柠檬酸凝胶-助熔剂法制备片状氧化铝的工艺研究

文章以柠檬酸凝胶-助熔剂法制备片状氧化铝,采用XRD,SEM等分析手段,探讨了不同铝盐、不同助熔剂比例、不同煅烧温度、不同保温时间对片状氧化铝物相结构和形貌的影响。结果表明:以硫酸铝为铝盐、K_2SO_4助熔剂:铝盐物质的量比=2∶1、1 150℃下煅烧3 h,所得片状氧化铝形貌最佳。同时发现,随着助熔剂与铝盐物质的量比的不同,可依次获得花状、球状等自组装形貌,且不同自组装形貌,其氧化铝(104)(113)晶面衍射峰相对强度明显不同。     

HPLC-ELSD法测定花丹安神合剂中N-甲基-反式-4-羟基-L-脯氨酸的含量

文章建立花丹安神合剂中N-甲基-反式-4-羟基-L-脯氨酸的含量测定方法。方法:应用高效液相色谱法测定,色谱柱为YMC-Pack Polyamine II色谱柱(4.6 mm×250 mm,5μm);流动相为75%乙腈;流速为1.0 mL/min;柱温为30℃;检测器为ELSD检测器(漂移管温度48℃,气体流量1.8 L/min,增益1)。结果:N-甲基-反式-4-羟基-L-脯氨酸在5～20μg范围内峰面积与浓度呈良好的线性;加样回收率为96.76%,RSD为1.53%。结论:该方法简便易行、准确、重复性好,可用于花丹安神合剂的含量测定及质量控制。     

扣件式钢管模板支架在高大空间混凝土结构中的应用

一、工程概况 本工程名称为“济宁任兴商务中心”，位于山东省济宁市，本文主要讨论E区共享大厅屋面结构梁板模板及支撑体系工程，E区为共享空间，主要功能为门厅、展厅以及连廊，结构南北方向长度52．5m，东西方向长度32．1m，建筑面积1685m2，挑空高度21．35m，为全现浇钢筋混凝土结构，结构顶板为井字梁，结构标高为20．35m，模板搭设高度为21．35m。     

棕红壤无机颗粒的化学性质和形貌特征研究

土壤颗粒是土壤质地和结构的基本物理属性,其化学及形貌特征的变化能够指示土壤环境的变迁,研究颗粒的特征有助于了解土壤的成土过程和演化特点。以湖北省九宫山的基带棕红壤为研究对象,结合现代分析技术,研究不同粒级(2 000、450～2000、100～450和25～100nm)土壤颗粒的化学性质和形貌特征。结果表明,随粒级减小,土壤颗粒的pH值、比表面积和Zeta电位均逐渐增加;而电导率则逐渐减少。土壤颗粒随粒级减少,其粒径的正态分布图由不对称到对称、峰形由宽到窄,粒度由分散到集中。扫描和透射电镜图谱显示,450～2000和100～450nm颗粒表面光滑,形状规整,颗粒多呈杆状、多边形片状和细条状,少量颗粒出现层状堆垛的现象;而纳米颗粒(25～100nm)主要由无规则的堆垛而形成边缘为锯齿状的片状颗粒,少量颗粒为椭圆、片状、六方晶形、圆形和球状物质。     

印尼亚齐火电厂120m烟囱筒身滑模施工

印尼亚齐火电厂120m烟囱工程,外筒高117m,为钢筋混凝土结构。筒身段底部0m高程外半径为6.775m,壁厚0.42m;顶部外半径为3.85m,壁厚0.25m,+1.0m高程以上的筒身段混凝土采用滑模工艺。滑模采用悬索结构操作平台,由模板系统,操作平台系统,液压系统,垂直运输系统四部分组成。滑模施工共历时45天,平均每天滑升2.58m,施工效率与质量得到外方业主、监理的高度评价,值得推广应用。     

造价师常见问题解答(下)

