bluuebunny/crossref_metadata_2025_split huggingface dataset:
Determinants and Management of the Post–Pulmonary Embolism Syndrome
Authors: Boon Gudula J.A.M. , Huisman Menno V. , Klok Frederikus A. 
Published: February 2021

AbstractAcute pulmonary embolism (PE) is not only a serious and potentially life-threatening disease in the acute phase, in recent years it has become evident that it may also have a major impact on a patient's daily life in the long run. Persistent dyspnea and impaired functional status are common, occurring in up to 50% of PE survivors, and have been termed the post-PE syndrome (PPES). Chronic thromboembolic pulmonary hypertension is the most feared cause of post-PE dyspnea. When pulmonary hypertension is ruled out, cardiopulmonary exercise testing can play a central role in investigating the potential causes of persistent symptoms, including chronic thromboembolic pulmonary disease or other cardiopulmonary conditions. Alternatively, it is important to realize that post-PE cardiac impairment or post-PE functional limitations, including deconditioning, are present in a large proportion of patients. Health-related quality of life is strongly influenced by PPES, which emphasizes the importance of persistent limitations after an episode of acute PE. In this review, physiological determinants and the diagnostic management of persistent dyspnea after acute PE are elucidated.
Prevention of Venous Thromboembolism in Acutely Ill Medical Patients: A New Era
Authors: MacDougall Kira , Spyropoulos Alex C. 
Published: February 2021

AbstractVenous thromboembolism (VTE) is the leading preventable cause of death in hospitalized patients and data consistently show that acutely ill medical patients remain at increased risk for VTE-related morbidity and mortality in the post-hospital discharge period. Prescribing extended thromboprophylaxis for up to 45 days following an acute hospitalization in key patient subgroups that include more than one-quarter of hospitalized medically-ill patients represents a paradigm shift in the way hospital-based physicians think about VTE prevention. Advances in the field of primary thromboprophylaxis in acutely-ill medical patients using validated VTE and bleeding risk assessment models have established key patient subgroups at high risk of VTE and low risk of bleeding that may benefit from both in-hospital and extended thromboprophylaxis. The direct oral anticoagulants betrixaban and rivaroxaban are now U.S. Food and Drug Administration-approved for in-hospital and extended thromboprophylaxis in medically ill patients and provide net clinical benefit in these key subgroups. Coronavirus disease-2019 may predispose patients to VTE due to excessive inflammation, platelet activation, endothelial dysfunction, and hemostasis. The optimum preventive strategy for these patients requires further investigation. This article aims to review the latest concepts in predicting and preventing VTE and discuss the new era of extended thromboprophylaxis in hospitalized medically ill patients.
Jahn–Teller distortions in (Co1–xCux)Cr2O4 (x = 0.5, 0.25) nanoparticles: Structural, magnetic and electronic properties
Authors: Mohanty P. , Sheppard C. J. , Doyle B. P. , Carleschi E. , Prinsloo A. R. E. 
Published: February 2021

The spinel ferrimagnetic compound CoCr2O4 demonstrates a spin spiral (TS) ordering at 25 K, as well as an anomaly at 15 K termed as lock-in transition (TL). From crystallographic perspective CoCr2O4 retains the cubic phase down to 11 K. On the other hand, the normal spinel CuCr2O4 crystallizes into the cubic phase above 850 K, below which Jahn-Teller (J-T) activity of the Cu reduces the crystal symmetry by transforming it to a tetragonal phase. Contraction of CuO4 tetrahedra towards the formation of a square planar structure accounts for the tetragonal to orthorhombic structural transition at ∼ 130 K associated with the ferrimagnetic Curie temperature (TC). Considering the differences in crystal structure and magnetism of these two compounds, the current work investigates the modification in crystal structure and magnetic behaviour by mixing Co site with Cu in CoCr2O4. To achieve this, (Co1–xCux)Cr2O4 (x = 0.5, 0.25 and 0.75) nanoparticles were prepared by chemical routes. X-ray diffraction (XRD) revealed the retention of cubic structure for the samples calcined at a temperature of 600 °C for x = 0.25 and 0.5. On the other hand, J-T distortion becomes prominent for x = 0.75. Hence, only the compositions with x = 0.25 and 0.5 were studied in detail as unusual cubic phase retention is observed in these compounds. The temperature dependent magnetization studies revealed that the TC values of both the samples, 103 K for (Co0.5Cu0.5)Cr2O4 and 99 K for (Co0.75Cu0.25)Cr2O4, compare well with the value reported for CoCr2O4. However, the feature related to TS is quite prominent for x = 0.25, whereas it is suppressed for x = 0.5. The electronic properties of the cations associated with these compounds, probed using X-ray photoelectron spectroscopy (XPS), indicate that Cu and Co mostly has a 2+ oxidation state whereas that of Cr is 3+.
Neural correlates of goal-directed and non–goal-directed movements
Authors: Sendhilnathan Naveen , Basu Debaleena , Goldberg Michael E. , Schall Jeffrey D. , Murthy Aditya 
Published: February 2021

