bluuebunny/crossref_metadata_2025 huggingface dataset:
The Capability Test Of Rice Husk (Oryza sativa L) As Active Carbon For Phenol Adsorption
Authors: Tanasale Matheis F.J.D.P. , Latupeirissa Jolantje , Tuhalauruw Eltha
Published: August 2024

The utilization study of active carbon from rice husk as adsorbent has been done. Active carbon is gained through carbonization process where rice husk put into furnace on temperature 300 oC. for 1 hour, colded, and sieved by sieve 100 mesh. The next it is activated by KOH solution with a concentration of 50% for 5 hours. The characterization used X-ray diffraction (XRD) for both carbons before and after activation. And determinated anidity weigh, calsinated in furnace with 400 oC. and streamed through N2 gas for 2 hours. Acidity weight of 6.4873 x 10-2 and 2.5467 x 10-2 mol/g, respectively. Determination of phenol adsorption was the UV-Vis spectrophotometry. Adsorption phenol from active carbon was followed the Freundlich isotherm with maximum capacity 5.6964 x 10-2 mg/g and n value is 0.2586 mg/g. The experimental data fitted well to the pseudo second-order kinetic model, which regretion value is 99.9 % and rate constant reaction (k) value is 0.74 g mg-1 menit-1 Phenol adsorption from active carbon rice husk the best is consentration 100 ppm with value 99.56 %.
Preparation and Characterization Ni-Mo/Montmorillonite As A Catalyst In Cracking Process
Authors: Sopiarini Putri , Firdaus Firdaus , Taba Paulina
Published: August 2024

This research is aims to prepare and characterization of montmorillonite intercalated Ni-Mo as a catalyst in the cracking process. Preparation is do by extracting monmorillonite of bentonite by decantation method. Monmorillonite synthesized with NaCl to obtain Na-monmorillonite. Ni-Mo/monmorillonite obtained by dissolving ammonium hepta molybdate (NH4)6Mo7O24.4H2O) with distilled water and refluxed with Na-monmorillonite for 6 hours and dried at a temperature of 120oC. Furthermore, nickel nitrate hexahydrate (Ni(NO3)2.6H2O) is dissolved in distilled water and refluxed with Mo-monmorillonite for 6 hours and dried at a temperature of 120oC. Ni-Mo/monmorillonite obtained is then calcined at a temperature of 600oC for 4 hours to activate and eliminate the remnants of organic materials. Characterization of Ni-Mo/monmorillonite do by XRD, XRF and SEM. Characterization by XRD showing the change in the content of monmorillonite, Na-monmorillonite, and Ni-Mo/monmorillonite. Characterization by XRF confirms the success of the creators do with increasing metal content of Ni and Mo in monmorillonite replace the position of the metal Na. Characterization by SEM showed highly significant differences in morphology of montmorillonite, Na-monmorillonite and Ni-Mo-monmorillonite
Karakterisasi Karbon Dari Tempurung Kemiri (Aleurites Moluccana (L) Willd) Dengan Alat XRD
Authors: Latupeirissa Jola , Tanasale Matheis F.J.D.P. , Dade Kalam
Published: August 2024

The research of carbon characterization from candlenut shells before and after activation has been done. Activated carbon were obtained through the heating process at 350 Â°C for 2 hours. The carbon charcoal were further cooled and sieved with a 100 mesh sieve. Then, calcinated at 450 Â°C and nitrogen (N2) were flowed for 2 hours and characterized by XRD for carbon before activation. Carbon was activated by using KOH solution with a concentration of 50% for 5 hours, then dried in an oven at 120 Â°C for 1 hour and characterized. XRD diffractogram of crystallization for carbon before activation produced three main peak were 2.93 Ã…, 3.25 Ã…, and 8.26 Ã…, and at 2Ó¨ region of 30.47Â°, 27.40Â°, and 10.70Â°, respectively. XRD diffractogram of crystallization for activated carbon produced three main peak were 3.0195 Ã…, 3.3383 Ã… and 8.0955 Ã…, the 2Ó¨ value which was shifted of  29.560Â°, 26.682Â°, and 10.920Â°. This shift indicates that the distance difference between charcoal crystal face caused by KOH activator. Weight acidity solids before and after activation was 27.370 x10-3 and 33.1245x10-3 mol.g-1, respectively.
Produksi Oligomer Kitosan dari Limbah Udang Windu (Panaeus monodon) Menggunakan Enzim Kitosanase dari Isolat Bakteri Klebsiella sp.
Authors: Sarni Sarni , Natsir Hasnah , Dali Seniwati
Published: August 2024

Chitosan is a biopolymer that is the main content of D-glucosamine and several parts of N-acetyl-D-glucosamine bound to Î²- (1-4) glucoside. Chitosan receive special attention as functional biopolymers for applications in various fields. Chitosan is more effectively absorbed into the human body when it gets converted into chitosan oligomer form. Chitosan oligomer is a mixture of oligomers of D-glucosamine  are formed through a process of severing ties depolymerization of chitosan with Î²-glycosidic. This study aims to produce chitosan oligomer of waste tiger shrimp (Penaeus monodon) using enzyme kitosanase of bacteria Klebsiella sp. Chitosan oligomer produced by using the enzyme chitosanase at a temperature of 40 Â°C and pH 8 with the activity of 0.309 U/mL (5,235 U/mg) obtained in the form of a mixture of monomer to octamer, which  soluble in acetic acid 0.25% to 0.5%, having intrinsic viscosity decreases with increasing time of incubation is 0.195 (1 hour incubation); 0.9 (incubation 2 hours) and 0.7 (incubation 3 hours) with molecular weight range of 4103.12 g/mol (incubation 1 hour) ; 1483.48 g/mol (incubation 2 hours) and 1065.79 g/mol (incubation 3 hours).
Pengaruh Konsentrasi AgNO3 dan Suhu Sintesis terhadap Surface Plasmon Resonance (SPR) Nanopartikel Perak
Authors: R Irwan , Zakir Muhammad , Budi Prastawa
Published: August 2024

