bluuebunny/crossref_metadata_2025_split huggingface dataset:
Ptychographic phase retrieval by proximal algorithms
Authors: Yan Hanfei 
Published: January 2020

Abstract
We derive a set of ptychography phase-retrieval iterative engines based on proximal algorithms originally developed in convex optimization theory, and discuss their connections with existing ones. The use of proximal operator creates a simple frame work that allows us to incorporate the effect of noise from a maximum-likelihood (ML) principle. We focus on three particular algorithms, namely proximal minimization, alternating direction method of multiplier and accelerated proximal gradient (APG). We benchmark their performance with numerical simulations, and discuss their optimal conditions for convergence and accuracy. An experimental dataset is used to demonstrate their effectiveness as well, in which case an array of cubic Au nanoparticles with a size of 50 nm is imaged. We show that with the presence of Poisson noise, a dataset with photon counts up to 104 at one detector pixel already requires ML-based methods to achieve a stable convergence. Among the three algorithms derived in this work, APG method is reported first time for its application in ptychographic reconstruction and shows superior performance in terms of both accuracy and convergence rate with a noisy dataset.
In silico optical control of pinned electrical vortices in an excitable biological medium
Authors: Majumder Rupamanjari , Zykov Vladimir S , Panfilov Alexander V 
Published: January 2020

Abstract
Vortices of excitation are generic to any complex excitable system. In the heart, they occur as rotors, spirals (2D) and scroll waves (3D) of electrical activity that are associated with rhythm disorders, known as arrhythmias. Lethal cardiac arrhythmias often result in sudden death, which is one of the leading causes of mortality in the industrialized world. Irrespective of the nature of the excitable medium, the rotation of a rotor is driven by its dynamics at the (vortex) core. In a recent study, Majumder et al (2018 eLife
7 e41076) demonstrated, using in silico and in vitro cardiac optogenetics, that light-guided manipulation of the core of free rotors can be used to establish real-time spatiotemporal control over the position, number and rotation of these rotors in cardiac tissue. Strategic application of this method, called ‘Attract-Anchor-Drag’ (AAD) can also be used to eliminate free rotors from the heart and stop cardiac arrhythmias. However, rotors in excitable systems, can pin (anchor) around local heterogeneities as well, thereby limiting their dynamics and possibility for spatial control. Here, we expand our results and numerically demonstrate, that AAD method can also detach anchored vortices from inhomogeneities and subsequently control their dynamics in excitable systems. Thus, overall we demonstrate that AAD control is one of the first universal methods that can be applied to both free and pinned vortices, to ensure their spatial control and removal from the heart and, possibly, other excitable systems.
A Computational Theory Study of Surface Plasmon Resonance (SPR) Porcine Gelatine Detected Sensor based-on Fe3O4 Nanoparticle—CNT with ATR Method in Kretschmann Configuration
Authors: Lutfiyah Maulina , Aji Eko Prabowo Wahyu , Melati Asih 
Published: January 2020

Abstract
Accurate biomolecular detection can be performed through the Surface Plasmon Resonance (SPR) phenomenon. This study was conducted to simulate the effect of the addition of Fe3O4 nanoparticle and Carbon Nanotube (CNT) in the Kretschmann and Otto configurations using porcine detection sensors. This study employs the equation of reflectance for the investigations of SPR properties (i.e. SPR angle and reflectance value) using Matlab software version 7.12.0. This research was used ATR method with Kretschmann configuration, He-Ne laser on wavelength 632.8 nm, semi-circle prism type BK7 and metal layer of gold nanoparticles. The results of this research can be used in the detection of porcine gelatine by Kretschmann configurations. The best thickness of the gold layer and Fe3O4 layer are 50 nm and 0.05 nm. Moreover, the thickness of SWCNT used is 15 nm. The applied SWCNT is more effective than MWCNT on porcine detection. The SWCNT material also proved to be better used in SPR systems.
Implementation of Go language to calculate ground state energy of atoms based on Density Functional Theory (DFT)
Authors: Gita Arisha Lafitiara , Alfianto Enggar , Rusydi Febdian 
Published: January 2020