Significance
Although the monkey frontal eye field is implicated in the voluntary control of saccades, we found that only for during goal-directed saccades the variability in spike rate across trials decreased and had a concurrent reduction of LFP beta-band power, and the neural activity increased earlier. These data indicate the presence of additional constraints and computations that distinguish goal-directed movements from non–goal-directed movements.
Collective dynamics in entangled worm and robot blobs
Authors: Ozkan-Aydin Yasemin , Goldman Daniel I. , Bhamla M. Saad 
Published: February 2021

Significance
Living organisms form collectives across all scales, enabling biological functions not accessible by individuals alone. In a few cases, the individuals are physically connected to each other, forming an additional class of entangled active matter systems with emergent mechanofunctionalities of the collective. Here, we describe the dynamics of macroscopic aquatic worms that braid their long, soft bodies to form large entangled worm blobs. We discover that the worm blob behaves as a living material to undergo dynamic shape transformations to reduce evaporation or break-symmetry and locomote to safety against thermal stresses. We validate our biological hypotheses in robophysical swarming blobs, which pave the way for additional classes of mechanofunctional active matter systems and collective emergent robotics.
Ancient DNA and multimethod dating confirm the late arrival of anatomically modern humans in southern China
Authors: Sun Xue-feng , Wen Shao-qing , Lu Cheng-qiu , Zhou Bo-yan , Curnoe Darren , Lu Hua-yu , Li Hong-chun , Wang Wei , Cheng Hai , Yi Shuang-wen , Jia Xin , Du Pan-xin , Xu Xing-hua , Lu Yi-ming , Lu Ying , Zheng Hong-xiang , Zhang Hong , Sun Chang , Wei Lan-hai , Han Fei , Huang Juan , Edwards R. Lawrence , Jin Li , Li Hui 
Published: February 2021

Significance
Genetic studies show the founders of all living non-African populations expanded from Africa ca. 65 to 45 ka. This “late dispersal” model has been challenged by the discovery of isolated AMHs at caves in southern China suggested as early as ca. 120 ka. We assessed the age of early AMH fossils from five caves in this region using ancient DNA analysis and a multimethod geological dating strategy. We found they were much younger than previously suggested, with some remains dating to the Holocene owing to the complex depositional history at these subtropical caves. Current evidence shows AMHs settled southern China within the timeframe set by molecular data of less than ca. 50 to 45 ka and no earlier.
Another argument for the differences among
wa-marked phrases
Authors: Nakamura Koichiro 
Published: February 2021

Abstract
The aim of this paper is to argue that the focal
stress and structural position determine the interpretation of
wa-marked phrases in a Japanese sentence.
Namely, our argument is, based on, and extended out of Nakamura
(2017: 356–359), that in sentence initial position,
wa-marked phrases denote Thematic Topic
(tt) or Contrastive Topic (ct). Besides, our
claim is that within vP domain, focally-stressed
wa-marked phrase, denoted here as
wa-marked phrase, signals Contrastive Focus (cf).
In (1a),
wa-marked phrase denotes exhaustivity. On the other
hand, wa-marked phrase in (1b), which occurs below the VP
adverb majimeni (=seriously), signals contrast.

(1)

Iya,
demo
ano-ronbun-wa

Taro-ga
yon-da
(yo).

no,

but

that paper-ei Focus

T-Nom

read-Past

Par

‘Not, but Taro read that
paper, and he read nothing more.’

Majimeni
Taro-wa
hon-4-satu-wa

yon-da

seriously

t-tt

book-4-cl-cf

read-Past

‘Taro seriously read the
four books (, opposed to four papers).

