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An aerosol spray device which is capable of imparting a unipolar charge by double layer charging and charge separation to liquid droplets of a composition sprayed therefrom has a spraying head in the form of an insert in an actuator, the spraying head having a bore through which liquid is expelled having an outlet, preferably with a tortuous periphery, having an L/a ratio of at least 8 (preferably at least 10) where L is the length of the periphery defining the bore outlet in mm and a is the cross-sectional area of the bore outlet in mm2 and the apparatus being constructed such that the droplets are expelled from the spraying head at a flow ratio of at least 0.4 (preferably at least 0.5) grams per second and have a charge to mass ratio of at least +/-1x10-4 C/kg.

本发明还提供了一种喷射装置，它能够通过双层充电和电荷分离而向要喷出的组合物液滴施加单一极性的电荷，该喷射装置具有一个喷头，该喷头制成为致动器中的插入件的形式，喷头具有一个孔腔，液体能够通过该孔腔从装置中排出，该孔腔具有一出口，该出口最好具有曲线周边，并且L/a比率至少为8，其中L是以mm为单位的确定孔腔出口的周长，a是以mm2为单位的孔腔出口的横截面积，该装置构造成使得液滴在至少每秒0.5克的流动速率以及具有至少＋／－1×100C/kg的电荷／质量比的状态下从喷头排出。

Sequence structure of a cloned gene is an important factor to determine its expression level in E.coli. In this paper, we studied the expression of a fragement of HIV-1 gp120 gene and a fragement of choler toxin A subunit gene in E.coli using a new expression strategyoptimizing the gene sequence as a whole.

外源基因的序列结构是影响外源基因在大肠杆菌中表达的重要因素，我们采用基于"外源基因全序列结构优化"的新的表达策略，研究了HIV-1 gp120-801和霍乱毒素A亚单位(CTA-246)基因在大肠杆菌中的表达情况。

If there is a negative number in an addition, we still require commutative law,and then+a=a+=0 a=-.

当加法有负数参加时我们仍然规定必须满足交换律，于是+a=a+=0 a=-。

Theorem4.5 Let A be a compact normal operator, is an isolated point in Prop4.13 Let A be a compact normal operator, AO is an isolated point in a.

i20 其中（入，…＼＊为一川的所有的互不相同的孤立点。命题4.13设A是紧正常算子，人。一0是a…）的＄良立点。

The method comprises allocating a reserved area within a linear addressing space of the disc, contiguously recording the A/V information signals in a video recording area located succeeding the reserved area, recording corresponding management data in a temporary overview space succeeding the video recording area, generating a mapping table for mapping the recorded management data to address locations in the reserved area and recording the mapping table in the temporary overview space.

该方法包含：在线性寻址空间中分配保留区域，将A/V信息信号连续地记录在保留区域之后的视频记录区域中，将相应的管理数据记录在视频记录区域之后的临时概观空间中，生成用于将所记录的管理数据映射到保留区域中的地址位置的映射表，将该映射表记录在临时概观空间中。

The radius of convergence of a power series ''f'' centered on a point '' a '' is equal to the distance from ''a'' to the nearest point where '' f '' cannot be defined in a way that makes it holomorphic.

一个中心为'' a ''的幂级数''f''的收敛半径'' R ''等于''a''与离'' a ''最近的使得函数不能用幂级数方式定义的点的距离。

Derivatives also create a daisy-chain risk that is akin to the risk run by insurers or reinsurers that lay off much of their business with others. In both cases, huge receivables from many counterparties tend to build up over time.(At Gen Re Securities, we still have $6.5 billion of receivables, though we've been in a liquidation mode for nearly a year.) A participant may see himself as prudent, believing his large credit exposures to be diversified and therefore not dangerous. Under certain circumstances, though, an exogenous event that causes the receivable from Company A to go bad will also affect those from Companies B through Z. History teaches us that a crisis often causes problems to correlate in a manner undreamed of in more tranquil times.

