bluuebunny/crossref_metadata_2025_split huggingface dataset:
Capacitively coupled contactless conductivity detection (C4D) of ZnO nanostructures gas sensor by adding Au:Pd metal with response to ethanol and acetone vapor
Authors: Hongsith N , Chansuriya S , Yatmontree B , Uai S 
Published: December 2023

Abstract
In this work, we present a new gas sensor detection method using the capacitively coupled contactless conductivity detection (C4D) technique. The ZnO nanostructures were prepared by the current heating technique and then added Au: Pd nanoparticles on their surface by a sputtering technique. The gas detector with a C4D system had been fabricated. A data acquisition system was designed to record the signal obtained from the detection electrode. The sensing properties of the sensor with different gas vapor concentrations and operating temperatures have been investigated. Sensitivity was defined as the ratio of signal data in air and vapor gas ambient. The results found that the signal data depend on gas concentration and temperature. However, the results showed lower sensitivity than other techniques, such as the resistive ZnO gas sensor. Finally, the gas sensing mechanism in terms of surface charge density was proposed and used to explain the sensitivity enhancement of C4D ZnO gas sensors.
In vitro studies of Cholangiocarcinoma cell lines response to X-rays and Neutron irradiation
Authors: Malad Y , Kartini D A , Karoon P , Suayod S , Waree K , Tippayamontri T , Sanghangthum T , Talubnin C , Kobdaj C 
Published: December 2023

Abstract
Cholangiocarcinoma (CCA) is an aggressive cancer that is prevalent in the northeastern part of Thailand. Surgical treatment is the gold standard for CCA treatment, but some CCA patients are inoperable. Chemotherapy and radiotherapy are alternative treatments to improve the quality of life of patients. However, the effect of radiotherapy on CCA treatment is still unclear. In this study, we aimed to investigate the effect of X-rays and neutron beams on the human CCA cell line (KKU-055). First, KKU-055 cells were irradiated using 6 MV X-rays with a dose range of 0–5 Gy at King Chulalongkorn Memorial Hospital (KCMH) to obtain reference data. Next, cells were exposed to thermal neutron beams with doses ranging from 0 to 5 Gy using the Thai Research Reactor-1/Modification 1 (TRR-1/M1) at the Thailand Institute of Nuclear Technology (TINT). After neutron irradiation, survival curves were studied, and the relative biological effectiveness (RBE) was investigated. The findings revealed that the survival rate of the KKU-055 cells under X-ray irradiation is lower than that of neutron beams. To increase neutron interaction with the DNA of CCA cell lines, we plan to introduce boron compounds to CCA cell lines prior to neutron irradiation. This technique is referred to as boron neutron capture therapy (BNCT).
Development of a 483 nm external cavity diode laser with cat-eye reflector
Authors: Rattanathammakorn P , Temnuch W , Buathong S , Deachapunya S 
Published: December 2023

Abstract
An external cavity diode laser, equipped with a cat-eye reflector setup, an interference filter, and a polarizing beam splitter, has been demonstrated to produce a laser wavelength of approximately 483 nm. This ECDL is based on the affordably priced commercial laser diode, GH04850B2G. Critical characteristics, such as fluctuations in optical power and output wavelength in response to injected current, were investigated. In anticipation of potential experiments involving rubidium Rydberg atoms, a simulation of the electromagnetically induced transparency spectrum was conducted using this laser setup in conjunction with a 780-nm laser.
Synthesis BaFe12O19/RGO Composite As Microwave Absorber For Ku-Band
Authors: Sinuhaji P , Setiadi E A , Aritonang R A 
Published: December 2023

Abstract
In this study, a composite microwave absorber consist of barium hexaferrite (BaFe12O19) and Reduced Graphene Oxide (RGO) for Ku-band (12-18 GHz) was prosperous blend. Barium hexaferrite to arrange using the sonochemical method and at calcination temperature of 1000°C and a holding time of 1 hour. Subsequently, commercial RGO was composited with barium hexaferrite at a weight percentage of 6% RGO. The synthesized composite was characterized using X-Ray Diffraction (XRD) to analyze the formed phases, Raman Spectroscopy to confirm the presence of RGO in the composite, and Vector Network Analyzer (VNA) to evaluate the microwave absorption performance. The XRD test results show that there is no change in the crystal structure of barium hexaferrite due to the addition of RGO. The VNA test results showed that the addition of RGO could enhance the reflection loss value of barium hexaferrite. The BaFe12O19/RGO compound displayed a reflection loss value of -14.43 dB at a frequence of 16.50 GHz.
Investigation of Calcination Duration on the Surface Morphology and Specific Surface Area of Zeolite-Chitosan Composite with Oil Palm Ash for Potential Water Contaminant Remediation
Authors: Suka Khairunnisa , Frida Erna , Rianna Martha , Bonardo Doli 
Published: December 2023

