摘要:

Measurements of bending induced losses in matched‐cladding and depressed‐cladding single‐mode fibers with similar 1300‐nm mode field diameters and cutoff wavelengths are reported. It is found that the depressed‐cladding fiber demonstrates better microbending and macrobending performances than the matched‐cladding fiber.

ISSN:0253-3839    

DOI:10.1080/02533839.1993.9677482

出版商:Taylor & Francis Group    

年代:1993

数据来源: Taylor

摘要:

This paper presents an intelligent digital filter synthesis system which consists of a user‐friendly graphic I/O interface, a synthesis program designing filter coefficients, an intelligent hardware generation system and a simulator including time and frequency domain simulation. Users need only to specify the filter type, filter specifications, sampling rate requirement and some parameters through the graphic interface. The filter response and the simulation results can be immediately shown on the screen. The graphic interface is based on the X Window System and therefore provides a network‐transparent and vendor‐independent operating environment for the system. The synthesis system is targeted for two main types of digital filter: FIR and IIR. An automatic partition algorithm on FIR is developed to meet the user's sampling rate requirement. The optimal cascade architecture of biquad‐based IIR with programmable coefficients is also derived. The final circuit designs under economic bitwidth are generated by the GDT system and further layouts can be generated.

ISSN:0253-3839    

DOI:10.1080/02533839.1993.9677483

出版商:Taylor & Francis Group    

年代:1993

数据来源: Taylor

摘要:

The free vibration analysis of orthotropic composite laminates is investigated by using the partial hybrid plate element. The Hellinger‐Reissner principle is modified by adding kinetic energy. The through thickness effect is properly predicted since the transverse shear stress fields are assumed in the hybrid stress version. The natural frequencies are therefore accurately predicted. Apparently, the present study is more accurate than the displacement‐based higher‐order plate element.

ISSN:0253-3839    

DOI:10.1080/02533839.1993.9677484

出版商:Taylor & Francis Group    

年代:1993

数据来源: Taylor

ISSN:0253-3839    

DOI:10.1080/02533839.1993.9677470

出版商:Taylor & Francis Group    

年代:1993

数据来源: Taylor