bluuebunny/crossref_metadata_2025 huggingface dataset:
Preterite indicative Pseudo-Coordination and morphomic patterns
Authors: Di Caro Vincenzo Nicolò
Published: February 2022

This paper discusses the paradigmatic configuration (or ‘morphome’; Aronoff 1994) that Pseudo-Coordination (V1[TAM.Agr] a V2[TAM.Agr], as in Jivu a ffici la spisa. ‘I went and did the shopping.’) displays in the preterite indicative in Deliano: i.e. the ‘W-Pattern’ (Di Caro 2019a; Di Caro and Giusti 2018). In the first part, the suppletive nature of the preterite paradigm of the V2s licensing this construction is discussed. These V2s all feature perfective roots (i.e. PYTA roots; Maiden 2018b), such as fici ‘I made/did’ and dissi ‘I said’, which are the ones allowed in the construction, and imperfective roots, such as facisti ‘you (sg.) made/did’ and dicisti ‘you (sg.) said’. In the second part, new data from a grammaticality judgment-based study on Pseudo-Coordination in Deliano are discussed, with reference to the emergence of the W-Pattern in a specific paradigm. The results clearly show that this morphome is consistently present throughout the sample (11–80 y.o. participants, N = 140) and has a “psychological reality” (cf. Maiden 2018b: 1–10), in the sense that it does not seem to be affected by variables such as age or gender, or to be subject to ordering effects.
Pseudo-coordination of the verb jít (‘go’) in contemporary Czech
Authors: Škodová Svatava
Published: February 2022

This chapter investigates the use of the verb jít (‘go’) in two construction types in the Czech language; they have in common a binary coordinative structure where the verb jít is coordinated with any other verb with the coordinator a (‘and’). These constructions are prototypical coordination (ProCo) and pseudo-coordination (PseCo). The main claim is that even though these two types share the same surface structure jít-a-V2, they represent distinct phenomena.

The resolution criteria are based on a two-part analysis. First, PseCo is analysed as a complex predicate. This analysis immediately accounts for a number of properties of PseCo compared to ProCo. Second, the formal features of the construction are linked to its semantic structure: PseCo expresses aktionsart via coordination over sub-stages of events.

I argue that ProCo is a biclausal structure coordinating two separate events, while PseCo coordinates two verbs into one complex predicate and the coordinator a (‘and’) serves for a coordination of sub-stages of this combined event. It appears that the first verb expresses the preparatory phase for the activity denoted by the second verb. The pseudo-coordinative verb in the first conjunct lexicalises a manner component in the internal event structure. The verb ‘go’ is desemanticized and instead of the meaning of physical motion expresses dynamic aspects of the second event.

This research is based on 1611 examples from the Czech National Corpus, subcorpus SYN2005, from which 923 examples are analysed as ProCo and 668 as PseCo.
Pseudocoordination and Serial Verb Constructions as Multi-Verb Predicates
Authors: Ross Daniel
Published: February 2022

Verbal pseudocoordination (as in English go and get) is often seen as an idiosyncratic phenomenon described in exceptional terms. This paper establishes the typological context to explain key properties of pseudocoordination, integrated into a more general typology of multi-verb constructions. At the same time, principled motivations are given for the arbitrary list of traditional properties attributed to Serial Verb Constructions (SVCs). The broader category of Multi-Verb Predicates (MVPs) is proposed as any monoclausal multi-verb construction with two verbs forming a complex predicate. Subtypes of MVPs are distinguished by their form: pseudocoordination with a linker ‘and’, while SVCs have no linker. Structural properties of MVPs, such as shared inflectional features on each verb, are readily explained as due to monoclausality.
On the adverbial origin of German modal particles
Authors: Coniglio Marco
Published: February 2022

All German modal particles share important common properties. However, in a diachronic perspective, their
origin has often been explained by assuming that they have grammaticalized from different types of lexemes belonging
to several word classes: adjectives, adverbs, conjunctions, etc. The present paper intends to dissipate some erroneous
assumptions about the grammaticalization paths of modal particles and to offer a novel syntactic approach that
explains their origin and development. By following and elaborating on some recent ideas, I will explore the
hypothesis that modal particles have an adverbial origin and will provide corresponding evidence. In the syntactic
analysis, I will claim that all modal particles originate from specific types of (strong) lower adverb(ial)s that
become weak sentential adverbs under reanalysis.
Outer particles vs tag particles
Authors: Ituarte Aitor Lizardi
Published: February 2022

This article aims to draw a syntactic analysis that accounts for the differing properties of two sets of
discourse particles: Outer (or Final) Particles (OutPs) and Tag Particles (TagPs). In recent years, researchers have
built a syntactic model to accommodate OutPs (Haegeman 2014; Wiltschko & Heim 2016; a.o.), but TagPs have received little attention. In
order to highlight the different nature of these two sets of particles, I will focus on two segmentally homophonous
Basque particles: alaOutP
and alaTag
. After discussing
their distinct prosodic, syntactic and pragmatic properties, I will argue that these particles show structural
differences: while OutPs merge in the right periphery of the clause, TagPs are intransitive X0s and head
their own Speech Act Phrase (SAP).
Anchoring primary and secondary interjections to the context
Authors: Munaro Nicola
Published: February 2022

On the basis of empirical evidence from various Italian dialects, I argue that primary and secondary
interjections lexicalize different functional heads which are computed syntactically at the edge of the clause.
Secondary interjections should be clearly distinguished from primary ones; only secondary interjections lexicalizing a
SpeechAct° head represent autonomous speech acts and are prosodically and syntactically independent from the
co-occurring clause, which they can attract to their specifier position, raising eventually to the adjacent head
Speaker° in order to achieve the necessary spatio-temporal contextual anchoring. Primary interjections, which can
co-occur with secondary ones and surface clause-initially, lexicalize arguably the highest functional head Speaker°,
interacting in interesting ways with lower projections and with the overt realization of the complementizer in
Force.
Meaning and use of the Basque particle bide
Authors: Korta Kepa , Zubeldia Larraitz
Published: February 2022

In this work we study the meaning and use of the Basque particle bide. We contend that,
uttering a bide-sentence, the speaker asserts the proposition she would assert had she uttered a
sentence without bide, but conveys additional evidential and doxastic information. She conveys that
the evidence for the belief she expresses is indirect and that she is not absolutely certain on its truth–although it
seems that the latter is sometimes cancellable. To put it in speech-act theoretic terms, bide is an
illocutionary force indicator with no contribution to the propositional content of the speech act, which imposes to
the assertion a certain preparatory condition and, perhaps, a constraint on the degree of strength of the belief
expressed.
The extravagant dutch suffix -ke and its meandering through the interfaces
Authors: De Belder Marijke
Published: February 2022

The substandard Dutch diminutive suffix -ke occurs in words of four different categories: nouns, predicatively used adjectives, adverbs, and interjections. In nouns, adjectives, and adverbs, the suffix may trigger an epenthetic consonant, which is not available for the interjections. This seems to go hand in hand with a syntactic distinction: for the interjections the suffix is not to be analysed as a diminutive, but as an honorific. I argue that in all contexts, the suffix realises scalar features, but of different natures. The phonological contrasts follow from the extravagant meandering through the syntax-phonology interface.
Linguistic extravagance in compounds and idioms – an analysis of morphological marking
Authors: Bauke Leah S.
Published: February 2022

This paper investigates the role of morphological marking as the driving factor for linguistic extravagance in idioms and compounds in German and English. It argues that formal structural properties of morphological marking alone can account for compounds that are regular, i.e., compositional, productive and recursive, as well as for those that are non-compositional, non-productive and non-recursive and in that sense irregular or extravagant. Furthermore, the paper shows how the formal analysis for compounds can be extended to idioms in German and English, which are similar to compounds in the sense that they display categorial unfaithfulness and non-compositional form-meaning correspondence and yet are different from compounds in that they contain additional functional structure to the structure that can be identified in compounds. The paper draws on the exoskeletal model of Borer (2005a, b, 2013) for the analysis of compounds and idioms, which – unlike other approaches to morphological marking – can account for extravagant as well as expected aspects of these forms strictly in terms of the formal grammatical properties.
Extravagant expressions denoting quite normal entities
Authors: Frankowsky Maximilian
Published: February 2022

Identical constituent compounds (ICCs) are a prototypical example of extravagant morphology. They violate several constraints and rules of German word formation. Speakers use these violations systematically to highlight specific semantic characteristics of the base noun. Mädchenmädchen ‘girl girl’, for instance, refers to a stereotypical girl. So far, the formal features and the usage of these formations have not been described empirically. This study is based on large corpus data to make reliable predictions about features like linking elements, inflectional behaviour, and the spelling of German ICCs. Furthermore, it investigates which strategies speakers use to make sure that the hearer understands what (in most cases) constitutes a newly formed word.
A comparative validation of biodosimetry and physical dosimetry techniques for possible triage applications in emergency dosimetry
Authors: Sholom Sergey , McKeever Stephen W S , Escalona Maria B , Ryan Terri L , Balajee Adayabalam S
Published: February 2022

