bluuebunny/crossref_metadata_2025 huggingface dataset:
Unconfined compression strength of soil using silica sand waste and dust sand foundry as a stabilizer
Authors: Gunarti A S S , Nuryati S , Muttaqin P A , Raharja I
Published: May 2020

The need to improve the subgrade of a highway becomes urgent when the vehicle load exceeds the carrying capacity of the soil. Industrial waste, that increase every day, was proposed in this study as an additive or stabilizer to improve the carrying capacity of the subgrade. Testing was done through laboratory experiments of the mixing original soil with Silica Sand waste and Dust Sand Foundry waste in certain compositions. To test the mechanical properties, the Unconfined Compression Strength Test based on ASTM standards was conducted. The unconfined compression strength (qu) value of the original soil was 0.289 kg/cm2. The highest qu value was shown in the composition of the soil mixture with 2.5% SS and 7.5% DSF which was 0.347 kg/cm2. The qu value increased by 20.07% from the qu value of the original soil, and showed a mechanical improvement in stabilizing soil.
Probabilistic stability and sensitivity analysis of rock slope subjected to seismic loading
Authors: Farichah H , Hutama D A
Published: May 2020

Being located on the Pacific Ring of Fire, Indonesia has to cope with the constant risk of earthquakes which often trigger landslides in mountainous area, causing significant and even catastrophic damage. This paper presents probabilistic stability and sensitivity analysis of rock slope subjected to seismic loading based on Generalized Hoek-Brown failure criterion. Two approaches namely Limit Equilibrium Method (LEM) and Finite Element Method (FEM) were utilized using computer programs of Rocscience Slide and Phase2, respectively. The Generalized Hoek-Brown parameters such as, σci, GSI and mi were distributed normally with their coefficients of variation (COV) of 0.25, 0.125 and 0.1, respectively. The different seismic loadings expressed as Kh of 0.1, 0.3, and 0.5 were then subjected to the rock slopes and the probability of failure (Pf) was evaluated for each slope. Eventually, the results of Pf obtaining from LEM and FEM were compared and the most decisive parameter in slope stability were evaluated in sensitivity analysis. Based on the presented results of the analysis, the probability of failure (Pf) of the rock slopes which are subjected to the seismic loading generated by both FEM and LEM will decrease as the mean of GSI, σci, and mi increase. Moreover, the increment of the D value and seismic loading will induce the probability of failure (Pf) of the rock slopes which are generated by both FEM and LEM increase.
Comparative study of the use of FWD and LWD for flexible pavement evaluation
Authors: Siegfried  , Mulyawati F
Published: May 2020

Falling Weight Deflectometer (FWD) is the standard equipment used for the analysis and evaluation of flexible pavement. The number of this equipment is very limited in Indonesia. For a country owned 48,000 kms of road it is quite important to have an alternate equipment of FWD. Institute of Road Engineering (IRE) has performed the Light Weight Deflectometer (LWD) for the use in low to medium traffic roads for both evaluation and design of overlay. The study has done to compare these two equipment focusing on three parameters i.e Effective Structural Number (SNeff), Surface Modulus (Sm) and prediction of Subgrade Modulus (Esg). There are 15 points tested using FWD and LWD nearly in the same time on the IRE campus that is classified as low traffic volume road. Each point is then analysed to calculate SNeff, Sm, and Esg using the deflections derived from both of FWD and LWD tests. The analysis is done by plotting the parameters calculated from deflections derived from each equipment and then plotting each other. It is found that the plotting fall around the line of equality. This finding goes to the conclusion that the use of LWD of IRE version is acceptable to be used for the analysis of the flexible pavement especially for low to medium traffic.
The effect of waste treatment on greenhouse gas reduction and final disposal site (TPA)
Authors: Sunarto  , Sulistyaningsih T , Jainuri  , Salahudin
Published: May 2020

This paper aims to determine the effect of waste management on the reduction of greenhouse gases that relies on end-of-pipe disposal elements. The analysis of this study uses the application of dynamic systems. This study places that the waste management system is not by following the volume of waste generated growth, the availability of resources, environmental conditions in certain social areas, and the increase in gas emissions will continue to increase along the volume of waste. Also, by using a quantitative approach, it was concluded that in general, open-dumping waste does not follow the rules of sanitary landfills. There is no gas collection and processing system so that it pollutes the atmosphere, and the absence of leachate collection and processing systems results in soil pollution and surface water. Greenhouse Gas (GHG) emissions from the waste sector can be reduced by implementing waste treatment by recycling. Waste recycling has been carried out by the community and the City of Sanitation and Landscaping Office (DKP) of Malang City by increasing its capacity, GHG emissions can be reduced by 85.15% of GHG emissions in the initial conditions.
Rock slope stability analysis using Slope Stability Rating (SSR) method
Authors: Botjing M U , Janat N R , Hilmansyah T , Asrafil  , Saing Z
Published: May 2020

