bluuebunny/crossref_metadata_2025_split huggingface dataset:
Parisi-Sourlas supergravity
Authors: Kellett Matthew , Morris Tim R 
Published: July 2020

Abstract
A manifestly diffeomorphism invariant exact renormalization group requires extra diffeomorphism invariant ultraviolet regularisation at some effective cutoff scale Λ. This motivates construction of a ‘Parisi-Sourlas’ supergravity, in analogy with the gauge theory case, where the superpartner fields have the wrong spin-statistics such that they can become Pauli–Villars regulator fields after spontaneous symmetry breaking. We show that in contrast to gauge theory, the free theory around flat space is already non-trivial and in a sense already displays some spontaneous symmetry breaking. We show that the fluctuating fields form multiplets whose mass matrices imply that the fields propagate into each other not only with the expected 1/p
2 but also through propagators with improved ultraviolet properties, namely 1/p
4 and 1/p
6, despite the fact that the action contains a maximum of two space-time derivatives.
Absolute measurements of the double differential electronic emission cross-sections of isolated pyrene molecule (C16H10) in interaction with keV protons
Authors: Ji M-C , Champeaux J-P , Moretto-Capelle P , Renoud J , Polizzi L , Faure S , Sence M , Cafarelli P 
Published: July 2020

Abstract
Electronic emission of an isolated pyrene molecule induced by 50 to 125 keV protons has been investigated. The corresponding absolute double differential cross-sections

∂

2

σ

∂
Ω
∂
E

have been measured at an angle of 35° with respect to the incident proton beam axis. These measurements were compared to the simulations of emitted electrons’ spectra using a semi-classical trajectory Monte-Carlo (SCTMC) approach. The simulated SCTMC cross-sections show reasonably good agreement with the measured ones.
Real-time single-frequency multi-GNSS positioning with ultra-rapid products
Authors: Bahadur Berkay , Nohutcu Metin 
Published: July 2020

Abstract
Ultra-rapid products, which do not require any external connection unlike real-time services, are an important alternative for real-time global navigation satellite system (GNSS) applications. Especially, the inclusion of newly-emerged satellite systems in ultra-rapid products opens up considerable opportunities to improve the positioning performance. In this regard, this study concentrates on the employment of the most recent ultra-rapid products besides traditional ones for real-time single-frequency multi-GNSS positioning using code and carrier phase measurements. In the study, experimental tests were conducted for the ionosphere-free code-carrier combination to evaluate the performance of single-receiver single-frequency positioning. The results reveal that single-frequency positioning is able to provide sub-meter level positioning accuracy with ultra-rapid products despite its performance alters depending on the applied product. Also, the performance of single-frequency positioning which based on code-carrier combination is not influenced significantly from the possible decline in the precision of ultra-rapid products over time due to the convergence of phase ambiguities. On the other hand, the results demonstrate that the accuracy of pseudorange positioning can significantly be improved with the integration of multi-constellation and the improvement ratio can reach 30% compared with the GPS-only solutions. Furthermore, the convergence time of GPS-only solution can be decreased by a ratio of 37% on average with multi-GNSS combinations. Finally, the results show that for the multi-constellation analyses, the solutions which utilize the ultra-rapid product of Wuhan University provide the best performance in terms of positioning accuracy and convergence time.
Direct determination of

kB⃗,Q,Q0

for cylindrical ionization chambers in a 6 MV 0.35 T MR-linac
Authors: Krauss A , Spindeldreier C K , Klüter S 
Published: July 2020

