检索结果-南通市图书馆

Effect of six kinds of scale inhibitors on calcium carbonate precipitation in high salinity wastewater at high temperatures

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2015年第3期27卷 124-130页

作者： Xiaochen Li baoyu Gao Qinyan Yue Defang Ma Hongyan Rong Pin zhao Pengyou Teng Shandong Key Laboratory of Water Pollution Control and Resource Reuse School of Environmental Science and EngineeringShandong University

Precipitation of calcium carbonate （CaCOs） scale on heat transfer surfaces is a serious and expensive problem widely occurring in numerous industrial processes. In this study, we compared the scale inhibition effect of six kinds of commercial scale inhibitors and screened out the best one （scale inhibitor SQ-1211） to investigate its scale inhibition performance in highly saline conditions at high temperature through static scale inhibition tests. The influences of scale inhibitor dosage, temperature, heating time and pH on the inhibition efficiency of the optimal scale inhibitor were investigated. The morphologies and crystal structures of the precipitates were characterized by Scanning Electron Microscopy and X-ray Diffraction analysis. Results showed that the scale inhibition efficiency of the optimal scale inhibitor decreased with the increase of the reaction temperature. When the concentration of Ca^2＋ was 1600 mg/L, the scale inhibition rate could reach 90.7% at 80℃ at pH 8. The optimal scale inhibitor could effectively retard scaling at high temperature. In the presence of the optimal scale inhibitor, the main crystal structure of CaCOs changed from calcite to aragonite.

关键词： Scale inhibitor Scale inhibition efficiency High salinity High temperature Grystal growth

PROJECTED GRADIENT DESCENT BASED ON SOFT THRESHOLDING IN MATRIX COMPLETION

在线全文

学校读者我要写书评

暂无评论

Journal of Electronics(China) 2013年第6期30卷 517-524页

作者： zhao Yujuan Zheng baoyu Chen Shouning Institute of Signal Processing and Transmission Nanjing University of Posts and Telecommunications College of Mathematics and Information Jiangsu Second Normal University

Matrix completion is the extension of compressed *** compressed sensing,we solve the underdetermined equations using sparsity prior of the unknown ***,in matrix completion,we solve the underdetermined equations based on sparsity prior in singular values set of the unknown matrix,which also calls low-rank prior of the unknown *** paper firstly introduces basic concept of matrix completion,analyses the matrix suitably used in matrix completion,and shows that such matrix should satisfy two conditions:low rank and incoherence *** the paper provides three reconstruction algorithms commonly used in matrix completion:singular value thresholding algorithm,singular value projection,and atomic decomposition for minimum rank approximation,puts forward their shortcoming to know the rank of original *** Projected Gradient Descent based on Soft Thresholding(STPGD),proposed in this paper predicts the rank of unknown matrix using soft thresholding,and iteratives based on projected gradient descent,thus it could estimate the rank of unknown matrix exactly with low computational complexity,this is verified by numerical *** also analyze the convergence and computational complexity of the STPGD algorithm,point out this algorithm is guaranteed to converge,and analyse the number of iterations needed to reach reconstruction *** the computational complexity of the STPGD algorithm to other algorithms,we draw the conclusion that the STPGD algorithm not only reduces the computational complexity,but also improves the precision of the reconstruction solution.

关键词： Matrix Completion (MC) Compressed Sensing (CS) Iterative thresholding algorithm Projected Gradient Descent based on Soft Thresholding (STPGD)

Enhanced detection of ppb-level NO_(2)by uniform Pt-doped ZnSnO_(3)nanocubes

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2022年第6期29卷 1295-1303页

作者： Yaoyu Yin Yanbai Shen Sikai zhao Ang Li Rui Lu Cong Han baoyu Cui Dezhou Wei School of Resources and Civil Engineering Northeastern UniversityShenyang 110819China State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110189China

ZnSnO_(3) nanocubes(ZSNCs)with various Pt concentrations(i.e.,1 at%,2 at%,and 5 at%)were synthesized by a simple one-pot hydrothermal *** microstructures of pure and Pt-doped ZSNCs were characterized by X-ray diffractometry,scanning electron microscopy,transmission electron microscopy,energy-dispersive X-ray spectroscopy,and X-ray photoelectron *** showed that the pure ZSNCs have a perovskite structure with a side length of approximately 600 nm;this length was reduced to 400 nm after Pt *** doping,PtO_(x)(PtO and PtO_(2)) nanoparticles with a diameter of approximately 5 nm were uniformly coated on the surface of the *** investigation of the gas-sensing abilities of the nanocubes showed that the Pt-doped ZSNCs have excellent sensing properties toward nitrogen dioxide(NO_(2)) gas in the operating temperature range of 75-175℃.Among the sensors prepared,that based on 1 at%Pt-doped ZSNCs exhibited the best response of 16.0 toward 500 ppb NO_(2) at 125℃;this response is over 11 times higher compared with that of pure *** enhanced NO_(2) sensing mechanism of the Pt-doped ZSNCs may be attributed to the synergistic effects of catalytic activity and chemical sensitization by Pt doping.

