RAP在排水沥青混凝土中的应用研究

采用 RAP 取代部分天然砂石,添加矿物纤维及矿粉等进行配合设计试验,评估再生沥青排水路面各项工程性质。据试验结果,添加30%RAP,工程性质可满足规范要求。故排水路面适量添加RAP,在适当的范围内满足了规范要求。     

吉林省沥青路面老化病害分析及配合比设计方法研究

本文针对沥青路面运营过程中,在行车荷载和自然条件的综合作用下,路面出现老化,降低了路用性能及公路的服务水平的现状,调查并分析了老化所产生的病害及对于公路运营的影响.同时,在现有再生技术的基础上,提出了适合吉林省高速公路建设的旧沥青混合再生技术研究路线.     

SBS改性沥青厂拌热再生混合料力学性能分析

针对SBS改性沥青厂拌热再生混合料,通过测量不同RAP用量及旧料加热温度下的抗压强度、劈裂强度,对再生混合料的力学性能变化规律进行了分析.试验结果表明：RAP含量在20%以内时,再生混合料性能与新料性能并无明显差别;随着RAP比例增加,再生混合料强度逐渐提高.当温度条件满足要求时,可以适当提高RAP用量.     

Mechanical ventilation and thoracic artificial lung assistance during mechanical circulatory support with PUCA pump: In silico study

Patients assisted with left ventricular assist device (LVAD) may require prolonged mechanical ventilatory assistance secondary to postoperative respiratory failure. The goal of this work is the study of the interdependent effects LVAD like pulsatile catheter (PUCA) pump and mechanical ventilatory support or thoracic artificial lung (TAL), by the hemodynamic point of view, using a numerical simulator of the human cardiovascular system. In the simulator, different circulatory sections are described using lumped parameter models. Lumped parameter models have been designed to describe the hydrodynamic behavior of both PUCA pump and thoracic artificial lung. Ventricular behavior atrial and septum functions were reproduced using variable elastance model. Starting from simulated pathological conditions we studied the effects produced on some hemodynamic variables by simultaneous PUCA pump, thoracic artificial lung or mechanical ventilation assistance. Thoracic artificial lung was applied in parallel or in hybrid mode. The effects of mechanical ventilation have been simulated by changing mean intrathoracic pressure value from −4 mmHg to +5 mmHg. The hemodynamic variables observed during the simulations, in different assisted conditions, were: left and right ventricular end systolic (diastolic) volume, systolic/diastolic aortic pressure, mean pulmonary arterial pressure, left and right mean atrial pressure, mean systemic venous pressure and the total blood flow. Results show that the application of PUCA (without mechanical ventilatory assistance) increases the total blood flow, reduces the left ventricular end systolic volume and increases the diastolic aortic pressure. Parallel TAL assistance increases the right ventricular end diastolic (systolic) volume reduction both when PUCA is switched “ON” and both when PUCA is switched “OFF”. By switching “OFF” the PUCA pump, it seems that parallel thoracic artificial lung assistance produces a greater cardiac output (respect to hybrid TAL assistance).     

综合法设计厂拌热再生沥青混合料配合比探讨

文章根据连霍高速公路郑州段某标段的铣刨旧料实际情况,介绍采用综合法进行了热再生沥青混合料配合比设计思路、重点步骤和试验过程,考察再生沥青以及再生沥青与新沥青混合后的的基本性能和抗老化性能;试验证明,在合适的旧料掺配比例范围内再生沥青混合料路用性能可以达到新热拌沥青混合料的指标要求。     

Effects of display format and colour coding schemes on visual monitoring performance using spatially and temporally distributed visual displays

The present study examined factors that decreased task complexity so that a technology which temporally, rather than spatially, distributed information (i.e. RAP COM, for rapid communication) would result in performace advantages. This was accomplished by physically integrating the stimulus information into either the display format (i.e. an analog format) or into the response coding scheme (i.e. a colour coding scheme). Performance using the RAP COM display indicated a lower proportion of errors for the analog than for the digital format; however, a longer mean response time for a correct response was found for the analog than for the digital format. Two colour coding response schemes were used: (a)_a continuous scheme that comparised gradual changes between red and blue; (b) a distinctive scheme consisting of the colours cyan, green, yellow, orange, red, mauve, purple and blue. When the continuous colour coding responses scheme was used, performance using the RAP COM display, as compared with the spatial display, was no different after extended practice. The results of these experiments taken together indicate that the RAP COM display type may be a viable technology for some limited ‘real world’ environments.     

ABB机器人应用协议的研究

介绍了ABB公司的机器人应用协议RAP,该协议提供了一个ABBS4系列机器人控制器的应用接口,利用协议中的服务可以和机器人通讯得到机器人的各项参数。详细阐述了基于远程过程调用RPC的RAP协议规范以及如何用XDR语言进行RAP协议的编写、编译。探讨了机器人通讯模块的设计方法,以及RAP协议的网络体系结构与服务。最后,对RAP的应用进行了展望,提出了机器人实时监控的构想。     

厂拌热再生旧料中沥青回收方法优化分析

回收沥青路面或沥青混合料(RAP)中老化沥青是评定路面沥青老化程度的关键。现行标准《JTG E20—2011公路工程沥青及沥青混合料试验规程》中规定的沥青抽提回收方法存在不足。主要介绍了从不同真空度、离心速度角度用旋转蒸发器法回收RAP料中的老化沥青,并分析老化沥青性能,提出了老化沥青抽提回收的适合真空度和离心速度,以实现老化沥青性能的准确评价,指导厂拌热再生混合料的应用。     

旧料掺量对乳化沥青冷再生混合料路用性能的影响

为得到乳化沥青冷再生混合料中旧料的最佳掺量,现通过室内试验研究乳化沥青混合料中旧料(RAP)掺量对其力学性能和路用性能的影响。结果表明:RAP掺量为45%时的无侧限抗压强度最大值3.22 MPa;劈裂强度达到最大值0.66 MPa;混合料的高温稳定性及低温抗裂性会随着RAP的增多而降低,当RAP掺量为45%时混合料的动稳定度和弯曲应变最大,分别为3 792次/mm、2 914με;随着RAP掺量增大,混合料的水稳定性逐渐降低,当RAP掺量为75%时,其残留稳定度为78.75%,低于规范值;混合料的抗疲劳性随RAP掺量增加呈现先增大后减小的趋势,当RAP掺量为55%时,混合料的抗疲劳性最好,应力比为0.7时疲劳寿命值达到18 608次。通过工程实例分析得出,RAP掺量为45%时,其弯沉值、压实度、抗压强度与劈裂强度均满足要求,并总结出施工质量控制措施。