Nupabomba village roads frequently undergo landslides, so that detain transportation access flow pattern as a result of rock slope stability problem, which has become the landslides trigger. Furthermore, to find out landslides prone area slope stability level, an analytical study using a scientific approach is required to reveal this question in the study area. The slope elevation in this area is ± 75 meters, with an average slope angle of 60°, where its lithology consists of Schist, Greenschist, Filite, and Granite. Some of these rocks have different weathering levels (e.g., slightly - high weathering), and there are lots of discontinuity. Moreover, its geological strength index (GSI) value showed around 15-75 with the surface shape of blocky and disturbed. Besides, the uniaxial compressive strength (UCS) value was obtained based on the compressive strength carried out in the field, and slope stability rating (SSR) values have gained the range of 9-81.
Optimization formula of fast disintegrating tablets Ketoprofen β-cyclodextrin inclusion complex with sodium starch glycolate and crospovidone as the superdisintegrants
Authors: Hidayati N , Sulaiman T N S , Nurhaini R
Published: May 2020

Ketoprofen has low solubility in water with unpleasant taste. Efforts to improve solubility and taste are by forming inclusion complexes using β-cyclodextrin. In its development to release Ketoprofen quickly, fast disintegrating tablets (FDT) were prepared. The speed of drug release is influenced by the speed of disintegration tablets. The combination of sodium starch glycolate (SSG) and crospovidone (CP) combines swelling and wicking action which speeds up the disintegration of tablets. This study aims to obtain the optimum value of the combination of both in order to obtain FDT with optimum evaluation parameters according to the requirements. The study made 8 run FDT directly with variations in the concentration of SSG 2–8% and CP 2-5%. Evaluations carried out at each run included flow velocity tests, uniformity of preparation, hardness, friability, disintegration time, wetting time and dissolution. Data were analyzed using simplex lattice design method. The optimum formula predicted results are verified by analysis of one sample t-test. The results showed increasing the proportion of SSG increases hardness, disintegration time and wetting time and decreases fragility of FDT. The optimum formula found at combination of 2% SSG and 5% CP with optimum physical properties and percent release and sweet taste.
Risk factors analysis of constipation in patients with acute coronary syndrome
Authors: Zukhri S , Setianingsih  , Hastuti R Y , Setyaningsih I
Published: May 2020

Pathophysiologically, patients with the acute coronary syndrome (ACS) are at risk of constipation. This study was aimed to determine the relationship of age, fluid intake, fiber intake, use of sedatives, and mobilization status with the occurrence of constipation in patients with ACS in intensive care unit (ICU). Thirty ACS patients (21 male and 9 female, aged 45 to 74 years who were treated in the ICU of PKU Muhammadiyah Delanggu Hospital, Klaten, Indonesia, in November - December 2018, were observed for 3 consecutive days from the initial admission to ICU. Data were analysed with the binary multiple logistic regression tests at 95% confidence level. Multivariate analysis showed that fiber intake (p=0.025, RR=26.675, CI 95%= 1,498-474.996), fluid intake (p=0.044, RR=21.332, CI 95%= 1,093 –416.328) and immobilization (p= 0.012, RR = 15.466, 95% CI =1.068-349.989) were significantly correlated to the occurrence of constipation with Negelkere R2 = 0.80, whereas age and used of sedative were not. It was concluded that lack of fiber intake, lack of fluid intake, and immobilization were the risk factors for the occurrence of constipation in ACS patients and contributed of 80.3% the occurrence of constipation in ACS patients, whereas of 19.7 % influenced by other factors were didn’t study in recent research. However further research needed to be done with a larger of sample size.
Spectrum properties of self-adjoint operator
Authors: Ekayanti A , Indrati C R
Published: May 2020

In this paper, we discuss about spectrum properties of self-adjoint operator. Relation between self-adjoint operator and normal operator is used to show that the spectrum of self-adjoint operator is subset of ∝. Furthermore, by using norm properties of bounded-linear operator and real polynomial we derived the relation between spectrum and norm of operator polynomial.
Edutainment with video scribe in thematic learning
Authors: Shalikhah N D , Mardiana ANDT
Published: May 2020

A teacher is required to be able to create a conducive learning situation, fun and can motivate students that will have a positive impact in the achievement of learning outcomes. Specific objectives from this research are 1) applying the edutainment-based learning model with video scribe on thematic learning at MI Muhammadiyah Rambeanak 1 Magelang Regency; and 2) packaging a scientific approach in the form of the observing, asking, trying, analysing, and communicating method in thematic learning can be carried out through video scribe. The long-term goal of this research is to improve the quality of elementary school. The data collection of this research are document studies, observations, interviews, forum group discussion, and questionnaires to find out students’ opinions. The results of this study are 1) creating an edutainment atmosphere in thematic learning using video scribe which is seen from the results of the student opinion questionnaire which states 82.3% pleasant atmosphere, 83.3% conducive learning environment, 81.4% attracts interest, and 79.6% involves all the senses and mind; and 2) thematic learning using a scientific approach in the form of the observing, asking, trying, analysing and communicating method can be carried out through video scribe.
CFD analysis of vertical axis wind turbine using ansys fluent
Authors: Afif A A , Wulandari P , Syahriar A
Published: May 2020

