检索结果-南通市图书馆

Application of response surface methodology for optimization of Orange Ⅱ removal by heterogeneous Fenton-like process using Fe_3O_4nanoparticles

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2014年第11期25卷 1455-1460页

作者： Kun Chen Guang-hua Wang wen-bing Li Dong Wan Qin hu Lu-Lu Lu College of Chemical Engineering and Technology Wuhan University of Science and Technology

In this study, Fe3O4nanoparticles（Fe3O4NPs） were successfully prepared via oxidation–precipitation method and characterized by scanning electron microscopy（SEM）, X-ray diffraction（XRD） and Fourier transform infrared spectroscopy（FT-IR）. The characterization results indicated that Fe3O4 NPs with regular crystal structure and a narrow of diameters had been synthesized successfully and had high purity. A series of experiments were carried out to investigate the degradation of Orange II by the obtained heterogeneous Fe3O4 catalysts in the presence of H2O2. The response surface methodology（RSM） based on Box–Behnken design（BBD） was employed to design and optimize individual and interactive effects of the four main independent parameters（catalyst loading, initial p H, reaction temperature and H2O2concentration） on decolorization efficiency of Orange II. A significant quadratic model（p-value 〈0.0001, R2= 0.9369） was derived using analysis of variance（ANOVA）. Optimum conditions were catalyst loading of 1.5 g/L, initial p H of 2.7, reaction temperature of 42 8C and H2O2 concentration of 22 mmol/L, respectively. The predicted decolorization rate under the optimum conditions as determined by the proposed model was 99.55%. Confirmatory tests were carried out and the decolorization rate of 99.49% was observed under the optimum conditions, which agreed well with the model prediction.

关键词： Fe3O4 nanoparticles Heterogeneous Fenton-like Orange II Response surface methodology

Automatic context induction for tone model integration in mandarin speech recognition

在线全文

学校读者我要写书评

暂无评论

The Journal of China Universities of Posts and Telecommunications 2012年第1期19卷 94-100页

作者： huANG Hao LI bing-hu Department of Information Science and Engineering Xinjiang University Urumqi 830046 China Laboratory of Multi-Lingual Information Technology Xinjiang University Urumqi 830046 China

Tone model （TM） integration is an important task for mandarin speech recognition. It has been proved to be effective to use discriminatively trained scaling factors when integrating TM scores into multi-pass speech recognition. Moreover, context-dependent （CD） scaling can be applied for better interpolation between the models. One limitation of this approach is a large number of parameters will be introduced, which makes the technique prone to overtraining. In this paper, we propose to induce context-dependent model weights by using automatically derived phonetic decision trees. Question at each tree node is chosen to minimize the expected recognition error on the training data. First order approximation of the minimum phone error （MPE） objective function is used for question pruning to make tree building efficient. Experimental results on continuous mandarin speech recognition show the method is capable of inducing the most crucial phonetic contexts and obtains significant error reduction with far fewer parameters, compared with that obtained by using manually designed context-dependent scaling parameters.

关键词： TM integration MPE decision tree mandarin speech recognition context-dependent

Dioxygen affinities and catalytic oxidation performance of cobalt(Ⅱ) hydroxamates with benzo-15-crown-5 pendants

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2007年第1期18卷 103-106页

作者： Hong Bo Li Chuan Qin wen bing Yang Xiao Ping hu Sheng Ying Qin College of Material Science and Engineering Southwest University of Science and Technology Mianyang 621010 China Department of Chemistry Sichuan University Chengdu 610064 China

The oxygenation constants （Ko2） of cobalt（Ⅱ） hydroxamates （CoL^1 2-CoL^3 2） with benzo-15-crown-5 （B15C5） pendants were measured over the range of -5 to ＋20 ℃, and the values of thermodynamic parameters （ΔH^0 and ΔS^0） were calculated based on these （Ko2） values, Meanwhile, these crowned complexes were employed to the oxidation for p-xylene to p-toluic acid with air at 110Δ under normal atmospheric pressure. The effects of B15C5 pendant and the length of chain bonded to B15C5 in these complexes on the O2-binding capabilities and oxidation for p-xylene were investigated with the comparison of crown-free analogues CoL^4 2.

