bluuebunny/crossref_metadata_2025 huggingface dataset:
Photodissociation dynamics of methyl iodide across the A-band probed by femtosecond extreme ultraviolet photoelectron spectroscopy
Authors: Downes-Ward Briony , Warne Emily M , Woodhouse Joanne , Parkes Michael A , Springate Emma , Pearcy Philip A J , Zhang Yu , Karras Gabriel , Wyatt Adam S , Chapman Richard T , Minns Russell S
Published: June 2021

The dissociation dynamics of CH3I at three UV pump wavelengths (279 nm, 254 nm, 243 nm) are measured using an extreme ultraviolet probe in a time-resolved photoelectron spectroscopy experiment. The results are compared with previously published data at a pump wavelength of 269 nm, [2020, Phys. Chem. Chem. Phys., 22, 25695], with complementary photoelectron spectroscopy experiments performed using a multiphoton ionization (MPI) probe [2019, Phys. Chem. Chem. Phys., 21, 11142] and with the recent action spectroscopy measurements of Murillo-Sánchez et al [2020, J. Chem. Phys., 152, 014304]. The measurements at 279 nm and 243 nm show signals that are consistent with rapid dissociation along the C–I bond occurring on timescales that are consistent with previous measurements. The measurements at 254 nm show a significantly longer excited state lifetime with a secondary feature appearing after 100 fs which is indicative of more complex dynamics in the excited state. The time-dependence of the changes are consistent with the previously measured MPI photoelectron spectroscopy measurements of Warne et al, [2019, Phys. Chem. Chem. Phys., 21, 11142]. The consistency of the signal appearance across ionization processes suggests that the extended observation time at 254 nm is not an artefact of the previously used MPI process but is caused by more complex dynamics on the excited state potential. Whether this is caused by complex vibrational dynamics on the dominant 3
Q
0 state or is due to enhanced population and dynamics on the 1
Q
1 state remains an open question.
The effect of oxygen admixture on the properties of microwave generated plasma in Ar–O2: a modelling study
Authors: Baeva M , Stankov M , Trautvetter T , Methling R , Hempel F , Loffhagen D , Foest R
Published: June 2021

This work presents results of a self-consistent modelling analysis on microwave plasma generated in Ar–O2 mixtures at a frequency of 2.45 GHz at atmospheric pressure. The study focuses on how the plasma properties are influenced by the increase of the oxygen fraction in the gas mixture. The oxygen admixture is increased from 1% up to 95% in mass for values of the input microwave power of 1 and 1.5 kW. The results show that for a power of 1 kW and gradually increasing the oxygen admixture from 1% to 25% the electron density drops by a factor of more than four due to the energy lost by the electrons due to dissociation of oxygen molecules and the gas heating. An analysis of the number densities of species produced in the Ar–O2 plasma is presented. Oxygen admixtures of above 50% are considered along with an increase of the input microwave power in order to supply the discharge with electron number density values of the order of 1019 m−3. Gas temperatures above 3700 K are obtained in the plasma core along with a strong production of oxygen atoms with a number density of the order of 1023 m−3.
Bounce of a biassed ball
Authors: Cross Rod
Published: June 2021

If a smooth ball is dropped vertically without spin on a smooth horizontal surface then one might expect the ball to bounce vertically without spin. If it does not then the centre of mass of the ball does not coincide with its geometric centre. An experiment is described where a billiard ball and a superball are deliberately biassed by adding a small steel ball on one side. The results agree well with theoretical calculations.
Measurement of strong electromagnetic pulses generated from solid targets at sub-ns kJ-class PALS laser facility
Authors: Rączka P , Cikhardt J , Pfeifer M , Krása J , Krupka M , Burian T , Krůs M , Pisarczyk T , Dostál J , Dudžák R , Badziak J
Published: June 2021

Measurements had been performed of strong electromagnetic pulses (EMPs) generated as a result of laser–target interaction at the sub-ns kJ-class Prague Asterix Laser System facility. Two conductive Prodyn FD5C D-dot pencil probes were used. Measurements were performed inside the experimental chamber and outside the chamber in a large chamber window 40 cm in diameter in a setup that guaranteed 6 GHz bandwidth. A very good signal-to-noise ratio (17:1) was obtained after some steps were taken to ensure proper EMP shielding of the data collection setup. The EMP signal in the time domain was found to have the form of a sharp initial spike followed by gradually decaying oscillations interspersed with some secondary spikes. The values of the vertical component of the electric field strength were estimated. The highest value recorded in this experiment was

620

−
180

+
260

kV m−1 at a distance of 40 cm from the target. It was observed that plastic targets—particularly the 100s of µm thick plastic foils—tend to generate stronger EMP fields than Cu and Au targets. A time-frequency analysis was performed for a typical shot, clearly showing some spectral features that appear only sometime after the start of the signal and hence indicate EMP generation from secondary sources. Electrons ejected from the target were recorded with the energies exceeding 1.5 MeV, which indicates that highly energetic processes are triggered as a result of the laser–target interaction.
Spatio-temporal complexity of power-grid frequency fluctuations
Authors: Gorjão Leonardo Rydin , Schäfer Benjamin , Witthaut Dirk , Beck Christian
Published: June 2021

Power-grid systems constitute one of the most complex man-made spatially extended structures. These operate with strict operational bounds to ensure synchrony across the grid. This is particularly relevant for power-grid frequency, which operates strictly at 50 Hz (60 Hz). Nevertheless, small fluctuations around the mean frequency are present at very short time scales <2 s and can exhibit highly complex spatio-temporal behaviour. Here we apply superstatistical data analysis techniques to measured frequency fluctuations in the Nordic grid. We study the increment statistics and extract the relevant time scales and superstatistical distribution functions from the data. We show that different synchronous recordings of power-grid frequency have very distinct stochastic fluctuations with different types of superstatistics at different spatial locations, and with transitions from one superstatistics to another when the time lag of the increment statistics is changed.
Unified treatment of recoil and Doppler broadening in molecular high-energy photoemission
Authors: Kukk E , Céolin D , Travnikova O , Püttner R , Piancastelli M N , Guillemin R , Journel L , Marchenko T , Ismail I , Martins J , Rueff J-P , Simon M
Published: June 2021

Doppler and recoil effects are an integral part of the photoemission process at the high kinetic energies reached in hard x-ray photo-electron spectroscopy (HAXPES) and have a major effect on the observed lineshape, resulting in broadening, energy losses and discrete excitations. These effects can be modeled with a high degree of detail for small systems like diatomic molecules, for larger systems such treatment is often superfluous as the fine spectral features are not observable. We present a united description of the Doppler and recoil effects for arbitrary polyatomic systems and offer an approximate description of the recoil- and Doppler-modified photoemission spectral lineshape as a practical tool in the analysis of HAXPES spectra of core-level photoemission. The approach is tested on the examples of carbon dioxide and pentane molecules. The C and O 1s photoelectron spectra of CO2 in gas phase were also measured at 2.3 and 7.0 keV photon energy at Synchrotron SOLEIL and the spectra were analyzed using the model description. The limitations and applicability of the approach to adsorbates, interfaces and solids is briefly discussed.
FSS: Fuzzy Supervised Learning for Optimal Path Selection in RPL
Authors: Gopika D. , Rukmani P.
Published: June 2021

IPV6 routing protocol for low power lossy network (RPL) is a standardized routing protocol developed by the IETF ROLL working group. RPL has attained a lot of attraction to the research community as it demands modification adding to its improvement. RPL constructs a Destination Oriented Directed Acyclic Graph (DODAG) considering the metrics and constraints through explicit Objective Functions (OFs). The OFs chooses the best parent for reliable data communication. The existing objective function due to a single metric lacks in satisfying the requirement of real-time IoT applications. Still, the mobility aspect of the node is not considered in the objective function for optimal path selection. In the proposed methodology a Fuzzy Supervised Learning algorithm for quality node prediction using the composite metric based OF from the candidate parent set. The testing phase shows 93% accuracy of prediction with Artificial Neural Network (ANN) classifier which outperforms Naïve Bayes and Decision Tree (DT).
Removal of Noise in an Image using Boundary Detection Technique
Authors: Sarvesh M. , Sivagami M. , Maheswari N.
Published: June 2021

Image data recorded by devices contain mistakes or noises due to geometry and brightness values of the pixels. These mistakes are rectified using proper mathematical models. Examples of models include contrast and edge enhancement, pseudo-colouring, shadow removal, noise filtering, sharpening, and magnifying. Applying filters to remove a noise may lead to loss of some important data like edges in the image. The proposed work removes the noise from the image using local neighbourhood processing and preserves the edges using boundary-based approach. The noise filtered image is tested against the parameter entropy to validate the result.
Intelligent Tourist System For The 21st Century
Authors: Brindha Devi V , Meenaloshini M , Sriram G , Subhashini R
Published: June 2021

Travel Industry is always at the forefront of technology adoption. Most of our researchers and town planners have preferred the method of machine learning approach for tour recommendation models. Some traditional methods have achieved certain levels of success in tourism research, but sometimes artificial neural network (ANN) and regression analysis techniques give better results. Our objective is to investigate the different ways in which the machine learning models can be applied in tourism prediction problems and to show the performance of machine learning methods. In this paper we have an intelligent tourist system using ML/AI that has been modeled based on various features using Sentiment analysis and can be performed over these reviews which will be helpful to find tourist place popularity. Based on sentiment analysis results, tourists can easily decide their own tour destination to be visited. We have categorized the places based on their preference like the most visited or least visited family trip or friend’s trip and so on. The dataset was collected from various tourism review websites. We performed a comparative study of feature extraction algorithms that is Count Vectorization, TFIDF Vectorization, along with classification algorithms like Naive Bayes, Support Vector Machine, and Random Forest algorithm. With these results, a recommendation system has been built which would map an individual user’s interests to the highest rated tourist places and generates a tour plan satisfying the user’s needs.
Edge Aware Turbidity Restoration of Single Shallow Coastal Water Image
Authors: Mary Cecilia S. , Sakthivel Murugan S.
Published: June 2021

The blur and low contrast of underwater images are indicative of the high noise, intense scattering and ultimately the low quality of such images. Image Enhancement and Restoration are imperative pre processing steps for single images from shallow coastal areas. Pre processing of underwater images is hence a prerequisite to processes like classification, object detection and computer vision. The paper presents an effective edge aware restoration models that goals turbid water images. The dark channel based restoration method with a rolling guidance filter gives a more edge aware restored and denoised version of the heavily blurred, low contrast shallow coastal image. This is evident from the subjective and objective projections. Moreover the edge preserving nature projects 13.05% and 5.53% more than UHP (which is in close) in terms of number of edges and UCIQE scores in comparisons with promising algorithms over the decade.
Unsupervised Neural Network approach for the Identification of Anomaly in Speech Signal from Spectrogram Images
Authors: Joshwin Darington M. , Sathiesh Kumar V.
Published: June 2021

In this paper, anomaly identification in speech signal is carried out using an unsupervised Neural Network approach. Input audio signal is divided into small segments of information. Initial segment of the samples are used in the training process. The later portion of the sample segments are used in the test process. The features (Spectral Roll-off, Spectral Centroid, Mel Frequency Cepstral Coefficient (MFFC), Pitch (PH) and Energy Density (ED)) are extracted from the input data. The extracted 1D features are converted into spectrogram images. Then, the images are fed as an input to Neural Network for the prediction of feature values. If three or more feature value does not exceed the threshold value of 75% then the input signal is considered to be free from anomaly. The proposed model results in an accuracy of 97.50% in the detection of anomaly in input speech signal.
Motion Deblurring Analysis for Underwater Image Restoration
Authors: Vimal Raj M. , Sakthivel Murugan S.
Published: June 2021

Exploration of Underwater Images will be a challenging task due to its degradations by haze, blur, colour cast and noise. In order to extract the latent information from the blurred portion, its parameters are estimated and various algorithms were analysed. Initially, length and angle of motion blurred image are estimated. Then, filters and restoration algorithms were implemented for controlling of ringing artifacts, removal of noise and latent information restoration. Some of the model based classical methods were implemented and analysed for underwater motion blurred image restoration.
Heavy-Vehicle Detection Based on YOLOv4 featuring Data Augmentation and Transfer-Learning Techniques
Authors: Sowmya V , Radha R
Published: June 2021

Real-time Vehicle detection is crucial in today’s era for our complex interconnected transportation ecosystem built on an advanced technological network of intelligent systems encompassing a wide range of applications such as autonomous vehicles, traffic Surveillance, advanced driver assistance systems, and etcetera. The significance of its application to digital transportation infrastructure embarks upon a distinct framework for heavy-vehicle detection integrated with the YOLOv4 algorithm for real-time detection. In this proposed work, two entities of heavy vehicles such as buses, trucks are considered. The crux of the model, an algorithmic computational mechanism incorporates Mosaic Data augmentation and Transfer-learning techniques that are applied to avoid over-fitting and to improve the optimal speed during training. Subsequently, a fine-tuning YOLOv4 algorithm is implemented for detecting the heavy vehicle. The algorithm is tested for real-time situations in various traffic densities through Computer Vision. Experimental results show that the proposed system achieves higher detection accuracy of 96.54% mAP. More specifically, the performance of the proposed algorithm with the COCO test set and PASCAL VOC 2007 test set demonstrates improvement when compared with other state-of-the-art approaches.
Built-in translation on Web Messenger
Authors: Karthikeyan U , Ajit Surya A , Bhargav S , Bhargav P
Published: June 2021

The paper aims at providing the users with a web messenger application that translates messages sent by sender to the receiver. The translation is provided by Google Translate API. This helps in having a seamless conversation experience. Any language that is supported by Google Translate can be sent and received by the users. It is planned to provide transfer of graphic files as well as other file types. Interestingly, this method of communication is the most popular form. Encryption and Decryption is provided by employing AES Algorithm function set. The encryption and decryption make it safe for communication by protecting the conversation from outside threats. In order to have a conversation between two people normally in their own preferred language, they have to rely on using Google Translate solely by copying the message text and finding the translation. This web application we have proposed combats that problem by providing simultaneous translation of text messages to the user’s preferred language. Languages that can be translated are the same as what Google Translate provides. ISO 639-1 language codes are used as language code by the sending entity to send the data to the receiving entity. Accuracy have been identified as same as what Google Translate provides, above 60%.
An Approach to Skin Cancer Detection using Keras and Tensorflow
Authors: Panja Abilash , Christy Jackson J , Abdul Quadir Md
Published: June 2021

For humankind, skin cancer is a troubling illness. Given the rapid growth rate of skin cancer, its high treatment cost and death rate, the need for early detection of skin cancer has been increased. Now, the world has evolved in a way where skin cancer detection is possible by image pre-processing and machine learning methods. One well known and well worked method is Convolutional Neural Network (CNN). After segmentation of dermoscopic images, the features of the affected skin cells are extracted using feature extraction technique. We propose a convolutional neural network model to detect cancerous state of a person’s skin and classify them as malignant (melanoma) and benign (non-malignant). The above model’s architecture contains various layers which helps in reading the dataset by computer. Accurate results are always expected in these cases. We are using manual approach instead of automatic approach to overcome possible errors.
Effect of Curing Period and Binder Quantity on The Characteristics of Bagasse Ash-Calcium Carbide Residue Stabilized Organic Clay
Authors: Hatmoko J T , Handoko L
Published: June 2021

