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Sample records for steel x6crni1811 din

  1. Creep-rupture-test on the stainless steel X6crni1811 (Din 1.494.8) in the frame of the Extrapolation-Program. (Part III)

    International Nuclear Information System (INIS)

    Solano, R.; Schirra, M.; Rivas, M. de la; Barroso, S.; Seith, B.

    1982-01-01

    The austenitic stainless steel X6crni1811 (Din 1.4948) used as a structure material for the German Fast Breeder Reactor SNR 300 was creep tested in a temperature range of 550-650 degree centigree material condition as well as welded material condition. The main point of this program (Extrapolation-Program) lies in the knowledge of the creep-rupture-strength and creep-behaviour up to 3 x 10 4 hours higher temperatures in order to extrapolated up to ≥10 5 hours for operating temperatures. In order to study the stress dependency of the minimum creep rate additional tests were carried out of 550 degree centigree - 750 degree centigree. The present report describes the state in the running program with test-times of 23.000 hours and results from tests up to 55.000 hours belonging to other parallel programs are taken into account. Besides the creep-rupture behaviour it is also made a study of ductility between 550 and 750 degree centigree. Extensive metallographic examinations have been made to study the fracture behaviour and changes in structure. (Author)

  2. Creep-rupture-test on the stainless steel X6CRNI1811 (DIN 1.4948) in the frame of the ''Extrapolation-Program''. (Part III)

    International Nuclear Information System (INIS)

    Solano, R.; Las Rivas, M. de; Barroso, S.

    1982-01-01

    The austenitic stainless steel X6CrNi1811 (DIN 1.4948) used as a structure material for the German Fast Breeder Reactor SNR 300 was creep tested in a temperature range of 550-650 deg under base material condition as well as welded material condition. The main point of this program (''Extrapolation-Program'') lies in the knowledge of the creep-rupture-strength and creepbehaviour up to 3 x 10 4 hours at higher temperatures in order to extrapolate up to >=10 5 hours for operating temperatures. In order to study the stress dependency of the minimum creep rate additional tests were carried out of 550 deg - 750 deg C. The present report describes the state in the running program with test-times of 23.000 hours and results from tests up to 55.000 hours belonging to other parallel programs are taken into account. Besides the creep-rupture behaviour it is also made a study of ductility between 550 and 750 deg C. Extensive metallographic examinations have been made to study the fracture behaviour and changes in structure. (author)

  3. Creep-rupture-test on the stainless steel X6crni1811 (Din 1.494.8) in the frame of the Extrapolation-Program. (Part III); Ensayos de fluencia lenta en el acero inoxidable X6 Cr Ni 1811 (1.4948) en el marco del Programa Extrapolacion

    Energy Technology Data Exchange (ETDEWEB)

    Solano, R; Schirra, M; Rivas, M de la; Barroso, S; Seith, B

    1982-07-01

    The austenitic stainless steel X6crni1811 (Din 1.4948) used as a structure material for the German Fast Breeder Reactor SNR 300 was creep tested in a temperature range of 550-650 degree centigree material condition as well as welded material condition. The main point of this program (Extrapolation-Program) lies in the knowledge of the creep-rupture-strength and creep-behaviour up to 3 x 10{sup 4} hours higher temperatures in order to extrapolated up to {>=}10{sup 5} hours for operating temperatures. In order to study the stress dependency of the minimum creep rate additional tests were carried out of 550 degree centigree - 750 degree centigree. The present report describes the state in the running program with test-times of 23.000 hours and results from tests up to 55.000 hours belonging to other parallel programs are taken into account. Besides the creep-rupture behaviour it is also made a study of ductility between 550 and 750 degree centigree. Extensive metallographic examinations have been made to study the fracture behaviour and changes in structure. (Author)

  4. Low and high cycle fatigue behaviour of steel-X6CRNI1811 (Type 304 SS) in air and flowing sodium

    International Nuclear Information System (INIS)

    Huthmann, H.; Jenner, G.

    Strain controlled LCF-tests were performed on X6CrNi1811 steel (Type 304 SS) in air and flowing sodium in a non-isothermal sodium loop. The results measured at 550 deg. C in an upstream position of the sodium loop show an increase in fatigue life in the strain range from about 1.5% to 0.4% for the base material in the as-received condition while the welded joints remain unaffected by the environment. The LCF-behaviour of base material specimens tested at 500 deg. C in a downstream position after a prior pre-exposure to sodium (4058 h, 500 deg. C) is also improved in comparison to parallel specimens tested in air with comparable thermal aging. Load controlled HCF-tests performed on X6CrNi1811 steel at 550 deg. C show a significant increase in fatigue life in the low cycle region (Nsub(f) 6 cycles) and a higher endurance limit for the base material in sodium but no influence of the environment is indicated for the welded joints. (author)

  5. Study of tempering process of a DIN 1.2714 steel modified by niobium

    International Nuclear Information System (INIS)

    Oliveira, Carlos A.S. de.

    1985-01-01

    The carbides precipitaton in a DIN 1.2714 steel modified by niobium are studied. Three austenitizing temperatures (1200, 960 and 860 0 C) after homogenization at 1200 0 C are used; and the precipitation behavior of the carbides on tempering at 600 0 C with respect to time is studied. These precipitates were characterized through the X-ray fluorescence and diffraction and by carbon extraction replica techniques for transmission electron microscope. (M.J.C.) [pt

  6. Fatigue of DIN 1.4914 martensitic stainless steel in a hydrogen environment

    Science.gov (United States)

    Shakib, J. I.; Ullmaier, H.; Little, E. A.; Faulkner, R. G.; Schmilz, W.; Chung, T. E.

    1994-09-01

    Fatigue tests at room temperature in vacuum, air and hydrogen have been carried out on specimens of DIN 1.4914 martensitic stainless steel in load-controlled, push-pull type experiments. Fatigue lifetimes in hydrogen are significantly lower than in both vacuum and air and the degradation is enhanced by lowering the test frequency or introducing hold times into the tension half-cycle. Fractographic examinations reveal hydrogen embrittlement effects in the form of internal cracking between fatigue striations together with surface modifications, particularly at low stress amplitudes. It is suggested that gaseous hydrogen can influence both fatigue crack initiation and propagation events in martensitic steels.

  7. Submerged arc narrow gap welding of the steel DIN 20MnMoNi55

    International Nuclear Information System (INIS)

    Moraes, M.M.

    1987-01-01

    The methodology for submerged arc narrow gap welding for high thickness rolled steel DIN 20MnMoNi55 was developed, using din S3NiMo1 04 mm and 05 mm wires, and DIN 8B435 flux. For this purpose, submerged arc narrow gap welded joints with 50 mm and 120 mm thickness were made aiming the welding parameters optimization and the study of the influence of welding voltage, wire diameter and wire to groove face distance on the operational performance and on the welded joint quality, specially on the ISO-V impact toughness. These welded joints were checked by non-destructive mechanical and metallographic tests. Results were compared with those obtained by one 120 mm thickness submerged arc conventional gap welded joint, using the same base metal and consumables (05 mm wire). The analysis of the results shows that the increasing of the wire to groove face distance and the welding voltage increases the hardness and the ISO-V impact toughness of the weld metal. It shows that the reduction of the gap angle is the main cause for the obtained of a heat affected zone free from coarse grains, the reduction of the welding voltage, the increasing of the wire to groove face distance, and the grounding optimization also contribute for that. It was also concluded that the quality and the execution complexity level of a narrow gap welded joint are identical to a conventional gap welded joint. (author) [pt

  8. Ultrasonic testing and inspection of steel castings for use in elevated temperatures acc. to DIN 17245

    International Nuclear Information System (INIS)

    Christianus, D.; Fischer, K.H.

    1978-01-01

    Up to present, the non-destructive testing in german steel castings and delivery conditions has hardly been described. DIN 17245 was an exception for heat-resistant ferrite cast steel (July 1967 version) which for the first time contained data on maximum permissible defects in irradiation testing. The US (ultrasonic) method to find internal defects was named together with irradiation, the error limits however were also valid for this method according to the reference picture series of ASTM (American Society for Testing and Materials). It is clear to every practician that especially in the case of steel, due to the numerous possible defects and their unpredictable orientation, it is not always possible to determine the true type of defects based on reflection behaviour of an inhomogenity. In any case one cannot directly compare two physically different methods. If one considers foreign cast steel norms, then one finds somewhat more about non-destructive testing. The set standard measures mostly however take after the irradiation testing guidelines according to ASTM. A Westinghouse regulation, norm ASTM-A-609 and the ASME (Am. Soc. of Mech. Engineers) regulations for components of nuclear reactors are the exception. (orig.) [de

  9. Welding of Low Alloy Steel DIN 15Mo3 by MIG/MAG Spot

    OpenAIRE

    Nabeel K. Abid Al- Sahib

    2006-01-01

    ????? ????? ????? ????? ??????? ?????? ?? ????? ?????? ?????? ?????? ??????? ?????? ?????? (MIG/MAG spot) ???????? ??? ??????? ????? ?? ???? ???????? ????? ??? ???????? ?? ?????? ??????????? ??????? ???????? ????? ???? ??????? ??????? ????? ??? (DIN15Mo3) ?????? ?????? ?????? ?????? ?????? ?? ???? ???? ?????? ???????" ??? ?????? ??? ????. ????? ??????? ??????? ?????? ??? CO2 ????" ?? ??? ??????? ?? ???? ??????? ??????? ????? ?? ?????? ????? ?? ??? ???? ?? ????? (13%) ???? (4mm) ???? (2sec). ?...

  10. Monotonic and Cyclic Behavior of DIN 34CrNiMo6 Tempered Alloy Steel

    Directory of Open Access Journals (Sweden)

    Ricardo Branco

    2016-04-01

    Full Text Available This paper aims at studying the monotonic and cyclic plastic deformation behavior of DIN 34CrNiMo6 high strength steel. Monotonic and low-cycle fatigue tests are conducted in ambient air, at room temperature, using standard 8-mm diameter specimens. The former tests are carried out under position control with constant displacement rate. The latter are performed under fully-reversed strain-controlled conditions, using the single-step test method, with strain amplitudes lying between ±0.4% and ±2.0%. After the tests, the fracture surfaces are examined by scanning electron microscopy in order to characterize the surface morphologies and identify the main failure mechanisms. Regardless of the strain amplitude, a softening behavior was observed throughout the entire life. Total strain energy density, defined as the sum of both tensile elastic and plastic strain energies, was revealed to be an adequate fatigue damage parameter for short and long lives.

  11. Effects of neutron irradiation and fatigue on ductility of stainless steel DIN 1.4948

    International Nuclear Information System (INIS)

    Vries, M.I. de; Schaaf, B. van der; Staal, H.U.; Elen, J.D.

    1978-10-01

    Test specimens of stainless steel DIN 1.4948, which is similar to AISI type 304, have been irradiated at 723 K and 823 K up to fluences of 1.10 23 neutrons (n).m -2 and 5.10 24 n.m -2 (E > 0.1 MeV). These are representative conditions for the SNR-300 reactor vessel and inner components after 16 years of operation. High temperature (723 K to 1023 K) tensile tests at strain rates (depsilon/dt) from 10 -7 s -1 to 10 s -1 show a considerable decrease of tensile ductility. The extent depends on helium content, test temperature and strain rate. The atomic helium fractions of 3.10 -7 and 7.10 -6 result from the reactions of thermal neutrons with the 14 ppm boron, present in the steel. Helium embrittlement sets in at strain rates below 1 s -1 to 10 s -1 (the range of interest for Bethe-Tait accident analyses). A minimum total elongation value of 6% is shown at 923 K. The post-irradiation fatigue life is reduced by up to about 50% due to intergranular cracking. The combination of irradiation and fatigue causes a decrease of ductility after a smaller number of prior fatigue cycles than in the case of unirradiated material. (Auth.)

  12. Effects of neutron irradiation and fatigue on ductility of stainless steel DIN-1-4948

    International Nuclear Information System (INIS)

    de Vries, M.I.; van der Schaaf, B.; Staal, H.U.; Elen, J.D.

    1978-01-01

    Test specimens of stainless steel DIN 1.4948, which is similar to AISI Type 304, have been irradiated at 723 and 823 K up to fluences of 1*10$sup 23$ neutrons (n)*m$sup -2$ and 5*10$sup 24$ n*m$sup -2$ (E>0.1 MeV). These are representative conditions for the reactor vessel and inner components of the liquid metal fast breeder reactor SNR-300 after 16 years of operation. High-temperature (723 to 1023 K) tension tests at strain rates ($epsilon$) from 10$sup -7$ to 10 s$sup -1$ show a considerable decrease of tensile ductility. The extent depends on helium content, test temperature, and strain rate. The atomic helium fractions of 3*10$sup -7$ and 7*10$sup -6$ result from the reactions of thermal neutrons with the 14 ppm boron present in the steel. Helium embrittlement sets in at strain rates below 1 to 10 s$sup -1$ (the range of interest for Bethe-Tait accident analyses). A minimum total elongation value of 6 percent is shown at 923 K. The postirradiation fatigue life is reduced by up to about 50 percent due to intergranular cracking. The combination of irradiation and fatigue causes a decrease of ductility after a smaller number of prior fatigue cycles than in the case of unirradiated material. 8 refs

  13. Microstructure and thermomechanical pretreatment effects on creep behaviour of helium-implanted DIN 1.4970 austenitic stainless steel

    International Nuclear Information System (INIS)

    Matta, M.K.; Kesternich, W.

    1990-01-01

    Microstructure investigations were carried out on unimplanted and 150 at ppm helium implanted foil specimens of DIN 1.4970 austenitic stainless steel after various thermomechanical pretreatments. Creep test were also carried out for both helium-implanted and unimplanted specimens at 700degC and 800degC. The strength, ductility and rupture time are correalted with the dislocation and precipitate distributions. Helium embrittlement can be reduced in these experiments when dispersive TiC precipitate distributions are produced by proper pretreatments or allowed to form during creep test. (author). 14 refs., 11 figs

  14. The irradiation behaviour of the austenitic stainless steel DIN 1.4970

    International Nuclear Information System (INIS)

    Huebner, R.

    2000-06-01

    The irradiation behaviour of the austenitic stainless steel DIN 1.4970 (15% Cr, 15% Ni, 1,6% Mn, 1,5% Mo, 0,4 - 1% Si, 0,3 - 0,5% Ti) has been examined in the irradiation experiment PFR-M2. The samples have been irradiated as pressurised capsules in the prototype fast reactor at Dounreay, Scotland, at 420, 500 and 600 C with maximum doses of 106, 81 and 62 dpa NRT . The stress-free and the stress-induced swelling and the irradiation induced creep could be determined by the diameter and length measurements. After the irradiation the density and the mechanical properties have been determined. Additionally the microstructure was investigated with a transmission electron microscope (TEM). All four lots show the maximum amount of stress-free swelling at 420 C. At 600 C no swelling can be detected up to the maximum dose of 62 dpa NRT . The lot with the lowest Si-content exhibits the highest amount of swelling at 420 C as well as at 500 C. Increasing the Si-content from 0.4% to 1% increases at 420 C the incubation dose from 20 to 40 dpa NRT , but has no influence on the swelling rate. Increasing not only the Si-content but also reducing the Ti-content from 0.5 to 0.3% increases not only the incubation dose but also reduces the swelling rate. At 500 C both the increase of the Si-content and the reduction of the Ti-content result in a reduced swelling rate without any effect on the incubation dose. Therefore the best swelling resistance is achieved with a high Si-content and a low Ti-content, resulting in an understabilised condition. The TEM analysis of the microstructure reveals the mechanisms by which the minor elements influence swelling. Increasing the Si-content increases the vacancy mobility and reduces therefore the void nucleation rate. This yields the increased incubation dose. But this mechanism is only working if the silicon is dissolved in the matrix. Swelling starts when the amount of dissolved silicon is reduced under a certain amount. The lots with a high Si

  15. 'In-beam' simulation of high temperature helium embrittlement of DIN 1.4970 austenitic stainless steel

    International Nuclear Information System (INIS)

    Schroeder, H.; Batfalsky, P.

    1982-01-01

    This work describes a facility for high temperature creep rupture tests during homogeneous helium implantation. This 'in-beam' creep testing facility is used to simulate helium embrittlement effects which will be very important for first wall materials of future fusion reactors operated at high temperatures. First results for DIN 1.4970 austenitic stainless steel clearly demonstrate differences between samples 'in-beam' tested at 1073 K and those creep tested at the same temperature after room temperature helium implantation. The specimens ruptured 'in-beam' have much shorter lifetimes and lower ductility than the specimens tested after room temperature implantation. There are also differences in the microstructures, concerning helium bubble sizes and densities in matrix and grain boundaries. These microstructural differences may be a key for the understanding of the more severe helium embrittlement effects 'in-beam' as compared to creep tests performed after room temperature implantation. (orig.)

  16. Mean Stress Effect on the Axial Fatigue Strength of DIN 34CrNiMo6 Quenched and Tempered Steel

    Directory of Open Access Journals (Sweden)

    Luis Pallarés-Santasmartas

    2018-03-01

    Full Text Available The present study consists of a theoretical and experimental investigation of the effect of axial mean stresses on the high cycle fatigue behaviour of DIN 34CrNiMo6 high strength steel in quenched and tempered conditions. The axial S-N curves under 4 different stresses ratios were obtained. Experimental results show that increasing the value of the tension mean stresses gradually reduces the axial stress amplitude the material can withstand without failure. Moreover, the compressive mean stresses show a beneficial effect in terms of the axial fatigue strength, resulting in a non-symmetrical Haigh diagram. A historic review of the axial mean stress effect is presented, showing the shape of the Haigh diagrams for ductile metals and presenting the most-known empirical and physical theories. The results for this steel are compared with the physical theories of Findley based on the critical plane; the Froustey’s and Marin’s methods, based on energetic theories; and the Crossland invariants method based on the Gough’s theory of fatigue damage. Taking into account the experimental results, a physical fatigue function based on energetic considerations is proposed. Its application to the fatigue case with mean stresses can be interpreted in terms of a balance of elastic energies of distortion and volume change. Macro-analyses of specimen fracture appearance were conducted in order to obtain the fracture characteristics for different mean stress values.

  17. Explanations on nomenclature and number of material for steels in accordance with DIN norm - (Deutsch Industrie Norm)

    International Nuclear Information System (INIS)

    Barone, S.D.; Silva, T.C.V. da; Bittencourt, M.S.Q.

    1980-01-01

    The materials specified by DIN norm are identified by its nomenclature and corresponding DIN number. The characters (numbers and letters) aim to classify the material and provide indication on main alloy properties and elements. (M.C.K.) [pt

  18. The influence of thermomechanical treatment on the creep behaviour of DIN 1.4970 austenitic stainless steel at 973 K

    International Nuclear Information System (INIS)

    Zahra, A.A.A.; Schroeder, H.

    1981-04-01

    The creep-rupture behaviour of a Type DIN 1.4970 austenitic stainless steel has been investigated at 973 K (700 0 C) in a high vacuum for three conditions of thermomechanical treatment and a wide range of applied stresses. This type of steel is a candidate for use in the German SNR-300 Fast Breeder Reactor where it shall be used after a 13% cold-working treatment and subsequent aging at 1073 K (800 0 C) for 24 hours ( standard condition ). As an alternative, two other conditions were also investigated, namely aged at 1073 K (800 0 C) for 24 hours before the cold-working (condition 2) and cold worked only (condition 1). Because of various experimental efforts in this laboratory and elsewhere to study helium induced embrittlement effects in α-implanted foil specimens, all tests were performed using foil specimens of 105 μm thickness which were solution annealed at 1373 K (1100 0 C) before the above thermomechanical treatments were applied. The rupture lives and the minimum creep rates were found to be highly dependent on the applied stresses. The treatment of condition 1 material yielded a product as strong as the standard condition 3, while the condition 2 material was less creep resistant. Structural changes as well as fractography were followed using metallographic, transmission and scanning electron microscope techniques. Transgranular ductile fracture was clearly observed in all three conditions. TEM investigations showed that dispersive TiC precipitates were present in the matrix of condition 3 material before creep testing contrary to condition 1 and 2 material. In condition 1 the TiC dispersion was already found after short creep times, while no dispersive TiC precipitates were found in condition 2 material in every test condition. (orig.) [de

  19. Evaluation of the effect of the partial substituttion of vanadium and molybdenum by niobium in a tool steel DIN W. NR. 1.2714

    International Nuclear Information System (INIS)

    Isore, A.; Pereira, O.J.; Aleixo, C.

    1982-01-01

    A comparative study of the properties of a steel DIN W. Nr 1.2714 and those of two steels of the same type but with lower amounts of molybdenum and vanadium, higher amounts of silicon and chromium, and with the adition of niobium (0,08 and 0,17%), was carried out. In the three steels with niobium there are niobium carbides wich are aligned in the hot deformation direction, and do not dissolve at the normal austenitizing temperatures. In the steel with higher niobium content, these carbides affect the transverse toughness and its hot ductility (200 - 600 0 C), although sensibly improving the abrasion wear resistance. The results of the fracture toughness and Charpy test, suggest that the niobium carbides do not decrease the crack nucleation resistance. (Author) [pt

  20. Tensile properties of irradiated and fatigue exposed stainless steel DIN X 6 CrNi 1811 (similar to AISI type 304) plate and welded joints

    International Nuclear Information System (INIS)

    Vries, M.I. de; Schaaf, B. van der; Elen, J.D.

    1979-10-01

    Test specimens of plate metal and welded joints of stainless steel DIN 1.4948, which is similar to AISI type 304, have been irradiated at 723 K and 823 K up to fluences of 1.10 23 n.m -2 and 5.10 24 n.m -2 (E > 0.1 MeV). These are representative conditions for the SNR-300 reactor vessel and inner components after 16 years of operation. High-rate (depsilon/dt = 1 s -1 ) tensile tests were performed after fatigue exposure up to various fractions of fatigue life (D) ranging from 5% to 95% at the same temperatures as the nominal temperatures of the irradiation series

  1. Creep-rupture-strength and creep-behaviour of stainless steel X6CrNi 1811 (DIN 1.4948)

    International Nuclear Information System (INIS)

    Solano, R.R.; Rivas, M. de las; Schirra, M.; Seith, B.

    1976-10-01

    The steel X6CrNi 1811 (DIN 1.4948) that will be used as a structure material for the German fast breeder reactor SNR 300 was creep-tested in a temperature range of 550-650 0 C under base material condition as well as welded material condition. Tests are foreseen up to 30.000 hours with a continuous measuring of the elongation. The present report describes the test results up to about 5.000 hours. Taking into account the results of other programs carried out with the same material between 550 and 600 0 C at similar rupture times, were defined the stresses for the long term tests. The main point of this program ('Extrapolation Program') lies in the knowledge of the creep time and creep behaviour of the structure materials up to 3 x 10 4 h at high temperature in order to extrapolate up to 10 5 h for operating temperatures. (orig.) [de

  2. Creep-rupture-strength and creep-behaviour of stainless steel X6CrNi 1811 (DIN 1.4948)

    International Nuclear Information System (INIS)

    Solano, R.R.; Rivas, M. de las; Seith, B.; Schirra, M.

    1977-01-01

    The steel X6CrNi 1811 (DIN 1.4948) that will be used as a structure material for the german fast breder reactor SNR 300, was creep-tested in a temperature range of 550-650 deg C under base material condition as well as welded material condition. Tests are foreseen up to 30.000 hours with a continous measuring of the elongation. The test results up to about 4.000 hours is described. Taking into account the results of other programs carried out with the same material between 550 and 600 deg C at similar rupture time, were defined the stresses for the longterm test. The main point of this program (''Extrapolation Program'') lies in the knowledge of the creep-rupture-strength and creep behaviour of the structure materials up to 3.10 4 h at high temperature in order to extrapolate up to 10 5 h for reactor operating temperatures. (author) [es

  3. Creep-rupture-strength and creep-behaviour of stainless steel X6CrNi 1811(DIN 1.4948)

    International Nuclear Information System (INIS)

    Solano, R. R.; Schirra, M.; Rivas, M. de la; Seith, B.

    1977-01-01

    The steel X6CrNi 1811 (DIN 1.4948) that will be used as a structure material for the German Fast Breeder Reactor SNR 300 was creep-tested in a temperature range of 550-650 degree centigree under base material condition as well as welded material condition. Tests are foreseen up to 30.000 hours with a continuous measuring of the elongation. The present report describes the test results up to about 4-000 hours. Taking into account the results of other programs carried out with the same material between 550- and 600 degree centigree at similar rupture time, were defined the stresses for the long term tests. The main point of this program (Extrapolation Program) lies in the knowledge of the creep-rupture-strength and creep behaviour of the structure materials up to 3.10 4 h at high temperature in order to extrapolate up to 10 5 h. for reactor operating temperatures. (Author) 14 refs

  4. Creep-rupture-tests on thestainless steel X6 CrNi1811 (DIN 1.4948) in the frame of the ''Extrapolation-Program'' Pt. 2

    International Nuclear Information System (INIS)

    Solano, R.R.; Barroso, S.; Rivas, M. de las; Schirra, M.; Seith, B.

    1979-01-01

    The austenitic stainless steel X6 CrNi 1811 (DIN 1.4948) that is used as a structure material for the German Fast Breeder Reactor SNR 300 was creep tested in a temperature range of 550-650 deg under base material condition as well as welded material condition. The main point of this program (''Extrapolation-Program'') lies in the knowledge of the cree-rupture-strength and creep-behaviour up to 3X10 - 4 hours at higher temperatures in order to extrapolate up to (>=)10 5 hours for operating temperatures. In order to study the stress dependency of the minimum creep rate additional tests were carried out over temperature range 550 deg - 750 deg C. The present report describes the state in the running program with test-time up to 35.000 hours. Besides the cree-rupture behaviour it is possible to make a distinct quantitative statement for the creep-behaviour and ductility. Extensive metallographic examinations show the fracture behaviour and changes in structure. (author)

  5. Comparison of the corrosion resistance of DIN W. Nr. 1.4970 (15%Cr-15%Ni-1.2%Mo-Ti and ASTM F-138 (17%Cr-13%Ni-2.5%Mo austenitic stainless steels for biomedical applications

    Directory of Open Access Journals (Sweden)

    Maysa Terada

    2006-09-01

    Full Text Available The resistance to localised corrosion of the full austenitic 15%Cr-15%Ni-1.2%Mo titanium stabilized stainless steel (DIN W. Nr. 1.4970 was investigated by electrochemical methods including electrochemical impedance spectroscopy (EIS, potentiodynamic polarization and potentiostatic polarization measurements in a phosphate-buffered solution (PBS. The low carbon and non-stabilized austenitic stainless steel, AISI 316L (ASTM F-138, widely used for surgical implants, was also tested for comparison. The tests were conducted at room temperature after a stable potential had been reached. After the electrochemical measurements, the surfaces of the specimens were observed using SEM to evaluate the presence of pits. Potentiodynamic polarization results showed that both steels are prone to localized corrosion. Larger pits were found on the surface of AISI 316L specimens after the electrochemical tests. EIS response has indicated the duplex structure of the passive oxides. The results showed that the electrochemical behaviour of the DIN W. Nr. 1.4970 is better than of AISI 316L steel. Therefore, their application as an implant material may be considered.

  6. Isothermal steam oxidation of the ferritic 11% Cr steel (DIN No. 1.4914) at 900 to 13000C

    International Nuclear Information System (INIS)

    Zurek, Z.

    1982-11-01

    The steam oxidation of ferritic 11% Cr steel tube and sheet samples at 900 to 1300 0 C has been studied gravimetrically, metallographically, by X-ray diffraction and in detail by electron probe microanalysis. The reaction rate could be described by parabolic kinetics of mass increase. During the oxidation a three-layer scale was formed on the surface. The inner layer was composed of iron-chromium spinel, the intermediate layer consisted of a mixture wustite and magnetite, the very thin outer layer was composed of magnetite. Within the inner scale layer small metallic particles enriched of nickel could be observed. The scale cohesion was generally poor for tube as well as for sheet material and was improving with oxidation time and temperature. After oxidation Pt-markers indicated the growth of inner and outer layer in relation to the initial metal surface. The sheet material specimens exposed at 1000-1100 0 C had blisters on their surfaces. A swelling of about 12-15% was measured for the oxidized tubing. Isotherme Dampf-Oxidation des ferritischen 11% Cr-Stahls (Werkstoff Nr. 1.4914) bei 900 - 1300 0 C. (orig.) [de

  7. Post-irradiation creep properties of four plates and two forgings DIN 1.4948 steel from the SNR-300 permanent primary structures

    International Nuclear Information System (INIS)

    Schaaf, B. van der.

    1987-01-01

    The safety authorities, involved in the licensing procedure of the SNR-300, have required the determination of the irradiation effect on the heat-to-heat variation of tensile and creep properties of Werkst. No. DIN 1.4948 austenitic stainless steel. These data are lacking in the present codes and they are necessary for the design and safety considerations of the permanent structures. Results are presented of about 200 tests on irradiated and unirradiated material of 6 heats used in the production of the SNR-300 permanent structures. After irradiation in the HFR-Petten to neutron fluences relevant for the SNR-300 service conditions post-irradiation tensile and creep tests (up to 10,000 hrs rupture time) were performed in the temperature range 723 K to 923 K. All heats are embrittled by irradiation resulting in reduction of rupture times, creep strength and ultimate tensile strength. The considerable reduction is attributed to helium enhanced intergranular creep crack growth, which reduces the ductility and strength, but does not affect the creep rate. The variation of tensile and creep properties is large and independent of irradiation. The minimum derived creep strength in irradiated condition drops below the values expected in the ASME Code and VdTuV Blatt. In design and safety analyses the irradiation effect on creep properties must be accounted for with an appropriate reduction factor. The predictions given, have to be verified with long-term creep tests and parts of the SNR surveillance programme. 172 figs.; 17 refs.; 58 tables

  8. Find din stemme

    DEFF Research Database (Denmark)

    Hansen, Jette Barnholdt

    2010-01-01

    Anmeldelse af Dorte Kock og Lene Kleinschmidts: Find din stemme. En brugsbog.Hans Reitzels Forlag 2010.......Anmeldelse af Dorte Kock og Lene Kleinschmidts: Find din stemme. En brugsbog.Hans Reitzels Forlag 2010....

  9. Electrochemical studies of the corrosion behavior of the fine-grained structural steel DIN W.Nr. 1.0566 between 55 and 90deg C in simulated salt brine repository environments

    International Nuclear Information System (INIS)

    Farvaque-Bera, A.M.; Leistikow, S.

    1991-05-01

    The electrochemical corrosion of the fine-grained structural steel DIN W. Nr. 1.0566 was tested between 55 and 90deg C in three simulated salt brines of similar compositions as analyzed for the Gorleben repository environment. As test parameters the temperature, the salt brine composition, the stirring velocity and the oxygen content as well as the state of the steel surface were varied. As experimental results are presented: (1) the free corrosion potentials of the steel in three brines, (2) Tafel plots of current densities as measured potentiodynamically in the anodic and cathodic vicinity of the corrosion potentials and being representative for the rate of metal dissolution, (3) the surface morphology of the corroded specimens. As mechanisms - in the absence of oxygen - the cathodic reduction of water and the anodic dissolution of iron are considered to prevail the corrosion reaction. It is shown that the applied electrochemical techniques are able to determine within an accelerated procedure the most important corrosion parameters in respect to their influence on rate of metal dissolution and morphology of corrosion attack. (orig.) [de

  10. sajad hussain din

    Indian Academy of Sciences (India)

    Home; Journals; Bulletin of Materials Science. SAJAD HUSSAIN DIN. Articles written in Bulletin of Materials Science. Volume 39 Issue 7 December 2016 pp 1753-1761. Influence of boron doping on mechanical and tribological properties in multilayer CVD-diamond coating systems · SAJAD HUSSAIN DIN M A SHAH N A ...

  11. Creep-rupture-strength and creep-behaviour of stainless steel X6CrNi 1811(DIN 1.4948); Comportamiento a la fluencia lenta del acero X6CrNi 1811 (1.4948)

    Energy Technology Data Exchange (ETDEWEB)

    Solano, R R; Schirra, M; Rivas, M de la; Seith, B

    1977-07-01

    The steel X6CrNi 1811 (DIN 1.4948) that will be used as a structure material for the German Fast Breeder Reactor SNR 300 was creep-tested in a temperature range of 550-650 degree centigree under base material condition as well as welded material condition. Tests are foreseen up to 30.000 hours with a continuous measuring of the elongation. The present report describes the test results up to about 4-000 hours. Taking into account the results of other programs carried out with the same material between 550- and 600 degree centigree at similar rupture time, were defined the stresses for the long term tests. The main point of this program (Extrapolation Program) lies in the knowledge of the creep-rupture-strength and creep behaviour of the structure materials up to 3.10{sup 4}h at high temperature in order to extrapolate up to 10{sup 5} h. for reactor operating temperatures. (Author) 14 refs.

  12. Steel

    International Nuclear Information System (INIS)

    Zorev, N.N.; Astafiev, A.A.; Loboda, A.S.; Savukov, V.P.; Runov, A.E.; Belov, V.A.; Sobolev, J.V.; Sobolev, V.V.; Pavlov, N.M.; Paton, B.E.

    1977-01-01

    Steels also containing Al, N and arsenic, are suitable for the construction of large components for high-power nuclear reactors due to their good mechanical properties such as good through-hardening, sufficiently low brittleness conversion temperature and slight displacement of the latter with neutron irradiation. Defined steels and their properties are described. (IHOE) [de

  13. Kommunikation skaber din organisation

    DEFF Research Database (Denmark)

    Hansen, Heidi

    KOMMUNIKATION skaber din ORGANISATION tager udgangspunkt i en narrativ tilgang til kommunikation, hvor organisationen skabes i mødet mellem ledere, medarbejdere, organisation og omverden. Historier hjælper os med at skabe mening, og er derfor vigtige både som et udviklingsværktøj i organisationen...

  14. New heating load calculation in practice. DIN 4701 vs. DIN EN 12831; Neue Heizlastberechnung in der Praxis. DIN 4701 vs. DIN EN 12831

    Energy Technology Data Exchange (ETDEWEB)

    Kroeber, C [Rehau-Akademie Bau, Erlangen (Germany)

    2004-09-15

    DIN EN 12831 is the most controversial technical standard that ever was. The contribution shows the changes from DIN 4701 and their consequences on heating systems and heating grids. (orig.) [German] Wie keine andere Norm, die in den letzten Jahren im Hinblick auf die europaeische Harmonisierung eingefuehrt wurde, sorgt die Heizlastberechnung nach DIN EN 12831 fuer reichlich Gespraechsstoff. In folgendem Beitrag wird beschrieben, welche Veraenderungen im Vergleich zur Waermebedarfsberechnung nach DIN 4701 auftreten und wie sie sich auf die Heizsysteme und Waermeerzeugungsanlagen auswirken. (orig.)

  15. Mutaciones dinámicas

    Directory of Open Access Journals (Sweden)

    Cesar A. Parra

    1994-10-01

    Full Text Available EI descubrimiento de repeticiones amplificadas de trinucleótidos variables en número, en pacientes con distrofia miotónica, síndrome de X-frágil, corea de Huntington y enfermedad de Kennedy, al igual que alteraciones en dinucleótidos del DNA microsatélite en pacientes con carcinoma proximal de colon, ha dado origen al concepto de mutaciones dinámicas. Esto representa una nueva avenida en teoría genética contemporánea que explica fenómenos como lo anticipación y la paradoja de Sherman que se salen del patrón mendeliano clásico.

  16. Cathode-sputtered Ti-Zr-N-C-O base hard coatings and stability of said coatings on hard metals and working steels. Kathodenzerstaeubte Hartstoffschichten auf Basis Ti-Zr-N-C-O und deren Stabilitaet auf Hartmetall und Gebrauchsstaehlen

    Energy Technology Data Exchange (ETDEWEB)

    Boehmer, M.

    1986-02-26

    This paper deals with the examination of the metallurgical and thermal stability of the resistant material layers of titanium in connection with the substrate material influence. As substrate material were chosen: hard metal (81% WC, 12% TiC+TaC, 7% Co), high speed steel (DIN 1.3343), austenitic nickel chromium steel (X5 CrNi 18 9) and unalloyed tool steel (DIN 1.1545). The hard materials of titanium were deposited by means of cathode evaporation.

  17. Aircraft Steels

    Science.gov (United States)

    2009-02-19

    component usage. PH 13-8Mo is a precipitation-hardenable martensitic stainless steel combining excellent corrosion resistance with strength. Custom 465 is...a martensitic , age-hardenable stainless steel capable of about 1,724 MPa (250 ksi) UTS when peak-aged (H900 condition). Especially, this steel can...NOTES 14. ABSTRACT Five high strength steels (4340, 300M, AerMet 100, Ferrium S53, and Hy-Tuf) and four stainless steels (High Nitrogen, 13

  18. Ensayo sobre endurecimiento de adhesivos estructurales sometidos a cargas dinámicas

    Directory of Open Access Journals (Sweden)

    Recuero, A.

    2004-04-01

    Full Text Available Carbon fibre reinforced polymers are increasingly replacing the steel reinforcing systems in the repair and strengthening of concrete structures thanks to their high strength/weight and stiffness/weight ratios, corrosion resistance, lightweight, and ease of handling and application. This paper presents a study on the behaviour of bridge concrete beams strengthened with CFRP sheets when the strengthening is made when traffic is acting so that the structure is subjected to dynamic loads while the adhesive is still fresh. No reduction in the effectiveness of the strengthening was observed in the tests.

    Los polímeros reforzados con fibras de carbono se están utilizando cada vez más para el refuerzo de estructuras de hormigón, reemplazando a los sistemas tradicionales de refuerzo con acero. Esto es debido a sus altas resistencia y rigidez específicas, resistencia a la corrosión, ligereza y facilidad de manejo y puesta en obra. Este artículo presenta un estudio sobre el comportamiento de vigas de puentes reforzadas con bandas de CFRP mientras se mantiene el puente en servicio de manera que la estructura está sometida a cargas dinámicas con el adhesivo fresco. En los ensayos realizados se ha observado que las cargas dinámicas no afectan a la efectividad del refuerzo.

  19. Steel making

    CERN Document Server

    Chakrabarti, A K

    2014-01-01

    "Steel Making" is designed to give students a strong grounding in the theory and state-of-the-art practice of production of steels. This book is primarily focused to meet the needs of undergraduate metallurgical students and candidates for associate membership examinations of professional bodies (AMIIM, AMIE). Besides, for all engineering professionals working in steel plants who need to understand the basic principles of steel making, the text provides a sound introduction to the subject.Beginning with a brief introduction to the historical perspective and current status of steel making together with the reasons for obsolescence of Bessemer converter and open hearth processes, the book moves on to: elaborate the physiochemical principles involved in steel making; explain the operational principles and practices of the modern processes of primary steel making (LD converter, Q-BOP process, and electric furnace process); provide a summary of the developments in secondary refining of steels; discuss principles a...

  20. Não-linearidades: da dinâmica do simples à dinâmica do complexo

    Directory of Open Access Journals (Sweden)

    José Roberto Castilho Piqueira

    1994-01-01

    Full Text Available Foram apresentados alguns conceitos relativos à utilização da Teoria dos Sistemas Dinâmicos em problemas de sistemas complexos. A apresentação destes conceitos centra-se no estabelecimento de duas dinâmicas: uma de curto termo e outra de longo termo, relacionando-as com os processos de organização dos sistemas.

  1. Dinámica de objetos transplutonianos: resultados preliminares

    Science.gov (United States)

    Fernández, S.; Brizuela, H.; Roig, F.; Varela, O.

    Se presentan los resultados de una integración numérica de las ecuaciones de movimiento para objetos transplutonianos. Se han calculado los tiempos de Lyapunov para esos objetos y se analiza el comportamiento dinámico de los mismos.

  2. Radiographic sensitivity evaluated by IQI DIN in double wall radiography and simple view

    International Nuclear Information System (INIS)

    Oliveira, C.S. de; Santos Filho, M. dos

    1983-01-01

    A comparison between the sensitivity of IQI-DIN put at the film side with the sensitivity of the IQI-DIN put at the source side, only for the double wall-simple view technique (DW-SW) is presented. An analysis about the requirements of radiographyic sensitivity in accordance to DIN rule is done. (E.G.) [pt

  3. Entrenamiento integrado. Principios dinámicos y aplicaciones

    Directory of Open Access Journals (Sweden)

    Natàlia Balagué Serre

    2014-06-01

    Full Text Available El interés por el entrenamiento integrado es creciente y para aumentar su eficacia resulta clave conocer cómo se produce el proceso de integración en los sistemas vivos. Por lo general, se suele asumir que el tipo de integración que se da en el organismo y entre los componentes del entrenamiento es sumatoria y lineal; es decir, está caracterizada por relaciones proporcionales, fijas e invariables en el tiempo, como las que se dan en cualquier artilugio técnico. Este modelo de integración, basado en la cibernética clásica, contrasta con el modelo de integración dinámica y no lineal, asentado en la neurociencia, la teoría de sistemas dinámicos no lineales, y la dinámica ecológica. Algunos principios de la integración dinámica y no lineal como la autoorganización, su carácter no proporcional y no consciente y su integración contextual en diferentes escalas acostumbran a ignorarse sistemáticamente en las metodologías de entrenamiento más habituales. El objetivo de este trabajo es presentar los principios dinámicos del entrenamiento integrado para promover la emergencia de metodologías más eficaces y eficientes a la vez que más respetuosas con los deportistas y los equipos.

  4. Tool steels

    DEFF Research Database (Denmark)

    Højerslev, C.

    2001-01-01

    On designing a tool steel, its composition and heat treatment parameters are chosen to provide a hardened and tempered martensitic matrix in which carbides are evenly distributed. In this condition the matrix has an optimum combination of hardness andtoughness, the primary carbides provide...... resistance against abrasive wear and secondary carbides (if any) increase the resistance against plastic deformation. Tool steels are alloyed with carbide forming elements (Typically: vanadium, tungsten, molybdenumand chromium) furthermore some steel types contains cobalt. Addition of alloying elements...... serves primarily two purpose (i) to improve the hardenabillity and (ii) to provide harder and thermally more stable carbides than cementite. Assuming proper heattreatment, the properties of a tool steel depends on the which alloying elements are added and their respective concentrations....

  5. On the dimensioning of steel construction considering revision of German standards

    International Nuclear Information System (INIS)

    Lindhorst, L.; Schaudinn, L.; Milleder, J.

    2005-01-01

    Different procedures for dimensioning of structural steelwork are investigated in this paper. In the non-nuclear area, there has been made a change in the design concept for structural steelwork of surface constructions in Germany and the deterministic design concept of German DIN 18800 (03/81) [1] has been replaced by the semi-probabilistic design concept of DIN 18800 (11/90) [2]. Design codes established in nuclear safety standards for steelwork in German nuclear facilities are considered in the paper. Recent revisions of German nuclear safety standards and specifications are discussed with respect to regulations concerning design codes. The change in design concept for structural steelwork (non-nuclear) has not been adopted in recent revisions of nuclear safety standards and specifications for steelwork of components with importance to safety. The deterministic concept of DIN 18800 (03/81) [1] is compared with the semi-probabilistic concept of DIN 18800 (11/90) [2]. Differences between the standards [1] and [2] are investigated using an example of a steel construction. Results for dimensioning according to DIN 18800 (03/81) [1] are compared to those for dimensioning according to DIN 18800 (11/90) [2] putting the main emphasis on stress analysis and building structure interaction loads. (authors)

  6. [Automated measurement of distance vision based on the DIN strategy].

    Science.gov (United States)

    Effert, R; Steinmetz, H; Jansen, W; Rau, G; Reim, M

    1989-07-01

    A method for automated measurement of far vision is described which meets the test requirements laid down in the new DIN standards. The subject sits 5 m from a high-resolution monitor on which either Landolt rings or Snellen's types are generated by a computer. By moving a joystick the subject indicates to the computer whether he can see the critical detail (e.g., the direction of opening of the Landolt ring). Depending on the subject's input and the course of the test so far, the computer generates the next test symbol until the threshold criterion is reached. The sequence of presentation of the symbols and the threshold criterion are also in accordance with the DIN standard. Initial measurements of far vision using this automated system produced similar results to those obtained by conventional methods.

  7. INFLUENCE OF HEAT TREATMENT ON THE MICROSTRUCTURE AND TOUGHNESS OF BÖHLER M333 ISOPLAST STEEL

    OpenAIRE

    Perko, J.; Redl, C.; Leitner, H.

    2009-01-01

    In this work the through hardenability and the influence of the heat treatment parameters (austenitizingtemperature, cooling parameter ? and tempering temperature) on the microstructure and the achievabletoughness level of Böhler M333 ISOPLAST are investigated. The results are compared to the standardizedtool steel grade DIN 1.2083. The investigations showed that the cooling parameter ? has a strong influenceon the impact toughness of M333 ISOPLAST plastic mould steel. The toughness is reduce...

  8. Steel alloys

    International Nuclear Information System (INIS)

    Bloom, E.E.; Stiegler, J.O.; Rowcliffe, A.F.; Leitnaker, J.M.

    1977-01-01

    The invention deals with a fuel element for fast breeder reactors. It consits essentially of a uranium oxide, nitride, or carbide or a mixture of these fuels with a plutonium or thorium oxide, nitride, or carbide. The fuel elements are coated with an austenitic stainless steel alloy. Inside the fuel elements, vacancies or small cavities are produced by neutron effects which causes the steel coating to swell. According to the invention, swelling is prevented by a modification of type 304, 316, 321, or 12 K 72HV commercial steels. They consist mainly of Fe, Cr, and Ni in a ratio determined by a temary diagram. They may also contain 1.8 to 2.3% by weight of Mo and a fraction of Si (0.7 to 2% by weight) and Ti(0.10 to 0.5% by weight) to prevent cavity formation. They are structurally modified by cold working. (IHOE) [de

  9. Escherichia coli DinB inhibits replication fork progression without significantly inducing the SOS response.

    Science.gov (United States)

    Mori, Tetsuya; Nakamura, Tatsuro; Okazaki, Naoto; Furukohri, Asako; Maki, Hisaji; Akiyama, Masahiro Tatsumi

    2012-01-01

    The SOS response is readily triggered by replication fork stalling caused by DNA damage or a dysfunctional replicative apparatus in Escherichia coli cells. E. coli dinB encodes DinB DNA polymerase and its expression is upregulated during the SOS response. DinB catalyzes translesion DNA synthesis in place of a replicative DNA polymerase III that is stalled at a DNA lesion. We showed previously that DNA replication was suppressed without exogenous DNA damage in cells overproducing DinB. In this report, we confirm that this was due to a dose-dependent inhibition of ongoing replication forks by DinB. Interestingly, the DinB-overproducing cells did not significantly induce the SOS response even though DNA replication was perturbed. RecA protein is activated by forming a nucleoprotein filament with single-stranded DNA, which leads to the onset of the SOS response. In the DinB-overproducing cells, RecA was not activated to induce the SOS response. However, the SOS response was observed after heat-inducible activation in strain recA441 (encoding a temperature-sensitive RecA) and after replication blockage in strain dnaE486 (encoding a temperature-sensitive catalytic subunit of the replicative DNA polymerase III) at a non-permissive temperature when DinB was overproduced in these cells. Furthermore, since catalytically inactive DinB could avoid the SOS response to a DinB-promoted fork block, it is unlikely that overproduced DinB takes control of primer extension and thus limits single-stranded DNA. These observations suggest that DinB possesses a feature that suppresses DNA replication but does not abolish the cell's capacity to induce the SOS response. We conclude that DinB impedes replication fork progression in a way that does not activate RecA, in contrast to obstructive DNA lesions and dysfunctional replication machinery.

  10. DIN VIAŢĂ SI DIN CĂRŢI O LUCRARE CE NE PUNE PE GÂNDURI

    Directory of Open Access Journals (Sweden)

    Coriolan PĂUNESCU

    2008-06-01

    Full Text Available A apărut, la Iasi, o carte cu valoare de unicat; este vorba de „Agriculturaîn proverbe si cugetări” (Ed. Vasiliana ’98, Iasi, 2008, semnată de reputatul Prof.univ. dr. Nicolae VASILESCU si ing. Aglaia VASILESCU, oameni care au slujitdecenii de-a rândul învăţământul agronomic românesc. De aici, desigur si respectulautorilor pentru agricultură si, mai ales, pentru oamenii satului, dedicaţi, înîntregime, acestei nobile îndeletniciri (dar si creaţiei lor spirituale, în care, nu o dată,se reflectă munca si viaţa de fiecare zi. Însă, această carte se vrea mai mult decâtspune, deoarece cuprinde si reflecţii ale oamenilor culţi, despre agricultură, întrecare scriitori, filosofi, muzicieni, savanţi ai domeniului agronomic, călătoriînvederaţi, politicieni, istorici, oameni ai catedrelor, revoluţionari de renume,evident, din lume si din ţară, din Antichitate si până astăzi.

  11. Hegelian Steel

    DEFF Research Database (Denmark)

    Kjær, Poul F.

    2015-01-01

    Even in our globalized world the notion of national economies remain incredibly strong, just as a considerable part of the literature on transnational governance and globalization continue to rely on a zero-sum perspective concerning the relationship between the national and the transnational. De...... of the European steel industry....

  12. Adam Smith y Sistemas Dinámicos

    Directory of Open Access Journals (Sweden)

    Osvaldo Acuña

    2008-01-01

    Full Text Available Presentamos un sistema dinámico sencillo con dos ecuaciones diferenciales, una representa la trayectoria del precio y la otra la de la cantidad de un bien en una economía. Nuestro modelo se basa sobre todo en la teoría clásica de precios expuesta por Adam Smith en La Riqueza de las Naciones. Al final del trabajo, se presenta, a modo de ejemplo, un estudio para el caso del ganado vacuno en la economía mundial.

  13. Doctor Shoja-ad-Din Sheikholeslamzadeh and his Achievements.

    Science.gov (United States)

    Afshar, Ahmadreza; Ziaei, Majid Eyvaz; Ahmadi, Aziz

    2015-01-01

    Doctor Shoja-ad-Din Sheikholeslamzadeh (also known as Dr. Sheikh) (1931-2014) was an outstanding orthopedic surgeon. He is credited for the establishment of the Iranian Association of Rehabilitation, Shafa Yahyaian Hospital as an Orthopedic and Rehabilitation Center, the Social Welfare Organization, Iran's emergency dispatch center (115) and many other major projects that led to the upgrading of health care services in Iran. He also served as the Minister of Social Welfare and Minister of Health and Welfare before the Islamic revolution. The history of modern health care management and modern orthopedic surgery in Iran are indebted to the great leadership and executive abilities of Dr. Sheikh.

  14. STUDIUL COMPLEX Al ULEIULUI VOLATIL DIN SPECIA PEROVSCHIA ATRIPLICIFOLIA BENTH.

    Directory of Open Access Journals (Sweden)

    Maricica COLŢUN

    2017-07-01

    Full Text Available În lucrare sunt prezentate rezultatele unui studiu vast privind biologia, compoziția chimică, fitochimia cantitativă și calitativă a uleiului volatil din specia Perovskia atriplicifolia, care se comportă ca plantă perenă, erbacee din familia Lamiaceae. În R. Moldova nu este cercetată ca plantă aromatică şi medicinală. Are o plasticitate ecologică mare, nu are cerinţe deosebite faţă de factorii climaterici. Se utilizează pentru proprietăţile sale febrifuge, în medicină – pentru scăderea febrei, deține proprietăți culinare dar şi decorative ori de purificare a aerului.THE COMPLEX STUDY OF THE ESSENTIAL OIL OF THE SPECIESPEROVSCHIA ATRIPLICIFOLIA BENTH.The paper presents the results of a vast study on the biology, chemical composition and qualitative phytochemistry of the essential oil of the species Perovskia atriplicifolia, which behaves like a perennial, herbaceous plant in the Lamiaceae family. In theRepublic ofMoldova, it has not been investigated as an aromatic and medicinal plant. It has a high ecological plasticity and no special requirements to climatic factors. It has febrifuge properties and is used in medicine to reduce fever. Besides, this plant is used for culinary, ornamental purposes and for air purification.

  15. origen e impactos de dinópolis

    Directory of Open Access Journals (Sweden)

    Raúl Lardiés Bosque

    2005-01-01

    Full Text Available El parque temático de Dinópolis se ha convertido en uno de los principales atractivos de la provincia de Teruel. Desde que el parque empezó a funcionar en junio de 2001, ya se han empezado a detectar algunos cambios de tipo socioeconómico, no sólo por el aumento del número de visitantes y turistas que llegan a la ciudad de Teruel, sino también por los impactos indirectos que esa afluencia genera en el sector turístico y comercial. En este artículo se analiza la puesta en marcha del proyecto y sus orígenes, así como la influencia socioeconómica que está teniendo a escala local. El enfoque que se ha adoptado es el de considerar a Dinópolis como una herramienta/estrategia de desarrollo local, puesto que se está convertiendo en un reclamo turístico y de visitantes para la ciudad, y porque todo ello genera impactos indirectos importantes en diversos sectores y ramas económicas.

  16. NCRP Report No.151 versus Norm DIN 6847-2; NCRP Report No. 151 vs Norma DIN 6847-2

    Energy Technology Data Exchange (ETDEWEB)

    Sanchez Jimenez, J.; Rivas Ballarin, M. A.

    2008-07-01

    The National Council on Radiation protection and Measurements (NCRP) has recently published its Report No. 151, which presents recommendations and technical information on the design of structural shielding for megavoltage X and gamma-ray radiotherapy facilities. The calculations method introduced by this Report covers aspects like IMRT and other special techniques, as well as the design of structural details like doors, mazes and ducts, or the calculations of skyshine and ground shine radiation. In this work the necessary shielding for a Siemens Oncor treatment unit has been calculated, following NCRP Report No. 151 and DIN 6847-2 standard. In both cases the same isocenter workload W, use factor U, occupancy factor T and shielding design goals P, for workers and public members, are used. The results obtained with DIN 6847 are similar to the ones obtained with this Report, though there are some differences when considering the in-any-one-hour time averaged dose-equivalent rate in low occupancy factor areas, or where scattered radiation reaches the barrier under a small angle. (Author) 9 refs.

  17. Protection of proprietary rights of DIN standards in connection with statutory and administrative provisions

    International Nuclear Information System (INIS)

    Katzenberger, P.

    1985-01-01

    On the basis of contracts entered with the German Institute of Standardization (DIN), the state bodies and authorities tend to refer to Din standards in many ways when issuing statutory or administrative provisions. Some Din standards are also printed in official publications- with or without Din's prior consent. Such common practice leads to the question whether the Din standards which on pinciple meet the general requirements made on the protection of proprietary rights are losing this protection by the fact that official publications are exempt from the protection of proprietary rights (Art.5 UrhG). The author points out that the thorough analysis of the legal position in terms of interests, proprietary rights and constitution indicated that this is not, in principle, the case. (orig.) [de

  18. Irradiation creep of the martensitic steel no. 1.4914 between 400 deg C and 600 deg C (Mol 5B)

    International Nuclear Information System (INIS)

    Herschbach, K.; Doser, W.

    1983-01-01

    The irradiation induced creep of the martensitic steel DIN No. 1.4914 was investigated in the temperature range from 400 to 600 deg C for stresses up to 200 Mpa using the Mol 5B irradiation rig. The results point to a behavior quite different from that observed in the austenitic steels as will be discussed in detail. The creep is thermally activated and non-linearly dependent upon the applied stress. (author)

  19. Effect of heat treatment, with and without mechanical work, on the tensile and creep behaviour at 6000C of austenitic stainless steel stabilised with titanium

    International Nuclear Information System (INIS)

    Padilha, A.F.

    1983-01-01

    The effect of various heat treatments, with and without mechanical work, on the microstructure and the tensile and creep behaviour at 600 0 C of the titanium stabilised austenitic stainless steel DIN 1.4970, as well as the effects of aging temperature, pre-strain and small boron additions on the creep behaviour of these steels are discussed. The most probable mechanism is suggested. (Author) [pt

  20. Doctor Shoja-ad-Din Sheikholeslamzadeh and his Achievements

    Directory of Open Access Journals (Sweden)

    Ahmadreza Afshar

    2015-01-01

    Full Text Available Doctor Shoja-ad-Din Sheikholeslamzadeh (also known as Dr. Sheikh (1931-2014 was an outstanding orthopedic surgeon. He is credited for the establishment of the Iranian Association of Rehabilitation, Shafa Yahyaian Hospital as an Orthopedic and Rehabilitation Center, the Social Welfare Organization, Iran’s emergency dispatch center (115 and many other major projects that led to the upgrading of health care services in Iran. He also served as the Minister of Social Welfare and Minister of Health and Welfare before the Islamic revolution. The history of modern health care management and modern orthopedic surgery in Iran are indebted to the great leadership and executive abilities of Dr. Sheikh

  1. Dinámica y control poblacional de insectos

    OpenAIRE

    Anabel Albornoz, Teresita

    2012-01-01

    Anais do I Encontro de Iniciação Científica e de Extensão da Unila - Sessão de Ciências Biológicas. Dia 05/06/12 - 08h00 às 12h00, Unila-Centro - Sala 14 - 3o Piso El presente proyecto de investigación trata de la dinámica poblacional de insectos, la relación com depre - dadores y la interacción de ambos con plantaciones de frutas. El objetivo es buscar el realismo en la fór - mula predador-presa, en relación al tiempo y al espacio, según Lotka-Volterra. Esto significa, encontrar ...

  2. La caja negra de la dinámica empresarial

    Directory of Open Access Journals (Sweden)

    María Callejón

    2009-01-01

    Full Text Available Este artículo intenta aportar conocimientos sobre la contribución a la política industrial de la investigación en dinámica empresarial. Los programas de fomento a la creación de empresas se han generalizado aunque se desconoce cuál es el ritmo óptimo de creación y destrucción empresarial. El análisis económico destaca la heterogeneidad empresarial como característica dominante en la dinámica industrial. La profundización en el conocimiento de los tipos de emprendedores, su comportamiento, y su contribución diferencial a la innovación y el crecimiento permitirá ver en la "caja negra" y diseñar programas públicos adecuados. El análisis empírico realizado encuentra que la naturaleza económica del autoempleo es muy diferente de las empresas con empleados. Los programas públicos deberían priorizar entrantes con capacidad de sobrevivir y no maximizar la entrada indiscriminadamente. La supervivencia de las nuevas empresas se encuentra positivamente relacionada con su tamaño al nacer. La innovación y la inversión mejoran la supervivencia de las nuevas empresas manufactureras. La inversión en I+D aumenta el riesgo de las nuevas empresas, aunque mejore la competitividad de las empresas establecidas.

  3. La caja negra de la dinámica empresarial

    Directory of Open Access Journals (Sweden)

    María Callejón

    2009-10-01

    Full Text Available Este artículo intenta aportar conocimientos sobre la contribución a la política industrial de la investigación en dinámica empresarial. Los programas de fomento a la creación de empresas se han generalizado aunque se desconoce cuál es el ritmo óptimo de creación y destrucción empresarial. El análisis económico destaca la heterogeneidad empresarial como característica dominante en la dinámica industrial. La profundización en el conocimiento de los tipos de emprendedores, su comportamiento, y su contribución diferencial a la innovación y el crecimiento permitirá ver en la “caja negra” y diseñar programas públicos adecuados. El análisis empírico realizado encuentra que la naturaleza económica del autoempleo es muy diferente de las empresas con empleados. Los programas públicos deberían priorizar entrantes con capacidad de sobrevivir y no maximizar la entrada indiscriminadamente. La supervivencia de las nuevas empresas se encuentra positivamente relacionada con su tamaño al nacer. La innovación y la inversión mejoran la supervivencia de las nuevas empresas manufactureras. La inversión en I+D aumenta el riesgo de las nuevas empresas, aunque mejore la competitividad de las empresas establecidas.

  4. Provocarea Facebook pentru bibliotecile publice din România

    Directory of Open Access Journals (Sweden)

    Octavia-Luciana Madge

    2014-01-01

    Full Text Available Reţelele sociale şi-au câştigat rapid un loc în viaţa noastră şi în activitatea multor organizaţii şi instituţii publice şi private. La nivelul bibliotecilor, reţelele sociale şi-au demonstrat utilitatea şi rolul în calitate de instrumente de marketing pentru o mai bună comunicare cu utilizatorii. Bibliotecile publice din România au cunoscut în ultimul timp transformări mari în ceea ce priveşte modul de abordare a relaţiei cu utilizatorii şi îmbunătăţirea activităţii lor. Au lansat, de asemenea, o serie de noi servicii pentru a răspunde nevoilor comunităţii pe care o servesc şi pentru a atrage noi utilizatori. Implementarea şi utilizarea de noi aplicaţii precum reţelele de socializare online, mai exact Facebook, a fost una dintre aceste dezvoltări recente. Această lucrare analizează modul în care reţelele sociale sunt utilizate la nivelul bibliotecilor publice din România prin exemplul a trei biblioteci publice mari şi a modului în care aceste biblioteci îşi promovează serviciile prin intermediul reţelei Facebook.

  5. Corrosion resistant steel

    International Nuclear Information System (INIS)

    Zubchenko, A.S.; Borisov, V.P.; Latyshev, V.B.

