吉合库河隧洞工程施工材料供应条件分析

文中首先对吉合库河隧洞工程特性与主要工程量进行总结,并对施工场地进行地质条件分析,结果表明该施工区位于山间河谷盆地,并存在有洪积扇,且已成为草地或被开垦为耕地,同时为发现未有新洪积扇形成或者已经停止发育,河谷呈现宽浅的“U”且十分开阔,符合施工建设要求。工程建设Ⅰ#砂砾石料场位于博拉河枢纽区下游尕加毛南侧的博拉河左岸高漫滩上,除有机质颜色未达到标准色,其他测定指标完全符合质量技术要求。Ⅱ#砂砾石料场位于吉四木贡玛北侧的博拉河右岸高漫滩上,除中溶盐、可溶盐含量低于规定要求,有机质颜色未达到标准色、孔隙率稍偏大外,其余各项指标均符合质量技术要求。Ⅲ#砂砾石料场位于博拉乡上游博拉村南侧的博拉河左岸Ⅰ级阶地及高漫滩上,除有机质略浅于标准色、孔隙率稍偏大、含泥量偏高外,其余各项指标均符合质量技术要求。

建筑工程材料试验检测技术及优化措施探究

本项探索性工作深度剖析了建筑材料检测工作,关键在于提高检测精度和操作效能,首先,阐述了高端检测技术,比如无损检测和精细分析技术,这些手段能够深入挖掘材料的本质特性。考量了多样环境要素下材料特性评估的稳定性,涉及极端气候条件下的验证步骤,研究了数据加工与管理技术在建筑材料检测方面的应用,特别强调,数据驱动的决策对于提高建筑工程材料的质量控制至关重要,最终,一系列切实可行的措施提出,旨在优化检测流程并提升工程材料的质量水平。

工艺条件对石英质多孔陶瓷性能的影响研究

以长江沿岸低品位石英砂为主要原料,高岭土为增塑剂,通过配料、混料、成型、干燥、烧结等工艺制备高性能石英质多孔陶瓷,通过对其工艺条件对烧结体性能影响的研究,改善石英质多孔陶瓷的性能。结果表明,优化石英质多孔陶瓷的控制条件为:高岭土用量为31%、水料比为1.4、烧结温度为1150℃、保温1 h,制备出外形完整的石英质多孔陶瓷,其气孔率为49.88%,抗压强度为5.01 MPa。

炼钢﹣连铸用新型耐火材料评价方法的探讨

随着炼钢﹣连铸技术的发展,钢铁新材料的不断涌现,对耐火材料的性能要求越来越高,"长寿化、无污染、功能化"新型耐火材料的应用不断增加,原有的耐火材料技术条件不能完全适应其发展。文章就炼钢-连铸用长寿命滑板砖、功能化连铸"三大件"及微膨胀高铝砖等新型耐火材料评价方法进行了探讨并提出了建议,对准确评价其各项性能具有一定的指导意义。

生物降解材料国家最新标准简述

((受控堆肥条件下材料最终需氧生物分解和崩解能力的测定采用测定释放的二氧化碳的方法》GB/T1 9277-2003 本标准规定了一种测定方法,用于将材料作为有机化合物在受控的堆肥化条件下,通过测定其排放的二氧化碳量来确定其最终需氧生物分解能力,同时测定在实验结束时材料的崩解程度。

传承历史 拓展视野 立足创新——谈陈礼忠雕刻艺术

工艺美术是中国文化传统的重要组成部分,它与中国美术的其他形式一样源远流长、百花齐放。在其自身的发展中所形成的历史积淀相当深厚,尤其是各个地方的特色非常鲜明。当我们谈到工艺美术的时候,一般都要谈到三个条件:首先是工艺美术的材料条件,也就是各种材质所体现的自然属性。比如说石、木、漆等等;其次是非常重要的地域属性,工艺美术是跟一定区域性的文化特点相结合形成的具有浓烈地方风格的传统艺术;最后是工艺美术在欣赏传播过程中所带有的文化属性。

