用有机掺杂硅酸盐法制备稳定的pH传感膜

采用溶胶-凝胶法制备基于染料吸收原理的光纤化学pH传感膜.通过有机掺杂,获得了对溶液pH具有宽范围动态响应的敏感膜.将四乙氧基硅烷和有机硅单体水解后加入pH指示剂,铺成溶胶-凝胶薄膜.该pH传感器的pH感应范围可达到pH3～11,响应速度3 min,一个月稳定性在RSD＜18%.     

电渣重熔冷轧辊钢锭锻造过程探讨

本文探讨6×6M1Φ钢电渣重熔钢锭锻造轧辊工艺参数〔1〕。硅钢制造业规定此钢用做工作辊直径130-152毫米、长700-1700毫米的多辊轧机的轧辊,以取代以往采用的9     

A comparison of distribution and composition of intramuscular fat in Duroc Jersey and Hampshire pigs at 100 kg liveweight

The intramuscular fat content, its fatty acid composition and that from the triglyceride fraction, were determined in several muscles from the right sides of four Duroc Jersey and four Hampshire castrated male pigs slaughtered at 100 kg liveweight. The Hampshires had heavier muscles than the Duroc Jersey pigs, but did not show significant differences in the percentages of intramuscular fat. The concentrations of linoleic acid were, in general, higher in the Hampshire than in the Duroc Jersey pigs and in many muscles the differences were highly significant (p < 0·05) The concentrations of linoleic acid (18:2) in the triglyceride fraction did not differ among muscles within breeds but were higher in Hampshire than in Duroc Jersey pigs.     

基于FEM-SVM的大坝可靠度分析方法

为解决复杂大坝可靠度分析计算时难以求得显示的功能函数和传统随机有限元计算时间长、工作量大等问题,提出将有限元(FEM)、支持向量机(SVM)和Monte-Carlo法相结合的可靠度分析方法,即采用正交试验设计具有代表性的样本点,通过有限元计算生成学习样本,利用支持向量机具有解决高度非线性、小样本问题的能力,建立结构响应量和输入变量的映射关系,再利用Monte-Carlo法,结合输入变量的概率分布生成随机样本进行结构可靠度计算。实例计算表明,FEM-SVM分析方法具有较好的精度,同时大幅减少了计算时长和工作量。     

National Strategy on Intellectual Property Rights to Be Launched This Year

Ms. Chen Zhili, a State Councilor,expressed on the Glooal Forum on Intellectual Property Rights Protection and Innovation that a plan on the preparation of China's strategy on intellectual property rights would be issued and put into implcmentation this year, in an effort to jointly create a harmonious environment in which dialogue instead of confrontation will prevail.. At the forum, Mr.     

近期国内乙烯项目扩建消息

20 0 0年 12月 8日 ,改造后的中原 180ｋｔ/ａ乙烯装置生产出合格乙烯 ,标志着由中原乙烯 140ｋｔ/ａ改扩为 180ｋｔ/ａ的乙烯改造取得圆满成功。该工程总体改造投入为 3.6亿元人民币 ,按目前产品售价计算 ,每年可实现 5～ 6亿元人民币的销售收入 ,其重大设备供应首次由国内承担 ,是中国石化集团公司小乙烯改造的三大试点之一 ,对其它小乙烯改造具有示范作用。国家发展计划委员会批准了福建 6 0 0ｋｔ/ａ乙烯项目建议书。该项目包括建一套 6 0 0ｋｔ/ａ乙烯装置、一套 45 0ｋｔ/ａ聚乙烯装置和一套 30 0ｋｔ/ａ聚丙烯装置 ,总耗资为 133亿元…     

Isolation and sequence of the MIG1 homologue from the yeast Candida utilis

The Mig1p repressor from the food yeast Candida utilis has been isolated using a homologous PCR hybridization probe. This probe was amplified with two sets of degenerate primers designed on the basis of highly conserved motifs in the DNA-binding region (zinc-finger domain) from yeast Mig1p and fungi CreA repressors. The cloned gene was sequenced and found to encode a polypeptide of 345 amino acids which shows significant identity with other yeast and fungus repressors in the DNA-binding domain and also with the yeast Mig1 proteins in the C-terminal region (effector domain). The MIG1 repressor gene from C. utilis was able to complement functionally the mig1 mutation of S. cerevisiae. The sequence presented here has been deposited in the EMBL data library under Accession No. AJ277830.     

Nutritional and sensory quality of porcine raw meat, cooked ham and dry-cured shoulder as affected by dietary enrichment with docosahexaenoic acid (DHA) and α-tocopheryl acetate

The effects of dietary enrichment of pig diets with DHA from a marine source (Algatrium^®) and α-tocopheryl acetate on the nutritional and sensory characteristics of pork and pork products were evaluated. Raw and cooked hams, and dry-cured shoulders from pigs fed with three diets (control, control supplemented with 0.3% DHA plus 50 ppm α-tocopheryl acetate and control with 200 ppm α-tocopheryl acetate) were used. The treatments did not cause any significant differences in proteolytic and antioxidant enzyme activities, except on catalase (CAT) which increased significantly in raw hams from pigs fed DHA supplemented diets. Vitamin E accumulated in samples with α-tocopheryl acetate supplementation. DHA added to the diet increased the DHA level by 87% compared with the control treatment in both raw and dry-cured shoulders, and exceeded 82% in cooked hams. In consequence, the incorporation of the n − 3 source in the diet significantly reduced the n − 6/n − 3 ratio in all products. The ratio reduction ranged from 51% in dry-cured shoulders to 65% in cooked and raw hams.     

Land inputs of trace metals, major elements, particulate organic carbon and suspended solids to an industrial coastal bay of the NE Atlantic

Rivers, streams and municipal and industrial effluents flowing into the Ferrol Ria (NW Spain) were analyzed for dissolved and particulate trace elements (Cd, Cu, Pb, Zn), particulate major elements (Al, Fe, Si), particulate organic carbon and nitrogen (POC and PON), and total suspended solids. Trace metal clean techniques were applied. Mean annual fluxes of these components were calculated. Dissolved trace metal concentrations in the major freshwater inputs were found to be within typical values for uncontaminated rivers: Cd: 0.020-0.035 nM; Cu: 11.7-19.2 nM; Pb: 0.40-0.71 nM and Zn: 18-54 nM. Two sources of suspended particulate matter (SPM) were observed: (i) a detrital SPM, which becomes more important at high river discharges, with metal concentrations tending to lithogenic values; (ii) an organic- and metal-rich SPM, which becomes dominant at low discharges. Municipal and industrial effluents in the northern shore, despite of constitute a minor freshwater contribution to the bay, were responsible for more than 50% of total inputs of Cu, Cd, Pb, Zn, POC and PON. The fluxes of trace metals obtained for the Ferrol Ria are in the range of other inhabited world semi-enclosed embayments.