bluuebunny/crossref_metadata_2025 huggingface dataset:
Asteroseismology of evolved stars to constrain the internal transport of angular momentum
Authors: den Hartogh J. W. , Eggenberger P. , Deheuvels S.
Published: February 2020

Context. The internal characteristics of stars, such as their core rotation rates, are obtained via asteroseismic observations. A comparison of core rotation rates found in this way with core rotation rates as predicted by stellar evolution models demonstrate a large discrepancy. This means that there must be a process of angular momentum transport missing in the current theory of stellar evolution. A new formalism was recently proposed to fill in for this missing process, which has the Tayler instability as its starting point (by Fuller et al. 2019, MNRAS, 485, 3661, hereafter referred to as “Fuller-formalism”).

Aims. We investigate the effect of the Fuller-formalism on the internal rotation of stellar models with an initial mass of 2.5 M⊙.

Methods. Stellar evolution models, including the Fuller-formalism, of intermediate-mass stars were calculated to make a comparison between asteroseismically obtained core rotation rates in the core He burning phase and in the white dwarf phase.

Results. Our main results show that models including the Fuller-formalism can match the core rotation rates obtained for the core He burning phases. However, these models are unable to match the rotation rates obtained for white dwarfs. When we exclude the Fuller-formalism at the end of the core He burning phase, the white dwarf rotation rates of the models match the observed rates.

Conclusions. We conclude that in the present form, the Fuller-formalism cannot be the sole solution for the missing process of angular momentum transport in intermediate-mass stars.
Bleiben Sie gesund!
Authors: Teppe Lena
Published: February 2020

Lärm und Zugluft, Überstunden und Schichtarbeit, schweres Tragen und langes Stehen – die Arbeit im OP ist geprägt von steigenden Belastungen und erhöhten Anforderungen, die sich negativ auf die Gesundheit auswirken können. Wie Sie Stressfaktoren reduzieren und Ihre persönlichen Ressourcen stärken, erläutert unsere Autorin.
Personalbedarf im OP – Methoden und Implikationen
Authors: Krohn Markus , Fleßa Steffen
Published: February 2020

Wie viele OP-Pflegende benötigt eine Klinik – und wie viele kann sie sich leisten? Schritt für Schritt erklären unsere Autoren verschiedene Methoden, mit denen der Personalbedarf im OP geplant werden kann. Denn nur, wenn genügend Mitarbeiter vorhanden sind, können Arbeitsbelastungen und Stressfaktoren reduziert werden.
Prävention der diabetischen Ketoazidose
Authors: Holder Martin , Ehehalt Stefan
Published: February 2020

Zur Vorbeugung einer schweren, lebensbedrohlichen Stoffwechselentgleisung (diabetische Ketoazidose, DKA) bei Manifestation eines Typ-1-Diabetes bei Kindern und Jugendlichen stehen nach unserem Kenntnisstand derzeit die folgenden Präventionsmaßnahmen zur Verfügung: (1) Aufklärungskampagnen: Durch Aufklärungskampagnen über die diabetes-typischen Symptome ist eine signifikante Reduktion der DKA-Häufigkeit bei Diabesmanifestation möglich. Dies wird in Übereinstimmung mit mehreren Studien auch von der Stuttgarter Ketoazidose-Präventionskampagne gezeigt. (2) Autoantikörper-Screening: Das frühe Wissen über ein erhöhtes Krankheitsrisiko bereits vor Auftreten der klinischen Symptome kann bei entsprechender Aufklärung und Schulung die DKA-Häufigkeit ebenfalls deutlich senken. Darüber hinaus besteht für diese Kinder die Möglichkeit, an Interventionsstudien teilzunehmen, wie zum Beispiel an der Fr1da-Insulin-Interventionsstudie. (3) Als weitere Präventionsmaßnahmen kommen beispielsweise Impfungen gegen Coxsackie-B- und Rotaviren in Betracht.
First Clinical Experience with Anti-myelin Oligodendrocyte Glycoprotein Antibody-Positive Optic Neuritis
Authors: Heckmann Jan , Todorova Margarita , Müller Stefanie , Broser Philip Julian , Sturm Veit
Published: February 2020

Background Antibodies against myelin oligodendrocyte glycoprotein (MOG-IgG) have been consistently found in a range of demyelinating disorders. In this context, MOG-IgG-associated optic neuritis (ON) has been suggested as a new subset of optic neuropathy. However, clinical manifestations and distinctive characteristics have only rarely been described.

Patients and Methods A retrospective case series of three patients with MOG-IgG-associated ON. Clinical morphological features using imaging techniques are presented.

