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Experimental study of POE dope dyeing for solar cell encapsulation films in a cavity transfer mixer 认领 引用
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作者 Zhengming Gao Jia Chen +2 位作者 Zhipeng Li Junhao Wang Ziqi Cai 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2026年第3期295-302,共8页
Dope dyeing technology offers a cost-effective and simple solution for producing colored photovoltaic encapsulation films on a large scale.The dispersion quality of micro amount of pigments is critical for light trans... Dope dyeing technology offers a cost-effective and simple solution for producing colored photovoltaic encapsulation films on a large scale.The dispersion quality of micro amount of pigments is critical for light transmittance and photoelectric conversion efficiency.To achieve the uniform dispersion,mixing performance of pigments using a twin-screw extruder and a cavity transfer mixer(CTM)was comparatively investigated under identical processing conditions.Qualitative analysis was evaluated through electron microscopy of agglomerate and element distribution.Quantitative analysis was evaluated by CIE L*A*B*color space and color difference.The results revealed that CTM-processed samples,under identical conditions,achieved a significantly higher degree of dispersion uniformity.Building on this,the study systematically analyzed the impact of varied operational parameters within the CTM on both mixing and color performance.This provides a crucial foundation and a feasible strategy for developing multi-colored solar encapsulation films with enhanced visual characteristics. 展开更多
关键词 Mixing performance Cavity transfer mixer Polymer compounding Colored PV modules
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A numerical study on blending hydrogen into natural gas pipeline by the SMV static mixer:Mixing performance and mass transfer mechanism 认领 引用
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作者 Tao Di Xu Sun +3 位作者 Peng-Chao Chen Hong-Yu Zhou Qi-Yu Huang Xiao-Ben Liu 《Petroleum Science》 SCIE EI CAS CSCD 2026年第3期1469-1486,共18页
Hydrogen is an important clean energy carrier that contributes to the carbon neutrality by reducing the dependence on fossil fuels.As its role in the global energy system continues to expand,the demand for the hydroge... Hydrogen is an important clean energy carrier that contributes to the carbon neutrality by reducing the dependence on fossil fuels.As its role in the global energy system continues to expand,the demand for the hydrogen blended natural gas transportation is steadily rising,which brings a new challenge of the uniform mixing for the safe and efficient long-distance transmission.In this study,the mixing performance of the Sulzer SMV static mixer for hydrogen blending in natural gas pipelines is investigated numerically.Using the large eddy simulation method,and a detailed parametric analysis of geometric factors including element orientation,aspect ratio,twist angle,and spacing are conducted.The results indicate that the SMV mixer markedly enhances the mixing of hydrogen and methane.Increasing the number of mixing elements from one to six improves the mixing homogeneity but causes a 4.5 times increase in the pressure drop.The flow field visualization and vortex evolution analyses demonstrate that vortex generation plays a dominant role in fluid disturbance and mixing enhancement,with Dean vortices being particularly effective in promoting hydrogen and methane blending.This study provides valuable guidance for the design and optimization of static mixing devices,thereby advancing the hydrogen utilization and improving energy efficiency in sustainable energy systems. 展开更多
关键词 Natural gas pipeline Static mixer Large eddy simulation Hydrogen blending transportation Mixing homogeneity
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MixerKT:A Knowledge Tracing Model Based on Pure MLP Architecture 认领 引用
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作者 Jun Wang Mingjie Wang +3 位作者 Zijie Li Ken Chen Jiatian Mei Shu Zhang 《Computers, Materials & Continua》 SCIE EI 2025年第1期485-498,共14页
