南陵县近山铜矿矿体特征及开采技术条件浅析

近山铜矿位于南陵县城275°方向,直距17.5km,行政区划现隶属芜湖市南陵县工山镇管辖.铜矿体赋存于三叠系下统南陵湖组(Ttn2)及东马鞍山组(T2d)组地层中,矿体严格受岩体接触带矽卡岩控制.矿体形态在剖面上呈似层状、透镜状及不规则状,平面上呈长条状、透镜状或囊状等.1号主矿体总体走向近东西,倾向北,倾角45 ～70°;2号主矿体总体走向北东,倾向北西,倾角30-65°.矿床开采技术条件综合归类为Ⅲ-3类型.矿床成因类型为接触交代矽卡岩型铜矿床.     

双层柱面网壳结构的风振响应研究

柱面网壳结构在实际工程中的应用以双层网壳居多,且属于柔性结构,其在风荷载作用下的风振响应不容忽视。本文以某实际双层柱面网壳结构为背景,建立有限元模型,进行模态分析之后在频域中采用风洞试验获取的A类风场条件下结构表面风荷载数据进行风振位移响应计算,给出了峰值位移响应随风向角变化的结果。结果表明：在试验风向角90o-180o范围内150o风向角是该结构的位移响应控制性风向角。     

安徽省区域铀矿化特征探讨

本文依据赋矿主岩和岩浆活动对铀矿的成矿作用,将安徽省内铀矿化类型划分为碱性岩型、花岗岩型、碳硅泥岩型、砂岩型、火山岩型、变质岩型及伟晶岩型七大类型.根据具体含矿岩性、成矿作用和成矿环境异同,将七大类型细分成14个亚类型.按矿体产出部位对安徽省内主要铀矿类型的碱性岩型外带亚型划分为接触带-断裂-岩性层控式(丁家山式)、砂岩残留体式(大龙山式)两个成矿式.安徽省内铀矿化主要分布在金寨-西汤池铀成矿远景带、沿江铀成矿远景带及广德-屯溪铀成矿远景带三条铀成矿带上,其中沿江铀成矿远景带是安徽省内重要的铀成矿带.     

河南省确山县赵庄片麻岩(碎云母)矿地质特征及开发前景

矿区属片麻岩、片岩混合岩化型(碎云母)矿,矿床勘探类型为Ⅱ类.在矿区内发现厚大矿体一个,呈似层状,矿体分布标高为150～252m,埋深0～5m.矿体倾向20°～40°,倾角20°～30°,矿体长770m,厚度11.34～187.38m,片麻岩(碎云母)矿平均碎云母含矿率67.13％.估算片麻岩(碎云母)风化壳型矿(122b)+(333)资源量矿石量398.37万吨,碎云母矿物量270.16万吨.估算采矿证标高范围内风化壳型和原生型矿(122b)+(333)资源量矿石量1410.33万吨,碎云母矿物量946.71万吨.矿区水文地质条件及工程地质条件简单,环境地质条件中等,矿石易采易选,加工性能良好.     

葫芦岛市小德营子乡水泥石灰石矿床地质特征

本文主要论述葫芦岛市小德营子乡水泥石灰石矿的矿区及矿床地质特征,根据矿区岩石类型及组合认为,该矿床为典型的化学或生物化学沉积矿床。     

缓倾斜薄矿体采场顶板沉降观测及其安全预报

锡矿山锑矿童家院矿床的玉号矿体为顶板不稳固的缓倾斜薄矿体,目前采用锚杆护顶尾矿似膏体胶结充填法开采,采场回采过程中顶板不留矿石护顶层,采用锚杆支护,回采结束后及时充填处理采空区。同时,采用各种仪器设备对采场顶板进行沉降观测与安全预报,最大限度地降低了矿石损失、贫化,提高了回采率,保证了采场顶板的安全,提高了矿山开采经济效益。     

河北省涞源县南赵庄矽卡岩型铅锌矿床成矿模式

本文在简要介绍南赵庄铅锌矿床地质特征的基础上将该矿床划分三个矿化阶段：镁矽卡岩阶段、钙矽卡岩阶段以及石英-硫化物阶段。通过研究矿石的矿物的五种组合特征,揭示了成矿环境的变化,并分析主要矿石闪锌矿的化学成分随其颜色的变化规律。笔者认为渗透作用是形成矿区矽卡岩的主要原因,矿体多产于辉石-石榴石矽卡岩、辉石矽卡岩与大理岩的接触带上。在此基础上进一步解释矽卡岩型中低温热液矿床的成矿模式,对该矿床找矿理论的发展具有现实意义。     

