bluuebunny/crossref_metadata_2025 huggingface dataset:
Multiscale Model for Hydrogen Chloride Uptake on Aluminum for Spacecraft Fire Safety
Authors: Niehaus Justin E. , Mazumder Sandip
Published: March 2024

An electrical fire within spacecraft environments often produces poisonous gases, such as hydrogen chloride (HCl). These gases adsorb on the interior materials of the spacecraft, primarily treated aluminum surfaces. A safe design of the spacecraft can be facilitated by modeling the spacecraft compartment. In this study, a multiscale model is developed to predict HCl uptake by anodized aluminum, which has a thick oxide layer covering its surface compared to other treatments. X-ray photoelectron spectroscopy revealed that aluminum chloride is found deep in the oxide layer of anodized aluminum, implying that the pore-scale transport and reaction of HCl within the oxide layer covering the aluminum surface must be considered. Hence, a multiscale approach is warranted. A pore-scale model is first developed, wherein the HCl reacts with the aluminum oxide pore walls to create an aluminum chloride layer. The HCl then diffuses through that layer for further reaction, until the layer (diffusion resistance) grows too large and the uptake of HCl stops. This pore-scale model is coupled with a reactor-scale model to predict overall HCl uptake. Results show that this new multiscale approach predicts the uptake of HCl far more accurately when compared to experimental data than previously used single (reactor)-scale models.
Delayed Detached-Eddy Simulations of Rough-Wall Turbulent Reactive Flows in a Supersonic Combustor
Authors: Pelletier Guillaume , Ferrier Marc , Vincent-Randonnier Axel , Scherrer Dominique , Mura Arnaud
Published: March 2024

Reactive delayed detached-eddy simulations (DDESs) of hydrogen injection into a confined transverse supersonic flow of vitiated air are conducted. The corresponding conditions were studied in the LAPCAT-II combustor, which—due to thermal coating—exhibits non-negligible wall roughness. Its effects are taken into account with the equivalent sand-grain roughness model, and, to the best of the authors’ knowledge, it is the first time that this modeling framework is considered within the DDES framework to simulate turbulent reactive flows. Two operating conditions are considered, which differ in the value of the momentum ratio between the hydrogen and vitiated air inlet streams, thus leading to two distinct values of the operating equivalence ratio (ER). For its smallest value, smooth combustion is subject to a preliminary thermal runaway period, while for its largest value, combustion is more strongly intertwined with shock wave dynamics and boundary-layer separation. Since it features large subsonic regions, which are characteristic of situations close to thermal choking, the latter is referred to as the sudden or partially choked combustion mode. Computational results are assessed through comparisons with available experimental data for both operating conditions. The main mechanism through which wall roughness alters the combustion development lies in the reduction of the effective cross-sectional area that is induced by boundary-layer thickening. For the largest ER value, DDES conducted with the sand-grain roughness model does recover the partially choked combustion mode, while smooth wall (i.e., standard) DDES does not.
Flow Dynamics of a Dodecane Jet in Oxygen Crossflow at Supercritical Pressures
Authors: Ding Siyu , Li Jiabin , Wang Longfei , Ni Chenxu , Wang Xingjian
Published: March 2024

In advanced aeropropulsion engines, liquid fuel is often injected into the combustor at supercritical pressures, where flow dynamics are distinct from the subcritical counterpart. Large-eddy simulation, combined with real-fluid thermodynamics and transport processes of a liquid N-dodecane jet in oxygen crossflow, is presented at different supercritical pressures and jet-to-crossflow momentum flux ratios ([Formula: see text]). Various vortical structures are discussed in detail. The results show that, with the same velocity ratio of 0.75, the upstream shear layer (USL) is absolutely unstable at high supercritical pressure ([Formula: see text]) and convectively unstable at low supercritical pressure ([Formula: see text]), consistent with the empirical criterion at subcritical pressures ([Formula: see text]). While decreasing [Formula: see text] to 7.1 at low supercritical pressure, however, the USL remains convectively unstable, manifested by the variable dominant Strouhal number of the USL along the upstream jet trajectory. Such abnormal behavior can be attributed to the real-fluid effect induced by strong density stratification at low supercritical pressure, under which an inflection point in the upstream mixing layer renders a large density gradient and tends to stabilize the USL. Linear stability analysis further verifies these findings. The analysis of spatial mixing deficiencies reveals that the mixing efficiency is enhanced at a higher [Formula: see text].
ENSURING SUSTAINABLE DEVELOPMENT OF UKRAINE IN THE UNCERTAIN AND TURBILENT ENVIRONMENT
Authors:   Chernihiv Polytechnic National University, Dubyna Maksym , Serdiuk Denys ,   Chernihiv Polytechnic National University
Published: March 2024

The concept of this development involves harmonious interaction between people and the environment in which they live and work. First of all, ensuring the sustainable development model of society is associated with the transformation of the principles of the economic system functioning in society. Sustainable development of society can only be achieved through the interaction of significant financial resources, as the introduction of modern innovations that contribute to the transformation of the social, environmental and economic systems based on sustainability requires significant investment. This is especially difficult for the countries that do not have such resources and do not have a favourable investment climate.Ukraine is currently facing extremely difficult conditions for its own development. The war has led to complex economic, environmental and social disruptions, the effects of which are still deepening. Accordingly, all processes and efforts aimed at creating conditions for the country’s sustainable development were levelled and are partially in vain. However, the desire of Ukraine to integrate into the EU economic area also requires the adoption of the adoption of the basic principles of the functioning of European countries, which strategies of the national development focus on sustainable development.The article deals with theoretical provisions of ensuring sustainable development of society under the conditions of uncertainty and turbulence of its functioning. In particular, the author analyses the essence of sustainable development, identifies the main causes of uncertainty and non-stationarity of economic development, and substantiates the goals of this development. Based on the analysis of the sustainable development index, within the article, the current trends in the implementation of the sustainable development model in countries are identified. Also, within the article, the retrospective and current trends on the implementation of the sustainable development model in Ukraine are examined, and the impact of the war of possible use of this model is specified.It is determined that in Ukraine, under current conditions, the issues of sustainable development are not a priority. However, in the period of the post-war reconstruction,they need to be given significant attention and a reconstruction model should be formed in such that it takes into consideration the achievement of the main goals of sustainable development. This will also help modernise the national economy, restore its innovative potential and improve the quality of life and living conditions of citizens, which will have a positive impact on the country’s attractiveness for living, the return of people from abroad, and their inclusion in the country’s economic life
Ferramentas para diagnóstico de apendicite aguda na infância
Authors: Siqueira Eithor Henrique , Queiroz Aline Trovão , Santos Felipe de Souza , Aquino João Vítor Romão Neto Mury de , Weksler Guilherme Lima , Fernandes Luiz Felipe Alves
Published: March 2024

