素设计试验方案,以缝宽、缝深、烧蚀程度为评价指

  12. Atomic Study on Some Problems in Nanometric Cutting Mechanism

    Institute of Scientific and Technical Information of China (English)

    2000-01-01

    An investigation of some problems such as chip formation and surface generation in nanometric cutting mechanism based on molecular dynamics(MD) simulation is presented.It shows that chip formation is similar to that observed in macro-scale cutting.The movement of some micro-dislocation is the main cause of formation of chip and surface.Surface generation is notably affected by very small cutting force vibration.The highest stress appears in tool cutting edge,and it may cause wear,so it is necessary to build a MD model of tool wear.

  13. 对21世纪大庆油田开发前沿技术发展的初步思考%Preliminary Thinking on Leading Edge Technology Development of Daqing Oil Field in the 21st Century

    Institute of Scientific and Technical Information of China (English)

    巢华庆

    2001-01-01

    In the 21st century, Daqing oil field has to face new challenges mainly reflected in: (1)Unbalance in reserve-production ratio is tending to be serious after recovering cumulative productidon 70.32% of petroleum recoverable reserve; (2) Development difficulty increasing dramatically, with overall economic benefit getting poor;and (3) More strict requiements must be put forward in recognization and restructuring, due to the fact that market competition becomes more intense. From now on, the key work during development of Daqing oil field will be coverted from petroleum production rates to economic benefit, and overall targets will be coverted from continuous stable production to sustainable development, leading edge technology development in two levels will be accelerated. One level is about recent leading edge technology, focusing on increasing the employment percentage of and the total oil produced over the proved OOIP, which includes 3 sets of core techniques: (1)A complete set of techniques for improving waterflooding recovery factor at late high water cut stage; (2)Polymer flooding combined with ASP technique;and (3) Completion set of techniques for effective development of peripherial low permeability, low reserve richness and low single well productivity reservoirs. Another level is mainly about oil field long-term development requirements in the 21st century, focusing on new exploration and investigation in three directions: (1)Foam flooding, microbial flooding and other replacing new techniques after EOR; (2)Related techniques for effective development of newly incremental proved reserves in deep tight natural gas reservoir and complex fault-block oil and gas reservoirs;and (3)Related techniques required by market development for oil fields both at home and abroad. In the future, focus will be put on improving overall economic benefit of developing Daqing oil field through energetically developing and applying advanced hydrocarbon recovery techniques

  14. Demonstrating diamond wire cutting of the TFTR

    Energy Technology Data Exchange (ETDEWEB)

    Rule, K.; Perry, E.; Larson, S.; Viola, M. [and others

    2000-02-24

    The Tokamak Fusion Test Reactor (TFTR) ceased operation in April 1997 and decommissioning commenced in October 1999. The deuterium-tritium fusion experiments resulted in contaminating the vacuum vessel with tritium and activating the materials with 14 Mev neutrons. The total tritium content within the vessel is in excess of 7,000 Curies while dose rates approach 50 mRem/hr. These radiological hazards along with the size of the Tokamak (100 cubic meters) present a unique and challenging task for dismantling. Plasma arc cutting is the current baseline technology for the dismantlement of fission reactors. This technology is typically used because of its faster cutting times. Alternatively, an innovative approach for dismantlement of the TFTR is the use of diamond wire cutting technology. Recent improvements in diamond wire technology have allowed the cutting of carbon steel components such as pipe, plate, and tube bundles in heat exchangers. Some expected benefits of this technology include: significantly reduction in airborne contaminates, reduced personnel exposure, a reduced risk of spread of tritium contamination, and reduced overall costs as compared to using plasma arc cutting. This paper will provide detailed results of the diamond wire cutting demonstration that was completed in September of 1999, on a mock-up of this complex reactor. The results will identify cost, safety, industrial and engineering parameters, and the related performance of each situation.

  15. Simulation and Experimental Research on Cutting Force of Turning Titanium Alloy

    Directory of Open Access Journals (Sweden)

    Zheng Qingchun

    2015-01-01

    Full Text Available This paper mainly establishes a two-dimensional model about the YG8 carbide tool turning TC4 titanium alloy on the basis of ABAQUS. The cutting force of the simulation model was verified by the turning experiment, and the relationships of cutting force with cutting speed, feed rate and rake angle of cutting edge in the model were studied. A prediction model of main cutting force related to cutting speed, feed rate and rake angle was obtained by central composite experiment. Studies have shown that the difference between the cutting force acquired by simulation and by experiment was less than 10%; in a certain range, the cutting force increased with the feed rate, the cutting force decreased with the increase of cutting speed and rake angle, and the influence of feed rate to cutting force was most significant.

  16. Lithium iron phosphate battery electrode integrity following high speed pulsed laser cutting

    Science.gov (United States)

    Lutey, Adrian H. A.; Fiorini, Maurizio; Fortunato, Alessandro; Carmignato, Simone

    2015-05-01

    Laser exposures are performed on lithium iron phosphate battery electrodes at with process parameters based on those leading to the smallest heat affected zone for low power laser exposure at . Scanning electron microscopy and Raman analysis are performed along the resulting cut edges to characterize macroscopic, chemical and microstructural changes resulting from laser exposure. The increase in velocity with respect to previous studies is found to limit macroscopic changes to areas directly exposed to the laser beam and greatly suppress or completely eliminate microstructural and chemical changes resulting from thermal conduction effects in the metallic conductor layers. These results confirm laser technology as a viable, more flexible solution to mechanical blanking devices for the cutting of lithium iron phosphate battery electrode films.

  17. Characterisation of debris from laser and mechanical cutting of bone.

    Science.gov (United States)

    Rachmanis, Nikolaos; McGuinness, Garrett B; McGeough, Joseph A

    2014-07-01

    Laser cutting of bones has been proposed as a technology in orthopaedic surgery. In this short study, the laser-bone interaction was examined using a pulsed erbium-doped yttrium aluminium garnet laser and compared to a conventional cutting technique. Microscopic analysis revealed the nature of waste debris and showed higher proportions of finer particles for conventional sagittal sawing compared to laser cutting.

  18. An Experimental Study of the Cutting Forces in Metal Turning

    Directory of Open Access Journals (Sweden)

    Zoltan Iosif Korka

    2013-09-01

    Full Text Available Cutting forces are classified among the most important technological parameters in machining process. Cutting forces are the background for the evaluation of the necessary machining power, as well as for dimensioning of the tools. Cutting forces are also having a major influence on the deformation of the work piece machined, its dimensional accuracy, and machining system stability.

  19. Cutting Forces and Chip Morphology during Wood Plastic Composites Orthogonal Cutting

    Directory of Open Access Journals (Sweden)

    Xiaolei Guo

    2014-02-01

    Full Text Available The effect of chip thickness, rake angle, and edge radius on cutting forces and chip morphology in wood plastic composites (WPCs orthogonal cutting was investigated. Three types of WPCs, Wood flour/polyethylene composite (WFPEC, wood flour/polypropylene composite (WFPPC, and wood flour/polyvinyl chloride composite (WFPVCC, that were tested exhibited different behavior with respect to the machinability aspects. The cutting forces of WFPVCC were the highest, followed by WFPPC and WFPEC. The most significant factor on the parallel cutting force of these three types of WPCs was the chip thickness, which explained more than 90%, contribution of total variation, while rake angle, edge radius, and the interactions between these factors had small contributions. The most significant factor on the normal cutting force of WPCs was also the chip thickness, which accounted for more than 60% of the total variation. The chips produced included long continuous chips, short continuous chips, flake chips, and granule chips when cutting these three types of WPCs.