    1980-01-01

    Corrosion resistant steel for production of sheets and tubes containing C, Mn, Cr, Si, Fe is suggested. It is alloyed with vanadium and cerium for improving tensile properties and ductility. The steel can be melted by a conventional method in electric-arc or induction furnaces. The mentioned steel is intended to be used as a substitute for nickel-bearing austenitic steels

  6. Conversion electron Moessbauer and XPS study on the effect of polishing of a stainless steel sample

    International Nuclear Information System (INIS)

    Vertes, Cs.; Kuzmann, E.; Lakatos-Varsanyi, M.; Vertes, A.; Vass, G.; Romhanyi, K.

    1994-01-01

    Conversion electron Moessbauer spectroscopy (CEMS) and XPS has been used for the surface analysis of an 'X10CrNiTi 18/9 (DIN 1.7440)'-type stainless steel in order to determine the supposed structural and/or chemical changes in the surface layer caused by polishing. Both, CEMS and XPS results can be associated with the appearance of Fe nitride in the outer layer of steel samples after polishing, while no sing of nitrogen was detected in the bulk material. (author) 9 refs.; 3 figs.; 1 tab

  7. Ernst Rüdin, 1874-1952: a German psychiatrist and geneticist.

    Science.gov (United States)

    Weber, M M

    1996-07-26

    Ernst Rüdin (1874-1952) was one of the major representatives of German psychiatry, genetics, and eugenics in the first half of the twentieth century. Born in Switzerland, he was influenced early on by his brother-in-law Alfred Ploetz, who propagated the ideas of social Darwinism and "racial hygiene" in Germany after 1890. Rüdin began his career in psychiatry at Emil Kraepelin's clinic in Munich, where he developed the concept of "empirical genetic prognosis" of mental disorders. He published his first results on the genetics of schizophrenia in 1916. From 1917-1945 Rüdin was director of the Genealogical-Demographic Department at the German Institute for Psychiatric Research, which Kraepelin had founded. After a short interruption from 1925-1928, Rüdin returned to Munich and enlarged the department. After 1933 the National Socialist government and party endorsed Rüdin's work by supplying financial and manpower support. Nazi health policy required a scientific basis to justify its actions, and Rüdin's ideas corresponded partially with this kind of thinking. In 1934 he prepared the official commentary on the "Law for the Prevention of Genetically Diseased Offspring." The connections of Rüdin's department to National Socialism can be understood as one of the main reasons for the critical attitude towards psychiatric genetics in Germany after 1945.

  8. Plasma nitriding of steels

    CERN Document Server

    Aghajani, Hossein

    2017-01-01

    This book focuses on the effect of plasma nitriding on the properties of steels. Parameters of different grades of steels are considered, such as structural and constructional steels, stainless steels and tools steels. The reader will find within the text an introduction to nitriding treatment, the basis of plasma and its roll in nitriding. The authors also address the advantages and disadvantages of plasma nitriding in comparison with other nitriding methods. .

  9. EXPERIMENTAL RESEARCH REGARDING THE INFLUENCE OF CUTTING REGIME ON THE WEAR OF DRILLS AT STEEL PROCESSING

    Directory of Open Access Journals (Sweden)

    Leonard Marius CIUREZU GHERGHE

    2015-05-01

    Full Text Available This paper aims to highlight the influence of cutting regime on the wear drills at steel processing , in particular the processing of stainless steel X17CrNi16-2 SR EN 10088-4 DIN 17440. We are interested in wear of the drill at processing of this type of stainless steel , which has applicability in energy industry given the special characteristics of its. We want a maximum value of 0.2 mm for the wear of the drill, measurement and taking pictures are made using a microscope DigiMicro 2.0 and the software used is MicroCapture. Processing was done on machining center YMC YOUNG TECH 1050, and the tool used was 8 mm drill bit high speed steel.

  10. Comportamento dinâmico de um modelo simples solo-estrutura

    OpenAIRE

    Gonçalves, Fábio André Vaz

    2012-01-01

    Dissertação para obtencão do Grau de Mestre em Engenharia Civil - Perfil Estruturas O comportamento de uma estrutura sujeita a cargas dinâmicas depende de características como a massa, a rigidez dos vários elementos e da capacidade de dissipação de energia. A resposta dinâmica da estrutura apoiada num solo depende das propriedades dinâmicas dos dois sistemas. A resposta do sistema é influenciada pelos efeitos de interacção solo-estrutura. Nesta dissertação estudou-se um m...

  11. A ΔdinB mutation that sensitizes Escherichia coli to the lethal effects of UV- and X-radiation

    Energy Technology Data Exchange (ETDEWEB)

    Lee, Mei-Chong W.; Franco, Magdalena; Vargas, Doris M. [Department of Biological Sciences, San Jose State University, San Jose, CA 95192 (United States); Hudman, Deborah A. [Department of Microbiology and Immunology, A.T. Still University, Kirksville College of Osteopathic Medicine, Kirksville, MO 63501 (United States); White, Steven J. [Department of Biological Sciences, San Jose State University, San Jose, CA 95192 (United States); Fowler, Robert G., E-mail: rfowler@sjsu.edu [Department of Biological Sciences, San Jose State University, San Jose, CA 95192 (United States); Sargentini, Neil J. [Department of Microbiology and Immunology, A.T. Still University, Kirksville College of Osteopathic Medicine, Kirksville, MO 63501 (United States)

    2014-05-15

    Highlights: • We describe Δ(dinB-yafN)883(::kan), a novel dinB allele, referred to as ΔdinB883, a deletion that sensitizes E. coli cells to UV irradiation. • This UV radiation sensitivity is most acute in the early logarithmic phase of culture growth. • This UV radiation sensitivity is completely dependent upon a functional umuDC operon. • Sequencing reveals ΔdinB883 retains the proximal 161 nucleotides, i.e., 54 amino acids, of the wild-type sequence. • The ΔdinB883 mutant is hypothesized to produce a peptide of 83 amino acids, DinB883, that compromises UmuDC function. - Abstract: The DinB (PolIV) protein of Escherichia coli participates in several cellular functions. We investigated a dinB mutation, Δ(dinB-yafN)883(::kan) [referred to as ΔdinB883], which strongly sensitized E. coli cells to both UV- and X-radiation killing. Earlier reports indicated dinB mutations had no obvious effect on UV radiation sensitivity which we confirmed by showing that normal UV radiation sensitivity is conferred by the ΔdinB749 allele. Compared to a wild-type strain, the ΔdinB883 mutant was most sensitive (160-fold) in early to mid-logarithmic growth phase and much less sensitive (twofold) in late log or stationary phases, thus showing a growth phase-dependence for UV radiation sensitivity. This sensitizing effect of ΔdinB883 is assumed to be completely dependent upon the presence of UmuDC protein; since the ΔdinB883 mutation did not sensitize the ΔumuDC strain to UV radiation killing throughout log phase and early stationary phase growth. The DNA damage checkpoint activity of UmuDC was clearly affected by ΔdinB883 as shown by testing a umuC104 ΔdinB883 double-mutant. The sensitivities of the ΔumuDC strain and the ΔdinB883 ΔumuDC double-mutant strain were significantly greater than for the ΔdinB883 strain, suggesting that the ΔdinB883 allele only partially suppresses UmuDC activity. The ΔdinB883 mutation partially sensitized (fivefold) uvrA and uvr

  12. characterization and weldability of plasma nitrided P/M martensitic stainless steel X 20 Cr Ni 172

    International Nuclear Information System (INIS)

    Abdel-Karim, R.A.; El-demellawy, M.A; Waheed, A.F.

    2004-01-01

    stainless steels are widely used in nuclear applications, as a construction material. in these applications stainless steels suffer from corrosion degradation due severe environment and operating conditions. improving the engineering properties of such material prolong the service life time.in the present study, powder metallurgy technique namely plasma rotating electrode process (PREP) was used to produce martensitic steel DIN X 20 Cr Ni 172 with 0.5 % N. this step was followed by hot isostatic pressing process (HIP) . the effect of N on the weldability of this steel has been investigated . this included microstructure characterization, hardness evaluation and ferrite content measurements. the results showed that the presence of high nitrogen content in this steel resulted in a pore free structure with improved the hardness across the welding area. A single phase with few precipitates was detected on the grain boundaries in the heat affected zone. the results were supplemented by x-ray diffraction patterns and EDAX analysis

  13. Photoelectrochemical studies on passive films of stainless steels

    International Nuclear Information System (INIS)

    Schmuki, P.; Boehni, H.

    1992-01-01

    Passive films on stainless steels, which are known to exhibit a significantly different susceptibility to pitting corrosion (DIN 1.4301, 1.4439, 1.4529), were in-situ examined by photoelectrochemistry. The results show that the photoresponse is determined by the defects in the electronic structure of the films leading to localized states in the band-gap region. It was found that the three different steels exhibit a different tailing of the density of states function into the band-gap region. The less deep localized states are present, the higher is the resistance of the material against pitting corrosion. It is therefore concluded that a correlation between the distribution of localized states in the passive film - i.e. its defect structure - and the stability of the film exists

  14. DINS measurements on VESUVIO in the Resonance Detector configuration: proton mean kinetic energy in water

    Science.gov (United States)

    Pietropaolo, Antonino; Andreani, Carla; Filabozzi, Alessandra; Senesi, Roberto; Gorini, Giuseppe; Perelli-Cippo, Enrico; Tardocchi, Marco; Rhodes, Nigel J.; Schooneveld, Erik M.

    2006-04-01

    Deep Inelastic Neutron Scattering (DINS) measurements have been performed on a liquid water sample at two different temperatures and pressures. The experiments were carried out using the VESUVIO spectrometer at the ISIS spallation neutron source. This experiment represents the first DINS measurement from water using the Resonance Detector configuration, employing yttrium-aluminum-perovskite scintillator and a 238U analyzer foil. The maximum energy of the scattered neutrons was about 70 eV, allowing to access an extended kinematic space with energy and wave vector transfers at the proton recoil peak in the range 1 eV <= hbarω <= 20 eV and 25 Å-1 <= q <= 90 Å-1, respectively. Comparison with DINS measurements on water performed in the standard Resonance Filter configuration indicates the potential advantages offered by the use of Resonance Detector approach for DINS measurements at forward scattering angles.

  15. Manufacturing of microcomponents in a research institute under DIN EN ISO 9001

    Science.gov (United States)

    Maas, Dieter; Karl, Bernhard; Saile, Volker; Schulz, Joachim

    2000-08-01

    The Institute for Microstructure Technology at Forschungszentrum Karlsruhe has implemented a rigorous quality management system and was certified according to the DIN ISO EN 9001 standard in January 2000.

  16. DIN 51003: the standard of TXRF basics and definitions

    International Nuclear Information System (INIS)

    Reus, U.; Prange, A.

    2000-01-01

    As part of the world-wide effort to standardize analytical methods, a team of TXRF users has elaborated the draft of a new DIN standard (German Industry Standard) on basic terms and definitions related to TXRF analysis. This draft ('yellow-print') is now open for discussion, and its structure and principal contents will be presented here. The new standard is subdivided into the following subjects: introduction, scope of application and normative remarks; general terms (in x-ray spectroscopy); physics, of TXRF; x-ray sources; conditioning of the primary x-ray beam; measurement of x-ray fluorescence with energy-dispersive spectrometers; samples; measurement and evaluation of data; traceability; applications of TXRF. The more important items will be discussed in the present paper. It should be pointed out that this standard is meant primarily to give a common basis for physical terms and general denotations to be used in TXRF analysis, i.e. it does not include specific working prescriptions for analytical tasks. However, such prescriptions will be given - in a more generalized form - in a number of appendices to the main document, thus covering the major fields of application of TXRF. In order to enable acceptance of the standard on an international basis, an ISO standard is also in preparation. (author)

  17. Dinámicas de la violencia guerrillera en Colombia

    Directory of Open Access Journals (Sweden)

    Jerónimo Ríos Sierra

    2016-01-01

    Full Text Available El propósito de este artículo es analizar las dinámicas de la violencia directa derivada de los dos principales grupos guerrilleros que alimentan el conflicto armado interno colombiano, las Fuerzas Armadas Revolucionarias de Colombia (FARC y el Ejército de Liberación Nacional (ELN. Se utiliza un diseño cuantitativo, de carácter descriptivo y explicativo, donde, de acuerdo a una lógica deductiva, se compara la información disponible del año 2015 con la información del año 2012 y anteriores. Se recurre a las bases de datos que fueron facilitadas por el Observatorio de Derechos Humanos y Derecho Internacional Humanitario (ODHDIH, s.f., adscrito a la Presidencia de la República, y por la Oficina de Naciones Unidas contra la Droga y el Delito, conocida por sus siglas en inglés (UNODC, 2016. Se muestra cómo la tendencia que explica el activismo armado de las guerrillas colombianas responde a un doble proceso de periferialización y narcotización. Una doble tendencia que puede definir los paradigmas a los que deberá enfrentar la política de seguridad colombiana en el marco transformador que representan tanto los acuerdos de paz con las FARC como las negociaciones exploratorias con el ELN.

  18. Propiedades mecánicas de uniones obtenidas mediante soldadura por difusión dinámica en un acero de media aleación

    Directory of Open Access Journals (Sweden)

    Gómez de Salazar, J. M.

    2001-04-01

    Full Text Available Mechanical properties in Dynamic Diffusion Bonded (DDB in a A.S.T.M. 1045 steel (0.45 %C joints were studied. The thermomechanical cycle added to the process, favours both the initial deformation stage and probably the diffusion mechanism which participate in bond formation.

    En el presente trabajo se estudian las propiedades mecánicas de uniones obtenidas mediante Soldadura por Difusión Dinámica (SDD en un acero ASTM 1045 (0,45 %C. La aplicación de ciclos termomecánicos en el proceso favorece las etapas iniciales de deformación y, probablemente, los mecanismos difusivos que participan en la formación de la unión.

  19. Una solución dinámica para juegos con utilidades transferibles

    Directory of Open Access Journals (Sweden)

    Juan Carlos Cesco

    2008-01-01

    Full Text Available En este trabajo definimos un tipo de solución dinámica para juegos con utilidades transferibles. La solución dinámica fue introducida por Shenoy (1980 en el marco de juegos abstractos como un medio para describir algunos procesos de negociación. En el contexto de los juegos con utilidades transferibles estudiamos su comportamiento tanto en la clase de los juegos equilibrados (con Core no vacío como en el de los juegos no equilibrados. En esta última subclase mostramos que la solución dinámica debe contener los elementos de ciertos ciclos de preimputaciones denominados ciclos maximales. Estos ciclos aparecen en relación con un esquema dinámico elaborado originalmente para aproximar puntos en el Core de un juego. En la subclase de los juegos equilibrados, la solución dinámica coincide con el Core, lo que establece un enfoque unificado de solución. El problema de existencia de ciclos maximales no está completamente resuelto, pero en algunas subclases de juegos podemos exhibir teoremas de existencia y una descripción completa de la solución dinámica.

  20. Induction surface hardening of hard coated steels

    Energy Technology Data Exchange (ETDEWEB)

    Pantleon, K.; Kessler, O.; Hoffann, F.; Mayr, P. [Stiftung Inst. fuer Werkstofftechnik, Bremen (Germany)

    1999-11-01

    The properties of hard coatings deposited using CVD processes are usually excellent. However, high deposition temperatures negatively influence the substrate properties, especially in the case of low alloyed steels. Therefore, a subsequent heat treatment is necessary to restore the properties of steel substrates. Here, induction surface hardening is used as a method of heat treatment after the deposition of TiN hard coatings on AISI 4140 (DIN42CrMo4) substrates. The influences of the heat treatment on both the coating and the substrate properties are discussed in relation to the parameters of induction heating. Thereby, the heating time, heating atmosphere and the power input into the coating-substrate compounds are varied. As a result of induction surface hardening, the properties of the substrates are improved without losing good coating properties. High hardness values in the substrate near the interface allow the AISI 4140 substrates to support TiN hard coatings very well. Consequently, higher critical loads are measured in scratch tests after the heat treatment. Also, compressive residual stresses in the substrate are generated. In addition, only a very low distortion appears. (orig.)

  1. Evaluation of the New DIN Standard for Quality Assurance of Diagnostic Displays - Technical Review DIN 6868-157.

    Science.gov (United States)

    Entz, Kathrin; Sommer, Alexander; Lenzen, Horst

    2018-01-01

    Acceptance and regular constancy tests are necessary to ensure the quality of diagnostic displays. In November 2014, a new standard (DIN 6868-157) was published which defines the test procedure and limiting values. There are several substantial changes compared with the previous standard DIN V 6868-57, i. e. considering the complete image display system including workstation and application software instead of only the displays. Since its publication, the new standard has raised many questions. This technical review aims to show the strengths and weaknesses of the new standard. Positive aspects are the introduction of a limiting value for the illuminance and the extension of the interval for constancy tests from 3 to 6 six months. The daily constancy test on the other hand, raises several problems and should be replaced by a randomized test. Additionally, the medical relevance is critically questioned and an overview of software for the quality assurance will be given.   · Acceptance and constancy tests for diagnostic displays are defined in DIN 6868-157.. · The new standards has positive and negative aspects.. · Randomized tests should be introduced.. · Entz K, Sommer A, Lenzen H. DIN 6868-157: Image Quality Assurance in Diagnostic X-ray Departments - X-ray Ordinance Acceptance and Constancy Test of Image Display Systems in their Environment - Technical Review -. Fortschr Röntgenstr 2018; 190: 51 - 60. © Georg Thieme Verlag KG Stuttgart · New York.

  2. Estabilizações lombares dinâmicas Estabilizaciones lumbares dinámicas Lumbar dynamic stabilizations

    Directory of Open Access Journals (Sweden)

    Ivan Dias Rocha

    2012-01-01

    Full Text Available O funcionamento fisiológico normal da coluna depende da movimentação normal de cada unidade motora, que consiste em duas vértebras e o disco intervertebral interposto entre elas. Embora a artrodese da coluna vertebral venha sendo utilizada para o tratamento de diversas doenças da coluna, essa modalidade de tratamento acarreta a perda de movimentação dos níveis em que houve a fusão e como consequência pode sobrecarregar os níveis adjacentes podendo provocar a sua degeneração precoce. Proponentes das técnicas de estabilização dinâmicas acreditam que estas podem levar a correção dos problemas minimizando o risco de degeneração dos níveis adjacentes. Atualmente existem no mercado diversos métodos de estabilização dinâmica anteriores e posteriores. Já existem trabalhos biomecânicos que comprovam o benefício teórico de quase todos eles, porém ainda hoje, faltam ensaios clínicos que comprovem a sua utilidade e segurança por longos períodos de seguimento para o paciente. Portanto é fundamental que estes materiais sejam analisados de maneira acadêmica para que no futuro próximo possam ser utilizados em situações precisas e com segurança para os pacientes.El funcionamiento fisiológico normal de la columna depende de los movimientos normales de cada unidad motora, la cual consiste de dos vértebras y del disco intervertebral interpuesto entre ellas. Aunque la artrodesis de la columna vertebral está siendo utilizada para el tratamiento de diversas enfermedades de la columna, esa modalidad de tratamiento causa la pérdida de los movimientos en los niveles en los que hubo la fusión y, como consecuencia, puede sobrecargar los niveles adyacentes, pudiendo provocar su degeneración precoz. Los proponentes de las técnicas de estabilización dinámica creen que éstas pueden llevar a la corrección de los problemas, minimizando el riesgo de degeneración de los niveles adyacentes. Actualmente, existen en el mercado

  3. Simulación de la fluencia en caliente de un acero microaleado con un contenido medio de carbono. II parte. Recristalización dinámica: inicio y cinética

    Directory of Open Access Journals (Sweden)

    Cabrera, J. M.

    1997-06-01

    Full Text Available According to the part 1 of this work, in this second part the dynamic recrystallization of a commercial medium carbon microalloyed steel is characterized from the point of view of its onset and kinetics. For this purpose uniaxial hot compression tests were carried out over a range of five orders of magnitude in strain rate and 300 °C of temperature. Experimental results are compared with those reported in the literature and the possible effect of dynamic precipitation is also analyzed. It is verified that the kinetics of dynamic recrystallization can faithfully be described by the classical Avrami equation.

    Siguiendo el planteamiento efectuado en la I parte de este trabajo, en esta II parte se caracteriza la recristalización dinámica de un acero comercial microaleado con un contenido medio de carbono desde el punto de vista de su inicio y de su cinética. Con este objeto se efectuaron ensayos de compresión uniaxial en caliente en un intervalo de cinco órdenes de magnitud en velocidad de deformación y 300 °C de temperatura. Los resultados experimentales se comparan con los resultados reportados por diversos autores y se analizan los posibles efectos de precipitación dinámica. Se verifica que la cinética de la recristalización dinámica puede representarse fielmente por la ecuación de Avrami.

  4. Methods of forging steel

    OpenAIRE

    Pečoler, Primož

    2014-01-01

    The following work presents processes of steel forming, challenges when forging steel, forming machines suitable for forging and which choice of machine is most suitable for forging. We can separate steel forming to free forging and drop forging. Free forging can be divided to hand forging and machine forging. The correct choice of furnaces is also very important. We must reach correct temperature in the furnace for raw steel to melt with less scalings. In diploma I mentioned some machine...

  5. Prospects of structural steels

    International Nuclear Information System (INIS)

    Bannykh, O.A.

    2012-01-01

    The current state of world steel production is considered as well as the development strategy of metallurgy industry in the Russian Federation through to 2020. The main factors determining the conservation of steel as perspective material for industry are given: energy expenses on production, the well-proven recirculation technology, the capability of changing steel properties in wide range, temperature range of operation. The conclusion is made that in the immediate future steel will not lose its importance [ru

  6. Trends in steel technology

    International Nuclear Information System (INIS)

    Anon.

    1980-01-01

    Dual phase steels, composite products, and microalloyed steels are making inroads in the automotive industry applications for bumpers, automotive parts, bodies, mechanical parts, suspension and steering equipment and truck bumpers. New steels are also used to support solar mirrors and cells, in corrosive environments in the oil and gas industry, fusion reactors, and pressure vessels in nuclear power plants

  7. Desentendimiento moral y dinámicas del robo escolar

    Directory of Open Access Journals (Sweden)

    Claudia Bolívar

    2010-06-01

    Full Text Available En una investigación reciente sobre violencia escolar en Bogotá, Colombia, el 56% de los estudiantes reportaron haber sido robados en el colegio durante el último año. El presente estudio cualitativo, de corte deductivo, pretendió profundizar en este fenómeno, buscando comprender las dinámicas de robos, así como los mecanismos de desentendimiento moral que podrían estar facilitando que los vinculados sientan menos culpa. El estudio fue realizado en un colegio público de nivel socioeconómico bajo y con altos niveles de criminalidad en su contexto comunitario. Inicialmente, 227 alumnos de sexto y octavo grados respondieron una encuesta de actitudes frente al robo. Con base en sus respuestas, 20 estudiantes con niveles altos de favorabilidad fueron entrevistados, y 40 que tenían niveles bajos o promedio de favorabilidad participaron en grupos focales. Los resultados indicaron que el robo en este colegio presenta un nivel elevado de organización, e involucra con frecuencia planeación, división de labores y amenazas. Además, según los participantes, el robo está muy relacionado con la presencia de pandillas en el colegio y con la falta de respuesta institucional clara y consistente. También se encontró que los involucrados recurren a varios mecanismos de desentendimiento moral, como las comparaciones ventajosas, el desplazamiento o la difusión de la responsabilidad, y la atribución de la culpa, como estrategias para justificar sus acciones. El estudio indica que es urgente implementar y evaluar intervenciones que busquen prevenir tanto el robo como la vinculación a trayectorias delictivas tempranas.

  8. Study of the influence of mechanical - thermal treatments on the creep behavior of a niobium stainless steel

    International Nuclear Information System (INIS)

    Rossi, J.L.; Ferreira, P.I.

    1986-01-01

    The influence of microstructural parameters controlled by mechanical-thermal treatment |1| on the creep behavior of DIN-Werkstoff-Nr. 1.4981 stainless steel (material candidate for use as cladding of fast breeder reactor (fuel elements), is studied. The effects of the solution treatment, predeformation, predeformation puls aging and cycles of predeformation-ageing on the creep results obtained at 990 K, for apllied stresses in the range 70 MPc - 310 MPa, are discussed. (Author) [pt

  9. [DIN-compatible vision assessment of increased reproducibility using staircase measurement and maximum likelihood analysis].

    Science.gov (United States)

    Weigmann, U; Petersen, J

    1996-08-01

    Visual acuity determination according to DIN 58,220 does not make full use of the information received about the patient, in contrast to the staircase method. Thus, testing the same number of optotypes, the staircase method should yield more reproducible acuity results. On the other hand, the staircase method gives systematically higher acuity values because it converges on the 48% point of the psychometric function (for Landolt rings in eight positions) and not on the 65% probability, as DIN 58,220 with criterion 3/5 does. This bias can be avoided by means of a modified evaluation. Using the staircase data we performed a maximum likelihood estimate of the psychometric function as a whole and computed the acuity value for 65% probability of correct answers. We determined monocular visual acuity in 102 persons with widely differing visual performance. Each subject underwent four tests in random order, two according to DIN 58,220 and two using the modified staircase method (Landolt rings in eight positions scaled by a factor 1.26; PC monitor with 1024 x 768 pixels; distance 4.5 m). Each test was performed with 25 optotypes. The two procedures provide the same mean visual acuity values (difference less than 0.02 acuity steps). The test-retest results match in 30.4% of DIN repetitions but in 50% of the staircases. The standard deviation of the test-retest difference is 1.41 (DIN) and 1.06 (modified staircase) acuity steps. Thus the standard deviation of the single test is 1.0 (DIN) and 0.75 (modified staircase) acuity steps. The new method provides visual acuity values identical to DIN 58,220 but is superior with respect to reproducibility.

  10. Estimation of residual stresses in reactor pressure vessel steel specimens clad by stainless steel strip electrodes

    International Nuclear Information System (INIS)

    Schimmoeller, H.A.; Ruge, J.L.

    1978-01-01

    The equations to determine a two-dimensional state of residual stress in flat laminated plates are well known from an earlier work by one of the authors. The derivation of these equations leads to a linear, inhomogeneous system of Volterra's integral equations of the second kind. To ascertain the unknown residual stresses from these equations it is necessary to cut down the thickness of the test plate layer by layer. This results in two-dimensional deformation reactions in the rest of the test plate, which can be measured, e.g. by a strain gauge rosette applied to the opposite side of the plate. The above-mentioned stress analysis has been transferred to 86mm thick reactor pressure vessel steel specimens (Type 22NiMoCr 37, DIN-No. 1.6751, similar to ASTM A508, Class 2) double-run clad by austenitic stainless steel strip electrodes (first layer 24/13 Cr-Ni steel, second layer 21/10 Cr-Ni steel). The overall dimensions of the clad specimens investigated amounted to 200 x 200 x (86+4.5+4.5)mm. At the surface of the austenitic cladding there is a two-dimensional tensile normal stress state of about 200N/mm 2 parallel, and about 300N/mm 2 transverse, to the welding direction. The maximum tensile stress was 8mm below the interface (fusion line, material transition) in the parent material. The stress distributions of the specimens investigated, determined on the basis of the above-mentioned combined experimental mathematical procedure, are presented graphically for the as-welded (as-delivered) and annealed (600 0 C/12hr) conditions. (author)

  11. Weldability of Stainless Steels

    International Nuclear Information System (INIS)

    Saida, Kazuyoshi

    2010-01-01

    It gives an outline of metallographic properties of welding zone of stainless steels, generation and mechanisms of welding crack and decreasing of corrosion resistance of welding zone. It consists of seven chapters such as introduction, some kinds of stainless steels and properties, metallographic properties of welding zone, weld crack, toughness of welding zone, corrosion resistance and summary. The solidification modes of stainless steels, each solidification mode on the cross section of Fe-Cr-Ni alloy phase diagram, each solidification mode of weld stainless steels metal by electron beam welding, segregation state of alloy elements at each solidification mode, Schaeffler diagram, Delong diagram, effects of (P + S) mass content in % and Cr/Ni equivalent on solidification cracking of weld stainless steels metal, solidification crack susceptibility of weld high purity stainless steels metal, effects of trace impurity elements on solidification crack susceptibility of weld high purity stainless steels metal, ductile fracture susceptibility of weld austenitic stainless steels metal, effects of H2 and ferrite content on generation of crack of weld 25Cr-5N duplex stainless steels, effects of O and N content on toughness of weld SUS 447J1 metals, effect of ferrite content on aging toughness of weld austenitic stainless steel metal, corrosion morphology of welding zone of stainless steels, generation mechanism of knife line attack phenomenon, and corrosion potential of some kinds of metals in seawater at room temperature are illustrated. (S.Y.)

  12. The steel scrap age.

    Science.gov (United States)

    Pauliuk, Stefan; Milford, Rachel L; Müller, Daniel B; Allwood, Julian M

    2013-04-02

    Steel production accounts for 25% of industrial carbon emissions. Long-term forecasts of steel demand and scrap supply are needed to develop strategies for how the steel industry could respond to industrialization and urbanization in the developing world while simultaneously reducing its environmental impact, and in particular, its carbon footprint. We developed a dynamic stock model to estimate future final demand for steel and the available scrap for 10 world regions. Based on evidence from developed countries, we assumed that per capita in-use stocks will saturate eventually. We determined the response of the entire steel cycle to stock saturation, in particular the future split between primary and secondary steel production. During the 21st century, steel demand may peak in the developed world, China, the Middle East, Latin America, and India. As China completes its industrialization, global primary steel production may peak between 2020 and 2030 and decline thereafter. We developed a capacity model to show how extensive trade of finished steel could prolong the lifetime of the Chinese steelmaking assets. Secondary steel production will more than double by 2050, and it may surpass primary production between 2050 and 2060: the late 21st century can become the steel scrap age.

  13. The Effects of The Industrial Cryogenic Process on The Wear Behaviours of AISI D2 Cold Work Tool Steels

    OpenAIRE

    Ersöz, Enes; Ovalı, İsmail

    2018-01-01

    In this study, industrial cryogenic process afterconventional heat treatment process for various holding time was applied toAISI D2 (DIN 1.2379) cold work tool steel. The effects of the industrialcryogenic process on the wear behavior was investigated. In the wear test 5,10and 15 N forces were carried out to all group specimens at a constant shearrate (3,16 m/s) and three different wear distances. Experimental results showthat cryogenic processing of AISI D2 cold work tool steels have a signi...

  14. The microstructural stability and mechanical properties of two low activation martensitic steels

    International Nuclear Information System (INIS)

    Victoria, M.; Marmy, P.; Batawi, E.; Peters, J.; Briguet, C.; Rezai-Aria, F.; Gavillet, D.

    1996-01-01

    A desirable feature of future magnetically confined fusion reactors is the prospect of producing low level radioactive waste. In order to minimize the volume of radioactive material, in particular from the first wall and blanket structures, reduced long term activation alloys are being developed. Here, a low activation composition of a martensitic 9% Cr steel has been studied, based on the DIN (Deutsches Inst. fuer Normung) 1.4914 composition (MANET) but replacing Ni, Mo and Nb by the low activation elements W, V and Ta. Two casts were produced from high purity components, in which the effects of controlled additions of Mn (0.58 and 0.055 wt. %) and N (7 and 290 wt. ppm) were studied, so that the final compositions resulted in one cast with high Mn and low N (steel A) and the other with the opposite conditions (steel B). The two steels were evaluated in terms of structural stability and mechanical properties under tensile, fatigue and fracture toughness tests. It has been found that both alloys have a DBTT below room temperature, which in the case of the steel A is 70 K below that of MANET. Although the tensile strength is somewhat below that of the parent steel, both steels have longer fatigue life

  15. Localized landslide risk assessment with multi pass L band DInSAR analysis

    Science.gov (United States)

    Yun, HyeWon; Rack Kim, Jung; Lin, Shih-Yuan; Choi, YunSoo

    2014-05-01

    In terms of data availability and error correction, landslide forecasting by Differential Interferometric SAR (DInSAR) analysis is not easy task. Especially, the landslides by the anthropogenic construction activities frequently occurred in the localized cutting side of mountainous area. In such circumstances, it is difficult to attain sufficient enough accuracy because of the external factors inducing the error component in electromagnetic wave propagation. For instance, the local climate characteristics such as orographic effect and the proximity to water source can produce the significant anomalies in the water vapor distribution and consequently result in the error components of InSAR phase angle measurements. Moreover the high altitude parts of target area cause the stratified tropospheric delay error in DInSAR measurement. The other obstacle in DInSAR observation over the potential landside site is the vegetation canopy which causes the decorrelation of InSAR phase. Thus rather than C band sensor such as ENVISAT, ERS and RADARSAT, DInSAR analysis with L band ALOS PLASAR is more recommendable. Together with the introduction of L band DInSAR analysis, the improved DInSAR technique to cope all above obstacles is necessary. Thus we employed two approaches i.e. StaMPS/MTI (Stanford Method for Persistent Scatterers/Multi-Temporal InSAR, Hopper et al., 2007) which was newly developed for extracting the reliable deformation values through time series analysis and two pass DInSAR with the error term compensation based on the external weather information in this study. Since the water vapor observation from spaceborne radiometer is not feasible by the temporal gap in this case, the quantities from weather Research Forecasting (WRF) with 1 km spatial resolution was used to address the atmospheric phase error in two pass DInSAR analysis. Also it was observed that base DEM offset with time dependent perpendicular baselines of InSAR time series produce a significant error

  16. Planificación de trayectorias para un robot tipo con restricciones dinámicas

    Directory of Open Access Journals (Sweden)

    Leonardo Solaque Guzmán

    2008-01-01

    Full Text Available Este documento presenta una aproximación a la planificación de caminos óptimos para un sistema con restricciones dinámicas y desplazándose dentro de un espacio libre de obstáculos. Se considera el modelo dinámico del dirigible y un análisis para el planteamiento de modelos simplificados o comúnmente conocidos como modelos de control. Se propone una planificación de la trayectoria desde el punto de vista de la teoría óptima utilizando un modelo de la dinámica de un robot móvil (que se desplaza a velocidad constante y en avance, es decir con restricciones dinámicas como punto de partida para la primera aproximación a los caminos óptimos. Para el suavizado de las trayectorias del dirigible se proponen dos modelos con relajación en la dinámica de la variable de control y finalmente se presenta una simulación de la comparación de los diferentes resultados.

  17. Colin Rowe y el equilibrio dinámico

    Directory of Open Access Journals (Sweden)

    Pablo López Martín

    2015-05-01

    Full Text Available ResumenEn 1944 Gyorgy Kepes publica el que sin duda será su texto más influyente, El lenguaje de la visión. En él Kepes trata de llevar a cabo una guía que explique la gramática y la sintaxis del fenómeno de la visión, y que sirva como herramienta para enfrentarse al arte como experiencia puramente sensorial, desprovista de toda carga literaria, semántica o sentimental.De todos los conceptos que Kepes desgrana en su ensayo quizá el más determinante de todos sea el denominado como equilibrio dinámico y que aparece por primera vez en esta obra . Este término logra verbalizar algo que estaba en el aire, orbitando alrededor de toda la plástica moderna, pero que hasta el momento sólo había sido explicado de forma empírica.En Colin Rowe reverbera la lectura reciente de las ideas kepesianas cuando escribe sus artículos Transparencia literal y fenomenal y Neo-“clasicismo” y arquitectura moderna I y II tratando de poner en evidencia los principios fundacionales del movimiento moderno que negaban la dimensión plástica de la disciplina . El artículo tratará sacar de a la luz y explicar esta influencia. AbstractIn 1944 Gyorgy Kepes published what undoubtless will be his most influential text, "The language of vision". What Kepes tried to do was a guide of grammar and syntax of vision, which allows to face art as purely sensory experience or just visual, devisted of any literary , semantic or sentimental meaning.Among all the concepts that Kepes developes in his essay perhaps the most decisive one is the so called dynamic equilibrium, which is introduced in this work for fi rst time, verbalizing something that was in the air, orbiting around the entire modern plastic but far only explained in an empirical way.Colin Rowe reverberates the recent readed kepesian ideas on his own writings Transparency: Literal and Phenomenal and Neo-'Classicism' and Modern Architecture I and II, when the author tries to highlight the founding

  18. Effect of Co deposition on oxidation behavior and electrical properties of ferritic steel for solid oxide fuel cell interconnects

    Energy Technology Data Exchange (ETDEWEB)

    Kruk, A.; Adamczyk, A.; Gil, A. [AGH University of Science and Technology, Faculty of Materials Science and Ceramics, al. Mickiewicza 30, 30-059 Krakow (Poland); Kąc, S. [AGH University of Science and Technology, Faculty of Metals Engineering and Industrial Computer Science, al. Mickiewicza 30, 30-059 Krakow (Poland); Dąbek, J.; Ziąbka, M. [AGH University of Science and Technology, Faculty of Materials Science and Ceramics, al. Mickiewicza 30, 30-059 Krakow (Poland); Brylewski, T., E-mail: brylew@agh.edu.pl [AGH University of Science and Technology, Faculty of Materials Science and Ceramics, al. Mickiewicza 30, 30-059 Krakow (Poland)

    2015-09-01

    In this work, a Co layer deposited on DIN 50049 steel by means of pulsed laser deposition was applied for the protection of solid oxide fuel cell (SOFC) interconnects operating on the cathode side. The coated and uncoated steel samples were oxidized in air at 1073 K for 500 h, and their microstructures as well as electrical resistances were evaluated using X-ray diffraction, atomic force microscopy, scanning electron microscopy coupled with energy-dispersive X-ray spectroscopy, and the 2-probe 4-point direct current method. It was demonstrated that the Co coating had reduced the oxidation rate of the steel by nearly a half. The area-specific resistance value of the coated steel was 5 × 10{sup −6} Ω·m{sup 2}, which was significantly lower than that of bare steel after 350 h of oxidation at 1073 K. Cr vaporization tests showed that the Co coating was efficient at blocking the outward diffusion of Cr. The obtained results prove that steel coated with a thin film of cobalt was suitable for use as metallic interconnect material in SOFCs operating at intermediate temperatures. - Highlights: • Co layer was deposited on ferritic steel by means of pulsed laser deposition. • Coated and bare ferritic steel samples were exposed to air at 1073 K for 500 h. • Scale growth rate on bare steel is higher than that on coated steel. • Electrical resistance for oxidized coated steel was lower than for bare steel. • Co-coated steel effectively reduced the formation of volatile Cr species.

  19. Influence of TiC precipitation in austenitic stainless steel on strength, ductility and helium embrittlement

    International Nuclear Information System (INIS)

    Kesternich, W.; Matta, M.K.; Rothaut, J.

    1984-01-01

    Creep experiments were performed on 1.4970 (German DIN standard) and 316 (AISI standard) type austenitic steels after various thermomechanical pretreatments and after α-implantation. The microstructure introduced by the pretreatments was characterized by transmission electron microscopy and the behaviour of strength and ductility is correlated to the dislocation and precipitate distributions. He embrittlement can be suppressed in these simulation experiments when dispersive TiC precipitate distributions are produced by the proper pretreatments or are allowed to form during creep testing. It is shown that adequate pretreatment results in a significantly superior behaviour of the 1.4970 steel as compared to the 316 type steel in all three investigated properties, i.e. strength, ductility and resistance to He embrittlement. (orig.)

  20. Development of ferritic steels for steam generators of fast breeder reactors

    International Nuclear Information System (INIS)

    Nguyen-Thanh; Vigneron, G.; Vanderschaeghe, A.

    1988-01-01

    STEIN INDUSTRIE, a manufacturer of equipment for the conventional and nuclear power industry, has built up expertise in the use of Cr-Mo steels used at high temperatures. The main ferritic steels developed were 10 CD 9-10 (AFNOR), Z10 CDNb V 9-2 (AFNOR), X 20 Cr Mo V 12-1 (DIN) and ASTM Grade 9.1. For the fast breeder reactor system, STEIN INDUSTRIE proposes the use of these steels in the construction of steam generators. The wide programme of development undertaken by STEIN INDUSTRIE is aimed at the following main subjects: - characterization of materials - welding and bending tests - studies of special junctions. This article reports the results obtained

  1. La flexibilitat en els àcids nucleics: Un estudi de dinàmica molecular

    OpenAIRE

    Noy Freixa, Agnès

    2008-01-01

    [cat] L'estat de l'art de les simulacions de dinàmica molecular és utilitzat per estudiar l'estructura, dinàmica, propietats d'interacció molecular i flexibilitat dels dúplexs d'ADN i ARN en solució acuosa. Les nostres simulacions suggereixen que el concepte de flexibilitat, rigidesa i deformabilitat són molt més complexes del que habitualment es creu, i que per tant no és sempre veritat que l'ADN sigui més flexible que l'ARN. La dinàmica molecular és a més utilitzada per investigar les prop...

  2. Flexibilitat en els àcids nucleics: Un estudi de dinàmica molecular, La

    OpenAIRE

    Noy Freixa, Agnès

    2008-01-01

    L'estat de l'art de les simulacions de dinàmica molecular és utilitzat per estudiar l'estructura, dinàmica, propietats d'interacció molecular i flexibilitat dels dúplexs d'ADN i ARN en solució acuosa. Les nostres simulacions suggereixen que el concepte de flexibilitat, rigidesa i deformabilitat són molt més complexes del que habitualment es creu, i que per tant no és sempre veritat que l'ADN sigui més flexible que l'ARN.La dinàmica molecular és a més utilitzada per investigar les propietats d...

  3. Estudio dinámico de un potencial perturbador dependiente de dos parámetros

    Science.gov (United States)

    Miloni, O.; Brunini, A.

    El objeto del presente trabajo consiste en el estudio dinámico de un sistema dinámico caracterizado por la función hamiltoniana correspondiente a un satélite planetario perturbado por la acción del Sol y del achatamiento del planeta madre. Cuando dicha Hamiltoniana se promedia respecto de los términos de corto período, esta queda con dos grados de libertad, y su estudio puede ser realizado con las herramientas clásicas de la dinámica no-lineal. Se tratará de determinar regiones regulares y caóticas de movimiento. En el caso de estas últimas, es de particular interés la determinación de su orígen.

  4. Analisis Kecenderungan Manhaj Akidah Shaykh Shams al-Din al-Sumatera’i

    Directory of Open Access Journals (Sweden)

    MOHD HAIDHAR KAMARZAMAN

    2016-12-01

    Full Text Available Shaykh Shams al-Din al-Sumatera'i is a very great and respected scholar during 16th and 17th century of Acheh. His knowledge in various fields recognized by local and international scholars. He had been a Qadi Malik al-’Adil, a religious leader, who became a referred by communities and country during the reign of the three Sultans of Aceh. He has authored nearly 40 pieces of books related to the theology and sufism. This study focuses on the methods used by Shaykh Shams al-Din al-Sumatera'i in his theological writings. This study found that Shaykh Shams al-Din al-Sumatera'i had used six methods in the such writings.

  5. Mand træn din bækkenbund og få bedre rejsning

    DEFF Research Database (Denmark)

    Ravnkilde Marlet, Laila; Gerbild, Helle Nygaard

    2016-01-01

    Har du (eller din mand) problemer med at holde på urin eller at opnå eller bevare rejsningen, er der god grund til at søge hjælp. Der findes nemlig effektive og billige behandlingsmuligheder.......Har du (eller din mand) problemer med at holde på urin eller at opnå eller bevare rejsningen, er der god grund til at søge hjælp. Der findes nemlig effektive og billige behandlingsmuligheder....

  6. IMUNOREACTIVITATEA ÎNCRUCIŞATĂ POTENŢIALĂ A GLOBULINELOR DE REZERVĂ DIN SEMINŢE

    Directory of Open Access Journals (Sweden)

    Ala CHERDIVARĂ

    2018-03-01

    Full Text Available Globulinele de rezervă 7S şi 11S din seminţele de arahide şi de soia, ca ingrediente naturale ale alimentelor, pot determina dezvoltarea reacţiei alergice cauzate de formarea intensivă a imunoglobulinelor E (IgE alergen specifice. Secvenţele de aminoacizi ale globulinelor de rezervă din seminţe sunt conservative; prin urmare, în secvenţele multora dintre ele există situsuri care sunt similare în structura primară a epitopilor IgE, ceea ce determină alergenicitatea glo­bu­linelor 7S şi 11S din arahide şi soia. În prezentul studiu a fost efectuată o evaluare cantitativă a probabilităţii prezenţei epitopilor IgE, care determină imunoreactivitatea încrucişată stabilită a globulinelor de rezervă din arahide şi din soia în globulinele 7S şi 11S din seminţele altor plante.A fost efectuată o estimare cantitativă a probabilității prezenței epitopilor IgE ce determină imunoreactivitatea încrucișată stabilită a globulinelor de rezervă din arahide și soia în secvențele de aminoacizi ale globulinelor 7S și 11S din semințele altor plante.POTENTIAL CROSS IMMUNOREACTIVITY OF SEED STORAGE GLOBULINSSeed storage 7S and 11S globulins of peanut and soybean as natural components of food can lead to the development of increased allergic sensitivity caused by the intensive formation of allergen-specific immunoglobulin E (IgE. The amino acid sequences of the seed storage globulins are conservative, therefore, in the sequences of many of them there are sites that are close similar of IgE epitopes of 7S and 11S globulins of peanuts and soybeans.In the present work, a quantitative assessment of the probability of the presence of IgE epitopes determining the established cross immunoreactivity of seed storage globulins of peanuts and soybeans, in the sequences of 7S and 11S seed storage globulins of other plants was carried out.

  7. Dinámica de sistemas en la gestión de inventarios

    OpenAIRE

    Daniel Alejandro Agudelo Serna; Yohana Marcela López Rivera

    2018-01-01

    En el presente artículo se estudia el proceso de gestión de inventarios por medio de la dinámica de sistemas, como herramienta metodológica que permite conocer el comportamiento de las variables de acuerdo a sus relaciones y a las decisiones que se tomen teniendo en cuenta su causalidad y realimentación. El desarrollo del documento está determinado por una revisión de conceptos teóricos relacionados con la gestión de inventarios y dinámica de sistemas, seguido por una revisión de lit...

  8. Steel: Price and Policy Issues

    National Research Council Canada - National Science Library

    Cooney, Stephen

    2006-01-01

    Steel prices remain at historically elevated levels. The rapid growth of steel production and demand in China is widely considered as a major cause of the increases in both steel prices and the prices of steelmaking inputs...

  9. A novel cis-acting element required for DNA damage-inducible expression of yeast DIN7

    International Nuclear Information System (INIS)

    Yoshitani, Ayako; Yoshida, Minoru; Ling Feng

    2008-01-01

    Din7 is a DNA damage-inducible mitochondrial nuclease that modulates the stability of mitochondrial DNA (mtDNA) in Saccharomyces cerevisiae. How DIN7 gene expression is regulated, however, has remained largely unclear. Using promoter sequence alignment, we found a highly conserved 19-bp sequence in the promoter regions of DIN7 and NTG1, which encodes an oxidative stress-inducible base-excision-repair enzyme. Deletion of the 19-bp sequence markedly reduced the hydroxyurea (HU)-enhanced DIN7 promoter activity. In addition, nuclear fractions prepared from HU-treated cells were used in in vitro band shift assays to reveal the presence of currently unidentified trans-acting factor(s) that preferentially bound to the 19-bp region. These results suggest that the 19-bp sequence is a novel cis-acting element that is required for the regulation of DIN7 expression in response to HU-induced DNA damage

  10. Hydrogen permeation rate reduction by post-oxidation of aluminide coatings on DIN 1.4914 martensitic steel (MANET)

    International Nuclear Information System (INIS)

    Perujo, A.; Sample, T.

    1996-01-01

    In a previous work, it has been shown that lower aluminium content aluminide, having the same permeation rate reduction as the higher aluminium content, exhibited a lower hardness and greater ductility and therefore greater crack resistance than the higher aluminium content. In this work we combine this characteristic with a post-oxidation to obtain a further deuterium permeation reduction. The post-oxidation was performed in air at 1023 K for 15 h and at 1223 K for 10 h and 1 h. The maximum deuterium permeation rate reduction obtained is very moderate (maximum of a factor 500 for 1 h at 1223 K) as compared to that of the non-oxidised aluminide specimen (two orders of magnitude) and is constant in the temperature range studied (573-800 K). This method has the technological appeal of using air rather than the controlled environment used by other authors. (orig.)

  11. The formation of hydrogen permeation barriers on steels by aluminising

    Science.gov (United States)

    Forcey, K. S.; Ross, D. K.; Wu, C. H.

    1991-06-01

    An extensive investigation has been carried out into the effectiveness of aluminised layers as permeation barriers on AISI 316L stainless and DIN 1.4914 martensitic steels. The study involved measurement of the hydrogen permeation rate through commercially aluminised steel discs of thicknesses in the range 1-1.6 mm, at temperatures between 250 and 600 °C and for an upstream hydrogen pressure of 10 5 Pa. The composition and structure of the aluminide layers were investigated by a number of techniques such as SEM, electron beam microprobe and X-ray diffraction. Accelerator based techniques such as RBS and NRA were employed to study the top micron or so of the surfaces of the samples. By these techniques it was found that the effectiveness of the permeation barrier depended on the formation of a thin surface oxide layer consisting of Al 2O 3. It was found that the permeation rate through the aluminised steels could be reduced by 3-4 orders of magnitude by forming a surface oxide layer up to a micron or so in thickness.

  12. Monitoring of Fatigue Degradation in Austenitic Stainless Steels

    International Nuclear Information System (INIS)

    Kalkhof, D.; Niffenegger, M.; Leber, H.J.

    2004-01-01

    During cyclic loading of austenitic stainless steel, it was observed that microstructural changes occurred; these affect both the mechanical and physical properties of the material. For certain steels, a strain-induced martensite phase transformation was seen. The investigations showed that, for the given material and loading conditions, the volume fraction of martensite depends on the cycle number, temperature and initial material state. It was also found that the martensite content continuously increased with the cycle number. Therefore, the volume fraction of martensite was used as an indication of fatigue usage. It was noted that the temperature dependence of the martensite formation could be described by a Boltzmann function, and that the martensite content decreased with increasing temperature. Two different heats of the austenitic stainless steel X6CrNiTi18-10 (AISI 321, DIN 1.4541) were investigated. It was found that the martensite formation rate was much higher for the cold-worked than for the solution-annealed material. All applied techniques - neutron diffraction and advanced magnetic methods - were successful in detecting the presence of martensite in the differently fatigued specimens. (author)

  13. Fundamentos e métodos de medidas de energia dinâmica no SPT

    Directory of Open Access Journals (Sweden)

    Antonio Belincanta

    2000-05-01

    Full Text Available Discutem-se neste trabalho os métodos disponíveis no Brasil e no exterior para a medida da energia transferida às hastes no SPT, apresentando-se inclusive registros típicos dos eventos dinâmicos correspondentes

  14. Connection and Community: Diné College Emphasizes Real-World Experience in Public Health

    Science.gov (United States)

    Bauer, Mark

    2016-01-01

    The Summer Research Enhancement Program (SREP) at Diné College provides students with a solid foundation of public health research methods and includes a hands-on internship in their home community to test their newly acquired skills while enhancing the communities' health. Focusing on health issues prioritized by Navajo health leaders, from…

  15. Dinámica de sistemas en la gestión de inventarios

    Directory of Open Access Journals (Sweden)

    Daniel Alejandro Agudelo Serna

    2018-02-01

    Full Text Available En el presente artículo se estudia el proceso de gestión de inventarios por medio de la dinámica de sistemas, como herramienta metodológica que permite conocer el comportamiento de las variables de acuerdo a sus relaciones y a las decisiones que se tomen teniendo en cuenta su causalidad y realimentación. El desarrollo del documento está determinado por una revisión de conceptos teóricos relacionados con la gestión de inventarios y dinámica de sistemas, seguido por una revisión de literatura, en donde se analizan modelos dinámicos que relacionan las variables que afectan directa o indirectamente al inventario, resaltando la importancia de modelos robustos que permitan obtener mejores resultados y así poder establecer políticas de gestión y control del inventario. El objetivo fundamental es presentar una revisión de los modelos dinámicos relacionados con el inventario, en donde es posible observar los diagramas causales y de Forrester, variables, criterios y parámetros que influyen en cada uno de los sistemas presentados. Se supone una metodología basada en la búsqueda de información, para posteriormente desarrollar un análisis detallado de cada modelo encontrado.

  16. The reactor vessel steels

    International Nuclear Information System (INIS)

    Bilous, W.; Hajewska, E.; Szteke, W.; Przyborska, M.; Wasiak, J.; Wieczorkowski, M.

    2005-01-01

    In the paper the fundamental steels using in the construction of pressure vessel water reactor are discussed. The properties of these steels as well as the influence of neutron irradiation on its degradation in the time of exploitation are also done. (authors)

  17. Steel Industry Wastes.

    Science.gov (United States)

    Schmidtke, N. W.; Averill, D. W.

    1978-01-01

    Presents a literature review of wastes from steel industry, covering publications of 1976-77. This review covers: (1) coke production; (2) iron and steel production; (3) rolling operations; and (4) surface treatment. A list of 133 references is also presented. (NM)

  18. Regulated expression of the dinR and recA genes during competence development and SOS induction in Bacillus subtilis

    NARCIS (Netherlands)

    Haijema, BJ; vanSinderen, D; Winterling, K; Kooistra, J; Venema, G; Hamoen, LW

    1996-01-01

    It has been hypothesized that the dinR gene product of Bacillus subtilis acts as a repressor of the SOS regulon by binding to DNA sequences located upstream of SOS genes, including dinR and recA. Following activation as a result of DNA damage, RecA is believed to catalyse DinR-autocleavage, thus

  19. Multiple pathways for SOS-induced mutagenesis in Escherichia coli: An overexpression of dinB/dinP results in strongly enhancing mutagenesis in the absence of any exogenous treatment to damage DNA

    Science.gov (United States)

    Kim, Su-Ryang; Maenhaut-Michel, Geneviéve; Yamada, Masami; Yamamoto, Yoshihiro; Matsui, Keiko; Sofuni, Toshio; Nohmi, Takehiko; Ohmori, Haruo

    1997-01-01

    dinP is an Escherichia coli gene recently identified at 5.5 min of the genetic map, whose product shows a similarity in amino acid sequence to the E. coli UmuC protein involved in DNA damage-induced mutagenesis. In this paper we show that the gene is identical to dinB, an SOS gene previously localized near the lac locus at 8 min, the function of which was shown to be required for mutagenesis of nonirradiated λ phage infecting UV-preirradiated bacterial cells (termed λUTM for λ untargeted mutagenesis). A newly constructed dinP null mutant exhibited the same defect for λUTM as observed previously with a dinB::Mu mutant, and the defect was complemented by plasmids carrying dinP as the only intact bacterial gene. Furthermore, merely increasing the dinP gene expression, without UV irradiation or any other DNA-damaging treatment, resulted in a strong enhancement of mutagenesis in F′lac plasmids; at most, 800-fold increase in the G6-to-G5 change. The enhanced mutagenesis did not depend on recA, uvrA, or umuDC. Thus, our results establish that E. coli has at least two distinct pathways for SOS-induced mutagenesis: one dependent on umuDC and the other on dinB/P. PMID:9391106

  20. On the Cutting Performance of Coated HSS Taps When Machining of Austenitic Steel

    Science.gov (United States)

    Sliwkova, Petra; Piska, Miroslav

    2014-12-01

    The paper deals with a quality of the PVD coated HSS taps when cutting the stainless austenitic chromiumnickel non-stabilized steel DIN 1.4301 (X5CrNi 18-10). The main attention is focused on the analysis of loading (cutting moment, specific energy) of the HSS taps by means of pieso-electrical dynamometer Kistler 9272 and the relation between the quality of duplex and triplex PVD coatings and their effects on the quality of machined thread surfaces and tool life of the taps. The results showed a safe and stabilized cutting with acceptable quality of threads for HSSE with the TiN+TiCN+DLC coating.

  1. Seasonal and multi-year surface displacements measured by DInSAR in a High Arctic permafrost environment

    Science.gov (United States)

    Rudy, Ashley C. A.; Lamoureux, Scott F.; Treitz, Paul; Short, Naomi; Brisco, Brian

    2018-02-01

    Arctic landscapes undergo seasonal and long-term changes as the active layer thaws and freezes, which can result in localized or irregular subsidence leading to the formation of thermokarst terrain. Differential Interferometric Synthetic Aperture Radar (DInSAR) is a technique capable of measuring ground surface displacements resulting from thawing permafrost at centimetre precision and is quickly gaining acceptance as a means of measuring ground displacement in permafrost regions. Using RADARSAT-2 stacked DInSAR data from 2013 and 2015 we determined the magnitude and patterns of land surface change in a continuous permafrost environment. At our study site situated in the Canadian High Arctic, DInSAR seasonal ground displacement patterns were consistent with field observations of permafrost degradation. As expected, many DInSAR values are close to the detection threshold (i.e., 1 cm) and therefore do not indicate significant change; however, DInSAR seasonal ground displacement patterns aligned well with climatological and soil conditions and offer geomorphological insight into subsurface processes in permafrost environments. While our dataset is limited to two years of data representing a three-year time period, the displacements derived from DInSAR provide insight into permafrost change in a High Arctic environment and demonstrate that DInSAR is an applicable tool for understanding environmental change in remote permafrost regions.

  2. DinB Upregulation Is the Sole Role of the SOS Response in Stress-Induced Mutagenesis in Escherichia coli

    Science.gov (United States)

    Galhardo, Rodrigo S.; Do, Robert; Yamada, Masami; Friedberg, Errol C.; Hastings, P. J.; Nohmi, Takehiko; Rosenberg, Susan M.

    2009-01-01

    Stress-induced mutagenesis is a collection of mechanisms observed in bacterial, yeast, and human cells in which adverse conditions provoke mutagenesis, often under the control of stress responses. Control of mutagenesis by stress responses may accelerate evolution specifically when cells are maladapted to their environments, i.e., are stressed. It is therefore important to understand how stress responses increase mutagenesis. In the Escherichia coli Lac assay, stress-induced point mutagenesis requires induction of at least two stress responses: the RpoS-controlled general/starvation stress response and the SOS DNA-damage response, both of which upregulate DinB error-prone DNA polymerase, among other genes required for Lac mutagenesis. We show that upregulation of DinB is the only aspect of the SOS response needed for stress-induced mutagenesis. We constructed two dinB(oc) (operator-constitutive) mutants. Both produce SOS-induced levels of DinB constitutively. We find that both dinB(oc) alleles fully suppress the phenotype of constitutively SOS-“off” lexA(Ind−) mutant cells, restoring normal levels of stress-induced mutagenesis. Thus, dinB is the only SOS gene required at induced levels for stress-induced point mutagenesis. Furthermore, although spontaneous SOS induction has been observed to occur in only a small fraction of cells, upregulation of dinB by the dinB(oc) alleles in all cells does not promote a further increase in mutagenesis, implying that SOS induction of DinB, although necessary, is insufficient to differentiate cells into a hypermutable condition. PMID:19270270

  3. Damascus steel ledeburite class

    Science.gov (United States)

    Sukhanov, D. A.; Arkhangelsky, L. B.; Plotnikova, N. V.

    2017-02-01

    Discovered that some of blades Damascus steel has an unusual nature of origin of the excess cementite, which different from the redundant phases of secondary cementite, cementite of ledeburite and primary cementite in iron-carbon alloys. It is revealed that the morphological features of separate particles of cementite in Damascus steels lies in the abnormal size of excess carbides having the shape of irregular prisms. Considered three hypotheses for the formation of excess cementite in the form of faceted prismatic of excess carbides. The first hypothesis is based on thermal fission of cementite of a few isolated grains. The second hypothesis is based on the process of fragmentation cementite during deformation to the separate the pieces. The third hypothesis is based on the transformation of metastable cementite in the stable of angular eutectic carbide. It is shown that the angular carbides are formed within the original metastable colony ledeburite, so they are called “eutectic carbide”. It is established that high-purity white cast iron is converted into of Damascus steel during isothermal soaking at the annealing. It was revealed that some of blades Damascus steel ledeburite class do not contain in its microstructure of crushed ledeburite. It is shown that the pattern of carbide heterogeneity of Damascus steel consists entirely of angular eutectic carbides. Believe that Damascus steel refers to non-heat-resistant steel of ledeburite class, which have similar structural characteristics with semi-heat-resistant die steel or heat-resistant high speed steel, differing from them only in the nature of excess carbide phase.

  4. Nuevos modelos de redes de neuronas artificiales para simulación y control desistemas dinámicos

    OpenAIRE

    Galván León, Inés María

    1997-01-01

    Uno de los principales problemas en el campo de los procesos dinámicos es el control de su comportamiento, control que es necesario para que la evolución del proceso se lleve a cabo en una dirección y con una cierta dinámica deseada. Esto puede traducirse en mantener una condición estable, seguir una trayectoria especificada o alcanzar una determinada meta. Para ello es necesario incluir un sistema de control, el cual influye en la dinámica del proceso, regulando su comportamiento. La teoría...

  5. Temas de Física para Ingeniería: Dinámica del punto material

    OpenAIRE

    Beléndez, Augusto; Pastor Antón, Carlos; Bernabeu, Guillermo

    1988-01-01

    Apuntes de Mecánica: "Dinámica del punto material". Introducción, dinámica del punto. Fuerzas en la naturaleza. Sistemas de referencia. Leyes de Newton. Fuerzas de rozamiento. Ley de la gravitación universal. Aplicación de las leyes de Newton a la resolución de problemas de dinámica. Momento lineal y conservación. Redefinición de fuerza. Momento angular y conservación, fuerzas centrales. Impulso mecánico.