The research aims to synthesis of silver nanoparticles (AgNPs) via bio-reduction method using mangosteen skin extract. The growth of AgNPs was characterized by ultraviolet-visible spectroscopy (UV-Vis). Based on Surface Plasmon resonance (SPR) data, observation suggested that an increase of initial AgNO3 concentration along with temperature, had affected its surface Plasmon resonance trend. SPR absorption indicates that the concentration of AgNO3 and the synthesis temperature was instrumental in the formation of silver nanoparticles.
Sintesis Turunan Amida N-4-O-Asetilferuloilmorfolina dari Asam Ferulat Melalui Metode Konversi Tidak Langsung
Authors: Sumarna Sabir , Firdaus Firdaus , Soekamto Nunuk H.
Published: August 2024

Synthesis of N-4-O-asetilferuloylmorpholine from ferulic acid via indirect conversion methods with acetylation, chlorination and amidation (in situ) reactions have been conducted. The acetylation was carried out using acetic anhydride reagent in pyridine solvent at room temperature for 6 hours. The chlorination was performed with thionyl chloride in benzene solvent by reflux at 75Â°C for 4 hours, proceeded by in situ amidation utilizing morpholine in the presence of triethylamine and pyridine using dichloromethane solvent at room temperature. The target molecule as white crystalline solids with m.p. of 91-92Â°C. Characterization of these compounds was committed by FTIR spectrophotometry.
Minyak Biji Nyamplung (Calophyllum inophyllum) Dengan Etanol
Authors: Rezki Rezki , Musta Rustam , Haetami Aceng
Published: August 2024

A study has been conducted on the transesterification of Calophyllum innophyllum seed oil with ethanol. The purpose of this research is to determine the comparison of concentration of phosphoric acid used to remove the gum on the oil, ester content is produced in the process of transesterification with ethanol, the ester yield obtained after the final stage of the transesterification process, the viscosity of the biodiesel produced, moisture content of biodiesel is produced, and density of biodiesel was produced. This research is taken based on consideration production biodiesel by direct transesterification process. Based on research result of good phosphoric acid concentration used to remove oil gum is 85%, volume of biodiesel produced at transesterification equal to 150 mL with yield 80,89%, biodiesel quality parameter measured that viscosity = 0,05 mm2 / s not fulfill Indonesian National Standart (INS), moisture content = 0.045 meets the INS and the density = 0.881 g / cm3 meets the INS
Analisis Kadar Sianida Pada Rebung Berdasarkan Volume Ukuran Dari Kecamatan Bajeng Kabupaten Gowa
Authors: Arisanti Dewi , Rasyid Nur Qadri , Nasir Muh.
Published: August 2024

Bamboo shoots are young shoots from bamboo Terubus. Bamboo shoots contain cyanide if consumed can cause shortness of breath, decreased blood pressure, rapid pulse, headache, nausea, diarrhea, mental disorders and seizures. Continuous consumption with low doses causes mumps and dwarfism and neurological diseases. This study aims to determine how much cyanide levels in bamboo shoots and this type of research is a descriptive laboratory experiment. The sample used in this study were 3 samples based on the size of the volume. The sampling technique is by means of purposive sampling that is looking at the criteria based on large, medium and small size types. Analysis of cyanide levels was obtained by UV-Vis Spectrophotometer with a wavelength of 582 nm. The results showed that large size bamboo shoots were height = 27 cm; diameter = 16 cm has a cyanide content of 21.84 mg/kg, medium size were height = 18 cm; diameter = 7 cm has a cyanide content of 18.40 mg / kg and a small size of height = 8 cm; diameter = 4 cm has cyanide content of 4.65 mg/kg. Thus it can be concluded that the greater the size of bamboo shoots have height level of cyanide.
Pengaruh Pemanasan Terhadap Kristalinitas Dan Parameter Kisi Nanokomposit Silika-Zirkonia Montmorillonit K10 Dan Silika-Besi Oksida Montmorillonit K10
Authors: Sekewael Serly J. , Wijaya Karna , . Triyono
Published: August 2024

The thermal treatment of the silica-zirconia montmorillonite K10 and silica-ferri oxide montmorillonite K10 nanocomposites at 300 and 500 Â°C has been carried out, respectively as part of a study of their function as the catalyst. The heating effect on the crystallinity and the lattice parameter calculation of both nanocomposites was studied using XRD and FTIR instruments. The results showed that the nanocomposite silica-zirconia montmorillonite K10 has a thermal resistance and the crystallinity better than the silica-ferri oxide montmorillonite K10, and both have values varying lattice parameters.
Perbandingan Sifat Feroelektrik Pada Sintesis Oksida Logam Aurivillius SrBi4Ti4O15 Empat Lapis Dengan Metode Hidrotermal
Authors: Karnelasatri Karnelasatri , Mikrianto Edi
Published: August 2024

Aurivillius compounds, SrBi4Ti4O15 (SBT four layers) have been synthesized by hydrothermal method at 200â„ƒ with variation of times 48 hours, 72 hours and 96 hours. Single phase of SrBi4Ti4O15 Aurivillius compounds obtained at the 200 Ëš C, 96 hours and the concentration of NaOH 3M. The Rietica program shown the index Miller result is 1 1 5 1 1 3, 0 2 0, 0 2 4, 2 0 8 2 2 0, 0 2 1 0, 3 1 6, 1 1 1 6 and the space group is A21am with the orthorhombic crystal system. Cell parameters are a = 5.5754 Ã…, b = 5.5456 Ã…, c = 41.3642. Ferroelectric properties show the value of remanent polarization Pr (+) and Pr (-) 4,61 C/cm2 and 2,75 C/cm2 and that is much lower than the value of remanent polarization of other material that have been synthesized at 240â„ƒ, 72 hours with the same method.
Ekstraksi Dan Karakterisasi Pektin Kulit Jeruk Manis Kisar (Citrus sp.)
Authors: Latupeirissa Jolantje , Fransina Eirene G. , Tanasale Matheis F.J.D.P.
Published: August 2024

