bluuebunny/crossref_metadata_2025 huggingface dataset:
Identification of Precursory Anomalies before Moderate-strong Earthquakes in Junction of Shanxi-Hebei-Inner Mongolia Area
Authors: Hong Li
Published: November 2020

In this paper, we take the Junction of Shanxi-Hebei-Inner Mongolia area as study region using earthquake corresponding relevancy spectrum method (ECRS method) to identify comprehensive precursory anomalies before moderate-strong earthquake. On base of single-parameter relevancy spectrum database with target earthquake magnitude as Ms4.7 and initial earthquake magnitude as Ms1, we carry on multi-parameter analysis and find that result with time interval of 9 months and anomaly threshold with 0.40 times standard deviation has better prediction efficiency. Its anomaly corresponding rate and earthquake corresponding rate are 6/10 and 9/9 respectively.
A new method of multi-beam real-time attitude compensation data processing
Authors: Yonghou Zhang , Fumin Xiao , Shaohua Jin , Gang Bian
Published: November 2020

The traditional method for processing multi-beam real-time attitude compensation data did not consider the influence of attitude compensation error, which left attitude residual in data. So a new method for processing multi-beam data of real-time attitude compensation was proposed. By studying the nature of attitude compensation error, the calculation method of systematic attitude compensation error was put forward. The concept of correction threshold was introduced and the specific determination method was given. Finally, combining with the principle of real-time attitude compensation, a systematic attitude compensation error correction method, which makes use of a tracking algorithm considering attitude to make secondary attitude correction, was proposed, and the specific processing flow was given. By comparing the data processing accuracy of the tradition method and the new method, the results showed that the new method can effectively reduce the influence of systematic attitude compensation error, and significantly improve the data processing accuracy.
Deformation prediction analysis of vertical displacement of deep foundation pit based on LIBSVM
Authors: Zhao Yueyao , Zhang Jiawei , Li Haojie
Published: November 2020

The reliable prediction of the surface vertical displacement deformation of deep foundation pits is of great significance to the excavation of large foundation pits. The support vector machine model (LIBSVM) has become a hot spot in the prediction of deep foundation pit deformation and provides a new prediction for the deformation of deep foundation pits. In this paper, taking the deep foundation pit of Daoxianghu Road Station in xx as an example, a prediction model of vertical displacement on the ground is established based on LIBSVM and analysis shows that the prediction results based on the model are in good agreement with the measured data, and the MSE reaches 0.0323. The model is effective and has an effective prospective skill.
Research on heavy metal pollution remediation technology in farmland soil
Authors: Shi Binli , Zhang Xiaohui , Gou Aiping
Published: November 2020

Soil is the foundation of agricultural sustainable development. After nearly 40 years of rapid economic development and highly intensive agricultural production, our country’s farmland soil is facing severe soil heavy metal pollution. The situation of heavy metal pollution in farmland soil in China is not optimistic and poses a threat to the safe production of agricultural products and food safety. Therefore, the treatment and restoration of soil heavy metal pollution has received extensive attention. According to the actual situation of soil pollution in our country, the prevention, control and remediation of soil heavy metal pollution has become a major national demand. This article discusses the current status of soil heavy metal pollution control in our country and the main remediation technologies. Aiming at the characteristics and shortcomings of various remediation technologies, it proposes the improvement and development direction of heavy metal contaminated soil remediation technology to provide reference for soil remediation technology research.
Performance analysis of GNSS/INS loosely coupled integration systems under GNSS signal blocking environment
Authors: Wang Mengke , Yu Peidong , Li Yunzhi
Published: November 2020

Global Navigation Satellite System (GNSS) and Inertial Navigation System (INS) are the most widely used navigation systems at present. Aiming at the limitations of a single system application, this paper uses kalman filter to fuse the pose information provided by GNSS and INS, respectively. GNSS has the characteristics of being easily affected by the environment but with high absolute positioning accuracy. INS has the characteristics of high sampling frequency and autonomous navigation, but the error accumulates with time. Combining the advantages of the two systems to achieve the purpose of obtaining higher-precision pose information. In addition, aiming at the problem that GNSS/INS integration cannot provide continuous, stable and reliable navigation solutions under the GNSS signal blocking environment, a smoothing post-processing algorithm for GNSS/INS integration is studied. Through experimental verification, this algorithm can effectively improve the pose accuracy under GNSS signal blocking environment.
Preparation of high molecular weight polyvinyl alcohol by emulsifier-free emulsion polymerization
Authors: Hong Xinqiu , Zou Liming , Zhang Jingyang , Wang Liujian
Published: November 2020

In this report, high molecular weight polyvinyl alcohol (PVA) was prepared by emulsifier-free emulsion polymerization, using the redox initiator of potassium persulfate (KPS) / N,N-dimethyl ethanolamine (DMEA). The structure and property of PVA were studied by using ubbelohde viscometer, fourier transform infrared spectroscopy (FTIR), nuclear magnetic resonance hydrogen spectroscopy (1H-NMR), X-ray Diffraction (XRD), differential scanning calorimeter (DSC) and thermo gravimetric analysis (TGA). The results showed that the viscosity-average degree of polymerization (DP) of PVA 7506, which was much higher than that of PVA commonly used in industrial production. The syndiotacticity and crystallinity of PVA was 54.2 % and 35.6 %, respectively.
Simulation Analysis on Dangerous Goods Accident in Container Terminals
Authors: Jianzhe Qiao , Youping Shou , Junjie Zhao
Published: November 2020

