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Sample records for cement-bentonite cut-off walls

  1. Investigation of the performance of cement-bentonite cut-off walls in aggressive ground at a disused gasworks site

    International Nuclear Information System (INIS)

    There has been an increased use of cement-bentonite slurry trench cut-off walls to control the lateral migration of pollution in the UK. Concerns inevitably exist about their performance in chemically aggressive ground particularly in the long term. To address some of the uncertainties a programme of field and laboratory research is being undertaken at a disused gasworks in the UK. Elevated levels of sulphate and other contaminants are present on the site and could potentially change the properties of the cement-bentonite. Two boxes, 10m square in plan, by 5m deep have been constructed, one with and one without an HDPE membrane, to isolate parts of the site. Local hydraulic gradients across the walls have been created by pumping from within the boxes. Isolated lengths of wall have been constructed which are being used to assess and develop in-situ testing techniques such as the piezocone for measuring permeability, strength and overall integrity of the wall

  2. Design and construction of a seepage cut off wall using the slurry trench technique in cold temperatures at the Horizon Dam project

    Energy Technology Data Exchange (ETDEWEB)

    Barr, L.A.; Sobkowicz, J.C. [Thurber Engineering Ltd., Calgary, AB (Canada)

    2010-07-01

    This paper described the design and construction of a soil-cement-bentonite seepage cut off water that was constructed in 2007 as part of the Horizon Dam project at Canadian Natural Resources Ltd. Horizon oil sands site. The Horizon Dam is an earth retention structure which diverts the Tar River around the mine and plant site, and creates a man-made lake providing replacement fish habitat. It was necessary to build the cut off wall to control seepage through the native coarse grained alluvial deposits encountered under the dam and to minimize the risk of piping due to large hydraulic gradients created by the lake. This paper discussed the design of the dam and the field investigation using different geotechnical drilling methods, geophysics and in-situ testing to support design of the cut off wall. Specifically, the paper discussed a literature review and laboratory testing program that were carried out to assess the appropriate backfill mix to be used. The construction of the cut off wall took place at the end of winter using the slurry trench technique. As such, some unique constructability issues were encountered because of cold weather, the use of cement in the backfill, and the native soil conditions. It was concluded that although strict quality control/assurance measures were implemented, one defect in the cut off wall occurred, which required mitigation to provide a product that met the design intentions. 5 refs., 1 tab., 15 figs.

  3. Cut-off wall construction at the Peribonka hydroelectric project

    Energy Technology Data Exchange (ETDEWEB)

    Ouellette, C.; Morency, J.Y.; Bigras, A.; Hammamji, Y. [Hydro-Quebec Equipment, Montreal, PQ (Canada); Gagne, B. [SNC-Lavalin, Montreal, PQ (Canada); Rattue, A. [SNC-Lavalin, Montreal, PQ (Canada). Energy Division

    2007-07-01

    The Peribonka hydroelectric development, located in Quebec includes a 80 metre high dam and two dikes consisting of zoned earth and rock fills with a till core, an underground power house, a diversion tunnel and a spillway. The project is in its final stages of construction and presented several challenges related to the presence of a deep canyon under the river bed filled with alluvial sand, gravel, cobbles and boulders. The design included an approximately 10 metre high working platform in the river and the construction of a plastic concrete cut-off wall down to bedrock. The construction of a 116 metre deep single cut-off wall that is at the limit of precedent in terms of present knowledge and equipment capacity was the main challenge for the project. In addition, a 52 metre deep plastic concrete cut-off wall was built under a dyke. This conference discussed the cut-off wall construction experience, as well as the challenges encountered and how they were addressed. The paper presented a description of the site conditions and the scope of the work, as well as the typical specifications of the cut-offs. The paper also provided an overview of an extensive quality control program that was implemented for all phases of the project construction and results of the project. Last, the paper described the challenges, problems encountered and the modifications from the initial design and specifications. It was concluded that the topography at the Peribonka dam site showed a deep narrow gully filled with alluvial material comprising sand, gravel, cobbles and boulders. Elaborate quality control was essential to ensure that excavation and concreting were done to satisfactory standards. 4 refs., 4 tabs., 11 figs.

  4. European quality assurance and quality control for cut-off walls and caps

    International Nuclear Information System (INIS)

    Cut-off walls and caps both may be seriously compromised by small areas of substandard materials or work. Quality assurance/quality control is therefore of crucial importance and the paper sets out the issues that need to be addressed when designing a quality plan for a containment. Consideration is given to the purpose of the containment, the parameters to be controlled, specifications and standards and tests on raw and manufactured materials and on the in-situ containment. It is not the purpose of the paper to give detailed test procedures but rather to identify the questions that must be answered to develop a quality plan

  5. Design and construction of a soil bentonite cut-off wall for Suncor's South Tailings Pond

    Energy Technology Data Exchange (ETDEWEB)

    Stephens, B. [Klohn Crippen Berger Ltd., Calgary, AB (Canada); Bowron, M. [Suncor Energy Inc., Fort McMurray, AB (Canada)

    2010-07-01

    Commissioned in July 2006, Suncor's South Tailings Pond (STP) is an external oil sands tailings storage facility with a footprint of 2300 hectares including infrastructure. The Southwest cut-off wall was completed in 2008, forming one of four principal seepage management systems for the STP. The cut-off wall consists of soil bentonite backfill from native materials from the wall excavation. Construction of the wall utilized both a long-stick back-hoe and crane mounted clamshell to excavate the wall under bentonite slurry. This paper discussed the construction of the cut-off wall as well as the the field and laboratory testing programs that determined the soil-bentonite mix. It also described the quality assurance and quality control programs conducted during construction. Last, the paper provided a brief discussion of the design and construction issues specific to seepage cut-off walls in the oil sands region. It was concluded that while construction of a soil-bentonite wall is a simple process, a professional experienced in the construction of deep walls is essential to achieve a quality product. Technical site support is also needed by the construction team in order to confirm geology, material properties and design assumptions. 1 tab., 5 figs.

  6. Relation between wall motion and scintigraphic uptake altered by the cut-off level on technetium-99m sestamibi tomographic imaging. The preferable cut-off levels according to tomographic uptake correlated with the wall motion

    International Nuclear Information System (INIS)

    Whether technetium-99m sestamibi imaging can evaluate myocardial viability is still obscure. It may be partially because the preferable cut-off level for evaluation of the viability is not known. This study was aimed to investigate which cut-off level should be used for estimation of the contractile function, and verify whether technetium-99m sestamibi tomographic imaging can evaluate myocardial viability. We studied 45 patients who had myocardial infarction. They underwent technetium-99m sestamibi imaging, echocardiography, and cardiac catheterization. The myocardial image was divided into 16 segments, each of which was scored according to wall motion on echocardiography with a 4-point scale. The segmental technetium-99m uptake was also scored with a 4-point scale. We investigated the correlation between wall motion and scintigraphic uptake with the use of 7 cut off levels (from 35% to 65%, in 5% increments). The correlation ranks were compared among patient groups with a number of stenotic vessels. Irrespective of the number of stenotic vessels, the defect score was similarly enlarged according to cut-off levels. The patient groups had the maximum correlation ranks with different cut-off levels, which were 40% for 1-vessel disease (ρ=0.512, n=160, p=0.0001), 50% for 2-vessel disease (ρ=0.424, n=208, p=0.0001), and 60% for 3-vessel disease (ρ=0.540, n=272, p=0.0001). The correlation ranks for all groups were stable, whereas not high, throughout various cut-off levels. Technetium-99m sestamibi imaging can approximately estimate myocardial viability from the point of view of function, which may be corrected by the careful choice of cut off levels according to the number of the stenotic vessels (40% for 1-vessel disease, 50% for 2-vessel disease, 60% for 3-vessel disease). (author)

  7. FACTORS AFFECTING THE HYDRAULIC BARRIER PERFORMANCE OF SOIL-BENTONITE MIXTURE CUT-OFF WALL

    Science.gov (United States)

    Takai, Atsushi; Inui, Toru; Katsumi, Takeshi; Kamon, Masashi; Araki, Susumu

    Containment technique using cut-off walls is a valid method against contaminants in subsurface soil and/or groundwater. This paper states laboratory testing results on hydraulic barrier performance of Soil-Bentonite (SB), which is made by mixing bentonite with in-situ soil. Since the bentonite swelling is sensitive to chemicals, chemical compatibility is important for the hydraulic barrier performance of SB. Hydraulic conductivity tests using flexible-wall permeameter were conducted on SB specimens with various types and concentrations of chemicals in the pore water and/or in the permeant and with various bentonite powder contents. As a result, hydraulic barrier performance of SB was influenced by the chemical concentration in the pore water of original soil and bentonite powder content. In the case that SB specimens have damage parallel to the permeating direction, no significant leakage in the SB occurs by the self-sealing property of SB. In addition, the hydraulic conductivity values of SB have excellent correlation with their plastic indexes and swelling pr essures, thus these properties of SB have some possibility to be indicators for estimation of the hydraulic barrier performance of SB.

  8. Potential interface slip analysis of Peribonka Dam plastic concrete cut-off wall

    Energy Technology Data Exchange (ETDEWEB)

    Morency, J.Y.; Chahde, J.; Bigras, A. [Hydro-Quebec, Montreal, PQ (Canada); Garand, P.; Rattue, A. [SNC-Lavalin Inc., Montreal, PQ (Canada)

    2006-07-01

    The Peribonka hydroelectric development is currently under construction near the confluence of the Manouane River with the Peribonka River in Quebec. It includes an 80 m high dam and two dykes of zoned earth fills with a till core, an underground power house with an installed capacity of 385 MW, a diversion tunnel and a spillway. The Peribonka dam will be built on a highly permeable alluvial foundation. The design includes a 10 m high working platform in the river between the cofferdams and a plastic concrete cut-off wall (COW) down to bedrock. The maximum depth of the COW in a narrow canyon will be 115 m. A bi-dimensional finite element stress and deformation analysis software (SDAS) was used to model the stress-strain behaviour of the foundation soils and the COW under the dam. The SDAS software made it possible to determine the vertical deformations as well as the horizontal stress distribution in the foundation soils. It was shown that due to the oedometric nature of the loading of the soil, no significant shear stress was generated due to the soil deformations in the foundation below the axis of the dam. However, the finite element program did not allow hyperbolic model slip elements. As such, it was not possible to evaluate if negative skin friction occurred at the soilplastic concrete interface. For that reason, a one-dimensional model allowing the simulation of negative or positive friction between the soil and the COW was developed. This model considered the elastic-plastic behaviour of the COW using a hyperbolic model. It showed that nowhere, except in the upper 2 to 3 m of the COW embedment in the core, was negative friction able to mobilize the full value of the internal friction angle of the soil. 4 refs., 1 tab., 9 figs.

  9. Application of High-Density Seismic Image in Nondestructive Exploration of Cut-off Cement-Soil Wall in Earth Dam

    Institute of Scientific and Technical Information of China (English)

    CAI Jing; WANG Jianhua; ZHANG Xianmin

    2005-01-01

    In order to quickly explore the quality of cut-off wall in dams, a new method of high-density seismic image was adopted and estimated by model and in-situ wall tests.The vibration exciter was employed and several parameters such as hypocentral distance, length of signal record and sampling space in signal collection were determined, which are 8 m, 0.25 ms and 128 ms respectively. Through time and frequency field signal analyses, it is concluded that, the smaller arrival times of reflected longitudinal and surface waves, and the higher their main frequencies, the higher the strength of the wall, vice versa. Accordingly the construction quality of the wall can be evaluated quickly by high-density seismic image.

  10. Automatic velocity control in cutting-off machines

    OpenAIRE

    Machado, Carlos; Fonseca, Jaime C.; Mendes, José A.

    2003-01-01

    Usually, automatic cutting-off machines, of metallic pipes or bars, use constant cutting velocity. This mode of operation, constant cutting velocity combined with different profiles of materials to be cut, causes variable cutting forces to be applied to the saw. As a result, the cutting off machine is generally set for the worst expected conditions, otherwise excessive wear of the saw and machine will occur. Further, traditional cutting-off machines require adjustments to be made in order to ...

  11. Intelligent cutting-off of pipes and bars

    OpenAIRE

    Machado, Carlos; Mendes, José A.; Fonseca, Jaime C.

    2003-01-01

    Traditionally, automatic cutting-off machines, of metallic pipes or bars, use a constant cutting velocity mode. This mode of operation, constant cutting velocity combined with different profiles of materials to be cut, exposes the cutting saw to variable cutting forces. Therefore, the cutting off machine is usually set for the worst expected conditions, otherwise excessive wear of the saw and machine will occur. Further, traditional cutting-off machines require the adjust...

  12. Experimental characterization of cement-bentonite interaction using core infiltration techniques and 4D computed tomography

    Science.gov (United States)

    Dolder, F.; Mäder, U.; Jenni, A.; Schwendener, N.

    Deep geological storage of radioactive waste foresees cementitious materials as reinforcement of tunnels and as backfill. Bentonite is proposed to enclose spent fuel drums, and as drift seals. The emplacement of cementitious material next to clay material generates an enormous chemical gradient in pore water composition that drives diffusive solute transport. Laboratory studies and reactive transport modeling predict significant mineral alteration at and near interfaces, mainly resulting in a decrease of porosity in bentonite. The goal of this project is to characterize and quantify the cement/bentonite skin effects spatially and temporally in laboratory experiments. A newly developed mobile X-ray transparent core infiltration device was used, which allows performing X-ray computed tomography (CT) periodically without interrupting a running experiment. A pre-saturated cylindrical MX-80 bentonite sample (1920 kg/m3 average wet density) is subjected to a confining pressure as a constant total pressure boundary condition. The infiltration of a hyperalkaline (pH 13.4), artificial OPC (ordinary Portland cement) pore water into the bentonite plug alters the mineral assemblage over time as an advancing reaction front. The related changes in X-ray attenuation values are related to changes in phase densities, porosity and local bulk density and are tracked over time periodically by non-destructive CT scans. Mineral precipitation is observed in the inflow filter. Mineral alteration in the first millimeters of the bentonite sample is clearly detected and the reaction front is presently progressing with an average linear velocity that is 8 times slower than that for anions. The reaction zone is characterized by a higher X-ray attenuation compared to the signal of the pre-existing mineralogy. Chemical analysis of the outflow fluid showed initially elevated anion and cation concentrations compared to the infiltration fluid due to anion exclusion effects related to compaction of

  13. Designing the sound of a cut-off drum

    CERN Document Server

    Martinetti, Pierre

    2015-01-01

    The spectral action in noncommutative geometry naturally implements an ultraviolet cut-off, by counting the eigenvalues of a (generalized) Dirac operator lower than an energy of unification. Inverting the well known question "how to hear the shape of a drum ?", we ask what drum can be designed by hearing the truncated music of the spectral action ? This makes sense because the same Dirac operator also determines the metric, via Connes distance. The latter thus offers an original way to implement the high-momentum cut-off of the spectral action as a short distance cut-off on space. This is a non-technical presentation of the results of http://arxiv.org/abs/1305.2605

  14. On cosmic-ray cut-off terminology

    International Nuclear Information System (INIS)

    The study of cosmic-ray access to location within the geomagnetic field has evolved over the past fifty years. Cosmic-ray cut-off terminology, originally developed to describe particle access and cut-off rigidities, has not evolved with the scientific advances in the field, and misunderstandings and misapplications of historical work have occurred. This paper is an attempt to remedy this situation by clarifying the areas in which changes have occurred and by providing a cross reference between the historical terms and those terms now in use for innovative cosmic-ray studies which are underway in several laboratories

  15. Defining obesity cut-off points for migrant South Asians.

    Directory of Open Access Journals (Sweden)

    Laura J Gray

    Full Text Available BACKGROUND: Body mass index (BMI and waist circumference (WC are used to define cardiovascular and type 2 diabetes risk. We aimed to derive appropriate BMI and WC obesity cut-off points in a migrant South Asian population. METHODS: 4688 White Europeans and 1333 South Asians resident in the UK aged 40-75 years inclusive were screened for type 2 diabetes. Principal components analysis was used to derive a glycaemia, lipid, and a blood pressure factor. Regression models for each factor, adjusted for age and stratified by sex, were used to identify BMI and WC cut-off points in South Asians that correspond to those defined for White Europeans. FINDINGS: For South Asian males, derived BMI obesity cut-off points equivalent to 30.0 kg/m(2 in White Europeans were 22.6 kg/m(2 (95% Confidence Interval (95% CI 20.7 kg/m(2 to 24.5 kg/m(2 for the glycaemia factor, 26.0 kg/m(2 (95% CI 24.7 kg/m(2 to 27.3 kg/m(2 for the lipid factor, and 28.4 kg/m(2 (95% CI 26.5 kg/m(2 to 30.4 kg/m(2 for the blood pressure factor. For WC, derived cut-off points for South Asian males equivalent to 102 cm in White Europeans were 83.8 cm (95% CI 79.3 cm to 88.2 cm for the glycaemia factor, 91.4 cm (95% CI 86.9 cm to 95.8 cm for the lipid factor, and 99.3 cm (95% CI 93.3 cm to 105.2 cm for the blood pressure factor. Lower ethnicity cut-off points were seen for females for both BMI and WC. CONCLUSIONS: Substantially lower obesity cut-off points are needed in South Asians to detect an equivalent level of dysglycemia and dyslipidemia as observed in White Europeans. South Asian ethnicity could be considered as a similar level of risk as obesity (in White Europeans for the development of type 2 diabetes.

  16. A PROBLEM OF CUTTING OFF THE LAMINATED SEMIS TYPE PLATE

    Directory of Open Access Journals (Sweden)

    Florin Ciofu

    2012-11-01

    Full Text Available A problem often coped on many domains such as wood manufacturing, glass, plastics and metallic platework industry, is the shaping or cutting off a big plate in many pieces. With this purpose there are algorithms of optimizing for positioning the parts following to be cut off from a row plate. From mathematical point of view, in positioning the parts on a raw plate the number of solutions increase four times evrey time a new part is added, and in case of finding the best solution for about few hundreds of pieces or parts would require years of processing on the most performant computers nowadays – for an analogy remember the famous story with the rice beads which the King had to pay to the master teaching him the chess: twice more for each square of the chessboard; for the total quantity assessment, King ascertained that the crops in his whole life wouldn’t have been enough.

  17. Overcoming cut-off restrictions in multimorbidity prevalence estimates

    OpenAIRE

    Holzer, Barbara M.; Siebenhuener, Klarissa; Bopp, Matthias; Minder, Christoph E

    2014-01-01

    Background Presently, there is no consensus on how to define multimorbidity. In this paper we investigate the connection between prevalence estimates for two or more and three or more chronic conditions to improve comparability of multimorbidity studies with different cut-offs. Methods In a systematic review of the literature published between January, 1990 and December, 2011, we found 52 suitable studies, many providing prevalence estimates for several age groups. A total of 31 studies repor...

  18. Hemoglobin cut-off values in healthy Turkish infants

    Institute of Scientific and Technical Information of China (English)

    Ahmet Arvas; Emel Gür; DurmuşDoğan

    2014-01-01

    Background: Anemia is a widespread public health problem associated with an increased risk of morbidity and mortality. This study was undertaken to determine the cut-off value of hemoglobin for infant anemia. Methods: A cross-sectional retrospective study was carried out at well-baby clinics of a tertiary care hospital. A total of 1484 healthy infants aged between 4 to 24 months were included in the study. The relationship of hemoglobin (Hb) levels with mother age, birth weight, weight gain rate, feeding, and gender was evaluated. Results: The Hb levels were assessed in four age groups (4 months, 6 months, 9-12 months, and 15-24 months) and the cut-off values of Hb were determined. Hb cut-off values (5th percentile for age) were detected as 97 g/L and 93 g/L at 4 months and 6 months, respectively. In older infants, the 5th percentile was 90.5 g/L and 93.4 g/L at 9-12 months and 15-24 months, respectively. The two values were lower than the World Health Organization criteria for anemia, which could partly due to the lack of information on iron status in our population. However, this difference highlights the need for further studies on normal Hb levels in healthy infants in developing countries. Hb levels of females were higher in all age groups; however, a statistically significant difference was found in gender in only 6 month-old infants. No statistically significant difference was found among Hb levels, mother's age, birth weight, weight gain rate, and nutritional status. Conclusion: Hb cut-off values in infants should be re-evaluated and be compatible with growth and development of children in that community.

  19. Resonance and cut-off surfaces in the ion cyclotron frequency range in toroidal geometry

    International Nuclear Information System (INIS)

    Resonances and cut-offs of the fast Alfven and ion-cyclotron waves have been studied for a multicomponent plasma in a toroidal axisymmetric geometry. The resonance and cut-off frequencies are given by eigenvalues of ordinary differential equations on the rosonance and cut-off sufaces, respectively. These surfaces coincide with magnetic surfaces. (author)

  20. Field evaluation of a cement-bentonite grout and a chlorosulfonated polyethylene fabric liner in hydrologically isolating low-level radioactive solid waste

    International Nuclear Information System (INIS)

    Two engineered modifications, trench lining and grouting, have been demonstrated and evaluated. Reinforced chlorosulfonated polyethylene (Hypalon) fabric and a Portland cement-bentonite grout were selected for demonstration within a group of nine 28-m3 experimental trenches containing compacted low-level waste generated at the Oak Ridge National Laboratory. Groundwater monitoring has shown that standing water is present in all nine experimental trenches (both treated and untreated); however, depth of water and water level fluctuation patterns differed according to trench treatment and were minimal in the case of the grouted trenches. Both water pump-in and water pump-out tests conducted on the lined trenches showed that the original goal of watertight liners was not achieved and that water was entering and leaving these trenches with each precipitation event. Water entering into the grouted trenches was inhibited by the cement-bentonite grout backfill, as reflected in the lower values of hydraulic conductivities that were measured in these three trenches compared with those in the three control (untreated) trenches. In examining engineering properties of the grout and liner material, it was found that no significant change in liner tensile strength or liner aging study, indicating that there were no short-term changes in these engineering properties with field weathering. Cover subsidence has not occurred over the grouted or control trenches, while 2 of the lined trenches have settled 7 to 10 cm (2 to 3% of the trench depth) in the first two years. Based on these treatment evaluation tests, the cement-bentonite grouted trenches appear to offer the highest level of water protection compared to the Hypalon lined and the control trenches

  1. Effective Potential in Curved Space and Cut-Off Regularizations

    CERN Document Server

    Sobreira, Flavia; Shapiro, Ilya L

    2011-01-01

    We consider derivation of the effective potential for a scalar field in curved space-time within the physical regularization scheme, using two sorts of covariant cut-off regularizations. The first one is based on the local momentum representation and Riemann normal coordinates and the second is operatorial regularization, based on the Fock-Schwinger-DeWitt proper-time representation. We show, on the example of a self-interacting scalar field, that these two methods produce equal results for divergences, but the first one gives more detailed information about the finite part. Furthermore, we calculate the contribution from a massive fermion loop and discuss renormalization group equations and their interpretation for the multi-mass theories.

  2. Negative effective mass below a cut-off frequency

    CERN Document Server

    Yao, Shanshan; Hu, Gengkai

    2010-01-01

    Acoustic metamaterials with negative effective mass below a cut-off frequency are studied. An equivalent mass-spring structure is firstly proposed for such metamaterials, the effective mass is found to follow the Drude model: being negative below a specific frequency. The peculiar behavior is then verified by transmission experiments operating in the low-frequency regime. Inspired by the mass-spring model, we investigate the two-dimensional elastic waveguide with clamped boundaries and attribute the bandgap occurring below a critical frequency to negative effective mass density. The finding helps us to design a new acoustic Drude metamaterial, which enables shearing and bending deformations, in contrast to the membrane-type ones. Both simulation and experimental results show that the proposed metamaterial exhibits negative effective mass below 1200 Hz, thus opening broadband applications in vibration and noise controls.

  3. Physical and cut-off effects of heavy sea quarks

    CERN Document Server

    Knechtli, Francesco; Bruno, Mattia; Finkenrath, Jacob; Leder, Björn; Marinkovic, Marina; Sommer, Rainer

    2014-01-01

    We simulate a theory with two dynamical O($a$) improved Wilson quarks whose mass $M$ ranges from a factor eight up to a factor two below the charm quark mass and at three values of the lattice spacing ranging from 0.066 to 0.034 fm. This theory is a prototype to study the decoupling of heavy quarks. We measure the mass and cut-off dependence of ratios of gluonic observables defined from the Wilson flow or the static potential. The size of the 1/$M$ corrections can be determined and disentangled from the lattice artifacts. The difference with the pure gauge theory is at the percent level when two quarks with a mass of the charm quark are present.

  4. Emission Enhancement in a Plasmonic Waveguide at Cut-Off

    Directory of Open Access Journals (Sweden)

    Andrea Alù

    2011-01-01

    Full Text Available Enhancement of molecular emission is usually obtained by coupling small optical emitters with external resonant structures and systems, as first established by Purcell several decades ago, and verified in several recent investigations using molecules or quantum dots coupled with plasmonic nanoantennas. Here we theoretically investigate in detail a different mechanism for emission enhancement, based on our recent idea of a plasmonic nanolauncher [Phys. Rev. Lett. 2009, 103, 043902], i.e., a metamaterial-inspired ultranarrow waveguide channel operating near its cut-off frequency. Such system is not necessarily at resonance, but its peculiar operation may provide enhanced emission over a relatively broad physical area, which may allow enhancement of emission independent of the position of an individual or of a group of molecules along such plasmonic channel, and the possibility to bend and route the emitted energy with large flexibility. We present here extensive theoretical and numerical results that confirm this intuition and may envision a novel method for molecular emission enhancement at the nanoscale, with more flexibility than the conventional Purcell resonance techniques.

  5. Singularity of macroscopic variables near boundary for gases with cut-off inverse-power potential

    OpenAIRE

    Chen, I-Kun; Hsia, Chun-Hsiung

    2014-01-01

    In this article, the boundary singularity for stationary solutions of the linearized Boltzmann equation with cut-off inverse power potential is analyzed. In particular, for cut-off hard-potential cases, we establish the asymptotic approximation for the gradient of the moments. Our analysis indicates the logarithmic singularity of the gradient of the moments.

  6. Cut-off frequency of magnetostrictive materials based on permeability spectra

    Energy Technology Data Exchange (ETDEWEB)

    Meng Hao; Zhang Tianli [Key Laboratory of Aerospace Materials and Performance (Ministry of Education), School of Materials Science and Engineering, Beihang University, Beijing 100191 (China); Jiang Chengbao, E-mail: jiangcb@buaa.edu.cn [Key Laboratory of Aerospace Materials and Performance (Ministry of Education), School of Materials Science and Engineering, Beihang University, Beijing 100191 (China)

    2012-06-15

    The loss behavior and cut-off frequency of TbDyFe alloy and TbDyFe/epoxy composite have been investigated by measuring their permeability spectra. The loss factor of TbDyFe alloy increases exponentially as the frequency goes up, while it is almost unchanged for the TbDyFe/epoxy composite. The loss factor value for the TbDyFe composite is only 4.3% of that for the monolithic TbDyFe alloy at high frequency of 10 kHz under the peak magnetic induction of 10 mT. The cut-off frequency of TbDyFe/epoxy composite is 6800 kHz, 3 orders of magnitude larger than that of TbDyFe alloy. The cut-off frequency is found to be the ferromagnetic resonance frequency and can be calculated from Snoek's law. - Highlights: Black-Right-Pointing-Pointer The cut-off frequency of TbDyFe alloy and TbDyFe/epoxy composite has been investigated. Black-Right-Pointing-Pointer Permeability spectra are used to study loss behavior and cut-off frequency. Black-Right-Pointing-Pointer A mathematic formula is deduced to predict the cut-off frequency. Black-Right-Pointing-Pointer TbDyFe/epoxy composite presents high cut-off frequency of 6800 kHz.

  7. Transmission characteristics of the wave cut-off probe with parallel plates

    Science.gov (United States)

    Kang, Hyun-Ju; Kim, Yu-Sin; Chung, Chin-Wook

    2012-10-01

    A cut-off probe has been used to obtain an absolute electron density from a plasma frequency. A cut-off probe with parallel plates was constructed to investigate the transmission characteristics of electromagnetic waves and electrostatic waves at various gaps, pressures and powers. It is found that a clear cut-off peak at a plasma frequency and many other peaks due to plasma sheath series resonance, cavity resonance and transmission line are observed. By using circuit model of plasma and transmission line theory, the various peaks was analyzed and discussed.

  8. Human papillomavirus testing in primary cervical screening and the cut-off level for hybrid capture 2 tests

    DEFF Research Database (Denmark)

    Rebolj, Matejka; Bonde, Jesper; Njor, Sisse Helle; Lynge, Elsebeth

    2011-01-01

    To determine the trade-off between the sensitivity and the specificity for high grade cervical intraepithelial neoplasia at hybrid capture 2 cut-off values above the standard = 1 relative light units/cut-off level (rlu/co).......To determine the trade-off between the sensitivity and the specificity for high grade cervical intraepithelial neoplasia at hybrid capture 2 cut-off values above the standard = 1 relative light units/cut-off level (rlu/co)....

  9. Epidemiological cut-off values for Flavobacterium psychrophilum MIC data generated by a standard test protocol

    DEFF Research Database (Denmark)

    Smith, P.; Endris, R.; Kronvall, G.;

    2016-01-01

    Epidemiological cut-off values were developed for application to antibiotic susceptibility data for Flavobacterium psychrophilum generated by standard CLSI test protocols. The MIC values for ten antibiotic agents against Flavobacterium psychrophilum were determined in two laboratories. For five...

  10. Spin cut-off factor in SPA and SPA + RPA approach

    International Nuclear Information System (INIS)

    Spin cut-off factor (σ) is an important parameter needed in Bethe's formula for the fixed-J level density. The parameter σ is also required to relate the theoretical calculated state density with the experimentally observed level density

  11. Surface effect theory in binary alloys: surfaces with cut-off

    International Nuclear Information System (INIS)

    A surface effect theory in binary alloys which ore ordered with surfaces with cut-off is presented. This theory is based in a model of pair interaction between first neighbours and includes long and short range effects. The (120) surface with sup(-) (110) monoatomic cut-off and terrace in the (110) planes of an alloy with body centered cubic structure is presented as example. Results for the concentrations in all the different surface sites are given. (L.C.)

  12. Phase properties of the cut-off high-order harmonics

    CERN Document Server

    Khokhlova, M A

    2015-01-01

    The cut-off regime of high-order harmonic generation (HHG) by atoms in an intense laser field is studied numerically and analytically. We find that the cut-off regime is characterized by equal dephasing between the successive harmonics. The change of the harmonic phase-locking when HHG evolves from the cut-off to the plateau regime determines the optimal bandwidth of the spectral region which should be used for attosecond pulse generation via amplitude gating technique. The cut-off regime is also characterized by a linear dependence of the harmonic phase on the fundamental intensity. The proportionality coefficient grows as the cube of the fundamental wavelength, thus this dependence becomes very important for the HHG by mid-infrared fields. Moreover, for every high harmonic there is a {\\it range} of laser intensities providing the generation in the cut-off regime and the atomic response magnitude in this regime can be greater than that in the plateau regime. Thus the cut-off regime substantially contributes ...

  13. RAdio-nuclides Migration DAtasets (RAMDA) on cement, bentonite and rock for the performance assessment of TRU waste repository in Japan

    International Nuclear Information System (INIS)

    In Japan, some of low-level radioactive wastes (LLW) containing nuclides with long half-lives, such as transuranium (TRU) nuclides, fission products (e.g. iodine-129) and activation products (e.g. carbon-14), will be generated by the operation and decommissioning of domestic and overseas reprocessing plants for spent nuclear fuel and a domestic MOX fuel fabrication plant. Such wastes are termed 'TRU waste'. The high activity wastes of them are panned to dispose under deep under-ground in future. The Federation of Electric Power Companies (FEPC) and the Japan Nuclear Cycle Development Institute (JNC) have been caring out the performance assessment (PA) for TRU waste disposal system. In this report, radio-nuclides migration datasets (RAMDA) of cement, bentonite and rocks for the PA are described. RAMDA contains the following dataset: Radio-nuclides solubility, Effective diffusion coefficient of radio-nuclide, Sorption of radio-nuclide. For the establishment of RAMDA, the long-term evolution of the engineered barriers, such as cement mortar and compacted bentonite, was considered. (author)

  14. Calculating broad neutron resonances in a cut-off Woods-Saxon potential

    CERN Document Server

    Baran, Á; Salamon, P; Vertse, T

    2015-01-01

    In a cut-off Woods-Saxon potential with realistic depth $S$-matrix poles being far from the imaginary wave number axis form a sequence where the distances of the consecutive resonances are inversely proportional with the cut-off radius value. Other poles lying closer to the imaginary wave number axis might have trajectories with irregular shapes as the depth of the potential increases. Poles being close repel each other, and their repulsion is responsible for the changes of the directions of the corresponding trajectories. The interaction is extremely sensitive to the cut-off radius value. The repulsion might cause that certain resonances become antibound and later resonances again when they collide on the imaginary axis.

  15. Calculating broad neutron resonances in a cut-off Woods-Saxon potential

    Energy Technology Data Exchange (ETDEWEB)

    Baran, A.; Noszaly, Cs. [Faculty of Informatics, University of Debrecen, PO Box 12, Debrecen (Hungary); Salamon, P. [Hungarian Academy of Sciences (ATOMKI), Institute for Nuclear Research, PO Box 51, Debrecen (Hungary); Vertse, T. [Faculty of Informatics, University of Debrecen, PO Box 12, Debrecen (Hungary); Hungarian Academy of Sciences (ATOMKI), Institute for Nuclear Research, PO Box 51, Debrecen (Hungary)

    2015-07-15

    In a cut-off Woods-Saxon (CWS) potential with realistic depth S -matrix poles being far from the imaginary wave number axis form a sequence where the distances of the consecutive resonances are inversely proportional with the cut-off radius value, which is an unphysical parameter. Other poles lying closer to the imaginary wave number axis might have trajectories with irregular shapes as the depth of the potential increases. Poles being close repel each other, and their repulsion is responsible for the changes of the directions of the corresponding trajectories. The repulsion might cause that certain resonances become antibound and later resonances again when they collide on the imaginary axis. The interaction is extremely sensitive to the cut-off radius value, which is an apparent handicap of the CWS potential. (orig.)

  16. Investigation of the negative-mass behaviors occurring below a cut-off frequency

    Science.gov (United States)

    Yao, Shanshan; Zhou, Xiaoming; Hu, Gengkai

    2010-10-01

    Negative-mass phenomena occurring below a cut-off frequency are examined using both theoretical and experimental methods. The paper begins with an investigation of a mass-spring structure, the effective mass of which is shown to be negative below a specific frequency. Due to the decaying nature of lattice waves in the negative-mass system, the transmission drop induced by negative effective mass is demonstrated experimentally. Further investigation is conducted for a rectangular solid waveguide with clamped boundary conditions. It is shown that the lowest bandgap mode of the clamped waveguide can be attributed to negative effective mass below a cut-off frequency. Based on this observation, elastic metamaterials made of a steel grid filled with styrene butadiene rubber are designed and fabricated. Both the simulation and experimental analyses demonstrate that the designed metamaterials have negative effective mass below a cut-off frequency.

  17. Cosmic ray cut-off rigidities as function of zenithal and azimuthal directions of arrival

    International Nuclear Information System (INIS)

    Dependences of cut-off rigidities for slantingly incident cosmic rays on the direction of their arrival into the Earth magnetic field caused by internal and external sources are investigated for Irkutsk station under the conditions of magnetosphere different geomagnetic activity. It is shown that with the increase of Kp index from 0 up to 4 the cut-off rigidities of slantingly incident cosmic rays decrease in succession, whereupon the effect of external sources (currents within the magnetopause, tail current and ring currents) results in different changes of geomagnetic thresholds for different directions of charged particle arrival. Thus, for example, cut-off-rigidities reduce by 6% for particles which arrive from southwest at 360 deg zenith angle, while for westparticles this difference constitutes only 0.6%

  18. Cut-off parameters in the one-dimensional two-fermion model

    International Nuclear Information System (INIS)

    It is shown that the usual cut-off procedure (α cut-off parameter) employed in the boson representation of the fermion field opepators of the one-djmensional two-fermion model (TFM) is an incorrect one as the computator of the hermitean-conjugate field operators at the same space-point fails to fulfil a certain relationship which was pointed out long ago by Jordan. The complete form of the boson representation (including the zero-mode) of a single fermion field and the correct values of the cut-off parameter α is reviewed following Jordan and generalized to the TFM. The cut-off parameter α corresponds to a bandwidth cut-off and Jordan's boson representation is exact only in the limit α → 0. The additional zero-mode terms make the exact solution of the backscattering and umklapp scattering problem to be valid only if a supplementary condition is imposed on the coupling constants. Using the present bosonization technique all the inconsistencies of the TFM are removed. The one-particle Green's function and response functions of the Tomonaga-Luttinger model (TLM) are calculated and found to be identical with those obtained by direct diagram summation. The energy gap appearing in the spectrum of the TFM with backscattering and umklapp scattering for certain values of the coupling constants is shown to be proportional to the momentum transfer cut-off γ-1 which has to be kept finite while α goes to zero. Under such conditions the anticommunication relations and Jordan's commutator are invariant under the canonical transformation on the boson operators that diagonalizes the Hamiltonian of the TLM. The charge-density response function of the TFM with backscattering is perturbationally calculated up to the first order. The cut-off α-1 applies in the same way to terms which differ only by their spin indices in the expression of this response function. The charge-density response function is also evaluated at low frequencies for the exactly soluble TFM with

  19. Localization of fluctuation measurement by wave scattering close to a cut off layer

    International Nuclear Information System (INIS)

    In tokamaks several fluctuation diagnostics are based on the scattering of an electromagnetic wave close to a cut off layer. For example measurement of density fluctuations (n) by reflectometry and magnetic fluctuations (B) by cross polarization scattering. For such a configuration the eikonal approximation does not remain valid to describe the pump wave although it is valid to describe n(r) and B(r). In this paper we shall consider a linear density profile. An unidimensional exact analysis has been performed. Spatial and spectral localization of scattering process close to the cut off layer is investigated and a modified Bragg rule is derived. (author) 6 refs., 2 figs

  20. Duality Bounds on the Cut-Off Rate with Applications to Ricean Fading

    OpenAIRE

    Lapidoth, Amos; Miliou, Natalia

    2005-01-01

    We propose a technique to derive upper bounds on Gallager's cost-constrained random coding exponent function. Applying this technique to the non-coherent peak-power or average-power limited discrete time memoryless Ricean fading channel, we obtain the high signal-to-noise ratio (SNR) expansion of this channel's cut-off rate. At high SNR the gap between channel capacity and the cut-off rate approaches a finite limit. This limit is approximately 0.26 nats per channel-use for zero specular compo...

  1. Cut-off rate calculations for the outer channel in a concatenated cooling system

    Science.gov (United States)

    Herro, M. A.; Costello, D. J., Jr.; Hu, L.

    1984-01-01

    Concatenated codes were long used as a practical means of achieving long block or constraint lengths for combating errors on very noisy channels. The inner and outer encoders are normally separated by an interleaver, so that decoded error bursts coming from the inner decoder are randomized before entering the outer decoder. The effectiveness of this interleaver is examined by calculating the cut-off rate of the outer channel seen by the outer decoder with and without interleaving. Interleaving never hurts the performance of a concatenated code, and when the inner code rate is near the cut-off rate of the inner channel, interleaving significantly improves code performance.

  2. Suppressing the weakly bound states in the photoassociation dynamics by using a frequency cut-off laser pulse

    International Nuclear Information System (INIS)

    The photoassociation dynamics of ultracold lithium atoms controlled by a cut-off pulse has been investigated theoretically by solving numerically the time-dependent Schrödinger equation using the mapped Fourier grid method. The frequency components of the laser pulse close to the atomic resonance are partly cut off. Compared with the typical Gauss-type pulses, the cut-off pulse is helpful to suppress efficiently the weakly bound states and prepare the associated molecules in the lower vibrational states. Especially, the dependence of photoassociation probability on the cut-off position of the laser pulse is explored. (atomic and molecular physics)

  3. Establishing Streptomycin Epidemiological Cut-Off Values for Salmonella and Escherichia coli

    DEFF Research Database (Denmark)

    Migura, Lourdes Garcia; Sunde, Marianne; Karlsmose, Susanne;

    2011-01-01

    This study was conducted to elucidate the accuracy of the current streptomycin epidemiological cut-off value (ECOFF) for Escherichia coli and Salmonella spp. A total of 236 Salmonella enterica and 208 E. coli isolates exhibiting MICs between 4 and 32 mg/L were selected from 12 countries. Isolates...

  4. Poverty and cutting off the power: Evaluation of the social contract of the Electricite de France

    International Nuclear Information System (INIS)

    Measures put in place by the French Electric Utility, Electricite de France (EDF) to assist those in default of payment of their electricity bills are evaluated. When introduced in 1996, it was expected that the new measures would reduce the necessity of cutting off power to the poor by one third. Notwithstanding these expectations and some progress in reducing the rate of power cut-off, the number of instances where service was denied, has risen. The evaluation is based on the annual survey of poor clients of the EDF undertaken by the Polling Institute Lavialle. The annual survey concerns itself chiefly with the attitude towards the service and the quality of dialogue between the Utility and its clients. The analysis resulted in three conclusions: (1) EDF appears to make progress in dealing with the problem based on evidence of higher client satisfaction and lower rate of cutting off power; (2) there is evidence of important beneficial changes in the policies of local EDF centres; and (3) there is noticeable evidence of improved coordination with social services agencies and higher quality of information made available; both these factors should contribute to higher client satisfaction. In general, EDF is to be congratulated for their efforts to date, for commissioning the survey and for participating in the evaluation. Nevertheless, in France the instances of cutting off electricity to poor households is still a fact of life, despite the commitment and the new measures put in place by EDF. 21 refs., 7 tabs., 1 fig

  5. The INTEGRAL high energy cut-off distribution of Seyfert galaxies

    Science.gov (United States)

    Malizia, Angela; Ubertini, Pietro; Bird, Antony; Bazzano, Angela; Stephen, John; Molina, Manuela; Bassani, Loredana

    We present the primary continuum parameters, the photon index and the high energy cut-off, of Seyfert galaxies extracted from the INTEGRAL complete sample of AGN. We performed a broad band (0.3-100 keV) spectral analysis by fitting simultaneously the soft and hard X-ray spectra obtained by XMM and INTEGRAL/IBIS-Swift/BAT respectively in order to investigate the general properties of these parameters in particular their distribution and mean values. We present the mean photon index for the t type 1 and type 2 objects of the whole sample as well as their mean high energy cut-off. This is the first time that the cut-off energy is constrained in a such large number of AGN. Using the main parameters of the primary continuum, we are able to obtain the actual physical parameters of the Comptonizing region i.e. the plasma temperature kTe the optical depth tau. Finally, with the high S/N spectra starting to come from NuSTAR it will soon be possible to better constrain the cut-off values in many AGN, allowing the determination of more physical models and so to better understand the continuum emission and geometry of the region surrounding black holes.

  6. The INTEGRAL high energy cut-off distribution of type 1 AGN

    CERN Document Server

    Malizia, A; Bassani, L; Stephen, J B; Bazzano, A; Ubertini, P; Bird, A J

    2014-01-01

    In this letter we present the primary continuum parameters, the photon index Gamma and the high energy cut-off Ec, of 41 type-1 Seyfert galaxies extracted from the INTEGRAL complete sample of AGN. We performed a broad band (0.3-100 keV) spectral analysis by fitting simultaneously the soft and hard X-ray spectra obtained by XMM and INTEGRAL/IBIS-Swift/BAT respectively in order to investigate the general properties of these parameters in particular their distribution and mean values. We find a mean photon index for the whole sample of 1.73 with a standard deviation of 0.17 and a mean high energy cut-off of 128 keV with a standard deviation of 46 keV. This is the first time that the cut-off energy is constrained in a such large number of AGN. We have 26 measurements of the cut-off, which corresponds to 63% of the entire sample, distributed between 50 and 200 keV. There are a further 11 lower limits mostly below 300 keV. Using the main parameters of the primary continuum, we have been able to obtain the actual ph...

  7. Chronic kidney disease : Defining clinical cut-offs for albumin:creatinine ratio

    NARCIS (Netherlands)

    Bakker, Stephan J L

    2013-01-01

    Albuminuria is rapidly gaining recognition as a marker of the presence and of the progression of chronic kidney disease (CKD). In a new study, Naresh et al. attempt to define cut-off values for percentage change in urinary albumin:creatinine ratio that reflect changes in CKD status rather than rando

  8. The INTEGRAL High-energy Cut-off Distribution of Type 1 Active Galactic Nuclei

    Science.gov (United States)

    Malizia, A.; Molina, M.; Bassani, L.; Stephen, J. B.; Bazzano, A.; Ubertini, P.; Bird, A. J.

    2014-02-01

    In this Letter we present the primary continuum parameters, the photon index Γ, and the high-energy cut-off E c of 41 type-1 Seyfert galaxies extracted from the International Gamma-Ray Astrophysics Laboratory (INTEGRAL) complete sample of active galactic nuclei (AGNs). We performed broadband (0.3-100 keV) spectral analysis by simultaneously fitting the soft and hard X-ray spectra obtained by XMM and INTEGRAL/IBIS-Swift/BAT, respectively, in order to investigate the general properties of these parameters, in particular their distribution and mean values. We find a mean photon index of 1.73 with a standard deviation of 0.17 and a mean high-energy cut-off of 128 keV with a standard deviation of 46 keV for the whole sample. This is the first time that the cut-off energy is constrained in such a large number of AGNs. We have 26 measurements of the cut-off, which corresponds to 63% of the entire sample, distributed between 50 and 200 keV. There are a further 11 lower limits mostly below 300 keV. Using the main parameters of the primary continuum, we have been able to obtain the actual physical parameters of the Comptonizing region, i.e., the plasma temperature kT e from 20 to 100 keV and the optical depth τ < 4. Finally, with the high signal-to-noise ratio spectra starting to come from NuSTAR it will soon be possible to better constrain the cut-off values in many AGNs, allowing the determination of more physical models and thus better understand the continuum emission and geometry of the region surrounding black holes.

  9. Raised BMI cut-off for overweight in Greenland Inuit – a review

    Directory of Open Access Journals (Sweden)

    Stig Andersen

    2013-08-01

    Full Text Available Background. Obesity is associated with increased morbidity and premature death. Obesity rates have increased worldwide and the WHO recommends monitoring. A steep rise in body mass index (BMI, a measure of adiposity, was detected in Greenland from 1963 to 1998. Interestingly, the BMI starting point was in the overweight range. This is not conceivable in a disease-free, physically active, pre-western hunter population. Objective. This led us to reconsider the cut-off point for overweight among Inuit in Greenland. Design and findings. We found 3 different approaches to defining the cut-off point of high BMI in Inuit. First, the contribution to the height by the torso compared to the legs is relatively high. This causes relatively more kilograms per centimetre of height that increases the BMI by approximately 10% compared to Caucasian whites. Second, defining the cut-off by the upper 90-percentile of BMI from height and weight in healthy young Inuit surveyed in 1963 estimated the cut-off point to be around 10% higher compared to Caucasians. Third, if similar LDL-cholesterol and triglycerides are assumed for a certain BMI in Caucasians, the corresponding BMI in Inuit in both Greenland and Canada is around 10% higher. However, genetic admixture of Greenland Inuit and Caucasian Danes will influence this difference and hamper a clear distinction with time. Conclusion. Defining overweight according to the WHO cut-off of a BMI above 25 kg/m2 in Greenland Inuit may overestimate the number of individuals with elevated BMI.

  10. Cut-off period for slow magnetoacoustic waves in coronal plasma structures

    Science.gov (United States)

    Afanasyev, A. N.; Nakariakov, V. M.

    2015-10-01

    Context. There is abundant observational evidence of longitudinal compressive waves in plasma structures of the solar corona, which are confidently interpreted in terms of slow magnetoacoustic waves. The uses of coronal slow waves in plasma diagnostics, as well as analysis of their possible contribution to coronal heating and the solar wind acceleration, require detailed theoretical modelling. Aims: We investigate the effects of obliqueness, magnetic field, and non-uniformity of the medium on the evolution of long-wavelength slow magnetoacoustic waves guided by field-aligned plasma non-uniformities, also called tube waves. Special attention is paid to the cut-off effect due to the gravity stratification of the coronal plasma. Methods: We study the behaviour of linear tube waves in a vertical untwisted straight field-aligned isothermal plasma cylinder. We apply the thin flux tube approximation, taking into account effects of stratification caused by gravity. The dispersion due to the finite radius of the flux tube is neglected. We analyse the behaviour of the cut-off period for an exponentially divergent magnetic flux tube filled in with a stratified plasma. The results obtained are compared with the known cases of the constant Alfven speed and the pure acoustic wave. Results: We derive the wave equation for tube waves and reduce it to the form of the Klein-Gordon equation with varying coefficients, which explicitly contains the cut-off frequency. The cut-off period is found to vary with height, decreasing significantly in the low-beta plasma and in the plasma with the beta of the order of unity. The depressions in the cut-off period profiles can affect the propagation of longitudinal waves along coronal plasma structures towards the higher corona and can form coronal resonators.

  11. Multiple Sclerosis Questionnaire for Job Difficulties (MSQ-Job): definition of the cut-off score.

    Science.gov (United States)

    Schiavolin, Silvia; Giovannetti, Ambra Mara; Leonardi, Matilde; Brenna, Greta; Brambilla, Laura; Confalonieri, Paolo; Frangiamore, Rita; Mantegazza, Renato; Moscatelli, Marco; Clerici, Valentina Torri; Cortese, Francesca; Covelli, Venusia; Ponzio, Michela; Zaratin, Paola; Raggi, Alberto

    2016-05-01

    Multiple Sclerosis (MS) mainly affects people of working age. The Multiple Sclerosis Questionnaire for Job Difficulties (MSQ-Job) was designed to measure difficulties in work-related tasks. Our aim is to define cut-off score of MSQ-Job to identify potential critical situations that might require specific attention. A sample of patients with MS completed the MSQ-Job, WHODAS 2.0 and MSQOL-54 respectively for work difficulties, disability and health-related quality of life (HRQoL) evaluation. K-means Cluster Analysis was used to divide the sample in three groups on the basis of HRQoL and disability. ANOVA test was performed to compare the response pattern between these groups. The cut-off score was defined using the receiver operating characteristic (ROC) curve analyses for MSQ-Job total and count of MSQ-Job items scores ≥3: a score value corresponding to the maximum of the sensitivity-to-specificity ratio was chosen as the cut-off. Out of 180 patients enrolled, twenty were clustered in the higher severity group. The area under the ROC curve was 0.845 for the MSQ-Job total and 0.859 for the count of MSQ-Job items scores ≥3 while the cut-off score was 15.8 for MSQ-Job total and 8 for count of items scored ≥3. We recommend the use of MSQ-Job with this calculation as cut-off for identifying critical situations, e.g. in vocational rehabilitation services, where work-related difficulties have a significant impact in terms of lower quality of life and higher disability. PMID:26842465

  12. Determination of a saliva cotinine cut-off to distinguish pregnant smokers from pregnant non-smokers

    DEFF Research Database (Denmark)

    Hegaard, Hanne K; Kjaergaard, Hanne; Møller, Lars F; Wachmann, Carsten Henrik; Ottesen, Bent

    2007-01-01

    Objective validation of smoking status is necessary. Earlier studies have used saliva cotinine concentrations between 14.2 and 30 ng/ml as cut-off values to distinguish pregnant smokers from non-smokers. However, these cut-offs derive from studies including men and non-pregnant women. This...

  13. Mathematical model of processes in cut-off leaking steam generator as a part of operating ship reactor

    International Nuclear Information System (INIS)

    A mathematical model of processes in cut-off leaking steam generator of an operating ship reactor was presented. The model describes the coolant pressure increasing when filling the heat pipes system of cut-off leaking direct-flow steam generator, and allows estimating the time lag before putting restrictions on power maneuvering of the ship reactor

  14. Fast beam cut-off method in RF-knockout extraction for spot-scanning

    CERN Document Server

    Furukawa, T

    2002-01-01

    An irradiation method with magnetic scanning has been developed in order to provide accurate irradiation even for an irregular target shape. The scanning method has strongly required a lower ripple of the beam spill and a faster response to beam-on/off in slow extraction from a synchrotron ring. At HIMAC, RF-knockout extraction has utilized a bunched beam to reduce the beam-spill ripple. Therefore, particles near the resonance can be spilled out from the separatrices by synchrotron oscillation as well as by a transverse RF field. From this point of view, a fast beam cut-off method has been proposed and verified by both simulations and experiments. The maximum delay from the beam cut-off signal to beam-off has been improved to around 60 mu s from 700 mu s by a usual method. Unwanted dose has been considerably reduced by around a factor of 10 compared with that by the usual method.

  15. "Cut-off" effect of antioxidants and/or probes of variable lipophilicity in microheterogeneous media.

    Science.gov (United States)

    Aliaga, Carolina; López de Arbina, Amaia; Rezende, Marcos Caroli

    2016-09-01

    The activities of two hydrophilic (ascorbic acid and Trolox) and two hydrophobic (α-tocopherol and BHT) antioxidants were measured by reaction with a series of 4-alkanoyloxyTEMPO radical probes 1 in buffered (pH 7), aqueous, micellar solutions of reduced Triton-X 100. In all cases, a cut-off effect was observed, in line with previous observations of the same effect for the partitioning of probe series 1 in this medium. These results support an interpretation of the cut-off effect in food emulsions, based on the "amphiphobic" nature of either the antioxidants or probes: competition between two molecular moieties, for the micellar hydrophobic core, tends to expose a reacting fragment differently to a more hydrophilic microenvironment, as the probe or antioxidant hydrophobicity increases. PMID:27041306

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

    Science.gov (United States)

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

    2016-07-01

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

  17. Interacting Entropy-Corrected Holographic Dark Energy and IR Cut-Off Length

    Science.gov (United States)

    Sadeghi, J.; Pourhassan, B.; Abbaspour Moghaddam, Z.

    2014-01-01

    In this paper we consider holographic dark energy model with corrected holographic energy density and show that this model may be equivalent to the modified Chaplygin gas model. Then we obtain relation between entropy corrected holographic dark energy model and scalar field models. We do these works by using choices of IR cut-off length proportional to the Hubble radius, the event horizon radius, the Ricci length, and the Granda-Oliveros length.

  18. Interacting Entropy-Corrected Holographic Dark Energy and IR Cut-Off Length

    CERN Document Server

    Sadeghi, J; Moghaddam, Z Abbaspour

    2013-01-01

    In this paper we consider holographic dark energy model with corrected holographic energy density and show that this model may be equivalent to the modified Chaplygin gas model. Then we obtain relation between entropy corrected holographic dark energy model and scalar field models. We do these works by using choices of IR cut-off length proportional to the Hubble radius, the event horizon radius, the Ricci length, and the Granda-Oliveros length.

  19. Validity of Alternative Cut-Off Scores for the Back-Saver Sit and Reach Test

    Science.gov (United States)

    Looney, Marilyn A.; Gilbert, Jennie

    2012-01-01

    The purpose of the study was to determine if currently used FITNESSGRAM[R] cut-off scores for the Back Saver Sit and Reach Test had the best criterion-referenced validity evidence for 6-12 year old children. Secondary analyses of an existing data set focused on the passive straight leg raise and Back Saver Sit and Reach Test flexibility scores of…

  20. Sensitivity studies of spin cut-off models on fission fragment observables

    OpenAIRE

    Thulliez L.; Litaize O.; Serot O.

    2016-01-01

    A fission fragment de-excitation code, FIFRELIN, is being developed at CEA Cadarache. It allows probing the characteristics of the prompt emitted particles, neutrons and gammas, during the de-excitation process of fully accelerated fission fragments. The knowledge of the initial states of the fragments is important to accurately reproduce the fission fragment observables. In this paper a sensitivity study of various spin cut-off models, completely defining the initial fission fragment angular...

  1. Effectiveness and Cut off Points of Anthropometric Measurements in Predicting Metabolic Syndrome in Turkish Women

    Directory of Open Access Journals (Sweden)

    Sultan Keskin Demircan1

    2016-03-01

    Full Text Available Objective: Examination of the anthropometric methods and cut off points that are most appropriate to predict metabolic syndrome (MS for the female Turkish population. Methods: Waist circumference (WC, waist-hip ratio (WHR, body mass index (BMI, arm circumference (AC, total skin thickness (TST using caliper, body fat percentage (BFP and fat free mass (FFM using bioelectrical impedance were taken in 202 female patients. Blood glucose, lipid panel and blood pressure were also checked. We defined two different MS excluding anthropometric measurements. Low HDL and high triglyceride were separate criteria in the first definition; dyslipidemia was defined one criteria as low HDL and/or high triglyceride and/or triglyceride/HDL≥3 in the second. Efficiency, sensitivity and specificity of anthropometric measurements in predicting MS criteria were assessed using ROC analysis. Results: When compared in determining three or more of the MS parameters of dysglicemia, low HDL, high triglyceride and hypertension, BMI, WC, BFP, WHR and AC were found to be significant (p<0.0001. TST was significant as well (p=0.001. FFM was insignificant (p=0.337. Cut off points for BMI, WC and WHR in predicting MS were 27.7 kg/m2, 92.5 cm, 0.86. When dyslipidemia was defined in one criteria, cut off points were found similarly 27.8 kg/m2, 92.5 cm, 0.86. Conclusion: BMI, WHR, BFP and WC were more valuable than TST and AC in predicting MS but they had no statistically significant superiority over each other. However, with a 95% confidence interval, predictive cut off points were significantly above those observed in western populations.

  2. Cut-off proposal for the detection of ketamine in hair.

    Science.gov (United States)

    Salomone, A; Gerace, E; Diana, P; Romeo, M; Malvaso, V; Di Corcia, D; Vincenti, M

    2015-03-01

    Ketamine is a powerful anesthetic drug used in both human and veterinary surgery, but it is also commonly misused because of its psychotropic properties. Since the abuse of this drug has been reported in many countries worldwide, its determination in hair samples is offered as a specialist test by hundreds of laboratories. However, unlike other common drugs of abuse, a cut-off level for ketamine in hair has not been fixed yet. Therefore, aim of this study is to propose a concentration value for ketamine in hair analysis, in order to discriminate between chronic and occasional use, and between active use and external contamination. After considering the chemical properties of this molecule, and the experimental data collected in our laboratory or reported in several other published studies, we propose a cut-off level of 0.5ng/mg, as indicative of repeated exposure to ketamine. Additionally, we suggest that the detection of the metabolite norketamine should be mandatory to prove active intake and exclude false positive result from external contamination. Thus, a reasonable cut-off value for norketamine could be fixed at 0.1ng/mg, while the minimal concentration ratio norketamine/ketamine may be positively established at 0.05. PMID:25616219

  3. Spectral geometry with a cut-off: topological and metric aspects

    CERN Document Server

    D'Andrea, Francesco; Martinetti, Pierre

    2013-01-01

    Inspired by regularization in quantum field theory, we study topological and metric properties of spaces in which a cut-off is introduced. We work in the framework of noncommutative geometry, and focus on Connes distance associated to a spectral triple (A,H,D). A high momentum (short distance) cut-off is implemented by the action of a projection P on the Dirac operator D and/or on the algebra A. This action induces two new distances. We first individuate conditions making them equivalent to the original distance. We then study the Gromov-Hausdorff limit of the set of truncated states, first for quantum metric spaces in the sense of Rieffel, and then for arbitrary spectral triples. In the commutative case, we show that the cut-off induces a minimal length between points, which is infinite if P has finite rank. When P is a spectral projection of D, we work out an approximation of points by non-pure states that are at finite distance from each other. We apply the results to Moyal plane and to the fuzzy sphere, o...

  4. Impact of cut-off probability on emergency planning zone sizing for advanced light water reactors

    International Nuclear Information System (INIS)

    In 1997, NRC performed an evaluation of emergency planning for the evolutionary and advanced light water reactors, and indicated that no changes to emergency planning (EP) requirements were warranted in the existing technical framework. How- ever, NRC also recognized if the lower probability of severe accidents or the longer time period between accident initiation and release of radioactive material was considered, the changes to EP requirements for advanced light water reactors might be warranted and the emergency planning zone (EPZ) sizing might be reduced. This means that if the accidents which probabilities are lower than a cut-off probability are not considered, there may be a significant impact on the EPZ sizing. AP1000 was selected as an example in this study and the probable impacts of different cut-off probabilities were studied by using MACCS code in accordance with the NUREG-0396 method. The results show that, only if the cut-off probability is higher than the occurrence probability of the accident which has relatively serious consequence and high probability, there will be a significant impact on the EPZ sizing for the advanced light water reactor. (authors)

  5. Evaluation of novel large cut-off ultrafiltration membranes for adenovirus serotype 5 (Ad5 concentration.

    Directory of Open Access Journals (Sweden)

    Piergiuseppe Nestola

    Full Text Available The purification of virus particles and viral vectors for vaccine and gene therapy applications is gaining increasing importance in order to deliver a fast, efficient, and reliable production process. Ultrafiltration (UF is a widely employed unit operation in bioprocessing and its use is present in several steps of the downstream purification train of biopharmaceuticals. However, to date few studies have thoroughly investigated the performance of several membrane materials and cut-offs for virus concentration/diafiltration. The present study aimed at developing a novel class of UF cassettes for virus concentration/diafiltration. A detailed study was conducted to evaluate the effects of (i membrane materials, namely polyethersulfone (PES, regenerated cellulose (RC, and highly cross-linked RC (xRC, (ii nominal cut-off, and (iii UF device geometry at different production scales. The results indicate that the xRC cassettes with a cut-off of approximately 500 kDa are able to achieve a 10-fold concentration factor with 100% recovery of particles with a process time twice as fast as that of a commercially available hollow fiber. DNA and host cell protein clearances, as well as hydraulic permeability and fouling behavior, were also assessed.

