bluuebunny/crossref_metadata_2025 huggingface dataset:
On the syntax of correlation: Evidence from Egyptian Arabic
Authors: Soltan Usama
Published: May 2020

The goal of this paper is to describe and analyze the syntax of
two types of correlation structures (CSs) in Egyptian Arabic (EA): A structure
introduced by the quantifier kull (‘every’), and another introduced
by the measure PP ʕalā Ɂadd (literally, ‘on/by amount’). More
specifically, it is shown that both types of structures involve subordination, where
the first clause is subordinate to the second. A syntactic analysis along the lines
of den Dikken (2005) and Taylor (2013) for comparative correlatives is
first shown to account for the main grammatical properties of both types of CSs in
EA. A cartographic implementation of the analysis is then proposed to account for a
wider range of empirical data related to CSs, including their information structure
properties. The data and analysis presented in this paper thus add to the body of
empirical literature on CSs cross-linguistically, while showing that their
grammatical properties do follow under standard syntactic analysis, and that
analyzing such structures as ‘constructional’ primitives of the grammar is
unnecessary.
Clinical linguistic research in the study of Arabic diglossia
Authors: Khamis-Dakwar Reem
Published: May 2020

Clinical linguistics was first defined as the “application of
the theories, methods, and findings of linguistics (including phonetics) to the
study of those clinical situations where disorders of language are diagnosed and
treated” (Crystal, 1981: 1). Based on a
Question and Answer presentation at the International Clinical Phonetics and
Linguistics Association, Crystal called for more focused cross-linguistic
comparative studies in clinical linguistics (Crystal, 2013). Although clinical applications of linguistics are
emphasized in such studies, this kind of research may also add to theoretical
inquiries in linguistics and the field of Communication Sciences and Disorders
(CSD). This paper highlights the potential contributions of Arabic clinical
linguistic studies to CSD, through a description of two studies on diglossia and its
interactions with assessment and intervention services provided by speech-language
pathologists (SLPs) in different CSD populations. The paper provides a brief
overview of the SLP profession and its growth in the Arabic-speaking world, followed
by descriptions of two preliminary clinical linguistic studies of Arabic diglossia:
one focused on aphasia recovery in diglossic speech communities, and the other on
diglossic codeswitching in Arabic-speaking individuals with Autism Spectrum Disorders. These studies share a broad theoretical framework, and both exemplify the
relevance of linguistic theory and methods for investigations of
communication disorders in diglossia. Of particular interest is the promise of
systematic cross-dialectal investigations of communication disorders in line with
Crystal’s (2013) call for expansion of
deliberately designed comparative cross-linguistic studies in clinical
linguistics.
Theoretical investigation of a miniature microwave driven plasma jet
Authors: Klute Michael , Porteanu Horia-Eugen , Stefanović Ilija , Heinrich Wolfgang , Awakowicz Peter , Brinkmann Ralf Peter
Published: May 2020

Radio frequency driven plasma jets are compact plasma sources which are used in many advanced fields such as surface engineering or biomedicine. The MMWICP (miniature micro wave ICP) is a particular variant of that device class. Unlike other plasma jets which employ capacitive coupling, the MMWICP uses the induction principle. The jet is integrated into a miniature cavity structure which realizes an LC-resonator with a high quality factor. When excited at its resonance frequency, the resonator develops a high internal current which—transferred to the plasma via induction—provides an efficient source of RF power. This work presents a theoretical model of the MMWICP. The possible operation points of the device are analyzed. Two different regimes can be identified, the capacitive E-mode with a plasma density of n
e ≈ 5 × 1017 m−3, and the inductive H-mode with densities of n
e ⩾ 1019 m−3. The E to H transition shows a pronounced hysteresis behavior.
Temperature-dependent change of the fractal dimension of Cu dendrites on Cu(111)
Authors: Sprodowski C , Morgenstern K
Published: May 2020

We investigate the shape of monatomic high Cu islands on a Cu(111) surface by variable-temperature scanning tunneling microscopy between 110 K and 240 K. Low temperature dendrites evolve towards more compact shapes at increasing temperature; finally reaching the equilibrium shape of a hexagon with rounded corners. Time-lapsed imaging at increasing temperature reveals the onset of shape change to be at ≈170 K, corresponding to the onset of edge and corner diffusion of atoms along the island’s borders. Despite a substantial variation for individual islands at each temperature, the mean fractal dimension increases monotonously between 170 K up to 240 K, from the smallest to the largest values feasible for islands grown on surfaces.
Electrocaloric effect enhanced thermal conduction of a multilayer ceramic structure*
Authors: Liu Hongbo
Published: May 2020

The electrocaloric effect of ferroelectric ceramics has been studied extensively for solid-state caloric cooling. Generally, most ferroelectric ceramics are poor thermal conductors. In this work, the possibility of enhancing the thermal conduction of ferroelectric ceramics through the electrocaloric effect is studied. A multilayer ceramic structure is proposed and the proper sequential electric field is applied to each ceramic layer. The result shows that the thermal conduction of the multilayer structure is significantly enhanced because of the electrocaloric effect of the ferroelectric ceramics. As a result, the work finds an alternatively way of applying the electrocaloric effect, prompting thermal conduction.
Direct electron acceleration by chirped laser pulse in a cylindrical plasma channel*
Authors: Hu Yong-Nan , Cheng Li-Hong , Yao Zheng-Wei , Zhang Xiao-Bo , Zhang Ai-Xia , Xue Ju-Kui
Published: May 2020

We study the dynamics of single electron in an inhomogeneous cylindrical plasma channel during the direct acceleration by linearly polarized chirped laser pulse. By adjusting the parameters of the chirped laser pulse and the plasma channel, we obtain the energy gain, trajectory, dephasing rate and unstable threshold of electron oscillation in the channel. The influences of the chirped factor and inhomogeneous plasma density distribution on the electron dynamics are discussed in depth. We find that the nonlinearly chirped laser pulse and the inhomogeneous plasma channel have strong coupled influence on the electron dynamics. The electron energy gain can be enhanced, the instability threshold of the electron oscillation can be lowered, and the acceleration length can be shortened by chirped laser, while the inhomogeneity of the plasma channel can reduce the amplitude of the chirped laser.
Prognostics and health management of FAST cable-net structure based on digital twin technology
Authors: Li Qing-Wei , Jiang Peng , Li Hui
Published: May 2020

The Five-hundred-meter Aperture Spherical radio Telescope (FAST) will be fully commissioned later in 2019. Once commissioned, operation and maintenance of FAST will be the most prominent task. The unique working mode of active shape-changing of FAST cable-net structure makes the traditional maintenance way, which combines routine inspection with preventive maintenances not only expensive, but also unable to effectively avoid potential risks in operations. Therefore, it is necessary to develop an economical and reliable operation/maintenance technology for FAST cable-net structure. In this paper, a Prognostics and Health Management (PHM) system is proposed based on the advanced Digital Twin (DT) technology. Through the finite element analysis of DT model, the current safety status of FAST cable-net is evaluated, and the fatigue life of components in the cable-net is predicted. Hence Condition-Based Maintenance (CBM) of FAST cable-net structure can be realized. The PHM system described in this paper can effectively guarantee the healthy and safe operation of the FAST cable-net structure, greatly improve the maintenance efficiency and reduce the cost for maintenance works.
A motion planning algorithm for the feed support system of FAST
Authors: Yao Rui , Jiang Peng , Sun Jing-Hai , Yu Dong-Jun , Sun Chun
Published: May 2020

The paper relates to a motion planning algorithm for the feed support system of the Five-hundred-meter Aperture Spherical radio Telescope (FAST). To enhance the stability of the feed support system, the start/termination planning segments are adopted with an acceleration and deceleration section. The source switching planning adopts a combination of a line segment and focal segment to realize stable control of the feed support system. Besides, during the observation trajectory, a transition segment which is not used for observation data is planned with a required time. Through an example simulation, a smooth change is realized via the motion planning algorithm and presented in this paper.
Simulation of FAST EM performance for both the axial and lateral feed defocusing
Authors: Gan Heng-Qian , Jiang Peng , Zhu Kai , Sun Jing-Hai , Yao Rui , Yu Dong-Jun
Published: May 2020

Five-hundred-meter Aperture radio Spherical Telescope (FAST) is the world’s largest single dish radio telescope, which is located in Guizhou Province, in southwest China. The FAST feed cabin is supported and positioned by six steel cables. The deviation of the feed position and orientation would lead to loss in the telescope efficiency. In this paper, a series of electromagnetic (EM) simulations of the FAST facility with varying feed positions and orientation offsets was performed. The maximum gain of FAST is about 82.3 dBi and the sibelobe is –32 dB with respect to the main beam at 3 GHz. The simulation results have demonstrated that the telescope efficiency loss is more sensitive to the lateral feed deviation compared with the axial deviation. The telescope efficiency would decrease by 8.2% due to the FAST feed position deviation of 10 mm rms when the observing frequency is 3 GHz. The FAST feed deviation basically has no effect on the sidelobes and cross polarization characteristic according to the simulations.
Design and optimization of cross bow-tie dipole feed with cavity for FAST
Authors: Yu Jing-Long , Yue You-Ling , Li Jian-Bin
Published: May 2020

A cross bow-tie dipole feed with cavity and symmetrical E and H plane pattern is presented for the Five hundred-meter Aperture Spherical radio Telescope (FAST). In this paper we describe the design, optimization and simulation results of a wide-band cross dipole feed with cavity covering the frequency range from 300 MHz to 600 MHz for FAST. The main goals of our design are to ensure that, (1) we cover the octave bandwidth, (2) the feed has symmetrical E and H plane pattern, and (3) the physical dimension is suitable for mounting it in the reserved position of the FAST feed cabin. The initial results indicate that we have met most of our design goals. This kind of feed had been equipped with the multi-beam receiver to carry out observation on the platform of FAST cabin.
Development of wideband orthomode transducers for FAST cryogenic receiver system
Authors: Fan Jin , Zhu Kai , Gan Heng-Qian , Jiang Peng , Yang Jian , Cao Yang , Liu Hong-Fei , Zhang Hang , Guo Ming-Lei , Shi Xiang-Wei
Published: May 2020

This paper describes the design, construction, and performance of the wideband orthomode transducers (OMTs) for the L- (1.2–1.8 GHz), the S- (2–3 GHz) and the P- (0.56–1.12 GHz) band receiver systems of the Five-hundred-meter Aperture Spherical radio Telescope (FAST). These OMTs operate at the cryogenic temperature of 70K to reduce their thermal noise contribution to the receiver chains. The development on the FAST L- and S-band quad-ridged waveguide (QRWG) OMTs is carried out based on the theoretical mode analysis. In view of the miniaturization of FAST cryogenic receiver system at P-band, a novel wideband compact bowtie dipole OMT is designed with an octave bandwidth as well as a length of only quarter wavelength. The proposed L-, S- and P-band OMTs are designed and optimized by using Ansys High Frequency Structure Simulator (HFSS), and then manufactured, tested at room temperature. Measurement of FAST cryogenic receiver system noise is also performed with the L-, S- and P-band OMTs installed. The measured results fully comply with the design specifications.
The time and frequency standard system for FAST receivers
Authors: Zhu Kai , Fan Jin , Liang Kun , Tang Wei , Gao Zhi-Sheng , Zhu Yan , Feng Yi , Zhu Wei-Wei , Qian Lei , Yue You-Ling , Song Jin-You , Shi Xiang-Wei , Wang Xing-Yi , Guo Ming-Lei , Zhang Hang , Gan Heng-Qian , Liu Hong-Fei , Jin Cheng-Jin , Jiang Peng
Published: May 2020

This paper reports on the time and frequency standard system for the Five-hundred meter Aperture Spherical radio Telescope (FAST), including the system design, stability measurements and pulsar timing observations. The stability and drift rate of the frequency standard are calculated using 1-year monitoring data. The UTC-NIM Disciplined Oscillator (NIMDO) system improves the system time accuracy and stability to the level of 5 ns. Pulsar timing observations were carried out for several months. The weighted RMS of timing residuals reaches the level of less than 3.0 μs.
Opportunities to search for extraterrestrial intelligence with the FAST
Authors: Li Di , Gajjar Vishal , Wang Pei , Siemion Andrew , Zhang Zhi-Song , Zhang Hai-Yan , Yue You-Ling , Zhu Yan , Jin Cheng-Jin , Li Shi-Yu , Berger Sabrina , Brzycki Bryan , Cobb Jeff , Croft Steve , Czech Daniel , DeBoer David , DeMarines Julia , Drew Jamie , Emilio Enriquez J. , Gizani Nectaria , Korpela Eric J. , Isaacson Howard , Lebofsky Matthew , Lacki Brian , MacMahon David H. E. , Nanez Morgan , Niu Chen-Hui , Pei Xin , Price Danny C. , Werthimer Dan , Worden Pete , Gerry Zhang Yunfan , Zhang Tong-Jie , Collaboration FAST
Published: May 2020

The discovery of ubiquitous habitable extrasolar planets, combined with revolutionary advances in instrumentation and observational capabilities, has ushered in a renaissance in the search for extraterrestrial intelligence (SETI). Large scale SETI activities are now underway at numerous international facilities. The Five-hundred-meter Aperture Spherical radio Telescope (FAST) is the largest single-aperture radio telescope in the world, and is well positioned to conduct sensitive searches for radio emission indicative of exo-intelligence. SETI is one of the five key science goals specified in the original FAST project plan. A collaboration with the Breakthrough Listen Initiative was initiated in 2016 with a joint statement signed both by Dr. Jun Yan, the then director of National Astronomical Observatories, Chinese Academy of Sciences (NAOC), and Dr. Peter Worden, Chairman of the Breakthrough Prize Foundation. In this paper, we highlight some of the unique features of FAST that will allow for novel SETI observations. We identify and describe three different signal types indicative of a technological source, namely, narrow band, wide-band artificially dispersed and modulated signals. Here, we propose observations with FAST to achieve sensitivities never before explored. For nearby exoplanets, such as TESS targets, FAST will be sensitive to an EIRP of 1.9 × 1011 W, well within the reach of current human technology. For the Andromeda Galaxy, FAST will be able to detect any Kardashev type II or more advanced civilization there.
Recent progress in developing efficient monolithic all-perovskite tandem solar cells
Authors: Wang Yurui , Zhang Mei , Xiao Ke , Lin Renxing , Luo Xin , Han Qiaolei , Tan Hairen
Published: May 2020

Organic–inorganic halide perovskites have received widespread attention thanks to their strong light absorption, long carrier diffusion lengths, tunable bandgaps, and low temperature processing. Single-junction perovskite solar cells (PSCs) have achieved a boost of the power conversion efficiency (PCE) from 3.8% to 25.2% in just a decade. With the continuous growth of PCE in single-junction PSCs, exploiting of monolithic all-perovskite tandem solar cells is now an important strategy to go beyond the efficiency available in single-junction PSCs. In this review, we first introduce the structure and operation mechanism of monolithic all-perovskite tandem solar cell. We then summarize recent progress in monolithic all-perovskite tandem solar cells from the perspectives of different structural units in the device: tunnel recombination junction, wide-bandgap top subcell, and narrow-bandgap bottom subcell. Finally, we provide our insights into the challenges and scientific issues remaining in this rapidly developing research field.
Comprehensive first-principles studies on phase stability of copper-based halide perovskite derivatives AlCumXn (A = Rb and Cs; X = Cl, Br, and I)
Authors: Sun Zhongti , Chen Xiwen , Yin Wanjian
Published: May 2020

Recently, inorganic copper-based halide perovskites and their derivatives (CHPs) with chemical formulas A
l
Cu
m
X
n
(A = Rb and Cs; X = Cl, Br and I; l, m, and n are integers.), have received increasing attention in the photoluminescence field, due to their lead-free, cost-effective, earth-abundant and low electronic dimensionality. Ascribed to flexible valence charge of Cu (Cu1+ and Cu2+) and complex competing phases, the crystal structures and phase stabilities of CHPs are complicated and ambiguous, which limits their experimental applications. Via comprehensive first-principles calculations, we have investigated thermodynamic stabilities of possible crystal phases for A
l
Cu
m
X
n
by considering all the possible secondary phases existing in inorganic crystal structure database (ICSD). Our results are in agreement with existing experiments and further predicted the existence of 10 stable CHPs, i.e. Rb3Cu2Br5, Rb3Cu2I5, RbCu2Cl3, Rb2CuI3, Rb2CuBr4, RbCuBr3, Rb3Cu2Br7, Cs3Cu2Br7, Cs3Cu2Cl7 and Cs4Cu5Cl9, which have not yet been reported in experiments. This work provides a phase and compositional map that may guide experiments to synthesize more novel inorganic CHPs with diverse properties for potential functional applications.
Estimation on Pressure and Velocity Parameter in the Fuel Handling Pneumatic Design of RDE
Authors: Dibyo Sukmanto , Setiadipura Topan , Pancoko Marliyadi
Published: May 2020

The RDE is small size of High Temperature Gas-Cooled Reactor type. It’s being designed that have a power of 10 MW thermal, which is intended to produce the electricity and heat utilization. The reactor uses helium gas as a system of coolant at the pressure of 3.0 MPa. The fuel pebble of spherical shape are transported by the pneumatic system in the pipes and recharged from the reactor core continuously without shut-down the reactor. During the process of transportation, the fuel pebble is lifted perpendicularly along the pipe into the reactor core. Therefore, fuel pebble transportation in the pneumatic system is an important effect to stability the fuel handling operation. This paper to estimate the fuel pebble velocity through a vertical pipe with respect to the pressure of pneumatic system in the design of RDE. The pneumatic vertical pipe has 23 m length, 65 mm inner diameter and fuel pebble of 60 mm diameter, weight of one fuel pebble is 200 gr and contains an uranium kernel coated in matrix graphite. The pneumatic system of carrier gas compressed as the conveying medium must be able to transport the fuel pebble through the pneumatic pipe one by one continuously, so that it could be loaded into the reactor core safely. In the pneumatic conveying, the general equation for the velocity of an object movement, drag force of flow and Bernoulli principle were used in the analysis. An initial velocity in range of 20 to 23 m/s was analysed, meanwhile, the fuel pebble discharged from the pneumatic pipe was determined at low velocity around of 0.1 to 5.0 m/s. In this case a collision at high velocity with the reactor core that causes pebble damage can be avoided. Result shows that the pneumatic transportation for the operational requirements of the fuel handling system when the carrier gas pressure in the range of 0.09 to 0.11 MPa higher than the reactor pressure system. In order to perfectly calculation in the future, it will consider the drag coefficient on the fuel pebble with a pipe wall.
Design Conceptual of 800MWt Long Life Pressurized Water Reactor Using (Th-U)O2 Fuels with Gd2O3 and Pa-231 as Burnable Poisons
Authors: Hariyanto Duwi , Permana Sidik
Published: May 2020

A long-life pressurized water reactor (PWR) has been reviewed as an innovative reactor design that can fulfill electricity demand. This study aimed to find out the optimum design of 800MWt long life PWR using Thorium-Uranium dioxide (Th-U)O2 fuels with Gadolinium (Gd2O3) and Protactinium-231 (Pa-231) as the burnable poisons. An established computer code of SRAC 2006 with JENDL 4.0 as data nuclear library had been used for the analysis. A two-dimensional R-Z geometry and fuel volume fraction of 40% were used for core geometry analysis. The different fraction of Uranium dioxide, Uranium-235, Gadolinium, and Protactinium-231 had been carried out. The result of this study was a design of PWR 800MWt using Uranium dioxide fuel of 60% with enrichment 11%-12%-13% Uranium-235 and the addition of 0,025% Gd2O3 and 1,0% Pa-231 that could operate for ten years without refueling. The reactor could produce a power density of 45,4 watts/cc with excess reactivity about 3,6% dk/k. This study is expected to be a reference for a long-life pressurized water reactor using the Thorium-Uranium fuel cycles.
Simulation of VMAT (Volumetric Modulated Arc Therapy) Delivery techniques on Cylinder Phantom Based on DICOM Data using Monte Carlo Method - EGSnrc
Authors: Ramdani Ridwan , Kurniawati Dian , Perkasa Yudha Satya , Subkhi Moch Nurul , Syajaah Khoerun Nisa , Rhani Mohamad Fahdillah , Haryanto Freddy , Yani Sitti
Published: May 2020

This research aims to study one of the radiotherapy techniques of VMAT and calculate the dose distribution on phantom cylinders using the Monte Carlo EGSnrc method. VMAT is one of radiotherapy technique where is all the fractions of the dose are given continuously when the gantry rotates around the patient with manages gantry rotation speed, MLC leaf position and the dose fraction is given. The simulation process begins with head linac modeling using BEAMnrc, and using the Monte Carlo VMAT simulation uses DOSXYZnrc software. The parameters for the BEAMnrc and DOSXYZnrc simulations using information from DICOM data set rtplan AAA are read using the pycom code. The results of this study provide information about the characteristics of 6 MV photon files such as fluence, fluence energy, spectral distribution, and fluence energy distribution, and dose distribution in phantom cylinders. The VMAT Monte Carlo simulation was carried out using 300 million particles which resulted in a VMAT dose distribution in the form of a dose profile curve and an isodose curve, the result shows that the curve of VMAT simulation using phantom cylinders produced the maximum dose distribution in the isocenter
Assessment of Gamma and Neutron Dose of Optimizing the Radiation Protection in TRIGA 2000 BATAN Bandung.
Authors: Oméga Rakotovao Lovanantenaina , Permana Sidik , Oetami Rini Heroe , Rasito
Published: May 2020