In general, transportation of Dangerous Goods in the port and shipping industry is mainly based on the container. This paper summarized the types of container terminal accidents, and put forward a method to select source of pollutants, and showed pollution range of typical accidents, provided the basis for the decision of management department. Taking a domestic container terminal as an example, the calculation results show that, under the premise of taking corresponding measures, the pollution range of accidents is not wide, and the risk is controllable.
Technical exploration of horizontal screw centrifuge in solid-liquid separation of flowback liquid in offshore production
Authors: Hui Su , Ya-qi HE , Yu ZHAO , Chao SUN , Jun MA , Hong-ze Xia , Wen-jie MA , Pei Sun
Published: November 2020

This paper introduces the structure and working principle of horizontal screw centrifuge with large length diameter ratio and its technological process in the separation of liquid-solid liquid in the flowback of offshore production. The effects of different water addition ratio, rotating speed and demulsifier content on the separation effect of centrifuge were investigated by indoor experiments. The orthogonal test was used to optimize the parameters, and the optimal combination of parameters was as follows: water ratio was 1.5/1, rotating speed was 3000r / min, demulsification was achieved The dosage was 400mg / L. The optimum rotating speed of the centrifuge is 2000r / min, and the field pilot test is carried out for 10 consecutive days with the best combination of parameters. The results are as follows: the average mechanical impurity rate of oil phase produced by horizontal screw centrifuge is 0.465%, and the average oil content in water phase is 183mg / L. The separation effect is stable.
Graphene-based tunable coding metasurfaces in terahertz band
Authors: Feng Jialin , Shi Hongyu , Zhang Anxue , Xu Zhuo
Published: November 2020

Two graphene-based tunable coding metasurfaces are proposed for beam steering in terahertz band. The coding metasurfaces are composed of the unit cell with a sandwich-like structure, which contains the top layer of anisotropic rectangular graphene structure, intermediate dielectric layer and ground plane. The designed metasurfaces can be dynamically adjusted since the characteristics of unit cell are changed by the chemical potential of graphene. When the relaxation time and chemical potential of graphene are 0.8 ps and 0.85 eV, respectively. The coding metasurfaces could realize beam steering in 1.30 THz-1.70 THz. On the other hand, when the chemical potential of graphene is 0 eV, two metasurfaces without beam steering in this band. The designed graphene-based tunable coding metasurfaces has potential application value in the fields of terahertz communication, sensing, etc.
Accès aux soins face à l’enjeu de la rééducation maxillo-faciale dans les dyspraxies oro-faciales – Enquête auprès des orthodontistes en France
Authors: Daunay Sarah , Breton-Torres Isabelle , Leclercq Pierre , Jammet Patrick
Published: November 2020

Introduction : L’inégalité d’accès aux soins de rééducation maxillo-faciale pour les patients traités en orthodontie est un problème récurrent auquel sont confrontés les praticiens dans leur prise en charge. Afin de pallier cette pénurie de rééducateurs formés, certains orthodontistes utilisent des exercices ainsi que des appareils fonctionnels et coercitifs et prodiguent des conseils d’auto-rééducation ou d’hygiène de vie. L’objectif primaire de cette étude est de déterminer, dans le cadre des dyspraxies oro-faciales, la proportion de patients pris en charge par un rééducateur spécialisé dans le cadre de leur traitement d’orthodontie, ainsi que les attentes des praticiens. L’objectif secondaire est de mettre en lumière le comportement des orthodontistes en cas d’absence de prise en charge de leur patient.

Matériel & Méthode : Cette étude épidémiologique, observationnelle, descriptive, transversale et unique, consiste en un questionnaire qui a été soumis par e-mail à 500 orthodontistes en activité en février 2018 en France. L’enquête a été réalisée sur le logiciel « Googleform », les statistiques étaient réalisées directement via le logiciel et les réponses ouvertes analysées de façon descriptives par les auteurs.

Résultats : 200 questionnaires ont été remplis. Parmi les orthodontistes adressant leurs patients chez un rééducateur spécialisé, 33% estiment que la totalité est prise en charge. Chez les 67% restant, 59% des orthodontistes pratiquent une rééducation par eux-mêmes.

Conclusion : L’enquête révèle un accès à la rééducation limité pour une partie de patients qui en auraient besoin.
Gestion orthopédique d’une ankylose de l’ATM chez l’enfant
Authors: Villalon-Pooley Pamela , Hernandez-Veliz Camila , Pinto-Chavez Maria Fernanda , Bourdiol Pierre
Published: November 2020

Parmi les fractures cranio-faciales, celles affectant le condyle mandibulaire font partie des fractures les plus souvent rencontrées chez le patient en âge pédiatrique. L’évolution sans traitement peut produire une ankylose temporo-mandibulaire entraînant troubles fonctionnels et asymétrie de la croissance cranio-faciale. Le traitement traditionnellement chirurgical est d’un pronostic généralement réservé.