关键词： ZnSnO_(3)nanocubes Pt doping nitrogen dioxide gas sensor

在线全文

学校读者我要写书评

暂无评论

直孔藏纸抑菌性及毒理学安全性评价

造纸科学与技术 2019年第1期38卷 34-39页

作者：张水平高丹张庚宋润杰孙运府益西措姆赵宝玉西北农林科技大学动物医学院陕西杨凌712100 西藏自治区墨竹工卡县农牧局西藏墨竹工卡850200 西藏自治区墨竹工卡县文旅局西藏墨竹工卡850200

采用顶空气相色谱技术,检测以瑞香狼毒根部韧皮为原料所造直孔藏纸的抑菌效果,评价其抑菌性;通过家兔皮肤刺激试验、豚鼠皮肤变态反应试验及二者受试区皮肤的病理组织学变化,综合评价直孔藏纸毒理学安全性。研究结果表明,5 mL的2.9×10^... 详细信息

采用顶空气相色谱技术,检测以瑞香狼毒根部韧皮为原料所造直孔藏纸的抑菌效果,评价其抑菌性;通过家兔皮肤刺激试验、豚鼠皮肤变态反应试验及二者受试区皮肤的病理组织学变化,综合评价直孔藏纸毒理学安全性。研究结果表明,5 mL的2.9×10^(2 )CFU/mL大肠埃希氏菌菌液在培养容器为顶空瓶(20 mL)的条件下,通过气相色谱仪检测二氧化碳信号,简便计算出直孔藏纸抑菌率42.07±0.026%、雪梨纸16.14±0.021%、宣纸12.09±0.046%和新闻纸8.19±0.021%,直孔藏纸抑菌率同等条件下显著高于其他3种纸张;直孔藏纸对家兔皮肤的最高刺激指数为0、无刺激性反应,对豚鼠的皮肤变态反应试验致敏率为0%、致敏强度极轻,且直孔藏纸受试区皮肤病理组织学无异常变化。基于以上研究结果,认为直孔藏纸具有明显抑菌性和一定的安全性。

关键词：直孔藏纸瑞香狼毒顶空气相色谱抑菌性毒理学安全性评价

在线全文

学校读者我要写书评

暂无评论

架空输电线路基础碳排放分析与计算

内蒙古电力技术 2024年第2期42卷 49-54页

作者：赵哲吴数伟董义义叶宝玉张鑫内蒙古电力(集团)有限责任公司呼和浩特010010 电力规划总院有限公司北京100120 内蒙古电力(集团)有限责任公司内蒙古电力经济技术研究院分公司呼和浩特010000

针对输电线路基础在建材生产、建材运输及建造三大阶段的碳排放活动进行了详细分析,基于排放因子法针对性地提出了一种适用于输电线路基础碳排放计算的方法,并将其应用于板柱式基础与挖孔基础的碳排放计算中。结果显示,建材生产阶段的... 详细信息

针对输电线路基础在建材生产、建材运输及建造三大阶段的碳排放活动进行了详细分析,基于排放因子法针对性地提出了一种适用于输电线路基础碳排放计算的方法,并将其应用于板柱式基础与挖孔基础的碳排放计算中。结果显示,建材生产阶段的碳排放是输电线路基础总碳排放的主要组成部分,且不同类型基础的碳排放量存在差异。据此提出了注重设计优化、研发绿色建材等降低输电线路基础碳排放的减排措施。

关键词：架空输电线路碳排放排放因子法减排措施

Advanced lignin-acrylamide water treatment agent by pulp and paper industrial sludge: Synthesis, properties and application

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2013年第12期25卷 2367-2377页

作者： Hongyan Rong baoyu Gao Yanxia zhao Shenglei Sun Zhonglian Yang Yan Wang Qinyan Yue Qian Li Shandong Key Laboratory of Water Pollution Control and Resource Reuse School of Environmental Science and EngineeringShandong University

A novel flocculant LA （lignin-acrylamide polymer）, which was used as aid for aluminum sulfate and polyaluminum chloride in this study, was prepared by grafting acrylamide onto lignin that deriving from pulp and papermaking sludge. Physicochemical properties of LA were measured by X-ray photoelectron spectroscopy and scanning electron microscopy. The experimental outcome indicated acrylamide was grafted onto the lignin backbone successfully. The effects of LA addition were evaluated on coagulation performance and floc characteristics as a function of aluminum （Al） dosage, such as floc size, growth rate, strength and recoverability. Effects of different dosing sequences, Al dosed first and LA dosed first, were also investigated. LA used as coagulant aid markedly enhanced the removal efficiency of turbidity and dissolved organic carbon, especially at low Al dosages. The dissolved organic carbon removal efficiencies of aluminum sulfate and polyaluminum chloride at the Al dosage range selected in this study were improved more than 30% and 5% by LA, respectively. LA dramatically enlarged floc size and it was in the order： Al dosed first 〉 LA dosed first 〉 Al. Floc strength and recoverability were also improved by LA. LA played a significant role in charge neutralization, adsorption and bridging in floc formation.

