bluuebunny/crossref_metadata_2025_split huggingface dataset:
Asymmetric broadening and blue shift of the stimulated Raman scattering spectrum in water under chirped picosecond laser pulse train excitation
Authors: Pershin Sergey M , Shashkov Evgeny V , Vorobiev Nikolay S , Nikitin Sergey P , Grishin Mikhail Ya , Komel’Kov Anton S 
Published: November 2020

Abstract
For the first time, we have revealed an asymmetric broadening and a 35 cm−1 blue shift (up to 3400 cm−1) of the stimulated Raman scattering OH band in water under chirped picosecond pulse train excitation (pulse duration ∼60 ps with 8 ns interval between pulses) while increasing the train length to 25 pulses. From the observed broadening and shift of the OH band centroid, a lower estimate (≥8 ns) of molecular complexes spectral states relaxation time at room temperature was obtained.
A compact stereotactic system for image-guided surgical intervention
Authors: Rusheen Aaron E , Barath Abhijeet S , Goyal Abhinav , Barnett J Hudson , Gifford Benjamin T , Bennet Kevin E , Blaha Charles D , Goerss Stephan J , Oh Yoonbae , Lee Kendall H 
Published: November 2020

Abstract

Objective. Stereotactic technology enables fine navigation to small structures in the human body. While current stereotactic systems facilitate accurate targeting, they are mechanically cumbersome and limited in scope. Here, we hypothesized that a stereotactic system could be developed with a reduced footprint while maintaining broad targeting capabilities in order to improve versatility in frame placement location and surgical workflow. Approach. We designed a stereotactic system around the center-of-arc principle, with mechanical properties that would enable a compact design and ample targeting and trajectory maneuverability. To examine the opportunity for a low-cost rapidly-deployable system we developed two fabrication variants, one using three dimensional (3D)-printing and the other using conventional machining. Mechanical and image-guided accuracies were tested in phantom studies using magnetic resonance imaging (MRI) and computed tomography. Using human cadaver head specimens, we assessed the system’s surgical workflow and its ability to reliably and accurately implant electrodes in deep brain stimulation (DBS) surgery. Main results. We developed a small 7.7 × 5.4 cm2 device platform that rigidly mounts to curvilinear bone and supports the attachment of surgical instrumentation. Attachment of two surgical instruments, an imaging localizer and a compact targeting device, demonstrated successful MRI-guided intervention in phantom studies with a vector error of 1.79 ± 0.41 mm. Evaluation of the 3D-printed system for DBS surgery confirmed ease of device platform attachment and instrument functionality, as well as demonstrated a surgical targeting accuracy of 1.83 ± 0.15 mm. In addition, we found the surgical time to be 78.3 ± 5.4 min for bilateral electrode implantation. Significance. We developed a light and compact stereotactic system whose accuracy is on par with those used clinically. This technology is suitable for clinical translation and its flexibility in positioning will seamlessly expand the capabilities for stereotaxy to treat a wide range of conditions, both within neurosurgery and beyond.
Development of Vertical Cavity Surface Emitting Laser Modulation for Data Communication
Authors: Cao Yixin 
Published: November 2020

Abstract
This paper includes some basic knowledge of VCSEL and reviews some researches focusing on development of modulation characteristics in data communication of 850nm, 980nm, 1060nm and 1100nm VCSEL, which is helpful to researchers who are studying in this field. The popular modulation in data communication VCSEL is also mentioned in this paper. There are still some difficulties in the modulation of VCSEL-based links directly, which may be solved by modulating relaxation-oscillation frequency of VCSEL in the near future.
The development of low toxic and high efficient solar cells
Authors: Liu Yang 
Published: November 2020