Objetivo: Analisar diferentes ferramentas de diagnóstico de apendicite em crianças. Métodos: Foi feita uma busca nas plataformas National Library of Medicine (PubMed), LILACS e Cochrane restando um total de 15 artigos. Tendo como critério de inclusão artigos publicados nos últimos 3 anos, texto completo e grátis, estudo clínico, ensaio clínico randomizado e controlado, ensaio clínico controlado e estudo observacional, artigos em inglês, português e espanhol. E tendo como critério de exclusão artigos de revisão de literatura, resumos e meta-análise, artigos com fuga do tema proposto e duplicados. Resultados: Foram encontrados cinco artigos que usavam marcadores sanguíneos para avaliação diagnóstica como: contagem de bilirrubina, marcador LRG1, relação neutrófilo/linfócito, PCR, IL-6 e hiponatremia apresentaram um bom rendimento. Já o marcador N-GAL e a contagem de plaquetas apresentaram um moderado rendimento. Foi ainda analisado em três artigos a escala clínica-laboratorial Alvarado, tendo como resultado positivo em dois e negativo em um. A calculadora pARC não reduziu o uso de exames de imagem para confirmação diagnóstica. Considerações finais: Através da análise dos trabalhos foi evidenciado que ainda não existe um consenso quanto a melhor ferramenta para diagnóstico de apendicite na infância. Em conclusão, é necessário que haja a combinação de ferramentas para um melhor manejo.
Pólipo fibroepitelial estromal vulvar: um relato de caso
Authors: Zeme Paulo de Tarso Talarico , Paula Neto Lázaro Luiz de , Ferreira Gabriela Santos , Vilela Melina Cury
Published: March 2024

Objetivo: Relatar o caso de uma paciente com pólipo fibroepitelial estromal em vulva atendida em um município do interior de São Paulo, revisando cientificamente o assunto, incluindo quadro clínico, diagnóstico e terapêutica. Detalhamento do caso: Paciente do sexo feminino, 46 anos, procura pronto socorro municipal devido lesão vulvar de grande volume, rugosa, pediculosa, dolorosa e com sangramento esporádico, resultando em prejuízo para realização das atividades diárias. O quadro foi insidioso, com crescimento progressivo e acarretou prejuízo funcional. Paciente foi encaminhada para hospital terciário, onde realizou exérese da lesão, com material enviado a análise anatomopatológica. O resultado do estudo imuno histoquímico evidenciou pólipo fibroepitelial estromal com positividade para receptores de estrogênio. Considerações finais: O pólipo fibroepitelial é um tipo de tumor benigno que pode acometer diversas regiões do corpo, com baixa prevalência na vulva. É mais comum nas mulheres obesas, hipertensas e diabéticas. Quando apresentam receptor de hormônio torna-se uma lesão mais rara e facilmente confundida com tumor maligno. O quadro clínico é variável e depende do tamanho e tempo de evolução da lesão, sendo a exérese seu tratamento.
Understanding parabens – A literature review
Authors: Rafi Shifa Mohamed , Hazrami Zainab Saleh Sayeed Al Jabri , Nayeem Madeeha , Richard Riya Mary , Alurkar Shaista Rizwan Ahamed , Korrapati Naga Harika
Published: March 2024

Parabens are esters of p-hydroxybenzoic acid that are widely used in cosmetic, pharmaceutical, and industrial products, among other excipients, for their preservative and antimicrobial properties. However, since the late 1900s, parabens’ use and safety have been surrounded by controversies relating to the potential causes of endocrine disruption, infertility, allergic skin reactions, and various cancers. Despite parabens being under a cloud of suspicion, these compounds have succeeded in extensive skin testing conducted by a variety of organizations in the United States. By dispelling misconceptions about the Paraben Paradox Theory, our review is aimed at determining the safety of topically applied parabens in cosmetics, the availability of alternatives, and their side effects.
KONSTRUKSI MATERI DAN PRAKSIS PEMBELAJARAN SEJARAH KONTROVERSIAL G-30-S/PKI ERA POST TRUTH
Authors: Hartono Yudi , Huda Khoirul , Arseat Rani Lily
Published: March 2024