晋宁磷矿矿床地质特征及成因探讨

滇东沉积磷块岩矿床是云南省重要的磷矿石资源基地,晋宁磷矿位列其中,晋宁磷矿矿区位于康滇地轴东南侧、昆明凹陷西缘,王家湾向斜西翼。本文主要阐述了矿区地质、矿床地质特征、矿石结构构造、矿石类型,并对成矿环境和矿床成因作了深入分析和探讨。     

浅谈山东泰山玉的矿物学特征

泰山玉主要由叶蛇纹石组成,杂质矿物有磁铁矿、碳酸盐、滑石、绿泥石、斜方辉石、云母、黄铁矿、褐铁矿、硫镍矿等。泰山玉矿床是由富镁超基性岩受高温气体要液体作用变质而成,属变质超基性岩浆矿床。泰山玉分为泰山碧玉、泰山墨玉及泰山花斑玉三种类型。泰山玉矿属变质超基性岩浆矿床,多呈不规则扁豆体,产于蛇纹石花、蛭石化强烈处,呈似板状断续赋存于蛇纹石岩与脉体的接触带。     

子波分解重构技术在金家地区储层预测中的应用

金家地区沙一段沉积类型以三角洲平原河道、前缘砂体及滨浅湖滩坝为主,横向变化快,纵向上岩性以砂泥岩互层为主,灰岩少量发育。由于灰岩物性差,速度高,地震反射能量强,因此,灰岩上下有利砂岩储层难以有效识别。笔者针对此问题提出了利用子波分解重构后的资料剔除灰岩影响的研究方案,实现了对灰岩上下有利砂岩储层的预测,有效得指导了滚动开发部署。     

Carbohydrate ingestion improves endurance performance during a 1h simulated cycling time trial

This study examined the effect of carbohydrate ingestion on metabolic and performance-related responses during and after a simulated 1h cycling time trial. Eight trained male cyclists (VO 2 peak = 66.5ml kg -1 min -1 ) rode their own bicycles mounted on a windload simulator to imitate real riding conditions. At a self-selected maximal pace, the cyclists performed two 1h rides (separated by 7 days) and were fed either an 8% carbohydrate or placebo solution. The beverages were administered 25 min before (4.5ml kg -1 ) and at the end (4.5ml kg -1 ) of the ride. With carbohydrate feeding, plasma glucose tended (P = 0.21) to rise before the time trial. Compared with rest, the plasma glucose concentration decreased significantly (P < 0.05) at the end of both rides, with no statistically significant difference being observed between treatments. Thereafter, plasma glucose increased significantly (P < 0.05) at 15 and 30 min into recovery, and was significantly higher at 30 min during the carbohydrate trial compared with the placebo trial. No significant changes in plasma free fatty acids were observed during the ride. However, a significant increase (P < 0.05) in free fatty acids was found at 15 and 30 min into recovery, with no difference between trials. Mean power output was significantly (P < 0.05) greater during the carbohydrate compared with the placebo trial (mean - S.E.: 277-3 and 269-3W, respectively). The greater distance covered in the carbohydrate compared with the placebo trial (41.5-1.06 and 41.0–1.06km, respectively; P < 0.05) was equivalent to a 44s improvement. We conclude that pre-exercise carbohydrate ingestion significantly increases endurance performance in trained cyclists during a 1h simulated time trial. Although the mechanism for this enhancement in performance with carbohydrate ingestion cannot be surmised from the present results, it could be related to a higher rate of carbohydrate oxidation, or to favourable effects of carbohydrate ingestion on the central component of fatigue.     

Science and medicine of rowing: A review

The biology and medicine of rowing are briefly reviewed. Effort in a 2000 -m race is about 70% aerobic. Because the boat (and in some instances a cox) must be propelled, successful competitors are very tall, with a large lean mass and aerobic power. Large hearts may lead to erroneous diagnoses of a cardiomyopathy. Large respiratory minute volumes must be developed by chest muscles that are also involved in rowing. The vital capacity is typically large, and breathing becomes entrained. Expiration cannot be slowed relative to inspiration (as normally occurs at high rates of ventilation) and the limiting flow velocity may be reached, with the potential for airway collapse. Performance is strongly related to the power output at the ‘anaerobic threshold’, and lactate measures provide a guide to an appropriate intensity of endurance training. Peak blood lactate levels are higher in males (commonly 11–19 mmol·l -1 and occasionally as high as 25 mmol·l -1) than in females (9–11 mmol·l -1), probably because males have a greater muscle mass in relation to blood volume. The skeletal muscles are predominantly slow twitch in type, developing an unusual force and power at low contraction velocities. Many rowers have a suboptimal diet, eating excessive amounts of fat. Lightweight rowers also have problems of weight cycling. Aerobic power and muscle endurance often change by 10% over the season, but such fluctuations can be largely avoided by a well-designed winter training programme. Injuries include back and knee problems, tenosynovitis of the wrist and, since the introduction of large blades, fractures of the costae.     

