Assessment of functional prognosis of anterior cruciate ligament reconstruction in athletes based on a body shape index

BACKGROUND A healthy body shape is essential to maintain athletes’sports level.At present,little is known about the effect of athletes’body shape on anterior cruciate ligament reconstruction(ACLR).Moreover,the relationship between body shape and variables such as knee joint function after operation and return to the field has not been well studied.AIM To verify the relationship between a body shape index(ABSI)and the functional prognosis of the knee after ACLR in athletes with ACL injuries.METHODS We reviewed 76 athletes with unilateral ACL ruptures who underwent ACLR surgery in the First Hospital of Shanxi Medical University between 2017 and 2020,with a follow-up period of more than 24 mo.First,all populations were divided into a High-ABSI group(ABSI>0.835,n=38)and a Low-ABSI group(ABSI<0.835,n=38)based on the arithmetic median(0.835)of ABSI values.The primary exposure factor was ABSI,and the outcome indicators were knee function scores as well as postoperative complications.The correlation between ABSI and postoperative knee function scores and postoperative complications after ACLR were analyzed using multifactorial logistic regression.RESULTS The preoperative knee function scores of the two groups were similar.The surgery and postoperative rehabilitation exercises,range of motion(ROM)compliance rate,Lysholm score,and Knee Injury and Osteoarthritis Outcome Score of the two groups gradually increased,whereas the quadriceps atrophy index gradually decreased.The knee function scores were higher in the Low-ABSI group than in the High-ABSI group at the 24-mo postoperative follow-up(P<0.05).In multifactorial logistic regression,ABSI was a risk factor of low knee joint function score after surgery,specifically low ROM scores(odds ratio[OR]=1.31,95%confidence interval[CI][1.10-1.44];P<0.001),low quadriceps atrophy index(OR=1.11,95%CI[0.97-1.29];P<0.05),low Lysholm scores(OR=2.34,95%CI[1.78-2.94];P<0.001),low symptoms(OR=1.14,95%CI[1.02-1.34];P<0.05),low activity of daily living(OR=1.34,95%CI[1.18-1.65];P<0.05),low sports(OR=2.47,95%CI[1.78-2.84];P<0.001),and low quality of life(OR=3.34,95%CI[2.88-3.94];P<0.001).ABSI was also a risk factor for deep vein thrombosis of the lower limb(OR=2.14,95%CI[1.88-2.36],P<0.05]and ACL recurrent rupture(OR=1.24,95%CI[0.98-1.44],P<0.05)after ACLR.CONCLUSION ABSI is a risk factor for the poor prognosis of knee function in ACL athletes after ACLR,and the risk of poor knee function after ACLR,deep vein thrombosis of lower limb,and ACL recurrent rupture gradually increases with the rise of ABSI.

Combined Effects of A Body Shape Index and Serum C-reactive Protein on Ischemic Stroke Incidence among Mongolians in China

Objective We aimed to evaluate the combined effects of a high body shape index(ABSI) and a high serum C-reactive protein(CRP) level on the incidence of ischemic stroke in a Mongolian population in China. Methods A prospective cohort study was conducted among 2,589 participants from June 2002 to July 2012 in Inner Mongolia, China. The participants were categorized into 4 groups according to their level of ABSI and CRP. Cox proportional hazards models were used to assess the hazard ratios(HRs) and 95% confidence intervals(CIs) for ischemic stroke among all groups. Results The multivariate adjusted HRs(95% CI) of ischemic stroke for high ABSI and high CRP level were 1.46(0.89-2.39) and 1.63(0.95-2.79), respectively. Compared with the low ABSI/low CRP level group, the multivariate adjusted HRs(95% CI) of ischemic stroke in the low ABSI/high CRP, high ABSI/low CRP, and high ABSI/high CRP groups were 1.04(0.46-2.35), 1.06(0.58-1.95) and 2.52(1.27-5.00), respectively. The HR of ischemic stroke for the high ABSI/high CRP level group was the highest and most statistically significant. Conclusion We found that participants with simultaneously high ABSI and high CRP levels had the highest risk of ischemic stroke in the Mongolian population. Our findings suggest that the combination of high ABSI and high CRP levels may increase the risk of ischemic stroke.

