bluuebunny/crossref_metadata_2025 huggingface dataset:
Ontogenetic structure of lichen populations as the index of the condition of the urbanized territories
Authors: Il’ina Valentina , Mitroshenkova Anna , Nalivayko Irina , Husnutdinova Ludmila
Published: December 2019

The results of population monitoring in lichen indication promote the detection of resistance of lichen species to the pollution of environment. The population of Xanthoria parietina (L.) Th. Fr. on the territory of the city of Samara and in the neighborhood of the Bolshaya Glushitsa settlement (Bolsheglushitsky district, Samara region) (Russia) were studied. For identification of ontogenetic conditions of talluses, the approaches and a nomenclature of population and ontogenetic researches of Magnoliophyta were used. Taking into account the exposition, the projective cover of Ulmus pumila trunks with Xanthoria parietina talluses was revealed. On Ulmus pumila tree stems in the Bolshechernigovsky municipal district of Samara region the prevailing ontogenetic group in populations of Xanthoria parietina is young generative group, within the city it is mature generative group. Talluses in the same course of ontogenetic development have the least area, and then, the vitality, on the western part of a trunk, and the greatest on the south side. At the same time the vital level of tallus directly depends on the level of environmental pollution. The decrease in the number of talluses is related to indexes of density, illumination, natural tree mortality, cuttings, fires, diseases of tree species.
Information technologies as a way of port activity optimization in conditions of digital economy
Authors: Koroleva Elena , Sokolov Sergey , Makashina Irina , Filatova Evgeniya
Published: December 2019

The use of digital solutions in various fields of activity today allows you to adapt to the digital needs of customers. The adoption of information technology by the subjects of the transport complex was not quick at the beginning, but development has accelerated since then and now they allow optimizing their activities. The article discusses the current regulatory documents in the field of digitalization of seaports. An analysis of cargo turnover by Russian seaports was made, and it was noted that one of the important factors affecting the increase in this indicator is the implementation of digital solutions. Examples of information technologies in the world and in Russia used in the activities of seaports are given.
The model of interaction between the enterprise and the state
Authors: Vlasov Mark , Shekhovtsova Anna , Lelyavina Tatyana
Published: December 2019

The purpose of the article is to determine and formalize the mechanism of interaction between an enterprise and the state. The assessment of not even the effectiveness, but the appropriateness of the functioning of the enterprise is in owner’s hands, who estimates the amount of income that he can count on when building up an enterprise. The government is also interested in the development and functioning of an enterprise, since the enterprise not only generates income in the form of tax deductions from its income, but also provides employment for the population. Therefore, the state seeks to create the necessary conditions for an enterprise. However, this takes into account a plenty of factors that can provide the company with competitive advantages, thereby contributing to an increase in the income of the owner. The state uses the same factors for taxation, since it believes that the owner should share his income for the possession of the benefits that are provided to him. It is from the point of view of the profitability of the enterprise that the owner considers government policies in the field of economics, finance, credit, and taxes. Therefore, there is a need for a formal definition of the mechanism of interaction between the state and the enterprise in terms of the distribution of income from the latter. The article is addressed, first of all, to persons developing a tax system for assessing the consequences of the adoption of certain decisions in this area. In addition, the article may be of interest to owners of enterprises, investors, economists, as well as representatives of commercial banks.
Improvement of quality of housing-and-communal services management
Authors: Mottaeva Angela , Borisova Anzhelika
Published: December 2019

The need of this research is determined by low quality of management at all the levels of the system of housing-and-communal services in Russia, insufficient study of specifics of management of this industry, and also by the need of the development of ways of the increase in management efficiency for the purpose of getting out of the crisis and providing further development. The author revealed some types of services, which are the most significant for consumers; defined their compliances to reference value; technical characteristics of the services quality on the basis of the use of the given model for the organizations rendering housing-and-communal services by the means of sociological poll. The matrix known as “House of Quality” is created for the assessment of the quality of the housing-and-communal services. The matrix and the carried-out analysis allowed the development of some recommendations on the improvement of management quality in the sphere. Results of the research can be used by the regional authorities in the Russian Federation and municipal authorities, when developing standard legal support, programmes of the development of housing, and also when choosing methods of assessing their management efficiency and developing measures to improve management quality.
Allowance for capacity adequacy criterion in optimizing the prospective structure of electric power system
Authors: Belyaev Nikolay , Egorov Andrey , Korovkin Nikolay , Chudny Vladimir
Published: December 2019

This paper considers the optimization procedure of electric power system prospective structure with account made for two criteria: economic value (minimization of specific reduced energy costs for customers) and capacity adequacy (minimization of capacity shortage probability). The proposed procedure is based on genetic algorithm application. The results of procedure evaluation have been considered by the example of optimization of the structure of generating capacities within concentrated power system.
Analysis of reliability of power supply of consumers in non-full-phase modes using adaptive models of their calculation
Authors: Nasirov T.N. , Nepomnyashchiy V.A. , Radionova O.V.
Published: December 2019

