bluuebunny/crossref_metadata_2025_split huggingface dataset:
Preparation of ZnO-CuO composite photocatalyst using the sonochemical method
Authors: Zainul Rahadian , Effendi Jon , Mashuri  
Published: November 2019

Abstract
This research aims to synthesize ZnO-CuO composites to be applied as a catalyst material that acts on visible light. The preparation process of ZnO-CuO composite using sonochemistry method. Percusor used in this research is Zn (CH3COO)2.2H2O and CuSO4.5H2O with a ratio of 1: 1, 2: 1, 3: 1, 4: 1, 5: 1 and variations in the exposure time used 70, 90, 105, 120, 135 minutes. The result of the FTIR spectral characterization shows that the formation of new peak is ZnO-CuO composite wave at 400-600 nm area, with UV-DRS Obtained ZnO band gap value of ∼ 3:25 eV and ZnO-CuO 2: 1 ∼ 2.75 eV.
The flavonoid levels in subtituted noodles of tempe flour and carrot extract
Authors: Maryam S 
Published: November 2019

AbstractNoodles are foods made from wheat flour, so it contain high carbohydrates, because of that it is necessary to substitute tempe flour and carrot extract, so that the noodles contain bioactive components and become functional food. The aims of study is to determine the levels of flavonoids in substituted noodles of tempe flour and carrot extract. This research is a developing research on noodle making process. There are four types of noodles made, namely standard/control noodles, and noodles made with a ratio of wheat flour : tempe flour and carrot extract are (50 : 30 : 20)/noodles 1; (50 : 25 : 25)/noodles 2 and (50 : 20 : 30)/noodles 3. The results of the three replications stated that the substitution affected the flavonoid component of noodles. There was an increase in flavonoid levels insubstituted noodles of tempe flour and carrot extract compared with control noodles. Flavonoid levels in control noodles were 2.69 mg/100 g and in noodles 1, 2 and 3 at 18.90 mg/100 gr; 16.77 mg/100 g and 21.93 mg/100 g or an increase of 7; 6.23 and 8.15 times of control noodles. Subtituted noodles of tempe flour and carrot extract are functional foods.
The optimal prediction the best quality of tempe gembus by using taguchi method
Authors: Khairani S , Afikah A , Abdullah W D , Purwanto W 
Published: November 2019

Abstract
The purpose of the study is to predict the best quality of tempeh gembus from the mount of tofu waste, whey, duration of immersion, and total of yeast for fermentation process. The design of experiment in Taguchi method with 4 factors and 3 levels are used in experimental process. Thus, 9 total of experimental procedure is performed in this process. To assess the quality of the tempeh gembus, the sensory evaluation are introduced in sharp, taste, and the color. Then, the best result of tempe gembus is 2 kg of tofu waste soaked in 3 liters of whey water, for 72 hours, and the amount of yeast is 15 gr. Moreover, for continuation of this research process is the test of tempe gembus with the best quality as an effort in cholesterol reducing level in blood.
Analysis of magnetic field anomalies before earthquakes based on ULF (Ultra Low Frequency) method using magnetic sensor data in Sumatra
Authors: Fika Ramadhani Ade , Syafriani  , Triyono Rahmat , Ubaya Tri 
Published: November 2019

Abstract
Sumatra has a complex tectonic system which it causes to be prone to earthquakes. Therefore, early warning before earthquake is needed with the study of earthquake precursors using Ultra Low Frequency (ULF) method. This method applied to the recording data of the Earth’s magnetic field for 30 to 3 days before the earthquake event. This study also carried out the prediction of earthquake magnitude and epicentre based on the amplitude of the anomaly and the distance of the station to the earthquake location. To ensure that the anomalies that occur are not due to external interference, the data is observed based on the Dst Index. In this study was found that the percentage of success was 74% approaching the actual data
Effect of glutaraldehyde to the mechanical properties of chitosan/nanocellulose
Authors: Arianita Agustina , Cahyaningtyas  , Amalia Bunda , Pudjiastuti Wiwik , Melanie Susiana , Fauzia Vivi , Imawan Cuk 
Published: November 2019

