沥青玛蹄脂碎石路面初期抗滑性能影响因素

SMA混合料具备优良的高温稳定性与耐久性能被广泛应用于重载交通道路,但是由于其沥青用量大、填料多的材料特征,导致施工难度高、早期抗滑水平偏低.为改善SMA路面早期抗滑性能,基于广东省高速公路SMA路面,开展施工环节的关键工艺研究,并系统分析主要因素对路面抗滑性能的影响.结果表明,对SMA沥青混合料的拌制、摊铺、碾压环节的施工温度和关键技术进行控制,可以保证混合料的施工质量,减少施工离析与温度离析.油石比、纤维用量对构造深度的影响最大,随着沥青油石比增加、纤维用量增大,构造深度明显变小;增加胶轮碾压会出现构造深度小幅下降,改变沥青种类对初期构造深度影响不大.使用颗粒状纤维、增加纤维用量、降低油石比有助于提高横向力系数,使用胶轮碾压工艺反而降低路面横向力系数,而沥青种类对初期横向力系数影响不大.     

无核密度测试技术在SMA-10磨耗层碾压质量的应用研究

SMA-10路面拥有良好的骨架嵌挤结构和足够的胶浆填充,具有优良的抗车辙、抗水损害、耐久性能,越来越多地应用于高速公路磨耗层和养护罩面层的铺筑。但在碾压环节容易出现过度碾压导致表面碎石被压碎,油膜脱落,不仅影响抗滑性能,甚至容易造成外界水分侵入导致路面水损害。为提高SMA-10沥青混合料的施工质量,以广东省粤西地区茂湛高速项目为依托,采用无核密度仪对碾压工艺开展试验研究。结果表明：影响SMA-10混合料压实度的主要因素包含压实组合、压实遍数和碾实温度,正常施工条件下碾压6遍（静压2.5遍+振动碾压3.5遍）即可达到规范要求的压实度,温度在下限状态下需适当增加振动碾压遍数;随着碾压遍数增加,压实度呈现先递增后平缓的规律,路表碎石棱角破损突出。建议对SMA-10路面施工,全面做好各阶段的温保措施,针对不同项目的SMA-10混合料的设计情况,采用无核密度仪获得压实曲线,作为SMA-10混合料精准碾压的控制手段。     

浅谈高速公路沥青混凝土路面压实质量控制

铺筑高质量的沥青路面要通过原材料的严格把关、严格的施工工艺控制来实现,沥青混合料的碾压是沥青路面施工工艺的最后一道程序,如果在碾压环节出现任何质量问题,造成压实度不够,必将前功尽弃,路面的耐久性必将受到影响.结合本人在近几年路面项目的施工管理经验,就沥青混合料路面压实谈谈看法.     

骨架密实型水泥稳定碎石基层施工关键技术研究

半刚性水稳基层是高等级路面结构的主要形式,具有优良承载力与工程经济效益.针对骨架密实型水泥稳定碎石结构施工过程的离析、难以碾压密实、钻芯完整性差的问题,以紫惠高速路面工程为依托,通过跟踪基层试验路段铺筑各个环节,开展骨架密实型水稳碎石的设计与施工关键技术研究.使用分级掺配法设计具有优良骨架与密实性的目标矿料级配,并基于振动成型法确认最佳水泥剂量下的混合料最大干密度与最佳含水率指标,最终通过不同时间下的抗压强度试验确定合理的施工窗口期.施工过程中,针对骨架型水稳混合料特性,对混合料搅拌、运输、摊铺、碾压、养生等环节的关键技术要点进行总结归纳.最后,重点研究不同碾压工艺对混合料压实度、芯样质量的影响.试验结果显示,提前使用胶轮进行搓揉碾压,有助于提高路面压实度与结构层的完整性,减少后期开放交通后产生的表层碎石过度跑散问题,同时增强水稳结构的抗冲刷性能.     