Through the examples of the scopal interactions
between negation, verbs and focus particles and wa-marked
phrases, we demonstrate that the wa-marked phrase in
vP domain denotes contrastive focus
(cf). We go on to propose the following elaborated left
peripheries for both CP and vP territories.

(2)

[TopP
[FocP [TopP [TP [
vP [VP ….]]]]]:
CP periphery

[TopP
[FocP [TopP [
vP [VP ….]]]]:
vP periphery
Properties of child-directed speech in bilingual parents
Authors: Li Yezhou , Onnis Luca 
Published: February 2021

Abstract
How parents talk to young children matters to language and cognitive development. In the early years the quantity,
quality, and diversity inherent in language from parents in the home predict differences in vocabulary knowledge, school
readiness, and later academic achievement. However, most of what is known about child-directed speech (CDS) comes from studies of
monolingual parents, and little is known about features of speech from bilingual parents. Here, we asked whether degree of
bilingualism assessed within a single parent might be positively associated with CDS features that are known to facilitate
children’s lexical and grammatical structures across languages – parental partial repetitions. During unscripted narrations
(n = 91) of a picture book to their toddlers in English, mothers who reported being more bilingually balanced
used a higher proportion of self-repetitions (both single words and 2-word combinations) within a brief time-frame. At the same
time, more bilingual mothers preserved the same degree of lexical diversity as more monolingual mothers. The results obtained even
accounting for differences in socio-economic status. These findings are discussed in terms of adaptive strategies that bilingual
parents may consciously or unconsciously adopt in bilingual language development
Change and continuity in Hurstville’s Chinese restaurants
Authors: Xu Samantha Zhan , Wang Wei 
Published: February 2021

Abstract
This paper investigates the Linguistic Landscape of Chinese restaurants in Hurstville, a Chinese-concentrated suburb in Sydney, Australia. It draws on Blommaert and Maly’s (2016) Ethnographic Linguistic Landscape Analysis (ELLA) and Scollon and Scollon’s geosemiotics (2003). Our data set consists of photographs, Google Street View archives, and ethnographic fieldwork, in particular in-depth interviews with restaurant owners. This paper adopts a diachronic perspective to compare the restaurant scape between 2009 and 2019 and presents an ELLA case study of a long-standing Chinese restaurant. It aims to unveil the temporal and spatial relationships between signs, agents, and place, that demonstrate how a social and historical perspective in Linguistic Landscape studies of diasporic communities can shed light on the changes in the broader social context.
Performance evaluation of free space optical link by incorporating the device parameters of quantum cascade laser based transmitter
Authors: Ashok P , Madhan M Ganesh , Natraj N A 
Published: February 2021

Abstract
This article investigates the performance of a free space optical (FSO) communication link by incorporating the device parameters that influence the optical output power of the quantum cascade laser (QCL). The transmitter side of the FSO link consists of gain-switched QCL operating at 9 µm. Short optical pulses possessing minimum full width half maximum (FWHM) and peak power as a result of ON-OFF keying are transmitted into the channel. The pulses are attenuated by medium bound losses and reach the receiver which employs quantum well infrared photodetector operating in the same wavelength. Average signal-to-noise ratio (SNRavg), bit error rate (BER) and Channel Capacity are computed for the FSO link for all the variations in the device parameters namely optical confinement factor (Γ), spontaneous emission factor (β) and mirror reflectivity (R). The combination of device parameters that gives the best link performance is assessed. From the analysis it is observed that, under minimum FWHM condition, QCL with Γ = 0.32 provides the best average SNR of 4.04 dB, lowest BER of 13.02 × 10−2 and maximum capacity of 1.82 bps Hz−1. When peak power is the constraint, QCL with mirror reflectivity of Γ = 0.45 provides the best average SNR of 24.78 dB, lowest BER of 7.75 × 10−35 and a peak capacity of 8.24 bps Hz−1.
Optical properties of ZnO:SiO2:Tb3+films: the effect of DNA
Authors: Boruleva E A , Chudinova G K , Hayrullina I A , Nagovitsyn I A , Khoroshilov A V , Lobanov A V 
Published: February 2021

