Influence Of Adjustable Parameters Research Articles

A method for point-contact conjugate tooth surfaces with a constant instantaneous transmission ratio generated by point-contact conjugate involute helicoids

Point-contact conjugate tooth surfaces are insensitive to manufacturing errors and assembly errors and have no transmission errors. However, design conditions for the current method of generating point-contact conjugate tooth surfaces are strict or lacking. This study proposed a method for point-contact conjugate tooth surfaces with a constant instantaneous transmission ratio generated by point-contact conjugate involute helicoids. According to relative motions of single- and two-degree-of-freedom in generating, design criteria were given and a mathematical model of the method was established. The mechanism of point-contact conjugate tooth surfaces was obtained by investigating the relationship between the engagement lines/surfaces, and kinematics was studied, in which the mechanism with a constant instantaneous transmission ratio was geometrically analysed. Based on this method, four types of point-contact conjugate worm drives were studied, in which two novel types of worm drives were developed, i.e., a point-contact conjugate toroidal involute (TI) worm drive, and a point-contact conjugate involute cylindrical (ZI) worm drive. The method was validated for correctness using numerical simulations and meshing tests and the influence of adjustable parameters on the meshing performance was outlined.

3dSpAn: An interactive software for 3D segmentation and analysis of dendritic spines.

Three-dimensional segmentation and analysis of dendritic spine morphology involve two major challenges: 1) how to segment individual spines from the dendrites and 2) how to quantitatively assess the morphology of individual spines. To address these two issues, we developed software called 3dSpAn (3-dimensional Spine Analysis), based on implementing a previously published method, 3D multi-scale opening algorithm in shared intensity space. 3dSpAn consists of four modules: a) Preprocessing and Region of Interest (ROI) selection, b) Intensity thresholding and seed selection, c) Multi-scale segmentation, and d) Quantitative morphological feature extraction. In this article, we present the results of segmentation and morphological analysis for different observation methods and conditions, including in vitro and ex vivo imaging with confocal microscopy, and in vivo observations using high-resolution two-photon microscopy. In particular, we focus on software usage, the influence of adjustable parameters on the obtained results, user reproducibility, accuracy analysis, and also include a qualitative comparison with a commercial benchmark. 3dSpAn software is freely available for non-commercial use at www.3dSpAn.org .

Evaluation Method of Wind Power Consumption Capacity Based on Multi-Fractal Theory

An analysis model of wind power consumption capacity is established with the multi-fractal theory. Firstly, the fluctuation characteristics of wind power are described through multi-fractal parameters, and the correlation between wind power fluctuation characteristics and consumption capacity are analyzed. Afterwards, the swinging door algorithm (SDA) is applied to divide the wind power curve in the evaluation period, and the fluctuation process with similar characteristics is clustered. Further, a functional analysis model to evaluate wind power consumption capacity is mentioned based on the fluctuation clustering results. Finally, the effectiveness of the method is verified by an example of a regional power grid in China, and the influence of adjustable parameters in the model on the consumption capacity is quantitatively analyzed.

The influence of adjustment parameters on the performance of the combustion process

The paper analyzes the use of natural gas as a motor fuel for an automobile diesel engine of 4CHN 11,0/12,5 dimension and its effect on the indicators of the combustion process depending on the change in the value of the installation angle of advance of fuel injection. It was found that when switching to gas engine fuel, the installation angle of the fuel injection advance can be maintained at the level of basic modification, which makes the conversion process technically simple from the point of view of operation. The values of the parameters characterizing the combustion process when converted to natural gas are within acceptable limits, and a number of parameters even improve their value.

Research on a prototype spark ignition (SI) variable compression ratio engine fitted with a pneumatic energy accumulator

The paper describes investigations performed on a prototype variable compression ratio engine fitted with a pneumatic energy accumulator. The engine was built in the Chair of Vehicles and Basics of Machine Design at Lodz University of Technology. Due to the design and principle of operation, the engine may be an alternative to the already existing VCR engines. The pneumatic energy accumulator fitted in the cylinder head with an additional moving piston allows continuous adjustment of the compression ratio. The system is adaptive and adjusts itself to the engine load, reducing the increment of maximum pressure inside the cylinder. The research focuses on the influence of adjustment parameters of the energy accumulator on the movement of the additional piston and engine performance. Engine operation stability and reproducibility of the cycles has also been investigated. An attempt was made to characterize the engine and the energy accumulator in terms of efficiency and range of applicability (profitability of application).

Prospects for use in exhausted petroleum fields of borehole heat exchangers and artesian water-bearing horizons for supplying heat and hot water

The possibility of using old suspended boreholes at spent petroleum fields for municipal heat supply purposes is considered. It is proposed that sweet water from upper artesian water-bearing horizons be forwarded along a borehole heat exchanger down to the bottom for additional heating. Results of calculations carried out in accordance with the well-known methods are given, and the influence of adjustable parameters on heat extraction efficiency is estimated.

Model for capacity variations of weak-acid and weak-base ion-exchangers as a function of the ionic environment

The ionization of weak-acid and weak-base ion-exchangers is investigated using acid-base titrations. Experiments are performed with gel-type resins Duolite A368 and A375, and with pellicular silica-based supports IBF CM and DEAE Spherodex LS. A method to write reaction schemes is proposed with special attention to weak-base anion-exchangers, and results are modelled with the aid of a computer program. A good agreement between experimental and calculated results is observed. General trends of the titration curves are explained, as well as the influence of adjustable parameters. The question of the variations of the apparent capacity is treated.