用离散速度方法计算浅水长波方程

国家自然科学基金资助项目 (1970 2 0 0 5 )用离散速度法计算浅水波方程 ,将空气动力学方程和浅水波方程作了比较 ,用 Nadiga提出的近平衡流动方法模拟浅水波方程的连续和间断解。计算了一维的溃坝波问题和 Thacker提出的连续解问题 ,结果与精确解作了比较 ,并且计算了水流跃过障碍物的问

Study on quality standard of Minghuanggao gel

目的:研究明黄膏质量标准。方法:采用薄层色谱(TLC)法对明黄膏中的主要成分大黄、黄连、苦参进行定性鉴别;高效液相色谱(HPLC)法测定明黄膏中大黄酚的含量。结果:TLC色谱中均能明显地检出大黄、黄连、苦参;HPLC法测得本品中大黄酚的含量为0.267~0.308 mg·g-1;在10.02~100.16 mg·L-1的范围内,溶液的浓度与峰面积呈良好线性关系,r=0.999 9;加样平均回收率为98.48% (n=6),RSD为1.20%。结论:本品定性、定量方法简便、准确,专属性强,质量标准能够控制该制剂的内在质量。OBJECTIVE To study the quality standard of Minghuanggao gel. METHODS Radix et Rhizoma Rhei, Rhizoma Coptidis and Radix Sophorae Flavescentis in Minghuanggao gel were identified by TLC. The content of chrysophanol in this preparation was determined by HPLC. RESULTS Radix and Rhizoma Rhei, Rhizoma Coptidis and Radix Sophorae Flavescentis in Minghuang-gao gel could be detected obviously by TLC. The content of chrysophanol in this gel was 0.267 - 0.308 mg·g -1 . The linear ranges were 10.02 - 100.16 mg·L -1 with good positive correlation. The average recovery of chrysophanol was 98.48% ( n =6),RSD= 1.20% . CONCLUSION TLC is a simple, method HPLC is accurate and reliable method. The quality standard can be used for quality control of this product.甘肃省科技厅中青年科技基金资助项目(编号:YS 011 A23 015

Synthesis of Ruthena-polycyclic Complexes by Ruthenium-Vinylcarbene Complex

研究了配位不饱和的钌杂S-顺丁二烯化合物[ru(CHC(PPH3)CH(2-Py))Cl2PPH3]bf4(1)与水、甲醇、苯胺和2-巯基吡啶等亲核试剂的[4+1]关环反应,合成了一系列有趣的钌杂多环化合物[ru(CHC(PPH3)CHr(2-Py))Cl(PPH3)2]bf4[r=OH(2),OME(3),和nHPH(4)]与[ru(CHC(PPH3)CH(S(2-Py))(2-Py))PPH3(S(2-Py)]bf4(5).此外,将配位不饱和的钌配合物1与三苯基膦配体反应,制备了类似于氮杂金属萘的配位饱和化合物[ru(CHC(PPH3)CH(2-Py))Cl2(PPH3)2]bf4(6).6与Hbf4反应可生成金属杂环结构类似的分子内含三氯桥的双钌核配合物[{ru(CHC(PPH3)CH(2-Py))PPH3}2(μ-Cl)3](bf4)3(7).以上产物均通过核磁(nMr)与元素分析进行了表征,并解析了部分产物的X射线单晶结构.Treatment of ruthenium-vinylcarbene complex [Ru(CHC(PPh3)CH(2-Py))Cl2 PPh3 ]BF4(1) and PPh3 with nucleophilic reagents H2 O,CH3 OH,NH2 Ph,or 2-mercaptopyridine led to the ruthena-polycyclic complexes [Ru(CHC(PPh3)CHR(2-Py))Cl(PPh3)2 ]BF4 [R = OH(2),R = OCH3(3),R = NHPh(4)] or [Ru(CHC(PPh3)CH(S(2-Py))(2-Py))PPh3(S(2-Py)]BF4(5).They are stable under air at solid state.CH3 OH in the reaction is not only the reagent but also the solvent and the reaction must be heated at 60 ℃ for 6 h.All the other reactions were carried out at room temperature in CH2Cl2.The crystals of 4 and 5 were grown from CH2 Cl2 and CHCl3 solutions layered with diethyl ether,respectively.The structures 4 and 5 were determined by X-ray crystallography.The crystal size of 4 is a=1.29145(3) nm,b=1.37687(5) nm,c= 1.86914(4) nm,α=92.114(2)°,β=106.271(2)°,γ=96.333(3)° and the size of 5 is a=1.15333(18) nm,b=1.20072(19) nm,c=1.9081(3) nm,α=88.466(3)°,β=87.918(3)°,γ=79.521(3)°.In addition,refluxing 1 with PPh3 in CHCl3 for 6 h to produce red solid [Ru(CHC(PPh3)CH(2-Py))Cl2(PPh3)2 ]BF4(6).The reaction of complex 6 with HBF4 at room temperature for 3 h afforded the(μ-Cl)3-bridged bisruthenium-vinylcarbene complex [{Ru(CHC(PPh3)CH(2-Py))PPh3 }2(μ-Cl)3 ](BF4)3(7) in 87% yield.The crystal of 6 was grown from CH3 COCH3 solution layered with diethyl ether,and the crystal of 7 was grown from CHCl3 solution layered with diethyl ether.The structures of 6 and 7 were also determined by X-ray crystallography.The crystal size of 6 and 7 are a=1.13777(3) nm,b=1.56466(7) nm,c=1.79541(7) nm,α=75.822(3)°,β=79.502(2)°,γ= 79.259(3)°,a=1.68830(3) nm,b=2.33421(4) nm,c=2.48603(4) nm,α=90°,β=96.5530(10)°,γ=90°,respectively.The CCDC number for 3,5,6,and 7 are 945539(3),945538(5),945541(6),and 945542(7).All these complexes were fully characterized by elemental analysis and NMR spectroscopy.国家重点基础研究发展计划(No.2012CB821600); 国家自然科学基金(Nos.20925208;21174115;21272193); 长江学者和创新团队发展计划资助~

