bluuebunny/crossref_metadata_2025 huggingface dataset:
Landslide susceptibility prediction using C5.0 decision tree model
Authors: Shua Qiangqiang , Chen Xiaogang , Lian Zhipeng , Liu Gengzhe , Tao Siyu
Published: October 2022

Regional landslide susceptibility prediction (LSP) research is of great significance to the prevention and control of landslides. This study focuses on the LSP modelling based on the decision tree model. Taking the northern part of An’yuan County of Jiangxi Province as an example, 14 environmental factors including elevation, gully density and lithology are obtained based on geographical information system (GIS) and remote sensing satellite. Frequency Ratio method and C5.0 decision tree (DT) model are coupled to build DT model for LSP modelling. Then the predicted results are graded into five attribute intervals. Finally, LSP performance of DT model is evaluated by comparing the area value under the receiver operating characteristic curve (ROC) and classification of landslide susceptibility. The results show that the AUC accuracy of the C5.0 DT model is 0.805, and the LSP results of the C5.0 DT model are consistent with the actual distribution pattern of landslides in this County.
Research progress of waste retaining dam expansion project technology for large domestic waste landfills
Authors: Song Shuxiang , Zheng Chao , Huang Qiufeng
Published: October 2022

In view of the problem of insufficient storage capacity of the original landfill site, it is a very economical and effective way to use the horizontal, longitudinal and composite extension of garbage dam with geotextile reinforced earth dam. In this paper, the types of garbage dam, dam extension technology, dam reinforcement method and stability of garbage dam are introduced and discusses the types and advantages and disadvantages of dam retaining, the construction technology of dam retaining, the stability analysis and influencing factors of garbage dam retaining and the safety monitoring of dam body.
Research on Comprehensive Evaluation Method of Competitiveness of Energy-saving Low-carbon Value-added Service
Authors: Yan Qibo , Sheng Meiqi , Zhao Ailin , Zhang Kailin , Zhang Xiaochun
Published: October 2022

Traditional electricity sales services present a development trend of diversification and integration, and will gradually evolve into comprehensive energy services in the future. Energy-saving, low-carbon value-added services are an important part of it, which is important for grid companies to cultivate core competitiveness in the electricity sales market. effect. In this regard, this article conducts a comprehensive evaluation of the competitiveness of energy-saving low-carbon value-added services based on the perspective of power grid companies. First, this article constructs an energy-saving low-carbon value-added service competitiveness evaluation system from the aspects of energy-saving, intelligent, personalized, and comprehensive levels; secondly, constructs a comprehensive evaluation model for the competitiveness of energy-saving and low-carbon value-added services, using AHP weighting method Empower the supervisor, and then conduct a comprehensive evaluation based on the fuzzy comprehensive evaluation; finally, select the Y city power company to conduct an empirical analysis of the comprehensive evaluation model, and provide a favorable reference for other companies to carry out energy-saving low-carbon value-added services in the future.
Application of a new method of reservoir interface prediction in geological steering of horizontal Wells
Authors: Liu Chenpu
Published: October 2022

New method in this paper, we study the reservoir interface prediction in the application of horizontal well geological guidance function, the article in the process of study, theoretical analysis of the horizontal well geosteering and reservoir prediction interface, new methods and combining the theory and practice, studies the reservoir prediction interface new method in the application of horizontal well geosteering.
Study on the ambulatory monitoring and optimization measures of the Gas wells in block A
Authors: Yan Shujuan
Published: October 2022

The analysis of the Gas well is the core work and accompanying with the whole process of gas field development. The dynamic monitoring technology of gas well is an effective way to provide theoretical basis for dynamic analysis. Now there are 3 normal production gas Wells in the production test area of block A. In the process of production, pressure recovery, hydrostatic pressure and corrosion monitoring were carried out for the changes of production, pressure, fluid physical properties and underground surface engineering.We know the fluid accumulation, the corrosion of the downhole string, the reservoir characteristics, the reservoir physical parameters by these monitoring activities. So we guide the reasonable production of gas Wells timely and effectively, in order to better provide a basis for gas well production management and scientific decisionmaking. We should carry out rectification and strengthen management to problematic gas Wells and loopholes in dynamic monitoring, and provide better assurance for the development of gas fields.
Study on the Stratigraphic Framework and Main Control Factors of Hydrocarbon Formation in Thin Reservoirs of Carboniferous Clastic Rocks in Tahe Oilfield
Authors: Deng Feng , Sun Li , He Youjuan , Hou Huaxing , Yang Zhi
Published: October 2022

