皂河闸小水电存在问题及改造探讨

针对皂河闸水电站因长期运行造成的机电设备老化、机组效率较低等问题,对3号机进行技术改造。经过调研分析,提出改造方案,并对改造前后的经济效益进行对比分析。表3个。     

钯膜及钯膜反应器的研究进展

钯基膜具有很高的透氢速率和透氢选择性以及良好的化学和热稳定性,一直是膜技术领域的研究热点。文章综述了钯膜的透氢原理、钯膜制备方法及钯膜反应器的研究进展。重点介绍了钯膜反应器在加氢、脱氢等反应中的应用,并对钯膜反应器的发展趋势进行了展望。     

ORGANIC PETROLOGY OF POTENTIAL SOURCE ROCKS IN THE TARIM BASIN, NW CHINA

Potential source rocks in the Tarim Basin (NW China) include Cambrian-Lower Ordovician lagoonal carbonates and mudstones; Middle-Upper Ordovician platform carbonates; Carboniferous-Permian shallow-marine carbonates and mudstones; and Triassic-Jurassic continental deposits including coals and lacustrine mudstones. Our petrological observations show that the organic components in Cambrian-Ordovician deposits are mainly alginites andamorphinites with minor vitrinite-like macerals, zooclasts and solid bitumen (Type I organic matter). The organic carbon content of these rocks is 0.1–2% TOC (averaging 0.9%TOC in deeper-water fades) and they are mature to overmature in terms of oil generation.
Organic macerals in Permian-Carboniferous source rocks are dominated by alginite with minor quantities of zooclasts andexinite derived from terrestrial higher plants (mainly Type II OM with minor Types I and III). TOC contents are 0.1–1%. These rocks are mature to highly-mature in terms of oil generation.
Macerals in Jurassic-Triassic source rocks are dominated by vitrinite and inertinite, with V+I > 50% and alginite + amorphinite < 40%; exinite averages 2–5%. This organic matter type is Type III, and the sediments are immature to just mature.
We have calculated the original organic matter richness of Ordovician deposits at selected locations. The original OM content appears to have been particularly high around Lunnan (in the North Tarim Uplift), in the Central Tarim Uplift and around Tadong (in the SE Uplift). These areas are therefore suggested to have particularly high exploration potential.     

生态文明视角下的城郊型农业园规划设计——以天津华明镇赤土生态农业园为例

研究从生态文明的视角重新诠释了城郊型农业园的概念与内涵,基于对天津华明赤土生态农业园的现状基础、区位交通与资源环境的进一步分析,总结归纳与其发展相关的目标、功能、旅游及市场等方面的规划定位,提出未来城郊型农业园的发展思路,详尽阐述了空间布局与景观设计内容,以期更好地服务于我国新型城镇化建设和生态文明建设的发展目标。     

干-喷湿纺聚丙烯腈纤维拉伸工艺研究

研究了干 -喷湿纺聚丙烯腈 (PAN)初生纤维的喷丝头拉伸比和三级拉伸 (空气拉伸、DMF浴拉伸、热水和沸水拉伸、干热拉伸 )工艺中各拉伸比对纤维性能的影响。结果表明 :提高喷丝头拉伸比可明显地降低初生纤维的线密度 ,提高强度 ;三级拉伸工艺中各拉伸比的提高均有利于PAN纤维线密度的减小及其强度、声速取向度和抗张模量的提高 ;合理调配三级拉伸中各拉伸比可制得强度超过 7.0cN/dtex的PAN纤维     

The probiotic,Leuconostoc mesenteroides,inhibits Listeria monocytogenes biofilm formation

