Materials Literature
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The Ag(I) atom in the polycationic salt, {[Ag(C(11)H(11)N(3)O)]NO(3)}(n), shows a linear coordination [N-Ag-N = 175.0 (2)°]; the polymeric nature arises from bridging by the pyrazine portion of the ligand, resulting in chains extending parallel to [100]. The NO(3) (-) counter-ions surround the polymeric chain and inte…
We investigate the thermal stability of helical hydrophobic oligomers using a three-dimensional, water-explicit lattice model and the Wang-Landau Monte Carlo method. The degree of oligomer helicity is controlled by the parameter ε(mm) < 0, which mimics monomer-monomer hydrogen bond interactions leading to the formatio…
In the title compound, C(20)H(18)ClN(3), the cyclo-octene ring exhibits conformational disorder of two methyl-ene groups with a site-occupation factor of 0.859 (6) for the major occupied site. In the crystal, mol-ecules are connected into inversion dimers via pairs of weak N-H⋯N hydrogen bonds, forming an R(2) (2)(12)…
Emergent Features (EFs) are properties that are not possessed by any individual part, but arise only from the configuration of parts. They are furthermore processed more quickly than are the properties of the parts, and the presence of EFs makes configurations more salient than their parts. Converging evidence from tw…
Phosphate in the CoPi water-oxidation catalyst is shown by NMR spectroscopic studies to exist as mobile interlayer ions. This is consistent with the idea that the catalyst has a layered-double-hydroxide-like structure and can accept a wide range of interlayer proton shuttles. For more information, see the Communicatio…
O objetivo deste estudo foi analisar as respostas biológicas `a materiais utilizados em Endodontia que apresentam na formulação Mineral Trióxido Agregado (MTA) ou cimento Portland (PC) utilizando sistemas de cultura de células. O estudo foi dividido em três capítulos: No capitulo 1 foram avaliados bioatividade e bioco…
在298.15 K下采用现代微量热技术监测了微乳液法原位合成MnMoO 4 ·H 2 O纳米棒过程中能量变化的微量热曲线. 该曲线显示, 反应开始瞬时放热, 有一个尖锐的放热峰, 在随后的过程中分别出现一个强的吸热峰和放热峰. 通过X射线粉末衍射仪(XRD)、 场发射扫描电子显微镜(FESEM)和透射电子显微镜(TEM)等对MnMoO 4 ·H 2 O纳米棒的结构、 形貌及尺寸进行了表征. 结合微乳液的特性和量热曲线, 讨论了MnMoO 4 ·H 2 O纳米棒生长过程中的形貌演变和热动力学信息. 整个生长过程包含微乳液的碰撞凝聚、 反应成核、 结晶和生长过程. 经计算, 反应成核过程、 晶化过程及晶体二次生长过程的速率常数分别为6…
将碳纳米管（CNTs）载体分别经混酸与硝酸蒸气预处理并在不同温度下煅烧，然后分别采用浸渍法及机械研磨法负载磷钨酸（HPW），制备出HPW／CNTs催化剂，对比考察了上述催化剂对NOx的吸附与分解效果．在空速为10000h-1、吸附温度为200℃的条件下，用0．5g催化剂对1696mg／m3的NOx进行吸附实验，结果表明，以硝酸蒸气预处理且经300℃煅烧后的CNTs为载体，采用机械研磨负载法制备的催化剂HPW／CNTs对NOx的吸附率与吸附能力最高，分别为54％与16．6mgNOx／（g·h）．对吸附NOx后的催化剂体系进行了催化分解NOx的程序升温脱附一质谱（TPD—MS）研究，结果表明，所吸附的NOx在快速升温过程中发生分解，在…
通过双(环戊二烯基)二氯化锆(Cp2ZrCl2)催化剂和改良的甲基铝氧烷(MMAO)助催化剂，合成了无机-有机杂化共聚物．研究了2种具有不同单乙烯基反应基团的笼型倍半硅氧烷(POSS)与乙烯的聚合．对共聚产物的结构、热力学性质、分子量及其分布等进行了研究．共聚单体(POSS)的插入率在0.01%～0.30%之间，随着共聚单体在共聚物中摩尔分数的增大，聚合物的熔点和熔解热降低．共聚物的热重分析结果显示，乙烯-POSS 共聚物拥有更高的热分解温度以及较高的热分解残留量．随着POSS的加入，聚合物的分子量明显提高，聚合物的分子量分布变宽．
Автором разработано новое направление в моделировании стержневых и континуальных систем при расчете на статические и динамические нагрузки, а также на устойчивость: для исследуемого объекта синтезируется электронная модель, анализируемая далее не с помощью специализированной аналоговой вычислительной техники, а с испо…