  6. Defining a BMI Cut-Off Point for the Iranian Population: The Shiraz Heart Study.

    Science.gov (United States)

    Babai, Mohammad Ali; Arasteh, Peyman; Hadibarhaghtalab, Maryam; Naghizadeh, Mohammad Mehdi; Salehi, Alireza; Askari, Alireza; Homayounfar, Reza

    2016-01-01

    In this study we evaluated and redefined the optimum body mass index (BMI) cut-off point for the Iranian population based on metabolic syndrome (MeS) risk factors. We further evaluated BMI cut-off points with and without waist circumference (WC) as a cofactor of risk and compared the differences. This study is part of the largest surveillance programs conducted in Shiraz, Iran, termed the Shiraz Heart study. Our study sample included subjects between the ages of 20 to 65 years old. After excluding pregnant women, those with missing data and those with comorbid disease, a total of 12283 made up the study population. The participants underwent a series of tests and evaluations by trained professionals in accordance with WHO recommendations. Hypertension, abnormal fasting blood sugar (FBS), triglyceride (TG) and high density lipoprotein cholesterol (HDL) (in the context of the definition of metabolic syndrome) were prevalent among 32.4%, 27.6%, 42.1 and 44.2% of our participants, respectively. Women displayed higher rates of overall obesity compared to men (based on the definition by the WHO as higher than 30 kg/m2). Regarding MeS, 38.9% of our population had the all symptoms of MeS which was more prevalent among women (41.5% vs. 36%). When excluding WC in the definition of MeS, results showed that males tend to show a higher rate of metabolic risk factors (19.2% vs. 15.6%). Results of multivariate analysis showed that parallel to an increase in BMI, the odds ratio (OR) for acquiring each component of the metabolic syndrome increased (OR = 1.178; CI: 1.166-1.190). By excluding WC, the previous OR decreased (OR = 1.105; CI: 1.093-1.118). Receiver Operating Characteristic (ROC) curve analysis showed that the optimum BMI cut-off point for predicting metabolic syndrome was 26.1 kg/m2 and 26.2 kg/m2 [Accuracy (Acc) = 69% and 61%, respectively)] for males and females, respectively. The overall BMI cut-off for both sexes was 26.2 kg/m2 (Acc = 65%) with sensitivity and

  7. Determination of a saliva cotinine cut-off to distinguish pregnant smokers from pregnant non-smokers

    DEFF Research Database (Denmark)

    Hegaard, Hanne K; Kjaergaard, Hanne; Møller, Lars F;

    2007-01-01

    Objective validation of smoking status is necessary. Earlier studies have used saliva cotinine concentrations between 14.2 and 30 ng/ml as cut-off values to distinguish pregnant smokers from non-smokers. However, these cut-offs derive from studies including men and non-pregnant women. This...... constitutes a problem, as recent studies have reported an accelerated metabolism in pregnant smokers. The aim of this study was to determine the optimum cut-off cotinine level distinguishing pregnant smokers from pregnant non-smokers....

  8. On-site raw gas cut-off during the shut down of Baosteel phase I coke ovens

    Institute of Scientific and Technical Information of China (English)

    ZHOU Haizhong

    2015-01-01

    The preparation and implementation of raw coke oven gas cut-off,which was the key process involved with shutting down the Baosteel phase I coke ovens,were investigated,and the main technical points and countermeasures are presented.

  9. Ultrahigh energy neutrinos scattering off relic light neutrinos to explain UHECR above GZK cut off and thin blazars

    CERN Document Server

    Fargion, D; Fargion, Daniele; Mele, Barbara

    1999-01-01

    UHE neutrinos may transfer highest cosmic-rays energies overcoming $2.75K^\\circ$ BBR and radio-waves opacities (the GZK cut off) from most distant AGN sources at the age of the Universe. These UHE $\

  10. Lowering the cut off value of an automated chlamydia enzyme immunoassay and confirmation by PCR and direct immunofluorescent antibody test.

    OpenAIRE

    Tong, C Y; Donnelly, C; Hood, N

    1997-01-01

    AIMS: To increase the sensitivity of an automated chlamydia enzyme immunoassay by significantly lowering its cut off value, and to maintain specificity by confirmation with polymerase chain reaction (PCR) and direct immunofluorescent antibody test (DFA). METHODS: Over five months, the cut off value of the enzyme immunoassay used to screen urogenital samples for chlamydia antigen was reduced from 80 to 10. Samples with a test value of 10 or above were further tested with a commercial PCR assay...

  11. Cut-off values of blessed dementia rating scale and its clinical application in elderly Taiwanese.

    Science.gov (United States)

    Yang, Yuan-Han; Lai, Chiou-Lian; Lin, Ruey-Tay; Tai, Chih-Ta; Liu, Ching-Kuan

    2006-08-01

    Although the Blessed Dementia Rating Scale (BDRS), a clinical screening instrument, has been applied extensively, no suitable cut-off values and clinical application have been proposed, particularly in mild cognitive impairment (MCI), the precursor of dementia. The BDRS, Mini Mental State Examination (MMSE), and Clinical Dementia Rating Scale (CDR) were administrated in people aged 65 years and above, who were enrolled from southern Taiwan with multistep stratified random sampling and followed-up for 2 years. All subjects (total number = 3,027), with new onset of MCI (defined as CDR = 0.5) in the first year and dementia (defined as CDR > or = 1) in the second and third years were subjected to statistical analysis. In distinguishing normal from MCI, except in the literate group aged 65-74 years, MMSE was superior to BDRS, with cut-off values of 1 in both literate groups aged 65-74 years and > or = 75 years, and 1.5 and 2 in less educated groups aged 65-74 and > or = 75 years, respectively. In distinguishing MCI from dementia, BDRS had cut-off values of 2.5 in both literate groups aged 65-74 and > or = 75 years, and 2.5 and 3 in less educated groups aged 65-74 and > or = 75 years, respectively. These values were better than those for MMSE in all groups. BDRS might be considered as a better tool than MMSE to screen for MCI and dementia in the increasing proportion of literate elderly aged 65-74 years in the aging population. PMID:16911919

  12. Aligning DNA on Si surface and cutting off by tips of atomic force microscope

    Institute of Scientific and Technical Information of China (English)

    2003-01-01

    DNA is a kind of promising molecule as nano-lead to build or connect nano-devices due to its stable linear structure and certain conductivity. Many methods have been applied to constructing nano-patterns by using DNA molecule. In this report it is presented that (-DNA was aligned on Si substrate by using the free-flowing method and then imaged by an atomic force microscope (AFM). After the second liquid flow, a catenary-like pattern and a crossed network of -DNA were formed. In addition, the aligned (-DNA was successfully cut off by tips of AFM.

  13. Sensitivity studies of spin cut-off models on fission fragment observables

    Directory of Open Access Journals (Sweden)

    Thulliez L.

    2016-01-01

    Full Text Available A fission fragment de-excitation code, FIFRELIN, is being developed at CEA Cadarache. It allows probing the characteristics of the prompt emitted particles, neutrons and gammas, during the de-excitation process of fully accelerated fission fragments. The knowledge of the initial states of the fragments is important to accurately reproduce the fission fragment observables. In this paper a sensitivity study of various spin cut-off models, completely defining the initial fission fragment angular momentum distribution has been performed. This study shows that the choice of the model has a significant impact on gamma observables such as spectrum and multiplicity and almost none on the neutron observables.

  14. Sensitivity studies of spin cut-off models on fission fragment observables

    Science.gov (United States)

    Thulliez, L.; Litaize, O.; Serot, O.

    2016-03-01

    A fission fragment de-excitation code, FIFRELIN, is being developed at CEA Cadarache. It allows probing the characteristics of the prompt emitted particles, neutrons and gammas, during the de-excitation process of fully accelerated fission fragments. The knowledge of the initial states of the fragments is important to accurately reproduce the fission fragment observables. In this paper a sensitivity study of various spin cut-off models, completely defining the initial fission fragment angular momentum distribution has been performed. This study shows that the choice of the model has a significant impact on gamma observables such as spectrum and multiplicity and almost none on the neutron observables.

  15. On the discovery of the Greisen–Zatzepin–Kuzmin cut-off

    Indian Academy of Sciences (India)

    Tadeusz Wibig

    2009-11-01

    The recent claim of the `5 sigma' observation of the Greisen–Zatzepin–Kuzmin cut-off by the HiRes group based on their nine years data is a significant step towards the eventual solution of one of the most intriguing questions in physics for more than 40 years. Recent results from Pierre Auger Observatory seem to confirm the statement. However, the word `significance' is used in the mentioned paper in a sense which is not quite obvious. In the present paper we argue that this claim is a little premature.

  16. Observation and calculation of trapped modes near cut-off in the ALS bellow-shield

    International Nuclear Information System (INIS)

    Observed heating of the RF shields in the bellows of the Advanced Light Source (ALS) storage ring has led to studies of possible causes. One such possibility is resonant impedances near the cut-off frequency of the beam-pipe that arise from small, localized, enlargements of the beampipe cross-section. Calculations of trapped modes in the elliptical-section vacuum chamber, approximated by a rectangular geometry, are described. Measurements of a bellows-shield in the test laboratory are also described, as are temperature measurements of a flexband in the storage ring

  17. Revisiting AdS/CFT at a finite radial cut-off

    CERN Document Server

    Mandal, Gautam

    2016-01-01

    We revisit AdS/CFT at finite radial cut-off, specifically in the context of double trace perturbations, $\\mathbb{O}_n$= $\\mathbb{O}(x) (\\partial^2)^{n} {\\mathcal O}(x)$, with arbitrary $n$. As well-known, the standard GKPW prescription, applied to a finite radial cut-off, leads to contact terms in correlators. de Haro et al \\cite{deHaro:2000vlm} introduced bulk counterterms to remove these. However, this prescription yields additional terms in the correlator corresponding to spurious double trace deformations. Further, if we view GKPW prescription coupled with the prescription in \\cite{deHaro:2000vlm}, in terms of a boundary wavefunction, we find that it is incompatible with radial Schrodinger evolution (in the spirit of holographic Wilsonian RG). We consider a more general wavefunction satisfying the Schrodinger equation, and find that generically such wavefunctions generate both (a) double trace deformations and (b) contact terms. However, we find that there exist special choices of these wavefunctions, amo...

  18. Open Skies and monitoring a fissile materials cut-off treaty

    International Nuclear Information System (INIS)

    The Treaty on Open Skies (Open Skies) is intended among other things to provide, in the words of its preamble, means ''to facilitate the monitoring of compliance with existing or future arms control agreements.'' Open Skies permits overflights of the territory of member states by aircraft equipped with an array of sensors of various types. Their types and capabilities are treaty-limited. To find useful application in monitoring a cut-off treaty Open Skies would need to be amended. The number of signatories would need to be expanded so as to provide greater geographical coverage, and restrictions on sensor-array capabilities would need to be relaxed. To facilitate the detection of impending violations of a cut-off convention by Open Skies overflights, the data base provided by parties to the former should include among other things an enumeration of existing and former fuel cycle and research facilities including those converted to other uses, their precise geographic location, and a site plan

  19. Proceedings from the Fissile Material Cut-off seminar in Stockholm

    Energy Technology Data Exchange (ETDEWEB)

    Arbman, G. [ed.

    1998-07-01

    The Swedish Defence Research Establishment hosted an international expert seminar on the subject of verifying a prohibition of the production of fissile material for nuclear weapons purpose (cut-off) in Stockholm, June 3-5 1998. The objective of the seminar was to provide an opportunity for informal discussions among scientific and technical experts on various technical matters relating to the verification of a future Fissile Material Cut-off Treaty (FMCT). A stated aim of the seminar was to keep issues of scope to a minimum. Invited speakers and commentators were given an opportunity to present their views as written contributions. The present seminar proceedings are essentially the result of these views. In addition, short summaries of the discussions following each session are included. Although an attempt was made to be as complete and accurate as possible in reproducing these discussions, the editors apologise if some important points or statements have been omitted. If so, the main reason is that the documentation of the discussions were based on written notes, not taped recordings. Eight longer contributions have been separately indexed.

  20. Cut-Off Values of Visceral Adiposity to Predict NAFLD in Brazilian Obese Adolescents

    Directory of Open Access Journals (Sweden)

    Ana Paula Grotti Clemente

    2013-01-01

    Full Text Available Objectives. The present study aimed at determining cut-off points of visceral fat to predict NAFLD and analyzed metabolic disorders of obese adolescents. Methods. Cross-sectional study involved 165 obese adolescents ranged in age from 15 to 19 years. Glycemia, hepatic transaminases, lipid profile, and insulin resistance were analyzed. Visceral and subcutaneous fat were measured by ultrasound and body composition by plesthysmography. Results. The NAFLD adolescents had significantly higher values for body mass, BMI-for-age, BMI, total fat, waist circumference, and visceral fat when compared with non-NAFLD obese adolescents in both genders. Moreover, there were significant positive correlations between visceral fat with the variables BMI-for-age (r=0.325,, TG (r=0.277, AST (r=0.509, ALT (r=0.519, WC (r=0.390, and visceral/subcutaneous ratio (r=0.790 for NAFLD group. Total fat, triglycerides, and visceral fat were the independent predictors to NAFLD. Analysis of the ROC curves revealed cut-off points of visceral fat of 4.47 cm for girls and 4.21 cm for boys. Conclusions. The results may suggest that abdominal ultrasonography procedure may be a safe alternative method of assessing visceral adiposity aiming to be considered to the development of preventive and treatment strategies in obese individuals. This clinial trial is registered with ClinicalTrial.gov (NCT01358773.

  1. The cut-off criterion for a positive hydrogen breath test in children: a reappraisal.

    Science.gov (United States)

    Solomons, N W; Barillas, C

    1986-01-01

    Seventy-three preschool children with adequate nutritional status underwent interval-sampling, 3-hour breath-hydrogen carbohydrate absorption tests after consuming either 240 ml of intact milk (containing 12 g of lactose) or the same volume of milk with 90-95% of its lactose prehydrolyzed in vitro (containing less than 1 g lactose, with the remaining sugar as glucose and galactose). Results were examined in a reappraisal of the cut-off criterion for the rise of breath H2 concentration signifying biologically incomplete absorption. If the greater than or equal to 10-ppm criterion advocated by some investigators is used, 83% of our subjects would have been classified as incomplete lactose digesters and 30% would have their tests with the monosaccharide-rich milk classified as positive. With the greater than or equal to 20 ppm criterion used in our laboratory and others, the prevalence of lactose maldigestion in the sample becomes 60% and only 4% of subjects have apparent monosaccharide absorption, 96% having a rise below the cut-off level with prehydrolyzed milk. At least in Guatemalan preschoolers, the 20-ppm criterion for a positive breath H2 test provides a superior specificity-sensitivity balance and more reasonable diagnostic conclusions. PMID:3794911

  2. Proceedings from the Fissile Material Cut-off seminar in Stockholm

    International Nuclear Information System (INIS)

    The Swedish Defence Research Establishment hosted an international expert seminar on the subject of verifying a prohibition of the production of fissile material for nuclear weapons purpose (cut-off) in Stockholm, June 3-5 1998. The objective of the seminar was to provide an opportunity for informal discussions among scientific and technical experts on various technical matters relating to the verification of a future Fissile Material Cut-off Treaty (FMCT). A stated aim of the seminar was to keep issues of scope to a minimum. Invited speakers and commentators were given an opportunity to present their views as written contributions. The present seminar proceedings are essentially the result of these views. In addition, short summaries of the discussions following each session are included. Although an attempt was made to be as complete and accurate as possible in reproducing these discussions, the editors apologise if some important points or statements have been omitted. If so, the main reason is that the documentation of the discussions were based on written notes, not taped recordings. Eight longer contributions have been separately indexed

  3. Short-range Cut-Off of the Summed-Up van der Waals Series

    Science.gov (United States)

    Patra, Abhirup; Perdew, John P.

    2015-03-01

    van der Waals interactions are important in typical van der Waals-bound systems such as noble-gas, hydrocarbon, alkali and alkaline-earth dimers. The summed-up van der Waals series works well and gives an accurate result at large separation between two atoms. But it has a strong singularity at short non-zero separation, where the two atoms touch. In this work we remove that singularity with a reasonable and physical choice of the cut-off distance. Only one fitting parameter has been introduced for the short-range cut off. The parameter in our model has been optimized for each system, and a system-averaged value has been used to get the final binding energy curves. When this correction is added to the binding energy curve from the semilocal density functional meta-GGA-MS2, we get vdW- corrected binding energy curve. These curves are compared with the results of other vdW-corrected methods such as PBE-D2 and vdW-DF2 .Binding energy curves are in reasonable agreement with those from experiment. These curves also predict reasonably good equilibrium bond length. Supported by NSF (DMR).

  4. Open Skies and monitoring a fissile materials cut-off treaty

    Energy Technology Data Exchange (ETDEWEB)

    Allentuck, J.; Lemley, J.R.

    1995-09-01

    The Treaty on Open Skies (Open Skies) is intended among other things to provide, in the words of its preamble, means ``to facilitate the monitoring of compliance with existing or future arms control agreements.`` Open Skies permits overflights of the territory of member states by aircraft equipped with an array of sensors of various types. Their types and capabilities are treaty-limited. To find useful application in monitoring a cut-off treaty Open Skies would need to be amended. The number of signatories would need to be expanded so as to provide greater geographical coverage, and restrictions on sensor-array capabilities would need to be relaxed. To facilitate the detection of impending violations of a cut-off convention by Open Skies overflights, the data base provided by parties to the former should include among other things an enumeration of existing and former fuel cycle and research facilities including those converted to other uses, their precise geographic location, and a site plan.

  5. Appropriate body mass index cut-offs to determine thinness, overweight and obesity in South Asian children in the Netherlands.

    Directory of Open Access Journals (Sweden)

    Jeroen A de Wilde

    Full Text Available BACKGROUND: Asian populations have an increased risk of developing cardiometabolic disorders at a lower body mass index (BMI than other ethnic groups. Therefore, lower adult BMI cut-offs to determine overweight and obesity are recommended to assess the associated health risks for Asian (23 and 27.5 kg/m(2 respectively and Asian Indian (23, 25 kg/m(2 populations. The objective of this study was to develop BMI cut-offs for thinness, overweight, and obesity for South Asian children in the Netherlands, and to compare the BMI cut-offs and distribution with an Asian Indian reference, the WHO Child Growth Reference, and universal BMI cut-offs. METHODS: A reference cohort of 546 Surinamese South Asian boys and 521 girls, born between 1974-1976 (during the pre-obesity era with 3408 and 3267 BMI measurements respectively, was retrospectively analysed. BMI-for-age charts were created with the LMS method. BMI centile curves passing through the cut-off points of 15 (thinness, 23 (overweight, 25 and 27.5 kg/m(2 (obesity at 18y were drawn as cut-off levels. RESULTS: The BMI of Surinamese South Asian children had a similar distribution to the Asian Indian reference, apart from a lower mean and less variation. The BMI distribution differed considerably from the WHO reference and universal BMI criteria. The calculated BMI cut-offs corresponding to a BMI of 15, 23, 25, and 27.5 kg/m(2 at 18y were at the 7.1, 81.1, 89.8, and 95.5 percentile respectively in boys, and at the 2.7, 79.5, 89.2, and 95.2 percentile in girls. CONCLUSIONS: This is the first study proposing BMI cut-offs for South Asian children based on measurements from a prosperous population unaffected by the obesity epidemic. We recommend the use of these cut-offs in South Asian children in the Netherlands as these better reflect the health risks associated with thinness, overweight and obesity, and therefore may prevent the development of cardiometabolic disorders.

  6. Distributions of the S-matrix poles in Woods-Saxon and cut-off Woods-Saxon potentials

    Science.gov (United States)

    Salamon, P.; Baran, Á.; Vertse, T.

    2016-08-01

    The positions of the l = 0S-matrix poles are calculated in generalized Woods-Saxon (GWS) potential and in cut-off generalized Woods-Saxon (CGWS) potential. The solutions of the radial equations are calculated numerically for the CGWS potential and analytically for GWS using the formalism of Gy. Bencze [1]. We calculate CGWS and GWS cases at small non-zero values of the diffuseness in order to approach the square well potential and to be able to separate effects of the radius parameter and the cut-off radius parameter. In the case of the GWS potential the wave functions are reflected at the nuclear radius therefore the distances of the resonant poles depend on the radius parameter of the potential. In CGWS potential the wave function can be reflected at larger distance where the potential is cut to zero and the derivative of the potential does not exist. The positions of most of the resonant poles do depend strongly on the cut-off radius of the potential, which is an unphysical parameter. Only the positions of the few narrow resonances in potentials with barrier are not sensitive to the cut-off distance. For the broad resonances the effect of the cut-off cannot be corrected by using a suggested analytical form of the first order perturbation correction.

  7. oA novel nonparametric approach for estimating cut-offs in continuous risk indicators with application to diabetes epidemiology

    Directory of Open Access Journals (Sweden)

    Ferger Dietmar

    2009-09-01

    Full Text Available Abstract Background Epidemiological and clinical studies, often including anthropometric measures, have established obesity as a major risk factor for the development of type 2 diabetes. Appropriate cut-off values for anthropometric parameters are necessary for prediction or decision purposes. The cut-off corresponding to the Youden-Index is often applied in epidemiology and biomedical literature for dichotomizing a continuous risk indicator. Methods Using data from a representative large multistage longitudinal epidemiological study in a primary care setting in Germany, this paper explores a novel approach for estimating optimal cut-offs of anthropomorphic parameters for predicting type 2 diabetes based on a discontinuity of a regression function in a nonparametric regression framework. Results The resulting cut-off corresponded to values obtained by the Youden Index (maximum of the sum of sensitivity and specificity, minus one, often considered the optimal cut-off in epidemiological and biomedical research. The nonparametric regression based estimator was compared to results obtained by the established methods of the Receiver Operating Characteristic plot in various simulation scenarios and based on bias and root mean square error, yielded excellent finite sample properties. Conclusion It is thus recommended that this nonparametric regression approach be considered as valuable alternative when a continuous indicator has to be dichotomized at the Youden Index for prediction or decision purposes.

  8. Dynamical behavior and cut-off frequency of Si/SiGe microcoolers

    Science.gov (United States)

    Ezzahri, Y.; Dilhaire, S.; Patiño-Lopez, L. D.; Grauby, S.; Claeys, W.; Bian, Z.; Zhang, Y.; Shakouri, A.

    2007-01-01

    Solid-state microcoolers offer an attractive way to solve some of the problems related to temperature stabilisation and control, not only in optoelectronic and microelectronic applications, but also in biological applications where specimens require cooling. One of the important parameters of these coolers is their transient response or their cut-off frequency. We studied how this parameter is influenced by material properties (e.g., substrate and superlattice layer thermal diffusivities), and by geometrical factors (e.g., microcooler cross sectional area or thickness). Our models are based on a modified Thermal Quadrupole Method, which only takes the Peltier effect into account; the reason behind the modification is that the Peltier and Joule effects are uncorrelated in the frequency domain, so their contributions can be studied separately. The thermophysical properties of the microcooler are assumed to be temperature independent. The effect of the top side heat leakage on the performance of the microcooler is also presented.

  9. Percentile curves for body fatness and cut-offs to define malnutrition in Russians

    Science.gov (United States)

    Nikolaev, D. V.; Rudnev, S. G.; Starunova, O. A.; Eryukova, T. A.; Kolesnikov, V. A.; Ponomareva, E. G.; Soboleva, N. P.; Sterlikov, S. A.

    2013-04-01

    Here, we report first results of the large-scale ongoing bioelectrical impedance body composition study in Russians. By the end of 2012, 216 out of 800 Russian Health Centres submitted raw bioimpedance data on 844,221 adults and children aged 5-80 years, representing nearly 0.6% of the Russian population, who were accessed cross-sectionally using the same type of bioimpedance meter, ABC-01 Medas. Estimates of overweight, obesity, and normal weight obesity prevalence in the general population, as well as characteristics of diagnostic sensitivity and specificity of the conventional WHO BMI-based criteria of obesity depending on age are obtained. The smoothed reference centile curves for percentage fat mass are constructed, and localized cut-offs for fatness and thinness are provided that can be used both at the individual and epidemiological levels.

  10. Percentile curves for body fatness and cut-offs to define malnutrition in Russians

    International Nuclear Information System (INIS)

    Here, we report first results of the large-scale ongoing bioelectrical impedance body composition study in Russians. By the end of 2012, 216 out of 800 Russian Health Centres submitted raw bioimpedance data on 844,221 adults and children aged 5–80 years, representing nearly 0.6% of the Russian population, who were accessed cross-sectionally using the same type of bioimpedance meter, ABC-01 Medas. Estimates of overweight, obesity, and normal weight obesity prevalence in the general population, as well as characteristics of diagnostic sensitivity and specificity of the conventional WHO BMI-based criteria of obesity depending on age are obtained. The smoothed reference centile curves for percentage fat mass are constructed, and localized cut-offs for fatness and thinness are provided that can be used both at the individual and epidemiological levels.

  11. The Association Between Epicardial Adipose Tissue and Coronary Artery Disease: an Echocardiographic Cut-off Point

    Directory of Open Access Journals (Sweden)

    Mehrnoush Toufan

    2012-09-01

    Full Text Available Introduction: EAT is an independent factor in coronary artery disease (CAD. The objective of the current study was to define an echocardiographic cut-off point for EAT and to determine its diagnostic value in predicting the increase in CAD risk. Methods: Two hundred patients underwent coronary artery angiography for diagnosis of CAD and transthoracic echocardiography for measurement of EAT on the right ventricle (RV, RV apex and RV outlet tract. Sensitivity, specificity, positive predictive value (PPV and negative predictive value (NPV of the EAT cut-off points in the three above-mentioned areas for predicting the severity of CAD were measured. The relation between the EAT and CAD risk factors was evaluated as well. Results: EAT was independent from gender, height, hypertension, diabetes, HDL, total cholesterol, ejection fraction, acute coronary syndrome, and the location of the coronary artery stenosis in the coronary artery in all three anatomical areas. EAT on RV and RV apex had a significant relation with CAD (P ≤ 0.05. Overall, RV EAT≥ 10 mm and RV apex EAT ≥ 8 mm had sensitivity and PPV of more than 70% in predicting coronary stenosis ≥ 50% and acute coronary syndrome (ACS and RVOT EAT ≥ 13 mm is of PPV=83.5% for predicting coronary stenosis ≥ 50%. Conclusion: EAT thickness has an acceptable diagnostic value for predicting severe coronary artery stenosis and ACS. Therefore, non-invasive EAT thickness measurement could be of great assistance to clinicians for detecting the patients at risk and helping them to undergo supplementary evaluations with invasive approaches.

  12. Role of neutron and proton system in spin cut off parameter and entropy of {sup 89,90}Y

    Energy Technology Data Exchange (ETDEWEB)

    Rahmatinejad, A. [Department of Physics, Faculty of Science, University of Zanjan, Zanjan (Iran, Islamic Republic of); Razavi, R., E-mail: rrazavin@ihu.ac.ir [Physics Department, Faculty of Science, Imam Hossein Comprehensive University, Tehran (Iran, Islamic Republic of); Kakavand, T. [Department of Physics, Faculty of Science, Imam Khomeini International University, Qazvin (Iran, Islamic Republic of)

    2015-09-15

    The nuclear level densities, entropies and spin cut off parameters have been determined in {sup 89,90}Y nuclei using the BCS model with inclusion of pairing interaction. The results have a good agreement with the recent experimental data on the level densities measured by the Oslo group. In addition, the entropy excess of {sup 90}Y compared to {sup 89}Y as a function of temperature has been extracted. Also, the role of neutron and proton systems in the entropy excess as well as the spin cut off excess have been investigated using the entropy excess ratio and spin cut off excess ratio introduced in our previous publication. The role of the neutron system at low temperatures, the temperatures below critical temperature, in the semi-magic nucleus {sup 89}Y is similar compared to the closed shell proton system in the tin isotopes.

  13. Fixed Cut-Off for FEV1/FEV6 and FEV6 in Detection of Obstructive and Restrictive Patterns

    OpenAIRE

    Aghili, Rokhsareh; Kia, Maryam; Meysamie, Alipasha; Aghili, Seyed Mojtaba; Paknejad, Omalbanin

    2013-01-01

    Background Chronic obstructive pulmonary diseases (COPD) have been defined by the Global Initiative for Chronic Obstructive Lung Disease (GOLD) as irreversible conditions which are diagnosed by fixed cut-off points of FEV1/FVC. Objective The aim of this study was to determine the cut-off points for FEV1/FEV6 ratio and FEV6 as alternatives for FEV1/FVC and FVC in detection of airway obstruction and lung restriction, respectively. Materials and Methods A total of 318 Spiro metric examinations o...

  14. Shear avalanches in metallic glasses under nanoindentation: Deformation units and rate dependent strain burst cut-off

    International Nuclear Information System (INIS)

    Indented metallic glasses at the nanoscale deform via strain bursts. Conventional continuum descriptions are not appropriate for such highly stochastic, intermittent deformations. In this study, after a statistical analysis of strain bursts in five metallic glasses, the dependence of the cut-off of the strain burst size on deformation units and loading rate is established. For soft metallic glasses with smaller deformation units, cut-off of the strain burst size truncates the scale-free behavior at larger strain burst sizes. For hard metallic glasses, scale-free behavior occurs in a wide range of strain burst sizes

  15. Cut-off Characterisation of Energy Spectra of Bright Fermi Sources: Current instrument limits and future possibilities

    CERN Document Server

    Romoli, C; Aharonian, F

    2016-01-01

    In this paper some of the brightest GeV sources observed by the Fermi-LAT were analysed, focusing on their spectral cut-off region. The sources chosen for this investigation were the brightest blazar flares of 3C 454.3 and 3C 279 and the Vela pulsar using catalogue data and reanalysis with the latest Fermi-LAT software. For the study the spectral cut-off we first explored the Vela pulsar spectrum, whose statistics in the 3FGL catalog allowed strong constraints to be obtained on the parameters. We subsequently performed a new analysis of the flaring blazar SEDs. For these sources we obtained constraints on the cut-off parameters under the assumption that their underlying spectral distribution is described by a power-law with a stretched exponential cut-off. We then highlighted the significant potential improvements on such constraints by observations with next generation ground based Cherenkov telescopes, represented in our study by the Cherenkov Telescope Array (CTA). Adopting currently available simulations ...

  16. Appropriate body mass index cut-offs to determine thinness, overweight and obesity in South Asian children in The Netherlands

    NARCIS (Netherlands)

    Wilde, J.A. de; Dommelen, P. van; Middelkoop, B.J.C.

    2013-01-01

    Background: Asian populations have an increased risk of developing cardiometabolic disorders at a lower body mass index (BMI) than other ethnic groups. Therefore, lower adult BMI cut-offs to determine overweight and obesity are recommended to assess the associated health risks for Asian (23 and 27.5

  17. ELISA Cut-off Point for the Diagnosis of Human Brucellosis; a Comparison with Serum Agglutination Test

    Directory of Open Access Journals (Sweden)

    Anahita Sanaei Dashti

    2012-03-01

    Full Text Available Background: Brucellosis is a world-wide disease, which has a diverse clinical manifestation, and its diagnosis has to be proven by laboratory data. Serum agglutination test (SAT is the most-widely used test for diagnosing brucellosis. The enzyme linked immunosorbent assay (ELISA can also determine specific antibody classes against brucella. It is a sensitive, simple and rapid test, which could be an acceptable alternative to SAT with fewer limitations, however, like any other new test it should be further evaluated and standardized for various populations. This study was planned to determine an optimal cut-off point, for ELISA which would offer maximum sensitivity and specificity for the test when compared to SAT.Methods: Four hundred and seven patients with fever and other compatible symptoms of brucellosis were enrolled in the study. Serum agglutination test, 2-Mercaptoethanol test, and ELISA were performed on their sera. Results: The cut-off point of 53 IU/ml of ELISA-IgG yielded the maximal sensitivity and specificity comparing to the other levels of ELISA-IgG, and was considered the best cut off-point of ELISA-IgG to diagnose acute brucellosis. At this cut-off, the sensitivity, specificity, positive predictive value, negative predictive value, positive likelihood ratio, and negative likelihood ratio were 84.09%, 85.38%, 62.20, 94.90, 5.75, 0.18, respectively.Conclusion: The best cut-off point of ELISA-IgG is 53 IU/ml, which yields the maximal sensitivity and specificity to diagnose acute brucellosis.

  18. Mechanically robust 39 GHz cut-off frequency graphene field effect transistors on flexible substrates.

    Science.gov (United States)

    Wei, Wei; Pallecchi, Emiliano; Haque, Samiul; Borini, Stefano; Avramovic, Vanessa; Centeno, Alba; Amaia, Zurutuza; Happy, Henri

    2016-08-01

    Graphene has been regarded as a promising candidate channel material for flexible devices operating at radio-frequency (RF). In this work we fabricated and fully characterized double bottom-gate graphene field effect transistors on flexible polymer substrates for high frequency applications. We report a record high as-measured current gain cut-off frequency (ft) of 39 GHz. The corresponding maximum oscillation frequency (fmax) is 13.5 GHz. These state of the art high frequency performances are stable against bending, with a typical variation of around 10%, for a bending radius of up to 12 mm. To demonstrate the reliability of our devices, we performed a fatigue stress test for RF-GFETs which were dynamically bend tested 1000 times at 1 Hz. The devices are mechanically robust, and performances are stable with typical variations of 15%. Finally we investigate thermal dissipation, which is a critical parameter for flexible electronics. We show that at the optimum polarization the normalized power dissipated by the GFETs is about 0.35 mW μm(-2) and that the substrate temperature is around 200 degree centigrade. At a higher power, irreversible degradations of the performances are observed. Our study on state of the art flexible GFETs demonstrates mechanical robustness and stability upon heating, two important elements to assess the potential of GFETs for flexible electronics. PMID:27396243

  19. Susceptibility profile and epidemiological cut-off values of Cryptococcus neoformans species complex from Argentina.

    Science.gov (United States)

    Córdoba, Susana; Isla, Maria G; Szusz, Wanda; Vivot, Walter; Altamirano, Rodrigo; Davel, Graciela

    2016-06-01

    Epidemiological cut-off values (ECVs) based on minimal inhibitory concentration (MIC) distribution have been recently proposed for some antifungal drug/Cryptococcus neoformans combinations. However, these ECVs vary according to the species studied, being serotypes and the geographical origin of strains, variables to be considered. The aims were to define the wild-type (WT) population of the C. neoformans species complex (C. neoformans) isolated from patients living in Argentina, and to propose ECVs for six antifungal drugs. A total of 707 unique C. neoformans isolates obtained from HIV patients suffering cryptococcal meningitis were studied. The MIC of amphotericin B, flucytosine, fluconazole, itraconazole, voriconazole and posaconazole was determined according to the EDef 7.2 (EUCAST) reference document. The MIC distribution, MIC50 , MIC90 and ECV for each of these drugs were calculated. The highest ECV, which included ≥95% of the WT population modelled, was observed for flucytosine and fluconazole (32 μg ml(-1) each). For amphotericin B, itraconazole, voriconazole and posaconazole, the ECVs were: 0.5, 0.5, 0.5 and 0.06 μg ml(-1) respectively. The ECVs determined in this study may aid in identifying the C. neoformans strains circulating in Argentina with decreased susceptibility to the antifungal drugs tested. PMID:26865081

  20. Higher-spin realization of a dS static patch/cut-off CFT correspondence

    CERN Document Server

    Karch, Andreas

    2013-01-01

    We derive a holographic relation for the dS static patch with the dual field theory defined on the observer horizon. The starting point is the duality of higher-spin theory on AdS_4 and the O(N) vector model. We build on a similar analytic continuation as used recently to obtain a realization of dS/CFT, and adapt it to the static patch. The resulting duality relates higher-spin theory on the dS_4 static patch to a cut-off CFT on the cylinder RxS^2. The construction permits a derivation of the finite thermodynamic entropy associated to the horizon of the static patch from the dual field theory. As a further brick we recover the spectrum of quasinormal frequencies from the correlation functions of the boundary theory. In the last part we incorporate the dS/dS correspondence as an independent proposal for holography on dS and show that a concrete realization can be obtained by similar reasoning.

  1. Detection of cut-off point for rapid automized naming test in good readers and dyslexics

    Directory of Open Access Journals (Sweden)

    Zahra Soleymani

    2014-01-01

    Full Text Available Background and Aim: Rapid automized naming test is an appropriate tool to diagnose learning disability even before teaching reading. This study aimed to detect the cut-off point of this test for good readers and dyslexics.Methods: The test has 4 parts including: objects, colors, numbers and letters. 5 items are repeated on cards randomly for 10 times. Children were asked to name items rapidly. We studied 18 dyslexic students and 18 age-matched good readers between 7 and 8 years of age at second and third grades of elementary school; they were recruited by non-randomize sampling into 2 groups: children with developmental dyslexia from learning disabilities centers with mean age of 100 months, and normal children with mean age of 107 months from general schools in Tehran. Good readers selected from the same class of dyslexics.Results: The area under the receiver operating characteristic curve was 0.849 for letter naming, 0.892 for color naming, 0.971 for number naming, 0.887 for picture naming, and 0.965 totally. The overall sensitivity and specificity was 1 and was 0.79, respectively. The highest sensitivity and specificity were related to number naming (1 and 0.90, respectively.Conclusion: Findings showed that the rapid automized naming test could diagnose good readers from dyslexics appropriately.

  2. Solute removal capacity of high cut-off membrane plasma separators.

    Science.gov (United States)

    Ohkubo, Atsushi; Kurashima, Naoki; Nakamura, Ayako; Miyamoto, Satoko; Iimori, Soichiro; Rai, Tatemitsu

    2013-10-01

    In vitro blood filtration was performed by a closed circuit using high cut-off membrane plasma separators, EVACURE EC-2A10 (EC-2A) and EVACURE EC-4A10 (EC-4A). Samples were obtained from sampling sites before the plasma separator, after each plasma separator, and from the ultrafiltrate of each separator. The sieving coefficient (S.C.) of total protein (TP), albumin (Alb), IgG, interleukin-6 (IL-6), interleukin-8 (IL-8), tumor necrosis factor-α (TNF-α), fibrinogen (Fib), antithrombin III (AT-III), and coagulation factor XIII (FXIII) were calculated. The S.C. of each solute using EC-2A and EC-A4 were as follows; TP: 0.25 and 0.56, Alb: 0.32 and 0.73, IgG: 0.16 and 0.50, IL-6:0.73 and 0.95, IL-8:0.85 and 0.82, TNF-α: 1.07 and 0.99, Fib: 0 and 0, FXIII: 0.07 and 0.17, respectively. When compared with the conventional type of membrane plasma separators, EVACURE could efficiently remove cytokines while retaining coagulation factors such as fibrinogen. Moreover, EC-2A prevented protein loss, whereas EC-4A could remove approximately 50% of IgG. PMID:24107276

  3. Dynamics of magnetostatic wave solitons in the vicinity of frequency cut-off

    International Nuclear Information System (INIS)

    Nonlinear dynamics of one-dimensional pulses of exchangeless backward volume magnetostatic waves propagating in thin ferrite films with a thickness 2l=(3-10) μm is studied numerically. The Whitham's approach of taking into account the exact wave dispersion is utilized. It has been found that in the case of small wave numbers (0.020l≤0.05), even under a validity of quasi-stationary approximation, a commonly used polynomial approximation for the wave dispersion gives only rough description for nonlinear pulse dynamics. The reason is a presence of cut-off at higher frequencies. For greater wave numbers (k0l≥0.1), the nonlinear wave dynamics coincides with results obtained earlier in the parabolic approximation for the wave dispersion. Two-dimensional dynamics of nonlinear pulses is also investigated briefly in the full dispersion approach. The collapse-like phenomena have been found there when the central wave number is chosen as k0l≥0.04

  4. Immunity status against poliomyelitis in Germany: Determination of cut-off values in International Units

    Directory of Open Access Journals (Sweden)

    Schreier Eckart

    2002-02-01

    Full Text Available Abstract Background To prevent importations of wild polioviruses into a polio free region a high level of population immunity must be kept. Standard methodology for determination of polio antibodies is a feature aimed at obtaining consistent results. An International Standard Serum for polio antibodies exists, but no protective level in International Units is defined. Methods A representative study was carried out in order to determine the serological status against poliomyelitis in Germany (n = 2564, age 18–79 years. Furthermore, sera from persons aged less than 18 years were included (n = 881. Microneutralization test has been used for determination of antibody levels. Results have been expressed in International Units. Results The results of this study indicate that the cut-off level for polio antibodies is 0.075 IU/ml for Polio 1, 0.180 IU/ml for Polio 2 and 0.080 IU/ml for Polio 3. Neutralizing antibodies against poliovirus type 1, 2 and 3 were detected in 96.2%, 96.8% and 89.6% of samples, respectively. Conclusions Overall, this seroprevalence indicates a very high level of immunity of the general population. It must be kept after the switch of immunization strategy from attenuated to inactivated vaccine in Germany.

  5. The Objective Borderline Method (OBM): A Probability-Based Model for Setting up an Objective Pass/Fail Cut-Off Score in Medical Programme Assessments

    Science.gov (United States)

    Shulruf, Boaz; Turner, Rolf; Poole, Phillippa; Wilkinson, Tim

    2013-01-01

    The decision to pass or fail a medical student is a "high stakes" one. The aim of this study is to introduce and demonstrate the feasibility and practicality of a new objective standard-setting method for determining the pass/fail cut-off score from borderline grades. Three methods for setting up pass/fail cut-off scores were compared: the…

  6. Mechanically robust 39 GHz cut-off frequency graphene field effect transistors on flexible substrates

    Science.gov (United States)

    Wei, Wei; Pallecchi, Emiliano; Haque, Samiul; Borini, Stefano; Avramovic, Vanessa; Centeno, Alba; Amaia, Zurutuza; Happy, Henri

    2016-07-01

    Graphene has been regarded as a promising candidate channel material for flexible devices operating at radio-frequency (RF). In this work we fabricated and fully characterized double bottom-gate graphene field effect transistors on flexible polymer substrates for high frequency applications. We report a record high as-measured current gain cut-off frequency (ft) of 39 GHz. The corresponding maximum oscillation frequency (fmax) is 13.5 GHz. These state of the art high frequency performances are stable against bending, with a typical variation of around 10%, for a bending radius of up to 12 mm. To demonstrate the reliability of our devices, we performed a fatigue stress test for RF-GFETs which were dynamically bend tested 1000 times at 1 Hz. The devices are mechanically robust, and performances are stable with typical variations of 15%. Finally we investigate thermal dissipation, which is a critical parameter for flexible electronics. We show that at the optimum polarization the normalized power dissipated by the GFETs is about 0.35 mW μm-2 and that the substrate temperature is around 200 degree centigrade. At a higher power, irreversible degradations of the performances are observed. Our study on state of the art flexible GFETs demonstrates mechanical robustness and stability upon heating, two important elements to assess the potential of GFETs for flexible electronics.Graphene has been regarded as a promising candidate channel material for flexible devices operating at radio-frequency (RF). In this work we fabricated and fully characterized double bottom-gate graphene field effect transistors on flexible polymer substrates for high frequency applications. We report a record high as-measured current gain cut-off frequency (ft) of 39 GHz. The corresponding maximum oscillation frequency (fmax) is 13.5 GHz. These state of the art high frequency performances are stable against bending, with a typical variation of around 10%, for a bending radius of up to 12 mm. To

  7. Interacting logarithmic entropy-corrected holographic dark energy model with different cut-offs in Brans-Dicke cosmology

    CERN Document Server

    Darabi, F

    2015-01-01

    We study the Interacting Logarithmic Entropy-Corrected Holographic Dark Energy model with different cut-offs in Brans-Dicke cosmology and obtain the equation of state and the squared of sound speed for each cut-off. The former is used to describe the accelerating or decelerating behaviour and the later is used to describe the classical stability or instability of the universe. The correspondence between the scalar field models and the logarithmic entropy-corrected holographic dark energy densities allows us to reconstruct the potentials and the dynamics of the quintessence and tachyon scalar field models in Brans-Dicke cosmology. We show that these models can describe the observed accelerated expansion of our universe with a parameter space consistent with the most recent observational data. However, it turns out that there is fine-tuning problem concerning the value of Brans-Dicke parameter $\\omega$ at early universe which casts doubt on the viability of these dark energy models.

  8. Factors in selecting serum samples for use in determining the positive/negative threshold (cut-off) in ELISA

    International Nuclear Information System (INIS)

    The threshold (cut-off) that defines whether a test result is seropositive or seronegative is calculated by testing serum samples from a subpopulation of animals that is assumed to represent the target population in all aspects. For this proposition to be true, it is essential to consider the variables in the target population that must be represented in the subpopulation. Without representation of the variables in the subpopulation, it is likely that the cut-off selected for the test will be errant and will misclassify animals as to their infection status. The purpose of this paper is to identify a few of the principal variables that need to be taken into account when selecting a subpopulation of animals for test validation. (author)

  9. Cut-Off Scores of the Children's Depression Inventory for Screening and Rating Severity in Korean Adolescents

    OpenAIRE

    Bang, Young Rong; Park, Jae Hong; Kim, Sung Hwan

    2015-01-01

    Objective The aim was to establish an optimal cut-off score of the Children's Depression Inventory (CDI) for detecting depression and rating severity in Korean adolescents. Methods A total of 468 students aged 12-16 years from 8 middle schools in Busan, Korea participated in this study. The Korean version of the CDI and Kiddie Schedule for Affective Disorders and Schizophrenia Present and Lifetime Version were used to evaluate depressive symptoms. Receiver-operating characteristics (ROC) anal...

  10. On a holographic dark energy model with a Nojiri-Odintsov cut-off in general relativity

    OpenAIRE

    Khurshudyan, M.

    2016-01-01

    In this paper we consider the models of the accelerated expanding large scale universe~(according to general relativity) containing a generalized holographic dark energy with a Nojiri - Odintsov cut - off. The second component of the darkness is assumed to be the pressureless cold dark matter according to observed symmetries of the large scale universe. Moreover, we assume specific forms of the interaction between these two components and besides the cosmographic analysis, we discuss appropri...

  11. Successful use of combined high cut-off haemodialysis and bortezomib for acute kidney injury associated with myeloma cast nephropathy.

    LENUS (Irish Health Repository)

    Ward, F

    2012-05-01

    We present the case of a 58-year old female with de novo dialysis-dependent acute kidney injury (AKI) secondary to myeloma cast nephropathy. The patient underwent extended high cut-off haemodialysis (HCO-HD), in conjunction with bortezomib-based chemotherapy, and soon became dialysis independent with normal renal function. To our knowledge, this is the first time this treatment strategy has been employed successfully in an Irish centre.

  12. Dual cut-off dc-tunable microwave low-pass filter on superconducting Nb microstrips with asymmetric nanogrooves

    OpenAIRE

    Dobrovolskiy, Oleksandr V.; Huth, Michael

    2015-01-01

    We present a dual cut-off, dc-tunable low-pass microwave filter on a superconducting Nb microstrip with uniaxial asymmetric nanogrooves. The frequency response of the device was measured in the range $300$\\,KHz to $14$\\,GHz at different temperatures, magnetic fields, and dc current values. The microwave loss is most effectively reduced when the Abrikosov vortex lattice spatially matches the underlying washboard pinning landscape. The forward transmission coefficient $S_{21}(f)$ of the microst...

  13. Reconfigurable pyramidal antenna loaded by a cut-off waveguide-application to ARNS/RNSS services

    OpenAIRE

    Hebib, Sami; Aubert, Hervé; Pascal, Olivier; Fonseca, Nelson; Ries, Lionel; Lopez, Jean-Marc

    2009-01-01

    International audience A novel reconfigurable and circularly polarized antenna topology for satellite application services, based on a pyramidal geometry, is proposed. Frequency agility is simply obtained by loading the radiating elements by Radio-Frequency switches. The ground plane of the antenna is perforated and loaded by a cut-off and open-ended waveguide. The length of this waveguide is adjusted to achieve a good trade-off between rear radiation and impedance matching. A specific app...

  14. Cut-Off Value for Pain Sensitivity Questionnaire in Predicting Surgical Success in Patients with Lumbar Disc Herniation

    Science.gov (United States)

    Azimi, Parisa; Benzel, Edward C.

    2016-01-01

    Various factors related to predict surgical success were studied; however, a standard cut-off point for the Pain Sensitivity Questionnaire (PSQ) measure has not yet been established for a favorable surgical outcome for lumbar disc herniation (LDH). This study was to find the optimal cut-off point on the PSQ to distinguish surgical success in patients with LDH. A total of 154 patients with LDH consecutively referred to our clinic were enrolled into this prospective study between February 2011 and January 2014. All participants completed the PSQ. Patients completed the Oswestry Disability Index (ODI) score before surgery, and at 2 years after surgery. Surgical success was defined as a 13-point improvement from the baseline ODI scores. The cut-off value for PSQ was determined by the receiver-operating characteristic curve (ROC). The mean age of patients was 49.3±9.6 years, and there were 80 women. The mean time for follow-up assessment was 31±5 months (range 24–35). Post-surgical success was 79.9% (n = 123) at 2 years follow up. The mean score for the total PSQ, PSQ-minor, and PSQ-moderate were 6.0 (SD = 1.6), 5.4 (SD = 1.9) and 6.5 (SD = 1.7), respectively. Total PSQ score was also significantly correlated with the total scores of the ODI. The optimal total PSQ cut-off point was determined as > 5.2 to predict surgical success in LDH patients, with 80.0% sensitivity and 75.6% specificity (AUC-0.814, 95% CI 0.703–0.926). This study showed that the PSQ could be considered a parameter for predicting surgical success in patients with LDH, and can be useful in clinical practice. PMID:27494617

  15. Sinus cut-off sign: A helpful sign in the CT diagnosis of diaphragmatic rupture associated with pleural effusion

    Energy Technology Data Exchange (ETDEWEB)

    Kaya, Seyda Ors [Pamukkale University Medical School, Department of Thoracic Surgery, Denizli (Turkey)]. E-mail: skaya@pamukkale.edu.tr; Karabulut, Nevzat [Pamukkale University Medical School, Department of Radiology, Denizli (Turkey); Yuncu, Gokhan [Pamukkale University Medical School, Department of Thoracic Surgery, Denizli (Turkey); Sevinc, Serpil [Pamukkale University Medical School, Department of Thoracic Surgery, Denizli (Turkey); Kiroglu, Yilmaz [Pamukkale University Medical School, Department of Radiology, Denizli (Turkey)

    2006-08-15

    The objective of our study was to describe the 'sinus cut-off' sign at CT in the diagnosis of diaphragmatic rupture in patients with blunt abdominal trauma complicated with pleural effusion, and evaluate its utility in an experimental model. Between January 2004 and March 2005, we observed an unusual interruption of costophrenic sinus at CT in three patients with blunt abdominal trauma accompanied with pleural effusion. This observation prompted us to evaluate the utility of this sign in an experimental model. Laparotomically, we created 2 cm diapragmatic lacerations at each hemidiaphragm in two rabbits and pushed up the abdominal viscera with omentum through the defect. To simulate hemothorax, we also injected 5-10 mL of diluted contrast material into the pleural space. Using a dual-slice helical CT scanner, limited thoracoabdominal CT examination was performed before and after injection of intrapleural contrast material. The images were analyzed for the presence of CT signs for diaphragmatic injury. The left posterior costophrenic sulcus was interrupted in all of the three patients with left pleural effusion. While it was associated with other findings of diaphragmatic injury, the 'sinus cut-off sign' was the sole finding in one patient. The sinus cut-off sign was observed on the CT scans of 100% of the rabbits with a left and right sided diaphragmatic rupture. The 'sinus cut-off sign' is useful and can increase the CT detection of acute diaphragmatic injury associated with pleural effusion.

  16. Determining the waist circumference cut off which best predicts the metabolic syndrome components in urban Africans: the SABPA study

    OpenAIRE

    Malan, Leone; Potgieter, Johannes Cornelis; Steyn, Hendrik Stefanus; J. Prinsloo; De Ridder, Johannes Hendrik

    2011-01-01

    Various studies have shown that the relationship between waist circumference (WC) and abdominal obesity is age, gender as well as ethnicity-dependent. WC criteria for Sub Saharan Africans have not been defined by the International Diabetes Federation (IDF). The aim was to determine which WC cut off best predicted Metabolic Syndrome (MetS) in a group of urban African teachers (80 males and 93 females). We determined sphygmomanometer blood pressure, WC, glucose, high density lipoprotein cholest...

  17. Influence of age and purpose for testing on the cut-off selection of serological methods in bovine neosporosis

    OpenAIRE

    Álvarez-García, Gema; Collantes-Fernández, Esther; Costas, Eduardo; Rebordosa, Xabier; Ortega-Mora, Luis

    2003-01-01

    The aim of this study was to investigate the need for different cut-off points, according to animal age and the purpose of testing, for two of the most widely used serological techniques in bovine neosporosis, IFAT and a crude antigen ELISA (Civtest®, HIPRA). Therefore, the population reference sera used were defined using a combination of multiple criteria such as epidemiological/clinical and histopathological parameters and an immunoblot test. Firstly, foetuses and breeding cattle (heifers ...

  18. Extension of the cut-off in high-harmonic generation using two delayed pulses of the same colour

    International Nuclear Information System (INIS)

    We demonstrate a novel technique for an extension of the cut-off frequency in high-harmonic generation using a shaped field, consisting of two delayed pulses, identical in all parameters except a carrier envelope phase shift of π. We obtain high harmonics up to an energy of 5.5Up + Ip, surpassing the conventional limit of 3.17Up + Ip. For high intensities approaching the threshold for barrier suppression ionization, beyond which no harmonics are generated, this mechanism acquires practical importance as a means to overcome the limit imposed by saturation. We analyse the underlying mechanism using both classical and quantum approaches, and highlight the role of the shaped field in modifying the electron trajectories in the continuum to enhance the collection of kinetic energy from the driving field. Of greatest importance are the trajectories describing electrons ionized across the first peak of the laser field which receive the enhanced kinetic energies responsible for the cut-off extension above the conventional limit. Interestingly, the most energetic trajectories do not contribute to the harmonic cut-off in the single pulse case. We conclude with a discussion of the sub-cycle structure of the emitted harmonic radiation and possible applications of the technique.

  19. Adaptive determination of cut-off frequencies for filtering the in-cylinder pressure in diesel engines combustion analysis

    International Nuclear Information System (INIS)

    In-cylinder pressure analysis is a key tool for engine research and diagnosis and it has been object of study from the beginning of the internal combustion engines. One of its most useful application is combustion analysis on the basis of the First Law of Thermodynamics. However, heat release law calculations use the in-cylinder pressure derivative signal. Hence, the noise is increased and pressure filtering becomes necessary to remove high frequency noise, thus allowing for accurate combustion analyses. In this work, a methodology to set the cut-off frequency of a low-pass filter is proposed. Statistical criteria are used to separate the signal from the noise through the calculation of the Discrete Fourier Transform of several consecutive in-cylinder pressures cycles. Thus, only physically meaningful information is preserved. The proposed methodology is compared with some adaptive and non-adaptive algorithms used to select the cut-off frequencies, and it shows a good ability to adapt to different engine operating conditions. - Highlights: →Combustion analysis is performed by means of in-cylinder pressure measurement. →Filtering is necessary due to high noise and dispersion in the measurement. →A proposed methodology to select cut-off frequencies is proposed. →The methodology is compared with other filters, showing a better behaviour.

  20. Power-Law Entropy-Corrected Holographic Dark Energy in Ho\\v{r}ava-Lifshitz Cosmology with Granda-Oliveros Cut-off

    OpenAIRE

    Pasqua, Antonio(Department of Physics, University of Trieste, Via Valerio, No. 2, 34127 Trieste, Italy); Chattopadhyay, Surajit; Myrzakulov, Ratbay

    2015-01-01

    In this paper, we study the Power Law Entropy Corrected Holographic Dark Energy (PLECHDE) model in the framework of a non-flat Universe and of Ho\\v{r}ava-Lifshitz cosmology with infrared cut-off given by recently proposed Granda-Oliveros cut-off, which contains one term proportional to the Hubble parameter squared $H^2$ and one term proportional to the first time derivative of the Hubble parameter $\\dot{H}$. Moreover, this cut-off is characterized by two constant parameters, $\\alpha$ and $\\be...

  1. Power-law and Logarithmic Entropy Corrected Holographic Dark Energy Models in Brans-Dicke Cosmology with Granda-Oliveros Cut-Off

    OpenAIRE

    Pasqua, Antonio(Department of Physics, University of Trieste, Via Valerio, No. 2, 34127 Trieste, Italy); Chattopadhyay, Surajit; Myrzakulov, Ratbay

    2015-01-01

    In this paper, the cosmological implications of the Power Law Entropy Corrected Holographic Dark Energy (PLECHDE) and the Logarithmic Entropy Corrected Holographic Dark Energy (LECHDE) models in the context of Brans-Dicke (BD) cosmology for both non-interacting and interacting DE and Dark Matter (DM) are studied. As the system infrared cut-off, we choose the recently proposed Granda-Oliveros cut-off, which contains a term proportional to the first time derivative of the Hubble parameter and o...

  2. Optimal Cut-Off Points on the Health Anxiety Inventory, Illness Attitude Scales and Whiteley Index to Identify Severe Health Anxiety

    OpenAIRE

    Erik Hedman; Mats Lekander; Brjánn Ljótsson; Nils Lindefors; Christian Rück; Gerhard Andersson; Erik Andersson

    2015-01-01

    Background Health anxiety can be viewed as a dimensional phenomenon where severe health anxiety in form of DSM-IV hypochondriasis represents a cut-off where the health anxiety becomes clinically significant. Three of the most reliable and used self-report measures of health anxiety are the Health Anxiety Inventory (HAI), the Illness Attitude Scales (IAS) and the Whiteley Index (WI). Identifying the optimal cut-offs for classification of presence of a diagnosis of severe health anxiety on thes...

  3. Interpretation of increments in serial tumour biomarker concentrations depends on the distance of the baseline concentration from the cut-off

    DEFF Research Database (Denmark)

    Petersen, Per Hyltoft; Söletormos, Georg; Frejstrup Pedersen, Merete;

    2011-01-01

    In the management of breast cancer, several algorithms for interpretation of measured concentrations during monitoring have been introduced, without objective evaluation of their performance regarding the distance of the starting concentration from the cut-off concentration.......In the management of breast cancer, several algorithms for interpretation of measured concentrations during monitoring have been introduced, without objective evaluation of their performance regarding the distance of the starting concentration from the cut-off concentration....

  4. The assessment of anorexia in patients with cancer: cut-off values for the FAACT–A/CS and the VAS for appetite

    OpenAIRE

    Blauwhoff-Buskermolen, S.; Ruijgrok, C.; Ostelo, R. W.; de Vet, H. C. W.; Verheul, H.M.W.; de van der Schueren, M. A. E.; Langius, J. A. E.

    2015-01-01

    Purpose Anorexia is a frequently observed symptom in patients with cancer and is associated with limited food intake and decreased quality of life. Diagnostic instruments such as the Anorexia/Cachexia Subscale (A/CS) of the Functional Assessment of Anorexia/Cachexia Therapy (FAACT) questionnaire and the visual analog scale (VAS) for appetite have been recommended in the assessment of anorexia, but validated cut-off values are lacking. This study aimed to obtain cut-off values of these instrum...

  5. The entropy functional measure on trajectories of a Markov diffusion process and its estimation by the process' cut off applying the impulse control

    CERN Document Server

    Lerner, Vladimir S

    2012-01-01

    The paper extends conventional Shannon entropy' measure of a random state on an integral information measure of the Markov diffusion process on its trajectories- solutions of Ito's controllable stochastic equation. The introduced method of cutting off the process by applying an impulse control estimates the cut off information, accumulated by the process' inner connections between its states. It has shown that such a functional information measure contains more information than the sum of Shannon's entropies counted for all process' separated states.

  6. Determination of the optimal cut-off point for ELISA test for diagnosis of brucellosis in Iran

    Directory of Open Access Journals (Sweden)

    Soudbakhsh A

    2009-09-01

    Full Text Available "n Normal 0 false false false EN-US X-NONE AR-SA MicrosoftInternetExplorer4 /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin:0in; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:11.0pt; font-family:"Calibri","sans-serif"; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-fareast-font-family:"Times New Roman"; mso-fareast-theme-font:minor-fareast; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin; mso-bidi-font-family:Arial; mso-bidi-theme-font:minor-bidi;} Background: Finding a reliable diagnostic method for brucellosis is the most challengeable problem. In this study we determined the optimal diagnostic cut-off point for ELISA test."n"nMethods: We gathered 56 confirmed cases of brucellosis. Furthermore blood samples from 126 controls including 73 healthy controls and 53 without brucellosis febrile patients were collected. In all of the cases and controls ELISA Ig G and ELISA Ig M levels were measured and compared with each other by Box plot graph and the Receiver Operating Characteristic (ROC curve. The sensitivity and specificity of ELISA Ig G and Ig M were fixed in different cut-off values and Ig G and Ig M levels yielding maximal sensitivity plus specificity were selected for determination of optimal cut-off point."n"nResults: The nineteen patients had positive blood cultures for Brucella melitensis. The standard agglutination test results were 1/160 or more in 54 patients. The Box plot graph indicated a high degree of dispersion for Ig G and Ig M data in patients with brucellosis compared with febrile patients without brucellosis and healthy controls. We observed partial overlap for Ig M data (not for Ig G between cases and controls. The area under ROC curve for

  7. An optimal cut-off point for the calving interval may be used as an indicator of bovine abortions.

    Science.gov (United States)

    Bronner, Anne; Morignat, Eric; Gay, Emilie; Calavas, Didier

    2015-10-01

    The bovine abortion surveillance system in France aims to detect as early as possible any resurgence of bovine brucellosis, a disease of which the country has been declared free since 2005. It relies on the mandatory notification and testing of each aborting cow, but under-reporting is high. This research uses a new and simple approach which considers the calving interval (CI) as a "diagnostic test" to determine optimal cut-off point c and estimate diagnostic performance of the CI to identify aborting cows, and herds with multiple abortions (i.e. three or more aborting cows per calving season). The period between two artificial inseminations (AI) was considered as a "gold standard". During the 2006-2010 calving seasons, the mean optimal CI cut-off point for identifying aborting cows was 691 days for dairy cows and 703 days for beef cows. Depending on the calving season, production type and scale at which c was computed (individual or herd), the average sensitivity of the CI varied from 42.6% to 64.4%; its average specificity from 96.7% to 99.7%; its average positive predictive value from 27.6% to 65.4%; and its average negative predictive value from 98.7% to 99.8%. When applied to the French bovine population as a whole, this indicator identified 2-3% of cows suspected to have aborted, and 10-15% of herds suspected of multiple abortions. The optimal cut-off point and CI performance were consistent over calving seasons. By applying an optimal CI cut-off point to the cattle demographics database, it becomes possible to identify herds with multiple abortions, carry out retrospective investigations to find the cause of these abortions and monitor a posteriori compliance of farmers with their obligation to report abortions for brucellosis surveillance needs. Therefore, the CI could be used as an indicator of abortions to help improve the current mandatory notification surveillance system. PMID:26318526

  8. The use of vertical cut-off rigidities in computations of cosmic ray spectra on the Earth's orbits

    International Nuclear Information System (INIS)

    Simplified assumptions for computing spectral probabilities of cosmic rays transmission into the geomagnetic field are used to estimate their flux and energy spectra on low altitude orbits. For this purpose, three types of planetary tables of vertical cut-off rigidities and two approaches are used for their extrapolations from the Earth's surface to the altitude of satellite. A comparison of the results leads to errors insignificant in estimation of the radiation exposure by cosmic rays influenced by the geomagnetic field at low altitudes. (author)

  9. The Cut-Off Values of Anthropometric Indices for Identifying Subjects at Risk for Metabolic Syndrome in Iranian Elderly Men

    OpenAIRE

    Mojgan Gharipour; Masoumeh Sadeghi; Minoo Dianatkhah; Shirin Bidmeshgi; Alireza Ahmadi; Marzieh Tahri; Nizal Sarrafzadegan

    2014-01-01

    Aim. This study aimed to investigate which anthropometric indices could be a better predictor of metabolic syndrome (MetS) and the cut-off points for these surrogates to appropriately differentiate MetS in the Iranian elderly. Method. The present cross-sectional study was conducted on a sample of Isfahan Healthy Heart Program (IHHP). MetS was defined according to Third Adult Treatment Panel (ATPIII). In total, 206 elderly subjects with MetS criteria were selected. Anthropometric indices were ...

