Design and Experimental Implementation of a Multi-Cloak Paraxial Optical System

Electromagnetic cloaking has being continuously pursued using a large variety of approaches. In recent years, this effect has been observed using either complex devices based on the so-called Transformation Optics or simple systems based on conventional optics with proper characteristics. In the latter case, a simple arrangement of lenses working in the paraxial regime can provide broadband visible cloaking in a wide area. In this work, we analyzed and generalized this method by proposing a five-lens system producing at least three potential invisible regions with a large cloaked area (>90% of the visual field). In particular, we developed the mathematical formalism and show, both numerically and experimentally, the successful operation of the cloaking system with the naked eye.

Web Edukasi Almusan (Alat Musik Ansambel) Untuk Media Pembelajaran Siswa SMP PGRI Babelan

The art of music in learning arts and culture is conveyed by the medium of sound or tone, either the human voice or the sound of a musical instrument. One of the learning materials for the art of music is ensemble music. An ensemble is playing music together using several musical instruments and then playing a song with a simple arrangement. A good learning process is needed. Teachers and teachers of SMP PGRI Babelan experienced obstacles in the delivery of ensemble musical instrument material. Less effective learning media has an impact on students' understanding of the material. Therefore, an alternative solution for technological innovation is to create interactive website-based learning media to make learning easier. The almusan educational web is designed using images, videos, including musical instruments simulators that will make it easier for students and teachers to understand and understand compared to previous learning methods. With the existence of musical instruments, it virtually increases students' interest in learning ensemble musical instruments with the concept of theoretical and practical assessment. Keywords: Ensemble, Learning Media, Educational Website Abstrak Seni musik dalam pembelajaran seni budaya di sampaikan dengan media suara atau nada, baik suara manusia atau suara alat musik. Salah satu materi pembelajaran seni musik yaitu musik ansambel. Ansambel adalah bermain musik secara bersama – sama dengan menggunakan beberapa alat musik dan kemudian memainkan lagu dengan aransemen yang sederhana. Proses pembelajaran yang baik sangat di butuhkan. Guru maupun pengajar SMP PGRI Babelan mengalami kendala terhadap penyampaian materi alat musik ansambel. Media pembelajaran yang kurang efektif berdampak kurang nya siswa memahami materi. Maka dari itu solusi alternatif inovasi teknologi yaitu menciptakan media pembelajaran berbasis website yang interaktif supaya memudahkan dalam pembalajaran. Web edukasi almusan dirancang dengan menggunakan gambar, video disertakan alat musik simulator yang akan memudahkan bagi siswa dan guru untuk mengerti dan memahami dibandingankan dengan metode pembelajaran sebelumnya. Dengan adanya alat musik secara virtual meningkatkan minat siswa untuk memepelajari alat musik ansambel dengan konsep penilian teori dan praktek. Kata kunci: Ansambel, Media Pembelajaran, Web Edukasi

Design and Numerical Analysis of a Novel Rectangular PCF (R-PCF)-Based Biochemical Sensor (BCS) in the THz Regime

A novel PCF-based sensor has been presented in this paper to sense different chemicals and biocomponents. The proposed biochemical sensor (BCS) comprises a simple arrangement of rectangular holes. The competence of this BCS in detecting analytes is evaluated employing the full-vector finite element method (FEM). Performance metrics prove the competence of this BCS in sensing various analytes that have a refractive index in the range of 1.33–1.48. The proposed BCS shows ultralower values for both the bulk absorption and confinement loss. This BCS attains a maximum of about 95.82% relative sensitivity at 2.5 THz. Also, the dispersion for this sensor is only 0.12 ± 0.011 ps/THz/cm at the same point of interest. These results prove that the proposed BCS will play a key role in sensing toxic chemicals, illegal drugs, biocomponents, etc. Besides, the simple rectangle-based PCF structure ensures the feasibility of fabrication by practicing the existing fabrication strategies.

