bluuebunny/crossref_metadata_2025_split huggingface dataset:
Open‐phase temporary overvoltage before and after an intermediate subsation accessing a long distance transmission line
Authors: Xiaoyue Chen , Zeyu He , Huashi Wu , Hailiang Lu , Yu Wang , Lei Lan , Xishan Wen 
Published: December 2020

AbstractIn transmission lines, shunt‐reactors are commonly applied to counteract the “Ferranti effect.” However, in highly compensated lines, hazardous overvoltage may occur during unbalanced open‐phase conditions. In addition, when a new substation is put into operation, π circuit can be selected by accessing an existing transmission line and the original shunt‐reactor configuration is maintained. Severe overvoltage may occur on the shunt‐reactor side of the newly installed transmission line. In this study, we analysed the effects of compensation, neutral‐reactor, and system frequency on open‐phase overvoltage. The maximum deviation of system frequency is <±0.5 Hz, therefore, we suggested maximum critical compensation of the shunt‐reactor under different proportional coefficients of neutral‐reactor. We analysed the impact of line division, when an intermediate substation is accessed, and a risk range in which the substation located may cause severe overvoltage was proposed. Finally, according to an actual line division project, we optimised the original configuration scheme of the shunt and neutral‐reactors. We used electromagnetic transient simulation to verify whether severe overvoltage occurred before and after the power station is accessed. The study results may provide guidance for selection of the π circuit accessing point and for optimising the configuration of the shunt and neutralreactors.
Study on fault line detection methods based on multi‐feature fusion in distribution systems
Authors: Yuan Jiawei , Jiao Zaibin , Feng Guang , Chen Ming , Xu Mingming 
Published: December 2020

AbstractFaulted line detection is used for locating faults and restoring service after the occurrence of a single line‐to‐ground fault in a non‐effectively earthed network. The traditional single faulted line detection method cannot adapt to the fault diagnosis of distribution systems under unfavourable conditions, while faulted line selection schemes based on neural network have poor generalisation ability when the structure of distribution network changes. A novel faulted line detection method based on multi‐feature integration is proposed to overcome the shortcomings of the previous methods. This study classifies the different fault characteristics of single line‐to‐ground faults in distribution systems, and analyses the applicable range of existing methods under multiple fault conditions. Subsequently, three detection methods that can be applied to different fault conditions and have complementarity are employed for feature extraction. Moreover, the extracted features of a feeder are processed by introducing the fault features of the remaining feeders, and the processed features are fused based on the fuzzy theory. Considering the selection of fault measure functions and weight coefficients in the fuzzy theory based on experience, an adaptive‐network‐based fuzzy inference system is employed for feature fusion. PSCAD and RTDS experiments confirmed the superior generalisation ability of the proposed method.
Optimization to POD parameters of DFIGs based on the 2nd order eigenvalue sensitivity of power systems
Authors: Li Shenghu , Zhang Hao , Li Yikai 
Published: December 2020

AbstractHere, the analytical model of the 2nd order eigenvalue sensitivity is improved, and applied to optimize the parameters of the power oscillation dampers of the doubly‐fed induction generators. To solve the 2nd order eigenvalue sensitivity, the eigenvector sensitivity is required whose difficulty lies in insufficient constraints, for which two constraints about the magnitude and the angle of eigenvector elements are newly introduced, and the normalization conditions are derived to solve the eigenvector sensitivity. The 2nd order eigenvalue sensitivity is applied to analyse the change of the low‐frequency oscillation modes with the varying of parameters in the power systems with the doubly‐fed induction generators. To improve the low‐frequency oscillation modes, the optimization model of the power oscillation damper parameters is newly formulated based on the 1st and the 2nd order eigenvalue sensitivities and solved by the interior point method. The numerical results are provided to verify the effectiveness of the constraints proposed; the advantages of the 2nd order eigenvalue sensitivity in the eigen‐analysis and parameters optimization, and the robustness against wind fluctuation.
Triple‐band antenna using double periodic CRLH resonator on coplanar waveguide
Authors: Mohan Manoj Prabhakar , Alphones Arokiaswami , Karim Muhammed Faeyz 
Published: December 2020