Water quality assessment on Tongan Bay, Xiamen

根据 1 995～ 1 999年同安湾海域的水质监测资料 ,对海域的水质状况进行了评价和营养分级。结果表明 ,海域水质处于高N低P状态。pH、DO、CODMn、和BOD5 符合GB 30 97 1 997第二类海水水质标准 ,但DIN、石油类和DRP超第二类海水水质标准。DIN和石油类的超标率和超标倍数有逐年增强之势。该海域目前处于P中等限制潜在性富营养水平阶段。Based on the survey data in Tongan Bay of Xiamen from 1995 to 1999, the assessments and classification for water quality and the nutrient levels were respectively done. The results shown: (1) The survey area has the typical characteristics of rich nitrogen and low phosphorus. (2) The contents of pH, DO, COD Mn and BOD 5 are coincide with the sea water quality standard of GB 3097 1997, and the contents of DIN, DRP and Oil are beyond the standard. (3) Tongan Bay was at the stage of middle phosphorus limited potential eutrophication

中国南方地区罗非鱼无乳链球菌的分子流行病学研究

从广东省以及海南省等地区养殖的患病罗非鱼体内分离、收集到多株致病菌,经生化分析和分子生物学鉴定,均为无乳链球菌。对这些菌株分别进行了耐药谱测定、分子分型试验以及分子血清型分析。药敏试验结果表明,2007—2010年分离到的无乳链球菌耐药谱基本相似;多位点可变数目串联重复序列分析(MLVA)试验中,选择5个高变异指数的可变数目重复位点(VNTR)进行分子分型,结果表明,所有鱼源无乳链球菌菌株为同一MLVA型,而作为对照的牛源无乳链球菌则明显不同;为了对这些菌株进一步分型,分别进行了分子血清型和表面蛋白抗原基因的检测,结果表明,鱼源无乳链球菌的分子血清型均为Ⅰa型,表面蛋白抗原均为alpha-C蛋白。这进一步说明了不同年份和不同地区的鱼源无乳链球菌在基因水平上为同一分子类型,具有相同的起源或传染源。同时也说明,我国南方地区罗非鱼无乳链球菌在这几年中未发生明显的遗传变异。这些结果为罗非鱼无乳链球菌病疫苗研制,疫病监测及药物防治的研究提供理论依据

A case study of cumulative effects assessment for harbor planning in China

累积影响评价是战略环境评价的主要方法和重要内容之一,但目前还缺乏通用的评价程序和方法。通过识别港口规划的累积影响源和途径,建立了基于水动力数值模型的累积影响评价的量化评估和分析框架。以厦门港嵩屿港区规划为例,通过对海湾纳潮量及各敏感点流速的模拟,计算淤积量及其分布变化,进而推测海域水质和底质变化,并分析了由此引起的海洋生物群落的变化趋势。通过比较不同岸线方案的累积影响,为港区岸线优选提供了科学判据。实践表明,该方法框架综合运用定量预测和定性分析手段,其结果能为港口规划的战略环境评价提供科学依据。 【英文摘要】 Cumulative effects assessment (CES) has become an important approach and also a key component of the strategic environmental assessment due to the increased recognition that most significant environmental changes are results of combined effects of many individual impact factors. Analyzing combined environmental effects is simple in principle but difficult in practice due to a lack of simple and effective CES methods and procedures. The paper presents a case of CIE for the harbor planning project for Songyu ..