Abstrak Penelitian ini bertujuan mengungkap kontruksi materi, praksis pembelajaran, dan reproduksi pengetahuan sejarah kontroversial G-30-S/PKI, serta pertautan dengan konteks di luarnya, yaitu situasi masyarakat Indonesia pasca Reformasi dan fenomena era post truth. Metode penelitian kualitatif ekslporatif. Pengumpulan data dengan wawancara, observasi, dan studi dokumentasi. Data divalidasi dengan triangulasi sumber. Analisis data dengan analisis wacana kritis dari Fairclough. Hasil penelitian menemukan bahwa konstruksi materi G-30-S/PKI merepresentasikan situasi masyarakat Indonesia pasca Reformasi yang ditandai dengan dimasukannya berbagai versi serta digunakannya istilah G 30 S dan G-30-S/PKI sekaligus, namun dalam praksis pembelajaran dan reproduksi pengetahuan di masyarakat masih didominasi satu versi yang ditandai dengan penggunaan media film G-30-S/PKI dan sumber pengetahuan lain dalam versi yang sama. Terdapat pertautan antara wacana (teks/materi), praksis pembelajaran, dan reproduksi pengetahuan sejarah kontroversial Gerakan 30 September 1965 dengan konteks masyarakat Indonesia pasca Reformasi yang secara umum masih menyimpan memori traumatik tentang komunisme, faktor kebijakan pemerintah terhadap pendidikan sejarah, serta fenomena era post truth. Abstract This study aims to reveal the construction of materials, learning praxis, and reproduction of the controversial historical knowledge of the G-30-S/PKI, as well as the relationship with the context outside, namely the situation of post-Reformation Indonesian society and the phenomenon of the post-truth era. Explorative qualitative research method. Collecting data by interview, observation, and study documentation. Data were validated by triangulation of sources. Data analysis with critical discourse analysis from Fairclough. The results of the study found that the material construction of the G-30-S/PKI represented the situation of Indonesian society after the Reformation, which was marked by the inclusion of various versions and the use of the terms G 30S and G-30-S/PKI at once, but in the practice of learning and reproducing knowledge in society. still dominated by one version which is marked by the use of the G-30-S/PKI film media and other sources of knowledge in the same version. There is a link between discourse (text/material), learning praxis, and reproduction of controversial historical knowledge of the 30 September 1965 Movement with the context of post-Reformation Indonesian society, which in general still retains traumatic memories of communism, government policy factors for historical education, and the phenomenon of the post-truth era. .
PEMBELAJARAN BAHASA INDONESIA DENGAN MENGGUNAKAN MODEL PEMBELAJARAN BERBASIS (PROBLEM BASED LEARNING) PADA SISWA KELAS VI SD NEGERI CEPOKO KECAMATAN PANEKAN KABUPATEN MAGETAN
Authors: Fidiasri Fidyah , Cahyono Bambang Eko Hari , Soleh Dwi Rohman
Published: March 2024

AbstrakPenelitian ini bertujuan untuk menjelaskan dan mendiskripsikan pelaksanaan pembelajaran model PBL (Problem Bassed Learning) pada siswa kelas VI SDN Cepoko Panekan Magetan. Pendekatan yang digunakan adalah penelitian diskriptif kuantitatif. Hasil penelitian yang berkaitan dengan permasalahan yang muncul pada penerapan pembelajaran model PBL : (1) Penggunaan model pembelajaran PBL, terdapat kendala yaitu: (a) Kemampuan guru dalam memahami dan menerapkan model tersebut dalam  pembelajaran; b) Ketidaksesuaian pemilihan model dengan karakteristik materi; (c) siswa kurang aktif dalam merespons diskusi, (d) siswa kekurangan ide, (e) siswa kurang percaya diri dalam menyampaikan pendapat. Di samping hal itu kendala model pembelajaran PBL yaitu: (1) Guru belum terbiasa mengelola kelas dengan menerapkan model pembelajaran PBL; (2) Siswa belum terbiasa belajar dengan berkelompok; (3) Siswa belum terbiasa terlibat aktif dalam pembelajaran; (2) Hasil test belajar siswa dalam pelaksanaan pembelajaran bahasa Indonesia, siswa yang belum tuntas dalam belajarnya sebanyak 2 siswa atau 11,11% (perolehan nilai < KKM), sedangkan siswa yang tuntas belajar sebanyak 16 orang atau 88,89% (perolehan nilai > KKM).  AbstractThis study aims to explain and describe the implementation of the PBL (Problem Based Learning) learning model in class VI students at SDN Cepoko Panekan Magetan. The approach used is quantitative descriptive research. The results of research related to the problems that arise in the application of the PBL learning model: (1) The use of the PBL learning model, there are obstacles, namely: (a) The teacher's ability to understand and apply this model in learning; b) Incompatibility of model selection with material characteristics; (c) students are less active in responding to discussions, (d) students lack ideas, (e) students lack confidence in expressing opinions. In addition to this, the obstacles to the PBL learning model are: (1) Teachers are not used to managing classes by applying the PBL learning model; (2) Students are not used to learning in groups; (3) Students are not used to being actively involved in learning; (2) The results of student learning tests in the implementation of Indonesian language learning, students who have not completed their learning are 2 students or 11.11% (acquired scores  KKM).
PENERAPAN MODEL DISCOVERY LEARNING BERBANTUAN MULTIMEDIA VIDEO UNTUK MENINGKATKAN KEMAMPUAN MEMBACA INTENSIF PADA SISWA KELAS 6 SDN 2 TEMON KECAMATAN SAWOO KABUPATEN PONOROGO
Authors: Maryani Sri , Parji Parji , Soleh Dwi Rohman
Published: March 2024

Abstrak Penelitian ini bertujuan untuk meningkatkan kemampuan membaca intensif melalui penerapan model problem discovery learning berbantuan multimedia video pada siswa kelas VI di SDN 2 Temon Kecamatan Sawoo Kabupaten Ponorogo. Penelitian ini dilaksanakan dalam dua siklus pembelajaran. Di mana setiap siklus terdiri dari tahap penelitian, perencanaan, pelaksanaan, pengamatan, dan refleksi. Subjek dalam penelitian ini adalah siswa kelas VI di SDN 2 Temon Kecamatan Sawoo Kabupaten Ponorogo yang berjumlah 18 siswa pada semester I tahun pelajaran 2021/2022, dan objek penelitiannya adalah kemampuan membaca intensif. Hasil penelitian menunjukkan bahwa pembelajaran Bahasa Indonesia khususnya membaca intensif melalui penerapan model discovery learning berbantuan multimedia video dapat meningkatkan kemampuan membaca intensif siswa kelas VI di SDN 2 Temon Kecamatan Sawoo Kabupaten Ponorogo. Hal ini terbukti dari hasil observasi dan analisis data pada setiap siklusnya. Peningkatan aktivitas siswa dalam pembelajaran siklus I sebesar 71,88% meningkat menjadi 81,25% di siklus II.  Meningkatnya persentase ketuntasan belajar klasikal kemampuan membaca intensif pada siklus I sebesar 72,22% meningkat disiklus II sebesar 83,33%. Serta meningkatnya respon siswa pada siklus I sebesar 72,22% meningkat di siklus II sebesar 88,89%. AbstractThis study aims to improve intensive reading skills through the application of a multimedia video-assisted problem discovery learning model for sixth grade students at SDN 2 Temon, Sawoo District, Ponorogo Regency. This research was carried out in two learning cycles. Where each cycle consists of the stages of research, planning, implementation, observation, and reflection. The subjects in this study were class VI students at SDN 2 Temon, Sawoo District, Ponorogo Regency, a total of 18 students in semester I of the 2021/2022 academic year, and the object of the research was intensive reading skills. The results showed that learning Indonesian especially intensive reading through the application of a video-assisted discovery learning model could improve the intensive reading skills of class VI students at SDN 2 Temon, Sawoo District, Ponorogo Regency. This is evident from the results of observation and data analysis in each cycle. The increase in student activity in cycle I learning was 71.88%, increasing to 81.25% in cycle II. The increase in the percentage of completeness in classical learning for intensive reading in cycle I was 72.22%, an increase in cycle II was 83.33%. As well as an increase in student responses in the first cycle of 72.22%, an increase in the second cycle of 88.89%.
PENERAPAN REALISTIC MATHEMATICS EDUCATION (RME) UNTUK MENINGKATKAN KEMAMPUAN MENGHITUNG PADA SISWA KELAS V SEKOLAH DASAR
Authors: Muliana Tasya Dian , Chasanatun Fida , Kartikasari HS Apri
Published: March 2024