  6. Una propuesta metodológica para extraer factores comunes dinámicos estacionales y no estacionarios

    OpenAIRE

    Orozco Sánchez, María Camila

    2013-01-01

    Este trabajo presenta una metodóloga empírica que permite extraer factores comunes dinámicos estacionales y no estacionarios, basados en el análisis factorial dinámico estacional de Nieto et al. (2013), en el análisis factorial dinámico de Peña y Poncela (2006) y en el modelo de estacionalidad común en diferentes frecuencias planteado por Busetti (2006). La metodología propuesta es aplicada a nueve series de la macroeconomía Colombiana

  7. [Reform of the Law DIN EN ISO 9001:2000. Commentary on the new requirements on quality management systems].

    Science.gov (United States)

    Eckert, H; Böhmer, K

    2000-09-01

    Since January this year the German translation of the third draft to the reform of the DIN EN ISO 9000 is available. The draft reveals an approximation to the models of Business Excellence. Most important changes are a far stronger customer orientation, orientation on the processes and resource management. The norms DIN EN ISO 9002 and 9003 have been removed, ISO 8402 has been integrated in the reformed DIN EN ISO 9000. Apart from that the compatibility with other management systems has been improved. It was the aim of the reform to improve the applicability for all types of business, products and services.

  8. Structural amorphous steels

    International Nuclear Information System (INIS)

    Lu, Z.P.; Liu, C.T.; Porter, W.D.; Thompson, J.R.

    2004-01-01

    Recent advancement in bulk metallic glasses, whose properties are usually superior to their crystalline counterparts, has stimulated great interest in fabricating bulk amorphous steels. While a great deal of effort has been devoted to this field, the fabrication of structural amorphous steels with large cross sections has remained an alchemist's dream because of the limited glass-forming ability (GFA) of these materials. Here we report the discovery of structural amorphous steels that can be cast into glasses with large cross-section sizes using conventional drop-casting methods. These new steels showed interesting physical, magnetic, and mechanical properties, along with high thermal stability. The underlying mechanisms for the superior GFA of these materials are discussed

  9. European development of ferritic-martensitic steels for fast reactor wrapper applications

    International Nuclear Information System (INIS)

    Bagley, K.; Little, E.A.; Levy, V.; Alamo, A.

    1987-01-01

    9-12%Cr ferritic-martensitic stainless steels are under development in Europe for fast reactor sub-assembly wrapper applications. Within this class of alloys, attention is focussed on three key specifications, viz. FV448 and DIN 1.4914 (both 10-12%CrMoVNb steels) and EM10 (an 8-10%Cr-0.15%C steel), which can be optimized to give acceptably low ductile-brittle transition characteristics. The results of studies on these steels, and earlier choices, covering heat treatment and compositional optimization, evolution of wrapper fabrication routes, pre and post-irradiation mechanical property and fracture toughness behaviour, microstructural stability, void swelling and in-reactor creep characteristics are reviewed. The retention of high void swelling to displacement doses in excess of 100 dpa in reactor irradiations reaffirms the selection of 9-12%Cr steels for on-going wrapper development. Moreover, irradiation-induced changes in mechanical properties (e.g. in-reactor creep and impact behaviour), measured to intermediate doses, do not give cause for concern; however, additional data to higher doses and at the lower irradiation temperatures of 370 0 -400 0 C are needed in order to fully endorse these alloys for high burnup applications in advanced reactor systems

  10. Performance Steel Castings

    Science.gov (United States)

    2012-09-30

    system components to be built. Figure la shows the machine design . PSC-2012 Page 94 Glue Application Sheet Transfer Feed Elevator Figure la...Department of Defense such as cleats, ejection chutes , control arms, muzzle brakes, mortar components, clevises, tow bar clamps, ammo conveyor elements...Foundry and the members of Steel Founders’ Society of America. Abstract Weapon system designers and builders need advanced steel casting technology

  11. Life after Steel

    Science.gov (United States)

    Mangan, Katherine

    2013-01-01

    Bobby Curran grew up in a working-class neighborhood in Baltimore, finished high school, and followed his grandfather's steel-toed bootprints straight to Sparrows Point, a 3,000-acre sprawl of industry on the Chesapeake Bay. College was not part of the plan. A gritty but well-paying job at the RG Steel plant was Mr. Curran's ticket to a secure…

  12. Trayectorias evolucionistas en la dinámica de la empresa: una aproximación por dinámica de sistemas

    Directory of Open Access Journals (Sweden)

    Germán Eduardo Vargas

    2006-05-01

    Full Text Available La actividad de las firmas, como unidad socioeconómica, en el marco evolucionista está orientada integralmente por procesos de identidad, cohesión y mecanismos de adaptación y evolución; en este orden, el presente documento ilustra, a través de un modelo por dinámica de sistemas, cómo la orientación e integración estratégica basada en el conocimiento para la innovación se constituye como un imperativo de desarrollo que, a partir de un pequeño apalancamiento, permite distinguir entre dos trayectorias de evolución, a saber: firmas económicas tradicionales (inerciales, pues introducen mejoras incrementales esporádicas y modernas (dinámicas y radicalmente innovadoras, hecho a partir del cual se obtienen reveladoras conclusiones y desafíos para intervenir y adecuar el comportamiento de las empresas.2

  13. "We're still in a struggle": Diné resilience, survival, historical trauma, and healing.

    Science.gov (United States)

    Goodkind, Jessica R; Hess, Julia Meredith; Gorman, Beverly; Parker, Danielle P

    2012-08-01

    As part of a community/university collaborative effort to promote the mental health and well-being of Diné (Navajo) youth, we explored the relevance of addressing historical trauma and current structural stressors, and of building on individual and community strengths through healing and social transformation at multiple levels. Qualitative analyses of 74 ethnographic interviews with 37 Diné youth, parents, and grandparents suggested that a focus on historical trauma as a conceptual frame for behavioral health inequities, understood within the context of resilience and survival, is appropriate. Our findings also highlight the salience of current stressors such as poverty and violence exposure. We explore the fit of an historical trauma healing framework and present implications for intervention and transformation through revitalization of traditional knowledge, culturally based healing practices, intergenerational education, and social change strategies designed to eliminate social inequities.

  14. Dinámica exportadora de las empresas born global en Colombia

    Directory of Open Access Journals (Sweden)

    Diana Marcela Escandón Barbosa

    2015-11-01

    Full Text Available Este artículo pretende analizar las condiciones principales del mercado exportador de las empresas born global en el caso colombiano, teniendo en cuenta los principales factores del entorno que determinan su dinámica exportadora. Se utiliza la base de datos GEM Colombia del año 2011, para analizar 297 empresas born global colombianas, mediante un análisis descriptivo y la estimación de un modelo de conglomerados bietápico. Los resultados muestran que los cambios tecnológicos, las características sectoriales y la intensidad competitiva son factores determinantes de la dinámica exportadora de las empresas born global en Colombia, y se concluye que los empresarios se adaptan al mercado internacional mejorando continuamente sus productos y procesos.

  15. A dinâmica do crédito no Brasil entre 1990-2006.

    Directory of Open Access Journals (Sweden)

    Juliano Morais Galle

    2008-05-01

    Full Text Available Este artigo aborda, dentro de um contexto de globalização financeira, a dinâmica e o desenvolvimento recente do mercado financeiro e de crédito no Brasil. É mostrado que a dinâmica do crédito se caracterizou por três fases distintas entre 1990 e 2003. Além disso, discute-se que, após a implantação do Plano Real, houve um grande esforço por parte do governo brasileiro em reestruturar e reforçar o Sistema Financeiro Nacional, e que a conjuntura econômica observada atualmente no Brasil é bem mais favorável ao crescimento da relação crédito/PIB que no início da década de 2000.

  16. Insuficiencia dinámica, crecimiento y desempleo en México, 1974-2012

    OpenAIRE

    Blanca L. Avendaño Vargas; Ignacio Perrotini Hernández

    2015-01-01

    El artículo presenta una reformulación de la hipótesis de insuficiencia dinámica de Prebisch (1970), analiza la teoría dinámica de Harrod (1939), la ley Kaldor-Verdoorn (Kaldor, 1966; 1967) y la teoría del crecimiento endógeno de Thirlwall (1969; 2000). A posterioriestudiamos los determinantes del crecimiento económico y del desempleo en México durante el periodo 1974-2012. Con base en el análisis empírico, sostenemos que una baja tasa de acumulación genera una reducida absorción de empleo, u...

  17. Análise do comportamento dinâmico em pontes pedonais

    OpenAIRE

    Valentim, Nilton Leonardo

    2012-01-01

    Dissertação para obtenção do Grau de Mestre em Engenharia Civil - Perfil Estruturas A análise do comportamento dinâmico de estruturas de engenharia civil tem um interesse evidente para a avaliação dos efeitos das acções de sismos, vento e tráfego ferroviário, rodoviário ou pedonal. O interesse desta avaliação estende-se também à própria caracterização global do estado das estruturas, uma vez que as propriedades dinâmicas estão directamente relacionadas com esse estado. Pa...

  18. Microstructure and intergranular corrosion of the austenitic stainless steel 1.4970

    International Nuclear Information System (INIS)

    Terada, Maysa; Saiki, Mitiko; Costa, Isolda; Padilha, Angelo Fernando

    2006-01-01

    The precipitation behaviour of the DIN 1.4970 steel and its effect on the intergranular corrosion resistance were studied. Time-temperature-precipitation diagrams for the secondary phases (Ti, Mo)C (Cr, Fe, Mo, Ni) 23 C 6 and (Cr, Fe) 2 B are presented and representative samples have been selected for corrosion studies. The susceptibility to intergranular corrosion of the samples was evaluated using the double loop electrochemical potentiokinetic reactivation technique. The results showed that the solution-annealed samples and those aged at 1173 K did not present susceptibility to intergranular corrosion, whereas aging treatment from 873 to 1073 K resulted in small susceptibility to intergranular attack that decreased with aging temperature. The preferential formation of (Ti, Mo)C at higher aging temperatures comparatively to M 23 C 6 , retained the chromium in solid solution preventing steel sensitization and, consequently, intergranular corrosion

  19. A microstructural comparison of two nuclear-grade martensitic steels using small-angle neutron scattering

    Science.gov (United States)

    Coppola, R.; Fiori, F.; Little, E. A.; Magnani, M.

    1997-06-01

    Results are presented of a small-angle neutron scattering (SANS) study on two 10-13% Cr martensitic stainless steels of interest for nuclear applications, viz. DIN 1.4914 (MANET specification, for fusion reactors) and AISI 410. The investigation has focussed principally on microstructural effects associated with the differences in chromium content between the two alloys. The size distribution functions determined from nuclear and magnetic SANS components for the two steels given identical heat treatments are in accord with an interpretation based on the presence of ˜ 1 nm size CCr aggregates in the microstructure. Much larger (˜ 10 nm) scattering inhomogeneities with different magnetic contrast are also present and tentatively identified as carbides.

  20. Determination of organic fluorine in aqueous samples with neutron activation analysis in comparison with the DIN method

    Energy Technology Data Exchange (ETDEWEB)

    Rollinger, D. [Institut fuer Kernchemie, Universitaet Mainz, Fritz-Strassmann-Weg 2, D-55099 Mainz (Germany); Kratz, K.L. [Institut fuer Kernchemie, Universitaet Mainz, Fritz-Strassmann-Weg 2, D-55099 Mainz (Germany)

    1996-04-01

    Neutron activation analysis (NAA) has been used as detection technique for adsorbable organic fluorine in aqueous samples. The results have been compared with the standardized DIN method which uses a fluoride-ion-selective electrode (ISE). (orig.). With 3 tabs.

  1. Modelizaciones Dinámicas en Matemáticas. Usos del Geogebra

    Directory of Open Access Journals (Sweden)

    Isabel Álvarez García-Mon

    2012-04-01

    Full Text Available El CD-ROM “Modelizaciones Dinámicas en Matemáticas. Usos del GeoGebra” es un material destinado a profesores de Matemáticas de Educación Secundaria y Bachillerato. Consta de once proyectos diferentes sobre modelización matemática, en los que, utilizando el software GeoGebra, se resuelven problemas matemáticos basados en situaciones del mundo real.

  2. A Comparison of Effective Tension Calculation for Design Belt Conveyor between CEMA and DIN Standard

    Directory of Open Access Journals (Sweden)

    Satria Iman

    2018-01-01

    Full Text Available In the present era, many industries are demanding material transfer equipment that works maximally and cheaply. Belt Conveyor is one of the most efficient material transfer equipment compared to heavy equipment or other transportation equipment, because it can transport the material in large capacity. When designing conveyor belts, many industries want large transport capacity at low cost. One of the cost savings can be done with low motor power consumption. Many standards describe the effective tension calculation on the conveyor belt in detail with the parameters, since the effective tension calculation results are essential for determining motor power. This paper aims to analyze the effective tension on conveyor belts using CEMA 5th, CEMA 6th and DIN 22101 standards with case studies of 1000 TPH carrying capacity and 3 m/s conveyor speed. The difference between CEMA and DIN when determining the effective tension is on the use of coefficient of friction, because DIN uses a global coefficient of friction while CEMA uses different friction coefficients on idler, belt and material. This difference in coefficient of friction results in different ways of calculating the resistance being the accumulation of the effective tension. The result is an effective tension value using DIN 22101 standard of 22,148.16 N with motor power consumption of 66.5 kW, while effective tension value using CEMA 5th standard is 32.201.66 N with motor power consumption 96.47 kW, and effective tension value using CEMA 6th standard is 29,686.48 N with 89.06 kW motor power consumption.

  3. Influencia del modelo elástico en la dinámica de estructuras articuladas

    OpenAIRE

    Muñoz, M.; López-Hernández, E.

    1997-01-01

    Se estudia la influencia en la dinámica de una estructura articulada de barras de madera, de la aproximación a las propiedades tensión-deformación del material. Se ha adoptado un método de cálculo por diferencias finitas en el dominio del tiempo, con un modelo de masas concentradas en los nodos.

  4. Dinâmica populacional da mariposa oriental em pomares de pessegueiro e ameixeira

    Directory of Open Access Journals (Sweden)

    Hickel Eduardo Rodrigues

    2003-01-01

    Full Text Available O objetivo deste trabalho foi estudar a dinâmica populacional da mariposa oriental [Grapholita molesta (Busk] em pomares de pessegueiro e ameixeira. Os adultos foram monitorados em dois pomares de pessegueiro e um de ameixeira por cinco anos. Séries temporais equivalentes de temperaturas máximas e mínimas foram correlacionadas aos dados de flutuação populacional para se aferir a correspondência entre a ocorrência da praga e as flutuações de temperatura. A análise de Fourier das séries temporais das armadilhas de coleta de mariposas revelou dinâmicas cíclicas, com período principal médio de 53,91 semanas. Um período menor médio, de 7,45 semanas, também ficou evidente e se aproxima do tempo médio de geração do inseto. A análise do espectro de potência das séries temporais, com e sem periodicidade, revelou que a dinâmica populacional de G. molesta possui um componente regular, caracterizado pelos períodos observados, e outro componente irregular, reminiscente de ruído 1/f, caracterizado pelas variações de amplitude, aparentemente irregulares, na ocorrência do inseto. A combinação desses dois componentes ocasiona um processo com domínio de baixas freqüências, próprio das dinâmicas periódicas ruidosas. Os ciclos de aparecimento da praga ocorrem em fase com os ciclos de flutuação de temperaturas máximas e mínimas.

  5. Effects of different N sources on riverine DIN export and retention in a subtropical high-standing island, Taiwan

    Science.gov (United States)

    Huang-Chuan, Jr.; Lee, Tsung-Yu; Lin, Teng-Chiu; Hein, Thomas; Lee, Li-Chin; Shih, Yu-Ting; Kao, Shuh-Ji; Shiah, Fuh-Kwo; Lin, Neng-Huei

    2016-03-01

    Increases in nitrogen (N) availability and mobility resulting from anthropogenic activities have substantially altered the N cycle, both locally and globally. Taiwan characterized by the subtropical montane landscape with abundant rainfall, downwind of the most rapidly industrializing eastern coast of China, can be a demonstration site for extremely high N input and riverine DIN (dissolved inorganic N) export. We used 49 watersheds with similar climatic and landscape settings but classified into low, moderate, and highly disturbed categories based on population density to illustrate their differences in nitrogen inputs (through atmospheric N deposition, synthetic fertilizers, and human emission) and DIN export ratios. Our results showed that the island-wide average riverine DIN export is ˜ 3800 kg N km-2 yr-1, approximately 18 times the global average. The average riverine DIN export ratios are 0.30-0.51, which are much higher than the averages of 0.20-0.25 of large rivers around the world, indicating excessive N input relative to ecosystem demand or retention capacity. The low disturbed watersheds have a high N retention capacity and DIN export ratios of 0.06-0.18 in spite of the high N input (˜ 4900 kg N km-2 yr-1). The high retention capacity is likely due to effective uptake by secondary forests in the watersheds. The moderately disturbed watersheds show a linear increase in DIN export with increases in total N inputs and mean DIN export ratios of 0.20 to 0.31. The main difference in land use between low and moderately disturbed watersheds is the greater proportion of agricultural land cover in the moderately disturbed watersheds. Thus, their greater DIN export could be attributed to N fertilizers used in the agricultural lands. The greater export ratios also imply that agricultural lands have a lower proportional N retention capacity and that reforestation could be an effective land management practice to reduce riverine DIN export. The export ratios of the

  6. “We’re Still in a Struggle”: Diné Resilience, Survival, Historical Trauma, and Healing

    OpenAIRE

    Goodkind, Jessica R.; Hess, Julia Meredith; Gorman, Beverly; Parker, Danielle P.

    2012-01-01

    As part of a community/university collaborative effort to promote the mental health and well-being of Diné (Navajo) youth, we explored the relevance of addressing historical trauma and current structural stressors and of building on individual and community strengths through healing and social transformation at multiple levels. Qualitative analyses of 74 ethnographic interviews with 37 Diné youth, parents, and grandparents suggested that a focus on historical trauma as a conceptual frame for ...

  7. Analysis for Producing a Facsimile of the Cadastral Map of Varaždin

    Directory of Open Access Journals (Sweden)

    Mirko Husak

    2012-12-01

    Full Text Available This paper investigates and suggests methods for producing a facsimile of the 1 860 cadastral map of Varaždin. The methods used to produce the map, the coordinate systems, map contents, usage, maintenance and damage are described. Three samples from the map that display the elements of damage noted were researched, and the possibility of replacing damaged sections with undamaged sections using digital methods investigated. The sources available were the original cadastral colour map of Varaždin, along with the line art cadastral map and field cadastral sketches. The original colour and line art maps were scanned using the DeSkan Express scanning system for large formats. A flatbed UMAX Mirage II A3 scanner was used for scanning the field cadastral map. For the research image-processing, Adobe Photoshop CE 7.0 software was used, although it was primarily designed for processing photographs. The colour separation method was rejected from the start, since the map was made by hand. The paper discusses the possibility of copying and inserting missing parts from additional map sources, changing the colour of the paper to white or another colour, removing the map content added in red ink and lead pencil, and so on. The discussion is based on actual examples from the digital image. The conclusion suggests image-processing methods for achieving optimal results in producing a facsimile of the Varaždin cadastral map.Keywords: facsimile; cadastral map; map content; scanning; digital image processing

  8. DNA-damage-inducible (din) loci are transcriptionally activated in competent Bacillus subtilis

    International Nuclear Information System (INIS)

    Love, P.E.; Lyle, M.J.; Yasbin, R.E.

    1985-01-01

    DNA damage-inducible (din) operon fusions were generated in Bacillus subtilis by transpositional mutagenesis. These YB886(din::Tn917-lacZ) fusion isolates produced increased β-galactosidase when exposed to mitomycin C, UV radiation, or ethyl methanesulfonate, indicating that the lacZ structural gene had inserted into host transcriptional units that are induced by a variety of DNA-damaging agents. One of the fusion strains was DNA-repair deficient and phenotypically resembled a UV-sensitive mutant of B. subtilis. Induction of β-galactosidase also occurred in the competent subpopulation of each of the din fusion strains, independent of exposure to DNA-damaging agents. Both the DNA-damage-inducible and competence-inducible components of β-galactosidase expression were abolished by the recE4 mutation, which inhibits SOS-like (SOB) induction but does not interfere with the development of the component state. The results indicate that gene expression is stimulated at specific loci within the B. subtilis chromosome both by DNA-damaging agents and by the development of competence and that this response is under the control of the SOB regulatory system. Furthermore, they demonstrate that at the molecular level SOB induction and the development of competence are interrelated cellular events

  9. A dinâmica da gestão no contexto acadêmico

    Directory of Open Access Journals (Sweden)

    Nadi Helena Presser

    2011-09-01

    Full Text Available Apresenta um estudo da dinâmica da gestão, procurando avançar no assunto, a partir das constatações de Mintzberg (2001, 2010, desmistificando o gestor nas suas características convencionais prescritas pela teoria clássica de administração, denotado como um planejador sistemático, que trabalha de forma programada, sem interrupções, e possuidor de um controle amplo de seu trabalho na organização. O objeto empírico desta pesquisa estendeu sua ação no ambiente organizacional de um departamento universitário federal, no contexto da gestão acadêmica dos cursos de graduação e do programa de pós-graduação. Com apoio numa metodologia de pesquisa etnográfica e de entrevistas semiestruturadas, observou-se um ambiente de gestão caracterizado pela ambiguidade, por uma dinâmica acelerada de tarefas diversificadas. Conclui-se que as análises sobre a prática da gestão teriam a ganhar se procurassem perscrutar esta realidade. A premissa sobre a dinâmica da gestão defendida por Mintzberg encontra sustentação neste estudo, cuja essência é descrita muito mais como uma prática do que como uma ciência.

  10. Clean steels for fusion

    International Nuclear Information System (INIS)

    Gelles, D.S.

    1995-03-01

    Fusion energy production has an inherent advantage over fission: a fuel supply with reduced long term radioactivity. One of the leading candidate materials for structural applications in a fusion reactor is a tungsten stabilized 9% chromium Martensitic steel. This alloy class is being considered because it offers the opportunity to maintain that advantage in the reactor structure as well as provide good high temperature strength and radiation induced swelling and embrittlement resistance. However, calculations indicate that to obtain acceptable radioactivity levels within 500 years after service, clean steel will be required because the niobium impurity levels must be kept below about 2 appm and nickel, molybdenum, nitrogen, copper, and aluminum must be intentionally restricted. International efforts are addressing the problems of clean steel production. Recently, a 5,000 kg heat was vacuum induction melted in Japan using high purity commercial raw materials giving niobium levels less than 0.7 appm. This paper reviews the need for reduced long term radioactivity, defines the advantageous properties of the tungsten stabilized Martensitic steel class, and describes the international efforts to produce acceptable clean steels

  11. Steel fiber reinforced concrete

    International Nuclear Information System (INIS)

    Baloch, S.U.

    2005-01-01

    Steel-Fiber Reinforced Concrete is constructed by adding short fibers of small cross-sectional size .to the fresh concrete. These fibers reinforce the concrete in all directions, as they are randomly oriented. The improved mechanical properties of concrete include ductility, impact-resistance, compressive, tensile and flexural strength and abrasion-resistance. These uniqlte properties of the fiber- reinforcement can be exploited to great advantage in concrete structural members containing both conventional bar-reinforcement and steel fibers. The improvements in mechanical properties of cementitious materials resulting from steel-fiber reinforcement depend on the type, geometry, volume fraction and material-properties of fibers, the matrix mix proportions and the fiber-matrix interfacial bond characteristics. Effects of steel fibers on the mechanical properties of concrete have been investigated in this paper through a comprehensive testing-programme, by varying the fiber volume fraction and the aspect-ratio (Lid) of fibers. Significant improvements are observed in compressive, tensile, flexural strength and impact-resistance of concrete, accompanied by marked improvement in ductility. optimum fiber-volume fraction and aspect-ratio of steel fibers is identified. Test results are analyzed in details and relevant conclusions drawn. The research is finally concluded with future research needs. (author)

  12. Characterization of sensitization and stress corrosion cracking behavior of stabilized stainless steels under BWR conditions

    International Nuclear Information System (INIS)

    Kilian, R.; Ilg, U.; Meier, V.; Teichmann, H.; Wachter, O.

    1995-01-01

    Stress corrosion cracking occurs if the three parameters -- material condition, tensile stress and water chemistry -- are in a critical range. In this study the material conditions especially of Ti- and Nb-stabilized steels are considered. The purpose of this work is to show the influence of the degree of sensitization of Ti- and Nb-stabilized stainless steels on stress corrosion cracking susceptibility in BWR water chemistry. This is an on-going research program. Preliminary results will be presented. Different types of stabilized, and for comparison unstabilized, stainless steels are examined in various heat treatment conditions with regard to their sensitization behavior by EPR tests (double loop) and TEM. The results are plotted in sensitization diagrams. The sensitization behavior depends on many parameters such as carbon content, stabilization element, stabilization ratio and materials history, e.g. solution heat treatment or cold working. The obtained EPR sensitization diagrams are compared with the well known sensitization diagrams from the literature, which were determined by standard IC test according to e.g. German standard DIN 50914 (equivalent to ASTM A 262, Pract. E). Based on the obtained EPR sensitization diagrams material conditions for SSRT tests were selected. The EPR values (Ir/Ia x 100%) of the tested Ti-stabilized stainless steel are in the range of ∼ 0.1--20%. The SSRT tests are carried out in high-temperature water with 0.4 ppm O 2 , a conductivity of 0.5 microS/cm and a strain rate of 1x10 -6-1 . The test temperature is 280 C. Ti-stabilized stainless steel with Ir/Ia x 100% > 1% suffered intergranular stress corrosion cracking under these conditions. The SCC tests for Nb-stabilized stainless steel are still in progress. The correlation between EPR value, chromium depletion and SSRT result will be shown for a selected material condition of sensitized Ti-stabilized stainless steel

  13. microstructure change in 12 % Cr steel during creep

    International Nuclear Information System (INIS)

    Winatapura, D. S.; Panjaitan, E.; Arslan, A.; Sulistioso, G.S.

    1998-01-01

    The microstructure change in steel containing of 12% Cr or DIN X20CrMoV 12 1 during creep has been studied by means of optical microscopy and Transmission Electron Microscope (TEM). The creep testing at 650 o C was conducted under constant load of 650 Mpa. The heat treatment of the specimen before creep testing was austenization, followed by tempering for 2 hours. The obtained microstructure was tempered martensitic. This microstructure consisted of the martensite laths, and distributed randomly in the matrix. During tempering, chromium carbide particles of Cr 7 C 6 less than 0,2 μmin-size were precipitated on or and in the subgrain and lath martensite grain boundary. During creep testing those particles transformed and precipitated as chrome carbide precipitates of Cr 23 C 6 . At the secondary creep stage, the void formation occurred, and then it developed into the creep cracks. At tertiary creep stage for 3554 hours, the specimen was failure. The creep cracks were informs of transgranular and intergranular modes which propagated almost perpendicular to the stress axis. From this observation, it is suggested that tempering caused the ductility of martensitic microstructure, which increased the creep resistant or Cr 12% steel

  14. Thermochemical surface engineering of steels

    DEFF Research Database (Denmark)

    Thermochemical Surface Engineering of Steels provides a comprehensive scientific overview of the principles and different techniques involved in thermochemical surface engineering, including thermodynamics, kinetics principles, process technologies and techniques for enhanced performance of steels...

  15. Cold formability of steels

    International Nuclear Information System (INIS)

    Lafond, G.; Leclerq, G.; Moliexe, F.; Namdar, R.; Roesch, L.; Sanz, G.

    1977-01-01

    This work was essentially aimed to the study of the following three questions. Is it possible to assess the cold formability of steels using simple material properties as criteria. What values of mechanical properties can one expect to reach in cold formed parts. Are there simple ways of characterizing the speroidization treatments carried out on steels before cold forming operations. The present report describes the results obtained during this investigation. It is logically divided into three separate parts. Experimental study of cold formability in wire drawing. Influence of metallurgical variables on mechanical properties of high carbon cold drawn wires. Contribution to the study of characterization methods of cold forming steels subjected to a spheroidization heat treatment

  16. Dinâmica não-linear e psiquiatria: a natureza dinâmica das doenças mentais

    Directory of Open Access Journals (Sweden)

    Fernando Portela Câmara

    2008-03-01

    Full Text Available A psiquiatria moderna adotou a postura reducionista de associar psicopatologia à fisiologia sináptica. Isto produziu avanços importantes na farmacoterapia dos transtornos mentais. Entretanto, a introdução de princípios da dinâmica não-linear promoveu uma mudança do enfoque sináptico para o enfoque das vias específicas patologicamente autônomas envolvidas nos fenômenos psicopatológicos. Esta tendência teve início nos anos 1990 e trouxe um conceito mais sistêmico de fisiopatologia e tratamento em psiquiatria.

  17. National steel tries wheeling

    International Nuclear Information System (INIS)

    Dudak, J.R.

    1992-01-01

    In 1989, National Steel felt the need to take the next step to make its Detroit-based division, Great Lakes Steel, more competitive in the world flat-rolled steel market. In 1988, Great Lakes Steel started flowing natural gas through the first fully litigated bypass (Competitive Sourcing Option) of a local distribution company. In 1989, the second connection with the new supply route for gas transportation, Panhandle Eastern had started flowing and the LDC, Michigan Consolidated Gas Co. (MichCon) had pulled out their piping previously serving the plants. Since we had been able to structure a fully reliable supply route, storage and balancing program for gas in the face of such strong opposition by the LDC, the author felt it was time to attack the next singularly sourced major commodity, electricity. Electricity, at this major integrated steel plant, represented approximately 7% of plant cost yearly. Yet being monopolized, Great Lakes Division (GLD) could not multiple source this commodity like it does with its other 93% of costs, except for labor (25% of the 93%). Multiple sourcing is done to bring competitive pressure to suppliers and to diversify supplies and protect plant operation in the event of failure by one supplier. This paper describes National Steel's strategy to reduce the cost of power, at the minimum of capital costs, the most expedient way possible, that does not sacrifice any major long-term potential cost improvements. The results show that competitively priced power is available across the mid-west, at prices well below many state regulated electric utilities, for at least 5 to 15 years, but with major obstacles in obtaining transmission access

  18. Detailed data set of a large administration building as a validation model for DIN V18599-software; Umfangreicher Validierungsdatensatz eines grossen Verwaltungsgebaeudes fuer Software zur DIN V 18599

    Energy Technology Data Exchange (ETDEWEB)

    Hoettges, Kirsten; Woessner, Simon; de Boer, Jan; Erhorn, Hans [Fraunhofer-Institut fuer Bauphysik (IBP), Abt. Energiesysteme, Kassel (Germany); Fraunhofer-Institut fuer Bauphysik (IBP), Stuttgart (Germany)

    2009-04-15

    The calculation method of DIN V 18599 represents a very complex model for the estimation of the energy efficiency of buildings. The method is used for certificates too, thus, the number of users is quite high. This fact and the complexity of the method causes high demands on the related software products. Most of the end user software tools work with the calculation engine ibp18599kernel developed by Fraunhofer-Institut for Building Physics. There is a continuous quality control for both, the kernel and the user interfaces, i.e. the end user software. This paper gives an overview of the process of quality control as well as a documentation of a validation model used within this process, i.e. a complex administration building as a sample. (Abstract Copyright [2009], Wiley Periodicals, Inc.) [German] Mit dem Berechnungsverfahren der DIN V 18599 liegt ein umfassendes Berechnungsmodell fuer die energetische Bewertung von Gebaeuden vor. Der grosse Umfang der Verfahren stellt auch an die softwaretechnischen Umsetzungen fuer die Planungspraxis hohe Anforderungen. Das Fraunhofer-Institut fuer Bauphysik hat hierzu den Rechenkern ibp18599kernel entwickelt, der zwischenzeit-lich von zahlreichen Softwarehaeusern fuer Endanwendungsprogramme zur energetischen Bewertung und Erstellung von Energieausweisen eingesetzt wird. Dieser ''Rechenmotor'' unterliegt einer steten Qualitaetskontrolle zur Sicherstellung der Berechnungsgenauigkeit. Der vorliegende Aufsatz stellt den Prozess der Qualitaetssicherung anhand eines neuen Validierungsbeispiels in Form eines komplexen Verwaltungsgebaeudes vor. Die Fallstudie kann auch zur Validierung anderer Berechnungssysteme, die nicht auf dem Rechenkern basieren, genutzt werden. (Abstract Copyright [2009], Wiley Periodicals, Inc.)

  19. EVALUAREA POTENŢIALULUI PATRIMONIAL AL ÎNTREPRINDERILOR ŞI ORGANIZAŢIILOR DIN SISTEMUL COOPERAŢIEI DE CONSUM DIN REPUBLICA MOLDOVA

    Directory of Open Access Journals (Sweden)

    Natalia CHIBERCEA

    2018-03-01

    Full Text Available În articol este efectuată o analiză a situaţiei financiar-patrimoniale a entităților economice din sistemul cooperației de consum din Republica Moldova, ceea ce a permis autorului să constate că aceasta indică o stare concretă a capitalului entității economice, reprezentând rezultatul realizării scopului activității întreprinderii. În mod particular, în urma desfăşurării reuşite a activităţii economico-financiare, se constată o creştere a activelor controlate de întreprindere, fapt ce reflectă extinderea activităţii de întreprinzător şi sporirea potenţialului economico-financiar.EVALUATION OF THE PATRIMONIAL POTENTIAL OF THE ENTERPRISES AND ORGANIZATIONS FROM THE CONSUMER COOPERATION SYSTEM OF THE REPUBLIC OF MOLDOVAThis article reflects the analysis of the financial-patrimonial situation of economic entities from the consumer coope­ration system of theRepublicofMoldova, which in general made possible to ascertain that this is a concrete state of the economic entity's capital, representing the result of achieving the purpose of the enterprise's activity. In particular, following the successful conduct of the economic and financial activity, there is an increase in the assets controlled by the enterprise, which reflects the widening of the entrepreneurial activity and increasing economic and financial potential.

  20. Volatilization from PCA steel alloy

    Energy Technology Data Exchange (ETDEWEB)

    Hagrman, D.L.; Smolik, G.R.; McCarthy, K.A.; Petti, D.A.

    1996-08-01

    The mobilizations of key components from Primary Candidate Alloy (PCA) steel alloy have been measured with laboratory-scale experiments. The experiments indicate most of the mobilization from PCA steel is due to oxide formation and spalling but that the spalled particles are large enough to settle rapidly. Based on the experiments, models for the volatization of iron, manganese, and cobalt from PCA steel in steam and molybdenum from PCA steel in air have been derived.

  1. Fatigue damage of steel components

    DEFF Research Database (Denmark)

    Fæster, Søren; Zhang, Xiaodan; Huang, Xiaoxu

    2014-01-01

    Railway rails and the inner ring in roller bearings in wind turbines are both experiencing steel-to-steel contact in small areas with huge loads resulting in extremely high stresses in the base materials......Railway rails and the inner ring in roller bearings in wind turbines are both experiencing steel-to-steel contact in small areas with huge loads resulting in extremely high stresses in the base materials...

  2. Thermally Stable Nanocrystalline Steel

    Science.gov (United States)

    Hulme-Smith, Christopher Neil; Ooi, Shgh Woei; Bhadeshia, Harshad K. D. H.

    2017-10-01

    Two novel nanocrystalline steels were designed to withstand elevated temperatures without catastrophic microstructural changes. In the most successful alloy, a large quantity of nickel was added to stabilize austenite and allow a reduction in the carbon content. A 50 kg cast of the novel alloy was produced and used to verify the formation of nanocrystalline bainite. Synchrotron X-ray diffractometry using in situ heating showed that austenite was able to survive more than 1 hour at 773 K (500 °C) and subsequent cooling to ambient temperature. This is the first reported nanocrystalline steel with high-temperature capability.

  3. Joining uranium to steel

    International Nuclear Information System (INIS)

    Perkins, M.A.

    1976-05-01

    A method has been devised which will allow the joining of uranium to steel by fusion welding through the use of an intermediate material. Uranium-0.5 titanium was joined to AISI 304L stainless steel by using a vanadium insert. Also, a method is now available for selecting possible filler metals when two entirely dissimilar metals need to be joined. This method allows a quantitative ranking to be made of the possible filler metals and thus the most likely candidate can be selected

  4. Innovations in the Poetry Form by Sheikh Sa'd od-Din Ahmad Ansari

    Directory of Open Access Journals (Sweden)

    Najaf Jowkar

    2016-05-01

    Full Text Available AbstractSheikh Sa'd od-Din Ahmad َ Ansari, the son of Mawlana Abd ol-Ghaffar Ibn Abd ol-Karim, is a mystic of the 12th and 13th centuries AH. Sa'd od-Din was born in Kabul in the village called Yahya Yahyaee in 1140 AH and died in the same place in 1225 AH (Ansari, 1374: 6. In his youth, he learned canonical law and theology from his father but was soon attracted to mysticism (Heravi, 1373, 43. After performing Hajj in between the years 1169-113 AH and getting permission to guide people from Naqshbandiyeh and Qaderiyeh mystic Sheikh Mohammad Saman Madani, he returned home and guided people untill the end of his life (Ansari, 1390: 3. Sheikh Sa'd od-Din was well learned in Islamic studies, Arabic language, rhetoric and sciences of his time. He was also familiar with the works of poets such as 'Attar, Rumi, Hafez, Ibn Arabi and other great names of mysticism. He was attached to Rumi and Hafez and has quoted them frequently in his works.Sheikh Sa'd od-Din wrote thirty six books and treatises including seven Divans and two Masnavis in Persian; He also wrote a book entitled The Mine of Unity and treatises  such as "Greetings Noble Tatar", "Habl ol-Matin" and "The Elite" in Arabic. He composed some poems in Arabic as well.At least from 1174 AH Sheikh Sa'd od-Din started to bring changes to the ancient Persian poetry; thus his deconstruction made poetical form much similar to contemporary Persian poetry. However, due to political and cultural distance between Iran and Afghanistan, we did not have a chance to get familiar with his innovations.His innovations consist of the following:1.      Refrained Masnavi (masnavi tarjee'band: He changed masnavi in a way that we can call it refrained masnavi, a sample of which is included in the paper. It consists of fifteen stanzas: The first stanza with eight lines, the second stanza fifty four lines, the twelfth stanza eleven lines and the other stanzas having equal lines. The line between

  5. Nitrogen-alloyed martensitic steels

    International Nuclear Information System (INIS)

    Berns, H.

    1988-01-01

    A report is presented on initial results with pressure-nitrided martensitic steels. In heat-resistant steels, thermal stability and toughness are raised by nitrogen. In cold work steel, there is a more favourable corrosion behaviour. (orig./MM) [de

  6. Microbial-Influenced Corrosion of Corten Steel Compared with Carbon Steel and Stainless Steel in Oily Wastewater by Pseudomonas aeruginosa

    Science.gov (United States)

    Mansouri, Hamidreza; Alavi, Seyed Abolhasan; Fotovat, Meysam

    2015-07-01

    The microbial corrosion behavior of three important steels (carbon steel, stainless steel, and Corten steel) was investigated in semi petroleum medium. This work was done in modified nutrient broth (2 g nutrient broth in 1 L oily wastewater) in the presence of Pseudomonas aeruginosa and mixed culture (as a biotic media) and an abiotic medium for 2 weeks. The behavior of corrosion was analyzed by spectrophotometric and electrochemical methods and at the end was confirmed by scanning electron microscopy. The results show that the degree of corrosion of Corten steel in mixed culture, unlike carbon steel and stainless steel, is less than P. aeruginosa inoculated medium because some bacteria affect Corten steel less than other steels. According to the experiments, carbon steel had less resistance than Corten steel and stainless steel. Furthermore, biofilm inhibits separated particles of those steels to spread to the medium; in other words, particles get trapped between biofilm and steel.

  7. Effect of Plasma Nitriding Process Conditions on Corrosion Resistance of 440B Martensitic Stainless Steel

    Directory of Open Access Journals (Sweden)

    Łępicka Magdalena

    2014-09-01

    Full Text Available Martensitic stainless steels are used in a large number of various industrial applications, e.g. molds for plastic injections and glass moldings, automotive components, cutting tools, surgical and dental instruments. The improvement of their tribological and corrosion properties is a problem of high interest especially in medical applications, where patient safety becomes a priority. The paper covers findings from plasma nitrided AISI 440B (PN-EN or DIN X90CrMoV18 stainless steel corrosion resistance studies. Conventionally heat treated and plasma nitrided in N2:H2 reaction gas mixture (50:50, 65:35 and 80:20, respectively in two different temperature ranges (380 or 450°C specimens groups were examined. Microscopic observations and electrochemical corrosion tests were performed using a variety of analytical techniques. As obtained findings show, plasma nitriding of AISI 440B stainless steel, regardless of the process temperature, results in reduction of corrosion current density. Nevertheless, applying thermo-chemical process which requires exceeding temperature of about 400°C is not recommended due to increased risk of steel sensitization to intergranular and stress corrosion. According to the results, material ion nitrided in 450°C underwent leaching corrosion processes, which led to significant disproportion in chemical composition of the corroded and corrosion-free areas. The authors suggest further research into corrosion process of plasma nitrided materials and its degradation products.

  8. COMPONENŢA AMINOACIZILOR DIN BIOMASA ALGEI CIANOFITE NOSTOC GELATINOSUM (SCHOUSB ELENK.

    Directory of Open Access Journals (Sweden)

    Sergiu DOBROJAN

    2016-02-01

    Full Text Available În articol este analizată componenţa aminoacizilor din biomasa algei cianofite Nostoc gelatinosum (Schousb Elenk. colectate de pe mediul nutritiv Drew. Din grupa aminoacizilor esenţiali în biomasa algei Nostoc gelatinosum (Schousb Elenk. se conţine în cantităţi majore leucina (2,142±0,06 mg/100 mg, treonina (1,188±0,02 mg/100 mg şi valina (1,085±0,03 mg/100 mg. Din aminoacizii neesenţiali predomină acidul aspartic (4,523±0,11 mg/100 mg şi acidul glutamic (2,774±0,07 mg/100 mg. Alga Nostoc gelatinosum (Schousb Elenk. are un conţinut bogat de aminoacizi şi poate servi ca sursă pentru vaste domenii de aplicare.THE AMINO ACIDS COMPOSITION OF THE BLUE-GREEN ALGANOSTOC GELATINOSUM (SCHOUSB ELENKThis article presents the amino acid content of the blue-green alga Nostoc gelatinosum (Schousb Elenk. collected from the Drew nutritive medium. From the essential amino group in Nostoc gelatinosum (Schousb Elenk. biomass, major amounts are contained leucine (2,142 ± 0,06 mg/100 mg, threonine (1,188 ± 0,02 mg/100 mg and valine (1,085 ± 0,03 mg/100 mg. From nonessential amino acids predominates aspartic acid (4,523 ± 0,11 mg/100 mg and glutamic acid (2,774 ± 0.07 mg/100 mg. The alga Nostoc gelatinosum (Schousb Elenk. has a high content of amino acids and can serve as a source for vast areas of application. 

  9. Las dinámicas interactivas en el ámbito universitario: el clima de aula

    Directory of Open Access Journals (Sweden)

    Zulay Pereira-Pérez

    2010-10-01

    Full Text Available Recibido 28 de julio de 2009 • Aceptado 02 de diciembre de 2009 • Corregido 20 de marzo de 2010     Las relaciones interpersonales en el ámbito humano cobran vital sentido desde el nacimiento y se van conformando en los procesos de interacción y socialización. El contexto educativo no está exento de procesos comunicativos e interactivos. Es en el aula de clase, donde, de manera más específica, se pueden identificar dichos procesos. El aula puede ser entendida como el espacio físico-humano, en el cual se desarrollan dinámicas a partir de las interacciones entre el profesorado y el grupo estudiantil, los contenidos, las estrategias de aprendizaje y el clima de aula que de ello se genera; aspectos todos, que como parte de los procesos de enseñanza y de aprendizaje están presentes en el ámbito de la clase. Es interesante analizar el clima de aula y las dinámicas interactivas que en ella se desarrollan, independientemente de la edad del estudiante –ya sea que se trate de infantes, adolescentes o adultos–. En este caso particular, se analiza el clima de aula en el ámbito universitario, entendiendo que las dinámicas interactivas que en el aula se desarrollen, determinan un ambiente propicio o no, para el proceso de enseñanza y de aprendizaje, que ha de ser considerado, si se opta por una educación integral y de calidad.

  10. Guns, Germs and Steel

    Indian Academy of Sciences (India)

    Home; Journals; Resonance – Journal of Science Education; Volume 6; Issue 1. Guns, Germs and Steel - A Short History of Everybody for the Last 13,000 years. Suri Venkatachalam. Book Review Volume 6 Issue 1 January 2001 pp 84-88. Fulltext. Click here to view fulltext PDF. Permanent link:

  11. Underwater welding of steel

    International Nuclear Information System (INIS)

    Ibarra, S.; Olson, D.L.

    1992-01-01

    A fundamental basis to understand the behavior of wet underwater welding of steel is introduced. Both the pyrometallurgical and physical metallurgy concepts are discussed. Modifications of welding consumables and practice are suggested. This chapter promotes further contributions of meatllurgical research to improve and promote wet underwater welding. (orig.)

  12. Japan steel mill perspective

    Energy Technology Data Exchange (ETDEWEB)

    Murase, K. [Kobe Steel Ltd., Tokyo (Japan)

    2004-07-01

    The international and Japan's steel industry, the coking coal market, and Japan's expectations from Canada's coal industry are discussed. Japan's steel mills are operating at full capacity. Crude steel production for the first half of 2004 was 55.8 million tons. The steel mills are profitable, but costs are high, and there are difficulties with procuring raw materials. Japan is trying to enhance the quality of coke, in order to achieve higher productivity in the production of pig iron. Economic growth is rising disproportionately in the BRICs (Brazil, Russia, India, and China), with a large increase in coking coal demand from China. On the supply side, there are several projects underway in Australia and Canada to increase production. These include new developments by Elk Valley Coal Corporation, Grande Cache Coal, Western Canadian Coal, and Northern Energy and Mining in Canada. The Elga Mine in the far eastern part of Russia is under development. But the market is expected to remain tight for some time. Japan envisions Canadian coal producers will provide a stable coal supply, expansion of production and infrastructure capabilities, and stabilization of price. 16 slides/overheads are included.

  13. On choice of tempered steels

    International Nuclear Information System (INIS)

    Govorov, A.A.; Pan'shin, I.F.; Rakhmanov, V.I.

    1978-01-01

    For the purpose of developing a graphical method for choosing structural steels, a change in the propagation work of a crack and in the critical temperature of brittleness of 40, 40Kh, 40KhN, and 40KhNM steels, was examined depending on the hardness after hardening and tempering. A diagram enabling to choose the grade of steel for making an article of known dimensions according to the preset values of its mechanical properties has been plotted. The developed selection scheme takes into account the hardenability of steels and the influence of the hardness after thermal treatment on the cold-shortness of steel

  14. Effects of different N sources on riverine DIN export and retention in subtropical high-standing island, Taiwan

    Science.gov (United States)

    Huang, J.-C.; Lee, T.-Y.; Lin, T.-C.; Hein, T.; Lee, L.-C.; Shih, Y.-T.; Kao, S.-J.; Shiah, F.-K.; Lin, N.-H.

    2015-10-01

    Increases in nitrogen (N) availability and mobility resulting from anthropogenic activities has substantially altered N cycle both locally and globally. Taiwan characterized by the subtropical montane landscape with abundant rainfall, downwind to the most rapidly industrializing east coast of China can be a demonstration site for extreme high N input and riverine DIN (dissolved inorganic N) export. We used 49 watersheds classified into low-, moderate-, and highly-disturbed categories based on population density to illustrate their differences in nitrogen inputs through atmospheric N deposition, synthetic fertilizers and human emission and DIN export ratios. Our results showed that the island-wide average riverine DIN export is ~ 3800 kg N km-2 yr-1, approximately 18-fold higher than the global average mostly due to the large input of synthetic fertilizers. The average riverine DIN export ratio is 0.30-0.51, which is much higher than the average of 0.20-0.25 of large rivers around the world indicating excessive N input relative to ecosystem demand or retention capacity. The low-disturbed watersheds, despite of high N input, only export 0.06-0.18 of the input so were well buffered to changes in input quantity suggesting high efficiency of nitrogen usage or high N retention capacity of the less disturbed watersheds. The high retention capacity probably is due to the effective uptake by secondary forests in the watersheds. The moderate-disturbed watersheds show a linear increase of output with increases in total N inputs and a mean DIN export ratio of 0.20 to 0.31. The main difference in land use between low and moderately disturbed watershed is the relative proportions of agricultural land and forests, not the built-up lands. Thus, their greater DIN export quantity could be attributed to N fertilizers used in the agricultural lands. The greater export ratios also imply that agricultural lands have lower proportional N retention capacity and that reforestation could be

  15. Una herramienta para la selección automatizada de aceros en el contexto // A tool for the automated selection of steels in the Mechanical Engineering´s context

    Directory of Open Access Journals (Sweden)

    L. Dumitrescu

    2010-01-01

    Full Text Available ResumenEl diseno de Ingenieria de un producto o componente constituye una actividad dificil, compleja ymultidisciplinaria, enfocada a la resolucion de problemas. En el presente trabajo se muestra eldesarrollo de una herramienta automatizada para la seleccion de los aceros mas utilizados en laconstruccion de maquinarias. La herramienta constituye una ayuda para la seleccion de losmateriales desde la etapa conceptual del proceso de diseno, donde se identifican las diferentescategorias de materiales a utilizar. La herramienta comprende las caracteristicas y propiedades masrelevantes de los aceros de Ingenieria disponibles en seis normas internacionales: Japonesa (JIS,Alemana (DIN, Vbn, DIN-Vbn, Rusa (GOST, Americana (AISI, SAE, AISI-SAE, ASTM, Inglesa (BS, EN,GB, Francesa (AFNOR y la Norma Cubana (NC vigente.Palabras claves: materiales, automatizada, aceros, ingenieria.____________________________________________________________AbstractThe product or component design constitutes a difficult, complex and multidisciplinary activity,focused to the resolution of problems. Presently work show the development of an automated toolfor the selection of the more used steels in the construction of machineries. The tool constitute ahelp for the selection of the materials from the conceptual stage of the design process, where thedifferent categories of materials are identified to use. The tool analyze the characteristics and morecommon properties of the available steels in six international standards: JIS (Japan, DIN, Vbn, DINVbn(Germany, GOST (Russia, AISI, SAE, AISI-SAE, ASTM (USA, BS, IN, GB (England, AFNOR(France and NC (Cuba.Key words: materials, automated, steels, engineering.

  16. Generación y dinámica de electrones runaway en plasmas tokamak

    OpenAIRE

    Fernández Gómez, Isabel

    2016-01-01

    La dinámica y generación de electrones runaway en plasmas tokamak constituye el tema central de esta tesis. En un tokamak, el fenómeno runaway es el resultado de la existencia de un campo eléctrico en dirección toroidal. Aquellos electrones cuya velocidad excede un cierto valor crítico se aceleran de forma continua, ya que la e ciencia de las colisiones para disipar la energía ganada en el campo disminuye con la velocidad (∼ ⁻¹) . Se tiene entonces lo que se conoce como un electrón runaway. ...

  17. Dinámicas relacionales en familias con un miembro consumidor de sustancias psicoactivas

    OpenAIRE

    Noreña Orozco, Sandra Patricia

    2017-01-01

    La investigación tuvo como propósito analizar las dinámicas relacionales que caracterizan el sistema familiar, cuando uno de sus miembros es consumidor de sustancias psicoactivas (SPA). La metodología se orientó desde una perspectiva cualitativa, a través de un estudio de caso con un enfoque hermenéutico. Para ello se contó con cuatro familias en las que uno de sus miembros fuera consumidor de SPA, contando con la participación de nueve personas, entre ellos las personas que consumen. Se esta...

  18. Os programas de geometria dinâmica no ensino básico

    OpenAIRE

    Fonseca, Cecília; Mateus, Joaquim

    2011-01-01

    Tendo em conta o contexto informático actual, estão ao dispor dos intervenientes no processo de ensino/aprendizagem um vasto leque de programas que permitem diversificar estratégias no ensino/aprendizagem da matemática. É neste enquadramento que se inserem os programas de geometria dinâmica, os quais constituem ferramentas interactivas que permitem a criação e manipulação de figuras geométricas, com base nas suas propriedades, favorecendo a compreensão dos conceitos e relações geométricas. ...

  19. La demanda de carnes y pescados en Túnez: un enfoque dinámico

    OpenAIRE

    Gil, José M.ª; Dhehibi, B.; Angulo, Ana Maria

    2001-01-01

    El objetivo de este trabajo consiste en analizar la demanda de carnes y pescado en Túnez utilizando sistemas econométricos multiecuacionales en base a datos de series temporales para el período 1973-1997. Se ha prestado especial atención a la especificación del modelo y al cumplimiento de las restricciones teóricas. Desde el primer punto de vista, se ha optado por un enfoque dinámico general que permite seleccionar la forma funcional que mejor se ajusta a los datos. Los resultados del análisi...

  20. Rashid al-Din. Shu’ab-i Panjganah. 2. The Mongols and Turks (3

    Directory of Open Access Journals (Sweden)

    Khamidova Ch.I.

    2017-12-01

    Full Text Available Research objectives and materials: The article presents a section of the translation from Persian of the 2nd chapter of the manuscript. This part contains a genealogical tree of Chaghadai, Ögedei Khan, Tölui, Möngke Khan (containing their descendants as known by Rashid al-Din. Research results and novelty: The results of translation and analyses of the text of the manuscript could serve in various purposes: study of Rashid al-Din’s heritage, Golden Horde history, genealogical history of the Chinggisid rulers and their descendants, etc. The translation of the manuscript has heretofore never been published in part or fully.

  1. Rashid al-Din. Shu’ab-i Panjganah. 2. The Mongols and Turks (4

    Directory of Open Access Journals (Sweden)

    Ch.I. Khamidova

    2018-03-01

    Full Text Available Research objectives and materials: The article presents a section of the translation from Persian of the 2nd chapter of the manuscript. This part contains a genealogical tree of Kubilai, Timur Khan, Arik Buka, Hulagu, Ahmad Khan, containing also those of their descendants who were known to Rashid al-Din. Research results and novelty: The results of translation and analyses of the manuscript text could serve in various purposes: the study of Rashid al-Din’s heritage, Golden Horde history, the genealogical history of the Chinggisid rulers and their descendants, etc. The translation of the manuscript has heretofore never been published in part or fully.

  2. Evolución Dinámica de Cúmulos Estelares Abiertos

    Science.gov (United States)

    de La Fuente Marcos, R.

    Las estrellas que observamos no se formaron aisladamente, sino que lo hicieron en grupos o cúmulos. Estos sistemas estelares recibenel nombre de cúmulos estelares abiertos o galácticos cuando están constituidos por estrellas de la Población I. Los cúmulos abiertos se localizan preferentemente en el plano galáctico, y en muchos de ellos está teniendo lugar aún una activa formación estelar. El propósito principal de esta tesis doctoral es el estudio de la evolución dinámica de estos sistemas estelares por medio de simulaciones numéricas y de la comparación de sus resultados con datos observacionales. Con este fin se analizan los efectos que, sobre la dinámica de los cúmulos, ejercen varios fenómenos de interés astrofísico tales como el campo gravitatorio galáctico, la pérdida de masa causada por la evolución estelar y la presencia de binarias primordiales. En este trabajo se presentan los resultados de más de un centenar de modelos de cúmulos, con poblaciones comprendidas en el intervalo [100, 10.000] estrellas, calculados con NBODY5, un programa estándar en el campo de la Dinámica Estelar Experimental. De los mismos se deduce que el mecanismo principal que rige la dinámica de los cúmulos abiertos es la evolución estelar de su distribución de masas, encontrándose un comportamiento diferencial fuertemente dependiente de la población inicial del cúmulo. Los mecanismos responsables de la desintegración de los cúmulos abiertos son analizados en detalle, proponiéndose un modelo analítico que ajusta razonablemente los resultados de las simulaciones. Además, y con el fin de explicar el elevado número de sistemas múltiples observados en cúmulos abiertos, se estudian los efectos que, sobre los mismos, ejerce la presencia de una cierta fracción de binarias primordiales. El papel de las binarias tambiín depende de la riqueza del cúmulo y sus efectos se interrelacionan con aquellos debidos a la evolución estelar. Por último, se

  3. Dinámicas territoriales de la industria automotriz argentina (1990-2012

    Directory of Open Access Journals (Sweden)

    Matías Donato Laborde

    2014-06-01

    Full Text Available El presente trabajo propone contribuir al análisis de las dinámicas territoriales vinculadas al funcionamiento de la industria automotriz argentina en los periodos de la convertibilidad y post convertibilidad. En este marco, se analizarán las principales características de la industria automotriz teniendo en cuenta las políticas públicas, las diferentes estrategias desplegadas por las empresas y los intercambios comerciales, asimismo se utilizan fuentes estadísticas del INDEC, la AFAC (Asociación de Fábricas Argentinas de Componentes y ADEFA (Asociación de Fábricas de Automotores.

  4. Dinâmica de populações em ambiente estocástico

    OpenAIRE

    Coelho Neto, Elias Dias

    2014-01-01

    Estudamos um modelo para dinâmica de duas populações interagentes, uma de presas e outra de predadores, sujeitas a um ruído aditivo, que pode ser interpretado como um termo de migração aleatória. Resolvemos numericamente as equações diferenciais estocásticas do modelo e comparamos os resultados com as soluções do modelo determinístico associado. Identificamos três comportamentos qualitativamente distintos, correspondentes a três tipos diferentes de pontos de equilíbrio do sistema determinísti...

  5. Comportamiento dinámico de depósitos aluviales en Colombia

    OpenAIRE

    Guzmán, Adolfo; Nuñez, Jsús; Parra, Fernando

    2006-01-01

    En este artículo se presentan las principales características de dos arenas de origen aluvial (Tumaco y Cali) potencialmente licuables, que históricamente han sido sometidas a cargas dinámicas generadas por sismos. Los dos depósitos se encuentran ubicados en áreas de amenaza sísmica alta, por lo que las aceleraciones máximas esperadas en roca fluctúan entre 0.2g y 0.3g. La caracterización de los depósitos granulares se realizó mediante pruebas de campo, complementados con ensayos de laborator...

  6. Dinâmica de redes de osciladores de Fitzhugh-Nagumo

    OpenAIRE

    Santos, Juliana Vicente dos

    2013-01-01

    O modelo de Fitzhugh-Nagumo é composto originalmente por um sistema de duas equações diferenciais não-lineares, que simulam o comportamento de condução do impulso nervoso através da membrana neural. Neste trabalho estudamos numericamente o comportamento dinâmico de redes de neurônios acoplados, modeladas pelas equações de Fitzhugh-Nagumo. Consideramos redes de dois, três e quatro neurônios acoplados unidirecionalmente e bidirecionalmente, para as quais foram construídos espaços de parâmetros ...

  7. Khwarezmian Army of Jalal ad-Din Mingburnu during the Mongol Invasion of Central Asia

    Directory of Open Access Journals (Sweden)

    D.M. Timokhin

    2013-11-01

    Full Text Available This article examines the features of formation and functioning of the Khwarezmian army of Jalal ad-Din Mingburnu during the period of the Mongol conquest of Central Asia. In addition to a detailed analysis of a military clash between the Mongol and Khwarezmian armies, the author determines the size and ethnic composition of the Jalal ad-Din’s army. The article considers the reflection by the Arab-Persian sources both of the military confrontation between Khwarezmians and Mongols and of the Khwarezmian army itself. The author defines the amount of information on this subject contained in the sources.

  8. Las Capacidades Dinámicas e Administración Estratégica

    Directory of Open Access Journals (Sweden)

    Vidigal Fernandes Martins

    2011-09-01

    Full Text Available Este ensayo teórico se centra en las teorías que explican cómo las organizaciones a obtener y mantener una ventaja competitiva. Tres Paradigmas se resumen, el paradigma y el paradigma de conflicto estratégico de Porter, y las conversaciones para poner fin al paradigma de recursos basado en recursos. "Capacidad dinámica" se derivan de la fuerte relación entre las nociones generalizadas de eficacia con respecto a los cambios y las fórmulas genéricas e la ventaja competitiva sustentable.

  9. A Mobilização de Capacidades Dinâmicas na Lojas Renner

    OpenAIRE

    Adalberto Escalona Gonçalves Garcia; Luiz Paulo Bignetti

    2014-01-01

    O artigo tem como objetivo analisar a trajetória de uma das empresas varejistas de maior destaque no mercado brasileiro, através de um estudo longitudinal que enfatiza a mobilização de seus recursos e capacidades ao longo de 90 anos de história. Explorando o conceito de capacidades dinâmicas, descrevem-se as ações estratégicas empreendidas em momentos de crescimento e de crise. Para tanto, foram realizadas entrevistas em profundidade com dez tomadores de decisão que vivenciaram diferentes mom...

  10. [Quality assurance in student training. Prerequisites for DIN EN ISO 9001:2000 in teaching].