Organic clay has low bearing capacity, low shear strength, sensitive to water content, and high compressibility. Therefore, the study about engineering properties improvement of organic clay is continuously in progress. In this research, bagasse ash (BA) and calcium carbide residue (CCR) were used as stabilizing agents to improve engineering properties of organic clay. Preliminary investigation was done to get the physical parameters, especially Atterberg limit of soil samples. To get the optimum water content (OMC), the original soil was compacted according to standard compaction test. The oven dried soil was mixed with 5, 10, 15, 20, 25 and 30% of binder and cured with 7,21,36 and 56 days curing period. Then, Atterberg limits, unconfined compression strength, and modulus of elasticity of treated soil were investigated. The plasticity index (PI) of stabilized soil decreases proportional to the binder quantity. However, after 10% binder, there was no significant improvement of PI of treated soil. With respect to curing period, PI of stabilized soil decreased, but the decrease of PI was almost constant from 36 to 56 days curing time. Unconfined compression strength (UCS) and modulus of elasticity of stabilized organic clay improve proportionally to both binder proportion and curing period. However, the improvement is not significant enough due to organic content in the organic clay.
Borate Glasses for Low Loss Optical Fibre
Authors: Saraswati A , Marzuki A , Fausta D E , Suryanti V , Singgih G A
Published: June 2021

Borate glasses with composition 50B2O3 – (25-x) Bi2O3 – 25ZnO – xTiO2 where x = 0, 1, 2, 3, 4 (mol%) were succesfully fabricated using a convensional melt-quenching technique aimed at tailoring glass suitable for a low loss optical fiber fundament. For this purpose, glasses were characterized for their density, refractive index, reflectance, UV-Vis absorption and FTIR spectra. Density measurement was carried out by applying Archimedes principle. Refractive index was measured using Brewster’s angle method. UV-Vis spectrum was recorded within the range of 200-1100 nm and FTIR measurement was measured at IR range. Combining the spectra data recorded both from UV-Vis–NIR and FTIR, the theoretical minimum loss of the glass was obtained. In addition, the band gap energy of the present glasses was also calculated. From these data, it can be derived many other glass properties such as Oxygen Packing Density (OPD), ionic radius, and polaron radius.
Time dependence of the concentration of dissolved ozone in water generated by dielectric barrier discharge (DBD) plasma using atmospheric air
Authors: Cahyani M R , Zuhaela I A , Saraswati T E , Kusumandari  , Anwar M. , Suselo Y H , Ismayenti L
Published: June 2021

Ozone is one of the reactive oxygen species that can be produced from plasma. In this study, the ozone was generated by using a dielectric barrier discharge (DBD) plasma technology. DBD plasma was generated using two electrodes separated by a glass dielectric isolator and an alternating current (AC) voltage source of 5 kV with an airflow rate of 1 L/min at room temperature and atmospheric pressure. In this study, the ozone concentration was determined using the titration method. The ozone concentration was measured by varying the titration time between 0-10 minutes. The time dependence of ozone concentration in water tends to follow the polynomial trendline. The longer plasma treatment was performed, the higher ozone concentration was measured. The ozone significantly increased when the treatment was conducted for more than 6 min.
Cassava waste pulp – poly(acrylamide-acrylic acid) based hydrogels using gamma irradiation
Authors: Puspita I , Kurniati M , Winarti C , Maddu A
Published: June 2021

Cassava waste pulp (onggok) based hydrogels were synthesis with added of acrylic acid (AA) and acrylamide (AAm). The used of onggok promises superior properties such as eco-friendly, lower prices because the raw materials are available naturally in abundant quantities compared to synthetic polymers, and biodegradable. Gamma irradiation method at doses of 0, 10, 20, and 30 kGy was carried out to produced cross-linked structures. Swelling, gel fraction, physical strength, and morphology were parameters of the hydrogels. The most optimum result was obtained from the addition of 25% acrylic acid and irradiation dose of 10 kGy, with swelling of 9423%, diffusion coefficient of 0.2393, gel fraction of 75.98%, the hardness of 8.53 mJ, and elasticity modulus of 7.01 kPa.
Preparation of Poliblend Suweg Starch-Chitosan with Addition of Essential Oil from Sweet Orange Peel as Edible Coating on Malang’s Apples
Authors: Susilowati E , Mahardiani L , Sulistyowati D
Published: June 2021

Poliblend edible coating of suweg starch-chitosan (SSC) was prepared as a package with the addition of essential oil from sweet orange peel as antibacterial because of the high limonene content (95%) to increase the shelf life of malang’s apples. There are 6 variations formulation of the suweg starch: chitosan, namely 10: 0, 9: 1, 8: 2, 7: 3, 6: 4 and 5: 5 in total volume 60 mL. Essential oil of sweet orange peel was added with variations in the concentration of essential oil is 0%; 2%; 4%, and 6%.). Furthermore, characterization was carried out by mechanical testing, Water Vapor Transmission Rate (WVTR), solubility, and swelling of the SSC polyblend edible film and the antibacterial activity test of the SSCO polyblend edible coating on Staphylococcus Aureus bacteria before it was applied on malang’s apples. Organoleptic tests and physical observations of malang’s apples were carried out after the application of edible coating SSCO. The result characterization of the functional groups of polyblend edible film SSCO showed the absorption of the wave number 3373.64 cm−1; 1646.32 cm−1; 1570.12 cm−1; 1416.78 cm−1 and 1337.69 cm−1; and 1040.64 cm−1 with functional groups-OH, N-H, C=C, CH3, and C-O. The variation composition affects on the physical properties of edible film SSC in the mechanical test, WVTR, and WVP with the optimum concentration edible film SSC 7: 3, while the solubility and swelling reach the optimum concentration edible film SSC of 5: 5. The addition of sweet orange peel as essential oil had an effect on the antibacterial activity of polyblend edible film SSCO with a maximum inhibition zone 16.55 mm on concentration 6% for S. aureus bacteria. Based on organoleptic test, consumers prefer edible coating SSC with the lowest essential oil content and malang’s apples can last 22 days on physical performance observations.
Modified Activated Carbon on Electric Double Layer Capacitor Applications
Authors: Ramelan A H , Fuady M I A
Published: June 2021

