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Effect of Switching on Metal-Organic Interface Adhesion Relevant to Organic Electronic Devices

Advances in Materials Physics and Chemistry 2013年第7期3卷 299-306页

作者： Babaniyi babatope Akogwu Onobu Olusegun O. Adewoye Winston O. Soboyejo Department of Mechanical and Aerospace Engineering Princeton University Princeton USA Department of Mechanical and Aerospace Engineering Princeton University Princeton USA 3Materials Science and Engineering Department African University of Science and Technology Abuja Nigeria Materials Science and Engineering Department African University of Science and Technology Abuja Nigeria Department of Physics Obafemi Awolowo University Ile-Ife Nigeria Materials Science and Engineering Department African University of Science and Technology Abuja Nigeria

Considerable efforts are currently being devoted to investigation of metal-organic, organic-organic and organic-inorganic interfaces relevant to organic electronic devices such as organic light emitting diode (OLEDs), organic photovoltaic solar cells, organic field effect transistors (OFETs), organic spintronic devices and organic-based Write Once Read Many times (WORM) memory devices on both rigid and flexible substrates in laboratories around the world. The multilayer structure of these devices makes interfaces between dissimilar materials in contact and plays a prominent role in charge transport and injection efficiency which inevitably affect device performance. This paper presents results of an initial study on how switching between voltage thresholds and chemical surface treatment affects adhesion properties of a metal-organic (Au-PEDOT:PSS) contact interface in a WORM device. Contact and Tapping-mode Atomic Force Microscopy (AFM) gave surface topography, phase imaging and interface adhesion properties in addition to SEM/EDX imaging which showed that surface treatment, switching and surface roughness all appeared to be key factors in increasing interface adhesion with implications for increased device performance.

关键词： AFM Interface Adhesion Force Organic Electronics Voltage Switching Organic Memory Devices Surface Treatment

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Minimax Multivariate Control Chart Using a Polynomial Function

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Applied Mathematics 2011年第12期2卷 1539-1545页

作者： Johnson Ademola Adewara Kayode Samuel Adekeye Osebekwin Ebenezer Asiribo Samuel babatope Adejuyigbe 不详

Minimax control chart uses the joint probability distribution of the maximum and minimum standardized sample means to obtain the control limits for monitoring purpose. However, the derivation of the joint probability distribution needed to obtain the minimax control limits is complex. In this paper the multivariate normal distribution is integrated numerically using Simpson’s one third rule to obtain a non-linear polynomial (NLP) function. This NLP function is then substituted and solved numerically using Newton Raphson method to obtain the control limits for the minimax control chart. The approach helps to overcome the problem of obtaining the joint probability distribution needed for estimating the control limits of both the maximum and the minimum statistic for monitoring multivariate process.

关键词： Minimax Non-Linear Polynomial Process Maximum and Minimum

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Performance Evaluation of Dry Season Okra under Sawdust and Trash Mulch Cover Treatments in Southwestern Nigeria

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Open Journal of Soil Science 2013年第8期3卷 337-341页

作者： Oladipo Isaac Olaposi Adewumi Johnson Kayode Dairo Olawale Usman Adejuyigbe Samuel babatope Ajayi Ebenezer Ayodele Department of Agricultural Engineering Federal University of Agriculture Abeokuta Nigeria Department of Agricultural Engineering Federal University of Technology Akure Nigeria Department of Mechanical Engineering Federal University of Agriculture Abeokuta Nigeria The Federal Polytechnic Department of Agricultural and Bioenvironmental Engineering PMB Ado Ekiti Nigeria

This paper reports the experimental investigation of the agronomic performance of okra under various quantities of both sawdust and trash mulches. The location of the field was the research farmland of the Federal Polytechnic Ado Ekiti Nigeria;Lat 6?N and Long 16?E. The experimental design used was complete randomized design with 6 treatments on both specimens. The experiments were repeated the following year on the same plot but with transposed plot allocation. Soil moisture loss from uncovered plot was with the highest value dropping to less than 2 per cent. It was followed by that of trash plot and the lowest loss was on sawdust mulched plot. The number of leave formed by okra on sawdust, trash and no mulch plots was 43, 36 and 27 respectively while maximum girth diameter was 37 mm in both trash and sawdust covered plots but okra plant on control plot attained only 26 mm diameter. Fruit yield were almost similar to trash and sawdust mulched okra having 7.5 and 7.6 Tonnes/Ha respectively while control plot recorded 5.2 Tonnes/Ha. The ash content of dry matter of sawdust, trash and no mulched plants was 0.25, 0.20 and 0.17 kg respectively. It was concluded that sawdust could perform as much as the traditional trash materials commonly used in Southwestern Nigeria. Also, sawdust was a good material for conserving soil moisture.

关键词： Evapotranspiration Carbon Capture Agronomic Development Soil Moisture Climate Change

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