WorldWideScience

Sample records for non-participating permanent formwork

  1. Formwork tectonics

    DEFF Research Database (Denmark)

    Manelius, Anne-Mette

    2012-01-01

    På engelsk: Based on the concept of techné and framed in architectural studies of tectonics and an experimental practice of making, this paper investigates the multiple technological roles of textiles in fabric formwork for concrete in four analytical studies of experimental data of the author’s ...

  2. COMPARISON TRADITIONAL SYSTEMS OF TUNNEL FORMWORK SYSTEM

    OpenAIRE

    ERKAN, İbrahim Hakkı; Yılmaz, Ülkü Sultan; Türken, Hakan

    2011-01-01

    Tunnel formwork systems became the most widespread construction technology preferred in recent years in Turkey due to rapidity and economy. In this study, before all else, a brief information was given about the types and construction techniques of tunnel formwork systems. Then a reinforced concrete building sample was firstly modeled as it was constructed with the tunnel formwork system and secondly modeled as it was formed by a frame system with shear walls constructed by the traditional re...

  3. Improving Formwork Engineering Using the Toyota Way

    Directory of Open Access Journals (Sweden)

    Jiun-De Kuo

    2011-07-01

    Full Text Available Construction is a labor-intensive industry with formwork engineering requiring a disproportionate amount of labor and costs. Formwork accounts for approximately one-third of the cost of reinforced concrete construction, partly because traditional formwork processes frequently result in delivery delays and material waste. The purpose of this research is to adapt production concepts pioneered by Toyota (the “Toyota Way” to improve formwork engineering. The Toyota Way of production consists of four tiers of management philosophy, known as the “4Ps” model. This research adopts the 4Ps as steps for formwork improvement. The first step, “establishing long term vision,” emphasizes long term considerations for formwork improvement. Step two, “establishing value streams,” reviews formwork flows and eliminates wastage. The third step, “developing the crew,” forms mold workers as a team. The final step is “developing a culture of continuous improvement” that provides a basis for constant review and provides a basis for continuous progress. The present research used the Toyota Way to improve formwork engineering. The improvements include reductions in resource waste and increases in operational value. In the long run, the proposed model could provide a learning and growth platform for individuals, the business unit, and the company’s extended network of partners. It could also serve to spur innovative thinking in the improvement of formwork engineering.

  4. Formwork application optimization by using augmented reality

    Science.gov (United States)

    Diaconu, R.; Petruse, R.; Brindasu, P. D.

    2016-11-01

    By using the PLM (Product Lifecycle Management) principle on the formwork case study, after determining the functions and the technical solutions, the application must be made as optimum as possible in order to assure productivity and provide the necessary information as quick as possible. The concept is to create a complex management for the formwork based on augmented reality. By taking into account the development rate of the information, augmented reality is tending to be one of the widest (in term of domain) visualization instrument. Also used in the construction domain, augmented reality can be applied also for the case of formwork design and management. The application of the solution will be retrieved in the construction of the product, its transportation and deposit. The usage of this concept will help reduce, even eliminate human or technical errors and can offer a precise state of a specific required formwork from the stock.

  5. 美国几种主要模架体系介绍%INTRODUCTION OF AMERICAN MAIN FORMWORK SYSTEM

    Institute of Scientific and Technical Information of China (English)

    糜嘉平

    2012-01-01

    通过介绍美国较常用到的模板体系,如Max-A-Form墙柱模板、房建隧道模、Flex-Form弧形模板等全钢模板体系,还有Alisply墙模板、Stell-Ply组合模板、Versiform墙柱模板等钢框胶合板模板、铝合金模板和支撑系统,为国内同行做一窗口展示.%Full-steel formwork systems, such as Max-A-Form wall column formwork, tunnel formwork for house and Flex-Form arch formwork, etc., and steel frame plywood formwork, aluminium alloy formwork and supporting systems, such as Alisply wall formwork, Steel-Ply built-up formwork and Versiform wall column formwork, etc., which are frequently used in America are introduced to provide references for domestic industrial practitioners.

  6. Analysis of Lotuses that High-formwork Supports Bear and the Construction Suggestion

    Institute of Scientific and Technical Information of China (English)

    Zeng Fankui; Liu Xuebing; Zhang huazhen; Shi xiuqin

    2007-01-01

    With the development of our countryl's city modernization construction,the high-formwork supports system was used more and more,but national standard of high-formwork supports has been not officially promulgated[1]at present,so we do not have a unified standard in high-formwork supports design and construction.This text puts forward some views about windload by calculating and analyzing the effects that windload causes to the structure.

  7. Doka formwork system SL-1 for tunneling. Example: Šentvid tunnel

    OpenAIRE

    Pogačar, Boris

    2006-01-01

    The present work focuses on formwork system SL-1, which was developed by the company Doka - die Schalungstechniker for forming of tunnels and special structures. Formwork in general is presented, along with the methods of tunneling, which are in use today. Doka formwork system SL-1 and its typical parts are described in detail. The use of this formwork system is represented on the example of a cavern in Šentvid tunnel. Discussed are two possible shapes of the cavern: the form of three resembl...

  8. An evaluation of controlled permeability formwork for long-term durability of structural concrete elements

    Energy Technology Data Exchange (ETDEWEB)

    Suryavanshi, A.K.; Swamy, R.N. [Univ. of Sheffield (United Kingdom). Dept. of Mechanical Engineering

    1997-07-01

    The long-term performance of a concrete slab (CPF slab) exposed to chloride ingress and atmospheric carbonation from the surface generated by controlled permeability formwork (CPF) is investigated. The results are compared with a similar slab exposed to long-term chloride ingress and atmospheric carbonation from the cast face (Control slab). Techniques such as X-ray diffraction (XRD) and differential thermal analyses (DTA) were employed to determine the resistance against carbonation while, mercury porosimetry was used for investigating the pore size distribution at the surface of the slabs. Amount of acid soluble chlorides was determined by using Volhard`s method. The CPF employed at the bottom of the mould was not fully effective in its intended purpose of generating a permanent and dense impermeable concrete layer adjacent to it when the design water-cement (w/c) ration of the concrete mix was 0.60. This resulted in an almost similar extent of carbonation at the surface for both CPF and control slabs as shown by XRD and DTA studies. Similarly, there were no significant differences in the amount of chlorides and their depths of penetration for both CPF and control slabs, although the former was marginally superior in chloride penetration resistance at the surface.

  9. Formwork pressure exerted by self-consolidating concrete

    Science.gov (United States)

    Omran, Ahmed Fathy

    Self-consolidating concrete (SCC) is an emerging technology that utilizes flowable concrete that eliminates the need for consolidation. The advantages of SCC lie in a remarkable reduction of the casting time, facilitating the casting of congested and complex structural elements, possibility to reduce labor demand, elimination of mechanical vibrations and noise, improvement of surface appearance, producing a better and premium concrete product. The research focussed on capturing existing knowledge and making recommendations for current practice. An experimental program was undertaken at the Universite de Sherbrooke to evaluate the lateral pressure developed by SCC mixtures. A portable devise (UofS2 pressure column) for measuring and predicting lateral pressure and its rate of decay of SCC was developed and validated. The UofS2 pressure column is cast with 0.5 m high fresh concrete and air pressure is introduced from the top to simulate casting depth up to 13 m. Then, develop and implement test method for field evaluation of relevant plastic and thixotropic properties of SCC that affect formwork pressure were done. Portable vane (PV) test based on the hand-held vane test method used to determine the undrained shear strength property of clay soil was the first setup as well as the inclined plane (IP) test. The IP device involves slumping a small concrete cylinder on a horizontal plate and then lifting up the plate at different durations of rest until the slumped sample starts to move. Identifying role of material constituents, mix design, concrete placement characteristics (casting rate, waiting periods between lifts, and casting depth), temperature, and formwork characteristics that have major influence on formwork pressure exerted by SCC were evaluated in laboratory and validated by actual field measurements. Relating the maximum lateral pressure and its rate of decay to the plastic properties of SCC were established. In the analytical part of the research

  10. MATHEMATICAL MODELING OF THE OPTIMUM MODES OF CONCRETING WITH THE USE OF PNEUMATIC FORMWORK

    Directory of Open Access Journals (Sweden)

    A. N. Tkachenko

    2010-12-01

    Full Text Available Problem statement. The construction of a sufficient theoretical model of pneumatic formwork work and description of the dependence of strength properties of the concrete obtained on various parameters of the process of shotcreting is an urgent problem.Results and conclusions. Experimental-theoretical model of the technological process of fine-grained concrete mix shotcreting on horizontally located pneumatic formwork is presented. Recoil indicator and concrete strength dependence on such parameters, as the productive capacity of shotcrete-machine, the nozzle diameter, the distance from the nozzle to the formwork surface and tension of pneumatic formwork material. The comparison of theoretical dependences and experimental ones has shown their qualitative correspondence.

  11. Workers' medication as occupational risk at construction site with formworks.

    Science.gov (United States)

    López-Arquillos, Antonio; Rubio-Romero, Juan Carlos; López-Arquillos, Concepción

    2017-01-01

    Accidents in the construction sector are a cause for concern. The influence of many different factors in construction accidents have been studied (age, company size, length of service, deviation, drugs or alcohol consumption, etc.) but the influence of medicinal substances in specific construction activities has not been evaluated until now. The aim of the research presented here is to identify the effect of different medicinal substances on the occupational risk levels of construction activities with formworks. An expert panel was selected in order to quantify the individual risk of each medication for each individual construction activity. Results showed that narcotics, antipsychotics, and hypnotics had the highest risk values, and the use of cranes and cutting materials were considered the most dangerous activities for a medicated worker. Data obtained in this research can help reduce the negative effects of the substances studied on the occupational safety of construction workers. A better knowledge of the risk levels according to the current capabilities of workers under the effects of medication is a powerful tool in planning safer construction activities.

  12. Predictors of non-participation in cervical screening in Denmark

    DEFF Research Database (Denmark)

    Kristensson, Jenny Hansen; Sander, Bente Braad; von Euler-Chelpin, My

    2014-01-01

    PURPOSE: The aims of this study were to identify demographic and socio-economic predictors of non-participation in cervical screening in Denmark, and to evaluate the influence of health care use on screening participation. METHODS: A population based register study was undertaken using data from ...

  13. Non-participants and reasons for non-participation in a pragmatic trial of energy healing as cancer rehabilitation

    DEFF Research Database (Denmark)

    Techau, Marzcia Elisa Camille; Lunde, Anita; Pedersen, Christina Gundgaard;

    2014-01-01

    -participation in a pragmatic trial of energy healing for rehabilitation for colorectal cancer. Methods: Three to seven days after postal recruitment, all eligible participants (n=783) were contacted by telephone. Reasons given for non-participation were recorded in 5 categories. Data were analyzed using Chi2. Results: More...

  14. Mortality of non-participants in cervical screening

    DEFF Research Database (Denmark)

    Dugué, Pierre-Antoine; Lynge, Elsebeth; Rebolj, Matejka

    2014-01-01

    a HR of 2.09 (95% CI: 2.05-2.14) compared to regular participants. The HR for human papillomavirus (HPV)-related cancers other than cervical cancer was 3.80 (95% CI: 2.67-5.41). Younger women, whose coverage rates were higher, had higher all-cause mortality HRs. Women screened more frequently than......The selective uptake of screening by healthy participants and its impact on the evaluation of screening effectiveness in non-randomized studies have been discussed, but hardly studied. We quantified excess mortality among cervical screening non-participants compared to participants. Based on Danish...... healthcare registers, we determined women's participation in cervical screening in 1990-1993 (one screening round) and 1990-1997 (two screening rounds). Women were followed until end of 2010. We computed hazard ratios (HR) comparing non-participants' and participants' risk of death, and analyzed the impact...

  15. An exploratory review on critical factors of IBS formwork implementation for Malaysian construction stakeholders

    Science.gov (United States)

    Baharuddin, Mohd Nurfaisal; Bahardin, Nur Fadhilah; Zaidi, Mohd Azian; Lokman, Ikhwan; Nawi, Mohd Nasrun Mohd

    2016-08-01

    The goals of this paper is to analysed the critical factors of driving or hindering the used of Industrialised Building System (IBS) formwork system in the Malaysian construction industry. Based on the reviews of a previous research and related literature, this paper was identified four (4) critical factor that classified as a difficulties to the success of IBS formwork system application; The issues related to the lack of knowledge and awareness, high cost and financial barriers, lack of incentive and promotion and lack of enforcement for government policy were highlight as a key dimension for the uses of IBS formwork system to success. The objective of this paper is to determine the importance factors in implementing IBS formwork in Malaysia. A preliminary survey which qualitative research approach has been adopted for this study as to validate the factors which found in the literature study. Based on the result analysis, it can be confirmed that the entire factors in literature review are strongly related with challenges in construction industry.

  16. Stay-in-Place Formwork of TRC Designed as Shear Reinforcement for Concrete Beams

    Directory of Open Access Journals (Sweden)

    S. Verbruggen

    2013-01-01

    Full Text Available In order to reduce on-site building time, the construction industry shows an increasing interest in stay-in-place formwork with a reinforcement function after concrete hardening, such as CFRP formwork confinement for columns. The current combined systems however do not answer the demand of the building industry for a material system that is both lightweight and fire safe. High performance textile reinforced cement (TRC composites can address this need. They can be particularly interesting for the shear reinforcement of concrete beams. This paper describes a preliminary analysis and feasibility study on structural stay-in-place formwork made of TRC. Comparative bending experiments demonstrate that a fully steel reinforced beam and an equivalent beam with shear reinforcement in TRC formwork show similar yielding behaviour, indicating that the TRC shear reinforcement system actually works. Moreover, the cracking moment of the concrete was more or less doubled, resulting in a much lower deflection in serviceability limit state than calculated. Digital image correlation measurements show that the latter is due to the crack bridging capacity of the external TRC shear reinforcement.

  17. Formwork pressure of self-consolidating concrete: Influence of flocculation mechanisms, structural rebuilding, thixotropy and rheology

    Science.gov (United States)

    Ferron, Raissa Patricia Douglas

    While self-consolidating concrete (SCC) may no longer be considered a "new concrete", there are still significant challenges to overcome before there is broader acceptance of SCC. One of these challenges concerns the formwork pressure exerted by SCC. A major advantage of SCC is the accelerated casting process due to the elimination of external vibration. However, faster casting rates may induce higher formwork pressure; this is a major concern for cast-in place applications, especially when casting tall elements. It has been reported that the formwork pressure of SCC can be less than hydrostatic pressure. This is due to the build-up of a three-dimensional structure when the concrete is left at rest. The development of this structure and the mechanisms behind it are of particular interest to users of SCC. The research presented in this manuscript was carried out at the Center for Advanced Cement-Based Materials at Northwestern University and the Universidad Complutense de Madrid. This dissertation focuses on the structural rebuilding SCC and its implications for formwork pressure. Special emphasis was given to the influence of flocculation mechanisms and the impact of material constituents. A rheological protocol to characterize structural rebuilding was developed. This protocol can be used to assess the contributions from irreversible structural build-up from hydration and reversible structural rebuilding from thixotropic effects. The impact of various mixture ingredients, including cement type, mineral admixtures, chemical admixtures and clays, on the structural rebuilding was examined. The results showed that the rheological properties of the paste matrix and its evolution over time can be used as an indication of the formwork pressure behavior. Formwork pressure is highly impacted by the structural rebuilding that occurs in the paste matrix, and the results showed that formwork pressure is related to the rate at which structural rebuilding occurs and the total

  18. 我国模板、脚手架行业的技术进步%Technology Progress of Formwork and Scaffold Industry in China

    Institute of Scientific and Technical Information of China (English)

    糜嘉平

    2011-01-01

    介绍了我国模板和脚手架行业的发展情况.从组合钢模板、竹胶合板模板、木胶合板模板、钢框胶合板模板、桥隧模板、塑料模板几个方面介绍了我国模板行业的技术进步现状.介绍了我国脚手架行业的技术进步情况和存在的问题.对行业技术创新工作提出了几点建议:积极开发新型模板技术;做好水平模板施工的技术创新;大力推广应用新型脚手架;提倡建立有技术特色的专业模板公司.%Development status of formwork and scaffold industry in China is introduced. Technology progress of formwork industry is introduced based on combined steel plate, bamboo plywood formwork,wood plywood formwork, steel-framed plywood formwork, bridge and tunnel formwork and plastic formwork. Technology progress and some problems of scaffold industry are also introduced. Furthermore,some advices are proposed such as developing actively new type formwork technology, technology innovation of horizontal formwork construction, popularization and application of new type scaffold, and setting up professional formwork companies.

  19. PERFORMANCE AND CONSTRUCTION TECHNIQUE OF PLASTIC FORMWORK%塑料模板的性能及其应用施工技术

    Institute of Scientific and Technical Information of China (English)

    郑华

    2012-01-01

    PVC木塑建筑模板和改性增强聚丙烯复合材料模板是目前应用较成熟的塑料模板,塑料模板加工制作及施工工艺同木模板较相似,但在工程实践中,应考虑塑料模板的材质特性,制定工艺标准,以满足工程施工要求.%PVC wood-plastic building formwork and modified reinforced polypropylene composite formwork are mature plastic formworks used at present. Processing and construction techniques of plastic formwork are similar to that of wood formwork. During practical application, material characteristics of plastic formwork shall be considered and technical requirements shall be established to satisfy the engineering construction requirements.

  20. BUILDABILITY FACTORS THAT INFLUENCE MICRO-LEVEL FORMWORK LABOUR PRODUCTIVITY OF BEAMS IN BUILDING FLOORS

    OpenAIRE

    Jarkas, Abdulaziz M

    2011-01-01

    Buildability is one of the most important factors that influence labour productivity. Nevertheless, a thorough literature examination revealed a dearth of research concerning the effects of buildability on labour productivity of in situ reinforced concrete construction. Beams are major components of building floors, and the objective of this investigation is to explore the buildability factors that influence their micro-level formwork labour productivity. Therefore, a large volume of producti...

  1. Comparison and Analysis for High Pier Formwork Construction of Bridge Engineering%桥梁工程高墩模板施工技术比较分析

    Institute of Scientific and Technical Information of China (English)

    易达; 葸振东

    2016-01-01

    The economical indexes for suspension formwork, climbing formwork, sliding formwork, roller formwork and hanging formwork construction used in bridge piers are compared. From the construction principle, formwork cost, personnel and equipment, construction schedule, construction quality and safety, this paper describes their applicability. The analysis results show that if the bridge has oblique piers, the hydraulic climbing formwork is best; if the pier is not high and has loose schedule, the suspension formwork is suitable;and if it has tight schedule, the sliding formwork should be considered;if considering the comprehensive factors, hanging formwork and roller formwork should be applied.%对桥梁工程高墩用悬模、爬模、滑模、辊模和吊模施工技术经济指标进行比较,从各种施工技术的原理、模板系统成本、人员及机械设备、施工进度、施工质量和施工安全性等方面阐述了其适用性.分析结果表明:如果是带斜率的桥墩施工,则最好用液压爬模施工;如果桥墩不高、进度宽松时可以用悬模施工;强调进度的山区高墩,可考虑滑模施工;如果综合考虑各方因素,则可考虑吊模、辊模施工.

  2. 不同底模对砂浆强度的影响%Effect of Different Bottom Formwork on Strength of Mortar

    Institute of Scientific and Technical Information of China (English)

    孙永民; 胡长明; 宋方方

    2012-01-01

    The strength of cement mortar and mixed mortar with different bottom formwork were studied by tests. Results show that under the same consistency, the change of bottom mould has bigger influence on the strength of cement mortar than mixed mortar. Specifically, the discreteness of mortar strength with steel formwork is smaller than that with brick formwork. With the change of consistency, the cement mortar strength shows higher variation with steel formwork than with brick formwork. However for mixed mortar strength, the influence of consistency with steel formwork is smaller than that with brick formwork.%通过对不同底模的水泥砂浆试块和混合砂浆试块的强度试验研究,在相同稠度情况下,采用不同底模时,水泥砂浆强度比混合砂浆强度影响大.研究结果表明:钢底模比砖底模的离散性小;随着稠度变化,水泥砂浆采用钢底模比采用砖底模影响因素大,但混合砂浆采用钢底模比砖底模影响因素小.

  3. No interest in landscape? The art of non-participation in Danish landscape planning

    DEFF Research Database (Denmark)

    Clausen, Laura Tolnov

    2017-01-01

    landscape planning, two key categories are identified as the deeper causes of people’s non-participation: the fear of the intimate, and the fear of the strange. A general conclusion is that non-participation can be explained in terms of ambivalence. The desire for landscape development does exist...

  4. 玻璃钢模板房屋建筑施工技术%On construction technique of glass steel formwork of buildings

    Institute of Scientific and Technical Information of China (English)

    张转院

    2012-01-01

    The paper illustrates the concepts and features of the glass steel, introduces the advantages of the glass steel formwork in buildings by comparing it with the traditional formwork, and researches the construction technique of the glass steel formwork in buildings, so as to lay the foundation for extending the glass steel formwork.%简要叙述了玻璃钢的概念及特点,介绍了房屋建筑中玻璃钢模板相比传统模板所具有的优点,重点对玻璃钢模板房屋建筑施工技术进行了研究,为玻璃钢模板的推广应用奠定了基础。

  5. Non-participation in population-based disease prevention programs in general practice

    Directory of Open Access Journals (Sweden)

    Koopmans Berber

    2012-10-01

    Full Text Available Abstract Background The number of people with a chronic disease will strongly increase in the next decades. Therefore, prevention of disease becomes increasingly important. The aim of this systematic review was to identify factors that negatively influence participation in population-based disease prevention programs in General Practice and to establish whether the program type is related to non-participation levels. Methods We conducted a systematic review in Pubmed, EMBASE, CINAHL and PsycINFO, covering 2000 through July 6th 2012, to identify publications including information about characteristics of non-participants or reasons for non-participation in population-based disease prevention programs in General Practice. Results A total of 24 original studies met our criteria, seven of which focused on vaccination, eleven on screening aimed at early detection of disease, and six on screening aimed at identifying high risk of a disease, targeting a variety of diseases and conditions. Lack of personal relevance of the program, younger age, higher social deprivation and former non-participation were related to actual non-participation. No differences were found in non-participation levels or factors related to non-participation between the three program types. The large variation in non-participation levels within the program types may be partly due to differences in recruitment strategies, with more active, personalized strategies resulting in higher participation levels compared to an invitation letter. Conclusions There is still much to be gained by tailoring strategies to improve participation in those who are less likely to do so, namely younger individuals, those living in a deprived area and former non-participants. Participation may increase by applying more active recruitment strategies.

  6. Fabric formwork

    DEFF Research Database (Denmark)

    Manelius, Anne-Mette

    2012-01-01

    Afhandlingen er resultatet af et erhvervsPhDprojekt om tekstilforskalling, en ny støbemetode som udnytter tekstilers høje trækstyrke til konstruktion af beton. Det er projektets praktiske hypotese, at koblingen af eksisterende materialeteknologier indenfor beton- og tekstilindustri vil bidrage ti...

  7. 高大模板支撑架体施工技术%Construction technology of high formwork bracing frame

    Institute of Scientific and Technical Information of China (English)

    马姗姗

    2012-01-01

    Combining with the architectural structure styles of the engineering gate and auxiliary project,in light of relevant contents of construction technology of high formwork bracing frame,the paper mainly introduces and analyzes the formwork design calculation,structural method,process acceptance and quality control and so on.Practice proves that meets the norms.Thus,it is worth promoting.%结合某工程大门楼及附属工程的建筑结构形式,针对高支模架施工技术的相关内容,重点对模架设计计算、构造做法、过程验收、质量控制等方面做了介绍和分析,经过实例验证均符合规范要求,值得推广使用。

  8. Non-participation during azithromycin mass treatment for trachoma in The Gambia: heterogeneity and risk factors.

    Directory of Open Access Journals (Sweden)

    Tansy Edwards

    2014-08-01

    Full Text Available There is concern that untreated individuals in mass drug administration (MDA programs for neglected tropical diseases can reduce the impact of elimination efforts by maintaining a source of transmission and re-infection.Treatment receipt was recorded against the community census during three MDAs with azithromycin for trachoma in The Gambia, a hypo-endemic setting. Predictors of non-participation were investigated in 1-9 year olds using random effects logistic regression of cross-sectional data for each MDA. Two types of non-participators were identified: present during MDA but not treated (PNT and eligible for treatment but absent during MDA (EBA. PNT and EBA children were compared to treated children separately. Multivariable models were developed using baseline data and validated using year one and two data, with a priori adjustment for previous treatment status. Analyses included approximately 10000 children at baseline and 5000 children subsequently. There was strong evidence of spatial heterogeneity, and persistent non-participation within households and individuals. By year two, non-participation increased significantly to 10.4% overall from 6.2% at baseline, with more, smaller geographical clusters of non-participating households. Multivariable models suggested household level predictors of non-participation (increased time to water and household head non-participation for both PNT and EBA; increased household size for PNT status only; non-inclusion in a previous trachoma examination survey and younger age for EBA only. Enhanced coverage efforts did not decrease non-participation. Few infected children were detected at year three and only one infected child was EBA previously. Infected children were in communities close to untreated endemic areas with higher rates of EBA non-participation during MDA.In hypo-endemic settings, with good coverage and no association between non-participation and infection, efforts to improve participation

  9. BUILDABILITY FACTORS THAT INFLUENCE MICRO-LEVEL FORMWORK LABOUR PRODUCTIVITY OF BEAMS IN BUILDING FLOORS

    Directory of Open Access Journals (Sweden)

    Abdulaziz M. Jarkas

    2011-10-01

    Full Text Available Buildability is one of the most important factors that influence labour productivity. Nevertheless, a thorough literature examination revealed a dearth of research concerning the effects of buildability on labour productivity of in situ reinforced concrete construction. Beams are major components of building floors, and the objective of this investigation is to explore the buildability factors that influence their micro-level formwork labour productivity. Therefore, a large volume of productivity data was collected and analysed using a categorical interaction-regression method. As a result, the main and interaction effects of beam repetition, size, intersections and span geometry were determined. The obtained results indicate that the investigated factors significantly influence the forming operation labour efficiency and substantiate the importance of applying design rationalisation, standardisation and repetition concepts to the design stage of construction projects. The findings satisfy the explored activity buildability knowledge gap, which can be used to provide designers with feedback on how well their designs consider the buildability principle requirements, as well as their decision consequences on the forming operation productivity.

  10. Initial non-participation and loss to follow-up in a Danish youth cohort

    DEFF Research Database (Denmark)

    Winding, Trine Nøhr; Andersen, Johan H; Labriola, Merete;

    2014-01-01

    BACKGROUND: Initial non-participation and loss to follow-up in the Danish youth cohort Vestliv could introduce selection bias of the measured risk estimates. OBJECTIVE: To investigate the impact of initial non-participation and loss to follow-up on the validity of descriptive measures and selected...... better school abilities and came more often from homes with two adults, higher income or higher educational level. These differences increased at subsequent follow-ups. The effect of initial non-participation on the ORs was modest with most RORs being close to one. Loss to follow-up led to larger...... variations in the RORs ranging from 0.77 to 1.62 although for most estimates, the bias was minor. None of the measured RORs were statistically different from one indicating no significant bias. CONCLUSIONS: Although certain characteristics were related to those who initially chose to participate...

  11. Using participant or non-participant observation to explain information behaviour. Participant observation, Non-participant observation, Information behaviour, Hospital pharmacists, Older people

    Directory of Open Access Journals (Sweden)

    Janet Cooper

    2004-01-01

    Full Text Available The aim of the paper is to provide guidance on conducting participant and non-participant observation studies of information behaviour. Examines lessons learned during non-participant observation of hospital pharmacists, and participant observation with dependent older people living in their own homes. Describes the methods used in both studies, and discusses the ethical issues involved in gaining access to the subjects. In the hospital setting, professional affiliation between the researcher and the subjects (six pharmacists made access easier to obtain. In the home care setting, access to subjects (seven clients for participant observation (as a care worker was more difficult, as was withdrawal from the field study. In both studies, the observation element was triangulated with survey data. Both studies indicated the fundamental need for trust between the observer and the research subjects. In some situations, professional relations offer instant access and trust, whereas in closed and sensitive situations such as social care, time is required to build up trust. With participant observation, that trust should not be damaged by withdrawal of the researcher from the research setting.

  12. The Non-Participation Survey: Understanding Why High School Students Choose Not to Eat School Lunch

    Science.gov (United States)

    Asperin, Amelia Estepa; Nettles, Mary Frances; Carr, Deborah H.

    2010-01-01

    Purpose/Objectives: The purpose of this project was to develop and validate a survey that will enable school nutrition (SN) directors and managers to identify and address issues affecting the non-participation of high school students in the National School Lunch Program (NSLP). Methods: The research was conducted in two phases. Qualitative data…

  13. Non-participation in preventive child health examinations at the general practitioner in Denmark

    DEFF Research Database (Denmark)

    Søndergaard, Grethe; Biering-Sørensen, Sofie; Michelsen, Susan Ishøy

    2008-01-01

    , and older siblings) and parental characteristics (age, educational level, attachment to labour market, ethnicity, household income, and number of adults in the household). Results. Children of young and single parents were less likely to receive a preventive child health examination. Increased odds ratios......Objective. To examine demographic and socioeconomic characteristics of parents and children in families not participating in preventive child health examinations at the general practitioner in a society with free and easy access to healthcare. Design. Population-covering register linkage study...... for non-participation were found for children of parents outside the labour market, with low educational level, and especially for the combination of these. Non-participation increased with decreasing household income and with the number of older siblings. Conclusion. Despite the fact that Denmark has...

  14. Non-participation in systematic screening for osteoporosis-the ROSE trial

    DEFF Research Database (Denmark)

    Rothmann, M J; Möller, S; Holmberg, T

    2017-01-01

    education, lower income, and higher comorbidity. In the intervention group, ticking "not interested in DXA" in the questionnaire was associated with older age, living alone, and low self-perceived fracture risk. Women with previous fracture or history of parental hip fracture were more likely to accept......Population-based screening for osteoporosis is still controversial and has not been implemented. Non-participation in systematic screening was evaluated in 34,229 women age 65-81 years. Although participation rate was high, non-participation was associated with comorbidity, aging other risk factors...... for fractures, and markers of low social status, e.g., low income, pension, and living alone. A range of strategies is needed to increase participation, including development of targeted information and further research to better understand the barriers and enablers in screening for osteoporosis. INTRODUCTION...

  15. RESEARCH AND CONSIDERATION OF FORMWORK DEVELOPMENT STRATEGY IN CHINA%我国模板发展战略问题的研究与思考

    Institute of Scientific and Technical Information of China (English)

    王绍民

    2011-01-01

    Low-quality and inefficient plain plywood formworks which require high material and energy consumptions and produce a lot of garbage causing environmental pollution are comprehensively used in domestic formwork engineering, bringing huge negative influences on the development of domestic architectural industry. Serious research and discussion are carried out for two mutually opposite opinions on formwork development, countermeasures and suggestions are put forward for the sustainable development of formwork engineering.%我国模板工程广泛使用高物耗、高能耗和产生大量垃圾污染环境的低质、低效素面木胶合板模板,给我国建筑业带来巨大的负面影响.通过对两种对立的模板发展观进行认真的研讨,提出了模板工程可持续发展的对策与建议.

  16. 波纹管圆柱定型模板施工技术%CONSTRUCTION TECHNIQUE OF TYPIFIED FORMWORK FOR CORRUGATED TUBE COLUMN

    Institute of Scientific and Technical Information of China (English)

    李海生; 张肇庆; 胡志军; 王洋; 章亮亮

    2011-01-01

    In the column construction of ZTE Nanjing Research and Development Center No.l Building, high-density polyethylene double-wall corrugated tubes with same diameter are used for formwork, which has smooth inner wall, high strength, light weight and annular corrugated outer wall. The pipe rigidity is increased obviously to avoid deformation; two semicircles are connected together to reduce the number of joint and to improve the forming quality of concrete after the formwork is removed. Compared with same type of typified steel formwork, the corrugated tube formwork has lower cost, more convenient construction and better economic benefit.%中兴通讯南京研发中心1号楼圆柱施工中,采用了直径相同的高密度聚乙烯双壁波纹管作为模板,该模板内壁光滑、强度高、重量轻,外壁呈现环波纹状结构,增加了管材的刚度,且不易变形;采用两个半圆组拼,减少了拼缝,可提高混凝土拆模后的成型质量.波纹管模板价格远低于同类型的定型钢模板,且施工方便,可取得较好的经济效益.

  17. 我国模板行业应走低碳经济发展之路%DOMESTIC FORMWORK INDUSTRY SHALL INSIST ON LOW-CARBON ECONOMIC DEVELOPMENT

    Institute of Scientific and Technical Information of China (English)

    王绍民

    2011-01-01

    Although the world is pursuing low emission, low energy consumption and low pollution, domestic formwork industry still comprehensively uses low-quality inefficient wooden plywood formwork with plain surface which requires high material and energy consumption, producing a great amount of garbage causing environmental pollution and making huge negative influences on development of domestic building industry. After discussion on two mutually opposite viewpoints about formwork development, measures and suggestions are proposed for sustainable development of formwork engineering.%在国家推行低排放、低能耗,低污染的大环境下,我国模板工程仍广泛使用高物耗、高能耗和产生大量垃圾污染环境的低质、低效素面木胶合板模板,有违我国低碳经济发展战略.通过对两种对立的模板发展观研讨,提出模板工程推行低碳经济发展的对策与建议.

  18. Influence of formwork surface on the orientation of steel fibres within self-compacting concrete and on the mechanical properties of cast structural elements

    DEFF Research Database (Denmark)

    Svec, Oldrich; Zirgulis, Giedrius; Bolander, John E.;

    2014-01-01

    The influences of formwork surface on the final orientation of steel fibres immersed in self-compacting concrete and on the resulting mechanical response of the cast structural elements are investigated. Experimental observations of fibre orientation within cast slabs, obtained via computed tomog...

  19. Essure Permanent Birth Control

    Science.gov (United States)

    ... Prosthetics Essure Permanent Birth Control Essure Permanent Birth Control Share Tweet Linkedin Pin it More sharing options ... System Essure is a a permanently implanted birth control device for women (female sterilization). Implantation of Essure ...

  20. CB10新型钢模板施工技术的应用%APPLICATION OF NEW CB10 STEEL FORMWORK CONSTRUCTION TECHNIQUE

    Institute of Scientific and Technical Information of China (English)

    晏金洲

    2011-01-01

    After the application of new CB10 steel formwork system in many projects, it is indicated that such formwork system has many characteristics, such as light weight, high strength, good rigidity, convenient assembly and dismantlement, flexible exchangeability and low cost. The concrete poured by using such formwork has high level -up degree, tight seam, high general efficienty,. No disalignment and slurry leakage. The construction requirements of plain concrete are well satisfied, the purposes on environmental protection and energy saving are reached, and technical conditions and measures are provided for green building.%通过对CB10新型钢模板体系在多个工程中的应用表明,该模板体系具有自重轻、强度大、刚性好、易拆装、互换性强、成本低,浇筑混凝土平整度高、接缝严密、无错台、不漏浆、综合效益高、可充分满足清水混凝土施工要求等特点.做到既环保又节能,从技术和措施上为绿色建筑的建成创造条件.

  1. Marxism as permanent revolution

    NARCIS (Netherlands)

    van Ree, E.

    2013-01-01

    This article argues that the 'permanent revolution' represented the dominant element in Karl Marx and Friedrich Engels' political discourse, and that it tended to overrule considerations encapsulated in 'historical materialism'. In Marx and Engels's understanding, permanent revolution did not repres

  2. Marxism as permanent revolution

    NARCIS (Netherlands)

    van Ree, E.

    2013-01-01

    This article argues that the 'permanent revolution' represented the dominant element in Karl Marx and Friedrich Engels' political discourse, and that it tended to overrule considerations encapsulated in 'historical materialism'. In Marx and Engels's understanding, permanent revolution did not

  3. National South African HIV prevalence estimates robust despite substantial test non-participation

    Directory of Open Access Journals (Sweden)

    Guy Harling

    2017-07-01

    Full Text Available Background. South African (SA national HIV seroprevalence estimates are of crucial policy relevance in the country, and for the worldwide HIV response. However, the most recent nationally representative HIV test survey in 2012 had 22% test non-participation, leaving the potential for substantial bias in current seroprevalence estimates, even after controlling for selection on observed factors. Objective. To re-estimate national HIV prevalence in SA, controlling for bias due to selection on both observed and unobserved factors in the 2012 SA National HIV Prevalence, Incidence and Behaviour Survey. Methods. We jointly estimated regression models for consent to test and HIV status in a Heckman-type bivariate probit framework. As selection variable, we used assigned interviewer identity, a variable known to predict consent but highly unlikely to be associated with interviewees’ HIV status. From these models, we estimated the HIV status of interviewed participants who did not test. Results. Of 26 710 interviewed participants who were invited to test for HIV, 21.3% of females and 24.3% of males declined. Interviewer identity was strongly correlated with consent to test for HIV; declining a test was weakly associated with HIV serostatus. Our HIV prevalence estimates were not significantly different from those using standard methods to control for bias due to selection on observed factors: 15.1% (95% confidence interval (CI 12.1 - 18.6 v. 14.5% (95% CI 12.8 - 16.3 for 15 - 49-year-old males; 23.3% (95% CI 21.7 - 25.8 v. 23.2% (95% CI 21.3 - 25.1 for 15 - 49-year-old females. Conclusion. The most recent SA HIV prevalence estimates are robust under the strongest available test for selection bias due to missing data. Our findings support the reliability of inferences drawn from such data.

  4. Self-assessed health, perceived stress and non-participation in breast cancer screening: A Danish cohort study

    DEFF Research Database (Denmark)

    Jensen, Line Flytkjær; Pedersen, Anette Fischer; Andersen, Berit

    2015-01-01

    Objective Population-based cancer screening is offered in many countries to detect early stages of cancer and reduce mortality. Screening efficiency and equality is susceptible due to a group of non-participants. We investigated associations between self-assessed health, perceived stress...... and subsequent non-participation in breast cancer screening. Methods This population-based cohort study included 4512 women who had participated in a Health Survey in 2006 and who were also the target group (aged 50–69 years) for the first organised breast cancer screening programme -3 years later in the Central...

  5. Adjusting HIV prevalence estimates for non-participation: an application to demographic surveillance

    Directory of Open Access Journals (Sweden)

    Mark E. McGovern

    2015-11-01

    % among those who participated in testing, and 18% estimated with imputation. We provide new confidence intervals that correct for the fact that the relationship between testing and HIV status is unknown and requires estimation. Conclusions: We confirm the feasibility and value of adopting selection models to account for missing data in population-based HIV surveys and surveillance systems. Elements of survey design, such as interviewer identity, present the opportunity to adopt this approach in routine applications. Where non-participation is high, true confidence intervals are much wider than those generated by standard approaches to dealing with missing data suggest.

  6. CONSTRUCTION TECHNIQUE OF HIGH AND LARGE FORMWORK OF WIDE-SPAN PRESTRESSED CONCRETE BEAM SLAB%大跨度预应力混凝土梁板高大模架施工技术

    Institute of Scientific and Technical Information of China (English)

    陈彤瑾

    2011-01-01

    Swimming pool is designed in an engineering.Multi-rank scaffold with combination of cuplok scaffold and fastener scaffold is adopted to erect the ceiling and high and large beam formwork of the swimming pool.Considering that this is a high and large formwork support system, formworks of main beam and junior beam are designed respectively.Supporting lattice is adopted and ceiling formwork is designed to ensure and control the key points in inspection, acceptance, safety protection and formwork frame dismantlement during erection of high and large formwork support.It is monitored in construction that the maximum integral deformation of the supporting system is 9 mm and it satisfies the requirements.%某工程内设游泳馆,游泳馆顶板、梁高大模架的搭设采用碗口式与扣件式组合形式的满堂式脚手架,属高大模架支撑体系,分别对主梁、次梁进行模板设计,运用套支格构形式,设计顶板模板,保证和控制高大模架搭设过程中的检查验收要点和安全防护要点以及模架拆除要点,经过施工监测,支撑系统在施工过程中整体变形最大值为9 mm,满足要求.

  7. 城市道路地下结构清水混凝土模板施工技术%Construction Technology for Formwork of Fair-faced Concrete of Underground Structures of Urban Roads

    Institute of Scientific and Technical Information of China (English)

    秦凯

    2012-01-01

    为总结地下结构工程清水混凝土模板施工技术,以无锡太湖大道节点改造工程SD3标为例,介绍无锡太湖大道节点改造工程结构施工的特点和要求,着重介绍清水混凝土模板的选型、设计、安装和拆除等关键技术。实践证明:1)在地下结构清水混凝土施工中,采用定型大钢模板与普通胶模板相结合的方式,能够达到预期的饰面设计效果;2)模板的设计和计算,符合规范要求,能够满足工程质量和安全要求,并且能兼顾经济适用性原则;3)模板的安装与控制是清水混凝土质量的关键施工步骤。%The type selection, design, installation and disassembling of the formwork of the fair-faced concrete of the underground structure of a project in Wuxi are presented. The practice shows that : 1 ) The surface decoration effect ex- pected can be realized by using set steel formwork combined with rubber formwork. 2) The design and calculation of the formwork meets the requirements of relevant standards and meets the quality and safety requirements of the project. The formwork adopted is economic and appropriate. 3 ) The installation and control of the formwork are key procedures to guarantee the quality of fair-faced concrete.

  8. 复合塑料模板在建筑中的应用现状及展望%Application status and prospect of composite plastic construction formwork in the construction

    Institute of Scientific and Technical Information of China (English)

    翟雁; 郭晓波

    2015-01-01

    综述了我国建筑模板的发展历程和使用概况.木质胶合模板、组合钢模板以及竹胶模板存在高能耗、高物耗、高污染等不同程度的弊端,复合塑料建筑模板不仅符合绿色施工的要求,也是节约资源的一项重要措施,更是我国建筑模板行业未来的发展趋势.通过分析复合塑料建筑模板的特点及优势,指出了复合塑料建筑模板在我国的发展空间巨大,发展复合塑料建筑模板具有重要意义.因此,复合塑料建筑模板的发展前景广阔,将成为模板行业今后发展的主要方向.%The development course and application of construction formwork in China was summarized. The wood veneer,combination steel template and bamboo plywood framework had the disadvantages of high energy consumption,high material consumption and high pollution. The composite plastic construction formwork not only met the requirements of green construction but saved the resources as well. It was the future development trend of construction formwork industry in China. The composite plastic construction formwork in China had great development space and significance through analyzing its characteris and advantages. Therefore,the composite plastic construction formwork has broad development prospect which will become the main direction of the formwork industry.

  9. Differences between participants and non-participants in an RCT on physical activity and psychological interventions for older persons

    NARCIS (Netherlands)

    van Heuvelen, MJG; Hochstenbach, JBM; Brouwer, WH; de Greef, MHG; Zijlstra, GAR; van Jaarsveld, E; Kempen, GIJM; van Sonderen, E; Ormel, J; Mulder, T

    2005-01-01

    Background and aims: Volunteer bias in intervention studies on successful aging has been poorly explored. This paper investigated differences between participants and non-participants of the Groningen Intervention Study on Successful Aging (GISSA) over a wide range of demographic, physical, psycholo

  10. Reasons for non-participation in a parental program concerning underage drinking: a mixed-method study

    Directory of Open Access Journals (Sweden)

    Eriksson Charli

    2009-12-01

    Full Text Available Abstract Background Alcohol consumption among adolescents is a serious public health concern. Research has shown that prevention programs targeting parents can help prevent underage drinking. The problem is that parental participation in these kinds of interventions is generally low. Therefore, the aim of the present study is to examine non-participation in a parental support program aiming to prevent underage alcohol drinking. The Health Belief Model has been used as a tool for the analysis. Methods To understand non-participation in a parental program a quasi-experimental mixed-method design was used. The participants in the study were invited to participate in a parental program targeting parents with children in school years 7-9. A questionnaire was sent home to the parents before the program started. Two follow-up surveys were also carried out. The inclusion criteria for the study were that the parents had answered the questionnaire in school year 7 and either of the questionnaires in the two subsequent school years (n = 455. Multinomial logistic regression analysis was used to examine reasons for non-participation. The final follow-up questionnaire included an opened-ended question about reasons for non-participation. A qualitative content analysis was carried out and the two largest categories were included in the third model of the multinomial logistic regression analysis. Results Educational level was the most important socio-demographic factor for predicting non-participation. Parents with a lower level of education were less likely to participate than those who were more educated. Factors associated with adolescents and alcohol did not seem to be of significant importance. Instead, program-related factors predicted non-participation, e.g. parents who did not perceive any need for the intervention and who did not attend the information meeting were more likely to be non-participants. Practical issues, like time demands, also seemed to

  11. 木工字梁在高大模板体系中的应用%Application of wooden I- beams in high and large formwork system

    Institute of Scientific and Technical Information of China (English)

    吴海章; 张奎

    2015-01-01

    木工字梁是国际通用的建筑模板体系中的重要部件,具有重量轻、刚度大、不易变形等特点,可多次周转使用且成本摊销费用低廉。文章研究分析了木工字梁的力学特性,介绍了木工字梁模板的拼装方法,结合港珠澳大桥岛隧工程东人工岛现浇隧道暗埋段结构施工实际,阐述了木工字梁在高大模板体系中的施工技术。特别适用于断面高度较大的混凝土结构。%Wooden I -beam is an important part of international general construction formwork system. It has the characteristics of light weight, high stiffness and is not easily deformed. Moreover, it can be used repeatedly and the cost is low. We studied the mechanical properties of wooden I-beam, introduced the method of assembling wooden I-beams formwork, and expounded the construction technology of the wooden I-beams in the high and large formwork system combined with structure construction of cast-in-situ buried section in the east island of the Hongkong-Zhuhai-Macao Bridge island &tunnel project. The technology is especially suitable for the concrete structure which has large section height.

  12. Set-shaped Steel Formwork of Tunnel Lining Trolley%隧道二衬台车端头定型钢模板

    Institute of Scientific and Technical Information of China (English)

    陈洋

    2014-01-01

    In order to improve the waterproof function of the lining of tunnel, in line with the principle of operation easy, high-speed construction, cost saving and waterproof, this paper decides to adopt the technology of set-shaped steel formwork of tunnel lining trol ey.%为了提高隧道衬砌的防水功能,本着操作简单、快速施工、节约成本、防水质量有保证的原则,决定采用隧道二衬台车端头定型钢模板技术进行施工。

  13. S32/900上行自行式移动模架施工工法%$32/900 uplink self- traveling movable formwork construction process

    Institute of Scientific and Technical Information of China (English)

    谢志军

    2011-01-01

    S32/900 uplink self-traveling movable formwork main girder systems, hanging from the ribs, shifting and locking mechanism, external formwork system, walked after supporting institutions do agencies, the main branch, legs, former assistant teams leg, the boom, hookon car, hangs aisle and 5-ton electric hoist, electric hydraulic system and the auxiliary facilities components. Movable formwork system construction not by topography limit beam, dont need large crane cooperate, occupy space is little, safely and quickly under the 24m and 32m, applies to low beam, pier has strong adaptability and construction at the end of the first cross and across more convenient ( not need dismantled, can satisfy the girder) obstacles such as ever the headroom requirement, high - voltage. Convenient, also girder system short demolished external formwork system can directly through the tunnel. Using this a legal beam safety fast, gained considerable economic and social benefits.%S32/900上行自行式移动模架主要由主梁系统、吊挂外肋、横移及锁定机构、外模系统、后走行机构、后支承机构、中主支腿、前辅助支腿、吊杆、起吊小车、吊挂走道及5t电葫芦、电气液压系统及辅助设施等部分组成。移动模架制梁施工不受地形限制,不需要大型吊车配合,占用桥下空间小,安全快速,24m和32m的简支梁均适用,对低矮桥墩具有很强的适应性,且施工首跨和末跨更方便(不需拆除主梁),能满足过高压线等障碍物的净空要求。主梁系统短距离转场方便,拆除外模系统可直接通过隧道。采用此支法制梁安全快速,取得了可观的经济和社会效益。

  14. Oscillating Permanent Magnets.

    Science.gov (United States)

    Michaelis, M. M.; Haines, C. M.

    1989-01-01

    Describes several ways to partially levitate permanent magnets. Computes field line geometries and oscillation frequencies. Provides several diagrams illustrating the mechanism of the oscillation. (YP)

  15. Recruitment and Reasons for Non-Participation in a Family-Coping-Orientated Palliative Home Care Trial (FamCope)

    DEFF Research Database (Denmark)

    Ammari, Anne Birgitte Hjuler; Hendriksen, Carsten; Rydahl-Hansen, Susan

    2015-01-01

    professionals. However, an unexpectedly high number of families declined participation in the trial. We describe and discuss the recruitment strategy and patient reported reasons for non-participation to add to the knowledge about what impedes recruitment and to identify the factors that influence willingness...... to participate in research aimed at family coping early in the palliative care trajectory. Patients with advanced cancer and their closest relative were recruited from medical, surgical, and oncological departments. Reasons for non-participation were registered and characteristics of participants and non...... to affect willingness to receive a family-coping-orientated care approach and impeded recruitment to this trial. Our findings can be used in further research and in clinical practice in order to construct interventions and target relevant populations for early family-coping-orientated palliative care....

  16. Fear of falling and self-perception of health in older participants and non-participants of physical activity programs

    Directory of Open Access Journals (Sweden)

    Carolina Kruleske da Silva

    2013-12-01

    Full Text Available Fear of falling, self-perception of health, and participation in physical activity programs have been associated with several variables related to health and performance in older adults. The purpose of this study was to evaluate self-perception of health and fear of falling in older adult participants and non-participants of physical activity programs, and to verify the relationship between these variables. A total of 40 healthy but sedentary older adults, and 45 physically active older adults were assessed through the Falls Efficacy Scale International-Brazil (FES-I and a questionnaire that measured their self-perception of health. The older adults that did not participate in regular physical activity programs presented higher scores of fear of falling, which, in turn, is associated with an increase of risk for falls. Moreover, older adults, participants in regular physical activity programs exhibited a more positive health perception than did the non-participants. Also, non-participants of physical activity programs perceived their health status as being poor or very poor as well as expressing great concern about falling compared to those who considered their health as excellent, good or regular. The results of this study have important implications for making clinical decisions in prevention or rehabilitation of older people, and they justify recommendations to the public health system.

  17. Design of Formwork Supporting System for Large Cantilever Concrete Structure%高空大悬挑混凝土结构模板支撑体系设计

    Institute of Scientific and Technical Information of China (English)

    厉明山; 王斌; 蒋开先

    2012-01-01

    Based on an exhibition center project, the authors introduced the selection of design scheme for formwork support and the design of formwork supporting system, including scheme design and establishment of computer model for the formwork supporting system. The authors analyze the formwork supporting technology with composite Bailey beam-fastened steel pipes. Compared with traditional construction technology, the new scheme can reduce the cost and shorten construction time. The new scheme also reduced the security risk, and obtained good effect.%结合某会展中心工程,详细介绍了模板支架设计方案的选择,模板支撑系统设计,包括方案设计和模板支撑系统计算模型的建立;深入分析了大悬挑现浇钢筋混凝土模板支架采用叠合贝雷梁-扣件式钢管满堂架组合支撑技术.这种技术与传统的施工工艺相比较,节约了施工成本,加快了施工进度,降低了安全风险,获得了良好的施工效益.

  18. CONSTRUCTION TECHNIQUE OF SUPER-HIGH HEAVY FORMWORK GROUP OF HANDAN CULTURE AND ARTS CENTER%邯郸文化艺术中心超高重型群体模架施工技术

    Institute of Scientific and Technical Information of China (English)

    刘京城; 白克利; 李辉坚; 王念念; 贾成亮

    2011-01-01

    The Handan Culture and Arts Center adopts high supporting frame, heavy structural load and complex structural section shape. Super-high heavy formwork group is adopted during construction, using many construction techniques, such as tool-type unilateral formwork supporting, cross-plate scaffold and bowl-buckle scaffold, etc. After contrastive analysis on the formwork support, it is indicated that cross -plate scaffold possesses higher safety in high load-bearing formwork supporting system above 20m.%邯郸文化艺术中心施工工程,支撑架高度大,结构荷载大,结构截面形状复杂.施工中采用了超高重型群体模架施工,该模架运用了工具式单侧支模、十字盘脚手架和碗扣式脚手架等产品施工技术.对模架进行对比分析,得出十字盘脚手架在20m以上,高大承重模架体系的应用更具安全性.

  19. 武汉天兴洲公铁两用桥主塔爬模设计及应用%Design and Application of Climbing Slipform Formwork in Pylon Tower of Wuhan Tianxingzhou Yangtze River Highway-railway Bridge

    Institute of Scientific and Technical Information of China (English)

    宁智刚

    2011-01-01

    武汉天兴洲公铁两用桥主塔模板施工采用液压自爬模体系,打破了传统的施工工艺,对施工环境、提高施工工效、安全环保等都有所改善.针对该工程主塔模板施工,施工脚手架采用液压自爬模系统配合木工字梁模板体系,并对爬模体系进行了优化和设计.此外,阐述了模板系统组成及液压自爬架组成,详细介绍了爬模施工方案以及安全规定.体现了液压自爬模及木梁胶合板模板体系用于异型混凝土结构的优越性.%Hydraulic climbing slipform system is used with main tower formwork construction of Wuhan Tianxingzhou Yangtze river highway-railway bridge, the traditional construction technology is changed. The construction environment, construction efficiency, safety and environmental protection is all improved. Based on the construction, construction scaffolding is used with hydraulic climbing slipform system combined with wood H beam formwork system, and auto-climbing formwork system is optimized and designed. In addition, formwork system composition and hydraulic climbing slipform system are expounded. Construction scheme of climbing slipform and safety regulations are introduced in detail. The fact shows that it is reasonable that hydraulic climbing slipform system and timber beam plywood formwork system are used in non-standard concrete structure.