  10. Determination of the accuracy and optimal cut-off point for ELISA test in diagnosis of human brucellosis in Iran.

    Directory of Open Access Journals (Sweden)

    Mehrdad Hasibi

    2013-10-01

    Full Text Available In endemic area the most challenging problem for brucellosis is to find a reliable diagnostic method. In this case-control study, we investigated the accuracy of ELISA test for diagnosis of human brucellosis and determined the optimal cut-off value for ELISA results in Iran. The laboratory diagnosis of brucellosis was performed by blood isolation of Brucella organism with a BACTEC 9240 system and/or detection of Brucella antibodies by standard agglutination test (titer ≥ 1:160. Serum level of ELISA IgG and ELISA IgM from 56 confirmed cases of brucellosis and 126 controls were compared with each other by Box plot graph and Receiver Operating Characteristic (ROC curve. Box plot graphs showed the high degree of dispersion for IgG and IgM data in patients compared with all controls. We observed partially overlapping for IgM data (not for IgG between cases and controls in graphs. The area under ROC curve for distinguishing between cases and controls was larger for IgG compared to IgM. Based on results of this study, ELISA IgG test was more reliable than ELISA IgM test in diagnosis of human brucellosis in Iran. Using a cut-off of 10 IU/ml and 50 IU/ml had most sensitivity (92.9% and most specificity (100% for ELISA IgG test, respectively.

  11. Analysis of the acoustic cut-off frequency and HIPs in six Kepler stars with stochastically excited pulsations

    CERN Document Server

    Jimenez, A; Hernandez, F Perez; Mathur, S

    2015-01-01

    Gravito-acoustic modes in the Sun and other stars propagate in resonant cavities with a frequency below a given limit known as the cut-off frequency. At higher frequencies, waves are no longer trapped in the stellar interior and become traveller waves. In this article we study six pulsating solar-like stars at different evolutionary stages observed by the NASA Kepler mission. These high signal-to-noise targets show a peak structure that extends at very high frequencies and are good candidates for studying the transition region between the modes and the interference peaks or pseudo-modes. Following the same methodology successfully applied on Sun-as-a-star measurements, we uncover the existence of pseudo-modes in these stars with one or two dominant interference patterns depending on the evolutionary stage of the star. We also infer their cut-off frequency as the midpoint between the last eigenmode and the first peak of the interference patterns. By using ray theory we show that, while the period of one of the...

  12. Cut-off scaling of high-harmonic generation driven by a femtosecond visible optical parametric amplifier

    International Nuclear Information System (INIS)

    We studied high-harmonic generation (HHG) in Ar, Ne and He gas jets using a broadly tunable, high-energy optical parametric amplifier (OPA) in the visible wavelength range. We optimized the noncollinear OPA to deliver tunable, femtosecond pulses with 200-500 µJ energy at the 1 kHz repetition rate with excellent spatiotemporal properties, suitable for HHG experiments. By tuning the central wavelength of the OPA while keeping other parameters (energy, duration and beam size) constant, we experimentally studied the scaling law of cut-off energy with the driver wavelength in helium. Our measurements show a λ1.7+0.2 dependence of the HHG cut-off photon energy over the full visible range in agreement with previous experiments of near- and mid-IR wavelengths. By tuning the central wavelength of the driver source, the high-order harmonic spectra in the extreme ultraviolet cover the full range of photon energy between ∼25 and ∼100 eV. Due to the high coherence intrinsic in HHG, as well as the broad and continuous tunability in the extreme UV range, a high energy, high repetition rate version of this source might be an ideal seed for free electron lasers.

  13. Dynamic Changes, Cut-Off Points, Sensitivity, and Specificity of Laboratory Data to Differentiate Macrophage Activation Syndrome from Active Disease

    Directory of Open Access Journals (Sweden)

    Raheleh Assari

    2015-01-01

    Full Text Available Purpose. To compare the laboratory data and changes in these data between patients with MAS and patients with flare-up of the autoimmune diseases. Methods. In a prospective study, the static laboratory data and dynamic changes in the selected data in 17 consecutive patients with MAS and 53 patients with active disease of SJIA, PJIA, Kawasaki disease, and SLE were compared. The ROC curve analysis was used to evaluate cut-off points, sensitivity, and specificity of the static and dynamic laboratory data to differentiate between MAS and active disease. Results. In the MAS group, the mean CRP3, ALT, AST, total bilirubin, ferritin, LDH, PT, PTT, and INR were significantly higher and the mean WBC2, PMN2, Lymph2, Hgb1, 2, 3, ESR2, serum albumin, and sodium were significantly lower than in control group. Some of the important cut-off points were PLT2 38.5, ALT > 38, WBC 5277 ng/mL. Conclusion. The dynamic changes in some laboratory data, especially PLT, can differentiate between MAS and active disease. The changes in WBC, PMN, and ESR and the levels of the liver enzymes may also be helpful in the early differentiation. Very high levels of ferritin may also help the diagnosis along with other clinical and laboratory signs.

  14. STS-114: Engine Cut-Off Sensors Are a No-Go: Teaching Notes for NASA Case Study

    Science.gov (United States)

    Ransom, Khadijah S.; Johnson, Grace K.

    2013-01-01

    This case study format is intended to simulate the experience of facing the same difficult challenges and making the same critical decisions as managers, engineers, and scientists in the Space Shuttle Program. It has been designed for use in the classroom setting to help students develop skills related to decision-making. Students will read about the engine cut-off sensor anomaly which created challenges during the STS-114 mission and have the opportunity to make decisions as lead NASA engineers and Mission Management Team members. Included within this document are three case study presentation options - class discussion, group activity, and open-ended research. Please read the full case prior to in-class presentation to allow ample time for students' analysis and reflection, as well as to prepare additional questions. activities or exercises, material selection, etc. Depending upon the setting of your presentation and the number of participants, please choose at least one presentation format beforehand and plan accordingly. You may expect the following learning objectives by using the proposed formats. Learning Objectives: To enable students to experience the responsibilities of NASA management, engineers, and analysis; to discover possible procedures for investigating system anomalies; to become familiar with the liquid hydrogen low level engine cut-off sensor, including its function, connecting components, and location within the Space Shuttle; and to encourage critical analysis and stimulating discussion of Space Shuttle mission challenges.

  15. Accuracy of cut-off value by measurement of third molar index: Study of a Colombian sample.

    Science.gov (United States)

    De Luca, Stefano; Aguilar, Lina; Rivera, Marcela; Palacio, Luz Andrea Velandia; Riccomi, Giulia; Bestetti, Fiorella; Cameriere, Roberto

    2016-04-01

    The aim of this cross-sectional study was to test the accuracy of cut-off value of 0.08 by measurement of third molar index (I3M) in assessing legal adult age of 18 years in a sample of Colombian children and young adults. Digital orthopantomographs of 288 Colombian children and young adults (163 girls and 125 boys), aged between 13 and 22 years, were analysed. Concordance correlation coefficient (ρc) and κ statistics (Cohen's Kappa coefficient) showed that repeatability and reproducibility are high for both intra- and inter-observer error. κ statistics for intra- and inter-observer agreement in decision on adult or minor was 0.913 and 0.877, respectively. Age distribution gradually decreases as I3M increases in both girls and boys. For girls, the sensitivity test was 95.1% (95% CI 87.1%-95%) and specificity was 93.8% (95% CI 87.1%-98.8%). The proportion of correctly classified individuals was 95.1%. For boys, the sensitivity test was 91.7% (95% CI 85.1%-96.8%) and specificity was 90.6% (95% CI 82.1%-97.8%). The proportion of correctly classified individuals was 89.7%. The cut-off value of 0.08 is highly useful to determine if a subject is 18 years of age or older or not. PMID:26898677

  16. CFT dual of the AdS Dirichlet problem : Fluid/Gravity on cut-off surfaces

    CERN Document Server

    Brattan, Daniel K; Loganayagam, R; Rangamani, Mukund

    2011-01-01

    We study the gravitational Dirichlet problem in AdS spacetimes with a view to understanding the boundary CFT interpretation. We define the problem as bulk Einstein's equations with Dirichlet boundary conditions on fixed timelike cut-off hypersurface. Using the fluid/gravity correspondence, we argue that one can determine non-linear solutions to this problem in the long wavelength regime. On the boundary we find a conformal fluid with Dirichlet constitutive relations, viz., the fluid propagates on a `dynamical' background metric which depends on the local fluid velocities and temperature. This boundary fluid can be re-expressed as an emergent hypersurface fluid which is non-conformal but has the same value of the shear viscosity as the boundary fluid. The hypersurface dynamics arises as a collective effect, wherein effects of the background are transmuted into the fluid degrees of freedom. Furthermore, we demonstrate that this collective fluid is forced to be non-relativistic below a critical cut-off radius in...

  17. On a holographic dark energy model with a Nojiri-Odintsov cut-off in general relativity

    CERN Document Server

    Khurshudyan, M

    2016-01-01

    In this paper we consider the models of the accelerated expanding large scale universe~(according to general relativity) containing a generalized holographic dark energy with a Nojiri - Odintsov cut - off. The second component of the darkness is assumed to be the pressureless cold dark matter according to observed symmetries of the large scale universe. Moreover, we assume specific forms of the interaction between these two components and besides the cosmographic analysis, we discuss appropriate results from $Om$ and $Om3$ analysis and organize a closer look to the models via the statefinder hierarchy analysis, too. In this way we study mainly impact of the interaction on the dynamics of the background of our universe~(within specific forms of interaction). To complete the cosmographic analysis, the present day values of the statefinder parameters $(r,s)$ and $(\\omega^{\\prime}_{de}, \\omega_{de})$ has been estimated for all cases and the validity of the generalized second law of thermodynamics is demonstrated....

  18. Prevalence and cut-off point of vitamin D deficiency among secondary students of Arak, Iran in 2010

    Directory of Open Access Journals (Sweden)

    Afsaneh Talaei

    2012-01-01

    Full Text Available Introduction: Vitamin D has a basic role in bone growth and metabolism and has been noticed for its important role in many diseases, such as diabetes, depression, hypertension, and cardiovascular disease. Regarding some studies, detection of vitamin D deficiency in different places has important implication for health. This study determined prevalence of vitamin D deficiency in Arak, a centrally located city in Iran. Materials and Methods: Based upon a cross-sectional study in 2010, 420 students 10--16 years old including 220 girls and 200 boys, studied at Arak secondary schools, were selected by a multistage sampling. The level of 25 (OH D and PTH (parathormone was measured and also the prevalence of vitamin D deficiency in different intensities was evaluated and compared between girls and boys by the Student t-test. Vitamin D deficiency for the students was categorized into three intensities based on three levels of 25 (OH D: mild deficiency - 15 ≤ 25 (OH D < 20 ng/ml, moderate deficiency -- 8 ≤ 25 (OH < 15 ng/ml, severe deficiency - 25 (OH <8 ng/ml. The relationship between the 25 (OH D and PTH was assessed by Scatter chart to define cut-off points for vitamin D deficiency. Results: Based on 25 (OH D < 20 ng/ml, 84% of the students had vitamin D deficiency including 60.7% mild, 22.4% moderate, and 0.7% severe. Three local cut-off points including 13, 21, and 33 ng/ml were defined in the Scatter chart. The results showed that the deficiency of vitamin D in girls is much more than that in boys (P = 0.05. Conclusion: The high prevalence of vitamin D deficiency could be probably a result of different etiologies. We recommended that people should be encouraged to take vitamin D and calcium supplements and also they should have more exposure to the sunlight.

  19. Age-dependent D-dimer cut-off to avoid unnecessary CT-exams for ruling-out pulmonary embolism

    International Nuclear Information System (INIS)

    To evaluate the effect of an age-dependent D-Dimer cut-off in patients who underwent a computed tomography pulmonary angiogram (CTPA) for suspected pulmonary embolism (PE). Retrospective application of an age-dependent D-dimer cut-off (age/100 in patients aged over 50) in 530 consecutive patients, both in- and outpatients, aged over 18, who underwent CTPA for suspected PE according to the guidelines. The application of an age-dependent D-dimer cut-off showed a now negative test-result in 17 of 530 patients (3.2 %). The proportion was 4.1 % (17 of 418) in patients aged over 50. None of these 17 cases was diagnosed with PE in CTPA, the false-negative rate was 0 %. The effect could be seen in outpatients (14 of 377 [3.7 %]) as well as in inpatients(3 of 153 [2.0 %]) with no statistically significant difference (p > 0.05). The application of an age-dependent D-dimer cut-off as part of the guideline-based algorithm for suspected PE reduced the number of necessary CTPA in outpatients as well as in inpatients.

  20. Optimal Waist Circumference Cut-off values for Identifying Metabolic Risk Factors in Middle-aged and Elderly Subjects in Shandong Province of China

    Institute of Scientific and Technical Information of China (English)

    HOU Xin Guo; ZHANG Xiu Ping; JIANG Mei; WANG Wei Qing; NING Guang; ZHENG Hui Zhen; MA Ai Xia; SUN Yu; SONG Jun; LIN Peng; LIANG Kai; WANG Chuan; LIU Fu Qiang; LI Wen Juan; XIAO Juan; GONG Lei; WANG Mei Jian; LIU Ji Dong; YAN Fei; YANG Jun Peng; WANG Ling Shu; TIAN Meng; MA Ze Qiang; ZHAO Ru Xing; JIANG Ling; CHEN Li; YANG Wei Fang; WANG Ji Xiang; LI Cheng Qiao; WANG Yu Lian; LIU Shu Min; Hu Xiu Ping

    2014-01-01

    Objective To study the optimal waist circumference (WC) cut-off values for identifying metabolic risk factors in middle-aged and elderly subjects in Shandong Province of China. Methods A total of 2 873 men and 5 559 women were included in this cross-sectional study. Metabolic syndrome (MetS) was diagnosed according to the definition of Chinese Diabetes Society in 2004. The relation between WC and MetS was analyzed by multivariate logistic regression analysis. The optimal WC cut-off values were identified using the area under the ROC curve and the different diagnostic criteria for central obesity were compared. Results The WC was the risk factor for MetS independent of BMI, blood glucose, blood lipid, and blood pressure. The optimal WC cut-off value was 83.8 cm and 91.1 cm for identifying MetS in women and men, respectively. Compared with 80 cm and 85 cm for women and men, 85 cm and 90 cm had a higher Youden index for identifying all metabolic risk factors and MetS in women and men. Conclusion The appropriate WC cut-off value is 85 cm and 90 cm for identifying central obesity and MetS in women and men in Shandong Province of China.

  1. Detection of relevant colonic neoplasms with PET/CT: promising accuracy with minimal CT dose and a standardised PET cut-off

    Energy Technology Data Exchange (ETDEWEB)

    Luboldt, Wolfgang [Multiorgan Screening Foundation, Frankfurt (Germany); University Hospital Frankfurt, Department of Radiology, Frankfurt am Main (Germany); University Hospital Dresden, Clinic and Policlinic of Nuclear Medicine, Dresden (Germany); Volker, Teresa; Zoephel, Klaus; Kotzerke, Joerg [University Hospital Dresden, Clinic and Policlinic of Nuclear Medicine, Dresden (Germany); Wiedemann, Baerbel [University Hospital Dresden, Institute of Medical Informatics and Biometrics, Dresden (Germany); Wehrmann, Ursula [University Hospital Dresden, Clinic and Policlinic of Surgery, Dresden (Germany); Koch, Arne; Abolmaali, Nasreddin [University Hospital Dresden, Oncoray, Dresden (Germany); Toussaint, Todd; Luboldt, Hans-Joachim [Multiorgan Screening Foundation, Frankfurt (Germany); Middendorp, Markus; Gruenwald, Frank [University Hospital Frankfurt, Department of Nuclear Medicine, Frankfurt (Germany); Aust, Daniela [University Hospital Dresden, Department of Pathology, Dresden (Germany); Vogl, Thomas J. [University Hospital Frankfurt, Department of Radiology, Frankfurt am Main (Germany)

    2010-09-15

    To determine the performance of FDG-PET/CT in the detection of relevant colorectal neoplasms (adenomas {>=}10 mm, with high-grade dysplasia, cancer) in relation to CT dose and contrast administration and to find a PET cut-off. 84 patients, who underwent PET/CT and colonoscopy (n=79)/sigmoidoscopy (n=5) for (79 x 6+5 x 2)=484 colonic segments, were included in a retrospective study. The accuracy of low-dose PET/CT in detecting mass-positive segments was evaluated by ROC analysis by two blinded independent reviewers relative to contrast-enhanced PET/CT. On a per-lesion basis characteristic PET values were tested as cut-offs. Low-dose PET/CT and contrast-enhanced PET/CT provide similar accuracies (area under the curve for the average ROC ratings 0.925 vs. 0.929, respectively). PET demonstrated all carcinomas (n=23) and 83% (30/36) of relevant adenomas. In all carcinomas and adenomas with high-grade dysplasia (n=10) the SUV{sub max} was {>=}5. This cut-off resulted in a better per-segment sensitivity and negative predictive value (NPV) than the average PET/CT reviews (sensitivity: 89% vs. 82%; NPV: 99% vs. 98%). All other tested cut-offs were inferior to the SUV{sub max}. FDG-PET/CT provides promising accuracy for colorectal mass detection. Low dose and lack of iodine contrast in the CT component do not impact the accuracy. The PET cut-off SUV{sub max}{>=} 5 improves the accuracy. (orig.)

  2. Optimal Waist Circumference Cut-Off Point for Multiple Risk Factor Aggregation: Results from the Maracaibo City Metabolic Syndrome Prevalence Study

    Directory of Open Access Journals (Sweden)

    Valmore Bermúdez

    2014-01-01

    Full Text Available Context and Objective. The purpose of this study was to determine optimal waist circumference (WC cut-off values for the detection of multiple risk factor aggregation in individuals from Maracaibo, Venezuela. Participants and Methods. A total of 1,902 adult individuals of both genders belonging to MMSPS were included. Complete physical, laboratory, and anthropometric examination were done to evaluate Metabolic Syndrome (MS components and insulin resistance. ROC curves were plotted for risk factor aggregation in order to assess WC cut-off point. Logistic regression models were constructed to assess risk factors associated with the WC. Results. There were 52.2% females and 47.8% males, with WC of 90.7±13.7 cm and 98.2±15.9 cm, respectively. ROC curves exhibited a WC cut-off point for women of 90.25 cm (68.4% sensitivity, 65.8% specificity and 95.15 cm (71.1% sensitivity, 67.4% specificity for men. HOMA2-IR and high blood pressure were associated with a WC over these cut-off points, as well as 2.5-fold risk increase for multiple risk factor aggregation (OR 2.56; CI 95%: 2.05–3.20; P<0.01. Conclusions. These population-specific WC cut-offs are readily applicable tools for detection of risk factor aggregation. Insulin resistance is closely associated with this definition of abdominal obesity, which may serve as a surrogate for its assessment.

  3. On a holographic dark energy model with a Nojiri-Odintsov cut-off in general relativity

    Science.gov (United States)

    Khurshudyan, Martiros

    2016-07-01

    In this paper we consider the models of the accelerated expanding large scale universe (according to general relativity) containing a generalized holographic dark energy with a Nojiri-Odintsov cut-off. The second component of the darkness is assumed to be the pressureless cold dark matter according to observed symmetries of the large scale universe. Moreover, we assume specific forms of the interaction between these two components and besides the cosmographic analysis, we discuss appropriate results from Om and Om3 analysis and organize a closer look to the models via the statefinder hierarchy analysis, too. In this way we study mainly impact of the interaction on the dynamics of the background of our universe (within specific forms of interaction). To complete the cosmographic analysis, the present day values of the statefinder parameters (r,s) and (ω^'_{de}, ω_{de}) has been estimated for all cases and the validity of the generalized second law of thermodynamics is demonstrated. Our study showed that theoretical results from considered phenomenological models are consistent with the available observational data and symmetries.

  4. Collector optimization for tradeoff between breakdown voltage and cut-off frequency in SiGe HBT

    International Nuclear Information System (INIS)

    As is well known, there exists a tradeoff between the breakdown voltage BVCEO and the cut-off frequency fT for a standard heterojunction bipolar transistor (HBT). In this paper, this tradeoff is alleviated by collector doping engineering in the SiGe HBT by utilizing a novel composite of P+ and N− doping layers inside the collector-base (CB) space-charge region (SCR). Compared with the single N-type collector, the introduction of the thin P+ layers provides a reverse electric field weakening the electric field near the CB metallurgical junction without changing the field direction, and the thin N− layer further effectively lowers the electric field near the CB metallurgical junction. As a result, the electron temperature near the CB metallurgical junction is lowered, consequently suppressing the impact ionization, thus BVCEO is improved with a slight degradation in fT. The results show that the product of fT × BVCEO is improved from 309.51 GHz·V to 326.35 GHz·V. (electromagnetism, optics, acoustics, heat transfer, classical mechanics, and fluid dynamics)

  5. Antimicrobial susceptibility testing of Clostridium difficile using EUCAST epidemiological cut-off values and disk diffusion correlates.

    Science.gov (United States)

    Erikstrup, L T; Danielsen, T K L; Hall, V; Olsen, K E P; Kristensen, B; Kahlmeter, G; Fuursted, K; Justesen, U S

    2012-08-01

    With the emergence of reduced susceptibility of Clostridium difficile to metronidazole and vancomycin the value of antimicrobial susceptibility testing has increased. The aim of our study was to evaluate disk diffusion for susceptibility testing of C. difficile by comparing disk diffusion results with MICs from gradient tests and to propose zone diameter breakpoint correlates for the EUCAST epidemiological cut-off values (ECOFFs) recently published. We tested 211 clinical isolates of C. difficile, from patients with diarrhoea hospitalized at Aarhus and Odense University Hospitals, Denmark. Furthermore, ten clinical isolates of C. difficile from the Anaerobe Reference Laboratory, University Hospital of Wales, with known reduced susceptibility to either metronidazole or vancomycin, were included. Isolates were tested with Etest gradient strips and disk diffusion towards metronidazole, vancomycin and moxifloxacin on Brucella Blood Agar supplemented with hemin and vitamin K. We found an excellent agreement between inhibition zone diameter and MICs. For each MIC value, the inhibition zones varied from 0 to 8 mm, with 93% of values within 6 mm for metronidazole, 95% of values within 4 mm for vancomycin, and 98% of values within 4 mm for moxifloxacin. With proposed zone diameter breakpoints for metronidazole, vancomycin and moxifloxacin of WT ≥ 23 mm, WT ≥ 19 and WT ≥ 20 mm, respectively, we found no very major errors and only major errors below 2%. In conclusion, we suggest that disk diffusion is an option for antimicrobial susceptibility testing of C. difficile. PMID:22672504

  6. High-speed video of competing and cut-off leaders prior to "upward illumination-type" lightning ground strokes

    Science.gov (United States)

    Stolzenburg, Maribeth; Marshall, Thomas; Karunarathne, Sumedhe; Karunarathna, Nadeeka; Warner, Tom; Orville, Richard

    2013-04-01

    This study presents evidence to test a hypothesis regarding the physical mechanism resulting in very weak "upward illumination" (UI) type ground strokes occurring within a few milliseconds after a normal return stroke (RS) of a negative lightning flash. As described in previous work [Stolzenburg et al., JGR D15203, 2012], these short duration (strokes form a new ground connection, without apparent connection to the main RS, over their relatively short (strokes averages -5.0 kA, about one-third the average value for the preceding RS. In 15 cases the video data show a distinct stepped leader to the UI which develops concurrently with the stepped leader to the main RS. Estimated altitude of the UI leader tip just before the main RS occurs ranges from 0 to 610 m, and in 7 cases steps are visible in the UI leader after the main RS. In most of the examples the RS and UI appear as separate channels for their entire visible portion, but in 5 cases there is a junction indicating the UI leader is a cut-off branch from the main leader. A generalized schematic of the seven main luminosity stages in a typical UI, along with video examples showing each of these stages and electric field change data, will be presented.

  7. Traveling Wave MRI at 21.1 T: Propagation below Cut-off for Ultrahigh Field Vertical Bore System

    CERN Document Server

    Tonyushkin, Alexey A; Grant, Samuel C; Kiruluta, Andrew JM

    2014-01-01

    At high magnetic field strengths (> 4 T), the propagation wave vector of the excitation field B1 can no longer be ignored as the wavelength becomes commensurate or smaller than the imaging field of view (FOV), particularly for high dielectric media. The emergence of this propagation wave vector renders the excitation field variant in both time and space. In this paper, the propagation of RF excitation waves in a high field vertical NMR system is demonstrated for the first time with an appropriate screened dielectric waveguide excited by a simple loop coil to enable below cutoff propagation for imaging in the far field. Uniquely, aqueous samples provide the high permittivity required to modify the cut-off requirements of this transmission system. Theory and simulations corroborate the observed propagating modes field patterns. The ease of construction and implementation of this setup permits use in a variety of high field systems. At a minimum, this design provides a larger FOV that is limited primarily by the...

  8. On the newtonian limit and cut--off scales of isothermal dark matter halos with cosmological constant

    CERN Document Server

    Sussman, R A; Sussman, Roberto A.; Hernandez, Xavier

    2003-01-01

    We examine isothermal dark matter halos in hydrostatic equilibrium with a cosmological constant Lambda =Omega_\\Lambda rho_{crit}c^2, where Omega_\\Lambda=0.7, and rho_{crit} is the present value of the critical density with h=0.65. The Newtonian limit of General Relativity yields equilibrium equations that are different from those arising by merely coupling an ``isothermal sphere'' to the Lambda-field within a Newtonian framework. The conditions for the existence and stability of circular geodesic orbits show the existence of (I) an ``isothermal region'' (0r_1) dominated by the Lambda-field, where the Newtonian potential oscillates and circular orbits exist in disconnected patches of the domain of r; (III) a ``transition region'' (r_20.008 M_\\odot {pc}^3, in agreement with rotation curve studies of dwarf galaxies. Since r_2 marks the largest radius of a stable circular orbit, it provides a ``cut off'' radius. For current estimates of rho_c and velocity dispersion of galactic structures, this is around five tim...

  9. Cut-Off Levels of Anti-Mullerian Hormone for The Prediction of Ovarian Response, In Vitro Fertilization Outcome and Ovarian Hyperstimulation Syndrome

    Directory of Open Access Journals (Sweden)

    Ali Salmassi

    2015-07-01

    Full Text Available Background: Evaluation of anti-mullerian hormone (AMH cut-off levels in assisted reproductive technology (ART as predictive factor for individualization of stimulation protocols and to avoid ovarian hyperstimulation syndrome (OHSS. Materials and Methods: In a retrospective study, 177 infertile patients were assessed for AMH in serum and follicular fluid (FF on the day of follicular puncture (FP, between 2012 and 2013 in Kiel, Germany. AMH levels and pregnancy rates were compared between low, moderate and high responders and cut-off levels of low and high responders. AMH cut-off levels in pathological cases were evaluated in analysis 1 (OHSS and in analysis 2 [polycystic ovarian syndrome, (PCOS] and compared in analysis 3 to normal endocrinological parameters. Results: AMH levels in FF were higher than in serum (P<0.001. AMH levels in serum and FF increased from low through moderate to high responders (P<0.001. Pregnancy rates were 14.7, 23.3 and 44.9% (P=0.009, respectively. AMH cut-off level for poor responders was 0.61 ng/ml in serum with a pregnancy rate of 13.8 and 37.1% for below and above of this level, respectively. For FF, it was 1.43 ng/ml. AMH levels in analysis 1 and 2 were significantly higher than in analysis 3 (P=0.001. AMH cut-off level for OHSS was 1.5 ng/ml in serum with OHSS rates of 80.8 and 19.2 % for above and below of the level, respectively. For FF, it was 2.7 ng/ml. PCOS patients had an AMH cut-off level of 3.9 ng/ml in serum and 6.8 ng/ml in FF, resulting in a PCOS rate of 100% above this level. Conclusion: AMH levels can help to assess ovarian response potential and guide ovarian stimulation while avoiding OHSS.

  10. Combined Effect of an Atmospheric River and a Cut-off Low in Hiroshima Flooding Event on August 19, 2014

    Science.gov (United States)

    Takayabu, Y. N.; Hirota, N.; Kato, M.; Arakane, S.

    2015-12-01

    An extraordinary precipitation over 100 mmhr-1in Hiroshima on August 19, 2014, caused a flash flood which resulted in 74 fatalities and collapse of 330 houses. In order to examine the meteorological background of this flooding event, we carried out a detailed analysis utilizing rain gauge data, satellite precipitation dataset, and a meso scale and a global scale objective analyses provided from the Japan Meteorological Agency. Then, we performed numerical experiments using a nonhydrostatic compressible equation model called the Cloud-Resolving Storm Simulator (CReSS). As a result, a combined effect of an atmospheric river (AR) and a cut-off low (COL) in this flooding event was elucidated. During the event, a filamentary transport of moisture extending from the Indochina Peninsula to the Japanese Islands was observed along the southern side of the subtropical jet, forming an AR. This AR had a deep structure with an amount of free tropospheric moisture comparable to that of the boundary layer. Concurrently, there was a COL, detached from the Mid-Pacific Trough, moving northwestward toward the Japanese Archipelago. With various sensitivity experiments, we concluded that a mid-tropospheric instability associated with the cold core of the COL and a dynamical ascent induced in its foreside, collaboratively worked with the anomalous moisture in the free troposphere associated with the AR, to extraordinarily enhance the precipitation over Hiroshima region. An orographic effect to concentrate the precipitation in this region was also confirmed. An implication on a difference in effects of AR in this event with a climatologically moist boundary layer, from those in the US west coast with a very dry environment, was also obtained. Acknowledgment: This study is supported by the Environment Research and Technology Development Fund (2-1503) of the Ministry of the Environment, Japan, and by the Ministry of Education, Culture, Sports, Science and Technology, Japan.

  11. Comparative study of food transfers in the three castes of the honeybee (Apis mellifica ligustica S.) in which four distal sections of both antennae have been cut off

    International Nuclear Information System (INIS)

    The study of food transfers between the three castes of Apis mellifica ligustica S., in which four distal sections have been cut off, has been carried out by means of a radioactive tracer 198Au, which cannot be metabolized. The begging behavior of queens with cut off antennae towards 4-day-old worker Bees and workers of unknown age is not changed. So it is with drones and operated worker Bees which beg food of a worker Bee, that is 4 days old and undamaged. On the other hand the begging behavior of drones and workers of unknown age is reduced towards other worker Bees of unknown age that are undamaged. The two-sided amputation of antennal sections of donor worker Bees of both categories does not change their behavior towards undamaged worker Bees

  12. Interacting power-law and logarithmic entropy-corrected holographic dark energy models with different cut-offs in Brans-Dicke cosmology

    OpenAIRE

    Darabi, F.; Felegary, F.

    2015-01-01

    In the framework of Brans-Dicke cosmology, we have studied the interacting power-law and logarithmic entropy-corrected holographic dark energy models with different cut-offs. The Brans-Dicke parameter is investigated versus the conditions for the acceleration and phantom phases to show that which entropy corrected model can exhibit acceleration with or without the phantom phase at early and present time universes. Moreover, the classical stability or instability of the interacting power-law a...

  13. High cut-off value of a chimeric TSH receptor (Mc4)-based bioassay may improve prediction of relapse in Graves' disease for 12 months.

    Science.gov (United States)

    Hwang, Sena; Shin, Dong Yeob; Song, Mi Kyung; Lee, Eun Jig

    2015-02-01

    There are scarce reports regarding a functional prognostic value of thyroid-stimulating autoantibody (TSAb) levels using a thyroid-stimulating hormone receptor chimera (Mc4) in Graves' disease (GD) in iodine sufficient area. The aim of this study was to investigate whether Mc4-TSAb can predict GD remission/relapse after antithyroid drug (ATD) treatment and to compare Mc4-TSAb with a binding assay using M22 monoclonal antibody (M22-TRAb) in GD patients. We retrospectively reviewed the results of M22-TRAb and Mc4-TSAb in GD patients treated with ATD for 12 months. GD patients who underwent ATD treatment for at least 12 months were included. We compared the predictive values of M22-TRAb and Mc4-TSAb for GD remission and relapse. Of the 92 patients, 60 (65.2%) achieved remission and 32 (34.8%) relapsed within 12 months. In receiver operating characteristic analysis, there were no significant differences in the area under the curves (AUCs) between Mc4-TSAb [AUC=0.79 (95% CI 0.69-0.89)] and M22-TRAb [AUC=0.69 (95% CI 0.58-0.81)]. The optimal predictive cut-off values of M22-TRAb and Mc4-TSAb were 2.23 IU/L and 230%, respectively. At a high Mc4-TSAb cut-off, the better specificity of 85.0% and positive predictive value (PPV) of 69.0% were shown compared with those at the best cut-off for M22-TRAb. In conclusion, a high cut-off for an Mc4 assay may improve the predictive value of relapse with superior specificity and PPV compared with M22-TRAb in treated GD. PMID:24968734

  14. Addenbrooke’s Cognitive Examination and Individual Domain Cut-Off Scores for Discriminating between Different Cognitive Subtypes of Parkinson’s Disease

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    Dagmar Berankova

    2015-01-01

    Full Text Available Objective. The main aim of this study was to verify the sensitivity and specificity of Addenbrooke’s Cognitive Examination-Revised (ACE-R in discriminating between Parkinson’s disease (PD with normal cognition (PD-NC and PD with mild cognitive impairment (PD-MCI and between PD-MCI and PD with dementia (PD-D. We also evaluated how ACE-R correlates with neuropsychological cognitive tests in PD. Methods. We examined three age-matched groups of PD patients diagnosed according to the Movement Disorder Society Task Force criteria: PD-NC, PD-MCI, and PD-D. ROC analysis was used to establish specific cut-off scores of ACE-R and its domains. Correlation analyses were performed between ACE-R and its subtests with relevant neuropsychological tests. Results. Statistically significant differences between groups were demonstrated in global ACE-R scores and subscores, except in the language domain. ACE-R cut-off score of 88.5 points discriminated best between PD-MCI and PD-NC (sensitivity 0.68, specificity 0.91; ACE-R of 82.5 points distinguished best between PD-MCI and PD-D (sensitivity 0.70, specificity 0.73. The verbal fluency domain of ACE-R demonstrated the best discrimination between PD-NC and PD-MCI (cut-off score 11.5; sensitivity 0.70, specificity 0.73 while the orientation/attention subscore was best between PD-MCI and PD-D (cut-off score 15.5; sensitivity 0.90, specificity 0.97. ACE-R scores except for ACE-R language correlated with specific cognitive tests of interest.

  15. Cut-off scores for the Minimal Eating Observation and Nutrition Form – Version II (MEONF-II) among hospital inpatients

    OpenAIRE

    Westergren, Albert; Norberg, Erika; Vallén, Christina; Hagell, Peter

    2011-01-01

    Background and objective: The newly developed Minimal Eating Observation and Nutrition Form - Version II (MEONF-II) has shown promising sensitivity and specificity in relation to the Mini Nutritional Assessment (MNA). However, the suggested MEONF-II cut-off scores for deciding low/moderate and high risk for undernutrition (UN) (>2 and >4, respectively) have not been decided based on statistical criteria but on clinical reasoning. The objective of this study was to identify the optimal c...

  16. Optimal Ki67 cut-off for luminal breast cancer prognostic evaluation: a large case series study with a long-term follow-up.

    Science.gov (United States)

    Bustreo, Sara; Osella-Abate, Simona; Cassoni, Paola; Donadio, Michela; Airoldi, Mario; Pedani, Fulvia; Papotti, Mauro; Sapino, Anna; Castellano, Isabella

    2016-06-01

    Although Ki67 index suffers from poor reproducibility, it is one of the most important prognostic markers used by oncologists to select the treatment of estrogen receptor (ER) positive breast cancer patients. In this study, we aim to establish the optimal Ki67 cut-offs for stratifying patient prognosis and to create a comprehensive prognostic index for clinical applications. A mono-institutional cohort of 1.577 human epidermal growth factor receptor 2 negative/ER+ breast cancer patients having complete clinical, histological, and follow-up data was collected. The 14 and 20 % Ki67 cut-offs were correlated to disease-free interval (DFI) and disease-specific survival (DSS). To create a comprehensive prognostic index, we used independent variables selected by uni/multivariate analyses. In terms of DFI and DSS, patients bearing tumors with Ki67  20 % showed the poorest prognosis. Moreover, to tumor size, the number of metastatic lymph nodes and Ki67 > 20 % was given a score value, varying depending on definite cut-offs and used to create a prognostic index, which was applied to the population. Patients with a prognostic index ≥3 were characterized by significant risk of relapse [DFI: Hazard Ratio (HR) = 4.74, p < 0.001] and death (DSS: HR = 5.03, p < 0.001). We confirm that the 20 % Ki67 cut-off is the best to stratify high-risk patients in luminal breast cancers, and we suggest to integrate it with other prognostic factors, to better stratify patients at risk of adverse outcome. PMID:27155668

  17. Serological diagnosis of pneumococcal infection in children with pneumonia using protein antigens: A study of cut-offs with positive and negative controls.

    Science.gov (United States)

    Andrade, Dafne Carvalho; Borges, Igor Carmo; Ivaska, Lauri; Peltola, Ville; Meinke, Andreas; Barral, Aldina; Käyhty, Helena; Ruuskanen, Olli; Nascimento-Carvalho, Cristiana Maria

    2016-06-01

    The etiological diagnosis of infection by Streptococcus pneumoniae in children is difficult, and the use of indirect techniques is frequently warranted. We aimed to study the use of pneumococcal proteins for the serological diagnosis of pneumococcal infection in children with pneumonia. We analyzed paired serum samples from 13 Brazilian children with invasive pneumococcal pneumonia (positive control group) and 23 Finnish children with viral pharyngitis (negative control group), all aged pharyngitis were evaluated for oropharyngeal colonization, and none of them carried S. pneumoniae. We used a multiplex bead-based assay with eight proteins: Ply, CbpA, PspA1 and 2, PcpA, PhtD, StkP and PcsB. The optimal cut-off for increase in antibody level for the diagnosis of pneumococcal infection was determined for each antigen by ROC curve analysis. The positive control group had a significantly higher rate of ≥2-fold rise in antibody levels against all pneumococcal proteins, except Ply, compared to the negative controls. The cut-off of ≥2-fold increase in antibody levels was accurate for pneumococcal infection diagnosis for all investigated antigens. However, there was a substantial increase in the accuracy of the test with a cut-off of ≥1.52-fold rise in antibody levels for PcpA. When using the investigated protein antigens for the diagnosis of pneumococcal infection, the detection of response against at least one antigen was highly sensitive (92.31%) and specific (91.30%). The use of serology with pneumococcal proteins is a promising method for the diagnosis of pneumococcal infection in children with pneumonia. The use of a ≥2-fold increase cut-off is adequate for most pneumococcal proteins. PMID:26928648

  18. Waist circumference cut-off values for the prediction of cardiovascular risk factors clustering in Chinese school-aged children: a cross-sectional study

    Directory of Open Access Journals (Sweden)

    Xu Ying

    2010-02-01

    Full Text Available Abstract Background Waist circumference has been identified as a valuable predictor of cardiovascular risk in children. The development of waist circumference percentiles and cut-offs for various ethnic groups are necessary because of differences in body composition. The purpose of this study was to develop waist circumference percentiles for Chinese children and to explore optimal waist circumference cut-off values for predicting cardiovascular risk factors clustering in this population. Methods Height, weight, and waist circumference were measured in 5529 children (2830 boys and 2699 girls aged 6-12 years randomly selected from southern and northern China. Blood pressure, fasting triglycerides, low-density lipoprotein cholesterol, high-density lipoprotein cholesterol, and glucose were obtained in a subsample (n = 1845. Smoothed percentile curves were produced using the LMS method. Receiver-operating characteristic analysis was used to derive the optimal age- and gender-specific waist circumference thresholds for predicting the clustering of cardiovascular risk factors. Results Gender-specific waist circumference percentiles were constructed. The waist circumference thresholds were at the 90th and 84th percentiles for Chinese boys and girls respectively, with sensitivity and specificity ranging from 67% to 83%. The odds ratio of a clustering of cardiovascular risk factors among boys and girls with a higher value than cut-off points was 10.349 (95% confidence interval 4.466 to 23.979 and 8.084 (95% confidence interval 3.147 to 20.767 compared with their counterparts. Conclusions Percentile curves for waist circumference of Chinese children are provided. The cut-off point for waist circumference to predict cardiovascular risk factors clustering is at the 90th and 84th percentiles for Chinese boys and girls, respectively.

  19. Cerebrospinal fluid neopterin analysis in neuropediatric patients: establishment of a new cut off-value for the identification of inflammatory-immune mediated processes.

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    Marta Molero-Luis

    Full Text Available OBJECTIVE: A high level of cerebrospinal fluid (CSF neopterin is a marker of central nervous system inflammatory-immune mediated processes. We aimed to assess data from 606 neuropediatric patients, describing the clinical and biochemical features of those neurological disorders presenting CSF neopterin values above a new cut-off value that was defined in our laboratory. METHODS: To establish the new CSF neopterin cut-off value, we studied two groups of patients: Group 1 comprised 68 patients with meningoencephalitis, and Group 2 comprised 52 children with a confirmed peripheral infection and no central nervous system involvement. We studied 606 CSF samples from neuropediatric patients who were classified into 3 groups: genetic diagnosis (A, acquired/unknown etiologic neurologic diseases (B and inflammatory-immune mediated processes (C. RESULTS: The CSF neopterin cut-off value was 61 nmol/L. Out of 606 cases, 56 presented a CSF neopterin level above this value. Group C had significantly higher CSF neopterin, protein and leukocyte values than the other groups. Sixteen of twenty-three patients in this group had a CSF neopterin level above the cut-off, whereas three and seven patients presented increased leukocyte and protein values, respectively. A significant association was found among CSF neopterin, proteins and leukocytes in the 606 patients. White matter disturbances were associated with high CSF neopterin concentrations. CONCLUSIONS: Although children with inflammatory-immune mediated processes presented higher CSF neopterin values, patients with other neurological disorders also showed increased CSF neopterin concentrations. These results stress the importance of CSF neopterin analysis for the identification of inflammatory-immune mediated processes.

  20. CA-125 cut-off value as a predictor for complete interval debulking surgery after neoadjuvant chemotherapy in patients with advanced ovarian cancer

    OpenAIRE

    Furukawa, Naoto; Sasaki, Yoshikazu; Shigemitsu, Aiko; AKASAKA, JURIA; Kanayama, Seiji; Kawaguchi, Ryuji; Kobayashi, Hiroshi

    2013-01-01

    Objective In the present study, we evaluated changes in CA-125 cut-off values predictive of complete interval debulking surgery (IDS) after neoadjuvant chemotherapy (NAC) using receiver operating characteristic (ROC) analysis. Methods This retrospective single-institution study included patients with International Federation of Gynecology and Obstetrics (FIGO) stage III epithelial ovarian cancer and a pre-NAC serum CA-125 level of greater than 40 U/mL who were treated with neoadjuvant platinu...

  1. Optimal Cut-Off Points for Two-Step Strategy in Screening of Undiagnosed Diabetes: A Population-Based Study in China

    OpenAIRE

    Ye, Zhen; Cong, Liming; Ding, Gangqiang; Yu, Min; Zhang, Xinwei; Hu, Ruying; Wu, Jianjun; Fang, Le; Wang, Hao; Zhang, Jie; He, Qingfang; Su, Danting; Zhao, Ming; Wang, Lixin; GONG, WEIWEI

    2014-01-01

    To identify optimal cut-off points of fasting plasma glucose for two-step strategy in screening of undiagnosed diabetes in Chinese people, data were selected from two cross-sectional studies of Metabolic Syndrome in Zhejiang Province of China, Zhejiang Statistical Yearbook (2010), and published literatures. Two-step strategy was used among 17437 subjects sampled from population to screen undiagnosed diabetes. Effectiveness (proportion of cases identified), costs (including medical and non-med...

  2. Optimal Elasticity cut-off value for discriminating Healthy to Pathological Fibrotic patients employing Fuzzy C-Means automatic segmentation in Liver Shear Wave Elastography images

    Science.gov (United States)

    Gatos, Ilias; Tsantis, Stavros; Skouroliakou, Aikaterini; Theotokas, Ioannis; Zoumpoulis, Pavlos S.; Kagadis, George C.

    2015-09-01

    The aim of the present study is to determine an optimal elasticity cut-off value for discriminating Healthy from Pathological fibrotic patients by means of Fuzzy C-Means automatic segmentation and maximum participation cluster mean value employment in Shear Wave Elastography (SWE) images. The clinical dataset comprised 32 subjects (16 Healthy and 16 histological or Fibroscan verified Chronic Liver Disease). An experienced Radiologist performed SWE measurement placing a region of interest (ROI) on each subject's right liver lobe providing a SWE image for each patient. Subsequently Fuzzy C-Means clustering was performed on every SWE image utilizing 5 clusters. Mean Stiffness value and pixels number of each cluster were calculated. The mean stiffness value feature of the cluster with maximum pixels number was then fed as input for ROC analysis. The selected Mean Stiffness value feature an Area Under the Curve (AUC) of 0.8633 with Optimum Cut-off value of 7.5 kPa with sensitivity and specificity values of 0.8438 and 0.875 and balanced accuracy of 0.8594. Examiner's classification measurements exhibited sensitivity, specificity and balanced accuracy value of 0.8125 with 7.1 kPa cutoff value. A new promising automatic algorithm was implemented with more objective criteria of defining optimum elasticity cut-off values for discriminating fibrosis stages for SWE. More subjects are needed in order to define if this algorithm is an objective tool to outperform manual ROI selection.

  3. Excitation energy and angular momentum dependence of nuclear level densities and spin cut-off factor in SPA and SPA + RPA approaches

    International Nuclear Information System (INIS)

    We investigate the excitation energy (E*) and angular momentum (J) dependence of nuclear level density and spin cut-off factor (σ) within microscopic approaches based on SPA and its extension SPA+RPA representation of the grand partition function for quadrupole-quadrupole interaction model Hamiltonian. For 110Sn, we find that excitation energy dependence of the total level density obtained within these approaches is significantly different. On the other hand, these approaches yield similar behaviour for J-dependence of the level density at fixed values of E*. Values of σSPA+RPA at low E* are found to be slightly smaller than σSPA but they tend to become almost the same at higher E* (>30 MeV). We also find that Bethe's formula for fixed-J level density based on the spin cut-off approximation can be used to compute ρ(E*,J) near the yrast line provided one uses an appropriate value of the spin cut-off factor. (orig.)

  4. Determination of Diastolic Dysfunction Cut-Off Value by Tissue Doppler Imaging in Adults 70 Years of Age or Older: A Comparative Analysis of Pulsed-Wave and Color-Coded Tissue Doppler Imaging

    OpenAIRE

    Baek, Hee-Kyung; Park, Tae-Ho; Park, Sun-Yi; Kim, Jung-Hwan; Seo, Jeong-Min; Kim, Woo-Jae; Nam, Young-Hee; Kim, Moo-Hyun; Kim, Young-Dae

    2011-01-01

    Background and Objectives The cut-off value of diastolic dysfunction by tissue Doppler imaging (TDI) is affected by aging and modalities used (pulsed-wave vs. color-coded). The purpose of this study was to investigate the diastolic function of healthy elderly people and to determine the appropriate cut-off value of diastolic dysfunction in elderly individuals. Subjects and Methods Healthy volunteers (n=76) and patients with hypertension (n=51) aged ≥70 years underwent 2-dimensional and Dopple...

  5. Therapeutic significance of a D-dimer cut-off level of >3 μg/ml in colorectal cancer patients treated with standard chemotherapy plus bevacizumab

    International Nuclear Information System (INIS)

    The risk of venous thromboembolism has been reported to increase when receiving bevacizumab. Many cancer patients are reported to have elevated D-dimer levels. It is not clear what D-dimer level might indicate an increased risk of venous thromboembolism in the colorectal cancer patients treated with bevacizumab-containing chemotherapy. The D-dimer levels and any event concurrent with an elevated D-dimer level were evaluated in patients receiving bevacizumab. The D-dimer cut-off level was determined using the receiver-operating characteristic analysis. The selection criteria were as follows: histologically proven metastatic and unresectable colorectal adenocarcinoma; no prior chemotherapy containing bevacizumab; D-dimer test performed repetitively on the baseline and during bevacizumab administration; no venous thromboembolism identified at the baseline; and enhanced computed tomographic scan performed every 2 months. Sixty-nine patients were included. The chemotherapy regimens with bevacizumab included the regimen of 5-fluorouracil, leucovorin and oxaliplatin (FOLFOX), the regimen of 5-fluorouracil, leucovorin and irinotecan (FOLFIRI), and leucovorin-modulated 5-fluorouracil. The median baseline D-dimer level was 1.2 μg/ml. The appropriate D-dimer cut-off level was 3 μg/ml with the negative predictive value of 98% and relative risk of 6.9. Twenty-one of 69 patients showed elevated D-dimer levels of >3 μg/ml, with 11 patients for unknown reasons, 6 with tumor progression, 3 with venous thromboembolism and 1 with sepsis. In the remaining 48 patients whose D-dimer levels were ≤3 μg/ml, only one patient developed a venous thromboembolism. A D-dimer cut-off level of 3 μg/ml might be a useful indicator level to exclude venous thromboembolism or show an increased risk for venous thromboembolism in colorectal cancer patients treated with bevacizumab-containing chemotherapy. (author)

  6. Bovine Tuberculosis in Cattle in the Highlands of Cameroon: Seroprevalence Estimates and Rates of Tuberculin Skin Test Reactors at Modified Cut-Offs

    Directory of Open Access Journals (Sweden)

    J. Awah-Ndukum

    2012-01-01

    Full Text Available The aim of this study was to obtain epidemiological estimates of bovine tuberculosis (TB prevalence in cattle in the highlands of Cameroon using two population-based tuberculin skin test (TST surveys in the years 2009 and 2010. However, prior to the TST survey in 2010, blood was collected from already chosen cattle for serological assay. Anti-bovine TB antibodies was detected in 37.17% of tested animals and bovine TB prevalence estimates were 3.59%–7.48%, 8.92%–13.25%, 11.77%–17.26% and 13.14%–18.35% for comparative TST at ≥4 mm, ≥3 mm and ≥2 mm cut-off points and single TST, respectively. The agreement between TST and lateral flow was generally higher in TST positive than in TST negative subjects. The K coefficients were 0.119, 0.234, 0.251 and 0.254 for comparative TST at ≥4 mm, ≥3 mm and ≥2 mm cut-off points and the single TST groups, respectively. Chi square statistics revealed that strong (P48 associations existed between seroprevalence rates and TST reactors. The study suggested that using lateral flow assay and TST at severe interpretations could improve the perception of bovine TB in Cameroon. The importance of defining TST at modified cut-offs and disease status by post-mortem detection and mycobacterial culture of TB lesions in local environments cannot be overemphasised.

  7. Optimal cut-off points on the health anxiety inventory, illness attitude scales and whiteley index to identify severe health anxiety.

    Directory of Open Access Journals (Sweden)

    Erik Hedman

    Full Text Available Health anxiety can be viewed as a dimensional phenomenon where severe health anxiety in form of DSM-IV hypochondriasis represents a cut-off where the health anxiety becomes clinically significant. Three of the most reliable and used self-report measures of health anxiety are the Health Anxiety Inventory (HAI, the Illness Attitude Scales (IAS and the Whiteley Index (WI. Identifying the optimal cut-offs for classification of presence of a diagnosis of severe health anxiety on these measures has several advantages in clinical and research settings. The aim of this study was therefore to investigate the HAI, IAS and WI as proximal diagnostic instruments for severe health anxiety defined as DSM-IV hypochondriasis.We investigated sensitivity, specificity and predictive value on the HAI, IAS and WI using a total of 347 adult participants of whom 158 had a diagnosis of severe health anxiety, 97 had obsessive-compulsive disorder and 92 were healthy non-clinical controls. Diagnostic assessments were conducted using the Anxiety Disorder Interview Schedule.Optimal cut-offs for identifying a diagnosis of severe health anxiety was 67 on the HAI, 47 on the IAS, and 5 on the WI. Sensitivity and specificity were high, ranging from 92.6 to 99.4%. Positive and negative predictive values ranged from 91.6 to 99.4% using unadjusted prevalence rates.The HAI, IAS and WI have very good properties as diagnostic indicators of severe health anxiety and can be used as cost-efficient proximal estimates of the diagnosis.

  8. Effectiveness of Different Waist Circumference Cut-off Values in Predicting Metabolic Syndrome Prevalence and Risk Factors in Adults in China

    Institute of Scientific and Technical Information of China (English)

    ZHOU Hai Cheng; TIAN Hao Ming; JI Qiu He; ZHU Da Long; CHEN Li; GUO Xiao Hui; ZHAO Zhi Gang; Li Qiang; ZHOU Zhi Guang; GE Jia Pu; SHAN Guang Liang; LAI Ya Xin; SHAN Zhong Yan; JIA Wei Ping; YANG Wen Ying; LU Ju Ming; WENG Jian Ping; JI Li Nong; LIU Jie

    2014-01-01

    Objective To study the effectiveness of waist circumference cut-off values in predicting the prevalence of metabolic syndrome (MetS) and risk factors in adults in China. Methods A cross-sectional survey was condcuted in 14 provinces (autonomous region, municipality) in China. A total of 47 325 adults aged ≥20 years were selected by multistage stratified sampling, and questionnaire survey and physical and clinical examination were conducted among them. MetS was defined according to the International Diabetes Federation (IDF) criteria and modified IDF criteria. Results The age-standardized prevalence of MetS was 24.2%(22.1%in men and 25.8%in women) and 19.5% (22.1% in men and 18.0% in women) according to the IDF criteria and modified IDF criteria respectively. The age-standardized prevalence of pre-MetS was 8.1%(8.6%in men and 7.8%in women) according to the modified IDF criteria. The prevalence of MetS was higher in urban residents than rural residents and in northern China residents than in southern China residents. The prevalence of central obesity was about 30% in both men and women according to the ethnicity-specific cut-off values of waist circumference for central obesity (90 cm for men and 85 cm for women). Multivariate regression analysis revealed no significant difference in risk factors between the two MetS definitions. Conclusion Using both the modified IDF criteria and ethnicity-specific cut-off values of waist circumference can provide more useful information about the prevalence of MetS in China.

  9. Cut-off points of the visceral adiposity index (VAI identifying a visceral adipose dysfunction associated with cardiometabolic risk in a Caucasian Sicilian population

    Directory of Open Access Journals (Sweden)

    Amato Marco C

    2011-10-01

    Full Text Available Abstract Background The Visceral Adiposity Index (VAI is a sex-specific mathematical index, based on Waist Circumference (WC, Body Mass Index (BMI, triglycerides (TG and HDL cholesterol (HDL levels, indirectly expressing visceral adipose function and insulin sensitivity. Our aim was to find the optimal cut-off points of VAI identifying a visceral adipose dysfunction (VAD associated with cardiometabolic risk in a Caucasian Sicilian population. Methods Medical check-up data of 1,764 Primary Care patients (PC patients were retrospectively and cross-sectionally examined using a receiver-operating characteristic (ROC curve to determine appropriate stratified-for-age cut-off of VAI, for the identification of PC patients with Metabolic Syndrome (MetS according to the NCEP-ATP III criteria. The PC patients with higher VAI scores were subdivided into three groups according to VAI tertiles (i.e. PC patients with mild VAD, moderate VAD or severe VAD. Finally, VAD classes were compared to classical cardio- and cerebrovascular risk factors as independent predictors of coronary heart disease and/or myocardial infarction, transient ischemic attack and/or ischemic stroke. Results Moderate and severe VADs proved to be independently associated with cardiovascular events [(OR: 5.35; 95% CI: 1.92-14.87; p = 0.001 and (OR: 7.46; 95% CI: 2.64-21.05; p Conclusions Our study suggests that among Caucasian Sicilian subjects there are clear cut-off points of VAI able to identify a VAD strongly associated with cardiometabolic risk.

  10. High speed tool steel cut off dies made using powder metallurgy techniques; Fabricacion de matrices de corte con aceros rapidos para herramientas mediante metalurgia de polvos

    Energy Technology Data Exchange (ETDEWEB)

    Talacchia, S.; Amador, J.; Urcola, J. [Escuela Superior de Ingenieros, Universidad de Navarra, San Sebastian (Spain)

    1996-06-01

    The present work summarises the results obtained by compacting water atomized powders of T42 modifed carbon and vanadium, M3/2 and M2 high speed steels. The powders were compacted under complex forms (cut off dies) and sintered under a 90 N{sub 2}-9 H{sub 2}-1 CH{sub 4} industrial atmosphere. Heat treatments in different severity media were performed. hardness of 1,100 HV can be obtained in the case of T42 modified steel. Also, the shrinking of the sintered specimens was study. (Author) 6 refs.

  11. Effect of the magnetospheric DCF and DR current systems of on cosmic ray geomagnetic cut-off rigidities in Forbush effect event periods in June and August 1972

    International Nuclear Information System (INIS)

    The effect of magnetospheric DCF and DR current systems on regidity of geomagnetic cut-off of cosmic rays (CR) in the periods of Forbush effect in June and August,1972 is considered. It is shown that magnetospheric CR effects conditioned by DCF and DR current fields are opposite in sign and comparable in value during strong disturbances of solar wind velocity. Belts of the most probable current localization in the process of development and evolution of magnetospheric DR current exist in the distances: 4R3(R3-Earth radius) and GR3 in the June event and about 2R3, 4R3 and GR3 in the August event

  12. Influence of the Lift-Off Effect on the Cut-Off Frequency of the EMAT-Generated Rayleigh Wave Signal

    OpenAIRE

    Pengxing Yi; Kang Zhang; Yahui Li; Xuming Zhang

    2014-01-01

    The electromagnetic acoustic transducer (EMAT), a non-contact NDT tool with large lift-off, is becoming an attractive method for detecting the cracks in the metal parts. However, the lift-off of the transducer has a direct effect on the feature that is used to characterize the defects. A detailed investigation on the relationship between the feature and the lift-off of the EMAT is crucial in the detection process. This paper investigates the lift-off effect on the feature, cut-off frequency o...

  13. Slurry walls and slurry trenches - construction quality control

    International Nuclear Information System (INIS)

    Slurry (panel) walls and slurry trenches have become conventional methods for construction of deep underground structures, interceptor trenches and hydraulic (cutoff) barriers. More recently polymers mixed with water are used to stabilize the excavation instead of bentonite slurry. Slurry walls are typically excavated in short panel segments, 2 to 7 m (7 to 23 ft) long, and backfilled with structural materials; whereas slurry trenches are fairly continuous excavations with concurrent backfilling of blended soils, or cement-bentonite mixtures. Slurry trench techniques have also been used to construct interceptor trenches. Currently no national standards exist for the design and/or construction of slurry walls/trenches. Government agencies, private consultants, contractors and trade groups have published specifications for construction of slurry walls/trenches. These specifications vary in complexity and quality of standards. Some place excessive emphasis on the preparation and control of bentonite or polymer slurry used for excavation, with insufficient emphasis placed on quality control of bottom cleaning, tremie concrete, backfill placement or requirements for the finished product. This has led to numerous quality problems, particularly with regard to identification of key depths, bottom sediments and proper backfill placement. This paper will discuss the inspection of slurry wall/trench construction process, identifying those areas which require special scrutiny. New approaches to inspection of slurry stabilized excavations are discussed

  14. Power-law and Logarithmic Entropy Corrected Holographic Dark Energy Models in Brans-Dicke Cosmology with Granda-Oliveros Cut-Off

    CERN Document Server

    Pasqua, Antonio; Myrzakulov, Ratbay

    2015-01-01

    In this paper, the cosmological implications of the Power Law Entropy Corrected Holographic Dark Energy (PLECHDE) and the Logarithmic Entropy Corrected Holographic Dark Energy (LECHDE) models in the context of Brans-Dicke (BD) cosmology for both non-interacting and interacting DE and Dark Matter (DM) are studied. As the system infrared cut-off, we choose the recently proposed Granda-Oliveros cut-off, which contains a term proportional to the first time derivative of the Hubble parameter and one term proportional to $H^2$, i.e. the Hubble parameter squared. We obtain the expressions of three quantities, i.e. the Equation of State (EoS) parameter $\\omega_D$, the deceleration parameter $q$ and the evolutionary form of the energy density parameter $\\Omega'_D$ of the PLECHDE and LECHDE models in a non-flat Universe for non-interacting and interacting DE and DM as well. Moreover, we investigate the limiting cases corresponding to: a) absence of entropy corrections; b) Einstein's gravity; and c) concomitantly absenc...

  15. Power-Law Entropy-Corrected Holographic Dark Energy in Ho\\v{r}ava-Lifshitz Cosmology with Granda-Oliveros Cut-off

    CERN Document Server

    Pasqua, Antonio; Myrzakulov, Ratbay

    2015-01-01

    In this work, we decided to study the Power Law Entropy Corrected Holographic Dark Energy (PLECHDE) model in the framework of a spatially non-flat Universe and in the framework of Ho\\v{r}ava-Lifshitz cosmology with infrared (IR) cut-off given by recently proposed Granda-Oliveros cut-off which contains one term proportional to the Hubble parameter squared and one proportional to the time derivative of the Hubble parameter. For the two cases corresponding to non-interacting and interacting DE and Dark Matter (DM), we derive the evolutionary form of the energy density of DE, the Equation of State (EoS) parameter $\\omega_D$, the evolutionary form of the fractional energy density $\\Omega_D'$ and the deceleration parameter $q$. Using the parametrization of the EoS parameter $\\omega_D\\left(z\\right)=\\omega_0+\\omega_1 z$, we obtain the expressions of $\\omega_0$ and $\\omega_1$ for both non-interacting and interacting Dark Sectors. We also study the statefinder parameters $\\left\\{ r,s \\right\\}$, the properties of some c...

  16. 截锥形直杆的动力稳定性研究%Research on the dynamic stability of cut-off-cone bar

    Institute of Scientific and Technical Information of China (English)

    夏鹭平

    2001-01-01

    This paper discusses the effect of dynamic stability of cut-off-cone bar under vertical vibration force. The influence of cut-off-cone bar and equal section bar on the dynamic property of bars is analyzed respectively. A theoretical method of analyzing the dynamic stability of bars is presented. Some suggestions are made about reducing the unfavourable effect in practical engineering. The work here may be useful to the dynamic analysis and design in practical engineering.%研究了截锥形直杆在竖向振动力作用下,杆件参数共振和动力稳定性问题,分析了截锥形直杆和等截面直杆对杆件动力性能的影响,提出了一种分析杆件动力稳定性的理论方法,方法简明易用,便于掌握,并提出了在实际工程中减小共振的一些措施,为结构的动力分析与设计提供参考依据。

  17. Influence of the Lift-Off Effect on the Cut-Off Frequency of the EMAT-Generated Rayleigh Wave Signal

    Directory of Open Access Journals (Sweden)

    Pengxing Yi

    2014-10-01

    Full Text Available The electromagnetic acoustic transducer (EMAT, a non-contact NDT tool with large lift-off, is becoming an attractive method for detecting the cracks in the metal parts. However, the lift-off of the transducer has a direct effect on the feature that is used to characterize the defects. A detailed investigation on the relationship between the feature and the lift-off of the EMAT is crucial in the detection process. This paper investigates the lift-off effect on the feature, cut-off frequency of EMAT in the Rayleigh wave. The study can be divided into two parts. Firstly, with a multi-field coupling environment, 2-D electromagnetic and wave generation EMAT models are built to simulate the interaction of the Rayleigh wave with the surface crack. Then, the lift-off effect on the cut-off frequency is investigated through simulation and experiment. Compared to the previous studies, it is found that lift-off would cause a negative result when the lift-off varies in the testing process. Besides, the calibration obtained from the tests at a random lift-off value can be used in other tests with any different lift off value provided that the lift-off is kept as a constant during the detection process.