Abstract
This research investigates how varying calcination durations affect the surface characteristics of a Zeolite-Chitosan composite with oil palm ash, aiming to determine its water contaminant removal potential. Three different calcination durations (1, 2, and 3 hours) are studied. The synthesis involves mixing oil palm ash with Zeolite-Chitosan, followed by varying-duration calcination. Scanning electron microscopy (SEM) and surface area analysis (SAA) are used to assess surface characteristics. Initial findings indicate that changing calcination duration significantly impacts the composite’s surface features and specific surface area. Longer calcination leads to increased surface roughness and higher specific surface area. The 3-hour calcination results in the highest surface roughness and specific surface area among the durations tested. These findings suggest that calcination duration is crucial in altering the composite’s structural properties, which could affect its efficacy in adsorbing water contaminants. Ongoing research aims to better understand the relationship between calcination duration and the composite’s adsorption performance, ultimately optimizing the synthesis of the Zeolite-Chitosan composite with oil palm ash for efficient water contaminant remediation.
Effect of Urea and Chitosan Doping on Red Bean Carbon Dots as Heavy Metal Detectors
Authors: Sinuhaji Perdinan , Syahri Alfi 
Published: December 2023

Abstract
The synthesis of red bean carbon dots doped with urea and chitosan has been successfully carried out using the bottom-up method via hydrothermal technique at 200°C for 4 hours. UV-VIS characterization showed that Carbon Dots : Red Beans + NaOH had an absorbance value of 2.55, Carbon Dots : Red Beans + NaOH + Urea had an absorbance value of 1.55, while Carbon Dots :Red Beans + Urea + Chitosan had an absorbance value of 2.66. FTIR characterization shows that the Carbon Dots do not change in spectral wave number with wave numbers 3265 cm -1 to 1021 cm -1 . Microstructure of Red Beans + NaOH Carbon Dots has a spherical microstructure with a diameter of between 7-12 nm, and Red Beans + NaOH + Urea Carbon Dots has a cubical microstructure. Meanwhile, Carbon Dots from Red Beans + Urea + Chitosan have a spherical microstructure with a diameter of 6 - 9 nm. The EDX characterization shows that the Carbon Dots sample contains the elements C, O, K, Cl, Na.
Reduction of rainwater turbidity using zeolite
Authors: Wibowo Edy , Ulya Naily , Syaifullah Ilham , Surya Alam Erpanda , Rokhmat Mamat , Suwandi  , Marwoto Putut , Sutisna  
Published: December 2023

Abstract
In this work, we showed that rainwater harvesting offers a potential solution for overcoming clean water emergencies. However, rainwater that has been held for more than two months will be hazy and mossy in appearance. Rainwater must, therefore, first be treated to make it clearer. Rainwater was treated using clinoptilolite-type zeolite. We used two sizes of zeolite particles: large (0.02 cm) and small (0.002 cm). The zeolite was activated in an oven at 225 °C for 3 hours. After 50 hours of immersion, it was found that large-sized zeolite could lower the turbidity of rainwater by up to 86.2% without increasing the TDS (Total Dissolved Solids) value. Small-sized zeolite might reduce the turbidity of rainwater by 8% for the same immersion time. These findings show that larger zeolites are more efficient at reducing rainwater turbidity. Large-sized zeolite does not require any further processing to be made smaller before use because it is readily available on the market. Furthermore, it showed that the zeolite-based rainwater treatment process employs the pseudo-second-order kinetic model.
On the Mechanism Underlying the Distinct Activities of Rutile-Type Metal Oxides Toward Methane Activation
Authors: Haris Mahyuddin Muhammad , Dzaudan Naufal Farrel , Afifah Hasna 
Published: December 2023