Reviewed and analyzed issues related to the reliability of electricity supply in non-full-phase modes of electrical networks, to calculate which use adaptive methods, is built on one Central principle of modeling the modes of electric power systems (EPS). Special attention is paid to the calculation of damages from no full provided of electricity in non-full-phase modes.
The element of digital transformation of regional network – an aggregator
Authors: Byk Felix , Myshkina Lyudmila
Published: December 2019

PJSC “Rosseti” is forced to find new ways of getting additional income. It’s caused by the insufficient financing of network. But a lot of known and supported by network organizations initiatives are leading to the increase of network component in electricity cost for consumers. By the way the new subject, called demand side response aggregator in the UPS, is appeared in power engineering. This problem can be partially solved by the large regional network companies in case of them being an aggregator. At the same time, the efficiency of the aggregator function increases in case of using local power systems as a subject of the retail market as a regulatory resource. It’ll let to avoid the decrease of the power consumption and transmitted power volume, to increase the reliability and the quality of power supply due to reduce of power losses in network. It’s obvious, that the appropriate automation is needed as an element of the digital transformation of the electric network.
Method for assessing the voltage stability limit during emergency outages of the line and generators in the power system
Authors: Rahmanov Nariman , Kurbatsky Viсtor , Guliyev Huseyngulu , Tomin Nikita , Ibrahimov Famil
Published: December 2019

The paper proposes method and algorithm for obtaining the maximum transmitted power limit in the power system under the voltage stability conditions in case of emergency outages of its elements - power lines and generating sets. The method is based on the analysis of the exaggerated states of the system created by increasing the values of the power sources (generators of power plants). The model of system states in extreme modes is described in the form of “extreme transmitted power – generating power values” relationships. The efficiency of the method is investigated on IEEE test schemes and the real Azerenergy system scheme. A comparison of the proposed method results with the evaluation of the critical conditions on the basis of trained neural network is presented.
The support vector machine application in the implementation of multidimensional relay protection
Authors: Kulikov A.L. , Bezdushniy D.I. , Sharygin M.V. , Osokin V.Yu.
Published: December 2019

Power engineering digital transformation, the use of different intelligent electronic devices (IEDs), high-speed communication protocols provide extensive opportunities for relay protection and automation systems modernization of power utilities. One of the most promising avenues of power engineering development is design of new protection devices, whose principles are based on the elements of artificial intelligence and machine learning. The article discusses the features of the application of one of the most common machine learning algorithms, the support vector machine, by the example of constructing a three-dimensional fault detector, which would serve to increase a transmission line stepped protection selectivity. The proposed fault detector has high recognition ability and ease of technical implementation as part of the protection IED.
Self-oscillations at the frequency of subharmonics in nonlinear electric chains and systems
Authors: Ibadullaev M.I. , Tovbaev A.N. , Esenbekov A.Zh.
Published: December 2019

It is known that the occurrence and existence of autoparametric oscillations (AIC) at the subharmonic frequency (GHC) in power lines (power lines) and in power supply systems is extremely undesirable, since they cause ferroresonant overvoltages at different frequencies. At the same time, there is an extensive class of nonlinear electric circuits in which the excitation of the AIC at the frequency of the SGC forms the basis of frequency-converting devices serving as secondary power sources. It is shown that single-phase-three-phase nonlinear systems are, to one degree or another, equivalent circuits of power lines, the main elements of which are: longitudinal compensation capacitors, transverse compensation reactors, and transformers with non-linear characteristics. The regularities of the excitation of the GCC at the frequency (ω / 3) of the power lines were studied, theoretical and experimental studies of the equivalent model of single-phase-three-phase circuits with nonlinear inductance were carried out. For a theoretical analysis of the steady-state mode of SGK at a frequency (ω / 3) with inductive coupling, the frequency- energy approach is used. The conditions of existence and critical parameters of the circuit are determined, and the mechanism of the appearance of the SGC at the frequency (ω / 3) is also studied.
Development of the logical part of the intellectual multi-parameter relay protection
Authors: Loskutov Anton , Pelevin Pavel , Mitrovoc Mile
Published: December 2019

The issues of increasing the sensitivity and reliability of multi-parameter relay protection by sharing more than one information feature (current module, voltage module and phase, active and reactive power) are considered. In this case, the response parameters of individual one-dimensional measuring fault detectors based on the accumulation of statistical data during simulation in the Matlab / Similink software package are determined. A method for combining the signals of one-dimensional measuring fault detectors to increase the sensitivity of protection is proposed. The reliability of the organization of the logical part of multi-parameter relay protection was estimated using the theory of Markov processes, the principles of “2 out of 3” and “1 out of 2”.
Semi-Markov model of a multi-component energy system with component-wise storages
Authors: Obzherin Yuriy E. , Sidorov Stanislav M. , Nikitin Mikhail M.
Published: December 2019

