天然气净化厂砜胺脱硫溶液发泡原因分析及影响评价

在对砜胺脱硫溶液发泡原因分析的基础上,考察了各种杂质对脱硫溶液发泡情况的影响。结果表明,固体杂质对脱硫溶液的发泡影响显著;来自地层高矿化度水的盐类对脱硫溶液发泡影响较小,而铁化物对脱硫溶液发泡影响较大;表面活性剂和缓蚀剂对脱硫溶液的发泡均影响很大;醇类对脱硫溶液具有一定的消泡作用;微量嗯唑烷酮使泡沫稳定性增加;砜胺脱硫溶液水含量应为10％～25％,此条件下脱硫溶液具有较好的抑泡性。     

Restructured Reindeer Steak Quality as Affected by Antioxidants and Frozen Storage

Restructured steaks were fabricated from forequarter muscles from field-slaughtered Alaskan reindeer. Steaks were formulated with an antioxidant (1:1 mixture of BHA and TBHQ with a propylene glycol carrier) at 0.00, 0.01 and 0.02% of the fat and 0.5% salt. Steaks were flash-frozen, vacuum-packaged and stored at ?18°C. Instrumental and sensory testing was conducted after storage (2, 6, 10, 14, 18, 22 wk). Minimal effects occurred on moistness, greasiness, softness and chewiness. Gamy flavor intensity decreased and off-flavor intensity fluctuated with storage and antioxidant. Effects of antioxidants on color were not notable. Use of the antioxidant system is not justified by any oxidative or color effects. Frozen storage was not detrimental to restructured steak quality.     

SHW46—1．6／150／90—AⅡ（65吨）型热水锅炉研制

介绍了大型往复炉排（65t）锅炉的研制过程及一些设计经验,为今后设计制造更大自然循环热水锅炉提供了一种借鉴。     

STUDY ON THE AIRFLOW RESISTANCE IN NATURAL DRAFT COOLING TOWERS

A new approach for improving the calculation of the airflow resistance coefficient of natural draft cooling towers from the inlet to throat (4) has been presented in this paper. The suggested equations areWhere. ζ1 is the coefficient of the airflow resistance with no consideration of waterdrop in rain zone, ζ2 is the coefficient of the airflow resistance due to falling of waterdrop in rain zone, s is the rate of the inlet area to the area at elevation of the packing, q is the water loading, V0 air velocity at the packing section.     

顶部开孔组合方式对城市公路隧道自然通风的影响

利用SES模拟软件,采用数值计算方法研究了城市公路隧道采用顶部开孔的自然通风方式时隧道内的气流运动和污染物扩散的问题。根据实际隧道几何尺寸,截取1000米隧道作为算例,研究了自然通风孔布置情况对隧道内空气流动及污染物扩散的影响。结果表明:在开孔数量和总开孔面积不变的情况下,与多个通风孔集中布置时相比单个通风孔均匀布置时隧道内通风换气效果最差,隧道沿程排放污染物能力最弱;而多个通风孔集中布置时五个孔一组的通风换气效果最好,隧道沿程排放污染物能力最强。     

Antimicrobial and antioxidant activities of different propolis samples from north‐western Algeria

The aim of this study was the investigation of antimicrobial and antioxidant activities of different ethanolic extracts of propolis (EEP) collected from north‐western Algeria. Total polyphenols and flavonoids contents of extracts were measured. The UV absorption spectrum showed and confirmed their polyphenols constituents. All EEPs exerted antibacterial activity against Gram‐positive bacteria, but no effect on Gram‐negative bacteria. The minimum inhibitory concentration (MIC) of EEPs ranged from 0.01% to 2.6% v/v. The antioxidant activity was measured using ferric‐reducing power (FRAP), 1,1‐diphenyl‐2‐picrylhydrazyl (DPPH) free radical‐scavenging and ESR methods. Propolis TIA‐2 and MOH‐MAS samples showed the highest antioxidative capacity, after 35 min, while TIA‐1, NED‐TL and SFS‐SBA samples showed the highest antioxidative potential of measured EEPs, after 3 min. TIA‐2 sample showed the highest antibacterial, antioxidant activity and highest DPPH free radical‐scavenging activity as well as the highest polyphenols and flavonoids content, compared with other propolis samples.     

天然优良葡萄酒酵母发酵特性研究

以实验室保藏的16株葡萄酒酵母为供试菌株,通过模拟酒精发酵初筛获得发酵力强、产酒度高或产香好的酵母5株。以2株商品酵母为对照,采用杜氏管发酵法研究其对NaCl、SO2、酒精、酸碱、温度和高糖的耐受性。结果表明,所有菌株在SO2200～600 mg/L、葡萄糖400～600 g/L浓度范围内都能发酵产气,且在pH1.5～13.0范围内可生长,其中有5株最高耐NaCl为100 g/L以及22%vol的乙醇、2株耐温最高达70℃。葡萄酒酿造结果显示,菌株Y-6发酵酒度高于2个商品酵母,总酸和挥发酸低,且其发酵葡萄酒具有浓郁的果香且香气持久、口感协调,有望应用于特色葡萄酒生产中。     

爬山虎果实色素的提取及其性质的初步研究

对爬山虎(ParthenocissustricuspidatePlanch)果实天然红色素的提取方法及理化性质进行了初步研究,结果表明:爬山虎果实色素的最大吸收峰为528nm,表现出花青素的基本特征;以甲酸为溶剂时提取效果最好;随着pH值的变化,色素表现出多种变构体;Fe3 、Fe2 等金属离子及氧化剂H2O2对其稳定性有较大影响;该色素在较高的温度、较强的酸性及自然光照条件下都较为稳定。