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1
artículo
Publicado 2012
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Scallion (Allium fistulosum) is a highly perishable green vegetable due to its moisture content, its high metabolic rate and their poor conditions of post-harvest during to harvest and transport. The objective of this research was to determine the relationship between visual deterioration´s product and changes generated in the mechanical and acoustic properties of the same. The scallion grown in Aquitania, Boyacá Colombia was stored under different conditions of storing: vacuum packed (10 mbar) and unpacked (HR 68%) and storage temperature 4 ºC and 16 ºC until deterioration by visual appearance. The acoustic mechanical changes in firmness, crispness and fracture for unpacked scallion and stored at 4 °C occurred on day 15 of storage, and visual deterioration on day 13. For the unpacked product and stored at 16 °C, the biggest change was presented at sixth day. The vacuum packed prod...
2
artículo
Publicado 2012
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Scallion (Allium fistulosum) is a highly perishable green vegetable due to its moisture content, its high metabolic rate and their poor conditions of post-harvest during to harvest and transport. The objective of this research was to determine the relationship between visual deterioration´s product and changes generated in the mechanical and acoustic properties of the same. The scallion grown in Aquitania, Boyacá Colombia was stored under different conditions of storing: vacuum packed (10 mbar) and unpacked (HR 68%) and storage temperature 4 ºC and 16 ºC until deterioration by visual appearance. The acoustic mechanical changes in firmness, crispness and fracture for unpacked scallion and stored at 4 °C occurred on day 15 of storage, and visual deterioration on day 13. For the unpacked product and stored at 16 °C, the biggest change was presented at sixth day. The vacuum packed prod...
3
tesis de grado
Publicado 2025
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El objetivo de este manuscrito fue evaluar el efecto del aceite esencial de muña (Minthostachys mollis) en el recubrimiento a base de harina de maca negra (Lepidium meyenii Walp.) y montmorillonita para prolongar la vida útil del melón (Cucumis melo L.) mínimamente procesado. Los cubos de melón se dividieron en cuatro tratamientos: T1 control (sin recubrimiento), T2, T3 y T4 con 0,1 % v/v, 0,2 % v/v y 0,3 % v/v de aceite esencial de muña respectivamente, además se les adicionó harina de maca (2,5 %) y montmorillonita (0,3 %), posteriormente todos los tratamientos se almacenaron durante 12 días a 5±1 °C. Se analizaron la pérdida de peso, acidez titulable, pH, sólidos solubles totales, color, firmeza, actividad de agua, evaluaciones microbiológicas de mohos y levaduras, Salmonella spp. y Escherichia coli. El T2 mostró menor pérdida de peso (8,7 %) y firmeza (22,3 %), ademá...
4
artículo
Publicado 2012
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Presently work is given to know the importance of the previous characterization of the diverse types of minerals of Fe. The importance of the metallurgical properties and its respective mineralogy characterization are important for the development of respective metallurgical processes appropriate. In this work, it is given to know mineralogy characterizations of diverse Minerals of Fe. These results can be useful, for example in the development of processes of direct reduction with Gas.
5
artículo
Publicado 2012
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Presently work is given to know the importance of the previous characterization of the diverse types of minerals of Fe. The importance of the metallurgical properties and its respective mineralogy characterization are important for the development of respective metallurgical processes appropriate. In this work, it is given to know mineralogy characterizations of diverse Minerals of Fe. These results can be useful, for example in the development of processes of direct reduction with Gas.
6
artículo
Publicado 2015
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The application of edible coatings obtainable from alternative biodegradable materials has gained attention as a promising treatment to prolong the shelf-life of fresh-cut vegetables. Thus, this work aimed to develop a biodegradable coating based on fruit and vegetable residues flour. Immersion coating strategy was studied on the quality of minimally fresh-cut carrots during refrigeration storage by means of weight loss, color variation, pH, titratable acidity and soluble solids content. Better performance was obtained for coated carrots, which exhibited a tendency to have lower whiteness index than uncoated counterparts and enhanced overall quality. Despite a drop in color saturation expressed by chroma values (varying from 59 to 46) was observed, color index presented a positive value for all samples (varying from 13 to 15) indicating orange color preservation throughout storage. Altho...