Extraction and characterization of pectin from the oranges peel of kisar (Citrus sp.) have been done. Pectin was obtained from extraction oranges peel crust of kisar with HCl at temperature 90 Â°C during 4 hours. The content of albido and pectin are 69.17% and 82.82%, respectively. Identification functional group of pectin was using by FTIR spectrophotometer which OH-alcohol (3294.42â€“3373.50 cm-1), CH3-alifatic (2939.52 cm-1), C=O ester (1741.72â€“1730.15 cm-1), C=C alkene (1614.42â€“1643.35 cm-1), and C-O eter (1232.51â€“1276.88 cm-1).  Characterizations of pectin were equivalent weight (2011.6 mg), methoxyl content (1.17%), galacturonic level (41.64%), moisture content (28.46%), ash content (11.92%), and degree of esterification (15.95%).
Uji Aktivitas Antioksidan Ekstrak Metanol Biji Kesumba Keling (Bixa orellana L)
Authors: Souhoka Fensia Analda , Hattu Nikmans , Huliselan Marsye
Published: August 2024

Kesumba keling (Bixa orellana L) has been widely used as a natural dye on lips, hair, and cloth. The red pigment in kesumba keling seeds comes from a bixin and norbixin compound which have many conjugated double bonds, so it has the potential of antioxidants. This study aims to determine the antioxidant compound and an antioxidant activity of methanol extract of kesumba keling seeds. The moisture content of kesumba keling seeds is 78.74%. The powder of kesumba keling seeds was extracted using maceration method with 80% of methanol. Phytochemical test results of methanol extract positively contained flavonoid compound. An antioxidant activity test of methanol extract of kesumba keling seeds was carried out by determining DPPH free radical deterrent activity. The absorbance measurement were made using a UV-Vis spectrophotometer at a wavelength of 517 nm. Kesumba keling seeds extract has antioxidant activity which is indicated by IC50 value of 69.425 ppm, so it is classified as a strong antioxidant.
Sintesis Nanopartikel Perak Menggunakan Ekstrak Daun Salam (Syzygium polyanthum) Sebagai Bioreduktor Dan Uji Aktivitasnya Sebagai Antioksidan
Authors: Taba Paulina , Parmitha Nadya Yuli , Kasim Syahruddin
Published: August 2024

Silver nanoparticles have been synthesized by the reduction method using salam leaf extract (Syzygium polyanthum) as a reducing agent. The silver nanoparticles produced were then tested for their activity as antioxidants. The formation of silver nanoparticles was carried out by adding the leaf extract into the solution of AgNO3 and homogenized using a magnetic stirrer. A UV-Vis spectrophotometer was used to confirm the formation of silver nanoparticles. Particle Size Analyzer (PSA), Scanning Electron Microscope (SEM), X-Ray Diffractometer (XRD) and Fourir Transform Infra Red (FTIR) spectrometers were used to characterize the nanoparticles produced before being tested for antioxidant activity. The results showed that the absorbance value increased with increasing reaction contact time. The maximum uptake was obtained at wavelengths of 432-446 nm using a UV-Vis spectrophotometer. The particle size was determined using a PSA with an average particle size distribution of 45.7 nm. The average diameter of silver nanoparticles was 10.06 â€“ 13.97 nm and the silver nanoparticles had rod-shapes. Functional groups that play a role in the synthesis of nanoparticles were â€“OH, â€“C=O, and â€“C-O groups. Silver nanoparticles inhibited free radicals as antioxidants with the IC50 value of 582.7 ppm.
Distribusi Kandungan Logam Berat Pb dan Cd pada Sedimen Sepanjang Muara Sungai dan Laut Perairan Spermonde, Sulawesi Selatan, Indonesia
Authors: Rustiah Waode , Noor Alfian , Maming Maming , Lukman Muhammad , Nurfadillah Nurfadillah
Published: August 2024

The determination of lead (Pb) and cadmium (Cd) levels in sediment samples in Spermonde waters has been determined. Sampling was carried out in river and sea estuary waters. The method used in the analysis of Pb and Cd is the one specified by SNI 06-6992.3-2004 and SNI 06-6992.4-2004. Based on the Decree of the Minister of Environment No. 51 of 2004, the general condition of Spermonde waters still supports the activities of marine organisms. The results showed that Spermonde waters received more Pb metal input than Cd metal. Pb metal content in river estuary and sea waters averaged 17.38 ppm. The highest Pb metal content is found in Lanjukang Island and Bone Tambung Island, each ranging from 20.88 ppm and 20.19 ppm. Meanwhile, the lowest Pb metal content on Barang Lompo island was 9.86 ppm. The detected metal content of Cd is only found in the Barrang Lompo and Kondong islands of Bali, each ranging from 1.04 ppm and 0.19 ppm, while the other locations Cd metal are undetectable. Based on the SQG value, the content of Pb and Cd in sediments in Spermonde waters is still in the standard range for sediment that has not been contaminated.
Potensi Antibakteri Ekstrak Daging Buah Kelubi (Eleiodoxa conferta) Bangka Belitung Menggunakan Microwave-Assisted Extraction (MAE)
Authors: Surtina Surtina , Sari Ratih Puspita , Zulita Zulita , Rani Rani , Roanisca Occa , Mahardika Robby Gus
Published: August 2024

