The symmetric,positive semidefinite,and positive definite real solutions of the matrix equation XA=YAD from an inverse problem of vibration theory are considered.When D=T the necessary and sufficient conditions fo...The symmetric,positive semidefinite,and positive definite real solutions of the matrix equation XA=YAD from an inverse problem of vibration theory are considered.When D=T the necessary and sufficient conditions for the existence of such solutions and their general forms are derived.展开更多
XML is an important technology for Internet-based data exchange with far reaching capabilities be-yond for just data exchange. The paper describes the first results of a project that aims to explore the applicabil-ity...XML is an important technology for Internet-based data exchange with far reaching capabilities be-yond for just data exchange. The paper describes the first results of a project that aims to explore the applicabil-ity of XML technology for web-based software engineering with the emphasis on collaborative software testing in-volving the use of statechart. The paper presents the approach of building the statechart schema with XML Sche-ma. It also describes the use of the schema in a web-based collaborative software testing CASE environment.展开更多
A novel fiber optic liquid level sensor based on laser radar (ladar) is reported here. Using the perfect technique of ladar in which the phase of amplitude modulated light wave reflected from the liquid surface is com...A novel fiber optic liquid level sensor based on laser radar (ladar) is reported here. Using the perfect technique of ladar in which the phase of amplitude modulated light wave reflected from the liquid surface is compared with that of original modulation signal, the distance can be measured precisely. A special symmetric compensating coaxial optical system is proposed to eliminate many adverse effects. It realized the one-time electronic-free optical measurement on a simulated oil tank and achieves an accuracy of 0.3%, within a temperature range of -10 ℃～+40 ℃ over a measuring of 0～10 m.展开更多
文摘The symmetric,positive semidefinite,and positive definite real solutions of the matrix equation XA=YAD from an inverse problem of vibration theory are considered.When D=T the necessary and sufficient conditions for the existence of such solutions and their general forms are derived.
基金Sponsored by Guangxi Science Research Foundation (Grant No. 0141046)
文摘XML is an important technology for Internet-based data exchange with far reaching capabilities be-yond for just data exchange. The paper describes the first results of a project that aims to explore the applicabil-ity of XML technology for web-based software engineering with the emphasis on collaborative software testing in-volving the use of statechart. The paper presents the approach of building the statechart schema with XML Sche-ma. It also describes the use of the schema in a web-based collaborative software testing CASE environment.
文摘A novel fiber optic liquid level sensor based on laser radar (ladar) is reported here. Using the perfect technique of ladar in which the phase of amplitude modulated light wave reflected from the liquid surface is compared with that of original modulation signal, the distance can be measured precisely. A special symmetric compensating coaxial optical system is proposed to eliminate many adverse effects. It realized the one-time electronic-free optical measurement on a simulated oil tank and achieves an accuracy of 0.3%, within a temperature range of -10 ℃～+40 ℃ over a measuring of 0～10 m.