The TRIGA 2000 reactor is a nuclear installation which is operated at 1000 kW. Gamma and neutron radiation exposure will contribute to occupational doses that will be received by operators and other radiation workers. To maintain the safety of radiation workers, assessment of gamma and neutron radiation is needed in the TRIGA 2000 reactor. survey in the hall reactor using the RTD 30 and RadEye NL detectors. In addition to the direct measurement, calculations are also carried out with simulation data dose using Monte Carlo MCNPX for the calculation and followed by PHITS to get the graphical dose distribution of gamma and neutron. The study will focus on the assessment of the diffusion Gamma and neutron doses by doing the measurement and simulation data collect for the aim of the optimization of the Radiation protection policy in the reactor TRIGA 2000 Bandung. The result of the measurement is shown with graph in different power taken during the measurement and the simulation is the graphical distribution dose of gamma and neutron using PHITS code. A preventive dose reduction technique, worker and publics protection elaborate to optimise the Radiation protection program.
Fast Nuclear Reactor Fuel Depletion Analysis Using Fourth Order Runge-Kutta Method
Authors: Mulyadi Lutfi , Su’ud Zaki
Published: May 2020

Calculation of fuel depletion involved processing of nuclear data as a microscopic cross section. Macroscopic cross section calculations were performed by multiplying the microscopic cross sections by the density of the nuclide and all materials involved in the reactor itself. Diffusion equation calculations were performed in a two-dimensional cylindrical coordinate system, which involved macroscopic cross sections to obtain the distribution of neutron fluxes, neutron source densities, power densities, and k-eff. The calculation resulted in the k-eff of 1,0017918649. Thus, we concluded that the reactor was in super critical condition. Next, we used the maximum flux to be calculated in the depletion equation to get a new nuclide density for 10 years. The process of calculating depletion involved a system of twenty-eight differential equations, obtained from the nuclear transmutation chain. It took a long time and was difficult to solve analytically. In this research, the system of differential equations was numerically solved by the Fourth order Runge-Kutta Method to get the nuclide density curve with respect to time.
A Comparative Study of Th-U233 and Th-Pu Molten-Salt Reactor (MSR) with 2-region core
Authors: Ifthacharo M , Permana S , Saputra G
Published: May 2020

Sustainable closed fuel cycle and inherent safety are one of the key aspects of Generation IV reactor design. Hence Molten salt reactor (MSR) is chosen as one of the candidates of Generation IV reactor concepts. FUJI-U2 or MSR-2R is a 2-region core MSR design that was proposed as a possible simplification of FUJI-U3 (3-region core). Taking into consideration that uranium−233 doesn’t exist naturally, FUJI-U2 utilize both plutonium and uranium−233 as a fissile material. To understand the characteristics further, a comparative study of 2-region core MSR with Th-U233 and Th-Pu as fuel has been carried out. Nuclear analysis code SRAC2006 with the nuclear data library of JENDL4.0 was used, and CITATION was employed to validate the core. The design parameters set for each region are fuel composition, core radius, and fuel fraction. The simulation burn up calculation is set to 2000 days in total, with 21 step each for 100 days cycle. Neutron multiplication factor, fuel elemental, burn up calculation, conversion ratio, and neutron flux in each core will be discussed.
Comparison of Irradiation Effect of ThO2 and ThZrH on Neutronic Parameter of the TRIGA 2000 Reactor
Authors: Rasito  , Permana S. , Ilham Y. P.
Published: May 2020

The present work discusses two different models of thorium irradiation in the TRIGA 2000 reactor core to compare the neutronic characteristics of irradiation of thorium dioxide (ThO2) and thorium zirconium hydride (ThZrH). The Monte Carlo N-Particle (MCNP) Transport code, based on the Monte Carlo method, is used to design three dimensional models for TRIGA reactor core at typical operating power 2 MW. These models are used to determine the effective multiplication factor (keff) and neutron flux distribution. The ORIGEN code is used to calculate the 233U isotope production. It is found that decreasing of keff from the effect of hydride irradiation rod is a little lower than the oxide irradiation rod.
Evaluation of the Pump Capability of the Primary Cooling of TRIGA 2000 Research Reactor
Authors: Umar E. , Kamajaya K. , Ramadhan A.I.
Published: May 2020

The TRIGA 2000 research reactor has been operating since mid 2000. Currently, there are plans to convert the reactor core from cylindrical fuel element to plate type fuel element. The conversion process is expected to not change too many existing systems, including the primary cooling systems. For this reason, it is necessary to evaluate the pump capability of the primary cooling system. Based on experimental studies, then merging with the existing installation system head, it has been obtained the main and the redundant pump mass flow rate of 45 and 45.5 kg/s, respectively. The pump capability decreased by around 5 % compared to the results of its commissioning. If the two pumps are combined in parallel, the combined mass flow rate can increase to 62 kg/s. The existing primary pumps cannot be used for primary cooling system if the reactor core is converted into a plate type, even though both pump are installed in parallel. These results need to be considered in designing a new core of the Bandung TRIGA 2000 research reactor with primary cooling systems that are slightly modified because they have to add the decay tank.
Actinide Minor Addition on Uranium Plutonium Nitride Fuel for Modular Gas Cooled Fast Reactor
Authors: Syarifah Ratna Dewi , Su’ud Zaki , Basar Khairul , Irwanto Dwi
Published: May 2020

