bluuebunny/crossref_metadata_2025 huggingface dataset:
Pengembangan Alat Peraga Energi Terbarukan Berbasis Solar Cell pada Pembelajaran IPA
Authors: Delima Ega Marita , Afrizal Mayub  , Euis Nursa’adah
Published: June 2023

Penelitian ini bertujuan mengembangkan dan menghasilkan alat peraga energi terbarukan berbasis solar cell pada pembelajaran IPA yang valid. Metode yang digunakan dalam penelitian ini adalah research and development (R&D) dengan model ADDIE. Namun, penelitian ini dibatasai hingga tahap development untuk menentukan validitas isi dari alat peraga yang dikembangkan. Subjek penelitian ini adalah siswa kelas IX dan guru IPA SMPN 4 Bengkulu Tengah. Teknik pengumpulan data berupa angket siswa, angket validasi ahli dan panduan wawancara guru. Teknik analisa data pada penelitian ini menggunakan teknik persentase dan rumus Aiken’s V untuk mengukur validitas alat peraga yang dikembangkan. Hasil penelitian menunjukkan bahwa alat peraga yang dikembangkan valid (layak) dengan nilai rata-rata indeks Aiken sebesar 0,98 yang telah melampaui standar batas minimal Aiken’ V untuk penelitian ini yaitu 0,92.
Implementation of Problem Based Learning By Using Authentic Assessment to Improve Students’ Activity and The Ability of The Students to Solve Problem
Authors: Muda Sakti Raja Sihite  , Lena Rosdiana Pangaribuan
Published: June 2023

The learning process of Mathematic in a conventional way took place in classroom was dominated by a teacher and gave less opportunity for the students to be more active in the learning process. Problem Based Learning by using Authentic Assessment is one of the alternatives to improve students’ activity in solving problems. This is a classroom action research. This research is focused on the improvement of students in problem solving; and improve the students’ activity. The instrument in this research consists of test in solving problem in Equation and Quadratic Function. Data Processing is done to find out the improvement of problem solving ability, students’ activity and teachers’ ability in managing teaching learning process. The result of the research shows: (1) The application of problem based learning by using authentic assessment improves the problem solving ability of mathematics. On 1st cycle, it is found 62.5% from the students has the ability of problem solving in the average of moderate. On 2nd cycle 85% of the students gets the average of moderate. (2) It is concluded that the students’ problem solving ability and the level of students’ activity are improve.
Efektivitas Modul Larutan Elektrolit dan Non Elektrolit Berbasis Inkuiri Terbimbing Terintegrasi Al-Qur’an terhadap Hasil Belajar di Madrasah Aliyah
Authors: Yunita Lestari A  , Iryani Iryani
Published: June 2023

Penelitian ini merupakan penelitian lanjutan dari penelitian pengembangan modul larutan elektrolit dan non elektrolit berbasis inkuiri terbimbing terintegrasi Al-Qur’an yang telah diuji validitas dan pratikalitasnya, tetapi belum dilakukan uji efektivitas. Penelitian bertujuan untuk mengungkapkan efektivitas penggunaan modul larutan elektrolit dan non elektrolit berbasis inkuiri terbimbing terintegrasi Al-Qur’an terhadap hasil belajar di Madrasah Aliyah. Jenis penelitian yang digunakan adalah quasi eksperimen dengan desain nonequivalent control group desain. Populasi yang digunakan adalah peserta didik kelas X MIPA MAN 2 Kota Padang, sampel ditentukan dengan teknik purposive sampling, sebagai sampel kelas X MIPA 6 dan 7. Instrumen penelitian yang digunakan adalah tes hasil belajar. Teknik analisa data yang digunakan adalah uji N-Gain, uji normalitas, uji homogenitas, dan uji t. Berdasarkan analisis data, diperoleh hasil belajar peserta didik kelas eksperimen lebih tinggi secara signifikan dibandingkan kelas kontrol. Hasil nilai N-gain kelas eksperimen diperoleh 0.84 dengan kategori tinggi sedangkan nilai N-gain kelas kontrol adalah 0,51 dengan kategori sedang. Hasil uji t pada taraf nyata 0,05 yaitu Thitung (9,3) > Ttabel (1,99) menunjukkan hipotesis diterima. Dapat disimpulkan bahwa penggunaan modul larutan elektrolit dan non elektrolit berbasis inkuiri terbimbing terintegrasi Al-Qur’an efektif meningkatkan hasil belajar di Madrasah Aliyah.
Corioamnionitis más tuberculosis peritoneal en paciente embarazada de 21 semanas de gestación. Reporte de caso
Authors: Hidalgo Eguiguren Andrés Felipe , Rodríguez López Anthony Alexander , Pintado Paltin Christian Andrés , Alvarez Saltos Miguel David , Sigcho Samaniego Alicia Deyaneira
Published: June 2023

La corioamnionitis es la inflamación aguda del amnios y el corion, es un marcador de infección intraamniótica, aunque puede ocurrir en ausencia de infección detectable. La corioamnionitis histológica, identificada a través del examen patológico de la placenta, puede estar presente en ausencia de corioamnionitis clínica, que se diagnostica principalmente por fiebre materna. La tuberculosis es una enfermedad infecciosa causada por la bacteria Mycobacterium tuberculosis, que constituye un problema de salud pública en el mundo. La tuberculosis peritoneal (TBP) es una patología de baja incidencia que representa el 0.34% de los casos de tuberculosis. Su presentación clínica suele ser inespecífica e insidiosa.

Se Reporta un caso de un paciente gestante de 21 semanas por fecha de ultima menstruación que acude por presentar alza térmica mayores a 38 grados centígrados, acompañada de dolor abdominal tipo contracciones uterinas 1 de 10 que duran aproximadamente 5 segundos. Paciente es ingresada al área de ginecología y obstetricia.
Aprovechamiento del Endocarpio del Plátano Verde (Musa Paradisiaca) parala Obtención de papel Ecologico.
Authors: Taco Rivera Jimena Carolina , Guisella Elizabeth Pincay Aguirre , Quiñonez Alvarado María del Pilar , Arellano Huerta Janena Alexandra , Chicaiza Morales Wilson Vladimir
Published: June 2023

El propósito es obtener papel ecológico a partir del endocarpio del plátano verde (Musa paradisiaca) como una alternativa para reducir el impacto ambiental. Se aplicó un diseño experimental A x B (3x3) donde el factor A representó el porcentaje de celulosa al 10%, 20% y 30% y el factor B la celulosa de papel reciclable al 10%, 20% y 30%, comprendiendo 9 tratamientos con 3 repeticiones y un total de 27 unidades experimentales. Como materia prima se utilizó el endocarpio de  plátano verde seleccionada la cuál presentó una  humedad de  86,50%, densidad de 0,93 ????/ ????????3 y un porcentaje de celulosa de 24,25. Para elaborar la pulpa se utilizó el método de pulpeo semi químico, esta pulpa se dispuso en 27 bastidores y se secó al ambiente por 2 días y como resultado se obtuvo 27 láminas de 12 cm por 4 cm. Se analizó experimentalmente las propiedades físicas de las 27 muestras de papel obtenido, se midió gramaje, humedad y espesor y se comparó con las normas TAPPI T respectivas (410,411 y 412). Estos datos se evaluaron estadísticamente mediante una prueba de Tukey con 95% de confianza en InfoStat. De acuerdo a los resultados presentados en esta investigación se determina que el  endocarpio de verde empleado no es apta para producir papel de calidad de acuerdo a las normativas internacionales
Generación de señales ECG con funciones de fourier en un microcontrolador de arquitectura ARM 32
Authors: Tenorio Erik David , Guevara López Pedro , Sánchez García Juan C. , Cedillo Hernández Manuel , Hernández González Leobardo
Published: June 2023

Los eventos bioeléctricos se manifiestan como diferencias de potencial entre dos puntos o señales eléctricas localizadas en diferentes lugares de un organismo viviente, ya sea dentro o en la superficie de este, el comportamiento de estos refleja la salud de un ser humano y para determinarlos se verifican los signos vitales. Para obtener un diagnóstico adecuado, entre algunas señales vitales, se encuentra el electrocardiograma (ECG). Por ello, es necesario conocer y reproducir esta señal para diagnosticar algún padecimiento o bien asegurarse que el equipo que adquiere la señal funciona adecuadamente. Esto motivó el desarrollo del presente trabajo, que presenta la generación artificial de una señal ECG a través de la suma de armónicos de Fourier en un microcontrolador de arquitectura ARM ST STM32f407VGT de 32 bits, debido a sus características de diseño y su aplicación a sistemas embebidos, así como las prestaciones en cuestión de periféricos disponibles para reproducir la señal. Como la señal Electrocardiograma ECG es una señal periódica, con una frecuencia fundamental determinada por la frecuencia de ritmo cardiaco, satisface las condiciones de Dirichlet, que plantea que para que la serie de Fourier exista, sus coeficientes son finitos. La contribución principal de este trabajo fue generar señales EGC de manera artificial, que pueda ser útil para entrenamiento médico o calibración de instrumental de medición.
Sentido Axiológico de la Didáctica: Reinventando la Práctica Docente
Authors: Carriel Villegas Josue Geovanny , Noroña Ramírez Eugenia Magdalena , Mogrovejo Gomezcoello Lilia Cristina , Trávez Vizcaino Segunda Lilia
Published: June 2023

La educación es un sinfín de posibilidades sociales, personales, culturales y epistémicas, concurridas en el sentido del sujeto en formación, quien, desde su esencia, le asigna significado al arbóreo activo de la enseñanza. Por ello, todo docente ha de valerse de una matriz simbiótica entre el niño, niña y su contexto inmediato, atendiéndolo desde su rizoma familiar, histórico y conductual; esta determinación, fecunda en la distribución asertiva de la pedagogía, integrando al escolar en el foco de direccionalidad educativa, donde el aprendizaje, nutre la multiexistencialidad mediadora en el desarrollo del conocimiento; sin embargo, dicha conducta, no puede estar desprovista de la valoración humana, pues, su pragmasis, consolida los cimientos de una moralidad sentida en el cómo y para qué se forma. Características que permiten demarcar como propósito, describir mediante un nodo documental el sentido axiológico de la didáctica basado en una reinvención de la práctica docente; esta noesis, permite una reflexión profunda en la codificación activa del docente en el contexto de la educación general básica de Ecuador, cuya finalidad es, el logro de una disposición permeable e interactiva de la sociabilidad cognitiva, concatenada en la divergencia de las necesidades e intereses escolares; imbricación circundante de voluntad mediadora necesaria en la actitud consciente de las maestras y maestros del futuro.
La eficacia de la tutoría entre iguales para mejorar la pronunciación y fluidez de los estudiantes de inglés turístico
Authors: Galullo Cristina
Published: June 2023

El presente estudio tiene como objetivo explorar la eficacia de un programa de asesoría en inglés entre pares para mejorar la pronunciación y la fluidez, destrezas del habla inglesa de una importancia crucial en el mercado laboral local dominado por la industria del turismo.

Los participantes son diez estudiantes de la Carrera Técnica en Servicios Turísticos Especializados que asistieron a sesiones de asesoría impartidas por una estudiante del último semestre de la licenciatura en Lenguas Modernas con orientación en docencia, quién cumplía con su práctica de servicio social.

