我国民族地区政策性农业担保支农效率评价

自我国政策性农业担保体系组建以来,有效实现了财政资金支农政策的延伸。当前乡村振兴背景下,实现政策性农业担保高质量发展,对提高农业担保支农效率具有重要作用。基于三阶段DEA模型,以2020年政策性农业担保数据为基础,对民族地区政策性农业担保支农效率进行评价。结果表明:(1)民族地区政策性农业担保支农效率整体水平偏低,各省政策性农业担保支农效率差异显著。(2)环境因素和随机扰动因素对民族地区政策性农业担保支农效率影响明显。经济发展水平对政策性农业担保支农效率有明显的增强作用,农业受灾情况对政策性农业担保支农效率具有明显的削弱作用,农业科技水平则有利于政策性农业担保技术转化效率提升。提出持续扩大政策性农业担保投入规模、不断提升政策性农业担保资金使用效率的对策建议。

基于FBCREAM方法的飞机驾驶人因可靠性评估模型

飞机驾驶人为差错是导致飞行不安全事件/事故的重要因素之一,为有效预测飞机驾驶人因可靠性,减少人为差错,确保飞行安全,提出一种基于FBCREAM(fuzzy Bayesian cognitive reliability and error analysis method)的飞机驾驶人因可靠性评估模型。考虑飞机驾驶的情境环境及人因特征,调整原始CREAM(cognitive reliability and error analysis method)中的人为差错形成条件使其更合理地表征驾驶舱中飞行员工作情境。引入模糊逻辑方法,利用隶属函数对人为差错形成条件的不确定性和模糊性进行建模。以人为差错形成条件的隶属度为输入参数,人为差错模式隶属度为输出构建贝叶斯网络模型,通过解模糊化方法计算人为差错概率精确值。选取单发故障情境环境下执行飞行任务进行实例分析,结果表明该方法能够准确评估飞机故障情境环境下的飞机驾驶人因可靠性,可为航空安全评估提供有效的工具和重要支持。

民族省区绿色低碳循环经济体系建设——基于青海省四地两体系发展定位的分析框架

建立和完善绿色低碳循环发展经济体系是促进我国经济社会全面绿色转型,解决资源、环境和生态问题的基本方针。研究表明,在绿色发展理念下,绿色低碳循环经济体系对环境和产业政策以及二者之间关系的调整,涉及经济发展方式、技术水平和制度体系的深层次变革。如何打造绿色低碳循环经济体系是青海省生态文明战略的核心议题,本文从青海省四地两体系发展定位出发,深刻剖析绿色低碳循环经济体系理论基础和运行机理,解析青海省四地两体系建设和生态文明战略实践中的制约因素。四地两体系建设迫切需要摆脱环境治理手段与传统产业政策的政策组合,注重市场机制的作用,建设和完善青海省绿色低碳循环经济体系的关键是促进四地两体系建设与市场机制以及产业和环境政策的协调,注重政策工具之间的协调互补,形成与市场机制相结合的新发展路径。

运行符合性评审的适航符合性方法研究

研究CAAC相关适航规章和条款,给出运行符合性适航要求。在适航符合性要求和验证方法的基础上,结合AEG工作特点,提出运行符合性评审内容正确性验证方法 MV1、MV2、MV3、MV6、MV7和MV8。基于运行符合性AEG工作方法及流程,结合飞机运行符合性清单编制应用特点,给出通用化的运行符合性清单的编制、填写和应用要求,为我国飞机运行符合性评审工作的通过和完善提供技术支持。

源头视域下青海省“黄河战略”方位与路径

新发展阶段,黄河流域生态保护和高质量发展在推动区域协调发展,助力共同富裕实现作用越发重要。青海省作为黄河源头省份,立足源头实际,理清深度融入“黄河战略”的定位、协调机理和框架,从生态保护、高质量发展以及二者耦合协调方面分析深度融入“黄河战略”的现实条件至关重要。研究发现青海省深度融入“黄河战略”存在生态保护权责矛盾突出、产业结构升级缓慢、要素集聚能力不强和参与区域合作程度低等问题。提出了青海省深度融入“黄河战略”具体路径,包括发挥兰西城市群的辐射带动作用,增强重点产业承接平台集聚优势,打造跨区域新兴产业链集群,促进创新链与产业链紧密对接,构建有利于产业转移的体制机制。