(接上期)16.在钢筋混凝土墙和板中的预留洞,其留洞的模板工程量应该如何计算?答:在钢筋混凝土墙和板中的预留洞,按照其留洞的大小进行计算:单孔洞面积在0.3m2以内的,其混凝土的工程不予扣除,孔洞侧壁的模板工程量也不增加;单孔洞面积大于0.3m2的,其混凝土的工程量应该扣除,孔洞侧壁的模板工程量并入墙或者板的模板工程之中。     

固相萃取-高效液相色谱法测定方便面中抗氧化剂

目的:建立固相萃取-高效液相色谱法测定方便面中叔丁基对羟基茴香醚、二丁基羟基甲苯、特丁基对苯二酚3种抗氧化剂含量的分析方法。方法:采用无水乙醇作为提取溶剂、C18固相萃取柱提取净化,用高效液相色谱法对方便面中抗氧化剂含量进行测定,采用Phenomenex C18柱(5μm;250 mm×4.6 mm);甲醇和0.1%甲酸为流动相,梯度洗脱;柱温为25℃;流速为1 mL/min;检测波长为280 nm。结果:3种抗氧化剂在0.01~0.10 mg/mL浓度范围内具有较好的线性关系,相关系数分别为0.999 15,0.998 13,0.997 81,方法的精密度RSD为2.77%,加标回收率为89.33%~110.67%。结论:该方法分离效果较好、省时、便捷,可用于方便面中抗氧化剂的实际测定需要。     

高技术市场

在芯片制做过程中需要确保硅片上氧化层、Cu布线层和浅岛隔离非常均匀平坦。于是,化学机械研究CMP技术就成为精细半导体工艺中的最为关键性的技术,而且今后15年里DRAM设计规则由0.18μm向0.035μm迈进,微处理器件的栅栏长度由0.14μm向0.022μm发展。要求     

浅谈房屋建筑施工中玻璃钢模板的应用

玻璃钢模板是目前较为流行的房屋建筑模板。它以其平整度好、自重轻、接缝少、可重复利用率高等诸多优点被广泛应用于房屋建筑施工中。玻璃钢模板综合了玻璃和钢的特性,为混凝土提供了很好的支撑作用。本文从玻璃钢模板的特点出发,论述了玻璃钢模板的种类,并以房屋建筑施工中常用的玻璃钢圆柱模板为例,阐述了在房屋建筑施工中应用玻璃钢圆柱模板的施工工艺和质量控制要点。     

公铁两用大桥复杂高大墩身施工技术

合福铁路铜陵长江大桥主桥及公铁合建段铁路墩身采用双幅矩形空心墩,墩柱为单箱单室截面,墩顶盖梁为拱形框架结构,公路墩为M型实体框架结构,墩高46.9～51.2m。文章结合复杂高墩的结构特点,介绍了其支架、模板结构设计与施工技术特点。     

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.     

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。     

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.     

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.     

我国发展天文旅游的条件、前景探析及策略思考

天文旅游资源从成因可以分为行星地球天文旅游资源、天体天文旅游资源和天文文化旅游资源三类。天文旅游方兴未艾,我国天文旅游具有很大发展前景。文章对我国开展天文旅游的条件进行了分析,对发展天文旅游的策略和措施进行了梳理。     

城市社会的开放与农民的城市化

城市社会在对农民的开放与封闭之中徘徊。改革开放后城市社会对农民的开放已经使很多农民城市化。城市社会对农民的封闭已由政策性封闭转向经济性封闭。城市社会对农民的封闭增加了农民城市化的成本和社会风险。必须加强城市社会对农民的开放,逐步消除对农民的封闭政策,以推进农民的城市化。     

信息化时代商学院图书馆的建设与发展——中、美四大名校商学院图书馆建设的比较与启示

信息化时代中美商学院图书馆的建设与发展,成为当今时代高等商学教育发展与进步的一个重要环节,对中美四大商学院图书馆的发展状况、差距进行分析比较,对促进我国商学院图书馆事业的改革、建设和发展具有一定的启示作用和参考价值。