摘要:

Thin sheets of flowing water, up to 10 cm2and 0.01–0.05 cm thick, were produced and investigated under reduced ambient pressures down to the natural vapor pressure. Their behavior was well represented by Taylor's theory. Measurements were made of the sheet thickness, and a schlieren system was used to estimate thickness variations, which could be limited to about 1% over areas of a few cm2. Preliminary studies were also made with jets and sheets of liquid oxygen under reduced pressures. A practical water target is described for time of flight measurements on the reaction16O(p,n)16F with 30 and 50 MeV protons. It is pointed out that such targets sometimes have advantages over gaseous, solid, and conventional liquid targets, particularly with regard to defined geometry, low background, single nuclear species, and ability to be used with high beam intensities.

ISSN:0034-6748    

DOI:10.1063/1.1720114

出版商:AIP    

年代:1966

数据来源: AIP

摘要:

A stopped flow apparatus employing a rapid scanning monochromator is described. This system is thermostatted and uses Pyrex mixing cells. The monochromator permits rapid study of changes in the spectrum for suitable moderately fast reactions. The instrument is double beam and direct reading in absorbance units. Data are stored on an FM tape recorder and played back to an oscilloscope. Tests of the instrument's performance are given, and several possible applications are discussed.

ISSN:0034-6748    

DOI:10.1063/1.1720115

出版商:AIP    

年代:1966

数据来源: AIP

摘要:

The determination of the orientation of the spin axis of a spherical free gyroscope (i.e., electrostatic, low temperature, etc.) is usually performed optically by making use of some sort of pattern or marking on the rotor. This requires that the rotor have a preferred axis of rotation so that the relative orientation of the spin axis and pattern are known. This paper describes a method of ``attaching'' the pattern to the spin axis by making use of a phosphorescent coating on the rotor. This technique has the advantage of allowing the rotor to be manufactured as spherical as possible in order to eliminate torques caused by nonsphericity, while still having the capability of high accuracy readout.

ISSN:0034-6748    

DOI:10.1063/1.1720116

出版商:AIP    

年代:1966

数据来源: AIP

摘要:

An alternative to the Marx circuit for the production of high voltage, high current pulses is developed. It employs a water‐immersed spiral‐wound stepup transformer to go from a capacitor bank charged to 100 kV to an output of 1 MV. A method for using such a transformer to pulse charge a second capacitor bank efficiently without very tight coupling is derived. It is shown that for total transfer of energy (except for dissipation) the two resonant frequencies of the primary and secondary LC circuits (each measured with the other circuit open) should be equal, while the two normal mode frequencies of the coupled circuit should be in the ratio of 2:1, implying a coupling coefficient of 3/5. The design and operation of such a system is described.

ISSN:0034-6748    

DOI:10.1063/1.1720117

出版商:AIP    

年代:1966

数据来源: AIP

摘要:

A stopped flow apparatus for studying moderate rate reactions under anaerobic conditions is presented. The apparatus is described and some of its characteristics are given.

ISSN:0034-6748    

DOI:10.1063/1.1720118

出版商:AIP    

年代:1966

数据来源: AIP

摘要:

The design and operation of a twin liquid metal solution calorimeter of the Calvet type for use up to 1173°K is described. The calorimeter is well‐suited for the study of alloys containing transition elements. A means of automatically recording the data is described. The satisfactory performance of the calorimeter has been demonstrated by a determination of the heats of solution of the noble metals and of palladium in liquid tin at 698°K. The results are in good agreement with existing data.

ISSN:0034-6748    

DOI:10.1063/1.1720119

出版商:AIP    

年代:1966

数据来源: AIP

摘要:

A simple method for determination of plasma frequency is described, utilizing the cutoff effect of a plasma near electron cyclotron resonance. This determination can be made visually or by use of a microwave bridge.

ISSN:0034-6748    

DOI:10.1063/1.1720120

出版商:AIP    

年代:1966

数据来源: AIP

摘要:

A specimen holder which permits annealing experiments to be carried out after deuteron bombardment at liquid He temperature is described. Utilizing the heat capacity of He gas results in lower He consumption and improved temperature regulation. For any temperature between 15 and 300°K, the temperature regulation is ±0.01°K or better. Details of the mounting of specimens are included in this report.

ISSN:0034-6748    

DOI:10.1063/1.1720121

出版商:AIP    

年代:1966

数据来源: AIP

摘要:

A vibrating coil type magnetometer is described for measuring magnetization curves of small specimens in the magnetic cooling range of temperature. For a 3 mm diam sphere the sensitivity of magnetic moment measurements is 10−6emu. At this sensitivity the amplitude of vibration is 0.5 mm, and at 0.3°K the extra heat influx into the sample thereby introduced is less than 10 erg/min. Examples of magnetization curves are shown.

ISSN:0034-6748    

DOI:10.1063/1.1720122

出版商:AIP    

年代:1966

数据来源: AIP

摘要:

A gamma‐ray dosimeter, which has a response expressible in roentgens and high sensitivity with a small active volume, is described. The major parts of this dosimeter (gamma‐ray pulse dosimeter) are a scintillation counter using an organic scintillator and an electronic integrator, with special care to reduce the counting loss. This dosimeter is sensitive to x or gamma rays with energies above 50 keV, and has an air equivalent response for energies above 200 keV with maximum response at 80 keV (+14%). A linear temperature dependence (0.5%/°C) is obtained under 40°C.

ISSN:0034-6748    

DOI:10.1063/1.1720123

出版商:AIP    

年代:1966

数据来源: AIP