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Cumulative burden of lipid profiles predict future incidence of ischaemic stroke and residual risk

Stroke & Vascular Neurology 2021年第4期6卷 581-588,I0049-I0054页

作者： liye dai Jie Xu Yijun Zhang Anxin Wang Zimo Chen Jinglin Mo Hao Li Xia Meng Shouling Wu Yongjun Wang Department of Neurology Beijing Tiantan HospitalCapital Medical UniversityBeijingChina China National Clinical Research Center for Neurological Diseases BeijingChina Department of Cardiology Kailuan HospitalNorth China University of Science and TechnologyTangshanChina

Objectives Incident ischaemic stroke(IS)risk may increase not only with lipids concentration but also with longer duration of *** study aimed to investigate the impact of cumulative burden of lipid profiles on risk of incident *** A total of 43836 participants were enrolled who participated in four surveys during *** cumulative lipid burden was calculated as number of years(2006-2013)multiplied by the levels of low-density lipoprotein cholesterol(LDL-C),total cholesterol(TC),high-density lipoprotein cholesterol(HDL-C),non-HDL C and triglyceride(TG),*** primary outcome was defined as the incident IS during *** During 4.67 years(±0.70 years)follow-up on average,we identified 1023(2.33%)incident *** with respective reference groups,the HRs(95%CIs)of the upper tertile in cumulative TG burden,cumulative LDL-C burden,cumulative TC burden and cumulative non-HDL C burden were 1.26 mmol/L(1.02-1.55 mmol/L),1.47 mmol/L(1.25-1.73 mmol/L),1.33 mmol/L(1.12-1.57 mmol/L)and 1.51 mmol/L(1.28-1.80 mmol/L)for incidence of IS,***,this association was not significant in cumulative HDL-C burden and IS(HR:1.09;95%CI:0.79 to 1.52),after adjustment for confounding *** 16600 participants with low cumulative LDL-C burden,HRs(95%CI)for TC,TG,non-HDL C and HDL-C with IS were 1.63 mmol/L(1.03-2.57 mmol/L),1.65 mmol/L(1.19-2.31 mmol/L),1.57 mmol/L(1.06-2.32 mmol/L)and 0.98 mmol/L(0.56-1.72 mmol/L),*** We observed the correlation between cumulative burden of lipid profiles,except for cumulative burden of HDL-C,with the risk of incident *** burden of TC,TG and non-HDL C may still predict IS in patients with low cumulative LDL-C *** registration number ChiCTR-TNRC 11001489.

关键词： cholesterol burden founding

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Low LDL-C level and intracranial haemorrhage risk after ischaemic stroke:a prospective cohort study

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Stroke & Vascular Neurology 2023年第2期8卷 127-133页

作者： Jie Xu Zimo Chen Meng Wang Jinglin Mo Jing Jing Gulbahram Yalkun liye dai Xia Meng Hao Li Zixiao Li Yongjun Wang Department of Neurology Beijing Tiantan HospitalCapital Medical UniversityBeijingFengtaiChina China National Clinical Research Center for Neurological Diseases BeijingChina

Background and purpose The Treat Stroke to Target trial has confirmed the benefit of targeting low-density lipoprotein cholesterol(LDL-C)of<1.8 mmol/L in patients who had an ischaemic stroke(IS).However,haemorrhagic risk brought by this target level(<1.8 mmol/L)or even lower level(<1.4 mmol/L)of LDL-C should also be *** this study,we aimed to demonstrate whether low LDL-C could increase the intracranial haemorrhage risk following *** Patients who had an IS from China Stroke Center Alliance programme with complete baseline information were prospectively enrolled.793572 patients who had an IS were categorised into 6 groups according to LDL-C level(<1.40 mmol/L,1.40-1.79 mmol/L,1.80-2.59 mmol/L,2.60-2.99 mmol/L,3.00-4.89 mmol/L,≥4.90 mmol/L).The study outcome was defined as intracranial haemorrhage identified during *** regression model was used to examine the association between different LDL-C levels and risk of intracranial *** Compared with patients of LDL-C=1.80-2.59 mmol/L,both subgroups of LDL-C<1.40 mmol/L and LDL-C=1.40-1.79 mmol/L showed significantly higher risk of intracranial haemorrhage(OR=1.26,95%CI=1.18 to 1.35;OR=1.22,95%CI=1.14 to 1.30,respectively).Interaction effect was found to exist between the subgroups of intravenous thrombolytic therapy(p=0.04),rather than the subgroups of age,sex and body mass ***,the sensitivity analyses indicated that even patients who had an IS with minor stroke still suffered from the increased intracranial haemorrhage risk related to low LDL-C *** Among patients who had an IS,the low LDL-C level(<1.4 mmol/L or<1.8 mmol/L)at baseline is associated with increased risk of intracranial haemorrhage during acute *** actively lowering LDL-C level for patients who had an IS,clinicians should also concern about the haemorrhagic risk associated with low LDL-C level.

