复合微生物菌剂在海水养殖废水中的修复作用

采用直接投加复合微生物菌剂原位修复实际养殖废水,去除水体中的有机物、氮和磷等污染物,分析微生物处理对水体CODCr、BOD5、溶解氧含量、透明度变化的影响.结果表明:采用微生物技术修复养殖系统水环境具有显著效果,试验期间透明度范围适宜水产养殖,水体中CODCr降低了61.2%,BOD5降低了53.3%,而溶解氧有所上升,总氮降低38.1%,总磷降低27.4%,底泥中的总氮和总磷变化不大.     

黄壁庄水库总氮、总磷含量与反射光谱特征的关系

水质定量遥感是目前一个研究热点,笔者研究水体反射光谱特征与总氮（TN）、总磷（1P）之间的关系,为今后利用星栽高光谱传感器对黄壁庄水库乃至中国北方内陆水体水质参数进行大面积反演提供理论基础．利用高光谱地物光谱仪在黄壁庄水库进行了反射光谱测量和同步水质采样分析,在分析黄壁庄水库水体反射光谱特征的基础上,通过计算单波段和一阶微分水体光谱反射率与总氮、总磷之间的相关系数,确定总氮、总磷的敏感波段,分别建立了总氮、总磷的遥感定量模型．结果表明在595nm和873nm波段反射率的一阶微分均与总氮、总磷浓度有较好的相关性．     

汤河水体污染特征及分析

为了解汤河水体中污染物的变化特征,选取7个代表性取样点分季节进行2次水体采样,测定pH、氨氮、总氮、总磷及COD,并分析其成因.研究结果表明汤河水体pH整体上2月份较7月份略高,除取样点1、2外,其他各点2月份氨氮、总氮、总磷和COD都较7月份高. 可见,7月份汤河水质明显优于2月份,其原因可能与7月份水生植物生长旺盛,植物吸收了水体中的氮、磷等污染物,以及2月份水中植被死亡有机物的释放有关.此外,从汤河上游到下游水体污染物浓度呈现出明显上升的趋势,但不同取样点水体污染物浓度变化较大,氨氮、 总氮、 总磷及COD浓度变化幅度依次为0.052-0.32 mg/L 、0.075-0.41 mg/L、0.014-0.419 mg/L和11-31.7 mg/L,导致这种现象的原因可能与取样点周边城镇、农村生活污水、农业和工业废水的无序排放有关.     

洞庭湖水质变化趋势的研究

以洞庭湖1992-2010年系列监测资料为依据,对洞庭湖19年的整体水质情况、富营养化状况以及主要污染指标进行了评价分析。结果表明:洞庭湖水质污染以氮磷污染为主,水体状况呈逐渐恶化的趋势,富营养化程度逐年加剧。2007年对洞庭湖流域进行整治后,水体中化学需氧量降低,但水体总氮和总磷浓度仍呈上升趋势,致使洞庭湖水体中叶绿素a含量和浮游植物数量显著增加。     

陕西洽川湿地水质模糊综合评价

应用模糊综合评价法对陕西洽川湿地2012年夏季水质监测数据进行综合评价.通过对各监测点5个主要影响因子的权重和隶属度综合分析得出:2个监测点水质达到Ⅲ类标准,3个监测点水质接近V类标准,主要污染物为总磷、总氮和高锰酸盐指数,洽川湿地水体富营养化严重.     

梅州市文化公园人工湖富营养化分析

通过对梅州市文化公园人工湖水体中总磷（TP）、总氮（TN）、叶绿素（Chla）、化学需氧量（CODMn）、透明度（SD）等水质参数实际监测的统计计算,采用综合营养状态指数法对文化公园水质的营养状况进行了分析和综合评价,计算统计结果表明,文化公园人工湖水体处于重度富营养化状态并趋向稳定,并就文化公园人工湖的具体情况及其现状提出防治建议。     

水葫芦对宁德市东湖塘水中氮磷的清除作用

测定水葫芦对宁德市东湖塘水体中总氮（TN）、总磷（11P）的清除作用;结果表明：经过25d的净化,水体中总氮的含量由3．45mg,L降至0．64mg／L,总去除率达80．2％;而总磷的浓度由原来的1．12mg／L降为0．26mg／L,总去除率为76．8％,这说明水葫芦对污水具有较强的净化能力．     

普者黑旅游活动对水体质量的影响研究

良好的水体环境是普者黑旅游业的生命线,为了使该区域旅游业能够持续发展而不破坏水体环境,选取1 997、2003、2004、2006、2008五个年份的高锰酸盐指数、总磷、总氮、氨氮、B0D5五项因子作为普者黑景区水体变化指标,先对单个因子进行分析,然后将五项因子分别和游客接待量变化关系做统筹分析,提出控制普者黑水体污染...     

邛海入湖污染源控制方法与效果分析——以生活污染源为例

本文通过对邛海泸山风景区周围生活废水处理前后相关指标进行监测、分析,评估其处理效益以及对保护当地生态环境所做出的贡献.结果表明:生活污染源是邛湖水生环境控制的重点.生活废水处理后各项指标都大幅度下降,达到《城镇污水处理厂污染物排放标准》(GB 18918-2002)一级(A)标准限值,其中化学需氧量(COD)、总氮(TN)、动植物油、阴离子洗涤剂(LAS)分别减小7.3、6.3、44.4、32.9倍,但总氮(TN)、总磷(TP)有超标风险,水体总体呈富营养化趋势,需要密切关注.     

