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Testing methods for 1100 kV UHVDC transformer 认领 引用 被引量：2
1
作者 Thomas Hammer Rene Wimmer +1 位作者 Karsten Loppach Ronny Fritsche 《Global Energy Interconnection》 2018年第2期103-107,共5页
1 Development of UHVDC transmission capabilities The economical development of China is closely connected with safe and reliable power supply.Load centers e.g.in central and eastern China need huge amounts of electric... 1 Development of UHVDC transmission capabilities The economical development of China is closely connected with safe and reliable power supply.Load centers e.g.in central and eastern China need huge amounts of electrical power.Available energy resources and consumption areas are often distributed inverse.As a consequence it is necessary to import electrical power to load center areas in an economic and efficient way. 展开更多
关键词 UHVDC In Testing methods for 1100 kV UHVDC transformer
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A Mini Review on Testing Methods for Mechanical Properties of Natural Fibre Honeycomb Sandwich Structure and Fractography Analysis 认领 引用 被引量：1
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作者 Nahiyan Al-Azad Nur Hafidah Binti Dedifitrianto Mohd. Kamal Mohd. Shah 《Journal of Materials Science and Chemical Engineering》 2021年第5期29-38,共10页
This paper is a review of the past research of mechanical testing methods for natural fibre honeycomb sandwich structure as well as failure modes analysis at a microscopic level by using Scanning Electron Microscope (... This paper is a review of the past research of mechanical testing methods for natural fibre honeycomb sandwich structure as well as failure modes analysis at a microscopic level by using Scanning Electron Microscope (SEM). As the world is garnering attention towards renewable resources for environmental purposes, studies of natural fibre have been increasing as well as the application of natural fibre throughout various industries such as aerospace, automobiles, and construction sectors. This paper is started with brief information regarding the honeycomb sandwich structure, introduction to natural fibre, its applications as well as the factors affecting the performances of the structure. Next, the mechanical testing methods are listed out as well as the expected outcomes obtained from the respective testing. The mechanical properties are also identified by conducting lab tests according to the ASTM standard for sandwich and core structures. The microstructure of the deformed samples is then examined under Scanning Electron Microscope (SEM) by using different magnifications to study the failure mechanisms of the samples. The images obtained from the SEM test are analyzed by using fractography which will show the failure modes of the samples. This article is based on past research conducted by professional on the related topic. 展开更多
关键词 Natural Fibre Honeycomb Sandwich Structure Testing Methods ASTM Standard SEM Test
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Research on the Testing Methods of Instrumental System in the Marine Magnetic Survey 认领 引用 被引量：1
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作者 边刚 刘雁春 +2 位作者 于波 肖付民 卞光浪 《Marine Science Bulletin》 2007年第2期1-11,共11页
Testing methods of instrumental system in the marine magnetic survey have been studied in this paper, and the feasibility of each method has been testified by the observed data. The conclusion shows that the method br... Testing methods of instrumental system in the marine magnetic survey have been studied in this paper, and the feasibility of each method has been testified by the observed data. The conclusion shows that the method brought out can effectively eliminate the systematic error caused by the instrumental system, and greatly improve the surveying precision and the reliability of the survey results. 展开更多
关键词 Marine magnetic survey instrumental system testing method
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Provenance of Coloured Gemstones-Availability,Testing Methods,Future Trends 认领 引用 被引量：1
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作者 Lore Kiefert Klemens Link 《宝石和宝石学杂志》 2018年第S1期145-146,共2页
Gemstones have fascinated mankind forever,and people traveled far to find them.The Silk Road is one of the most traditional trade routes in the middle ages that was used to bring the precious stones to the European ma... Gemstones have fascinated mankind forever,and people traveled far to find them.The Silk Road is one of the most traditional trade routes in the middle ages that was used to bring the precious stones to the European market.Later,emeralds from Colombia were shipped via the ocean to the Old World. 展开更多
关键词 Provenance of Coloured Gemstones-Availability,Testing Methods,Future Trends
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The Development and Standardization of Testing Methods for Genetically Modified Organisms and their Derived Products 认领 引用 被引量：35
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作者 Dabing Zhang Jinchao Guo 《Journal of Integrative Plant Biology》 SCIE CAS CSCD 2011年第7期539-551,共13页
