bluuebunny/crossref_metadata_2025_split huggingface dataset:
Effect of Resonance Interference on MEMS Gyroscopes and Filtering Algorithm Elimination
Authors: Wu Junjie , Sun Yufei , Guo Peng , Feng Lihui , Zhang Yongbin , Zhang Youqi 
Published: April 2022

Abstract
The mechanical structure of MEMS gyroscope is a spring-mass-damper system, which is susceptible to interference near the resonant frequency. This work compared the interference effects of mechanical vibrations and high frequency sound waves on MEMS gyroscopes. Three MEMS gyroscopes ADXRS620 were interfered by vibrations and sound waves near the resonant frequency. The error outputs increased linearly with the increase of interference intensity. The maximum error output could reach 88.95 °/s, which seriously affect the normal operation of the gyroscope. The waveforms of gyroscope outputs under acoustic and vibration interference were almost coincident, which showed the similarity of acoustic and vibration interference. However, to produce the same effect on gyroscopes, the power required of vibration interference was much less than that of acoustic interference. Taking one of the gyroscopes for example, when the SPL of acoustic interference was up to 90 dB, the maximum error was only 3.37 °/s. But when the acceleration amplitude of vibration interference reached 0.050 g, the maximum error was 3.42 °/s. In addition, the effectiveness against vibration interference of the filtering algorithm based on orthogonal demodulation was verified by testing the self-developed gyroscope. Vibration interference could be reduced by 98.88% at most.
Distributed Incentive Mechanism Based on Hyperledger Fabric
Authors: Li Baohui , Fang Yadong , Xu Wei , Wang Jiaxing , Rui Lanlan , Lei Min 
Published: April 2022

Abstract
Crowd sensing is a new type of data acquisition method that can efficiently and diversify the realization of sensing tasks. However, this method currently has some problems, such as data storage being overly dependent on third-party platforms, and there is a lack of reliable data credible evaluation methods. To solve this problem, our paper proposes a distributed incentive mechanism based on Hyperledger Fabric (HF-DIM) in the Crowd sensing scenario. In particular, the following questions are studied: How to achieve distributed incentive to solve the traditional incentive that relies on a centralized platform? How to evaluate the credibility of the sensing data provided by the users? To the former question, we implement a multi-attribute auction algorithm based on smart contracts, and distributed incentives are implemented using blockchain deployed contracts. To the latter question, We propose a K-nearest neighbor outlier detection algorithm based on geographic location and similarity to evaluate the credibility of the data and establish a reputation index based on the credibility of the data. Through simulation experiments using real data set, the feasibility and effectiveness of the proposed framework and algorithm are verified.
An Improved Genetic Algorithm for the Uncapacitated Facility Location Problem and Applications in Oil and Gas Fields
Authors: Zhou Jun , Wang Xuanqing , Zhang Lulu , Zhou Xuan , Jing Siqi , Liang Guangchuan 
Published: April 2022

Abstract
Uncapacitated Facility Location Problem (UFLP) is a NP-hard Problem that to determine the optimal Location of facilities. In this paper, the general Genetic Algorithm (gGA) is first introduced and adopted to solve a small case of UFLP (case1). Then an improved genetic algorithm (iGA) based on real coding is proposed to solve the UFLP problem. This paper mainly makes appropriate adjustments in the selection of fitness function, crossover operator and mutation operator to be more suitable for UFLP. Facilities thus can be roughly allocated according to the cost of facilities and the demands of customers. Case2 was calculated by several CAP data (CAP101, CAP103, CAP104, CAP131, CAP133, CAPB and CAPC) in OR-LIBRORY. The results proved that the iGA is feasible and effective, and it is found that 80% of the results obtained by the iGA are within 0.05% of the optimal solutions. Compared with several other common algorithms, the advantages of iGA increase as the scale of calculation increases. Finally, applying iGA to an on-site oilfield pipeline network, it was found that it can find the optimal solution in a short time.
A Two-stage Successive Approximation Method of Dynamic Programming for Operations of Cascaded Hydropower Plants with Navigation Demand
Authors: Shao Qizhuan , Wang Mingbo , Liu Shuangquan 
Published: April 2022

Abstract
The operations of cascaded hydropower plants have always been recognized as a complex system optimization problem. The difficulty of modelling and optimization solution is further aggravated when comprehensive water demands for power generation, navigation and ecology are considered. This study develops an optimization model for operations of cascaded hydropower plants with navigation demands, and proposes a two-stage successive approximation method of dynamic programming. In the model, the navigation demand is considered as a constraint. The first stage is to optimize the operation of cascaded hydropower plants with no consideration of navigation demand. The optimized result is taken as an initial solution of the last stage. Moreover, the navigation constraint is introduced in the solution procedure to obtain a reasonable operation scheme. The method is implemented on operations of a cascaded hydropower plants with navigation task in Southwest China. The results show that the navigation demand can be satisfied by coordination of cascaded hydropower plants. Moreover, this constraint has an effect on the monthly distribution of total energy production during one year. In addition, the computing efficiency and solution accuracy are analysed by using different discrete steps.
Structural and thermal properties of InSb:Mn with MnSb clusters
Authors: Durante Rincón C A , González-Laprea J , Mendoza Oliveros M E , Castro J A , Quintana E , Fermín J R 
Published: April 2022

Abstract
III-V family compounds doped with transition metals are promising materials for spintronic applications. Synthesis of an In0.9Mn0.1Sb ingot was thus carried out by direct fusion of the stoichiometric mixture of the constituent elements, followed by controlled cooling. The ingot obtained showed p-type conductivity. Scanning Electron Microscopy (SEM) images show MnSb clusters in an InSb matrix doped with Mn, a result like that found when the compound is obtained using other techniques. Energy-dispersive X-ray spectroscopy (EDS) shows that the atomic ratio of the clusters is Mn/Sb = 0.896 ± 0.025, while the atomic ratio of the matrix is In/Sb = 1.013 ± 0.005. The indexation of the powder X-ray diffraction pattern at room temperature yielded a majority cubic phase of InSb doped with Mn, with a lattice parameter a = 6.474173 Å and cell unit volume V = 271.36Å3
, while non-indexed reflections are associated with the presence of MnSb rich in Sb. The phase transition temperatures were obtained from differential thermal analysis (DTA) measurements on powder samples in evacuated quartz capsules. It can be observed that fusion of the InSb matrix doped with Mn occurs between 485 °C and 528 °C, unlike the congruent fusion of the InSb at 527.7 °C; while the fusion of the Sb-rich MnSb clusters occurs between 494 °C and 509 °C. These temperatures are lower than those reported for the Sb-rich side of the phase diagram of the Mn-Sb binary system, which shows a decrease in the thermal stability of the compounds. The estimated fusion enthalpies for InSb:Mn and antimony-rich MnSb are, respectively, 4.8 Kcal/mol and 117.4 Kcal/mol.
Polarization and biomineralization of hydroxyapatite-barium titanate composites
Authors: Uribe R , Rojas I , Riofrio M C , Lascano L , González G 
Published: April 2022