Abstract
We report herein a density functional theory study on the C–H bond activation of CH4 over several rutile-type metal oxide catalysts, namely IrO2(110), TiO2(110), and β-MnO2(110) surfaces. We find that CH4 is strongly chemisorbed on the IrO2(110) surface, which distorts the CH4 geometry. Together with a strong thermodynamic driving force derived from the formation of Ir–CH3 bond, the H–CH3 bond activation proceeds with a negative barrier. In contrast, a weakly chemisorbed CH4 molecule on the TiO2(110) surface cannot proceed to the C–H bond cleavage due to a high activation barrier and a low thermodynamic driving force. The reaction on the β-MnO2(110) surface, on the other hand, is found to begin with a weak CH4 physisorption, followed by the C–H bond scission with a low activation barrier. However, here, the formation of •CH3 radical is more preferred than the Mn–CH3 bond formation, most possibly due to the electrophilic nature of MnO that suitably renders the catalyst as a perfect electron acceptor for the H-atom abstraction of CH4. With such low barrier and stability of the •CH3 formation, we suggest β-MnO2(110) as a potential catalyst that is good not only for the H–CH3 bond activation but also for the methanol formation.
Optimization of Calcination Temperature to Synthesis ZnO Nanostructures as Photocatalyst Using Pineapple as Chelating Agent
Authors: Ismardi Abrar , Wahyudhin Fathona Indra , Nur Rezky Anisa , Hakimin Abdullah Nor , Prastika Aurisa , Fahlevi Ali Rafsanjani Mukhammad , Ashila Farikha Mayundri Siti , Deviyana Gunawan Theresia 
Published: December 2023

Abstract
ZnO nanostructures were successfully synthesized using the sol-gel method with pineapple extract (Ananas comosus (L.)) as a chelating agent. ZnO nanostructures using cayenne pineapple (Ananas comosus var.cayenne) chelate were calcined at temperatures ranging from 500 ˚C to 900 ˚C, while queen pineapple (Ananas comosus var.queen) was calcined at 700 ˚C and 800 ˚C. ZnO nanostructures synthesized with cayenne pineapple chelate and calcinated at 800 ˚C showed an average particle size of 1.858 μm and an average crystallite size of 35.10 nm, while at 700 ˚C, it was 30.90 nm. The diffraction peaks can be indexed as a hexagonal wurtzite structure (a = 3.25x10−10 m, c = 5.21x10−10 m). The photocatalytic activity of ZnO was evaluated for the photodegradation of methylene blue under UV light radiation. The most effective degradation was achieved with ZnO nanostructures synthesized with cayenne pineapple chelate at a calcination temperature of 700 ˚C under UV light irradiation for 240 minutes. The degradation rate was 55.87% at a concentration of 10 ppm MB solution.
Development of formalin detection system on wet noodles and tengkawang seed fat (shorea sp.) as a natural preservative solution
Authors: Rosdiana E , Kusumaningtyas V A , Sitorus A A , Raihan M , Firmansyah G A , Purbowati E , Andini R I 
Published: December 2023

Abstract
The emergence of public anxiety about the durability of foods containing preservatives or synthetic substances that are harmful to the human body is already very worrying. Some traders who understand the dangers of synthetic preservatives in food, prefer to use natural food preservatives. However, few traders also use formalin as a preservative in their food products, where formalin is commonly used to preserve corpses and kill germs. For this reason, a formalin content detection system has been developed as a synthetic preservative and tengkawang seed fat (Shorea.sp) as a natural preservative using filter paper as a test medium. The detection results that have been carried out obtained a tool accuracy of 96.25%. Spectrophotometric tests are performed to validate the designed tool. From the results of characterization using a spectrophotometer, the average ppm price is half times different from the ppm calculation results mathematically. This is because at the time of filtration, there are remnants of formalin content that are not carried into the filtrate. In addition, it was also obtained from the results of observations where wet noodles containing tengkawang seed fat (Shorea.sp) can last for 3 days at room temperature (25 ̊C).
Evaluating the Impact of Biocomposite Brick Materials on The OTTV and Diverse Thermal Characteristics of Rooms in Residential Buildings
Authors: Putra D A , Ichwania C , Utami A R I , Abdullah A H D , Suwandi  , Gunawan A N S 
Published: December 2023

