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Methodology for Precious Metal Recovery in Computer Printed Circuit

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Journal of Chemistry and Chemical Engineering 2013年第8期7卷 759-766页

作者： Miguel Aguilar Cortest martha lilia dominguez patifio Antonio Rodriguez Martinez Rene Guardian Tapia[ Rosa Maria Melgoza Aleman Engineering and Applied Science Postgraduate School University of A utonomous Morelos State Morelos 62209 Mexico Faculty of Chemical Sciences and Engineering University of 4utonomous Morelos State Morelos 62209 Mexico Engineering and Applied Sciences Research Centre University of A utonomous Morelos State Morelos 62209 Mexico

The life of electronic equipment is becoming increasingly shorter and its replacement always generates a quantity of waste increase, giving rise to a problem of environmental character and still needed new options of solid waste management that will contribute to global sustainable development. Parts of these waste are TCI （the card＇s printed circuit） which containing dangerous elements and turns them into a polluting material from the soil, water and air, being harmful to human health if there is to proper and responsible way, so the recycling of TCI to obtain precious metals is an example of industrial materials that can be recycled. Despite this, large quantities of these are not recycled and some others are not considered. The objective of this work is to present a systematic and ecological methodology for the recovery of valuable materials contained in parts of used in computers, circuit boards using a leaching process. The method determines a set of variables to evaluate the kinetics of the reaction and the leaching of metals that form the substrate of metal and to establish the parameters that affect the rate of leaching of metals through a sensitivity analysis, to identify design alternatives. It determines the quantity and percentages that constitutes the motherboard, processor, video cards, accelerator graphics, network and memory cards RAM, among others and its content of metals such as Cu, Fe, Ag, Au and Pt.

关键词： Precious metals leaching waste electrical and electronic equipment printed circuit board.

Role of Nitrogen and Nutrients in Crop Nutrition

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Journal of Agricultural Science and Technology(B) 2014年第1期4卷 29-37页

作者： Vicente Torres-Olivar Oscar Gabriel Villegas-Torres martha lilia dominguez-patifio Hoctor Sotelo-Nava Antonio Rodrlguez-Martme Rosa Maria Melgoza-Aleman Luis Alonso Valdez-Aguilar Irfin Alia-Tejacal Faculty of Agricultural Sciences Universidad Aut6noma del Estado de Morelos Col. Chamilpa 62209 Cuernavaca MorelosM~xico Faculty of Chemical Sciences and Engineering Universidad Aut6noma del Estado de Morelos Col. Chamilpa 62209 CuernavacaMorelos Mdxico Engineering and Applied Science Research Center Universidad Autdnoma del Estado de Morelos Col. Chamilpa 62209Cuernavaca Morelos M6xieo Department of Horticulture University Autonomous Agraria Antonio Narro Saltillo Coahuila 25315 M~xico

Nutrition is an important factor for the growth and development of plants. Among the main nutritional elements, there are nitrogen （N） and calcium （Ca）. The N comes from two forms of inorganic ions, ammonium （NH4＋） and nitrate （NO3） whose functions in the plant are the increase in leaf area and improving the succulence of many crops, among other essential physiological processes. Both the deficit and excess NO3- have a negative impact on plants increasing susceptibility to insect pests and pathogens, while Ca as divalent ion absorbed Ca2＋ plays an important role in control of physiological disorders and the resistance of plants to diseases to increase the mechanical strength. The N and Ca have a close relationship in the nutritional role of the plant, because the Ca absorption acting nitrates, so that a proper balance affects plants better growth and higher strength.

关键词： Ions absorption nitrate ammonium concentration.

