The thermal stress of the quartz oscillator module packaging is investigated using distal-im-age correlation method(DICM),and the experimental results are given.Under the quartz oscillator modulepackaging,the quartz o...The thermal stress of the quartz oscillator module packaging is investigated using distal-im-age correlation method(DICM),and the experimental results are given.Under the quartz oscillator modulepackaging,the quartz oscillator and the Fe-Sn-Cu alloy frame are joined together with the electroconductiveadhesive(PI),and the electroconductive adhesive needs to be cured twice at 150℃ and 275℃ respective-ly.As the quartz oscillator and the Fe-Sn-Cu alloy frame have a distinct difference in both thermal expansioncoefficients and mechanical properties and in process of packaging temperature rises or drops,the thermalstress is yielded easily.While temperalure drops,the normal stress at the quartz oscillator edge is a tensilestress,which can make the quartz oscillator fracture.展开更多
Water-preserved mining is one of the important parts of the ‘Green Mining’ technological system. The purpose of wa-ter-preserved mining is to prevent water from bursting out in coal mines and thus to protect water r...Water-preserved mining is one of the important parts of the ‘Green Mining’ technological system. The purpose of wa-ter-preserved mining is to prevent water from bursting out in coal mines and thus to protect water resources. The principle of wa-ter-resisting key strata (WKS) is proposed to establish a model capable of guiding and developing water-preserved mining technol-ogy. The experimental model of the WKS is constructed following requirements of the Data Image Correlative Method (DICM). Five experimental schemes are designed according to different combined patterns of the WKS. The water-resisting performance of the WKS is analyzed from observation of structural stability. All of them provide referential value for water-preserved mining.展开更多
基金the Natural Science Foundation of Tianjin (013605211)
文摘The thermal stress of the quartz oscillator module packaging is investigated using distal-im-age correlation method(DICM),and the experimental results are given.Under the quartz oscillator modulepackaging,the quartz oscillator and the Fe-Sn-Cu alloy frame are joined together with the electroconductiveadhesive(PI),and the electroconductive adhesive needs to be cured twice at 150℃ and 275℃ respective-ly.As the quartz oscillator and the Fe-Sn-Cu alloy frame have a distinct difference in both thermal expansioncoefficients and mechanical properties and in process of packaging temperature rises or drops,the thermalstress is yielded easily.While temperalure drops,the normal stress at the quartz oscillator edge is a tensilestress,which can make the quartz oscillator fracture.
基金Projects 2007CB209400 supported by the National Basic Research Program of China (973)50574090 and 50634050 by the National Natural Science Foundation of China
文摘Water-preserved mining is one of the important parts of the ‘Green Mining’ technological system. The purpose of wa-ter-preserved mining is to prevent water from bursting out in coal mines and thus to protect water resources. The principle of wa-ter-resisting key strata (WKS) is proposed to establish a model capable of guiding and developing water-preserved mining technol-ogy. The experimental model of the WKS is constructed following requirements of the Data Image Correlative Method (DICM). Five experimental schemes are designed according to different combined patterns of the WKS. The water-resisting performance of the WKS is analyzed from observation of structural stability. All of them provide referential value for water-preserved mining.