    Science.gov (United States)

    Ochsner, W; Kaiser, C; Schirmer, U

    2007-07-01

    Standards of quality assurance according to DIN EN ISO 9001:2000 have been implemented in many university hospital departments, but often teaching activities are not included. This work presents a method that allows, after having defined the various teaching activities as sub-processes of one single core process, to include the manifold teaching activities of university hospital departments into the certification process. The stepwise description of the prerequisites for including teaching activities into ISO 9001 certification is illustrated by a concrete implementation example.

  11. The DinJ/RelE Toxin-Antitoxin System Suppresses Bacterial Proliferation and Virulence of Xylella fastidiosa in Grapevine.

    Science.gov (United States)

    Burbank, Lindsey P; Stenger, Drake C

    2017-04-01

    Xylella fastidiosa, the causal agent of Pierce's disease of grapes, is a slow-growing, xylem-limited, bacterial pathogen. Disease progression is characterized by systemic spread of the bacterium through xylem vessel networks, causing leaf-scorching symptoms, senescence, and vine decline. It appears to be advantageous to this pathogen to avoid excessive blockage of xylem vessels, because living bacterial cells are generally found in plant tissue with low bacterial cell density and minimal scorching symptoms. The DinJ/RelE toxin-antitoxin system is characterized here for a role in controlling bacterial proliferation and population size during plant colonization. The DinJ/RelE locus is transcribed from two separate promoters, allowing for coexpression of antitoxin DinJ with endoribonuclease toxin RelE, in addition to independent expression of RelE. The ratio of antitoxin/toxin expressed is dependent on bacterial growth conditions, with lower amounts of antitoxin present under conditions designed to mimic grapevine xylem sap. A knockout mutant of DinJ/RelE exhibits a hypervirulent phenotype, with higher bacterial populations and increased symptom development and plant decline. It is likely that DinJ/RelE acts to prevent excessive population growth, contributing to the ability of the pathogen to spread systemically without completely blocking the xylem vessels and increasing probability of acquisition by the insect vector.

  12. [Ernst Rüdin--a Swiss psychiatrist as the leader of Nazi psychiatry--the final solution as a goal].

    Science.gov (United States)

    Peters, U H

    1996-09-01

    The study of work and life of the Swiss-German psychiatrist Ernst Rüdin, honoured up to our time as "father of psychiatric genealogy", lead to different views. Rüdin early in his life became a racial fanatic, and as a propagandist for the purity of the "Germanic people" he constantly demanded preventive coercive measures against the reproduction of the mentally ill and other, in the racist's view, undesirable persons. With this objective in mind he started his psychiatric research. The results of Rüdin's monograph about the genetics of dementia precox do not withstand scientific criticism but confirmed his preexisting opinions. They served however as scientific reasoning for the forced sterilisation by the Nazis, for which Rüdin's comments were obligatory. The next step, to the holocaust of the mentally ill and the undesirable, was not only tacitly agreed with by Rüdin. Max Weber, Karl Jaspers and others realised at an early time the dangers arising from racial hygienics and voiced their warnings in a plain language. The surviving victims are still waiting for compensation.

  13. Challenges in Special Steel Making

    Science.gov (United States)

    Balachandran, G.

    2018-02-01

    Special bar quality [SBQ] is a long steel product where an assured quality is delivered by the steel mill to its customer. The bars have enhanced tolerance to higher stress application and it is demanded for specialised component making. The SBQ bars are sought for component making processing units such as closed die hot forging, hot extrusion, cold forging, machining, heat treatment, welding operations. The final component quality of the secondary processing units depends on the quality maintained at the steel maker end along with quality maintained at the fabricator end. Thus, quality control is ensured at every unit process stages. The various market segments catered to by SBQ steel segment is ever growing and is reviewed. Steel mills need adequate infrastructure and technological capability to make these higher quality steels. Some of the critical stages of processing SBQ and the critical quality maintenance parameters at the steel mill in the manufacture has been brought out.

  14. Din portfolio

    DEFF Research Database (Denmark)

    Petersen, Kim Bach; Jespersen, Troels Bilskov; Pugh, Heidi Elsebeth

    2017-01-01

    Guiden giver studerende på pædagoguddannelsen inspiration til, hvordan de kan bruge arbejdsportfolio som en arbejdsform igennem studiet, og hvordan de udforme deres præsentationsportfolio i forbindelse med uddannelsens prøver....

  15. Heat Treatment and Properties of Iron and Steel

    National Research Council Canada - National Science Library

    Digges, Thomas

    1966-01-01

    .... Chemical compositions, heat treatments, and some properties and uses are presented for structural steels, tool steels, stainless and heat-resisting steels, precipitation-hardenable stainless steels...

  16. Duygusal Zeka Din Öğretimi; Din Kültürü ve Ahlak Bilgisi Dersi ve Duygusal Zeka Gelişim İlişkisi

    Directory of Open Access Journals (Sweden)

    Remziye Ege

    2015-11-01

    Full Text Available Duygusal zeka, bireyin, kendi duygularını anlaması, başkalarıın duygularına empati  beslemesi, duygu yönetimi, motivasyon ve duygularını yaşamı zenginleştirecek biçimde düzenleyebilme yetisi olarak tanımlanmaktadır. Din öğretimi yoluyla duygusal zeka becerilerinin ve yerisinin elde edileceği ve geliştirileceği düşünülmektedir. Bu makalede İlköğretim Din Kültürü ve Ahlak Bilgisi Dersinin muhtevasından hareketle duygusal zeka gelişimi ile din öğretimi arasındaki paralel ilişkiye dikkat çekmek hedeflenmiştir. Söz konusu ilişki, din öğretiminin inanç, ibadet, dua, ahlak öğretim alanlarındaki konulardan örnekler üzerinde belirtilmiştir. Duygusal zeka, bireyin, kendi duygularını anlaması, başkalannın duygulanna empati beslemesi, duygu yönetimi, motivasyon ve duygularını yaşamı zenginleştirecek biçimde düzenleyebilme yetisi olarak tanımlanmaktadır. Din öğretimi yoluyla duygusal zeka becerilerinin ve yerisinin elde edileceği ve geliştirileceği düşünülmektedir. Bu makalede İlköğretim Din Kültürü ve Ahlak Bilgisi Dersinin muhtevasından hareketle duygusal zeka gelişimi ile din öğretimi arasındaki paralel ilişkiye dikkat çekmek hedeflenmiştir. Söz konusu ilişki, din öğretiminin inanç, ibadet, dua, ahlak öğretim alanlarındaki konulardan örnekler üzerinde belirtilmiştir

  17. Nitrided steel 38CrN3MAFA for supporting elements in nuclear power plants; Vysokoazotistaya stal` tipa 38HN3MAFA dlya krepezhnikh detajlej reaktorov AEhS

    Energy Technology Data Exchange (ETDEWEB)

    Rasheva, I; Argirov, Kh; Stojchev, T [Bylgarska Akademiya na Naukite, Sofia (Bulgaria). Inst. po Metaloznanie i Tekhnologiya na Metalite

    1996-12-31

    Nitride doping of steel at different concentrations is achieved by counter-pressure casting in nitrogen ambience. A new type of steel is developed containing 0.05-0.2% N{sub 2}. It is compared to a standard 34NiCrMoV145 steel (DIN). The mechanical properties are improved significantly after a two-stage thermal treatment and are as follows: fluidity limit R{sub 0}.2>=1045 MPa, relative elongation A>=15%, relative shortening Z>=62%, impact viscosity KCU >= 1 MJ/m{sup 2}. The quench hardening consists of heating to 800-850{sup o} C in oil and cooling to 600{sup o} C in air. The steel is suitable for rotors, turbines, compressor shafts and reactor supporting elements in nuclear power plants. 3 refs., 6 figs., 6 tabs.

  18. Dinámica migratoria... ¿hibridación cultural u homologación global?

    Directory of Open Access Journals (Sweden)

    Claudia Carolina Zamorano Villarreal

    2014-01-01

    Full Text Available Ante la consolidación del modelo de subcontratación en México asistimos a una nueva cultura laboral ¿Qué cambios ha impulsado este modelo en las prácticas de la pobla - ción y su cultura? Analizando la relación entre el modo de producción flexible de la maquila y la dinámica de migración propia a las ciudades de la frontera norte de Mé - xico, se muestra que la maquiladora respetó y aprovechó está dinámica para reducir o aumentar el número de trabajadores, según lo requiriera la producción flexible. Pero, desde mediados de los años noventa, empezó a transformar estás dinámicas y con ellas, la cultura de sus trabajadores.

  19. Seguimiento a la dinámica competitiva de dos grupos económicos colombianos

    Directory of Open Access Journals (Sweden)

    Carlos Rodríguez Romero

    2007-06-01

    Full Text Available Diferentes tipos de trabajos describen la importancia de la dinámica de multimercados para explicar cómo compiten las empresas que coinciden en diferentes sectores de su actividad. En este artículo se busca presentar inicialmente el cuerpo teórico que soporta la dinámica competitiva, para luego ejemplificar su aplicación en un estudio analítico que identifique las acciones competitivas, no sólo de los dos conglomerados colombianos más importantes, sino también de los individuos que se encuentran al mando de estas organizaciones. La investigación utiliza el análisis estructurado de contenido a través fuentes secundarias para identificar las acciones competitivas de las organizaciones estudiadas en el periodo de 1986-2002. De tal manera, se expondrá la lógica que utilizaron durante los últimos años esos dos grupos económicos en diversos mercados y cómo han aplicado sus estrategias competitivas, para rivalizar en sectores tan heterogéneos como la radio, la televisión, las gaseosas, las cervezas e incluso en el patrocinio de estrellas del deporte y la farándula nacional.

  20. Programação dinâmica aplicada a finanças

    Directory of Open Access Journals (Sweden)

    Tara Keshar Nanda Baídya

    1997-12-01

    Full Text Available Este artigo mostra a aplicação da programação dinâmica estocástica e o seu uso em Finanças. Um dos objetivos mais usuais da teoria financeira é determinar a trajetória ou caminho ótimo para determinada variável. Brennan e Schwartz (1985 analisaram economicamente o investimento na exploração de um recurso mineral. Determinaram o valor do projeto e o instante ótimo de realizar o investimento. Para tal, usaram os conceitos da teoria das opções e técnicas de avaliação por arbitragem. Este artigo obtém o mesmo modelo usando a programação dinâmica e os conceitos de finanças em tempo contínuoThis paper shows the dynamic programming approach related to Finance Theory. We exhibit how to construct the optimal path, one of the most important aims in the Finance. Brennan and Shwartz (1985 derived their model to evaluate a project of mining using option pricing theory and arbitrage approach. This is an use of option theory to evaluate a real project. Here we obtain the same model as an example, using stochastic dynamic programming

  1. Metafísica y dinámica caótica

    Directory of Open Access Journals (Sweden)

    Vicente Aboites

    2009-01-01

    Full Text Available From an internalist viewpoint for mental states, it is proposed that any dynamical system with coexisting chaotic attractors has an emergent property. This provides a non reductive explanation of mental states and their high sensitivity to noise and initial conditions. If metaphysical terms result from the mental states and these are emergent properties of dynamical systems with coexisting attractors, such as the brain, it is suggested that this may provide a physical explanation of metaphysical concepts. A partir de un enfoque internalista para los estados mentales, se propone que los términos metafísicos son el resultado de estados mentales que, a su vez, son propiedades emergentes de sistemas dinámicos caóticos con atractores coexistentes en el cerebro. Se sugiere que esto proporciona una explicación física para los conceptos metafísicos. Esto se hace a partir de la propuesta de que todos los sistemas dinámicos con atractores coexistentes caóticos, como el cerebro, presentan propiedades emergentes. Obtenemos así una explicación no reductiva de los estados mentales y su alta sensibilidad al ruido y a las condiciones iniciales.

  2. Sosyal Kurumlarda Din Hizmetleri Ve Sosyal Zekâ İlişkisi

    Directory of Open Access Journals (Sweden)

    Remziye Ege

    2013-06-01

    Full Text Available Bu makale sosyal zekâ çerçevesinde din hizmetleri uygulamalarının yeniden düşünülmesi konusunda bir farkındalık oluşturmayı hedeflemektedir. İlahiyat alanındaki mesleki uygulamalara odaklanarak bu uygulamalar içinde sosyal zekânın yeri tartışılmıştır. Bu bağlamda, makalede önce sosyal zekânın ne olduğu sorusu İyi Yürekli Samaryalı Meseli (Luka 10:25-37 ile ilgili bir araştırma özelinde ele alınmakta, daha sonra ise sosyal zekânın din hizmetleri uygulamaları alanındaki etkisi değerlendirilmektedir. Makalenin son bölümünde sosyal zekâyı geliştirme yolunda bazı öneriler sunulmuştur

  3. Obtención de Modelos Borrosos Interpretables de Procesos Dinámicos

    Directory of Open Access Journals (Sweden)

    Juan Contreras Montes

    2008-07-01

    Full Text Available Resumen: En este artículo se presenta una novedosa metodología para la construcción de modelos borrosos lingüísticamente interpretables, a partir de datos de entrada y salida, de procesos dinámicos. Se describe una sencilla técnica de agrupamiento para construcción de las reglas borrosas, así como el empleo de mínimos cuadrados para ajuste de consecuentes. Para garantizar la interpretabilidad del modelo borroso la partición de los antecedentes emplea conjuntos triangulares con interpolación de 0.5. El aspecto más promisorio en nuestra propuesta consiste en alcanzar una buena precisión sin sacrificar la interpretabilidad del sistema borroso ni recurrir a otras técnicas de inteligencia artificial. Se presentan aplicaciones a problemas o conjuntos de datos ampliamente conocidos (benchmark classic como la cámara de gas de Box-Jenkins, la serie caótica de Mackey Glass y la dinámica de cabeceo de un helicóptero a escala, y se comparan los resultados con aquellos obtenidos por otros autores que emplean técnicas diferentes. Palabras clave: identificación, agrupamiento, mínimos cuadrados, modelo borroso, interpretabilidad

  4. Prospectiva de la cadena Productiva de mango bajo el enfoque dinámico

    Directory of Open Access Journals (Sweden)

    Juan Pablo Tribín-Rivera

    2014-01-01

    Full Text Available El propósito del presente documento de investigación, es relacionar los resultados del análisis prospectivo de la cadena productiva de mango en la Provincia del Tequendama – Cundinamarca por medio de dinámica de sistemas, con el fin de compararla desde distintos escenarios; mercado interno frente al mercado externo, y así poder determinar el escenario prospectivo más conveniente para los productores. De igual forma se proponen políticas que mejoren las condiciones de los productores de la región y se relaciona el modelo de simulación por dinámica de sistemas, que puede ser utilizado en diferentes cadenas productivas. La construcción del modelo de simulación se desarrolló con base en las experiencias adquiridas por medio de visitas de campo, recolección de información primaria y secundaria, y la colaboración de expertos que participan, directa o indirectamente, en dicha cadena productiva, enmarcadas bajo el proyecto de investigación titulado “Mercado prospectivo del mango: Comparativo entre el mercado interno y el mercado externo para la Provincia del Tequendama – Cundinamarca”

  5. MECANISMUL DE PROTEOLIZĂ A FICOCIANINEI, PROTEINEI BIOACTIVE DIN SPIRULINĂ SUB ACŢIUNEA PAPAINEI

    Directory of Open Access Journals (Sweden)

    Angela RUDAKOVA

    2016-02-01

    Full Text Available Elaborarea unor procedee de obţinere a peptidelor bioactive din ficocianină prin intermediul hidrolizei proteolitice prezintă un interes sporit pentru cercetători în contextul utilizării acestora în calitate de remedii anticancer şi pentru alte proprietăţi terapeutice. Peptidele derivate din ficocianină ar putea manifesta proprietăţi terapeutice mult mai pronunţate comparativ cu ficocianina. În prezenta lucrare sunt studiate dinamica proteolizei ficocianinei cu papaina şi mecanismul de hidroliză a acestei proteine.Mechanism of proteolysis of C-phycocyanin, bioactive protein from Spirulina, under the action of papainThe elaboration of the procedures of obtaining of bioactive peptides derived from phycocyanin, as a result of it proteolytic hydrolysis presents great interest for researchers in the terms of theirs use as anti-cancer drugs and for other therapeutic properties. It can be assumed that peptides derived from phycocyanin could manifest more pronounced therapeutic effects compared to phycocyanin. Dynamics of phycocyanin proteolisis by papain, as well as mechanism of phycocyanin hydrolysis were studied in the present work. 

  6. Novo desenvolvimentismo e dinâmica urbano-regional no Brasil (2004-2012

    Directory of Open Access Journals (Sweden)

    Hipólita Siqueira

    2015-01-01

    Full Text Available As mudanças no contexto nacional e internacional impuseram novas questões ao debate sobre a dinâmica urbano-regional brasileira. Dentre elas, o aprofundamento da inserção internacional do País, tendo como base seu potencial de recursos naturais e sua articulação com o "efeito-China" na reconfiguração das relações internacionais, e o processo de desindustrialização, decorrente da especialização produtiva regressiva e da apreciação da taxa de câmbio. O objetivo deste artigo é examinar as lin-has gerais da dinâmica urbano-regional no âmbito das transformações na economia e sociedade brasileiras desde os anos 1980, especialmente no período pós-2004, em que ocorre uma retomada do crescimento econômico e dos gastos estatais. Entende-se que tal análise enfrenta desafios teórico-metodológicos importantes, sendo necessário o resgate de referenciais analíticos, como o da divisão espacial do trabalho para o entendimento das desigualdades regionais, e a (reformulação da questão regional brasileira.

  7. Surveying the Vienna Meridian from Brno to Varaždin

    Directory of Open Access Journals (Sweden)

    Miljenko Solarić

    2016-12-01

    Full Text Available The introduction provides a brief overview of using trigonometric chains for determining meridian arc lengths in Europe, as well as their extension to trigonometric networks in order to produce contemporary accurate maps in France. After Ruđer Bošković had visited Croatian-Hungarian Queen and Roman-German Empress Maria Theresa, she ordered Jesuit Joseph Liesganig to survey the meridian from Brno (Soběšice, over Vienna and Graz to Varaždin by establishing and surveying a trigonometric chain. That distance amounts to 320 km, i.e. the difference between latitude of the starting and finishing points of the chain equaled 2° 56' 45.85''. Two baselines were measured directly between Wiener Neustadt and Neunkirchen of 6410.903 Vienna fathom (12 158.175 m and between Seyring and Glizendorf in the Moravian field (Moravské pole, Marchfeld of 6387.862 Vienna fathom (12 114.478 m. Liesganig published previous Vienna Meridian survey results in Philosophical Transactions in London in 1768 and the final results in Latin in Dimensio Graduum Meridiani Viennensis et Hungarici in 1770. His results were quickly criticized and subsequently subjected to validation. Trigonometric point Varaždin is the first and oldest trigonometric point in Croatia.

  8. Primeros pasos en la posturografía dinámica computarizada

    Directory of Open Access Journals (Sweden)

    Cristina CORDERO-CIVANTOS

    2018-01-01

    Full Text Available Introducción y objetivo: La posturografía dinámica computarizada (CDP es una técnica que nos va a permitir cuantificar de forma objetiva, como las diferentes patologías afectan la estabilidad postural de los pacientes y su evolución. Metodología: revisión narrativa. Resultados: En este trabajo vamos a repasar como se realizan y analizan las diferentes pruebas de la CDP; y su utilidad diagnóstica y terapéutica en la práctica otorrinolaringológica. Discusión y conclusiones: La posturografía dinámica computarizada es una prueba diagnóstico-terapéutica que permite cuantificar de forma objetiva y reproducible la estabilidad del paciente. Y aporta información relevante para planificar el tratamiento rehabilitador, así como para monitorizar su evolución.

  9. Steel for nuclear applications

    International Nuclear Information System (INIS)

    Zorev, N.N.; Astafiev, A.A.; Loboda, A.S.

    1978-01-01

    A steel contains, in percent by weight, the following constituents: carbon from 0.13 to 0.18, silicon from 0.17 to 0.37, manganese from 0.30 to 0.60, chromium from 1.7 to 2.4, nickel from 1.0 to 1.5, molybdenum from 0.5 to 0.7, vanadium from 0.05 to 0.12, aluminium from 0.01 to 0.035, nitrogen from 0.05 to 0.012, copper from 0.11 to 0.20, arsenic from 0.0035 to 0.0055, iron and impurities, the balance. This steel is preferable for use in the manufacture of nuclear reactors. 1 table

  10. Advances in stainless steels

    International Nuclear Information System (INIS)

    Baldev Raj; Jayakumar, T.; Saibaba, Saroja; Sivaprasad, P.V.; Shankar, P.

    2010-01-01

    This book covers a broad spectrum of topics spanning the entire life cycle of stainless steel-from alloy design and characterization to engineering design, fabrication, mechanical properties, corrosion, quality assurance of components, in-service performance assessment, life prediction and finally failure analysis of materials and components. The contents provide useful feedback for further developments aimed at effective utilization of this class of materials. The book comprises articles that bring out contemporary developments in stainless steels and is thematically classified into the following sections. 1. Component design, modelling and structural integrity, 2. Manufacturing technology, 3. Property evaluation, 4. Alloy development and applications, 5. NDE methods, 6. Corrosion and surface modification. The book commences with articles on component design and structural integrity, thus opening up the areas of challenge for researchers and academia. The articles in the book relevant to INIS are indexed separately

  11. Steel containment buckling

    International Nuclear Information System (INIS)

    Bennett, J.G.; Fly, G.W.; Baker, W.E.

    1984-01-01

    The Steel Containment Buckling program is in its fourth phase of work directed at the evaluation of the effects of the structural failure mode of steel containments when the membrane stresses are compressive. The structural failure mode for this state of stress is instability or buckling. The program to date has investigated: (1) the effect on overall buckling capacity of the ASME area replacement method for reinforcing around circular penetrations; (2) a set of benchmark experiments on ring-stiffened shells having reinforced and framed penetrations; (3) large and small scale experiments on knuckle region buckling from internal pressure and post-buckling behavior to failure for vessel heads having torispherical geometries; and (4) buckling under time-dependent loadings (dynamic buckling). The first two investigations are complete, the knuckle buckling experimental efforts are complete with data analysis and reporting in progress, and the dynamic buckling experimental and analytical work is in progress

  12. Steel containment buckling

    International Nuclear Information System (INIS)

    Butler, T.A.; Baker, W.E.

    1986-01-01

    Two aspects of buckling of a free-standing nuclear steel containment building were investigated in a combined experimental and analytical program. In the first part of the study, the response of a scale model of a containment building to dynamic base excitation is investigated. A simple harmonic signal was used for preliminary studies followed by experiments with scaled earthquake signals as the excitation source. The experiments and accompanying analyses indicate that the scale model response to earthquake-type excitations is very complex and that current analytical methods may require a dynamic capacity reduction factor to be incorporated. The second part of the study quantified the effects of framing at large penetrations on the static buckling capacity of scale model containments. Results show little effect from the framing for the scale models constructed from the polycarbonate, Lexan. However, additional studies with a model constructed of the prototypic steel material are suggested

  13. Herramientas del álgebra lineal para el control de sistemas lineales dinámicos conmutados

    OpenAIRE

    Rivera Martínez, Laura

    2016-01-01

    En el presente proyecto se aborda una introducción a la teoría sobre Sistemas Lineales Dinámicos Conmutados (SLDC), con el propósito de estudiar su comportamiento, que posteriormente (en el Capítulo 5) será aplicada a un problema del ámbito de la ingeniería eléctrica : un circuito RLC. A tal fin, se recurre a la teoría generalizada sobre Sistemas Lineales Dinámicos (SLD), (fundamentada a partir de las referencias [1] y [6], esencialmente) en la cual se desarrolla una explicación detallada ...

  14. Equações discretas no ensino médio: modelos de dinâmicas populacionais

    OpenAIRE

    Maligeri, Glaucía Cristina Alecci Meneghim [UNESP

    2013-01-01

    As equações discretas fornecem as ferramentas matemáticas básicas para a correta modelagem da dinâmica populacional ao se tomar como hipótese tempos discretos. Neste trabalho, apresentamos a teoria das equações discretas e algumas aplicações no capítulo 01, dando ênfase aos modelos de dinâmica populacional conhecidos como modelo de Malthus e de Verhulst junto com exemplos que evidenciam tais modelos na modelagem de populações reais. No capítulo 02 apresentamos duas propostas didáticas; a prim...

  15. Reactor pressure vessel steels

    International Nuclear Information System (INIS)

    Van De Velde, J.; Fabry, A.; Van Walle, E.; Chaouuadi, R.

    1998-01-01

    Research and development activities related to reactor pressure vessel steels during 1997 are reported. The objectives of activities of the Belgian Nuclear Research Centre SCK/CEN in this domain are: (1) to develop enhanced surveillance concepts by applying micromechanics and fracture-toughness tests to small specimens, and by performing damage modelling and microstructure characterization; (2) to demonstrate a methodology on a broad database; (3) to achieve regulatory acceptance and industrial use

  16. Reactor Pressure Vessel Steels

    Energy Technology Data Exchange (ETDEWEB)

    Van de Velde, J.; Fabry, A.; Van Walle, E.; Chaoudi, R

    1998-07-01

    SCK-CEN's R and D programme on Reactor Pressure Vessel (RPV) Steels in performed in support of the RVP integrity assessment. Its main objectives are: (1) to develop enhanced surveillance concepts by applying micromechanics and fracture-toughness tests to small specimens, and by performing damage modelling and microstructure characterization; (2) to demonstrate the applied methodology on a broad database; (3) to achieve regulatory acceptance and industrial use. Progress and achievements in 1999 are reported.

  17. Steele Richardson Olszewski syndrome

    Directory of Open Access Journals (Sweden)

    Vijayashree S Gokhale

    2013-01-01

    Full Text Available Parkinson′s disease and its plus syndromes are an important cause of morbidity in the geriatric age group. Its plus syndromes show a myriad of clinical features characterized by progressive symptoms. Here we present a 65-year-old woman with progressive "Parkinsonian-like features," i.e., mask-like face, slowness of all movements and tendency to fall, and difficulty in eye movements, leading to the diagnosis of Steele Richardson Olszewski Syndrome or progressive supranuclear palsy.

  18. Steels and welding nuclear

    International Nuclear Information System (INIS)

    Sessa, M.; Milella, P.P.

    1987-01-01

    This ENEA Data-Base regards mechanical properties, chemical composition and heat treatments of nuclear pressure vessel materials: type A533-B, A302-B, A508 steel plates and forgings, submerged arc welds and HAZ before and after nuclear irradiation. Irradiation experiments were generally performed in high flux material test reactors. Data were collected from international available literature about water nuclear reactors pressure vessel materials embrittlement

  19. Welding procedure specification for arc welding of St 52-3N steel plates with covered electrodes

    International Nuclear Information System (INIS)

    Cvetkovski, S.; Slavkov, D.; Magdeski, J.

    2003-01-01

    In this paper the results of approval welding technology for arc welding of plates made of St 52-3N steel are presented. Metal arc welding with covered electrode is used welding process. Test specimens are butt welded in different welding positions P A , P F , P C and P D . Before start welding preliminary welding procedure was prepared. After welding of test specimens non destructive and destructive testing was performed. Obtained results were compared with standard DIN 17100 which concerns to chemical composition and mechanical properties of base material. It was confirmed that in all cases mechanical properties of welded joint are higher than those of base material, so preliminary welding procedure (pWTS) can be accepted as welding procedure specification WPS for metal arc welding of St52-3N steel. (Original)

  20. Filme din ţările Puterilor Centrale pe ecranele din Bucureștii ocupaţi (1916–1918

    Directory of Open Access Journals (Sweden)

    Adrian-Silvan Ionescu

    2016-10-01

    Full Text Available Once Romania joined the war, alongside with the Allies, by the end of the summer of 1916, the cinema theatres were closed, like all other places of entertainment. This was a significant blow to townsfolk used to spend their free time in theatre halls. However, it did not last long, because on September 11, they are reopened on special schedules, only from 3 to 6 p.m. In the first days of October, patriotic and propaganda films like „Martiriul Românilor din Ardeal” (The Martyrdom of Romanians in Transylvania, were being run. In the first decade of the next month, there was announced the work on the „historic and patriotic film the Great War for the Liberation of the Romanian Nation”, which followed to contain scenes of the recent fighting on the front. The film was expected to be released on November 14 at Zaharia cinema theatre. However, the situation on the front was not favourable for the Romanian armies and soon the enemy occupied the south of the country. The German occupational civil and military administration intended to make of Romania an example of good management and judicious care for the welfare and contentment of mind of the residents – even if all this was mere propaganda.

  1. Filme din ţările Puterilor Centrale pe ecranele din Bucureştii ocupaţi (1916–1918. Partea a II-a

    Directory of Open Access Journals (Sweden)

    Ionescu

    2017-10-01

    Full Text Available Once Romania joined the war, alongside with the Allies, by the end of the summer of 1916, the cinema theatres were closed, like all other places of entertainment. This was a significant blow to townsfolk used to spend their free time in theatre halls. However, it did not last long, because on September 11, they are reopened on special schedules, only from 3 to 6 p.m. In the first days of October, patriotic and propaganda films like ”Martiriul Românilor din Ardeal” (The Martyrdom of Romanians in Transylvania, were being run. In the first decade of the next month, it was announced the work on the ”historic and patriotic film the Great War for the Liberation of the Romanian Nation”, which followed to contain scenes of the recent fighting on the front. The film was expected to be released on November 14 at ”Zaharia” cinema theatre. However, the situation on the front was not favourable for the Romanian armies and soon the enemy occupied the south of the country. The German occupational civil and military administration intended to make of Romania an example of good management and judicious care for the welfare and contentment of mind of the residents – even if all this was mere propaganda.

  2. Career Dilemmas among Diné (Navajo College Graduates: An Exploration of the Dinétah (Navajo Nation Brain Drain

    Directory of Open Access Journals (Sweden)

    Avery Denny

    2013-11-01

    Full Text Available Like many Indigenous nations, the Navajo Nation has worked to develop its human and economic potential. It has provided scholarships and other supports to enable its members to pursue post-secondary education. However, relatively few of these college-educated members return to the reservation to contribute directly to its development. This phenomenon has been termed a brain drain. This study explored the experiences of 28 college-educated Navajos who, while raised on the reservation, were living off the reservation after completing their post-secondary education. Participants indicated a number of factors that went into their decision to live off the reservation. These included:1. Ké’: Relationships/Connections to Family, Culture, Homeland, People;2. Iiná: Lifestyle/Lifeway, Desirable Setting, Learned Work Ethic, Social Atmosphere, Togetherness (Diné vs. Individualism (Mainstream;Bee ach’į’ na’hwii’ná: Resources and Roadblocks to Making a Life, Infrastructure, Services, The “System”;3. Bee ajit’9: Opportunity, Prosperity and Personal Improvement, Education, Extracurricular, Job Availability, Work Experience.

  3. Contaminated Mexican steel incident

    International Nuclear Information System (INIS)

    1985-01-01

    This report documents the circumstances contributing to the inadvertent melting of cobalt 60 (Co-60) contaminated scrap metal in two Mexican steel foundries and the subsequent distribution of contaminated steel products into the United States. The report addresses mainly those actions taken by US Federal and state agencies to protect the US population from radiation risks associated with the incident. Mexico had much more serious radiation exposure and contamination problems to manage. The United States Government maintained a standing offer to provide technical and medical assistance to the Mexican Government. The report covers the tracing of the source to its origin, response actions to recover radioactive steel in the United States, and return of the contaminated materials to Mexico. The incident resulted in significant radiation exposures within Mexico, but no known significant exposure within the United States. Response to the incident required the combined efforts of the Nuclear Regulatory Commission (NRC), Department of Energy, Department of Transportation, Department of State, and US Customs Service (Department of Treasury) personnel at the Federal level and representatives of all 50 State Radiation Control Programs and, in some instances, local and county government personnel. The response also required a diplomatic interface with the Mexican Government and cooperation of numerous commercial establishments and members of the general public. The report describes the factual information associated with the event and may serve as information for subsequent recommendations and actions by the NRC. 8 figures

  4. The DNA damage-inducible dinD gene of Escherichia coli is equivalent to orfY upstream of pyrE

    DEFF Research Database (Denmark)

    Lundegaard, Claus; Jensen, Kaj Frank

    1994-01-01

    The DNA damage-inducible gene dinD, originally identified by Kenyon and Walker (C. J. Kenyon and G. C. Walker, Proc. Natl. Acad. Sci. USA 77:2819-2823, 1980) by selection of the dinD::MudI (Ap lac) fusion, is shown here to be equivalent to the open reading frame orfY near pyrE. The evidence...

  5. Fracture Mechanisms in Steel Castings

    Directory of Open Access Journals (Sweden)

    Stradomski Z.

    2013-09-01

    Full Text Available The investigations were inspired with the problem of cracking of steel castings during the production process. A single mechanism of decohesion - the intergranular one - occurs in the case of hot cracking, while a variety of structural factors is decisive for hot cracking initiation, depending on chemical composition of the cast steel. The low-carbon and low-alloyed steel castings crack due to the presence of the type II sulphides, the cause of cracking of the high-carbon tool cast steels is the net of secondary cementite and/or ledeburite precipitated along the boundaries of solidified grains. Also the brittle phosphor and carbide eutectics precipitated in the final stage solidification are responsible for cracking of castings made of Hadfield steel. The examination of mechanical properties at 1050°C revealed low or very low strength of high-carbon cast steels.

  6. A new implementation of full resolution SBAS-DInSAR processing chain for the effective monitoring of structures and infrastructures

    Science.gov (United States)

    Bonano, Manuela; Buonanno, Sabatino; Ojha, Chandrakanta; Berardino, Paolo; Lanari, Riccardo; Zeni, Giovanni; Manunta, Michele

    2017-04-01

    The advanced DInSAR technique referred to as Small BAseline Subset (SBAS) algorithm has already largely demonstrated its effectiveness to carry out multi-scale and multi-platform surface deformation analyses relevant to both natural and man-made hazards. Thanks to its capability to generate displacement maps and long-term deformation time series at both regional (low resolution analysis) and local (full resolution analysis) spatial scales, it allows to get more insights on the spatial and temporal patterns of localized displacements relevant to single buildings and infrastructures over extended urban areas, with a key role in supporting risk mitigation and preservation activities. The extensive application of the multi-scale SBAS-DInSAR approach in many scientific contexts has gone hand in hand with new SAR satellite mission development, characterized by different frequency bands, spatial resolution, revisit times and ground coverage. This brought to the generation of huge DInSAR data stacks to be efficiently handled, processed and archived, with a strong impact on both the data storage and the computational requirements needed for generating the full resolution SBAS-DInSAR results. Accordingly, innovative and effective solutions for the automatic processing of massive SAR data archives and for the operational management of the derived SBAS-DInSAR products need to be designed and implemented, by exploiting the high efficiency (in terms of portability, scalability and computing performances) of the new ICT methodologies. In this work, we present a novel parallel implementation of the full resolution SBAS-DInSAR processing chain, aimed at investigating localized displacements affecting single buildings and infrastructures relevant to very large urban areas, relying on different granularity level parallelization strategies. The image granularity level is applied in most steps of the SBAS-DInSAR processing chain and exploits the multiprocessor systems with distributed

  7. Hydrogen effects in stainless steel

    International Nuclear Information System (INIS)

    Caskey, G.R. Jr.

    1983-01-01

    The effects of hydrogen on stainless steels have been reviewed and are summarized in this paper. Discussion covers hydrogen solution and transport in stainless steels as well as the effects of hydrogen on deformation and fracture under various loading conditions. Damage is caused also by helium that arises from decay of the hydrogen isotope tritium. Austenitic, ferritic, martensite, and precipitation-hardenable stainless steels are included in the discussion. 200 references

  8. Uma análise da dinâmica inflacionária brasileira

    Directory of Open Access Journals (Sweden)

    Francisco Cribari-Neto

    2005-12-01

    Full Text Available O objetivo central do presente artigo é analisar a dinâmica inflacionária brasileira e medir o grau de inércia em tal dinâmica. De início, nós apresentamos resultados de simulação de Monte Carlo sobre o desempenho em amostras finitas de diferentes variantes da razão de variâncias, uma medida comumente utilizada para a mensuração de persistência de choques no longo prazo. As simulações são realizadas sob inovações normais e não-normais e também com e sem outliers e inliers. Os resultados favorecem uma particular variante robusta da razão de variâncias proposta neste artigo. Os resultados empíricos para o Brasil indicam que o grau de inércia inflacionária neste país é substancialmente maior do que aquele encontrado por Campêlo e Cribari-Neto (Revista Brasileira de Economia, 57, 713-739, 2003; de fato, em alguns períodos da história econômica brasileira recente nós encontramos inércia plena. Todavia, o grau de inércia inflacionária após a implementação do Plano Real é de segunda ordem. Nós analisamos também as dinâmicas inflacionárias da Argentina, Chile e México.The chief goal of this paper is to analyze the Brazilian inflationary dynamics, and to measure the degree of inertia in such dynamics. To that end, we start by reporting Monte Carlo simulation results on the finite-sample performance of different variants of the variance ratio, a well know measure of long-run persistence of shocks. The simulations are performed under normal and nonnormal innovations, and also with and without outliers and inliers. Overall, the results favor a robust variant of the variance ratio we propose. The empirical results for Brazil suggest that the degree of inertia in this country is substantially larger than what was found by Campêlo and Cribari-Neto (Revista Brasileira de Economia 57, 713-739, 2003; indeed, in several periods of the recent economic history we find full inertia. However, the degree of inertia since

  9. Dinámica de la identidad, acción y contexto

    Directory of Open Access Journals (Sweden)

    Anne Marie Costalat-Founeau

    2007-06-01

    Full Text Available La identidad social no puede ser considerada más como una imagen fijada y estática que determina las representaciones individuales y/o colectivas. Se inserta, más bien, dentro de una dinámica de representaciones que está marcada por fases biográficas y sociales. Esta impresión social está en parte construida por la experiencia personal impresa en los recuerdos, y transfiere una realidad experiencial a la identidad. La acción participa en esta concretización y también la refuerza: es así que el carácter normativo de la acción parece reforzar su propia manifestación y, por lo tanto, su efecto. Esos efectos tienen un poder central en la dinámica de la identidad. La acción se ubica en el centro de la subjetividad, pues pone en relación las aspiraciones, las representaciones y también los valores y el sentimiento de capacidad: la acción favorece una relación estrecha entre los factores afectivos y cognitivos. Esos factores actúan en conjunto elaborando regulaciones dinámicas y organizando fases de identidad más o menos conflictivas. Se presentan los efectos de la acción sobre la subjetividad.---Social identity should not be considered anymore as a fixed and static image that defines individual or collective representations. It is embedded within a representational dynamic where biographical and social phases left their marks. This social imprint is partly made by the experience ingrained in the remembrance that gives all its experiential reality to identity. Action participates and reinforces this concreteness. It seems that the prescriptive nature of action reinforces its presence and therefore its effects. More precisely, these effects, which are inherent to action, possess a central power in the identity dynamic. Action is at the heart of subjectivity in the sense that it connects aspirations, representations, as well as the values of the individual and the sense of his own capacity. It involves the tight interweaving of

  10. The DinB•RecA complex of Escherichia coli mediates an efficient and high-fidelity response to ubiquitous alkylation lesions.

    Science.gov (United States)

    Cafarelli, Tiziana M; Rands, Thomas J; Godoy, Veronica G

    2014-03-01

    Alkylation DNA lesions are ubiquitous, and result from normal cellular metabolism as well as from treatment with methylating agents and chemotherapeutics. DNA damage tolerance by translesion synthesis DNA polymerases has an important role in cellular resistance to alkylating agents. However, it is not yet known whether Escherichia coli (E. coli) DNA Pol IV (DinB) alkylation lesion bypass efficiency and fidelity in vitro are similar to those inferred by genetic analyses. We hypothesized that DinB-mediated bypass of 3-deaza-3-methyladenine, a stable analog of 3-methyladenine, the primary replication fork-stalling alkylation lesion, would be of high fidelity. We performed here the first kinetic analyses of E. coli DinB•RecA binary complexes. Whether alone or in a binary complex, DinB inserted the correct deoxyribonucleoside triphosphate (dNTP) opposite either lesion-containing or undamaged template; the incorporation of other dNTPs was largely inefficient. DinB prefers undamaged DNA, but the DinB•RecA binary complex increases its catalytic efficiency on lesion-containing template, perhaps as part of a regulatory mechanism to better respond to alkylation damage. Notably, we find that a DinB derivative with enhanced affinity for RecA, either alone or in a binary complex, is less efficient and has a lower fidelity than DinB or DinB•RecA. This finding contrasts our previous genetic analyses. Therefore, mutagenesis resulting from alkylation lesions is likely limited in cells by the activity of DinB•RecA. These two highly conserved proteins play an important role in maintaining genomic stability when cells are faced with ubiquitous DNA damage. Kinetic analyses are important to gain insights into the mechanism(s) regulating TLS DNA polymerases. Copyright © 2013 Wiley Periodicals, Inc.

  11. Milled Die Steel Surface Roughness Correlation with Steel Sheet Friction

    DEFF Research Database (Denmark)

    Berglund, J.; Brown, C.A.; Rosén, B.-G.

    2010-01-01

    This work investigates correlations between the surface topography ofmilled steel dies and friction with steel sheet. Several die surfaces were prepared by milling. Friction was measured in bending under tension testing. Linear regression coefficients (R2) between the friction and texture...

  12. Mathematical instrumentation in fourteenth-century Egypt and Syria the illustrated treatise of Najm al-Din al-Misri

    CERN Document Server

    Charette, F

    2003-01-01

    An illustrated Arabic treatise, with an English translation and detailed commentary, on the construction of over 100 various astronomical instruments, many of which are otherwise unknown to specialists. It was composed by Najm al-Din al-Misri, a rather shadowy figure, in Cairo around 1330 CE.

  13. Sistemas dinámicos en la interacción emocional madre-hijo: primera fase

    Directory of Open Access Journals (Sweden)

    Jaime Castro Martínez

    2013-03-01

    Full Text Available Los avances en psicología de las emociones y psicología del desarrollo han exigido nuevos cambios tanto de orden teórico como metodológico para describir y explicar la variabilidad de las res-puestas infantiles a los cambios que tienen lugar en la dinámica socio-emocional con la madre. Producto de estas variaciones, aparece la integración de los sistemas dinámicos a las descrip- ciones de los teóricos del desarrollo emocional bajo supuestos psicobiológicos y sociobiológicos. Esta investigación indaga el posible uso de modelos de sistemas dinámicos en la generación de patrones de organización durante la interrelación socio- emocional madre-hijo, bajo cambios en los estados emocionales de la madre y bajo modificaciones debidas al desarrollo infantil. Los hallazgos de esta primera fase muestran algunas diferencias en las dinámicas socio-emocionales en cada uno de los estados emocionales maternos, al igual que regu- laridades en la variación por estado emocional. La investigación sugiere ampliar el marco teórico hacia modelos de componentes emocionales y modelos neurobiológicos, y la inclusión de modelos matemáticos de predicción y de análisis de series de tiempos.

  14. Steels for nuclear power. I

    International Nuclear Information System (INIS)

    Bohusova, O.; Brumovsky, M.; Cukr, B.; Hatle, Z.; Protiva, K.; Stefec, R.; Urban, A.; Zidek, M.

    1976-01-01

    The principles are listed of nuclear reactor operation and the reactors are classified by neutron energy, fuel and moderator designs, purpose and type of moderator. The trend and the development of light-water reactor applications are described. The fundamental operating parameters of the WWER type reactors are indicated. The effect is discussed of neutron radiation on reactor structural materials. The characteristics are described of steel corrosion due to the contact of the steel with steam or sodium in the primary coolant circuit. The reasons for stress corrosion are given and the effects of radiation on corrosion are listed. The requirements and criteria are given for the choice of low-alloy steel for the manufacture of pressure vessels, volume compensators, steam generators, cooling conduits and containment. A survey is given of most frequently used steels for pressure vessels and of the mechanical and structural properties thereof. The basic requirements for the properties of steel used in the primary coolant circuit are as follows: sufficient strength in operating temperature, toughness, good weldability, resistance to corrosion and low brittleness following neutron irradiation. The materials are listed used for the components of light-water and breeder reactors. The production of corrosion-resistant steels is discussed with a view to raw materials, technology, steel-making processes, melting processes, induction furnace steel-making, and to selected special problems of the chemical composition of steels. The effects are mainly discussed of lead, bismuth and tin as well as of some other elements on hot working of high-alloy steels and on their structure. The problems of corrosion-resistant steel welding and of pressure vessel cladding are summed up. Also discussed is the question of the concept and safeguards of the safety of nuclear installation operation and a list is presented of most commonly used nondestructive materials testing methods. The current

  15. La personalidad de las sociedades : descripción y dinámica

    OpenAIRE

    Amigó Borrás, Salvador; Caselles Moncho, Antonio; Micó i Ruiz, Joan Carles

    2018-01-01

    La Extraversión es considerada como la dimensión fundamental y básica de la personalidad desde la Teoría del Rasgo Único de Personalidad [1]. La Extraversión, como dimensión temperamental, engloba dimensiones cognitivas como la racionalidad y la emocionalidad. La teoría de los tipos de Carl Jung [2] establece una dinámica compleja entre estas dimensiones, a partir de la cual se obtiene una tipología de la personalidad. Amigó [3] adaptó la teoría de Jung para aplicarla a las sociedades. Así, a...

  16. Influencia del modelo elástico en la dinámica de estructuras articuladas

    Directory of Open Access Journals (Sweden)

    Muñoz, M.

    1997-06-01

    Full Text Available Influence in the dynamics of an articulated structure of sweep wooden, of the approximation to the material tension-deformation properties. A time-domain calculation method by finite differences has been used with a model of lumped masses in the nodes.

    Se estudia la influencia en la dinámica de una estructura articulada de barras de madera, de la aproximación a las propiedades tensión-deformación del material. Se ha adoptado un método de cálculo por diferencias finitas en el dominio del tiempo, con un modelo de masas concentradas en los nodos.

  17. Neutron spectrometry and dosimetry measurement at workplaces for calibration of individual PGP-DIN dosemeters

    International Nuclear Information System (INIS)

    Itie, C.; Muller, H.; Asselineau, B.; Medioni, R.; Crovisier, P.; Valier-Bradier, P.; Groetz, J.E.; Piot, J.

    2003-01-01

    Measurements to determine new coefficients for individual neutron dosimeters PGP-DIN complying with the ICRP 60 recommendations were performed at two workplaces at the CEA of Valduc: a storage room and a plutonium reprocessing plant. Two spectrometry campaigns were performed allowing a better assessment of doses received by operators working at these workplaces. Neutron energy fluence and ambient dose equivalent rate H * (10) distributions were measured as function of neutron energy by using the ROSPEC device and BONNER spheres spectrometer. The radiation field being mixed neutron and gamma, the gamma component was also evaluated: neutron and photon dose-rate meters were used to evaluate the ambient dose rate equivalent. Individual dosemeters were positioned on an ISO water slab phantom. In addition, calculations were performed using the MCNP simulation code for different configurations. (authors)

  18. Diseño, branding y dinámicas socioculturales

    Directory of Open Access Journals (Sweden)

    Alzate Sanz, Jaime Eduardo

    2014-07-01

    Full Text Available Actualmente, las regiones de conocimiento se caracterizan por ser territorios donde confluyen proyectos importantes que tienen que ver con las tecnologías, la cultura y el conocimiento. Las políticas de gobierno, el emprendimiento, el trabajo con el conocimiento proyectado desde las universidades y grupos de investigación alimentan constantemente la actividad cultural; a pesar de estas dinámicas, es posible que en muchas regiones de conocimiento el branding no se realice de manera rigurosa. De acuerdo a lo anterior, es importante reflexionar sobre la relación del diseño y el branding en las regiones eje de conocimiento, teniendo en cuenta la responsabilidad social de las marcas y la importancia del sujeto como integrante proactivo de la cultura

  19. Unsupervised DInSAR processing chain for multi-scale displacement analysis

    Science.gov (United States)

    Casu, Francesco; Manunta, Michele

    2016-04-01

    Earth Observation techniques can be very helpful for the estimation of several sources of ground deformation due to their characteristics of large spatial coverage, high resolution and cost effectiveness. In this scenario, Differential Synthetic Aperture Radar Interferometry (DInSAR) is one of the most effective methodologies for its capability to generate spatially dense deformation maps at both global and local spatial scale, with centimeter to millimeter accuracy. DInSAR exploits the phase difference (interferogram) between SAR image pairs relevant to acquisitions gathered at different times, but with the same illumination geometry and from sufficiently close flight tracks, whose separation is typically referred to as baseline. Among several, the SBAS algorithm is one of the most used DInSAR approaches and it is aimed at generating displacement time series at a multi-scale level by exploiting a set of small baseline interferograms. SBAS, and generally DInSAR, has taken benefit from the large availability of spaceborne SAR data collected along years by several satellite systems, with particular regard to the European ERS and ENVISAT sensors, which have acquired SAR images worldwide during approximately 20 years. Moreover, since 2014 the new generation of Copernicus Sentinel satellites has started to acquire data with a short revisit time (12 days) and a global coverage policy, thus flooding the scientific EO community with an unprecedent amount of data. To efficiently manage such amount of data, proper processing facilities (as those coming from the emerging Cloud Computing technologies) have to be used, as well as novel algorithms aimed at their efficient exploitation have to be developed. In this work we present a set of results achieved by exploiting a recently proposed implementation of the SBAS algorithm, namely Parallel-SBAS (P-SBAS), which allows us to effectively process, in an unsupervised way and in a limited time frame, a huge number of SAR images

  20. Comportamiento dinámico de puentes en arco con amortiguadores viscosos

    Directory of Open Access Journals (Sweden)

    Nicolás Parra García

    2007-11-01

    Full Text Available En éste trabajo se presenta la respuesta sísmica analítica de dos puentes en arco de gran luz, sometiéndolos a un movimiento simulado que incluye efectos de fuente cercana. Para reducir la respuesta se exploró su comportamiento conectando los dos extremos del tablero con la subestructura por medio de amortiguadores viscosos. Se llevaron a cabo una serie de análisis en el plano de ambos modelos para identificar los amortiguadores óptimos. Los resultados indicaron que el uso de amortiguadores viscosos con comportamiento no lineal, ofrece una solución práctica para reducir la respuesta dinámica de estas estructuras.

  1. Dinámicas del reconocimiento en las narraciones de jóvenes con discapacidades

    Directory of Open Access Journals (Sweden)

    Aleida Fernández

    2012-05-01

    Full Text Available La investigación que dio origen a este artículo se centra en una lectura de ladiscapacidad desde una perspectiva moral, específicamente basada en la Ética del Reconocimientopropuesta por Axel Honneth. Recogemos y analizamos algunas de las dinámicas y de las luchas por elreconocimiento desde el punto de vista de un grupo de 25 jóvenes con discapacidades que aspirabana entrar a la Universidad Nacional de Colombia. Estos sujetos jóvenes participaron en grupos deconversación, y seis de ellos fueron entrevistados individualmente sobre el tema de sus experienciasautobiográficas. Concluimos que estos jóvenes y estas jóvenes reivindican su condición de sujetosapreciados por ellos mismos, reconocidos jurídicamente en equidad y valorados socialmente por susaportes.

  2. Implementation of standards at a research institute. Storage and keeping of radioactive materials following DIN 25422

    International Nuclear Information System (INIS)

    Koeble, T.; Weinand, U.

    2016-01-01

    The secure storage and keeping of radioactive materials is increasingly important especially in times of a growing threat by terrorists. Authorities and users are jointly recommended to adapt the storage and keeping of radioactive materials to increasing security requirements. Here the different possibilities to fulfil the requirements regarding fire prevention and theft prevention which in Germany are set by DIN 25422 were determined for the radioactive materials and their storage and keeping places present in a research institute. The required measures were than agreed about with the relevant authority. Difficulties which are occurring due to the demanding combination of requirements out of the areas of radiation protection, fire prevention, and theft prevention are discussed. The storage and keeping of radioactive materials especially such of high activity requires a high level of security which must be continuously adapted to rising requirements.

  3. Um caso de transtorno de personalidade borderline atendido em psicoterapia dinâmica breve

    Directory of Open Access Journals (Sweden)

    Cunha Paulo Jannuzzi

    2001-01-01

    Full Text Available Trata-se de um caso de Transtorno de Personalidade Borderline, encaminhado para a área de Psicoterapia Dinâmica Breve (PDB do Centro de Psicologia Aplicada da UNESP - Bauru/SP. O foco delimitado consistiu em trabalhar as características depressivas do paciente, buscando ajudá-lo a elaborar o luto pela perda de sua mãe. A análise deste caso veio corroborar a hipótese de que pacientes com transtorno de personalidade borderline também podem ser beneficiados com a PDB. A peculiaridade desta modalidade de atendimento está relacionada ao estabelecimento de objetivos terapêuticos (foco condizentes com as reais possibilidades e limites de cada paciente.

  4. A dinâmica locacional da avicultura e suinocultura no centro-oeste brasileiro.

    OpenAIRE

    Leopoldo Viriato Saboya

    2001-01-01

    Visando investigar a dinâmica locacional das empresas dos complexos aves e suínos estabelecidas na região Centro-Oeste brasileira, foi conduzida uma pesquisa empírica do processo de decisão locacional e dos fatores-chave na escolha do local produtivo, tendo como referencial teórico uma abordagem comportamental da Teoria da Localização. A pressuposição central deste estudo é a de que os preços mais baixos das matérias-primas básicas (em especial o milho) nos estados da região Centro-Oeste não ...

  5. [Quality management according to DIN EN ISO 9001 at a university eye hospital].

    Science.gov (United States)

    Schönherr, U; Händel, A; Naumann, G O

    2001-02-01

    Quality assurance is an integral part of modern microsurgical ophthalmology. Health care laws also mandate overall quality management. In recent years we have standardized the preexisting features of quality management according DIN EN ISO 9001 and have integrated previously missing features. Establishing quality management according to ISO 9001 is possible even at a university eye hospital and department of ophthalmology. Certification according to ISO 9001 specifications was granted in April 1999. The major difficulty was in translating industrial norms to the context of an eye hospital. It was also difficult to overcome skepticism towards quality-assurance measures that lie beyond ophthalmological quality control. It is useful and feasible to establish a quality management system at German university eye hospitals and departments of ophthalmology. Certification according to ISO 9001 is one possibility to make a quality management system transparent and evaluable both inside and outside the hospital.

  6. Dinâmicas sociais e estados de humor Social dynamics and mood states

    Directory of Open Access Journals (Sweden)

    Flávio Rebustini

    2012-06-01

    Full Text Available O objetivo do estudo foi avaliar as relações das dinâmicas sociais (família, amigos e escola; i.e., três fatores sociais sobre os estados de humor. A pesquisa foi realizada com uma equipe feminina de voleibol (14/15 anos. Aplicou-se o teste POMS (Profile of Mood States para mensurar os estados de humor. Foi utilizada uma escala de 1 (muito mal a 5 (muito bem para que as atletas avaliassem cada um dos três fatores. Os resultados apontaram correlações significativas entre as escalas e os estados de humor; e diferenças significativas entre os níveis de intensidade apontados na escala dos três fatores e os estados de humor. Os resultados indicam clara interferência das dinâmicas sociais sobre os estados de humor, portanto, as interferências sociais não podem ser descartadas na preparação do atleta.The aim of this study was to evaluate the impact of social dynamics (family, friends and school; i.e., three social factors on mood states. The survey was conducted with a women's volleyball team (14/15 years. The POMS test (Profile of Mood States was employed to measure the team's mood states. The athletes assessed the three factors by the use of a Likert scale ranging from 1 (very bad to 5 (very good. Results showed significant correlations between scales and mood states, and significant differences between the intensity levels representing their moods for each of the three factors. The results show clear interference of social dynamics on the mood states. Therefore, social interference cannot be ignored during an athlete's training program.

  7. Reconfiguração dinâmica de linhas de montagem

    Directory of Open Access Journals (Sweden)

    Ormeu Coelho da Silva Júnior

    2010-04-01

    Full Text Available Neste trabalho se propõe um novo problema envolvendo linhas de montagem. Nele se considera a necessidade de reconfiguração devido à mudança no tempo de ciclo requerido. Para tratá-lo, foram propostos quatro modelos de programação inteira mista, sendo três deles baseados em um horizonte de planejamento discretizado em períodos, o que dá ao problema um caráter dinâmico. Simultaneamente, força-se a suavização da carga de trabalho entre as estações, limitando-a com valores mínimos e máximos. Os modelos foram implementados em um pacote comercial de programação matemática e os resultados de alguns testes preliminares são reportados. Comparações entre o uso sucessivo de abordagens clássicas (tipo SALBP e a modelagem dinâmica demonstram a superioridade da abordagem proposta.In this paper we present a new problem involving assembly lines. It arises when successive variations in the cycle time force line re-configuration. We propose four mixed integer programming formulations for the problem, three of them using a time horizon divided in periods. Such assumption gives the problem a dynamic character. The models try to smooth the workload among the stations by forcing it to fall between minimum and maximum values predefined by the user. They were implemented in a commercial package for mathematical programming and some results are reported. Comparisons were made against the repetitive use of classical models (SALBP like to demonstrate the superiority of this new approach.

  8. FACULTĂȚILE DE LA UNIVERSITATEA DIN CERNĂUȚI (1875-1919

    Directory of Open Access Journals (Sweden)

    Constantin UNGUREANU

    2017-08-01

    Full Text Available În perioada 1875-1919, Universitatea din Cernăuţi a funcţionat cu trei facultăţi: teologie ortodoxă, drept şi filozofie. Un rol aparte în cadrul Universităţii l-a îndeplinit Facultatea de Teologie Ortodoxă. La această facultate au activat 15 pro­fesori titulari, dintre care 13 români şi doi ucraineni. Facultatea de Drept a fost cea mai bine frecventată. Facultatea de Filozofie din Cernăuţi a cuprins mai multe secţii: filozofie, istorie, filologie şi lingvistică, matematică şi ştiinţe naturale, limbi moderne, fizică, chimie. În ajunul războiului, la această facultate activau 28 de catedre, dintre care 16 în domeniul ştiinţelor filologice şi istorice şi 12 în domeniul ştiinţelor naturale.FACULTIES AT THE UNIVERSITY OF CHERNIVTSI (1875-1919During 1875-1919,ChernivtsiUniversitywas comprised of three faculties: orthodox theology, law and philosophy. The Faculty of Orthodox Theology played a special role within the University. This department was comprised of 15 full professors, of which 13 were Romanian and 2 Ukrainians. Faculty of Law was the best frequented. The Faculty of Philosophy in Chernivtsi was comprised of several departments such as philosophy, history, philology and linguistics, mathematics and natural sciences, modern languages, physics and chemistry. Just before the Great War, this Faculty was comprised of 28 departments of which 16 were specialized in philology and history while 12 were specialized in the natural sciences.

  9. Dinámica de la fuerza de trabajo en Cuba 1846-1931 (II

    Directory of Open Access Journals (Sweden)

    Orestes Gárciga Gárciga

    2014-06-01

    Full Text Available En «Dinámica de la fuerza de trabajo en Cuba 1846-1931» se estudia el procesamiento de los datos estadísticos que, acerca de la actividad laboral de la población, presentaron los censos de 1846, 1862, 1899, 1907, 1919 y 1931. Debido a su extensión, la obra ha sido dividida en tres partes para ser publicada en Novedades en Población. El presente artículo examina la evolución de la fuerza de trabajo en Cuba de 1846 a 1931, a través de diversas clasificaciones internacionales empleadas en estos estudios, y da continuidad a «Dinámica de la fuerza de trabajo en Cuba 1846-1931 (I», incluido en el número anterior de la revista (Año 9, Número 17, 2013. Abstract In «Dynamic of the workforce in Cuba 1846-1931» is studied the processing of statistical data showed by the 1846, 1862, 1899, 1907, 1919 and 1931 censuses about labor activity of the population. Due to its extension, this work has been divided in three parts so it can be published in Novedades en Población (News on Population. The current paper reviews the evolution of the work force in Cuba from 1846 to 1931, taking to account diverse international classifications used in this studies. It is the continuation of «Dynamic of the workforce in Cuba 1846-1931 (I», included in the previous number of this magazine.

  10. Diabetes na infância / adolescência: conhecendo a dinâmica familiar

    Directory of Open Access Journals (Sweden)

    Michelle Darezzo Rodrigues Nunes

    2007-04-01

    Full Text Available A doença crônica apresenta como peculiaridades marcantes duração e risco de complicações, exigindo cuidados permanentes, colocando em evidência o papel da família, principalmente quando se refere à criança. Neste estudo objetivamos identificar quais os significados que a situação de doença crônica, diabetes, gera na dinâmica familiar. O referencial teórico e metodológico foram INTERACIONISMO SIMBÓLICO e TEORIA FUNDAMENTADA NOS DADOS, respectivamente. A pesquisa foi realizada no primeiro semestre de 2004, com seis famílias, entrevistadas com a questão norteadora “O que mudou na dinâmica familiar após a descoberta do diabetes do filho?” Na categorização dos dados identificamos 4 grandes temas: “Vida girando em torno da doença do filho” a descoberta da doença insere-se na história da família como algo que divide a vida em antes e depois; “Buscando algo que os fortaleça” refere-se ao conhecimento e equilíbrio emocional para cuidar do filho; “Precisando alterar a rotina” a mudança é inevitável e radical, sendo a alimentar a mais evidente; “Convivendo com o perigo” é vivenciar constante preocupação com as descompensações. Cada vez mais é necessário, para a enfermagem e demais profissionais da saúde, compreender as demandas de cuidado manifestadas pela família de modo a desenvolver ações que tenham ressonância efetiva sobre essa população.

