bluuebunny/crossref_metadata_2025_split huggingface dataset:
A unified scheme for rotation modulation and self-calibration of dual-axis rotating SINS
Authors: Fan Huiying , Xie Yuanping , Wang Zichao , Wang Lin , Luo Hui , Yu Xudong 
Published: July 2021

Abstract
Rotation modulation and self-calibration are the key techniques for error compensation of the strapdown inertial navigation system, which are generally implemented separately. The 16-sequence scheme is widely used for rotation modulation, while the 18-sequence scheme is used for self-calibration. To reduce the complexity of the practical operations, this paper proposes the combination of the rotation modulation scheme and the calibration path and six corresponding design principles of the scheme with both rotation modulation and self-calibration functions. A 48-sequence rotation scheme is designed, which unifies the scheme for self-calibration and rotation modulation. The simulation and experiment results prove that, compared with the 16-sequence rotation modulation scheme, the proposed 48-sequence scheme can reduce the mathematical platform misalignment angle errors and the sawtooth type velocity errors caused by the misalignments of the inertial measurement unit. Besides, its accuracy of self-calibration is better than that of the 18-sequence self-calibration scheme. The velocity errors and position errors can be reduced by about 0.1 m s−1 and 0.2 nm in 3 d.
Viscoelastic constitutive models and their fractional representatives to capture the time-dependent response of DEAs on sinus excitation
Authors: Karner Timi , Gotlih Janez 
Published: July 2021

Abstract
Dielectric elastomer actuators (DEAs) are subjected to creep especially in the first few excitation cycles. This paper deals with viscoelastic constitutive models and their fractional representatives to capture time-dependent deformation of DEA on sinus excitation. The sine voltage signal with three different frequencies and the same amplitude was used for deformation of the DEA. Basic constitutive models and their fractional representations of Kelvin–Voigt, Zener, solid linear model (SLM), Burger model and Kelvin–Voigt–Maxwell model were taken into consideration for finding the optimal model describing the behavior of the DEA. The simplicity of forming governing equations of motion derived with the help of Laplace transformation for basic and fractional constitutive models is shown in the work. Electrical force was calculated with the help of Maxwell equation. Responses of constitutive models were calculated with the help of Matlab. Constitutive parameters were optimized with the help of direct search and multiple starting point search method in Matlab. Fractional SLM was found to be the most optimal for describing time-dependent deformation on sinus excitation signal for the DEA. This work can be the basis on which control algorithms can be simulated for control of the DEA or any similar soft actuator.
Radiation reaction of betatron oscillation in plasma wakefield accelerators
Authors: Zeng Ming , Seto Keita 
Published: July 2021

Abstract
A classical model of radiation reaction for the betatron oscillation of an electron in a plasma wakefield accelerator is presented. The maximum energy of the electron due to the longitudinal radiation reaction is found, and the betatron oscillation damping due to both the longitudinal and transverse radiation reaction effects is analyzed. Both theoretical and numerical solutions are shown with good agreements. The regime that the quantum radiation takes effect is also discussed. This model is important for designing future plasma based super accelerators or colliders.
Synthesis of Silver-Alginate Nanocomposites Colloidal Assisted by Microwave Irradiation as Antibacterial Material
Authors: Susilowati E , Masykuri M , Ulfa M , Hardini R D 
Published: July 2021

Abstract
Synthesis of silver-alginate nanocomposite colloidal as an antibacterial material has been done. The colloidal is prepared through a chemical reduction method assisted by microwave irradiation with alginat as a reducing agent and stabilizer. Silver nitrate is used as a precursor and NaOH as an accelerator. The formation of silver-nanoparticles was indicated using a UV-Vis spectrophotometer based on localized surface plasmon resonance (LSPR) phenomenon. The shape and size of silver nanoparticles were characterized using TEM. Effect of storage in ambient temperature of silver-alginate nanocomposites colloidal was carried out during 14 weeks. Investigation of antibacterial activity of silver-alginate nanocomposite was carried out using diffusion method. The results showed that, the concentration of NaOH, irradiation time, AgNO3 concentration affect to the absorption band of the LSPR which related with the number of nanoparticles produced. Based on the TEM images, the size of silver nanoparticles increased with increasing concentration of AgNO3. Silver-alginate nanocomposites was stable for 12 weeks based on the absorption band of the LSPR. The greater the concentration of silver nanoparticles in silver-alginate nanocomposites, tends to the higher their antibacterial properties.
Applications of Laplace Transform in science and technology
Authors: Kokane Ashok S , Wadkar Balaji R 
Published: July 2021

