Online control of wood peeling process: Acoustical and vibratory measurements of lathe checks frequency     

Louis Étienne Denaud  Laurent Bléron  Alain Ratle  Rémy Marchal 《Annals of Forest Science》2007,64(5):569-575

In the course of most wood machining processes, operators are usually able to detect various problems simply by hearing the sound emitted by the process. This is especially true for wood peeling. Lathe checks formation has been identified as one of the typical situations that an experimented peeler can detect. Poplar and beech veneer samples have been produced on a laboratory microlathe, using working conditions deliberately favourable to checking. Forces, sound, and vibration levels were measured during the tests. The lathe check frequencies have been determined on both sound and vibration signals using a local Root Mean Square (RMS) averaging and a peak detection algorithm. This makes possible the evaluation of lathe checks distribution along the veneer length. The technique was validated by measuring the real veneer profile using a specific apparatus developed by IVALSA-CNR in Trento (Italy).  相似文献   

High resolution protein electrophoresis of 100 paired canine cerebrospinal fluid and serum     

Behr S  Trumel C  Cauzinille L  Palenché F  Braun JP 《Journal of veterinary internal medicine / American College of Veterinary Internal Medicine》2006,20(3):657-662

This study was performed to investigate the diagnostic relevance of cerebrospinal fluid (CSF) high resolution electrophoresis. The laboratory technique was applied to 100 paired samples of canine CSF and serum, with paired samples tested during the same analytical run, as recommended in human medicine. Ninety four of the dogs had a neurological disease and 6 healthy dogs served as a control group. A strong linear correlation between CSF total protein concentration and the albumin quota (AQ) was found in the control group and in the inflammatory (infectious or noninfectious), neoplastic, and miscellaneous groups: AQ = 0.015 CSF total protein--0.102, r = 0.990. This correlation suggests that an increased CSF total protein concentration can be an indicator of blood brain barrier dysfunction. The highest median AQ value was found in the aseptic suppurative meningitis group, but no statistical differences were found between this and the other groups. The AQ, calculated with this technique, did not provide any additional information. Moreover, although unexpected, the electrophoretic profiles were not characteristic of any particular disease. In conclusion, this study did not confirm high resolution electrophoresis of paired CSF and serum samples to be a valuable ancillary diagnostic tool for canine neurological diseases.  相似文献   

Impact of silviculture on dead wood and on the distribution and frequency of tree microhabitats in montane beech-fir forests of the Pyrenees     

Laurent Larrieu  Alain Cabanettes  Antoine Delarue 《European Journal of Forest Research》2012,131(3):773-786

In forest ecosystems, the level of biodiversity is strongly linked to dead wood and tree microhabitats. To evaluate the influence of current forest management on the availability of dead wood and on the abundance and distribution of microhabitats, we studied the volume and diversity of dead wood objects and the distribution and frequency of cavities, dendrothelms, cracks, bark losses and sporophores of saproxylic fungi in montane beech-fir stands. We compared stands unmanaged for 50 or 100 years with continuously managed stands. A total of 1,204 live trees and 460 dead wood objects were observed. Total dead wood volume, snag volume and microhabitat diversity were lower in the managed stands, but the total number of microhabitats per ha was not significantly different between managed and unmanaged stands. Cavities were always the most frequent microhabitat and cracks the least frequent. Dendrothelm and bark loss were favored by management. Beech (Fagus sylvatica) carried many more microhabitats than silver fir (Abies alba), especially cavities, dendrothelms and bark losses. Fir very scarcely formed dendrothelms. Secondary tree species played an important role by providing cracks and bark losses. The proportion of microhabitat-bearing trees increased dramatically above circumference thresholds of 225 cm for beech and 215 cm for fir. Firs with a circumference of less than 135 cm did not carry microhabitats. In order to conserve microhabitat-providing trees and to increase the volume of dead wood in managed stands, we recommend conserving trees that finish their natural cycle over 10–20% of the surface area.  相似文献   