Siswa kesulitan belajar matematika karena konsep materi pembelajaran Matematika belum bisa dipahami murid. Tujuan dilakukan penelitian ini dilakukan untuk mengetahui peningkatan kemampuan menghitung materi operasi hitung pecahan (penjumlahan berpenyebut berbeda) dapat meningkat atau tidak. Jenis penelitian ini adalah Penelitian Tindakan Kelas (PTK) yang terdiri dari siklus I dan siklus II. Prosedur penelitiannya yaitu perencanaan, pelaksanaan, observasi, dan refleksi. Penelitian ini dilaksanakan di SDN 01 Taman dengan subjek penelitian siswa kelas V C berjumlah 7 siswa yang memiliki kemampuan menghitung rendah. Pengumpulan data dalam penelitian ini menggunakan observasi, wawancara, dan dokumentasi. Teknik analisis data yang digunakan adalah data kuantitatif dan kualitatif. Hasil penelitian menunjukkan bahwa dengan penerapan model pembelajaran realistic mathematics education dapat membantu meningkatkan kemampuan menghitung siswa. Hal tersebut dibuktikan dari meningkatkan kemampuan menghitung siswa dari kondisi pra siklus yang hanya menunjukkan bahwa 71% siswa memiliki kemampuan menghitung, kemudian pada siklus I menunjukkan 81%, dan pada siklus II menunjukkan bahwa 87% siswa memiliki kemampuan menghitung
EFIKASI EDUKASI GIZI MELALUI COOKING DEMO DAN POSTER GIZI SEIMBANG PADA IBU BALITA STUNTING
Authors: Wibowo Moh. Ari , Adhianata Heni , Iskandar Zaldy
Published: March 2024

Prevalensi stunting merupakan masalah gizi kronis yang ada di Indonesia. Anak yang menderita stunting lebih rentan terkena penyakit dan gangguan kesehatan lainnya. Dampak stunting terhadap anak tidak hanya masalah kesehatan saja, namun juga berpengaruh terhadap tingkat kecerdasan. Salah satu upaya penanggulangan dan pencegahan stunting dapat dilakukan melalui  edukasi gizi terhadap ibu dan anak. Jenis dan metode edukasi gizi akan sangat berpengaruh terhadap efektivitas program edukasi gizi yang diberikan terhadap masyarakat. Pemilihan metode harus sesuai dengan sasaran audien agar materi dapat dengan baik tersampaikan kepada masyarakat target. Poster merupakan media edukasi gizi yang mudah diaplikasikan serta dapat menarik minat masyarakat untuk memperhatikan kegitan penyampaian materi. Cooking demo merupakan metode edukasi yang komunikatif dan menarik yang dapat diaplikasikan dalam pemberian edukasi gizi. Metode yang digunakan dalam penelitian ini adalah kuasi eksperimen. Penelitian ini bertujuan untuk mengetahui efikasi dari edukasi gizi menggunakan poster gizi dan cooking demo dalam meningkatkan pengetahuan gizi ibu balita stunting. Hasil penelitian menunjukkan bahwa terdapat peningkatan pengetahuan gizi ibu yang signifikan pada perlakuan intervensi gizi dengan menggunakan poster dan cooking demo pada kelompok intervensi. Sehingga dapat disimpulkan bahwa edukasi gizi dengan menggunakan poster gizi dan cooking demo merupakan metode yang efektif dalam peningkatan pengetahuan gizi ibu balita.Kata Kunci:  Stunting; Edukasi gizi; Cooking demo; Poster gizi seimbang
Struktur Komunitas Ikan Kakatua (Scaridae) di Selatan Pulau Kabung Kabupaten Bengkayang, Kalimantan Barat
Authors: Ramadhan Helmi , Helena Shifa , Nurrahman Yusuf Arief
Published: March 2024