Abstract
Research on making films using chitosan, nanocellulose from pineapple leaf fiber, and glutaraldehyde were carried out as an effort to obtain alternative biodegradable plastics. Chitosan has low mechanical, therefore nanocellulose is added from pineapple leaf fibers and glutaraldehyde additives. This research was conducted to obtain the optimum glutaraldehyde additive variable that functions as a crosslinker. What chitosan used was 2% (w/v solution) and nanocellulose 3% (w/w chitosan) based on optimum results from previous research. The method used a casting method, chitosan and nanocellulose are dissolved and heated in acetic acid 1% then glutaraldehyde is added during cold and cast. Variable of glutaraldehyde added by 0%, 0.5%, 1%, 2%, and 3% (w/w chitosan). Tensile strength, elongation, functional groups, and absorbance were used to characterize film. The results showed that the results of FT-IR were a spectrum of chitosan and indicated the crosslinking between chitosan and glutaraldehyde. The tensile strength values change with the addition of glutaraldehyde. The optimum value of adding glutaraldehyde is 1% based on the results of tensile strength and the lowest absorbance.
Structural properties and bonding characteristic of magnesium (Mg) doped zinc oxide (ZnO)
Authors: Adam Fakhriah , Himawan Achmad , Aswad Muhammad , Tahir Dahlang 
Published: November 2019

Abstract
Structural properties and bonding characteristics of Mg doped ZnO by co- precipitation methods were characterized by using X-ray Diffraction (XRD) and Fourier Transforms Infrared (FTIR) spectroscopy. The analysis of FTIR showed peaks at 466.77 cm−1 and 451.31 cm−1 which correspond to the stretching of the oxygen bond in the ZnO structure and leads to defect formation by the oxygen atom detachment. This defect occupied by the Mg atom and proved by the widening of peak oxygen. The data XRD showed increasing the average size of ZnO crystal from 27.74 nm to 38.17 nm with the addition of 10% wt of Mg. These phenomena indicated agglomeration of the partial displacement of O2- by Mg2+ in the MgZnO structure. This study showed simple methods to combine with Mg atom and ZnO to produce potential materials for catalytic applications.
Diffraction and interference pattern by 4f imaging system to determine the thin film magnetic properties
Authors: Nauval F , Febie PS , Lukman HS , Arief S , Handoko Djati 
Published: November 2019

Abstract
Determine the magnetic properties of thin film material using X-ray has been attracting enormous attention in recent years. In this work, we propose a simple method to determine base on 4F imaging system. The narrow slit is applied to produce diffraction pattern in the X-ray scale. The slit width variation is applied to numerically obeserve the Fraunhofer diffraction pattern sequential changes. To demonstrate the sensitivity of the method, the power distribution of the temporal observed patterns was also measured. The selection of the object shape also discussed for comprehensive discussion.
Analysis of oxide content in sand and rock found in public mining of west sumatra province using XRF test
Authors: Kembar Sari Rindang 
Published: November 2019

Abstract
Indonesia is regionally located on two large plates, which are the Pacific plate in the north and the Australian plate in the south. Due to the geological activity of these two plates, it results in a complex tectonic pattern supporting the formation of mineralization. Therefore, Indonesia is considered as a country rich in various minerals and oxide sources. The purpose of this study is as a preliminary study to analyze the element of atom / oxide contained in rocks and sand found in public mining of West Sumatra Province. The initial identification done is to perform X-ray fluorescence test (XRF) on rock samples taken from Jorong Bukit Harapan Darmasraya Regency and Manggani, 50 Kota Regency. The sand samples are taken from Kupitan area Sijunjung Regency, Pinti Kayu Gadang Muara Labuh and jorong pulai Sitiung Darmasraya regency. XRF test results for rock and sand samples from these five areas indicate the presence of six dominant oxides with large percentage i.e. Al2O3, SiO2, P2O5, CaO, TiO2, Fe2O3 oxides. The content of SiO2, Al2O3, Fe2O3, CaO, TiO2, and P2O5 foundon rock samples is quite high 53.01-57.77%, 29.982-32.191%; 5.113-10.302%; 2.119-2.367%; 0.9021.809%, and 0.685-0.968% respectively. Meanwhile, the sand samples indicate the content of SiO2, Al2O3, Fe2O3, CaO, TiO2, and P2O5 15.103-52.652%; 5.379-17.621%; 9.22-58.593%; 1.54-9.22%; 0.702-12.238% and 1.261-2.545% respectively.
Subsurface analysis of chinese city sites in north sumatra medan marelan subdistrict using geoelectric methods
Authors: Juliani Rita , Rahmatsyah  , Tampubolon Togi , Hutahean Juniar , Azhari Ichwan 
Published: November 2019

