bluuebunny/crossref_metadata_2025_split huggingface dataset:
Methylenetetrahydrofolate reductase gene polymorphisms in the risk of polycystic ovary syndrome and ovarian cancer
Authors: Xiong Ying , Bian Ce , Lin Xiaojuan , Wang Xiaoli , Xu Kehui , Zhao Xia 
Published: July 2020

Abstract
Polymorphisms of methylenetetrahydrofolate reductase (MTHFR) in hormone metabolism pathways might cause metabolic disturbances and contribute to the development of polycystic ovary syndrome (PCOS) and ovarian cancer, but the published studies were inconsistent. The aim of the present study was to evaluate the MTHFR C677T (rs1801133) and A1298C (rs1801131) gene polymorphisms in the risk of PCOS and ovarian cancer by meta-analysis. A comprehensive electronic search was conducted in databases for studies published from 1995 to 2020. The pooled ORs were calculated by Revman 5.2 software. Twenty-nine articles including 45 case–control studies were included. We found that MTHFR C677T polymorphisms were correlated with elevated PCOS risk (TT vs. CT+CC: OR = 1.41, 95%CI = 1.20–1.67; TT+CT vs. CC: OR = 1.54, 95%CI = 1.07–2.22; CT vs. CC+TT: OR = 1.18, 95%CI 1.04–1.33; TT vs. CC: OR = 1.47, 95%CI = 1.03–2.11; T vs. C: OR = 1.25, 95%CI = 1.06–1.47), which were more obvious in Middle Eastern subgroup. MTHFR A1298C polymorphisms were also associated with overall PCOS susceptibility (CC vs. AC+AA: OR = 2.55, 95% CI = 1.61–4.03; CC+AC vs. AA: OR = 1.84, 95%CI = 1.04–3.28; CC vs. AA: OR = 2.66, 95%CI = 1.68–4.22; C vs. A: OR = 1.67, 95%CI = 1.03–2.71), which were mainly reflected in Asian subjects. For ovarian cancer, MTHFR C677T polymorphisms were only related with elevated ovarian cancer risk in Asian population, while no significant association was found for A1298C polymorphisms. This meta-analysis suggested that MTHFR C677T and MTHFR A1298C polymorphisms were correlated with elevated PCOS risk. MTHFR C667T only posed a higher risk for ovarian cancer in Asians instead of other populations, while MTHFR A1298C polymorphisms were not related to ovarian cancer risk. Further studies are needed to validate the conclusion.
Net platelet clot strength of thromboelastography platelet mapping assay for the identification of high on-treatment platelet reactivity in post-PCI patients
Authors: Cheng Daye , Zhao Shuo , Hao Yiwen 
Published: July 2020

Abstract
High-on treatment platelet reactivity (HTPR) leads to more prevalence of thrombotic event in patients undergoing percutaneous coronary interventions (PCI). Dual antiplatelet therapy with aspirin in addition to one P2Y12 inhibitor is commonly administrated to reduce HTPR. However, ‘one size fits all’ antiplatelet strategy is widely implemented due to lacking benefits with tailored strategy. One reason for the failure of tailored treatment might be less specificity of the current indicators for HTPR. Therefore, searching for specific indicators for HTPR is critical. Thromboelastograph with platelet mapping (TEGpm) assay has been explored for identifying HTRP. Variables of TEGpm assay, including maximum amplitude (MA) induced by thrombin (MAthrombin), R time, platelet aggregation rate induced by ADP (TEGaradp) and MA induced by ADP (MAadp) have been demonstrated to be able to identify HTPR in post-PCI patients. However, these variables for HTPR might be less specific. Thus, in the present study, a novel variable nMAadp was derived by removing fibrin contribution from MAadp and analyzed for its usefulness in determining HTPR. In addition, MAthrombin, R time, MAadp and TEGaradp were also examined for determining HTPR. In conclusion, nMAadp and TEGaradp were demonstrated to be independent indicators for HTPR; nMAadp had the strongest power to identify HTPR with cutoff value of 26.3 mm; MAthrombin and R time were not significantly different between patients with and without HTPR; combination of TEGaradp and nMAadp further improved the ability to identify HTPR with an AUC of 0.893.
The interaction of the main actuators of hydraulic excavators
Authors: Nabiullin Rustem , Teliman Irina , Khoroshavin Sergey 
Published: July 2020