Results Three patients (8-year-old boy, 28-year-old female, 48-year-old male) were included. An 8-year-old boy suffered from a bilateral ON with severe visual loss. The best-corrected visual acuity (BCVA) was 0.05 in the right eye and finger counting in the left eye. The patient had a previous episode of acute disseminated encephalomyelitis (ADEM) with a right abducens nerve palsy. Visual acuity recovered after repeated cycles of intravenous methylprednisolone pulse therapy and 10 cycles of plasma exchange. During the last follow-up, BCVA was 0.9 in the right eye and 0.8 in the left eye. A 28-year-old female presented with a bilateral ON. Her BCVA was 0.5 in the right eye and 0.8 in the left eye. She fully recovered with pulse methylprednisolone therapy (1000 mg/d) with tapering after the second cycle and had a BCVA of 1.0 during the last follow-up visit. A 48-year-old male suffered from a relapsing bilateral ON. At first presentation, BCVA was 0.1 in the right eye and finger counting in the left eye. BCVA fully recovered after each pulse therapy with intravenous methylprednisolone (two cycles). Since the first relapse, the patient has been receiving long-term immunosuppression with rituximab. Despite rituximab and low-dose oral prednisone, the patient had another relapse with a left ON. After a third cycle with intravenous methylprednisolone, he partially recovered. BCVA at last follow-up was 1.0 in the right and 0.8 in the left eye.

Conclusions MOG-IgG antibodies have been identified in different acquired demyelinating syndromes. The patients reported had an ADEM followed by bilateral ON, an isolated bilateral ON, and a relapsing bilateral ON. Individual treatment strategies led to substantial visual recovery in all patients. We recommend inclusion of MOG-IgG antibodies in the diagnostic workup at least after the first recurrence of ON since they can serve as a diagnostic and potential prognostic tool and might lead to specific therapeutic recommendations.
Practical Preparation of Cyclopropenone 1,3-Propanediol Ketal
Authors: Mulks Florian F. , Heckershoff Robin , Zimmer Marc , Hashmi A. Stephen K.
Published: February 2020

Cyclopropenone 1,3-propanediol ketal is an increasingly versatile building block for the introduction of various C3 and dioxaspiro units due to the emergence of numerous methodologies for the application of strained hydrocarbons. This Practical Synthetic Procedure gives an updated synthesis for a basic ketal of cyclopropenone with lowered solvent toxicity and a detailed step-by-step guide for the safe production of potassium amide in liquid ammonia and for its application in the synthesis of the cyclopropene ring.
Insight into the topological phase and elastic properties of halide perovskites CsSnX3 (X = l, Br, Cl) under hydrostatic pressures
Authors: Yalameha Shahram , Saeidi Parviz , Nourbakhsh Zahra , Vaez Aminollah , Ramazani Ali
Published: February 2020

Topological materials are considered as a novel quantum state of matter, which can be characterized by symmetry-protected Dirac interfacial states, and exhibit an exotic phenomenon when combined with the other phases. The topological phase in the perovskite structures is important since it can provide various heterostructure interfaces with multifunctional properties. Alpha-(α-) phase cesium-based halide perovskites CsSnX3 (X = I, Br, Cl) can be considered as a promising candidate for topological semiconductors under hydrostatic pressures. The narrow bandgap of these compounds (≤1.83 eV) has made them interesting materials for the electronic, optoelectronic, and photovoltaic applications. In the current research, we systematically carry out first-principles density functional theory (DFT) to study the effects of hydrostatic pressure on the electronic structure of CsSnX3 (X = I, Br, Cl) compounds. The topological phase of these compositions is investigated using the Fu–Kane and Wilson loop methods in order to identify the Z2 topological invariants for each structure. The topological surface states (TSSs) of the (001) plane of these compounds are investigated using the semi-infinite Green's function. These TSSs guarantee the nontrivial nature of CsSnX3 compounds under pressure. With respect to the engineering applications, three important mechanical properties of these compounds including elastic anisotropy, ductility, and hardness are also investigated.
Observation of photoassociation spectroscopy of ultralong 37D5/2 + 6S1/2 Cs2 Rydberg molecules
Authors: Bai Suying , Han Xiaoxuan , Bai Jingxu , Jiao Yuechun , Wang Huihui , Zhao Jianming , Jia Suotang
Published: February 2020

We present an experimental observation of 37D5/2 + 6S1/2 Cs2 Rydberg-ground molecules by employing a two-photon photoassociation method. Two distinct Rydberg-ground molecular signals, deep and shallow bound molecules, are observed at the red detuning of atomic line. In theory, the model of scattering interaction between the Rydberg electron and ground-state atom is used to simulate the experiments. Two potential energy curves with energy minimum, deep pure triplet 3Σ and shallow hyperfine-mixed singlet–triplet 1,3Σ potentials, refer to the attained Rydberg-ground molecular signals, respectively. Calculations of the binding energy of triplet 3Σ and mixed 1,3Σv = 0 states are compared with the measurements. The agreement between the calculated and measured values of the binding energy yields zero-energy scattering lengths asT(0) = −19.2a0 and asS(0) = −1.3a0, respectively.
A comprehensive theoretical picture of E centers in silicon: From optical properties to vacancy-mediated dopant diffusion
Authors: Herrero-Saboya G. , Martin-Samos L. , Jay A. , Hemeryck A. , Richard N.
Published: February 2020

