Search

This study proposes a mathematical approach and numerical experiment for a simple solution of cardiac blood flow to the heart's blood vessels. A mathematical model of human blood flow through arterial branches was studied and calculated using the Navier-Stokes partial differential equation with finite element analysis (FEA) approach. Furthermore, FEA is applied to the steady flow of two-dimensional viscous liquids through different geometries. The validity of the computational method is determined by comparing numerical experiments with the results of the analysis of different functions. Numerical analysis showed that the highest blood flow velocity of 1.22 cm/s occurred in the center of the vessel which tends to be laminar and is influenced by a low viscosity factor of 0.0015 Pa.s. In addition, circulation throughout the blood vessels occurs due to high pressure in the heart and the pressure becomes lower when it returns from the blood vessels at the same parameters. Finally, when the viscosity is high, the extreme magnitudes of blood flow tend toward the vessel wall at approximately the same velocity and radius of the gradient.

Kegiatan pengabdian kepada masyarakat ini bertujuan untuk malakukan pendampingan pengembangan keterampilan pengembangan media BK interaktif pada kurikulum merdeka belajar bagi guru SMP di Kabupaten Lahat. Pelatihan pengembangan pengembangan media BK pada kurikulum merdeka belajar bagi guru SMP di Kabupaten Lahat ini dilakukan dengan pendampingan teknis dan workshop. Kegiatan Pendampingan ini diawali dengan memberikan guru SMP di Kabupaten Lahat ini pengetahuan mengenai konsep-konsep media BK. Sasaran dalam kegiatan pengabdian ini adalah 25 guru SMP di Kabupaten Lahat. Hasil evaluasi yang dilakukan diketahui skor N Gain sebesar 0,74 artinya peningkatan pengetahuan guru mencapai kategori tinggi. Peningkatan pengetahuan juga didukung oleh media yang telah dihasilkan sendiri melalui pendampingan yang dilakukan untuk membuat media BK interaktif melalui aplikasi canva. Produk yang dihasilkan oleh guru SMP di Kabupaten Lahat dengan kategori sangat baik dengan persentase sebesar 91,2%. Hal tersebut menunjukkan bahwa guru SMP di Kabupaten Lahat dapat memahami dan mengaplikasikan pembuatan media BK pada kurikulum merdeka belajar.

Understanding by Design (UBD) is a recommended learning model in the independent learning curriculum. The issue in this study is that Indonesia is a country of a million disasters so it is important to have broad insights related to disasters and their mitigation. The reality is that students still lack insight into disasters and their mitigation. The purpose of the study was to improve the disaster literacy of students using the UBD learning model with pop-up book media. Quantitative methods were used in the study. The population in this study was SD N Experimental Padang, West Sumatra which had a sample of 42 students divided into a control class and an experimental class. The result of the application of the UBD model is the result of statistical analysis with a t-test showing that the value of the t coefficient is 19,252 with a df of 20 and a p-value of 0.00. The coefficient is p-value

We introduce new general spaces of subharmonic functions in the unit disk and prove some new parametric representation results for them expanding some previously known assertions. [ABSTRACT FROM AUTHOR]

Under certain integral condition we present new sharp decomposition theorems for mul- tifunctional Herz spaces in the unit ball and pseudoconvex domains expanding the known results from the unit ball. This expands completely the well-known atomic decomposition theorem for one functional Bergman space in the unit ball. [ABSTRACT FROM AUTHOR]