The operation modes of the main actuators of hydraulic excavators during their joint operation in the process of rock excavation are considered. It is shown that the main mechanisms for turning the boom of the handle and the bucket are part of hydromechanical units consisting of an engine (hydraulic cylinder) and a main mechanism in which the engine (the cylinder and the rod itself) and elements of the working equipment (boom, handle or bucket) are the links of the mechanism.
It has been established that the relationship between the parameters of the mechanical energy of the engines and the power parameters implemented on the driven (output) links of the mechanisms depend on the magnitude of the extension of the hydraulic cylinder rod. Mathematical models of the main mechanisms are developed. A computational experiment was carried out to determine the actual values of energy-power parameters implemented on the cutting edge of the bucket (teeth) during excavation of rocks at characteristic points of the excavator's working area, as well as reactive loads in the rota-tion mechanisms of the boom and stick.
The proposed methodology for determining the operational parameters of the main mechanisms will allow us to estimate the range of changes in the power parameters implemented on the cutting edge of the bucket in the working area and to identify the relationship between active and reactive loads in the mechanisms due to the serial connection of hydromechanical units.
In the race for knowledge, is human capital the most essential element?
Authors: Sinay Laura , Carter Rodney William , de Sinay Maria Cristina Fogliatti 
Published: July 2020

AbstractClarivate Analytics, managers of Web of Science, publishes an annual listing of highly cited researchers. The opening sentence of the 2019 report asks “Who would contest that in the race for knowledge, is human capital that is most essential?”. They go on to state that “talent—including intelligence, creativity, ambition, and social competence (where needed)—outpaces other capacities such as access to funding and facilities”. These contradict previous findings, according to which other factors are possibly more influential than human capital. Using Clarivate Analytics’ database for 2018, we investigated which factors are most relevant in development of scientific knowledge. Rather than human capital alone, we found that language, gender, funding, and facilities introduce bias to assessments and possibly prevent talent and discoveries from emerging. We also found that the profile of the highly cited scholars, as established by Clarivate Analytics, is so narrow that it may compromise the validity of scientific knowledge, because it is biased towards the perception and interests of male scholars affiliated with very-highly developed countries where English is commonly spoken and of their sponsors. This highly cited scholars accounted for 76% of the random sample analyzed, absent were women from Latin-America, Africa, Asia, and Oceania, and scholars affiliated with institutions in low-human-developed countries. Also, 98% of the published research came from institutions located in very-highly developed countries. These findings provide evidence that challenges the view that ‘talent is the primary driver of scientific advancement’. This is important because search engines, such as Web of Science, can modify their algorithms to ensure the work of scholars that does not fit the currently dominant profile can have their importance increased so that their findings can more equitably contribute to knowledge development. This, in turn, will increase the validity of scientific inquiry.
Sentiments and emotions evoked by news headlines of coronavirus disease (COVID-19) outbreak
Authors: Aslam Faheem , Awan Tahir Mumtaz , Syed Jabir Hussain , Kashif Aisha , Parveen Mahwish 
Published: July 2020

AbstractThe chronic nature of coronavirus disease (COVID-19) outbreak and lack of success in treatment and cure is creating an environment that is crucial for mental wellbeing. Presently, we extracted and classified sentiments and emotions from 141,208 headlines of global English news sources regarding the coronavirus disease (COVID-19). The headlines considered were those carrying keyword coronavirus between the time frame 15 Janaury, 2020 to 3 June, 2020 from top rated 25 English news sources. The headlines were classified into positive, negative and neutral sentiments after the calculation of text unbounded polarity at the sentence level score and incorporating the valence shifters. In addition, the National Research Council Canada (NRC) Word-Emotion Lexicon was used to calculate the presence of eight emotions at their emotional weight. The results reveal that the news headlines had high emotional scores with a negative polarity. More precisely, around 52% of the news headlines evoked negative sentiments and only 30% evoked positive sentiments while 18% were neutral. Fear, trust, anticipation, sadness, and anger were the main emotions evoked by the news headlines. Overall, the findings of this study can be weaved together into important implications for emotional wellbeing and economic perspective.
Sensorimotor adaptation and aftereffect to frequency-altered feedback in Mandarin-speaking vocalists and non-vocalists
Authors: Ning Li-Hsin 
Published: July 2020