Abstract
In the present paper, we discussed applications of Laplace Transform to solve the equations that occur in mathematical modeling of various engineering problems like simple electric circuit, in analysis and modeling of Mechanical system, in population growth, in conduction of heat equation (with example), in Bessel’s function and in economics. We interpreted a relation between beta and gamma function and applications to simultaneous differential equations with suitable example using Laplace Transform Method.
Simulation and discussion of CO2 flooding associated gas separation by mixed amine absorption method
Authors: Chen Bing , Zhao Qiong , Cui Weigang 
Published: July 2021

Abstract
Separating the CO2 from the associated gas is the key to improving resource utilization and reducing environmental pollution. It is confirmed that the MDEA-MEA mixture is used as the absorption liquid according to the composition and pressure of the associated gas in the current oil field. Taking a domestic CO2 flooding produced liquid as the research object. The separation process was simulated by Aspen HYSYS software, and compared with the actual absorption and separation situation. According to simulation calculation, for the associated gas with a CO2 proportion of 30%, the separation rate of CO2 by the system can reach 98.32%, and the purity of CO2 is 99.28%. Furthermore, it provides a technical example for rational use of simulation calculation to estimate the efficiency of CO2 separation by mixed amine absorption method in engineering.
Study on determination method of substitution degree of polyvinyl alcohol glutaraldehyde
Authors: Wang Wenbin , Zhang Jian , Min Jiangben , Du Weichao 
Published: July 2021

AbstractThe excess hydroxylamine hydrochloride was added to react with PVA crosslink, and the HCI was titrated with NaOH standard solution. The weight percentage of PVA crosslink in the sample was calculated to characterize the degree of substitution. The results show that this method can be used to analyze the degree of substitution of PVA and glutaraldehyde crosslinking reaction effectively with high accuracy and small standard deviation.
Relationship Between Organic Geochemistry and Hydrocarbon Preservation in Longmen Mountain Structural Belts
Authors: Liang Min , Wang Hui , Fan Yuhai 
Published: July 2021

Abstract
Based on the analysis data of biomarkers and group components of crude oil and asphalt, this paper analyzes the organic geochemical characteristics of hydrocarbon in this area and its relationship with hydrocarbon preservation, understands the preservation and damage of hydrocarbon reservoirs, and then evaluates the resource exploration prospects of main hydrocarbon-bearing structures. Comprehensive study shows that the Longmen Mountain thrust nappe belt experienced the influence of multistage tectonic movement, resulting in the destruction of hydrocarbon-bearing structures in different degrees in space. The northern part of the Longmen Mountain structural belts underwent strong deformation during Indosinian and Himalayan periods, and the organic geochemical indicators showed that the hydrocarbon-bearing structures preservation conditions in the area were poor; the southern part of the Longmen Mountain structural belts and the Western Sichuan depression had moderate internal structural deformation, the Jurassic and Cretaceous systems were well preserved, with large stratigraphic thickness and good hydrocarbon preservation conditions.
Research and field application of ultra high pressure hydraulic cutting technology in Gaohe coal minethe title of your paper here
Authors: Ji Fei , Lu Zhanjin 
Published: July 2021