Abstract
This study is using Go programming language that support parallel programming for numerical calculation. The program was created is designed for calculate ground-state energy of electron, which is based on Density Functional Theory (DFT). The basic mathematics of this program is using many basic concept of numerical mathematics (matrix calculation, Poisson solver, and standard routine of numerical mathematics).
Apparent Diffusion Coefficient of Diffusion Weighted Imaging have Strong Correlation with the Malignancy Grading of Intracranial Tumor
Authors: Sensusiati AD 
Published: January 2020

Abstract

Background and purpose: Accurate imaging diagnosis before surgery is fundamental to determine whether a tumor is benign or malignant. Diagnosis only from structural MRI is not specific. However, the diffusivity of the benign and malignant lesion is different and could be measured by ADC. The Apparent Diffusion Coefficient (ADC) values are calculated automatically by application software and displayed as a parametric map that reflects the degree of diffusion of water molecules through different tissues. The purpose of this study was to analyze the correlation between Diffusion-Weighted Magnetic Resonance Imaging (DWI) and Apparent Diffusion Coefficient (ADC) values with histopathology grading of brain tumors.

Material and methods: Pathology reports of intracranial tumor material were correlated with diffusivity of the tumor, and the ADC values, performed within 2 years of post-operative histopathology study. A freehand closed ROI out-lined the whole visible tumor on the most representative slice of ADC maps defined as the slice with the maximum diameter of the solid neoplastic component. ADC values were taken from 2 averages of 2 ROIs. Spearman Correlation test was used to assess the correlation between ADC values with the malignancy grading of the tumor.

Result: Low-grade malignant tumors show facilitated diffusion with high ADC values, and high-grade malignant tumors show restricted diffusion with low ADC values. The mean ADC value of Grade I tumor is 1.0799 ± 0.2356 x 10−3 mm2/sec and the mean ADC value of Grade IV tumor is 0.6798 ± 0.23729 x 10−3 mm2/sec. The Spearman correlation test between ADC value and histopathology result shown r = -0.536 and p=0.000 and the test result for ADC value and DWI shown r=-0.706 and p=0.000 (Sig. 0.05).

Conclusion: There was strong correlation between DWI and ADC values with histopathology grading of intracranial tumors.
Snedds (Self-nanoemulsifying Drug Delivery System) Formulation of Sarang Semut Extract on Cervical Cancer Cells (HeLa) with MTT Assay Method
Authors: Nugroho B H , Syifaudin M R , Fauzi L R , Anggraini E , Ritonga H O 
Published: January 2020

Abstract

Sarang semut (Myrcomedia pendans) is traditional medicine plant that has been widely used as alternative treatment for diabetics and cancer. Flavonoids in sarang semut ectract known as active copounds for pharmacology activity, and it has low solubility in water. The methods can be used to improve the availability of water-insoluble compounds for better to deliver the active compounds into the body is SNEDDS (Self –Nanoemulsifying Drug Delivery System). The purpose of this study is to get the formulation and characterized of SNEDDS of sarang semut. The parameters used were particle size, polydisperse index (PI), zeta potential. The results showed capryol 90 as oil vehicle, tween 80 as the surfactant, and propylene glycol as co-surfactant, and particle size is 12.53 nm, the polydisperse index is 0.27 Ð and value of zeta potential is -51, 43 mV. Physical stability of the three formula has shown good results. MTT Assay test results obtained with an amount of 258.755 ppm and 389.955 ppm are included in the range of toxic enough for IC50 is in the range ≤ 1000 ppm. The results obtained show that the sarang semut SNEDDS have good physical and chemical properties, has good organoleptic and have an inhibitory effect on the activity of Hela cells.
The Effect of Additive Substitute of MgO Nanoparticle on the Characteristics of Exports as Bone Filler
Authors: Izak Rudyardjo Djony , Wijayanto Setiawan 
Published: January 2020