The increase of populatioin in the world will be accompanied by the increase of energy need. The energy is not available in all time, sometime we lack of energy and also sometime the energy is available in abundant and in turn the energy wasted to nature. Therefore efforts have to be conducted to solve the problem. One of those is to make a cell which can store the excessive energy so called a supercapacitor. The supercapacitor in this research was fabricated using an activated carbon from the palm kernel shell (PKS). The performace of biomass-based activated carbon as an electrode for Electric Double Layer Capacitor (EDLC) was investigated using the cyclic voltammetry method. The test of EDLC was conducted using three electrode system, with carbon as the working electrode, Ag/AgCl as the reference electrode, Pt as the auxiliary electrode and 0.5 M H2SO4 solution as the electrolyte. The carbon tested was activated carbon pyrolysis at temperature 700°C, 800°C, and 900°C. Testing was carried out by varying the scanning rate in 5 and 100 mV s−1. The test was carried out using a potentiostat by settling the potential value between −0.2 V to 0.7 V. The results showed that activated carbon at 5 mV s−1 has the highest capacitance value of 49.76 F/g. It is also noted that the specific capacitance decreased by increasing scanning rates.
Crystallite structure of Palm shell Activated Carbon/MgO and Its Influence on Carbon Monoxide and Carbon Dioxide Adsorption
Authors: Yuliusman  , Nafisah A R
Published: June 2021

Gas emission of the motor vehicle is a major contributor to climate change, with a total of 14% emission annually, and the best potential option for reducing pollution is using the adsorption method. Magnesium oxide (MgO) has been proven as an effective adsorbent for liquid and gases. The impregnation of MgO on porous structure increases the affinity toward nonpolar gases, which is one of the purposes of this study. The crystallite structure is also a key factor that determines the adsorption capacity of activated carbon (AC). However, deeper analysis is needed in the activated carbon crystallite structure represented by d002 (aromatic layer), Lc (crystallite height), and La (crystallite diameter) on the adsorption of motor vehicle gas emissions. Three types of palm shell-based activated carbon were tested in this experiment. The results showed that activated carbon made using the two-step method and the AC/MgO produced surface structure with a d002 value of 0.33 nm and 0.32 nm, respectively. The impregnation of MgO on AC showed changes in surface structure and affected its crystallinity. The ability to adsorb CO2 and CO by AC/MgO increase up to 80% and 88%, respectively.
Synthesis and Metal Phases Characterization of Mordenite Supported Copper Catalysts
Authors: Sabiilagusti A I , Nugrahaningtyas K D , Hidayat Y
Published: June 2021

Three catalysts were synthesized by the impregnation method using copper as an active metal and mordenite as a support material. The metal loading was set at 0, 4 and 8 %wt, respectively. The used copper salt solutions were collected as filtrate and analyzed by atomic absorption spectroscopy (AAS) to predict the metal content was successfully loaded onto mordenite. For a further step, catalysts are activated through the calcination and reduction process. The metal content was further confirmed by X-Ray Fluorescence (XRF) and the results were not much different compared to AAS analysis. It was obtained that copper metals were successfully impregnated on the catalyst as 3.74 %wt for Cu/MOR 4 and 5.52 %wt for Cu/MOR 8. Meanwhile, the catalysts were also characterized using X-ray diffraction (XRD) and then followed by match with a mordenite standard diffractogram. Further diffractogram analysis was carried out by the Le Bail method to get semi-quantitative data of metal phases on catalysts. Mordenite phase was consistently obtained as the main content of all catalysts, over 99%. The copper phase at Cu/MOR 4 catalyst was consisted of Cu, Cu(OH)2 and Cu2O. In contrast, Cu/MOR 8 catalysts showed no Cu(OH)2 phase on it, but Cu and Cu2O still found.
The Influence of Graphene Oxide and Cristobalite Phase of Silica Precipitate on Chitosan – Based Nanocomposites
Authors: Handayani M , Mukhsin S A , Sulistiyono E , Triwardono J , Firdiyono F , Febriana E , Prasetyo A B , Nugroho F , Rahardjo S B
Published: June 2021

