锡林浩特褐煤提质同步热分析动力学分析

为研究褐煤提质过程中的现象和规律，本文测定了流动气氛中，锡林浩特褐煤提质过程的非等温热重分析-差示扫描量热法（TG-DSC）同步热分析数据。将无模型法（Friedman法）与多重扫描速率法（升温速率分别为5、10、15、20、25和30K/min）结合，得出不同粒径（74~104μm、104~124μm和124~178μm）下测试样品提质过程的质量动力学模型与热动力学模型。综合两种模型可以发现，粒径越小，质量行为与热行为越一致，并且机理函数模型E1:α、B1:α(1-α)和D1:1/2α适合描述锡林浩特褐煤的提质过程。     

Review： Deregulation of microRNA expression in thyroid tumors

MicroRNAs （miRNAs or miRs） are endogenous non-coding RNAs that negatively regulate gene expres- sion by binding to the 3＇ non-coding regions of target mRNAs, resulting in their cleavage or blocking their translation. miRNAs may have an impact on cell differentiation, proliferation, and survival, and their deregulation can be inclined to diseases and cancers, including thyroid tumors. The purpose of this review is to summarize the existing findings of deregulated miRNAs in different types of thyroid tumors and to exhibit their potential target genes, especially to demonstrate those involved in tumor invasion and metastasis. In addition, new findings of circulating miRNA expres- sion profiles, single nucleotide polymorphism （SNP） in thyroid tumors, and the correlation of somatic mutations with deregulated miRNA expression in thyroid tumors were all included in this review.     

钻探技术如何适应深部找矿的要求

分析了安徽勘探单位从事深部找矿钻探技术、设备、专业技术人员现状及深部找矿对钻探技术等的需求。文章结合现实提出钻探技术应如何适应深部找矿的要求，对解决现实找矿中遇到的技术难点有一定的参考意义。     

我国企业安全生产风险抵押金制度的完善

指出企业安全生产风险抵押金制度具有适用主体特定、存储目的特定、存储金额特定、使用方式特定等特点。认为实施该制度很好地保障了五类企业劳动者的生命财产安全,对企业负责人加强安全生产也有很大的敦促作用,但是该制度也存在一些问题。提出了扩大存储的有效范围、拓宽抵押金的使用范围、加强监管等具体改进措施。     

混凝土结构课程实验教学的探索

提出混凝土结构课程实验环节的改革措施。该措施主要注重学生自主设计实验、操作实验、分析实验结果并得出实验结论,通过综合性实验加深理解所学的理论知识,培养学生严谨缜密的工作作风以及对所学知识综合应用的能力。     

ε-Zn(OH)2晶体的制备与性质研究

在高浓度的氢氧化钠水溶液中从Zn(Ac)     

AA/AMPS接枝环氧树脂E-44的水性化改性研究

为改善环氧树脂E-44的水溶性,以丙烯酸(AA)和2-甲基-2-丙烯酰胺基-丙磺酸(AMPS)为接枝共聚的单体对环氧树脂进行水性化改性.研究了引发剂、不同单体及比例和反应条件对接枝共聚物水分散稳定性的影响并通过红外光谱对产物进行了表征.结果表明,以2.71wt%的BPO为引发剂、以体积比1∶1的无水乙醇-乙二醇单甲醚为混合溶剂,在接枝共聚反应温度110℃,下用质量比为1∶1的AA/AMPS对等质量的环氧树脂E-44进行改性,得到的改性环氧树脂水性化改性效果最好,乳液离心稳定性和贮存稳定性最高.     

Calculation of angular glint in near field utilizing graphical electromagnetic computing

The angular glint in the near field plays an important role on radar tracking errors. To predict it more efficiently for electrically large targets, a new method based on graphical electromagnetic computing （GRECO） is proposed. With the benefit of the graphic card, the GRECO prediction method is faster and more accurate than other methods. The proposed method at the first time considers the special case that the targets cannot be completely covered by radar beams, which makes the prediction of radar tracking errors more self-contained in practical circumstances. On the other hand, the process of the scattering center extraction is omitted, resulting in possible angular glint prediction in real time. Comparisons between the simulation results and the theoretical ones validate its correctness and value to academic research and engineering applications.     

Irrigation-induced pollution of organochlorine pesticides and polychlorinated biphenyls in paddy field ecosystem of Liaohe River Plain, China

In order to assess the influence of long-term irrigation of polluted river water on the ecological health of the rice fields in the low reach of Liaohe River Plain,a series of environmental samples and biological samples in rice fields,including sediments,paddy soils,mitten-handed crabs(Eriocheir sinensis),loaches(Misgurnus anguillicaudatu) and frog(Hoplobatrachus tigerinus),were collected from the area far away from industrial zones,and polychlorinated biphenyls(PCBs) and organochlorine pesticides(HCH,DDT,HCB and Mirex) were analyzed by high resolution gas chromatography coupled with high resolution mass spectrometry(HRGC/HRMS).The comparison of pollutant concentrations and profiles verified that the significant contribution of river water irrigation to PCBs contaminations in paddy soils and the mutual influence of organochlorine pesticide contamination between river sediments and paddy soils.Bioaccumulations of PCBs and organochlorine pesticides in mitten-handed crabs and loaches were site-specific,suggested that they were both the good indicators of ecosystem health.Mitten-handed crabs had the highest capacity to accumulate PCBs and organochlorine pesticides,and also they had the strong ability to degrade these pollutants in their bodies,especially for DDT and HCH.The biota-soil accumulation factors(BSAF) of ΣH CH,ΣDDT,Mirex,HCB and ΣP CBs in mitten-handed crab were calculated to be 24.5,15.3,122.2,28.1 and 54.6,respectively.In view of the strong bioaccumulation ability,the health risk should be concerned for the cultivation of mitten-handed crabs in paddy fields in the low reach of Liaohe River Plain.     

海带对罗源湾养殖区海水的生物修复研究

研究了罗源湾海带栽培期间3-5月的水质状况,以及室内海带个体对养殖废水的净化作用.结果表明:大面积海带栽培可改善罗源湾的水质状况,降低无机氮磷含量.3-5月海带栽培区的总无机氮(DIN)的降低率分别达到25.48％、19.62％、44.65％,总无机磷(DIP)的降低率分别为20.17％、32.00％、38.72％.在7d实验期间,海带个体对养殖废水的净化效果明显,DIN的去除率可达98％以上.海带在养殖废水中能正常生长,保持一定的日增长率,鲜质量及叶片长有所增加.