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Diogo Horst

Universidade Federal de São Paulo (UNIFESP), Exact and Earth Sciences, Post-Doc

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Post-Doctorate in Engineering and Mechanical Sciences, Federal University of Santa Catarina, UFSC (2018-2019). D.Eng of Production from Federal University of Technology - Paraná, UTFPR (2016). M.Eng of Production from Federal University of Technology - Paraná (2013). Bachelor's at Biology from Leonardo da Vinci Universitary Center (2009). Bachelor's at Mechanical Technology from Santa Catarina State University, UDESC (2010). Profissional Technician in Electromechanics from National Service
of Industrial Apprenticeship, SENAI (2005). Currently is a researcher in the following areas: Bioengineering, Nanotechnology, Graphene and Carbon Byproducts, Ceramic Materials, Polymerics and Metals, Electro-Mechanics, Renewable Energies, and Innovation, Technology and Sustainability

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Papers by Diogo Horst

3D-Printed Conductive Filaments Based on Carbon Nanostructures Embedded in a Polymer Matrix: A Review

3D-Printed Conductive Filaments Based on Carbon Nanostructures Embedded in a Polymer Matrix: A Review, 2019

Conductive and magnetic filaments are revolutionizing three-dimensional printing (3DP) to a new l... more Conductive and magnetic filaments are revolutionizing three-dimensional printing (3DP) to a new level. This review study presents the current state of the art on the subject, summarizing recent high impact studies about main advances regarding the application of 3DP filaments based on carbon nanostructures such as graphene, carbon fibers, nanotubes, and conductive carbon black embedded in
a polymer matrix, by reviewing its main characteristics and showing the main producers and also the products available on the market. The availability of inexpensive, reliable, and electrically conductive material will be indispensable for the fabrication of circuits and sensors before the full potential of 3DP for customized products incorporating electrical elements can be fully explored.

UMA VISÃO GERAL SOBRE O POTENCIAL DE GERAÇÃO DE ENERGIAS RENOVÁVEIS NO BRASIL ROBERTO BONDARIK, LUIZ ALBERTO PILATTI e DIOGO JOSÉ HORST

RESUMO Este trabalho fornece uma revisão abrangente sobre o esta-do atual do setor elétrico brasi... more RESUMO Este trabalho fornece uma revisão abrangente sobre o esta-do atual do setor elétrico brasileiro e discute a diversificação do mix de geração de eletricidade como uma estratégia para melhorar a segurança do fornecimento de eletricidade no país. Uma visão geral das principais características das fontes de energia aplicadas no Brasil é apresentada por meio de uma revisão dos últimos dados de geração disponíveis. Pretende-mos mostrar oportunidades para a penetração de novas fontes renováveis de energia no mix energético brasileiro, permitindo que o país continue gerando uma quantidade elevada de ener-gia limpa em comparação com a média mundial. Os resulta-dos mostram que é necessário aproveitar os programas gover-namentais de incentivo a geração de eletricidade a partir de fontes limpas, há espaço para aproveitamento da biomassa e desenvolvimento de seus biocombustíveis, carvão e gás natural, desenvolvimento de parques eólicos e solares, aproveitamen-to de energia das marés, sistemas de cogeração e de geração híbridos, entre outros. Estes esforços devem ser empregados como uma estratégia para melhorar a segurança do forneci-mento de eletricidade do país posicionando-o como líder no contexto mundial de geração de energia elétrica a partir de fontes renováveis.

Additive Manufacturing at Industry 4.0: a Review

by Diogo Horst and Charles Duvoisin

International Journal of Engineering and Technical Research, 2018

— Industry 4.0 is the recent move into intelligent technology automation. In this new era the use... more — Industry 4.0 is the recent move into intelligent technology automation. In this new era the use of modern skills of Additive Manufacturing within the context of information technology integration plays an important role in industrial economic competitiveness. This short review provides a basic understanding of the role of 3DP technology in the Industry 4.0. As can be seen, there's no doubt that 3DP technologies are leading to the next major industrial revolution. Due its versatility the Additive Manufacturing plays a key-role in the Industry 4.0, saving time and costs, being decisive for process efficiency and reducing its complexity, allowing for rapid prototyping and highly decentralized production processes. Currently, more and more industrial segments are adopting AM. The smart factories of the future have all processes interconnected by the Internet of Things, incorporating greater flexibility and individualization of manufacturing processes.