  20. Permanences GAG-EPA

    CERN Multimedia

    GAC-EPA

    2015-01-01

    Le GAC organise chaque mois des permanences avec entretiens individuels. La prochaine permanence se tiendra le : Mardi 5 mai de 13 h 30 à 16 h 00 Salle de réunion de l’Association du personnel Les permanences suivantes auront lieu les mardis 2 juin, 1er septembre, 6 octobre, 3 novembre et 1er décembre 2015. Les permanences du Groupement des Anciens sont ouvertes aux bénéficiaires de la Caisse de pensions (y compris les conjoints survivants) et à tous ceux qui approchent de la retraite. Nous invitons vivement ces derniers à s’associer à notre groupement en se procurant, auprès de l’Association du personnel, les documents nécessaires.

  1. Factors associated with non-participation and drop-out in a lifestyle intervention for workers with an elevated risk of cardiovascular disease

    NARCIS (Netherlands)

    Groeneveld, I.F.; Proper, K.I.; Beek, A.J. van der; Hildebrandt, V.H.; Mechelen, W. van

    2009-01-01

    Background: Non-response and drop-out are problems that are commonly encountered in health promotion trials. Understanding the health-related characteristics of non-participants and drop-outs and the reasons for non-participation and drop-out may be beneficial for future intervention trials.

  2. Non-participation in breast cancer screening for persons with chronic diseases and multimorbidity: a population-based cohort study

    DEFF Research Database (Denmark)

    Andersen, Berit

    2015-01-01

    –96 %). Higher non-participation was also observed for women with severe multimorbidity (PR = 1.53, 95 % CI: 1.23–1.90) and mental-physical multimorbidity (PR = 1.54, 95 % CI: 1.36–1.75). Conclusion In conclusion, we found a strong association between non-participation in breast cancer screening for some chronic......-participation was found for women with cancer (PR = 1.50, 95 % CI: 1.40–1.60), mental illness (PR = 1.51, 95 % CI: 1.42–1.60), chronic obstructive pulmonary disease (PR = 1.51, 95 % CI: 1.42–1.62), neurological disorders (PR = 1.24, 95 % CI: 1.12–1.37) and kidney disease (PR = 1.70, 95 % CI 1.49–1.94), whereas women...

  3. 谈悬空钢梁平台支模筒仓顶板的施工%Discussion on the construction of suspended steel platform formwork silo roof

    Institute of Scientific and Technical Information of China (English)

    郝晓华

    2014-01-01

    结合工程实例,介绍了悬空支模浇筑筒仓顶板的施工工艺,并阐述了钢梁承重体系制作、安装、拆除的操作要点,同时对施工特点进行了总结,从而完善了仓顶支模施工方法,对类似项目施工有一定借鉴意义。%Combining with the engineering example,this paper introduced the construction technology of suspended branches casting silo roof, and elaborated the operation key points of making,installation,demolition of steel bearing system,at the same time summarized the construction characteristics,in order to improve the construction method of silo roof formwork,had certain reference significance to similar project construction.

  4. The Construction Technology of Fast and Standardized Formwork%快速、标准化支模架施工技术

    Institute of Scientific and Technical Information of China (English)

    金学胜; 宋千军; 黎争

    2014-01-01

    支模架施工技术的标准化构件可以动态调节楼板标高,保证施工质量。另外,其承擦式连接又节省了大量的钢管、扣件,减少了材料的损耗,节约了人工及工期。%The standardized component of formwork constr-uction technology can dynamicaly adjust the floor elevation and ensure the quality of construction. And the eraser type connection saves a lot of steel tube and fastener, reduces the material consumption and saves the manpower and time.

  5. Factors associated with non-participation and drop-out in a lifestyle intervention for workers with an elevated risk of cardiovascular disease.

    Science.gov (United States)

    Groeneveld, Iris F; Proper, Karin I; van der Beek, Allard J; Hildebrandt, Vincent H; van Mechelen, Willem

    2009-12-01

    Non-response and drop-out are problems that are commonly encountered in health promotion trials. Understanding the health-related characteristics of non-participants and drop-outs and the reasons for non-participation and drop-out may be beneficial for future intervention trials. Male construction workers with an elevated risk of cardiovascular disease (CVD) were invited to participate in a lifestyle intervention study. In order to investigate the associations between participation and CVD risk factors, and drop-out and CVD risk factors, crude and multiple logistic regression analyses were performed. The reasons for non-participation and drop-out were assessed qualitatively. 20% of the workers who were invited decided to participate; 8.6% of the participants dropped out before the first follow-up measurement. The main reasons for non-participation were 'no interest', 'current (para-)medical treatment', and 'feeling healthy', and for drop-out they were 'lack of motivation', 'current (para-)medical treatment', and 'disappointment'. Participants were 4.2 years older, had a higher blood pressure, higher total cholesterol, and lower HDL cholesterol than non-participants, and were more likely to report 'tiredness and/or stress' and 'chest pain and/or shortness of breath'. After adjusting for age, most risk factors were not significantly associated with participation. Drop-outs were 4.6 years younger than those who completed the study. The prevalence of smoking was higher among non-participants and drop-outs. Participants had a worse CVD risk profile than non-participants, mainly because of the difference in age. Non-participants and drop-outs were younger and more likely to be smokers. The main reasons for non-participation and drop-out were health-related. Investigators in the field of health promotion should be encouraged to share comparable information. Current Controlled Trials ISRCTN60545588.

  6. Odico Formwork Robotics

    DEFF Research Database (Denmark)

    Søndergaard, Asbjørn

    2014-01-01

    In the next decade or so, the widespread adoption of robotics is set to transform the construction industry: building techniques will become increasingly automated both on– and off–site, dispensing with manual labour and enabling greater cost and operational efficiencies. What unique opportunities......, however, does robotics afford beyond operational effectiveness explicitly for the practice of architecture? What is the potential for the serial production of non–standard elements as well as for varied construction processes? In order to scale up and advance the application of robotics, for both...

  7. Comparison of participants and non-participants in a randomized study of prevention of depression in patients with acute coronary syndrome

    DEFF Research Database (Denmark)

    Hansen, Baiba; Hanash, Jamal A.; Rasmussen, Alice;

    2011-01-01

    Care Evaluation of Mental Disorders (PRIME-MD) screening questionnaire. Results: The PRIME-MD screening data were available on 232 patients (76.8% of eligible patients). Thirty-eight (35.5%) of 107 participants and 30 (24.0%) of 125 non-participants had a positive screening for depression (NS), and 47...... (43.9%) participants and 55 (44%) non-participants were screened positive for anxiety (NS). Non-participants were older (P=0.002), while no significant differences in gender or cardiac diagnosis were found. Conclusions: Symptoms of depression and anxiety were highly prevalent in patients after ACS...

  8. Allergy in bakers' apprentices and factors associated to non-participation in a cohort study of allergic sensitization

    DEFF Research Database (Denmark)

    Skjold, Tina; Nielsen, Sven C; Adolf, Katja;

    2006-01-01

    Objective  To describe the prevalence of atopy and respiratory symptoms among baker apprentices at the start of the education and factors associated with non-participation in the study. Methods  A total of 346 students, 22.1(0.6) years of age, mean (SD), from the food production programme...... of technical colleges in Denmark were invited to participate in a 3 year study. Of the students, 187 agreed to participate and filled in a physician-administered questionnaire. The presence of atopy was determined by skin prick test (SPT) and serum allergen specific IgE (SpIgE). Bronchial hyper responsiveness...

  9. Socioeconomic differences in smoking in an urban Swedish population. The bias introduced by non-participation in a mailed questionnaire

    DEFF Research Database (Denmark)

    Boström, G; Hallqvist, J; Haglund, B J

    1993-01-01

    a higher prevalence of daily smoking in all sub-groups. This effect of the efforts to reduce non-participation differed socially. The prevalence of smoking for men, 40-64 years of age, who were reached by telephone was 60.3%. Male professionals and intermediate non-manual workers, 40-64 years of age...... reached by telephone had a prevalence of smoking, which was twice as high as for the responders of the questionnaire (62.5 and 26.8%, respectively). In the younger age-group, non-responders had the same socioeconomic pattern in smoking as the responders. Independent of socioeconomic group......Stockholm Health of the Population Study is a cross-sectional study carried out from 1984-85. Postal questionnaires, telephone interviews and health interviews were used to get information from a sample of 5,199 persons, 18-64 years of age, on health status, risk exposures, healthcare consumption...

  10. 铁路客专隧道简易仰拱移动模架施工技术%Technology for Casting of Inverts of Tunnels on Passenger-dedicated Railways by means of Smiple Movable Formwork Trolleys

    Institute of Scientific and Technical Information of China (English)

    冯国春; 邓志刚

    2011-01-01

    A simple movable formwork trolley is designed for the casting of the inverts of tunnels on passenger-dedicated railways, on basis of summarizing the conventional invert construction technologies, so as to speed up the construction and reduce the construction cost, with the construction of the invert of the entrance section of Dazhai tunnel on GuiyangGuangzhou Railway as an example. The construction of the tunnels on the high-standard passenger-dedicated railways can be effectively improved due to the application of the simple movable formwork trolleys. The practice shows that the simple movable invert formwork trolleys are superior to the conventional formwork trolleys and have resulted in rapid construction and good economic benefits.%为加快施工进度,节约成本,在总结常规隧道仰拱施工技术的基础上,设计出一套简易仰拱移动模架装置,并以贵广铁路大寨隧道进口的仰拱施工为例,探讨采取简易仰拱移动模架快速、高效地服务于高标准铁路客运专线隧道施工.经实践证明,使用简易仰拱移动模架施工比常规方法更优越、合理、快速,并且带来了巨大的经济效益.

  11. Technology for Assembling of New Type of Lining Formwork Trolley in Tunnel%新型无骨架隧道衬砌模板台车洞内安装方法

    Institute of Scientific and Technical Information of China (English)

    邢泊; 姚宇

    2011-01-01

    In the construction of long tunnels,the air flow at the working face is blocked by the lining formwork trolley,which results in poor working environment.Therefore,new type of lining formwork trolley is developed to improve the working environment.The structure,assembling requirements,labor organization,assistant equipment and assembling procedure of the new type of lining formwork trolley are presented,with the case of the exit section of Funing tunnel on Kunming-Nanning railway as an example.The assembling practice demonstrates that the assembling method described is efficient,time-saving and flexible and can completely meet the tunneling requirements.The application of the new type of lining formwork trolley can greatly improve the ventilation effects of the tunnel.%在长大隧道施工过程中,二次衬砌模板台车净空小,空气流通不畅,影响了施工人员工作环境。为改善工人工作环境,以云桂铁路富宁隧道出口段为例,介绍大净空新型无骨架隧道衬砌模板台车,主要包括新型模板台车主体结构、安装边界条件、劳动力组织、辅助设备及新型模板台车的安装步骤等。经施工生产证明:该安装方法效率高、耗时短、可操作性强,完全满足施工进度,同时该设备的应用大大改善了隧道通风环境。

  12. 土模回填泵送混凝土技术在隧道塌方处理中的应用%Application of Pumping Concrete with Soil Formwork in Tunnel Collapse Treatment

    Institute of Scientific and Technical Information of China (English)

    张立忠; 周海亮

    2011-01-01

    Due to different geological and hydrological conditions, surrounding rock grades and construction, the tunnel always collapse during construction. The main causes including improper construction method, untimely collapse treatment and geological structure. The minor collapse can be treated with principle of mainly clearing, enhancing the supporting, filling materials and compacting, as well as carefully constructing. However the large-scale collapse should be treated with pipe shed, grouting or pumping concrete with soil formwork. The principle and construction process of pumping concrete with soil formwork are introduced. The method of filled soil formwork and pumping concrete need less worker and equipments, and the operations is simpler than pipe shed method. Moreover, good treatment effect can be reached with the pumping concrete with soil formwork method.%隧道施工过程中由于地质水文条件、围岩等级、施工等各方面原因,经常会出现塌方现象,塌方处理是隧道施工不可回避的问题.导致隧道塌方的原因主要有施工方法不当、处理不及时、地质构造等.指出小塌方可遵循“以清为主、加强支护、回填密实、谨慎施工”的原则.而大塌方需要采用管棚法、注浆法或土模回填泵送混凝土法.指出了土模回填泵送混凝土处理塌方的原理和具体施工步骤.与管棚法相比,土模回填泵送混凝土法需要人员及机械少,操作简单,效果良好.

  13. Application of full-face needle-beam steel formwork in the concrete lining of tunnel%小浪底工程明流洞气减蚀设计研究

    Institute of Scientific and Technical Information of China (English)

    朱春英; 凌霄; 刘杰; 李刚

    2001-01-01

    小浪底枢纽明流洞水头高、流速大,存在空蚀的可能性。为了减免空蚀对建筑物的危害,根据类似工程的经验,结合小浪底工程明流洞的具体情况, 采用了掺气减蚀措施。设计过程中对掺气坎的形式、布置、保护长度等进行了充分的论证,取得了很好的效果%The sections of No.3 and No.4 tunnels for intake head of Water Diversion Project From Yellow River To Shanxi Province are designed as circular section. Its excavation diameter is 6.4 m and the actual diameter after lining is 5.6 m. The total length of No.3 tunnel is 758.3 m, constructed by the steel formwork jack plane. The total length of No.4 tunnel is 1700 m, constructed by full-face needle-beam steel formwork. Analyzed and compared the concrete construction of such two tunnels, it is considered that the full-face needle-beam steel formwork construction has the advantages of low disturbance, good concrete appearance, high utilization rate of resources and labors, low investment and high progress. But its lump-sum investment is much larger than that of steel formwork jack plane, so that it is suitable to the concrete lining of long and fixed-section tunnel.

  14. 我国建筑铝模板产业的崛起对绿色施工的推动作用%Promoting Role of Aluminum Formwork Industry Rising for Green Construction in China

    Institute of Scientific and Technical Information of China (English)

    仇铭华

    2012-01-01

    Following the guide of green construction, by analyzing and comparing the material properties, manufacture, cost and effect of aluminum formwork with wood (bamboo) plywood and steel formwork widely used in construction, it can be concluded that the aluminum formwork is a turnaround of more than 300 times. It has a higher residual value. It is reusable and green material of environment protection. It has extremely important position in the green construction. Through extensive application status abroad and domestic gradual trends, it can be predicted that the aluminum formwork construction projects will have a greater growth in the future, especially in high-rise building construction projects, and it will have widely promote application.%遵循《绿色施工导则》,通过对建筑铝模板与建筑工程中广泛采用的木(竹)胶合板模板和钢模板的材料性能、制造和应用成本,以及应用效果的分析对比,得出结论:建筑铝模板是一种可周转使用300次以上、有较高残值、可再生使用的低耗、环保、经济实用的绿色建材,在绿色建筑施工中有极其重要的地位.根据国外广泛应用状况和国内逐渐增长的应用趋势,可以预测建筑铝模板在我国今后的建筑工程中将会有较大增长,特别是在超高层建筑施工工程中,更会得到普遍的推广应用.

  15. On primary installation of self climbing hydraulic climbing formwork and climbing construction technique%自爬升式液压爬模初始安装及爬升施工技术

    Institute of Scientific and Technical Information of China (English)

    薛万凯

    2012-01-01

    以广州某超高层自爬升式液压爬模施工为例,对自爬升式液压爬模初始安装及爬升施工技术进行了阐述,指出自爬升式液压爬模在超高层建筑混凝土浇筑过程中对提高施工质量、进度、效益等方面都有显著的成效,对类似工程施工有一定的指导意义。%Taking some super-high-rise self climbing hydraulic climbing formwork construction in Guangzhou as the example, the paper illustrates the primary installation of self climbing hydraulic climbing formwork and the climbing construction technique, and points out the primary installation of self climbing hydraulic climbing formwork can have obvious effect on promoting the construction quality, the progress, and benefits and other aspects in the grouting process of the super-high-rise buildings, so it has certain direction significance for the similar construction.

  16. Automatic Monitoring System in High Formwork Monitoring of Construction Engineering%自动监测系统在建筑工程高支模监测中的应用

    Institute of Scientific and Technical Information of China (English)

    赖仁纯

    2015-01-01

    High formwork system of building project has high-risk, complex, accidents unexpected features. This article describes the application example about the automatic monitoring system in high formwork system of the con-struction safety monitoring of construction engineering, specifically addressed the monitoring of content, measuring points, analysis and evaluation of monitoring results. It provides construction safety for high formwork stability mon-itoring, implementation of dynamic design, dynamic construction.%建筑物高支模工程具有高危性、复杂性、事故突发性的特点,本文介绍了自动监测系统在建筑工程高支模施工过程进行安全监控的应用实例,具体阐述了监测内容、测点布置及监测结果分析与评价,为高支模工程进行稳定性监测,实施动态设计、动态施工、安全施工提供了依据。

  17. Permanent magnet design methodology

    Science.gov (United States)

    Leupold, Herbert A.

    1991-01-01

    Design techniques developed for the exploitation of high energy magnetically rigid materials such as Sm-Co and Nd-Fe-B have resulted in a revolution in kind rather than in degree in the design of a variety of electron guidance structures for ballistic and aerospace applications. Salient examples are listed. Several prototype models were developed. These structures are discussed in some detail: permanent magnet solenoids, transverse field sources, periodic structures, and very high field structures.

  18. Lawful Permanent Residents - Annual Report

    Data.gov (United States)

    Department of Homeland Security — A lawful permanent resident (LPR) or 'green card' recipient is defined by immigration law as a person who has been granted lawful permanent residence in the United...

  19. 自行式边墙模板台车的研制及在地铁结构工程中的应用%Development and Application of Self-propelled Sidewall Formwork Trolley in Construction of Metro Structures

    Institute of Scientific and Technical Information of China (English)

    黄昌建

    2012-01-01

    For the sake of the application of the self-propelled sidewall formwork trolley, accurate and rapid construction of Metro structures can be realized, the construction efficiency of the sidewalls can be improved and the quality of the Metro structures can be guaranteed. In the paper, detailed study is made on the components, design principle, stress calctilation and operation of the self-propelled sidewall formwork trolley. Conclusions drawn are as follows: 1 ) Due to the application of the sidewall formwork trolley, timely and effective concrete curing is achieved, which minimizes the shrinkage cracks and water seeping points ; 2) Due to the application of the sidewall formwork trolley, the quality of the sidewall is improved; 3 ) The sidewall formwork trolley discussed is easy in operation and maintenance.%自行式边墙模板台车能够实现在标准断面的地铁车站结构中的精确快速化施工,可大大提高结构边墙施工效率,同时可以保证工程结构的各方面质量。着重对自行式边墙模板台车的组成、设计原理、受力计算及施工操作等几方面进行深入研究。采用自行式边墙模板台车施工达到了预期的目标:1)养护及时且效果好,大大降低了收缩裂缝的产生,减少渗漏点;2)浇筑完成的结构边墙外观质量好,平整度高,无蜂窝麻面、气泡及孔洞等现象;3)操作快捷、方便,便于维修及保养。

  20. Permanence can be Defended.

    Science.gov (United States)

    McGee, Andrew; Gardiner, Dale

    2017-03-01

    In donation after the circulatory-respiratory determination of death (DCDD), the dead donor rule requires that the donor be dead before organ procurement can proceed. Under the relevant limb of the Uniform Determination of Death Act 1981 (USA), a person is dead when the cessation of circulatory-respiratory function is 'irreversible'. Critics of current practice in DCDD have argued that the donor is not dead at the time organs are procured, and so the procurement of organs from these donors violates the dead donor rule. We offer a new argument here in defence of current DCDD practice, and, in particular, of the interpretation of the requirement of 'irreversibility' as permanence.

  1. Pulsars: Cosmic Permanent 'Neutromagnets'?

    CERN Document Server

    Hansson, Johan

    2011-01-01

    We argue that pulsars may be spin-polarized neutron stars, i.e. cosmic permanent magnets. This would simply explain several observational facts about pulsars, including the 'beacon effect' itself i.e. the static/stable misalignment of rotational and magnetic axes, the extreme temporal stability of the pulses and the existence of an upper limit for the magnetic field strength - coinciding with the one observed in "magnetars". Although our model admittedly is speculative, this latter fact seems to us unlikely to be pure coincidence.

  2. Controversies about cervical cancer screening: A qualitative study of Roma women's (non)participation in cervical cancer screening in Romania.

    Science.gov (United States)

    Andreassen, Trude; Weiderpass, Elisabete; Nicula, Florian; Suteu, Ofelia; Itu, Andreea; Bumbu, Minodora; Tincu, Aida; Ursin, Giske; Moen, Kåre

    2017-06-01

    Romania has Europe's highest incidence and mortality of cervical cancer. While a free national cervical cancer-screening programme has been in operation since 2012, participation in the programme is low, particularly in minority populations. The aim of this study was to explore Roma women's (non)participation in the programme from women's own perspectives and those of healthcare providers and policy makers. We carried out fieldwork for a period of 125 days in 2015/16 involving 144 study participants in Cluj and Bucharest counties. Fieldwork entailed participant observation, qualitative interviewing and focus group discussions. A striking finding was that screening providers and Roma women had highly different takes on the national screening programme. We identified four fundamental questions about which there was considerable disagreement between them: whether a free national screening programme existed in the first place, whether Roma women were meant to be included in the programme if it did, whether Roma women wanted to take part in screening, and to what degree screening participation would really benefit women's health. On the background of insights from actor-network theory, the article discusses to what degree the programme could be said to speak to the interest of its intended Roma public, and considers the controversies in light of the literature on patient centred care and user involvement in health care. The paper contributes to the understanding of the health and health-related circumstances of the largest minority in Europe. It also problematizes the use of the concept of "barriers" in research into participation in cancer screening, and exemplifies how user involvement can potentially help transform and improve screening programmes. Copyright © 2017 The Authors. Published by Elsevier Ltd.. All rights reserved.

  3. Main points for design and construction in formwork of caisson type dock gate%坞门式沉箱模板设计及施工要点

    Institute of Scientific and Technical Information of China (English)

    黄文慧; 董政

    2015-01-01

    Caisson type dock gate is an important part of the immersed tunnel precast yard. Its size is 59 m×25.2 m×29.1 m. Although the construction of caisson is very common in hydraulic industry, the construction of large-scale caisson in need of floating transportation has its characteristics. Starting with the design and construction in formwork of large-scale caisson type dock gate, which is in the immersed tube prefabricated factory of the Hongkong-Zhuhai-Macao Bridge, we discussed some parts which in need of particular attention to. The beneficial experiences are obtained.%沉箱结构的坞门在沉管隧道预制场中是重要的构件,其尺寸达到了59 m ×25.2 m ×29.1 m。虽然沉箱施工在水工行业已较为普遍,但大型化需浮运的沉箱施工有其特点。从港珠澳大桥沉管预制厂大型化沉箱模板的设计和施工入手,对特别需要注意的方面进行探讨,得到一些有益的经验。

  4. Research and Application of Fire Resisting Building External Insulation Formwork Technology%防火建筑外保温模板技术研究

    Institute of Scientific and Technical Information of China (English)

    姚通稳

    2016-01-01

    Under the requirements of insulation outside the building and fire protection performance, combined with the characteristics of existing external insulation system and insulation materials, a new kind of insulation material, namely fire resisting building external insulation formwork was designed. Through the detection and analysis on the slurry fluidity of fire isolation component, the compressive and flexural strength and wet density, the suitable mix proportion was chosen. By the comprehensive analysis on insulation and construction performance, it is pointed out that this component can meet wall concrete pouring and building energy-saving requirement.%在建筑物外保温系统防火性能要求下,结合现有外保温系统和保温材料特点,设计出一种新型保温材料——防火建筑外保温模板.通过对防火隔离设计部件料浆流动性、试件抗折、抗压强度和湿密度进行检测及数据分析,确定生产配料方案;对由企业生产并自然养护28d保温模板进行保温与施工性能综合分析,该制品满足墙体混凝土浇筑的施工与建筑物节能要求.

  5. HIGH FORMWORK CONSTRUCTION TECHNIQUE OF WIDE-SPAN CROSS BEAM ROOF%大跨度井格梁屋盖高支模施工技术

    Institute of Scientific and Technical Information of China (English)

    陈钧颐; 洪启明; 陈腾

    2011-01-01

    南京造币厂行业备件中心立体仓库高跨井格梁屋盖工程,按照制订的高跨扣件式落地钢管排架满堂支撑专项施工方案施工,上部井格梁屋盖混凝土一次性浇筑完毕,排架支撑模板按规定拆除,施工中未发生安全事故,经专家组的检查和最终验收,排架整体稳定可靠,符合设计及规范要求,为今后施工同类型结构工程积累了经验.%The high span cross beam roof engineering of Stereoscopic Warehouse of Industry Spare Parts Center of Nanjing Mint Co., Ltd. Is carried out according to the special construction scheme of supporting by full-house high span fastener type ground steel pipe frame bent. One-off concrete pouring is adopted for top cross beam roof and the frame supporting formworks are dismantled in accordance with the provisions. No safety accident happened during the construction. After inspection and final acceptance by the expert group, the frame bent is stable and reliable, satisfying the design requirements and the requirements of codes. Experiences are accumulated for construction of similar structural works in the future.

  6. Comparison of Characteristics and Outcomes of Trial Participants and Non-participants: Example of Blood and Marrow Transplant Clinical Trials Network (BMT-CTN) 0201 Trial

    Science.gov (United States)

    Khera, Nandita; Majhail, Navneet S.; Brazauskas, Ruta; Wang, Zhiwei; He, Naya; Aljurf, Mahmoud D.; Akpek, Görgün; Atsuta, Yoshiko; Beattie, Sara; Bredeson, Christopher N.; Burns, Linda J.; Dalal, Jignesh D.; Freytes, César O.; Gupta, Vikas; Inamoto, Yoshihiro; Lazarus, Hillard M.; LeMaistre, Charles F.; Steinberg, Amir; Szwajcer, David; Wingard, John R.; Wirk, Baldeep; Wood, William A.; Joffe, Steven; Hahn, Theresa E.; Loberiza, Fausto R.; Anasetti, Claudio; Horowitz, Mary M.; Lee, Stephanie J.

    2015-01-01

    BACKGROUND Controversy surrounds the question of whether clinical trial participants have better outcomes than comparable patients who are not treated on a trial. We explored this question using a recent large, randomized, multi-center study comparing peripheral blood (PB) with bone marrow (BM) transplantation from unrelated donors (URD), conducted by the Blood and Marrow Transplant Clinical Trials Network (BMT CTN). METHODS AND FINDINGS We compared characteristics and outcomes of study participants (n=494) and non-participants (n=1384) who appeared eligible and received similar treatment without enrolling on the BMT CTN trial at participating centers during the study time-period. Data were obtained from the Center for International Blood and Marrow Transplant Research. Outcomes were compared between the two groups using Cox proportional hazards regression models. No significant differences in age, sex and disease distribution, race/ ethnicity, HLA matching, comorbidities and interval from diagnosis to HCT were seen between the participants and non-participants. Non-participants were more likely to have lower performance status, lower-risk disease, and older donors, and to receive myeloablative conditioning and anti-thymocyte globulin. Non-participants were also more likely to receive PB grafts, the intervention tested in the trial (66% vs. 50% ptransplant-related mortality, and incidences of acute or chronic GVHD were comparable between the two groups though relapse was higher (HR 1.22, 95% CI 1.02–1.46, p=0.028) in non-participants. CONCLUSION Despite differences in certain baseline characteristics, survival was comparable between study participants and non-participants. The results of the BMT CTN trial appear generalizable to the population of trial-eligible patients. PMID:26071866

  7. Randomized intervention trial on preventive home visits to older people: baseline and follow-up characteristics of participants and non-participants

    DEFF Research Database (Denmark)

    Vass, Mikkel; Avlund, Kirsten; Hendriksen, Carsten

    2007-01-01

    of municipality employees) was done at municipality level. In total 5,788 home-dwelling 75- and 80-year-olds living in these municipalities were invited to participate in the study. Written consent was obtained from 4,060 persons (participation rate 71%). RESULTS: During five-year follow-up non-participants had...

  8. Permanent deformation of asphalt mixes

    NARCIS (Netherlands)

    Muraya, P.M.

    2007-01-01

    This dissertation describes the results of a research that was conducted on the permanent deformation of asphalt mixtures. Central to this research was the separate characterization of the contribution of the aggregate skeleton and the bituminous mortar towards resistance to permanent deformation. T

  9. Permanent-Magnet Meissner Bearing

    Science.gov (United States)

    Robertson, Glen A.

    1994-01-01

    Permanent-magnet meissner bearing features inherently stable, self-centering conical configuration. Bearing made stiffer or less stiff by selection of magnets, springs, and spring adjustments. Cylindrical permanent magnets with axial magnetization stacked coaxially on rotor with alternating polarity. Typically, rare-earth magnets used. Magnets machined and fitted together to form conical outer surface.

  10. Study of Organic Prestressing Technique in Overseas Long-Span Movable Formwork and Its Application%有机预应力技术在国外大跨度移动模架中的研究与应用

    Institute of Scientific and Technical Information of China (English)

    刘宏刚

    2015-01-01

    Movable Formwork is mainly used for the construction of medium and small span bridges.The status quo of the study and engineering examples of the organic prestressing tech-nique at home and abroad are analyzed and compared ,with the focus on introducing the relevant research and application condition abroad.The technique is the one that draws upon the muscle control theory in biology and the research achievements in automatic control domain to upgrade and improve the external prestressing technique.With the aid of sensors and control devices ,the stress level and elongation amount of prestressing tendons can be automatically adjusted according to the load variation ;therefore ,it can reduce the structural deformation of the movable formwork and minimize the pre-tensioning force.To make the most of the advantages of organic prestress-ing ,some foreign enterprises have added new structural forms ,light specialist devices and timber formwork system in the movable formwork design.The integrated application of these measures makes the economic span length accruing to 70~90 m ,and obtain sound application effect in ac-tual projects.%移动模架主要用于中小跨度桥梁施工 ,对国内外的研究进展及工程案例进行分析比较 ,重点介绍国外有机预应力技术的研究和应用情况.该技术利用生物学中的肌肉控制原理及自动化控制领域的研究成果对体外预应力技术进行改进和完善 ,使其能够在传感器和控制设备的帮助下 ,根据荷载变化自动调整缆索应力水平及伸长量 ,因而能够减少移动模架结构变形并使预拉力最小化.为充分发挥有机预应力的优势 ,国外企业在移动模架设计中采用了新的结构形式、轻型化的专用设备及木质模板系统 ,这些措施的综合运用使移动模架的经济跨度增大到70~90 m ,并在工程实践中取得良好效果.

  11. The "Permanent" Patient Problem.

    Science.gov (United States)

    Bruce, Courtenay R; Majumder, Mary A

    2014-01-01

    Patients who enter the health care system for acute care may become "permanent" patients of the hospital when a lack of resources precludes discharge to the next level of post-acute care. Legal, professional, and ethical norms prohibit physician and acute care hospital "dumping" of these patients. However, limitless use of hospital resources for indefinite stays is untenable. In the absence of hospital policy addressing this specific issue, the availability of financial support will be determined by health care professionals' willingness to advocate for the patient and negotiate with hospital administrators and the ability and willingness of administrators to authorize the use of hospital resources. We propose five mid-level ethical principles to guide advocacy and administrative decision-making about provision of financial support for post-acute care for those patients who cannot afford it. We use two actual, de-identified cases to illustrate how these principles can be used to make reasoned, consistent decisions about the provision of post-acute financial support.

  12. Comparison of early-, late-, and non-participants in a school-based asthma management program for urban high school students

    Directory of Open Access Journals (Sweden)

    Alexander Gwen

    2011-06-01

    Full Text Available Abstract Background To assess bias and generalizability of results in randomized controlled trials (RCT, investigators compare participants to non-participants or early- to late-participants. Comparisons can also inform the recruitment approach, especially when working with challenging populations, such as urban adolescents. In this paper, we describe characteristics by participant status of urban teens eligible to participate in a RCT of a school-based, web-based asthma management program. Methods The denominator for this analysis was all students found to be eligible to participate in the RCT. Data were analyzed for participants and non-participants of the RCT, as well as for students that enrolled during the initially scheduled recruitment period (early-participants and persons that delayed enrollment until the following fall when recruitment was re-opened to increase sample size (late-participants. Full Time Equivalents (FTEs of staff associated with recruitment were estimated. Results Of 1668 teens eligible for the RCT, 386 enrolled early, and 36 enrolled late, leaving 1246 non-participants. Participants were younger (p Conclusions Recruitment messages attracted youth with moderate-to-severe asthma, but extending enrollment was costly, resulting in potentially less motivated, and certainly less compliant, participants. Investigators must balance internal versus external validity in the decision to extend recruitment. Gains in sample size and external validity may be offset by the cost of additional staff time and the threat to internal validity caused by lower participant follow-up. Trial Registration ClinicalTrials.gov: NCT00201058

  13. Qualitative permanence of Lotka-Volterra equations.

    Science.gov (United States)

    Hofbauer, Josef; Kon, Ryusuke; Saito, Yasuhisa

    2008-12-01

    In this paper, we consider permanence of Lotka-Volterra equations. We investigate the sign structure of the interaction matrix that guarantees the permanence of a Lotka-Volterra equation whenever it has a positive equilibrium point. An interaction matrix with this property is said to be qualitatively permanent. Our results provide both necessary and sufficient conditions for qualitative permanence.

  14. Transient or permanent fisheye views

    DEFF Research Database (Denmark)

    Jakobsen, Mikkel Rønne; Hornbæk, Kasper

    2012-01-01

    , about the benefits and limitations of transient visualizations. We describe an experiment that compares the usability of a fisheye view that participants could call up temporarily, a permanent fisheye view, and a linear view: all interfaces gave access to source code in the editor of a widespread......Transient use of information visualization may support specific tasks without permanently changing the user interface. Transient visualizations provide immediate and transient use of information visualization close to and in the context of the user’s focus of attention. Little is known, however...... programming environment. Fourteen participants performed varied tasks involving navigation and understanding of source code. Participants used the three interfaces for between four and six hours in all. Time and accuracy measures were inconclusive, but subjective data showed a preference for the permanent...

  15. Lodestone: Nature's own permanent magnet

    Science.gov (United States)

    Wasilewski, P.

    1976-01-01

    Magnetic hysteresis and microstructural details are presented which explain why the class of magnetic iron ores defined as proto-lodestones, can behave as permanent magnets, i.e. lodestones. Certain of these proto-lodestones which are not permanent magnets can be made into permanent magnets by charging in a field greater than 1000 oersted. This fact, other experimental observations, and field evidence from antiquity and the middle ages, which seems to indicate that lodestones are found as localized patches within massive ore bodies, suggests that lightning might be responsible for the charging of lodestones. The large remanent magnetization, high values of coercive force, and good time stability for the remanent magnetization are all characteristics of proto-lodestone iron ores which behave magnetically as fine scale ( 10 micrometer) intergrowths when subjected to magnetic hysteresis analysis. The magnetic results are easily understood by analysis of the complex proto lodestone microstructural patterns observable at the micrometer scale and less.

  16. Topology optimized permanent magnet systems

    CERN Document Server

    Bjørk, R; Insinga, A R

    2016-01-01

    Topology optimization of permanent magnet systems consisting of permanent magnets, high permeability iron and air is presented. An implementation of topology optimization for magnetostatics is discussed and three examples are considered. First, the Halbach cylinder is topology optimized with iron and an increase of 15% in magnetic efficiency is shown, albeit with an increase of 3.8 pp. in field inhomogeneity - a value compared to the inhomogeneity in a 16 segmented Halbach cylinder. Following this a topology optimized structure to concentrate a homogeneous field is shown to increase the magnitude of the field by 111% for the chosen dimensions. Finally, a permanent magnet with alternating high and low field regions is considered. Here a $\\Lambda_\\mathrm{cool}$ figure of merit of 0.472 is reached, which is an increase of 100% compared to a previous optimized design.

  17. Connecting Temporary and Permanent Organizing

    DEFF Research Database (Denmark)

    Stjerne, Iben Sandal; Velikova, Silviya Svejenova

    2016-01-01

    This paper investigates the relationship between a permanent organization and a series of temporary organizations. It draws on an in-depth study of the process through which a Danish film production company, seeking to balance innovation and persistence in a troubled industry, struggles to realize...... a novel children’s film and its sequels. The study reveals tensions at different levels as well as boundary work and boundary roles that address them, bringing in shadows of past and future projects. The study extends the understanding of the dialectic between temporary and permanent organizing...... by emphasizing how ongoing work at different boundaries affects the permanent and temporary organizing’s connectedness and outcomes. It also challenges the overly bracketed view of temporary organizations, suggesting a temporality perspective on temporariness....

  18. Electromagnetic acceleration of permanent magnets

    CERN Document Server

    Dolya, S N

    2015-01-01

    We consider the acceleration of the permanent magnets, consisting of neodymium iron boron by means of the running magnetic field gradient. It is shown that the specific magnetic moment per nucleon in neodymium iron boron is determined by the remained magnetization of the substance. The maximum accessable gradient of the magnetic field accelerating the permanent magnets is determined by the coercive force thirty kilogauss. For the neodymium iron boron magnets this gradient is equal to twenty kilogauss divided by one centimeter. The finite velocity of the magnets six kilometers per second, the length of acceleration is six hundred thirty-seven meters.

  19. Early eruption of permanent canines.

    Science.gov (United States)

    Madhu, S

    2012-01-01

    Systemic and local factors can modify the eruption time of teeth. Generalized eruption time changes could be due to some systemic diseases like hyperthyroidism, hypophosphatasia, precocious puberty, Proteus syndrome, etc. Localized early eruption of permanent teeth could be due to early extraction of deciduous teeth. Presented here is an extremely rare case of early eruption of permanent canines in a 7-year old female child. Though the number of such cases is very limited, the clinician should poses adequate knowledge and keeps an open eye to identify such cases.

  20. Early eruption of permanent canines

    Directory of Open Access Journals (Sweden)

    S Madhu

    2012-01-01

    Full Text Available Systemic and local factors can modify the eruption time of teeth. Generalized eruption time changes could be due to some systemic diseases like hyperthyroidism, hypophosphatasia, precocious puberty, Proteus syndrome, etc. Localized early eruption of permanent teeth could be due to early extraction of deciduous teeth. Presented here is an extremely rare case of early eruption of permanent canines in a 7-year old female child. Though the number of such cases is very limited, the clinician should poses adequate knowledge and keeps an open eye to identify such cases.

  1. Comparison of participants and non-participants in a randomized study of prevention of depression in patients with acute coronary syndrome

    DEFF Research Database (Denmark)

    Hansen, Baiba; Hanash, Jamal A.; Rasmussen, Alice;

    2011-01-01

    Background: The prevalence of depression and anxiety in patients after acute coronary syndrome (ACS) is higher than in the general population. In a study on prevention of post-ACS depression, more than half of eligible patients declined participation. Aims: The aim of this study was to evaluate...... but did not predict participation in the study of prevention of depression....... whether symptoms of depression and anxiety in participants and non-participants predicted participation in the study. Methods: This substudy was conducted between May 2005 and April 2007. Patients with ACS, eligible for the study (n=302) were asked four questions on depression and anxiety from the Primary...

  2. Magnetic Fields: Visible and Permanent.

    Science.gov (United States)

    Winkeljohn, Dorothy R.; Earl, Robert D.

    1983-01-01

    Children will be able to see the concept of a magnetic field translated into a visible reality using the simple method outlined. Standard shelf paper, magnets, iron filings, and paint in a spray can are used to prepare a permanent and well-detailed picture of the magnetic field. (Author/JN)

  3. Overview on permanent magnetic actuator

    Institute of Scientific and Technical Information of China (English)

    2006-01-01

    Permanent magnetic actuator (PMA), as a new electronic actuator of vacuum circuit breakers, certainly will be used to replace the traditional mechanical actuator. It has such advantages as simple structure, high reliability, free maintenance, and so on. This paper summarizes the development, structure, magnetic analysis, character analysis, and control strategy of PMA, and also predicts the future trend of PMA development

  4. Representativeness of Participants in a Lifestyle Intervention Study in Obese Pregnant Women - the Difference between Study Participants and Non-Participants

    Directory of Open Access Journals (Sweden)

    Joanna Gesche

    2014-11-01

    Full Text Available Objective: To examine the representativeness of participants attending a lifestyle intervention study addressing obese pregnant women. Methods: Retrospective comparison of baseline data, attendance to oral glucose tolerance test (OGTT during pregnancy, and pregnancy outcome in eligible women stratified according to study participation. Of 750 eligible women with a self-reported BMI > 30 kg/m2, and a live singleton pregnancy, 510 were eligible for inclusion and 425 were randomized to either active intervention (n= 284 or to standard obstetric care (n= 141 including two standard OGTT. The 85 women who declined participation or were excluded due to competing diseases and 240 women who did not respond to the initial invitation received the same standard care. Results: The randomized women had similar BMI but a lower parity and age, and were more frequently non-smokers, born in Denmark and married or cohabitating with their partner than the non-participants. Women participating in the trial had a higher compliance to the second OGTT compared to non-participants, also after correcting for age and nationality. There was no difference in pregnancy outcome, i.e., fetal weight and length, gestational age as well as mode of delivery. Conclusion: Women declining participation in a randomized lifestyle intervention study in pregnancy have characteristics indicating they are those who might benefit the most from lifestyle intervention.

  5. Performances and economy comparison analysis of different fiber reinforced wood-plastic composite formwork%不同纤维增强木塑复合模板性能与经济性对比

    Institute of Scientific and Technical Information of China (English)

    孙胜伟; 罗健林; 刘文清; 李秋义; 胡小川; 高嵩; 韩鹏

    2013-01-01

    Employing different surfactants modification,vibromill or ultrasonic treatment dispersion tecnnique,chrysotile asbestos fiber(CAF),polyvinyl alcohol fiber(PVAF),basalt fiber(BF) with different loading was pre-dispersed in water,mixed with the wood flour,and then compounded to the molting polypropylene by a mixing roll,respectively.Subsequently,3 kinds of fiber reinforced wood-plastic composite sheets (CAF/WPC,PVAF/WPC,BF/WPC) were formed by hot-press method.The tensile,flexural,impact and wear-resisting performances of the corresponding composite were studied by dumb-bell sample tensile testing,three-point bending,pendulum impact and rotary abrasion method,respectively,as well as the economy comparison of three sorts of the composite serving as formwork.Results show,the tensile,flexural,impact,wear-resisting properties and single cost saving as formwork of the CAF/WPC,PVAF/WPC,BF/WPC with 10 wt% fiber addition,increases 66.6%,48.4%,36.3%,68.9%,67.33%.33.2%,54.3%,38.8%,81.8%,63.47%.44.2%,24.7%,9.3%,85.6%,60.93%,respectively.Obviously,the quality and cheap CAF addition can bring forth both good improvement on the comprehensive performance of the WPC as formwork,and the least increased cost,which has a good prospect of application in fresh water formwork field.%结合不同表面活性剂改性、振动磨或超声波处理工艺分别将温石棉纤维(CAF)、聚乙烯醇纤维(PVAF)、玄武岩纤维(BF)预分散在水中,与木粉混杂后辊炼到熔融聚丙烯(PP)中,热压成型3种纤维增强木塑复合材料(CAF/WPC、PVAF/WPC、BF/WPC).通过哑铃形试样拉伸法、三点弯曲法、摆锤冲击法、旋转磨耗法分别表征其拉伸、弯曲、冲击和耐磨性能,并对3种材料用作建筑模板的经济性进行对比分析.结果表明,相比于空白WPC,掺有10%(质量百分比)各纤维的CAF/WPC、PVAF/WPC、BF/WPC的拉伸、弯曲、冲击强度、耐磨性能与单次折算节约费分别提高了66.6

  6. Construction techniques for high-level large cantilever formwork platform of concrete structures%高位大悬挑混凝土结构支模平台施工技术

    Institute of Scientific and Technical Information of China (English)

    马岷成

    2013-01-01

    With the example of a high-rise public building,the author introduces a construction technique for high-level large cantilever formwork platform of concrete structures.This technique adopts basic structural unit made up of section steel to stand steel platform and to solve the problem that it is lack of safety stock to stand scaffolding with steel cantilever beam.%以某高层公共建筑工程为例,介绍了一种高位大悬挑混凝土结构支模平台施工技术,该技术采用型钢基本结构单元搭设钢平台,解决了型钢悬挑梁平台安全储备不足的问题。

  7. Innovative Application of Needle-beam Full-circular Formwork Jumbos in Construction of Lining of Sub-sea Water-diversion Tunnel%针梁式全圆模板台车在海底引水隧洞工程衬砌施工中的创新应用

    Institute of Scientific and Technical Information of China (English)

    陈启伟; 王亚利; 张建

    2013-01-01

    Needle-beam full-circular formwork jumbos are used in the construction of the secondary lining of the intake tunnel of Taishan Nuclear Power Plant,so as to realize once-for-all and rapid construction of the full-circular concrete lining of the sub-sea water-diversion tunnel.In this paper,the method and procedure of the construction of the secondary lining are analyzed,the main structure and technical parameters of the formwork jumbos are presented,and the key construction technologies are described.Furthermore,three innovative points of the application of the formwork jumbos,including the construction arrangement and design inside and outside of the tunnel in the case of 3 formwork jumbos,the continuous construction of the lining by means of 3 formwork jumbos and the cautions for the continuous construction of the lining by 3 formwork jumbos,are summarized.%为了解决海底引水隧洞衬砌混凝土施工全圆一次成型和长距离隧洞衬砌施工短工期内快速完成等诸多问题,选用针梁式全圆模板台车对台山核电站取水隧洞工程进行二次衬砌施工.分析长大隧洞二次衬砌总体施工方法及流程,详细介绍模板台车的构造及主要技术参数,阐述模板台车关键施工工艺和技术.结合工程概况和工期要求,总结了以下3个创新应用结论:在3台模板台车连续跳板作业条件下,隧道内、外的施工布局和流程设计;3台模板台车一次性灌注整体模板连续跳板衬砌施工的工艺和方法;3台模板台车连续跳板流水线作业施工注意事项.

  8. PERMANENT-MAGNET INDUCTION GENERATORS: AN OVERVIEW

    Directory of Open Access Journals (Sweden)

    K. S. S. RAMAKRISHNAN

    2011-06-01

    Full Text Available The advantage of using a permanent-magnet induction generator (PMIG instead of a conventional induction generator is its ability to suppress inrush current during system linking when synchronous input is performed. Induction machines excited with permanent-magnet (PM are called permanent-magnet induction generators. This paper presents an exhaustive survey of the literature discussing the classification of permanent-magnet machines, process of permanent-magnet excitation and voltage build-up, modelling, steady-state and performance analysis of the permanent-magnet induction generators.

  9. Non-participation in screening

    DEFF Research Database (Denmark)

    Dugué, Pierre-Antoine; Lynge, Elsebeth; Bjerregaard, Beth;

    2012-01-01

    To determine the impact of comprehensiveness of cytology registration on the proportion of cervical cancer patients without a recent screening history.......To determine the impact of comprehensiveness of cytology registration on the proportion of cervical cancer patients without a recent screening history....

  10. Manganese-based Permanent Magnets

    Directory of Open Access Journals (Sweden)

    Ian Baker

    2015-08-01

    Full Text Available There is a significant gap between the energy product, BH, where B is the magnetic flux density and H is the magnetic field strength, of both the traditional ferrite and AlNiCo permanent magnets of less than 10 MGOe and that of the rare earth magnets of greater than 30 MGOe. This is a gap that Mn-based magnets could potentially, inexpensively, fill. This Special Issue presents work on the development of both types of manganese permanent magnets. Some of the challenges involved in the development of these magnets include improving the compounds’ energy product, increasing the thermal stability of these metastable compounds, and producing them in quantity as a bulk material.[...

  11. Automated phenotyping of permanent crops

    Science.gov (United States)

    McPeek, K. Thomas; Steddom, Karl; Zamudio, Joseph; Pant, Paras; Mullenbach, Tyler

    2017-05-01

    AGERpoint is defining a new technology space for the growers' industry by introducing novel applications for sensor technology and data analysis to growers of permanent crops. Serving data to a state-of-the-art analytics engine from a cutting edge sensor platform, a new paradigm in precision agriculture is being developed that allows growers to understand the unique needs of each tree, bush or vine in their operation. Autonomous aerial and terrestrial vehicles equipped with multiple varieties of remote sensing technologies give AGERpoint the ability to measure key morphological and spectral features of permanent crops. This work demonstrates how such phenotypic measurements combined with machine learning algorithms can be used to determine the variety of crops (e.g., almond and pecan trees). This phenotypic and varietal information represents the first step in enabling growers with the ability to tailor their management practices to individual plants and maximize their economic productivity.

  12. Trans-permanent magnetic actuation

    Science.gov (United States)

    Farmer, Daniel Jay

    The demands for an actuator to deploy, position and shape large spaced-based structures form a unique set of design criteria. In many applications it is desirable to hold displacements or forces between two points to within specified requirements (the regulation problem) and to periodically to change position (the tracking problem). Furthermore, the interest generally lies in satisfying the dynamic performance requirements while expending minimal power, while meeting tight tolerances and while experiencing little wear and fatigue. The actuator must also be able to withstand a variety of operational conditions such as impacts and thermal changes over an extended period of time. Current trends in large-scale structures have addressed the demands by using conventional actuators and motors, along with elaborate linkages or mechanisms to shape, position, protect and deploy. The developed designs use unique characteristics of permanent magnets to create simple direct-acting actuators and motors very suitable for space based structures. The developed trans-permanent magnetic (T-PM) actuators and motors are systems consisting of one or more permanent magnets, some of whose magnetic strengths can be switched on-board by surrounding pulse-coils. The T-PM actuator and motors expend no power during regulation. The T-PM can periodically change or remove the strength of its own magnets thereby enabling both fine-tune adjustments (microsteps) and large-scale adjustments (rotation). The fine (microstep) adjustments are particularly helpful in thermally varying space environments. The large-scale adjustments (rotation) are particularly helpful in deployment where the structure or antenna must experience large-angle rotations and/or large displacements. T-PM concepts are illustrated in direct acting actuators and built into stepper motor and permanent magnet motor applications. Several examples of design, analysis and testing are developed to verify the technology and supporting

  13. The cycloid Permanent Magnetic Gear

    DEFF Research Database (Denmark)

    Rasmussen, Peter Omand; Andersen, Torben Ole; Jørgensen, Frank T.

    2008-01-01

    This paper presents a new permanent-magnet gear based on the cycloid gearing principle. which normally is characterized by an extreme torque density and a very high gearing ratio. An initial design of the proposed magnetic gear was designed, analyzed, and optimized with an analytical model...... regarding torque density. The results were promising as compared to other high-performance magnetic-gear designs. A test model was constructed to verify the analytical model....

  14. Using Social Network Analysis To Map Participation And Non-participation In Health Promotion and Community-building Among Vulnerable Populations

    DEFF Research Database (Denmark)

    Hindhede, Anette Lykke

    In empowerment and asset-based approaches to community development, the ability to change local residents’ perception of themselves and their neighbours from that of persons with needs that can only be met with the help of professionals to that of a more self-reliant group with assets...... and capacities for collective and collaborative problemsolving is seen as key to successful community building (Kretzmann and McKnight, 1993). By using social network analysis and Bourdieu’s definition of capital, this study aimed to identify patterns of participation and non-participation in a community......-building project aiming at increasing upward mobility and social capital within the area and increase equity in health. This presentation will outline the tensions and contradictions which accompany policies and interventions that seek to strengthen local communities as a means of promoting health. Emerging...

  15. The population-based oncological health care study OVIS – recruitment of the patients and analysis of the non-participants

    Directory of Open Access Journals (Sweden)

    Raspe Heiner

    2008-10-01

    Full Text Available Abstract Background The ageing of the population is expected to bring an enormous growth in demand for oncological health care. In order to anticipate and respond to future trends, cancer care needs to be critically evaluated. The present study explores the possibility of conducting representative and population-based research on cancer care on the basis of data drawn from the Cancer Registry. Methods A population-based state-wide cohort study (OVIS has been carried out in Schleswig-Holstein, Germany. All patients with malignant melanoma, breast, or prostate cancer were identified in the Cancer Registry. Epidemiological data were obtained for all the patients and screened for study eligibility. A postal questionnaire requesting information on diagnosis, therapy, QoL and aftercare was sent to eligible patients. Results A total of 11,489 persons diagnosed with the cancer types of interest in the period from January 2002 to July 2004 were registered in the Cancer Registry. Of the 5,354 (47% patients who gave consent for research, 4,285 (80% of consenters completed the questionnaire. In terms of relevant epidemiological variables, participants with melanoma were not found to be different from non-participants with the same diagnosis. However, participants with breast or prostate cancer were slightly younger and had smaller tumours than patients who did not participate in our study. Conclusion Population-based cancer registry data proved to be an invaluable resource for both patient recruitment and non-participant analysis. It can help improve our understanding of the strength and nature of differences between participants and non-respondents. Despite minor differences observed in breast and prostate cancer, the OVIS-sample seems to represent the source population adequately.