In the field of intelligent education,the integration of artificial intelligence,especially deep learning technologies,has garnered significant attention.Knowledge tracing(KT)plays a pivotal role in this field by pred... In the field of intelligent education,the integration of artificial intelligence,especially deep learning technologies,has garnered significant attention.Knowledge tracing(KT)plays a pivotal role in this field by predicting students’future performance through the analysis of historical interaction data,thereby assisting educators in evaluating knowledgemastery and tailoring instructional strategies.Traditional knowledge tracingmethods,largely based on Recurrent Neural Networks(RNNs)and Transformer models,primarily focus on capturing long-term interaction patterns in sequential data.However,these models may neglect crucial short-term dynamics and other relevant features.This paper introduces a novel approach to knowledge tracing by leveraging a pure Multilayer Perceptron(MLP)architecture.We proposeMixerKT,a knowledge tracing model based on theHyperMixer framework,which uniquely integrates global and localMixer feature extractors.This architecture enables more effective extraction of both long-terminteraction trends and recent learning behaviors,addressing limitations in currentmodels thatmay overlook these key aspects.Empirical evaluations on twowidely-used datasets,ASSIS Tments2009 and Algebra2005,demonstrate that MixerKT consistently outperforms several state-of-the-art models,including DKT,SAKT,and Separated Self-Attentive Neural Knowledge Tracing(SAINT).Specifically,MixerKT achieves higher prediction accuracy,highlighting its effectiveness in capturing the nuances of learners’knowledge states.These results indicate that our model provides a more comprehensive representation of student learning patterns,enhancing the ability to predict future performance with greater precision. 展开更多
关键词 Knowledge tracing multilayer perceptron channel mixer sequence mixer
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基于TSMixer-GCN的配电网节点故障检测模型 认领 引用
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作者 陈曦 王浩 +3 位作者 蔡升 高元宏 陈慧 滕轩之 《电工电气》 2026年第3期55-59,共5页
为了快速检测配电网运行过程中发生的短路故障情况并及时定位切除故障节点以减少故障影响,提出了一种基于时间序列混合模型(TSMixer)和图卷积神经网络(GCN)相结合的配电网节点故障检测模型。该模型通过使用TSMixer模型进行时间序列学习... 为了快速检测配电网运行过程中发生的短路故障情况并及时定位切除故障节点以减少故障影响,提出了一种基于时间序列混合模型(TSMixer)和图卷积神经网络(GCN)相结合的配电网节点故障检测模型。该模型通过使用TSMixer模型进行时间序列学习,将提取到的时序特征输入GCN,由GCN建模电网节点之间的拓扑关系,捕获电网拓扑结构下的特征依赖性,实现整体时空建模以检测配电网短路故障。仿真结果表明,所提模型在IEEE 33配电网仿真案例中的有效性和鲁棒性得到了有效验证,该模型拥有远超目前广泛通用模型的性能,具有极高的故障分类准确率。 展开更多
关键词 时间序列混合模型 图卷积神经网络 配电网系统 故障检测 时空拓扑建模
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基于MLP-Mixer-BiGRU融合网络的滚动轴承故障诊断方法 认领 引用 被引量：2
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作者 吴月超 郑波 《科技创新与应用》 2025年第36期157-160,共4页
针对现有方法在一维振动信号空间与时间信息协同提取能力不足等问题,提出一种基于MLP-Mixer-BiGRU融合网络的滚动轴承故障诊断方法。首先,将原始一维振动信号进行连续小波变换,将其转化为时频图像以保留信号的时频域特征。随后,采用MLP-... 针对现有方法在一维振动信号空间与时间信息协同提取能力不足等问题,提出一种基于MLP-Mixer-BiGRU融合网络的滚动轴承故障诊断方法。首先,将原始一维振动信号进行连续小波变换,将其转化为时频图像以保留信号的时频域特征。随后,采用MLP-Mixer网络对时频图像进行分块嵌入与全局特征提取,有效挖掘图像的空间结构信息;进而,将MLP-Mixer网络输出的特征序列输入BiGRU网络,充分捕捉故障特征在时间维度上的动态演化规律与长短期依赖关系。最终,通过全连接层实现故障类别的精准分类。实验结果表明,所提方法有效提升滚动轴承故障诊断的准确率与稳定性。 展开更多
关键词 深度学习 滚动轴承 故障诊断 MLP-Mixer BiGRU 连续小波变换
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Multimodal Convolutional Mixer for Mild Cognitive Impairment Detection 认领 引用
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作者 Ovidijus Grigas Robertas Damaševicius Rytis Maskeli—unas 《Computers, Materials & Continua》 SCIE EI 2025年第7期1805-1838,共34页
Brain imaging is important in detecting Mild Cognitive Impairment(MCI)and related dementias.Magnetic Resonance Imaging(MRI)provides structural insights,while Positron Emission Tomography(PET)evaluates metabolic activi... Brain imaging is important in detecting Mild Cognitive Impairment(MCI)and related dementias.Magnetic Resonance Imaging(MRI)provides structural insights,while Positron Emission Tomography(PET)evaluates metabolic activity,aiding in the identification of dementia-related pathologies.This study integrates multiple data modalities—T1-weighted MRI,Pittsburgh Compound B(PiB)PET scans,cognitive assessments such as Mini-Mental State Examination(MMSE),Clinical Dementia Rating(CDR)and Functional Activities Questionnaire(FAQ),blood pressure parameters,and demographic data—to improve MCI detection.The proposed improved Convolutional Mixer architecture,incorporating B-cos modules,multi-head self-attention,and a custom classifier,achieves a classification accuracy of 96.3%on the Mayo Clinic Study of