英国庞特里代格罗斯近百年采矿史

以英国中威尔士矿区庞特里代格罗斯村为中心的半径5英里范围内,有好几座高产矿山:如利斯本矿山公司的弗兰戈赫矿、洛高拉斯矿、格罗法赫矿和格罗华尔矿、格罗永宁矿、克密司瓦斯矿和艾斯盖姆永矿等。有的是17世纪老矿,有的建于18世纪。在19世纪50、60和70年代当铅价持续坚挺的二十年内曾达到过顶峰,当时低银的铅精矿一般可售14英镑/吨。

浅谈花园湖进洪闸混凝土施工中温控措施的应用

一、工程概况花园湖进洪闸位于花园湖上口门,闸中心线桩号HY0＋800,与淮河中心线夹角54°,上至宁洛高速公路桥1.0km。该闸由闸室、两岸连接建筑物、上游铺盖、下游消力池及上下游导流堤等建筑物组成。闸室采用钢筋混凝土开敞式倒＂Π＂结构,共27孔,单孔净宽12.00m,总净宽324.00m。

侍酒师，葡萄酒文化的最佳诠释者

1.The Charm of Wine葡萄酒的魅力在人类漫长的历史长河中,有这样一种神奇而浪漫的饮料,它伴随着人类文明一起发展,它是人类文明的结晶、是世界传统文化中必不可缺的一部分,它就是能够带给人们美的享受的葡萄酒。古往今来,关于葡萄酒的描绘不尽其数,无论是中国古代的大诗人李白、王翰,还是国外的大文豪雨果、卢梭都因葡萄酒获得了无穷的灵感,写出了脍炙人口的篇章,让人们更形象地感受到葡萄酒的魅力。葡萄酒文化的博大精深也需要每个人最宝贵的一切:分辩能力,深思熟虑的选择,亲近而尊重,精心的护理,来真正的理解它!

国务院安委会办公室关于近期高速公路多车尾随相撞交通事故情况的通报

安委办[2012]24号各省、自治区、直辖市及新疆生产建设兵团安全生产委员会:6月3日5时20分左右,江苏省盐城市深海高速公路1013公里至1017公里区间,双向接连发生7起多车尾随相撞交通事故,共造成11人死亡、19人受伤。经初步调查,事故发生路段有团雾。6月9日21时12分左右,安徽省亳州市蒙城县境内宁洛高速阜蚌段下行线272公里600米至273公里370米区间,接连发生9起多车尾随相撞交通事故,共造成11人死亡、

“在某种意义上,她在传播希望”——在2015年美国“国家年度教师”颁奖仪式上的讲话

欢迎诸位光临白宫,今天是我喜欢的日子之一,因为有机会认识一些人——他们通常付出了许多,却并未得到相应的回报。每一天,我身后的这些老师们,把他们的全部——知识、创造力、注意力和爱都奉献给了学生。他们为孩子提供空间,牺牲时间并消耗精力,然后第二天早上起来,将所有工作再重复一遍。因此,今天是向老师们说谢谢的好机会。

设计创新领航 科技彩虹贯通——访南京重大路桥建设指挥部常务副总指挥武焕陵

南京长江第四大桥在南京城市总体规划的过江通道——"五桥一隧"布局中占有重要地位,也是南京"绕越高速环线"的重要组成部分。南京四桥与绕越高速东南段以及宁淮高速、宁洛高速、南京长江三桥,及同步建成通车的绕越高速东北段形成完整的高速公路绕越环线。从南京交通规划图上可以看出,长江四桥将江南沿江公路和江北沿江公路相连;将宁启高速公路贯通南京城区及南京南方城镇;将宁杭高速公路直接贯通江北公路网;它也为沪宁高速与宁连、宁通、宁淮、宁埠等高速公路的联系提供了另一个方便的途径,同时将大大减轻二桥的过江压力,使南京交通更加畅通。

Key technologies for the construction of the Xiluodu high arch dam on the Jinsha River in the development of hydropower in western China

