共查询到20条相似文献，搜索用时 203 毫秒
1.
《福建工程学院学报》2016,(3)
脱氮硫杆菌作为自养反硝化菌的代表菌种,由于其不同于常规废水脱氮的异养反硝化过程可节省碳源而得到关注。文章介绍脱氮硫杆菌的反硝化功能基因和主要的硫氧化功能基因,分析自养反硝化菌的群落分布特征,对目前脱氮硫杆菌的检测方法和应用现状进行综述,讨论目前研究中存在的问题及今后的研究趋势,以期为进一步研究自养反硝化菌群落结构提供参考。 相似文献
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AAO工艺出水pH值偏酸问题分析及对策 总被引：1，自引：0，他引：1
某污水处理厂AAO工艺出水存在着pH值偏低的问题。通过对比历史数据和缺氧反硝化试验,研究了以进厂污水作为碳源的反硝化脱氮的能力及碳氮比对脱氮的影响,并通过碱度平衡核算,分析了硝化和反硝化段的情况,查找出了出水碱度不足pH偏酸的原因,提出了快捷、行之有效的控制方案。 相似文献
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AK新型短程反硝化除磷脱氮工艺的反硝化除磷段活性污泥中分离到几株以亚硝酸盐为电子受体的反硝化除磷菌,并优选出代表菌株F10,通过菌落形态、生理生化特性、细胞培养特征以及16SrDNA序列同源性分析,鉴定为鞘氨醇杆菌属（Sphingobacterium）。通过间歇培养实验考察该菌的关键生长影响因子,表明亚硝酸盐浓度为15mg／L、pH值7．0左右、温度30℃的条件下该菌可以获得最佳生长。 相似文献
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介绍了采用水解（H）-曝气生物处理（O）-脱氮（R）-监护（M）工艺流程降解有机污染物，尤其是脱氮的效果。实验表明，水解（H）-曝气生物处理（O）-脱氮（R）-监护（M）工艺流程能很好的降解有机物，并具有较好的脱氮效果。考察了影响反硝化效果的因素。提出改善碳源质量，合适的碳氢比对反硝化效果有较大的影响。 相似文献
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以采自温州西片污水处理厂曝气池的活性污泥样品中分离获得的好氧反硝化施氏假单胞菌（Pseudomonas stutzeri）WZUF25 研究对象,分析其在最适宜条件下在人工NO3^--N 污水中菌体生长和去除NO3^--N 进程及反硝化占总氮去除率;采用海藻酸钙-活性炭包埋法固定Pseudomonas stutzeri WZUF25,研究固定化细胞在最适宜条件下去除NO3--N 进程和完整性.研究得出：Pseudomonas stutzeri WZUF25的脱NO3^--N 能力明显比目前报道的好氧反硝化菌强,其海藻酸钙-活性炭固定化细胞去除人工NO3^--N污水的过程中,固定化胶珠是完整的. 相似文献
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在反应器挂膜启动阶段和运行阶段投加好氧反硝化菌纯培养物,进行生物强化反硝化研究。结果表明,在反应器启动过程中投加好氧反硝化菌,可缩短系统的启动时间;在反应器运行过程中间歇投加好氧反硝化菌能提高系统对污染物的去除效果,同时可增强系统处理的稳定性。 相似文献
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焦化废水脱氮技术有物理化学法、生物化学法等.生物化学法是较为经济、实效、无污染转移、操作简便易掌握的典型工艺技术.生物脱氮是利用微生物的生物化学作用,将废水中的氨氮经硝化和反硝化反应,转变成为无害的氮气而除去.目前,国内焦化废水处理采用的生物化学脱氮工艺的主要流程有“缺氧一好氧(A—O)”法,以及在此工艺基础上开发的“厌氧-缺氧-好氧(A—A—O)”法.此外,“缺氧-好氧-好氧(A—O—O)”法也是“A-O”工艺的延伸,同属于以“缺氧-好氧”为基本流程的生物脱氮工艺. 相似文献
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焦化废水脱氮技术有物理化学法、生物化学法等.生物化学法是较为经济、实效、无污染转移、操作简便易掌握的典型工艺技术.生物脱氮是利用微生物的生物化学作用,将废水中的氨氮经硝化和反硝化反应,转变成为无害的氮气而除去.目前,国内焦化废水处理采用的生物化学脱氮工艺的主要流程有“缺氧—好氧(A—O)”法,以及在此工艺基础上开发的“厌氧—缺氧—好氧(A—A—O)”法.此外,“缺氧—好氧—好氧(A—O—O)”法也是“A—O”工艺的延伸,同属于以“缺氧-好氧”为基本流程的生物脱氮工艺. 相似文献
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不同肥料处理下茶园土壤细菌和古菌群落的时间变化研究 总被引：3，自引：0，他引：3
Hua WANG ;Shao-hui YANG ;Jing-ping YANG ;Ya-min LV ;Xing ZHAO ;Ji-liang PANG 《Journal of Zhejiang University. Science. B》2014,15(11):953-965
研究目的：研究化学肥料和有机肥处理条件下,茶园酸性土壤细菌和古菌群落结构,以及氮素转化相关功能酶基因丰度的时间变化规律。
