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Electrical polarization of lead bromide crystals. II

REA Auditado

Electrical currents are measured as a function of time after application of a dc voltage on a cell arragement +C/PbBr2/C-. The presence of nonlinear polarization phenomena has been established from a test of Ohm's law, the superposition principle, and from initial and steady-state conductivities calculated from the polarization curves. In addition, nonlinear potential profiles were measured.

Tema: general: 

• Ciencias›Química

An automatic (or semi-automatic) apparatus for the determination of melting curves

REA Auditado

A description is given of an apparatus for the determination of heating curves by means of the “thin film” method The amount of substance used is about 500 rng The apparatus permits the automatic recording of heating curves with an accuracy of 0.001°C within a range of 0.2°C By simply resetting a resistance the next following range of 0.2°C may be recorded Larger ranges may be investigated completely automatically, with a temperature sensitivity inversely proportional to the range, however. The dimensions of the calonmetric part of the apparatus are discussed The thermometers used are platinu

Tema: general: 

• Ciencias›Química

Determining the influence of temperature on various types of standard resistors

REA Auditado

The temperature coefficient of standard resistors of various types is well-known to within an acceptable uncertainty, for the purposes that these resistors are used for in most calibration laboratories. There are instances where this information is insufficient, or not available from the manufacturer. A set of pre-used high precision resistors was recently acquired by the CSIR National Metrology Laboratory (CSIR NML) for maintenance of the resistance scale above 1 Ohm.

Tema: general: 

• Ingeniería y Ciencias Aplicadas›Ingeniería›Ingeniería (General)

Origen y significado geológico de la Anomalía Melipilla, Chile central

REA Auditado

La Anomalía Melipilla, una transición geológica de primer orden en el valle del río Maipo, ha sido interpretada geológicamente mediante una integración de la geología de superficie, información magnética y gravimétrica regional, y 42 sondajes magnetotelúricos organizados en dos perfiles de dirección norte-sur. La Anomalía Melipilla responde a la presencia de un cuerpo tabular no magnético, dispuesto en forma subhorizontal en niveles intermedios de la corteza superior (~4-6 km), e inmerso en un batolito presumiblemente jurásico y fuertemente magnético (k ~0,01 cgs).

Tema: general: 

• Ciencias›Geología

Full tungsten and platinum nanoprobes for electrically conducting scanning probe methods

REA Auditado

Recently electrically conducting SPM probes were used as read/write sensor of magneto-resistive nanopillars and ferroelectric domains in the development of >1 Tb/inch2 data storage. Since metal coated (platinum (Pt) or Pt/iridium) silicon (Si) probes are not suitable at high current densities, probes with an entire metallic tip form a solution. We present the fabrication and characterisation of hybrid SPM probes with fully metallic cantilever and tip. One method is based on a backside opening etch in KOH solution. The other method uses a dry under-etch probe release.

Tema: general: 

• Ciencias

Formulación de una ecuación para predecir la masa grasa corporal a partir de bioimpedanciometría en adultos en un amplio rango de edad e índice de masa corporal

REA Auditado

Background: Bioelectrical impedance (BIA) has a good correlation and agreement with reference techniques, such as dual energy X-ray absorptiometry (DEXA), to assess body composition. Aim: To develop and assess the concordance of an equation to predict body fat mass derived from anthropometric data, gender, age and resistance obtained from bioelectrical impedance in adults, using DEXA as the reference method. Patients and Methods: Cross-sectional study of 62 women and 59 men aged 18 to 64 years with a body mass index ranging from 18.5 to 34.8 kg/ m².

Tema: general: 

• Ciencias de la Salud›Medicina›Medicina (en General)

Evaluation of a novel real-time PCR test based on the ssrAgene for the identification of group B streptococci in vaginal swabs

REA Auditado

Abstract Background Despite the implementation of prevention guidelines, early-onset group B streptococci (GBS) disease remains a cause of neonatal morbidity and mortality worldwide. Strategies to identify women who are at risk of transmitting GBS to their infant and the administration of intrapartum antibiotics have greatly reduced the incidence of neonatal GBS disease.

Tema: general: 

• Ciencias de la Salud›Medicina

Full platinum nanoprobes for electrically conducting scanning probe methods

REA Auditado

Recently electrically conducting SPM probes were used as read/write sensor of magneto-resistive nanopillars and ferroelectric domains in the development of >1 Tb/inch2 data storage. Since metal coated (platinum (Pt) or Pt/iridium) silicon (Si) probes are not suitable at high current densities, probes with an entire metallic tip and high electrical conductivity (i.e. low contact resistance) form a solution. We present the fabrication and characterization of hybrid SPM probes with full metallic cantilever and tip. The body of the probes consists of the photopolymer SU-8.

Tema: general: 

• Ciencias

The role of cervical Electrical Impedance Spectroscopy in the prediction of the course and outcome of induced labour

REA Auditado

Abstract Background Previous work by us and others had suggested that cervical electrical impedance spectroscopy (EIS) may be predictive of the outcome of induced labour.

Tema: general: 

• Ciencias de la Salud›Medicina

Tailored antiplatelet therapy can overcome clopidogrel and aspirin resistance - The BOchum CLopidogrel and Aspirin Plan (BOCLA-Plan) to improve antiplatelet therapy

REA Auditado

Abstract Background Dual antiplatelet therapy using acetylsalicylic acid (ASA, aspirin) and clopidogrel is of great importance following coronary stenting. However, the variable platelet inhibitory effectiveness compromises the antithrombotic advantages provided by dual antiplatelet therapy.

Tema: general: 

• Ciencias de la Salud›Medicina