We demonstrate that a low repetition rate, all-fiber passively mode-locked Yb-doped fiber laser through nonlinear polarization rotation (NPR). A 1000 m long single-mode fiber (SMF) is inserted into ...the cavity to lower the repetition rate. The laser operates in dissipative soliton resonance (DSR) region and generates stable square pulses with a 202.3 kHz fundamental repetition rate. When the pump power increases, the pulse duration and output power increase linearly, but the peak power keeps unchanged. The maximum pulse duration is 1.25 μs at the pump power of 540 mW. The maximum average power of output pulses is 3.16 mW, which corresponds to single pulse energy of 15.6 nJ.
In this paper, based on the insufficient reliability of the existing wire routing methods for single-pole ground faults in DC distribution networks, the previous method of wire routing based on ...transient quantities is improved with controllable steady-state quantities. A single-ended DC distribution network model with a modular multilevel converter (MMC) as the core is established. By injecting a sinusoidal signal into the MMC, the response waveform to the sinusoidal signal is obtained at the line, and the conclusion that the faulted line is an inductive zero-mode impedance and the non-faulted line is a capacitive zero-mode impedance is obtained, and the faulted line of the DC distribution network can be selected based on this principle. Among the influencing factors of the optimal frequency of the sinusoidal detection signal, the size of the transition resistance and the response speed of the MMC are taken into account, and the amplitude and injection time of the sinusoidal waveform is given on the basis of not affecting the normal operation of the power grid.
Network-on-chip mapping and the configuration of the communication parameters are critical process of the NoC design. They significantly influence the performance, area and power of the NoCs. We take ...the NoC mapping problem and the design of the communication parameters both into account. First, we formalize the problem of NoC mapping. Then we propose an analytical delay model based on wormhole switching. We heuristic map the application model to NoC topology under the constraints of communication delay and obtain the communication parameters automatically. Experiments show that our approach is more comprehensive than previous work and the time consumed by our approach is up to 30% of the reference work.
Depression is a common mental health disorder that can impair normal functions, cause distress, and adversely affect the quality of life. Cognitive impairment is considered one of the characteristics ...of major depression disorders-related dysfunction, and it has received attention in the treatment of major depressive disorders. To investigated the mechanisms underlying depression-induced cognitive disorders, we selected a rodent model of chronic unpredictable mild stress and used liquid chromatography/mass spectrometry-based metabolomics of sera. Behavioral tests, including the sucrose preference test and open field test, revealed that model rats developed depression-like symptoms in the sixth week of the chronic unpredictable mild stress period. Rats of the model group exhibited significant cognitive changes in the Morris water maze test in the tenth week of the period. Tau phosphorylation and decreased levels of postsynaptic density-95 and synaptophysin were observed in the rodent brains by the tenth week. These results suggest that rodents developed cognitive impairment in the tenth week of the period, while serum metabonomic showed that glycerophospholipid metabolism is the most relevant pathway to reveal the mechanism of depression-induced cognitive impairment. The disorders of lipid metabolism caused by the increased cholesterol efflux and reduced reuptake could be one of the mechanisms of depression-induced cognitive disorders. However, the relationship between cholesterol efflux in the brain and elevated serum cholesterol needs further research.
We introduce a novel architecture template modeling for mapping applications on coarse-grained reconfigurable SoC. System level design issues become critical with increasingly complex integrated ...circuits and time-to-market pressure continues relentlessly. Design reuse and early design decision for computation and communication are a "must". Our technique is based on a transaction level architecture template modeling methodology in which computation/communication co-design is performed with the architecture described in an abstract manner. Besides, we use eACOGA algorithm for hw/sw partition. eACOGA uses genetic algorithm to evolve the parameters of ant colony optimization, and makes use of such advantages as positive feedback and efficient convergence to search for optimal partition solutions. Experiments show our approach improves the quality and efficiency of hw/sw partition for reconfigurable SoC, and architecture template enhances system reuse of existing SoC design and achieves exploration speedup well.