Abstract
The development of biocomposite materials for building purposes, including their incorporation in bricks, has gained momentum. Bricks are extensively utilized in residential buildings in Indonesia, making their performance a critical factor. To ensure building performance meets certain standards, Indonesia adheres to SNI 6389:2011, which mandates compliance with the Overall Thermal Transfer Value (OTTV) before construction commences. This study aims to examine the impact of using biocomposite bricks on the OTTV value. Additionally, it investigates the effects on various thermal properties of the room, such as humidity, air temperature, operative temperature, and Mean Radiant Temperature (MRT), which serve as indicators for assessing thermal comfort. The findings demonstrate that the use of biocomposite bricks can reduce the OTTV value by approximately 7.9% - 10.2%. However, there is no significant alteration observed in the physical properties of the room when compared to conventional bricks. As a result, it can be inferred that the use of biocomposite bricks holds promise for further progress in enhancing energy efficiency and addressing environmental concerns.
Potential Development and Economic Analysis of Bioethanol Fabrication Design from Oil Palm Biomass with Ionic Liquid Choline Acetate Using SuperPro Designer (SPD) Software
Authors: Erawan F , Utami A R I , Sugiwati S , Maryana R , Mel M , Darus L 
Published: December 2023

Abstract
The increasing use of energy causes the availability of energy, especially in Indonesia, to be depleted. This condition encourages humans to develop renewable energy sources, one of which is bioethanol, with the availability of abundant raw materials in nature. However, the development of bioethanol is still ineffective because it requires a long time and has high costs. Therefore, a design for bioethanol fabrication from oil palm plantation products with ionic liquid pretreatment using SuperPro Designer (SPD) software was developed. The bioethanol production process was simulated through three stages: pretreatment, enzymatic saccharification, and fermentation. Pretreatment was carried out using the ionic liquid Choline Acetate, after which the results of saccharification and fermentation were analyzed. The results of saccharification showed that around 138 g/L of palm oil was converted into sugar for fermentation. The overall result of the simulation system is that the fermentation process for 12 hours produced 92 g/L ethanol or 96% of the theoretical yield. Meanwhile, ethanol production through fabrication for energy can reduce ethanol prices by 30% from their initial price. This ethanol fabrication design is very supportive of optimizing biomass into bioethanol. Therefore, this design can be used as a recommendation for economical bioethanol production to obtain optimal results in bioethanol production.
Simple Data Transfer Over Audio Using Smart Phones
Authors: Fade A R , Suprayogi  , Azmi F , Sutari W 
Published: December 2023

Abstract
The use of systems such as RFID, Barcode, NFC, etc. which are already widely used requires special tools which required additional costs and if only needed in low-level conditions it will be redundant. In addition, the need for internet on the system has problems in the form of data security. There is also the problem of the limitation of a very small distance to measure and even for use of RFID and NFC the device must be attached to work. So, the use of audio-based data transfer (DTOA) will be more efficient because it is enough to use a smartphone without having to add more devices and is suitable for low-cost usage. Also, use that can be done offline can provide solutions for better data security. In addition, the use of DTOA is based on wave audio which allows the system to be able to perform the system at a longer distance (indoors). For manufacturing, the sending smartphone tester will send a binary set which will be converted to audio and received by the receiving smartphone and the audio will be converted back into a binary set.
Spatial-temporal forest canopy density in Indonesia’s new capital city and its surrounding area
Authors: Adinugroho Wahyu Catur , Prasetyo Lilik Budi , Kusmana Cecep , Krisnawati Haruni 
Published: December 2023

Abstract
Monitoring the condition of the forest in Indonesia’s New Capital City, Nusantara (IKN), and the surrounding area as a buffer is crucial to realizing the Forest City concept. Forest canopy density can be used to understand and measure forest conditions using satellite imagery efficiently. The main objective of this study was to investigate the spatial-temporal dynamic alterations of forest canopy density across IKN and its buffer. Forest canopy density is based on Landsat 8 imagery for 2015-2020, processed in the cloud using the Google Earth Engine (GEE) and compared using a hemispherical photograph and LiDAR. Google Earth Engine is powerful for creating forest canopy density maps, although Canopy density from Landsat 8 tends to be lower than hemispherical and Lidar, so a correction factor is needed. The correlation between forest canopy density and hemispherical photography can provide valuable insights into the structure and composition of a forest ecosystem. For land types covered with forest, consistently in 2015 and 2020, it dominates dense forest canopy density (>60%). The forest area in the IKN and its surroundings experienced a decrease in forest canopy density by logging. In contrast, some areas experienced increased forest canopy density representing disturbed forest growth.
Screening potential hyperaccumulator plant for phytoremediation approach due to ASGM Activity: Study case of Katingan Regency and Tanggamus Regency
Authors: Prasetia Hendra , Fasya Muhammad Rizki Firdaus , Astuti Widi , Mufakhir Fika Rofiek , Sumardi Slamet , Gunawan Pratama Yoga R. , Asmarahman Ceng , Damayanti Inggar , Haryono Tri , Darusman Taryono , Lestari Dwi Puji , Arriyadi Desra 
Published: December 2023