To increase the reliability and efficiency of the functioning of various purposes systems (in particular, energy systems), time redundancy is used. In this paper, a semi-Markov model of a multi- component system with component-wise storage devices, which are the sources of the time reserve, is constructed. The stationary characteristics of reliability and efficiency of the system under consideration are found. The analysis of the influence of storage capacities on the reliability and efficiency of the system is been.
Modeling of a resource-saving method of drawing
Authors: Tsypkina Victoria , Ivanova Veronica
Published: December 2019

In this article examines the possibility of modernization of the drawing of the machine by means of preliminary modeling of resource-saving method of drawing (building information and mathematical models) and the definition of expediency of the further implementation of the physical model of the process equipment.
Generation of electrical energy at gas pipelines using a transported natural gas technological pressure drop
Authors: Buranov M.D. , Mukolyants A.A. , Sotnikova I.V.
Published: December 2019

The article discusses the possibilities of generating electricity without burning fuel by expanding high-pressure natural gas at gas distribution stations with lower specific capital costs. It is proposed to reduce the pressure of the transported natural gas using expander-generator units instead of traditional throttle devices.
A cardiac and subcutaneous canine dirofilariosis outbreak in a kennel in central France
Authors: Laidoudi Younes , Ringot David , Watier-Grillot Stéphanie , Davoust Bernard , Mediannikov Oleg
Published: December 2019

Canine dirofilarioses are nematode infections caused by two species of the genus Dirofilaria: D. immitis and D. repens. We describe here an outbreak of D. immitis and D. repens infection in military working dogs (MWDs) housed in a kennel in the Indre department (centre of France). Out of a total of 17 dogs, 6 (35.2%) tested positive for D. immitis, D. repens or both parasites. Infested dogs were treated and prophylactic measures were implemented for the entire kennel staff. To our knowledge, this is the first documented description of an outbreak of canine cardiopulmonary dirofilariasis in the center of France, unlike in the south of this country, where D. immitis and D. repens dirofilariasis are enzootic. In France, as mosquito vectors expand their territory and new non-native vectors are introduced, it is likely that the distribution area of these two diseases of domestic and wild carnivores will be wider and underestimated.
Investigation of the eddy current effect on the high frequency response of the Mirnov probe on J-TEXT
Authors: Shen Chengshuo , Cai Zhenming , Ren Tian , Zhang Xitong , Hu Qiming , Wang Nengchao , Huang Zhuo , Zhou Song , Li Jianchao , Li Mao , Li Da , Han Dongliang , Ding Yonghua
Published: December 2019

This paper investigates the high frequency response of the Mirnov probe based on a test platform, which is capable of generating a uniform AC magnetic field within the frequency range of 1–300 kHz. The eddy current effect is quantitatively reflected by the phase shift ϕc and normalized amplitude δ of the measured magnetic field between cases with and without a conducting plate located near the Mirnov probe. This method compensates the resonant effect in the Mirnov probe circuit and hence reflects purely the eddy current effect. The eddy current effect increases with the decrease in the distance between the probe and the conducting plate. With the increase in frequency, the magnitude of δ decreases to a saturated value at 10 kHz but increases significantly above 100 kHz for 304-stainless steel, while the eddy current effect with graphite appears at around 10 kHz and the magnitude of δ decreases to the minimum at 125 kHz, followed by a significant increase above 125 kHz. With the increase in f, the magnitude of ϕc increased until 2.5 kHz and 40 kHz for steel and graphite, respectively, then decreased with a further increase in f. The phasor expression is introduced to describe the AC magnetic field and allows an easy expression of the eddy current field. The phase of the eddy current field decreases toward −180° with f. The amplitude of the eddy current field increases with f and reaches its maximum when the skin depth reduces to a critical value. The eddy current field decreases with a further increase in the frequency.
Numerical analysis of the spin dynamics in bilayer nanodots with interlayer antiferromagnetic coupling
Authors: Ya X. , Fukuzono M. , Tanaka T. , Matsuyama K.
Published: December 2019

Synthetic antiferromagnetic nanodots with perpendicular magnetic anisotropy are promising candidates for improving the performance of magnetic random-access memory or spin torque nano-oscillators; however, the mechanism for the interlayer antiferromagnetic coupling is still not completely understood. Therefore, we numerically investigated the ferromagnetic resonance characteristics of perpendicularly magnetized bilayer nanodots with interlayer antiferromagnetic coupling. The results show that the resonance frequency strongly depends on the interlayer antiferromagnetic coupling intensity and the individual layer thickness. It was found that external fields induce opposite resonance peak shifts, reflecting the contradicting Zeeman energy effect on individual layers with opposite magnetization directions. The resonance properties were successfully reconfigured by adjusting the uniaxial anisotropy and coupling intensity. Moreover, bistable (parallel and antiparallel) magnetization states were controlled by applying an external field sweep. The difference between the resonance frequencies of two bistable states was enhanced by decreasing the layer thickness and increasing the antiferromagnetic coupling intensity. Our numerical results demonstrate the potential ability of currently available strong interlayer exchange coupling for further increasing of high resonance frequencies in the synthetic antiferromagnet system with perpendicular anisotropy.
Band engineering via grain boundary defect states for large scale tuning of photoconductivity in Bi1−xCaxFe1−yTiyO3−δ
Authors: Nandy Subhajit , Mocherla Pavana S. V. , Kaur Kulwinder , Gautam Sanjeev , Nanda B. R. K. , Sudakar C.
Published: December 2019