  20. Laser cutting of rectangular geometry into aluminum alloy: Effect of cut sizes on thermal stress field

    Science.gov (United States)

    Akhtar, Sohail; Kardas, Omer Ozgur; Keles, Omer; Yilbas, Bekir Sami

    2014-10-01

    Laser cutting of a rectangular geometry into aluminum alloy 2024 is carried out. Temperature and stress fields are predicted in the cutting section using the ABAQUS finite element code in line with the experimental conditions. Effect of the size of the rectangular geometry on the thermal stress fields is examined in the cutting section. Temperature predictions are validated through the thermocouple data. To identify the morphological changes in the cutting section, an experiment is carried out and the resulting cutting sections are examined under optical and scanning electron microscopes. It is found that temperature and stress fields are affected by the size of the rectangular cut geometry. Temperature and von Mises stress attains higher values for small size rectangular geometry as compared to its counterpart corresponding to the large size geometry. Laser cut sections are free from large size asperities including sideways burning and out-off flatness at the cut edges. Locally scattered some small dross attachments are observed at the kerf exit.

  1. The edges of graphene.

    Science.gov (United States)

    Zhang, Xiuyun; Xin, John; Ding, Feng

    2013-04-01

    The edge of two dimensional (2D) graphene, as the surface of a three dimensional (3D) crystal, plays a crucial role in the determination of its physical, electronic and chemical properties and thus has been extensively studied recently. In this review, we summarize the recent advances in the study of graphene edges, including edge formation energy, edge reconstruction, method of graphene edge synthesis and the recent progress on metal-passivated graphene edges and the role of edges in graphene CVD growth. We expect this review to provide a guideline for readers to gain a clear picture of graphene edges from several aspects, especially the catalyst-passivated graphene edges and their role in graphene CVD growth.

  2. Application Effect of Tender Branch Cutting Technology of Juglans Linn in Bijie City%核桃属树木嫩枝扦插技术在毕节市的应用效果研究

    Institute of Scientific and Technical Information of China (English)

    罗永猛; 李永荷; 杨先义; 余刚国

    2015-01-01

    Through introducing the tender branch cutting technology of Juglans Linn which developed by Forestry Research Institute of Chinese Academy of Forestry Sciences,by dopting the moisturize and calescence measures of intelligent greenhouse,the tender branches cutting of good Juglans Linn tender branches individual selected in recent years were propagated.The survival rate was promoted from 11.3% to 84.0%,so the technology showed significance in keeping good characters of Juglans Linn and forming good clonal varieties in Bijie City.%通过引进中国林业科学研究:林业研究所研究成功的“核桃属树木嫩枝扦插繁殖方法”,使用智能温棚等增温保湿措施,对毕节市近年鉴选出的核桃优良单株进行嫩枝扦插扩繁,使扦插成活率由11.3%提高至84.0%,对保持毕节市优良核桃品种的优良性状、形成一批优良无性系品种具有重要意义。

  3. Analysis of Orthogonal Cutting of Aluminium-based Composites

    Directory of Open Access Journals (Sweden)

    P. Ravinder Reddy

    2002-10-01

    Full Text Available A turning test on aluminium-based metal-matrix composites (MMCs (aluminium-30% silicon carbide was performed with K-20 carbide tool material and wear patterns and the wear land growth rates were analysed to evaluate the wear characteristics and to classify the relationship between the physical (mechanical properties and the flank wear of cutting tools. The study was also extended to the machining aspects and the width of cuts on MMCs and the influence of various cutting parameters. The experiments were conducted to measure the temperature along the cutting tool edge using thermocouple at various cutting speeds, and depth of cuts, keeping the feed rate constant while turning with K-20 carbide cutting tool. The finite-element method was used to simulate the orthogonal cutting of aluminium-based MMCs. The heat generation at the chip-tool interface, frictional heat generation at the tool flank, and the heat generation at the work tool interface were calculated analytically and imposed as boundary conditions. The analysis of the steady-state heat transfer was carried out and the temperature distribution at cutting edge, shear zone, and interface regions have been reported.

  4. Laser cutting - from 200 Watt to 12 Kilowatt

    DEFF Research Database (Denmark)

    Olsen, Flemming Ove; Nielsen, Jakob Skov

    2004-01-01

    Laser cutting is the most widespread industrial application of high power lasers. The development of this process was initiated around 1970, when scientists at TWI first demonstrated laser cutting with coaxial gas assistance. 10 years later, the polarisation problem was solved and the technology...... got its breakthrough. Since then some 30,000 laser cutting systems have been installed worldwide, making the laser an important cutting tool in modern industry....

  5. Laser cutting - from 200 Watt to 12 Kilowatt

    DEFF Research Database (Denmark)

    Olsen, Flemming Ove; Nielsen, Jakob Skov

    2004-01-01

    Laser cutting is the most widespread industrial application of high power lasers. The development of this process was initiated around 1970, when scientists at TWI first demonstrated laser cutting with coaxial gas assistance. 10 years later, the polarisation problem was solved and the technology...... got its breakthrough. Since then some 30,000 laser cutting systems have been installed worldwide, making the laser an important cutting tool in modern industry....

  6. Application of preservation technologies in fresh-cut fruits and vegetables%应用于鲜切果蔬中的保鲜技术研究进展

    Institute of Scientific and Technical Information of China (English)

    纪懿芳; 胡文忠; 姜爱丽

    2015-01-01

    Fresh-cut fruits and vegetables are increasingly favored by consumers, their sales increased by their convenience, rich nutrition and great freshness characteristics. Fresh-cut fruits and vegetables are also known as cut fruits and vegetables, semi processed fruits and vegetables, fruits and vegetables such as conditioning, usually refer to change vegetables, fruit, and physical shape, but still continue in its state of fresh fruit products or produce mixed products. The production process generally goes through cleaning, grading, trimming, segmentation, washing, drying, packaging, storage and distribution, available to consumers directly edible or by restaurants cooking. Preservation technologies in fresh-cut fruits and vegetables significantly affect sensory aspects such as color, smell, texture, flavor, and tissue. This paper summarized the preservation technologies of fresh-cut fruits and vegetables, such as physical, chemical, biological and combinatorial preservation technologies for fresh-cut fruits and vegetables, which would provide the further understanding of current problems and guidance of future research directions, and prospect for future developments presented.%鲜切果蔬因其方便、健康、新鲜等特点日益受到人们的青睐,销售量逐年增加。鲜切果蔬又称为切割果蔬、半加工果蔬、调理果蔬等,通常是指改变了蔬菜、水果物理形状、但仍然保持其新鲜状态的果蔬制品或果蔬混合产品。其生产过程一般要经过清洗、分级、修整、切分、洗涤、干燥、包装、贮存、配送等工序,可供消费者直接食用或餐饮业使用。鲜切果蔬保鲜技术对果蔬的色泽、气味、质地、营养成分、组织状态等感官方面得以最大的保留,减少果蔬因经过清洗、去皮、等机械处理过程导致的品质改变。本论文主要对现阶段鲜切果蔬的保鲜技术研究进展进行综述,其主要技术包括物理、化学和综

  7. A model for managing edge effects in harvest scheduling using spatial optimization

    Science.gov (United States)

    Kai L. Ross; Sándor F. Tóth

    2016-01-01

    Actively managed forest stands can create new forest edges. If left unchecked over time and across space, forest operations such as clear-cuts can create complex networks of forest edges. Newly created edges alter the landscape and can affect many environmental factors. These altered environmental factors have a variety of impacts on forest growth and structure and can...

  8. Inaugural Technology Transfer Showcase Aims to Increase Industry Partnerships and Commercialization of Cancer-Related Inventions | Poster

    Science.gov (United States)

    Science and business professionals from across the region will have an opportunity to learn about—and perhaps even commercialize—cutting-edge technologies being used to address some of the most urgent and intractable problems in the biomedical sciences at an upcoming event held at the Frederick National Laboratory for Cancer Research.