Large-scale radiological accidents or nuclear terrorist incidents involving radiological or nuclear materials can potentially expose thousands, or hundreds of thousands, of people to unknown radiation doses, requiring prompt dose reconstruction for appropriate triage. Two types of dosimetry methods namely, biodosimetry and physical dosimetry are currently utilized for estimating absorbed radiation dose in humans. Both methods have been tested separately in several inter-laboratory comparison exercises, but a direct comparison of physical dosimetry with biological dosimetry has not been performed to evaluate their dose prediction accuracies. The current work describes the results of the direct comparison of absorbed doses estimated by physical (smartphone components) and biodosimetry (dicentric chromosome assay (DCA) performed in human peripheral blood lymphocytes) methods. For comparison, human peripheral blood samples (biodosimetry) and different components of smartphones, namely surface mount resistors (SMRs), inductors and protective glasses (physical dosimetry) were exposed to different doses of photons (0–4.4 Gy; values refer to dose to blood after correction) and the absorbed radiation doses were reconstructed by biodosimetry (DCA) and physical dosimetry (optically stimulated luminescence (OSL)) methods. Additionally, LiF:Mg,Ti (TLD-100) chips and Al2O3:C (Luxel) films were used as reference TL and OSL dosimeters, respectively. The best coincidence between biodosimetry and physical dosimetry was observed for samples of blood and SMRs exposed to γ-rays. Significant differences were observed in the reconstructed doses by the two dosimetry methods for samples exposed to x-ray photons with energy below 100 keV. The discrepancy is probably due to the energy dependence of mass energy-absorption coefficients of the samples extracted from the phones. Our results of comparative validation of the radiation doses reconstructed by luminescence dosimetry from smartphone components with biodosimetry using DCA from human blood suggest the potential use of smartphone components as an effective emergency triage tool for high photon energies.
A fast and accurate way of evaluating the Widlar current using the Newton–Raphson method
Authors: Mohamed Ahmed Obaid
Published: February 2022

The Widlar current source is one of the basic current sources that undergraduate students encounter throughout their learning process on electronics courses. The Widlar current is actually given in terms of a transcendental equation. Although an analytical solution exists in terms of the Lambert W function it might not be that useful for students during exams or other practical applications. This paper presents a fast and accurate way to solve the problem numerically using the Newton–Raphson method with a regular scientific calculator, and compares the results with the analytical solution given by the Lambert W function.
PJB-Lab: practicing 4C skills in physics practicum
Authors: Firmansyah Juli , Suhandi Andi , Setiawan Agus , Permanasari Anna
Published: February 2022

This article explains how the project-based lab (PJB-Lab) trains critical thinking skills, creative thinking skills, communication skills and collaboration skills (4C Skills) and produces two project products from the application of the fluid concept, namely the application of Archimedes’ law on submarine projects and the application of hydrostatic pressure on the project’s hydraulic pumps (Hydram). This study uses a quasi-experimental method involving 112 students studying at two universities located in the province of Aceh, Indonesia. The results of the study show that 4C skills can be improved well with an increase in the high category. Therefore, PJB-Lab has been proven to be effective in facilitating and training the 4C skills of prospective physics teachers at universities and can be considered for application with students in schools.
Falling faster than g, exponentially
Authors: Cross Rod
Published: February 2022

Calculations are presented showing that the usual ‘faster than g’ demonstration has a surprising property. That is, a rod hinged at its bottom end rotates at an exponentially increasing rate until it falls with maximum vertical acceleration, unlike an object that falls freely by gravity alone. If the rod is hinged at its top end and released from a horizontal position, then the vertical acceleration is a maximum at the instant it is released.
Factors affecting the arterial to end-tidal carbon dioxide gradient in ventilated neonates
Authors: Williams Emma , Bednarczuk Nadja , Dassios Theodore , Greenough Anne
Published: February 2022

Objective. To determine factors which influenced the relationship between blood carbon dioxide (pCO2) and end-tidal carbon dioxide (EtCO2) values in ventilated, newborn infants. Furthermore, to assess whether pCO2 levels could be predicted from continuous EtCO2 monitoring. Approach. An observational study of routinely monitored newborn infants requiring mechanical ventilation in the first 28 d after birth was undertaken. Infants received standard clinical care. Daily pCO2 and EtCO2 levels were recorded and the difference (gradient: ∆P-EtCO2) between the pairs were calculated. Ventilatory settings corresponding to the time of each blood gas assessment were noted. End-tidal capnography monitoring was performed using the Microstream sidestream Filterline H set capnograph. Main results. A total of 4697 blood gas results from one hundred and fifty infants were analysed. The infants had a median gestational age of 33.3 (range 22.3–42.0) weeks and birth weight of 1880 (395–5520) grams. Overall, there was moderate correlation between pCO2 and EtCO2 levels (r = 0.65, p < 0.001). The ∆P-EtCO2 for infants born less than 32 weeks of gestation was significantly higher (1.4 kPa) compared to infants born at greater than 32 weeks of gestation (0.8 kPa) (p < 0.001). In infants born at less than 32 completed weeks of gestation, pCO2 levels were independently associated with EtCO2, day after birth, birthweight and fraction of inspired oxygen (FiO2) (model r
2 = 0.52, p < 0.001). Significance. The results of end-tidal capnography monitoring have the potential to predict blood carbon dioxide values within the neonatal population.
Thermoelastic responses in a nonlocal infinite solid with a circular cylindrical cavity due to a moving heat supply under the MGT model of thermal conductivity
Authors: Mohammed Wael W , Abouelregal Ahmed E , Atta Doaa , Khelifi F
Published: February 2022