Antibacterial tests were carried out using ethanol extract of kelubi meat (Eleidoxa conferta), extraction using the Microwave-Assisted Extraction method with a ratio of 2: 20 for 30 minutes at 60 Â°C. Antibacterial tests using diffusion methods with concentrations of 20%, 40%, 60%, 80%, and 100%; positive control of 0.005% amoxillin and DMSO negative control. Antibacterial test results showed that the inhibition zone of ethanol extract in E. coli bacteria with a concentration of 20% was in the moderate category, for a concentration of 40% including the strong category while the concentration of 60%, 80% and 100% was very strong. The inhibition zone of ethanol extract for the S. aureus bacterium with a concentration of 20% is included in the strong category while the concentration of 40%, 60%, 80%, and 100% is categorized as very strong. From these results it can be concluded that the inhibitory zone in Stapylococcus aureus bacteria is greater than that of E. coli bacteria.
Isoterm Adsorpsi Ion Cr(III) Oleh Kitosan Hasil Isolasi Limbah Kepiting Rajungan dan Kitosan Komersil
Authors: Rahayu Rahayu , Tanasale Matheis F.J.D.P. , Bandjar Adriani
Published: August 2024

The chitin isolation from crab Rajungan (Portunus sanginolentus) and commercial chitin was done. The chitosan was made by deasetilation of chitin using alkaline solution with addition NaBH4. The chitin and chitosan were identified by related instrument. The identification by adsorption Cr(III) ion on chitosan was done by the Atomic Absorption Spectrofotometry. The result of the chitosan isolation was fitted to the Freundlisch isotherm, with KF = 1.18673 mg/g and 1/n= 0.2712.
Perbandingan Kemampuan Aerasi Sembur (Spray) dengan Metode Adsorpsi Menggunakan Adsorben Serbuk Kulit Buah Kakao untuk Menurunkan Kadar Besi dan Mangan Pada Air Sumur Gali
Authors: Harimu La , Haetami Aceng , Sari Citra Purnama , Haeruddin Haeruddin , Nurlansi Nurlansi
Published: August 2024

Research on the use of the spray aeration method with adsorption of cocoa rind powder to reduce iron and manganese levels in dug well water has been carried out. This study aims to make comparisons from two methods to reduce iron and manganese in dug well water. The parameters optimized in this study are the aeration time and the variation of the addition of the adsorbent mass and the adsorption time. Based on the research results, the spray aeration time for 2 hours gave the optimal percentage reduction for Fe3+ and Mn4+ metal ions, namely 98.68% and 94.22%. Meanwhile, for adsorption using cocoa pod husk powder, the optimal reduction occurred in the adsorbent mass of 0.2 grams and the adsorption time of 60 minutes for iron and manganese 96.36% and 95.15%, respectively.
Pemilihan Metode Perhitungan Kimia Komputasi Semi-empiris untuk Pengembangan 1,3,4-Thiadiazole
Authors: Paramita Sari , Permata S. Maylani , Vaulina Y.D. Eva , Nasrokhah Nasrokhah , Iswanto Ponco
Published: August 2024

Computational chemistry methods are those used to help researchers design chemical compounds optimally, so that experiments and mistakes do not need to be done in the laboratory. This is a very important step because it can save costs, chemicals, and also the time spent. The method used in this study is semi-empirical, while the parameters used in this study are the infrared (IR) spectrum and the core magnetic resonance (NMR) spectrum which will be matched with the results of the study. The compound to be investigated is 1,3,4-Thiadiazole is a heterocyclic compound which is very useful in the field of medicines which contain anti-inflammatory, anticancer, glaucoma drugs etc. The results showed the most appropriate calculation method is PM3 based on infrared variation values of 1697.44 and the PRESS value of nuclear magnetic resonance variation of 21.170.
Analisis Kualitas Nata De Corn Dari Ekstrak Jagung Kuning Muda Dengan Variasi Lama Fermentasi
Authors: Sulistiyana Sulistiyana
Published: August 2024

In this research, nata de corn has been made from the young corn extract by Acetobacter xylinum. This research aims to make nata de corn with the variation of fermentation days and analyze the quality of nata de corn have been done. Fermentation days have been varied to look for the optimum conditions to obtain maximum quality. The variation of fermentation days was 11, 12, 13, and 14 days. Mass of young corn as substrate was 150 g/L solution. Then, Substrate was fermented using Acetobacter xylinum. The result of fermentation proses was called nata de corn. The nata de corn has been analyzed to obtain maximum % yield, water, and fibre content. The maximum % yield, water and fibre content were 46.82%, 93.13%, and 1.3%. This values in according to the standard quality of nata INS No.01-4317-1996.
Dinamika Reaktor Katalitik Aliran Bolak-Balik untuk Oksidasi Emisi Gas Metana
Authors: Budhi Yogi Wibisono , Rimbuala Hans Gunawan , Wibisono Andhika Feri
Published: August 2024

The performance of a reverse flow reactor (RFR) is strongly influenced by the switching time used to alternate the flow direction. This research aimed to study the effect of the switching time on reactor dynamics including the heat propagation along the bed and reaction rate in the oxidation methane for low concentration using catalytic reverse flow reactor. The experimental results show that the reverse flow operating mode can influence heat propagation along the reactor and reaction conversion. Based on the three switching times was tested, the temperature dynamics formed were in the sliding regime. The effect of switching time on RFR on conversion is very significant. When compared to steady operation, RFR operation provides the highest conversion at smaller switching times. At large switching times, the effect of reversal of flow direction becomes less dominant and reactor behavior approaches steady state.
Synthesis of Glucopyranosyl Acetic from Sago Flour as Raw Material for the Synthetic Polymers
Authors: Dali Arniah , Dali Nasriadi , Dali Seniwati , Amalia Hilda Ayu Melvi
Published: August 2024

