Activity of Ni-Moly catalysts in tetralin or decalin dehydrogenation and in hydrogenation of coal-extract solution

The activity of several NiMoly catalysts in the processes of dehydrogenation of tetralin or decalin and hydrogenation of coal-extract solution has been determined. In both processes studied, the activities of the catalysts investigated have been found to follow rectilinear relations with quantity. It has also been shown that the activity of a NiMoly catalyst can be predicted in hydrogenation of coal-extract solution, from its activity in dehydrogenation of tetralin or decalin; the latter reaction is relatively simple to conduct in laboratory conditions. However, caution must be exercised when very narrow pores, making possible Knudsen diffusion of hydrogen at high pressure, exist in the catalyst.     

Probleme und Lösungen beim Feuchtigkeitsschutz des Mauerwerks von Baudenkmälern am Beispiel zweier großer Barockbauten in Wrocław

Problems concerning damp‐proofing brick‐laid historic building – shown on the example of two huge baroque structures in Wrozław. Most brick‐laid historic buildings in Poland are in bad technological condition due to lack of proper damp and water insulations, hence they need immediate renovation. Water is the biggest enemy of building constructions, especially of historic structures. The main source of dampness in buildings is rainwater, ground capillary water and water present in humid air, absorbed by porous, hygroscopic materials. It is a difficult task to design and later effect the correct and efficient damp‐proofing, and requires specific interdisciplinary knowledge. The article describes some chosen problems that appeared in the course of designing and making damp insulations in two huge historic priceless baroque buildings situated near the Odra River in Wrocław, namely, the main building of the University of Wrocław and the building of National Ossolinski Institute in Wrocław.     

Formation of Jets by Shaped Charges with Metal Powder Liners

The characteristics of shaped charges with metal powder liners for perforating borehole pipes are described. The liners were manufactured using powder metallurgy technology. Two types of powder liners were made: a homogeneous one made of copper powder and a heavy one made of copper and tungsten powder blend. Laminar liners consisting of two layers made from powders of different densities were also examined. X‐ray pulse technique was applied to research the process of jet stream formation. Radiograms revealed the discontinuous (discrete) structure of jets formed from powder liners. The corresponding computer simulations of jet formation are presented.     

Ba4In2−x(CO3)1+xO6−2.5x and Ba4In0.8Cu1.6(CO3)0.6O6.2—new indium oxycarbonates closely related to n=3 Ruddlesden–Popper phases

Investigations of phase relations in the Ba-rich part of the In₂O₃–BaO(CO₂)–CuO pseudo-ternary system at 900 °C have revealed the existence of new indium–copper oxycarbonate – Ba₄In_0.8Cu_1.6(CO₃)_0.6O_6.2. Rietveld refinement of the X-ray powder diffraction data combined with infrared studies gives evidence that this phase is a oxycarbonate crystallising in the tetragonal structure (space group I4/mmm) with unit cell parameters: a=4.0349(1) Å and c=29.8408(15) Å. In the binary part of the In₂O₃–BaO(CO₂) system we have identified the occurrence of Ba₄In_2−x(CO₃)_1+xO_6−2.5x oxycarbonate solid solution showing a crystal structure also described by I4/mmm space group, but with the unit cell parameters: a=4.1669(1) Å and c=29.3841(11) Å for x=1. The existence range of this phase, −0.153<x<0.4, includes chemical compositions of earlier found phases: Ba₅In_2+xO_8+0.5x with 0≤x≤0.45 (known as the -solid solution), as well as the binary Ba₄In₂O₇ phase. The crystal structures of both new oxycarbonates are isomorphic and related to n=3 member of the Ruddlesden–Popper family.     

Variations in proximate composition and fatty acid profiles of Baltic sprat (Sprattus sprattus balticus)

The variability of the proximate composition and fatty acid profiles in samples of sprat (Sprattus sprattus balticus) from the southern Baltic Sea were studied in relation to the catch season and location, individual fish size, and sex. Fatty acid profiles depended on such features as fish size and lipid content, which depend on the season of the year in which the fish were caught. No differences in fatty acid profiles were noted between the sexes in the individuals examined. Studies on fish lipids are necessary as fish lipids are important in the prevention of cardiac disease. One of the chief advantages of fish lipids that is relevant to the prevention of cardiac disease is their n−3 to n−6 fatty acid ratio. The most advantageous ratio of these fatty acids was noted in sprat that were the smallest in length.     

The role of interfacial energy in the wear of polymeric journal bearings

Experimental and theoretical relationships between the adhesional energy and the wear rate of a polymer, in the form of a miniature journal bearing for a steel shaft, are presented. Formulae are derived that can be used to predict the wear rate of a polymeric material in such bearings.     

Z-bunionectomy: retrospective long-term study

Long-term patient satisfaction and objective clinical and radiographic examinations of patients who had undergone the Z-bunionectomy at the University of Chicago Medical Center were evaluated. Fifty-six surgeries were performed on 31 patients, with a follow-up range of 5 to 9 years. The University of Maryland 100-Point Painful Foot Center Scoring System was modified to be more specific to bunion surgery, and we used this modification to measure patient satisfaction. Patient satisfaction was rated good to excellent by 90% of the patients. Radiographic findings included: intermetatarsal angle-mean, 7.1 degrees; hallux abductus angle-mean, 8.96 degrees; tibial sesamoid position-mean, 2.8. The mean protrusion was -1.64 mm. Radiographic findings consistent with osteonecrosis were noted of one patient, one foot, although the patient was clinically asymptomatic. The objective findings were as follows: dorsiflexion, mean, 60 degrees; plantarflexion, mean, 14 degrees. No patients had pain or crepitus, nor were they tract-bound in their first metatarsophalangeal joint range of motion. In addition, stance dorsiflexion had a mean of 21 degrees, and the purchase power was 88% good to excellent on plantar paper pull-out testing. First ray motion qualitatively demonstrated 1 1/2 to 2 times dorsiflexion to plantarflexion. There were no subsecond metatarsal head keratoses. Generalized ligamentous laxity was not seen. For the resting calcaneal stance position the mean was 3.5 degrees everted, with 24% of the patients maximally pronated in this position. We were unable to correlate any structural and functional postoperative features with patient satisfaction.     

Unsuspected and pertinent microfacts in personology.

If he or she has a choice, the clinical psychologist prefers propositions that apply only to some individuals, but do so with a high degree of validity. Generalizations in personology based on group statistics apply to all members of the group studied, but they are of low validity when applied to individuals. Working with individuals the clinician prefers to say less, but with higher validity. The perceptanalytic Rorschach is a sensitive device that uncovers relevant microfacts of limited applicability but high validity. To obtain sound results one must treat the formal aspects of a response and its content as a unit. Ss must associate freely and completely unhampered. (24 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)