水磨石表面固化剂处理施工技术

前言上个世纪八十年代,水磨石以其价格低廉、取材方便和良好的使用性能而成为一种高档建筑装饰材料。现在,随着水磨石工艺的不断改进,因其节约资源、美观大方、光而不滑等特点重新被人们所接纳和喜爱。然而如何使已经有风化现象、磨蚀现象的水磨石能够恢复其原来的光泽与美感,其主要技术要点在于能够在水磨石的表层重新打造一层玻璃质薄膜。本工法介绍的是采用混凝土密封固化剂对水磨石表面进行处理,提高水磨石的使用年限。

彩色水磨石地面施工技术

一、工程概况 湖北省工业建筑总公司直属工程处承建的襄樊市残疾儿童康复中心工程是联合国儿童基金会合作项目。该工程设计为六层框架结构,总建筑面积2762m^2。内装饰地面有水泥砂浆地面和彩色水磨石地面,其中,除少数房间外,1～6层的大面积彩色水磨石地面共2440m^2。经质检部门验收评定,水磨石地面10个分项合格率96％,优良率56％,被评定为单项优良工程。 二。

大理石圆柱面板的加工

大理石圆柱面板的加工是大理石加工中难度较大的一项加工。以往的方法是:用小型摆式锯,垫高石料,进行锯割;大圆盘研磨机粗磨;手扶研磨机研磨和抛光;切断机切割。这一方法虽能加工出产品,但效率低、出材率低、合格率低、质量低、成本高、劳动强度大。为改变这种落后状况,北京市大理石厂在加工人民大会堂φ2000×1000和φ1680×1000毫米的圆柱面板时。

TBM tunneling in extremely hard and abrasive rocks:Problems,solutions and assisting methods

Extremely hard and abrasive rocks pose great challenges to the past and ongoing TBM projects by increasing cutter wear and reducing penetration rates.A considerable amount of research has been conducted to improve the performance of TBMs in those challenging grounds by either improving the capacity of TBMs or developing assisting rock breakage methods.This paper first highlights the challenges of hard and abrasive rocks on TBM tunneling through case studies.It then presents the development of hard rock TBMs and reviews the technologies that can be used individually or as assistance to mechanical excavators to break hard rocks.Emphases are placed on technologies of high pressure waterjet,laser and microwave.The state of the art of field and laboratory research,problems and research directions of those technologies are discussed.The assisting methods are technically feasible;however,the main challenges of using those methods in the field are that the energy consumption can be over 10 times high and that the existing equipments have robustness problems.More research should be conducted to study the overall energy consumption using TBMs and the assisting methods.Pulsed waterjet,laser and microwave technologies should also be developed to make the assistance economically viable.

Mechanochemical preparation and application of graphdiyne coupled with CdSe nanoparticles for efficient photocatalytic hydrogen production

Graphdiyne(GDY)has attracted considerable attention as a new two-dimensional(2D)carbon hybrid material because of its good conductivity,adjustable electronic structure,and special electron transfer enhancement properties.GDY has great potential in the field of photocatalytic water splitting for hydrogen evolution,owing to its unique properties.In this study,GDY was successfully prepared by the mechanochemical coupling of precursors C_(6)Br_(6) and CaC_(2) using a ball-milling approach.The prepared GDY,especially its microstructure and composition,was well characterized using different techniques such as X-ray diffraction,scanning electron microscopy,transmission electron microscopy,X-ray photoelectron spectroscopy(XPS),Fourier-transform infrared,and Raman characterization techniques.By exploiting the unique two-dimensional(2D)structure and outstanding light absorption properties of GDY,GDY/CdSe 2D/0D heterojunctions were successfully established and applied to photocatalytic hydrogen evolution.The hydrogen evolution activity of GDY/CdSe-20,a type of composite material,reached 6470μmol g^(-1) h^(-1),which is 461 and 40 times higher than that of GDY and CdSe,respectively.Moreover,the fine electrical conductivity of GDY enabled rapid and effective transfer of the photogenerated electrons in CdSe into the hydrogen evolution reaction.The transfer path of the photogenerated electrons was studied through XPS with in situ irradiation,and a reasonable mechanism for the hydrogen evolution reaction was proposed.This study provides a feasible approach for the large-scale preparation of GDY and demonstrates the prospects of GDY in the field of photocatalysis.

Disturbance rejection control for Raymond mill grinding system based on disturbance observer

In the Raymond mill grinding processes,high-accuracy control for the current of Raymond mill is vital to enhance the product quality and production efficiency as well as cut down the consumption of spare parts.However,strong external disturbances,such as variations of ore hardness and ore size,always exist.It is not easy to make the current of Raymond mill constant due to these strong disturbances.Several control strategies have been proposed to control the grinding processes.However,most of them(such as PID and MPC)reject disturbances merely through feedback regulation and do not deal with the disturbances directly,which may lead to poor control performance when strong disturbances occur.To improve disturbance rejection performance,a control scheme based on PI and disturbance observer is proposed in this work.The scheme combines a feedforward compensation part based on disturbance observer and a feedback regulation part using PI.The test results illustrate that the proposed method can obtain remarkable superiority in disturbance rejection compared with PI method in the Raymond mill grinding processes.

机械化施工队好处多

我省建筑业由于技术革新和技术革命运动的深入发展,生产条件起了迅猛的变化,原来的劳动組織已經不能适应或者不完全适应生产力高速度发展的要求了。为了及时改进劳动組织,省第一工程公司第二工程处在党委的领导下,群策群力,在南郊工地的磨石、油漆、抹灰、鋼筋、白铁等六个工种中試行了机械化施工队。实踐証明,这是当前建筑施工方面的一种較好的劳动組織形式。机械化施工队,是在队组管理的基础上,把有关的中小型机械設备固定在队組,由队组負責使用、調度、保管和維修。队組成員一般为二十五人左右,队內設有正副队长和指导員各一人,并設有核算、統計、材料机具管理、定额考勤、安全质量管理和生活福利管理等不脫产的六大员。

大蒜粉制作方法

把大蒜加工成大蒜调料粉,便成为各种菜肴的生熟调味品,是大蒜加工增值、出口创汇的好门路。其制作方法如下:一、原料选择要选择蒜头大、蒜瓣肉色洁白、无霉烂、无病虫害、无机械损伤、无萌芽的大蒜头.二、清洗去皮用清水洗净蒜头,剥开分辨,在冷水中浸泡一小时,搓掉蒜皮.三、粉碎蒜瓣将洗净、去皮并晾干的蒜瓣在打浆机或打粉机中打成浆(加适量干净的水)后。