Abstract
Since the perovskite battery was put forward in 2009 for the first time, it is widely believed that it may bring huge influence on the reform of the next generation of solar cells. However, the lead element that are widely used in perovskite battery has strong toxicity which determines that it cannot be widely used in industrial production. Therefore, scientific researchers are trying to replace the lead element with some nontoxic elements or the elements with low toxicity like tin, germanium, bismuth and antimony and so on. Although the photoelectric conversion efficiency of these lead-free perovskite is greatly lower than that of lead-base perovskite, researchers already pay great attention on lead free materials and they have achieved remarkable results. The paper mainly introduces the research situation and development prospect of lead-free perovskite material and related devices.
The Exploration and Outlook of Two-Dimensional Perovskites
Authors: Tong Yi 
Published: November 2020

Abstract
Owing to the low cost and high efficiency in power conversion, perovskites have become a popular material for solar cells. Different from three-dimensional (3D) perovskites, two-dimensional (2D) perovskites tend to acquire high stability and high resistance to moisture. In addition, while lead is a commonly used B cation in 2D perovskites, it brings serious environmental damage. Therefore, people have been trying to replace lead (Pb) with tin (Sn), which is an almost harmless metal, in perovskites. This paper talks about the latest developments of 2D perovskites, as well as their prospect and future research directions.
Design of control and frequency conversion speed regulation system for mine fan
Authors: Zhang Hong-kui , Zhang Qiu-lin , Zhe Wang , Zhang De-peng , Wang Ming 
Published: November 2020

Abstract
In order to improve the accuracy and stability of the control system of mine fan, the control and frequency conversion speed regulation system of mine fan was developed based on PLC. Based on the analysis on control technology for mine fan, puts forward the inverter, soft start double mode control strategy, combined with the design of PLC control system hardware circuit and software program, the realization of mine fan starting and soft start, reasonable speed regulating, stop running process control, at the same time have the parameters such as voltage, current detection and fault protection function.
Simulation analysis on fatigue life of escalator main drive chain
Authors: Liu Xiaochang , Ren Facai , Xue Jiai , Ouyang Huiqing 
Published: November 2020

Abstract
This paper analyzes the fatigue life of the main drive chain of escalator in subway station. By analyzing the force of the main drive chain, the maximum and minimum force values of the main drive chain are obtained. The fatigue life of the main drive chain is analyzed based on the stress and fluctuating load, and the fatigue life of the escalator main drive chain in the subway station is obtained.
Based on Adam Optimization Algorithm: Neural Network Model for Auto Steel Performance prediction
Authors: Pengtao Wang 
Published: November 2020

Abstract
Neural network is optimized using the Adam algorithm, which introduces the first-order and second-order momentum of gradient. At the same time, learning rate is dynamically adjusted to different training stages to avoid the network from slow converging or oscillating. The three-layer neural network model is trained with a 5000 samples data set for HSLA steel performance prediction. The result shows that: compared with the traditional SGD algorithm, Adam shows efficient and stable training characteristics. After 742 epochs with initial learning rate of 0.001, the mean square error (MSE) of training set and validation set are below 90. On a data set consisting of 50 new samples, the prediction error of the yield strength and tensile strength on test set are less than 19MPa and 22MPa respectively, and the elongation prediction error is less than 3.1%.
A Magnetic Dipole Resonator for Magnetic Coupled Resonance Wireless Power Transmission
Authors: Yang Cheng , Hua Xuehui 
Published: November 2020

Abstract
This paper proposes a magnetic dipole structure Resonator for the magnetic coupled resonance wireless power transmission (WPT). The various characteristics are investigated by using simulations. To investigate the advantage of the proposed structure coil, a same geometric size traditional single-layer spiral coil is used for the power transfer characteristics Comparison. Due to the proposed structure, if the magnetic dipole resonator needs to be resonated at the same frequency with the traditional spiral coil, the larger number of turns is needed. This causes the resistance of loss to dramatically increase, thus decreasing the power transfer efficiency. To solve this problem, the tightly coupled parallel-connected coil structure was used. Depending on the characteristics of the tightly coupled parallel-connected coil structure the proposed magnetic dipole resonator can offer significantly reduced resistance with very little self-inductance loss. Simulation results show that compare to the same resonance frequency traditional single-layer spiral coil, a magnetic dipole resonator contributed by the tightly coupled parallel-connected coil structure can increase the Q factor by approximately 54.3%. Moreover, the simulation evaluation results confirmed that the proposed resonator can also dramatically improves the system power transfer flexibility performance.
Design of Plastic Injection Mould for Plastic Bracket
Authors: Ying Wang , Xiaocheng Li , Feng Zhou 
Published: November 2020

