Interlanguage features of learners of English as a second language: from a multi-dimensional perspective

This study examined syntactic features in the interlanguage of learners of English as a second language (ESL) via tasks of conversation and free essay-writing. Data were collected from sixty international students of different first language backgrounds at the Monash University English Language Centre and examined with regard to language style, typological universal and language transfer. Results showed that interlanguage did vary in tandem with style in various syntactic aspects, that the typological universal (the Accessibility Hierarchy) was supported by the data, but that language transfer did not seem to play an important part in the use of topic-comment structure. The findings of the study suggest that examination from a multi-dimensional perspective provides a richer picture of English interlanguage features under investigation

Time-delay signature suppression in a chaotic semiconductor laser by fiber random grating induced distributed feedback

We demonstrate that a semiconductor laser perturbed by the distributed feedback from a fiber random grating can emit light chaotically without the time delay signature. A theoretical model is developed based on the Lang-Kobayashi model in order to numerically explore the chaotic dynamics of the laser diode subjected to the random distributed feedback. It is predicted that the random distributed feedback is superior to the single reflection feedback in suppressing the time-delay signature. In experiments, a massive number of feedbacks with randomly varied time delays induced by a fiber random grating introduce large numbers of external cavity modes into the semiconductor laser, leading to the high dimension of chaotic dynamics and thus the concealment of the time delay signature. The obtained time delay signature with the maximum suppression is 0.0088, which is the smallest to date

Design of a New Random Equivalent Sampling Technology Based on Vernier Method

Random equivalent sampling technology was used to solve the high cost of high speed data acquisition issue. Random equivalent sampling uses multi-sampling technology to convert high-frequency periodic or quasi-periodic signals to low-frequency ones. This technique while is based on the vernier caliper principle is realized by measuring the interval of the trigger point and the first sampling pulse of the next sampling period, the equivalent sampling rate can be up to 10 GSps. It includes the trigger clock generator module, the sampling clock generator module, the equivalent time sampling measurement module and the data storage module. This technique has highly practical value and has been applied to the portable digital Storage oscilloscope

Jiedu Tongluo granules ameliorates post-stroke depression rat model via regulating NMDAR/BDNF signaling pathway

Post-stroke depression (PSD) is one of the most common stroke complications, which seriously affects stroke’s therapeutic effect and brings great pain for patients. The pathological mechanism of PSD has not been revealed. Jiedu Tongluo granules (JDTLG) is an effective traditional Chinese medicine for PSD treatment which is widely used in clinical treatment. JDTLG has a significant therapeutic effect against PSD, but the mechanism is still unclear. The PSD rat model was established by carotid artery embolization combined with chronic sleep deprivation followed by treating with JDTLG. Neurobehavioral and neurofunctional experiments were engaged in studying the neural function of rats. Histomorphology, proteomics, and western blotting researches were performed to investigate the potential molecular mechanisms related to JDTLG therapy. Oral treatment of JDTLG could significantly improve the symptoms of neurological deficit and depression symptoms of PSD rats. Proteomic analysis identified several processes that may involve the regulation of JDTLG on the PSD animal model, including energy metabolism, nervous system, and N-methyl-D-aspartate receptor (NMDAR)/brain-derived neurotrophic factor (BDNF) signal pathway. Our results showed that JDTLG could reduce glutamate (Glu) level and increase gamma-aminobutyric acid (GABA) level via regulating the NMDAR/BDNF pathway, which may play a vital role in the occurrence and development of PSD