This study has made a calculation of Actinide Minor Addition on Uranium Plutonium Nitride Fuel for Modular Gas Cooled Fast Reactor. The purpose of this study was to determine the characteristics of minor actinides when incorporated into plutonium nitride uranium fuel. Neutronics calculation was design by using SRAC Code version 2006 (Standard Reactor Analysis Code) with the data nuclides from JENDL-4.0 under the Linux Operating System with nuclear data library JENDL4.0. Neutronic calculations were done through some steps of parameter survey to obtain the ultimate optimization results. The initial calculation was calculation of fuel cell (PIJ calculation) by using hexagonal cell and then followed by calculation of core reactor (CITATION calculation) by using program code SRAC2006. The addition of minor actinide has been calculated in this research. The minor actinides which were added were americium (Am-241 and Am-243) and neptunium 237. They were put into the uranium plutonium nitride material to decrease the k-eff value. The addition of minor actinide into the reactor aimed to reduce the number of minor actinides in the world. Minor actinide is a nuclear waste fuel or often called spent nuclear fuel (SNF) which has high toxicity. Neptunium 237 is a minor actinide with the highest percentage of SNF.
Investigation of Zirconium Carbide Ceramic Coating on Surrogate Kernels Deposited by Plasma-Pulsed Laser Deposition: A Preliminary Study
Authors: Rivai Abu Khalid , Mardiyanto  , Dimyati Arbi , Sumaryo  , Sugeng Bambang , Shabrina Nanda
Published: May 2020

High Temperature Gas-cooled Reactor (HTGR) is one of advanced nuclear reactors with high safety system feature. Indonesia has a plan to build HTGR as an Experimental Power Reactor (in Indonesian: RDE - Reaktor Daya Eksperimental). One of the safety system feature is its fuel system. There are two types of fuel of HTGR i.e. pebble bed type and prismatic type which all of the types are containing TRISO (Tri-Structural Isotropic) which consist of Inner Pyrolitic Carbon, SiC (Silicon Carbide) dan Outer Pyrolitic Carbon. One of the issues of the system is silver (Ag) and palladium (Pd) as the fission product could interact with SiC layer and cause corrosion. One of the candidate to resolve the issue is to replace SiC with ZrC (Zirconium Carbide). In this preliminary study, Zirconium Carbide ceramic has been deposited on a surrogate (uranium-free) fuel microkernels using PLD Plasma-Pulsed Laser Deposition. The parameter during ZrC deposition were temperature of 850°C for the substrate, the number of laser shots of 90,000 and the oxygen background gas with 40 sccm (standard cubic centimeters per minute) with the chamber pressure of 235 mTorr. Thereafter, the samples were analyzed using OM - Microscope Optic, SEM-EDS - Scanning Electron Microscope – Energy Dispersive X-ray Spectroscope, XRD – X-Ray Diffractometer and AFM – Atomic Force Microscope. The results exhibited that the ceramic coating could deposited on the surface of the substrate surface with homogeneously and sticky. The surface was very smooth within the nano-meter range order of ∼80-120 nm of surface roughness. Nevertheless, the results indicated that some of ZrC was react with oxygen at high temperature on the surface of the sample and deposited on the surface of surrogate microkernels.
The Effect of Temperature Variations on Wood’s Metal Plate Melting Simulation by Using MPS
Authors: Hidayati Anni Nuril , Waris Abdul , Andi Mustari Asril Pramutadi , Apriani Nur Asiah , Ifthacharo Melati , Wulandari Rindi
Published: May 2020

Two-dimensional simulation of Wood’s Metal Plate (WMP) Melting Process has been conducted by varying the molten temperature. This simulation was performed by using Moving Particle Semi-Implicit (MPS) method which can calculate the Navier-Stokes and heat transfer equation without divining mesh system. As a substitute, particles are selected to represent every part of simulation such as fluid, wall and dummy type. The experiment of WMP melting process has been conducted by Sudha (2018). The molten Wood’s Metal was originally set at 573 K. In this simulation, the holes formation in WMP will be investigated as a consequence of molten temperature variation. Furthermore, temperature distribution at top side of WMP and solid-liquid phase change will be analyzed for initial temperature of molten are 523 K, 473 K and 423 K. The results show that the phases change significantly in a short time when the molten temperature is increased. However, until the end of simulation which on 1.5 s just for molten temperature 573 K shows the breaching process to the WMP. This study can be implemented when the reactor nuclear severe accident happened.
Thermodynamics and Structural Properties of Ti3SiC2 in Liquid Lead Coolant
Authors: Arkundato Artoto , Hasan Moh , Pramutadi Asril , Rivai Abu K. , Su’ud Zaki
Published: May 2020

It has been investigated by molecular dynamics method the effect of oxygen injection for Ti3SiC2 corrosion inhibition when this material immersed into high temperature liquid lead coolant. The diffusion coefficient of Ti3SiC2 was determined from mean-square-displacement simulation data. The structures of Ti3SiC2 during corrosion inhibition using oxygen agent were observed by Ovito vizualisation code. The simulations have been done using the Moldy molecular dynamics code. Initial material structure as input of simulation generated by Atomsk, Packmol and VESTA codes based on “file 1520829.cif” format file that taken from the crystallography open database (CoD) website. It is from our work we can show that injecting oxygen with concentration about 0.15 – 0.19 wt%, it seems can stabilize the structure of Ti2SiC3 maximally.
Neutronic Aspect Assessment on the use of ZrC Triso-Coated Particle (TRIZO) in a High-Temperature Gas-cooled Reactor (HTGR)
Authors: Miftasani Fitria , Su’ud Zaki , Irwanto Dwi
Published: May 2020