The Carboniferous Karashayi Formation in Tahe Oilfield is one of the most promising formations in the field of clastic rocks in Tahe Oilfield, which is rich in hydrocarbon resources, but the stratigraphic framework is unclear, which restricts the exploration of hydrocarbon formation. The stratigraphic features and seismic section analysis of the area combined with oil and gas distribution are used to analyze the stratigraphic framework and reservoir control factors of the Karashayi Formation. The results show that the lower part of the Carboniferous sedimentary strata is overburdened and the top part is denuded. The Karashayi Formation can be divided into four tertiary sequences and seven system domains. The oil and gas reservoirs are mainly developed near the interface of the sequences. Good transport conditions and stratigraphic unconformity cusp blocking can also make the marine intrusion system domain a favorable location for oil and gas accumulation. The Carboniferous Karashayi Formation is located on a convex overburden background and is a composite reservoir controlled by a stratigraphic unconformity and stratigraphic sharp extinction, which is influenced by tectonics, fractures, and lithology.
Microbial degradation for the remediation of soils contaminated by crude oil in Peru: A systematic review of the literature
Authors: Jimenez Favio , Maldonado Ronny
Published: October 2022

In this research, a systematic literature review is carried out whose objective is to identify, compare and analyze the main fundamentals to be considered in order to face the problematic of remediation of soils contaminated by crude oil in order to establish and achieve a high efficiency of this. This work was elaborated through a comprehensive analysis of the various suitable scientific articles that provide a more comprehensive basis in relation to what is discussed in this research, taking as a basis the results that were optimal in the remediation of soils in terms of their various experiments made that were successful in the realization. Therefore, finally, it is obtained that the various technologies used for the remediation of the contaminated soil should not be treated only at the laboratory level but also at the field level due to the fact that there is a great gap in the treatment of the soil due to the conditions and variables that change significantly, thus reducing their remedial application in contaminated soil, presenting a minimal environmental impact and high investment costs in large-scale projects.
Research of a modified nano-depressure and augmented injection agent
Authors: Pan Qianhong , Shen Yanhong , Liu Xiuhua , Zhao Kun , Du Jialu , Li Yali
Published: October 2022

In this paper, the research and application of nanomaterials in oilfield chemical engineering was briefly described with emphasis on the nano-silica in enhanced oil recovery, depressure and augmented injection. A study on the modification of nano-silica was carried out indoors, and a modified nano-depressure and augmented injection agent was prepared by using a coupling agent for surface grafting modification, followed by introducing functional monomers for in-situ modification. The effects of silica dosage, coupling agent dosage, dispersant and regulator ratio, and modification time on the modified product were investigated. It was analyzed by infrared spectroscopy, thermogravimetric analysis, nanoparticle size analyzer, transmission electron microscope, atomic force microscope, etc. A series of experiments were conducted to evaluate the temperature and salt resistance, wettability, as well as depressure and augmented injection performance of the modified products.
Development and Application of Educational Mini CNC Milling Machines
Authors: Zhou Xin’an , Pan Junbing
Published: October 2022

Industrial CNC milling machine is huge in volume, complex in structure, poor in system openness and expensive in price, which increases the cost of training relevant professional and technical personnel in enterprises and schools, and restricts the further development of CNC milling machine. In order to solve this problem, based on the existing domestic CNC milling machine and previous research results, this paper designs a teaching type micro CNC milling machine with high integration, low cost, convenient handling, simple structure and high flexibility, and carries out processing experiments on the micro CNC milling machine. The experimental results show that when the spindle speed is 5000 r/min, the feed rate is 2000 mm/min and the engraving cutter is 1 mm, the machining error of the teaching type micro CNC milling machine is 0.1 ~ 0.2 mm, can well reflect the shape of the object to be processed, can meet the students' understanding and learning of CNC machine tools, and meet the needs of carving enthusiasts, in order to make contributions to the further development of CNC milling machines in China.
Hyperspectral characteristics of altered rock and soil features and compositional correlation analysis
Authors: Liu Zhiming , Liu Xiangcui , Zhang Tong
Published: October 2022

Hyperspectral characteristics of ground features are the basic data of modern remote sensing. In this paper, reflectance spectrum detection was carried out on the altered rock and soil features from mountainous environment. The analysis between reflectance spectrum and its related compositions was studied on the rock and soil samples collected. The typical hyperspectral characteristics and their influencing factors of the altered rock and soil features were proposed. The relevant conclusions could provide spectral information reference for remote sensing analysis of altered rock and soil features and environmental evaluation of the northern mountainous environment in China.
Water pollution assessment and health risk analysis of Puzhehei Lake
Authors: Wang Ziyuan , Liu Xingyue , Zhou Songlin , Li Wei
Published: October 2022