  9. Application of the mechanical cutting technology for coiled tubing in Yong 25-11 well%连续油管机械切割技术在永25-11井的应用

    Institute of Scientific and Technical Information of China (English)

    刘海明; 叶红; 田明; 吴国洲; 肖宝军

    2014-01-01

    The methods,such as back-off on neutral point and explosive cutting,are commonly used to deal withФ73 mm stuck tubing inФ139.7 mm casing.The back-off technique has disadvantages of low efficiency,high labor intensity, and high workover cost.The explosive cutting,being easily affected by downhole deviation,and the dirt and scale adhere to tubing inwall,and the cutter tool can not run into the predetermined position,the effective cutting can not be implemented. To solve the problems,it was carried out the improvement of cutting technology of general mechanical internal cutter.By applying coiled tubing to transmit general machinery cutter tools,using hydraulic motor as power tools,the stuck tubing was successfully cut in Yong25-11 well,which can provide a new way for processing the stuck tubing.%处理139.7 mm套管内遇卡Ф73 mm油管的常用方法有中和点倒扣法和爆炸切割法,倒扣解卡方式效率低、劳动强度大、修井费用高;而爆炸切割法易受到井斜及油管内壁脏物、油污影响,切割弹往往下不到预定位置,无法实现有效切割。为解决现有工艺问题,对普通机械内割刀切割技术进行研究,改进传统机械内割刀切割技术,应用连续油管传输普通机械内割刀工具,采用液压马达作为动力工具,现场应用,成功切割永25-11井遇卡油管,为处理遇卡油管积累经验,提供新思路。

  10. Edge detection in microscopy images using curvelets

    Directory of Open Access Journals (Sweden)

    Koumoutsakos Petros

    2009-03-01

    Full Text Available Abstract Background Despite significant progress in imaging technologies, the efficient detection of edges and elongated features in images of intracellular and multicellular structures acquired using light or electron microscopy is a challenging and time consuming task in many laboratories. Results We present a novel method, based on the discrete curvelet transform, to extract a directional field from the image that indicates the location and direction of the edges. This directional field is then processed using the non-maximal suppression and thresholding steps of the Canny algorithm to trace along the edges and mark them. Optionally, the edges may then be extended along the directions given by the curvelets to provide a more connected edge map. We compare our scheme to the Canny edge detector and an edge detector based on Gabor filters, and show that our scheme performs better in detecting larger, elongated structures possibly composed of several step or ridge edges. Conclusion The proposed curvelet based edge detection is a novel and competitive approach for imaging problems. We expect that the methodology and the accompanying software will facilitate and improve edge detection in images available using light or electron microscopy.

  11. Graphs of Plural Cuts

    CERN Document Server

    Dosen, K

    2011-01-01

    Plural (or multiple-conclusion) cuts are inferences made by applying a structural rule introduced by Gentzen for his sequent formulation of classical logic. As singular (single-conclusion) cuts yield trees, which underlie ordinary natural deduction derivations, so plural cuts yield graphs of a more complicated kind, related to trees, which this paper defines. Besides the inductive definition of these oriented graphs, which is based on sequent systems, a non-inductive, graph-theoretical, combinatorial, definition is given, and to reach that other definition is the main goal of the paper. As trees underlie multicategories, so the graphs of plural cuts underlie polycategories. The graphs of plural cuts are interesting in particular when the plural cuts are appropriate for sequent systems without the structural rule of permutation, and the main body of the paper deals with that matter. It gives a combinatorial characterization of the planarity of the graphs involved.

  12. Laser cutting plastic materials

    Energy Technology Data Exchange (ETDEWEB)

    Van Cleave, R.A.

    1980-08-01

    A 1000-watt CO/sub 2/ laser has been demonstrated as a reliable production machine tool for cutting of plastics, high strength reinforced composites, and other nonmetals. More than 40 different plastics have been laser cut, and the results are tabulated. Applications for laser cutting described include fiberglass-reinforced laminates, Kevlar/epoxy composites, fiberglass-reinforced phenolics, nylon/epoxy laminates, ceramics, and disposable tooling made from acrylic.

  13. Cutting characteristics of dental diamond burs made with CVD technology Características de corte de pontas odontológicas diamantadas obtidas pela tecnologia CVD

    Directory of Open Access Journals (Sweden)

    Luciana Monti Lima

    2006-04-01

    Full Text Available The aim of this study was to determine the cutting ability of chemical vapor deposition (CVD diamond burs coupled to an ultrasonic dental unit handpiece for minimally invasive cavity preparation. One standard cavity was prepared on the mesial and distal surfaces of 40 extracted human third molars either with cylindrical or with spherical CVD burs. The cutting ability was compared regarding type of substrate (enamel and dentin and direction of handpiece motion. The morphological characteristics, width and depth of the cavities were analyzed and measured using scanning electron micrographs. Statistical analysis using the Kruskal-Wallis test (p O objetivo deste estudo foi determinar a habilidade de corte das pontas de diamante obtidas pelo processo de deposição química a vapor (CVD associadas ao aparelho de ultra-som no preparo cavitário minimamente invasivo. Uma cavidade padronizada foi preparada nas faces mesial e distal de 40 terceiros molares, utilizando-se pontas de diamante CVD cilíndrica e esférica. A habilidade de corte foi comparada quanto ao tipo de substrato (esmalte e dentina e quanto à direção do movimento realizado com a ponta. As características morfológicas, a largura e profundidade das cavidades foram analisadas e medidas em microscopia eletrônica de varredura. A análise estatística pelo teste de Kruskal-Wallis (p < 0,05 revelou que a largura e profundidade das cavidades foram significativamente maiores em dentina. Cavidades mais largas foram obtidas quando se utilizou a ponta de diamante CVD cilíndrica, e mais profundas quando a ponta esférica foi empregada. A direção do movimento da ponta não influenciou o tamanho das cavidades, sendo os cortes produzidos pelas pontas de diamante CVD precisos e conservadores.

  14. Stability of edge states and edge magnetism in graphene nanoribbons

    OpenAIRE

    Kunstmann, Jens; Özdoğan, Cem; Quandt, Alexander; Fehske, Holger

    2010-01-01

    We critically discuss the stability of edge states and edge magnetism in zigzag edge graphene nanoribbons (ZGNRs). We point out that magnetic edge states might not exist in real systems, and show that there are at least three very natural mechanisms - edge reconstruction, edge passivation, and edge closure - which dramatically reduce the effect of edge states in ZGNRs or even totally eliminate them. Even if systems with magnetic edge states could be made, the intrinsic magnetism would not be ...

  15. Ultrasonic Cutting of Foods

    Science.gov (United States)

    Schneider, Yvonne; Zahn, Susann; Rohm, Harald

    In the field of food engineering, cutting is usually classified as a mechanical unit operation dealing with size reduction by applying external forces on a bulk product. Ultrasonic cutting is realized by superpositioning the macroscopic feed motion of the cutting device or of the product with a microscopic vibration of the cutting tool. The excited tool interacts with the product and generates a number of effects. Primary energy concentration in the separation zone and the modification of contact friction along the tool flanks arise from the cyclic loading and are responsible for benefits such as reduced cutting force, smooth cut surface, and reduced product deformation. Secondary effects such as absorption and cavitation originate from the propagation of the sound field in the product and are closely related to chemical and physical properties of the material to be cut. This chapter analyzes interactions between food products and ultrasonic cutting tools and relates these interactions with physical and chemical product properties as well as with processing parameters like cutting velocity, ultrasonic amplitude and frequency, and tool design.