Abstract
Artisanal and Small Scale-Gold Mining (ASGM) is one of the anthropogenic activity of heavy metal contaminations sources and indicated high negative impact on the environment, especially the mercury (Hg) contaminations. The aim of this research was screened potential plants that can be used as remediation agents due to ASGM activity in the post-mining area. This study was conducted in Katingan Regency, Central Kalimantan and at PT Napal Umbar Picung (NUP), Tanggamus Regency, Lampung. The study collected the potential hyperaccumulator plant from contaminated areas. Plant samples were dried at 80ºC for 3 days in a ventilated oven. The powder samples were weighed and dissolved with 6 ml of HNO3. Then, samples were digested using a Multiwave 7,000. Dissolved samples were analyzed using X-Ray Fluorescence (XRF).The highest concentrations of As, Fe, Hg, Pb, and Zn in the shoots of ASGM in Katingan Regency were 90 mg/kg, 9,837 mg/kg, 1,023 mg/kg, 114 mg/kg, and 315 mg/kg, respectively. The analysis results of highest concentrations of As, Fe, Hg, Pb, and Zn in the shoots of PT NUP were 97.2 mg/kg, 15,4710 mg/kg, 162.9 mg/kg, 152.4, and 1,220 mg/kg, respectively. The results showed that the hyperaccumulators plant of Hg were Christella sp., Hoya sp., Stenochlaena sp., Athyrium sp., Palhinhaea sp., and Pecluma sp in both ASGM area, Katingan and PT NUP. This study can be concluded that the plants can be used as phytoremediation approach of heavy metals contamination such as As, Fe, Pb, Zn, and especially Hg.
Healing forests as potential natural resources for visitor health therapy in the post-pandemic period
Authors: Kurniasari DR , Wibowo LR , Seraphine N , Kurniawan AS 
Published: December 2023

Abstract
The COVID-19 pandemic has shocked people all over the world, including Indonesia. Various impacts have been felt due to the pandemic, including the many lives lost, obstacles to economic activity, limited community activities in general, to a decline in national tourism activities. The space for people to move at that time was limited, especially when they were infected with COVID-19. This study aims to identify the benefits of forests to improve public health recovery post-pandemic. Data collection was carried out in February-June 2023 by literature review and was analyzed qualitatively. Indonesia has successfully passed COVID-19 since December 2022, while health protocols are still being implemented. After going through a difficult period, people need health therapy to face their activities properly. The benefit of forests from environmental services in several countries is considered capable of being an alternative to increasing people’s enthusiasm with health therapy through healing forests. Many ecotourism activists in Central Java offered tourism services for beautiful landscapes, kind of waterfalls, mountainous landscapes, and the serenity of forests. Visitors welcome the opportunity to enjoy beautiful natural offerings and soothe the soul. It is in line with the high demand of ecotourism spots post pandemic, which form a close relationship between the triple bottom line from an ecological, social, and economic standpoint toward the environment sustainable development.
Alpha diversity of planktonic organisms across stream networks associated with mining activities in Southeast Sulawesi
Authors: Nasaruddin N , Usman I , Firdaus  , Suriana  , Abriansyah  , Hasni  , Fitriani  
Published: December 2023

Abstract
Planktonic organisms are the main biotic components of the food chain of aquatic ecosystems. Little is known about the impact of multiple stressors on plankton community response in mining areas. This study aimed to elucidate the alpha diversity of zooplankton and phytoplankton in different stream networks associated with mining activities in the Molore watershed, Southeast Sulawesi. The research was carried out by taking samples for water quality and plankton analyses in four streams in November 2021 and November 2022. A rarefaction curve approach was used to assess the species richness and diversity trends of the region. Streams were clustered using the Bray-Curtis similarity index of alpha diversity indices, such as the Shannon-Wiener, Simpson, Margalef, Pielou, and Berger-Parker indices. We found six species of zooplankton only in three sites and 21 species of Phytoplankton in the class of Bacillariophyceae, Chlorophyceae, Cyanophyceae, Dinophyceae, and Euglenophyceae across the landscape gradient. The present study showed that the lowest value of the Shannon-Wiener diversity of the plankton community was 0.48, while the maximum expected value based on individuals’ rarefaction curve was 2.24. Species richness is in line with cluster analysis, which shows the similarity of stream groups according to the level of environmental pressure, indicating a valuable ecological indicator for stream management.