  18. Analysis of the acoustic cut-off frequency and high-frequency peaks in six Kepler stars with stochastically excited pulsations

    Science.gov (United States)

    Jiménez, A.; García, R. A.; Pérez Hernández, F.; Mathur, S.

    2015-11-01

    Gravito-acoustic modes in the Sun and other stars propagate in resonant cavities with a frequency below a given limit known as the cut-off frequency. At higher frequencies, waves are no longer trapped in the stellar interior and become traveller waves. In this article, we study six pulsating solar-like stars at different evolutionary stages observed by the NASA Kepler mission. These high signal-to-noise targets show a peak structure that extends at very high frequencies and are good candidates for studying the transition region between the modes and interference peaks or pseudo-modes. Following the same methodology successfully applied on Sun-as-a-star measurements, we uncover the existence of pseudo-modes in these stars with one or two dominant interference patterns depending on the evolutionary stage of the star. We also infer their cut-off frequency as the midpoint between the last eigenmode and the first peak of the interference patterns. Using ray theory we show that, while the period of one of the interference patterns is very close to half the large separation, the period of the other interference pattern depends on the time phase of mixed waves, thus carrying additional information on the stellar structure and evolution. Appendix A is available in electronic form at http://www.aanda.org

  19. Bivariate distributions in statistical spectroscopy studies: Fixed-J level densities, fixed-J averages and spin cut-off factors

    International Nuclear Information System (INIS)

    Analytical studies with the TBRE ensemble, supplemented by numerical calcultions with realistic interactions show that for large particle numbers, the bivariate cumulants (ksub(rs)) defined for the Hamiltonian operator (H) and the Jsub(z) operator, are very small; vertical strokeksub(rs)vertical stroke< or approx.0.3 for 3<=r+s<=6. As a result the expansions around a bivariate normal density are meaningful for the fixed-M densities (rho(E,M)). We adopt a bivariate Edgeworth expansion for rho(E,M) and give a compact form for the same. Finally using this rho(E,M) (which also define fixed-J densities uniquely), new series expansions are given for fixed-M (and hence for fixed-J) averages of the powers of H and also for the spin cut-off factors. (orig.)

  20. Diagnostic Accuracy of Sixty Four Multi-Slice CT Angiography in Assessment of Arterial Cut-Off and Run-Off in Comparison with Surgical Findings

    Directory of Open Access Journals (Sweden)

    M. Noaparast

    2011-06-01

    Full Text Available Background/Objective: The accurate anatomic mapping and determination of the severity of arterial disease, an important health problem of the elderly, is of great significance. We aimed todetermine the diagnostic value of 64-multislice CT angiography (MSCTA in run-off and cut-off sites of arterial disease.Patients and Methods: Throughout the study, MSCTA followed by an operative intervention was carried out on a total of 38 patients with clinical signs and symptoms suggestive of arterialdisease (AD all of whom had the indication for vascular surgery. The mean age of patients was 34±15.86 (range, 23 to 93 years. MSCTA was executed using a 64-slice CT scanner, during the arterial phase of injecting the nonionic, contrast medium with a power injector at the rate of 5 ml/sec into the antecubital vein and exploration and revascularization of peripheral arterial disease was performed intraoperatively.Results: Atherosclerosis and arterial disease, the most common causes of vascular occlusion,were more common in the lower extremities. According to MSCTA findings, the most frequentsite of stenosis was the superficial femoral artery. Spearman’s correlation coefficient showed a high degree of agreement amongst the raters. The sensitivity, specificity, positive predictivevalue (PPV, negative predictive value (NPV and the accuracy of MSCTA compared to surgery were 83.8%, 96%, 96.8%, 81.3% and 89%, respectively. MSCTA findings were compared with surgeryas a standard of reference, which showed concordance in the majority of cases (81.6%. Cut-off sites were correctly identified by MSCTA in 97.3% of the patients and the most common sites of discordance were the run-off sites (18.2%.Conclusion: MSCTA angiography as a novel diagnostic modality may be a suitable alternative and a viable choice for routine clinical diagnosis.

  1. EARLY APPLICATION OF HIGH CUT-OFF HAEMODYALISIS FOR DE-NOVO MYELOMA NEPHROPATHY IS ASSOCIATED WITH LONG-TERM DIALYSIS-INDEPENDENCY AND RENAL RECOVERY

    Directory of Open Access Journals (Sweden)

    Alhossain A. Khalafallah

    2013-01-01

    Full Text Available Background Multiple myeloma (MM is a haematological malignancy associated with kidney injury resulting from cast nephropathy, which can be caused by monoclonal free light chains (FLC. It has been demonstrated that reduction of FLC can lead to a higher proportion of patients recovering renal function with a better outcome, especially if extended high cut-off haemodialysis (HCO-HD combined with chemotherapy is used. Patients and Methods In this study, four cases of MM nephropathy were treated with HCO-HD and chemotherapy at a single institution during the period from August 2009 to August 2011. All of the patients presented with acute renal failure and high serum FLC. All patients underwent a bone marrow biopsy to confirm the diagnosis of MM, according to the WHO criteria. Three patients had de-novo MM and one patient had relapsed light chain myeloma disease. All patients underwent HCO-HD concomitantly with specific myeloma therapy once the diagnosis or relapse of MM was established. Results After a median follow up of 26 months, (range, 13-36 our data showed that all patients had a significant decrease in serum FLC through HCO-HD, proving the effectiveness of HCO-HD in managing MM. De-novo MM patients restored their renal function and achieved low-level FLC early on the treatment and become dialysis-independent. One patient with relapsed myeloma remained dialysis dependant. Conclusion Our study suggests that if myeloma nephropathy associated with light-chain disease, HCO-HD should be initiated as early as possible. At the same time a specific MM treatment should be initiated to gain control of the disease and salvage the kidneys in order to achieve dialysis-independency. Further trials to confirm our results are warranted. Key Words: Multiple myeloma, renal failure, High cut-off haemodialysis, chemotherapy, outcome.

  2. Diagnostic accuracy of sixty four multi-slice CT angiography in assessment of arterial cut-off and run-off in comparison with surgical findings

    International Nuclear Information System (INIS)

    The accurate anatomic mapping and determination of the severity of arterial disease, an important health problem of the elderly, is of great significance. We aimed to determine the diagnostic value of 64-multislice CT angiography in run-off and cut-off sites of arterial disease. Patients and Methods: Throughout the study, multislice CT angiography followed by an operative intervention was carried out on a total of 38 patients with clinical signs and symptoms suggestive of arterial disease all of whom had the indication for vascular surgery. The mean age of patients was 34±15.86 (range, 23 to 93) years. Multislice CT angiography was executed using a 64-slice CT scanner, during the arterial phase of injecting the nonionic, contrast medium with a power injector at the rate of 5 ml/sec into the antecubital vein and exploration and revascularization of peripheral arterial disease was performed intraoperatively. Results: Atherosclerosis and arterial disease, the most common causes of vascular occlusion, were more common in the lower extremities. According to multislice CT angiography findings, the most frequent site of stenosis was the superficial femoral artery. Spear man's correlation coefficient showed a high degree of agreement amongst the raters. The sensitivity, specificity, positive predictive value, negative predictive value and the accuracy of multislice CT angiography compared to surgery were 83.8%, 96%, 96.8%, 81.3% and 89%, respectively. Multislice CT angiography findings were compared with surgery as a standard of reference, which showed concordance in the majority of cases (81.6%). Cut-off sites were correctly identified by multislice CT angiography in 97.3% of the patients and the most common sites of discordance were the run-off sites (18.2%). Conclusion: multislice CT angiography angiography as a novel diagnostic modality may be a suitable alternative and a viable choice for routine clinical diagnosis.

  3. Optimal cut-off of homeostasis model assessment of insulin resistance (HOMA-IR) for the diagnosis of metabolic syndrome: third national surveillance of risk factors of non-communicable diseases in Iran (SuRFNCD-2007)

    OpenAIRE

    Rashidi Armin; Nakhjavani Manouchehr; Zandieh Ali; Khalilzadeh Omid; Ashraf Haleh; Esteghamati Alireza; Haghazali Mehrdad; Asgari Fereshteh

    2010-01-01

    Abstract Aim We have recently determined the optimal cut-off of the homeostatic model assessment of insulin resistance for the diagnosis of insulin resistance (IR) and metabolic syndrome (MetS) in non-diabetic residents of Tehran, the capital of Iran. The aim of the present study is to establish the optimal cut-off at the national level in the Iranian population with and without diabetes. Methods Data of the third National Surveillance of Risk Factors of Non-Communicable Diseases, available f...

  4. wall

    Directory of Open Access Journals (Sweden)

    Irshad Kashif

    2016-01-01

    Full Text Available Maintaining indoor climatic conditions of buildings compatible with the occupant comfort by consuming minimum energy, especially in a tropical climate becomes a challenging problem for researchers. This paper aims to investigate this problem by evaluating the effect of different kind of Photovoltaic Trombe wall system (PV-TW on thermal comfort, energy consumption and CO2 emission. A detailed simulation model of a single room building integrated with PV-TW was modelled using TRNSYS software. Results show that 14-35% PMV index and 26-38% PPD index reduces as system shifted from SPV-TW to DGPV-TW as compared to normal buildings. Thermal comfort indexes (PMV and PPD lie in the recommended range of ASHARE for both DPV-TW and DGPV-TW except for the few months when RH%, solar radiation intensity and ambient temperature were high. Moreover PVTW system significantly reduces energy consumption and CO2 emission of the building and also 2-4.8 °C of temperature differences between indoor and outdoor climate of building was examined.

  5. Direct Extraction of InP/GaAsSb/InP DHBT Equivalent-Circuit Elements From S-Parameters Measured at Cut-Off and Normal Bias Conditions

    DEFF Research Database (Denmark)

    Johansen, Tom Keinicke; Leblanc, Rémy; Poulain, Julien;

    2016-01-01

    A unique direct parameter extraction method for the small-signal equivalent-circuit model of InP/GaAsSb/InP double heterojunction bipolar transistors (DHBTs) is presented. $S$-parameters measured at cut-off bias are used, at first, to extract the distribution factor $X_{0}$ for the base...

  6. Prevalence of swallowing and speech problems in daily life after chemoradiation for head and neck cancer based on cut-off scores of the patient-reported outcome measures SWAL-QOL and SHI

    NARCIS (Netherlands)

    Rinkel, Rico N; Verdonck-de Leeuw, Irma M; Doornaert, Patricia; Buter, Jan; de Bree, Remco; Langendijk, Johannes A; Aaronson, Neil K; Leemans, C René

    2015-01-01

    The objective of this study is to assess swallowing and speech outcome after chemoradiation therapy for head and neck cancer, based on the patient-reported outcome measures Swallowing Quality of Life Questionnaire (SWAL-QOL) and Speech Handicap Index (SHI), both provided with cut-off scores. This is

  7. Prevalence of swallowing and speech problems in daily life after chemoradiation for head and neck cancer based on cut-off scores of the patient-reported outcome measures SWAL-QOL and SHI

    NARCIS (Netherlands)

    Rinkel, Rico N.; Verdonck-de Leeuw, Irma M.; Doornaert, Patricia; Buter, Jan; de Bree, Remco; Langendijk, Johannes A.; Aaronson, Neil K.; Leemans, C. Rene

    2016-01-01

    The objective of this study is to assess swallowing and speech outcome after chemoradiation therapy for head and neck cancer, based on the patient-reported outcome measures Swallowing Quality of Life Questionnaire (SWAL-QOL) and Speech Handicap Index (SHI), both provided with cut-off scores. This is

  8. Age-dependent D-dimer cut-off to avoid unnecessary CT-exams for ruling-out pulmonary embolism; Altersangepasste Anhebung des D-Dimer-Grenzwertes zur Vermeidung unnoetiger CT-Untersuchungen bei Verdacht auf Lungenarterienembolie

    Energy Technology Data Exchange (ETDEWEB)

    Altmann, M.M.; Hoehne, M.; Herold, T. [HELIOS Klinikum Berlin-Buch (Germany). Radiology; Wrede, C.E. [HELIOS Klinikum Berlin-Buch (Germany). Emergency Department; Peetz, D. [HELIOS Klinikum Berlin-Buch (Germany). Laboratory Medicine; Stroszczynski, C. [University Medical Center, Radiology, Regensburg (Germany)

    2015-09-15

    To evaluate the effect of an age-dependent D-Dimer cut-off in patients who underwent a computed tomography pulmonary angiogram (CTPA) for suspected pulmonary embolism (PE). Retrospective application of an age-dependent D-dimer cut-off (age/100 in patients aged over 50) in 530 consecutive patients, both in- and outpatients, aged over 18, who underwent CTPA for suspected PE according to the guidelines. The application of an age-dependent D-dimer cut-off showed a now negative test-result in 17 of 530 patients (3.2 %). The proportion was 4.1 % (17 of 418) in patients aged over 50. None of these 17 cases was diagnosed with PE in CTPA, the false-negative rate was 0 %. The effect could be seen in outpatients (14 of 377 [3.7 %]) as well as in inpatients(3 of 153 [2.0 %]) with no statistically significant difference (p > 0.05). The application of an age-dependent D-dimer cut-off as part of the guideline-based algorithm for suspected PE reduced the number of necessary CTPA in outpatients as well as in inpatients.

  9. Removal of methadone by extended dialysis using a high cut-off dialyzer: implications for the treatment of overdose and for pain management in patients undergoing light chain removal.

    Science.gov (United States)

    Arelin, Viktor; Schmidt, Julius J; Kayser, Nathalie; Kühn-Velten, W Nikolaus; Suhling, Hendrik; Eden, Gabriele; Kielstein, Jan T

    2016-06-01

    The synthetic opioid methadone hydrochloride has a low molecular weight of 346 D, a high volume of distribution (4 - 7 L/kg), and is lipophilic. It is used as an analgesic and for the maintenance treatment of opiate dependence. In drug addicts, methadone is frequently involved in mixed intoxications that can lead to death. Here we present the case of a drug addict in whom a high cut-off dialysis membrane together with extended dialysis was used in the setting of suspected overdose and acute kidney injury. Although the observed dialyzer plasma clearance (31.5 mL/min) and reduction ratio (38%) were higher than previously reported for standard hemodialysis, the total amount of methadone in the spent dialysate after 1 extended dialysis session was quite low. Hence, even extended dialysis with a high cut-off membrane does not seem to offer a clinically relevant benefit in the setting of overdose for enhanced methadone removal. On the other hand, in patients undergoing high cut-off dialysis for the removal of light chains, methadone could still be used as an analgesic without an additional dose after high cut-off hemodialysis. PMID:27116939

  10. Optimal cut-off of homeostasis model assessment of insulin resistance (HOMA-IR for the diagnosis of metabolic syndrome: third national surveillance of risk factors of non-communicable diseases in Iran (SuRFNCD-2007

    Directory of Open Access Journals (Sweden)

    Rashidi Armin

    2010-04-01

    Full Text Available Abstract Aim We have recently determined the optimal cut-off of the homeostatic model assessment of insulin resistance for the diagnosis of insulin resistance (IR and metabolic syndrome (MetS in non-diabetic residents of Tehran, the capital of Iran. The aim of the present study is to establish the optimal cut-off at the national level in the Iranian population with and without diabetes. Methods Data of the third National Surveillance of Risk Factors of Non-Communicable Diseases, available for 3,071 adult Iranian individuals aging 25-64 years were analyzed. MetS was defined according to the Adult Treatment Panel III (ATPIII and International Diabetes Federation (IDF criteria. HOMA-IR cut-offs from the 50th to the 95th percentile were calculated and sensitivity, specificity, and positive likelihood ratio for MetS diagnosis were determined. The receiver operating characteristic (ROC curves of HOMA-IR for MetS diagnosis were depicted, and the optimal cut-offs were determined by two different methods: Youden index, and the shortest distance from the top left corner of the curve. Results The area under the curve (AUC (95%CI was 0.650 (0.631-0.670 for IDF-defined MetS and 0.683 (0.664-0.703 with the ATPIII definition. The optimal HOMA-IR cut-off for the diagnosis of IDF- and ATPIII-defined MetS in non-diabetic individuals was 1.775 (sensitivity: 57.3%, specificity: 65.3%, with ATPIII; sensitivity: 55.9%, specificity: 64.7%, with IDF. The optimal cut-offs in diabetic individuals were 3.875 (sensitivity: 49.7%, specificity: 69.6% and 4.325 (sensitivity: 45.4%, specificity: 69.0% for ATPIII- and IDF-defined MetS, respectively. Conclusion We determined the optimal HOMA-IR cut-off points for the diagnosis of MetS in the Iranian population with and without diabetes.

  11. Logarithmic Entropy-Corrected Holographic Dark Energy in Hořava-Lifshitz cosmology with Granda-Oliveros cut-off

    Science.gov (United States)

    Pasqua, Antonio; Chattopadhyay, Surajit

    2013-12-01

    In this work, we studied the Logarithmic Entropy-Corrected Holographic Dark Energy (LECHDE) model in a spatially non-flat universe and in the framework of Hořava-Lifshitz cosmology. As infrared cutoff of the system we considered the cut-off recently proposed by Granda and Oliveros which contains two terms, one proportional to H 2 and one to . For the two cases containing non-interacting and interacting Dark Energy (DE) and Dark Matter (DM), we obtained the exact differential equation that determines the evolution of the density parameter. Moreover, we derived the expressions of the deceleration parameter q and, using a parametrization of the equation of state (EoS) parameter ω D of our model as ω D ( z)= ω 0+ ω 1 z, we derived both the expressions of ω 0 and ω 1 for both non-interacting and interacting cases. All derivations made in this work are done in small redshift approximation and for low redshift expansion of the equation of state (EoS) parameter.

  12. UV Filtering of Dye-Sensitized Solar Cells: The Effects of Varying the UV Cut-Off upon Cell Performance and Incident Photon-to-Electron Conversion Efficiency

    Directory of Open Access Journals (Sweden)

    Matthew Carnie

    2012-01-01

    Full Text Available With current technology, UV filters are essential to ensure long-term dye-sensitized solar cell (DSC stability. Blocking photons, however, will have an obvious effect on device performance and upon its incident photon-to-current conversion efficiency (IPCE. Filters have been applied to DSC devices with a range of cut-off wavelengths in order to assess how different levels of filtering affect the performance and IPCE of devices made with three different dyes, namely N719, Z907, and N749. It is shown that dyes that extend their IPCE further into the NIR region suffer lesser relative efficiency losses due to UV filtering than dyes with narrower action spectra. Furthermore, the results are encouraging to those working towards the industrialisation of DSC technology. From the results presented it can be estimated that filtering at a level intended to prevent direct band gap excitation of the TiO2 semiconductor should cause a relative drop in cell efficiency of no more than 10% in forward illuminated devices and no more than 2% in reverse illuminated devices.

  13. Evaluation of epidemiological cut-off values indicates that biocide resistant subpopulations are uncommon in natural isolates of clinically-relevant microorganisms.

    Directory of Open Access Journals (Sweden)

    Ian Morrissey

    Full Text Available To date there are no clear criteria to determine whether a microbe is susceptible to biocides or not. As a starting point for distinguishing between wild-type and resistant organisms, we set out to determine the minimal inhibitory concentration (MIC and minimal bactericidal concentration (MBC distributions for four common biocides; triclosan, benzalkonium chloride, chlorhexidine and sodium hypochlorite for 3319 clinical isolates, with a particular focus on Staphylococcus aureus (N = 1635 and Salmonella spp. (N = 901 but also including Escherichia coli (N = 368, Candida albicans (N = 200, Klebsiella pneumoniae (N = 60, Enterobacter spp. (N = 54, Enterococcus faecium (N = 53, and Enterococcus faecalis (N = 56. From these data epidemiological cut-off values (ECOFFs are proposed. As would be expected, MBCs were higher than MICs for all biocides. In most cases both values followed a normal distribution. Bimodal distributions, indicating the existence of biocide resistant subpopulations were observed for Enterobacter chlorhexidine susceptibility (both MICs and MBCs and the susceptibility to triclosan of Enterobacter (MBC, E. coli (MBC and MIC and S. aureus (MBC and MIC. There is a concern on the potential selection of antibiotic resistance by biocides. Our results indicate however that resistance to biocides and, hence any potential association with antibiotic resistance, is uncommon in natural populations of clinically relevant microorganisms.

  14. Water cut-off construction for bulkhead of very deep waste treatment plant using premixed cohesive soil. Premix nenseido ni yoru daisuishin haikibutsu shorijo gogan no shisuiko

    Energy Technology Data Exchange (ETDEWEB)

    Iida, I. (Toa Corp., Tokyo (Japan))

    1994-03-25

    Recently waste treatment plants have been developed in the suburban coastal area or off shore, requiring controlled-type revetment or reclamation for the circumferential sea area. This report describes the outline of premix water cutoff construction having been applied to the center-partitioned revetment in the reclaiming construction work in Minami-Honmoku Pier Area, Yokohama. The premix water cut-off method is a construction method where packed sediment is mixed with a small amount of cement and a separation-preventive agent and then is thrown to develop ground. This time, to effectively re-use dredged soil and cohesive soil, these soils were mixed with a caking agent and placed onto the sea floor. The total length of construction was ca. 450m; the maximum water depth was 30m; and the placed amount was 79705m[sup 3]. Four 50m[sup 3]/h-class mud treating machines were mounted on two ships, to which a slurry plant ship and a mud treating plant were joined to make-up a fleet. The forced pump feed method was adopted for placing and construction was completed with a control system perfect in workmanship and quality. 15 figs., 6 tabs.

  15. Near-elliptic core triangular-lattice and square-lattice PCFs: a comparison of birefringence, cut-off and GVD characteristics towards fiber device application

    CERN Document Server

    Maji, Partha Sona

    2014-01-01

    In this work, detailed numerical analysis of the near-elliptic core index-guiding triangular-lattice and square-lattice photonic crystal fiber (PCFs) are reported for birefringence, single mode, cut-off behavior, group velocity dispersion and effective area properties. For the same relative values of d/P, triangular-lattice PCFs show higher birefringence whereas the square-lattice PCFs show a wider range of single-mode operation. Square-lattice PCF was found to be endlessly single-mode for higher air-filling fraction (d/P). Smaller lengths of triangular-lattice PCF are required for dispersion compensation whereas PCFs with square-lattice with nearer relative dispersion slope (RDS) can better compensate the broadband dispersion. Square-lattice PCFs show ZDW red-shifted, making it preferable for mid-IR supercontinuum generation (SCG) with highly non-linear chalcogenide material. Square-lattice PCFs show higher dispersion slope that leads to compression of the broadband, thus accumulating more power in the pulse...

  16. Cement/bentonite interaction. Results from 16 month laboratory tests

    International Nuclear Information System (INIS)

    The work concerns possible bentonite clay mineral alteration in constructions with bentonite in close contact with cement, and the effect of such changes on bentonite buffer properties. The investigation comprises a 16 months laboratory test series with hydrothermal cell tests, percolation tests and diffusion tests. MX-80 Wyoming bentonite was used in all tests. Two types of artificial cement pore water solutions were used in the percolation and diffusion tests. The swelling pressure and the hydraulic conductivity were measured continuously in the percolation tests. After termination, the clay was analyzed with respect to changes in element distribution, mineralogy and shear strength. The water solutions were analyzed with respect to pH, cations and major anions. The results concerning chemical and mineralogical changes are in summary: Ion exchange in the montmorillonite until equilibrium with cement pore-water ions was reached; Increase in cation exchange capacity; Dissolution of original cristobalite; Increase in quartz content; Minor increase in illite content; Minor formation of chlorite; Formation of CSH(I); Wash away of CSH-gel into surrounding water. A large decrease in swelling pressure and a moderate increase in hydraulic conductivity were recorded in the samples percolated by SULFACEM pore-water solution. The mineralogical alterations only concerned a minor part of the total bentonite mass and the changes in physical properties were therefore most likely due to the replacement of the original charge balancing cation by cement pore-water cations. Comparisons between the current test result and results from 4 month tests indicate that the rates of illite and chlorite formation were reduced during the tests. The presence of zeolites in the clay could not be ensured. However, the discovery of CSH material is important since CSH is expected to precede the formation of zeolites

  17. Comparing the Cervista HPV HR test and Hybrid Capture 2 assay in a Dutch screening population: improved specificity of the Cervista HPV HR test by changing the cut-off.

    Directory of Open Access Journals (Sweden)

    Aniek Boers

    Full Text Available The diagnostic performance of the widely-used Cervista HPV HR test was compared to the Hybrid Capture 2 (HC2 test in a Dutch population-based cervical cancer screening program. In 900 scrapings of women with normal cytomorphology, specificity was 90% (95%CI: 87.84-91.87 for the Cervista HPV HR test and 96% (95%CI: 94.76-97.37 for the HC2 test with 93% agreement between both tests (κ = 0.5, p<0.001. The sensitivity for CIN2+ using 65 scrapings of women with histological-confirmed CIN2+ was 91% (95%CI: 80.97-96.51 for the Cervista HPV HR test and 92% (95%CI: 82.94-97.43 for the HC2 test with 95% agreement between both tests (κ = 0.7, p<0.001. Fifty-seven of 60 HC2 negative/Cervista positive cases tested HPV-negative with PCR-based HPV assays; of these cases 56% were defined as Cervista triple-positive with FOZ values in all 3 mixes higher than the second cut-off of 1.93 (as set by manufacturer. By setting this cut-off at 5.0, specificity improved significantly without affecting sensitivity. External validation of this new cut-off at 5.0 in triple-positive scrapings of women selected from the SHENCCASTII database revealed that 22/24 histological normal cases now tested HPV-negative in the Cervista HPV HR test, while CIN2+ lesions remained HPV-positive. The intra-laboratory reproducibility of the Cervista HPV HR test (n = 510 showed a concordance of 92% and 93% for cut-off 1.93 and 5.0 (κ = 0.83 and κ = 0.84, p<0.001 and inter-laboratory agreement of the Cervista HPV HR test was 90% and 93% for cut-off 1.93 and 5.0 (κ = 0.80 and κ = 0.85, p<0.001. In conclusion, the specificity of the Cervista HPV HR test could be improved significantly by increasing the second cut-off from 1.93 to 5.0, without affecting the sensitivity of the test in a population-based screening setting.

  18. Specific cut-off points for waist circumference and waist-to-height ratio as predictors of cardiometabolic risk in Black subjects: a cross-sectional study in Benin and Haiti

    Directory of Open Access Journals (Sweden)

    EL Mabchour A

    2015-10-01

    Full Text Available Asma EL Mabchour,1 Hélène Delisle,1 Colette Vilgrain,2 Philippe Larco,2 Roger Sodjinou,3 Malek Batal1 1Transition Nutritionnelle (TRANSNUT, WHO Collaborating Centre on Nutrition Changes and Development, Department of Nutrition, Faculty of Medicine, University of Montreal, Montreal, QC, Canada; 2Haitian Foundation for Diabetes and Cardiovascular Diseases (FHADIMAC, Port-au-Prince, Haiti; 3West Africa Health Organization (WAHO, Bobo-Dioulasso, Burkina Faso Purpose: Waist circumference (WC and waist-to-height ratio (WHtR are widely used as indicators of abdominal adiposity and the cut-off values have been validated primarily in Caucasians. In this study we identified the WC and WHtR cut-off points that best predicted cardiometabolic risk (CMR in groups of African (Benin and African ancestry (Haiti Black subjects. Methods: This cross-sectional study included 452 apparently healthy subjects from Cotonou (Benin and Port-au-Prince (Haiti, 217 women and 235 men from 25 to 60 years. CMR biomarkers were the metabolic syndrome components. Additional CMR biomarkers were a high atherogenicity index (total serum cholesterol/high density lipoprotein cholesterol ≥4 in women and ≥5 in men; insulin resistance set at the 75th percentile of the calculated Homeostasis Model Assessment index (HOMA-IR; and inflammation defined as high-sensitivity C-reactive protein (hsCRP concentrations between 3 and 10 mg/L. WC and WHtR were tested as predictors of two out of the three most prevalent CMR biomarkers. Receiver operating characteristic (ROC curves, Youden's index, and likelihood ratios were used to assess the performance of specific WC and WHtR cut-offs. Results: High atherogenicity index (59.5%, high blood pressure (23.2%, and insulin resistance (25% by definition were the most prevalent CMR biomarkers in the study groups. WC and WHtR were equally valid as predictors of CMR. Optimal WC cut-offs were 80 cm and 94 cm in men and women, respectively, which is exactly

  19. Cut off from supplies - sulfate exhaustion and implications for methane emissions in a brackish rewetted peatland after separation from the coast

    Science.gov (United States)

    Koebsch, Franziska; Liu, Bo; Schmiedinger, Iris; Spitzy, Alejandro; Köhler, Stefan; Koch, Marian; Jurasinski, Gerald; Gehre, Matthias; Sachs, Torsten; Böttcher, Michael

    2016-04-01

    Coastal ecosystems are at the interface between marine and freshwater and exhibit a special geochemistry. We investigate the S and C geochemistry of a coastal, degraded fen peatland. The site has been cut off from the Baltic Sea since 1995 and was rewetted with freshwater from the surrounding catchment in 2010. Despite of locally high pore water sulfate (SO42-) concentrations, the fen turned into a strong source for methane (CH4) with annual budgets up to 0.26±0.06 kg m-2 (Hahn et al. 2015). To reconcile this apparent contradiction we use concentration patterns and stable isotope signatures of water, SO42-, pyrite, dissolved carbon, and CH4 (δ2H, δ13C, δ18O, δ34S) along a transect with increasing distance to the Baltic coastline (300-1500 m). The current peatland geochemistry is characterized by a combination of relict signals reflecting former brackish water intrusion events and indicators of recent human activities such as internal eutrophication and increasing freshwater contribution. The shallow peat layer (depth mostly ≤ 55 cm) exhibited a pronounced vertical gradient with a freshwater-front lying on top of the brackish water layer. S geochemistry was decoupled from present brackish water distribution as marine SO42- was almost completely biotically reduced and converted to pyrite. The remaining pore water SO42- pool was remarkably 34S-enriched in relation to Baltic Sea SO42- (up to +86.4 and +21‰, respectively) and also δ34S-values of pyrite were comparatively high (+4.8‰), thereby demonstrating a distinct reservoir effect under closed-system conditions. However, one of the profiles situated 1150 m from the Baltic Sea coast line exhibited a contrasting S pattern with pronounced excess of isotopically lighter SO42- at depth (up to 32.8 mM and +22.7‰). We hypothesize, that local groundwater seeps might provide electron acceptors such as NO3- for the contemporary oxidation of pyrite. δ13C in DIC exhibited a pronounced vertical shift from -23.9

  20. Anti-mullerian hormone cut-off values for predicting poor ovarian response to exogenous ovarian stimulation in in-vitro fertilization

    Directory of Open Access Journals (Sweden)

    Ruma Satwik

    2012-01-01

    Full Text Available Objectives: (a To establish the cut-off levels for anti-Mullerian hormone (AMH in a population of Indian women that would determine poor response. (b To determine which among the three ie.,: age, follicle stimulating hormone (FSH, or AMH, is the better determinant of ovarian reserve. Study Design: Prospective observational study. Setting: In vitro fertilization (IVF unit of a tertiary hospital. Materials and Methods: The inclusion criterion was all women who presented to the center for in-vitro fertilization/Intracytoplasmic sperm injection (IVF/ICSI. The exclusion criteria were age >45 years, major medical illnesses precluding IVF or pregnancy, FSH more than 20 IU/L, and failure to obtain consent. The interventions including baseline pelvic scan, day 2/3 FSH, luteinizing hormone (LH, estradiol estimations, and AMH measurement on any random day of cycle were done. Subjects underwent IVF according to long agonist or antagonist protocol regimen. Oocyte recovery was correlated with studied variables. The primary outcome measure was the number of oocytes aspirated (OCR. Three categories of ovarian response were defined: poor response, OCR ≤ 3; average response, OCR between 4 and 15; hyperresponse, OCR > 15. Results: Of the 198 patients enrolled, poor, average, and hyperresponse were observed in 23%, 63%, and 14% respectively. Correlation coefficient for AMH with ovarian response was r = 0.591. Area under the curve (AUCs for poor response for AMH, subject′s age, and FSH were 0.768, 0.624, and 0.635, respectively. The discriminatory level of AMH for prediction of absolute poor response was 2 pmoL/l, with 98% specificity and 20% sensitivity. Conclusions: AMH fares better than age and FSH in predicting the overall ovarian response and poor response, though it cannot be the absolute predictor of non-responder status. A level of 2 pmol/l is discriminatory for poor response.

  1. The impact of cut-off lows on ozone in the upper troposphere and lower stratosphere over Changchun from ozonesonde observations

    Science.gov (United States)

    Song, Yushan; Lü, Daren; Li, Qian; Bian, Jianchun; Wu, Xue; Li, Dan

    2016-02-01

    In situ measurements of the vertical structure of ozone were made in Changchun (43.53°N, 125.13°E), China, by the Institute of Atmosphere Physics, in the summers of 2010-13. Analysis of the 89 validated ozone profiles shows the variation of ozone concentration in the upper troposphere and lower stratosphere (UTLS) caused by cut-off lows (COLs) over Changchun. During the COL events, an increase of the ozone concentration and a lower height of the tropopause are observed. Backward simulations with a trajectory model show that the ozone-rich airmass brought by the COL is from Siberia. A case study proves that stratosphere-troposphere exchange (STE) occurs in the COL. The ozone-rich air mass transported from the stratosphere to the troposphere first becomes unstable, then loses its high ozone concentration. This process usually happens during the decay stage of COLs. In order to understand the influence of COLs on the ozone in the UTLS, statistical analysis of the ozone profiles within COLs, and other profiles, are employed. The results indicate that the ozone concentrations of the in-COL profiles are significantly higher than those of the other profiles between ±4 km around the tropopause. The COLs induce an increase in UTLS column ozone by 32% on average. Meanwhile, the COLs depress the lapse-rate tropopause (LRT)/dynamical tropopause height by 1.4/1.7 km and cause the atmosphere above the tropopause to be less stable. The influence of COLs is durable because the increased ozone concentration lasts at least one day after the COL has passed over Changchun. Furthermore, the relative coefficient between LRT height and lower stratosphere (LS) column ozone is -0.62, which implies a positive correlation between COL strength and LS ozone concentration.

  2. Impact of High-Cut-Off Dialysis on Renal Recovery in Dialysis-Dependent Multiple Myeloma Patients: Results from a Case-Control Study.

    Directory of Open Access Journals (Sweden)

    Hans U Gerth

    Full Text Available High-cut-off hemodialysis (HCO-HD can effectively reduce high concentrations of circulating serum free light chains (sFLC in patients with dialysis-dependent acute kidney injury (AKI due to multiple myeloma (MM. Therefore, the aim of this study was to analyze renal recovery in a retrospective single-center cohort of dialysis-dependent MM patients treated with either conventional HD (conv. HD or HCO-HD.The final cohort consisted of 59 patients treated with HCO-HD (n = 42 or conv. HD (n = 17. A sustained sFLC response was detected in a significantly higher proportion of HCO-HD patients (83.3% compared with conv. HD patients (29.4%; p = 0.007. The median duration of sFLC required to reach values <1000 mg/l was 14.5 days in the HCO-HD group and 36 days in the conv. HD group. The corresponding rates of renal recovery were 64.3% and 29.4%, respectively (chi-squared test, p = 0.014. Multivariate regression and decision tree analysis (recursive partitioning revealed HCO-HD (adjusted odds ratio [OR] 6.1 [95% confidence interval (CI 1.5-24.5], p = 0.011 and low initial uric acid values (adjusted OR 1.3 [95%CI 1.0-1.7], p = 0.045 as independent and paramount variables associated with a favorable renal outcome.In summary, the results from this retrospective case-control study suggest in addition to novel agent-based chemotherapy a benefit of HCO-HD in sFLC removal and renal outcome in dialysis-dependent AKI secondary to MM. This finding was especially pertinent in patients with low initial uric acid values, resulting in a promising renal recovery rate of 71.9%. Further prospective studies are warranted.

  3. Exploration of cut-off value of TSH during screening of congenital hypothyroidism in the newborns%新生儿先天性甲状腺功能减退症筛查中TSH切值的探讨

    Institute of Scientific and Technical Information of China (English)

    陈肖肖; 秦玉峰; 曲一平; 毛华庆; 施玉华; 赵正言

    2008-01-01

    新生儿筛查中发现,TSH水平与先天性甲状腺功能减退症(CH)检出率呈直线正相关.当TSH切值点分别为9、10、15和20 mU/L时,CH阳性检测敏感度分别 99.77%、96.80%、81.25%和71.88%.TSH>9 mU/L是较好的切点.%Positive linear correlation was found between TSH level and detection rate of congenital hypothyroidism (CH). When measured with a cut-off point at 9, 10, 15 and 20 mU/L of TSH, the sensitivity of positive detection rate for CH was 99.77%, 96.80%, 81.25% and 71.88%, respectively. TSH > 9 mU/L seems to be a reasonable cut-off value.

  4. Glycolipid metabolic status of overweight/obese adolescents aged 9- to 15-year-old and the BMI-SDS/BMI cut-off value of predicting dyslipidemiain boys, Shanghai, China: a cross-sectional study

    OpenAIRE

    Gong, Chun-dan; Wu, Qiao-ling; Chen, Zheng; Zhang, Dan; Zhao, Zheng-yan; Peng, Yong-mei

    2013-01-01

    Background The prevalence of adolescents’ obesity and overweight has dramatically elevated in China. Obese children were likely to insulin resistance and dyslipidemia, which are risk factors of cardiovascular diseases. However there was no cut-off point of anthropometric values to predict the risk factors in Chinese adolescents. The present study was to investigate glycolipid metabolism status of adolescents in Shanghai and to explore the correlations between body mass index standard deviatio...

  5. Modeling and simulation of dual three phase induction machine in fault condition (two phase cut off) and propose a new approach of R.F.O vector control approach for torque oscillation reducing in fault mode

    Energy Technology Data Exchange (ETDEWEB)

    Milli Monfared, J.; Abbaszadeh, K.; Fallah, E. [Amirkabir Univ. of Technology, Tehran (Indonesia)

    2000-08-01

    From the energy conversion point of view, structure of all electrical machines can be simplified to an equivalent two-phase machine. At normal operation this equivalent machine has a balanced structure which is the base of vector control equations at this mode. Similarly at phase - cut off condition this equivalent model has an unbalanced structure, which can be used to obtain vector control equations at this faulty mode. In this paper at first a dual three-phase induction machine has been modeled while two phase of stator is cut off, then vector control equations has been obtained from d-q model of machine. On the basis of these equations a new 'rotor field oriented control' approach is presented which indicate How the conventional R.F.0 control can be adapted with fault condition. Finally a computer simulation has been presented to compare the operation of conventional R.F.0 control with improved R.F.0 control, while two phase of machine is cut off. Results show considerable improvement in drive performance especially in torque oscillating reduction. (orig.)

  6. Optimal cut-off point of BMI on age at menarche among Han nationality girls%汉族女生月经初潮年龄BMI最佳临界值研究

    Institute of Scientific and Technical Information of China (English)

    张敏婕; 朱丁; 徐勇; 沈惠芬; 钱红丹

    2011-01-01

    Objective To analyze body mass index (BMI) and weight by using receiver operating curve(ROC) among girls of Han nationality, and to find the optimal cut-off point of BMI on age at menarche. Methods With the stratified cluster sampling, 10-14 years old Chinese girls were questionnaired. Both retrospective and prospective ways were used to investigate the age at menarche. Questionnaire also included the students' age at menarche, height and weight. Then the ROC was operated to analyze the areas under curve(ADC) and the sensitivity and specificity of optimal cut-off point of BMI and weight were calculated. Results The average age of menarche was 12.26, the AUC of BMI and weight were 0.68 and 0. 73. The optimal cut-off point of weight on different age groups were different, but the optimal cut-off point of BMI on age at menarche tended to be uniform. Conclusion The optimal cut-off point of BMI is applicable in predicting the age of menarche, and more verification should be carried out in the future when applying this optimal cut-off point.%目的 应用受试者工作特征ROC曲线分析BMI、体重曲线下面积,探讨女性月经初潮BMI的最佳临界值.方法 采用分层整群抽样方法,对无锡市10~14岁7 300名汉族女生进行问卷调杳,了解月经初潮年龄及身高、体重.绘制ROC曲线,观察曲线下面积,计算BMI、体重最佳临界值的灵敏度和特异度.结果 女生月经来潮率为40.45% (2 953/7 300),月经初潮平均年龄为12.26岁;不同年龄组已潮组和未潮组女生体重、BMI差异均有统计学意义(P值均<0.05).BMI、体重的ROC曲线下面积分别为0.68和0.73;不同年龄组女生体重有不同的最佳临界值,但不同年龄组BMI最佳临界值趋于一致.结论BMI最佳临界值对预测是否来潮有重要的应用价值,但其效果有待在实际应用中加以进一步验证.

  7. The Brazilian hazard-based cut-off criteria for pesticide registration: a critical appraisal / Critérios de exclusão baseados em perigo adotados no Brasil para registro de pesticidas: Uma avalição crítica

    OpenAIRE

    Francisco José Roma Paumgartten

    2013-01-01

    Brazil, the world’s top consumer of agricultural pesticides, adopts a unique hazard-based cut-off approach to pesticide registration. Cut-off criteria for mutagenicity, carcinogenicity, teratogenicity, hormonal disturbances and damage to reproductive organs were introduced by the Pesticide Law enacted in 1989. As far as health is concerned, law enforcement is additionally regulated by rules issued by the federal health authority (National Agency for Health Surveillance – ANVISA). Contrasting ...

  8. 18F-FDG PET/CT for detection of malignant peripheral nerve sheath tumours in neurofibromatosis type 1: tumour-to-liver ratio is superior to an SUVmax cut-off

    International Nuclear Information System (INIS)

    To evaluate the usefulness of normalising intra-tumour tracer accumulation on 18F-fluorodeoxyglucose (FDG) positron emission tomography/computed tomography (PET/CT) to reference tissue uptake for characterisation of peripheral nerve sheath tumours (PNSTs) in neurofibromatosis type 1 (NF1) compared with the established maximum standardised uptake value (SUVmax) cut-off of >3.5. Forty-nine patients underwent FDG PET/CT. Intra-tumour tracer uptake (SUVmax) was normalised to three different reference tissues (tumour-to-liver, tumour-to-muscle and tumour-to-fat ratios). Receiver operating characteristic (ROC) analyses were used out to assess the diagnostic performance. Histopathology and follow-up served as the reference standard. Intra-tumour tracer uptake correlated significantly with liver uptake (rs = 0.58, P = 0.016). On ROC analysis, the optimum threshold for tumour-to-liver ratio was >2.6 (AUC = 0.9735). Both the SUVmax cut-off value of >3.5 and a tumour-to-liver ratio >2.6 provided a sensitivity of 100 %, but specificity was significantly higher for the latter (90.3 % vs 79.8 %; P = 0.013). In patients with NF1, quantitative 18F-FDG PET imaging may identify malignant change in neurofibromas with high accuracy. Specificity could be significantly increased by using the tumour-to-liver ratio. The authors recommend further evaluation of a tumour-to-liver ratio cut-off value of >2.6 for diagnostic intervention planning. (orig.)

  9. {sup 18}F-FDG PET/CT for detection of malignant peripheral nerve sheath tumours in neurofibromatosis type 1: tumour-to-liver ratio is superior to an SUV{sub max} cut-off

    Energy Technology Data Exchange (ETDEWEB)

    Salamon, Johannes [University Medical Centre Hamburg-Eppendorf, Department of Diagnostic and Interventional Radiology, Hamburg (Germany); University Hospital Hamburg-Eppendorf, Department of Diagnostic and Interventional Radiology, Hamburg (Germany); Veldhoen, Simon [University Medical Centre Hamburg-Eppendorf, Department of Diagnostic and Interventional Radiology, Hamburg (Germany); University Medical Centre Wuerzburg, Department of Diagnostic and Interventional Radiology, Wuerzburg (Germany); Apostolova, Ivayla [Otto-von-Guericke University, Department of Radiology and Nuclear Medicine, Magdeburg (Germany); Bannas, Peter; Yamamura, Jin; Herrmann, Jochen; Adam, Gerhard; Derlin, Thorsten [University Medical Centre Hamburg-Eppendorf, Department of Diagnostic and Interventional Radiology, Hamburg (Germany); Friedrich, Reinhard E. [University Medical Centre Hamburg-Eppendorf, Department of Oral and Maxillofacial Surgery, Hamburg (Germany); Mautner, Victor F. [University Medical Centre Hamburg-Eppendorf, Department of Neurology, Hamburg (Germany)

    2014-02-15

    To evaluate the usefulness of normalising intra-tumour tracer accumulation on {sup 18}F-fluorodeoxyglucose (FDG) positron emission tomography/computed tomography (PET/CT) to reference tissue uptake for characterisation of peripheral nerve sheath tumours (PNSTs) in neurofibromatosis type 1 (NF1) compared with the established maximum standardised uptake value (SUVmax) cut-off of >3.5. Forty-nine patients underwent FDG PET/CT. Intra-tumour tracer uptake (SUVmax) was normalised to three different reference tissues (tumour-to-liver, tumour-to-muscle and tumour-to-fat ratios). Receiver operating characteristic (ROC) analyses were used out to assess the diagnostic performance. Histopathology and follow-up served as the reference standard. Intra-tumour tracer uptake correlated significantly with liver uptake (r{sub s} = 0.58, P = 0.016). On ROC analysis, the optimum threshold for tumour-to-liver ratio was >2.6 (AUC = 0.9735). Both the SUVmax cut-off value of >3.5 and a tumour-to-liver ratio >2.6 provided a sensitivity of 100 %, but specificity was significantly higher for the latter (90.3 % vs 79.8 %; P = 0.013). In patients with NF1, quantitative {sup 18}F-FDG PET imaging may identify malignant change in neurofibromas with high accuracy. Specificity could be significantly increased by using the tumour-to-liver ratio. The authors recommend further evaluation of a tumour-to-liver ratio cut-off value of >2.6 for diagnostic intervention planning. (orig.)

  10. Which are the cut-off values of 2D-Shear Wave Elastography (2D-SWE) liver stiffness measurements predicting different stages of liver fibrosis, considering Transient Elastography (TE) as the reference method?

    Energy Technology Data Exchange (ETDEWEB)

    Sporea, Ioan, E-mail: isporea@umft.ro; Bota, Simona, E-mail: bota_simona1982@yahoo.com; Gradinaru-Taşcău, Oana, E-mail: bluonmyown@yahoo.com; Şirli, Roxana, E-mail: roxanasirli@gmail.com; Popescu, Alina, E-mail: alinamircea.popescu@gmail.com; Jurchiş, Ana, E-mail: ana.jurchis@yahoo.com

    2014-03-15

    Introduction: To identify liver stiffness (LS) cut-off values assessed by means of 2D-Shear Wave Elastography (2D-SWE) for predicting different stages of liver fibrosis, considering Transient Elastography (TE) as the reference method. Methods: Our prospective study included 383 consecutive subjects, with or without hepatopathies, in which LS was evaluated by means of TE and 2D-SWE. To discriminate between various stages of fibrosis by TE we used the following LS cut-offs (kPa): F1-6, F2-7.2, F3-9.6 and F4-14.5. Results: The rate of reliable LS measurements was similar for TE and 2D-SWE: 73.9% vs. 79.9%, p = 0.06. Older age and higher BMI were associated for both TE and 2D-SWE with the impossibility to obtain reliable LS measurements. Reliable LS measurements by both elastographic methods were obtained in 65.2% of patients. A significant correlation was found between TE and 2D-SWE measurements (r = 0.68). The best LS cut-off values assessed by 2D-SWE for predicting different stages of liver fibrosis were: F ≥ 1: >7.1 kPa (AUROC = 0.825); F ≥ 2: >7.8 kPa (AUROC = 0.859); F ≥ 3: >8 kPa (AUROC = 0.897) and for F = 4: >11.5 kPa (AUROC = 0.914). Conclusions: 2D-SWE is a reliable method for the non-invasive evaluation of liver fibrosis, considering TE as the reference method. The accuracy of 2D-SWE measurements increased with the severity of liver fibrosis.

  11. Which are the cut-off values of 2D-Shear Wave Elastography (2D-SWE) liver stiffness measurements predicting different stages of liver fibrosis, considering Transient Elastography (TE) as the reference method?

    International Nuclear Information System (INIS)

    Introduction: To identify liver stiffness (LS) cut-off values assessed by means of 2D-Shear Wave Elastography (2D-SWE) for predicting different stages of liver fibrosis, considering Transient Elastography (TE) as the reference method. Methods: Our prospective study included 383 consecutive subjects, with or without hepatopathies, in which LS was evaluated by means of TE and 2D-SWE. To discriminate between various stages of fibrosis by TE we used the following LS cut-offs (kPa): F1-6, F2-7.2, F3-9.6 and F4-14.5. Results: The rate of reliable LS measurements was similar for TE and 2D-SWE: 73.9% vs. 79.9%, p = 0.06. Older age and higher BMI were associated for both TE and 2D-SWE with the impossibility to obtain reliable LS measurements. Reliable LS measurements by both elastographic methods were obtained in 65.2% of patients. A significant correlation was found between TE and 2D-SWE measurements (r = 0.68). The best LS cut-off values assessed by 2D-SWE for predicting different stages of liver fibrosis were: F ≥ 1: >7.1 kPa (AUROC = 0.825); F ≥ 2: >7.8 kPa (AUROC = 0.859); F ≥ 3: >8 kPa (AUROC = 0.897) and for F = 4: >11.5 kPa (AUROC = 0.914). Conclusions: 2D-SWE is a reliable method for the non-invasive evaluation of liver fibrosis, considering TE as the reference method. The accuracy of 2D-SWE measurements increased with the severity of liver fibrosis

  12. Predictive Values of Body Mass Index and Waist Circumference for Risk Factors of Certain Related Diseases in Chinese Adults - Study on Optimal Cut-off Points of Body Mass Index and Waist Circumference in Chinese Adults

    Institute of Scientific and Technical Information of China (English)

    2002-01-01

    For prevention of obesity in Chinese population, it is necessary to define the optimal range of healthy weight and the appropriate cut-off points of BMI and waist circumference for Chinese adults. The Working Group on Obesity in China under the support of International Life Sciences Institute Focal point in China organized a meta-analysis on the relation between BMI, waist circumference and risk factors of related chronic diseases (e. g.,high diabetes, diabetes mellitus, and lipoprotein disorders). Methods 13 population studies in all met the criteria for enrollment, with data of 239 972 adults (20-70 year) surveyed in the 1990s. Data on waist circumference was available for 111411 persons and data on serum lipids and glucose were available for more than 80 000. The study populations located in 21provinces, municipalities and autonomous regions in mainland China as well as in Taiwan. Each enrolled study provided data according to a common protocol and uniform format. The Center for data management in Department of Epidemiology, Fu Wai Hospital was responsible for statistical analysis. Results and conclusion The prevalence of hypertension, diabetes, dyslipidemia and clustering of risk factors all increased with increasing levels of BMI or waist circumference. BMI at 24 with best sensitivity and specificity for identification of the risk factors, was recommended as the cut-off point for overweight, BMI at 28 which may identify the risk factors with specificity around 90 % was recommended as the cut-off point for obesity. Waist circumference beyond 85 cm for men and beyond 80 cm for women were recommended as the cut-off points for central obesity.Analysis of population attributable risk percent illustrated that reducing BMI to normal range (<24) could prevent 45%-50% clustering of risk factors. Treatment of obese persons (BMI ≥ 28)with drugs could prevent 15%-17% clustering of risk factors. The waist circumference controlled under 85 cm for men and under 80 cm for

  13. Waterlow量表对重症患者压疮的预测价值及诊断界值分析%Predictive Value of Waterlow Scale for Pressure Ulcers for Critically Ill Patients and Its Cut-off Value

    Institute of Scientific and Technical Information of China (English)

    李晓艳; 赵小利; 韩娟; 石秦东; 李昊

    2015-01-01

    目的:界定Waterlow量表对重症患者压疮的预测价值及诊断界值。方法回顾性分析765例重症患者的压疮风险评估资料,使用受试者工作特征(ROC)曲线评价Waterlow量表的预测性能和最佳诊断界值。结果由ROC分析结果可知,Waterlow评分曲线下面积为0.694,与0.5相比,具有统计学意义(P<0.01)。 Waterlow量表分界值为20分时,其灵敏度(0.880)、特异度(0.480)具有最好的平衡性。结论 Waterlow量表在预测重症患者压疮中具有较高的灵敏度和特异度,可将分界值提高至20分。%Objective To explore the predictive value of Waterlow scale for pressure ulcers for critically ill patients and its cut-off value. Methods A retrospective analysis of evaluation data of pressure ulcer risk of 765 critically ill inpatients was conducted and predictive value and cut-off value of Waterlow scale was assessed by ROC (Receiver Operating Characteristic). Results ROC indicated that the area under curve was 0.694, which showed statistical significance ( P<0.01). When cut-off value of Waterlow sacle reached 20, the sensitivity (0.880) and specificity (0.480) of the scale reached a good balance. Conclusion Waterlow scale has high sensitivity and specificity in predicting pressure ulcers for critically ill patients and its cut-off value could be raised to 20.

  14. Test accuracy at different cut-offs when plasma concentrations of metabolic indicators are used to detect decreased fertility in dairy cows (Poster topic 01, Poster 27, p. 193)

    DEFF Research Database (Denmark)

    Lomander, H; Gustafsson, H; Svensson, C;

    and BHBA were calculated and compared to each cow’s fertility status, measured as anestrous (ANEST) and delayed first AI (DFAI). Positive and negative predictive values (PV+; PV-) were calculated considering different levels of decreased fertility. Strata-specific Se and Sp and associations between...... test results and fertility parameters were investigated using logistic regressio n. For this analysis, cut-offs with Sp ~80% was used because a high Sp was considered of interest. This corresponded to a NEFA-cutoff at 400 µeqv./mL (Se≤0.44) and a BHBA-cut-off at 1.8 mM (Se ≤0.32). Sp was generally...... higher when the test was used in heifers compared to older cows. With a prevalence of ANEST of 28% PV+ were 0.25 and PV- nearly 0.90. With a DFAI prevalence of 35%, PV+ were <0.38 and PV- nearly 0.90. The results indicate that overall test performance is low when metabolic indicators measured 0-21 days...

  15. Thickness-Independent Ultrasonic Imaging Applied to Abrasive Cut-Off Wheels: An Advanced Aerospace Materials Characterization Method for the Abrasives Industry. A NASA Lewis Research Center Technology Transfer Case History

    Science.gov (United States)

    Roth, Don J.; Farmer, Donald A.

    1998-01-01

    Abrasive cut-off wheels are at times unintentionally manufactured with nonuniformity that is difficult to identify and sufficiently characterize without time-consuming, destructive examination. One particular nonuniformity is a density variation condition occurring around the wheel circumference or along the radius, or both. This density variation, depending on its severity, can cause wheel warpage and wheel vibration resulting in unacceptable performance and perhaps premature failure of the wheel. Conventional nondestructive evaluation methods such as ultrasonic c-scan imaging and film radiography are inaccurate in their attempts at characterizing the density variation because a superimposing thickness variation exists as well in the wheel. In this article, the single transducer thickness-independent ultrasonic imaging method, developed specifically to allow more accurate characterization of aerospace components, is shown to precisely characterize the extent of the density variation in a cut-off wheel having a superimposing thickness variation. The method thereby has potential as an effective quality control tool in the abrasives industry for the wheel manufacturer.

  16. Near horizon geometry, Brick wall model and the Entropy of a scalar field in the Reissner-Nordstrom black hole backgrounds

    International Nuclear Information System (INIS)

    In this article we will find the entropy of a scalar field in the Reissner-Nordstrom black hole backgrounds using the brick wall model of t' Hooft. We will use the semi-classical WKB approximation. We will consider the modes which are globally stationary so that the WKB quantization rule used in the brick wall model remains valid. In the Schwarzschild black hole this consideration had led to a new expression of the entropy different from the conventional expression which is inversely divergent in the brick wall cut-off parameter and in terms of a proper distance cut-off parameter, is proportional to the area of the event horizon. The new expression of the scalar field entropy obtained in this article is logarithmically divergent in the brick wall cut-off parameter and is not proportional to the area of the black hole event horizon. For the extremal Reissner-Nordstrom black hole background the entropy of the scalar field is again divergent in the brick wall cut-off parameter and vanishes if the temperature of the Hawking radiation and the black hole is taken to be zero. We will next consider the entropy for a thin shell of matter field surrounding the black hole horizon. When expressed in terms of a covariant cut-off parameter, the entropy of a thin shell of matter field surrounding the horizon in the non-extreme Reissner-Nordstrom black hole background is given by an expression proportional to the area of the black hole horizon. We will briefly explain the significance of this result.

  17. 四川省新生儿 CH筛查切值的探讨%Exploration of cut-off value of TSH during screening of congenital hypothyroidism in the newborns in Sichuan

    Institute of Scientific and Technical Information of China (English)

    周婧瑶; 欧明才; 罗晓菊; 张钰; 胡琦; 陈雪莲; 杨丽娟; 王蕊; 李婷

    2013-01-01

    目的:探讨四川省新生儿疾病筛查中心实验室先天性甲状腺功能减低症( CH)筛查切值,减少漏诊率,降低假阳性率。方法对四川省新生儿疾病筛查中心片区市县2011至2012年活产婴儿出生72小时并充分哺乳6次后取其足跟血,采用时间分辨荧光免疫法检测血中促甲状腺激素( TSH)浓度。结果2011至2012年度共测定525941例标本,其TSH浓度呈偏态分布,其中正常新生儿人数为525554,确诊CH患儿230例,高TSH血症患儿157例。当筛查切值定为8.0mIU/L和定为8.9mIU/L时,灵敏度χ2=10.188,P<0.05;特异度χ2=458.460,P<0.05,制定出四川省新生儿疾病筛查中心实验室时间分辨荧光免疫法筛查CH参考切值为8.0mIU/L。结论四川省新生儿疾病筛查中心制定的CH筛查切值是适宜的、有依据的,为更大规模开展的新生儿CH筛查提供了决策依据。%Objective To explore the positive cut-off value in neonatal screening for congenital hypothyroidism (CH) in the Centre of Neonatal Screening of Sichuan , so as to improve screening efficiency and reduce false positive rate .Methods DELFIA was applied to detect the concentration of thyroid-stimulating hormone ( TSH) in heel blood samples which were collected from the newborns 72 hours after birth and having drunk enough milk for at least 6 times.These neonates were born in 2011-2012 in counties and cities managed by the Centre of Neonatal Screening of Sichuan .Results Totally 525 941 blood samples were screened . The TSH concentration showed a skewed distribution .Among them 525 554 newborns were normal , 230 neonates were diagnosed with CH , and 157 with high TSH hyperlipidemia . When the positive cut-off value was 8.0mIU/L and 8.9mIU/L, the sensitivity χ2 was 10.188 ( P <0.05 ) and the specificity χ2 was 458.460 (P<0.05).The cut-off value of screening was 8.0mIU/L by DELFIA in the Centre of Neonatal Screening of Sichuan

  18. Prevalence of swallowing and speech problems in daily life after chemoradiation for head and neck cancer based on cut-off scores of the patient-reported outcome measures SWAL-QOL and SHI.

