水蒸气存在下氧化钙脱氯性能的实验研究

在一个模拟流化床反应器中, 研究160~600℃下水蒸气的存在对CaO脱除HCl的影响. 采用X射线衍射仪(XRD)分析产物成分, SEM电镜对产物进行微观结构分析, 从而分析CaO的脱氯性能. 实验结果表明:随着水蒸气浓度增加, HCl的净化效率呈现一个先下降后上升的趋势. XRD分析表明, 产物的主要成分为CaClOH, 在净化效率达到一定量时, 产物中生成了Ca(OH)_2;SEM电镜观测到中低温下产物的针状形态以及高温条件下稀松产物层的生成.

R IBLL终端LA SCAR阵列探测器PM T高压控制系统的研制

介绍了R IBLL终端LA SCAR上PM T阵列电源高压控制系统。该系统以当今工程控制中常用的微型计算机作为核心器件,采用合适的外围电路达到了对PM T阵列稳定、可靠的控制,在现场测试中取得了良好的效果。

Experimental studies of the dissociative recombination of CD3CDOD+ and CH3CH2OH2+

Aims. We determine branching fractions, cross sections and thermal rate constants for the dissociative recombination of CD3CDOD+ and CH3CH2OH2+ at the low relative kinetic energies encountered in the interstellar medium. Methods. The experiments were carried out by merging an ion and electron beam at the heavy ion storage ring CRYRING, Stockholm, Sweden. Results. Break-up of the CCO structure into three heavy fragments is not found for either of the ions. Instead the CCO structure is retained in 23 +/- 3% of the DR reactions of CD3CDOD+ and 7 +/- 3% in the DR of CH3CH2OH2+, whereas rupture into two heavy fragments occurs in 77 +/- 3% and 93 +/- 3% of the DR events of the respective ions. The measured cross sections were fitted between 1-200 meV yielding the following thermal rate constants and cross-section dependencies on the relative kinetic energy: sigma(E-cm[eV]) = 1.7 +/- 0.3 x 10(-15)(Ecm[eV])(-1.23 +/- 0.02) cm(2) and k(T) = 1.9 +/- 0.4 x 10(-6)(T/300)-0.73 +/- 0.02 cm(3) s(-1) for CH3CH2OH2+ as well as k(T) = 1.1 +/- 0.4 x 10(-6)(T/300)(-0.74 +/- 0.05) cm(3) s(-1) and s(Ecm[eV]) = 9.2 +/- 4 x 10(-16)(Ecm[eV])-1.24 +/- 0.05 cm(2) for CD3CDOD+

LFX-20型逆燃式医疗废物焚烧炉二恶英实测分析

概述我国目前医疗废物焚烧处置中的主要炉型,着重介绍LFX-20型逆燃式焚烧炉焚烧处置医疗废物的实际运行工况。在1燃室、2燃室平均温度分别为869.5℃和898.7℃条件下,对医疗废物焚烧烟气进行检测。各项常规指标均低于国标限值,二恶英检测中其质量浓度实测值为15ng/m3,相应毒性当量为0.46ngTEQ/m3,同时对医疗废物焚烧后产生烟气中二恶英和灰渣的检测结果进行了分析,焚烧后底渣体积约为焚烧前医疗废物体积的1/10,重量为原来的12%～18%,飞灰热灼减率为34.6%,并给出分析结果。

从清王朝的历史看清代中国园林的发展

清代是中国古典园林发展的极盛时期,不管是造园艺术水平还是造园数量上都达到了历史上的高潮,显示中国古典园林的辉煌成就,代表了中国古典园林艺术的精华。清王朝把中国古典园林推向高潮的同时,也为现代园林的发展奠定了基础。通过回顾和分析清代的历史,探讨了清代中国园林发展的主要特点和对中国园林的贡献。

工业化将推动缓释长效尿素的应用

<正>自1955年合成微溶性脲醛化台物(UF)以及1967年聚合物包膜肥料投入生产,缓／控释肥料的生产已有40多年的历史。自上世纪70年代以来,国内外已推出了数十种缓释、控释肥料,这些高新技术,可以较好地控制肥料养分释放速度,氮素利用率高达60％-70％,而且不受土壤类型等复杂因素的影响,被称为"21世纪的肥料"。中国科学院沈阳应用生态研究所自上世纪八十年代初在国内率先开展长效尿素的研究,在新型肥料研究开发方面取得了多项成果,其中"长效尿素的研究"获辽宁省科技进步一等奖(1988年),"长效碳酸氢铵的研制与推广"项目先后获得中国科学院科技进步特等奖、国家科技进步二等奖;"脲酶／硝化抑制剂对尿素氮行为的协同作用机理及其在缓控释肥料中的应用"成果,2002年通过了鉴定结论是:在同类研究中居于国际先进水平,部分领域达到国际领先水平。研究的"复方长效尿素"获得了国家发明专利。