Spark plasma sintered Bi1−xCaxFe1−yTiyO3−δ (BCFTO) (x = y = 0.05 and 0.1) nanoparticle ceramics are studied for photoconductivity properties. As-prepared (AP) BCFTO hosts a large concentration of grain boundary (GB) oxygen vacancies (OV), whereas air annealed (AA) BCFTO have significantly suppressed GB OV. X-ray absorption near edge spectroscopy study confirms that Fe and Ti remain in 3+ and 4+ oxidation states, respectively. Thus, lattice OV created when only Ca2+ is substituted in BiFeO3 are charge compensated in Ca and Ti codoped BiFeO3. This ascertains that BCFTO is devoid of lattice OV. Photoconductivity studies show four orders of more photocurrent arising from GB OV contributions in BCFTO-AP compared to that in BCFTO-AA samples. A large increase in the activation energy for the AA samples (0.4 eV to 1.6 eV) compared to that for the AP samples (0.06 eV to 0.5 eV) is obtained from ln ω vs 1/T Arrhenius plots. This further substantiates the suppression of GB OV resulting in poor photoconductivity. Diffuse band edges observed in Kubelka-Munk plots of BCFTO-AP samples are a consequence of OV defect states occupying the bulk bandgap. In the absence of OV defect states, band edge becomes sharper. Density functional theory (DFT) calculations further support the experimental observations. DFT study shows that the presence of Ca and Ti does not enhance the photocurrent as these codopants do not produce mid-bandgap states. The mid-bandgap defect states are attributed only to the unsaturated bonds and OV at the GB in BCFTO. These studies manifest a critical role of OV residing at the GB in tuning the photoconductivity and, hence, the photoresponse of BCFTO.
Cluster synchronization: From single-layer to multi-layer networks
Authors: Ma Cun , Yang Qirui , Wu Xiaoqun , Lu Jun-an
Published: December 2019

Cluster synchronization is a very common phenomenon occurring in single-layer complex networks, and it can also be observed in many multilayer networks in real life. In this paper, we study cluster synchronization of an isolated network and then focus on that of the network when it is influenced by an external network. We mainly explore how the influence layer impacts the cluster synchronization of the interest layer in a multilayer network. Considering that the clusters are changeable, we introduce a term called “cluster synchronizability” to measure the ability of a network to reach cluster synchronization. Since cluster synchronizability is intimately associated with the structure of the coupled external layer, we consider community networks and networks with different densities as the coupled layer. Besides the topology structure, the connection between two layers may also have an influence on the cluster synchronization of the interest layer. We study three different patterns of connection, including typical positive correlation, negative correlation, and random correlation and find that they all have a certain influence. However, the general theoretical analysis of cluster synchronization on multilayer networks is still a challenging topic. In this paper, we mainly use numerical simulations to discuss cluster synchronization.
Multistability in lossy power grids and oscillator networks
Authors: Balestra Chiara , Kaiser Franz , Manik Debsankha , Witthaut Dirk
Published: December 2019

Networks of phase oscillators are studied in various contexts, in particular, in the modeling of the electric power grid. A functional grid corresponds to a stable steady state such that any bifurcation can have catastrophic consequences up to a blackout. Also, the existence of multiple steady states is undesirable as it can lead to transitions or circulatory flows. Despite the high practical importance there is still no general theory of the existence and uniqueness of steady states in such systems. Analytic results are mostly limited to grids without Ohmic losses. In this article, we introduce a method to systematically construct the solutions of the real power load-flow equations in the presence of Ohmic losses and explicitly compute them for tree and ring networks. We investigate different mechanisms leading to multistability and discuss the impact of Ohmic losses on the existence of solutions.
The effect of energetic electrons on the collisionless fusion plasma sheath in ion cyclotron range of frequencies heating
Authors: Ou Jing , An Xin , Men Zongzheng
Published: December 2019

A one-dimensional model, consisting of a hydrodynamic radio-frequency (RF) sheath model for the ion cyclotron range of frequencies heating and an equivalent circuit model, is used to study the structure of the collisionless RF sheath of a fusion plasma containing a beam of energetic electrons. For various energetic electron concentrations and velocities at the plasma-sheath edge, a set of equations describing the model are solved numerically to obtain the potential drop across the RF sheath and the sheath thickness, as well as the spatiotemporal variations of the potential, the ion density, and the background electron and energetic electron densities inside the sheath. Under the current EAST ion cyclotron range of heating conditions, it is observed that even at small beam fluxes, the potential drop across the sheath is enhanced at any time in an RF cycle for different bulk plasma densities, ion temperatures, and frequencies and amplitudes of the disturbance current. When the energetic electron component is included, the physical sputtering yields of the RF sheath wall materials such as titanium and iron become significant as a result of the enhancement of the drop in the sheath potential.
Sensing the turbulent large-scale motions with their wall signature
Authors: Güemes A. , Discetti S. , Ianiro A.
Published: December 2019