Among the common vacancy-related point defects in silicon, the E center is one of the most prominent due to its degrading effect in silicon-based technology. Even though it has been the subject of extensive experimental and theoretical studies, a comprehensive theoretical model capable of reproducing the experimental evidence for all three dopants (P, As, and Sb) is still missing. Guided by a Jahn-Teller model, we are able to reproduce the absorption bands and the transition probability between equivalent geometries of the defect at low temperatures by including many-body-perturbation corrections based on the GW approximation on top of the density functional theory. At higher temperatures, vacancies become mobile centers, enabling the reorientation of the whole defect and contributing to the dopant diffusion. The underlying mechanisms of the vacancy-mediated dopant diffusion are revisited, characterizing the activation energies of such technologically relevant processes and obtaining quantitative results in good agreement with experiment.
Vortex-induced vibrations of an elliptic cylinder of low mass ratio: Identification of new response branches
Authors: Sourav Kumar , Kumar Deepak , Sen Subhankar
Published: February 2020

The classical resonance branches that construct the response of a freely vibrating circular or elliptic cylinder at low Reynolds numbers, Re, are “initial” and “lower.” The existence of additional response branches, if any at low Re via alteration of controlling parameters, is unavailable in the literature. In this computational work, relating to a low mass ratio (m* = 1) and zero damping, i.e., m*ζ = 0 transverse-only vortex-induced vibrations of an elliptic cylinder over Re = 50–180, four response branches that are unreported in the literature are identified. The lock-in at such a low mass ratio is non-classical, and the new response branches are resolved close to the lock-in boundaries. These additional branches are designated as extended initial branch, extended lower branch, terminal branch, and quasi-periodic desynchronization branch. The method proposed by Kumar et al. [“Identification of response branches for oscillators with curved and straight contours executing VIV,” Ocean Eng. 164, 616–627 (2018b)] has been employed to identify the branches by locating the Re region concerning the change of slope and discontinuous jumps of oscillation frequency. It is further shown that branching at a low mass ratio depends on structural damping, oscillator shape, and degree-of-freedom.
Rotational and translational dynamics in dense fluids of patchy particles
Authors: Marín-Aguilar Susana , Wensink Henricus H. , Foffi Giuseppe , Smallenburg Frank
Published: February 2020

We explore the effect of directionality on rotational and translational relaxation in glassy systems of patchy particles. Using molecular dynamics simulations, we analyze the impact of two distinct patch geometries, one that enhances the local icosahedral structure and the other one that does not strongly affect the local order. We find that in nearly all investigated cases, rotational relaxation takes place on a much faster time scale than translational relaxation. By comparing to a simplified dynamical Monte Carlo model, we illustrate that rotational diffusion can be qualitatively explained as purely local motion within a fixed environment, which is not coupled strongly to the cage-breaking dynamics required for translational relaxation. Nonetheless, icosahedral patch placement has a profound effect on the local structure of the system, resulting in a dramatic slowdown at low temperatures, which is strongest at an intermediate “optimal” patch size.
A framework for prioritising prescribed burning on public land in Western Australia
Authors: Howard Trevor , Burrows Neil , Smith Tony , Daniel Glen , McCaw Lachlan
Published: February 2020

A risk-based framework for targeting investment in prescribed burning in Western Australia is presented. Bushfire risk is determined through a risk assessment and prioritisation process. The framework provides principles and a rationale for programming fuel management with indicators to demonstrate that bushfire risk has been reduced to an acceptable level. Indicators provide targets for fuel management that are applicable throughout the state and can be customised to meet local circumstances. The framework identifies eight bushfire risk management zones having broad consistency of land use, fire environment and management approach, which combine to create a characteristic risk profile. Thirteen fuel types based primarily on structural attributes of the vegetation that influence fire behaviour are recognised and used to assign models for fuel accumulation and fire behaviour prediction. Each bushfire risk management zone is divided into fire management areas, based on the management intent. These are areas where fuels will be managed primarily to minimise the likelihood of fire causing adverse impacts on human settlements or critical infrastructure, to reduce the risk of bushfire at the landscape scale or to achieve other land management outcomes. Indicators of acceptable bushfire risk are defined for each fire management area and are modified according to the distribution of assets and potential fire behaviour in the landscape. Risk criteria established in the framework can be converted to spatially represented targets for fuel management in each zone and can be reported against to measure the effectiveness of the fuel management program. In areas where the primary intent is to reduce the risk of bushfire at the landscape scale, managers have flexibility to apply prescribed fire in ways that maintain and enhance ecosystem services, nature conservation and landscape values through variation in the seasonality, intensity and scale of planned burning.
Anforderungsprofil für Polizei, Staatsanwaltschaft, Rechtspflege und Gericht zum Erkennen und Umsetzen des Dolmetsch-
und Übersetzungsbedarfs
Authors: Gradinčević-Savić Dragoslava
Published: February 2020

