可弯转及灵活定向的短路接地线操作杆的研制及应用

便携式短路接地线操作杆是配网施工作业中一种应用广泛的安全工器具,目前使用的便携式短路接地线操作杆存在操作杆过长以及线夹开口难以满足多角度操作等问题,难于适应不同应用场景中的操作以及存在操作安全隐患。研制一种方便弯转、线夹定向灵活以及拆卸方便的便携螺旋式短路接地线操作杆,可以解决目前使用的便携式短路接地线操作杆存在的问题,具有推广应用价值。

From the Manipulation of Literary Translation to the Manipulation of Literary Creation： A Case Study

Manipulation always means a kind of extraordinary alteration for some purposes. All translation implies a degree of manipulation of the source text for a certain purpose. Liang Shih-chiu＇s literary translation serves for his literary creation which aims to promote colloquialism and to construct New Literature in the May Fourth Movement. Literary translation is the foundation of literary creation, or rather, its important strategy. The paper, from the perspective of Manipulation Theory, analyzes the purpose and strategy of Liang Shih-chiu＇s literary translation and explores the influence of his literary translation upon his literary creation in terms of ideology, poetics and patronage.

Realization of Tip Tilting By 8-Step Line Tilting

By direct calculation of rotation matrices of SO(3),we show how certain specific sequence of eight consecutiverotations of digital angles can yield a tilting of a facet mirror.We also design a detailed program specifically to tiltan array of mirrors from planar orientation to the required focusing orientation.We describe how to use the 8-step torealize the focusing of the mirror array.We have found,in our designed program,an important feature of row-sharingduring the rotations for the columns and similarly the column-sharing during the rotations for the row.This feature cansave a lot of operating time during the actual realization of the mechanical movements.

A new digital transmitter based on delta sigma modulator with bus-splitting

A new digital transmitter based on delta sigma modulator( DSM) with bus-splitting is presented in this paper. The second order low pass error-feedback delta sigma modulator( EF-DSM) is focused. The signal to noise ratio( SNR) of the EF-DSM is derived for different bus-splitting bits.Following the EF-DSM,a multi-bit digital up mixer is used for carrier frequency transform. In order to validate the theory of bus-splitting,two types of transmitters are implemented on FPGA for comparison,in which one is with non-bus-splitting and the other is with bus-splitting. The FPGA implemented transmitter with bus-splitting promotes the maximum operation speed by 39%,and reduces hardware consumptions more than 16%. Both single tone and orthogonal frequency division multiplexing( OFDM) signal source are used to evaluate the proposed transmitter.

R32脉动热管传热性能实验研究

为探索高效传热的脉动热管工质,实验研究了R32脉动热管在充液率30%~70%,操作角度90°、45°、0°,加热功率10 W~250 W,管径为1 mm、2 mm时的传热性能。结果表明,低充液率下脉动热的热阻最小;操作角度在90°~45°范围内时,操作角度对传热性能影响较小,操作角度为0°时无法启动和运行;随着加热功率的增加,充液率低于50%时脉动热管的热阻先减小后增大,充液率高于50%时热阻先减小后稳定不变;管径为2 mm的脉动热管的传热性能最好,热阻最小为0.12℃·W^(-1)。