A lineage of myeloid cells independent of Myb and hematopoietic stem cells   总被引：1，自引：0，他引：1  

Schulz C  Gomez Perdiguero E  Chorro L  Szabo-Rogers H  Cagnard N  Kierdorf K  Prinz M  Wu B  Jacobsen SE  Pollard JW  Frampton J  Liu KJ  Geissmann F 《Science (New York, N.Y.)》2012,336(6077):86-90

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A major quantitative trait allele for resistance to the Sugarcane yellow leaf virus (Luteoviridae)     

Laurent Costet  Louis‐Marie Raboin  Magali Payet  Angélique D’Hont  Samuel Nibouche 《Plant Breeding》2012,131(5):637-640

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Architectural and genetic characterization of Hydrangea aspera subsp. aspera Kawakami group, H. aspera subsp. sargentiana and their hybrids     

Laurent Crespel  Philippe Morel  Gilles Galopin 《Euphytica》2012,184(3):289-299

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Neurological lameness in the cat: common causes and clinical approach     

Garosi L 《Journal of Feline Medicine and Surgery》2012,14(1):85-93

PRACTICAL RELEVANCE: Neurological causes of lameness are infrequently seen in cats but they are an important consideration when an obvious orthopaedic cause cannot be identified. Monoparetic cats are also frequently presented for veterinary investigation with the main complaint being lameness. CLINICAL CHALLENGES: Neurological causes of lameness may be difficult to determine without access to advanced imaging modalities, electrodiagnostics or cerebrospinal fluid analysis. AUDIENCE: This review, aimed at all veterinarians who treat cats, sets out to describe the specific approach to cats with lameness that cannot be attributed to an orthopaedic cause. It describes the diagnosis and management of the most common neurological conditions responsible for lameness or monoparesis in cats.  相似文献   

Welcome chinks of light     

L Garosi  A Sparkes 《Journal of Feline Medicine and Surgery》2012,14(9):611

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Anatomic variations of feline internal and external jugular veins     

Specchi S  Olive J  Auriemma E  Blond L 《Veterinary radiology & ultrasound》2012,53(4):367-370

We evaluated 50 feline head and neck computed tomography examinations to determine the prevalence of vascular variation in the internal and external jugular veins. We identified three distinct anatomic conformations of the internal jugular vein. No variation of external jugular vein morphology was detected. Feline patients can have different internal jugular vein morphology that should be recognized for surgical planning.  相似文献   

Ultrasonographic characterization of the feline cardia and pylorus in 34 healthy cats and three abnormal cats     

Couturier L  Rault D  Gatel L  Belli P 《Veterinary radiology & ultrasound》2012,53(3):342-347

A prospective study was performed in 34 fasted healthy cats to describe the normal ultrasonographic anatomy of the cardia and pylorus. Measurements were obtained for the caudal esophageal wall thickness (Ew), cardia wall thickness (Cw), pyloric wall thickness (Pw), thickness of the pyloric muscularis (Mp), length of the thicker part of the proximal duodenal submucosa (Dl). Among the 34 cats, 24 were examined using a linear transducer, and 10 with a microconvex transducer. Ew and Cw could be measured in 70% of the cats when a linear transducer was used, in 100% of the cats when a microconvex probe was used, Pw and Mp could be measured in 100% of the cats whatever probe was used. The submucosa of the most proximal part of the duodenum was thicker in half of the cats in longitudinal section. The muscularis layer of the pylorus was triangular in longitudinal section and thicker than the muscularis of the proximal duodenum. The mean for Ew, Cw, Pw, Mp, and DI was 4.9 mm (SD = 1.1), 5 mm (SD = 0.6), 4.4 mm (SD = 0.6), 2.5 mm (SD = 0.5), and 4.7 mm (SD = 2.38), respectively. Three cats with abnormalities of the cardia and pylorus are also described to illustrate clinical implications.  相似文献