Dans cet article est présenté le cas d’un patient, âgé de quatre ans, atteint d’ankylose fibreuse de l’articulation temporo-mandibulaire gauche, suite probable d’une fracture du col du condyle non-diagnostiquée. La libération fonctionnelle de la fibro-ankylose articulaire a été l’objectif de la première étape thérapeutique. Celle-ci a été suivie, à l’âge de sept ans, d’une distraction articulaire obtenue au moyen de butées occlusales controlatérales disposées côté droit. Ceci a produit un ajustement de la croissance dento-alvéolaire assurant à la fois un rattrapage du déficit de croissance unilatéral de départ et une néoformation condylienne par remodelage de l’articulation temporo-mandibulaire gauche. Quatre années après la mise en route de la phase orthopédique initiale, la fonction articulaire restaurée et l’équilibre facial obtenu restent stables chez ce jeune patient
Enhanced Oral Bioavailability and Improved Biological Activities of a Quercetin/Resveratrol Combination Using a Liquid Self-Microemulsifying Drug Delivery System
Authors: Jaisamut Patcharawalai , Wanna Subhaphorn , Limsuwan Surasak , Chusri Sasitorn , Wiwattanawongsa Kamonthip , Wiwattanapatapee Ruedeekorn
Published: November 2020

Both quercetin and resveratrol are promising plant-derived compounds with various well-described biological activities; however, they are categorized as having low aqueous solubility and labile natural compounds. The purpose of the present study was to propose a drug delivery system to enhance the oral bioavailability of combined quercetin and resveratrol. The suitable self-microemulsifying formulation containing quercetin together with resveratrol comprised 100 mg Capryol 90, 700 mg Cremophor EL, 200 mg Labrasol, 20 mg quercetin, and 20 mg resveratrol, which gave a particle size of 16.91 ± 0.08 nm and was stable under both intermediate and accelerated storage conditions for 12 months. The percentages of release for quercetin and resveratrol in the self-microemulsifying formulation were 75.88 ± 1.44 and 86.32 ± 2.32%, respectively, at 30 min. In rats, an in vivo pharmacokinetics study revealed that the area under the curve of the self-microemulsifying formulation
containing quercetin and resveratrol increased approximately ninefold for quercetin and threefold for resveratrol compared with the unformulated compounds. Moreover, the self-microemulsifying formulation containing quercetin and resveratrol slightly enhanced the in vitro antioxidant and cytotoxic effects on AGS, Caco-2, and HT-29 cells. These findings demonstrate that the self-microemulsifying formulation containing quercetin and resveratrol could successfully enhance the oral bioavailability of the combination of quercetin and resveratrol without interfering with their biological activities. These results provide valuable information for more in-depth research into the utilization of combined quercetin and resveratrol.
Chronic Exertional Compartment Syndrome in the Leg: Comparing Surgery to Conservative Therapy
Authors: Vogels Sanne , Ritchie Ewan D. , Hundscheid Henricus PH , van Someren Kim , Janssen Loes , Hoencamp Rigo , Scheltinga Marc R
Published: November 2020

The aim of this nonrandomized cohort study was to compare the clinical effectiveness of an elective fasciotomy with conservative treatment for chronic exertional compartment syndrome of the leg. Patients diagnosed with chronic exertional compartment syndrome who opted for surgery (n=188) completed a preoperative questionnaire and a 12-month postoperative questionnaire. Patients who continued conservative treatments (n=23) served as controls. Gender, age, sports activity or affected compartments were comparable, but intensity of pain was higher in the surgical group (at rest: 2.5±0.1 vs. 2.0±0.2, during exercise: 4.2±0.1 vs. 3.8±0.2; both p<0.05). Following treatment, surgical patients demonstrated a larger drop in intensity levels of pain (surgery 1.6±0.1, conservative 0.9±0.2, p=0.01) and tightness (surgery 1.4±0.1, conservative 0.4±0.3, p=0.00) during exercise. Success (good or excellent treatment effect) was attained in 42% of the surgical group compared to only 17% in the conservatively treated group (p=0.02). However, previous activity level was achieved in a mere 26% in the surgical treatment group and 35% in the conservative treatment group (p=0.33). A fasciotomy for chronic exertional compartment syndrome in the leg results in significantly decreased levels of pain and tightness and better satisfaction compared to patients who continued a conservative treatment regimen.
Exergaming and Aquatic Exercises Affect Lung Function and Weight Loss in Obese Children
Authors: Irandoust Khadijeh , Taheri Morteza , H’mida Cyrine , Neto Gabriel Rodrigues , Trabelsi Khaled , Ammar Achraf , Souissi Nizar , Chtourou Hamdi , Nikolaidis Pantelis T. , Rosemann Thomas , Knechtle Beat
Published: November 2020

We investigated the effect of exergames and aquatic exercises on lung function and weight loss in obese children. Sixty-one obese male primary-school children were randomly allocated to video game, aquatic exercise, and control groups. Lung functions and anthropometric variables were measured before and after the intervention and after one month (follow-up). In the video game group, an Xbox Kinect game was played for 60 min during three sessions a week. The aquatic aerobic exercise was performed three times per week and consisted of a warm-up, main exercises, and a cool down phase. For the video game group, there was a significant reduction in body weight between (i) pre- and (ii) post-intervention and follow-up. In the aquatic exercise group, there was a significant reduction in body weight between pre- and post-intervention and between pre-intervention and follow-up. Both exercise groups improved the waist/hip ratio index compared to the control group. Forced vital capacity was significantly improved in the follow-up of the video game group and the aquatic exercise group compared to the control group. A significant improvement was found in forced expiratory volume in the first second at post-intervention and follow-up in the video game and the aquatic exercise groups. Exergames and aquatic exercises improved weight loss and lung function in obese children.
Favipiravir and COVID-19: A Simplified Summary
Authors: Ghasemnejad-Berenji Morteza , Pashapour Sarvin
Published: November 2020