Aging(MCSA)dataset(sagittal plane),outperforming state-of-the-art models by 5%–20%.On the full dataset,the model maintains a high accuracy of 94.9%,with sensitivity and specificity reaching 89.1%and 98.3%,respectively.Extensive evaluations across different imaging planes confirm that the sagittal plane offers the highest diagnostic performance,followed by axial and coronal planes.Feature visualization highlights contributions from central brain structures and lateral ventricles in differentiating MCI from cognitively normal subjects.These results demonstrate that the proposed multimodal deep learning approach improves accuracy and interpretability in MCI detection. 展开更多
关键词 Magnetic resonance imaging positron emission tomography mild cognitive impairment convolutional mixer classification
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基于Summing Mixer的小型录音棚录音系统设计与实现——某研究院声像中心录音棚建设实例 认领 引用
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作者 刘牧 苑方磊 +1 位作者 宋华华 李杰 《电声技术》 2025年第1期20-25,共6页
小型录音棚通常具有空间小、投资省、设备系统简约以及使用灵活高效等特点。通过设计一个小型录音棚录音系统,提出以Summing Mixer为路由与控制核心的系统整体设计方案,包括拾音系统、数字音频系统、监听系统以及硬件效果器系统等分系... 小型录音棚通常具有空间小、投资省、设备系统简约以及使用灵活高效等特点。通过设计一个小型录音棚录音系统,提出以Summing Mixer为路由与控制核心的系统整体设计方案,包括拾音系统、数字音频系统、监听系统以及硬件效果器系统等分系统设计。通过配备硬件压缩器、限制器、均衡器以及混响器等设备,为小型数字录音系统添加了“模拟味”。最后,探讨了设计系统在录音实践中实现零延迟返送监听、外部设备多链路接入、母带制作路由等技术优势。 展开更多
关键词 录音 小型录音棚 Summing Mixer 系统设计
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基于预训练递归Transformer-Mixer的多维时间序列分类研究 认领 引用
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作者 邓泽先 张云贵 张琳 《计算机工程》 CAS CSCD 北大核心 2025年第5期154-165,共12页
多维时间序列分类在工业、医疗、金融等领域有着广泛应用,在工业产品质量控制、疾病预测、金融风险控制等方面发挥着重要作用。多维时间序列时间依赖关系和空间依赖关系同等重要,传统多维时间序列模型只对时间或空间某一维度重点关注。... 多维时间序列分类在工业、医疗、金融等领域有着广泛应用,在工业产品质量控制、疾病预测、金融风险控制等方面发挥着重要作用。多维时间序列时间依赖关系和空间依赖关系同等重要,传统多维时间序列模型只对时间或空间某一维度重点关注。为此,提出一种基于预训练递归Transformer-Mixer的多维时间序列分类模型PRTMMTSC。模型基于Transformer-Mixer模块充分学习多维时间序列时间和空间的关联关系。为进一步提升分类模型的性能,受异常检测模型的启发,将预训练后的隐藏层特征和残差特征进行融合,并采用PolyLoss损失函数对模型进行训练。为减少模型训练参数量,模型中Transformer-Mixer模块采用递归方式构建,使多层可训练参数量仅为单层Transformer-Mixer参数量。在UEA多维时间数据集上的实验结果表明,所提模型的性能优于对比模型,相较于TARNet模型和RLPAM模型的准确率分别提升3.03%和4.69%。在UEA及IF钢夹渣缺陷分类的消融实验验证预训练方式、Transformer-Mixer模块、残差信息及PolyLoss损失函数的有效性。 展开更多
关键词 多维时间序列分类 Transformer-Mixer模块 机器学习 预训练 IF钢夹渣缺陷预报
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Computation and Validation of Parameter Effects on Lobed Mixer-Ejector Performances 认领 引用 被引量：26
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作者 张靖周 单勇 李立国 《Chinese Journal of Aeronautics》 EI CAS 2005年第3期193-198,共6页
Three-dimensional numerical computation of the flow fields and pumping performances for the lobed mixer-ejector are conducted using full Navier-Stokes equations. In the computation, the inlet of the primary flow uses ... Three-dimensional numerical computation of the flow fields and pumping performances for the lobed mixer-ejector are conducted using full Navier-Stokes equations. In the computation, the inlet of the primary flow uses the mass flowrate boundary condition. The inlet of the second flow and the outlet of the mixing flow use the pressure boundary condition. Compared with the relative experimental resuits, it is shown that the present calculation is reasonable. And a series of numerical studies is performed to obtain the effects of area ratio and length-to-diameter ratio of mixing duct on pumping coefficient and thermal mixing efficiency of a lobed mixer-ejector. 展开更多
关键词 lobed nozzle ejector mixer numerical computation
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The numerical simulation of a new double swirl static mixer for gas reactants mixing 认领 引用 被引量：11
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作者 Zhuokai Zhuang Jingtian Yan +3 位作者 Chenglang Sun Haiqiang Wang Yuejun Wang Zhongbiao Wu 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2020年第9期2438-2446,共9页
