bluuebunny/crossref_metadata_2025_split huggingface dataset:
Learning Media Based on Three Level Representation and Inquiry for Electrolysis Cell Materials
Authors: Farida Ida , Mayangsari Dian , Irwansyah F S 
Published: August 2020

Abstract
Research has been conducted aimed at designing three-level representation-based learning media in electrolytic cell material. The research product in the form of a model kit equipped with inquiry-based worksheets was developed through the stages of design based research. The model kits and worksheets produced have the characteristics: integrating macroscopic, submicroscopic and symbolic levels of representation, developing the ability of chemical representation and scientific performance. The submicroscopic and symbolic representations are explored using particle models made of magnetism to simulate the transfer of ions and electrons during an electrolysis reaction. Validation and testing of products and inquiry-based worksheets show the product is valid and feasible to use.
Profile of Students’ Science Process Skills in Acid Base Titration Practicum at Class XI MIPA 3 SMA Negeri 1 Singaraja Bali
Authors: Adiningsih M D , Karyasa I W , Muderawan I W 
Published: August 2020

Abstract
The research was aimed to describe the profile of students’ science process skills and the factors that influence science process skills of class XI MIPA 3 SMA Negeri 1 Singaraja in the implementation of acid base titration practicum. This research conducted by using a phenomenological qualitative approach. The methods that used to collect data were observation, interviews, and documentation. Data were analyzed by qualitative descriptive techniques. The result that obtained is profile of students’ science process skills at class XI MIPA 3 SMA N 1 Singaraja which is limited to mastery of science process skills. Science process skills that have been mastered by students consist of 7 aspects of skills, namely skill to measure the volume of the solution with volumetric pipette and burette included in the good category with the number of students 100%; the skill to use universal indicator, communication skills, and applying concepts included in the excellent category with the number of students 100%; observing skill, titration skill, and interpreting skill included in the excellent category with the number of students 60%; and predicting skill included in the excellent category with the number of students 80%. Skill that is less mastered by students was concluding skills based on the results that 60% students included in the poor category. Science process skills that are not trained for students consist of 4 skills, namely the skills of formulating hypotheses, controlling variables, designing investigations, and classifying. The factors that influence students’ science process skills in the implementation of acid base titration practicum are classified into four factors, namely tools, materials, humans, and methods/technical.
The effect of feed supplement on growth, survival rate and immunity response of Pacific white shrimp Litopenaeus vannamei
Authors: Haryanti  , Permana I G N , Fahrudin  , Budi Moria Sari , Muzaki Ahmad , Sugama K. 
Published: August 2020

Abstract
An efforts to improve growth, survival and immunity response are still main issues in shrimp farming. The purpose of this study was to determine the effect of dietary supplements on the growth, survival and immunity response in order to increase phenotypic performance of Litopenaeus vannamei. The experiments were done by supplemented feed using i.e.,(A) Synthetic nucleotides (0.03 % of feed), (B) whole cell of Saccharomyces cerevisiae (100 mL/kg feed) and (C) Control (without feed supplement) and fed to the shrimp, Litopenaeus vannamei. The supplements were mixed in feed formulated and coated with chitosan, while the control without feed supplement. The shrimp larvae were reared in 5 m3 tanks with two replications The result showed that survival rate of shrimp that reared with supplemented synthetic nucleotide was 69,29% and with whole cell was 75,45% and control was 67,61%. Total haemocyte of shrimp before challenge test ranged from 287.2 to 465.7 x 104 cells/mL , but after challenge test with WSSV, have shown different number of cell densities where in the treatments of synthetic nucleotide was 303.63 x104cell/mL, whereas in whole cell and control were 265 x 104 cell / mL and 254,25 x 104 cell / mL respectively. Immunity response of L. vannamei shrimp expressed from ProPO was significantly different between supplemented feed compared to control after challenged with WSSV, TSV and IMNV.
Integrative Health Thematic Strategy Increases Learning Outcomes And Students ‘Clean And Healthy Living Behaviors
Authors: Ketut Sudiana I , Adiputra N , Budi Adnyana Putu 
Published: August 2020

Abstract
This study aimed to improve student learning outcomes, clean and healthy living behaviors (PHBS). This goal achieved through an integrative health thematic strategy (STIK). This study was a quasi-experiment with randomized pretest-posttest control group design. It conducted in 2016/2017 academic year in Buleleng sub-district. It used two sample classes who took by multistage random sampling technique. One class as a Control Group was taught with Conventional Strategy (SK) using the 2013 Curriculum Integrated Thematic Book, and one class as a Treatment Group was taught with STIK using an integrative health thematic textbook (BATIK). Data were analyzed using MANOVA at a significance level of 5%. Based on the results of the data analysis it is evident that STIK improves the learning outcomes of thematic knowledge 16.6 percent, PHBS knowledge 71.7 percent, PHBS attitudes 70.5 percent, and practice PHBS 10.8 percent. The conclusion of this study is the integration of health education into the themes of learning to improve student learning outcomes and PHBS. The implication of the results of this study is that STIK can be recommended as an alternative learning strategy that has the advantage of improving learning outcomes and providing health education to students.
Randomness in appendage coordination facilitates strenuous ground self-righting
Authors: Xuan Qihan , Li Chen 
Published: August 2020