Ikan kakatua merupakan satu di antara ikan karang yang dapat membantu kehidupan yang ada pada ekosistem terumbu karang. Ikan kakatua dapat dijadikan sebagai bioindikator kesehatan terumbu karang karena kelompok ikan ini mengontrol pertumbuhan makroalga yang dapat menghambat pertumbuhan karang baru dengan menyediakan substrat terbuka sebagai tempat melekat koloni karang muda. Penelitian ini bertujuan untuk mengetahui kelimpahan ikan kakatua di bagian selatan Pulau Kabung, Kabupaten Bengkayang, Kalimantan Barat menggunakan metode Underwater Visual Census (UVC). Cara kerja metode ini yaitu dengan membentangkan transek di area terumbu karang sepanjang 50 m sejajar dengan garis pantai. Lebar batasan transek 2,5 m kebagian kiri dan kanan. Berdasarkan hasil penelitian, didapatkan 100 individu dari 5 spesies ikan kakatua yang berasal dari 2 genus. Kelimpahan ikan kakatua berkisar antara 0,05-0,19 ind/m2. Kelimpahan ikan kakatua tertinggi berada di Stasiun 4 sebesar 0,19 ind/m2 sedangkan kelimpahan terendah terdapat di Stasiun 1 sebesar 0,05 ind/m2. Kondisi perairan Pulau Kabung (salinitas, suhu, oksigen terlarut/DO, kecerahan dan kecepatan arus) dapat digolongkan dalam kategori baik. Berdasarkan hasil penelitian dapat disimpulkan bahwa kondisi perairan mendukung untuk kehidupan ikan kakatua.
Simpanan Karbon pada Sedimen Mangrove di Kedalaman Berbeda di Desa Jeruju Besar Kalimantan Barat
Authors: Sumarni Goreti , Nurrahman Yusuf Arief , Minsas Sukal
Published: March 2024

Ekosistem mangrove berperan penting dalam penyimpanan karbon dan layak menjadi kajian dalam ekosistem Blue Carbon. Mangrove memanfaatkan CO2 untuk proses fotosintesis dan menyimpannya dalam stok biomassa dan sedimen sebagai  upaya mitigasi perubahan iklim. Perkiraan penyimpanan karbon pada ekosistem mangrove begitu besar sehingga penting untuk menghitung persentase estimasi simpanan karbon pada sedimen mangrove di Desa Jeruju Besar, Kalimantan Barat. Penelitian ini bertujuan untuk mengetahui serapan karbon tersimpan pada sedimen mangrove di kedalaman yang berbeda dan mengetahui parameter fisika kimia pada daerah perairan. Penentuan titik lokasi pengamatan menggunakan metode purposive sampling, sedangkan pengambilan sampel sedimen mangrove dilakukan dengan metode stratified sampling. Data yang dianalisis adalah bulk density, Presentase bahan organik sedimen dan presentase karbon organic pada sedimen. Hasil penelitian menunjukkan bahwa jumlah karbon total di ekosistem mangrove di Desa Jeruju Besar berkisar antara 3379,91-3905,29  ton/ha. Simpanan karbon yang paling tinggi yaitu di kedalaman 30-60 cm pada stasiun III yaitu 5224,70 ton/ha.
Analisis FTIR dari Ekstrak Cair Sargassum polycystum dan Padina australis Asal Perairan Lemukutan
Authors: Mardini Delvia Devi , Sofiana Mega Sari Juane , Safitri Ikha
Published: March 2024

Rumput laut coklat Sargassum polycystum dan Padina australis dapat tumbuh pada substrat berbatu, berpasir dan karang mati. Sargassum dan Padina telah dilaporkan memiliki aktivitas antibiotik dan antibakteri. Rumput laut jenis ini juga memiliki kandungan zat pengatur tumbuh, vitamin, asam alginat, fukoidan dan zat mineral. Sargassum polycystum dan Padina australis ditemukan melimpah di perairan pulau Lemukutan, namun belum dimanfaatkan secara optimal oleh masyarakat setempat. Oleh karena itu, penelitian ini bertujuan untuk mengetahui kandungan senyawa kimia pada ekstrak cair Sargassum polycystum dan Padina australis dengan identifikasi gugus fungsi menggunakan FTIR. Ekstraksi dilakukan dengan tiga perlakuan, ekstraksi pada pH 3; 7; dan 9 dengan bantuan pemanasan. Filtrat yang diperoleh selanjutnya diidentifikasi gugus fungsinya. Intensitas puncak serapan pada spektra FTIR yang diperoleh menunjukkan adanya penurunan dikarenakan perlakuan asam dan basa. Hasil identifikasi gugus fungsi dari spektra mengindikasikan adanya gugus OH, C-H alifatik karbohidrat, C=O pada ester, gugus sulfat, C-O-C dengan ikatan β-1,4-glikosidik, dan S=O. Beberapa gugus fungsi ini menunjukkan adanya karakteristik dari  fukoidan yang muncul pada ekstrak cair Sargassum polycystum dan Padina australis pada semua perlakuan pH.
Analisis Kandungan Proksimat dan Makro Mineral pada Gastropoda Mangrove Desa Sungai Nibung Kalimantan Barat
Authors: Pratiwi Mutiara Anugerah , Safitri Ikha , Warsidah Warsidah
Published: March 2024

Desa Sungai Nibung berada di Kecamatan Teluk Pakedai Kabupaten Kubu Raya Kalimantan Barat. Desa ini memiliki potensi sumber daya alam dengan keanekaragaman hayati yaitu ekosistem mangrove. Gastropoda merupakan salah satu biota yang paling banyak hidup di ekosistem mangrove. Daging pada gastropoda dapat dikonsumsi oleh masyarakat      sebagai sumber protein tinggi dan rendah lemak tanpa diketahui komposisi nutrisi dari gastropoda ini. Untuk itu tujuan penelitian ini adalah mengetahui kandungan proksimat dan makro mineral pada gastropoda. Nerita merupakan gastropoda mangrove di Desa Sungai Nibung yang memiliki kandungan proksimat dan makro mineral. Kandungan proksimat yaitu kadar air, kadar abu, kadar protein, kadar lemak, dan kadar karbohidrat dianalisis berdasarkan metode AOAC 2016, dan analisis makro mineral (Mg, Ca, Na, K, dan P) di analisis berdasarkan metode AOAC 2016 dengan spektrofotometri serapan atom. Kadar air dan kadar abu di analisis menggunakan metode gravimetri. Kadar protein dihitung berdasarkan metode kjeldahl. Kadar lemak di analisis dengan metode soxhlet. Kadar karbohidrat dihitung berdasarkan metode sulfat – uv. Nerita memiliki kadar protein 6,6 %, dan kadar lemak 0,64%. Nerita juga mengandung beberapa makro mineral seperti magnesium, kalsium, natrium, kalium, dan fosfor. Hasil menunjukkan bahwa nerita dapat dijadikan alternatif bahan makanan berprotein dan rendah lemak.
Identifikasi Alat Penangkapan Ikan Ramah Lingkungan di Perairan Batam
Authors: Devina Almira Marsha , Panggabean Donwill
Published: March 2024