Abstract
In the search of new materials for bone regeneration, the materials with piezoelectric properties look very promising. It has been reported that piezoelectric materials induce bone growth and enhance implant integration. Additionally, it has been found that bioactivity increases in negatively charge surfaces such as polarized BaTiO3 (BT) and polarized hydroxyapatite (HAp). Additionally, it is known that BaSO4 (BS) increases biocompatibility. Therefore, in this work, composites materials of 80BT/20BS (BTS) in different proportions with HAp (HAp/BTS: 10/90, 30/70, 50/50, 70/30 y 90/10) were prepared by a mixture of nanometric powders and then they were sintered at 1000 °C for a period of 5 h. The materials were polarized at 130, 300 and 400 °C applying a DC electric field of 1 kV/mm, during 1 h. The electric field was maintained until the material was cooled down to room temperature. The electric and piezoelectric response were measured immediately after cooling, after 1 h and after 24 h. The dielectric measurements of materials were performed at different frequencies (0.1 to 100 kHz). The polarized and unpolarized materials were immersed in simulated body fluid (1.5 SBF) for 7 and 19 days. The deposition and growth of hydroxyapatite using the biomimetic method was followed by FTIR and SEM. The polarization effect on the crystalline growth of hydroxyapatite formed from the SBF solution has been demonstrated. The process of biomineralization of HAp on HAp/BTS composites increased considerably with the addition of barium titanate, this effect greatly improved in polarized materials. The typical coral-like morphology characteristic of HAp formation from SBF deposition was observed after 7 days of SBF immersion for polarized composites. Excellent dielectric properties were determined by adding 30% Of BaTiO3, obtaining for these composites dielectric constant values of the order of 20 to 10 kHz, values similar to that of human bones. Therefore, these materials look very promising for bone regeneration.
Dust adhesion physics on photovoltaic surfaces and its application on assisted natural cleaning of solar trackers
Authors: Cruz G A , Vorobiev P 
Published: April 2022

Abstract
Soiling is a problem that affects energy production of solar panels. Dust particles are deposited on the surface of the panel by the wind currents. Adhesion occurs due to Van der Waals forces, depending on the contact area of the tempered glass surface with the dust particle, due to gravitational force acting on the mass of the particles, and due to capillary forces, which are increased with the amount of humidity, depending on the climate. In this project, the positioning capabilities of a solar tracker were used to achieve better assisted natural washing under conditions of weak and heavy rain, using a “passive cleaning” when the rain is intense and an “active cleaning” when the rain is weak. For passive cleaning, the effect of varying the inclination angle while washing and drying was studied and quantified, analysing the formation of stains generated by raindrops drying. It was evident that the higher the angle of inclination the greater the effect of gravity on the drops, facilitating their sliding and falling off the panel, however, it was found that it is possible to carry out passive cleaning at an angle of inclination that does not require prominent deviation from the angle that fits the position of the sun, in fact, it is enough with an inclination angle of 30° to achieve an effective passive cleaning process. In active cleaning, a rocking movement is performed by varying the angle of inclination of the solar tracker with values of + θ and -θ, which increases the contact time of the raindrops with the surface of the solar panel, allowing a better sweep of dust particles and therefore a more complete washing even in light rain conditions. Active cleaning improves the results in surface cleaning in almost 57% when compared to passive cleaning, in light rain conditions.
Developments for enhancing the luminous intensity of LEDs by optimizing their structures
Authors: Liu Zhaojin 
Published: April 2022

Abstract
The brightness enhancement of the light emitting diode (LED) can satisfy the increasing demands of illumination of human beings. However, the low-rate recombination of electron-hole pairs, isotropic nature of the spontaneous emission as well as the large refractive index of the materials used for LEDs usually limits the performance of the light output. Therefore, it is necessary to address these challenges, trying to enlarge the light output power with high optoelectronic efficiency. This review will analysis the factors that can influence the behaviour of the LEDs and the method to overcome these issues by optimizing the structures of epilayers and LED chips.
Research on in the interaction between laser and electron-positron plasma in cone target
Authors: shan Fei , Wang Pengpo , Zhang Pei , Shi Jiahao , Li Dapeng , Hang Xianfeng , Wang Yilei 
Published: April 2022

Abstract
Laser is used to accelerate the electron-positron plasma by ponderomotive force. Due to the electric field, electron and positron will have transverse diffusion in the acceleration. In this paper, a scheme is proposed to get high-energy particle beam by binding electron-positron plasma with hollow gold target. The transverse diffusion is restrained in the gold target. Particles can be continuously accelerated by ponderomotive force and the neutral particle beam is obtained in space. The tight focusing of laser makes the ponderomotive force stronger and stronger in the cone target. The energy gain obtained by the scheme is far beyond the limit of the ponderomotive force, which provides theoretical support for the practical application of electron-positron beam.
Vectorial wavefront holography based on a polarisation-insensitive hologram
Authors: Ren Haoran 
Published: April 2022

