摘要:

A microprocessor-based controller has been developed to reorient the magnetic field gradients used in nuclear magnetic resonance zeug-matographic imaging. The principle of operation is that linear field gradients correspond to vectors, and may be generated from their orthogonal components. Under microprocessor control, the currents in the gradient coils may be manipulated to produce programmed linear field gradients with any desired magnitude and orientation. The controller has been used in two-dimensional reconstruction experiments and for sensitive point scanning, and may readily be adapted to three-dimensional imaging and to other gradient sequences.

ISSN:1073-9149    

DOI:10.1080/10739147908543456

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor

摘要:

A general-purpose interface for the PDP-11 family of minicomputers is described. The interface, oriented toward laboratory data-acquisition and experimental control applications, can be built in a relatively short time with low materials costs. A general purpose, FORTRAN-compatible software package capable of driving the interface is also discussed.

ISSN:1073-9149    

DOI:10.1080/10739147908543457

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor

摘要:

An analysis system was developed to automatically determine specific conductance on samples at the rate of 30 per hour over a range of 1-15,000 μmho/cm with a precision of 1 percent or less. The system consists of custom designed digital electronic circuitry which modifies a commercially available direct-reading conductivity meter. This modification permits automatic range switching of the meter so that measurements are made under optimum conditions.

ISSN:1073-9149    

DOI:10.1080/10739147908543458

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor

摘要:

A voltammetric technique based on hydrodynamic modulation, pulsed rotation voltammetry (PRV), has been placed under automated control by a desk-top programmable calculator. The circuitry is briefly described and the capabilities of the system are illustrated.

ISSN:1073-9149    

DOI:10.1080/10739147908543459

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor

摘要:

A computer-controlled discontinuous automatic sample dispenser (ASD) for use with a graphite braid atomizer is described. In the single sample mode it can deliver sample volumes of 1.00 to 5.00 μl in 0.05 μl increments with typical atomic absorption measurement precision ranging from 2 to 5%. In the multiple sample mode, any of six samples may be delivered with typical total measurement precisions of about 10 to 15%.

ISSN:1073-9149    

DOI:10.1080/10739147908543460

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor

摘要:

A simple gas control device is described that reduces the gas consumption for certain electrothermal atomizers considerably. This reduction is accomplished by switching the gas flow off automatically at a preselected time after each atomization step is completed.

ISSN:1073-9149    

DOI:10.1080/10739147908543461

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor

摘要:

The electronics and construction of a low cost, low noise triangle wave generator suitable for cyclic voltammetry, polarography, anodic stripping voltammetry, and other electrochemical applications are described. Components for the unit cost about S200.

ISSN:1073-9149    

DOI:10.1080/10739147908543462

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor

摘要:

The article describes the hardware and software required to interface the Varian CFT-20 NMR with a Digital Group Z80 micro-computer, thereby increasing the capability to perform spectral analyses.

ISSN:1073-9149    

DOI:10.1080/10739147908543463

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor

ISSN:1073-9149    

DOI:10.1080/10739147908543455

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor