bluuebunny/crossref_metadata_2025 huggingface dataset:
Hybrid bronzes: mixed-valence organic-inorganic metal oxides as a tunable material platform
Authors: Dayaratne Wedage Lakna , Torres-Cadena Raúl , Schmitt Bennett P. , Westrick Emma M. , Jaffe Adam
Published: July 2023

We demonstrate that mixed-valence layered organic-inorganic metal oxides of the form (L)zHxMO3 (L = neutral ligand; M = Mo, W; z = 0.5, 1; 0 < x < 2), which we call hybrid bronzes, can be readily synthesized through mild solution-state self-assembly reactions to integrate the stability and electronic utility of inorganic metal oxide bronzes with the chemical diversity and functionality of organic molecules. We use single-crystal and powder X-ray diffraction coupled with X-ray, electronic, and vibrational spectroscopies to show that the products of pre-, mid-, or post-synthetic reduction are mixed-valence versions of highly crystalline layered hybrid oxides. Pillared, bilayered, or canted bilayered arrangements of molecular arrays relative to inorganic sheets are dictated by judicious choice of organic ligands that can also incorporate chemical, redox, or photoactive handles. Significantly, bond-valence sum analysis and diffuse reflectance spectroscopy indicate relatively delocalized electronic behavior and four-point variable-temperature electrical transport measurements show that hybrid bronzes have comparable conductivity to their all-inorganic parent compounds. This work establishes a solution-processable, inexpensive, stable, and non-toxic material family whose electronic bands can be readily tuned and doped, thereby positioning hybrid bronzes to address myriad material challenges.
Perancangan Resort di Pesisir Pantai Reviola Kota Batam dengan Pendekatan Arsitektur Bioklimatik
Authors: Al Husaini Muhd Arief
Published: July 2023

Pulau Galang merupakan salah satu daerah yang berada di Kota Batam yang memiliki potensi pariwisata salah satunya wisata alam. Wisata alam yang ada di Pulau Galang seperti Kampung Vietnam dan mempunyai beberapa pantai indah disekitarnya. Pantai Reviola menjadi salah satu pantai yang menjadi potensi Pulau Galang dengan potensi pantai yang memiliki pasir putih dan lokasi yang jauh dari kebisingan kota. Pantai ini merupakan kawasan pesisir yang memerlukan rancangan dengan sebuah pendekatan dala melakukan eksplorasi bentuk. Arsitektur Bioklimatik menjadi salah satu pendekatan yang dapat digunakan sebagai hubungan antara iklim dan bangunan. Pantai Reviola tidak begitu berbeda dengan pantai lainnya yang memiliki site dengan iklim suhu dan kelembaban yang tinggi, memanfaatkan desain pasif berupa meminimalkan pemakaian energi dan ramah lingkungan. Metode penelitian yang digunakan berupa metode kualitatif, pengambilan data baik primer maupun sekunder kemudian di analisa dengan tujuan memiliki fungsi terkait Perancangan Resort di pesisir pantai reviola Kota Batam dengan pendekatan Arsitektur Bioklimatik, sehingga mendapat konsep perancangan yang tepat dan berkualitas.
Kajian Neo-Vernakular Terhadap Kawasan Agrowisata: Studi Kasus Kuntum Farmfield
Authors: Ramdhani Mohamad Rizky , Anisa Anisa
Published: July 2023

Arsitektur Neo-Vernakular merupakan sebuah konsep arsitektur yang menggabungkan bentuk dan aspek arsitektur tradisional dengan desain dan elemen bangunan modern sehingga terbentuk suatu bangunan khas yang didapat dari pencampuran kedua desain yang berbeda satu sama lain. Di dalam sektor pariwisata, banyak bangunan yang memakai pendekatan arsitektural ini sehingga setiap bangunan yang ada di dalam sektor tersebut memiliki ciri khas tersendiri. Penelitian ini dilakukan untuk mengetahui serta memahami penerapan konsep Neo-Vernakular ke dalam desain agrowisata sebagai salah satu cabang sektor pariwisata sebagai studi kasus dalam penelitian. Penelitian menerapkan metode deskriptif kualitatif dengan mengacu kepada prinsip – prinsip Neo-Vernakular. Lokasi studi kasus berada di Kuntum Farmfield, Bogor, Jawa Barat. Hasil dari penelitian yang dilakukan menunjukkan bahwa studi kasus Kuntum Farmfield menerapkan prinsip dari Neo-Vernakular.
Rancangan Ruang Untuk Rumah Tinggal Penyandang Disabilitas Tuna Daksa
Authors: Wijaya I Kadek Merta , Wardana I Wayan Rio , Budiarta I Gede Eka
Published: July 2023

Disability is understood as a state of backwardness or physical, psychological, intellectual, and thinking limitations, which are different from normal humans. These limitations usually hinder the mobility of the disabled and require assistance from normal humans. To increase the self-confidence of the definable, we need a residential design solution suitable for disabled users. The activities that are often and routinely carried out by the disabled are at home, so the design for the definable house requires a structure that adapts to the ergonomics and space elements that can assist the movement and activities of the disabled. This study aims to produce a design concept for a definable residence which is described in terms of space elements that are used as a facilitator for the movement and activities of the disabled. The case study used is a physically handicapped disability. The method used is descriptive qualitative, which emphasizes the design of residential elements based on the characteristics of the disabled community, the education standard, and the form of space required for physically disabled persons. The final result of this research is the design of elements like a ramp, garage, bedroom, and bathroom.
Pengaruh Urban Heat Island Terhadap Aktivitas Fisik di Kota Makassar
Authors: Asfan Mujahid Laode Muh. , Natalia Venny Veronica , Akrim Andi Ahmad Dzaky
Published: July 2023

Kota Makassar sebagai salah satu kota metropolitan dengan tingkat laju pertumbuhan penduduk yang tinggi memiliki potensi terjadinya fenomena Urban Heat Island (UHI). Laju pertumbuhan penduduk Kota Makassar yang terus meningkat berdampak pada peningkatan aktivitas perkotaan yang secara tidak langsung berdampak akan meningkatkan emisi gas rumah kaca dan eksploitasi ruang terbuka hijau yang mempengaruhi suhu permukaan. Peningkatan suhu ini akan memberikan kerugian lingkungan dan penurunan kesehatan dan kenyamanan. Maka dari itu, perlu dilakukan kajian UHI dan upaya mitigasi yang berkelanjutan dan terencana dalam menurunkan suhu permukaan di Kota Makassar. Tujuan penelitian ini adalah untuk mengetahui aktivitas perkotaan apa saja yang berpotensi meningkatkan suhu permukaan, memetakan pola sebaran spasial UHI terhadap struktur ruang Kota Makassar, serta merumuskan rekomendasi mitigasi UHI berdasarkan prinsip pembangunan berkelanjutan. Lokasi penelitian berada di Kota Makassar. Penginderaan jauh merupakan salah satu pendekatan yang digunakan. Metode penelitian yang digunakan berupa metode systematic literature review, analisis spasial, dan analisis deskriptif kualitatif. Hasil dari penelitian menunjukkan terdapat 10 aktivitas perkotaan yang dapat meningkatkan temperatur antara lain operasional kendaaran, eksploitasi ruang terbuka hijau, pembangunan lahan terbangun, serta aktivitas dari sektor industri, permukiman, komersil, pariwisata, perkantoran, pendidikan, dan persampahan. Intensitas UHI Kota Makassar berkisar 0°C hingga 7,25°C dimana pola sebaran UHI dominan menjalar di daerah suburban. Mitigasi UHI yang dilakukan berupa upaya penurunan gas emisi dan penghijauan kondisi vegetasi dengan memperhatikan potensi UHI kedepannya.
UPAYA PEMANFAATAN TEKNOLOGI: APLIKASI RPP DIGITAL DALAM MENINGKATKAN KUALITAS PENDIDIKAN DI SEKOLAH INDONESIA KUALA LUMPUR (SIKL) (STUDI KASUS SEKOLAH INDONESIA KUALA LUMPUR (SIKL))
Authors: Luthfiyana Nurul Hikmah , - Yuliana - , Husna Eva Syafa'atul , Hidayah Nailul - , Nida Shela Khofiyan , Kinesti Rakanita Dyah Ayu
Published: July 2023

The development of Science and Technology increasingly encourages renewal efforts in the use of technology results in the teaching and learning process.  In implementing good learning, we must maximize all learning media in order to achieve learning outcomes.  Thus this learning media can be used as a support and coupling for teaching materials in improving the quality of education.  The Digital RPP application is a technology use to maximize the increase in learning at the Kuala Lumpur Indonesian School (SIKL).  The Digital RPP application aims to facilitate teachers in the teaching and learning process in the current pandemic era.  This study uses a descriptive analytical research method, the research approach uses qualitative studies, with an overview that can find out the efforts to use the Digital RPP Application.  The results showed that the Digital RPP application is useful for teachers so that it has easy access to interactive and fun learning resources.  Thus the Digital RPP application is the main solution for teachers in making lesson plans for that to use technology is highly recommended to improve the quality of education at the Kuala Lumpur Indonesian School (SIKL).
PENINGKATAN HASIL BELAJAR PESERTA DIDIK PADA PEMBELAJARAN TEMATIK TERPADU DENGAN MENGGUNAKAN MODEL KOOPERATIF TIPE TEAMS GAMES TOURNAMENT (TGT) DI KELAS V SDN 05 PASAR BARU KECAMATAN BAYANG KABUPATEN PESISIR SELATAN
Authors: Hilmi Indah Fajri , Lena Mai Sri
Published: July 2023

Penelitian ini menggunakan model kooperatif tipe Teams Games Tournament (TGT) untuk meningkatkan hasil belajar dari peserta didik. Penelitian termasuk jenis PTK menggunakan metode kuantitatif serta kualitatif yang dilakukan dengan II siklus dengan menggunakan observasi serta tes. Guru serta 25 Peserta Didik sebagai subjek yang diteliti. Siklus I hasil penelitian pada RPP tergolong baik memperoleh rata-rata 80%, siklus II 92% tergolong sangat baik. Pada siklus I Penilaian sikap tergolong baik yaitu 87,5, siklus II memperoleh 94% tergolong sangat baik, sedangkan pada siklus I pelaksanaan pembelajaran 84,4% pada aspek peserta didik tergolong baik dan siklus II memperoleh 94% tergolong sangat baik. Pada siklus I penilaian sikap dikategorikan baik, siklus II sangat baik. Pada siklus I skor rata-rata 72% dan pada siklus II Baik dengan 84% Baik untuk hasil belajar peserta didik. Siklus I yaitu 78% ketuntasan adalah cukup, siklus II yaitu 92% sangat baik. Untuk itu penerapan model kooperatif Tipe Teams Games Tournament (TGT) mampu meningkatkan hasil belajar peserta didik dikelas V SD pada penelitian ini.
ANALISIS PEMBELAJARAN IPS DALAM MENGEMBANGKAN KNOWLEDGE, ATTITUDE, SKILL DAN VALUES DI SD LABSCHOOL
Authors: Riadi Fadhilah Salsabila , Maharani Delia , Nimaisa Geovani Sabarhita , Nafisah Syifaun , Istianti Tuti
Published: July 2023

Penelitian ini bertujuan untuk mengetahui pembelajaran Ilmu Pengetahuan Social (IPS) dalam mengembangkan pengetahuan (knowledge), keterampilan (skill), sikap (attitude), dan nilai (values). Penelitian ini menggunakan metode penelitian kualitatif dengan pendekatan deskriptif analisis. Adapun kajian yang digunakan adalah hasil wawancara dan observasi. Peneliti juga menggunakan penelitian yang relevan dari situs web, diantaranya Sinta, DOAJ, dan Google Schoolar. Hasil penelitian ini menunjukan bahwa pengembangan knowledge, skill, attitude dan vanue sudah dikembangkan pada siswa kelas VI SD Laboratorium UPI Kampus Cibiru. Hal ini dilihat dari hasil wawancara dan observasi yang dilakukan oleh peneliti terhadap guru serta siswa kelas VI SD Laboratorium UPI Kampus Cibiru.
Developing Higher Order Thinking Laboratory (Hot-Lab) to Promote General Scientific Reasoning of Student-Teachers in Physics Practices
Authors: Alatas Fathiah , Suryadi Ahmad , Saputra Firman Harris
Published: July 2023

This study aims to develop physics practicum guidelines that can improve students' scientific reasoning. The development of practicum guidelines in this study was based on the principles of the Higher Order Thinking Laboratory (HOT-Lab). Using the ADDIE design, which consists of five stages: analyze, design, develop, implement, and evaluate, general physics practicum guidelines are developed in three parts, namely pre-practicum, lab, and post-practicum. The participants involved consisted of two groups: five experts and 88 students taking general physics courses. The pre-practicum stage is the part that distinguishes this practicum guideline from conventional practicum guidelines, where students are presented with "real-world problems" and opportunities to make hypotheses. The results showed that the practicum guideline products developed were deemed feasible and effective for developing students' scientific reasoning. This study shows that students' scientific reasoning for using practicum guidelines based on HOT-Lab principles is significantly higher than those who use conventional practicum guidelines. In conclusion, the guideline developed was valid, feasible, and effective in improving students’ scientific reasoning. This study recommends considering the features of the HOT-Lab practicum activities to be used for similar practicum activities in other places or relevant courses.
The Implementation of Project Based Learning to Enhance Students' Understanding of Environmental Conservation and Disaster Mitigation
Authors: Londa Treesje Katrina , Kamaruddin Kamaruddin
Published: July 2023

The aim of this research is to provide junior high school students with learning experiences to increase their understanding of environmental conservation and disaster mitigation. This study focuses on reforestation and disaster mitigation efforts through the application of project-based learning models in the surrounding environment. This research was a descriptive study with a post-test design approach, conducted at SMPN Ranoyapo, South Minahasa Regency. There were 42 students of class VII who participated in this study. The results of this research showed that the students' understanding of environmental conservation was in the level of excellent category (26%), good category (48%), fairly good category (24%), and poor category (2%). Meanwhile, the highest average percentage of students' understanding of disaster mitigation efforts was in the excellent category (41%), followed by the good category (39%), fairly good category (16%), and poor category (4%). These results indicate that project-based learning can improve students' understanding of learning, particularly that related to environmental learning.
Development of Electronic Student Worksheet Using Problem-Based Learning Model with the Wizer.me Platform on Momentum and Impulse Materials
Authors: Septiana Sandi , Rizal Rahmat , Makiyah Yanti Sofi
Published: July 2023

This research departs from the problem of limited tools and practicum materials in the laboratory, and students need help understanding the concept of momentum and impulse material. An effort to overcome these problems is to develop an electronic student worksheet using a problem-based learning model with the Wizer.me platform. This study aims to describe the development process, validity level, and practicality of electronic student worksheets using the problem-based learning model with the Wizer.me platform on momentum and impulse material. The research method used is research and development (RD) with the ADDIE development model. The population of this research is all class X MIPA SMA Negeri 13 Garut, consisting of seven classes with 252 students. The research sample was taken by using the cluster random sampling technique for classes X MIPA 1 and X MIPA 2, with 36 students in each class. The data analysis technique used in processing the validation results was Aiken's V index. The results showed that the Aiken index of material, media, and learning experts were respectively 0.91, 0.94, and 0.96 with excellent categories, and the average practicality percentage is 89% with efficient criteria. Therefore, it can be concluded that the electronic student worksheets developed using a problem-based learning model with the Wizer.me platform on the momentum and impulse material meets valid and practical criteria for use in the learning process.
How does Sukuk Investment Perform? A Literature Review
Authors: Alam Azhar , Ratnasari Ririn Tri , Sawinda Wiwin , Al Hakim Muhammad Hanif
Published: July 2023

Purpose:  The aim of this study is to systematically analyze and map the literature on the performance of sukuk using a database obtained from Scopus.
 
Design/Methodology/Approach: The study used a method adopted from the PRISMA system where as many as 478 journals were selected to become fifteen full-text journals which were then analyzed and classified according to their findings. This literature study applies the inclusion criteria of article selection, including sukuk studies that make performance the main study.
 
Findings: The results of the study are presented in descriptive and thematic qualitative synthesis. The descriptive findings section explains that sukuk performance studies have experienced a growth in the number of studies until 2022. The study also describes the most cited articles in the sukuk performance area. In addition, this study also explains the findings in the form of Word Cloud and TreeMap analysis to summarize the main themes in the sukuk study.  The study found and documented the variables the researchers used to measure sukuk investment performance. The study also classifies the existing literature regarding developing and evaluating Sukuk's performance.
 
Research, practical & social implications: The study presented the results of research developments regarding the performance of sukuk so that researchers can determine the extent of research progress and opportunities for further research.  In addition, this research also contributes to providing information to investors by displaying the results of evaluations and developments in the performance of sukuk to make it easier for investors to measure the risk of investing in sukuk.
 
Originality/Value: The value of the study is the first literature study to focus on the performance of sukuk as an instrument of Islamic finance.
Theory Based Modelling of the Relationship Between Emotional States and Bodily Activity Using Machine Learning
Authors:   , Goldsack Roydon
Published: July 2023

The current study uses machine learning with a theoretically derived approach to investigate the relationship between emotion and bodily activity. Previous literature focuses on the accuracy of machine learning models when predicting emotional states. The studies lack theoretical grounding in emotion literature justifying the appropriateness of the chosen machine learning model architectures in predicting emotional states. The current studies’ machine learning models use data from dyadic interactions in positively and negatively valenced conversations. The series of machine learning models apply the same architecture to predict a person’s emotional state using bodily activity. To achieve this the models are trained on multiple measures of a person’s emotional state and bodily activity across differently valenced conversations. For example, a model is trained/tested on emotion measure #1, bodily activity measure #1 and positive conversations. In contrast, another model is trained and tested on emotion measure #1, bodily activity measure #2, and negative conversations. The Test Error resulting from the machine learning models was then statistically tested to answer various questions. The machine learning models trained/tested on emotion measures including the arousal and valence of an emotional state performed the better than those including an emotion measure of how arousal changes over time. The models found that a person’s physiological activity most accurately predicts their emotional state, compared to predicting with the person’s movements. The models trained/tested on negatively valenced conversations predicted people’s emotional states better than those on positively valenced conversations. The results show that not all emotion measures are equal, and the valence and arousal of an emotional state most accurately represent the emotional state. The results replicated the close relationship between emotion and physiological activity. Finally, the context valence alters the accuracy of predicting a person’s emotional state – knowing someone’s situation provides information about their emotional state.
When Students Produce and Receive Peer Feedback at University: Emotions for Learning
Authors: Girardet Céline
Published: July 2023

The aim of this paper is to study students’ perceptions of their learning in relation to feelings/emotions when producing and receiving peer-to-peer feedback as part of a continuous assessment for learning scenario. Results show that producing and receiving peer feedback create positive emotions that can increase motivation and involvement in the tasks, deactivating negative emotions that can decrease motivation and involvement, and activating negative emotions that can promote learning. Emotions of doubt and destabilization regarding content mastery can generate a need to learn, which, combined with some degree of evaluative pressure and sense of responsibility, seem to represent a real trigger for learning. This study shows that it is particularly important to consider the emotional dimensions when implementing peer assessment at university.
History of Professional Education in Minas Gerais: A School Institution That Educates for Work
Authors: Siquelli Sônia Aparecida
Published: July 2023

The focus of this paper is to study school institutions, specifically the campus of Inconfidentes, of the Instituto Federal de Educação, Ciência e Tecnologia do Sul de Minas Gerais (IFSULDEMINAS), Brazil. The aim was to investigate the transformations that occurred in this institution with Law No. 11.892/2008, which transformed it into the campus IFSULDEMINAS. Through bibliographic research and the study of primary and secondary sources organized in inventories, the significant transformation of expansion is highlighted, and the ongoing field of dispute between integral education and technical education is highlighted. This dispute, which has emerged within the institution itself, is also reflected in today’s society, where individuals face the choice between the desire for integral/complete education or a purely technical/competent education in their relationship with work.
The Effect of MMP-9 Inhibitors on the Biological Behavior of Human Oral Squamous Cell Carcinoma SCC15 Cell Line Through PI3K/Akt Signaling Pathway
Authors: Zhuang Zhizheng , Hu Yan , Liu Hongyue
Published: July 2023

Objective: To investigate the effect of MMP-9 inhibitor (Mki67) on the biology of human oral squamous cell carcinoma SCC15 cell line and to explore its mechanism of action through PI3K/Akt signaling pathway. Methods: SCC15 cells were extracted, and the supernatant was discarded. The cells were then rinsed twice with PBS, and 0, 2.5, 5, and 10 μL of Mki67 (50 mg/mL) were added to the culture respectively. The inhibition rate of cell proliferation was detected by 3-(4, 5-dimethylthiazolyl-2)-2,5-diphenyltetrazolium bromide (MTT) method, and the cell migration was measured by Transwell chamber test. The cell apoptosis rate was detected by cytometry, and the p-Akt protein content in the cells of each group was determined by a double-antibody sandwich enzyme-linked immunosorbent assay (ELISA) kit. Results: The cell proliferation rates of the 2.5 μL, 5 μL, and 10 μL dose groups were all lower than the 0 μL group (P < 0.05) before treatment, and the cell proliferation rates in the 2.5 μL, 5μL, and 10μL dose groups decreased overtime (P < 0.05). After 24 h, with the increase of Mki67 concentration, the number of migration and invasion gradually decreased (P < 0.05), and the number of apoptosis gradually increased (P < 0.05); besides, the relative expression of MMP-9, PI3K, and Akt mRNA decreased gradually (P < 0.05), and the expression level of Akt mRNA was not statistically significant (P > 0.05). Conclusion: MMP-9 inhibitor (Mki67) can inhibit the proliferation and migration of SCC15 cell line and induce apoptosis, and its mechanism of action may be related to the inhibition of PI3K/Akt signaling pathway.
Cross-Band Repeater HAM Radio berbasis SDR dan Raspberry Pi untuk Tanggap Darurat Bencana Alam
Authors: ISDWIHARDJO ALDIL BHASKORO ANGGITO , TULLOH ROHMAT , NURMANTRIS DWI ANDI
Published: July 2023

ABSTRAKIndonesia merupakan negara rawan bencana alam yang dampaknya dapat melumpuhkan akses tekomunikasi publik. Hal ini menjadi penghambat ketika proses koordinasi evakuasi korban bencana. Diperlukan alternatif untuk berkomunikasi, seperti radio genggam atau Handy Transceiver (HT). Namun HT memiliki kekurangan pada jangkauanya yang terbilang kecil sekitar 2 – 5 Km tanpa penghalang. Untuk mengatasi kekurangan tersebut, Pada penelitian ini dilakukan perancangan dan realisasi cross band repeater (XBR) HAM radio berbasis Software Defined Radio (SDR) dan Raspberry-Pi. XBR HAM radio merupakan Radio Pancar Ulang dengan menerapkan 2 frekuensi yang berbeda pada sisi uplink dan downlink. Hasil pengujian pada area penduduk dengan intensitas padat menunjukkan bahwa XBR HAM radio yang telah dibuat dapat menjangkau area sejauh 8,8 Km dengan pancaran maksimal sebesar 10 watt serta penguatan pada SDR sebesar 49.6 dB pada ketinggian 15 meter.Kata kunci: Cross band repeater, HAM Radio, Raspberry-Pi, SDR ABSTRACTIndonesia is prone to natural disasters whose impact can paralyzing access to public telecommunication. It becomes an obstacle in the process of consolidating disaster victims. An alternative is needed to communicate, such as a handheld radio or Handy Transceiver (HT). However, HT has a disadvantage in its relatively small range of around 2-5 Km without obstructions. This study designed and realized a cross-band repeater (XBR) HAM radio based on Software Defined Radio (SDR) and Raspberry Pi to resolve the issue. XBR HAM Radio is a Retransmission Radio that applies two different frequencies on the uplink and downlink sides. Test results in residential areas with dense intensity show that the XBR HAM radio that has been made can reach an area of 8.8 km with a maximum beam of 10 watts and a gain of 49.6 dB at an SDR at the height of 15 meters from the gorundKeywords: Cross band repeater, HAM Radio, Raspberry-Pi, SDR
Kendali Kestabilan Kecepatan Vane Motor Pneumatik Berbasis PID
Authors: Setiadi Budi , Mulyono Nanang , Purnama Hari , Ulhaq Hilmi Dhiya
Published: July 2023

ABSTRAKKestabilan putaran berpengaruh terhadap kwalitas hasil pembuatan cat. Penelitian ini, fokus mengidentifikasi pengendalian kestabilan kecepatan putaran pada plan vane motor pneumatik saat bergangguan. Gangguan pengereman mekanik dan penurunan tekanan inlet sumber energi angin. Plan disetting berputar 250 rpm. Sistem pengendalian digunakan digital-PID (Proportional- Integral- Derivative ) dengan nilai parameter Kp, Ki, Kd dari hasil analisa zeigler nichols. PID mengatur bukaan katup yang mengalirkan angin melalui plan. Umpan balik sistem kecepatan digunakan sebagai koreksi error. Sistem stabil dengan error steady state (ESS ) 0,46%. Saat bergangguan mekanik 5% overdamped 1,5 detik , overshoot 3,65% dan gangguan 10% overdamped 3,3 detik, overshoot 7,71%. Saat gangguan inlet 0,45 bar overdamped 3 detik, overshoot 2,54% dan gangguan inlet 1,2 bar overdamped 4,3 detik, overshoot tetap.ABSTRACTThe rotational stability affects the quality of the paint productions. This research focuses on identifying the control of rotational speed stability on a pneumatic motor plan vane when it is disturbed. Disturbance of mechanical braking and a decrease in the inlet pressure of the wind energy source. The plan is set to rotate at 250 rpm. The control system used digital-PID (Proportional-Integral-Derivative) with parameter values Kp, Ki, Kd from the results of Zeigler Nichols analysis. PID regulates valve openings that allow air to flow through the plan. Speed system feedback is used as error correction. The system is stable with a steady state error (ESS ) 0.46%. When the mechanical disturbance is 5% overdamped for 1.5 seconds, overshoot is 3.65% and 10% is overdamped for 3.3 seconds, overshoot is 7.71%. When the inlet disturbance is 0.45 bar overdamped for 3 seconds, the overshoot is 2.54% and the inlet fault is 1.2 bar overdamped for 4.3 seconds, the overshoot remains the same.
Pengaruh Rasio Penambahan Air Terhadap Produksi Biogas dari Sampah Kampus Bina Widya Universitas Riau dengan Metode Wet Anaerobic Digestion
Authors: Sasmita Aryo , Elystia Shinta , Mulyadi Robi
Published: July 2023

ABSTRAKSampah yang dihasilkan dari kegiatan kampus setiap harinya di Universitas Riau memiliki potensi untuk dimanfaatkan sebagai energi alternatif berupa biogas. Beberapa penelitian sebelumnya belum menganalisis variasi rasio penambahan air untuk melihat pengaruhnya terhadap produksi biogas. Tujuan penelitian ini mengetahui bagaimana potensi produksi biogas dari sampah Kampus Bina Widya Universitas Riau dan pengaruh variasi rasio penambahan air terhadap produksi biogas yang dihasilkan menggunakan metode wet biodigester anaerob. Pada penelitian ini dilakukan variasi rasio penambahan air 50%, 100%, dan 150% terhadap sampah masukan (w/w). Penelitian ini menggunakan Reaktor berukuran 60 L, volume sampah organik sebesar 5 Kg, Penambahan mikroba EM4 sebesar 9% dengan waktu tinggal reaktir selama 28 hari. Hasil penelitian menunjukkan produksi volume biogas terbesar terdapat dalam perlakuan A2 yaitu campuran sampah organik kampus dan air (100% : 100%) sebesar 14 ml dan produksi biogas per hari tertinggi terdapat pada perlakuan A2 campuran sampah: air (150% : 100%) dan A3 campuran sampah dan air (100%:150%) yaitu sebesar 1,5 ml/hari. Produksi biogas sangat dipengaruhi oleh konsentrasi substrat yaitu campuran sampah organik dan air. Di mana konsentrasi rasio yang seimbang akan menghasilkan biogas yang lebih banyak.ABSTRACTWaste generated from campus activities every day at Riau University has the potential to be used as alternative energy in the form of biogas. Several previous studies have not analyzed variations in the ratio of addition of water to see its effect on biogas production. The purpose of this study was to analysed the potential for biogas production from the Binawidya Campus waste, Riau University and the effect of the ratio of addicted of water to the production of biogas produced using the anaerobic wet biodigester method. In this study, variations in the ratio of the addition of water to 50%, 100%, and 150% of the input waste (w/w). This study used a reactor measuring 60 liter, the volume of organic waste was 5 Kg, the addition of EM4 microbes was 9% with a reactor residence time of 28 days. This research showed that the largest biogas production volume was found in treatment A2, namely a mixture of campus organic waste and water (100%: 100%) of 14 ml and the highest biogas production per day was found in treatment A2, a mixture of waste: water (150%: 100%) and A3. a mixture of waste and water (100%:150%) which is 1.5 ml/day. Biogas production is strongly influenced by the substrate concentration, namely a mixture of organic waste and water. Where a balanced concentration ratio will produce more biogas.
Intensitas Bising dan Pemetaan Kebisingan dengan Surfer 13 di Lingkungan Kerja PT Hok Tong Jambi
Authors: Afrizal Romi , Anggraini Febri Juita , Yasdi Yasdi
Published: July 2023

ABSTRAKPT Hok Tong Jambi merupakan perusahaan yang bergerak dalam bidang pengolahan karet remah (crumb rubber), dimana dalam proses produksinya tidak terlepas dari bantuan mesin-mesin dan peralatan produksi yang dapat menghasilkan kebisingan yang tinggi. Tingginya tingkat kebisingan di lingkungan kerja PT Hok Tong Jambi dapat meningkatkan potensi bahaya bising terhadap pekerja. Penelitian ini dilakukan untuk mengetahui intensitas bising dan pola sebaran kebisingan dari 45 titik di lingkungan kerja PT Hok Tong Jambi dengan Software Surfer 13. Penentuan titik pengukuran bising menggunakan metode titik sampling dengan jarak antartitik 10 meter dan pengukuran kebisingan dengan metode sederhana yang berpedoman pada Keputusan Menteri Negara Lingkungan Hidup Nomor 48 Tahun 1996 tentang Baku Mutu Tingkat Kebisingan. Hasil pengukuran tingkat kebisingan menunjukkan bahwa tingkat kebisingan di lingkungan kerja PT Hok Tong Jambi telah melebihi Nilai Ambang Batas (85 dB) yaitu berkisar 66,5 â€“ 99,8 dBA. Tingkat kebisingan tertinggi berasal dari area produksi basah (titik 32) dengan intensitas bising sebesar 99,8 dBA, sedangkan kebisingan terendah berasal dari area kantor (titik 9) dengan intensitas bising sebesar 66,5 dBA. Berdasarkan hasil pemetaan kebisingan yang telah dibuat diperoleh bahwa sumber kebisingan utama bersumber dari area produksi seperti area produksi basah, produksi kering, bahan baku, kamar jemur, penindihan, area press, pompa IPAL dan kamar mesin.ABSTRACTPT Hok Tong Jambi is a company engaged in the processing of crumb rubber (crumb rubber), where the production process is inseparable from the assistance of production machines and equipment that can produce high noise. The high level of noise in the work environment of PT Hok Tong Jambi can increase the potential for noise hazards to workers. This research was conducted to determine the noise intensity and distribution patterns of noise from 45 points in the work environment of PT Hok Tong Jambi with Software Surfer 13. Determination of noise measurement points using the point sampling method with a distance of 10 meters and noise measurement using a simple method based on the Ministerial Decree State of the Environment Number 48 of 1996 concerning Quality Standards for Noise Levels. The results of noise level measurements indicate that the noise level in the work environment of PT Hok Tong Jambi has exceeded the Threshold Value (85 dB), which ranges from 66., â€“ 99,8 dBA. The highest noise level came from the wet production area (point 32) with a noise intensity of 99,8 dBA, while the lowest noise came from the office area (point 9) with a noise intensity of 66,5 dBA. Based on the results of the noise mapping that has been made, it is found that the main noise sources come from production areas such as wet production areas, dry production areas, raw materials, drying rooms, press areas, WWTP pumps and machine rooms.Â
Analisis Proksimat dan Bilangan Yodium Sebagai Kajian Awal Aarang Tempurung Nipah Sebagai Bahan Intermediate Karbon Keras
Authors: Rahayu Theresia Evila Purwanti Sri , Nurhilal Mohammad , Dwityaningsih Rosita
Published: July 2023

ABSTRAKKarbon keras sebagai anoda baterai ion sodium memiliki kapasitas penyimpanan ion sodium yang paling tinggi diantara karbon lunak dan grafit karena struktur ikatan karbonnya paling acak sehingga akan menyediakan ruang lebih luas untuk insersi ion sodium. Material karbon keras dapat diperoleh dari biomassa yang murah dan melimpah ketersediaannya. Penelitian ini bertujuan sebagai studi pendahuluan untuk mengetahui potensi nipah sebagai bahan bahan intermediate karbon keras melalui analisis proksimat dan penentuan bilangan yodium. Tempurung nipah diarangkan pada suhu 300 oC selama 1 jam tanpa aktivasi kimia. Arang yang diperoleh dikarakterisasi kadar air, volatile matter, abu, dan fixed carbon sesuai metode ASTM D1762-84 dengan sedikit modifikasi serta penentuan bilangan yodium sesuai metode dalam SNI 06-3730-1995. Kandungan air dan zat anorganik yang cukup rendah ditunjukkan dengan kadar air dan kadar abu masing-masing 5,00% dan 9,97 %, kadar volatile matter dan fixed carbon sebesar 42,93% dan 42,11%, sedangkan bilangan yodium yang dimiliki sebesar 346,86 mg/g.Â ABSTRACTHard carbon as an anode of a sodium ion battery has the highest sodium ion storage capacity compared to soft carbon and graphite because it has the most random carbon bond structure providing large enough space for sodium ion insertion. Hard carbon materials can be obtained from biomass which is cheap and abundant in availability. This study aims as a preliminary study to determine the potential of nypa shell charcoal as an intermediate material for hard carbon through proximate analysis and determination of iodine numbers. Nypa shells carbonized at a temperature of 300 oC for 1 hour without chemical activation. The charcoal obtained is characterized by moisture, volatile matter, ash, and fixed carbon content according to the ASTM D1762-84 method with a slight modification while iodine number is determined according to the method in SNI 06-3730-1995. Low water content and inorganic substance content indicated by moisture and ash content of 5.00% and 9.97% respectively, volatile matter and fixed carbon are 42.93% and 42.11% while iodine number is 346.86 mg/g.
Perencanaan Sistem Penyediaan Air Bersih Di Terminal Antar Lintas Batas Negara (ALBN) Sungai Ambawang, Kabupaten Kubu Raya
Authors: Dentry Dentry , Utomo Kiki Prio , Sutrisno Hendri
Published: July 2023

ABSTRAKTerminal ALBN Sungai Ambawang merupakan fasilitas umum yang masih belum memiliki sistem penyediaan air bersih yang memadai. Air hujan merupakan sumber air yang dapat dimanfaatkan dalam skala komunal. Pemanfaatan air hujan sebagai sumber air bersih dapat dilakukan dengan metode pemanenan air hujan dari atap bangunan. Hasil perencanaan menunjukan pemanfaatan air hujan dapat memenuhi kebutuhan air bersih di terminal ALBN Sungai Ambawang. Total kebutuhan air bersih di terminal ALBN Sungai Ambawang sebesar 2074,383 m3/tahun, Total supply air hujan yang dapat ditangkap oleh atap gedung ruang tunggu dan kantor dengan total luas atap 1062 m2 yaitu sebesar 2774,343 m3/tahun dan supply air hujan yang tersisa sebesar 699,960 m3/tahun. Kapasitas ground water tank di gedung ruang tunggu direncanakan sebesar 158 m3, sedangkan di gedung kantor direncanakan sebesar 60 m3. Karena kapasitas ground water tank eksisting (96,39 m3) jauh lebih besar dibandingkan dengan ground water tank direncanakan (60 m3), sehingga ground water tank eksisting dapat dimanfaatkan. Estimasi biaya pembuatan sistem penyediaan air bersih dari air hujan di terminal ALBN Sungai Ambawang adalah sebesar Rp 614.835.771,72.Kata kunci: Terminal, Air Hujan, Sistem Pemanenan Air HujanABSTRACTThe Sungai Ambawang ALBN terminal is a public facility that still does not have an adequate clean water supply system. Rainwater is a source of water that can be utilized on a communal scale. Utilization of rainwater as a source of clean water can be done by harvesting rainwater from the roof of the building. The results of the planning show that the use of rainwater can meet the needs of clean water at the Sungai Ambawang ALBN terminal. The total demand for clean water at the Sungai Ambawang ALBN terminal is 2074.383 m3/ year, the total supply of rainwater that can be captured by the roof of the waiting room and office building with a total roof area of 1062 m3 is 2774,343 m3/ year and supply the remaining rainwater is 699,960 m3/year. The ground water tank capacity in the waiting room building is planned to be 158 m3, while in the office building it is planned to be 60 m3. Because the capacity of the existing ground water tank (96.39 m3) is much larger than the planned ground water tank (60 m3), the existing ground water tank can be utilized. The estimated cost of making a clean water supply system from rainwater at the Sungai Ambawang ALBN terminal is IDR 614,835,771.72.Keywords: Terminal, Rainwater, Rainwater Harvesting System
Synthesis, characterization and thermal behaviour of solid state compounds of 2-chlorobenzylidenepyruvate with trivalent aluminium, gallium, indium and scandium metals
Authors: Bannach Gilberto , Schnitzler Egon , Ionashiro Massao
Published: July 2023

Solid state compounds M-2-Cl-BP, where 2-Cl-BP is 2-chlorobenzylidenepyruvate and Mrepresents Al, Ga, In, and Sc were prepared. X-ray powder diffractometry, infrared spectroscopy andsimultaneous thermogravimetry-differential thermal analysis (TG-DTA), have been used to characterizeand to study the thermal behavior of these compounds. The results provided information concerning thestoichiometry, crystallinity, thermal stability and thermal decomposition of the compounds.
Eletrocatálise da reação de redução de oxigênio sobre eletrodos de grafite modificados com ftalocianina tetracarboxilada de ferro §
Authors: Chaves José Alberto Pestana , Araújo Marcelo Fernando Antão , Varela Júnior Jaldyr de Jesus Gomes , Tanaka Auro Atsushi
Published: July 2023

Este trabalho apresenta um estudo das propriedades eletroquímicas de eletrodos de grafitemodificados, em níveis de monocamadas, com ftalocianina tetracarboxilada de ferro, FeTcPc, em soluçõesaquosas. Em meio alcalino, os eletrodos modificados apresentaram alta atividade eletrocatalítica para areação de redução de oxigênio, comparável com a do eletrodo de platina. A reação processa-se de acordocom uma cinética de primeira ordem com relação ao oxigênio dissolvido, um mecanismo envolvendo 4elétrons e associado com o processo redox Fe(3+)TcPc/Fe(2+)TcPc.
Electrochemical and physical characterization of Ni-Cu-Fe alloy for chlor-alkali hydrogen cathodes
Authors: De Giz Martha Janete , Marengo Melisa Caballal , Ticianelli Edson Antonio , Gonzalez Ernesto Rafael
Published: July 2023

This work describes the development of an alternative acetate bath for the electrochemicalcodeposition of Ni-Cu-Fe electrodes at low pH that is stable for several weeks and produces electrodeswith good performance for chlor-alkali electrolysis. Physical characterization of the electrode surfacewas made using X ray absorption spectroscopy (XAS), scanning electron microscopy (SEM) and energydispersive analysis (EDX). The evaluation of the material as electrocatalyst for the hydrogen evolutionreaction (her) was carried out in brine solution (160 g L -1 NaCl + 150 g L -1 NaOH) at different temperaturesthrough steady-state polarization curves. The Ni-Cu-Fe electrodes obtained with this bath have shownlow overpotentials for the her, around 0.150 V at 353 K, and good stability under continuous long-termoperation for 260 hours. One positive aspect of this cathode is that the polarization behavior of thematerial shows only one Tafel slope over the temperature range of 298 – 353 K.
Determinação voltamétrica do nedocromil de sódio utilizando eletrodo de carbono vítreo
Authors: Rosa Thais Fernanda , Saczk Adelir Aparecida , Zanoni Maria Valnice Boldrin , Stradiotto Nelson Ramos
Published: July 2023

Estudos eletroanalíticos foram realizados com o Nedocromil de Sódio empregando as técnicasvoltamétricas de varredura linear, pulso diferencial e onda quadrada, em tampão Britton-Robinson (pH4,0). No estudo voltamétrico empregando a modalidade de varredura linear observou-se dois picoscatódicos, irreversíveis, nos valores de potencial de -0,86 V e -1,10 V (vs ECS). As correntes de picocatódicas apresentaram um controle difusional segundo a relação I pc versus v 1/2 . A dependência de I pccom a concentração apresentou linearidade entre 5,0x10 -4 mol L -1 e 5,0x10 -3 mol L -1 , limite de detecçãode 8,2x10 -5 mol L -1 e sensibilidade de 6,3x10 3 mA/ mol L -1 . Na voltametria de pulso diferencial oNedocromil de Sódio apresentou dois picos catódicos, irreversíveis, nos valores de potencial de -0,67 Ve -0,75 V (vs ECS). Curvas analíticas foram obtidas no intervalo de 3,0x10 -6 mol L -1 a 1,0x10 -5 mol L -1 ,limite de detecção de 4,9x10 -7 mol L -1 e sensibilidade de 8,7x10 4 mA/ mol L -1 .
Determinação de ultratraços de selênio em urina por geração de hidretos e espectrometria de absorção atômica em fluxo
Authors: Coelho Nivia Maria Melo , Baccan Nivaldo
Published: July 2023

A determinação de selênio utilizando a geração de hidretos acoplada às técnicas atômicas vêmsendo utilizada com sucesso em amostras de urina. Devido a necessidade de se dispor de um métodoanalítico capaz de determinar pequenas quantidades de selênio; é proposto o sistema de fluxo, por zonascoalescentes, utilizando a técnica de geração de hidretos, seguida da detecção por espectrometria deabsorção atômica para a determinação de selênio em amostras de urina. O limite de detecção obtido é 0,3ng mL -1 , correspondendo a 30 pg de selênio e a freqüência analítica de 140 determinações por hora. Aprecisão (d.p.r.) do método foi de 2,0% para 1,0 ng mL -1 . A quantidade de reagente (0,5 mg de NaBH 4para cada determinação) e de resíduo químico gerado no laboratório (170 mL h -1 ) é mínima. A aplicaçãodo método proposto para análises de amostras de urina evidenciou a presença média de 4,0 ng mL -1 deselênio para pacientes que não ingeriram nenhum medicamento contendo selênio. Para pacientes queingeriram uma dose única de medicamento contendo selênio, o teor encontrado nas amostras de urinaanalisadas variaram de 5,0 a 16,0 ng mL -1 .
Mobilidade conformacional de complexos entre calix[4]arenos e aminas: evidências para estruturas exo-calix
Authors: Nachtigall Francine Furtado , Nome Faruk , Lazzarotto Márcio
Published: July 2023

Os espectros de RMN de sais de calix[4]areno e aminas alifáticas , em acetonitrila, mostraramvalores de deslocamento químico dos hidrogênios do calix[4]areno próximos entre si para as diversasaminas. Foram obtidas as temperaturas de coalescência ( t c ), acompanhando os hidrogênios metilênicosentre 32 e 38 o C para os sais de calixareno com as aminas e o aumento de t c deve-se ao aumento dabasicidade da amina e não a fatores relacionados com o volume. Os dados estão de acordo com umaproposta exo-cálix, em que os cátions amônio situam-se fora da cavidade do calixareno.
Influência da taxa de dose na degradação do herbicida ácido diclorofenóxiacético (2,4-d) por meio da radiação gama do cobalto-60
Authors: De Campos Sandro Xavier , Sanches Sérgio Marcos , Falone Sandra Zago , Vieira Eny Maria
Published: July 2023

Métodos convencionais de descontaminação ambiental, algumas vezes apenas transferem es-ses resíduos de um lugar para outro. Esse estudo tem como objetivo checar a influência de diferentestaxas de doses de radiação gama do cobalto-60 na degradação do herbicida 2,4-D, em água e metanol.Os resultados mostraram que o 2,4-D, em água, foi totalmente degradado em uma dose de 30 kGy,utilizando-se taxa de dose de 2,7 kGy h -1 e 20 kGy com uma taxa de dose de 5- 60 kGy h -1 . Para ometanol, a total degradação do 2,4-D ocorreu com uma dose de 150 kGy e taxa de dose de 2,7 kGy h -1 e100 kGy utilizando-se taxa de dose de 5- 60 kGy h -1 . Assim conclui-se que a degradação do herbicida2,4-D é dependente da dose e da taxa de dose de radiação.O valor radiolítico da degradação do 2,4-D foicalculado.
Flow injection spectrophotometric determination of adrenaline using a solid-phase reactor containing triiodide ions immobilized in an anion-exchange resin
Authors: Vieira Heberth Juliano , Fatibello-Filho Orlando
Published: July 2023

A flow injection spectrophotometric procedure with on-line solid-phase reactor containingion triiodide immobilized in an anion-exchange resin is proposed for the determination of adrenaline(epinephrine) in pharmaceutical products. Adrenaline is oxidized by triiodide ion immobilized in ananionic-exchange resin yielding adrenochrome which is transported by the carrier solution and detectedat a wavelength of 488 nm. Adrenaline was determined in three pharmaceutical products in the 6.4 x 10 -6 to 3.0 x 10 -4 mol L -1 concentration range with a detection limit of 4.8 x 10 -7 mol L -1 . The recovery of thisanalyte in three samples ranged from 96.0 to 105 %. The analytical frequency was 80 determinations perhour and the RSDs were less than 1 % for adrenaline concentrations of 6.4 x 10 -5 and 2.0 x 10 -4 mol L -1(n=10). A paired t-test showed that all results obtained for adrenaline in commercial formulations usingthe proposed flow injection procedure and a spectrophotometric batch procedure agree at the 95%confidence level.
Fotoquímica e fotofísica do ácido 1,4-bis(3-carbóxi-3-oxo-prop-1-enil)benzeno
Authors: Bariccatti Reinaldo Aparecido , Da Rosa Maurício Ferreira , De Oliveira José Dilson Silva
Published: July 2023

Este trabalho versa sobre a caracterização espectroscópica do ácido 1,4-bis(3-carbóxi-3-oxo-prop-1-enil)benzeno, substância com potencialidade em complexação de íons metálicos. Para isto foramobtidos espectros de UV/VIS do composto em meio aquoso na presença e ausência de irradiação noultra-violeta. Foram obtidos um coeficiente de extinção molar de 36.457 L mol -1 cm -1 e uma taxa dedegradação de 5,2.10 -7 mol L -1 min -1 , quando se irradiou uma solução do composto cuja concentraçãoera de 3,2.10 -5 mol L -1 em uma cubeta de quartzo de 10mm de caminho ótico a 7,0cm de uma lâmpadade mercúrio de 80W.