bluuebunny/crossref_metadata_2025_split huggingface dataset:
Adjustable light source for low light level with nearly constant correlated color temperature
Authors: Wu Z F , Li L , Dai C H , Wang Y F , Cheng Q T , Xie Y H 
Published: January 2022

Abstract
Low light level (LLL) calibration becomes more and more important since the rapid growth of remote sensing. The spectral radiance at normal higher light levels can be calibrated with good accuracy, while LLL spectral radiance cannot. If an adjustable light source can be designed at nearly constant correlated color temperature (CCT) covering several orders of magnitude, low light level spectral radiance can be obtained with the help of a photodetector. Whether or not the spectral distribution of an integrating sphere based light source is nearly constant is investigated. By adjusting the diameter of the variable aperture between the integrating sphere and tungsten lamp, the spectral radiance can be varied over 6 orders of magnitude. However, the relative spectrum in the red region increases notably when the spectral radiance is decreased to 1/100000. If the spectral radiance is decreased further, the spectral difference can be more than 300% and CCT decreases more than 250 K. By using baffles and another integrating sphere, low light level radiation source at nearly constant spectral distribution is obtained. The variation of CCT is less than 50 K over 6 orders of magnitude.
Structure and microstructure behavior of iron doped potassium sodium niobate powders
Authors: Amaya-Zabala S , Echavarría-Isaza A , Tobon J , Roca R , Londoño-Badillo F A 
Published: January 2022

Abstract
In this paper, the synthesis and characterization of the potassium sodium niobate doped with iron powders have been studied. Solid-state oxide reaction sintering was used. The powders produced in this work exhibit no homogeneous microstructure, which introduced the growth of random cylindrical structures and will can contribute to the increased porosity ceramics. It was observed average particle size of 3μm, besides, also it was observed the formation of agglomerations and an increase in the size of these clusters with the increase in the amount of iron. The calcination temperature was 950 °C. This is slightly higher than other potassium sodium niobate powders systems. In addition to the physical and microstructural properties, structural properties are presented and analyzed for the first-time using Mössbauer spectroscopy as complementary technique in Fe 3+doped potassium sodium niobate powders. This work is important to state solid physics because establishes the influence of iron in the potassium sodium niobate system, and so the future obtaining of multifunctional materials that have piezoelectric and magnetic properties.
Classification of Parkinson’s disease patients based on spectrogram using local binary pattern descriptors
Authors: Gelvez-Almeida E , Váasquez-Coronel A , Guatelli R , Aubin V , Mora M 
Published: January 2022

Abstract
Extreme learning machine is an algorithm that has shown a good performance facing classification and regression problems. It has gained great acceptance by the scientific community due to the simplicity of the model and its sola great generalization capacity. This work proposes the use of extreme learning machine neural networks to carry out the classification between Parkinson’s disease patients and healthy individuals. The descriptor used corresponds to the feature vector generated applying the local binary Pattern algorithm to the grayscale spectrograms. The spectrograms are obtained from the audio signal samples from the considered repository. Experiments are conducted with single hidden layer and multilayer extreme learning machine networks comparing the results of each structure. Results show that hierarchical extreme learning machine with three hidden layers has a better general performance over multilayer extreme learning machine networks and a single hidden layer extreme learning machine. The rate of success obtained is within the ranges presented in the literature. However, the hierarchical network training time is considerably faster compared to multilayer networks of three or two hidden layers.
Impulsive simulation model for the dynamics of allergen immunotherapy
Authors: Vergaño-Salazar J G , Córdova-Lepe F , Pastenes L , Cuesta-Herrera L , Lozada-Yavina r 
Published: January 2022