关键词： intracranial prospective cholesterol

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Different contribution of SBP and DBP variability to vascular events in patients with stroke

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Stroke & Vascular Neurology 2020年第2期5卷 110-115页

作者： liye dai Aichun Cheng Xiwa Hao Jie Xu Yingting Zuo Anxin Wang Xia Meng Hao Li Yilong Wang Xingquan Zhao Yongjun Wang Department of Neurology Beijing Tiantan HospitalCapital Medical UniversityBeijingChina China National Clinical Research Center for Neurological Diseases BeijingChina Department of Neurology Inner Mongolia Baotou City Central HospitalBaotouChina

Background High blood pressure variability(BPV)is a novel risk factor for cardiovascular ***,the heterogeneity of systolic blood pressure variability(SBPV)and diastolic blood pressure variability(DBPV)for different vascular events remains *** study aims to investigate whether SBPV or DBPV has different contribution to vascular events in patients with acute ischaemic stroke(IS)or transient ischaemic attack(TIA).Methods Data from the BOSS(blood pressure and clinical outcome in TIA or IS)study were examined for vascular events at 3-month and 1-year *** was defined as the SD and coefficient of variation(CV)of day-to day measurements within 3 months after IS/*** events include cardiovascular events(myocardial infarction,unstable angina,cardiac death and congestive heart failure)and cerebrovascular events(ischaemic or haemorrhagic stroke).Logistic regression model was used to test the associations between BPV and vascular *** Of 2325 patients with IS or TIA,103(4.43%)experienced a recurrent stroke and 64(2.75%)had cardiovascular events within 3 ***-to day SBPV was only associated with stroke recurrence(BPVSD:OR,1.72,95%CI 1.09 to 2.71;BPVCV:1.86,95%CI 1.19 to 2.92),but not cardiovascular events(BPVSD:1.67,95%CI 0.94 to 2.94;BPVCV:1.51,95%CI 0.86 to 2.64).However,DBPV seems to be related to both stroke(BPVSD:1.60,95%CI 1.02 to 2.49;BPVCV:1.53,95%CI 0.99 to 2.37)and cardiovascular events(BPVSD:2.48,95%CI 1.37 to 4.48;BPVCV:1.92,95%CI 1.09 to 3.36).Similar results were found at 1 *** For patients with IS/TIA,stroke recurrence was associated with both SBPV and DBPV;however,cardiovascular events seem to be only related to DBPV.

关键词： patients cardiovascular unstable

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LED光环境调控对植物影响的研究进展

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分子植物育种 2024年第22期22卷 7535-7545页

作者：代绿叶顾益银韩莹琰北京农学院植物科学技术学院农业应用新技术北京市重点实验室北京102206

本研究主要阐述LED光环境调控对植物影响的研究进展,总结光质、光照强度和光周期三个因子对植物生长、品质、光合特性的影响。综合可知,在光质方面,红光、蓝光、红蓝复合光对植物的生长、品质、光合特性都有一定的促进作用,红光调控植... 详细信息