Listeria monocytogenes biofilm formation renders these cells highly resistant to current sanitation methods, and probiotics may be a promising approach to the efficient inhibition of Listeria biofilms. In the present study, three Leuconostoc mesenteroides strains of lactic acid bacteria isolated from kimchi were shown to be effective probiotics for inhibiting Listeria biofilm formation. Biofilms of two L. monocytogenes serotypes, 1/2a (ATCC15313) and 4b (ATCC19115), in dual-species culture with each probiotic strain were decreased by more than 40-fold as compared with single-species Listeria biofilms; for instance, a reduction from 5.4 × 10⁶ colony forming units (CFU)/cm² L. monocytogenes ATCC19115 in single-species biofilms to 1.1 × 10⁵ CFU/cm² in dual-species biofilms. Most likely, one of the Leuconostoc strains, L. mesenteroides W51, led to the highest Listeria biofilm inhibition without affecting the growth of L. monocytogenes. The cell-free supernatant from the L. mesenteroides W51 culture containing large protein molecules (>30 kDa) also inhibited Listeria biofilms. These data indicate that Leuconostoc probiotics can be used to repress L. monocytogenes biofilm contamination on surfaces at food processing facilities.     

一种新型LTE混合自动重传方案

针对LTE中较大TB（Transport Block）传输时占用较多时频资源且容易出现错误致使资源浪费的情况,提出了一种新型混合自动重传请求（HARQ）传输方案。新型传输方案在HARQ实体内根据TB大小对其进行分段,取消物理层的分段功能,形成单进程下多分段数据块并行传输,在需要重新传输时,仅传输接收检测出错的分段数据即可。仿真结果表明,提出的新型传输方案在系统吞吐量和平均传输次数方面明显优于传统方案。     

皂河闸小水电站水电阻的设计与应用

为了改善皂河闸小水电站的运行条件，防止因“飞车”及过电压、过电流等原因发生事故造成损失，同时也为减轻运行人员的劳动强度，皂河闸小水电站保护设计中采用水电阻装置，取得了较好的应用效果。图1幅。     

Fe2+、Co2+和Ni2+对微生物降解残余稠油产甲烷的影响研究

On the basis of single factor tests, the effect of trace elements—Fe2+, Co2+ and Ni2+ ions—on biological methane production from heavy oil was investigated by the response surface method. A three-level Box-Behnken design was employed to study the relationship between the independent variables and the dependent variable by applying initial Fe2+, Co2+ and Ni2+ concentration as the independent variables(factors) and using the methane production after 270 days of cultivation as the dependent variable(response). A prediction model of quadramatic polynomial regression equation was obtained. The results showed that the methane production could be as high as 240.69 μmol after optimization compared with 235.74 μmol obtained under un-optimized condition. Furthermore, the microbial communities before and after biodegradation were analyzed by PCR-DGGE method. The dominant bands were recovered and sequenced. Three strains were obtained; the strain T1 has 97% similarity with Bacillus thermoamylovorans, the strain H3 has 97% similarity with Bacillus thermoamylovorans and the strain H4 has 99% similarity with Bacillus vietnamensis.     

半导体冷藏箱和丙烷冷藏箱在果蔬配送中的冷藏效果

作者研究了不同配送方法对果蔬营养和品质的影响,以结球生菜、黄瓜、葡萄、芒果为研究对象,预冷后分别用丙烷冷藏箱和半导体冷藏箱冷藏配送24 h,无冷链常温配送为对照,进行感官评价和营养成分测定。结果表明：丙烷冷藏箱冷藏配送、半导体冷藏箱冷藏配送、常温配送的果蔬感官评价分别为8.3~8.7、8.2~8.6、7.1~8.0,失重率分别为0.23%~2.67%、0.28%~2.21%、0.97%~4.88%;丙烷冷藏箱冷藏配送的果蔬品质最佳,失重率最低,其结球生菜、黄瓜、葡萄、芒果的VC质量分数分别为1.09、1.48、5.65、5.54 mg/hg,可溶性固形物分别为3.4、4.17、16.2、15.44 mg/g,可溶性蛋白质分别为0.021、0.027、0.091、0.11 mg/g,营养成分保持率最高。丙烷冷藏箱和半导体冷藏箱冷藏配送的果蔬单位碳排放分别为65.4 g/kg和300 g/kg,丙烷冷藏箱的碳排放低于半导体冷藏箱。