739 research outputs found
Welding-base metal investigation Final report, 27 Jun. 1964 - 28 Jul. 1965
Weld defects associated with aluminum alloys - monitoring weld shielding gas purit
VOLUMEN 20, NĂMERO 35 (1991)
PROPUESTA DE UNIFICACIĂN PARA LA NOMENCLATURA ESTRATIGRĂFICA DEL TERCIARIO DEL VALLE DEL CAUCA Y DEL CAUCA. Padilla, L. E.CARĂCTER CĂCLICO DEL TERCIARIO HULLERO DEL VALLE DEL CAUCA Y CAUCA. Padilla, L. E.LINEAMIENTOS DE DIRECCIĂN NORESTE-SURESTE EN LOS DEPARTAMENTOS DE SANTANDER Y NORTE DE SANTANDER, COLOMBIA. Ujueta, L. G.LA DUNITA DE MEDELLĂN Y SUS RELACIONES ESTRUCTURALES CON EL BASAMENTO METAMĂRFICO E INTRUSIVO DE LA CORDILLERA CENTRAL, DEPARTAMENTO DE ANTIOQUIA. Kammer, A
VOLUMEN 20, NĂMERO 35 (1991)
PROPUESTA DE UNIFICACIĂN PARA LA NOMENCLATURA ESTRATIGRĂFICA DEL TERCIARIO DEL VALLE DEL CAUCA Y DEL CAUCA. Padilla, L. E.CARĂCTER CĂCLICO DEL TERCIARIO HULLERO DEL VALLE DEL CAUCA Y CAUCA. Padilla, L. E.LINEAMIENTOS DE DIRECCIĂN NORESTE-SURESTE EN LOS DEPARTAMENTOS DE SANTANDER Y NORTE DE SANTANDER, COLOMBIA. Ujueta, L. G.LA DUNITA DE MEDELLĂN Y SUS RELACIONES ESTRUCTURALES CON EL BASAMENTO METAMĂRFICO E INTRUSIVO DE LA CORDILLERA CENTRAL, DEPARTAMENTO DE ANTIOQUIA. Kammer, A
Simultaneous Embeddings with Few Bends and Crossings
A simultaneous embedding with fixed edges (SEFE) of two planar graphs and
is a pair of plane drawings of and that coincide when restricted to
the common vertices and edges of and . We show that whenever and
admit a SEFE, they also admit a SEFE in which every edge is a polygonal curve
with few bends and every pair of edges has few crossings. Specifically: (1) if
and are trees then one bend per edge and four crossings per edge pair
suffice (and one bend per edge is sometimes necessary), (2) if is a planar
graph and is a tree then six bends per edge and eight crossings per edge
pair suffice, and (3) if and are planar graphs then six bends per edge
and sixteen crossings per edge pair suffice. Our results improve on a paper by
Grilli et al. (GD'14), which proves that nine bends per edge suffice, and on a
paper by Chan et al. (GD'14), which proves that twenty-four crossings per edge
pair suffice.Comment: Full version of the paper "Simultaneous Embeddings with Few Bends and
Crossings" accepted at GD '1
Abnormal adenosine-induced immunosuppression and cAMP metabolism in T lymphocytes of patients with systemic lupus erythematosus
2-Cyano-1-methylÂpyridinium nitrate
In the title compound, C7H7N2
+·NO3
â, all atoms except the methyl H atoms lie on a crystallographic mirror plane. The interÂlayer distance, including that between aligned N atoms from alternating cations and anions in adjacent layers, is exceptionally short at 3.055â
(1)â
Ă
. Two-dimensional CâHâŻO hydrogen-bonded networks link cations to anions, while CâHâŻN interÂactions link cations within each layer. AnionâÏ interÂactions with the cations assist in binding the layers together
A chronometric exploration of high-resolution âsensitive TMS maskingâ effects on subjective and objective measures of vision
Transcranial magnetic stimulation (TMS) can induce masking by interfering with ongoing neural activity in early visual cortex. Previous work has explored the chronometry of occipital involvement in vision by using single pulses of TMS with high temporal resolution. However, conventionally TMS intensities have been high and the only measure used to evaluate masking was objective in nature. Recent studies have begun to incorporate subjective measures of vision, alongside objective ones. The current study goes beyond previous work in two regards. First, we explored both objective vision (an orientation discrimination task) and subjective vision (a stimulus visibility rating on a four-point scale), across a wide range of time windows with high temporal resolution. Second, we used a very sensitive TMS-masking paradigm: stimulation was at relatively low TMS intensities, with a figure-8 coil, and the small stimulus was difficult to discriminate already at baseline level. We hypothesized that this should increase the effective temporal resolution of our paradigm. Perhaps for this reason, we are able to report a rather interesting masking curve. Within the classical-masking time window, previously reported to encompass broad SOAs anywhere between 60 and 120Â ms, we report not one, but at least two dips in objective performance, with no masking in-between. The subjective measure of vision did not mirror this pattern. These preliminary data from our exploratory design suggest that, with sensitive TMS masking, we might be able to reveal visual processes in early visual cortex previously unreported
Characteristics of Welding Fume Aerosol Investigated in Three Swedish Workshops
Potentially high human exposures to nanometer sized airborne particles occur due to welding and other thermal processes in industrial environments. Detailed field measurements of physical and chemical particle characteristics were performed in three work-shops in Sweden. Measurements were performed both in the plume 5-20 cm above the welding point and in the background air (more than 5 m away from the nearest known particle source). Particle number and mass concentrations were measured on-line. A low pressure impactor was used for size-resolved chemical particle composition. The in-plume measurements generated the chemical signatures for different welding processes. These signatures were then used to identify contributions from various processes to the particle concentrations in different size classes. The background number and mass concentrations increased by more than an order of magnitude during intense activities in the work-shops compared to low activities during breaks
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