采用浸渍法制备了以羟基磷灰石(HAP)载型水溶性铑络合物HRh(CO)(TPPTS) 3 /HAP催化剂(TPPTS=三苯基膦三间磺酸钠), 采用傅里叶变换红外光谱(FTIR)、 固体核磁共振波谱( 31 P CP-MAS NMR)、 扫描电子显微镜(SEM)、 电感耦合等离子发射光谱(ICP-OES)和比表面积测定(BET)等对催化剂进行了表征. 该催化剂在催化1-己烯氢甲酰化反应中表现出高活性和高选择性, 在优化条件下获得了100%的醛选择性和高转化频率(TOF=2465 h -1 ). 该催化剂还对1-己烯、 2-己烯和3-己烯表现出特殊的异构化功能. 该催化剂制备方法简单, 通过简单离心分离可以循环使用. 对HAP负载HR…
通过对聚乙烯醇(PVA)/季铵化羟乙基乙氧基纤维素(QHECE)共混膜进行聚乙二醇(PEG)聚塑化改性, 采用物理-化学交联联用法制备了PVA/QHECE/PEG碱性阴离子交换复合膜. 通过交流(AC)阻抗、 傅里叶变换红外光谱(FTIR)、 扫描电子显微镜(SEM)、 热重分析(TGA)、 气相色谱(GC)和拉伸实验等手段考察了不同PEG添加量对膜的离子电导率、 分子结构、 微观形貌、 热稳定性、 力学强度、 甲醇渗透率和耐碱稳定性等性能. 结果表明, PEG的加入(除最小比例外)提高了膜的离子电导率和力学强度并使其柔韧性增大. 同时, 膜的热稳定性比未添加PEG时提高了40℃. 将PVA/QHECE/PEG膜在80℃, 6 m…
Se propone un metodo para valorar la eficacia de un ensimaje, aplicado en el proceso de hilatura, de facil aplicacion industrial y bien correlacionado con la calidad del hilo y de los tejidos obtenidos. Metodo valido para los procesos de hilatura de fibra cortada, independientemente de su longitud de corte y de finura…
The average avalanche size can be calculated exactly in a number of models of self-organised criticality (SOC). While the calculation is straight-forward in one dimension, it is more involved in higher dimensions and further complicated by the presence of different boundary conditions and different forms of external d…
Recent advances in innovative energy storage devices such as supercapacitors have made battery-supercapacitor hybrid energy storage systems technically attractive. However the field of hybrid energy storage system control is relatively new, involving the major challenge of developing control techniques optimised for i…
This dissertation reports on the synthesis, structural and thermal characterization and electrical and thermal transport properties of a variety of strongly correlated spinels. General structure property relationships for electrical and thermal transport are discussed. However, the relationship between thermopower and…
W artykule przedstawiono wyniki badań mikrostruktury oraz odporności na utlenianie powłokowych barier cieplnych wytworzonych metodą APS. Jako podłoże zastosowano stop Rene 80. międzywarstwę stanowił wieloskładnikowy stop meCrAlY. Zewnętrzną warstwę ceramiczną stanowiły proszki tlenku cyrkonu stabilizowane tlenkami itr…
Celem pracy była ocena odporności korozyjnej złączy spawanych stopiu aluminium AW 7020 z zastosowaniem trzech rodzajów spoiwa: jednego z krzemem oraz dwóch z magnezem. W wyniku przeprowadzonych badań zaobserwowano istotne zmiany w parametrach elektrochemicznych dla poszczególnych mikroobszarów wykonanych złączy spawan…
W artykule przedstawiono wyniki badań dotyczące oceny odporności na erozję ścierną powłok natryskiwanych cieplnie. Zaproponowano koncepcje stanowiska do badań erozji ściernej umożliwiającej badania w szerokim zakresie, prędkości strugi ściernej (do 200 m/s), jak i zmiennego kąta jej padania (15÷90o). Uzyskane wyniki p…
The time series of ac conductivities is measured along the c -axis of europium nitrate crystals at low temperatures below 100 K. Nonperiodic oscillations (bursts) and anomalous behaviors in the fluctuation Δσ' of the real part σ' in the complex conductivity σ * are observed in this temperature range. The probability d…