Abstract
Research has been conducted on the effect of adding MgO nanoparticle additives to the characteristics of porous hydroxyapatite as bone filler. The purpose of this study was to optimize previous research by replacing the ZnO nanoparticle additive with MgO nanoparticles accompanied by the use of the injection method. Porous hydroxyapatite synthesis is carried out by mixing nano-sized hydroxyapatite powder with MgO nanoparticles and making PVA solution. The composition of MgO nanoparticles varied at 8 wt%, 10 wt%, 12 wt% and 14 wt%. The hydroxyapatite-MgO mixture is dissolved in PVA solution so that the hydroxyapatite slurry is formed. Polyurethane foam is prepared with dimensions of 1 cm × 1 cm × 1 cm. Hydroxyapatite slurry is injected into polyurethane foam and followed by thermal treatments. The thermal treatments process was carried out in 3 stages, the drying stage at 80ºC for 2 hours, the phase of removal of PVA and polyurethane foam by heating in a temperature of 650ºC for 1 hour, and the sintering stage at 1200ºC for 3 hours. The effect of variations in the addition of MgO nanoparticles additives to the porous hydroxyapatite produced was characterized using porosity test, compressive strength test, morphological test with SEM, functional group test with FTIR, and cytotoxicity test using MTT assay. Based on the analyzes that have been done, it is known that the porous hydroxyapatite sample with the addition of 14 wt% of the MgO nanoparticle additive shows the best character with a porosity percentage of 68.60%, compressive strength value of 2.43 MPa, pore size of 100.3 - 314.3 µm, and not toxic.
Enhancement of Dye Sensitized Solar Cell Efficiency Using Chlorophyll as Dye Sensitizer by Adding The SnO2Material to TiO2
Authors: Puspitasari Nurrisma , Rabi’atul Adawiyah Siti , Noer Fajar Muhammad , Yudoyono Gatut , Prajitno Gontjang , Rubiyanto Agus , Endarko  
Published: January 2020

AbstractDye-Sensitized Solar Cell (DSSC) is the third generation of solar cells. DSSC is formed by sandwich structure, there are five parts: ITO glass (Indium Tin Oxide) as the substrate; TiO2and SnO2as semiconductor material; natural dye from chlorophyll as an electron donor; gel electrolyte as electron transfer and active carbon as a catalyst in the counter electrode. The synthesis of nanometer-sized TiO2powder is obtained by coprecipitation method. The layer of TiO2was deposited on top of an ITO glass by doctor blade method. From the research, the DSSC efficiency has increased by nearly 100% after additions SnO2to TiO2. The DSSC efficiency result is 0.05% for DSSC before additions and 0.1% after additions
Design Monitoring Electrical Power Consumtion at Computer Cluster
Authors: Alfianto Enggar , Agustini Siti , Muharom Syahri , Rusydi Febdian , Puspitasari Ira 
Published: January 2020

Abstract
Electricity is one of the basic needs in the era of technological development, where all equipment must use electricity to operate such as computer, so that it requires a system that can monitor power consumption at computer cluster. To monitoring power consumption using WCS1800 to current sensor and microcontroller Atmega32 to data sensor process, and serial communication to send data to display at personal computer. From test system having two result, first is power consumption at computer cluster starting, where current value range is 0 to 38A with power consumption is 0 to 8360 watt. And second is power consumtion at computer cluster execution progran, current value is 27 to 40 A, with power consumption 5940 to 8800 watt. From this system has been design, the power consumption at computer cluster can be monitored and known value of energy consumption.
Analysis of Urban Points of Interest and Urban Traffic from Shenzhen Urban Space Optimization
Authors: Wang Yang , Xu Liquan 
Published: January 2020

Abstract
This paper is to discussing traffic accessibility and point of interest spatial network on the relationship between urban point of interest and the urban road network, First, we introduced the distribution of POI (points of interest, such as business, banking, catering, and attractions), and determining the road traffic and accessibility of cities through urban map data. Secondly, the spatial network formed by the POI is used to find the main factors, analyze the correlation between road traffic density and the road traffic density. Finally, the GIS platform is used for data organization for system analysis, mining urban data to obtain feature factors, and urban space optimization strategy. The studies results show urban POI affect road traffic through functional attributes, leading to changes in urban space.
Management by objectives: the Puerto Princesa Underground River, Palawan Philippines
Authors: Acero L 
Published: January 2020

