Mechanical properties of metastable glacial till before and after water‐induced compaction     

Oliver Stock  Gregory Lesturgez  Oliver Bens  Reinhard F. Hüttl 《植物养料与土壤学杂志》2007,170(4):560-566

The mechanical properties of metastable soils have been approached from different backgrounds by civil engineers and soil scientists, with the main focus being on water‐induced self‐compaction rates. This study was conducted to determine the rebound‐recompression properties of metastable soil before and after wetting and to study the effect of water‐induced compaction on the mechanical stability depending on the overburden pressure. Rebound and recompression properties were measured with oedometer tests using sieved sandy loam, taken from a nonweathered Saalian glacial till layer, as the metastable test soil. The mechanical stability (preconsolidation load) of the dry and wetted soil was derived mathematically from recompression data after the test soil was unloaded. Void‐ratio changes during unloading and reloading were on a low level (Δe = 0.03). Rebound and recompression rates of the dry samples increased with load, whereas the void‐ratio change was twofold higher during recompression. Rebound rates of the wetted samples tended to decrease with load, while the recompression rates remained constant. Preconsolidation load calculated for the dry samples overestimated the simulated overburden pressure, whereas the wetted samples showed a high congruence. In both cases, the point of greatest curvature estimated in the earlier step of deviation gave values that were more realistic to the loads from which the unloading started. Our results indicate that both dry compaction and water‐induced compaction induce primarily plastic deformation. Furthermore, we found that in both the dry and wetted state the mechanical stability of the soil reflecting the overburden pressure remained constant.  相似文献   

The use of follicle-stimulating hormone (FSH-P) for the induction of superovulation in cattle]     

H J Reinhard  K Rohn 《DTW. Deutsche tier?rztliche Wochenschrift》1992,99(3):95-99

The clinical effectiveness of FSH-P for initiating superovulation in cattle was examined in 948 animals of the breed Deutsche Schwarzbunte and Deutsche Rotbunte of RPN Verden during 1988 and 1989. In the group of the FSH-P treated animals the number of transferable embryos was 4.4 +/- 4 per animal. The 25% percentile was 1 and the 75% percentile was 7 transferable embryos per donor. In 88 animals no embryos were found. In animals with a large number of embryos there was a changed quotient between transferable embryos and non transferable embryos per animal. A seasonal dependence in the number of transferable embryos was not found. Repeated treatment with FSH-P seemed to have no influence on the number of transferable embryos per animal. In the dose range between 6.6-9.4 mg FSH-P no differences in the number of transferable embryos per animal were found.  相似文献   

Fractionation of trypanosome antigens for species-specific sero-diagnosis     

I F Ijagbone  C Staak  R Reinhard 《Veterinary parasitology》1989,32(4):293-299

Crude somatic antigens from isolated and ultrasonically treated trypanosomes were fractionated by column chromatography. A protein-free antigenic fraction was isolated which reacted monospecifically when tested against hyperimmune sera from rabbits. The method has a potential application in the improvement of serodiagnosis of trypanosomiasis.  相似文献   

Hoof correction in foals     

F Reinhard 《Tier?rztliche Praxis》1987,15(1):43-45

The conformation of a foal's limbs is of interest beginning in the first days of life. The hoof also must not be neglected. Management and hoof care necessary for normal hoof development are discussed. In addition, pathological hoof shapes and their appropriate treatments are outlined.  相似文献   

Extrapolation of electric current hazards from the swine as an experimental animal to man     

J Jacobsen  S Buntenk?tter  H J Reinhard  H Wissdorf 《DTW. Deutsche tier?rztliche Wochenschrift》1974,81(9):214-220

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Heparin in vitro sensitivity of the activated partial thromboplastin time in canine plasma depends on reagent.     

Reinhard Mischke 《Journal of veterinary diagnostic investigation》2003,15(6):588-591

The in vitro heparin sensitivity of 6 different commercial activated partial thromboplastin time (APTT) reagents was investigated based on artificial plasma samples prepared by addition of sodium heparin at different activities (0-1.5 IU/ml) to pooled normal canine plasma. Statistical analysis using 2-way analysis of variance was based on APTT ratios (APTT/mean APTT control). Significant differences between the APTT ratios of different APTT reagents (P < 0.00001) were found, which also depended on heparin activity (interaction between the factors; P < 0.00001). For example, mean APTT ratio at 0.7 IU/ml heparin varied between 1.2 and 2.5. The results of this study indicate that recommendations for the control of heparin therapy in dogs by APTT ratio should be reagent specific.  相似文献   

Electromyographic studies on healthy pigs and pigs with protracted atrophy of the posterior femoral musculature     

G Buschmann  K Bickhardt  H J Reinhard  H J Chevalier  A Pfeiffer 《Berliner und Münchener tier?rztliche Wochenschrift》1970,83(24):477-480

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Hemophilia B (factor IX deficiency) with concomitant factor XII degradation in a male crossbreed cat     

Lutze G  Kutschmann K  Fürst K  Schneppenheim R 《Berliner und Münchener tier?rztliche Wochenschrift》2005,118(5-6):255-260

A male cat suffered from a severe haemorrhagic disorder manifesting as deep, partly infected cutaneous haematomas, enhanced and prolonged bleeding after injuries and subsequent lameness at several occasions. Bleeding resulted in severe anaemia with haematocrit falling to as low as 0.10 L/L. Haemophilia B was diagnosed based on factor IX deficiency with a functional residual activity of 5% and factor IX antigen of 8%, respectively. Additionally, factor XII activity was reduced to 32% of normal. The mutation 31217G==>A in exon 8 of the factor IX gene, predicting the amino acid exchange G366R was identified as the cause of moderate factor IX deficiency. This is the first mutation identified in cats with haemophilia B. Treatment was limited to local therapy and palliation, insufficient to prevent lethal outcome due to severe anaemia.  相似文献   

Surface crystallization in a liquid AuSi alloy     

Shpyrko OG  Streitel R  Balagurusamy VS  Grigoriev AY  Deutsch M  Ocko BM  Meron M  Lin B  Pershan PS 《Science (New York, N.Y.)》2006,313(5783):77-80

X-ray measurements reveal a crystalline monolayer at the surface of the eutectic liquid Au82Si18, at temperatures above the alloy's melting point. Surface-induced atomic layering, the hallmark of liquid metals, is also found below the crystalline monolayer. The layering depth, however, is threefold greater than that of all liquid metals studied to date. The crystallinity of the surface monolayer is notable, considering that AuSi does not form stable bulk crystalline phases at any concentration and temperature and that no crystalline surface phase has been detected thus far in any pure liquid metal or nondilute alloy. These results are discussed in relation to recently suggested models of amorphous alloys.  相似文献   

Platelet-neutrophil aggregate formation in blood samples from dogs with systemic inflammatory disorders     

Dircks BH  Mischke R  Schuberth HJ 《American journal of veterinary research》2012,73(7):939-945

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