  16. FY2015 Electric Drive Technologies Annual Progress Report

    Energy Technology Data Exchange (ETDEWEB)

    None, None

    2016-02-29

    The Electric Drive Technologies research and development (R&D) subprogram within the DOE Vehicle Technologies Office (VTO) provides support and guidance for many cutting-edge automotive technologies under development. Research is focused on developing power electronics (PE), electric motor, and traction drive system (TDS) technologies that will reduce system cost and improve their efficiency in transforming battery energy to useful work. The R&D is also aimed at better understanding and improving how various components of tomorrow’s automobiles will function as a unified system to improve fuel efficiency.

  17. FY2014 Electric Drive Technologies Annual Progress Report

    Energy Technology Data Exchange (ETDEWEB)

    None

    2014-12-01

    The Electric Drive Technologies research and development (R&D) subprogram within the DOE Vehicle Technologies Office (VTO) provides support and guidance for many cutting-edge automotive technologies under development. Research is focused on developing power electronics (PE), electric motor, and traction drive system (TDS) technologies that will reduce system cost and improve their efficiency in transforming battery energy to useful work. The R&D is also aimed at better understanding and improving how various components of tomorrow’s automobiles will function as a unified system to improve fuel efficiency.

  18. Nanoimprint technology nanotransfer for thermoplastic and photocurable polymers

    CERN Document Server

    Taniguchi, Jun; Mizuno, Jun; Saito, Takushi

    2013-01-01

    Nanoscale pattern transfer technology using molds is a rapidly advancing area and one that has seen much recent attention due to its potential for use in nanotechnology industries and applications. However, because of these rapid advances, it can be difficult to keep up with the technological trends and the latest cutting-edge methods. In order to fully understand these pioneering technologies, a comprehensive understanding of the basic science and an overview of the techniques are required. Nanoimprint Technology: Nanotransfer for Thermoplastic and Photocurable Polymers covers

  19. 基于非负矩阵分解的切削加工工艺参数选择%Selection of Technological Parameters of Cutting Process Based on Non-negative Matrix Factorization

    Institute of Scientific and Technical Information of China (English)

    贾伟

    2016-01-01

    数控机床的切削加工工艺参数选择对零件加工有着重要影响,针对现有工艺参数选择方法的不足之处,提出了一种基于非负矩阵分解的工艺参数选择方法,在矩阵分解中使用贝叶斯准则和Gibbs采样计算后验概率分布,实例分析表明该方法能克服现有方法的不足,实现了对工艺参数的优化选择。%The selection of technological parameters of cutting process in numerical control machine has important influence on the components processing. Some faults of the existing methods of selection of technological parameters are pointed out. A method of selection of technological parameters based on non-negative matrix factorization is proposed. The method calcul-ates the posterior probability distribution by using Bayesian criteria and Gibbs sampling. An example shows that the new meth-od can overcome the shortcomings of the existing methods and realize the optimization of technological parameters.

  20. 广东地区铁皮石斛茎段扦插繁殖技术研究初报%Compound Cutting Propagation Technology of Dendrobium officinale in Guangdong Area

    Institute of Scientific and Technical Information of China (English)

    赵贵林; 郑平; 卢运明; 陈肖英; 钟妙娥; 金英子; 赵杨敏

    2013-01-01

    为解决铁皮石斛常规扦插繁殖存在的整齐度差、成苗量偏少的生产问题,本单位自2009年起开展铁皮石斛药剂浸泡结合暗处理的复合技术研究。通过几年的努力,总结出适合广东地区生产应用的复合扦插繁殖技术;铁皮石斛茎段萌芽率由原来的20%~30%提高到60%以上,基本解决了常规扦插繁殖存在的问题;短期内批量生产出生长整齐、适合生产栽种的优质种苗。表明该技术具有良好的应用前景。%In order to solve production problem on the conventional cutting propagation of Dendrobium offic inale existing uniformity difference and less seedling amount, since 2009 research work on reagent immersion combined with dark treatment in Dendrobium officinale was launched out. Through effort of a few years, summed up the compound cutting propagation technique for production of composite application in Guangdong area, Dendrobium officinale stem sprout rate increases from 20%~30% to more than 60%, basically solved the problems of conventional cutting propagation, the short term production was born long neat, suitable for the production of high quality seedling planting. The technology has a good application prospect.

  1. Study on Electrical Discharge Machining Technology of Polycrystalline Cubic Boron Nitride Cutting Tool%聚晶立方氮化硼刀具刃口放电加工工艺研究

    Institute of Scientific and Technical Information of China (English)

    贾云海; 李建钢; 朱立新; 宋英杰

    2012-01-01

    通过调整电火花加工的主要放电参数(脉冲宽度和加工电流),对聚晶立方氮化硼(PCBN)样刀进行放电加工,进而对样刀刃口表面进行X射线衍射分析,并在扫描电子显微镜下观察其表层结构及能谱分析.通过对加工后样刀表面变质层主要成分及产生原因的分析,总结了脉冲宽度和加工电流对样刀表面变质层厚度、刃口表面粗糙度影响的关系曲线,为制定精密快速放电加工PCBN刀具的工艺提供了重要依据.%The samples of polycrystalline cubic boron nitride(PCBN) cutting tool were machined by adjusting the main parameters of electrical discharge machining (EDM). After the machining, the phases were analyzed by X-ray diffraction analyzer and the surface layer microstructure was observed by scanning electronic microscope. The fundamental component of machined PCBN cutting tool affected layer was obtained and the reason of begetting affected layer was analyzed. The relationship curves between pulse width, working electric current and depth affected layer, blade surface roughness were summarized. The results showed that to adjust electrical discharge machining parameters, such as decreasing pulse width or machining electric currents, can reduce the depth of affect layer and improve blade surface roughness. These researches provide valuable test reference for drawing up electrical discharge machining technology of PCBN cutting tool.

  2. Large cutting tools in the Danjiangkou Reservoir Region, central China.

    Science.gov (United States)

    Kuman, Kathleen; Li, Chaorong; Li, Hao

    2014-11-01

    Handaxe-bearing sites in China are currently known to occur in a number of alluvial basins, the best known being Dingcun, Bose and Luonan. Bose in the south and Luonan in central China on the northern margin of the Qinling Mountains are most familiar to English-speaking researchers. Here we document the Danjiangkou Reservoir Region (DRR) as another major area for large cutting tools (LCTs), located in central China on the southeastern edge of the Qinling Mountains. Large cutting tools are preserved in three terraces of the Han and Dan Rivers in Hubei and Henan Provinces, with dates from ca. 0.8 Ma (millions of years ago) (Terrace 4) to the first half of the Middle Pleistocene (Terrace 3), and possibly to the Late Pleistocene (Terrace 2). This paper reports on LCTs discovered in Terraces 3 and 2, with a majority from the older terrace (and one specimen from Terrace 4). Regional environments during the Middle Pleistocene were relatively warm, humid and stable. Despite the poor quality of raw materials (predominantly quartz phyllite and trachyte for the LCTs), good examples of both handaxes and cleavers are present, plus two types of picks. The LCT technology is compared and contrasted with other Asian industries and with the Acheulean. Overall the DRR LCTs show both technological and morphological similarities with Acheulean LCTs, with some differences that are mainly attributed to raw material properties, subsistence ecology, and 'cultural drift.' The DRR LCTs expand the range of morphological variability of the East Asian material and highlight the need for greater reliance on technological analysis and raw material evaluation for best comparison of Chinese assemblages with the Acheulean tradition.

  3. Researches on evaluation of smooth entrance in cutting using electrical current. A case study

    Directory of Open Access Journals (Sweden)

    Diţu Valentin

    2017-01-01

    Full Text Available At metal drilling, at the beginning of the process, the cutting tool in the chisel edge zone, frictions and plastically deforms the material, and then enters in cutting. If the drill is entered smoothly in cutting with a special device, its life is increased. The paper presents how the electrical current at cutting is used for the evaluation of smooth entrance in cutting in comparison with classical cutting. These are demonstrated for 41MoC11 steel drilled with a set of 30 tools having 8 mm diameter.