Since the non-local continuum theory includes additional information regarding the long-range forces of molecules and atoms, the external length scale parameter may be included in the formulation of physical and engineering modeling. In this study, a new non-local thermoelastic model is presented in which the size-dependent effect has been included in the equations of motion and constitutive relations. To establish the proposed generalized model of heat conduction, the Moore-Gibson-Thompson concept was used. As an application to the presented model, a problem of thermally induced behavior in an infinite nonlocal solid with a cylindrical hole whose surrounding surface is free of traction and affected by a time-dependent moving heat supply is studied. In the transformed field of the Laplace transform, analytical formulas for thermophysical fields have been derived. To obtain the numerical results of the physical field, an approximate approach was applied to find the numerical inversion. The effect of non-localization and heat source velocity on the responses of the investigated fields is graphically illustrated and discussed in detail. The results show that Eringen’s non-local elasticity model is a promising criterion for analyzing nanostructures, taking into account the effect of small size.
Recovering a source term in the higher-order pseudo-parabolic equation via cubic spline functions
Authors: Huntul M J
Published: February 2022

In this paper, we considered an inverse problem of recovering the space-dependent source coefficient in the third-order pseudo-parabolic equation from final over-determination condition. This inverse problem appears extensively in the modelling of various phenomena in physics such as the motion of non-Newtonian fluids, thermodynamic processes, filtration in a porous medium, etc. The unique solvability theorem for this inverse problem is supplied. However, since the governing equation is yet ill-posed (very slight errors in the final input may cause relatively significant errors in the output source term), we need to regularize the solution. Therefore, to get a stable solution, a regularized cost function is to be minimized for retrieval of the unknown force term. The third-order pseudo-parabolic problem is discretized using the Cubic B-spline (CB-spline) collocation technique and reshaped as non-linear least-squares optimization of the Tikhonov regularization function. Numerically, this is effectively solved using the lsqnonlin routine from the MATLAB toolbox. Both perturbed data and analytical solutions are inverted. Numerical outcomes are reported and discussed. The computational efficiency of the method is investigated by small values of CPU time. In addition, the von Neumann stability analysis for the proposed numerical approach has also been discussed.
Impact of strain on the electronic, phonon, and optical properties of monolayer transition metal dichalcogenides XTe2 (X = Mo and W)
Authors: Islam Md Rasidul , Mojumder Md Rayid Hasan , Moghal Biazid Kabir , Islam A S M Jannatul , Miah Mohammad Raza , Roy Sourav , Kumar Anuj , Shihavuddin A S M , Ashique Ratil H
Published: February 2022

Here, we provide a systematic assessment of biaxial strain effects on the electronic, phonon, and optical properties of monolayer transition metal dichalcogenides (TMDs) XTe2 (X = Mo and W) using density functional theory calculations. We observed a large direct bandgap of 1.163 eV and 0.974 eV for MoTe2 and WTe2, which reduced to 1.042 eV and 0.824 eV in the spin–orbit coupling ambient. The XTe2 structures show a tunable bandgap with the variation of the applied biaxial strains. Due to the breaking of inversion symmetry, a large spin-valley coupling emerged at the valance band edges for both MoTe2 and WTe2 monolayers under applied biaxial strain. The phonon properties with different biaxial strains reveal that monolayer MoTe2 is more stable than the WTe2 structure. The calculated optical properties demonstrate that the dielectric constant and absorption coefficient of MoTe2 and WTe2 move to higher photon frequencies when the compressive strain is increased. On the other hand, with the increase in tensile strain, a red-shift behavior is found in the calculated optical properties, indicating the suitability of the XTe2 monolayer for different infrared and visible light optical applications.
A ship target dynamic recognition method based on image recognition and VR technology
Authors: Fei Peng , Chu Xiumin , Geng Xiongfei , Luo Jianan
Published: February 2022

Effective identification of ship identity is an important means of water traffic management. Aiming at the technical limitations of AIS, radar and other means, a ship automatic recognition method based on machine learning is proposed, and a water traffic visualization system integrating multi-source recognition technology is realized based on VR technology. The test shows that the method and system can solve the technical problems of ship identification caused by data easy to be tampered with, difficult to distinguish massive targets and large obstacles, and provide an effective method for navigation support in key waters.
Research on Abnormal Event Classification of Expressway Tunnel based on Security Control
Authors: Hu Jiangbi , Zhang Zechao , Cao Qingyun , Qu Shangwen , Wang Ronghua
Published: February 2022

Based on the perspective of tunnel traffic safety operation and control and the human, vehicle, road, and environment system in tunnel operation process, adopting event tree analysis method according to the different influencing factors, generation mechanism and performance characteristics of tunnel abnormal events, this research propose abnormal event classification tree diagram. According to the current abnormal event management and control mechanism in China, the administration departments and disposal facilities associated with different types of abnormal events in expressway tunnel operation are sorted out, which can provide decision-making support for the rapid treatment of abnormal events and realize intelligent control of tunnel.
A Feature Extraction Method for Non-intrusive Load Identification
Authors: Wei Wei , Peng Tao , Ye Li , Feng Xianyu , Jiang Zisong , Yu Heyang
Published: February 2022

