政府“触官”舆情回应弹性影响机制与调适策略

政府“触官”舆情是指由政府官员言行引发的舆情事件与舆论态度。政府“触官”舆情事件中政府回应速度与回应质量不匹配,会影响政府形象,降低政府公信力。政府“触官”舆情回应弹性受到内外部环境压力、舆情注意力分配、多元主体博弈、政府回应能力等多维度因素的影响。基于此,政府应通过借助内外双重环境压力、合理配置舆情注意力、完善主体博弈策略、提升舆情回应能力等调适“触官”舆情回应弹性。

研判、博弈与调适:“涉官”舆情政府回应弹性的影响因素及其作用机理

回应弹性指政府回应中回应速度和回应质量不同步、不协调、不稳定的现象。文章以自建“涉官舆情政府回应案例库”为基础,采用140个涉官舆情案例为样本,从4个维度16个指标出发对影响涉官舆情回应弹性的因素及其作用机理进行了实证研究。研究表明:回应弹性是政府对内外部影响因素进行研判、博弈和调适的结果。政务公开、央媒报道等因素对回应速度的提升高于对质量的改善;政府问责、舆情叠加、司法介入等因素对质量的改善高于对速度的提升。社会化媒体、利益型和激烈性诉求目标、新兴网络首发平台、涉党政机关、上级介入等因素能够同步提升政府回应的速度和质量。公众线下参与、政府话语回应、网络渠道回应等因素虽能提升回应速度但无助于提高回应质量。网络普及、政府能力等客观条件对回应成效的影响不明显,政府的主观意愿才是决定回应弹性的关键因素。

Thermal-mechanical and springback behavior of dual-phase steel at warm temperatures

For non-quenchable dual-phase(DP)steel sheet,the warm forming process can effectively reduce the amount of springback,and the mechanical parameters that influence its elastic and inelastic recovery to decrease exhibit a strong temperature dependence,especially under cyclic loading conditions.In this paper,the monotonic and cyclic loading tests of DP980 steel sheets are conducted at the temperatures ranging from 25℃ to 500℃.The temperature-dependent flow stress,nonlinear elastic recovery,and Bauschinger effect are investigated.The results demonstrate that both the elastic modulus and Bauschinger effect show an exponential law with pre-strain,and decrease with the increase of forming temperature,while there will be an abnormal phenomenon of rebound due to the influence of dynamic strain aging effect.Meanwhile,a linear relationship between the Bauschinger effect and inelastic strain is observed at various temperatures,and the weight of the Bauschinger effect in the total strain reduces with temperature increasing,which indicates that the springback is dominated by linear elastic recovery.Furthermore,the U-draw bending tests are carried out to clarify the influence of Vickers hardness distribution and martensite size effect on the springback behavior.

Dynamic Theory of Die Swell for Entangled Polymeric Liquids in Tube Extrusion： Correlations of Total and Ultimate Extrudate Swell Effects to Growth Time, Shear Stress and Aspect Ratio Under the Free States

The dynamic theory of die swell deduced in a previous paper was extensively applied to study the extrudate swelling behaviors of two entangled polymeric liquids （HDPE and PBD） in a simple shear flow at steady shear stress. The mechanism and dynamics for the recoils and the recoveries of viscoelastic strains in the extrudate were investigated under the free recovery and dynamic states. It was found that in the course of recovery the free recoil and the growth of die swell in the extrudate may be divided into two recovery regions （instantaneous and delayed regions） and three growth stages （instantaneous, delayed, and ultimate extrudate swelling stages）. The free recoil and the extrudate swelling behaviors may be expressed as a function of shear stress. The correlations of instantaneous, delayed, total and ultimate extrudate swell effects to the molecular parameters and the operational variables in the simple shear flow at steady shear stress were derived from the dynamic theory of die swell. Also, two sets of new universal equations on the total extrudate swelling effect （TESE） and ultimate extrudate swelling effect （UESE） were deduced. The first is the universal equation of the logarithmic correlation between the TESE and the growth time under the free and dynamic states; the second is the universal equation of the logarithmic correlation between the UESE and the operational variables under the free and equilibrium states. The first equation was verified by experimental data of PBD with different molecular weights at different operational variables. The second equation was verified by experimental data of HDPE at two temperatures and different operational variables. An excellent agreement result was obtained. The excellent agreement shows that the two universal equations can be used directly to predict the correlations of the TESE and UESE to the growth time, the molecular parameters, and the operational variables under the dynamic and equilibrium states.

Springback equation of small curvature plane bending

A new analytical method for springback of small curvature plane bending is addressed with unloading rule of classical elastic-plastic theory and principle of strain superposition.We start from strain analysis of plane bending which has initial curvature,and the theoretic derivation is on the widely applicable basic hypotheses.The results are unified to geometry constraint equations and springback equation of plane bending,which can be evolved to straight beam plane bending and pure bending.The expanding and setting round process is one of the situations of plane bending,which is a bend-stretching process of plane curved beam.In the present study,springback equation of plane bending is used to analyze the expanding and setting round process,and the results agree with the experimental data.With a reasonable prediction accuracy,this new analytical method for springback of plane bending can meet the needs of applications in engineering.