7
artículo
Publicado 2015
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The application of edible coatings obtainable from alternative biodegradable materials has gained attention as a promising treatment to prolong the shelf-life of fresh-cut vegetables. Thus, this work aimed to develop a biodegradable coating based on fruit and vegetable residues flour. Immersion coating strategy was studied on the quality of minimally fresh-cut carrots during refrigeration storage by means of weight loss, color variation, pH, titratable acidity and soluble solids content. Better performance was obtained for coated carrots, which exhibited a tendency to have lower whiteness index than uncoated counterparts and enhanced overall quality. Despite a drop in color saturation expressed by chroma values (varying from 59 to 46) was observed, color index presented a positive value for all samples (varying from 13 to 15) indicating orange color preservation throughout storage. Altho...
8
artículo
The need to develop and know methods for metallurgical treatment to process gold-bearing refractory minerals or hard to treat be- cause of carbon contents, tellurium, antimony, arsenic, carbonates and gold in solution solid sulfides, forces us to study the different methods of specific oxidation that should be applied in each mineral before to leach ore to reach high recoveries into precious metals Through Gravimetrically followed by cyanidation is obtained 94.74% of gold extract in the studied mineral.
9
artículo
The need to develop and know methods for metallurgical treatment to process gold-bearing refractory minerals or hard to treat be- cause of carbon contents, tellurium, antimony, arsenic, carbonates and gold in solution solid sulfides, forces us to study the different methods of specific oxidation that should be applied in each mineral before to leach ore to reach high recoveries into precious metals Through Gravimetrically followed by cyanidation is obtained 94.74% of gold extract in the studied mineral.
10
artículo
This research aims to explore possible solutions to the problems presented in auriferous sulfide minerals , which have cianicidas by metals ( Gold companions ) can not be cyanide by high reagent consumption , which makes the process uneconomical . Also be a problem hitting the small domestic mining sites that have these features that can not be traded concentrates by high penalties imposed on them , then creating a social problem that should be taken into account. At the experimental level by testing and subsequent acid leach cyanidation seek to find a process that allows for adequate separation of gold copper and other species also have high technical and economic efficiency. Exploratory tests shown indicate the feasibility of finding the right process for the investigated mineral content has Gold , chalcopyrite , malachite , magnetite , hematite , goethite , covellite , chalcocite , an...
11
artículo
This research aims to explore possible solutions to the problems presented in auriferous sulfide minerals , which have cianicidas by metals ( Gold companions ) can not be cyanide by high reagent consumption , which makes the process uneconomical . Also be a problem hitting the small domestic mining sites that have these features that can not be traded concentrates by high penalties imposed on them , then creating a social problem that should be taken into account. At the experimental level by testing and subsequent acid leach cyanidation seek to find a process that allows for adequate separation of gold copper and other species also have high technical and economic efficiency. Exploratory tests shown indicate the feasibility of finding the right process for the investigated mineral content has Gold , chalcopyrite , malachite , magnetite , hematite , goethite , covellite , chalcocite , an...
12
artículo
Publicado 2001
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The present work deals with the proposed treatment scheme for the recovery of PVC and PET using mineral processing operations such as: size reduction. Separation by dense means, alkaline treatment and flotation. The results achieved at the laboratory level indicate that 95% of PVC and 97% of PET can be recovered from the selected sample of plastic containers collected in a residual sector of the city of Bucaramanga, Colombia.
13
artículo
Publicado 2001
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The present work deals with the proposed treatment scheme for the recovery of PVC and PET using mineral processing operations such as: size reduction. Separation by dense means, alkaline treatment and flotation. The results achieved at the laboratory level indicate that 95% of PVC and 97% of PET can be recovered from the selected sample of plastic containers collected in a residual sector of the city of Bucaramanga, Colombia.
14
artículo
Publicado 2003
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In the present work the revision, deduction and application of mathematical models in the quantification of the reaction kinetics of leaching processes of national sulphided minerals in chemical systems is made. The interaction between the mineral particles and the leaching solution is controlled by three possible mechanisms: by chemical reaction, by diffusion through the porous bed and by mass transfer; Each mechanism has its own mathematical modeling and parametric conditions. Experimental runs of leaching of gold and copper minerals are presented, in which their kinetic control equations of the most relevant variables are shown. Other empirical models are also shown that are used to elucidate the phenomenology of the leaching of mineral species, call chalcopyrite, sphalerite and galena.