    Science.gov (United States)

    Rinkel, Rico N; Verdonck-de Leeuw, Irma M; Doornaert, Patricia; Buter, Jan; de Bree, Remco; Langendijk, Johannes A; Aaronson, Neil K; Leemans, C René

    2016-07-01

    The objective of this study is to assess swallowing and speech outcome after chemoradiation therapy for head and neck cancer, based on the patient-reported outcome measures Swallowing Quality of Life Questionnaire (SWAL-QOL) and Speech Handicap Index (SHI), both provided with cut-off scores. This is a cross-sectional study. Department of Otolaryngology/Head and Neck Surgery of a University Medical Center. Sixty patients, 6 months to 5 years after chemoradiation for head and neck squamous cell carcinoma. Swallowing Quality of Life Questionnaire (SWAL-QOL) and SHI, both validated in Dutch and provided with cut-off scores. Associations were tested between the outcome measures and independent variables (age, gender, tumor stage and site, and radiotherapy technique, time since treatment, comorbidity and food intake). Fifty-two patients returned the SWAL-QOL and 47 the SHI (response rate 87 and 78 %, respectively). Swallowing and speech problems were present in 79 and 55 %, respectively. Normal food intake was noticed in 45, 35 % had a soft diet and 20 % tube feeding. Patients with soft diet and tube feeding reported more swallowing problems compared to patients with normal oral intake. Tumor subsite was significantly associated with swallowing outcome (less problems in larynx/hypopharynx compared to oral/oropharynx). Radiation technique was significantly associated with psychosocial speech problems (less problems in patients treated with IMRT). Swallowing and (to a lesser extent) speech problems in daily life are frequently present after chemoradiation therapy for head and neck cancer. Future prospective studies will give more insight into the course of speech and swallowing problems after chemoradiation and into efficacy of new radiation techniques and swallowing and speech rehabilitation programs. PMID:26071622

  19. Membrane molecular weight cut off impacts immunological safety of a novel bioartificial liver system%膜截流分子量在新型生物人工肝免疫安全性中的作用研究

    Institute of Scientific and Technical Information of China (English)

    张悦; 施晓雷; 韩冰; 顾劲扬; 褚薛慧; 肖江强; 任昊桢; 檀家俊; 丁义涛

    2012-01-01

    Objective To investigate the influence of membrane molecular weight cut off in our bioartificial liver(BAL)system.Methods Beagle dogs were used for a model of acute liver failure through D-galactosamine administration.The acute liver failure Beagles were divided into two groups by the membrane molecular weight cut off.Group A was treated with BAL containing 200 kDa retention rating membrane.Group B was treated with BAL containing 1200 kDa retention rating membrane.Each group underwent two six-hour BAL treatments that were performed on day 1 and day 21.BAL medium were examined and levels of IgG,IgM,and complement hemolytic unit of 50%(CH50)antibodies were measured in all Beagles and.Results BAL treatment was associated with a significant decline in levels of CH50.1200 kDa group experienced a significant increase in levels of IgG and IgM after two BAL treatments.Significant levels of canine proteins were detected in BAL medium from 1200 kDa group.Conclusions Xenogeneic immune response in the BAL system was influenced by membrane molecular weight cut off.%目的 探讨膜截流分子量对新型生物人工肝(bioartificial liver,BAL)支持系统免疫安全性的影响.方法 应用D氨基半乳糖静脉滴注比格犬建立肝功能衰竭模型.急性肝功能衰竭犬根据BAL隔离膜截流分子量的大小分为两组:A组:200 kD组;B组:1200 kD组.两组均接受新型2次BAL治疗,每次6h.观察各组体内IgG、IgM、50%补体溶血单位(CH50)变化及反应器内抗体漏过情况.结果 在第一次BAL治疗后两组的IgG和IgM水平均没有发生明显的变化.在第2次治疗后第7天,1200 kD组的IgG和IgM水平明显升高,200 kD组IgG和IgM水平仍未出现明显上升或下降.在第一次BAL治疗后,两组CH50都出现暂时性的下降,在治疗后1h达到最低值,而后缓步上升,在7d后恢复至治疗前水平.反应器内培养液中IgG、IgM及CH50检测结果显示,1200 kD组在治疗结束后IgG、IgM及CH50

  20. 应用ROC曲线评价癌症患者心理压力量表的临界值研究%Using ROC curve to evaluate cut-off points of Psychological Distress Scale of Cancer Patients

    Institute of Scientific and Technical Information of China (English)

    张丽燕; 陆宇晗

    2016-01-01

    目的:应用ROC曲线测定癌症患者心理压力量表各维度的临界值,为临床应用提供依据。方法调查北京肿瘤医院的癌症患者364例,填写癌症患者心理压力量表和症状自评量表(SCL-90),应用ROC曲线探索此量表各维度的临界值。结果以SCL-90相应维度为参照标准,癌症患者心理压力量表各维度ROC曲线下面积分别为:焦虑(0.815,P<0.01),抑郁(0.790,P<0.01),人际障碍(0.829,P<0.01),怀疑(0.670,P<0.01)。各维度在以下临界值时可获得最佳的敏感性和特异性:焦虑11分,抑郁14分,人际障碍7分,怀疑4分。结论癌症患者心理压力量表对焦虑、抑郁、人际障碍有较好的诊断价值,对怀疑的诊断价值较弱。它具有较好的诊断价值,有助于临床进行癌症患者的心理问题评价。%Objective To determine the cut-off points of Psychological Distress Scale of Cancer Patients by using the ROC curve, in order to provide reference for clinical application of it. Methods A questionnaire containing both the Psychological Distress Scale of Cancer Patients and Symptom Checklist-90 (SCL-90) were filled by 364 cancer patients in Beijing Cancer Hospital. Later the cut-off points of the four latitudes of the Scale were evaluated by ROC curve through comparing the two scales. Results By using the latitudes of the SCL-90 scale as a reference, the areas of all the four latitudes of the Scale were:anxiety (0.815, P<0.01); depression (0.790, P<0.01); interpersonal disability (0.829, P<0.01);suspiciousness (0.670, P<0.01) respectively. The following cut-off points could result in the most ideal sensitivity and specificity: 11 for anxiety; 14 for depression; 7 for interpersonal disability and 4 for suspiciousness. Conclusions The Psychological Distress Scale of Cancer Patients can provide great values to the diagnosis of psychological problems related with anxiety, depression, and interpersonal

  1. Effect of Body Mass Index on All-cause Mortality and Incidence of Cardiovascular Diseases - Report for Meta-Analysis of Prospective Studies on Optimal Cut-off Points of Body Mass Index in Chinese Adults

    Institute of Scientific and Technical Information of China (English)

    2002-01-01

    Objective To verify the optimal cut-off points for overweight and obesity in Chinese adults based on the relationship of baseline body mass index (BMI) to all-cause mortality, and incidence of cardiovascular diseases from pooled data of Chinese cohorts. Methods The prospective study data of existing cohort studies in China were collected, and the age-adjusted all-cause mortality stratified by BMI were estimated. The similar analysis was repeated after excluding deaths within the first three years of follow-up and after excluding smokers. The incidence of age-adjusted coronary heart disease (CHD) and stroke stratified by BMI were also analyzed. Multiple Cox regression coefficients of BMI for the incidence of CHD and stroke after controlling other risk factors were pooled utilizing the methods of weighting by inverse of variance to reveal whether BMI had independent effect and its strength on the incidence of CHD and stroke. Results The data of 4 cohorts including 76 227persons, with 745 346 person-years of follow-up were collected and analyzed. The age-adjusted allcause mortality stratified by BMI showed a U-shaped curve, even after excluding deaths within the first three years of follow-up and excluding smokers. Age-adjusted all-cause mortality increased when BMI was lower than 18.5 and higher than 28. The incidence of CHD and stroke, especially ishemic stroke increased with increasing BMI, this was consistent with parallel increasing of risk factors. Cox regression analysis showed that BMI was an independent risk factor for both CHD and stroke. Each amount of 2 kg/m2 increase in baseline BMI might cause 15.4%, 6.1% and 18.8 % increase in relative risk of CHD, total stroke and ischemic stroke. Reduction of BMI to under 24 might prevent the incidence of CHD by 11% and that of stroke by15 % for men, and 22 % of both diseases for women. Conclusion BMI ≤18.5, 24-27.9 and ≥28 (kg/m2) is the appropriate cut-off points for underweight, overweight and obesity in

  2. A quasi-discreteness approximation is employed to study analytically spatially localized voltage oscillations in a discrete electrical lattice. We show that the system may support new types of gap solitons as well as upper cut-off solitons (intrinsic localized modes), both nonlinear localized modes having a zero group velocity

    International Nuclear Information System (INIS)

    A quasi-discreteness approximation is employed to study analytically spatially localized voltage oscillations in a discrete electrical lattice. We show that the system may support new types of gap solitons as well as upper cut-off solitons (intrinsic localized modes), both nonlinear localized modes having a zero group velocity. (author)

  3. Mineralogical and chemical-physical effects of hydrocarbon permeation in composite liners and cut-off walls. Final report; Mineralogische und chemisch-physikalische Auswirkungen der Permeation von Kohlenwasserstoffen in Kombinationsdichtungen und -dichtwaenden. Abschlussbericht

    Energy Technology Data Exchange (ETDEWEB)

    Kalbe, U.; Berger, W.; Mueller, W.; Brune, M.; Eckardt, J.; Tatzky-Gerth, R.; Ache, W.; Goebbels, J. [Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin (Germany); Breu, J.; Kerzdoerfer, H. [Regensburg Univ. (Germany). Inst. fuer Anorganische Chemie

    2000-05-31

    Composite liner systems (HDPE geomembrane and compacted mineral liner) are used in Germany in landfills and for the lining of contaminated sites according to the technical regulations. It is expected that these lining systems provide a highly efficient and reliable technical barrier for the long-term groundwater protection. To support these expectations and assess the performance of the liner system even under extreme conditions, various composite liner systems were exposed to a mixture of 9 liquid hydrocarbons and their permeation behaviour was studied in permeation cells over 12 years. The cells were now dismantled and changes in the liner materials were carefully measured and controlled. The following issues were pursued in the research project: - effect of long-term hydrocarbon permeation and immersion on the properties of the geomembrane, - determination of the vertical distribution of organic contaminants in the mineral liner, - changes in the mineralogical, micromorphological and soil mechanical properties of the mineral liner brought about by the contaminant mixture, - investigation of the influence of microbial activity on the mineral layer, - modelling of the pollutant transport in the composite liner system. Neither geomembrane nor most of the tested mineral liners exhibited significant changes. Hydrocarbon permeation was proved to have been substantially suppressed by the composite liner. (orig.) [German] Zur Sicherung von Deponien und Altlasten mit dem Ziel eines langfristig wirksamen Grundwasserschutzes werden seit Mitte der 80er Jahre Kombinationsdichtungen (Verbund aus Kunststoffdichtungsbahn und mineralischer Dichtschichten) eingesetzt. Um deren Langzeitbestaendigkeit auch unter extremen Bedingungen bewerten zu koennen, wurden Permeationsmesszellen, welche die Verhaeltnisse in der Deponie nachstellen und ueber einen Zeitraum von 12 Jahren mit einem Mehrkomponentengemisch konzentrierter organischer Verbindungen beaufschlagt worden waren, zerlegt und die Auswirkungen der Schadstoffpermeation auf die Abdichtungsmaterialien untersucht. Schwerpunkte der hier vorgestellten Arbeiten waren Untersuchungen: - zur Auswirkung der Permeation des Gemsiches an organischen Verbindungen auf die Eigenschaften der Kunststoffdichtungsbahn, - zur vertikalen Verteilung der organischen Verbindungen in den mineralischen Dichtungen, - zu Veraenderungen der mineralogischer, mikromorphologischer und bodenmechanischer Eigenschaften der mineralischen Dichtungsmaterialien, - zu mikrobiellen Aktivitaeten in den mineralischen Dichtungen. Daneben wurden Stofftransportparameter bestimmt und eine Modellierung des Stofftransportes durchgefuehrt. Die verschiedenen untersuchten Materialien der Kombinationsdichtungen erwiesen sich unter den extremen Bedingungen als ein stabiles und effizientes Abdichtungssystem. (orig.)

  4. 浅谈土质心墙坝的水力劈裂有限元数值模拟%discussion on finite elment numericl simulation of hydraulic fracturing in the dam with caly cut-off wall

    Institute of Scientific and Technical Information of China (English)

    谢江红

    2010-01-01

    随着我国水电建设飞跃发展,土石坝作为世界坝工建设中应用最为广泛和发展的一种坝型.土质心墙坝作为土石坝中最为典型一种,是很多高坝的首选.从世界上土石坝的破坏的角度看,土质心墙坝的水力劈裂问题是坝工界最为关注.本文主要分析土质心墙坝的水力劈裂的发生原理,并以工程实例作为分析对象进行详细阐述.

  5. Research and Analysis of Pull-out the Joint Pipes of the Cut-off Wall%地下防渗墙接头管起拔研究探讨

    Institute of Scientific and Technical Information of China (English)

    阎逢君; 方红

    2003-01-01

    结合工程实践,对地下防渗墙(连续墙)的接头管起拔进行分析探讨;对起拔阻力中砼与接头管表面接触而产生的摩擦力进行了重点分析;进而提出在地下防渗墙(连续墙)施工中应注意的几个问题.

  6. Pressurized liquid extraction for the determination of cannabinoids and metabolites in hair: Detection of cut-off values by high performance liquid chromatography-high resolution tandem mass spectrometry.

    Science.gov (United States)

    Montesano, Camilla; Simeoni, Maria Chiara; Vannutelli, Gabriele; Gregori, Adolfo; Ripani, Luigi; Sergi, Manuel; Compagnone, Dario; Curini, Roberta

    2015-08-01

    Hair analysis has become a routine procedure in most forensic laboratories since this alternative matrix presents clear advantages over classical matrices; particularly wider time window, non-invasive sampling and good stability of the analytes over time. There are, however, some major challenges for the analysis of cannabinoids in hair, mainly related to the low concentrations of 11-nor-9-carboxy-Δ(9)-tetrahydrocannabinol (THC-COOH), that is the major metabolite. In this study a fast, accurate and sensitive method for the determination of cannabinol, cannabidiol, THC and THC-COOH in hair has been developed. The extraction of analytes from hair (50mg) is based on an automated pressurized liquid extraction (PLE) using water modified with the surfactant sodium dodecyl sulphate as eluent phase. PLE extract is then cleaned up by SPE using polymeric reversed phase cartridges Strata XL before the injection in the HPLC-HRMS/MS system. Chromatographic conditions obtained with a fused-core column allowed a good separation of the analytes in less than 4min. The whole procedure has been validated according to SWGTOX guidelines. The LLOQs obtained for THC-COOH and the other analytes were respectively 0.1 and 2pg/mg. To the best of our knowledge, this is the first LC-MS/MS based method that allows the detection of THC-COOH in hair at values lower than the cut-off. PMID:26118805

  7. The Inhabited Wall olive oil factory in Palestine

    OpenAIRE

    Saunders, Rosie

    2009-01-01

    Olive Oil and Bottle Wash Factory; Market and Base for International Volunteers in Qalqilia, The Palestinian Territories The construction of the separation wall in the Palestinian territories has impacted enormously on the day-to-day lives of Palestinians in Qalqilia. Once described as ‘The West Bank’s Fruit Basket,’ serving Israel and the West Bank as an affluent market town, the people of Qulqilia are now cut off from their land, schools, universities, places of work, medical care, frie...

  8. Cutting off Mediation. Agamben as Master Thinker

    Directory of Open Access Journals (Sweden)

    Astrid Deuber-Mankowsky

    2015-02-01

    Full Text Available Agamben’s Homo Sacer turns centrally upon “bare life”. However, the following subjects are not thematized: natality, gender, sexuality, the relation of the sexes, the heterosexual character of the symbolic order and political culture, the interest of women in the reproduction of life. The entire question of sexual difference —like that of the difference between victim and perpetrator, between witnesses and those born afterwards— is banned from Agamben’s horizon. Thus a deep unease remains, which this paper is intended to explore. It will first present the methodological and theoretical inspirations, which Homo Sacer owes to the thought of Carl Schmitt. Secondly it will show that Schmitt’s concepts of nomos and the state of exception cannot provide a suitable basis for rewriting Foucault’s concept of biopolitics.

  9. Comparison of VerifyNow-P2Y12 test and Flow Cytometry for monitoring individual platelet response to clopidogrel. What is the cut-off value for identifying patients who are low responders to clopidogrel therapy?

    Directory of Open Access Journals (Sweden)

    Castelli Alfredo

    2009-05-01

    Full Text Available Abstract Background Dual anti-platelet therapy with aspirin and a thienopyridine (DAT is used to prevent stent thrombosis after percutaneous coronary intervention (PCI. Low response to clopidogrel therapy (LR occurs, but laboratory tests have a controversial role in the identification of this condition. Methods We studied LR in patients with stable angina undergoing elective PCI, all on DAT for at least 7 days, by comparing: 1 Flow cytometry (FC to measure platelet membrane expression of P-selectin (CD62P and PAC-1 binding following double stimulation with ADP and collagen type I either in the presence of prostaglandin (PG E1; 2 VerifyNow-P2Y12 test, in which results are reported as absolute P2Y12-Reaction-Units (PRU or % of inhibition (% inhibition. Results Thirty controls and 52 patients were analyzed. The median percentage of platelets exhibiting CD62P expression and PAC-1 binding by FC evaluation after stimulation in the presence of PG E1 was 25.4% (IQR: 21.4–33.1% and 3.5% (1.7–9.4%, respectively. Only 6 patients receiving DAT (11.5% had both values above the 1st quartile of controls, and were defined as LR. Evaluation of the same patients with the VerifyNow-P2Y12 test revealed that the area under the receiver-operating-characteristic (ROC curve was 0.94 (95% CI: 0.84–0.98, p 213 PRU gave the maximum accuracy for the detection of patients defined as having LR by FC. Conclusion In conclusion our findings show that a cut-off value of ≤ 15% inhibition or > 213 PRU in the VerifyNow-P2Y12 test may provide the best accuracy for the identification of patients with LR.

  10. Feed Cam Mechanism Design of Cut-off Saws Based on ANSYS%基于ANSYS的林间锯段机进料凸轮机构设计

    Institute of Scientific and Technical Information of China (English)

    战丽; 宫乙帅; 王毅亮

    2012-01-01

    A feeding mechanism is one of the main components of forest self-propelled small-scale cut-off saws, and its rational design determines the efficiency of the entire cutting process. The exact cutting speed is determined through the comparative analysis of theoretical calculation and actual processing empirical value, based on which feed speed is calculated. In order to ensure steady processing, a feed cam is designed and finite element analysis of it is made using ANSYS software to verify the stiffness and strength of the feed mechanism. The mechanism is rationally optimized in order to provide a theoretical basis for the design of the feed mechanism of sawing operation.%进料机构是林间自走式小型锯段机的主要部件之一,其设计的合理与否影响整个锯切加工过程。通过理论计算值与实际加工经验值的对比分析确定切削速度,进而计算出进料速度。为保证加工平稳设计了进料凸轮机构,并利用ANSYS软件对其进行有限元分析,验证凸轮机构的刚度与强度。对该结构进行合理优化,为锯切进料机构的设计提供理论依据。

  11. Body mass index cut-offs for overweight and obesity in Chinese children and adolescents aged 2-18 years%中国2~18岁儿童青少年超重和肥胖筛查体重指数界值点的研究

    Institute of Scientific and Technical Information of China (English)

    李辉; 宗心南; 季成叶; 米杰

    2010-01-01

    Objective To study the body cut-offs of mass index (BMI) for the purpose of screening overweight and obesity for Chinese children and adolescents aged 2-18 years. Methods Based on the BMI growth reference values for Chinese children aged 0-18, using the common methods to establish the BMI cut-offs for screening overweight and obesity. These methods were having the same empirical percentile or Z scores and the BMI value at 18 years consistent with adults.Three sets of BMI cut-offs, including (BMI24, BMI28) , (P85, P95) and (Z1, Z2) , were initially identified. Differences were compared on different cut-off points and prevalence rates of overweight and obesity with different BMI reference, different values and "prevalence" of overweight and obesity based on "2004 Beijing Child and Adolescent Metabolic Syndrome Study ". Cut-offs standards which recommended by the Chinese Working Group on Obesity for Children (WGOC) and by the International Obesity Task Force (IOTF) were also used. Finally the appropriate cut-offs were defined. Results Three sets of BMI cut-offs for screening overweight and obesity for Chinese children and adolescents aged 2-18 years were obtained according to the above mentioned methods for selection. The prevalence rates of overweight and obesity defined by those cut-offs appeared not to be significantly different. Compared with the WGOC, the BMI cut-off points for screening overweight and obesity for both boys and girls from our study were very close to the WGOC', but cut-off points for screening overweight for girls aged 8.5-15.5 y was 0.3-1.0 kg/m2 lower than the WGOC'. Going through the database on screening of "2004 Beijing Children's Metabolic Syndrome Survey ", the prevalence of overweight for girls was about 3.4% higher than using the cut-offs of WGOC. Conclusion Results from this study suggested that the BMI cut-offs passed through the cut-off point of BMI24 and BMI28 at 18 years was appropriate for screening overweight and obesity in

  12. 吉林省新生儿先天性甲状腺功能减低症筛查切值研究%A research on cut off value of thyroid stimulating hormone for newborn congenital hypothyroidism screening in Jilin province

    Institute of Scientific and Technical Information of China (English)

    万立新; 张雯艳; 刘颖; 郝鹏楷; 赵迅; 张桂荣

    2013-01-01

    目的 建立吉林省新生儿先天性甲状腺功能减低症(CH)筛查TSH实验切值.方法 新生儿出生72 h后,并充分哺乳,采集足跟血滴于专用滤纸上,采用时间分辨荧光免疫分析方法,检测滤纸干血片TSH浓度.结果 测定新生儿足跟血TSH共计30 000例,确定本实验室新生儿TSH切值为9.0 mIU/L.结论 TSH切值为9.0 mIU/L是适合吉林省实际情况的.TSH切值的确定为吉林省今后开展大规模的新生儿CH筛查提供了依据.%Objective To determine cut off value of thyroid stimulating hormone (TSH) for screening of congenital hypothyroidism (CH) of newborn in Jilin province.Methods The foot blood samples were obtained at 72 hours after birth and sufficient breast feeding to detect the content of TSH.Results 30 000 neonates were screened,the cut off value of TSH for screening of congenital hypothyroidism of newborn in Jilin was 9.0 mIU/L.Conclusion The TSH cut off value was adjusted to 9.0 mIU/L.The determination of TSH cut off value provided a basis for screening of congenital hypothyroidism among the newborns in Jilin.

  13. Pontos de corte para a aptidão cardiorrespiratória e a triagem de fatores de risco para doenças cardiovasculares na infância Cardiorespiratory fitness cut offs points and cardiovascular risk factors screening at infancy

    Directory of Open Access Journals (Sweden)

    Gabriel Gustavo Bergmann

    2010-10-01

    Full Text Available O principal objetivo deste estudo foi analisar a validade e propor novos pontos de corte para aptidão cardiorrespiratória de escolares de sete a 12 anos de idade. A amostra foi constituída por 1.413 escolares. A aptidão cardiorrespiratória foi medida através do teste de corrida/caminhada de nove minutos. O colesterol total e as pressões arterial sistólica e diastólica foram medidas e através delas foram criadas referências de fatores de risco para doenças cardiovasculares. Através da curva receiver operating characteristic entre a aptidão cardiorrespiratória e as referências de fatores de risco para doenças cardiovasculares foram identificados os valores dos pontos de corte. Adicionalmente foi utilizada a análise bivariada seguida do cálculo de razão de chances (odds ratio-OR para identificar quanto os indivíduos que não atenderam os pontos de corte propostos tinham a mais de chance de apresentar fatores de risco para doenças cardiovasculares. Os resultados indicaram que, dentre as propostas analisadas, a que foi sugerida neste estudo apresentou melhores ajustamentos entre sensibilidade e especificidade. Os resultados da análise bivariada mostraram que indivíduos que não atenderam os pontos de corte propostos têm maiores chances de apresentarem fatores de risco para doenças cardiovasculares.The main objective of the study was to analyze and propose news cardiorespiratory fitness cut offs points for 7 to 12-year old school students. The sample was composed of 1,413 students. Cardiorespiratory fitness was measured by the 9-minutes walking/running test. Total cholesterol and systolic and diastolic blood pressure were measured and with their results cardiovascular risk factors reference were designed. The Receiver Operating Characteristic curve between cardiorespiratory fitness and cardiovascular risk factors reference identified the cut offs point values. The bivariate analysis and odds ratio (OR calculation was used to

  14. The Brazilian hazard-based cut-off criteria for pesticide registration: a critical appraisal / Critérios de exclusão baseados em perigo adotados no Brasil para registro de pesticidas: Uma avalição crítica

    Directory of Open Access Journals (Sweden)

    Francisco José Roma Paumgartten

    2013-02-01

    Full Text Available Brazil, the world’s top consumer of agricultural pesticides, adopts a unique hazard-based cut-off approach to pesticide registration. Cut-off criteria for mutagenicity, carcinogenicity, teratogenicity, hormonal disturbances and damage to reproductive organs were introduced by the Pesticide Law enacted in 1989. As far as health is concerned, law enforcement is additionally regulated by rules issued by the federal health authority (National Agency for Health Surveillance – ANVISA. Contrasting to the European Union’s hazard-based cut-off criteria for pesticides, Brazilian rules do not make an exception for “negligible” exposures. Moreover, Brazilian regulations have shortcomings (e.g. no reference to relevance of Mode of Action to humans that make cut-off criteria difficult to be put into effect. The deficiencies of regulations and difficulties to consistently apply the hazard-based cut-off criteria are appraised in this article. Adoption of a risk assessment approach or cut-off criteria based on classification into the Globally Harmonized System’s hazard categories 1A and 1B is suggested. Resumo O Brasil, líder mundial do consumo de agro-químicos, adota uma singular abordagem para registro de agrotóxicos que é baseada em critérios de exclusão quanto à periculosidade. Critérios de exclusão para mutagenicidade, carcinogenicidade, teratogenicidade, distúrbios hormonais e dano a órgãos reprodutivos foram introduzidos pela Lei de Agrotóxicos promulgada em 1989. Em relação à saúde, a aplicação da lei é também regulada por portarias publicadas pela autoridade sanitária federal (Agência Nacional de Vigilância Sanitária – ANVISA. Em contraste com os critérios de exclusão baseados na periculosidade que a União Européia usa para agrotóxicos, a regulamentação brasileira não faz exceção para exposições insignificantes. Além disso, a regulamentação brasileira apresenta deficiências (e.g., não faz men

  15. Reactivity of the cement-bentonite interface with alkaline solutions using transport cells

    Energy Technology Data Exchange (ETDEWEB)

    Fernandez, Raul [Dpto. Quimica Agricola, Geologia y Geoquimica, Facultad de Ciencias, Universidad Autonoma de Madrid, Campus Cantoblanco, 28049 Madrid (Spain); Cuevas, Jaime [Dpto. Quimica Agricola, Geologia y Geoquimica, Facultad de Ciencias, Universidad Autonoma de Madrid, Campus Cantoblanco, 28049 Madrid (Spain)]. E-mail: jaime.cuevas@uam.es; Sanchez, Laura [Dpto. Quimica Agricola, Geologia y Geoquimica, Facultad de Ciencias, Universidad Autonoma de Madrid, Campus Cantoblanco, 28049 Madrid (Spain); Villa, Raquel Vigil de la [Dpto. Quimica Agricola, Geologia y Geoquimica, Facultad de Ciencias, Universidad Autonoma de Madrid, Campus Cantoblanco, 28049 Madrid (Spain); Leguey, Santiago [Dpto. Quimica Agricola, Geologia y Geoquimica, Facultad de Ciencias, Universidad Autonoma de Madrid, Campus Cantoblanco, 28049 Madrid (Spain)

    2006-06-15

    Clayey formations are considered as suitable host rocks to develop a Deep Geological Repository (DGR) for nuclear wastes. A concrete ring, located between the clayey formation and the bentonite barrier, is needed as structural support for the galleries. This material will act as a source of alkaline fluids when the formation's pore water saturates the system. This investigation evaluates the performance of the concrete-bentonite system by means of both geochemical codes and experimental results. A column made of compacted bentonite from La Serrata (Almeria, Spain) (1.4 g/cm{sup 3}, dry density) was held in contact with an ordinary Portland cement (OPC) mortar. Two alkaline solutions (Ca(OH){sub 2} saturated and NaOH 0.25 M) were injected from the mortar's side at 25, 60 and 120 deg. C. The permeability of the system and the effluent fluid composition were determined periodically. Finally, the solid phase was sampled and analyzed after 1 year of treatment. Ca(OH){sub 2} saturated fluids does not alter the mineralogy over the experiment time scale. NaOH fluids produced minor changes at 60-25 deg. C but at 120 deg. C a thin tobermorite layer of 1.5 mm precipitates in the clay aggregate surfaces at the interface. After this layer, analcime nucleates in heterogeneous patches affecting the whole compacted bentonite probe (2 cm thickness). The use of the PHREEQC code thermodynamic approach predicts the mineralogical transformations. However, it is necessary to introduce kinetic laws and to consider the existence of stagnant zones in the model in order to simulate the heterogeneous spatial alteration observed.

  16. Analysis of prestressed concrete wall segments

    International Nuclear Information System (INIS)

    An iterative numerical technique for analysing the biaxial response of reinforced and prestressed concrete wall segments subject to combinations of prestressing, creep, temperature and live loads is presented. Two concrete constitutive relations are available for this analysis. The first is a uniaxially bilinear model with a tension cut-off. The second is a nonlinear biaxial relation incorporating equivalent uniaxial strains to remove the Poissons's ratio effect under biaxial loading. Predictions from both the bilinear and nonlinear model are compared with observations from experimental wall segments tested in tension. The nonlinear model results are shown to be close to those of the test segments, while the bilinear results are good up to cracking. Further comparisons are made between the nonlinear analysis using constant membrane force-moment ratios, constant membrane force-curvature ratios, and a nonlinear finite difference analysis of a test containment structure. Neither nonlinear analysis could predict the reponse of every wall segment within the structure, but the constant membrane force-moment analysis provided lower bound results. (author)

  17. Amplitude no fósforo microbiano em um Argissolo em pastagem nativa submetida à roçada e à introdução de espécies forrageiras com fertilização fosfatada em diferentes épocas = Microbial phosphorus fluctuation in a Hapludalf under natural pasture, with cut off and forage species introduction, fertilized in different times

    Directory of Open Access Journals (Sweden)

    Danilo dos Santos Rheinheimer

    2008-10-01

    Full Text Available Em solos com elevado grau de intemperismo, a imobilização temporária de fósforo pela biomassa microbiana do solo (BMS pode ser um mecanismo de retardamento das reações de adsorção. O objetivo do presente trabalho foi avaliar a amplitude no fósforo microbiano (Pmem um Argissolo em pastagem nativa submetida à roçada, introdução de forrageiras exóticas e adubadas com fertilizantes fosfatados. O estudo foi desenvolvido a partir de um experimento instalado em 1997 que constava de cinco tratamentos de fosfato e calagem (testemunha semfósforo; hiperfosfato de gafsa; superfosfato triplo; superfosfato triplo + calcário e superfosfato simples + calcário, distribuídos em quatro blocos ao acaso. Em junho de 2002, a pastagem nativaremanescente foi roçada, semeada a pastagem de inverno e as parcelas originais foram divididas em três subparcelas. A reposição dos fertilizantes fosfatados foi feita em três épocas, uma em cadasubparcela: sem reaplicação; reaplicação após a roçada da pastagem nativa remanescente (outonojunho; e reaplicação após a roçada da forrageira hibernal (primavera-novembro. A primeira avaliação do Pm foi feita 16 dias antes da primeira roçada, considerando o reinício doexperimento (0 dia. A partir daí, coletaram-se amostras de solo aos 25, 36, 55, 82, 111, 139, 163, 171, 181, 197, 219, 229, 248, 274 e 316 dias após o reinício do experimento. O corte das forrageiras induziu à imobilização de fósforo pela biomassa microbiana do solo. Parte do fósforo adicionado, via fertilizantes, foi imobilizado temporariamente pela biomassa microbiana do solo.In very weathered soils, the temporary phosphorus immobilization by soil microbial biomass (SMB could be a mechanism to reduce P adsorption. This study was carried out to evaluate the microbial phosphorus (Pm content fluctuation in a Hapludalf under natural pasture with cut off and exotic forage species introduction and fertilized with phosphorus fertilizers

  18. Influence of different body mass index cut-off values in assessing the nutritional status of adolescents in a household survey Influência de distintos valores críticos do índice de massa corporal na avaliação do estado nutricional de adolescentes em inquérito domiciliar

    Directory of Open Access Journals (Sweden)

    Fabio da Silva Gomes

    2009-08-01

    Full Text Available The purpose of this study was to evaluate the anthropometric nutritional status of the adolescent population of Niterói, Rio de Janeiro State, Brazil, and the influence of changes in the adopted body mass index (BMI cut-offs in the nutritional status assessment of the adolescent population. A population-based survey conducted in 2003 obtained data from a probabilistic sample of 1,734 households and 523 adolescents. The multiple proportions test and prevalence ratios were used to analyze differences between estimates obtained from different BMI cut-offs. Changes in cut-off values from the old to the new recommendation of the World Health Organization (WHO resulted in a significant increase in overweight prevalence among total, male and female adolescent population (25%, 27% and 23%, respectively (p Este artigo tem por objetivo avaliar o estado nutricional antropométrico da população adolescente residente em Niterói, Rio de Janeiro, Brasil, bem como a influência das mudanças nos valores críticos de índice de massa corporal (IMC na avaliação do estado nutricional dessa população. Uma pesquisa amostral probabilística de base populacional conduzida em 2003 obteve dados de 1.734 domicílios e 523 adolescentes. Testes para múltiplas proporções e razões de prevalência foram utilizados para analisar as diferenças entre estimativas obtidas segundo distintos valores críticos de IMC. Mudanças nos pontos de corte da antiga para a atual recomendação da Organização Mundial da Saúde (OMS resultaram em aumentos significativos nas prevalências de sobrepeso entre o total de adolescentes, meninos e meninas (25%, 27% e 23%, respectivamente (p < 0,05. A proposta da International Obesity Task Force resultou em uma redução significativa de 29% e 39% na prevalência de baixo-IMC-para-idade entre o total de adolescentes e meninos, respectivamente, quando comparada à recomendação atual da OMS (p < 0,05. Foi evidenciado que uma simples

  19. A new alternative in vertical barrier wall construction

    Energy Technology Data Exchange (ETDEWEB)

    Rawl, G.F. [Horizontal Technologies Inc., Matlacha, FL (United States)

    1997-12-31

    A new proprietary vertical barrier wall system has been developed to revolutionize the construction process by eliminating many of the concerns of conventional installation method`s with respect to performance, installation constraints and costs. Vertical barrier walls have been used in the environmental and construction industries for a variety of purposes, usually for cut-off or containment. The typical scenario involves a groundwater contamination problem, in which a vertical barrier wall is utilized to contain or confine the spread of contaminants below the ground surface. Conventional construction techniques have been adequate in many applications, but often fall short of their intended purposes due to physical constraints. In many instances, the economics of these conventional methods have limited the utilization of physical barrier walls. Polywall, the trade name for this new barrier wall technology, was subsequently developed to meet these needs and offer a number of distinct advantages in a variety of scenarios by maximizing confinement and minimizing installation costs. Polywall is constructed from chemically resistant high density polyethylene (HDPE) plastic. It has proven in a half-dozen projects to date to be the most cost-effective and technically sound approach to many containment situations. This paper will cover the development of the technology and will provide a brief synopsis of several installations.

  20. Determination and Application of the cut-off values of RBC Indexes in Screening for Silent α-Thalassemias Carriers%静止型α-地中海贫血红细胞指标临界值的确定及其应用

    Institute of Scientific and Technical Information of China (English)

    汪伟山; 周玉球; 张永良; 肖奇志

    2011-01-01

    Objective To investigate the cut-off values of RBC indexes in screening silent alpha-thalassemias carriers and to evaluate clinical application of the cut-off values. Methods RBC indexes of 77 cases with silent α-thalassaemia and 151 healthy adults (as normal control group)were retrospected,β-thalassaemias and iron deficiency were excluded in the above mentioned individuals.The receiver operating characteristic(ROC)curve was used for identifying the useful RBC index and determining the cut-off values in the screening for silent α-thalassaemias. Results (1)The area under ROC curve of MCV、MCH、MCHC were 0. 857、0. 858 and 0. 740, respectively. Those indexes were of value to screen for silent α-thalassaemias carriers; (2)The cut-off values of MCV、 MC H、MCHC were 82.0 fl and 28.0pg as well as 341.5 g/L; (3)The sensitivity and specificity of the parallel test of either MCV or MCH were 93. 5 % and 72.8 %, respectively. Five silent α-thalassemia carriers failed to detect by the parallel test, resulting in a rate of 6.49%(5/77) for failure of detection, the risk of failure of detection was decreased 12 times when compared with recommended standard by TIF. They were much better than other tests. Conclusion The parallel test of either MCV≤82.0 fl or MCH≤28.0 pg can screen silent α-thalassaemia carriers effectively. The results provide the scientific basis of clinical value for clinics performing genetic counseling in the high prevalent area of thalassaemia,especially in the areas where thalassaemias can not be genotyped.%目的 探讨并评估红细胞相关指标及其临界值用于筛查静止型α-地中海贫血(α-地贫)的临床价值.方法 以77例单纯性静止型α-地贫患者和151例健康成人为研究对象,采用受试者工作特征曲线(ROC曲线)确定静止型α-地贫筛查指标及其临界值.结果 MCV、MCH、MCHC的 ROC曲线下面积分别为0.857,0.858,0.740,均有筛查价值,其最佳临界值分别为82.0 fl、28

  1. Rendimento da pupunheira em função da densidade de plantio, diâmetro de corte e manejo dos perfilhos no Vale do São Francisco Effect of density, cut-off diameter classes and shoot number on production and yield of irrigated plant peach palm at San Francisco River Valley

    Directory of Open Access Journals (Sweden)

    José Egidio Flori

    2004-02-01

    Full Text Available Com o objetivo de avaliar o rendimento de palmito de pupunheira irrigada em função da densidade de plantio, diâmetro de corte do estipe e o manejo dos perfilhos, instalou-se um experimento na Estação Experimental de Bebedouro da Embrapa Semi-Árido, Petrolina, PE. O delineamento utilizado foi de blocos ao acaso em parcelas subdivididas, sendo as parcelas constituídas por dois espaçamentos (2,0 x 1,0 m - E1 e 2,0 x 2,0 m - E2 e as subparcelas em arranjo fatorial 2 x 2, compreendendo dois manejos de perfilhos e duas classes de diâmetros de corte. As colheitas foram feitas a partir de 16 meses até os 69 meses após o plantio e realizadas com intervalos consecutivos de mais ou menos três meses. Pelos resultados, evidenciaram-se efeitos significativos para espaçamento, manejo de perfilhos e classe de diâmetro de corte. Não foram constatadas interações entre os tratamentos. Houve efeito significativo de espaçamento sobre o rendimento, diâmetro de corte, comprimento e peso médio do palmito. O rendimento e o peso do palmito da pupunheira foram de 545 e 434 kg ha-1 ano-1 e 147 g e 180 g nos espaçamentos E1 e E2, respectivamente. O diâmetro de corte afetou a altura da planta e peso médio do palmito. O manejo de perfilho afetou o rendimento e o peso médio do palmito, com 532 e 446 kg ha-1 e 177 e 149 g de palmito, respectivamente, no manejo de quatro e todos os perfilhos por planta. Pelos resultados, infere-se, como orientação técnica para os produtores de áreas irrigadas do Submédio São Francisco, o cultivo da pupunha no espaçamento de 2 m x 1 m, o manejo de quatro perfilhos por planta e o corte da planta com diâmetro variando de 10 a 12 cm, a 30 cm do nível do solo.The objective of this experiment was to evaluate the effect of planting density, cut-off diameter classes and shoot number on heart of palm production on irrigated peach palm. The experimental layout was a randomized split-plot design with a factorial arrangement

  2. The cut-off value of waist-to-height ratio in detecting central obesity in Chinese adult population%中国成人中心性肥胖腰围身高比值的适宜切点的研究

    Institute of Scientific and Technical Information of China (English)

    赵连成; 李莹; 彭亚光; 张林峰; 郭敏; 武阳丰

    2012-01-01

    目的 探讨我国中年人群腰围身高比值(WHtR)诊断中心性肥胖的适宜切点.方法 选用国家“八五”和“九五”攻关课题的两次横断面调查,共30 630名35~59岁人群资料,比较不同WHtR切点对高血压、空腹血糖异常、血清总胆固醇升高(高TC)、血清高密度脂蛋白胆固醇降低(低HDL-C)以及危险因素聚集(危险因素个数≥2)的检出效果,并分析各危险因素及其聚集的人群归因危险度.结果 预测4种危险因素的WHtR最佳切点范围在0.48~0.52,预测危险因素聚集的WHtR最佳切点在男性、女性及男女合并人群中分别为0.49、0.50及0.49.人群WHtR控制在0.50以下,叮防止人群中约2/5的高血压,1/5空腹血糖异常和高TC,1/3的低HDL-C,以及约一半的危险因素聚集.结论 WHtR为0.50可作为我国中年人群中心性肥胖评价的适宜切点.以“腰围不超过身高一半”作为体重控制理念,促进心血管病的预防.%Objective To explore the optimal cut-off value of waist-to-height ratio (WHtR) in detecting the central obesity in Chinese adult population. Methods A total of 30630 participants aged 35-59 from different areas in mainland China were surveyed for cardiovascular diseases risk factors in two independent cross-sectional studies that carried out in 1992-1994 and 1998, respectively. The sensitivity, specificity, positive and negative predictive value and Youden's index for hypertension, abnormal glucose, high serum total cholesterol (high TO, low serum high density lipoprotein cholesterol (low HDL-C) and clustering of risk factors ( number≥ 2 ) were calculated to evaluate the efficacy of detecting central obesity. The population attributable risk proportion was also used to analyze the public health signification of the optimal cut-off value. Results The optimal cut-off values of WHtR for 4 risk factors (hypertension, abnormal glucose, high TC, low HDL-C) ranged from 0.48 - 0.52. Moreover, the optimal values

  3. Cell Wall

    OpenAIRE

    Jamet, Elisabeth; Canut, Hervé; Boudart, Georges; Albenne, Cécile; Pont-Lezica, Rafael F

    2008-01-01

    This chapter covers our present knowledge of cell wall proteomics highlighting the distinctive features of cell walls and cell wall proteins in relation to problems encountered for protein extraction, separation and identification. It provides clues to design strategies for efficient cell wall proteomic studies. It gives an overview of the kinds of proteins that have yet been identified: the expected proteins vs the identified proteins. Finally, the new vision of the cell wall proteome, and t...

  4. Plasma-filled rippled wall rectangular backward wave oscillator driven by sheet electron beam

    Indian Academy of Sciences (India)

    A Hadap; J Mondal; K C Mittal; K P Maheshwari

    2011-03-01

    Performance of the backward wave oscillator (BWO) is greatly enhanced with the introduction of plasma. Linear theory of the dispersion relation and the growth rate have been derived and analysed numerically for plasma-filled rippled wall rectangular waveguide driven by sheet electron beam. To see the effect of plasma on the TM01 cold wave structure mode and on the generated frequency, the parameters used are: relativistic factor = 1.5 (i.e. / = 0.741), average waveguide height 0 = 1.445 cm, axial corrugation period 0 = 1.67 cm, and corrugation amplitude = 0.225 cm. The plasma density is varied from zero to 2 × 1012 cm-3. The presence of plasma tends to raise the TM01 mode cut-off frequency (14 GH at 2 × 1012 cm-3 plasma density) relative to the vacuum cut-off frequency (5 GH) which also causes a decrease in the group velocity everywhere, resulting in a flattening of the dispersion relation. With the introduction of plasma, an enhancement in absolute instability was observed.

  5. Ambiguous walls

    DEFF Research Database (Denmark)

    Mody, Astrid

    2012-01-01

    The introduction of Light Emitting Diodes (LEDs) in the built environment has encouraged myriad applications, often embedded in surfaces as an integrated part of the architecture. Thus the wall as responsive luminous skin is becoming, if not common, at least familiar. Taking into account how wall...

  6. Man Cuts Off Penis in Fit of Religious Fervor

    Institute of Scientific and Technical Information of China (English)

    朱土英

    2002-01-01

    一位菲律宾的男子自残,用利刃割下了自己的阳物。主要原因是其妻离他而去。到首都马尼拉去做保姆(housemaid)了。他想象自己的阳物正像眼镜蛇一样逼近其他女性(his penis as a"cobra"(眼镜蛇)drawing him towardwomen),而《马太福音》曾云:If your hand or your foot causes you to sin,cut it offand throw it away.于是,此君对自己下了“毒手”。可幸的是,手术成功,割下的阳物又被接上。只是短了20%……

  7. The UV cut-off and trans-Planckian physics

    International Nuclear Information System (INIS)

    Full text: Physics at ultra high energies, far above those presently probed, is unknown. It is expected that modifications of the field equations become relevant at some point. Besides, it would be positive if field modes could get less relevant as bigger energies are at play. Many possible approaches to this subject, based either on some kind of refashioning of the laws of Physics, like String Theory and remaking of gravity, or on pure phenomenological grounds, are being now discussed. There does not seem to be a consensus in the literature concerning the possible outcome of these changes, nor in the near future. Moreover, one must find some observable effect of this new Physics. As such energies are not reached by experiments at hand, one needs to seek for results relevant at low energies. We address the possibility of introducing an Ultraviolet attenuation of the occupation of high modes by verifying its effects on inflationary perturbations and Hawking radiation. We consider the changes to be the outcome of an unknown modification of the physics at very high energies (Trans-Planckian Physics). The spectrum of inflationary perturbations is shown to be in agreement with observations, and the consequences for the Hawking radiation are being analyzed. (author)

  8. Tentative Colistin Epidemiological Cut-Off Value for Salmonella spp.

    OpenAIRE

    Agersø, Yvonne; Torpdahl, Mia; Zachariasen, Camilla; Seyfarth, Anne Mette; Hammerum, Anette M.; Nielsen, Eva Møller

    2012-01-01

    The objective of this research was to determine minimal inhibitory concentration (MIC) population distributions for colistin for Salmonella on subtype level. Furthermore, we wanted to determine if differences in MIC for colistin could be explained by mutations in pmrA or pmrB encoding proteins involved in processes that influence the binding of colistin to the cell membrane. During 2008–2011, 6,583 Salmonella enterica subsp. enterica isolates of human origin and 1931 isolates of animal/meat o...

  9. Tentative Colistin Epidemiological Cut-Off Value for Salmonella spp

    DEFF Research Database (Denmark)

    Agersø, Yvonne; Torpdahl, Mia; Zachariasen, Camilla;

    2012-01-01

    The objective of this research was to determine minimal inhibitory concentration (MIC) population distributions for colistin for Salmonella on subtype level. Furthermore, we wanted to determine if differences in MIC for colistin could be explained by mutations in pmrA or pmrB encoding proteins...... involved in processes that influence the binding of colistin to the cell membrane. During 2008–2011, 6,583 Salmonella enterica subsp. enterica isolates of human origin and 1931 isolates of animal/meat origin were collected. The isolates were serotyped, and susceptibility was tested towards colistin (range...... 1–16 mg/L). Moreover, 37 isolates were tested for mutations in pmrA and pmrB by polymerase chain reaction (PCR) and DNA sequencing. MIC distribution for colistin at serotype level showed that Salmonella Dublin (n=198) followed by Salmonella Enteritidis (n=1247) were less susceptible than “other...

  10. A cut-off tubular geometry of loop space

    CERN Document Server

    Mukhopadhyay, Partha

    2014-01-01

    Motivated by the computation of loop space quantum mechanics as indicated in [7], here we seek a better understanding of the tubular geometry of loop space ${\\cal L}{\\cal M}$ corresponding to a Riemannian manifold ${\\cal M}$ around the submanifold of vanishing loops. Our approach is to first compute the tubular metric of $({\\cal M}^{2N+1})_{C}$ around the diagonal submanifold, where $({\\cal M}^N)_{C}$ is the Cartesian product of $N$ copies of ${\\cal M}$ with a cyclic ordering. This gives an infinite sequence of tubular metrics such that the one relevant to ${\\cal L}{\\cal M}$ can be obtained by taking the limit $N\\to \\infty$. Such metrics are computed by adopting an indirect method where the general tubular expansion theorem of [12] is crucially used. We discuss how the complete reparametrization isometry of loop space arises in the large-$N$ limit and verify that the corresponding Killing equation is satisfied to all orders in tubular expansion. These tubular metrics can alternatively be interpreted as some n...

  11. Brick Walls for Black Holes in AdS/CFT

    CERN Document Server

    Iizuka, Norihiro

    2013-01-01

    We study the 't Hooft's brick wall model for black holes in a holographic context. The brick wall model suggests that without an appropriate near horizon IR cut-off, the free energy of the probe fields show the divergence due to the large degenerate states near the horizons. After studying the universal nature of the divergence in various holographic setting in various dimensions, we interpret the nature of the divergence in a holographic context. The free energy divergence is due to the large degeneracy and continuity of the low energy spectrum in the boundary theory at the deconfinement phase. These divergence and continuity should be removed by finite N effects, which make the spectrum discrete even at the deconfinement phase. On the other hand, in the bulk, these degenerate states are localized near the horizon, and the universal divergence of these degenerate states implies that the naive counting of the degrees of freedom in bulk should be modified once we take into account the non-perturbative quantum ...

  12. Brick walls for black holes in AdS/CFT

    Directory of Open Access Journals (Sweden)

    Norihiro Iizuka

    2015-06-01

    Full Text Available We study the 't Hooft's brick wall model for black holes in a holographic context. The brick wall model suggests that without an appropriate near horizon IR cut-off, the free energy of the probe fields shows the divergence due to the large degenerate states near the horizons. After studying the universal nature of the divergence in various holographic settings in various dimensions, we interpret the nature of the divergence in a holographic context. The free energy divergence is due to the large degeneracy and continuity of the low energy spectrum in the boundary theory at the deconfinement phase. These divergence and continuity should be removed by finite N effects, which make the spectrum discrete even at the deconfinement phase. On the other hand, in the bulk, these degenerate states are localized near the horizon, and the universal divergence of these degenerate states implies that the naive counting of the degrees of freedom in bulk should be modified once we take into account the non-perturbative quantum gravity effects near the horizon. Depending on the microscopic degrees of freedom, the position, where the effective field theory description to count the states breaks down, has different Planck scale dependence. It also implies the difficulty to have an electron like gauge-singlet elementary field in the boundary theory Lagrangian. These singlet fields are at most composite fields, because they show divergent free energy, suggesting a positive power of N at the deconfinement phase.

  13. Brick walls for black holes in AdS/CFT

    Energy Technology Data Exchange (ETDEWEB)

    Iizuka, Norihiro, E-mail: iizuka@yukawa.kyoto-u.ac.jp; Terashima, Seiji, E-mail: terasima@yukawa.kyoto-u.ac.jp

    2015-06-15

    We study the 't Hooft's brick wall model for black holes in a holographic context. The brick wall model suggests that without an appropriate near horizon IR cut-off, the free energy of the probe fields shows the divergence due to the large degenerate states near the horizons. After studying the universal nature of the divergence in various holographic settings in various dimensions, we interpret the nature of the divergence in a holographic context. The free energy divergence is due to the large degeneracy and continuity of the low energy spectrum in the boundary theory at the deconfinement phase. These divergence and continuity should be removed by finite N effects, which make the spectrum discrete even at the deconfinement phase. On the other hand, in the bulk, these degenerate states are localized near the horizon, and the universal divergence of these degenerate states implies that the naive counting of the degrees of freedom in bulk should be modified once we take into account the non-perturbative quantum gravity effects near the horizon. Depending on the microscopic degrees of freedom, the position, where the effective field theory description to count the states breaks down, has different Planck scale dependence. It also implies the difficulty to have an electron like gauge-singlet elementary field in the boundary theory Lagrangian. These singlet fields are at most composite fields, because they show divergent free energy, suggesting a positive power of N at the deconfinement phase.

  14. Brick walls for black holes in AdS/CFT

    Science.gov (United States)

    Iizuka, Norihiro; Terashima, Seiji

    2015-06-01

    We study the 't Hooft's brick wall model for black holes in a holographic context. The brick wall model suggests that without an appropriate near horizon IR cut-off, the free energy of the probe fields shows the divergence due to the large degenerate states near the horizons. After studying the universal nature of the divergence in various holographic settings in various dimensions, we interpret the nature of the divergence in a holographic context. The free energy divergence is due to the large degeneracy and continuity of the low energy spectrum in the boundary theory at the deconfinement phase. These divergence and continuity should be removed by finite N effects, which make the spectrum discrete even at the deconfinement phase. On the other hand, in the bulk, these degenerate states are localized near the horizon, and the universal divergence of these degenerate states implies that the naive counting of the degrees of freedom in bulk should be modified once we take into account the non-perturbative quantum gravity effects near the horizon. Depending on the microscopic degrees of freedom, the position, where the effective field theory description to count the states breaks down, has different Planck scale dependence. It also implies the difficulty to have an electron like gauge-singlet elementary field in the boundary theory Lagrangian. These singlet fields are at most composite fields, because they show divergent free energy, suggesting a positive power of N at the deconfinement phase.

  15. Brick walls for black holes in AdS/CFT

    International Nuclear Information System (INIS)

    We study the 't Hooft's brick wall model for black holes in a holographic context. The brick wall model suggests that without an appropriate near horizon IR cut-off, the free energy of the probe fields shows the divergence due to the large degenerate states near the horizons. After studying the universal nature of the divergence in various holographic settings in various dimensions, we interpret the nature of the divergence in a holographic context. The free energy divergence is due to the large degeneracy and continuity of the low energy spectrum in the boundary theory at the deconfinement phase. These divergence and continuity should be removed by finite N effects, which make the spectrum discrete even at the deconfinement phase. On the other hand, in the bulk, these degenerate states are localized near the horizon, and the universal divergence of these degenerate states implies that the naive counting of the degrees of freedom in bulk should be modified once we take into account the non-perturbative quantum gravity effects near the horizon. Depending on the microscopic degrees of freedom, the position, where the effective field theory description to count the states breaks down, has different Planck scale dependence. It also implies the difficulty to have an electron like gauge-singlet elementary field in the boundary theory Lagrangian. These singlet fields are at most composite fields, because they show divergent free energy, suggesting a positive power of N at the deconfinement phase

  16. Ultrafast nonlinear photoresponse of single-wall carbon nanotubes: a broadband degenerate investigation

    Science.gov (United States)

    Xu, Shuo; Wang, Fengqiu; Zhu, Chunhui; Meng, Yafei; Liu, Yujie; Liu, Wenqing; Tang, Jingyi; Liu, Kaihui; Hu, Guohua; Howe, Richard C. T.; Hasan, Tawfique; Zhang, Rong; Shi, Yi; Xu, Yongbing

    2016-04-01

    Understanding of the fundamental photoresponse of carbon nanotubes has broad implications for various photonic and optoelectronic devices. Here, Z-scan and pump-probe spectroscopy performed across 600-2400 nm were combined to give a broadband `degenerate' mapping of the nonlinear absorption properties of single-wall carbon nanotubes (SWNTs). In contrast to the views obtained from non-degenerate techniques, sizable saturable absorption is observed from the visible to the near-infrared range, including the spectral regions between semiconducting excitonic peaks and metallic tube transitions. In addition, the broadband mapping unambiguously reveals a photobleaching to photoinduced absorption transition feature within the first semiconducting excitonic band ~2100 nm, quantitatively marking the long-wavelength cut-off for saturable absorption of the SWNTs investigated. Our findings present a much clearer physical picture of SWNTs' nonlinear absorption characteristics, and help provide updated design guidelines for SWNT based nonlinear optical devices.Understanding of the fundamental photoresponse of carbon nanotubes has broad implications for various photonic and optoelectronic devices. Here, Z-scan and pump-probe spectroscopy performed across 600-2400 nm were combined to give a broadband `degenerate' mapping of the nonlinear absorption properties of single-wall carbon nanotubes (SWNTs). In contrast to the views obtained from non-degenerate techniques, sizable saturable absorption is observed from the visible to the near-infrared range, including the spectral regions between semiconducting excitonic peaks and metallic tube transitions. In addition, the broadband mapping unambiguously reveals a photobleaching to photoinduced absorption transition feature within the first semiconducting excitonic band ~2100 nm, quantitatively marking the long-wavelength cut-off for saturable absorption of the SWNTs investigated. Our findings present a much clearer physical picture of

  17. Clinical significance in squamous cell lung cancer patients with serum CYFRA21-1 and SCC by ROC curve and cut-off theory%肺鳞癌患者血清CYFRA21-1和SCC检测及ROC曲线和截断点的理论分析

    Institute of Scientific and Technical Information of China (English)

    刘磊; 刘彬; 朱莉莉; 张薇

    2012-01-01

    目的:探讨血清细胞角蛋白19片段(CYFRA21-1)抗原和鳞癌抗原(SCC)对肺鳞癌的临床意义.方法:将研究对象分组,试验组为102例肺鳞癌患者,对照组为53例良性肺病患者.分别采用电化学发光法和酶联免疫法检测血清CYFRA21-1及SCC,测定值用t检验,率比较用x2检验.接受者工作特征(ROC)曲线及截断点选择理论评估CYFRA21-1及SCC的临床价值.结果:肺鳞癌组与良性肺病组CYFRA21-1和SCC水平差异有统计学意义;CYFRA21-1以3.3 ng/mL、SCC以1.5 ng/mL为诊断临界点,CYFRA21-1诊断肺鳞癌敏感性为57.84%,特异性为92.45%,准确性为69.68%,ROC曲线下面积为0.788;SCC诊断肺鳞癌敏感性为33.33%,特异性为92.45%,准确性为53.55%,ROC曲线下面积为0.691;CYFRA21-1诊断肺鳞癌最佳截断点为2.485或2.365 ng/mL,对应敏感性和特异性分别为65.7%、92.5%和67.6%、90.6%;SCC诊断肺鳞癌最佳截断点为0.55 ng/mL,对应敏感性和特异性分别为72.5%和62.3%.随肺鳞癌分期增高,CYFRA21-1和SCC浓度增高差异有统计学意义,CYFRA21-1敏感性增高差异有统计学意义,SCC敏感性无明显变化.结论:CYFRA21-1对肺鳞癌的诊断具有较高的临床价值,而SCC对肺鳞癌的诊断价值较低.%OBJECTIVE: To make further efforts and investigate the clinical significance of cytokeratin fragment 19 (CYFRA21-l)and squamous cell carcinoma antigen(SCC) of serum tumor markers (TM) in the diagnosis of squamous cell lung cancer patients. METHODS: The subjects were divided into two groups: the squamous cell lung cancer group (102 patients) and the benign lung disease group(53 patients). The electric chemisty irradiance was used to examine blood serum CYFRA21-1 and SCC was examined by ELISA. The results were examined by z-test, and the rate comparison were examined by Chi-square test. Receiver operator characteristic curve and cut-off choice theory were used to value the results. RESULTS: Significant

  18. A novel VLES model accounting for near-wall turbulence: physical rationale and applications

    Science.gov (United States)

    Jakirlic, Suad; Chang, Chi-Yao; Kutej, Lukas; Tropea, Cameron

    2014-11-01

    A novel VLES (Very Large Eddy Simulation) model whose non-resolved residual turbulence is modelled by using an advanced near-wall eddy-viscosity model accounting for the near-wall Reynolds stress anisotropy influence on the turbulence viscosity by modelling appropriately the velocity scale in the relevant formulation (Hanjalic et al., 2004) is proposed. It represents a variable resolution Hybrid LES/RANS (Reynolds-Averaged Navier-Stokes) computational scheme enabling a seamless transition from RANS to LES depending on the ratio of the turbulent viscosities associated with the unresolved scales corresponding to the LES cut-off and the `unsteady' scales pertinent to the turbulent properties of the VLES residual motion, which varies within the flow domain. The VLES method is validated interactively in the process of the model derivation by computing fully-developed flow in a plane channel (important representative of wall-bounded flows, underlying the log-law for the velocity field, for studying near-wall Reynolds stress anisotropy) and a separating flow over a periodic arrangement of smoothly-contoured 2-D hills. The model performances are also assessed in capturing the natural decay of the homogeneous isotropic turbulence. The model is finally applied to swirling flow in a vortex tube, flow in an IC-engine configuration and flow past a realistic car model.

  19. Limit load analysis of thick-walled concrete structures

    International Nuclear Information System (INIS)

    The paper illustrates the interaction of constitutive modeling and finite element solution techniques for limit load prediction of concrete structures. On the constitutive side, an engineering model of concrete fracture is developed in which the Mohr-Coulomb criterion is augmented by tension cut-off to describe incipient failure. Upon intersection with the stress path the failure surface collapses for brittle behaviour according to one of three softening rules, no-tension, no-cohesion, and no-friction. The stress transfer accompanying the energy dissipation during local failure is modelled by several fracture rules which are examined with regard to ultimate load prediction. On the numerical side the effect of finite element idealization is studied first as far as ultimate load convergence is concerned. Subsequently, incremental tangential and initial load techniques are compared together with the effect of step size. Limit load analyses of a thick-walled concrete ring and a lined concrete reactor closure conclude the paper with examples from practical engineering. (orig.)

  20. Determinação de escore e nota de corte do módulo de asma do International Study of Asthma and Allergies in Childhood para discriminação de adultos asmáticos em estudos epidemiológicos Determining the score and cut-off point that would identify asthmatic adults in epidemiological studies using the asthma module of the International Study of Asthma and Allergies in Childhood questionnaire

    Directory of Open Access Journals (Sweden)

    Elayne de Fátima Maçãira

    2005-12-01

    Full Text Available OBJETIVO: Validar o questionário padronizado escrito do International Study of Asthma and Allergies in Childhood, módulo sobre asma, para pesquisa de prevalência de asma, estabelecendo seu escore e a nota de corte para discriminação de adultos asmáticos. MÉTODOS: Entrevistamos pacientes ambulatoriais adultos, 40 asmáticos e 38 controles, pareados por sexo e idade, utilizando o módulo de asma do International Study of Asthma and Allergies in Childhood, composto por oito aspectos dicotômicos de asma. Determinamos o escore e a nota de corte para discriminação de asmáticos, definindo sua sensibilidade, especificidade e índice de Youden. Validamos o método em contraposição ao diagnóstico clínico e funcional. A reprodutibilidade das questões individuais foi testada por meio de reentrevistas de metade dos pacientes após algumas semanas. RESULTADOS: O escore variou de 0 a 14 pontos. Um escore = 5 pontos permitiu discriminar pacientes asmáticos (sensibilidade = 93%, especificidade = 100% e índice de Youden = 0,93. A maioria das questões apresentou boa reprodutibilidade, observada em reentrevista após 48,2 ± 11,1 dias (Kappa e Kappa ponderado variando de 0,43 a 1,00 para as questões individuais. CONCLUSÃO: A validação de uma nota de corte permite uma interpretação alternativa às informações fornecidas pelo módulo de asma do International Study of Asthma and Allergies in Childhood, levando em conta o conjunto das informações e não somente as respostas individuais de cada questão em estudos de prevalência de asma em adultos.OBJECTIVE: To validate, for use in asthma prevalence studies, the asthma module of the standardized written questionnaire developed for use in the International Study of Asthma and Allergies in Childhood, establishing the score and cut-off point that would identify asthmatic adults. METHODS: We interviewed 78 adult outpatients (40 adult asthmatics and 38 age-matched and gender-matched controls

  1. Falling walls

    CERN Multimedia

    It was 20 years ago this week that the Berlin wall was opened for the first time since its construction began in 1961. Although the signs of a thaw had been in the air for some time, few predicted the speed of the change that would ensue. As members of the scientific community, we can take a moment to reflect on the role our field played in bringing East and West together. CERN’s collaboration with the East, primarily through links with the Joint Institute for Nuclear Research, JINR, in Dubna, Russia, is well documented. Less well known, however, is the role CERN played in bringing the scientists of East and West Germany together. As the Iron curtain was going up, particle physicists on both sides were already creating the conditions that would allow it to be torn down. Cold war historian Thomas Stange tells the story in his 2002 CERN Courier article. It was my privilege to be in Berlin on Monday, the anniversary of the wall’s opening, to take part in a conference entitled &lsquo...

