王峪口水库库岸滑坡特征及形成机制

王峪口水库库岸滑坡地层主要为一套上新统砾石层、夹砂层、粘土层．区内滑坡具有明显的分期性与群发性特点．滑坡形成的主要原因是该套地层夹有饱水软化的粘土层和易于液化的饱水砂层;地震则可能是其触发因素．     

巴塘县夏塞蓝刚玉矿地质特征

对蓝刚玉矿的地质特征、矿石类型及蓝刚玉特征作了简述,并对蓝刚玉的成因进行了初步探讨,提出了找矿标志。     

水电工程长隧洞开挖造价问题的探讨

由于水电工程长隧洞受地质条件影响受勘测条件和勘探手段的限制以及施工难度大,变化因素多等原因其开挖造价问题较复杂。因此,在水电工程长隧洞开挖定额项目中应考虑短循环进尺因素,增加按围岩分类的补充调整系数,考虑长隧洞开挖艰难因素,补充洞长增加系数     

浅论我国农业新技术革命

当今,农业与相关科学技术的迅速发展使世界农业正孕育着一场革命,结我国农业发展带来闻机遇和压力,我们需加强农业新技术和理论的研究,抢占制高点,加速农业产业化进程,改革科技体制,加强国际合作与交流,发展信息农业,抓住机遇迎接挑战。     

松潘—甘孜造山带中丹巴地区变质岩演化及其地质意义

丹巴地区位于松潘—甘孜造山带中部。区域动热变质作用主要发生于印支晚期—喜马拉雅早期,与深层滑脱-逆冲作用有关。根据特征矿物组合．丹巴地区变质岩可划分出六个变质带：绢云母—绿泥石带、黑云母带、石榴子石带、十字石带、蓝晶石带和夕线石带。石榴子石生长环带代表每段时间矿物晶体边部的平衡,可用于推测石榴子石生长时的P－t轨迹。利用石榴子石—黑云母温度计和石榴子石—斜长石—Al2SiO5-石英压力计得到石榴子石的参考温度、压力,根据环带定量计算得到的变质作用p-t轨迹为顺时外形式,与其所处的构造背景为大陆碰撞造山带是一致的。     

雪峰山加里东造山运动及其体制转换

本文论述了雪峰山地区加里东造山运动的变形序列,加里东运动期间,至少存在３个连续的构造热事件。并且阐述了挤压体制向伸展体制的转换,形成低角度滑脱带,高角度正断层及变质核杂岩。     

湘西北西向褶皱系的发育特征及其研究意义

湘西地区的北西向构造以北西向褶皱变形为主,它横跨于该区北东向构造带之上,并对汞矿床等具有重要控制作用。     

State of China's climate in 2021

This report is a summary of China's climate, as well as major weather and climate events, during 2021. In 2021, the mean temperature in China was 10.5°C, which was 1.0°C above normal (1981–2010 average) and broke the highest record since 1951. The annual rainfall in China was 672.1 mm, which was 6.7% above normal. Also, the annual rainfall in northern China was 40.2% above normal, which ranked second highest since 1961. The rainstorm intensity in the rainy season was strong and featured significant extremes, and disasters caused by rainstorms and flooding were more serious than the average in the past decade. In particular, the extremely strong rainstorm in Henan during July and autumn caused flooding in the middle and lower reaches of the Yellow River with severe consequences. Heatwaves occurred more frequently than normal, and their durations in southern China were longer than normal in summer and autumn. Phased drought was obvious, and caused serious impacts in South China. The number of generated and landfalling typhoons was lower than normal; however, Typhoon In-fa broke the record for the longest overland duration, held since 1949, and affected a wide area. Severe convective weather and extreme windy weather occurred frequently, causing serious impacts. The number of cold waves was more than normal, which caused wide-ranging extremely low temperatures in many places. Sandstorms appeared earlier than normal in 2021, and the number of strong dust storm processes was more than normal.摘要2021年, 中国气候暖湿特征明显, 全国平均气温10.5℃, 较常年偏高1.0℃, 创下了1951年以来最高纪录; 全国平均降水量672.1毫米, 比常年偏多6.7%, 其中北方地区平均降水量较常年偏多40.2%, 为1961年以来第二多. 汛期暴雨过程强度大, 极端性显著, 河南特大暴雨灾害影响重, 黄河中下游流域秋汛明显; 高温过程多, 夏秋南方高温持续时间长; 区域性, 阶段性气象干旱明显, 华南干旱影响较重; 台风生成和登陆均偏少, “烟花”陆地滞留时间长, 影响范围广; 强对流天气强发, 极端大风频发, 局地致灾重; 寒潮过程多, 强度大, 极端低温频现; 沙尘天气出现早, 强沙尘暴过程多.     

The effects of semi-lunar spring and neap tidal change on nutrients cycling in the intertidal sediments of the Yangtze estuary

During a semi-lunar tidal cycle from full moon till new moon, tide is characterized by the periodic change in spring and neap tide. Under the in situ conditions of light and temperature, the influence of a semi-lunar spring and neap tidal cycle on nutrient cycling in intertidal flat of the Yangtze estuary was simulated in the laboratory in July 2002. Lab experiments showed that NH₄⁺ and PO₄^3– were always released into overlying waters, while NO₃^– was directed into sediments in the permanently waterlogged systems, suggesting that the long-term waterlogged sediment acts as a significant source for NH₄⁺ and PO₄^3–, and a sink for NO₃^– in water columns. In contrast, reflooding of intertidal sediments after long-term desiccation promoted the considerable effluxes of NH₄⁺, NO₃^– and PO₄^3– into overlying waters, reflecting that the long-term exposed sediment is an important source for nutrients in overlying waters. In addition, the semi-lunar tidal cycle led to the intricate depth distribution patterns of nutrients in intertidal sediments. During long-term exposure, NH₄⁺ in sediments was quickly transformed into NO₂^– and NO₃^–, while organic P pool might be converted to slightly adsorbed and iron-bound P. Therefore, it is considered that the semi-lunar tidal circulation has the significant influence on the biogeochemical cycle of nutrients in intertidal systems.     

步进电机控制系统

介绍步进电机控制系统的硬、软件设计及在潮汐模拟系统中的应用．以８０３１－ＣＰＵ为主控器，详述了其结构、分时控制、电源共享，异步运行和调速的实现方法．潮汐模拟结果表明以上方法简单、稳定、易于实现．