  16. Factors Associated with Non-Participation and Non-Adherence in Directly Observed Mass Drug Administration for Malaria in The Gambia.

    Directory of Open Access Journals (Sweden)

    Susan Dierickx

    Full Text Available The potential benefits of Mass Drug Administration (MDA for malaria elimination are being considered in several malaria endemic countries where a decline in malaria transmission has been reported. For this strategy to work, it is important that a large proportion of the target population participates, requiring an in-depth understanding of factors that may affect participation and adherence to MDA programs.This social science study was ancillary to a one-round directly observed MDA campaign with dihydroartemisinin-piperaquine, carried out in 12 villages in rural Gambia between June and August 2014. The social science study employed a mixed-methods approach combining qualitative methods (participant observation and in-depth interviewing and quantitative methods (structured follow-up interviews among non-participating and non-adhering community members.Of 3942 people registered in the study villages, 67.9% adhered to the three consecutive daily doses. For the remaining villagers, 12.6% did not attend the screening, 3.5% was not eligible and 16% did not adhere to the treatment schedule. The main barriers for non-participation and adherence were long and short-term mobility of individuals and specific subgroups, perceived adverse drug reactions and rumors, inconveniences related to the logistics of MDA (e.g. waiting times and the perceived lack of information about MDA.While, there was no fundamental resistance from the target communities, adherence was 67.9%. This shows the necessity of understanding local perceptions and barriers to increase its effectiveness. Moreover, certain of the constraining factors were socio-spatially clustered which might prove problematic since focal areas of residual malaria transmission may remain allowing malaria to spread to adjacent areas where transmission had been temporarily interrupted.

  17. Permanent magnets including undulators and wigglers

    OpenAIRE

    Bahrdt, J.

    2011-01-01

    After a few historic remarks on magnetic materials we introduce the basic definitions related to permanent magnets. The magnetic properties of the most common materials are reviewed and the production processes are described. Measurement techniques for the characterization of macroscopic and microscopic properties of permanent magnets are presented. Field simulation techniques for permanent magnet devices are discussed. Today, permanent magnets are used in many fields. This article concentrat...

  18. 21 CFR 886.4445 - Permanent magnet.

    Science.gov (United States)

    2010-04-01

    ... 21 Food and Drugs 8 2010-04-01 2010-04-01 false Permanent magnet. 886.4445 Section 886.4445 Food... DEVICES OPHTHALMIC DEVICES Surgical Devices § 886.4445 Permanent magnet. (a) Identification. A permanent magnet is a nonelectric device that generates a magnetic field intended to find and remove...

  19. 南水北调工程七里河倒虹吸管身顶板台车的设计与施工%Design and construction of roof formwork trolley for Qilihe Inverted Siphon of South-to-North Water Transfer Project

    Institute of Scientific and Technical Information of China (English)

    王永兴; 李茜

    2012-01-01

    根据南水北调工程邢台七里河渠道倒虹吸工程管身的结构特点、施工质量和工程进度,设计了管身顶板台车,详细介绍了其结构特点、功能原理及施工工艺.而且对其非标关键部件主梁进行了强度和刚度计算,应用有限元方法,分析了轨道管的强度和安全性.此外,通过与传统组合钢模板和隧道模板台车施工工艺的对比分析,得出结论:采用管身顶板台车模板具有良好的施工质量和综合效益.%According to the structure characteristics, the construction quality and die work schedule of Qilihe Canal Inverted Siphon located in Xingtai City of the South-to-North Water Transfer Project, a roof formwork trolley for the construction of the inverted siphon is designed and the structural features, function principle and construction technology of the trolley are describedherein in detail. Furthermore, the calculation on the strength and stiffness of the main beam-a non-standardized key part ismade and the strength and safety of the steel pipe for railway is analyzed with the finite element method. Moreover, through a comparative analysis made with the conventional combined steel formwork and tunnel formwork trolley, a conclusion is obtained that better construction quality and comprehensive benefit can be got with the roof formwork trolley for construction of inverted siphon presented hereia

  20. Technology for construction of formwork for fair- faced concrete for open tunnel in east artificial island of Hongkong- Zhuhai- Macao Bridge%港珠澳大桥东人工岛敞开段清水混凝土模板施工技术

    Institute of Scientific and Technical Information of China (English)

    张奎; 吴海章; 陈传正

    2016-01-01

    Formwork is very important for construction of fair-faced concrete and its quality is the key to a project. The method for assembling fair-faced concrete formwork is introduced and the technology for construction of formwork for fair-faced concrete is described on the basis of the engineering practice in the construction of fair-faced concrete for the open tunnel walls in the east artificial island of Hongkong-Zhuhai-Macao Bridge.%清水混凝土施工中,模板处于重要地位,其质量是工程的关键。结合港珠澳大桥岛隧工程东人工岛隧道敞开段墙身清水混凝土施工实际,介绍了清水混凝土模板的拼装方法,阐述了清水混凝土模板施工技术。

  1. Permanent-File-Validation Utility Computer Program

    Science.gov (United States)

    Derry, Stephen D.

    1988-01-01

    Errors in files detected and corrected during operation. Permanent File Validation (PFVAL) utility computer program provides CDC CYBER NOS sites with mechanism to verify integrity of permanent file base. Locates and identifies permanent file errors in Mass Storage Table (MST) and Track Reservation Table (TRT), in permanent file catalog entries (PFC's) in permit sectors, and in disk sector linkage. All detected errors written to listing file and system and job day files. Program operates by reading system tables , catalog track, permit sectors, and disk linkage bytes to vaidate expected and actual file linkages. Used extensively to identify and locate errors in permanent files and enable online correction, reducing computer-system downtime.

  2. CERN Permanent exhibitions short version

    CERN Multimedia

    2016-01-01

    Visits Explore by yourself the issues CERN's physicists are trying to solve: given that the entire universe is made of particles, where do they come from? Why do they behave in the way they do? Discover the massive apparatus used by physicists at CERN, like the LHC, and see how each part works. CERN invites the public to discover the mysteries of the Universe and the work of the world's biggest physics laboratory through free of charge guided tours and permanent exhibitions. As a group, with friends, individually, on foot, on your bike, come and discover CERN or explore it virtually. Welcome!

  3. New permanent magnets; manganese compounds.

    Science.gov (United States)

    Coey, J M D

    2014-02-12

    The exponential growth of maximum energy product that prevailed in the 20th century has stalled, leaving a market dominated by two permanent magnet materials, Nd2Fe14B and Ba(Sr)Fe12O19, for which the maximum theoretical energy products differ by an order of magnitude (515 kJ m(-3) and 45 kJ m(-3), respectively). Rather than seeking to improve on optimized Nd-Fe-B, it is suggested that some research efforts should be devoted to developing appropriately priced alternatives with energy products in the range 100-300 kJ m(-3). The prospects for Mn-based hard magnetic materials are discussed, based on known Mn-based compounds with the tetragonal L10 or D022 structure or the hexagonal B81 structure.

  4. CHALLENGES OF PERMANENT TEACHER TRAINING

    Directory of Open Access Journals (Sweden)

    María Manuela Valles-Ornelas

    2015-07-01

    Full Text Available The new challenges for teachers and managers require to assume permanent formation as a tool for responding effectively and efficiently to them, different perspective to strengthen from the initial teacher education programs. The research was done in a primary school in the state of Chihuahua. The method used was research action, the question was: How can we encourage the lifelong learning and training of the staff of this school, with the purpose to assist them in these processes to improve the service that the school provides to students. The school group is the center of the process, the cooperative and collaborative work accompanied by educational leadership and persuasive provide better results, and all accompanied by the professional selfinvitation.

  5. Intrusive luxation of 60 permanent incisors

    DEFF Research Database (Denmark)

    Tsilingaridis, Georgios; Malmgren, Barbro; Andreasen, Jens O;

    2012-01-01

      Intrusive luxation in the permanent dentition is an uncommon injury but it is considered one of the most severe types of dental trauma because of the risk for damage to the periodontal ligament, pulp and alveolar bone. Management of intrusive luxation in the permanent dentition is controversial....... The purpose of this study was to evaluate pulp survival and periodontal healing in intrusive luxated permanent teeth in relation to treatment alternatives, degree of intrusion and root development....

  6. Dental Interventions on First Permanent Molars

    OpenAIRE

    2016-01-01

    The first permanent molars have the biggest dental morbidity and mortality of all permanent teeth. The main aim was to evaluate of the most common dental problems and procedures that are performed on the first permanent molars. Material and method: examination was performed in three private dental offices, two from urban and one from rural region, over a period of 2 years. The data was obtained by using dental charts from the patients and by the ambulatory register for performe...

  7. Permanence of Stochastic Lotka-Volterra Systems

    Science.gov (United States)

    Liu, Meng; Fan, Meng

    2017-04-01

    This paper proposes a new definition of permanence for stochastic population models, which overcomes some limitations and deficiency of the existing ones. Then, we explore the permanence of two-dimensional stochastic Lotka-Volterra systems in a general setting, which models several different interactions between two species such as cooperation, competition, and predation. Sharp sufficient criteria are established with the help of the Lyapunov direct method and some new techniques. This study reveals that the stochastic noises play an essential role in the permanence and characterize the systems being permanent or not.

  8. Integral movable formwork construction technology of extra-long ditch cable groove%特长隧道水沟电缆槽整体移动模架施工技术

    Institute of Scientific and Technical Information of China (English)

    李彦乐

    2016-01-01

    结合某隧道工程的现场施工条件,研发出适合该工程特点的水沟电缆槽整体移动模架施工技术,介绍了该施工技术的工艺流程,并对其施工要点进行了系统总结,通过比较分析指出采用该施工技术,改善了水沟电缆槽的外观质量,提高了施工工效,取得了良好的经济效益。%Combining with the tunnel engineering field construction conditions,the paper studies integral movable formwork construction technol-ogy of ditch cable groove fitting the engineering features,introduces its construction technology procedures,and systematically summarizes its con-struction points. Through comparative analysis,it points out that:through applying the construction technology,it improves the ditch cable groove appearance quality,improves construction effect,and achieves good economic benefits.

  9. Life Cycle Cost Analysis of Composite Shear Wall System with Heat Preservation Formwork%保温墙模复合剪力墙体系全寿命周期成本分析

    Institute of Scientific and Technical Information of China (English)

    冯占红; 刘元珍

    2011-01-01

    The life cycle cost analysis on composite shear wall system with heat preservation formwork is made.lt establishes a building life cycle cost calculating mode to make a comprehensive economical analysis for buildings,then shows that, life cycle cost of this system is significantly lower than that of the common shear wall system and the masonry-concrete structure. The system also brings signiricant economic benefits when it improves the housing qualities of residential buildings, such as application, security, durahility, comfortableness.%对新型建筑节能体系--保温墙模复合剪力墙体系进行全寿命周期成本分析.根据节能建筑实际建立住宅全寿命周期成本计算数学模型,运用该模型进行住宅的经济效果综合评价.经济性综合评价结果表明:该体系的全寿命周期成本显著低于普通剪力墙体系及砖混结构体系.体系在提高住宅适用性、安全性、耐久性、舒适性等住宅品质的同时,还带来了显著的经济效益.

  10. Analysis Based on the Large Span Concrete Structure Fastener Type Steel Pipe Formwork Support%基于大跨砼结构中扣件式钢管模板支架的分析

    Institute of Scientific and Technical Information of China (English)

    陈洁; 徐龄伟; 马丽娟

    2012-01-01

      [abstract] The city overpass and elevated road, elevated Brid-ges and the span larger building facilities are increasing, this is sustainable development inevitable result of the city of diver-sity and national basic building. Based on the author related conditions, the paper makes analysis of the large span concrete structure fastener type steel pipe formwork support design and application, and the research for further promotion of this technique has certain significance.%  城市中的立交桥等高架道路、高架桥梁和那些跨度比较大的建筑设施正在增多,这是城市多元化和国家基础性建筑可持续发展的必然结果。文中基于笔者相关工况,分析了大跨砼结构中扣件式钢管模板支架设计与应用,这一研究对于进一步推广这一技术具有一定的意义。

  11. 22 CFR 401.3 - Permanent offices.

    Science.gov (United States)

    2010-04-01

    ... Relations INTERNATIONAL JOINT COMMISSION, UNITED STATES AND CANADA RULES OF PROCEDURE General § 401.3 Permanent offices. The permanent offices of the Commission shall be at Washington, in the District of... of the Commission shall have full charge and control of said offices, respectively....

  12. resonant inverter supplied interior permanent magnet (ipm)

    African Journals Online (AJOL)

    user

    Permanent Magnet (IPM) or Surface Permanent. Magnet ... desired torque is produced to rotate the motor in the desired ... u axis, and the direct-axis of the rotor is at angle θ from the ..... Based Stator Flux Estimator” International. Journal of ...

  13. Comparison of adjustable permanent magnetic field sources

    DEFF Research Database (Denmark)

    Bjørk, Rasmus; Bahl, Christian Robert Haffenden; Smith, Anders

    2010-01-01

    A permanent magnet assembly in which the flux density can be altered by a mechanical operation is often significantly smaller than comparable electromagnets and also requires no electrical power to operate. In this paper five permanent magnet designs in which the magnetic flux density can...

  14. Magnetic guns with cylindrical permanent magnets

    DEFF Research Database (Denmark)

    Vokoun, David; Beleggia, Marco; Heller, Luděk

    2012-01-01

    The motion of a cylindrical permanent magnet (projectile) inside a tubular permanent magnet, with both magnets magnetized axially, illustrates nicely the physical principles behind the operation of magnetic guns. The force acting upon the projectile is expressed semi-analytically as derivative...

  15. Leadership in a (permanent) crisis.

    Science.gov (United States)

    Heifetz, Ronald; Grashow, Alexander; Linsky, Marty

    2009-01-01

    The current economic crisis is not just another rough spell. Today's mix of urgency, high stakes, and uncertainty will continue even after the recession ends. The immediate crisis--which we will get through with policy makers' expert technical adjustments--sets the stage for a sustained, or even permanent, crisis, a relentless series of challenges no one has encountered before. Instead of hunkering down and relying on their familiar expertise to deal with the sustained crisis, people in positions of authority--whether they are CEOs or managers heading up a company initiative--must practice what the authors call adaptive leadership. They must, of course, tackle the underlying causes of the crisis, but they must also simultaneously make the changes that will allow their organizations to thrive in turbulent environments. Adaptive leadership is an improvisational and experimental art, requiring some new practices. Like Julie Gilbert, who overcame internal resistance to reorient Best Buy toward female purchasers, adaptive leaders get things done to meet today's challenges and then modify those things to thrive in tomorrow's world. They also embrace disequilibrium, using turbulence as an opportunity to build crucial new capacities, as Paul Levy did to rescue Beth Israel Deaconess Medical Center from a profound financial crisis. Finally, adaptive leaders, such as Egon Zehnder, the founder of an executive search firm, draw out the leadership skills that reside deep in the organization, recognizing the interdependence of all employees and mobilizing everyone to generate solutions.

  16. Finite element modeling of permanent magnet devices

    Science.gov (United States)

    Brauer, J. R.; Larkin, L. A.; Overbye, V. D.

    1984-03-01

    New techniques are presented for finite element modeling of permanent magnets in magnetic devices such as motors and generators. These techniques extend a previous sheet-current permanent magnet model that applies only for straight line B-H loops and rectangular-shaped magnets. Here Maxwell's equations are used to derive the model of a permanent magnet having a general curved B-H loop and any geometric shape. The model enables a nonlinear magnetic finite element program to use Newton-Raphson iteration to solve for saturable magnetic fields in a wide variety of devices containing permanent magnets and steels. The techniques are applied to a brushless dc motor with irregular-shaped permanent magnets. The calculated motor torque agrees well with measured torque.

  17. Gating of Permanent Molds for ALuminum Casting

    Energy Technology Data Exchange (ETDEWEB)

    David Schwam; John F. Wallace; Tom Engle; Qingming Chang

    2004-03-30

    This report summarizes a two-year project, DE-FC07-01ID13983 that concerns the gating of aluminum castings in permanent molds. The main goal of the project is to improve the quality of aluminum castings produced in permanent molds. The approach taken was determine how the vertical type gating systems used for permanent mold castings can be designed to fill the mold cavity with a minimum of damage to the quality of the resulting casting. It is evident that somewhat different systems are preferred for different shapes and sizes of aluminum castings. The main problems caused by improper gating are entrained aluminum oxide films and entrapped gas. The project highlights the characteristic features of gating systems used in permanent mold aluminum foundries and recommends gating procedures designed to avoid common defects. The study also provides direct evidence on the filling pattern and heat flow behavior in permanent mold castings.

  18. 中国股票市场非参与之谜分析%Analysis of the Non-Participation Puzzle of China's Stock Market

    Institute of Scientific and Technical Information of China (English)

    黄毓慧

    2014-01-01

    用微观调研数据分析中国股票市场非参与之谜,验证国外文献对该问题的解释:资金参与成本、认知水平,并进一步探索受教育程度、信息对认知水平的影响。实证分析从参与决策、参与深度两个层次递进展开,首先采用2SPLS克服认知水平和股市参与之间的内生性,证实了股市参与和认知之间存在双向因果关系,其次采用Tobit模型研究股票市场的参与深度。研究表明:中国股票市场参与受财富、教育、认知、信息等因素的影响,现阶段认知和信息的影响程度大于财富的影响程度,是影响中国股票市场参与的主要因素。结论凸显了投资者教育的重要性和紧迫性。%The paper analyzes the non-participation puzzle of China's stock market with mi-croscopic investigation data to prove the explanation in foreign literatures about the problem,such as capital participation cost and cognition level. Further studies are made on the education back-ground,and the influence of information on cognition level. Empirical study is made from two lev-els. Firstly,2SPLS is used to overcome the endogenous relationship between cognition level and stock market participation,which proves that there is a mutual cause-effect relationship between the two factors. Secondly,Tobit model is used to study the participation width of the stock market. Research shows that China's stock market is influenced by factors such as wealth,education,cog-nition and information. At present,the impacts of cognition and information are larger than that of the wealth,which are the main factors influencing China's stock market participation. Therefore, the education of investors becomes more important and urgent.

  19. Permanency and the Foster Care System.

    Science.gov (United States)

    Lockwood, Katie K; Friedman, Susan; Christian, Cindy W

    2015-10-01

    Each year over 20,000 youth age out of the child welfare system without reaching a permanent placement in a family. Certain children, such as those spending extended time in foster care, with a diagnosed disability, or adolescents, are at the highest risk for aging out. As young adults, this population is at and increased risk of incarceration; food, housing, and income insecurity; unemployment; educational deficits; receipt of public assistance; and mental health disorders. We reviewed the literature on foster care legislation, permanency, outcomes, and interventions. The outcomes of children who age out of the child welfare system are poor. Interventions to increase permanency include training programs for youth and foster parents, age extension for foster care and insurance coverage, an adoption tax credit, and specialized services and programs that support youth preparing for their transition to adulthood. Future ideas include expanding mentoring, educational support, mental health services, and post-permanency services to foster stability in foster care placements and encourage permanency planning. Children in the child welfare system are at a high risk for physical, mental, and emotional health problems that can lead to placement instability and create barriers to achieving permanency. Failure to reach the permanency of a family leads to poor outcomes, which have negative effects on the individual and society. Supporting youth in foster care throughout transitions may mediate the negative outcomes that have historically followed placement in out-of-home care. Copyright © 2015 Mosby, Inc. All rights reserved.

  20. Permanent Magnetic Bearing for Spacecraft Applications

    Science.gov (United States)

    Morales, Winfredo; Fusaro, Robert; Kascak, Albert

    2008-01-01

    A permanent, totally passive magnetic bearing rig was designed, constructed, and tested. The suspension of the rotor was provided by two sets of radial permanent magnetic bearings operating in the repulsive mode. The axial support was provided by jewel bearings on both ends of the rotor. The rig was successfully operated to speeds of 5500 rpm using an air impeller. Radial and axial stiffnesses of the permanent magnetic bearings were experimentally measured and then compared to finite element results. The natural damping of the rotor was measured and a damping coefficient was calculated.

  1. Macroscopic Simulation of Isotropic Permanent Magnets

    CERN Document Server

    Bruckner, Florian; Vogler, Christoph; Heinrichs, Frank; Satz, Armin; Ausserlechner, Udo; Binder, Gernot; Koeck, Helmut; Suess, Dieter

    2015-01-01

    Accurate simulations of isotropic permanent magnets require to take the magnetization process into account and consider the anisotropic, nonlinear, and hysteretic material behaviour near the saturation configuration. An efficient method for the solution of the magnetostatic Maxwell equations including the description of isotropic permanent magnets is presented. The algorithm can easily be implemented on top of existing finite element methods and does not require a full characterization of the hysteresis of the magnetic material. Strayfield measurements of an isotropic permanent magnet and simulation results are in good agreement and highlight the importance of a proper description of the isotropic material.

  2. Macroscopic simulation of isotropic permanent magnets

    Science.gov (United States)

    Bruckner, Florian; Abert, Claas; Vogler, Christoph; Heinrichs, Frank; Satz, Armin; Ausserlechner, Udo; Binder, Gernot; Koeck, Helmut; Suess, Dieter

    2016-03-01

    Accurate simulations of isotropic permanent magnets require to take the magnetization process into account and consider the anisotropic, nonlinear, and hysteretic material behaviour near the saturation configuration. An efficient method for the solution of the magnetostatic Maxwell equations including the description of isotropic permanent magnets is presented. The algorithm can easily be implemented on top of existing finite element methods and does not require a full characterization of the hysteresis of the magnetic material. Strayfield measurements of an isotropic permanent magnet and simulation results are in good agreement and highlight the importance of a proper description of the isotropic material.

  3. Are participants in markets for water rights more efficient in the use of water than non-participants? A case study for Limarí Valley (Chile).

    Science.gov (United States)

    Molinos-Senante, María; Donoso, Guillermo; Sala-Garrido, Ramon

    2016-06-01

    The need to increase water productivity in agriculture has been stressed as one of the most important factors to achieve greater agricultural productivity and sustainability. The main aim of this paper is to investigate whether there are differences in water use efficiency (WUE) between farmers who participate in water markets and farmers who do not participate in them. Moreover, the use of a non-radial data envelopment analysis model allows to compute global efficiency (GE), WUE as well the efficiency in the use of other inputs such as fertilizers, pesticides, energy, and labor. In a second stage, external factors that may affect GE and WUE are explored. The empirical application focuses on a sample of farmers located in Limarí Valley (Chile) where regulated permanent water rights (WR) markets for surface water have a long tradition. Results illustrate that WR sellers are the most efficient in the use of water while non-traders are the farmers that present the lowest WUE. From a policy perspective, significant conclusions are drawn from the assessment of agricultural water productivity in the framework of water markets.

  4. Permanent Magnet Boosted Modular Switched Reluctance Motor

    Directory of Open Access Journals (Sweden)

    SZABÓ Loránd

    2016-10-01

    Full Text Available This paper deals with the analyses of a novel motor structure obtained by boosting with permanent magnets a formerly studied modular switched reluctance motor. Upon dynamic simulation results the improvements of the proposed motor are emphasized.

  5. Practical considerations for permanent total enclosures

    Energy Technology Data Exchange (ETDEWEB)

    Worrall, M. [Amcec Adsorption Systems, Schaumburg, IL (United States)

    1997-12-31

    This paper considers some of the practical consideration of Permanent Total Enclosures (PTEs) for gravure printing facilities. In particular the dispersion of fugitive losses from the presses by thermal air currents generated by heat from the press dryers.

  6. 78 FR 14122 - Revocation of Permanent Variances

    Science.gov (United States)

    2013-03-04

    ... Occupational Safety and Health Administration Revocation of Permanent Variances AGENCY: Occupational Safety and Health Administration (OSHA), Labor. ACTION: Notice of revocation. SUMMARY: With this notice, OSHA is... into consideration these newly corrected cross references. DATES: The effective date of the...

  7. Permanent traffic counters maintained by the NMDOT

    Data.gov (United States)

    Earth Data Analysis Center, University of New Mexico — A point dataset representing the permanent traffic counters maintained by the NMDOT. Event mapped dataset by LRS info provided by Traffic group.

  8. Novel Switched Flux Permanent Magnet Machine Topologies

    Institute of Scientific and Technical Information of China (English)

    诸自强

    2012-01-01

    This paper overviews various switched flux permanent magnet machines and their design and performance features,with particular emphasis on machine topologies with reduced magnet usage or without using magnet,as well as with variable flux capability.

  9. Computing matrix permanent with collective boson operators

    CERN Document Server

    Huh, Joonsuk

    2016-01-01

    Computing permanents of matrices are known to be a classically hard problem that the computational cost grows exponentially with the size of the matrix increases. So far, there exist a few classical algorithms to compute the matrix permanents in deterministic and in randomized ways. By exploiting the series expansion of products of boson operators regarding collective boson operators, a generalized algorithm for computing permanents is developed that the algorithm can handle the arbitrary matrices with repeated columns and rows. In a particular case, the formula is reduced to Glynn's form. Not only the algorithm can be used for a deterministic direct calculation of the matrix permanent but also can be expressed as a sampling problem like Gurvits's randomized algorithm.

  10. [Permanent education in health: a review].

    Science.gov (United States)

    Miccas, Fernanda Luppino; Batista, Sylvia Helena Souza da Silva

    2014-02-01

    To undertake a meta-synthesis of the literature on the main concepts and practices related to permanent education in health. A bibliographical search was conducted for original articles in the PubMed, Web of Science, LILACS, IBECS and SciELO databases, using the following search terms: "public health professional education", "permanent education", "continuing education", "permanent education health". Of the 590 articles identified, after applying inclusion and exclusion criteria, 48 were selected for further analysis, grouped according to the criteria of key elements, and then underwent meta-synthesis. The 48 original publications were classified according to four thematic units of key elements: 1) concepts, 2) strategies and difficulties, 3) public policies and 4) educational institutions. Three main conceptions of permanent education in health were found: problem-focused and team work, directly related to continuing education and education that takes place throughout life. The main strategies for executing permanent education in health are discussion, maintaining an open space for permanent education , and permanent education clusters. The most limiting factor is mainly related to directly or indirect management. Another highlight is the requirement for implementation and maintenance of public policies, and the availability of financial and human resources. The educational institutions need to combine education and service aiming to form critical-reflexive graduates. The coordination between health and education is based as much on the actions of health services as on management and educational institutions. Thus, it becomes a challenge to implement the teaching-learning processes that are supported by critical-reflexive actions. It is necessary to carry out proposals for permanent education in health involving the participation of health professionals, teachers and educational institutions. To undertake a meta-synthesis of the literature on the main concepts and

  11. Micromachined permanent magnets and their MEMS applications

    Science.gov (United States)

    Cho, Hyoung Jin

    2002-01-01

    In this research, new micromachined permanent magnets have been proposed, developed and characterized for MEMS applications. In realizing micromachined permanent magnets, a new electroplating technique using external magnetic field and a bumper filling technique using a photolithographically defined mold with resin bonded magnetic particles have been developed. The newly developed micromachining techniques allow thick film-type permanent magnet components to be integrated to magnetic MEMS devices with dimensional control and alignment. Permanent magnet arrays with the dimensions ranging from 30 mum to 200 mum have been developed with an energy density up to 2.7 kJ/m3 in precisely defined forms in the micro scale. For the applications of the permanent magnets developed in this work, three novel magnetic MEMS devices such as a bi-directional magnetic actuator, a magnetically driven optical scanner, and a magnetic cell separator have been successfully realized. After design and modeling, each device has been fabricated and fully characterized. The bi-directional actuator with the electroplated permanent magnet array has achieved bi-directional motion clearly and shown good agreement with the analytical and simulated models. The optical scanner has shown linear bi-directional response under static actuation and stable bi-directional scanning performance under dynamic actuation. As a potential BioMEMS application of the developed permanent magnet, the prototype magnetic cell separator using the electroplated permanent magnet strip array has been proposed and demonstrated for magnetic bead patterning. In conclusion, new thick film-type, electroplated CoNiMnP and epoxy resin bonded Sr-ferrite permanent magnets have been developed and characterized, and then, three new magnetic MEMS devices using the permanent magnets such as a bi-directional magnetic actuator, an optical scanner and a magnetic cell separator have been realized in this research. The new micromachined

  12. Design of anti-uplift structure of full circle needle beam formwork trolley for tunnel lining%隧洞衬砌全圆针梁台车抗浮结构设计

    Institute of Scientific and Technical Information of China (English)

    张俊英

    2012-01-01

    The shallow-buried and underground-excavated water conveyance tunnel of the bit section No. 7 of the South Main Canal------an auxiliary project in Beijing for the South Main Canal of the South-to-North Water Transfer Project is a double-route water conveyance tunnel with the nominal diameter(DN) of 3 400 mm, for which the secondary lining is constructed with a full circle needle beam formwork trolley. To deal with the problem from the uplift of the trolley usually occurred during concreting for the lining, a detailed calculation on the anti-uplift of the trolley is made from the very beginning of the design of it. The actual concreting for the lining demonstrates that the anti-uplift device of the trolley can effectively prevent the uplift of it during the construction, and then accumulates some relevant experiences for the similar project in the days to come.%北京市南水北调配套工程南干渠七标浅埋暗挖隧洞为双线DN3 400 mm输水隧洞,其二次衬砌采用全圆式针梁台车施工.为应对台车在浇筑过程中通常会出现的上浮问题,在该台车设计之初便对抗浮进行了细致计算.实际衬砌浇筑证明,该台车抗浮装置可有效地防止其上浮,为以后类似工程积累相关经验.

  13. Sporadic hemiplegic migraine with permanent neurological deficits.

    Science.gov (United States)

    Schwedt, Todd J; Zhou, Jiying; Dodick, David W

    2014-01-01

    By definition, the neurologic impairments of hemiplegic migraine are reversible. However, a few cases of permanent neurologic deficits associated with hemiplegic migraine have been reported. Herein, we present the case of a patient with permanent impairments because of hemiplegic migraine despite normalization of associated brain magnetic resonance imaging abnormalities. Cases like these suggest the need to consider aggressive prophylactic therapy for patients with recurrent hemiplegic migraine attacks.

  14. Macroscopic Simulation of Isotropic Permanent Magnets

    OpenAIRE

    Bruckner, Florian; Abert, Claas; Vogler, Christoph; Heinrichs, Frank; Satz, Armin; Ausserlechner, Udo; Binder, Gernot; Koeck, Helmut; Suess, Dieter

    2015-01-01

    Accurate simulations of isotropic permanent magnets require to take the magnetization process into account and consider the anisotropic, nonlinear, and hysteretic material behaviour near the saturation configuration. An efficient method for the solution of the magnetostatic Maxwell equations including the description of isotropic permanent magnets is presented. The algorithm can easily be implemented on top of existing finite element methods and does not require a full characterization of the...

  15. Quantum Permanents and Hafnians via Pfaffians

    Science.gov (United States)

    Jing, Naihuan; Zhang, Jian

    2016-10-01

    Quantum determinants and Pfaffians or permanents and Hafnians are introduced on the two-parameter quantum general linear group. Fundamental identities among quantum Pf, Hf, and det are proved in the general setting. We show that there are two special quantum algebras among the quantum groups, where the quantum Pfaffians have integral Laurent polynomials as coefficients. As a consequence, the quantum Hafnian is computed by a closely related quantum permanent and identical to the quantum Pfaffian on this special quantum algebra.

  16. Permanent magnet system of alpha magnetic spectrometer

    Institute of Scientific and Technical Information of China (English)

    2000-01-01

    Alpha magnetic spectrometer (AMS) is the first large magnetic spectrometer in space. Its precursor flight was completed successfully in June 1998. The key part of AMS is the permanent magnet system, which was built by the Institute of Electric Engineering, the Institute of High Energy Physics and the Chinese Academy of Launch Vehicle Technology. This system includes a permanent magnet made of high grade NdFeB and a support structure. The unique design of the permanent magnet based on the magic ring fulfills the severe requirements on the magnetic field leakage and the dipole moment for space experiments. The permanent magnet weighs about 2 tons, and provides a geometric acceptance of 0.6 m2 ·sr and an analyzing power BL2 of 0.135 T·m2. It works up to 40℃ without demagnetization. The main structure is a thin double shell, which undergoes the strong magnetic force and torque of the permanent magnet, as well as the large load during launching and landing. The permanent magnet system fulfills the requirements from AMS, and satisfies the strict safety standards of NASA.

  17. Permanent magnet system of alpha magnetic spectrometer

    Institute of Scientific and Technical Information of China (English)

    陈和生

    2000-01-01

    Alpha magnetic spectrometer (AMS) is the first large magnetic spectrometer in space. Its precursor flight was completed successfully in June 1998. The key part of AMS is the permanent magnet system, which was built by the Institute of Electric Engineering, the Institute of High Energy Physics and the Chinese Academy of Launch Vehicle Technology. This system includes a permanent magnet made of high grade NdFeB and a support structure. The unique design of the permanent magnet based on the magic ring fulfills the severe requirements on the magnetic field leakage and the dipole moment for space experiments. The permanent magnet weighs about 2 tons, and provides a geometric acceptance of 0.6 m2·sr and an analyzing power BL2 of 0.135 T·m2. It works up to 40℃ without demagnetization. The main structure is a thin double shell, which undergoes the strong magnetic force and torque of the permanent magnet, as well as the large load during launching and landing. The permanent magnet system fulfills the requirem

  18. Workplace bullying a risk for permanent employees.

    Science.gov (United States)

    Keuskamp, Dominic; Ziersch, Anna M; Baum, Fran E; Lamontagne, Anthony D

    2012-04-01

    We tested the hypothesis that the risk of experiencing workplace bullying was greater for those employed on casual contracts compared to permanent or ongoing employees. A cross-sectional population-based telephone survey was conducted in South Australia in 2009. Employment arrangements were classified by self-report into four categories: permanent, casual, fixed-term and self-employed. Self-report of workplace bullying was modelled using multiple logistic regression in relation to employment arrangement, controlling for sex, age, working hours, years in job, occupational skill level, marital status and a proxy for socioeconomic status. Workplace bullying was reported by 174 respondents (15.2%). Risk of workplace bullying was higher for being in a professional occupation, having a university education and being separated, divorced or widowed, but did not vary significantly by sex, age or job tenure. In adjusted multivariate logistic regression models, casual workers were significantly less likely than workers on permanent or fixed-term contracts to report bullying. Those separated, divorced or widowed had higher odds of reporting bullying than married, de facto or never-married workers. Contrary to expectation, workplace bullying was more often reported by permanent than casual employees. It may represent an exposure pathway not previously linked with the more idealised permanent employment arrangement. A finer understanding of psycho-social hazards across all employment arrangements is needed, with equal attention to the hazards associated with permanent as well as casual employment. © 2012 The Authors. ANZJPH © 2012 Public Health Association of Australia.

  19. EDITORIAL: Permanent revolution - or evolution?

    Science.gov (United States)

    Dobson, Ken

    1998-03-01

    Honorary Editor It was that temporary Bolshevik Leon Trotsky who developed the principle of `permanent revolution', a principle that perhaps characterizes the recent history of education in (south) Britain more than does, say, principles traditionally associated with the Conservative or Labour parties. As this editorial is being written, changes are being made to primary school education, and the long-awaited details of the post-Dearing reorganizing of post-16 education are yet to hit the overful bookshelves and filing cabinets of school heads and examination board officials. But something unique has happened recently which might have surprised even Trotsky. The Secretary of State for Education has set up targets for primary school pupils' attainment and threatened (or promised) to resign if they are not met within the lifetime of our newly elected parliament. Of course, if Mr Blunkett is still in a position to resign at that stage he will have been the longest serving Secretary of State since time immemorial. But we should not carp: this is truly a revolutionary idea. Not the promise to resign - although this idea is not so fashionable now as it once was. The revolutionary idea is that a major change to an educational process is actually being made that carries with it a predicted and testable outcome. By contrast, when school physics was refreshed a generation ago by the introduction of Nuffield courses at both pre- and post-16 stages, no `targets' were set. I and many other physics teachers certainly preferred teaching these to teaching their predecessor syllabuses, and might even dare to assert that the pupils liked them too. But we still don't really know whether or not they learned more - or even better - physics. Very little happened as far as the outside world was concerned: the usual fraction of students gave up physics at the usual ages, and those who were examined didn't really get a better reward for their more up-to-date and more enjoyably learned

  20. Key technology in design and manufacture of formwork jumbo used for horn-shaped portal section of tunnel on passenger-dedicated railway%客运专线隧道喇叭口洞门模板台车设计与制作关键技术

    Institute of Scientific and Technical Information of China (English)

    张刚宏; 袁仁爱

    2015-01-01

    采用喇叭口缓冲式结构洞门是解决客运专线大断面隧道空气动力学效应的主要措施,结合沪昆客专长昆湖南段喇叭口隧道洞门实际情况,重点研究隧道衬砌模板台车设计、制作、安装等关键技术,将原隧道模板台车的门架总成、丝杠支撑总成予以改造,解决了客运专线喇叭口洞门衬砌问题。%Horn-shaped buffer structure portal is the main solution for aerodynamic effect of large section tunnel in passenger-dedicated line. Combining with the actual situation of tunnel horn-shaped portal in Changsha-Kunming Hunan province section of Shanghai-Kunming passenger-dedicated line,this paper studied the design,manufacture and installation key technology for formwork jumbo of tunnel lining and improved the portal assembly and screw support assembly of original tunnel formwork jumbo,which could solve the tunnel horn-shaped portal lining in passenger-dedicated line.

  1. 积石峡水电站导流洞交叉段平顶扭面拱衬砌模板及支撑设计%Concrete Lining Formwork and Support Design for the Flat-twisted Crown of Crossing Section in the Diversion Tunnel of Jishixia Hydropower Station

    Institute of Scientific and Technical Information of China (English)

    吴晓斌; 柳晓龙; 巨金星

    2011-01-01

    The cross section of diversion and middle spillway tunnels in Jishixia Hydropower Station has a complex shape and the crown is a flat-twisted arch as the tangency of two gate-shaped crowns. Because of the narrow construction site and high construction quality requirements, the formwork and support system for the concrete lining of cross section are specially designed as using steel pillars in bottom to support truss beam platform and setting cuplock scaffold on the platform to support crown formwork. The problems in construction are successfully solved and the lining construction is timely completed.%积石峡水电站导流洞与中孔泄洪洞交叉段体形复杂、施工场地狭窄、施工质量要求高,其顶拱形式为两个城门形顶拱相切形成的平顶扭面拱.根据这些特点和施工特殊性,对交叉段模板及支撑系统进行了设计,并采用底部钢管支柱支撑桁架梁平台,平台上搭设碗扣式脚手架支撑顶部模板的施工方案,成功克服了施工中的各种问题,及时有效地完成了衬砌施工.

  2. Safety management of high formwork support system for cast- in- situ buried section in west island tunnel of Hongkong- Zhuhai- Macao Bridge%港珠澳大桥西人工岛现浇隧道暗埋段高大模板支撑体系安全管理

    Institute of Scientific and Technical Information of China (English)

    孟令月; 赵立新

    2015-01-01

    In order to guarantee the construction safety of the buried section in the west island tunnel of Hongkong-Zhuhai-Macao Bridge, combining the construction experience and site construction conditions for box culvert, we used the disk lock steel tubular scaffold as the formwork support trestle and working trestle, it can guarantee the construction safety of the wall and roof. We summarized the construction technology and safety control measures of the new formwork support trestle, and expect that the working experience can be referenced for similar projects.%为确保港珠澳大桥西人工岛隧道暗埋段结构施工安全,结合以往箱涵施工经验及现场施工条件,采用承插型盘扣式钢管支架作为模板支撑架及工作架,有效地保证了墙体、顶板施工安全。对新型模板支撑架施工技术及安全防控措施进行了详细总结,以期为类似工程施工提供借鉴。

  3. Permanent Magnet Eddy Current Loss Analysis of a Novel Motor Integrated Permanent Magnet Gear

    DEFF Research Database (Denmark)

    Zhang, Yuqiu; Lu, Kaiyuan; Ye, Yunyue

    2012-01-01

    In this paper, a new motor integrated permanent magnet gear (MIPMG) is discussed. The focus is on eddy current loss analysis associated to permanent magnets (PMs). A convenient model of MIPMG is provided based on 2-D field-motion coupled time-stepping finite element method for transient eddy...

  4. 31 CFR 515.335 - Permanent resident alien.

    Science.gov (United States)

    2010-07-01

    ... 31 Money and Finance: Treasury 3 2010-07-01 2010-07-01 false Permanent resident alien. 515.335... Definitions § 515.335 Permanent resident alien. As used in § 515.208, the term permanent resident alien means an alien lawfully admitted for permanent residence into the United States. ...

  5. Permanence and global attractivity for Lotka-Volterra difference systems.

    Science.gov (United States)

    Lu, Z; Wang, W

    1999-09-01

    The permanence and global attractivity for two-species difference systems of Lotka-Volterra type are considered. It is proved that a cooperative system cannot be permanent. For a permanent competitive system, the explicit expression of the permanent set E is obtained and sufficient conditions are given to guarantee the global attractivity of the positive equilibrium of the system.

  6. Identification of Transient and Permanent Faults

    Institute of Scientific and Technical Information of China (English)

    李幼仪; 董新洲; 孙元章

    2003-01-01

    A new algorithm was developed for arcing fault detection based on high-frequency current transients analyzed with wavelet transforms to avoid automatic reclosing on permanent faults. The characteristics of arc currents during transient faults were investigated. The current curves of transient and permanent faults are quite similar since current variation from the fault arc is much less than the voltage variation. However, the fault current details are quite different because of the arc extinguishing and reigniting. Dyadic wavelet transforms were used to identify the current variation since wavelet transform has time-frequency localization ability. Many electric magnetic transient program (EMTP) simulations have verified the feasibility of the algorithm.

  7. Permanent isolation surface barrier: Functional performance

    Energy Technology Data Exchange (ETDEWEB)

    Wing, N.R.

    1993-10-01

    This document presents the functional performance parameters for permanent isolation surface barriers. Permanent isolation surface barriers have been proposed for use at the Hanford Site (and elsewhere) to isolate and dispose of certain types of waste in place. Much of the waste that would be disposed of using in-place isolation techniques is located in subsurface structures, such as solid waste burial grounds, tanks, vaults, and cribs. Unless protected in some way, the wastes could be transported to the accessible environment via transport pathways, such as water infiltration, biointrusion, wind and water erosion, human interference, and/or gaseous release.

  8. Treatment of ectopic first permanent molar teeth.

    LENUS (Irish Health Repository)

    Hennessy, Joe

    2012-11-01

    Ectopic eruption of the first permanent molar is a relatively common occurence in the developing dentition. A range of treatment options are available to the clinician provided that diagnosis is made early. Non-treatment can result in premature exfoliation of the second primary molar, space loss and impaction of the second premolar. This paper will describe the management of ectopic first permanent molars, using clinical examples to illustrate the available treatment options. CLINICAL RELEVANCE: This paper is relevant to every general dental practitioner who treats patients in mixed dentition.

  9. Design and construction of permanent magnetic gears

    OpenAIRE

    Jørgensen, Frank Thorleif

    2010-01-01

    This thesis deals with design and development of permanent magnetic gears. The goal of this thesis is to develop knowledge and calculation software for magnetic gears. They use strong NdFeB permanent magnets and a new magnetic gear technology, which will be a serious alternative to classical mechanical gears. The new magnetic gear will have a high torque density1 relationship –high efficiency and are maintenance free. In this project was manufactured two test gears which is tested and verifie...

  10. 模板衬里改善表层混凝土质量的机理研究%Research on Mechanism of Surface Concrete Properties Improved by Controlled Permeable Formwork Liner(CPFL)

    Institute of Scientific and Technical Information of China (English)

    郭保林

    2011-01-01

    Water-retaining ability of impounding type controlled permeable formwork liner(CPFL) under different lateral pressure, water requirement of cement paste and mortar in curing process, and concrete surface hardness at different age were measured, and the mechanism of surface concrete properties improved by CPFL was researched. Test results show that lasting moisture curing of concrete can be realized with impounding type CPFL. The improvement degree of concrete surface hardness at early age is more remarkable than at longer age by using CPFL. In the process of drainage of water and air out of concrete surface, CPFL could impel the finer particles of cementitious materials migrate towards concrete surf ace, make the cementitious materials hydrate fast,and keep moisture of surface concrete for some days, so it can improve the properties of surface concrete.%测试了不同侧压下蓄水型模板衬里的持水能力、水泥净浆及砂浆的养护用水量以及不同龄期混凝土的表面硬度,探讨了模板衬里改善表层混凝土质量的作用机理.结果表明:采用蓄水型模板衬里可实现混凝土的持续保湿养护;模板衬里对早龄期混凝土表面硬度的提高明显高于较长龄期混凝土表面硬度.模板衬里促使排水排气过程中胶凝材料细微颗粒向混凝土表层富集,使得表层混凝土中胶凝材料的早期水化程度高,同时又不间断地保湿养护表层混凝土,从而改善了表层混凝土的质量.

  11. PROCEDURE FOR ESTIMATING PERMANENT TOTAL ENCLOSURE COSTS

    Science.gov (United States)

    The paper discusses a procedure for estimating permanent total enclosure (PTE) costs. (NOTE: Industries that use add-on control devices must adequately capture emissions before delivering them to the control device. One way to capture emissions is to use PTEs, enclosures that mee...

  12. SNO expanded and given permanent status

    CERN Multimedia

    2003-01-01

    The Sudbury Neutrino Observatory (SNO) is being transformed into a permanent international research facility with the assistance of the Canada Foundation for Innovation's International Access Fund. The CFI is providing $38.9 million to establish the new International Facility for Underground Science (1/2 page).

  13. Lowering the Permanent Rate of Unemployment.

    Science.gov (United States)

    Feldstein, Martin S.

    The first section of the study on lowering the permanent rate of unemployment discusses the effects and limitations of increasing aggregate demand through fiscal and monetary policy and indicates the inability to achieve the desired level of unemployment simply by stimulating demand. Section 2 analyzes the characteristics and structure of our…

  14. Permanent magnet motor technology design and applications

    CERN Document Server

    Gieras, Jacek F

    2009-01-01

    Demonstrates the construction of permanent magnet (PM) motor drives and supplies ready-to-implement solutions to common roadblocks along the way. This book also supplies fundamental equations and calculations for determining and evaluating system performance, efficiency, reliability, and cost. It explores modern computer-aided design of PM motors.

  15. Dovetail spoke internal permanent magnet machine

    Science.gov (United States)

    Alexander, James Pellegrino; EL-Refaie, Ayman Mohamed Fawzi; Lokhandwalla, Murtuza; Shah, Manoj Ramprasad; VanDam, Jeremy Daniel

    2011-08-23

    An internal permanent magnet (IPM) machine is provided. The IPM machine includes a stator assembly and a stator core. The stator core also includes multiple stator teeth. The stator assembly is further configured with stator windings to generate a stator magnetic field when excited with alternating currents and extends along a longitudinal axis with an inner surface defining a cavity. The IPM machine also includes a rotor assembly and a rotor core. The rotor core is disposed inside the cavity and configured to rotate about the longitudinal axis. The rotor assembly further includes a shaft. The shaft further includes multiple protrusions alternately arranged relative to multiple bottom structures provided on the shaft. The rotor assembly also includes multiple stacks of laminations disposed on the protrusions and dovetailed circumferentially around the shaft. The rotor assembly further includes multiple pair of permanent magnets for generating a magnetic field, which magnetic field interacts with the stator magnetic field to produce a torque. The multiple pair of permanent magnets are disposed between the stacks. The rotor assembly also includes multiple middle wedges mounted between each pair of the multiple permanent magnets.

  16. Permanent downhole seismic sensors in flowing wells

    NARCIS (Netherlands)

    Jaques, P.; Ong, H.; Jupe, A.; Brown, I.; Jansenns, M.

    2003-01-01

    It is generally accepted that the 'Oilfield of the Future' will incorporate distributed permanent downhole seismic sensors in flowing wells. However the effectiveness of these sensors will be limited by the extent to which seismic signals can be discriminated, or de-coupled, from flow induced

  17. Permanent female mimics in a lekking shorebird

    NARCIS (Netherlands)

    Jukema, Joop; Piersma, Theunis

    2006-01-01

    Female mimics are known from many species, but permanent, non-conditional, alternative mating strategies are only known from an isopod, a fish, a lizard and a bird. The single bird example refers to lek-breeding ruffs Philomachus pugnax, a shorebird for which two strategies (independent and satellit

  18. Permanent isolation surface barrier development plan

    Energy Technology Data Exchange (ETDEWEB)

    Wing, N.R.

    1994-01-01

    The exhumation and treatment of wastes may not always be the preferred alternative in the remediation of a waste site. In-place disposal alternatives, under certain circumstances, may be the most desirable alternatives to use in the protection of human health and the environment. The implementation of an in-place disposal alternative will likely require some type of protective covering that will provide long-term isolation of the wastes from the accessible environment. Even if the wastes are exhumed and treated, a long-term barrier may still be needed to adequately dispose of the treated wastes or any remaining waste residuals. Currently, no {open_quotes}proven{close_quotes} long-term barrier is available. The Hanford Site Permanent Isolation Surface Barrier Development Program (BDP) was organized to develop the technology needed to provide a long-term surface barrier capability for the Hanford Site. The permanent isolation barrier technology also could be used at other sites. Permanent isolation barriers use engineered layers of natural materials to create an integrated structure with redundant protective features. Drawings of conceptual permanent isolation surface barriers are shown. The natural construction materials (e.g., fine soil, sand, gravel, riprap, asphalt) have been selected to optimize barrier performance and longevity. The objective of current designs is to use natural materials to develop a maintenance-free permanent isolation surface barrier that isolates wastes for a minimum of 1,000 years by limiting water drainage to near-zero amounts; reducing the likelihood of plant, animal, and human intrusion; controlling the exhalation of noxious gases; and minimizing erosion-related problems.

  19. Efficient IEC permanent magnet motor; Effizienter IEC Permanent-Magnetmotor (3 kW) - Jahresbericht 2007

    Energy Technology Data Exchange (ETDEWEB)

    Lindegger, M.; Salathe, D.; Biner, H. P.; Evequoz, B.

    2007-07-01

    This annual report for the Swiss Federal Office of Energy (SFOE) takes a look at the work done at the Swiss Universities of Applied Sciences in Lucerne and Valais and the Circle Motor Company in 2007 on the economic feasibility, efficiency and limitations of permanent magnet motors. The higher efficiency of permanent-magnet motors in comparison with asynchronous motors for powers of over 100 kW is noted. Work done on the integration of a 3 kW permanent-magnet motor in an IEC-Standard housing is described. The construction of an efficient permanent magnet motor drive and its testing at the Valais University of Applied Sciences is discussed. The high efficiencies obtained both for the motor and its drive electronics are noted.

  20. Research on low-cyclic load test of large shear span ratio composite shear wall with GHB heat preservation formwork%高剪跨比玻化微珠保温墙模复合剪力墙低周往复荷载试验研究

    Institute of Scientific and Technical Information of China (English)

    李珠; 张婷; 刘元珍

    2013-01-01

    A low-cyclic load test was carried out on large shear span ratio composite shear wall structures with heat preservation formwork by glazed hollow bead (GHB) , which is a kind of new insulation structure system. The test was conducted to compare the performance of composite shear wall and ordinary solid concrete shear wall in terms of bearing capacity, stiffness and ductility. Results show that compared with ordinary solid concrete shear wall, the stiffness of composite shear wall reduces significantly while the bearing capacity reduces about 7%. Composite shear wall is characterized by higher safety reserve and significantly better ductility, which indicates this composite shear wall has greater performance in seismic design. The test results also demonstrate that the formwork of composite shear wall works together with internal concrete as a whole. Study results can be applied in design and performance evaluation of composite shear wall structure with heat preservation formwork.%对保温结构新体系——玻化微珠保温墙模复合剪力墙体系中的高剪跨比剪力墙进行低周往复荷载试验研究.通过对比试验的方法,研究了保温墙模复合剪力墙与普通实体剪力墙在承载力、刚度、延性等方面的性能.试验结果表明:复合剪力墙的承载力较普通剪力墙的仅降低约7%,而刚度却明显减小,既使结构有较高的安全储备,又使延性得到明显改善,该体系在结构抗震方面能发挥较大潜力;墙模与内部混凝土的粘结能力强,共同工作性能良好.研究成果可以作为保温墙模复合剪力墙工作性能评价与工程设计的理论依据.

  1. Hybrid high gradient permanent magnet quadrupole

    Science.gov (United States)

    N'gotta, P.; Le Bec, G.; Chavanne, J.

    2016-12-01

    This paper presents an innovative compact permanent magnet quadrupole with a strong gradient for potential use in future light source lattices. Its magnetic structure includes simple mechanical parts, rectangular permanent magnet blocks and soft iron poles. It has a wide aperture in the horizontal plane to accommodate an x-ray beam port, a common constraint in storage ring-based light sources. This specificity introduces field quality deterioration because of the resulting truncation of the poles; a suitable field quality can be restored with an optimized pole shape. A 82 T /m prototype with a bore radius of 12 mm and a 10 mm vertical gap between poles has been constructed and magnetically characterized. Gradient inhomogeneities better than 10-3 in the good field region were obtained after the installation of special shims.