Neutronic calculation has been performed to high-temperature gas-cooled reactor (HTGR) that uses ZrC Triso-coated particle (TRIZO). TRIZO is the most reliable alternative to replace the SiC coating on coated fuel particles because of its superiority in resistance to high temperatures and resistance during the irradiation process. Neutronic aspect analysis of HTGR was carried out by calculating the k-inf and k-eff values on ZrC and SiC coating layers. The materials used were based on the Tri-isotropic (TRISO) coated particle standard used in HTTR 30 MWt, with uranium dioxide and thorium dioxide fuels based. The neutronic aspect with different fuels use ZrC coating layer is also investigated. The calculation shows similar behavior between thorium dioxide and uranium dioxide fuel with ZrC and SiC coating layer. The k-inf and k-eff with ZrC coating layer are lower than the SiC coating layer in both fuels. This value is related to the number of ZrC’s capture cross-section. Comparison between thorium dioxide and uranium dioxide fuel shows that thorium dioxide fuel has higher k-eff and k-inf with ZrC coating layer.
Spatial mapping of short-term solar radiation prediction incorporating geostationary satellite images coupled with deep convolutional LSTM networks for South Korea
Authors: Yeom Jong-Min , Deo Ravinesh C , Adamowski Jan F , Park Seonyoung , Lee Chang-Suk
Published: May 2020

A practical approach to continuously monitor and provide real-time solar energy prediction can help support reliable renewable energy supply and relevant energy security systems. In this study on the Korean Peninsula, contemporaneous solar radiation images obtained from the Communication, Ocean and Meteorological Satellite (COMS) Meteorological Imager (MI) system, were used to design a convolutional neural network and a long short-term memory network predictive model, ConvLSTM. This model was applied to predict one-hour ahead solar radiation and spatially map solar energy potential. The newly designed ConvLSTM model enabled reliable prediction of solar radiation, incorporating spatial changes in atmospheric conditions and capturing the temporal sequence-to-sequence variations that are likely to influence solar driven power supply and its overall stability. Results showed that the proposed ConvLSTM model successfully captured cloud-induced variations in ground level solar radiation when compared with reference images from a physical model. A comparison with ground pyranometer measurements indicated that the short-term prediction of global solar radiation by the proposed ConvLSTM had the highest accuracy [root mean square error (RMSE) = 83.458 W · m−2, mean bias error (MBE) = 4.466 W · m−2, coefficient of determination (R2) = 0.874] when compared with results of conventional artificial neural network (ANN) [RMSE = 94.085 W · m−2, MBE = −6.039 W · m−2, R2 = 0.821] and random forest (RF) [RMSE = 95.262 W · m−2, MBE = −11.576 W · m−2, R2 = 0.839] models. In addition, ConvLSTM better captured the temporal variations in predicted solar radiation, mainly due to cloud attenuation effects when compared with two selected ground stations. The study showed that contemporaneous satellite images over short-term or near real-time intervals can successfully support solar energy exploration in areas without continuous environmental monitoring systems, where satellite footprints are available to model and monitor solar energy management systems supporting real-life power grid systems.
Casimir effect for impurity in periodic background in one dimension
Authors: Bordag M
Published: May 2020

We consider a Bose gas in a one-dimensional periodic background formed by generalized delta function potentials with one and two impurities. We investigate the scattering off these impurities and their bound state levels. Besides expected features, we observe a kind of long-range correlation between the bound state levels of two impurities. Further, we define and calculate the vacuum energy of the impurity. It causes a force acting on the impurity relative to the background. We define the vacuum energy as a mode sum. In order to get a discrete spectrum we start from a finite lattice and use Chebychev polynomials to get a general expression. These allow also for quite easy investigation of impurities in finite lattices.
Content-based Re-ranking Method for Recommendation
Authors: Huang Xin , Bai Jiameng , Peng Jia , Li Min
Published: May 2020

The recommendation system is one of the effective tools to solve information overload. Most of the current deep learning recommendation algorithms only focus on the accuracy of the recommendation results by learning users’ preferences. However, the diversity of the recommendation results is neglected, resulting in homogeneous recommendation results, which reduces users’ satisfaction. Diversity can not only effectively avoid over-fitting, but also comprehensively consider multiple dimensions to improve the quality of recommendation results. Therefore, we propose a content-based re-ranking method (CBR) for recommendation systems. The proposed method can make full use of the data set, and effectively supplement and re-rank the recommended results produced by some deep learning algorithms based on the edge information such as tags to be recommended from different perspectives, thus can effectively improve the diversity while preserving the accuracy of recommendation results. Experimental results demonstrate the significant improvements of the proposed re-ranking method.
Design and Implementation of Launching Subsystem of a Radar Parameter Measurement Simulation Training Platform
Authors: Wang Jun , Deng Bin , Li Chuanqi , Li Yiyuan
Published: May 2020

