Mid-IR Multiwavelength Difference Frequency Generation Based on Fiber Lasers

A mid-IR multiwavelength difference frequency generation (DFG) laser source with fiber laser fundamental lights is demonstrated by using the dispersion property of PPLN to broaden the quasi-phase-matching (QPM) acceptance bandwidth (BW). Our results show that the QPM BW for the pump YDFL is much larger than that for the signal EDFL. Using a multiwavelength YDFL and a single-wavelength EDFL as the pump and the signal lights, the DFG laser source can simultaneously emit 14 mid-IR wavelengths with the spacing of 14nm at a fixed PPLN temperature. Moreover, mid-IR multiwavelength lasing lines can be synchronously tuned between 3.28 and 3.47μm

How Do Price Promotion and Donation Promotion affect Consumers\u27 Impulsive Buying Behavior?: Based on Face Awareness and Regulatory Focus to the Interaction of Promotion Patterns

This study aims to investigate the impact of price promotion and donation promotion on consumers\u27 impulsive buying behavior, and analyze the interaction effect of face awareness and regulatory focus in the above effects by using the situational simulation and questionnaire methods. According to the results, the price promotion can stimulate consumers to produce impulsive buying behavior more than donation promotion. Through the two-factor analysis of variance to test the interaction effect, it is concluded that in the situation of price promotion, there is no significant difference between the likelihood of impulsive buying behavior between high face awareness consumers and low face awareness consumers; However, in the situation of donation promotion, high face awareness consumers are more likely to produce impulsive buying behavior than low face awareness consumers; And whether in the situation of price promotion, or in the situation of donation promotion, prevention focus consumers are more likely to produce impulsive buying behavior than promotion focus consumers. The conclusions of this study are of reference significance for revealing the factors that affect consumers\u27 impulsive buying behavior and helping companies to formulate promotional strategies

Type 1 Diabetes Mellitus and Cognitive Impairments: A Systematic Review

Type 1 diabetes mellitus (T1DM) is a major subtype of diabetes and is usually diagnosed at a young age with insulin deficiency. The life expectancy of T1DM patients has increased substantially in comparison with that three decades ago due to the availability of exogenous insulin, though it is still shorter than that of healthy people. However, the relation remains unclear between T1DM and dementia as an aging-related disease. We conducted a systematic review of existing literature on T1DM and cognition impairments by carrying out searches in electronic databases Medline, EMBASE, and Google Scholar. We restricted our review to studies involving only human subjects and excluded studies on type 2 diabetes mellitus or non-classified diabetes. A meta-analysis was first performed on the relationship between T1DM and cognitive changes in youths and adults respectively. Then the review focused on the cognitive complications of T1DM and their relation with the characteristics of T1DM, glycemic control, diabetic complications, comorbidities, and others. First, age at onset, disease duration, and glycemic dysregulation were delineated for their association with cognitive changes. Then diabetic ketoacidosis, angiopathy, and neuropathy were examined as diabetic complications for their involvement in cognitive impairments. Lastly, body mass index and blood pressure were discussed for their relations with the cognitive changes. Future studies are needed to elucidate the pathogenesis of T1DM-related cognitive impairments or dementia