对"大跃进"时期江苏省农业中学的宏观历史考察

1958年,农业中学最先诞生于江苏省.在"大跃进"运动的影响下,江苏省农业中学的学校数量及在校人数迅速膨胀,成为全国教育"大跃进"的一个重要组成部分和表现形式.在整个"大跃进"时期,江苏省的农业中学始终保持了一个庞大的规模,直到中共中央决定对国民经济实行"调整、巩固、充实、提高",其盲目发展的势头才得以遏制并开始逐步调整.     

20世纪60年代初国家财政支援农业的历史考察

由于"左"的错误和自然灾害,中国在1959～1961年出现了三年经济困难,当时最突出的问题是农业生产遭遇严重挫折,粮食极度短缺。为加快农业生产的恢复,20世纪60年代初,国家制定了"吃饭第一"的方针,要求各行各业支援农业。利用财政手段增加对农业的投入是贯彻这一方针的重要举措。国家财政支援农业的措施主要有两方面:一是减少提取农业剩余;二是直接增加对农业和农村的财政投入。     

"大跃进"时期扫除文盲运动述评

1958～1960年,是新中国历史上的"大跃进"时期.在各行各业"大跃进"的带动下,全国也很快地掀起了扫除文盲的"跃进"运动.这一运动随形势发展,由兴到衰,经历了一个曲折的发展过程.在扫除文盲运动中,存在着严重的浮夸现象,但一些具体的做法也不无借鉴意义.     

大跃进时期基层干群冲突及司法介入研究--以肥西县“方世新案”为中心

"方世新案"是大跃进与人民公社化时期安徽省肥西县发生的比较典型的因干群矛盾与冲突升级而导致的"凶杀"案。该案最终被定性为反党、反社会主义的反革命案件。官方处理此类案件,审判程序极为简化,即根据《中华人民共和国惩治反革命条例》作出判决。就审判过程而言,加强党的集中领导与管控、贯彻群众路线及考虑案犯罪恶的历史与现行关系,是大跃进与人民公社化时期中共最为重要的司法实践逻辑。这种逻辑也对应体现了这个时期司法发展历程的3个面向,即:司法政党化、司法群众化及司法革命化。但这3个方面的实践,最终将难免矮化司法的独立性、专属性及程序化,即会产生"秩序",也会导致"失序"。该项研究为探访大跃进时期基层干群冲突及司法介入问题提供一个基层个案与视角。     

Inelastic Demand Spectra of Bi-Linear Models for Capacity Spectrum Method and Response of Simple Structures under Near-Source Records

A very useful tool for the preliminary design of structures is the elastic demand spectrum that can be used in the capacity spectrum method. A pseudo-acceleration relationship has to be assumed when constructing a demand spectrum. This assumption results in large errors for long period structures with large damping ratios and the conventional demand spectra require a substitute elastic structure. In the present study, the conventional demand spectra are extended to bi-linear models. Pseudo-acceleration is still assumed but results in acceptably small errors, when a constant viscous damping coefficient for a single-degree-of-freedom (SDF) structure is calculated from the tangent stiffness and the damping ratio is set at 5% in both elastic and yield phases. For nonlinear structures, tangent stiffness dependency of damping force could be acceptable because energy absorption is primarily the result of structural nonlinear deformation. To extend the conventional demand spectra to a bi-linear model, effective period calculated from the secant stiffness has to be used. The use of effective period introduces no approximation because the peak displacement of the SDF structure is computed from nonlinear analysis in the time domain. The method presented in this study is also valid if damping coefficient proportional to initial elastic spectra is used. In this case, the pseudo-acceleration is defined as the base shear coefficient that is required to produce the peak displacement of the SDF structure in a static manner. We present demand spectra of bi-linear models for a number of near-source records from large earthquakes, and spectral ratios of two horizontal components. The effects of different types of ground motion on the response reduction factor due to inelastic deformation are investigated.     