Abstract
This study aims to analyze the effects of allergen immunotherapy, used to treat allergic symptoms such as pollen allergy. Mathematical models are used as a methodological approach to simulate from a system of impulsive differential equations the dynamics of the model. Immunotherapy is based of supplying small amounts of pollen to the patient, which leads to minimizing severe allergic symptoms when patients are subsequently exposed to higher amounts of pollen in the environment. Lymphocyte concentrations are considered state variables, allowing the behavior and efficacy of allergen immunotherapy to be identified. The manuscript proposes a method that allows to model mixed systems. Phenomena that present continuous times in some instants and discrete times in others, these are phenomena that are frequently found in the field of physics. Allergen immunotherapy is most effective when a treatment is created with pollen dose increments in a linear form.
Newton’s law learning assessment: an experience with high school students
Authors: Prada Nuñez R , Hernández-Suarez C A , Gamboa Suarez A A 
Published: January 2022

Abstract
The Force Concepts Inventory is a test to determine the level of conceptual knowledge of students about mechanical physics and to evaluate the effectiveness of different teaching strategies on the conceptual component of learning. The test is applied with the purpose of knowing the level of conceptualization of the students of a Physics subject course. The results of the pre-test made it possible to find out the level of conceptualization that the students possessed and provided information for the development of workshops based on real physical situations that required the elaboration of force diagrams. The results of the post-test allowed estimating Hake’s learning and showed evidence about the conceptual evolution of the students and information to develop future teaching activities on Newton’s laws.
Investigation of parameters of new MAPD-3NM silicon photomultipliers
Authors: Ahmadov F. , Ahmadov G. , Akbarov R. , Aktag A. , Budak E. , Doganci E. , Gurer U. , Holik M. , Kahraman A. , Karaçali H. , Lyubchyk S. , Lyubchyk A. , Lyubchyk S. , Mammadli A. , Mamedov F. , Nuruyev S. , Pridal P. , Sadigov A. , Sadygov Z. , Urban O. , Yilmaz E. , Yilmaz O. , Zich J. 
Published: January 2022

Abstract
In the presented work, the parameters of a new MAPD-3NM-II photodiode with buried pixel structure manufactured in cooperation with Zecotek Company are investigated. The photon detection efficiency, gain, capacitance and gamma-ray detection performance of photodiodes are studied. The SPECTRIG MAPD is used to measure the parameters of the MAPD-3NM-II and scintillation detector based on it. The obtained results show that the newly developed MAPD-3NM-II photodiode outperforms its counterparts in most parameters and it can be successfully applied in space application, medicine, high-energy physics and security.
The CMS electromagnetic calorimeter upgrade: high-rate readout with precise time and energy resolution
Authors: Mijuskovic Jelena 
Published: January 2022

Abstract
The electromagnetic calorimeter (ECAL) of the CMS detector has played an important role in the physics program of the experiment, delivering outstanding performance throughout data taking. The high-luminosity LHC will pose new challenges. The four to five-fold increase of the number of interactions per bunch crossing will require superior time resolution and noise rejection capabilities. For these reasons the electronics readout has been completely redesigned. A dual gain trans-impedance amplifier and an ASIC providing two 160 MHz ADC channels, gain selection, and data compression will be used in the new readout electronics. The trigger decision will be moved off-detector and will be performed by powerful and flexible FPGA processors, allowing for more sophisticated trigger algorithms to be applied. The upgraded ECAL will be capable of high-precision energy measurements throughout HL-LHC and will greatly improve the time resolution for photons and electrons above 10 GeV.
Development of the Q-band ECE imaging system in the large helical device
Authors: Goto Y. , Tokuzawa T. , Kuwahara D. , Ichinose K. , Tsuchiya H. , Nishiura M. , Shimizu T. , Kubo S. , Yamada I. 
Published: January 2022