The European Convention on Human Rights and EU Directive 2010/64/EU on the right to interpretation and translation
have been transposed into national law. At national level, legislation has led to fundamental changes. In recent years, and
varying with the work area and phase of the legal procedure, different needs for interpreters and translators have arisen. Also,
the required profile of translators, and especially of interpreters, has changed – due to the implementation of new technologies.
What role and status should interpreters and translators now play and have, and above all what skills and knowledge should an
interpreter or translator working in the legal field now have.
Video-mediated remote interpreting in healthcare
Authors: Havelka Ivana
Published: February 2020

Interpreters face distinct challenges when deployed remotely via video link, due to their virtual presence but
physical absence in the conversation. Depending on the interpreting service, interpreters can also be exposed to greater
spontaneity and hence increased pressure if video-mediated interpreting is offered as an instant service. The examples discussed
in this paper draw on an interpreting studies-based analysis of the Austrian pilot project “Video-mediated interpreting in
healthcare.” In this study data were generated by means of an observational protocol, five recordings of authentic video-mediated
interpreted communicative events, five retrospective interviews with the interpreters from the recorded video-mediated interpreted
communicative events, and eight expert interviews with all interpreters from the pilot project. The scope of this article is to
present some of the main findings and draw attention to a crucial strategy used in remote interpreting, namely a reliance on
relevant sensory awareness.
“Choose yourself?”
Authors: Sinanan Jolynna
Published: February 2020

Social media is often assumed to espouse ego-centred networking. Yet by comparing posts to Facebook and Instagram, it becomes apparent that the experience and aspirations of the individual are often embedded in structures of family and other institutions that have been historically determined. This article locates images posted by women to two social media platforms, Facebook and Instagram, within the Caribbean island of Trinidad’s wider history of the significance of visibility and visuality. What individuals choose to make visible and its consequences form a visual language in which Trinidadians are entirely fluent. By extension, images are used to communicate forms of differentiated identity that are made visible through social media.

The material gathered was based on 15 months of ethnographic research in a semi-urban town in Trinidad where, generally, uses of social media are expressive of a place-based sense of identity. The town is simultaneously a place that urban dwellers look down on and villagers look up to. Visual content posted to Facebook and Instagram reveal that while individuals seek to craft and shape images and aesthetics according to their own tastes, this must be done in a socially acceptable way; that is, placing emphasis on group conformity is far more of a social value than expressing individual distinction. Social media in this context communicates the imagination of oppositional futures and a divergence of lifestyles for young women: those who identify with being locally-oriented and those who identify with being globally-oriented.
Sutura2.0
Authors: Friend Juliana
Published: February 2020

Wolof ethics ofsutura“discretion” have historically conflated perceived communicative excess with bodily contagion and associated both with queer subjects. For health non-governmental organizations (NGOs), online dating among gay Senegalese men presents two risks tosutura: contagious sex and contagious discourse. A Senegalese eHealth NGO hires gay men to send HIV/AIDS prevention messages through Facebook and online dating websites in order to contain HIV and, invokingsutura, contain queer communication and bodies. This NGO projects a heteronormative metapragmatic model of health communication, casting information as instrument of containment, and a unitary, de-eroticized digital self as informational messenger. In what I call queer biocommunicability, eHealth activists create erotically seductive digital personae incongruous with offline characteristics. Construed as communicative-bodily excess, digital seductions actually facilitate information exchange. NGOs instrumentalize queer biocommunicability to bolster a care framework that marginalizes queer subjects. This paper traces historical underpinnings and ethical-political implications of heteronormative biocommunicability’s dependence on queer transgression.
Erasmus students in an Irish studyabroad context
Authors: Magliacane Annarita
Published: February 2020

While second language (L2) pragmatics research has predominantly investigated speech acts, little attention has been given to pragmatic markers (PMs) (Müller, 2005). Research demonstrates that PM use by learners is limited (Liao, 2009) and that their production is aided by native speaker (NS) contact (Sankoff et al., 1997). Thus, if study abroad (SA) provides a combination of instructed and naturalistic input / exposure, the analysis of PM development gives insights into the role of language exposure during SA. Against this background, this article investigates the use of PMs in L2 English during an Erasmus programme in Ireland. Data were collected using sociolinguistic interviews (Labov, 1984) and the PMs studied were ‘like’ and ‘well’. These PMs were tracked longitudinally to investigate differences in frequency and use. Findings were analysed quantitatively and compared with English NSs. Results point to an increase in frequency but also reveal constraints on the use of the PMs studied.
Intercultural guidance abroad
Authors: Moreno Bruna Ana Maria , Goethals Patrick
Published: February 2020

Contemporary research on language and intercultural learning during study abroad programs has led scholars to challenge the immersion assumption and to argue the need for interventions that would deepen and extend the learning potential of this experience (Jackson, 2018). In an attempt to underscore this point, this paper reports on an experimental study which explores the impact of a pedagogical intervention where two groups of Flemish students (n = 34) are tracked during their Erasmus stay in Spain. One group of students (n = 14) is enrolled in the intervention and encouraged to engage in linguistically and culturally challenging encounters while the other group is not (n = 20). Both language use and social network formation are examined through an extended version of the SASIQ questionnaire (Dewey et al., 2013), completed following their experience abroad. Although it is not straightforward to grasp the influence of such curricular initiatives on learner interaction and language contact abroad, results from the study are consistent with previous findings on the importance of fostering social interactions for L2 development. Furthermore, a number of social network variables also point out how L2 self-perceived progress can be fostered abroad.
Overall L2 proficiency maintenance and development among returning ERASMUS study abroad participants
Authors: Hessel Gianna
Published: February 2020

