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HUGO VALENÇA DE ARAÚJO,JOSÉ VICENTE HALLAK D'ANGELO 대한설비공학회 2014 International Journal Of Air-Conditioning and Refr Vol.22 No.4
Alcoholic fermentation is one of the most important stages in industrial ethanol productionprocess, involving a biochemical and exothermic reaction. Sometimes cooling towers are notcapable of supplying a cold utility with a temperature low enough to maintain the fermentativemedium temperature in a desirable range. Absorption Refrigeration Systems (ARS) appears to bea good alternative to obtain the necessary refrigeration for the fermentation process. The aim ofthe present paper was to carry out a thermodynamic analysis of ARS, evaluating their performancethrough the First and Second Laws of Thermodynamics. ARS with different con¯gurationswere studied (single-effect and double-effect with series, parallel and reverse parallel flows), all ofthem operating with water/lithium bromide mixture as working pair, under different operatingconditions in order to satisfy the cooling load required by an industrial alcoholic fermentationprocess. Another objective of this paper was to investigate the risk of LiBr crystallization, whichcan result in scaling formation, with the aid of the solid–liquid phase equilibrium curve of H2O/LiBr mixture. Among the double-effect con¯gurations studied, it was observed that series flow presents the more signi¯cant crystallization risk, which represents a limit to improve its First andSecond Law performances. It was veri¯ed that the Second Law performance for the single-anddouble-effect ARS analyzed are similar, but their First Law performance are considerably different. This is due to the amount and quality of the heat consumed in the first effect generators ofthese systems. For a base case studied, First Law performance measured by coefficient of performance(COP) of double-effect ARS is 72% greater than the one for single-effect, while forSecond Law performance, measured by exergetic efficiency, an increase of 5% was observed.
Cementitious Porous Material Applied to Precision Aerostatics Bearings
Leandro Jos da Silva,Tulio Hallak Panzera,Luciano Machado Gomes Viera,Christopher Rhys Bowen,Jaime Gilberto Duduch,Juan Carlos Campos Rubio 한국정밀공학회 2018 International Journal of Precision Engineering and Vol.19 No.2
The use of porous materials as restrictor in aerostatic bearings provides many advantages over conventional restrictors, such as small variation of temperature, high damping, high operational speeds, limited wear and capacity to support radial, axial, and combined loads, being considered important features for precision machines and instruments. This work evaluates the load carrying capacity for different air gaps and pressures of thrust porous bearing made with cementitious composites. The cementitious composites consisted of Portland cement and monomodal silica particles (44 μm) were fabricated via uniaxial cold-pressing (10 MPa). The load capacity was determined for different air pressures, such as 3, 4, 5 and 6 bar. The air gap was measured using pneumatic transducers. A pneumatic instability was observed when the air pressure level increased from 3 to 6 bar. A similar loading capacity, for bearing gaps between 7 and 30 μm, was achieved in comparison to hot-pressed porous alumina found in the literature. In addition, the cementitious porous bearing provided a superior loading capacity for gaps higher than 10 μm when compared to graphite porous bearing found in the literature. The results revealed the cementitious composites are promising materials for porous restrictor in aerostatic thrust bearings.
The Effects of Acupuncture on Peripheral Facial Palsy Sequelae after 20 Years via Electromyography
Saulo Fabrin,Nayara Soares,Simone Cecilio Hallak Regalo,Edson Donizetti Verri 사단법인약침학회 2015 Journal of Acupuncture & Meridian Studies Vol.8 No.5
Objective: This research used electromyography to evaluate the effects of acupuncture on facial palsy peripheral sequelae. Methods: The 44-year-old woman who participated in this study presented sequelae resulting from 20 years of peripheral facial nerve palsy (FNP) on the right side and synkinesis in the left eye. In electromyography, the electrodes were positioned on the motor points over the orbicularis oris and the orbicularis oculi muscles to establish myofunctional feedback prior to and after rehabilitation, which consisted of 20-minute sessions of acupuncture once per week for 20 weeks: using manual stimulation at acupoints Yintang, LR3, GB21, CV17, ST2, ST3, ST6, ST7, GB2, and SI19; and Tou-Kuang-Min and ST4 using electrical stimulation with a 4-Hz pulsed current. The subjective pain intensities were recorded. Results: The root-mean-square (RMS) electromyographic comparative analysis showed greater activation and recruitment of muscle fibers on the right side and a reduced overload on the left side, which promoted a functional evolution of movements and a positive response in the stomatognathic system. Conclusion: Acupuncture associated with electrical stimulation reversed the peripheral facial paralysis in a short time. Severe sequelae were minimized due to the balance of muscle activation in response to the electrical stimulation provided by the acupuncture needles.
