核电厂蒸汽发生器多功能模拟体研制

在压水堆核电厂蒸汽发生器的在役检查和维修中,需要使用蒸汽发生器模拟体,预先对检修工器具进行调试、验证以及人员的培训。基于蒸汽发生器模拟体的功能需求和设计要求,研制了一种可满足多种需求的蒸汽发生器模拟体,模拟体总体结构设计为原型二分之一,选用复合材料,并设置有观察窗。模拟体具有结构紧凑、经济性高、可观测等特点。功能试验验证结果表明,本文所述蒸汽发生器模拟体可有效用于核电厂蒸汽发生器的检修培训。     

An analytical model for water-oil two-phase flow in inorganic nanopores in shale oil reservoirs

The existence of water phase occupies oil flow area and impacts the confined oil flow behavior at the solid substrate in inorganic nanopores of shale oil reserv...     

基于可逆跳 MCMC 的 AR 模型定阶方法

由于传统的 AR 模型定阶方法在小样本情况下经常会失效,所以提出一种基于可逆跳马尔科夫蒙特卡罗(MCMC)的 AR 模型定阶方法,仿真结果表明该方法可行有效.     

嵌入式SRAM的优化修复方法及应用

为了提高SRAM的成品率并降低其功耗,提出一种优化的SRAM.通过增加的冗余逻辑及电熔丝盒来代替SRAM中的错误单元,以提高其成品率;通过引入电源开启或关闭状态及隔离逻辑降低其功耗.利用二项分布计算最佳冗余逻辑,引入成品率边界因子判定冗余逻辑的经济性.将优化的SRAM64K×32应用到SoC中,并对SRAM64K×32 的测试方法进行了讨论.该SoC经90nm CMOS工艺成功流片, 芯片面积为5.6mm×5.6mm, 功耗为1997mW.测试结果表明:优化的SRAM64K×32 在每个晶圆上的成品率提高了9.267%,功耗降低了17.301%.     

300 MW机组蒸汽过热度保护方案改进

为消除锅炉因煤质差频繁熄火对电厂经济效益的影响,实现充分利用蓄热保持机组不解列,达到迅速恢复点火并充分保证设备安全性的目的.贵溪发电有限责任公司对2×300 MW机组机炉联锁方案进行改造,增加主蒸汽过热度保护逻辑.同时对MFT动作信号联锁逻辑进行优化.改造后两台机组因锅炉熄火引起的非计划停运大幅减少,同时节省大量燃油,且能够充分保证机组安全性,实施效果较好.实践证明,该改造方案能够在保证机组安全的情况下创造较好的经济效益,可以给同类型机组以借鉴.     

西门子6RA70直流装置在中板三辊压下改造中的应用

本文介绍西门子6RA70直流调速装置的调速实现及在中板三辊轧机压下中的应用.     

蜂蜡对大豆分离蛋白/羧甲基纤维素复合材料性能的影响

研究蜂蜡对大豆分离蛋白/羧甲基纤维素复合材料性能的影响。当蜂蜡添加量增加,复合材料的颜色变黄;透明度、水蒸气透过率和断裂伸展率降低,氧气透过率升高。      

Pleiotropic Effects of APOB Variants on Lipid Profiles,Metabolic Syndrome,and the Risk of Diabetes Mellitus

Apolipoprotein B (ApoB) plays a crucial role in lipid and lipoprotein metabolism. The effects of APOB locus variants on lipid profiles, metabolic syndrome, and the risk of diabetes mellitus (DM) in Asian populations are unclear. We included 1478 Taiwan Biobank participants with whole-genome sequence (WGS) data and 115,088 TWB participants with Axiom genome-wide CHB array data and subjected them to genotype–phenotype analyses using APOB locus variants. Five APOB nonsynonymous mutations, including Asian-specific rs144467873 and rs13306194 variants, were selected from participants with the WGS data. Using a combination of regional association studies, a linkage disequilibrium map, and multivariate analysis, we revealed that the APOB locus variants rs144467873, rs13306194, and rs1367117 were independently associated with total, low-density lipoprotein (LDL), and non-high-density lipoprotein (non-HDL) cholesterol levels; rs1318006 was associated with HDL cholesterol levels; rs13306194 and rs35131127 were associated with serum triglyceride levels; rs144467873, rs13306194, rs56213756, and rs679899 were associated with remnant cholesterol levels; and rs144467873 and rs4665709 were associated with metabolic syndrome. Mendelian randomization (MR) analyses conducted using weighted genetic risk scores from three or two LDL-cholesterol-level-associated APOB variants revealed significant association with prevalent DM (p = 0.0029 and 8.2 × 10⁻⁵, respectively), which became insignificant after adjustment for LDL-C levels. In conclusion, these results indicate that common and rare APOB variants are independently associated with various lipid levels and metabolic syndrome in Taiwanese individuals. MR analyses supported APOB variants associated with the risk of DM through their associations with LDL cholesterol levels.     

A Changing Light Environment Induces Significant Lateral CO2 Diffusion within Maize Leaves

A leaf structure with high porosity is beneficial for lateral CO₂ diffusion inside the leaves. However, the leaf structure of maize is compact, and it has long been considered that lateral CO₂ diffusion is restricted. Moreover, lateral CO₂ diffusion is closely related to CO₂ pressure differences (ΔCO₂). Therefore, we speculated that enlarging the ΔCO₂ between the adjacent regions inside maize leaves may result in lateral diffusion when the diffusion resistance is kept constant. Thus, the leaf structure and gas exchange of maize (C₄), cotton (C₃), and other species were explored. The results showed that maize and sorghum leaves had a lower mesophyll porosity than cotton and cucumber leaves. Similar to cotton, the local photosynthetic induction resulted in an increase in the ΔCO₂ between the local illuminated and the adjacent unilluminated regions, which significantly reduced the respiration rate of the adjacent unilluminated region. Further analysis showed that when the adjacent region in the maize leaves was maintained under a steady high light, the photosynthesis induction in the local regions not only gradually reduced the ΔCO₂ between them but also progressively increased the steady photosynthetic rate in the adjacent region. Under field conditions, the ΔCO₂, respiration, and photosynthetic rate of the adjacent region were also markedly changed by fluctuating light in local regions in the maize leaves. Consequently, we proposed that enlarging the ΔCO₂ between the adjacent regions inside the maize leaves results in the lateral CO₂ diffusion and supports photosynthesis in adjacent regions to a certain extent under fluctuating light.