Abstract
Polarisation holography generally demands polarisation-sensitive holograms for reconstructing either polarisation-multiplexed holographic images or polarisation-sensitive image channels. To date, polarisation holography is underpinned by the Jones matrix method that uses birefringent holograms, including ultrathin metasurface holograms, limiting the polarisation control to orthogonal polarisation states. Here I introduce a novel concept of vectorial wavefront holography by exploiting the wavefront shaping of a structured vector beam. I will show that a phase hologram can be used to tailor the polarisation interference of a vector beam in momentum space, creating arbitrary polarisation states that include but not limited to the linear, circular, azimuthal, and radial polarisations. This opens an unprecedented opportunity for the multiplexing generation of arbitrary polarisation distributions in a holographic image. The demonstrated vectorial wavefront holography offers flexible polarisation control without using birefringent optical materials, which may find applications in polarisation imaging, holographic encryption, holographic data storage, multi-view displays, holographic Stokesmeter, and polarimetry.
Effect of regression and re-aging treatment on tensile yield strength anisotropy of 7050 aluminum alloy
Authors: Xie Linjun , Yuan Wuhua 
Published: April 2022

Abstract
In this study, the evolution rule of yeild strength and microstructure along the axial, hoop and radial directions of 7050 aluminum alloy ring forging during Regression and re-aging (RRA) heat treatment was studied by using the experimental technology of tensile property test and transmission electron microscope (TEM) and Electron backscatter diffraction (EBSD) observation. During the RRA process, the evolution rule of intragranular and intergranular precipitates along axial, hoop and radial directions of 7050 aluminum alloy ring forging was described by establishing a model. After the pre-aging stage, the yield strength of samples along the axial, hoop and radial directions of forgings shows obvious anisotropy, and the anisotropy decreases gradually after regression and re-aging treatment. The results show that the cause of the larger yield strength anisotropy is the inhomogeneous size and distribution of precipitates after the pre-aging stage; After the regression stage, the cause of the reduction of the yield strength anisotropy is due to the homogeneous distribution of intragranular precipitates; After re-aging treatment, the reasons of further reduction of the yield strength anisotropy are because of more homogeneous distribution of intragranular precipitates and the discontinuous of intergranular precipitates.
Understanding the dopability of p-type Mg2(Si,Sn) by relating hybrid-density functional calculation results to experimental data
Authors: Kamila Hasbuna , Ryu Byungki , Ayachi Sahar , Sankhla Aryan , Mueller Eckhard , de Boor Johannes 
Published: April 2022

AbstractIt is crucial to reach a sufficiently high carrier concentration in order to optimize the thermoelectric (TE) material in the development of Mg2X(X= Si, Ge, and Sn)-based TE generators. While n-type Mg2(Si,Sn) has excellent TE properties, p-type shows suboptimal TE performance because of insufficient carrier concentration, in particular for Mg2Si and Si-rich Mg2(Si,Sn). A systematic investigation of Li-doped Mg2Si1-xSnxhas been performed as Li, in contrast to other typical dopants, has a high solubility in the material system and has been shown to yield the highest reported carrier concentrations. We observe that the carrier concentration increases with Li content, but the dopant efficiency decreases. With respect to the Si:Sn ratio, we find a clear increase in maximum achievable carrier concentration and dopant efficiency with increasing Sn content. The trends can be understood by employing defect formation energies obtained within the hybrid-density functional theory (DFT) for the binaries. Further, we use a linear interpolation of the hybrid-DFT results from the binaries to the ternary Mg2(Si,Sn) compositions and a simple single parabolic band model to predict the maximal achievable carrier concentration for the solid solutions, providing a simple guideline for experimental work. Finally, we show that the approach is transferable to other material classes. This work highlights that, besides dopant solubility, the interplay between intrinsic and extrinsic defects determines the achievable carrier concentration.
Equivalent pin-forces or equivalent moments for the modelling of piezoelectric patches: a parametric study
Authors: Ajnada Taha , Corcolle Romain , Bernard Yves , Daniel Laurent 
Published: April 2022