Interactive System of LED-Studs for Road Signaling Using Arduino Platform and C++ Programming Language

by Diogo Horst, Charles Duvoisin, and André Pscheidt

This study presents the elaboration of a Lighting Emission Diode (LED)-stud interactive system fo... more This study presents the elaboration of a Lighting Emission Diode (LED)-stud interactive system for road signaling. The prototype is based in Arduino platform programmed in C++ language. The electronic circuit is powered by solar energy, which receives and retransmits information pre-defined by the user to the other road studs via Global System of Mobile Communications (GSM) module. The road studs were designed and three-dimensionally printed (3DP) using yellow polylactic-acid (PLA) filament, however the proposed circuit can also internally integrate other conventional road studs. The solar panel connected to an internal battery for independent power storage was able to power the electronic circuit during 12 uninterrupted hours. The results show that, in addition to the luminous interactivity set by the user as desired, the prototype in question exceeds the brightness and reflectivity light levels of conventional road studs, thereby improving the driver's perception of the track, thus reducing the risk of causing accidents.
KEYWORDS - Led-Stud, Luminous interactivity, Road safety, Signaling, Traffic control and management.

An Overview on Properties, Production Mechanisms and Applications of Graphene

Recent years have witnessed a revolution in graphene and its applications. Today, it is a hot top... more Recent years have witnessed a revolution in graphene and its applications. Today, it is a hot topic in science and engineering circles, and attracts more and more interest. This short review article presents the main contributions of research on graphene and its properties, production mechanisms and potential applications. The bibliographic review was performed searching in the Scopus, Web of Science, ScienceDirect, SciELO and Google Scholar scientific databases. As can be seen, the optimal properties of graphene makes it a revolutionary precursor key-material for research and development (R&D) to be applied in many fields such as: energy storage, electronics, purification and decontamination, oil and gas, catalysis, thin films, sensors and biosensors, composite materials among many others applications to be discovered.

3D Printing of Pharmaceutical Drug Delivery Systems

Three-dimensional printing (3DP) enables the development of diverse geometries through computer ... more Three-dimensional printing (3DP) enables the development of diverse geometries through computer aided design using different techniques and materials for desired applications such as pharmaceutical drug delivery medicine. The FDA approval (2015) of printed-medicine opens up an unprecedented opportunity for the discovery of new compounds and technologies for the pharmaceutical industry development. This report shows some advantages, limitations, challenges and perspectives in concerning to 3DP of pharmaceutical grade formulations and polymers used for drug delivery systems.

Perspectives over the Brazilian Iron-Niobium Production

Niobium is a chemical element, symbol Nb, atomic number 41 (41 protons and 41 electrons) and atom... more Niobium is a chemical element, symbol Nb, atomic number 41 (41 protons and 41 electrons) and atomic mass 92.9 u. It is a transition element belonging to the group 5 or 5B of the periodic classification of the elements. The name derives from the Greek goddess Níobe, daughter of Dione and Tantalus -the latter, in turn gave name to another element of the family 5B, tantalum. It is used mainly in alloys of steel for the production of conductive tubes of fluids. Under normal conditions, it is solid. It was discovered in 1801 by the Englishman Charles Hatchett [1].

Bioactive Potential of 3D-Printed Oleo-Gum-Resin Disks: B. papyrifera, C. myrrha, and S. benzoin Loading Nanooxides—TiO2, P25, Cu2O, and MoO3

by Diogo Horst and Rogerio de Almeida Vieira

Bioinorganic Chemistry and Applications, 2017

This experimental study investigates the bioactive potential of filaments produced via hot melt e... more This experimental study investigates the bioactive potential of filaments produced via hot melt extrusion (HME) and intended for fused deposition modeling (FDM) 3D printing purposes. The oleo-gum-resins from benzoin, myrrha, and olibanum in pure state and also charged with 10% of metal oxide nanoparticles, TiO 2 , P25, Cu 2 O, and MoO 3 , were characterized by ultraviolet-visible (UV-Vis) and Fourier transform infrared (FTIR) spectroscopy, energy-dispersive X-ray microanalysis (EDXMA), scanning electron microscopy (SEM), and differential scanning calorimetry (DSC). Disks were 3D-printed into model geometries (10 × 5 mm) and the disk-diffusion methodology was used for the evaluation of antimicrobial and antifungal activity of materials in study against the clinical isolates: Staphylococcus aureus, Pseudomonas aeruginosa, Escherichia coli, and Candida albicans. Due to their intrinsic properties, disks containing resins in pure state mostly prevent surface-associated growth; meanwhile, disks loaded with 10% oxides prevent planktonic growth of microorganisms in the susceptibility assay. The microscopy analysis showed that part of nanoparticles was encapsulated by the biopolymeric matrix of resins, in most cases remaining disorderly dispersed over the surface of resins. Thermal analysis shows that plant resins have peculiar characteristics, with a thermal behavior similar to commercial available semicrystalline polymers, although their structure consists of a mix of organic compounds.

