Visual analysis for drum sequence transcription

A system is presented for analysing drum performance video sequences. A novel ellipse detection algorithm is introduced that automatically locates drum tops. This algorithm fits ellipses to edge clusters, and ranks them according to various fitness criteria. A background/foreground segmentation method is then used to extract the silhouette of the drummer and drum sticks. Coupled with a motion intensity feature, this allows for the detection of ‘hits’ in each of the extracted regions. In order to obtain a transcription of the performance, each of these regions is automatically labeled with the corresponding instrument class. A partial audio transcription and color cues are used to measure the compatibility between a region and its label, the Kuhn-Munkres algorithm is then employed to find the optimal labeling. Experimental results demonstrate the ability of visual analysis to enhance the performance of an audio drum transcription system

Exploring wear at the nanoscale with circular mode atomic force microscopy

The development of atomic force microscopy (AFM) has allowed wear mechanisms to be investigated at the nanometer scale by means of a single asperity contact generated by an AFM tip and an interacting surface. However, the low wear rate at the nanoscale and the thermal drift require fastidious quantitative measurements of the wear volume for determining wear laws. In this paper, we describe a new, effective, experimental methodology based on circular mode AFM, which generates high frequency, circular displacements of the contact. Under such conditions, the wear rate is significant and the drift of the piezoelectric actuator is limited. As a result, well-defined wear tracks are generated and an accurate computation of the wear volume is possible. Finally, we describe the advantages of this method and we report a relevant application example addressing a Cu/Al2O3 nanocomposite material used in industrial applications

Electron Transfer Catalysis of The Hydrogenolysis of Acyl Dicarbonyl Cyclopentadienyliron Complexes by Tributyltin Hydride

The conversion of acyl dicarbonyl cyclopentadienyliron compounds Cp(CO)2Fe(COR) into aldehydes is not straightforward. It is shown here, mainly from electrochemical results, that the hydrogenolysis of the metal acyl bond can be efficiently achieved by trialkytin hydrides under very mild conditions, according to a chain reaction process initiated by an electron transfer to the acyl complex. The expected aldehyde is formed together with the heterobinuclear iron-tin complex

Electron Transfer Catalysis of The Hydrogenolysis of Acyl Dicarbonyl Cyclopentadienyliron Complexes by Tributyltin Hydride

The conversion of acyl dicarbonyl cyclopentadienyliron compounds Cp(CO)2Fe(COR) into aldehydes is not straightforward. It is shown here, mainly from electrochemical results, that the hydrogenolysis of the metal acyl bond can be efficiently achieved by trialkytin hydrides under very mild conditions, according to a chain reaction process initiated by an electron transfer to the acyl complex. The expected aldehyde is formed together with the heterobinuclear iron-tin complex

Effects of Dietary Palm Oil on the Whole-Body Mineral Composition of African Catfish, Heterobranchus longifilis (Teleostei, Clariidae)

A 50-day feeding trial was carried out to determine the effect of the graded incorporation of crude palm oil on the whole-body mineral composition of African catfish juveniles Heterobranchus longifilis. Six diets were formulated to contain from 3–21% crude palm oil (CPO). Whole-body macromineral composition represented by calcium (Ca), potassium (K), sodium (Na), phosphorus (P) and magnesium (Mg) showed significant variations (p < 0.05) with the different dietary palm oil levels. The same trend was observed in whole-body micromineral composition in iron (Fe), zinc (Zn), manganese (Mn) and copper (Cu). Regardless of the micromineral, the increase in the body was related with increasing dietary palm oil levels between 3 and 9%. In summary, the results of this study suggest that an incorporation of palm oil into the fish diet modifies the mineral body composition without major effects on health and nutritional quality of fish

Caractérisation de la pêche aux crevettes d’eau douce Atya scabra (Leach, 1815) (Decapoda: Atyidae) dans la rivière Bia, Côte d’Ivoire

La crevette Atya scabra (Leach, 1815) est traditionnellement capturée dans la Rivière Bia à Biaka et Aboisso. Dans ces localités, la pêche est dominée par les Ivoiriens (94%) représentés par les Agni contre 6% pour les non nationaux. A Aboisso, en plus des Agni (52%), nous avons eu des Tchui (4%), des Ashanti (4%), des Mossi (4%), des Dida (4%), des Lobi (5%), des Bété (4%), des Malinké (13%), des Sénoufo (5%) et des Baoulé (5%). Quant à Biaka, des Agni (92%), des Baoulé (4%) et des Wobé (4%) ont été enregistrés. Outre des pêcheurs professionnels, environ 75% des acteurs exercent une activité secondaire aussi bien à Aboisso qu’à Biaka. Chez les Ivoiriens exerçant cette activité, tous les âges sont présents. En revanche, les acteurs non nationaux sont âgés de moins de 30 ans. La plupart des ivoiriens acteurs du secteur ont été instruits (94%) contre 6% d’illettrés. Au niveau des non nationaux, seulement 33% des pêcheurs ont reçu une instruction primaire. Les prises saisonnières de crevettes sont significativement élevées dans la localité de Biaka par rapport à celle d’Aboisso (P &lt; 0,05). L’effort de pêche élevé dans les deux localités constitue une entrave pour une gestion durable du stock.© 2016 International Formulae Group. All rights reservedMots clés: Crevettes, Atya scabra, acteurs de pêche, rivière Bia, Côte d’IvoireEnglish Title: Characterization of freshwater shrimp Atya scabra (Leach, 1815) (Decapoda: Atyidae) fishing in the Bia river, Côte d’IvoireEnglish AbstractFreshwater shrimp Atya scabra (Leach 1815) is traditionally captured in Bia’s river in Biaka and Aboisso. In this localities, fishing is dominated by Ivory Coast’s people (94%) represented by Agni people against 6% of foreigners. In Aboisso, in addition to the Agni people (52%), we have had 4% of Thui people, Ashanti (4%), Mossi (4%), Dida (4%), Lobi (5%), Bété (4%), Malinké (13%), Senoufo (5%) and Baoulé people (5%). As for Biaka, Agni (92%), Baoulé (4%) and Wobé (4%) were registered for that activity. A part from the professional fishermen, nearly 75% of them do some secondary activities as well in Aboisso as Biaka. All Ivory-coast people pursuing this activity are all from different type of ages, although all foreigners are less  than 30 years old. The majority of the Ivory-Coast people who are doing this activity are educated as 94% against 6% who are not. Regarding the foreigners, only 33% of the fishermen received primary education. Seasonal catches of shrimp are significantly higher in Biaka region than Aboisso (P &lt; 0.05). The high-fishing effort in these two localities is an obstacle for the long-lasting stock management.© 2016 International Formulae Group. All rights reservedKeywords: Freshwater shrimp, Atya Scabra, actors in fishing, Bia river, Ivory-coas