15
artículo
Publicado 2003
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In the present work the revision, deduction and application of mathematical models in the quantification of the reaction kinetics of leaching processes of national sulphided minerals in chemical systems is made. The interaction between the mineral particles and the leaching solution is controlled by three possible mechanisms: by chemical reaction, by diffusion through the porous bed and by mass transfer; Each mechanism has its own mathematical modeling and parametric conditions. Experimental runs of leaching of gold and copper minerals are presented, in which their kinetic control equations of the most relevant variables are shown. Other empirical models are also shown that are used to elucidate the phenomenology of the leaching of mineral species, call chalcopyrite, sphalerite and galena.
16
artículo
Publicado 1998
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Thermodynamic simulation models have been developed to observe the behavior of the minor elements Zn, Pb, As, Sb and Bi; as well as the major elements Cu, Fe, Si, 0 and S in the conversion and fusion processes: NORANDA and ISASMELT for the production of copper-rich mattes. The Noranda process shows a steady state model for obtaining a high-grade matte in metallic copper. The lsasmelt process is based on the concept of the two independent reaction sites in the bath (slag-killing interface): rapid oxidation and slow reduction. The heat balance of the process and the distribution thermodynamics of the minor elements are united and expressed in terms of the process variables such as temperature, enriched 02, composition of the charge, degree of matte and content of the magnetite in the Slag and other variables are incorporated into the modeling, which can predict the operating effects of che...
17
artículo
Publicado 1998
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Thermodynamic simulation models have been developed to observe the behavior of the minor elements Zn, Pb, As, Sb and Bi; as well as the major elements Cu, Fe, Si, 0 and S in the conversion and fusion processes: NORANDA and ISASMELT for the production of copper-rich mattes. The Noranda process shows a steady state model for obtaining a high-grade matte in metallic copper. The lsasmelt process is based on the concept of the two independent reaction sites in the bath (slag-killing interface): rapid oxidation and slow reduction. The heat balance of the process and the distribution thermodynamics of the minor elements are united and expressed in terms of the process variables such as temperature, enriched 02, composition of the charge, degree of matte and content of the magnetite in the Slag and other variables are incorporated into the modeling, which can predict the operating effects of che...
18
artículo
Publicado 2007
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The sample that is the object of this research work is a kind of bituminous coal, from the Mount Huáscar, province of Oyón, department of Lima. Provided by the Coal Mine Company. The mineralogical characterization of the sample coal, to show the presence of the following minerals: Graphite (grf) and Pyrite (py). The percentage distribution indicates graphite and 96,91% 3,09% pyrite, the particles are mostly free, accordingly modal analysis indicates that the degree of liberation of graphite and pyrite is 100%, that is counted all particles are free, as can be seen in the photos N.º 1, 2 ,3 and 4. Based on the characterization done it can be concluded that sulfur is in the pyrite, which is the polluter coal. Metallurgical tests were conducted preliminary gravity and flotation; being the outcome of the gravity is not satisfactory. The three tests metallurgical more representative of flo...
19
artículo
Publicado 2007
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The sample that is the object of this research work is a kind of bituminous coal, from the Mount Huáscar, province of Oyón, department of Lima. Provided by the Coal Mine Company. The mineralogical characterization of the sample coal, to show the presence of the following minerals: Graphite (grf) and Pyrite (py). The percentage distribution indicates graphite and 96,91% 3,09% pyrite, the particles are mostly free, accordingly modal analysis indicates that the degree of liberation of graphite and pyrite is 100%, that is counted all particles are free, as can be seen in the photos N.º 1, 2 ,3 and 4. Based on the characterization done it can be concluded that sulfur is in the pyrite, which is the polluter coal. Metallurgical tests were conducted preliminary gravity and flotation; being the outcome of the gravity is not satisfactory. The three tests metallurgical more representative of flo...
20
artículo
Mathematical modelling applied to batch milling (at experimental level), is a very important tool to simulate and predict the granulometric yield of a given treated ore; this means, for a given duration of milling operation, to obtain an estimate of the corresponding granulometric analysis, which can then be tested with real data later on, to verify the estimates. The model involves the selection and fracture functions depending on each mesh size in the ore distribution. This will allow the prediction of effective and reliable results, saving costs and more importantly, time, without the need to perform the milling process for each prediction of batch milling.