Bactericidal Activity of Oleo-gum Resins Doped with Metal Oxides

This work aimed to evaluate the bactericidal activity of vegetable oil-gum resins (Styrax benzoin... more This work aimed to evaluate the bactericidal activity of vegetable oil-gum resins (Styrax benzoin, Commiphora mirrha, and Boswellia papyrifera) doped with metal oxides (TiO 2 , P25, MoO 3 e Cu 2 O) in nanometric dimension. The in vitro susceptibility of pathogenic Gram-negative bacteria E. coli was accessed. The antibiogram essay was performed using the semi-quantitative method Kirby-Bauer (KB) agar diffusion test. The materials obtained were characterized by ultraviolet visible (UV-Vis) spectrophotometry, additionally; its morphology was characterized by scanning electron microscopy (SEM). The results show that in most cases the materials present bactericidal activity, thereby inhibiting both planktonic and surface associated growth of this microorganism.

Thermo-Mechanical Evaluation of Novel Plant Resin Filaments Intended for 3D Printing

— With the development of three-dimensional printing technologies (3D) for rapid prototyping, new... more — With the development of three-dimensional printing technologies (3D) for rapid prototyping, new materials are being constantly researched, but not all have the necessary characteristics to be used for this purpose. The cost of materials commonly used for this application and their reuse limitations are aspects that must be taken into account and involve the search for low-cost and more environmentally friendly new replacement materials. The aim of this study is to evaluate some properties and the application of natural plant resins as possible materials for 3D printing by using the technique fused deposition modeling (FDM). The filaments were manufactured via hot melted extrusion (HME). The tests made include the determination of density, mechanical evaluation of materials (tensile and compressive strength) and also the analysis of their thermal behavior by differential scanning calorimetry (DSC). According to the results, materials showed lowest tensile and compressive strength when compared to other plastics commercially available, nevertheless the resins present excellent molding to be extruded in the manufacturing of filaments and successfully 3D printed, using relative lower temperatures.

Assessing the Lignin Fraction Extracted from Brazilian Energy Crops

American Journal of Environmental Sciences, 2015

This study quantifies the extraction performance and some properties of the lignin obtained from ... more This study quantifies the extraction performance and some properties of the lignin obtained from six crops with potential for generating thermal energy in Brazil. A full factorial design (2 2 ) with four replicates including two extraction methods and two particles size distributions was adopted for assessing the fraction of lignin, as well as its Higher Heating Value (HHV) and composition given by the proximate and ultimate analysis. It was verified that in all cases the HHV of the lignin is greater than that obtained for the respective raw material, suggesting that these lignins could be also used as fuel in thermochemical processes. The ANOVA analysis showed that at 95% of confidence level the lignin yield is influenced by the extraction methods, which employ different pH values during the hydrolysis treatment. In addition, it was found that, in most cases, a smaller biomass particle size contributed to more effective lignin extraction. Response surfaces were also included in order to show tendencies of the lignin yield obtained for each raw material in function of the pH value used by the extraction method and the biomass particle size range.

Quality of Working Life and Productivity: An Overview of the Conceptual Framework

by Diogo Horst and Luís Serpe

This study aimed to discuss some relationships regarding the Quality of Working Life (QWL) and hu... more This study aimed to discuss some relationships regarding the Quality of Working Life (QWL) and human productivity performance. For this, a bibliographical review was raised achieving the theoretical foundation to support this discussion, the research question was: in nowadays is already possible to think in an effective quality of working live dissociated from productivity? From results, we evidenced that substantial loss of productivity was related with absenteeism presenteeism and several work-diseases, consequently decreasing the health and welfare of employee's. Moreover, the management of quality must influence the decisions of employee's, thus enhancing their commitment and insuring self-wellness, ergo increasing their productivity. Concluding, the harms which afflict humans are the result between the combinations of their work development with their lifestyle outside of work.