High Temperature Spectrum for v3 Band of Carbon Dioxide

The total internal partition sums （TIPS） are calculated at the temperature up to 6000 K for 12 C16 02. Using the calculated partition functions, we produce the line intensities of v3 band of 12C1602 at several high temperatures. The results show that the calculated line intensities are in very good agreement with those of HITRAN database at the temperature up to 3000 K, which provides a strong support for the calculations of TIPS and line intensities at high temperature. Then the calculation is extended to further high temperature, and the simulated spectra of u3 band of 12C1602 at 5000 and 6000 K are reported.

Sparse constrained encoding multi-source full waveform inversion method based on K-SVD dictionary learning

Full waveform inversion(FWI)is an extremely important velocity-model-building method.However,it involves a large amount of calculation,which hindsers its practical application.The multi-source technology can reduce the number of forward modeling shots during the inversion process,thereby improving the efficiency.However,it introduces crossnoise problems.In this paper,we propose a sparse constrained encoding multi-source FWI method based on K-SVD dictionary learning.The phase encoding technology is introduced to reduce crosstalk noise,whereas the K-SVD dictionary learning method is used to obtain the basis of the transformation according to the characteristics of the inversion results.The multiscale inversion method is adopted to further enhance the stability of FWI.Finally,the synthetic subsag model and the Marmousi model are set to test the effectiveness of the newly proposed method.Analysis of the results suggest the following:(1)The new method can effectively reduce the computational complexity of FWI while ensuring inversion accuracy and stability;(2)The proposed method can be combined with the time-domain multi-scale FWI strategy flexibly to further avoid the local minimum and to improve the stability of inversion,which is of significant importance for the inversion of the complex model.

Study on High-Temperature Spectra of Asymptotic Asymmetric-Top Molecule O_3

The line intensities of 001-000 transition of the asymptotic asymmetric-top Oa molecule at several temperatures are calculated by directly calculating the partition functions and regarding the rotationless transition dipole moment squared as a constant. The calculated values of the total internM partition sums （TIPS） are consistent with the data of HITRAN database with -0.61% at 296 K. The calculated line intensity data at 500 K and 3000 K are also in excellent agreement with the data in HITRAN database with less than 0.659% and 5.458% at 500 K and 3000 K, which provide a strong support for the calculations of partition function and fine intensity at high temperature. Then we extend the calculation to higher temperatures. The line intensities and simulated spectra of v3 band of the asymptotic asymmetric-top O3 molecule at 4000 and 5000 K are reported. The results are of significance for the studying of the molecular high-temperature spectrum including experimental measurements and theoretical calculations.

Elastic Constants of Superconducting MgB2 from Molecular Dynamics Simulations with Shell Model

The elastic constants of superconducting MgB2 are calculated using a molecular dynamics method (MD)with shell model. The lattice parameters, five independent elastic constants, equations of state (EOS), Debye temperature, and bulk modulus of MgB2 are obtained. Meanwhile, the dependence of the bulk modulus B, the lattice parameters a and c, and the unit cell volume V on the applied pressure are presented. It is demonstrated that the method introduced here can well reproduce the experimental results with a reasonable accuracy.

Pure q P-wave least-squares reverse time migration invertically transverse isotropic media and its application to field data

The anisotropic properties of subsurface media cause waveform distortions in seismic wave propagation,resulting in a negative infl uence on seismic imaging.In addition,wavefields simulated by the conventional coupled pseudo-acoustic equation are not only aff ected by SV-wave artifacts but are also limited by anisotropic parameters.We propose a least-squares reverse time migration(LSRTM)method based on the pure q P-wave equation in vertically transverse isotropic media.A fi nite diff erence and fast Fourier transform method,which can improve the effi ciency of the numerical simulation compared to a pseudo-spectral method,is used to solve the pure q P-wave equation.We derive the corresponding demigration operator,migration operator,and gradient updating formula to implement the LSRTM.Numerical tests on the Hess model and field data confirm that the proposed method has a good correction eff ect for the travel time deviation caused by underground anisotropic media.Further,it signifi cantly suppresses the migration noise,balances the imaging amplitude,and improves the imaging resolution.