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Cravo Norte, Colombia

Nozue Y.,Sumitomo Chemical | Kawashima Y.,Sumitomo Chemical | Seno S.,Sumitomo Chemical | Nagamatsu T.,Sumitomo Chemical | And 8 more authors.
Macromolecules | Year: 2011

An experiment was conducted to prove evidence for a transient ordered mesophase in the crystallization of PE with short chain branches (SCB) placed at precise intervals along the chain. The branched PE (polyethylene) samples were synthesized by ADMET polymerization technology with either ethyl branches precisely spaced on every 21st carbon (EB21) or with hexyl branches on every 21st carbon (HB21). The DSC thermograms of EB21 and HB21 were obtained after heating to 50°C, cooling to -2050°C at 1050°C/min, and reheating at 1050°C/min, and the thermal profiles show sharp exothermic/endothermic peaks during the cooling/heating segments. Furthermore, polarized optical microscopy (POM) of samples having the same thermal history as those analyzed by DSC showed that a birefringent structure was rapidly formed below the phase transition temperature. In EB21 isothermal crystallization, an interesting nanoscale structural formation was observed in the SAXS profiles. On the other hand, in HB21, the exclusion of the hexyl branch was evidenced. Source


Vargas G.,Colombian Sugarcane Research Center | Lastra L.A.,Colombian Sugarcane Research Center | Solis M.A.,U.S. Department of Agriculture
Florida Entomologist | Year: 2013

Diatraea tabernella is recorded for the first time in the Cauca River Valley of Colombia. Even though there has been no information on the status of D. tabernella in Colombia for almost a century, its recent appearance creates concern about its potential economic importance by virtue of its abundance and distribution in the northern region of the Cauca River Valley. Descriptions of the pupae and the male genitalia of D. saccharalis, D. indigenella, and D. tabernella are given, together with a key to aid in the identification of Diatraea species in the region. Also information and perspectives on biological control of D. tabernella are presented. Source


Mosquera M.E.D.,Colombian Sugarcane Research Center | Gonzalez J.A.C.,Colombian Sugarcane Research Center
2015 Workshop on Engineering Applications - International Congress on Engineering, WEA 2015 | Year: 2015

A soil monitoring network using a wireless communications system was designed and implemented at a sugarcane plantation located in the department of Valle del Cauca, Colombia. This hybrid system, based on the ZigBee standard and mobile communication technologies, combined the most appropriate features to collect and display data recorded by sensors and stored in dataloggers, forming a most versatile network. © 2015 IEEE. Source


Gomez P.A.L.,Colombian Sugarcane Research Center | Cobo B.D.F.,Colombian Sugarcane Research Center | Castro E.P.W.,Colombian Sugarcane Research Center | Isaacs E.C.H.,Colombian Sugarcane Research Center
Zuckerindustrie | Year: 2011

Among the costs of the whole cane sugar and ethanol production system, the activities covered by harvesting (manual and mechanical), road transportation and cane unloading are the most expensive category of operations. A comprehensive study of the cane transport system, which covers topics from system logistics to cane bin design, is being undertaken for the Colombian sugar industry. Models for predicting fuel consumption have been developed and tested using techniques such as GPS (Global Positioning System), pull load and direct fuel flow measurements for the complete operational cycles. Sensitivity trials have also been performed to analyze the influence of bin mass on fuel consumption in the complete cycle and FEA (Finite Element Analysis) modeling has been applied to the design and construction of new equipment. Results show that reductions of 5% of fuel costs are achieved with the 10% structural mass reduction achieved. Source

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