Abstract
The side core pulling mechanism of “fixed mold lifer+T-type lift guide block” is adopted for the fixed mold of bracket, and the side core pulling mechanism of “angle pin+slide” and “angle pin+slide+T-type guide block” side core pulling mechanism is adopted for the movable mold of bracket. The gating system adopts the sub gate, the inner reinforcing rib is formed by moving mold insert, and the ejection system is the form of ejector pin+blade ejector pin. It provides a good reference for the design of similar moulds.
Application of core-shell materials in glucose detection
Authors: Cao Lei 
Published: November 2020

Abstract
The development of materials science can make people control material composition morphology through various means. The Core-shell nanoparticles is one of them. According to the adjustment of the shell and the core in a reasonable manner, we were able to prepare different kinds of personalized function materials. Therefore, it has a wide range of application in various fields. This paper focuses on the subdivision of glucose detection, and discusses the successful application of composite core-shell nanoparticles of metal materials and non-metal materials in glucose detection, as well as some existing problems that still need to be solved.
Structural simulation analysis of a certain vehicle type disc brake based on ANSYS Workbench
Authors: Cui Changqing , Liu Na , Bei Taixue , Luo Wei 
Published: November 2020

Abstract
Taking the disc brake as the research object, the three-dimensional model established by Solidworks is imported into ANSYS Workbench, and its strength and modal simulation analysis are carried out. Taking the disc brake as the research object, the 3D model established by SolidWorks is imported into ANSYS Workbench, and the strength and modal simulation analysis are carried out then. Using the maximum stress point and maximum deformation position under the emergency braking state, combined with the results of modal analysis cloud chart, the resonance range is verified by comparing with the natural frequency, which provides reference for the actual tests and structural improvement.
The influence of microstructure on CTOD fracture toughness of DZ125 base metal and brazed joint
Authors: Ma Wenbin , Bai Xue , Luo Hongyun , Yang Xiaoguang 
Published: November 2020

Abstract
The microstructure of the base metal zone and the weld zone of the DZ125 directionally solidified nickel-based superalloy brazed joint is studied by means of scanning electron microscope (SEM), energy dispersive spectroscopy (EDS) and optical microscope. The CTOD fracture toughness of the base metal zone and the weld zone at 950 °C was tested respectively. The results show that the microstructure of the DZ125 alloy base metal grows with dendrites, the arrangement of the dendrites is close, the divergence angle is small, the dendrites are distributed with a uniform and fine γ′ phase, script-shaped MC carbides and petal-shaped γ/γ′ eutectic phases are distributed in the inter-dendrite zone. The uniform γ′ phase is distributed in the weld zone. At 950 °C, the CTOD fracture toughness of base metal and brazed joint is 0.080 mm and 0.048 mm, respectively. The fracture toughness of the base metal is higher than that of the brazed joint. The fracture morphology shows that the base metal has good toughness at 950 °C, while the weld zone has poor toughness at this temperature. It can be inferred that the long needle-shaped M6C carbides will weaken the structure performance.
Finite element analysis of a vehicle diesel engine crankshaft
Authors: Liu Fengliang , Zheng Zhongcai , WeiLuo  , Han Dongyue , Zhang Yifan 
Published: November 2020