  2. Design and construction of permanent magnetic gears

    DEFF Research Database (Denmark)

    Jørgensen, Frank Thorleif

    This thesis deals with design and development of permanent magnetic gears. The goal of this thesis is to develop knowledge and calculation software for magnetic gears. They use strong NdFeB permanent magnets and a new magnetic gear technology, which will be a serious alternative to classical...... calculation models for determination of gear output torque from different magnetic gear types are analysed. These analytical calculations models are used together with optimisation tools in order to improve the performance of investigated magnetic gear types. Experimental test gears are designed to validate...... is searched and only a single reference [74] is found and that is why the combination of a cycloidal gear and a magnetic gear are considered as an innovative supplement to magnetic gear technology. A magnetic cycloidal gear is designed with a gearing of 1:21 and a calculated active torque density of 142 [Nm...

  3. Permanence and Community Structure in Complex Networks

    CERN Document Server

    Chakraborty, Tanmoy; Ganguly, Niloy; Mukherjee, Animesh; Bhowmick, Sanjukta

    2016-01-01

    The goal of community detection algorithms is to identify densely-connected units within large networks. An implicit assumption is that all the constituent nodes belong equally to their associated community. However, some nodes are more important in the community than others. To date, efforts have been primarily driven to identify communities as a whole, rather than understanding to what extent an individual node belongs to its community. Therefore, most metrics for evaluating communities, for example modularity, are global. These metrics produce a score for each community, not for each individual node. In this paper, we argue that the belongingness of nodes in a community is not uniform. The central idea of permanence is based on the observation that the strength of membership of a vertex to a community depends upon two factors: (i) the the extent of connections of the vertex within its community versus outside its community, and (ii) how tightly the vertex is connected internally. We discuss how permanence ...

  4. Sensorless Control of Permanent Magnet Synchronous Machines

    DEFF Research Database (Denmark)

    Matzen, Torben N.

    Permanent magnet machines, with either surface mounted or embedded magnets on the rotor, are becoming more common due to the key advantages of higher energy conversion efficiency and higher torque density compared to the classical induction machine. Besides energy efficiency the permanent magnet...... are dependent on the phase currents and rotor position. Based on the flux linkages the differential inductances are determined and used to establish the inductance saliency in terms of ratio and orientation. The orientation and its dependence on the current and rotor position are used to analyse the behaviour...... and establish the suitability of the machine for sensorless control using inductance saliency tracking methods. The same electromagnetic behaviour is used in the implementation of a dynamical simulation model of the machine useful for evaluation of sensorless control methods at the control design stage. Further...

  5. Design of permanent magnetic solenoids for REGAE

    Energy Technology Data Exchange (ETDEWEB)

    Gehrke, Tim; Zeitler, Benno; Gruener, Florian [University of Hamburg and Center for Free-Electron Laser Science, Hamburg (Germany); Floettmann, Klaus [DESY, Hamburg (Germany); Manz, Stephanie [MPSD, University of Hamburg (Germany)

    2013-07-01

    The Relativistic Electron Gun for Atomic Exploration REGAE is a small linear accelerator at DESY in Hamburg, which produces short, low emittance electron bunches. Two future experiments at REGAE, an external injection experiment for Laser Wakefield Acceleration (LWA) and a time resolving Transmission Electron Microscopy (TEM) setup, require strong focusing magnets inside the target chamber. Permanent magnetic solenoids can provide the needed focusing strength due to their enormous surface current density, while having compact dimensions at the same time. Solenoids are fundamentally non-linear focusing elements whose non-linearity is worst for short, strong magnets as required for REGAE. The induced emittance growth is investigated and minimized for different setups with axially and radially magnetized annular magnets. Since permanent magnetic solenoids cannot be switched off but are not needed in every experiment at REGAE, a mechanical lifting-system and a magnetic shielding has to ensure, that the different experiments do not disturb each other.

  6. Robotized Surface Mounting of Permanent Magnets

    Directory of Open Access Journals (Sweden)

    Erik Hultman

    2014-10-01

    Full Text Available Using permanent magnets on a rotor can both simplify the design and increase the efficiency of electric machines compared to using electromagnets. A drawback, however, is the lack of existing automated assembly methods for large machines. This paper presents and motivates a method for robotized surface mounting of permanent magnets on electric machine rotors. The translator of the Uppsala University Wave Energy Converter generator is used as an example of a rotor. The robot cell layout, equipment design and assembly process are presented and validated through computer simulations and experiments with prototype equipment. A comparison with manual assembly indicates substantial cost savings and an improved work environment. By using the flexibility of industrial robots and a scalable equipment design, it is possible for this assembly method to be adjusted for other rotor geometries and sizes. Finally, there is a discussion on the work that remains to be done on improving and integrating the robot cell into a production line.

  7. Secondary cicatricial and other permanent alopecias.

    Science.gov (United States)

    Finner, Andreas M; Otberg, Nina; Shapiro, Jerry

    2008-01-01

    Various nonfollicular scalp conditions can cause secondary scarring or permanent alopecia. Possible causes are congenital defects, trauma, inflammatory conditions, infections, and neoplasms (rarely drugs). Associated signs and symptoms and other diagnostic procedures such as histopathology may aid in the diagnosis. Detection of the underlying disorder may be difficult in end-stage lesions. Treatment is specific for active conditions. Surgery and hair transplantation are options for localized scars.

  8. A Novel Permanent Magnetic Angular Acceleration Sensor

    OpenAIRE

    Hao Zhao; Hao Feng

    2015-01-01

    Angular acceleration is an important parameter for status monitoring and fault diagnosis of rotary machinery. Therefore, we developed a novel permanent magnetic angular acceleration sensor, which is without rotation angle limitations and could directly measure the instantaneous angular acceleration of the rotating system. The sensor rotor only needs to be coaxially connected with the rotating system, which enables convenient sensor installation. For the cup structure of the sensor rotor, it h...

  9. Axial flux permanent magnet brushless machines

    CERN Document Server

    Gieras, Jacek F; Kamper, Maarten J

    2008-01-01

    Axial Flux Permanent Magnet (AFPM) brushless machines are modern electrical machines with a lot of advantages over their conventional counterparts. They are being increasingly used in consumer electronics, public life, instrumentation and automation system, clinical engineering, industrial electromechanical drives, automobile manufacturing industry, electric and hybrid electric vehicles, marine vessels and toys. They are also used in more electric aircrafts and many other applications on larger scale. New applications have also emerged in distributed generation systems (wind turbine generators

  10. U.S. Legal Permanent Residents: Fiscal Year 2012

    Data.gov (United States)

    Department of Homeland Security — A legal permanent resident (LPR) or “green card” recipient is defined by immigration law as a person who has been granted lawful permanent residence in the United...

  11. U.S. Legal Permanent Residents: Fiscal Year 2009

    Data.gov (United States)

    Department of Homeland Security — A legal permanent resident (LPR) or “green card” recipient is defined by immigration law as a person who has been granted lawful permanent residence in the United...

  12. ARE SALAMANDERS USEFUL INDICATORS OF HYDROLOGIC PERMANENCE IN HEADWATER STREAMS?

    Science.gov (United States)

    Regulatory agencies need appropriate indicators of stream permanence to aid in jurisdictional determinations for headwater streams. We evaluated salamanders as permanence indicators because they are often abundant in fishless headwaters. Salamander and habitat data were collect...

  13. U.S. Lawful Permanent Residents: Fiscal Year 2013

    Data.gov (United States)

    Department of Homeland Security — A lawful permanent resident (LPR) or 'green card' recipient is defined by immigration law as a person who has been granted lawful permanent residence in the United...

  14. U.S. Legal Permanent Residents: Fiscal Year 2010

    Data.gov (United States)

    Department of Homeland Security — A legal permanent resident (LPR) or “green card” recipient is defined by immigration law as a person who has been granted lawful permanent residence in the United...

  15. U.S. Legal Permanent Residents: Fiscal Year 2008

    Data.gov (United States)

    Department of Homeland Security — A legal permanent resident (LPR) or “green card” recipient is defined by immigration law as a person who has been granted lawful permanent residence in the United...

  16. U.S. Legal Permanent Residents: Fiscal Year 2011

    Data.gov (United States)

    Department of Homeland Security — A legal permanent resident (LPR) or “green card” recipient is defined by immigration law as a person who has been granted lawful permanent residence in the United...

  17. U.S. Legal Permanent Residents: Fiscal Year 2007

    Data.gov (United States)

    Department of Homeland Security — A legal permanent resident (LPR) or “green card” recipient is defined by immigration law as a person who has been granted lawful permanent residence in the United...

  18. Lower Extremity Permanent Dialysis Vascular Access.

    Science.gov (United States)

    Parekh, Vishal B; Niyyar, Vandana D; Vachharajani, Tushar J

    2016-09-07

    Hemodialysis remains the most commonly used RRT option around the world. Technological advances, superior access to care, and better quality of care have led to overall improvement in survival of patients on long-term hemodialysis. Maintaining a functioning upper extremity vascular access for a prolonged duration continues to remain a challenge for dialysis providers. Frequently encountered difficulties in clinical practice include (1) a high incidence of central venous catheter-related central vein stenosis and (2) limited options for creating a functioning upper extremity permanent arteriovenous access. Lack of surgical skills, fear of complications, and limited involvement of the treating nephrologists in the decision-making process are some of the reasons why lower extremity permanent dialysis access remains an infrequently used option. Similar to upper extremity vascular access options, lower extremity arteriovenous fistula remains a preferred access over arteriovenous synthetic graft. The use of femoral tunneled catheter as a long-term access should be avoided as far as possible, especially with the availability of newer graft-catheter hybrid devices. Our review provides a summary of clinical evidence published in surgical, radiology, and nephrology literature highlighting the pros and cons of different types of lower extremity permanent dialysis access.

  19. Research and Application of the Controlled Permeability Formwork Liner for Improving the Apparent Quality of the Concrete Gradient Surface%透水模板布改善混凝土斜面表观质量的研究与应用

    Institute of Scientific and Technical Information of China (English)

    杨洋

    2014-01-01

    Dalian Xinghai Bay Bridge is three span ground anchored suspension bridge in the north sea environment, and the anchor had complicated structure, large size, and many inclines. In order to fit the high durability requirements of the designer, the control ed permeability formwork liner had been applied successful y besides using the high performance concrete for sea port engineering. That reduced the air bubble and other concrete apparent quality problems, and improved the apparent of the concrete surface. This article has a brief introduction of the test of control ed permeability formwork liner at first, and then expounds the using method , main function, and the key process of quality control, to provide references for the similar projects in the future.%位于北方海洋环境的大连星海湾大桥为三跨地锚式悬索桥,其锚碇上部结构复杂、尺寸大、多斜面。为达到设计高耐久性的要求,除采用海工高性能防腐混凝土外,还在施工中成功应用了透水模板布,消除了斜面上的气泡、麻面等质量通病问题,明显改善了混凝土的表观质量。文章简要介绍了透水模板布工艺试验,并着重阐述了透水模板布的使用工艺、主要功能及质量控制关键,以便今后类似工程参考借鉴。

  20. Hydraulic Self-climbing Formwork Used in Ultra High, Multilayer, More Convex Buttress Tower Construction%液压自爬模在超高、多层、较多外凸扶壁柱井塔施工的应用

    Institute of Scientific and Technical Information of China (English)

    刘銮成

    2013-01-01

      为了满足不断扩大的产能需要,钢筋混凝土框剪结构井塔作为金属、非金属矿业的主提升系统之一,正向超高、多层、较多外凸扶壁方向发展,文章以大截面超高井塔为例介绍电动新型液压自动爬升模板的施工应用技术,阐明井塔爬模系统、施工工艺、施工要点等,起到了节约周材和劳动力、保证施工质量和安全、提高施工效率的良好效果,为今后类同结构工业建筑施工提供了借鉴。%In order to meet the needs of expanding production capacity, reinforced concrete frame structure well tower as metal, not one of the main hoisting system of metal mining, is high, multilayer, more convex buttress direction development, construction technology in large section and super high tower as an example to introduce the electric hydraulic automatic climbing formwork, clarify the well tower climbing formwork system, construction process, construction points, thereby saving material and labor week, to ensure the construction quality and safety, improve the efficiency of construction of good results, provide a reference for the future similar structure of industrial construction.

  1. 77 FR 55895 - Permanent Closure of Cincinnati Blue Ash Airport

    Science.gov (United States)

    2012-09-11

    ... Federal Aviation Administration Permanent Closure of Cincinnati Blue Ash Airport AGENCY: Federal Aviation Administration (FAA), DOT. ACTION: Notice of permanent closure of Cincinnati Blue Ash Airport (ISZ). SUMMARY: The... Cincinnati advising that on August 29, 2012, it was permanently closing Cincinnati Blue Ash Airport...

  2. Permanent magnet design for high-speed superconducting bearings

    Energy Technology Data Exchange (ETDEWEB)

    Hull, John R. (5519 S. Bruner, Hinsdale, IL 60521); Uherka, Kenneth L. (830 Ironwood, Frankfort, IL 60423); Abdoud, Robert G. (13 Country Oaks La., Barrington Hills, IL 60010)

    1996-01-01

    A high temperature superconducting bearing including a permanent magnet rotor levitated by a high temperature superconducting structure. The rotor preferably includes one or more concentric permanent magnet rings coupled to permanent magnet ring structures having substantially triangular and quadrangular cross-sections. Both alternating and single direction polarity magnet structures can be used in the bearing.

  3. 27 CFR 22.68 - Notice of permanent discontinuance.

    Science.gov (United States)

    2010-04-01

    ... 27 Alcohol, Tobacco Products and Firearms 1 2010-04-01 2010-04-01 false Notice of permanent discontinuance. 22.68 Section 22.68 Alcohol, Tobacco Products and Firearms ALCOHOL AND TOBACCO TAX AND TRADE... Permanent Discontinuance of Use of Tax-Free Alcohol § 22.68 Notice of permanent discontinuance. A...

  4. 12 CFR 615.5206 - Permanent capital ratio computation.

    Science.gov (United States)

    2010-01-01

    ... AFFAIRS, LOAN POLICIES AND OPERATIONS, AND FUNDING OPERATIONS Capital Adequacy § 615.5206 Permanent capital ratio computation. (a) The institution's permanent capital ratio is determined on the basis of the... 12 Banks and Banking 6 2010-01-01 2010-01-01 false Permanent capital ratio computation....

  5. 12 CFR 615.5205 - Minimum permanent capital standards.

    Science.gov (United States)

    2010-01-01

    ... AFFAIRS, LOAN POLICIES AND OPERATIONS, AND FUNDING OPERATIONS Capital Adequacy § 615.5205 Minimum permanent capital standards. Each institution shall at all times maintain permanent capital at a level of at... 12 Banks and Banking 6 2010-01-01 2010-01-01 false Minimum permanent capital standards....

  6. Permanent cardiac pacing in pediatric patients.

    Science.gov (United States)

    Lotfy, Wael; Hegazy, Ranya; AbdElAziz, Osama; Sobhy, Rodina; Hasanein, Hossam; Shaltout, Fawzan

    2013-02-01

    Pediatric pacemaker (PM) implants comprise less than 1 % of all PM implants. This study aimed to investigate permanent cardiac pacing among the pediatric population, identifying different indications and complications of pediatric cardiac pacing, especially focusing on the effect of the pacing sites, the PM lead type, and the indications for pacing. The current work is a cross-sectional study of 103 procedures for permanent PM insertion in pediatric patients between January 2001 and December 2010. The patients were followed up 1, 3, and 6 months after implantation, then every 6 months or as needed. Evaluation included routine clinical examination, electrocardiography, chest X-ray, echocardiography, and a full analysis of the pacing system measurements. The ages of the patients ranged from 0.09 to 12 years (median, 2.3 years). The most common indication for pacing was postoperative complete heart bock, noted in 54 patients (52.4 %). Transvenous endocardial PM insertion was performed in 92 procedures (89.3 %), whereas transthoracic epicardial insertion was performed in 11 procedures (10.7 %). The most common site of pacing was the right ventricular apex (n = 64, 62 %), followed by the right ventricular outflow tract (n = 25, 24.3 %). Transthoracic epicardial PM insertion was associated with a significantly higher percentage and greater severity of complications. In this study, 65 % of the patients with left ventricle (LV) dilation before pacing showed a significant improvement in LV dimensions and function after pacing. This was noted only in those with endocardially inserted PM leads in both the congenital and the postoperative groups regardless of the pacing site. Endocardial PM insertion in children is a safe procedure with fewer complications and a lower ventricular threshold than the epicardial route. Permanent single-chamber right ventricle pacing is safe and can lead to significant improvement in LV function and dimensions. However, long-term follow

  7. Deciduous canine and permanent lateral incisor differential root resorption.

    Science.gov (United States)

    Davies, K R; Schneider, G B; Southard, T E; Hillis, S L; Wertz, P W; Finkelstein, M; Hogan, M M

    2001-10-01

    When a permanent maxillary canine erupts apical to the permanent lateral incisor and the deciduous canine, resorption typically takes place only on the deciduous canine root. An understanding of this differential resorption could provide insight into the reasons for excessive iatrogenic root resorption during orthodontic tooth movement. The purpose of the present study was to examine the response of roots of permanent lateral incisors and deciduous canines to simulated resorption, and to acid and enzyme attack, reflecting the physiologic environment of an erupting permanent canine. Groups of maxillary permanent lateral incisor and deciduous canine roots were exposed to 5 combinations of Ten Cate demineralizing solution, Ten Cate demineralizing solution with EDTA, and a Type I collagenase solution. Sections of the roots were examined under a polarized light microscope. Analysis of variation of the resulting root lesions demonstrated that the lesion depths for deciduous canines were greater than those for permanent lateral incisors when averaged across 4 of the conditions (F(1,24) = 7.49, P =.0115). On average, deciduous canine roots demonstrated lesions 10% deeper than did permanent lateral incisor roots. We concluded that when deciduous canine and permanent lateral incisor roots are subjected to acid and enzyme attack, reflecting the physiologic environment of an erupting permanent canine, significantly deeper demineralized lesions are seen in the deciduous roots compared with the permanent roots. This finding may partially explain the differential root resorption during permanent tooth eruption.

  8. Permanent Magnet Eddy Current Loss Analysis of a Novel Motor Integrated Permanent Magnet Gear

    DEFF Research Database (Denmark)

    Zhang, Yuqiu; Lu, Kaiyuan; Ye, Yunyue

    2012-01-01

    In this paper, a new motor integrated permanent magnet gear (MIPMG) is discussed. The focus is on eddy current loss analysis associated to permanent magnets (PMs). A convenient model of MIPMG is provided based on 2-D field-motion coupled time-stepping finite element method for transient eddy...... current analysis. The model takes the eddy current effect of PMs into account in determination of the magnetic field in the air-gap and in the magnet regions. The eddy current losses generated in the magnets are properly interpreted. Design improvements for reducing the eddy current losses are suggested...

  9. Permanent magnetic toroidal drive with half stator

    Directory of Open Access Journals (Sweden)

    Lizhong Xu

    2017-01-01

    Full Text Available A permanent magnetic toroidal drive with a half stator is proposed that avoids noise and mechanical vibrations. The effects of the system parameters on the output torque of the drive were investigated. A model machine was designed and produced. The output torque and speed fluctuation of the drive system were measured, and the calculated and measured output torque were compared. The tests demonstrated that the drive system could operate continuously without noise, and the system achieved a given speed ratio. The drive system had high load-carrying ability and a maximum output torque of 0.15 N m when certain parameter values were used.

  10. Permanent Commission for Health and Safety

    CERN Document Server

    Association du personnel

    2007-01-01

    The mandate of the Staff Association's permanent commission for Health and Safety is to examine all aspects of health and safety related to the working environment at CERN. In no way does it wish to be a substitute for the official bodies that are responsible for these matters. The Commission's aim is to formulate remarks on and make proposals about these questions to the relevant bodies and the CERN Management. Its main focus is the safety of the CERN staff but it is also concerned with the safety of the installations and of the CERN environment. The Commission reports to the Staff Council and the Executive Committee of the Staff Association.

  11. Perlite for permanent confinement of cesium

    Science.gov (United States)

    Balencie, J.; Burger, D.; Rehspringer, J.-L.; Estournès, C.; Vilminot, S.; Richard-Plouet, M.; Boos, A.

    2006-06-01

    We present the potential use of expanded perlite, a metastable amorphous hydrated aluminium silicate, as a permanent medium for the long-term confinement of cesium. The method requires simply a loading by mixing an aqueous cesium nitrate solution and expanded perlite at 300 K followed by densification by sintering. The formation of pollucite, CsAlSi2O6, a naturally occurring mineral phase, upon careful heat treatment is demonstrated by X-ray diffraction. Leaching tests on the resulting glass-ceramics reveal a very low Cs departure of 0.5 mg m-2 d-1.

  12. Recent Advances on Permanent Magnet Machines

    Institute of Scientific and Technical Information of China (English)

    诸自强

    2012-01-01

    This paper overviews advances on permanent magnet(PM) brushless machines over last 30 years,with particular reference to new and novel machine topologies.These include current states and trends for surface-mounted and interior PM machines,electrically and mechanically adjusted variable flux PM machines including memory machine,hybrid PM machines which uniquely integrate PM technology into induction machines,switched and synchronous reluctance machines and wound field machines,Halbach PM machines,dual-rotor PM machines,and magnetically geared PM machines,etc.The paper highlights their features and applications to various market sectors.

  13. Tunable high-gradient permanent magnet quadrupoles

    CERN Document Server

    Shepherd, B J A; Marks, N; Collomb, N A; Stokes, D G; Modena, M; Struik, M; Bartalesi, A

    2014-01-01

    A novel type of highly tunable permanent magnet (PM) based quadrupole has been designed by the ZEPTO collaboration. A prototype of the design (ZEPTO-Q1), intended to match the specification for the CLIC Drive Beam Decelerator, was built and magnetically measured at Daresbury Laboratory and CERN. The prototype utilises two pairs of PMs which move in opposite directions along a single vertical axis to produce a quadrupole gradient variable between 15 and 60 T/m. The prototype meets CLIC's challenging specification in terms of the strength and tunability of the magnet.

  14. Strong permanent magnet-assisted electromagnetic undulator

    Science.gov (United States)

    Halbach, Klaus

    1988-01-01

    This invention discloses an improved undulator comprising a plurality of electromagnet poles located along opposite sides of a particle beam axis with alternate north and south poles on each side of the beam to cause the beam to wiggle or undulate as it travels generally along the beam axis and permanent magnets spaced adjacent the electromagnetic poles on each side of the axis of said particle beam in an orientation sufficient to reduce the saturation of the electromagnet poles whereby the field strength of the electromagnet poles can be increased beyond the normal saturation levels of the electromagnetic poles.

  15. Trading permanent and temporary carbon emissions credits

    Energy Technology Data Exchange (ETDEWEB)

    Marland, Gregg [ORNL; Marland, Eric [Appalachian State University

    2009-08-01

    In this issue of Climatic Change, Van Kooten (2009) addresses an issue that has bedeviled negotiators since the drafting stage of the Kyoto Protocol. If we accept that increasing withdrawals of carbon dioxide from the atmpshere has the same net impact on the climate system as reducing emissions of carbon dioxide to the atmosphere, how do we design a system that allows trading of one for the other? As van Kooten expresses the challenge: 'The problem is that emissions reduction and carbon sequestration, while opposite sides of the same coin in some sense, are not directly comparable, thereby inhibiting their trade in carbon markets.' He explains: 'The difficulty centers on the length of time that mitigation strategies without CO{sub 2} from entering the atmosphere - the duration problem.' While reducing emissions of CO{sub 2} represents an essentially permanent benefit for the atmosphere, capturing CO{sub 2} that has been produced (whether capture is from the atmosphere or directly from, for example, the exhaust from power plants) there is the challenge of storing the carbon adn the risk that it will yet escape to the atmosphere. Permanent benefit to the atmosphere is often not assured for carbon sequestration activities. This is especially true if the carbon is taken up and stored in the biosphere - e.g. in forest trees or agricultural soils.

  16. Permanent Superhumps in V1974 Cyg

    CERN Document Server

    Retter, A; Ofek, E O

    1996-01-01

    We present results of 32 nights of CCD photometry of V1974 Cygni, from the years 1994 and 1995. We verify the presence of two distinct periodicities in the light curve: 0.0812585 day~1.95 hours and 0.0849767 d~2.04 hr. We establish that the shorter periodicity is the orbital period of the underlying binary system. The longer period oscillates with an average value of |dot(P)| ~ 3x10^(7)--typical to permanent superhumps. The two periods obey the linear relation between the orbital and superhump periods that holds among members of the SU Ursae Majoris class of dwarf novae. A third periodicity of 0.083204 d~2.00 hr appeared in 1994 but not in 1995. It may be related to the recently discovered anti-superhump phenomenon. These results suggest a linkage between the classical nova V1974 Cyg and the SU UMa stars, and indicate the existence of an accretion disk and permanent superhumps in the system no later than 30 months after the nova outburst. From the precessing disk model of the superhump phenomenon we estimate ...

  17. Permanent Deformation of Highway Subgrade Soils

    Institute of Scientific and Technical Information of China (English)

    1999-01-01

    Based on a comprehensive review of the literature and preliminary testing performed on a subgrade soil, a testing methodology for repeated load testing was established. This testing protocol was verified using data from subgrade soil. The successful application of this testing protocol on the two subgrade soils proves that it can provide consistent, reliable results. A power model was used to fit the accumulated axial strain over load repetitions with the first hundred cycles excluded from the data set. A number of factors influencing the accumulation of permanent deformation were investigated. The results indicate that confining pressure, load frequency and density are relatively minor contributors to deformation accumulation. Moisture content, deviator stress and first cycle freeze-thaw are major factors governing permanent deformation. The effects of stress history resulting from staged loading are dependent upon the level of applied deviator stress. The interpretation of the rich and consistent deformation data derived from this testing protocol provide valuable insights for transportation engineers relative to the design, construction, operation and maintenance strategy of highway subgrades as well as railway roadbeds.

  18. Permanent Urethrostomy for Treatment of Caprine Hypospadias

    Directory of Open Access Journals (Sweden)

    Omid Azari

    2010-01-01

    Full Text Available Hypospadias, a more extreme form of congenital urethral defect, is seen in young phenotypically male goats. In hypospadias, the urethra remains open on the ventral surface of the penis and is visible externally on the preputial midline. Problem statement: The purpose of this study was to evaluate the surgical treatment outcome in hypopadiac kids. Approach: Thirty six male goat kids with sings of hypospadias were referred to the Animal Hospital of Veterinary Medicine Faculty of Kerman, Iran. The age of patients ranged from one week to 3 months old. The kids were showed symptoms of dysuria and stranguria, during urination. Urine leaked into the subcutaneous tissue of ventral abdominal wall and prepuce. Surgical reconstruction is the only possible therapeutic option for hypospadias. In the current study, permanent urethrostomy operation was carried out for treatment of all kids. Results: Two weeks after surgery the goat kids were in good condition. After 2 months, no significant postoperative complications were observed. Conclusion: Permanent urethrostomy is a reliable technique to treatment of hypospadiac kids.

  19. How Permanent Was Permanent Employment? Patterns of Organizational Mobility in Japan, 1916-1975.

    Science.gov (United States)

    Cheng, Mariah Mantsun; Kalleberg, Arne L.

    1997-01-01

    Work histories from three Japanese mobility surveys were used to measure the extent of permanent employment, finding that historical events and postwar economic development have affected it. Mobility differences were greatest among young workers. White-collar workers in large firms had the lowest mobility, blue-collar, small-firm workers the…

  20. Diagnostics Systems for Permanent Hall Thrusters Development

    Science.gov (United States)

    Ferreira, Jose Leonardo; Soares Ferreira, Ivan; Santos, Jean; Miranda, Rodrigo; Possa, M. Gabriela

    This work describes the development of Permanent Magnet Hall Effect Plasma Thruster (PHALL) and its diagnostic systems at The Plasma Physics Laboratory of University of Brasilia. The project consists on the construction and characterization of plasma propulsion engines based on the Hall Effect. Electric thrusters have been employed in over 220 successful space missions. Two types stand out: the Hall-Effect Thruster (HET) and the Gridded Ion Engine (GIE). The first, which we deal with in this project, has the advantage of greater simplicity of operation, a smaller weight for the propulsion subsystem and a longer shelf life. It can operate in two configurations: magnetic layer and anode layer, the difference between the two lying in the positioning of the anode inside the plasma channel. A Hall-Effect Thruster-HET is a type of plasma thruster in which the propellant gas is ionized and accelerated by a magneto hydrodynamic effect combined with electrostatic ion acceleration. So the essential operating principle of the HET is that it uses a J x B force and an electrostatic potential to accelerate ions up to high speeds. In a HET, the attractive negative charge is provided by electrons at the open end of the Thruster instead of a grid, as in the case of the electrostatic ion thrusters. A strong radial magnetic field is used to hold the electrons in place, with the combination of the magnetic field and the electrostatic potential force generating a fast circulating electron current, the Hall current, around the axis of the Thruster, mainly composed by drifting electrons in an ion plasma background. Only a slow axial drift towards the anode occurs. The main attractive features of the Hall-Effect Thruster are its simple design and operating principles. Most of the Hall-Effect Thrusters use electromagnet coils to produce the main magnetic field responsible for plasma generation and acceleration. In this paper we present a different new concept, a Permanent Magnet Hall

  1. Gating of Permanent Molds for Aluminum Casting

    Energy Technology Data Exchange (ETDEWEB)

    David Schwam; John F. Wallace; Tom Engle; Qingming Chang

    2004-01-01

    This report summarizes a two-year project, DE-FC07-011D13983 that concerns the gating of aluminum castings in permanent molds. The main goal of the project is to improve the quality of aluminum castings produced in permanent molds. The approach taken was to determine how the vertical type gating systems used for permanent mold castings can be designed to fill the mold cavity with a minimum of damage to the quality of the resulting casting. It is evident that somewhat different systems are preferred for different shapes and sizes of aluminum castings. The main problems caused by improper gating are entrained aluminum oxide films and entrapped gas. The project highlights the characteristic features of gating systems used in permanent mold aluminum foundries and recommends gating procedures designed to avoid common defects. The study also provides direct evidence on the filling pattern and heat flow behavior in permanent mold castings. Equipment and procedure for real time X-Ray radiography of molten aluminum flow into permanent molds have been developed. Other studies have been conducted using water flow and behavior of liquid aluminum in sand mold using real time photography. This investigation utilizes graphite molds transparent to X-Rays making it possible to observe the flow pattern through a number of vertically oriented grating systems. These have included systems that are choked at the base of a rounded vertical sprue and vertical gating systems with a variety of different ingates into the bottom of a mold cavity. These systems have also been changed to include gating systems with vertical and horizontal gate configurations. Several conclusions can be derived from this study. A sprue-well, as designed in these experiments, does not eliminate the vena contracta. Because of the swirling at the sprue-base, the circulating metal begins to push the entering metal stream toward the open runner mitigating the intended effect of the sprue-well. Improved designs of

  2. Permanent scatterer InSAR processing: Forsmark

    Energy Technology Data Exchange (ETDEWEB)

    Dehls, John F. [Geological Survey of Norway, Trondheim (Norway)

    2006-04-15

    It has been speculated that slow, aseismic movement may be occurring along some of the fracture zones crosscutting the Forsmark area. The purpose of this study is to determine if it is possible to measure such movement using dInSAR. Differential SAR Interferometry (DInSAR) is a technique that compares the phases of multiple radar images of an area to measure surface change. The method has the potential to detect millimetric surface deformation along the sensor - target line-of-sight. Differences in phase between two images are easily viewed by combining, or interfering, the two phase-images. In the resulting image, the waves will either reinforce or cancel one another, depending upon the relative phases. The resulting image is called an interferogram and contains concentric bands of colour, or fringes, that are related to topography and/or surface deformation. New algorithms use many images acquired over a long time period to determine the movement history of individual objects, referred to as permanent scatterers. In the current project, standard PSInSAR processing was performed on 40 ERS-1 and ERS-2 scenes. The total area processed is approximately 1,500 km{sup 2}. Slightly less than 20,000 permanent scatterers were identified.The highest densities were obtained along the coast and on the islands, where natural outcrops are more abundant. Two main classes of objects act as permanent scatterers in this area. The first are natural reflectors, such as rocks. The second are man-made reflectors, such as parts of buildings. Numerous local movements were found in the study area, relating to building subsidence, or compaction of anthropogenic fill. The dataset was divided into three groups for analysis, based upon the location of regional lineaments provided by SKB. Both statistical and geostatistical techniques were used. The median velocity of the three blocks did not differ by more than 0.2 mm/yr. This is not considered significant, given the possible magnitude of

  3. Paired-permanent approach to valence bond theory

    Institute of Scientific and Technical Information of China (English)

    吴玮; 吴安安; 莫亦荣; 张乾二

    1996-01-01

    A new function called paired-permanent is defined and widely discussed, and a practicable procedure for evaluations of paired-permanents is proposed, which is similar to the Laplace method for determinants. Using the concept of paired-permanents, an efficient algorithm is presented for evaluating the Hamiltonian and overlap matrix elements in the spin-free form of valence bond (VB) theory. With the new algorithm, a spin-free wavefunction is simply written as a paired-permanent, and an overlap matrix element may be obtained by evaluating a corresponding paired-permanent. Meanwhile, the Hamiltonian matrix element is expressed in terms of the summation of the products of electronic integrals and the corresponding sub-paired-permanents

  4. Permanent cortical blindness after bronchial artery embolization.

    Science.gov (United States)

    van Doorn, Colette S; De Boo, Diederick W; Weersink, Els J M; van Delden, Otto M; Reekers, Jim A; van Lienden, Krijn P

    2013-12-01

    A 35-year-old female with a known medical history of cystic fibrosis was admitted to our institution for massive hemoptysis. CTA depicted a hypertrophied bronchial artery to the right upper lobe and showed signs of recent bleeding at that location. Bronchial artery embolization (BAE) was performed with gelfoam slurry, because pronounced shunting to the pulmonary artery was present. Immediately after BAE, the patient developed bilateral cortical blindness. Control angiography showed an initially not opacified anastomosis between the embolized bronchial artery and the right subclavian artery, near to the origin of the right vertebral artery. Cessation of outflow in the bronchial circulation reversed the flow through the anastomosis and allowed for spill of embolization material into the posterior circulation. Unfortunately the cortical blindness presented was permanent.

  5. Hypopigmentation after non-permanent henna tattoo.

    Science.gov (United States)

    Wöhrl, S; Hemmer, W; Focke, M; Götz, M; Jarisch, R

    2001-09-01

    A young girl presented with a hypopigmentation in the shape of the sun. During a holiday in Egypt 3 months before a non-permanent henna tattoo had been applied on her right upper arm. Three to 4 days later there was a severe cutaneous reaction followed by massive swelling of the arm. The lesion took 6 weeks to subside. Patch testing revealed positive reactions to para-phenylenediamine (PPD) but not to henna or any other standard allergen. Especially in Arabic countries PPD is a common additive in natural henna preparations to enhance the weak colouring properties of the natural henna dye. We conclude that henna preparations may contain 'hidden' allergens, such as PPD, which can provoke severe cutaneous reaction without any cosensitization to the henna dye itself.

  6. Distributed generation induction and permanent magnet generators

    CERN Document Server

    Lai, L

    2007-01-01

    Distributed power generation is a technology that could help to enable efficient, renewable energy production both in the developed and developing world. It includes all use of small electric power generators, whether located on the utility system, at the site of a utility customer, or at an isolated site not connected to the power grid. Induction generators (IGs) are the cheapest and most commonly used technology, compatible with renewable energy resources. Permanent magnet (PM) generators have traditionally been avoided due to high fabrication costs; however, compared with IGs they are more reliable and productive. Distributed Generation thoroughly examines the principles, possibilities and limitations of creating energy with both IGs and PM generators. It takes an electrical engineering approach in the analysis and testing of these generators, and includes diagrams and extensive case study examples o better demonstrate how the integration of energy sources can be accomplished. The book also provides the ...

  7. Permanent Cortical Blindness After Bronchial Artery Embolization

    Energy Technology Data Exchange (ETDEWEB)

    Doorn, Colette S. van, E-mail: cvandoorn@gmail.com; De Boo, Diederick W., E-mail: d.w.deboo@amc.uva.nl [Academic Medical Centre, Department of Radiology (Netherlands); Weersink, Els J. M., E-mail: e.j.m.weersink@amc.uva.nl [Academic Medical Centre, Department of Pulmonology (Netherlands); Delden, Otto M. van, E-mail: o.m.vandelden@amc.uva.nl; Reekers, Jim A., E-mail: j.a.reekers@amc.uva.nl; Lienden, Krijn P. van, E-mail: k.p.vanlienden@amc.uva.nl [Academic Medical Centre, Department of Radiology (Netherlands)

    2013-12-15

    A 35-year-old female with a known medical history of cystic fibrosis was admitted to our institution for massive hemoptysis. CTA depicted a hypertrophied bronchial artery to the right upper lobe and showed signs of recent bleeding at that location. Bronchial artery embolization (BAE) was performed with gelfoam slurry, because pronounced shunting to the pulmonary artery was present. Immediately after BAE, the patient developed bilateral cortical blindness. Control angiography showed an initially not opacified anastomosis between the embolized bronchial artery and the right subclavian artery, near to the origin of the right vertebral artery. Cessation of outflow in the bronchial circulation reversed the flow through the anastomosis and allowed for spill of embolization material into the posterior circulation. Unfortunately the cortical blindness presented was permanent.

  8. Permanent junctional reciprocating tachycardia in a dog.

    Science.gov (United States)

    Santilli, Roberto A; Santos, Luis F N; Perego, Manuela

    2013-09-01

    A 5-year-old male English Bulldog was presented with a 1-year history of paroxysmal supraventricular tachycardia (SVT) partially responsive to amiodarone. At admission the surface ECG showed sustained runs of a narrow QRS complex tachycardia, with a ventricular cycle length (R-R interval) of 260 ms, alternating with periods of sinus rhythm. Endocardial mapping identified the electrogenic mechanism of the SVT as a circus movement tachycardia with retrograde and decremental conduction along a concealed postero-septal atrioventricular pathway (AP) and anterograde conduction along the atrioventricular node. These characteristics were indicative of a permanent junctional reciprocating tachycardia (PJRT). Radiofrequency catheter ablation of the AP successfully terminated the PJRT, with no recurrence of tachycardia on Holter monitoring at 12 months follow-up.

  9. Permanent post-partum hypothyroidism. Seven cases

    Energy Technology Data Exchange (ETDEWEB)

    Houdent, C.; Pellenc, P.; Carrara Balacheff, O.; Kuhn, J.M.; Leclerc, P.; Wolf, L.M. (CHU de Rouen, Hopital de Boisguillaume, 76 (France)); Cavelier, B. (Centre de Transfusion Sanguine, 76 - Boisguillaume (France))

    1985-02-09

    Seven cases of hypothyroidism developed within 6 months of delivery are reported. Radioimmunoassays regularly showed very low thyroxin levels and high thyroid-stimulating hormone levels, thus confirming that the thyroid deficiency was of peripheral origin. A significant rise in antimicrosomial or antithyroglobulin antibodies was noted in 5 cases. One patient had HLA-B8 and 4 had HLA-DR3, which was not significantly different from the prevalence in the regional population. In contrast with the transient post-partum hypothyroidism reported mainly in Japan, the condition proved to be permanent in 6 patients followed up for more than two years. The increased frequency of HLA-DR3 and 5 recently described in thyroiditis with transient post-partum thyrotoxicosis was not found in our series. It would appear that pregnancy, which is a period of immune incompetence, may disclose a latent lymphocytic thyroiditis.

  10. Forces between permanent magnets: experiments and model

    Science.gov (United States)

    González, Manuel I.

    2017-03-01

    This work describes a very simple, low-cost experimental setup designed for measuring the force between permanent magnets. The experiment consists of placing one of the magnets on a balance, attaching the other magnet to a vertical height gauge, aligning carefully both magnets and measuring the load on the balance as a function of the gauge reading. A theoretical model is proposed to compute the force, assuming uniform magnetisation and based on laws and techniques accessible to undergraduate students. A comparison between the model and the experimental results is made, and good agreement is found at all distances investigated. In particular, it is also found that the force behaves as r -4 at large distances, as expected.

  11. Temporality and permanence in Romanian public art

    Directory of Open Access Journals (Sweden)

    Maria-Judit Balko

    2015-09-01

    Full Text Available This paper analyzes the relationship between permanent monuments and temporary art projects, as temporality is one of the strategies employed by Romanian artists to counterbalance the support that the Romanian state has shown only towards monuments and memorials dedicated to affirming its value. The complex nature of public art requires a careful consideration of the different dimensions this practice employs, and for that the Western debate on this matter can be a reference point in understanding Romanian public art. We will be looking at possible aspects of the functions of these two main directions in Romanian public art, as they stand methodically one in opposition to the other, in connection with the texts of Piotr Piotrowski (Art and Democracy in Post-communist Europe, 2012 and Boris Groys (Art Power, 2008.

  12. Discrete element modelling of permanent pavement deformation in granular materials

    OpenAIRE

    Cai, Wei

    2015-01-01

    The permanent deformation of a pavement due to vehicle load is one of the important factors affecting the design life as well as the maintenance cost of a pavement. For the purpose of obtaining a cost-effective design, it is advisable to predict the traffic-loadinduced permanent pavement deformation. The permanent deformation in pavements (i.e. rutting) can be classified into three categories, including the wearing of the asphalt layers, compaction, and shear deformations. In the present stud...

  13. Triplication in permanent teeth: A rare case report

    Directory of Open Access Journals (Sweden)

    Nidhi Gera

    2017-01-01

    Full Text Available Fusion is an anomaly manifested in both deciduous and permanent dentitions. Triple tooth refers to the union of three separate tooth entities. It can involve the normal dentition or supernumerary teeth. Triplication is rarely encountered in deciduous and permanent dentition with an incidence of 0.02%. The case presented herein describes a rare case of triplication in permanent maxillary incisors and supernumerary teeth in a 15-year-old female.

  14. A Novel Open-winding Permanent Magnetic Starter-generator

    Institute of Scientific and Technical Information of China (English)

    2011-01-01

    In order to overcome the difficulties of voltage regulation, narrow speed range and low power factor of the traditional permanent magnetic generator applied in the vehicles, a novel open-winding permanent magnetic starter-generator (see Fig.l) is used to widen the speed range and improve the efficiency in the generation mode.

  15. 15 CFR 1180.10 - NTIS permanent repository.

    Science.gov (United States)

    2010-01-01

    ... 15 Commerce and Foreign Trade 3 2010-01-01 2010-01-01 false NTIS permanent repository. 1180.10... ENGINEERING INFORMATION TO THE NATIONAL TECHNICAL INFORMATION SERVICE § 1180.10 NTIS permanent repository. A product, or category of product, will normally be accepted and maintained as part of NTIS'...

  16. Development of traffic induced permanent strain in concrete block pavements

    NARCIS (Netherlands)

    Huurman, M.

    1996-01-01

    Concrete block pavements (c.b.p.) commonly consist of concrete blocks placed over a granular substructure. As a result of wheel load passages permanent strains will slowly develop in the substructure and cause rutting. This paper is about the prediction of the permanent strain development in the sub

  17. Cusp expression of protostylid in deciduous and permanent molars

    Science.gov (United States)

    Moreno, Sandra; Reyes, María Paula; Moreno, Freddy

    2016-01-01

    The present article is a case report on the cusp expression of protostylid in the deciduous inferior molars and in the first permanent inferior molar, in which the correspondence and bilateral symmetry of the mentioned expression can be evidenced, as well as the their relation with the foramen cecum of the mesiobuccal furrows of the deciduous and of the permanent inferior molars. PMID:28123270

  18. 27 CFR 20.68 - Notice of permanent discontinuance.

    Science.gov (United States)

    2010-04-01

    ... 27 Alcohol, Tobacco Products and Firearms 1 2010-04-01 2010-04-01 false Notice of permanent discontinuance. 20.68 Section 20.68 Alcohol, Tobacco Products and Firearms ALCOHOL AND TOBACCO TAX AND TRADE... Qualification of Dealers and Users Permanent Discontinuance of Business § 20.68 Notice of...

  19. Design of permanent magnetic solenoids for REGAE

    Energy Technology Data Exchange (ETDEWEB)

    Gehrke, Tim

    2013-10-15

    The Relativistic Electron Gun for Atomic Exploration (REGAE) is a small linear accelerator at DESY in Hamburg, which produces short, low emittance electron bunches. It is originally designed and built for ultrafast electron diffraction (UED) within the framework of the Center for Free-Electron Laser Science (CFEL). Additionally, two future experiments are planned at REGAE. First, an external injection experiment for Laser Wakefield Acceleration (LWA) will be performed in the framework of the LAOLA collaboration (LAboratory fOr Laser- and beam-driven plasma Acceleration). This experiment will provide a method for the reconstruction of the electric field distribution within a linear plasma wakefield. Second, a time resolving high energy Transmission Electron Microscope (TEM) will be implemented. Among others it is designed to allow for living cell imaging. Both experiments require strong focusing magnets inside the new target chamber at REGAE. Permanent magnetic solenoids (PMSs) can provide the needed focusing strength due to their enormous surface current density, while having compact dimensions at the same time. The present thesis deals with the design of such strong focusing PMSs. Since short and strong solenoids, as required for REGAE, exhibit a distinct non-linearity, the induced emittance growth is relatively large. This emittance growth is investigated and minimized for different set-ups with axially and radially magnetized annular magnets. Furthermore a magnetic shielding is developed. Together with a mechanical lifting system it assures that magnetic leakage fields do not disturb experiments, where the PMSs are removed from the beamline.

  20. Data analysis methods for infrastructure permanent monitoring

    Science.gov (United States)

    Gargaro, Danilo; Rainieri, Carlo; Fabbrocino, Giovanni

    2016-04-01

    Safety and management of road networks is of paramount relevance not only under common operational conditions, but also in the case of extreme events, such as earthquakes or other natural hazards. Structural Health Monitoring systems may represent an attractive option for those institutions and companies having in charge the maintenance. Advances in sensing technology and miniaturization of computational devices make possible and reliable the installation of permanent monitoring systems and bring to operators both local and global data records. In this framework, vibration based monitoring represents an effective tool to track relevant modal properties during time by means of automated procedures. In any case, estimates of modal properties are influenced by environmental and operational factors as well as by the damage pointing out the need of discriminating between the different sources of influence. In the present paper, methodologies and strategies aimed at quantifying the influence of environmental and operational factors on modal parameters of infrastructure components are reviewed and some remarks on the application of blind source separation techniques to this end are proposed.

  1. Relativistic Engine Based on a Permanent Magnet

    CERN Document Server

    Tuval, Miron

    2015-01-01

    Newton's third law states that any action is countered by a reaction of equal magnitude but opposite direction. The total force in a system not affected by external forces is thus zero. However, according to the principles of relativity a signal can not propagate at speeds exceeding the speed of light. Hence the action cannot be generated at the same time with the reaction due to the relativity of simultaneity, thus the total force cannot be null at a given time. The following is a continuation of a previous paper \\cite{Tuval} in which we analyzed the relativistic effects in a system of two current conducting loops. Here the analysis is repeated but one of the loops is replaced by a permanent magnet. It should be emphasized that although momentum can be created in the {\\bf material} part of the system as described in the following work momentum can not be created in the {\\bf physical} system, hence for any momentum that is acquired by matter an opposite momentum is attributed to the electromagnetic field.

  2. Magnetic Performance of a Nanocomposite Permanent Material

    Institute of Scientific and Technical Information of China (English)

    LIU Min; HAN Guang-Bing; GAO Ru-Wei

    2011-01-01

    @@ We build a sandwiched structure model in which the intergranular phase(IP) is homogeneously distributed between soft and hard magnetic grains, and gives a continuously anisotropic expression of the coupling part under the assumption that the IP weakens the intergrain exchange-coupling interaction.Based on the idea that the hardening mechanism is of the pinning type, we calculate the effect of the IP's thickness d and its anisotropy constant K1(0) on the intrinsic coercivity of a nanocomposite permanent material.The calculated results indicate that the domain wall goes twice through irreversible domain wall displacement during the process of moving from soft to hard magnetic grains, and the intrinsic coercivity increases with increasing d, but decreases with increasing K1(0).When d and K1(0) take 2nm and 0.7Kh, respectively, with Kh being the anisotropy constant in the inner part of the hard magnetic grain, the calculated intrinsic coercivity is in good agreement with the experimental data.

  3. A Novel Permanent Magnetic Angular Acceleration Sensor

    Directory of Open Access Journals (Sweden)

    Hao Zhao

    2015-07-01

    Full Text Available Angular acceleration is an important parameter for status monitoring and fault diagnosis of rotary machinery. Therefore, we developed a novel permanent magnetic angular acceleration sensor, which is without rotation angle limitations and could directly measure the instantaneous angular acceleration of the rotating system. The sensor rotor only needs to be coaxially connected with the rotating system, which enables convenient sensor installation. For the cup structure of the sensor rotor, it has a relatively small rotational inertia. Due to the unique mechanical structure of the sensor, the output signal of the sensor can be directed without a slip ring, which avoids signal weakening effect. In this paper, the operating principle of the sensor is described, and simulated using finite element method. The sensitivity of the sensor is calibrated by torsional pendulum and angle sensor, yielding an experimental result of about 0.88 mV/(rad·s−2. Finally, the angular acceleration of the actual rotating system has been tested, using both a single-phase asynchronous motor and a step motor. Experimental result confirms the operating principle of the sensor and indicates that the sensor has good practicability.

  4. Rare earth elements and permanent magnets (invited)

    Science.gov (United States)

    Dent, Peter C.

    2012-04-01

    Rare earth (RE) magnets have become virtually indispensible in a wide variety of industries such as aerospace, automotive, electronics, medical, and military. RE elements are essential ingredients in these high performance magnets based on intermetallic compounds RECo5, RE2TM17 (TM: transition metal), and RE2TM14B. Rare earth magnets are known for their superior magnetic properties—high induction, and coercive force. These properties arise due to the extremely high magnetocrystalline anisotropy made possible by unique 3d-4f interactions between transition metals and rare earths. For more than 40 years, these magnets remain the number one choice in applications that require high magnetic fields in extreme operating conditions—high demagnetization forces and high temperature. EEC produces and specializes in RECo5 and RE2TM17 type sintered magnets. Samarium and gadolinium are key RE ingredients in the powder metallurgical magnet production processes which include melting, crushing, jet milling, pressing, sintering, and heat treating. The magnetic properties and applications of these magnets will be discussed. We will also briefly discuss the past, current, and future of the permanent magnet business. Currently, over 95% of all pure rare earth oxides are sourced from China, which currently controls the market. We will provide insights regarding current and potential new magnet technologies and designer choices, which may mitigate rare earth supply chain issues now and into the future.

  5. Iranian Permanent GPS Network for Geodynamics (IPGN)

    Science.gov (United States)

    Tavakoli, F.; Nankali, H. R.; Sedighi, M.; Djamour, Y.; Mosavi, Z.

    2009-04-01

    Iran is one of the most tectonically active zone in Alpine-Himalayan seismic belt where has been shaken by largely destroying historical and instrumental earthquakes. Iran is located in the convergence zone between Arabia and Eurasia with a velocity of 22 mm/yr nearly to the North. The shortening between Arabian and Eurasian plates in Iran is mainly distributed on Zagros and Alborz belts. Despite the historical and scientific awareness of seismic hazard in Iran, unfortunately this country lacked a Continuous GPS network to study geodynamic and tectonic movements. Such geodetic measurement can play an important role to understand the tectonic deformation then to evaluate the seismic hazard on Iran. Since early 2005 National Cartographic Center of Iran (NCC) is establishing a continuous GPS network named Iranian Permanent GPS Network for Geodynamics (IPGN). Taking into account the number of provided GPS receivers, (108) we made a priority based on two factors of seismicity and population. At the first, in order to study general tectonic behavior in Iran 41 stations, globally distributed in whole of Iran, were been considered. Three other areas in the priority list were: Centeral Alborz, North-West of Iran and North-East of Iran. The rest of receivers, i.e. ~60, were considered for these areas as local networks. These four networks are daily processed and give us a continuous monitoring of any surface deformation. In this paper we try to present the results obtained from the network

  6. From permanent magnets to rechargeable hydride electrodes

    Energy Technology Data Exchange (ETDEWEB)

    Willems, J.J.G.; Buschow, K.H.J.

    1987-02-15

    A brief historical survey is given of how the study of coercitivity mechanisms in SmCo/sub 5/ permanent-magnet materials eventually led to the discovery of the favourable hydrogen sorption properties of the compound LaNi/sub 5/. It is shown how continued research by many investigators dealing with a variety of different physical and chemical properties has resulted in an advanced understanding of some of the principles that govern hydrogen absorption and which are responsible for the changes in physical properties that accompany it. The problems associated with various applications of LaNi/sub 5/-based hydrogen-storage materials are also briefly discussed. A large part of this paper is devoted to the applicability of LaNi/sub 5/-type materials in batteries. Research in this area has resulted in the development of a new type of rechargeable battery: the nickel-hydride cell. This battery can be charged and discharged at high rates and is relatively insensitive to overcharging and overdischarging. Special attention is given to the nature of the electrode degradation process and the effect of composition variations in LaNi/sub 5/-related materials on the lifetime of the corresponding hydride electrodes when subjected to severe electrochemical charge-discharge cycles.