Los datos provienen de diferentes fuentes (archivos de audio, observación, cuestionario, reflexión escrita) e involucran a todos los participantes para triangulación.

Los resultados de la investigación muestran que los estudiantes de turismo mejoraron sus habilidades orales y se expresaron positivamente sobre el programa.  Sus respuestas al cuestionario de satisfacción denotan que la instrucción de la asesora fue eficaz y también impulsó los asesorados a tomar conciencia de su proceso de aprendizaje, a sentirse menos ansiosos al momento de hablar. Esa percepción se manifiesta también en la reflexión escrita que la asesora redactó al final del proyecto, lo que confirma las suposiciones hechas por la docente-investigadora al revisar la literatura.
Efectos económicos sociales por la disolución y liquidación de las compañías de la provincia de Loja- Ecuador
Authors: Girón Calva Hipatia Carolina , Zhapa Amay Elvia Maricela , Luzuriaga Granda Ignacia de Jesús , Riofrío Leiva Luis Antonio , Lopez Cabrera Laura Thalia
Published: June 2023

Para determinar los efectos económico-sociales por procesos de disolución y liquidación de compañías en la provincia de Loja, se realizó un análisis comparativo y descriptivo, considerando la base de datos de la Superintendencia de Compañías, Valores y Seguros; Servicios de Rentas Internas, Ministerio del Trabajo y el Instituto Ecuatoriano de Seguridad Social. En la provincia de Loja durante el periodo 2015-2020, existieron 90 compañías de los diferentes sectores económicos que entraron en proceso de disolución y liquidación. En el 2015 el Estado ecuatoriano recibió un total de $ 205.111,55; en el año 2020 la contribución fue de $ 3.831,14 por Impuesto a la Renta. La información social se obtuvo del Ministerio de Trabajo, donde constan 268 contratos realizados por las compañías en el periodo 2015-2020; mientras que, de acuerdo con información del Instituto Ecuatoriano de Seguridad Social, se encuentra registrados 305 avisos de salida en el periodo, relacionados con la población económicamente activa para determinar el incremento de la tasa de desempleo. El año 2016 fue el de mayor incidencia, con 137 avisos de salida que representa un 0,048% de incremento de la tasa de desempleo frente a la PEA, por efecto de la disolución y liquidación de las compañías.
Upaya Penanganan dan Pencegahan Kekurangan Energi Kronis (KEK) Melalui Edukasi Gizi Pada Wanita Masa Prakonsepsi
Authors: Sudirman Jumrah , Marwang Sumarni , Passe Rosita
Published: June 2023

Status gizi masa prakonsepsi merupakan salah satu faktor yang memengaruhi kondisi kehamilan dan kesejahteraan bayi, apabila pencegahan dilakukan pada saat sebelum hamil maka efeknya akan lebih baik. Skrining prakonsepsi berguna untuk mengurangi resiko dan mempromosikan gaya hidup sehat untuk mempersiapkan kehamilan sehat. Kegiatan pengabdian masyarakat ini dilaksanakan di Puskesmas Bontomarannu pada tanggal 22 Desember 2022. Tujuan kegiatan adalah meningkatkan pengetahuan Wanita prakonsepsi untuk upaya penanganan dan pencegahan kekurangan energi kronik (KEK). Kegiatan ini dihadiri oleh 11 peserta. Pada pelaksanaan kegiatan dilakukan pretes dan postes kepada peserta menggunakan kuisioner untuk menilai peningkatan pengetahuan setelah edukasi. Hasil yang didapatkan 100% peserta mengalami peningkatan pengetahuan pada saat evaluasi dilakukan. Hal ini menunjukkan kegiatan edukasi ini efektif dilakukan untuk upaya penanganan dan pencegahan kekurangan energi kronik (KEK).
DUKUNGAN SUAMI TERHADAP PERILAKU IBU DALAM PENCEGAHAN STUNTING PADA BALITA
Authors: Juwita Septiana , Ediyono Suryo
Published: June 2023

Stunting menjadi masalah gizi pada balita yang harus mendapatkan penanganan serius. Apabila stunting tidak segera ditangani, maka konskuensi jangka panjang akan memperburuk keadaan balita baik secara fisik maupun secara mental sehingga akan menjadi beban keluarga. Penanganan stunting memerlukan kerja sama dengan berbagai pihak dalam upaya menyadarkan masyarakat akan pentingnya gizi balita. Tujuan penelitian ini untuk mengetahui hubungan antara dukungan suami terhadap perilaku ibu dalam pencegahan stunting pada balita. Subjek dan Metode: desain penelitian kuantitatif menggunakan pendekatan cross sectional. Sampel yang diambil sebanyak 152 responden dengan pengambilan menggunakan purposive sampling. Instrumen yang digunakan adalah kuesioner. Analisis data menggunakan uji Chi square. Hasil penelitian menunjukkan suami yang selalu memberikan dukungan kepada istri sebesar 46,7% dan ibu selalu melakukan pencegahan stunting pada balitanya sebesar 51,3% sehingga terdapat hubungan hubungan antara dukungan suami terhadap perilaku ibu dalam pencegahan stunting pada balita dengan p-value 0,000. Kesimpulan penelitian adalah dukungan suami sangat diperlukan ibu dalam melakukan pencegahan stunting pada anak balita.
 
