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Search Results: 1 - 10 of 54132 matches for " 侯晨涛 "
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煤矿瓦斯的微生物治理技术

煤田地质与勘探 , 2007,
Abstract: 甲烷氧化菌以甲烷为其唯一碳源和能源,在瓦斯治理方面具有潜在应用价值.介绍了瓦斯微生物治理技术的国内外研究现状、甲烷氧化菌氧化甲烷的机理和影响因素,以及甲烷氧化菌的生态分布.分析了微生物治理技术的可行性,并展望了今后的研究方向.
真菌TrichodermaviridePers.exFr降解三苯废气性能实验
,马广大
环境工程 , 2007, DOI: 10.13205/j.hjgc.200703014
Abstract: 利用固相静态试验考察前期实验驯化出的真菌TrichodermaviridePers.exFr对苯、甲苯、二甲苯的好氧生物降解性能。结果表明,在本研究的气相浓度范围内(苯47.25~1677.47g/m3,甲苯64.70~1258.50g/m3、二甲苯20.59~1707.85g/m3),3种气体的降解速率随其初始浓度的增大而增加,降解规律苯、甲苯符合Monod方程,二甲苯符合一级反应。
TiOF2光催化降解甲基橙的影响因素研究
林萍,,柳文莉
- , 2018, DOI: 10.13543/j.bhxbzr.2018.04.009
Abstract: 通过溶胶-凝胶法制备氟氧钛(TiOF2)花状纳米球,采用X射线粉末衍射仪(XRD)、扫描电子显微镜(SEM)、傅里叶红外光谱分析仪(FT-IR)和固体紫外漫反射仪(UV-Vis DRS)等手段对TiOF2花状纳米球进行表征分析,并通过实验探究了不同条件下TiOF2对甲基橙染料废水的光催化降解性能。在300 W氙灯模拟太阳光照射2.5 h条件下,质量浓度0.5 g/L TiOF2光催化剂对初始质量浓度20 mg/L、pH呈中性、体积为100 mL的甲基橙染料废水在20 ℃反应条件下降解效果最佳,催化降解率可达97.3%。此结果说明所制备的TiOF2光催化剂对甲基橙染料废水具有良好的光催化活性。
Abstract:We have successfully synthesized flower-shaped TiOF2 nanospheres via a sol-gel method. The samples were characterized by XRD, SEM, FT-IR and UV-vis DRS spectroscopy. In addition, the photocatalytic properties of TiOF2 flower-shaped nanospheres were studied using the degradation of methyl orange (MO) under different conditions. The results show that when 0.5 g/L of TiOF2 flower-shaped nanospheres was added to 100 mL of solution with 20 mg/L of neutral MO at room temperature, the degradation ratio reached 97.3% after 2.5 hours when irradiating under a 300 W xenon lamp. The results show that as-prepared TiOF2 flower-shaped nanospheres have outstanding catalytic activity in the photocatalytic degradation of MO dye wastewater under sunlight.
陕北泥炭中重金属元素丰度及其潜在生态危害
,姚改焕,王英,曾社教
煤田地质与勘探 , 2007,
Abstract: 采用原子吸收分光光度计法对陕北榆林地区的盂家湾、河湾、尔林兔3个地区泥炭中的重金属元素进行了分析,并根据Hakamon提出的潜在生态危害指数法对其潜在生态危害性进行了评价。结果表明Cd元素的含量超过土壤背景值,Cu、Pb、Cr、Mn4个元素的含量均低于土壤背景值;重金属元素的生态危害指数除Cd较高,属极高水平外,Cu、Pb、Cr、Mn均较低。这3个地区泥炭中的重金属元素生态危害程度为中等以上,且尔林兔〉河湾〉孟家湾。
煤矸石制作硅肥技术试验研究
王生全,谢宵斐,,聂文杰,张小波
煤田地质与勘探 , 2009,
Abstract: 煤矸石制作硅肥时应先对煤矸石进行活化处理。通过在煤矸石中加入助剂,采取高温煅烧方法,研究出了煤矸石中有效硅活化的最佳助剂比例为煤矸石CaCO3Na2CO3NaOH=10.10.50.05;煤矸石活化的最佳温度为700℃;最佳煅烧时间为2h;最佳粒度为80目。依据煅烧试验结果,提出了煤矸石制作硅肥的工艺技术。经对试验制成的硅肥成分与有害元素测试,符合国家硅肥标准。
基于blt方程的微带线电磁耦合终端响应
彭强,周东方,德亭,,王利萍,
强激光与粒子束 , 2013,
Abstract: ?为定量研究电磁波与微带线的耦合终端响应问题,提出一种基于blt方程的电磁波与微带线耦合分析方法,相比传统方法计算效率高、占用内存少。将pcb板上微带线等效为有耗传输线模型,对辐照平面波进行矢量分析并求解等效激励源,运用blt方程研究不同入射方式、脉冲波形对微带线终端的影响,并对入射波与终端响应进行了时域、频域分析。研究表明:当入射波频率与微带线长度满足一定关系式时对微带线的耦合最强,耦合电压峰值达2.4mv;电场平行微带线入射比垂直pcb入射时的终端电压峰值大一倍;且同幅同脉宽的矩形脉冲较高斯脉冲和三角脉冲对微带线的耦合峰值电压大;不同波形的脉冲通过调节脉宽都可对微带线耦合终端电压达到mv量级。
从自动化到智能化:软件漏洞挖掘技术进展
From automation to intelligence: Survey of research on vulnerability discovery techniques