创新要点：研究肥料、土壤温度及土壤含水量对茶园酸性土壤细菌和古菌群落结构,以及氮素转化相关功能酶基因丰度的影响。
研究方法：应用末端限制性片段长度多态性（T-RFLP）技术分析茶园酸性土壤中细菌和古菌群落结构随时间的变化规律,应用荧光定量聚合酶链式反应（PCR）技术,研究茶园酸性土壤细菌、古菌、硝化作用功能酶基因（细菌和古菌amod基因）和细菌反硝化作用功能酶基因（narG、nirK、nirS和nosZ基因）丰度的时间变化规律。
重要结论：茶园土壤细菌和古菌群落结构受到肥料的影响,并随着取样时间有显著的变化。细菌、古菌和古菌的amoA基因的丰度在7月份最小,而细菌的amoA基因和反硝化作用功能酶基因（除nirK基因）的丰度在9月份最小。有机肥处理增加了细菌、古菌和氮素转化相关功能酶基因的丰度,但化学肥料的施用对菌群及功能酶基因丰度的影响较小。土壤温度显著影响了土壤细菌和古菌的群落结构。土壤含水量与细菌反硝化作用功能酶基因有显著的相关性。土壤有机碳含量与细菌、古菌及功能酶基因丰度之间有显著的相关性。 相似文献
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利用TiAlN涂层刀具对718模具钢进行高速铣削试验研究,获得铣削速度v、背吃刀量αp、进给速度vf和径向铣削深度αe对铣削力的影响规律,为合理选择铣削参数提供可靠的依据。同时,在正交试验结果的基础上, 应用多元线性回归分析方法,建立铣削力的回归数学模型,并用R检验和F检验法验证模型的显著性。 相似文献
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氨氮废水处理过程中的好氧反硝化研究 总被引：7，自引：0，他引：7
采用序批式反应器处理氨氮废水，试验结果验证了好氧反硝化的存在，好氧反硝化脱氮能力随混合液溶解氧浓度的提高而降低，当溶解氧浓度为0．5mg/L时，总氮去除率可达到66．0％。并结合理论分析，对好氧反硝化的机理进行了探讨。 相似文献
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亚硝化-反硝化固定化细胞捷径生物脱氮的研究 总被引：1，自引：0，他引：1
选用聚乙烯醇(PVA)和海藻酸钠(CA)作为载体,添加适量SiO2粉末,将筛选出来的高效亚硝化细菌和反硝化细菌分别制成固定化细胞,联合进行脱氮实验.结果表明:按1:1的比例,亚硝化细菌和反硝化细菌固定化细胞接种量为15%(W/V),在温度为30℃,摇床转数为110rpm的条件下处理合成废水(NH4+-N=150mg/L,碱度(NaHCO3=1700mg/L,pH=8.0),27h,脱氮率为97.53%;处理富营养化水体(NH4+-N=34.26mg/L,pH=6.7),20h,脱氮率达到79.51%. 相似文献
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《Journal of Adventure Education & Outdoor Learning》2007,7(2):113-130
This research highlights the learning of female offenders on a 20-day tailor-made experiential adventure education course (Women in Action) delivered by Outward Bound New Zealand. The aims of the course were to increase self-awareness, to develop an understanding of the concept of choice and self responsibility, to improve communication skills and to effectively influence others. Twenty-seven women were interviewed immediately after the course and 14 of these, three months post-course. Most women indicated that their self-confidence had increased and they had become more self-aware. Key factors in facilitating learning opportunities for the women were the instructors and the course environment both physical and social. The holistic course approach provided physical, creative, emotional and reflective opportunities, enabling all the women to develop personally. The challenge of applying their learning on return to prison was highlighted by some participants.