沥青预处理塔设备的制造

对大型12Cr2Mo1R复合N08825合金材料沥青预处理塔的制造过程进行了阐述,重点介绍了12Cr2Mo1R的材料采购技术条件、焊接工艺以及制造加工过程和容易出现问题的解决方法。成功完成了沥青预处理塔的制造,并符合设计和工艺要求,提高了我公司在这种材料制造领域的竞争力。

Forming regularity and relation between composition and property of B_2O_3-BaO-ZnO glass

B2O3-BaO-ZnO glass was prepared by using conventional melt quenching technology. The forming regularity and the relationship between the composition and the property of B2O3BaOZnO glass were investigated. The results show that the composition range for forming B2O3BaOZnO glass is very wide, but the content of B2O3 has a limit within mole fraction of 25%75%. When the content of B2O3 is over the limit, the melt will be divided into two phases with different compositions and structures, whereas too low content of B2O3 will result in the crystallization of the melt during the cooling process. The thermal expansion coefficient, the transition temperature and the resistivity of the glass at room temperature are （510）×10 -6℃ -1, 480620℃ and （1.53.0）×10 10Ω·m, respectively.

Extraction,Physiochemical Properties and Antibacterial Activities of Polysaccharides from Auricularia auricular

[Objective] To explore the optimal conditions for extracting polysaccharide from Auricularia auricular, and to study its physiochemical properties and antibacterial activities. [ Method] The extraction conditions for Auricularia auricular polysaccharides were optimized by orthogonal test, and its physiochemical characteristics and antagonistic activities on bacteria and molds were tested. I-Result] The optimized condition was with sample to liquid ratio of 1 ： 50, temperature of 90 ℃ and extraction time of 2.5 h. Under the optimized condition, the yield of pelysaccharide was 7.3%, with polysaccharide content of 77.81%. Containing aldose and amylase, the polysaccharides of Auncu/aria auricular was soluble in water. The inhibitory effect on bacteria was significantly stronger than on molds that the minimum diameter of inhibition zone for bacteria is 12.7 mm, while 7.9 mm for the molds. [ Conclusion] This study provides scientific basis for the development and utilization of Auricularia auricular polysaccharides.

Influence of synthesis parameters on the properties of LiFePO4/C cathode material

The influence of sintering temperature, carbon content and dispersive agent in bail-milling was investigated on the properties of LiFePO4/C prepared using Fe2O3, NH4H2PO4, Li2CO3 and glucose via solid state reaction. X-ray powder diffraction, scanning electron microscopy and charge-discharge test were applied to the characterization of the LiFePO4/C samples synthesized under different conditions. Sintering temperature affects the crystallite/ particle size and degree ofcrystallinity of LiFePO4, formation of Fe2P and maintenance of carbon in LiFePO4/C. Car- bon maintenance is favored by low sintering temperature, and 700 ℃ is optimum for synthesis of LiFePO4/C with superior electrochemical performance. A higher carbon content in the range of 4.48%-11.03% results in a better rate capability for LiFePO4/C. The dispersive agent used in ball-milling impacts the existent state of carbon in the final product which subsequently determines its charge-discharge behavior. The sample prepared at 700 ℃ by using acetone as the dispersive agent in ball-milling exhibits an excellent rate capability and capacity retention without any fade at 0.1 C, 1C and 2C, with corresponding average discharge capacities of 153.8, 128.3 and 121.0 mA·h·g-1. rest2ectivelv, in the first 50 cvcles.

Free vibration analysis of non-homogeneous orthotropic plates resting on Pasternak elastic foundation by Rayleigh-Ritz method

Free vibration analysis of non-homogeneous orthotropic plates resting on a Pasternak type of elastic foundation is investigated. A set of admissible orthogonal polynomials are generated with Gram-Schmidt orthogonalization procedure and adopted in the Rayleigh-Ritz method. Accuracy and applicability of the method are examined by comparison of the results for different boundary conditions and material types with those available in literature. It is found that this method has good accuracy regardless of type of boundary condition and yields very accurate results even with low number of terms of orthogonal polynomials for the first mode of vibration. For higher modes of vibration, higher terms of orthogonal polynomials should be used. The effects of foundation parameter, density and non-homogeneity parameters on natural frequency are examined. It is concluded that natural frequency of plates are more sensitive to shearing layer coefficient rather than Winkler coefficient and density parameter has weakening effect on natural frequency.