Nanocomposites are commonly used as fillers with size at the nanoscale and have low loading, have the potential to match or significantly improve performance to supply conventional composites. Graphene oxide (GO), an oxidative exfoliating product of natural graphite, has attracted much attention due to its excellent strengthening effect on polymers. Young modifications of the GO sheet and the strong interaction interface between GO and the matrix polymer. Therefore, graphene oxide is expected to offer a promising nanoscale for the next generation of nanocomposite materials. Besides that, silica precipitate a critical materials used in many applications worlwide. Silica Precipitates have become key fillers in nanocomposites due to their properties which can improve mechanical properties. In this study, Chitosan-based Nanocomposite Films have been made by casting methods. The effect of graphene oxide and silica precipitates on the chitosan film and their properties were investigated. Graphene oxide used in this study was synthesized with chemicals from pure graphite using the Hummer Method. Graphene oxide produced from the hummer method was characterized by X-Ray Diffraction and Scanning Electron Microscope. Silica precipitates in this study uses cristobalite phase of silica. The measurement results of the mechanical properties of nanocomposite films show that adding christobalite phase of silica precipitate content in composites increases the tensile strengh of 21.3 Mpa and higher than addition of GO in the chitosan films. Meanwile, addition of GO in chitosan film increases the young modulus up to 2.73 Gpa.
Formulation and evaluation of the cream made from potassium azeloyl diglycinate as an anti-aging
Authors: Rohmani Sholichah , Dinda Kezia Esther , Ainurofiq Ahmad
Published: June 2021

Potassium Azeloyl Diglycinate has the ability to moisturize the skin, regenerate cells, increase skin elasticity, and hide fine lines. This research aims to discover the stability and effectiveness of anti-aging cream made from Potassium Azeloyl Diglycinate in regenerating and hydrating skin. The anti-aging cream formulation was made by varying the concentration of Potassium Azeloyl Diglycinate (0%,3%,5%,7%) and then the physical properties stability was evaluated. The best formula was going to be tested for its ability to regenerate the mouse’s skin cells that had erythema, and hydrated the respondent’s skin. In addition, an antioxidant activity was tested on pure Potassium Azeloyl Diglycinate and Vitamin C as the positive control. The results showed that the F2 Cream had the best physical properties stability evaluation results. The F2 Cream had the better ability to regenerate the mouse’s skin cells than the positive and negative control groups (the erythema diameter was 4.33 ± 4.04 mm), and was also able to increase the skin moisture of 12 respondents who participated in the research. The results of the antioxidant activity test showed that Potassium Azeloyl Diglycinate belonged to the very weak antioxidant group (IC50:83.946.587 ppm), while Vitamin C belonged to the very strong antioxidant group (IC50:1.684 ppm).
Texture Depth and Cost Analysis of Slurry Seal Cationic Rapid Setting Cold Asphalt Mixture
Authors: Sugianto  , Setyawan A , Budiarto A , Sarwono D , Akhmad A
Published: June 2021

Slurry seal is a mixture of asphalt emulsion, fine aggregate, mineral filler, water, and other added ingredients are mixed evenly without heating and is spread over the surface of the pavement with a maximum thickness of 10 mm. This study was conducted to determine the relationship of the depth texture and skid resistance resulting from the modification of the aggregate and filler slurry seal based texture depth test of sand patches. Slurry seal is made using basalt stone aggregate filler Ordinary Protland Cement (OPC), limestone filler aggregate OPC and aggregate rock with filler standard OPC composition: High Calcium Fly Ash 50%: 50%. Increasing the texture depth will add road surface roughness. Slurry seal with basalt stone aggregate having the largest texture depth is 1.837 mm so as to provide the greatest improvement of skid resistance. Texture depth slurry seal with limestone aggregate is 1,767 mm that mean increasing skid resistance. Slurry seal standard aggregate has a depth of 1,673 mm texture which represents an increase skid resistance smallest slurry seal between basalt stone aggregate and limestone. Slurry seal with cheapest price is limestone slurry seal aggregate Rp. 44,817.00 / m2 compared basalt aggregate Rp. 45,085.00 / m2 and a standard stone mixture of cement and fly ash filler Rp. 44,914.00 / m2.
Function and Performance Optimization of Kamijoro Dam Redesign through Value Engineering Analysis Application
Authors: Tristanto R H , Sobriyah  , Hadiani R , Setyawan A
Published: June 2021

The Kamijoro Dam is very useful to support increased agricultural production, especially to strengthen food self-sufficiency and supply of raw water. The authors redesigned the Kamijoro dam. Based on observations, there is a dam potential to increase its capacity and function by first redesigning the initial planning. In order to redesign the Kamijoro dam, value engineering analysis was applied. The value engineering results are compared with the initial design to obtain a better, more effective and efficient dam design. The way to compare it is to use the evaluation matrix method. From the planned peak length of the dam 161 meters, dam discharge of 13.171 m3 / sec / m1, the fulfillment of raw water is 500 l / s with a project value of Rp. 188.799.932.000,-. Based on the analysis of technical values, by reducing the width of the dam, we obtained several performance optimizations. Among them are the dam spanning 125 peaks, flow rate of 17.90 m3 / second / meter, raw water requirement of 600 liters / second and the project value of Rp. 183.229.730.000,-With a slight cost efficiency of the project value of about 2.95%, a more optimal dam function and performance were obtained.
A review on optimization of design of tuned mass dampers
Authors: Chaudhary A S , Nandanwar Y N , Mungale N G
Published: June 2021

