摘要:

An O‐ring vacuum seal is made around a small hole in the wall of a circular tube by using a groove that is machined in a flat copper disk, which is then pressed to the curvature of the tube.

ISSN:0034-6748    

DOI:10.1063/1.1686053

出版商:AIP    

年代:1973

数据来源: AIP

摘要:

We present an extension of the filling factor for NMR spectrometers with two coils. We calculate the induced flux in the receiving coil and we show that it is possible to separate dimensionless factors which are filling factors.

ISSN:0034-6748    

DOI:10.1063/1.1686054

出版商:AIP    

年代:1973

数据来源: AIP

摘要:

A technique is described for improving the angular resolution of the Ortec 3701 B positioning mechanism by one order of magnitude. This technique extends the original resolution to an angular resolution of 0.01°.

ISSN:0034-6748    

DOI:10.1063/1.1686055

出版商:AIP    

年代:1973

数据来源: AIP

摘要:

A multichannel microspectrofluorometer based on an electron bombardment silicon camera tube, a multiscaling computer, and a miniature Amici prism for spectrometer, allows the scanning of the NAD(P)H fluorescence emission spectrum from a 30 &mgr; region in a single living EL2 ascites cancer cell, within 32 msec. Observations of changes in the relative maximum emission intensities of two fluorochromes within a same cell are quite possible (for emission maxima ∼ 10–20 nm apart). Thus, in the fluorescence emission spectrum of cells incubated with benzpyrene or dibenzanthracene, the 423 nm (polycyclic hydrocarbon)/443 nm [NAD(P)H] ratio is 1.25 or over, while it decreases to 1.0 or less upon microelectrophoretic addition of glucose‐6‐phosphate [NAD(P) reduction].

ISSN:0034-6748    

DOI:10.1063/1.1686056

出版商:AIP    

年代:1973

数据来源: AIP

摘要:

A simple, purely electrical technique for determining the responsivity of a bolometer detection system is presented. This technique is easy to use and allows the system to be calibrated under actual operating conditions.

ISSN:0034-6748    

DOI:10.1063/1.1686057

出版商:AIP    

年代:1973

数据来源: AIP

摘要:

A chemical etching method is described to improve the speed and ultimate vacuum of sputter ion pumps. The entire pump is immersed in strong acid solution in order to avoid the difficult and unnecessary task of disassembly recommended by the manufacturers.

ISSN:0034-6748    

DOI:10.1063/1.1686058

出版商:AIP    

年代:1973

数据来源: AIP

摘要:

We present a dilatometer and an apparatus which automatically records the height of the mercury column as a function of time. The precision on changes of 30 cm in height may attain ± 0.007cm. The stability of the electrical circuitry is such that measurements may span over several weeks. The measurement is based on electrical conductivity. An application is reported.

ISSN:0034-6748    

DOI:10.1063/1.1686059

出版商:AIP    

年代:1973

数据来源: AIP

摘要:

A device is described which permits the transformation of a plate prism spectrograph into a photoelectric scanning monochromator. A movable slit followed by a photomultiplier tube, which drives anx‐yplotter, makes possible the direct recording of the spectrum.

ISSN:0034-6748    

DOI:10.1063/1.1686060

出版商:AIP    

年代:1973

数据来源: AIP

摘要:

A modified InSb Hall plate for measuring magnetic fields at low temperatures is described. The quantum de Haas‐Shubnikov oscillations of the Hall voltage are suppressed by heating the semiconducting plate inserted in a ceramic cover.

ISSN:0034-6748    

DOI:10.1063/1.1686061

出版商:AIP    

年代:1973

数据来源: AIP