For the nitrogen oxide removal processes,high performance gas mixer is deeply needed for the injection of NH3 or O3.In this study,a new type of double swirl static mixer in gas mixing was investigated using computatio... For the nitrogen oxide removal processes,high performance gas mixer is deeply needed for the injection of NH3 or O3.In this study,a new type of double swirl static mixer in gas mixing was investigated using computational fluid dynamics(CFD).The results obtained using Particle Image Velocimetry(PIV)correlated well with the results obtained from simulation.The comparisons in pressure loss between the experimental results and the simulation results showed that the model was suitable and accurate for the simulation of the static mixer.Optimal process conditions and design were investigated.When L/D equaled 4,coefficient of variation(COV)was<5%.The inlet velocity did not affect the distributions of turbulent kinetic energy.In terms of both COV and pressure loss,the inner connector is important in the design of the static mixer.The nozzle length should be set at 4 cm.Taking both COV and pressure loss into consideration,the optimal oblique degree is 450.The averaged kinetic energy changed according to process conditions and design.The new static mixer resulted in improved mixing performance in a more compact design.The new static mixer is more energy efficient compared with other SV static mixers.Therefore,the double swirl static mixer is promising in gas mixing. 展开更多
关键词 CFD PIV Gas mixing Double swirl static mixer Pressure loss
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An experimental study of immiscible liquid–liquid dispersions in a pump–mixer of mixer–settler 认领 引用 被引量：8
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作者 Qiao Tang Jiyizhe Zhang +2 位作者 Yuxin Wu Yundong Wang Zuohua Liu 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2020年第1期33-45,共13页
Drop size distribution(DSD) or mean droplet size(d32) and liquid holdup are two key parameters in a liquid–liquid extraction process. Understanding and accurately predicting those parameters are of great importance i... Drop size distribution(DSD) or mean droplet size(d32) and liquid holdup are two key parameters in a liquid–liquid extraction process. Understanding and accurately predicting those parameters are of great importance in the optimal design of extraction columns as well as mixer–settlers. In this paper, the method of built-in endoscopic probe combined with pulse laser was adopted to measure the droplet size in liquid–liquid dispersions with a pump-impeller in a rectangular mixer. The dispersion law of droplets with holdup range 1% to 24% in batch process and larger flow ratio range 1/5 to 5/1 in continuous process was studied. Under the batch operation condition, the DSD abided by log-normal distribution. With the increase of impeller speed or decrease of dispersed phase holdup, the d32 decreased. In addition, a prediction model of d32 of kerosene/deionized system was established as d32/D = 0.13(1 + 5.9φ)We-0.6. Under the continuous operation condition, the general model for droplet size prediction of kerosene/water system was presented as d32/D = C3(1 + C4φ)We-0.6. For the surfactant system and extraction system, the prediction models met a general model as d32/D = bφnWe-0.6. 展开更多
关键词 Dispersion Droplet size distribution Liquid–liquid Mean drop size Mixer–settler
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Power consumption and flow field characteristics of a coaxial mixer with a double inner impeller 认领 引用 被引量：5
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作者 刘宝庆 张义堃 +2 位作者 陈明强 厉鹏 金志江 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2015年第1期1-6,共6页
A coaxial mixer meeting the actual demand of a system with high and variable viscosity is investigated. It has an outer wall-scraping frame and a double inner impeller consisting of a four-pitched-blade turbine and Ru... A coaxial mixer meeting the actual demand of a system with high and variable viscosity is investigated. It has an outer wall-scraping frame and a double inner impeller consisting of a four-pitched-blade turbine and Rushton turbine. The power consumption and flow field characteristics of the coaxial mixer in laminar and transitional flow are simulated numerically, and then the distribution of velocity field, shear rate and mass flow rate are analyzed. The simulation results indicate that the outer frame has little effect on the power consumption of the double inner impeller whether in laminar or transitional flow, whereas the inner combined impeller has a great effect on the power consumption of the outer frame. Compared with the single rotation mode, the power consumption of the outer frame will decrease in co-rotation mode and increase in counter-rotation mode. The velocity, shear rate and mass flow rate are relatively high near the inner impeller in all operating modes, and only under double-shaft agitation will the mixing performance near the free surface be improved.In addition, these distributions in the co-rotation and counter-rotation modes show little difference, but the co-rotation mode is recommended for the advantage of low power consumption. 展开更多