Shape Analysis of Agricultural Parcels for Land Consolidation Priorities in Tekirdag Province,Turkey

Shape irregularity,a sub-factor of parcel fragmentation is a problem that hinders sustainable agriculture and is solved using land consolidation projects.Determination of the parcel shape degree contributes significantly to spatial prioritization where there is also a high probability of achieving positive effects of consolidation projects.This study aims to determine the shape degree of the agricultural parcels both at singular and rural county scales in Tekirdag Province,Turkey in 2020 by combining the parcel shape index(PSI) with the minimum bounding geometry index(MBG) to improve parcel scores.Hot-spot zones of the highly irregular and near optimum parcels were also determined using Getis-Ord G_(i)^(*) statistic.The parcel degrees were classified into four categories,namely highly irregular,irregular,regular and near optimum.The obtained unweighted scores of the parameters exhibit deviations from the expected values.After weighting by pairwise comparison,the values approached ideal scores.Among 346 740 parcels,53% were highly irregular and irregular and 47% were regular and near optimum shapes after weighting whereas these were 70% and 30%,respectively before weighting.The average parcel degree of 63 rural counties was regular while the average parcel degree of the remaining 264 rural counties was irregular.The combined use of PSI and MBG index improved the correctness of the parcel shape score.It could be suggested to use as a tool in land consolidation prioritization.

Development of fragility curves by incorporating new spectral shape indicators and a weighted damage index:case study of steel braced frames in the city of Mashhad,Iran

In this study, strong ground motion record （SGMR） selection based on Eta （~/） as a spectral shape indicator has been investigated as applied to steel braced flame structures. A probabilistic seismic hazard disaggregation analysis for the definition of the target Epsilon （ε） and the target Eta （η） values at different hazard levels is presented, taking into account appropriately selected SGMR＇s. Fragility curves are developed for different limit states corresponding to three representative models of typical steel braced frames having significant irregularities in plan, by means of a weighted damage index. The results show that spectral shape indicators have an important effect on the predicted median structural capacities, and also that the parameter r/is a more robust predictor of damage than searching for records with appropriate c values.

Spatio-temporal evolution analysis of landscape pattern and habitat quality in the Qinghai Province section of the Yellow River Basin from 2000 to 2022 based on InVEST model

Habitat quality is an important indicator for evaluating the quality of ecosystem.The Qinghai Province section of the Yellow River Basin plays an important role in the ecological protection of the upper reaches of the Yellow River Basin.To comprehensively analysis the alterations of habitat quality in the Qinghai Province section of the Yellow River Basin,this study utilized the Integrated Valuation of Ecosystem Services and Tradeoffs(InVEST)model to calculate the habitat quality index and analyze the spatio-temporal variation characteristics of habitat quality in the study area from 2000 to 2022,and calculated seven landscape pattern indices(number of patches,patch density,largest patch index(LPI),landscape shape index(LSI),contagion index(CONTAG),Shannon diversity index,and Shannon evenness index)to research the variation of landscape pattern in the study area.The results showed that the number of patches,patch density,LPI,LSI,Shannon diversity index,and Shannon evenness index increased from 2000 to 2022,while the CONTAG decreased,indicating that the landscape pattern in the Qinghai Province section of the Yellow River Basin changed in the direction of distribution fragmentation,shape complexity,and heterogeneity.The average value of the habitat quality index in the Qinghai Province section of the Yellow River Basin from 2000 to 2022 was 0.90.Based on the value of habitat quality index,we divided the level of habitat quality into five categories:lower(0.00-0.20),low(0.20-0.40),moderate(0.40-0.60),high(0.60-0.80),and higher(0.80-1.00).Most areas were at the higher habitat quality level.The lower habitat quality patches were mainly distributed in Longyang Gorge and Yellow River-Huangshui River Valley.From 2000 to 2022,the habitat quality in most areas was stable;the increase areas were mainly distributed in Guinan County,while the decrease areas were mainly distributed in Xining City,Maqen County,Xinghai County,Qumarleb County,and Darlag County.To show the extent of habitat quality variation,we calculated Sen index.The results showed that the higher habitat quality area had a decrease trending,while other categories had an increasing tendency,and the decreasing was faster than increasing.The research results provide scientific guidance for promoting ecological protection and high-quality development in the Qinghai Province section of the Yellow River Basin.