Operasi penangkapan ikan menggunakan alat tangkap tidak ramah lingkungan dapat menimbulkan dampak negatif bagi lingkungan serta dapat menyebabkan overfishing. Penelitian ini bertujuan untuk mengetahui keragaman jenis alat tangkap ikan berdasarkan indikator ramah lingkungan di perairan Kota Batam dan sekitarnya. Penelitian ini dilaksanakan pada bulan Mei 2023, dan penelitian ini menggunakan metode survei melalui pendekatan studi kasus, responden ditentukan secara purposive, dan menggunakan analisis deskriptif dan expert choice. Pengumpulan data primer melalui observasi langsung di lapangan dan wawancara kepada stakeholder, data sekunder diperoleh melalui literatur dari berbagai sumber. Dari hasil penelitian ini didapatkan 7 jenis alat penangkapan ikan utama, yaitu pancing (dengan skor 33), bubu lipat (35), purse seine (27), jaring tangkul/jaring karang (28), rawai (34), gillnet (30), dan kelong (18). Alat penangkapan ikan yang termasuk kategori sangat ramah lingkungan adalah pancing, bubu lipat, jaring tangkul/karang rawai, dan gillnet. Sedangkan yang termasuk kategori ramah lingkungan adalah purse seine, yang tidak ramah lingkungan adalah kelong.
Understanding Electrochemically Induced Olefin Complexation: Towards Electrochemical Olefin-Paraffin Separations
Authors: Akashige Toshihiro , Vemuri Ramraj , Urbina Blanco Cesar , Modestino Miguel
Published: March 2024

Olefin-paraffin separation is a critical yet energy-intensive process in the chemical industry, accounting for over 250 trillion BTU/year of global energy consumption. This work explores the use of redox-active nickel maleonitriledithiolate complex for olefin-paraffin separations. Key performance factors, namely the electrochemical oxidation of the complex and the olefin capture utilization fraction, were systematically quantified. Electrochemical studies revealed near-complete oxidation of Ni(II) to Ni(IV) species, suggesting that the electrochemical oxidation step is not a limiting factor in olefin capture. The utilization fraction was found to be strongly dependent on the complexation equilibrium behavior between olefin-bound and unbound state of the complex. Time-resolved kinetic measurements unveiled a sluggish complexation rate, requiring over 36 hours to approach equilibrium. These insights highlight the importance of driving the complexation equilibrium and improving the kinetics to enhance the performance of Ni-based electrochemical swing absorbers for energy-efficient olefin-paraffin separations. The findings lay the groundwork for future optimization strategies and industrial implementation of this sustainable separation technology.
Supramolecular chemistry of an antiaromatic tetrapyrrole: zinc(II) norcorrole
Authors: Bradley David , Tian Ruoming , Bhadbhade Mohan , Macreadie Lauren , Sarowar Chowdhury , Peeks Martin
Published: March 2024

Zinc norcorrole was prepared by metalation of freebase norcorrole in the presence of pyridine. Zinc norcorrole is isolated as its pyridine complex, which is square-pyramidal at zinc. The pi-conjugated norcorrole fragment is appreciably curved, as demonstrated by both X-ray crystallography and nuclear magnetic resonance (NMR) spectroscopy, the latter of which shows characteristic ring current deshielding effects. Ligand exchange of pyridine with the bidentate ligand DABCO results in the (ZnNc)2•DABCO sandwich complex, which is also characterised by crystallography and NMR spectroscopy. The NMR resonances of the axial ligands in all of the complexes demonstrate that the ring current in zinc norcorrole is approximately 40 nA/T, which is comparable in magnitude to that in porphyrin. Analysis of the ligand-exchange processes on addition of DABCO to ZnNc•pyridine show that zinc norcorrole coordinates to axial nitrogen-containing ligands with approximately 10^3-fold higher binding constants than analogous porphyrins.
Neural network potentials for exploring condensed phase chemical reactivity
Authors: Gomez Axel , de la Puente Miguel , David Rolf , Laage Damien
Published: March 2024

Recent advances in machine learning offer powerful tools for exploring complex reaction mechanisms in condensed phases via reactive simulations. In this tutorial review, we describe the key challenges associated with simulating reactions in condensed phases, we introduce neural network potentials and detail how they can be trained. We emphasize the importance of active learning to construct the training set, and show how these reactive force fields can be integrated with enhanced sampling techniques, including transition path sampling. We illustrate the capabilities of these new methods with a selection of applications to chemical reaction mechanisms in solution and at interfaces.
Organophotoredox Catalyzed C‒O Bond Cleavage: A Chemoselective Deprotection Strategy for Phenolic Ethers and Esters Driven by the Oxophilicity of Silicon
Authors: Mandal Tanumoy , Islam Malekul , Mahapatra Sanat Kumar , Das Sanju , Azim Aznur , Roy Lisa , De Sarkar Suman
Published: March 2024

An organo-photocatalyzed approach for the chemoselective dealkylation and de-esterification of phenols is developed by employing trimethyl silyl chloride as the C‒O bond activator and 9-Mes-10-MeAcr+ClO4‒ as the photoredox catalyst. This method demonstrates an exceptional selectivity towards the cleavage of phenolic ethers and esters over equivalent aliphatic scaffolds, presenting a broad range of functional group sustainability. This strategy also enables selective debenzylation of phenols in the presence of reduction-sensitive functional groups. The photocatalytic efficiency was further extrapolated in the fragmentation of lignin models and synthetic modification in manufacturing a FLAP inhibitor. Mechanistic studies, photophysical experiments and computations provide evidence for the involvement of an oxonium intermediate, generated through the photo-oxidation of the arene ring, which ultimately leads to the selective disintegration of C‒O bond, facilitated by the oxophilicity of silicon.
ANALISIS KELAYAKAN USAHTANI PORANG DI LAHAN YANG KERING DESA JULUMATE'NE KECAMATAN BONTOLEMPANGAN KABUPATEN GOWA
Authors: - Nasrullah , Natsir Mohammad , Saleh Muh. Ikmal
Published: March 2024

