云南中烟差异化原料的品种差异化探索

为实现卷烟原料差异化的品种差异化,2006~2007年在云南省七市（州）的44个差异化原料核心生产基地县内,采取从现有主栽传统优良品种中筛选及国外引进的双重路线,通过试验研究及大量采样化验评吸等对比分析,确定红花大金元和K326为实施原料差异化的主栽稳定种植品种;并从引进的7个美国F1代优良杂交品种中择优选择了风格特征明显、生态适应性较广、抗病毒病强的NC102,NC297,NC55作为扩大生产示范品种,其中NC102和NC207的综合表现超过对照K326,可作为原料差异化的主栽品种,更彰显品种差异化特色.     

学校体育与兵源质量关系研究

伴随征兵要求改革,对应征人员的学历要求逐步提高,高校及部分高中生成为主要兵源,而兵源体质呈下降趋势。采用文献资料等方法对兵源体质下降原因和学校体育与兵源关系进行分析研究,认为:抓好学校体育,全面提升学生身体素质,有利于提高兵源质量,对我国国防建设具有积极意义。     

Average acceleration and intensity gradient of primary school children and associations with indicators of health and well-being

ABSTRACT

Average acceleration (AvAcc) and intensity gradient (IG) have been proposed as standardised metrics describing physical activity (PA) volume and intensity, respectively. We examined hypothesised between-group PA differences in AvAcc and IG, and their associations with health and well-being indicators in children. ActiGraph GT9X wrist accelerometers were worn for 24-h·d^?1 over 7days by 145 children aged 9–10. Raw accelerations were averaged per 5-s epoch to represent AvAcc over 24-h. IG represented the relationship between log values for intensity and time. Moderate-to-vigorous PA (MVPA) was estimated using youth cutpoints. BMI z-scores, waist-to-height ratio (WHtR), peak oxygen uptake (VO₂peak), Metabolic Syndrome risk (MetS score), and well-being were assessed cross-sectionally, and 8-weeks later. Hypothesised between-group differences were consistently observed for IG only (p < .001). AvAcc was strongly correlated with MVPA (r = 0.96), while moderate correlations were observed between IG and MVPA (r = 0.50) and AvAcc (r = 0.54). IG was significantly associated with health indicators, independent of AvAcc (p < .001). AvAcc was associated with well-being, independent of IG (p < .05). IG was significantly associated with WHtR (p < .01) and MetS score (p < .05) at 8-weeks follow-up. IG is sensitive as a gauge of PA intensity that is independent of total PA volume, and which relates to important health indicators in children.     

标准分数在高职学生考试成绩评定中的应用——以浙江东方职业技术学院为例

原始分数自身存在的不足使其不能准确反映高职院校学生的真实考试成绩。本文通过对标准分数的阐释和对其在浙江东方职业技术学院09级学生考试成绩中的应用,证明了标准分数在高职学生考试成绩评定中的应用的可行性。     

某立交桥混凝土连续梁C50混凝土配合比设计

C50混凝土广泛运用于桥梁的上部结构中,由于混凝土配合比设计不合理,往往引起混凝土强度不合格、收缩裂缝等问题发生.某立交桥连续梁所需C50混凝土要求非常高,根据大量的试验以及成功的生产经验,阐述了C50混凝土的原材料选择以及配合比设计.     

论图书馆对零次信息的加工升级和开发利用

本文针对图书馆对零次信息加工升级和开发利用的现状分析,指出了零次信息开发加工利用的意义和目的,提出图书馆对零次信息价值开发利用模式的设想,强调图书馆对零次信息的加工升级及其开发利用的优势,并根据信息构建理论,大胆提出了构建零次信息,以最大限度地开发利用零次信息的价值。     

α-熊果苷合成研究进展

α-熊果苷对黑色素合成酶-酪氨酸酶具有很好的抑制作用,对人体肌肤的美白作用是β-熊果苷的10倍以上,并且不会抑制人体细胞的生长,无毒副作用;介绍了3种合成α-熊果苷的方法,植物细胞组织作为生物反应器法、微生物细胞转化法、酶合成法;其中与酶工程相联系的转基因微生物生产α-熊果苷和手性催化剂催化合成α-熊果苷是未来主要的发展方向。     

Development of raw acceleration cut-points for wrist and hip accelerometers to assess sedentary behaviour and physical activity in 5–7-year-old children

ABSTRACT

This study validated sedentary behaviour (SB), moderate-to-vigorous physical activity (MVPA) and vigorous physical activity (VPA) accelerometer cut-points in 5–7-year-old children. Participants (n = 49, 55% girls) wore an ActiGraph GT9X accelerometer, recording data at 100 Hz downloaded in 1 s epochs, on both wrists and the right hip during a standardised protocol and recess. Cut-points were generated using ROC analysis with direct observation as a criterion. Subsequently, cut-points were optimised using Confidence intervals equivalency analysis and then cross-validated in a cross-validation group. SB cut-points were 36 mg (Sensitivity (Sn) = 79.8%, Specificity (Sp) = 56.8%) for non-dominant wrist, 39 mg (Sn = 75.4%, Sp = 70.2%) for dominant wrist and 20 mg (Sn = 78%, Sp = 50.1%) for hip. MVPA cut-points were 189 mg (Sn = 82.6%, Sp = 78%) for non-dominant wrist, 181 mg (Sn = 79.1%, Sp = 76%) for dominant wrist and 95 mg (Sn = 79.3%, Sp = 75.6%) for hip. VPA cut-points were 536 mg (Sn = 75.1%, Sp = 68.7%) for non-dominant wrist, 534 mg (Sn = 67.6%, Sp = 95.6%) for dominant wrist and 325 mg (Sn = 78.2%, Sp = 96.1%) for hip. All placements demonstrated adequate levels of accuracy for SB and PA assessment.     

Accelerometry-Based Characteristics of Overall Sedentary Behavior and Sitting in Middle-Aged Adults

ABSTRACT

The purpose of this study was to describe the accelerometry-based characteristics of overall sedentary behavior (SB) and sitting among adults under free-living conditions. Thirty-six (mean age 47.6 years) volunteers carried a waist-worn accelerometer for ≥4 days with data ≥600 min/d during 14 consecutive days. A machine learning (ML) based method was used to classify the patterns of SB and sitting from raw 3D acceleration. The participants spent most (69.3%) of their waking time in SB, and a half (52.2%) of the SB was performed in a sitting posture. Men broke their overall sedentary time less often (4.1 vs. 6.1 bouts/h), but women sat more; however, women broke their sitting time as often as men (7.6 bouts/h). This study confirms that SB and sitting can be distinguished using ML methods, and more information about SB can be achieved when overall SB and sitting are analyzed separately in free-living conditions.     

浮法玻璃原料质量控制

优质的浮法玻璃原料质量,是生产高品质浮法玻璃的重要基础。浮法玻璃原料质量控制和管理工作,需要对原料矿点生产及储运过程进行质量控制、对进厂原料化学成分及其均匀性和稳定性、水分、粒度及其粒度组成、难熔重矿物含量进行质量控制。