Chemical Functions
Mostrando 1-12 de 375 artigos, teses e dissertações.
-
1. Aprendizagem cooperativa e colaborativa no ensino de equilíbrio químico a calouros
COOPERATIVE AND COLLABORATIVE LEARNING TO TEACH CHEMICAL EQUILIBRIUM TO FRESHMAN STUDENTS. This paper describes cooperative (jigsaw) and collaborative activities (Peer-Led Team Learning) carried out in the BSc degree in Chemistry at the São Carlos Institute of Chemistry, the University of São Paulo, Brazil. The dynamics of discursive interactions establish
Química Nova. Publicado em: 2022
-
2. The importance of education
Abstract The present research is dedicated to analyzing the addition of sawdust biomass, which is a carbonaceous raw material that may be used in coal blends for the production of metallurgical coke, preserving the required quality, with lower cost. The quality of metallurgical coke may be determined by the efficiency of its chemical, physical and thermal fu
REM, Int. Eng. J.. Publicado em: 2021-06
-
3. Quality evaluation of metallurgical coke produced with sawdust and different mixtures of coal
Abstract The present research is dedicated to analyzing the addition of sawdust biomass, which is a carbonaceous raw material that may be used in coal blends for the production of metallurgical coke, preserving the required quality, with lower cost. The quality of metallurgical coke may be determined by the efficiency of its chemical, physical and thermal fu
REM, Int. Eng. J.. Publicado em: 2021-06
-
4. EVALUATION OF THE CHEMICAL COMPOSITION AND STRUCTURE OF ASPHALTENES FROM THREE OFFSHORE BRAZILIAN BIODEGRADED HEAVY OILS
Asphaltenes fractions were extracted and purified from three heavy Brazilian oils. Their mass compositions of C, H, N, Ni and V were obtained from elemental analysis and S and O atomic percentages from EDS. The H/C ratios showed high degree of unsaturation, while the O atomic percentages indicated more pronounced biodegradation effects on two samples. Quanti
Quím. Nova. Publicado em: 2021-04
-
5. DETERMINAÇÃO DE FÓSFORO EM PALEOSSEDIMENTOS EMPREGANDO ESPECTROMETRIA DE FLUORESCÊNCIA DE RAIOS-X PORTÁTIL
Phosphorus (P) is an important chemical marker of the past human presence, because, besides indicates the localization of possible archaeological sites, also, contributes to clarify doubts regarding to origin, duration and to specific functions that were developed in them. The present study aimed to obtain a simple, accurate, fast and non-destructible analyt
Quím. Nova. Publicado em: 2021-02
-
6. PEDOTRANSFER FUNCTION TO ESTIMATE THE SOIL STRUCTURAL “S” INDEX AND SPATIAL VARIABILITY IN AN OXISOL WITHIN A LIVESTOCK FARMING SYSTEM
ABSTRACT Various attributes are often required to build soil quality indicators. However, determining these attributes is time-consuming and requires several specific devices. Thus, it is desirable to develop indexes that express soil quality based on easily determined attributes. The objective of this study was to investigate the spatial variability of the
Eng. Agríc.. Publicado em: 2020-02
-
7. Phyto- and Bio-Chemical evaluation of Diospyros kaki L. cultivated in Egypt and its biological activities
Resumo Diospyros kaki L. ou Costata é a principal variedade de caqui progressivamente consumida no mercado e exportação egípcia. O objetivo deste estudo foi investigar os efeitos bioprotetores do extrato alcoólico de frutos e folhas de D. kaki utilizando modelos de ratos “in vivo”. Extratos de éter de petróleo provenientes de frutos e folhas foram
Braz. J. Biol.. Publicado em: 05/08/2019
-
8. RELIABILITY-BASED MULTI-OBJECTIVE OPTIMIZATION APPLIED TO CHEMICAL ENGINEERING DESIGN
ABSTRACT Chemical engineering optimization represents a significant challenge due to the complexity of the mathematical models that are frequently required in this area. These models are normally associated with nonlinear equations that represent mass, energy, and momentum balances, which are submitted to physical, constitutive, environmental, and design lim
Braz. J. Chem. Eng.. Publicado em: 15/07/2019
-
9. Action of two endocrine disrupters on the sexual differenciation of Nile tilapia
RESUMO Desreguladores endócrinos são substâncias exógenas que possuem a capacidade de alterar uma ou várias funções do sistema endócrino com efeitos adversos a saúde um organismo intacto. O objetivo principal do presente trabalho foi avaliar a ação dos desreguladores endócrinos 17β-estradiol (E2) e 17α-etinilestradiol (EE2) na diferenciação s
Rev. Ciênc. Agron.. Publicado em: 04/07/2019
-
10. Mapping Soil Cation Exchange Capacity in a Semiarid Region through Predictive Models and Covariates from Remote Sensing Data
ABSTRACT: Planning sustainable use of land resources requires reliable information about spatial distribution of soil physical and chemical properties related to environmental processes and ecosystemic functions. In this context, cation exchange capacity (CEC) is a fundamental soil quality indicator; however, it takes money and time to obtain this data. Alth
Rev. Bras. Ciênc. Solo. Publicado em: 18/10/2018
-
11. Effect of Partial and Total Replacement of Inorganic by Organic Microminerals Sources on the Quality of Broiler Carcasses
ABSTRACT Among the nutrients involved in the chicken diet, the microminerals deserve attention as they exert essential functions in the organism. These compounds can be provided in inorganic (traditional) and organic (chelate) forms. In organic form, the micromimerals can attend a new concept related to a better bio-availability. In this sense, the objective
Braz. arch. biol. technol.. Publicado em: 08/01/2018
-
12. MgO Saturation Analisys of CaO-SiO2-FeO-MgO-Al2O3 Slag System
Electric arc furnace (EAF) slag has a range of functions, including improving energy efficiency through the "slag foaming" phenomenon. As such, the study of slag is important in EAFs. One of the factors that determine foaming quality and efficiency is the presence of solid particles. MgO saturation is highly significant since, in addition to ensuring the pre
Mat. Res.. Publicado em: 30/11/2017