bluuebunny/crossref_metadata_2025_split huggingface dataset:
Fundamental and higher-order excited modes of radial oscillation of neutron stars for various types of cold nucleonic and hyperonic matter
Authors: Barta Dániel 
Published: July 2021

Abstract
This research paper complements our earlier qualitative study of the effect of viscosity and thermal conductivity on the radial oscillation and relaxation of non-rotating neutron stars. The fundamental and first two lowest-frequency excited modes of radial oscillation have been computed in the high nuclear density regime for a set of seven realistic equations of state (EoS) as functions of central energy density. Various types of zero-temperature EoS of cold nucleonic and hybrid nucleon–hyperon–quark matter models are used in the inner core to determine the internal structure in and around the hydrostatic equilibrium states and investigate the influence of each EoS on the dynamical behavior of non-rotating neutron stars. We confirm the principal results of earlier, related studies that suggest an underlying correlation between the frequency spectrum of the fundamental oscillation mode and the variation of the adiabatic index over the high nuclear-density regime. We provide valuable information to impose further constraints on the plausible set of realistic EoS models, in addition to the practical applications for the rapidly evolving field of asteroseismology of compact objects.
Light emission from halide perovskite semiconductors: bulk crystals, thin films, and nanocrystals
Authors: Yamada Takumi , Handa Taketo , Yamada Yasuhiro , Kanemitsu Yoshihiko 
Published: July 2021

Abstract
Halide perovskites are attracting attentions as a novel class of semiconductor materials for devices such as solar cells, light-emitting diodes, lasers, and photodetectors. High-quality perovskite crystals can be fabricated with different forms such as bulk crystals, thin films and nanocrystals. These different geometries influence photoluminescence (PL) properties, and the characteristic differences of PL spectra between bulk single crystals and polycrystalline thin films are originated from the carrier diffusion and PL reabsorption. Nanocrystals exhibit optical properties different from their bulk counterparts due to size effects. Furthermore, the bandgap energies of perovskites can be tuned over a wide range by controlling the constituents. Unique anti-Stokes PL and high-order harmonic generation have also been demonstrated in nanocrystals in addition to bulk crystals and thin films. In this review article, we provide a brief summary of the PL and nonliear light emission properties of perovskite semiconductors. We first discuss the influence of the carrier diffusion and PL reabsorption on the PL spectra and dynamics of thick samples, and then the impact of the electron–phonon interactions on PL spectra in bulk crystals and nanocrystals. The last part of this review is devoted to the light emission phenomena induced by nonlinear optical processes in perovskites.
Invariant-based inverse engineering for fast nonadiabatic geometric quantum computation
Authors: Li Wei 
Published: July 2021

Abstract
In this paper, based on first given Lewis–Riesenfeld invariant depicted by a unit vector in parameter space, we inverse engineering the time-dependent Hamiltonian of a system with su(2) Lie algebraic structure. The introduced method is then applied to investigate nonadiabatic Abelian geometric quantum computation. We demonstrate that, by employing the nonadiabatic Berry phase generated through nonadiabatic periodic evolution, a driven two-level system which undergoes a single cyclic evolution along a loop path in Bloch space can realize a universal set of one-qubit gates. Subsequently, under consideration of the influence of the systematic error and dissipation on nonadiabatic process, the result reveals arbitrary one-qubit gate can be implemented with a high fidelity. Moreover, to complete the universal set, arbitrary controlled-U gate is designed by utilizing a driven system consisted of a pair of coupled spin subsystems.
Spatial configuration and time of day impact the magnitude of urban tree canopy cooling
Authors: Alonzo Michael , Baker Matthew E , Gao Yuemeng , Shandas Vivek 
Published: July 2021