Abstract
This research examined sensorimotor adaptation and aftereffect in trained vocalists and non-vocalists whose native
language is Mandarin. The adaptive frequency-altered feedback paradigm involving a baseline of normal auditory feedback, a
training phase of incrementally or decrementally changed feedback, and a test phase of normal auditory feedback was administered.
The participants were asked to produce the sustained vowel /a/, Mandarin /ma1/ (“mother”), and Mandarin /ma2/ (“hemp”). The
results show that the vocalists compensated less than the non-vocalists, suggesting that the vocalists’ audio-motor
representations for pitch could be more entrenched than the non-vocalists’. All the participants displayed sensorimotor
adaptation, indicating that online recalibration is an innate and automatic process. The presence of the aftereffect, however,
depended on the stimulus type and vocal training experience. It appeared in all speakers’ responses to downward shift of /ma1/ and
/ma2/, but only in the non-vocalists’ responses to /a/.
The role of duration in speech plans uncovered by startling auditory stimulus
Authors: Chiu Chenhao 
Published: July 2020

AbstractThis study investigated how speech targets of different durations may be specified in speech plans and the release in response to startling auditory stimulus (SAS) triggering. In particular, we examined whether differentiated musical training background affects responses in terms of the preservation of duration. The results show that facilitated reaction time (RT) is only observed in SAS-induced responses shorter than 500 ms, suggesting that targets longer than 500 ms may not be as susceptible to SAS-induced rapid release. While both musically trained and untrained participants lacked accuracy in producing targets with fixed durations, they were able to differentiate syllable lengths, even though duration does not denote phonemic contrasts in Mandarin. The results also show a degree of compensation to elevated pitch level from musically trained participants, suggesting that they may have a higher sensitivity to pitch level even within a limited duration window.
A systematic review of occupational radiation individual dose monitoring among healthcare workers exposed in Africa
Authors: Gbetchedji Arnaud A , Houndetoungan Gilles D , Hounsossou Hubert C , Journy Neige , Haddy Nadia , Rubino Carole , Biaou Olivier , Medenou Daton , Amoussou-Guenou Kuassi M , de Vathaire Florent , Allodji Rodrigue S 
Published: July 2020

Abstract
Dosimetric monitoring is useful to limit exposures to ionising radiation in medical occupational settings, and reduce subsequent health risks. Scientific literatures, such as the UNSCEAR report 2017 and International Atomic Energy Agency Report 2014b, updated information on this subject; however, few African works have been found. This is the reason why we undertook this study, which summarises existing information on monitoring external radiation exposure doses for the whole body, using data from medical workers on this continent. Using standard terms and combining different keyword searches for radiation dose monitoring among radiology healthcare workers in Africa, from the titles, abstracts, and full texts, we found 3139 articles in the PubMed/MEDLINE, Google Scholar and INIS databases. Two reviewers screened the retrieved publications based on predefined eligibility criteria to identify relevant studies, extract key information from each, and summarise the data in table form. A total of 20 potentially relevant articles were identified. Among these 20 articles, 15 reported the overall average annual effective dose. Studies included in this systematic review represent an inventory of the radiation protection of medical workers in various African countries, with a focus on the monitoring of occupational radiation exposure. The size of studied populations ranged between 81 and 5152 occupational exposed workers. The mean annual effective doses ranged from 0.44 to 8.20 mSv in all specialities of medical sectors, while diagnostic radiology ranged from 0.07 to 4.37 mSv. For the nuclear medicine and radiotherapy from medical groups, the mean annual effective dose varied between 0.56 and 6.30 mSv. Industrial and research/teaching sectors data varied between 0.38 to 19.40 mSv. In conclusion, more studies implemented on dosimetric monitoring in Africa are needed to get a real picture of occupational exposure in the continent.
A parameter-adaptive variational mode decomposition approach based on weighted fuzzy-distribution entropy for noise source separation
Authors: Zhou Qidi , Zhang Junhong , Zhou Tianyi , Qiu Yongbo , Jia Hongjie , Lin Jiewei 
Published: July 2020