AbstractThe uniplanar implementation of double periodic composite right/left‐handed (DPCRLH) symmetric unit cell is realized using coplanar waveguide and its analysis with parameter extraction are studied. DPCRLH symmetric unit cell is then experimentally validated. The open‐circuited DPCRLH resonator is formed from the DPCRLH unit cell which exhibited five resonance points. The simulated resonant frequencies of the resonator are 1.5494, 2.1968, 3.5072, 5.0438 and 6.089 GHz. A triple‐band antenna is designed from the last three resonant frequencies of the resonator. The antenna is horizontally polarized in all three bands. The measured co‐polarized gain of the antenna at the central frequencies of the three bands are 1.52 dBi (3.59 GHz), 3.67 dBi (5.1694 GHz) and 1.78 dBi (6.0925 GHz), respectively.
Improved wideband phase balancing SIW unequal power divider design for the low side‐lobe array antennas
Authors: Shehab Shahriar Hasan , Feng Jiewei , Karmakar Nemai , Amin Emran Md , Walker Jeffrey 
Published: December 2020

AbstractIn this paper, an eight‐way substrate integrated waveguide unequal power divider with an enhanced co‐phase bandwidth is presented, and demonstrated a potential application for the Ku‐band radiometer antennas. The proposed divider design is based on the −35 dB Chebyshev beam‐shaping algorithm to achieve at minimum −25 dB of antenna side‐lobe level (SLL) and high beam efficiency (>90%). Investigations on different unequal power splitting techniques are discussed, and an efficient method for the unequal power division is proposed, exhibiting improved co‐phase bandwidth and wideband matching. The proposed unequal eight‐way power divider demonstrates a wider co‐phase bandwidth of 10% within 10° phase error and the −15 dB return loss bandwidth of 36.8%. Furthermore, the proposed unequal divider is integrated with eight longitudinal slot radiators, designed at 18.7 GHz and exhibits low radiation loss (better than −1.3 dB). The antenna measurement results exhibit a symmetrical fan beam radiation pattern and satisfied the goal of −25 dB SLL, resulting high beam efficiency of 97% and gain of 13.45 dBi. Therefore, the proposed unequal power divider technique shows the potential to be utilised in the low SLL antenna array designs for an accurate brightness temperature measurement of radiometer systems. The application of this technique can be further extended to radar and satellite/wireless communications.
Adaptive energy efficient fuzzy: An adaptive and energy efficient fuzzy clustering algorithm for wireless sensor network‐based landslide detection system
Authors: Ahmed Suhaib , Gupta Swastik , Suri Ashish , Sharma Sparsh 
Published: December 2020

AbstractIt is a well‐known research outcome that clustering helps in increasing the network lifetime and the routing performance. This research thus aims to optimize the energy consumption of wide scale wireless sensor networks (WSNs) by proposing a novel and an adaptive energy efficient fuzzy (AEEF) clustering for a WSN. It is an improvement and modification on the traditional clustering of the cells of the network for Landslide Detection systems. It incorporates the concept of fuzziness and state machine in selecting the cluster heads, unlike previously clustering algorithms such as low‐energy adaptive clustering hierarchy and so on. The proposed AEEF approach is validated by carrying out simulations and the results show that the average energy consumption per node under no‐clustering is 0.5144892 mJ, whereas it reduces drastically to 0.084482 mJ using the proposed AEEF clustering algorithm. Hence, the proposed algorithm is approximately 83.5% more energy efficient and thus increases the lifetimes of the nodes deployed for sensing a landslide along with being adaptive to any changes in the ambient conditions.
Design and application of the multi‐transmitting and multi‐receiving ionospheric detection network
Authors: Qi Hao , Chen Gang , Gong Wanlin , Huo Da , Li Yaxian , Wang Zhihua 
Published: December 2020