As the worldwide commercialization of genetically modified organisms(GMOs)increases and consumers concern the safety of GMOs,many countries and regions are issuing labeling regulations on GMOs and their products.Analy... As the worldwide commercialization of genetically modified organisms(GMOs)increases and consumers concern the safety of GMOs,many countries and regions are issuing labeling regulations on GMOs and their products.Analytical methods and their standardization for GM ingredients in foods and feed are essential for the implementation of labeling regulations.To date,the GMO testing methods are mainly based on the inserted DNA sequences and newly produced proteins in GMOs.This paper presents an overview of GMO testing methods as well as their standardization. 展开更多
关键词 DNA genetically modified organisms protein standardization testing methods
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A review of test methods for uniaxial compressive strength of rocks:Theory,apparatus and data processing 认领 引用 被引量：3
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作者 Wei-Qiang Xie Xiao-Li Liu +2 位作者 Xiao-Ping Zhang Quan-Sheng Liu En-ZhiWang 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2025年第3期1889-1905,共17页
The uniaxial compressive strength(UCS)of rocks is a vital geomechanical parameter widely used for rock mass classification,stability analysis,and engineering design in rock engineering.Various UCS testing methods and ... The uniaxial compressive strength(UCS)of rocks is a vital geomechanical parameter widely used for rock mass classification,stability analysis,and engineering design in rock engineering.Various UCS testing methods and apparatuses have been proposed over the past few decades.The objective of the present study is to summarize the status and development in theories,test apparatuses,data processing of the existing testing methods for UCS measurement.It starts with elaborating the theories of these test methods.Then the test apparatus and development trends for UCS measurement are summarized,followed by a discussion on rock specimens for test apparatus,and data processing methods.Next,the method selection for UCS measurement is recommended.It reveals that the rock failure mechanism in the UCS testing methods can be divided into compression-shear,compression-tension,composite failure mode,and no obvious failure mode.The trends of these apparatuses are towards automation,digitization,precision,and multi-modal test.Two size correction methods are commonly used.One is to develop empirical correlation between the measured indices and the specimen size.The other is to use a standard specimen to calculate the size correction factor.Three to five input parameters are commonly utilized in soft computation models to predict the UCS of rocks.The selection of the test methods for the UCS measurement can be carried out according to the testing scenario and the specimen size.The engineers can gain a comprehensive understanding of the UCS testing methods and its potential developments in various rock engineering endeavors. 展开更多
关键词 Uniaxial compressive strength(UCS) UCS testing methods Test apparatus Data processing
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Research on Software Security Testing Mode Based on Open Network Environment 认领 引用
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作者 Xiaoqing Jia 《Journal of Electronic Research and Application》 2025年第4期290-296,共7页
Starting with the goal and significance of software security testing,this paper introduces the main methods of software security testing in the open network environment,including formal security testing,white box test... Starting with the goal and significance of software security testing,this paper introduces the main methods of software security testing in the open network environment,including formal security testing,white box testing,fuzzy testing,model testing,and fault injection testing.A software security testing method based on a security target model is proposed.This paper provides new ideas for software security testing,better adapts to the open network environment,improves the efficiency and quality of testing,and builds a good software application environment. 展开更多
关键词 Network environment Software Safety performance Test method Safety protection
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Field tests on compressive bearing capacity of cast-in-situ pile and pre-bored grouted PHC pile 认领 引用
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作者 Jiajin Zhou Rihong Zhang +2 位作者 Xiaonan Gong Jianlin Yu Tianlong Yan 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2026年第7期5759-5769,共11页
This paper presents a group of full-scale test results of cast-in-situ pile and pre-bored grouted prestressed high-strength concrete(PHC)pile(bored PHC pile)in deep soft soils.The pile shaft of castin-situ pile was ar... This paper presents a group of full-scale test results of cast-in-situ pile and pre-bored grouted prestressed high-strength concrete(PHC)pile(bored PHC pile)in deep soft soils.The pile shaft of castin-situ pile was arranged with strain sensors,and the bored PHC pile was arranged with both strain sensors and fiberoptic sensors.The side and base resistances of bored PHC pile and cast-in-situ pile were analyzed according to the fieldtest results.The research results showed that the 900 mmdiameter bored PHC pile revealed better compressive capacity compared to 1000 mm-diameter cast-insitu pile.The side resistance of bored PHC pile was also greater than that of cast-in-situ pile due to the existence of grout body.The expanding base grout body of bored PHC pile also improved its base resistance,as the base grouting process could increase base area and improve the properties of soil around pile base as well.The fieldtest results are valuable for the application of bored PHC pile and castin-situ pile in engineering practice. 展开更多