Abstract
To ensure accurate reference dosimetry with ionization chambers in magnetic resonance linear accelerators (MR-linacs), the influence of the magnetic field on the response of the ionization chambers must be considered. The most direct method considering the influence of magnetic fields in dosimetry is to apply an appropriate absorbed-dose-to-water primary standard. At PTB, a new water calorimeter has been designed which is capable to determine Dw,Q
in an MR-linac. The new device allows the direct calibration of ionization chambers in terms of absorbed dose to water for MR-linac irradiation conditions. Hence, the correction factors

k

B
⃗

,
Q
,

Q
0

can be determined which replace the current radiation-quality dependent correction factors

k

Q
,

Q
0

for dosimetry in the presence of magnetic fields. In cooperation with Heidelberg University Hospital,

k

B
⃗

,
Q
,

Q
0

factors were measured at the 6 MV 0.35 T Viewray MR-linac for different cylindrical ionization chambers with sensitive volumes ranging from 0.015 cm3 to 0.65 cm3. The chambers were placed both perpendicular and parallel in respect to the magnetic field. Standard uncertainties of about 0.5% were achieved.
Comparison of different modulations of photoplethysmography in extracting respiratory rate: from a physiological perspective
Authors: Liu Haipeng , Chen Fei , Hartmann Vera , Khalid Syed Ghufran , Hughes Stephen , Zheng Dingchang 
Published: July 2020

Abstract

Objective: Based on different physiological mechanisms, the respiratory modulations of photoplethysmography (PPG) signals differ in strength and resultant accuracy of respiratory frequency (RF) estimations. We aimed to investigate the strength of different respiratory modulations and the accuracy of resultant RF estimations in different body sites and two breathing patterns. Approach: PPG and reference respiratory signals were simultaneously measured over 60 s from 36 healthy subjects in six sites (arm, earlobe, finger, forehead, wrist-under (volar side), wrist-upper (dorsal side)). Respiratory signals were extracted from PPG recordings using four demodulation approaches: amplitude modulation (AM), baseline wandering (BW), frequency modulation (FM) and filtering. RFs were calculated from the PPG-derived and reference respiratory signals. To investigate the strength of respiratory modulations, the energy proportion in the range that covers 75% of the total energy in the reference respiratory signal, with RF in the middle, was calculated and compared between different modulations. Analysis of variance and the Scheirer–Ray–Hare test were performed with post hoc analysis. Main
results: In normal breathing, FM was the only modulation whose RF was not significantly different from the reference RF (p > 0.05). Compared with other modulations, FM was significantly higher in energy proportion (p < 0.05) and lower in RF estimation error (p < 0.05). As to energy proportion, measurements from the finger and the forehead were not significantly different (p > 0.05), but both were significantly different from the other four sites (p < 0.05).
In deep breathing, the RFs derived by BW, filtering and FM were not significantly different from the reference RF (p > 0.05). The RF estimation error of FM was significantly less than that of AM or BW (p < 0.05). The energy proportion of FM was significantly higher than that of other modulations (p < 0.05). Significance: Of all the respiratory modulations, FM has the highest strength and is appropriate for accurate RF estimation from PPG signals recorded at different sites and for different breathing patterns.
The formation of atomic oxygen and hydrogen in atmospheric pressure plasmas containing humidity: picosecond two-photon absorption laser induced fluorescence and numerical simulations
Authors: Schröter Sandra , Bredin Jérôme , Gibson Andrew R , West Andrew , Dedrick James P , Wagenaars Erik , Niemi Kari , Gans Timo , O’Connell Deborah 
Published: July 2020

Abstract
Atmospheric pressure plasmas are effective sources for reactive species, making them applicable for industrial and biomedical applications. We quantify ground-state densities of key species, atomic oxygen (O) and hydrogen (H), produced from admixtures of water vapour (up to 0.5%) to the helium feed gas in a radio-frequency-driven plasma at atmospheric pressure. Absolute density measurements, using two-photon absorption laser induced fluorescence, require accurate effective excited state lifetimes. For atmospheric pressure plasmas, picosecond resolution is needed due to the rapid collisional de-excitation of excited states. These absolute O and H density measurements, at the nozzle of the plasma jet, are used to benchmark a plug-flow, 0D chemical kinetics model, for varying humidity content, to further investigate the main formation pathways of O and H. It is found that impurities can play a crucial role for the production of O at small molecular admixtures. Hence, for controllable reactive species production, purposely admixed molecules to the feed gas is recommended, as opposed to relying on ambient molecules. The controlled humidity content was also identified as an effective tailoring mechanism for the O/H ratio.
Low-temperature positive magnetoresistance in ZnO-based heterostructures
Authors: Ma X R , Zhang X H , Gao Y F , Li Q L , Gao K H 
Published: July 2020

Abstract
The positive magnetoresistance (MR) usually appears at cryogenic temperature in ZnO-based transport systems, the origin of which is reported to be related to the localized magnetic moment. Here we find a different origin of the positive MR in Zn1−x
Mg
x
O/ZnO heterostructures prepared by magnetron sputtering. The large positive MR is observed in all samples at 2 K. On increasing temperature, the observed positive MR is gradually suppressed and transformed into the negative MR at higher temperature. Similarly, the suppression of the positive MR also occurs in the samples with the higher electron density. The experimental data can be well described by applying a two-band model combined with the weak localization (WL) theory. This indicates that the observed positive MR originates from the impurity-band-related two-band transport, while the observed negative MR arises from the WL.
Multi-label learning for improving discretely-modulated continuous-variable quantum key distribution
Authors: Liao Qin , Xiao Gang , Zhong Hai , Guo Ying 
Published: July 2020

Abstract
We propose a novel scheme for discretely-modulated continuous-variable quantum key distribution (CVQKD) using machine learning technologies, which called multi-label learning-based CVQKD (ML-CVQKD). In particular, the proposed scheme divides the whole quantum system into state learning process and state prediction process. The former is used for training and estimating classifier, and the latter is used for generating final secret key. Meanwhile, a multi-label classification algorithm (MLCA) is also designed as an embedded classifier for distinguishing coherent state. Feature extraction for coherent state and related machine learning-based metrics for the quantum classifier are successively suggested. Security analysis based on the linear bosonic channel assumption shows that MLCA-embedded ML-CVQKD outperforms other existing discretely-modulated CVQKD protocols, such as four-state protocol and eight-state protocol, as well as the original Gaussian-modulated CVQKD protocol, and it will be further enhanced with the increase of modulation variance.
Dynamical structure factors of a two-dimensional Fermi superfluid within random phase approximation
Authors: Zhao Huaisong , Gao Xiaoxu , Liang Wen , Zou Peng , Yuan Feng 
Published: July 2020

Abstract
Based on random phase approximation, we numerically calculate dynamical structure factors of a balanced two-dimensional (2D) Fermi superfluid, and discuss their energy, momentum and interaction strength dependence in the 2D BEC–BCS crossover. At a small transferred momentum, a stable Higgs mode is observed in the unitary 2D Fermi superfluid gas where the particle–hole symmetry is not satisfied. Stronger interaction strength will make the visibility of the dispersion of Higgs mode harder to be observed. We also discuss the dimension effect and find that the signal of the Higgs mode in two dimension is more obvious than that in 3D case. At a large transferred momentum regime, stronger interaction strength will induce the weight of the molecules excitation increasing, while in verse the atomic one decreasing, which shows the pairing information of Fermi superfluid. The theoretical results qualitatively agree with the corresponding quantum Monte Carlo data.
Ecological building design based on the optimization of thermal performance of stilt houses in Guangxi Province
Authors: Jimin Zhong , Jiang He , Xiang Lv 
Published: July 2020

Abstract
Traditional stilt houses in Guangxi Province are ventilated and breathable in summer with good dehumidification and heat insulation performance. In winter, however, their airtightness and thermal insulation abilities are relatively poor. In order to analyze the advantages and disadvantages of the thermal performance of stilt houses in Guangxi Province, this study designs four ecological buildings: Building A is a traditional stilt house with a sloping roof and wooden fences; Building B is a reinforced concrete structured house with a flat roof; Building C is a reinforced concrete structured house with a sloping roof and surrounding self-insulating blocks; Building D has the same conditions as C, except its louvers. Through the Swire energy consumption simulation, we can obtain an ideal multi-layer ecological civil building with a thermal-insulation top layer that can be opened as well as louvers and self-insulating blocks used for the outer wall.
Research of Three-Dimension Design in Infrastructure Project Application
Authors: Lin Xing , Wang Ning , Linjie Chai , Hongmei Zhang , Nan Cheng 
Published: July 2020