This study examines the sustainability of gains in overall English proficiency made by 81 German students on ERASMUS study abroad placements in the UK (lasting one term or one academic year) following their return to their home country. Students were tracked using C-tests and questionnaires from pre-study abroad up until nine months post-return. Their development was compared with that of 25 peers who applied for ERASMUS placements, but continued studying at home. The analysis presented focuses on the post-return phase and includes factors associated with individual differences in L2 proficiency development post-return, self-perceived L2 skills development, and returnees’ perceived needs regarding further language classes. Results show that students tended to sustain gains in overall L2 proficiency made during study abroad. L2 proficiency level achieved by the end of study abroad, self-efficacy in using the L2 in social interactions, and majoring in English were all positively associated with post-return L2 development.
Quantum management: the practices and science of flourishing enterprise
Authors: Laszlo Chris
Published: February 2020

Quantum Management brings to light the power of direct-intuitive practices – such as meditation, nature immersion, and countless others – to transform a leader’s consciousness as the highest point of leverage for entrepreneurial creativity embedding social purpose. Layered on top of such practices are insights from quantum physics and related disciplines that offer a radically different view of organizational life. Such insights help managers understand how direct-intuitive practices work to change a person at the deepest level of their identity. Direct-intuitive practices give managers an experience of wholeness that heightens their awareness of how their actions impact others and the world. Such awareness leads managers to pursue business as a force for good not only because of the analytic business case for it, which remains important, but because of who they are being. Recent developments in science inform their experience by re-framing their understanding of the nature of reality.
Statistical limitations in proton imaging
Authors: Collins-Fekete Charles-Antoine , Dikaios Nikolaos , Royle Gary , Evans Philip M.
Published: February 2020

Proton imaging is a promising technology for proton radiotherapy as it can be used for: (1) direct sampling of the tissue stopping power, (2) input information for multi-modality RSP reconstruction, (3) gold-standard calibration against concurrent techniques, (4) tracking motion and (5) pre-treatment positioning. However, no end-to-end characterization of the image quality (signal-to-noise ratio and spatial resolution, blurring uncertainty) against the dose has been done. This work aims to establish a model relating these characteristics and to describe their relationship with proton energy and object size. The imaging noise originates from two processes: the Coulomb scattering with the nucleus, producing a path deviation, and the energy loss straggling with electrons. The noise is found to increases with thickness crossed and, independently, decreases with decreasing energy. The scattering noise is dominant around high-gradient edge whereas the straggling noise is maximal in homogeneous regions. Image quality metrics are found to behave oppositely against energy: lower energy minimizes both the noise and the spatial resolution, with the optimal energy choice depending on the application and location in the imaged object. In conclusion, the model presented will help define an optimal usage of proton imaging to reach the promised application of this technology and establish a fair comparison with other imaging techniques.
Two types of highly efficient electrostatic traps for single loading or multi-loading of polar molecules*
Authors: Wei Bin , Guo Hengjiao , Ji Yabing , Hou Shunyong , Yin Jianping
Published: February 2020

Two novel electrostatic traps named octopole-based disk electrostatic trap (ODET) and tubular-based disk electrostatic trap (TDET) are proposed for trapping cold polar molecules in low-field-seeking states. Using MgF as the target molecule, single loading and multi-loading methods are numerically simulated with varied incident velocities of slow molecular beams in the two types of traps, respectively. In ODET, with an incident velocity of 10 m/s, a highest loading efficiency of 78.4% or 99.9% has been achieved under the single loading or multi-loading operation mode. In TDET, with an incident velocity of 11 m/s, a highest loading efficiency of 81.6% or 106.5% has been achieved using the two loading methods, respectively. With such high loading efficiencies, the trapped cold molecules can be applied in the researches of cold collisions, high precision spectroscopy, and precision measurements. Especially, together with a blue-detuned hollow beam, the new electrostatic traps proposed here offer a new platform for the following gradient-intensity cooling of MgF molecules, which may provide a new way to produce high density ultracold molecules.
A survey of neural network accelerator with software development environments
Authors: Song Jin , Wang Xuemeng , Zhao Zhipeng , Li Wei , Zhi Tian
Published: February 2020