全国城乡学生体质20年动态分析

基于1985、1995和2005年全国学生体质调研数据,对各时期我国城乡学生形态、机能、体能发展水平进行系统地定量研究,动态分析20年全国城乡学生体质发展的特点与规律。主要研究结果：（1）近20年城乡学生生长发育持续提前,城市学生各项形态指标生长水平高于乡村,身高城乡差距缩小,体重、胸围城乡差距加大;（2）城市学生肺活量水平高于乡村,城乡学生肺活量20年持续下降,前10年乡村学生下降快、后10年城市学生下降快;（3）乡村学生800m、1000m跑水平高于城市,城市女生50m跑、仰卧起坐水平高于乡村,其他素质城乡学生水平波动较大;（4）城市女生50m跑20年持续下降,城乡学生800m和1000m跑、城市学生50m×8往返跑20年加速下降,其他素质20年间有增有降发展极不平稳。     

定向运动对大学生身心健康发展的实践研究

采用测量、问卷调查、数理统计等方法,分析定向运动学习前后对大学生身心健康的影响.结果经T检验和x2检验且表明：定向运动不仅能增强学生体质健康水平,而且有助于学生的情绪调节,增强自信心与创新意识,培养勇敢顽强的意志品质,建立良好的人际关系,能有效地促进学生身心健康发展.为了全面提高大学生整体素质,积极实践,构建定向运动课内外一体化教学模式,进行定向运动课程模块化教学,以满足学生的多元化需求.     

Identifying home advantage in international tennis and golf tournaments

A regression analysis of competitors' tournament results in relation to their world rankings was proposed to identify the effect of home advantage in international ‘grand-slam’ tennis and ‘major’ golf tournaments. The results provided little evidence of home advantage in either the grand-slam tennis or the golf tournaments held in 1993. The only possible evidence of home advantage was found in the Wimbledon tennis and the US Open golf championships. Even these findings can be explained, at least partially, by (1) the availability of information concerning the low world rankings of the British tennis players competing at Wimbledon, and (2) selective entry, allowing only the world's top-ranked foreign golfers into the US open golf tournament. In both cases, the lower ranking home competitors have a greater opportunity to perform above their anticipated world rankings. Therefore, provided entry into tennis and golf tournaments is truly ‘open’ to both the host nation's representatives and foreign competitors alike, home advantage does not appear to be a major factor influencing the competitors' performance in such competitions. These findings may be explained by the relatively objective nature of the scoring systems used in tennis and golf, unlike the subjective influence of refereeing decisions on the results of team-games such as soccer.     

摔跤常见技术动作开始的发力特征研究

采用专门研制的摔跤测力装置,对过胸摔、挟颈背、拉臂转移和滚桥技术动作开始发力的力学特征进行测试分析,结果表明,上述动作开始的发力具有力值大和力的梯度大的特点,均有爆发用力的特征。其中过胸摔和滚桥主要把位发力最大,其总合力和力的梯度也最大。     

按摩器刺激对提高普通高校健美操专选学生柔韧性训练效果的实验研究

柔韧素质是健美操专业学生的专项素质之一,通过对普通高校健美操专业学生分组对照进行柔韧性训练的实验研究,认为对训练肌群辅以按摩器振颤刺激,可大大提高柔韧性训练效果。     

我国城市体育自然环境建设与发展的研究

采用实地调查研究、理性思维研究和文献资料调研等方法对主要问题进行了专门研究，提出了进行城市体育场所区域生态功能区划、设计体育生态功能区布局的方案、做好体育场所绿色环境系统规划、制定体育场所生态与绿地管理措施等基本观点，提出了若干城市体育自然环境建设与发展的对策。     

我国体育市场管理法规研究

采用调查法和比较法对全国体育市场立法和管理现状进行调查,对部分较早出台并有一定代表性的省市的体育市场管理法规的立法和管理情况进行了研究,提出了体育市场管理立法和管理的原则、基本程序、措施及其一般模式,为规范全国体育市场管理提供参考依据。     

重新认识体育的社会关联

体育与政治之间存在一个悖论，体育的发展与经济实力之间没有直线相关，体育与教育部分重叠，体育与宗教最为近缘，体育可借用科学手段，体育的艺术禀性日益明显，体育与养生反映着两种人生观。