Abstract
Tree cover is generally associated with cooler air temperatures in urban environments but the roles of canopy configuration, spatial context, and time of day are not well understood. The ability to examine spatiotemporal relationships between trees and urban climate has been hindered by lack of appropriate air temperature data and, perhaps, by overreliance on a single ‘tree canopy’ class, obscuring the mechanisms by which canopy cools. Here, we use >70 000 air temperature measurements collected by car throughout Washington, DC, USA in predawn (pd), afternoon (aft), and evening (eve) campaigns on a hot summer day. We subdivided tree canopy into ‘soft’ (over unpaved surfaces) and ‘hard’ (over paved surfaces) canopy classes and further partitioned soft canopy into distributed (narrow edges) and clumped patches (edges with interior cores). At each level of subdivision, we predicted air temperature anomalies using generalized additive models for each time of day. We found that the all-inclusive ‘tree canopy’ class cooled linearly at every time (pd = 0.5 °C ± 0.3 °C, aft = 1.8 °C ± 0.6 °C, eve = 1.7 °C ± 0.4 °C), but could be explained in the afternoon by aggregate effects of predominant hard and soft canopy cooling at low and high canopy cover, respectively. Soft canopy cooled nonlinearly in the afternoon with minimal effect until ∼40% cover but strongly (and linearly) across all cover fractions in the evening (pd = 0.7 °C ± 1.1 °C, aft = 2.0 °C ± 0.7 °C, eve = 2.9 °C ± 0.6 °C). Patches cooled at all times of day despite uneven allocation throughout the city, whereas more distributed canopy cooled in predawn and evening due to increased shading. This later finding is important for urban heat island mitigation planning since it is easier to find planting spaces for distributed trees rather than forest patches.
Finite Element Calculation of Whole Ship Structure Strength of 1500DWT Modified Bulk Cement Barge
Authors: Ren Jinyu , Xu Jing 
Published: July 2021

Abstract
According to the structure of the original 1700DWT barge and the requirements of “Code for Construction of Steel Inland Ships (2012)”, the dimensions of each component will be redesigned. Then use MSC.Patran to establish the whole ship finite element model, assign element properties according to the newly designed dimensions, and apply the load according to the principle of unfavorable load combination under different working conditions. Use MSC. Nastran to perform yield strength analysis. The calculations were carried out to carry out load analysis and calculation under typical working conditions to obtain the detailed stress distribution and deformation of the whole ship. The results show that it is feasible and reliable to use the method of direct calculation of the structural strength of the whole ship.
Study on Calculation and Analysis of Foundation Settlement in Cooling Tower
Authors: Zhang Jianyou , Du Rong 
Published: July 2021

Abstract
Based on the foundation characteristics of the 1200 m2 hyperbolic natural draft cooling tower in a power plant, and after analyzing many kinds of standards, the method is decided which could be used for foundation Settlement Calculation of the foundation in the cooling tower; The results of calculation are analyzed, when using natural foundation, the foundation Settlement deformation of the cooling tower can satisfy the design requirements.
Experimental research on the laws of acidification and salinization under the conditions of Ionic rare earth leaching and water Leaching
Authors: Chen Bin , Chen Guoqiang , Huo Hanxin , Zhu Yibin , Zhai Wenlong 
Published: July 2021

Abstract
In the ionic rare earth mining,ammonium sulfate is used as a leaching agent for in-situ leaching, the concentration of ammonium sulfate is 2%∼3%, and the pH is 4∼5, leading to soil acidification and increased salt content. In this paper,taking a rare earth mining area in Guangdong as the research object, carried out soil column simulation test research. After leaching with water for the soil column that complete leaching, in condition of using different leaching agents of pH values and different water leaching process characteristics, the variation of pH and total salt content was studied. The results show that, after leaching ,the mineral sample changed from mild acidification to non-acidification, and the the salt content of the mineral sample was effectively reduced, the salt leaching rate is above 57%. The research conclusions laid a theoretical foundation for soil acidification and salinization control in ion-type rare earth mining areas.
Integrated Petrophysical Evaluation of Shale Gas Reservoirs for Wufeng-Longmaxi Formation in Southeast Chongqing
Authors: Yan Ping , Kou Xiaopan , Hu Gang , Yin Qian , Zhang Lina , Wang Wei , Lai Fuqiang 
Published: July 2021