Tuned mass dampers (TMDs) are applied in various high rise buildings to reduce wind induced and seismic vibration response of the structures. This paper reviews various techniques to optimize design variables of TMDs i.e. damping ratio, period and mass. The optimization problem of TMD deals with TMD frequency tuning to different frequency modes of vibration of structures. The application of novel optimization approaches such as genetic algorithm and modified bat algorithms are reviewed in this paper.
Modification of the electrical conductivity and thermal properties of a Lithium Borate glass by BaO substitution
Authors: Deshpande A M , Deshpande V K
Published: June 2021

Lithium barium borate glasses of composition defined as series I : 30 Li2O - X BaO - (70 – X) B2O3 (where X = 0, 5, 10, 15 and 20 mol %) and series II : (30 – X) Li2O - X BaO - 70 B2O3 (where X = 0, 5, 7.5, 10, 12.5 and 15 mol %) have been studied for their density, the coefficient of thermal expansion, CTE, glass transition temperature, Tg and electrical conductivity. An attempt is made to correlate the observed variations in these properties with the Li+ ion content, mass and the field strength of the Ba2+ cations and corresponding changes in the network. The studied glasses offer a very good range of CTE (72 - 112 x 10−7 / K) and could be developed as electrical insulators on account of their poor electrical conductivity..
Combustion synthesis of Ba3Y1-xSm3+x(BO3)3asred-light emitting phosphors for indoor plant cultivation applications
Authors: Hargunani S P , Sonekar R P , Kaur Harmanpreet , Mahakhode J G , Dhoble Samikha B
Published: June 2021

In this paper, a series of Sm activated Ba3Y(BO3)3phosphors are synthesized byhigh-temperature solution combustion method. The concentration of Sm ions is changed from 1 to 5 mol% in the host lattice of BYB crystal. The crystal structure, phase of formation, particle size, elemental analysis, photoluminescence study of synthesized phosphors aredone using X-ray diffraction, FE-SEM, Fourier transform infrared spectroscopy (FTIR) and photo luminescent (PL) techniques. The excitation spectra consisted of strong bands in the NUV and blue region. The phosphors on excitation at 449 nm exhibited a strong emission peak in the region 630-660 nm, which corresponds to the absorption spectra of PR phytochrome. The obtained photometric results show that these can be used for the design of light-emitting diodes for indoor plant applications, houseplants gardening and in horticultural fixtures.
Investigations on structural, photo-physical and photometric parameters of metal based quinoline complexes for OLEDs
Authors: Thejo kalyani N , Mullemwar S Y , Choudhari P D , Gahukar P M , Dhoble S J
Published: June 2021

This paper includes the synthesis of bluish-green light emitting metal based hydroxyl quinoline complexes namely, Mgq2, Baq2 and MgxBa(1-x)q2 (Mg: Magnesium, Ba: Barium, q: 8-hydroxy quinoline, x = 0.1, 0.2,….0.9) by simple precipitation method at different values of pH and stoichiometry. It’s noteworthy to state that we are the first one to report novel complexes based on Ba (Baq2 and Mg0.5Ba0.5q2). The inquisition of these complexes was carried out to probe structural, photo physical and photometric parameters by FTIR, photoluminescence (PL) spectra and 1931 CIE colour calculator, respectively. These investigations reveal that pH value and stoichiometry have feeble effects on the emission wavelength and intensity. Investigations further reveal that among all the synthesized complexes, Baq2 (at pH 6.5) emits intense blue light in various environments. Thus, barium based quinoline complexes have the potential to sustain their emission features in solid state as well as in acidic and basic medium-one of the characteristic features which are highly essential for the fabrication of OLEDs by vacuum as well as solution techniques.
Critical review on lanthanide activated LED phosphors
Authors: Bawane Utkarsh A , Kadam Abhijeet R , Nande Amol , Dhoble S J
Published: June 2021

Broad range of phosphors has been utilized for LEDs in past few years, subsequently, encourages the phosphor-converted LEDs (pc-LEDs). Proposed article gives an idea about the different color tunable phosphors used in solid state lighting. Different properties of different color emitting phosphors have been done with the mixing of rare earths in the host lattice of luminescent centered materials which shows color emission in the visible range. There is a concise approach toward the different characteristics and records related with the color quality and execution of pc-LEDs. So this article mainly deals with role lanthanides in LED phosphors and their characteristics in the field of luminescence.
Combustion synthesis and spectroscopic properties of Ba2Zn7F18:Eu3+ phosphor
Authors: Tatte Sonal P , Parauha Yatish R , Dhoble N S , Ghanty Chandan , Dhoble S J
Published: June 2021

In the present work, a series of Ba2-xZn7F18:xmol%Eu3+ (x =0.1,0.5,0.7,1.0,15) phosphors were synthesized by combustion method. The spectroscopic properties of synthesized phosphor were observed by photoluminescence and photometric characterization technique. The obsearved excitation spectra revealed two bands around 395nm and 466nm that was attributed to the 7F0→5L6, and 7F0→5D2, transition oftrivalent europium ions, respectively. Under 395nm and 466nm excitation, the PL emission spectra shows several emission bands around at 580nm, 593nm and 613nm, which are ascribed due to 5D0→7F2, 5D0→7F1, and 5D0→7F2 transition of Eu3+ ions, respectively. The emission band of 613nm indicates the highest emission intensity compared to the other emission bands. The emission band revealed the highest emission intensity at 1mol% concentration of Eu3+ ions. Further, a CIE chromaticity diagram was obtained, which is confirmed that red emission. The entire investigation and their outcomes revealed that the synthesized phosphors exhibit strong red emission, which can be applied in the lighting industry and display applications.
Luminescence in Li3ScBr6: Ce
Authors: Bhoyar Rajani A , Nayak A C , Tawalare P K , Wankhede S P , Moharil S V
Published: June 2021