This study assesses the capability of extended proper orthogonal decomposition (EPOD) and convolutional neural networks (CNNs) to reconstruct large-scale and very-large-scale motions (LSMs and VLSMs respectively) employing wall-shear-stress measurements in wall-bounded turbulent flows. Both techniques are used to reconstruct the instantaneous LSM evolution in the flow field as a combination of proper orthogonal decomposition (POD) modes, employing a limited set of instantaneous wall-shear-stress measurements. Due to the dominance of nonlinear effects, only CNNs provide satisfying results. Being able to account for nonlinearities in the flow, CNNs are shown to perform significantly better than EPOD in terms of both instantaneous flow-field estimation and turbulent-statistics reconstruction. CNNs are able to provide a more effective reconstruction performance employing more POD modes at larger distances from the wall and employing lower wall-measurement resolutions. Furthermore, the capability of tackling nonlinear features of CNNs results in estimation capabilities that are weakly dependent on the distance from the wall.
Phase diagrams of honeycomb and square nanocrystal superlattices from the nanocrystal’s surface chemistry at the dispersion-air interface
Authors: Soligno Giuseppe , Vanmaekelbergh Daniel
Published: December 2019

In this work, we theoretically investigate the conditions favoring the interfacial self-assembly of PbSe nanocrystals (NCs) resulting in silicene-honeycomb superstructures. Using a coarse-grained molecular dynamics model, we study the NCs’ self-assembly at the dispersion-air interface with respect to the input parameters regulating the various forces experienced by the NCs at the interface. From these results, we extrapolate detailed assembled-phase diagrams showing which ranges of the input parameters promote the formation of silicene-honeycomb superstructures and which regimes result in square geometries. Then, we use a sharp-interface numerical model to compute the energy landscape experienced by each NC at the dispersion-air interface with respect to the NC’s surface chemistry. From such an energy landscape, we fit the parameters regulating the interface-adsorption forces experienced by the NCs at the interface. Combining these findings with the results presented in our assembled-phase diagrams, we find out which surface-chemistry properties of the NCs better promote the interfacial self-assembly in silicene-honeycomb superstructures, and we speculate on some experimental strategies to reach an improved control on the synthesis of PbSe silicene-honeycomb superstructures.
Low energy band gap state in compressed needlelike structure of CdSb:Ni
Authors: Arslanov T. R. , Dzhamamedov R. G. , Zakhvalinskii V. S. , Kochura A. V. , Rodionov V. V. , Ahuja R.
Published: December 2019

We studied the effect of high pressure on the border of intrinsic conductivity in CdSb doped with 0.5%Ni, the structure of which is needlelike due to spherical extended NiSb inclusions. The bandgap state has been found to be strongly governed by a structural transition in the composite structure. A pressure-induced phase exhibits an activation behavior only upon heating with a very low energy gap by 0.05 eV at 5.32 GPa, while metallic conductivity appears upon subsequent cooling, which is attributed to the instability of the cadmium antimonide structure. Room-temperature Hall effect measurements confirm that the high-pressure phase is not fully metallized, yielding a hole concentration of 4.08 × 1018 cm−3 at the onset of structural transition and a reduced magnitude by order in this phase.
Ultrafast sensing of photoconductivity decay using microwave resonators
Authors: Gyüre-Garami B. , Blum B. , Sági O. , Bojtor A. , Kollarics S. , Csősz G. , Márkus B. G. , Volk J. , Simon F.
Published: December 2019

Microwave reflectance probed photoconductivity (or μ-PCD) measurement represents a contactless method to determine the amount and lifetime of light-induced charge carriers in semiconductors. Major drawbacks of the method include a difficult separation of reflectance due to dielectric and conduction effects and that the μ-PCD signal is prohibitively weak for highly conducting samples. Both of these limitations could be tackled with the use of microwave resonators due to the well-known sensitivity of resonator parameters to minute changes in the material properties combined with a null measurement. A general misconception is that time resolution of resonator measurements is limited beyond their bandwidth by the readout electronics response time. While it is true for conventional resonator measurements, such as those employing a frequency sweep, we present a time-resolved resonator parameter readout method which overcomes these limitations and allows measurement of complex material parameters and to enhance μ-PCD signals with the ultimate time resolution limit being the resonator time constant. This is achieved by detecting the transient response of microwave resonators on the time scale of a few 100 ns during the μ-PCD decay signal. The method employs a high-stability oscillator working with a fixed frequency, which results in a stable and highly accurate measurement.
Influence of Coulomb interaction effect on the electrical transport for few-layered PtSe2 films
Authors: Zhang Yu-jie , Wang Wen-Jie , Zhou Ding-bang , Xu Jian-Ping , Wang Gong-tang , Li Lan
Published: December 2019