  4. Researches on evaluation of smooth entrance in cutting using electrical current. A case study

    OpenAIRE

    Diţu Valentin; Oancea Gheorghe; Daicu Raluca

    2017-01-01

    At metal drilling, at the beginning of the process, the cutting tool in the chisel edge zone, frictions and plastically deforms the material, and then enters in cutting. If the drill is entered smoothly in cutting with a special device, its life is increased. The paper presents how the electrical current at cutting is used for the evaluation of smooth entrance in cutting in comparison with classical cutting. These are demonstrated for 41MoC11 steel drilled with a set of 30 tools having 8 mm d...

  5. Automotive crankshaft" axis linkage cut point tracking" servo grinding and its key technology%汽车曲轴的"三轴联动切点跟踪"随动磨床及其关键技术研究

    Institute of Scientific and Technical Information of China (English)

    黄兴红; 潘旭华; 吴兴; 黄文广

    2011-01-01

    在分析两轴联动切点跟踪曲轴随动磨削方法的技术缺陷基础上,系统地介绍了"三轴联动切点跟踪"磨削原理,给出了"三轴联动切点跟踪"曲轴随动磨削运动模型,概括了该原理在曲轴连杆颈和主轴颈磨削中的技术优势.并且通过高精度液体静压导轨、高刚性直线驱动技术和在线测量与误差补偿等关键技术的综合运用,成功地解决了超精密磨削加工中各运动部件动态性能及其对加工精度的影响,攻克了用普通刚玉砂轮高效率、高精度磨削曲轴主轴颈和连杆颈的技术难题.%Based on the analysis of two-axis servo cut point trackina crankshaft grinding method on the basis of technical defects, systematic introduction to the "axis linkage cut point tracking" grinding principle,gives the "cut point tracking axis linkage" with the crankshaft activity grinding motion model, summarizes the principles of the neck and the connecting rod in the crankshaft main journal grinding technology advantage. And by high-precision hydrostatic guideway, high rigidity straight line drive technology and online measurement and error compensation of the integrated use of key technologies, successfully resolves the ultra-precision grinding dynamic performance of the various moving parts and its impact on the machining accuracy, to capture a corundum wheel with ordinary high-effieiency, high precision grinding of the crankshaft main journal and connecting rod neck of technical problems.

  6. Saving Seal Cutting

    Institute of Scientific and Technical Information of China (English)

    2009-01-01

    On April 20, the graduation ceremony of China’s seal-cutting art postgraduates and visiting experts from the Institute of Seal Cutting Art under the China Art Academy was held in Beijing. On the same day, the exhibition of the works of the teachers and graduates of the institute was also held.

  7. Cutting Class Harms Grades

    Science.gov (United States)

    Taylor, Lewis A., III

    2012-01-01

    An accessible business school population of undergraduate students was investigated in three independent, but related studies to determine effects on grades due to cutting class and failing to take advantage of optional reviews and study quizzes. It was hypothesized that cutting classes harms exam scores, attending preexam reviews helps exam…

  8. Fundamentals of cutting.

    Science.gov (United States)

    Williams, J G; Patel, Y

    2016-06-06

    The process of cutting is analysed in fracture mechanics terms with a view to quantifying the various parameters involved. The model used is that of orthogonal cutting with a wedge removing a layer of material or chip. The behaviour of the chip is governed by its thickness and for large radii of curvature the chip is elastic and smooth cutting occurs. For smaller thicknesses, there is a transition, first to plastic bending and then to plastic shear for small thicknesses and smooth chips are formed. The governing parameters are tool geometry, which is principally the wedge angle, and the material properties of elastic modulus, yield stress and fracture toughness. Friction can also be important. It is demonstrated that the cutting process may be quantified via these parameters, which could be useful in the study of cutting in biology.

  9. 国际教练员-运动员关系研究现状、热点和前沿的可视化分析%Visualization Analysis of Research Status、Research hotspot、cutting - edge Research of Coach - athlete Relationship

    Institute of Scientific and Technical Information of China (English)

    郭宇刚; 夏树花; 张忠秋

    2015-01-01

    以 Web of ScienceTM数据库中的文献为来源,以1991-2013年国际教练员-运动员关系领域的442篇文献为分析对象,借助 HistCite 软件进行文献的可视化分析,从年代分布,研究重要地区、机构和学者,研究的历程,研究的热点和前沿文献进行分析,结果表明:国际教练员动员关系的研究呈逐年上升的趋势,形成了以英国和美国为代表国家,Jowett S 、Amorose AJ、Vallerand R 、Duda JL等11名高影响力学者;国际教练员-运动员关系历程主要有三个阶段;研究的热点主要集中在执教、动机、知觉、模型、领导、内在动机、问卷、团队、凝聚力、成对、移情、准确性、成绩、精英和职业倦怠方面研究的前沿主要集中在教练员-运动员关系的跨文化研究、教练员-运动员关系的多样化研究等6方面的研究。%Using the software of HistCite and RefViz ,442 papers from 1991 to 2013 in Web of Science Datebase were analyzed with the citation analysis visualization for international coach - athlete relationship. The results indicate that the International Coach - athlete relationship study shows an increasing trend with the United King-dom and the United States as the eight representative countries and Jowett S,Amorose AJ,Vallerand R,Duda JL and so on as the eleven influential scholars. The international coach - athlete relationship research can be di-vided into three phases with the research hotspot mainly focusing on motivation,perception,model,leadership and intrinsic motivation,questionnaire,team cohesion,dyads,empathy,accuracy,performance,elite and burnout,and cutting - edge research focusing on cross - cultural studies,diversification study,etc.

  10. The inspiration of comprehensive quality related cutting-edge curriculum of the University of California,Los Angeles School of Dentistry%加州大学洛杉矶分校牙学院综合素质相关前沿课程启示

    Institute of Scientific and Technical Information of China (English)

    商思霞; 孙惠强; 邓艳南; 邵琦

    2011-01-01

    本文主要对美国加州大学洛杉矶分校牙学院(以下简称UCLA)开设的综合素质相关课程中的、及3门课程作相关介绍,深入探讨3门课程的内涵及对学生综合素质培养的重要作用,为我国口腔医学教育改革中对学生综合素质的培养提供借鉴和参考.在课程设置种类、课时数及开设时机等方面,比较了山东大学口腔医学院与UCLA的综合素质培养相关课程设置,发现山东大学口腔医学院开设的综合素质课程涵盖内容较少、课时数不足并且开设的时机较晚.建议国内口腔医学院校逐渐开设此3门综合素质相关前沿课程,并将其与临床实践相结合.%In this article, the author introduced three course of comprehensive quality training set up in the University of California, Los Angeles School of Dentistry (UCLA), named "introduction to behavioral science", "patient management","methods in evidence-based dentistry". In order to provide reference for our medical reform of dental students, the content of the three courses were provided and the importance of comprehensive quality training was evaluated. The curriculum type, number of hours and time to deliver were compared between UCLA and School of Stomatology, Shandong University.It was found that the comprehensive quality training-related curriculum, offered in Shandong University covered fewer content, fewer number of hours and delivered later. Therefore, the author suggests the domestic dental institutions set up the three cutting-edge courses integrated with clinical practice as well. Supported by Teaching Reform Project of Shandong University(2009174).