Abstract
Randomness is common in biological and artificial systems, resulting either from stochasticity of the environment or noise in organisms or devices themselves. In locomotor control, randomness is typically considered a nuisance. For example, during dynamic walking, randomness in stochastic terrain leads to metastable dynamics, which must be mitigated to stabilize the system around limit cycles. Here, we studied whether randomness in motion is beneficial for strenuous locomotor tasks. Our study used robotic simulation modeling of strenuous, leg-assisted, winged ground self-righting observed in cockroaches, in which unusually large randomness in wing and leg motions is present. We developed a simplified simulation robot capable of generating similar self-righting behavior and varied the randomness level in wing–leg coordination. During each wing opening attempt, the more randomness added to the time delay between wing opening and leg swinging, the more likely it was for the naive robot (which did not know what coordination is best) to self-right within a finite time. Wing–leg coordination, measured by the phase between wing and leg oscillations, had a crucial impact on self-righting outcome. Without randomness, periodic wing and leg oscillations often limited the system to visit a few bad phases, leading to failure to escape from the metastable state. With randomness, the system explored phases thoroughly and had a better chance of encountering good phases to self-right. Our study complements previous work by demonstrating that randomness helps destabilize locomotor systems from being trapped in undesired metastable states, a situation common in strenuous locomotion.
Driverless simulation of path tracking based on PID control
Authors: Wang Zhaojian , Wang Mengen , Zhang Yaoming , Guan Tian , Song Xiaoli , Liu Jiawei , Zhen Yajing , Zhang Dongsheng 
Published: August 2020

Abstract
In order to realize the path tracking of autonomous vehicles, this paper first simplifies the complex structure of the vehicle into a two-degree-of-freedom kinematic and dynamic vehicle model. based on PID control, the vehicle path tracking controller is designed to calculate the lateral deviation between the expected path and the actual path, and outputs the front wheel rotation angle through the controller, so that the autonomous vehicle can travel well according to the expected path. The control system model is built in the MATLAB/Simulink, and the vehicle path tracking control system is simulated and verified jointly with the CarSim software platform. Simulation results show that the designed control strategy can ensure the path tracking performance of intelligent vehicles at different speeds, and has good tracking accuracy, real-time performance and vehicle driving stability.
Enhancement of power generation of thermoelectric generator using phase change material
Authors: Mao Jianhui , Liu Anbang , Wang Yuanyuan , Li Yihuai , Xie Huaqing , Wu Zihua 
Published: August 2020

Abstract
This paper demonstrates a thermoelectric generator (TEG) that embeds phase change material (PCM) for waste heat energy harvesting. In this TEG module, a volume of molten carbonate salt is encapsulated in a cuboid polydimethylsiloxane (PDMS) body. In order to study the effect of embedded PCM on the TEG performance, we compared the performance of TEGs with and without PCM. The results show that a higher output voltage and a longer energy harvesting time can be reached in TEG with PCM in compared with the corresponding values in the TEG without PCM once the heat source stops supplying heat. Especially, the relative increase of the total electricity by adopting the PCM is as large as 25%. Our work proposes an effective and feasible way to enhance the performance of the TEG system by application of the PCM.
Active control simulation based on an active vibration isolator
Authors: Wang Yunfeng , Du Yikang , Zhanxin  
Published: August 2020

Abstract
We studied an active vibration isolator’s performance for vibration suppression in this article. A modified FxLMS control method is presented by replacing the weights update law of FxLMS with NR-LMS algorithm and its reference signals is got from the sensors’ output. Control simulation is performed by employing the models identified and the modified FxLMS method, the results indicate that the modified FxLMS method can suppress the vibration effectively and the control performance can be improved by minimizing the divergence between the secondary plant model and the practical second plant.
Fluid dynamic simulation of single cell sorting by fiber laser in microfluidics
Authors: Zhong Xiaoxiang , Mao Weixing , Zhang Huali 
Published: August 2020

Abstract
Optofluidic devices have immense potential for single cell manipulation, including trapping, sorting, counting and stretching. Commercially available devices remain costly and technical. Embedded optical fibers within the microfluidic device simplify the construction and supply stable, sensitive, high throughput scattering measurements for particles and cells. We present numerical simulations on flow field in micro channels embedded with an optical fiber, which are able to provide optical sorting and controlled movement of single particles. We simulate the displacement and deflection of micro particles by single laser with different optical forces. We believe that this simulation method can be used to emulate the process of optical trapping and sorting for cells at constriction channels of different cross-sectional areas.
Applicability analysis of STM and SMCFT of RC beams with shear span-depth ratios ≤ 3.0
Authors: Yang Pengfei , Yang Xu , Liang Guanxi , Li Weiwen , Zheng Jing , Guo Sen 
Published: August 2020