Kata kunci: dukungan suami, perlaku ibu, stunting, balita
 
Stunting is a nutritional problem in toddlers who must get serious treatment. If stunting is not treated immediately, long-term consequences will worsen condition of the toddler both physically and mentally so that it will become a burden on the family. Handling stunting requires cooperation with various parties in an effort to make the community aware of the importance of nutrition for toddlers. The aim of the study to determine the relationship between husband support for maternal behavior in stunting prevention in toddlers. Subjects and Methods : quantitative research design used a cross sectional approach. The sample taken was 152 respondents by taking using purposive sampling. The instrument used is a questionnaire. Data analysis using chi square test. Results: Husbands who always provide support to wives by 46.7%, and mothers always prevent stunting in their toddlers by 51.3%. There is a relationship between husband support for maternal behavior in stunting prevention in toddlers with a p value of 0.000. Conclusio: husband support is needed by mothers in preventing stunting in children under five.
 
Keywords: husband’s support, mother's behavior, stunting, toddlers
HUBUNGAN HARGA DIRI DENGAN KUALITAS HIDUP PASIEN GAGAL GINJAL KRONIK YANG MENJALANI HEMODIALISA DI RENAL UNIT RUMAH SAKIT Dr. OEN KANDANGSAPI SOLO
Authors: Yulianti Tunjung Sri , Diyono Diyono , Margiyani Unik
Published: June 2023

Gagal ginjal kronis merupakan salah satu penyakit yang mengancam kelangsungan hidup. Terapi definitif untuk penyakit gagal ginjal belum ada selain dengan terapi pengganti ginjal, baik dengan dialisis maupun cangkok ginjal. Hemodialisa memberikan pengaruh terhadap keadaan fisik pasien seperti pruritus atau keluhan fisik yang lain. Disamping itu muncul permasalahan psikologis yaitu cemas, stres, perasaan kehilangan, ketakutan, hilangnya kepercayaan diri atau harga diri, perubahan identitas bahkan depresi. Dialisis dilakukan sepanjang hidup untuk mengatasi gejala tetapi tidak menyembuhkan gagal ginjal. Oleh karena itu diperlukan perawatan paliatif dan dukungan orang terdekat untuk mengurangi penderitaan dan memperbaiki kualitas hidup pasien. Tujuan penelitian  ini adalah menganalisis hubungan harga diri dengan kualitas hidup pasien gagal ginjal kronik yang menjalani hemodialisa di Renal Unit  RUMAH SAKIT Dr. OEN KANDANGSAPI SOLO. Subyek penelitian ini adalah pasien gagal ginjal kronik yang menjalani hemodialisa di Renal Unit  RUMAH SAKIT Dr. OEN KANDANGSAPI SOLO. Metode penelitian adalah analitik dengan desain korelasi. Hasil penelitian menunjukkan terdapat hubungan yang signifikan antara harga diri dengan kualitas hidup, nilai p= 0.000. Kesimpulan penelitian adalah harga diri secara signifikan berhubungan dengan kualitas hidup pasien gagal ginjal kronik yang menjalani hemodialisa.
Kata kunci: harga diri, kualitas hidup
Chronic kidney failure is a disease that threatens survival. There is no definitive therapy for kidney failure apart from kidney replacement therapy, either with dialysis or a kidney transplant. Hemodialysis affects the patient's physical condition such as pruritus or other physical complaints. Besides that, psychological problems arise, namely anxiety, stress, feelings of loss, fear, loss of self-confidence or self-esteem, changes in identity and even depression. Dialysis is carried out throughout life to manage symptoms but does not cure kidney failure. Therefore, palliative care and support from the closest people is needed to reduce suffering and improve the patient's quality of life. This research was aims to analyze the relationship between self-esteem and quality of life in chronic kidney failure patients undergoing hemodialysis at the Renal Unit of Dr. OEN KANDANGSAPI SOLO Hospital. The method of this research was analytic research with correlation design. The subjects of this study were chronic kidney failure patients undergoing hemodialysis at the Renal Unit of Dr. OEN KANDANGSAPI SOLO Hospital. The Results showed that there is a significant relationship between self-esteem and quality of life (p= 0.000). The conclusion was self-esteem is significantly related to the quality of life of chronic kidney failure patients undergoing hemodialysis,
Keywords: self esteem, quality of life
Efektivitas Pelatihan Power Point Untuk Meningkatkan Keterampilan Anak Didik Panti Asuhan Sakinah
Authors: Setiawan Santoso , Kadafi Abdul Rahman , Tuslaela  , Purnamasari Indah
Published: June 2023

Power Point training is a training designed to assist participants in mastering the skills in using presentation software, namely Microsoft Power Point. In this training, participants will learn how to create interesting and effective presentations using Power Point. The material taught in Power Point training includes how to create attractive presentation slides using images, text, graphics, tables, and other media. In addition, participants will also be taught how to present information clearly and easily understood by the audience. This training will also discuss good slide layout, the use of animation and transitions, and effective presentation techniques. Participants will learn how to create engaging and memorable presentations using these techniques. By attending Power Point training, participants will be able to improve their presentation skills and create more interesting and effective presentations. Participants will get tips and tricks from the instructor in using Power Point.