Abstract
Shale gas is an important unconventional natural gas resource. Different from conventional oil and gas exploration, gas shale is not only the source rock of natural gas, but also the cap rock and reservoir. This paper presents a logging interpretation method for comprehensive evaluation of shale gas. Taking well A in southeast Chongqing from Sichuan Basin as an example, the shale gas reservoir of Wufeng-Longmaxi formation is evaluated. This method makes full use of conventional logging data (gamma ray, array lateral resistivity, density, neutron, acoustic, spectral gamma ray), unconventional log data (NMR Nuclear Magnetic Resonance, ECS Elemental Capture Spectroscopy) and core experiment data (X-ray Diffraction, Tight Rock Analysis, Methane Adsorption Isotherm). This method of combining logging data with core measurement can provide mineralogy, porosity, permeability, saturation, kerogen volume, total organic carbon content, absorbed gas content and free gas content. The methods provide a means to understand the petrophysical properties and reservoir quality of Wufeng-Longmaxi shale. This information can help to determine the “sweet spot” along the vertical to land and design a selective completion strategy to optimize well productivity.
Sensitivity Analysis of the Parameters Affecting Bottom-hole Pressure during Foam Underbalanced Drilling
Authors: Zhang Xiaoning , Li Lingdong , Zhang Jianli , Duan Luyi , Wang Guangtai 
Published: July 2021

Abstract
With many advantages of protecting reservoir, increasing drilling speed and high capacity in carrying cuttings, foam drilling is suitable for drilling through the aquifer and natural fractured formation, and has been developed fast since 1990s. However, the change of the foam physical properties along wellbore, and the flowing state of the foam in the annulus is complex. Therefore, it is difficult to optimize the design of hydraulic parameters for foam drilling. In order to solve this problem, the mathematical model for foam-cutting flowing in annulus has been developed. In addition, the sensitivity analysis has been conducted about the factors affecting the parameters of foam drilling and the characteristics of foam flowing. The analyzing results can provide the foundation for designing the hydraulic parameters of foam drilling.
Coal Consumption Determination Method and Its Application Based on Actual Running State for Unit
Authors: Wang Jiayong , Deng Debing , Zhao Qingsen , Zhang Ding , Yang Jie , Chen Wei , Dai Junke , He Bulang 
Published: July 2021

Abstract
In the daily energy-saving statistics of coal-fired power stations, the imbalance of the total standard coal consumption often occurs. The fundamental reason is that the boundary conditions of the steam turbine side heat rate calculation and the boiler efficiency calculation are not unified. The article first analyzes the existing calculation methods, and points out that the anti-equilibrium calculation of boiler thermal efficiency lies in various loss calculations, and the key to the calculation of steam turbine heat consumption rate lies in the calculation of heat absorption. The heat consumption rate of the steam turbine is based on the flow into the turbine. The loss of working fluid on the turbine side, such as oxygen exhaust, high-pressure operation exhaust, sampling, valve leakage, etc., have been taken into account. Sampling, heat tracing in the ammonia station, and leakage from the boiler side run-off do not affect the boiler efficiency, nor the calculation of the turbine heat consumption rate, but affect the overall operation level of the unit. This article researchs the calculation method of coal consumption for power supply,taking a 600MW condensing power plant as an example, the main reasons for the difference in calculation results are analyzed, which lays the foundation for energy-saving diagnosis and energy-saving potential of the whole plant.
Effect of volcanic activities on the characteristic of sedimentary and sedimentary facies model-- Taking the Jiangbasitao Formation in Wulungu area as example
Authors: Ni Shengli , Yu Hongzhou , Sun Hongzhen , Wang Qianjun , Xiong Zhengrong , Bai Zhongcai 
Published: July 2021

Abstract
At present, the northern margin of Junggar Basin is one of the key zone in oil-gas exploration fields. For the purpose of explaining the question about the effect of volcanic activities on the characteristic of sedimentary, with the Wulungu area in the northern margin of Junggar Basin, the sedimentary characteristics was studied comprehensively using methods of core, drilling and a large number of sedimentologic experiment. The results have confirmed that the types of sedimentary facies, mainly marine. Combining with the construction environment, the sedimentary facies model (inter-arc basin and back-arc basin) were established for this area.
Sedimentary characteristics and evolution model of the late Permian in the periphery of the Bogda Mountain
Authors: Wang Yue , Zhang Kuihua , Xiong Wei , Yu Hongzhou , Zhang Guanlong , Wang Yuxin , Xue Yan 
Published: July 2021

