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As a result, a weak indirect cell is formed in high latitudes. By the 36th time step, the model atmosphere accomplishes the transition form one-cell circulation to two-cell circulation. There is a momentum source in the upper subtropical region. During the transition, the"polar westerlies jet"gets weakened and vanishes at the end, while the subtropical westerlies jet gets strengthened. At this two-cell stage, the generation and dissipation of westerly angular momentum do not balance each other, and the atmosphere is still at an unstable state with great surplus of angular momentum generation.

随着模式的运行，直接环流加强，地表东风带制造西风角动量加大，上支气流的加强，同样在科氏力的作用下，在副热带地区形成副热带西风急流，同时所谓的&极地西风激流&向赤道靠拢、减弱，最后消失，这时在整个半球形成了靠赤道的直接环流和靠极地一侧的间接环流，两圈环流形成的过程仅仅需要9个小时左右。

Corresponding to the long-lasting El Nio event, cyclonic anomalous circulation over the eastern North Pacific weakens slowly and anticyclonic anomalous circulation over the western North Pacific strengthens slowly at 850 hPa. Therefore the tropical Pacific westerly anomaly keeps long. The anomalous positive velocity potential over the western South Pacific at 200 hPa, which is related to the strong Australian winter monsoon, helps a long duration of El Nio. Corresponding to the short-lasting El Nio, the anomalous positive velocity potential over the western Pacific at 200 hPa moves eastward quickly and results in the vanishing of El Nio event.

还发现对于持续时间较长的El Nio事件，东北太平洋上850hPa异常气旋性环流减弱和西北太平洋上异常反气旋性环流增强较慢，因此赤道太平洋异常西风维持的时间也较长，而与澳大利亚冬季风加强相关联的南半球西太平洋的速度势正距平的维持，对El Nio的持续也起一定作用；对应持续时间较短的El Nio事件，西太平洋上200hPa速度势正距平的迅速东移，对El Nio的迅速消亡起重要作用。

In this round of global stock market adjustment, the Hang Seng Index has fallen far less than the Shanghai Composite Index, but Hong Kong shares end stronger reason, there are several: First, A shares The current average price-earnings ratio of 15 times, while Hong Kong stocks average price-earnings ratio of only 8 times, funds flow to the lower, resulting in the recent Hong Kong stocks rose, while the A shares are still hesitate to move forward; Secondly, the central rate repurchase focus on the H shares, a price comparison of the most typical is now China's oil price of A shares for more than 10 yuan, while the H shares with the right stocks, only 5 more than the Hong Kong dollar, of course, which流通盘size factor, but China's oil major shareholders to buy back its own shares will not take this factor into consideration, if the major shareholders have to consider if the cost of repurchase, H shares more attractive is beyond doubt; and thirdly, the size of the non-lifting of the ban is still in circulation is the pressure in the A share market, the head of a big mountain, but a typical example is the recent Haitong Securities to the size of the non-lifting of the ban period, the outstanding shares for 2.3386 billion shares of Haitong Securities, the size of the non-even up to 79.9396 billion shares, although the size of non-release is gradual, all in circulation there is a process, but it hung a "barrier lake" effect of the market fears.

恒生指数的跌幅远远高于上海综合指数，但香港股市年底更有理由较少，有几个：首先，A股目前的平均价格市盈率为15倍，而香港股市的平均市盈率仅8倍的比例，资金流量较低，在最近香港股市上涨造成的，而A股仍毫不犹豫地向前推进；第二，中央率，H股回购的焦点，一个最典型的价格比较现在是中国的石油A股超过10元的价格，同时拥有股票的H股中，只有5比港币，当然，而流通盘的大小的因素，但中国的石油大股东回购自己的股票将不考虑这一因素，如果大股东要考虑如果回购成本，H股更具吸引力是毋庸置疑的，第三，大小非解禁仍是流通是在A股市场的压力，一座大山的头部，但一个典型的例子是最近海通证券的大小非，禁售期间解除为2338600000的海通证券，在大小非流通股股份，甚至高达799.396亿股，虽然大小非释放是渐进的，所有流通有一个过程，但挂着&堰塞湖&影响市场的担忧。

In this round of global stock market adjustment, the Hang Seng Index has fallen far less than the Shanghai Composite Index, but Hong Kong shares end stronger reason, there are several: First, A shares the current average price-earnings ratio of 15 times, while Hong Kong stocks average price-earnings ratio of only 8 times, funds flow to the lower, resulting in the recent Hong Kong stocks rose, while the A shares are still hesitate to move forward; secondly, The focus of the central enterprises to buy back into the H shares, a price comparison of the most typical is now China's oil price of A shares for more than 10 yuan, while the H shares with the right stocks, only 5 more than the Hong Kong dollar, of course, there are流通盘size factor, but China's oil major shareholders to buy back its own shares will not take this factor into consideration, if the major shareholders have to consider if the cost of repurchase, H shares more attractive is beyond doubt; and thirdly, the size of the non-lifting of the ban circulation is still pressure in the A share market, the head of a big mountain, but a typical example is the recent Haitong Securities to the size of the non-lifting of the ban period, the outstanding shares for 2.3386 billion shares of Haitong Securities, the size of the non-even up to 79.9396 billion shares, Despite the size of the non-release is gradual, all in circulation there is a process, but it hung a "barrier lake" effect of the market fears.

