炉窑的节能环保系统改造

介绍了对厂内工业炉的节能环保系统的改造，不但实现了节能降耗，而且大大改善了工厂的生态环境。     

Simultaneous oxidation of aromatic compounds using Sr-doped lanthanum manganites as catalysts

Strontium-doped lanthanum manganites, La_1-xSr_xMnO₃ (LSMO), are promising and affordable catalysts for oxidative degradation of volatile organic compounds. LSMO catalysts (x = 0, .1, .2, and .3) were prepared by the citrate-nitrate autocombustion (CNA) and coprecipitation synthesis. The phase composition was confirmed by X-ray diffraction and Rietveld refinement analysis, while the oxygen content was determined by Mohr's salt permanganate titration. Morphology and porosity of prepared catalysts was correlated to catalytic oxidation of benzene, toluene, ethylbenzene and o-xylene. It was observed that both synthesis methods yielded catalysts of similar average pore size diameter and specific surface area, but the pore size distribution differed: CNA-prepared catalysts had a multimodal pore size distribution, while the coprecipitated ones had a single maximum at 4 nm. Catalysts prepared by the CNA method have shown a higher catalytic activity in the temperature range 373–723 K, as the presence of Mn³⁺/Mn⁴⁺ mixed valences increased their reducibility.     

Tailor‐made Polymeric Membranes based on Segmented Block Copolymers for CO2 Separation

This paper reports the design of a tailor made polymeric membrane by using poly(ethylene oxide)–poly(butylene terephthalate) (PEO‐PBT) multi‐block copolymers. Their properties are controlled by the fraction of the PEO phase and its molecular weight. To explain the effect of structural changes in copolymer membranes, transport properties of four gases (CO₂, H₂, N₂, and CH₄) are discussed. After characterization, the two best copolymers are selected in order to prepare tailor made blends by adding poly(ethylene glycol) (PEG). The best selected copolymer that contained 55 wt. % of 4000 g mol⁻¹ PEO produced a blend with high CO₂ permeability (∼190 barrer), which is twice the permeability of the pure copolymer. At the same time, an enhancement of CO₂/H₂ selectivity is observed (∼13). These results suggest that the morphology of PEO‐PBT can be well controlled by the addition of low‐molecular‐weight PEG, and consequently the gas transport properties can be tuned.     

An improved method to create nitrocellulose particles suitable for the immobilization of antigen and antibody

A method is described for producing 1-3 microns sized particles of nitrocellulose (NC) which are able to absorb protein. Protein is absorbed onto preformed particles made by first dissolving a sheet of nitrocellulose paper in DMSO, and then precipitating it with sodium carbonate/bicarbonate buffer. The efficiency of binding is the same as that of an equivalent sheet of non-processed NC filter paper. Antibodies absorbed onto preformed particles are not exposed to DMSO and carbonate buffer and therefore retain a high antigen binding capacity. Antigen and antibody-absorbed NC preformed particles were used to capture antibody and antigen, respectively. Using lysis buffer, the captured antibodies and antigens were readily released from the NC particles. This makes the latter an appropriate matrix for immunoprecipitation assays either for an antigen or for specific antibody. Antigen-coated NC particles were specifically aggregated ('agglutinated') by specific antibodies and thus can be used in semi-quantitative tests.     

A review of high-frequency radar cross section analysiscapabilities at McDonnell Douglas Aerospace

Two basic types of physical-optics (PO)-based radar cross section (RCS) analysis codes have come to maturity in today's HF electromagnetic analysis environment. These are facet based and curved surface based codes. Facet codes have very fast analysis rates, while curved-surface codes are usually considered more accurate. At McDonnell Douglas Aerospace (MDA), the need for very reliable RCS results to guide the aircraft design process has led us to develop a curved surface based high-frequency code. This code is called CADDSCAT (computer-aided design drafting scattering). Various aspects of CADDSCAT's curved surface and facet based analysis capabilities are described and compared. Topics covered include the genesis of curved surface based PO techniques, a discussion of first-bounce PO computations, and multiple-bounce PO interactions. CADDSCAT's first-bounce and multiple-bounce PO algorithms include options for treating radar absorbing materials (RAM). The CPU needs for the ray-tracer algorithms, for curved and faceted models, are compared. Gap diffraction, resistive-card modeling, and sea-surface modeling are briefly discussed