Subjects: Medicine, Pharmacy >> Preventive Medicine and Hygienics submitted time 2024-02-19 Cooperative journals: 《中国全科医学》
Abstract： Heart failure patients are prone to depression，and interact with each other，leading to lower quality of life and poor prognosis of patients. As the largest microecosystem in the human body，changes in the composition，structure and function of the gut microbiota are closely related to the physiological and pathological states of the host. Currently，the “gut heart/brain axis” has been used to explain the link between gut microbiota，cardiovascular diseases，and mood states，which is an important comorbid basis for heart failure and depression. In this paper，we reviewed the mechanisms of gut microbiota，metabolites，and vagus nerve in the development of heart failure and depression，and propose that mediterranean diet，probiotics，and microbiota transplantation have the potential to improve the “microbiota-gut-heart/brain axis”，providing a new perspective for the treatment of heart failure patients comorbid with depression.
Subjects: Geosciences >> Other Disciplines of Geosciences submitted time 2019-09-10 Cooperative journals: 《干旱区研究》
Abstract：以“奎屯—独山子—乌苏”区域重点城市奎屯为研究区域，利用2013—2015年O3、VOCs、NOx监测数据，探讨奎屯市大气O3与VOCs、NOx之间的关系。结果显示：2013—2015年依次出现33 d、14 d、10 d O3超标现象，最大日均值分别为0.457 mg·m-3、0.396 mg·m-3、0.385 mg·m-3，夏季O3污染较重，冬季和夏季O3浓度值相差近2.5倍；O3浓度日间变化呈现倒“U”形分布，峰值出现在17:00左右；冬季和夏季VOCs浓度相差近3倍，VOCs小时值没有较明显的日变化规律，冬季VOCs浓度最高而O3浓度最低，两者反向作用不明显，但NOx浓度与O3呈现对称的反向作用，说明冬季奎屯市O3的生成处于NOx敏感区而非VOCs敏感区；夏季VOCs与NOx变化趋势基本相同，O3浓度水平处于高位，两者呈现对称的反向作用，说明夏季奎屯市O3的生成同时处于VOCs和NOx敏感区，O3生成受VOCs及NOx的交替控制。
Subjects: Environmental Sciences, Resource Sciences >> Basic Disciplines of Environmental Science and Technology submitted time 2019-03-07 Cooperative journals: 《干旱区地理》
Abstract：为了得到实时的大气挥发性有机物( VOCs)浓度组成和日变化特征，2013-2015年在新疆奎屯市区内高约25m的楼顶采用在线的气相色谱仪进行了为期3年的观测。结果表明，奎屯市TVOCs浓度年均值范围66.0-80.7ppbv，低碳烷烃、低碳稀烃、高碳烷烃、苯系物和高碳烯烃为主要的五类VOCs，其浓度之和占TVOCs浓度的84.1%。奎屯市冬季VOCS浓度值是年均值1.5倍、冬夏VOCS浓度相差3倍左右，与其他城市相比，大气挥发性污染物浓度水平整体是偏高。与前两年相比，2015年大气中卤代烃、苯系物、含氧（氮）VOCS的百分含量明显提升，分别上升15.6个百分点、6.5个百分点、5.9个百分点，大气VOCS有毒有害成分比例提升。由于在各类挥发性机物中，相同的条件下卤代烃与其它有机物相比，更容易发生光化学反应，因此，从卤代烃夏季含量很高的变化趋势看，奎屯市夏季发生光化学反应的能力不断增强。
Subjects: Dynamic and Electric Engineering >> Electrical Engineering submitted time 2019-03-05 Cooperative journals: 《电气工程学报》
Abstract：故障树分析法在运用过程中容易产生“维数爆炸”等问题，本文重点研究 基于 BDD 算法的故障树分析法，分析故障树转化为 BDD 的方法，并基于 BDD 算法 求解顶事件发生的概率以及底事件的结构重要度，最后采用该算法进行算例分析与应 用。
Subjects: Dynamic and Electric Engineering >> Electrical Engineering submitted time 2019-03-05 Cooperative journals: 《电气工程学报》
Abstract：为保证脉冲直流环节高频链辅助逆变器较高的输出电压质量，引进 SRSPWM 混合调制策略。该调制前级采用移相控制方式，而移相角度由 6 脉波与三角 载波的占空比决定；后级实现对前级的解调，但在一个基波周期内仅有 1/3 周期处于 调制状态，与传统 SPWM 调制相比大大减小了开关损耗。通过数学推导验证了该调制 方法的可行性，最后对该混合调制策略进行了仿真与实验验证。
Subjects: Computer Science >> Integration Theory of Computer Science submitted time 2019-01-03 Cooperative journals: 《计算机应用研究》
Abstract： To overcome the effects of the intense jam for the full duplex (FD) systems in the extreme spectrum environment, this paper proposed a novel Digital Self-Interference Cancellation (DSIC) method that adapts to the frequency agility full duplex systems. The error compensation model of the full working band was calculated offline and could generate the self-interference (SI) channel coefficients real-timely to reconstruct the SI signal and accomplish the DSIC. The numerical simulation results indicate that the level of the residual SI signal after the DSIC is below the noise floor level in the full band, which also demonstrate the consistency and convergence of the proposed method at different frequency points.
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