贵州不同产区蜂糖李果实糖酸组分差异及品质评价

【目的】探明贵州不同产区蜂糖李果实的糖酸品质特征,为提高蜂糖李果品质量整体水平和促进产业可持续发展提供参考。【方法】以贵州安顺4个种植区(AZNL、AZND、AZNJ和AZYH)、黔南州3个种植区(QNLF、QNLM和QNHD)以及贵阳(GXFS)、黔西南州(QXQG)、铜仁市(TYHG)和遵义市(ZSYX)种植的蜂糖李新鲜成熟果实为材料,考察果形指数和硬度等外观品质,检测分析果实糖酸组分及含量、可溶性固形物和可滴定酸含量等主要风味指标,并对果品品质22个指标进行主成分分析和系统聚类分析。【结果】11份蜂糖李果实糖含量为102.29~160.71 mg/g,糖组分以蔗糖含量最高,平均56.21 mg/g,山梨醇含量最低,仅20.71 mg/g;有机酸含量为5.29~7.89 mg/g,有机酸组分以苹果酸含量最高,平均达5.31 mg/g,抗坏血酸含量最低,仅0.04 mg/g。主成分分析共提取5个主成分,累积贡献率达92.89%,获得品质评价函数:F=0.361 F_(1)+0.241 F_(2)+0.153 F_(3)+0.107 F_(4)+0.066 F5。聚类分析显示,QXQG和AZNL各为一类,其余9个样品聚为一类,其中,AZNL和QXQG综合得分较高,品质最佳。【结论】贵州11份不同种植区蜂糖李果实品质依次为AZNL> QXQG> QNLF> AZNJ> AZND> QNLM> AZYH> QNHD> GXFS> ZSYX>TYHG。

2000—2018年长株潭城市群城市扩张及其热岛响应

城市热岛效应同城市居民福祉息息相关,特别是近20 a我国的中西部城市在快速城市化的背景下,城市扩张进程进一步加快,城市热岛效应的影响也随之不断增加。为探究城市及城市群扩张与城市热岛效应变化的关系,以长株潭城市群为研究区域,利用Boyce-Clark形状指数分析城市扩张进程及空间形态变化。首先,利用基于Google Earth Engine(GEE)平台的实用单通道算法进行温度反演;然后,使用均值-标准差法划分温度等级区并定义和提取城市热岛范围;最后,提取城市重心和热岛重心,采用重心迁移方法分析城市扩张与热岛效应之间的变化趋势。结果表明城市热岛变化与城市群城市扩张趋势一致,研究结论如下:①2015年后长株潭城市群进入高速发展关键时期;②城市扩张是热岛面积增加的主要原因;③城市热岛重心与城市重心迁移趋势基本一致,城市热岛范围增加的方向也同城市扩张方向基本一致。

体型指数与动脉硬化关系的研究进展

体型指数(ABSI)是基于身高、体质量、腰围等测量指标通过特定算法衍生的新型人体测量学指标。随着超重和肥胖人群的日益增多,腹型肥胖对于心血管事件发生和死亡的预测作用更强。肥胖通过产生炎症因子,诱发慢性炎症反应、胰岛素抵抗、代谢紊乱和氧化应激途径等导致动脉硬化、高血压、冠心病等心血管疾病的发病甚至死亡。ABSI与腹型肥胖相关性较好,在部分人群中可以预测动脉硬化,但同时也受到人群特征的影响。例如,不同地区、性别和年龄的人群中,ABSI与动脉硬化之间的相关性存在差异。明确ABSI与动脉硬化的关系,对早期发现动脉硬化的高危人群和合理防治心血管疾病有重要意义。

城镇化、技术创新影响全要素能源利用效率的中介效应研究——来自黄河“几”字弯的实证

采用全局参比Malmquist模型测算黄河“几”字弯都市圈城市2006—2021年的全要素能源利用效率,分析GML指数变化与全要素能源利用值的变化,利用三阶段中介效应模型分析城镇化、技术创新对黄河“几”字弯都市圈城市全要素能源利用效率的影响效应。研究表明:黄河“几”字弯大部分城市的全要素能源利用效率值呈现增长态势,且资源型城市高于非资源型城市,省会城市低于非省会城市;产业结构高级化是城镇化促进全要素能源利用效率的部分中介;经济增长是技术创新促进全要素能源利用效率的完全中介;降低环境污染是技术创新促进全要素能源利用效率的部分中介。黄河“几”字弯都市圈各城市应构建现代经济能源体系,加速产业升级与城市转型,建设低碳零碳负碳工程,推动技术创新与经济增长、绿色发展齐头并进。

城市居住区三维绿色空间影响空气温湿度的机制研究

以郑州市居住区为例,采用手持式路昌LM-8000四合一环境测量仪,对郑州市区中不同方位、不同高度、不同布局形式分类的6个居住区微气候环境进行观测,对气温、相对湿度等气象数据进行分析,并探讨绿色空间布局形式影响空气温湿度的机制。结果表明:居住区白天相对湿度的变化幅度高于温度;测量日内,高层小区和多层小区的温湿度达到最大值的时间不同;在静风条件下,植物蒸散和阴影影响的范围为10~50 m,相对湿度的影响范围为10~50 m;居住区相对湿度最小值、均值分别与测点10 m范围内绿色空间的分形维数有关;相对湿度最大值与50 m范围内绿色空间的形状指数有关;白天时段,湿度的变化与50 m范围内的形状指数和连接度指数有关。

