原边控制反激式LED驱动电源的研究

针对LED照明驱动电源小体积、低成本的要求,将原边反馈技术应用到反激式LED驱动电源中.开展了原边反馈电路工作原理分析,建立了驱动输出电流与原边MOS管电流、反馈绕组电压波形之间的关系;讨论了电路PFC部分的工作原理,副边二极管导通时间精确测量的方法,以及电路的各种保护;提出了通过调整变压器原边电感量使MOS管工作于准谐振状态,以提高整机工作效率的方法;推导了原边反馈反激电路变压器通用的设计方法,并以18W的LED日光灯驱动电源为例给出了设计步骤;最后,将原型机和同样规格的副边反馈的反激驱动电源进行了对比实验.实验及研究结果表明:采用原边反馈结构以后,LED照明驱动电源电路板面积明显缩小,元器件总数减少了1/3,效率提高了2％,其他电气性能相当,具有较高的实用价值.     

一种高电源抑制的基准源的设计

本文针对传统基准电压的低PSR以及低输出电压的问题,通过采用LDO与带隙基准的混合设计,并且采用BCD工艺,得到了一种可以输出较高参考电压的高PSR(电源抑制)带隙基准。此带隙基准的1.186 V输出电压在低频时PSR为-145 dB,在0～1 GHz频带内,最高PSR为-36 dB。在-50～150℃内,1.186 V基准的温漂为7.5 ppm/℃。     

基于PSR模型的建设工程对环境的影响评价研究

首先针对当前建设工程开发所导致能源消耗和环境污染等问题,从全寿命期的角度对工程环境系统展开分析,提出全寿命内的建设工程环境系统框架。然后进一步分析建设工程对环境的胁迫效应以及环境对工程的约束效应,基于PSR模型构建建设工程对环境的影响评价指标体系,并采用模糊集值统计方法确定各个指标的权重,得到工程系统对环境影响的具体评价值。     

Indentation size effect of germanium single crystal with different crystal orientations

In order to study the indentation size effect (ISE) of germanium single crystals, nano-indentation experiments were carried out on the (100), (110) and (111) plane-orientated germanium single crystals. The true hardness of each crystal plane of germanium single crystals was calculated based on the Meyer equation, proportional sample resistance (PSR) model and Nix—Gao model, and the indentation size effect (ISE) factor of each crystal plane was calculated. Results show that, the germanium single crystals experience elastic deformation, plastic deformation and brittle fracture during the loading process, and the three crystal planes all show obvious ISE phenomenon. All three models can effectively describe the ISE of germanium single crystals, and the calculated value of Nix—Gao model is the most accurate. Compared with the other two crystal planes, Ge (110) has the highest size effect factor m and the highest hardness, which indicates that Ge (110) has the worst plasticity.     

国土空间规划背景下城市水网空间近自然修复规划策略与实践——以江苏省太仓市为例

城市水网空间是典型的蓝绿耦合空间,大多面临蓝绿空间结构失衡、与城市腹地缺少互动、人工干预措施低效三大问题。如何构建多目标集成的蓝绿生态空间,高效修复退化受损的城市水网空间,积极回应经济、社会、环境等各方空间诉求,成为国土空间规划背景下城市水网空间生态修复亟待解决的问题。在基于自然的解决方案（Nature-based Solutions, NbS）理念的启发下,选取江苏省太仓市为研究对象,基于压力-状态-响应（pressure-state-response, PSR）模型,在河段尺度下进行近自然整体生态指标评价,从自然环境、社会发展两方面构建评价方法,构建城市水网空间的近自然修复规划框架。并在宏观尺度“蓝绿耦合”,协调构建“三横三纵多点”的整体生态格局;在中观尺度“以蓝养绿”,提出5类河段空间发展引导策略;在微观尺度“以绿愈蓝”,引导重点地块近自然修复。研究表明,城市水网空间的近自然修复是实现蓝绿要素耦合关联、多价值协同的有效技术途径,有助于提升水网空间治理理念的全局性、治理内容的统筹性、治理方式的耦合性和治理策略的实效性。     

