An electronic water-depth measuring and recording system is described, which scans transducers hourly with exceptional depth and time accuracy. Transducer design is simple and rugged. Cable lengths between transducers and recorder are not critical. The system, which has performed reliably for several storm seasons in coastal Alaska, requires very little power and operates from a battery supply for extended periods. This design has proven cost-effective for continuous monitoring of well water levels and could easily be adapted for measuring rainfall and streamflow.

Employing a neutral kaon beam at the Argonne Zero Gradient Synchrotron, a high-resolution magnetic spectrometer, and a neutron detector, differential cross sections have been obtained in the forward direction [$0.045<|t|<0.18$ ${(\mathrm{G}\mathrm{e}\mathrm{V}/\mathit{c})}^{2}$] for the reaction ${K}_{L}^{0}p\ensuremath{\rightarrow}{K}^{+}n$. Previous studies of the time-reversed process in deuterium, ${K}^{+}d\ensuremath{\rightarrow}{K}^{0}p(p)$, have not yielded direct cross-section measurements in the forward direction because there is an inhibition of the non-spin-flip process in deuterium due to the Pauli exclusion principle. Nevertheless, our data are in agreement with the extracted free-neutron cross sections of deuterium studies as determined from the impulse and closure approximations.

Five distinct types of stomatitis for which the denture is the primary causative agent have been described. The etiology of each has been discussed, and a protocol of clinical management has been recommended. The fact that these inflammations are seen almost daily in a busy practice underscores the importance of periodic maintenance of any oral prosthesis. This emphasizes the advantages which derive from an efficiently administered recall system.

The absolute efficiency of a plastic scintillator neutron counter has been measured as a function of bias at thirteen neutron energies between 1.0 and 200 MeV, using two techniques: above 4 MeV, protons from free np charge exchange were used to tag a neutron beam, while below 4 MeV the tagged neutrons came from a 252Cf fission source. Data is available for biases between 0.20 and 4.0 MeV electron equivalent. A Monte Carlo program was written to interpolate the measurements to different neutron energies and extend them to other counter geometries. A comparison of the results of the program with our measurements and those of others is presented.

The design and performance of an array of plastic scintillator neutron counters are discussed. The array uses counters of three sizes to detect neutrons of 1.0 to 450 MeV, measuring their energy by time-of-flight and their production angles by counter identification and end-to-end timing. Information from 180 000 neutron-proton charge exchange events is used to investigate the resolution stability and internal consistency of the system. Neutron pulse height distributions for narrow bins of neutron energy between 1.25 and 313 MeV are presented and compared with the predictions of a Monte Carlo program.

We report a high-statistics measurement of the neutron-proton charge-exchange differential cross section for incident momenta 3 to $12 \frac{\mathrm{GeV}}{c}$, and four-momentum transfers 0.003 to $0.85 {(\frac{\mathrm{GeV}}{c})}^{2}$. The data are normalized absolutely to \ifmmode\pm\else\textpm\fi{}20%. The differential cross section is characterized by a sharp peak at small momentum transfers, with a gentler exponential behavior at large momentum transfers. This shape is remarkably independent of the incident momentum.