Abstract
The crankshaft is the largest moving part in the engine and one of the most important parts in the engine. It bears the force transmitted from the connecting rod and converts this force into torque. The working conditions of the crankshaft are harsh, and its stress conditions are quite complicated. The stress concentration phenomenon is quite serious under the effect of bending and torsion loads, especially in the rounded transition area from the crank to the journal. In addition, the crankshaft has a significant impact on the overall size, weight, reliability, and manufacturing cost of the engine Therefore, the fatigue strength, stiffness, and wear resistance of the journal must be strictly checked and analyzed during the design of the crankshaft. In this paper, the finite element method is used as the main research method to analyze the static strength of a diesel engine crankshaft. The pre-processing software is used to optimize the topology of the crankshaft 1/2 single turn and the tetrahedral meshing. Then the finite element analysis software is imported to set the boundary Condition and apply the load, and finally submit the calculation. According to the working conditions, the crank pin load and the main journal support reaction force are calculated. Through the analysis of the results of crankshaft statics simulation, the weak links of the stress distribution of the crankshaft under dangerous conditions are found, which provides a theoretical basis for the structural design of the crankshaft.
Microstructure and Phase Transition Characteristics of NiTi Shape Memory Alloy
Authors: Shilei Zhao , Kun Zhao , Fuwen Wang 
Published: November 2020

Abstract
Shape memory alloy (SMA) with shape memory effect and superelasticity has had an increasing interest for researchers of mechanics of materials in recent decades. With the deepening of theoretical research, the applications of SMA have also made considerable progress. SMA has a unique solid phase transformation characteristic that is thermoelastic martensitic transformation. The high temperature phase of SMA is austenite, while the low temperature phase of SMA is martensite. Because of the biocompatibility and the corrosion resistance, NiTi shape memory alloy has been widely used in biomedical and aerospace. However, the NiTi binary alloy can only be applied to the ambient temperature, because the phase transformation temperature is lower than 100 centigrade. In order to apply the NiTi based shape memory alloy in the wider field, it is necessary to control the phase transformation temperature, thermal hysteresis latent heat of phase change and other phase transformation behavior and mechanical property effectively and accurately. Thus, it is important to add a third or fourth element to NiTi alloy to form a new type of NiTi based shape memory alloy. The results show that NiTi alloy contains many precipitates such as NiTi2, Ni3Ti2, Ni4Ti3. Adding the third or even the fourth element to the NiTi binary alloy can effectively adjust the phase transition and related mechanical properties of NiTi alloy. In this paper, the research progress of NiTi binary alloys is summarized, the microstructure, types and structures of properties, types and properties of phase transitions of NiTi alloys are introduced respectively, the problems faced by NiTi alloys are analyzed and their prospects are prospected, so as to provide reference for the development of shape memory alloys with better properties.
Building Model of Additive Manufacturing Based on Knowledge Driven
Authors: QianZhou Wei , Xiang Ling , XiaoXu Wang , Yu Zhang 
Published: November 2020

Abstract
This paper combines the current mainstream knowledge graph intelligent recommendation algorithm and the first step in the additive manufacturing process: model design, and proposes a knowledge-driven intelligent recommendation algorithm to be applied to model design. Combining the designer’s historical design habits and the relationship between entities and attributes in the knowledge graph can better improve the accuracy of recommendations. It is verified in the third chapter of this article that the knowledge-driven recommendation algorithm is better than other traditional recommendation algorithms.
Development and Design of Detachable Deep Hole Variable Diameter Boring Tool Device
Authors: Liu Zhanfeng , Wang Kun , Feng Yazhou , Li Zhanhui 
Published: November 2020

Abstract
In order to solve the problem of deep hole processing, the inner reaming of small ends and large middle is difficult to process. Developed and designed a detachable deep hole variable diameter boring tool device with self-centering, replaceable tools, and capable of changing the same diameter of the guide block and the tool and with self-locking function. Introduce in detail the structural features, assembly conditions and design principles of the detachable deep hole variable diameter boring cutter device. It provides an effective solution for the processing of inner reaming in deep holes.
Research on Composition Design of Titanium Microalloyed High-Strength Weathering Steel
Authors: Chen Xuewen , Liao Daobiao , Zhou Feng , Bi Jun , Mo Kangxing 
Published: November 2020