AbstractThin films of zinc oxide and those doped with terbium (at concentrations of 0.1–5.0 mol%) were synthesized on glass substrates using the sol–gel method. The UV–Vis transmission spectra showed that transparency increases from 60% to 86% with an increase of Tb content. All terbium-doped samples exhibit a rise in Eg from 3.37 eV for zinc oxide to 3.827 eV for doped films. The photoluminescence (PL) of zinc oxide doped with terbium in the UV (260 nm) region and the fluorescence of terbium in the visible region (330 nm) were studied. The intensity of green luminescence with an increase in the amount of terbium increases by an average of 6%. The yield of green fluorescence relative to PL also goes up with an increase in the concentration of terbium concentration of terbium from 5% to 7.4%. DNA deposited on the surface of the plate extinguishes PL by an average of 5.5% and has a weak effect (<3%) on terbium fluorescence in the visible region. SEM images without DNA consist of spherical structures—0.5–2.0μm in diameter, assembled in the form of pentagons. The presence of DNA on the surface is expressed as ‘stars’ of white color of regular and irregular shapes, located on the surface inside these pentagons.
Nucleon-pair approximation with uncoupled representation *
Authors: Lei Y. , Lu Y. , Zhao Y. M. 
Published: February 2021

Abstract
In this paper, we propose an approach to nucleon-pair approximation (NPA) with m-scheme bases, in which the collective nucleon pairs are represented in terms of antisymmetric matrices, and commutations between nucleon pairs are given using a matrix multiplication that avoids angular-momentum couplings and recouplings. Therefore the present approach significantly simplifies the NPA computation. Furthermore, it is formulated on the same footing with and without isospin.
Development of plasma technology for metal powders used in additive technologies
Authors: Kadyrov A A , Yushin B A , Frolov V Ya 
Published: February 2021

Abstract
The article describes the main characteristics of plasma technology designed for the production of metal powders, such as voltage, current, plasma-forming gas flow rate, plasma flow temperature. Based on experimental data and theoretical calculations, mathematical models are constructed to refine the defining characteristics, as well as to visualize the process. The mathematical model contains a spray chamber, an electrode rotation mechanism, a gas mixture supply unit, a plasma heating source, and a water cooling system for the chamber walls. The method of a rotating electrode with plasma heating (PREP) was used.
Design and modelling of a universal CNC machine
Authors: Rastvorova I I , Klyucherev N A 
Published: February 2021

Abstract
This paper proposes a method of designing an affordable, universal Computer Numerically Controlled (CNC) machine for the use by hobbyists and university laboratories. The machine combines the functions of a 3 to 4-axis milling machine and of a 3D printer. We discuss the major factors contributing to manufacturability and dimensional accuracy of the produced parts, and make several suggestions that aim to maximize the cost effectiveness of the machine’s design. A methodology is developed for optimizing the machine’s rigidity and dimensional accuracy by selecting the proper off-the-shelf components. A calculation that follows the proposed method starts when the required level of accuracy and the machining speed is specified; the result of such a calculation is the overall design of the CNC machine, a bill of materials, and the cost estimate. The design can be optimized for cost, weight, or other parameters. The model presently accounts for the forces generated by the cutting action, the acceleration of machine components, and the associated simple bending moments. The future work in this area relates to the improvement of the proposed method and mathematical model to account for the twisting moments, friction, and vibration.
Acoustically induced mass transfer in saturated porous media
Authors: Izmaylova G R 
Published: February 2021

Abstract
The paper provides a physical rationale for acoustic flows to occur in porous saturated media. A formula is derived for calculating the velocities of these flows, assuming that all acoustic energy is converted to create flows in a formation. It is assumed that the velocity of acoustic flows depends on the acoustic intensity and the fluid viscosity that saturates pore spaces. With increased fluid viscosity, acoustic velocity decreases. An experimental framework is presented for the effect of combined acoustic and constant electric fields on the permeability of a saturated porous medium.
Forming small junctions with reduced defectiveness
Authors: Mustafaev G A , Khasanov A I , Mustafaev A G 
Published: February 2021