Puzhehei Lake is located in Wenshan Prefecture, Yunnan Province. Water pollution assessment is of great significance for the pollution control of the lake and the sustainable development of the basin. This study evaluates the water pollution and eutrophication status of three sampling points (upstream, middle and downstream) of Puzhehei Lake based on single factor evaluation method, comprehensive pollution index method and improved comprehensive pollution index method based on entropy weight method, and analyzes the water health risk. The results show that the water quality of the three sampling points is sub-class V using the single factor evaluation method. The water quality evaluation result based on the traditional comprehensive pollution index method shows that the water quality of the three sampling points belongs to heavy pollution. By contrast, the improved comprehensive pollution index method based on entropy weight method shows that the water quality of Leshui Cave belongs to class V, while the water quality of Puzhehei Village and Karst Wetland Park belongs to class V. According to the comprehensive evaluation method, the water quality of the three sampling points before and after correction is ranked from good to bad as follows: Leshui Cave, Karst Wetland Park and Puzhehei Village. The water bodies of Leshui Cave and Puzhehei Village are moderately nutritious, and the water bodies of Karst Wetland Park are oligotrophic. The chemical carcinogens health risk in water at the three sampling points exceeded the standard seriously, and the risk ranking was as follows: Karst Wetland Park > Leshui Cave > Puzhehei Village, in which Cr exceeded the standard seriously. The non carcinogenic health risk are low, and the risk ranking is Puzhehei Village > Leshui Cave > Karst Wetland Park. In the future water quality control, we should focus on the strict control of TN and TP in rivers entering the lake.
Study on Numerical Simulation of Fire Flooding Reservoir
Authors: Peng Zhencheng , Li Mingzhong , Liu Chenwei , Meng Fanyu , Zhang Shun
Published: October 2022

Fire flooding, also known as in-situ combustion technology, is a mining technology that can greatly improve the recovery of heavy oil reservoir. The composition of the output of the fire flooding oil well is very different from that of other heavy oil thermal recovery wells, and shows regular changes with different stages of fire flooding. These changes have a great impact on the efficient lifting of the fire flooding oil well. Numerical simulation can be used to simulate the combustion process of fire flooding and the heat and mass transfer process in the reservoir, so as to simulate the changes of the components of the output with different stages of fire flooding, and provide guidance for the design of fire flooding lifting. The results show that it is feasible to use reservoir numerical simulation software to simulate the production performance and the change of production composition of in-situ combustion oil wells.
Field test practice and understanding of effective utilization technology for dense and refractory reservoir in block A
Authors: Xiu Zengpeng , Qi Linhai , Liu Li
Published: October 2022

In view of the ultra-low permeability reservoirs in Block A of Hailar Oilfield, it is difficult to establish an effective driving system between oil and water wells due to the influence of many oil-bearing strata, poor reservoir physical properties and large vertical span of oil layers. With the deepening of development, it is more difficult to use reservoirs. In order to realize the effective utilization of low permeability reservoirs in Beier Oilfield, the successful experiences of tight oil and Hailar large-scale fracturing in peripheral oilfields are summarized, and the effective utilization technology of large-scale fracturing supplementary energy development is explored. The large-scale fracturing evaluation of ultra-low permeability reservoirs and the optimization of potential well areas are carried out, so as to fully tap the
CO2 Emission Accounting Model in Nonferrous Mining Industry
Authors: Ju Liping , Zhu Yibin
Published: October 2022

The policy of carbon peak in 2030 address the question of how to account CO2 emissions of Nonferrous Mining. The aim of this study is to establish CO2 emissions accounting model, focused on usual activities, e.g. fuel combustion emission, process emission, emission from purchased and exported electricity and heat. And also to discuss explosive and urea emission sources to identify the significant process that contribute the most to climate change. Moreover, the accounting model is chosen to evaluate emissions of one mine in china, and explosive explosion and urea use of CO2 emissions accounting for 4.61% and 3.97%, respectively.
Research and application of the method based on the displacement gradient method to implement the fragmented breakpoint at the end of the fault
Authors: Zhang Jinyu
Published: October 2022

The limitation of seismic resolution makes the interpretation of fault end locations based on seismic data unclear, and often can only be predicted qualitatively by human, which makes the combination relationship of breakpoints near or below seismic resolution unclear. The breakpoint combination rate is generally low, which affects the development injection and recovery relationship and remaining oil distribution.
Practice and cognition of effective water-flooding development mode in Gaotaizi block of ultra-low permeability reservoir
Authors: Cui Ping
Published: October 2022

During nearly 25 years of water injection development in Gaotaizi reservoir of LHP oilfield, due to poor reservoir physical properties, poor adaptability of well pattern and difficulty in establishing effective displacement between oil and water Wells, linear water injection, infill adjustment and refracturing tests have been carried out successively. Although certain effects have been seen, the effects are short and unsatisfactory. In this paper, the microscopic pore structure, sensitivity and seepage characteristics of ultra-low permeability high platform reservoir are studied through core laboratory experiments. New technology of nonlinear test and low permeable physical simulation experiment, the research on the rules of the nonlinear characteristics of the reservoir fluid and the characteristics of movable oil through research has been clear about the dragon bubble oilfield high effective displacement distance platform layer, and the new fracturing technology and the development of the technology to adjust the organic combination, the displacement between well and well past into displacement between Wells and joint network, explore the ultra-low permeability reservoir to improve the single well production, new ways to improve the development effect, with the types of low permeability oilfield development effectively.
Influence of abnormal water injection well on qualified rate and treatment countermeasures
Authors: Zhang Jianyu
Published: October 2022