Analysis HPLC of compounds obtained from diluted acetic acid hydrolysis using wastes from Brazilian wood species

This paper reports the application of a high performance liquid chromatography (HPLC) analysis fo... more This paper reports the application of a high performance liquid chromatography (HPLC) analysis for mapping the chemical compounds obtained in hydrolysate liquor using twelve different wastes from Brazilian woods species. The HPLC was used for the analysis of: short chains organic acids, monosaccharides, glycerol and ethanol by employing the analytical proton-exchange technique. Also, the performances of diluted acetic acid (CH3COOH) in hydrolysis with subsequent fermentation by using the Saccharomyces cerevisiae yeast were investigated. The yeast showed ethanol productivities between 0.21 g/L/h using Ocotea catharinensis and 0.73 g/L/h using Balfourodendron riedelianum, after 8 hours of fermentation essay. Most species analyzed in this study, which had not been related before, showed similar potential as emerging biomasses for biofue

African Journal of Business Management A diagnosis of knowledge management measuring incubated companies' performance: A study case

This study is aimed at recognizing how knowledge is captured, created, stored and used in two inc... more This study is aimed at recognizing how knowledge is captured, created, stored and used in two incubated companies. The survey was conducted at the " Intecponta Incubator " , located at the city of Ponta Grossa-PR, South-Brazil. The Knowledge Management Diagnostic (KMD) proposed by Bukowitz and Williams (2002) was applied. The efforts made were in regard to understand if the method could be used in identifying knowledge generation and consequently increase performances. The data collection occurred through a questionnaire answered by the managers. The KMD is divided into: tactical and strategic process and composed by seven different sections: Get, Use, Learn, Contribute, Assess, Build / Maintain and Discard. Each section was specifically distributed allowing the evaluation of the whole organization or a single sector. Both companies achieved positive results among sections, with results in most times even above the average stipulated by the authors (obtaining general avera...

Open or Closed? Macroergonomics Approaching Socio-Technical Systems Productivity: An Overview of the Conceptual Framework

Volume 3, Issue 2 February, 2015 Pages: [98][99][100][101][102][103][104][105][106][107][108][109... more Volume 3, Issue 2 February, 2015 Pages: [98][99][100][101][102][103][104][105][106][107][108][109][110][111][112][113][114][115] Purpose: The aim of this study is to discuss the motivations which lead to justify an apparent dichotomy between the open and closed systems in regarding to productivity, by questioning, how business organizations can become macroergonomically more productive? Methodology: A literature review was performed to achieve the theoretical foundation supporting the discussion; this research has exploratory nature based on its conceptual framework. Findings: Nowadays, a usable tool for solving this problem is macroergonomics a hybrid system which takes into accounts both the organizational characteristics and human factors. Even that based on sociotechnical theory, macroergonomics displays systems as organic and open, integrating the interface human-technology, thereby resulting in a more effective work system. Moreover, the construction of a model organization with a satisfactory level of productivity must arise from a set of actions to be taken after a macroergonomic analysis on the productive scene, considering the human, technological and environmental aspects, freeing these old paradigms from a series of moorings and constraints aroused from the classic organizational models of production, which have gained force over the twentieth century.

Systematic review: an analysis model for measuring the coopetitive performance in horizontal cooperation networks mapping the critical success factors and their variables

The Annals of Regional Science, 2014

Several strategies have been developed for micro-enterprises and small enterprises in relation to... more Several strategies have been developed for micro-enterprises and small enterprises in relation to their competitiveness enhancement. In recent years, one of the most widespread strategies has been the formation of horizontal cooperation networks (HCNs), based on the evolutionary development of coopetition. This study aimed to support and validates an analysis model developed by Petter (Modelo para análise da competitividade de redes de cooperação horizontais de empresas, Universidade Tecnológica Federal do Paraná, UTFPR, Ponta Grossa, 2012), in order to point out which are critical success factors (CSF), and their variables which influence the coopetition performance of a HCN under aspects of cooperation and competitiveness. A systematic review supported by Sampaio and Mancini (Revista Brasileira de Fisioterapia 11(1): [83][84][85][86][87][88][89] 2007) was used to measure the status quo of published journals related to the subject, among several databases. A large informational gap was found concerning the development of methods and tools, as well as subsidies.

HPLC mapping of second generation ethanol production with lignocelluloses wastes and diluted sulfuric hydrolysis

by Theodoro M. Wagner and Diogo Horst

Acta Scientiarum. Technology, 1974

Wood wastes are potential material for second generation ethanol production within the concept of... more Wood wastes are potential material for second generation ethanol production within the concept of residual forest bio-refinery. Current paper reports on ethanol production employing an HPLC method for monitoring the chemical content dispersed in the hydrolysate liquor after fermented. The proton-exchange technique was the analytical method employed. Twelve types of wood chips were used as biomass, including Hymenolobium petraeum, Tabebuia cassinoides, Myroxylon peruiferum, Nectandra lanceolata, Ocotea catharinensis, Cedrelinga catenaeformis, Cedrela fissilis Vell, Ocotea porosa, Laurus nobilis, Balfourodendron riedelianum, Pinus Elliotti and Brosimum spp. The influence of diluted sulfuric hydrolysis on the yeast Saccharomyces cerevisiae during the fermentation assay was also investigated. Standard compounds mapped in the analysis comprised fructose, lactic acid, acetic acid, glycerol, glucose and ethanol. The yeast showed ethanol productivity between 0.75 and 1.91 g L -1 h -1 , respectively, without the addition of supplementary nutrients or detoxification. The use of these materials for the bioconversion of cellulose into ethanol has been proved. Current analysis contributes towards the production of biofuels by wastes recovery and by process monitoring and optimization.