Interferon Regulatory Factor-1 (IRF-1) Is Involved in the Induction of Phosphatidylserine Receptor (PSR) in Response to dsRNA Virus Infection and Contributes to Apoptotic Cell Clearance in CHSE-214 Cell

The phosphatidylserine receptor (PSR) recognizes a surface marker on apoptotic cells and initiates engulfment. This receptor is important for effective apoptotic cell clearance and maintains normal tissue homeostasis and regulation of the immune response. However, the regulation of PSR expression remains poorly understood. In this study, we determined that interferon regulatory factor-1 (IRF-1) was dramatically upregulated upon viral infection in the fish cell. We observed apoptosis in virus-infected cells and found that both PSR and IRF-1 increased simultaneously. Based on a bioinformatics promoter assay, IRF-1 binding sites were identified in the PSR promoter. Compared to normal viral infection, we found that PSR expression was delayed, viral replication was increased and virus-induced apoptosis was inhibited following IRF-1 suppression with morpholino oligonucleotides. A luciferase assay to analyze promoter activity revealed a decreasing trend after the deletion of the IRF-1 binding site on PSR promoter. The results of this study indicated that infectious pancreatic necrosis virus (IPNV) infection induced both the apoptotic and interferon (IFN) pathways, and IRF-1 was involved in regulating PSR expression to induce anti-viral effects. Therefore, this work suggests that PSR expression in salmonid cells during IPNV infection is activated when IRF-1 binds the PSR promoter. This is the first report to show the potential role of IRF-1 in triggering the induction of apoptotic cell clearance-related genes during viral infection and demonstrates the extensive crosstalk between the apoptotic and innate immune response pathways.     

空中交通管制雷达性能检测分析方法

针对我国空中交通管制中心雷达系统运行特点，提出了一种对雷达性能进行检测的初步方案，分析了雷达性能检测所需的关键指标，即PSR（Primary surveillance radar）检测性能和数据质量性能、SSR（Secondary surveillance radar）检测性能和数据质量性能、PSR和SSR联合概率以及有效性。根据可采集的雷达数据信息，详细论述了上述关键指标的分析方法，最后分别就采集周期、PSR检测、SSR代码检测、有效性问题结合具体情况给出数据分析举例。     

一种高电源抑制比的带隙基准电路

提出一种高电源抑制比的带隙基准。该电路的基本结构是将一个简单的电压减法器集成到传统的Brokaw基准中构成改进电路。本电路的基本工作原理是将电源噪声直接添加到电路的反馈环节,帮助抑制电源噪声。仿真结果显示与理论分析吻合。本电路在提高电源抑制的同时,还获得了很好的温度特性。     

葫芦岛市水资源短缺风险评价

本文在区域水资源短缺风险评价过程中运用PSR框架模型和主成分分析法确定指标赋权,科学评价了葫芦岛市1991—2016年的水资源短缺风险状况。研究表明:一直以来,葫芦岛市综合风险值处于较高水平,2004—2013年期间风险最大,虽然2013年以后稍微得到缓和,但人口的持续增长和经济的发展使得葫芦岛市未来仍面临着较高的用水短缺风险;可通过优化产业结构、合理利用各类水源以及加强水资源管理等措施缓解水源短缺风险。研究成果可为优化葫芦岛市产业结构布局和经济重点区域的调整规划提供一定参考依据。     

预测状态表示模型的复位算法

预测状态表示(Predictive State Representations,PSRs)是用于解决局部可观测问题的有效方法.然而,现实环境中,通过样本学习得到的PSR模型不可能完全准确.随着计算步数的增多,利用PSR模型计算得到的预测向量有可能越来越偏离其真实值,进而导致PSR模型的预测精度越来越低.文中提出了一种PSR模型的复位算法.通过使用判别分析方法确定系统所处的PSR状态,文中所提算法可对利用计算获取的预测向量复位,从而提高PSR模型的准确性.实验结果表明,采用复位算法的PSR模型在预测精度上明显优于未采用复位算法的PSR模型,验证了所提算法的有效性.