More heterogeneous oil reservoir in the process of waterflooding oil field, reasonable water injection is to improve the recovery efficiency, an important means to slow down the natural decline, strengthen the daily management of injection Wells, according to the influencing factors of injection Wells anomalies corresponding measures, improve the water time, improve the qualified rate of water injection, truly underground “good enough water and injection water” goal, It is the most economical and effective way to improve oil recovery.
Research and application of water flooding injection and production technology after polymer flooding
Authors: Sun Qingfeng
Published: October 2022

For reservoir water flooding after polymer flooding injection points existing in the mining process of high temperature resistant performance is poor and multistage unlock difficulty, examination, and the sealing problems such as in-depth study and analysis, innovation to a new set of return to spit points injection points production technology, to produce more suitable sealing high voltage can be found on a variety of well conditions return to spit points a column technology, is helpful for better improvement points injection tube service life, At the same time, it can effectively solve the problem of clogging downhole concentric test and adjustment unit. Oilfield exploration into the follow-up after water flooding stage, the well will show the water fast, fast production decline, the characteristics of a return so often need to take back to spit on mining technology, but the technology has high pressure resistance and multistage unlock difficulty problem, makes the life of the mining process is shorter, so according to the technical problems existing in the in-depth study and analysis, The effective outcome measures are put forward to provide necessary technical support for reservoir benefit after polymer flooding.
Design of core thermocouple adaptive plug-and-pull device
Authors: Zhou Jianhua , Guo Yongqiang , Tian Guangzheng , Ji Songdi , Zhang Jifu
Published: October 2022

In the process of change and maintenance material of nuclear power plants, due to the uncontrollable driving force of the existing core thermocouple insertion and removal tools, it is easy to cause the thermocouple to be installed in place, the thermocouple to be easily damaged, or even to have poor sealing, and the pressure boundary of the primary circuit is incomplete and other issues. Aiming at the above problems, this paper takes FPGA as the core controller, and adopts a closed-loop control method with multiple modes of force, speed and displacement, and develops a set of automatic insertion and removal device for nuclear power plant core thermocouple. The device has the advantages of safety and reliability, high control precision, and online observation of multiple parameters.
Determination of reasonable test time of periodic injection well in Punan Oilfield
Authors: Gu Wanxing
Published: October 2022

There were 232 stratified injection Wells in Bunan Oilfield in 2020, including 69 year-round injection Wells and 163 periodic injection Wells. There are many periodic injection Wells and the pressure recovery is slow after injection. After the test, the pressure fluctuates greatly, and the data cannot be reported outside in time, which affects the water distribution. In 2020, according to our actual statistics, the water injection pressure of 38 Wells had a difference of more than 2MPa from the qualified pressure point of the test data before the test of stratified injection well. The reason of pressure discrepancy is mainly related to periodic water injection. In view of this situation, we conducted an investigation on the cycle injection Wells of the whole mine in 2020. The pressure recovery curve was plotted according to the daily injection volume and the length of periodic injection stop time. At the same time, the method of determining the reasonable testing time of periodic injection well is put forward, which provides scientific basis for determining the testing time of periodic injection well.
Mix-ratio optimization for air-tight tunnel concrete
Authors: Huang Xiaoliang , Zhang Yong , Hou Dingge , Xue Cheng , Li Guang , Li Bo , Wang Zhendi , Li Bin
Published: October 2022

In this paper, we studied the effect of fly ash and mix ratio on the compressive strength of air-tight concrete, the introduced fly ash would decrease the early compressive strength of concrete. With curing age increasing, the gape in the compressive strength between concrete without fly ash and concrete containing fly ash is decreasing. Moreover, concrete containing fly ash showed smaller air permeability, the introduced fly ash improved the airtightness of concrete.
Research on the technology of increasing the output of thermal power units in Shandong Province under the demand of ensuring supply
Authors: Zhong Ziwei , Zhu Lingkai , Zheng Wei , Gong Zhiqiang , Shang Panfeng , Guo Junshan , Liu Jun , Zhang Yanpeng
Published: October 2022

Under the background of “carbon peaking and carbon neutralization”, China proposes a new power system based on new energy. Due to the strong randomness, volatility and anti peak regulation characteristics of renewable energy, in order to promote the consumption of new energy and ensure the power supply, coal-fired power generation units will undertake the dual tasks of deep peak regulation and power supply guarantee in the future, and gradually transform from electricity type power supply to regulation type power supply.
A Comparative Study of AutoML Approaches for Short-Term Electric Load Forecasting
Authors: Meng Zhaorui , Xie Xiaozhu , Xie Yanqi , Sun Jinhua
Published: October 2022

Deep learning is increasingly used in short-term load forecasting. However, deep learning models are difficult to train, and adjusting training hyper-parameters takes time and effort. Automated machine learning (AutoML) can reduce human participation in machine learning process and improve the efficiency of modelling while ensuring the accuracy of prediction. In this paper, we compare the usage of three AutoML approaches in short-term load forecasting. The experiments on a real-world dataset show that the predictive performance of AutoGluon outperforms that of AutoPytorch and Auto-Keras, according to three performance metrics: MAE, RMSE and MAPE. AutoPytorch and Auto-Keras have similar performance and are not easy to compare.
Study on current characteristic detection method of hydraulic solenoid valve in nuclear power plant
Authors: Wang Haibao , Tan Xudong , Xiao Qunxiong , Chang Xincai
Published: October 2022