相似文献
Never did I think that
My life could be changed
In so many ways.
But the challenges I've faced
From being here Lord I Know
That I can make it.
Cos I gotta keep on
Moving on in life
Won't let my spirit fall
Walk on walk on.
Some people tell me
I'd never change.
But now I've seen the light
More clear in every kind of way
I'm alive today
No more worries on my shoulders
I'm gonna make it
Oh yes I am.
Cos I gotta keep on
Moving on in life
Won't let my spirit fall
Walk on walk on.
(Poem by T - Women in Action participant)
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James C. Kaufman Joohyun Lee John Baer Soonmook Lee 《Thinking Skills and Creativity》2007,2(2):96-106
The consensual assessment technique (CAT) is a measurement tool for creativity research in which appropriate experts evaluate creative products [Amabile, T. M. (1996). Creativity in context: Update to the social psychology of creativity. Boulder, CO: Westview]. However, the CAT is hampered by the time-consuming nature of the products (asking participants to write stories or draw pictures) and the ratings (getting appropriate experts). This study examined the reliability of ratings of sentence captions. Specifically, four raters evaluated 12 captions written by 81 undergraduates. The purpose of the study was to see whether the CAT could provide reliable ratings of captions across raters and across multiple captions and, if so, how many such captions would be required to generate reliable scores, and how many judges would be needed? Using generalizability theory, we found that captions appear to be a useful way of measuring creativity with a reasonable level of reliability in the frame of CAT. 相似文献
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微粒群算法(PSO)提出后,由于其优越的性能和易用性而得到了广泛的应用。传统PSO在算法参数设置上主要凭研究者经验进行选择,难免存在主观随意性偏差。采用正交试验设计的方法对PSO算法的w、c_1、c_2参数设置进行试验分析,从而提出较好的参数设置。通过对4个标准测试函数的实验分析,结果显示当w=1、c_1=c_2=3时算法有较好的性能。 相似文献
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Julie C. Dunsmore Ryoichi J. P. Noguchi Pamela W. Garner Elizabeth C. Casey Naureen Bhullar 《Early education and development》2008,19(2):211-237
Research Findings: We examined whether affective social competence, or the ability to effectively send and receive emotional signals and to manage one's own emotional experience, contributes to preschool children's peer relations. Forty-two previously unacquainted preschoolers were observed while participating in a week-long playschool. Greater nonstereotypical emotion knowledge was related to girls' popularity and boys' likelihood of having a reciprocal friendship. Girls with greater skill at sending emotional communications and managing emotions were more likely to have a reciprocal friendship. Boys who were better at managing emotions compared to others in their group were less popular. The role of social context in the influence of affective social competence on children's peer relations is discussed. Practice or Policy: Results have implications for early childhood educators' promotion of children's socioemotional skills. 相似文献
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Do modes of thinking predict career interest types among Chinese university students? 总被引：2，自引：0，他引：2
This study had two objectives. The preliminary objective was to further test the psychometric properties of the short-version self-directed search that was intended to be a brief research tool for measuring Holland [Holland, J. L. (1973). Making vocational choices: A theory of careers. Englewood Cliffs, NJ: Prentice-Hall; Holland, J. L. (1994). Self-directed search. Odessa, FL: Psychological Assessment Resources] six career interest types. The primary objective, though, was to examine the predictive power of modes of thinking for career interest types. Modes of thinking were grounded in Torrance's [Torrance, E. P. (1981). Implications of whole-brained theories of learning and thinking for computer-based instruction. Journal of Computer-Based Instruction, 7(4), 99–105] notion of brain dominance.
Two hundred and seventy-two university students from Shanghai, People's Republic of China, responded to the style of learning and thinking and the short-version self-directed search. Results showed that after gender effect was taken into account, the holistic mode of thinking (characterized by its creativity-generating tendency) significantly predicted five of the six career interest types (realistic, investigative, artistic, social, and enterprising) defined by Holland. The analytic mode of thinking (characterized by its tendency for norm-conformity) contributed to Holland's conventional career interest type. We discuss implications of these findings for university educational and career counselors and for faculty members. 相似文献