Abstract
Due to limitations in the generalisation ability of currently proposed improved variational mode decomposition (VMD) methods, it is hard to precisely and efficiently discern signal characteristics from different power systems. Meanwhile, it is difficult to separate non-order noise sources in current studies. To address this issue, a novel scheme is proposed based on parameter-adaptive VMD and partial coherence analysis (PCA) for separating noise sources. In this approach, weighted fuzzy-distribution entropy (FuzzDistEn) is constructed to optimise the VMD to adaptively obtain the optimal parameters, considering the complexity of the signal system, and the mutual information between the decomposition components and the original signal. To verify the effectiveness and superiority of the proposed method, the paper respectively compares the decomposition results of the simulated signal using different objective functions, and shows that the weighted FuzzDistEn has a better decomposition effect. For the other issue, PCA is adapted to estimate the coherence between component vibration and radiated noise. In a case study, the parameter-adaptive VMD-PCA approach is implemented in a diesel engine noise identification field based on bench experiments. The results show that the proposed method can successfully separate five surface radiated noise sources. The research offers a new perspective on feature extraction problems.
Understanding the effect of rolling friction in the inclined track
experiment
Authors: Maslova K , de Jesus V L B , Sasaki D G G 
Published: July 2020

Abstract
In general, undergraduate experimental physics laboratories do not usually have
experiments designed to address rolling friction and to measure the value of the
rolling friction coefficient. This work explores an experiment, which has the
potential to arouse students’ curiosity about rolling friction by
addressing a counterintuitive aspect of the behavior of a sphere that rolls up,
stops and then rolls down on an inclined track. In fact, due to the difference
in the net static friction in the upward and downward movements caused by the
rolling friction term, the sphere’s acceleration when rolling upward is
higher than when rolling downward. This difference, which had been predicted
theoretically, was easily demonstrated graphically by video analysis, using both
rubber and mouse balls. For two steel balls, this difference was more subtle,
but it was still possible to detect it numerically. The experimental setup
employed typical laboratory equipment and the free video analysis software
Tracker to collect position and velocity data. The rolling
friction coefficient was calculated with good precision by means of an angular
coefficient of a fitted first-degree function involving appropriate
variables.
Wigner function and photon number distribution of a superradiant state in semiconductor heterostructures
Authors: Vasil’ev Peter P , Penty Richard V 
Published: July 2020

Abstract
Advanced quantum technologies require sources of non-Gaussian and non-classical light. For the understanding of properties of quantum light it is necessary to reconstruct its quantum state. Here, we use time-domain optical homodyne tomography for the quantum state recognition and reconstruction of the femtosecond optical field from a nonequilibrium superradiant coherent electron–hole state formed in a semiconductor GaAs/AlGaAs heterostructure. We observe severe deviations from the Poissonian statistics of the photons associated with the coherent state when the transformation from lasing to superradiance occurs. The estimated Mandel parameter Q of the superradiant states is in the range of 1.08–1.89. The reconstructed Wigner functions show large areas of negative values, a characteristic sign of non-classicality, demonstrating the quantum nature of the generated superradiant emission. The photon number distribution and Wigner function of the superradiant state are very similar to those of the displaced Fock state.
Microfluidic inertial switch with delay response characteristics
Authors: Nie Weirong , Liu Guowei , Zhang Runduo 
Published: July 2020