Abstract
The area of the Chinese city site is a maritime trading network that entered North Sumatra via the Sumatra Northeast coastline in the 11th to 14th centuries. The Chinese City Heritage site owned by North Sumatra located in Paya Pasir Village, Medan Marelan Subdistrict. Information on the condition and subsurface shape of the site is needed to reveal the existence of the site so that it is easy to excavate and does not damage the surrounding soil. The study aimed to analyze the distribution of Chinese cities below the surface. The research was carried out by using the 6-track Wenner-Schlumberger geoelectric method. Each track used 16 electrodes with an electrode distance of 5 m. The data was processed using Res2DinV and Surfer software. Alluvial layers dominated the results obtained from the subsurface structure. The resistivity of the northern part of the site has a low anomaly starting at 1.25 meters which were the uppermost layer dominated by shallow brackish groundwater that has been intruded. The Chinese city site in the form of temples was found in the southern part at a depth of 1.25 meters to 3.88 meters marked with red bricks filled with water with resistivity 28.9-56.7 Ωm and findings of artifacts around the research location.
Structural and bonding properties of honeycomb structure of composite nanoparticles Fe3O4 and activated carbon
Authors: Ilyas Sultan , Tahir Dahlang , Suarni  , Abdullah Bualkar , Fatimah Siti 
Published: November 2019

Abstract
Magnetite nanocomposite synthesis and activated carbon with the addition of polyvinyl alcohol (PVA) as an absorber of electromagnetic waves have been successfully carried out with variations in the thickness of 4 mm, 6 mm, 8 mm, and 10 mm. Characterization was carried out with XRD (X-Ray Diffraction), XRF (X-Ray Fluorescence), FTIR (Fourier Transform Infrared) and VNA (Vector Network Analyzer) with a working frequency of 3 GHz - 7.5 GHz. XRD characterization controls the formation of magnetite (Fe3O4) and determines the crystal size. The diffraction peaks of the absorber at (221), (331) and (440) with a size of crystal on 10.46 nm. Characterization of XRF shows the chemical composition of the absorber which indicates the formation of nanocomposites, FT-IR spectrum obtained by C = C alkene bond and C-H alkane derived from activated carbon, honeycomb paper and magnetite (Fe3O4). According to the data, it contributes to the formation of molecular bonds from nanocomposite absorber. Characterization of VNA was obtained by the best absorber with reflection loss value of -16.24 dB, the frequency of 5.77 GHz at a thickness of 10 mm.
Synthesis of ZnO nanoparticles in polyvinyl alcohol solutions using laser assisted synthesis in solution (LASiS) method
Authors: Wiguna P.A. , Yudasari N. , Djuhana D. , Imawan C. 
Published: November 2019

Abstract
ZnO nanoparticles are widely studied because of their superior properties so they are widely used in various applications. Structural modification with the right synthesis method is the key to getting superior properties. In this experiment, Laser Assisted Synthesis in Solution (LASiS) method was used to synthesize ZnO nanoparticles. The LASIS method was carried out using a metal plate Zn as a target placed in a solution of polyvinyl alcohol (PVA) with different concentrations, namely 1%, 2%, 3% and 4%. This laser ablation has caused a solution of gray colloidal ZnO nanoparticles. Different PVA concentrations do not affect the color of the produced ZnO nanoparticle solution. The properties and structure of ZnO nanoparticles were characterized using UV-Vis spectrophotometer, Zetasizer spectrometer, and Transmission Electron Microscopy (TEM). The UV visible absorbance spectrum shows the maximum absorption characteristics of ZnO nanoparticles observed at a wavelength of 344 nm. The maximum absorbance value rises by increasing the concentration of PVA and reaching the maximum value at a concentration of 3%. These ZnO nanoparticles have a size around 80 nm. TEM analysis shows that ZnO nanoparticles have a spherical shape and have good crystallinity based on SAED measurements. This property is due to the role of PVA in the synthesis process.
The seismotectonic of West Sumatra
Authors: Syafriani  
Published: November 2019