洱海及上游主要湖泊底泥营养盐的研究

以洱海全湖范围内的7条采样样线及上游3个主要湖泊的底泥为研究对象,测定了总氮、总磷2个参数,分析洱海沉积物的氮磷含量及其分布特性和影响因素。实验结果表明：洱海7条样线底泥中总磷的平均值达到266.80 mg/kg,极大值为818.20 mg/kg;总氮含量的平均值达到513.60 mg/kg,极大值为1 975.40 mg/kg。洱海上游3个主要湖泊底泥总氮、总磷含量实验测定结果为总氮的平均值为370.00 mg/kg,极大值为1 397.20 mg/kg;总磷的平均值为52.43 mg/kg,极大值为140.20 mg/kg。总氮、总磷含量与辐射乡镇的人口数量及耕地面积呈正相关,总氮含量还与年人均收入呈正相关。     

Multicultural leadership, sustainable total school environment

Banks (2002) stated that to implement multicultural education successfully, we must think of the school as a social system. Therefore, if educational equity and excellence are to be provided to all students, a systemic Total School Environment [Banks (2001) Cultural diversity and education: Foundations curriculum and teaching, 4th ed. Allyn and Boston p.51] has to be structured and permeate every aspect of the schooling enterprise, i.e. (1) content integration, (2) the knowledge construction process, (3) prejudice reduction, (4) equity pedagogy, and (5) an empowering school culture and social structure. The Total School Environment is consistent with the educational change literatures discussed by Senge [(1990) The fifth discipline. Currency doubleday, NY]. This article is framed conceptually on a review of literature and the discussion is drawn from the case studies of innovative pedagogical practices using technology collected in the two research projects of the Center for Information Technology in Education (CITE), The University of Hong Kong during 2004–2006. With referencing to multiple school leadership literature and practices, the readers have an opportunity to explore the possible formation of the “total school environment” from one of the cases, but why not in another school? At the end of this article, it is concluded that school innovation requires a moral, systemic, integrative and emergent distributed leadership to build a scalable, sustainable learning community in a multicultural school environment.     

Fruit quality, anthocyanin and total phenolic contents, and antioxidant activities of 45 blueberry cultivars grown in Suwon, Korea

Blueberry fruits from 45 commercial cultivars (39 northern highbush and 6 half highbush blueberry) grown in Suwon, Korea were analyzed for fruit size, soluble solids content, titratable acidity, total anthocyanin content, total phenolic content, and antioxidant activity. Fruit characteristics varied widely among the 45 blueberry cultivars. Fruit weight ranged from 0.9 to 3.6 g, soluble solids content from 8.3 to 14.3 °Brix, and titratable acidity from 0.8% to 3.6%. Antioxidant activity ranged from 0.7 to 2.1 mg of quercetin equivalents per gram of fresh berries in different blueberry cultivars. Among the 45 blueberry cultivars, high amounts of anthocyanins and polyphenols, and high antioxidant activity were observed in ‘Elliott’, ‘Rubel’, ‘Rancocas’, and ‘Friendship’.     

Chern and total curvature

Shiing-Shen Chern was one of the great mathematicians of the twentieth century, and a towering figure in the field of differential geometry, where one studiescurvatures of spaces. In this article we give the reader a glimpse into differential geometry and the work of Chern.     

Minus total κ-subdomination in graphs

Let G=(V, E)be a simple graph without isolated vertices. For positive integer κ, a 3-valued function f:V → {-1, 0, 1} is said to be a minus total k-subdominating function(MTκSF)if ∑u∈N(u)f(u)≥ 1 for at least κ vertices v in G, where N(v)is the open neighborhood of v. The minus total κ-subdomination number γ-κt(G)equals the minimum weight of an MTkSF on G. In this paper, the values on the minus total κ-subdomination number of some special graphs are investigated. Several lower bounds on γ-κt of general graphs and trees are obtained.     

黄豆、黑豆、黄豆芽总黄酮含量及抗氧化活性

以蒸馏水、70%甲醇、70%乙醇、70%丙酮作为提取剂,用分光光度法测定黄豆、黑豆、黄豆芽中总黄酮的含量.并通过测定各样品提取液对超氧阴离子自由基(O2-·)、羟基自由基(·OH)的清除率,比较不同提取物的抗氧化活性.结果表明:甲醇对总黄酮提取率较高,其中黄豆的甲醇提取液中总黄酮含量最高为1.392mg/g.同时表明,黄豆的甲醇提取液具有较高抗氧化活性,对O2·-,·OH清除率分别为54.50%,61.00%.     

图的符号全划分数

Let G = （V, E） be a graph, and let f ： V →{-1, 1} be a two-valued function. If ∑x∈N（v） f（x） ≥ 1 for each v ∈ V, where N（v） is the open neighborhood of v, then f is a signed total dominating function on G. A set {fl, f2,… fd} of signed d total dominating functions on G with the property that ∑i=1^d fi（x） ≤ 1 for each x ∈ V, is called a signed total dominating family （of functions） on G. The maximum number of functions in a signed total dominating family on G is the signed total domatic number on G, denoted by dt^s（G）. The properties of the signed total domatic number dt^s（G） are studied in this paper. In particular, we give the sharp bounds of the signed total domatic number of regular graphs, complete bipartite graphs and complete graphs.