An experimental comparison of lignin yield from the Klason and Willstatter extraction methods

by João Kovaleski, Diogo Horst, and Jhon Jairo Ramírez Behainne

Energy for Sustainable Development, 2014

This work compares the performance of two lignin extraction methods applied to several crops grow... more This work compares the performance of two lignin extraction methods applied to several crops grown in Brazil and contributes to identify the biomass with more potential for generation of thermal energy from the point of view of its lignin content and properties. A full factorial (2 2 ) design involving two particle size distribution (105 to 500 μm and 1000 to 2000 μm) and two extraction methods (Klason and Wilstatter) were chosen as controlled factors for the tests, including the determination of granulometry, extractives and holocelluloses, higher heating values, and the proximate and ultimate analysis. Results showed that lignins obtained utilizing both methods have elevated higher heating values, suggesting they could generate thermal energy from thermochemical processes, mainly those lignins extracted from the Klason method. Even though the tendency for obtaining more lignin yield by using the Klason extraction method and fine particles was observed for almost all raw material tested, the statistical analysis suggested that for the experimental range studied the extraction method and the particle size distribution do not affect the lignin yields at 95% of confidence level (p-value b 0.05), except the lignin yield obtained from sugarcane bagasse. For this biomass, the extraction method chosen led to relevant differences in the lignin yield (22.6% by using Willstatter to 24.9% by using Klason), suggesting that the lower pH level used by the Klason method promotes a more efficient lignin extraction.

Comparative Analysis of Different Acids Utilization for Cellulosic Hydrolysis by Using Brazilian Wood Wastes for Fibers and Bioethanol Production Yields

Revista Gestão Industrial, 2011

The main objective of this paper is to determine the hydrolysis efficiency by using four differen... more The main objective of this paper is to determine the hydrolysis efficiency by using four different diluted treatment acids: sulfuric (H 2 SO 4 ), nitric (HNO 3 ), phosphoric (H 3 PO 4 ), and acetic (CH 3 COOH), in an attempt to improve the fibers and bioethanol production levels. In this study twelve Brazilian woods were investigated, including native and exotic species, hardwoods and softwoods. Processes to use wood waste recovery established to produce ethanol and cellulosic fibers simultaneously were carried out. For fermentation essay, a wild line of Saccharomyces cerevisiae yeast was investigated. The incomes related to hydrolysis efficiency, ethanol yields, fibrous fractions efficiency, and plus glucose and delignification levels using acid and alkaline treatments were tested. From the results it is possible to join the production of ethanol and cellulosic fibers simultaneously using wood chips, and due to the complexity of the analyzed material it´s still possible to isolate byproducts. Also from results, the yeast demonstrated to be efficient with an estimate maximum production of 12.94 liters per 100 kg of biomass using Balfourodendron riedelianum specimen and sulfuric acid hydrolysis. All acids and samples demonstrated high and similar efficiency in hydrolysis, indicating that these are feasible for the processes.

HPLC FOR IDENTIFICATION OF COMPOUNDS IN DILUTED PHOSPHORIC (H3PO4) TREATMENT IN CELLULOSIC ETHANOL PRODUCTION

by Theodoro M. Wagner and Diogo Horst

This paper reports an ethanol production by using cellulosic residues also using a method for ide... more This paper reports an ethanol production by using cellulosic residues also using a method for identification of the compounds dispersed in diluted phosphoric hydrolysate treatment. Twelve different wood chips collected in southern regions of Brazil were used. High performance liquid chromatography (HPLC) employing analytical proton-exchange technique was used. The fermentation ability plus ethanol yields by using Saccharomyces cerevisiae were investigated. Standard compounds identified in analysis were: fructose, lactic acid, acetic acid, glycerol, glucose and ethanol. The yeast showed good ethanol productivities in ranges between: 3.11 g/L/h in Myroxylon peruiferum and 1.74 g/L/h in Nectandra lanceolata, respectively, after the essays. The waste materials showed similar efficiency in ethanol production. This paper contributes to the sustainable biofuels production through the process monitoring and optimization, contributing to the renewable energies through the engineering of prod...