Purpose
The purpose of this paper is to provide the high-pass (HP) negative group delay (NGD) circuit based (RL) network. Synthesis and experimental investigation of HP-NGD circuit are developed.
Design/methodology/approach
The research work methodology is organized in three phases. The definition of the HP-NGD ideal specifications is introduced. The synthesis method allowing to determine the RL elements is developed. The validation results are discussed with comparison between the calculated model, simulation and measurement.
Findings
This paper shows a validation of the HP-NGD theory with responses confirming NGD optimal frequency, value and attenuation of about (9 kHz, −1.12 µs, −1.64 dB) and (21 kHz, −0.92 µs, −4.81 dB) are measured. The tested circuits have experimented NGD cut-off frequencies around 5 and 11.7 kHz.
Research limitations/implications
The validity of the HP-NGD topology depends on the coil self-inductance resonance. The HP-NGD effect is susceptible to be penalized by the parasitic elements of the self.
Practical implications
The NGD circuit is usefully exploited in the electronic and communication system to reduce the undesired delay effect context. The NGD can be used to compensate the delay in any electronic devices and system.
Social implications
Applications based on the NGD technology will be helpful in the communication, transportation and security research fields by reducing the delay inherent to any electronic circuit.
Originality/value
The originality of the paper concerns the synthesis formulations of the RL elements in function of the expected HP-NGD optimal frequency, value and attenuation. In addition, an original measurement technique of HP-NGD is also introduced.
Up to now, most researchers have been paying attention to the negative transfer of mother tongue to second language writing. Few studies, if any, have touched upon the positive transfer. Therefore, the purpose of this study is to investigate the positive transfer of Chinese to 26 first-year university students' English writing holistically and segmentally in the use of words, grammar, coherence, and content and organization. The result of the Pearson correlation coefficient turned out to be 0.43 at the 5% significance level, indicating a positive relationship between the Chinese writing and the English writing. The questionnaires have also confirmed the result of the correlation analysis. In particular, the positive transfer of Chinese seems to be more apparent in the content and organization of the English writing, followed by coherence and use of words. Thus, it can be concluded that the positive transfer of mother tongue can facilitate English writing.
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