Music Therapy as Nursing Intervention in Improving Postpartum Mothers Comfort

Postpartum is a condition in which the reproductive organs return to normal which takes 6 weeks. The feeling of discomfort in postpartum mothers occurs because of the sensation of pain that is often complained of. One way to increase comfort for postpartum mothers is by providing non-pharmacological therapies, namely massage and listening to music. Music can provide impulses or stimuli that can override the pain signals. The literature review aims to describe the type of music that can increase the comfort of postpartum mothers. The method used is a literature review study. The database used from several journals and articles with a search process through Pubmed, Proquest, Springlink, Scopus, Google Scholar. The criteria for inclusion in this search were the year the articles were published, starting from 2010 to 2020. The type of classical music that has a medical connection is Mozart's music. Mozart music with a frequency of 40-60 Hz, tempo 60-80 bpm. Music therapy is given for approximately 20-30 minutes to produce a therapeutic effect with a period of twice a day for 2 days using headphones. Music used to increase comfort and reduce the anxiety that has a slow tempo, notes that are not too high or too low, has a low volume and is rhythmic with a simple arrangement, and a stable melody. The provision of music therapy, especially Mozart adagio classical music, affects reducing anxiety levels and reducing pain intensity so that it can provide a sense of comfort to postpartum mothers.

Numerical and Physical Simulation of Heat Transfer Enhancement Using Oval Dimple Vortex Generators—Review and Recommendations

Vortex generation and flow disruption in heat exchanger passages by means of surface modification is a widely used passive heat transfer augmentation technique. The present paper contains the results of numerical and experimental studies of the hydraulic resistance and heat transfer in the rectangle duct with oval-trench- and oval-arc-shaped dimples applied to the heat transfer surface. For the turbulent flow in the duct (Pr = 0.71, Red = 3200–9 × 104—for heat transfer determination and Red = 500–104—for the friction factor measurements), rational geometrical parameters of the oval-trench dimple were determined: relative elongation of dimple l/b = 5.57–6.78 and relative depth l/b = 5.57–6.78, while the value of the attack angle to the mean flow was fixed φ = (45–60)°. The comparison of the experimental and numerical modeling for the flow in the narrow duct over the surface with a single- and multi-row dimple arrangement has revealed a good agreement. It was found that the average heat transfer coefficient magnitudes in such ducts could be increased 1.5–2.5 times by means of single and multi-row dimple application on the heat transfer surface. The heat transfer augmentation for the surfaces with the oval-arched dimples was found to be 10% greater than the one for the oval-trench dimples. The corresponding friction factor augmentation was found to be 125–300% in comparison to the smooth surface duct. The obtained experimental data were used for the data generalization. Derived generalized equation allows for predicting the friction factor and heat transfer coefficient values for the flow over the single-row oval-trench simple arrangement. The maximal deviation of the experimental data from the proposed equations was found to be 20%. The application of the artificial neural networks for predicting the hydraulic resistance and heat transfer augmentation in such ducts was presented.