Renewable Energy Resources are increasing in a few years, this is due to the increasing increase in environmental pollution and fossil fuels which are increasingly depleted. Both bridges and toll roads actually have wind speeds that can be used and used as electricity. But there is a problem to put the power plant on the bridge or the toll road, which is quite limited land, so to install the Horizontal Axis Wind Turbine will be very difficult. Therefore, Vertical Axis Wind Turbine is used as an alternative. VAWT is used to create power plants that can use wind from vehicles on toll roads and bridges to make electricity. To be able to take advantage of the wind around the place, Computational Fluid Dynamics (CFD) is needed to optimize the design of the turbine.
West Java tourism geographic information system design using adobe AIR
Authors: Suhendi  , Rahmah A
Published: May 2020

Google can be maximized with applications that can facilitate the direct location of tourist destination. The introduction of problem is no West Java tourism application using Adobe Flash, so the researchers take the theme Designing West Java Tourism Geographic Information Systems Using Adobe AIR. The purpose of this study is to assist the government and people in Indonesia using mobile application to reduce time efficiency in finding tourist location maps and information about tourist attractions in West Java and as the places to help tourists. The application will increase the regional income to visit attractions / tourism in West Java. The research methods carried out in this study use the Rapid Application Development method. The most important process is planning, user design, construction, and cutting needs. The design steps to create a navigation menu consisting of maps of West Java that can be connected directly with GPS and google maps. The next stage is the development with a combination of action script 3 programming, images, and the export process to the apk file. The testing process is done using a cell phone that is connected to GPS and has been installed on Google Maps and Adobe AIR. Conclusions obtained by the application successfully designed with 100% test results successfully run on android-based mobile devices.
Android based learning application for Wudhu and Tayamum using augmented reality technology
Authors: Dewi S P , Astuti I P , Buntoro G A , Widaningrum I , Yusuf A R
Published: May 2020

Nowadays, wudhu and tayamum are widely found in various media such as books, articles, tutorial videos and internet. Muslims who are new to Islam as children often have difficulty reading books to understand how to learn and practice tayamum, one of the lessons learned in technology development using Augmented Reality based learning. The learning method used in Augmented Reality is the marker method. The marker method step is that the program will read an object from the image marker, the marker uses a downloadable image by clicking the Download Marker button in the main menu, and then it will be displayed as a moving object or an output in the data. This app is implemented for Android-based smartphones, with the help of Blender 3D and Unity 3D software. The results of the questionnaire count conclude that augmented reality learning media applications are easy to use, practical, useful, and effective in supporting children’s learning activities as children become more engaged in learning. The attractive interface design makes kids feel comfortable and engaging as they use it and develop their understanding. In addition, this application is also used as an interactive learning medium.
Usability evaluation of university website: a case study
Authors: Sukmasetya P , Setiawan A , Arumi E R
Published: May 2020

Web-based public services become an important part in supporting the success of a university, but there are still many difficulties to use it. This study was conducted to evaluate whether Muhammadiyah Magelang University website has had the acceptability criteria of usability testing. The study was conducted using a questionnaire as a research instrument that consisted of 17 questions and filled by 95 respondents. Those questions grouped into five variables usability, there are learnability, efficiency, memorability, error, and satisfaction. Based on analysis, the result said that the mean score of overall usability testing to measure website usage Muhammadiyah Magelang University website was 2.77, for each variable the Learnability aspects have the overall score of 2.83, the efficiency was 2.73, memorability was 2.82, an error was 2.65 and 2.79 for satisfaction by respondents. From these results indicate that the website of Muhammadiyah Magelang University already Quite Easy to use. However, there are still many things that need to be fixed, especially in case of errors, focused on the availability of the feature and efficiency aspect in the speed of accessing the feature for getting information.
Development of learning material of integer and fractions based on interactive multimedia with Islamic values
Authors: Ahmad J , Handayani I I , Rizki S
Published: May 2020

The objective of this study was to produce learning material of integer and fractions based on interactive multimedia with Islamic values that valid and practical. The type of this research was Research and Development (R & D). The model used 4D (Define, Design, Development, and Disseminate). The research subjects were 10 students of Junior high school of Muhammadiyah 1 Metro. The instruments used expert validation assessment questionnaires to determine the feasibility of the product and questionnaire responses of students to find out the practicality of the product. The results of the percentage analysis of expert validation were obtained on average, that is, 83.54% with very feasible categories. As for the results of the students’ response trials, the average percentage was 87.41% with a very practical category. Therefore, it can be concluded that learning material of integer and fractions based on interactive multimedia with Islamic values were very valid and practically used for learning.
Preliminary design and soil moisture sensor yl-69 calibration for implementation of smart irrigation
Authors: Setyowati I , Novianto D , Purnomo E
Published: May 2020

Smart irrigation as one of implementations of the Internet of Things (IoT) in agriculture aims to control and monitor water supply in accordance to crop needs. The control systems are designed using the Arduino Nano platform and the soil moisture sensor YL 69. The accuracy of the sensor is very influential on the performance of the control system, so that sensor calibration is done before it is applied to smart irrigation. The calibration method used in this research is the Gravimetric Water Content method. The media used in calibration is a mixture of soil and sand as Smart Irrigation as one of the implementations of the Internet of Things (IoT) in agriculture aims to control and monitor water supply in accordance to crop needs. The control system is designed using the Arduino Nano platform and the soil moisture sensor YL 69. The accuracy of the sensor is very influential on the performance of the control system, so that sensor calibration is done before it is applied to smart irrigation. The calibration method used in this research is the Gravimetric Water Content method. The media used in calibration is a mixture of soil and sand as much as 5% of the soil. Water weighed 4.71% from soil weight added to increase soil moisture level in calibration process. Based on the calibration results obtained from the sensor reading 201 shows 18.31% of soil moisture in dry soil. With nine times of water addition to soil obtained soil saturation point to water with sensor reading 633 which shows result 61.91% of soil moisture. The experimental results show the polynomial curve of order 3
Analysis of braking force efficiency measurements for various braking strategy applied for vehicle tested on roller brake tester
Authors: Firdaus R M , Supriyo B , Suharjono A
Published: May 2020