关键词 Cast-in-situ pile Bored pre-stressed high-strength concrete(PHC)pile Side resistance Base resistance Cone penetration test(CPT)method
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Drilling parameter acquisition and rock strength determination on rotary-percussive drilling for drill-and-blast excavation 认领 引用
9
作者 Wendal Victor Yue Manchao He +3 位作者 Hehua Zhu Zhongwen Yue Sichen Long Mengjia Zhang 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2026年第6期4278-4298,共21页
Drill-and-blast excavation design requires a comprehensive understanding of the strength properties of the surrounding rock mass in the blast area.However,due to the absence of reliable methods for determining rock st... Drill-and-blast excavation design requires a comprehensive understanding of the strength properties of the surrounding rock mass in the blast area.However,due to the absence of reliable methods for determining rock strength in situ,blast designs commonly rely on laboratory test results derived from limited core samples.To address this limitation,this study proposes a novel method for estimating in situ rock compressive and tensile strengths using drilling monitoring data.Drilling monitoring is a technique that interprets the properties of the drilled medium through recorded drilling parameters.A rotary-percussive drilling test system was developed for this purpose,incorporating an actual rotary-percussive drill from a blasthole drill rig along with integrated monitoring systems.Importantly,a complete procedure for acquiring five key drilling parameters,including thrust force,rotation speed,torque,drilling rate,and percussive pressure are described.These parameters were used to calculate the drilling work done,defined as the energy required to excavate a unit volume of rock.The results indicate a nonlinear correlation between drilling work done and percussive pressure,which corresponds to the compressive and tensile strengths of the tested rocks.Furthermore,applying confining stress to rock samples was found to increase the drilling work done,reflecting a higher energy demand for drilling under confined conditions.This observation is consistent with rock mechanics principles,wherein rock strength increases under confining pressure.Thus,this study demonstrates that drilling monitoring tests can effectively indicate rock strength under in situ stress conditions.The findings offer practical implications for real-time in situ rock strength assessment,thereby bridging the gap between drilling monitoring research and rock mechanics applications. 展开更多
关键词 Drilling monitoring study Rotary-percussive drilling Drill-and-blast Geotechnical in situ testing method In situ rock strength
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Testing method of rock structural plane using digital drilling 认领 引用 被引量：6
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作者 Qi Wang Yuncai Wang +4 位作者 Bei Jiang Hongke Gao Fenglin Ma Dahu Zhai Songlin Cai 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2024年第7期2563-2578,共16页
The rock mass consists of rock blocks and structural planes,which can reduce its integrity and strength.Therefore,accurately obtaining the characteristics of the rock mass structural plane is a prerequisite for evalua... The rock mass consists of rock blocks and structural planes,which can reduce its integrity and strength.Therefore,accurately obtaining the characteristics of the rock mass structural plane is a prerequisite for evaluating stability and designing supports in underground engineering.Currently,there are no effective testing methods for the characteristic parameters of the rock mass structural plane in underground engineering.The paper presents the digital drilling technology as a new testing method of rock mass structural planes.Flawed rock specimens with cracks of varying widths and angles were used to simulate the rock mass structural planes,and the multifunctional rock mass digital drilling test system was employed to carry out the digital drilling tests.The analysis focuses on the variation laws of drilling parameters,such as drilling pressure and drilling torque,affected by the characteristics of prefabricated cracks,and clarifies the degradation mechanism of rock equivalent compressive strength.Additionally,an identification model for the characteristic parameters of rock mass structural planes during drilling is established.The test results indicate that the average difference of the characteristics of prefabricated cracks identified by the equivalent compressive strength is 2.45°and 0.82 mm,respectively.The identification model while drilling is verified to be correct due to the high identification accuracy.Based on this,a method for testing the characteristic parameters of the surrounding rock structural plane while drilling is proposed.The research offers a theoretical and methodological foundation for precise in situ identification of structural planes of the surrounding rock in underground engineering. 展开更多
关键词 Structural planes in the rock mass Digital drilling Drilling parameters Equivalent compressive strength Testing method
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Theoretical model and testing method for ball indentation based on the proportional superposition of energy in pure elasticity and pure plasticity 认领 引用 被引量：4