 

Keywords: Training, Power Point, Presentation
Performance of an Interleaved Spread Spectrum OFDM System over Multipath Fading Channels
Authors: Tu Pingzhou
Published: June 2023

In this paper we propose an interleaved spread spectrum orthogonal frequency division multiplexing (ISS-OFDM) system and investigate its performance over frequency selective multipath fading channels. The purpose is to exploit frequency diversity capability, develop an e±cient spectrum spreading algorithm and improve the system performance over frequency selective multipath fading channels. At transmitter, a spectrum spread ISS-OFDM signal is generated by employing OFDM modulation and interleaving techniques. At the receiver, two solutions including serial demodulation and parallel demodulation for diversity combing are proposed, in which the received signals are combined by using a maximum ratio combining (MRC) technique. The simulation indicates that higher frequency diversity is achieved, and the Bit Error Rate (BER) and Peak-to-Average Power Ratio (PAR) performances of the proposed ISS-OFDM system over frequency selective multipath fading channels are improved signi¯cantly as compared with the conventional OFDM systems. Another unique characteristic is that the spectrum spreading factor and diversity order provided by the system are reconfigurable to achieve cognitive communications.
A Distributed Topology Adjustment Algorithm for Wireless Networks with Mobile Base Stations
Authors: Wipusitwarakun Komwut
Published: June 2023

Improper static network topology can reduce the capacity of wide area wireless access networks in which the distribution of subscribers' population often changes. This paper focuses on "fully wireless cellular networks" with mobile base stations, where the network topology can be dynamic due to the mobility of the base stations. In such environment, network topology can be properly controlled by the adjustment of mobile base stations' positions. A novel distributed topology adjustment algorithm is proposed in this paper. The proposed algorithm tracks subscriber's population by moving mobile base stations toward the center of their nearby groups of subscribers. At the same time, mobile base stations are also drawn outward their neighboring base stations in order to solve the "oversupply base station" problem. The balance between 2 movement forces determines the proper position of mobile base stations. The performance evaluation of the proposed algorithm shows that the proposed algorithm performs well, even in rapidly changes of subscribers' population or in the presence of failure of base stations.
Robust Stability Condition for a Class of Time-Delay Plants with Uncertainty
Authors: Yamada Kou , Hagiwara Takaaki , Yamamoto Hideharu
Published: June 2023

In this paper, we consider the robust stability condition for single-input/single-output time-delay plants with new class of uncertainties. First of all, we de¯ne a class of uncertainties to be considered. The necessary and sufficient robust stability condition for time-delay plants with such class of uncertainties is presented. The relation between the time-delay plant and the nominal time-delay plant to satisfy the robust stability condition is clarified. By using this relation, we will show the necessary and sufficient robust stability condition for the time-delay plant with varying number of right half plane poles.
Methods to Determine Overhead Ground Wire Sizes in Distribution Systems
Authors: Thanasaksiri Thanaphong
Published: June 2023

This paper presents an approach to analyze the overhead ground wire (OHGW) sizes in distribution system focus on the i2t of line to ground fault current. For line to ground fault, the fault current and duration time when fault take place as well as the relay operating time have been concerned. The Line Type 1, OHGW not connected to the neutral of substation power transformer, give the short circuit current magnitude which is less than the current from Line Type 2, OHGW connected to the neutral of substaion power transformer. So the Line Type 1 gives the smaller OHGW sizes than Line Type 2. To find the suitable OHGW sizes, the fault current magnitude, the duration time when fault take place and the relay operating time have to be considered. For the short circuit current is not greater than 3 kA, the 25 mm2 can be used. For the short circuit current is not greater than 7 kA, the 35 mm2 should be used for distance of 500 m from the substation, 25 mm2 for line beyond that location should be used. For the short circuit current is not greater than 12 kA, the 50 mm2 should be used for 500 m from substation, 35 mm2 should be used between 500 m-3 km and 25 mm2 for line beyond that location should be used.
Performance of Non Co-phase EGC Diversity Technique with Multiple Antennas on Limited Space
Authors: Ngamjaroen Tanongsak , Uthansakul Peerapong , Uthansakul Monthippa
Published: June 2023

The Equal Gain Combining (EGC) diversity technique is generally known to have a performance close to an optimal Maximal Ratio Combining (MRC) technique while being less complex for realization. Hence, the implementation of EGC in practice is of interest; however the implementation of EGC diversity is cumbersome due to additional circuitry required for making a co-phase signal in each branch. As a result, it is interesting to investigate whether non co-phase EGC diversity is able to provide an acceptable performance while keeping much greatersimplicity with only marginally inferior as compared to co-phase method. This paper studies performance of non co-phase EGC diversity through the problem of limited space on WLAN terminal. This is because the diversity technique in real application cannot determine antenna spacing as large as required in theory. Therefore, it is impossible to avoid the effect of antenna correlation due to limited space. Also in this paper, the measurements of WLAN signals are undertaken in order to justify the use of proposed system. The results reveal that non co-phase EGC diversity provides a benefit on enhancing signal strengths where its performance depends on number of antennas and type of fading channels.
Channel Capacity Evaluation for Urban MIMO Systems Using Path Visibility
Authors: Hemrungrote Sirichai , Hori Toshikazu , Fujimoto Mitoshi , Nishimori Kentaro
Published: June 2023

Multiple-Input Multiple-Output (MIMO) and Multi-User MIMO (MU-MIMO) systems are expected to improve the channel capacity over the limited bandwidth of existing wireless communication networks. The effects on the channel capacity characteristics of Single-User MIMO (SU-MIMO) systems in urban scenarios have been previously studied. In this paper, we first clarify that the larger number of antennas cannot contribute the improvement in the channel capacity in urban SU-MIMO scenarios due to the very high spatial correlation. Next, we focus on the MU-MIMO transmission because it can discriminate multiple users by the difference of Angle of Arrival (AOA). We compare the Multi Access Channel (MAC) capacity in the uplink to the capacity in SU-MIMO by considering the same total numbers of transmitting and receiving antennas between SU-MIMO and MU-MIMO. When the same numbers of the antenna elements are used, the better performance is obtained by urban MU-MIMO systems, unlike in the identical independent distributed (iid) scenarios which are generally assumed in MIMO transmission. Finally, the parameter called path visibility introduced in our previous study is playing an important role once again. It is de¯ned as the probability that the direct wave can be received at the receiving antenna and has been used to determine the channel capacity characteristics and provide guidance in determining the appropriate range for the base station (BS) installation in urban SU-MIMO scenarios. In this study, we clarify that only this single parameter, path visibility, can also be used to determine the improvement in the channel capacity by MU-MIMO in urban scenarios, while both of SNR and spatial correlation must be considered as the indicative parameters on the performance of SU/MU-MIMO in conventional studies.
Design and Performance of 10 Gb/s Optical Receiver in 50-GHz DWDM Transmission over 40-km SSMF
Authors: Worasucheep Duang-rudee , Srisuwarat Wanee , Akaranuchat Jirawut
Published: June 2023