衍生性金融商品交易也有可能造成骨牌效应的风险，这是因为许多保险业及再保业者习惯将风险分散给其它保险公司，在这类的情况下，钜额的应收款项将随着交易对象的日趋复杂而持续累积，(以通用再保证券来说，虽然已经经过将近一年的清算期，目前仍有高达65亿美元的应收款项流通在外)，交易的一方或许对于自己相当有信心，认为其钜额的信用风险已经经过适度的分散，因此不会发生任何危险，只有等到某种特殊状况下，一个外部事件导致 A 公司的应收帐款发生问题，从而影响 B 公司，乃至于一路到 Z 公司，历史教训告诉我们危机的发生往往是我们在太平盛世时所梦想不到一连串问题串连所导致的。

The need to meet this demand can then throw the company into a liquidity crisis that may, in some cases, trigger still more downgrades. It all becomes a spiral that can lead to a corporate meltdown. Derivatives also create a daisy-chain risk that is akin to the risk run by insurers or reinsurers that lay off much of their business with others. In both cases, huge receivables from many counterparties tend to build up over time.(At Gen Re Securities, we still have $6.5 billion of receivables, though we've been in a liquidation mode for nearly a year.) A participant may see himself as prudent, believing his large credit exposures to be diversified and therefore not dangerous. Under certain circumstances, though, an exogenous event that causes the receivable from Company A to go bad will also affect those from Companies B through Z. History teaches us that a crisis often causes problems to correlate in a manner undreamed of in more tranquil times.

衍生性金融商品交易也有可能造成骨牌效应的风险，这是因为许多保险业及再保业者习惯将风险分散给其它保险公司，在这类的情况下，钜额的应收款项将随着交易对象的日趋复杂而持续累积，(以通用再保证券来说，虽然已经经过将近一年的清算期，目前仍有高达 65 亿美元的应收款项流通在外)，交易的一方或许对于自己相当有信心，认为其钜额的信用风险已经经过适度的分散，因此不会发生任何危险，只有等到某种特殊状况下，一个外部事件导致 A 公司的应收帐款发生问题，从而影响 B 公司，乃至于一路到 Z 公司，历史教训告诉我们危机的发生往往是我们在太平盛世时所梦想不到一连串问题串连所导致的。

They can also be used for such materials as following:making planes and spacecrafts,screening high-speed neutron reactors,a superconductor in electrical appliance industry,The vanadium compound can be used as a caterlyzer in sulphuric acid industry,a mixture of ethylene and propylene in symthetic rubber and a desulfurizer in oil-refinery ,an oxidizer in making nylon,pesticide,polyvinyl chloride,a non-propylene decarbonizer in chemical fertilizer industry,amilioration of A.D.A.non poisonkous desulpurtion.

我公司生产的五氧化二钒99.5级，99级，98级以及偏钒酸铵，用途广泛，它可制取金属钒和钒合金，用于钢铁冶炼\机械，飞机以及宇宙飞船制造等行业，快中子反应堆的屏蔽材料和电子工业的超导材料，钒化物应用于硫酸工业催化剂，合成橡胶的乙烯和丙烯交联，石油精炼中的脱硫，尼龙，农药，塑料聚氯乙烯制造的氧化，化肥工业的笨非尔无毒脱碳，改良A，D，A法无毒脱硫，钒化物还因其色泽艳丽而作为颜料应用到玻璃，陶瓷，医药等行业，钒酸盐也是印染业良好的媒染剂。

A ring of integers derived from the set of all integers according to the following rule: Let N be an integer greater than 1, and A and B be two other integers; if N is a factor of A·B, then A is said to be congruent to a B modulo-N.

由全体整数的集合按下列规则产生的整数环：设N为大于1的整数，A和B是两个其它整数，若N是A·B的因子，则称A与B是模N的同余式。

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。