Synthesis and photoluminescence properties of Li3ScBr6:Ce phosphor are described. The phosphor was synthesized by a simple wet-chemical method. Lithium carbonate and Scandium oxide in stoichiometric proportions were dissolved in HBr. Activator was added in form of oxalate salt. After evaporating the solution to dryness the phosphor powder was obtained. Strong ultraviolet emission was observed for this phosphor. The UV emission is typical of Ce3+. It consists of a 359 nm band having a component at about 340 nm. The excitation spectrum has the most intense band at 314 nm besides smaller bands/shoulders around 255, 280 and 335 nm.
Photoluminescence properties of green emitting phosphor Y4Al2O9: Tb3+ derived by modified combustion route
Authors: Dhadade I H , Moharil S V
Published: June 2021

The Tb3+-doped Y4Al2O9 powders were synthesized by combustion technique employing dual (Glycine +Urea) fuel. Formation of the compound was confirmed by xRd technique. Photoluminescence (PL) properties of Tb3+ ions doped Y4Al2O9 (with Tb3+concentration = 0.5,1,1.5,2, 2.5 mol%) were investigated. It was found that Y4(1-x)Tb4xAl2O9 phosphor exhibits green emission under 251 nm excitation. The emission intensity is found to be maximum at 2 mol % of Tb3+ activation further increase in Tb3+ incorporation deceases the emission intensity exhibiting concentration quenching.
Luminescent polymers-based light emitting diodes: A review
Authors: Gawande A C , Rautand S B , Dhoble Samiksha B
Published: June 2021

Diodes with light emitting materials fetch the attention with different emerging trends such as Optoelectronic devices, Solar cells, etc. are very crucial, revolutionary and fascinating from the research point of view. The main focus of this review is to explore conducting polymer such as Polyacetylene, which plays vital role in electroluminescent devices. In this case, an optical and electrical characteristics of light emitting diode with Al is used for the contacts of electron injection which upgrade the performance of light emitting diode in terms of quantum efficiency.
Piezoelectric transducer as a renewable energy source: A review
Authors: Pawar S G , Pradnyakar N V , Modak J P
Published: June 2021

Green energy source has a vital role for production of electricity. Since present day, conventional fuel was considered as the core sources of electricity. In this paper, source of green energy discussed is very rare. Solar and wind power have been considered as inherent energy sources of electricity through solar cells and wind mill. Sound energy in the form of noise is comparatively unexplored source around us for generation of electricity. This noise can be successfully converted into electricity by using suitable transducer. Piezoelectric transducers has major role for noise to electricity. Multiple transducers can be used to produce electricity which can be stored and utilized further. The present object of this paper can offer renewable green energy source which can be beneficial in worldwide search of nonconventional source of energy.
Structural characterization of starch capped ZnO nanoparticles
Authors: Lahariya Vikas , Pandey Krishna Kumar , Dhoble Sanjay J
Published: June 2021

Zinc oxide nanoparticles have been synthesized by a simple green synthesis route using soluble starch as a capping agent in an aqueous medium. The results of structural investigation of ZnO nanoparticles using various techniques such as X-ray diffraction, scanning electron microscope and Fourier transforms spectroscopy have been presented. XRD confirms the formation of c-axis orientated hexagonal wurtzite crystalline structure of ZnO with average particle size in the range of 21 nm to 25 nm. The morphology of the ZnO samples were determined by SEM images, indicating nano rod like structure with hexagonal phase for starch capped ZnO nanoparticles. Further, the presence of starch and different functional group in synthesized ZnO nanoparticles have been studied by Fourier transform spectroscopy approve the different bonding between starch with Zn.
Effect of mechanical mode - qubit interaction on perfect optical non-reciprocity in double cavity system
Authors: Kumar Tarun , Gosain D.S. , Bhattacherjee Aranya B
Published: June 2021

Quantum devices exhibiting optical non-reciprocity are indispensable for quantum information processing and communication technology. In this paper we propose a double cavity optomechanical system where the movable mirror of the cavity is linearly coupled with a qubit placed inside the cavity. We study the effect of this mechanical mode - qubit linear interaction on time reversal symmetry i.e, optical non-reciprocity and prove that mechanical mode - qubit interaction can be used as a new tool to control optical non-reciprocity.
Effect of etching on formation of 60° domain in KNbO3 single crystal
Authors: Korde Vivek B. , Patil Naresh M. , Khairnar C. M.
Published: June 2021

Domain study is a very useful tool to explain ferroelectric materials for its PotassiumNiobate (KNbO3) crystal were doped with Aluminum (Al). This Al-doped KNbO3 ferroelectric crystal further chemically etched using the etchant methyl alcohol. Trino cular m icro scopy m ethod was u sed to verify the ob servation s. In this study 60° domains domain walls and domain boundaries observed. Brief mechanism offorming 60° domain structure and domain wall discussed.