This paper describes the design of 10 Gb/s optical receiver, which consists of an Avalanche Photo Detector (APD) and a Clock & Data Recovery (CDR) circuit. All components are successfully integrated onto the 4-layered FR-4 PCB, using two types of signal paths: di®erential microstrip and single-ended CB-CPW. Their dimensions are optimally chosen for matching impedance, according to the ADS simulations. The receivers performance has been evaluated under 3 impairments: jitter, interchannel crosstalk and fiber dispersion. The Periodic Jitter (PJ) is added to analyze histograms and measure the receivers jitter tolerance. The crosstalk and dispersion effects on eye-diagram are demonstrated via the testbed of 50-GHz Dense Wavelength Division Multi-plexing (DWDM) transmission over 40-km Standard Single Mode Fiber (SSMF). The measured jitter tolerance proves that this receiver can pass the SONET (Synchronous Optical NETwork) mask standard with Bit Error Rate (BER) below 10-12. The recovered eye-diagrams show that this design can reduce both crosstalk and dispersion e®ects. The power penaltyof this receiver is determined from the BER plot to be within 2-dB standard limit.
Two Parallel Algorithms for a Mass Transfer Simulation of Magnetic Nanoparticles
Authors: Hournkumnuard Kanok , Phongpensri Chantana , Dolwittayakul Bunpot , Gorlatch Sergei , Hoefler Torsten
Published: June 2023

We present a comparative study on the performance of two parallel algorithms for simulating mass transfer of weakly magnetic nanoparticles during the process of High Gradient Magnetic Separation (HGMS). The dynamics of mass transfer is investigated statistically in term of particle volume concentration and is described by the continuity equation which is solved numerically using the finite-difference. For parallelization, the concentration data are divided into equal parts that are distributed to a group of parallel processes. Parallel computations are performed by using two communication schemes of MPI, the pair-wise blocking and non-blocking operations. We compare the performance of both schemes interms of parallel speedup, efficiency, and communication overhead. The results show that parallel simulation using the non-blocking communication has better performance than the blocking communication and also shows the better scalability with increasing number of processes.
The Measurement System for Particle Size on Surface of Hard Disk Drive based on Experimental Light Scattering of BRDF Simulation
Authors: Wannaprapa Mongkol , Rungcharoen Narongpun , Pijitrojana Wanchai
Published: June 2023

This work aims to obtain the perfectly measurement system for 200-600 nanometer of particle size, type of SiO2 on surface of Lubricant (n20D ) recording media of hard disk drive, at 448 and 635 nm of incident wavelength. This system uses an incident and reflective angles equally, 89o, based on the principle of Mie scattering theory. Moreover, the system is applied to compare an intensity value of scattered light between of BRDFpart simulation model and of experiment result of David W. Hahn light scattering. For the conclusion, this system could measure the particle sizes and types accurately and efficiently.
Variable Tap-Length Mixed-Tone RLS-based Per-Tone Equalisation with Adaptive Implementation
Authors: Sitjongsataporn Suchada
Published: June 2023

In this paper, a methodology of mixed-tone recursive least squares algorithm development based on an orthogonal projection approach and a new variable tap-length mechanism is presented for per-tone equalisation (PTEQ) in discrete multitone systems. A mixed-tone cost function described as the sum of weight estimated errors is minimised to achieve the solutions for different per-tone equalisers simultaneously. We describe about the inverse square-root recursive least squares algorithm based upon the QRdecomposition which preserves the Hermitian symmetry of the inverse autocorrelation matrix by means of the product of square-root matrix and its Hermitian transpose. Such symmetrical property lends the benefit to the parallel implementation. In order to reduce the computational complexity, a new variable tap-length algorithm based on the sense of mean square mixted-tone errors is introduced to search a proper choice of tap-length of PTEQ. Simulation results show the improvement of achievable bit rate and signal to noise ratio performance as compared to the PTEQ exploiting conventional recursive least squares algorithm.
FIELD OF CREATIVE CULTURE: A STUDY OF CREATIVE MOVEMENT AND INNOVATION OF TERRACOTTA CULTURE IN JATIWANGI, INDONESIA
Authors: Ekomadyo Agus S. , Wijaya Nurrohman , Vardhani Vera J. , Maulana Annas T. , Suhendar Hernadi , Susanto Vanessa
Published: June 2023

Although the creative city concept has received much criticism, the creative movement still occurs to fight for a better city. The decline in the terracotta tile business in Jatiwangi, Majalengka Regency, West Java, Indonesia, has triggered a creative movement to revitalize their identity through the Terracotta City movement. By combining Mihaly Csikszentmihalyi’s field of creativity and Pierre Bourdieu’s cultural capital, this study is carried out to reveal the creative culture of terracotta tile entrepreneurs in Jatiwangi and its relation to the movement. It is found that entrepreneurs’ creative culture is dominantly stimulated by economic capital, and then it is transformed into cultural capital. Innovations are only made, if the market share is clear since it bears economic risks. However, social capital has a role in transforming entrepreneurs’ economic and cultural capital to accept innovation and product diversification. This study also reveals that entrepreneurs as adopters intend to initiate innovation and diversification of terracotta products. However, within the framework of innovation, it shows that creative culture plays a role in incorporating aspects of humanity into innovation activities by giving innovation efforts to represent human beings.
Nondetection of Helium in the Hot Jupiter WASP-48b
Authors: Bennett Katherine A. , Redfield Seth , Oklopčić Antonija , Carleo Ilaria , Ninan Joe P. , Endl Michael
Published: June 2023