Saulo Fabrin,Nayara Soares,Daiana Pezarezi Yoshimura,Simone Cecilio Hallak Regalo,Edson Donizetti Verri,Jacqueline Rodrigues de Freitas Vianna,Eloisa Maria Gatti Regueiro,Josie Resende Torres da Silva 사단법인약침학회 2016 Journal of Acupuncture & Meridian Studies Vol.9 No.1
This study evaluated the effectiveness of YinTang and ChengJiang acupoints on patients with cardiac arrhythmia and neurocardiogenic syncope in emergency first aid. A 45 year old woman underwent acupuncture. She had a previous history of a valvuloplasty for rheumatic disease and two acute myocardial infarctions, followed by four catheterizations and an angioplasty. Needling of the YinTang acupoint and stimulation of the ChengJiang acupoint through acupressure were performed for 20 minutes soon after syncope and during tachycardia, hypertension, tachypnea, and precordial pain, without any effect on peripheral oxygen saturation (SpO2) or the glycemic index. Data were analyzed comparatively by using the following parameters at rest, during syncope, and at 1 minute and 10 minutes after an emergency acupuncture procedure: blood pressure; heart rate; SpO2; and respiratory rate. We found that acupuncture at YinTang and ChenJiang acupoints induced cardiovascular responses, increased the limits of the body's homeostasis, and normalized the patient's condition in the case of syncope. Acupuncture using a combination of ChengJiang and YinTang acupoints had an immediate effect on the autonomic nervous system and on maintaining homeostasis and energy balance in the body. Although this technique was effective, the patient was still referred to the Emergency Room.
Claudio H. B. de Resende,Luiz F. Martha,Afonso C. C. Lemonge,Patricia H. Hallak,Jose P. G. Carvalho,Julia C. Motta Techno-Press 2023 Advances in computational design Vol.8 No.4
This article explores how multi-objective optimization techniques can be used to design cost-effective and structurally optimal spatial steel structures, highlighting that optimizing performance can be as important as minimizing costs in real-world engineering problems. The study includes the minimization of maximum horizontal displacement, the maximization of the first natural frequency of vibration, the maximization of the critical load factor concerning the first global buckling mode of the structure, and weight minimization as the objectives. Additionally, it outlines a systematic approach to selecting the best design by employing four different evolutionary algorithms based on differential evolution and a multi-criteria decision-making methodology. The paper's contribution lies in its comprehensive consideration of multiple conflicting objectives and its novel approach to simultaneous consideration of bracing system, column orientation, and commercial profiles as design variables.
Eco-friendly Sandwich Panel Based on Recycled Bottle Caps Core and Natural Fibre Composite Facings
Pablo Resende Oliveira,Julio Cesar dos Santos,Sergio Luiz Moni Ribeiro Filho,Bruna Torres Ferreira,Tulio Hallak Panzera,Fabrizio Scarpa 한국섬유공학회 2020 Fibers and polymers Vol.21 No.8
This is the first attempt to combine disposed bottle caps and natural fibres into sandwich panels. A full factorialdesign is performed to identify the effects of the skin type (aluminium or coir fibre reinforced laminates) and bottle cap corepacking (cubic and orthotropic) on the mechanical properties of the proposed panels. The coir fibre composite skin providesmaximum core shear strength, 29 % higher than the aluminium-based panels, in cubic packing, while the flexural modulus isreduced by 45 %. An interlocking effect between the skin and the core is evidenced when coir fibre composites are used. Inaddition, the cubic cell packing increases the specific mechanical properties, even though with a higher density. The resultshighlight a promising association of green components and plastic bottle caps for secondary structural applications.
Marcelo Palinkas,Regina Maura Arantes Nassar,Mariangela Salles Pereira Nassar,Solange Aparecida Bataglion,César Bataglion,Cássio Edvard Sverzut,Takami Hirono Hotta,Simone Cecilio Hallak Regalo 셀메드 세포교정의약학회 2012 TANG Vol.2 No.1
The traumatic removal of the mandibular third molar may promote post chirurgic consequences such as orofacial pain and limited mandibular movements. The aim of this case report is to describe the use of an anterior bite plane and complementary therapies (low level laser therapy and acupuncture) to treat the muscular dysfunction and the painful symptoms. A 33 year-old male patient who had a severe malocclusion and signs and symptoms of temporomandibular dysfunction was submitted to an initial clinical examination: electromyography of the masticatory muscles and IRM of the temporomandibular joint. After treatments, the results showed reduced pain symptoms and an increase of the mandibular movements and adequated electromiographic activities. The authors concluded that the combination therapies may be used as an alternative treatment because it satisfied the functional requirements of the patient and provided an asymptomatic clinical condition.
Hybrid Polyester Composites Reinforced with Curauá Fibres and Nanoclays
Gilberto García del Pino,Antonio Claudio Kieling,Abderrezak Bezazi,Haithem Boumediri,Juliana Fontolan Rolim de Souza,Francisco Valenzuela Díaz,Jose Luis Valin Rivera,Jamile Dehaini,Tulio Hallak Panzer 한국섬유공학회 2020 Fibers and polymers Vol.21 No.2
This work investigates a hybrid polyester composite consisted of Curauá natural fibres and organophilic clay nanoparticles. A Taguchi method is used to identify the effects of fibre fraction (10, 20 and 30 wt%), alkaline treatmentconcentration (NaOH, 2.5, 5 and 10 wt%), treatment time (2, 4 and 8 h) and nanoparticle content (2.5, 5 and 10 wt%) on the mechanical behaviour of the hybrid composites under tension and three-point bending. X-ray, FTIR and microstructural analysis are performed to assess the treated and untreated fibre surfaces. The optimum combination of the process parameters for the tensile and flexural properties is: fibre content at 30 wt%, NaOH concentration at 5 wt%, treatment time at 8 h and nanoclay inclusions at 5 wt%. A mean tensile and flexural strength of 36.13 MPa and 32.55 MPa are obtained, whichrepresents percent increases of 39.22 % and 25.43 % compared to the polyester polymer in pristine condition.