基于树木望高比的材积计算方法研究

分析望高法计算树木材积的原理、适用范围,但因为望高点可能被遮挡,以及测望高效率较低问题,尝试用树高代替望高进行求积。为此,在利用既有解析木的有效数据研究形率系列(q)和形状指数(r)的基础上,提出了直接测算望高比(B)的方法,解决了测望高(h_(R))较为困难及效率较低的问题。

针片状骨料含量对沥青混凝土骨料级配的影响研究

为研究针片状骨料含量对沥青混凝土骨料级配的影响,本文采用逐级填充法,选用骨架稳定性为衡量骨架级配优劣的唯一指标,考虑针片状含量为0%、20%、25%、30%、35%,利用垂直振动压实仪成型试件。结合加州承载比(CBR)值、骨架密度与空隙率综合评价骨架稳定性,以此确定各组粗骨料级配。采用合成级配的设计方法,将粗细集料进行全粒径骨料级配设计。结果表明,随着针片状骨料含量的增加,全粒径骨料骨架稳定性呈现先增后减的趋势,其中针片状骨料含量为30%的骨架稳定性最优,针片状骨料含量35%的稳定性最劣。

变负载下柔性系统的改进THEI输入整形器振动抑制

针对高精度运动平台中柔性系统负载改变而导致的固有频率和阻尼比双参数共同变化下输入整形器不敏感性优化问题,提出一种改进双股峰EI(two-hump extra-insensitive,THEI)输入整形器的设计方法,实现在相同滞后时间的前提下改善THEI输入整形器的不敏感性。该改进THEI整形器在正向设计传统THEI输入整形器的基础上,加入对双参数不敏感性的反向优化。首先,利用三维灵敏度曲线推导了用于量化THEI输入整形器双参数不敏感性的评价指标。其次,建立了以幅值调节因子为设计变量的优化脉冲约束下THEI输入整形器双参数不敏感性优化模型;基于蚁群优化(ant colony optimization,ACO)算法求解设计变量,并更新改进THEI输入整形器的脉冲幅值,实现不敏感性最优。最后,数值仿真和试验结果共同验证了所提方法的有效性。

发酵豆粕替代鱼粉对黑斑蛙生长性能、体形指数及血浆生化指标的影响

文章旨在研究发酵豆粕替代鱼粉对黑斑蛙生长性能、体形指数及血浆生化指标的影响。试验将800只同批孵化、健康、初重[(2.7±0.1)g]一致的黑斑蛙随机分到20个养殖试验池中,每5个试验池为一组,试验组分别使用0%、10%、20%、40%的发酵豆粕替代基础日粮中的鱼粉,试验为期60 d。结果表明,使用20%和40%的发酵豆粕替代基础日粮中的鱼粉显著降低黑斑蛙6.80%和7.49%的末体重(P<0.05);黑斑蛙的增重率分别显著降低7.84%和7.44%(P<0.05);黑斑蛙的特定生长率分别显著降低3.05%和2.89%(P<0.05);此外,发酵豆粕对黑斑蛙成活率、摄食率和饲料系数均无显著影响(P>0.05)。使用20%和40%的发酵豆粕替代基础日粮中的鱼粉可显著降低黑斑蛙的肥满度和肝体比(P<0.05);使用20%和40%的发酵豆粕替代基础日粮中的鱼粉可显著降低黑斑蛙的胴体比(P<0.05);此外,日粮添加发酵豆粕对黑斑蛙后腿指数和器官指数均无显著影响(P>0.05)。使用20%和40%的发酵豆粕替代基础日粮中的鱼粉可显著降低黑斑蛙血浆TG和HDL含量(P<0.05),显著提高黑斑蛙血浆TC含量(P<0.05);此外,使用发酵豆粕替代基础日粮中的鱼粉对黑斑蛙血浆LDL含量、AST和ALT活性均无显著影响(P>0.05)。结论:使用发酵豆粕替代鱼粉(20%和40%)对黑斑蛙生长性能有显著负面影响,在本试验条件下最适替代量为10%。