  2. 辨认和控制能力精神医学评定量表划界标准与实证效度%Cut-off point and empirical validity of psychiatric assessment scale of cognitive and volition capacity in crime

    Institute of Scientific and Technical Information of China (English)

    李毅; 高北陵; 胡峰; 李学武; 王轶; 吴冬凌

    2014-01-01

    目的 检验辨认和控制能力精神医学评定量表(Psychiatric Assessment Scale of Cognitive and Volition Capacity in crime,PASCVC)的实证效度,并制定全国常模.方法 于2009年8月至2011年12月间在全国七大行政区的十五家司法鉴定机构共收集评定辨认和控制能力的司法精神鉴定案例1 000例,由量表评定者用PASCVC、精神病人限定刑事责任能力评定量表(Diminished Criminal Responsibility Rating Scale,DCRRS)和暴力作案行为人刑事责任能力评定量表(Criminal Responsibility Rating Scale of Violence,CRRSV)进行评分,所有案例均由鉴定人做出辨认和控制能力完全丧失、大部分丧失、部分丧失、小部分丧失、稍有受损和正常的六个等级判断.结果 ①依据频数分布表的结果得出:辨认和控制能力完全丧失的划界分为≤56、大部分丧失为57~ 66、部分丧失为67~76、小部分丧失为77~ 87、稍有受损为88~ 100、正常为≥101.②六级划界分评定的等级划分结果与专家鉴定意见的相关为0.939 (P=0.001).③PASCVC与DCRRS和CRRSV的一致性Kappa值分别为0.838和0.835 (P<0.001).④PASCVC量表评定和专家评定两种方法分别建立判别函数,回代判别量表与专家判断的正确率分别为86.9%和85.1%;两种分级结果的一致性Kappa值为0.857 (P<0.001).结论 该量表具有较好的实证效度,可作为辨认和控制能力司法鉴定的客观评定工具.%Objective To test the cut-off point and empirical validity of psychiatric assessment scale of cognitive and volition capacity for suspects in crime (PASCVC).Methods One thousand of forensic psychiatry cases from fifteen bodies of the seven administrative regions in China were collected for forensic assessment by the three scales of PASCVC,DCRRS and CRRSV in August 2009 to December 201 l.in all cases by the appraiser to make six grade judgment of the cognitive and volition capacity including completely lost

  3. 疑似糖尿病患者中HbA1c诊断糖尿病应用价值及其切点研究%Validity and Cut-off Point of HbA1c for Early Detection of Suspected Patients with Diabetes Mellitus

    Institute of Scientific and Technical Information of China (English)

    梁国威; 何美琳; 徐旭; 邵冬华

    2012-01-01

    % ). Analysis by Receiver operator characteristic curve for diabetes diagnosis, showed that the area under the curve (AUC) was 0.881 of HbAl c (95% CI: 0.861 -0.900), which was equivalent to that of fasting blood glucose (FPG) (AUC: 0.899, 95% CI; 0.880-0.9160, P=0.205). The sensitivity of using HbAlc ≥ 6. 2% (79.2% ) as the diabetes diagnosis criterion was significantly higher than using FPG≥7.0 mmol/L (65.8% ) or HbAlc≥6.5% (67.4% ). Conclusion HbAlc measurement is suitable for diabetes diagnosis when FPG or OGTT is not available. An HbAl c threshold of 6. 2% is an optimal cut - off point for diabetes diagnosis.

  4. Strain effects on the performance of zero-Schottky-barrier double-walled carbon nanotube transistors

    Science.gov (United States)

    Wahab, Md. Abdul; Khosru, Quazi D. M.

    2010-08-01

    Schrodinger's equation is solved using recursive Green's function algorithm self-consistently with Poisson's equation to study the transport physics of uniaxial and torsional strained double-walled (DW) carbon nanotube (CNT) field-effect transistors (FETs) and to analyze their performance. The characteristics and performance of proposed DW CNTFET are compared with existing single-walled (SW) CNTFET. The strain has great impact on the I-V characteristics of both SW and DW CNT devices. Tensile and torsional strains improve greatly the off-state current and on/off current ratio of both devices. Compressive strain improves on-state current, but this improvement is comparatively small. The effect of strain on off-state current, on-state current, and on/off current ratio is higher in SW CNTFET. The inverse subthreshold slope of DW CNTFET is better than SW CNTFET. But the variation in inverse subthreshold slope with strain is smaller in DW CNTFET. Unlike SW CNTFET the on-state transconductance of DW CNTFET improves with tensile and torsional strains, and degrades with compressive strain. The on-state cut-off frequency of DW CNTFET also shows opposite behavior to SW CNTFET with strain following on-state transconductance. Concrete Physical description is provided to explain all above changes with strain.

  5. Domain Walls on Singularities

    CERN Document Server

    Halyo, Edi

    2009-01-01

    We describe domain walls that live on $A_2$ and $A_3$ singularities. The walls are BPS if the singularity is resolved and non--BPS if it is deformed and fibered. We show that these domain walls may interpolate between vacua that support monopoles and/or vortices.

  6. Usefulness of pulse-wave doppler tissue sampling and dobutamine stress echocardiography for identification of false positive inferior wall defects in SPECT

    International Nuclear Information System (INIS)

    False positive inferior wall perfusion defects restrict the accuracy of SPECT in diagnosis of coronary artery disease (CAD). Pulse-Wave Tissue Doppler (PWTD) has been recently proposed to assess regional wall motion velocities. The objectives of this study were to evaluate the presence of CAD by using PWTD during dobutamine stress echocardiography (DSE) in patients with an inferior perfusion defect detected by SPECT and compare PWTD parameters of normal cases with patients who had inferior perfusion defect and CAD. Sixty-five patients (mean age 58±8 years, 30 men) with a normal LV systolic function at rest according to echocardiographic evaluation with an inferior ischemia determined by SPECT and a control group (CG) of 34 normal cases (mean age 56±7 years, 16 men) were included in this study. All patients underwent a standard DSE (up to 40 μg/kg/min with additional atropine during sub-maximum heart rate responses). Pulse-wave Doppler tissue sampling of inferior wall was performed in the apical 2-chamber view at rest and stress. The coronary angiography was performed within 24 hours. The results were evaluated for the prediction of significant right coronary artery (RCA) and/or left circumflex coronary artery (CX) with narrowing (≥50% diameter stenosis, assessed by quantitative coronary angiography). It was observed that the peak stress mean E/A ratio was lower in patients with CAD when compared to patients without CAD (0.78±0.2 versus 1.29±0.11 p<0.0001). Also the peak stress E/A ratio of normal cases was significantly higher than patients who had CAD (1.19±0.3 versus 0.78±0.2 p<0.0001). When the cut off point for the E/A ratio was determined as 1, the sensitivity and specificity of dobutamine stress PWTD E/A were 89% and 86%, respectively. The peak stress E/A ratio was higher than 1 in all patients with a false positive perfusion defect. Systolic S velocity increase during DSE was significantly lower in patients with CAD (54%±17 versus 99%±24 p=0

  7. International Divider Walls

    NARCIS (Netherlands)

    Kruis, A.; Sneller, A.C.W.(L.)

    2013-01-01

    The subject of this teaching case is the Enterprise Resource Planning (ERP) system implementation at International Divider Walls, the world market leader in design, production, and sales of divider walls. The implementation in one of the divisions of this multinational company had been successful, a

  8. Thin Wall Iron Castings

    Energy Technology Data Exchange (ETDEWEB)

    J.F. Cuttino; D.M. Stefanescu; T.S. Piwonka

    2001-10-31

    Results of an investigation made to develop methods of making iron castings having wall thicknesses as small as 2.5 mm in green sand molds are presented. It was found that thin wall ductile and compacted graphite iron castings can be made and have properties consistent with heavier castings. Green sand molding variables that affect casting dimensions were also identified.

  9. Timber frame walls

    DEFF Research Database (Denmark)

    Hansen, Ernst Jan de Place; Brandt, Erik

    2010-01-01

    A ventilated cavity is usually considered good practice for removing moisture behind the cladding of timber framed walls. Timber frame walls with no cavity are a logical alternative as they are slimmer and less expensive to produce and besides the risk of a two-sided fire behind the cladding is...

  10. The Humming Wall

    DEFF Research Database (Denmark)

    Morrison, Ann Judith; Manresa-Yee, Cristina; Jensen, Brian Walther Skovgaard; Eshraghi, Neda

    2016-01-01

    We observed interactions with The Humming Wall, a vibrotactile and vibroacoustic interactive artifact placed in an urban park. Prior studies have focused on interactivity with primarily vision based systems (or with this system, the interaction between the wall and a wearable vibrotactile vest...

  11. Skyrmions and domain walls

    OpenAIRE

    Piette, B.; Zakrzewski, W. J.

    1997-01-01

    We study the 3+1 dimensional Skyrme model with a mass term different from the usual one. We show that this new model possesses domain walls solutions. We describe how, in the equivalent 2+1 dimensional model, the Skyrmion is absorbed by the wall.

  12. Solar Walls in tsbi3

    DEFF Research Database (Denmark)

    Wittchen, Kim Bjarne

    tsbi3 is a user-friendly and flexible computer program, which provides support to the design team in the analysis of the indoor climate and the energy performance of buildings. The solar wall module gives tsbi3 the capability of simulating solar walls and their interaction with the building. This...... version, C, of tsbi3 is capable of simulating five types of solar walls say: mass-walls, Trombe-walls, double Trombe-walls, internally ventilated walls and solar walls for preheating ventilation air. The user's guide gives a description of the capabilities and how to simulate solar walls in tsbi3....

  13. A Q-switched multi-wavelength Brillouin erbium fiber laser with a single-walled carbon nanotube saturable absorber

    International Nuclear Information System (INIS)

    A Q-switched multi-wavelength Brillouin erbium fiber laser (MWBEFL) is demonstrated using a single-walled carbon nanotube–polyethylene oxide (SWCNT–PEO) saturable absorber (SA). The SA is fabricated by cutting off a small part of the developed SWCNT–PEO film and sandwiching it in between two FC/PC (fiber connector/physical contact) fiber connectors. Multi-wavelength combs with ten lasing lines and spacing of 0.158 nm are obtained by the use of 2 km long dispersion compensating fiber as the Brillouin gain medium and a four-port circulator to isolate and circulate the odd-order Stokes signals. Q-switched pulse trains with a repetition rate of 105.2 kHz and a pulse width of 0.996 μs are obtained in the proposed MWBEFL at a 1480 nm pump power of 120 mW and a Brillouin pump power of 5.4 dBm. (paper)

  14. First wall for NET

    International Nuclear Information System (INIS)

    In collaboration with ANSALDO and within the frame of the European Fusion Tecnology Task N1 (Plasma Facing Components Design Studies), ENEA has performed a design an manufacturing feasibility study for the first wall of the Next European Torus (NET) during its ''physics'' operation phase. The main design specifications are average neutron wall load=1 MW/m2, peak surface heat flux=0.4 MW/m2, total number of burn pulses=1*104, average burn pulse duration=100 s, average neutron fluence=0.03 MWy/m2, structure material=AISI 316L SA, coolant=H2O at 50/100 centigrates (in/out). The reference ENEA-ANSALDO design is based on the use of flat plates coupled by microbrazing to poloidal cooling tubes. The technological development work has led to the design and manufacturing of a representative NET first wall box segment (0.65x 0.25x0.15 m) mockup which will be tested in the 190 kW Thermal Fatique Test Facility at JRC-Ispra. In this paper, we report on the various aspects of the basic experimental and theoretical investigations on the plasma-wall interactions for adequate protection of the first wall against erosion, global stress analysis of the first wall box, thecnological tests on brazed joints, and disign and manufacturing of the first wall mockup

  15. Plasma-wall interactions

    International Nuclear Information System (INIS)

    The plasma wall interactions for two extreme cases, the 'vacuum model' and the 'cold gas blanket' are outlined. As a first step for understanding the plasma wall interactions the elementary interaction processes at the first wall are identified. These are energetic ion and neutral particle trapping and release, ion and neutral backscattering, ion sputtering, desorption by ions, photons and electrons and evaporation. These processes have only recently been started to be investigated in the parameter range of interest for fusion research. The few measured data and their extrapolation into regions not yet investigated are reviewed

  16. Automatic Wall Painting Robot

    OpenAIRE

    P.KEERTHANAA, K.JEEVITHA, V.NAVINA, G.INDIRA, S.JAYAMANI

    2013-01-01

    The Primary Aim Of The Project Is To Design, Develop And Implement Automatic Wall Painting Robot Which Helps To Achieve Low Cost Painting Equipment. Despite The Advances In Robotics And Its Wide Spreading Applications, Interior Wall Painting Has Shared Little In Research Activities. The Painting Chemicals Can Cause Hazards To The Human Painters Such As Eye And Respiratory System Problems. Also The Nature Of Painting Procedure That Requires Repeated Work And Hand Rising Makes It Boring, Time A...

  17. Plasma-wall interaction

    International Nuclear Information System (INIS)

    This document gathers the 43 slides presented in the framework of the week long lecture 'hot plasmas 2004' and dedicated to plasma-wall interaction in a tokamak. This document is divided into 4 parts: 1) thermal load on the wall, power extraction and particle recovery, 2) basic edge plasma physics, 3) processes that drive the plasma-solid interaction, and 4) material conditioning (surface treatment...) for ITER

  18. Conducting Wall Hall Thrusters

    Science.gov (United States)

    Goebel, Dan M.; Hofer, Richard R.; Mikellides, Ioannis G.; Katz, Ira; Polk, James E.; Dotson, Brandon

    2013-01-01

    A unique configuration of the magnetic field near the wall of Hall thrusters, called Magnetic Shielding, has recently demonstrated the ability to significantly reduce the erosion of the boron nitride (BN) walls and extend the life of Hall thrusters by orders of magnitude. The ability of magnetic shielding to minimize interactions between the plasma and the discharge chamber walls has for the first time enabled the replacement of insulating walls with conducting materials without loss in thruster performance. The boron nitride rings in the 6 kW H6 Hall thruster were replaced with graphite that self-biased to near the anode potential. The thruster efficiency remained over 60% (within two percent of the baseline BN configuration) with a small decrease in thrust and increase in Isp typical of magnetically shielded Hall thrusters. The graphite wall temperatures decreased significantly compared to both shielded and unshielded BN configurations, leading to the potential for higher power operation. Eliminating ceramic walls makes it simpler and less expensive to fabricate a thruster to survive launch loads, and the graphite discharge chamber radiates more efficiently which increases the power capability of the thruster compared to conventional Hall thruster designs.

  19. 三峡工程二期围堰防渗墙塑性混凝土特性%Characterisitics of plastic concrete for impervious core wall of TGP cofferdam Ⅱ

    Institute of Scientific and Technical Information of China (English)

    王迎春; 李家正; 朱冠美; 周守贤

    2001-01-01

    根据三峡工程二期围堰结构要求,提出了防渗墙墙体材料的技术指标。通过墙体材料筛选优化,推荐的塑性混凝土具有能适应堰体要求的各种性能。并对塑性混凝土进行了三轴测试和应力-应变计算分析以及现场监测,结果表明其性能达到了设计要求。经过一年多的运行考验,塑性混凝土防渗墙是安全的。%According to structural features of Three Gorges Project(TGP) cofferdam Ⅱ,technical indices of materials used for impervious core wall are presented. Through selecting and optimizing,the mix proportion of plastic concrete for core wall was recommended.Triaxial shear tests and stress-strain behaviour analysis were carried out on this material.In addition,laboratory study and in-situ monitoring results concluded that the properties of plastic concrete achieved all design requirements.Normal operation over one year proved the plastic concrete cut-off wall being safe.

  20. The Chlamydomonas cell wall: characterization of the wall framework

    OpenAIRE

    1985-01-01

    The cell wall of the biflagellate alga Chlamydomonas reinhardtii is a multilayered, extracellular matrix composed of carbohydrates and 20-25 polypeptides. To learn more about the forces responsible for the integrity of this cellulose-deficient cell wall, we have begun studies to identify and characterize the framework of the wall and to determine the effects of the cell wall-degrading enzyme, lysin, on framework structure and protein composition. In these studies we used walls released into t...

  1. Dynamics of magnetostatic wave solitons in the vicinity of frequency cut-off

    CERN Document Server

    Burlak, G; Koshevaya, S; Marquez-Aguilar, P

    2001-01-01

    Nonlinear dynamics of one-dimensional pulses of exchangeless backward volume magnetostatic waves propagating in thin ferrite films with a thickness 2l=(3-10) mu m is studied numerically. The Whitham's approach of taking into account the exact wave dispersion is utilized. It has been found that in the case of small wave numbers (0.02=0.1), the nonlinear wave dynamics coincides with results obtained earlier in the parabolic approximation for the wave dispersion. Two-dimensional dynamics of nonlinear pulses is also investigated briefly in the full dispersion approach. The collapse-like phenomena have been found there when the central wave number is chosen as k sub 0 l>=0.04.

  2. Overcoming the Cut-Off Charge Transfer Bandgaps at the PbS Quantum Dot Interface

    KAUST Repository

    El-Ballouli, Ala'a O.

    2015-11-17

    Light harvesting from large size of semiconductor PbS quantum dots (QDs) with a bandgap of less than 1 eV is one of the greatest challenges precluding the development of PbS QD-based solar cells because the interfacial charge transfer (CT) from such QDs to the most commonly used electron acceptor materials is very inefficient, if it occurs at all. Thus, an alternative electron-accepting unit with a new driving force for CT is urgently needed to harvest the light from large-sized PbS QDs. Here, a cationic porphyrin is utilized as a new electron acceptor unit with unique features that bring the donor–acceptor components into close molecular proximity, allowing ultrafast and efficient electron transfer for QDs of all sizes, as inferred from the drastic photoluminescence quenching and the ultrafast formation of the porphyrin anionic species. The time-resolved results clearly demonstrate the possibility of modulating the electron transfer process between PbS QDs and porphyrin moieties not only by the size quantization effect but also by the interfacial electrostatic interaction between the positively charged porphyrin and the negatively charged QDs. This approach provides a new pathway for engineering QD-based solar cells that make the best use of the diverse photons making up the Sun\\'s broad irradiance spectrum.

  3. From Newton's law to the linear Boltzmann equation without cut-off

    OpenAIRE

    Ayi, Nathalie

    2016-01-01

    We provide a rigorous derivation of the linear Boltzmann equation without cutoff starting from a system of particles interacting via a potential with infinite range as the number of particles N goes to infinity under the Boltzmann-Grad scaling. The main difficulty in our context is that, due to the infinite range of the potential, a non-integrable singularity appears in the angular collision kernel, making no longer valid the single-use of Lanford's strategy. Our proof relies then on a combin...

  4. Serum Cholesterol Level Nomograms for Iranian Population; Suggestion for National Cut-Offs

    OpenAIRE

    Mostafa Hosseini; Shervin Taslimi; Mahmoud Yousefifard; Fereshteh Asgari; Koorosh Etemad; Hamid Heidarian Miri; Ali Rafei; Jalil Koohpayehzadeh; Iman Navid; Mohammad Mehdi Gouya

    2013-01-01

    Background: High cholesterol levels are associated with increased risk of coronary heart disease and stroke. Understanding the distribution of serum cholesterol levels in each country is valuable index for use in public health planning. This study aimed to construct nomograms of total cholesterol (TC) levels and establish the cut-points specific to Iranian population. Methods: Data on serum TC levels of 19,630 non-institutionalized individuals aged 25–64 years from third national survey on no...

  5. Serum Cholesterol Level Nomograms for Iranian Population; Suggestion for National Cut-Offs

    Directory of Open Access Journals (Sweden)

    Mostafa Hosseini

    2013-02-01

    Full Text Available Background: High cholesterol levels are associated with increased risk of coronary heart disease and stroke. Understanding the distribution of serum cholesterol levels in each country is valuable index for use in public health planning. This study aimed to construct nomograms of total cholesterol (TC levels and establish the cut-points specific to Iranian population.Methods: Data on serum TC levels of 19,630 non-institutionalized individuals aged 25-64 years from third national survey on non-communicable diseases (SuRFNCD in 2007 were used to construct cholesterol nomograms. We proposed cutoff values for borderline and high TC levels based on rounded 75th and 90th percentiles in three age groups (25-34, 35-44 and 45-64 respectively.Results: Average yearly increase of TC for males up to the age of 45 and females up to 64 were 1.15 and 1.03 mg/dl, respectively. TC levels were higher in females. In males, cutoff values for "borderline and high" TC levels were 195 and 220 mg/dl in 25-34, 210 and 240 mg/d in 35-44 and 215 and 245 mg/dl in 45-64 years old individuals. In women, these values were 200 and 225 mg/dl in 25-34,215 and 240 mg/dl in 35-44 and 235 and 265 mg/dl in 45-64 years old individuals respectively.Conclusion: Since TC levels are different in two sexes and change with age, we proposed different cutoffs for sex and age group. We think these cutoffs could be used in national public health planning.

  6. Interstellar Flow Longitude from the Symmetry of the Pickup Ion Cut-off at 1 AU

    Science.gov (United States)

    Möbius, E.; Lee, M. A.; Drews, C.

    2015-12-01

    We provide a proof of concept that the pickup ion (PUI) cutoff speed variation with ecliptic longitude can provide the interstellar neutral (ISN) flow longitude {λ }{ISN∞ } outside the heliosphere with a precision of the order of 0.°1. We compare 2007-2014 STEREO A PLASTIC observations in the solar wind frame with a simple analytical cutoff model and perform a Pearson correlation of the cutoff as a function of longitude with those values mirrored about a location λM that slides in longitude. The resulting maximum correlation at λM = 255.°21 ± 0.°04 reflects the ISN upwind direction with a purely statistical uncertainty. This result is consistent with recent ISN flow longitude values, but a precision determination requires the evaluation of underlying systematic effects. Obtaining a precision ISN flow longitude is highly complementary to the IBEX ISN observations, which return a narrow tube in the ISN parameter space that couples flow speed and longitude tightly, but leaves a substantially larger error bar along the tube. The ISN flow provides one cardinal axis of the heliosphere, with a strong leverage on the plane subtended by the ISN velocity and the interstellar magnetic field vector, which controls the shape of the heliosphere and its interaction with the interstellar medium. In addition, a discussion about potential temporal variations of the ISN flow has started. Both issues require a precision determination of the ISN flow velocity over decade-long time intervals. ACE SWICS, STEREO PLASTIC, and SOHO CTOF PUI data allow such long-term studies over almost two decades.

  7. High Frequency Cut-off and Changing of Radio Emission Mechanism in Pulsars

    CERN Document Server

    Kontorovich, V M

    2012-01-01

    Pulsars are the fast rotating neutron stars with strong magnetic field emitting over a wide frequency range. In spite of the efforts during 40 years after the discovery of pulsars, the mechanism of their radio emission remains to be unknown so far. We propose a new approach to solving this problem. The object of our study is a sample of pulsars with a high-frequency break of the spectrum from Pushchino catalogue. A theoretical explanation of the observed dependence of the high-frequency break from the pulsar period is given. The dependence of the break position from the magnetic field is predicted. This explanation is based on a new mechanism for electron emission in the inner polar gap. Radiation occurs when electrons are accelerated in the electric field rising from zero at the star surface. Acceleration passes through a maximum and tends to zero when the electron velocity approaches the velocity of light. The all radiated power is allocated to the radio band. The averaging over the polar cap, with some nat...

  8. Sliding Wear Properties of Graphite as Sealing Materials for Cut off Hot Gas

    International Nuclear Information System (INIS)

    Sealing structure to prevent flowing hot gas into the driving device, located between the driving shaft and the liner of On-Off valve for controlling the hot gas flow path was studied. Wear occurs due to the constant movement of the driving shaft controlled by actuator on graphite as the sealing material. In this paper, the dynamic wear behavior in high temperature of graphite(HK-6) to be used as sealing material was evaluated. Reciprocating wear test was carried out for the graphite(HK-6) to the relative motion between shaft materials(W-25Re). The results of friction coefficient and specific wear rate according to contact load, sliding speed at room temperature and 485 .deg. C considering the actual operating environment were evaluated. Through the SEM analysis of the worn surface, third body as lubricant films were observed and lubricant effect of third body was considered

  9. Cut off values of waist circumference & associated cardiovascular risk in egyptians

    Directory of Open Access Journals (Sweden)

    Ibrahim M

    2011-08-01

    Full Text Available Abstract Background Recent guidelines stressed the need to adopt different values of waist circumference (WC measurements to define abdominal obesity in different ethnic groups. The aim of this study is to identify WC cutoff points in normotensive and hypertensive subjects which are diagnostic of abdominal obesity in a Middle Eastern population and the prevalence of abdominal obesity in a nationwide sample. Methods Data were collected during phase-2 of the Egyptians National Hypertension Project survey. Blood pressure, anthropometric measurements and laboratory studies were performed according to a standardized protocol by trained personnel. To derive the cutoff points for WC, we applied the factor analysis on CV risk factors: diabetes mellitus, decrease in HDL-C and increase in LDL-C, triglycerides and left ventricular mass index by echocardiography. Results The sample included 2313 individuals above the age of 25 years. WC values (mean ± SD were 88 ± 14 cm and 95 ± 14 cm for normotensive (NT and hypertensive (HT men respectively, and 89.6 ± 14.7 cm and 95.7 ± 15.9 cm for NT and HT women respectively. Applying factor analysis, the weighted average cutoff points were 93.5 cm for both NT and HT men and 91.5 and 92.5 cm for NT and HT women respectively. Based on these thresholds, the prevalence of abdominal obesity was 48% in men and 51.5% in women. Conclusion This is the first report of specific abdominal obesity cutoff points in a Middle Eastern country. The cutoff points were different from the Europid standards. There is a high prevalence rate of abdominal obesity among Egyptians which is associated with increased prevalence of cardiometabolic risk factors.

  10. Metabolic syndrome: no internationally defined standard cut-off value for waist circumference

    Institute of Scientific and Technical Information of China (English)

    Olabode Oladeinde

    2007-01-01

    @@ The metabolic syndrome (MS) is a cluster of interrelated risk factors of metabolic origin - metabolic risk factors that appear to directly promote the development of atherosclerotic cardiovascular disease and increase the risk of development of type 2 diabetes.

  11. Refining Game Addiction Questionnairs: Evidence for a natural cut-off point?

    DEFF Research Database (Denmark)

    Nielsen, Rune Kristian

    2013-01-01

    This paper presents data from a pilot study, which was designed to illuminate critical flaws in the currently used instruments used to measure the prevalence of ‘computer game addiction’. The study found that the prevalence rate could be set anywhere between 23% and 0,6% depending on how the data...... is unique in the field of prevalence studies of computer game addiction both in its design and its findings. The findings and conclusions need to be addressed by future research in the area....

  12. Arctic cut-off high drives the poleward shift of a new Greenland melting record

    Science.gov (United States)

    Tedesco, M.; Mote, T.; Fettweis, X.; Hanna, E.; Jeyaratnam, J.; Booth, J. F.; Datta, R.; Briggs, K.

    2016-06-01

    Large-scale atmospheric circulation controls the mass and energy balance of the Greenland ice sheet through its impact on radiative budget, runoff and accumulation. Here, using reanalysis data and the outputs of a regional climate model, we show that the persistence of an exceptional atmospheric ridge, centred over the Arctic Ocean, was responsible for a poleward shift of runoff, albedo and surface temperature records over the Greenland during the summer of 2015. New records of monthly mean zonal winds at 500 hPa and of the maximum latitude of ridge peaks of the 5,700+/-50 m isohypse over the Arctic were associated with the formation and persistency of a cutoff high. The unprecedented (1948-2015) and sustained atmospheric conditions promoted enhanced runoff, increased the surface temperatures and decreased the albedo in northern Greenland, while inhibiting melting in the south, where new melting records were set over the past decade.

  13. Appoximation of individual cascades with energies above the GZK cut-off

    Science.gov (United States)

    Kirillov, A.; Kirillov, I.

    Approximation of individual cascades of gigantic energies is the essential part of prime particle energy determination methods. Fluctuation of cascades and their distribution shapes were investigated on the base of sufficient number of MK simulated showers, as dependent on prime energy, zenit angle and registration method. Individual cascades were approximated with high accuracy using some special parameters. It enables to create convenient formulae for approximation of individual cascades. Quality of this approximation and applicability of the traditional approximation of mean cascades for estimation of individual giganticcascades are discussed.

  14. Axion domain wall baryogenesis

    Energy Technology Data Exchange (ETDEWEB)

    Daido, Ryuji; Kitajima, Naoya [Department of Physics, Tohoku University,Sendai 980-8578 (Japan); Takahashi, Fuminobu [Department of Physics, Tohoku University,Sendai 980-8578 (Japan); Kavli IPMU, TODIAS, University of Tokyo,Kashiwa 277-8583 (Japan)

    2015-07-28

    We propose a new scenario of baryogenesis, in which annihilation of axion domain walls generates a sizable baryon asymmetry. Successful baryogenesis is possible for a wide range of the axion mass and decay constant, m≃10{sup 8}–10{sup 13} GeV and f≃10{sup 13}–10{sup 16} GeV. Baryonic isocurvature perturbations are significantly suppressed in our model, in contrast to various spontaneous baryogenesis scenarios in the slow-roll regime. In particular, the axion domain wall baryogenesis is consistent with high-scale inflation which generates a large tensor-to-scalar ratio within the reach of future CMB B-mode experiments. We also discuss the gravitational waves produced by the domain wall annihilation and its implications for the future gravitational wave experiments.

  15. Double wall underground storage tank

    Energy Technology Data Exchange (ETDEWEB)

    Canaan, E.B. Jr.; Wiegand, J.R.; Bartlow, D.H.

    1993-07-06

    A double wall underground storage tank is described comprising: (a) a cylindrical inner wall, (b) a cylindrical outer wall comprising plastic resin and reinforcement fibers, and (c) a layer of spacer filaments wound around the inner wall, the spacer filaments separating the inner and outer walls, and the spacer filaments being at least partially surrounded by voids to enable liquids to flow along the filaments.

  16. Back Reaction from Walls

    CERN Document Server

    Di Dio, Enea; Durrer, Ruth

    2011-01-01

    We study the distance-redshift relation in a universe filled with 'walls' of pressure-less dust separated by under dense regions. We show that as long as the density contrast of the walls is small, or the diameter of the under dense regions is much smaller than the Hubble scale, the distance-redshift relation remains close to what is obtained in a Friedmann universe. However, when arbitrary density contrasts are allowed, every prescribed distance-redshift relation can be reproduced with such models.

  17. Occupy Wall Street

    DEFF Research Database (Denmark)

    Jensen, Michael J.; Bang, Henrik

    2013-01-01

    This article analyzes the political form of Occupy Wall Street on Twitter. Drawing on evidence contained within the profiles of over 50,000 Twitter users, political identities of participants are characterized using natural language processing. The results find evidence of a traditional oppositio......This article analyzes the political form of Occupy Wall Street on Twitter. Drawing on evidence contained within the profiles of over 50,000 Twitter users, political identities of participants are characterized using natural language processing. The results find evidence of a traditional...

  18. UWB Propagation through Walls

    Directory of Open Access Journals (Sweden)

    M. Hajek

    2006-04-01

    Full Text Available The propagation of ultra wide band (UWB signals through walls is analyzed. For this propagation studies, it is necessary to consider not only propagation at a single frequency but in the whole band. The UWB radar output signal is formed by both transmitter and antenna. The effects of antenna receiving and transmitting responses for various antenna types (such as small and aperture antennas are studied in the frequency as well as time domain. Moreover, UWB radar output signals can be substantially affected due to electromagnetic wave propagation through walls and multipath effects.

  19. Side-wall sampler

    Energy Technology Data Exchange (ETDEWEB)

    Morrison, B.

    1969-11-01

    A side-wall sampler which is capable of taking samples from the walls of test holes to a depth of 1,000 ft or more is described. Samples have been extracted from till, clay, silt, and fine- to coarse-grained sands in drift and nonindurated bedrock from more than 1,000 test holes in S. Saskatchewan. Side-hole sampling is faster and cheaper than conventional sampling methods and is ideally suited for geological investigations. Mineralogical paleonto- locical and radiocarbon analyses have been determined on side-hole cores.

  20. Fly on the Wall

    Science.gov (United States)

    Berry, Dave; Korpan, Cynthia

    2009-01-01

    This paper describes the implementation of a peer observation program at the University of Victoria called the Lecture Club. The observers are not interactive during the class--they are the proverbial flies on the wall. The paper identifies the program as self-developmental, discussing the attributes of this learning-to-teach and peer-sharing…

  1. Endometriosis Abdominal wall

    International Nuclear Information System (INIS)

    Endometriosis of abdominal wall is a rare entity wi ch frequently appears after gynecological surgery. Case history includes three cases of parietal endometriosis wi ch were treated in Maciel Hospital of Montevideo. The report refers to etiological diagnostic aspects and highlights the importance of total resection in order to achieve definitive healing

  2. Anterior vaginal wall repair

    Science.gov (United States)

    ... symptoms will go away. This improvement will often last for years. Alternative Names A/P repair; Vaginal wall repair; Anterior and/ ... writing by ADAM Health Solutions. About MedlinePlus Site Map FAQs Contact ... Institutes of Health Page last updated: 23 August 2016

  3. The Invisible Wall.

    Science.gov (United States)

    Zenger, John H.

    1997-01-01

    The barrier to a company's performance may be a conflict of organizational values and culture with those of the training profession. Elements of this value system that create the invisible wall are egalitarianism, people focus, "guerilla" training tactics, and emphasis on human interaction. (JOW)

  4. Moisture Research - Optimizing Wall Assemblies

    Energy Technology Data Exchange (ETDEWEB)

    Arena, Lois [Consortium for Advanced Residential Buildings (CARB), Norwalk, CT (United States); Mantha, Pallavi [Consortium for Advanced Residential Buildings (CARB), Norwalk, CT (United States)

    2013-05-01

    In this project, the Consortium for Advanced Residential Buildings (CARB) team evaluated several different configurations of wall assemblies to determine the accuracy of moisture modeling and make recommendations to ensure durable, efficient assemblies. WUFI and THERM were used to model the hygrothermal and heat transfer characteristics of these walls. Wall assemblies evaluated included code minimum walls using spray foam insulation and fiberglass batts, high R-value walls at least 12 in. thick (R-40 and R-60 assemblies), and brick walls with interior insulation.

  5. Rising damp in building walls: the wall base ventilation system

    Science.gov (United States)

    Guimarães, A. S.; Delgado, J. M. P. Q.; de Freitas, V. P.

    2012-12-01

    This work intends to validate a new system for treating rising damp in historic buildings walls. The results of laboratory experiments show that an efficient way of treating rising damp is by ventilating the wall base, using the HUMIVENT technique. The analytical model presented describes very well the observed features of rising damp in walls, verified by laboratory tests, who contributed for a simple sizing of the wall base ventilation system that will be implemented in historic buildings.

  6. High-R Walls for Remodeling: Wall Cavity Moisture Monitoring

    Energy Technology Data Exchange (ETDEWEB)

    Wiehagen, J.; Kochkin, V.

    2012-12-01

    The focus of the study is on the performance of wall systems, and in particular, the moisture characteristics inside the wall cavity and in the wood sheathing. Furthermore, while this research will initially address new home construction, the goal is to address potential moisture issues in wall cavities of existing homes when insulation and air sealing improvements are made.

  7. High-R Walls for Remodeling. Wall Cavity Moisture Monitoring

    Energy Technology Data Exchange (ETDEWEB)

    Wiehagen, J. [NAHB Research Center Industry Partnership, Upper Marlboro, MD (United States); Kochkin, V. [NAHB Research Center Industry Partnership, Upper Marlboro, MD (United States)

    2012-12-01

    The focus of the study is on the performance of wall systems, and in particular, the moisture characteristics inside the wall cavity and in the wood sheathing. Furthermore, while this research will initially address new home construction, the goal is to address potential moisture issues in wall cavities of existing homes when insulation and air sealing improvements are made.

  8. Automatic Wall Painting Robot

    Directory of Open Access Journals (Sweden)

    P.KEERTHANAA, K.JEEVITHA, V.NAVINA, G.INDIRA, S.JAYAMANI

    2013-07-01

    Full Text Available The Primary Aim Of The Project Is To Design, Develop And Implement Automatic Wall Painting Robot Which Helps To Achieve Low Cost Painting Equipment. Despite The Advances In Robotics And Its Wide Spreading Applications, Interior Wall Painting Has Shared Little In Research Activities. The Painting Chemicals Can Cause Hazards To The Human Painters Such As Eye And Respiratory System Problems. Also The Nature Of Painting Procedure That Requires Repeated Work And Hand Rising Makes It Boring, Time And Effort Consuming. When Construction Workers And Robots Are Properly Integrated In Building Tasks, The Whole Construction Process Can Be Better Managed And Savings In Human Labour And Timing Are Obtained As A Consequence. In Addition, It Would Offer The Opportunity To Reduce Or Eliminate Human Exposure To Difficult And Hazardous Environments, Which Would Solve Most Of The Problems Connected With Safety When Many Activities Occur At The Same Time. These Factors Motivate The Development Of An Automated Robotic Painting System.

  9. Scalable Resolution Display Walls

    KAUST Repository

    Leigh, Jason

    2013-01-01

    This article will describe the progress since 2000 on research and development in 2-D and 3-D scalable resolution display walls that are built from tiling individual lower resolution flat panel displays. The article will describe approaches and trends in display hardware construction, middleware architecture, and user-interaction design. The article will also highlight examples of use cases and the benefits the technology has brought to their respective disciplines. © 1963-2012 IEEE.

  10. In a walled garden

    OpenAIRE

    Mullaniff, Kathleen

    2009-01-01

    Mullaniff exhibited one painting from the series, ‘in a walled garden’. These works are based on a Victorian garden at St Leonards on Sea. An investigation into the history of the house and garden built 1860. This research endeavors to explore the progression of restoring the original Victorian garden, as recorded through the painting and drawing process This involves forming links between the past domestic histories and the current site. The research is based on the botanical paintings of Ma...

  11. Light shining through walls

    Energy Technology Data Exchange (ETDEWEB)

    Redondo, Javier [Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany); Max-Planck-Institut fuer Physik, Muenchen (Germany); Ringwald, Andreas [Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany)

    2010-11-15

    Shining light through walls? At first glance this sounds crazy. However, very feeble gravitational and electroweak effects allow for this exotic possibility. Unfortunately, with present and near future technologies the opportunity to observe light shining through walls via these effects is completely out of question. Nevertheless there are quite a number of experimental collaborations around the globe involved in this quest. Why are they doing it? Are there additional ways of sending photons through opaque matter? Indeed, various extensions of the standard model of particle physics predict the existence of new particles called WISPs - extremely weakly interacting slim particles. Photons can convert into these hypothetical particles, which have no problems to penetrate very dense materials, and these can reconvert into photons after their passage - as if light was effectively traversing walls. We review this exciting field of research, describing the most important WISPs, the present and future experiments, the indirect hints from astrophysics and cosmology pointing to the existence of WISPs, and finally outlining the consequences that the discovery of WISPs would have. (orig.)

  12. Light shining through walls

    International Nuclear Information System (INIS)

    Shining light through walls? At first glance this sounds crazy. However, very feeble gravitational and electroweak effects allow for this exotic possibility. Unfortunately, with present and near future technologies the opportunity to observe light shining through walls via these effects is completely out of question. Nevertheless there are quite a number of experimental collaborations around the globe involved in this quest. Why are they doing it? Are there additional ways of sending photons through opaque matter? Indeed, various extensions of the standard model of particle physics predict the existence of new particles called WISPs - extremely weakly interacting slim particles. Photons can convert into these hypothetical particles, which have no problems to penetrate very dense materials, and these can reconvert into photons after their passage - as if light was effectively traversing walls. We review this exciting field of research, describing the most important WISPs, the present and future experiments, the indirect hints from astrophysics and cosmology pointing to the existence of WISPs, and finally outlining the consequences that the discovery of WISPs would have. (orig.)

  13. Study on milling surface quality of the aerospace thin-walled parts%航空薄壁框类零件铣削加工表面质量研究

    Institute of Scientific and Technical Information of China (English)

    李初晔; 孙彩霞; 王增新

    2012-01-01

    刀具—薄壁深腔框类零件是一个弱刚性系统,在铣削力作用下,刀具及框类零件的薄壁结构发生挠曲,出现欠切与过切,从而使加工厚度产生偏差,严重影响工件加工精度和表面质量.首先介绍铣削力的计算方法,在此基础上研究刀具弯曲、壁板挠曲对加工表面质量的影响.采用有限元法依次计算任意加工点处刀具及壁板的刚度,推导铣削薄壁框类零件时厚度偏差的计算,提出极限铣削力概念.通过数值算例,研究减小加工偏差的方法,提高航空薄壁零件加工精度.%Tool-thin wall deep cavity box parts is a weak stiffness system, deflection of the cutter and box-type thin-walled structures occurred under the action of the milling force, appear due to cut and cut off, so that process thicknesses error, seriously affect the accuracy and surface quality of workpiece. First introduced the cutting force calculation method, based on this study of tool bending and wall deflection impact on surface quality. Using finite element, compute in turn the stiffness of the tool and the wall at any milling point, derive the thickness deviation calculation method, proposed the concept of cutting force limit. By reducing the processing of numerical examples study of error methods to improve aerospace thin-walled precision parts.

  14. Canal Wall Reconstruction Mastoidectomy

    Institute of Scientific and Technical Information of China (English)

    2007-01-01

    Objective To investigate the advantages of canal wall reconstruction (CWR) mastoidectomy, a single-stage technique for cholesteatoma removal and posterior external canal wall reconstruction, over the open and closed procedures in terms of cholesteatoma recurrence. Methods: Between June 2002 and December 2005, 38 patients (40 ears) with cholesteatoma were admited to Sun Yat-Sen Memorial Hospital and received surgical treatments. Of these patients, 25 were male with ages ranging between 11 and 60 years (mean = 31.6 years) and 13 were female with ages ranging between 20 and 65 years (mean = 38.8 years). Canal wall reconstruction (CWR)mastoidectomy was performed in 31 ears and canal wall down (CWD) mastoidectomy in 9 ears. Concha cartilage was used for ear canal wall reconstruction in 22 of the 31 CWR procedures and cortical mastoid bone was used in the remaining 9 cases. Results At 0.5 to 4 years follow up, all but one patients remained free of signs of cholesteatoma recurrence, i.e., no retraction pocket or cholesteatoma matrix. One patient, a smoker, needed revision surgery due to cholesteatoma recurrence 1.5 year after the initial operation. The recurrence rate was therefore 3.2% (1/31). Cholesteatoma recurrence was monitored using postoperative CT scans whenever possible. In the case that needed a revision procedure, a retraction pocket was identified by otoendoscopy in the pars flacida area that eventually evolved into a cholesteatoma. A pocket extending to the epitympanum filled with cholesteatoma matrix was confirmed during the revision operation, A decision to perform a modified mastoidectomy was made as the patient refused to quit smoking. The mean air-bone gap in pure tone threshold was 45 dB before surgery and 25 dB after (p < 0.05). There was no difference between using concha cartilage and cortical mastoid bone for the reconstruction regarding air-bone gap improvement, CT findings and otoendoscopic results. Conclusion CWR mastoidectomy can be used for

  15. Cell Wall Biology: Perspectives from Cell Wall Imaging

    Institute of Scientific and Technical Information of China (English)

    Kieran J.D.Lee; Susan E.Marcus; J.Paul Knox

    2011-01-01

    Polysaccharide-rich plant cell walls are important biomaterials that underpin plant growth,are major repositories for photosynthetically accumulated carbon,and,in addition,impact greatly on the human use of plants. Land plant cell walls contain in the region of a dozen major polysaccharide structures that are mostly encompassed by cellulose,hemicelluloses,and pectic polysaccharides. During the evolution of land plants,polysaccharide diversification appears to have largely involved structural elaboration and diversification within these polysaccharide groups. Cell wall chemistry is well advanced and a current phase of cell wall science is aimed at placing the complex polysaccharide chemistry in cellular contexts and developing a detailed understanding of cell wall biology. Imaging cell wall glycomes is a challenging area but recent developments in the establishment of cell wall molecular probe panels and their use in high throughput procedures are leading to rapid advances in the molecular understanding of the spatial heterogeneity of individual cell walls and also cell wall differences at taxonomic levels. The challenge now is to integrate this knowledge of cell wall heterogeneity with an understanding of the molecular and physiological mechanisms that underpin cell wall properties and functions.

  16. Correlations of coronary plaque wall thickness with wall pressure and wall pressure gradient: a representative case study

    OpenAIRE

    Liu Biyue; Zheng Jie; Bach Richard; Tang Dalin

    2012-01-01

    Abstract Background There are two major hemodynamic stresses imposed at the blood arterial wall interface by flowing blood: the wall shear stress (WSS) acting tangentially to the wall, and the wall pressure (WP) acting normally to the wall. The role of flow wall shear stress in atherosclerosis progression has been under intensive investigation, while the impact of blood pressure on plaque progression has been under-studied. Method The correlations of wall thickness (WT) with wall pressure (WP...

  17. Forward Wall Detector

    International Nuclear Information System (INIS)

    The Forward Wall Detector is designed to identify projectile like fragments from heavy ion reactions at CELSIUS storage ring in Uppsala, Sweden. The FWD consist of 96 detection modules covering azimuthal angle from 3.9o to 11.7o with efficiency of 81%. The detection module can be either of phoswitch type (10 mm fast plastic + 80 mm CsI(Tl)) or standard ΔE-E telescope (750 μm Si + 88 mm CsI(Tl)). It is expected to have charge identification up to Z=18, mass resolution for H and He isotopes and energy resolution ∼ 8%. (author)

  18. Walls shielding against ionizing radiation

    International Nuclear Information System (INIS)

    These specifications are to help the users of lead bricks as under DIN 25407, leaf 1, with the construction of walls shielding against ionizing radiation by examples for the uses of the different types of lead bricks and by recommendations for the construction of shielding walls and for the determination of the wall thickness necessary for shielding against γ-radiation as a function of energy. (orig./AK)

  19. Dynamics of monopole walls

    Energy Technology Data Exchange (ETDEWEB)

    Maldonado, R., E-mail: rafael.maldonado@durham.ac.uk; Ward, R.S., E-mail: richard.ward@durham.ac.uk

    2014-06-27

    The moduli space of centred Bogomolny–Prasad–Sommerfield 2-monopole fields is a 4-dimensional manifold M with a natural metric, and the geodesics on M correspond to slow-motion monopole dynamics. The best-known case is that of monopoles on R{sup 3}, where M is the Atiyah–Hitchin space. More recently, the case of monopoles periodic in one direction (monopole chains) was studied a few years ago. Our aim in this note is to investigate M for doubly-periodic fields, which may be visualized as monopole walls. We identify some of the geodesics on M as fixed-point sets of discrete symmetries, and interpret these in terms of monopole scattering and bound orbits, concentrating on novel features that arise as a consequence of the periodicity.

  20. Dynamics of monopole walls

    International Nuclear Information System (INIS)

    The moduli space of centred Bogomolny–Prasad–Sommerfield 2-monopole fields is a 4-dimensional manifold M with a natural metric, and the geodesics on M correspond to slow-motion monopole dynamics. The best-known case is that of monopoles on R3, where M is the Atiyah–Hitchin space. More recently, the case of monopoles periodic in one direction (monopole chains) was studied a few years ago. Our aim in this note is to investigate M for doubly-periodic fields, which may be visualized as monopole walls. We identify some of the geodesics on M as fixed-point sets of discrete symmetries, and interpret these in terms of monopole scattering and bound orbits, concentrating on novel features that arise as a consequence of the periodicity

  1. Dynamics of monopole walls

    CERN Document Server

    Maldonado, R

    2014-01-01

    The moduli space of centred Bogomolny-Prasad-Sommmerfield 2-monopole fields is a 4-dimensional manifold M with a natural metric, and the geodesics on M correspond to slow-motion monopole dynamics. The best-known case is that of monopoles on R^3, where M is the Atiyah-Hitchin space. More recently, the case of monopoles periodic in one direction (monopole chains) was studied a few years ago. Our aim in this note is to investigate M for doubly-periodic fields, which may be visualized as monopole walls. We identify some of the geodesics on M as fixed-point sets of discrete symmetries, and interpret these in terms of monopole scattering and bound orbits, concentrating on novel features that arise as a consequence of the periodicity.

  2. Great Wall of China

    Science.gov (United States)

    2001-01-01

    This ASTER sub-image covers a 12 x 12 km area in northern Shanxi Province, China, and was acquired January 9, 2001. The low sun angle, and light snow cover highlight a section of the Great Wall, visible as a black line running diagonally through the image from lower left to upper right. The Great Wall is over 2000 years old and was built over a period of 1000 years. Stretching 4500 miles from Korea to the Gobi Desert it was first built to protect China from marauders from the north.This image is located at 40.2 degrees north latitude and 112.8 degrees east longitude.Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) is one of five Earth-observing instruments launched December 18, 1999, on NASA's Terra satellite. The instrument was built by Japan's Ministry of International Trade and Industry. A joint U.S./Japan science team is responsible for validation and calibration of the instrument and the data products. Dr. Anne Kahle at NASA's Jet Propulsion Laboratory, Pasadena, Calif., is the U.S. Science team leader; Moshe Pniel of JPL is the project manager. ASTER is the only high resolution imaging sensor on Terra. The primary goal of the ASTER mission is to obtain high-resolution image data in 14 channels over the entire land surface, as well as black and white stereo images. With revisit time of between 4 and 16 days, ASTER will provide the capability for repeat coverage of changing areas on Earth's surface.The broad spectral coverage and high spectral resolution of ASTER will provide scientists in numerous disciplines with critical information for surface mapping, and monitoring dynamic conditions and temporal change. Example applications are: monitoring glacial advances and retreats, monitoring potentially active volcanoes, identifying crop stress, determining cloud morphology and physical properties, wetlands Evaluation, thermal pollution monitoring, coral reef degradation, surface temperature mapping of soils and geology, and measuring surface

  3. Domain wall networks on solitons

    International Nuclear Information System (INIS)

    Domain wall networks on the surface of a soliton are studied in a simple theory. It consists of two complex scalar fields, in 3+1 dimensions, with a global U(1)xZn symmetry, where n>2. Solutions are computed numerically in which one of the fields forms a Q ball and the other field forms a network of domain walls localized on the surface of the Q ball. Examples are presented in which the domain walls lie along the edges of a spherical polyhedron, forming junctions at its vertices. It is explained why only a small restricted class of polyhedra can arise as domain wall networks

  4. Moisture Research - Optimizing Wall Assemblies

    Energy Technology Data Exchange (ETDEWEB)

    Arena, L.; Mantha, P.

    2013-05-01

    The Consortium for Advanced Residential Buildings (CARB) evaluated several different configurations of wall assemblies to determine the accuracy of moisture modeling and make recommendations to ensure durable, efficient assemblies. WUFI and THERM were used to model the hygrothermal and heat transfer characteristics of these walls.

  5. Dry wall Kras 2011

    Directory of Open Access Journals (Sweden)

    Domen Zupančič

    2012-01-01

    Full Text Available Despite the modesty of hiska, they show a simple understanding of corbelling technique. One could say they are all examples of human landscape cultivation. Although there is no evident common line when comparing all types of hiska, the cunning eye may observe one shared feature: the positioning of the entrance. More or less all the documented shelters have south or south-western facing entrances. The burja is a cold northerly wind; from the south (Adriatic Sea the winds are warmer. When resting, the setting sun is taken as a sign of the ending of the working day and a reward for the whole day’s efforts. Entrances are the only openings to these structures, and they should serve as well as possible - to watch over the crops, to wait when hunting, to enjoy the calm of evening light, to breathe the sea wind.The syntax of the architectural language of layering stone and shaping the pattern of the landscape remain an inventive realisation of spatial ideas from the past until today. Not only ideas of shaping space - these ideas are basic interventions in the natural habitat which contribute to survival. Culture and an awareness of its values are the origins of local development and reasonable heritage preservation. The next step are tutorial days with workshops on how to build dry stone structures, walls and other stone architecture, as the DSWA organisation in the UK is doing.

  6. Pharmacy without walls.

    Science.gov (United States)

    Shane, R R

    1996-02-15

    Attributes of excellence in pharmacy management are described: big-picture thinking, the ability to exploit change, and willingness to take risks. Big-picture thinking means understanding trends that are shaping health care in order to determine where pharmacy fits. Health systems look beyond inpatient care and use case managers to maximize resource use; pharmacists might serve as case managers. Managed care has caused physicians to be more receptive to resource-management strategies, such as clinical pathways; pharmacists can collaborate in the development of clinical pathways. Pharmacists can serve as physician extenders; for example, by conducting anticoagulation or hypertension clinics. Pharmacists need flexibility to adapt to changes in the internal organization of acute care institutions; they will need to learn about the clinical, behavioral, operational, and fiscal aspects of managing the total patient. New reporting relationships give pharmacists the opportunity to demonstrate to other members of the health care team their role in preventing, managing, and resolving drug-related problems throughout the continuum of care. Risk-taking can mean setting ambitious goals. By setting and achieving ambitious goals for products and services, pharmacists can raise patients' and other health care providers' expectations for pharmacy services. Pharmacists' success will depend on their willingness to experiment with new services and discard services that do not substantially advance patient care. Pharmacists must monitor changes in the provision of health care, determine the implications for their practice and seek opportunities for participation outside the walls within which they have traditionally practiced. PMID:8673664

  7. Economics of abdominal wall reconstruction.

    Science.gov (United States)

    Bower, Curtis; Roth, J Scott

    2013-10-01

    The economic aspects of abdominal wall reconstruction are frequently overlooked, although understandings of the financial implications are essential in providing cost-efficient health care. Ventral hernia repairs are frequently performed surgical procedures with significant economic ramifications for employers, insurers, providers, and patients because of the volume of procedures, complication rates, the significant rate of recurrence, and escalating costs. Because biological mesh materials add significant expense to the costs of treating complex abdominal wall hernias, the role of such costly materials needs to be better defined to ensure the most cost-efficient and effective treatments for ventral abdominal wall hernias. PMID:24035086

  8. Partial domain wall partition functions

    OpenAIRE

    Foda, O.; Wheeler, M.

    2012-01-01

    We consider six-vertex model configurations on an n-by-N lattice, n =< N, that satisfy a variation on domain wall boundary conditions that we define and call "partial domain wall boundary conditions". We obtain two expressions for the corresponding "partial domain wall partition function", as an (N-by-N)-determinant and as an (n-by-n)-determinant. The latter was first obtained by I Kostov. We show that the two determinants are equal, as expected from the fact that they are partition functions...

  9. Cell wall proteomics of crops

    OpenAIRE

    Komatsu, Setsuko; Yanagawa, Yuki

    2013-01-01

    Cell wall proteins play key roles in cell structure and metabolism, cell enlargement, signal transduction, responses to environmental stress, and many other physiological events. Agricultural crops are often used for investigating stress tolerance because cultivars with differing degrees of tolerance are available. Abiotic and biotic stress factors markedly influence the geographical distribution and yields of many crop species. Crop cell wall proteomics is of particular importance for improv...

  10. Momentum balance in wall jets

    Science.gov (United States)

    Johansson, T. Gunnar; Mehdi, Faraz; Naughton, Jonathan W.

    2012-11-01

    A plane wall jet experiment has been done to study its momentum balance. Two component laser Doppler anemometry was used to simultaneously measure the axial and wall-normal velocity components in 6 axial positions (x/H= 25, 50, 75, 100, 125 and 150) spanning from the wall all the way well into the ambient stagnant area. In this way not only the mean velocity components and Reynolds normal and shear stresses but also all their spatial derivatives were determined. In addition the wall shear stress was measured in all six axial positions using oil film interferometry. From these data all terms in the x-momentum equation, except the pressure term, could be evaluated. Later also the pressure was measured in the same profiles, and thereby also the pressure term was included in the balance. Contrary to common belief it was found that the pressure was not constant in the wall jet. The complete momentum balance is discussed and used to evaluate the roles played by the different contributing terms in different regions of the flow field in an effort to improve on our understanding of the mechanics of wall jets.

  11. WallProtDB, a database resource for plant cell wall proteomics

    OpenAIRE

    San Clemente, Hélène; Jamet, Elisabeth

    2015-01-01

    Background During the last fifteen years, cell wall proteomics has become a major research field with the publication of more than 50 articles describing plant cell wall proteomes. The WallProtDB database has been designed as a tool to facilitate the inventory, the interpretation of cell wall proteomics data and the comparisons between cell wall proteomes. Results WallProtDB (http://www.polebio.lrsv.ups-tlse.fr/WallProtDB/) presently contains 2170 proteins and ESTs identified experimentally i...

  12. MHD Electrode and wall constructions

    Science.gov (United States)

    Way, Stewart; Lempert, Joseph

    1984-01-01

    Electrode and wall constructions for the walls of a channel transmitting the hot plasma in a magnetohydrodynamic generator. The electrodes and walls are made of a plurality of similar modules which are spaced from one another along the channel. The electrodes can be metallic or ceramic, and each module includes one or more electrodes which are exposed to the plasma and a metallic cooling bar which is spaced from the plasma and which has passages through which a cooling fluid flows to remove heat transmitted from the electrode to the cooling bar. Each electrode module is spaced from and electrically insulated from each adjacent module while interconnected by the cooling fluid which serially flows among selected modules. A wall module includes an electrically insulating ceramic body exposed to the plasma and affixed, preferably by mechanical clips or by brazing, to a metallic cooling bar spaced from the plasma and having cooling fluid passages. Each wall module is, similar to the electrode modules, electrically insulated from the adjacent modules and serially interconnected to other modules by the cooling fluid.

  13. Functional domain walls in multiferroics

    Science.gov (United States)

    Meier, Dennis

    2015-11-01

    During the last decade a wide variety of novel and fascinating correlation phenomena has been discovered at domain walls in multiferroic bulk systems, ranging from unusual electronic conductance to inseparably entangled spin and charge degrees of freedom. The domain walls represent quasi-2D functional objects that can be induced, positioned, and erased on demand, bearing considerable technological potential for future nanoelectronics. Most of the challenges that remain to be solved before turning related device paradigms into reality, however, still fall in the field of fundamental condensed matter physics and materials science. In this topical review seminal experimental findings gained on electric and magnetic domain walls in multiferroic bulk materials are addressed. A special focus is put on the physical properties that emerge at so-called charged domain walls and the added functionality that arises from coexisting magnetic order. The research presented in this review highlights that we are just entering a whole new world of intriguing nanoscale physics that is yet to be explored in all its details. The goal is to draw attention to the persistent challenges and identify future key directions for the research on functional domain walls in multiferroics.

  14. Do the cardiovascular risk profile and the degree of arterial wall calcification influence the performance of MDCT angiography of lower extremity arteries?

    International Nuclear Information System (INIS)

    To retrospectively assess the influence of arterial wall calcifications on the accuracy of run-off computed tomographic angiography (CTA) and to analyse whether cardiovascular risk factors are predictors of compromising calcifications. In 200 consecutive patients who underwent run-off CTA, calcifications were assessed in pelvic, thigh and calf arteries using a four-point scale. Fifty-nine patients with digital subtraction angiography (DSA) were assessed by both techniques to estimate a threshold of compromising calcifications, defined as a decrease of sensitivity, specificity, PPV or NPV below the lower 95% confidence interval of overall results. Regression analysis was performed to investigate a potential relationship between compromising calcifications and presence of cardiovascular risk factors, advanced patient age and severe peripheral arterial disease (PAD). The highest Ca++-score was chosen as the cut-off for the regression analysis, as a relevant decrease of specificity (0.91; overall: 0.95) above the knee and of sensitivity (0.66; overall: 0.83), specificity (0.65; overall: 0.93), positive predictive value (PPV) and negative predictive value (NPV) below the knee was observed. In the pelvic and thigh arteries, severe PAD (Fontaine Stage ≥III) showed the highest odds ratio for compromising calcifications (2.9), followed by diabetes mellitus (2.4), renal failure (2.1) and smoking (1.7). In the calf, renal failure (12.2) and diabetes mellitus (3.3) were the strongest predictors. Patients with diabetes and renal failure should be considered as candidates for alternative vessel imaging in order to avoid inconclusive examination results. (orig.)

  15. Do the cardiovascular risk profile and the degree of arterial wall calcification influence the performance of MDCT angiography of lower extremity arteries?

    Energy Technology Data Exchange (ETDEWEB)

    Meyer, B.C.; Werncke, T.; Foert, E.; Ribbe, C.; Wolf, K.J. [Charite-University Medicine, Department of Radiology and Nuclear Medicine, Berlin (Germany); Kruschewski, M. [Charite-University Medicine, Department of Surgery, Berlin (Germany); Hopfenmueller, W. [Charite-University Medicine, Department of Biometry and Clinical Epidemiology, Berlin (Germany); Albrecht, T. [Charite-University Medicine, Department of Radiology and Nuclear Medicine, Berlin (Germany); Vivantes Klinikum Neukoelln, Department of Radiology and Interventional Therapy, Berlin (Germany)

    2010-02-15

    To retrospectively assess the influence of arterial wall calcifications on the accuracy of run-off computed tomographic angiography (CTA) and to analyse whether cardiovascular risk factors are predictors of compromising calcifications. In 200 consecutive patients who underwent run-off CTA, calcifications were assessed in pelvic, thigh and calf arteries using a four-point scale. Fifty-nine patients with digital subtraction angiography (DSA) were assessed by both techniques to estimate a threshold of compromising calcifications, defined as a decrease of sensitivity, specificity, PPV or NPV below the lower 95% confidence interval of overall results. Regression analysis was performed to investigate a potential relationship between compromising calcifications and presence of cardiovascular risk factors, advanced patient age and severe peripheral arterial disease (PAD). The highest Ca{sup ++}-score was chosen as the cut-off for the regression analysis, as a relevant decrease of specificity (0.91; overall: 0.95) above the knee and of sensitivity (0.66; overall: 0.83), specificity (0.65; overall: 0.93), positive predictive value (PPV) and negative predictive value (NPV) below the knee was observed. In the pelvic and thigh arteries, severe PAD (Fontaine Stage {>=}III) showed the highest odds ratio for compromising calcifications (2.9), followed by diabetes mellitus (2.4), renal failure (2.1) and smoking (1.7). In the calf, renal failure (12.2) and diabetes mellitus (3.3) were the strongest predictors. Patients with diabetes and renal failure should be considered as candidates for alternative vessel imaging in order to avoid inconclusive examination results. (orig.)

  16. A contribution from dielectric analysis to the study of the formation of multi-wall carbon nanotubes percolated networks in epoxy resin under an electric field

    International Nuclear Information System (INIS)

    The formation of percolation networks in epoxy matrix nanocomposites reinforced with multi-wall carbon nanotubes (MWNT) during the curing process, at different MWNT contents, was studied by using a parallel plate cell subjected to a 300 V/cm AC electric field at 1 kHz. The percolation was verified by the electrical current output measured during and after the resin curing. The behavior of electric dipoles was characterized by impedance spectroscopy and followed the Debye first order dispersion model, by which an average relaxation time of 6.0 × 10−4 s and a cut-off frequency of 1.7 kHz were experimentally found. By applying the theory of percolation, a critical probability, pc, equal to 0.038 vol% and an exponent of conductivity of 2.0 were found. Both aligned and random samples showed dipole relaxation times typical of interfacial and/or charge-hopping polarization, while the permittivity exhibited an exponential decrease with frequency. This behavior can be related to the increased ability to trap electrical charges due to the formation of the carbon nanotubes network. Optical and electron microscopies confirm the theoretical prediction that the application of an electric field during cure helps the process of MWNT debundling in epoxy resin. - Highlights: • We report the formation of percolating networks of MWNTs under AC electric field. • MWNT/epoxy dielectric properties were measured by impedance spectroscopy. • Lower percolation thresholds were obtained for composites with aligned CNTs. • Application of AC electric field helps the debundling of CNTs. • CNT/Epoxy with percolated networks presents interfacial and hopping polarizations

  17. The feasibility of removable prefab diaphragm walls

    NARCIS (Netherlands)

    Amaarouk, R.; De Gijt, J.G.; Braam, C.R.

    2013-01-01

    A diaphragm wall is a cast in-situ reinforced concrete retaining wall applied in, among others, quay walls. The main advantages of this type of retaining wall are that it can be made in almost every preferred length and that it can resist high structural loads. However, there are several disadvantag

  18. Turbine airfoil with outer wall thickness indicators

    Science.gov (United States)

    Marra, John J; James, Allister W; Merrill, Gary B

    2013-08-06

    A turbine airfoil usable in a turbine engine and including a depth indicator for determining outer wall blade thickness. The airfoil may include an outer wall having a plurality of grooves in the outer surface of the outer wall. The grooves may have a depth that represents a desired outer surface and wall thickness of the outer wall. The material forming an outer surface of the outer wall may be removed to be flush with an innermost point in each groove, thereby reducing the wall thickness and increasing efficiency. The plurality of grooves may be positioned in a radially outer region of the airfoil proximate to the tip.