Abstrak. Penelitian ini melaporkan sintesis alkaloid dari biji bintaro (Cerbera manghas). Serbuk biji bintaro yang dihasilkan dari sintesis ekstrak biji bintaro (Cerbera manghas) dikarakterisasi menggunakan Spektroskopi Fourier Transform Infrared (FTIR) dan uji fitokimia. Spektrum FTIR hasil pengujian dari sintesis ekstrak biji bintaro menunjukkan puncak kuat pada 3239, 3338, dan 3293 cm-1 dan sudah menunjukkan hasil alkaloid. Hasil pengujian fitokimia juga telah menunjukkan terdapat senyawa alkaloid. Sintesis alkaloid yang telah diperoleh dijadikan zat aditif pada pembuatan cat. Pada penelitian ini telah berhasil dibuat cat yang berbahan dasar cat komersil untuk aplikasi kayu dengan penambahan zat aditif yaitu serbuk biji bintaro (Cerbera manghas). Pembuatan cat diperoleh dengan menggabungkan cat komersil dengan serbuk biji bintaro dengan perbandingan fraksi massa yaitu 100:0, 95:5, 90:10, 85:15. Cat pada penelitian ini diuji karakterisasinya antara lain adalah uji daya rekat, uji densitas, dan uji viskositas. Hasil penelitian menunjukkan bahwa uji daya rekat terbaik dengan fraksi massa cat: serbuk biji bintaro sebanyak 95:5 masuk dalam klasifikasi 5B dengan area terkelupas sebanyak 0,6%, pada uji densitas dan viskositas nilai yang tertinggi terdapat pada fraksi massa 100:0, nilai viskositas dan densitas masih memenuhi kategori cat kayu yaitu standar SNI 8406.6:2017 densitas cat minimal 1,2 g/ dan standar viskositas cat minimal 11,5 poise. Abstract. This study reports on the synthesis of alkaloids from the seeds of bintaro (Cerbera mangos). Bintaro seed powder produced from the synthesis of bintaro seed extract (Cerbera mangos) was characterized using Fourier Transfor Infrared Spectroscopy (FTIR) and phytochemical tests. The FTIR spectrum of the test results from the synthesis of bintaro seed extract showed strong peaks at 3239, 3338, and 3293 cm-1and already showed alkaloid results. Phytochemical test results have also shown that there are alkaloid compounds. The synthesis of alkaloids that have been obtained is used as an additive in the manufacture of paint. In this study, commercial paint-based paints for wood applications have been successfully made with the addition of additives, namely bintaro seed powder (Cerbera mangos). The manufacture of paint is obtained by combining commercial paint with bintaro seed powder with a mass fraction ratio of 100:0, 95:5, 90:10, 85:15. The paint in this study was tested for its characterization, including the adhesion test, density test, and viscosity test. The results showed that the best adhesion test with the mass fraction of paint: bintaro seed powder as much as 95:5 included in the 5B classification with a peeling area of 0.6%, in the density and viscosity test the highest value was found in the mass fraction of 100:0, the value the viscosity and density still meet the wood paint category, namely the standard SNI 8406.6:2017 paint density of at least 1.2 g/m3 and the minimum paint viscosity standard of 11.5 poise.

Abstrak. Penelitian ini bertujuan untuk membuat genteng polimer menggunakan pengisi serat sisal, pasir dan perekat limbah botol plastik polyethylene terephtalate (PET) dan aspal. Penelitian ini dilakukan untuk mengetahui karakteristik sifat fisis dan sifat mekanis genteng polimer dengan melihat pengaruh penggunaan jumlah pengisi yaitu pasir dan serat sisal. Perbandingan massa bahan yang digunakan adalah 10% aspal: 55% PET untuk variabel tetap, sedangkan variabel bebas untuk perbandingan persentase pasir dan serat sisal yaitu GP1 (0:87,5), GP2 (21,87:65,63), GP3 (43,75:43,75), GP4 (65,63:21,87), GP5 (0:87,5). Proses pembuatan dan pencetakan genteng menggunakan metode hotpress dengan tekanan 60 bar. Pengujian yang dilakukan meliputi sifat fisis yaitu kerapatan, dan daya serap air menggunakan standar ASTM C830-00, sedangkan sifat mekanis meliputi uji kuat lentur dan uji kuat tarik dengan menggunakan standar ASTM D-790. Hasil pengujian menunjukkan bahwa genteng dengan penggunaan 100% pasir menghasilkan genteng yang mudah rapuh atau getas, hal ini dikarenakan pasir memiliki ukuran butir yang lebih besar dibandingkan dengan penggunaan pengisi 100% serat sisal, namun apabila penggunaan serat sisal digabungkan dengan penggunaan pasir dengan persentase komposisi 21,87% pasir : 65,63% serat sisal maka akan menghasilkan genteng polimer yang lebih baik lagi dibandingkan genteng dengan penggunaan 100% serat sisal atau pasir. Hasil pengujian dapat disimpulkan bahwa genteng polimer yang dihasilkan telah memenuhi standar SNI baik uji fisis maupun uji mekanis kecuali pada uji tarik. Abstract. This study aimed to prepare polymer rooftile using residual fiber fillers, sand and adhesives of polyethylene terephtalate (PET) plastic bottle waste and asphalt. This study was conducted to determine the characteristics of physical properties and mechanical properties of polymeric tiles by looking at the influence of the use of the amount of filler, namely sand and sisal fibers. The mass ratio of the materials used was 10% asphalt: 55% PET for fixed variables, while the free variables for the ratio of percentage of sand and sisal fiber were GP1 (0:87,5), GP2 (21,87:65,63), GP3 (43,75:43,75), GP4 (65,63:21,87), GP5 (0:87,5). The process of making and printing tiles used the hot-press method with a pressure of 60 bar. The characterizations carried out include physical properties, density, and water absorption using the ASTM C830-00 standard, while mechanical properties include bending strength tests and tensile strength tests using the ASTM D-790 standard. The test results showed that rooftile with the use of 100% sand produce tiles that are easily fragile or brittle, this was because sand has a larger grain size compared to the use of filler 100% sisal fiber, but if the use of sisal fiber was combined with the use of sand with a percentage composition of 21.87% sand: 65.63% sisal fiber it would produce even better polymer rooftile than rooftile with the use of 100% sisal fiber or sand. The test results ccould be concluded that the polymeric tiles prepared herein have met the ASTM standards, both in terms of the physical and mechanical properties, except the tensile property.

