摘要:

Heat shrinkable tubing provides a new way of mounting optical windows on systems that is simple and quick and permits fast and easy removal.

ISSN:0034-6748    

DOI:10.1063/1.1134363

出版商:AIP    

年代:1975

数据来源: AIP

摘要:

A simple shock‐wave detector for use in shock tube experiments is presented. The detector consists of a thin metal diaphragm and an electrode which contact upon arrival of the shock‐wave pressure step.

ISSN:0034-6748    

DOI:10.1063/1.1134364

出版商:AIP    

年代:1975

数据来源: AIP

摘要:

A linear, liquid‐resistivity meter circuit is described that operates by charging and discharging a capacitor through a cell in which the liquid is included, rendering no dc component across it. The resulting oscillating waveform is shown to have a period proportional to the cell resistance. A period–voltage converter is added in order to indicate the resistance on a moving coil instrument. The system’s dc supply and low consumption permit easy battery operation.

ISSN:0034-6748    

DOI:10.1063/1.1134365

出版商:AIP    

年代:1975

数据来源: AIP

摘要:

Pole‐zero cancellation was applied to the feedback circuit of wide‐band preamplifiers to improve the baseline stability and reduce the saturation of the output for high count rates (106counts/sec) or large output signals (≳1 V), without compromising the bias point stabilization.

ISSN:0034-6748    

DOI:10.1063/1.1134366

出版商:AIP    

年代:1975

数据来源: AIP

摘要:

A description is given of an inexpensive tungsten boat evaporation source which is easily made in the laboratory.

ISSN:0034-6748    

DOI:10.1063/1.1134367

出版商:AIP    

年代:1975

数据来源: AIP

摘要:

An electromagnetic levitation apparatus incorporating an electron beam for auxiliary heating and melting has been developed for experiments on containerless vacuum purification and undercooled solidification of high melting materials. Stable levitation of 10‐g specimens of molten tungsten has been achieved and a variety of containerless solidification experiments is being performed, including pure polycrystalline castings and single tungsten crystals grown from the undercooled levitated melts.

ISSN:0034-6748    

DOI:10.1063/1.1134368

出版商:AIP    

年代:1975

数据来源: AIP

摘要:

A new bonding process is described which is suitable for applying electrodes to the external surfaces of spacecraft and sounding rockets. A polyimide material containing small, uniform glass spheres provides the necessary insulation and mechanical strength. The bonded electrodes are simple to construct and are shown to have good electrical, vacuum, and thermal properties.

ISSN:0034-6748    

DOI:10.1063/1.1134369

出版商:AIP    

年代:1975

数据来源: AIP

摘要:

A technique is described for making four probe conductivity measurements on small, fragile single crystals of organic compounds. Physical constraint of the sample is minimal, allowing repeated thermal cycling.

ISSN:0034-6748    

DOI:10.1063/1.1134370

出版商:AIP    

年代:1975

数据来源: AIP

摘要:

We describe the design of a simple and inexpensive system for transferring liquid nitrogen from one container to another.

ISSN:0034-6748    

DOI:10.1063/1.1134371

出版商:AIP    

年代:1975

数据来源: AIP

摘要:

The circuit described is capable of generating high‐current (2–50 A), fast‐rise‐time (10 nsec), square‐wave pulses into a 50‐&OHgr; load. This circuit may be used for driving injection lasers at high repetition rates (up to 1.5 kHz) when connected to coaxial cables.

ISSN:0034-6748    

DOI:10.1063/1.1134372

出版商:AIP    

年代:1975

数据来源: AIP