本研究主要阐述LED光环境调控对植物影响的研究进展,总结光质、光照强度和光周期三个因子对植物生长、品质、光合特性的影响。综合可知,在光质方面,红光、蓝光、红蓝复合光对植物的生长、品质、光合特性都有一定的促进作用,红光调控植物的生长发育,而蓝光能够调控植物的营养品质和次生代谢物的提高,以红蓝复合光最佳;在光照强度方面,适宜的光照强度有利于提高植物的生长速率和光合特性,改善植物品质,过高或过低均不利于植物生长;在光周期方面,合理调控光周期能够改善植物的生长、品质和光合特性。植物依据对光周期的响应分为长日照植物、短日照植物和日中性植物,在一定范围内光照时间延长对植物的影响应依据植物种类而异,不同的植物对光质、光照强度和光周期的需求不同。本研究为植物的生长发育和培育壮苗提供参考。

关键词： LED光环境调控植物光质光照强度光周期

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电除尘器空载升压试验中几个问题的探讨

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华北电力技术 1998年第7期 39-39页

作者：戴立业承德滦河发电厂

对于新安装和大修后的电除尘器，必须进行空载升压试验，以检查电除尘器本体的安装（检修）质量，特别是阴、阳极的间距。１空载升压试验标准电除尘器空载升压时，究竟电压升到多少才算合格？对此，电力行业标准《燃煤电厂电除尘器》（... 详细信息

对于新安装和大修后的电除尘器，必须进行空载升压试验，以检查电除尘器本体的安装（检修）质量，特别是阴、阳极的间距。１空载升压试验标准电除尘器空载升压时，究竟电压升到多少才算合格？对此，电力行业标准《燃煤电厂电除尘器》（ＤＬ４６１—９２）中明确规定：对异...

关键词：电除尘器除尘器空载升压试验火力发电厂

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一种基于径向充磁的霍尔式新型角度传感器

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厦门大学学报（自然科学版） 2016年第1期55卷 126-130页

作者：王新峰许彬彬戴立业张金辉陈文芗厦门大学物理与机电工程学院福建厦门361005

利用径向磁铁的磁感应强度沿径向同心圆正弦分布的特点,设计了一款新型角度传感器.分析了基于线性霍尔元件和径向充磁的角度测量原理,给出了角度计算方法,并设计制作了角度传感器.实验表明,该角度传感器结构简单,测量重复性好,绝对误差... 详细信息

利用径向磁铁的磁感应强度沿径向同心圆正弦分布的特点,设计了一款新型角度传感器.分析了基于线性霍尔元件和径向充磁的角度测量原理,给出了角度计算方法,并设计制作了角度传感器.实验表明,该角度传感器结构简单,测量重复性好,绝对误差小于0.3°.

关键词：角度传感器霍尔元件嵌入式系统径向磁铁

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Analysis on the hourly spatiotemporal complementarities between China's solar and wind energy resources spreading in a wide area

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Science China Technological Sciences 2013年第3期56卷 683-692页

作者： LIU Yi XIAO liye WANG HaiFeng dai ShaoTao QI ZhiPing Key Laboratory of Applied Superconductivity Chinese Academy of Sciences Institute of Electrical Engineering Chinese Academy of Sciences The Queen's University of Belfast Belfast BT9 5AHUK

China is rich in solar and wind energy resources,of which the proportion of China’s power sources has been rapidly *** fluctuating and intermittent energy sources will bring significant challenges to the safe and stable operation power ***,making use of the spatiotemporal complementarities between different renewable energy resources is a feasible way to level fluctuating power especially when they have a widely geographical *** on the data provided by China Meteorological Administration(CMA),this research explores the spatiotemporal complementarities between wind and solar energy *** paper nondimensionalizes hourly wind speed and global solar radiation data and employs several indexes to compare the smoothing effect with various combining *** results show that combining wind and solar powers within a certain area can cause a fall of zero-power or very-full power ***,combining different resources improves ’smoothness’ in power output when compared with that from each individual ***,under hourly time scale,when the dispersion of sites is large enough,the smoothing effect of combining the dispersed wind power is very close to the combination of those two different ***,this complementary effect is much better than that of just combining solar energy resources.