Abstract
tectonic region of West Sumatra is very active. In the western part there is a zone of deposition of the Indo-Australian plate and Mentawai fault while in the mainland is part of the Sumatra Fault System. This tectonic activity can be seen from the analysis of the distribution of seismicity in each fault or fault segment using earthquake data from 1990 to 2014 from regional and global stations. Analysis of the focal mechanism for shallow earthquakes shows the tectonic state of this region. One-dimensional surface wave analysis is also carried out to show surface wave propagation velocity. The results of this study indicate the type of fault in the West Sumatra region.
Design of a microstrip metamaterial for C-band Radar absorber
Authors: Sentosa Media , Yohandri  
Published: November 2019

Abstract
Electromagnetic wave absorber has an important role in radar technology used for military as well as for civilian application. There are many electromagnetic wave absorbing technologies used in current radar technology, one of which is an absorber based on metamaterial. In this paper, design of a microstrip metamaterial for C-band radar absorber will be discussed. The metamaterialabsorbers on theC-bandrange is designed on microstrip material having a thickness 4.8 mm and dielectric constant 2.17. There are several techniques can be implemented to broad the working frequency, which are increasing substrate thickness, decreasing dielectric constant and patch modification. In this work, the simulation method is employed for optimizing the design and achieving good electromagnetic wave absorption at the C-band working frequency. Simulated result show the microstrip metamaterial design has broadband absorption lower than -10 dB ranging from 4.3 GHz to 7.1 GHz. Based on the characteristics, this design can be realized as radar absorber at C-band frequency
Morphological Diversity analysis of Yam (Dioscorea alata L.) from Banggai Islands, Indonesia
Authors: Yalindua A , Sudarsono  , Bintoro H M H. , Setiawan A 
Published: November 2019

Abstract
The study aimed to determine the variation in 38 of yam accessions from Banggai Islands, Central Sulawesi. This study was conducted in August 2012 to May 2013. Morphological data were analyzed using principal component analysis (PCA). The results of ten PC analyzes of a total of 30 components were observed (Table 1) giving eigenvalues greater than 0.25 explains 77.7% of total diversity. Three of the ten PC that determine the yam variant level are PC 1 purple color character (24.3%); PC 2 which stem diameter character (13.3%); PC 3 leaf surface texture, tuber shape and maturity time (8.4%). Cluster analysis results show there are four groups formed, which are A (16 varieties); B (2 varieties); C (19 varieties); and D (1 variety).
Anthocyanine pigment identification of north Sulawesi rice brand crude extracts, as potential natural antioxidant
Authors: Moko E M , Ngangi J , Rahardiyan D 
Published: November 2019

Abstract
Rice bran are by products of paddy to rice processing. Confirmed by many researches that rice bran contains various bio-active components, and specifically antioxidants where more than 100 variances of antioxidant. Aside of tocopherols and tocotrienols, oryzanols are active endemic compounds found in rice bran that functions as anti-inflammation even anticancer. Pigmented Paddy was reported to be a source of potential antioxidant because they contain high concentrations of polyphenols and anthocyanine that also has functions as antiinflammation and also reduction of cholesterol in the blood. The purpose of this research was to identify active anthocyanine in crude extracts of Red Variety Rice Bran of North Sulawesi. Previous results have separated component fractions of the crude extracts of red variety rice bran of North Sulawesi based on their levels of polarity (buthanol, hexane and ethyl acetate). This separation process further continued by means of coloumn chromatography with a mobile phase of 1:1 hexane and acetone followed by a thin layer chromatography. Anthocyanine identification was determined by Liquid Chromatography / Mass Spectrometry - MS, where the ethyl acetate extract was confirmed as cyanidin-3-glucoside (C3G) with a molecular weight of 449,1367 kDa.
The effect of giving some artificial diet on the development of assassin bug rhinocoris fuscipes f. (hemiptera: reduviidae) in the laboratory
Authors: Batubara J S , Bakti D , Siregar A Z 
Published: November 2019

Abstract
Rhinocorisfuscipes are predators that play a role in controlling plant pests. This study aims to determine the effect of some artificial diet on the breeding of R. fuscipes assassin bug in the laboratory. This research was conducted from July to August 2018, at the Laboratory of Plant Diseases, Faculty of Agriculture, Universitas Sumatera Utara. The research method used a Non-Factorial Completely Randomized Design (CRD) consisting of controls (T. molitor), egg yolks, Artemia salina, plant foods from soybean (Glycine max). The results showed that control treatment F = 85,397 (p <0.05), egg yolk F = 17,552 (p <0.05), Artemia salina F = 8,936 (p <0.05), plant feed from soybean juice F = 8,377 (p <0.05) significant effect on R. fuscipes body length, on R. fuscipes body width only egg yolk treatment F = 7.161 (p <0.05) which had a significant effect on body weight and only soybean treatment F = 12.297 (p <0.05) which was significant.
The addition of various carbon sources on growing media to increase the siderophore level of fluorescent pseudomonad bacteria
Authors: Advinda Linda , Pratama Ilham , Fifendy Mades , Anhar Azwir , Armaleni  
Published: November 2019

