偏心量e和缝纫线结构性能之间的关系

本文运用相关分析和多元逐步回归分析对缝纫线迹的偏心量e和缝纫线的结构性能之间的关系进行 了研究,发现偏心量e与缝纫线的弯曲刚度、线密度和摩擦系数的关系最密切。     

晋获断裂带古应力研究

晋获断裂带位于沁水盆地东部。其形成和演化对附近煤田的改造起着重要作用。本文通过对该断裂带切穿的灰岩中方解石双晶的研究，确定了古应力σｏ与Ｃ轴一致，σ３与Ｔ轴一致，研究表明晋获断裂带主要经历两期构造应力场作用，一期为南东东──北西西向，另一期为北东东──南西西向．应力场之差应力为４３．９ＭＰａ。     

e时代建筑设计师的职业精神

对建筑业进入e时代应具有的职业精神作了描述.讨论了其职业精神的运载形式、主体内涵和追求主题,回答了作为e时代的建筑师如何在设计中发现创新思想,如何实现设计创新的问题.     

e时代青年家纺色彩设计的趋势

e时代青年特有的成长经历和生活特征,导致了他们对于家纺色彩设计的特殊需求。文章从e时代青年主要生活特征入手,分析了该人群的色彩需求心理,并依据这些心理寻找出对应的色彩主题,从而分析e时代青年家纺色彩设计的4大趋势。     

基于单片机无线遥控水陆两栖清洁车的设计

为了更好地对陆地和水面的垃圾进行清理,本文采用现代机械设计方法,利用Pro/e三维实体建模仿真分析软件,对水陆两栖清洁车进行了结构设计,并利用Altium Designer Summer 09设计了水路两栖清洁车的电路系统,同时利用有限元分析软件ANSYS Workbench 14.0对关键零部件进行了有限元分析,分析结果表明,零件的上、下面和右下侧圆孔位置处会发生变形,最大变形量为0.126 9mm,因此,在实际使用中需要在零件的上方增加顶块以减小该零件的变形,以使清洁车整体更加稳定;零件所承受的最大应力为126.75MPa,远大于零件实际承受的应力,符合零件的强度要求;零件的最大应变发生在零件与车体的结合处,数值为0.000 633 77。该清洁车能够实现陆地和水面垃圾有效快速的清洁,并且能实现垃圾的自动压缩和倾倒,拓宽了现有设备的清洁范围,应用前景广阔。     

L i F e 1-yMg yP O4的制备及电化学性能研究

采用机械活化一步固相法, 在F e位掺杂 Mg 2+ 合成了结晶度较好的 L i F e 1-yMg yP O4。采用 XR D、S EM 等方法对L i F e 1-yMg yP O4的结构和形貌进行了表征, 利用恒电流充放电法研究了 Mg 2+ 掺杂对 L i F e 1-yMg yP O4电化学性能的影响。结果表明, 适量 Mg 2+掺杂不改变L i F e P O4的晶体结构, 同时可以细化颗粒粒径, 增强导电性和可逆性, 有效地提高L i F e P O4的倍率性能和循环稳定性。L i F e 0. 9 9Mg 0. 0 1P O4在0. 1C和1C倍率条件下首次放电比容量分别为1 5 8. 7mA h / g和1 4 1. 9mA h / g, 循环5 0次后放电比容量几乎没有衰减。     

食品从业人员e抗原阳性率变化分析

乙型肝炎是目前在食品从业人员上岗体检中发现较多的传染性疾病,e抗原阳性是被乙肝病毒感染的一项重要的判断指标,同时也是正处于传染期的标志。通过大力开展宣传教育、加强卫生管理、严格监督执法、食品从业人员e抗原阳性率逐年下降,取得了较好的效果。     

IEEE802.16e中的卷积Turbo码编译码算法研究

为了分析不同设计参数对IEEE802.16e中卷积Turbo码(CTC)性能的影响以及对比IEEE802.16e支持的CTC和卷积码的编码性能,介绍了IEEE802.16e中的CTC的编码过程,给出了编码过程中的循环状态确定方法的推导过程,分析了CTC的迭代译码结构和译码算法,最后对CTC的性能进行了仿真.仿真结果表明:在相同码率和相同调制方式下CTC的编码增益要比卷积码大,采用CTC比采用卷积码有着明显的性能优势.因此在码率较低、信道状况较好或对系统实时性要求严格的情况下,可考虑使用卷积码,以降低信道编码的复杂度;而在码率较高、信道状况较差或对误码率要求严格时,可考虑选用CTC编码方案,以保证通信的可靠性.     