Scientific Software Installation Testing Using a Plan-Do-Check-Act Methodology： A Case Study

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Journal of Chemistry and Chemical Engineering 2015年第3期9卷 227-232页

作者： Jorge dominguez-patifio Antonio Rodriguez Martinez Rosenberg Javier Romero Marco Cruz Chavez martha lilia dominguez Patino Rosa Maria Melgoza Aleman Posgraduate School in Engineering and Applied Science Autonomous University of Morelos State Cuernavaca 62209 Mexico Research Centre of Engineering and Applied Science Autonomous University of Morelos State Cuernavaca 62209 Mexico FCQeI (Faculty of Chemical Sciences and Engineering) Autonomous University of Morelos State Cuernavaca 62209 Mexico

The scientific software installation testing has a main goal： Evaluate if the software meets its requirements and specifications. In this paper, the scientific software installation in six machines is evaluated. The software installation was tested using a PDCA （Plan-Do-Check-Act） approach in 3 machines and were compared with other 3 machines which were installed exclusively based in the installer experience. The software installed on the machines using a PDCA approach for testing, lead to the expected results. Scientific software installation should be tested during the installation and not as a final test. A methodology based on PDCA is recommended for testing scientific software.

关键词： Testing PDCA scientific software.

Characterization by Thermogravimetric Analysis of Polymeric Concrete with High Density Polyethylene Mechanically Recycled

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Journal of Minerals and Materials Characterization and Engineering 2014年第4期2卷 259-263页

作者： Alma Delia Rodriguez Martinez martha lilia dominguez Patino Rosa Maria Melgoza Aleman Gerardo Antonio Rosas Trejo Graduate Engineering and Applied Science Autonomus University of the State of MorelosChamilpaMorelosMexico Faculty of Chemical Sciences and Engineering Autonomus University of the State of MorelosChamilpaMorelosMexico Metallurgical Research Institute University Michoacana de San Nicolas de HidalgoMoreliaMichoacanMexico

This paper presents the results of the characterization by thermogravimetric analysis of a new composite material called polymeric concrete. The polymeric concrete contains micro-particles obtained from High Density Poly-Ethylene (HDPE) mechanically recycled (post-consumer bottles);the official Mexican standard NMX-E-232-SCFI-1999 considers the HDPE as the recyclable plastic material. Thermo-grams based on weight lost were obtained from the raw material (HDPE) and the polymer concrete in order to obtain the glass transition temperature (Tg) and melting temperature (Tf). The analysis conditions were defined from 20°C to 180°C and the heat rate of 1°C/minute. The results show that the glass transition temperature of polymeric concrete is 46°C and the HDPE is 38°C. These results mean that the polymeric concrete is more resistant to decomposition. With respect to the melting temperature, the results show that the 2°C difference between polymeric concrete and HDPE is not significant. The polymeric concrete with HDPE recycled can be considered as composite material thermoplastic. The new material melts when it is heated to 146°C and has the ability to be softened, processed and reprocessed with temperature and pressure changes, which make it possible to obtain molded pieces in the desired shape.

关键词： Polymer Concrete High Density Poly-Ethylene Thermogravimetric Analysis

Evaluation of Methodology for Life Cycle Assessment Applied to Hydroponic Tomato Processes from a System Approach

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Journal of Agricultural Science and Technology(B) 2014年第10期4卷 811-815页

作者： Nadia Lara Ruiz martha lilia dominguez Patino Oscar Gabriel Villegas Torres Luz Elva Marin Vaca Miguel Aguilar Cortes Center of Engineering and Applied Science Autonomus University of Morelos State Chamilpa 62209 Morelos Mexieo Faculty of Chemical Sciences and Engineering Autonomus University of Morelos State Chamilpa 62209 Morelos Mexico Faculty of Agricultural Sciences Autonomus University of Morelos State Chamilpa 62209 Morelos Mexico

Analysis of agricultural production systems of hydroponic tomato in Morelos state of Mexico, through a systematic approach, called systems development of life cycle （SDLC） was performed by comparing this with the methodology known as life cycle assessment （LCA）. This permits to analyze the differences in approaches of all these methodologies to propose improvements in the current system, which can allow an improved assessment of the environmental quality of agricultural products, which often is subject to confusion. That due to measurement parameters are not generally accepted by society, producers and consumers, may ensure that the process is fully sustainable and is considered quite as a green technology processes towards an ecological benefit and therefore for the humanity.

