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61.
结合工程实例,对跨高速铁路施工防护棚架的设计和施工方案进行了研究,并对荷载、防护支架结构、防护支架拆除后钢管立柱的稳定性作了计算分析,证明了该防护棚架设计的合理性。 相似文献
62.
由于工艺布置和建筑造型的需要,供热站主厂房设计变得相当复杂与繁琐,文中通过工程实例对其进行分析,表明工艺之间相互配合、在充分利用平面和竖向空间基础上、能够达到工艺顺畅和结构抗震性能良好的统一。 相似文献
63.
《Journal of Nuclear Science and Technology》2013,50(12):934-942
Distribution coefficients K ds of several radionuclides on suspended particulate matter (SPM) have been determined with laboratory batch experiments using samples collected in the Kinki district, Japan. Most SPM in coastal water was retained on the initial filter of four sequential filtering stages (20, 5, 1 and 0.45 μm pore size), maximum K d also being found for the SPM retained in this first stage. When the filtrations were not performed in series, however, but were conducted from the same tracer solution in parallel, the K d values were identical for the smaller filter sizes (5, 1 and 0.45 μm) and were greater, by ca. 150% than those derived from the 20 μm filter. The degree of association of the radionuclides with SPM was 85Sr<137Cs<65Zn<54Mn<60Co. The particulate radioactivity fraction of the SPM in coastal water was estimated at most 0.1 for radionuclides with K d of ca. 5 X 104 ml/g, i.e. which are highly associated with the SPM (2 mg/l). The scavenging effect by SPM seemed to be, however, considerable, the settling velocity being estimated at ca. 25 cm/day for particles of the Stoke's diameter of 30 μm. 相似文献
64.
《ISA transactions》2014,53(6):1892-1900
Two-dimensional gyroscopic torque can be produced by tilting the rotor shaft of the active magnetically suspended momentum wheel. The nonlinear magnetic torque is analyzed and then an adaptive back-stepping tracking method is proposed to deal with the nonlinearity and uncertainty. The nonlinearity of magnetic torque is represented as bounded unknown uncertainty stiffness, and an adaptive law is proposed to estimate the stiffness. Combined with back-stepping method, the proposed method can deal with the uncertainty. This method is designed by Lyapunov stability theory to ensure the stability, and its effectiveness is validated by simulations and experiments. These results indicate that this method can realize higher tracking precision and faster tracking velocity than the conventional cross feedback method to provide high precision and wide bandwidth outputting torque. 相似文献
65.
根据上海市竹园第一污水处理厂的运行数据,研究了该厂的污泥产率。结果表明竹园第一污水处理厂每万吨水产泥率的变化范围为0.38—1.44tSS/万M2;剩余污泥的表观产率系数(Lobs)和合成产率系数(y)分别为0.56和0.58kgVSS/kgBOD,均在正常范围以内;衰减系数(虬)为0.006d-1;惰性ss产泥率的变化范围为0.20~0.50tSS/万M2。 相似文献
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Branko Kolarevic 《Architectural Design》2015,85(5):128-133
An emphasis on material synthesis is not without its pitfalls and challenges. Here Branko Kolarevic , Professor and Chair in Integrated Design at the University of Calgary Faculty of Environmental Design, alerts us to the dangers of overlooking materials' shifting capacities, which are so often scale dependent, while also disregarding existing materials in favour of the new or novel. As the potential grows for material systems in buildings to become more adaptive and to harness automation, Kolarevic describes some exciting developments that are taking place in dynamic facade design, providing the much-heralded promise of an efficient use of ambient energy. 相似文献
70.
《Structure and Infrastructure Engineering》2013,9(2):129-144
Since the 1970s, many researchers have attempted to use changes in natural frequencies as means for condition assessment of large civil engineering structures such as bridges, but have faced the challenge of decoupling frequency variations apparently caused by changing operational conditions. In the case of the Tamar Bridge in southwest England, the time series of natural frequencies exhibit diurnal variations resulting from a combination of thermal and vehicular loading, the effects of which would need to be compensated for in dynamics-based assessment. By examining monitored data for several years, the effects of traffic mass have been characterised and compared with other operational effects. While temperature changes appear to have a greater influence for lateral modes, traffic mass is a strong factor in all modes and the dominant factor for the vertical and torsional modes evaluated. Physics-based explanations for the variable effects of vehicle mass have been sought using a finite element model calibrated against experimental data. As a caution for performance prediction in structural dynamics, while acceptable reconciliation of natural frequencies from FE model and measurements was achievable, reconciling simulated effects of changing mass with observed behaviour has not been straightforward due to the complexity of the retrofitted suspension bridge structure studied. 相似文献