Study on the Purity of Gold Leaf in a SO2 Atmosphere at Ambient Temperature

Gold leaf samples of different purities were corroded in a SO₂ atmosphere at three different relative humidities (30%, 60%, 90%) at ambient temperature, and the effects on color, gloss, and morphology were studied. Results showed that a corrosion rate of 0.0898 g/cm² could be attained after 6 weeks at high humidity. Color changes also occurred during the gold leaf corrosion process, and many thin pits formed on the surfaces, as shown by SEM. EDX results showed that these pits contained C, O, and S compounds. By comparing the results of different gold purity samples and different relative humidity conditions, it could be concluded that both gold content and humidity play an important role in SO₂ atmosphere corrosion. These conclusions are helpful for the conservation of gold leaf decorative cultural relics.     

儿科护士组织气氛与工作沉浸的相关性研究

[目的]对儿科护士感知的组织气氛与工作沉浸的相关性进行研究。[方法]应用护士组织气氛感知量表和护士工作沉浸问卷对131名儿科护士进行调查,应用多元逐步回归分析、相关分析法探讨两者之间的关系。[结果]儿科护士工作沉浸和组织气氛得分均处于中等水平,组织气氛与工作沉浸呈正相关(P <0.01);管理支持、团队行为、资源保障、质量管理是工作沉浸的重要预测变量。[结论]护理管理者应采取有效措施提高组织气氛,以提升护士的工作沉浸水平。     

Reactive and nonreactive quenching of O(1D) by the potent greenhouse gases SO2F2, NF3, and SF5CF3

A laser flash photolysis–resonance fluorescence technique has been employed to measure rate coefficients and physical vs. reactive quenching branching ratios for O(¹D) deactivation by three potent greenhouse gases, SO₂F₂(k₁), NF₃(k₂), and SF₅CF₃(k₃). In excellent agreement with one published study, we find that k₁(T) = 9.0 × 10^-11 exp(+98/T) cm³ molecule^-1 s^-1 and that the reactive quenching rate coefficient is k_1b = (5.8 ± 2.3) × 10^-11 cm³ molecule^-1 s^-1 independent of temperature. We find that k₂(T) = 2.0 × 10^-11 exp(+52/T) cm³ molecule^-1 s^-1 with reaction proceeding almost entirely (∼99%) by reactive quenching. Reactive quenching of O(¹D) by NF₃ is more than a factor of two faster than reported in one published study, a result that will significantly lower the model-derived atmospheric lifetime and global warming potential of NF₃. Deactivation of O(¹D) by SF₅CF₃ is slow enough (k₃ < 2.0 × 10^-13 cm³ molecule^-1 s^-1 at 298 K) that reaction with O(¹D) is unimportant as an atmospheric removal mechanism for SF₅CF₃. The kinetics of O(¹D) reactions with SO₂ (k₄) and CS₂ (k₅) have also been investigated at 298 K. We find that k₄ = (2.2 ± 0.3) × 10^-10 and k₅ = (4.6 ± 0.6) × 10^-10 cm³ molecule^-1 s^-1; branching ratios for reactive quenching are 0.76 ± 0.12 and 0.94 ± 0.06 for the SO₂ and CS₂ reactions, respectively. All uncertainties reported above are estimates of accuracy (2σ) and rate coefficients k_i(T) (i = 1,2) calculated from the above Arrhenius expressions have estimated accuracies of ± 15% (2σ).     

和谐共处 人瘤共存

中医治疗以人为本,扶助正气,调理脏腑,达到人“瘤”平衡,带“瘤”生存的状态,提高患者的生活质量和延长生存时间。     

构筑研究性实验教学创新氛围的探索和实践

在研究性实验教学中,从树立实验教学的创新理念和加强实验室建设、注重实验教学内容与科研和社会实践相结合、实验队伍建设等三大方面,分层次、多模式、科学系统地构筑良好创新氛围。     

浅析大气大气下陷论

大气不同于宗气、中气等,乃诸气之宗主,为它气之上较高功能层次的气,是保持人体阴阳平衡和治疗各种疾病的关键之大气。历代医家对其认识略有差异,其沿革发展受到传统儒学思维方法的影响,经自然与人体的关系论及自然对疾病的影响演变后由张锡纯提出大气下陷致病的理论,对后世医者影响颇深。通过对大气学说的来源、含义及大气下陷论的探究后,认为大气下陷涵盖有大气因虚无力升提而下陷;大气不虚而无升提之势下陷者及大气因痰、瘀、邪等凝滞而无法升提者等三层含义。     

Development of in-vitro-derived bovine embryos cultured in 5% CO2 in air or in 5% O2, 5% CO2 and 90% N2

To evaluate the effects of a three gas mixture of 5% O2, 5% CO2 and 90% N2 (OCN) on preimplantation embryo development, bovine in-vitro fertilization (IVF) oocytes were cultured in a defined medium (mBECM) with various supplements either under 5% CO2 in air or under OCN. When cultured in mBECM alone, embryo development was significantly stimulated in OCN compared to 5% CO2 in air (experiment 1). In the OCN atmosphere, blastocyst formation was further increased after addition of fetal bovine serum (FBS; 10%) or FBS + cumulus granulosa cells (CGC) to mBECM. The ratio of blastocysts to 8-cell embryos, number of hatched blastocysts and embryo diameter were markedly increased, and zona thickness was decreased after FBS addition. However, development up to the morula stage was fully supported by mBECM alone. There was no significant effect of beta-mercaptoethanol (ME; 10 microM) in OCN. In the 5% CO2 atmosphere, embryo development was significantly (P < 0.05) enhanced after addition of FBS + CGC + ME. In experiment 2, in OCN, FBS added at 60 h post-insemination was effective in stimulating blastocyst formation, but changes in medium volume per oocyte from 13.6 to 1.36 microliters had only a marginal effect. In conclusion, OCN gas mixture provides a suitable atmosphere for early embryo growth in vitro and mBECM + FBS in the optimal culture medium under this atmosphere.     

云南省罗平医院人际氛围评价

良好的人际氛围,能有效地提高组织绩效。本次研究对云南罗平医院员工的人际沟通能力和医院内聚力进行了调查,并依据分析结果提出建议与对策。     

真空预冷结合减压贮藏保鲜水蜜桃

对无锡水蜜桃进行了不同过程的真空顸冷后，进行三阶段减压贮藏保鲜试验，同时以不顸冷直接进行三阶段减压贮藏和常压冷藏为对照试验，结果表明，在减压条件下水蜜桃真空顸冷的效果不明显，其各项生理生化变化与不预冷直接进行三阶段减压贮藏无明显差异，而三阶段减压贮藏则明显优于常压冷藏。     

加强高校学风建设的思考

高校学风建设是一项具有战略意义的人才工程,是构建和谐校园的重要条件。高校要以创建优良校风为目标,以促进大学生成长成才为重点,积极探索学风建设的新途径、新方法。加强思想政治教育,加强专业素质教育,加强校园文化建设,建立健全学生管理制度,并深入开展调查研究,是促进高校学风建设的有效途径。