关键词 Coaxial mixer Power consumption Flow field characteristics Numerical simulation
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CFD-PBM coupled modeling of the liquid-liquid dispersion characteristics and structure optimization for Kenics static mixer 认领 引用 被引量：6
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作者 Junhai Deng Shilin Lan +4 位作者 Juchang Wu Shenghua Du Weidong Liu Luchang Han Yefeng Zhou 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2024年第6期173-188,共16页
Kenics static mixers(KSM)are extensively used in industrial mixing-reaction processes by virtue of high mixing efficiency,low power homogenization and easy continuous production.Resolving liquid droplet size and its d... Kenics static mixers(KSM)are extensively used in industrial mixing-reaction processes by virtue of high mixing efficiency,low power homogenization and easy continuous production.Resolving liquid droplet size and its distribution and thus revealing the dispersion characteristics are of great significance for structural optimization and process intensification in the KSM.In this work,a computational fluid dynamics-population balance model(CFD-PBM)coupled method is employed to systematically investigate the effects of operating conditions and structural parameters of KSM on droplet size and its distribution,to further reveal the liquid-liquid dispersion characteristics.Results indicate that higher Reynolds numbers or higher dispersed phase volume fractions increase energy dissipation,reducing Sauter mean diameter(SMD)of dispersed phase droplets and with a shift in droplet size distribution(DSD)towards smaller size.Smaller aspect ratios,greater blade twist and assembly angles amplify shear rate,leading to smaller droplet size and a narrower DSD in the smaller range.The degree of impact exerted by the aspect ratio is notably greater.Notably,mixing elements with different spin enhance shear and stretching efficiency.Compared to the same spin,SMD becomes 3.7-5.8 times smaller in the smaller size range with a significantly narrower distribution.Taking into account the pressure drop and efficiency in a comprehensive manner,optimized structural parameters for the mixing element encompass an aspect ratio of 1-1.5,a blade twist angle of 180°,an assembly angle of 90°,and interlaced assembly of adjacent elements with different spin.This work provides vital theoretical underpinning and future reference for enhancing KSM performance. 展开更多
关键词 CFD Population balance Liquid-liquid dispersion Kenics static mixer
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CFD simulation of hydrodynamics and mixing performance in dual shaft eccentric mixers 认领 引用 被引量：5
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作者 Songsong Wang Xia Xiong +5 位作者 Peiqiao Liu Qiongzhi Zhang Qian Zhang Changyuan Tao Yundong Wang Zuohua Liu 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2023年第10期297-309,共13页
This work aims to systematically study hydrodynamics and mixing characteristics of non-Newtonian fluid(carboxyl methyl cellulose,CMC)in dual shaft eccentric mixer.Fluid rheology was described by the power law rheologi... This work aims to systematically study hydrodynamics and mixing characteristics of non-Newtonian fluid(carboxyl methyl cellulose,CMC)in dual shaft eccentric mixer.Fluid rheology was described by the power law rheological model.Computational fluid dynamics was employed to simulate the velocity field and shear rate inside the stirred tank.The influence mechanism of the rotational modes,height difference between impellers,impeller eccentricities,and impeller types on the flow field have been well investigated.We studied the performance of different dual-shaft eccentric mixers at the constant power input with its fluid velocity profiles,average shear strain rate,mixing time and mixing energy.The counter-rotation mode shows better mixing performance than co-rotation mode,and greater eccentricity can shorten mixing time on the basis of same stirred condition.To intensify the hydrodynamic interaction between impellers and enhance the overall mixing performance of the dual shaft eccentric mixers,it is critical to have a reasonable combination of impellers and an appropriate spatial position of impellers. 展开更多