  11. Research on High Pressure Abrasive Water Jet Nozzle,an Offshore Clean Cutting Core Technology%海上清洁切割核心技术--高压磨料射流切割喷嘴研究

    Institute of Scientific and Technical Information of China (English)

    马认琦; 鞠少栋; 王超

    2016-01-01

    In order to realize the safety and high efficiency of cutting and recovery operations for abandoned offshore pro-duction facilities to guarantee the implementation of Maritime Silk Road Strategy and the expansion of CNOOC’s offshore clean and environmental friendly cutting technical services, a high pressure abrasive water jet cutting nozzle was designed and optimized through theoretical research and experimental tests, which can be used for available abrasive water jet tech-nology. Its key techniques include abrasive acceleration in the nozzle, optimization of nozzle structure, design of inner flow path, material and sintering process selection. The nanometer anti-abrasive nozzles were developed and field cutting opera-tions have been completed. This achievement has improved the operating efficiency and service level for abandoned CNOOC offshore production facilities.%为实现海上废弃结构物的安全高效切割回收,保障海上丝绸之路战略构想的顺利实施,同时做大做强中海油海上清洁环保切割技术服务产业,针对公司现有的磨料射流切割技术,通过理论研究与试验测试的方法,设计并自主研制高压磨料射流切割喷嘴,重点解决了喷嘴内部磨料加速受力研究、喷嘴结构型式优选及内部流道设计、喷嘴选材及烧结工艺优选等关键技术。最终,研发出高性能纳米级耐磨喷嘴并成功完成了现场切割应用,该成果显著提高了中海油海上结构物弃置作业效率和整体技术服务水平。

  12. Influence of cutting parameters on surface characteristics of cut section in cutting of Inconel 718 sheet using CW Nd:YAG laser

    Institute of Scientific and Technical Information of China (English)

    Dong-Gyu AHN; Kyung-Won BYUN

    2009-01-01

    Recently, laser cutting technologies begin to use for manufacturing mechanical parts of lnconel super-alloy sheet due to difficulties of machining of the Inconel material as a results of its extremely tough nature. The objective of this work is to investigate the influence of cutting parameters on surface characteristics of the cut section in the cutting of Inconel 718 super-alloy sheet using CW Nd:YAG laser through laser cutting experiments. Normal cutting experiments were performed using a laser cutting system with six-axis controlled automatic robot and auto-tracking system of the focal distance. From the results of the experiments, the effects of the cutting parameters on the surface roughness, the striation formation and the microstructure of the cut section were examined. In addition, an optimal cutting condition, at which the surface roughness is minimized and both the delayed cutting phenomenon and the micro-cracking are not initiated, is estimated to improve both the part quality and the cutting efficiency.

  13. Applied Research on High-Pressure Water Jet Cutting Technology in Anti-Terrorist%高压水射流切割技术在反恐中的应用研究

    Institute of Scientific and Technical Information of China (English)

    孙义柯; 龚烈航; 罗晓凯

    2015-01-01

    In this article, the main principle of high-pressure water jet cutting technology is described with focusing on appli-cation of the high-pressure abrasive water jet in counter-terrorism operations. A pre-mixed abrasive high pressure water jet device that is applicative in the counter-terrorism operations is researched and designed so as to provide a kind of protection for the counter-terrorism operations.%介绍了高压水射流切割技术的主要原理,重点介绍了磨料高压水射流在反恐行动中的应用,并研究设计了一种在反恐行动中适用的前混合磨料高压水射流装置,为反恐行动的顺利进行提供一种行动上的保障.

  14. Controllable Edge Feature Sharpening for Dental Applications

    Directory of Open Access Journals (Sweden)

    Ran Fan

    2014-01-01

    Full Text Available This paper presents a new approach to sharpen blurred edge features in scanned tooth preparation surfaces generated by structured-light scanners. It aims to efficiently enhance the edge features so that the embedded feature lines can be easily identified in dental CAD systems, and to avoid unnatural oversharpening geometry. We first separate the feature regions using graph-cut segmentation, which does not require a user-defined threshold. Then, we filter the face normal vectors to propagate the geometry from the smooth region to the feature region. In order to control the degree of the sharpness, we propose a feature distance measure which is based on normal tensor voting. Finally, the vertex positions are updated according to the modified face normal vectors. We have applied the approach to scanned tooth preparation models. The results show that the blurred edge features are enhanced without unnatural oversharpening geometry.

  15. Laser cutting of rectangular geometry in 2024 aluminum alloy: Thermal stress analysis

    Science.gov (United States)

    Kardas, Omer Ozgur; Keles, Omer; Akhtar, Sohail; Yilbas, Bekir Sami

    2014-12-01

    Laser cutting of rectangular geometry in 2024 aluminum sheet is carried out under high pressure nitrogen assisting gas. Temperature and thermal stress fields are predicted in the cutting region incorporating ABAQUS finite element code. Morphological and elemental changes in the cutting section are analyzed using optical and scanning electron microscopes, and energy dispersive spectroscopy. Surface temperature rise in the vicinity of the cut edges is measured incorporating the thermocouples and the findings are compared with their counterparts obtained from the simulations for the validation purposes. It is found that temperature predictions agree well with the thermocouple data. von Mises stress attains significantly high values in the close region of the corners of the cut edges and mid-thickness of the cutting section along the rectangular geometry. The laser cutting section is free from large asperities such as cracks and sideways burnings; however, local dross attachment is observed at the kerf exit.

  16. Development of narrow gap welding technology for extremely thick steel

    Science.gov (United States)

    Imai, K.; Saito, T.; Okumura, M.

    In the field of extremely thick steel, various narrow gap welding methods were developed on the basis of former welding methods and are used in practice. It is important to develop and improve automatic narrow gap welding, J edge preparation by gas cutting, the prevention of welding defects, wires for narrow gap welding and so on in order to expand the scope of application of the method. Narrow gap welding technologies are described, based on new concepts developed by Nippon Steel Corporation.

  17. Close to Kill: Vestigial Technologies and Combat Arms

    Science.gov (United States)

    2012-06-01

    impediments to the ram. With advancements in sailing technology, modern sailing vessels depended on lengthy pole -like extensions that stuck out well...waters. At home, the South was able to produce a series of ram-equipped vessels that would galvanize a close-to-kill mentality. The ram’s...Fortunately for them, the knife- like edges of their steel vessels often cut easily into their prey. While ramming may appear to have been

  18. Online Cake Cutting

    CERN Document Server

    Walsh, Toby

    2010-01-01

    We propose an online form of the cake cutting problem. This models situations where players arrive and depart during the process of dividing a resource. We show that well known fair division procedures like cut-and-choose and the Dubins-Spanier moving knife procedure can be adapted to apply to such online problems. We propose some desirable properties that online cake cutting procedures might possess like online forms of proportionality and envy-freeness, and identify which properties are in fact possessed by the different online cake procedures.

  19. Experimental testing of exchangeable cutting inserts cutting ability

    OpenAIRE

    Čep, Robert; Janásek, Adam; Čepová Lenka; Petrů, Jana; Ivo HLAVATÝ; Car, Zlatan; Hatala, Michal

    2013-01-01

    The article deals with experimental testing of the cutting ability of exchangeable cutting inserts. Eleven types of exchangeable cutting inserts from five different manufacturers were tested. The tested cutting inserts were of the same shape and were different especially in material and coating types. The main aim was both to select a suitable test for determination of the cutting ability of exchangeable cutting inserts and to design such testing procedure that could make it possible...

  20. Edge physics Simulations

    Institute of Scientific and Technical Information of China (English)

    X.Q. Xu; C.S. Chang

    2007-01-01

    @@ The plasma edge includes the pedestal, scrape-off, and divertor regions. A complete edge physics should deal with the plasma, atomic, and the plasma-wall interaction phenomena. The edge provides the source of plasma through ionization of the incoming neutral particles and source of impurity through the wall sputtering. Edge plasma sets a boundary condition for the core confinement physics. Importance of the edge plasma has been elevated to the top list of the ITER physics research needs due to the necessity of the self-organized plasma pedestal and its destruction by edge localized mode activities. Extrapolation of the present tokamak data base predicts that a sufficient pedestal height is a necessary condition for the success of ITER.