关键词： Analysis hydroponic LCA SDLC.

Continuous Distillation of Non-ideal Mixtures Through Graphical Methods

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Journal of Chemistry and Chemical Engineering 2012年第7期6卷 619-624页

作者： Guillermo Flores-Sanchez Jonathan Ibarra-Bahena Antonio Rodriguez-Martinez R.J. Romero marthalilia dominguez-patifio Engineering and Applied Science Postgraduate School Autonomous University Morelos State Morelos 62209 Mexico Engineering and Applied Sciences Research Centre Autonomous University Morelos State Morelos 62209 M~xico

The current paper deals with the way in which the liquid-vapor equilibrium can be predicted, using the program Microsoft-Excel to obtain the bubble temperatures of twenty different non-ideal mixtures, the location of the azeotrope and the relation of the minimal reflux. The Wilson model was used for the activity coefficient and the cubic equation of state was used for the fugacity coefficient, utilizing the Pitzer correlation for the second virial coefficient.

关键词： Liquid-vapor equilibrium fugacity coefficient activity coefficient azeotrope distillation.

Formation of the Hole Centers in Zinc-Oxide Nanoparticles During Mechanical Processing of ZnO ＋ xMnO2

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材料科学与工程（中英文版） 2010年第1期4卷 11-15页

作者： Mykola Kakazey Marina Vlasova martha dominguez-patifio CIICAp Universidad Autonoma del Estado de Morelos Cuernavaca 62209 Morelos Mexico FCQI Universidad Autonoma del Estado de Morelos Cuernavaca 62209 Morelos Mexico

Avocado Nutritional Diagnosis （Persea americana Mill.）＂Hass＂, Soil Fertility and Water Quality in Ocuituco, Morelos

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Journal of Chemistry and Chemical Engineering 2013年第11期7卷 1068-1073页

作者： Hector Sotelo-Nava Oscar Gabriel Villegas-Torres martha lilia dominguez-Patint Elias Hernfindez Castro Agustin Damian Nava Antonio Rodrlguez-Martmez Carlos Manuel Acosta-Duran Maria Andrade-Rodriguez Iran Alia-Tej acal Faculty of Agricultural Sciences Universidad Aut6noma del Estado de Morelos Cuernavaca 62209 Mexico Faculty of Chemical Sciences and Engineering Universidad Aut6noma del Estado de Morelos Cuernavaca 62209 Mexico Unit of Agricultural and Environmental Sciences Universidad Autonoma de Guerrero Guerrero 39196 Mexico Engineering and Applied Science Research Center Universidad Autonoma del Estado de Morelos Cuernavaca 62209 Mexico

Morelos is the fourth in area cultivated and production volume of avocado. Of the 13 municipalities where it is farmed, Ocuituco represents 43.51% and Tetela del Volain 27.53%. Despite being one of the main fruit species in Morelos, no information related to the fertility of the soil where it is grown, the quality of water available for irrigation and nutritional status of this important fruit for the state. The study was conducted in the municipality of Ocuituco which identified three agro-habitats taking into account climate, landform, soil type and altitude. In each agro-habitat were carried out soil sampling to determine the physical and chemical characteristics based on the Mexican Official Standard NOM-021-SEMARNAT-2000, the chemical quality of water for irrigation as described by Richards （1954） and crop nutrient status of avocado ＂Hass＂ according to the methodology described by Maldonado （2002）. The soils had different physical and chemical characteristics, as well as the nutritional status of avocado trees in the three agro-habitats. The trees had excessive concentration of CI, Cu and Zn. Indices of optimal percentage deviation expressed different nutritional requirements. The water used for irrigation was of low salinity and sodium content, so it can be used without restrictions.

关键词： Soil fertility water quality nutrients Hass.