邹权臣,,吴润浦,马金鑫,李美聪,,长玉
- , 2018, DOI: 10.16511/j.cnki.qhdxxb.2018.21.025
Abstract: 近年来,随着软件规模和复杂度的日益增加,软件漏洞挖掘技术正逐渐向高度自动化和智能化演变,该文从传统漏洞挖掘技术和基于学习的智能化漏洞挖掘技术两方面深入调研和分析了相关的研究进展。首先,从静态和动态挖掘技术2方面详细介绍了传统漏洞挖掘技术的研究现状,涉及的技术包括模型检测、二进制比对、模糊测试、符号执行以及漏洞可利用性分析等,并分析了各项技术存在的问题,提出当前的研究难点是实现漏洞挖掘全自动化。然后,介绍了机器学习和深度学习技术在漏洞挖掘领域的应用,具体应用场景包括二进制函数识别、函数相似性检测、测试输入生成、路径约束求解等,并提出了其存在的机器学习算法不够健壮安全、算法选择依靠经验、数据样本不足、特征选择依赖专家知识等问题。最后,对未来研究工作进行了展望,提出应该围绕提高漏洞挖掘的精度和效率、提高自动化和智能化的程度这2方面展开工作。
Abstract:In recent years, the increasing size and complexity of software packages has led to vulnerability discovery techniques gradually becoming more automatic and intelligent. This paper reviews the search characteristics of both traditional vulnerability discovery techniques and learning-based intelligent vulnerability discovery techniques. The traditional techniques include static and dynamic vulnerability discovery techniques which involve model checking, binary comparisons, fuzzing, symbolic execution and vulnerability exploitability analyses. This paper analyzes the problems of each technique and the challenges for realizing full automation of vulnerability discovery. Then, this paper also reviews machine learning and deep learning techniques for vulnerability discovery that include binary function identification, function similarity detection, test input generation, and path constraint solutions. Some challenges are the security and robustness of machine learning algorithms, algorithm selection, dataset collection, and feature selection. Finally, future research should focus on improving the accuracy and efficiency of vulnerability discovery algorithms and improving the automation and intelligence.
基于Landsat-8影像的西宁市南北山森林生物量估测模型研究
Estimation of Forest Biomass Model of North and South Mountains Based on Landsat-8 Remote Sensing Image Data in Xining

杨伟志,赵鹏祥,薛大庆,,张晓莉,王志
- , 2016, DOI: 10.3969/j.issn.1001-7461.2016.02.06
Abstract: 基于Landsat-8遥感影像结合同期的野外调查样地数据,建立青海省西宁市南北山森林生物量估测模型。通过对Landsat-8遥感数据6个原始波段的灰度值和4个常用植被指数(DVI、NDVI、EVI、SAVI),开展主成分分析后得到主分量PCA1、缨帽变换得到BRIGHT、GREEN、WET,分析遥感信息与生物量的相关性,运用逐步回归分析法建立研究区森林生物量回归估测模型:B=119.495+3.704E-24eDVI+0.026OLI-52-3.478OLI-5(R2=0.554,p<0.01),经检验模型的平均相对误差为13.509%,反演得到西宁市单位面积森林生物量为5.227 t/hm2,总森林生物量为998 991.768 t。结合西宁市遥感影像,绘制了西宁市森林生物量分布图。
Based on Landsat-8 remote sensing image data,combined with field survey data during the same period,a forest biomass estimating model of North and South Mountains in Xining,capital of Qinghai Province was established.Different band spectral reflectances of each plot were obtained,and the vegetation indices,bright,green,wet and derived factors by linear or nonlinear transformation were computed by using ENVI software.In order to select appropriate factors as variables for the establishment of forest biomass model,the correlations between those factors and forest biomass were calculated.The multiple regression model was built using stepwise regression analysis.Model B=119.495+3.704E-24eDVI+0.026OLI-52-3.478OLI-5 could be used to estimate forest biomass in Xining,its multiple correlation coefficient was 0.554 (p<0.01).The predicted average relative error was 13.509%.The results showed that the average forest biomass density of Xining was 5.227 t?hm-2,and the total forest biomass was 998 991.768 t
工业脂肪酶在洗毛中的应用
Application of Industrial Lipase in Wool Scouring
 [PDF]

肖蒙, 冯冠, 爱芹
Hans Journal of Chemical Engineering and Technology (HJCET) , 2015, DOI: 10.12677/HJCET.2015.56019
Abstract: 将工业脂肪酶应用于原毛洗毛,通过单因素实验探究了酶用量、温度、pH值、时间及浴比等因素对洗净毛含脂率的影响。获得合适的洗毛工艺参数为:酶用量在0.5%左右,pH值在8.0左右,浴比1:40左右,温度在60℃左右,时间2 h左右。还筛选出合适的洗毛促进剂与工业脂肪酶进行复配,以改善洗毛效果,工业脂肪酶与促进剂HM A-474B的最佳配比为1:2,对于以该比例配制的酶制剂,洗毛时的最佳用量在0.1 g/L左右。
Industrial lipase was applied in raw wool scouring. The effects of many factors, such as enzyme dosage, temperature, pH, time and bath ratio, on the fat content of the scoured wool were investi-gated. The suitable parameters were obtained, including enzyme dosage 0.5%, pH 8.0, bath ratio 1:40, temperature 60?C and time about 2 h. In order to improve the scouring effect, a suitable scouring accelerator, HM A-474B, was selected and compounded with the industrial lipase. It’s observed that the best ratio of lipase to HM A-474B was 1:2, and the optimum amount of this en-zyme synergist in scouring was about 0.1 g/L.
德兴铜矿露天爆破技术的改进

金属矿山 , 2007,
Abstract: 为提高爆破安全性,改善爆破效果,从改进炸药、起爆器材、起爆网络、孔网参数、装药结构入手,总结了德兴铜矿近几年爆破所取得的成果,分析了有待改进的问题,其成果和经验可供类似矿山参考。
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