Comparison of catalyst activity

Reactions of highly active catalysts are compared by allowing temperature of catalyst bed, initially at 77 K, to increase slowly; marked deviation in smooth warming curve denotes temperature at which detectable reaction occurs. The lower the temperature at which reaction commences, the more active the catalyst

A List of Cestode Parasites from California Mammals

This report brings together information on the occurrence and distribution of cestode parasites in California mammals. The original information reported herein, was obtained by students, myself, and other staff members of this university. Although the host-parasite list which follows is far from complete, the dearth of knowledge about the helminth fauna in California seems to justify the publication of relatively few data, in the hope that other workers will be able to use this list as a starting point and add to it. With few exceptions, the common names of the hosts, as given in the host list, were obtained from Burt and Grossenheider (1952). The keys and descriptions in Wardle and McLeod (1952) were of great help in identification of many of the cestode species. In the parasite list, new locality records within the state, as well as first reports for the state, are indicated by an asterisk after the locality in question

Low temperature catalytic ignition of hydrogen and oxygen

Catalyst composed of 32 percent iridium metal supported on granular alumina is most active and most stable of platinum metal catalysts. Catalyst consistently induces reactions at temperatures as low as 78 K

Searches for Neutrinos from Supernovae Using Cherenkov In-Ice Detectors

Supernovae mark the violent death of massive stars. They are among the most energetic processes known to exist in the Universe. Neutrinos play crucial roles in supernova processes. Besides the low-energy neutrinos emitted during the core-collapse process of the supernova, there may be neutrinos of much higher energies that are generated after the core-collapse. In this work, a new detector embedded in Antarctic glacier ice is studied, with sensitivity to extra-galactic supernova low-energy neutrino bursts. It is demonstrated that the development of optical sensors with large effective area and low noise rate is a requirement. For the proposed detector, several extra-galactic supernova neutrino detections per year are feasible. In addition, a multi-messenger data analysis program is carried out, which registers high-energy neutrino bursts with the IceCube detector and triggers follow-up observations with optical telescopes. No significant excess of neutrino bursts is found. Therefore, upper limits on the jet supernova model are derived. For model values of the jet Lorentz factor Γjet = 10 and the jet kinetic energy Ejet = 3 × 1051 erg, only about 8% of all core-collapse supernovae hosting a jet are consistent with the data.Suche nach Supernova-Neutrinos mit Cherenkov-Detektoren in Eis Supernovae sind gewaltige Explosionen am Lebensende massereicher Sterne. Sie gehören zu den energiereichsten bekannten Prozessen im Universum. Neutrinos spielen entscheidende Rollen während und nach Supernova-Explosionen. Neben den niederenergetischen Neutrinos, die während des Kernkollapsprozesses der Supernova emittiert werden, könnten Neutrinos von sehr viel höherer Energie nach dem Kernkollaps enstehen. In dieser Arbeit wird ein neues Detektorkonzept untersucht, mit Sensitivität für extragalaktische niederenergetische Supernova-Neutrino-Blitze. Die Notwendigkeit der Entwicklung optischer Sensoren mit großer effektiver Fläche und niedriger Rauschrate wird aufgezeigt. Der untersuchte Detektor könnte mehrere extra-galaktische Supernova-Neutrino-Detektionen pro Jahr liefern. Weiter wird ein multi-messenger Datenanalyseprogramm durchgeführt, welches hochenergetische Neutrinoblitze mit dem IceCube-Detektor registriert und automatisch Nachfolgebeobachtungen mit optischen Teleskopen auslöst. Kein signifikanter Exzess von Neutrino-Blitzen wird gefunden. Entsprechend werden obere Grenzen auf das Jet-Supernova-Modell berechnet. Für die Modellparameter Lorentzfaktor Γjet = 10 und kinetische Energie des Jets Ejet = 3 × 1051 erg sind höchstens etwa 8% aller Kernkollaps-Supernovae als Träger eines solchen Jets mit den Daten verträglich

Optical guidance vidicon test program

A laboratory and field test program was conducted to quantify the optical navigation parameters of the Mariner vidicons. A scene simulator and a camera were designed and built for vidicon tests under a wide variety of conditions. Laboratory tests characterized error sources important to the optical navigation process and field tests verified star sensitivity and characterized comet optical guidance parameters. The equipment, tests and data reduction techniques used are described. Key test results are listed. A substantial increase in the understanding of the use of selenium vidicons as detectors for spacecraft optical guidance was achieved, indicating a reduction in residual offset errors by a factor of two to four to the single pixel level

The colloidal properties of human serum: with special reference to the changes that take place in syphilis

It is well known that as a result of syphilitic infection various changes occur in blood sera, and that for the detection of these changes several reactions have been elaborated some of which are of great clinical importance. Of these the complement fixation test commonly known as the Wassermann reaction is of particular significance.This test which need not be described in detail depends on the fact that when an antigen consisting of an alcoholic extract of tissue particularly heart or liver added to physiological saline solution,is mixed with syphilitic serum containing complement,part or all of the complement is fixed or inactivated in such a way that it is unable to effect haemolysis of sensitised red blood cells

Development of Hydrogen-Oxygen Catalysts Final Report

Catalysts of improved activity and thermal stability for low temperature ignition of oxygen- hydrogen mixtur