Abstract
In order to improve the permeability of low permeability coal seam, improve the gas drainage efficiency of + 450m bedding boreholes in Gaohe mine, and ensure the safe and rapid excavation of + 450m level north wing air inlet roadway, ZGF-100 (a) type ultra-high pressure hydraulic slotting device suitable for the characteristics of 3 coal seam in Gaohe mine is developed. The feasibility and implementation scheme of high pressure water drilling and slotting integration technology are studied, and the slotting effect is preliminarily analyzed investigate. The research shows that the technology of using ultra-high pressure water to cut coal seam to cause cracks and increase permeability can effectively conduct the original cracks in the coal body, increase the gas drainage effect of boreholes along the seam, increase the drainage pure quantity by 1.8 ∼ 3.6 times, increase the effective drainage radius from 1.3m to 2.4m, and reduce the drilling engineering quantity by more than 50%. Hydraulic cutting technology can effectively improve the gas drainage efficiency of low permeability coal seam, which is worthy of promotion.
Identification of igneous reservoir fluid properties based on apparent formation water resistivity P1/2 method -- Taking Carboniferous igneous rocks in CH302, Junggar Basin as an example
Authors: Jin Ping , Hu Gang , Wang Xian , Cheng Zhongjiang , Zhang Shangming 
Published: July 2021

Abstract
In this paper, the application of apparent formation water resistivity P1/2 method to the identification of igneous reservoir fluid properties is explored. This method is applied to basalt and volcanic breccia in CH302 well area of Junggar basin, which has certain application value, but has certain limitations. When the apparent formation resistivity P1/2 method is applied to the fluid property identification of igneous reservoir, the identification effect will be affected by the accuracy of lithology classification, igneous fracture and oil bearing property.
Application of information technology in geological exploration
Authors: Wang Juan , Chen Fang , Yao Weihua , Huang Ligang , Wu Fan 
Published: July 2021

Abstract
With the development of modern exploration technology, the role of geological exploration is becoming more and more important, it is used in many fields. The development of information technology has gone deep into all fields of production and life, and its application in geological exploration has brought considerable development to oil and gas exploration and energy industry. The traditional oil and gas exploration and production technology is difficult to meet the huge demand for energy, and the application of information technology is a good solution to this problem. This paper studies current situation of information technology in geological exploration, the restrictive factors of the application of information technology in geological exploration and the restrictive factors of the application of information technology in geological exploration, and summarizes the relevant conclusions.
Investigation on microstructure and fracture behaviour of titanium alloy castings
Authors: Zhao Wenxia , Tao Chunhu , Liu Changkui 
Published: July 2021

Abstract
OM, SEM, EDS, XRD were used to investigate microstructure and element distribution of titanium alloy castings, mechanical properties was examined by tensile test and micro-hardness. Results of the study showed that the micro-hardness of the abnormal microstructure was higher than that of the normal, the brittle fracture behaviour was showed in abnormal microstructure and the plastic fracture behaviour was showed in normal. The content of Fe was detected at abnormal microstructure, which lead to the content of β phase of abnormal area far exceeded the normal area, and β flecks appeared. The segregation of Fe element is the root cause which led to forming abnormal structure and β flecks, as well as the sharp plasticity decreases of alloy. The segregation of Fe changes the structure of the alloy, which leads to the formation of brittle TiFe eutectic phase causing the increases the strength but reduces the alloy casting plasticity.
Visualization Research and Application of Uncertainty Method of Well Trajectory Based on ISCWSA Model
Authors: Ma Hongyan , Xu Xiaoou , Xu Hongguo , Song Xiaojian , Zhang Aibing , Wang Xuelong , Wang Yarong , Liu Wenmao , Dong Jinghui , Guo Yufeng 
Published: July 2021