  19. Abdominal wall hernia and pregnancy

    DEFF Research Database (Denmark)

    Jensen, K K; Henriksen, N A; Jorgensen, L N

    2015-01-01

    Med and Embase in combination with a cross-reference search of eligible papers. RESULTS: We included 31 papers of which 23 were case reports. In fertile women undergoing sutured or mesh repair, pain was described in a few patients during the last trimester of a subsequent pregnancy. Emergency surgery of......PURPOSE: There is no consensus as to the treatment strategy for abdominal wall hernias in fertile women. This study was undertaken to review the current literature on treatment of abdominal wall hernias in fertile women before or during pregnancy. METHODS: A literature search was undertaken in Pub...... incarcerated hernias in pregnant women, as well as combined hernia repair and cesarean section appears as safe procedures. No major complications were reported following hernia repair before or during pregnancy. The combined procedure of elective cesarean section and abdominal wall hernia repair was reported...

  20. Shielding walls against ionizing radiation

    International Nuclear Information System (INIS)

    The standard contains specifications for the shape and requirements set for lead bricks such that they can be used to construct radiation-shielding walls according to the building kit system. The dimensions of the bricks are selected in such a way as to permit any modification of the length, height and thickness of said shielding walls in units of 50 mm. The narrow side of the lead bricks juxtaposed to one another in a wall construction to shield against radiation have to form prismatic grooves and tongues; in this way, direct penetration by radiation is prevented. Only cuboid bricks (serial nos. 55-60 according to Table 10) do not have prismatic tongues and grooves. (orig.)

  1. Chest Wall tumor: combined management

    International Nuclear Information System (INIS)

    Cancer is relatively rare disease among children and adolescents. The incidence of solid tumors other than CNS is less than 2/100,000. Tumors of the chest wall can arise either from the somatic tissue or ribs. These are rare, so either institutional reviews or multi institutional studies should determine optimal therapeutic management. Of the bony chest wall, Ewing's sarcoma or the family of tumor (peripheral neuro epithelioma, Askin tumor), are the most common. These lesions are lytic and have associated large extra pleural component. This large extra pleural component often necessitates major chest wall resection (3 or more ribs), and when lower ribs are involved, this entails resection of portion of diaphragm. Despite this resection, survival in the early 1970 was 10-20%. Since 1970 multi agent chemotherapy has increased survival rates. of importance, however, is these regimens have caused significant reduction of these extra pleural components so that major chest wall resections have become a rarity. With improved survival and decreased morbidity preoperative chemotherapy followed by surgery is now the accepted modality of treatment. Another major advantage of this regimen is that potential radiation therapy may be obviated. The most common chest wall lesion is rhabdomyosarcoma. In the IRS study of 1620 RMS patients, in 141 (9%) the primary lesion was in the chest wall. these are primarily alveolar histology. when lesions were superficial, wide local excision with supplemental radiation therapy was associated with low morbidity and good overall survival. however, a majority have significant intra- thoracic components. in these circumstances the resectability rate is less than 30% and the survival poor. Other lesions include non rhabdomyosarcomas, eosinophilic granuloma, chondrosarcoma, and osteomyelitis. The management of these lesions varies according to extent, histology, and patient characteristics

  2. Lymphomas presenting as chest wall tumors

    OpenAIRE

    Witte, Biruta; Hürtgen, Martin

    2006-01-01

    Four cases of thoracic lymphoma mimicking chest wall tumors are presented. As resection is not the treatment of first choice in lymphomas, pretherapeutical evaluation of chest wall tumors should include a thoroughly staging and a biopsy for histopathological diagnosis. Chest wall destruction due to an anterior mediastinal mass, or a chest wall tumor associated with mediastinal lymph node enlargement, could be suspicious of thoracic lymphoma. Lymphoma with chest wall involvement mostly turns o...

  3. Domain wall description of superconductivity

    International Nuclear Information System (INIS)

    In the present work we shall address the issue of electrical conductivity in superconductors in the perspective of superconducting domain wall solutions in the realm of field theory. We take our set up made out of a dynamical complex scalar field coupled to gauge field to be responsible for superconductivity and an extra scalar real field that plays the role of superconducting domain walls. The temperature of the system is interpreted through the fact that the soliton following accelerating orbits is a Rindler observer experiencing a thermal bath

  4. Wave Forces on Crown Walls

    DEFF Research Database (Denmark)

    Pedersen, Jan; Burcharth, H. F.

    1993-01-01

    This paper presents some of the results from a large parametric laboratory study including more than 200 long-duration model tests. The study addresses both the wave forces imposed on the breakwater crown wall as well as the performance of the structure in reducing the wave overtopping. The testing...... programme includes variations of the sea state parameters and of the geometrical configuration of the breakwater and crown wall. Basic relations between forces/overtopping and the varied parameters are examined and preliminary design guidelines for structures within the tested range of variations are...

  5. Glazing and the Trombe wall

    Energy Technology Data Exchange (ETDEWEB)

    Pouder, R W; Leigh, R W

    1978-01-01

    Single, double and triple glazing are examined for use in passive solar Trombe walls and south facing windows. Net gains and losses are calculated employing regional weather data and annual contribution to heating load reduction is evaluated. The study concentrates on the reflectivity of each glass pane, including the dependence of reflectivity on the angle of incidence of the radiation, and resulting heat gains and losses. This facet of passive design heretofore has been inadequately treated as is shown to be significant. The marginal value of each additional pane is investigated with regard to heat gain, energy savings and total costs. Additionally, attention is given to the effects of Trombe wall energy storage.

  6. Shielding walls against ionizing radiation

    International Nuclear Information System (INIS)

    This standard shall be applied to closed shielding facilities which, together with the lead bricks according to DIN 25 407 part 1 and the functional elements according to this standard, are designed to make possible the setting-up of complete shieldings for hot cells in beta-gamma-technique (see DIN 25 407 part 3) according to modular principles. This standard is intended to facilitate the design and construction of hot cells with shielding walls made of lead as well as the interchangeability of individual constructional elements in existing shielding walls. (orig./HP)

  7. Retrofitting Systems for External Walls

    DEFF Research Database (Denmark)

    Rose, Jørgen

    1997-01-01

    In this report, 9 different external and internal retrofitting systems are analyzed using numerical calculations. The analysis focuses on the thermal bridge effects in the different systems, and on this basis it is discussed whether internal or external retrofitting has the most advantages. The...... different systems are evaluated using 5 different types of existing walls....

  8. Solar Walls for concrete renovation

    DEFF Research Database (Denmark)

    Gramkow, Lotte; Vejen, Niels Kristian; Olsen, Lars;

    1996-01-01

    This repport gives a short presentation of three full-scale testing solar walls, the construction including the architectural design, materials and components, transportation and storage of solar enegy, the effect on the construction behind, statics and practical experience.The results of the...... measurments (energy- and temperature conditions, airchange-, termovisions- and moist measurments), operation- and user experience from the three buildings are describet....

  9. Wary Eyes Monitoring Wall Street

    Science.gov (United States)

    Jacobson, Linda

    2008-01-01

    School business officials kept a close watch on the financial markets this week--and on district investment portfolios and teacher-retirement funds--as stock prices gyrated and once-sound institutions got government bailouts or crumbled into bankruptcy. While financial observers said it was too soon to predict how Wall Street's upheaval might…

  10. Partial domain wall partition functions

    CERN Document Server

    Foda, O

    2012-01-01

    We consider six-vertex model configurations on a rectangular lattice with n (N) horizontal (vertical) lines, and "partial domain wall boundary conditions" defined as 1. all 2n arrows on the left and right boundaries point inwards, 2. n_u (n_l) arrows on the upper (lower) boundary, such that n_u + n_l = N - n, also point inwards, 3. all remaining n+N arrows on the upper and lower boundaries point outwards, and 4. all spin configurations on the upper and lower boundaries are summed over. To generate (n-by-N) "partial domain wall configurations", one can start from A. (N-by-N) configurations with domain wall boundary conditions and delete n_u (n_l) upper (lower) horizontal lines, or B. (2n-by-N) configurations that represent the scalar product of an n-magnon Bethe eigenstate and an n-magnon generic state on an N-site spin-1/2 chain, and delete the n lines that represent the Bethe eigenstate. The corresponding "partial domain wall partition function" is computed in construction {A} ({B}) as an N-by-N (n-by-n) det...

  11. Dynamics of domain wall networks

    International Nuclear Information System (INIS)

    Networks or webs of domain walls are admitted in Abelian or non-Abelian gauge theory coupled to fundamental Higgs fields with complex masses. We examine the dynamics of the domain wall loops by using the moduli approximation and find a phase rotation induces a repulsive force which can be understood as a Noether charge of Q-solitons. Non-Abelian gauge theory allows different types of loops which can be deformed to each other by changing a modulus. This admits the moduli geometry like a sandglass made by gluing the tips of the two cigar-(cone-)like metrics of a single triangle loop. We conclude that the sizes of all loops tend to grow for a late time in general models with complex Higgs masses, while the sizes are stabilized at some values once triplet masses are introduced for the Higgs fields. We also show that the stationary motion on the moduli space of the domain wall webs represents 1/4 Bogomol'nyi-Prasad-Sommerfield Q-webs of walls

  12. New Bricks in the Wall

    Institute of Scientific and Technical Information of China (English)

    RONG JIAOJIAO

    2007-01-01

    @@ Whenever a newcomer enters the classroom, he points at the wall. "Look at that!" says Li Shunye, indicating a picture of something that looks a bit like a pink furry fox, only with an oversized tail. "It's a squirrel," says the 9-year-old. "I made it."

  13. PPOOLEX experiments on wall condensation

    Energy Technology Data Exchange (ETDEWEB)

    Laine, J.; Puustinen, M. (Lappeenranta Univ. of Technology, Nuclear Safety Research Unit (Finland))

    2009-08-15

    This report summarizes the results of the wall condensation experiments carried out in December 2008 and January 2009 with the scaled down PPOOLEX test facility designed and constructed at Lappeenranta University of Technology. Steam was blown into the dry well compartment and from there through a DN200 blowdown pipe to the condensation pool. Altogether five experiments, each consisting of several blows, were carried out. The main purpose of the experiment series was to study wall condensation phenomenon inside the dry well compartment while steam is discharged through it into the condensation pool and to produce comparison data for CFD calculations at VTT. The PPOOLEX test facility is a closed stainless steel vessel divided into two compartments, dry well and wet well. For the wall condensation experiments the test facility was equipped with a system for collecting and measuring the amount of condensate from four different wall segments of the dry well compartment. A thermo graphic camera was used in a couple of experiments for filming the outside surface of the dry well wall. The effect of the initial temperature level of the dry well structures and of the steam flow rate for the accumulation of condensate was studied. The initial temperature level of the dry well structures varied from 23 to 99 deg. C. The steam flow rate varied from 90 to 690 g/s and the temperature of incoming steam from 115 to 160 deg. C. During the initial phase of steam discharge the accumulation of condensate was strongly controlled by the temperature level of the dry well structures; the lower the initial temperature level was the more condensate was accumulated. As the dry well structural temperatures increased the condensation process slowed down. Most of the condensate usually accumulated during the first 200 seconds of the discharge. However, the condensation process never completely stopped because a small temperature difference remained between the dry well atmosphere and inner wall

  14. $K \\rightarrow \\pi \\ell^+ \\ell^-$ form factor in the Large-N$_c$ and cut-off regularization method

    CERN Document Server

    Coluccio-Leskow, E; Greynat, D; Nath, A

    2016-01-01

    Bardeen-Buras-G\\'{e}rard have proposed a large N$_c$ method to evaluate hadronic weak matrix elements to attack for instance the determination of the $\\Delta I= \\frac{1}{2}$-rule and Re$(\\frac{\\epsilon'}{\\epsilon})$. Here we test this method to the determination of the form factor parameters in the decay $K^+ \\rightarrow \\pi^+ \\ell^+ \\ell^- $ and $K_S \\rightarrow \\pi ^0 \\ell^+ \\ell^-$. The results are encouraging.

  15. BLADE sequences in transverse T2-weighted MR imaging of the cervical spine. Cut-off for artefacts?

    Energy Technology Data Exchange (ETDEWEB)

    Finkenzeller, T. [Hospital Nuremberg Sued (Germany). Inst. of Radiology and Neuroradiology; Wendl, C.M.; Stroszczynski, C.; Fellner, C. [University Hospital Regensburg (Germany). Inst. of Radiology; Lenhart, S. [Klinikum Weiden (Germany). Radiology and Neuroradiology; Schuierer, G. [Center of Neuroradiology, Regensburg (Germany). Inst. of Neuroradiology

    2015-02-15

    The BLADE (PROPELLER) technique reduces artefacts in imaging of the cervical spine in sagittal orientation, but till now failed to do so in axial orientation, because here it increased through plane CSF-flow artefacts, which spoiled the benefit of BLADE artefact reduction 'in plane'. The aim of this study was to compare a BLADE sequence with optimised measurement parameters in axial orientation to T2-TSE. Both sequences were compared in 58 patients with 31 discal, 16 bony and 11 spinal cord lesions. Image sharpness, reliability of spinal cord depiction, CSF flow artefacts and lesion detection were evaluated by 3 independent observers. Additionally the observers were asked which sequence they would prefer for diagnostic workup. Statistical evaluations were performed using sign and {sub X}2 test. BLADE was significantly superior concerning image sharpness, spinal cord depiction and overall lesion detection. BLADE was rated better for most pathologies, for bony lesions the differences compared with TSE were statistically significant. Regarding CSF-flow artefacts both sequences showed no difference. All readers preferred BLADE in side by side reading. An optimised axial T2 BLADE sequence decreases the problems of increased through plane CSF-flow artefacts in this orientation. By reducing various other artefacts it yields better image quality and has the potential to reduce the number of non-diagnostic examinations especially in uncooperative patients.

  16. Statefinder diagnostic of logarithmic entropy corrected holographic dark energy with Granda-Oliveros IR cut-off

    Science.gov (United States)

    Khodam-Mohammadi, A.; Pasqua, Antonio; Malekjani, M.; Khomenko, Iuliia; Monshizadeh, M.

    2013-06-01

    In this work, we have studied the logarithmic entropy corrected holographic dark energy (LECHDE) model with Granda-Oliveros (G-O) IR cutoff. The evolution of dark energy (DE) density {\\varOmega}'D, the deceleration parameter, q, and equation of state parameter (EoS), ω Λ , are calculated. We show that the phantom divide may be crossed by choosing proper model parameters, even in absence of any interaction between dark energy and dark matter. By studying the statefinder diagnostic and ω_{{\\varLambda}}-ω_{{\\varLambda}}^' analysis, the pair parameters { r, s} and (ω_{{\\varLambda}}-ω_{{\\varLambda}}^') is calculated for flat GO-LECHDE universe. At present time, the pair { r, s} can mimic the ΛCDM scenario for a value of α/ β≃0.87, which is lower than the corresponding one for observational data ( α/ β=1.76) and for Ricci scale ( α/ β=2). We find that at present, by taking the various values of ( α/ β), the different points in r- s and (ω_{{\\varLambda}}-ω_{{\\varLambda}}^') plans are given. Moreover, in the limiting case for a flat dark dominated universe at infinity ( t→∞), we calculate { r, s} at G-O scale. For Ricci scale ( α=2, β=1) we obtain { r=0, s=2/3}.

  17. Statefinder diagnostic of logarithmic entropy corrected holographic dark energy with Granda-Oliveros IR cut-off

    OpenAIRE

    Khodam-Mohammadi, A.; Pasqua, Antonio(Department of Physics, University of Trieste, Via Valerio, No. 2, 34127 Trieste, Italy); Malekjani, M.; Khomenko, Iuliia; Monshizadeh, M.

    2012-01-01

    In this work, we have studied the logarithmic entropy corrected holographic dark energy (LECHDE) model with Granda-Oliveros (G-O) IR cutoff. The evolution of dark energy (DE) density $\\Omega'_D$, the deceleration parameter, $q$, and equation of state parameter (EoS), $\\omega_{\\Lambda}$, are calculated. We show that the phantom divide may be crossed by choosing proper model parameters, even in absence of any interaction between dark energy and dark matter. By studying the statefinder diagnosti...

  18. Statefinder diagnostic of logarithmic entropy corrected holographic dark energy with Granda-Oliveros IR cut-off

    CERN Document Server

    Khodam-Mohammadi, A; Malekjani, M; Khomenko, Iuliia

    2014-01-01

    In this work, we have studied the logarithmic entropy corrected holographic dark energy (LECHDE) model with Granda-Oliveros (G-O) IR cutoff. The evolution of dark energy (DE) density $\\Omega'_D$, the deceleration parameter, $q$, and equation of state parameter (EoS), $\\omega_{\\Lambda}$, are calculated. We show that the phantom divide may be crossed by choosing proper model parameters, even in absence of any interaction between dark energy and dark matter. By studying the statefinder diagnostic and $\\omega_{\\Lambda}-\\omega_{\\Lambda}^{\\prime}$ analysis, the pair parameters $\\{r,s\\}$ and $(\\omega_{\\Lambda}-\\omega_{\\Lambda}^{\\prime})$ is calculated for flat GO-LECHDE universe. At present time, the pair $\\{r,s\\}$ can mimic the $\\Lambda$CDM scenario for a value of $\\alpha/\\beta\\simeq 0.87$, which is lower than the corresponding one for observational data ($\\alpha/\\beta=1.76$) and for Ricci scale ($\\alpha/\\beta=2$). We find that at present, by taking the various values of ($\\alpha/\\beta$), the different points in $r...

  19. cMET in NSCLC: Can We Cut off the Head of the Hydra? From the Pathway to the Resistance

    Directory of Open Access Journals (Sweden)

    Nele Van Der Steen

    2015-03-01

    Full Text Available In the last decade, the tyrosine kinase receptor cMET, together with its ligand hepatocyte growth factor (HGF, has become a target in non-small cell lung cancer (NSCLC. Signalization via cMET stimulates several oncological processes amongst which are cell motility, invasion and metastasis. It also confers resistance against several currently used targeted therapies, e.g., epidermal growth factor receptor (EGFR inhibitors. In this review, we will discuss the basic structure of cMET and the most important signaling pathways. We will also look into aberrations in the signaling and the effects thereof in cancer growth, with the focus on NSCLC. Finally, we will discuss the role of cMET as resistance mechanism.

  20. BLADE sequences in transverse T2-weighted MR imaging of the cervical spine. Cut-off for artefacts?

    International Nuclear Information System (INIS)

    The BLADE (PROPELLER) technique reduces artefacts in imaging of the cervical spine in sagittal orientation, but till now failed to do so in axial orientation, because here it increased through plane CSF-flow artefacts, which spoiled the benefit of BLADE artefact reduction 'in plane'. The aim of this study was to compare a BLADE sequence with optimised measurement parameters in axial orientation to T2-TSE. Both sequences were compared in 58 patients with 31 discal, 16 bony and 11 spinal cord lesions. Image sharpness, reliability of spinal cord depiction, CSF flow artefacts and lesion detection were evaluated by 3 independent observers. Additionally the observers were asked which sequence they would prefer for diagnostic workup. Statistical evaluations were performed using sign and X2 test. BLADE was significantly superior concerning image sharpness, spinal cord depiction and overall lesion detection. BLADE was rated better for most pathologies, for bony lesions the differences compared with TSE were statistically significant. Regarding CSF-flow artefacts both sequences showed no difference. All readers preferred BLADE in side by side reading. An optimised axial T2 BLADE sequence decreases the problems of increased through plane CSF-flow artefacts in this orientation. By reducing various other artefacts it yields better image quality and has the potential to reduce the number of non-diagnostic examinations especially in uncooperative patients.

  1. cMET in NSCLC: Can We Cut off the Head of the Hydra? From the Pathway to the Resistance

    Energy Technology Data Exchange (ETDEWEB)

    Van Der Steen, Nele [Center for Oncological Research Antwerp, University of Antwerp, Universiteitsplein 1, Wilrijk 2610 (Belgium); Pauwels, Patrick [Center for Oncological Research Antwerp, University of Antwerp, Universiteitsplein 1, Wilrijk 2610 (Belgium); Molecular Pathology Unit, Pathology Department, Antwerp University Hospital, Wilrijkstraat 10, Edegem 2650 (Belgium); Gil-Bazo, Ignacio [Department of Oncology, Clínica Universidad de Navarra, Pamplona 31008 (Spain); Castañon, Eduardo [Department of Oncology, Clínica Universidad de Navarra, Pamplona 31008 (Spain); Phase I-Early Clinical Trials Unit, Oncology Department, Antwerp University Hospital, Wilrijkstraat 10, Edegem 2650 (Belgium); Raez, Luis [Thoracic Oncology Program, Memorial Cancer Institute, Memorial Health Care System, Pembroke Pines, FL 33024 (United States); Cappuzzo, Federico [4Thoracic Oncology Program, Memorial Cancer Institute, Memorial Health Care System, Pembroke Pines, FL 33024 (United States); Rolfo, Christian, E-mail: Christian.Rolfo@uza.be [Center for Oncological Research Antwerp, University of Antwerp, Universiteitsplein 1, Wilrijk 2610 (Belgium); Phase I-Early Clinical Trials Unit, Oncology Department, Antwerp University Hospital, Wilrijkstraat 10, Edegem 2650 (Belgium)

    2015-03-25

    In the last decade, the tyrosine kinase receptor cMET, together with its ligand hepatocyte growth factor (HGF), has become a target in non-small cell lung cancer (NSCLC). Signalization via cMET stimulates several oncological processes amongst which are cell motility, invasion and metastasis. It also confers resistance against several currently used targeted therapies, e.g., epidermal growth factor receptor (EGFR) inhibitors. In this review, we will discuss the basic structure of cMET and the most important signaling pathways. We will also look into aberrations in the signaling and the effects thereof in cancer growth, with the focus on NSCLC. Finally, we will discuss the role of cMET as resistance mechanism.

  2. Twisted mass, overlap and Creutz fermions: Cut-off effects at tree-level of perturbation theory

    International Nuclear Information System (INIS)

    We study cutoff effects at tree-level of perturbation theory for maximally twisted mass Wilson, overlap and the recently proposed Creutz fermions. We demonstrate that all three kinds of lattice fermions exhibit the expected O(a2) scaling behaviour in the lattice spacing. In addition, the sizes of these cutoff effects are comparable for the three kinds of lattice fermions considered here. Furthermore, we analyze situations when twisted mass fermions are not exactly at maximal twist and when overlap fermions are studied in comparison to twisted mass fermions when the quark masses are not matched

  3. Design of Metamaterial Based High Pass Filter Using CSRR at Cut Off Frequency 0.9 Ghz

    OpenAIRE

    Ashish Duvey1 , Shandeep Sharma and Gulshan Sharma2

    2012-01-01

    filters are implemented in microstrip technology by etching complementary split ring resonators (CSRRs), in the ground plane, and series capacitive gaps, or interdigital capacitors, in the signal strip. The structure exhibits a composite right/left handed (CRLH) behavior and, by properly tuning the geometry of the elements, a high pass response with a sharp transition band is obtained.

  4. Design of Metamaterial Based High Pass Filter Using CSRR at Cut Off Frequency 0.9 Ghz

    Directory of Open Access Journals (Sweden)

    Ashish Duvey1 , Shandeep Sharma and Gulshan Sharma2

    2012-12-01

    Full Text Available filters are implemented in microstrip technology by etching complementary split ring resonators (CSRRs, in the ground plane, and series capacitive gaps, or interdigital capacitors, in the signal strip. The structure exhibits a composite right/left handed (CRLH behavior and, by properly tuning the geometry of the elements, a high pass response with a sharp transition band is obtained.

  5. Design of Metamaterial Based High Pass Filter Using CSRR at Cut Off Frequency 0.9 Ghz

    OpenAIRE

    Gulshan Sharma; Shandeep Sharma; Ashish Duvey

    2012-01-01

    In this work, highly selective filters based on periodic arrays of electrically small resonators are pointed out. The highpass filters are implemented in microstrip technology by etching complementary split ring resonators (CSRRs), in the ground plane, and series capacitive gaps, or interdigital capacitors, in the signal strip. The structure exhibits a composite right/left handed (CRLH) behavior and, by properly tuning the geometry of the elements, a high pass response with a sharp transition...

  6. Adaptive determination of cut-off frequencies for filtering the in-cylinder pressure in Diesel engines combustion analysis

    OpenAIRE

    Payri González, Francisco; Olmeda González, Pablo Cesar; Guardiola García, Carlos; Martín Díaz, Jaime

    2011-01-01

    Abstract In-cylinder pressure analysis is a key tool for engine research and diagnosis and it has been object of study from the beginning of the internal combustion engines. One of its most useful application is combustion analysis on the basis of the First Law of Thermodynamics. However, heat release law calculations use the in-cylinder pressure derivative signal. Hence, the noise is increased and pressure filtering becomes necessary to remove high frequency noise, thus allowing f...

  7. Absolute depth of myometrial invasion in endometrial cancer is superior to the currently used cut-off value of 50%

    NARCIS (Netherlands)

    Geels, Y.P.; Pijnenborg, J.M.A.; Berg-van Erp, S.H. van den; Snijders, M.P.; Bulten, J.; Massuger, L.F.A.G.

    2013-01-01

    OBJECTIVE: In endometrial carcinoma, myometrial invasion is a well known predictor of recurrence, and important in the decision making for adjuvant treatment. According to the FIGO staging system, myometrial invasion is expressed as invasion of <50%> of the myometrium (50%MI). It has been sugg

  8. Passive tailoring of laser-accelerated ion beam cut-off energy by using double foil assembly

    International Nuclear Information System (INIS)

    A double foil assembly is shown to be effective in tailoring the maximum energy produced by a laser-accelerated proton beam. The measurements compare favorably with adiabatic expansion simulations, and particle-in-cell simulations. The arrangement proposed here offers for some applications a simple and passive way to utilize simultaneously highest irradiance lasers that have best laser-to-ion conversion efficiency while avoiding the production of undesired high-energy ions

  9. Cut-off effects of Wilson type fermions on the QCD equation of state to O(g2)

    International Nuclear Information System (INIS)

    We compute the O(g2) contribution to the thermodynamic pressure for Wilson fermions in the standard, the twisted mass and clover improved formulation in lattice perturbation theory. Clover and maximally twisted fermions offer O(a)-improvement and thus are qualitatively comparable to standard staggered fermions. We compare the continuum approaches of these discretisations for the case of massive quarks along a line of constant physics and discuss their scaling behaviour

  10. cMET in NSCLC: Can We Cut off the Head of the Hydra? From the Pathway to the Resistance

    International Nuclear Information System (INIS)

    In the last decade, the tyrosine kinase receptor cMET, together with its ligand hepatocyte growth factor (HGF), has become a target in non-small cell lung cancer (NSCLC). Signalization via cMET stimulates several oncological processes amongst which are cell motility, invasion and metastasis. It also confers resistance against several currently used targeted therapies, e.g., epidermal growth factor receptor (EGFR) inhibitors. In this review, we will discuss the basic structure of cMET and the most important signaling pathways. We will also look into aberrations in the signaling and the effects thereof in cancer growth, with the focus on NSCLC. Finally, we will discuss the role of cMET as resistance mechanism

  11. Antimicrobial susceptibility testing of Clostridium difficile using EUCAST epidemiological cut-off values and disk diffusion correlates

    DEFF Research Database (Denmark)

    Erikstrup, L T; Hall, Vanessa Jane; Kahlmeter, G;

    2012-01-01

    Clin Microbiol Infect ABSTRACT: With the emergence of reduced susceptibility of Clostridium difficile to metronidazole and vancomycin the value of antimicrobial susceptibility testing has increased. The aim of our study was to evaluate disk diffusion for susceptibility testing of C. difficile by ...

  12. Measuring the demand for nature-based tourism in Africa: a choice experiment using the "cut-off" approach

    OpenAIRE

    Bush, Glenn; Colombo, Sergio; Hanley, Nicholas

    2008-01-01

    Integrated Conservation and Development Plans (ICDPs) have been put forward as means of reconciling wildlife conservation in developing countries with improvements in community incomes. In this paper, we use the Choice Experiment approach to quantify overseas tourists' willingness to pay for attributes of nature-based tourism as part of an ICDP, focussing on visits to mountain gorilla areas in Rwanda. Contributions to community incomes are included as one attribute of the design. Methodologic...

  13. Managing proliferation risks from civilian and weapon-grade plutonium and enriched uranium: A comprehensive cut-off convention

    International Nuclear Information System (INIS)

    The problem of weapon-grade fissile materials is closely related to the aim of achieving a nuclear-weapon-free world. Huge amounts of highly enriched uranium have been produced for nuclear weapons. More than 1000 tonnes of plutonium emerged as a by-product of civilian nuclear industry. Separated from spent fuel it is readily usable for nuclear weapons. The worldwide civilian tritium inventory may reach the same size as military stocks about the year 2010. This poses an increasing danger of horizontal nuclear proliferation. Production, stockpiling, trade, processing and uses of weapon-grade materials like Highly enriched uranium, plutonium and tritium promote its geographical spread, enlarge the group of people with the relate know-how and create the danger of diversion of material and the proliferation of knowledge for the purpose of weapons production. Therefore, a fundamental turn away from using weapon-grade materials in scientific and economic applications of nuclear energy is desirable in all countries. Priority should be given to using nuclear fuel cycles which are as proliferation resistant as possible. Without this, the continuation of civil nuclear programs seems to be irresponsible and unjustifiable. The role of the IAEA in export control safeguards related to the above problems is indispensable

  14. The impact of gestational diabetes mellitus on pregnancy outcome comparing different cut-off criteria for abnormal glucose tolerance.

    OpenAIRE

    Anderberg, Eva; Källén, Karin; Berntorp, Kerstin

    2010-01-01

    Abstract Objective. To examine pregnancy outcomes in relation to different categories of glucose tolerance during pregnancy. Design. Prospective observational cohort study. Setting. Patient recruitment and data collection were performed in four delivery departments in southern Sweden. Population. Women delivering during 2003-2005; 306 with gestational diabetes mellitus, 744 with gestational impaired glucose tolerance and 329 randomly selected controls. Methods. All women were offered a 75 g o...

  15. Ethnic specific obesity cut-offs for diabetes risk: cross-sectional study of 490, 288 UK Biobank participants

    OpenAIRE

    Ntuk, Uduakobong; Gill, Jason MR; MacKay, Daniel; Sattar, Naveed; Pell, Jill

    2014-01-01

    OBJECTIVE To compare the relationship between adiposity and prevalent diabetes across ethnic groups in the UK Biobank cohort and to derive ethnic-specific obesity cutoffs that equate to those developed in white populations in terms of diabetes prevalence. RESEARCH DESIGN AND METHODS UK Biobank recruited 502,682 U.K. residents aged 40–69 years. We used baseline data on the 490,288 participants from the four largest ethnic subgroups: 471,174 (96.1%) white, 9,631 (2.0%) South Asian, 7,949 (1...

  16. 40 CFR 53.53 - Test for flow rate accuracy, regulation, measurement accuracy, and cut-off.

    Science.gov (United States)

    2010-07-01

    ... the sampler such that the sampler flow rate can be manually restricted during the test. (f) Procedure... 40 Protection of Environment 5 2010-07-01 2010-07-01 false Test for flow rate accuracy, regulation... Class II Equivalent Methods for PM2.5 or PM10â2.5 § 53.53 Test for flow rate accuracy,...

  17. Prevalence and cut-off point of vitamin D deficiency among secondary students of Arak, Iran in 2010

    OpenAIRE

    Afsaneh Talaei; Nasrin Yadegari; Mohamad Rafee; Rezvanfar, Mohamad R.; Abdolatif Moini

    2012-01-01

    Introduction: Vitamin D has a basic role in bone growth and metabolism and has been noticed for its important role in many diseases, such as diabetes, depression, hypertension, and cardiovascular disease. Regarding some studies, detection of vitamin D deficiency in different places has important implication for health. This study determined prevalence of vitamin D deficiency in Arak, a centrally located city in Iran. Materials and Methods: Based upon a cross-sectional study in 2010, 420 stude...

  18. Cut off values for abdominal obesity as a criterion of metabolic syndrome in an ethnic Kyrgyz population (Central Asian region

    Directory of Open Access Journals (Sweden)

    Mirrakhimov Aibek E

    2012-02-01

    Full Text Available Abstract Background People of different racial and ethnic backgrounds have a distinct pattern of central fat deposition, thus making it necessary to devise a race based approach for the diagnosis and evaluation of abdominal obesity (AO. This is the first study to determine the optimal waist circumference (WC cutoff values for definition of AO in an ethnic Kyrgyz population. Methods 323 persons of Kyrgyz ethnicity (183 women and 140 men, with a mean age of 51.8 ± 9.5 years old were included in the study. Measurement of blood pressure (BP, anthropometric data (including body mass index calculation and WC measurement, fasting blood sugar, serum lipid parameters and insulin were performed in all examined individuals. Insulin resistance (IR was considered as HOMA index (insulin × fasting glucose/22.5 ≥ 2.77. Sensitivity and specificity for the presence of IR or two other criteria of MS (according to the international classification, 2009 were calculated by using receiver operating characteristic (ROC curves for men and women separately. Results The optimal sensitivity and specificity obtained from the ROC curves for IR were 88 cm in women (sensitivity of 0.85, 95%CI (0.72-0.93, specificity of 0.58, 95%CI (0.49-0.66 and 94 cm for men (sensitivity of 0.8, 95% CI (0.65-0.91, specificity of 0.61, 95% CI (0.51-0.71. The data from the ROC curve for any two other MS criteria confirmed the results and the WC 88 cm in women (sensitivity of 0.82, 95% CI (0.72-0.9, specificity of 0.72, 95% CI (0.62-0.8 and 94 cm in men (sensitivity of 0.74, 95% CI (0.62-0.84, specificity of 0.73, 95% CI (0.61-0.83 were corresponded to the optimal sensitivity and specificity. Conclusion WC ≥ 88 cm and ≥ 94 cm should be used as a criterion for the diagnosis of AO for Kyrgyz women and men respectively based on these results.

  19. Cut off values for abdominal obesity as a criterion of metabolic syndrome in an ethnic Kyrgyz population (Central Asian region)

    OpenAIRE

    Mirrakhimov Aibek E; Lunegova Olga S; Kerimkulova Alina S; Moldokeeva Cholpon B; Nabiev Malik P; Mirrakhimov Erkin M

    2012-01-01

    Abstract Background People of different racial and ethnic backgrounds have a distinct pattern of central fat deposition, thus making it necessary to devise a race based approach for the diagnosis and evaluation of abdominal obesity (AO). This is the first study to determine the optimal waist circumference (WC) cutoff values for definition of AO in an ethnic Kyrgyz population. Methods 323 persons of Kyrgyz ethnicity (183 women and 140 men), with a mean age of 51.8 ± 9.5 years old were included...

  20. Steel-framed buildings: Impacts of wall detail configurations on the whole wall thermal performance

    Energy Technology Data Exchange (ETDEWEB)

    Kosny, J.; Desjarlais, A.O.; Christian, J.E.

    1998-06-01

    The main objective of this paper is the influence of architectural wall details on the whole wall thermal performance. Whole wall thermal performance analysis was performed for six light gage steel-framed wall systems (some with wood components). For each wall system, all wall details were simulated using calibrated 3-D finite difference computer modeling. The thermal performance of the six steel-framed wall systems included various system details and the whole wall system thermal performance for a typical single-story ranch house. Currently, predicted heat losses through building walls are typically based on measurements of the wall system clear wall area using test methods such as ASTM C 236 or are calculated by one of the procedures recommended in the ASHRAE Handbook of Fundamentals that often is carried out for the clear wall area exclusively. In this paper, clear wall area is defined as the part of the wall system that is free of thermal anomalies due to building envelope details or thermally unaffected by intersections with other surfaces of the building envelope. Clear wall experiments or calculations normally do not include the effects of building envelope details such as corners, window and door openings, and structural intersections with roofs, floors, ceilings, and other walls. In steel-framed wall systems, these details typically consist of much more structural components than the clear wall. For this situation, the thermal properties measured or calculated for the clear wall area do not adequately represent the total wall system thermal performance. Factors that would impact the ability of today`s standard practice to accurately predict the total wall system thermal performance are the accuracy of the calculation methods, the area of the total wall that is clear wall, and the quantity and thermal performance of the various wall system details.

  1. Through-the-wall radar imaging

    CERN Document Server

    Amin, Moeness G

    2011-01-01

    Wall Attenuation and Dispersion, A. Hussein Muqaibel, M.A. Alsunaidi, Nuruddeen M. Iya, and A. Safaai-JaziAntenna Elements, Arrays, and Systems for Through-the-Wall Radar Imaging, A. Hoorfar and A. FathyBeamforming for Through-the-Wall Radar Imaging, G. Alli and D. DiFilippoImage and Localization of Behind-the-Wall Targets Using Collocated and Distributed Apertures, Y.D. Zhang and A. HuntConventional and Emerging Waveforms for Detection and Imaging of Targets behind Walls, F. Ahmad and R.M. NarayananInverse Scattering Approaches in Through-the-Wall Imaging, K. Sarabandi, M. Thiel, M. Dehmollai

  2. Sonographic Findings of Variable Chest Wall Disorders

    Energy Technology Data Exchange (ETDEWEB)

    Shim, Mi Suk; Kim, Ji Young; Cho, Woo Ho; Kim, Joung Sook; Jeong, Myeong Ja; Kim, Soung Hee; Kim, Jae Hyung; Kim, Soo Hyun; Jun, Woo Sun [Sanggye Paik Hospital, Inje University College of Medicine, Seoul (Korea, Republic of)

    2008-06-15

    Variable chest wall disorders include hemorrhage, inflammation and a tumor on the chest wall. Especially in females, abnormal anterior chest wall findings can appear as breast lesions due to the anatomic relationship between the chest wall and the breast. Sonography is the first diagnostic tool to utilize for chest wall disorders and has an important role for the differential diagnosis. In this study, we introduce sonographic findings of the various chest wall disorders that are discovered incidentally during an examination for a palpable mass or pain in the breast. We also describe sonographic findings that additionally performed of sonography-guided core needle biopsy

  3. WALL-E. Humanamente tecnológicos

    OpenAIRE

    Madrid Brito, Débora

    2014-01-01

    [ES] El cine de animación ha planteado en numerosas ocasiones los conflictos que ha generado la relación entre el hombre y el desarrollo tecnológico y científico. En el caso de Wall-E se aprecia un llamativo cambio de roles entre humanos y robots. La película propone, a través de las relaciones de sus personajes y su argumento, una reflexión en torno a la necesidad de la técnica para la evolución humana. Este artículo, a partir de la descripción e interpretación de algunos elementos clave de ...

  4. Wall conditioning of JET with the ITER-Like Wall

    Science.gov (United States)

    Douai, D.; Brezinsek, S.; Esser, H. G.; Joffrin, E.; Keenan, T.; Knipe, S.; Kogut, D.; Lomas, P. J.; Marsen, S.; Nunes, I.; Philipps, V.; Pitts, R. A.; Shimada, M.; de Vries, P.; JET EFDA Contributors

    2013-07-01

    The initial conditioning cycle of JET ILW is analysed and compared with restart and operation in 2008 with a carbon dominated wall. Comparable water and oxygen decay times are observed during bake-out in both cases. Despite a 2 × 10-3 mbar l/s leak rate during plasma operation, no further wall conditioning has been necessary after plasma restart in ILW, which dramatically contrasts with 2008. Plasma O content is lower with the ILW. Higher O levels are measured after nights or week-ends, BeO layers being formed and re-eroded, but do not impact plasma operation and performance. First results on isotopic wall changeover by GDC on the ILW six months of the first D2 campaign evidence a reservoir of about 3 × 1022 atoms, i.e. ten time lower than in carbon PFCs. A study in JET of the glow discharge current distribution for different ratios of the ionization mean free paths to the vessel dimensions seems to indicate sufficient toroidal and poloidal homogeneity in ITER.

  5. Brick walls on the brane

    International Nuclear Information System (INIS)

    The so-called 'brick-wall model' is a semiclassical approach that has been used to explain black hole entropy in terms of thermal matter fields. Here, we apply the brick-wall formalism to thermal bulk fields in a Randall-Sundrum brane world scenario. In this case, the black hole entity is really a string-like object in the anti-de Sitter bulk, while appearing as a Schwarzchild black hole to observers living on the brane. In spite of these exotic circumstances, we establish that the Bekenstein-Hawking entropy law is preserved. Although a similar calculation was recently considered in the literature, this prior study invoked a simplifying assumption (which we avoid) that cannot be adequately justified

  6. Domain walls at finite temperature

    International Nuclear Information System (INIS)

    It is suggested that the phase transition of lambda phi 4 theory as a function of temperature coincides with the spontaneous appearance of domain walls. Based on one-loop calculations, T sub(c) = 4M/√ lambda is estimated as the temperature for these domains to because energetically favored, to be compared with T sub(c) = 4.9M/√ lambda from effective potential calculations (which are performed directly in the broken phase). Domain walls, as well as other Types of fluctuations, disorder the system above T sub(c), leading to =0. The critical exponent for the specific heat above T sub(c) is computed; and α=2/3 + 0 (√ lambda) is obtained. (Author)

  7. Actinomycosis involving the chest wall: CT findings

    International Nuclear Information System (INIS)

    Two cases of pulmonary actinomycosis with extension to involve the chest wall that were evaluated using computerized tomography are reported. In both cases, the relation of pulmonary and chest wall disease was best shown using CT

  8. Thermal insulation properties of walls

    OpenAIRE

    Zhukov Aleksey Dmitrievich; Bessonov Igor' Vyacheslavovich; Sapelin Andrey Nikolaevich; Bobrova Ekaterina Yur'evna

    2014-01-01

    Heat-protective qualities of building structures are determined by the qualities of the used materials, adequate design solutions and construction and installation work of high quality. This rule refers both to the structures made of materials similar in their structure and nature and mixed, combined by a construction system. The necessity to ecaluate thermal conductivity is important for a product and for a construction. Methods for evaluating the thermal protection of walls are based on the...

  9. Thermal insulation properties of walls

    Directory of Open Access Journals (Sweden)

    Zhukov Aleksey Dmitrievich

    2014-05-01

    Full Text Available Heat-protective qualities of building structures are determined by the qualities of the used materials, adequate design solutions and construction and installation work of high quality. This rule refers both to the structures made of materials similar in their structure and nature and mixed, combined by a construction system. The necessity to ecaluate thermal conductivity is important for a product and for a construction. Methods for evaluating the thermal protection of walls are based on the methods of calculation, on full-scale tests in a laboratory or on objects. At the same time there is a reason to believe that even deep and detailed calculation may cause deviation of the values from real data. Using finite difference method can improve accuracy of the results, but it doesn’t solve all problems. The article discusses new approaches to evaluating thermal insulation properties of walls. The authors propose technique of accurate measurement of thermal insulation properties in single blocks and fragments of walls and structures.

  10. Reactor wall for thermonuclear device

    International Nuclear Information System (INIS)

    Walls of structures in a thermonuclear reactor undergo irradiation and thermal loads and particle loads by high energy particles from plasmas to cause abrasion in the reactor walls or radiation loss of plasmas. In view of the above, the reactor walls of the present invention are constituted by making the plane of lamination of 2-dimensionally woven carbon fiber composite materials in perpendicular to the heat receiving surface of armors or metallurgically joining the carbon fiber composite materials and heat sink members so as to intersect the plane of the lamination. Since the lamination surface of the armor made of 2-dimensionally woven carbon fiber composite material is in parallel with the macro view stream of heat in the armors, there is no greater temperature difference between adjacent laminations. In addition, since the heat conductivity is high in the direction in parallel with the lamination phase of the carbon fiber composite material, the temperature increase at the face of the armor is reduced with identical amount of input heat to reduce the abrasion by sublimation. Further, since they are metallurgically joined with heat sink members, no large residual stresses remain after the joining. (K.M.)

  11. Flooding Effect on Earth Walls

    Directory of Open Access Journals (Sweden)

    Meysam Banimahd

    2010-12-01

    Full Text Available Earth building is a sustainable, environmentally friendly and economical method of construction that has been used worldwide for many centuries. For the past three decades, earth has seen a revival as a building material for a modern construction method due to its benefits in terms of low carbon content, low cost and energy involved during construction, as well as the fact that it is a sustainable technology of building. Climate change is influencing precipitation levels and patterns around the world, and as a consequence, flood risk is increasing rapidly. When flooding occurs, earth buildings are exposed to water by submersion, causing an increase in the degree of saturation of the earth structures and therefore a decrease of the suction between particles. This study investigated the effect of cycles of flooding (consecutive events of flooding followed by dry periods on earth walls. A series of characterization tests were carried out to obtain the physical and mechanical properties of the studied earth material. In a second stage, Flooding Simulation Tests (FST were performed to explore the earth walls’ response to repeated flooding events. The results obtained for the tested earth wall/samples with reinforced material (straw reveal hydraulic hysteresis when wall/samples are subject to cycles of wetting and drying.

  12. Domain Walls Zoo in Supersymmetric QCD

    CERN Document Server

    Smilga, A V

    1998-01-01

    Solving numerically the equations of motion for the effective lagrangian describing supersymmetric QCD with the SU(2) gauge group, we find a menagerie of complex domain wall solutions connecting different chirally asymmetric vacua. Some of these solutions are BPS saturated walls; they exist when the mass of the matter fields does not exceed some critical value m m*, the complex walls disappear altogether and only the walls connecting a chirally asymmetric vacuum with the chirally symmetric one survive.

  13. Accelerating forward genetics for cell wall deconstruction

    OpenAIRE

    Vidaurre, Danielle; Bonetta, Dario

    2012-01-01

    The elucidation of the genes involved in cell wall synthesis and assembly remains one of the biggest challenges of cell wall biology. Although traditional genetic approaches, using simple yet elegant screens, have identified components of the cell wall, many unknowns remain. Exhausting the genetic toolbox by performing sensitized screens, adopting chemical genetics or combining these with improved cell wall imaging, hold the promise of new gene discovery and function. With the recent introduc...

  14. Cell Wall Integrity Signaling in Saccharomyces cerevisiae

    OpenAIRE

    Levin, David E.

    2005-01-01

    The yeast cell wall is a highly dynamic structure that is responsible for protecting the cell from rapid changes in external osmotic potential. The wall is also critical for cell expansion during growth and morphogenesis. This review discusses recent advances in understanding the various signal transduction pathways that allow cells to monitor the state of the cell wall and respond to environmental challenges to this structure. The cell wall integrity signaling pathway controlled by the small...

  15. How do plant cell walls extend?

    Science.gov (United States)

    Cosgrove, D. J.

    1993-01-01

    This article briefly summarizes recent work that identifies the biophysical and biochemical processes that give rise to the extension of plant cell walls. I begin with the biophysical notion of stress relaxation of the wall and follow with recent studies of wall enzymes thought to catalyze wall extension and relaxation. Readers should refer to detailed reviews for more comprehensive discussion of earlier literature (Taiz, 1984; Carpita and Gibeaut, 1993; Cosgrove, 1993).

  16. Moss cell walls: structure and biosynthesis

    OpenAIRE

    Alison W. Roberts; Eric M Roberts; Haigler, Candace H.

    2012-01-01

    The genome sequence of the moss Physcomitrella patens has stimulated new research examining the cell wall polysaccharides of mosses and the glycosyl transferases that synthesize them as a means to understand fundamental processes of cell wall biosynthesis and plant cell wall evolution. The cell walls of mosses and vascular plants are composed of the same classes of polysaccharides, but with differences in side chain composition and structure. Similarly, the genomes of P. patens and angiosperm...

  17. Correlations of coronary plaque wall thickness with wall pressure and wall pressure gradient: a representative case study

    Directory of Open Access Journals (Sweden)

    Liu Biyue

    2012-07-01

    Full Text Available Abstract Background There are two major hemodynamic stresses imposed at the blood arterial wall interface by flowing blood: the wall shear stress (WSS acting tangentially to the wall, and the wall pressure (WP acting normally to the wall. The role of flow wall shear stress in atherosclerosis progression has been under intensive investigation, while the impact of blood pressure on plaque progression has been under-studied. Method The correlations of wall thickness (WT with wall pressure (WP, blood pressure on the lumen wall and spatial wall pressure gradient (WPG in a human atherosclerotic right coronary artery were studied. The pulsatile blood flow was simulated using a three dimensional mathematical model. The blood was treated as an incompressible viscous non-Newtonian fluid. The geometry of the artery was re-constructed using an in vivo intravascular ultrasound (IVUS 44-slice dataset obtained from a patient with consent obtained. The WT, the WP and the WPG were averaged on each slice, respectively, and Pearson correlation analysis was performed on slice averaged base. Each slice was then divided into 8 segments and averaged vessel WT, WP and WPG were collected from all 352 segments for correlation analysis. Each slice was also divided into 2 segments (inner semi-wall of bend and outer semi-wall of bend and the correlation analysis was performed on the 88 segments. Results Under mean pressure, the Pearson coefficient for correlation between WT and WP was r = − 0.52 (p  Conclusions Results from this representative case report indicated that plaque wall thickness correlated negatively with wall pressure (r = −0.81 by slice and positively with wall pressure gradient (r = 0.45. The slice averaged WT has a strong linear relationship with the slice averaged WP. Large-scale patient studies are needed to further confirm our findings.

  18. To detect anomalies in diaphragm walls

    NARCIS (Netherlands)

    Spruit, R.

    2015-01-01

    Diaphragm walls are potentially ideal retaining walls for deep excavations in densely built-up areas, as they cause no vibrations during their construction and provide structural elements with high strength and stiffness. In the recent past, however, several projects using diaphragm walls as soil an

  19. Behind-the-wall target identification (BWTI)

    Science.gov (United States)

    Yoon, Yeo-Sun; Amin, Moeness G.

    2009-05-01

    Through-the-wall radar imaging is of value in several civilian and defense applications. One of the challenges in through-the-wall radar imaging is the strong wall reflections which tend to persist over a long duration of time. In order to image weak and close by targets behind walls, the wall reflections should be suppressed, or at least be significantly alleviated. In this paper, we apply spatial filters across the antenna array to remove the spatial zero-frequency and low-frequency components which correspond to wall reflections. The application of spatial filters recognizes the fact that the wall EM responses do not significantly differ when viewed by the different antennas along the axis of a real or synthesized array aperture which is parallel to the wall. The proposed approach is tested with experimental data using solid wall, multi-layered wall, and cinder block wall. It is shown that the wall reflections can be effectively reduced by spatial preprocessing prior to beamforming, producing similar imaging results to those achieved when a background scene without the target is available.

  20. Casimir force for cosmological domain walls

    OpenAIRE

    Matsuda, Tomohiro

    2011-01-01

    We calculate the vacuum fluctuations that may affect the evolution of cosmological domain walls. Considering domain walls, which are classically stable and have interaction with a scalar field, we show that explicit symmetry violation in the interaction may cause quantum bias that can solve the cosmological domain wall problem.

  1. Steel Sheet Pile Walls in Soft Soil

    NARCIS (Netherlands)

    Kort, D.A.

    2002-01-01

    For almost a century, steel sheet pile walls are applied worldwide as earth retaining structures for excavations and quay walls. Within the framework of the development of European structural codes for Civil Engineering works, the Eurocodes, Eurocode 3 Part 5 for design of steel sheet pile walls was

  2. Domain walls. II. Baryon-number generation

    International Nuclear Information System (INIS)

    Domain walls present in the early universe due to a spontaneous breakdown of charge conjugation can leave behind net baryon number. SU/sub R/(2) instantons provide baryon nonconservation and the proton is effectively stable. Density perturbations (on scales large enough for galaxy formation) and monopole suppression can occur if walls dominate the energy density. Mechanisms for wall removal are discussed

  3. The cell wall of Fusarium oxysporum

    NARCIS (Netherlands)

    Schoffelmeer, EAM; Klis, FM; Sietsma, JH; Cornelissen, BJC

    1999-01-01

    Sugar analysis of isolated cell walls from three formae speciales of Fusarium oxysporum showed that they contained not only glucose and (N-acetyl)-glucosamine, but also mannose, galactose, and uronic acids, presumably originating from cell wall glycoproteins. Cell wall glycoproteins accounted for 50

  4. Unique aspects of the grass cell wall

    Science.gov (United States)

    Grasses are amongst the most important crops worldwide, and the composition of their cell walls is critical for uses as food, feed, and energy crops. Grass cell walls differ dramatically from dicot cell walls in terms of the major structural polysaccharides present, how those polysaccharides are lin...

  5. POROUS WALL, HOLLOW GLASS MICROSPHERES

    Energy Technology Data Exchange (ETDEWEB)

    Sexton, W.

    2012-06-30

    Hollow Glass Microspheres (HGM) is not a new technology. All one has to do is go to the internet and Google{trademark} HGM. Anyone can buy HGM and they have a wide variety of uses. HGM are usually between 1 to 100 microns in diameter, although their size can range from 100 nanometers to 5 millimeters in diameter. HGM are used as lightweight filler in composite materials such as syntactic foam and lightweight concrete. In 1968 a patent was issued to W. Beck of the 3M{trademark} Company for 'Glass Bubbles Prepared by Reheating Solid Glass Particles'. In 1983 P. Howell was issued a patent for 'Glass Bubbles of Increased Collapse Strength' and in 1988 H. Marshall was issued a patent for 'Glass Microbubbles'. Now Google{trademark}, Porous Wall, Hollow Glass Microspheres (PW-HGMs), the key words here are Porous Wall. Almost every article has its beginning with the research done at the Savannah River National Laboratory (SRNL). The Savannah River Site (SRS) where SRNL is located has a long and successful history of working with hydrogen and its isotopes for national security, energy, waste management and environmental remediation applications. This includes more than 30 years of experience developing, processing, and implementing special ceramics, including glasses for a variety of Department of Energy (DOE) missions. In the case of glasses, SRS and SRNL have been involved in both the science and engineering of vitreous or glass based systems. As a part of this glass experience and expertise, SRNL has developed a number of niches in the glass arena, one of which is the development of porous glass systems for a variety of applications. These porous glass systems include sol gel glasses, which include both xerogels and aerogels, as well as phase separated glass compositions, that can be subsequently treated to produce another unique type of porosity within the glass forms. The porous glasses can increase the surface area compared to &apos

  6. Mechanism of bubble detachment from vibrating walls

    International Nuclear Information System (INIS)

    We discovered a previously unobserved mechanism by which air bubbles detach from vibrating walls in glasses containing water. Chaotic oscillation and subsequent water jets appeared when a wall vibrated at greater than a critical level. Wave forms were developed at water-air interface of the bubble by the wall vibration, and water jets were formed when sufficiently grown wave-curvatures were collapsing. Droplets were pinched off from the tip of jets and fell to the surface of the glass. When the solid-air interface at the bubble-wall attachment point was completely covered with water, the bubble detached from the wall. The water jets were mainly generated by subharmonic waves and were generated most vigorously when the wall vibrated at the volume resonant frequency of the bubble. Bubbles of specific size can be removed by adjusting the frequency of the wall's vibration

  7. Practical considerations in ultrasonic wall thickness measurement

    International Nuclear Information System (INIS)

    Ultrasonic inspection is widely used by industry for the detection of corrosion and the measurement of material wall thickness. Due to wall thinning and the various forms of corrosion that can be found in pressure piping and pressure vessels the annual cost of corrosion damage and related service failures, is very expensive. The author interest is primarily in the examination of personnel who need to become competent and certificated in the various skills that are required to carry out wall thickness measurement and detection of wall thinning due to corrosion. The various techniques and equipment available for ultrasonic wall thickness measurement and assessment give rise to problems regarding the accuracy of results and detection of corrosion. This paper will discuss some of the corrosion conditions that may occur and also problems that may arise during wall thickness measurement. Methods of improving the wall thickness measurement and the assessment process will also be discussed. (author)

  8. Surgery of chest wall deformities

    OpenAIRE

    Matos, AC; Bernardo, JE; Fernandes, LE; Antunes, MJ

    1997-01-01

    OBJECTIVE: To evaluate the medium-term results of 77 surgical corrections in patients with chest wall deformities, 53 (68.8%) with pectus excavatum and 24 with pectus carinatum, operated upon from 1985 to 1994. METHODS: The mean age of the patients was 14.7 years (4-39 years) and 77% were younger than 15 years of age. There were 59 male (76.7%) and 18 female patients. Only four had a family history of the malformation. Seven patients (9.1%) presented with asthma-like symptoms, and 13 (16....

  9. Green Walls for Clean Air

    OpenAIRE

    Gölsdorf, Katrin; Müller, Hans; Collier, Marcus

    2013-01-01

    Can plants help to improve the air quality? People have often complained about Ivy on buildings, but research by Helix Pflanzen GmbH, a company that is specialised in the cultivation of ivy species and the development of green wall technology, is shedding new light on an old problem. Using a cultivated variety of ivy (Hedera helix 'Wörner'), experiments were carried out that illustrated the binding effect that this Ivy has on fine dust particles. This is particularly important in urban ...

  10. Methodology for first wall design

    International Nuclear Information System (INIS)

    An analytic parametric scoping tool has been developed for application to first wall (FW) design problems. Both thermal and disruption force effects are considered. For the high heat flux and high disruption load conditions expected in the International Thermonuclear Experimental Reactor (ITER) device, Vanadium alloy and dispersion-strengthened copper offer the best stress margins using a somewhat flattened plasma-facing configuration. Ferritic steels also appear to have an acceptable stress margin, whereas the conventional stainless steel 316 does not appear feasible. If a full semicircle shape FW is required, only the Vanadium and ferritic steel alloy have acceptable solutions

  11. First Wall and Operational Diagnostics

    Energy Technology Data Exchange (ETDEWEB)

    Lasnier, C; Allen, S; Boedo, J; Groth, M; Brooks, N; McLean, A; LaBombard, B; Sharpe, J; Skinner, C; Whyte, D; Rudakov, D; West, W; Wong, C

    2006-06-19

    In this chapter we review numerous diagnostics capable of measurements at or near the first wall, many of which contribute information useful for safe operation of a tokamak. There are sections discussing infrared cameras, visible and VUV cameras, pressure gauges and RGAs, Langmuir probes, thermocouples, and erosion and deposition measurements by insertable probes and quartz microbalance. Also discussed are dust measurements by electrostatic detectors, laser scattering, visible and IR cameras, and manual collection of samples after machine opening. In each case the diagnostic is discussed with a view toward application to a burning plasma machine such as ITER.

  12. Reflections on a flat wall

    International Nuclear Information System (INIS)

    This paper describes an investigation into whether estimates of attenuation in the flat sidewalls of the tunnel for the MC main ring can be based on a simple point-source/line-of-sight model. Having seen the limitations of such a model, an alternative is proposed where the main radiation source is not the initial object struck by the beam but the plane source provided by the first interactions of secondaries from the target in the shield-wall. This is shown to have a closer relation to reality than the point-source/line-of-sight model. (author)

  13. An improved resistive wall monitor

    International Nuclear Information System (INIS)

    Resistive wall monitors were designed and built for the Fermilab Main Injector project. These devices measure longitudinal beam current from 3 KHz to 4 GHz with a 1 ohm gap impedance. The new design provides a larger aperture and a calibration port to improve the accuracy of single-bunch intensity measurements. Microwave absorber material is used to reduce interference from spurious electromagnetic waves traveling inside the beam pipe. Several types of ferrite materials were evaluated for the absorber. Inexpensive ferrite rods were selected and assembled in an array forming the desired geometry without machining. copyright 1998 American Institute of Physics

  14. An improved resistive wall monitor

    International Nuclear Information System (INIS)

    Resistive wall monitors were designed and built for the Fermilab Main Injector project. These devices measure longitudinal beam current from 3 KHz to 4 GHz with a 1 ohm gap impedance. The new design provides a larger aperture and a calibration port to improve the accuracy of single-bunch intensity measurements. Microwave absorber material is used to reduce interference from spurious electromagnetic waves traveling inside the beam pipe. Several types of ferrite materials were evaluated for the absorber. Inexpensive ferrite rods were selected and assembled in an array forming the desired geometry without machining

  15. New Massive Gravity Domain Walls

    CERN Document Server

    dS, U Camara

    2010-01-01

    The properties of the asymptotic $AdS_3$ space-times representing flat domain walls (DW's) solutions of the New Massive 3D Gravity with scalar matter are studied. Our analysis is based on $I^{st}$ order BPS-like equations involving an appropriate superpotential. The Brown-York boundary stress-tensor is used for the calculation of DW's tensions as well as of the $CFT_2$'s central charges. The holographic renormalization group flows and the phase transitions in specific deformed $CFT_2$ dual to 3D massive gravity model with quadratic superpotential are discussed.

  16. Anterior chest wall examination reviewed

    Directory of Open Access Journals (Sweden)

    F. Trotta

    2011-09-01

    Full Text Available Anterior chest wall involvement is not infrequently observed within inflammatory arthropaties, particularly if one considers seronegative spondiloarthritides and SAPHO syndrome. Physical examination is unreliable and conventional X-rays analysis is an unsatisfactory tool during diagnostic work-up of this region. Scintigraphic techniques yield informations both on the activity and on the anatomical extent of the disease while computerized tomography visualize the elementary lesions, such as erosions, which characterize the process. Moreover, when available, magnetic resonance imaging couple the ability to finely visualize such lesions with the possibility to show early alterations and to characterize the “activity” of the disease, presenting itself as a powerful tool both for diagnosis and follow-up. This review briefly shows the applications of imaging techniques for the evaluation of the anterior chest wall focusing on what has been done in the SAPHO syndrome which can be considered prototypical for this regional involvement since it is the osteo-articular target mainly affected by the disease.

  17. Retaining walls on subsidence areas

    International Nuclear Information System (INIS)

    The best results in treating structures subjected to mining-induced subsidence are achieved when the problem is divided into two parts. First, the mining engineer determines the magnitude of ground movements due to mining and transfers to the designer of the structure the value of expected subsidence and its components, such as surface curvature, tilt, and strain, both tensile and compressive. Second, the structural engineer, knowing the magnitudes of subsidence components, subgrade properties, such as soil capacity, specific weight, angle of internal friction, and deformation modulus, in addition to the characteristics and service requirements of the designed structure, is able to apply proper solutions to mitigate subsidence influence or to design the structure so that damage is minimized and serviceability is unobstructed by subsidence, both for existing and newly designed structures. In this paper, are derived formulas for calculating the horizontal soil pressure acting on freestanding retaining walls and basement walls of structures erected on mine subsidence areas. Different work conditions resulting in different values of soil pressure in non-mined and mine subsidence areas are analyzed. An example of a structure designed using the derived formulas is also given

  18. RG Domain Walls and Hybrid Triangulations

    CERN Document Server

    Dimofte, Tudor; van der Veen, Roland

    2013-01-01

    This paper studies the interplay between the N=2 gauge theories in three and four dimensions that have a geometric description in terms of twisted compactification of the six-dimensional (2,0) SCFT. Our main goal is to construct the three-dimensional domain walls associated to any three-dimensional cobordism. We find that we can build a variety of 3d theories that represent the local degrees of freedom at a given domain wall in various 4d duality frames, including both UV S-dual frames and IR Seiberg-Witten electric-magnetic dual frames. We pay special attention to Janus domain walls, defined by four-dimensional Lagrangians with position-dependent couplings. If the couplings on either side of the wall are weak in different UV duality frames, Janus domain walls reduce to S-duality walls, i.e. domain walls that encode the properties of UV dualities. If the couplings on one side are weak in the IR and on the other weak in the UV, Janus domain walls reduce to RG walls, i.e. domain walls that encode the properties...