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作者 Shuqian SI Lixun CAI +2 位作者 Hui CHEN Chen BAO Xiaokun LIU 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2022年第2期141-153,共13页
For a homogeneous,continuous,and isotropic material whose constitutive relationships meets with the Ramberg-Osgood law(R-O law),the energy in the elastoplastic indentation with a ball indenter was theoretically analyz... For a homogeneous,continuous,and isotropic material whose constitutive relationships meets with the Ramberg-Osgood law(R-O law),the energy in the elastoplastic indentation with a ball indenter was theoretically analyzed,and the proportional superposition of energy in pure elasticity and pure plasticity during indentation was considered based on the equivalence of energy density.Subsequently,a Proportional Superposition-based Elasto Plastic Model(PS-EPM)was developed to describe the relationships between the displacement and the load during the ball indentation.Furthermore,a new test method of Ball Indentation based on Elastoplastic Proportional Superposition(BI-EPS)was developed to obtain the constitutive relationships of R-O law materials.The load–displacement curves predicted using the PS-EPM model were found to agree closely with the Finite Element Analysis(FEA)results.Moreover,the stress vs.strain curves predicted using the BI-EPS method were in better agreement with those obtained by FEA.Additionally,ball indentation was performed on eleven types of metal materials including five types of aluminum alloys and six types of steel.The test results showed that the stress vs.strain relationships and the tensile strength values predicted using the proposed BI-EPS method agreed well with the results obtained using conventional uniaxial tensile tests. 展开更多
关键词 Ball indentation Energy density Proportional superposition of elasticity and plasticity Stress vs.strain relationships Testing method Theoretical model
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A review of welding residual stress test methods 认领 引用 被引量：9
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作者 Gan Shiming Liu Huaying +1 位作者 Zhai Zhiping Han Yongquan 《China Welding》 CAS 2022年第2期45-55,共11页
Due to local uneven heating during the welding process,the residual stress of the structure after welding affects the reliability of it.In order to ensure the reliability,it is of great significance to test the residu... Due to local uneven heating during the welding process,the residual stress of the structure after welding affects the reliability of it.In order to ensure the reliability,it is of great significance to test the residual stress distribution of the welded joint.It has always been the focus to find a simple and feasible method for residual stress testing to quickly and accurately obtain the residual stress distribution of welded joints.The mechanical measurement method has high measurement accuracy,convenient and easy operation,but it will cause certain damage to the components.Physical measurement method can avoid damage to components,but its test cost is usually high,and its measurement accuracy can also be affected by the material microstructure characteristics of welded components.Based on the advantages and disadvantages of these two residual stress test methods,a modal test method is proposed.This method is a non-destructive measurement method.Based on the mathematical relationship between the residual stress of the welded structure and the natural frequency(mathematical model),the natural frequency is measured through the modal test to calculate the residual stress quickly.However,it is difficult to establish a mathematical model with this method,and it is not suitable for realization. 展开更多
关键词 welding residual stress mechanical measurement method physical measurement method modal test method
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A Review of Test Methods for the Determination of the Permeability Coefficient of Gravelly Soils Used for Embankment Dams 认领 引用 被引量：3
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作者 Zhenggang Zhan Han Chen +2 位作者 Yanyi Zhang Ruilin Cheng Gang Deng 《Fluid Dynamics & Materials Processing》 EI 2022年第1期131-144,共14页
The factors influencing the permeability coefficient of gravelly soils used for the development of embankment dams(core wall)are analyzed.Such factors include(but are not limited to)soil size,anisotropy,density and bo... The factors influencing the permeability coefficient of gravelly soils used for the development of embankment dams(core wall)are analyzed.Such factors include(but are not limited to)soil size,anisotropy,density and boundary effects.A review of the literature is conducted and new directions of research are proposed.In such a framework,it is shown that gravelly soil with controlled density and vertical stress should be used to optimize the measurement of the vertical and horizontal permeability coefficients,respectively. 展开更多
关键词 Wide-grading gravelly soil core wall materials permeability coefficient test method
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Effect of SACMA and QMW Test Methods on Compressive Properties of Composite Laminates after Low Velocity Impact 认领 引用 被引量：3
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作者 CHENG Xiao-quan ZHANG Zi-long +1 位作者 YI Xiao-su WU Xue-ren 《Chinese Journal of Aeronautics》 EI CAS 2002年第2期90-97,共8页