Abstract
The Upper Permian around Bogda Mountain develops favorable reservoir sand bodies which show good oil and gas display. Further study of the sedimentary characteristics and evolution models has guiding significance towards petroleum exploration. Through detailed obervation and measurement of the Permian in the typical profile of the periphery of Bogda Mountain, combined with the well drilling and logging data and the core data of the Chaiwobao depression, the strata characteristics, the sedimentary facies types and the distribution features of the studying area were carefully analysized, furtherly, the sedimentary evolution model of the Upper Permian was discussed. It was revealed that the Quanzijie Formation, the Wutonggou formation and the Guodikeng Formation were formed from the bottom up in the late Permian in the periphery of Bogda Mountain, which was a transgression sedimentary process. During the sedimentary period of Quanzijie Formation, the uplift amplitude of Bogda Mountain was relatively large. Alluvial fan and fan delta facies are mainly developed on the north and south sides of Bogda Mountain. During the sedimentary period of Wutonggou Formation, with the uplift amplitude of bogda mountain gradually decreased, the northern margin of bogda mountain was mainly deposited by braided river and meandering river, while the southern margin was still mainly deposited by alluvial fan. During the sedimentary period of Guodingkeng Formation, with the gradual shrinkage of Bogda Mountain, the northern margin of Bogda Mountain mainly developed the flood plain deposits of the meandering river, which reflected that the material supply capacity was weakened.
Main controlling factors and depositional model of source rock of Paleogene Shahejie Formation in Liaodong Bay Depression
Authors: Hou Qingjie , Jin Qiang , Zhang Rucai , Liu Haojie , Wang Yuping , Sheng Wenbo 
Published: July 2021

Abstract
In the Paleogene Shahejie Formation of Liaodong Bay Depression, two sets of main source rocks are developed, namely the Es1 and the Es3 Formation. In order to determine the characteristics, main controlling factors and patterns of source rock development, firstly, we comprehensively use source rock geochemical and logging data to establish TOC logging prediction models for source rocks in two formations; secondly, we predict the TOC plane distribution of the two layers separately according to the prediction model; then, we use the tectonic subsidence history and sedimentary background data of the study area to analyze its relationship with the source rock development and determine the main controlling factors for the source rock development; finally, the source rock deposition models are established according to the main controlling factors of source rock development. The results show the source rock of the Es1 has high abundance of organic matter, the average TOC of the sample is as high as 2.41%, but the thickness of the source rock does not exceed 130 m; the abundance of source rocks in the Es3 is slightly worse than that of the Es1, the average TOC of the samples is 1.75%, the thickness of source rocks is generally larger, mainly 200-350 m; the rate of tectonic subsidence controls the thickness of the source rock, the amount of fracture extension controls the distribution shape of the source rock, and the degree of water stratification controls the degree of source rock enrichment; in the Es1 Formation, the source rock deposition model is the deposition model of the salinity layered water body in the saline lake basin; in the Es3 Formation, the source rock deposition model is the deposition model of deep water temperature stratification in the separated lake basin. To determine the main controlling factors and depositional patterns of source rock development provides a direction for subsequent exploration of favorable areas.
Pore fluids evolution in the sandstone of rift basins: a case study of Dongying sag, Jiyang depression, East China
Authors: Meng Wei , Ren Xianli , Jiang Yue , Li Songxi , Lin Ru 
Published: July 2021

Abstract
Pore fluids in basins control the migration of material and energy in sedimentary basin. Make sure pore fluids evolution process would be important for high-quality reservoir prediction. In this study, we pay attention on Dongying sag, which located in the eastern of Jiyang depression, Bohai Bay basin. We collected core sample for thin section observation and SEM, to determine diagenetic sequence in sandstone of study area. Take geological characteristics of study area into consideration, make sure the source of diagenetic products. At last, we deduce the pore fluids evolution process in study area.
Influence Factors of Pressure Attenuation Gradient and its Reservoir Forming Control - A Case Study of Bonan Sag in Bohai Bay Basin
Authors: Feng Yuelin , Zhang Tianjiao , Wang Yongshi , Mu Xing , Xiong Wei , An Tianxia , Wang Yong 
Published: July 2021