Abstract
Puerto Princesa Underground River (PPUR) was proclaimed as national park in 1971 and included in the seven wonders of nature in 2012. It is located in the West coast of Palawan Philippines and north of Puerto Princesa City, Palawan Philippines. The underground river is the longest navigable river with a unique karst environment, home for endangered and endemic flora and fauna is a must see destination for tourists. Its management is unique, since it is manage by the city government and the Protected Area Management Board. The objective of this study is to describe and assess the activities done by the management in terms of its objectives as national park which is divided into three categories as; primary (genetic diversity, environmental services and tourism and recreation), secondary (scientific researches. Wilderness protection, and natural features and education) and tertiary (sustainable use). Documentary analysis, actual site immersion, interviews and focal group discussion were employed to gather pertinent data for this study. Result showed that the unique management of PPUR had done several activities in consonance with its objectives as national park. Activities done is geared on keeping the balance between community-driven protection and conservation of the park’s ecological integrity, its Outstanding Universal Value, and inclusive development through Transformative Tourism activities. Community empowerment had transformed the lives of residents in PPUR without prejudicing the environmental sustainability of the park.
Morphodynamics of river and coastal transport of sediments in mega delta basin, Niger Delta Nigeria
Authors: Okpara D A , Offiong M B 
Published: January 2020

Abstract
Niger delta is recognized as the third mega deltas in the history of mankind. Understanding the sediment dynamics and morphodynamics relationship between the morphology of the bedrocks to the hydrodynamic of its transport sediments is crucial for water bodies’ preservation, conservation, and sustainability. Sediments transportation in Niger delta involves a two-phase flow system in which one phase is considered to be fluid and the other phase is solid. The water bodies is seldom saturated with sediments occasioned by irregular solid waste dumps, erosions debris, and transported at ease without any form of management or control for many years now. Consequently, poor water resources, agriculture and fishery production are at extreme lost as sediment transport and deposition influences great magnitude of useful river dynamics. Therefore, the objective of this study is focused on whether sediment transport has an effect on the morphology of the channel in the Niger Delta basin. It is necessary to determine the relationship between these two key variables; Sediment yield and channel morphology. A correlation matrix was generated in MS Excel to determine the underlying relationship between the variables under study with a coefficient of determination of 11.23% and a positive correlation between suspended sediment yield, bed load and channel morphology of +0.345. The paper will be useful to research institutions, water resources agencies, government and environmental experts and engineers.
The curing characteristics and tear properties of phenolic resin on chloroprene rubber vulcanizate
Authors: Mayasari H E , Wirapraja A Y 
Published: January 2020

Abstract
Chloroprene rubber (CR) is synthetic rubber widely used for seal, joint, and also adhesive. For making rubber product, additives are needed and it can influence the properties of vulcanizates. This study aims to determine the curing characteristics and mechanical properties of chloroprene vulcanizate. The chloroprene vulcanizates were prepared by compounding with the two-roll mill and vulcanizing with the hydraulic press. Phenolic resin used as additives were varies i.e: 0, 10, 20, and 30 phr. The curing characteristics of the CR vulcanizates were studied by rheometer at 140 °C, 150 °C, and 160 °C. The tear properties of the CR vulcanizates were studied by tensile strength tester. The phenolic resin improves the mooney viscosity, scorch time and optimum curing time. The compound without phenolic resin gives the highest mooney viscosity and optimum curing time. The 10 phr phenolic resin give the best mooney viscosity, optimum curing time, constant rate, activation energy and also tear strength. The suitable curing temperature for CR compound is at 150 °C and the proper additive for CR vulcanizate is 10 phr phenolic resin.
An analysis of characteristic of Asphalt Pen 60/70 mixed with gilsonite additive
Authors: Kusuma Y , Fikri H , Sianturi F N M 
Published: January 2020

Abstract
The increase of the population growth in Indonesia causes an increase of the traffic volume on the road. With the increase of the traffic volume, it is necessary to improve the quality of the road construction, especially from the pavement layer quality. On the road that have moderate traffic volume to high traffic volume, several problems in the pavement layer are often found. One way to decrease the road damage is by improving the quality of the asphalt mixture, which means increasing the asphalt quality. The research design is conducted by testing the characteristic of Asphalt Pen 60/70 and also the Asphalt Pen 60/70 mixed with gilsonite additive at 4.5%; 5.5%; 6.5%; 7.5%; and 8.5% of the asphalt weight. The Asphalt Pen 60/70 mixed with the gilsonite additive is called as the modified asphalt. Based on the testing results, it is obtained that the characteristic of modified asphalt has a better asphalt characteristic than the Asphalt Pen 60/70. The percentage of gilsonite level that still meets all the modified asphalt requirements is at the percentage of 6.5% with ductility value >140 cm, 336°C flash point, 54.5°C softening point, 1.037 gravity specific, and 41 penetrations. Besides, the 7.5% and 8.5% gilsonite levels have better asphalt characteristic than the Asphalt Pen 60/70.
Analysis of bridge structure with non-linear time history method
Authors: Kamal R F , Gunadi R 
Published: January 2020