  7. Permanent cardiac pacemaker in infants and children.

    Science.gov (United States)

    Dasmahapatra, H K; Jamieson, M P; Brewster, G M; Doig, B; Pollock, J C

    1986-08-01

    Between October 1970 and November 1984, 26 infants and children aged 11 days to 18 years (mean 5.7 years) received 42 permanent cardiac pacemakers (26 primary implants, 16 re-implants) for congenital or surgically acquired heart block, bradycardia and sinus node dysfunction. Twenty-two patients had unipolar pacing and 4 bipolar pacing. Of 26 primary implantations, 2 had fixed rate epicardial pacing, 16 ventricular demand pacing (13 epicardial, 3 endocardial), 3 epicardial VAT (P-synchronous) pacing and 5 DDD (universal) pacing (4 epicardial, one endocardial). Fourteen patients required a further 19 operations for change of generators (16), ventricular lead (1), generator site (1) and generator encasing (1). Thirty-day hospital mortality was 11.5% (3/26), of which one death was possibly related to pacing failure. Four patients died during the follow-up period (3 months to 10 years; mean 3.4 years). Sixteen of the 19 survivors achieved complete symptomatic relief, without any medical therapy. Our results indicate that modern cardiac pacemaker systems are safe and reliable, and are associated with major relief of symptoms in this age group.

  8. Toward mountains without permanent snow and ice

    Science.gov (United States)

    Huss, M.; Bookhagen, B.; Huggel, C.; Jacobsen, D.; Bradley, R. S.; Clague, J. J.; Vuille, M.; Buytaert, W.; Cayan, D. R.; Greenwood, G.; Mark, B. G.; Milner, A. M.; Weingartner, R.; Winder, M.

    2017-05-01

    The cryosphere in mountain regions is rapidly declining, a trend that is expected to accelerate over the next several decades due to anthropogenic climate change. A cascade of effects will result, extending from mountains to lowlands with associated impacts on human livelihood, economy, and ecosystems. With rising air temperatures and increased radiative forcing, glaciers will become smaller and, in some cases, disappear, the area of frozen ground will diminish, the ratio of snow to rainfall will decrease, and the timing and magnitude of both maximum and minimum streamflow will change. These changes will affect erosion rates, sediment, and nutrient flux, and the biogeochemistry of rivers and proglacial lakes, all of which influence water quality, aquatic habitat, and biotic communities. Changes in the length of the growing season will allow low-elevation plants and animals to expand their ranges upward. Slope failures due to thawing alpine permafrost, and outburst floods from glacier- and moraine-dammed lakes will threaten downstream populations. Societies even well beyond the mountains depend on meltwater from glaciers and snow for drinking water supplies, irrigation, mining, hydropower, agriculture, and recreation. Here, we review and, where possible, quantify the impacts of anticipated climate change on the alpine cryosphere, hydrosphere, and biosphere, and consider the implications for adaptation to a future of mountains without permanent snow and ice.

  9. A Novel Permanent Magnetic Angular Acceleration Sensor.

    Science.gov (United States)

    Zhao, Hao; Feng, Hao

    2015-07-03

    Angular acceleration is an important parameter for status monitoring and fault diagnosis of rotary machinery. Therefore, we developed a novel permanent magnetic angular acceleration sensor, which is without rotation angle limitations and could directly measure the instantaneous angular acceleration of the rotating system. The sensor rotor only needs to be coaxially connected with the rotating system, which enables convenient sensor installation. For the cup structure of the sensor rotor, it has a relatively small rotational inertia. Due to the unique mechanical structure of the sensor, the output signal of the sensor can be directed without a slip ring, which avoids signal weakening effect. In this paper, the operating principle of the sensor is described, and simulated using finite element method. The sensitivity of the sensor is calibrated by torsional pendulum and angle sensor, yielding an experimental result of about 0.88 mV/(rad·s(-2)). Finally, the angular acceleration of the actual rotating system has been tested, using both a single-phase asynchronous motor and a step motor. Experimental result confirms the operating principle of the sensor and indicates that the sensor has good practicability.

  10. Writing on water with permanent markers

    Science.gov (United States)

    Khodaparast, Sepideh; Boulogne, François; Stone, Howard A.

    2016-11-01

    Permanent markers create a continuous thin stain on a surface, which, after drying, can only be removed by high pressure cleaning or organic solvents. The stains of the markers are hydrophobic and thus effectively resist rinsing by water. We introduce a peeling technique based on surface tension, which benefits from this hydrophobicity, to transfer complex two-dimensional marks onto the air-water interface. As an air-water meniscus reaches the stain edge, the surface tension applies a detachment force to the thin layer. If larger than the adhesion of the stain on the substrate, the surface tension can peel off the entire layer. We examine the efficiency of this peeling method for elastic thin films in an experimental model made of thin polystyrene films of well-controlled geometrical properties adhering on clean glass substrates. We investigate the effect of film thickness and interface velocity. At low interface velocities U < 1 mm/s, films of thicknesses down to 50 nm are peeled and transferred to the air-water interface with no defects. Peeling with the meniscus can be used in a large variety of applications such as water-assisted transfer printing, peel-and-stick technologies, cleaning the water proof stains without solvent and fabrication of flexible wearable electronics. This research is supported by Grant from Swiss National Science Foundation (P2ELP2-158896).

  11. Safety effects of permanent running lights for bicycles

    DEFF Research Database (Denmark)

    Madsen, Jens Chr. Overgaard; Andersen, T.; Lahrmann, Harry

    2013-01-01

    3845 cyclists was carried out in Odense, Denmark in order to examine, if permanent running lights mounted to bicycles would improve traffic safety for cyclists. The permanent running lights were mounted to 1845 bicycles and the accident rate was recorded through 12 months for this treatment group...... and 2000 other bicyclists, the latter serving as a control group without bicycle running lights. The safety effect of the running lights is analysed by comparing incidence rates – number of bicycle accidents recorded per man-month – for the treatment group and the control group. The incidence rate......, including all recorded bicycle accidents with personal injury to the participating cyclist, is 19% lower for cyclists with permanent running lights mounted; indicating that the permanent bicycle running light significantly improves traffic safety for cyclists. The study shows that use of permanent bicycle...

  12. Ectopic eruption of permanent incisors after predecessor pulpectomy: five cases.

    Science.gov (United States)

    Tannure, Patricia Nivoloni; Fidalgo, Tatiana Kelly da Silva; Barcelos, Roberta; Gleiser, Rogerio; Primo, Laura Guimaraes

    2011-01-01

    Pulpectomy in primary teeth is a common technique that preserves teeth in the oral environment and maintains or recovers periapical tissues to a healthy condition. This article describes the ectopic eruption of permanent incisors whose primary predecessors underwent pulpectomy using ZOE filler paste. In a group of 135 teeth that received pulpectomy therapy due to caries, 10 primary maxillary incisors had overretention and were followed for at least 3.5 years (mean time of 4.2 years), both clinically and radiographically, until the permanent teeth erupted. The proposed treatment included extraction of the overretained primary incisors based on permanent successor eruption chronology and contralateral eruption. Seven permanent teeth erupted ectopically. Autocorrection of the permanent tooth positions was observed in five cases. It can be concluded that periodic clinical and radiographic assessments are essential to verify radicular and filling paste resorptions and to avoid overretention and any subsequent malocclusion.

  13. Traumatic intrusion of permanent teeth. Part 1. An epidemiological study of 216 intruded permanent teeth.

    Science.gov (United States)

    Andreasen, Jens Ove; Bakland, Leif K; Matras, Rannva C; Andreasen, Francis Meriam

    2006-04-01

    An epidemiological study of traumatic intrusion of permanent teeth was performed on 216 teeth in 151 patients treated over a 50-year period at a major trauma center in Denmark (Copenhagen). This analysis showed that intrusion of permanent teeth was of rare injury only affecting 1.9% of traumatic injuries involving permanent teeth. The main etiologic factor appeared to be falling which resulted in axial impacts on maxillary or mandibular teeth. The most common injury patterns were intrusion without additional injuries (33.5%) and intrusion with crown fractures (60.5%). A few cases were combinations of intrusion and either crown/root-fractures or root fractures (6%). Most often one tooth was intruded (46.3%), followed by two teeth (32.4% ) and three or more teeth (21.3%). The majority of intruded teeth were displaced 2-8 mm. The age group of 6-12 years of age was most frequently involved and boys appeared to experience intrusion injuries more frequently than girls, and at an earlier age. Maxillary central and lateral incisors are the primary victims of intrusions and this seems to be identical to other trauma types and is possibly related to the known exposure to impacts of maxillary incisors. The reliability of clinical findings, such as lack of mobility (81.8%), metallic percussion tone (72.5%), and no pain to percussion (66%) was reasonably high, whereas a radiographic feature such as the obliteration of the periodontal ligament space appeared to be only a partly reliable diagnostic tool (52%).

  14. Factores relacionados con la no participación en el programa de detección precoz de cáncer de mama Factors related to non-participation in a breast cancer early detection program

    Directory of Open Access Journals (Sweden)

    Pilar Barroso García

    2009-02-01

    Full Text Available Objetivo: Conocer las causas de no participación en el Programa de Detección Precoz de Cáncer de Mama (PDPCM en mujeres del Área de Gestión Sanitaria Norte de Almería. Métodos: Estudio de casos y controles. Se eligió una muestra de mujeres invitadas a participar en el PDPCM, entre octubre de 2002 y febrero de 2004. Se recogieron las variables sociodemográficas y las cargas familiares, las variables relacionadas con el programa (conocimiento, accesibilidad, actitudes, los antecedentes familiares y personales, y el estado de salud. Se analizó si había diferencias entre las mujeres que acudieron al programa y las que no, mediante análisis bivariado, y multivariado mediante regresión logística. Se calculó la odds ratio (OR y su intervalo de confianza del 95% (IC95%. Resultados: Se realizaron 720 encuestas 350 casos y 370 controles. Se sustituyó a 291 mujeres (un 40,4% de la muestra. Las variables que de forma independiente se encontraron asociadas a no acudir al programa fueron no recibir carta (OR=11,2; IC95%: 4,6-26,9, haberse realizado mamografía fuera del programa (OR=4,4; IC95%: 2,8-6,9, no tener enfermedades que requieren revisiones médicas (OR=2; IC95%: 1,3-3 y manifestar miedo al resultado de la mamografía (OR=1,8; IC95%: 1,2-2,6. Conclusiones: Se ha encontrado un mayor riesgo de no acudir al programa en las mujeres que no han recibido carta o que tienen una mamografía realizada fuera del programa, y de ahí la necesidad de mejorar la depuración de la base de datos. Hay que seguir divulgando el programa y realizando educación sanitaria en las mujeres con miedo al resultado.Objective: To determine the causes of non-participation in a breast cancer early detection program for women in the northern area of Almería (Spain. Methods: We performed a case-control study. A sample of women included in a breast cancer early detection program between October 2002 and February 2004 was chosen. Participants were interviewed about

  15. Image fusion techniques in permanent seed implantation

    Directory of Open Access Journals (Sweden)

    Alfredo Polo

    2010-10-01

    image fusion for permanent seed implantation.

  16. Permanent superconducting magnets for space applications

    Science.gov (United States)

    Weinstein, Roy

    1994-01-01

    Work has been done to develop superconducting trapped field magnets (TFM's) and to apply them to a bumper-tether device for magnetic docking of spacecraft. The quality parameters for TFM's are J(c), the critical current of the superconductor, and d, the diameter of the superconducting tile. During this year we have doubled d, for production models, from 1 cm to 2 cm. This was done by means of seeding, an improved temperature profile in processing, and the addition of 1 percent Pt to the superconductor chemistry. Using these tiles we have set increasing records for the fields' permanent magnets. Magnets fabricated from old 1 cm tiles trapped 1.52 Tesla at 77K, 4.0T at 65K and 7.0T at 55K. The second of these fields broke a 17 year old record set at Stanford. The third field broke our own record. More recently using 2 cm tiles, we have trapped 2.3T at 77K, and 5.3T at 65K. We expect to trap lOT at 55K in this magnet in the near future. We have also achieved increases in J(c) using a method we developed for seeding U-235, and subsequently bombarding with neutrons. This method doubles J(c). We have not yet fabricated magnets from these tiles. During this year we have increased production yields from 15 percent to 95 percent. We have explored the properties of a magnetic bumper-tether for spacecraft. We have measured the bumper forces, and their dependence on time, distance, and the field of the ordinary ferromagnet (used together with a TFM). We have accounted for 85 percent of the collision energy, and its transformation to magnetic energy and heat energy. We have learned to control the relative bumper and tether forces by controlling TFM and ferromagnetic field strengths.

  17. Metabolic syndrome in permanent night workers.

    Science.gov (United States)

    Biggi, Nicoletta; Consonni, Dario; Galluzzo, Valeria; Sogliani, Marco; Costa, Giovanni

    2008-04-01

    Night and shift work might be risk factors for metabolic and cardiovascular disorders due to interference with diet, circadian metabolic rhythms, and lifestyle. The relationship between permanent night work and metabolic and cardiovascular risk factors was explored in a retrospective longitudinal study of workers employed in a large municipal enterprise in charge of street cleaning and domestic waste collection. All subjects who had worked night shifts between 1976 and 2007 as hand sweepers, motor sweepers, and delivery tricar drivers were compared with subjects who always worked the same jobs but on day shifts. From the periodical medical surveillance files, we identified 488 male workers who had been examined on average five times (minimum 2, maximum 14) during the study period, for a total of 2,328 medical examinations; 157 always had worked day shifts, 12 always the night shift, and 319 both (initially day and subsequently night shifts). Their age ranged from 22 to 62 yrs, and work experience varied from 1 to 28 yrs. Lifestyle habits (smoking, alcohol consumption), body mass index, serum glucose, total cholesterol, tryglicerides, hepatic enzymes, blood pressure, resting electrocardiogram, diabetes, coronary heart disease, hypertension, and related drugs were taken into consideration for the analysis. We used generalized estimating equations (GEE) models (exchangeable correlation matrix) to analyze the relationship between night work and health effects while accounting for within-subject correlations and adjusting for study period, job, age, and lifestyle variables. As a whole, night workers smoked more and had significantly higher BMI, serum total cholesterol, and triglycerides than day workers. Both the inter-individual comparison between day and night workers and the intra-individual comparison among the workers, who were day workers at the beginning of their employment and later became night workers, showed a significant increase in BMI, total cholesterol

  18. ANALYTIC EXPRESSION OF MAGNETIC FIELD DISTRIBUTION OF RECTANGULAR PERMANENT MAGNETS

    Institute of Scientific and Technical Information of China (English)

    苟晓凡; 杨勇; 郑晓静

    2004-01-01

    From the molecular current viewpoint,an analytic expression exactly describing magnetic field distribution of rectangular permanent magnets magnetized sufficiently in one direction was derived from the Biot-Savart's law. This expression is useful not only for the case of one rectangular permanent magnet bulk, but also for that of several rectangular permanent magnet bulks. By using this expression,the relations between magnetic field distribution and the size of rectangular permanent magnets as well as the magnitude of magnetic field and the distance from the point in the space to the top (or bottom) surface of rectangular permanent magnets were discussed in detail. All the calculating results are consistent with experimental ones. For transverse magnetic field which is a main magnetic field of rectangular permanent magnets,in order to describe its distribution,two quantities,one is the uniformity in magnitude and the other is the uniformity in distribution of magnetic field,were defined. Furthermore, the relations between them and the geometric size of the magnet as well as the distance from the surface of permanent magnets were investigated by these formulas. The numerical results show that the geometric size and the distance have a visible influence on the uniformity in magnitude and the uniformity in distribution of the magnetic field.

  19. Fracture in sintered Sm-Co permanent magnetic materials

    Institute of Scientific and Technical Information of China (English)

    LI; Anhua(李安华); DONG; Shengzhi(董生智); LI; Wei(李卫)

    2003-01-01

    The bending strength and fracture toughness of sintered Sm-Co permanent magnetic materials are measured. A scanning electron microscope equipped with an energy dispersive X-ray analysis system is employed to investigate the bending fractography. The fracture behavior and micromechanism are discussed. The fracture behavior of sintered Sm-Co permanent magnetic materials exhibits cleavage fracture. Some Sm-rich impurities are found in fracture plane, suggesting that the Sm-rich impurities help reduce the cleavage brittleness of sintered Sm-Co permanent magnetic materials. The possible methods for improving the strength and toughness are also proposed.

  20. TEM observation of sintered permanent magnetic strontium ferrite

    Institute of Scientific and Technical Information of China (English)

    YU Hongya; LIU Zhengyi; ZENG Dechang

    2006-01-01

    Sintered permanent magnetic strontium ferrites were studied using transmission electron microscopy to investigate the microstructure morphology and its correlation with the magnetic properties. The present study shows that the microstructure of sintered permanent magnetic strontium ferrites is an important parameter in determining their magnetic properties. The microstructure morphology in low-performance ferrite magnet is obviously different from high-performance one. Themagnetic properties of sintered permanent strontium ferrite depend strongly on the orientation degree of strong magnetic crystals. The presence of ferric oxidephase in ferrite magnet can deteriorate the magnetic properties. Moreover, proper quantities of crystal defects are beneficial to high coercive force due to the fixing of magnetic domain.

  1. Forces Between a Permanent Magnet and a Soft Magnetic Plate

    DEFF Research Database (Denmark)

    Beleggia, Marco; Vokoun, David; De Graef, Marc

    2012-01-01

    Forces between a hard/permanent magnet of arbitrary shape and an ideally soft magnetic plate in close proximity are derived analytically from the image method applied to magnetostatics. We found that the contact force, defined as the force required to detach the hard magnet from the plate......, coincides with that between two identical touching permanent magnets. Furthermore, if the hard and the soft magnets are displaced by some amount, their attraction equals that between two identical permanent magnets displaced by twice that amount. Experimental results are presented that validate...

  2. Permanent magnet flux-biased magnetic actuator with flux feedback

    Science.gov (United States)

    Groom, Nelson J. (Inventor)

    1991-01-01

    The invention is a permanent magnet flux-biased magnetic actuator with flux feedback for adjustably suspending an element on a single axis. The magnetic actuator includes a pair of opposing electromagnets and provides bi-directional forces along the single axis to the suspended element. Permanent magnets in flux feedback loops from the opposing electromagnets establish a reference permanent magnet flux-bias to linearize the force characteristics of the electromagnets to extend the linear range of the actuator without the need for continuous bias currents in the electromagnets.

  3. Main Problems Faced by Chinese RE Permanent Magnetic Industry

    Institute of Scientific and Technical Information of China (English)

    2005-01-01

    Under over 50 years' development, Chinese rare earth magnetic industry developed into the global AINiCo, ferrite permanent magnets and NdFeB magnets manufacturing center, and average consumption of magnets per person in China increased to 1.026 tons in 2003 from 0.217 ton in 1990. Although China has been the large producing country of rare earth permanent magnetic materials, to be the strongest one, there are many problems to solve. Main Problems Faced By Chinese Permanent Magnet Industry

  4. Application of permanent magnets in accelerators and electron storage rings

    Science.gov (United States)

    Halbach, K.

    1985-04-01

    The use of permanent-magnet systems in high-energy accelerators and as sources of synchrotron radiation in electron-storage rings is discussed in a review of recent experimental investigations. Consideration is given to the generic advantages of permanent magnets over electromagnets (higher field strength per magnet size) in small-scale configurations; the magnetic properties of some charge-sheet-equivalent-permanent-magnet materials (CSEMs); and the design of pure-CSEM and CSEM-Fe-hybrid multipole magnetic lenses, dipoles, and undulator/wiggler systems for use in free-electron lasers and the production of elliptically polarized synchrotron light. Drawings and diagrams are provided.

  5. Zeons, Permanents, the Johnson Scheme, and Generalized Derangements

    Directory of Open Access Journals (Sweden)

    Philip Feinsilver

    2011-01-01

    Full Text Available Starting with the zero-square “zeon algebra,” the connection with permanents is shown. Permanents of submatrices of a linear combination of the identity matrix and all-ones matrix lead to moment polynomials with respect to the exponential distribution. A permanent trace formula analogous to MacMahon's master theorem is presented and applied. Connections with permutation groups acting on sets and the Johnson association scheme arise. The families of numbers appearing as matrix entries turn out to be related to interesting variations on derangements. These generalized derangements are considered in detail as an illustration of the theory.

  6. Permanent magnet system to guide superparamagnetic particles

    Science.gov (United States)

    Baun, Olga; Blümler, Peter

    2017-10-01

    A new concept of using permanent magnet systems for guiding superparamagnetic nano-particles on arbitrary trajectories over a large volume is proposed. The basic idea is to use one magnet system which provides a strong, homogeneous, dipolar magnetic field to magnetize and orient the particles, and a second constantly graded, quadrupolar field, superimposed on the first, to generate a force on the oriented particles. In this configuration the motion of the particles is driven predominantly by the component of the gradient field which is parallel to the direction of the homogeneous field. As a result, particles are guided with constant force and in a single direction over the entire volume. The direction is simply adjusted by varying the angle between quadrupole and dipole. Since a single gradient is impossible due to Gauß' law, the other gradient component of the quadrupole determines the angular deviation of the force. However, the latter can be neglected if the homogeneous field is stronger than the local contribution of the quadrupole field. A possible realization of this idea is a coaxial arrangement of two Halbach cylinders. A dipole to evenly magnetize and orient the particles, and a quadrupole to generate the force. The local force was calculated analytically for this particular geometry and the directional limits were analyzed and discussed. A simple prototype was constructed to demonstrate the principle in two dimensions on several nano-particles of different size, which were moved along a rough square by manual adjustment of the force angle. The observed velocities of superparamagnetic particles in this prototype were always several orders of magnitude higher than the theoretically expected value. This discrepancy is attributed to the observed formation of long particle chains as a result of their polarization by the homogeneous field. The magnetic moment of such a chain is then the combination of that of its constituents, while its hydrodynamic radius

  7. 76 FR 48058 - Effective Date of Requirement for Premarket Approval for Cardiovascular Permanent Pacemaker...

    Science.gov (United States)

    2011-08-08

    ... Approval for Cardiovascular Permanent Pacemaker Electrode AGENCY: Food and Drug Administration, HHS. ACTION... the following class III preamendments device: Cardiovascular permanent pacemaker electrode. The Agency... permanent pacemaker electrode based on new information. This action implements certain statutory...

  8. Adjustable permanent magnet assembly for NMR and MRI

    Science.gov (United States)

    Pines, Alexander; Paulsen, Jeffrey; Bouchard, Louis S; Blumich, Bernhard

    2013-10-29

    System and methods for designing and using single-sided magnet assemblies for magnetic resonance imaging (MRI) are disclosed. The single-sided magnet assemblies can include an array of permanent magnets disposed at selected positions. At least one of the permanent magnets can be configured to rotate about an axis of rotation in the range of at least +/-10 degrees and can include a magnetization having a vector component perpendicular to the axis of rotation. The single-sided magnet assemblies can further include a magnet frame that is configured to hold the permanent magnets in place while allowing the at least one of the permanent magnets to rotate about the axis of rotation.

  9. Estimates of the Legal Permanent Resident Population: 2009

    Data.gov (United States)

    Department of Homeland Security — This report presents estimates of the legal permanent resident (LPR) population living in the United States on January 1, 2009. The LPR population includes persons...

  10. Estimates of the Legal Permanent Resident Population: 2012

    Data.gov (United States)

    Department of Homeland Security — This report presents estimates of the legal permanent resident (LPR) population living in the United States on January 1, 2012. The LPR population includes persons...

  11. Single Phase Permanent Magnet Low Speed Synchronous Motor

    Directory of Open Access Journals (Sweden)

    Gao Lianxue

    2013-04-01

    Full Text Available In order to acquire a better cognition to the single phase permanent magnet low speed synchronous motor and validate the correctness of the motor mathematical model, the performances of the motor are tested with the single phase permanent magnet low speed synchronous motor whose type is 70TDY4, the corresponding simulations are done too. The resistance and the inductance of the single phase permanent magnet low speed synchronous motor are measured. According to the data of experiments and simulations, the static characteristics of the single phase permanent magnet low speed synchronous motor with the changes of the phase shift resistance and the phase shift capacitance are analysed, the results of experiments and simulations prove the correctness of the mathematics model.

  12. Estimates of the Legal Permanent Resident Population: 2011

    Data.gov (United States)

    Department of Homeland Security — This report presents estimates of the legal permanent resident (LPR) population living in the United States on January 1, 2011. The LPR population includes persons...

  13. U.S. Legal Permanent Residents: Fiscal Year 2006

    Data.gov (United States)

    Department of Homeland Security — Every year, hundreds of thousands of persons become legal permanent residents (LPRs) or “green card” recipients of the United States. LPRs, as defined by immigration...

  14. Permanent deformation behavior of naturally occurring bituminous sands

    CSIR Research Space (South Africa)

    Anochie-Boateng, Joseph

    2008-01-01

    Full Text Available were compacted close to field densities and then tested for permanent deformation at two temperatures using a newly proposed test procedure. The procedure applied stress states and ratios determined from field-loading characteristics of haul trucks...

  15. HYPODONTIA OF PERMANENT TEETH IN A KENYAN POPULATION

    African Journals Online (AJOL)

    Of the children with hypodontia, about 80 % lacked one or two teeth, 54 % had ... of patients prior to removal of permanent teeth for orthodontic reasons. INTRODUCTION .... (iv) extraction of the primary teeth followed by immediate orthodontic ...

  16. Design of Permanent Magnet Synchronous Generators for Wave Power Generation

    Institute of Scientific and Technical Information of China (English)

    方红伟; 王丹

    2016-01-01

    In this paper, a design method for ocean wave permanent magnet synchronous generator(PMSG)is proposed with new performance criteria to obtain better output performance at the cost of less permanent magnet material. Besides, a simple equivalent analytical geometry method is put forward to calculate the sizes of permanent magnets. Based on geometric and electromagnetic models, four types of rotor structures are compared, i.e., embed-ded, tangential, tile surface mount and convex surface mount structures. The designs and comparisons of machine are performed with the same permanent magnet volume. Moreover, the influences of mechanical pole-arc coeffi-cient of tile surface mount PMSG on electrical efficiency, output power, material corrosion, core loss, and torque ripple are investigated. Finite-element analysis method is applied to verify the results using Ansoft/Maxwell.

  17. Comment on "Permanent Electric Dipole Moment of an Rb Atom"

    Institute of Scientific and Technical Information of China (English)

    朱振和

    2003-01-01

    It is stated that the conjecture that the hydrogen-like atoms may have large permanent electric dipole moments is doubtable. Two kinds of experiments are suggested to check the reliability of the conjecture further.

  18. Permanent-wave dermatitis: contact allergy to cysteamine hydrochloride.

    Science.gov (United States)

    Landers, Maeran C; Law, Sandra; Storrs, Frances J

    2003-09-01

    Cysteamine hydrochloride (CHC) is a newly recognized sensitizer found in permanent-wave solutions. We report the case of a hairdresser who was found to be allergic to CHC. Our allergic patient was patch-tested to various chemicals found in permanent-wave solutions, including CHC (1.0% in petrolatum). Patch-test reactions were positive to CHC, glyceryl thioglycolate, diglyceryl thioglycolate, p-phenylenediamine (PPD), and PPD through a piece of latex glove. Sixty-four controls to CHC (1.0% in petrolatum) had negative results. Household-weight latex gloves were protective against CHC allergy. Persons with CHC-waved hair were not allergic. CHC contained in "neutral" permanent-wave preparations has been used in American beauty salons since 1993. We briefly discuss the introduction and significance of CHC in permanent waves.

  19. Analysis of Permanent Magnets Bearings in Flywheel Rotor Designs

    Directory of Open Access Journals (Sweden)

    Prince Owusu-Ansah

    2016-04-01

    Full Text Available This paper discusses analysis of permanent magnet bearing in flywheel rotor designs. This work focuses on the advantages of using permanent magnets in flywheel rotor design as compared to that of the convectional mode of levitating the rotor position. The use of permanent magnet in magnetic bearing design to generate the steady state position of the magnetic field results in less variation of the force exerted on the rotor when it deviates from the nominal position than when an electrical coil is used for the same purpose. Theresults of the analysis shows that the magnetic bearing dynamics as well as its load carryingcapacity improves when the rotor is offset from its central position. The use of permanent magnet compared to current-carrying coils results in smaller overall size of magnetic bearing leading to a more compact system design resulting in improved rotordynamic performance

  20. Thermal stability and nova cycles in permanent superhump systems

    CERN Document Server

    Retter, A

    2000-01-01

    Archival data on permanent superhump systems are compiled to test the thermal stability of their accretion discs. We find that their discs are almost certainly thermally stable as expected. This result confirms Osaki's suggestion (1996) that permanent superhump systems form a new subclass of cataclysmic variables (CVs), with relatively short orbital periods and high mass transfer rates. We note that if the high accretion rates estimated in permanent superhump systems represent their mean secular values, then their mass transfer rates cannot be explained by gravitational radiation, therefore, either magnetic braking should be extrapolated to systems below the period gap or they must have mass transfer cycles. Alternatively, a new mechanism that removes angular momentum from CVs below the gap should be invoked. We suggest applying the nova cycle scenarios offered for systems above the period gap to the short orbital period CVs. Permanent superhumps have been observed in the two non-magnetic ex-novae with binary...

  1. PERMANENCE AND PERSISTENCE OF TIME VARYING LOTKA-VOLTERRA SYSTEMS

    Institute of Scientific and Technical Information of China (English)

    2006-01-01

    In this article, the permanence and persistence for three classes time varying Lotka-Volterra ecological system are investigated by using Lyapunov stability analysis and constructing the compact set of attraction. Some examples are given to illustrate the theorems.

  2. Permanent components of the crust, geoid and ocean depth tides

    Science.gov (United States)

    Sun, Wenke; Sjöberg, Lars E.

    2001-04-01

    The tidal deformation caused by the luni-solar potential includes not only a periodic part, but also a time-independent part, called the permanent tide. How to deal with the tidal correction in gravimetric observations, especially the treatment of the permanent tide, has been discussed for a long time, since some practical and physical problems exist anyhow. A resolution adopted by IAG (1983) was that the permanent tidal attraction of the Moon and the Sun should be eliminated, but the permanent tidal deformation of the Earth be maintained. This is called zero gravity, and the geoid associated with it is the zero geoid. As to the crust deformation, Poutanen et al. (Poutanen, M., Vermeer, M., Mäkinen, J., 1996. The permanent tide in GPS positioning. Journal of Geodesy 70, 499-504.) suggested that co-ordinates should be reduced to the zero crust, i.e. the crust that includes the effect of the permanent tide. This research shows that horizontal components of the permanent earth tides, which are not considered in recent studies, are also important in GPS positioning and geoid determination. Since the tide-generating potential can be expanded into harmonics and divided into two parts (geodetic coefficients and the group of harmonic waves), the permanent earth tides can be easily obtained by multiplying the amplitude of the zero-frequency wavelength by the corresponding geoid geodetic coefficient. Formulas for both elastic and fluid cases are presented. Numerical results for the elastic case show that he vertical permanent crust (zero crust), geoid and ocean depth tides reach -12.0, -5.8 and 6.1 cm at the poles, and 5.9, 2.9 and -3.0 cm at the equator, respectively. The horizontal permanent crust, geoid and ocean depth tide components reach as much as 2.5, 8.7 and 6.3 cm, respectively. According to the solution of IAG (1983), the permanent vertical components are kept in GPS positioning and geoid computation. Thus, it is natural to include the horizontal components

  3. Forces between arrays of permanent magnets of basic geometric shapes

    DEFF Research Database (Denmark)

    Vokoun, D.; Beleggia, Marco

    2014-01-01

    We provide formulas for evaluating the magnetic force between two permanent magnet arrays, regularly spaced over a square lattice. We focus on three basic shapes of magnets constituting the arrays: cylinder, sphere and rectangular prism. When the lattice parameter is large, the expressions can...... be used to calculate the force between two single magnets in a computationally efficient way. The calculations are validated experimentally by measuring the attraction force between two single permanent magnets, where we demonstrate a fair agreement within about 15%....

  4. Passive control of Permanent Magnet Synchronous Motor chaotic systems

    Institute of Scientific and Technical Information of China (English)

    QI Dong-lian; WANG Jia-jun; ZHAO Guang-zhou

    2005-01-01

    Permanent Magnet Synchronous Motor model can exhibit a variety of chaotic phenomena under some choices of system parameters and external input. Based on the property of passive system, the essential conditions were studied, by which Permanent Magnet Synchronous Motor chaotic system could be equivalent to passive system. Using Lyapunov stability theory, the convergence condition deciding the system's characters was discussed. In the convergence condition area, the equivalent passive system could be globally asymptotically stabilized by smooth state feedback.

  5. Summary on Sensorless permanent magnet Brushless DC Motor Control Strategies

    OpenAIRE

    Li Hai Xia; Cao Yang

    2016-01-01

    This paper aims at discussing the development process and application of permanent magnet brushless DC motor. By referring to the related literatures, this thesis gives an overview of several common non-position sensor detection technologies, analyzing their strengths and weaknesses as well as a number of new and improved methods in practical applications. Besides, The application situation of the electric door with sensorless permanent magnet brushless DC motor was illustrated.

  6. Permanent magnet quadrupoles for the CLIC Drive Beam decelerator

    CERN Document Server

    Shepherd, Ben; Collomb, Norbert

    2012-01-01

    STFC in collaboration with CERN has developed a new type of adjustable permanent magnet based quadrupole for the CLIC Drive Beam Decelerator. It uses vertical movement of the permanent magnets to achieve an integrated gradient range of 3.6-14.6T, which will allow it to be used for the first 60% of the decelerator line. Construction of a prototype of this magnet has begun; following this, it will be measured magnetically at CERN and Daresbury Laboratory.

  7. The orthodontic extraction of permanent molars: a literature review.

    Science.gov (United States)

    Chua, Emilia S L; Felicita, A Sumathi

    2015-05-01

    The most common cause of dental crowding is the presence of an arch-length--tooth-size discrepancy. Conventional methods of gaining space in orthodontics involve the extraction of teeth, often premolars. However, there are a number of clinical situations in which the extraction of permanent molars might be considered. This paper highlights the indications, advantages, disadvantages and timing of the extraction of the first, second and third permanent molars in the treatment of a crowded malocclusion.

  8. Lunar magnetic field - Permanent and induced dipole moments

    Science.gov (United States)

    Russell, C. T.; Coleman, P. J., Jr.; Schubert, G.

    1974-01-01

    Apollo 15 subsatellite magnetic field observations have been used to measure both the permanent and the induced lunar dipole moments. Although only an upper limit of 1.3 x 10 to the 18th gauss-cubic centimeters has been determined for the permanent dipole moment in the orbital plane, there is a significant induced dipole moment which opposes the applied field, indicating the existence of a weak lunar ionosphere.

  9. A facial talon cusp on maxillary permanent central incisors

    Directory of Open Access Journals (Sweden)

    Suneelkumar Chinni

    2012-01-01

    Full Text Available Talon cusp is a dental anomaly that occurs as an accessory cusp like structure, from the cingulum of maxillary and mandibular anterior teeth. Lingual location is usually considered pathognomic. This case report discuss about the unusual appearance of talon cusp on the facial surface of the maxillary left permanent central incisor and a mild talon cusp on the facial surface of the maxillary right permanent central incisor.

  10. Summary on Sensorless permanent magnet Brushless DC Motor Control Strategies

    Directory of Open Access Journals (Sweden)

    Li Hai Xia

    2016-01-01

    Full Text Available This paper aims at discussing the development process and application of permanent magnet brushless DC motor. By referring to the related literatures, this thesis gives an overview of several common non-position sensor detection technologies, analyzing their strengths and weaknesses as well as a number of new and improved methods in practical applications. Besides, The application situation of the electric door with sensorless permanent magnet brushless DC motor was illustrated.

  11. Advanced optimization of permanent magnet wigglers using a genetic algorithm

    Energy Technology Data Exchange (ETDEWEB)

    Hajima, Ryoichi [Univ. of Tokyo (Japan)

    1995-12-31

    In permanent magnet wigglers, magnetic imperfection of each magnet piece causes field error. This field error can be reduced or compensated by sorting magnet pieces in proper order. We showed a genetic algorithm has good property for this sorting scheme. In this paper, this optimization scheme is applied to the case of permanent magnets which have errors in the direction of field. The result shows the genetic algorithm is superior to other algorithms.

  12. Dynamic Risk Analysis of Permanent Deformation of Sea Embankment

    Institute of Scientific and Technical Information of China (English)

    高玉峰; 刘汉龙; 余湘娟

    2001-01-01

    For evaluation of the permanent deformation of a sea embankment under stochastic earthquake excitation, a robust dynamic risk analytical method is presented based on conventional permanent deformation analysis and stochastic seismic response analysis. This method can predict not only the mean value of maximum permanent deformation but also the reliability corresponding to different deformation control standards. The earthquake motion is modelled as a stationary Gaussian filtered white noise random process. The predicted average maximum horizontal permanent displacement is in agreement with the conventional result. Further studied are the reliability of permanent deformation due to stochastic wave details at one seismic motion level and the risk of permanent deformation due to stochastic seismic strength, i. e., the maximum acceleration in a long period. Therefore, it is possible to make the optimal design in terms of safety and economy according to the importance of a sea embankment. It is suggested that the improved stochastic seismic model that can catch the behavior of the non-stationary random process for sea embankments should be further studied in future.

  13. New perspectives about molecular arrangement of primary and permanent dentin

    Energy Technology Data Exchange (ETDEWEB)

    Sanches Borges, Ana Flavia [Department of Dental Materials at Piracicaba Dental School, State University of Campinas, Piracicaba, SP (Brazil); Andrade Bitar, Renata [Biomedical Engineering, Valley of Paraiba University (UNIVAP) (Brazil); Kantovitz, Kamila Rosamilia [Department of Pediatric Dentistry at Piracicaba Dental School, State University of Campinas, Piracicaba, SP (Brazil); Bortollazo Correr, Americo [Department of Dental Materials at Piracicaba Dental School, State University of Campinas, Piracicaba, SP (Brazil); Martin, Airton Abrahao [Biomedical Engineering Post Graduation, Valley of Paraiba University (UNIVAP) (Brazil); Puppin-Rontani, Regina Maria [Department of Pediatric Dentistry at Piracicaba Dental School, State University of Campinas, Piracicaba, SP (Brazil)], E-mail: rmpuppin@fop.unicamp.br

    2007-12-30

    The dentin quality of primary and permanent teeth was inspected by Fourier transformed Raman spectroscopy (FT-Raman); scanning electron microscopy/energy-dispersive spectroscopy (SEM/EDS) and hardness test. Middle dentin of crowns were reached by carbide bur abrading providing a uniform smear layer. Phosphoric acid was applied in order to simulate the etching of total etching adhesive systems. The groups were (n = 10): G1 (primary dentin smear layer); G2 (35% phosphoric acid etched primary dentin); G3 (permanent dentin smear layer); G4 (35% phosphoric acid etched permanent dentin). FT-Raman results were subjected to cluster analysis. SEM/EDS were made in order to add the data obtained by FT-Raman. The hardness data were subjected to ANOVA and Tukey test. FT-Raman showed differences among groups, either to organic or inorganic content. For the organic content, primary and permanent dentin became similar after the etching; conversely, the inorganic content showed differences for the two substrates. Hardness test showed no significant differences between primary and permanent dentin, before or after etching, but the etching decreased these values. The mineral content arrangement of primary dentin is different from permanent dentin, independently of the etching. The substrate type did no influence the hardness, but the etching decreased it.

  14. 76 FR 53851 - Effective Date of Requirement for Premarket Approval for Cardiovascular Permanent Pacemaker...

    Science.gov (United States)

    2011-08-30

    ... Approval for Cardiovascular Permanent Pacemaker Electrode; Correction AGENCY: Food and Drug Administration... development protocol for the class III preamendments device: Cardiovascular permanent pacemaker electrode. The...

  15. Robust discrimination of permanent scatterers using Cameron Decomposition

    Science.gov (United States)

    Kouroupis, G.; Elias, P.; Anastassopoulos, V.

    2014-10-01

    One of the main difficulties encountered in Differential Interferometry (DInSAR) applications is temporal and spatial decorrelation over time. Single pixels, called Permanent Scatterers (PS), overcome this difficulty since they are coherent over time and over wide look-angle variations. Permanent Scatterers identification using interferographic techniques is unfeasible since they require the use of many acquisitions. Samsonov and Tiampo have presented a technique that selects Permanent Scatterers by analyzing their Polarization Phase Difference (PPD). The PPD approach would work just fine looking for single bounce scatterers because they are invariant to any initial arbitrary rotation between the scatterer and the radar Line of Sight (LOS). We propose to replace the PPD technique with Cameron's Coherent Target Decomposition (CTD) because it is more accurate in finding the single and double bounce scatterers as it eliminates the initial orientation angle of the scatterer. Additionally, Cameron's CTD is capable of recognizing more scattering mechanisms which means that more pixels, depending on their amplitude and stability over time, can be classified as Permanent Scatterers. A sample scene of fully polarimetric SAR image depicting the San Francisco bay was employed for experimentation. Our results demonstrate the superiority of the Cameron's CTD approach compared to PPD's approach for the selection of pixels classified as Permanent Scatterers.

  16. Biodentine Pulpotomy in Mature Permanent Molar: A Case Report

    Science.gov (United States)

    2016-01-01

    Irreversible pulpitis is the most common reason for endodontic treatment in primary and permanent teeth. Root canal therapy and extraction are the two viable and most documented treatment options for the same. Studies with regards to management of mature permanent teeth with carious exposure and treatment with vital pulp therapies such as adult permanent tooth pulpotomy are scarce. However, permanent tooth pulpotomy with the new calcium-silicate based cements (Mineral Trioxide Aggregate and Biodentine) can help preserve the tooth pulp vitality and promote healing and repair foregoing the more invasive root canal therapy procedure. A 12-year old male patient with irreversible pulpitis in right mandibular first permanent molar was treated with complete coronal pulpotomy with placement of Biodentine in the pulp chamber and a full coronal coverage using stainless steel crown. Clinical and radiographic examinations were performed at three, six, twelve and eighteen months. At the end of 18 months, the patient was completely asymptomatic and the tooth was free of any clinical and radiographic signs of inflammation and infection. PMID:27630966

  17. Biodentine Pulpotomy in Mature Permanent Molar: A Case Report.

    Science.gov (United States)

    Soni, Harleen Kaur

    2016-07-01

    Irreversible pulpitis is the most common reason for endodontic treatment in primary and permanent teeth. Root canal therapy and extraction are the two viable and most documented treatment options for the same. Studies with regards to management of mature permanent teeth with carious exposure and treatment with vital pulp therapies such as adult permanent tooth pulpotomy are scarce. However, permanent tooth pulpotomy with the new calcium-silicate based cements (Mineral Trioxide Aggregate and Biodentine) can help preserve the tooth pulp vitality and promote healing and repair foregoing the more invasive root canal therapy procedure. A 12-year old male patient with irreversible pulpitis in right mandibular first permanent molar was treated with complete coronal pulpotomy with placement of Biodentine in the pulp chamber and a full coronal coverage using stainless steel crown. Clinical and radiographic examinations were performed at three, six, twelve and eighteen months. At the end of 18 months, the patient was completely asymptomatic and the tooth was free of any clinical and radiographic signs of inflammation and infection.

  18. Permanent and temporary pacemaker implantation after orthotopic heart transplantation

    Directory of Open Access Journals (Sweden)

    Bacal Fernando

    2000-01-01

    Full Text Available PURPOSE:To determine the indication for and incidence and evolution of temporary and permanent pacemaker implantation in cardiac transplant recipients. METHODS: A retrospective review of 114 patients who underwent orthotopic heart transplantation InCor (Heart Institute USP BR between March 1985 and May 1993. We studied the incidence of and indication for temporary pacing, the relationship between pacing and rejection, the need for pemanent pacing and the clinical follow-up. RESULTS: Fourteen of 114 (12%heart transplant recipients required temporary pacing and 4 of 114 (3.5% patients required permanent pacing. The indication for temporary pacing was sinus node dysfunction in 11 patients (78.5% and atrioventricular (AV block in 3 patients (21.4%. The indication for permanent pacemaker implantation was sinus node dysfunction in 3 patients (75% and atrioventricular (AV block in 1 patient (25%. We observed rejection in 3 patients (21.4% who required temporary pacing and in 2 patients (50% who required permanent pacing. The previous use of amiodarone was observed in 10 patients (71.4% with temporary pacing. Seven of the 14 patients (50% died during follow-up. CONCLUSION: Sinus node dysfunction was the principal indication for temporary and permanent pacemaker implantation in cardiac transplant recipients. The need for pacing was related to worse prognosis after cardiac transplantation.

  19. The Public Service Bargains of Danish Permanent Secretaries

    DEFF Research Database (Denmark)

    Hansen, Morten Balle; Salomonsen, Heidi Houlberg

    2011-01-01

    permanent secretaries primarily reflects elements of a managerial role as prescribed in many of the New Public Management reforms or whether their role as policy adviser is as important as their role as manager, as is formally prescribed. The PSB is assessed in terms of the typology of Hood and Lodge......, including the dimensions: reward, competency, loyalty and responsibility. The analysis demonstrates that although elements of a managerial bargain have entered the role of Danish permanent secretaries, it is not more salient than the advisory aspect of the PSB.......Danish permanent secretaries, top civil servants in the Danish state administration, are formally both administrative heads of their ministries as well as prime advisers to Danish ministers. In this article we analyse whether and how the public service bargain (PSB) (Hood and Lodge, 2006) of Danish...

  20. Improved Design of Hoisting Equipment with Permanent Magne

    Directory of Open Access Journals (Sweden)

    S. S. Stoyanova

    2010-01-01

    Full Text Available Hoisting equipment for lifting ferromagnetic loads can be designed while using electromagnets and permanent magnets. The second variant finds wider application due to great successes in creation of hard magnetic materials and significantly less electric power consumption. A shortcoming of this design is in the fact that under operational conditions magnetization and demagnetization processes take place in magnetic circuits with various magnetic resistance due to differences in the attracted loads. The proposed design presupposes that load attraction and lowering are controlled without magnetization and demagnetization of the permanent magnet. This effect is achieved by the following way: a strict permanent magnetic flux is directed to a ferromagnetic load or the flux is deviated from it.

  1. Two cylinder permanent magnet stirrer for liquid metals

    Science.gov (United States)

    Bojarevičs, A.; Baranovskis, R.; Kaldre, I.; Milgrāvis, M.; Beinerts, T.

    2017-07-01

    To achieve a uniform liquid metal composition and temperature distribution, stirring is often necessary for industrial processes. Here, a novel permanent magnet system for liquid melt stirring is proposed. It promises very low energy consumption and options for multiple different flow types compared to traditional travelling magnetic field inductors or mechanical stirrers. The proposed system has a simple design: it consists of two rotating permanent magnet cylinders, which are magnetized transversely to the axis of the cylinders. The experimental device was developed and tested under various regimes using GaInSn alloy in a cylindrical crucible. Aluminum stirring by permanent magnets in laboratory scale is tested, and stirring impact on directional solidification of metallic alloys is experimentally investigated.

  2. Sealants for preventing dental decay in the permanent teeth

    DEFF Research Database (Denmark)

    Ahovuo-Saloranta, Anneli; Forss, Helena; Walsh, Tanya

    2013-01-01

    in preventing caries in children and adolescents when compared to no sealants. Their effectiveness may be related to the caries prevalence in the population. OBJECTIVES: To compare the effects of different types of fissure sealants in preventing caries in permanent teeth in children and adolescents. SEARCH...... of age. DATA COLLECTION AND ANALYSIS: Two review authors independently screened search results, extracted data and assessed trial quality. We calculated the odds ratio (OR) for caries or no caries on occlusal surfaces of permanent molar teeth. For trials with a split-mouth design, the Becker...... or the baseline caries prevalence.- Resin-based sealant compared with no sealant: Compared to control without sealant, second or third or fourth generation resin-based sealants prevented caries in first permanent molars in children aged 5 to 10 years (at 2 years of follow-up odds ratio (OR) 0.12, 95% confidence...

  3. Design Study Of Cyclotron Magnet With Permanent Magnet

    Science.gov (United States)

    Kim, Hyun Wook; Chai, Jong Seo

    2011-06-01

    Low energy cyclotrons for Positron emission tomography (PET) have been wanted for the production of radio-isotopes after 2002. In the low energy cyclotron magnet design, increase of magnetic field between the poles is needed to make a smaller size of magnet and decrease power consumption. The Permanent magnet can support this work without additional electric power consumption in the cyclotron. In this paper the study of cyclotron magnet design using permanent magnet is shown and also the comparison between normal magnet and the magnet which is designed with permanent magnet is shown. Maximum energy of proton is 8 MeV and RF frequency is 79.3 MHz. 3D CAD design was done by CATIA P3 V5 R18 [1] and the All field calculations had been performed by OPERA-3D TOSCA [2]. The self-made beam dynamics program OPTICY [3] is used for making isochronous field and other calculations.

  4. Permanent magnet with MgB2 bulk superconductor

    Science.gov (United States)

    Yamamoto, Akiyasu; Ishihara, Atsushi; Tomita, Masaru; Kishio, Kohji

    2014-07-01

    Superconductors with persistent zero-resistance currents serve as permanent magnets for high-field applications requiring a strong and stable magnetic field, such as magnetic resonance imaging. The recent global helium shortage has quickened research into high-temperature superconductors (HTSs)—materials that can be used without conventional liquid-helium cooling to 4.2 K. Herein, we demonstrate that 40-K-class metallic HTS magnesium diboride (MgB2) makes an excellent permanent bulk magnet, maintaining 3 T at 20 K for 1 week with an extremely high stability (cryocoolers, making MgB2 bulks promising for the next generation of Tesla-class permanent-magnet applications.

  5. Special-Purpose High-Torque Permanent-Magnet Motors

    Science.gov (United States)

    Doane, George B., III

    1995-01-01

    Permanent-magnet brushless motors that must provide high commanded torques and satisfy unusual heat-removal requirement are developed. Intended for use as thrust-vector-control actuators in large rocket engines. Techniques and concepts used to design improved motors for special terrestrial applications. Conceptual motor design calls for use of rotor containing latest high-energy-product rare-earth permanent magnets so that motor produces required torque while drawing smallest possible currents from power supply. Torque generated by electromagnetic interaction between stator and permanent magnets in rotor when associated electronic circuits applied appropriately temporally and spatially phased currents to stator windings. Phase relationships needed to produce commanded torque computed in response to torque command and to electronically sensed angular position of rotor relative to stator.

  6. Dynamic Analysis of Permanent Magnet Synchronous Generator with Power Electronics

    Directory of Open Access Journals (Sweden)

    OZCIRA, S.

    2010-05-01

    Full Text Available Permanent magnet DC motor-generators (PMDC, PMSG have been widely used in industrial and energy sectors recently. Power control of these systems can be achieved by controlling the output voltage. In this study, PMDC-PMSG systems are mathematically modeled and simulated in MATLAB and Simulink software. Then the results are discussed. A low power permanent magnet synchronous generator is driven by a permanent magnet DC motor and the output voltage is controlled by a frequency cycle-converter. The output of a half-wave uncontrolled rectifier is applied to an SPWM inverter and the power is supplied to a 300V, 50Hz load. The load which is connected to an LC filter is modeled by state-space equations. LC filter is utilized in order to suppress the voltage oscillations at the inverter output.

  7. Asynchronous slip-ring motor synchronized with permanent magnets

    Directory of Open Access Journals (Sweden)

    Glinka Tadeusz

    2017-03-01

    Full Text Available The electric LSPMSM motor presented in the paper differs from standard induction motor by rotor design. The insulated start-up winding is located in slots along the rotor circumference. The winding ends are connected to the slip-rings. The rotor core contains permanent magnets. The electromechanical characteristics for synchronous operation were calculated, as were the start-up characteristics for operation with a short-circuited rotor winding. Two model motors were used for the calculations, the V-shaped Permanent Magnet (VPM – Fig. 3, and the Linear Permanent Magnet (IPM – Fig. 4, both rated at 14.5 kW. The advantages of the investigated motor are demonstrated in the conclusions.

  8. First permanent molar root development arrest associated with compound odontoma.

    Science.gov (United States)

    Gunda, Sachin A; Patil, Anil; Varekar, Aniruddha

    2013-07-04

    Trauma or infection to the primary tooth may have deleterious effects on the underlying developing tooth buds. Anatomically the root apices of primary teeth are in close proximity to the developing permanent tooth buds; hence spread of infection originating from pulp necrosis of primary tooth may not only affect the underlying tooth bud but may also affect the adjacent tooth buds. The extent of malformation depends on the developmental stage of tooth or the age of patient. Presented here is a rare case of complete arrest of maxillary first permanent molar root growth due to spread of periapical infection originating from second primary molar leading to failure of its eruption and finally extraction. Histopathlogical analysis revealed compound odontoma associated with maxillary first permanent molar.

