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Infrasound (0.0001-20Hz) is acoustic energy with characters of little attenuation and long distance during radiation, inaudibility, diffraction and resonance in some parameters.

次声波是频率为0.0001Hz-20Hz的声波,具有传播衰减小、传播距离远、易于衍射、一般听不到、达到一定参数可引发共振等特点。

They must be read by computers or anagogic equipment. They are relative small and light but they can be deposited a vast of information and the information can last long. Multimedia and interactive internet publications can be retrieved conveniently. The information of internet publications can be refreshed, edited, transferred, communicated by Internet quickly, internet publications possess access speeds, retrieval accuracy, interactivity, and flexibility.

网络出版物具有信息量大,使用方便,可对信息进行各种处理,检索快速便捷,图文声像并茂,交互性强,省去了印刷、装订、储运等环节,降低了生产成本,出版周期短,信息通过计算机网络高速传播,信息获取快、传播快、更新快等特性;并且具有计算机检索功能、超文本功能,使之成为一种具有强大生命力的大众文化传播媒体,给人类社会带来了深刻的影响。

Thus clean water supplies and the correct disposal of faeces could prevent the spread of cholera, control of anopheline mosquitos could reduce malaria transmission, and immunization could protect young children against measles.

由此可见,供应清洁水和正确处理粪便可防止霍乱的传播,控制按蚊可减少疟疾的传播,免疫接种可保护儿童免遭麻疹感染。

The main characteristics include: the quiet Sun corona has a rapid response to the flare heating, within 2 second the corona temperature increases nearly one order of magnitude, but later such increase becomes very slowly; the downward velocity at early stage of impulsive phase is too small to be negnected; chromospheric evaporation made by conduction shows some intensely, the maximum evaporated velocity may be as large as 1000 km/s; the chromospheric condensation appears just when the chromospheric evaporation takes place and its place always coincide with that of transition region in the early stage; the maximum of chromospheric condensation occurs also in the early stage of impulsive phase, at which the density in condensation may be larger two order of magnitude than that of surround and the downward velocity may be as large as 100 km/s; after the maximum of chromospheric condensation, its strongth decreases gradually but its width becomes greater with time and have a tendency to transport into deep chromosphere; the front of chromospheric condensation heats atmosphere obviously and the temperature in the chromospheric condensation is higher than the original case; the downware velocity of transition region may be greater than 100 km/s at the early stage; when the evaporated material collide at the top of loop, the densityand the presure there increase rapidly, which result in the formation of a shock wave; and so on.

在改善色球辐射损失和精确分辨过渡区的基础上,通过联立求解连续性方程、动量方程和能量方程,构造了一维磁限制性耀斑环在热沉积作用下的大气动力学模型,获得了耀斑热模型下脉冲相早期较为细致的大气演化理论图象,其主要特征是:耀斑对宁静日冕的加热相当迅速,仅2秒钟日冕温度增加即达一个量级,之后日冕温度增加缓慢;脉冲相早期日冕向下速度很小,几乎可以忽略,热传导驱动色球蒸发,其过程较为激烈,蒸发极大速度可达到1000km/s;色球压缩区与色球蒸发几乎同时形成,且在早期其位置总是与过渡区位置重合;色球压缩极大发生在脉冲相早期,其时密度可高于周围约2个量级,向下速度可超过100km/s;色球压缩极大后,其强度逐渐减弱,但宽度明显增大,且渐渐脱离过渡区往色球传播;压缩区内物质温度要高于原先的大气温度;过渡区下降在脉冲相早期相当迅速,可超过100km/s;当蒸发物质在环顶高速相碰时,环顶的密度、压力迅速增大,且温度也有所增加,导致形成激波,其波面以每秒上百公里的速度自环顶向下传播;在脉冲相前期,日冕软x辐射对色球的加热作用可以忽略;等。

We have performed systematical studies on intrauterine transmission of hepatitis B virus and our studies suggested that HBV may occur through progressive infection of different placental layers until the virus reaches the fetoplacental circulation, which is the named "transplacental cellular traffic" except through placental tears with transfusion of infected maternal blood into the fetal circulation, which is the named "hematogenous transmission".