恒生指数的跌幅远远高于上海综合指数，但香港股市年底更有理由较少，有几个：首先，A股目前的平均价格市盈率为15倍，而香港股市的平均市盈率仅8倍的比例，资金流量较低，在最近香港股市上涨造成的，而A股仍毫不犹豫地向前推进；第二，重点中央企业将购回的H股，一个最典型的价格比较现在是中国的石油A股超过10元的价格，同时拥有股票的H股中，只有5较港元当然，有流通盘的大小的因素，但中国的石油大股东回购自己的股票将不考虑这一因素，如果大股东要考虑如果回购成本，H股更具吸引力是毋庸置疑的以及第三，大小非流通的禁令解除仍然在A股市场的压力，一座大山的头部，但一个典型的例子是最近海通证券的非规模的解除班期间，二十三点三八六亿海通证券，在大小非流通股股份，甚至高达7993960.0万股份，尽管大小非释放是渐进的，所有的流通有一个过程，但它挂1 &堰塞湖&市场担忧的影响。

The problem of lost circulation in salt bed can be solved by using F27A anti-loss-circulation toughness reinforce agent for oil cement.

采用以F27A防漏增韧剂为主的多功能水泥浆体系有望解决易漏盐岩地层固井作业中相关技术难题。

To this end, the Administration for Industry and Commerce created the special supervision and management of food distribution Division, part of the future flow of food safety regulation of specific measures and methods developed by the Division, and the organization launched the circulation link food safety inspection, quality monitoring, development of the relevant market Access system, food security in the circulation link major commitment to deal with unexpected incidents disposal and investigation.

为此，工商总局此次特别增设了食品流通监督管理司，今后流通环节食品安全监管的具体措施和办法都由该司拟订，并组织展开流通环节食品安全的检查、质量监测、制定相关市场准入制度，发生流通环节食品安全重大突发事件承担应对处置和查处。

When heated from room temperature to set the temperature rose to the heating time less than 45 minutes, thus ensuring the full range of productivity.e, hot air circulation device is a 你好gh temperature, adjustable air volume, low noise plug-in fan; hot air circulation wind control gate; loop heat pipe and air filter and other components.

加热时从室温升至设定温度加热时间少于45分钟，从而也保证了全线的事情效率。e、热风轮回装置是通过耐高温、可调风量、低噪音插入式风机；热风轮回风量调治门；轮回管路及热空气过滤等组成。

The Yanzhao Metropolis Daily is the largest newspaper in Hebei and in North China as well. It has the strongest impact in the province. Since it started publication in 1996, its circulation has increased by a big margin. Now, the total of daily circulation has exceeded one million copies. At the 60th World Press Conference held in Capetown on June 4 to 6, 2007, the Yanzhao Metropolis Daily won the 39th place in the world's top 100 dailies.

燕赵都市报》是河北省乃至华北地区最大的平面媒体，也是河北省发行量最大的报纸：它自从1996年创刊以来，发行量年年都大幅度增长，现在日均发行100多万份。2007年6月4日至6日，在开普敦举行的世界报业协会第60届年会上，《燕赵都市报》荣居当年&世界报业百强&第39名。

The result showed that the strong storm followed by mesoscale squall line was primary cause of strong sandstorm producing, steps and ladders short wave trough of 500 hPa was great criterion triggering system for the mesoscale squall line producing, the essential dynamic condition was provided by distortion field and the mesoscale low pressure of 700 hPa for the strong sandstorm forming and maintaining in mid-west of Hexi Corridor, the deep vertical circulation development condition was basic power that urged squall line to occur and sand dust to curl up, which was provided for the deep convection development by superimposition of lifting movement before ground cold front and ascendant current of secondary circulation in upper air jet entrance region, temperature and the barometric gradient around the cold front was enlarged by enhancement of ground thermal low and temperature diurnalvariation of afternoon, by which essential thermal energy unstable condition was provided for the gale and strong sandstorm eruption, the strong sandstorm appeared in downstream of -200 m^2s^(-2) center of vertical helicity, the vertical helicity had good instruction significance for development of squall line and landing region of sandstorm, the mesoscale squall line occurred in unstable stratification, basic condition of potential energy transforming as kinetic energy was provided by strong unstable stratification for the strong sandstorm forming and developing.

结果表明：中尺度飑线所伴随的强风暴是产生强沙尘暴的主要原因；500 hPa阶梯短波槽是中尺度飑线产生的大尺度触发系统，河西走廊中西部700 hp变形场、中尺度低压为强沙尘暴形成和维持提供了必要的动力条件；地面冷锋前上升运动与高空急流入口区次级环流的上升气流的叠加，为深对流发展提供了深厚的垂直环流发展条件，是促使飑线发生和沙尘卷起的基本动力；地面热低压的加强和午后气温的日变化加大了冷锋前后的温度和气压梯度，为大风、强沙尘暴爆发提供了必要的热力不稳定条件；强沙尘暴出现在垂直螺旋度为－200平方公尺/s^2中心的下游，垂直螺旋度对飑线的发展和沙尘暴的落区具有较好的指示意义；中尺度飑线发生在不稳定层结内，较强的不稳定层结为强沙尘暴形成、发展提供了位能转化为动能的基本条件。

The comparisons of the corresponding time coefficient curve for1983 with those for 1981 and 1982 indicate that the summer monsoon circulation in ElNino years is weak,and the circulation transition from winter monsoon pattern tosummer monsoon pattern is...

其1983年的时间系数曲线与1981、1982年的差异表明，ElNino年夏季风环流弱，且其向北半球夏季型的转变期较正常年推迟。在西太平洋地区它表现为副高北进的滞后，用IAPGCM作的一个相应的数值试验证实了上述结果的正确。

John Robbins lives with his family in Santa Cruz, California.

约翰罗宾和家人居住在加利福尼亚州的圣克鲁斯县。

The international background is mainly the economic ties among different nations tented to be widen and deepen at the peace and development times.

国际背景主要是和平与发展时代条件下的世界各国经济贸易联系的日益加深。