Penelitian ini bertujuan untuk mengetahui Analisis usahatani porang di lahan yang kering Desa Julumate’ne Kecamatan Bontolempangan Kabupaten Gowa   Petani usahatani porang di Desa Julumate’ne Kecamatan Bontolempangan Kabupaten Gowa sebanyak 25 0rang. Teknik penentuan sampel yang digunakan yaitu metode sensus (semua populasi dijadikan sebagai sampel). Pengambilan data dilaksanakan dengan cara wawancara menggunakan kousioner. Hasil penelitian ini menunjukkan bahwa pendapatan usahatani porang yang diperoleh  nilai dari net benefit cost  B/C Racio sebesar Rp. 8,938,401,083 artinya layak untuk dikembangkan.  Hasil penelitian ini menunjukkan bahwa analisis usahatani porang di Desa Julumate’ne Kecamatan Bontolempangan Kabupaten Gowa. Kelayakan usahatani porang di peroleh nilai nepresent value sebesar Rp. 33,622,726.19 dan nilai internal rate of return sebesar 9,005,646,536 artinya layak untuk dikembangkan. Kata kunci: Kelayakan, Usahatani, Produksi
PERAN KOPERASI DALAM USAHATANI BAWANG MERAH DI KECAMATAN SAPE KABUPATEN BIMA
Authors: Arwati Sitti , Anwar Andi Rahayu , Fatmasari Reni , Putra Ardian
Published: March 2024

Koperasi memegang peran sentral dalam mendukung kelangsungan dan perkembangan usahatani bawang merah. Sebagai lembaga ekonomi berbasis keanggotaan, koperasi tidak hanya menjadi wadah bagi para petani bawang merah untuk berkolaborasi, tetapi juga memberikan kontribusi signifikan dalam berbagai aspek kegiatan pertanian. Dengan mengakomodasi kebutuhan bersama, koperasi berperan dalam peningkatan akses petani terhadap sumber daya dan peningkatan kesejahteraan ekonomi. Tujuan dalam penelitian ini adalah untuk mengkaji peran koperasi dalam menunjang kegiatan usahatani bawang merah di Kecamatan Sape Kabupaten Bima. Metode penelitian yang digunakan adalah metode deskriftif kualitatif dengan mengumpulkan data melalui wawancara, observasi dan studi dokumentasi. Informan penelitian melibatkan petani bawang merah dan pengurus Koperasi Bina Usaha (KBU). Hasil penelitian menunjukkan bahwa KBU memiliki peranan penting untuk menjembatani petani dalam mengakses, input produksi, penyediaan modal, penyuluhan dan lain-lainnya. Selain itu, KBU juga menyediakan akses ke fasilitas kredit atau pembiayaan yang membantu petani bawang merah memenuhi kebutuhan modal untuk penanaman, pemeliharaan, dan panen dalam usahatani bawang merah. Kata kunci: Peran koperasi, usahatani, bawang merah
A novel approach to smart autonomous monitoring of indoor plant health based on leaf color
Authors: H. Parthasarathi Patra , Gandatti Sridhar , Lateefa Shaik
Published: March 2024

Automation of technology is being implemented in various fields, including deep space research and the automobile industry. However, the real necessity for automation is identified in the agricultural sector. Therefore, this paper focuses on addressing this requirement and is primarily concerned with automating the determination of a plant's health based on the color content present in any one of its leaves, while simultaneously monitoring it. A plant's leaf is examined, and the algorithm makes the decision of whether to provide water and light whenever there is a notable change in the leaf's color. The automation of watering and lighting is explained in detail in the proposed methodology. This paper explores the vital role of automation in agriculture, focusing on using color analysis of plant leaves to automate health assessment. The algorithm used monitors and responds to color changes, enabling informed decisions on water and light provision for optimal plant growth.
CHARTING A STRATEGIC MODEL FOR POST-COVID-19 TOURISM DESTINATION DEVELOPMENT: INSIGHTS FROM RIAU ISLANDS' TOP FOREIGN-TOURIST CITIES, INDONESIA
Authors: Rianty Rilla , Arafah Willy , Nurbaeti  , Ingkadijaya Rahmat , Sundring Pantja Djati
Published: March 2024

Purpose: The purpose of the research is to evaluate the impact of the COVID-19 pandemic on the tourism industry in the Riau Islands Province, Indonesia, and to reformulate a strategic model for developing tourist destinations, focusing on Batam City and Bintan Island.
 
Theoretical framework: This study examines the impact of the COVID-19 pandemic on the Riau Islands, Indonesia, focusing on revitalizing the tourism sector. It aims to formulate a strategic model for tourism development by considering market analysis, infrastructure, and government policies to attract more foreign tourists and boost post-pandemic economic recovery.
 
Design/methodology/approach: This study utilized a Mixed-Methods approach, Concurrent Triangulation Design, and the IFAS EFAS analysis. Data collection methods included questionnaires, interviews, focus group discussions, and observations. Quantitative data analysis involved percentage techniques, while qualitative data analysis followed Miles and Huberman's approach.
 
Findings: This study identified Asian tourists as the most promising market for tourism in the Riau Islands Province, then highlighted the need for infrastructure improvement, enhancements in government policies to support tourism development, and the formulation of an aggressive growth-focused strategic model.
 
Research, Practical & Social implications: The research compared Batam City and Bintan Island to develop post-COVID-19 tourism strategies, offering practical insights for policymakers to guide sustainable tourism development, benefiting local communities economically and socially by identifying key market opportunities and strategic directions.
 