关键词： wind energy solar energy complementarities renewable energy

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Investigation on the spatiotemporal complementarity of wind energy resources in China

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Science China(Technological Sciences) 2012年第3期55卷 725-734页

作者： LIU Yi XIAO liye1,2 WANG HaiFeng LIN LiangZhen dai ShaoTao Key Laboratory of Applied Superconductivity Chinese Academy of SciencesBeijing 100190China Institute of Electrical Engineering Chinese Academy of SciencesBeijing 100190China The Queen's University of Belfast Belfast BT95AHUK

Wind power resources are abundant in China,especially in northern China and eastern coastal areas of ***,wind energy has intermittent and unstable characteristics,which leads to random power output and limits the large-scale utilization of wind energy *** has been shown that geographically dispersed wind plants have obvious spatiotemporal offsetting *** output from each individual site exhibits the power ups and ***,when we simulate power lines connecting sites over a certain region,the output from them changes slowly and rarely reaches either very low or full *** using the spatiotemporal complementarity of wind resources effectively is highly beneficial to the smoothing of power *** paper investigates the spatiotemporal complementarity of wind resources in China based on the relevant data of wind energy resources,which are offered by China Meteorological Administration(CMA).

关键词： wind energy complementarity renewable energy

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Investigation of pressure drop in flexible ventilation ducts under different compression ratios and bending angles

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Building Simulation 2021年第4期14卷 1251-1261页

作者： Ho Kam dai Wenjie Huang liye Fu Chao-Hsin Lin Daniel Wei Zhongzhe Dong Ruoyu You Chun Chen Department of Mechanical and Automation Engineering The Chinese University of Hong KongShatinN.T.999077Hong KongChina Department of Building Services Engineering The Hong Kong Polytechnic UniversityKowloon999077Hong KongChina Environmental Control Systems Boeing Commercial AirplanesEverettWA98203USA Boeing Research&Technology Beijing100027China Shenzhen Research Institute The Chinese University of Hong KongShenzhen518057China

Due to the large degree of freedom in terms of design and installation, flexible ventilation ducts are commonly used in ventilation systems. However, excessive use of flexible ducts may lead to greater pressure drop and higher energy consumption. This study conducted experimental measurements to characterize the pressure drop in flexible ventilation ducts with different compression ratios and bending angles. This investigation first measured the pressure drop in straight flexible ducts with four compression ratios under various airflow rates. The calculated friction factor for the straight flexible ducts was negatively associated with the compression ratio. Next, the pressure drops in single-bend flexible ducts with various bending angles from 30° to 150° were measured under various airflow rates. The calculated loss coefficient of the bend increased with the bending angle for single-bend flexible ducts. Finally, the influence of the intermediate duct length on the pressure drop across two bends was experimentally investigated. When the length of the intermediate duct was greater than eight times the inner diameter, the pressure drop across a double-bend flexible duct could be calculated from the friction factors and loss coefficients with a relative error less than 1%. The data obtained in this study can be used to calculate the total pressure loss in flexible ventilation ducting systems in buildings.

关键词： ventilation pressure loss flex duct fan energy friction factor loss coefficient

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The Optimization of Gray Model Applied to Super Short-term Load Forecasting

The Optimization of Gray Model Applied to Super Short-term L...

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2010 3rd International Conference on Computer and Electrical Engineering(ICCEE 2010)

作者： Jiaxing Zhai Shaotao dai liye Xiao Institute of Electrical Engineering Chinese Academy of Sciences

Gray model theory is a widely used technique in load forecasting. However, there are some problems when classic gray model is used in super short-term load forecasting because of the theory itself and external factors. To solve these problems and improve forecasting accuracy, an improved gray model is introduced in this paper to be applied on super short-term electric load forecasting. In this improved model, original data is analyzed and processed. Inner structure is also optimized and residual correction is introduced. By computing the correlation of actual data and different prediction results, the best prediction program is chosen to obtain smaller errors and better results. The forecasting algorithm can estimate model parameters, meet the requirement of dynamic power load and overcome random disturbances. Example analysis and simulation show that the forecasting error is about 2 percent when used in super short-term load forecasting. Compared with conventional gray model methods, the proposed scheme has the characteristic of simple computation, high forecasting precision and good applicability.

关键词： super short-term electric load forecasting gray model parameter modification correlation analysis posteriori error checking residul correction.

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