  1. Influence of cutting parameters on the depth of subsurface deformed layer in nano-cutting process of single crystal copper.

    Science.gov (United States)

    Wang, Quanlong; Bai, Qingshun; Chen, Jiaxuan; Su, Hao; Wang, Zhiguo; Xie, Wenkun

    2015-12-01

    Large-scale molecular dynamics simulation is performed to study the nano-cutting process of single crystal copper realized by single-point diamond cutting tool in this paper. The centro-symmetry parameter is adopted to characterize the subsurface deformed layers and the distribution and evolution of the subsurface defect structures. Three-dimensional visualization and measurement technology are used to measure the depth of the subsurface deformed layers. The influence of cutting speed, cutting depth, cutting direction, and crystallographic orientation on the depth of subsurface deformed layers is systematically investigated. The results show that a lot of defect structures are formed in the subsurface of workpiece during nano-cutting process, for instance, stair-rod dislocations, stacking fault tetrahedron, atomic clusters, vacancy defects, point defects. In the process of nano-cutting, the depth of subsurface deformed layers increases with the cutting distance at the beginning, then decreases at stable cutting process, and basically remains unchanged when the cutting distance reaches up to 24 nm. The depth of subsurface deformed layers decreases with the increase in cutting speed between 50 and 300 m/s. The depth of subsurface deformed layer increases with cutting depth, proportionally, and basically remains unchanged when the cutting depth reaches over 6 nm.

  2. An Indentation Method for Nanoprecision Measurement of Diamond Tool Edge Radius

    Institute of Scientific and Technical Information of China (English)

    X; P; Li; M; Rahman; K; Liu; K; S; Neo; C; C; Chan

    2002-01-01

    In ductile mode cutting of brittle materials using di amond tools, such as ductile cutting of silicon and quartz for wafer fabrication , one of the key conditions for achieving ductile chip formation is to get the r ight ratio of tool cutting edge radius to the undeformed chip thickness. It has been shown that the undeformed chip thickness has to be in the order of nanomete rs and that the tool cutting edge radius has to be smaller than the undeformed c hip thickness. Therefore, nanoprecision measurement ...

  3. Tasting edge effects

    CERN Document Server

    Bocquet, L

    2006-01-01

    We show that the baking of potato wedges constitutes a crunchy example of edge effects, which are usually demonstrated in electrostatics. A simple model of the diffusive transport of water vapor around the potato wedges shows that the water vapor flux diverges at the sharp edges in analogy with its electrostatic counterpart. This increased evaporation at the edges leads to the crispy taste of these parts of the potatoes.

  4. Tasting edge effects

    Science.gov (United States)

    Bocquet, Lydéric

    2007-02-01

    We show that the baking of potato wedges constitutes a crunchy example of edge effects, which are usually demonstrated in electrostatics. A simple model of the diffusive transport of water vapor around the potato wedges shows that the water vapor flux diverges at the sharp edges in analogy with its electrostatic counterpart. This increased evaporation at the edges leads to the crispy taste of these parts of the potatoes.

  5. Testing Of Choiced Ceramics Cutting Tools At Irregular Interrupted Cut

    Science.gov (United States)

    Kyncl, Ladislav; Malotová, Šárka; Nováček, Pavel; Nicielnik, Henryk; Šoková, Dagmar; Hemžský, Pavel; Pitela, David; Holubjak, Jozef

    2015-12-01

    This article discusses the test of removable ceramic cutting inserts during machining irregular interrupted cut. Tests were performed on a lathe, with the preparation which simulated us the interrupted cut. By changing the number of plates mounted in a preparation it simulate us a regular or irregular interrupted cut. When with four plates it was regular interrupted cut, the remaining three variants were already irregular cut. It was examined whether it will have the irregular interrupted cutting effect on the insert and possibly how it will change life of inserts during irregular interrupted cut (variable delay between shocks).

  6. The Index of Dirac Operators on Incomplete Edge Spaces

    Science.gov (United States)

    Albin, Pierre; Gell-Redman, Jesse

    2016-09-01

    We derive a formula for the index of a Dirac operator on a compact, even-dimensional incomplete edge space satisfying a ''geometric Witt condition''. We accomplish this by cutting off to a smooth manifold with boundary, applying the Atiyah-Patodi-Singer index theorem, and taking a limit. We deduce corollaries related to the existence of positive scalar curvature metrics on incomplete edge spaces.

  7. a Min-Cut Based Filter for Airborne LIDAR Data

    Science.gov (United States)

    Ural, Serkan; Shan, Jie

    2016-06-01

    LiDAR (Light Detection and Ranging) is a routinely employed technology as a 3-D data collection technique for topographic mapping. Conventional workflows for analyzing LiDAR data require the ground to be determined prior to extracting other features of interest. Filtering the terrain points is one of the fundamental processes to acquire higher-level information from unstructured LiDAR point data. There are many ground-filtering algorithms in literature, spanning several broad categories regarding their strategies. Most of the earlier algorithms examine only the local characteristics of the points or grids, such as the slope, and elevation discontinuities. Since considering only the local properties restricts the filtering performance due to the complexity of the terrain and the features, some recent methods utilize global properties of the terrain as well. This paper presents a new ground filtering method, Min-cut Based Filtering (MBF), which takes both local and global properties of the points into account. MBF considers ground filtering as a labeling task. First, an energy function is designed on a graph, where LiDAR points are considered as the nodes on the graph that are connected to each other as well as to two auxiliary nodes representing ground and off-ground labels. The graph is constructed such that the data costs are assigned to the edges connecting the points to the auxiliary nodes, and the smoothness costs to the edges between points. Data and smoothness terms of the energy function are formulated using point elevations and approximate ground information. The data term conducts the likelihood of the points being ground or off-ground while the smoothness term enforces spatial coherence between neighboring points. The energy function is optimized by finding the minimum-cut on the graph via the alpha-expansion algorithm. The resulting graph-cut provides the labeling of the point cloud as ground and off-ground points. Evaluation of the proposed method on

  8. Short-cut math

    CERN Document Server

    Kelly, Gerard W

    1984-01-01

    Clear, concise compendium of about 150 time-saving math short-cuts features faster, easier ways to add, subtract, multiply, and divide. Each problem includes an explanation of the method. No special math ability needed.

  9. Cutting Cakes Correctly

    CERN Document Server

    Hill, Theodore P

    2008-01-01

    Without additional hypotheses, Proposition 7.1 in Brams and Taylor's book "Fair Division" (Cambridge University Press, 1996) is false, as are several related Pareto-optimality theorems of Brams, Jones and Klamler in their 2006 cake-cutting paper.

  10. Edge detection in microscopy images using curvelets

    OpenAIRE

    Koumoutsakos Petros; Gebäck Tobias

    2009-01-01

    Abstract Background Despite significant progress in imaging technologies, the efficient detection of edges and elongated features in images of intracellular and multicellular structures acquired using light or electron microscopy is a challenging and time consuming task in many laboratories. Results We present a novel method, based on the discrete curvelet transform, to extract a directional field from the image that indicates the location and direction of the edges. This directional field is...

  11. Natural and artificial spectral edges in exoplanets

    Science.gov (United States)

    Lingam, Manasvi; Loeb, Abraham

    2017-09-01

    Technological civilizations may rely upon large-scale photovoltaic arrays to harness energy from their host star. Photovoltaic materials, such as silicon, possess distinctive spectral features, including an 'artificial edge' that is characteristically shifted in wavelength shortwards of the 'red edge' of vegetation. Future observations of reflected light from exoplanets would be able to detect both natural and artificial edges photometrically, if a significant fraction of the planet's surface is covered by vegetation or photovoltaic arrays, respectively. The stellar energy thus tapped can be utilized for terraforming activities by transferring heat and light from the day side to the night side on tidally locked exoplanets, thereby producing detectable artefacts.