A recent outbreak of coronavirus disease 2019 (COVID-19) caused by the novel coronavirus designated as severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) started in Wuhan, China, at the end of 2019 and then spread rapidly all over the world. However, there are no specific antiviral therapies for COVID-19, using the agents which approved or in development for other viral infections is one of the potentially quickest ways to find treatment for this new viral infection. Favipiravir is an effective agent that acts as a nucleotide analog that selectively inhibits the viral RNA dependent RNA polymerase or causes lethal mutagenesis upon incorporation into the virus RNA. In view of recent studies and discussion on favipiravir, in this mini review we aimed to summarize the clinical trials studying the efficacy and safety of favipiravir in patients with COVID-19.
Epilepsy—Work-Up and Management in Children
Authors: Tenney Jeffrey R.
Published: November 2020

Pediatric epilepsy is a highly variable condition due to age-related expression of syndromes that require specific diagnosis, evaluations, and treatments. Children with epilepsy differ from their adult counterparts in many important ways, mostly related to the age-related expression of specific epilepsy syndromes. This results in many important considerations related to the epilepsy diagnosis, classification, evaluations to determine an etiology, as well as treatment guidelines. A good understanding of these factors will help to establish an accurate epilepsy diagnosis, which in turn will guide appropriate testing and treatment decisions. In this way, patients will have improved seizure outcomes, and families will be educated appropriately and provided with the most accurate prognostic information available. The purpose of this article is to review the diagnosis, work-up, and management of pediatric epilepsy.
Electroencephalogram Monitoring in Critical Care
Authors: Rubinos Clio , Alkhachroum Ayham , Der-Nigoghossian Caroline , Claassen Jan
Published: November 2020

Seizures are common in critically ill patients. Electroencephalogram (EEG) is a tool that enables clinicians to provide continuous brain monitoring and to guide treatment decisions—brain telemetry. EEG monitoring has particular utility in the intensive care unit as most seizures in this setting are nonconvulsive. Despite the increased use of EEG monitoring in the critical care unit, it remains underutilized. In this review, we summarize the utility of EEG and different EEG modalities to monitor patients in the critical care setting.
Academic incentives for enhancing faculty engagement with decision-makers—considerations and recommendations from one School of Public Health
Authors: Jessani Nasreen S. , Valmeekanathan Akshara , Babcock Carly M. , Ling Brenton
Published: November 2020

In academia, faculty are bound by three pillars of scholarship: Teaching, Research and Service. Academic promotion and tenure depend on metrics of assessment for these three pillars. However, what is and is not acceptable as “service” is often nebulous and left to the discretion of internal committees. With evolving requirements by funders to demonstrate wider impacts of research, we were keen to understand the financial and non-financial incentives for academic faculty to engage in knowledge translation and research utilization. Between November 2017–February 2018, 52 faculty from one School of Public Health (SPH) were interviewed. Data was analyzed using Atlas.Ti and furthermore with framework analysis. The appeal of incentives varied according to personal values, previous experiences, relevance of research to decision-making, individual capacities, and comfort ranging from instinctive support to reflexive resistance. Discussions around types of incentives elicited a plethora of ideas within 4 different categories: (a) Monetary Support, (b) Professional Recognition, (c) Academic Promotion, and (d) Capacity Enhancement. However, concerns included adverse incentives, disadvantaging suboptimally-equipped faculty, risk of existing efforts going unnoticed, vaguely defined evaluation metrics, and the impacts on promotion given that engagement activities often occur outside of the traditional grant cycle. With a shift in funder requests to demonstrate greater social return on their research investments, as well as renewed global attention to research, science and evidence for decision making, SPHs such as this one, are likely going to be concerned about the implications of an enhanced “service” pillar on the other two pillars: teaching and research. The role of incentives in enhancing academic engagement with policy and practice is therefore neither simple nor universally ideal. A tempered approach that considers the various professional aspirations of faculty, the capacities required, organisational culture of values around specific discovery sciences, funder conditions, as well as alignment with the institution’s mission is critical. Deliberations on incentives leads to a larger debate on how to we shift the culture of academia beyond incentives for individuals who are engagement-inclined to institutions that are engagement-ready, without imposing on or penalizing faculty who are choice-disengaged.
A new high-pressure cell for systematic in situ investigations of micro-scale processes in gas hydrates using confocal micro-Raman spectroscopy
Authors: Schicks Judith M. , Pan Mengdi , Giese Ronny , Poser Mathias , Ismail Nur Aminatulmimi , Luzi-Helbing Manja , Bleisteiner Bernd , Lenz Christoph
Published: November 2020