When some household appliances are running, the electrical quantities such as active power and reactive power will change slowly for a long time, which will affect the feature extraction of event-based non-intrusive load identification, resulting in low accuracy of load identification results. In view of this situation, a feature extraction method is proposed. Its core idea is that there is a certain law in the change of active power and reactive power in a very short time, and the curve can be fitted to speculate the values of these electrical quantities in the next time, so as to eliminate the influence. Based on this, a feature extraction method applied to non-intrusive load identification is realized. The test results show that this method can effectively improve the accuracy of non-intrusive load identification feature extraction data, and has good application value.
Study on Thermal Runaway Behavior of Lithium Ion Battery under Overcharge Using Numerical Detecting Method
Authors: Gao Ao , Dong Wenhui , Xu fang , Xu Xiangyang , Fan Lei
Published: February 2022

In order to provide support for the early warning model of thermal runaway of lithium-ion battery, the thermal runaway behavior of power lithium battery is studied by analyzing the charging current, voltage and other parameters of lithium-ion power battery under overcharge condition. In addition, the morphological changes of battery before and after thermal runaway are compared. It is found that under the conditions of this study, overcharging for 58 minutes will lead to thermal runaway of full load lithium-ion battery. In the early stage of thermal runaway, the leakage gas in the battery box will continue to increase, which is 1339 ppm in the First Level early warning, 3405 ppm in the Second Level early warning and 8292 ppm in the Third Level early warning.
Optimal operation method of integrated energy system considering thermal inertia
Authors: Wang Yongli , Liu Zhen , Cai Chengcong , Shen Hekun , Chen Xin , Yang Yang
Published: February 2022

This paper proposes a comprehensive energy system operation optimization method considering the thermal inertia of the heating system. Firstly, based on the energy network of the integrated energy system, establish the thermal inertia and heat storage model of the heating pipeline; secondly, the goal is to minimize the total operating cost of the electricity-heat-gas integrated energy system. Considering constraints such as power balance and safe operation of equipment, an integrated energy system operation optimization model based on thermal inertia is established; the results show that the model can better balance scheduling cost and reliability.
Research on Standards for Information Supportive System in District Energy Internet Construction
Authors: Wang Decheng , Li Yan , Zhang Qun , Chen Qian , Feng Mengshuang , He Xiaotong
Published: February 2022

At present, the concept of Energy Internet has attracted great attention around the world, and is generally considered to be an important means to realize carbon neutrality. In terms of the overall structure, the Energy Internet is composed by physical network system, information supportive system, and value creation system. As is known to all, the information supportive system is the nerve center of the Energy Internet. While to establish the information supportive system of the Energy Internet, standards and specifications are in urgent need. Therefore, this paper mainly focuses on standards for information supportive system in the Energy Internet construction. First, the overall structure of the information supportive system is proposed. Then, the functional characteristics of each layer in information supportive system are analyzed respectively. In addition, the existing standards for information supportive system are summarized. Meanwhile, standards that need to be formulated in the future are analyzed as well. Finally, suggestions are given for the formulation of construction of information supportive system in the Energy Internet.
The Auxiliary System of Video Surveillance in Smart Substation
Authors: Liu Yu , Zhang Chao
Published: February 2022

With the continuous development of artificial intelligence technology, the current substation operation and maintenance personnel have more and more urgent needs for the visualization, remoteness and intelligence of the operation and maintenance system. In order to solve the existing problems and present situation, key technologies such as image acquisition, image recognition, and visual display are studied. A smart substation video monitoring auxiliary system was developed. The system is used advanced cameras and acquisition equipment to monitor and detect related electrical equipment such as hard pressure plate switches in the substation in real time. The goal of intelligent inspection is achieved. In the smart substation project, it has achieved good results and has a wide range of application prospects.
Performance analysis of EES-based transcritical carbon dioxide two-stage compression/ejector refrigeration system for shipboard cold chambers
Authors: Li Yang , Yang Dazhang , Zhang Qing , Xie Jing
Published: February 2022

Carbon dioxide (CO2) as a natural refrigerant has a broad application prospect in the refrigeration system of shipboard cold chambers. In this work, a novel transcritical CO2 two-stage compression refrigeration system equipped with a two-phase ejector for shipboard cold chambers is proposed. At the same time, simulation of the two-phase ejector and the system was carried out by Engineering Equation Solver (EES). Additionally, The effects of high pressure stage exhaust pressure, intermediate pressure and evaporating temperature on system performance were also investigated. The results showed that the system COP increased with the evap-orating temperature increased from -35°C to -25°C. The system COP decreased with the increase in exhaust pressure, when the evaporating temperature is maintained at -35°C. The optimal intermediate pressure is 4.75 MPa, when the evaporating temperature is fixed at -35°C.
The research of Dual MOSFET Parallel technology in Servo drive power
Authors: Ping Zengliang , Wu Shaonan , Ma Yuhua
Published: February 2022

