多晶硅还原加压工艺研究

为了降低多晶硅生产成本，对多晶硅生产中的重要环节——三氯氢硅（SiHCl，）还原生成多晶硅工艺进行了改进，将还原炉操作压力由常压提高至0．6MPa，比较了加压工艺与常压工艺在多晶硅的沉积速度、沉积时间、还原反应耗电量以及多晶硅产品质量等指标上的区别。结果表明，还原炉压力由常压（0．1MPa）提高至0．6MPa、H2和SiHCl，的量之比降低至3．5—5／1、SiHCl，和H2混合气的最大流量增加至2000kg／h、平均供气量约为980kg／h时，多晶硅的沉积时间由200h缩短至100h：沉积速度由7～8kg／h提高到20kg／h，提高了150％以上；反应所需的单位耗电量也从135kWh／kgSi降到75kWh／kgSi，降幅达44％，从而大幅降低了多晶硅的生产成本；同时，产品质量也得到极大的提升。     

Monophosphorylation of cornstarch to improve its sizing properties for heat‐sensitive wool yarns at reduced temperature

Commercial cornstarch was mono‐phosphorylated to different levels of substitution in order to investigate the effect of phosphorylation on the properties of cornstarch for sizing heat‐sensitive wool yarns at reduced temperature. The influences of starch phosphorylation and sizing temperature upon apparent viscosity and viscosity stability of cooked starch paste, starch retrogradation, adhesion to wool fibers, performance of starch film, aerobic biodegradation, mechanical properties, and hairiness of sized wool yarns were evaluated. The phosphorylation level was varied from 0.021 to 0.082 in degree of substitution (DS), while the temperature considered was from 60 to 95°C. It was found that mono‐phosphorylation of starch resulted in enhanced paste stability, reduced retrogradation, strong adhesion to wool fibers, increased performances of starch film, improved mechanical properties of sized wool yarns, and decreased hairiness on surface of sized yarns even if paste temperature was lowered to 60°C. Initially increasing phosphorylation level enhanced positive effects, but excessively increasing the level was not applicable due to marked reduction in tensile strength of starch film. The phosphorylation with a DS value of 0.061 could improve the performances of cornstarch for sizing wool yarns at 60–80°C. Moreover, measurement on BOD₅/COD ratios demonstrated that the phosphorylation did not impede aerobic biodegradation of starch. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013     

1-(Pyridin-2-yl) Imine Functionalized Silica Gel: Synthesis,Characterization, and Preliminary Use in Metal Ion Extraction

A new silica gel material covalently bonded with 1-(pyridin-2-yl) imine (SiNPn) was synthesized and well characterized by elemental analysis, FT–IR, ¹³C NMR of the solid state, nitrogen adsorption-desorption isotherm, BET surface area, B.J.H. Pore sizes, thermogravimetry curves (TGA), and scanning electron microscope (SEM). The new chelating surface exhibits good chemical and thermal stability. The adsorption capabilities of this new system towards toxic metal ions (Hg²⁺, Cd²⁺, Pb²⁺, and Zn²⁺) were investigated using the batch method. The percentage limits of extraction were determined by atomic absorption measurements.     

Modified Separation Theory of Heavy Water Enrichment by Thermal Diffusion in the Cocurrent-Flow Frazier Schemes

The separation theory for heavy water enrichment from water-isotope mixture in the cocurrent-flow Frazier scheme of thermal diffusion columns, has been modified with the values of pseudo product form of concentration determined by the method of least squares method, instead of simply taking the concentration in the product form as the feed concentration performed in previous works. The results indicate that serious errors occurred for the estimation of heavy water enrichment in the previous works, especially for employing the Frazier scheme with a larger number of thermal diffusion columns.     

复合纤维改性隔膜工业化试验总结

从隔膜制备、隔膜吸附、隔膜热处理、电化性能测定等方面总结了锦西化工研究院进行的复合纤维改性隔膜工业化试验。以生产2万t／a烧碱计，采用复合纤维改性隔膜可获经济效益148．6万元／a。     

Small animal PET image super-resolution using Tikhonov and modified total variation regularisation

Positron emission tomography (PET) is an imaging procedure used mainly in the diagnosis and treatment of diseases. PET is also used in the preclinical research studies of small animals. However, researchers may have difficulty interpreting the particularly low-resolution images obtained via this procedure. This paper presents a new method of increasing the resolution of PET images through the use of super-resolution techniques. Aside from being resistant to the noise and other degradations that plague PET images, our proposed algorithm is also capable of preserving important structures (e.g. lesions). To this end, the proposed objective function includes a term based on the modified total variation model which allows the user to preserve texture and to deal with noise without incurring the artefacts that typically arise when the total variation norm is used. The present study shows the effectiveness of the method in recovering structures and details and indicates that, in most cases, it outperforms other state-of-the-art methods.     

可再生天然树脂——松香在涂料中应用前景探讨

松香是可再生资源,介绍了国内松香产量和消费结构,以及在涂料工业中传统应用情况,重点阐述了松香的加工产品在涂料合成树脂中的潜在用途,特别是可代替双酚A合成环氧树脂的重大意义。     

丙烯酸接枝改性环氧树脂的研究

用溶液聚合法制备环氧树脂，丙烯酸类接枝改性物，研究了酸量、MAA/AA的比、引发剂BPO的用量、环氧树脂型号、反应时间等对接枝率和环氧值的影响。最后研究发现：酸量与环氧树脂的质量比为1：1，MAA：AA物质的量比为0．12：0．42，环氧树脂型号为E-20，反应时间为3．5h，该条件下制备出来的接枝改性物接枝率最大，且环氧基发生开环的量较少。     

Utilization of a Biodegradable Mulch Sheet Produced from Poly(Lactic Acid)/Ecoflex?/Modified Starch in Mandarin Orange Groves

We have developed a mulch sheet made by inflation molding of PLA, Ecoflex^® and modified starch, which all have different biodegradabilities. A field test of use as an agricultural mulch sheet for mandarin oranges was carried out over two years. The mechanical properties of the mulch sheet were weakened with time during the field test, but the quality of the mandarin oranges increased, a result of the controlled degradation of the sheet. The most degradable modified starch degraded first, allowing control of the moisture on the soil. Accelerator mass spectroscopy was used for evaluation of the biomass carbon ratio. The biomass carbon ratio decreased by degradation of the biobased materials, PLA and modified starch in the mulch sheet.     

改性煤变压吸附分离煤层气中甲烷的研究

通过对中梁山改性煤样在不同流速下的穿透实验,得到了该煤样的吸附柱穿透曲线,建立了等温条件下的非线性柱动力学穿透模型,并通过MATLAB求解软件对该模型进行了数值求解。采用中梁山改性前后煤样、松藻改性煤和活性炭作为吸附剂对模拟煤层气进行变压吸附浓缩分离研究表明,对于低浓度的煤层气而言,采用中梁山酸碱改性煤样在提纯低浓度煤层气实验中优于活性炭。