  11. Advanced Differential Radar Interferometry (A-DInSAR) as integrative tool for a structural geological analysis

    Science.gov (United States)

    Crippa, B.; Calcagni, L.; Rossi, G.; Sternai, P.

    2009-04-01

    Advanced Differential SAR interferometry (A-DInSAR) is a technique monitoring large-coverage surface deformations using a stack of interferograms generated from several complex SLC SAR images, acquired over the same target area at different times. In this work are described the results of a procedure to calculate terrain motion velocity on highly correlated pixels (E. Biescas, M. Crosetto, M. Agudo, O. Monserrat e B. Crippa: Two Radar Interferometric Approaches to Monitor Slow and Fast Land Deformation, 2007) in two area Gemona - Friuli, Northern Italy, Pollino - Calabria, Southern Italy, and, furthermore, are presented some consideration, based on successful examples of the present analysis. The choice of these pixels whose displacement velocity is calculated depends on the dispersion index value (DA) or using coherence values along the stack interferograms. A-DInSAR technique allows to obtain highly reliable velocity values of the vertical displacement. These values concern the movement of minimum surfaces of about 80m2 at the maximum resolution and the minimum velocity that can be recognized is of the order of mm/y. Because of the high versatility of the technology, because of the large dimensions of the area that can be analyzed (of about 10000Km2) and because of the high precision and reliability of the results obtained, we think it is possible to exploit radar interferometry to obtain some important information about the structural context of the studied area, otherwise very difficult to recognize. Therefore we propose radar interferometry as a valid investigation tool whose results must be considered as an important integration of the data collected in fieldworks.

  12. A dinâmica dos homicídios no Nordeste e em Pernambuco

    Directory of Open Access Journals (Sweden)

    José Maria Nóbrega Júnior

    2010-10-01

    Full Text Available O objetivo deste artigo é analisar a dinâmica das mortes por homicídio no Nordeste, região mais violenta do país em termos desse tipo de crime. Indicadores de homicídios foram analisados para todos os estados nordestinos, com ênfase em Pernambuco. A análise dos números demonstra um crescimento das mortes violentas e intencionais na região pelo menos desde o início da década de 1990, com maior impacto nos últimos 10 anos, chegando a ultrapassar os números do Sudeste em 2006. Buscou-se tabular esses números por grupos como faixa etária, nível de escolaridade e por regiões de Pernambuco, revelando-se as diferentes dimensões dessa dinâmica. The aim of the article The dynamics of homicides in the Northeast and Pernambuco is to review the dynamics of deaths by homicide in the Northeast ofBrazil, the most violent region in the country in terms of this kind of crime. Murder rates were analysed for all the North-eastern states, with special focus on Pernambuco. The statistical analysis shows a growth in violent and intentional deaths in the region at least since the start of the 1990s, peaking in the last 10 years and surpassing the figures for the Southeast in 2006. Associations were then sought with groups like age group, level of schooling and by regions of Pernambuco, revealing the different dimensions of the dynamics.

  13. A Mobilização de Capacidades Dinâmicas na Lojas Renner

    Directory of Open Access Journals (Sweden)

    Adalberto Escalona Gonçalves Garcia

    2014-03-01

    Full Text Available O artigo tem como objetivo analisar a trajetória de uma das empresas varejistas de maior destaque no mercado brasileiro, através de um estudo longitudinal que enfatiza a mobilização de seus recursos e capacidades ao longo de 90 anos de história. Explorando o conceito de capacidades dinâmicas, descrevem-se as ações estratégicas empreendidas em momentos de crescimento e de crise. Para tanto, foram realizadas entrevistas em profundidade com dez tomadores de decisão que vivenciaram diferentes momentos da história da empresa e que desempenharam distintos papéis nos últimos 50 anos. Além disso, dado o aspecto histórico da pesquisa, especial ênfase foi dada à obtenção e à análise de dados secundários. Boletins internos, comunicados ao mercado de capitais, relatórios anuais, demonstrações financeiras, artigos da mídia, entre outras fontes, totalizaram mais cerca de 600 páginas de material analisado. No que diz respeito às contribuições teóricas, a pesquisa identificou a existência de quatro mecanismos de mobilização das capacidades dinâmicas: a alavancagem, a criação, o acesso e a liberação de recursos e de capacidades. Com relação às implicações gerenciais, o estudo mostrou que habilidades dos gestores vinculadas seletivamente aos quatro mecanismos de mobilização se tornam essenciais na condução de uma empresa em seus momentos, tanto de estabilidade e crescimento, quanto de turbulência. DOI:10.5585/riae.v13i1.2029

  14. Barandillas de protección personal con solicitación dinámica

    Directory of Open Access Journals (Sweden)

    Pomares, J. C.

    2013-06-01

    Full Text Available Safety guardrails with dynamic loads, B and C types conforming EN 13374, are devices used as collective protection for people against height falls and for retaining materials. This system can include a safety net anchored to a support structure for its vertical use (U system, EN 1263. In this paper, fundamental aspects are analysed, as design, mechanical requirements and solution for the hard points that arise at supports of the system, able to seriously injure falling people. So, a ballast fall against this system has been studied, by modelling it with dynamic finite elements and analytical kinetic considerations, to obtain useful conclusions about geometry, cross section of the supports, maximum deflection and impact factor over the injured. It allows to suggest normative text improvements.Las barandillas de seguridad con solicitación dinámica, tipos B y C según UNE-EN 13374, son el conjunto de componentes destinados a la protección colectiva de las personas contra las caídas a un nivel inferior y a retener materiales. Frecuentemente incorporan una red de seguridad. En este artículo se analizan aspectos fundamentales como su diseño, sus requisitos mecánicos y la solución a la problemática que suponen los soportes o puntos duros capaces de producir lesiones al accidentado. Para este fin, se ha estudiado el fenómeno de la caída de un lastre sobre tales redes con distintos modelos numéricos de elementos finitos en régimen dinámico y mediante consideraciones analíticas cinemáticas, obteniendo conclusiones útiles como la forma geométrica necesaria, la escuadría de los perfiles que constituyen el bastidor de la red, y los factores de impacto que sufren los accidentados. Ello permite sugerir mejoras al texto normativo.

  15. Categoria etnică din perspectivă lingvistică

    Directory of Open Access Journals (Sweden)

    Răzvan Săftoiu

    2017-03-01

    Full Text Available În această lucrare, propun analiza din perspectivă lingvistică a construcției unei categorii etnice din România care este denumită prin cel puțin doi termeni: țigan și rom. Conceptul de categorie se referă la membrii unui anumit grup care se diferențiază de alte grupuri printr-un set de elemente specifice recunoscute la nivelul unei comunități mai largi. În interacțiune, indivizii apelează frecvent la categorii și la setul de trăsături pe care îl poartă o anumită categorie, deoarece este mai ușor de operat cu seturi de cunoștințe decît cu referințe pentru fiecare individ în parte. Analiza are la bază o serie de expresii și locuțiuni, proverbe și glume care au circulat (sau încă mai circulă în spațiul românesc și care au conturat, la nivelul mentalității colective, imaginea unei categorii etnice a cărei denumire (încă oscilează între doi termeni. Textele au fost grupate în funcție de diverse stereotipuri asociate categoriei etnice avute în vedere, evidențiind conotațiile peiorative ale utilizărilor termenului țigan în raport cu categoria etnică rom, o categorie „goală” de semnificație, care poate fi „umplută” cu elemente ce pot creiona o imagine pozitivă.

  16. Gestión dinámica de conocimiento organizacional

    Directory of Open Access Journals (Sweden)

    José Francisco Mirabal

    2015-08-01

    Full Text Available La presente investigación propone elementos que guían la conformación de organizaciones dinámicas en conocimiento de comportamiento inteligente, a partir del desarrollo de capacidades y estructuras distintivas articuladas que agregan valor diferenciador en la organización. Para ello, se efectuó un estudio no experimental donde se aplicó un modelo mixto complejo, que consistió en una revisión documental para identificar elementos del marco estratégico-táctico de sustentación, un intercambio con expertos con los fines de determinar aspectos mediadores, socializadores de sustento cognitivo y la elaboración de un estudio proyectivo para proponer soluciones que permitan una forma ágil de construir conocimiento para la acción. En el análisis se observó, que la gestión de conocimiento está condicionada mayormente por dominios cognitivos aislados, es poco socializada, no está generalmente interrelacionada con hechos significativos internos o externos y habitualmente, la información requerida, está desagregada en sistemas aislados. Asimismo, se prevé que para asimilar la alta variabilidad del entorno dar agilidad operacional, así como también facilitar la organización interna, es imprescindible articular objetos de conocimiento mediante estructuras integradas sistémicamente para que exista interconexión ágil desde la perspectiva individual, grupal y organizacional, tanto interna como externa para inducir de manera inteligente conocimiento que en forma dinámica genere acciones acertadas en tiempo real

  17. Steel designers' handbook

    CERN Document Server

    Gorenc, Branko; Tinyou, Ron

    2012-01-01

    The Revised 7th Edition of Steel Designers' Handbook is an invaluable tool for all practising structural, civil and mechanical engineers as well as engineering students at university and TAFE in Australia and New Zealand. It has been prepared in response to changes in the design Standard AS 4100, the structural Design Actions Standards, AS /ANZ 1170, other processing Standards such as welding and coatings, updated research as well as feedback from users. This edition is based on Australian Standard (AS) 4100: 1998 and subsequent amendments. The worked numerical examples in the book have been e

  18. The industrial ecology of steel

    Energy Technology Data Exchange (ETDEWEB)

    Considine, Timothy J.; Jablonowski, Christopher; Considine, Donita M.M.; Rao, Prasad G.

    2001-03-26

    This study performs an integrated assessment of new technology adoption in the steel industry. New coke, iron, and steel production technologies are discussed, and their economic and environmental characteristics are compared. Based upon detailed plant level data on cost and physical input-output relations by process, this study develops a simple mathematical optimization model of steel process choice. This model is then expanded to a life cycle context, accounting for environmental emissions generated during the production and transportation of energy and material inputs into steelmaking. This life-cycle optimization model provides a basis for evaluating the environmental impacts of existing and new iron and steel technologies. Five different plant configurations are examined, from conventional integrated steel production to completely scrap-based operations. Two cost criteria are used to evaluate technology choice: private and social cost, with the latter including the environmental damages associated with emissions. While scrap-based technologies clearly generate lower emissions in mass terms, their emissions of sulfur dioxide and nitrogen oxides are significantly higher. Using conventional damage cost estimates reported in the literature suggests that the social costs associated with scrap-based steel production are slightly higher than with integrated steel production. This suggests that adopting a life-cycle viewpoint can substantially affect environmental assessment of new technologies. Finally, this study also examines the impacts of carbon taxes on steel production costs and technology choice.

  19. Stainless steels low temperature nitriding

    International Nuclear Information System (INIS)

    Roux, T.; Darbeida, A.; Von Stebut, J.; Michel, H.; Lebrun, J.P.; Hertz, D.

    1995-01-01

    Nitrogen ions implantation of 316L stainless steel leads to monophasic diffusion layers, which are constituted of a solid solution (γ N ) fcc, metastable, nitrogen sur-saturated, and without order. This article shows that for 316L stainless steels,these layers improve the tribological properties without degradation of the corrosion resistance. (A.B.). 13 refs. 6 figs

  20. Metadynamic recrystallization in C steels

    Indian Academy of Sciences (India)

    Unknown

    EN24 and EN2 steels, a drop from 4000 s to 6 s for similar temperature rise was observed. Metadynamic ... carbon–manganese or silicon–manganese steels, but stops after a reduction at ... growth by strain-induced grain boundary migration;.

  1. Mechanics in Steels through Microscopy

    NARCIS (Netherlands)

    Tirumalasetty, G.K.

    2013-01-01

    The goal of the study consolidated in this thesis is to understand the mechanics in steels using microscopy. In particular, the mechanical response of Transformation Induced Plasticity (TRIP) steels is correlated with their microstructures. Chapter 1 introduces the current state of the art of TRIP

  2. A Tale of Wootz Steel

    Indian Academy of Sciences (India)

    manufacture of steel in south India by a crucible process at ... indicates that the production of wootz steel was almost on an industrial scale in ... in an Age of Design marked by ... The Russian Anasoff also studied the process of manufacturing.

  3. Irradiation creep in ferritic steels

    International Nuclear Information System (INIS)

    Vandermeulen, W.; Bremaecker, A. de; Burbure, S. de; Huet, J.J.; Asbroeck, P. van

    Pressurized and non-pressurized capsules of several ferritic steels have been irradiated in Rapsodie between 400 and 500 0 C up to 3.7 x 10 22 n/cm 2 (E>0.1 MeV). Results of the diameter measurements are presented and show that the total in-pile deformation is lower than for austenitic steels

  4. Steel structures for nuclear facilities

    International Nuclear Information System (INIS)

    1993-01-01

    In the guide the requirements concerning design and fabrication of steel structures for nuclear facilities and documents to be submitted to the Finnish Centre for Radiation and Nuclear Safety (STUK) are presented. Furthermore, regulations concerning inspection of steel structures during construction of nuclear facilities and during their operation are set forth

  5. Steels from materials science to structural engineering

    CERN Document Server

    Sha, Wei

    2013-01-01

    Steels and computer-based modelling are fast growing fields in materials science as well as structural engineering, demonstrated by the large amount of recent literature. Steels: From Materials Science to Structural Engineering combines steels research and model development, including the application of modelling techniques in steels.  The latest research includes structural engineering modelling, and novel, prototype alloy steels such as heat-resistant steel, nitride-strengthened ferritic/martensitic steel and low nickel maraging steel.  Researchers studying steels will find the topics vital to their work.  Materials experts will be able to learn about steels used in structural engineering as well as modelling and apply this increasingly important technique in their steel materials research and development. 

  6. Nanoprecipitation in bearing steels

    International Nuclear Information System (INIS)

    Barrow, A.T.W.; Rivera-Diaz-del-Castillo, P.E.J.

    2011-01-01

    θ-phase is the main hardening species in bearing steels and appears in both martensitically and bainitically hardened microstructures. This work presents a survey of the microstrucural features accompanying nanoprecipitation in bearing steels. Nanoprecipitate structures formed in 1C-1.5Cr wt.% with additions of Cr, Mn, Mo, Si and Ni are studied. The work is combined with thermodynamic calculations and neural networks to predict the expected matrix composition, and whether this will transform martensitically or bainitically. Martensite tetragonality, composition and the amount of retained austenite are related to hardness and the type of nanoprecipitate structures in martensitic grades. The θ-phase volume fraction, the duration of the bainite to austenite transformation and the amount of retained austenite are related to hardness and a detailed quantitative description of the precipitate nanostructures. Such description includes compositional studies using energy-dispersive spectroscopy, which shows that nanoprecipitate formation takes place under paraequilibrium. Special attention is devoted to a novel two-step bainite tempering process which shows maximum hardness; we prove that this is the most effective process for incorporating solute into the precipitates, which are finer than those resulting from one-step banitic transformation processes.

  7. X-ray protective clothing. Does DIN 6857-1 allow an objective comparison between lead-free and lead-composite materials?

    International Nuclear Information System (INIS)

    Eder, H.; Schlattl, H.; Hoeschen, C.

    2010-01-01

    Purpose: The validity of DIN 6857-1 to establish lead equivalence for protective clothing is evaluated by Monte Carlo simulations and measurements. Materials and Methods: Commercially available protective clothing made of lead, lead-free and lead-composite materials has been tested regarding its protective efficacy. The analysis has been performed on the one hand in accordance with the test conditions described in the manufacturing standard DIN EN 61331-3 and on the other hand following the new DIN 6857-1 standard. Additionally, measurements have been carried out under simulated patient conditions by using an Alderson-Rando phantom. Results: Following DIN EN 61331-3, the lead-free protective clothing achieved the required protective efficacy only at a restricted tube-voltage range. The test according to DIN 6857-1 showed that the protective criteria were fulfilled only by one lead-composite apron, but not by the three lead-free aprons examined. Thus, in order to guarantee the same protection as lead between 50 and 120 kV, the conditions of DIN 6857-1 must be fulfilled. Conclusion: A modification of DIN EN 61331-3 to account for secondary radiation is strongly advised in the case of lead-free materials. In summary, most of the protective lead-free aprons in use should be used with care, particularly for examinations with a high dose. (orig.)

  8. Physical metallurgy of laser surface melted plastic mould steels: a case study

    Directory of Open Access Journals (Sweden)

    Colaço, R.

    1998-04-01

    Full Text Available The purpose of this paper is to illustrate the potential of laser surface melting to improve the surface characteristics of plastic mould steels, using a typical plastic mould steel (DIN X43Cr12 as a case study. After laser surface melting the microstructure of this steel is formed by fine dendrites of austenite partially transformed into martensite. Although the equilibrium solidification phase is 8- ferrite, the formation of primary austenite is kinetically favored and this phase tends to predominate at the high solidification speeds used in laser processing. It was observed that the volume fraction of retained austenite depends critically on the laser processing parameters, so that the microstructure can change from almost completely martensitic to almost completely austenitic by changing the laser processing parameters. Laser melted tool steels show remarkable secondary hardening after tempering at suitable temperatures. In DIN X42Cr13 the secondary hardening peak temperature after LSM (600°C is 100°C higher than after conventional heat treatment (500°C, due to the presence of large amounts of retained austenite. It was observed that this phase only destabilizes above 600°C, due to the precipitation of M7C3 and stress relieving. After destabilization, retained austenite transforms into martensite during cooling. Secondary hardening is due to the transformation of retained austenite into martensite and to the precipitation of M7C3 and M23C6 carbides.

    El objetivo del presente trabajo es ilustrar el potencial de la fusión superficial mediante láser para la mejora de las características estructurales de los moldes de acero para plásticos, centrándolo en el caso concreto del acero DIN X42Cr13. Tras el tratamiento de fusión superficial mediante láser, la microestructura del material está formada por dendritas finas de austenita parcialmente transformadas en

  9. The influence of He on the high temperature fracture of an austenitic stainless steel

    International Nuclear Information System (INIS)

    Saguees, A.A.

    1976-01-01

    The Ti-stabilised DIN 1.4970 austenitic stainless steel is an important candidate for high temperature - high neutron fluence applications which will create appreciable amounts of He within the matrix. In order to determine the mechanical effects associated with the presence of He alone a set of tensile specimens was cyclotron implanted to uniform He concentrations in the 10 -6 to 10 -4 at. range and later creep tested at 700 0 C and 800 0 C. The elongation to fracture values of the implanted specimens were reduced with respect to those of unimplanted controls. Scanning Electron Microscope (SEM) examination revealed that fracture starts as intergranular and subsequently propagates in a transgranular fashion, the intergranular part being much more extended in the implanted material. Transmission Electron Microscope (TEM) examination revealed He segregation at the grain boundary precipitates. A mechanism of He embrittlement is discussed in terms of the present results

  10. Thin-Sheet zinc-coated and carbon steels laser welding

    International Nuclear Information System (INIS)

    Pecas, P.; Gouveia, H.; Quintino, L.

    1998-01-01

    This paper describes the results of a research on CO 2 laser welding of thin-sheet carbon steels (Zinc-coated and uncoated), at several thicknesses combinations. Laser welding has an high potential to be applied on sub-assemblies welding before forming to the automotive industry-tailored blanks. The welding process is studied through the analysis of parameters optimization, metallurgical quality and induced distortions by the welding process. The clamping system and the gas protection system developed are fully described. These systems allow the minimization of common thin-sheet laser welding defects like misalignment, and zinc-coated laser welding defects like porous and zinc ventilation. The laser welding quality is accessed by DIN 8563 standard, and by tensile, microhardness and corrosion test. (Author) 8 refs

  11. Connections: Superplasticity, Damascus Steels, Laminated Steels, and Carbon Dating

    Science.gov (United States)

    Wadsworth, Jeffrey

    2016-12-01

    In this paper, a description is given of the connections that evolved from the initial development of a family of superplastic plain carbon steels that came to be known as Ultra-High Carbon Steels (UHCS). It was observed that their very high carbon contents were similar, if not identical, to those of Damascus steels. There followed a series of attempts to rediscover how the famous patterns found on Damascus steels blades were formed. At the same time, in order to improve the toughness at room temperature of the newly-developed UHCS, laminated composites were made of alternating layers of UHCS and mild steel (and subsequently other steels and other metals). This led to a study of ancient laminated composites, the motives for their manufacture, and the plausibility of some of the claims relating to the number of layers in the final blades. One apparently ancient laminated composite, recovered in 1837 from the great pyramid of Giza which was constructed in about 2750 B.C., stimulated a carbon dating study of ancient steels. The modern interest in "Bladesmithing" has connections back to many of these ancient weapons.

  12. Mycobacterium tuberculosis DinG is a structure-specific helicase that unwinds G4 DNA: implications for targeting G4 DNA as a novel therapeutic approach.

    Science.gov (United States)

    Thakur, Roshan Singh; Desingu, Ambika; Basavaraju, Shivakumar; Subramanya, Shreelakshmi; Rao, Desirazu N; Nagaraju, Ganesh

    2014-09-05

    The significance of G-quadruplexes and the helicases that resolve G4 structures in prokaryotes is poorly understood. The Mycobacterium tuberculosis genome is GC-rich and contains >10,000 sequences that have the potential to form G4 structures. In Escherichia coli, RecQ helicase unwinds G4 structures. However, RecQ is absent in M. tuberculosis, and the helicase that participates in G4 resolution in M. tuberculosis is obscure. Here, we show that M. tuberculosis DinG (MtDinG) exhibits high affinity for ssDNA and ssDNA translocation with a 5' → 3' polarity. Interestingly, MtDinG unwinds overhangs, flap structures, and forked duplexes but fails to unwind linear duplex DNA. Our data with DNase I footprinting provide mechanistic insights and suggest that MtDinG is a 5' → 3' polarity helicase. Notably, in contrast to E. coli DinG, MtDinG catalyzes unwinding of replication fork and Holliday junction structures. Strikingly, we find that MtDinG resolves intermolecular G4 structures. These data suggest that MtDinG is a multifunctional structure-specific helicase that unwinds model structures of DNA replication, repair, and recombination as well as G4 structures. We finally demonstrate that promoter sequences of M. tuberculosis PE_PGRS2, mce1R, and moeB1 genes contain G4 structures, implying that G4 structures may regulate gene expression in M. tuberculosis. We discuss these data and implicate targeting G4 structures and DinG helicase in M. tuberculosis could be a novel therapeutic strategy for culminating the infection with this pathogen. © 2014 by The American Society for Biochemistry and Molecular Biology, Inc.

  13. Dinámica y crecimiento de los granos de polvo en la nebulosa protoplanetaria

    Science.gov (United States)

    de La Fuente Marcos, Carlos

    2001-06-01

    En el escenario estándar de la formación planetaria, los planetesimales (cuerpos de tamaño kilométrico) crecen a partir de granos de polvo, similares a los interestelares, embebidos en un disco gaseoso denominado nebulosa protoplanetaria. Durante esta etapa, los movimientos del gas pueden tener gran influencia en la dinámica y el crecimiento de los granos de polvo, dado que el flujo kepleriano del gas frena el movimiento de los mismos haciendo que caigan hacia el Sol, y la turbulencia inhibe la inestabilidad gravitacional de la capa de polvo. Aunque se acepta que los planetesimales fueron los elementos constituyentes de los planetas, todavía se desconoce cómo se produjo la formación de los mismos. Por esta razón, en los estudios más recientes, existe un renovado interés por comprender mejor la evolución de la capa de polvo inmersa en el disco gaseoso de la Nebulosa. El gas que fluye en el disco puede engendrar estructuras carentes de simetría axial, como por ejemplo ondas espirales y vórtices, a partir de gran variedad de mecanismos de excitación e inestabilidad. En 1995, Barge y Sommeria pusieron de manifiesto que la existencia de vórtices gaseosos persistentes en la nebulosa solar tendría importantes consecuencias sobre la formación de los planetesimales y el posterior crecimiento de los planetas gigantes. La investigación desarrollada en esta Tesis analiza la relación entre el polvo y el gas debida al acoplamiento por fricción dinámica entre ambos; en concreto, se estudia el efecto del flujo medio del gas sobre la dinámica de las partículas de polvo. El primer objetivo es investigar en profundidad los procesos de captura y crecimiento de los granos de polvo dentro de un vórtice y su posible relevancia en cuanto a la formación de los planetesimales. El segundo objetivo es la exploración de los efectos de ondas espirales propagándose en el disco gaseoso sobre la dinámica y el crecimiento de las partículas. La presencia de líneas de

  14. Dinâmica molecular ab initio:aplicações ao estudo de propriedades electrónicas de sistemas moleculares

    OpenAIRE

    Martiniano, Hugo Filipe de Mesquita Costa, 1978-

    2013-01-01

    Tese de doutoramento, Química (Química-Física), Universidade de Lisboa, Faculdade de Ciências, 2013 O método da dinâmica molecular ab initio exibe vantagens significativas para o estudo da estrutura e propriedades electrónicas de sistemas moleculares complexos. No entanto, uma das suas desvantagens é o elevado custo computacional, quando comparado com os métodos de dinâmica molecular clássicos. Um dos modos de resolver este problema é adoptar uma abordagem sequencial, na qual a dinâmica é ...

  15. Modelagem de uma unidade de produção para caprinos leiteiros utilizando a dinâmica de sistemas

    OpenAIRE

    Guimarães, Vinicius Pereira

    2007-01-01

    O trabalho foi desenvolvido buscando abordar as características de dinâmica, complexidade e inter- relacionamento de um sistema de produção de caprinos. Buscou-se, através da metodologia de modelagem e simulação Dinâmica de Sistemas, identificar o impacto na dinâmica e rentabilidade econômica de rebanhos caprinos leiteiros provocados por modificações no manejo reprodutivo, mortalidade, qualidade do alimento e na idade para o início da vida reprodutiva em cabritas. Buscou-se também avaliar a u...

  16. Dinâmicas de grupo orientadas pelas atividades de estudo: desenvolvimento de habilidades e competências na educação profissional

    OpenAIRE

    Alberti,Taís Fim; Abegg,Ilse; Costa,Márcia Rejane Julio; Titton,Mauro

    2014-01-01

    Explicita resultados de pesquisa sobre dinâmicas de grupo e sua contribuição para aquisição de conhecimentos teórico-práticos. Realizamos ações em uma escola pública federal, envolvendo estudantes do terceiro semestre do Curso Técnico em Administração de Empresas. Para coleta de dados, planejamos, implementamos e avaliamos sequência didática centrada em dinâmicas de grupos tematizadas pelos conteúdos curriculares. Utilizaram-se questionários abertos para avaliar se as dinâmicas de grupo poder...

  17. Occupational Profiles in the European Steel Industry.

    Science.gov (United States)

    Franz, Hans-Werner; And Others

    The steel industry in Europe has faced great changes, with resulting layoffs and restructuring. Now that the most basic changes seem to be over, it has become evident that the remaining steel industry requires more highly trained workers than was the case previously. Although steel maintenance employees were always highly skilled, steel production…

  18. Methods of making bainitic steel materials

    Science.gov (United States)

    Bakas, Michael Paul; Chu, Henry Shiu-Hung; Zagula, Thomas Andrew; Langhorst, Benjamin Robert

    2018-01-16

    Methods of making bainitic steels may involve austenitizing a quantity of steel by exposing the quantity of steel to a first temperature. A composition of the quantity of steel may be configured to impede formation of non-bainite ferrite, pearlite, and Widmanstatten ferrite. The quantity of steel may be heat-treated to form bainite by exposing the quantity of steel to a second, lower temperature. The second, lower temperature may be stabilized by exposing the quantity of steel to the second, lower temperature in the presence of a thermal ballast.

  19. Stahlschüssel key to steel

    CERN Document Server

    Wegst, W S

    2016-01-01

    The Key to Steel (Stahlschlüssel/Stahlschluessel) cross reference book will help you to decode / decipher steel designations and find equivalent materials worldwide. The 2016 edition includes more than 70,000 standard designations and trade names from approximately 300 steelmakers and suppliers. Presentation is trilingual: English, French, and German. Materials covered include structural steels, tool steels, valve steels, high temperature steels and alloys, stainless and heat-resisting steels, and more. Standards and designations from 25 countries are cross-referenced.

  20. Advanced steel reheat furnace

    Energy Technology Data Exchange (ETDEWEB)

    Moyeda, D.; Sheldon, M.; Koppang, R. [Energy and Environmental Research Corp., Irvine, CA (United States); Lanyi, M.; Li, X.; Eleazer, B. [Air Products and Chemicals, Inc., Allentown, PA (United States)

    1997-10-01

    Energy and Environmental Research Corp. (EER) under a contract from the Department of Energy is pursuing the development and demonstration of an Advanced Steel Reheating Furnace. This paper reports the results of Phase 1, Research, which has evaluated an advanced furnace concept incorporating two proven and commercialized technologies previously applied to other high temperature combustion applications: EER`s gas reburn technology (GR) for post combustion NOx control; and Air Product`s oxy-fuel enrichment air (OEA) for improved flame heat transfer in the heating zones of the furnace. The combined technologies feature greater production throughput with associated furnace efficiency improvements; lowered NOx emissions; and better control over the furnace atmosphere, whether oxidizing or reducing, leading to better control over surface finish.

  1. Stainless steel decontamination manipulators

    International Nuclear Information System (INIS)

    Sullivan, R.J.

    1986-01-01

    Three, large-volume coverage manipulator systems were designed and built for the Defense Water Processing Facility at the Savannah River Laboratory. These stainless steel systems will be used for high-pressure spray decontamination of waste containers and large process equipment modules. Each system has a manipulator arm, folding boom, and vertical drive and guide structure. Handling capacity is 45 kg, horizontal reach is 4.6 m with a 180-deg swing motion, and the vertical travel is 6 m. The system is remotely removable and replaceable in modules using an overhead crane and an impact wrench. The manipulator arm has seven motions: Shoulder rotation and pivot, elbow pivot, wrist pivot and rotation, and grip open-close. All motions are variable speed and are slip-clutch protected to prevent overloading from external forces (collisions)

  2. Steel containment buckling

    International Nuclear Information System (INIS)

    Butler, T.A.; Baker, W.E.

    1987-01-01

    Two aspects of buckling of a free-standing nuclear containment building were investigated in a combined experimental and analytical program. In the first part of the study, the response of a scale model of a containment building to dynamic base excitation is investigated. A simple harmonic signal was used for preliminary studies followed by experiments with scaled earthquake signals as the excitation source. The experiments and accompanying analyses indicate that the scale model response to earthquake-type excitations is very complex and that current analytical methods may require that a dynamic capacity reduction factor be incorporated. The second part of the study quantified the effects of framing at large penetrations on the static buckling capacity of scale model containments. Results show little effect from the framing for the scale models constructed from the polycarbonate, Lexan. However, additional studies with a model constructed of the prototypic steel material are recommended. (orig.)

  3. Cold-formed steel design

    CERN Document Server

    Yu, Wei-Wen

    2010-01-01

    The definitive text in the field, thoroughly updated and expanded Hailed by professionals around the world as the definitive text on the subject, Cold-Formed Steel Design is an indispensable resource for all who design for and work with cold-formed steel. No other book provides such exhaustive coverage of both the theory and practice of cold-formed steel construction. Updated and expanded to reflect all the important developments that have occurred in the field over the past decade, this Fourth Edition of the classic text provides you with more of the detailed, up-to-the-minute techni

  4. Micropurity in stainless steel making

    International Nuclear Information System (INIS)

    Motloch, Z.

    1981-01-01

    New technologies were developed by the Vitkovice research institutes in response to high requirements for the quality of high-alloy steels for nuclear power, viz., duplex technology with double vacuum degassing at the DH unit and oxidation vacuum degassing using the VAKUVIT equipment. The steel produced shows low contents of impurities and high micropurity. A study was conducted into changes in carbon content and the formation of titanium nitrides and carbonitrides in austenitic steels during their production, and optimum technological parameters were found for eliminating their formation in forgings. (author)

  5. Steel fiber replacement of mild steel in prestressed concrete beams

    Science.gov (United States)

    2010-10-01

    In traditional prestressed concrete beams, longitudinal prestressed tendons serve to resist bending moment and : transverse mild steel bars (or stirrups) are used to carry shear forces. However, traditional prestressed concrete I-beams : exhibit earl...

  6. Steel fiber replacement of mild steel in prestressed concrete beams.

    Science.gov (United States)

    2011-01-01

    In traditional prestressed concrete beams, longitudinal prestressed tendons serve to resist bending moment and transverse mild : steel bars (or stirrups) are used to carry shear forces. However, traditional prestressed concrete I-beams exhibit early-...

  7. [The Steel factor].

    Science.gov (United States)

    Cáceres-Cortés, J R

    1997-01-01

    Mice bearing mutations at either of two loci, dominant White spotting(W) or Steel(Sl), exhibit development defects in hematopoietic, melanocytic and germ cells. Genetics studies have shown that the SI locus encodes the Steel factor (SF), which is the ligand for the tyrosine kinase receptor c-kit, the product of the W locus. SF is synthesized in membrane-bound form and can be processed to produce a soluble form. Cell-cell interaction is important in the production of normal blood cells in vivo and in vitro and in the cellular expansion of leukemic cells. We discuss here how SF decreases the requirements in cell interaction for blast colony formation in acute myeloblastic leukemia (AML) and the presence of membrane-bound SF possibly contributes to the density-dependent growth of the AML blasts. We explain that SF is mainly a survival factor for hematopoietic cells, of little proliferative effect, which maintains CD34+ hematopoietic cells in an undifferentiated state. These properties would potentially allow the maintenance of hematopoietic cells in culture for the purpose of marrow purging or gene therapy. The activation of the c-kit signal transduction pathway may play a significant role in the development of many types of non-hematological malignancies by disrupting normal cell-cell interactions and allowing the growth of cancer cell populations. In summary, the properties of the SF indicate it has a role for survival signals during the process of normal differentiation, AML proliferation and in the maintenance of many c-kit+ tumors.

  8. 2169 steel waveform experiments.

    Energy Technology Data Exchange (ETDEWEB)

    Furnish, Michael David; Alexander, C. Scott; Reinhart, William Dodd; Brown, Justin L.

    2012-11-01

    In support of LLNL efforts to develop multiscale models of a variety of materials, we have performed a set of eight gas gun impact experiments on 2169 steel (21% Cr, 6% Ni, 9% Mn, balance predominantly Fe). These experiments provided carefully controlled shock, reshock and release velocimetry data, with initial shock stresses ranging from 10 to 50 GPa (particle velocities from 0.25 to 1.05 km/s). Both windowed and free-surface measurements were included in this experiment set to increase the utility of the data set, as were samples ranging in thickness from 1 to 5 mm. Target physical phenomena included the elastic/plastic transition (Hugoniot elastic limit), the Hugoniot, any phase transition phenomena, and the release path (windowed and free-surface). The Hugoniot was found to be nearly linear, with no indications of the Fe phase transition. Releases were non-hysteretic, and relatively consistent between 3- and 5-mmthick samples (the 3 mm samples giving slightly lower wavespeeds on release). Reshock tests with explosively welded impactors produced clean results; those with glue bonds showed transient releases prior to the arrival of the reshock, reducing their usefulness for deriving strength information. The free-surface samples, which were steps on a single piece of steel, showed lower wavespeeds for thin (1 mm) samples than for thicker (2 or 4 mm) samples. A configuration used for the last three shots allows release information to be determined from these free surface samples. The sample strength appears to increase with stress from ~1 GPa to ~ 3 GPa over this range, consistent with other recent work but about 40% above the Steinberg model.

  9. Dinâmicas no uso e cobertura da terra: perspectivas e desafios da Demografia

    Directory of Open Access Journals (Sweden)

    Julia Corrêa Côrtes

    2014-06-01

    Full Text Available Pensando de forma integrada a relação população-ambiente, o artigo aborda os estudos sobre dinâmica populacional e mudança no uso e cobertura da terra, com foco na contribuição e nos desafios da Demografia. Aproximando-se do tema em meados dos anos 1990, a Demografia teve como principal contribuição destacar a importância dos componentes populacionais nos modelos, antes, colocados como secundários e sob uma perspectiva simples. Demógrafos brasileiros dedicados a questões ambientais, embora tivessem prioritariamente a temática urbana no seu escopo, colaboraram de maneira indireta para a desenvoltura do campo, ao proporem uma releitura sobre relações população-ambiente. O artigo parte do caso da Amazônia brasileira, mostrando como a população foi explorada nas teorias sobre mudanças nos usos e coberturas da terra, passando pelo viés do crescimento populacional durante o período de fronteira agrícola, o modelo de ciclo de vida do domicílio (fecundidade e composição do domicílio na década de 1990 e, mais recentemente, o enfoque no componente migratório. Para a Demografia, aponta-se como essencial o aprofundamento nos elementos demográficos que não o volume e a inclusão do espaço e seus efeitos. Para a construção da Ciência da Mudança da Terra, destacam-se a incorporação de dinâmicas urbanas nas investigações, a adoção de uma metodologia multiescalar e o exercício do diálogo entre as diversas disciplinas, incorporando mais sistematicamente a contribuição da Demografia.

  10. Steel pipelines standards for fittings and joint accessories

    CERN Document Server

    DIN

    2013-01-01

    Die 1. Auflage von DIN Handbook 15/6 erweitert die DIN Handbook-Reihe um den Themenbereich Fittings für verschiedene Montagetechniken. Es enthält in englischer Übersetzung die wesentlichen Normen über Lötfittings aus Kupfer, Temperguss-Fittings, Fittings aus Stahl und Kunststofffittings. Abgerundet wird der Inhalt durch ergänzende Normen, Begriffe und Grundnormen. Reihe DIN_Handbook - 15/6

  11. Standardization work by ASTM and DIN concerning test methods for metallic materials - comparative assessment with regard for practice

    International Nuclear Information System (INIS)

    Gerischer, K.

    1986-01-01

    The article explains the significant role of ASTM and marks out basic elements of the specification system of ASTM standards. Usefulness in practice is taken as the main criterion for the subsequent comparison of ASTM or DIN activities and procedures, and results, for standardization in the field of test methods for metallic materials. The main differences are shown to exist with regard to tropicality of test standards, presentation of useful information and background knowledge, and importance attached to formal questions. ASTM standardization work is shown to be more up-to-date, contain more information, and to be less concerned with formal matters. A closer cooperation between ASTM and DIN is strongly recommended. (orig.) [de

  12. Pañoletas y polainas. Dinámicas de la moda en la Cuba soviética

    OpenAIRE

    Cabrera Arús, Maria Antonia

    2015-01-01

    Resumen: El texto explora el rol de las dinámicas de la moda en la consolidación del socialismo de estado de tipo soviético en Cuba. Se afirma que la moda participó de dinámicas de dominación, legitimación y control en los años 1960s y 1970s. Se sostiene que el régimen cubano promovió significados denotativos de la cultura material que conectaron de manera directa valores políticos y estilos de la moda, y se ofrecen ejemplos que acercan el estudio de este país a los estudios contemporáneos de...

  13. La nueva dinámica de acumulación resumen capitalista y los problemas sociales y regionales

    Directory of Open Access Journals (Sweden)

    Benjamín Afanador Vargas

    2004-07-01

    Full Text Available El objetivo del presente trabajo es mostrar los cambios en las estrategias productivas y competitivasa que se ven enfrentadas las firmas en un mercado cada vez más integrado y competitivo en elámbito internacional. En este contexto el capital, como expresión universal de poder y dominaciónpolítica y económica, establece dinámicas entre Estados, regiones y grupos de individuos. Estascomplejas relaciones en que unos y otros actores se mueven, jugando las estrategias impuestaspor el gran capital, va develando roles y actores ganadores y perdedores en que las opcionesmenos favorables las tienen las empresas y las regiones que tienen mayores dificultades parainterpretar las nuevas reglas del juego o tienen menores condiciones y habilidades, naturales oadquiridas, para entrar en la dinámica del mercado global.

  14. Insuficiencia dinámica, crecimiento y desempleo en México, 1974-2012

    OpenAIRE

    Vargas, Blanca L. Avendaño; Hernández, Ignacio Perrotini

    2015-01-01

    El artículo presenta una reformulación de la hipótesis de insuficiencia dinámica de Prebisch (1970), analiza la teoría dinámica de Harrod (1939), la ley Kaldor-Verdoorn (Kaldor, 1966; 1967) y la teoría del crecimiento endógeno de Thirlwall (1969; 2000)Thirlwall and León-Ledesma, 2000. A posteriori estudiamos los determinantes del crecimiento económico y del desempleo en México durante el periodo 1974-2012. Con base en el análisis empírico, sostenemos que una baja tasa de acumulación genera una...

  15. PAM values and coral physiological measures in response to DIN treatments from 2015-07-01 to 2016-01-30 (NCEI Accession 0145017)

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — The scope of the proposed work includes a six-month laboratory dose response experiment to determine the effects of environmentally-realistic levels of DIN on coral...

  16. Interacciones entre plantas y microorganismos del suelo: Consecuencias para la dinámica de comunidades vegetales

    OpenAIRE

    Lozano Bernal, Yudi M.

    2014-01-01

    En esta tesis doctoral pretendemos aclarar aspectos fundamentales relacionados con la interacción entre plantas y microorganismos del suelo y sus consecuencias para la dinámica de las comunidades vegetales. Pretendemos comprobar si las comunidades microbianas están determinando interacciones negativas y/o positivas entre plantas; si tras el abandono de tierras dedicadas al cultivo, las plantas y los microorganismos del suelo siguen patrones sucesionales, y si los microorganismo...

  17. Introduction to the new version of the standard DIN 6814, part 3 'dose magnitudes and dose units'

    Energy Technology Data Exchange (ETDEWEB)

    Harder, D

    1985-02-01

    The recent draft of the DIN standard on dose quantities and dose units is presented on original version and explained by the chairman of the Working Comittee Dosimetry. There are important modifications by the introduction of SI units, the new definitions of site dose and individual dose characteristic dose rate and dose rate constant, as well as by corrections of the notions ''secondary electron equilibrium'' and ''free in air''.

  18. The use of the DInSAR method in the monitoring of road damage caused by mining activities

    Science.gov (United States)

    Murdzek, Radosław; Malik, Hubert; Leśniak, Andrzej

    2018-04-01

    This paper reviews existing remote sensing methods of road damage detection and demonstrates the possibility of using DInSAR (Differential Interferometry SAR) method to identify endangered road sections. In this study two radar images collected by Sentinel-1 satellite have been used. Images were acquired with 24 days interval in 2015. The analysis allowed to estimate the scale of the post-mining deformation that occurred in Upper Silesia and to indicate areas where road infrastructure is particularly vulnerable to damage.

  19. Dinámica de inventarios y dinero bajo competencia monopolística y salarios de eficiencia

    OpenAIRE

    Escudé, Guillermo

    1988-01-01

    En este trabajo construyo un modelo IS-LM dinámico basado en la idea de que las empresas mantienen inventarios de productos terminados que actúan como un "colchón" absorbente de posibles desequilibrios en el mercado de productos. (Párrafo extraído del texto a modo de resumen) Instituto de Investigaciones Económicas

  20. Austenitic stainless steel weld inspection

    International Nuclear Information System (INIS)

    Mech, S.J.; Emmons, J.S.; Michaels, T.E.

    1978-01-01

    Analytical techniques applied to ultrasonic waveforms obtained from inspection of austenitic stainless steel welds are described. Experimental results obtained from a variety of geometric and defect reflectors are presented. Specifically, frequency analyses parameters, such as simple moments of the power spectrum, cross-correlation techniques, and adaptive learning network analysis, all represent improvements over conventional time domain analysis of ultrasonic waveforms. Results for each of these methods are presented, and the overall inspection difficulties of austenitic stainless steel welds are discussed

  1. High-strength maraging steels

    International Nuclear Information System (INIS)

    Grachev, S.V.; Shejn, A.S.

    1989-01-01

    Analysis of data on technological and operation properties of maraging steels on Fe-Cr-Ni, Fe-Ni, Fe-Cr-Co-Mo bases is given. Their advantages and drawbacks are pointed out. The scheme of strengthening heat treatment is considered. The fields of the most effective application of maraging steels for instance, for products operating under conditions of low-cycle and shock cyclic loading are mentioned

  2. Steel refining possibilities in LF

    Science.gov (United States)

    Dumitru, M. G.; Ioana, A.; Constantin, N.; Ciobanu, F.; Pollifroni, M.

    2018-01-01

    This article presents the main possibilities for steel refining in Ladle Furnace (LF). These, are presented: steelmaking stages, steel refining through argon bottom stirring, online control of the bottom stirring, bottom stirring diagram during LF treatment of a heat, porous plug influence over the argon stirring, bottom stirring porous plug, analysis of porous plugs disposal on ladle bottom surface, bottom stirring simulation with ANSYS, bottom stirring simulation with Autodesk CFD.

  3. Dinámica contextual de la educción de requisitos software

    Directory of Open Access Journals (Sweden)

    Dante Carrizo

    2013-01-01

    Full Text Available La educción de requisitos software desde los stakeholders ha sido declarada como una actividad clave que influye poderosamente sobre la calidad de los requisitos especificados y, por lo tanto, del producto final del desarrollo. Por esta razón, es incuestionable la necesidad de contar con guías claras para conducir la interacción con los propietarios de la información del dominio y de las necesidades a las que se pretende dar solución. Este trabajo se centra en la modelación de la educción considerando la influencia de los agentes contextuales del proceso tales como: eductor, quien conduce la actividad; informante, quien posee la información relevante; dominio del problema, características de la problemática a atacar; y proceso, características y restricciones de la actividad misma. El artículo analiza la dinámica que relaciona y condiciona estos factores para seleccionar la técnica a aplicar en cada sesión de educción. Finalmente, el trabajo contribuye con un modelo temporal del proceso y con la representación de la casuística principal del proceso de educción.

  4. Mujeres jefas de hogar y su dinámica familiar

    Directory of Open Access Journals (Sweden)

    Brígida García

    2005-01-01

    Full Text Available Nuestro interés particular en este trabajo es complementar la discusión más frecuente sobre las condiciones materiales de vida que caracterizan a los hogares con jefas mujeres, con un análisis de dimensiones menos conocidas de su vida familiar, tales como la división del trabajo doméstico y del cuidado de los hijos, la participación de los diferentes miembros en la toma de decisiones y la presencia o ausencia de violencia, haciendo siempre hincapié en la diferenciación social que caracteriza a estas unidades. La fuente de información es la Encuesta sobre Dinámica Familiar (Dinaf para las áreas metropolitanas de México y Monterrey. Las mujeres jefas de hogar son estudiadas en comparación con las esposas y las otras mujeres residentes, utilizando análisis de clasificación múltiple.

  5. Para cada universo colecionista, suas fontes: dinâmicas informacionais nas tramas de Clifford Janeway

    Directory of Open Access Journals (Sweden)

    Kelly Castelo Branco da Silva Melo

    2017-09-01

    Full Text Available O artigo parte do pressuposto que a literatura policial, como modo de registro e expressão de experiências ficcionais, ela mesma também considerada, nos estudos das áreas de Biblioteconomia e Ciência da Informação, uma fonte de informação, constitui-se de uma abordagem que torna possível a análise/interpretação e representação de quadros de referências sócio-históricas e, mais especificamente, de determinadas práticas colecionistas. Como desdobramento de estudos sobre bibliofilia em Memória Social, o artigo toma como campo empírico cinco romances policiais escritos pelo norte-americano John Dunning. Por meio da leitura analítica desses livros, propõe teórica e metodologicamente identificar, recortar e descrever as fontes de informação julgadas relevantes para as dinâmicas das tramas, visando elucidar o que é possível depreender do universo bibliófilo, e o que, nesse universo ficcional, constitui e representa práticas informacionais utilizadas por/em um universo colecionista não ficcional.

  6. A partilha do trabalho e a demanda dinâmica por trabalhadores e horas

    Directory of Open Access Journals (Sweden)

    Rodrigo Pereira

    2001-03-01

    Full Text Available Este artigo investiga se uma redução na jornada de trabalho padrão tem um impacto positivo sobre o nível de emprego, um efeito conhecido na literatura como partilha do trabalho (work-sharing. A inovação do artigo consiste na inclusão de custos de ajustamento do emprego no modelo teórico, o que introduz interessantes aspectos dinâmicos que permitem estudar as trajetórias ótimas do emprego e das horas médias no curto e longo prazos. A principal conclusão é que a partilha do trabalho não ocorre, mesmo considerando os custos de ajustamento do emprego.This paper investigates whether a reduction in standard hours has a positive impact on the employment level, an effect known in the literature as work-sharing. The innovation here is to include employment adjustment costs in the theoretical model. This feature introduces interesting dynamic aspects, which make it possible to study optimal paths of employment and average hours both in the short and the long run. The main result is that work-sharing does not occur even in the presence of employment adjustment costs.

  7. Estudio del movimiento de estructuras dinámicas mediante el uso de GPS.

    Directory of Open Access Journals (Sweden)

    Juan G. Serpas

    2016-03-01

    Full Text Available En la escuela de Topografía, Catastro y Geodesia de la Universidad Nacional, se realizó una investigación sobre el uso del sistema de posicionamiento global por satélite (GPS para la determinación del movimiento dinámico sobre estructuras civiles. Estas estructuras son diseñadas de forma que tengan un cierto grado de elasticidad, lo que permite un permanente movimiento, evitando así la fractura de la estructura misma. La actividad de investigación tuvo como fin el desarrollo y análisis de procedimientos y metodologías para determinar es una forma eficiente, económica y sencilla el movimiento de las estructuras, tanto en períodos cortos como largos. En el estudio se aplicaron técnicas espectrales para el análisis de los datos brindados por receptores GPS colocados sobre el puente del río Tempisque, Costa Rica. El objetivo de dicho análisis es la determinación de la magnitud del movimiento sufrido por ese puente en periodos cortos y largos.

  8. Modelo de dinámica lateral de vehículo mediante bond graph

    Directory of Open Access Journals (Sweden)

    Juan Carlos Parra Márquez

    2008-07-01

    Full Text Available Este trabajo presenta los resultados de la investigación, cuyo objetivo es obtener un modelo matemático que permita determinar la dinámica lateral de un vehículo mediante el uso de Bond Graph. Este modelo es válido para robótica móvil. Los análisis de comportamiento del modelo han sido probados con simulaciones típicas del movimiento lateral de un vehículo. Finalmente, este modelo ha sido obtenido e implementado mediante el software 20-Sim. This paper presents the results of a research whose objective was to find a mathematical model in order to determine the lateral dynamic of Vehicle by means of the use of Bond Graph. This model is valid also for mobile robotics. The analyses of behavior of the model were realized across typical simulations of a vehicle in lateral movement. Finally, this mathematical model was obtained and implemented across the software 20-Sim.

  9. [Certification of an RIA laboratory according to DIN EN ISO 9001-2000].

    Science.gov (United States)

    Moser, E; Markowetz, D; Schächtele, S

    2002-06-01

    The university hospital Freiburg intends to establish step by step a total quality management system (TQMS) in all facilities with an external certification as its final aim. This has been reached already in the central laboratory. Therefore, it is effective for the department of nuclear medicine to do the same for its own lab specialized in thyroid hormones. The TQMS has been built up within six months on the basis of DIN EN ISO 9001:2000. This internationally accepted standard is of uttermost economical importance for an institution situated near the French and Swiss border. This review describes the procedure in detail. Responsible for the effort were the engagement of the coworkers in the lab as well as an adequate choice of the external adviser and the authority for certification. The procedure is formalized to a high degree and much understanding for analytic thinking and systematization is needed. Now it remains to be seen, if the desired effect (increased understanding for quality within the department, more efficient performance of the lab, better acceptance by the clients) will arise.

  10. [Quality assessment according to DIN EN ISO 9001:2000: certification in a university ENT department].

    Science.gov (United States)

    Helbig, M; Kahla-Witzsch, H A; Helbig, S; Knecht, R; Gstöttner, W

    2006-12-01

    In 2003, our department inaugurated a quality management system. The certification according to DIN EN ISO 9001:2000 as required by the hospital management was achieved in August 2005. The aims were optimization of internal operating schedules and standardization of procedures according to logistic interfaces with external structures. Since 2000, the implementation of an internal quality management system is required by German law and threatened by penalty in case of non-implementation. Beside a basic audit and optimization of all organizational procedures, all core processes were determined and the approvals checked. These aims involve both the quality of operational procedures, in and outpatient treatment, research, study and teaching and aspects of service such as quickness of scheduling and forwarding of reports as well as economic aspects and efficiency. The department of "quality management", whose main tasks are the professional guidance and the training of the quality management representatives, plays an important role. Realization of the new regulations and restructuring resulted in an increase in effectiveness and an improvement in operational procedures. In particular, patients and staff have benefited from the reorganized and modified sequence of operations. Implementation of a quality management system in different hospital departments is recommended.

  11. Dinámica de fluidos computacional aplicada al estudio de regeneradores térmicos

    Directory of Open Access Journals (Sweden)

    Cesar Nieto Lodoño

    2004-01-01

    Full Text Available En el presente artículo, muestra los resultados logrados durante la simulación de un regenerador térmico de lecho poroso empacado, sometido a convección forzada transitoria y su respectiva verificación experimental. Para visualizar la aplicación de la Dinámica de Fluidos Computacional (en inglés Computational Fluid Dynamics, CFD en regeneradores de calor, se realiza un estudio detallado de los elementos que conforman la malla; analizando su distribución, tamaño y respectivo efecto sobre la precisión de los resultados. Se establecen las simplificaciones y alcances de los modelos empleados. Se comprueba la veracidad de los resultados obtenidos, mediante la validación experimental de estos en un modelo físico idéntico al empleado durante la simulación. Estas etapas permitieron observar que el comportamiento exponencial de la temperatura en los elementos empacados durante el periodo de calentamiento, fue idéntico al observado por Mejía [8]. Los resultados obtenidos aquí, verifican la capacidad de la CFD para el estudio de los regeneradores térmicos.

  12. Dinámica de una metrópoli periférica en Brasil

    Directory of Open Access Journals (Sweden)

    Inaiá Maria Moreira de Carvalho

    2010-01-01

    Full Text Available En este artículo se analiza la evolución reciente de la segregación socioespacial y la de la conformación urbana en la ciudad de Salvador, a la luz del debate sobre las transformaciones de las metrópolis dentro del capital globalizado. Si bien se reconoce que todas las grandes ciudades terminan siendo alcanzadas por la globalización, en el texto se resalta, sin embargo, que los efectos de ese proceso no son uniformes ni convergen en un modelo único de ciudad. Es necesario considerar la conformación histórica de cada una de ellas, sus instituciones, actores y decisiones políticas locales dentro de una dinámica definida por la continuidad/transformación, donde lo que ya existía condiciona la irrupción de lo nuevo, que en muchos casos ya había comenzado a delinearse en el pasado. Mediante la demostración de la conformación de una metrópoli extremadamente desigual y segregada y la medida en que las transformaciones han agravado tales alteraciones al paso de los últimos años, esta revisión del caso de Salvador se propone exponer algunas reflexiones para entender mejor los efectos del proceso de globalización sobre las grandes ciudades de América Latina.

  13. MICROALLOYED STEELS FOR THE AUTOMOTIVE INDUSTRY

    Directory of Open Access Journals (Sweden)

    Debanshu Bhattacharya

    2014-12-01

    Full Text Available Two major drivers for the use of newer steels in the automotive industry are fuel efficiency and increased safety performance. Fuel efficiency is mainly a function of weight of steel parts, which in turn, is controlled by gauge and design. Safety is determined by the energy absorbing capacity of the steel used to make the part. All of these factors are incentives for the U.S. automakers to use both Highly Formable and Advanced High Strength Steels (AHSS to replace the conventional steels used to manufacture automotive parts in the past. AHSS is a general term used to describe various families of steels. The most common AHSS is the dual-phase steel that consists of a ferrite-martensite microstructure. These steels are characterized by high strength, good ductility, low tensile to yield strength ratio and high bake hardenability. Another class of AHSS is the complex-phase or multi-phase steel which has a complex microstructure consisting of various phase constituents and a high yield to tensile strength ratio. Transformation Induced Plasticity (TRIP steels is another class of AHSS steels finding interest among the U.S. automakers. These steels consist of a ferrite-bainite microstructure with significant amount of retained austenite phase and show the highest combination of strength and elongation, so far, among the AHSS in use. High level of energy absorbing capacity combined with a sustained level of high n value up to the limit of uniform elongation as well as high bake hardenability make these steels particularly attractive for safety critical parts and parts needing complex forming. A relatively new class of AHSS is the Quenching and Partitioning (Q&P steels. These steels seem to offer higher ductility than the dual-phase steels of similar strengths or similar ductility as the TRIP steels at higher strengths. Finally, martensitic steels with very high strengths are also in use for certain parts. The most recent initiative in the area of AHSS

  14. Estimación de modelos econométricos dinámicos lineales en tiempo continuo con observaciones discretas y medidas con error

    OpenAIRE

    Nuño Sevilla, Luis Enrique

    2004-01-01

    El problema considerado en esta tesis es la estimación de los parámetros de modelos econométricos dinámicos lineales gaussianos formulados en tiempo continuo cuando las observaciones son discretas y se recogen a intervalos irregulares de tiempo. Además, se permite la posibilidad de que las observaciones difieran de las variables cuya dinámica se representa en el modelo.

  15. Medidas dinámicas de predictibilidad en el índice s&p 500 y sus determinantes

    Directory of Open Access Journals (Sweden)

    Javier Humberto Ospina Holguín

    2015-04-01

    Full Text Available El objeto de este estudio es medir la predictibilidad del índice accionario estadounidense S&P 500 y establecer posibles determinantes de esta predictibilidad. La predictibilidad se ha estudiado ampliamente, pero en pocos casos mediante medidas dinámicas y per se, como se hace aquí. Para establecer la predictibilidad se utilizan la medida eta del campo de las redes neuronales, el valor p del test de la razón de varianzas del campo de la econometría financiera y el análisis de fluctuación sin tendencia del campo de la econofísica. Se construye un algoritmo de inversión basado en las medidas dinámicas de predictibilidad que es mejor que la estrategia de comprar y mantenerse en el periodo estudiado. Para la medida más promisoria, se establece una relación empírica entre la predictibilidad y varios factores económicos y financieros. El panorama que arroja este estudio es el de un mercado que no es estáticamente predecible, sino cuya predictibilidad evoluciona dinámicamente en el tiempo, lo cual es compatible con la hipótesis del mercado adaptativo.

  16. Ground deformation monitoring using RADARSAT-2 DInSAR-MSBAS at the Aquistore CO2 storage site in Saskatchewan (Canada)

    Science.gov (United States)

    Czarnogorska, M.; Samsonov, S.; White, D.

    2014-11-01

    The research objectives of the Aquistore CO2 storage project are to design, adapt, and test non-seismic monitoring methods for measurement, and verification of CO2 storage, and to integrate data to determine subsurface fluid distributions, pressure changes and associated surface deformation. Aquistore site is located near Estevan in Southern Saskatchewan on the South flank of the Souris River and west of the Boundary Dam Power Station and the historical part of Estevan coal mine in southeastern Saskatchewan, Canada. Several monitoring techniques were employed in the study area including advanced satellite Differential Interferometric Synthetic Aperture Radar (DInSAR) technique, GPS, tiltmeters and piezometers. The targeted CO2 injection zones are within the Winnipeg and Deadwood formations located at > 3000 m depth. An array of monitoring techniques was employed in the study area including advanced satellite Differential Interferometric Synthetic Aperture Radar (DInSAR) with established corner reflectors, GPS, tiltmeters and piezometers stations. We used airborne LIDAR data for topographic phase estimation, and DInSAR product geocoding. Ground deformation maps have been calculated using Multidimensional Small Baseline Subset (MSBAS) methodology from 134 RADARSAT-2 images, from five different beams, acquired during 20120612-20140706. We computed and interpreted nine time series for selected places. MSBAS results indicate slow ground deformation up to 1 cm/year not related to CO2 injection but caused by various natural and anthropogenic causes.

  17. Electrochemical studies of the corrosion behavior of a low-carbon steel in aqueous chloride solutions simulating accident conditions of radioactive waste disposal

    International Nuclear Information System (INIS)

    Farvaque-Bera, A.M.; Leistikow, S.

    1991-01-01

    The fine-grained structural steel DIN W.Nr. 1.0566 was exposed to various sulfate and chloride-containing aqueous solutions, the latter ones simulating the potential accidental environment of water intrusion into a salt mine. By electrochemical measurements in salt brines, the following results were achieved: (1) The corrosion rate is highly dependent on salt brine composition, pH and temperature. (2) Active metal dissolution led to formation of shallow pits as surface corrosion phenomenon. Thus, the application of electrochemical techniques - under non-polarized as well as under potentiodynamic conditions - proved to be suitable for fast qualitative testing of the influence of various environmental parameters on steel corrosion. (orig.)