Abstract
This paper is dedicated to studying possibilities of forming small junctions with reduced defectiveness. As horizontal dimensions of devices in VLSIs diminishes, the task of reducing their vertical dimension becomes more pressing. Due to that, the task of producing small p+n junctions for CMOS structures by means of boron implantation becomes ever more important; the projected path of boron ions is significantly longer than those of n-type conductivity dopants. Using ion implantation for this purpose at low energy is not a good idea, as the depth of junction is largely determined by channeling effects in monocrystalline substrates. Ion implantation in substrate covered with amorphous films of SiO2 or Si3N4 does not remove the phenomenon of channeling completely. Nitrogen and oxygen atoms being trapped in the substrate from the amorphous films may result in degradation of characteristics of produced devices. Besides the channeling effects, the processes of dopant redistribution during annealing may also significantly affect the depth of the junctions.
Research on Intelligent Assembly Modes of Aerospace Products Based on Digital Twin
Authors: Shi Li , Yan Liang , Shuqing Bai , Cuobo Zhuang , Yuanchong Cao 
Published: February 2021

Abstract
Based on the multi-varieties and scalable batch production mixed line assembly of aerospace products, this paper proposes the technical approach and system architecture of an intelligent assembly integration platform which is composed of hardware layer, software layer and application layer from bottom up, so as to construct an intelligent assembly integration application platform based on the digital twin. Hardware layer is composed of the equipment and communication, software layer mainly includes the database and functional modules, and application layer is constructed based on a digital twin model, realizing visual monitoring of the assembly process. This paper establishes an intelligent monitoring mode based on digital twin and an intelligent control mode based on two-layer optimization. At the workshop layer, a digital twin mode of entities is constructed so as to form a plan optimization information, logistics optimization information and quality optimization information, and post control optimized execution information is sent back to the workshop operational layer. At the assemble line layer, real-time information is acquired, equipment monitoring is realized, and optimized information is sent back to the workshop operational layer, achieving control and optimization of assembly lines. This paper reshapes processes under this intelligent assembly mode; and verify its application in aerospace product assembly.
A Sales Prediction Method Based on LSTM with Hyper-Parameter Search
Authors: Dai Yun , Huang Jinghao 
Published: February 2021

Abstract
Sales forecast is a significant topic in business operation, which generally formulated as a time-series regression problem. Although there are many research results in this field, we still face some challenges in real scenes, such as data with high-sparsity, users may have a preference in prediction results, and systems need a single model with high performance. In this paper, a method is proposed to address the above challenges. We present a long short-time memory (LSTM) model with a special loss function and use the hyper-parameter search for accuracy optimization. To illustrate the performance, we employ them on the open dataset, Kaggle Rossman sales data. The experiment results show that compare with a series of machine learning models using the AutoML (Auto Machine Learning) tool, the proposed method significantly increased the performance of prediction on sparse data. Besides, it can reasonably overestimate or underestimate sales forecasts based on user preferences that meet the actual business demands.
Decision Support System in Detrmination of Project Tender Winner Using the Analytical Hierarchy Process (AHP) Method
Authors: Annas Firdaus , Ediana Dina , Kurniawan Asep , Wandira Raju , Zakir Supratman 
Published: February 2021

Abstract
Decision Support System (DSS) is a system that can help someone in making accurate and targeted decisions. Many problems can be solved by using DSS, one of which is the determination in the winner of the project tender. There are several methods that can be used in building a DSS, including Analytic Hierarchy Process (AHP). AHP is the most widely used method in solving multi-criteria problems, such as in determining the winner of a project tender. This study uses the AHP method in determining the winner of a project tender in the Procurement Services Unit (ULP) IAIN Bukittinggi. In determining the winner of a tender, there are several criteria that form the basis of decision making including administrative evaluation, technical evaluation, price evaluation and qualification evaluation. From the four criteria, it is processed according to alternative data, namely bidders. The application used in determining the winner of this tender is the Expert Choice software. The final results in this study are the results of global priority criteria that are sorted from highest to lowest, so that the committee can determine the winner of the tender.
The Validity and Practicality of Augmented Reality Based Learning Media for Computer Basics Courses
Authors: Anugrah Septriyan 
Published: February 2021

Abstract
“Augmented Reality is a technology that gets a lot of attention because it can combine text and image media into its world with these advantages Augmented reality is expected to be a solution in the need for learning media in this study will reveal the validity and practicality of augmented reality-based learning media with research subject students majoring in technology curriculum in the field of education at Padang State University with the results of the study showing that augmented reality based media is valid and practical for lecturers and students