Abstract
In this study, we developed the Electron Cyclotron Emission Imaging (ECEI) system with the Q-band in the Large Helical Device (LHD). ECEI measurement makes it possible to obtain the spatiotemporal structure of magnetohydrodynamics (MHD) instabilities in the high-β plasma. Although there were several difficulties for realizing the multi-channelization, such as local oscillator (LO) optics and an expensive high-power LO source, we have solved these problems by developing a Local Integrated Antenna array (LIA) which has an internal LO supply, using a frequency doubler integrated circuit on each channel, instead of a conventional Horn-antenna Mixer Array (HMA) with common LOs. In addition, we have made some improvements to enhance the quality of the measurement signal. First, we developed and introduced notch filters that prevent the strong Electron Cyclotron Resonance Heating (ECRH) stray signal from being mixed into the measurement circuit. Second, the position of the doubler built in the printed circuit board was reconsidered to prevent the mixing of higher harmonic components into the mixer. Also, we have adopted the Logarithmic detector (LOG detector) to deal with the wide dynamic range of the plasma fluctuation. After these improvements, for the first time, we could successfully obtain the initial results of the two-dimensional temperature distribution and its fluctuation distribution in the LHD.
How does the Government Manage Waste? Analysis of Waste Management in Bantul Regency, Indonesia
Authors: Pribadi Denny Ardiansyah , Purnomo Eko Priyo , Fathani Aqil Teguh , Salsabila Lubna , Azmi Novia Amirah 
Published: January 2022

Abstract
A This study aims to determine the extent of waste management in Bantul Regency with the concept of policy implementation by Edward III, which consists of policy communication, policy coherence, and policy implementation consistency. The government and society are currently trying to manage 3R-based waste (Reduce, Reuse, and Recycle). Researchers used a qualitative descriptive method using secondary data consisting of literature, online media and the internet, and documents from the Bantul district government. The results of the study stated that: Bantul Regency Government is still not optimal in terms of waste management; this can be seen from the level of attention to waste management and management, which is still minimal, thus giving the result that the government has not succeeded in handling waste quickly, precisely and correctly. However, if seen from the amount of waste mass, there was a reduction from 202,910 tons (2019) to 192,021 tons (2020); this is because COVID-19 has stopped mobility and activities so that the amount of waste is not as much as in 2019. However, it should still be noted that waste management must be improved so that waste in the future does not become a new problem.
Photocatalytic Inhibition of Gram-positive and Gram-negative Bacteria by Nanoparticulate C-doped TiO2
Authors: Chen Xixi , Yan Xiaoying , Yuan Ronghui , Shan Dakun , Ji Jiamei 
Published: January 2022

Abstract
C-doped TiO2 (C-TiO2) was synthesised using a solvothermal method with ethanol/TBT/LDPE medium. Microstructure and elemental composition of C-TiO2 were analysed with TEM and XPS. An anti-bacterial device was utilized for photocatalytic inhibition of gram-positive and gram-negative bacteria. The device to measure bacteriostatic action was placed in a dark room, and the bacterial culture was placed in a holding cup which contained holding box and nanoparticulate C-TiO2. This approach was convenient for addition and removal of C-TiO2. Photocatalytic bacteriostasis by C-TiO2 under visible-light irradiation was quantitively assessed for bacteriostatic properties. Moreover, the qualitative assessment of anti-bacterial activity with C-TiO2 was less significant for gram-positive bacteria in comparison to gram-negative bacteria.
Preparation of A High-Performance Frit Glaze Using High-Potassium Feldspar
Authors: Huang Hongjun , Yu Junjie , Liu Fangfang , Zeng Haipeng 
Published: January 2022

Abstract
In this study, a lead-free transparent frit glaze was fabricated using a high potassium feldspar ore from Northeast China. The effect of the potassium feldspar grade and compositions of CaO and ZnO content on the performance of a block glaze was studied. The study on the effects of the potassium feldspar grade on the molten glaze demonstrated that as the grade of the potassium feldspar in glaze increases, the glaze appearance, gloss, hardness, and thermal stability of the sample become better, and the roughness decreases. CaO and ZnO in glaze have good fusible effects on the performance of melt glaze: the high-temperature viscosity of glaze decreases, and the surface tension and quality of the glaze increase. Moreover, an optimal lead-free frit glaze formula was determined, which provided insight into the production of high-added-value products using complex and refractory potassium feldspar ore.
Analysis of potentials and problems of Semarang city
Authors: Ridlo M A , Ghiffari A 
Published: January 2022