  18. Un modelo de sistema dinámico híbrido utilizando el enfoque de la lógica difusa

    Directory of Open Access Journals (Sweden)

    Germán García Benítez

    2010-01-01

    Full Text Available Se presenta un modelo de sistema dinámico híbrido utilizando la lógica difusa. Para lograr esto se hace una breve descripción de los principales enfoques que se tienen en la actualidad de los sistemas dinámicos híbridos desarrollando las ecuaciones básicas de los bloques que conforman el modelo. Actualmente la teoría del control se ha centrado en el estudio por separado de la dinámica continua y la dinámica discreta; sin embargo, es necesario introducir el estudio de la combinación de ambos en un solo tratado. En el ámbito industrial los procesos son dinámicos y toda su estructura de control está basada en la teoría de la lógica digital. Sin embargo existe el paradigma de la lógica difusa, la cual se introduce en este artículo para proponer un nuevo enfoque. Cabe mencionar que para validar el modelo se utilizan herramientas computacionales de simulación de sistemas dinámicos.

  19. Properties of hot rolled steels for enamelling

    International Nuclear Information System (INIS)

    Gavrilovski, Dragica; Gavrilovski, Milorad

    2003-01-01

    The results of an investigation of the structure and properties of experimental produced hot rolled steels suitable for enamelling are presented in the paper. Hot rolled steels for enamelling represent a special group of the steels for conventional enamelling. Their quality has to be adapted to the method and conditions of enamelling. Therefore, these steels should meet some specific requirements. In addition to usual investigation of the chemical composition and mechanical properties, microstructure and quality of the steel surface also were investigated. The basic aim was to examine steels capability for enamelling, i. e. steels resistance to the fish scales phenomena, by trial enamelling, as well as quality of the steel - enamel contact surface, to evaluate the binding. Also, the changes of the mechanical properties, especially the yield point, during thermal treatment, as a very specific requirement, were investigated, by simplified method. Good results were obtained confirming the steels capability for enamelling. (Original)

  20. ALERGENUL ARA H3, GLOBULINA DE REZERVĂ 11S DIN SEMINŢELE DE ARAHIDE 1. PROTEOLIZA LIMITATĂ CU PAPAINĂ

    Directory of Open Access Journals (Sweden)

    Ala CHERDIVARĂ

    2017-07-01

    Full Text Available Proteoliza globulinei de rezervă 11S din seminţele de arahide, Ara h3, cu papaină începe cu cuscindarea secvenței C-terminale extinse a α-catenelor, care cuprinde regiunea α-helixurilor. Clivarea ulterioară a buclei dintre β-strendurile E' şi F' din partea centrală a β-barrelui din α-catene duce la formarea fragmentelor, legate cu β-catenele intacte prin legătură disulfidică, precum şi reţinute în molecula globulinei 11S parţial hidrolizată prin interacţiuni necovalente. Conform scenariului proteolizei descrise, acţiunea iniţială a papainei distruge regiunea C-terminală a α-catenelor, în care sunt prezenţi trei din cei patru determinanţi antigenici (epitopii IgE, identificaţi în globulina 11S din arahide. Astfel, gradul de alergenicitate a Ara h3 poate fi substanțial redus prin proteoliza sa limitată cu papaină.ALLERGEN ARA H3, STORAGE 11S GLOBULIN FROM PEANUT SEEDS 1. PAPAIN LIMITED PROTEOLYSISPapain proteolysis of the storage 11S globulin Ara h3 from peanut seeds starts from the detachment of an extended a-chain C-terminal sequence covering the region of a-helices. Further cleavage of a loop between b-strands E’ and F’ inside the central part of a-chain b-barrel occurs generating fragments connected with intact b-chains via a disulfide bond and those retained inside the molecule of partially hydrolyzed 11S globulin due to non-covalent interactions. In accordance with the described proteolysis scenario, the C-terminal a-chain region containing three of the four antigen determinants (IgE epitopes identified in the peanut 11S globulin is destroyed during the initial papain action. Therefore, the level of Ara h3 allergenicity can be decreased via papain limited proteolysis.

  1. High temperature oxidation behavior of ODS steels

    Science.gov (United States)

    Kaito, T.; Narita, T.; Ukai, S.; Matsuda, Y.

    2004-08-01

    Oxide dispersion strengthened (ODS) steels are being developing for application as advanced fast reactor cladding and fusion blanket materials, in order to allow increased operation temperature. Oxidation testing of ODS steel was conducted under a controlled dry air atmosphere to evaluate the high temperature oxidation behavior. This showed that 9Cr-ODS martensitic steels and 12Cr-ODS ferritic steels have superior high temperature oxidation resistance compared to 11 mass% Cr PNC-FMS and 17 mass% Cr ferritic stainless steel. This high temperature resistance is attributed to earlier formation of the protective α-Cr 2O 3 on the outer surface of ODS steels.

  2. Review on Cold-Formed Steel Connections

    Science.gov (United States)

    Tan, Cher Siang; Mohammad, Shahrin; Md Tahir, Mahmood; Shek, Poi Ngian

    2014-01-01

    The concept of cold-formed light steel framing construction has been widespread after understanding its structural characteristics with massive research works over the years. Connection serves as one of the important elements for light steel framing in order to achieve its structural stability. Compared to hot-rolled steel sections, cold-formed steel connections perform dissimilarity due to the thin-walled behaviour. This paper aims to review current researches on cold-formed steel connections, particularly for screw connections, storage rack connections, welded connections, and bolted connections. The performance of these connections in the design of cold-formed steel structures is discussed. PMID:24688448

  3. Population Dynamics Modeling of Arapaima gigas Modelagem da dinâmica populacional de Arapaima gigas

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    Eliane dos Santos de Souza Coutinho

    2010-01-01

    Full Text Available Pirarucu (Arapaima gigas has been of the most important natural fishing resources of the Amazon region. Due to its economic importance, and the necessity to preserve the species hand, field research concerning the habits and behavior of the pirarucu has been increasing for the last 20 years. The aim of this paper is to present a mathematical model for the pirarucu population dynamics considering the species peculiarities, particularly the male parental care over the offspring. The solution of the dynamical systems indicates three possible equilibrium points for the population. The first corresponds to extinction; the third corresponds to a stable population close to the environmental carrying capacity. The second corresponds to an unstable equilibrium located between extinction and full use of the carrying capacity. It is shown that lack of males’ parental care closes the gap between the point corresponding to the unstable equilibrium and the point of stable non-trivial equilibrium. If guarding failure reaches a critical point the two points coincide and the population tends irreversibly to extinction. If some event tends to destabilize the population equilibrium, as for instance inadequate parental care, the model responds in such a way as to restore the trajectory towards the stable equilibrium point avoiding the route to extinction. The parameters introduced to solve the system of equations are partially derived from limited but reliable field data collected at the Mamirauá Sustainable Development Reserve (MSDR in the Brazilian Amazonian Region.Pirarucu (Arapaima gigas tem sido um dos mais importantes recursos pesqueiros naturais da Amazônia. Devido à sua importância econômica, por um lado, e a necessidade de preservar a espécie, por outro lado, o domínio da investigação relativa a hábitos e comportamento do pirarucu tem sido crescente nos últimos 20 anos. O objetivo deste trabalho é apresentar um modelo matemático para a din

  4. Modelo de dinâmica de sistemas para o processo de S&OP ampliado

    Directory of Open Access Journals (Sweden)

    Jean Carlos Domingos

    2015-01-01

    Full Text Available ResumoApesar de o processo de S&OP (Sales and Operations Planning não ser uma prática nova nas empresas, principalmente naquelas de grande porte, ainda é tema de estudos nas suas práticas e ferramentas computacionais de apoio. Modelos e ferramentas computacionais focadas para o auxílio no processo de S&OP são utilizadas e podem contribuir para a melhoria da qualidade da sua execução e dos seus resultados. As ferramentas mais comuns são aquelas baseadas em planilhas eletrônicas, e as mais sofisticadas, em técnicas de pesquisa operacional inseridas em sistemas APS (Advanced Planning Systems. A partir da revisão bibliográfica realizada sobre teoria e técnicas computacionais usadas para o auxílio do processo de S&OP, foi identificada a ausência de estudos relacionados ao uso de Dinâmica de Sistemas (System Dynamics. Adicionalmente, a revisão aponta a necessidade de estudos relacionados à integração de análise econômica e financeira durante a elaboração dos planos agregados e o uso de variáveis probabilísticas no processo que possibilitem a análise estatística no sentido de fornecer planos mais confiáveis. Outra questão relevante observada é que os gestores que participam do processo de S&OP nem sempre têm uma visão global de todas as variáveis e restrições envolvidas neste processo, assim observa-se também que as técnicas e ferramentas utilizadas para execução do processo de S&OP não oferecem uma visão holística das atividades e variáveis envolvidas. Com isso, neste trabalho, é proposto um modelo de Simulação de Dinâmica de Sistemas que proporcione uma visão holística para o processo de S&OP e que permita a integração com os processos da área financeira e o uso de variáveis probabilísticas. A avaliação dos resultados das simulações realizadas com o modelo, apoiada por um projeto de experimentos (DoE, mostra que os planos gerados são compatíveis se comparados com a prática empresarial

  5. ARMONIZAREA MANAGEMENTULUI ACHIZIŢIILOR PUBLICE DIN REPUBLICA MOLDOVA LA DIRECTIVELE UE

    Directory of Open Access Journals (Sweden)

    Maria COJOCARU

    2016-12-01

    Full Text Available În acest articol sunt abordate probleme ce vizează reforma sistemului de achiziţii publice al Republicii Moldova şi al României, armonizarea legislaţiei şi a procesului de achiziţii publice la normele europene. Întru realizarea scopului şi sarcinilor propuse au fost aplicate diferite metode de cercetare: monografică, comparativă, metoda grafică. Cercetarea procesului de achiziţii publice, în contextul prevederilor legislative ale Uniunii Europene, a permis autorilor să constate prezenţa unor nereguli şi disfuncţionalităţi în organizarea şi desfăşurarea procedurilor de achiziţii publice la nivel naţional. În concluzie, au fost formulate sugestii menite să contribuie la perfecţionarea managementului achiziţiilor publice din Republica Moldova.HARMONIZATION OF PROCUREMENT MANAGEMENT IN MOLDOVA TO EU DIRECTIVESIn this article the author presents a studio on the reform of the procurement system of Moldova and Romania, har­monization of legislation and the process of European procurement rules. In achieving established goals were applied different research methods: monographic, comparative graphical method. Research the procurement process in the con­text of the legislative European Union (EU, allowed the author to declare the presence of irregularities and failures in organization and conduct of procurement procedures at national level. In conclusion, suggestions were made that would help to improve the management of public procurement in Moldova.

  6. Rashid al-din. Shu’ab-i Panjganah. 2. The Mongols and the Turks (2

    Directory of Open Access Journals (Sweden)

    Ch.I. Khamidova

    2016-12-01

    Full Text Available Research objectives and materials: The article presents part of the translation of the 2nd chapter of the manuscript. This part contains a genealogical tree of Jochi Khan (his descendants known to Rashid al-din. The footnotes present the Arabic writing of the names in the manuscript. The results of translation and analyses of the text of the manuscript could serve to various purposes: study of Rashid al-Din’s heritage, Golden Horde history, genealogical history of Jochi Khan and his descendants. The translation of the manuscript has never been published neither partly nor fully. Research results and novelty: The genealogy of Jochi Khan’s ancestors in “Shu’ab-i panjganah” mainly repeats the information from Jami ‘al-Tawarikh, although additional data is also available. The genealogy of the descendants of Jochi in “Shu’ab-i panjganah” contains fifteen of his sons. In fact, there are 10 genealogical lines, since five of them did not have any offspring, or they are not known (these are the lines of Berke, Kukadzhi, Dzhilaraun, Mohammed, Shinkum. Jochi’s genealogy contains some notes regarding the succession to the throne in the Golden Horde: the name of the ruler of the Golden Horde is written in red ink, also sometimes the author notes that one or the other descendant of Jochi took the throne, indicating the order of succession to the throne. These notes offer two variants of succession of rulers; a comparison of the text of “Shu’ab-i panjganah” with the text of Rashid al-din’s main historical writing “Jami ‘al-Tawarikh” does not clarify the situation as, for example, Kukadzhi who is presented in one variant of order of succession, is absent in “Jami ‘al-Tawarikh”.

  7. A Polarimetric First-Order Model of Soil Moisture Effects on the DInSAR Coherence

    Directory of Open Access Journals (Sweden)

    Simon Zwieback

    2015-06-01

    Full Text Available Changes in soil moisture between two radar acquisitions can impact the observed coherence in differential interferometry: both coherence magnitude |Υ| and phase Φ are affected. The influence on the latter potentially biases the estimation of deformations. These effects have been found to be variable in magnitude and sign, as well as dependent on polarization, as opposed to predictions by existing models. Such diversity can be explained when the soil is modelled as a half-space with spatially varying dielectric properties and a rough interface. The first-order perturbative solution achieves–upon calibration with airborne L band data–median correlations ρ at HH polarization of 0.77 for the phase Φ, of 0.50 for |Υ|, and for the phase triplets ≡ of 0.56. The predictions are sensitive to the choice of dielectric mixing model, in particular the absorptive properties; the differences between the mixing models are found to be partially compensatable by varying the relative importance of surface and volume scattering. However, for half of the agricultural fields the Hallikainen mixing model cannot reproduce the observed sensitivities of the phase to soil moisture. In addition, the first-order expansion does not predict any impact on the HV coherence, which is however empirically found to display similar sensitivities to soil moisture as the co-pol channels HH and VV. These results indicate that the first-order solution, while not able to reproduce all observed phenomena, can capture some of the more salient patterns of the effect of soil moisture changes on the HH and VV DInSAR signals. Hence it may prove useful in separating the deformations from the moisture signals, thus yielding improved displacement estimates or new ways for inferring soil moisture.

  8. Quality assessment according to DIN EN ISO 9001:2000. Certification in a nuclear medicine department

    International Nuclear Information System (INIS)

    Doebert, N.; Osterloh, M.; Menzel, C.; Gruenwald, F.; Kahla-Witzsch, H.A.

    2005-01-01

    In the year 2002 our department started to inaugurate a quality management system. The certification according to DIN EN ISO 9001:2000 as required by the hospital management was achieved in August 2004. The aim was the optimisation of internal operating schedules and the standardisation of procedures according to logistic interfaces with external structures. Since 2000 the implementation of an internal quality management system is required by German law (SGB V paragraph 135) and threatened by penalty in case of non-implementation (SGB V paragraph 137). Beside a basic audit and optimisation of all organisational procedures all core processes of our department were determined and the approvals were checked. These aims concern i.e. both the quality of our diagnostics of nuclear medicine and of the in vitro laboratory and the aspects of service such as quickness of scheduling and forwarding of reports and economic and efficient aspects of our work. An important role plays the department of ''quality management'', whose main tasks are the professional guidance and the training of the quality management representatives. The realisation of the new regulations and the restructuring resulted in an increase of effectiveness and in an improvement of operational procedures in our department. Especially the patients and the staff granted from the reorganised and modified sequence of operations. Implementation of a quality management system takes some efforts but the positive aspects for the structure and the flow of work are predominant so that the inauguration of a quality management system in the different departments of a hospital are recommendable. (orig.)

  9. Dinámica migratoria y desigualdades regionales en Argentina (1947-2010

    Directory of Open Access Journals (Sweden)

    Guillermo Velázquez

    2015-06-01

    Full Text Available RESUMEN Hacia fines del siglo XIX, la Argentina, como país agro-exportador, había conferido a su desarrollo económico un marcado carácter de desigualdad regional. Lejos de revertir esta situación, el proceso de industrialización, privilegió como forma de localización la proximidad de los mercados consumidores. El objetivo de este trabajo es indagar el comportamiento de las desigualdades provinciales y regionales durante las seis últimas décadas, privilegiando el papel de la dinámica migratoria en este proceso. Estas desigualdades no pueden comprenderse como una situación de "desequilibrio transitorio", como podría explicarse desde el marco de la economía neoclásica. Se trata más bien, de situaciones estructurales, que se mantienen en el tiempo, en donde se conserva la superioridad de unas regiones por sobre otras de manera interdependiente. Este proceso se lleva adelante de manera acumulativa en el tiempo, reforzando las desigualdades históricamente preexistentes. ABSTRACT Towards end of the 19th century, Argentina, such as agro-export country, had conferred a distinctly regional inequality to their economic development. Far from reversing this situation, the process of industrialization, he favored as a form of localization the proximity of markets consumers. The objective of this study is to investigate the behavior of provincial and regional inequalities over the past six decades, giving priority to the role of migration dynamics in this process. These inequalities cannot understand it as a situation of "transitional imbalance", as it could be explained within the framework of neoclassical economics. It is rather, structural situations, which are kept at the time, where the superiority of some regions is kept above other interdependent way. This process is carried forward cumulatively over time, reinforcing historically pre-existing inequalities.

  10. Low dose irradiation effects on DIN 1.4948 mechanical properties

    International Nuclear Information System (INIS)

    Schaaf, B. van der; Vries, M.I. de

    For the SNR 300 the licensing authorities require the determination of the lower boundaries of post-irradiation mechanical properties for DIN 1.4948 parent metal and welded joints. It has been established that with decreasing strain rate the post-irradiation tensile ductility decreases. A transition strain rate has been observed, above which there is no effect of irradiation on ductility. The transition strain rate increases with increasing temperature. Coarse grained heats show lower ultimate tensile strength above 800 K than fine grained heats. There is no significant effect of irradiation on load controlled high cycle fatigue with frequencies of 1 Hz or higher. In low cycle fatigue numbers of cycles to failure decrease with decreasing frequency. Increasing the test temperature reduces the number of cycles to failure even more. The frequency effect is more evident at 823 K. Parent metal has a better fatigue resistance than welded joints in unirradiated and irradiated condition. Creep strength is reduced by irradiation due to loss of ductility. It is shown that with increasing grain size the rupture strength decreases. The ductility of welded joints after irradiation is low, in some cases as low as 0.5% creep strain. After irradiation, tensile, creep and fatigue fracture surfaces show many more intergranular features than in the equivalent unirradiated condition. The promotion of intergranular fracture by irradiation and the consequent degradation of low strain rate mechanical properties is explained by the presence of helium on grain boundaries. Several measures to increase the helium content threshold can be taken, such as grain refinement, homogeneous boron distribution and promotion of helium bubble initiation. In cases where helium embrittlement is encountered, life reduction factors on unirradiated material properties must be applied

  11. Um olhar para a dinâmica do Coordenador de Grupos

    Directory of Open Access Journals (Sweden)

    Kátya Alexandrina Matos Barreto Mota

    2006-04-01

    Full Text Available No mundo contemporâneo a utilização de grupos enquanto estratégia na atenção em saúde e em atividades do ensino é cada vez mais utilizado, considerando inclusive as propostas oficiais do Ministério da Saúde e da Educação. Assim, o domínio dessa tecnologia pelos profissionais como fundamento para guiar suas ações assistenciais e gerenciais, torna-se, a cada dia de maior importância. Neste artigo de atualização propomos desenvolver alguns aspectos sobre os pressupostos teóricos e dilemas do coordenador de grupos, assim como apontar elementos que possam ajudar os profissionais que têm no grupo seu campo de trabalho. O texto aborda também a organização do setting grupal, o manejo das situações previsíveis, a administração do tempo, manejo de conflitos do grupo e o poder do contrato grupal. A essência do texto é ancorada no principal dilema do coordenador de grupo, que é encontrar a medida adequada, ou seja, equilíbrio para fazer intervenções sobre os conteúdos que emergem na dinâmica grupal, centradas no contexto científico e no emocional que surgem do contato com o grupo. Neste intervalo entre a prática e a teoria, entre o profissional e o pessoal é que acreditamos encontrar o equilíbrio. Nesse sentido, é fundamental ao coordenador a noção da complexidade grupal, para que diante de sua singularidade possa viver o grupo e tudo o que dele emana.

  12. Dinâmica Socio-Cultural da Cidade: A Conflitualidade dos Imigrantes Africanos em Lisboa

    Directory of Open Access Journals (Sweden)

    Anelino Francisco Silva

    2010-01-01

    Full Text Available O artigo analisa sobre a dinâmica sociocultural, o direito dos imigrantes à cidade, caso da Área Metropolitana de Lisboade Lisboa, traz uma reflexão do atual processo de inserção ou não dos imigrantes africanos de Angola, Cabo-Verde, São Tomé e Guine-Bissau, como um fator de conflito gerado pela sua permanência na cidade. A globalização atua no global-local, ajuizando a cidade reforçar as características local baseada da legitimidade cultural e política. A cidade metrópole precisa estar preparada às novas exigências produtivas do sistema econômico e da reprodução social. Sendo Lisboa, no contexto dos processos de estruturação econômico-territorial e de diferenciação sócio-urbanística, o espaço polarizado pela capital do país e, ter sido a metrópole que teve sob seu domínio Angola, Cabo -Verde, São Tomé e Guine – Bissau, que com o fim da colonização inicia um processo migratório para Portugal, especialmente, Lisboa. A baixa inserção ao mercado de trabalho, a tênue socialização cultural e a negação ao direito à cidade passam a ser obstáculos em toda sua plenitude

  13. Identificarea izolatului bacterian P5 obţinut din plante de măr

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    MAGHER Maria

    2016-06-01

    Full Text Available The phytopathogen Erwinia amylovora (Burrill Winslow et al. is a bacterium having a major impact on pome fruit species causing identification problems at some development phenophases of trees. The aim of this paper was to identify the bacterial isolate P5 obtained from apple tree samples using classical and modern methods recommended for the bacterium E. amylovora (API 20E test, gas chromatography, PCR, DASELISA and indirect immunofluorescence. As a result of our investigations, the bacterium Erwinia amylovora was clearly identified. Taking into consideration the quarantine status of the phytopathogen E. amylovora, it is necessary to carry out the phytosanitary test sin order to monitor the presence of fire blight on pome fruit species as well as to implement timely the required preventive and curative control measures. Rezumat. Fitopatogenul Erwinia amylovora (Burrill Winslow et al. este o bacterie cu un impact deosebit asupra speciilor pomicole sămânţoase, care prezintă probleme de identificare la anumite fenofaze de dezvoltare a pomilor. Scopul acestei lucrări a fost de a identifica izolatul bacterian P5, obţinut din probe de măr, prin metode clasice şi contemporane recomandate pentru bacteria E. amylovora (testul API 20E, gaz-cromatografie, PCR, DAS-ELISA, imunofluorescenţă indirectă. În rezultatul cercetărilor a fost identificată bacteria Erwinia amylovora. Având în vedere statutul de carantină al fitopatogenului E. amylovora, se impune necesitatea efectuării obligatorii a sondajelor fitosanitare pentru monitorizarea prezenţei focului bacterian la culturile pomicole sămânţoase şi efectuarea la timp a măsurilor preventive şi curative de combatere.

  14. Principal component analysis of MSBAS DInSAR time series from Campi Flegrei, Italy

    Science.gov (United States)

    Tiampo, Kristy F.; González, Pablo J.; Samsonov, Sergey; Fernández, Jose; Camacho, Antonio

    2017-09-01

    Because of its proximity to the city of Naples and with a population of nearly 1 million people within its caldera, Campi Flegrei is one of the highest risk volcanic areas in the world. Since the last major eruption in 1538, the caldera has undergone frequent episodes of ground subsidence and uplift accompanied by seismic activity that has been interpreted as the result of a stationary, deeper source below the caldera that feeds shallower eruptions. However, the location and depth of the deeper source is not well-characterized and its relationship to current activity is poorly understood. Recently, a significant increase in the uplift rate has occurred, resulting in almost 13 cm of uplift by 2013 (De Martino et al., 2014; Samsonov et al., 2014b; Di Vito et al., 2016). Here we apply a principal component decomposition to high resolution time series from the region produced by the advanced Multidimensional SBAS DInSAR technique in order to better delineate both the deeper source and the recent shallow activity. We analyzed both a period of substantial subsidence (1993-1999) and a second of significant uplift (2007-2013) and inverted the associated vertical surface displacement for the most likely source models. Results suggest that the underlying dynamics of the caldera changed in the late 1990s, from one in which the primary signal arises from a shallow deflating source above a deeper, expanding source to one dominated by a shallow inflating source. In general, the shallow source lies between 2700 and 3400 m below the caldera while the deeper source lies at 7600 m or more in depth. The combination of principal component analysis with high resolution MSBAS time series data allows for these new insights and confirms the applicability of both to areas at risk from dynamic natural hazards.

  15. Notch aspects of RSP steel microstructure

    Directory of Open Access Journals (Sweden)

    Michal Černý

    2012-01-01

    Full Text Available For a rather long time, basic research projects have been focused on examinations of mechanical properties for Rapid Solidification Powder (RSP steels. These state-of-art steels are commonly known as “powdered steels“. In fact, they combine distinctive attributes of conventional steel alloys with unusual resistance of construction material manufactured by so called “pseudo-powdered” metallurgy.Choice of suitable materials for experimental verification was carried out based on characteristic application of so called “modern steel”. First, groups of stainless and tool steel types (steel grades ČSN 17 and 19 were selected. These provided representative specimens for the actual comparison experiment. For stainless steel type, two steel types were chosen: hardenable X47Cr14 (ČSN 17 029 stainless steel and non-hardenable X2CrNiMo18-14-3 (ČSN 17 350 steel. They are suitable e.g. for surgical tools and replacements (respectively. For tooling materials, C80U (ČSN 19 152 carbon steel and American D2 highly-alloyed steel (ČSN “equivalent” being 19 572 steel were chosen for the project. Finally, the M390 Böhler steel was chosen as representative of powdered (atomized steels. The goal of this paper is to discuss structural aspects of modern stainless and tool steel types and to compare them against the steel made by the RSP method. Based on the paper's results, impact of powdered steel structural characteristics on the resistance to crack initiation shall be evaluated.

  16. Anodized Steel Electrodes for Supercapacitors.

    Science.gov (United States)

    Sagu, Jagdeep S; Wijayantha, K G Upul; Bohm, Mallika; Bohm, Siva; Kumar Rout, Tapan

    2016-03-09

    Steel was anodized in 10 M NaOH to enhance its surface texture and internal surface area for application as an electrode in supercapacitors. A mechanism was proposed for the anodization process. Field-emission gun scanning electron microscopy (FEGSEM) studies of anodized steel revealed that it contains a highly porous sponge like structure ideal for supercapacitor electrodes. X-ray photoelectron spectroscopy (XPS) measurements showed that the surface of the anodized steel was Fe2O3, whereas X-ray diffraction (XRD) measurements indicated that the bulk remained as metallic Fe. The supercapacitor performance of the anodized steel was tested in 1 M NaOH and a capacitance of 18 mF cm(-2) was obtained. Cyclic voltammetry measurements showed that there was a large psueudocapacitive contribution which was due to oxidation of Fe to Fe(OH)2 and then further oxidation to FeOOH, and the respective reduction of these species back to metallic Fe. These redox processes were found to be remarkably reversible as the electrode showed no loss in capacitance after 10000 cycles. The results demonstrate that anodization of steel is a suitable method to produce high-surface-area electrodes for supercapacitors with excellent cycling lifetime.

  17. Corrosion of steel in concrete

    International Nuclear Information System (INIS)

    Preece, C.M.

    1982-10-01

    A comparative study has been made of those properties of Massiv and Standard cements which are considered to determine their ability to protect steel reinforcement from corroding. Saturated Massiv cement has a higher evaporabel water content, but a significantly finer pore structure than has saturated Standard cement. This fine structure resulted in an electrical resistivity ten times higher and chloride diffusivity ten times lower than those of Standard cement. Electrochemical measurements have shown that the passive current density of steel in Massiv mortar is higher than that of steel in Standard mortar, but the higher current should lead to a more rapid decrease in potential to a level at which neither chloride attack of hydrogen evolution will occur. Whereas steel in Standard mortar was found to be highly susceptible to crevice corrosion, no such attack has been observed in Massiv mortar. Moreover, the initiation of chloride induced corrosion and the subsequent rates of corrosion were both lower in Massiv mortar than in Standard mortar. Thus, it may be predicted that Massiv cement would provide greater protection for steel reinforcement in underground structures exposed to chloride containing ground water than would Standard cement. (author)

  18. Austenitic chromium nickel steel as standard reference material in measurement of thermal and temperature conductivity

    International Nuclear Information System (INIS)

    Binkele, L.

    1990-01-01

    A niobium-stabilized CrNi steel with the NBS designation SRM 735 is introduced as WLF standard reference material in a report by Hust and Giarratano, for the temperature range 300-1200 K and for thermal conductivities around 20 W/mk. However, its specification does not show it to be a direct member of the DIN family of CrNi steels. This report should be regarded as a continuation and supplement to the above-mentioned efforts in America. On the one hand, a solution of a possibly too-narrow specification is aimed at for the reference material, where it is important how sensitive the thermal conductivity is to changes in the chemical composition and changes of the manufacturing parameters and what accuracy can be reached for the reference values with the best measurement techniques. On the other hand, the data base should be expanded and the accuracy of the reference curve should be improved if possible. (orig./MM) [de

  19. Effects of mechanical-thermal treatments on the creep behaviour of a niobium stabilized stainless steel

    International Nuclear Information System (INIS)

    Rossi, J.L.

    1987-01-01

    The influence of microstructural variables controlled by mechanical-thermal treatments on the creep behavior of DIN-Werkstoff Nr. 1,4981 stainless steel a material candidate for use as cladding of fast breeder reactor fuel elements, was studied. The effect of the solution treatment, predeformation, predeformation plus aging and cycles of predeformation-aging, on the creep results obtained at 990 K, for applied stresses in the range 70 MPa - 310 MPa, are analysed. The results show: this material presents a creep strength superior to that show by AISI 316 stainless steel; a transition on the creep behavior is observed at a certain stress; the mechanical-thermal treatments were seen to be ineffective on the improvement of the creep strength; the pre-deformation and pre-deformation plus aging treatments were seen to induce material embrittlement whereas the cyclic treatments induced increased ductility. Transmission electron microscopy, X ray diffraction of extracted precipitates, and microanalysis were use to characterize the microstructure of this material. (author)

  20. DNA Polymerases ImuC and DinB Are Involved in DNA Alkylation Damage Tolerance in Pseudomonas aeruginosa and Pseudomonas putida.

    Science.gov (United States)

    Jatsenko, Tatjana; Sidorenko, Julia; Saumaa, Signe; Kivisaar, Maia

    2017-01-01

    Translesion DNA synthesis (TLS), facilitated by low-fidelity polymerases, is an important DNA damage tolerance mechanism. Here, we investigated the role and biological function of TLS polymerase ImuC (former DnaE2), generally present in bacteria lacking DNA polymerase V, and TLS polymerase DinB in response to DNA alkylation damage in Pseudomonas aeruginosa and P. putida. We found that TLS DNA polymerases ImuC and DinB ensured a protective role against N- and O-methylation induced by N-methyl-N'-nitro-N-nitrosoguanidine (MNNG) in both P. aeruginosa and P. putida. DinB also appeared to be important for the survival of P. aeruginosa and rapidly growing P. putida cells in the presence of methyl methanesulfonate (MMS). The role of ImuC in protection against MMS-induced damage was uncovered under DinB-deficient conditions. Apart from this, both ImuC and DinB were critical for the survival of bacteria with impaired base excision repair (BER) functions upon alkylation damage, lacking DNA glycosylases AlkA and/or Tag. Here, the increased sensitivity of imuCdinB double deficient strains in comparison to single mutants suggested that the specificity of alkylated DNA lesion bypass of DinB and ImuC might also be different. Moreover, our results demonstrated that mutagenesis induced by MMS in pseudomonads was largely ImuC-dependent. Unexpectedly, we discovered that the growth temperature of bacteria affected the efficiency of DinB and ImuC in ensuring cell survival upon alkylation damage. Taken together, the results of our study disclosed the involvement of ImuC in DNA alkylation damage tolerance, especially at low temperatures, and its possible contribution to the adaptation of pseudomonads upon DNA alkylation damage via increased mutagenesis.

  1. Ductility of high chromium stainless steels

    International Nuclear Information System (INIS)

    Peretyat'ko, V.N.; Kazantsev, A.A.

    1997-01-01

    Aimed to optimize the hot working conditions for high chromium stainless steels the experiments were carried in the temperature range of 800-1300 deg C using hot torsion tests and cylindrical specimens of ferritic and ferritic-martensitic steels 08Kh13, 12Kh13, 20Kh13, 30Kh13 and 40Kh13. Testing results showed that steel plasticity varies in a wide range depending on carbon content. Steels of lesser carbon concentration (08Kh13 and 12Kh13) exhibit a sharp increase in plasticity with a temperature rise, especially in the interval of 1200-1250 deg C. Steels 20Kh13 and 30Kh13 display insignificant plasticity increasing, whereas plastic properties of steel 40Kh13 increase noticeably in the range of 1000-1300 deg C. It is shown that optimal hot working conditions for specific steel must be selected with account of steel phase composition at high temperatures

  2. Financial Management: Emergency Steel Loan Guarantee Program

    National Research Council Canada - National Science Library

    2001-01-01

    In a February 1, 2001 letter, you expressed concerns about repayments of federally guaranteed loans by borrowers under the Emergency Steel Loan Guarantee Program and the effect of the program on the U.S. steel industry...

  3. Evaluation of the Effect of Different Plasma-Nitriding Parameters on the Properties of Low-Alloy Steel

    Science.gov (United States)

    Zdravecká, Eva; Slota, Ján; Solfronk, Pavel; Kolnerová, Michaela

    2017-07-01

    This work is concerned with the surface treatment (ion nitriding) of different plasma-nitriding parameters on the characteristics of DIN 1.8519 low-alloy steel. The samples were nitrided from 500 to 570 °C for 5-40 h using a constant 25% N2-75% H2 gaseous mixture. Lower temperature (500-520 °C) favors the formation of compound layers of γ' and ɛ iron nitrides in the surface layers, whereas a monophase γ'-Fe4 N layer can be obtained at a higher temperature. The hardness of this layer can be obtained when nitriding is performed at a higher temperature, and the hardness decreases when the temperature increases to 570 °C. These results indicate that pulsed plasma nitriding is highly efficient at 550 °C and can form thick and hard nitrided layers with satisfactory mechanical properties. The results show the optimized nitriding process at 540 °C for 20 h. This process can be an interesting means of enhancing the surface hardness of tool steels to forge dies compared to stamped steels with zinc coating with a reduced coefficient of friction and improving the anti-sticking properties of the tool surface.

  4. Optimum design of steel structures

    CERN Document Server

    Farkas, József

    2013-01-01

    This book helps designers and manufacturers to select and develop the most suitable and competitive steel structures, which are safe, fit for production and economic. An optimum design system is used to find the best characteristics of structural models, which guarantee the fulfilment of design and fabrication requirements and minimize the cost function. Realistic numerical models are used as main components of industrial steel structures. Chapter 1 containts some experiences with the optimum design of steel structures Chapter 2 treats some newer mathematical optimization methods. Chapter 3 gives formulae for fabrication times and costs. Chapters 4 deals with beams and columns. Summarizes the Eurocode rules for design. Chapter 5 deals with the design of tubular trusses. Chapter 6 gives the design of frame structures and fire-resistant design rules for a frame. In Chapters 7 some minimum cost design problems of stiffened and cellular plates and shells are worked out for cases of different stiffenings and loads...

  5. Functionally Graded Mo sintered steels

    Directory of Open Access Journals (Sweden)

    Manuel Cisneros-Belmonte

    2016-12-01

    Full Text Available Functionally graded materials (FGM, the multi-materials, strive to satisfy the numerous requirements demanded of parts in a given combination of compositions and microstructures. The required material compatibility lead the manufacturing process and the achieving of an interface, not always diffuse. Powder metallurgy is one of the techniques used in manufacturing functionally graded materials, in particular the compaction matrix of the possible techniques for forming these materials. In this paper, a process of forming a functionally graded steel based on the use of a high molybdenum steel with cooper and other steel with copper, without molybdenum, is proposed with the aim of concentrating this element to the surface of the workpiece, increasing the mechanical strength. The study is completed with the evaluation of physical properties (density and porosity distribution, mechanical properties (hardness, tensile strength and elongation and microstructural analysis by optical and scanning electron microscopy.

  6. Chemical decontamination of stainless steel

    International Nuclear Information System (INIS)

    Onuma, Tsutomu; Akimoto, Hidetoshi

    1991-01-01

    The present invention concerns a method for chemical decontamination of radioactive metal waste materials contaminated with radioactive materials on the surface, generated in radioactive materials-handling facilities. The invention is comprised of a method of chemical decontamination of stainless steel, characterized by comprising a first process of immersing a stainless steel-based metal waste material contaminated by radioactive materials on the surface in a sulfuric acid solution and second process of immersing in an aqueous solution of sulfuric acid and oxidizing metal salt, in which a portion of the surface of the stainless steel to be decontaminated is polished mechanically to expose a portion of the base material before the above first and second processes. 1 figs., 2 tabs

  7. Corrosion of carbon steel welds

    International Nuclear Information System (INIS)

    Daniel, B.

    1988-09-01

    This report assesses the factors which cause preferential attack to occur in carbon steel fusion welds. It was concluded that the main factors were: the inclusion content of the weld metal, the potential of the weld metal being less noble than that of the parent, and the presence of low-temperature transformation products in the heat-affected zone of the weld. These factors should be minimized or eliminated as appropriate so that the corrosion allowances determined for carbon steel waste drums is also adequate for the welds. An experimental/theoretical approach is recommended to evaluate the relative corrosion resistance of welds prepared from BS 4360 grade 43A steel to that of the parent material. (author)

  8. Boron Steel: An Alternative for Costlier Nickel and Molybdenum Alloyed Steel for Transmission Gears

    Directory of Open Access Journals (Sweden)

    A. Verma

    2010-06-01

    Full Text Available Case Carburized (CC low carbon steels containing Ni, Cr and Mo alloying elements are widely used for transmission gears in automobile, as it possesses desired mechanical properties. In order to cut cost and save scarce materials like Ni and Mo for strategic applications, steel alloyed with Boron has been developed, which gives properties comparable to Ni-Cr-Mo alloyed steel. In the process of steel development, care was taken to ensure precipitation of boron which results in precipitation hardening. The characterization of the developed boron steel had exhibited properties comparable to Ni-Cr-Mo alloyed steel and superior to conventional boron steel.

  9. Implementation of a qualitymanagementsystem according to DIN EN ISO 9001 within the Department BG B of DSK; Einfuehrung eines Qualitaetsmanagementsystems nach DIN EN ISO 9001 im Bereich Bautechnik und Bergschaeden (BG B) der DSK

    Energy Technology Data Exchange (ETDEWEB)

    Fischer, P. [Servicebereich Standort- und Geodienste der Deutschen Steinkohle AG, Herne (Germany); Sackel, M.; Pektas, E. [Sackel Ingenieure, Dortmund (Germany)

    2007-06-15

    In accordance to the improvement to the ''New DSK'', the department KG B turns more and more into a competent service partner. This challenge will be enduringly supported by the implementation of a Qualitymanagementsystem according to DIN EN ISO 9001. The implementation of a Qualitymanagementsystem is a multiple process. The integration during the regular business process forces experienced coaching. In this article, the basics of the QM-Standards will be explained and the implementation in department BG B will be introduced by certain examples. (orig.)

  10. Ventilation components according to DIN 1946-6. Messages from the C.A.T.S. Academy; Lueftungskomponenten nach DIN 1946-6. Mitteilungen aus der C.A.T.S.-Academy

    Energy Technology Data Exchange (ETDEWEB)

    Nadler, Norbert [CSE Nadler, Oranienburg (Germany)

    2011-07-01

    On the one hand, the buildings are performed tightly according to the building regulations, on the other hand a minimum of air change is to be ensured. The former demand for air change by manual opening of the windows is no longer accepted. The calculation method of the regulation DIN 1946-6 enables both the establishment of a ventilation concept as well as an interpretation of the ventilation components. A critical evaluation of the regulation and the demands of practice result in necessary amendments which result in requirements of the appropriate software. The implementation of these requirements exemplary is demonstrated on the basis od the new C.A.T.S. ventilation.

  11. Monitoring of dams according to German standard DIN 19 700 on the basis of a GIS based expert system; Stauanlagenueberwachung nach DIN 19 700 in Verbindung mit Expertensystemen auf GIS-Basis

    Energy Technology Data Exchange (ETDEWEB)

    Kast, Karl; Saucke, Ulrich; Elsaesser, Ralph [Dr.-Ing. Karl Kast + Partner (GbR) Ingenieurgemeinschaft fuer Umwelt- und Geotechnik, Ettlingen (Germany)

    2010-07-01

    The German standard DIN 19 700 stipulates regular safety reports assessing dams and their operation as part of the continuous dam monitoring scheme. Experience has shown that a GIS based dam monitoring system exhibits evident advantages regarding a continuous assessment. Besides and easy access to all relevant information grouped by themes, it offers a graphic analysis of measuring data and their display in the GIS system. In addition, concerning relevant failure mechanism, individual modules of a GIS based expert system are designed for the purpose of assessing the safety of the dam in the event of uncommon incidents. (orig.)

  12. ESF GROUND SUPPORT - STRUCTURAL STEEL ANALYSIS

    Energy Technology Data Exchange (ETDEWEB)

    T. Misiak

    1996-06-26

    The purpose and objective of this analysis are to expand the level of detail and confirm member sizes for steel sets included in the Ground Support Design Analysis, Reference 5.20. This analysis also provides bounding values and details and defines critical design attributes for alternative configurations of the steel set. One possible configuration for the steel set is presented. This analysis covers the steel set design for the Exploratory Studies Facility (ESF) entire Main Loop 25-foot diameter tunnel.

  13. Corrosion behaviour of laser clad stainless steels

    International Nuclear Information System (INIS)

    Damborenea, J.J. de; Weerasinghe, V.M.; West, D.R.F.

    1993-01-01

    The present paper is focussed in the study of the properties of a clad layer of stainless steel on a mild steel. By blowing powder of the alloy into a melt pool generated by a laser of 2 KW, an homogeneous layer of 316 stainless steel can be obtained. Structure, composition and corrosion behaviour are similar to those of a stainless steel in as-received condition. (Author)

  14. Modern steels for light automobiles (review)

    Science.gov (United States)

    Tikhonov, A. K.

    1994-10-01

    The article considers the directions of work at VAZ together with metallurgists of the CIS for creating highly efficient economically-alloyed and microalloyed steels; highly ductile forged steels with improved corrosion resistance coated with zinc and with good stamping, welding, and painting capacity. Steels are created for petrol tanks with aluminum-zinc coatings instead of lead, and new heat and corrosion-resistant steels are developed for automobile exhaust gas systems.

  15. Inclusion control in high-performance steels

    International Nuclear Information System (INIS)

    Holappa, L.E.K.; Helle, A.S.

    1995-01-01

    Progress of clean steel production, fundamentals of oxide and sulphide inclusions as well as inclusion morphology in normal and calcium treated steels are described. Effects of cleanliness and inclusion control on steel properties are discussed. In many damaging constructional and engineering applications the nonmetallic inclusions have a quite decisive role in steel performance. An example of combination of good mechanical properties and superior machinability by applying inclusion control is presented. (author)

  16. Osservazione dei fenomeni deformativi nel centro di Roma. Dall'applicazione di tecniche avanzate DInSAR, all'analisi qualitativa della natura del rumore dei dati COSMO Sky-Med

    OpenAIRE

    Massimo Morigi

    2015-01-01

    This work was created to focus the attention on a particular aspect of theequivocation (aliasing) of the measurements made with Differential SAR interferometry (DInSAR) X-band for the presence of snow. Such equivocationemerge after a careful interpretation of the results obtained through theapplication of techniques Advanced DInSAR (A-DInSAR) for the observation ofthe deformation phenomena of the monumental structures in the center ofRome. The qualitative analysis have enabled the identificat...

  17. Boron steel. I Part. Preparation

    International Nuclear Information System (INIS)

    Jaraiz Franco, E.; Esteban Hernandez, J. A.

    1960-01-01

    With the advent of the first nuclear reactors arise the need for control rods and shielding duties for some types of radiations. One of the materials used for this purpose has been the high boron steel. This paper describes the melting and casting procedures employed for the production, at laboratory scale, of steels with Boron content ranging from 1 to 4 per cent, as well as the metallographic and X-Ray techniques used for the identification of the present phases. The electrolytic technique employed for the isolation of the Fe 2 B phase and its subsequent X-Ray identification has proved to be satisfactory. (Author) 11 refs

  18. Plating on stainless steel alloys

    International Nuclear Information System (INIS)

    Dini, J.W.; Johnson, H.R.

    1981-01-01

    Quantitative adhesion data are presented for a variety of electroplated stainless steel type alloys. Results show that excellent adhesion can be obtained by using a Wood's nickel strike or a sulfamate nickel strike prior to final plating. Specimens plated after Wood's nickel striking failed in the deposit rather than at the interface between the substrate and the coating. Flyer plate quantitative tests showed that use of anodic treatment in sulfuric acid prior to Wood's nickel striking even further improved adhesion. In contrast activation of stainless steels by immersion or cathodic treatment in hydrochloric acid resulted in very reduced bond strengths with failure always occurring at the interface between the coating and substrate

  19. Steeling and Resilience in Art Education

    Science.gov (United States)

    Heise, Donalyn

    2014-01-01

    Steel is an incredibly strong alloy of iron and carbon. Due to its incredible strength and durability, this resilient material is commonly used for constructing buildings. The transitive verb "steeling" is defined in Miriam-Webster dictionary as "to fill with resolution or determination, as in, she 'steeled herself to face the…

  20. A model for TRIP steel constitutive behaviour

    NARCIS (Netherlands)

    Perdahcioglu, Emin Semih; Geijselaers, Hubertus J.M.; Menari, G

    2011-01-01

    A constitutive model is developed for TRIP steel. This is a steel which contains three or four different phases in its microstructure. One of the phases in TRIP steels is metastable austenite (Retained Austenite) which transforms to martensite upon deformation. The accompanying transformation strain

  1. Microstructural Development during Welding of TRIP steels

    NARCIS (Netherlands)

    Amirthalingam, M.

    2010-01-01

    The Advanced High Strength Steels (AHSS) are promising solutions for the production of lighter automobiles which reduce fuel consumption and increase passenger safety by improving crash-worthiness. Transformation Induced Plasticity Steel (TRIP) are part of the advanced high strength steels which

  2. O enfermeiro como coordenador de grupos: contribuições da Dinâmica de Grupo

    Directory of Open Access Journals (Sweden)

    Carla Natalina da Silva Fernandes

    2008-03-01

    Full Text Available Na enfermagem a utilização do recurso grupal tem sido utilizada para trabalhar com pessoas o que exige dos profissionais um conhecimento específico, para atender aos objetivos do grupo sem causar danos aos envolvidos. O objetivo desta pesquisa foi discutir à luz do referencial teórico da Dinâmica de Grupo os atributos desejáveis para o enfermeiro como coordenador de grupos, suas possibilidades e limitações. Trata-se de uma investigação teórica, de natureza descritiva e analítica desenvolvida por meio de pesquisa bibliográfica. Consideramos como fontes bibliográficas, inicialmente, os livros clássicos de Lewin (1948, Mailhiot (1981 e Cartwright e Zander (1975 por serem as primeiras referências na construção da ciência da dinâmica de grupo e, ainda, para a discussão teórica, a contribuição de outros autores da literatura contemporânea nacional e internacional, de acordo com sua adequação ao objetivo proposto nesse trabalho. A análise das obras foi direcionada pelo interesse na busca de elementos para o alcance do objetivo proposto. Estruturamos os resultados do trabalho em três capítulos. O primeiro capítulo Dinâmica e Funcionamento de Grupo: perspectiva histórica, conceito e fundamentos, traz conceitos fundamentais sobre a origem da dinâmica de grupo e os pressupostos iniciais. Discutimos as diferentes e complementares concepções de grupo, sendo que a fundamentação teórica e filosófica do coordenador norteará o caminho da satisfação dos objetivos propostos pelo grupo. No segundo capítulo Coordenação de Grupos: fundamentos da Ciência da Dinâmica de Grupo, abordamos os aspectos da coordenação de grupo, incluindo o planejamento e várias fases que o grupo percorre no seu desenvolvimento. Discutimos ainda os fundamentos para a sistematização da atividade grupal. No último capítulo: O enfermeiro como coordenador de grupos: discutindo caminhos para a atuação na assistência, formação de

  3. DInSAR time series generation within a cloud computing environment: from ERS to Sentinel-1 scenario

    Science.gov (United States)

    Casu, Francesco; Elefante, Stefano; Imperatore, Pasquale; Lanari, Riccardo; Manunta, Michele; Zinno, Ivana; Mathot, Emmanuel; Brito, Fabrice; Farres, Jordi; Lengert, Wolfgang

    2013-04-01

    One of the techniques that will strongly benefit from the advent of the Sentinel-1 system is Differential SAR Interferometry (DInSAR), which has successfully demonstrated to be an effective tool to detect and monitor ground displacements with centimetre accuracy. The geoscience communities (volcanology, seismicity, …), as well as those related to hazard monitoring and risk mitigation, make extensively use of the DInSAR technique and they will take advantage from the huge amount of SAR data acquired by Sentinel-1. Indeed, such an information will successfully permit the generation of Earth's surface displacement maps and time series both over large areas and long time span. However, the issue of managing, processing and analysing the large Sentinel data stream is envisaged by the scientific community to be a major bottleneck, particularly during crisis phases. The emerging need of creating a common ecosystem in which data, results and processing tools are shared, is envisaged to be a successful way to address such a problem and to contribute to the information and knowledge spreading. The Supersites initiative as well as the ESA SuperSites Exploitation Platform (SSEP) and the ESA Cloud Computing Operational Pilot (CIOP) projects provide effective answers to this need and they are pushing towards the development of such an ecosystem. It is clear that all the current and existent tools for querying, processing and analysing SAR data are required to be not only updated for managing the large data stream of Sentinel-1 satellite, but also reorganized for quickly replying to the simultaneous and highly demanding user requests, mainly during emergency situations. This translates into the automatic and unsupervised processing of large amount of data as well as the availability of scalable, widely accessible and high performance computing capabilities. The cloud computing environment permits to achieve all of these objectives, particularly in case of spike and peak

  4. performance of steel slag performance of steel slag as fine

    African Journals Online (AJOL)

    eobe

    Suitability of using steel slag (SS) as substitute for sand in concrete was ... The strength of SS concrete increased with increase in proporti. 10 mm. .... additives used. All other oxides ..... low lime coal fly ash in foamed concrete”, Fuel, Vol. 84,.

  5. Teaching Steel Connections Using an Interactive Virtual Steel Sculpture

    Science.gov (United States)

    Moaveni, Saeed; Chou, Karen C.

    2015-01-01

    Steel connections play important roles in the integrity of a structure, and many structural failures are attributed to connection failures. Connections are the glue that holds a structure together. The failures of the Hartford Coliseum in 1977, the Hyatt Regency Hotel in Kansas City in 1980, and the I-35W Bridge in Minneapolis in 2007 are all…

  6. Physical characterization of steel and stainless steel metal powders

    International Nuclear Information System (INIS)

    Lavilla, A.O.; Lucchesi, C.G.; Sandin, O.O.

    1991-01-01

    A methodology has been developed for the physical characterization of steel powders (obtained by atomization) for later sintering and for the construction of porous sheets and filtrating tubes, capable of operating at temperatures between 600 deg C and 800 deg C in corrosive atmospheres. This methodology was based on the equipment and methods used for the physical characterization of uranium oxide powders. (Author) [es

  7. Some comments about the situation of the Steel Industry in the Arab Countries (Arab Steel Summit)

    International Nuclear Information System (INIS)

    Haidar, Y.; Astier, J.

    2009-01-01

    The Arab Steel Summit, that convened in Abu Dhabi in April, gave us another opportunity to review the situation of the Arab Iron and Steel Industry, with regard to the present World economic context. We will address: - the World situation of steel production, focusing on the Arab Countries; - the related situation of steel consumption; - the steel trade, including imports, exports and prices; - the consequences for technology and economy. (authors)

  8. Modelo de capacidad dinámica de aprendizaje organizacional: experiencia de la biotecnológia en Cuba

    Directory of Open Access Journals (Sweden)

    Marle Pérez de Armas

    2016-01-01

    Full Text Available La experiencia y práctica internacional fundamentan el conocimiento como recurso estratégico y resultado del aprendizaje organizacional, lo que conduce a plantear la Capacidad Dinámica de Aprendizaje Organizacional vinculada con la obtención de resultados de desempeños positivos y fuente de ventajas competitivas. En este sentido, la empresa de alta tecnología (EAT del sector de la biotecnología en Cuba representa una experiencia singular lo que se vincula con el problema científico, ya que se necesita explicar, sobre bases científicas, cómo el desarrollo de la Capacidad Dinámica de Aprendizaje Organizacional contribuye a fundamentar el éxito alcanzado por empresas líderes del sector, y que a su vez posibiliten su extensión a otras de su tipo en el sector. A partir de la utilización de la metodología de estudio de caso aplicada al Centro de Inmunología Molecular como caso piloto y el juicio de expertos se obtiene como, principal resultado, un modelo conceptual que fundamenta y explica el éxito alcanzado por empresas líderes de alta tecnología del sector biotecnológico cubano desde el desarrollo de la Capacidad Dinámica de Aprendizaje Organizacional y sus tres dimensiones claves: elementos de gestión técnico-organizativos, comportamiento organizacional y actores externos.

  9. Modelo de capacidad dinámica de aprendizaje organizacional: experiencia de la biotecnología en Cuba

    Directory of Open Access Journals (Sweden)

    Marle Pérez De Armas

    2016-06-01

    Full Text Available La experiencia y práctica internacional fundamentan el conocimiento como recurso estratégico y resultado del aprendizaje organizacional, lo que conduce a plantear la Capacidad Dinámica de Aprendizaje Organizacional vinculada con la obtención de resultados de desempeños positivos y fuente de ventajas competitivas. En este sentido, la empresa de alta tecnología (EAT del sector de la biotecnología en Cuba representa una experiencia singular lo que se vincula con el problema científico, ya que se necesita explicar, sobre bases científicas, cómo el desarrollo de la Capacidad Dinámica de Aprendizaje Organizacional contribuye a fundamentar el éxito alcanzado por empresas líderes del sector, y que a su vez posibiliten su extensión a otras de su tipo en el sector. A partir de la utilización de la metodología de estudio de caso aplicada al Centro de Inmunología Molecular como caso piloto y el juicio de expertos se obtiene como, principal resultado, un modelo conceptual que fundamenta y explica el éxito alcanzado por empresas líderes de alta tecnología del sector biotecnológico cubano desde el desarrollo de la Capacidad Dinámica de Aprendizaje Organizacional y sus tres dimensiones claves: elementos de gestión técnico-organizativos, comportamiento organizacional y actores externos.

  10. Unsupervised SBAS-DInSAR Processing of Space-borne SAR data for Earth Surface Displacement Time Series Generation

    Science.gov (United States)

    Casu, F.; de Luca, C.; Lanari, R.; Manunta, M.; Zinno, I.

    2016-12-01

    During the last 25 years, the Differential Synthetic Aperture Radar Interferometry (DInSAR) has played an important role for understanding the Earth's surface deformation and its dynamics. In particular, the large collections of SAR data acquired by a number of space-borne missions (ERS, ENVISAT, ALOS, RADARSAT, TerraSAR-X, COSMO-SkyMed) have pushed toward the development of advanced DInSAR techniques for monitoring the temporal evolution of the ground displacements with an high spatial density. Moreover, the advent of the Copernicus Sentinel-1 (S1) constellation is providing a further increase in the SAR data flow available to the Earth science community, due to its characteristics of global coverage strategy and free and open access data policy. Therefore, managing and storing such a huge amount of data, processing it in an effcient way and maximizing the available archives exploitation are becoming high priority issues. In this work we present some recent advances in the DInSAR field for dealing with the effective exploitation of the present and future SAR data archives. In particular, an efficient parallel SBAS implementation (namely P-SBAS) that takes benefit from high performance computing is proposed. Then, the P-SBAS migration to the emerging Cloud Computing paradigm is shown, together with extensive tests carried out in the Amazon's Elastic Cloud Compute (EC2) infrastructure. Finally, the integration of the P-SBAS processing chain within the ESA Geohazards Exploitation Platform (GEP), for setting up operational on-demand and systematic web tools, open to every user, aimed at automatically processing stacks of SAR data for the generation of SBAS displacement time series, is also illustrated. A number of experimental results obtained by using the ERS, ENVISAT and S1 data in areas characterized by volcanic, seismic and anthropogenic phenomena will be shown. This work is partially supported by: the DPC-CNR agreement, the EPOS-IP project and the ESA GEP project.

  11. Lifetime of Manet steel in load-cycling tests in vacuum at 20 and 550deg C

    International Nuclear Information System (INIS)

    Ullmaier, H.; Schmitz, W.

    1989-01-01

    Fatigue tests in vacuum were carried out on the Manet heat of DIN 1.4914 martensitic steel (X13Cr10.7Ni0.85Mo0.75V0.22) in push-pull type, stress-controlled experiments at room temperature and 823 K. The fatigue life was determined as a function of stress amplitude, mean stress, frequency and hold time. At 823 K creep has a strong influence on the life time, particularly at low frequencies and long hold times in tension. The results are phenomenologically described by a simple linear damage summation approach. Even at room temperature the life time of specimens tested in vacuum is about an order of magnitude higher than of those tested in air. This stresses the importance of providing the correct test environment in collecting fatigue data for the design of fusion devices. (orig./MM)

  12. Some aspects of thermal fatigue in stainless steel

    International Nuclear Information System (INIS)

    Iorio, A.F.; Crespi, J.C.

    1987-01-01

    This paper is concerned with the analysis of failures in a moderator circuit branch piping of the ATUCHA-I pressurized heavy water reactor (PHWR), made of austenitic steel to DIN 1.4550 specification (similar to AISI 347). These failures are considered to result from a thermal fatigue processes induced by fluctuations in a zone where stratified temperature layers occurred -the fluctuations being associated with variations in the heavy water flow. The first section evaluates the possibility of cracking due to thermal fatigue phenomena and concludes that under service conditions a crack may be initiated and growth through 7 mm of the wall thickness of the pipe. Laboratory thermal fatigue tests that simulated the thermomechanical conditions for such a component, showed that the number of cycles required to initiate a thermal fatigue crack in a notched modified standard fatigue specimen was about 10 3 . This value may be used to give a conservative prediction of the number of thermal cycles for crack initiation in actual station piping, including those who suffered a cold plug condition which is produced in some emergency shut-down and valve testing situations. It was also demonstrated that beyond a crack depth of 7 mm stress corrosion cracking has the main process in further crack propagation. The relevance of this prediction has been confirmed by microfractographic observations, since the brittle nature of the fracture surfaces under service conditions appears very different from the transgranular ductile striations found in both thermal and mechanical fatigue test specimens as a result of environmental effects. (Author)

  13. Factores asociados a la depresión en adolescentes: Rendimiento escolar y dinámica familiar

    OpenAIRE

    Galicia Moyeda, Iris Xóchitl; Sánchez Velasco, Alejandra; Robles Ojeda, Francisco Javier

    2009-01-01

    El estudio de la relación entre depresión y aprovechamiento escolar en adolescentes no ha sido totalmente esclarecida dado que se emplean diferentes instrumentos para la evaluación de la depresión y di-versos parámetros para estimar el aprovechamiento académico. Por otra parte cabe señalar que aunque se ha analizado la influencia de la dinámica familiar en la depresión y en el rendimiento académico ésto ha sido de manera independiente. Participaron 245 escolares adolescentes para analizar...

  14. Percepción de la persona con obesidad sobre su dinámica familiar, Cuenca. 2016

    OpenAIRE

    Mora Verdugo, Miriann Alexandra

    2017-01-01

    Antecedente: Al analizar la familia no se trata de adoptar el concepto de la cultura occidental que indica es un grupo formado por marido, mujer e hijos 1. La familia es vista como un sistema, padres e hijos son subsistemas que interactúan2. Muchas veces esta parte es invisible. Distintas disciplinas han estudiado a la familia pero los resultados que presentan son fragmentados3. No se analiza a profundidad la dinámica familiar, en su estructura, su tipología, jerarquía, roles, holones, triang...

