激光能量密度对激光诱导炽光技术测试碳烟粒径的影响

激光诱导炽光(Laser Induced Incandescence,LII)技术,由于其具有高的时间和空间分辨率,被认为是一种适合于测试碳烟浓度的技术,也可以用来测试碳烟主小球粒径。在LII测试过程中,不同激光能量密度对测试精度影响很大,高激光能量密度具有较高的信噪比,但是对于碳烟粒径测试,为了避免升华,应尽量使用低的激光能量密度。具体在利用激光诱导炽光技术推断碳烟粒径的实验中所用的低能量密度为何值,需要结合理论模型分析和实验进行确定。首先基于LII测试过程的数学模型进行了理论分析,然后在乙烯层流扩散火焰的相同位置上,测试得到了不同激光能量密度下的碳烟主小球粒径,分析确定了测试所需的最佳激光能量密度。为进一步测试碳烟的主小球粒径奠定了基础。

原发性乳腺非霍奇金淋巴瘤20例临床分析

目的：探讨原发性乳腺非霍奇金淋巴瘤（NHL）的临床特点、诊治及其预后。方法：对20例原发性乳腺非霍奇金淋巴瘤患者的临床资料进行回顾性分析。结果：20例原发性乳腺非霍奇金淋巴瘤患者中，女19例，男1例，中位年龄38岁（25～76岁），其中Ⅰ期9例（45．0％），Ⅱ期7例（35．0％），Ⅲ期3例（15．0％），Ⅳ期1例（5．0％）。1例（5．0％）为未化分型NHL，19例（95．0％）为B细胞性NHL。总的3、5年生存率分别为85．0％、65．0％，Ⅰ期＋Ⅱ期3、5年生存率分别为93．75％、81．25％。结论：原发性乳腺非霍奇金淋巴瘤的预后与分期和治疗方式有关，手术＋化疗综合治疗可获得较好疗效。

CFRP在中小学校舍抗震加固中的应用

通过对中小学校舍房屋排查鉴定,针对框架梁柱混凝土强度不足,提出采用外贴CFRP的方法进行加固处理以提高其结构的抗震性能,为此类结构采用CFRP进行抗震加固积累了经验。

The Soil Moisture and Net Primary Production Affected by CO_2 and Climate Change Using a Coupled Model

In this paper, a coupled model was used to estimate the responses of soil moisture and net primary production of vegetation(NPP) to increasing atmospheric CO2 concentration and climate change. The analysis uses three experiments simulated by the second-generation Earth System Model(CanESM2) of the Canadian Centre for Climate Modelling and Analysis(CCCma), which are part of the phase 5 of the Coupled Model Intercomparison Project(CMIP5). The authors focus on the magnitude and evolution of responses in soil moisture and NPP using simulations modeled by CanESM, in which the individual effects of increasing CO2 concentration and climate change and their combined effect are separately accounted for. When considering only the single effect of climate change, the soil moisture and NPP have a linear trend of 0.03 kg m–2 yr–1 and –0.14 gC m–2 yr–2, respectively. However, such a reduction in the global NPP results from the decrease of NPP at lower latitudes and in the Southern Hemisphere, although increased NPP has been shown in high northern latitudes. The largest negative trend is located in the Amazon basin at –1.79 gC m–2 yr–2. For the individual effect of increasing CO2 concentration, both soil moisture and NPP show increases, with an elevated linear trend of 0.02 kg m–2 yr–1 and 0.84 gC m–2 yr–2, respectively. Most regions show an increasing NPP, except Alaska. For the combined effect of increasing atmospheric CO2 and climate change, the increased soil moisture and NPP exhibit a linear trend of 0.04 kg m–2 yr–1 and 0.83 gC m–2 yr–2 at a global scale. In the Amazon basin, the higher reduction in soil moisture is illustrated by the model, with a linear trend of –0.39 kg m–2 yr–1, for the combined effect. Such a change in soil moisture is caused by a weakened Walker circulation simulated by this coupled model, compared with the single effect of increasing CO2 concentration(experiment M2), and a consequence of the reduction in NPP is also shown in this area, with a linear trend of-0.16 gC m-2 yr-2.

维生素C对铜孵育的肉鸡原代肝细胞周期及细胞膜电位的影响

为了研究维生素C对铜孵育的肉鸡原代肝细胞周期及细胞膜电位的影响,试验将全量换液24 h后的原代肝细胞分为正常对照组(Ⅰ组)和10μmol/L Cu2+(Ⅱ组)、30μmol/L Cu2+(Ⅲ组)、50μmol/L Cu2+(Ⅳ组)、50μmol/L维生素C+50μmol/L Cu2+(Ⅴ组)刺激组,于体外刺激后48小时用流式细胞仪测定各组的细胞周期及细胞膜电位。结果表明:30μmol/L和50μmol/L Cu2+能明显引起静止期肝细胞数增多,增殖期肝细胞数减少,细胞膜电位下降(P<0.05),10μmol/L Cu2+组没有出现明显变化。说明维生素C可显著抑制50μmol/L Cu2+引起的变化,对细胞具有保护作用。

The Decision of Prime and Primary Ideal

We give more efficient criteria to characterise prime ideal or primary ideal. Further, we obtain the necessary and sufficient conditions that an ideal is prime or primary in real field from the Grobner bases directly.

学习聆听:音乐理论学科教学法的革新

本文以笔者在哈佛大学音乐系教授的《表演分析》、《16世纪调式对位》、《后调性音乐分析》三门课程为例,探讨了哈佛大学本科生与研究生音乐理论学科教学中的实验性改革以及富有成效的方法,倾谈了教学心得;另外,以跨学科共建课程《聆听的艺术》为例,强调了"聆听"与"体验"在教学中所应占据的重要地位,提出了理论与实践应高度结合并形成新的融合之理念。