Natural gas hydrates are ice-like solids composed of gas and water molecules. They are found worldwide at all continental margins as well as in permafrost regions. Depending on the source of the enclathrated gas molecules, natural gas hydrates may occur as coexisting phases with different structures containing predominantly CH4, but also a variety of hydrocarbons, CO2 or H2S. For a better understanding of these complex hydrate formation processes on a micrometer level, an experimental setup with a new high-pressure cell was developed, which can be used in a pressure range between 0.1 MPa and 10.0 MPa. Peltier elements ensure precise cooling of the cell in a temperature range between 243 K and 300 K. The selected temperature and pressure ranges in which the cell can be used make it possible to simulate the formation of gas hydrates in their natural environment, e.g., on continental margins or in permafrost areas at a depth of up to 1000 m. The cell body is made of Hastelloy, which generally also allows the use of corrosive gases, such as H2S, in the experiments. The inner sample space has a volume of about 550 µl. A quartz window allows for microscopic observations and the systematic and continuous in situ Raman spectroscopic investigations of the forming hydrate phase mimicking natural conditions. Single point measurements, line scans, and area maps provide information on spatial heterogeneities regarding compositions and cage occupancies. The pressure cell can be operated as a closed system or as an open system with a defined continuous gas flow. The use of a continuous gas flow also allows for the in situ investigation of transformation processes induced by changes of the feed gas composition. In this paper, all details of the new experimental setup as well as preliminary results of our investigations on the formation of complex mixed hydrate systems both in the open and closed systems as well as the CH4–CO2 transformation process are presented.
Analytic gradients and derivative couplings for configuration interaction with all single excitations and one double excitation—En route to nonadiabatic dynamics
Authors: Teh Hung-Hsuan , Subotnik Joseph E.
Published: November 2020

We present analytic gradients and derivative couplings for the simplest possible multireference configuration interaction method, CIS-1D, an electronic structure Ansatz that includes all single excitations and one lone double excitation on top of a Hartree–Fock reference state. We show that the resulting equations are numerically stable and require the evaluation of a similar number of integrals as compared to standard CIS theory; one can easily differentiate the required frontier orbitals (h and l) with minimal cost. The resulting algorithm has been implemented within the Q-Chem electronic structure package and should be immediately useful for understanding photochemistry with S0–S1 crossings.
High-acoustic-index-contrast phononic circuits: Numerical modeling
Authors: Wang Wance , Shen Mohan , Zou Chang-Ling , Fu Wei , Shen Zhen , Tang Hong X.
Published: November 2020

We numerically model key building blocks of a phononic integrated circuit that enable phonon routing in high-acoustic-index waveguides. Our particular focus is on the gallium nitride-on-sapphire phononic platform which has recently demonstrated high acoustic confinement in its top layer without the use of suspended structures. We start with the systematic simulation of various transverse phonon modes supported in strip waveguides and ring resonators with sub-wavelength cross section. Mode confinement and quality factors of phonon modes are numerically investigated with respect to geometric parameters. A quality factor of up to 108 is predicted in optimized ring resonators. Next, we study the design of the phononic directional couplers and present key design parameters for achieving strong evanescent couplings between modes propagating in parallel waveguides. Last, interdigitated transducer electrodes are included in the simulation for direct excitation of a ring resonator and critical coupling between microwave input and phononic dissipation. Our work provides a comprehensive numerical characterization of phonon modes and functional phononic components in high-acoustic-index phononic circuits, which supplements previous theories and contributes to the emerging field of phononic integrated circuits.
A biodegradable artificial synapse implemented by foundry-compatible materials
Authors: Zhong Shuai , Ji Xinglong , Hao Song , Liu Faqiang , Zhao Rong
Published: November 2020

Neuromorphic computing has attracted increasing attention in medical applications due to its ability to improve diagnosis accuracy and human healthcare monitoring. However, the current remote operation mode has a time delay between in vivo data acquisition and in vitro clinical decision-making. Thus, it is of great importance to build a biodegradable neuromorphic network that can operate in a local physiological environment. A biodegradable synapse is a crucial component of such neuromorphic networks. However, the materials employed currently to develop a biodegradable synapse are incompatible with the foundry process, making it challenging to achieve a high density and large-scale neuromorphic network. Here, we report a biodegradable artificial synapse based on a W/Cu/WO3/SiO2/W structure, which is constructed from materials widely used in advanced semiconductor foundries. The device exhibits resistive switching, and the dominated mechanisms are attributed to Ohm's law and trap-filled space charge limited conduction. By manipulating pulse amplitudes, widths, and intervals, the device conductance can be finely regulated to achieve various synaptic functions, such as long-term potentiation, long term depression, paired-pulse facilitation, and spike-rate-dependent plasticity. Moreover, the learning-forgetting-relearning process, which is an essential and complex synaptic behavior, is emulated in a single device. Pattern learning of a slash symbol is also accomplished by building a 4 × 4 synaptic array. In addition, the systematic solubility testing proves its full biodegradability in biofluids. This work opens a potential pathway toward the integration of large-scale neuromorphic network for bioelectronics.
Riemann problem for the 2D scalar conservation law involving linear fluxes with discontinuous coefficients
Authors: Cheng Hongjun , Yang Hanchun
Published: November 2020