Rocking Soil-Structure Systems Subjected to Near-Fault Pulses

Seismic performance of rocking soil-structure systems subjected to near-fault pulses is investigated considering foundation uplifting and soil plasticity. An extensive parametric study is conducted including medium-to-high-rise buildings with different aspect ratios based on shallow raft foundation at stiff-to-rock sites. Mathematical directivity and fling pulses are used as input ground motion. The superstructure is assumed to have three different boundary conditions: (a) fixed-base, (b) linear soil-structure interaction (SSI), and (c) nonlinear SSI. Evidently, the prevailing pulse period T_p is a key parameter governing nonlinear SSI effects. The normalized acceleration response spectra reveal that despite beneficial effects of foundation uplifting and soil yielding in most cases, there are some minor regions in which the response accelerations are amplified. In addition, more slender buildings significantly benefit from uplifting and soil yielding when subjected to short- and medium-period directivity pulses compared to squat structures. However, response amplifications with respect to fixed-base structures are considerable in case of slender structures subjected to medium- or long-period directivity pulses. So that neglecting the SSI effects on seismic performance of rocking structures with shallow foundations, as mostly assumed in common practice, may give rise to inaccurate estimations of force demands against near-fault pulselike ground motions. Furthermore, the envelope of residual foundation tilting θ_r is limited to 0.015 rad, in case of directivity pulses.     

河北省大办农村公共食堂的历史考察

1958年上半年至1961年6月,河北省农村公共食堂经历了一哄而起、难以为继、强行恢复、彻底终结的曲折发展历程,其命运与大跃进和人民公社化运动息息相关。伴随着大跃进和人民公社化运动的迅猛发展,农村公共食堂在河北省蓬勃兴起;随着大跃进的中止,河北省农村公共食堂也以失败告终。     

‘A Tiny Little Footnote in History’: Conservative Centre Forward

In May 1985, two years after he had returned to the back benches, Francis Pym launched the first organised display of dissent within the parliamentary Conservative Party against Margaret Thatcher's leadership: Conservative Centre Forward. Those Conservative MPs who joined the group were very much believers in One Nation Conservatism. Conservative Centre Forward survived for barely a week after going public; it rapidly collapsed amid accusations of disloyalty and inept leadership. The group proved to be a short-lived experiment which achieved little of note and exposed those who were involved to widespread ridicule. Yet, it was precisely because Conservative Centre Forward collapsed so quickly and achieved so little that it was significant. In its own way, the short life of the group provided a revealing commentary upon the character of the mid-1980s Conservative Party. It was a party which, on the one hand, was moving inexorably to the right and therefore ever further away from the values of One Nation Conservatism which Conservative Centre Forward espoused. On the other hand, it was a party which was still traditional enough to view open displays of dissent, of whatever magnitude, as a threat to the unity upon which its continued electoral success depended.     

PSHA for Broad-Band Strong Ground-Motion Hazards in the Saronikos Gulf,Greece, from Potential Earthquake with Synthetic Ground Motions

We perform a probabilistic seismic hazard analysis (PSHA) for broad-band strong ground motion within the Saronikos Gulf region, Greece, from potential earthquakes along the 30 km long Aigina fault in the northern part of the Gulf. We perform the PSHA utilizing empirical Green’s functions (EGFs) merged with synthetic Green’s functions (SGFs) along with models of finite rupture in place of standard “attenuation relations.” Our approach considers all significant magnitudes for PSHA and full broadband ground motion simulations. Calculations are source and site specific, and could reduce uncertainties in estimating standard engineering parameters. We use a range of rupture scenarios for all significant magnitude earthquakes along the fault. The hazard calculation is for frequencies 0.0– 15.0 Hz. Recordings of small earthquakes from an onshore/offshore local seismic array were used as EGFs for frequencies of 1.5–15.0 Hz, the finite difference code E3D was utilized to synthesize SGFs for frequencies 0.0–1.5 Hz, and an algorithm for merging the EGFs with SGFs was developed. The full-waveform calculations are important for non-linear dynamic analysis of structures in the coastal zone and potential hazard to long period structures. Results of proposed PSHA identify 2%, 10%, and 50% hazard at the selected sites of Saronikos Gulf.

Finally, we compare our PSHA results to those obtained by standard practice which involves prediction equations (GMPEs) recently developed in the Next Generation Attenuation (NGA) project and empirical predictive attenuation relations proposed for Greece. We believe that differences with the NGA results are due to site- and source-specific information utilized in this study, and incorporation of this information may significantly reduce the uncertainty in seismic hazard calculations.     

Constant Ductility Energy Factors for the Near-Fault Pulse-Like Ground Motions

This study is focused on the constant ductility energy factors for bilinear system under the near-fault pulse-like ground motions. The variation of energy factors is studied in consideration of the earthquake magnitude, rupture distance, damping ratios, and post-yield stiffness ratios. The results indicate that the near-fault pulse-like ground motions would increase the energy dissipation of structures. The energy factors are significantly influenced by the earthquake magnitude. The damping ratios have more obvious influences on the energy factors than the post-yield stiffness ratios. A predictive model is proposed for the application of constant ductility energy factors for near-fault pulse-like ground motions.