IEEE802.16e OFDMA物理层子载波分配机制的研究

介绍了IEEE802.16e标准中WirelessMAN-OFDMA物理层规范,对其中的几种子载波分配方法进行比较,重点分析了上、下行PUSC分布子载波分配方法.同时使用MATLAB软件搭建OFDMA物理层仿真平台,对PUSC的性能进行仿真分析,仿真结果表明采用PUSC进行子载波分配后,OFDMA系统性能得到了改善.     

一种测定斜长石成分和结构态的改进双晶法

介绍一种在费氏台上由一个光率体定位与实测双晶轴相结合的改进双晶法。该法与以往方法相比,测试精度和测试效率都有较大提高,测试步骤相对减少。该法的运用,在一定程度上解决了多年来采用双晶法测试中酸性斜长石中的一些问题。     

方解石LA-(MC-)ICP-MS U-Pb定年技术及其在脆性构造中的应用

脆性构造形成于地壳浅层,记录了地壳浅层构造变形过程,精确限定浅层地壳变形时代是构造地质研究的热点和难点之一。由于脆性构造变形发生于较低的温压环境,岩石应变速率快,变质和交代作用相对较弱,难以形成韧性构造变形中可定年的同构造新生矿物,所以脆性构造的精确定年一直是学界难题。近年来,方解石U-Pb定年技术取得重要进展,通过脆性构造变形同构造方解石脉U-Pb定年可以精确限定构造变形时代。对近几年方解石LA-(MC-)ICP-MS U-Pb定年技术研究进展进行总结,系统地介绍了同构造方解石脉特征、方解石U-Pb定年基本原理、方解石LA-(MC-)ICP-MS U-Pb定年方法及应用实例,指出该方法目前存在的关键问题和技术难点在于方解石U-Pb年龄代表的地质意义和其定年的成功率。野外识别同构造方解石脉,划分不同期次方解石,确定原生域和次生域能够准确揭示其年龄的地质意义; 圈定最优待测靶区,选择合适的普通铅校正方法以及寻找理想的方解石标样有利于提高定年结果精度和准确性。     

Experiments on and predictions about properties of sand bonded by microbe cement

Microbe cement as a new bonding material is presented. Sandstone (0.05 m diameter, 0.5 m height) and sandpile (0.125 m³) are joined by microbe cement to make a whole body. Evolutions in the related properties of treated sand samples are examined through compressive strength and calcite content. Results indicate that the structure of the cemented body is nonuniform, that the calcite content decreases with distance from the injection port, and that the compressive strength also decreases with distance from the injection port. In addition, evolutions in the measured calcite content and compressive strength are summarized by a numerical model that considers microbe concentration distribution. The numerical results of the calcite content at different positions for 0.5 m height sandstone are similar to the test results, and the experimental results for calcite content and compressive strength of 0.125 m³ cubic sandpile are similar to the numerical results. Prediction results indicate that the simulations should become a significant supplementary tool when microbe cement is applied in actual engineering projects.     