Abstract
In order to improve the control accuracy of well trajectory and the visualization technology of drilling data, the measurement error source is analyzed based on MWD measurement principle, and the uncertainty calculation of well trajectory is discussed on the basis of ISCWSA error model; the algorithm is analyzed and designed, and the modeling process is given; Using Python as the programming language, the visualization software of well trajectory uncertainty is developed, which realizes the visualization of well trajectory and the visualization analysis of three-dimensional error ellipsoid of well trajectory uncertainty, and can directly see the size of well trajectory error and the trend of well progress; In the artificial island of Jidong Oilfield, the construction of slave well group with minimum anti-collision distance of 2.6 meters was completed. It provides a good theoretical reference for the wellbore anti-collision and wellbore trajectory control.
Study on the Applicability of a New Type of Bit in Ordovician - Cambrian Dolomite Formation of Tarim Basin
Authors: Liu Hongtao , Yang Chengxin , Zhou Jian , Wang Xiaoliang , Ding Feng , Song Guozhi 
Published: July 2021

Abstract
The Ordovician-Cambrian reservoirs in Tarim basin are characterized by complex geological structure, deep reservoir, and thick dolomite strata in the middle and deep formation. The dolomite formation is characterized by large content of chert, high dense lithology, high uniaxial compressive strength, prominent impact and heterogeneity of the formation, it was difficult for conventional drill bits to form stable effective cutting depth and prone to vortex damage, which leads to short drill footage, low ROP and long drilling cycle, it seriously restricted the efficient exploration and development of Cambrian subsalt reservoirs in this block. Therefore, experimental analysis of rock mechanics in the Cambrian dolomite formation was carried out to quantitatively evaluate the rock mechanics properties in this area. A new type of PDC bit was designed to improve the impact resistance and eddy resistance of single teeth, and the impact fatigue test was carried out and successfully applied in the field. The research results show that compared with the adjacent wells in the same interval and lithology, the footage is increased by 39%, and the ROP is increased by 84%, which has achieved obvious acceleration effect, providing technical reference and support for the efficient exploration and development of Cambrian pre-salt reservoirs in the Tarim Basin.
Study and Application on ROP-Enhancing Technology of Ordovician-Cambrian Dolomite Strata in Tarim Basin
Authors: Zhou Bo , Liu Yong , Liu Huiliang , He Renqing , Lu Hui , Zhang Chongyuan 
Published: July 2021

Abstract
The Ordovician-Cambrian dolomite formation in Tarim basin has certain characteristics such as poor drillability, long drilling cycle, difficulty in selecting drill bit and accelerating tool. In order to meet the requirements of efficient exploration and development of Cambrian oil and gas reservoirs, there is an urgent need to design high ROP bit and acceleration tool suitable for dolomite formation, optimize drilling parameters and improve ROP to form the technical scheme of drilling acceleration in dolomite formation. Therefore, the drillability of the Cambrian dolomite strata was studied. The experimental analysis was carried out according to the geological characteristics and rock mechanical parameters. Dual index drillability analysis method was used to evaluate the formation compactness, abrasiveness and other formation drillability characteristics. A new type of PDC bit was designed to improve the impact resistance and eddy resistance of single tooth, a three-dimensional vibration acceleration tool was selected to reduce the vibration of the bit, and combined with the optimization of drilling parameters, the technical scheme for acceleration of the Ordovician -Cambrian dolomite formation in Tarim Basin was finally formed, which was successfully field tested in Well A of Tarim Basin. The research results show that compared with the adjacent well B section, the average footage and the average ROP are increased by 47.8% and 32.0% respectively. Compared with the adjacent well C section, the average footage and average ROP increased by 37.0% and 29.5% respectively. The results provide technical reference and support for the efficient exploration and development of Ordovician - Cambrian reservoirs in Tarim Basin.
Study on the geological stress sensitivity of weak geotechnical engineering in the Three Gorges reservoir area
Authors: Qin Yujia , Tang Xin , Cheng Longfei , Guo Yuanchen , Yao Lei , Li Bin 
Published: July 2021