Abstract
The three-dimensional design of transmission and transformation projects is a new development trend of State Grid Corporation. This article examines the key technical and management constraints of three-dimensional design of transmission and transformation projects from multiple perspectives, and uses three-dimensional design results to carry out exploration and control of construction process. Accumulate experience from collision testing, simulation construction, cost saving, time saving and dynamic management and control of materials and equipment resources to form a three-dimensional construction management and control measure for power transmission and transformation projects. By building the engineering data platform of Hebei Company, the design-infrastructure-operation and maintenance integration is realized. Provide a platform for storage, display and interaction for data sharing and integration in design, construction and operation. Realize the three-dimensional integration, monitoring and analysis of power grid information. To achieve the goal of comprehensively improving the technical and management level of the design and management of transmission and transformation projects of Hebei Company, and to promote the application of digital results in the design of transmission and transformation projects of Hebei Company.
Sound attenuation performance of periodic expansion chamber mufflers
Authors: Shi Xiaofeng 
Published: July 2020

Abstract
Expansion chamber mufflers are often used for duct noise control of building ventilation systems. In this paper, the periodic arrangement of expansion chamber muffler is proposed to improve the sound attenuation performance. The sound attenuation of periodic expansion chamber mufflers is investigated theoretically with Bloch wave theory and a case is calculated for the distance between mufflers and the length of the expansion chamber are the same. The results reveal that the transmission loss of the expansion muffler is enhanced by the periodic arrangement.
Experimental research on failure mode of reinforced concrete beams under contact explosion
Authors: Wang Huiming , Liu Fei , Wang Jianhui , Yan Luhui , Lv Linmei , Shan Wei 
Published: July 2020

Abstract
In order to research the failure mode of reinforced concrete(RC) beams under contact explosion, experiments were carried out to explore the damage of RC prototype beams fixed at both ends under four TNT charge masses, the damage failure model and damage effect of RC beams under different charge masses were analyzed. The results show that the beam presents three local failure modes: crater damage, collapse, spall failure and punching failure. The degree of local damage has a serious impact on the overall bending deformation of the beam. Besides, reasonable reinforcement could effectively improve the anti-explosion performance of the beam. The research results could provide a theoretical basis for the design of the anti-blast structures and the damage analysis on the structure subjected to explosive action.
Research on synthesis and property of anti-clay polycarboxylate superplasticizer
Authors: Xiong Qiumin , Chen Xiaobin , Dang Wei , Guo Xiujuan , Xu Han , Li Guangzhou , Guan Jican , Huang Xiaohu 
Published: July 2020

Abstract
With isopentenyl polyoxyethylene polyether (TPEG), maleic anhydride (MAH), acrylic acid (AA) and binary ester (DBE) as monomers, hydrogen peroxide (H2O2) as initiator and mercaptoacetic acid (MAA) as chain transfer agent, the anti-clay polycarboxylate superplasticizer (APC) was synthesized. The structure of polymer was characterized by infrared spectroscopy (FTIR) and gel permeation chromatography (GPC). The fluidity of cement paste mixed with montmorillonite (MMT) and the slump of concrete were used as evaluation indicators to investigate its mud resistance and dispersion properties. The results showed that when the content of bentonite (MMT) in the cement was 3% and the content of APC was 0.15% of the cement quality, the initial fluidity of the cement paste was 235 mm and the fluidity in 2 hours was 187 mm. The concrete test was carried out with the machine-made sand with high mud content: the slump flow was 560 mm, and the slump flow was 500 mm after 2 hours. APC has good mud resistance and good dispersion and retention properties.
Seepage control effect of a concrete face rockfill dam on a deep overburden foundation
Authors: Wen Lifeng , Li Yanlong 
Published: July 2020

Abstract
This study addresses the seepage field characteristics of a concrete face rockfill dam (CFRD) built on a deep overburden foundation. The seepage barriers and anti-seepage effect for the dam and foundation are analysed using the finite element method (FEM). Based on the numerical analysis, it is concluded that the anti-seepage wall in the overburden foundation can achieve good anti-seepage effect. A relative depth ratio of 0.7 between the wall and overburden is suggested when a suspended cut-off wall is used. The permeability of the overburden has a significant effect on the foundation seepage field.
Near-surface Temperature Inversion over the East China Sea
Authors: Zhang Zhiwei , Li Yunying 
Published: July 2020