With the development of science and technology, the capacity of high-power power electronic conversion equipment is increasing. The growth rate of current carrying capacity of power electronic converter is lower than that of capacity of high-power power electronic converter. Therefore, the parallel technology of power electronic devices is gradually emerging. In this paper, a double MOSFET parallel technology is proposed, and the feasibility of the scheme is verified by simulation. The scheme can be used in the internal control power supply of power electronic conversion equipment such as driver to realize reliable operation without external control power supply.
Dynamic Analysis and Model Predictive Control of Excavator’s Working Device
Authors: Zheng Penglong , Liu Jian , Wu WeiWei
Published: February 2022

Aiming at the development requirements of automation and intelligence of traditional hydraulic excavator, the robot modeling theory is applied to the modeling process of it, and the general forward and inverse kinematics models of excavator working device including the hydraulic drive structure were given. Based on Lagrange equation, the dynamics model of excavator is established, and a trajectory tracking control method is proposed for this model. The tracking effect of model predictive control method on preset trajectory under different working conditions is studied by computer simulation technology. The research results show that the model predictive control can give a more accurate feedforward control force under complex working conditions, realize accurate tracking of the trajectory, and effectively reduce the control delay caused by large inertia working conditions, and has good robustness.
Research about the on-line system for monitoring the geological subsidence of transmission tower based on high-precision positioning of Beidou
Authors: Cui Zhimei , Huang Zhidu , Tan Siyuan
Published: February 2022

This article proposes an innovative method to achieve Beidou high-precision positioning. Then, the online monitoring physical information system of transmission pole tower is constructed with Beidou high precision positioning and inclination measurement information as the data source. The perception layer is Beidou high-precision positioning sensor and inclination measurement sensor, the data transmission layer is the way of combining wireless private network with wired private network, and the application control layer is the data processing center, which presents the results of analyzing sensor data to the user in a visual interface. The system can send an early warning message to the user at the very early stage of the deformation of the transmission pole tower, So that the user can take measures in time.
Optical FBG-T Based Fault Detection Technique for EV Induction Machines
Authors: Cao Wenping , Alalibo Belema P. , Ji Bing , Chen Xiangping , Hu Cungang
Published: February 2022

Electric vehicles (EV) represent a key technology to achieve a low-carbon transportation objective, whist induction motors are one of the promising topologies. The reliability of these machines is crucial to minimize the downtime, cost and unwanted human lives. Although several techniques are utilized in the condition monitoring and fault detection of electrical machines, there is still no single technique that provides an all-round solution to fault detection in these machines and thus hybrid techniques are used widely. This paper presents a novel non-invasive optical fiber technique in condition monitoring of induction machines and in the process detecting inter-turn short circuit faults. Owing to optical fiber’s immunity to magnetic flux, a composite FBG-T sensor formed by bonding a giant magnetostrictive transducer, Terfenol-D, onto a fiber Bragg grating is utilized to sense machines’ stray flux as a signature to determine the internal winding condition of the machines. A tri-axial auto datalogging flux meter was used to obtain the stray magnetic flux and test results obtained via LabView were analyzed in MatLab. Experimental and numerical results agree with each other and how that the FBG-T sensor accurately and reliably detected the short-circuit faults. Bragg shifts observed under short-circuit faults were in 100s of picometre range under various operating frequencies compared to the mid-10s of picometre obtained under healthy machine condition. These provide much promise for future EVs.
Development of SF6 Gas Pressure Prediction Device in Substation
Authors: Lin Xicheng , Wang Hua , Qin Zheng , Zhao Wendong , Li Xiangchong , Yang Xiaojie
Published: February 2022

SF6 equipment has leakage due to various reasons. The longer the equipment operates, the more serious the leakage is. When the equipment gas leaks to the set air replenishment value, the air replenishment alarm signal will be sent. It can be seen from the SF6 gas temperature pressure relationship table that the temperature change has a great impact on the pressure value. Although the equipment popularizes the SF6 density meter or SF6 density relay with temperature compensation, the compensation system needs to achieve temperature compensation through a long time, resulting in the distortion of the pressure value counted by the operation and maintenance personnel. Therefore, the temperature difference between winter and summer is large, and more alarm signals are obtained. At this time, there are great potential safety hazards in air replenishment. This paper introduces in detail a SF6 gas leakage prediction device in substation, which can effectively solve the above problems in substation.
Power output control method of small power photovoltaic grid connected power generation under complex illumination
Authors: Luo Yun , Lu WenLing
Published: February 2022

Due to the irregular change of lighting conditions, there is a large error in the control of photovoltaic grid connected power output. Therefore, this paper proposes proposes a power output control method for low-power photovoltaic grid-connected power generation considering complex illumination. Based on the analysis of the basic characteristics of photovoltaic grid connected power generation, the output characteristics of photovoltaic array under complex lighting conditions are studied. Combined with its variation characteristics, based on fuzzy control strategy, the output of photovoltaic grid connected energy storage system is adjusted by filter control with variable time constant, and economic operation and stable operation are taken as constraints. The test results show that the design method has a high degree of fit between the control of photovoltaic grid connected power output and the actual results, and the error is within a reasonable range, which is obviously due to the two groups of comparison methods.
Cooperative Control Mechanism of Key Objects and Key Nodes in Container Terminals
Authors: Shi Hankun , Wang Xuelin , Zhou Hongmao
Published: February 2022