Abstract
Soft rock has the characteristics of poor engineering mechanics, and it is easy to change under the action of water or external load. This paper uses the pulse attenuation permeability meter to develop permeability test and coefficient of variation for weak rock with common engineering mechanical properties. Calculate and explore the geological stress sensitivity characteristics of weak rock engineering within the Three Gorges reservoir area. The conclusions are as follows: the permeability of weak rock in the Three Gorges reservoir area is less than 0.1mD, which belongs to the type of compact soft rock, among which the permeability of medium sandstone (0.048mD)> the permeability of fine sandstone (0.0055mD)> the permeability of mud shale (0.0047mD); the rock permeability coefficient of variation is greater than 0.7, with a strong heterogeneity. The permeability of soft rock has obvious anisotropy. The permeability of the vertical layer of medium-fine sandstone and silty mudstone is greater than the permeability parallel to the plane. The difference between the two is closely related to the physical difference between different lithologies. The permeability of siltstone, shale and sandstone rocks decreases exponentially with the increase of effective stress. The relationship between the permeability loss rates of various types of rock is: shale> siltstone> sandstone, indicating the same stress condition, page Rocks have higher stress sensitivity than siltstones and sandstones. This is mainly because the fractures in sandstone and siltstone are more developed than shale.
Soil Remediation and Construction Technology of Prefabricated Building Sleeve Grouting in Eco-city
Authors: Huo Tingting 
Published: July 2021

Abstract
The construction technology of prefabricated structure sleeve grouting is an advanced construction technology focusing on energy conservation and environmental protection, it can reduce the waste of resources and environmental pollution at the same time,and it also can greatly improve the quality and efficiency of construction by running a variety of construction procedures simultaneously.The author analyzes the sleeve grouting construction of the assembled structure, and puts forward some key technologies of grouting construction and control methods of heavy and difficult points in grouting construction, in order to provide reference for the majority of engineering construction personnel.
Research of land engineering and soil classification from the perspective of Geological Sciences
Authors: Cheng Jie , Yang Liangyang , Wu Dan 
Published: July 2021

Abstract
In order to speed up the construction of land science, solve land problems and promote the sustainable and rational development and utilization of land resources. In this paper, we start with recognizing the existing problems of land resources, discuss the subject construction of land engineering, and discuss its core research. The results show that there are some problems in the land resources, such as the continuous expansion of land desertification area, serious soil erosion and soil pollution; In order to solve the land problem, it is proposed to speed up the construction of land engineering discipline and vigorously carry out the research work with the organic reconstruction of soil as the core.
Research on Cooling Effect on Heading Face of Spray by CFD in Metal Mines
Authors: Li Chen , Chen Guowei , Zhang Teng , Zhao Yanyang 
Published: July 2021

Abstract
In order to study the treatment of mine heat disaster and improve the thermal environment of heading face. Taking the heading face of a metal mine as the research object, a physical model is established, and the temperature distribution of the heading face is numerically simulated by using computational fluid dynamics (CFD) software. The results show that spray can significantly reduce the temperature on the heading face. It provides theoretical guidance for the spray device in the field of mine thermal damage control.
Research And Analysis on Anti-Cracking Performance and Hydration Heat of Shear Wall in Cold, Dry and Windy Area
Authors: Luo Fajiang , Luo Zuoqiu , Meng Zhaohu , Han Guangzhao , Liu Manqing , Huang Fajing , Zhang Dafa , Wu Shixian , Tong Xiaogen 
Published: July 2021

Abstract
Gansu Province is located in a cold, dry and windy area. The whole province is dry with little rain, large temperature difference between day and night, and long cold time. The quality of raw materials used for concrete is unstable, and cracks exist in all kinds of building concrete walls, which has a great impact on the quality and forming effect of buildings, and there are many types of concrete cracks. In order to improve the problem of concrete cracks, we need to start from the causes of concrete cracks. The most effective way to control and reduce concrete cracks is to correctly judge and analyze the causes of concrete cracks. Through the study of concrete: raw material properties, mixture properties, mechanical properties and other factors and the relationship between cracks. At the same time, two kinds of structural measures are added in the construction site, i.e. reinforcing mesh and concrete curing method, to study their influence on concrete cracks.