  19. Electrons in ferromagnets with domain walls

    International Nuclear Information System (INIS)

    Domain walls can significantly modify electronic properties of ferromagnetic metals. In this paper we consider theoretically the influence of domain walls on transport properties of ferromagnetic materials and the results are compared with recent experiments. In the case of diffusive transport through a thick domain wall, the semiclassical approximation is applied and a local spin transformation is performed, which replaces the system with a domain wall by the corresponding system without a domain wall but with an additional gauge field. Due to a redistribution of single-particle electron states at the wall, one obtains then either negative or positive contributions to resistivity. The situation is different for very narrow and/or constrained domain walls. In such a case, the semiclassical approximation is not valid. Instead of this the approach based on scattering matrix is applied. The domain wall then gives rise to a large positive contribution to electrical resistivity. The corresponding magnetoresistance can be therefore very large, which is in agreement with recent experiments. The limiting case of narrow domain walls in systems with a single conduction channel is analysed in detail, with the effects due to electron-electron interaction taken into account. In this particular case the magnetoresistance due to a domain wall can be extremely large

  20. Estimates of elastic fracture mechanics parameters for thick walled pipes with slanted axial through wall cracks

    International Nuclear Information System (INIS)

    The present paper provides the elastic stress intensity factors (SIFs) and the crack opening displacements (CODs) of a thick walled pipe with a slanted axial through wall crack. For estimating these elastic fracture mechanics parameters, systematic three dimensional elastic finite element (FE) analyses were performed by considering geometric variables, i. e., thickness of pipe, reference crack length, and crack length ratio, affecting the SIFs and CODs. As for loading condition, the internal pressure was considered. Based on the FE results, the SIFs and CODs of slanted axial through wall cracks in a thick-walled pipe along the crack front and the wall thickness were calculated. In particular, to calculate the SIFs of a thick walled pipe with a slanted axial through wall crack from those of a thick walled pipe with an idealized axial through wall crack, a slant correction factor representing the effect of the slant crack on the SIFs was proposed

  1. Architecture of dermatophyte cell Walls: Electron microscopic and biochemical analysis

    Science.gov (United States)

    Nozawa, Y.; Kitajima, Y.

    1984-01-01

    A review with 83 references on the cell wall structure of dermatophytes is presented. Topics discussed include separation and preparation of cell walls; microstructure of cell walls by electron microscopy; chemical composition of cell walls; structural model of cell walls; and morphological structure of cell walls.

  2. Shape dynamics of growing cell walls

    CERN Document Server

    Banerjee, Shiladitya; Dinner, Aaron R

    2015-01-01

    We introduce a general theoretical framework to study the shape dynamics of actively growing and remodeling surfaces. Using this framework we develop a physical model for growing bacterial cell walls and study the interplay of cell shape with the dynamics of growth and constriction. The model allows us to derive constraints on cell wall mechanical energy based on the observed dynamics of cell shape. We predict that exponential growth in cell size requires a constant amount of cell wall energy to be dissipated per unit volume. We use the model to understand and contrast growth in bacteria with different shapes such as spherical, ellipsoidal, cylindrical and toroidal morphologies. Coupling growth to cell wall constriction, we predict a discontinuous shape transformation, from partial constriction to cell division, as a function of the chemical potential driving cell-wall synthesis. Our model for cell wall energy and shape dynamics relates growth kinetics with cell geometry, and provides a unified framework to d...

  3. Hydrodynamics of ultra-relativistic bubble walls

    Directory of Open Access Journals (Sweden)

    Leonardo Leitao

    2016-04-01

    Full Text Available In cosmological first-order phase transitions, gravitational waves are generated by the collisions of bubble walls and by the bulk motions caused in the fluid. A sizeable signal may result from fast-moving walls. In this work we study the hydrodynamics associated to the fastest propagation modes, namely, ultra-relativistic detonations and runaway solutions. We compute the energy injected by the phase transition into the fluid and the energy which accumulates in the bubble walls. We provide analytic approximations and fits as functions of the net force acting on the wall, which can be readily evaluated for specific models. We also study the back-reaction of hydrodynamics on the wall motion, and we discuss the extrapolation of the friction force away from the ultra-relativistic limit. We use these results to estimate the gravitational wave signal from detonations and runaway walls.

  4. ADULT ABDOMINAL WALL HERNIA IN IBADAN

    OpenAIRE

    Ayandipo, O.O; Afuwape, O.O.; Irabor, D. O.; Abdurrazzaaq, A.I.

    2015-01-01

    Background: Abdominal wall hernias are very common diseases encountered in surgical practice. Groin hernia is the commonest type of abdominal wall hernias. There are several methods of hernia repair but tension-free repair (usually with mesh) offers the least recurrent rate. Aim: To describe the clinical profile of anterior abdominal wall hernias and our experience in the surgical management of identified hernias Method: The project was a retrospective study of all patients with abdominal wal...

  5. Electron-wall Interaction in Hall Thrusters

    Energy Technology Data Exchange (ETDEWEB)

    Y. Raitses; D. Staack; M. Keidar; N.J. Fisch

    2005-02-11

    Electron-wall interaction effects in Hall thrusters are studied through measurements of the plasma response to variations of the thruster channel width and the discharge voltage. The discharge voltage threshold is shown to separate two thruster regimes. Below this threshold, the electron energy gain is constant in the acceleration region and therefore, secondary electron emission (SEE) from the channel walls is insufficient to enhance electron energy losses at the channel walls. Above this voltage threshold, the maximum electron temperature saturates.

  6. Automotion of Domain Walls for Spintronic Interconnects

    OpenAIRE

    Nikonov, Dmitri E.; Manipatruni, Sasikanth; Young, Ian A.

    2013-01-01

    We simulate automotion, the spontaneous transport of a magnetic domain wall under the influence of demagnetization and magnetic anisotropy, in nanoscale spintronic interconnects. In contrast to spin transfer driven magnetic domain wall motion, the proposed interconnects operate with only a transient current pulse and provide favorable scaling down to the 20nm scale. Cases of both in-plane and perpendicular magnetization are considered. Analytical dependence of the velocity of domain walls on ...

  7. Ultrasonic wall thickness measurement without coupling liquid

    International Nuclear Information System (INIS)

    If the material measured is part of the ultrasonic transducer, then one can do without the usual coupling liquid for ultrasonic measurement of wall thickness. Measuring equipment works on the basis of this electro-dynamic ultrasonic transducer, which has been developed to check the wall thickness (3 to 30 mm) of steel pipes with outside diameters of 25 to 180 mm. Double errors and local changes of wall thickness can be detected. (orig.)

  8. Tourism Development: Issues for Historic Walled Towns

    OpenAIRE

    Tomi Brezovec; David Bruce

    2009-01-01

    This paper discusses issues in tourism development and visitor management in historic walled towns. Historic towns and walled towns in particular, attract tourists that enjoy the preserved medieval ambience, architecture and picturesque streets. Tourism has an impact on economic and social life as well as on the urban and natural environment. Walled towns and cities with their obvious barriers exemplify and crystallise issues, challenges, and opportunities critical to the development of touri...

  9. Motional Effect on Wall Shear Stresses

    DEFF Research Database (Denmark)

    Kock, Samuel Alberg; Torben Fründ, Ernst; Yong Kim, Won

    Atherosclerosis is the leading cause of death and severe disability. Wall Shear Stress (WSS), the stress exerted on vessel walls by the flowing blood is a key factor in the development of atherosclerosis. Computational Fluid Dynamics (CFD) is widely used for WSS estimations. Most CFD simulations...... are based on static models to ease computational burden leading to inaccurate estimations. The aim of this work was to estimate the effect of vessel wall deformations (expansion and bending) on WSS levels....

  10. Charm physics with Moebius Domain Wall Fermions

    CERN Document Server

    Jüttner, Andreas; Tsang, Justus Tobias; Boyle, Peter; Marinkovic, Marina; Hashimoto, Shoji; Kaneko, Takashi; Cho, Yong-Gwi

    2015-01-01

    We present results showing that Domain Wall fermions are a suitable discretisation for the simulation of heavy quarks. This is done by a continuum scaling study of charm quarks in a M\\"obius Domain Wall formalism using a quenched set-up. We find that discretisation effects remain well controlled by the choice of Domain Wall parameters preparing the ground work for the ongoing dynamical $2+1f$ charm program of RBC/UKQCD.

  11. A Wall of Funnels Concentrates Swimming Bacteria▿

    OpenAIRE

    Galajda, Peter; Keymer, Juan; Chaikin, Paul; Austin, Robert

    2007-01-01

    Randomly moving but self-propelled agents, such as Escherichia coli bacteria, are expected to fill a volume homogeneously. However, we show that when a population of bacteria is exposed to a microfabricated wall of funnel-shaped openings, the random motion of bacteria through the openings is rectified by tracking (trapping) of the swimming bacteria along the funnel wall. This leads to a buildup of the concentration of swimming cells on the narrow opening side of the funnel wall but no concent...

  12. Vapor wall deposition in Teflon chambers

    OpenAIRE

    Zhang, X; R. H. Schwantes; R. C. McVay; H Lignell; M. M. Coggon; Flagan, R C; Seinfeld, J.H.

    2014-01-01

    Teflon chambers are ubiquitous in studies of atmospheric chemistry. Secondary organic aerosol (SOA) formation can be substantially underestimated owing to deposition of SOA-forming compounds to chamber walls. We present here an experimental protocol to constrain the nature of wall deposition of organic vapors in Teflon chambers. We measured the wall deposition rates of 25 oxidized organic compounds generated from the photooxidation of isoprene, toluene, α-pinene, and dodecan...

  13. Shape dynamics of growing cell walls

    OpenAIRE

    Banerjee, Shiladitya; Scherer, Norbert F.; Dinner, Aaron R.

    2015-01-01

    We introduce a general theoretical framework to study the shape dynamics of actively growing and remodeling surfaces. Using this framework we develop a physical model for growing bacterial cell walls and study the interplay of cell shape with the dynamics of growth and constriction. The model allows us to derive constraints on cell wall mechanical energy based on the observed dynamics of cell shape. We predict that exponential growth in cell size requires a constant amount of cell wall energy...

  14. Thoracic Wall Reconstruction after Tumor Resection

    OpenAIRE

    HARATI, KAMRAN; Kolbenschlag, Jonas; Behr, Björn; Goertz, Ole; Hirsch, Tobias; Kapalschinski, Nicolai; Ring, Andrej; Lehnhardt, Marcus; Daigeler, Adrien

    2015-01-01

    Introduction Surgical treatment of malignant thoracic wall tumors represents a formidable challenge. In particular, locally advanced tumors that have already infiltrated critical anatomic structures are associated with a high surgical morbidity and can result in full-thickness defects of the thoracic wall. Plastic surgery can reduce this surgical morbidity by reconstructing the thoracic wall through various tissue transfer techniques. Sufficient soft-tissue reconstruction of the thoracic w...

  15. Wall-crossing made smooth

    CERN Document Server

    Pioline, Boris

    2015-01-01

    In $D=4,N=2$ theories on $R^{3,1}$, the index receives contributions not only from single-particle BPS states, counted by the BPS indices, but also from multi-particle states made of BPS constituents. In a recent work [arXiv:1406.2360], a general formula expressing the index in terms of the BPS indices was proposed, which is smooth across walls of marginal stability and reproduces the expected single-particle contributions. In this note, I analyze the two-particle contributions predicted by this formula, and show agreement with the spectral asymmetry of the continuum of scattering states in the supersymmetric quantum mechanics of two non-relativistic, mutually non-local dyons. This provides a physical justification for the error function profile used in the mathematics literature on indefinite theta series, and in the physics literature on black hole partition functions.

  16. Neutron Wall at RIBLL Ⅱ

    Institute of Scientific and Technical Information of China (English)

    XuHuagen; XuHushan; LiWenfei; ZhanWenlong; XiaoGuoqing; GuoZhongyan; SunZhiyu; LiChen; ChenRuofu; MaYue; ZhangXueying[; JiaFei

    2003-01-01

    With the construction of the new Radioactive Ion Beam Line in Lanzhou (RIBLL Ⅱ) which connecting the CSRm and the CSRe, an experimental setup.The Time-of-Flight (ToF) technique was recognized as one of the best ways for neutron detection and it, is employed by the neutrons wall. Considering the high neutron multiplicity, the detector shouldal so have the ability to resolve the multiple hits. Moreover, a high detection efficiency for the neutrons with energies ranging from 100MeV to 1 GeV is also required besides the high granularity. In this case, the sampling hadronic calorimeter type of detector has been selected. In order to estimate the performance of the detector and

  17. Virtual gap dielectric wall accelerator

    Energy Technology Data Exchange (ETDEWEB)

    Caporaso, George James; Chen, Yu-Jiuan; Nelson, Scott; Sullivan, Jim; Hawkins, Steven A

    2013-11-05

    A virtual, moving accelerating gap is formed along an insulating tube in a dielectric wall accelerator (DWA) by locally controlling the conductivity of the tube. Localized voltage concentration is thus achieved by sequential activation of a variable resistive tube or stalk down the axis of an inductive voltage adder, producing a "virtual" traveling wave along the tube. The tube conductivity can be controlled at a desired location, which can be moved at a desired rate, by light illumination, or by photoconductive switches, or by other means. As a result, an impressed voltage along the tube appears predominantly over a local region, the virtual gap. By making the length of the tube large in comparison to the virtual gap length, the effective gain of the accelerator can be made very large.

  18. BPS Spectra, Barcodes and Walls

    CERN Document Server

    Cirafici, Michele

    2015-01-01

    BPS spectra give important insights into the non-perturbative regimes of supersymmetric theories. Often from the study of BPS states one can infer properties of the geometrical or algebraic structures underlying such theories. In this paper we approach this problem from the perspective of persistent homology. Persistent homology is at the base of topological data analysis, which aims at extracting topological features out of a set of points. We use these techniques to investigate the topological properties which characterize the spectra of several supersymmetric models in field and string theory. We discuss how such features change upon crossing walls of marginal stability in a few examples. Then we look at the topological properties of the distributions of BPS invariants in string compactifications on compact threefolds, used to engineer black hole microstates. Finally we discuss the interplay between persistent homology and modularity by considering certain number theoretical functions used to count dyons i...

  19. Determination of arterial wall shear stress

    Institute of Scientific and Technical Information of China (English)

    2001-01-01

    The arteries can remodel their structure and function to adapt themselves to the mechanical environment. In various factors that lead to vascular remodeling, the shear stress on the arterial wall induced by the blood flow is of great importance. However, there are many technique difficulties in measuring the wall shear stress directly at present. In this paper, through analyzing the pulsatile blood flow in arteries, a method has been proposed that can determine the wall shear stress quantitatively by measuring the velocity on the arterial axis, and that provides a necessary means to discuss the influence of arterial wall shear stress on vascular remodeling.

  20. Fillability of Thin-Wall Steel Castings

    Energy Technology Data Exchange (ETDEWEB)

    Robert C. Voigt; Joseph Bertoletti; Andrew Kaley; Sandi Ricotta; Travis Sunday

    2002-07-30

    The use of steel components is being challenged by lighter nonferrous or cast iron components. The development of techniques for enhancing and ensuring the filability of thin-wall mold cavities is most critical for thinner wall cast steel production. The purpose of this research was to develop thin-wall casting techniques that can be used to reliably produce thin-wall castings from traditional gravity poured sand casting processes. The focus of the research was to enhance the filling behavior to prevent misrunds. Experiments were conducted to investigate the influence of various foundry variables on the filling of thin section steel castings. These variables include casting design, heat transfer, gating design, and metal fluidity. Wall thickness and pouring temperature have the greatest effect on casting fill. As wall thickness increases the volume to surface area of the casting increases, which increases the solidification time, allowing the metal to flow further in thicker sect ions. Pouring time is another significant variable affecting casting fill. Increases or decreases of 20% in the pouring time were found to have a significant effect on the filling of thin-wall production castings. Gating variables, including venting, pouring head height, and mold tilting also significantly affected thin-wall casting fill. Filters offer less turbulent, steadier flow, which is appropriate for thicker castings, but they do not enhance thin-wall casting fill.

  1. Domain wall resistance in epitaxial Fe wires

    Energy Technology Data Exchange (ETDEWEB)

    Hassel, C., E-mail: christoph.hassel@uni-due.d [Fachbereich Physik and Center for Nanointegration Duisburg-Essen (CeNIDE), Universitaet Duisburg-Essen, 47048 Duisburg (Germany); Roemer, F.M.; Reckers, N. [Fachbereich Physik and Center for Nanointegration Duisburg-Essen (CeNIDE), Universitaet Duisburg-Essen, 47048 Duisburg (Germany); Kronast, F. [Bessy GmbH, Berlin (Germany); Dumpich, G.; Lindner, J. [Fachbereich Physik and Center for Nanointegration Duisburg-Essen (CeNIDE), Universitaet Duisburg-Essen, 47048 Duisburg (Germany)

    2011-04-15

    We studied the magnetoresistance behavior of epitaxial Fe wires grown on GaAs(1 1 0) with varying widths at room temperature. Single nanowires show a wire width (w) dependence of the coercive field, which increases with 1/w for decreasing wire widths. This enables the pinning of a single domain wall in the connection area of two wires with different widths. Magnetoresistance measurements of such wire structures clearly reveal resistance contributions arising from a domain wall. The presence of the domain wall is proven by photoemission electron-microscopy with synchrotron radiation. Moreover, micromagnetic simulations are performed to determine the spin orientations, especially within the domain wall. This permits us to calculate the anisotropic magnetoresistance caused by the domain wall. Taking this into account, we determine the intrinsic domain wall resistance, for which we found a positive value of 0.2%, in agreement with theoretical predictions. - Research highlights: > Magnetoresistance of epitaxial Fe wires is studied. > Pinning of a single domain wall at constriction. > Detection of domain wall by resistance and XPEEM measurements. > AMR contribution calculated by micromagnetic simulations. > Positive intrinsic domain wall resistance in agreement with theory.

  2. Domain wall resistance in epitaxial Fe wires

    International Nuclear Information System (INIS)

    We studied the magnetoresistance behavior of epitaxial Fe wires grown on GaAs(1 1 0) with varying widths at room temperature. Single nanowires show a wire width (w) dependence of the coercive field, which increases with 1/w for decreasing wire widths. This enables the pinning of a single domain wall in the connection area of two wires with different widths. Magnetoresistance measurements of such wire structures clearly reveal resistance contributions arising from a domain wall. The presence of the domain wall is proven by photoemission electron-microscopy with synchrotron radiation. Moreover, micromagnetic simulations are performed to determine the spin orientations, especially within the domain wall. This permits us to calculate the anisotropic magnetoresistance caused by the domain wall. Taking this into account, we determine the intrinsic domain wall resistance, for which we found a positive value of 0.2%, in agreement with theoretical predictions. - Research highlights: → Magnetoresistance of epitaxial Fe wires is studied. → Pinning of a single domain wall at constriction. → Detection of domain wall by resistance and XPEEM measurements. → AMR contribution calculated by micromagnetic simulations. → Positive intrinsic domain wall resistance in agreement with theory.

  3. Glycoprotein component of plant cell walls

    International Nuclear Information System (INIS)

    The primary wall surrounding most dicotyledonous plant cells contains a hydroxyproline-rich glycoprotein (HRGP) component named extensin. A small group of glycopeptides solubilized from isolated cell walls by proteolysis contained a repeated pentapeptide glycosylated by tri- and tetraarabinosides linked to hydroxyproline and, by galactose, linked to serine. Recently, two complementary approaches to this problem have provided results which greatly increase the understanding of wall extensin. In this paper the authors describe what is known about the structure of soluble extensin secreted into the walls of the carrot root cells

  4. Microanalysis of Plant Cell Wall Polysaccharides

    Institute of Scientific and Technical Information of China (English)

    Nicolai Obel; Veronika Erben; Tatjana Schwarz; Stefan Kühne; Andrea Fodor; Markus Pauly

    2009-01-01

    Oligosaccharide Mass Profiling (OLIMP) allows a fast and sensitive assessment of cell wall polymer structure when coupled with Matrix Assisted Laser Desorption Ionisation Time Of Flight Mass Spectrometry (MALDI-TOF MS). The short time required for sample preparation and analysis makes possible the study of a wide range of plant organs, revealing a high degree of heterogeneity in the substitution pattern of wall polymers such as the cross-linking glycan xyloglucan and the pectic polysaccharide homogalacturonan. The high sensitivity of MALDI-TOF allows the use of small amounts of samples, thus making it possible to investigate the wall structure of single cell types when material is collected by such methods as laser micro-dissection. As an example, the analysis of the xyloglucan structure in the leaf cell types outer epidermis layer, entire epidermis cell layer, palisade mesophyll cells, and vascular bundles were investigated. OLIMP is amenable to in situ wall analysis, where wall polymers are analyzed on unprepared plant tissue itself without first iso-lating cell walls. In addition, OLIMP enables analysis of wall polymers in Golgi-enriched fractions, the location of nascent matrix polysaccharide biosynthesis, enabling separation of the processes of wall biosynthesis versus post-deposition apo-plastic metabolism. These new tools will make possible a semi-quantitative analysis of the cell wall at an unprecedented level.

  5. ON WALL SHEAR STRESS OF ARTERY

    Institute of Scientific and Technical Information of China (English)

    Liu Zhao-rong; Liu Bao-yu; Qin Kai-rong

    2003-01-01

    In this paper, a method was proposed that the wall shear stress of artery could be determined by measuring the centerline axial velocity and radial motion of arterial wall simultaneously.The method is simple in application and can get higher precision when it is used to determine the shear stress of arterial wall in vivo.As an example, the shear stress distribution in periodic oscillatory flow of human carotid was calculated and discussed.The computed results show that the shear stress distribution at any given instant is almost uniform and will be zero at the centerline and tends to maximum at the vessel wall.

  6. Molecular regulation of plant cell wall extensibility

    Science.gov (United States)

    Cosgrove, D. J.

    1998-01-01

    Gravity responses in plants often involve spatial and temporal changes in cell growth, which is regulated primarily by controlling the ability of the cell wall to extend. The wall is thought to be a cellulose-hemicellulose network embedded in a hydrated matrix of complex polysaccharides and a small amount of structural protein. The wall extends by a form of polymer creep, which is mediated by expansins, a novel group of wall-loosening proteins. Expansins were discovered during a molecular dissection of the "acid growth" behavior of cell walls. Expansin alters the rheology of plant walls in profound ways, yet its molecular mechanism of action is still uncertain. It lacks detectable hydrolytic activity against the major components of the wall, but it is able to disrupt noncovalent adhesion between wall polysaccharides. The discovery of a second family of expansins (beta-expansins) sheds light on the biological role of a major group of pollen allergens and implies that expansins have evolved for diverse developmental functions. Finally, the contribution of other processes to wall extensibility is briefly summarized.

  7. Skyrmions from Instantons inside Domain Walls

    CERN Document Server

    Eto, M; Ohashi, K; Tong, D; Eto, Minoru; Nitta, Muneto; Ohashi, Keisuke; Tong, David

    2005-01-01

    Some years ago, Atiyah and Manton described a method to construct approximate Skyrmion solutions from Yang-Mills instantons. Here we present a dynamical realization of this construction using domain walls in a five-dimensional gauge theory. The non-abelian gauge symmetry is broken in each vacuum but restored in the core of the domain wall, allowing instantons to nestle inside the wall. We show that the worldvolume dynamics of the wall is given by the Skyrme model, including the four-derivative term, and the instantons appear as Skyrmions.

  8. Corrections to the thin wall approximation in general relativity

    Science.gov (United States)

    Garfinkle, David; Gregory, Ruth

    1989-01-01

    The question is considered whether the thin wall formalism of Israel applies to the gravitating domain walls of a lambda phi(exp 4) theory. The coupled Einstein-scalar equations that describe the thick gravitating wall are expanded in powers of the thickness of the wall. The solutions of the zeroth order equations reproduce the results of the usual Israel thin wall approximation for domain walls. The solutions of the first order equations provide corrections to the expressions for the stress-energy of the wall and to the Israel thin wall equations. The modified thin wall equations are then used to treat the motion of spherical and planar domain walls.

  9. External Insulation of Masonry Walls and Wood Framed Walls

    Energy Technology Data Exchange (ETDEWEB)

    Baker, P.

    2013-01-01

    The use of exterior insulation on a building is an accepted and effective means to increase the overall thermal resistance of the assembly that also has other advantages of improved water management and often increased air tightness of building assemblies. For thin layers of insulation (1" to 1 1/2"), the cladding can typically be attached directly through the insulation back to the structure. For thicker insulation layers, furring strips have been added as a cladding attachment location. This approach has been used in the past on numerous Building America test homes and communities (both new and retrofit applications), and has been proven to be an effective and durable means to provide cladding attachment. However, the lack of engineering data has been a problem for many designers, contractors, and code officials. This research project developed baseline engineering analysis to support the installation of thick layers of exterior insulation on existing masonry and frame walls. Furthermore, water management details necessary to integrate windows, doors, decks, balconies and roofs were created to provide guidance on the integration of exterior insulation strategies with other enclosure elements.

  10. External Insulation of Masonry Walls and Wood Framed Walls

    Energy Technology Data Exchange (ETDEWEB)

    Baker, P. [Building Science Corporation, Somerville, MA (United States)

    2013-01-01

    The use of exterior insulation on a building is an accepted and effective means to increase the overall thermal resistance of the assembly that also has other advantages of improved water management and often increased air tightness of building assemblies. For thin layers of insulation (1” to 1 ½”), the cladding can typically be attached directly through the insulation back to the structure. For thicker insulation layers, furring strips have been added as a cladding attachment location. This approach has been used in the past on numerous Building America test homes and communities (both new and retrofit applications), and has been proven to be an effective and durable means to provide cladding attachment. However, the lack of engineering data has been a problem for many designers, contractors, and code officials. This research project developed baseline engineering analysis to support the installation of thick layers of exterior insulation on existing masonry and frame walls. Furthermore, water management details necessary to integrate windows, doors, decks, balconies and roofs were created to provide guidance on the integration of exterior insulation strategies with other enclosure elements.

  11. Wall-Laws for High Speed Flows over Adiabatic and Isothermal Walls

    OpenAIRE

    Mohammadi, Bijan; Puigt, Guillaume

    2000-01-01

    We present the extension of our wall-laws developed for low-speed flows to super and hypersonic configurations. In particular, we are interested in flows over isothermal walls and account for heat transfer. We recall the main steps of the development: - Obtention of generalized wall functions for low-speed fluids, valid for all $y^+$, - Taking into account transversal effects. - Accounting for the compressible feature of the flow on adiabatic walls without using informations on the local boun...

  12. Cell wall remodelling enzymes modulate fungal cell wall elasticity and osmotic stress resistance

    OpenAIRE

    Ene, Iuliana; Walker, Louise; Schiavone, Marion; Lee, Keunsook K.; Dague, Etienne; Gow, Neil A.R.; Munro, Carol A

    2015-01-01

    The fungal cell wall confers cell morphology and protection against environmental insults. For fungal pathogens, the cell wall is a key immunological modulator and an ideal therapeutic target. Yeast cell walls possess an inner matrix of interlinked β-glucan and chitin that is thought to provide tensile strength and rigidity. Yeast cells remodel their walls over time in response to environmental change, a process controlled by evolutionarily conserved stress (Hog1) and cell integrity (Mkc1, Ce...

  13. Regulation of Cell Wall Biogenesis in Saccharomyces cerevisiae: The Cell Wall Integrity Signaling Pathway

    OpenAIRE

    Levin, David E.

    2011-01-01

    The yeast cell wall is a strong, but elastic, structure that is essential not only for the maintenance of cell shape and integrity, but also for progression through the cell cycle. During growth and morphogenesis, and in response to environmental challenges, the cell wall is remodeled in a highly regulated and polarized manner, a process that is principally under the control of the cell wall integrity (CWI) signaling pathway. This pathway transmits wall stress signals from the cell surface to...

  14. When Walls are No Longer Barriers: Perception of Wall Height in Parkour

    OpenAIRE

    Taylor, J. Eric T.; Witt, Jessica; Sugovic, Mila

    2011-01-01

    Through training, skilled parkour athletes (traceurs) overcome everyday obstacles, such as walls, that are typically insurmountable. Traceurs and untrained novices estimated the height of walls and reported their anticipated ability to climb the wall. The traceurs perceived the walls as shorter than did novices. This result suggests that perception is scaled by the perceiver’s anticipated ability to act, and is consistent with the action-specific account of perception.

  15. When walls are no longer barriers: perception of wall height in parkour.

    Science.gov (United States)

    Taylor, J Eric T; Witt, Jessica K; Sugovic, Mila

    2011-01-01

    Through training, skilled parkour athletes (traceurs) overcome everyday obstacles, such as walls, that are typically insurmountable. Traceurs and untrained novices estimated the height of walls and reported their anticipated ability to climb the wall. The traceurs perceived the walls as shorter than did novices. This result suggests that perception is scaled by the perceiver's anticipated ability to act, and is consistent with the action-specific account of perception. PMID:21936305

  16. Cell wall proteins: a new insight through proteomics

    OpenAIRE

    Jamet, Elisabeth; Canut, Hervé; Boudart, Georges; Pont-Lezica, Rafael F

    2006-01-01

    Cell wall proteins are essential constituents of plant cell walls; they are involved in modifications of cell wall components, wall structure, signaling and interactions with plasma membrane proteins at the cell surface. The application of proteomic approaches to the cell wall compartment raises important questions: are there technical problems specific to cell wall proteomics? What kinds of proteins can be found in Arabidopsis walls? Are some of them unexpected? What sort of post-translation...

  17. THz reflectometric imaging of medieval wall paintings

    DEFF Research Database (Denmark)

    Dandolo, Corinna Ludovica Koch; Jepsen, Peter Uhd

    2013-01-01

    Terahertz time-domain reflectometry has been applied to the investigation of a medieval Danish wall painting. The technique has been able to detect the presence of carbonblack layer on the surface of the wall painting and a buried insertion characterized by high reflectivity values has been found...

  18. Near-wall serpentine cooled turbine airfoil

    Science.gov (United States)

    Lee, Ching-Pang

    2014-10-28

    A serpentine coolant flow path is formed by inner walls in a cavity between pressure and suction side walls of a turbine airfoil, the cavity partitioned by one or more transverse partitions into a plurality of continuous serpentine cooling flow streams each having a respective coolant inlet.

  19. Synovial sarcoma of the abdominal wall

    International Nuclear Information System (INIS)

    A case report of synovial sarcoma arising in the abdominal wall is presented. A brief review of the clinical and radiological features of synovial sarcoma is made. Pre-operative diagnosis of an abdominal wall synovial sarcoma is virtually impossible, but should be considered when a soft tissue swelling is found to show amorphous stippled calcification X-ray. (author)

  20. Domain wall fermions in vector gauge theories

    OpenAIRE

    Blum, T.

    1998-01-01

    I review domain wall fermions in vector gauge theories. Following a brief introduction, the status of lattice calculations using domain wall fermions is presented. I focus on results from QCD, including the light quark masses and spectrum, weak matrix elements, the $n_f=2$ finite temperature phase transition, and topology and zero modes and conclude with topics for future study.

  1. Abdominal Wall Modification for the Difficult Ostomy

    OpenAIRE

    Beck, David E.

    2008-01-01

    A select group of patients with major stomal problems may benefit from operative modification of the abdominal wall. Options may include a modified abdominoplasty (abdominal wall contouring), localized flaps, or liposuction. Although frequently successful, these techniques have the potential for significant morbidity.

  2. Ballistic Limit Equation for Single Wall Titanium

    Science.gov (United States)

    Ratliff, J. M.; Christiansen, Eric L.; Bryant, C.

    2009-01-01

    Hypervelocity impact tests and hydrocode simulations were used to determine the ballistic limit equation (BLE) for perforation of a titanium wall, as a function of wall thickness. Two titanium alloys were considered, and separate BLEs were derived for each. Tested wall thicknesses ranged from 0.5mm to 2.0mm. The single-wall damage equation of Cour-Palais [ref. 1] was used to analyze the Ti wall's shielding effectiveness. It was concluded that the Cour-Palais single-wall equation produced a non-conservative prediction of the ballistic limit for the Ti shield. The inaccurate prediction was not a particularly surprising result; the Cour-Palais single-wall BLE contains shield material properties as parameters, but it was formulated only from tests of different aluminum alloys. Single-wall Ti shield tests were run (thicknesses of 2.0 mm, 1.5 mm, 1.0 mm, and 0.5 mm) on Ti 15-3-3-3 material custom cut from rod stock. Hypervelocity impact (HVI) tests were used to establish the failure threshold empirically, using the additional constraint that the damage scales with impact energy, as was indicated by hydrocode simulations. The criterion for shield failure was defined as no detached spall from the shield back surface during HVI. Based on the test results, which confirmed an approximately energy-dependent shield effectiveness, the Cour-Palais equation was modified.

  3. Cell wall composition of chlorococcal algae

    OpenAIRE

    Blumreisinger, Maria; Meindl, Doris; Loos, Eckhard

    1983-01-01

    The cell walls of representatives of the genera Chlorella, Monoraphidium, Ankistrodesmus and Scenedesmus contained 24–74% neutral sugars, 1–24% uronic acids, 2–16% protein and 0–15% glucosamine. Two types of cell walls could be discerned containing as main sugars either rhamnose and galactose or mannose and glucose with a lack of galactose.

  4. Risk Assessment of Energy-Efficient Walls

    Energy Technology Data Exchange (ETDEWEB)

    Pallin, Simon B. [Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Hun, Diana E. [Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Jackson, Roderick K. [Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Kehrer, Manfred [Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

    2014-12-01

    This multi-year project aims to provide the residential construction industry with energy-efficient wall designs that are moisture durable. The present work focused on the initial step of this project, which is to develop a moisture durability protocol that identifies energy efficient wall designs that have a low probability of experiencing moisture problems.

  5. Statistical analysis of silo wall pressures

    DEFF Research Database (Denmark)

    Ditlevsen, Ove Dalager; Berntsen, Kasper Nikolaj

    1998-01-01

    Previously published silo wall pressure measurements during plug flow of barley in alarge concrete silo are re-analysed under the hypothesis that the wall pressures are gamma-distributed.The fits of the gamma distribution type to the local pressure data from each measuring cell are satisfactory.H...

  6. 14 CFR 121.245 - Fire walls.

    Science.gov (United States)

    2010-01-01

    ... 14 Aeronautics and Space 3 2010-01-01 2010-01-01 false Fire walls. 121.245 Section 121.245 Aeronautics and Space FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION (CONTINUED) AIR CARRIERS..., FLAG, AND SUPPLEMENTAL OPERATIONS Special Airworthiness Requirements § 121.245 Fire walls. Each...

  7. Safranine fluorescent staining of wood cell walls.

    Science.gov (United States)

    Bond, J; Donaldson, L; Hill, S; Hitchcock, K

    2008-06-01

    Safranine is an azo dye commonly used for plant microscopy, especially as a stain for lignified tissues such as xylem. Safranine fluorescently labels the wood cell wall, producing green/yellow fluorescence in the secondary cell wall and red/orange fluorescence in the middle lamella (ML) region. We examined the fluorescence behavior of safranine under blue light excitation using a variety of wood- and fiber-based samples of known composition to interpret the observed color differentiation of different cell wall types. We also examined the basis for the differences in fluorescence emission using spectral confocal microscopy to examine lignin-rich and cellulose-rich cell walls including reaction wood and decayed wood compared to normal wood. Our results indicate that lignin-rich cell walls, such as the ML of tracheids, the secondary wall of compression wood tracheids, and wood decayed by brown rot, tend to fluoresce red or orange, while cellulose-rich cell walls such as resin canals, wood decayed by white rot, cotton fibers and the G-layer of tension wood fibers, tend to fluoresce green/yellow. This variation in fluorescence emission seems to be due to factors including an emission shift toward red wavelengths combined with dye quenching at shorter wavelengths in regions with high lignin content. Safranine fluorescence provides a useful way to differentiate lignin-rich and cellulose-rich cell walls without counterstaining as required for bright field microscopy. PMID:18802812

  8. Component Separation for Complex Abdominal Wall Reconstruction

    Medline Plus

    Full Text Available COMPONENT SEPARATION FOR COMPLEX ABDOMINAL WALL RECONSTRUCTION ALBANY MEDICAL CENTER ALBANY, NY April 30, 2008 00:00:07 ANNOUNCER: This event is being ... the premiere webcast of a component separation for complex abdominal-wall reconstruction, performed by Dr. Jerome D. ...

  9. Reduced order modeling of wall turbulence

    Science.gov (United States)

    Moin, Parviz

    2015-11-01

    Modeling turbulent flow near a wall is a pacing item in computational fluid dynamics for aerospace applications and geophysical flows. Gradual progress has been made in statistical modeling of near wall turbulence using the Reynolds averaged equations of motion, an area of research where John Lumley has made numerous seminal contributions. More recently, Lumley and co-workers pioneered dynamical systems modeling of near wall turbulence, and demonstrated that the experimentally observed turbulence dynamics can be predicted using low dimensional dynamical systems. The discovery of minimal flow unit provides further evidence that the near wall turbulence is amenable to reduced order modeling. The underlying rationale for potential success in using low dimensional dynamical systems theory is based on the fact that the Reynolds number is low in close proximity to the wall. Presumably for the same reason, low dimensional models are expected to be successful in modeling of the laminar/turbulence transition region. This has been shown recently using dynamic mode decomposition. Furthermore, it is shown that the near wall flow structure and statistics in the late and non-linear transition region is strikingly similar to that in higher Reynolds number fully developed turbulence. In this presentation, I will argue that the accumulated evidence suggests that wall modeling for LES using low dimensional dynamical systems is a profitable avenue to pursue. The main challenge would be the numerical integration of such wall models in LES methodology.

  10. Mechanics of the Toxoplasma gondii oocyst wall

    Science.gov (United States)

    The ability of microorganisms to survive under extreme conditions is closely related to the physicochemical properties of their wall. In the ubiquitous protozoan parasite Toxoplasma gondii, the oocyst stage possesses a bilayered wall that protects the dormant but potentially infective parasites from...

  11. Pressure equalisation of brick masonry cavity walls

    NARCIS (Netherlands)

    Geurts, C.P.W.; Bouma, P.W.; Aghaei, A.

    2005-01-01

    This paper describes two full-scale experiments in which the pressure distribution over the layers of brick masonry cavity walls is studied. The first experiment focuses on the specification of the wind loads on both outer and inner leafs of these walls. The second experiment is set-up to find a mod

  12. Diaphragm walling for Sizewell B sets records

    International Nuclear Information System (INIS)

    The first phase of construction of the Sizewell-B nuclear reactor has been completed. This was the building of a diaphragm wall around the site. It is one of the largest and deepest diaphragm walls to be installed in Europe. The site can be pumped dry of groundwater and the foundations constructed in the dry. The specifications of the wall and its construction, using two Hydrofraise excavation rigs, are described. The excavated material is brought up as a slurry and the (bentonite) slurry is cleaned and desanded. Most of the wall has been formed using a plastic concrete but reinforced concrete has been used for some stretches. The diaphragm wall, which is 1258m long and 55m deep on average, was built in 19 weeks. (U.K.)

  13. Statistical analysis of silo wall pressures

    DEFF Research Database (Denmark)

    Ditlevsen, Ove Dalager; Berntsen, Kasper Nikolaj

    Previously published silo wall pressure measurements during plug flow of barley in alarge concrete silo are re-analysed under the hypothesis that the wall pressures are gamma-distributed.The fits of the gamma distribution type to the local pressure data from each measuring cell are satisfactory.......However, the estimated parameters of the gamma distributions turn out to be significantly inhomogeneous overthe silo wall surface. This inhomogeneity is attributed to the geometrical imperfections of the silo wall.Motivated by the engineering importance of the problem a mathematical model for constructing...... astochastic gamma-type continuous pressure field is given. The model obeys the necessary equilibrium conditionsof the wall pressure field and reflects the spatial correlation properties as estimated from simultaneouslymeasured pressures at different locations along a horizontal perimeter....

  14. Hydrodynamics of ultra-relativistic bubble walls

    CERN Document Server

    Leitao, Leonardo

    2015-01-01

    In cosmological first-order phase transitions, gravitational waves are generated by the collisions of bubble walls and by the bulk motions caused in the fluid. A sizeable signal may result from fast-moving walls. In this work we study the hydrodynamics associated to the fastest propagation modes, namely, ultra-relativistic detonations and runaway solutions. We compute the energy injected by the phase transition into the fluid and the energy which accumulates in the bubble walls. We provide analytic approximations and fits as functions of the net force acting on the wall, which can be readily evaluated for specific models. We also study the back-reaction of hydrodynamics on the wall motion, and we discuss on the extrapolation of the friction force away from the ultra-relativistic limit.

  15. Automotion of domain walls for spintronic interconnects

    Science.gov (United States)

    Nikonov, Dmitri E.; Manipatruni, Sasikanth; Young, Ian A.

    2014-06-01

    We simulate "automotion," the transport of a magnetic domain wall under the influence of demagnetization and magnetic anisotropy, in nanoscale spintronic interconnects. In contrast to spin transfer driven magnetic domain wall motion, the proposed interconnects operate without longitudinal charge current transfer, with only a transient current pulse at domain wall creation and have favorable scaling down to the 20 nm dimension. Cases of both in-plane and out-of-plane magnetization are considered. Analytical dependence of the velocity of domain walls on the angle of magnetization are compared with full micromagnetic simulations. Deceleration, attenuation and disappearance, and reflection of domain walls are demonstrated through simulation. Dependences of the magnetization angle on the current pulse parameters are studied. The energy and delay analysis suggests that automotion is an attractive option for spintronic logic interconnects.

  16. Automotion of domain walls for spintronic interconnects

    International Nuclear Information System (INIS)

    We simulate “automotion,” the transport of a magnetic domain wall under the influence of demagnetization and magnetic anisotropy, in nanoscale spintronic interconnects. In contrast to spin transfer driven magnetic domain wall motion, the proposed interconnects operate without longitudinal charge current transfer, with only a transient current pulse at domain wall creation and have favorable scaling down to the 20 nm dimension. Cases of both in-plane and out-of-plane magnetization are considered. Analytical dependence of the velocity of domain walls on the angle of magnetization are compared with full micromagnetic simulations. Deceleration, attenuation and disappearance, and reflection of domain walls are demonstrated through simulation. Dependences of the magnetization angle on the current pulse parameters are studied. The energy and delay analysis suggests that automotion is an attractive option for spintronic logic interconnects.

  17. Wind Load Test of Earthbag Wall

    Directory of Open Access Journals (Sweden)

    Ryan Scott

    2013-08-01

    Full Text Available Earthbag construction is a sustainable, low-cost, housing option for developing countries. Earthbag structures are built of individual soil-filled fabric bags (i.e., sand bags stacked in a running bond pattern. Once stacked, earthbags are compacted and the soil inside the bags is dried in-place to form earthen bricks. Barbed wires are placed between each course to affect shear transfer within the wall. Results of an out-of-plane load test on a full-scale earthbag wall are presented in this paper. The wall was subjected to out-of-plane pressure up to 3.16 kPa, which resulted in plastic deformations up to 50 mm. The wall did not collapse during loading. Wall behavior and force transfer mechanisms are discussed.

  18. Automotion of domain walls for spintronic interconnects

    Energy Technology Data Exchange (ETDEWEB)

    Nikonov, Dmitri E.; Manipatruni, Sasikanth; Young, Ian A. [Exploratory Integrated Circuits, Components Research, Intel Corp., Hillsboro, Oregon 97124 (United States)

    2014-06-07

    We simulate “automotion,” the transport of a magnetic domain wall under the influence of demagnetization and magnetic anisotropy, in nanoscale spintronic interconnects. In contrast to spin transfer driven magnetic domain wall motion, the proposed interconnects operate without longitudinal charge current transfer, with only a transient current pulse at domain wall creation and have favorable scaling down to the 20 nm dimension. Cases of both in-plane and out-of-plane magnetization are considered. Analytical dependence of the velocity of domain walls on the angle of magnetization are compared with full micromagnetic simulations. Deceleration, attenuation and disappearance, and reflection of domain walls are demonstrated through simulation. Dependences of the magnetization angle on the current pulse parameters are studied. The energy and delay analysis suggests that automotion is an attractive option for spintronic logic interconnects.

  19. 2003 Plant Cell Walls Gordon Conference

    Energy Technology Data Exchange (ETDEWEB)

    Daniel J. Cosgrove

    2004-09-21

    This conference will address recent progress in many aspects of cell wall biology. Molecular, genetic, and genomic approaches are yielding major advances in our understanding of the composition, synthesis, and architecture of plant cell walls and their dynamics during growth, and are identifying the genes that encode the machinery needed to make their biogenesis possible. This meeting will bring together international scientists from academia, industry and government labs to share the latest breakthroughs and perspectives on polysaccharide biosynthesis, wood formation, wall modification, expansion and interaction with other organisms, and genomic & evolutionary analyses of wall-related genes, as well as to discuss recent ''nanotechnological'' advances that take wall analysis to the level of a single cell.

  20. Mirror, mirror on the wall

    CERN Multimedia

    2005-01-01

    RICH 2, one of the two Ring Imaging Cherenkov detectors of the LHCb experiment, is being prepared to join the other detector elements ready for the first proton-proton collisions at LHC. The mirrors of the RICH2 detector are meticulously assembled in a clean room.In a large dark room, men in white move around an immense structure some 7 metres high, 10 metres wide and nearly 2.5 metres deep. Apparently effortlessly, they are installing the two large high-precision spherical mirrors. These mirrors will focus Cherenkov light, created by the charged particles that will traverse this detector, onto the photon detectors. Each spherical mirror wall is made up of facets like a fly's eye. Twenty-eight individual thin glass mirrors will all point to the same point in space to within a few micro-radians. The development of these mirrors has been technically demanding : Ideally they should be massless, sturdy, precise and have high reflectivity. In practice, though not massless, they are made from a mere 6 mm thin gl...

  1. Classification of chest wall diseases.

    Science.gov (United States)

    Pozzi, E; Gulotta, C

    1993-01-01

    Several disorders of the thoracic cage are known to cause respiratory failure, by means of relatively simple mechanisms, such as the increased work of breathing, which results in alveolar hypoventilation. A variety of pathogenic mechanisms may be considered, as functions of the types of thoracic disorders present. As causes of these additional potential mechanisms, we considered the following: 1) ventilation-perfusion (V/Q) inhomogeneity; 2) inability to cough; 3) malformation or acquired defect of the respiratory centres; and 4) excess blood volume and fluid retention, which aggravate work of breathing and V/Q inhomogeneity. All of these disorders can be grouped into two major categories (which nevertheless have some of the pathophysiology in common): the mechanical syndrome and the neuromuscular or paralytic syndrome. In this paper we discuss chest wall diseases falling into the first category; namely, kyphoscoliosis, fibrothorax, thoracoplasty, ankylosing spondylitis and obesity-hypoventilation. Congenital deformities of the thoracic cage, which do not have important effects on ventilatory apparatus (e.g. pectus excavatum and pectus carinatum), were also considered. PMID:8472068

  2. Evolution of string-wall networks and axionic domain wall problem

    International Nuclear Information System (INIS)

    We study the cosmological evolution of domain walls bounded by strings which arise naturally in axion models. If we introduce a bias in the potential, walls become metastable and finally disappear. We perform two dimensional lattice simulations of domain wall networks and estimate the decay rate of domain walls. By using the numerical results, we give a constraint for the bias parameter and the Peccei-Quinn scale. We also discuss the possibility to probe axion models by direct detection of gravitational waves produced by domain walls

  3. Future steam generator designs. Single wall designs

    International Nuclear Information System (INIS)

    to be cut off and only extremely limited and difficult access to the tube plate can be obtained. Thus, for the replacement PFR superheater and reheater now in production, design changes have been introduced which improve the facilities for inspection, improve the engineering integrity of the sodium/water boundary and will enable NPC to prove the new units under real power station operating conditions. The CDFR design is a scaled up replica of the replacement Units and we, therefore, hope to validate the CDFR design by the successful operation in PFR of the new prototype units some time during 1981. It is worthwhile to comment upon the potential advantages of the gas space' requirement in the PFR type of removable 'U' tube. With regard to sodium/water reaction events in the high risk area of the PFR Steam Generators has proved to be in the tube to tube sheet welds and it is fortuitous that the provision of a sodium side gas space enables the designer to incorporate a highly sensitive leak detection system, with a large 'window of protection' value for the monitoring of the critical weld feature. Thus, if the operator wishes, he can lower the level of the sodium during leak location operations and convert what would be a more onerous under-sodium leak into a gas space. leak. If any opening up operations are required, then this could be of some advantage. Design changes from PFR to CDFR as incorporated into the prototype replacement steam generators are shown

  4. Automatic configuration of modular vault walls

    Directory of Open Access Journals (Sweden)

    Grković Vladan

    2012-01-01

    Full Text Available Products such as modular partition walls of vault rooms (with or without vault doors are made at the request of the client who chooses the safety degree and provides the available dimensions of the wall that should be made. Modular construction of vault walls is the system of construction of industrially made elements which are composed in situ, which allows design of products adjusted to individual requirements of clients. Since the vault wall modules repeat in every new project and since they differ only by their number and dimensions, the use of modern CA (Computer Aided tools and the possibility of application of parameter and variant design shorten design time and eliminate possible errors in the process of design of modular vault walls, which reduces the costs of production and increases the level of product quality. The paper presents the procedure for calculation of parameters of parts, modules and the entire vault wall in Microsoft Excel based on which the 3D model of a modular vault wall is automatically configured and developed in software package Autodesk Inventor. [Projekat Ministarstva nauke Republike Srbije, br. TR37020

  5. Electron-wall interaction in Hall thrusters

    International Nuclear Information System (INIS)

    Electron-wall interaction effects in Hall thrusters are studied through measurements of the plasma response to variations of the thruster channel width and the discharge voltage. The discharge voltage threshold is shown to separate two thruster regimes. Below this threshold, the electron energy gain is constant in the acceleration region and therefore, secondary electron emission (SEE) from the channel walls is insufficient to enhance electron energy losses at the channel walls. Above this voltage threshold, the maximum electron temperature saturates. This result seemingly agrees with predictions of the temperature saturation, which recent Hall thruster models explain as a transition to space-charge saturated regime of the near-wall sheath. However, in the experiment, the maximum saturation temperature exceeds by almost three times the critical value estimated under the assumption of a Maxwellian electron energy distribution function. The channel narrowing, which should also enhance electron-wall collisions, causes unexpectedly larger changes of the plasma potential distribution than does the increase of the electron temperature with the discharge voltage. An enhanced anomalous crossed-field mobility (near wall or Bohm-type) is suggested by a hydrodynamic model as an explanation to the reduced electric field measured inside a narrow channel. We found, however, no experimental evidence of a coupling between the maximum electron temperature and the location of the accelerating voltage drop, which might have been expected due to the SEE-induced near-wall conductivity

  6. Living walls for the Vancouver Aquarium

    Energy Technology Data Exchange (ETDEWEB)

    Sharp, R. [Sharp and Diamond Landscape Architecture and Planning, Vancouver, BC (Canada)]|[Verdir Systems Inc., Abbotsford, BC (Canada)

    2005-07-01

    Thermal living walls are developed for exterior locations to provide many of the benefits of green roofs, while also providing greenery in visible locations. Living walls can be used to provide shading, thermal mass, and air filtration for buildings and wildlife habitats. This paper provided details of a set of living walls proposed for the Vancouver Aquarium. The walls were comprised of pockets of growing medium wrapped in moisture retention felt and porous black pumice in an aluminum framework. The pockets were designed to replicate pockets in natural rock faces that support ferns, sedum, columbine and other rainforest plants. The plants were grown from cuttings or plugs anchored in the growing medium. Some plant species were selected to spread by tentacles clinging on to the porous volcanic rock. Soaker hoses will be used to provide moisture weeping down the walls during periods of drought. White roofs will provide cool rainwater which will flow through a series of rainwater gardens and cascade down several terraces. An ecological-based approach was proposed for the Aquarium walls to reduce the requirements for watering, fertilizer and maintenance. The layers and rock pockets have been designed to provide vertical habitats and shelter for a variety of wildlife species. Trellis systems and facade green structures have been designed to connect habitat on green roofs to the ground. It was concluded that the aquarium's living wall will help to educate and inspire the next generation of environmental leaders. A review of innovative living wall and green architecture precedents from around the world included bio-climatic skyscrapers in Malaysia, mur vegetal systems in France, biowalls in Canada; and plant walls in Japan. 8 refs., 19 figs.

  7. Design of JT-60 first wall

    International Nuclear Information System (INIS)

    This paper describes an outline of JT-60 first wall design. Main purpose of JT-60 is to achieve reactor grade plasma and maintain 5 -- 10 sec plasma discharge. Therefore, the requirements from physics and engineering aspects are extremely severe than the one in currently operating tokamak. In FY1974 -- 1976, to make clear the points at issue and the technological prospects, a number of examinations and R and D works have been performed. As a result, molybdenum has been selected as a JT-60 first wall material. Also, toroidal fixed limiter, magnetic limiter plate and liner have been applied as first wall structures. Since a time constant of plasma current decay during a disruption was changed from 50 msec to 1 msec (Target value), liner material was changed to Inconel 625. Mechanical design criterion is based on ASME Section III code. All first wall components are designed to withstand the mechanical load at 3 msec plasma disruption. Design values of heat flux and duration time are 305 w/cm2 and 10 sec for the toroidal fixed limiter, and 440 w/cm2 and 5 sec for the magnetic limiter plate, respectively. Interval time between discharges is 10 min. Design values of the maximum surface temperature are 900sup( o)C for molybdenum and 600sup( o)C for Inconel 625, respectively. First wall structure is designed to protect bellows, thermocouples and electromagnetic sensors against severe plasma thermal load. Also, the first wall can be exchanged easily for first wall experiment. Titanium carbide, 20 μm in thick, are coated onto the first wall. Details of the first wall design will be published in another reports. (author)

  8. Bosonic interactions with a domain wall

    CERN Document Server

    Morris, J R

    2016-01-01

    We consider here the interaction of scalar bosons with a topological domain wall. Not only is there a continuum of scattering states, but there is also an interesting "quasi-discretuum" of positive energy bosonic bound states, describing bosons entrapped within the wall's core. The full spectrum of the scattering and bound state energies and eigenstates is obtainable from a Schr\\"odinger-type of equation with a P\\"oschl-Teller potential. We also consider the presence of a boson gas within the wall and high energy boson emission.

  9. Development of wall ranging radiation inspection robot

    International Nuclear Information System (INIS)

    With the aging of nation's nuclear facilities, the target of this project is to develop an under water wall ranging robotic vehicle which inspects the contamination level of the research reactor (TRIGA MARK III) as a preliminary process to dismantling. The developed vehicle is driven by five thrusters and consists of small sized control boards, and absolute position detector, and a radiation detector. Also, the algorithm for autonomous navigation is developed and its performance is tested through under water experiments. Also, the test result at the research reactor shows that the vehicle firmly attached the wall while measuring the contamination level of the wall

  10. Flow Modeling Based Wall Element Technique

    Directory of Open Access Journals (Sweden)

    Sabah Tamimi

    2012-08-01

    Full Text Available Two types of flow where examined, pressure and combination of pressure and Coquette flow of confined turbulent flow with a one equation model used to depict the turbulent viscosity of confined flow in a smooth straight channel when a finite element technique based on a zone close to a solid wall has been adopted for predicting the distribution of the pertinent variables in this zone and examined even with case when the near wall zone was extended away from the wall. The validation of imposed technique has been tested and well compared with other techniques.

  11. Development of wall ranging radiation inspection robot

    Energy Technology Data Exchange (ETDEWEB)

    Lee, B. J.; Yoon, J. S.; Park, Y. S.; Hong, D. H.; Oh, S. C.; Jung, J. H.; Chae, K. S

    1999-03-01

    With the aging of nation's nuclear facilities, the target of this project is to develop an under water wall ranging robotic vehicle which inspects the contamination level of the research reactor (TRIGA MARK III) as a preliminary process to dismantling. The developed vehicle is driven by five thrusters and consists of small sized control boards, and absolute position detector, and a radiation detector. Also, the algorithm for autonomous navigation is developed and its performance is tested through under water experiments. Also, the test result at the research reactor shows that the vehicle firmly attached the wall while measuring the contamination level of the wall.

  12. Effective action of domain wall networks

    International Nuclear Information System (INIS)

    U(NC) gauge theory with NF fundamental scalars admits BPS junctions of domain walls. When the networks/webs of these walls contain loops, their size moduli give localized massless modes. We construct Kaehler potential of their effective action. In the large size limit Kaehler metric is well approximated by kinetic energy of walls and junctions, which is understood in terms of tropical geometry. Kaehler potential can be expressed in terms of hypergeometric functions that are useful to understand small size behavior. Even when the loop shrinks, the metric is regular with positive curvature. Moduli space of a single triangle loop has a geometry between a cone and a cigar

  13. Refractive index of plant cell walls

    Science.gov (United States)

    Gausman, H. W.; Allen, W. A.; Escobar, D. E.

    1974-01-01

    Air was replaced with media of higher refractive indices by vacuum infiltration in leaves of cucumber, blackeye pea, tomato, and string bean plants, and reflectance of noninfiltrated and infiltrated leaves was spectrophotometrically measured. Infiltrated leaves reflected less light than noninfiltrated leaves over the 500-2500-nm wavelength interval because cell wall-air interfaces were partly eliminated. Minimal reflectance should occur when the average refractive index of plant cell walls was matched by the infiltrating fluid. Although refractive indices that resulted in minimal reflectance differed among the four plant genera, an average value of 1.425 approximates the refractive index of plant cell walls for the four plant genera.

  14. Wall shear stress manifolds and near wall flow topology in aneurysms

    Science.gov (United States)

    Arzani, Amirhossein; Gambaruto, Alberto M.; Chen, Guoning; Shadden, Shawn C.

    2015-11-01

    Transport of atherogenic and thrombogenic chemicals near the vessel wall highly influences atherosclerosis and thrombosis. The high Schmidt number of these species leads to a thin concentration boundary layer near the wall. The wall shear stress (WSS) vector field can be scaled to obtain the near wall velocity in this region, thus providing first order approximation to near wall transport. In this study, the complex blood flow in patient-specific abdominal aortic aneurysms was considered. Lagrangian tracking of surface-bound tracers representing near wall species was employed to identify Lagrangian coherent structures (LCS) for the WSS surface vector field. The WSS LCS matched the stable and unstable manifolds of saddle type fixed points of the time-average WSS vector field, due to the quasi-steady nature of these near wall transport processes. A WSS exposure time measure is introduced to quantify the concentration of near wall species. The effect of diffusion and normal flow on these structures is investigated. The WSS LCS highly influence the concentration of near wall species, and provide a template for near-wall transport.

  15. Disruption of hydrogen bonding between plant cell wall polymers by proteins that induce wall extension.

    Science.gov (United States)

    McQueen-Mason, S; Cosgrove, D J

    1994-07-01

    Plant cell enlargement is controlled by the ability of the constraining cell wall to expand. This ability has been postulated to be under the control of polysaccharide hydrolases or transferases that weaken or rearrange the loadbearing polymeric networks in the wall. We recently identified a family of wall proteins, called expansins, that catalyze the extension of isolated plant cell walls. Here we report that these proteins mechanically weaken pure cellulose paper in extension assays and stress relaxation assays, without detectable cellulase activity (exo- or endo- type). Because paper derives its mechanical strength from hydrogen bonding between cellulose microfibrils, we conclude that expansins can disrupt hydrogen bonding between cellulose fibers. This conclusion is further supported by experiments in which expansin-mediated wall extension (i) was increased by 2 M urea (which should weaken hydrogen bonding between wall polymers) and (ii) was decreased by replacement of water with deuterated water, which has a stronger hydrogen bond. The temperature sensitivity of expansin-mediated wall extension suggests that units of 3 or 4 hydrogen bonds are broken by the action of expansins. In the growing cell wall, expansin action is likely to catalyze slippage between cellulose microfibrils and the polysaccharide matrix, and thereby catalyze wall stress relaxation, followed by wall surface expansion and plant cell enlargement. PMID:11607483

  16. Homogenization of a viscoelastic model for plant cell wall biomechanics

    OpenAIRE

    Ptashnyk, Mariya; Seguin, Brian

    2015-01-01

    The microscopic structure of a plant cell wall is given by cellulose microfibrils embedded in a cell wall matrix. In this paper we consider a microscopic model for interactions between viscoelastic deformations of a plant cell wall and chemical processes in the cell wall matrix. We consider elastic deformations of the cell wall microfibrils and viscoelastic Kelvin--Voigt type deformations of the cell wall matrix. Using homogenization techniques (two-scale convergence and periodic unfolding me...

  17. Plant cell wall proteomics: the leadership of Arabidopsis thaliana

    OpenAIRE

    Albenne, Cécile; Canut, Hervé; Jamet, Elisabeth

    2013-01-01

    Plant cell wall proteins (CWPs) progressively emerged as crucial components of cell walls although present in minor amounts. Cell wall polysaccharides such as pectins, hemicelluloses, and cellulose represent more than 90% of primary cell wall mass, whereas hemicelluloses, cellulose, and lignins are the main components of lignified secondary walls. All these polymers provide mechanical properties to cell walls, participate in cell shape and prevent water loss in aerial organs. However, cell wa...

  18. NEW RSW & Wall Medium Fully Tetrahedral Grid

    Data.gov (United States)

    National Aeronautics and Space Administration — New Medium Fully Tetrahedral RSW Grid with viscous wind tunnel wall at the root. This grid is for a node-based unstructured solver. Medium Tet: Quad Surface Faces=...

  19. NEW RSW & Wall Coarse Mixed Element Grid

    Data.gov (United States)

    National Aeronautics and Space Administration — This is the Coarse Mixed Element Grid for the RSW with a viscous wall at the root. This grid is for a node-based unstructured solver. Quad Surface Faces= 9728 Tria...

  20. Wall Shear Rates in Taylor Vortex Flow

    Directory of Open Access Journals (Sweden)

    V. Sobolik

    2011-01-01

    Full Text Available Wall shear rate and its axial and azimuthal components were evaluated in stable Taylor vortices. The measurements were carried out in a broad interval of Taylor numbers (52-725 and several gap width (R1/R2 = 0.5 – 0.8 by two three-segment electrodiffusion probes and three single probes flush mounted in the wall of the outer fixed cylinder. The axial distribution of wall shear rate components was obtained by sweeping the vortices along the probes using a slow axial flow. The experimental results were verified by CFD simulations. The knowledge of local wall shear rates and its fluctuations is of primordial interest for industrial applications like tangential filtration, membrane reactors and bioreactors containing shear sensitive cells.