The Coulomb effect is a particularly significant topic in quasi-two-dimensional systems. Here, we carried out comprehensive measurements of electrical transport properties of fewer-layer PtSe2 films with and without antidot arrays. For as-grown PtSe2 films, the sheet conductance σ□ varies linearly with the logarithm of temperature at low temperature, which can be well described by the Altshuler and Aronov electron-electron interaction (EEI) effect, and then the result was further quantitatively confirmed by the ratios of a relative change of the Hall coefficient ΔRH/RH to that of sheet resistance ΔR□/R□. While after milling of antidot arrays the PtSe2 film possesses inhomogeneous structure, it still presents metallic transport behavior. The overall σ□ and RH characteristics can be explained by the current EEI theories in granular metals. Our results not only reveal the fundamental physics of PtSe2 films, but also provide powerful experimental evidence for the presence of the Coulomb EEI effect in the family of transition metal dichalcogenides. This work presents the subtle change of charge transport properties by introducing antidot arrays, which may be of benefit in improving sensitivity and stability of nanoscale electronic devices.
History hydrodynamic torque transitions in oscillatory spinning of stick-slip Janus particles
Authors: Premlata A. R. , Wei Hsien-Hung
Published: December 2019

We theoretically investigate the oscillatory spinning of an axisymmetric stick-slip Janus particle (SSJP) under the creeping flow condition. Solving the unsteady Stokes equation together with a matched asymptotic boundary layer theory, we find that such a particle can display unusual viscous torque responses in the high frequency regime depending on the Stokes boundary layer thickness δ, the slip length λ of the slip face, and the coverage of the stick face. Our analysis reveals that an SSJP will always experience a reduced Basset torque of 1/δ decay due to the presence of the slip face, with amplitude smaller than the no-slip counterpart irrespective of the value of λ. If the coverage of the stick face is sufficiently small, the reduced Basset torque can turn into a constant torque plateau due to prevailing slip effects at larger values of δ, representing a new history torque transition prior to the slip-stick transition at δ ∼ λ. All these features are markedly different from those for no-slip and uniform slip particles, providing not only distinctive fingerprints for Janus particles but also a new means for manipulating these particles.
Assessing methods for restoring seagrass (Zostera muelleri) in Australia’s subtropical waters
Authors: Wendländer Nele Svenja , Lange Troels , Connolly Rod M. , Kristensen Erik , Pearson Ryan M. , Valdemarsen Thomas , Flindt Mogens R.
Published: December 2019

Zostera muelleri, the dominant seagrass species along the eastern coastline of Australia, has declined due to anthropogenic stressors, including reduced water clarity. Water quality has improved in recent years, but restoration efforts are hampered by limited knowledge of transplantation methods. To support future restoration efforts, we tested multiple techniques for transplanting mature seagrass shoots: (1) sediment cores with intact seagrass plants (plug); (2) individual shoots anchored on frames (frame); (3) frame methods combined with subsurface mats to exclude bioturbating animals (mat+frame); (4) above-ground cages to exclude grazing fish (cage+frame); and (5) combined treatment of above-ground cages and subsurface mats (cage+mat+frame). Transplant success over 10 months showed considerable variability among locations. At one site, seagrass persisted in all treatments, with highest growth in the mat+frame treatment. At two locations, uncaged shoots were lost within 6–35 days of transplanting, presumably due to grazing by fish. In treatments with cages, growth was again highest in the mat+frame treatment. At the fourth location, all seagrass was lost due to physical stress. Thus, we conclude that transplantation success is highest using the mat+frame technique, but overall success depends on careful assessment of biotic and abiotic stressors at the chosen locations.
Insights into channel modulation mechanism of RYR1 mutants using Ca2+ imaging and molecular dynamics
Authors: Yamazawa Toshiko , Ogawa Haruo , Murayama Takashi , Yamaguchi Maki , Oyamada Hideto , Suzuki Junji , Kurebayashi Nagomi , Kanemaru Kazunori , Oguchi Katsuji , Sakurai Takashi , Iino Masamitsu
Published: December 2019

Type 1 ryanodine receptor (RYR1) is a Ca2+ release channel in the sarcoplasmic reticulum in skeletal muscle and plays an important role in excitation–contraction coupling. Mutations in the RYR1 gene cause severe muscle diseases such as malignant hyperthermia (MH), which is a disorder of CICR via RYR1. Thus far, >300 mutations in RYR1 have been reported in patients with MH. However, owing to a lack of comprehensive analysis of the structure–function relationship of mutant RYR1, the mechanism remains largely unknown. Here, we combined functional studies and molecular dynamics (MD) simulations of RYR1 bearing disease-associated mutations at the N-terminal region. When expressed in HEK293 cells, the mutant RYR1 caused abnormalities in Ca2+ homeostasis. MD simulations of WT and mutant RYR1s were performed using crystal structure of the N-terminal domain (NTD) monomer, consisting of A, B, and C domains. We found that the mutations located around the interdomain region differentially affected hydrogen bonds/salt bridges. Particularly, mutations at R402, which increase the open probability of the channel, cause clockwise rotation of BC domains with respect to the A domain by alteration of the interdomain interactions. Similar results were also obtained with artificial mutations that mimic alteration of the interactions. Our results reveal the importance of interdomain interactions within the NTD in the regulation of the RYR1 channel and provide insights into the mechanism of MH caused by the mutations at the NTD.
Rydberg excitons in electric and magnetic fields obtained with the complex-coordinate-rotation method
Authors: Zielinski Patrik , Rommel Patric , Schweiner Frank , Main Jörg
Published: December 2019