AbstractTo observe a large area of ionosphere with relatively dense observing points, we design and implement an experimental multi‐transmitting and multi‐receiving ionospheric detection network in China. Two transmitters located in Wuhan and Mile and two receivers located in Kaiyuan and Luxi are used to form the ionospheric detection network. The radio echoes of the network are reflected at the mid‐point ionosphere between the transmitter and receiver. The radio systems in the network work simultaneously and the echoes from the two transmitters can be recorded in one ionogram of a receiver. With the inversion technique, the oblique‐incidence ionogram is converted to a vertical‐incidence ionogram, and then the ionospheric parameters, such as the critical frequency and peak height of F2‐layer (foF2 and hmF2), as well as the electron density profile, can be obtained. The foF2 variation recorded by the oblique‐incidence ionograms is compared with the same data of the vertical‐incidence ionosondes in Qujing and Chongqing. There is a little deviation between the observation results of the two kinds of the ionospheric detection systems. The preliminary experimental results show that the ionospheric oblique‐incidence detection network composed of several independent high‐frequency transmitters and receivers is an effective and low‐cost solution for large‐area ionospheric observation.
Unambiguous range extension for pulse‐Doppler radar via Poisson disk sampling
Authors: Dong Boyuan , Li Gang , Wang Kunpeng , Duan Meiya 
Published: December 2020

AbstractSince the maximum unambiguous range in the traditional single‐channel pulse‐Doppler (PD) radar is restricted by the pulse repetition interval (PRI), there is a trade‐off between the maximum unambiguous range and the maximum unambiguous velocity. As a result, conventional coherent processing used in PD radar systems can hardly provide large unambiguous range and large unambiguous velocity simultaneously. We propose a method of unambiguous range extension for PD radar via Poisson disk sampling. The method enables the PD radar to detect farther targets unambiguously without sacrificing the maximum unambiguous velocity. The Poisson disk sampling is adopted in the slow time domain to ensure the interval length between any two adjacent transmitted pulses to be larger than a desired value, which can be set longer than the Nyquist sampling interval to extend the maximum unambiguous range. Then, the Iterative Soft Thresholding like (IST‐like) algorithm is utilized on the non‐uniformly under‐sampled data to recover the range‐Doppler spectrum accurately. Compared to some of existing methods of unambiguous range extension based on stochastic sampling, the proposed method has better velocity estimation accuracy. Simulations and experiments on real PD radar data demonstrate the effectiveness of the proposed method.
Treating Fungal Keratitis with Oral Voriconazole Only: A Case Series
Authors: Chen Di , Tan Shaojian , Zou Wenjin 
Published: December 2020

Abstract
Background To report the clinical effect of oral voriconazole only as a treatment for fungal keratitis.
History and Signs Three patients (1 female and 2 males) with culture-proven fungal keratitis (1 Mucoraceae, 1 Aspergillus, 1 Fusarium) were included in this study. The patients were treated with oral voriconazole 200 mg twice daily to observe the clinical response in the treatment of fungal keratitis.
Therapy and Outcome The mean age of the patients was 51 years and the average treatment duration was 6 weeks. The corneal inflammation in these three patients was eliminated by oral voriconazole only.
Conclusions This is the first reported case of oral voriconazole only as a treatment for fungal keratitis. We found that oral voriconazole has a significant clinical effect on the treatment of fungal keratitis.
Progress and Barriers Towards Elimination of Chronic Hepatitis C in Children
Authors: Pluta Magdalena , Pokorska-Śpiewak Maria , Aniszewska Małgorzata , Kowalik-Mikołajewska Barbara , Marczyńska Magdalena 
Published: December 2020

AbstractChronic hepatitis C (CHC) is a global health burden. Mother-to-child transmission (MTCT) accounts for most HCV infections in pediatric patients. Spontaneous viral clearance may occur in early childhood but is uncommon thereafter. Infection is usually asymptomatic during childhood, although without an effective treatment, vertically infected children may develop serious liver complications including cirrhosis and hepatocellular carcinoma in adulthood. Despite the lack of vaccine against hepatitis C and effective post-exposure methods of prevention of MTCT, treatment with direct-acting antiviral agents (DAAs) raised the prospect of eliminating HCV on a population level. Highly effective, well-tolerated, oral, and interferon-free regimens of short duration have revolutionized treatment of CHC. However, access to these therapies might be limited because of its high cost. In this review, we provide the current state of knowledge on the epidemiology, testing, monitoring and treating of HCV in children. We outline the remaining gaps in therapy and barriers to disease eradication.
Lethal Neonatal Respiratory Failure by Perinatal Transmission of Ureaplasma Parvum after Maternal PPROM
Authors: Zöllkau Janine , Pieper Dietmar H. , Pastuschek Jana , Makarewicz Oliwia , Mentzel Hans-Joachim , Dawczynski Kristin , Schleußner Ekkehard 
Published: December 2020