关键词： Benzo-15-crown-5 Cobalt(Ⅱ) hydroxamates Dioxygen affinity Catalytic oxidation p-Xylene

Science Letters:Multi-frequency proportional-resonant (MFPR) current controller for PWM VSC under unbalanced supply conditions

在线全文

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2007年第10期8卷 1527-1531页

作者： hu Jia-bing HE Yi-kang Sehool of Eleetrieal Engineering Zhejiang University Hangzhou 310027 China

This letter presents a multi-frequency proportional-resonant （MFPR） current controller developed for PWM voltage source converter （VSC） under the unbalanced supply voltage conditions. The delta operator is used in place of the shift operator for the implementation of MFPR by using a low-cost fixed-point DSE The experimental results with an alternative control strategy validated the feasibility of the proposed MFPR current controller for the PWM VSC during voltage unbalance.

关键词： PWM VSC Multi-frequency proportional-resonant (MFPR) Voltage unbalance

A classical relativistic hydrodynamical model for strong EM wave-spin plasma interaction

在线全文

学校读者我要写书评

暂无评论

Plasma Science and Technology 2022年第3期24卷 14-18页

作者： Qianglin hu wen hu Department of Physics Jinggangshan UniversityJi'an 343009People's Republic of China

Based on the covariant Lagrangian function and Euler-Lagrange equation,a set of classical fluid equations for strong EM wave-spin plasma interaction is *** shows that the relativistic effects may affect the interaction processes by three factors:the relativistic factor,the time component of four-spin,and the velocity-field *** set of equations can be used to discuss the collective spin effects of relativistic electrons in classical regime,such as astrophysics,high-energy laser-plasma systems and so *** an example,the spin induced ponderomotive force in the interaction of strong EM wave and magnetized plasma is *** show that the time component of four-spin,which approaches to zero in nonrelativistic situations,can increase the spin-ponderomotive force obviously in relativistic situation.

关键词： Lagrangian function strong EM wave spin plasma spin ponderomotive force

Prediction of performance of a non-icebreaking ship in marginal ice zone

在线全文

学校读者我要写书评

暂无评论

Journal of Hydrodynamics 2022年第2期34卷 315-328页

作者： bing hu Lu Liu De-yu Wang Key Laboratory of Ocean Engineering Shanghai Jiao Tong UniversityShanghai200240China Institute of Marine Equipment Shanghai Jiao Tong UniversityShanghai200240China State Key Laboratory of Structural Analysis for Industrial Equipment Dalian University of TechnologyDalian116024China China COSCO Shipping Corporation Limited Shanghai200127China

The Arctic is rapidly transforming into a navigable ocean because of global *** retreat of ice extent and widened marginal ice zone(MIZ)in the Arctic made it possible for non-icebreaking commercial vessels to sail into Arctic waters where ice floes of various concentrations and thicknesses *** main objective of this work is to estimate the performance of a non-icebreaking cargo ship that sails in the Arctic marginal ice *** numerical approaches are utilized to calculate ice-induced resistance and compared with those proposed in empirical *** comparison shows that the resistances predicted by the two numerical tools differ obviously and are in general smaller in comparison with the ones calculated from the empirical formulas under lower ice *** total resistances are further calculated to predict the required propulsion powers for the case study vessel to enable navigation under severe ice *** work highlights the significance of developing new and more sophisticated tools for estimation of ship’s ice performance in MIZ,which is the prerequisite to enable non-icebreaking cargo fleet to utilize the Arctic shipping lane.

关键词： Arctic shipping marginal ice zone(MIZ) pack ice resistance empirical formula numerical methods

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

新型二维声子晶体带隙特性及调控方法研究

大连理工大学学报 2025年第1期65卷 48-55页

作者：胡启国胡皓魏晨胡豁然重庆交通大学机电与车辆工程学院重庆400074 国网重庆市电力公司信息通信分公司重庆401120

为拓宽声子晶体弹性波带隙,提出一种关于基体双侧对称的声子晶体结构模型.采用有限元法计算了该声子晶体的能带结构和本征模态,基于局域共振机理深入分析了其带隙的形成机理,通过改变几何参数及施加等轴预拉伸应变的方法对该声子晶体的... 详细信息

