不同类型肥料对重庆地区“长林”系列油茶3个品种幼树生长的影响

[目的]为获得重庆地区油茶幼树生长的最佳肥料配方,对定植后的2年生油茶“长林”系列3个无性系幼树进行为期3年的施肥试验,筛选出适宜油茶幼树生长的最佳施肥比例,为提高油茶经济效益奠定基础。[方法]设置4个处理,即每年11月施用复合肥(C_(0.5),0.50 kg/株),复合肥+油茶专用有机肥(C_(0.25)O_(0.5),无机肥0.25 kg/株,有机肥0.50 kg/株),油茶专用有机肥(O_(1),1.00 kg/株)以及空白对照(CK),测定油茶幼树的树高、地径及冠幅等指标来比较和分析肥料类型间的差异。[结果]施肥促进油茶高生长,但影响不显著(P>0.05),其中以复合肥+油茶专用有机肥效用最好,与CK相比,长林3号、长林4号、长林40号增长量分别为38.46%、10.77%、22.22%;施肥显著影响油茶地径、冠幅生长(P<0.05),以复合肥+油茶专用有机肥处理增长量最大,与CK相比,地径增长量分别为125.33%、47.76%、12.87%,冠幅增长量分别为30.30%、13.00%、46.75%。[结论]复合肥与油茶专用有机肥配施对“长林”系列油茶提质增效具有积极作用。

热敏灸联合针刀治疗脑卒中后上肢屈肌痉挛的临床研究

目的 分析热敏灸联合针刀治疗在脑卒中后上肢屈肌痉挛患者中的效果。方法 选取2021年7月至2023年6月赣州市南康区中医院收治的120例脑卒中后上肢屈肌痉挛患者,按随机数字表分为三组,每组各40例。对照组2仅行常规治疗,对照组1于对照组2基础上加以热敏灸治疗,研究组在对照组1基础上加以针刀治疗,均持续治疗1个月。对比三组临床疗效、肌张力、上肢运动功能、日常生活能力、不良反应。结果 研究组治疗总有效率优于对照组1、对照组2,肌张力改善优于对照组1、对照组2,差异有统计学意义(P<0.05);治疗前,三组上肢简化Fulg-Meyer运动功能评定(FMA)量表评分、改良Barthel指数(MBI)相比,差异无统计学意义(P>0.05);治疗第14天、治疗第28天、治疗结束后1个月,研究组上肢FMA评分、MBI高于对照组1、对照组2,差异有统计学意义(P<0.05);三组不良反应相当,差异无统计学意义(P>0.05)。结论 热敏灸联合针刀治疗可降低脑卒中后上肢屈肌痉挛患者肌张力,加速上肢运动功能恢复,改善日常生活能力,且无严重不良反应。

Effects of seasonal variation on soil microbial community structure and enzyme activity in a Masson pine forest in Southwest China

Soil microbial communities and enzyme activities play key roles in soil ecosystems.Both are sensitive to changes in environmental factors,including seasonal temperature,precipitation variations and soil properties.To understand the interactive mechanisms of seasonal changes that affect soil microbial communities and enzyme activities in a subtropical masson pine(Pinus massoniana)forest,we investigated the soil microbial community structure and enzyme activities to identify the effect of seasonal changes on the soil microbial community for two years in Jinyun Mountain National Nature Reserve,Chongqing,China.The soil microbial community structure was investigated using phospholipid fatty acids(PLFAs).The results indicated that a total of 36 different PLFAs were identified,and 16:0 was found in the highest proportions in the four seasons,moreover,the total PLFAs abundance were highest in spring and lowest in winter.Bacteria and actinomycetes were the dominant types in the study area.Seasonal changes also had a significant(P<0.05)influence on the soil enzyme activity.The maximum and minimum values of the invertase and catalase activities were observed in autumn and winter,respectively.However,the maximum and minimum values of the urease and phosphatase acid enzymatic activities were found in spring and winter,respectively.Canonical correspondence analysis(CCA)analysis revealed that the seasonal shifts in soil community composition and enzyme activities were relatively more sensitive to soil moisture and temperature,but the microbial community structure and enzyme activity were not correlated with soil pH in the study region.This study highlights how the seasonal variations affect the microbial community and function(enzyme activity)to better understand and predict microbial responses to future climate regimes in subtropical area.

基于ANSYS Workbench的电机转轴的随机振动分析

为了验证电机转轴能否承受寿命周期内的振动并正常工作,以电机转轴为研究对象,对其进行随机振动分析,基于随机振动理论,先对转轴进行模态分析,获得转轴的固有频率和振型,定义加速度谱,获得X、Y、Z方向上的应力云图。仿真结构表明,电机转轴在随机载荷作用下能够安全工作。

基于有限元法的电机机座的模态分析

介绍了有限元法模态分析的基本理论知识,并以电机机座模型为研究对象,在ANSYS Workbench中依次对机座模型添加材料、划分网格、施加边界条件,完成机座模态求解,并查看电机机座前18阶固有频率与振型云图。为进一步分析电机机座的振动与噪声提供了依据。