以管道理论为基础的林带小钻杨树体结构分析

以管道理论为基础,运用主轴切割的方法,论述不同年龄小钻杨树体的结构特点。结果表明:树干生物量增加与高度的降低呈线性关系;同一层次内的叶量和枝量间存在显著的线性关系,其关系的确定性不受分层方式的影响;树冠不同层次内的累积叶量与支持的枝干总质量存在显著的线性关系;不同层次的总累积生物量与各层内的树干生物量密度之间的线性关系显著,对不同层次累积树干生物量与各层树干生物量密度进行指数回归,系数介于1.1~1.3,指数介于1~2,表明二者的关系是处于线性和指数关系之间的一种形式;在胸高以上,树干边材断面积与侧枝基部断面积总和呈线性关系,胸高之下线性关系不存在。建立不同年龄小钻杨边材与所支持叶量的树体管道模型,同时测得胸径(D1.3)与心材直径(Dx)间的关系为Dx=0.522 exp(0.169 8D1.3),r=0.984 8。

data transformation and attribute subset selection: do they help make differences in software failure prediction?

IEEE, IEEE Comp Soc, Tech Council Software Engn

Composites of poly(lactide-co-glycolide) and the surface modified carbonated hydroxyapatite nanoparticles

To improve the mechanical properties of the composites of poly(lactide-co-glycolide) (PLGA, LA/GA = 80/20) and the carbonate hydroxyapatite (CHAP) particles, the rice-form or claviform CHAP particles with 30-40 nm in diameter and 100-200 nm in length were prepared by precipitation method. The uncalcined CHAP particles have a coarse surface with a lot of global protuberances, which could be in favor of the interaction of the matrix polymer to the CHAP particles. The nanocomposites of PLGA and surface grafted CHAP particles (g-CHAP) were prepared by solution mixing method. The structure and properties of the composites were subsequently investigated by the emission scanning electron microscopy, the tensile strength testing, and the cell culture. When the contents of g-CHAP were in the range of 2-15 wt %, the PLGA/g-CHAP nanocomposites exhibited an improved elongation at break and tensile strength. At the 2 wt % content of g-CHAP, the fracture strain was increased to 20%) from 4-5% for neat PLGA samples. Especially at g-CHAP content of 15 wt %, the tensile strength of PLGA/g-CHAP composite was about 20% higher than that of neat PLGA materials. The tensile moduli of composites were increased with the increasing of filler contents, so that the g-CHAP particles had both reinforcing and toughening effects on the PLGA composites. The results of biocompatibility test showed that the higher g-CHAP contents in PLGA composite facilitated the adhesion and proliferation properties of osteoblasts on the PLGA/g-CHAP composite film.

Electrochemical study of 4-ferrocene thiophenol monolayers assembled on gold nanoparticles

In this paper, 4-ferrocene thiophenol was employed as a novel capping agent to synthesize electroactive gold nanoparticles. Transmission electron microscopy showed an average core diameter of 2.5 nm. The optical and electrochemical properties of the 4-ferrocene thiophenol capped gold nanoparticles were characterized by UV-Vis spectroscopy and cyclic voltammograms. Surface plasmon absorbance was detected at 522 nm. Cyclic voltammograms revealed the adsorbed layer reaction controlled electrode process, and the formal potential of electroactive ferrocene centers shifted anodically compared with ferrocene in solution, which could be attributed to the electron-withdrawing phenyl moiety linked to ferrocene.

Self-assembly of 4-ferrocene thiophenol capped electroactive gold nanoparticles onto gold electrode

Gold nanoparticles capped by 4-ferrocene thiophenol with an average core size of 2.5 nm and surface plasmon absorbance at 522 nm were place-exchanged with 1,8-octanedithiol, and then self-assembled onto the gold electrode via tail SH group. The self-assembly was characterized by X-ray photoelectron spectroscopy. Cyclic voltammograms examined the coverage fraction of the self-assembled monolayers of the electroactive gold nanoparticles and the formal potential of the indicated SAMs. Further experiments exhibited that the electrode process was controlled by surface confined faradic reactions.