The complete theoretical description of experimentally observed magnetoexcitons in cuprous oxide has been achieved by Schweiner et al (2017 Phys. Rev. B 95 035202), using a complete basis set and taking into account the valence band structure and the cubic symmetry of the solid. Here, we extend these calculations by investigating numerically the autoionising resonances of cuprous oxide in electric fields and in parallel electric and magnetic fields oriented in [001] direction. To this aim we apply the complex-coordinate-rotation method. Complex resonance energies are computed by solving a non-Hermitian generalised eigenvalue problem, and absorption spectra are simulated by using relative oscillator strengths. The method allows us to investigate the influence of different electric and magnetic field strengths on the position, the lifetime, and the shape of resonances.
Achieving extremely high optical contrast of atomically-thin MoS2
Authors: Donnelly Gavin E , Velický Matěj , Hendren William R , Bowman Robert M , Huang Fumin
Published: December 2019

Extraordinarily high optical contrast is instrumental to research and applications of two-dimensional materials, such as, for rapid identification of thickness, characterisation of optical properties, and quality assessment. With optimal designs of substrate structures and light illumination conditions, unprecedented optical contrast of MoS2 on Au surfaces exceeding 430% for monolayer and over 2600% for bilayer is achieved. This is realised on custom-designed substrates of near-zero reflectance near the normal incidence. In particular, by using an aperture stop to restrict the angle of incidence, high-magnification objectives can be made to achieve extraordinarily high optical contrast in a similar way as the low-magnification objectives, but still retaining the high spatial resolution capability. The technique will allow small flakes of micrometre size to be located easily and identified with great accuracy, which will have significant implications in many applications.
Composition effect on elastic properties of model NiCo-based superalloys*
Authors: Li Weijie , Wang Chongyu
Published: December 2019

NiCo-based superalloys exhibit higher strength and creep resistance over conventional superalloys. Compositional effects on elastic properties of the γ and γ′ phases in newly-developed NiCo-based superalloys were investigated by first-principles calculation combined with special quasi-random structures. The lattice constant, bulk modulus, and elastic constants vary linearly with the Co concentration in the NiCo solution. In the selected (Ni, Co)3(Al, W) and (Ni, Co)3(Al, Ti) model γ′ phase, the lattice constant, and bulk modulus show a linear trend with alloying element concentrations. The addition of Co, Ti, and W can regulate lattice mismatch and increase the bulk modulus, simultaneously. W-addition shows excellent performance in strengthening the elastic properties in the γ′ phase. Systems become unstable with higher W and Ni contents, e.g., (Ni0.75Co0.25)3(Al0.25 W0.75), and become brittle with higher W and Co addition, e.g., Co3(Al0.25 W0.75). Furthermore, Co, Ti, and W can increase the elastic constants on the whole, and such high elastic constants always correspond to a high elastic modulus. The anisotropy index always corresponds to the nature of Young’s modulus in a specific direction.
Risk assestment of housing reconstruction project community-based construction after the earthquake
Authors: Boy Wendi , Imani Rafki , Chari Mayozi , Purba Widiawati , Melasari Jihan
Published: December 2019

Earthquake events caused thousands of families to be displaced, some inside refugee camps, others living in relatives’ houses, besides causing the stages of government, economy and Social Stage to experience many obstacles. Reconstruction implementation Community-based housing is the backbone for sustainable development. Through this approach, it is hoped that people can realize the importance of building a building using earthquake resistant building structures. Based Deskriftive analysis and factor analysis, there are 18 (eighteen) the risk of pre-construction project of housing reconstruction after the earthquake based society including the risk of unexpected (Undesirable). From 8 (eight) Stages of pre-construction phase of the housing reconstruction is 1 (One) Stages of risks are still acceptable namely Stages 6 (Stages of Establishment of Community Organizations). The greatest risk is in Stage 8 is R.8.16. The price of Building Materials which has the biggest risk value is: 5.389. With this risk analysis it is hoped that the parties concerned can pay more attention to the risks that have high value (categorized as an unexpected risk)”.
Decision Support System in Determining Structural Position Mutations Using Simple Additive Weighting (SAW) Method
Authors: Fitrul Hadi Aulia , Permana Randy , Syafwan Havid
Published: December 2019