Abstract
This paper proposes an innovation microfluidic inertial switch structure with precise time delay response characteristic, which can be used in the fuze safety and arming system. The switch works on the principle of fluidic inertial force and capillary valve, which makes it sensitive to the unidirection acceleration load and has the ability to recognize the acceleration amplitude. The microfluidic inertial switch has a structure of a J-shaped reservoir, capillary valves, a serpentine delay microchannel and a U-shaped latching microchannel. The acceleration threshold is analyzed theoretically considering the surface tension coefficient of the gas-liquid interface. The delay response time of the switch is studied by finite element simulation based on the Gambit 2.4 and Fluent 6.3 software. The prototype is fabricated by wet etching technology and magnetron sputtering metal technology. Many tests have been done to verify the functions of the switch. The experimental results are matched well to the results of calculation and simulation. When the capillary valve throat widths are 80μm, 120μm, 160μm, the thresholds of the switch are 75.1g, 46.6g, 36.5g. When the switch is loaded with a 75g acceleration load, the delay response is 146.7ms. Finite element simulation and experimental results show that the switch can effectively identify the acceleration threshold, and can achieve a precise delay response under a certain load.
Study on precise detecting and controlling technology of lag angle based on image processing
Authors: Zhan K , Shan L , Xu L , Dong X , Bo G 
Published: July 2020

Abstract
A precise method of detecting and controlling of lag angle during the optical fiber winding procedure is described in this paper. The system is composed of three modules, image collection, image processing and PC controller. Images of lag angle are collected by an industrial high-speed camera. Binary treatment on lag angle images of the motive optical fiber is done by global threshold method. Image identification of lag angle of the motive optical fiber is realized by Hough transform, thus the digital values of lag angel are obtained. PC outputs controlled variables to modify the winding motion based on detecting results so as to limit the lag angel in a precise range. The research result indicates that application of image collection and identification technology to optical fiber winding can avoid winding flaw effectively such as gap and lamination thus to improve the quality and efficiency of optical fiber winding.
Critical deflagration criterion of PTFE/Al/W reactive materials
Authors: Zheng Yuanfeng , Ma Hongbing , Guo Huanguo , Su Chenghai 
Published: July 2020

Abstract
The unique reaction regime of reactive materials includes processes of impact-induced fracture, pre-ignition, post-perforation dispersion, local initiation, and deflagration. The complex interaction between reactive materials and target leads to difficulty in describing critical deflagration criterion of reactive materials. As such, a fundamental projectile/target interaction condition for the complete deflagration of reactive material fragment is derived based on the 1-dimensional shock wave relationships. The critical deflagration pressure Pc of reactive materials is fitted based on the energy release experiments of reactive material fragments. The results show the importance and necessity of the fracture behavior to the deflagration, and the deflagration behavior depends on impact velocity, geometry of reactive material fragment, target material and thickness, et al. As for the deflagration of fractured reactive materials behind the target, the critical deflagration size for reactive material debris is obtained based on the Grady energy model.
The research on transparent armor material technology
Authors: Zhang C , Cao J W , Guo J B , Liu F F , Wang C , Hasi G W , Guo Z Z 
Published: July 2020

Abstract
Transparent armor is a kind of protective material integrating of structure and function, which has high transparency and high physical-chemical properties. It is widely used in ground vehicles, air platforms, personnel protective masks and other equipments. As a kind of highly strategic protective material, the new transparent armor with light weight, high transparency and high protection factor has a broad application prospect. The paper focuses on the research progress of new transparent armor materials at home and abroad, compares the current situation, analyzes the difference and puts forward some insights.
Study on preparation and properties of aramid/stainless steel fiber blended electromagnetic shielding fabric
Authors: Wu Yilin , Li Yonggui , Ma Wenxiao 
Published: July 2020

Abstract
In order to develop electromagnetic shielding (EMS) fabric with high-performance, aramid / stainless steel fiber blended yarns were used to achieve it, and its electromagnetic shielding effectiveness (EMSE), flame retardancy and tensile properties were tested. The effects of fabric structure, fabric thickness, and fabric overlap angle on fabric properties were studied. The results showed that the plain weave fabric has the best EMSE among three kinds of fabrics with plain, twill and satin weaves. The EMSE of the satin weave is the worst. When the fabric thickness increased, the EMSE enhanced. The EMSE at the fabric overlap angle of 45° is the highest when the overlap angle is changed from 0° to 90°.