Photocatalytical Inactivation of Enterococcus faecalis from Water Using Functional Materials Based on Natural Zeolite and Titanium Dioxide

The functional materials based on natural zeolite （clinoptilolite）, TiO2-zeolite and Ag-TiO2-zeolite have been successfully synthesized by solid-state reaction in fast-hydrothermal conditions. The obtained functional materials were investigated by X-ray diffraction （XRD）, FT-1R （Fourier transform infrared） spectroscopy, DRUV-VIS （diffuse reflectance ultraviolet-visible） spectroscopy, BET （Brunauer-Emmett-Teller） and SEM/EDX （scanning electron microscope/energy dispersive X-ray spectrometer） analyses. The XRD results indicated that the clinoptilolite structure has a good thermal stabilization after the fast-hydrothermal treatment. Also, the high specific surface area about 92.55 m^2.g^-1 was noticed for Ag-TiO2-zeolite functional material. The presence of dopants was evidenced from EDX spectra. The enhanced bactericidal activity of Ag-TiO2-zeolite catalyst is proved through damaging of Enterococcusfaecalis colonies under visible irradiation, at different material doses and irradiation times.

Foundation Assessment in Different Parts of Iraq Using STAAD Pro V8i

Foundation is considered as one of the main parts of any structure. The type of foundation used is highly dependent on the type and properties of soil. The design of foundations requires many factors that should be defined. There are number of differences in the geological and soil conditions in Iraq. As a consequence, these differences are reflected on the type of foundation to be used. Despite these differences, same materials and style of buildings are used all over Iraq. The main problems of Iraqi soil are high gypsum content, salinity and shallow water table depth. These factors that influence the foundations are the soil properties and the amount of loads that transmitted by the superstructure. The situation has been analysed through a case study which illustrated the link between soil and foundation types in three different parts of Iraq （Mosul, Baghdad and Basra）. One building was analysed using ＂STAAD （structural analysis and design）. Pro＂ software in these regions. It is evident that Iraqi designers and engineers require local code to define all the loads, materials and design of the foundation to be used. The use of local materials might be very effective from both engineering and economic perspectives.

The Influence of Transmutation Conditions on the Adulteration Performance of Nano-scale Nickel Hydroxide

Spherical Nano-scale nickel hydroxide was prepared through precipitation transmutation method by controlling the transmutation conditions in this paper. The measurement results of XRD and TEM indicate that the crystallization of the nano-scale nickel hydroxide isβ-style and its shape is spherical with a diameter of 40～70 nanometer. The adulteration experiment shows that the adulteration ratio of nano- scale Ni(OH) 2 in common spherical micrometer-scale Ni(OH) 2 exists a optimal value (1∶9). And at this point, the utilization ratio of Ni(OH) 2 in electrodes can be raised by 10%, and the nano-scale nickel hydroxide with sphericity shape shows a better adulteration performance than that with needle shape.

Density of Electron States and Volume of Solution of Hydrogen in SiC Alloys

The new reactor concepts are characterized by higher efficiency, better utilization of nuclear fuel and nuclear waste minimization. This approach means that it is necessary to continue a continued research and test of new materials in order to apply them in new reactors. In this study, the authors fbcused on the analysis of SiC alloys because, due to their particular properties, this alloy can be used in high temperature conditions where the pure silicon, semiconductor material par excellence, is inadequate to support them.