This research starts from the operation process of the container terminal, constructs a technical route for the analysis of key objects and key nodes, summarizes the specific distribution of key objects and key nodes of the container terminal, and analyzes the process mechanism and interactive information of the container terminal. The cooperative control mechanism of key objects and key nodes creates a certain theoretical framework for the automation and intelligent design of container terminals.
Discussion on Power System Modeling and Body Optimization of High-speed Electric Vehicle
Authors: Wu Zexu , Zhao Guangfu , Li Guangxue
Published: February 2022

This paper analyzes the operation mode of high-speed electric vehicle power system, combining with the key points of high-speed electric vehicle power system modeling, including controller (VCU) model, engine model, motor model, power battery model, clutch model, wheel model, power loss model, etc. By studying multi-objective optimization processing, applying genetic algorithm, optimizing variable selection, optimizing problem description, defining constraints, optimizing result analysis, etc., its purpose is to improve the content of high-speed electric vehicle power system and promote the stable development of electric vehicle industry economy.
The Design of Intelligent Spray Painting System for Ship Panel Based on UAV
Authors: Wei Yu , Tang Ying , Zou Tian , Li Xue , Zhao Wei , Zhou Honggen , Liu Jinfeng
Published: February 2022

This paper proposes a new form of using UAVs to carry spray painting process equipment to spray outer plates of ships, which solves the paining points of poor practicality, poor versatility and low intelligence of existing robotic spray painting and has received wide attention from experts in the industry. It includes two types of hardware equipment and three software systems, among which the hardware equipment includes intelligent spray painting platform and material supply platform, and the software system includes intelligent planning system of spray painting path, intelligent spray painting stability control system and “double platform” dynamic joint control system. Through experimental verification, the intelligent spray painting system of ship outer plate based on UAV proposed in this paper realizes intelligent spray painting of ship outer plate, improves safety, economy and efficiency of ship outer plate spray painting, and further promotes intelligent transformation of ship construction and high-quality development of ship industry.
Research on vibration isolation and noise reduction technology for the metro depot
Authors: Peng Guangzhao , Fu Kun , Li Zhuang , Ba Jian , Huang Zhibin , Zeng Zhiping , Yin Huatuo , Tang Qihui
Published: February 2022

Under the situation of increasingly tight land resources, the development of depot superstructures has been applied in many cities.The noise generated by the passage of subway vehicles and the vibration of buildings are problems that need to be solved urgently. The use of vibration and noise reduction measures for the track is an important solution.In order to study the vibration reduction effect of the depot vibration reduction measures, taking the Guangzhou Metro Chentougang Depot as an example, the vibration and noise reduction technology of the depot is studied.The research results show that: (1) It can be seen from Table 1 and Table 2 that after the vehicle speed is corrected to the same speed, the Z vibration level of the trapezoidal sleeper section at the foot of the ballast slope is lower than that of the ordinary transverse sleeper section, and the train speed is 10km/h (low speed). The insertion loss VLZ is 8.24dB, and the insertion loss VLZ is 8.53dB under the train speed of 35km/h (high speed).(2) At the measuring point 7.5m away from the centerline of the track, the Z vibration level of the trapezoidal sleeper section is smaller than that of the ordinary transverse sleeper. The insertion loss VLZ under low-speed conditions is 8.60dB, and the insertion loss VLZ under high-speed conditions is 8.93dB.
Numerical simulation of flow field of molten steel in the caster mould
Authors: Li Xin , Li Hao , Tao Chenggang , Zhang Guoqing
Published: February 2022

In order to analyse the molten steel flow in the mould, a 2D model including the mould and the SENwas established. The fluctuation of molten steel on the meniscus of the mould and the steel flow velocity field in the mould and nozzle were analyzed. The calculation results show that: (1) the steel flow velocity field in the mouldwas the highest in the nozzle area. When liquid steel flows out of the SEN, its flow velocity decreases gradually. (2) There were three regions flow in the mould. There were two reflux areas outside the nozzle, the dividing line is the free surface, and the other reflux area is 0.2 m∼0.9 m. The liquid steel within 0.9 m∼1.5 m flows vertically downward. (3) The free surface near the nozzle is high, while the free surface away from the nozzle is low. The free surface is the lowest at 0.1 m and the highest at 0.06 m.
Research on Ultrasonic-Assisted Grinding Process of SiCp/Al Composites
Authors: Zhu Chuanmin , Tao Zhan , Gu Peng , Yu Yiqing
Published: February 2022