Synthesis of glucopyranosyl acetic from sago flour as raw material for the synthetic polymers has been successfully carried out. The synthesis product is obtained through two reaction stages, namely the hydrolysis and esterification reactions. Sago flour is hydrolyzed with 25% HCl and neutralized with 45% NaOH. Glucose hydrolysis of sago starch and acetic anhydride was esterified using a zinc chloride catalyst. Synthesis product was obtained as a white solid substance (57.31% recovery), a melting point of 110 - 111oC, and Rf 0.79 on TLC (SiO2, n-hexane: ethyl acetate = 9:1 v/v). The results of the analysis of synthesis products with FTIR and GC-MS spectrometers showed that the synthesis product was glucopyranosyl acetic or 2,3,4,6-tetra-O-acetyl glucopyranose.
Mesoporous Silica MCM-48 as Chloramphenicol Adsorbent
Authors: Taba Paulina , Jannah Miftahul , Hala Yusafir
Published: August 2024

This study is aimed to determine the potential use of MCM-48 to adsorb chloramphenicol pollution. Chloramphenicol adsorption was conducted at various times contact and concentration. Adsorption isotherm was studied by comparing Langmuir and Freundlich adsorption isotherm. The results showed that chloramphenicol adsorption was suited to Freundlich isotherm with an optimum contact time of 80 minutes
Study of UiO-66 and UiO-66 Modulated with Acetic Acid as the Adsorbent for Eriochrome Black T Dye
Authors: Pambudi M. Anugrah Rizky , Prayogo Nanda , Nadjib Muhammad , Ediati Ratna
Published: August 2024

UiO-66, as one of the metal-organic framework (MOF) compounds, has been used to treat some anionic and cationic dye waste. In order to determine the adsorption selectivity decisively, the synthesis of UiO-66 and UiO-66 modulated with acetic acid had been carried out, along with their adsorption tests for Eriochrome Black T (EBT) dye solution. The synthesis was performed by utilizing a solvothermal method with the reaction mixtures of zirconium (IV) chloride (ZrCl4) and terephthalic acid (H2BDC) as a ligand heated at 120 oC for 24 hours. Both UiO-66 (without acetic acid) and acetic acid modulated UiO-66 were obtained as a white powder. Acetic acid as a modulator was added and being investigated for the adsorption capability compared to the normal UiO-66. This study showed that normal UiO-66 exhibited better adsorption than acetic acid modulated UiO-66 with a mmol ratio of acetic acid:ligand varied from 50:1, 100:1, and 150:1. Acetic acid modulated UiO-66 with a mmol ratio of 50 exhibited the best crystallinity as observed by using x-ray diffraction. It can be concluded that the adsorption of EBT using normal and acetic acid modulated UiO-66 obeyed the pseudo-second-order reaction rate law as well as the Langmuir adsorption isotherm pattern.
Bioaccumulated Mercury by Several Types of Plants in Ex-Traditional Gold Processing Area, Gogorea Village, Buru Island
Authors: Mariwy Abraham , Manuhutu Julita B. , Frans Defany
Published: August 2024

This study examines the accumulation of metallic mercury by several types of plants in the traditional gold processing area in the village of Gogore, Buru district. The plants that were sampled in this study were guava, lempuyang gajah, and harendong bulu. These three plant species were chosen because they dominate the vegetation in the gold processing area. The analysis results showed that the lempuyang gajah was the plant that accumulated the highest mercury metal, namely in the roots of 16.79 ppm and the leaves of 15.03 ppm. Guava plants accumulated metal mercury in the roots and leaves of 11.73 ppm and 9.90 ppm, respectively. Meanwhile, harendong plants accumulated mercury in the roots and leaves of 2.59 ppm and 10.39 ppm, respectively. The BCF values â€‹â€‹of guava, lempuyang gajah, and harendong bulu plants were 1.58, 0.41, and 0.39, respectively. Meanwhile, the TF values â€‹â€‹of the three plants were 0.84, 0.89, and 4.01, respectively. From these results, it can be concluded that the three plants can accumulate mercury in high enough concentrations, so these three types of plants are categorized as hyper tolerant plants and accumulators.
Preparation of Natural Ouw Clay-Chitosan Composite and Its Application as Lead and Cadmium Metal Adsorbent
Authors: Bijang Catherina M. , Tanasale M.F.J.D.P. , Kelrey Adhi G. , Mansur Inda Ulfa , Azis Thamrin
Published: August 2024

This study aims to obtain the optimum ratio of Ouw Natural Clay  (LAO):Chitosan in the manufacture of chitosan-LAO composites. The composite will be used as an adsorbent for heavy metals Lead (Pb) and Cadmium (Cd). LAO-Chitosan composites were made with the ratio of LAO:Chitosan = 1.25:1, 2.5:1, 5:1. XRD and SEM were carried out for each composite. The performance as a Cd metal adsorbent was determined by calculating the adsorption capacity. Composites with a ratio of 1.25:1 have the best adsorption capacity. The performance as adsorbent for Cd metal was determined by calculating the absorbed Cd concentration. Maximum results are achieved by composites with a ratio of 5:1.
Chemical Analysis of Rice from Converted-to-Organic Paddy Field in Lombok Island
Authors: Savalas Lalu Rudyat Telly , Loka I Nyoman , 'Ardhuha Jannatin
Published: August 2024

Chemical analysis has been undertaken to investigate the nutrients compositions and the presence of residual pesticides from rice cultivated from converted-to-organic paddy fields in Lombok Island. The nutrients being investigated were macronutrients (carbohydrates, fat, and proteins), micronutrients (beta-carotene), metal ions, and minerals, whereas pesticides being investigated were organo-chlorides residues such as endrin, delta-BHC, dieldrin, etc. The chemical analysis results were compared to those from rice cultivated from conventional farming, which uses chemical pesticides. It was revealed that there is no difference in the nutrients compositions of rice produced from converted-to-organic paddy fields to those from conventional farming. Moreover, it was shown that both rice samples from converted-to-organic and conventional farming paddy fields have no detectable residual pesticides. This finding suggests that the absence of residual pesticides from rice samples does not necessarily correspond to the application of organic farming in the converted-to-organic land. There is not robust evidence that the application of organic alters the nutrient composition of rice. This result also underlines the need to further investigate the real benefits of organic rice farming products in terms of nutritional composition and safety.
Development of Differential Pulse Anodic Stripping Voltammetry Technique for Cadmium(II) Detection and Its Application in Water Spinach
Authors: Putra Budi Riza , Aristri Manggar Arum , Rohaeti Eti , Wahyuni Wulan Tri
Published: August 2024