Roller brake tester is a kind of vehicle braking system test equipment to test the braking force for each vehicle axis and its efficiency. This study aims to analyze the vehicle braking force efficiency due to application of three different braking actions: sudden braking, gradual braking and intermittent press release braking, tested on the roller brake tester. The vehicle used for testing is a type of passenger vehicle weighing of about 1400 kg. The results show that the highest braking force efficiency of about 44% occurs when sudden-braking is applied, while for the lowest braking force efficiency of about 40% occurs when the loose-press braking is applied.
Preliminary sandstone reservoir depth prediction with pre-processing data using principle component analysis (PCA) and partial least square (PLS) based on well logging data attribute
Authors: Utami E , Purnomo M H , Rizki R F , Biyanto T R
Published: May 2020

Sandstones containing 60% of oil or gas because of porosity and permeability. The conventional method required sandstones predicted with complete data. This study used neural networks to determine the depth of sandstones and predict incomplete variables well site at the Sunda Strait-south area. Data pre-processing used PCA-PLS to find the most important variables that affect the output thus improving the prediction results. Multicollinearity analysis is used to determine the data compression needed. Raw data multicollinearity result showed that the multicollinearity occurs indicated with VIF over 10 and tolerance under 0.1 at CALI and SP variables. The PCA-PLS analysis uses to reduce data from 13 variables into six important variables namely DEPT GR RHOB NPHI ILD Peff, these results do not experience multicollinearity. The variable that predicted is ILD with the best ANN multilayer perceptron showed small standard deviation and standard error results 2.85 and 0.03. The best ANN model to predict the depth of radial basis sandstone is due to produce a regression test of 0.8 based on the results of the validation of the log image.
Catalytic isomerization of n-hexane over beta (BEA) zeolite by dry-gel convention (DGC) and hydrothermal (HTS) methods
Authors: Pusparatu  , Sugi Y
Published: May 2020

Catalytic Isomerization of n-hexane over Beta (BEA) zeolite synthesized by dry gel conversion (DGC) and hydrothermal (HTS) methods were studied. The isomerization was influenced by types of synthesized methods, and combined selectivity for branched alkanes (2- and 3-methylpentanes, 2,2-dimethylbutane, 2-, and 3-methylbutanes, 2,2-dimethylpropane, and 2-methylpropane) decreased in the order: BEA (DGC) > BEA (HTS). BEA synthesized by DGC had the highest activity and selectivity for the isomerization, and BEA Synthesized by HTS has the highest activity for cracking to lower alkanes and alkenes. These differences are ascribed to the difference of surface area, pore volume, acid properties, and reaction parameters.
Implementation of the level of detail method on augmented reality android-based applications
Authors: Syaputra R A , Widiyanto A
Published: May 2020

Many 3D games and applications use augmented reality technology in smartphones. When an application or game is running, it will increase The Workload of The Processor which is signed by the heat of The Smartphone. The processor and battery temperatures increase due to heavy workload of processor. This study uses the Level of Detail-method to reduce the detail of 3D objects from the Augmented Reality application. 3D objects that appear on the smartphone screen are adjusted to the distance of the camera to the marker. The distance of the camera to the marker triggers the change of details so that the processor workload decreases. The test results show that the average Workload Processor is reduced by 10,47% and the temperature decreases by 0.94°C.
Blog-based mathematics learning devices
Authors: Ismail  , Fitriani  , Takdir  , Sudirman P , Umar
Published: May 2020

The development of science and technology today requires learning science and technology-based innovation. Educators must be able to innovate learning by utilizing the internet. Blog-based learning is important as an alternative learning. The purpose of this research is to produce a valid, practical and effective blog-based mathematics learning tools developed consist of RPP, Modules, and the Mathematics Learning Blog. This research is a research developed. The development model used is the ADDIE model (Analyse, Design, Development, Implementation, Evaluation). The subject of the research was grade X students. Based on the results of the development it was obtained that the result of blog-based mathematics learning that were developed met valid, practical, and effective criteria.
Real time optimization of low temperature shift converter of carbon monoxide in an industrial ammonia plant
Authors: Agnesty S Y , Niam H H , Wahyudi M A , Yulyana M , Sriana T
Published: May 2020