高硫化氢合成气制甲硫醇新型钼基催化剂研究

研究了一系列负载型钼基催化剂催化含高硫化氢合成气制甲硫醇的性能 ,用XPS和ESR对其进行表征 .活性测试显示 ,钾促进的钼基催化剂催化的反应产物中甲硫醇成为主导产物 .几种钼基催化剂合成甲硫醇的活性大小顺序 :K2 MoO4/CoO/SiO2 >K2 MoO4/SiO2 >MoO3 /K2 CO3 /SiO2 >K2 MoS4/SiO2 >MoS2 /K2 CO3 /SiO2 .ESR表征显示 ,反应后的催化剂可以检测到“oxo Mo(V)”和“thio Mo(V)”物种 .XPS表征显示反应后催化剂中的Mo包含着Mo4+ ,Mo5+ 和Mo6+ ,S包含着S2 -,(S—S) 2 -和S6+ 三种价态 .添加CoO后 ,“oxo Mo(V)”含量减少 ,而“thio Mo(V)”含量增加 ,(S—S) 2 -物种的生成得到抑制 ,S2 -物种的量增多 .(Mo4+ +Mo5+ ) /Mo6+ 峰强度比为 0 75以及S2 -/(S—S) 2 -接近 1有利于甲硫醇的生成 .本文提出甲硫醇的合成与“Mo S K”相关联的反应机

软颗粒饲料对“红膏蟹”培育生长、存活和营养成分的影响

将平均体质量(453.6±46.91)g、已交配的健康锯缘青蟹饲养在36cm×26cm×27cm塑料箱中,投喂由鲜杂鱼糜加淀粉、电解多维粉末和卡拉胶制得的软颗粒饲料,培育锯缘青蟹\"红膏蟹\"。试验结果表明,29~31d育成\"红膏蟹\";投喂软颗粒饲料的青蟹肌肉占比(59.89%~60.84%)显著低于投喂冰鲜杂鱼和贝类的青蟹(P<0.05),但培育成活率(96.9%~97.1%)、质量增加率(67.26%~69.47%)、特定增长率(1.39%/d~1.53%/d)、可食部分(65.67%~66.32%)和红膏占比(17.36%~17.68%)均显著高于投喂冰鲜杂鱼和贝类的青蟹(P<0.05);软颗粒饲料组\"红膏蟹\"肌肉中粗蛋白、脂肪和水分的含量分别为19.9%、0.8%和75.1%,生殖腺中粗蛋白、脂肪和水分含量分别为30.59%、14.50%和54.69%,肌肉和生殖腺中必需氨基酸的含量分别为5.59%和8.14%,呈味氨基酸的含量分别为6.50%和9.90%,氨基酸评分分别为71.7和100,肌肉和生殖腺中饱和脂肪酸总量分别为44.0%和49.2%,单不饱和脂肪酸总量分别为24.6%和29.2%,多不饱和脂肪酸总量分别为27.9%和15.7%;投喂软颗粒饲料提高了青蟹肌肉中粗蛋白的含量和青蟹的营养价值。福建省星火项目(2016S0055);;福建省公益性项目(2018R1037-1);;2017年宁德市现代渔业结构调整资金资助项目(宁财农指[017]65号);;宁德师范学院科研发展资金资助项目(2016FZ24

Novel Mo-based catalysts for methanethiol synthesis from high H2S-containing syngas

A series of supported Mo-based catalysts for methanethiol synthesis from high H2S-containing syngas were investigated by kinetics and XPS, ESR characterization. The activity evaluating results show that upon the potassium-promoted Mo-based catalysts, the methanethiol will become dominant product of the reaction, and the activity sequence of several Mo-based catalysts for the reaction is as follows: K2MoO4/CoO/SiO2 > K2MoO4/SiO2 > MoO3/K2CO3/SiO2 > K2MoS4/SiO2 > MoS2/K2CO3/SiO2. In the ESR characterization of the catalysts used the resonant signals of "oxo-Mo(V)" and "thio-Mo(V)" can be detected. The XPS characterization indicates that mixed valence Mo species Mo4+, Mo5+ and Mo6+ and three kinds of S species S2-, (S-S)(2-) and S6+ exist in the catalysts. As a promoter CoO was introduced into Mo-based catalysts. It was observed that the addition of CoO leads to decrease of the amount of "oxo-Mo(V) " in the catalysts, but increase of the amount of "thio-Mo(V)", which may be connected with "Mo-S-K" phase or "Co-Mo-S-K" phase, meanwhile CoO in die catalyst was found to enhance the formation of S2-, but inhibit the formation of (S-S)(2-). It was found also that the methanethiol synthesis is favored if the peak intensity ratios of (Mo4+ + Mo5+)/Mo6+ and S2-/(S-S)(2-) are kept at about 0.75 and 1 level respectively. A possible mechanism about the relationship of CH3SH formation with "Mo-S-K" phase was proposed

Evaluation for Effect of Building Electroplating Concentrated Control Zone on Marine Environment

以福建晋江西滨电镀集控区建设项目为例 ,分析了该建设项目对海洋环境影响的主要因子 ,并对建设项目对海洋水环境和底质环境的影响进行了预测与评价 ,提出了控制总量和防治措施。The Effect of building electroplating concentrated control zone at Xibin,Jinjiang,Fujian on marine environment is analyzed.The paper also makes a prediction and evaluation on the water and substrate environment.The methods of controlling pollution are suggested