Abstract
Spatial planning very important and dynamic in meeting the needs of space that continues to increase in line with the rate of population growth. Urban infrastructure becomes very important and crucial in directing the development of the city. For Semarang City, infrastructure needs to be addressed immediately, especially in spatial planning. Is carried out thoroughly and taking into account the existing problems and potential. Rationalistic qualitative methods become the methodology in this study. The analysis tools used were, among others, the Administrative approach and the development approach with an environmental and sustainable perspective. An administrative approach was also used by reviewing applicable laws and links with coastal areas, such as law number 26 of 2007 concerning spatial planning; law number 27 of 2007 concerning Management of Coastal Areas and Small Islands. While the development approach is environmentally friendly and sustainable, it is an attempt to approach it by looking at the real conditions of the potential and problems of coastal areas, based on aspects of environmental and sustainable values. Therefore, the government should in every set development policies pay attention to the preservation of natural resources and the environment.
The biodiversity richness of Mollusk species in Lanaga waters, Meureubo Subdistrict, Aceh Barat Regency, Aceh Province
Authors: Sarong M A , Rizal M , Kusumawati I , Mursawal A , Hermi R , Zulfikar  
Published: January 2022

Abstract
Mollusca are soft-bodied animals that are generally protected by shells, and have a variety of species richness in habitat, especially in Lanaga Waters, Mereubo Subdistrict, Aceh Barat Regency and need to be studied through research. The research objectives were (1) to assess the number of species of each class, and (2) to analyse the level of species richness of each class of molluscs, which are found in Lanaga Waters, Meureubo Sub-district, Aceh Barat district, Aceh Province. The research was carried out from January to March 2021, in Lanaga Waters. The research area was divided into three locations, each location was divided into five stations, and each station was assigned five sampling plots. Data were taken by using the purposive sampling technique. Data analysis of species richness level was analysed by richness formula, and analysis of data about the number of each species in each class was carried out descriptively. The results showed that (1) the species of Molluscs belonging to the Gastropod class were 9 species with a richness index, the Bivalvia class contained 2 species with a species richness index of 0.13 to 0.90 indicating that the level of species richness was low to high, in the Lanaga Waters area. Mereubo Subdistrict, Aceh Barat Regency, Aceh Province.
Acanthaster coral predator density in the Pulau Dua area, Aceh Selatan
Authors: Ningsih R Z , Huda I , Sarong M A , Fitri H 
Published: January 2022

Abstract
The crown of thorns starfish is one of the main threats to damage to coral reefs worldwide. Research on Acanthaster coral predator density in the Pulau Dua area, South Aceh district, has been carried out in March 2021, using the Line Intercept Transect (LIT) method. The results showed that the density Acanthaster planci obtained 42 individuals/12.000m2 with natural criteria. Corals fractures can support the life of Acanthaster planci substrate conditions dominated by coral fractures. It can also grow thread algae (Coraline) and encrusting algae, which will then be eaten by Acanthaster planci which are still in the larval stage. This research concludes that the density of Acanthaster planci obtained is still in the natural category with coral reef conditions including good criteria.
A Numerical Approach of the Influence of Water Temperature in the Extinction of Fire Developed in Closed Spaces
Authors: Cozma P , Pavel D , Safta C A , Chisacof A 
Published: January 2022

Abstract
The aim of this work is to make a visual investigation of the fire behavior during the extinguish process with water mist at different temperatures, different diameters of the nozzle and different angles of diffusion jet, too. It was used a numerical simulation approach to analyze 24 scenarios regarding the influence of mist water in fire extinguish process. The main test was focused on a given enclosure with dimensions of 1.0 × 1.0 × 3.0 m and the fire source placed inside, in the middle. The enclosure is considered opened on the upper part. From the numerical simulation values, we concluded the best scenario in fire extinguish process using water mist.
The effect of using different Biodiesel fuels on jet development in a Diesel engine
Authors: Niculae Andrei Laurentiu , Chiriac Radu , Racovitza Alexandru 
Published: January 2022