  12. Laser cutting system

    Science.gov (United States)

    Dougherty, Thomas J

    2015-03-03

    A workpiece cutting apparatus includes a laser source, a first suction system, and a first finger configured to guide a workpiece as it moves past the laser source. The first finger includes a first end provided adjacent a point where a laser from the laser source cuts the workpiece, and the first end of the first finger includes an aperture in fluid communication with the first suction system.

  13. Why life sciences companies need to tap technology to gain a competitive edge-and what that means for the chief information officers (CIO) role.

    Science.gov (United States)

    Aitken, Murray

    2016-01-01

    Fundamental changes in the marketplace for medicines, as well as the rapid and continuing evolution of technology are bringing new challenges and opportunities for life sciences companies and their contribution to healthcare systems. These changes bring pressure on chief information officers (CIOs) within the healthcare industry to play an increasingly strategic role in advancing business success and delivering digital transformation.

  14. High confinement and high density with stationary plasma energy and strong edge radiation cooling in the upgraded Torus experiment for technology oriented research (TEXTOR-94)

    NARCIS (Netherlands)

    Messiaen, A. M.; Ongena, J.; Unterberg, B.; Boedo, J.; Fuchs, G.; R. Jaspers,; Konen, L.; Koslowski, H. R.; Mank, G.; Rapp, J.; Samm, U.; Vandenplas, P. E.; Van Oost, G.; van Wassenhove, G.; Waidmann, G.; Weynants, R. R.; Wolf, G. H.; Bertschinger, G.; Bonheure, G.; Brix, M.; Dumortier, P.; Durodie, F.; Finken, K.H.; Giesen, B.; Hillis, D.; Hutteman, P.; Koch, R.; KramerFlecken, A.; Lyssoivan, A.; Mertens, P.; Pospieszczyk, A.; PostZwicker, A.; Sauer, M.; Schweer, B.; Schwelberger, J.; Telesca, G.; Tokar, M. Z.; Uhlemann, R.; Vervier, M.; Winter, J.

    1997-01-01

    An overview of the results obtained so far for the radiative I-mode regime on the upgraded Torus Experiment for Technology Oriented Research (TEXTOR-94) [Proceedings of die 16th IEEE Symposium on Fusion Engineering (Institute of Electrical and Electronics Engineers, Piscataway, NJ, 1995), Vol. 1, p.

  15. 1st International Conference on Data Engineering and Communication Technology

    CERN Document Server

    Bhateja, Vikrant; Joshi, Amit

    2017-01-01

    This two-volume book contains research work presented at the First International Conference on Data Engineering and Communication Technology (ICDECT) held during March 10–11, 2016 at Lavasa, Pune, Maharashtra, India. The book discusses recent research technologies and applications in the field of Computer Science, Electrical and Electronics Engineering. The aim of the Proceedings is to provide cutting-edge developments taking place in the field data engineering and communication technologies which will assist the researchers and practitioners from both academia as well as industry to advance their field of study.

  16. Bioenergy Technologies Office FY 2017 Budget At-A-Glance

    Energy Technology Data Exchange (ETDEWEB)

    None

    2016-03-01

    The Bioenergy Technologies Office (BETO) is accelerating the commercialization of first-of-a-kind technologies that use our nation’s abundant renewable biomass resources for the production of advanced biofuels and biobased products. Non-food sources of biomass, such as algae, agricultural residues and forestry trimmings, and energy crops like switchgrass, are being used in BETO-supported, cutting-edge technologies to produce drop-in biofuels, including renewable gasoline, diesel, and jet fuels. BETO is also investigating how to improve the economics of biofuel production by converting biomass into higher-value chemicals and products that historically have always been derived from petroleum.

  17. On Edge Detection,

    Science.gov (United States)

    1984-08-01

    T. 0. "On boundary detection." A. I. Memo 183, MIT, 1980. Hildreth, E. C. "Implementation of a theory of edge detection ." A. /. Memo 579, MIT, 1980...Detection." IEEE Trans. PAMI, 6, 678-680, 1983. Marr, 0. C. and Hildreth, E. C, " Theory of edge detection ." Proc. R. Soc. Lond. B, 207, 187-217, 1980. Marr

  18. Basics of cutting and abrasive processes

    CERN Document Server

    Toenshoff, Hans Kurt

    2013-01-01

    Manufacturing is the basic industrial activity generating real value. Cutting and abrasive technologies are the backbone of precision production in machine, automotive and aircraft building as well as of production of consumer goods. We present the knowledge of modern manufacturing in these technologies on the basis of scientific research. The theory of cutting and abrasive processes and the knowledge about their application in industrial practice are a prerequisite for the studies of manufacturing science and an important part of the curriculum of the master study in German mechanical engineering. The basis of this book is our lecture “Basics of cutting and abrasive processes” (4 semester hours/3 credit hours) at the Leibniz University Hannover, which we offer to the diploma and master students specializing in manufacturing science.

  19. Simulation and Analysis of ACDR-oriented Vertebral Endplate Cutting Process

    Directory of Open Access Journals (Sweden)

    Heqiang Tian

    2015-09-01

    Full Text Available In the artificial cervical disc replacement (ACDR, the polishing quality of fitting surface between vertebral endplate and artificial intervertebral disc has a direct relation with operation result. For this reason, an in-depth study is necessary on the vertebral endplate cutting process. This paper is intended to simulate and analyze the cutting process of vertebral endplate using numerical computation method. Firstly, a plane cutting model is established through an analysis on the cutting process to simulate the single-edge cutting process, and the temperature distribution calculation is carried out using the mean heat flux of continuous cutting. Secondly, a vertebral endplate material constitutive model is established on the basis of the endplate anatomy and mechanical property, so that some problems are analyzed about simulation algorithm, frictional contact and chip separation in the vertebral endplate cutting finite element (FE simulation. Finally, stress distribution, cutting force, endplate deformation and residual stress and cutting temperature, as well as simulation results, are analyzed in vertebral endplate cutting process. The FE simulation may simplify vertebral endplate cutting, improve analytical precision, avoid plenty of repetitive cutting experiments, and reduce research cost greatly. Moreover, it gives full and fine description to the whole continuous, dynamic cutting process. All of this lay solid theoretical basis for an in-depth study of influence of different cutting parameters on endplate cutting as well as improvement of operation effect.

  20. The Seasonal Dynamics of Artificial Nest Predation Rates along Edges in a Mosaic Managed Reedbed.

    Directory of Open Access Journals (Sweden)

    Iain Malzer

    Full Text Available Boundaries between different habitats can be responsible for changes in species interactions, including modified rates of encounter between predators and prey. Such 'edge effects' have been reported in nesting birds, where nest predation rates can be increased at habitat edges. The literature concerning edge effects on nest predation rates reveals a wide variation in results, even within single habitats, suggesting edge effects are not fixed, but dynamic throughout space and time. This study demonstrates the importance of considering dynamic mechanisms underlying edge effects and their relevance when undertaking habitat management. In reedbed habitats, management in the form of mosaic winter reed cutting can create extensive edges which change rapidly with reed regrowth during spring. We investigate the seasonal dynamics of reedbed edges using an artificial nest experiment based on the breeding biology of a reedbed specialist. We first demonstrate that nest predation decreases with increasing distance from the edge of cut reed blocks, suggesting edge effects have a pivotal role in this system. Using repeats throughout the breeding season we then confirm that nest predation rates are temporally dynamic and decline with the regrowth of reed. However, effects of edges on nest predation were consistent throughout the season. These results are of practical importance when considering appropriate habitat management, suggesting that reed cutting may heighten nest predation, especially before new growth matures. They also contribute directly to an overall understanding of the dynamic processes underlying edge effects and their potential role as drivers of time-dependent habitat use.