  15. Dinámica del ciclo del nitrógeno y fósforo en suelos

    Directory of Open Access Journals (Sweden)

    Fabio Ancízar Aristizábal Gutiérrez

    2012-01-01

    Full Text Available Título en ingles: Nitrogen and phosphorus cycles dynamics in Soils Resumen: Los ciclos biogeoquímicos del fósforo (P y del nitrógeno (N son sistemas dinámicos que suceden a través de la biosfera, de cuyos mecanismos de transformación depende la disponibilidad de estos elementos para diferentes formas de vida.  Se acepta que la diversidad y actividad de las poblaciones microbianas posee un papel crucial en la dinámica de los nutrientes y por tanto el desafío está en comprender, como responden a las condiciones ambientales. La actividad microbiana en los suelos depende tanto de la condición del recurso y como de sus propiedades químicas, físicas y biológicas.  En este documento se describen conceptos que se han empleado para entender la dinámica del nitrógeno y el fósforo, con el propósito de discutir cómo las características de las diferentes fracciones orgánicas y minerales seleccionan el potencial biológico encargado del recambio de dichos elementos,  panorama que actualmente se aborda a través de técnicas independientes del cultivo para estudiar las poblaciones microbianas in situ.  Palabras clave: dinámica de N y P; disponibilidad de nutrientes en suelo; fracciones orgánicas e inorgánicas y actividad microbiana. Abstract: Biogeochemical cycle’s phosphorus (P and nitrogen (N are dynamic systems taking place through the biosphere, whose mechanisms of transformation depends on the availability of these elements for different forms of life.  It is accepted that the diversity and activity of microbial populations plays a crucial role in nutrient dynamics and therefore the challenge is to understand how they respond to environmental conditions. Microbial activity in soils depends on both the resource condition and its chemical, physical and biological properties. Concepts described herein have been used to understand the nitrogen and phosphorus dynamics, with the aim to discuss how the characteristics of the

  16. Análise conjunta da dinâmica territorial e industrial: o caso da IKEA – Swedwood

    OpenAIRE

    Correia, Ricardo; Brito, Carlos Henrique

    2009-01-01

    Nenhuma região é uma ilha. As regiões contêm realidades que dependem de relacionamentos estabelecidos entre actores localizados em diversos espaços geográficos. Por isso, o sucesso de uma região não surge instantaneamente mas resulta de um longo processo de interacções entre diferentes empresas e organizações localizadas em diversas regiões. Desta forma, a dinâmica territorial passa em grande medida pela da rede de relacionamentos das empresas que operam no território. Tendo por base uma abor...

  17. Alcance y limitaciones de la carga dinámica de la prueba en el proceso judicial

    OpenAIRE

    Montilla Rosero, Carmen Alicia; Jiménez Pascuaza, Johana Marcela

    2016-01-01

    La carga dinámica de la prueba hace parte del derecho probatorio que le brinda más beneficios a la parte procesal que se encuentre en mejores condiciones de hacerlo. Este tipo de carga procesal fue usada por el Consejo de Estado para resolver episodios de responsabilidad administrativa por la actividad médica entre los años 1990 a 2006, debido a las dificultades con las que contaba el paciente para probar hechos constitutivos de la falla del servicio médico estatal. Al inicio, la carga probat...

  18. Reconfigurando aplicaciones multi-cloud con líneas de producto software dinámicas

    OpenAIRE

    Cubo, Javier; Gámez,Nadia; Pimentel, Ernesto; Fuentes, Lidia

    2016-01-01

    La reconfiguración dinámica de aplicaciones multi-cloud es un reto complejo aún no suficientemente explorado. En estos entornos las aplicaciones o sus módulos pueden estar desplegados en diferentes proveedores. Por lo tanto, reconfigurar en tiempo de ejecución estas aplicaciones puede requerir la modificación de la distribución en múltiples y heterogéneos proveedores. Obtener la nueva distribución para que sigan funcionando correctamente las aplicaciones no es una tarea senc...

  19. Diversidad sexual en la escuela: dinámicas pedagógicas para enfrentar la homofobia

    OpenAIRE

    García Suárez, Carlos Iván

    2007-01-01

    Colombia Diversa presenta la cartilla “Diversidad sexual en la escuela. Dinámicas pedagógicas para enfrentar la homofobia”, con el ánimo de ofrecer instrumentos pedagógicos para abordar el tópico y la presencia de la diversidad sexual en las instituciones educativas, así como las reacciones discriminativas, intolerantes y violentas en contra suya. Somos conscientes de que este tema genera altas dosis de sensibilidad y que la problemática significativa que abarca ha permanecido invisible por a...

  20. Dinámica de los predictores de adopción de Internet en Medellín

    OpenAIRE

    Díez Arango, Daniela; Lalinde Mery, David

    2016-01-01

    En este trabajo se propone analizar la dinámica del impacto asociado a algunos predictores de la adopción de internet en la ciudad de Medellín (Colombia), utilizando como base de datos la Encuesta de calidad de vida de Medellín (ECV) desde el año 2006 a 2014 -- Se analizarán que variables inciden en la tenencia de internet, se realizará la estadística descriptiva necesaria, y regresiones mediante los modelos Logit y Probit -- El acceso a internet aún se encuentra reservado para una parte priv...

  1. Instrumentos de avaliação da postura dinâmica: aplicabilidade ao ambiente escolar

    Directory of Open Access Journals (Sweden)

    Matias Noll

    Full Text Available INTRODUÇÃO: Para que a avaliação da postura dinâmica seja efetivada é necessário, primeiramente, conhecer os diversos instrumentos, disponíveis e validados na literatura, apropriados para esse fim. OBJETIVO: O objetivo deste artigo de revisão sistemática foi descrever, sintetizar e analisar criticamente os instrumentos encontrados na literatura que objetivem avaliar a postura dinâmica, tanto em adultos quanto em escolares, e refletir sobre a possibilidade de utilização desses métodos no ambiente escolar. MATERIAIS E MÉTODOS: Foi realizada uma busca sistemática de artigos em bases de dados (Scopus, ScienceDirect, PubMed, SciELO publicados a partir da década de 1980 e no Banco de Teses e Dissertações da Capes. As palavras-chave utilizadas na busca pelos artigos foram back, spine, back injuries, school, back school, postural hygiene program, education, child, student, posture, em combinação com as palavras-chave evaluation, assessment, measurement, e os respectivos termos em português. Os instrumentos propostos deveriam preencher os seguintes critérios: (a avaliar a postura corporal durante a realização de atividades da vida diária (AVDs; (b utilizar critérios pré-definidos de avaliação da postura dinâmica; e (c avaliar a postura a partir de observação, direta ou a partir de filmagem. RESULTADOS: Foram identificados oito artigos originais que apresentam instrumentos de avaliação da postura dinâmica, avaliando a execução de AVDs a partir de critérios biomecânicos pré-definidos por escalas numéricas; destes, apenas quatro instrumentos foram elaborados com o propósito de avaliar a execução de AVDs de escolares. CONSIDERAÇÕES FINAIS: Em geral, os instrumentos apresentam algumas limitações metodológicas, embora sejam de fácil aplicabilidade.

  2. CONŢINUTUL METALELOR GRELE ÎN COMPONENTELE MEDIULUI DIN ZONA DE CENTRU A REPUBLICII MOLDOVA

    Directory of Open Access Journals (Sweden)

    Olesea GLIGA

    2016-02-01

    Full Text Available Scopul acestei lucrări rezidă în determinarea conţinutului unor metale grele (Pb, Cd şi Cu în componentele mediu­lui (sol, apă şi floră din zona de centru a Republicii Moldova. Au fost selectate 4 situri de studiu, cu diferit impact antropic, din care au fost prelevate probe de sol, apă şi floră. Conţinutul de metale grele în componentele de mediu au fost deter­minate prin Spectrometria de Absorbţie Atomică cu atomizare termică. Rezultatele cercetărilor au demonstrat prezenţa metalelor cercetate în toate probele de sol şi floră analizate şi lipsa acestora în probele de apă, cu excepţia Cu. Concen­tra­ţiile de Pb, Cd şi Cu în solurile din siturile antropizate (industrial şi transport auto au fost mai mari în comparaţie cu cele din situl forestier (td = 2,05 - 4,36; P < 0,05 - 0,001. Analogic celor din sol, şi concentraţiile acestora în flora meliferă pre­levată din siturile antropizate au înregistrat valori mai mari în comparaţie cu cel forestier (td = 1,19 - 4,0; P > 0,1 - <0,001. De asemenea, şi concentraţia de Cu în mostrele de apă prelevate din siturile industrial şi transport auto a fost mai mare în comparaţie cu cele din situl forestier (td = 2,0 - 5,17; P < 0,1- 0,001. Putem constata că concentraţia metalelor grele cercetate în componentele mediului este în funcţie de prezenţa surselor de poluare din aceste situri. Totodată, în toate siturile cercetate nu au fost constatate depăşiri ale nivelurilor maximal admisibile, conform normelor în vigoare. THE CONTENT OF HEAVY METALS IN THE ENVIRONMENTAL COMPONENTS IN THE CENTRAL AREA OF THE REPUBLIC OF MOLDOVA The aim of this paper was to determine the content of heavy metals (Pb, Cd and Cu in the environmental components (soil, water and flora in the central area of the Republicof Moldova. Have been selected 4 study sites with different human impact, from which have been collected samples of soil, water and flora. The heavy metal

  3. Arquitectura para balancear carga dinámica por demanda adaptativa, utilizando CORBA en JAVA-IDL

    OpenAIRE

    Jesús Chávez Esparza; Gerardo Rentería Castillo; Francisco Javier Luna Rosas

    2008-01-01

    En este trabajo desglosaremos la elaboración de una nueva Arquitectura para balancear carga dinámica, por demanda adaptativa, utilizando CORBA en JAVA-IDL. Una arquitectura de balanceo de carga es un sistema que permite distribuir el trabajo computacional entre varias máquinas, con el objetivo de reducir el tiempo de respuesta global del sistema. A través de las pruebas se justifica el uso de la arquitectura y se definen los parámetros a considerar para obtener un óptimo desempeño, refiriéndo...

  4. Turismo balnear e dinâmicas territoriais: casos de estudo - Praia de Mira e Praia da Tocha

    OpenAIRE

    Miranda, Paulo Manuel Maranhão de

    2017-01-01

    Tese de doutoramento em Geografia, no ramo de Geografia Humana, apresentada ao Departamento de Geografia e Turismo da Faculdade de Letras da Universidade de Coimbra Os territórios do litoral oferecem um campo permanente para a investigação geográfica. Descrever as dinâmicas territoriais da paisagem litoral é descobrir as reações dos sistemas naturais à ação do ser humano, bem como, colocar em evidência a formação das complexas formas de vivenciar o espaço marítimo, de que somos todos herde...

  5. Quality management in a radiological practice: experiences with a certification for DIN EN ISO 9001:2000.

    Science.gov (United States)

    Kirsch, Michael; Vogg, Ingrid; Hosten, Norbert; Flessa, Steffen

    2010-07-01

    This paper describes the introduction of a total quality management system in a radiological practice. Certification was based on DIN EN ISO 9001:2000. The implementation of the quality management system had to overcome a number of barriers, for instance, legal obligations of a partnership association, leadership problems, and the fear to loose all hindered implementation. The knowledge of these barriers induces a faster and cheaper implementation of a quality management system in a radiological practice as a foundation of improved quality and competitiveness. Copyright 2009 Elsevier Ireland Ltd. All rights reserved.

  6. Propuesta de desarrollo organizacional para la competitividad del Club Dinámico del centro de la ciudad de Pereira

    OpenAIRE

    Cardona Londoño, Luisa Fernanda; Ospina Duque, Valentina

    2014-01-01

    Este proyecto es la respuesta a una propuesta de Desarrollo Organizacional para 38 Mipymes ubicadas en el centro de la ciudad de Pereira, cuyos elementos comerciales varían entre bisutería, calzado, joyería y vestuario. La investigación fue realizada dentro del macro Proyecto “Club Dinámico del Centro de la Ciudad de Pereira”, dirigido por FENALCO Risaralda, el cual pretende integrar el sector comercio con el sector turismo mediante la formulación de diversas estrategias que permitan asociar ...

  7. Dinámica de una ecuación de reacción-difusión con discontinuidades

    OpenAIRE

    Arrieta Algarra, José María; Rodríguez Bernal, Aníbal; Valero Cuadra, José

    2007-01-01

    Estudiamos la dinámica de una ecuación de reacción difusión que presenta una discontinuidad. En primer lugar probamos la semicontinuidad superior del atractor con respecto a aproximaciones suaves del término no lineal. Después damos una descripción precisa del conjunto de puntos fijos y su estabilidad. Finalmente, analizamos las posibles conexiones heteroclínicas entre los puntos fijos, obteniendo así información sobre la estructura del atractor.

  8. Desempenho do equilíbrio dinâmico de escolares ouvintes e com perda auditiva sensorioneural

    Directory of Open Access Journals (Sweden)

    Renato de Souza Melo

    2014-12-01

    Full Text Available Introdução: O equilíbrio corporal humano é regulado pela atuação sensorial do sistema vestibular, situado na orelha interna. Crianças com perda auditiva sensorioneural podem apresentar alterações no sistema vestibular e, consequentemente, no equilíbrio corporal, em decorrência da lesão na orelha interna. Objetivos: Avaliar o equilíbrio dinâmico em escolares ouvintes e com perda auditiva sensorioneural e comparar os dados entre os grupos considerando os sexos e as faixas etárias. Métodos: Estudo de corte transversal, que avaliou 96 escolares, sendo 48 ouvintes e 48 com perda auditiva sensorioneural, de ambos os sexos, na faixa etária entre sete e 18 anos. A avaliação do equilíbrio dinâmico foi realizada por meio do teste de Babinski-Weil e do teste de Fukuda. Para a análise dos dados foi utilizado o teste do qui-quadrado de Pearson, tendo em vista a distribuição de normalidade dos dados. Resultados: Os escolares com perda auditiva apresentaram maior ocorrência de alterações no equilíbrio dinâmico comparado aos ouvintes: teste de Babinski-Weil e teste de Fukuda: (p<0,001. A mesma diferença foi observada quando os voluntários foram agrupados pelos sexos: feminino e masculino: teste de Babinski-Weil e teste de Fukuda: (p<0,001. Estratificando-se pelas faixas etárias, os resultados apontaram diferenças, entre todos os grupos etários avaliados: teste de Babinski-Weil: sete a 14 anos: (p<0,001 e 15-18 anos: (p= 0,004, teste de Fukuda: sete a 18 anos: (p<0,001. Conclusão: Os escolares com perda auditiva apresentaram maior ocorrência de alterações no equilíbrio dinâmico que os ouvintes do mesmo sexo e faixa etária.

  9. Rashid al-Din. Shu’ab-i panjganah. 2. The Mongols and Turks (1 »

    Directory of Open Access Journals (Sweden)

    Chulpan I. Khamidova

    2016-09-01

    Full Text Available Research objectives and materials: The “Shu’ab-i panjganah” is a Persian manuscript of Rashid al-Din’s works – the medieval historian who lived in Persia and worked at the Ilkhanid court at the end of the 13th – beginning of the 14th centuries. The manuscript is a largely genealogical work written on the basis of a more comprehensive historical work of Rashid al-Din – “Jami al-Tawarikh”. “Shu’ab-i panjganah” contains genealogies of the prophets of Abrahamic religions, the rulers of the Arab Caliphate until the conquest of Baghdad by the Mongols, the Chinese dynasties and rulers of the Holy Roman Empire, as well as a list of the Popes. The greatest interest for this study is spurred by the fifth part, dedicated to the Chinggisids. The article presents a part of the translation of the 2nd chapter of the manuscript. This part contains a genealogical tree of Chinggis Khan (from his ancestor Dubun bayan, but without his descendants. The results of translation and analyses of the text of the manuscript could serve to various purposes: study of Rashid al-Din’s heritage, Great Horde history, genealogical history of Chinggis Khan and his descendants. The translation of the manuscript has never been published neither partly nor fully. Research results and novelty: The genealogy of Chinggis Khan’s ancestors contained in “Shu’ab-i panjganah” mainly repeats the information from “Jami al-Tawarikh”, although additional data is also available. Comparison of “Shu’ab-i panjganah” with brief genealogical tables in “Jami al-Tawarikh” shows that, on the one hand, “Shu’ab-i panjganah” is an addition to “Jami al-Tawarikh”, and on the other hand, the tables in “Jami al-Tawarikh” is a kind of rough version of the genealogical trees contained in “Shu’ab-i panjganah”.

  10. Regimes de endividamento, fragilidade financeira e dinâmica da atividade produtiva

    Directory of Open Access Journals (Sweden)

    Antonio J. A. Meirelles

    2003-09-01

    Full Text Available Elabora-se um modelo pós-keynesiano de utilização e crescimento da capacidade produtiva, no qual a oferta de moeda de crédito é endógena e o endividamento das firmas é explicitamente modelado. A taxa de juros é determinada pela aplicação de um mark-up sobre a taxa básica fixada pela autoridade monetária. O mark-up bancário varia intertemporalmente em conseqüência de mudanças no nível de atividade econômica, medido pela utilização da capacidade produtiva. Por seu turno, o grau de endividamento das firmas varia em função das taxas de lucro, de acumulação de capital físico e de juros. Em termos dinâmicos, mostra-se que é possível relacionar as condições de estabilidade do sistema formado pelas variáveis taxa de juros e grau de endividamento das firmas ao tipo de regime minskyano de financiamento hedge, especulativo ou Ponzi - prevalecente na economia.It is developed a post-keynesian dynamic macromodel of utilization and growth of productive capacity, in which the supply of credit-money is endogenous and firms' debt position is explicitly modeled. The interest rate is set by banks as a markup over the base rate, which is exogenously determined by the monetary authority. Over time, the banking markup varies in response to changes in the level of economic activity, which is measured by the utilization of productive capacity. In turn, firms' debt position varies according to the rates of profit, capital accumulation and interest. Regarding dynamics, it is shown the possibility of relating the stability properties of a system having the interest rate and the debt position by firms as state variables to the type of minskyan regime hedge, speculative or Ponzi which prevails among firms.

  11. Dinámicas y estrategias alimentarias instauradas en hogares de Medellín

    Directory of Open Access Journals (Sweden)

    Luz M. Arboleda-Montoya

    2014-09-01

    Full Text Available Resumen Objetivo: comprender la dinámica familiar alimentaria en hogares beneficiarios de programas de complementación alimentaria de Medellín en aspectos como las estrategias de consumo de alimentos instauradas en épocas de escasez de alimentos y en el rol asumido por las mujeres en el consumo alimentario. Metodología: el enfoque utilizado fue cualitativo, y el método de etnografía focalizada, con la utilización de técnicas como entrevistas individuales, entrevistas grupales y observaciones participantes. Resultados: entre los principales mecanismos instaurados en los hogares de beneficiarios de programas de complementación alimentaria para preservar el consumo acorde a lo acostumbrado están: hacer preparaciones con los alimentos que tienen disponibles en el hogar, servir porciones más pequeñas, consumir con mayor frecuencia alimentos económicos, del gusto familiar y de fácil preparación; tomar solo una bebida durante todo el día y disminuir el número de comidas al día. También se evidenció que es la mujer quien asume el papel principal en la obtención de los alimentos en el hogar, y en la preparación y servida; son estas quienes dan prioridad a la alimentación de los niños y son quienes menos alimentos consumen en el hogar. Objective: To understand the family dynamics food in household beneficiaries of supplementary food programs of Medellin such as food consumption strategies introduced in times of food shortages and in the role assumed by women in family feeding. Methodology: the approach was qualitative and the method was focused ethnography. Data was collected through techniques such as individual interviews, group interviews and participant observations. Results: the following are some of the main mechanisms implemented in the households benefiting from supplementary food programs to keep consumption at the usual levels: making preparations with foods that are available at home, serving smaller portions, consuming

  12. La dinámica poblacional y la violencia armada en Colombia, 1985-2010

    Directory of Open Access Journals (Sweden)

    Hernán Eduardo Salaya

    2014-09-01

    Full Text Available OBJETIVO: Describir la evolución de la estructura poblacional de los municipios de Colombia de acuerdo con su situación de desplazamiento interno como consecuencia de la violencia armada MÉTODOS: Para llevar a cabo la investigación se desarrolló un estudio ecológico descriptivo. Se consultaron fuentes secundarias tomadas del Registro Único de Población Desplazada y del Departamento Administrativo Nacional de Estadística con el fin de calcular las tasas de expulsión y recepción de población desplazada por la violencia en los años comprendidos entre el 2002 y el 2010. En base a estas tasas se construyeron cuatro grupos de municipios clasificados de la siguiente manera: alta expulsión, baja expulsión, alta recepción y baja recepción con aquellos municipios que en ese período permanecieron todos los años en el cuartil extremo de cada tasa. Posteriormente se tomaron dos puntos de corte comparativos en el tiempo 1985 y 2010. Se construyeron pirámides poblacionales e indicadores de estructura para cada uno de los grupos de municipios RESULTADOS: Los municipios expuestos a altas tasas de expulsión y de recepción presentaron una transición epidemiológica más lenta, con una edad media e índice de envejecimiento menores. El índice de Sundbärg permitió establecer que el grupo de alta expulsión fue el que menos regresión presentó. El grupo de alta recepción fue el que más disminuyó su índice de masculinidad sobre todo en la población ecomómicamente activa y fue el que más creció CONCLUSIONES: La dinámica poblacional ha sido afectada por la violencia armada y no tiene una distribución regular a lo largo del territorio colombiano lo que genera consecuencias sociales, económicas y culturales trascendentales. Este estudio es útil para la toma de decisiones y la construcción de política pública.

  13. Momentos liminares: dinâmica e significados no uso do preservativo

    Directory of Open Access Journals (Sweden)

    Emídio Gune

    2008-04-01

    Full Text Available O preservativo tem sido colocado no centro das estratégias de prevenção do VIH e das gravidezes não planificadas. Este artigo analisa a dinâmica e os significados associados ao seu uso e as implicações sobre os pressupostos subjacentes à sua promoção. Enquanto os pressupostos epidemiológicos consideram o uso do preservativo condição para a prática do sexo seguro, os pressupostos sociais tendem a considerar que as relações sexuais socialmente aceitáveis são per si seguras, excluindo, por conseguinte, o seu uso. Dado que ao longo da sua vida sexual activa os actores sociais alternam as suas práticas sexuais entre perigosas e seguras, verifica-se que o seu uso é, sobretudo, inconsistente. Tal cenário obriga a repensar a centralidade do preservativo como mecanismo de redução consistente do risco de uma gravidez não planificada ou de infecções de transmissão sexual.The prophylactic or condom has played a key role in the development of strategies for preventing HIV and unwanted pregnancy. This article examines the dynamics and meanings associated with its use, and the implications of the assumptions which underlie the promotion of this form of contraception. Whereas those whose arguments are based on epidemiological assumptions see prophylactic use as a mean of practising safe sex, those who argue from socially-based assumptions tend to see socially acceptable sexual relations as safe in themselves, and therefore as not requiring the use of the prophylactic. Given that social actors alternate between safe and unsafe sexual practices over the course of their lives, the facts are that prophylactic use is, above all, inconsistent. This requires us to rethink the key role of the prophylactic as a mean of consistently reducing the risk of unwanted pregnancy and of sexually transmitted infections.

  14. Cómo modelar el desarrollo y la dinámica de la ciudad latinoamericana

    Directory of Open Access Journals (Sweden)

    Axel Borsdorf

    2003-05-01

    Full Text Available Cuando en 1976 los primeros modelos de la ciudad latinoamericana fueron publicados, la región estaba todavía bajo la influencia económica de la estrategia de industrialización para la sustitución de importaciones. Los procesos económicos y de planificación, aun en el espacio urbano, estaban fuertemente dirigidos por el Estado. Desde entonces, todos los países latinoamericanos -con excepción de Cuba- cambiaron a un nuevo paradigma económico, basado en el neoliberalismo, y se percibe la fuerte influencia de la globalización. La retirada del Estado, la privatización y la desrregulación permitieron a los inversores, planificadores y ciudadanos mayores libertades. Todo esto puede ser observado en la estructura de las ciudades. Por tanto, es tiempo de adaptar los modelos, los cuales deben ser generalizaciones de la realidad, a la estructura actual de las ciudades. En orden a demostrar las dinámicas de la estructuración urbana, el desarrollo urbano es modelado en cuatro momentos, los cuales son identificados como el período de la ciudad colonial, la ciudad sectorial, la ciudad polarizada y finalmente, la ciudad fragmentada. Se intenta mantener elementos de modelos anteriores en uno nuevo, así como diferenciar con claridad el periodo mas reciente del desarrollo urbano de épocas anteriores.Abstract When in 1976 the first models of the Latin American city were published, the subcontinent was still under the economical influence of the strategy of industrialization for imports substitution. Economic and planning processes, even in the urban space, were strongly directed by the State. Since this time, all Latin American countries -with the exception of Cuba- changed to a new economic paradigm, based on neoliberalism, and a strong influence of globalization is to be noticed. The retreat of the State, privatization and de-regulation allow investors, planners and citizen much more liberties. All this can be noticed in the structure of the

  15. Génesis de la vida desde la dinámica procesual de la materia

    Directory of Open Access Journals (Sweden)

    Ignacio Núñez De Castro

    2015-03-01

    Full Text Available La Biología no trata de la vida, sino de la descripción fenomenológica de los organismos vivos; el estudio de la vida es propio de la Filosofía natural. Para tener un discurso coherente para describir un ser vivo necesitamos una serie de categorías: comprensión holística, sistema, proceso, emergencia de novedad, teleología, epigénesis y evolución; matrices conceptuales que conforman una racionalidad diferente a la racionalidad mecanicista predominante en la Física. El pensamiento sistémico es siempre pensamiento procesual. La Filosofía del proceso es un buen instrumento intelectual para la comprensión del viviente. Ninguna realidad es un hecho estático; debemos pasar de la metafísica de substancia (ser a la metafísica del devenir. Las propiedades emergentes surgen a un cierto nivel de complejidad. La explicación del sistema no se encuentra en los componentes básicos (análisis, sino en la organización jerárquica del mismo como una unidad, que posee una finalidad, un «télos». El genoma es el programa que fundamenta la estructura y comportamiento del organismo, que se desarrolla epigenéticamente. Los organismos vivos son sistemas abiertos en continuo intercambio con el medio de materia, energía e información. La célula es la unidad de análisis elemental de los vivientes, tanto microorganismos como vegetales o animales. Toda célula es una unidad dinámica y se encuentra siempre en una fase del proceso de división celular. El tiempo es una categoría esencial para la comprensión de todo organismo vivo; contemplada la serie de los vivientes a grandes escalas de tiempo, nos lleva a la afirmación de que vivir es evolucionar y de que nada en Biología tiene sentido sino es a la luz de la evolución.

  16. Steel story founded on coal

    Energy Technology Data Exchange (ETDEWEB)

    1977-01-01

    Paper reports on an iron and steel plant in New Zealand which uses non-coking subbituminuous coal to produce the sponge iron. The transport of the ironsand and the coal to the site and the operation of the kiln in which the ironsand is reduced by the coal is described.

  17. Metadynamic recrystallization in C steels

    Indian Academy of Sciences (India)

    Metadynamic recrystallization has been investigated in three plain carbon steels (ENIA, EN2 and EN24) through the use of hot interrupted compression tests on a wedge plastometer. Holding time was 0.5 s between passes. Strain rates of 0.05 and 0.12/s and small strain increments of 3, 5 and 7% were employed.

  18. Corrosion of austenitic stainless steel

    Energy Technology Data Exchange (ETDEWEB)

    Silva, M C.M. [Instituto Nacional de Tecnologia, Rio de Janeiro (Brazil)

    1977-01-01

    Types of corrosion observed in a heat exchanger pipe and on a support of still of molasses fermented wort, both in austenitic stainless steel, are focused. Not only are the causes which might have had any kind of influence on them examined, but also the measures adopted in order to avoid and lessen its occurence.

  19. Fatigue Strength of Weathering Steel

    Czech Academy of Sciences Publication Activity Database

    Kunz, Ludvík; Lukáš, Petr; Klusák, Jan

    2012-01-01

    Roč. 18, č. 1 (2012), s. 18-22 ISSN 1392-1320 Grant - others:GA MPO(CZ) FT/TA5/076 Institutional support: RVO:68081723 Keywords : fatigue of weathering steel * corrosion pits * fatigue notch factor Subject RIV: JL - Materials Fatigue, Friction Mechanics Impact factor: 0.522, year: 2012

  20. Argon solubility in liquid steel

    NARCIS (Netherlands)

    Boom, R; Dankert, O; Van Veen, A; Kamperman, AA

    2000-01-01

    Experiments have been performed to establish the solubility of argon in liquid interstitial-free steel. The solubility appears to be lower than 0.1 at ppb, The results are in line with argon solubilities reported in the literature on liquid iron. Semiempirical theories and calculations based on the

  1. Kinetics of borided gear steels

    Indian Academy of Sciences (India)

    ration (FeB + Fe2B) due to the high intensity stress states generally situated at the ... performed molten salt boriding of AISI D2 steel with borax (Na2B4O7) as the ... the borided layer thickness; silicon, chromium and aluminium have moderate.

  2. Development of PWR pressure vessel steels

    International Nuclear Information System (INIS)

    Druce, S.; Edwards, B.

    1982-01-01

    Requirements to be met by vessel steels for pressurized water reactors are analyzed. Chemicat composition of low-alloyed steels, mechanical properties of sheets and forgings made of these steels and changes in the composition and properties over the wall thickness of the reactor vessel are presented. Problems of the vessel manufacturing including welding and heat treatment processes of sheets and forgings are considered. Special attention is paid to steel embrittlement during vessel fabrication and operation (radiation embrittlement, thermal embrittlement). The role of non-metal inclusions and their effect on anisotropy of fracture toughness is discussed. Possible developments of vessel steels and procedures for producing reactor vessels are reviewed

  3. Development of PWR pressure vessel steels

    Energy Technology Data Exchange (ETDEWEB)

    Druce, S.; Edwards, B.

    1982-01-01

    Requirements to be met by vessel steels for pressurized water reactors are analyzed. Chemicat composition of low-alloyed steels, mechanical properties of sheets and forgings made of these steels and changes in the composition and properties over the wall thickness of the reactor vessel are presented. Problems of the vessel manufacturing including welding and heat treatment processes of sheets and forgings are considered. Special attention is paid to steel embrittlement during vessel fabrication and operation (radiation embrittlement, thermal embrittlement). The role of non-metal inclusions and their effect on anisotropy of fracture toughness is discussed. Possible developments of vessel steels and procedures for producing reactor vessels are reviewed.

  4. High - speed steel for precise cased tools

    International Nuclear Information System (INIS)

    Karwiarz, J.; Mazur, A.

    2001-01-01

    The test results of high-vanadium high - speed steel (SWV9) for precise casted tools are presented. The face -milling cutters of NFCa80A type have been tested in industrial operating conditions. An average life - time of SWV9 steel tools was 3-10 times longer compare to the conventional high - speed milling cutters. Metallography of SWB9 precise casted steel revealed beneficial for tool properties distribution of primary vanadium carbides in the steel matrix. Presented results should be a good argument for wide application of high - vanadium high - speed steel for precise casted tools. (author)

  5. Certified quality management according to DIN ISO 9001 in a radiology department at a university hospital. Measurable changes in academic quality indicators?; Qualitaetsmanagement nach DIN ISO 9001 an einer radiologischen Universitaetsklinik. Messbare Veraenderungen der universitaeren Kennzahlen nach der Zertifizierung?

    Energy Technology Data Exchange (ETDEWEB)

    Lorenzen, Joern; Habermann, C.; Weber, C.; Adam, G.; Koops, A. [Diagnostikzentrum, Klinik und Poliklinik fuer Diagnostische und Interventionelle Radiologie, Universitaetsklinikum Hamburg-Eppendorf (Germany); Utler, C. [Geschaeftsbereich Qualitaetsmanagement, Universitaetsklinikum Hamburg-Eppendorf (Germany); Grzyska, U. [Diagnostikzentrum, Klinik und Poliklinik fuer Neuroradiologische Diagnostik und Intervention, Universitaetsklinikum Hamburg-Eppendorf (Germany)

    2009-10-15

    Purpose: to evaluate the changes in academic quality indicators after implementation of a quality management system according to DIN ISO 9001:2000. Materials and methods: after implementation and certification of a quality management system, the actual state based on quality indicators from the fields of student teaching, research, continuing education and the satisfaction of referring physician was determined. After implementation of an action plan for the individual areas, the temporal changes in the ratios were documented in the follow-up. Results: the evaluation of teaching performance obtained by questionnaire among the students of the radiology course showed a steady increase in satisfaction (mean value 2003: 2.7; 2007: 3.9). In the field of research an increase in scientific output was achieved based on the number of an internal publication score (2002: 99 points; 2006: 509). Repeated opinion surveys among our referring physicians found improvements in indicators for the appointment of investigations, consulting service and waiting times for the investigation, while the waiting times for internal transport service did not improve. Exemplary measurements of the success of the advanced training of the staff demonstrated the need for continuing education for quality improvement. Conclusion: the evaluation of quality indicators showed over time a measurable positive impact on processes of a radiological Univ. Hospital after implementation of a QM system according to DIN ISO 9001:2000. (orig.)

  6. ¿Existen dinámicas regionales que generen pobreza?

    Directory of Open Access Journals (Sweden)

    2002-01-01

    como ventajosas, tales como los niveles bajos de fecundidad. Este artículo plantea la hipótesis de la existencia de dinámicas regionales -vinculadas con políticas y mercados nacionales y mundiales- en las que la población se involucra a través de sus redes, las cuales relacionan territorios muy distintos entre sí: ciudades y campos, alturas y valles. Por lo tanto, los hogares pobres no lo son solamente como resultado de sus propias características o de las de su lugar de residencia principal, sino también porque estas dinámicas de mayor amplitud no tienen siempre, posiblemente debido al centralismo, efectos virtuosos e incluso pueden generar efectos perversos como la poca escolarización de los jóvenes. In 2001, for first time, the Peruvian National Institute of Statistics and Informatics elaborated an indicator of “monetary poverty”, with representative values at a departmental level. This indicator no longer evaluates the existence of services and infrastructures in the places of main residence of households, nor their characteristics and those of the individuals who make them up, but their capacity for generating income. Maps made on this basis are surprising. The North Coast, for instance, appears as quite “poor” despite of features generally considered as favorable, such as low fecundity rates. In this article, I suggest the existence of regional dynamics -connected to national and global policies and markets- in which people participate through their own networks linking very different territories -cities and countryside, highlands and lowlands-. Hence, poor households are poor not only because of characteristics of their own or of their main place of residence, but also because these regional dynamics do not always have -perhaps due to centralism- virtuous effects and can even generate perverse ones, like low school attendance rates among young people.

  7. Study on cementitious properties of steel slag

    Directory of Open Access Journals (Sweden)

    Zhu G.

    2013-01-01

    Full Text Available The converter steel slag chemical and mineral components in China’s main steel plants have been analysed in the present paper. The electronic microscope, energy spectrum analysis, X-ray diffraction analysis confirmed the main mineral compositions in the converter slag. Converter slag of different components were grounded to obtain a powder with specific surface area over 400m2/kg, making them to take place some part of the cement in the concrete as the admixture and carry out the standard tests. The results indicate that the converter slag can be used as cementitious materials for construction. Furthermore, physical mechanic and durability tests on the concrete that certain amount of cement be substituted by converter steel slag powder from different steel plants are carried out, the results show that the concrete with partial substitution of steel slag powder has the advantages of higher later period strength, better frost resistance, good wear resistance and lower hydration heat, etc. This study can be used as the technical basis for “Steel Slag Powder Used For Cement And Concrete”, “Steel Slag Portland Cement”, “Low Heat Portland Steel Slag Cement”, “Steel Slag Road Cement” in China, as well as a driving force to the works of steel slag utilization with high-value addition, circular economy, energy conservation and discharge reduction in the iron and steel industry.

  8. Corrosion behavior of 2205 duplex stainless steel.

    Science.gov (United States)

    Platt, J A; Guzman, A; Zuccari, A; Thornburg, D W; Rhodes, B F; Oshida, Y; Moore, B K

    1997-07-01

    The corrosion of 2205 duplex stainless steel was compared with that of AISI type 316L stainless steel. The 2205 stainless steel is a potential orthodontic bracket material with low nickel content (4 to 6 wt%), whereas the 316L stainless steel (nickel content: 10 to 14 wt%) is a currently used bracket material. Both stainless steels were subjected to electrochemical and immersion (crevice) corrosion tests in 37 degrees C, 0.9 wt% sodium chloride solution. Electrochemical testing indicates that 2205 has a longer passivation range than 316L. The corrosion rate of 2205 was 0.416 MPY (milli-inch per year), whereas 316L exhibited 0.647 MPY. When 2205 was coupled to 316L with equal surface area ratio, the corrosion rate of 2205 reduced to 0.260 MPY, indicating that 316L stainless steel behaved like a sacrificial anode. When 316L is coupled with NiTi, TMA, or stainless steel arch wire and was subjected to the immersion corrosion test, it was found that 316L suffered from crevice corrosion. On the other hand, 2205 stainless steel did not show any localized crevice corrosion, although the surface of 2205 was covered with corrosion products, formed when coupled to NiTi and stainless steel wires. This study indicates that considering corrosion resistance, 2205 duplex stainless steel is an improved alternative to 316L for orthodontic bracket fabrication when used in conjunction with titanium, its alloys, or stainless steel arch wires.

  9. STEFINS: a steel freezing integral simulation program

    International Nuclear Information System (INIS)

    Frank, M.V.

    1980-09-01

    STEFINS (STEel Freezing INtegral Simulation) is a computer program for the calculation of the rate of solidification of molten steel on solid steel. Such computations arize when investigating core melt accidents in fast reactors. In principle this problem involves a coupled two-dimensional thermal and hydraulic approach. However, by physically reasonable assumptions a decoupled approach has been developed. The transient solidification of molten steel on a cold wall is solved in the direction normal to the molten steel flow and independent from the solution for the molten steel temperature and Nusselt number along the direction of flow. The solutions to the applicable energy equations have been programmed in cylindrical and slab geometries. Internal gamma heating of steel is included

  10. Irradiation embrittlement of pressure vessel steels

    International Nuclear Information System (INIS)

    Brumovsky, M.; Vacek, M.

    1975-01-01

    A Standard Research Programme on Irradiation Embrittlement of Pressure Vessel Steels was approved by the Coordinating Meeting on the 12th May 1972 at the Working Group on Engineering Aspects of Irradiation Embrittlement of Pressure Vessel Steels. This Working Group was set up by the International Atomic Energy Agency in Vienna. Seven countries with their research institutes agreed on doing irradiation experiments according to the approved programme on steel A533 B from the U.S. HSST Programme. The Czechoslovak contribution covering tensile and impact testing of non-irradiated steel and steel irradiated at 280degC to 1.3 x 10 23 n/m 2 (E above 1 MeV) is presented in this report. As an additional part the same set of experiments was carried out on two additional steels - A 542 and A 543, made in SKODA Works for comparison of their irradiation embrittlement and hardening with A533 B steel. (author)

  11. Procedures for the selection of stopping power ratios for electron beams: Comparison of IAEA TRS procedures and of DIN procedures with Monte Carlo results

    International Nuclear Information System (INIS)

    Roos, M.; Christ, G.

    2000-01-01

    In the International Code of Practice IAEA TRS-381 the stopping power ratios water/air are selected according to the half-value depth and the depth of measurement. In the German Standard DIN 6800-2 a different procedure is recommended, which, in addition, takes the practical electron range into account; the stopping power data for monoenergetic beams from IAEA TRS-381 are used. Both procedures are compared with recent Monte Carlo calculations carried out for various beams of clinical accelerators. It is found that the DIN procedure shows a slightly better agreement. In addition, the stopping power ratios in IAEA TRS-381 are compared with those in DIN 6800-2 for the reference conditions of the beams from the PTB linac; the maximum deviation is not larger than 0.6%. (author)

  12. Gaisma un krāsa sabiedriskās ēdināšanas telpās

    OpenAIRE

    Cvetkova, Diāna

    2015-01-01

    Diplomdarbā „Gaisma un krāsa sabiedriskās ēdināšanas telpās” autore analizē informāciju par apgaismojuma un krāsas lomām sabiedriskās ēdināšanas telpās. Labākam priekšstatam autore detāli apraksta to, kā apgaismojums un krāsa var izmainīt telpu un ietekmēt cilvēka psiholoģisko stāvokli un noskaņojumu, kā arī, kā noteiktas krasas apgaismojums var izmainīt ēdiena krāsu, tādējādi ietekmējot mūsu ēstgribu. Empiriskā daļā autore analizē interjerus kafejnīcās unrestorānos, kas atrodas Rīgas pi...

  13. Los modelos de organización y dinámicas espaciales metropolitanas en Andalucía

    Directory of Open Access Journals (Sweden)

    José Mª Feria Toribio

    2015-01-01

    Full Text Available Este artículo aborda dos dimensiones relevantes de la nueva configuración de la ciudad en Andalucía.Al igual que en todos los países de su entorno, esta nueva configuración es metropolitanatanto en el plano formal como en el funcional, lo que significa que supera nítidamente los límitesfísicos y administrativos de la ciudad tradicional, para abarcar territorios y redes de asentamientoscada vez más amplios. En ese sentido, aquí se centrará el análisis, en primer lugar, en el modoy disposición en el que se organizan espacialmente los diferentes componentes de la ciudad metropolitanay, en segundo lugar, en cuáles son las dinámicas de dicha ciudad tanto en su conjuntocomo en sus componentes. La diversidad y complejidad del sistema metropolitano andaluz, connueve áreas metropolitanas de diferente nivel jerárquico, permite además que este análisis nopersiga sólo caracterizar este universo urbano sino que también sirva para establecer modelos deorganización y dinámicas extensibles a cualquier otro sistema metropolitano.

  14. Influencia del medio ambiente en los materiales de construcción III. Dinámica salina

    Directory of Open Access Journals (Sweden)

    Fernández Paris, José Manuel

    1978-06-01

    Full Text Available Las sales y la humedad son los dos factores que condicionan las alteraciones de los materiales de construcción. Los citados materiales, bien de por sí —piedras y ladrillos—, bien una vez endurecidos —morteros y hormigones—, están estructurados por partículas sólidas granulares, separadas por un sistema poroso, que constituye el medio -dinámico para el transporte de las disoluciones salinas procedentes del medio ambiente. La motilidad de las sales a través de la red de poros es función de tres variables físicoclimáticas: temperatura, humedad y condiciones de aireación. La dinámica salina se efectúa mediante procesos de difusión, unas veces de naturaleza química: difusión iónica, otras de naturaleza física: difusión capilar.

  15. Control de Robots Móviles con Incertidumbres Dinámicas usando Redes de Base Radial

    Directory of Open Access Journals (Sweden)

    Francisco G. Rossomando

    2010-10-01

    Full Text Available Resumen: En este trabajo se presenta un control de seguimiento de trayectorias de robots móviles. La estructura de control propuesta combina una linealización por realimentación basada en el modelo cinemático nominal, y una red neuronal directa para el control dinámico adaptable. La dinámica del robot es aprendida por una red neuronal basada en funciones de base radial (RN-FBR en un lazo de realimentación adaptable, ajustando el peso y las funciones de base radial. Se muestra un análisis de estabilidad del sistema de neuro-control adaptable. Se comprueba que los errores de control están limitados en función del error de aproximación de la RN-FBR. El funcionamiento del controlador también se verifica experimentalmente. Palabras clave: robot móvil, control no lineal, redes neuronales, control adaptable, funciones de base radial

  16. Clasificación y detección de fallas en Sistemas Dinámicos

    Directory of Open Access Journals (Sweden)

    Javier Hernando Pardo Mayorga

    2006-05-01

    Full Text Available En los sistemas dinámicos se pueden presentar fallas en cualquier instante de tiempo, estas fallas pueden ser generadas en gran cantidad de casos por la variación de uno o más parámetros de la planta o del sistema dinámico. En este trabajo se propone la detección de fallas en una planta no lineal de dos tanques acoplados uno con área constante y otro variable con la altura esto basado en observadores adaptivos, sustentado con clasificación LAMDA y análisis de componentes principales. Se presenta la aplicación del algoritmo en un sistema no lineal, control del nivel en un sistema de tanques acoplados, así como el análisis de resultados conclusiones y perspectivas futuras./ In the dynamic systems a fail can occur in any moment, the fail can be present for variations in one or more parameter of the dynamic system. This paper present a fail detection in a non linear system compose by two tanks in parallel one with constant transversal area and the other one with variable area, the work is develop with adaptive observers and LAMDA classification. The application on this paper is in a non linear system, the level control in the two tank system.

  17. Dinámica de la producción porcina en México de 1980 a 2008

    Directory of Open Access Journals (Sweden)

    Encarnación Ernesto Bobadilla Soto

    2010-01-01

    Full Text Available El objetivo fue evaluar la dinámica de la producción porcina nacional e identificar los puntos críticos, los cambios y ajustes, de 1980 a 2008. Se analizó el país en su conjunto, las cinco regiones socio-económicas y los Estados que lo conforman. Los datos fueron obtenidos de SAGARPA, Banco de México y de la Secretaria de Economía, y se evaluaron indicadores de crecimiento, tendencia y precios reales. La política económica y financiera afectó la capacidad de pago de los productores. Los inventarios disminuyeron y modificó la dinámica del sector de forma negativa. La apertura comercial modificó negativamente la porcicultura mexicana, ya que la mayoría de los productos cárnicos y despojos comestibles de porcino importados, fueron introducidos al país con precios por debajo de los costos de producción mexicanos. La política de sacrificio favoreció únicamente a un sector. La producción de carne se desarrolló principalmente en los estados de Jalisco, Sonora, Guanajuato, Michoacán y los estados con mayor crecimiento fueron Yucatán, Puebla, Sonora, Guanajuato, con mayor decremento el Estado de México, Michoacán y Jalisco.

  18. DInSAR-Based Detection of Land Subsidence and Correlation with Groundwater Depletion in Konya Plain, Turkey

    Directory of Open Access Journals (Sweden)

    Fabiana Caló

    2017-01-01

    Full Text Available In areas where groundwater overexploitation occurs, land subsidence triggered by aquifer compaction is observed, resulting in high socio-economic impacts for the affected communities. In this paper, we focus on the Konya region, one of the leading economic centers in the agricultural and industrial sectors in Turkey. We present a multi-source data approach aimed at investigating the complex and fragile environment of this area which is heavily affected by groundwater drawdown and ground subsidence. In particular, in order to analyze the spatial and temporal pattern of the subsidence process we use the Small BAseline Subset DInSAR technique to process two datasets of ENVISAT SAR images spanning the 2002–2010 period. The produced ground deformation maps and associated time-series allow us to detect a wide land subsidence extending for about 1200 km2 and measure vertical displacements reaching up to 10 cm in the observed time interval. DInSAR results, complemented with climatic, stratigraphic and piezometric data as well as with land-cover changes information, allow us to give more insights on the impact of climate changes and human activities on groundwater resources depletion and land subsidence.

  19. Dinámica de los componentes demográficos en Baja California, durante el periodo 1985-1990

    Directory of Open Access Journals (Sweden)

    Gabriel Estrella Valenzuela

    1991-09-01

    Full Text Available En este trabajo se identifican los rangos predominantes en la dinámica de los componentes demográficos del estado de Baja California y sus municipios, durante el período 1985-1990. Para ello, se utilizan y combinan datos de estadísticas vitales, censales y de las Encuestas Demográficas de Baja California de 1986 y 1990. A partir del análisis de la mortalidad y la fecundidad, se logra determinar una tendencia de estabilidad en el componente natural de la dinámica demográfica del estado, con variaciones marginales a nivel municipal. En el rubro de crecimiento social, sin embargo, se observa un notable y claro incremento en la movilidad de la población que se sustenta en dos componentes: un incremento en la tasa de emigración desde el estado en su conjunto y una más elevada y consistente tendencia al incremento en las tasas de inmigración hacia Baja California, que revierte la tendencia decreciente del peso del crecimiento social en la entidad

  20. Sobre a dinâmica da ideologia à luz da interpretação lukácsiana

    Directory of Open Access Journals (Sweden)

    Nara Roberta Silva

    2015-06-01

    Full Text Available Reconhecendo que o conceito de ideologia apresenta uma gama de significados, acepções e definições, o artigo procura debatê-lo dentro da leitura de György Lukács – considerando que não há uma concepção de ideologia sistematizada pelo próprio Karl Marx. Com isso, parte-se da relação não dicotômica entre realidade objetiva e subjetividade visualizada através do trabalho, cerne da teoria marxiana, e define-se ideologia a partir de sua função social de intervir nos conflitos, impasses, questões etc. de cunho também social. Em decorrência, considerando seu caráter de consciência eminentemente prática, exploram-se então aspectos concernentes à complexa dinâmica da ideologia, que possibilitam compreender sua atuação e sua influência em meio a uma dada formação social – dinâmica esta sintetizada no que optamos por chamar de linguagem da evidência.

  1. La dinámica pendular de la regionalización de la universidad en Argentina

    Directory of Open Access Journals (Sweden)

    Claudio Antonio Rama Vitale

    2014-11-01

    Full Text Available El artículo analiza la dinámica de construcción del sistema de educación superior pública en Argentina atendiendo a las dimensiones de su regionalización y explorando  las tensiones regionales alrededor de sus construcción. Visualiza bajos niveles de diferenciación institucional y de competencia institucional, pero indica las complejidades de esa diferenciación regional, el carácter no resuelto políticamente de tales procesos, y como su dinámica ha estado asociada a procesos político ideológicos. La regionalización de la educación superior muestra múltiples expresiones, pero donde la dominante ha sido la tensión entre la construcción de  espacios de poder y de desarrollo académico a escala local frente al objetivo desde los ámbitos nacionales de regular nacionalmente la educación superior.  

  2. Processos globais e mercado de trabalho: novas dinâmicas no setor automotivo no Brasil - anos 2000

    Directory of Open Access Journals (Sweden)

    Garcia, Sandro Ruduit

    2007-01-01

    Full Text Available O artigo tenta identificar novas dinâmicas no mercado de trabalho, face aos processos globais, a partir do que vem ocorrendo no setor automotivo brasileiro nos anos 2000, focando particularmente o caso do pólo de Gravataí (RS. O argumento central da análise é de que a constituição de processos globais promove novas dinâmicas em mercados de trabalho regionais. A abertura de mercados de produtos, as composições entre capitais nacionais e estrangeiros e os investimentos em novas plantas industriais expressam processos globais que poderiam criar novas atividades e funções produtivas, empresas e empregos, assim como estimular capacidades e conhecimentos. Por outro lado, a competitividade, instabilidade e interdependência do sistema global reforçariam a seletividade social nos mercados de trabalho regionais, constituindo novos riscos e ansiedades para segmentos econômicos e sociais vulneráveis. Isso tenderia a mobilizar instituições no esforço de tentar reparar distorções face à nova complexidade do mercado de trabalho

  3. A dinâmica cultural contemporânea e a revalorização da vida.

    Directory of Open Access Journals (Sweden)

    Edmilson Felipe da Silva

    2014-03-01

    Full Text Available Este trabalho tem por objeto analisar a dinâmica cultural contemporânea, profundamente marcada pela relação espaço-temporal, bem como pelas novas articulações entre fluxos identitários e tecnologia. Parte-se do pressuposto de que a temporalidade em que vivemos apresenta uma volatilidade entre as mercadorias, bem como evidencia novas formas de sociabilidade que redefinem a vida dos indivíduos, independente de suas respectivas faixas etárias. No contexto atual de globalização em que fronteiras cada vez menos nítidas se apresentam, no que diz respeito à demarcação de limites físicos e territoriais estanques, podemos estabelecer que a dinâmica da cultura ganha outros conceitos e articulações que vão além das tradições, bem como dos pertencimentos. Neste cenário, o artigo pretende elaborar a crítica ao modelo econômico que fundamenta um ideário de progresso (crescimento, mas não dá conta das inúmeras outras emergências que surgem em outros campos de reflexão como ecológico, cultural, informacional.  

  4. Dinámica ambiental y económica en la localidad de Puente Aranda en Bogotá

    Directory of Open Access Journals (Sweden)

    Carlos Fernando Parra Moreno

    2014-01-01

    Full Text Available Este documento muestra los resultados parciales de la investigación “Responsabilidad social y ambiental de la industria manufacturera en la localidad de Puente Aranda en la ciudad de Bogotá como alternativa al desarrollo humano integral sustentable”, realizados dentro del marco de trabajo del grupo de investigación Girsa. El estudio se basó en el análisis de la dinámica poblacional, ambiental y económica de la dicha localidad, a través de la metodología de la matriz de Vester. Con este instrumento se logró identificar las relaciones e interacciones dinámicas de todos los actores locales en el tiempo y en el espacio. Dentro de los problemas críticos que se encontraron en la localidad de Puente Aranda se encontró el agotamiento de fuentes hídricas, poca conciencia y educación ambiental de la población, una mala disposición de basuras, la no disponibilidad de servicios públicos para los nuevos asentamientos y altos niveles de emisión de partículas contaminantes.

  5. [Establishing a quality management system according to DIN EN ISO 9001:2000 in an academic radiological department].

    Science.gov (United States)

    Adam, G; Lorenzen, J; Krupski, G; Schackmann, R; Steiner, P; Reuter, H; Paschen, U

    2003-02-01

    Establishing a quality management (QM) system according the guidelines of DIN EN ISO 9001:2000 in an academic radiological department. To fulfill the requirements of an academic radiological department a quality management system according the guidelines of DIN EN ISO 9001 : 2000 has been established within one year. All important educational, research and patient care issues have been discussed in plenary sessions of all employees of the department twice a week. All core processes of the department have been documented as process instructions and standard operation procedures. Supported by the staff unit "quality assurance" of the university hospital, the QM system has been established during one year. Assisted by all parties of the department, obliging regulations have been established which are well accepted in the daily routine clinical work but also in research and education. The implementation of the QM system caused an additional work load. However, spreading the work load by a consequent responsibility assignment, it could be reduced effectively. The implementation of a QM system within the daily routine work of an academic radiological department is feasible. It allows the installation of generally accepted rules which regulate the principal tasks of research and education, and patient care.

  6. La dinámica del subdesarrollo y su relación con el deterioro ambiental

    Directory of Open Access Journals (Sweden)

    Carlos Dionisio Pérez-Blanco

    2012-01-01

    Full Text Available ¿Son los países desarrollados los culpables del deterioro ambiental?, y por tanto, ¿tienen los países subdesarrollados derecho a contaminar más? En este artículo se rebate esta tesis para mostrar que una dinámica de crecimiento que conduce al desarrollo de un territorio de renta baja debe ser por necesidad sostenible, si este país no desea liquidar sus posibilidades de desarrollo. Partiendo de las principales aportaciones teóricas de la economía del desarrollo, el artículo defiende la reciprocidad entre desarrollo y calidad ambiental. Se señala la dificultad que tienen los países subdesarrollados para abandonar un equilibrio de bajo nivel, y lo que esto implica en su riqueza (en concreto su capital ambiental, que es la que en última instancia determina su capacidad de generar renta en el futuro. Se requiere por tanto una comprensión profunda de la dinámica del subdesarrollo para frenar el deterioro ambiental.

  7. Caracterización dinámica de los cambios microestructurales en barras de aceros dúplex SAF 2205 utilizando la dimensión de información

    Directory of Open Access Journals (Sweden)

    Rodríguez, Edda

    2014-03-01

    Full Text Available This study evaluates the ultrasonic signals behavior of a duplex stainless steel SAF 2205 (UNS S31803 after aging treatments at 875 and 950 °C. The first treatment promotes the precipitation of the sigma phase and the second, its dissolution. The microstructural evaluation was carried out by optical microscopy. The results showed an increase of the sigma phase fraction and the secondary austenite with the time of aging treatment at 875 °C. On the other hand, increasing the time of treatment at 950 °C promotes a reduction of the sigma phase and the corresponding increase of the ferrite phase fraction. The study proposed to evaluate in the dynamical system field the influence of microstructural phases in the signals behavior and their dependence on the energy losses occurring in system during heat treatment, by deterministic chaos theory. To accomplish characterization, algorithm employs the representation of dynamic phase space and the information dimension estimate. The results show a higher correlation between the information dimension and the attenuation coefficient in comparison with the phase fractions. However, the efficiency of this type of study will depend on the frequency selected for the evaluation of the material.En el presente estudio se evalúa el comportamiento dinámico de las señales ultrasónicas de muestras de acero dúplex SAF 2205 (UNS31803, sometidos a tratamientos de envejecimiento a 875 y 950 °C. En el primer tratamiento se promueve la precipitación de la fase sigma y en el segundo su disolución. Los resultados obtenidos por microscopía óptica indican que la cantidad relativa de la fase sigma aumenta progresivamente con el tiempo de envejecimiento a 875 °C, observándose la transformación de la fase ferrita en fase sigma y en austenita secundaria. Por otra parte, a medida que se aumenta el tiempo de tratamiento a 950 °C, se observa una reducción del porcentaje de fase sigma y un aumento de la fase ferr

  8. Earthquake response of steel braces and braced steel frames

    OpenAIRE

    Gan, Wenshui

    1996-01-01

    This thesis consists of three parts. Chapter 2 deals with the dynamic buckling behavior of steel braces under cyclic axial end displacement. Braces under such a loading condition belong to a class of "acceleration magnifying" structural components, in which a small motion at the loading points can cause large internal acceleration and inertia. This member-level inertia is frequently ignored in current studies of braces and braced structures. This chapter shows that, under certain conditions, ...

  9. Herramienta para la enseñanza de las ecuaciones de Lagrange basada en la simulación de sistemas dinámicos

    OpenAIRE

    Bravo M., D. A.; Rengifo R., C. F.

    2014-01-01

    En este trabajo se propone una herramienta para la enseñanza de la mecánica clásica, modelando sistemas dinámicos con las ecuaciones de Lagrange, a partir de la simulación en Matlab ©. Este enfoque permite a los estudiantes de ingeniería y ciencias básicas, desarrollar competencias en programación, análisis numérico, con el uso de la física como herramienta fundamental para modelar y simular sistemas dinámicos complejos, como por ejemplo: robots industriales, robots bípedos y cualquier sistem...

  10. Una aproximación metodológica para el modelamiento organizacional bajo un enfoque de dinámica de sistemas

    OpenAIRE

    Arango Serna, Martin Darío

    1997-01-01

    EI objetivo de este trabajo es elaborar unas paulas metodológicas basadas en dinámica de sistemas que permitan experimentar estrategias de cambia en las organizaciones. Es un proyecto de investigaci6n que surge ante la necesidad de involucrar en los procesos del modelamiento organizacional el pensamiento sistémico conjuntamente con la dinámica de sistemas, como una herramienta ágil para la toma de decisiones en las políticas gerenciales del mundo empresarial moderno. EI pensamiento de...

  11. Del modelo extractivista a las dinámicas de desarrollo local en contextos de conflicto: distrito minero litoral pacífico (2008-2012)

    OpenAIRE

    Pardo Durán, Joan Sebastián

    2016-01-01

    La presente investigación tiene como objetivo principal, analizar las dinámicas de desarrollo local del distrito minero Litoral Pacífico durante el periodo 2008-2012 a partir del modelo extractivista, con el fin de demostrar que, a pesar del auge minero durante estos gobiernos, el crecimiento de la actividad y la entrada de capital a estos municipios, el desarrollo local es escaso ante las dinámicas del conflicto armado interno y el abandono estatal que ha existido por excelencia en esta zona...

  12. Dinámica no lineal en la motivación en el trabajo: propuesta de un modelo y resultados preliminares

    OpenAIRE

    Navarro Cid, José; Quijano de Arana, Santiago D. de

    2003-01-01

    Muchos especialistas estarían de acuerdo en que la motivación en el trabajo debe entenderse como un proceso dinámico. Sin embargo, son pocas las investigaciones que se han interesado por la descripción y explicación de dicha dinámica motivacional. Este artículo propone un modelo complejo de motivación en el trabajo que integra tres variables clásicas en la literatura: motivos, autoeficacia e instrumentalidad. El modelo incorpora los cambios que se producen en la motivación a lo largo del tiem...

  13. Educação para o uso da internet - uma abordagem através das dinâmicas de grupo

    OpenAIRE

    Tinoco, Rui

    2013-01-01

    Coletânea de dinâmicas de grupo que aborda o tema de um uso saudável da interenet. Através de diversas perspetivas e temas aborda-se várias áreas e práticas usuais. As dinâmicas de grupo destinam-se não apenas aos mais novos mas também a professores e educadores em geral. A obra pretende assim ser uma ferramenta para todo aquele que pretenda estudar e intervir sobre a temática do uso saudável da internet.

  14. Gestión de la cadena de suministros desde la dinámica de sistemas. Aproximación al mejoramiento de la toma de decisiones

    OpenAIRE

    Brijaldo Oliveros, Felipe Orlando

    2015-01-01

    El objetivo de este trabajo es hacer un estudio sobre la cadena de suministros en organizaciones empresariales desde la Dinámica de Sistemas y como esta puede aportar al desempeño y el control de las cadenas de suministros. Se buscará Abordar el cocimiento sobre tres perspectivas de Supply Chain y su relación con la dinámica de sistemas. También se buscará identificar los tipos de integración en las actividades de la gestión en la cadena de suministros y sus horizontes de planeación. Por últi...

  15. Advanced cold rolled steels for automotive applications

    Energy Technology Data Exchange (ETDEWEB)

    Hofmann, Harald; Mattissen, Dorothea; Schaumann, Thomas Wilhelm [ThyssenKrupp Steel AG, Center of Materials Excellence, Dortmund (Germany)

    2009-01-15

    Advanced high-strength steels offer a great potential for the further development of automobile bodies-in-white due to their combined mechanical properties of high formability and strength. They represent the first choice in material selection for strength and crash-relevant parts with challenging geometries. The intensive development of multiphase steels by ThyssenKrupp Steel has led to hot dip galvanizing concepts with an outstanding forming potential. Hot rolled, hot dip galvanized complex-phase steels are currently produced in addition to cold rolled dual phase (DP) and retained austenite (RA) or transformation induced plasticity (TRIP) steels. New continuously annealed grades of steel are being developed with tensile strength levels of up to 1000 MPa in combination with sufficient ductility for the high demands of structural automobile components. These steels make use of the classic advantages of microalloying as well as the principles of DP steels and RA / TRIP steels. Further improvement of properties will be reached by the new class of high manganese alloyed steels. (orig.)