This paper is devoted to the four-constant Riemann problem for the two-dimensional (2D) scalar conservation laws involving linear fluxes with discontinuous coefficients. First, under the assumption that each discontinuity ray of initial data outside of the origin emits exactly one elementary wave, by studying the pointwise interactions occurring at the interaction points of waves, we completely solve this Riemann problem in the self-similar plane with 21 nontrivial and different geometric structures. Second, when each discontinuity ray of initial data outside of the origin emits two different kinds of contact discontinuities, by studying the pointwise interactions, we construct an interesting kind of spiral structure in the self-similar plane.
Influence of ALD Ru bottom electrode on ferroelectric properties of Hf0.5Zr0.5O2-based capacitors
Authors: Chernikova Anna G. , Kozodaev Maxim G. , Khakimov Roman R. , Polyakov Sergey N. , Markeev A. M.
Published: November 2020

We report the influence of an ultrathin Ru bottom electrode on ferroelectric properties of fully atomic layer deposition (ALD)-grown Hf0.5Zr0.5O2 (HZO) and La-doped Hf0.5Zr0.5O2 (HZLO)-based ferroelectric capacitors. We show that the Ru bottom electrode deposited by radical enhanced ALD (REALD) improves the remanent polarization of both capacitors considerably. The origin of such a phenomenon is established by grazing-incidence and symmetrical θ–2θ x-ray diffraction measurements. HZO films on Ru exhibit the orthorhombic phase, which is highly (002)-textured in the out-of-plane direction as compared to HZO on TiN. HZLO films demonstrate the rise of (111) intensity of the orthorhombic phase when it is grown on Ru. Both types of capacitors with Ru exhibit a lower wake-up degree as compared to the ones with TiN, which is assumed to be due to the difference in the bottom interface properties. At the same time, both HZO and HZLO on Ru suffer from the relatively early breakdown during electric field cycling, which is presumably due to the high surface roughness of REALD Ru. Taking into account the continuous search for the new precursor's chemicals and ALD processes for Ru, which would be able to provide smother films, ALD Ru might be promising for the hafnium oxide-based ferroelectric random access memory.
Empirical method for modeling crystal lattice parameters of A2XY6 cubic crystals using grid search-based extreme learning machine
Authors: Ibn Shamsah Sami M. , Owolabi Taoreed O.
Published: November 2020

The lattice parameters of A2XY6 (A = K, Cs, Rb, and Tl; X = tetravalent cation; Y = F, Cl, Br, and I) cubic crystals play significant roles in designing materials for specific technological applications and uniquely describe the material crystal structure. Despite the importance of its lattice parameters, the experimental determination of these parameters requires special sophisticated equipment, while the first principle calculation consumes appreciable time and might need complex software packages. The existing empirical relation in the literature is characterized by large percentage deviation, and the recently proposed machine learning support vector regression method cannot be empirically implemented on new compounds. This present work fills the research gap through the development of empirical relation between the lattice parameters, electronegativity and ionic radii of the constituting ions using extreme learning machine (ELM) with the grid search (GS) hyper-parameters optimization method. The proposed model is developed through the analysis of atomic structural properties of 85 crystals that serve as representatives of the A2XY6 group. On the basis of a mean absolute percentage error, the developed GS-ELM model outperforms the existing Brik and Kityk [J. Phys. Chem. Solids 72(11), 1256–1260 (2011)] model with a percentage improvement of 58.37%, while it performs better than Alade et al. [J. Appl. Phys. 127(1), 15303 (2020)] model with the percentage enhancement of 37.90%. The outstanding performance of the proposed GS-ELM model coupled with its ease of implementation would be of great significance by enhancing the search for new materials tailored to targeted application and preventing lattice constant mismatch in thin film fabrication.
The effects of proton tunneling, 14N quadrupole coupling, and methyl internal rotations in the microwave spectrum of ethyl methyl amine
Authors: Koziol Kenneth J. , Stahl Wolfgang , Nguyen Ha Vinh Lam
Published: November 2020

The spectra of N-ethyl methyl amine, CH3(NH)CH2CH3, were measured using a molecular jet Fourier transform microwave spectrometer in the frequency range of 2 GHz–26.5 GHz. Splittings due to proton inversion tunneling, Coriolis coupling, 14N quadrupole coupling, and methyl internal rotation were fully resolved. The experimentally deduced rotational constants are A = 25 934.717(21) MHz, B = 3919.8212(23) MHz, and C = 3669.530(21) MHz. The proton tunneling causes (+) ↔ (−) splittings of about 1980.9 MHz for all c-type transitions between the lowest symmetric and the higher anti-symmetric energy levels. The splittings of the (+) ← (+) and (−) ← (−) levels, mainly influenced by Coriolis coupling, were also observed and assigned for b-type transitions, yielding the coupling constants Fbc = 0.3409(71) MHz and Fac = 163.9(14) MHz. The 14N quadrupole coupling constants were determined to be χaa = 2.788 65(55) MHz and χbb − χcc = 4.630 45(91) MHz. Fine splittings arising from two inequivalent methyl rotors are in the order of 150 kHz, and the torsional barriers are determined to be 1084.62(41) cm−1 for the CH3NH methyl group and 1163.43(80) cm−1 for the CH2CH3 methyl group. The experimental results are in good agreement with those of quantum chemical calculations.
Effect of charge convection on gravitational settling of drop in uniform electric field
Authors: Behera Nalinikanta , Chakraborty Suman
Published: November 2020

