Species of the genus Orthogonius Macleay from Bhutan and Sikkim are treated.

Application of lubrication protective agent on electrical contact surface of tin and tin alloy deposit

Electroplated Cu-Sn alloy coating is good in decoration and solderability,low in cost,non-toxic,not irritable,etc.

The method use SCR continuous casting-rolling system to make conducting wire(Cu-Sn alloy rod) for railway application was introduced.

The paper describes the process ofφ20mm Cu-Sn alloy wirebar production in continuous casting and roiling process,analyzes the impact of the wirebar s oxygen and tin content distribution on production stability, describes the cold-forming process of contact wire manufacturing by drawing machine,and studies and compares anti-drawing strength and extension capability of it.

The performances of lead-free plating and Sn-Pb alloy plating were contrasted, and the process formulation and operation condition of tin and tin based alloy plating and electroless plating were presented.

Gas atomizing process has been used for developing SMT purposed raw material tin based alloy soldering powder of free cleaning type soldering paste,the alloy composition and impurity component contents of which have reached US QQ SS 571E and JAP JIS Z 3282A grade standards with oxide contents meeting the standard of US Multicore Co.

Determination of trace elements in steel, nickel-base alloy and zircaloy using time of flight inductively coupled plasma mass spectrometry;