Abstract
The fuel properties and the injection rate-shape play an important role in the improvement of the combustion process of Diesel engines. In this work, the influences of using the forthcoming renewable biodiesel fuels on fuel jet development utilizing a computer simulation model created with the AVL Hydsim software were studied. Biodiesel fuels B20, B30 and B100 were considered and compared with the original pure Diesel fuel D100. The injection system behaviour under research was that one existing on a tractor engine equipped with Delphi DP200 pump and Delphi injectors. Two engine speeds of 1400 rpm and 2400 rpm were considered representative for the engine operation. For these speeds, the fuel jet characteristics as penetration, spray cone angle and Sauter mean diameter were analyzed. It can emphasize that in similar conditions of needle lift and injection rate-shape variation the usage of biodiesel fuels does not significantly alter the injection pressure and the Sauter mean diameter. However, the specific physical properties of biodiesel fuels affect substantially the spray penetration and its cone angle.
Assessment of the Miller cycle operation in a spark ignition engine via 1D numerical simulation
Authors: Punov P , Niculae M , Clenci A , Mihalkov S. , Iorga-Siman V , Danlos A 
Published: January 2022

Abstract
The article presents the results of a 1D numerical simulation of a spark ignition engine developed to operate in Miller cycle. Miller cycle offers better thermal efficiency compared to Otto cycle due to higher volumetric expansion than compression, which in the current context is of paramount importance. In an engine with fixed geometric compression ratio, Miller cycle operation could be realized by means of either early intake valve closing (EIVC) or late intake valve closing (LIVC). Both cases lead however to a lower volumetric efficiency, thus reducing the indicating mean effective pressure, which in its turn results to a lower power output. The simulation’s aim is not only to assess the impact of implementing the Miller cycle but also to obtain the necessary results for imposing the boundary conditions in a 3D CFD simulation whose purpose is to analyse the influence of the Miller cycle on the internal aerodynamics of the engine.
Challenges and performance evaluation of livestock waste energy content
Authors: Halmaciu I A , Ionel I , Vetres I , Balogh R M , Bisorca D 
Published: January 2022

Abstract
The global increase of the population has generated more and more requirement of the animal-based food. In order to provide this requirement, it was necessary to increase considerably the actual numbers of animals. This has led to both numerous positive and negative effects brought both to people and animals. Creating agro-touristic farms, ensuring fresh food, creating workplaces are just a part of the factors which have beneficial effects on the human beings. Yet, a major problem, which should not be ignored and neglected, is represented by the wastes resulted from animal breeding. These superficially treated wastes can cause numerous negative effects on the whole ecosystem. The animal dejections, the water resulted from the meat processing, the animal corpses, and all represent biodegradable wastes, which might be used, by transforming their energy content into electrical and thermal energy. This can be possible, for example, by using these wastes as raw material for producing biogas. To prove their efficiency in producing the biogases there have been done thermal analysis. In this article are analysed, from a thermal point of view, 3 different samples. In the first part of the experiment were analysed the swine dejections, in the second part were analysed the poultry dejections, and the third experiment consisted in the analysis of the cow stable waste. The analysis of these samples was done with the help of the Netzsch 449 C Jupiter device. The results obtained from the analysis prove the fact that all the three raw materials can be used as raw materials in producing the biogas.
The use of microtechnology’s in the construction of water aeration installations
Authors: Boltinescu (Roza) Marilena Monica , BĂran Nicolae , Roza Albertino Giovani , Constantin Mihaela 
Published: January 2022

Abstract
Water aeration systems are highly efficient if the dispersion of air in the water is carried out in a controlled and uniform manner. The use of fine bubble generators ensures this and in addition, creates a small loss of pressure when air passes through them. The paper demonstrates that producing as few air bubbles as possible leads to a more efficient aeration process. Two water aeration installations are compared:
- The first has a perforated plate with 152 orifices Ø 0.1 mm;
- The second has four perforated plates, each with 113 orifices Ø 0.05 mm;
Both installations are successively supplied with the same flow rate of compressed air, at the same temperature and at the same initial dissolved oxygen concentration in the water.