In this paper, a set of electromagnetic valve current characteristic test system is designed to improve the reliability of the trip solenoid valve in the field steam turbine system of nuclear power plant. The test system starts from the field requirements, working principle of solenoid valve, software control and other aspects to complete the pressure suppression function of the hydraulic test system and the functions of data acquisition, storage, display, playback and so on. The test system is composed of a hydraulic system and an electrical control system. The system verifies the reliability of the tested object by detecting the important parameters of the solenoid valve, calibrating the current characteristic points, calculating the characteristic parameters, and judging whether the test is qualified. The test results show that the system has been successfully applied in nuclear power field, meets the needs of the site, and works well.
Research on security protection strategy of flexible interactive platform between captive power plant and power grid
Authors: Zhu Lingkai , Liu Jiyan , Wang Weishuai , Zhong Ziwei , Zheng Wei , Han Yue , Gong Zhiqiang , Guo Junshan , Shang Panfeng
Published: October 2022

In order to strengthen the security protection of the flexible interactive platform between the self owned power plant and the power grid, ensure the security of business data, resist the malicious attacks of hackers, improve the robustness of the platform operation, and ensure the safety and reliability of users' power consumption, it is necessary to take a number of security protection technical means to build a comprehensive security defense system of the power grid platform.
Application of inorganic chemicals in industrial wastewater treatment
Authors: Zhang Zhien
Published: October 2022

With the development of social economy, environmental protection projects have attracted wide attention from all walks of life, especially in industrial development, which can pay attention to environmental problems. Inorganic chemicals have important value in industry and can be well used for scientific treatment of industrial wastewater. It mainly includes the specific application of inorganic chemicals in industrial treatment of printing and dyeing wastewater, heavy metal wastewater, papermaking wastewater, fur, slaughter and other organic wastewater, and electroplating wastewater.Understand the contents of chemical agents themselves, discuss the specific classification of chemical agents, and think about the specific application ways and directions of inorganic chemical agents in the process of industrial wastewater treatment, hoping to have a deeper understanding of inorganic chemical agents, provide a good foundation for the smooth and stable development of industrial wastewater treatment, and show the corresponding technologies to improve the future industrial level.
Measuring competition between the great powers across Africa and Asia using a measure of relative dispersion in media coverage bias
Authors: Gooch Elizabeth , Goethe Stone , Sobrepena Nicholas , Eckstrand Eric
Published: October 2022

Senior leaders in the US Department of Defense, as well as global affairs strategists and academics, have argued that China’s economic growth is associated with a dramatic increase in competition for resources and Chinese influence abroad. We aim to ascertain whether and where competition between great powers exists and to characterize China’s growing influence. Our main contribution is that we create a measure of competition among the United States, China, Russia, India, and France within African and Asian countries. We draw our data from a large media database that records news articles published since March 2015. We sum the quantity of articles published by local press agencies that discuss an international or regional powers’ engagement in an event located within the Asian or African countries’ borders, and we construct a measure of country-level competition among powers. To validate our country-level competition measure, we synthesize qualitative information from current government, think tanks, and academic documents on the presence and interests of foreign powers across subregions in Asia and Africa. From those narratives, we construct an additional subregional measure of competition. We compare our statistical country-level measure of competition to this narrative-based subregional measure of competition and find that they are correlated.
Large area multi-filamentary plasma source for large volume plasma device–upgrade
Authors: Sanyasi A. K. , Srivastava P. K. , Adhikari Ayan , Awasthi L. M. , Leuva P. , Santra P. , Doshi B. , Gupta M. K. , Sugandhi R.
Published: October 2022

This paper discusses the salient features and plasma performance of the newly installed Large Area Multi-Filamentary Plasma Source (LAMPS) in large volume plasma device–upgrade. The plasma source is designed to exhibit a plasma electron density of ∼1018 m−3, low electron temperature (∼eV), and a uniform plasma cross section of 2.54 m2. The directly heated LAMPS emits accelerated primary energetic electrons when it is biased with a negative discharge voltage with respect to the anode. The hairpin shaped tungsten (W) filaments, each of diameter 0.5 mm and length 180 mm, are heated to a temperature of 2700 K by feeding ∼19.5A to each filament. The LAMPS consists of 162 numbers of filaments, and it has been successfully operated with a total investment of 50 kW of electrical power. The LAMPS as a laboratory plasma source is characterized by large operational life, ease of handling, better compatibility to high pressure conditions, and advantages over other contemporary plasma sources, viz., oxide coated cathodes, RF based sources, and helicon sources, when producing plasma over large cross sections and fill volumes. Pulsed argon plasma is produced with quiescence (δnene≪1%) using LAMPS for the duration of 50 ms and a reasonably good radial uniformity (Ln = 210 cm) is achieved. Good axial uniformity is also observed over the entire length of the device. Initial measurements on plasma parameters have yielded plasma density of ∼2×1017m−3 with existing set of filaments. A plasma density of ∼1018 m−3 is envisaged for larger thickness of filaments, such as 0.75 and 1.0 mm, with the existing plasma source assembly setup.
Nested formation mechanisms of Fano line shape in far-field response of coupled waveguide multilayer structure revealed by analyses of local electric fields
Authors: Hayashi Shinji , Motokura Kengo , Fujii Minoru , Nesterenko Dmitry V. , Sekkat Zouheir
Published: October 2022