Experimental studies on the compressive behavior of composite laminates after low velocity impact was carried out with two test methods.One is SACMA Standard,and the other is a small dimensional specimen test method.I... Experimental studies on the compressive behavior of composite laminates after low velocity impact was carried out with two test methods.One is SACMA Standard,and the other is a small dimensional specimen test method.Impact damage distributions,compressive failure process after impact,quasi static indentation and compression of laminates with a hole were brought into comparison between these two test methods.The results showed that there is a great difference between these two test methods.Compressive behavior of laminates after impact varies with different test methods.Residual compressive strength of laminates after low velocity impact measured with SACMA Standard can reflect stiffness properties of composite resins more wholely than that measured with the other method can do.Small dimensional specimen test method should be improved on as an experimental standard of compressive strength after impact. 展开更多
关键词 composite laminates test methods low velocity impact damage residual compressive strength
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Application of the extended Fourier amplitude sensitivity testing(FAST)method to inflated,axial stretched,and residually stressed cylinders 认领 引用 被引量：2
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作者 H.ASGHARI H.TOPOL +1 位作者 B.MARKERT J.MERODIO 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI CSCD 2023年第12期2139-2162,共24页
This paper is dedicated to applying the Fourier amplitude sensitivity test(FAST)method to the problem of mixed extension and inflation of a circular cylindrical tube in the presence of residual stresses.The metafuncti... This paper is dedicated to applying the Fourier amplitude sensitivity test(FAST)method to the problem of mixed extension and inflation of a circular cylindrical tube in the presence of residual stresses.The metafunctions and the Ishigami function are considered in the sensitivity analysis(SA).The effects of the input variables on the output variables are investigated,and the most important parameters of the system under the applied pressure and axial force such as the axial stretch and the azimuthal stretch are determined. 展开更多
关键词 sensitivity analysis(SA) Fourier amplitude sensitivity test(FAST)method cylindrical inflation nonlinear elasticity
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Correlations between direct and indirect strength test methods 认领 引用 被引量：9
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作者 Kallu Raj Roghanchi Pedram 《International Journal of Mining Science and Technology》 EI CAS CSCD 2015年第3期355-360,共6页
The difficulties associated with performing direct compression strength tests on rocks lead to the development of indirect test methods for the rock strength assessment. Indirect test methods are simple, more economic... The difficulties associated with performing direct compression strength tests on rocks lead to the development of indirect test methods for the rock strength assessment. Indirect test methods are simple, more economical, less time-consuming, and easily adaptable to the field. The main aim of this study was to derive correlations between direct and indirect test methods for basalt and rhyolite rock types from Carlin trend deposits in Nevada. In the destructive methods, point load index, block punch index, and splitting tensile strength tests are performed. In the non-destructive methods, Schmidt hammer and ultrasonic pulse velocity tests are performed. Correlations between the direct and indirect compression strength tests are developed using linear and nonlinear regression analysis methods. The results show that the splitting tensile strength has the best correlation with the uniaxial compression strength.Furthermore, the Poisson's ratio has no correlation with any of the direct and indirect test results. 展开更多
关键词 Uniaxial compression strength test Indirect strength test methods Correlation Regression analysis
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Velocity plus displacement equivalent force control for real-time substructure testing 认领 引用 被引量：3
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作者 Zhou Huimeng D.Wagg Wang Tao 《Earthquake Engineering and Engineering Vibration》 SCIE EI CSCD 2018年第1期87-102,共16页
This paper employs a velocity plus displacement（V＋D）-based equivalent force control（EFC） method to solve the velocity/displacement difference equation in a real-time substructure test. This method uses type 2 fee... This paper employs a velocity plus displacement（V＋D）-based equivalent force control（EFC） method to solve the velocity/displacement difference equation in a real-time substructure test. This method uses type 2 feedback control loops to replace mathematical iteration to solve the nonlinear dynamic equation. A spectral radius analysis of the amplification matrix shows that the type 2 EFC-explicit, Newmark-β method has beneficial numerical characteristics for this method. Its stability limit of Ω = 2 remains unchanged regardless of the system damping because the velocity is achieved with very high accuracy during simulation. In contrast, the stability limits of the central difference method using direct velocity prediction and the EFC-average acceleration method with linear interpolation are shown to decrease with an increase in system damping. In fact, the EFC-average acceleration method is shown to change from unconditionally stable to conditionally stable. We also show that if an over-damped system with a damping ratio of 1.05 is considered, the stability limit is reduced to Ω =1.45. Finally, the results from an experiment with a single-degree-of-freedom structure installed with a magneto-rheological（MR） damper are presented. The results demonstrate that the proposed method is able to follow both displacement and velocity commands with moderate accuracy, resulting in improved test performance and accuracy for structures that are sensitive to both velocity and displacement inputs. Although the findings of the study are promising, additional test data and several further improvements will be required to draw general conclusions. 展开更多