Abstract
Many piezoelectric (PZ) actuation or sensing systems consist of PZ patches bonded on elastic beams or blades. In order to optimise the design of such systems, Finite Element Analysis (FEA) can be used. However, this option is relatively time consuming and not necessarily appropriate to the first steps of the design process. The replacement of FEA by simple analytical tools is desirable in the early design stages in order to explore the optimal configurations for the device (beam dimensions, patch position and properties). Two main modelling approaches can be found in the literature, based on the Solid Mechanics beam theory. The first approach consists in replacing the PZ patch by two opposite forces positioned at the surface of the beam, each at one extremity of the PZ patch. The second approach consists in replacing the PZ patch by two opposite moments positioned at the neutral axis of the beam, each at one extremity of the PZ patch. The object of this paper is to detail these options, and to evaluate their range of validity. For this purpose, a parametric study is conducted on a cantilever beam structure to compare the different approaches for standard dimensions and material properties. The results of corresponding FEA simulations are taken as reference. It is shown that the validity of analytical models is restricted to a narrow range of material properties and dimensions. This range is chosen when the error between the normalised displacements obtained analytically and those obtained by numerical calculation does not exceed 6%. Within this range, the two-moment model is revealed a more precise choice than two pin-forces. As a consequence, its validity range is larger compared to other analytical approaches. This is due to the introduction of the flexural stiffness of the PZ patch and of a realistic strain profile across the section of the structure. These results can be used to obtain analytical expressions of stress and strains in PZ actuation and sensing devices.
Polygamy: A Very Short Introduction
Authors: Pearsall Sarah M. S. 
Published: April 2022

Abstract
Polygamy: A Very Short Introduction offers a broad global and temporal history of polygamy and its importance in a range of settings. Polygamy, or plural marriage, has been an accepted form of union in the majority of human societies. People living on every continent have practiced this form of marriage; some still do. Plural marriages, like more recent same-sex marriages, offer intriguing access to the workings of the institution of marriage, as well as the controversies linking public and private, sex and politics, that have surrounded it. Confrontations over this type of marriage have also been historically important, especially in a range of colonial, imperial, and missionary encounters. Polygamy has come to symbolize a problematic, even “barbaric,” form of marriage. Yet, even amid Christians, it has had notable defenders, including a number of radical Protestants such as Martin Luther, John Milton, and, of course, Joseph Smith. This book illuminates the public importance of the intimate, considering issues of cultural contact and confrontation, the shape of empires, slavery and hierarchy, royal and aristocratic power, religion and conflict, war and expansion, race and nation.
Introduction
Authors: Pearsall Sarah M. S. 
Published: April 2022

Abstract
‘Introduction’ offers an introduction to the topic of polygamy by considering the usual stereotypes of polygamy, centering on the Church of Jesus Christ of Latter-day Saints (Mormons) and the harem of the Ottoman Turks, arguing that polygamy has a much richer and fuller history than these images suggest. Key terms such as polygamy, polygyny, polyandry, and marriage need a definition in order to fully appreciate this topic, as do key themes, including gender, the relations between women and men, and the relations between women and between men. Another theme is sex and reproduction. Labor and slavery, especially the role of women in domestic work, as well as rank and status, are also themes that inform this topic. Finally, an important element to consider is the clash of religion and culture and a consideration of race and ideas of progress.
Origins and overview
Authors: Pearsall Sarah M. S. 
Published: April 2022

Abstract
‘Origins and overthrows’ considers the origins of polygamy and its representation in the book of Genesis in the Hebrew Bible, telling the story of Abraham, Sarah, and Hagar, who were involved in a plural union. The issues of fruitfulness and population growth have animated many practices of polygamy. It is worth considering a range of geographical settings and the ubiquity of polygamy around the world. Polygamy was a vital political aspect of the Incan Empire in what is now Peru, as well as the Siamese kingdom in what is now Thailand and the kingdom of Buganda in eastern Africa. Concubinage systems in places such as China also receive attention, as does the practice of polygamy among indigenous Americans, Māori, and Aboriginal people as well as medieval Europeans, including the Irish.