Cadmium is a toxic pollutant that is harmful to the environment and humans. The purpose of this research was to develop a method for cadmium(II) detection using differential pulse anodic stripping voltammetry (DPASV) using a glassy carbon electrode. The developed method was then applied for cadmium detection in the vegetable samples which is water spinach. The developed method was optimized in several parameters such as potential window, deposition potential, deposition time, and scan rate. The developed method for cadmium(II) detection was also investigated in its analytical performance includes linearity, precision, detection limit, and quantitation limit. The optimum conditions for cadmium(II) detection in 0.1 M KCl using DPASV technique obtained such as potential window from -1200 to -100 mV, deposition potential of -1100 mV (vs Ag/AgCl), and deposition time of 360 s. It was obtained good linearity for cadmium(II) detection using the DPASV technique with an R2 of 0.996. The precision was expressed as %SBR with 0.66%. The detection and quantitation limits for cadmium(II) detection were 0.4206 ÂµM~0.0771 ppm and 0.5525 ÂµM~0.1013 ppm, respectively. The developed method was then applied for cadmium(II) measurement in the water spinach sample and the obtained cadmium(II) concentration in water spinach was 0.2399 mg/Kg.
PENGARUH KEPEMIMPINAN DAN KERJASAMA TIM TERHADAP KINERJA KARYAWAN DENGAN SEMANGAT KERJA SEBAGAI VARIABEL INTERVENING studi kasus pada PT Equityworld Futures Semarang
Authors: Amalia Della Khanifatul , Nugroho Marno
Published: August 2024

Tujuan penelitian ini adalah untuk mengetahui pengaruh kepemimpinan dan kerjasama tim terhadap kinerja karyawan melalui semangat kerja. Populasi dalam penelitian ini adalah karyawan PT Equityworld Futures Semarang yang sudah bekerja minimal selama 2 tahun, dengan sampel menggunakan puporsive sampling , pengambilan data menggunakan kuesioner. Analisis data menggunakan keluaran SPSS. Hasil penelitian ini mengungkapkan bahwa kepemimpinan dan kerjasama tim berpengaruh positif signifikan terhadap semangat kerja. Kepemimpinan dan tim kerjasama berpengaruh positif signifikan terhadap kinerja karyawan dan semangat kerja berpengaruh positif signifikan terhadap kinerja karyawan serta semangat kerja mampu menjadi variabel intervening .Kata Kunci : Kepemimpinan, Tim Kerjasama, Semangat Kerja, Kinerja karyawan
PENINGKATAN PERILAKU KERJA INOVATIF MELALUI KUALITAS KEHIDUPAN KERJA DAN PENGEMBANGAN KARIR SEBAGAI VARIABEL MEDIASI STUDI KASUS PADA KARYAWAN PT CISARUA MOUNTAIN DAIRY (CIMORY) CABANG KABUPATEN SEMARANG
Authors: Nurcahyo Satria Avianda
Published: August 2024

Adanya pengaruh yang besar terhadap tatanan dunia politik, sosial, dan ekonomi dibawa oleh globalisasi, baik di sektor pemerintahan maupun bisnis. Dengan demikian, perhatian terhadap kualitas kehidupan kerja karyawan menjadi penting untuk meningkatkan kinerja bisnis. Dengan mengembangkan karir, karyawan didorong dan termotivasi untuk melaksanakan tugas-tugas mereka dengan efektif dan efisien. Tingkat efektivitas dan efisiensi kerja karyawan secara langsung mempengaruhi potensi pertumbuhan organisasi atau perusahaan meningkatkan kinerjanya secara maksimal. Populasi penelitian ini adalah karyawan tetap di PT. Cisarua Mountain Dairy (Cimory) Kabupaten Semarang..Divisi Marketing �yang dinilai cocok pada variabel Perilaku Kerja Inovatif yang berjumlah 210 orang terdiri dari 200 karyawan laki-laki dan 10 karyawan perempuan. Teknik pengambilan sampel yang digunakan dalam penelitian ini adalah sensus dengan tujuan jumlah seluruh populasi dijadikan penentuan jumlah sampel, penelitian menggunakan teknik sensus sebesar 210 responden. Hasil penelitian ini terbukti bahwa Kualitas Kehidupan Kerja� berpengaruh positif dan signifikan terhadap Perilaku Kerja Inovatif.Hasil penelitian ini terbukti bahwa Kualitas Kehidupan Kerja� berpengaruh positif dan signifikan terhadap Pengembangan Karir.Hasil penelitian ini terbukti bahwa Pengembangan Karir� berpengaruh positif dan signifikan terhadap Perilaku Kerja Inovatif. Hasil penelitian ini terbukti bahwa Pengembangan Karir mampu menjadi variabel mediasi. Hendaknya karyawan PT. Cisarua Mountain Dairy (Cimory) Kabupaten Semarang Salah satu pertimbangan utama bagi setiap perusahaan adalah memfasilitasi pengembangan karir karyawan dalam lingkungan kerja mereka. Pengembangan karir mencapai tingkat optimal ketika kualitas kehidupan kerja terpenuhi. Sebaliknya, kualitas kehidupan kerja dapat terwujud saat perusahaan mengamati kinerja yang baik dari karyawan dan karyawan merasa terlibat dalam pengambilan keputusan serta pembentukan kebijakan perusahaan. Prinsip ini juga berlaku untuk PT. Cisarua Mountain Dairy (Cimory) di Kabupaten Semarang.��Kata Kunci : Kualitas Kehidupan Kerja, Pengembangan Karir, Perilaku Kerja Inovatif�
Peran Digital Platform Capability Untuk Business Sustainability Era Pandemi COVID-19 Pada Pelaku Ekonomi Kreatif Berbasis Potensi Daerah Di Grobogan: Mix Methods Perspective
Authors: Rahayu Indah , Prameswari Dita , Azzahra Fariha , Fitriyani Nurul , Yulia mustika Rika
Published: August 2024