Abstract
Bridges in Indonesia, which built before the last standard SNI 2833:2016 was issued, need to be reviewed to ensure the safety against earthquakes. This study employs non-linear time history analysis as method to analyze and evaluate the bridge structure due to earthquake loads. The structure undergoes a test with earthquake loads from seven records of scaled acceleration ground motion. From the analysis result, scale adjustment of seven earthquakes records towards the target spectrum response demonstrates various effects on plastic joints scheme and earthquake damage values. The evaluation result based on Cisomang highway/toll-bridge analysis denotes that Response modification factor value (R) is within the limit of permitted value of SNI 2833:2016 standard.
Experimental study of bearing capacity pile foundation on peat soil by properties improvement using electrokinetic method and clamshell
Authors: Rabiya R , Syahril S , Somantri A K 
Published: January 2020

Abstract
Problem always arise when building infrastructure is located on peat soil, such as on a settlement bridge. To know this, an experimental test was conducted. From experimental testing, the PT00 model had the biggest drop at 87.16 mm, for the PT-25V model was 65.30 mm and the PT-KK-25V model amounted to 67.23 mm. For the model of PT00 experienced a faster settlement and small load is 37 kg, model PT-25V can withstand the load up to 49 kg, while for the model PT-KKK-25V, the pile foundation can afford the load up to 204 kg. The peat soil with pile foundation undergoes the fastest decrease of 52.25 mm on the PT-KKK-25V model. For PT00 and PT-25V models subjected to a smaller decrease process of 38.8 mm and 28.78 mm. The results of this analysis can be concluded that for the test pile foundation pressure. The aplication of improvement is more effective on the model PT-KKK-25V, namely pile foundation model is mixed 8% optimum contain of clamshell and electrokinetic with a voltage of 25V. However, for the pile foundation tensile testing, the application of modelling is more effective on the PT-25V type. Because electrokinetic can enlarge the tensile force of the pile foundation.
The 3-dimensional arcade game application of Khalid ibn al-Walid
Authors: Fathoni K , Nurhadi H A T , Hakkun R Y , Asmara R 
Published: January 2020

Abstract
Khalid ibn al-Walid was a hero of Islam who was very meritorious and inherited many exemplary values, namely sincerity, struggle and intelligence. But many people don’t know this hero. This is due to the widely available media introduction of Khalid ibn al-Walid figures such as history books and comic books that are less interesting. This can be overcome by developing an interactive historical game Khalid ibn al-Walid. This game is built with 3D characters using the arcade genre and the First Person Shooter viewpoint. There are 4 parts in this game namely Prologue, Phase Before Islam, Islamic Phase, Epilogue. The test results show that all game features can work properly. Then the game was tested on 10 users and they stated that they had received adequate information about Khalid ibn al-Walid from this game.
Study of comparison of tail wind turbines in wind power plants
Authors: Yulianto Y , Mandayatma E , Priyadi B 
Published: January 2020

Abstract
The windmill tail that is widely used is a single tail that has a performance of a large zero offset. This study is to get a windmill tail pattern with a fast response and good direction stability. The aim of this study is to obtain a windmill tail pattern with the most stable direction stability under load conditions and changing wind direction by comparing the stability of several alternative windmill tail patterns. The process of data collection is done by comparing the performance of 3 types of windmills: single tail, semi-differential tail, and differential tail. The variables are speed of wind direction, speed of change of wind direction, differential angle of zero offset error, speed of change of direction, and torque produced. The material obtained from the test results was transcribed and analysed. The results of the analysis are used to design windmill tail prototypes. From the analysis results show that the swing torque at the differential windmill tail is proportional to the sinusoidal swing angle, the differential angle gives the effect of the torque scale in a cosine manner. Whereas on a single pinwheel produces torque proportional to the sine squared with respect to the swing angle. The differential tail has performance with better speed and stability, but produces vertical vibrations so it is preferable to use a semi-differential pinwheel with a differential angular size tuned in the system.