Abstract
Temperature inversion structure affects the boundary layer activity and convective activity. The frequency, strength, and formation mechanism of near-surface temperature inversion are studied using sounding data at three stations over the East China Sea from 2000 to 2015. The results show that the frequency and strength of the inversion are larger in summer (over Cheju station) than in winter (over ROIG station). The inversion is mainly classified as advection inversion over Cheju station, while mainly classified as radiation inversion over ROIG station. Low cloud amount in winter is larger than that in summer over the East China Sea, which is opposite to the inversion frequency. The reason is that the frequent and strong inversions hinder the height of convection in summer, it is difficult for moist air to reach the lifting condensation level and form clouds.
Review and feasibility analysis of prefabricated recycled concrete structure
Authors: Ma X C , Luo W J , Yin J 
Published: July 2020

Abstract
Recycled concrete is a resource utilization technology of building rubbish, which is of great significance to environmental protection and socio-economics. And because prefabricated structure buildings adopt standardized design, factory production, information management, assembly construction and intelligent applications, it can meet the needs of sustainable development. The combination of these two technologies can give full play to the environmental advantages of this structure. This article starts from the three aspects of work performance, mechanical performance and anti-seismic performance, and summarizes the research status and analyzes the feasibility of applying recycled concrete to prefabricated structures to promote the further integration of these two environmentally friendly construction technologies.
Influence of Valve Core Structure on Flow Rate and Internal Flow Field of Pressure Independent Control Valve
Authors: Fan Y L , Wang J , Huang J , Peng L , Li Z 
Published: July 2020

Abstract
To study the influence of valve core structure on pressure independent control valve, based on the computational fluid dynamics method, the 3D model of pressure independent control valve under different control valve core structure is established. Then the influence of different control core structure on valve flow rate under different pressure was studied, the pressure and velocity distribution of the internal flow field are obtained. The results show that, under the same flow characteristics, a maximum flow capacity under different valve core difference of 20%, the pressure and velocity distribution of the internal flow field is different. Reasonable choice of different valve core structures for different working conditions can improve the stability of the flow field in the valve.
Comparative study on calculation methods of wave force on breast wall in Chinese, Japanese and European codes
Authors: Jian Huang , Xiu-min Zhang , Xiao Bing , Li-hong Dong , Yun Peng 
Published: July 2020

Abstract
The stability calculation of breast wall is an important content in the design of slope marine structures. The main damage load of breast wall on rubble-mound breakwater is wave force. In the absence of physical model test data, wave force is often differently calculated according to the methods specified in the different codes and design manuals. In this paper, different calculation methods for wave force based on the codes of China, Japan and Europe are discussed and analyzed. Then, a revetment project in Africa is taken as an example to compare the calculation results. Finally, important conclusions can be obtained that (1) the results calculated by the Chinese code are relatively reasonable; (2) When calculating the wave force imposed on breast wall placed on vertical wall, the Goda’s method in the Japanese code is practicable. As for the relevant calculation of the wave force on slope structures, it can only be used for approximate estimation. (3) In the method of BS6349, the range of K value is relatively large, which has great influence on the calculation results. When using this method, more attention should be paid to the selection of K value. The results can provide a reference for structure design of breast wall without physical model test data.
Research on the Application of BIM + VR Technology in the Project
Authors: Wu Bei , Chen Yanxiu , You Yang , Liu Liping , Gao Zhanwang 
Published: July 2020

Abstract
At present, the research of BIM + VR technology is the forefront of BIM technology application research. BIM technology can solve some design problems and provide collaborative design solutions for various professions. Virtual reality technology (VR) technology can make up for some of the shortcomings of BIM technology BIM technology and VR technology can complement each other and be used in actual engineering projects. For this case, the actual application results show that BIM + VR technology can effectively solve the visualized expression of the integrated design of the interior pipe of the building, the decorative design and management.