Abstract
The shear capacity of reinforced concrete (RC) beams is significantly affected by the shear span-depth ratio (av/d). The strut-and-tie model (STM) and simplified modified compression field theory (simplified MCFT) that are utilized in current design codes have both proven to be effective in the shear capacity analysis and the design of RC beams. In order to compare the validity and applicability of the two approaches within the range of av/d ≤ 3.0, 160 RC beams with transverse reinforcements were collected and their shear capacities were evaluated using the two models respectively. The results demonstrated that the ratio of av/d = 1.8 was be the critical point that separated the ranges in which each approach was better able to predict the shear capacity. More specifically, it could be concluded that using the STM approach in the range av/d ≤ 1.8 and the simplified MCFT approach in the range 1.8 < av/d ≤ 3.0 respectively would result in more rational and accurate shear strength predictions.
Clearance optimization of radial bearings for multi-bearing shafting system
Authors: Liu Yue , Mao Ming , Tian Zhen , Zhang Xin 
Published: August 2020

Abstract
There will be a huge difference of fatigue life among the bearings mounted on the shaft for multi-bearing shafting system without designing operating clearance. A unique method for multi-shafting system is presented to optimize operating clearance through selecting proper internal clearance class and designing tolerance of fitting shaft on the basis of thermal conditions and system deflection. An example illustrates that the minimum value of fatigue life calculated by ISO/TR 16281 among radial bearings for multi-bearing shafting system has improved 4.2 times greater than original design through the method mentioned in this paper. It is proved that this method has great advantages on accuracy and convergence, significantly improving the minimum fatigue life among bearings of multi-bearing shafting system.
Research and application of efficient milling process for surface casing
Authors: Zhang Xu , Wang Jianning , Ma Changqing , Li Zhansheng , Han Mingzhe , Li Man , Yuan Jingqiang , Liu Yunti 
Published: August 2020

Abstract
In order to solve the problems in the surface casing removal, the casing milling process is proposed to be used. Through the size and material selection of casing milling pipe, mechanical analysis of connection thread and the innovative design of casing milling shoes, a series of casing milling tools and the efficient casing milling process are formed. The field application results show that the milling process can smoothly mill to the predetermined position. After the milling process, the surface casings can be successfully removed by cutting and fishing. The efficient milling process studied in this paper can make the removal of the surface casing with low cast and high efficiency. Both social and economic benefits are remarkable and it has a broad application prospect.
Research on compressor blades fatigue life test under thermal-vibration combined load
Authors: Yao Zemin , Huang Shouqing , Huang Xiaokai , Wu Ruliang , Liu Shouwen 
Published: August 2020

Abstract
Contrapose the fatigue life of compressor blades under thermal-vibration combined load, this article is described to carry out the fatigue life test of blades under the thermal-vibration load, the test device is designed in this article, the test conditions are determined, and the test results are analysed to obtain the conclusion that resonant frequency decreases gradually as fatigue life time goes on, and the extent of blades damage could be quantitatively described by calculating the drift distance of resonant frequency. It can also provide data support for life prediction.
Research on windage yaw characteristics of high-voltage insulators in complex wind field
Authors: Li Jun , Mao Dong , Zhu Quan , Gao Qiang 
Published: August 2020

Abstract
In this paper, in order to fully consider the influence of complex wind field on the windage yaw angle of insulator string, the WRF-Fluent multi-scale calculation model is developed to simulate a windage yaw accident caused by a typhoon transit process in the Ouhai Distrct of Zhejiang, China, the dynamic response of the faulty insulator string in the wind field is analysed through two-way fluid-structure interaction calculation, and the windage yaw condition of the insulator is obtained by transient dynamics simulation. The theoretical windage yaw angle under complex wind field is also calculated according to the design standard. This paper shows that the complex wind field has an nonnegligible influence on windage yaw angle of insulator string, so it is necessary to fully consider the influence of complex wind field on high-voltage insulators in future design standard.
Research on analysis method of dynamic friction torque of high speed precision miniature bearings
Authors: Zheng Zhiqiang , Li Songsheng , Liu Yangyang , He Guoqing , Yang Huanzhao , Yang Tongxu 
Published: August 2020