This paper introduces the design and implementation of the launch subsystem of a radar performance measurement simulation training platform. First, the main functions of the launch subsystem of the platform are determined according to the training requirements of the outline for measuring the radar performance parameters of the troops, including test items and technical indicators; then, comb the launch subsystem analog circuit of work process; finally, the design method of each functional circuit is introduced in detail. The practical application results are given. The launch subsystem of the simulation training platform can realistically simulate the performance parameter measurement training of the radar real launch subsystem. In addition, it can compare the feedback measurement results with the designed indexes, meet the training requirements of radar equipment support personnel, and increase the means of training and integration. Ensuring training time and enhancing support capability can effectively solve the problems of too many personnel and planes and equipment damage in actual training.
Numerical Simulation of the Plane Electromagnetic Wave Transient Propagation in Lossy Medium
Authors: Gao Li , Li Mingjun , Liu Feng , Zhang Lulu
Published: May 2020

In the field of geophysical exploration, it is of great value to study the transient propagation characteristics of electromagnetic waves in lossy medium. The equations of electric field and magnetic field are derived. The absorbing boundary conditions and numerical stability conditions are analyzed. The two-layer medium model is established to simulate the propagation characteristics of plane waves. The simulation results show that the transient analysis of electromagnetic wave propagation can reflect the time fluctuation characteristics of electromagnetic field in multilayer media, and provide the indication of the boundary position.
A Reconstructing Minimization Approach for Total Variation Based Transient Electromagnetic Inversion
Authors: Rao Liting
Published: May 2020

Transient electromagnetic (TEM) data are conveniently inverted to visualized underground structure with the widely used Occam’s inversion. However, in sedimentary environments, Occam’s inversion performs poorly in reproducing the sharp boundaries. This issue can be overcome by adopting total variation (TV) regularization. The existing computational methods for TV-based regularization are more complex than Occam’s inversion, which limits the application of TV-based regularization in TEM inversion. Here, we develop a reconstructing minimization (RM) approach for TV-based transient electromagnetic inversion. The TV stabilizer is reconstructed as the weighted squared L2-norm of a kernel function. The obtained iterative model update expression of TV-based inversion is extremely close to that of Occam’s inversion, which is rather simple to implement. Synthetic examples validate the efficiency and accuracy of the proposed RM approach.
Analysis of Key Security Technologies for Power Dispatch Control System of Power Dispatch Support System
Authors: Siming Zhou , Guanqiang Liu , Hai Qin , Tian Xia
Published: May 2020

The scale of China’s power grid is continuously expanding, the amount of collected data is increasing rapidly, and data processing and analysis services are developing towards clustering. Therefore, at present, task management in a stand-alone mode faces severe challenges in ensuring the high efficiency and reliability of distributed tasks. Information security risks in cyberspace can cause fatal threats to smart grid entities through the destruction of grid dispatching control systems and communication networks. Security check is one of the application functions of intelligent power dispatching control system. It is an important security defense line to ensure the stable operation of power grid and provides security check service for power grid dispatching plan and power grid operation. The existing operation and maintenance management mode of the power grid dispatching control system is distributed, and the data of each system and unit is not effectively integrated and connected, and lacks overall consideration. Based on the development history of power grid dispatching automation, this paper comprehensively analyzes the current status of the overall structure of the power grid dispatching system, and summarizes the key technology innovations and application effects.
Research on Application of Digital Signal Processing Technology in Communication
Authors: Lu Huang , Xiaoyu Yuan , Haodong Wang , Jin Li , Xuejiao Ma , Caihong Zhang
Published: May 2020

With the continuous development of modern information technology and the continuous improvement of people’s living standards, electronic information technology has been widely used in people’s lives. People’s lives are inseparable from it. With its continuous development, its application range is getting wider and wider. This article first gives a brief overview of digital signal processing technology, analyzes the advantages and disadvantages of digital signal processing technology in the communication field, and the specific applications of speech compression coding and software radio in communication are analyzed in order to better promote the application of digital signal processing technology in the communication field.
Research on WT-SVD Bilayer Filter Denoising for Downhole Signal
Authors: Yang Yuyan , Huo Aiqing , Qi Feng
Published: May 2020

Aiming at the problem of singularity and mutation points after wavelet denoising with improved layered threshold when denoising the downlink signal received in the downhole in rotary steering drilling, a bilayer filtering denoising method based on singular value decomposition is proposed. This method combines wavelet denoising and singular value decomposition denoising, and adopts the WT-SVD bilayer filtering denoising method to construct a matrix of the wavelet improved layered threshold denoising signal, and then performs singular value decomposition and recovery on the matrix signal. The number of selected singular values and the structure of the reconstruction matrix were determined through experiments, and the signal waveforms, signal-to-noise ratio, root mean square error and correlation coefficients of three different denoising methods including singular value decomposition, wavelet improved layered threshold and WT-SVD bilayer filtering are compared and studied. The final experimental results show that the WT-SVD bilayer filtering denoising method is effective.
Research on characteristic parameters of acoustic actuator radiation plate
Authors: Li Zhouli , Qian Cailing , Shi Kaikai
Published: May 2020

As the final output element of the magnetostrictive actuator, the material, size and shape selected by the radiant plate will affect the output efficiency of the actuator directly. Based on the theoretical analysis on natural frequency of thin circular plate and thick circular plate with peripheral fixing-supported, the result shows that the ratio of the thickness of circular plate to the square of its radius can be determined by material and vibration mode of the circular plate, and in portion to its natural frequency . when frequency of circular plate and circular plate vibration mode shapes are selected, the ratio of the thickness to the area of the circular plate is constant, which provides the basis for acoustic actuator radiation plate geometric design.