The main goal of this work is optimize low temperature shift converter (LTS) of Carbon Monoxide (CO) in an Industrial Ammonia Plant considering life time of the catalyst in that converter. Shift converter is a reactor to convert CO into carbon dioxide. CO in ammonia plant comes from steam reforming process that convert natural gas into hydrogen gas. This process will also produce CO gas, where CO gas is toxic to the catalyst in ammonia syntesis reactor and also able to oxidize Fe in ammonia synthesis that is the reason why CO is one of component that can interfere the ammonia gas manufacturing process. To prevent this, the CO gas purification process needs to be done, one of the method is using shift converter process. From the optimization of several operating conditions in low temperature shift converter, a relatively strong correlation is found between flow rate feed and average temperature bed catalyst with the lifetime of the catalyst. The optimization result show that the optimum flow rate feed in LTS is 2754.49 m3/day and average temperature bed catalyst is 224°C. Operating at the proposed optimal condition increases life time of the catalyst about 8.02% per year.
Coastal environment baseline on Seloko Island, Batam City, Indonesia
Authors: Mubarak  , Badrun Y , Retnawaty S F
Published: May 2020

Seloko Island will be made part of the Batam Island industrial area. This will have an impact on environmental conditions on the island. The purpose of this study was to determine the general condition of the Seloko Island ecosystem. Observed environmental components included: water quality, sediments, mangrove vegetation, seagrass, coral reefs and sediments. The results showed Dissolved oxygen concentrations ranged from 6.5 to 73.3 mg/l; PH ranged from 7.5 to 7.9; Salinity averaged 33.3‰; temperatures ranging from 29.8-30.4°C. Sedimentation, dominant sand. Mangrove diversity consists of Avicennia Alba, Sonneratia alba, Rhizophora apiculata, Rhizophora mucronata, Rhizophora stylosa, Bruguiera gymnorrhiza, Xylocarpus granatum, and Nypa fruticans. Seagrass cover ranges from 0 to 2.75% with one species, Enhalus acoroides, which describes the condition of seagrass that is not good. Cover of coral reefs ranged from 0 - 0.67%, which illustrates the condition of corals that are not good.
Calibration of pH and oxygen sensors applied to aquaponic system
Authors: Novianto D , Prajoko S , Setiyowati I , Purnomo E
Published: May 2020

Majority of agricultural activity in Indonesia still relies on rainwater for irrigation. In the dry season, there are many non-productive agricultural lands. It leads to decrease in farmers’ income. To solve this problem, Aquaponic Planting System was offered, but the system is complicated. It needs adequate oxygen and proper pH to make nitrification bacteria alive to convert NH3 to NO3- and NO2. Therefore, a system which controls oxygen and pH is needed. For pH calibration, a curve fitting method was used to get an accurate measurement. For oxygen calibration, saturated dissolved oxygen water was used. It was obtained using a Potentiometric method. Moreover, Simple Moving Average was used to get a stable reading.
Decision support system for determining thesis supervisor using analytical hierarchy process (AHP) method
Authors: Arumi E R , Setiawan A , Primadewi A
Published: May 2020

The determination of lecturers is important to facilitate the selection of lecturers in accordance with lecturers’ expertise and titles proposed by students. Currently, the assignment of determining the thesis supervisor is usually determined by the Head of Study Program, in the process of determining still using a conventional way by relying on personal knowledge. Often occurs less than an optimal decision, where the appointed lecturer, the field of expertise is less precise with the title of the proposed student thesis. Based on the above problems, it takes a solution that can consider the field of lecturer expertise in accordance with the criteria for determining lecturers, lectured subjects, conformity of thesis title topics, and duration of guidance. Data is processed from Google Scholar extraction, Letter of Decision of teaching each semester, student thesis title submissions, long guiding students, followed by Analytical Hierarchy Process (AHP) method, highly effective and structured method. The result obtained by the largest eigenvector value is 32% means that the proposed title of the proposed thesis is the variable that has influence on the determination of the lecturer, followed by the lecturer’s research interest with 30%, the lecture taught by the lecturer with 28% and the last criterion determine the supervisor is the old lecturer has guided by 8%.
A case study on possible radiological contamination in the Lo Uttaro landfill site (Caserta, Italy)
Authors: Ambrosino F , Stellato L , Sabbarese C
Published: May 2020

The prevention of radioactive pollution is a primary objective of environmental protection codes in the operation of solid waste landfill activities. Several studies have demonstrated the effectiveness of radiological monitoring of the main constituents of urban landfill waste. The present contribution reports on an investigation plan carried out to evaluate the possible radiological contamination in the municipal landfill Lo Uttaro, district of Caserta (Italy). The investigation focused primarily on the perimeter area of the landfill in order to assess the possible impact on the surrounding population. The results of measurements of the equivalent dose rate along the perimeter of the landfill show average values lower than the population dose limit due to natural background radiation. Several samples of soil, groundwater and leachate representative of the subsoil of the study area were collected and the radionuclides were measured by gamma spectrometry. The results of these measurements show the absence of artificial radionuclides, except for small amounts of 137Cs due to nuclear disasters occurring in the last 50 years on Earth, and the mere presence of 40K and other natural radionuclides belonging to natural radioactive chains of 238U, 235U and 232Th.
Leaf water diffusion dynamics in vivo through a sub-terahertz portable imaging system
Authors: Girolamo F V Di , Toncelli A , Tredicucci A , Bitossi M , Paoletti R
Published: May 2020