SMA沥青马蹄脂碎石路面施工工艺

目前，SMA路面在高等级路面中应用越来越多。在SMA施工过程中，其施工准备、混合料拌制、摊铺以及碾压是几项关键工作；沥青含量控制、油斑形成是SMA施工中极易出现的难点问题。现对这些施工关键控制要点进行归纳和总结，对难点问题进行了细致的分析。本文结合某高速公路工程实际并从SMA混合料配合比设计等角度系统研究分析了这种路面新型结构的路用性能。     

论述SMA沥青路面的施工质量控制要点

文章从混合料的拌和、摊铺、碾压几个方面探讨了SMA沥青混凝土路面的施工技术及质量控制要点,具有较强的现实指导价值。     

某工程现场沥青热再生混合料配合比设计

现场热再生技术是指就地加热旧路面,耙松、收集旧料,适当增加新拌的沥青混合料及再生剂进行热搅拌,随后摊铺、碾压、开放交通。现场热再生技术可以创造大量的经济效益及社会效益,并减少对环境的污染。沥青混凝土热再生技术的施工配合比设计是一个至关重要的环节,直接关系着沥青混凝土路面的使用寿命。文章设计了具体工程现场的沥青热再生混合料配合比。     

SMA在路面工程中的应用与质量控制

介绍了SMA路面的构成成分及其优点，并结合工程实践情况阐述了SMA的施工前准备、混合料拌合、运输、摊铺及碾压的施工工艺和质量控制要点。     

普通沥青路面施工中存在的问题不足及改进措施

传统的沥青混凝上施工工艺导致初始平整度低,沥青混凝土不均匀,混合料集料离析和温度离析大,沥青面层间粘接不能形成嵌锁,造成层间不连续,压实度低等现象导致路面产生破坏,缩短了使用寿命,采用新的设计理念、新的施工机械、新的施工工艺是可以大幅度提高路面质量和使用寿命的.     

GT TECH高性能沥青混凝土在钢桥面铺装施工关键技术研究

针对番禺区光明大桥所处的气候环境与交通荷载及钢桥面铺装的特殊要求,提出双层高性能沥青混凝土GT10铺装方案。为适应钢桥面的变形,对铺装材料并进行特殊的混合料配合比设计。结合桥面板喷砂除锈和防腐工艺、环氧树脂粘结层施工、沥青混合料拌合与运输、摊铺与碾压等环节关键技术控制,详细介绍番禺区光明大桥钢桥面铺装施工工艺,最终实现钢桥面铺装层结构的优良交验标准。     

Penetration and Post-infection Development of Meloidogyne Incognita on Tobacco as Treated by Rhizobacteria Pseudomonas Fluorescens Strain P-72-10

The bio-control potential of rhizospere bacteria Pseudomonas fluorescens against plant-parasite nematode had been demonstrated. P. fluorescens had shown the effect to enhance tobacco resistance to root-knot nematode Meloidogyne incognita. Inoculation with P. fluoreseens in tobacco could lead to significant reductions in the number of juveniles that penetrated tobacco root and further life stage development of the juveniles. The number of juveniles penetrated into tobac- co root in treatment with P. fluorescens is significantly different from CK at 2DAI, 6DAI, 8DAI and 10DAI. Significant reduction and delayed development of juveniles that penetrated into tobacco root and treated were observed in treatment at 14DAI, 21DAI, 28DAI and 35DAI. In addition, P. fluoreseens treatment leads to a significant reduction in the number of eggs per egg-mass at 35 DAI. The results show P. fluorescens induced a continuously suppression on root-knot nema- tode M. incognita throughout their entire early infection phase of root penetration, subsequent life stage development and reproduction.     

Taxing Times in Indonesia: The Challenge of Restoring Competitiveness and the Search for Fiscal Space

Indonesia’s economic growth picked up slightly in mid-2016 but remains below the level demanded by government and popular aspirations. Despite a plethora of reforms intended to increase efficiency and productivity, some policies are perverse and longstanding problems of implementation remain. The share of manufacturing has declined, the real exchange rate has appreciated, exports have dwindled, and growth has been trending downwards. The banking sector is stable but inefficient, with wide net interest margins and numerous barriers to competition. Trade protection, particularly in basic food commodities, has created high costs that weigh particularly heavily on the poor. Declining government revenues have placed increasing pressure on the public budget, even as the current administration aims to increase spending on infrastructure and welfare and to enhance productivity. In an effort to increase revenues, the government has announced a tax amnesty program and other measures. In addition, Sri Mulyani Indrawati, the new finance minister, has taken steps to cut non-essential expenditure in order to secure high spending on infrastructure and at the same time keep within the 3% budget deficit limit stipulated by law. Although the overall debt situation is not yet alarming, declining revenues and budget cuts that do not fully reflect this decline are putting pressure on increasing debt levels. The government’s high-profile tax amnesty program was the major policy initiative implemented in the second half of 2016 that aimed to relieve this pressure. Despite widespread criticism of, and scepticism about, the tax amnesty (both within and outside Indonesia), its first phase had a much higher participation rate than most independent accounts expected. Revenues raised so far through the amnesty are less than 60% of the official target, but this is actually a strong result for the short term. The bigger question, however, is whether the amnesty is a key element of a more encompassing strategy to overhaul the system of taxation and tax administration.     