Abstract
High-speed precision miniature bearings are used in the gyro spindle of precision inertial navigators in the aerospace industry. The dynamic friction torque of the bearings is difficult to be accurately analyzed and calculated using existing methods because it is small and has many influencing factors.The special testing machine for dynamic friction torque testing of high-speed miniature bearings is be used to test the dynamic friction torque of specific high-speed precision miniature bearings under various operating conditions. It is related to the speed, axial preload, and radial external load. The test data of bearing dynamic friction torque was obtained. On this basis, the least squares method of regression analysis theory is used to fit polynomial fitting of the dynamic friction torque of the tested bearing and the corresponding working condition parameters, and the regression equation for analyzing the dynamic friction torque of the tested bearing is obtained. The test results show that under different test conditions, the measured values of the bearing’s dynamic friction torque are in good agreement with the calculated values using the regression equation. The obtained regression equation can be used to analyze the dynamic friction torque characteristics of the same bearing under other operating conditions. A reliable and effective method was proposed for quickly and easily obtaining accurate high-speed precision miniature bearing dynamic friction torque.
Experiments on the flow characteristics of hydraulic orifices under high or low temperature conditions
Authors: Wang Wenlin , Zhou Zirong , Kong Xin , Wu Yongming 
Published: August 2020

Abstract
A new test rig with a compact experimental module has been developed in this study to support experiments on fluid mechanics of hydraulic orifices under high or low temperature conditions, by using the test rig, experiments on flow characteristics of a sharp-edged orifice and a thick-wall orifice were conducted in a temperature range of -10°C∼+80°C. Experimental results show that in a wide temperature range, the Flow-Pressure characteristics of the sharp-edged orifice are not sensitive to temperature changes, but that of the thick-wall orifice will vary obviously at different temperatures; In the temperature range up to 20°C, the Discharge coefficients and Damping forces of both of the two orifices remain at constants, however, when the fluid temperature is below 20°C, Discharge coefficients of the two orifice will drop linearly, damping forces of the two orifice will increase, but discharge coefficient and damping force of the thick-wall orifice will respectively drop and increase more sharply than that of the sharp-edged orifice, so this indicates that at low temperature conditions the fluid resistance and energy loss when it passes through a thick-wall orifice are larger than that when it passes through a sharp-edged orifice.
Polyvinyl alcohol templated synthese of hierarchical SAPO-11
Authors: Zhao Wenjing , Yang Hongxia , Li Zhihui , Zhang Longli , Lin Xufeng , Fu Hui , Liu Zhen , Wang Chuangye 
Published: August 2020

Abstract
This work reports that the polyvinyl alcohol successfully templates the intracrystal mesoporous structure of hierarchical SAPO-11 molecular sieves. The structures of prepared hierarchical SAPO-11 materials and a conventional SAPO-11 simultaneously synthesized are characterized by X-ray diffraction, N2 adsorption/desorption, scanning electron microscopy and high resolution transmission electron microscopy. The characterizations demonstrate that this synthesized hierarchical SAPO-11 possesses a mesopore structure with a much regular pore size distribution. Importantly, these mesopores are intracrystal but not intercrystal. The bifuntional isomerization catalyst with this hierarchical SAPO-11 as support shows a high selectivity in hydroisomerization reaction of hexane, evidencing that the catalytic selectivity is improved by introduction of mesopore structure into the SAPO-11 crystal. The templating mechanism of polyvinyl alcohol in formation of mesopores is well discussed at the ending. This work provides a potential template to prepare hierarchical catalyst materials.
Electrical characteristics analysis of a 314 mm2 double-sided spiral SDD for x-ray pulsar navigation
Authors: Zhang Xinwang , Li Zheng , Liu Manwen , Mu Hengheng 
Published: August 2020

Abstract
Pulsar navigation, to meet the physical needs of detecting pulsed x-ray contour, requires a large-area and high-energy resolution silicon drift detector (SDD). Until recently when we designed and fabricated a 314 mm2 double-sided spiral SDD, SDDs developed worldwide have been relatively small in size with a typical diameter less than 10 mm. The details of the design of our 314 mm2 double-sided spiral SDD had been reported in the literature (Li (2013) Nuclear Instruments and Methods in Physics Research A 730 73–78). Present work involves the analysis of electrical characteristics simulations of a 314 mm2 double-sided spiral SDD. It is essential to study the carriers drift behavior of a 314 mm2 double-sided spiral SDD for the structural design optimization of the detector. Therefore, this paper analyzes the relevant electrical characteristics that can characterize the carriers drift behavior. Firstly, this paper illustrates the electric potential, electric field, and electron concentration of the detector. Then, it also provides an analysis of the transient current by simulated the single event transient (SET) effect. The SILVACO TCAD simulator was used to simulate these electrical characteristics. Based on TCAD simulation, the best drift electric field and optimal electron drift channel in a 314 mm2 double-sided spiral SDD are demonstrated. Moreover, the transient current and charge collection mechanism of the detector is also analyzed. Finally, we also tested the leakage current and capacitance of the detector at room temperature.