棉花植株氮素含量与干物质积累的相关性

【目的】研究棉株氮素含量与干物质积累之间的相关性,为探寻植株氮素转化机理提供参考依据。【方法】试验设置4个不同品种,测定植株氮素含量及各器官干物质。【结果】不同棉花品种的氮素含量和干物质积累均存在一定的差异,杂交棉具有一定的生长优势;各棉花品种在营养生长阶段单株氮素的积累量与干物质积累呈显著正相关,其中天杂2号的相关系数达到了0.999 8,进入生殖阶段二者不再有相关性;氮素含量与干物质积累在蕾期以叶片最高,分别达7.26 g/hm^2和955.13 kg/hm^2,花铃期后生殖器官最高,品种以天杂2号最高,为24.64 g/hm^2和11 750.64 kg/hm^2。【结论】杂交棉在氮素和干物质积累上具有一定的优势,营养生长阶段氮素含量与干物质积累量呈线性关系,且叶片占重要比重。

The Laser Action of a Yb:CLNGG Crystal with an Efficiency Approaching Its Quantum Defect Imposed Limit

Continuous-wave laser operation is demonstrated at room temperature with a new disordered Yb:CLNGG crystal.A maximum output power of 5.05 W is generated with 7.8 W of pump power absorbed in the crystal,resulting in an optical-to-optical efficiency of 65%,whereas the slope efficiency is determined to be 92%,approaching the limit imposed by the quantum defect in the laser emission process.

Thermal Lensing Measurement and Laser Performance of End-Pumped Lightly Doped Nd:GdVO_(4) Crystal

The thermal lensing effect generated in an end-pumped lightly doped Nd:GdVO4 crystal was found to be considerably weaker than that in Nd:YVO4 having the same Nd3+ concentration. Consequently, the laser performance of Nd:GdVO4 at high pump powers over 20 W was found to be superior to that of Nd:YVO4. TEM00 mode cw radiation of 14.3 W at 1.06μm was achieved with an optical conversion efficiency of 55%, and average slope efficiency of 62%.

托伐普坦联合氢氯噻嗪治疗慢性心力衰竭的疗效及对血清Hcy、NTpro-BNP水平的影响

目的:探讨托伐普坦联合氢氯噻嗪治疗慢性心力衰竭的疗效及对患者血清同型半胱氨酸(Hcy)、N末端脑钠肽前体(NTpro-BNP)水平的影响。方法:选择2018年1月-2019年12月在我院接受治疗的94例慢性心力衰竭患者,采用抽签法分为观察组(n=47)和对照组(n=47)。对照组给予氢氯噻嗪治疗,观察组在对照组的基础上给予托伐普坦治疗。比较两组患者的临床疗效、治疗前后血清Hcy、NTpro-BNP、左室收缩末期内径(LVESD)、左心室射血分数(LVEF)、6min步行距离、层黏连蛋白(LN)、透明质酸(HA)水平的变化情况及不良反应发生情况。结果:治疗后,两组总有效率分别为93.62%,74.47%,观察组显著高于对照组(P<0.05);治疗前,两组血清Hcy、NTpro-BNP水平比较无明显差异;治疗后,两组血清Hcy、NTpro-BNP水平均较治疗前显著降低,且观察组上述指标均明显低于对照组(P<0.05);治疗前,两组LVESD、LVEF、6min步行距离水平无明显差异;治疗后,两组LVEF、6 min步行距离水平均较治疗前显著升高,且观察组高于对照组,两组LVESD水平较治疗前显著下降,且观察组显著低于对照组(P<0.05);治疗前,两组心肌纤维化指标水平无明显差异;治疗后,两组LN、HA水平均显著降低,且观察组上述指标均低于对照组(P<0.05);两组不良反应总发生率为10.64%、14.89%,组间比较差异无统计学意义(P>0.05)。结论:托伐普坦联合氢氯噻嗪治疗慢性心力衰竭的临床效果显著优于单用氢氯噻嗪治疗,可有效改善患者血清Hcy、NTpro-BNP水平,且不会增加不良反应。