新型中微孔复合分子筛的合成

以十六烷基三甲基溴化铵为模板剂，在水热条件下合成出新型中微孔复合分子筛。对合成分子筛分别进行XRD、IR和吸附脱附等温线表征，在XRD图谱上小角度衍射区和大角度衍射区同时出现较强的衍射峰，分别对应中孔和微孔物相，微孔物相为D型沸石，红外图谱显示有中孔分子筛和微孔分子筛的特征振动峰；N2吸附脱附等温线和孔径分布曲线证明分子筛包含微孔和中孔结构。     

发泡鞋底材料研究现状及发展趋势

综述了发泡鞋底材料的研究现状，并由此总结出发泡鞋底材料的发展趋势。     

新型聚醚聚氨酯微孔弹性体的研制

采用新型低不饱和度聚醚多元醇、合适的丰预聚体，合成了可用于鞋底材料的聚醚型聚氨酯微孔弹性体材料。与聚酯型和传统聚醚型鞋料相比，该新型聚醚鞋料在低温性能和耐挠曲性能方面显示出较强的优势。     

LDPE／EVA／CPE并用微孔鞋底料的研制

采用模压法研究了化学交联LPDE/EVA/CPE并用微孔鞋底料的制造方法,着重讨论了LDPE/EVA/CPE并用比,不同种类的橡胶改性剂以及发泡剂、交联剂、填充剂用量对微孔鞋底物理机械性能的影响。实验结果表明,采用国产原料CPE,当LDPE:EVA:CPE=50:30:20时,并配以超细碳酸钙20份和其他助剂,可制得性能较好的微孔鞋底材料。     

Effect of storage time and heat processing on the volatile profile of Senegalese sole (Solea senegalensis Kaup, 1858) muscle

The effect of heat treatment and the presence or absence of fish skin on the volatile composition of Senegalese sole muscle was studied. The volatile profile of Senegalese sole at different storage periods was also evaluated. All samples were analysed by HS-SPME–GC–IT/MS and subjected to sensory evaluation. As expected, cooking enhanced the production/liberation of volatile compounds. Fish with the skin present, after cooking, had higher levels of sulphur compounds, 2-nonanone, ethyl octanoate and lower contents of hexanol and heptanol than skinned fish; moreover, the samples with the skin had a better overall sensory acceptability. During storage, changes on the volatile composition of Senegalese sole samples were found. The major differences were obtained after 2 weeks of storage. Compounds such as hexanal, heptanal, octanal, decanal, (E)-2-hexenal, (E)-2-decen-1-al, (E,Z)-2,6-nonadienal, benzaldehyde, 4-ethyl-benzaldehyde, 1-penten-3-ol, heptanol and (E)-2-octen-1-ol decreased after 2 weeks of storage, and other compounds, such as 3-methyl-1-butanal, 2-methyl-1-butanal, 2-heptanone, dimethyl trisulphide, dimethyl tetrasulphide and 2-methyltetrahydrothiophen-3-one increased. These differences were confirmed by sensory evaluation. Principal component analysis was applied to the chemical data.     

从“单核”到“多核”——城市发展模式初探

主要研讨“城市核”(中心)的性质和发展,阐述“核的分裂”(建立新城市中心)的观点。就“多核”(多城市中心)的概念、意义和建设展开了论述。借助城市“核”的基本研究,探讨城市的发展模式。     

鞋底止滑性能的研究进展

论述了鞋底止滑性能的研究目的和意义以及国内外在鞋底止滑性能方面的研究现状 ,在此基础上对其发展趋势作了预测 ,有助于进一步研究鞋底的止滑性能和提高鞋子的防滑性能。     

7.63m焦炉小烟道窜漏的原因分析及解决措施

焦炉小烟道发生窜漏会影响焦炉使用寿命并破坏焦炉正常加热,需要及时解决。对7.63 m焦炉小烟道窜漏产生的原因进行了分析,并有针对性地采取了一些特殊调节手段,取得了较好效果。     

Softer, higher-friction flooring improves gait of cows with and without sole ulcers

We studied dairy cows (n = 30) walking on concrete and on a soft, high-friction composite rubber surface to examine how flooring influenced gait and how this differed for cows with hoof lesions. Cows had hooves trimmed 9 wk after the trial and were classified as either with or without sole ulcers. Video recordings of the cows while walking were digitized using motion analysis software to calculate stride variables (length, height, overlap, duration, proportion of triple support, and speed). Gait was scored by a subjective scoring system (1 = sound to 5 = severely lame) and by a continuous visual analog scale for each of 7 gait attributes. Cows with sole ulcers walking on a composite rubber surface had longer strides (156.9 ± 2.6 vs. 149.6 ± 2.6 cm), higher stride heights (9.7 ± 0.3 vs. 8.8 ± 0.3 cm), more stride overlap (0.4 ± 2.0 vs. −4.3 ± 2.0 cm), shorter periods of triple support (3 legs in ground contact; 68.6 ± 2.0 vs. 73.8 ± 2.0%), walked faster (1.22 ± 0.04 vs. 1.17 ± 0.04 m/s) and had lower overall gait scores (2.9 ± 0.1 vs. 3.1 ± 0.1), better tracking-up (19 ± 2 vs. 24 ± 2), better joint flexion (29 ± 2 vs. 33 ± 2), more symmetric steps (31 ± 3 vs. 36 ± 3), and less reluctance to bear weight on their legs (12 ± 2 vs. 16 ± 2) compared with walking on concrete. Similar results were found for cows without sole ulcers. Most of the subjective gait measures could distinguish between cows with and without sole ulcers, but this was not the case for kinematic measures other than stride height. Cows with higher gait scores (more severe lameness) showed the greatest improvement in stride length (r = −0.51), triple support (r = 0.59), swing duration (r = −0.44), overall gait score (r = 0.46), and reluctance to bear weight (r = 0.66) when walking on the rubber surface compared with cows with lower gait scores. These results indicate that rubber flooring provides a more secure footing and is more comfortable to walk on, especially for lame cattle.