Based on electromagnetic calculations, the formation mechanism of the Fano line shape in the attenuated total reflection (far-field) spectrum of a coupled waveguide multilayer structure is studied in detail by tracing back to the behaviors of local electric fields. The Fano line shape of absorptance A directly related to the reflectance by R=1−A is shown to be generated by a superposition of a Fano line shape exhibited by local absorption in one of the waveguide layers and a Lorentzian line shape exhibited by local absorption in another waveguide layer. It is also shown that the Fano line shape of the first waveguide layer is generated by a superposition of different Fano line shapes exhibited by local electric fields at different positions inside the waveguide layer. These results unveil the nested mechanisms of the Fano line shape formation hidden in the behaviors of local electric fields. The Fano resonance inside the first waveguide layer is thought to be an example of the multiple Fano resonance arising from the interaction between multiple continua with a discrete state.
Biphasic flow dynamics and polarized mass transportation in branched hepatic sinusoids
Authors: Hao Yinjing , Lü Shouqin , Li Wang , Long Mian , Cui Yuhong
Published: October 2022

In fatty liver diseases, such as liver fibrosis and liver cirrhosis, blood flow in hepatic sinusoids, an elementary building block of the liver lobule, tends to bypass through collateral vessels inside sinusoids and presents distinct sinusoidal flows compared to normal physiological flows. It remains unclear in those flow characteristics in branched sinusoids and the correlation of pathological flows with liver lesions, mainly due to the difficulty of direct hemodynamics measurements in the sinusoids. Here, we developed a dual-branched theoretical model of hepatic sinusoidal flow to elucidate the relevant flow dynamics and mass transport. Numerical simulations, based on the lattice Boltzmann method, indicated that the flow velocity distribution in hepatic sinusoids is mainly dominated by endothelium permeability and presents a non-monotonic variation with the permeability at the fusion segment of these branched sinusoids. Flow-induced shear stress on the endothelium at the side of the Disse space exhibited a biphasic pattern, yielding a low shear stress region at the junctional site. Meanwhile, a highly polarized distribution of lipoproteins concentration was also presented at the low shear stress region, indicating a localized accumulation of typical hepatic serum proteins. Thus, this work provides the basic understanding of blood flow features and mass transport regulations in branched hepatic sinusoids.
Qualitative changes in bifurcation structure for soft vs hard impact models of a vibro-impact energy harvester
Authors: Costa Dimitri , Kuske Rachel , Yurchenko Daniil
Published: October 2022

Vibro-impact phenomena in engineering systems, considered an adverse effect in some settings, are an intrinsic part of the mechanism in others. In energy harvesting, a vibro-impact component is often intentionally introduced to increase the power output or the system’s bandwidth. The impacts can be treated as “hard” for instantaneous impacts or “soft” for compliant materials. Since both types of models exhibit complex dynamics, a comparison is non-trivial. We develop a soft impact model for a vibro-impact energy harvester, calibrating it with the relevant hard impact model for large stiffness, and systematically compare the different phenomena and dynamics in various compliant regimes. Numerical results are used in two different parametric analyses, considering the bifurcation diagrams in terms of device size and external forcing parameters. Varying the natural frequency of the membranes that form the impact boundaries, we observe shifts in the bifurcation structure that promote period-1 orbits for increased softness parameters, often generating higher power output, but also introducing parameter sensitivities for increased softness. Complementary analytical results reveal unstable periodic orbits and co-existing behaviors, potentially missed by computational methods, that can influence the bifurcation structure and in turn the energy output. A non-dimensional formulation highlights the significance of ratios of external and natural frequencies in delineating soft and hard impact scenarios parametrically. The soft impact model exhibits new symmetry breaking bifurcations related to key quantities that characterize the soft impact dynamics, such as the effective restitution coefficients, the impact phase, and the contact time interval, not captured by hard impact models.
Plasma electron contribution to beam emittance growth from Coulomb collisions in plasma-based accelerators
Authors: Zhao Y. , Lehe R. , Myers A. , Thévenet M. , Huebl A. , Schroeder C. B. , Vay J.-L.
Published: October 2022

Coulomb collisions with background plasma can cause emittance growth in plasma accelerators. This paper extends the theory to consider collisions with not only motionless plasma ions but also plasma electrons with relativistic motion, based on the Frankel cross section. The theory is verified by particle-in-cell simulations with a Monte Carlo collision module. It is shown that the electron contribution has the same amount as that of ions in linear acceleration regime and may not be negligible in nonlinear regime depending on the plasma electron density and its relativistic bulk velocity.
Optimizing the energy product of exchange-coupled soft/hard Zn0.2Fe2.8O4/SrFe12O19 magnets
Authors: Traistaru O. T. L. , Shyam P. , Christensen M. , Madsen S. P.
Published: October 2022

