scholarly journals Development of a Bionic Dolphin Flexible Tail Experimental Device Driven by a Steering Gear

Actuators ◽  
2021 ◽  
Vol 10 (7) ◽  
pp. 167
Author(s):  
Bo Zhang ◽  
Qingxiang Li ◽  
Tao Wang ◽  
Zhuo Wang
Keyword(s):  
Dynamic Modeling ◽  
Body Wave ◽  
Experimental Device ◽  
Flexible Tail ◽  
The Real ◽  
Gear Drive ◽  
The Common ◽  
Better Than

In order to study the mechanism of the tail swing of the bionic dolphin, a flexible tail experimental device based on a steering engine was developed. This study was focused on the common three joint steering gear and its use in a bionic dolphin tail swing mechanism, and it was found that the bionic dolphin driven by the steering gear had the problem of excessive stiffness. In order to solve this problem, we designed a bionic dolphin tail swing mechanism. The tail swing mechanism was designed rationally through the combination of a steering gear drive and two flexible spines. Analysis of kinematic and dynamic modeling was further completed. Through simulation using, the research on the bionic dolphin tail swing mechanism was verified. Experiments showed that the swing curve formed by the steering gear-driven bionic dolphin tail swing mechanism with two flexible spines fit the real fish body wave curve better than the original bionic dolphin tail swing mechanism.

Scanning Secondary Electron Microscopy of Myofibrils Using Transmission Techniques

1975 ◽  
Vol 33 ◽  
pp. 556-557
Author(s):  
M. K. Lamvik
Keyword(s):  
Electron Microscopy ◽  
Electron Microscope ◽  
Carbon Films ◽  
Photographic Recording ◽  
Transmission Electron ◽  
Thin Carbon ◽  
The Common ◽  
Scanning Electron ◽  
Better Than ◽  
Cellular Organelles

When observing small objects such as cellular organelles by scanning electron microscopy, it is often valuable to use the techniques of transmission electron microscopy. The common practice of mounting and coating for SEM may not always be necessary. These possibilities are illustrated using vertebrate skeletal muscle myofibrils.Micrographs for this study were made using a Hitachi HFS-2 scanning electron microscope, with photographic recording usually done at 60 seconds per frame. The instrument was operated at 25 kV, with a specimen chamber vacuum usually better than 10-7 torr. Myofibrils were obtained from rabbit back muscle using the method of Zak et al. To show the component filaments of this contractile organelle, the myofibrils were partially disrupted by agitation in a relaxing medium. A brief centrifugation was done to clear the solution of most of the undisrupted myofibrils before a drop was placed on the grid. Standard 3 mm transmission electron microscope grids covered with thin carbon films were used in this study.

Evaluation of Gas-Liquid Chromatography in Assays for Blood Volatiles

1965 ◽  
Vol 11 (11) ◽  
pp. 1023-1035 ◽  
Author(s):  
Alan Mather ◽  
Angel Assimos
Keyword(s):  
Liquid Chromatography ◽  
Alcohol Concentration ◽  
Quantitative Assay ◽  
Gas Liquid Chromatography ◽  
Internal Reference ◽  
Detection And Identification ◽  
Large Populations ◽  
The Common ◽  
Low Levels ◽  
Better Than

Abstract A simple screening by gas-liquid chromatography (GLC) can provide definitive answers in the detection and identification of a number of volatile substances, including acetone and the common alcohols. After identification, quantitative assay by an internal-reference technic yields highly specific values for ethyl alcohol concentration with a precision at least equal to (and for low levels, better than) that of conventional assays. The unique advantage of GLC is in its simultaneous quantitative assay of mixtures, some of which cannot be satisfactorily assayed or even recognized in any other way. The combination of speed and negligible sample volumes render the technic valuable for sequential studies on capillary blood samples and, potentially, for mass screening of large populations.

scholarly journals A Real-Time Structure of Attitude Algorithm for High Dynamic Bodies