Hydropower development in China is concentrated in the country's western regions.Among all the rivers in China,the lower course of the Jinsha River contains the richest hydro-energy resource,and therefore,4 mammoth hydropower plants are under construction on this particular section of the river at Wudongde,Baihetan,Xiluodu,and Xiangjiaba.The water-blocking structures of the hydropower facilities at Wudongde,Baihetan and Xiluodu are all arch dams of around 300 m high.In view of changes in the geological conditions at the foundation of the Xiluodu dam on the riverbed after excavation started,the designs of expanding foundation surface excavation and dovetailing the dam body and foundation rock on both upstream and downstream sides were introduced,allowing the arch dam and foundation to fit each other and improving the stress conditions of the dam body and foundation.By dividing the dam body into various concrete sections,the dynamic properties of concrete were adequately adjusted to the distribution of stress in the dam body.In addition,the use of the most optimal concrete material and mixture ratio allowed thermodynamics of concrete to satisfy the requirements of the strength,durability,temperature control and crack prevention of the concrete.Moreover,rigorous temperature control measures were introduced to prevent harmful cracking,thus enhancing the integrity of the arch dam.Furthermore,sophisticated construction machinery,scientific testing methods,and sound construction techniques were employed to ensure the uniformity and reliability of concrete placement.The "Digital Dam" for the Xiluodu project,which is based on the theory of total life cycle,has supplied strong support for construction process control and decision-making.

Thermodynamic properties of San Carlos olivine at high temperature and high pressure

In this study, the thermal expansion and heat capacity of San Carlos olivine under high temperature and high pressure are reported. Combining accurate sound velocity data under different P–T conditions with density and heat capacity data at ambient pressure, the density,adiabatic bulk modulus, shear modulus, and most importantly, thermal expansion and heat capacity, of San Carlos are extracted to 14 GPa by a numerical procedure using classic thermodynamic relationships. These data are in agreement with published findings. To estimate the temperature gradient in the upper mantle, we also report the fitting equations of thermal expansion and heat capacity of San Carlos olivine as a function of both temperature and pressure to the P–T condition of the 410 km discontinuity,which provide the thermodynamic properties with increasing depth in the Earth's interior.

Monte Carlo Simulation for the Adsorption of Symmetric Triblock Copolymers

The adsorption behavior of symmetric triblock copolymers, Am/2BnAm/2, from a nonselective solvent at solid-liquid interface has been studied by Monte Carlo simulations on a simple lattice model. Either segment A or segment B is attractive, while the other is non-attractive to the surface. Influences of the adsorption energy, bulk concentration, chain composition and chain length on the microstructure of adsorbed layers are presented. The results show that the total surface coverage and the adsorption amount increases monotonically as the bulk concentration increases. The larger the adsorption energy and the higher the fraction of adsorbing segments, the higher the total surface coverage is exhibited. The product of surface coverage and the proportion of non-attractive segments are nearly independent of the chain length, and the logarithm of the adsorption amount is a linear function of the reciprocal of the reduced temperature. When the adsorption energy is larger, the adsorption amount exhibits a maximum as the fraction of adsorbing segment increases. The adsorption isotherms of copolymers with different length of non-attractive segments can be mapped onto a single curve under given adsorption energy. The adsorption layer thickness decreases as the adsorption energy and the fraction of adsorbing segments increases, but it increases as the length of non-attractive segments increases. The tails mainly govern the adsorption layer thickness.

Potts Model on Maple Leaf Lattice with Pure Three-Site Interaction

We use Monte Carlo method to study three-state Potts model on maple leaf lattice with pure three-site interaction. The critical behavior of both ferromagnetic and antiferromagnetic cases is studied. Our results confirm that the critical behavior of the ferromagnetic model is independent of the lattice details and lies in the universality class of the three-state ferromagnetic Potts model. For the antiferromagnetic case the transition is of the first order. We have calculated the energy jump and critical temperature in this area. We find there is a tricritical point separating the first order and second order phases for this system.

Monte Carlo Simulation of Coil-to-Globule Transition of Compact Polymer Chains:Role of Monomer Interacting

Coil-to-globule transitions are fundamental problems existing in polymer science for several decades;however, some features are still unclear, such as the effect of chain monomer interaction. Herein, we use Monte Carlo simulation to study the coil-to-globule transition of simple compact polymer chains. We first consider the finite-size effects for a given monomer interaction, where the short chain exhibits a one-step collapse while long chains demonstrate a two-step collapse, indicated by the specific heat. More interestingly, with the decrease of chain monomer interaction, the critical temperatures marked by the peaks of heat capacity shift to low values. A closer examination from the energy, mean-squared radius of gyration and shape factor also suggests the lower temperature of coil-to-globule transition.