Experimental study of free abrasive wire sawing by using multi-strands wire

Grains in the slurry can be brought into cutting zone by steel wire with a certain speed to achieve the purpose of removing the workpiece material in the free abrasive wire sawing machining. Because its own of multi- strands characteristics, we use it to replace the steel wire to do slicing experiment. In this paper, multi-strands wire is made by seven metal wires and has many grooves on its surface. Compared with steel wire, it can carry more grains into cutting zone which is conducive to improving the slicing efficiency. We do some comparative slic- ing experimcnts by applying multi-strands wire （~b0.25 mm） and steel wire （~b0.25 mm） to cut optical glass （K9）. The results show that slicing efficiency and the surface roughness of the workpiece sliced by using multi-strands wire are better than that by using steel wire. but the kerf width of the former is wider than that of the latter in the same experimental conditions.

Investigation of Nitration Processes of iso-Octanol with Mixed Acid in a Microreactor

In this paper, the nitration characteristic of alcohols with mixed acid for the synthesis of energetic mate-rials in a stainless steel microreactor was investigated experimentally. The nitration of iso-octanol with HNO3-H2SO4 mixed acid was chosen as a typical model reaction which involved fast and strong exothermic liquid-liquid heterogeneous reaction process. The influences of mixed acid composition, flow rate, organic/aqueous flow ratio and reaction temperature have been investigated. The results indicated that the reaction could be con-ducted safely and stably in the microreactor at 25-40°C, which are enhanced compared to 15°C or below for safe operating conditions in the conventional reactors. Moreover, the 98.2% conversion of iso-octanol could be obtained and no by-products were detected in all cases.

Production of carbonaceous material from avocado peel for its application as alternative adsorbent for dyes removal

Adsorption processes have received special attention for contaminants removal thanks to their capability to gen- erate effluents with high quality as well as their simple design. In the current work, the agro-waste residue avo- cado peel is proposed to be used as alternative to conventional activated carbons whose use is sometimes restricted to high costs, upgraded by their exhausting after long term operations. The carbonization procedure was optimized and analyzed through factorial design and response surface methodology by evaluating temper- ature （400-900 ℃） and time （30-90 min） effects： optimal conditions were found at 900℃ and 65 min, gener- ating an adsorbent with 87.52 m2.g 1 of BET surface area, a mesopore volume of 74% and a zero point charge at 8.6. The feasibility of the carbonaceous material was proved for the removal of a variety of dyes by investigating substrate （10-50 mg.L 1） and solid （0.5-20 g.L-1） concentration effects and statistical significance： complete removal of Naphthol Blue Black and Reactive Black 5 was reached under optimal conditions （10 mg.L 1 and 20g.L 1 of dye and solid, respectively）, while Basic Blue 41 was eliminated by using 13.4 g. L- 1 of the adsorbent. Overall, dyes removal by adsorption on carbonized avocado peel is presented as a promising technology due to the low cost and easy availability of the precursor, as well as the straightforward generation, the satisfactory char- acteristics and the proved adsorption capacity of the adsorbent.

Potential of acoustic emissions from three point bending tests as rock failure precursors

Development of failure in brittle materials is associated with microcracks,which release energy in the form of elastic waves called acoustic emissions. This paper presents results from acoustic emission measurements obtained during three point bending tests on Nestos marble under laboratory conditions.Acoustic emission activity was monitored using piezoelectric acoustic emission sensors,and the potential for accurate prediction of rock damage based on acoustic emission data was investigated. Damage localization was determined based on acoustic emissions generated from the critically stressed region as scattered events at stresses below and close to the strength of the material.

Dependence of surface morphology of CVD diamond films on deposition conditions

The diamond films have been deposited by the hot filament CVD method on molybdenum substrates from the mixture reactant gas of acetone and hydrogen.The surface morphologies of the obtained diamond films under various deposition conditions have been observed by scanning electron microscope(SEM).The experimental results strongly indicate that the surface morphologies of the resulting films have closely related to the deposition conditions,i.e.,reaction pressure.For molybdenum substrates,under the lower reaction pressure the surface morphologies of the grains comprising the resulting films mainly display the small single crystal cubo-octahedron and double small crystal cubo-octahedron;under the higher reaction pressure,the surface morphologies mainly display the large cauliflower-like.These results show that there are various crystal habits for CVD diamond under various deposition conditions.