Permanent magnets based on ferrites are currently studied as possible alternatives, in several application areas, to rare-earth-based magnets to overcome the barriers of high costs, unavailability, and environmental impact. Their attractiveness lies in the large crystalline anisotropy, ensuring resistance to demagnetization, and the possibility of having their modest saturation magnetization enhanced through exchange-coupling with a compatible soft magnetic material of higher saturation magnetization. Using analytical calculations, a micromagnetic finite element model, and comparison with measurements on a produced sample, the conditions that give the highest possible maximum energy product are determined for ferrite-based exchange-coupled Zn0.2Fe2.8O4/SrFe12O19 soft/hard nanocomposite magnets. Two geometries are considered: a spherical core–shell geometry and a composite granular microstructure. Two sets of material parameters are considered for the granular structure, one from the literature and one obtained by fitting to the measured magnetization data. The results show that it is important to have a well-aligned easy axis of hard grains and that the optimal amount of the soft material depends on the alignment of the hard grains as well as their size, with smaller grains yielding larger (BH)max values. The core–shell model shows that the maximum (BH)max can be strongly enhanced, from ∼40 to ∼60 kJ/m3, by using a hard core diameter of <30 nm and a soft shell thickness of <7 nm. The composite granular structure yields a maximum (BH)max of ∼50 kJ/m3 for a soft volume fraction of 43%.
Scale-free avalanche dynamics possibly generated by randomly jumping among many stable states
Authors: Yu Chaojun , Zhai Jian
Published: October 2022

A large amount of research has used the scale-free statistics of neuronal avalanches as a signature of the criticality of neural systems, which bears criticisms. For instance, the work of Touboul and Destexhe demonstrated that non-critical systems could also display such scale-free dynamics, which passed their rigorous statistical analyses. In this paper, we show that a fully connected stochastic neural network may also generate scale-free dynamics simply by jumping among many stable states.
Investigation of contact mechanism and gate electrostatic control in multi-channel AlGaN/GaN high electron mobility transistors with deep recessed ohmic contact
Authors: Yang Ling , Lu Hao , Niu Xuerui , Zhang Meng , Shi Chunzhou , Deng Longge , Hou Bin , Mi Minhan , Wu Mei , Cheng Kai , Zhu Qing , Lu Yang , Lv Ling , Ma Xiaohua , Hao Yue
Published: October 2022

In this paper, the ohmic contact mechanism and gate electrostatic control of a deep-recessed ohmic contact structure for multi-channel Al0.3Ga0.7N/GaN high electron mobility transistors (HEMTs) is investigated. A transmission electron microscope and an energy dispersive spectrum are utilized to investigate the ohmic contact interface mechanism. Due to a reduction of source/drain parasitic resistances and simultaneous connection of five channels by using deep-recessed ohmic contact, a large maximum drain current density and a distinct five hump feature of ultra-wider trans-conductance are achieved. More importantly, it is revealed that the downward expansion of the gate potential for the deep-recessed ohmic contact structure is much deeper than that for conventional devices. This characteristic leads to a remarkable reduction in subthreshold swing (SS) and off-state leakage, indicating an ultra-wide and high trans-conductance profile. The fabricated devices show a lower off-state drain leakage, a lower SS, and a wider gate voltage swing (40 V). Due to an enhancement of gate electrostatic control, the current collapse and electrical reliability characteristics of multi-channel Al0.3Ga0.7N/GaN HEMTs with deep-recessed ohmic contact also improve. The results presented here indicate that the multi-channel device has great potential for high current and wide bandwidth applications.
A novel hyperchaotic system with fast and slow attractors
Authors: Wang Shaofu
Published: October 2022

A novel hyperchaotic system with only one equilibrium point is proposed by introducing an additional state feedback. The dynamic behaviors of this system are investigated by means of the Lyapunov exponent, Poincaré map, and bifurcation diagrams, i.e., this new hyperchaotic system possesses two positive Lyapunov exponents within a large range. Interestingly, the chaotic attractor of the system is special with two slow and fast attractors, that is, the system is a combination of slow and fast parts. The bound estimation of this system is also investigated. In addition, the image cryptology method is performed. In the image encryption part, an algorithm is suggested to provide confusion and diffusion operations on the image. The results show that, by employing the hyperchaotic system, the original image information can be completely hidden after being encrypted and can be decrypted efficiently.
Interventions designed to improve uptake of allopurinol for gout treatment in Aotearoa New Zealand: a scoping review
Authors: Ofanoa Samuela , Ofanoa Malakai , Tu’akoi Siobhan , Lutui Hinamaha , Heather Maryann , Jansen Rawiri McKree , Dalbeth Nicola , Grey Corina , Goodyear-Smith Felicity
Published: October 2022

