Multi Mixture Research Articles

Exergy analysis of a multi mixture working fluid absorption refrigeration cycle

This research paper analyzes the exergy of an absorption refrigeration cycle with a multi mixture working fluid selected as water and lithium-bromide. It relies on the fundamental thermodynamic principles, being chiefly the first and second laws. The exergy destructions have been obtained from different parts of the cycle; after which several components are analyzed in terms of their thermodynamics efficiency. Additionally, exergy efficiency and coefficients of performance (COP) are thoroughly investigated. It can be observed from the results of the simulations; the greatest rate of the destruction of exergy exists in the absorber and is 35.87% of the destruction. Such irreversibility is primarily caused by the heat transfer of high-temperature variation. Future improvements may include increasing the rate of heat exchange, which thereby reduces the temperature variation.

A novel method to identify emerging technologies using a semi-supervised topic clustering model: a case of 3D printing industry

There have been recent attempts to identify emerging technologies by using topic-based analysis, but many of them have methodological deficiencies. First, analyses are unsupervised, and unsupervised methods cannot incorporate supervised knowledge that is needed to better identify technological domains. Second, those methods lack semantic interpretation, as many of them still remain at word-level analyses, we developed a novel technology-identification method that uses a semi-supervised topic clustering model (Labeled Dirichlet Multi Mixture model) to integrate technological domain knowledge. The model also generates a sentence-level semantic technological topic description through the topic description method (Various-aspects Sentence-level Description) on information extraction. We used this novel method to analyze the technology of the 3D printing industry, and successfully identified emerging technologies by differentiating new topics from the traditional topics, the results effectively demonstrated the semantic technological topic description by showing sentences. This method could be of great interest to technology forecasters and relevant policy-makers.

Image Dehazing Algorithm Based on Multi Mixed Prior Theory

In order to eliminate the prior blind area and improve the clarity of the fogging image, an image dehazing algorithm based on the multi mixed prior theory is proposed. First, the pixel area of the image is partitioned by dual constraints. Then the atmospheric transmittance of the dual constrained region is obtained by using the multi mixture priori theory. Finally, the guided filter algorithm is used to optimize the transmittance map. The experimental results show that compared with the traditional algorithm, the algorithm has a better visual effect and higher evaluation indexes. The algorithm proposed in this paper has a good restoration effect for fog image restoration.

New Method for Viscosity Estimation of Waxy Lube Oil/MEK-Toluene Solvent Composition

This paper presents a newly developed method to estimate the dynamic viscosity of lubricating oil feedstock/solvent composition in solvent dewaxing process, where the high normal paraffin components are to be extracted from the mixture. A reliable technique to determine the flow properties in the complex multi-components mixture depends on selecting high carbon number, from the C20 to C40 chain, as a solute and light one, bellow C20, as a liquid that matches the wax mass fraction in the light portion of the oil. The study focuses on the viscosity in the dissolution region (liquid phase) to characterize the feedstock/solvent composition behavior. The tested feedstock is ASE30 and the solvent is MEK-Toluene. The selected high carbon numbers are C33, C34, and C45, while the light one is C10. The obtained viscosity results by the proposed method were found to be in good agreement with the predicted viscosities of multi mixture components using the available mixed rules procedure reported in the literature. It can be concluded that the linkage between the solubility model and the carbon number selection could govern the characteristics of the waxy lube oil/MEK-Toluene solution.

Rapid sensing and recovery of palladium(II) using N,N-bis(salicylidene)1,2-bis(2-aminophenylthio)ethane modified sensor ensemble adsorbent