为拓宽声子晶体弹性波带隙,提出一种关于基体双侧对称的声子晶体结构模型.采用有限元法计算了该声子晶体的能带结构和本征模态,基于局域共振机理深入分析了其带隙的形成机理,通过改变几何参数及施加等轴预拉伸应变的方法对该声子晶体的带隙进行被动调控与主动调控.仿真结果表明:所提声子晶体结构基体中的长波行波与振子的谐振相互耦合作用产生一条局域共振带隙,通过优化几何参数可以获得起始频率更低的宽频带隙,对结构施加等轴预拉伸应变可以有效拓宽带隙且带隙宽度随着预拉伸应变的增大而变宽.研究结果为声子晶体的带隙主动调控提供了方案,为结构减振降噪提供了新思路.

关键词：声子晶体带隙特性带隙调控预拉伸应变

Experiment on building a real-time temperature field distribution model of the prostate using special data encryption multi-pole radiofrequency ablation and a visualization phantom

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Science Bulletin 2011年第35期56卷 3845-3853页

作者： CHEN Lei hu bing hu Bin Department of Ultrasound Affiliated Sixth People ＂s Hospital Shanghai Jiaotong University Shanghai 200233 China

The aim of this study was to explore the utility of a visualization phantom for building a real-time temperature field distribution model of the prostate created by the application of special data encryption(SDE) multi-pole radiofrequency(RF) *** prepared phantoms(phantom group) using acrylamide as the raw material and egg-white as a color developing *** prostate specimens of male adult dogs were fixed in this phantom to create a prostate phantom(prostate group).The SDE multi-pole RF electrode was inserted into the two groups for RF ablation,and the temperature changes at relevant points in space were *** set the x-axis as the left and right direction,the y-axis as the fore and aft direction,and the z-axis as the insertion direction of the RF *** this process,the effect of RF ablation on the appearance of each of the two groups was *** temperature measurements taken during the operation,a three-dimensional(3D) surface model of temperature was constructed by drawing the boundary areas of different temperatures on the maximum x-z plane of the two groups of ablation lesions,with y equivalent to *** comparison of the temperature-time change curves of four space points were made by setting y equivalent to 0,z equivalent to 0.5,and x equivalent to 0,0.25,0.5 and *** solid lesions with a diameter of approximately 12 mm could be found in both groups after RF *** the ablation of the phantom group,the temperature ascended faster in a zone 1 cm from the needlepoint to the needle body,and 0.5 cm about the radiofrequency *** time-property result of the x-z plane with y equivalent to 0 showed that the boundary areas of the two groups were closer at 50 and 60°C,but the difference between the two groups at 70°C in the high temperature zone was relatively *** 3D temperature surface model further proved that the 3D temperature outline at 60°C was in better concordance with the actual effect of RF abl

关键词：温度场分布射频消融前列腺癌数据加密分布模型临床试验可视化多极

An analysis of an ethanol-based, whole-crop refinery system in China

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Engineering 2016年第11期24卷 1609-1618页

作者： Zhiqiang Zhang Shanying hu Dingjiang Chen bing Zhu Department of Chemical Engineering Tsinghua University

Bio-fuel can be used to help transition from a petroleum-based society to a bio-based society. Ever since the China Development and Reform Commission suspended the approval of crop processing programs, second-generation bio-ethanol research and industrialization processes have attracted significant attention. In 2020, bio-ethanol production is predicted to reach 10 million tons. Currently, there are a few domestic enterprises that have established different scaled pilot or demonstration bases for cellulosic ethanol, which reduce the cost of ethanol by continuously improving pretreatment and hydrolysis techniques. In the next three years, these enterprises will realize large-scale commercial production. Given the practical problems in cellulosic ethanol plant construction and operation(e.g., marketing price variation and difficulties in feedstock collection), this paper began with the concept of a "whole-crop refinery" and presented a solution to the integration of industry and agriculture as well as multi-crop refining. This paper then took the whole-crop refining system of corn as an example and presented an analysis of the logistics, energy flow, and economical efficiency of the system. The results demonstrated that the integrated system could properly reduce the required fixed investments in production equipment,shared utilities, and wastewater treatment facilities, as well as reduction of energy consumption. Although the proposed system has several problems, it brings the long-term goal of large-scale commercial application closer than ever.

关键词： Whole-crop refinery Cellulosic ethanol Biomass Corn stover