Recent years, the deep learning algorithm has been widely deployed from cloud servers to terminal units. And researchers proposed various neural network accelerators and software development environments. In this article, we have reviewed the representative neural network accelerators. As an entirety, the corresponding software stack must consider the hardware architecture of the specific accelerator to enhance the end-to-end performance. And we summarize the programming environments of neural network accelerators and optimizations in software stack. Finally, we comment the future trend of neural network accelerator and programming environments.
Accelerating hybrid and compact neural networks targeting perception and control domains with coarse-grained dataflow reconfiguration
Authors: Wang Zheng , Zhou Libing , Xie Wenting , Chen Weiguang , Su Jinyuan , Chen Wenxuan , Du Anhua , Li Shanliao , Liang Minglan , Lin Yuejin , Zhao Wei , Wu Yanze , Sun Tianfu , Fang Wenqi , Yu Zhibin
Published: February 2020

Driven by continuous scaling of nanoscale semiconductor technologies, the past years have witnessed the progressive advancement of machine learning techniques and applications. Recently, dedicated machine learning accelerators, especially for neural networks, have attracted the research interests of computer architects and VLSI designers. State-of-the-art accelerators increase performance by deploying a huge amount of processing elements, however still face the issue of degraded resource utilization across hybrid and non-standard algorithmic kernels. In this work, we exploit the properties of important neural network kernels for both perception and control to propose a reconfigurable dataflow processor, which adjusts the patterns of data flowing, functionalities of processing elements and on-chip storages according to network kernels. In contrast to state-of-the-art fine-grained data flowing techniques, the proposed coarse-grained dataflow reconfiguration approach enables extensive sharing of computing and storage resources. Three hybrid networks for MobileNet, deep reinforcement learning and sequence classification are constructed and analyzed with customized instruction sets and toolchain. A test chip has been designed and fabricated under UMC 65 nm CMOS technology, with the measured power consumption of 7.51 mW under 100 MHz frequency on a die size of 1.8 × 1.8 mm2.
A quad-band slot antenna with spiral stub and interdigital CPW Feed
Authors: Archevapanich T. , Chomtong P. , Akkaraekthalin P.
Published: February 2020

This paper proposes a quad-band slot antenna with spiral stub and interdigital CPW feed. The antenna has a compact size and can be used for four frequency bands of 1.8 GHz, 2.45 GHz, 3.7 GHz and 5.2 GHz applicable for LTE, WiMAX and WLAN systems. The important technique designs of the proposed antenna are divided into 2 parts. The first part includes the stepped slot antenna added with square-shaped spiral stub. As a result, the resonance frequencies of the third and fourth harmonics can be controlled as desired. For the second part, the technique of interdigital capacitive CPW is employed at the feeding line, resulting in length reduction from λ/4 of the conventional one to λ/8, which is caused by the slow-wave effect. Moreover, with this technique the resonance frequency of the second harmonic can be independently controlled. The optimized antenna has good performances for all frequency bands with bandwidths of 190 MHz (1.72 GHz-2GHz) at 1.8 GHz band, 280 MHz (2.34GHz-2.53GHz) at 2.45 GHz band, 410 MHz (3.54 GHz-3.95 GHz) at 3.7 GHz band and 220 MHz (5.10 GHz-5.32 GHz) at 5.2 GHz band, respectively.
Approximation of the maximally flat filter by using Bézier curve with an exponential function
Authors: Purahong B , Kanjanasurat I , Sithiyopasakul P , Chutchavong V , Pintavirooj C
Published: February 2020

This paper presents a design of filter by using Bézier curve with an exponential function. This paper used the advantage of The Bézier curve which had ability for approximation and an exponential function which had the adaptable parameters of the polynomial. It can adjust the characteristic of frequency response for the best performance. The simulation results of various setting show the frequency response, step response. The comparison of response between the Bernstein filter and Butterworth filter in order two show that the rise time of Bernstein filter better than Butterworth filter and Bézier curve filter has not overshoot. Furthermore, the stability Nyquist criterion has been used to guarantee the stability of the transfer function.
Approach to user interfaces development based on semantic model of user activity
Authors: Belikova S A , Rogozov Y I , Sviridov A S , Shevchenko O V , Egorov A V , Koltunova L V
Published: February 2020

In this paper there is proposed a method of user interface design, which is based on semantic model of user activity in the domain, which is formed by the end user himself in natural language, as a source data for design. This description is further transformed into a mechanism of action, the combination of which can be called a model. Also the paper contains the analysis of possible models used in model-oriented approaches to interface development, advantages and features of the proposed model are highlighted. Based on the model in the form of action mechanisms, the user interface of the information system is formed. The paper contains the general example of the process of user interface construction.
Method of designing the modular structure of the information system
Authors: Rogozov Y I , Kucherov S A , Lipko J Y , Belikov A N , Maakot A Q , Belikova S A
Published: February 2020

The overwhelming majority of modern information systems are built on the basis of a modular principle. This principle involves the creation of independent software subsystems that perform separate groups of tasks. The success of building an information system depends on the quality of the division of tasks into groups. Known approaches to modular partitioning are based on the organizational structure of the enterprise and job descriptions of employees. This leads to unmanaged intermodular connections and loss of the advantages of the modular approach (flexibility, interchangeability of modules, etc.). To solve this problem, the article proposes a new method for designing a modular structure of information systems based on the analysis of information and information flows. This allows minimizing inter-module communications and building systems that are independent of the organizational structure of the enterprise.
Regional determinants of China’s consumption-based emissions in the economic transition
Authors: Zheng Heran , Zhang Zengkai , Wei Wendong , Song Malin , Dietzenbacher Erik , Wang Xingyu , Meng Jing , Shan Yuli , Ou Jiamin , Guan Dabo
Published: February 2020