The development of terahertz based technology has given the opportunity for the realization of non destructive techniques capable of gaining meaningful information on delicate systems such as biological samples. Here, the health status of leaves in vivo has been monitored through a portable terahertz imaging system. The data have been extracted and analysed from the images acquired and compared with analogous results reported in the literature on similar systems. The possibilty of extracting additional information from the images regarding leaf details has also been explored.
Tor vergata Synoptic Solar Telescope: preliminary optical design and spectral characterization
Authors: Calchetti D , Viavattene G , Berrilli F , Moro D Del , Giovannelli L , Oliviero M
Published: May 2020

Synoptic telescopes are fundamental tools in solar physics. They are tipically used for high cadence full-disk observations of the Sun at different wavelengths, in order to study the solar activity across the solar cycle. The TSST (Tor vergata Synoptic Solar Telescope) is a new synoptic telescope composed of a Ha filter-based telescope centered at 656 nm and a custom Magneto Optical Filter (MOF)-based telescope centered in the potassium (KI D1) absorption line at 770 nm. Observations of the Ha line are important for the detection of flaring regions and to track the Sun during the acquisition. The aim of the telescope is to monitor the solar activity using the line of sight (LoS) magnetograms and dopplergrams of the solar photosphere produced by the MOF-based telescope. Magnetograms are essential for the study of the geometry of the magnetic field in active regions, while dopplergrams can be used to study the dynamics of the solar lower atmosphere. In this work, we focus our attention on the custom MOF-based telescope. Firstly, we present the optical design of the instrument. It is a refractor telescope with a 80 mm aperture and an effective focal length of ∼1m. We also present details on the preliminary spectral characterization of this instrument at different cell temperatures, which is a mandatory step to calibrate magnetograms and dopplergrams. The results obtained during this first test are in agreement with the peaks separation (∼200 mÅ) and FWHM (∼ 50 mÅ) that we expected.
The QUBIC instrument for CMB polarization measurements
Authors: Mele L , Ade P , Alberro J G , Almela A , Amico G , Arnaldi L H , Auguste D , Aumont J , Azzoni S , Banfi S , Battistelli E S , Baù A , Bèlier B , Bennett D , Bergé L , Bernard J-Ph , Bersanelli M , Bigot-Sazy M-A , Bleurvacq N , Bonaparte J , Bonis J , Bottani A , Bunn E , Burke D , Buzi D , Cavaliere F , Chanial P , Chapron C , Charlassier R , Columbro F , Coppolecchia A , D’Alessandro G , Bernardis P de , Gasperis G De , Leo M De , Petris M De , Dheilly S , Dumoulin L , Etchegoyen A , Fasciszewski A , Ferreyro L P , Fracchia D , Franceschet C , Lerena M M Gamboa , Ganga K , García B , Redondo M E García , Gaspard M , Gayer D , Gervasi M , Giard M , Gilles V , Giraud-Heraud Y , Gómez Berisso M , González M , Gradziel M , Grandsire L , Hamilton J -Ch , Harari D , Henrot-Versillé S , Hoang D T , Incardona F , Jules E , Kaplan J , Kristukat C , Lamagna L , Loucatos S , Louis T , Maffei B , Marnieros S , Marty W , Masi S , Mattei A , May A , McCulloch M , Melhuish S , Mennella A , Montier L , Mousset L , Mundo L M , Murphy J A , Murphy J D , Nati F , Olivieri E , Oriol C , O’Sullivan C , Paiella A , Pajot F , Passerini A , Pastoriza H , Pelosi A , Perbost C , Perciballi M , Pezzotta F , Piacentini F , Piat M , Piccirillo L , Pisano G , Platino M , Polenta G , Prêle D , Puddu R , Rambaud D , Ringegni P , Romero G E , Salatino M , Salum J M , Schillaci A , Scóccola C , Scully S , Spinelli S , Stankowiak G , Stolpovskiy M , Tartari A , Thermeau J-P , Timbie P , Tomasi M , Torchinsky S , Tristram M , Tucker G , Tucker C , Viganò D , Vittorio N , Voisin F , Wicek F , Zannoni M , Zullo A
Published: May 2020

Measurements of cosmic microwave background (CMB) polarization may reveal the presence of a background of gravitational waves produced during cosmic inflation, providing thus a test of inflationary models. The Q&U Bolometric Interferometer for Cosmology (QUBIC) is an experiment designed to measure the CMB polarization. It is based on the novel concept of bolometric interferometry, which combines the sensitivity of bolometric detectors with the properties of beam synthesis and control of calibration offered by interferometers. To modulate and extract the input polarized signal of the CMB, QUBIC exploits Stokes polarimetry based on a rotating half-wave plate (HWP). In this work, we illustrate the design of the QUBIC instrument, focusing on the polarization modulation system, and we present preliminary results of beam calibrations and the performance of the HWP rotator at 300 K.
The penumbral solar filaments from the photosphere to the chromosphere
Authors: Murabito M , Ermolli I , Giorgi F , Stangalini M , Guglielmino S L , Jafarzadeh S , Socas-Navarro H , Romano P , Zuccarello F
Published: May 2020