广西平乐硅灰石中碳质物的赋存特征

采用X射线衍射（XRD）及扫描电子显微镜（SEM）等方法,对广西平乐以层控接触热变质作用为主,并伴随有接触交代作用的叠加所形成的硅灰石中黑色碳质物的物相及存在特征进行了研究。发现硅灰石中的碳质物为石墨,并分别与多种矿物紧伴生。伴生情况有：（1）与硅灰石,方解石紧密伴生;（2）与石英,方解石紧密伴生;（3）与方解石紧密伴生;（4）呈尘埃状或星点状包裹于硅灰石矿物颗粒中;（5）以浸染方式存在于硅灰石矿物颗粒中。欲将碳质物从硅灰石矿物中解离出来,至少要将矿石粉碎到0.043mm以下。另外,还发现硅灰石中的碳质物严重降低硅灰石粉的白度。     

Rheological investigations of the improved fine scheelite flotation spiked with agitation medium

The fine scheelite flotation using garnet and glass beads as agitation medium was investigated through slurry rheology and froth property analysis. The apparent viscosity of fine scheelite, calcite and quartz (?20 μm) slurry were measured and the corresponding scheelite flotation behaviours, froth water recovery and froth height were studied. It was found that calcite slurry could aggregate into network structures and exhibit much higher apparent viscosity at the vicinity of pH 8.5–9.0 than scheelite and quartz (scheelite, calcite, and quartz slurry at 20.34, 38.66, and 14.58 mPa·s, respectively). Agitation medium containing garnet and glass beads could reduce the slurry apparent viscosity by effectively dispersing the calcite network structures in flotation slurry, and improve the fine scheelite flotation selectivity. As the apparent viscosity was reduced, the froth water recovery decreased from 24.33% to 6.37% and initial froth height of the flotation froth decreased from 69.6 to 8.7 mm, and finally results in increase in separation efficiency from 23.10% to 31.96%. The results could be potentially used in flotation of fine minerals by applying agitation medium to improve the process selectivity.     

Influence of compaction pressure on the accelerated carbonation of calcium hydroxide

Mineral carbonation using waste cement is a promising method to solve the problems caused by CO₂ emission and waste cement. Compaction pressure is an important parameter for mineral carbonation of calcium hydroxide, one of the most dominant composite of waste cement that can be carbonated. The carbonation degree, morphology of products and compressive strength of carbonated compacts are influenced by compaction pressure significantly. Results show that the carbonation degree of calcium hydroxide increases at first (0-8 MPa) and then decreases in the higher compaction pressure range (10-14 MPa). At the meantime, results also indicate that lower compaction pressure accelerates the early carbonation but hinder carbonation in the later stages. For the morphologies of carbonation products, calcium carbonate tends to form typical crystal morphology of calcite (rhombohedral) under lower compaction pressure, while it will become ellipsoid-like when compaction pressure reaches 8 MPa. TGA and water content results show that there is an optimal water content for the carbonation. In addition, lower water content is adverse to the carbonation at later stage and the CO₂ is difficult to penetrate into the inside of compacts when water content is high, which will hinder the carbonation. XRD and TGA results show that the carbonation products are calcite and small amount of amorphous calcium carbonate.     

微生物在石英砂中诱导方解石沉积的实验研究

利用巴斯德芽孢杆菌和培养基来处理石英砂,与不含菌的对照样品相比,其固化效果比较明显。通过X-射线衍射分析处理后的样品,发现其中有方解石晶体生成。通过扫描电子显微镜可观察到石英砂颗粒的缝隙之间紧密地填充有大量的方解石晶体,由于方解石晶体本身具有胶结作用,从而使得石英砂颗粒能够胶结在一起。放大至10000倍可看到这些晶体表面附着有杆状菌体。能谱分析的结果也证明巴斯德芽孢杆菌在石英砂中诱导沉积出了方解石晶体。通过测算得出在本试验条件下（500mL含活菌5×10^9个的巴斯德芽孢杆菌菌液用urea—CaCl2重悬后与50g石英砂混合装入60mL注射器中,urea—CaCl2以重力作用流过注射器）方解石的产量平均为2．178g。     

A modified integrated model of the internal structure of Chinese cultured pearls

Optical and micro-infrared microscope were used to observe the internal structure and mineral composition of high and low quality Chinese seawater and freshwater cultured pearls.Results clearly reveal that aragonite and calcite are found in seawater cultured pearls,but vaterite is not found.In contrast,vaterite and aragonite are found in freshwater cultured pearls,but calcite is not found.Based on our analysis and observations of the internal structure of high and low quality cultured pearls,a modified integrated model of the internal structure of Chinese cultured pearls was established.Our revisions to the previous model focus on significant differences within the prismatic layer of Chinese cultured pearls.     