Hot Jupiters orbiting extremely close to their host star may experience atmospheric escape due to the large amounts of high-energy radiation they receive. Understanding the conditions under which this occurs is critical, as atmospheric escape is believed to be a driving factor in sculpting planetary populations. In recent years, the near-infrared 10833 Å helium feature has been found to be a promising spectral signature of atmospheric escape. We use transmission spectroscopy to search for excess helium absorption in the extended atmosphere of WASP-48b, a hot Jupiter orbiting a slightly evolved, rapidly rotating F star. The data were collected using the Habitable-zone Planet Finder spectrograph on the Hobby–Eberly Telescope. Observations were taken over the course of seven nights, from which we obtain three transits. No detectable helium absorption is seen, as absorption depth is measured to −0.0025 ± 0.0021, or 1.2σ from a null detection. This nondetection follows our current understanding of decreasing stellar activity (and thus high-energy radiation) with age. We use a 1D isothermal Parker wind model to compare with our observations and find that our nondetection can best be explained with a low planetary mass-loss rate and high thermosphere temperature. We explore our results within the context of the full sample of helium detections and nondetections to date. Surprisingly, comparing helium absorption with the stellar activity index

log

R

HK

′

reveals a large spread in the correlation between these two factors, suggesting that there are additional parameters influencing the helium absorption strength.
The Type II-P Supernova 2019mhm and Constraints on its Progenitor System
Authors: Vazquez J. , Kilpatrick C. D. , Dimitriadis G. , Foley R. J. , Piro A. L. , Rest A. , Rojas-Bravo C.
Published: June 2023

We present pre- and postexplosion observations of the Type II-P supernova (SN II-P) 2019mhm located in NGC 6753. Based on optical spectroscopy and photometry, we show that SN 2019mhm exhibits broad lines of hydrogen with a velocity of −8500 ± 200 km s−1 and a 111 ± 2 day extended plateau in its luminosity, typical of the Type II-P subclass. We also fit its late-time bolometric light curve and infer that it initially produced a 56Ni mass of 1.3 × 10−2 ± 5.5 × 10−4
M
⊙. Using imaging from the Wide Field Planetary Camera 2 on the Hubble Space Telescope obtained 19 yr before explosion, we aligned to a postexplosion Wide Field Camera 3 image and demonstrate that there is no detected counterpart to the SN to a limit of >24.53 mag in F814W, corresponding to an absolute magnitude limit of M
F814W < −7.7 mag. Comparing to massive-star evolutionary tracks, we determine that the progenitor star had a maximum zero-age main-sequence mass <17.5 M
⊙, consistent with other SN II-P progenitor stars. SN 2019mhm can be added to the growing population of SNe II-P with both direct constraints on the brightness of their progenitor stars and well-observed SN properties.
The Impact of Multifluid Effects in the Solar Chromosphere on the Ponderomotive Force under SE and NEQ Ionization Conditions
Authors: Martínez-Sykora Juan , De Pontieu Bart , Hansteen Viggo H. , Testa Paola , Wargnier Q. M. , Szydlarski Mikolaj
Published: June 2023

The ponderomotive force has been suggested to be the main mechanism to produce the so-called first ionization potential (FIP) effect—the enrichment of low-FIP elements observed in the outer solar atmosphere, in the solar wind, and in solar energetic events. It is well known that the ionization of these elements occurs within the chromosphere. Therefore, this phenomenon is intimately tied to the plasma state in the chromosphere and the corona. For this study, we combine IRIS observations, a single-fluid 2.5D radiative magnetohydrodynamics (MHD) model of the solar atmosphere, including ion–neutral interaction effects and nonequilibrium (NEQ) ionization effects, and a novel multifluid multispecies numerical model (based on the Ebysus code). Nonthermal velocities of Si iv measured from IRIS spectra can provide an upper limit for the strength of any high-frequency Alfvén waves. With the single-fluid model, we investigate the possible impact of NEQ ionization within the region where the FIP may occur, as well as the plasma properties in those regions. These models suggest that regions with strongly enhanced network and type II spicules are possible sites of large ponderomotive forces. We use the plasma properties of the single-fluid MHD model and the IRIS observations to initialize our multifluid models to investigate the multifluid effects on the ponderomotive force associated with Alfvén waves. Our multifluid analysis reveals that collisions and NEQ ionization effects dramatically impact the behavior of the ponderomotive force in the chromosphere, and existing theories may need to be revisited.
Identifying Tidal Disruption Events with an Expansion of the FLEET Machine-learning Algorithm
Authors: Gomez Sebastian , Villar V. Ashley , Berger Edo , Gezari Suvi , van Velzen Sjoert , Nicholl Matt , Blanchard Peter K. , Alexander Kate. D.
Published: June 2023