Tujuan dari penelitian ini adalah untuk untuk menganalisis anteseden dengan menggunakan pendekatan mix methods. Kondisi pertumbuhan ekonomi di saat pandemi berlangsung menyebabkan seluruh aspek kehidupan terdampak pandemi,terutama dalam tiga aspek kehidupan yaitu kesehatan, pendidikan dan sektor ekonomi yang juga mengalami dampak cukup besar. Permasalahan ini terjadi terhadap pelaku ekonomi kreatif selama pandemi covid-19 terjadi penurunan omset secara signifikan. Metode dalam penelitian ini menggunakan metode mix methods dengan jenis desain concurent embedded. Sampel kuantitatif sebanyak 100 responden dengan menggunakan metode purposive sampling sedangkan sampel kualitatif sebanyak 6 key informan. Metode dalam penelitian ini adalah alat analisis SmartPLS 4.0. Hasil penelitian ini menunjukan bahwa digital platform capability berpengaruh positif dan signifikan terhadap dynamic stakeholder relationship quality. Digital platform capability berpengaruh positif dan signifikan terhadap innovation performance. Dynamic stakeholder relationship quality berpengaruh positif dan signifikan terhadap business sustainability. Innovation performance berpengaruh positif dan signifikan terhadap business sustainability.
Методичний підхід до визначення найбільш доцільних напрямків розвитку космічних систем в умовах обмеженого ресурсу. Модель основних факторів
Authors: Воробйов О. В. , Беспалько О. В.
Published: August 2024

У запропонованому методичному підході до визначення найбільш доцільних напрямків розвитку космічних систем в умовах обмеженого ресурсу враховуються проблеми і протиріччя щодо розвитку космічної діяльності в Україні, сутність яких полягає в обмеженості ресурсів, як наслідок агресії Російської Федерації проти України, в недостатньому рівні готовності технологій до швидкого виробництва зразків космічної техніки від моменту їх розробки та у впливі на процес прийняття рішення щодо визначення доцільних напрямків розвитку космічних систем множини факторів, які формують нестохастично невизначене середовище. Визначено, що на процес прийняття рішення в даному випадку впливають фактори, які мають природу походження в політичних та економічних процесах, а також у процесах, пов’язаних із технологічними спроможностями України. У методичному підході, який розробляється, вплив факторів іншої природи походження є незначним і їх вплив на прийняття рішення щодо найбільш доцільних напрямків розвитку космічних систем можна не враховувати. Розроблена модель основних факторів.
Classification of Tasks for Forensic Video Analysis
Authors: Vlasov O. O.
Published: August 2024

The article is devoted to the theoretical reflection on the issue of the lack of a unified approach to the classification of tasks of forensic video analysis. General concepts of the subject, object and the classification of tasks have been considered from the perspective of forensic expertology. Also, the notions of the subject and object of forensic video examination have been provided. An author’s classification of the tasks for forensic video recordings analysis has been proposed, which will further simplify the inevitable process of conduct standardization of forensic video analysis within all the diversity of forensic expert institutions in the Russian Federation.
Application of Chromatographic Methods in Forensic Examination of Wine Products
Authors: Kazantseva I. L. , Egorova V. V. , Osokin D. M.
Published: August 2024

. The article overviews the changes in the Russian legislation regarding the terminology and classification of wine products, which should be considered when solving diagnostic and classification problems within the framework of complex examinations (commodity expertise of food products and forensic examination of materials, substances and products of alcoholcontaining liquids). The authors stress the importance and relevance of chromatographic methods in wine products examination. They also present the results of testing a method for organic acids determination in wine using JetChrom liquid chromatograph. Some examples are given from expert practice regarding the use of the gas chromatographic methods for analyzing the composition of toxic micro-impurities of base alcohol liquids and the high-performance liquid chromatography method for analyzing the composition of organic acids of the objects under research.
Simultaneous Utilization of Mood Disorder Questionnaire and Bipolar Spectrum Diagnostic Scale for Machine Learning-Based Classification of Patients With Bipolar Disorders and Depressive Disorders
Authors: Kim Kyungwon , Lim Hyun Ju , Park Je-Min , Lee Byung-Dae , Lee Young-Min , Suh Hwagyu , Moon Eunsoo
Published: August 2024

Objective Bipolar and depressive disorders are distinct disorders with clearly different clinical courses, however, distinguishing between them often presents clinical challenges. This study investigates the utility of self-report questionnaires, the Mood Disorder Questionnaire (MDQ) and Bipolar Spectrum Diagnostic Scale (BSDS), with machine learning-based multivariate analysis, to classify patients with bipolar and depressive disorders.Methods A total of 189 patients with bipolar disorders and depressive disorders were included in the study, and all participants completed both the MDQ and BSDS questionnaires. Machine-learning classifiers, including support vector machine (SVM) and linear discriminant analysis (LDA), were exploited for multivariate analysis. Classification performance was assessed through cross-validation.Results Both MDQ and BSDS demonstrated significant differences in each item and total scores between the two groups. Machine learning-based multivariate analysis, including SVM, achieved excellent discrimination levels with area under the ROC curve (AUC) values exceeding 0.8 for each questionnaire individually. In particular, the combination of MDQ and BSDS further improved classification performance, yielding an AUC of 0.8762.Conclusion This study suggests the application of machine learning to MDQ and BSDS can assist in distinguishing between bipolar and depressive disorders. The potential of combining high-dimensional psychiatric data with machine learning-based multivariate analysis as an effective approach to psychiatric disorders.
Viral Anxiety, Reassurance-Seeking Behavior, and Depression Mediate the Influence of Dysfunctional Self-Focus on Preoccupation With COVID-19 Among Infected Cases
Authors: Yoon Byeongha , Hong Jihoon , Chung Seockhoon
Published: August 2024

