Integrated missile guidance and control using optimization-based predictive control

Nonlinear Dynamics - This paper focuses on the design and implementation of optimization-based predictive control for the problem of missile interception. Due to the inherent nonlinearities of the...     

铁、锰和硼元素对厌氧微生物脱氮除磷的影响

为研究在废水处理系统中铁、锰和硼元素对厌氧微生物生长代谢的影响,采用厌氧血清瓶培养实验,确定了在不同铁、锰和硼元素的投加量下,此种厌氧微生物脱氮除磷能力的变化。结果表明,铁元素的投加量为30mg·L^-1时,除磷效果最好;锰元素的投加量不应该超过2．5mg·L^-1;而硼元素对除磷无促进作用。     

NaYbF4纳米晶浓度调节方法研究

本文采用热分解法制备了NaYbF₄纳米晶.通过TEM图像对NaYbF₄纳米晶的尺寸进行表征.根据Beer-Lambert理论建立了NaYbF₄纳米晶浓度与其光吸收度间的关系.提出了NaYbF₄纳米晶浓度调节方法,利用NaYbF₄纳米晶中Yb³⁺的吸收光谱确定溶液中NaYbF₄纳米晶的浓度,并给出了纳米晶浓度调节公式.为了检验这种浓度调节方法,对五批次NaYbF₄纳米晶样品的浓度进行调节,发现浓度调节方法非常可靠.并对调整后的浓度进行多次测量,检验此调节方法的误差,最大误差在9;.     

Atomically Dispersed Cobalt/Copper Dual-Metal Catalysts for Synergistically Boosting Hydrogen Generation from Formic Acid

The development of practical materials for (de)hydrogenation reactions is a prerequisite for the launch of a sustainable hydrogen economy. Herein, we present the design and construction of an atomically dispersed dual-metal site Co/Cu−N−C catalyst allowing significantly improved dehydrogenation of formic acid, which is available from carbon dioxide and green hydrogen. The active catalyst centers consist of specific CoCuN₆ moieties with double-N-bridged adjacent metal-N₄ clusters decorated on a nitrogen-doped carbon support. At optimal conditions the dehydrogenation performance of the nanostructured material (mass activity 77.7 L ⋅ g_metal⁻¹ ⋅ h⁻¹) is up to 40 times higher compared to commercial 5 % Pd/C. In situ spectroscopic and kinetic isotope effect experiments indicate that Co/Cu−N−C promoted formic acid dehydrogenation follows the so-called formate pathway with the C−H dissociation of HCOO* as the rate-determining step. Theoretical calculations reveal that Cu in the CoCuN₆ moiety synergistically contributes to the adsorption of intermediate HCOO* and raises the d-band center of Co to favor HCOO* activation and thereby lower the reaction energy barrier.     

中心性浆液性脉络膜视网膜病变者全血14种微量元素含量测定

用ＩＣＰ－ＡＥＳ法对中心性浆液性脉络膜机网膜病变１２例，对照健康人组１３例全血微量元素测定，发现有一些微量元素明显升高或降低，其中铬（Ｃｒ）较健康人组升高（Ｐ＜０．０５），锰（Ｍｎ）较健康人组高（Ｐ＜０．０５），均有显著性差异；钛（Ｔｉ）较健康人组降低（Ｐ＜０．００２５）．进一步研究可能对中心性浆液性脉络膜视网膜病变的发病原因、治疗等提供新的见解和有用的治疗方法．