Abstract
Based on the EAF-LF-CSP process and the composition of SPA-H (container board) of JIS G3125, this article analyzes and compares the chemical composition and performance of weathering steel related standards and the proposed high-strength weathering steel. By studying the range of Ti addition, designing the chemical composition of high-strength weathering steel, and developing high-strength steel with a yield strength of 450∼700MPa. The analysis and calculation results show that the optimal Ti content range of weathering steels of various strength grades with yield strength of 450MPa∼700 MPa is 0.05∼0.08%, 0.08∼0.12%, and 0.12∼0.14% respectively, which meets the strength requirements of weathering steels and can be applied in production practice.
Adaptive Control of Additive Manufacturing Equipment Based on Air Bearing Positioning
Authors: Xiang Ling , QianZhou Wei , Yu Zhang 
Published: November 2020

Abstract
The air bearing guide rail is used as the three-dimensional positioning mechanism of additive manufacturing. However, in the high acceleration and high speed high dynamic motion, it is easy to cause the residual vibration of the system, damage the positioning accuracy of the system and increase the stability time of the system. Therefore, under the condition that the expected dynamic and static performance of additive manufacturing equipment is controllable, the robust adaptive control is used to compensate manufacturing error and environmental disturbance. According to Lyapunov stability theory, the established controller is adjusted to ensure the global asymptotic stability of the whole control system, so as to improve the system reliability and robustness to parameter changes.
Analysis of Influencing Factors on Viscosity of Agar Solution for Capsules
Authors: Yu Zhenhua , Zhan Jianbo , Wang Hao , Zheng Han , Xie Jiao , Wang Xu 
Published: November 2020

Abstract
The viscosity of agar solution for capsules depends on the molecular structure and chemical composition of agar. In addition, many external factors also affect its viscosity, such as concentration, temperature, metal ions, electrolyte and non electrolyte, mechanical stirring shear. In this paper, the factors that affect the viscosity of the liquid, which mainly include concentration, temperature and pH, are studied. The results showed that the order of the influence on the viscosity of agar solution was agar concentration > water hardness > solution temperature > pH. Within the range of this experiment, agar concentration, water hardness and solution temperature have significant effects on the viscosity of agar solution, while the pH of solution has no significant effect on the viscosity.
Nonlinear predictive control of horizontal vibration of high speed elevator
Authors: Wang Hong , Zhang Mingqin , Zhang Ruijun , Zhang Luzhong 
Published: November 2020

Abstract
This Aiming at the problem of horizontal vibration of high-speed elevators caused by the guide rail excitation, firstly, considering the nonlinear characteristics of the spring rigidity and damping of the guide shoe system, a four-degree-of-freedom high-speed elevator nonlinear horizontal vibration model is established. Secondly, the state equation of horizontal vibration of high-speed elevator is derived, and the system state is processed by Taylor expansion. The quadratic performance index of predictive control is introduced, and the active control law with analytic form is solved by optimizing the performance index. Finally, the simulation using MATLAB verifies the correctness of the model. By further solving the control law and simulation, the results prove that predictive control can effectively reduce the horizontal vibration of high-speed elevators.
A preconditioned conjugate projected gradient method for computing eigenvector derivatives with repeated eigenvalues
Authors: Xia Xiao , Fan Qinyin , Yang Shitong 
Published: November 2020

Abstract
A preconditioned conjugate projected gradient (PCPG) method is given to solve the repeated eigenvector derivatives with respect to design parameters in finite element models. The factored stiffness matrix is used as a preconditioner, the new method can provide the approximate solutions to repeated eigenvector derivatives. This method can be used as an eigenvector sensitivities solver which can be coupled as an eigensolver/derivative software. Moreover, the new method can be used for industrial-size models. Finally, a numerical example is provided to illustrate the superior efficiency of the present method.