  9. Is longer sevoflurane preconditioning neuroprotective in permanent focal cerebral ischemia?

    Institute of Scientific and Technical Information of China (English)

    Caiwei Qiu; Bo Sheng; Shurong Wang; Jin Liu

    2013-01-01

    Sevoflurane preconditioning has neuroprotective effects in the cerebral ischemia/reperfusion model. However, its influence on permanent cerebral ischemia remains unclear. In the present study, the rats were exposed to sevoflurane for 15, 30, 60, and 120 minutes, fol owed by induction of perma-nent cerebral ischemia. Results demonstrated that 30-and 60-minute sevoflurane preconditioning significantly reduced the infarct volume at 24 hours after cerebral ischemia, and 60-minute lurane preconditioning additional y reduced the number of TUNEL-and caspase-3-positive cel s in the ischemic penumbra. However, 120-minute sevoflurane preconditioning did not show evident neuroprotective effects. Moreover, 60-minute sevoflurane preconditioning significantly attenuated neurological deficits and infarct volume in rats at 4 days after cerebral ischemia. These findings in-dicated that 60-minute sevoflurane preconditioning can induce the best neuroprotective effects in rats with permanent cerebral ischemia through the inhibition of apoptosis.

  10. Proposal of Permanent Magnet Repulsive Maglev Transportation System

    Science.gov (United States)

    Moriyama, Shin-Ichi

    This paper describes a maglev transportation system for automobile. The track is an array of permanent magnet blocks, and the levitating body is the bedplate which consists of permanent magnet plates, propulsion coils, levitation coils and guidance coils. The feature of this system is that the automobile equipped with the bedplate is free to approach into the track or to swerve from the track by using four wheels with the lift. The force acting on the levitating body is calculated on the assumption that each permanent magnet can be expressed as a surface current. From the calculation results, it is proven that the automobile of 4.35m length, 1.8m width and 1700kg weight can run at speed of 500km/h against the air resistance force of 3704N on the condition that the battery has an output of 337.5V and a capacity of 190Ah.

  11. Rotor for a line start permanent magnet machine

    Energy Technology Data Exchange (ETDEWEB)

    Melfi, Mike; Schiferl, Rich; Umans, Stephen

    2017-07-11

    A rotor comprises laminations with a plurality of rotor bar slots with an asymmetric arrangement about the rotor. The laminations also have magnet slots equiangularly spaced about the rotor. The magnet slots extend near to the rotor outer diameter and have permanent magnets disposed in the magnet slots creating magnetic poles. The magnet slots may be formed longer than the permanent magnets disposed in the magnets slots and define one or more magnet slot apertures. The permanent magnets define a number of poles and a pole pitch. The rotor bar slots are spaced from adjacent magnet slots by a distance that is at least 4% of the pole pitch. Conductive material is disposed in the rotor bar slots, and in some embodiments, may be disposed in the magnet slot apertures.

  12. Globally Optimal Segmentation of Permanent-Magnet Systems

    DEFF Research Database (Denmark)

    Insinga, Andrea Roberto; Bjørk, Rasmus; Smith, Anders

    2016-01-01

    Permanent-magnet systems are widely used for generation of magnetic fields with specific properties. The reciprocity theorem, an energy-equivalence principle in magnetostatics, can be employed to calculate the optimal remanent flux density of the permanent-magnet system, given any objective...... functional that is linear in the magnetic field. This approach, however, yields a continuously varying remanent flux density, while in practical applications, magnetic assemblies are realized by combining uniformly magnetized segments. The problem of determining the optimal shape of each of these segments...

  13. Permanent Electric Dipole Moment of an Rb Atom

    Institute of Scientific and Technical Information of China (English)

    黄湘友; 游佩林

    2002-01-01

    We experimentally determine the conjecture that hydrogen-like atoms such as Rb and Cs may have large permanent electric dipole moments (EDMs). The saturated Rb vapour fills a cylindrical capacitor in the experiment.The influence of the vapour dielectric medium on capacitance is measured with a digital capacitance meter. Supposing that the measurement influence comes from the permanent EDMs of Rb atoms, from the experimental result we find that the EDM is large, i.e. dRb ≥ 8.6e × 10-9 cm.

  14. Mesiodistal crown diameters of permanent dentition in schoolchildren from Lima

    OpenAIRE

    Pineda-Mejia, Martha; Departamento Académico de Estomatología Rehabilitadora, Facultad Odontología de la Universidad Nacional Mayor de San Marco, Perú.; Petkova- Gueorguieva, Marieta; Facultad Odontología de la Universidad Nacional Mayor de San Marcos.

    2015-01-01

    The purpose of this study was to determine the size of mesiodistal diameters of permanent teeth in a school population of the city of Lima, to analyze the differences between homologous teeth, sexual dimorphism of permanent teeth as well as the degree of variability of the measurements. Methodology: The study was conducted on 400 students of mestizos (200 men and 200 women) 10 to 12 years, from three schools in the districts of la Victoria and Barrios Altos, Lima city. The procedure was perfo...

  15. Development of traffic induced permanent strain in concrete block pavements

    OpenAIRE

    1996-01-01

    Concrete block pavements (c.b.p.) commonly consist of concrete blocks placed over a granular substructure. As a result of wheel load passages permanent strains will slowly develop in the substructure and cause rutting. This paper is about the prediction of the permanent strain development in the substructure and the associated rutting on the basis of the results of repeated load triaxial tests and analytical models. By discussing the behaviour of three c.b.p.'s it is shown that insight into c...

  16. Magnetostatic interactions and forces between cylindrical permanent magnets

    Energy Technology Data Exchange (ETDEWEB)

    Vokoun, David [Institute of Physics ASCR, v.v.i., Prague (Czech Republic)], E-mail: vokoun@fzu.cz; Beleggia, Marco [Institute for Materials Research, University of Leeds, Leeds LS2 9JT (United Kingdom); Heller, Ludek; Sittner, Petr [Institute of Physics ASCR, v.v.i., Prague (Czech Republic)

    2009-11-15

    Permanent magnets of various shapes are often utilized in magnetic actuators, sensors or releasable magnetic fasteners. Knowledge of the magnetic force is required to control devices reliably. Here, we introduce an analytical expression for calculating the attraction force between two cylindrical permanent magnets on the assumption of uniform magnetization. Although the assumption is not fulfilled exactly in cylindrical magnets, we obtain a very good agreement between the calculated and measured forces between two identical cylindrical magnets and within an array of NdFeB cylindrical magnets.

  17. Magnetostatic interactions and forces between cylindrical permanent magnets

    Science.gov (United States)

    Vokoun, David; Beleggia, Marco; Heller, Luděk; Šittner, Petr

    2009-11-01

    Permanent magnets of various shapes are often utilized in magnetic actuators, sensors or releasable magnetic fasteners. Knowledge of the magnetic force is required to control devices reliably. Here, we introduce an analytical expression for calculating the attraction force between two cylindrical permanent magnets on the assumption of uniform magnetization. Although the assumption is not fulfilled exactly in cylindrical magnets, we obtain a very good agreement between the calculated and measured forces between two identical cylindrical magnets and within an array of NdFeB cylindrical magnets.

  18. Permanent bending and alignment of ZnO nanowires.

    Science.gov (United States)

    Borschel, Christian; Spindler, Susann; Lerose, Damiana; Bochmann, Arne; Christiansen, Silke H; Nietzsche, Sandor; Oertel, Michael; Ronning, Carsten

    2011-05-06

    Ion beams can be used to permanently bend and re-align nanowires after growth. We have irradiated ZnO nanowires with energetic ions, achieving bending and alignment in different directions. Not only the bending of single nanowires is studied in detail, but also the simultaneous alignment of large ensembles of ZnO nanowires. Computer simulations reveal how the bending is initiated by ion beam induced damage. Detailed structural characterization identifies dislocations to relax stresses and make the bending and alignment permanent, even surviving annealing procedures.

  19. Permanent bending and alignment of ZnO nanowires

    Energy Technology Data Exchange (ETDEWEB)

    Borschel, Christian; Spindler, Susann; Oertel, Michael; Ronning, Carsten [Institut fuer Festkoerperphysik, Friedrich-Schiller-Universitaet Jena, Max-Wien-Platz 1, 07743 Jena (Germany); Lerose, Damiana [MPI fuer Mikrostrukturphysik, Weinberg 2, 06120 Halle/Saale (Germany); Institut fuer Photonische Technologien, Albert-Einstein-Strasse 9, 07745 Jena (Germany); Bochmann, Arne [Institut fuer Photonische Technologien, Albert-Einstein-Strasse 9, 07745 Jena (Germany); Christiansen, Silke H. [Institut fuer Photonische Technologien, Albert-Einstein-Strasse 9, 07745 Jena (Germany); MPI fuer die Physik des Lichts, Guenther-Scharowsky-Str. 1, 91058 Erlangen (Germany); Nietzsche, Sandor [Zentrum fuer Elektronenmikroskopie, Friedrich-Schiller-Universitaet Jena, Ziegelmuehlenweg 1, 07743 Jena (Germany)

    2011-07-01

    Ion beams can be used to bend or re-align nanowires permanently, after they have been grown. We have irradiated ZnO nanowires with ions of different species and energy, achieving bending and alignment in various directions. We study the bending of single nanowires as well as the simultaneous alignment of large ensembles of ZnO nanowires in detail. Computer simulations show that the bending is initiated by ion beam induced damage. Dislocations are identified to relax stresses and make the bending and alignment permanent and resistant against annealing procedures.

  20. Miniature high speed compressor having embedded permanent magnet motor

    Science.gov (United States)

    Zhou, Lei (Inventor); Zheng, Liping (Inventor); Chow, Louis (Inventor); Kapat, Jayanta S. (Inventor); Wu, Thomas X. (Inventor); Kota, Krishna M. (Inventor); Li, Xiaoyi (Inventor); Acharya, Dipjyoti (Inventor)

    2011-01-01

    A high speed centrifugal compressor for compressing fluids includes a permanent magnet synchronous motor (PMSM) having a hollow shaft, the being supported on its ends by ball bearing supports. A permanent magnet core is embedded inside the shaft. A stator with a winding is located radially outward of the shaft. The PMSM includes a rotor including at least one impeller secured to the shaft or integrated with the shaft as a single piece. The rotor is a high rigidity rotor providing a bending mode speed of at least 100,000 RPM which advantageously permits implementation of relatively low-cost ball bearing supports.

  1. Analysis and Design of Hybrid Excitation Permanent Magnet Synchronous Generators

    Institute of Scientific and Technical Information of China (English)

    JIN Wan-bing; ZHANG Dong; AN Zhong-liang; TAN Ren-yuan

    2006-01-01

    On the basis of a conventional permanent magnet (PM) synchronous generator's construction,a novel kind of Hybrid Excitation Permanent Magnet Synchronous Generator (HEPMSG) is introduced by inserting exciting winding in the stator or rotor.Firstly,the construction of HEPMSG is improved with the addition of PM excitation on the ferromagnetic pole,and its working principle and design method are studied in detail.Then,an appropriate exciting current control system is presented considering the characteristics of HEPMSG.Finally,a prototype is made,and test results confirm the analysis and design.

  2. Comparing superconducting and permanent magnets for magnetic refrigeration

    DEFF Research Database (Denmark)

    Bjørk, Rasmus; Nielsen, Kaspar Kirstein; Bahl, C. R. H.

    2016-01-01

    We compare the cost of a high temperature superconducting (SC) tape-based solenoidwith a permanent magnet (PM) Halbach cylinder for magnetic refrigeration.Assuming a five liter active magnetic regenerator volume, the price of each type ofmagnet is determined as a function of aspect ratio of the r......We compare the cost of a high temperature superconducting (SC) tape-based solenoidwith a permanent magnet (PM) Halbach cylinder for magnetic refrigeration.Assuming a five liter active magnetic regenerator volume, the price of each type ofmagnet is determined as a function of aspect ratio...

  3. Multipactor Mitigation in Coaxial Lines by Means of Permanent Magnets

    CERN Document Server

    Gonzalez-Iglesias, D; Anza, S; Vague, J; Gimeno, B; Boria, V E; Raboso, D; Vicente, C; Gil, J; Caspers, F; Conde, L

    2014-01-01

    The main aim of this paper is the analysis of the feasibility of employing permanent magnets for the multipactor mitigation in a coaxial waveguide. First, the study of a coaxial line immersed in a uniform axial magnetic field shows that multipactor can be suppressed at any RF frequency if the external magnetic field is strong enough. Both theoretical simulations and experimental tests validate this statement. Next, multipactor breakdown of a coaxial line immersed in a hollow cylindrical permanent magnet is analyzed. Numerical simulations show that multipactor can be suppressed in a certain RF frequency range. The performed experimental test campaign demonstrates the capability of the magnet to avoid the multipactor electron multiplication process.

  4. Permanent magnets in accelerators can save energy, space and cost

    DEFF Research Database (Denmark)

    Bødker, F.; Baandrup, L.O.; Hauge, N.

    2013-01-01

    Green Magnet® technology with close to zero electrical power consumption without the need for cooling water saves costs, space and natural resources. A compact dipole based on permanent magnets has been developed at Danfysik in collaboration with Sintex and Aarhus University. Our first Green Magnet...... coils permit fine tuning of the magnetic field. Magnetic field measurements and thermal stability tests show that the Green Magnet fully meets the magnetic requirements of the previously used electromagnet. A permanent 30° bending dipole is currently being development to demonstrate the use of Green...

  5. Variable-period permanent-magnet helical undulator

    OpenAIRE

    Jungho Mun; Young Uk Jeong; Vinokurov, Nikolay A.; Kitae Lee; Kyu-Ha Jang; Seong Hee Park; Min Yong Jeon; Sang-In Shin

    2014-01-01

    We realized a variable-period permanent-magnet helical undulator with high (∼1  T) field amplitude, which is almost constant over undulator periods of 23–26 mm. Each undulator period has four modular sections of iron poles and permanent magnets embedded in nonmagnetic disks with holes along the undulator axis. Modular plates undergo a longitudinal repulsive force from the magnetic field pressure and the spring coils between modular plates. The undulator period can thus be controlled by mechan...

  6. Magnetic forces between arrays of cylindrical permanent magnets

    DEFF Research Database (Denmark)

    Vokoun, D.; Tomassetti, G.; Beleggia, Marco

    2011-01-01

    Permanent magnet arrays are often employed in a broad range of applications: actuators, sensors, drug targeting and delivery systems, fabrication of self-assembled particles, just to name a few. An estimate of the magnetic forces in play between arrays is required to control devices and fabrication...... procedures. Here, we introduce analytical expressions for calculating the attraction force between two arrays of cylindrical permanent magnets and compare the predictions with experimental data obtained from force measurements with NdFeB magnets. We show that the difference between predicted and measured...

  7. Motor Integrated Permanent Magnet Gear in a Battery Electrical Vehicle

    DEFF Research Database (Denmark)

    Frandsen, Tommy; Mathe, Laszlo; Berg, Nick Ilsø

    2015-01-01

    This paper presents the physical construction and test results of two new demonstrators of a Motor Integrated Permanent Magnet Gear (MIPMG), which is a second version of an already tested demonstrator. The demonstrators will be used as traction units for a Battery Electrical Vehicle (BEV) and the......This paper presents the physical construction and test results of two new demonstrators of a Motor Integrated Permanent Magnet Gear (MIPMG), which is a second version of an already tested demonstrator. The demonstrators will be used as traction units for a Battery Electrical Vehicle (BEV...

  8. Safety of tattoos and permanent make-up: Final report

    OpenAIRE

    2016-01-01

    Quick guide Nowadays, tattoos are considered body art and are largely spread. They are applied by injecting coloured inks into the dermis and are meant to stay life long, thus resulting in long term exposure to the chemicals injected including their degradation products. Permanent Make-up (PMU) consists in (semi)permanent tattoos used to resemble make-up. Policy context This report addresses the issue of the safety of tattoo/PMU products and practices with a view to contribute to consumers...

  9. Modified creep and shrinkage prediction model B3 for serviceability limit state analysis of composite slabs

    National Research Council Canada - National Science Library

    Gholamhoseini, Alireza

    2016-01-01

    Relatively little research has been reported on the time-dependent in-service behavior of composite concrete slabs with profiled steel decking as permanent formwork and little guidance is available...

  10. Direct Reuse of Rare Earth Permanent Magnets—Coating Integrity

    DEFF Research Database (Denmark)

    Høgberg, Stig; Holbøll, Joachim; Mijatovic, Nenad

    2017-01-01

    Rare earth permanent magnets can be reused directly as an alternative to traditional recycling methods, in which scrapped magnets are reprocessed into new magnets by undergoing many of the original energy-intensive and expensive production processes. Direct reuse entails using segmented magnet...

  11. Structural looseness investigation in slow rotating permanent magnet generators

    DEFF Research Database (Denmark)

    Skrimpas, Georgios Alexandros; Mijatovic, Nenad; Sweeney, Christian Walsted;

    2016-01-01

    Structural looseness in electric machines is a condition influencing the alignment of the machine and thus the overall bearing health. In this work, assessment of the above mentioned failure mode is tested on a slow rotating (running speed equal to 0.7Hz) permanent magnet generator (PMG), while...

  12. SECONDARY RETENTION OF PERMANENT MOLARS - A REPORT OF 5 FAMILIES

    NARCIS (Netherlands)

    RAGHOEBAR, GM; TENKATE, LP; HAZENBERG, CAM; BOERING, G; VISSINK, A

    1992-01-01

    The aetiopathogenesis of secondary retention is not fully understood, but heredity is involved in at least some cases. In this study first-degree relatives of 52 patients with secondary retention of permanent molars were screened for the presence of the same phenomenon in their dentition. Familial o

  13. Dronedarone in high-risk permanent atrial fibrillation

    DEFF Research Database (Denmark)

    Connolly, Stuart J; Camm, A John; Halperin, Jonathan L;

    2011-01-01

    Dronedarone restores sinus rhythm and reduces hospitalization or death in intermittent atrial fibrillation. It also lowers heart rate and blood pressure and has antiadrenergic and potential ventricular antiarrhythmic effects. We hypothesized that dronedarone would reduce major vascular events...... in high-risk permanent atrial fibrillation....

  14. PERMANENCE OF A NONLINEAR DISCRETE PREDATOR-PREY SYSTEM

    Institute of Scientific and Technical Information of China (English)

    2009-01-01

    In this paper,we study a nonlinear discrete predator-prey model. We obtain a set of suffcient conditions which guarantee the permanence of the system. And an example together with its numeric simulation is presented to show the feasibility of our result.

  15. Langtidskomplikationer efter injektion af permanent vaevsfylder i laeber

    DEFF Research Database (Denmark)

    Sneistrup, Christian; Hölmich, Lisbet Rosenkrantz; Dahlstrøm, Karin

    2009-01-01

    We present two cases with signs of infection and granulomas seen years after injection of permanent fillers to the lips. These side effects are difficult to treat. They resemble an immunological foreign body response and late-onset infection as well as granuloma and scaring depending on the subst...

  16. Characterization of Failure and Permanent Deformation Behaviour of Asphalt Concrete

    NARCIS (Netherlands)

    Wang, J.G.

    2015-01-01

    Asphalt concrete is a viscoelastic material consisting of aggregates, filler and bitumen. The response of asphalt concrete is highly dependent on temperature, loading rate and confining pressure. Permanent deformation is one of the most important distresses developing during the flexible pavement

  17. Permanent magnets in accelerators can save energy, space and cost

    DEFF Research Database (Denmark)

    Bødker, F.; Baandrup, L.O.; Hauge, N.

    2013-01-01

    Green Magnet® technology with close to zero electrical power consumption without the need for cooling water saves costs, space and natural resources. A compact dipole based on permanent magnets has been developed at Danfysik in collaboration with Sintex and Aarhus University. Our first Green Magnet...... Magnet technology in other accelerator systems like synchrotron light sources and transfer beamlines....

  18. Therapeutic outcome assessment in permanent temporomandibular joint disc displacement

    NARCIS (Netherlands)

    Kropmans, TJB; Dijkstra, PU; Stegenga, B; De Bont, LGM

    1999-01-01

    In permanent temporomandibular disc displacement (TMJ-DD) outcome studies many authors claim positive effects of arthroscopic surgery, arthrocentesis and physical therapy. This literature review was undertaken to analyse whether the claimed effects are based on acceptable methodology. The recorded p

  19. 70 Years of permanent plot research in The Netherlands

    NARCIS (Netherlands)

    Smits, N.A.C.; Schaminée, J.H.J.; Duuren, van L.

    2002-01-01

    Within the framework of the Dutch `Network Ecological Monitoring¿, a large set of new permanent plots has been established to monitor selected plant communities throughout The Netherlands for studying the effects of environmental changes on species composition of semi-natural communities. This

  20. The permanent magnet propulsion motor: from infancy to adolescence

    Energy Technology Data Exchange (ETDEWEB)

    Voyce, J.E. [Royal Navy (United Kingdom); Husband, S.M. [Rolls-Royce Strategic Research Centre (United Kingdom); Mattick, D.J. [Rolls-Royce Marine (United Kingdom)

    2000-07-01

    This paper presents an update on the Permanent Magnet Propulsion Motor (PMPM) Technical Demonstrator Programme (TDP). It looks at the history behind the TDP before concentrating on the design and development of the motor. The paper highlights the manufacturing processes involved in building such a novel design, and the motor testing programme, both complete and forthcoming at the time of writing the paper. (authors)

  1. Searches for permanent electric dipole moments - Some recent developments

    NARCIS (Netherlands)

    Jungmann, KP; Bradamante, F; Bradamante, F; Bressan, A; Martin, A

    2005-01-01

    Searches for permanent electric dipole moments (EDMs) of fundamental particles provide an opportunity to discover New Physics beyond the present Standard Theory. New ideas for experiments have come up recently which may allow present limits to be lowered substantially, or even unambiguous effects to

  2. Didactic Considerations on Magnetic Circuits Excited by Permanent Magnets

    Science.gov (United States)

    Barmada, S.; Rizzo, R.; Sani, L.

    2009-01-01

    In this paper, the authors focus their attention on the way magnetic circuits and permanent magnets are usually treated in most textbooks and electrical engineering courses. This paper demonstrates how this important topic is too often presented simplistically. This simplistic treatment does not allow the students to develop a complete…

  3. Permanent Closure of the TAN-664 Underground Storage Tank

    Energy Technology Data Exchange (ETDEWEB)

    Bradley K. Griffith

    2011-12-01

    This closure package documents the site assessment and permanent closure of the TAN-664 gasoline underground storage tank in accordance with the regulatory requirements established in 40 CFR 280.71, 'Technical Standards and Corrective Action Requirements for Owners and Operators of Underground Storage Tanks: Out-of-Service UST Systems and Closure.'

  4. On the Motion of the Field of a Permanent Magnet

    Science.gov (United States)

    Leus, Vladimir; Taylor, Stephen

    2011-01-01

    A description is given of a series of recent experiments using a rotating magnetic circuit comprising a permanent magnet ring and yoke, and a stationary conductor in the air gap between the ring and yoke. The EMF induced in this case cannot be described by a simple application of Faraday's flux law. This is because the magnetic flux in the air gap…

  5. 76 FR 78698 - Proposed Revocation of Permanent Variances

    Science.gov (United States)

    2011-12-19

    ... Occupational Safety and Health Administration Proposed Revocation of Permanent Variances AGENCY: Occupational... short and plain statement detailing (1) how the proposed revocation would affect the requesting party..., subpart L. The following table provides information about the variances proposed for revocation by...

  6. Permanent magnet with MgB{sub 2} bulk superconductor

    Energy Technology Data Exchange (ETDEWEB)

    Yamamoto, Akiyasu, E-mail: yamamoto@appchem.t.u-tokyo.ac.jp [The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-8656 (Japan); JST-PRESTO, 4-1-8 Honcho, Kawaguchi, Saitama 332-0012 (Japan); Ishihara, Atsushi; Tomita, Masaru [Railway Technical Research Institute, 2-8-38 Hikari, Kokubunji, Tokyo 185-8540 (Japan); Kishio, Kohji [The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-8656 (Japan)

    2014-07-21

    Superconductors with persistent zero-resistance currents serve as permanent magnets for high-field applications requiring a strong and stable magnetic field, such as magnetic resonance imaging. The recent global helium shortage has quickened research into high-temperature superconductors (HTSs)—materials that can be used without conventional liquid-helium cooling to 4.2 K. Herein, we demonstrate that 40-K-class metallic HTS magnesium diboride (MgB{sub 2}) makes an excellent permanent bulk magnet, maintaining 3 T at 20 K for 1 week with an extremely high stability (<0.1 ppm/h). The magnetic field trapped in this magnet is uniformly distributed, as for single-crystalline neodymium-iron-boron. Magnetic hysteresis loop of the MgB{sub 2} permanent bulk magnet was determined. Because MgB{sub 2} is a simple-binary-line compound that does not contain rare-earth metals, polycrystalline bulk material can be industrially fabricated at low cost and with high yield to serve as strong magnets that are compatible with conventional compact cryocoolers, making MgB{sub 2} bulks promising for the next generation of Tesla-class permanent-magnet applications.

  7. Design Considerations of Permanent Magnet Transverse Flux Machines

    DEFF Research Database (Denmark)

    Lu, Kaiyuan; Rasmussen, Peter Omand; Ritchie, Ewen

    2011-01-01

    Permanent magnet transverse flux machine (PMTFM) is well known for its high torque density and is interested in various direct-drive applications. Due to its complicated 3-D flux components, design and design optimization of a PMTFM is more difficult and time consuming than for radial flux...

  8. Contribution to permanent magnet excited dc linear actuators

    Energy Technology Data Exchange (ETDEWEB)

    Okonkwo, R.C.; Hanitsch, R. [Technische Univ. Berlin (Germany)

    1998-07-01

    In this paper an efficient method for the computation of magnetic fields and forces in dc linear actuators built with Sm{sub 2}Co{sub 17} - permanent magnet is presented. The results obtained show good agreement with measurements. (orig.)

  9. Comparing superconducting and permanent magnets for magnetic refrigeration

    Directory of Open Access Journals (Sweden)

    R. Bjørk

    2016-05-01

    Full Text Available We compare the cost of a high temperature superconducting (SC tape-based solenoid with a permanent magnet (PM Halbach cylinder for magnetic refrigeration. Assuming a five liter active magnetic regenerator volume, the price of each type of magnet is determined as a function of aspect ratio of the regenerator and desired internal magnetic field. It is shown that to produce a 1 T internal field in the regenerator a permanent magnet of hundreds of kilograms is needed or an area of superconducting tape of tens of square meters. The cost of cooling the SC solenoid is shown to be a small fraction of the cost of the SC tape. Assuming a cost of the SC tape of 6000 $/m2 and a price of the permanent magnet of 100 $/kg, the superconducting solenoid is shown to be a factor of 0.3-3 times more expensive than the permanent magnet, for a desired field from 0.5-1.75 T and the geometrical aspect ratio of the regenerator. This factor decreases for increasing field strength, indicating that the superconducting solenoid could be suitable for high field, large cooling power applications.

  10. Design and Analysis of Tubular Permanent Magnet Linear Wave Generator

    Directory of Open Access Journals (Sweden)

    Jikai Si

    2014-01-01

    Full Text Available Due to the lack of mature design program for the tubular permanent magnet linear wave generator (TPMLWG and poor sinusoidal characteristics of the air gap flux density for the traditional surface-mounted TPMLWG, a design method and a new secondary structure of TPMLWG are proposed. An equivalent mathematical model of TPMLWG is established to adopt the transformation relationship between the linear velocity of permanent magnet rotary generator and the operating speed of TPMLWG, to determine the structure parameters of the TPMLWG. The new secondary structure of the TPMLWG contains surface-mounted permanent magnets and the interior permanent magnets, which form a series-parallel hybrid magnetic circuit, and their reasonable structure parameters are designed to get the optimum pole-arc coefficient. The electromagnetic field and temperature field of TPMLWG are analyzed using finite element method. It can be included that the sinusoidal characteristics of air gap flux density of the new secondary structure TPMLWG are improved, the cogging force as well as mechanical vibration is reduced in the process of operation, and the stable temperature rise of generator meets the design requirements when adopting the new secondary structure of the TPMLWG.

  11. Design and analysis of tubular permanent magnet linear wave generator.

    Science.gov (United States)

    Si, Jikai; Feng, Haichao; Su, Peng; Zhang, Lufeng

    2014-01-01

    Due to the lack of mature design program for the tubular permanent magnet linear wave generator (TPMLWG) and poor sinusoidal characteristics of the air gap flux density for the traditional surface-mounted TPMLWG, a design method and a new secondary structure of TPMLWG are proposed. An equivalent mathematical model of TPMLWG is established to adopt the transformation relationship between the linear velocity of permanent magnet rotary generator and the operating speed of TPMLWG, to determine the structure parameters of the TPMLWG. The new secondary structure of the TPMLWG contains surface-mounted permanent magnets and the interior permanent magnets, which form a series-parallel hybrid magnetic circuit, and their reasonable structure parameters are designed to get the optimum pole-arc coefficient. The electromagnetic field and temperature field of TPMLWG are analyzed using finite element method. It can be included that the sinusoidal characteristics of air gap flux density of the new secondary structure TPMLWG are improved, the cogging force as well as mechanical vibration is reduced in the process of operation, and the stable temperature rise of generator meets the design requirements when adopting the new secondary structure of the TPMLWG.

  12. Permanence in Nonautonomous Predator-prey Lotka-Volterra Systems

    Institute of Scientific and Technical Information of China (English)

    Wu-jun Sun; Zhi-dong Teng; Yuan-hong Yu

    2002-01-01

    In this paper some easily verifiable sufficient conditions on the permanence of solutions for general nonautonomous two-species predator-prey model are established. These new criteria improve and extend the results given by Ma, Wang[3], Teng[4] and Teng, Yu[6].

  13. PERMANENCE OF A NONLINEAR DISCRETE PREDATOR-PREY SYSTEM

    Institute of Scientific and Technical Information of China (English)

    Yaoping Chen; Fengde Chen

    2009-01-01

    In this paper,we study a nonlinear discrete predator-prey model. We obtain a set of sufficient conditions which guarantee the permanence of the system. And an example together with its numeric simulation is presented to show the feasibility of our result.

  14. Evaluation of murine models of permanent focal cerebral ischemia

    Institute of Scientific and Technical Information of China (English)

    席刚明; 汪华侨; 何国厚; 黄朝芬; 魏国耀

    2004-01-01

    Background To date murine models of permanent focal cerebral ischemia have not been well characterized. The purposes of this paper were to compare three different permanent middle cerebral artery occlusion (MCAo) models with or without craniectomy, and to identify an ideal mouse model of permanent focal cerebral ischemia.Methods Experiments were performed on 45 healthy adult male Kunming mice, weighing 28 to 42 g. The animals were randomly assigned to three groups (n=15 in every group) based on surgical procedure: MCAo via the external carotid artery (ECA), MCAo via the common carotid artery (CCA), and direct ligation of the middle cerebral artery (MCA). Each day post-ischemia, the animals were scored using an eight-grade neurological function scale, and mortality was also recorded. Seven days post-ischemia, the brains were removed for lesion size determination using triphenyltetrazolium chloride staining. Correlation analysis of lesion volume and neurological score was carried out. Results Mortality in the group receiving direct MCA ligation was lowest among the three groups, and there was a significant difference between the direct MCA ligation group and the two intraluminal occlusion groups (P0.7, P<0.05), suggesting good reproducibility of lesion volume in the three groups, but the infarct volume was more constant in the direct MCA ligation group. Conclusion The direct ligation model of MCAo provides an optimal means of studying permanent focal cerebral ischemia, and is preferable to the models using intraluminal sutures.

  15. Children without Permanent Parents: Research, Practice, and Policy

    Science.gov (United States)

    Bakermans-Kranenburg, Marian J.; Bos, Karen; Bunkers, Kelley McCreery; Dobrova-Krol, Natasha A.; Engle, Patrice L.; Fox, Nathan A.; Gamer, Gary N.; Goldman, Philip; Groark, Christina J.; Greenberg, Aaron; Grotevant, Harold D.; Groza, Victor K.; Gunnar, Megan R.; Johnson, Dana E.; Juffer, Femmie; Kreppner, Jana M.; Le Mare, Lucy; McCall, Robert B.; Muhamedrahimov, Rifkat J.; Nelson, Charles A., III; Palacios, Jesus; Sonuga-Barke, Edmund J. S.; Steele, Howard; Steele, Miriam; Tieman, Wendy; van IJzendoorn, Marinus H.; Verhulst, Frank C.; Vorria, Panayiota; Zeanah, Charles H.

    2011-01-01

    This monograph reviews literature pertaining to children without permanent parents. Chapters review (1) the development of children while institutional residents; (2) the development of postinstitutionalized children transitioned to family environments (i.e., adoption); the effects of institutionalization on (3) attachment behaviors, (4) physical…

  16. Compact ECR ion source with permanent magnets for Carbon therapy

    NARCIS (Netherlands)

    Muramatsu, M; Kitagawa, A; Sakamoto, Y; Sato, Y; Yamada, S; Ogawa, H; Drentje, AG; Biri, S; Yoshida, Y

    Ion sources for the medical facilities should have the following characteristics of easy maintenance, low electric power, good stability, and long operation time without trouble (1 year or longer). For this, a 10 GHz compact electron cyclotron resonance ion source (ECRIS) with all permanent magnets

  17. 12 CFR 615.5240 - Permanent capital requirements.

    Science.gov (United States)

    2010-01-01

    ... capital requirements. (a) The capitalization bylaws shall enable the institution to meet the capital adequacy standards established under subparts H and K of this part and the total capital requirements... 12 Banks and Banking 6 2010-01-01 2010-01-01 false Permanent capital requirements....

  18. Fully permanent magnet atom chip for Bose-Einstein condensation

    NARCIS (Netherlands)

    T. Fernholz; R. Gerritsma; S. Whitlock; I. Barb; R.J.C. Spreeuw

    2008-01-01

    We describe a proof-of-principle experiment on a fully permanent magnet atom chip. We study ultracold atoms and produce a Bose-Einstein condensate. The magnetic trap is loaded efficiently by adiabatic transport of a magnetic trap via the application of uniform external fields. Radio frequency spectr

  19. Exponential Time Complexity of the Permanent and the Tutte Polynomial

    DEFF Research Database (Denmark)

    Dell, Holger; Husfeldt, Thore; Marx, Dániel

    2014-01-01

    We show conditional lower bounds for well-studied #P-hard problems: The number of satisfying assignments of a 2-CNF formula with n variables cannot be computed in time exp(o(n)), and the same is true for computing the number of all independent sets in an n-vertex graph. The permanent of an n× n...

  20. Permanent Electric Dipole Moment Search in 129Xe

    NARCIS (Netherlands)

    Grasdijk, Jan; Bluemler, P.; Almendinger, F.; Heil, Werner; Jungmann, Klaus-Peter; Karpuk, S.; Krause, Hans-Joachim; Offenhaeuser, Andreas; Repetto, M.; Schmidt, Ulrich; Sobolev, Y.; Willmann, Lorenz; Zimmer, Stefan

    2017-01-01

    A permanent electric dipole moment (EDM) implies breakdown of P (parity) and T (time reversal) symmetries. Provided CPT holds, this implies CP violation. Observation of an EDM at achievable experimental sensitivity would provide unambiguous evidence for physics beyond the Standard Model and limits

  1. Searches for permanent electric dipole moments - Some recent developments

    NARCIS (Netherlands)

    Jungmann, KP; Bradamante, F; Bradamante, F; Bressan, A; Martin, A

    2005-01-01

    Searches for permanent electric dipole moments (EDMs) of fundamental particles provide an opportunity to discover New Physics beyond the present Standard Theory. New ideas for experiments have come up recently which may allow present limits to be lowered substantially, or even unambiguous effects to

  2. To return permanently or to return temporarily?: Explaining migrants' intentions

    NARCIS (Netherlands)

    Bilgili, Ö.; Siegel, M.

    2014-01-01

    This paper studies migrants' intentions to return to their origin country by making the distinction between permanent return, temporary return and participation in temporary return programmes. Using survey data from first generation migrants in the Netherlands, we explore how migrants' experiences r

  3. Ultradiscrete soliton equations derived from ultradiscrete permanent formulae

    Energy Technology Data Exchange (ETDEWEB)

    Nakamura, Shinya, E-mail: s-nakamura@moegi.waseda.jp [Major in Pure and Applied Mathematics, Graduate School of Fundamental Science and Engineering, Waseda University, 3-4-1, Okubo, Shinjuku-ku, Tokyo 169-8555 (Japan)

    2011-07-22

    We propose formulae of ultradiscrete permanent. Utilizing the formulae, ultradiscrete soliton equations and their multi-soliton solutions are obtained by a simple process. Changing variables and parameters of the formulae, we can derive the ultradiscrete Toda, KdV and hungry Lotka-Volterra equations. An extended version of the ultradiscrete hungry Lotka-Volterra equation is also proposed.

  4. Modeling of Exterior Rotor Permanent Magnet Machines with Concentrated Windings

    NARCIS (Netherlands)

    Vu Xuan, H.

    2012-01-01

    In this thesis modeling, analysis, design and measurement of exterior rotor permanent magnet (PM) machines with concentrated windings are dealt with. Special attention is paid to slotting effect. The PM machine is integrated in flywheel and used for small-scale ship application. Analytical model and

  5. Characterization of Failure and Permanent Deformation Behaviour of Asphalt Concrete

    NARCIS (Netherlands)

    Wang, J.G.

    2015-01-01

    Asphalt concrete is a viscoelastic material consisting of aggregates, filler and bitumen. The response of asphalt concrete is highly dependent on temperature, loading rate and confining pressure. Permanent deformation is one of the most important distresses developing during the flexible pavement se

  6. Permanent GPS Station Sulp: Problems and Preliminary Results

    Science.gov (United States)

    Abrikosov, O.; Zablotskyj, F.; Savchuk, S.

    The permanent GPS station SULP is operating starting from September 2001. GPS observations are carrying out by means of the receiver Trimble 4700 and the antenna Zephyr mounted at the fundamental monument of the Astronomical Observatory of the National University "Lviv Polytechnic". Starting from October 2001, daily and hourly observation files are hosted by OLG Data Center. Analysis of these data is performing by WUT and GOP Analysis Centers. Station SULP was included into episodic GPS campaigns GEODUC (1995) and CEGRN (1994 - 1999, 2001). There- fore, besides the traditional task of providing the permanent high-precision GPS ob- servations for supporting the European networks EUREF and CEGRN, it is planned to use SULP station for the following problems. (1) Investigation of recent movements of the Earth's surface in Carpathian area, particularly in the frames of CERGOP project. (2) Studying of local peculiarities of the atmosphere and constructing of correspond- ing mathematical models. (3) Providing of coordinate data for geodetic activities in the Western Ukraine. GPS data analysis for the mentioned problems is performing by means of GAMIT software. The permanent stations, which surround the Carpathian mountain area, are included into the analysis together with 4 active Ukrainian perma- nent GPS stations. First results show the possibility of the geodetic monitoring based on the permanent station SULP.

  7. Overview: Permanent University Fund (PUF)/Higher Education Fund (HEF)

    Science.gov (United States)

    Texas Higher Education Coordinating Board, 2009

    2009-01-01

    All public institutions of higher education except community colleges and the Texas A&M University System College of Dentistry receive funding for construction and other capital purposes from the Permanent University Fund (PUF) or the Higher Education Fund (HEF) (sometimes referred to as the Higher Education Assistance Fund or HEAF). The…

  8. Searches for permanent electric dipole moments in Radium isotopes

    NARCIS (Netherlands)

    Willmann, L.; Jungmann, K.; Wilschut, H.W.

    2010-01-01

    Permanent electric dipole moments are uniquely sensitive to sources of T and P violation in fundamental interactions. In particular radium isotopes offer the largest intrinsic sensitivity. We want to explore the prospects for utilizing the high intense beams from HIE-ISOLDE to boost the statistical

  9. Development of a semi-permanent mascara technology.

    Science.gov (United States)

    Dempsey, J H; Fabula, A M; Rabe, T E; Lubbers, J M; Ye, M

    2012-02-01

    Many women would like their mascara beauty benefits to be available all day, every day. One way to address this desire is through a semi-permanent mascara technology that provides full mascara benefits of long, dark beautiful lashes for multiple days. To date, products promising multi-day benefits have acted more as either 'lash dyes', providing a lash darkening benefit but failing to provide fullness and length, or waterproof mascaras that do not maintain the initial beauty look over multiple days. Here, a formulation approach is described for a mascara product that is designed to be abrasion resistant, flexible and insoluble in soap and water so that the initial beauty look is maintained for multiple days. The new semi-permanent formula technology uses rosinate polymers that have a superior combination of flexibility, abrasion resistance and water and surfactant resistance. Based on principles used by the paint industry for creating durable films, the levels of the polymers and other non-volatile ingredients are balanced such that the product forms a continuous polymer film on the eyelash. Cryo-SEM is used to demonstrate that the new semi-permanent formula technology forms a film different from those formed by current mascara products. A stretch test and rub test are used to demonstrate that the new semi-permanent formula technology has superior flexibility and abrasion resistance to current mascara products. Finally, a multi-day consumer study with daily imaging of the eyes is used to demonstrate the superior wear performance of the new semi-permanent formula technology in actual usage.

  10. Sensorless operation of surface mount permanent magnet AC (PMAC) motors

    Energy Technology Data Exchange (ETDEWEB)

    Toliyat, H.A.; Rahman, K.M.; Shet, D.S.

    1999-12-01

    A sensorless field oriented control scheme for surface mount permanent magnet ac (PMAC) motor with split phase stator windings is presented. This motor is obtained by splitting the phase windings of a conventional three phase motor. The six-phase motor, however is run as a three-phase motor by connecting the split phase stator windings in series, while the taps are made available for voltage measurements. By measuring the terminal voltages and the line currents, absolute position of the permanent magnet ac motor driven by a current regulated PWM inverter with a hysteresis controller is estimated. The estimated position information is independent of the stator resistance, thus this scheme is even applicable at low speeds. Results are presented to show the effectiveness of the new controller, and it is also shown that the position error is negligible.

  11. Crustal deformations at permanent GPS sites in Denmark

    DEFF Research Database (Denmark)

    Khan, Shfaqat Abbas; Knudsen, Per; Tscherning, Carl Christian

    2005-01-01

    The National Survey and Cadastre (KMS) is responsible for the geodetic definition of the reference network in Denmark. Permanent GPS stations play an important role in the monitoring and maintenance of the geodetic network. During 1998 and 1999 KMS established three permanent GPS station in Denmark......, SMID, SULD and BUDP. Using almost 4.5 years of continuous data from the Danish station and the Swedish station, ONSA, we analyse the daily GPS solution due to crustal deformation caused by glacial isostatic adjustment (GIA). Although, displacements due to GIA are only 1–3 mm/year at the Danish GPS...... sites, the current precision of positioning using GPS allows us to observe these effects. The modelled horizontal GIA velocities and the observed horizontal residuals obtained from GPS show almost the same direction for all station. However, the observed velocity residuals are larger than the modelled...

  12. Modeling of Hybrid Permanent Magnetic-Gas Bearings

    DEFF Research Database (Denmark)

    Morosi, Stefano; Santos, Ilmar

    2009-01-01

    Modern turbomachinery applications require nowadays ever-growing rotational speeds and high degree of reliability. It then becomes natural to focus the attention of the research to contact-free bearings elements. The present alternatives focus on gas lubricated journal bearings or magnetic bearings....... In the present paper both the technologies are combined with the aim of developing a new kind of hybrid permanent magnetic - gas bearing. This new kind of machine is intended to exploit the benefits of the two technologies while minimizing their drawbacks. The poor start-up and low speed operation performance...... of the gas bearing is balanced by the properties of the passive magnetic one. At high speeds the dynamic characteristics of the gas bearing are improved by offsetting the stator ring of the permanent magnetic bearing. Furthermore this design shows a kind of redundancy, which offers soft failure properties...

  13. Hanford Permanent Isolation Barrier Program: Asphalt technology test plan

    Energy Technology Data Exchange (ETDEWEB)

    Freeman, H.D.; Romine, R.A.

    1994-05-01

    The Hanford Permanent Isolation Barriers use engineered layers of natural materials to create an integrated structure with backup protective features. The objective of current designs is to develop a maintenance-free permanent barrier that isolates wastes for a minimum of 1000 years by limiting water drainage to near-zero amounts. Asphalt is being used as an impermeable water diversion layer to provide a redundant layer within the overall barrier design. Data on asphalt barrier properties in a buried environment are not available for the required 100-year time frame. The purpose of this test plan is to outline the activities planned to obtain data with which to estimate performance of the asphalt layers.

  14. System Cost Analysis for an Interior Permanent Magnet Motor

    Energy Technology Data Exchange (ETDEWEB)

    Peter Campbell

    2008-08-01

    The objective of this program is to provide an assessment of the cost structure for an interior permanent magnet ('IPM') motor which is designed to meet the 2010 FreedomCAR specification. The program is to evaluate the range of viable permanent magnet materials for an IPM motor, including sintered and bonded grades of rare earth magnets. The study considers the benefits of key processing steps, alternative magnet shapes and their assembly methods into the rotor (including magnetization), and any mechanical stress or temperature limits. The motor's costs are estimated for an annual production quantity of 200,000 units, and are broken out into such major components as magnetic raw materials, processing and manufacturing. But this is essentially a feasibility study of the motor's electromagnetic design, and is not intended to include mechanical or thermal studies as would be done to work up a selected design for production.

  15. A Practical Permanent Magnetic Motor Drive for Hybrid Motorcycle

    Institute of Scientific and Technical Information of China (English)

    崔巍; 江建中; 邵定国; 杨斌

    2003-01-01

    A novel embedded-type permanent magnetic motor for hybrid motorcycle, which employs asymmetric design of eccentric air-gap, is proposed in the paper. This special design of air-gap well conforms to the mono-directional operation characteristic of motorcycle and effectively suppresses the distortion of air-gap magnetic field caused by armature reaction. Hence the torque ripple is reduced. A drive system consisting of the newly-designed Nd-Fe-B permanent magnet synchronous motor and parallel-MOSFET threephase inverter for hybrid motorcycle propulsion is established. Wide-range speed operation is realized through a simple and novel control strategy. Computer simulation is described and experimental results given to verify the practicality of the proposed motor design and control strategy.

  16. INEGI's Network of GPS permanent stations in Mexico

    Science.gov (United States)

    Gonzalez Franco, G. A.

    2013-05-01

    The Active National Geodetic Network administered by INEGI (Instituto Nacional de Estadística y Geografía) is a set of 24 GPS permanent stations in Mexico that was established in 1993 for a national rural cadastral project, its has been mainly used for geodetic surveys through Mexico including international borders, and has been progressing to contribute to national, regional and international reference frames through the delivering of GPS data or coordinate solutions from INEGI Processing Center to SIRGAS and NAREF. Recently GAMIT/GLOBK Processing of permanent stations in Mexico was realized from 2007-2011 to determine station's velocity. Related to natural hazards, a subset of INEGI network contributes to the project Real Time Integrated Atmosferic Water Wapor and TEC from GPS. The GPS network planned evolution consider changing to a GNSS network, adding stations to IGS, maintain the services of the present, and contribute to multidisciplinary geodetic studies through data publicly available.

  17. The permanently shadowed regions of dwarf planet Ceres

    Science.gov (United States)

    Schorghofer, Norbert; Mazarico, Erwan; Platz, Thomas; Preusker, Frank; Schröder, Stefan E.; Raymond, Carol A.; Russell, Christopher T.

    2016-07-01

    Ceres has only a small spin axis tilt (4°), and craters near its rotational poles can experience permanent shadow and trap volatiles, as is the case on Mercury and on Earth's Moon. Topography derived from stereo imaging by the Dawn spacecraft is used to calculate direct solar irradiance that defines the extent of the permanently shadowed regions (PSRs). In the northern polar region, PSRs cover ˜1800 km2 or 0.13% of the hemisphere, and most of the PSRs are cold enough to trap water ice over geological time periods. Based on modeling of the water exosphere, water molecules seasonally reside around the winter pole and ultimately an estimated 0.14% of molecules get trapped. Even for the lowest estimates of the amount of available water, this predicts accumulation rates in excess of loss rates, and hence, there should be fresh ice deposits in the cold traps.

  18. Optimal Design Solutions for Permanent Magnet Synchronous Machines

    Directory of Open Access Journals (Sweden)

    POPESCU, M.

    2011-11-01

    Full Text Available This paper presents optimal design solutions for reducing the cogging torque of permanent magnets synchronous machines. A first solution proposed in the paper consists in using closed stator slots that determines a nearly isotropic magnetic structure of the stator core, reducing the mutual attraction between permanent magnets and the slotted armature. To avoid complications in the windings manufacture technology the stator slots are closed using wedges made of soft magnetic composite materials. The second solution consists in properly choosing the combination of pole number and stator slots number that typically leads to a winding with fractional number of slots/pole/phase. The proposed measures for cogging torque reduction are analyzed by means of 2D/3D finite element models developed using the professional Flux software package. Numerical results are discussed and compared with experimental ones obtained by testing a PMSM prototype.

  19. Iron free permanent magnet systems for charged particle beam optics

    Energy Technology Data Exchange (ETDEWEB)

    Lund, S.M.; Halbach, K.

    1995-09-03

    The strength and astounding simplicity of certain permanent magnet materials allow a wide variety of simple, compact configurations of high field strength and quality multipole magnets. Here we analyze the important class of iron-free permanent magnet systems for charged particle beam optics. The theory of conventional segmented multipole magnets formed from uniformly magnetized block magnets placed in regular arrays about a circular magnet aperture is reviewed. Practical multipole configurations resulting are presented that are capable of high and intermediate aperture field strengths. A new class of elliptical aperture magnets is presented within a model with continuously varying magnetization angle. Segmented versions of these magnets promise practical high field dipole and quadrupole magnets with an increased range of applicability.

  20. FUZZY FAULT DETECTION FOR PERMANENT MAGNET SYNCHRONOUS GENERATOR

    Directory of Open Access Journals (Sweden)

    N. Selvaganesan

    2011-07-01

    Full Text Available Faults in engineering systems are difficult to avoid and may result in serious consequences. Effective fault detection and diagnosis can improve system reliability and avoid expensive maintenance. In this paper fuzzy system based fault detection scheme for permanent magnet synchronous generator is proposed. The sequence current components like positive and negative sequence currents are used as fault indicators and given as inputs to fuzzy fault detector. Also, the fuzzy inference system is created and rule base is evaluated, relating the sequence current component to the type of faults. These rules are fired for specific changes in sequence current component and the faults are detected. The feasibility of the proposed scheme for permanent magnet synchronous generator is demonstrated for different types of fault under various operating conditions using MATLAB/Simulink.

  1. Development of HMPE fiber for deep water permanent mooring applications

    Energy Technology Data Exchange (ETDEWEB)

    Vlasblom, Martin; Fronzaglia, Bill; Boesten, Jorn [DSM Dyneema, Urmond (Netherlands); Leite, Sergio [Lankhorst Ropes, Sneek (Netherlands); Davies, Peter [Institut Francais de Recherche pour L' Exploration de la Mer (IFREMER) (France)

    2012-07-01

    For a number of years, the creep performance of standard High Modulus Polyethylene (HMPE) fiber types has limited their use in synthetic offshore mooring systems. In 2003, a low creep HMPE fiber was introduced and qualified for semi-permanent MODU moorings. This paper reports on a new High Modulus Polyethylene fiber type with significantly improved creep properties compared to any other HMPE fiber type, which, for the first time, allows its use in permanent offshore mooring systems, for example for deep water FPSO moorings. Results on fiber and rope creep experiments and stiffness measurements are reported. Laboratory testing shows that ropes made with the new fiber type retain the properties characteristic of HMPE such as high static strength, high fatigue resistance and stiffness, and illustrate that stiffness properties determined on HMPE fiber or rope are dependent on the applied load and temperature. (author)

  2. Mold Materials For Permanent Molding of Aluminum Alloys

    Energy Technology Data Exchange (ETDEWEB)

    John F Wallace; David Schwam; Wen Hong dxs11@po.cwru.edu

    2001-09-14

    A test that involves immersion of the potential mod materials for permanent molds has been developed that provides a thermal cycle that is similar to the experienced during casting of aluminum in permanent molds. This test has been employed to determine the relative thermal fatigue resistance of several different types of mold materials. Four commercial mold coatings have been evaluated for their insulating ability, wear resistance and roughness. The results indicate that composition and structure of the mold materials have considerable effect on their thermal fatigue cracking behavior. Irons with a gray iron structure are the most prone to thermal fatigue cracking followed by compacted graphite irons with the least thermal fatigue cracking of the cast irons experienced by ductile iron. The composition of these various irons affects their behavior.

  3. Grain Refinement of Permanent Mold Cast Copper Base Alloys

    Energy Technology Data Exchange (ETDEWEB)

    M.Sadayappan; J.P.Thomson; M.Elboujdaini; G.Ping Gu; M. Sahoo

    2005-04-01

    Grain refinement is a well established process for many cast and wrought alloys. The mechanical properties of various alloys could be enhanced by reducing the grain size. Refinement is also known to improve casting characteristics such as fluidity and hot tearing. Grain refinement of copper-base alloys is not widely used, especially in sand casting process. However, in permanent mold casting of copper alloys it is now common to use grain refinement to counteract the problem of severe hot tearing which also improves the pressure tightness of plumbing components. The mechanism of grain refinement in copper-base alloys is not well understood. The issues to be studied include the effect of minor alloy additions on the microstructure, their interaction with the grain refiner, effect of cooling rate, and loss of grain refinement (fading). In this investigation, efforts were made to explore and understand grain refinement of copper alloys, especially in permanent mold casting conditions.