利用膜技术回收利用碱性废水研究进展

回顾了利用膜分离技术处理碱性废水的工艺与综合利用技术所取得的丰硕成果，总结了各种治理方法的特点、适用性及发展方向。     

The causes of Japan's ‘lost decade’: The role of household consumption

In this paper, I analyze the causes of the prolonged slowdown of the Japanese economy in the 1990s and find that the stagnation of investment, especially private fixed investment, was the primary culprit. I then investigate the causes of the stagnation of household consumption during the 1990s and find that the stagnation of household disposable income, the decline in household wealth, and increased uncertainty about the future are among the contributing factors. Finally, I consider whether demand side factors or supply side factors were more important as causes of the prolonged slowdown of the Japanese economy in the 1990s and conclude that the former (especially misguided government policies) were probably more important.     

Stature growth in industrializing Argentina: The Buenos Aires industrial belt 1916-1950

A sustained long-term increase in average stature accompanied the process of import-substituting industrialization in the main suburban area of Argentina, the Buenos Aires Conurbano. This gain in net nutrition was attained before the rise to power of a re-distributionist political party: the Peronists. The article also provides evidence of a decline in average heights during the period 1939-1945, which challenges us to revise the traditional wisdom about the impact of World War II and Peronist social policies and its implications for the nutrition and health of children. The new evidence on heights shows also persistent social and regional differences over time that had not been documented before.     

The Transfer of Property Rights from the Public to the Private Sector in Hong Kong: A Critical Assessment

Abstract

The privatization idea may have lost some of its luster in recent years, but it remains relevant in today's socio-economic environment and is pursued consistently in industrialized and industrializing countries alike. Hong Kong has followed the general pattern in a manner reflecting its particular circumstances and its institutional modus operandi. The underlying logic may not appear highly compelling, from a short-term perspective, yet there are sound grounds for approaching the task positively, if viewed from a multi-year standpoint. Rather surprisingly, for such a quintessentially capitalist society, Hong Kong has not confronted the privatization challenge astutely on the political front and has handled it somewhat mechanically in managerial terms. The benefits to the community may have thus been more modest than one could legitimately expect, given the historical backdrop.     

Measuring performance: Ranking state success over two decades in India

This paper proposes new composite measures of relative and dynamic state performance to improve governance and delivery of public programs in developing countries with a federal structure. We illustrate the use of the indices to rank the performance of 19 major Indian states on two large development programs launched by the Indian government over the last two decades using publicly available data. Although we find volatility in performance over time, there exists a positive correlation between measures of initial (administrative) state capacity, development and accountability with program outcomes. Our findings have important implications for both the design and implementation of large-scale public programs across developing countries.     

Thinking regionally: Aviation and development implications in the Karoo region,South Africa

This study focuses on regional economic development in South Africa, across provincial political jurisdictions. The article argues that remote hinterlands can be more usefully understood as forming an integrated whole, rather than functioning as the poor rural cousins of their provincial metropoles. This article considers three propositions: that key transport projects (such as airports) may unlock regional development; that this may stimulate regional spatial integration; and that this may spur the South African government to address its weak regional planning system. All three propositions are speculative, drawn from the international literature, but they contribute to an argument for greater spatial coherence in South African planning in rural regions. The argument is illustrated with reference to the Karoo region of South Africa, and the potential of a new airport to impact on regional economic dynamics. Furthermore, the article argues that such impacts will require new regional planning systems, which are currently absent from the South African political system.