The magnetic field structure of sunspots above the photosphere remain poorly understood due to limitations in observations and the complexity of these atmospheric layers. In this regard, we studied the large isolated sunspot (70”× 80”) located in the active region NOAA 12546 with spectro-polarimetric measurements acquired along the Fe I 617.3 nm and Ca II 854.2 nm lines with the IBIS/DST instrument, under excellent seeing conditions lasting more than three hours. Using the Non Local Thermodynamic Equilibrium inversion code we inverted both line measurements simultaneously to retrieve the three-dimensional magnetic and thermal structure of the penumbral region from the bottom of the photosphere to the middle chromosphere. The analysis of data acquired at spectral ranges unexplored allow us to show clear evidence of the spine and intra-spine structure of the magnetic field at chromospheric heights. In particular, we found a peak-to-peak variations of the magnetic field strength and inclination of about 200 G and 10° chromospheric heights, respectively, and of about 300 G and 20° in the photosphere. We also investigated the structure of the magnetic field gradient in the penumbra along the vertical and azimuthal directions, confirming previous results reported in the literature from data taken at the spectral region of the He I 1083 nm triplet.
The first flight of the OLIMPO experiment: instrument performance
Authors: Presta G , Ade P A R , Battistelli E S , Castellano M G , Colantoni I , Columbro F , Coppolecchia A , Alessandro G D’ , Bernardis P de , Gordon S , Lamagna L , Masi S , Mauskopf P , Paiella A , Pettinari G , Piacentini F , Pisano G , Tucker C
Published: May 2020

OLIMPO is a balloon-borne experiment aiming at spectroscopic measurements of the Sunyaev-Zel’dovich effect in clusters of galaxies. The instrument operates from the stratosphere, so that it can cover a wide frequency range (from ∼ 130 to ∼ 520 GHz in 4 bands), including frequencies which are not observable with ground-based instruments. OLIMPO is composed of a 2.6-m aperture telescope, a differential Fourier transform spectrometer and four arrays of lumped element kinetic inductance detectors operating at the temperature of 0.3 K. The payload was launched from the Longyearbyen airport (Svalbard Islands) on July 14th, 2018, and operated for 5 days, at an altitude of 38 km around the North Pole. We report the in-flight performance of the first lumped element kinetic inductance detector arrays ever flown onboard a stratospheric balloon.
Causal inference in space weather by an information theory approach
Authors: Stumpo M , Consolini G , Alberti T
Published: May 2020

The variability of the interplanetary medium and solar wind conditions strongly affects the near-Earth environment causing several phenomena, such as the magnetic storms and substorms. Here, we present some preliminary results on the causal inference in the solar wind-magnetosphere-ionosphere coupling by means of information theory which could be helpful for Space Weather modeling.
FRED: a fast Monte Carlo code on GPU for quality control in Particle Therapy
Authors: Simoni M De , Fischetti M , Gioscio E , Marafini M , Mirabelli R , Patera V , Sarti A , Schiavi A , Sciubba A , Traini G
Published: May 2020

Charged Particle Therapy is a non-invasive technique for radio-resistant tumor treatment performed with protons or light ions, aiming to deliver a high precision treatment. Compared to conventional radiotherapy, ions allow for a higher dose deposition in the tumor region while sparing the surrounding healthy tissue. To really exploit the potential benefits of this technique, the highest possible accuracy in the calculation of dose and its spatial distribution is required in treatment planning. Commonly used Treatment Planning Software solutions adopt a simplified beam-body interaction model. An alternative is the use of Monte Carlo simulations which explicitly take into account the interaction of charged particles with actual human tissues hence providing highly accurate results. However, Monte Carlo simulations are used in a restricted number of cases due to substantial computational resources required. The code FRED has been developed to allow a fast optimization of the treatment plans in Charged Particle Therapy while profiting from the dose release accuracy of a Monte Carlo tool. Currently, the most refined module is the transport of proton beams in water. A comparison with measurements shows that the lateral dose tails are reproduced within 2% in the field size factor test up to 20 cm. Models for the interaction of ion with the matter are currently under development in the FRED code. The status of new developments and the performance of FRED will be presented.
Silver doping effects on irreversibility field and pinning energy of a FeSe iron based superconductor
Authors: Galluzzi A , Buchkov K , Nazarova E , Leo A , Grimaldi G , Pace S , Polichetti M
Published: May 2020

We have performed DC magnetic moment measurements as a function of magnetic field m(H) and time m(t) on a FeSeo.94 and a silver doped FeSeo.94 + 6 wt% Ag. In particular, from the m(H) measurements, the field dependence of the critical current density Jc(H) of the samples has been extracted at different temperatures in the framework of the Bean critical state model. Starting from the Jc(H) of the samples, we have studied the influence of the silver doping on the temperature dependence of the irreversibility field Hirr(T) above which the pinning energy is so reduced that the vortices are free to move. The obtained Hirr(T) values have been fitted with the equation Hirr(T) = Hirr(0) (1-T/T*)n whose results have been compared with the literature. After that, we have analyzed the silver doping effects on the field dependence of the pinning energy U(H), extracted from relaxation measurements at different temperatures and magnetic fields, obtaining that both samples undergo to a pinning regime crossover.
Auxiliary lasers for Advanced Virgo Gravitational Wave detector using single pass Second Harmonic Generation in Periodically Poled Lithium Niobate crystal
Authors: Khan I , Genin E , Fafone V , Pillant G , Maggazu A , Casanueva J , Chiummo A , Leroy N
Published: May 2020