Aquaculture produces nearly half of the seafood consumed by the ever-growing world population. There have been attempts to adopt novel technologies into the industry to increase profitability, particularly the Internet of Things (IoT). In aquaculture, it is therefore important to evaluate and address the challenges related to IoT. The purpose of this review is to categorize the challenges associated with implementing IoT systems in aquaculture according to the literature. This work reviewed prototyped IoT systems reported in the literature in the last five years. Moreover, some potential solutions to the reported challenges were discussed with the help of literature that can be used by researchers in the future. Among IoT systems used in aquaculture, some challenges are common, while others are specific to particular species or farms. Due to direct contact with water, maintenance of sensor probes is a common challenge. The literature addressed this problem through different designs that led to self-cleaning mechanisms. There were three categories of specific challenges: infrastructure-related, data-related, and perception-related. Infrastructural challenges primarily relate to electricity availability and internet connectivity. For electricity, energy harvesting technologies are suggested, and for internet connectivity, satellite internet or offline systems are suggested. The data related category covers challenges related to data loss due to device or network errors. Studies have shown that incorporating soft methods can help resolve most of these issues. Perception-related challenges examine barriers that prevent aquaculture farmers from implementing IoT systems. As one potential remedy for this barrier, literature suggests policy makers intervene in promoting the benefits of IoT systems and providing incentives.

A metamaterial is any material engineered with a property not discovered in naturally occurring materials. Its existence is important in the development and application of modern technology in this century. Furthermore, Its characteristics such as high sensitivity and gain can be potentially applied in antenna technology. In this research, the metamaterial implementation was used to improve low-profile microstrip antennas as ultra-wideband (UWB) applications. The proposed metamaterial consists of variations of one to four hexagonal shape split ring resonator (SRR-H) elements. This study was carried out through simulation and experiments which were operated in the frequency range 0.05–9 GHz. Based on the results, the proposed antenna with the variation of the SRR-H elements provides increased performance than the without SRR-H. The highest double-negative (DNG) metamaterial characteristic of the SRR-H four-element structure provides the highest antenna performance compared to others. The given working frequency occurs at 5.98 GHz with an increase in bandwidth of 47.49% from without SRR-H. The antenna metamaterial structure also responds by providing an ultimate gain radiation pattern of 5.97 dBi at a 45-degree angle in the Quadrant II region. Thus, the performance of the proposed antenna shows the potential for use in UWB technology.

We provide some new estimates and new sharp assertions for Trace operator related with embeddings in multifunctional holomorphic Herz and Bergman spaces. We note that one integral condition in Herz spaces on kernel in bounded pseudoconvex domains in Cn can be removed in the unit ball case. Some results are new even in case of holomorphic spaces of one functions. Related new sharp results with same proofs will be provided also in unbounded tubular domains over symmetric cones. [ABSTRACT FROM AUTHOR]

In this note we define new Poisson-type integral in the unit ball and unit polyball and we extend a known classical maximal theorem related with it. Related results for such type integrals will be given. [ABSTRACT FROM AUTHOR]