We present an expansion of FLEET, a machine-learning algorithm optimized to select transients that are most likely tidal disruption events (TDEs). FLEET is based on a random forest algorithm trained on both the light curves and host galaxy information of 4779 spectroscopically classified transients. We find that for transients with a probability of being a TDE, P(TDE) > 0.5, we can successfully recover TDEs with ≈40% completeness and ≈30% purity when using their first 20 days of photometry or a similar completeness and ≈50% purity when including 40 days of photometry, an improvement of almost 2 orders of magnitude compared to random selection. Alternatively, we can recover TDEs with a maximum purity of ≈80% and a completeness of ≈30% when considering only transients with P(TDE) > 0.8. We explore the use of FLEET for future time-domain surveys such as the Legacy Survey of Space and Time on the Vera C. Rubin Observatory (Rubin) and the Nancy Grace Roman Space Telescope (Roman). We estimate that ∼104 well-observed TDEs could be discovered every year by Rubin and ∼200 TDEs by Roman. Finally, we run FLEET on the TDEs from our Rubin survey simulation and find that we can recover ∼30% of them at redshift z < 0.5 with P(TDE) > 0.5, or ∼3000 TDEs yr–1 that FLEET could uncover from the Rubin stream. We have demonstrated that we will be able to run FLEET on Rubin photometry as soon as this survey begins. FLEET is provided as an open source package on GitHub: https://github.com/gmzsebastian/FLEET.
First-principles-integrated Study of Blazar Synchrotron Radiation and Polarization Signatures from Magnetic Turbulence
Authors: Zhang Haocheng , Marscher Alan P. , Guo Fan , Giannios Dimitrios , Li Xiaocan , Negro Michela
Published: June 2023

Blazar emission is dominated by nonthermal radiation processes that are highly variable across the entire electromagnetic spectrum. Turbulence, which can be a major source of nonthermal particle acceleration, can widely exist in the blazar emission region. The Turbulent Extreme Multi-Zone (TEMZ) model has been used to describe turbulent radiation signatures. Recent particle-in-cell (PIC) simulations have also revealed the stochastic nature of the turbulent emission region and particle acceleration therein. However, radiation signatures have not been systematically studied via first-principles-integrated simulations. In this paper, we perform combined PIC and polarized radiative transfer simulations to study synchrotron emission from magnetic turbulence in the blazar emission region. We find that the multiwavelength flux and polarization are generally characterized by stochastic patterns. Specifically, the variability timescale and average polarization degree (PD) are governed by the correlation length of the turbulence. Interestingly, magnetic turbulence can result in polarization angle swings with arbitrary amplitudes and duration, in either direction, that are not associated with changes in flux or PD. Surprisingly, these swings, which are stochastic in nature, can appear either bumpy or smooth, although large-amplitude swings (>180°) are very rare, as expected. Our radiation and polarization signatures from first-principles-integrated simulations are consistent with the TEMZ model, except that in the latter, there is a weak correlation, with zero lag, between flux and degree of polarization.
Reflection and Timing Study of the Transient Black Hole X-Ray Binary MAXI J1803-298 with NuSTAR
Authors: Coughenour Benjamin M. , Tomsick John A. , Mastroserio Guglielmo , Steiner James F. , Connors Riley M. T. , Jiang Jiachen , Hare Jeremy , Shaw Aarran W. , Ludlam Renee M. , Fabian A. C. , García Javier A. , Coley Joel B.
Published: June 2023

The transient black hole X-ray binary MAXI J1803−298 was discovered on 2021 May 1, as it went into outburst from a quiescent state. As the source rose in flux it showed periodic absorption dips and fit the timing and spectral characteristics of a hard-state accreting black hole. We report on the results of a Target-of-Opportunity observation with NuSTAR obtained near the peak outburst flux beginning on 2021 May 13, after the source had transitioned into an intermediate state. MAXI J1803−298 is variable across the observation, which we investigate by extracting spectral and timing products separately for different levels of flux throughout the observation. Our timing analysis reveals two distinct potential quasiperiodic oscillations (QPOs) which are not harmonically related at 5.4 ± 0.2 Hz and 9.4 ± 0.3 Hz, present only during periods of lower flux. With clear relativistic reflection signatures detected in the source spectrum, we applied several different reflection models to the spectra of MAXI J1803−298. Here we report our results, utilizing high-density reflection models to constrain the disk geometry, and assess changes in the spectrum dependent on the source flux. With a standard broken power-law emissivity, we find a near-maximal spin for the black hole, and we are able to constrain the inclination of the accretion disk at 75° ± 2°, which is expected for a source that has shown periodic absorption dips. We also significantly detect a narrow absorption feature at 6.91 ± 0.06 keV with an equivalent width between 4 and 9 eV, which we interpret as the signature of a disk wind.
Distribution and Kinematics of H i through Raman He ii Spectroscopy of NGC 6302
Authors: Chang Seok-Jun , Lee Hee-Won , Kim Jiyu , Choi Yeon-Ho
Published: June 2023

The young planetary nebula NGC 6302 is known to exhibit Raman-scattered He ii features at 6545 Å and 4851 Å. These features are formed through inelastic scattering of He ii
λλ 1025 and 972 with hydrogen atoms in the ground state, for which the cross sections are 1.2 × 10−21 cm2 and 1.4 × 10−22 cm2, respectively. We investigate the spectrum of NGC 6302 archived in the ESO Science Portal. Our Gaussian line-fitting analysis shows that the Raman-scattered He ii features are broader and more redshifted than the hypothetical model Raman features that would be formed in a cold static H i medium. We adopt a simple scattering geometry consisting of a compact He ii emission region surrounded by an H i medium to perform Monte Carlo simulations using the radiative transfer code STaRS. Our simulations show that the H i region is characterized by the H i column density N
H I = 3 × 1021 cm−2, with the random speed component v
ran = 10 km s−1 expanding with a speed

v

exp

=
13

km

s

−
1

from the He ii emission region. Based on our best-fit parameters, we estimate the H i mass of the neutral medium M
H I ≃ 1.0 × 10−2
M
⊙, pointing out the usefulness of Raman He ii spectroscopy as a tool to trace H i components.