Dynamics of droplets in an electrified medium is largely dictated by an intricate interplay between interfacial charge convection and Ohmic conduction within the bulk. The extent of this interaction is quantified by the electric Reynolds number, ReE, delineating their relative strengths. The reported asymptotic theories consider vanishingly low values of ReE, i.e., negligible surface charge convection as compared to the bulk Ohmic conduction, which, in turn, enables decoupling of the contributions of drop deformation and charge convection. This, however, is grossly inaccurate toward establishing an appropriate inter-connection between surface charge convection and morpho-dynamic evolution of the drop beyond such limiting conditions. Circumventing these limits, here we present a theoretical approach that is capable of bringing out the underlying physics beyond low ReE limits. We realize this by incorporating nonlinear charge-convection effects in the leading-order and first-order problem. The present analytical model not only predicts the drop speed accurately but also shows noticeable improvement over the predictive capabilities of the existing asymptotic models. Our results demonstrate that convection of charges can lead to a substantial increase or decrease in gravitational settling speed, depending on the relative electrical properties of the droplet and the carrier. In sharp contrast to previously reported findings, we show that sufficiently strong charge convection can overwhelm the effect of deformation and hence can reverse the trends in the settling speed reported earlier. Comparison with results from full-scale numerical simulations justifies the accuracy of our analytical approach up to a fair level of high asymmetric deformation.
Co-alloying effects on the site preference and the elastic properties of γ′-Ni3Al from first-principles calculations
Authors: Hao Luyao , Guo Jiachen , Lei Xiaowei , Yao Wenjing , Wang Nan
Published: November 2020

The influences of co-alloying atom pairs Ta–X (X: Ta, Mo, W, Cr, Co, and Re) on the site preference and elastic properties of γ′-Ni3Al precipitate phase were studied using first-principles calculations, and the underlying mechanism for the strengthening effect is determined. It is found that the site preferences of Ta–X co-alloying atom pairs are in the sequence of Al–Al, Al–Ni, Ni–Al, and Ni–Ni sites except for Ta–Co. The atom pair Ta–Co does not display a strong site preference tendency. The elastic properties for the Al–Al configuration were examined, and the results were compared with those of single-alloying to investigate the co-alloying effect. It is shown that the elastic modulus and hardness are obviously improved by co-alloying. Moreover, the effect of co-alloying is stronger than that of single-alloying. The further analyses by the charge density difference and the electronic density of states reveal that the strong effect of the co-alloying is attributed to the enrichment of the charge density between X and its nearest-neighbor Ni, as well as the orbital hybridization between Ta/X-d and Ni-d which acts as covalentlike bonds. Our results can provide an in-depth insight into the physics in the strengthening effect of co-alloying elements on the mechanical properties of single crystal superalloys.
Metal–insulator switching of vanadium dioxide for controlling spin-wave dynamics in magnonic crystals
Authors: Nikitin Aleksei A. , Nikitin Andrey A. , Ustinov Alexey B. , Komlev Andrey E. , Lähderanta Erkki , Kalinikos Boris A.
Published: November 2020

The present work focuses on the effect of vanadium dioxide (VO2) films exhibiting a metal–insulator transition (MIT) on the performance characteristics of the magnetic multilayers. It has been shown that the MIT provides a novel mechanism for controlling the microwave spin-wave dynamics in the yttrium iron garnet (YIG) films. In particular, the low and high levels of microwave attenuation of spin waves transmitted through the YIG–VO2 bilayer has been observed due to a variation of the VO2 conductivity within a narrow temperature range. This effect has been utilized to realize fully reconfigurable magnonic crystals composed of the thickness-modulated YIG and regular VO2 films. A promising functionality of the proposed waveguiding structures arises from a controllability of wave intensity, which provides an altering of the frequency response from an original band structure to a full rejection of spin waves. Numerical simulations taking into account both the YIG film saturation magnetization and the VO2 film conductivity have confirmed the experimentally observed spin-wave dynamics. An interest in ferrite–VO2 bilayers arises not only from possible practical applications but also from a variety of fundamental scientific problems devoted to the physics of wave phenomena in planar thin-film magnetic multilayers.
Redescription of Amphioctopus ovulum (Sasaki, 1917) (Cephalopoda : Octopodidae) and comparative morphological analyses among three species of violet-ringed octopods
Authors: Tang Yan , Zheng Xiaodong , Li Qi
Published: November 2020

Amphioctopus ovulum (Sasaki, 1917) is a small to moderate-sized octopus, which can be identified by the iridescent violet ring present in the dark ocellus on the web between the bases of arms II and III. Comprehensive taxonomic review is required to fully characterise this species because the syntypes are missing and the description is insufficiently complete for modern octopod taxonomy. In this study, the species A. ovulum is redescribed with morphological and morphometric characters of 18 specimens collected from the coastal waters of China. The distribution of A. ovulum extends from the Gulf of Thailand, through Cambodia, Vietnam, Philippines, through the South China Sea and the East China Sea to Japan. The swollen terminal organ diverticulum and long spermatophores make it possible to distinguish A. ovulum clearly from A. rex and A. neglectus, species with similar morphological characters of violet rings. Moreover, three species of violet-ringed octopods were clearly differentiated by sequences of the partial mitochondrial genes COI and COIII. Three monophyletic clades resolved in phylogenetic trees. Amphioctopus rex and A. neglectus clustered into a sister taxon, and clustered with the remaining Amphioctopus species.
Trends and environmental drivers of giant catfish catch in the lower Amazon River
Authors: Cruz R. E. A. , Kaplan D. A. , Santos P. B. , Ávila-da-Silva A. O. , Marques E. E. , Isaac V. J.
Published: November 2020

