Abstract A micro-channel with thermally induced flow as the mechanism is proposed. The composed of quadrangles constant and different temperatures. characteristics gases within micro-channels are scrutinized by employing a Direct Simulation Monte Carlo (DSMC) approach. effects temperature difference periodic length on gas pumping capacity analyzed, respectively. findings reveal that velocity escalates in conjunction an augmented gradient, thereby signifying enhancement efficacy...

We propose a new hybrid magnetometer that operates in wide frequency range from dc to over 30 kHz and has very high resolution. It is made coaxial structure by combining pT-level fundamental mode orthogonal fluxgate search coil magnetometer. A consisting of cylindrical magnetic core (5 cm long), primary (800 turns) feedback (10 used. The thin sensor head partially inserted the inner bore structure. Magnetic interference minimized using hair-pin U-shaped wire for head. sensitivity increased...

摘要: 锂离子电池是电动汽车和储能系统最重要的组成部分,其故障预测和健康管理对于运行维护至关重要。数据驱动的方法较基于模型的方法更适合大规模工程应用,针对实际应用中工况复杂和数据质量较差的场景,提出数据驱动的健康状态综合评分及异常筛选算法,具有较强的适应性。首先,针对电池实际运行工况提出一种新的特征提取方案,可适用于非恒流的不稳定工况。开发了基于多维特征和混合聚类算法的健康状态综合评分体系,该方案采用无监督学习的算法框架,对可提取特征的数量和质量要求不高,无需进行事先的模型训练和复杂的超参数调整。然后,在麻省理工学院和斯坦福大学提供的公开数据集进行了算法验证,基于电池生命周期各阶段特征集进行健康度等级预测,并应用于健康度高低分选,均能达到92%以上的准确率。在某用户侧储能电站实现了该算法的应用,采用早期运行数据即可快速筛选异常电池,有利于尽早维护,提高电池系统的安全性和经济性。

Nowadays, SaaS is increasingly used by web-based applications for the benefits and profits it brings to both users service providers. It significative if providers can automatically convert traditional into mode, a SaaSify tool needed urgently. In this paper, we analyze conclude new challenges of application, propose several key technologies SaaSifying, further Flow Language (SFL) model implement process, finally, use case study show effects proposed tool, performance experiments prove that...

Fundamental mode orthogonal fluxgates (FM-OFGs) can be made very thin so that one assemble them in an array to image magnetic field distributions. The dc-biased ac excitation current is fed the U-shaped wire core of sensor head; therefore, enclose area by path, which small. Due high sensitivity FM-OFG, tiny but substantial (several hundreds pT) sinusoidal oscillations are visible output when two FM-OFGs placed close another. frequencies such found exactly difference independently operated...

Abstract As a kind of fluid machinery, the roots vacuum pump is widely used in metallurgical industry and semiconductor industry. The double-blade system due to its easy manufacture low cost. pumping process can be divided into four distinctive processes (i.e. sucking process, transferring backlashing exhausting process). characteristics each are illustrated sufficiently this paper. Based on ideal gas laws, thermodynamics model established influence leakage taken consideration. Using model,...

In Knudsen pumps with geometric configuration of rectangle, gas flows are induced by temperature gradients along channel walls. this paper, the direct simulation Monte Carlo (DSMC) method is used to investigate numerically flow characteristics H2–N2 mixtures in pump. The variable soft sphere (VSS) model applied depict molecular diffusion mixtures, and results obtained compared those calculated from a hard (VHS) model. It demonstrated that pressure crucial affecting variation pattern, but...

In order to meet the calculating requirements of high speed and miniaturized turbomolecular pump (TMP), a new modeling method is proposed for rotor-stator row. same Cartesian coordinate system, analytical equations blade row are derived according real three-dimensional geometric model. A self-defining procedure written simulate flow gas molecules in TMP based on test particle Monte Carlo method. The not only can calculate transmission probability rotor row, stator but also evaluate pumping...

Moisture greatly affects the performance of Li-ion batteries, so LiNi1/3Co1/3Mn1/3O2 (NCM111) powder is usually dried in vacuum before slurry preparation. In this paper, vacuum-drying experiments NCM111 were performed first and effects different conditions investigated. Then, experimental data fitted to nine mathematical models, Weibull model was best one describe drying kinetics. The relationship between parameters established verified. Moreover, effective diffusivities determined using...

The power distribution strategy of hybrid sources is an important issue for fuel cell vehicles. A good control can realize the optimal vehicle energy, which save energy and improve operating conditions source. Therefore, this article proposes a strategy. First, in order to solve problems existing model lithium-ion battery model, improved system with better dynamic performance was established Simulink. Second, ensure durability system, operation constraints are added Finally, allocation...

Article Study on Gas Flow Characteristics in Automobile Micro Sensors Longkang Han 1, Feng 2,*, Ruquan Liang 2, Jianhui Shi Dengbo Zhang Yuanmei Song 2 and Kun Sun 3 1 School of logistics, Linyi University, 276000, China Mechanical Vehicle Engineering, Mechatronics Anhui University Science Technology, Huainan 232001, * Correspondence: hanfeng@lyu.edu.cn Received: 25 July 2024; Revised: 14 August Accepted: 22 Published: 5 September 2024 Abstract: gas sensors are integral to the automotive...

This paper analyses the current technical limitations in monitoring Web services which mainly focus on lower layers rather than application layer TCP/IP stacks. So, puts forward an indicator and model system, proposes some technologies to monitor services. The indicators add userspsila behavior features comparing with technologies, integrates concerning browser activities higher protocol For realizing indicators, key are given insert tags HTML files indicating link center sending information...