关键词： pulp and paper industrial sludge graft copolymerization aluminum sulfate polyaluminum chloride floc characteristics

Feedback Quantum Neuron and Its Application

在线全文

学校读者我要写书评

暂无评论

Feedback Quantum Neuron and Its Application

贻贝(Perna viridis)超氧化物歧化酶的纯化及部分性质研究

2005 International Conference on Neural Networks and Brain(ICNN&B’05)

作者： Fei Li Shengmei zhao baoyu Zheng Institute of Signal and Information Processing Nanjing University of Posts and Telecommunications

ISBN: (纸本)0780394224;9780780394223

＜正＞A model of feedback quantum neuron（FQN） is proposed.A novel multi-user detector based on feedback quantum neuron and quantum register is *** analysis is given to the theoretical basis and practical performance of the proposed *** simulation results show that the proposed detector has more powerful properties both in bit error rate and near-far resistance than Hopfield neural network based detector.A multi-user detector based on improved FQN is also proposed and the simulation results have shown that the improved FQN multi-user detector is obviously superior to the FQN multi-user *** performance is close to the optimum multi-user detector.

关键词： Neurofeedback Neurons Detectors Quantum computing Multiuser detection Artificial neural networks Signal processing Hopfield neural networks Information processing Electronic mail

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

天然产物研究与开发 1999年第4期11卷 25-29页

作者：林少琴黄义德詹宝玉福建师大实验中心福州350007

采用55～60 C热处理,硫酸铵分级沉淀和DEAE-SepharoseFF柱层析将贻贝Cu,Zn-SOD纯化到均一程度.每100g鲜贻贝肉可得到SOD制品;总活力3689u,比活力782u/mg,回收率为21%.测得该酶分子最为32 kD,亚基分子量约为16.4 kD,最大紫外吸收波长为26... 详细信息

采用55～60 C热处理,硫酸铵分级沉淀和DEAE-SepharoseFF柱层析将贻贝Cu,Zn-SOD纯化到均一程度.每100g鲜贻贝肉可得到SOD制品;总活力3689u,比活力782u/mg,回收率为21%.测得该酶分子最为32 kD,亚基分子量约为16.4 kD,最大紫外吸收波长为268nm,贻贝Cu,Zn-SOD具有一定的耐热性,较强的抗酸、抗碱及抗脲性.

关键词：贻贝铜锌超氧化物歧化酶纯化性质

在线全文

学校读者我要写书评

暂无评论

茜草对大鼠股骨显微结构的影响

中国骨质疏松杂志 2014年第6期20卷 658-661页

作者：吴晨晨杨小雯王文龙王姗姗曹丹丹马烽王建国路浩赵宝玉西北农林科技大学动物医学院中国陕西省杨陵示范区712100

目的茜草对骨骼具有红染的效果,探索茜草如何影响骨骼的显微结构,是否饲喂茜草对大鼠的内脏器官具有显著的毒害作用。方法本试验选取80只1月龄大鼠,随机分为4组(分别添加茜草量为0%、5%、10%和15%入日粮中),饲喂后0.5、1、3和6个月,采... 详细信息

目的茜草对骨骼具有红染的效果,探索茜草如何影响骨骼的显微结构,是否饲喂茜草对大鼠的内脏器官具有显著的毒害作用。方法本试验选取80只1月龄大鼠,随机分为4组(分别添加茜草量为0%、5%、10%和15%入日粮中),饲喂后0.5、1、3和6个月,采取双侧股骨、内脏和血液。结果饲喂茜草6个月后,10%和15%组大鼠股骨骨干的平均厚度、骨干内径、骨干外径、骨髓腔面积、皮质骨面积、骨干总面积和股骨骨干的骨矿物质密度显著高于0%组大鼠;股骨远端骨小梁体积百分比,骨小梁厚度,连接密度,骨小梁数量和股骨远端的骨矿物质密度的水平均显著高于0%组大鼠,而股骨远端的骨小梁分离度和结构模型指数显著低于0%组大鼠。但是饲喂茜草6个月后,15%组的大鼠血液中尿素氮和肌酐的含量与0%组大鼠之间差异显著。结论饲喂10%茜草对大鼠无毒性影响,并能促进大鼠的骨骼长度和骨的显微结构,为以后茜草的合理应用提供了实验基础。

关键词：茜草大鼠骨显微结构股骨