The giant catfishes Brachyplatystoma rousseauxii, Brachyplatystoma vaillantii and Brachyplatystoma filamentosum are important environmental, social and economic resources in the Amazon. However, anthropogenic environmental changes, such as climate change, deforestation, overexploitation of water resources and damming of rivers, threaten the conservation of this fishery. The aims of this study were to investigate temporal trends and elucidate global and regional environmental drivers of catch for these species of giant catfish in the Amazon. Using annualised catch data (1993–2010), we tested for linear trends using Mann–Kendall tests and built multilinear models of fish catch using effort and a variety of regional and global hydrological and meteorological series. We found a significant decline in the catches of B. rousseauxii and B. filamentosum, whereas the B. vaillantii catch increased. Total catch had a significant positive correlation with fishing effort, and variation in sea surface temperature (SST) explained an additional 19–38% of the variability of catches. Other hydrological and climate variables were weakly correlated or uncorrelated with catch. Overall, these results argue strongly for a resumption the collection of fishing statistics in the Amazon. In addition, associations between SST and catch suggest that conservation of these long-distance migrants must consider both regional and global drivers of fisheries change.
Red deer allocate vigilance differently in response to spatio-temporal patterns of risk from human hunters and wolves
Authors: Proudman Nathan J. , Churski Marcin , Bubnicki Jakub W. , Nilsson Jan-Åke , Kuijper Dries P. J.
Published: November 2020

Abstract
ContextUngulate prey can use increased vigilance to reduce their risk of predation, but little is known of the combined and interactive risk effects from humans and wolves in determining ungulate behaviour across time and space. Understanding the interplay between these risk effects is increasingly important, considering the recolonisation of several large carnivores to more human-dominated landscapes in Europe.
AimThe aim of the present study was to assess the vigilance behaviour expressed by red deer (Cervus elaphus) in response to both humans and wolves in the Polish Białowieża Forest.
MethodsUsing a camera-trap transect, the effect of distance to human settlements, hunting season, patterns of space use by wolves (Canis lupus), canopy openness, canopy height, time of day, as well as sex/age of individuals, on the vigilance behaviour observed in red deer was studied using a model-selection approach.
Key resultsWe did not find a clear effect of patterns of space use by wolves or distance to human settlements on red deer vigilance behaviour at the landscape scale. However, red deer showed increased vigilance during the hunting season and during the day outside of protected areas and reserves, because disturbance from human hunters is highest. Conversely, we also found that red deer were more vigilant at night within more protected areas, which is likely to be explained by the increased activity of wolves because human activity is strictly limited.
ConclusionsOur study showed that vigilance behaviour of red deer in Białowieża Primeval Forest is more driven by human hunting than by the frequency of wolf presence at a landscape scale. This could be explained by the higher temporal and spatial predictability of human hunting activities than wolf risk. We found that patterns of wolf space use, as opposed to the omnipresent fear effects from humans, had only localised effects by increasing vigilance levels during night hours in non-hunting areas of the forest. The reverse was observed outside of protected reserves. Understanding how prey species respond to this new combination of risk from natural predators and humans, is increasingly important in a landscape where human risk is becoming ever more potent and carnivores recolonise.
Thematic adverbial adjuncts of place and direction and their relationship
to conceptual metaphor in A. E. Housman’s A Shropshire Lad
Authors: Goatly Andrew
Published: November 2020

Systemic Functional Grammar (SFG), in discussing the textual metafunction of grammar, identifies any sentence element other than Subject in initial position in declarative clauses as “marked Theme”. Previous research analysed the use of marked Theme in A. E. Housman’s poem sequence A Shropshire Lad (Goatly 2008), revealing the importance of space, place, orientation and direction. These semantic fields have been identified as significant sources for conceptual metaphors, and this chapter re-examines the widespread use of place and direction adjuncts in marked thematic position for their symbolic significance. By analysing in detail ten of the poems in which marked Theme is particularly prominent, it demonstrates that they do indeed achieve symbolic value, and that their symbolism is dependent upon the conceptual metaphors/metaphor themes identified in and catalogued in Metalude (Goatly 2002-2005). One can conclude that, though apparently backgrounded by being positioned in Theme position, these adjuncts are, in fact, of importance to literary theme.
Death by nature in two poems by Alden Nowlan
Authors: Lahey Ernestine
Published: November 2020

This chapter provides a Text World Theory analysis of two poems by the Canadian poet Alden Nowlan, specifically focusing on the “death by landscape” trope (Atwood 1972) in these works. I argue that Nowlan, often viewed as a regionalist poet, draws on a wilderness-based model of Canadian identity that clearly aligns his work with deeply-felt national concerns. The analysis provided here extends earlier considerations of text-world landscape construction in poetry (e.g. Lahey 2006), thus contributing to the development of a Text World Theory that is more sensitive to literary landscape representation.