AbstractA primiparous pregnant woman was admitted due to preterm premature rupture of membranes (PPROM) at 27+0 week of gestational age (WGA). Conventional vaginal microbiological analysis had no pathological finding. Management decisions based on national guidelines included antenatal corticoids, tocolytics and antibiotics. Unstoppable efforts of preterm labor in 28+0 WGA and supposed amniotic infection syndrome necessitated emergency cesarean section. The preterm infant underwent NICU therapy, developed an early-onset neonatal sepsis and therapy-refractory pulmonary insufficiency with consecutive right heart failure, resulting in death on the 36th day of life. Microbiota analyses by 16Sr DNA sequencing was performed from maternal vaginal swabs and from neonatal pharyngeal swabs. Maternal antibiotic treatment resulted in depletion of physiological vaginal colonization with Lactobacillus crispatus. Ureaplasma parvum became the dominant vaginal microorganism at delivery and was detected in high relative abundance in the neonatal specimen. Progressive radiological air-space changes and interstitial pathologies associated with Ureaplasma infection (bronchopulmonary dysplasia type III) were seen early at the 3rd and distinctly from 14th day of life. This clearly demonstrates the need of vaginal colonization diagnostics in PPROM patients and awareness of the consecutive risks in the preterm. Vaginal microbiome analysis may allow individualized and targeted maternal and fetal diagnostic, prophylactic and therapeutic strategies to identify, protect and treat the high-risk neonates after PPROM.
Synthesis and Reactivity of Uhle’s Ketone and Its Derivatives
Authors: Piersanti Giovanni , Bartoccini Francesca 
Published: December 2020

AbstractUhle’s ketone and its derivatives are highly versatile intermediates for the synthesis of a variety of 3,4-fused tricyclic indole frameworks, i.e. indole alkaloids of the ergot family, that are found in various bioactive natural products and pharmaceuticals. Therefore, the development of a convenient preparative method for this structural motif as well as its opportune/useful derivatization have been the subject of longstanding interest in the fields of synthetic organic chemistry and medicinal chemistry. Herein, we summarize recent and less recent methods for the preparation of Uhle’s ketone and its derivatives as well as its main reactivity towards the synthesis of bioactive substances. Regarding the preparation, it can be roughly classified into two categories: (a) using 4-unfunctionalized and 4-functionalized indole derivatives as starting materials to construct a fused six-member ring, and (b) constructing the indole ring through intramolecular cycloaddition. Principally, the reactivity of the cyclic Uhle’s ketone shown here is derived from the classical electrophilicity of the carbonyl carbon or the acidity of the α-hydrogen and, though less intensively investigated, chemical reactions that induce ring expansion to form novel ring skeletons.1	Introduction2	Synthesis2.1	Disconnection A: Cyclization Reaction of the Opportune 3,4-Disubstituted Indole2.2	Disconnection B: Intramolecular Friedel–Crafts Cyclization2.3	Disconnection B: Intramolecular Cyclization via Metal–Halogen Exchange2.4	Disconnection C: Intramolecular Diels–Alder Furan Cycloaddition2.5	Disconnection D: Intramolecular Dearomatizing [3 + 2] Annulation3	Reactivity3.1	Use of Uhle’s Ketone for Lysergic Acid3.2	Use of Uhle’s Ketone for Rearranged Clavines3.3	Use of Uhle’s Ketone for Medicinal Chemistry4	Conclusion and Outlook
Parenteral Nutrition Ascites: Calamity from an Umbilical Vein Cannula
Authors: Anand Vishnu , Pournami Femitha , Panackal Anila V. , Nandakumar Anand , Prabhakar Jyothi , Jain Naveen 
Published: December 2020