Originality/value: The study enhances existing literature by exploring challenges and opportunities in the tourism industry post-COVID-19 and offers a unique methodological approach, combining quantitative and qualitative methods to analyze the situation comprehensively.
Evaluation of the Effect and Efficiency of Ear Tip Bloodletting Combined with Xianfang Huoming Yin in the Treatment of Early-Stage Wheals
Authors: Pang Ying
Published: March 2024

Objective: To evaluate the effect and efficiency of ear tip bloodletting combined with Xianfang Huoming Yin (XFH) in the treatment of early-stage wheals. Methods: 70 patients with early-stage wheals admitted from September 2020 to September 2022 were divided into two groups by randomized numerical table method, with 35 cases/group. Both groups received conventional treatment, the control group combined with XFH, and the observation group combined with ear tip bloodletting therapy and XFH. Conscious symptom scores, ocular indexes, therapeutic effects, and sleep quality between the two groups were compared. Results: After the treatment, the patients in the observation group had lower self- awareness symptom scores and sleep quality scores as compared to those in the control group; the diameter of the mass in the observation group was smaller than that of the control group after treatment; the average tear film rupture time and the time taken for the first non-contact tear film to rupture were longer in the observation group than those in the control group; the total effective rate of the treatment in the observation group was higher than that of the control group (P < 0.05). Conclusion: Ear tip bloodletting combined with XFH was ideal for the treatment of early-stage wheals and has a high effective rate.
Study on the Effect of Behavioral Interventions Based on the Theory of “Knowledge, Attitude, Practice” on Tuberculosis Cognitive Level of Close Contacts
Authors: Zhang Beiyan , Hu Yifei , Ji Jun , Hao Donghui , Jiao Xuehui
Published: March 2024

Objective: Based on the theory of “Knowledge, Attitude, Practice,” health education was carried out for close contact with tuberculosis (TB) at a university in Beijing, and its impact on the students’ awareness of TB was studied. This study could provide a reference for effective health education interventions among close contacts of TB in undergraduates. Methods: 102 undergraduates who had close contact with one confirmed case of pulmonary TB in April 2021 at a university were randomly divided into a control group and an intervention group. The intervention group was given the “Knowledge, Attitude, Practice” health education intervention by professionally trained doctors, and were asked to complete a self-designed TB-related questionnaire before and after the intervention. Both groups performed the Tuberculin Skin Test (TST) and chest X-ray (CR) examination. Results: The rate of the TST test was 18.6%, and CR examination showed 0 cases of pulmonary TB. The survey results showed that the TB awareness rate (96.1%, 49/51) in the intervention group was significantly higher than that of the control group (51.0%, 26/51), and the differences in awareness rate between the two groups were statistically significant (P < 0.05). Regarding the attitude/skills toward TB, the prevalence rate of tuberculosis-related attitude/behavior in the intervention group (94.1%, 47/51) was significantly higher than that of the control group (60.8%, 31/51), and the differences between the two groups were statistically significant (P < 0.05). Conclusion: Both self-controlled and parallel-controlled studies showed that the health education intervention of “Knowledge, Attitude, Practice” improved the awareness of TB among close contacts of TB in undergraduates.
Exploring the Cultural Development Path of Chinese Ancient Village under the Perspective of Rural Revitalization: Taking Zhujiayu as an Example
Authors: Zhao Jinrui
Published: March 2024

The ancient village culture contains rich social and psychological accumulation. The revitalization of culture is the core and driving force of rural revitalization, especially for the traditional settlements where people live together for generations, and where material and spiritual cultural values cannot be ignored. Cultural development can be achieved through a variety of ways. As a typical northern-style village in the Ming and Qing Dynasties and a 4A-level scenic spot for the early development of ancient village tourism, Zhujiayu in Zhangqiu, Shandong Province, has undergone a variety of cultural revitalization forms in the process of cultural and tourism integration.
Analisis Aksesbilitas dan Fasilitas Difabel di Masjid At-Taqwa Bandung
Authors: Wahyudi Lulut Tri , Wibawa Baju Arie
Published: March 2024

ABSTRAKSarana dan fasilitas difabel berperan penting dalam desain teknis, bahkan menjadi syarat Permen PU dan Perumahan Rakyat nomor 14/PRT/M/2017 tentang kemudahan bangunan  gedung. Penelitian ini akan menganalisis aksesbilitas dan fasilitas difabel pada masjid At-taqwa Bandung. Penelitian ini dilakukan secara berkala yaitu pada waktu sholat  dhuhur,  asar,  dan sholat jum’at, dengan metode wawancara dan observasi lapangan dan dilakukan mulai dari pengamatan langsung di lapangan, dengan menganalisis aksesbilitas difabel, terutama akses  masuk ke dalam masjid, sangat diperlukan ramp untuk difabel agar difabel mudah dalam mengakses masjid. Dari semua penelitian pada sarana dan fasilitas difabel masih ada yang belum memenuhi syarat Permen PU dan Perumahan Rakyat nomor 14/PRT/M/2017 tentang kemudahan bangunan gedung, yaitu tidak ada area parkir khusus difabel, tidak ada ramp untuk akses difabel, tidak ada tempat wudhu khusus difabel, tidak ada toilet khusus difabel serta ukuran tangga yang tidak sesuai persyaratan. Sehingga penyandang disabilitas tidak dapat mengakses masjid At- taqwa.Kata Kunci : Aksesbilitas dan Falitas Difabel ABSTRACT Disability facilities and facilities play an important role in technical design, and even become a requirement for Permen PU and Public Housing  number 14/PRT/M/2017 regarding  the ease of building. This study will analyze the accessibility and disabled facilities at the At- taqwa mosque in Bandung. This research is conducted periodically, namely during the midday prayer, asar, and Friday prayers, with interviews and field observations and starting from direct observation in the field, by analyzing the accessibility of the disabled, especially access to enter the mosque, it is very necessary to ramp diffable so that the diffable can  easily  access the mosque. Of all the studies on disability facilities and facilities, there are still those who do not meet the requirements of the Minister of Public Works and Public Housing number 14/PRT/M/2017 on the ease of building, that is, there is no special parking area for disabled people, there is no ramp for disabled access, there is no place special ablution for the disabled, there is no special toilet with disabilities and the size of the stairs that does not fit the requirements. So people with disabilities cannot access the At-taqwa mosque.Key Words : Accessbility and fasillity disabillity