  4. Rational design of the exchange-spring permanent magnet.

    Science.gov (United States)

    Jiang, J S; Bader, S D

    2014-02-12

    The development of the optimal exchange-spring permanent magnet balances exchange hardening, magnetization enhancement, and the feasibility of scalable fabrication. These requirements can be met with a rational design of the microstructural characteristics. The magnetization processes in several model exchange-spring structures with different geometries have been analyzed with both micromagnetic simulations and nucleation theory. The multilayer geometry and the soft-cylinders-in-hard-matrix geometry have the highest achievable figure of merit (BH)max, while the soft-spheres-in-hard-matrix geometry has the lowest upper limit for (BH)max. The cylindrical geometry permits the soft phase to be larger and does not require strict size control. Exchange-spring permanent magnets based on the cylindrical geometry may be amenable to scaled-up fabrication.

  5. Sealants for preventing dental decay in the permanent teeth

    DEFF Research Database (Denmark)

    Ahovuo-Saloranta, Anneli; Forss, Helena; Walsh, Tanya;

    2013-01-01

    or the baseline caries prevalence.- Resin-based sealant compared with no sealant: Compared to control without sealant, second or third or fourth generation resin-based sealants prevented caries in first permanent molars in children aged 5 to 10 years (at 2 years of follow-up odds ratio (OR) 0.12, 95% confidence...... 2012). SELECTION CRITERIA: Randomised or quasi-randomised controlled trials of at least 12 months duration comparing sealants for preventing caries of occlusal or approximal surfaces of premolar or molar teeth with no sealant or different type of sealant in children and adolescents under 20 years...... of age. DATA COLLECTION AND ANALYSIS: Two review authors independently screened search results, extracted data and assessed trial quality. We calculated the odds ratio (OR) for caries or no caries on occlusal surfaces of permanent molar teeth. For trials with a split-mouth design, the Becker...

  6. A New Torque Control System of Permanent Magnet Synchronous Motor

    Directory of Open Access Journals (Sweden)

    Evstratov Andrey

    2017-01-01

    Full Text Available The article describes a new approach to control of permanent magnet synchronous motor drive based on the analysis of the electromechanical transformation. The proposed control system provides quick response and low ripple of the motor torque and flux. To synthesis this control system, the authors put the electromagnetic torque and the modulus of stator flux vector as controlled values and use the Lyapunov’s second method. In addition, the stator voltage constriction and ability of low-pass filtration are taken into account. The investigation of the proposed control system has carried out with the simulation and the experimental research which have confirmed that the proposed control system correspond to all above-mentioned control tasks and the permanent magnet synchronous motor controlled under this system may be recommended to use in robotics.

  7. The permanent and induced magnetic dipole moment of the moon

    Science.gov (United States)

    Russell, C. T.; Coleman, P. J., Jr.; Lichtenstein, B. R.; Schubert, G.

    1974-01-01

    Magnetic field observations with the Apollo 15 subsatellite have been used to deduce the components of both the permanent and induced lunar dipole moments in the orbital plane. The present permanent lunar magnetic dipole moment in the orbital plane is less than 1.3 times ten to the eighteenth power gauss-cu cm. Any uniformly magnetized near surface layer is therefore constrained to have a thickness-magnetization product less than 2.5 emu-cm per g. The induced moment opposes the external field, implying the existence of a substantial lunar ionosphere with a permeability between 0.63 and 0.85. Combining this with recent measures of the ratio of the relative field strength at the ALSEP and Explorer 35 magnetometers indicates that the global lunar permeability relative to the plasma in the geomagnetic tail lobes is between 1.008 and 1.03.

  8. Sampling Hyperpolarized Molecules Utilizing a 1 Tesla Permanent Magnetic Field.

    Science.gov (United States)

    Tee, Sui Seng; DiGialleonardo, Valentina; Eskandari, Roozbeh; Jeong, Sangmoo; Granlund, Kristin L; Miloushev, Vesselin; Poot, Alex J; Truong, Steven; Alvarez, Julio A; Aldeborgh, Hannah N; Keshari, Kayvan R

    2016-09-06

    Hyperpolarized magnetic resonance spectroscopy (HP MRS) using dynamic nuclear polarization (DNP) is a technique that has greatly enhanced the sensitivity of detecting (13)C nuclei. However, the HP MRS polarization decays in the liquid state according to the spin-lattice relaxation time (T1) of the nucleus. Sampling of the signal also destroys polarization, resulting in a limited temporal ability to observe biologically interesting reactions. In this study, we demonstrate that sampling hyperpolarized signals using a permanent magnet at 1 Tesla (1T) is a simple and cost-effective method to increase T1s without sacrificing signal-to-noise. Biologically-relevant information may be obtained with a permanent magnet using enzyme solutions and in whole cells. Of significance, our findings indicate that changes in pyruvate metabolism can also be quantified in a xenograft model at this field strength.

  9. Design of magnet arrays for permanent magnetic linear motor

    Institute of Scientific and Technical Information of China (English)

    Junhong MAO; Junhang LUO; Qiang JIANG; Youbai XIE

    2008-01-01

    An iron-less single side permanent magnetic linear motor structure is presented,and two-dimensional analytical formulae for its magnetic field are deduced to design the types of magnetic arrays,the thickness of permanent magnet,and the duty ratio of magnet arrays,etc.With certain design parameters,conventional arrays are used instead of a piecewise Halbach arrays,and the machining and assembling of the motor are greatly simplified.Calculation results coincide with that of ANSYS.The analytical formulae can be used in designing cored linear motors by modifying boundary conditions.A linear motor driven bench with a single degree of freedom is realized,where the travel reaches 27 mm,the mass of the moving parts is 1.4 kg,and the maximum acceleration iS 11.5 m/s2.

  10. Study on cogging force of permanent magnet linear synchronous motor

    Institute of Scientific and Technical Information of China (English)

    SHANGGUAN Xuan-feng; YUAN Shi-ying; LI Qing-fu

    2005-01-01

    Presented the methods to obtain the cogging force of permanent magnet linear synchronous motors(PMLSMs), analyzed the characteristics of the cogging force,and provided a basis for reducing the effect of the cogging force. 2-dimensional finite element method(2D FEM) was used to solve the whole motor when its mover was at different position, so that the relation was derived between the cogging force and the mover position. The analysis results show that the cogging force between the two ends of the primary iron-core and the secondary permanent magnets (PMs) is sinusoidal function of the mover position under certain conditions only. Two proposed methods,namely direct and indirect methods, are applied to calculate the cogging force between the primary iron-core teeth and the secondary PMs. The agreement of the two methods is validated.

  11. A fine-cut technique for permanent laryngeal sectioning.

    Science.gov (United States)

    Roy, S; Lundy, D S; Marcillo, A S; Casiano, R R

    2001-01-01

    A new technique for permanent sectioning of the human spinal cord has provided superior images over those produced with traditional methods. Application of this technique for sections of the human larynx may yield cost-effective, efficient, and accurate laryngeal anatomic dissections. This study was designed to evaluate this technique for dissections of the human larynx. Laryngeal sections from cadavers were submerged in a celloidin solution, a derivative of wallpaper plaster, and frozen to -15 degrees C. After preparation, axial and coronal cuts of 100 microm were made with a Macrocut Tome sectioning system. Sections were completed in approximately 30 hours. Digitized photographs of the laryngeal sections provide detailed images of precise anatomic relationships. Celloidin-based sectioning of the human larynx yields precise anatomic information beyond standard radiographic imagining and previous permanent laryngeal sectioning techniques in a cost-efficient and timely manner. Black and white fine-section photographs are provided.

  12. Crustal deformations at permanent GPS sites in Denmark

    DEFF Research Database (Denmark)

    Khan, Shfaqat Abbas; Knudsen, Per; Tscherning, Carl Christian

    2005-01-01

    The National Survey and Cadastre (KMS) is responsible for the geodetic definition of the reference network in Denmark. Permanent GPS stations play an important role in the monitoring and maintenance of the geodetic network. During 1998 and 1999 KMS established three permanent GPS station in Denmark......, SMID, SULD and BUDP. Using almost 4.5 years of continuous data from the Danish station and the Swedish station, ONSA, we analyse the daily GPS solution due to crustal deformation caused by glacial isostatic adjustment (GIA). Although, displacements due to GIA are only 1–3 mm/year at the Danish GPS...... sites, the current precision of positioning using GPS allows us to observe these effects. The modelled horizontal GIA velocities and the observed horizontal residuals obtained from GPS show almost the same direction for all station. However, the observed velocity residuals are larger than the modelled...

  13. Femoral approach: an exceptional alternative for permanent pacemaker implantation.

    Science.gov (United States)

    Tereno Valente, Bruno; Conceição, José M; Nogueira da Silva, Manuel; M Oliveira, Mário; S Cunha, Pedro; Lousinha, Ana; Galrinho, Ana; C Ferreira, Rui

    2014-05-01

    The classic transvenous implantation of a permanent pacemaker in a pectoral location may be precluded by obstruction of venous access through the superior vena cava or recent infection at the implant site. When these barriers to the procedure are bilateral and there are also contraindications or technical difficulties to performing a thoracotomy for an epicardial approach, the femoral vein, although rarely used, can be a viable alternative. We describe the case of a patient with occlusion of both subclavian veins and a high risk for mini-thoracotomy or videothoracoscopy, who underwent implantation of a permanent single-chamber pacemaker via the right femoral vein. Copyright © 2013 Sociedade Portuguesa de Cardiologia. Published by Elsevier España. All rights reserved.

  14. Sampling Hyperpolarized Molecules Utilizing a 1 Tesla Permanent Magnetic Field

    Science.gov (United States)

    Tee, Sui Seng; Digialleonardo, Valentina; Eskandari, Roozbeh; Jeong, Sangmoo; Granlund, Kristin L.; Miloushev, Vesselin; Poot, Alex J.; Truong, Steven; Alvarez, Julio A.; Aldeborgh, Hannah N.; Keshari, Kayvan R.

    2016-09-01

    Hyperpolarized magnetic resonance spectroscopy (HP MRS) using dynamic nuclear polarization (DNP) is a technique that has greatly enhanced the sensitivity of detecting 13C nuclei. However, the HP MRS polarization decays in the liquid state according to the spin-lattice relaxation time (T1) of the nucleus. Sampling of the signal also destroys polarization, resulting in a limited temporal ability to observe biologically interesting reactions. In this study, we demonstrate that sampling hyperpolarized signals using a permanent magnet at 1 Tesla (1T) is a simple and cost-effective method to increase T1s without sacrificing signal-to-noise. Biologically-relevant information may be obtained with a permanent magnet using enzyme solutions and in whole cells. Of significance, our findings indicate that changes in pyruvate metabolism can also be quantified in a xenograft model at this field strength.

  15. New Cogging Torque Reduction Methods for Permanent Magnet Machine

    Science.gov (United States)

    Bahrim, F. S.; Sulaiman, E.; Kumar, R.; Jusoh, L. I.

    2017-08-01

    Permanent magnet type motors (PMs) especially permanent magnet synchronous motor (PMSM) are expanding its limbs in industrial application system and widely used in various applications. The key features of this machine include high power and torque density, extending speed range, high efficiency, better dynamic performance and good flux-weakening capability. Nevertheless, high in cogging torque, which may cause noise and vibration, is one of the threat of the machine performance. Therefore, with the aid of 3-D finite element analysis (FEA) and simulation using JMAG Designer, this paper proposed new method for cogging torque reduction. Based on the simulation, methods of combining the skewing with radial pole pairing method and skewing with axial pole pairing method reduces the cogging torque effect up to 71.86% and 65.69% simultaneously.

  16. Bearingless Permanent Magnet Synchronous Motor using Independent Control

    Directory of Open Access Journals (Sweden)

    Normaisharah Mamat

    2015-06-01

    Full Text Available Bearingless permanent magnet synchronous motor (BPMSM combines the characteristic of the conventional permanent magent synchronous motor and magnetic bearing in one electric motor. BPMSM is a kind of high performance motor due to having both advantages of PMSM and magnetic bearing with simple structure, high efficiency, and reasonable cost. The research on BPMSM is to design and analyse BPMSM by using Maxwell 2-Dimensional of ANSYS Finite Element Method (FEM. Independent suspension force model and bearingless PMSM model are developed by using the method of suspension force. Then, the mathematical model of electromagnetic torque and radial suspension force has been developed by using Matlab/Simulink. The relation between force, current, distance and other parameter are determined. This research covered the principle of suspension force, the mathematical model, FEM analysis and digital control system of bearingless PMSM. This kind of motor is widely used in high speed application such as compressors, pumps and turbines.

  17. Photovoltaic-wind hybrid system for permanent magnet DC motor

    Science.gov (United States)

    Nasir, M. N. M.; Lada, M. Y.; Baharom, M. F.; Jaafar, H. I.; Ramani, A. N.; Sulaima, M. F.

    2015-05-01

    Hybrid system of Photovoltaic (PV) - Wind turbine (WT) generation has more advantages and reliable compared to PV or wind turbine system alone. The aim of this paper is to model and design hybrid system of PV-WT supplying 100W permanent-magnet dc motor. To achieve the objective, both of PV and WT are connected to converter in order to get the same source of DC supply. Then both sources were combined and straightly connected to 100W permanent magnet dc motor. All the works in this paper is only applied in circuit simulator by using Matlab Simulink. The output produced from each converter is expected to be suit to the motor specification. The output produced from each renewable energy system is as expected to be high as it can support the motor if one of them is breakdown

  18. Cogging torque reduction for interior permanent magnet synchronous motors

    OpenAIRE

    Tost Candel, Miquel

    2015-01-01

    Interior permanent magnet synchronous machines show a good range of behaviours, which make these kinds of machines good candidates for an electromechanical energy conversion. However, in order to improve their accuracy in their torque responses, the cogging torque and torque ripple phenomena should be mitigated to obtain better performance of the machine. In order to reduce the cogging torque and torque ripple, control techniques as well as geometric parameters of the machine have to be im...

  19. Do bacteria have an electric permanent dipole moment?

    Science.gov (United States)

    Stoylov, S P; Gyurova, A; Georgieva, R; Danova, S

    2008-07-15

    In the scientific literature in the last 40 years, some data for the permanent dipole moment and the electric polarizability of Escherichia coli can be found [S.P. Stoylov, Colloid Electro-Optics - Theory, Techniques and Application, Academic Press, London, 1991]. In this paper the data based mainly on electro-optic investigation is considered as much as some dipolophoretic (most often called dielectrophoretic) studies. Serious grounds are found to doubt the conclusions made for the electric dipole moments of bacteria by one of the authors of this paper (SPS) and by some other researchers. This concerns both the permanent dipole moment and the electric charge dependent polarizabilities of E. coli. Here, along with the discussion of the old experimental data, new experimental data are shown for a strain of E. coli HB101. The conclusions from the analysis of the old and the new experimental data is that they do not provide correct evidence for the presence of a permanent dipole moment. It seems that all statements for the existence of electric permanent dipole moment in bacteria [S.P. Stoylov, Colloid Electro-Optics - Theory, Techniques and Application, Academic Press, London, 1991; S.P. Stoylov, S. Sokerov, I. Petkanchin, N. Ibroshev, Dokl. AN URSS 180 (1968) 1165; N.A. Tolstoy, A.A. Spartakov, A.A. Trusov, S.A. Schelkunova, Biofizika 11 (1966) 453; V. Morris, B. Jennings, J. Chem. Soc. Faraday Trans. II 71 (1975) 1948; V. Morris, B. Jennings, J. Colloid Interface Sci. 55 (1978) 313; S.P. Stoylov, V.N. Shilov, S.S. Dukhin, S. Sokerov, I. Petkanchin, in: S.S. Dukhin (Ed.), Electro-optics of Colloids, Naukova Dumka, Kiev, 1977 (in Russian).] based on electro-optic studies are result of incorrect interpretation. Therefore, they should be further ignored.

  20. Studies Directed Toward New and Improved Permanent Magnet Materials.

    Science.gov (United States)

    1994-09-28

    electric motors and generators. At present there are only 3 permanent magnet materials in widespread use - SmCo5, Nd2Fe14B and SmCo5-Sm2Co17. Each has...a third of the effort has been devoted to effecting improvements in existing materials which occur in the SmCo5 or Nd2Fe14B structures. Materials

  1. Induction Motors Versus Permanent-Magnet Actuators for Aerospace Applications

    OpenAIRE

    Kakosimos, Panagiotis E.; Sarigiannidis, Athanasios G.; Beniakar, Minos E.; Kladas, Antonios G.; Gerada, C

    2014-01-01

    This paper introduces a comparative study on the design of aerospace actuators concerning Induction Motor (IM) and Permanent Magnet Motor (PMM) technologies. In the analysis undertaken, the two candidate configurations are evaluated in terms of both their electromagnetic and thermal behavior in a combined manner. On a first step, the basic dimensioning of the actuators and their fundamental operational characteristics are determined via a time-stepping Finite Element (FE) analysis. The consid...

  2. Study of a Mini-Actuator with Permanent Magnets

    Directory of Open Access Journals (Sweden)

    PETRESCU, C.

    2009-10-01

    Full Text Available The paper presents an analytical method for the determination of the magnetic force produced by a mini - actuator with permanent magnets. The results are compared with those obtained by performing a numerical field analysis with COMSOL Multiphysics, showing a very good agreement. The study reveals that the actuator has two equilibrium points, one of which is stable and the other one unstable.

  3. Permanent magnet brushless motor control based on ADRC

    Directory of Open Access Journals (Sweden)

    Li Xiaokun

    2016-01-01

    Full Text Available Permanent magnet brushless motor is a nonlinear system with multiple variables, the mathematical model of Permanent magnet brushless motor is difficult to establish, and since that the classic PID control is hard to precisely control the motor. Active disturbance rejection control (ADRC technique is a new nonlinear controller which does not depend on the system model. It is starting from the classic PID control, and establishing the loop control system by error negative feedback, the ESO(extended state observer observing system which comes from the observer theory of modern control theory to observe internal and external perturbations. ADRC inherits the advantages of PID with little overshoot, high convergence speed, high accuracy, strong anti-interference ability and other characteristics, and it has a strong disturbance adaptability and robustness as for the uncertainty perturbation and their internal disturbance of control objects. Therefore, This paper attempts to use Active disturbance rejection control(ADRC, in order to improve the control of permanent magnet brushless motor. In this design of control system, the simulation of the system is realized based on MATLAB, and then the discrete control algorithm is transplanted to the embedded system to control the permanent magnet brushless DC motor (PMBLDCM. The control system is implemented on the DSP-F28335 digital signal processor, and the DSP also provides the functions like voltage and current AD sampling, PWM driver generation, speed and rotor position calculation, etc. The simulation and experiment results indicate that, the system has good dynamic performance and anti-disturbance performance.

  4. The effect of metal detector gates on implanted permanent pacemakers.

    Science.gov (United States)

    Copperman, Y; Zarfati, D; Laniado, S

    1988-10-01

    The effect of metal detector security gates, such as are used in airports, was tested in 103 nonselected pacemaker patients. Various types of single and dual chamber units were examined, using telemetry during the test. Pulse rate and duration were measured immediately before and after the procedure. No ill effect was seen on any of the units tested, pacemaker inhibition was not observed, and programmability was not affected. Metal detector security gates have no effect on implanted permanent pacemakers.

  5. Venous thromboembolism and subsequent permanent work-related disability.

    Science.gov (United States)

    Braekkan, S K; Grosse, S D; Okoroh, E M; Tsai, J; Cannegieter, S C; Naess, I A; Krokstad, S; Hansen, J-B; Skjeldestad, F E

    2016-10-01

    Essentials The burden of venous thromboembolism (VTE) related to permanent work-related disability is unknown. In a cohort of 66 005 individuals, the risk of work-related disability after a VTE was assessed. Unprovoked VTE was associated with 52% increased risk of work-related disability. This suggests that indirect costs due to loss of work time may add to the economic burden of VTE.

  6. Speed Regulator for Permanent Magnet DC Boring Machine

    Institute of Scientific and Technical Information of China (English)

    2000-01-01

    In this paper a variable-speed system for a loaded permanent magnet direct current boring machine (PMDCBM) is described in details. The voltage adjustment of PMDCBM is accomplished by means of solid state switch with a high gain Darlington transistor. The device designed possesses good variable speed characteristic and Iow loss at low speed. The speed can be regulated automatically to hold at an ideal value according to the load.

  7. DEVELOPMENT OF PERMANENT MECHANICAL REPAIR SLEEVE FOR PLASTIC PIPE

    Energy Technology Data Exchange (ETDEWEB)

    Hitesh Patadia

    2004-09-30

    The report presents a comprehensive summary of the project status related to the development of a permanent mechanical repair fitting intended to be installed on damaged PE mains under blowing gas conditions. Specifically, the product definition has been developed taking into account relevant codes and standards and industry input. A conceptual design for the mechanical repair sleeve has been developed which meets the product definition.

  8. UCLA-KIAE focusing permanent magnet undulator for SASE experiment

    Science.gov (United States)

    Osmanov, N.; Tolmachev, S.; Varfolomeev, A.; Varfolomeev, A. A.; Frigola, P.; Hogan, M.; Pellegrini, C.; Carr, R.; Lidia, S.

    1998-02-01

    A description of a new 2 m undulator is presented which was specially designed and manufactured for a SASE mode FEL experiment. It is a one section two plane focusing permanent magnet construction. The uniform period length is 2.06 cm, total number of periods is 98. The peak field on the axis is 5.4 kG for a 5 mm gap.

  9. Cogging torque mitigation of modular permanent magnet machines

    OpenAIRE

    Li, G. J.; Ren, B.; Zhu, Z-Q.; Li, Y X; Ma, J.

    2015-01-01

    This paper proposes a novel cogging torque mitigation method for modular permanent magnet (PM) machines with flux gaps in alternate stator teeth. The slot openings of the modular PM machines are divided into two groups in a special way. By shifting the slot openings of two groups in opposite directions with the same angle, the machine cogging torque can be significantly reduced. Analytical formula of the desired shift angle is derived, and can be applicable to other modular machines with diff...

  10. Modular Permanent Magnet Machines with Alternate Teeth Having Tooth Tips

    OpenAIRE

    Li, G. J.; Zhu, Z.Q.; Foster, M. P.; Stone, D. A.; Zhan, H.L.

    2015-01-01

    This paper presents single layer modular permanent magnet machines with either wound or unwound teeth with tooth tips. The structures with wound teeth having tooth tips are suitable for modular machines with slot number higher than pole number to compensate for the drop in winding factor due to the flux gaps in alternate stator teeth, accordingly to maintain or even to increase their average torques. However, the structures with unwound teeth having tooth tips are suitable for modular machine...

  11. A permanent magnet electron beam phase-shifter

    Energy Technology Data Exchange (ETDEWEB)

    Novikov, G.A. E-mail: trower@naxs.net; Ermakov, A.N.; Pakhomov, N.I.; Semyachkin, V.K.; Shvedunov, V.I.; Skachkov, V.S.; Tyurin, S.A

    2004-05-21

    We describe here the design and construction of a permanent magnet-based electron beam phase-shifter now operating in our 70 MeV Race-Track Microtron (P. Lucas, S. Webber (Eds.), Proceedings of the 2001 Particle Accelerator Conference, Vol. 4, IEEE, Piscataway, NJ, 2001, p. 2596; L. Gennary (Ed.), Proceedings of the 1995 Particle Accelerator Conference, Vol. 2, IEEE, Piscataway, NJ, 1996, p. 807)

  12. Simulation of dynamics of a permanent magnet linear actuator

    DEFF Research Database (Denmark)

    Yatchev, Ivan; Ritchie, Ewen

    2010-01-01

    Comparison of two approaches for the simulation of the dynamic behaviour of a permanent magnet linear actuator is presented. These are full coupled model, where the electromagnetic field, electric circuit and mechanical motion problems are solved simultaneously, and decoupled model, where first...... flexibility when the actuator response is required to be estimated for different external conditions, e.g. external circuit parameters or mechanical loads....

  13. New atraumatic easy removal technique for permanently cemented crown

    Directory of Open Access Journals (Sweden)

    Pravinkumar G Patil

    2012-01-01

    Full Text Available Removal of a permanently cemented crown or fixed partial denture is a cumbersome procedure for a prosthodontist, especially when there is no purchase point available to remove it. The technique described in this article consists of sectioning of a crown on facial surface followed by removal of the crown with orthodontic plier. This technique does not damage the gingival/periodontal tissues or underlying tooth structure as the crown need not to be removed with jerky back-action force.

  14. Retention of permanent incisors by mesiodens: a family affair.

    Science.gov (United States)

    Gallas, M M; García, A

    2000-01-22

    The term mesiodens refers to a supernumerary tooth that is present in the midline of the maxilla between the two central incisors. One or two mesiodentes may be present. We present a rare case of two sisters, in both of whom a pair of mesiodentes caused the retention of permanent incisors. They were referred to our hospital with asymptomatic delayed eruption of upper incisors. This article is written to point out genetic factors as the possible origin of supernumerary teeth.

  15. Impaction of First Permanent Molars-Case Report.

    Science.gov (United States)

    1982-06-10

    t hwt Iafi ri, t-~ ~ d f .( r 1, , ’ i t d I~’ ’ b ut i. i1 DIS’Rg.,&’ ION IA7E.MENT W.t~ n’e 18. SUPPLEMENTARY NOTES ~ 19. KEY WORDS (Continue on...permanent teeth and related clinical cases. Oral Surg, 1982 (In press). 2. Meade, Sterling V. Incidence of impacted teeth. Int J Orthod 16:885, 1930. 3

  16. Larval salamanders and channel geomorphology are indicators of hydrologic permanence in forested headwater streams

    Science.gov (United States)

    Regulatory agencies need rapid indicators of hydrologic permanence for jurisdictional determinations of headwater streams. Our study objective was to assess the utility of larval salamander presence and assemblage structure and habitat variables for determining stream permanence ...

  17. 78 FR 41125 - Interim Enforcement Policy for Permanent Implant Brachytherapy Medical Event Reporting

    Science.gov (United States)

    2013-07-09

    ... COMMISSION Interim Enforcement Policy for Permanent Implant Brachytherapy Medical Event Reporting AGENCY... Commission (NRC) is issuing an interim Enforcement Policy that allows the staff to exercise enforcement...'s permanent implant brachytherapy program. This interim policy affects NRC licensees that...

  18. The Permanence in a Single Species Nonautonomous System with Delays and Feedback Control

    OpenAIRE

    2010-01-01

    We consider a single species nonautonomous system with delays and feedback control. A general criterion on the permanence for all positive solutions is established. The results show that the feedback control does not influence the permanence of species.

  19. 8 CFR 264.5 - Application for a replacement Permanent Resident Card.

    Science.gov (United States)

    2010-01-01

    ... specified in 8 CFR 103.7(b)(1); except that no fee is required for an application filed pursuant to... evidence of permanent resident status until ordered deported or excluded. Issuance of an Permanent...

  20. 78 FR 76772 - Special Conditions: Airbus Model A350-900 Airplanes; Permanently Installed Rechargeable Lithium...

    Science.gov (United States)

    2013-12-19

    ...; Permanently Installed Rechargeable Lithium-Ion Batteries and Battery Systems AGENCY: Federal Aviation... feature associated with permanently installed rechargeable lithium-ion batteries and battery systems... maximum diversion time. Existing airworthiness regulations did not anticipate the use of...

  1. Build Axial Gradient Field by Using Axial Magnetized Permanent Rings

    Institute of Scientific and Technical Information of China (English)

    2002-01-01

    Axial magnetic field produced by an axial magnetized permanent ring was studied. For two permanent rings, if they are magnetized in the same directions, a nearly uniform axial field can be produced. If they are magnetized in opposite direction,an axial gradient magnetic field can be generated, with the field range changing from -B0 to B0. A permanent magnet with a high axial gradient field was fabricated, the measured results agree with the PANDIRA calculation very well. For wider usage,it is desirable for the field gradient to be changed. Some methods to produce the variable gradient field are presented. These kinds of axial gradient magnetic field can also be used as a beam focusing for linear accelerator if the periodic field can be produced along the beam trajectory. The axial magnetic field is something like a solenoid, large stray field will leak to the outside environment if no method is taken to control them. In this paper, one method is illustrated to shield off the outside leakage field.

  2. Faster sensitivity and non-antimonite permanent photoresist for MEMS

    Science.gov (United States)

    Misumi, Koichi; Saito, Koji; Yamanouchi, Atsushi; Senzaki, Takahiro; Okui, Toshiki; Honma, Hideo

    2006-03-01

    Micro Electro Mechanical Systems (MEMS) is a three-dimensional micro-fabrication technology based on photolithography. The fields of application are extensive and wide-ranging. Among the applications, those that have already acquired a large market include acceleration sensors for airbags of automobiles, pressure sensors for engine control, inkjet printer heads and thin film magnetic heads. The market is expected to further expand in the optic and biology-related fields in the future. In the MEMS field, the packaging accounts for the cost, and it is difficult to standardize due to the low production volume of highly specific technology application. A typical application in the MEMS process would be to conduct plating and etching (Deep RIE) through an intermediate layer of photoresist patterns, but there are cases where the photoresist itself is left therein as a permanent film. A photoresist composed of epoxy resin as the main component can form the permanent film through a catalyst of the optical cationic polymerizating initiator. In general, the optical cationic polymerizating initiator is of onium salt with antimonite as the anion group due to the nature of the hardening rate or the exposure energy. This paper presents the development status of a high sensitivity permanent photoresist made of epoxy resin as the main component with non-antimonite optical cationic polymerizating initiator with concerns to the impact to the environment and material for packaging.

  3. CALCULATION OF INDUCTANCE OF THE INTERIOR PERMANENT MAGNET SYNCHRONOUS MOTOR

    Directory of Open Access Journals (Sweden)

    Phyong Le Ngo

    2017-01-01

    Full Text Available Interior permanent magnet synchronous motor (IPMSM refers to salient-pole synchronous motors, characterized by inequality of inductances of longitudinal (d and transverse (q axes. Electromagnetic torque of IPMSM consists of two components: active torque and reactive torque; the latter depends on inductances of d and q axes. An analytical method to calculate own inductances and mutual inductances of a three-phase IPMSM is presented. Distributed windings of the stator are substituted by equivalent sine distributed windings. An interior permanent magnets rotor is substituted by an equivalent salient-pole rotor. Sections of a magnetic circuit comprising interior permanent magnets, air barriers and steel bridges are substituted by equivalent air-gap. The expressions of the magnetic induction created by current of the stator windings at each point of the air gap as well as of magnetic flux linkage of the stator windings have been obtained. The equations of the self-inductances of phases A, B, C, and of inductance of mutual induction are determined from magnetic flux linkage. The inductance of the d and q axes have been obtained as a result of transformation of the axes abc–dq. The results obtained with the use of the proposed analytical method and the finite element method are presented in the form of a graph; the calculations that have been obtained by these two methods were compared. 

  4. Design and characterization of permanent magnetic solenoids for REGAE

    Energy Technology Data Exchange (ETDEWEB)

    Hachmann, M., E-mail: max.hachmann@desy.de [Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg (Germany); Flöttmann, K. [Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg (Germany); Gehrke, T. [Deutsches Krebsforschungszentrum DKFZ, Im Neuenheimer Feld 280, 69120 Heidelberg (Germany); Mayet, F. [Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg (Germany)

    2016-09-01

    REGAE is a small electron linear accelerator at DESY. In order to focus short and low charged electron bunches down to a few μm permanent magnetic solenoids were designed, assembled and field measurements were done. Due to a shortage of space close to the operation area an in-vacuum solution has been chosen. Furthermore a two-ring design made of wedges has been preferred in terms of beam dynamic issues. To keep the field quality of a piecewise built magnet still high a sorting algorithm for the wedge arrangement including a simple magnetic field model has been developed and used for the construction of the magnets. The magnetic field of these solenoids has been measured with high precision and compared to simulations. - Highlights: • presenting a two-ring radially magnetized permanent magnetic solenoid design. • development of a analytical field description and field quality factor. • development of a sorting algorithm for permanent magnetic pieces to form a magnet. • performing a high-precision field measurement of a high gradient field.

  5. Seismic stability and permanent displacement of landfill along liners

    Institute of Scientific and Technical Information of China (English)

    2008-01-01

    The three-part wedge limit equilibrium method for seismic stability analysis of the landfill along liners is presented. The approximate solutions of the factor of safety and the yield acceleration coefficient are obtained. Parametric studies show that the interface strength of liners, the shear strength of waste and the height of retaining wall can influence the seismic stability of landfill along liners. The density and the shear wave velocity of the field waste are obtained by the borehole investigation and the spectral analysis of surface wave (SASW), respectively. The strain-dependent shear modulus and damping ratio of the artifical waste are obtained by the moderate-scale dynamic triaxial tests. The onedimensional (1D) equivalent linear dynamic response analysis is used to calculate the horizontal equivalent seismic coefficient-time history of the sliding landfill during earthquake. The seismic permanent displacement of the landfill along liners with different site conditons and heights is evaluated by the Newmark method. The catculated results show that ratio of ky /kmax, site conditions, the amplitude and frequency content of the bedrock motion can affect the seismic permanent displacement of the landfill along liners in some degree. Finally, the seismic stability and permanent displacements of three expanded configurations of a certain landfill case are analyzed.

  6. Performance characterization of a permanent-magnet helicon plasma thruster

    Science.gov (United States)

    Takahashi, Kazunori; Charles, Christine; Boswell, Rod

    2012-10-01

    Helicon plasma thrusters operated at a few kWs of rf power is an active area of an international research. Recent experiments have clarified part of the thrust-generation mechanisms. Thrust components which have been identified include an electron pressure inside the source region and a Lorentz force due to an electron diamagnetic drift current and a radial component of the applied magnetic field. The use of permanent magnets (PMs) instead of solenoids is one of the solutions for improving the thruster efficiency because it does not require electricity for the magnetic nozzle formation. Here the thrust imparted from a permanent-magnet helicon plasma thruster is directly measured using a pendulum thrust balance. The source consists of permanent magnet (PM) arrays, a double turn rf loop antenna powered by a 13.56 MHz rf generator and a glass source tube. The PM arrays provide a magnetic nozzle near the open exit of the source and two configurations, which have maximum field strengths of about 100 and 270 G, are tested. A thrust of 15 mN, specific impulse of 2000 sec and a thrust efficiency of 8 percent are presently obtained for 2 kW of input power, 24 sccm flow rate of argon and the stronger magnetic field configuration.

  7. Dairy farming on permanent grassland: can it keep up?

    Science.gov (United States)

    Kellermann, M; Salhofer, K

    2014-10-01

    Based on an extensive data set for southern Germany, we compared the productive performance of dairy farms that operate solely on permanent grassland and dairy farms using fodder crops from arable land. We allowed for heterogeneous production technologies and identified more intensive and extensive production systems for both types of farms, whereby we based our notion of intensive versus extensive dairy production on differences in stocking density and milk yield per cow and year. To be able to compare the productivity levels and productivity developments of the various groups of farms, we developed a group- and chain-linked multilateral productivity index. We also analyzed how technical change, technical efficiency change, and a scale change effect contribute to productivity growth between the years 2000 and 2008. Our results revealed that permanent grassland farms can generally keep up with fodder-crop farms, even in an intensive production setting. However, extensively operating farms, especially those on permanent grassland, significantly lag behind in productivity and productivity change and run the risk of losing ground.

  8. Seismic stability and permanent displacement of landfill along liners

    Institute of Scientific and Technical Information of China (English)

    CHEN YunMin; GAO Deng; ZHU Bin; CHEN RenPeng

    2008-01-01

    The three-part wedge limit equilibrium method for seismic stability analysis of the landfill along liners is presented. The approximate solutions of the factor of safety and the yield acceleration coefficient are obtained. Parametric studies show that the interface strength of liners, the shear strength of waste and the height of retaining wall can influence the seismic stability of landfill along liners. The density and the shear wave velocity of the field waste are obtained by the borehole investigation and the spectral analysis of surface wave (SASW), respectively. The strain-dependent shear modulus and damping ratio of the artifical waste are obtained by the moderate-scale dynamic triaxial tests. The one- dimensional (1D) equivalent linear dynamic response analysis is used to calculate the horizontal equivalent seismic coefficient-time history of the sliding landfill during earthquake. The seismic permanent displacement of the landfill along liners with different site conditons and heights is evaluated by the Newmark method. The catculated results show that ratio of ky/kmax, site conditions, the amplitude and frequency content of the bedrock motion can affect the seismic permanent displacement of the landfill along liners in some degree. Finally, the seismic stability and permanent displacements of three expanded configurations of a certain landfill case are analyzed.

  9. Rotating permanent magnet excitation for blood flow measurement.

    Science.gov (United States)

    Nair, Sarath S; Vinodkumar, V; Sreedevi, V; Nagesh, D S

    2015-11-01

    A compact, portable and improved blood flow measurement system for an extracorporeal circuit having a rotating permanent magnetic excitation scheme is described in this paper. The system consists of a set of permanent magnets rotating near blood or any conductive fluid to create high-intensity alternating magnetic field in it and inducing a sinusoidal varying voltage across the column of fluid. The induced voltage signal is acquired, conditioned and processed to determine its flow rate. Performance analysis shows that a sensitivity of more than 250 mV/lpm can be obtained, which is more than five times higher than conventional flow measurement systems. Choice of rotating permanent magnet instead of an electromagnetic core generates alternate magnetic field of smooth sinusoidal nature which in turn reduces switching and interference noises. These results in reduction in complex electronic circuitry required for processing the signal to a great extent and enable the flow measuring device to be much less costlier, portable and light weight. The signal remains steady even with changes in environmental conditions and has an accuracy of greater than 95%. This paper also describes the construction details of the prototype, the factors affecting sensitivity and detailed performance analysis at various operating conditions.

  10. Dynamics of Permanent-Magnet Biased Active Magnetic Bearings

    Science.gov (United States)

    Fukata, Satoru; Yutani, Kazuyuki

    1996-01-01

    Active magnetic radial bearings are constructed with a combination of permanent magnets to provide bias forces and electromagnets to generate control forces for the reduction of cost and the operating energy consumption. Ring-shaped permanent magnets with axial magnetization are attached to a shaft and share their magnet stators with the electromagnets. The magnet cores are made of solid iron for simplicity. A simplified magnetic circuit of the combined magnet system is analyzed with linear circuit theory by approximating the characteristics of permanent magnets with a linear relation. A linearized dynamical model of the control force is presented with the first-order approximation of the effects of eddy currents. Frequency responses of the rotor motion to disturbance inputs and the motion for impulsive forces are tested in the non-rotating state. The frequency responses are compared with numerical results. The decay of rotor speed due to magnetic braking is examined. The experimental results and the presented linearized model are similar to those of the all-electromagnetic design.

  11. The effects of impacted premaxillary supernumerary teeth on permanent incisors

    Energy Technology Data Exchange (ETDEWEB)

    Jung, Yun Hoa; Kim, Ji Yeon; Cho, Bong Hae [School of Dentistry, Pusan National University, Yangsan (Korea, Republic of)

    2016-12-15

    The aim of this study was to examine the radiographic features associated with impacted premaxillary supernumerary teeth, to determine the relationship between their characteristics and their effects on permanent incisors, and to investigate the types of orthodontic treatment that patients received after the extraction of impacted supernumerary teeth. The clinical records and radiographs of 193 patients whose impacted premaxillary supernumerary teeth were removed were retrospectively reviewed, and 241 impacted supernumerary teeth were examined. Cone-beam computed tomographic images and panoramic radiographs were examined to determine the number, location, sagittal position, orientation, and morphology of the supernumerary teeth. Their effects on permanent incisors and the orthodontic treatment received by patients after the extraction of the supernumeraries were also investigated. Supernumerary teeth were most frequently observed in the central incisor region, in the palatal position, in the inverted orientation, and were most commonly conical in shape. The most common complication was median diastema, followed by displacement and delayed eruption of the adjacent incisors. Ten (71.4%) of the 14 odontomas showed delayed eruption of the adjacent incisors. Displacement of the incisors was more frequently observed in association with supernumerary teeth with tuberculate or supplemental shapes. Orthodontic traction was most frequently performed after the removal of odontomas. In 32 cases (13.3%), permanent incisors erupted after the orthodontic creation of sufficient space. Median diastema was most common complication. The delayed eruption of incisors was common in supernumerary teeth with a vertical orientation and an odontoma shape.

  12. Pullback permanence for non-autonomous partial differential equations

    Directory of Open Access Journals (Sweden)

    Jose A. Langa

    2002-08-01

    Full Text Available A system of differential equations is permanent if there exists a fixed bounded set of positive states strictly bounded away from zero to which, from a time on, any positive initial data enter and remain. However, this fact does not happen for a differential equation with general non-autonomous terms. In this work we introduce the concept of pullback permanence, defined as the existence of a time dependent set of positive states to which all solutions enter and remain for suitable initial time. We show this behaviour in the non-autonomous logistic equation $u_{t}-Delta u=lambda u-b(tu^{3}$, with $b(t>0$ for all $tin mathbb{R}$, $lim_{to infty }b(t=0$. Moreover, a bifurcation scenario for the asymptotic behaviour of the equation is described in a neighbourhood of the first eigenvalue of the Laplacian. We claim that pullback permanence can be a suitable tool for the study of the asymptotic dynamics for general non-autonomous partial differential equations.

  13. Bonded permanent magnets: Current status and future opportunities (invited)

    Science.gov (United States)

    Ormerod, John; Constantinides, Steve

    1997-04-01

    Permanent magnets play a vital role in modern society as a component in a wide range of devices utilized by many industries and consumers. In 1995, the world production of permanent magnets was estimated to be valued at 3.6 billion and growing at an annual rate of 12%. Bonded permanent magnets are the fastest growing segment of this market. Bonded magnet technology enables a wide variety of magnetic powders to be combined with several polymer and binder systems to produce magnetic components utilizing several processing options. In this article, we review the development of bonded magnet technology. The major classes of magnetic powders, binder systems, and processing technologies are described. Recent developments in magnetic material grades, e.g., anisotropic NdFeB, rare earth lean NdFeB, SmFe(N,C) are outlined. The current status of processing and binder options aimed at increasing the upper application temperature limit of these materials is highlighted. Finally, the improvements and future opportunities for bonded magnets are discussed.

  14. The effects of impacted premaxillary supernumerary teeth on permanent incisors

    Science.gov (United States)

    Jung, Yun-Hoa; Kim, Ji-Yeon

    2016-01-01

    Purpose The aim of this study was to examine the radiographic features associated with impacted premaxillary supernumerary teeth, to determine the relationship between their characteristics and their effects on permanent incisors, and to investigate the types of orthodontic treatment that patients received after the extraction of impacted supernumerary teeth. Materials and Methods The clinical records and radiographs of 193 patients whose impacted premaxillary supernumerary teeth were removed were retrospectively reviewed, and 241 impacted supernumerary teeth were examined. Cone-beam computed tomographic images and panoramic radiographs were examined to determine the number, location, sagittal position, orientation, and morphology of the supernumerary teeth. Their effects on permanent incisors and the orthodontic treatment received by patients after the extraction of the supernumeraries were also investigated. Results Supernumerary teeth were most frequently observed in the central incisor region, in the palatal position, in the inverted orientation, and were most commonly conical in shape. The most common complication was median diastema, followed by displacement and delayed eruption of the adjacent incisors. Ten (71.4%) of the 14 odontomas showed delayed eruption of the adjacent incisors. Displacement of the incisors was more frequently observed in association with supernumerary teeth with tuberculate or supplemental shapes. Orthodontic traction was most frequently performed after the removal of odontomas. In 32 cases (13.3%), permanent incisors erupted after the orthodontic creation of sufficient space. Conclusion Median diastema was most common complication. The delayed eruption of incisors was common in supernumerary teeth with a vertical orientation and an odontoma shape. PMID:28035303

  15. Percutaneous Extraction of Transvenous Permanent Pacemaker/Defibrillator Leads

    Directory of Open Access Journals (Sweden)

    Stylianos Paraskevaidis

    2014-01-01

    Full Text Available Background. Widespread use of cardiovascular implantable electronic devices has inevitably increased the need for lead revision/replacement. We report our experience in percutaneous extraction of transvenous permanent pacemaker/defibrillator leads. Methods. Thirty-six patients admitted to our centre from September 2005 through October 2012 for percutaneous lead extraction were included. Lead removal was attempted using Spectranetics traction-type system (Spectranetics Corp., Colorado, CO, USA and VascoExtor countertraction-type system (Vascomed GmbH, Weil am Rhein, Germany. Results. Lead extraction was attempted in 59 leads from 36 patients (27 men, mean ± SD age 61±5 years, with permanent pacemaker (n=25, defibrillator (n=8, or cardiac resynchronisation therapy (n=3 with a mean ± SD implant duration of 50±23 months. The indications for lead removal included pocket infection (n=23, endocarditis (n=2, and ventricular (n=10 and atrial lead dysfunction (n=1. Traction device was used for 33 leads and countertraction device for 26 leads. Mean ± SD fluoroscopy time was 4±2 minutes/lead for leads implanted 48 months (n=21, P=0.03. Complete procedural success rate was 91.7% and clinical procedural success rate was 100%, while lead procedural success rate was 95%. Conclusions. In conclusion, percutaneous extraction of transvenous permanent pacemaker/defibrillator leads using dedicated removal tools is both feasible and safe.

  16. Design, manufacture and measurements of permanent dipole magnets for DIRAC

    CERN Document Server

    Vorozhtsov, A; Kasaei, S; Solodko, E; Thonet, P A; Tommasini, D

    2013-01-01

    The one of the aim of the DIRAC experiment is the observation of the long-lived π+π- atoms, using the proton beam of the CERN Proton Synchrotron [1]. Two dipole magnets are needed for the for the DIRAC experiment as high resolution spectrometers. The dipole magnet will be used to identify the long-lived atoms on the high level background of π+π- pairs produced simultaneously with π+π- atoms. The proposed design is a permanent magnet dipole with a mechanical aperture of 60 mm. The magnet, of a total physical length of 66 mm, is based on Sm2Co17 blocks and provides an integrated field strength of 24·10-3 T×m. The Sm2Co17 was chosen as a material for the permanent magnet blocks due to its radiation hardness and weaker temperature dependence. The magnetic field quality is determined by 2 ferromagnetic poles, aligned together with the permanent magnets blocks. The paper describes the design, manufacture and magnetic measurements of the magnets.

  17. Some Character of Application of Nd-Fe-B Permanent Magnet

    Institute of Scientific and Technical Information of China (English)

    2000-01-01

    The character of application of Nd-Fe-B permanent magnet is characterized in an irreversible loss of magnetic flux in the various environment conditions. According to the size of permanent magnet in the various environment conditions the irreversible loss of the permanent magnets is very different. Therefore, the irreversible loss and the application method according to the size of permanent magnets and the intervals in the magnetic system are discussed.

  18. Simulation on Magnetic Field Characteristics of Permanent-Magnet Seed-Metering Device

    OpenAIRE

    Wang, Jing; Hu, Jianping; Wang, Qirui; Wang, Xun

    2011-01-01

    Part 1: Simulation, Optimization, Monitoring and Control Technology; International audience; The cylindrical permanent magnet is the core part of the permanent-magnet seed-metering device, it can absorb single magnetic powder coated seed. The first, the magnetic induction intensity model of any point in the cylindrical permanent magnet external was established based on the equivalent current model of permanent magnet. The second, the mathematical formula was derived using the Biot-Savart law ...

  19. 49 CFR 192.717 - Transmission lines: Permanent field repair of leaks.

    Science.gov (United States)

    2010-10-01

    ... 49 Transportation 3 2010-10-01 2010-10-01 false Transmission lines: Permanent field repair of... § 192.717 Transmission lines: Permanent field repair of leaks. Each permanent field repair of a leak on a transmission line must be made by— (a) Removing the leak by cutting out and replacing...

  20. Performance Comparison of Permanent Magnet Linear Actuators of Different Mover Types

    DEFF Research Database (Denmark)

    Ritchie, Ewen; Hinov, K.; Yatchev, I.

    2006-01-01

    A comparative study of permanent magnet linear actuators with different location of the permanent magnet is reported. Three mover types are considered - soft magnetic mover, permanent magnet mover and hybrid mover. Force-stroke characteristics are obtained with the help of finite element models...

  1. OVERVIEW AND CLASSIFICATION OF PERMANENT OFFSHORE PLATFORMS FOR WORKING IN ICE CONDITIONS

    OpenAIRE

    Mr. Nikolay A. Taranukha; Mr Andrey S. Mironov

    2016-01-01

    This article is dedicated to permanent offshore platforms for working in ice conditions. The authors focus on creating constructions for working in ice conditions. The article presents drawings of ice-resistant permanent offshore platforms according to their attachment to the seabed. The article also describes the scheme of the general arrangement of the ice-resistant tetrahedral permanent offshore platforms.

  2. Permanence of a Single Species System with Distributed Time Delay and Feedback Control

    Directory of Open Access Journals (Sweden)

    Yali Shen

    2012-01-01

    Full Text Available We study the permanence of a classofsingle species system with distributed time delay and feedback controls. General criteria on permanence are established in this paper. A very important fact is found in our results; that is, the feedback control is harmless to the permanence of species.

  3. Assessing Variation in Permanence/Pragmatism Orientations: Implications for Marital Stability.

    Science.gov (United States)

    Morgan, Mary Y.; Scanzoni, John

    1987-01-01

    Traces history of construct known as "permanent availability,""universal availability," and "permanence/pragmatism." Connects latter with emerging research tradition labeled "causes and consequences of divorce." Based on data collected from college students, constructed an index of permanence/pragmatism in close relationship. (Author)

  4. 77 FR 39924 - Effective Date of Requirement for Premarket Approval for Cardiovascular Permanent Pacemaker...

    Science.gov (United States)

    2012-07-06

    ... Approval for Cardiovascular Permanent Pacemaker Electrode AGENCY: Food and Drug Administration, HHS. ACTION... protocol (PDP) for the cardiovascular permanent pacemaker electrode. The Agency has summarized its findings... cardiovascular permanent pacemaker electrode. In accordance with section 515(b)(2)(A) of the FD&C Act, FDA...

  5. 36 CFR 1237.12 - What record elements must be created and preserved for permanent audiovisual records?

    Science.gov (United States)

    2010-07-01

    ... created and preserved for permanent audiovisual records? 1237.12 Section 1237.12 Parks, Forests, and Public Property NATIONAL ARCHIVES AND RECORDS ADMINISTRATION RECORDS MANAGEMENT AUDIOVISUAL, CARTOGRAPHIC... permanent audiovisual records? For permanent audiovisual records, the following record elements must...

  6. Paired-permanent approach for VB theory (II) -An ab initio spin-free VB program

    Institute of Scientific and Technical Information of China (English)

    2001-01-01

    Paired-permanent approach for VB theory is extensively developed. Canonical expan sion of a paired-permanent is deduced. Furthermore, it is shown that a paired-permanent may be expressed in terms of the products of sub-paired-permanents of any given order and their corre sponding minors. An ab initio spin-free valence bond program, called Xiamen, is implemented by using paired-permanent approach. Test calculation shows that Xiamen package is more efficient than some other programs based on the traditional VB algorithm, and it provides a new practical tool for quantum chemistry.

  7. Combinatorial investigation of rare-earth free permanent magnets

    Science.gov (United States)

    Fackler, Sean Wu

    The combinatorial high throughput method allows one to rapidly study a large number of samples with systematically changing parameters. We apply this method to study Fe-Co-V alloys as alternatives to rare-earth permanent magnets. Rare-earth permanent magnets derive their unmatched magnetic properties from the hybridization of Fe and Co with the f-orbitals of rare-earth elements, which have strong spin-orbit coupling. It is predicted that Fe and Co may also have strong hybridization with 4d and 5d refractory transition metals with strong spin-orbit coupling. Refractory transition metals like V also have the desirable property of high temperature stability, which is important for permanent magnet applications in traction motors. In this work, we focus on the role of crystal structure, composition, and secondary phases in the origin of competitive permanent magnetic properties of a particular Fe-Co-V alloy. Fe38Co52V10, compositions are known as Vicalloys. Fe-CoV composition spreads were sputtered onto three-inch silicon wafers and patterned into discrete sample pads forming a combinatorial library. We employed highthroughput screening methods using synchrotron X-rays, wavelength dispersive spectroscopy, and magneto-optical Kerr effect (MOKE) to rapidly screen crystal structure, composition, and magnetic properties, respectively. We found that in-plane magnetic coercive fields of our Vicalloy thin films agree with known bulk values (300 G), but found a remarkable eight times increase of the out-of-plane coercive fields (˜2,500 G). To explain this, we measured the switching fields between in-plane and out-of-plane thin film directions which revealed that the Kondorsky model of 180° domain wall reversal was responsible for Vicalloy's enhanced out-of-plane coercive field and possibly its permanent magnetic properties. The Kondorsky model suggests that domain-wall pinning is the origin of Vicalloy's permanent magnetic properties, in contrast to strain, shape, or

  8. Improvement of azimuthal homogeneity in permanent-magnet bearing rotors

    Science.gov (United States)

    Hull, J. R.; Rossing, T. D.; Mulcahy, T. M.; Uherka, K. L.