Mutations are needed in a company to improve the quality of workers. mutations are based on the capabilities of individual workers in the company. HRD assesses the abilities of workers from various aspects. manually the accuracy of mutations based on the value of the criteria is only 38%. with a low value of accuracy resulting in mutations of workers not as expected. the criteria given are FFB Production (C1), Core CPO Production (C2) and Field Care (C3). Range of mutation decision weights are 10-30% Giving First Warning Letter, 31 - 70% Position setting and 71 - 100% Giving promotion. with the SAW method the analysis is done by computerization. after testing the criteria obtained. HRD assesses that the accuracy of workers reaches 85%. and better and in accordance with what the company wants.
Exploring Topic Difficulty in Information Retrieval Systems Evaluation
Authors: Ting Pang Wei , Rajagopal Prabha , Wang Mengjia , Zhang Shuxiang , Devi Ravana Sri
Published: December 2019

Experimental or relevance assessment cost as well as reliability of an information retrieval (IR) evaluation is highly correlated to the number of topics used. The need of many assessors to produce equivalent large relevance judgments often incurs high cost and time. So, large number of topics in retrieval experiment is not practical and economical. This experiment proposes an approach to identify most effective topics in evaluating IR systems with regards to topic difficulty. The proposed approach is capable of identifying which topics and topic set size are reliable when evaluating system effectiveness. Easy topics appeared to be most suitable for effectively evaluating IR systems.
Application of AHP Analysis to Increase Employee Career Paths in Decision Support Systems
Authors: Santony Julius , Amir Faisal , Sumijan  , Novita Rice
Published: December 2019

Employee career paths are one way for companies to improve employee performance in educating their students. The problem of manager in decision making uses the selection of methods and assessment processes subjectively so that the process is not in accordance with the goals of the career path. Therefore, an Analytical Hierarchy Process (AHP) method is needed to help make decisions. In this study, using the criteria of Planning, Teaching, Evaluating and Learning. Ranking results obtained that Learning criteria are very important criteria with calculation results of 0.602 when compared to the other three criteria. The Decision Support System (DSS) application provides the final results obtained from testing the calculation that the alternative Employee C is the best employee with a calculation of 0.227 compared to the other alternatives. The DSS application using the AHP method has a data accuracy rate of 86.67% and can be used as a support for manager decisions to make recommendations for increasing employee career paths.
Online Management System of UPI FKIP YPTK Padang Education Field Practice
Authors: Indah Juwita Astri , Ikhlas Muhammad
Published: December 2019

This study aims to develop the management system of PLK in the form of online system based on FKIP UPI YPTK Padang website that is valid, practical and effective. This is because there is no special system to accommodate PLK implementation process as PLK’s online management system. The type of research that the authors use is Research and Development research better known as R & D. System test conducted on students at FKIP Prodi PTI UPI YPTK Padang. The test subjects consisted of the validity aspect of the system performed on 3 validators (expert), and the media practicality aspect that was done on 1 practitioner and 35 students who did the PLK. Instruments used in collecting data in the form of questionnaires of validity and practicality, and effectiveness. The data analysis techniques use Aiken’s V formula to find validity and calculate practicality percentages for practicality and use factor analysis techniques to search for the effectiveness of a website-based online management system. Based on the research that has been done, then obtained online management system based website PLK is www.fkipupiyptk.com, with validity value 0.80 Valid stated. While the average practicable result practiced by practitioners is 97.00% and is categorized as very practical, and the practical average by PLK students is 86.11% with very practical category. Effectiveness seen from the paired sample test t test, obtained a significance value of 0, 000 (0, 000 <0, 05) means that there are significant differences in students who use manual systems with students who use the online system, thus the PLK online management system website is effective to use compared to the system manual.
Determination of the Shortest Route Towards the Tourist Destination Area Using the Ant Algorithma
Authors: Wiwik Sri Rahayu Ginantra Ni Luh , Taufiqurrahman T , Widi Bhawika Gita , Bagus Ary Indra Iswara Ida , Wanto Anjar
Published: December 2019

There are so many tourism objects in the world, especially in Indonesia. One of the most famous tourist attractions in Indonesia including Bali, Borobudur, Lake Toba, and many others. The tourist attraction is not only famous in Indonesia but also famous to foreign countries, because one of them is a relic of the wonders of the world. In addition, these tourist attractions also have natural beauty and uniqueness, which is different from other countries, so that it attracts local tourists and foreign tourists to visit the place. However, there are several routes to get to these tourist attractions, so that local tourists and foreign tourists who want to visit have a little trouble having to go through which route to get to their destination. Surely they want the closest travel route. Therefore the purpose of this study is to use the ant algorithm to determine the shortest route to the tourist area. The ant algorithm is adopted based on the behavior and habits of the ant colony. In general, ant colonies can find and find the fastest and shortest route or route to food sources from their nests, based on footprints on traversed trails. This study uses 5 cities for example, including C1, C2, C3, C4 and C5, with the starting point of C1 and C5 destination point. Based on calculations using the ant algorithm to determine the shortest route, the shortest and fastest route obtained by ant 4 is route C1 → C4 → C5 with a distance of 140 KM.