关键词 Dual shaft eccentric mixers Non-Newtonian fluid Mixing Laminar flow Computational fluid dynamics
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一种应用于GNSS射频接收机的高增益、低噪声LNA+Mixer 认领 引用
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作者 杨贤成 熊娟 《电子技术应用》 2025年第11期59-64,共6页
提出了一种基于标准0.18μm互补金属氧化物半导体(Complementary Metal Oxide Semiconductor,CMOS)工艺的射频前端集成电路设计方案,针对全球定位系统(Global Positioning System,GPS)L1和北斗B1双模导航系统的应用需求,提升了低噪声放... 提出了一种基于标准0.18μm互补金属氧化物半导体(Complementary Metal Oxide Semiconductor,CMOS)工艺的射频前端集成电路设计方案,针对全球定位系统(Global Positioning System,GPS)L1和北斗B1双模导航系统的应用需求,提升了低噪声放大器(Low-Noise Amplifier,LNA)与下变频混频器的关键性能指标。在电路架构方面,针对低噪声放大器,创新性地采用感应源退化技术,通过外部电容与栅源电容并联有效降低了噪声系数;而对于下变频混频器模块,则选用了具有结构优势的无源单平衡拓扑,在保证转换增益的同时显著改善了线性度指标并降低了1/f噪声干扰。测试结果显示,该方案在1.8 V电压下实现60 dB链路增益和2 dB噪声系数,整体功耗仅22 mW。系统集成测试中,当输入功率为-100 dBm时,输出中频功率达3.15 dBm。 展开更多
关键词 GPS/北斗 低噪声放大器 混频器 0.18μm CMOS工艺
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NUMERICAL INVESTIGATION OF AERODYNAMIC AND MIXING CHARACTERISTICS OF SCARFED LOBED MIXER FOR TURBOFAN ENGINE EXHAUST SYSTEM 认领 引用 被引量：12
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作者 单勇 张靖周 徐亮 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI 2009年第2期130-136,共7页
The flow field and aerodynamic performances for the scarfed lobed forced mixer are studied based on a computational fluid dynamics（CFD） technique. A series of computations are conducted to obtain the effects of the ... The flow field and aerodynamic performances for the scarfed lobed forced mixer are studied based on a computational fluid dynamics（CFD） technique. A series of computations are conducted to obtain the effects of the bypass ratio and the scarf angle on the mixing performance for the scarfed lobed mixer. Results show that the scarfed lobed mixer is reduced in the system weight. Meanwhile, aerodynamic performances are slightly improved compared with the normal lobed mixer. Two reasons for causing the mixing enhancement between the core and the bypass flow are as follows： （1） The stream-wise vortices shed from the training edge of the half/full scarfed lobed mixer earlier is enhanced by about 25%. （2） The mixing augmentation is also associated with the increase of the interface length caused by scarfing. The thermal mixing efficiency is enhanced with the increase of the bypass ratio and the scarfing angle. The scarfed lobed mixer design has no negative effects on the pressure loss. The total pressure recovery coefficient reaches above 0. 935 in various bypass ratios and scarfed angles. As the bypass ratio increases, the total pressure recovery coefficient also increases for the scarfed lobed mixer. 展开更多
关键词 aerodynamics numerical simulation mixers scarfed lobed nozzle aerodynamic characteristics
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Analysis and Design of a Quadrature Down-Conversion Mixer for UHF RFID Readers 认领 引用 被引量：4
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作者 倪熔华 谈熙 +1 位作者 唐长文 闵昊 《Journal of Semiconductors》 CAS 北大核心 2008年第6期1128-1135,共8页
A quadrature mixer with a shared transconductor stage is analyzed,including voltage conversion gain, linearity, noise figure, and image rejection. The analysis indicates it has better performance than a conventional G... A quadrature mixer with a shared transconductor stage is analyzed,including voltage conversion gain, linearity, noise figure, and image rejection. The analysis indicates it has better performance than a conventional Gilbert mixer pair in commutating mode. A quadrature down-conversion mixer based on this topology is designed and optimized for an ultra high frequency RFID reader. Operating in the 915MHz ISM band, the presented quadrature mixer measures a conversion gain of 12.5dB,an IIP3 of 10dBm, an IIP2 of 58dBm, and an SSB noise figure of 17.6riB. The chip was fabricated in a 0. 18μm 1P6M RF CMOS process and consumes only 3mA of current from a 1.8V power supply. 展开更多
关键词 quadrature mixer shared transconductor stage RFID reader CMOS low power high linearity
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Transfer Characteristics in Mechanically Stirred Airlift Loop Reactors with or without Static Mixers 认领 引用 被引量：5