SiCp/Al is a kind of particle reinforced composites with good material properties, which can be used in the field of lightweight parts and electronic packaging. Ultrasonic- assisted grinding process is one of the processes which is suitable for machining hard and brittle materials, the surface quality can be improved by using appropriate ultrasonic-assisted process parameters. In this paper, the ultrasonic-assisted grinding process is used to improve the surface quality of SiCp/Al, meanwhile, the kinematics of abrasive particles in grinding is analysed to explain the effect of ultrasonic vibration. In addition, ultrasonic-assisted grinding experiment of SiCp/Al is conducted, it is found that the axial ultrasonic vibration can improve the surface quality of SiCp/Al in grinding, and the reduction percentage is up to 8.20% compared to the normal grinding. In addition, a regression model is proposed for surface roughness prediction, the result of t-test on the residuals shows that the model is accurate.
Research on Friction Characteristics of Reinforced-soil Interface under Various Pull-out Rate and Embedded Length
Authors: Zhao Yunfei , Yang Guangqing , Wang Zhi , Liang Xunmei
Published: February 2022

In highway engineering, the reinforced soil structure has been widely used, especially the reinforcement on the top of the roadbed, which can effectively prevent the pavement from cracking. The friction characteristic of the reinforced soil interface is a necessary part in the design of the reinforced soil structure. In order to study the friction characteristics of biaxial geogrid-soil under various pull-out rate and embedded length, based on self-developed test equipment, a series of pull-out tests were carried out by using the research method of controlled strain. The test results indicated that the pull-out rate has little impact on the shear strength of the reinforced soil. Moreover, the pull-out force increased with longer embedded length. The rest results have provided a reference to the design work using biaxial geogrid in the field of civil engineering, especially in highway engineering.
Research on Measurement Methods of Friction Coefficient
Authors: Cao Hongjun , Xu Zijian , Hu Yinjie , Zhong Minjia , Liu Sheng
Published: February 2022

The concept and classification of the friction coefficient are introduced by the slope method and the plane method. In general, the development trend of friction coefficient measurement methods can be summarized as three characteristics: from simple to complex, from rough to precision, and from single function to platform integration. It also suggests the direction of friction coefficient measurement.
Machining factor on the high cycle fatigue life of X80 pipeline steel
Authors: Qiu Yu , Ju Xinhua , Meng Yang , Wang ZeYang , Zhang Qingshui
Published: February 2022

Pipeline steel is used to make long pipes transporting fossil oil and natural gas, and the stability of its fatigue life is important to evaluate the pipeline service reliability. However, a fatigue life scatter often occurs at low stress amplitudes in X80 pipeline steel. In this investigation, the possible influencing factors have been studied with observation on the fatigue fracture morphology, microstructure and dislocation pattern, and analysis on the distribution of micro-Vickers hardness. It is found that the remaining transverse machining marks greatly affects the fatigue lives at low stress amplitudes. It is mainly because the critical threshold stress factor is greatly influenced by the depth of transverse machining mark. Removing the remaining transverse marks totally as much as possible can greatly improve the fatigue life scatter.
Research on Flow Distribution Characteristics of CFD-based Heat Exchanger Integration Scheme
Authors: Wang Yun , Liu Chao , Yang Yifei , Guo Chenxin , Zeng Yu
Published: February 2022

The modular integrated design of the five heat exchangers of the air conditioning system, auxiliary cooling system, and air quasi system in the aircraft’s environmental control system resulted in three solutions: comprehensive plan 1, comprehensive plan 2, comprehensive plan 3; In this paper, Ansys software is used to model and mesh the three integrated design schemes of heat exchangers; To simplify the mesh model of the entire runner, this article first briefly describes the assumptions, equations and calculation principles of using porous media to replace the heat exchanger model, secondly, the porous media and other settings are performed in Ansys to calculate the flow distribution characteristics of the three heat exchanger integrated design schemes under multiple working conditions.
The forest recovery path after drought dependence on forest type and stock volume
Authors: Luo Hui , Zhou Tao , Yu Peixin , Yi Chuixiang , Liu Xia , Zhang Yajie , Zhou Peifang , Zhang Jingzhou , Xu Yixin
Published: February 2022

Drought legacy effects of forest ecosystems have been widely observed. However, the influence of forest type and stock volume on its recovery path is poorly understood. In this research, we first used the Standardized Precipitation Evapotranspiration Index to identify a drought event. Then, we applied the normalized difference vegetation index deficit and forest property maps derived from forest inventories to investigate the potential impacts of forest properties on forest recovery paths. The results showed that the legacy effects 1–3 years after a drought event were pervasive, but the forest recovery path was highly dependent on the forest type and forest stock volume. The recovery of forests with low stock volume densities (<60 m3 ha−1) was mostly stronger than that of forests with high stock volume densities (≥60 m3 ha−1) by the second year. Although all forests with different stock volume densities approximately returned to a normal status by the third year, they followed various paths to recovery. Natural coniferous forests in China that have a similar stock volume density (<60 m3 ha−1) took longer to recover than planted coniferous forests and exhibited a lower magnitude of recovery. These findings highlight that drought legacy effects are greater for natural coniferous forests with high stock volume densities, which provides insightful forest management information on how to speed up forest recovery with forest density control and type control.