This study aims to develop a novel sensor ensemble adsorbent for rapid sensing and recovery of Pd(II) from water. A highly selective and efficient adsorbent was prepared by immobilization of the synthesized N,N-bis(salicylidene)1,2-bis(2-aminophenylthio)ethane ligand onto mesoporous silica monoliths and applied for successful detection and recovery of Pd(II) ions with high selectivity and sensitivity. The effects of various parameters such as pH, contact time, initial concentration, selectivity and sensitivity, on the detection and sorption of Pd(II) by the adsorbent were investigated. The solution pH played an important role for detection and sorption but the present captor worked well in acidic pH region at 3.50. The data clarified that the adsorbent was able to detected even ultra-trace Pd(II) ions, which was unique feature of the sensor ensemble adsorbent material. The adsorbent offered simple, one-step detection procedure without the need of highly sophisticated instruments. The adsorbent exhibited significant ion-selectivity toward the Pd(II) in multi mixture of spike solution as environmental samples. The results showed that the maximum sorption capacity was found at pH 3.50 and adsorbent was selectively adsorbed Pd(II) ions from binary and multi mixtures even in the presence of various competing ions. The sorption isotherm was well described and the maximum sorption capacity was as high as 163.13mg/g. The adsorbent was stable without significant loss of sorption and recovery performances even after several reuses cycles.

Composição química e eficácia da multimistura como suplemento dietético: revisão da literatura

The aim of this work was to identify all papers already published on the nutritional supplement known as multimixture (MM) in journals with high level of scientific rigor and to evaluate the effectiveness of this product as a food supplement. The methodology was based on searching at Medline and Scielo databases, without limit of date, using the keyword multimixture. Thirty one articles were analyzed. Because of the small portion that is recommended for daily consumption, the MM cannot be considered an important source of energy, protein and minerals. Its high proportion of magnesium and/or calcium can impair the absorption of iron. Its use increases the fiber content of the diet, which can reduce the absorption of nutrients, which is not interesting in the case of malnourished children. Its high amount of phytate seems to be no problem because the prior treatment to which the bran is submitted reduces the chelating power of this compound. The possibility of poisoning by cyanide come from the cassava leaf is not discarded. Regarding the ability to promote the nutritional state, 12 out of 15 studies concluded its ineffectiveness. Considering risks and benefits and the available evidence in the literature, is not justified the use of MM as a strategy for prevention and control of malnutrition.

Regional low-cost diet supplement improves the nutritional status of school children in a semi-arid region of Brazil

Non-governmental organizations (NGOs) in Brazil have used an alternative diet supplement known as multimixture (MM) composed of bran cereals, cassava leaf powder and eggshell powder. This study investigated the effectiveness of this MM supplement used concomitantly with other actions to improve children’s health. Thirty-one students enrolled in a rural school were examined for anthropometric and hematologic measures before and after the consumption of diet supplemented with MM. The results were compared with those from control group (n = 26) who consumed the same diet without MM. At the end of the study, the NGO intervention provided a beneficial effect on the nutritional status of children, since it improved their blood parameters and reduced the anemia independently of MM supplementation. The average height/age was significantly higher only in the group that received MM. The supplementation of the deficient diets with MM contributed significantly to the improvement of the children’s stature.

Influência da multimistura na gestação de ratas: pesos materno e fetal e triglicerídeos séricos

O presente estudo visa determinar a influência da multimistura (MM) sobre o ganho de peso materno e fetal e sobre a hipertrigliceridemia materna no final do período gestacional. Foram utilizadas ratas Wistar (n= 120), divididas em quatro grupos: a) à base da dieta habitual do Estado do Rio de Janeiro (HERJ); b) à base da dieta habitual do Estado do Rio de Janeiro adicionada de 2% de MM (HERJ+MM); c) à base de caseína (CAS1) com 12% de proteína; d) controle caseína (CAS2) com 20% de proteína. Os pesos materno e fetal foram registrados semanalmente nos dias 7, 14 e 21 do experimento. Para a determinação dos triglicerídeos séricos (mg/dL) foram usados Kits BioClin (Química Básica-Quibasa, BH). De acordo com os resultados, a complementação da dieta HERJ com 2% de multimistura não aumentou o ganho de peso materno e fetal e não alterou a hipertrigliceridemia fisiológica. Conclui-se que a utilização da multimistura, na proporção usada durante a gestação, não possui nenhum efeito sobre os parâmetros estudados.