变冷

From 6860 to 3170 cal.yr BP,semi-desert steppeexpanded,regional montane forest steppe retreated,suggesting a prolonged warm and dryclimate.Between 3170 and 2340 cal.yr BP,regional forest steppe expanded whereassemi-desert steppe retreated,indicating the climate became cool and wet gradually and thehumidity reached the maximum at the end of this stage.During 2340～1600 cal.yr BP,Poaceae steppe dominated whereas wetland meadow expanded and the montane forest stepperetreated,suggesting a cool and wet climate prevailed,wormwood grass steppe prevailed andthe climatic instability increased after 1600 cal.a BEThe climate and environmental reconstructions by pollen were supported by the diatomrecords.A relative high lake level and moister climate prevailed between 8660 and 7230 cal.yr BP as inferred by the dominance of planktonic diatom genera and high planktonic/benthicratio (〉40).low lake level and dry climate sustained during 7230～2330 cal.yr BP assuggested by the low abundance of planktonic diatom and low planktonic/benthic ratio ～20and the lake returned to high level during 2330～930 cal.yr BP as inferred by there-dominance of the planktonic diatom and the high value of palnktonic/benthic ratio.The pollen-based climate reconstruction was also consolidated by the grain size andPediastrum concentration records.

Ugii Nuur湖周围现代孢粉研究表明：松属为空气传播的外来花粉，其含量变化可能指示了远山森林草原发育状况；禾本科具显著低代表性，母体植物建群时含量通常在10％以下：藜科花粉含量可以指示区域气候干旱程度。2、以现代孢粉研究为基础、可靠AMS~(14)C年代为框架，Ugii Nuur孢粉记录高分辨率地重建了蒙古国中部地区过去8660 cal.yr BP以来的植被和气候变化。8660～7800 cal.yr BP研究区植被为禾草草原，湖畔及河谷低地发育苔草草甸，远山发育松属针叶林和森林草原，气候温和略湿润；其中8350～8250 cal.yr BP湿生草甸扩张，旱生植物成分减少，气候凉湿。7800～6860 cal.yr BP旱生成分增加，气候转向暖干。6860～3170 cal.yrBP半荒漠草原扩张，远山森林草原退缩，山地草原和河谷及湖畔湿生草甸退缩，气候持续暖干。3170～2340 cal.yr BP半荒漠草原退缩，远山森林草原扩张，气候转凉变湿，末期湿度条件达最佳。2340～1600 cal.yr BP禾草草原发育，湖畔及河谷低地湿生草甸扩张，远山森林草原略有退缩，气候总体较凉湿。1600 cal.yr BP以来研究区发育禾草-冷蒿草原，气候波动较大。

According to experts, cold-finished seamless pipe Tsunehiro There are two ways: one is hard-drawn method is to pipe by pulling drawing die, so steel tapered, elongated; the other way is to cold-rolling method, which is Meng Mannesmann brothers invented the hot-rolling mill used in the cold in the method.

据恒博无缝管专家介绍冷加工有两种方法：一种是冷拔法，就是将钢管通过拔管模拉拔，使钢管逐渐变细、伸长；另一种方法是冷轧法，它是将孟内斯曼兄弟发明的热轧机应用于冷加工中的方法。

The city has a lot of disappointment, even the sky has become the Hui Leng.

这个城市有太多的失望，连天空也变得灰冷了。

No orchard's the worse for the wintriest storm; but one thing about it, it mustn't get warm," wrote Robert Frost in his poem "Good-bye, and Keep Cold.

没有果园的更坏的因为极其寒冷的暴风雨；但是一件事情关于它。它不可以变暖和，&罗伯特·弗罗斯特写在他的诗&再见，和保持冷。

The skin effect of the varactor series resistance is considered and the designing approach of the double-tuned signal circuit discussed as well.

本文叙述了用于卫星通讯地面站的4千兆赫非冷参放的电路设计，考虑了变容二极管串联电阻趋肤效应的影响以及讨论了双调谐信号电路的设计方法。

This paper describes the circuit design of a 4GHz uncooled paramp for satellite communication earth station. The skin effect of the varactor series resistance is considered and the designing approach of the double-tuned signal circuit discussed as well.

本文叙述了用于卫星通讯地面站的4千兆赫非冷参放的电路设计，考虑了变容二极管串联电阻趋肤效应的影响以及讨论了双调谐信号电路的设计方法。

The interface shearing force's differential equations were established based on various principle, in which the energy of strain for concrete flange plate and cold formed steel U section beam and shear connector are calculated.

分别计算混凝土板、剪力连接件、U型钢的应变能，利用变分原理建立冷弯U型钢与混凝土组合梁的界面剪力微分方程。

Scientists suspect that the increase in night-shining clouds may be due to climate change: Even as surface temperatures rise, the upper atmosphere is getting colder due to the buildup of carbon dioxide, creating perfect conditions for cloud formation, experts say.

科学家们怀疑夜光云的增加可能与气候变化有关：当地表温度升高时，上层大气层就会因为二氧化碳的的聚集而变得更冷，从而为形成云提供了理想的条件，专家说道。

Water inside vacuum heat- collection tubes; since the hot medium inside vacuum tubes floats up and cold one goes down due to respective specific gravity, hot and cold mediums convections up and down to cause the heat conduction, furthermore transfer the heat to the related working medium in the heat tubes, the working medium sorbs the potential heat and becomes steam to rise up to the condensing section from the tube heat evaporating section; it emits the heat in condensing section to change again into liquid working medium; it flows back to evaporating section under the gravity action, the emitted heat is transferred into the water inside water tank or tube group by means of the heat-conduction through heat tubes condensing section; it makes the cold water in water tank into hot water in the repeated way.

阳光透过全玻璃真空集热管的外玻璃，照射到涂覆在内玻璃管外表面的选择性吸收涂层上，涂层将太阳的辐射能吸收并转化为热能，通过内玻璃管壁导热，传递给真空集热管内其液态传热介质，由于真空集热管内热的介质因比重小而上浮，冷的介质因比重大而下沉，冷热介质上下对流传热和导热，再通过热管的金属壁导热，将热量传递给热管内其相变工质，工质吸收汽化潜热而变成蒸汽，由热管蒸发段上升到冷凝段，在冷凝段放热冷凝，又变成液态工质，在重力作用下流回蒸发段，所放出的热量通过热管冷凝段金属管壁导热，传递给水箱或联集管内的冷水，周而复始，于是便将水箱内的冷水全部加热成热水。

Cold has two methods: one is the cold-drawing method is to pipe through the tube drawing die, so that tapered pipe, elongation; Another method is to cold-rolling method, it is to Mannesmann brothers invented Meng Hot Rolling Mill of the methods used in cold working.

冷加工有两种方法：一种是冷拔法，就是将钢管通过拔管模拉拔，使钢管逐渐变细、伸长；另一种方法是冷轧法，它是将孟内斯曼兄弟发明的热轧机应用于冷加工中的方法。

Finally, according to market conditions and market products this article paper analyzes the trends in the development of camera technology, and designs a color night vision camera.

最后根据市场情况和市面上产品的情况分析了摄像机技术的发展趋势，并设计了一款彩色夜视摄像机。

Only person height weeds and the fierce looks stone idles were there.

只有半人深的荒草和龇牙咧嘴的神像。