Rev Sci Instrum Research Articles

New wide band windowless photon detector: J J Grodsky and B W Schumacher,Rev Sci Instrum, 39 (5), 1968, 702–709.

New wide band windowless photon detector: J J Grodsky and B W Schumacher,Rev Sci Instrum, 39 (5), 1968, 702–709.

High vacuum valve for use in cryostats: P D Neufeld et al, Rev Sci Instrum, 39 (5), 1968, 771–772.

High vacuum valve for use in cryostats: P D Neufeld et al, Rev Sci Instrum, 39 (5), 1968, 771–772.

Improved vacuum system for electron microscopes: A R Taylor et al, Rev Sci Instrum, 39 (5), 1968, 780–781.

Improved vacuum system for electron microscopes: A R Taylor et al, Rev Sci Instrum, 39 (5), 1968, 780–781.

Simple liquid helium pressure transducer: M Chester et al, Rev Sci Instrum, 39 (5), 1968, 719–722.

Simple liquid helium pressure transducer: M Chester et al, Rev Sci Instrum, 39 (5), 1968, 719–722.

High vacuum feedthrough for rotational and translational motion: C S Parmenter and M W Schuyler, Rev Sci Instrum, 39 (4), 1968, 611.

High vacuum feedthrough for rotational and translational motion: C S Parmenter and M W Schuyler, Rev Sci Instrum, 39 (4), 1968, 611.

High voltage coaxial connector for helium cryostals: W G Clark, Rev Sci Instrum, 39 (4), 1968, 601–602.

High voltage coaxial connector for helium cryostals: W G Clark, Rev Sci Instrum, 39 (4), 1968, 601–602.

Experimental automatic recording dilatometer for thermal expansion and shrinkage studies over the temperature range — 150 to 1500°C: H A Sauer, Rev Sci Instrum, 39 (4), 1968, 562–565.

Experimental automatic recording dilatometer for thermal expansion and shrinkage studies over the temperature range — 150 to 1500°C: H A Sauer, Rev Sci Instrum, 39 (4), 1968, 562–565.

Fabrication of ultrathin films: P Vouros et al, Rev Sci Instrum, 39 (5), 1968, 741–743.

Fabrication of ultrathin films: P Vouros et al, Rev Sci Instrum, 39 (5), 1968, 741–743.

Thermal expansion of epoxies between 2 and 300°K: W O Hamilton et al,Rev Sci Instrum, 39 (5), 1968, 645–648.

Thermal expansion of epoxies between 2 and 300°K: W O Hamilton et al,Rev Sci Instrum, 39 (5), 1968, 645–648.

1320. Technique for producing extremely thin walls and small holes in glass tubing: H F Wellenstein et al, Rev Sci Instrum, 39 (3), 1968, 410–411

Leaching experiments were conducted in a greenhouse to simulate seawater leaching combined with alternating seawater inundation and air drying. We investigated the heavy metal release of soils caused by changes associated with seawater inundation/air drying cycles in the reclaimed soils. After the treatment, the contents of all heavy metals (Cd, Pb, Cr, and Cu), except Zn, in surface soil significantly decreased (P < 0.05), with removal rates ranging from 10% to 51%. The amounts of the exchangeable, carbonate, reducible, and oxidizable fractions also significantly decreased (P < 0.05). Moreover, prolonged seawater inundation enhanced the release of heavy metals. Measurement of diffusive gradients in thin films indicated that seawater inundation significantly increased the re-mobility of heavy metals. During seawater inundation, iron oxide reduction induced the release of heavy metals in the reducible fraction. Decomposition of organic matter, and complexation with dissolved organic carbon decreased the amount of heavy metals in the oxidizable fraction. Furthermore, complexation of chloride ions and competition of cations during seawater inundation and/or leaching decreased the levels of heavy metals in the exchangeable fraction. By contrast, air drying significantly enhanced the concentration of heavy metals in the exchangeable fraction. Therefore, the removal of heavy metals in the exchangeable fraction can be enhanced during subsequent leaching with seawater.

1280. Modification of a time-of-flight mass spectrometer for investigation of ion-molecule reactions at elevated pressures: J H Futrell et al,Rev Sci Instrum, 39 (3), 1968, 340–345

1280. Modification of a time-of-flight mass spectrometer for investigation of ion-molecule reactions at elevated pressures: J H Futrell et al,Rev Sci Instrum, 39 (3), 1968, 340–345

1257. Cryostat for thermal measurements between 2–300°K: J Bigeleisen et al, Rev Sci Instrum, 39 (3), 1968, 353–356

1257. Cryostat for thermal measurements between 2–300°K: J Bigeleisen et al, Rev Sci Instrum, 39 (3), 1968, 353–356

1291. Liquid helium field-ion microscope for radiation damage investigation: P Petroff and J Washburn,Rev Sci Instrum, 39 (3), 1968, 317–319

Focusing-imaging, dispersive and aberration performances of Wien filters have been studied. The first order chromatic aberration and second order geometric aberration coefficients for Wien filters not satisfying the stigmatic focusing condition have been derived. An aberration correction method has been proposed using the symmetry of fields and fundamental paraxial rays to correct all the second order aberrations. A design of an energy-selective imaging system using the symmetry and consisting of four identical cascading Wien filters with an octupole electrical magnetic structure is described, and the imaging properties of the energy-selective imaging system has been computed.

1251. Combined leak detector and high sensitivity vacuum gauge: G D Perkins and C F Robinson, Rev Sci Instrum, 39 (3), 1968, 361– 362

1251. Combined leak detector and high sensitivity vacuum gauge: G D Perkins and C F Robinson, Rev Sci Instrum, 39 (3), 1968, 361– 362

1261. Rapid method for preparing single stage carbon replicas for electron microscopy of some mineral crystals: A R Patel and S M Patel, Rev Sci Instrum, 39 (3), 1968, 409–410

1261. Rapid method for preparing single stage carbon replicas for electron microscopy of some mineral crystals: A R Patel and S M Patel, Rev Sci Instrum, 39 (3), 1968, 409–410

845. Construction of Vycor glass superleaks: M F Wilson et al, Rev sci instrum, 39 (1), 1968, 134.

845. Construction of Vycor glass superleaks: M F Wilson et al, Rev sci instrum, 39 (1), 1968, 134.

878. Vacuum diode detector for measuring high intensity gamma-ray flux: P J Ebert and A F Lauzon, Rev sci instrum, 38 (12), 1967, 1747–1752.

878. Vacuum diode detector for measuring high intensity gamma-ray flux: P J Ebert and A F Lauzon, Rev sci instrum, 38 (12), 1967, 1747–1752.

889. Helium vapour cooled current leads: K R Efferson, Rev Sci Instrum, 38 (12), 1967, 1776–1779

889. Helium vapour cooled current leads: K R Efferson, Rev Sci Instrum, 38 (12), 1967, 1776–1779

855. Highly reflective, adherent, thick aluminium films on glass: E L Bahm et al, Rev sci instrum, 39 (1), 1968, 125–126.

855. Highly reflective, adherent, thick aluminium films on glass: E L Bahm et al, Rev sci instrum, 39 (1), 1968, 125–126.

890. Medium-sensitivity microbalances for measuring forces exerted by molecular beams: D G H Marsden, Rev Sci Instrum, 39 (1), 1968, 39–42

890. Medium-sensitivity microbalances for measuring forces exerted by molecular beams: D G H Marsden, Rev Sci Instrum, 39 (1), 1968, 39–42