Introduction Gout in Aotearoa New Zealand (NZ) remains an equity issue. The prevalence in Pacific and Māori people is one of the highest internationally. Although Pacific and Māori experience earlier onset and higher burden of gout, which can severely impact their quality of life, their management of it is often sub-optimal. Aim To conduct a scoping review of the NZ literature for interventions to improve the uptake/management of allopurinol for gout and their evaluation. Methods Databases Medline, Scopus, Embase, and CINAHL Plus and the grey literature were searched systematically to identify all NZ intervention studies aiming to improve allopurinol uptake for gout treatment. Interventions included: if they were delivered in NZ, aimed to improve allopurinol uptake, and were provided in English. A narrative approach was used to extract and synthesise data. Results Eighteen peer-reviewed and grey literature publications met the search criteria. Interventions clustered into three domains: multifaceted or multi-practitioner; gout app; and online booklets or fact sheets. Serum urate levels improved in multi-faceted or multi-practitioner interventions only, whereas the gout app only improved patients’ awareness and understanding of gout and medications. Online fact sheets and booklets need more active utilisation from health professionals to improve gout health literacy. Discussion Most gout interventions in NZ use multifaceted or multi-practitioner approaches. Although most interventions successfully controlled serum urate levels and improved equitable access for gout patients to urate-lowering therapy, these interventions did not sustain retention, completion, and engagement for certain population groups, particularly Pacific and Māori, who experience a higher burden of gout.
Dissociable rhythmic mechanisms enhance memory for conscious and nonconscious perceptual contents
Authors: Cheng Phillip (Xin) , Grover Shrey , Wen Wen , Sankaranarayanan Shruthi , Davies Sierra , Fragetta Justine , Soto David , Reinhart Robert M. G.
Published: October 2022

Understanding the neural mechanisms of conscious and unconscious experience is a major goal of fundamental and translational neuroscience. Here, we target the early visual cortex with a protocol of noninvasive, high-resolution alternating current stimulation while participants performed a delayed target–probe discrimination task and reveal dissociable mechanisms of mnemonic processing for conscious and unconscious perceptual contents. Entraining β-rhythms in bilateral visual areas preferentially enhanced short-term memory for seen information, whereas α-entrainment in the same region preferentially enhanced short-term memory for unseen information. The short-term memory improvements were frequency-specific and long-lasting. The results add a mechanistic foundation to existing theories of consciousness, call for revisions to these theories, and contribute to the development of nonpharmacological therapeutics for improving visual cortical processing.
La posición de clíticos argumentales con complejos verbales en un corpus oral
Authors: Manjón-Cabeza Cruz Antonio
Published: October 2022

Abstracta

En español los clíticos pronominales muestran la posibilidad de variación cuando acompañan a un complejo verbal, ya que pueden ir antepuestos o pospuestos. Esta posibilidad ha sido tratada desde enfoques formalistas, visiones diacrónicas y, en menor medida, con criterios sociolingüísticos. Desde esta última perspectiva contamos con aportaciones sobre el español canario (Troya & Pérez, 2011), venezolano (Navarro, 1990; Zabalegui, 2008), mexicano (Schwenter & Torres Cacoullos, 2014) y peninsular (Illamola & Vila, 2015). Son estudios con disparidad de alcance, corpus y criterios, por lo que es necesario el estudio en un corpus monolingüe que pueda ser replicado en otros lugares hispánicos.

Tras establecer algunas precisiones metodológicas previas que se derivan de la naturaleza de los datos del corpus, hemos hallado que, junto con los factores previamente señalados en estudios previos, son pertinentes otros más inusuales, como el semantismo verbal y la presencia del sujeto léxico. No obstante, la principal aportación de este trabajo es la comprobación de la influencia del factor social nivel de estudios, que se plasma en un patrón curvilíneo donde el grupo intermedio presenta porcentajes de posposición superiores a los otros grupos. Contribuyen especialmente a ese patrón las mujeres y los estratos de edad intermedios y mayores.
Direct object anaphora resolution in L1 English-L2 Spanish
Authors: García-Tejada Aída
Published: October 2022

This study investigates the written production of direct object (DO) anaphora in L2 Spanish by adult English
native speakers. It focuses on the use of clitics and full DPs in topic continuity, where highly salient topics are typically
recovered by clitics in native Spanish. A combination of pragmatic factors in subject anaphora resolution (referential ambiguity
and distance) and morphosyntactic factors in the acquisition of clitics (gender and animacy) was analyzed in 5 subcorpora from the
CEDEL2 (Corpus Escrito del Español L2). Following Learner Corpus Research methodology, 773 anaphoric DOs and
their antecedents were tagged across 150 texts (from low-intermediate to upper-advanced proficiency). Results showed that as
learner proficiency increases, the predominant anaphoric strategy shifts from redundant DP overuse to felicitous
pronominalization. Clitic avoidance is the general strategy intimately related to clitics’ morphosyntactic deficits at advanced
levels, but also to pragmatic principles supporting the Pragmatic Principles Violation Hypothesis (Lozano, 2016).