The Advanced Virgo (AdV) detector is composed of different degrees of freedom (DOFs) i.e. Michelson interferometer, two Fabry-Perot arm cavities, signal recycling cavity, and power recycling cavity. These DOFs need to be locked to precise accuracy with robust, fast and reliable control systems. The control signals used to lock all the DOFs are mildly decoupled in frequency and the optical response of the DOFs are nonlinear, where the linear range of operation is just some percentage of the fringe for each DOF, thus posing difficulty in resonance lock at input laser wavelength for all the cavities. In particular, the control status of the arm cavities can alter the state of the detector’s operational configuration. Using Auxiliary Lasers to lock the arm cavities at different wavelength offers flexible and robust lock of the detector and more spatial margin on the control signals. Second harmonic generation offers the most direct way to have laser beam with different wavelength and phase locked to the AdV input laser beam. We generated upto 97 mW of SH beam in single configuration at 532 nm using fibered amplified laser source at 1064 nm in a 10 mm long Poled Lithium Niobate crystal.
The key role of the Silicon Drift Detectors in testing the Pauli Exclusion Principle for electrons: the VIP-2 experiment
Authors: Paolis L De , Amirkhani A , Bartalucci S , Bertolucci S , Bazzi M , Bragadireanu M , Cargnelli M , Clozza A , Curceanu C , Grande R Del , Egger J P , Fiorini C , Guaraldo C , Iliescu M , Laubenstein M , Marton J , Mazzocchi T , Miliucci M , Milotti E , Pichler A , Pietreanu D , Piscicchia K , Scordo A , Shi H , Sirghi D L , Sirghi F , Sperandio L , Vazquez Doce O , Veith M , Zmeskal J
Published: May 2020

The VIP experiment performed an accurate investigation of the Pauli Exclusion Principle for electrons. The apparatus was installed in the Gran Sasso Laboratories of the National Institute of Nuclear Physic in Italy, an underground environment with an extremely low cosmic background. The aim of the experiment was to test the Pauli Exclusion Principle for electrons in a copper target circulated by a Direct Current (DC) current, searching for X-rays emission due to an atomic transition forbidden by Pauli exclusion principle, from the L shell to the K shell of copper when the K shell is already occupied by two electrons. VIP set an upper limit on the Pauli exclusion principle violation probability 1/2β
2 <4.7 χ 10–29. The goal of the upgraded VIP-2 experiment, presently in data taking at Gran Sasso Laboratories, is to improve this limit by two orders of magnitude. The VIP-2 experimental apparatus, in which the Silicon Drift Detectors have the key role of X-ray detectors, and preliminary results are presented.
Unlocking neutrino mysteries via the inverse β-decay
Authors: Blasone M , Lambiase G , Luciano G G , Petruzziello L
Published: May 2020

We discuss some recent results on neutrino physics in the context of the inverse β-decay of uniformly accelerated protons. Specifically, we compute the decay rate of the process p → n + e
+ + ν in both the laboratory frame (where the proton is non-inertial) and the comoving frame (where the proton is at rest and interacts with a thermal bath of electrons and neutrinos due to the Unruh effect). On the basis of the sole requirement of General Covariance of Quantum Field Theory, we manage to show that: i) the asymptotic (i.e. “in” and “out” ) neutrino states to be used for the evaluation of the S-matrix are Pontecorvo flavor eigenstates, ii) the Unruh thermal bath must be made up of oscillating neutrinos.
Factorisation and Local Subtraction of Infrared Divergences for QCD processes
Authors: Signorile-Signorile C
Published: May 2020

We review a recently proposed subtraction procedure at next-to- and next-to-next- to-leading order in quantum chromodynamics (QCD), based on the introduction of a set of minimal, local and analytically integrable counterterms. We also provide an operator definition for the counterterms by investigating the factorisation properties of a generic massless virtual amplitude. Our local, analytic scheme is designed for massless final state radiation only, but its main features are extensible to initial state radiation.
Efficiency enhancement in Dye Sensitized Solar Cells by light scattering in photoanode with TiO2 nanotubes
Authors: Senadeera G K R , Thotawatthage C A , Dissanayake M A K L
Published: May 2020

The effect of incorporating a composite double layered structure of photoanode, based on hydrothermally synthesized TiO2 nanotubes (TNT) as the light scattering layer, on the efficiency enhancement of dye sensitized solar cells (DSSCs) is reported. Device performances comprising this novel photoanode is compared with the DSSCs fabricated with the conventional type of photoanodes without TNT. Further enhancement in the device performances is obtained with the post treatment of the photoanode with TiCl4. The DSSC with post treated two layered composite photoanode showed an overall efficiency of 8.31% with a short circuit photocurrent density (Jsc
) of 16.91 mA cm−2 and 783.4 mV of an open circuit voltage (V
oc) under the irradiance of 1000 W m−2. In comparison, the reference DSSC with a post treated photoanode having the same thickness showed 7.62% efficiency while delivering a Jsc
of 15.60 mA cm−2 with 773.5 mV. The remarkable enhancement in the device performance is achieved due the employment of this double-layered novel photoanode in the DSSCs. However, lower electron life time is observed in the DSSCs with TNT layer suggesting that, rate of electron recombination is higher in the DSSCs with this novel photoanode, although the overall efficiency of the present device and the net result due to the enhanced light harvesting and scattering effect may still be regarded as an favorable alternative for certain applications.