  16. On high temperature strength of carbon steels

    International Nuclear Information System (INIS)

    Ichinose, Hiroyuki; Tamura, Manabu; Kanero, Takahiro; Ihara, Yoshihito

    1977-01-01

    In the steels for high temperature use, the oxidation resistance is regarded as important, but carbon steels show enough oxidation resistance to be used continuously at the temperature up to 500 deg. C if the strength is left out of consideration, and up to 450 deg. C even when the strength is taken into account. Moreover, the production is easy, the workability and weldability are good, and the price is cheap in carbon steels as compared with alloy steels. In the boilers for large thermal power stations, 0.15-0.30% C steels are used for reheater tubes, main feed water tubes, steam headers, wall water tubes, economizer tubes, bypass pipings and others, and they account for 70% of all steel materials used for the boilers of 350 MW class and 30% in 1000 MW class. The JIS standard for the carbon steels for high temperature use and the related standards in foreign countries are shown. The high temperature strength of carbon steels changes according to the trace elements, melting and heat treatment as well as the main compositions of C, Si and Mn. Al and N affect the high temperature strength largely. The characteristics of carbon steels after the heating for hours, the factors controlling the microstructure and high temperature strength, and the measures to improve the high temperature strength of carbon steels are explained. (Kako, I.)

  17. Existing Steel Railway Bridges Evaluation

    Science.gov (United States)

    Vičan, Josef; Gocál, Jozef; Odrobiňák, Jaroslav; Koteš, Peter

    2016-12-01

    The article describes general principles and basis of evaluation of existing railway bridges based on the concept of load-carrying capacity determination. Compared to the design of a new bridge, the modified reliability level for existing bridges evaluation should be considered due to implementation of the additional data related to bridge condition and behaviour obtained from regular inspections. Based on those data respecting the bridge remaining lifetime, a modification of partial safety factors for actions and materials could be respected in the bridge evaluation process. A great attention is also paid to the specific problems of determination of load-caring capacity of steel railway bridges in service. Recommendation for global analysis and methodology for existing steel bridge superstructure load-carrying capacity determination are described too.

  18. Existing Steel Railway Bridges Evaluation

    Directory of Open Access Journals (Sweden)

    Vičan Josef

    2016-12-01

    Full Text Available The article describes general principles and basis of evaluation of existing railway bridges based on the concept of load-carrying capacity determination. Compared to the design of a new bridge, the modified reliability level for existing bridges evaluation should be considered due to implementation of the additional data related to bridge condition and behaviour obtained from regular inspections. Based on those data respecting the bridge remaining lifetime, a modification of partial safety factors for actions and materials could be respected in the bridge evaluation process. A great attention is also paid to the specific problems of determination of load-caring capacity of steel railway bridges in service. Recommendation for global analysis and methodology for existing steel bridge superstructure load-carrying capacity determination are described too.

  19. Bond characteristics of steel fiber and deformed reinforcing steel bar embedded in steel fiber reinforced self-compacting concrete (SFRSCC)

    Science.gov (United States)

    Aslani, Farhad; Nejadi, Shami

    2012-09-01

    Steel fiber reinforced self-compacting concrete (SFRSCC) is a relatively new composite material which congregates the benefits of the self-compacting concrete (SCC) technology with the profits derived from the fiber addition to a brittle cementitious matrix. Steel fibers improve many of the properties of SCC elements including tensile strength, ductility, toughness, energy absorption capacity, fracture toughness and cracking. Although the available research regarding the influence of steel fibers on the properties of SFRSCC is limited, this paper investigates the bond characteristics between steel fiber and SCC firstly. Based on the available experimental results, the current analytical steel fiber pullout model (Dubey 1999) is modified by considering the different SCC properties and different fiber types (smooth, hooked) and inclination. In order to take into account the effect of fiber inclination in the pullout model, apparent shear strengths ( τ ( app)) and slip coefficient ( β) are incorporated to express the variation of pullout peak load and the augmentation of peak slip as the inclined angle increases. These variables are expressed as functions of the inclined angle ( ϕ). Furthurmore, steel-concrete composite floors, reinforced concrete floors supported by columns or walls and floors on an elastic foundations belong to the category of structural elements in which the conventional steel reinforcement can be partially replaced by the use of steel fibers. When discussing deformation capacity of structural elements or civil engineering structures manufactured using SFRSCC, one must be able to describe thoroughly both the behavior of the concrete matrix reinforced with steel fibers and the interaction between this composite matrix and discrete steel reinforcement of the conventional type. However, even though the knowledge on bond behavior is essential for evaluating the overall behavior of structural components containing reinforcement and steel fibers

  20. 46 CFR 56.60-5 - Steel (High temperature applications).

    Science.gov (United States)

    2010-10-01

    ....A.) Upon prolonged exposure to temperatures above 775 °F (412 °C), the carbide phase of plain carbon steel, plain nickel-alloy steel, carbon-manganese-alloy steel, manganese-vanadium-alloy steel, and carbon-silicon steel may convert to graphite. (b) (Reproduces 124.2.B.) Upon prolonged exposure to...

  1. Steel Industry Marginal Opportunity Analysis

    Energy Technology Data Exchange (ETDEWEB)

    none,

    2005-09-01

    The Steel Industry Marginal Opportunity Analysis (PDF 347 KB) identifies opportunities for developing advanced technologies and estimates both the necessary funding and the potential payoff. This analysis determines what portion of the energy bandwidth can be captured through the adoption of state-of-the-art technology and practices. R&D opportunities for addressing the remainder of the bandwidth are characterized and plotted on a marginal opportunity curve.

  2. Nano-composite stainless steel

    Science.gov (United States)

    Dehoff, Ryan R.; Blue, Craig A.; Peter, William H.; Chen, Wei; Aprigliano, Louis F.

    2015-07-14

    A composite stainless steel composition is composed essentially of, in terms of wt. % ranges: 25 to 28 Cr; 11 to 13 Ni; 7 to 8 W; 3.5 to 4 Mo; 3 to 3.5 B; 2 to 2.5 Mn; 1 to 1.5 Si; 0.3 to 1.7 C; up to 2 O; balance Fe. The composition has an austenitic matrix phase and a particulate, crystalline dispersed phase.

  3. Steel Pickling in Challenging Conditions

    OpenAIRE

    Maanonen, Mika

    2014-01-01

    The purpose of this thesis was to collect data on the pickling procedure and parameters especially in conditions where there are limited amount of power for heating, limited water treatment possibilities and equipment to maintain pickling processes. Information about steel pickling, alternative methods and processes before and after pickling was acquired. Data on most common chemicals for pickling were acquired and compared. Cleaning efficiency, ease of use, safety, price and availability...

  4. Benchmarking in Mobarakeh Steel Company

    Directory of Open Access Journals (Sweden)

    Sasan Ghasemi

    2008-05-01

    Full Text Available Benchmarking is considered as one of the most effective ways of improving performance incompanies. Although benchmarking in business organizations is a relatively new concept and practice, ithas rapidly gained acceptance worldwide. This paper introduces the benchmarking project conducted in Esfahan’s Mobarakeh Steel Company, as the first systematic benchmarking project conducted in Iran. It aimsto share the process deployed for the benchmarking project in this company and illustrate how the projectsystematic implementation led to succes.

  5. Thermophysical properties of stainless steels

    International Nuclear Information System (INIS)

    Kim, C.S.

    1975-09-01

    Recommended values of the thermodynamic and transport properties of stainless steels Type 304L and Type 316L are given for temperatures from 300 to 3000 0 K. The properties in the solid region were obtained by extrapolating available experimental data to the melting range, while appropriate correlations were used to estimate the properties in the liquid region. The properties evaluated include the enthalpy, entropy, specific heat, vapor pressure, density, thermal expansion coefficient, thermal conductivity, thermal diffusivity, and viscosity. (9 fig, 11 tables)

  6. Benchmarking in Mobarakeh Steel Company

    OpenAIRE

    Sasan Ghasemi; Mohammad Nazemi; Mehran Nejati

    2008-01-01

    Benchmarking is considered as one of the most effective ways of improving performance in companies. Although benchmarking in business organizations is a relatively new concept and practice, it has rapidly gained acceptance worldwide. This paper introduces the benchmarking project conducted in Esfahan's Mobarakeh Steel Company, as the first systematic benchmarking project conducted in Iran. It aims to share the process deployed for the benchmarking project in this company and illustrate how th...

  7. Nickel: makes stainless steel strong

    Science.gov (United States)

    Boland, Maeve A.

    2012-01-01

    Nickel is a silvery-white metal that is used mainly to make stainless steel and other alloys stronger and better able to withstand extreme temperatures and corrosive environments. Nickel was first identified as a unique element in 1751 by Baron Axel Fredrik Cronstedt, a Swedish mineralogist and chemist. He originally called the element kupfernickel because it was found in rock that looked like copper (kupfer) ore and because miners thought that "bad spirits" (nickel) in the rock were making it difficult for them to extract copper from it. Approximately 80 percent of the primary (not recycled) nickel consumed in the United States in 2011 was used in alloys, such as stainless steel and superalloys. Because nickel increases an alloy's resistance to corrosion and its ability to withstand extreme temperatures, equipment and parts made of nickel-bearing alloys are often used in harsh environments, such as those in chemical plants, petroleum refineries, jet engines, power generation facilities, and offshore installations. Medical equipment, cookware, and cutlery are often made of stainless steel because it is easy to clean and sterilize. All U.S. circulating coins except the penny are made of alloys that contain nickel. Nickel alloys are increasingly being used in making rechargeable batteries for portable computers, power tools, and hybrid and electric vehicles. Nickel is also plated onto such items as bathroom fixtures to reduce corrosion and provide an attractive finish.

  8. Corrosion of mild steel and stainless steel by marine Vibrio sp.

    Digital Repository Service at National Institute of Oceanography (India)

    PrabhaDevi; Wagh, A.B.

    Microbially induced corrosion (MIC) of stainless steel and mild steel coupons exposed to media with and without a bacterial culture Vibrio sp. was studied using Scanning Electron Microscope (SEM). Pitting type of corrosion was noticed which was more...

  9. Preparation and characterization of 304 stainless steel/Q235 carbon steel composite material

    Science.gov (United States)

    Shen, Wenning; Feng, Lajun; Feng, Hui; Cao, Ying; Liu, Lei; Cao, Mo; Ge, Yanfeng

    The composite material of 304 stainless steel reinforced Q235 carbon steel has been prepared by modified hot-rolling process. The resulted material was characterized by scanning electron microscope, three-electrode method, fault current impact method, electrochemical potentiodynamic polarization curve measurement and electrochemical impedance spectroscopy. The results showed that metallurgical bond between the stainless steel layer and carbon steel substrate has been formed. The composite material exhibited good electrical conductivity and thermal stability. The average grounding resistance of the composite material was about 13/20 of dip galvanized steel. There has no surface crack and bubbling formed after fault current impact. The composite material led to a significant decrease in the corrosion current density in soil solution, compared with that of hot dip galvanized steel and bare carbon steel. On the basis polarization curve and EIS analyses, it can be concluded that the composite material showed improved anti-corrosion property than hot-dip galvanized steel.

  10. Semifabricate din tocătură de carne de ovină cu adaos de şrot din seminţe de nuci, dovleac, in şi struguri

    Directory of Open Access Journals (Sweden)

    Irina GRUMEZA

    2016-12-01

    Full Text Available The purpose of researches conducted in the Laboratory of Food Biotechnology of the Scientific-Practical Institute of Horticulture and Food Technology was to prepare and evaluate physico-chemical andorganoleptic properties of the semi-processed ground mutton (rolls products supplemented with walnut, pump-kin, flax and grape seed cakes (10%. The prepared semi-processed products were kept in a refrigerator at thetemperature of 0 ... + 4°C for 5 days. During 72 hours of storage in refrigeration conditions it was recorded adecrease of humidity and water-binding capacity index in roll samples. Salt and fat mass fraction changedinsignificantly and remained practically at the same level. Microbiological analyzes showed no coliform bacteria,no pathogenic bacteria, including Salmonella and sulphite reducing clostridia. Mass loss as a result of heattreatment (baking in an electric oven constituted: 9.8% (rolls with walnut seed cakes, 16.3% (pumpkin, 15.9%(grapes and 46.2% (control variant, without added cake. The best organoleptic characteristics have beenrecorded by the samples with walnut seed cake, obtaining the average score of 4.66. Rezumat. Scopul cercetărilor realizate în Laboratorul de Biotehnologii Alimentare al Institutului Ştiinţifico-Practic de Horticulturăşi Tehnologii Alimentare a fost prepararea şi evaluarea proprietăţilor fizico-chimice şiorganoleptice ale semifabricatelor din carne de ovină, îmbogăţită cu adaosuri de şrot (10% din seminţe de nuci,dovleac, in şi struguri. Semifabricatele preparate (mici au fost păstrate în frigider la 0...+40C, timp de 5zile. Peparcursul păstrării în stare refrigerată timp de 72 ore s-a constatat reducerea umidităţii şi a indicelui capacităţii delegare a apei la mostrele de mici, fracţia masică de sare şi grăsime modificându-se neesenţial şi rămânând practicla acelaşi nivel. Analizele microbiologice au arătat lipsa bacteriilor coliforme, a bacteriilor patogene

  11. Adaptation of the pressure test for borehole heat exchangers in accordance with DIN V 4279-7; Anpassen der Druckpruefung nach DIN V 4279-7 fuer Erdwaermesonden aus Polyethylen

    Energy Technology Data Exchange (ETDEWEB)

    Rohner, E.

    2005-07-01

    The goal of this project was to develop a pressure test in accordance with DIN V 4279-7 to identify possible leakages of borehole heat exchanger systems. The presented pressure test serves predominantly as quality assurance. The test shall prevent that leaking borehole heat exchangers are put into operation. Since January 1{sup st}, 2005 the test, based on this report, is integral part of the seal of approval 'Erdwaermesonde' delivered by the Association for the Promotion of Heat Pumps in Switzerland ('Foerdergemeinschaft Waermepumpen Schweiz'). The presented methodology allows accurate and fast measurements of the tightness of borehole heat exchanger systems (test duration: about 1.5 h). A measuring apparatus was developed which allows to proceed easily with the pressure test. Pressure test and measuring apparatus have been already successfully used. (author)

  12. Implementation of standards at a research institute. Storage and keeping of radioactive materials following DIN 25422; Umsetzung von Normen in einem Forschungsinstitut. Sichere Aufbewahrung und Lagerung radioaktiver Stoffe nach DIN 25422

    Energy Technology Data Exchange (ETDEWEB)

    Koeble, T.; Weinand, U. [Fraunhofer-INT, Euskirchen (Germany)

    2016-07-01

    The secure storage and keeping of radioactive materials is increasingly important especially in times of a growing threat by terrorists. Authorities and users are jointly recommended to adapt the storage and keeping of radioactive materials to increasing security requirements. Here the different possibilities to fulfil the requirements regarding fire prevention and theft prevention which in Germany are set by DIN 25422 were determined for the radioactive materials and their storage and keeping places present in a research institute. The required measures were than agreed about with the relevant authority. Difficulties which are occurring due to the demanding combination of requirements out of the areas of radiation protection, fire prevention, and theft prevention are discussed. The storage and keeping of radioactive materials especially such of high activity requires a high level of security which must be continuously adapted to rising requirements.

  13. STRUCTURA TAXONOMICĂ ŞI ECOLOGICĂ A ALGOFLOREI EDAFICE DIN SERELE SATULUI CHIŞTELNIŢA, RAIONUL TELENEŞTI

    Directory of Open Access Journals (Sweden)

    Alina TROFIM

    2016-02-01

    Full Text Available În articol sunt redate particularităţile structurale ale algoflorei edafice din serele s. Chiştelniţa. Structura taxonomică este constituită din 53 de specii şi varietăţi intraspecifice de alge, care aparţin la 31 genuri, 22 familii, 16 ordine şi 7 clase, dintre care cea mai înaltă diversitate au clasele Hormogoniophyceae – cu 16 specii şi Xanthophyceae – cu 14 specii. Carac­te­ristica ecologică a algoflorei demonstrează predominarea ecobiomorfelor P, care sunt lipsite de heterocisteşi răspân­dite printre particulele de sol sau se dezvoltă la suprafaţa lui. În algoflora solurilor au fost depistate 4 specii ce aparţin ecobio­morfei CF şi sunt azotfixatoare: Anabaena sp., Cylindrospermum licheniforme (Bory. Kütz., Nostoc linckia (Roth. Born. et Flah. şi Nostoc sp., care, în conformitate cu datele din literatura de specialitate, reprezintă tulpini de perspectivă pentru promovarea agriculturii ecologice. TAXONOMIC AND ECOLOGICAL STRUCTURE OF EDAPHICAL ALGAL FLORA FROM GREENHOUSE OF VILLAGE CHISTELNITA, DISTRICT TELENESTIIn this article are presented structural features of edaphical algal flora of greenhouses from village Chistelnita. Taxonomic structure consists of 53 species and varieties of algae belonging to 31 genera, 22 families, 16 orders and 7 classes, of which the highest diversity have Hormogoniophyceae and Xanthophyceae classes, with 16 and 14 species. Ecological characteristics of algal flora demonstrates the predominance of P ecobiomorphic, which are devoid of heterocyst and spread through the particles of ground or on the surface of it. In soils algal flora were discovered four species belonging to CF ecobiomorphic and they are nitrogen fixing: Anabaena sp., Cylindrospermum licheniforme (Bory. Kutz., Nostoc linckia (Roth. Born. et Flah. and Nostoc sp., which according to data from the literature, is promising strains for promoting organic farming. 

  14. A dinâmica familiar no contexto da crise suicida The family dynamics in the context of suicide crisis

    Directory of Open Access Journals (Sweden)

    Liara Lopes Krüger

    2010-04-01

    Full Text Available Famílias inseridas no contexto suicida organizam suas relações em torno de histórias opressoras construídas através das gerações, que impedem o desenvolvimento de autonomia e continuidade. Este artigo objetiva pensar sistemicamente sobre a dinâmica familiar da crise gerada pela tentativa de suicídio de um dos seus membros. Neste estudo, seis famílias participaram de uma intervenção breve, desenvolvida com base na teoria sistêmica. Os dados foram analisados com base no Método de Comparação Constante, identificando-se categorias e a construção de hipóteses a respeito da dinâmica familiar no contexto da crise suicida. Os resultados mostram que os participantes estão limitados em sua capacidade de apoiar o desenvolvimento de uma identidade autônoma, porque a dinâmica familiar identifica as novas oportunidades de narrar a si mesmo como ameaça ao sistema de lealdades que mantém a continuidade da família, impedindo a renegociação desses códigos. O sofrimento se apresenta como emoção que limita novas trocas, surgindo o comportamento suicida como alternativa.Families inserted in the suicide context tend to organize their relations around oppressive histories constructed over generations that hinder the development of autonomy and continuity. This paper aims at thinking systematically about the family dynamics of the crisis generated by the suicide attempt of one of its members. In this study, six families participated of a brief intervention developed on the basis of the systemic theory. The Grounded Theory analysis procedures made possible the identification of the categories and the construction of hypotheses regarding the family dynamics within the context of the suicide crisis. The result shows that participants are limited in their capacity of supporting the development of an independent identity because the family dynamics identifies new opportunities of narrating to oneself as a menace to the system of loyalties

  15. Utilization of structural steel in buildings.

    Science.gov (United States)

    Moynihan, Muiris C; Allwood, Julian M

    2014-08-08

    Over one-quarter of steel produced annually is used in the construction of buildings. Making this steel causes carbon dioxide emissions, which climate change experts recommend be reduced by half in the next 37 years. One option to achieve this is to design and build more efficiently, still delivering the same service from buildings but using less steel to do so. To estimate how much steel could be saved from this option, 23 steel-framed building designs are studied, sourced from leading UK engineering firms. The utilization of each beam is found and buildings are analysed to find patterns. The results for over 10 000 beams show that average utilization is below 50% of their capacity. The primary reason for this low value is 'rationalization'-providing extra material to reduce labour costs. By designing for minimum material rather than minimum cost, steel use in buildings could be drastically reduced, leading to an equivalent reduction in 'embodied' carbon emissions.

  16. Metallurgy of steels for PWR pressure vessels

    International Nuclear Information System (INIS)

    Kepka, M.; Mocek, J.; Barackova, L.

    1980-01-01

    A survey and the chemical compositions are presented of reactor pressure vessel steels. The metallurgy is described of steel making for pressure vessels in Japan and the USSR. Both acidic and alkaline open-hearth steel is used for the manufacture of ingots. The leading world manufacturers of forging ingots for pressure vessels, however, exclusively use electric steel. Vacuum casting techniques are exclusively used. Experience is shown gained with the introduction of the manufacture of forging ingots for pressure vessels at SKODA, Plzen. The metallurgical procedure was tested utilizing alkaline open hearths, electric arc furnaces and facilities for vacuum casting of steel. Pure charge raw materials should be used for securing high steel purity. Prior to forging pressure vessel rings, not only should sufficiently big bottoms and heads be removed but also the ingot middle part should be scrapped showing higher contents of impurities and nonhomogeneous structure. (B.S.)

  17. Metallurgy of steels for PWR pressure vessels

    Energy Technology Data Exchange (ETDEWEB)

    Kepka, M; Mocek, J; Barackova, L [Skoda, Plzen (Czechoslovakia)

    1980-09-01

    A survey and the chemical compositions are presented of reactor pressure vessel steels. The metallurgy is described of steel making for pressure vessels in Japan and the USSR. Both acidic and alkaline open-hearth steel is used for the manufacture of ingots. The leading world manufacturers of forging ingots for pressure vessels, however, exclusively use electric steel. Vacuum casting techniques are exclusively used. Experience is shown gained with the introduction of the manufacture of forging ingots for pressure vessels at SKODA, Plzen. The metallurgical procedure was tested utilizing alkaline open hearths, electric arc furnaces and facilities for vacuum casting of steel. Pure charge raw materials should be used for securing high steel purity. Prior to forging pressure vessel rings, not only should sufficiently big bottoms and heads be removed but also the ingot middle part should be scrapped showing higher contents of impurities and nonhomogeneous structure.

  18. Ferritic/martensitic steels: Promises and problems

    International Nuclear Information System (INIS)

    Klueh, R.L.; Ehrlich, K.; Abe, F.

    1992-01-01

    Ferritic/martensitic steels are candidate structural materials for fusion reactors because of their higher swelling resistance, higher thermal conductivity, lower thermal expansion, and better liquid-metal compatibility than austenitic steels. Irradiation effects will ultimately determine the applicability of these steels, and the effects of irradiation on microstructure and swelling, and on the tensile, fatigue, and impact properties of the ferritic/martensitic steels are discussed. Most irradiation studies have been carried out in fast reactors, where little transmutation helium forms. Helium has been shown to enhance swelling and affect tensile and fracture behavior, making helium a critical issue, since high helium concentrations will be generated in conjunction with displacement damage in a fusion reactor. These issues are reviewed to evaluate the status of ferritic/martensitic steels and to assess the research required to insure that such steels are viable candidates for fusion applications

  19. Nitrogen-containing steels and thermomechanical treatment

    International Nuclear Information System (INIS)

    Kaputkina, L.; Prokoshkina, V.G.; Svyazhin, G.

    2004-01-01

    The strengthening of nitrogen-containing corrosion-resistant steels resulting from alloying and thermomechanical treatment have been investigated using X-ray diffraction analysis, light microscopy, hardness measurements and tensile testing. Combined data have been obtained for nitrogen interaction with alloying elements , peculiarities of deformed structure and short-range of nitrogen-containing steels of various structural classes. The higher nitrogen and total alloying element contents, the higher deformation strengthening. Prospects of use the steels with not high nitrogen content and methods of their thermomechanical strengthening are shown. High temperature thermomechanical treatment (HTMT) is very effective for obtaining high and thermally stable constructional strength of nitrogen-containing steels of all classes. The HTMT is most effective if used in a combination with dispersion hardening for aging steels or in the case of mechanically unstable austenitic steels. (author)

  20. Evaluation criteria of structural steel reliability

    International Nuclear Information System (INIS)

    Zav'yalov, A.S.

    1980-01-01

    Different low-carbon and medium-carbon structural steels are investigated. It is stated that steel reliability evaluation criteria depend on the fracture mode, steel suffering from the brittle fracture under the influence of the stresses (despite their great variety) arising in articles during the production and operation. Fibrous steel fracture at the given temperature and article thickness says about its high ductility and toughness and brittle fractures are impossible. Brittle fractures take place in case of a crystalline and mixed fracture with a predominant crystalline component. Evaluation methods of article and sample steel structural strength differing greatly from real articles in a thickness (diameter) or used at temperatures higher than possible operation temperatures cannot be reliability evaluation criteria because at a great thickness (diameter) and lower operation temperatures steel fracture and its strain mode can change resulting in a sharp reliability degradation

  1. DETERMINANTS OF RETAINED EARNINGS IN PROFITABLE STEEL COMPANIES IN INDIA: A STUDY OF STEEL SECTOR

    OpenAIRE

    Dr. Sohaib Masood

    2018-01-01

    In this paper an attempt has been made to identify the important determinants of retained earnings in profitable steel companies in steel sector of India and which have impact on the retention of earnings of steel companies under study. Multiple linear regression is used to identify the determinants of retained earnings for a period of sixteen years. Also the importance of retained earnings as a source of finance for steel sector companies is also studied in the paper.

  2. Evaluation of Flash Bainite in 4130 Steel

    Science.gov (United States)

    2011-07-01

    Technical Report ARWSB-TR-11011 Evaluation of Flash Bainite in 4130 Steel G. Vigilante M. Hespos S. Bartolucci...4. TITLE AND SUBTITLE Evaluation of Flash Bainite in 4130 Steel 5a. CONTRACT NUMBER 5b. GRANT NUMBER 5c. PROGRAM ELEMENT...need to be addressed, the Flash Bainite processing of 4130 steel demonstrates promise for applications needing a combination of high strength with

  3. Mechanism of creep in stainless steel

    International Nuclear Information System (INIS)

    Monteiro, S.N.; Silveira, T.L.

    In the present work the creep criterions to identify the deformation mechanisms through the exponent of the strain rate versus stress relationship are presented. When applied to several stainless steels these criterions show an apparent contradiction for the proper mechanism acting at Σ/D above 10 9 /cm 2 . Microstructural aspects interfering in different manners with the fracture of these steels could be a reason for rationalizing the contradictory behavior. This is discussed in suggested deformation maps for the steels investigated [pt

  4. Problems in development of pressure vessel steels

    International Nuclear Information System (INIS)

    McMahon, C.Y.

    1980-01-01

    The tendency of steels to intercrystalline fracture at low stresses is the main factor, limiting fracture resistance of steels in agressive media at conventional and elevated temperatures. The reasons for the phenomenon are analyzed. In particular, the role of grain boundary segregations of non-metallic impurities is pointed out. The ways of the problem solving both at the expense of corresponding microstructure control and by means of selection of the steel chemical composition are considered

  5. Experimental studies of Steel Corrugated Constructions

    Directory of Open Access Journals (Sweden)

    Lazarev Yuriy

    2016-01-01

    Full Text Available The purpose of this particular article is to assess existing calculations of steel corrugated constructions. Steel Corrugated Construction is a perspective type of constructions, which is exhibiting numerous advantages in comparison with one that currently applied in automobile and railroad networks (reinforced concrete water-throughput pipes, reinforced concrete frame bridges. The evaluation of experimental data on models of constructions of this particular type has been carried out in order to improve calculations of Steel Corrugated Constructions.

  6. Auburn Steel Company radioactive contamination incident

    International Nuclear Information System (INIS)

    Bradley, F.J.; Cabasino, L.; Kelly, R.; Awai, A.; Kasyk, G.

    1986-04-01

    On February 21, 1983, workers at the Auburn Steel Company, Auburn, New York discovered that about 120 tons of steel poured that day had become contaminated with 60 Co. In addition to the steel, the air cleaning system and portions of the mill used in casting the steel were contaminated. Approximately 25 curies of 60 Co were involved. Decontamination and disposal of the contamination cost in excess of $2,200,000. This report details the discovery of the contamination, decontamination of the plant and disposal of the contamination

  7. Applications of electron beam to precoated steel

    International Nuclear Information System (INIS)

    Koshiishi, K.; Masuhara, K.

    1992-01-01

    Applications of EB to precoated steel started with paint cure and have expanded to film lamination and surface modification. These applications can offer precoated steel some advantages which are difficult or impossible to gain by thermal methods. But there are also such problems as adhesion, formability and paintability in EB processing. In practice, using EB technologies along with thermal technologies cannot be avoided for precoated steel at the present. Future development of EB applications to precoated steel will depend on how we can seek superiority and distinction of EB technology against conventional and competitive technologies. (author)

  8. Industrial investigations of the liquid steel filtration

    Directory of Open Access Journals (Sweden)

    K. Janiszewski

    2014-07-01

    Full Text Available Hitherto existing investigations concerning the ceramic filter use in the steel making processes have given good results. The obtained results of filtration have proved that this method may be used as an effective and cheap way of steel filtration from non-metallic inclusions. Placing filters in the tundish is the best location considering the limitation of the possibility of secondary pollution of steel. Yet, the results presented in this paper, of an experiment prepared and carried out in the industrial environment, are the only positive results obtained, which are connected with so much quantities of liquid steel processed with use of the multi-hole ceramic filters.

  9. Data for a steel industry model

    OpenAIRE

    Mæstad, Ottar

    2000-01-01

    SNF has recently developed a new model of the steel market and some of the major factor markets connected to the steel industry. The aim of the model has been to study how regulations of the emissions of carbon dioxide (CO2) in the steel industry might affect the structure of the industry. It has also been an objective to investigate how structural changes in the steel industry might influence on the industry’s demand for transport services. This paper outlines the details about the data that...

  10. Advanced high strength steels for automotive industry

    Energy Technology Data Exchange (ETDEWEB)

    Galan, J.; Samek, L.; Verleysen, P.; Verbeken, K.; Houbert, Y.

    2012-11-01

    The car industry is facing pressure because of the growing demand for more fuel-efficient passenger cars. In order to limit energy consumption and air pollution the weight of the car body has to be reduced. At the same time, high levels of safety have to be guaranteed. In this situation, the choice of material becomes a key decision in car design. As a response to the requirements of the automotive sector, high strength steels and advanced high strength steels have been developed by the steel industry. These modern steel grades offer an excellent balance of low cost, light weight and mechanical properties. (Author) 48 refs.

  11. Welding Metallurgy and Weldability of Stainless Steels

    Science.gov (United States)

    Lippold, John C.; Kotecki, Damian J.

    2005-03-01

    Welding Metallurgy and Weldability of Stainless Steels, the first book in over twenty years to address welding metallurgy and weldability issues associated with stainless steel, offers the most up-to-date and comprehensive treatment of these topics currently available. The authors emphasize fundamental metallurgical principles governing microstructure evolution and property development of stainless steels, including martensistic, ferric, austenitic, duplex, and precipitation hardening grades. They present a logical and well-organized look at the history, evolution, and primary uses of each stainless steel, including detailed descriptions of the associated weldability issues.

  12. O ciclo do café durante a República Velha: uma análise com a abordagem de dinâmica de sistemas

    Directory of Open Access Journals (Sweden)

    Thiago Caliari

    2011-05-01

    Full Text Available O objetivo deste trabalho é fazer uma análise sistêmica da dinâmica da produção cafeeira no Brasil com foco no período 1900-1930. A motivação para abordar a questão sob a ótica da dinâmica de sistemas (system dynamics é que essa metodologia é especialmente adequada para modelar processos sujeitos à complexidade dinâmica, como os ciclos de produção de commodities. Mostrar-se-á que modelar e simular a dinâmica da produção de café no Brasil com essa metodologia permite, em primeiro lugar, realizar experimentos contra-factuais que possibilitam avaliar quantitativamente o efeito de políticas de defesa de preços, como as políticas de valorização, complementando a já extensa e rica literatura sobre o assunto. Em segundo lugar, será sugerido que abordar a questão sob esta ótica ajuda a extrair insights de política não apenas para o café como para outras commodities, das quais o Brasil ainda depende de forma importante para manter o equilíbrio em suas contas externas.

  13. Role of RecA protein in untargeted UV mutagenesis of bacteriophage lambda: evidence for the requirement for the dinB gene

    International Nuclear Information System (INIS)

    Brotcorne-Lannoye, A.; Maenhaut-Michel, G.

    1986-01-01

    Untargeted UV mutagenesis of bacteriophage lambda--i.e., the increased recovery of lambda mutants when unirradiated lambda infects UV-irradiated Escherichia coli--is thought to be mediated by a transient decrease in DNA replication fidelity, generating mutations in the newly synthesized strands. Using the bacteriophage lambda cI857----lambda c mutation system, we provide evidence that the RecA protein, shown previously to be required for this mutagenic pathway, is no longer needed when the LexA protein is inactivated by mutation. We suggest that the error-prone DNA replication responsible for UV-induced untargeted mutagenesis is turned on by the presence of replication-blocking lesions in the host cell DNA and that the RecA protein is required only to derepress the relevant din gene(s). This is in contrast to mutagenesis of irradiated bacteria or irradiated phage lambda, in which activated RecA protein has a second role in mutagenesis in addition to the cleavage of the LexA protein. Among the tested din genes, the dinB gene product (in addition to the uvrA and uvrB gene products) was found to be required for untargeted mutagenesis of bacteriophage lambda. To our knowledge, a phenotype associated with the dinB gene has not been reported previously

  14. Convergencia, divergencia y estratificación. Estudio comparativo de la dinámica de crecimiento de la manufactura en los municipios mexicanos y los condados estadunidenses

    Directory of Open Access Journals (Sweden)

    Rodolfo Cermeño

    2009-01-01

    Full Text Available En este artículo se analiza la dinámica del valor agregado manufacturero per capita como proxy del ingreso per capita de los municipios de México y condados de Estados Unidos. Específicamente, se busca determinar si existe convergencia (absoluta o condicional, divergencia o estratificación. Se utiliza un modelo de panel dinámico sin regresores exógenos y se considera el problema del sesgo en este contexto específico. En general se concluye que la dinámica del valor agregado per capita de los condados de Estados Unidos muestra convergencia condicional y poca dispersión de sus estados estacionarios. En cambio, en el caso de México se encuentra una dinámica congruente con crecimiento estratificado. El estudio también encuentra que el crecimiento de la manufactura en los condados de EEUU y los municipios de México diverge en el tiempo.

  15. PRODUCEREA ŞI COMERCIALIZAREA BĂUTURILOR ALCOOLICE ÎN ORAŞELE DIN RZECZPOSPOLITA ŞI ŢARA MOLDOVEI (SEC.XVI-XVII

    Directory of Open Access Journals (Sweden)

    Nicolae DUDNICENCO

    2016-12-01

    Full Text Available Articolul vizează producerea, comercializarea şi consumul băuturilor alcoolice în oraşele din Rzeczpospolita (a berii, a votcii, a miedului şi din Ţara Moldovei (a vinului, a rachiului, a berii, a brăgii în sec. XVI-XVII. Se investighează mo­dul de producere, comercializare, precum şi taxele care se percepeau pentru băuturile alcoolice în oraşele din teri­toriul dat. Producerea băuturilor alcoolice aducea venituri mari economiei oraşelor din spaţiul indicat supra.PRODUCTION AND COMMERCIALISATION OF ALCOHOLIC DRINKS IN RZECZPOSPOLITA AND MOLDOVA PRINCIPALITY CITIES (XVI-XVII C.The article targeting the production, marketing and consumption of alcoholic drinks in the cities from Rzeczpospolita (beer, vodka, mead and from Moldova (wine, spirits, beer, braga in the XVI-XVII c. It have been investigated the mode of production, sell and taxes at which were subjected the alcoholic drinks in the cities on that territory. Production of alcoholic drinks brought substantial revenues to the economy of the cities from the indicated area.

  16. Ernst Rüdin's Unpublished 1922-1925 Study "Inheritance of Manic-Depressive Insanity": Genetic Research Findings Subordinated to Eugenic Ideology.

    Science.gov (United States)

    Kösters, Gundula; Steinberg, Holger; Kirkby, Kenneth Clifford; Himmerich, Hubertus

    2015-11-01

    In the early 20th century, there were few therapeutic options for mental illness and asylum numbers were rising. This pessimistic outlook favoured the rise of the eugenics movement. Heredity was assumed to be the principal cause of mental illness. Politicians, scientists and clinicians in North America and Europe called for compulsory sterilisation of the mentally ill. Psychiatric genetic research aimed to prove a Mendelian mode of inheritance as a scientific justification for these measures. Ernst Rüdin's seminal 1916 epidemiological study on inheritance of dementia praecox featured large, systematically ascertained samples and statistical analyses. Rüdin's 1922-1925 study on the inheritance of "manic-depressive insanity" was completed in manuscript form, but never published. It failed to prove a pattern of Mendelian inheritance, counter to the tenets of eugenics of which Rüdin was a prominent proponent. It appears he withheld the study from publication, unable to reconcile this contradiction, thus subordinating his carefully derived scientific findings to his ideological preoccupations. Instead, Rüdin continued to promote prevention of assumed hereditary mental illnesses by prohibition of marriage or sterilisation and was influential in the introduction by the National Socialist regime of the 1933 "Law for the Prevention of Hereditarily Diseased Offspring" (Gesetz zur Verhütung erbkranken Nachwuchses).

  17. Influencia de la Compresión del Rango Dinámico en la Evaluación de Calidad de Grabaciones Musicales

    DEFF Research Database (Denmark)

    Borup, Matias Bødker; Zabbal, Paul; Ordoñez, Rodrigo

    2014-01-01

    menor rango dinámico que las versiones anteriores. En el presente estudio, grabaciones musicales fueron procesadas con niveles distintos de compresión y luego evaluadas subjetivamente en relación a su profundidad, claridad, presencia de ruidos molestos o artefactos sonoros, calidad y preferencia. El...

  18. The Comparative Study of Morals and Democracy and Their Effect on the Behavioral Reflections of Khawaja Nasir Al-Din Tusi and John Dewey

    Science.gov (United States)

    Mirzaei, Khalil; Golestani, Sayyed Hashem; Vaezi, Sayyed Hossain

    2016-01-01

    This study was aimed at comparatively analyzing morals and democracy from John Dewey and Khawaja Nasir al-Din Tusi's viewpoint. It also sought the effect of the two philosophers' viewpoint about morals and democracy and behavioral reflections. The purpose of this study was also to become familiar with the effect of morals and democracy on…

  19. Publicidad dinámica y plataformas digitales: brand placement en espacios públicos y transmisiones deportivas en televisión

    OpenAIRE

    Ortiz Sobrino, Miguel Ángel; Montemayor Ruiz, Francisco Javier

    2014-01-01

    Las imágenes virtuales, la publicidad digital dinámica multimedia diseñada para espacios públicos y las plataformas digitales utilizadas en las transmisiones deportivas en televisión son hoy herramientas esenciales para la estrategia del emplazamiento de las marcas publicitarias.

  20. O "lugar" do filho adotivo na dinâmica parental: revisão integrativa de literatura

    OpenAIRE

    Morelli, Ana Bárbara; Scorsolini-Comin, Fabio; Santeiro, Tales Vilela

    2015-01-01

    O estudo objetivou apresentar uma revisão integrativa de literatura acerca do lugar reservado às crianças na dinâmica dos pretendentes à adoção. O espaço destinado à criança no psiquismo parental fornece indícios de como será a interação entre os membros da nova família. Critérios de busca para definição da amostra (N=24): artigos disponíveis nas bases LILACS, SciELO e PePSIC; publicados entre 2002 e 2012; e cruzamento dos unitermos "pais", "casais", "adoção", "fantasia" e "psicanálise". Os r...

  1. El enfoque de los sistemas dinámicos en el aprendizaje del bote en baloncesto en un contexto escolar

    Directory of Open Access Journals (Sweden)

    Fernando S\\u00E1nchez Ba\\u00F1uelos

    2005-01-01

    Full Text Available En este articulo tratamos de demostrar la teoría de los sistemas dinámicos. Se realizó un diseño cuasiexperimental con dos grupos intactos no equivalentes. Grupo experimental (GE:25; grupo de control (GC:20; con medidas pretest y postest. La variable independiente fue la utilización de unas gafas limitadoras de visión. La variable dependiente fue el tiempo mínimo en la ejecución de test de habilidad en el bote. La unidad didáctica de 7 sesiones era de fundamentos técnicos en baloncesto. Los resultados muestran como se han producido mejoras muy significativas (p<0,001 en el test de bote en zig-zag en el GE, aunque tambien existen mejoras en el grupo de control utilizando un modelo de enseñanza-aprendizaje convencional en EF.

  2. El consumo de sustancias psicoactivas y las formas de organización y dinámica familiar

    Directory of Open Access Journals (Sweden)

    María Eugenia Agudelo Bedoya

    2016-01-01

    Full Text Available Este artículo, derivado de una investigación con niños, niñas y adolescentes hombres y mujeres escolares de la ciudad de Medellín, presenta la asociación entre el riesgo de consumo y la dependencia de sustancias psicoactivas legales (alcohol y cigarrillo e ilegales (marihuana, cocaína, éxtasis, inhalables, entre otras, con diferentes formas de organización familiar, procesos de autoridad, cohesión y comunicación entre los padres. Los hallazgos indican que en todas las formas de organización familiar y cualquiera sea la manera como se den los procesos de la dinámica abordados, se encuentra riesgo presencia de dependencia a sustancias psicoactivas.

  3. Beneficis de l'Avaluació Dinàmica per a la Prova Final de Batxillerat

    Directory of Open Access Journals (Sweden)

    Nuria Otero de Juan

    2014-06-01

    Full Text Available Partint de l'anàlisi de les deficiències detectades en la Prova d'Accés a la Universitat actual, este article realitza una anàlisi dels factors incidentals externs a l'examen, proposa un sistema modern d'avaluació de llengu?es com l'avaluació dinàmica, i estudia els avantatges i desavantatges de la seua aplicació a la Prova Final de Batxillerat. Les propostes ací realitzades es relacionen amb el projecte OPENPAU (FFI2011-22442 d'un consorci de 8 universitats per a la revisió de la Prova d’Accés a la Universitat.  

  4. UNELE DATE CU REFERIRE LA BISERICA ARMEANĂ „ÎNVIEREA DOMNULUI” DIN CHIŞINĂU

    Directory of Open Access Journals (Sweden)

    Ion GUMENÂI

    2018-05-01

    Full Text Available Articolul de faţă se referă la istoria urbanistică a Chişinăului, iar dacă e să fim mai precişi – la construcţia Bisericii armene „Învierea Domnului” ridicate în cimitirul armenesc din această urbe. O atenţie aparte se acordă unor documente ce au fost colectatela Arhivele Naţionaleale Armeniei. SOME DATA WITH REFERENCE TO THE ARMENIAN CHURCH THERESURRECTION OF CHRIST IN CHISINAUThe present article refers to the urban history of Chisinau, and if it is to be more precise in the construction of the Armenian Church the Resurrection of the Lord built in the Armenian cemetery of this city. Particular attention is drawn to documents that were collected at the National Archives of Armenia.

  5. The Parallel SBAS-DInSAR algorithm: an effective and scalable tool for Earth's surface displacement retrieval

    Science.gov (United States)

    Zinno, Ivana; De Luca, Claudio; Elefante, Stefano; Imperatore, Pasquale; Manunta, Michele; Casu, Francesco

    2014-05-01

    Differential Synthetic Aperture Radar Interferometry (DInSAR) is an effective technique to estimate and monitor ground displacements with centimetre accuracy [1]. In the last decade, advanced DInSAR algorithms, such as the Small Baseline Subset (SBAS) [2] one that is aimed at following the temporal evolution of the ground deformation, showed to be significantly useful remote sensing tools for the geoscience communities as well as for those related to hazard monitoring and risk mitigation. DInSAR scenario is currently characterized by the large and steady increasing availability of huge SAR data archives that have a broad range of diversified features according to the characteristics of the employed sensor. Indeed, besides the old generation sensors, that include ERS, ENVISAT and RADARSAT systems, the new X-band generation constellations, such as COSMO-SkyMed and TerraSAR-X, have permitted an overall study of ground deformations with an unprecedented detail thanks to their improved spatial resolution and reduced revisit time. Furthermore, the incoming ESA Sentinel-1 SAR satellite is characterized by a global coverage acquisition strategy and 12-day revisit time and, therefore, will further contribute to improve deformation analyses and monitoring capabilities. However, in this context, the capability to process such huge SAR data archives is strongly limited by the existing DInSAR algorithms, which are not specifically designed to exploit modern high performance computational infrastructures (e.g. cluster, grid and cloud computing platforms). The goal of this paper is to present a Parallel version of the SBAS algorithm (P-SBAS) which is based on a dual-level parallelization approach and embraces combined parallel strategies [3], [4]. A detailed description of the P-SBAS algorithm will be provided together with a scalability analysis focused on studying its performances. In particular, a P-SBAS scalability analysis with respect to the number of exploited CPUs has

  6. Gentrificação nas Ilhas do Porto: uma dinâmica embrionária

    OpenAIRE

    Matos, Fátima Loureiro de

    2017-01-01

    Neste artigo pretende-se evidenciar dinâmicas que estão a ocorrer nas ilhas da cidade do Porto, associadas à expansão da atratividade turística, que tem desencadeado a reabilitação e a gentrificação de alguns contextos urbanos. Trata-se de um trabalho exploratório, ainda em curso, baseado em trabalho de campo, algumas entrevistas e análises estatísticas. As ilhas são um património histórico e da vida da cidade, que pela sua morfologia urbana específica, atrai novos residentes e turistas....

  7. Dinámicas relaciones de una familia conformada por una pareja homosexual masculina en Santiago de Cali

    OpenAIRE

    Niño Valencia, Marlon Antonio

    2015-01-01

    Objetivo. Este estudio caracterizo las dinámicas relacionales de una familia homosexual de la ciudad de Cali, a través de la cohesión, la adaptabilidad, la comunicación y permeabilidad. Metodología. Investigación cualitativa basada en un estudio de caso a partir de una entrevista semiestructurada. El análisis de la información se realizó a través del programa Atlas Ti V6.0., utilizando la técnica de análisis temático. Resultados. Familia homosexual con una percepción de apoyo s...

  8. Dinâmicas de grupo como recurso pedagógico no ensino de ciências

    OpenAIRE

    Pereira, Elienae Genésia Corrêa

    2013-01-01

    Este artigo expõe resultados parciais de um estudo de Mestrado realizado com alunos do 6º ano do Ensino Fundamental de uma escola privada do Município do Rio de Janeiro, no contexto Lixo-Água-Saúde, visando estudar a influência de ações pedagógicas em suas percepções e no processo de aprendizagem. Descrevemos aqui o uso de duas dinâmicas de grupo. As discussões geradas durante a atividade permitiram uma maior reflexão e a ocorrência de mudanças nas concepções prévias dos sujeitos, permitindo-...

  9. Estratégias empresariais, dinâmicas informacionais e identidade de marca na economia criativa

    Directory of Open Access Journals (Sweden)

    Vladimir Sibylla Pires

    Full Text Available Estudo centrado nas dinâmicas informacionais do processo de construção de identidades de marcas por centrais de criatividade, que se valem de redes originadas das interações comunicacionais empreendidas entre grupos de trabalho internos e os atores e grupos sociais externos a elas. Considera-se a informação em sua dimensão performativa. Vale-se de uma abordagem poliepistêmica da Ciência da Informação. Apresenta uma pesquisa empírica realizada em uma empresa da indústria da moda (Osklen, complementada por entrevistas com duas outras empresas da economia criativa.

  10. Reinterpretando la información de los vasos dinásticos de los Kaan ajawo’ob.

    Directory of Open Access Journals (Sweden)

    Pablo Alberto Mumary Farto

    2015-12-01

    Full Text Available Los conocidos como vasos dinásticos forman parte de una colección de alrededor de 17 vasos cerámicos caracterizados por la narrativa epigráfica que contienen en la cual se disponen listados de supuestos gobernantes de la dinastía Kaan desde su hipotético fundador. Tomando los trabajos de finales del siglo XX realizados por los investigadores Robicsek, Hales y Martin, reanalizaremos la información epigráfica contenida en dos vasos seleccionados proponiendo nuevas lecturas y, consecuentemente, presentando información que no había sido tenida en cuenta.

  11. Dinámica de Sistemas aplicada al Mercado de Hidrocarburos Líquidos en España

    OpenAIRE

    Bozhidarova Vladimirova, Natali

    2015-01-01

    En primer lugar, en este TFG se trata el mercado de petróleo a nivel mundial, comentando las reservas, la producción y el consumo de petróleo producidos en los últimos diez años, así como, los principales conflictos bélicos sucedidos en la historia, ligados estrechamente al petróleo. En segundo lugar, se aporta información relevante sobre el mercado de hidrocarburos en España, para después, aplicar la Dinámica de Sistemas a este mercado y poder ver la evolución que tendrán las variables princ...

  12. Estudo dos efeitos dinâmicos em condutas de PVC durante regimes tansitórios

    OpenAIRE

    Kepler, Alexandre; Cameira, Dídia I.; Ribeiro, Luisa F.

    2009-01-01

    A teoria clássica do golpe de aríete é usualmente utilizada para a modelaçao de sistemas de condutas em pressão e, tipicamente, considera que a atenuação de uma onda de pressão numa conduta forçada ocorre principalmente devido ao efeito do atrito calculado para condiçoes de escoamento permanente. No entanto, para a descrição do comportamento hidráulico de sistemas existentes, debe ser dada atenção especial aos diferentes efeitos dinâmicos relacionados com a dissipação de energia durante a o...

  13. Use of ferritic steels in breeder reactors worldwide

    International Nuclear Information System (INIS)

    Patriarca, P.

    1983-01-01

    The performance of LMFBR reactor steam generator materials is reviewed. Tensile properties of stainless steel-304, stainless steel-316, chromium-molybdenum steels, and Incoloy 800H are presented for elevated temperatures

  14. Monitoreo neurointensivo en pediatría (II: Pruebas dinámicas

    Directory of Open Access Journals (Sweden)

    Eduardo M. Pleguezuelo Rodríguez

    2001-06-01

    Full Text Available El traumatismo craneoencefálico grave (TCEG continúa siendo la principal causa de muerte y discapacidad en pediatría, de la misma manera es el factor determinante del pronóstico en niños con trauma multisistémico, no sólo al llevar a la desaparición del ser físico, sino que deja en ocasiones en estados limítrofes entre la vida y la muerte como son los llamados estados vegetativos. En las últimas décadas se ha revolucionado el modo de tratamiento de estos pacientes, pasando del tratamiento neuroquirúrgico convencional, el cual se realizaba en salas de neurocirugía y se comportaba con una mortalidad mayor del 70 %, al tratamiento neurointensivo, Unidad de Cuidados Intensivos (UCI, y se define por el neuromonitoreo continuo, intensivo e invasivo, que permite identificar una serie de fenómenos fisiopatológicos que son diferentes para cada paciente y de esta manera tratarlos de forma racional, con lo cual se ha conseguido reducir la mortalidad a niveles inferiores al 30 %. Después de más de 5 años de experiencia con esta metodología, en el Hospital Provincial General de la provincia de Camagüey, y más de 2 años de realizar ésta en el Hospital Pediátrico provincial Docente, se decidió en este trabajo describir detalladamente la forma de realizar el monitoreo, así como los valores normales, utilidad clínica y las principales desviaciones patológicas de las variables más importantes en el neuromonitoreo intensivo, como son: presión intracraneal (PIC, hemodinámicas, metabólicas, las cuales pueden ser realizadas con modestos recursos, disponibles en la mayoría de nuestras salas de terapia intensiva. Este segundo trabajo recoge de forma muy sintética un determinado número de pruebas dinámicas y monitoreo del hemometabolismo cerebral de O2 que podemos realizar en el monitoreo de la PIC a pacientes con traumatismo craneoencefálico grave.Severe carnioencephalic trauma (SCET is still the main cause of death and disability

  15. LIMBA TEXTELOR RELIGIOASE PUBLICATE LA TIPOGRAFIA EXARHICEASCĂ DIN CHIŞINĂU: PARTICULARITĂŢI SINTACTICE

    Directory of Open Access Journals (Sweden)

    Claudia CEMÂRTAN

    2016-12-01

    Full Text Available Textul religios a constituit, în istoria limbii române, un model de scriere şi pentru textele din alte registre stilistice. Însă, după secolul al XVIII-lea stilul bisericesc devine complementar celui laic, diferenţiindu-se tot mai mult de acesta la toate nivelurile lui. Cercetarea unor tipărituri executate într-un spaţiu românesc rupt de la teritoriile neamului – în tipo­grafia exarhicească din Chişinăul secolului al XIX-lea, sub presiunea politică şi lingvistică a noilor stăpâni ruşi – poate oferi date preţioase ce caracterizează limba utilizată în această epocă în oficierea slujbei religioase pe meleagurile Basarabiei.Language of religious texts published in ExarchIal Typography from Chisinau: syntactic particularitiesReligious text was, in the history of Romanian language, a model of writing and for texts from other stylistic registers, but, after the eighteenth, the church style become complementary to the secular, differing more than it's at all levels. Research of prints executed in a Romanian space broken from the national territories - in Exarchal Typography from Chisinau in nineteenth century, under the political and linguistic pressure of new Russian masters - can provide valuable data that characterize the language used in this era in celebration of religious services in Bessarabia.

  16. ANALIZA COMPARATIVĂ A UNOR PARAMETRI DIN SEDIMENTUL URINAR LA SUBIECŢI DE SEX FEMININ ŞI MASCULIN

    Directory of Open Access Journals (Sweden)

    MARIOARA NICOLETA FILIMON

    2009-01-01

    Full Text Available Examinarea sedimentului urinar este necesară în oferirea de informaţii despre buna funcţionare a rinichilor, a întregului organism şi în depistarea posibilelor afecţiuni renale. S-a luat în studiu un lot de 129 subiecţi de sex faminin (83 şi masculin (46, la care li s-a determinat numărul de hematii, leucocite şi celule epiteliale din sedimentul urinar. Valorile obţinute au fost prelucrate statistic cu ajutorul programului statistic Minitab pentru a putea stabili daca exista sau nu diferenţe la cele 2 lotuir de subiecţi analizaţi. Numărul de hematii şi leucocite din sedimentul urinar al subiecţilor testaţi nu prezintă diferenţe semnificative la subiecţii de sex masculin şi feminin, pe când numărul celulelor epiteliale înregistrează diferenţe foarte semnificative la cele 2 sexe cu valori mai mari în cazul subiecţilor de sex feminin. Incidenţa leucocitelor în sedimentul urinar ala subiecţilor de sex masculin este mai mare decât la cei de sex feminin, la care predomină celulele epiteliale. Valoarea crescută a numărului de leucocite şi prezenţa florei bacteriene în sedimentul urinar la subiecţii de sex feminin şi masculin testaţi indică infecţii urinare.

  17. Biographical Compilation by as-Safadi Salah al-Din as a Source of the Golden Horde History

    Directory of Open Access Journals (Sweden)

    Zaynuddinov D.R.

    2016-12-01

    Full Text Available Publication and translation into Russian of extracts of sources on the Golden Horde history remains topical issue of contemporary source studies. Research objective: to introduce into academic circulation materials on the Golden Horde history from a previously unknown medieval Arab source. Research materials: Biographical Collection Aʿyān al-ʿAṣrwa-Aʿwān al-Naṣr (Outstanding personalities of this century, and the champions of victory belonging to the pen of the Mamluk historian al-Safadi, Salah al-Din (696 AH / 1297 – 764 GH./1363. Results and novelty of the research: The work was written by the author in Egypt and Syria in the second half of the 14th century, that is, during the heyday of the Golden Horde. It was first published in 1998 in Beirut in six volumes, the latter being composed of indexes. The amount of volume ranges from 685 (Volume 4 to 736 (Vol.1 pages, which makes a total of 3578 pages (without indexes. The novelty of the paper consists in the fact that it introduces for the first time into scholarly circulation Russian translation of biographies of the Golden Horde khans Tokhta and Uzbek, of the Mamluk physician al-Numan, of amir Kusun and Sultan al-Nasir. The article also contains an analysis of the collection as well as translation of certain sections of the work related to the history of Dasht-i Kipchak, together with brief comments. In conclusion, I would like to note that the introduction into the scholarly circulation of Salah al-Din al-Safadi’s biographical collection Aʿyān al-ʿAṣrwa-Aʿwān al-Naṣr will provide a lot of useful information and help to clarify the available data on the history of the Golden Horde.

  18. Un modelo dinámico bayesiano para pronóstico de energía diaria

    Directory of Open Access Journals (Sweden)

    Marisol Valencia Cárdenas

    2013-07-01

    Full Text Available Los modelos dinámicos bayesianos son una alternativa útil para elaborar pronósticos con pocos datos históricos, o que ayudan a complementar la poca información que se tenga. En este trabajo se propone el diseño de un algoritmo para realizar pronósticos usando un modelo dinámico bayesiano basado en Filtro de Kalman. Se ilustra el procedimiento aplicándolo al pronóstico de demanda de energía diaria de Colombia, lo cual puede ser útil en sistemas que presenten fallas, o en regiones donde apenas inicia el abastecimiento energético. La eficiencia se determina con el indicador de error absoluto medio (MAPE de ajuste y de pronóstico; este último resulta menor del 3%, valor adecuado para mostrar validez del método propuesto. Dynamic Bayesian Models are a useful alternative to make forecasts with few historical data, or that permits to complement the little information you have.  In this paper we propose an algorithm design to forecast using a dynamic Bayesian model based on Kalman Filter. We illustrate the procedure by applying it to the prediction of daily energy demand of Colombia, which can be useful in systems experiencing failures, or in regions where energy supply is just beginning. The efficiency is determined by the Average Absolute Error Indicator (MAPE, of adjustment and forecast; the last one is less than 3%, appropriate value to show validity of the proposed method.

  19. Desarrollo de las capacidades dinámicas para la implementación de cambios organizacionales

    Directory of Open Access Journals (Sweden)

    Lidia María Pérez Vallejo

    2015-10-01

    Full Text Available Las organizaciones se desarrollan en entornos que cambian rápida y constantemente derivado de dos factores principales: las propias transformaciones de los agentes económicos y sociales; y la actividad y dinamismo de la competencia y el desarrollo tecnológico. Unido a esto, los mercados han variado considerablemente siendo más amplios y exigentes, lo que ha determinado la necesidad de búsqueda y desarrollo de alternativas que permitan la supervivencia y posterior estabilidad de las organizaciones; es por ello que este trabajo tuvo como objetivo mostrar un procedimiento para desarrollar las capacidades dinámicas como una vía favorecedora para la implementación de los cambios organizacionales. La metodología consta de cinco fases y 12 etapas con un enfoque estratégico, sistémico y por procesos, elementos que no han sido abordados de forma integrada en anteriores metodologías y que permitió determinar el conjunto de variables que son necesarias en la transformación de la organización para alcanzar las metas propuestas. Se validó en una entidad hotelera cubana y se determinaron las variables para desarrollar la capacidad dinámica y la adaptación a los cambios del entorno para mejorar el desempeño de la organización, estas fueron: motivación y clima laboral, resistencia al cambio, diseño e integración de los procesos, cultura organizacional y liderazgo. Se logró el mejoramiento continuo de la efectividad de los procesos de la organización al diseñar el conjunto de indicadores distribuido por las cuatro perspectivas del cuadro de mando integral.

  20. Desarrollo de las capacidades dinámicas para la implementación de cambios organizacionales

    Directory of Open Access Journals (Sweden)

    Lidia María Pérez Vallejo

    2015-11-01

    Full Text Available Las organizaciones se desarrollan en entornos que cambian rápida y constantemente derivado de dos factores principales: las propias transformaciones de los agentes económicos y sociales; y la actividad y dinamismo de la competencia y el desarrollo tecnológico. Unido a esto, los mercados han variado considerablemente siendo más amplios y exigentes, lo que ha determinado la necesidad de búsqueda y desarrollo de alternativas que permitan la supervivencia y posterior estabilidad de las organizaciones; es por ello que este trabajo tuvo como objetivo mostrar un procedimiento para desarrollar las capacidades dinámicas como una vía favorecedora para la implementación de los cambios organizacionales. La metodología consta de cinco fases y 12 etapas con un enfoque estratégico, sistémico y por procesos, elementos que no han sido abordados de forma integrada en anteriores metodologías y que permitió determinar el conjunto de variables que son necesarias en la transformación de la organización para alcanzar las metas propuestas. Se validó en una entidad hotelera cubana y se determinaron las variables para desarrollar la capacidad dinámica y la adaptación a los cambios del entorno para mejorar el desempeño de la organización, estas fueron: motivación y clima laboral, resistencia al cambio, diseño e integración de los procesos, cultura organizacional y liderazgo. Se logró el mejoramiento continuo de la efectividad de los procesos de la organización al diseñar el conjunto de indicadores distribuido por las cuatro perspectivas del cuadro de mando integral.