Comparative Optical Separation of Racemic Ibuprofen by Using Chiral Stationary Phase

Ibuprofen is widely used as a non-steroidal anti-inflammatory drug and produced as racemic mixture. Its pharmacological activity resides only in S-(+)-enantiomer, and R-()-enantiomer is not only inactive but also has many side effects. Thus it is necessary to separate R-enantiomer from racemic ibuprofen. We studied optical separation of racemic Ibuprofen with chiral high performance liquid chromatography (HPLC). Out of three different chiral stationary phases, which were selected on the basis of structure and availability, two were found to be ef-fective. There was optimum eluent composition for each stationary phase for good resolution in optical separation. Resolution decreased with increase of eluent flow rate, but effect of injection volume on resolution was insignificant at high eluent flow rate.

Silica-Alumina Refractory Synthesis based on Moroccan Granitic Geo-Materials

Andalusite rich schist until now has not been utilized to produce refractory. In this work, refractory materials were elaborated from alumina-silica geomaterials related to granitoids and their direct surrounding rocks （kaolin clay and andalusite fiche schist）. Characterization evolution on heating was investigated in a composition （80% kaolinitic clay, 20% andalusite rich schist）. The evolution of mullite was examined by SEM （scanning electron microscopy） and XRD （X-ray diffraction）. The thermal shock test showed that the refractory sample has a good thermal shock resistance.

Stochastic Optimal Control of First-Passage Failure for Rectangular Thin Plate Vibration Model under Gaussian White-Noise Excitations

A rectangular thin plate vibration model subjected to inplane stochastic excitation is simplified to a quasinonintegrable Hamiltonian system with two degrees of freedom. Subsequently a one-dimensional Ito stochastic differential equation for the system is obtained by applying the stochastic averaging method for quasi-nonintegrable Hamiltonian systems. The conditional reliability function and conditional probability density are both gained by solving the backward Kolmogorov equation numerically. Finally, a stochastic optimal control model is proposed and solved. The numerical results show the effectiveness of this method.

船山先师诞辰感怀

古祠寥落壁苔斑。遗像荘严髣髴间。今日蒸尝同阙里。昔时经卷老荒山。瓣香不愧承濂洛。高节真堪起懦顽。正值横流遍中国。黄书读罢泪长潜。题何秀才性存二如遗稿湘潭唐传杜蓂陔我朝三百载。大节出黄宫。衮衮谁家子。滔滔此日同。乾坤拼一死。犬马识孤忠。

Gradient Microstructure of K4169 Superalloy Prepared by Low Voltage Pulsed Magnetic Field Combined with Directional Solidification

The influence of the low voltage pulsed magnetic field(LVPMF)on the microstructure transition of K4169 superalloy was investigated.The gradient microstructure of K4169 superalloy composed of columnar grains,coarse grains,and fine grains was prepared through the combined method of LVPMF with directional solidification,which provided a new approach for the preparation of superalloy with gradient microstructure.The distribution of the Lorentz force and flow field under LVPMF effect was simulated,and therefore the microstructure transition mechanism was revealed.Results show that the microstructure transition should be attributed to the coupling effects of the Lorentz force and forced convection.

周口师范学院

周口师范学院是河南省属普通本科高校,地处三皇故都、老子故里、陈楚旧地、历史文化名城周口市。周口历史悠久,文化灿烂,人杰地灵,素有"华夏先驱,九州圣迹"之誉。颍河、沙河、贾鲁河在此交汇,不尽东流;漯阜铁路连线京九和陇海线,横穿周口;宁洛高速、大广高速在此交汇,是连南贯北、承东启西的重要交通枢纽。学校校园内花木交荫,绿围翠绕,鸟语花香,四季如春,风光旖旎,景色宜人。

对佩洛的回答

我认识佩洛已经30多年了,它是美国的主要马克思主义经济学家之一。我曾把他当作朋友和同志。对他的专著和文章我并不完全同意。我们常常在通信和刊物上进行争论。现在既然佩洛想坦率地进行争论,那么,我也要直接了当地说,它的文章是教条主义的典范。

桌面小物:文艺的治愈系

＂人随物安定,物随人长久＂,这是前两天偶然间读到的一句话。＂人＂因为有＂物＂的陪伴而感到安定舒适,＂物＂因为有＂人＂的爱护而生命更加长久,简单的几个字词,却让人心底升起一股莫名的温暖,认真想想,人与物的关系不正是如此么？一个房间,一个角落,一张书桌,阳光透过窗格懒懒地洒在桌面上,

浅议公路工程施工单位体制改革

浅议公路工程施工单位体制改革张文忠在改革开放大潮推动下，河南省公路建设又获可喜进展，沿黄河的三门峡、洛阳、郑州、开封四市均架设了黄河公路大桥，纵横全省的国道中，１０７线已建成高等级公路，３１０线在改善的基础上又并行着增铺一条汴、郑、洛高速公路。现在，...