Effect of treatment process on consolidation efficiency of fugitive dust cemented by bio-activated cementitious material based on CO2 capture

As a new green and environmental material, bio-activated cementitious material is attracting extensive attention. This study confirmed that the bio-activated cementitious material could mineralize and cement fugitive dust into the calcite- consolidation-layer based on CO₂ capture and utilization. The results illustrated that treatment processes (non-pressure spraying, pressure spraying, non-pressure blending and pressure blending) had a strong effect on the microstructure and properties of calcite-consolidation-layer. According to the analysis of X-ray diffraction (XRD) and Fourier transform infrared (FTIR), calcite was prepared by bio-activated cementitious material during the cementation process. Meanwhile, scanning electron microscopy (SEM) and thermogravimetric-differential scanning calorimetry (TG-DSC) were adopted to measure the corresponding variation of porous characteristics and calcite content caused by different treatment processes. The results indicated that the microstructure of calcite-consolidation-layer from the spraying process had lower porosity and higher content of calcite than from blending processes. In addition, the mechanical properties of calcite-consolidation-layer were also tested. The hardness and compressive strength, which reached 19.5 GPa and 0.6 MPa, respectively, of calcite-consolidation-layer from the pressure spraying process were higher than those from the other three treatment processes. Compared with the non-treatment process, the four treatment processes had superior wind erosion resistance. Under the wind speed of 12 m/s, the mass loss of calcite-consolidation-layer from the pressure spraying process decreased from 2150.2 to 23.8 g/(m² h).     

陆生蜗牛文石方解石化过程及其碳同位素组成变化高温实验

在过去全球气候变化研究中,生物CaCO₃壳体的稳定同位素组成是常见的古气候替代性指标,被用来重建古气候变化历史,而生物成因文石质矿物的方解石化则是自然界较为常见的现象,该过程会导致生物壳体稳定同位素组成发生改变,从而影响古气候重建的准确性。利用陆生蜗牛Achatina fulica的文石壳体在空气背景下进行高温加热实验,来揭示加热前后样品中方解石含量和碳同位素组成的变化。结果表明:随着温度的升高,方解石含量增高;文石方解石化过程受壳体有机质含量的影响,相同加热温度和时间条件下,未采用双氧水处理的方解石含量比采用双氧水处理的方解石含量低;高温加热的壳体样品比原始样品碳同位素组成偏负;较短时间实验条件下,温度对文石方解石化过程起主导作用,并且双氧水处理也会对文石方解石化有所影响;造成样品碳同位素组成偏负可能是因为加热过程中样品与空气CO₂发生了碳同位素交换反应,而不是因为矿物相变。因此,在利用蜗牛壳体碳同位素组成进行古环境重建时,需考虑文石方解石化过程对壳体碳同位素组成变化的影响。     

微生物诱导方解石沉积加固的影响因素

通过比较用巴斯德芽孢杆菌处理介质前后的重量,应用单因素方法研究各种条件和环境对微生物诱导方解石沉积加固的影响。结果表明：①当培养基中ca^2＋浓度为25．2mM时,巴斯德芽孢杆菌诱导沉积的方解石产量最高;②培养基为碱性时,巴斯德芽孢杆菌所诱导沉积出的方解石的产量则较为接近;③巴斯德芽孢杆菌诱导沉积出的方解石的终重量与活菌数呈反比;④在30℃时,巴斯德芽孢杆菌诱导沉积的方解石产量最高;⑤巴斯德芽孢杆菌所诱导沉积出的方解石的产量随石英砂和海砂混合物中海砂所占比例的增大而减小;⑥随着培养基中Ni^2＋浓度增大,巴斯德芽孢杆菌诱导沉积的方解石产量显著降低。