Objective Amid the coronavirus disease 2019 (COVID-19) pandemic, the pervasive threat of infection has heightened public and individual health concerns. In the context of instability, although the dysfunctional aspect of self-focus was prominent, preoccupation with viral infection was greater. This study explored the applicability of a cognitive-behavioral model of hypochondriasis to individuals infected with COVID-19 and assessed whether dysfunctional self-focus were associated with the development of preoccupation.Methods An anonymous online survey was conducted via a professional survey platform in December 2022. Participants’ clinical characteristics and responses to rating scales were collected, including Obsession with COVID-19 Scale (OCS), Coronavirus Reassurance-Seeking Behaviors Scale (CRBS), Stress and Anxiety to Viral Epidemic-6 items (SAVE-6), Patient Health Questionnaire-2 items (PHQ-2), and Dysfunctional Self-focus Attributes Scale (DSAS).Results Among the 265 participants, preoccupation with COVID-19 was predicted using CRBS (β=0.60, p<0.001), SAVE-6 (β=0.20, p=0.007), and PHQ-2 (β=0.13, p<0.001) scores. Mediation analysis revealed that viral anxiety influenced this COVID-19 preoccupation, with the relationship mediated by coronavirus reassurance-seeking behavior. Another analysis indicated that dysfunctional self-focus had a significant total effect on preoccupation with COVID-19. However, its direct impact was statistically insignificant, with the association primarily influenced by three mediating factors: viral anxiety, depression, and reassurance-seeking behavior.Conclusion Preoccupation with coronavirus is influenced by viral anxiety, depression, and reassurance-seeking behavior. Two mediation analyses showed that the application of the cognitive-behavioral model of hypochondriasis is feasible among COVID-19-infected cases and the association of dysfunctional self-focus with mediating factors. This finding highlights the need for personalized psychological support in managing COVID-19 cases.
Keberlanjutan UMKM: Dampak Orientasi Kewirausahaan untuk Peningkatan Kinerja Bisnis
Authors: Nuraini Reny , Didit Darmawan
Published: August 2024

Persaingan dan perubahan-perubahan menjadi tantangan bagi keberlanjutan UMKM untuk dapat mempertahankan bahkan meningkatkan kinerja perusahaan. Upaya peningkatan kinerja dapat dilakukan dengan berorientasi kewirausahaan yang membantu perusahaan lebih berdaya saing, membuat strategi, mencapai tujuan bisnis, dan mudah beradaptasi. Studi ini menggunakan pendekatan kuantitatif deskriptif yang dilakukan dengan survei. Populasi studi ini adalah Sidoarjo dengan jumlah sampel sebanyak 100. Uji yang dilakukan terdiri dari uji validitas dan reliabilitas untuk mengukur kelayakan item pernyataan dapat dinyatakan valid dan reliabel, analisis regresi linier sederhana, uji t dan koefisien determinasi untuk mengetahui pengaruh variabel bebas dengan variabel terikat. Studi ini diteliti untuk mengetahui dampak dari variabel orientasi kewirausahaan dengan variabel kinerja bisnis. Temuan yang telah dibuktikan yaitu ada dampak positif antara orientasi kewirausahaan dengan kinerja bisnis secara signifikan. Sebesar 61,9% (nilai R Square 0,619) orientasi kewirausahaan memberikan kontribusi untuk peningkatan kinerja bisnis.
INSTITUTIONALISATION OF HALAL POLICY: A Case Study in Thailand
Authors: Aulia Vira , Surwandono Surwandono
Published: August 2024

Abstract: This article aims to analyze how has the halal industry evolved and grown in non-Muslim countries, with a specific focus on Thailand as a case study. This study uses a qualitative research method whose unit of analysis is the Thai government with the object of research being Thailand’s policy in promoting itself as a country that is friendly to Muslim tourists as an effort of public diplomacy. According to the findings, the halal industry, which involves producing and distributing goods and services permissible under Islamic law, is regulated in Muslim-majority countries and is growing in non-Muslim countries. Thailand, a non-Muslim country, has successfully developed its halal industry and is now one of the largest exporters. To overcome barriers, Thailand can promote awareness, encourage community involvement, and improve product quality and diversification. Economically, it can provide financial incentives and support for certification, while ensuring a halal-compliant supply chain. Politically, it can strengthen diplomatic relations and develop consistent halal standards. Addressing political and social unrest can create a stable environment for the halal industry.

Keywords: Halal industry, non-Muslim countries, Thailand.
AI in education: Pedagogical and ethical analysis of the implementation of ASSISTments in the school environment
Authors: Bazoukis Georgios A. , Halkidis Spyros T. , Pepes Evangelos , Venardos Pantelis
Published: August 2024

The problem behind our research that was investigated was the evaluation of an artificial intelligence in education tool, namely ASSISTments by seventy one science and technology students in a small city. The objective was to find to what extent the students assimilate this tool. The data collection and instrumentation were done by the tool itself. The data analysis methods used were pie charts based on the answers of the students to questions examining the level of acceptance of the tool by them as well as linear regression investigating the relation between the students’ grades and the level of acceptance of the tool by them. The main research results show a high level of acceptance of ASSISTments by them. Additionally, pedagogical implications of the use of ASSISTments were examined.