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The gold content in white karat gold alloy samples is determined by the cupellation method, and the effect on the testing results of gold content with the test portion weight of the proof gold and samples, the variety of cupels, the additive amount of copper and silver is studied. At the same time, the accuracy of the results determined by cupellation method is also validated by using ICP.

运用火试金法测定含Pd白色K金合金首饰的含Au量，考察了降低标准Au与样品的称样量、灰皿的种类、加入适量的Cu与Ag对其含Au量分析结果的影响，并应用ICP验证了其结果的准确性。

The progress in research on corrosion inhibition of cupronickel alloy is reviewed in detail.

综述了近年来有关铜镍合金的研究进展，分析归纳了影响铜镍合金耐蚀性能的一系列影响因素。

A new method was proposed by imposing a rotating electromagnetic field during horizontal continuous casting of thin-walled cupronickel tube billets. The effects of electromagnetic field on the surface quality, solidification structure and mechanical properties were investigated experimentally by use of BFe10-1-1 alloy.

摘 要：为获得高质量的薄壁白铜管坯，提出了在水平连铸过程中施加旋转电磁场的管坯连铸新方法，并采用BFe10-1-1合金进行实验，考察了电磁场对白铜管坯表面质量、凝固组织和力学性能的影响。

On the other hand,the cupronickel welded joint formed by using cupronickel rod had better corrosion resistance in seawater due to the microstructure of Cu-Ni-Zn ternary alloy solid solution with single-phase structure of α.

海水系统主要采用铜及铜合金制造，其优点是耐海水腐蚀和抗污损能力强，维修次数少，全寿命成本低，可靠性高，因此在船舶等行业得到了日益广泛的应用[1~6]。

The corrosion rate, corrosive wear rate and polarization curves of aluminium brass and cupronickel alloy were determined in 3.5%NaCl and 3.5%NaCl+NH3(NH4+)solutions, the wear tracks of copper alloys were observed by SEM, the specific energy of the surface layer after corrosion was also measured by single pendulum scratching test.

本文通过测定HA177－2，BFe30－1－1在3.5％NaCl和3.5％NaCl＋NH3（NH4+）溶液中的腐蚀速率、腐蚀磨损率和电化学行为以及观测腐蚀磨损后铜合金的微观形貌，研究了腐蚀后样品的表层性能。

Effects of pulse electric current on directional solidification structure of Al-4.5Cu alloy have been observed.

研究了脉冲电流对Al-4.5Cu合金定向凝固过程及组织的影响。

The influence of high density pulse electric current on the solidification structure of hypereutectic Al-19Si alloy was studied.

摘 要：研究了高密度脉冲电流对过共晶Al-19Si合金凝固组织的影响。

The basic reason is that the pulse pressure, produced by the pulse current, affects the nucleation and growth of the alloy.

其主要原因是脉冲电流产生的脉冲压力对晶核的形成和长大产生了影响。

Like the cylinder block, the head is made from either cast iron or aluminum alloy.

像气缸体一样，气缸盖是由铸铁或者铝合金制成。

On this basis, the solidification behavior of decagonal quasicrystal in the undercooled Al72Ni12Co16 alloy melt, such as nucleation and growth mechanism, was systematically investigated.

本文的主要研究内容及获得的结论如下：(1)采用惰性形核涂层技术和循环过热的方法，使Al_(72)Ni_(12)Co_(16)合金熔体最大获得了180K的高过冷度。

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。