AbstractFluorescent pseudomonad is a member of the rhizobacterial groups which has the potential to be developed as an agent for inducing plant resistance. Several species of fluorescent pseudomonad are capable of producing siderophore. Siderophore is an organic antimicrobial compound that plays a role in biological control of plant diseases. The aim of the study was to determine the best carbon source added to the growing media to increase the levels of siderophore from the fluorescent pseudomonad PfCas3 and PfLAHp2 isolates. This research is an experimental study that use a completely randomized design with 4 treatments, which is the addition of carbon sources of glucose, fructose, glycerol on growing media, and King’s B medium (control), and 3 replications. Detection of siderophore was measured with a spectrophotometer at a 410 nm wavelength (λ). The data obtained were analyzed using ANOVA and DNMRT continued testing at a significant level of 5%. The results showed that the best carbon source added to the fluorescent pseudomonad PfCas3 isolate growing medium was glucose, with the siderophore level produced 1,574 atλ= 410 nm. Glucose added to the growing medium can also increase the levels of siderophore from the fluorescent pseudomonad PfLAHp2 isolate, which is 1,464 atλ= 410 nm.
The sirangak (cyanthillium cinereum; asteraceae) oil accelerates sliced-wound healing by enhanching the hematological endurance in male albino mice
Authors: Fadillah M , Santoso P 
Published: November 2019

Abstract
Sirangak (Cyanthillium cinereum; Asteraceae) is a medicinal plant traditionally used by Minangkabaunese, West Sumatra to heal the wounds. However, the underlying mechanism of this plant in healing the wounds is scientifically unelucidated. This current research aimed to clarify that Sirangak could potently accelerate the wound healing by enhanching the hematological performances. We conducted an experiment by using adult male mice consisted of control group and Sirangak oil-topical treated group after being wounded by superficial slice cuting. Subsequently, the wound healing rate was determined and the hematological profiles were monitored periodically for a week. The results demonstrated that Sirangak oil could significantly accelerate the wound healing by 85.6% as compared to control with a 71.6% of wound recovery. The hematological analysis indicated that Sirangak oil could significantly increase the erythrocyte count, hemoglobin concentration, hematocrite, mean cell volume (MCV) and mean corpuscular hemoglobin concentration (MCHC) particularly during the early day of treatment. However, Sirangak oil did not significantly affect the leucocyte profiles except for the granulocyte. Therefore, the Sirangak oil could potently accelerate wound healing by enhanching the physiological endurance particularly the erythrocyte and hemoglobin level. This finding underpins a scientific evidence for further use of Sirangak in medicine.
Characterization of endophyt fungi in bali grapevine (vitis vinifera l. var alphonso lavalle) in Buleleng, Bali
Authors: Putu Ristiati Ni , Ayu Putu Suryanti Ida , Putu Manik Widiyanti Ni Luh , Rai Sudiatmika AAIA , Pradipta Utama Anggan 
Published: November 2019

Abstract
Bali grapevine is a local fruit cultived in banjar district, but the productivity and quality of the grapes has decreased each year because of disease, consequently farmers have to use chemical pesticides to deal with disease attacks that actually cause adverse effects. So a solution is needed to solve this problem by using endophytic fungi as a natural biological agent. This research was aimed to determine the (1) total number of fungi colonies and (2) genus of endophytic fungi on Bali grapevine in a vineyard at Banjar village. The observation using descriptive research. Based on the observation that had been done, the result of this research were(1) There was a variation of total number of endophytic fungi colonies in the roots part 6.5 x 104 CFU/gram, in the stems 2.9 x 104 CFU/gram, and in the leaves 2.6 x 104 CFU/gram, so it was known that the largest total number of endophytic fungi colonies found in the root. (2) Genus of endophytic fungi found on the root, stem, and leaf, were Trichoderma, Fusarium, Scytalidium, Aspergillus, Scedosporium, Alternaria, dan Microsphaeropsis.