‘京白梨’果形及果重差异影响因素分析

为解决‘京白梨’品质退化的问题,以北京地区‘京白梨’结果树为试材,比较不同秋子梨授粉品种、坐果序位和立地条件(丘陵和平地果园)对‘京白梨’果形和果重的影响。结果表明,利用‘子母梨’、‘山梨’、‘鸭广梨’、‘金香水’和‘寒红’分别给‘京白梨’授粉,‘山梨’、‘寒红’授粉效果最佳,获得的‘京白梨’果重分别为113.60、110.80 g,果形指数均为0.82;3~5序位坐果率高、果重大,优于1~2序位和6~9序位坐果;山地丘陵果园‘京白梨’果重100.77 g、果形指数0.82,而平地果园果重125.08 g、果形指数0.87,果形指数受立地条件影响。综上所述,为保证‘京白梨’果形的典型性,可配置‘山梨’和‘寒红’为授粉品种,疏果保留3~5序位,并在冷凉山区环境种植。

冷轧机仿真分析及板形控制

为进一步提升板带材的质量,尤其是其平直度和几何尺寸的精确性,以六辊式冷轧机为研究对象,在对其基本结构分析的基础上构建了三维模型和有限元仿真模型,结合其轧制基础工艺参数,重点对弯辊技术和板形宽度对板形的影响进行仿真分析。结果显示:工作辊弯辊力为280 kN、中间辊弯辊力为250 kN以及板形宽度为900 mm时,所得轧件的平直度及光滑度效果最佳,为相关研究成果及实践生产提供了理论参考。

不同施肥处理对5年树龄不同澳洲坚果品种果实发育的影响

为探究5年树龄澳洲坚果最优配方肥施肥量。试验以JW、OC、桂热1号和695等5年树龄结果树为研究对象,通过对花芽分化期、开花期、坐果期、果实膨大期和硬核期等不同果实发育期,施用配方肥,分析不同配方肥对不同品种5年树龄果实生理指标的影响。结果表明,配方肥T5处理组合配比,增产效果较好。在实际生产中,产量随着不同时期配方肥施用量的增加而增加,与施肥量呈正相关。合理科学施肥,澳洲坚果青果会变大,单果重明显提高,果形变得更加圆润,果皮会变薄,鲜种质量有增加,能促进澳洲坚果产量提升。

管壳式换热器弓形折流板的结构优化

为研究某高温烟气急冷器空气二次冷却系统的流动与传热特性,建立了管壳式换热器简化模型,运用ANSYS软件进行数值模拟,分析了折流板数量、相对缺口高度、折流板间距和换热器进出口管布置方式对换热器性能的影响。结果表明:折流板数量越多,相对缺口高度越小,换热器压降越大,换热系数越大,综合性能指标越小;高温区域折流板间距小、低温区域折流板间距大的换热器比等间距折流板换热器平均换热系数提高了4.3%,平均综合性能指标提高了2.3%;空气出口管布置在热流体进口侧比布置在热流体出口侧平均换热系数提高了6.5%,平均综合性能指标提高了4.3%。

基于Alpha Shape算法的分散式乡村聚落形状划分及其形成研究——以米脂县龙镇为例

为了定量划分分散式乡村聚落的形状类型并探究其形成原因,以陕北黄土丘陵沟壑区米脂县龙镇为例,尝试使用Alpha Shape算法对聚落形状进行提取,通过Boyce-Clark指数计算并划分聚落形状类型,最后结合多元线性回归和回归树的方法探究影响聚落形状的因素。结果表明:100 m滚动半径下,Alpha Shape算法能够提取76.1%聚落的精确轮廓;研究区乡村聚落形状类型可以分为块状矩形及其变种、延伸形、哑铃形和串珠形、带状矩形及其组合、线形5种,Boyce-Clark指数依次增加;高程和Boyce-Clark指数呈显著正相关,水资源可获取性与Boyce-Clark指数在高海拔地区呈负相关,聚落面积与Boyce-Clark指数先呈负相关后呈正相关。研究结果可为分散式聚落生活空间边界的划定提供参考,增进对黄土丘陵沟壑区分散式聚落形态的认识。

高含水期油藏剩余油聚集度表征方法

剩余油聚集度是评价高含水期油藏开发效果及开发潜力的重要指标。通过剩余油储量丰度,确定油藏优势储量区;利用单块面积、分布密度和形状指数,通过熵权法确定各指标的权重,最终形成剩余油聚集度的表征。研究表明,对于一个稳定开发的油藏,开发过程中剩余油的离散与聚集可分为一次离散阶段、迅速分离阶段、波动聚集与离散阶段和二次离散阶段。利用表征指标对大港油田港东开发区二区七断块Nm3-4-1小层进行评价,该小层剩余油聚集度随着开发的进行稳步下降,现阶段由于注采结构和井网调整,剩余油聚集度开始上升。