在一般人群中,尽可能减少受试者负担,且最大限度地正确评估日常膳食营养状态是构建营养流行病学队列研究的前提条件。本文介绍主要膳食营养评估方法的同时,着重说明食物频率问卷(food frequency questionnaire)开发的基本内容及其原则,...在一般人群中,尽可能减少受试者负担,且最大限度地正确评估日常膳食营养状态是构建营养流行病学队列研究的前提条件。本文介绍主要膳食营养评估方法的同时,着重说明食物频率问卷(food frequency questionnaire)开发的基本内容及其原则,并以天津营养流行病学队列研究(TCLSIH队列研究)调查为例,简单说明地区性食物频率问卷开发的问题点和解决策略。在此基础上,初步讨论全国版食物频率问卷开发的必要性和可能性。展开更多
High-voltage storage capacitors(hereinafter call capacitors for short)have been widely used in pulsed power technology.In accordance with the actual work conditions of capacitors,direct current partial discharge(DCPD)...High-voltage storage capacitors(hereinafter call capacitors for short)have been widely used in pulsed power technology.In accordance with the actual work conditions of capacitors,direct current partial discharge(DCPD)detection was put forward.The whole test system was based on the impedance balance circuit characterized by good configuration and anti-interference ability.Through DCPD detection on capacitors which contained four typical defects respectively,test results revealed that DCPD signals could well reflect the state of capacitor insulation.DCPD distribution spectra of capacitors containing four typical defects were obviously different.Defects in capacitors could be exactly judged by computer–aided pattern recognition based on support vector machine(SVM).展开更多
文摘目的探究溃疡性结肠炎(ulcerative colitis,UC)疾病严重程度与焦虑、抑郁程度的相关性及心理干预对UC疗效的影响。方法选取在2022年1月至2023年1月就诊于新疆医科大学第一附属医院消化内科的117例确诊为UC的患者。采用简单临床结肠炎活动指数(simple clinical colitis activity index,SCCAI)和溃疡性结肠炎内镜下严重程度指数(ulcerative colitis endoscopic index of severity,UCEIS)对患者疾病严重程度进行评估,采用广泛性焦虑障碍量表(generalized anxiety disorder-7,GAD-7)和抑郁症筛查量表(patient health questionnaire-9,PHQ-9)对患者心理状态进行评估。分析UC疾病严重程度与焦虑、抑郁程度的相关性,并选取SCCAI评分为中重度组的患者,将患者随机分为两组,基础药物组给予UC基础药物治疗,心理干预组给予基础药物治疗联合心理干预治疗,共治疗20周,6个月后评估心理干预对UC疗效的影响。结果Spearman相关性分析显示,UCEIS评分与SCCAI评分之间存在相关性(r=0.665,P<0.01)。UC患者普遍存在焦虑、抑郁等心理状态,且随着疾病严重程度的增加,焦虑、抑郁程度也随之增加。两组患者治疗前后症状评分及焦虑评分均有所改善,心理干预组较基础治疗组症状评分改善更明显(t=3.512,P<0.05;t=2.154,P<0.05);基础治疗组治疗后焦虑评分较治疗前有所改善(t=2.898,P<0.05),抑郁评分治疗前后无明显差异(t=1.463,P>0.05);心理干预组在治疗后焦虑及抑郁评分均有所下降(t=5.919,P<0.05;t=3.197,P<0.05)。结论随着UC疾病严重程度的加重,患者焦虑、抑郁程度也随之加重。在基础治疗的基础上联合心理干预治疗,能更好地改善UC患者临床症状,并且可以缓解患者焦虑、抑郁状态。
文摘在一般人群中,尽可能减少受试者负担,且最大限度地正确评估日常膳食营养状态是构建营养流行病学队列研究的前提条件。本文介绍主要膳食营养评估方法的同时,着重说明食物频率问卷(food frequency questionnaire)开发的基本内容及其原则,并以天津营养流行病学队列研究(TCLSIH队列研究)调查为例,简单说明地区性食物频率问卷开发的问题点和解决策略。在此基础上,初步讨论全国版食物频率问卷开发的必要性和可能性。
基金Supported by the National Natural Science Foundation of China(Grant No.10476022)Doctoral Innovation Fund of Southwest Jiaotong University
文摘High-voltage storage capacitors(hereinafter call capacitors for short)have been widely used in pulsed power technology.In accordance with the actual work conditions of capacitors,direct current partial discharge(DCPD)detection was put forward.The whole test system was based on the impedance balance circuit characterized by good configuration and anti-interference ability.Through DCPD detection on capacitors which contained four typical defects respectively,test results revealed that DCPD signals could well reflect the state of capacitor insulation.DCPD distribution spectra of capacitors containing four typical defects were obviously different.Defects in capacitors could be exactly judged by computer–aided pattern recognition based on support vector machine(SVM).