China has entered the economic transition in the post-financial crisis era, with unprecedented new features that significantly lead to a decline in its carbon emissions. However, regional disparity implies different trajectories in regional decarbonisation. Here, we construct multi-regional input–output tables (MRIO) for 2012 and 2015 and quantitatively evaluate the regional disparity in decarbonisation and the driving forces during 2012–2015. We found China’s consumption-based emissions peaked in 2013, largely driven by a peak in consumption-based emissions from developing regions. Declined intensity and industrial structures are determinants due to the economic transition. The rise of the Southwest and Central regions of China have become a new feature, driving up emissions embodied in trade and have reinforced the pattern of carbon flows in the post-financial crisis period. Export-related emissions have bounced up after years of decline, attributed to soaring export volume and export structure in the Southeast and North of the country. The disparity in developing regions has become the new feature in shaping China’s economy and decarbonisation.
Simulation study on ±320kV DC power cable steady-state temperature field distribution and its influencing factors
Authors: Shi Zhihan , Yan Youxiang , Zhang Weiwei , Yang Zhipeng , Wu Pengpeng , Lin Weilin , Zhu Wenzhang
Published: February 2020

Temperature distribution is an important parameter in the operation of DC cables, while there are few studies at present. In this paper, the steady-state temperature field distribution of DC cable was calculated by simulation, and the factors including conductor current and outer surface temperature were discussed and analyzed. The results showed that there is a temperature gradient in the radial direction of the cable; Both the conductor current and the outer surface temperature have a significant effect on the overall temperature of the cable; The increase in the conductor current and the outer surface temperature will significantly increase the conductor temperature. However, the insulation temperature difference changes little.
Study on insulation performance of EPR cable terminal containing metal particles
Authors: Jisheng Huang , Enxin Xiang , Lini Li
Published: February 2020

The 35kV EPR cable terminal is widely used in the distribution network. During the production process, metal particles are easily introduced due to environmental and technological reasons, resulting in frequent breakdown of the terminal breakdown accident. In order to study the influence of metal particles on the insulation performance of EPR cable terminals, a model of metal particles defect in cable terminals on the extension line of the main insulation and the control tube is built. The electric field distribution of cable terminals under power frequency voltage is calculated by COMSOL simulation software. At the same time, a sample of cable terminals containing metal particles is made, and local discharge is used. The partial discharge information of the cable terminal sample is tested by the electric test platform. The results show that the introduction of metal particles will increase the electric field distortion inside the cable terminal, strengthen the discharge activity of the cable terminal, and increase the discharge amount significantly, which seriously affects the insulation performance of the EPDM cable terminal.
Energy management for isolated microgrid to mitigate “demand & abandon” phenomenon with two types of subsidy policies
Authors: Liming Li , Weidong Chen , Xueqi Shi
Published: February 2020

This paper presents a game model about the microgrids energy management problem and its implementation in the centralized energy management system for isolated microgrids. The model mainly provides power management strategies based on the problem that power is imbalance, and analyses the impact of two types of subsidy policies on “Demand & Abandon” in the operation of microgrid. By analysing the experiment results, we conclude that: 1) energy storage device improves the flexibility of power usage strategy; 2) the implement of infrastructure subsidy policies can solve “Demand & Abandon” in a better way while the electricity subsidy policies are invalid.
Stability analysis of DC microgrid considering the action characteristics of relay protection
Authors: Huang Lu , Qun YU
Published: February 2020

The stability of microgrid is the key issue of microgrid operation control. This paper focuses on the transient stability after the correct operation of relay protection. In this paper, 400V DC microgrid with photovoltaic and energy storage system is taken as the research object. Research on the fault characteristics of voltage and current after the system is subjected to short-circuit, it is proposed to introduce current differential protection. With bus voltage as the only indicator, whether the transient stability is improved after the protection system operates correctly. The DC microgrid is modeled and simulated based on MATLAB/Simulink to confirm the validity of the proposed statement. The simulation results show that the fault can be correctly located, accurately isolated and timely removed by the protection system after the short-circuit fault occurs, bus voltage is restored to maintain stable operation of the system.
Optimal design of energy sstorage capacity of distributed photovoltaic microgrid based on random error model
Authors: Jin Longfei , Ju Zhenhe , Duan Desheng , Kong Fanju
Published: February 2020