AbstractUmbilical vein catheterization is considered a critical requirement in preterm neonates for the administration of fluids and parenteral nutrition. However, inadvertent migration and malposition are known to cause complications that are often life-threatening. We describe a neonate with parenteral nutrition-associated lipid ascites owing to extravasation from an umbilical vein cannula. Fatality was averted due to prompt recognition and paracentesis that was therapeutic and confirmed the diagnosis as well.
Foeniculum vulgare (fennel).
Authors: Datiles Marianne Jennifer , Popay Ian 
Published: December 2020

Abstract

Foeniculum vulgare, also known as sweet fennel, is a common kitchen herb used around the world - but it is also a highly invasive weed that can severely damage ecosystems. A risk assessment prepared for Hawaii gave the species a high risk score of 19 (PIER, 2015). F. vulgare is known to alter fire regimes and create dense stands, outcompeting native flora for nutrients and space (DiTomaso et al., 2013; Cal-IPC, 2015). It was listed in the Global Compendium of Weeds as an "agricultural weed, casual alien, cultivation escape, environmental weed, garden thug, naturalised, noxious weed, weed" (Randall, 2012), and is known to be invasive (mostly in natural habitats rather than agricultural land) in California, New Zealand, significant parts of Australia and a number of locations in the Pacific. (PIER, 2015). The species is a principal weed in Mexico and New Zealand, a common weed in Argentina, Australia, Hawaii, and Spain, weedy in Chile, Morocco, Uruguay, the USA, and Venezuela, and it is known to be adventive in China, Colombia (Holm et al., 1979; Flora of China Editorial Committee, 2015; PIER, 2015; Vascular Plants of Antioquia, 2015). It is also reported as invasive in Ethiopia and Kenya. It can regenerate by both seeds and roots, which often makes physical control methods ineffective and chemical control necessary once a population is established.
How can team synchronisation tendencies be developed combining Constraint‐led and Step‐game approaches? An action‐research study implemented over a competitive volleyball season
Authors: Ramos Ana , Coutinho Patrícia , Ribeiro João , Fernandes Orlando , Davids Keith , Mesquita Isabel 
Published: December 2020

ABSTRACTCombining Constraint‐led (ecological) and Step‐Game (constructivist) approaches through an Action‐Research (AR) design conducted throughout a competitive volleyball season, this study aimed to: (i) analyse the impact of increased tactical complexity on lateral and longitudinal collective Synchronisation Tendencies (ST) during defensive and offensive counterattack‐subphases, and (ii) examine how opposition attacking contexts (i.e. playing in full‐system or in‐system) might influence ST throughout each counterattack‐subphase. Performance of a youth team, comprised of 15 players, was studied across three AR‐cycles. The team's competitive performance was analysed through three competitive matches (one per cycle). Team ST were evaluated using the cluster‐phase method and a 3 (matches) × 2 (counterattack‐subphases) × 2 (opposition attacking contexts) × 2 (court directions) repeated‐measures ANOVA were used to calculate the differences in cluster‐amplitude mean values. Results showed that increments in tactical complexity (second AR‐cycle) were followed by decreases in collective ST, which were (re)achieved during the third AR‐cycle, possibly due to the ecological‐constructivist coaching intervention. Our findings imply that coaches could design representative and specific‐didactical learning environments, predicated on a team's tactical needs and strategical ideas from a game‐plan, framing player intentionality. Results also support the use of questioning strategies to narrow players’ attentional focus, stimulating perceptual attunement to relevant constraints emerging in performance. Finally, the insider AR‐design provided valuable contextualised insights on coaching interventions for developing collective coordinative structures.
Yellow Peril: A Cosmopolitical Revision ofThe Chinaman
Authors: Szeto Kin-Yan 
Published: December 2020

AbstractThis article examines The Foreigner, the 2017 film adaptation of British novelist Stephen Leather’s The Chinaman (1992), starring the Hong Kong/Chinese martial arts film star Jackie Chan. The film reveals a cosmopolitical cinematic revision that foregrounds the contradictions and paradoxes of Yellow Peril, present when the film was made, during the time of Brexit in the United Kingdom. By investigating Chan’s screen persona, which has roots in Hong Kong/Chinese martial arts cinema, I focus on how the film derives and builds upon Chan’s transnational status as a cinema icon to critically engage with the conventional Yellow Peril narrative.