    1992-10-01

    Permanent magnets that are levitated and rotating over a bulk high-temperature superconductor (HTS) form the basis of many superconducting bearing designs. Experiments have shown that the rotational-loss 'coefficient of friction' for thrust bearings of this type can be as low as 8 x 10(exp -6). While the loss mechanisms of such bearings are not well understood, the azimuthal homogeneity of the rotating permanent magnet is believed to play an important role in determining the loss. One possible loss mechanism is magnetic hysteresis in the HTS, where the energy loss E per cycle is derived from the critical state model and given by E = K (Delta B)(sup 3)/J(sub c) where K is a geometric coefficient, Delta B is the variation in magnetic field at the surface of the HTS experienced during a rotation of the levitated magnet, and J(sub c) is the critical current density of the HTS. It is clear that a small decrease in Delta B (i.e., decreasing the azimuthal inhomogeneity of the rotating magnetic field) could have profound effects on decreasing E and the rotational coefficient of friction. The role of Delta B is also expected to be significant in reducing losses from eddy currents and other mechanisms. Low rotational losses in HTS bearings have been demonstrated only for levitated masses of several grams. For practical bearings, it is important to obtain these low losses with larger levitated masses. There are two main routes toward decreasing Delta B. The first is to improve the alignment of the magnetic particles during fabrication and to maintain close tolerances on grinding angles during manufacture of the permanent magnet. The second, the subject of this paper, is to provide correctional procedures after the magnet is fabricated.

  9. Asymmetry in development (mineralisation of permanent mandibular canine roots

    Directory of Open Access Journals (Sweden)

    Burić Mirjana V.

    2012-01-01

    Full Text Available Introduction. The development of the teeth is closely associated with the proper and unobstructed physical and psychological development of the child. Aim. To determine the existence of asymmetry in the development of the roots of the lower permanent canine teeth in different age groups of children of both sexes. Material and methods. The study was conducted on 523 ortopantomograms (253 boys and 270 girls of orthodontic patients aged 6 to 14 years of the Dental Clinic in Niš. We analyzed the development of asymmetry in the lower permanent canine root, using the method of Gleiser and Hunt, or the modification by Tijanić (1981. Results. It was found that asymmetry in the development of the root in both sexes of the lower canine teeth was present in 20 patients (3.82%, 10 boys (3.95% and 10 girls (3.70%. The difference is in the range of one stage. Asymmetric development of the roots of the lower incisors in girls and boys usually present in the 7th and 8th stages (60% in girls and in 50% in boys. In 90% of girls in developing asymmetry the root of the lower canine is present in a single stage, and in 10% of girls it presents within three stages. Asymmetric development of the root of the lower canine is the most common in the 7th and 8th stages of development (55%. Conclusion. Asymmetric root development of permanent lower canines was found in 3.82% of patients. More than half of respondents (55% had asymmetrical canine root development stage in half and three quarters of the total root length. The results of this study indicate that the canine is the tooth with very little variations in its development.

  10. The first metazoa living in permanently anoxic conditions

    Directory of Open Access Journals (Sweden)

    Heiner Iben

    2010-04-01

    Full Text Available Abstract Background Several unicellular organisms (prokaryotes and protozoa can live under permanently anoxic conditions. Although a few metazoans can survive temporarily in the absence of oxygen, it is believed that multi-cellular organisms cannot spend their entire life cycle without free oxygen. Deep seas include some of the most extreme ecosystems on Earth, such as the deep hypersaline anoxic basins of the Mediterranean Sea. These are permanently anoxic systems inhabited by a huge and partly unexplored microbial biodiversity. Results During the last ten years three oceanographic expeditions were conducted to search for the presence of living fauna in the sediments of the deep anoxic hypersaline L'Atalante basin (Mediterranean Sea. We report here that the sediments of the L'Atalante basin are inhabited by three species of the animal phylum Loricifera (Spinoloricus nov. sp., Rugiloricus nov. sp. and Pliciloricus nov. sp. new to science. Using radioactive tracers, biochemical analyses, quantitative X-ray microanalysis and infrared spectroscopy, scanning and transmission electron microscopy observations on ultra-sections, we provide evidence that these organisms are metabolically active and show specific adaptations to the extreme conditions of the deep basin, such as the lack of mitochondria, and a large number of hydrogenosome-like organelles, associated with endosymbiotic prokaryotes. Conclusions This is the first evidence of a metazoan life cycle that is spent entirely in permanently anoxic sediments. Our findings allow us also to conclude that these metazoans live under anoxic conditions through an obligate anaerobic metabolism that is similar to that demonstrated so far only for unicellular eukaryotes. The discovery of these life forms opens new perspectives for the study of metazoan life in habitats lacking molecular oxygen.

  11. Routine chest radiography after permanent pacemaker implantation: Is it necessary?

    Directory of Open Access Journals (Sweden)

    Edwards N

    2005-01-01

    Full Text Available Background and Aims: Chest radiographs (CXRs are performed routinely after permanent pacemaker implantation to identify pacemaker lead position and exclude pneumothorax. We assessed the clinical value and need for this procedure. Design: Retrospective analysis of pacemaker data and CXRs following permanent pacemaker insertion between December 2002 and February 2004. Materials and Methods: Post-procedural CXRs were available in 125/126 consecutive patients after either first endocardial pacemaker implantation or insertion of at least one new lead. Subclavian vein puncture was used for venous access in all cases. CXRs were examined to establish the incidence of pneumothorax and assess pacing lead positions. The clinical records were examined in all patients who had subsequent CXRs or a further pacemaker procedure to identify the indication for these and to establish whether CXR had influenced patient management. Results: In total, 192 post-procedural CXRs were performed, either postero-anterior (PA and/or lateral views. Ventricular and/or atrial pacing lead contour and electrode position was considered radiographically appropriate in 86% CXRs. Fourteen per cent of post-procedural radiographs were considered to have radiologically sub-optimal pacemaker lead positioning. None of the patients with these "abnormal" radiographs experienced subsequent pacemaker complications or had further radiographs recorded at a later date. Later repeat CXRs were performed in 16 patients (13% but only 3 patients (2% had pacing abnormalities as the primary indication. All three had satisfactory pacing lead position on initial post-implantation and later radiographs, but required further procedures for lead re-positioning. Iatrogenic pneumothorax occurred in one patient (incidence 0.8% in our series. CXR confirmed the clinical diagnosis and allowed an assessment of size to guide treatment. Conclusion: Routine CXR after permanent pacemaker insertion is not necessary in

  12. Traumatic injuries to permanent teeth in Turkish children, Ankara.

    Science.gov (United States)

    Altun, Ceyhan; Ozen, Buğra; Esenlik, Elçin; Guven, Günseli; Gürbüz, Taşkin; Acikel, Cengizhan; Basak, Feridun; Akbulut, Erman

    2009-06-01

    The aim of this study was to identify the types and etiologies of dento-alveolar injuries among patients who were treated for injuries to maxillary and/or mandibular permanent teeth at the Gulhane Medical Academy, Department of Pediatric Dentistry, Center of Dental Sciences in Ankara, Turkey to provide a basis for determining optimal treatment approaches and educational needs. From a total of 4956 children aged 6-12 years (mean age: 8.91 +/- 1.95) applying to the Center, 472 children (9.5%) were found to have suffered dental injuries during a period of 2 years. Injuries were classified according to drawings and texts based on the WHO classification system, as modified by Andreasen and Andreasen. Injury rates were highest among children age 6 and ages 8-10. The most frequently injured permanent teeth were the maxillary central incisors (88.2%), and the maxillary right central permanent incisor made up 47.2% of all injured teeth. The most common cause of dental trauma was falling while walking or running (40.3%). Most injuries involved a single tooth (64.8%). The most common type of injury was enamel fracture (44.6%). There was a significant difference in gender, where boys more often suffered from a dental hard tissue and pulp injury than girls (P = 0.019), whereas there was no difference in gender (P = 0.248) in the distribution of periodontal injuries. Injuries were found to occur more frequently during the summer (P trauma, preventive orthodontic treatment in early mixed dentition may play an important role in reducing traumatic dental injuries.

  13. Analysis of the mineral composition of hypomineralized first permanent molars

    Directory of Open Access Journals (Sweden)

    Martinović Brankica

    2015-01-01

    Full Text Available Background/Aim. Hypomineralization of molars and incisors (molar-incisor hypomineralization - MIH is defined as enamel hypomineralization of systemic origin of one or more of the four first permanent molars, which may be associated with changes in the maxillary, and less frequently in the permanent mandibular incisors. The aim of this study was to investigate the mineral content in hypomineralized teeth as a contribution to under-standing the origin of these changes, which will be important for effective restorative approach. Methods. A total of 10 extracted first permanent molars diagnosed with MIH were used in the study as the experimental group, and intact first premolars extracted for orthodontic reasons were used as the control group. A certain surface of hypomineralized аnd healthy enamel and dentin was analyzed using a scanning electron microscope equipped with an energydispersive spectrometer (SEM/EDS. Results. By conducting quantitative chemical analysis of the distribution of the basic chemical elements, it was found that the concentration of calcium (Ca and phosphorus (P was significantly higher in healthy enamel (Ca = 28.80 wt%, and P = 15.05 wt% compared to hypomineralized enamel (Ca = 27.60 wt% and P = 14.32 wt%. Carbon (C concentration was statistically significantly higher in hypomineralized enamel (C = 11.70 wt% compared to healthy enamel (C = 10.94 wt%. Hypomineralized and healthy enamel did not differ significantly regarding the ratio of calcium and phosphorus concentrations whereas the ratio of calcium and carbon concentrations was statistically significantly higher in healthy enamel compared to hypomineralized enamel. Conclusion. Concentration of the main chemical elements, primarily calcium and phosphorus, is significantly reduced in hypomineralized enamel whereas carbon concentration is increased compared to healthy enamel.

  14. Method for forming permanent magnets with different polarities for use in microelectromechanical devices

    Science.gov (United States)

    Roesler, Alexander W.; Christenson, Todd R.

    2007-04-24

    Methods are provided for forming a plurality of permanent magnets with two different north-south magnetic pole alignments for use in microelectromechanical (MEM) devices. These methods are based on initially magnetizing the permanent magnets all in the same direction, and then utilizing a combination of heating and a magnetic field to switch the polarity of a portion of the permanent magnets while not switching the remaining permanent magnets. The permanent magnets, in some instances, can all have the same rare-earth composition (e.g. NdFeB) or can be formed of two different rare-earth materials (e.g. NdFeB and SmCo). The methods can be used to form a plurality of permanent magnets side-by-side on or within a substrate with an alternating polarity, or to form a two-dimensional array of permanent magnets in which the polarity of every other row of the array is alternated.

  15. Effect of permanent-magnet irregularities in levitation force measurements.

    Energy Technology Data Exchange (ETDEWEB)

    Hull, J. R.

    1999-10-14

    In the measurement of the levitation force between a vertically magnetized permanent magnet (PM) and a bulk high-temperature superconductor (HTS), PM domains with horizontal components of magnetization are shown to produce a nonnegligible contribution to the levitation force in most systems. Such domains are typically found in all PMs, even in those that exhibit zero net horizontal magnetic moment. Extension of this analysis leads to an HTS analog of Earnshaw's theorem, in which at the field-cooling position the vertical stiffness is equal to the sum of the horizontal stiffnesses, independent of angular distribution of magnetic moments within the PM.

  16. Simulation of dynamics of a permanent magnet linear actuator

    DEFF Research Database (Denmark)

    Yatchev, Ivan; Ritchie, Ewen

    2010-01-01

    Comparison of two approaches for the simulation of the dynamic behaviour of a permanent magnet linear actuator is presented. These are full coupled model, where the electromagnetic field, electric circuit and mechanical motion problems are solved simultaneously, and decoupled model, where first...... a set of static magnetic filed analysis is carried out and then the electric circuit and mechanical motion equations are solved employing bi-cubic spline approximations of the field analysis results. The results show that the proposed decoupled model is of satisfactory accuracy and gives more...

  17. Effect of permanent-magnet irregularities in levitation force measurements

    Science.gov (United States)

    Hull, John R.

    2000-06-01

    In the measurement of the levitation force between a vertically magnetized permanent magnet (PM) and a bulk high-temperature superconductor (HTS), PM domains with horizontal components of magnetization are shown to produce a non-negligible contribution to the levitation force in most systems. Such domains are typically found in all PMs, even in those that exhibit zero net horizontal magnetic moment. Extension of this analysis leads to an HTS analogue of Earnshaw's theorem, in which the vertical stiffness is equal to the sum of the horizontal stiffness at the field-cooling position, independent of the angular distribution of magnetic moments within the PM.

  18. Effect of permanent-magnet irregularities in levitation force measurements

    Energy Technology Data Exchange (ETDEWEB)

    Hull, John R. [Energy Technology Division, Argonne National Laboratory, Argonne, IL 60439 (United States)

    2000-06-01

    In the measurement of the levitation force between a vertically magnetized permanent magnet (PM) and a bulk high-temperature superconductor (HTS), PM domains with horizontal components of magnetization are shown to produce a non-negligible contribution to the levitation force in most systems. Such domains are typically found in all PMs, even in those that exhibit zero net horizontal magnetic moment. Extension of this analysis leads to an HTS analogue of Earnshaw's theorem, in which the vertical stiffness is equal to the sum of the horizontal stiffness at the field-cooling position, independent of the angular distribution of magnetic moments within the PM. (author)

  19. [Spontaneous loss of permanent teeth in children is never innocent].

    Science.gov (United States)

    Wit, M A; van der Meij, E H; Hooimeijer, L H; de Vries, T W

    2013-06-01

    A 13-year-old patient spontaneously lost tooth 47. In addition, he had for several weeks experienced numbness of the lower lip and the chin on the right side, fatigue, weakness, loss of appetite, and weight loss. After extensive investigation he seemed to be suffering from a Burkitt lymphoma. Spontaneous loss of permanent teeth in children has an extensive differential diagnosis. Dentists should be familiar with this differential diagnosis as all possible diagnoses are related to serious pathologies. The differential diagnosis includes infectious, metabolic, naplastic, and odontogenic causes. Systematic history taking, physical examination and laboratory investigations will lead to a proper diagnosis.

  20. Five design options for permanent total enclosures (PTEs)

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    1997-12-31

    This paper discusses how companies in the printing industry are looking more to the use of permanent total enclosures (PTEs) as a means to demonstrate compliance with new Clean Air Act standards for hazardous air pollutants. The advantages of this method is that by following design guidelines and meeting the EPA five point criteria for a fully enclosed room, then one may assume 100% capture of contaminants. This factor often raises the advantages of this method over other control methods which put the responsibility upon the user to demonstrate compliance with required control levels.

  1. A mesoscopic network model for permanent set in crosslinked elastomers

    Energy Technology Data Exchange (ETDEWEB)

    Weisgraber, T H; Gee, R H; Maiti, A; Clague, D S; Chinn, S; Maxwell, R S

    2009-01-29

    A mesoscopic computational model for polymer networks and composites is developed as a coarse-grained representation of the composite microstructure. Unlike more complex molecular dynamics simulations, the model only considers the effects of crosslinks on mechanical behavior. The elastic modulus, which depends only on the crosslink density and parameters in the bond potential, is consistent with rubber elasticity theory, and the network response satisfies the independent network hypothesis of Tobolsky. The model, when applied to a commercial filled silicone elastomer, quantitatively reproduces the experimental permanent set and stress-strain response due to changes in the crosslinked network from irradiation.

  2. Confronting the Consequences of a Permanent Changing Environment

    Directory of Open Access Journals (Sweden)

    Raluca Ioana Vosloban

    2013-05-01

    Full Text Available Businesses and governments choose how they wish to deal with change. Whether this change is organizational, technological, political, financial etc or even individual pursuing actions as usual is likely to lead to a downward path. The authors of this paper are giving a set of tools for confronting and understanding the consequences of this era of permanent changes by building strengths and seeking opportunities within organizations (private or public and within family (including friends. The work environment and the personal life of the individual have a common point which is adaptability, coping efficiently with changes, a demanded ability of the 3rd millennium human being.

  3. Permanent magnetic ferrite based power-tunable metamaterials

    Science.gov (United States)

    Zhang, Guanqiao; Lan, Chuwen; Gao, Rui; Zhou, Ji

    2017-08-01

    Power-tunable metamaterials based on barium permanent magnetic ferrite have been proposed and fabricated in this research. Scattering parameter measurements confirm a shift in resonant frequency in correlation to changes in incident electromagnetic power within microwave frequency band. The tunable phenomenon represented by a blue-shift in transmission spectra in the metamaterials array can be attributed to a decrease in saturation magnetization resulting from FMR-induced temperature elevation upon resonant conditions. This power-dependent behavior offers a simple and practical route towards dynamically fine-tunable ferrite metamaterials.

  4. Permanent Magnetic Synchronous Motor Control System Based on ADRC

    Directory of Open Access Journals (Sweden)

    Song Wang

    2013-06-01

    Full Text Available Permanent magnetic synchronous motor (PMSM is a strong coupling and non-linear system. In the PMSM speed-regulation system, PID controller is the conventional one, it is difficult to decide the parameters of PID. Moreover, the performance of PID controller is not very well in large disturbance. In the paper, the Active Disturbance Rejection Controller (ADRC is applied to the PMSM speed-regulation system. The result of simulations and experiments show that this algorithm has better anti-load-disturbance performance than PID controller.

  5. Permanent start-up instrumentation for maintenance outages

    Energy Technology Data Exchange (ETDEWEB)

    Cuttler, J.M. [Cuttler and Associates Inc., Mississauga, Ontario (Canada); Nasimi, E.; Gill, H.; Scrannage, R.; Paquette, P. [Bruce Power, Tiverton, Ontario (Canada)

    2011-07-01

    This paper assesses the need and feasibility of permanent start-up instrumentation detectors to monitor photoneutron flux during maintenance outages. CANDU ion chamber systems were designed to remain on scale for ten weeks after reactor shutdown. A requirement was imposed in the mid-1990s to put the reactor into an overpoisoned guaranteed shutdown state whenever it is shut down and not actively undergoing a restart. Due to the high gadolinium concentration, the ion chamber systems go off scale within three weeks. Operating policies and procedures require the neutron flux and its rate of change to be monitored when fuel is in the reactor. (author)

  6. Axial Permanent Magnet Generator for Wearable Energy Harvesting

    DEFF Research Database (Denmark)

    Högberg, Stig; Sødahl, Jakob Wagner; Mijatovic, Nenad

    2016-01-01

    An increasing demand for battery-free electronics is evident by the rapid increase of wearable devices, and the design of wearable energy harvesters follows accordingly. An axial permanent magnet generator was designed to harvest energy from human body motion and supplying it to a wearable...... in order to reduce the rotor inertia and to reduce losses. Analytical models and finite element simulations were employed for the analyses of both generator types, and verified experimentally by prototypes. The results suggested that a generator of this size and power rating (20 mm radius, and 5 m...

  7. A clip-on Zeeman slower using toroidal permanent magnets.

    Science.gov (United States)

    Krzyzewski, S P; Akin, T G; Dahal, Parshuram; Abraham, E R I

    2014-10-01

    We present the design of a zero-crossing Zeeman slower for (85)Rb using rings of flexible permanent magnets. The design is inexpensive, requires no power or cooling, and can be easily attached and removed for vacuum maintenance. We show theoretically that such a design can reproduce a magnetic field profile of a standard zero-crossing Zeeman slower. Experimental measurements of a prototype and comparisons to theoretical simulations demonstrate the feasibility of the design and point toward future improvements. Simulations show an atom flux similar to other Zeeman slowers.

  8. Quasi permanent superconducting magnet of very high field

    Science.gov (United States)

    Ren, Y.; Liu, J.; Weinstein, R.; Chen, I. G.; Parks, D.; Xu, J.; Obot, V.; Foster, C.

    1993-01-01

    We report on persistent field in a quasi-permanent magnet made of high temperature superconductor. The material has an average of 40 percent molar excess of Y, relative to Y1Ba2Cu3O7 and has been irradiated with high energy light ions at 200 MeV. The magnet, which traps 1.52 T at 77.3 K, traps nearly 4 T at 64.5 K. No evidence of giant flux jump or sample cracking was observed.

  9. Multipole shimming of permanent magnets using harmonic corrector rings.

    Science.gov (United States)

    Jachmann, R C; Trease, D R; Bouchard, L-S; Sakellariou, D; Martin, R W; Schlueter, R D; Budinger, T F; Pines, A

    2007-03-01

    Shimming systems are required to provide sufficient field homogeneity for high resolution nuclear magnetic resonance (NMR). In certain specialized applications, such as rotating-field NMR and mobile ex situ NMR, permanent magnet-based shimming systems can provide considerable advantages. We present a simple two-dimensional shimming method based on harmonic corrector rings which can provide arbitrary multipole order shimming corrections. Results demonstrate, for example, that quadrupolar order shimming improves the linewidth by up to an order of magnitude. An additional order of magnitude reduction is in principle achievable by utilizing this shimming method for z-gradient correction and higher order xy gradients.

  10. Permanent facial paralysis: surgical correction with Labbe’s technique

    OpenAIRE

    Yangali, Rubén; Servicio de Otorrinolaringología y Cirugía de Cabeza y Cuello. Hospital Central de la Fuerza Aérea del Perú. Lima, Perú.; Neme, Alex; Servicio de Urgencias. Hospital La Mancha Centro. Ciudad Real, España.; Moreno, Kattia; Research Assistant Otolaryngology and Head and Neck Surgery. University Of Cincinnati. Ohio, USA.; Cuadros, Jerson; Centro de Terapia Física y Rehabilitación (CETEFI). Arequipa, Perú

    2013-01-01

    Facial paralysis causes a large aesthetic and functional defect. Different surgical techniques may be used to repair this defect. Some of them have focused in structural and physiological aspects. We consider that temporalis lengthening myoplasty is currently the most important technique for permanent facial paralysis repair. La parálisis facial genera un gran déficit estético y funcional. Las diversas técnicas quirúrgicas han ido evolucionando, a fin de corregir este defecto de la forma m...

  11. Reliability of Structural Systems with regard to Permanent Displacements

    DEFF Research Database (Denmark)

    Sørensen, John Dalsgaard; Thoft-Christensen, Palle

    1991-01-01

    methods/experience related to permanent deformations are described in Grinda et al. [1] and Papadrakakis & Loukakis [2]. For general dynamic systems modelled by one-degree-of-freedom (and two-degrees-of freedom) systems a number of methods exist, see e.g. Nielsen et al. [3] and Toro & Cornell [4]. However...... approach - a differential equation approach - a superposition approach - the simple method These three approaches are described in Sørensen & Thoft-Christensen [5], Sørensen et al. [6] and Sørensen & Thoft-Christensen [7]. It is assumed that the structural system can be modelled by a multi-linear elastic...

  12. Treatment of Ectopic Mandibular Second Permanent Molar with Elastic Separators

    Directory of Open Access Journals (Sweden)

    R. Rajesh

    2014-01-01

    Full Text Available Ectopic eruption is a developmental disturbance in which the tooth fails to follow its normal eruption pathway. Ectopic eruption of the second molar is relatively rare. This paper presents the case of thirteen-year-old male with an ectopic mandibular second permanent molar. The condition was corrected with surgical exposure and placement of elastic separators. This case report lays emphasis on the practice of basic methods to obtain acceptable results rather than extensive surgical or orthodontic corrections. It is advised that ectopic teeth should not be neglected especially when it concerns developing caries and malocclusion.

  13. Riddles in the Dark: Imaging Inside Mercury's Permanently Shadowed Craters

    Science.gov (United States)

    Ernst, C. M.; Chabot, N. L.; Denevi, B. W.; Nair, H.; Deutsch, A. N.; Murchie, S. L.; Robinson, M. S.; Blewett, D. T.; Head, J. W.; Harmon, J. K.; Neumann, G. A.; Solomon, S. C.

    2013-12-01

    Numerous lines of evidence independently point to the presence of water ice in Mercury's polar regions: Earth-based radar shows radar-bright regions; Mariner 10 and MESSENGER Mercury Dual Imaging System (MDIS) images reveal that these regions are permanently (south polar region) or persistently (north polar region) shadowed; neutron spectrometry indicates hydrogen-rich material; thermal models support the presence of water ice; and Mercury Laser Altimeter (MLA) reflectance measurements at 1064 nm show high and low reflectance deposits consistent in location to where models predict surface and buried water ice, respectively. Throughout 2013, MESSENGER executed a campaign dedicated to imaging the permanently shadowed crater floors of Mercury's north polar region using sunlight scattered from nearby terrain. The campaign makes use of the broadband clear filter (central wavelength 700 nm, bandwidth 600 nm) of the MDIS wide-angle camera (WAC) to target and image radar-bright areas within all host craters > 10 km in diameter under multiple lighting conditions. To date, MESSENGER has imaged the interiors of nearly 20 craters that host radar-bright deposits, including the largest such deposits near the north pole that are likely to host surface water ice. The images reveal a variety of surface morphologies, ranging from the smooth crater floor of the fresh Kandinsky crater, to the moderately cratered floor of Tolkien crater, and to the battered floor of Prokofiev crater, in which the permanently shadowed region does not differ morphologically from the rest of the crater floor. Thus, no distinct morphology is identified in association with polar deposits, and craters hosting such material span the typical range of degradation states relative to their illuminated counterparts. MDIS images also reveal albedo differences in craters with floors not fully in permanent shadow. Prokofiev provides a special environment for viewing a radar- and MLA-bright region suspected to host

  14. Permanent GNSS Observations at Agh-Ust Satellite Observatory

    Science.gov (United States)

    Kudrys, Jacek

    2016-06-01

    GPS satellite observations at the Faculty of Mining Surveying and Environmental Engineering AGH-UST are conducted since the early 90s of the last century. In 2001, efforts have been made on getting permanently functioning GPS station. At present, observatory is EPN operational center for two GNSS stations KRAW and KRA1. Moreover, KRA1 station is one of fundamental control points in polish horizontal network. The article gives the history and scope of the research carried out in the satellite observatory AGH-UST during the period 2001 - 2015.

  15. The permanent electric dipole moment of chromium monoxide

    Science.gov (United States)

    Steimle, Timothy C.; Nachman, David F.; Shirley, Jeffrey E.; Bauschlicher, Charles W.; Langhoff, Stephen R.

    1989-01-01

    The permanent electric dipole moments for the X 5Pi and B 5pi states of gas-phase CrO have been experimentally determined using the sub-Doppler optical technique of intermodulated fluorescence spectroscopy in conjunction with the Stark effect. The measured values are 3.88 + or - 0.13 and 4.1 + or - 1.8 D for the X and B states, respectively. The theoretical values determined for the X state using multireference CI iterative-natural-orbital and finite-field calculations are in excellent agreement with the experimental value.

  16. Modeling Permanent Deformations of Superelastic and Shape Memory Materials.

    Science.gov (United States)

    Urbano, Marco Fabrizio; Auricchio, Ferdinando

    2015-06-11

    In this paper we propose a modification of the polycrystalline shape memory alloy constitutive model originally proposed by Souza. By introducing a transformation strain energy with two different hardening coefficients, we are able to take into account the effect of the martensitic transformation of unfavorably oriented grains occurring after the main plateau. By choosing a proper second hardening coefficient, it is possible to reproduce the correct stress strain behavior of the material after the plateau without the need of introducing a much smaller Young modulus for martensite. The proposed modification is introduced in the model comprising permanent deformation effects. Model results for uniaxial stress tests are compared to experimental results showing good agreement.

  17. Modelling of Permanent Magnet Synchronous Motor Incorporating Core-loss

    Directory of Open Access Journals (Sweden)

    K. Suthamno

    2012-08-01

    Full Text Available This study proposes a dq-axis modelling of a Permanent Magnet Synchronous Motor (PMSM with copper-loss and core-loss taken into account. The proposed models can be applied to PMSM control and drive with loss minimization in simultaneous consideration. The study presents simulation results of direct drive of a PMSM under no-load and loaded conditions using the proposed models with MATLAB codes. Comparisons of the results are made among those obtained from using PSIM and SIMULINK software packages. The comparison results indicate very good agreement.

  18. A strong permanent magnet-assisted electromagnetic undulator

    Science.gov (United States)

    Halbach, K.

    1987-01-30

    This invention discloses an improved undulator comprising a plurality of electromagnet poles located along opposite sides of a particle beam axis with alternate north and south poles on each side of the beam to cause the beam to wiggle or undulate as it travels generally along the beam axis and permanent magnets spaced adjacent the electromagnetic poles on each side of the axis of said particle beam in an orientation sufficient to reduce the saturation of the electromagnet poles whereby the field strength of the electromagnet poles can be increased beyond the normal saturation levels of the electromagnetic poles. 4 figs.

  19. Bonding durability of dental sealants to deciduous and permanent teeth

    OpenAIRE

    MOURA, Sandra Kiss; Lemos,Letícia Vargas Freire Martins; Myszkovisk, Suellen; Provenzano, Maria Gisette Arias; Balducci,Ivan; Myaki, Silvio Issao [UNESP

    2014-01-01

    AIM: To evaluate the bonding durability of materials used as sealants on different dentitions. METHODS: Deciduous (D) and permanent (P) molars were divided into four groups (n=5) and sealed with Fluroshield (F) and OptiBond FL (FL). Blocks of composite resin were built, stored in distilled water (24 h/37 °C), sectioned into 0.8 mm2 and tested at tensile (0.5 mm/min) after 24 h and 6 months. The fractures were observed and classified into adhesive, cohesive or mixed types. The data were a...

  20. Sensitive Search for a Permanent Muon Electric Dipole Moment

    CERN Document Server

    Semertzidis, Y K; Danby, G T; Jackson, J W; Larsen, R; Lazarus, D M; Meng, W; Morse, W M; Ozben, C; Prigl, R; Carey, R M; Miller, J P; Rind, O; Roberts, B L; Sulak, Lawrence R; Balakin, V; Bazhan, A; Dudnikov, A; Khazin, B I; Sylvestrov, G; Orlov, Yu F; Jungmann, Klaus; Debevec, P T; Hertzog, D W; Onderwater, Gerco; Stephenson, E J; Cushman, P B; Kronkvist, I J; Farley, Francis J M

    2000-01-01

    We are proposing a new method to carry out a dedicated search for a permanent electric dipole moment (EDM) of the muon with a sensitivity at a level of 10^{-24} e cm. The experimental design exploits the strong motional electric field sensed by relativistic particles in a magnetic storage ring. As a key feature, a novel technique has been invented in which the g-2 precession is compensated with radial electric field. This technique will benefit greatly when the intense muon sources advocated by the developers of the muon storage rings and the muon colliders become available.

  1. Mr. James B. Foley, Deputy Permanent Representative, Permanent Mission of the United States of America to the United Nations and other International Organisations in Geneva

    CERN Multimedia

    Patrice Loïez

    2001-01-01

    Mr. James B. Foley, Deputy Permanent Representative, Permanent Mission of the United States of America in Geneva (2nd from left) visiting the CMS assembly hall at Point 5 with (from left to right) Professor Roger Cashmore, Research Director for Collider Programmes, Dr Michel Della Negra, Spokesman for the CMS experiment, and Professor Luciano Maiani, CERN Director-General, September 2001

  2. Elastic Band Causing Exfoliation of the Upper Permanent Central Incisors

    Directory of Open Access Journals (Sweden)

    Monica Ghislaine Oliveira Alves

    2015-01-01

    Full Text Available Objective. This study reports a case in which elastic band use culminated in the loss of the incisors. Case Report. An 11-year-old white girl was seen complaining of pain, with purulent discharge and severe tooth mobility. The bone destruction detected radiographically in the region, despite its single location and absence in posterior quadrants of the maxilla and/or mandible, was similar to that observed in Langerhans cell disease. To our surprise, an elastic band involving the midportion of the roots of the two upper central incisors was found during biopsy. The debris was removed and a metal wire was placed in permanent maxillary right and left incisors. The patient was followed up, but no improvement in tooth mobility was observed. Bone loss increased, and internal resorption and root exposure occurred, which culminated in the extraction of permanent maxillary right and left incisors. Conclusion. The present case highlights the fact that professionals sometimes are confronted by anamnestic reports never seen before.

  3. Permanent gas analysis using gas chromatography with vacuum ultraviolet detection.

    Science.gov (United States)

    Bai, Ling; Smuts, Jonathan; Walsh, Phillip; Fan, Hui; Hildenbrand, Zacariah; Wong, Derek; Wetz, David; Schug, Kevin A

    2015-04-03

    The analysis of complex mixtures of permanent gases consisting of low molecular weight hydrocarbons, inert gases, and toxic species plays an increasingly important role in today's economy. A new gas chromatography detector based on vacuum ultraviolet (VUV) spectroscopy (GC-VUV), which simultaneously collects full scan (115-240 nm) VUV and UV absorption of eluting analytes, was applied to analyze mixtures of permanent gases. Sample mixtures ranged from off-gassing of decomposing Li-ion and Li-metal batteries to natural gas samples and water samples taken from private wells in close proximity to unconventional natural gas extraction. Gas chromatography separations were performed with a porous layer open tubular column. Components such as C1-C5 linear and branched hydrocarbons, water, oxygen, and nitrogen were separated and detected in natural gas and the headspace of natural gas-contaminated water samples. Of interest for the transport of lithium batteries were the detection of flammable and toxic gases, such as methane, ethylene, chloromethane, dimethyl ether, 1,3-butadiene, CS2, and methylproprionate, among others. Featured is the capability for deconvolution of co-eluting signals from different analytes.

  4. Quality of Life Following Permanent Neurological Damage after Subarachnoid Block

    Directory of Open Access Journals (Sweden)

    Yvonne Dabota Buowari

    2011-01-01

    Full Text Available Introduction. Caesarean section is the commonest operation carried out in females of the reproductive age group. Spinal anaesthesia is commonly used for caesarean section with its risk. Permanent paralysis of the lower limbs following subarachnoid block is a rare complication but can occur even in the best of hands. Case Summary. This is a 29-year-old final-year university student now 34 years old who had emergency caesarean section for cephalopelvic disproportion in 2005 under spinal anaesthesia in a low-resource setting in a developing country. She developed permanent neurological deficit thereafter. She had urinary and faecal incontinence for one year. She lost one academic session at her school because of long hospital stay and is now confined to a wheel chair. She celebrated her daughter's fifth birthday in October, 2010. Although there is ability in inability, she is now disabled. Conclusion. It is important for clinicians to recognise the complications of subarachnoid block promptly to avoid delay in treatment and severe neurological deficits.

  5. Two dimensional model of a permanent magnet spur gear

    DEFF Research Database (Denmark)

    Jørgensen, Frank Thorleif; Andersen, Torben Ole; Rasmussen, Peter Omand

    2005-01-01

    This paper presents calculation and measurement results of a high-performance permanent-magnetic gear. The analyzed permanent-magnetic gear has a gear ratio of 5.5 and is able to deliver 27 N/spl middot/m. The analysis has shown that special attention needs to be paid to the system where the gear...... is to be installed because of a low natural torsion spring constant. The analyzed gear was also constructed in practice in order to validate the analysis and predict the efficiency. The measured torque from the magnetic gear was only 16 N/spl middot/m reduced by the large end-effects. A systematic analysis...... of the loss components in the magnetic gear is also performed in order to figure out why the efficiency for the actual construction was only 81%. A large magnetic loss component originated in the bearings, where an unplanned extra bearing was necessary due to mechanical problems. Without the losses...

  6. Highlights of the inauguration ceremony for the new permanent exhibition

    CERN Multimedia

    CERN Bulletin

    2010-01-01

    The new “Universe of Particles" permanent exhibition in the Globe was unveiled this week to its first visitors. On Monday, 28 June, in the presence of representatives of the local authorities, CERN Director-General Rolf Heuer cut the ribbon; on Tuesday, 29 and Wednesday 30 June the Globe's doors remained open for visits by the CERN personnel.   Cutting the ribbon at the inauguration of the Globe's new permanent exhibition At the conclusion of the inauguration ceremony, the Head of the Education Group, Rolf Landua, expressed his satisfaction: “It's wonderful. We are very happy that it has all turned out so well. Now we look forward to lots of visitors.” The exhibition represents a major addition to the tourist destinations in the region and an important tool for the public awareness of science, which could also be useful for schools. “The purpose of the exhibition is to inspire visitors, to arouse their curiosity about science and to motivate them t...

  7. Practical Aspects of Modern and Future Permanent Magnets

    Science.gov (United States)

    McCallum, R. W.; Lewis, L.; Skomski, R.; Kramer, M. J.; Anderson, I. E.

    2014-07-01

    The mandate to reduce greenhouse gases will require highly efficient electric machines for both power generation and traction motor applications. Although permanent magnet electric machines utilizing Nd2Fe14B-based magnets provide obvious power-to-weight advantages over induction machines, the limited availability and high price of the rare earth (RE) metals make these machines less favorable. Of particular concern is the cost and supply criticality of Dy, a key RE element that is required to improve the high-temperature performance of Nd-based magnetic alloys for use in generators and traction motors. Alternatives to RE-based alloys do exist, but they currently lack the energy density necessary to replace Nd-based magnets. Many of these compounds have been known for decades, but serious interest in their development waned once compounds based on RE elements were discovered. In this review, intrinsic and extrinsic materials factors that impact the optimization of both existing and potential future permanent magnets for energy applications are examined in light of new insights gained from renewed examination.

  8. Anatomic considerations for abdominally placed permanent left ventricular assist devices.

    Science.gov (United States)

    Parnis, S M; McGee, M G; Igo, S R; Dasse, K; Frazier, O H

    1989-01-01

    To determine anatomic parameters for a permanent, electrically actuated left ventricular assist device (LVAD), the effects of abdominal placement of pneumatic LVADs used as temporary support for patients awaiting heart transplantation was studied. Understanding the anatomic constraints imposed by the abdominal viscera in LVAD placement is crucial, because improper placement can result in compression or obstruction of adjacent structures. Anatomic compatibility was assessed in four men (age 22-48 years) who were supported by the LVAD for over 1 month (range 35-132 days). The pump was intraperitoneally placed in the left upper quadrant. Radiographic techniques were employed, including CT scanning (with patients supine) and contrast imaging (patients in anatomical position), and the pump and conduits appeared to be properly positioned, with minimal compression of the body of the stomach, and no obstruction of adjacent organs. Three patients returned to a solid food diet and exercised daily by stationary cycling and walking. No signs of migration or erosion of the pump were present at the time of LVAD removal and cardiac transplantation. Successful clinical experience with short-term use of the LVAD suggests that the electrically actuated device can be well tolerated in patients requiring permanent left ventricular assistance.

  9. Epidural fibrosis after permanent catheter insertion and infusion.

    Science.gov (United States)

    Aldrete, J A

    1995-11-01

    Forty-six permanent epidural catheters and life-port units were implanted in 43 patients with severe, recurrent low back pain who had been considered not to be candidates for surgical intervention and in whom other therapeutic modalities had failed. Eight cases developed epidural fibrosis (EF). For analgesia, patients received either infusions with preservative-free solutions of fentanyl and bupivacaine or daily boluses of morphine and bupivacaine. Catheters remained from 75 days to 433 days. Signs of EF appeared from 21 days to 320 days after implantation. Pain at injection or resistance to injection were initial manifestations of EF, followed by poor, and eventually, nil analgesic effect. The epidural catheters were made of either polyamide, silicone, or polyurethane. Epidurograms revealed encapsulation, narrowing, and loculation of epidural space with gradually reduced spread of the contrast material. The occurrence of EF limits the permanency of implanted epidural catheters. The infusate does not cause this complication, which appears to be a foreign body reaction due to the presence of the catheter in the epidural space.

  10. Is Malnutrition Associated with Crowding in Permanent Dentition?

    Directory of Open Access Journals (Sweden)

    Erika B. A. F. Thomaz

    2010-09-01

    Full Text Available Evidence suggests that energy-protein malnutrition is associated with impaired growth and development of facial bones. The objective of this study was to investigate the association between nutritional status and reduced space for dental eruption (crowding in permanent dentition. A cross-sectional study with probabilistic sampling design was used. We evaluated 2,060 students aged 12 to 15 years enrolled in schools in the northeast of Brazil. Crowding was defined according to World Health Organization (WHO as misalignment of teeth due to lack of space for them to erupt in the correct position. Nutritional status was evaluated by means of body mass index and height-for-age, using the WHO’s reference curves. Parents and adolescents responded to a questionnaire about demographic, socioeconomic, biological and behavioral characteristics. The associations were estimated by odds ratio (OR in multivariate logistic regression analysis (alpha = 0.05. Confounding and effect-modification were taken into account. An association between low height-for-age (z-score < –1SD and crowding was only observed in adolescents with a prolonged history of mouth breathing (OR = 3.1. No association was observed between underweight and crowding. Malnutrition is related to crowding in permanent dentition among mouth-breathing adolescents. Policy actions aimed at reducing low height-for-age and unhealthy oral habits are strongly recommended. However, further studies are needed to increase the consistency of these findings and improve understanding of the subject.

  11. Greenhouse gases as clues to permanence of farmlands.

    Science.gov (United States)

    Janzen, H Henry

    2007-06-01

    Farmlands are expansive, diverse, and intensively managed ecosystems. These lands, so critical to human welfare, are threatened by growing stresses as demand for food escalates, fresh water wanes, cheap fuels deplete, and other uses jostle for space. With these coming pressures, how can we foster permanence on the lands that sustain us? In this essay I contemplate the hypothesis that the greenhouse gases, because they emanate from the interwoven flows of C, N, and energy in ecosystems, can help steer us toward permanence (sustainability). Alongside other indicators these emissions may detect the ecosystem's pulse, alerting us to inefficiencies and guiding us to better practices. To be effective signals, however, the greenhouse gases will need to be considered in their local settings, monitored longer and in more "listening places," and measured across boundaries of disciplines and biomes. This approach may help reduce greenhouse gas emissions from our farmlands. But we may find that, in the long run, the main beneficiaries of our inquiry have been, not just the atmosphere, but our fragile lands, perhaps in ways we cannot yet foresee.

  12. Hanford Permanent Isolation Barrier Program: Asphalt technology development

    Energy Technology Data Exchange (ETDEWEB)

    Freeman, H.D.; Romine, R.A.

    1994-11-01

    An important component of the Hanford Permanent Isolation Barrier is the use of a two-layer composite asphalt system, which provides backup water diversion capabilities if the primary capillary barrier fails to meet infiltration goals. Because of asphalt`s potential to perform to specification over the 1000-year design life criterion, a composite asphalt barrier (HMAC/fluid-applied polymer-modified asphalt) is being considered as an alternative to the bentonite clay/high density poly(ethylene) barriers for the low-permeability component of the Hanford Permanent Isolation Barrier. The feasibility of using asphalt as a long-term barrier is currently being studied. Information that must be known is the ability of asphalt to retain desirable physical properties over a period of 1000 years. This paper presents the approach for performing accelerated aging tests and evaluating the performance of samples under accelerated conditions. The results of these tests will be compared with asphalt artifact analogs and the results of modeling the degradation of the selected asphalt composite to make life-cycle predictions.

  13. Decoronation for the management of an ankylosed young permanent tooth.

    Science.gov (United States)

    Sapir, Shabtai; Shapira, Joseph

    2008-02-01

    Replacement resorption rate is a variable process, and is dependent on age, basal metabolic rate, extra-alveolar time, treatment prior to replantation, amount of root dentin, severity of trauma, and extent of periodontal ligament necrosis. In patients 7-16 years old a tooth is lost 3-7 years after the onset of root resorption. The complications that may develop as a consequence of ankylosis of a permanent incisor in children are due to the inevitable early loss of the traumatized tooth and local arrest of alveolar bone development. An ankylosed tooth should be removed before the changes become so pronounced that they compromise future prosthetic treatment. The treatment options may involve: interceptive regenerative treatment, early extraction of the ankylosed tooth, orthodontic space closure, intentional replantation, extraction of the ankylosed tooth followed with immediate ridge augmentation/preservation, auto-transplantation, single tooth dento-osseous osteotomy, and decoronation. The purpose of this article was to review the considerations involved in the decision-making concerning the use of the decoronation technique for the treatment of a permanent incisor diagnosed as ankylosed.

  14. Replantation of permanent incisors in children using Emdogain.

    Science.gov (United States)

    Barrett, Edward J; Kenny, David J; Tenenbaum, Howard C; Sigal, Michael J; Johnston, Douglas H

    2005-10-01

    The aim of this study was to determine whether application of an enamel matrix protein derivative, Emdogain (Biora AB Malmo, Sweden) to the root surface of avulsed permanent incisors would improve postreplantation outcomes in a pediatric population. Between June 1999 and May 2002, 25 avulsed permanent maxillary incisors (22 centrals and three laterals) were treated with Emdogain and followed for up to 32 months, mean duration 20.6 months (range: 6.9-32.5 months). Mean patient age at the time of treatment was 12.0 years (range: 7.7-17.6 years) and mean extra-alveolar duration was 185 min (range: 100-300 min). At the end of their follow-up each of the replanted incisors demonstrated radiographic evidence of replacement root resorption and clinical evidence of ankylosis. None of the replanted teeth were affected by inflammatory root resorption and there was no evidence of infection. When compared with the control samples from Barrett and Kenny (Endod Dent Traumatol 1997;15:269-72.) and Andersson et al. (Endod Dent Traumatol 1989;5:38-47.) this sample treated with the Emdogain protocol demonstrated significantly less root resorption than either of the control samples (anova, P Emdogain protocol did not produce periodontal regeneration, it did eliminate inflammatory resorption and infection and led to significantly less root resorption compared with the two historical controls.

  15. Permanent administration of d-fenfluramine in rats: paradoxical effects.

    Science.gov (United States)

    Rozen, R; Fumeron, F; Betoulle, D; Baigts, F; Mandenoff, A; Fricker, J; Apfelbaum, M

    1988-01-01

    In order to test the hypothesis of Levitzky that d-fenfluramine (d-F) acts by modifying the ponderal set-point, we compared the effects of a permanent infusion of d-F on food intake and body weight (BW). The effect on the weight persisted as long as the infusion; the clear-cut anorectic effect lasted only a few days. This paradox is compatible with the set-point hypothesis. In rats rendered overweight by insulin treatment, the d-F-induced decrease in BW was approximately four times smaller than in controls. In rats rendered overweight by a cafeteria diet, the decrease in BW was twice as large in permanently cafeteria fed rats as in cafeteria, then, ad lib fed rats. In rats rendered underweight by a restricted chow diet and then returned to an ad lib feeding, the final BW depended only on the doses of d-F (0.6 or 12 mg/kg BW/day), whatever the weight at the beginning of infusion. Thus, the underweight paradigm fits well with the set-point hypothesis; the overweight paradigm fits only partially.

  16. Follow-up of permanent hearing impairment in childhood.

    Science.gov (United States)

    Della Volpe, A; De Lucia, A; Pastore, V; Bracci Laudiero, L; Buonissimo, I; Ricci, G

    2016-02-01

    Programmes for early childhood childhood hearing impairment identification allows to quickly start the appropriate hearing aid fitting and rehabilitation process; nevertheless, a large number of patients do not join the treatment program. The goal of this article is to present the results of a strategic review of the strengths, weaknesses, opportunities and threats connected with the audiologic/prosthetic/language follow-up process of children with bilateral permanent hearing impairment. Involving small children, the follow-up includes the involvement of specialised professionals of a multidisciplinary team and a complex and prolonged multi-faced management. Within the framework of the Italian Ministry of Health project CCM 2013 "Preventing Communication Disorders: a Regional Program for Early Identification, Intervention and Care of Hearing Impaired Children", the purpose of this analysis was to propose recommendations that can harmonise criteria for outcome evaluation and provide guidance on the most appropriate assessment methods to be used in the follow-up course of children with permanent hearing impairment. © Copyright by Società Italiana di Otorinolaringologia e Chirurgia Cervico-Facciale.

  17. Permanent muscle weakness in McArdle disease.

    Science.gov (United States)

    Nadaj-Pakleza, Aleksandra A; Vincitorio, Carlo M; Laforêt, Pascal; Eymard, Bruno; Dion, Elisabeth; Teijeira, Susana; Vietez, Irene; Jeanpierre, Marc; Navarro, Carmen; Stojkovic, Tanya

    2009-09-01

    McArdle disease is an autosomal recessive muscle glycogenosis. In the typical clinical presentation, only exercise-related symptoms are noted. Nevertheless, permanent weakness may occur, usually late in life. In this study we report on the clinical and genetic features of fixed muscle weakness in McArdle disease. Among the 80 McArdle patients being followed at the Institute of Myology of the Salpêtrière Hospital, 9 patients have permanent weakness. The diagnosis of McArdle disease was confirmed by muscle biopsy and genetic investigations. Two patterns of muscle weakness and wasting were noted: (1) proximal and symmetric in 5 patients; and (2) asymmetric, mimicking facioscapulohumeral dystrophy (FSHD) in 4 patients. Computerized tomography scan showed fatty infiltration in the shoulder and pelvic girdle muscles. There was no clear correlation between genotype and the severity of muscle weakness. Proximal muscle weakness appeared after the age of 40 years and affected 11% of subjects in our series of 80 McArdle patients. Among patients over 40 years of age, 37.5% had muscle weakness.

  18. Sexual dimorphism in permanent teeth of modern Greeks.

    Science.gov (United States)

    Zorba, Eleni; Moraitis, Konstantinos; Manolis, Sotiris K

    2011-07-15

    Sex determination is considered an important step in reconstructing the biological profile of unknown individuals from a forensic context. Forensic anthropologists have long used teeth as an additional tool for sex determination as they resist postmortem destruction. In this case the use of population-specific data is necessary since sexual dimorphism varies between different populations. Currently there are no odontometric standards for determining sex in Greek populations. The purpose of this study is to examine the degree of sexual dimorphism in permanent teeth of modern Greeks. A total of 839 permanent teeth in 133 individuals (70 males and 63 females) from the Athens Collection were examined. Mesiodistal and buccolingual crown and cervical diameters of both maxillary and mandibular teeth were measured. It was found that males have bigger teeth than females and in 65 out of 88 dimensions measured, male teeth exceeded female teeth significantly (P<0.05). Canines were the most dimorphic teeth followed by first premolars, maxillary second premolar and mandibular second molar. Although other teeth were also sexually dimorphic they did not have a statistically significant difference in all dimensions. The most dimorphic dimension was buccolingual cervical diameter followed by buccolingual crown diameter. A comparison of sexual dimorphism in teeth between different populations showed that it differs among different groups. European population groups presented the highest degree of sexual dimorphism in teeth whereas Native South Americans the lowest.

  19. A basis of settlement: Economic foundations of permanent pioneer communities

    Science.gov (United States)

    Jones, Eric M.

    1992-01-01

    High transport costs will dominate the course of lunar development. During the earliest phases, when lunar facilities consist of a research and resource development complex with staff serving tours of a few months, transport costs will encourage local production of fuel, food, and building materials. Once these capabilities are in place and the number of personnel grows to a few hundred, staff rotation might well dominate transport budgets. At that point it would make economic sense to encourage some members of staff to become permanent residents. By analogy with early British settlement in Australia, a vigorous private sector economy could emerge if the lunar organization provided quasi-export earnings through its role as the community's major employer and as the major buyer of locally produced goods. By providing such a market for goods and services, the lunar organization would not only provide a means whereby permanent residents could support themselves, but could also accelerate the process of replacing imported goods with local manufacturers, thereby reducing the cost of operations. By analogy with recent Alaskan experience, if the resource development activity started making money from sales to orbital customers, export taxes and/or royalty payments could also provide means by which a lunar community could support itself.

  20. Toroidal-Core Microinductors Biased by Permanent Magnets

    Science.gov (United States)

    Lieneweg, Udo; Blaes, Brent

    2003-01-01

    The designs of microscopic toroidal-core inductors in integrated circuits of DC-to-DC voltage converters would be modified, according to a proposal, by filling the gaps in the cores with permanent magnets that would apply bias fluxes (see figure). The magnitudes and polarities of the bias fluxes would be tailored to counteract the DC fluxes generated by the DC components of the currents in the inductor windings, such that it would be possible to either reduce the sizes of the cores or increase the AC components of the currents in the cores without incurring adverse effects. Reducing the sizes of the cores could save significant amounts of space on integrated circuits because relative to other integrated-circuit components, microinductors occupy large areas - of the order of a square millimeter each. An important consideration in the design of such an inductor is preventing magnetic saturation of the core at current levels up to the maximum anticipated operating current. The requirement to prevent saturation, as well as other requirements and constraints upon the design of the core are expressed by several equations based on the traditional magnetic-circuit approximation. The equations involve the core and gap dimensions and the magnetic-property parameters of the core and magnet materials. The equations show that, other things remaining equal, as the maximum current is increased, one must increase the size of the core to prevent the flux density from rising to the saturation level. By using a permanent bias flux to oppose the flux generated by the DC component of the current, one would reduce the net DC component of flux in the core, making it possible to reduce the core size needed to prevent the total flux density (sum of DC and AC components) from rising to the saturation level. Alternatively, one could take advantage of the reduction of the net DC component of flux by increasing the allowable AC component of flux and the corresponding AC component of current