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作者 吕效平 王延儒 时钧 《Chinese Journal of Chemical Engineering》 SCIE EI CAS 2000年第3期208-211,共4页
The mechanically stirred internal loop airlift reactors equipped with or without static mixers are devised for intensification of gas-liquid mass transfer rate. The influences of superficial gas velocity, agitation or... The mechanically stirred internal loop airlift reactors equipped with or without static mixers are devised for intensification of gas-liquid mass transfer rate. The influences of superficial gas velocity, agitation or static mixers on gas hold-up, mixing time, liquid circulating velocity and volumetric mass transfer coefficient have been investigated with tap water and carboxymethyl cellulose (CMC) aqueous solution. The experimental results indicate that mechanical agitation is more efficacious than static mixer in highly viscous media for improving mass transfer in airlift reactors. The empirical correlation of volumetric mass transfer coefficient with apparent viscosity, and energy consumption for mechanical agitation and aeration is developed. 展开更多
关键词 airlft loop reactor static mixer stirrer hydrodynamics mass transfer
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Preparation of high-purity neodymium chloride by solvent extraction in the mixer-settlers: A pilot-scale investigation 认领 引用 被引量：6
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作者 Fujian Li Qiaoyan He +3 位作者 Yanliang Wang Hong Zhou Shuibo Zhang Xiaoqi Sun 《Journal of Rare Earths》 SCIE EI CAS CSCD 2017年第11期1133-1140,共8页
A novel purification process based on mixer-settlers for high-purity NdClwas developed. Acidic solution and pure NdClsolution were compared to scrub the less-extractable rare earths(REs)(La, Ce, and Pr)from loaded org... A novel purification process based on mixer-settlers for high-purity NdClwas developed. Acidic solution and pure NdClsolution were compared to scrub the less-extractable rare earths(REs)(La, Ce, and Pr)from loaded organic phase. The extractant with low-degree saponification was evaluated to remove the more-extractable element(Sm). Then the RE impurities(La, Ce, Pr, and Sm) in Nd were purified by an integrated process. Furthermore, effect of smuggling behavior on the purification of NdClin mixersettlers was studied. Based on the investigation mentioned above, the pilot-scale purification process for NdClwith a purity of 99.999% was developed, and the total recovery was about 99%. 展开更多
关键词 Solvent extraction Purification Neodymium High-purity Mixer-settlers
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Computational fluid dynamics(CFD) simulation of effect of baffles on separation in mixer settler 认领 引用 被引量：13
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作者 Mohsen Ostad Shabani Ali Mazahery +4 位作者 Mehdi Alizadeh Ali Asghar Tofigh Mohammad Reza Rahimipour Mansour Razavi Alireza Kolahi 《International Journal of Mining Science and Technology》 EI CAS 2012年第5期703-706,共4页
The main ideas in the development of the solvent extraction mixer settler focused on achieving clean phase separation,minimizing the loss of the reagents and decreasing the surface area of the settlers.The role of baf... The main ideas in the development of the solvent extraction mixer settler focused on achieving clean phase separation,minimizing the loss of the reagents and decreasing the surface area of the settlers.The role of baffles in a mechanically agitated vessel is to ensure even distribution,reduce settler turbulence,promote the stability of power drawn by the impeller and to prevent swirling and vortexing of liquid,thus,greatly improving the mixing of liquid.The insertion of the appropriate number of baffles clearly improves the extent of liquid mixing.However,excessive baffling would interrupt liquid mixing and lengthen the mixing time.Computational fluid dynamics(CFD) provides a tool for determining detailed information on fluid flow(hydrodynamics) which is necessary for modeling subprocesses in mixer settler.A total of 54 final CFD runs were carried out representing different combinations of variables like number of baffles,density and impeller speed.CFD data shows that amount of separation increases with increasing baffles number and decreasing impeller speed. 展开更多
关键词 Mixer settler Computational fluid dynamics Liquid-liquid Efficiency
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