The allocation of capacity of distributed photovoltaic energy storage System has always been an urgent problem to be solved, and reasonable capacity allocation plays an important role in stabilizing the power fluctuation of PCC node and smoothing the load output. In order to reasonably configure energy storage, this paper establishes an energy storage model based on the analysis of random error, which combines load prediction error and the randomness of photovoltaic output prediction error to meet the characteristics of normal distribution, and estimates the random error not considered by the original model, so that the results calculated by the model are more accurate. Combining with the example of the Liaoning branch of China Tower, and the capacity configuration of the photovoltaic energy storage system is verified by combining its load power and photovoltaic power curve.
Research on protection configuration of AC/DC hybrid distribution network in industrial park
Authors: Wenjing XIE , Feng Kangheng , Jianzong HE , Zheng Fenglei , Zhong Rongfu
Published: February 2020

Under the rapid development of power electronics technology, AC/DC hybrid power supply can be used to comprehensively solve the demand for source and supply.The article takes the first comprehensive demonstration project of the dual-stage AC-DC hybrid system based on multi-function power electronic transformer cluster in China as the research object.A distributed renewable energy system simulation platform with AC/DC hybrid is established in the hardware RTDS to simulate and analyze the fault characteristics under different conditions.Based on the fault characteristics and the principle of protection division, in order to ensure that the ranges between the protection zones overlap each other and cover the entire AC-DC distribution network,This paper studies the specific protection zones and configurations for the industrial park system, and has developed a comprehensive protection configuration plan.
Research on key technologies of highly reliable flexible distribution facing tidal load
Authors: Qiang LIU , Shen Peifeng , Di WU , Zhuofei YU , Jian LUO , Zhao Chen
Published: February 2020

Under the background of steady development of DC transmission and distribution technology, a series of pilot projects and demonstrations have been carried out gradually in the Engineering application of DC distribution network. In this paper, the typical mode of low voltage DC distribution network- flexible distribution system, is taken as the main research object. The interface between low voltage DC distribution and AC distribution, the distributed energy resource and electric vehicle, and the characteristics of electrical load is considered synthetically. The DC voltage level, power supply radius and capacity, the mode of grounding and connection, and topology structure are analyzed and studied. The typical DC distribution structure is analyzed by simulation. And the DC network load mutual supply experiment system suitable for different scenarios is constructed.
Advanced design and optimization of wind turbines based on turbine theories
Authors: Zhang Zh
Published: February 2020

A review of wind turbine technology showed that many flaws in both the flow models and computations are involved in the traditional fundamentals. While traditional methods for design and computation are all based on the airfoil theory, a new method based on turbine theories has been developed and is shown to be ideally applicable. Against the traditional method, the new method also considers non-uniform pressure distribution in flows downstream of the rotor plane and is thus highly accurate. The blade efficiency or tip swirl number has been introduced. It enables computation of the power coefficient to be very reasonable. Its optimum can be directly applied to the geometrical design of turbine blades. Between the tip speed ratio X, blade efficiency e, and power coefficient cp, a closed solution of both the optimum design and the operation of wind turbines exists. It is demonstrated that the maximum achievable power coefficient can be 10% larger than that predicted by all previous theories.
Research on case management technology of power market simulation
Authors: Gaoqin Wang , Ailin Chen , Jianhu Lü , Hong Zhang , Yaxian Zheng
Published: February 2020

The construction of electric power spot market in China is gradually advancing. Since the operation of electric power spot market is affected by various factors such as grid structure, supply and demand situation and external environment, and is closely related to grid operation, it is difficult to predict through theoretical analysis and estimate the operational effect of the market, so before the formal operation of the power spot market, it is necessary to verify and analyze the operational process and operational effects of the market. In order to facilitate the recording of market operation process and result data under various simulation scenarios and to carry out data comparison and to analyze the causes and influencing factors of market operation effects, this paper proposes case management and case data comparison of the electricity market operation simulation. The case management is used to manage the process and result data of the market operation simulation, and support the data comparison and analysis of different simulation scenarios, it provides technical support to the verification analysis of the operation effect of the power market and the effective factors.
Analysis of DC inter-electrode fault overvoltage in AC/DC hybrid power system
Authors: Zhong Rongfu , Siwei WAN , Yunfeng XIA , Dongliang WEI , Wenzhi HE
Published: February 2020

AC/DC hybrid power system has become an important distribution system for high-proportion distributed renewable energy consumption and multi-energy supply. Among the DC-side fault overvoltage, the inter-electrode fault overvoltage is the most harmful to the system. In order to analyze the principle of overvoltage generation, this paper establishes a mathematical model for AC/DC hybrid power system, and researches the mechanism of inter-electrode fault overvoltage generation on the DC side of the system, and builds a Matlab/Simulink simulation model so that gets the simulation analysis results of lOkV DC and ±375V DC side in the system. The research shows that the system high-frequency mathematical model relation which obtained according to the mathematical mode is belongs to the coupled nonlinear time-varying system. The DC-side overvoltage development can be divided into three stages: after happening of the fault until the converter station is locked, after the converter station is locked until the fault is removed, after removal of the fault until the converter station is unlocked. Through modeling and simulation, it is verified that the development process of overvoltage is consistent with the theoretical analysis. According to the research conclusion, the method of ‘arrester + parallel resistance + grounding device’ is proposed to protect the DC side overvoltage of the system.