BIOMASSA E NUTRIENTES DE EUCALIPTO CULTIVADO EM SISTEMA AGROSSILVIPASTORIL

O objetivo foi quantificar a biomassa e o estoque de nutrientes do híbrido Eucalyptus grandis Hill ex Maiden x E. urophylla S. T. Blake (clone H13) aos 60 meses em sistema agrossilvipastoril. O estudo da biomassa residual (folhas e galhos finos), galhos grossos, madeira e casca e do estoque de nutrientes de eucalipto foi realizado na unidade de referência tecnológica de integração lavoura-pecuária-floresta em Nova Canaã do Norte, MT, cultivado em arranjo simples (2x20 m), duplo (3x2x20 m), triplo (3x2x20 m) e em monocultivo (4x3 m). Apenas a biomassa de galhos grossos, madeira e casca apresentaram diferenças significativas entre arranjos. Os nutrientes se acumularam em maior quantidade na madeira, e em ordem decrescente na casca, biomassa residual e nos galhos grossos. A biomassa residual, galhos grossos e casca correspondem a fração expressiva de nutrientes que permanece no sistema, e que contribuem para menor reposição na manutenção desses, após a colheita. O arranjo triplo apresentou maior acúmulo nutricional comparado ao arranjo simples e duplo. A eficiência nutricional é maior no arranjo de linha tripla devido a maior competição intraespecífica. O teor de nutrientes nas diferentes posições ao longo do fuste não apresentou variações nutricionais significativas para a madeira, diferentemente para a casca.Palavras-chave: sistema iLPF, nutrição florestal, compartimentos. BIOMASS AND NUTRIENTS OF EUCALYPTUS CULTIVATED IN AGROSSILVIPASTORAL SYSTEM ABSTRACT:The objective was to quantify the biomass and nutrient stock of the hybrid Eucalyptus grandis Hill ex Maiden x E. urophylla S. T. Blake, (clone H13) at 60 months in the agrosilvipastoril system. The study of the residual biomass (leaves and thin branches), thick branches, wood and bark and of the nutrient stock of eucalyptus was carried out in the technological unit of crop-livestock-forest integration in Nova Canaã do Norte, MT, cultivated in a simple arrangement (2x20 m), double (3x2x20 m), triple (3x2x20 m) and monoculture (4x3 m). Only the biomass of thick branches, wood and bark presented significant differences between arrangements. The nutrients accumulate in greater quantity in the wood, and in descending order in the bark, residual biomass and in the thick branches. Residual biomass, thick branches and bark correspond to the expressive fraction of nutrients that remain in the system, and which contribute to a lower replacement in the maintenance of these, after harvesting. The triple arrangement presented greater nutritional accumulation compared to the single and double arrangement. The nutritional efficiency is higher in the triple line arrangement due to greater intraspecific competition. The nutrient content in the different positions along the stem did not present significant nutritional variations for the wood, differently for the bark.Keywords: CLF integration system, forest nutrition, compartments.

Perceived Affordances in Older People with Dementia: Designing Intuitive Product Interfaces

The objective of this study was to examine the relationship between intuitive interactions and perceived affordances in product interfaces among older people with dementia. Experiments were conducted by examining the cooking time in the user interfaces of microwave ovens, and the participants involved 25 older people with mild dementia. The results showed that a simple arrangement of bottoms was more desirable for presenting visual information, but the usabilities of these interfaces were undesirable.

Design of haunches in structural steel joints

The paper presents research in design of haunches in structural steel joints. Experimental results of six speci­mens of haunches with and without flanges are presented. Three specimens are without flanges and three specimens are supported by additional flanges. Flanges differ in stiffness to observe the increase in haunch resistances and the effect on buckling shapes. The research finite element model (RFEA) is studied by material and geometrical nonlinear finite element analysis with imperfections under the actual stress conditions and validated on the measured experimental data. The validity is demonstrated on the comparison of load-deflection curves, failure modes, stress distributions and yield line patterns. The stability analysis of a joint with a haunch is related to the research into component based finite element models of complex joints. The input and the results of the research finite element model are summarised in a benchmark case of a haunch with a flange. A numerical study illustrates the effect of the flange stiffness on the joint’s resistance. The effect is demonstrated on a simple arrangement with triangular stiffeners and on a beam-to-column joint. The main goal of the research is to verify proposed design procedure for stiffeners in steel joints.

Wavelet decomposition of hydrodynamic and acoustic pressures in the near field of the jet

An experimental investigation of pressure fluctuations generated by a single-stream compressible jet is carried out in an anechoic wind tunnel. Measurements are performed using a linear array of microphones installed in the near region of the jet and a polar arc of microphones in the far field. The main focus of the paper is on the analysis of the pressure fluctuations in the near field. Three novel signal processing techniques are presented to provide the decomposition of the near-field pressure into hydrodynamic and acoustic components. The procedures are all based on the application of the wavelet transform to the measured pressure data and possess the distinctive property of requiring a very simple arrangement to obtain the desired results (one or two microphones at most). The hydrodynamic and acoustic pressures are characterized separately in terms of their spectral and statistical quantities and a direct link between the acoustic pressure extracted from the near field and the actual noise in the far field is established. The analysis of the separated pressure components sheds light on the nearly Gaussian nature/intermittent behaviour of the acoustic/hydrodynamic pressure. The higher sensitivity of the acoustic component to the Mach number variation has been highlighted as well as the different propagation velocities of the two pressure components. The achieved outcomes are validated through the application to the same data of existing separation procedures evidencing the advantages and limitations of the new methods.