System level abstract communication channels are synthesized to actual communication channels through system level communication synthesis after system level partitioning. The synthesized ...communication architecture significantly influences the performance of a system-on-chip (SoC). This paper presents a novel methodology to synthesize crossbarbus-based communication architecture on system level automatically. This methodology first proposes a system level communication delay estimation model. Then it clusters slave modules by Integer Nonlinear Program (INLP) according to the communication delay of the slave modules. Finally it generates the parameters of the crossbar bus to meet the communication delay constraint, which is the difference between the total delay constraint and the compute delay of the SoC. Experiments show that the automatic crossbarbus-bascd communication synthesis methodology results in up to 9.3x faster when compared to the methodologies ever before.
The communication architectures in modern SoCs (system-on-chip) not only impact the performance of SoC considerably, but also consume a large amount of the design cycle. This paper presents a novel ...methodology to synthesize crossbar bus communication architecture on transaction level using genetic algorithm. This methodology first clusters slave modules using a static communication traffic balancing algorithm (SCTBA). Then it uses genetic algorithm (GA) to configure communication parameters and verifies communication delay by transaction level modeling (TLM) and simulation. Finally it outputs the optimal partial crossbar bus topology and communication parameters satisfying the communication delay constraint. The experimental case studies show that our communication synthesis methodology results in up to 5x reduction in synthesis time and 1.5x component savings when compared to the methodologies ever before.
Polymer light-emitting diodes （PLEDs） containing Eu（DBM）3（BrDPPz） （DBM is dibenzoylmethane, and BrDPPz is11- bromo-dipyrido3,2-a：2＇,3＇-cphenazine） doped in a blend of poly（9,9-dioctylfluorene） （PFO） ...and 2-tert-butylphenyl-5- biphenyl-1,3,4-oxadiazole （PBD） as the host matrix were reported. Eu（DBM）3（BrDPPz） exhibited high thermal stability and intense UV-Vis absorption. Narrow-bandwidth red emission at 612 nm with a full width at half-maximum （FWHM） of 14.0 nm was observed from Eu（DBM）3（BrDPPz） in these double-layered PLEDs at dopant concentrations from 1 wt% to 8 wt%. For the PLED containing 1 wt% Eu（DBM）3（BrDPPz）, a maximum luminance of 829 cd/m2 at 153.5 mA/cm2, highest external quantum efficiency of 1,70% at 2.1 mA/cm2 and maximum luminance of 0.74 cd/A at 4.31 mA/cm2 were obtained.
Rheum tanguticum (R. tanguticum) has been widely used for the treatment of inflammatory diseases in clinical. However, limited research exist on the quality evaluation of various R. tanguticum ...locations, which has certain drawbacks. In this study, Fourier-transform infrared spectroscopy (FTIR) and high-performance liquid chromatography (HPLC) were used to comparative study on the chemical contents of R. tanguticum, to clarify the relationship between the chemical contents and the spatial distribution of R. tanguticum. First of all, the FTIR spectra of 18 batches of R. tanguticum were examined. Following the cluster analysis, the FTIR spectra of various production locations differed. To some extent, establishing the double index analysis sequence of common and variation peaks may differentiate distinct production locations of medicinal materials. The HPLC fingerprint of R. tanguticum was constructed to further explore the link between components and their origin. PCA of common peaks of 18 batches of R. tanguticum indicated that R. tanguticum grown in Gannan and Qinghai had a tendency to separate t2, however this trend was not noticeable. Then, OPLS-DA model was established, and the key differential components of R. tanguticum produced in Gannan and Qinghai were discovered to be R16, R37, R46, and R47 (Aloe emodin) (VIP ≥ 1 and P < 0.05). At last, Pearson's test was used to examine the relationship between longitude, latitude, altitude, and composition. Longitude was significantly positively correlated with R28 and R30 (P < 0.05), and a very significantly positively correlated with R35, R36, R37, R46, and R47 (P < 0.01). Latitude was significantly negatively correlated with R34, R35, and R40 (P < 0.05), and extremely significantly negatively correlated with R28, R30, R36, R37, R46, and R47 (P < 0.01). Altitude was significantly positive correlation with R36 and R37 (P < 0.01). The results of our study can provide insights into R. tanguticum quality control and aid in establishing a natural medication traceability system.
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