我室近年来对HBV宫内传播进行了系列研究,发现了胎盘在宫内传播中的作用,并提出了HBV宫内传播机制的假设:除血源性途径外,还可通过HBV在胎盘组织内的&细胞传递&途径,即HBV可以从母体蜕膜细胞通过&逐层转移&至胎儿绒毛毛细血管内皮细胞,导致胎儿感染。

Perspective, in all its variations and permutations (e.g., external / internal, divine / human, objective / subjective, impersonal / personal, public / private, singular / multiple, sincere / ironic, omniscient / solipsistic, totalizing / partial), operates as one of the central framing techniques for orienting narrative, inasmuch as it limits what information is available and possible to know at any particular moment as well as how information gets divulged over time.

各种变换的视角(例如:外在内在,神圣人类,客观主观,非个人的个人的,公开私有,单一多数,真诚讽刺,全知唯我,整体部分),为重要的主导叙事的架构技巧之一,在其可限的范围内,讯息的取得、得知的特定契机以及在时间递演下,讯息是如何传播的。

The properties of blast loading are that it is highly impulsive, exhibiting high-pressures but lasting for a very short duration. The propagation process of shock wave produced in steel-concrete composite beams subjected to blast loading is very short. And there is only small deformation for the beam during the time of the propagation process of wave.

由于爆炸荷载作用时间短、超压峰值大等特点,当爆炸荷载作用于钢-混凝土组合梁上时,将在梁内产生冲击波,冲击波在钢-混凝土组合梁内的传播过程极短,并且在冲击波的传播过程中梁的变形很小,因此,可将冲击波在梁内的传播过程进行独立分析。

Using timeline and crossmap techniques,the paper analyzes the reasons of science communication's development in three aspects of the internal structural changes,knowledge sources and exterior related specialties' interplays.

科学传播研究是社会现实发展的一种回应,通过对科学传播研究领域的文献计量和可视化分析,让科学传播理论研究与社会现实形成良性互动,为国家科学政策的制定提供借鉴。

The results are verified from deep to extremely shallow water conditions. The shoaling waves, standing waves, 3D disturbance waves, tidal waves and solitude waves are simulated and verified,and waves over an underwater bar,the diffraction near single breakwater, breakwater gap, offshore breakwater, Breakhoff experiment are taken into account in this model. Furthermore, the wave harbor resonance under special topography, and "Bragg" resonance are simulated. The wave refraction problem under current fields,the nonlinear wave refraction-diffraction under "Arthur" current field, and the wave propagation under slowly varying current field are studied. The favorable calibrations show the model's feasibility in dealing with the wave nonlinearity and simulation in both deep and shallow water.

论文对深水至极浅水非线性波进行了较全面的验证,计算模拟了波浪浅化、立波、三维干涉波、潮波、孤立波以及波浪越过潜堤、单突堤绕射、双突堤绕射、岛式堤、Berkhoff实验和多连通水域波浪传播等问题,还对特殊地形条件下波浪发生港湾共振、布拉格共振进行了仿真;论文研究了水流中波浪传播折射变形问题,Arthur流场上非线性折射-绕射、水位缓变的转向潮流中波浪传播等缓变水流中波浪问题,各类问题的较好解决验证和表明了本文模式与方法具有适用于深浅水的可计算性与非线性。

Spread path mainly for the breath way spread, can also pass to get in touch with an infection of pig or its excrement, the surroundings polluting environment or spirit dissolve gum etc.

传播途径主要为呼吸道传播,也可通过接触感染的猪或其粪便、周围污染的环境或气溶胶等途径传播。

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推荐网络例句

With Death guitarist Schuldiner adopting vocal duties, the band made a major impact on the scene.

随着死亡的吉他手Schuldiner接受主唱的职务,乐队在现实中树立了重要的影响。

But he could still end up breakfasting on Swiss-government issue muesli because all six are accused of nicking around 45 million pounds they should have paid to FIFA.

不过他最后仍有可能沦为瑞士政府&议事餐桌&上的一道早餐,因为这所有六个人都被指控把本应支付给国际足联的大约4500万英镑骗了个精光。

Closes the eye, the deep breathing, all no longer are the dreams as if......

关闭眼睛,深呼吸,一切不再是梦想,犹如。。。。。。