Abstract
As the dynamic condition of oil and gas migration, the change rate of overpressure has a certain relationship with the mode of oil and gas migration. In order to quantitatively identify the mode of oil and gas migration in overpressure basins, the influence of different transmission modes on pressure attenuation gradient is simulated, and the application and discussion are carried out in Bonan sag of Bohai Bay Basin. The influence of different transmission modes on the pressure attenuation gradient is discussed by single factor simulation method. Taking Bonan sag as an example, the process of overpressure fluid migration and accumulation is discussed combined with the evolution process of pressure attenuation gradient. The results show that fault activity has the greatest influence on pressure attenuation gradient, followed by fault dip angle and fault distance. the influence degree of physical properties of skeleton sand body, sand body dip angle and sand body thickness on pressure attenuation gradient decreases in turn; For the fault-sand consistent transport, it mainly depends on the combined effect of the dip angle and resistance of the transport system. The critical value of the fault or sand body transport in Bonan sag is 58.8MPa/km. On this basis, combined with the evolution law of pressure attenuation gradient, it is considered that the overpressure fluid in the deep sag migrates along the oil source fault to the fault terrace zone and the overpressure center distribution of the oil and gas ring in the deep sag. The overpressure oil and gas mainly migrate laterally along the sand body, and the oil and gas are distributed contiguously. In gentle slope zone, oil and gas distribute sporadically at structural height.
Investigation of Drag-Reduction Effect of Super-Hydrophilic Surface in Laminar Microchannel Flow
Authors: Luo Haoyu , Lu Lichang , Hao Yu , Li Xiang , Dong ZhiLi , Liu Yang , Li Yuanzhe 
Published: July 2021

Abstract
In previous studies of newly fabricated surface-coating materials, the super hydrophilic surface etched by Cu2+/HNO3 exerts higher drag-reduction effect at low Reynolds numbers than the modified superhydrophobic surface even with similar surface structure. In this paper, both experimental and modelling fluid dynamics studies are used to invest the drag-reduction and flow field for these super hydrophilic surfaces in the microchannel. The experimental results showed that the drag-reduction rate would gradually decrease with the velocity increment of medium. Besides, the dissolved gas does play a key role in reducing the shear stress in the near wall flow field by forming the non-shear air/water interface and increasing its wall-slippage effect. Moreover, the flow-field stimulation analysis provides more intuitive schematic diagram velocity magnitude and pressure changes inside the microchannel, and the surface roughness obtained by chemical etching is capable to enhance the drag-reduction effect as well.
Hydrocarbon accumulation characteristics and model of deep-seated glutenite on steep slope zone of fault basin: a case study of the E2s4 Member in Yanjia area, Dongying Sag
Authors: Mao Shuwei , Hao Xuefeng , Gong Jianqiang , Zhang Pengfei , Qiu Yibo , Wang Wenbin 
Published: July 2021

Abstract
Deep-seated oil and gas have become the focus of hydrocarbon exploration at home and abroad. Strengthening the research on the deep-seated hydrocarbon accumulation is the key to efficient exploration of oil and gas. Based on the analysis of light component and organic matter types of crude oil, the results show that there are two sets of source rocks in the E2s42 sub-member in Yanjia area, which are self-derived reservoirs. The reservoir types of the deep-seated glutenite in E2s4 member are mainly lithologic and lithologic-tectonic reservoirs. The distribution sequence is characterized by oil reservoirs in the high part of the structure, oil cracking gas reservoirs in the deep part, and condensate oil and gas reservoirs in the middle part. Further analysis shows that there are three layer pressure zones: overpressure zones (PCOE >1.4), the pressure transition zone (1.1 <PCOE<1.4) and the normal pressure zone (0.9 <PCOE<1.1), and the part near the upper fan area is dominated by the crude oil from the E2s42 sub-member, the middle fan area is dominated by the mixed source oil, and the lower fan area is dominated by the crude oil from the E2s41 sub-member. Compared with the characteristics of hydrocarbon migration and accumulation in middle and shallow strata, hydrocarbon accumulation in deep-seated glutenite is more controlled by hydrocarbon migration power and reservoir physical property. The secondary pore development zones are the key reservoir spaces for hydrocarbon in deep layer. On the basis of the above analyses, the hydrocarbon accumulation model of “source-reservoir-pressure” is constructed, which further reveals the hydrocarbon differential enrichment law of deep-seated glutenite, and guides the efficient exploration of oil and gas in Yanjia area, Dongying Sag.