摘要:

A derivation is presented of equations which can be used in the design of high pressure apparatus utilizing multiring support. The use of these equations is illustrated by the design calculation for a multi‐ring apparatus known as the anvil assembly. The particular assembly described uses three rings for external support. This assembly is capable of developing average pressures of 160 000 atm for minimum periods of two weeks. The methods and materials used in the fabrication of the assembly are also presented.

ISSN:0034-6748    

DOI:10.1063/1.1717506

出版商:AIP    

年代:1961

数据来源: AIP

摘要:

The Tensimeter was developed to meet the need for a more dependable laboratory vacuum gauge which would be useful over the range of pressures from atmospheric down to a fraction of a millimeter of Hg absolute. The principle of operation involves using the boiling point of a pure compound as a measure of the pressure of the connected system. A description and calibration data are included. The advantages of the Tensimeter arise from the fact that it tolerates atmospheric water vapor which is usually present in petroleum distillations and causes other gauges to read incorrectly. It is small and convenient to use and does not require recalibration. It also produces an electrical signal which can be used for recording and control of subatmospheric pressures.

ISSN:0034-6748    

DOI:10.1063/1.1717507

出版商:AIP    

年代:1961

数据来源: AIP

摘要:

The microwave mobility in a semiconductor can be obtained by mounting a sample in a bimodal cavity with an applied static magnetic field and then measuring the power transfer which is produced by the Faraday rotation in the sample. This paper gives an analysis of the effect based on the field distributions in the cavity and the wave propagation in the sample. The dependence of the power transfer on the static applied magnetic field, on the mobility and conductivity of the sample, and on an effective sample size is obtained.

ISSN:0034-6748    

DOI:10.1063/1.1717508

出版商:AIP    

年代:1961

数据来源: AIP

摘要:

Hall mobilities of germanium single crystals have been measured at a frequency of 9000 Mc over the temperature range 30°–300°K. A rectangular sample occupied the central part of a wall of a rectangular cavity, which was doubly degenerate in the TE101mode and in the TE011mode at a single resonance microwave frequency. The external magnetic field and the microwave field associated with one of the two modes gave rise to the other mode of oscillation. The theoretical analysis by Liu, Nishina, and Good was verified by measurements on an n‐type sample having a room temperature resistivity of 0.40 ohm cm. The measured Hall mobility at microwave frequencies (with a size correction) was compared with the dc Hall mobility between 30°K and 300°K. The agreement was excellent.

ISSN:0034-6748    

DOI:10.1063/1.1717509

出版商:AIP    

年代:1961

数据来源: AIP

摘要:

By means of a compact graphite apparatus, modulus of rupture may now be determined at temperatures in excess of 2350°C. The design is such that the apparatus may be used in any furnace with a hot zone 4 in. in diameter by 6 in. high, protected by an inert atmosphere.

ISSN:0034-6748    

DOI:10.1063/1.1717510

出版商:AIP    

年代:1961

数据来源: AIP

摘要:

A special five‐section nuclear magnetic resonance probe was developed to facilitate the alignment of precision laboratory electromagnets. A description of the probe and its associated equipment is given along with a discussion of the actual use of the system to obtain detailed information about the magnetic field symmetry of a particular electromagnet. A discussion of accuracies obtainable with the probe is also included.

ISSN:0034-6748    

DOI:10.1063/1.1717511

出版商:AIP    

年代:1961

数据来源: AIP

摘要:

Furnaces which can be readily installed or removed from the sample and reference compartments of an unmodified Cary model 14 spectrophotometer are described in some detail. Heat requirements to 800°C are given for these units.

ISSN:0034-6748    

DOI:10.1063/1.1717512

出版商:AIP    

年代:1961

数据来源: AIP

摘要:

A filter lens of improved characteristics obtained by use of an intermediate image is described. The design has the advantage of longer focus and increased aperture while maintaining an energy resolution, at 5‐kev primary energy, of less than thermal spread of the initial beam.

ISSN:0034-6748    

DOI:10.1063/1.1717513

出版商:AIP    

年代:1961

数据来源: AIP

摘要:

A description is given of a pulse amplifier whose output voltage can be accurately controlled by the setting of a ten‐turn potentiometer. The output amplitude and pulse lengths are variable up to 1000 v, 2.6 amp, and 10 &mgr;sec, respectively. An accuracy of 2 v is achieved, independently of external conditions, by the use of strong negative feedback to compare the output with a reference dc voltage. The various sources of error are discussed.

ISSN:0034-6748    

DOI:10.1063/1.1717514

出版商:AIP    

年代:1961

数据来源: AIP

摘要:

A demountable solderless all‐metal valve suitable for ultra‐high vacuum applications is described. A gasketed stainless steel diaphragm transmits the motion. Valves of several sizes have been constructed. One modification is useful for providing a straight path for passage of a beam of particles or light between chambers which it may be necessary to evacuate separately. A pair of valves in a common block may be used to provide a convenient, accurate metering volume. A group of valves machined from a single block may form a complete manifold. The basic mechanism has also been employed for transmitting motion in a high vacuum system as for adjusting a slit.

ISSN:0034-6748    

DOI:10.1063/1.1717515

出版商:AIP    

年代:1961

数据来源: AIP