关键词 real-time substructure test EFC velocity/displacement control newmark-β method stability
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Warm Compaction Process of P/M Steels by Orthogonal Testing Method 认领 引用
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作者 叶途明 YI Jianhong +2 位作者 PENG Yuandong XIA Qinglin WANG Hongzhong 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2008年第1期105-108,共4页
In order to achieve higher density of P/M steels using the die wall lubrication compacting method or powder lubricant in warm compaction process, the influence of different process parameters on the green density of w... In order to achieve higher density of P/M steels using the die wall lubrication compacting method or powder lubricant in warm compaction process, the influence of different process parameters on the green density of warm compacted samples was studied. According to the orthogonal test method, the authors systematically study the influence of the different compaction pressure, condition of lubrication and compaction temperature on the green density of the sample in the warm compaction process, and put forward the optimal process parameter of warm compaction experiment. It is found that, a high compaction pressure （≥700 MPa）, die wall lubrication combined with a small amount of internal lubricants, and fitting compaction temperature by different condition of lubrication, are the optimal parameters in warm compaction process. 展开更多
关键词 warm compaction orthogonal test method die wall lubrication particle rearrangement plastic deformation
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Discussion on pile axial load test methods and their applicability in cold regions 认领 引用
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作者 JiaWei Gao Ji Chen +2 位作者 Xin Hou QiHang Mei YongHeng Liu 《Research in Cold and Arid Regions》 CSCD 2022年第4期239-249,共11页
The measurement of pile axial load is of great significance to determining pile foundation design parameters such as skin friction and end bearing capacity and analyzing load transfer mechanisms.Affected by the temper... The measurement of pile axial load is of great significance to determining pile foundation design parameters such as skin friction and end bearing capacity and analyzing load transfer mechanisms.Affected by the temperature and ice content of frozen ground,the interface contact relationship between pile foundation and frozen soil is complicated,making pile axial load measurements more uncertain than that in non-frozen ground.Therefore,it is necessary to gain an in-depth understanding of the current pile axial load test methods.Four methods are systematically reviewed:vibrating wire sensors,strain gauges,sliding micrometers,and optical fiber strain sensors.At the same time,the applicability of the four test methods in frozen soil regions is discussed in detail.The first two methods are mature and commonly used.The sliding micrometer is only suitable for short-term measurement.While the Fiber Bragg grating(FBG)strain gauge meets the monitoring requirements,the Brillouin optical time-domain reflectometer(BOTDR)needs further verification.This paper aims to provide a technical reference for selecting and applying different methods in the pile axial load test for the stability study and bearing capacity assessment of pile foundations in cold regions. 展开更多
关键词 Pile axial load Test methods Pile shaft resistance Sensors Cold regions
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Lifespan Estimates of Solutions to the Tricomi Equation with Memory Terms 认领 引用
20
作者 YANG Jie YAO Jiangyan 《应用数学》 北大核心 2026年第2期605-623,共19页
The main purpose of this paper is to investigate the singularities of solutions to the single Tricomi equation with derivative term and combined memory term.In addition,the blow-up of the solution to the weakly couple... The main purpose of this paper is to investigate the singularities of solutions to the single Tricomi equation with derivative term and combined memory term.In addition,the blow-up of the solution to the weakly coupled system with memory term is also considered,where one is a power nonlinear term and the other is a derivative nonlinear term.Upper bound lifespan estimates of solution are obtained in the sub-critical by utilizing the test function method and iteration technique.The innovation of this paper focuses on the lifespan estimates of the solutions,which extends the well-known Strauss and Glassey conjectures. 展开更多
关键词 Tricomi equation Memory term Semilinear weakly coupled system Test function method Iteration method
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