2017 ◽  
Vol 2017 ◽  
pp. 1-8
Author(s):  
Xingcheng Li ◽  
Shuangbiao Zhang
Keyword(s):  
Real Time ◽  
Time Structure ◽  
Flow Diagram ◽  
The Real ◽  
Time Problem ◽  
Conventional Structure ◽  
High Dynamic ◽  
Two Stages ◽  
Better Than ◽  
Attitude Matrix

To solve the real-time problem of attitude algorithm for high dynamic bodies, a real-time structure of attitude algorithm is developed by analyzing the conventional structure that has two stages, and a flow diagram of a real-time structure for a Matlab program is provided in detail. During the update of the attitude matrix, the real-time structure saves every element of attitude matrix in minor loop in real time and updates the next attitude matrix based on the previous matrix every subsample time. Thus, the real-time structure avoids lowering updating frequency, though the multisubsample algorithms are used. Simulation and analysis show that the real-time structure of attitude algorithm is better than the conventional structure due to short update time of attitude matrix and small drifting error, and it is more appropriate for high dynamic bodies.

Improved Tercom Based on Fading Factor

2011 ◽  
Vol 143-144 ◽  
pp. 770-774 ◽  
Author(s):  
Shou Lei Lu ◽  
Long Zhao ◽  
Chang Yun Zhang
Keyword(s):  
Correlation Function ◽  
Real Data ◽  
Angle Error ◽  
The Real ◽  
Velocity Error ◽  
Speed Error ◽  
Fading Factor ◽  
Yaw Angle ◽  
Better Than

In order to solve the problem of the traditional Tercom, which is sensitive to the speed error and yaw angle error, an improved Tercom approach using with fading factor is introduced. The basic idea of this approach is to estimate the navigation position by a novel correlation function. The correlation function is calculated by weighted historical measurements. Experiment results with the real data show that this approach performs better than the traditional Tercom with regard to overcoming velocity error and yaw angle error.

scholarly journals Impact of Unusual Features in Credit Scoring Problem

2020 ◽  
Author(s):  
Luiz Felipe Vercosa ◽  
Rodrigo Lira ◽  
Rodrigo Monteiro ◽  
Kleber Silva ◽  
Jailson Magalhaes ◽  
...  
Keyword(s):  
Multilayer Perceptron ◽  
Demographic Data ◽  
Credit Scoring ◽  
Financial Data ◽  
Unusual Feature ◽  
The Real ◽  
Kolmogorov Smirnov ◽  
Small Improvement ◽  
Better Than

Standard features used for Credit Scoring includes mainly registration and financial data from customers. However, exploring new features is of great interest for financial companies, since slight improvements in the person score directly impact the company revenue. In this work, we categorize features from open credit scoring datasets and compare them with the features found in a real company dataset. The company dataset contains unusual feature groups such as historical, geolocation, web behavior, and demographic data. We performed bivariate tests using the Kolmogorov-Smirnov metric and features to assess the performance of the particular feature groups. We also generated a score of good payer by using AdaBoost, Multilayer Perceptron, and XGBoost algorithms. Then, we analyzed the results with different metrics and compared them with the real company results. Our main finding was that these features added a small improvement to current datasets. We also identified the most promising feature groups and noticed that the tuned XGBoost performed better than the company solution in three out of four deployed metrics.

scholarly journals Penerapan Strategi Pembelajaran Circuit Learning: Suatu Upaya dalam Meningkatkan Hasil Belajar Siswa

2019 ◽  
Vol 9 (2) ◽  
pp. 285
Author(s):  
Syahrial Syahrial
Keyword(s):  
Learning Outcomes ◽  
Learning Strategy ◽  
Alternative Hypothesis ◽  
Mathematics Learning ◽  
Control Group ◽  
Test Analysis ◽  
The Real ◽  
Randomized Control ◽  
Affective Domains ◽  
Better Than

This research is motivated by the low student mathematics learning outcomes. The influencing factors are inactive students and lack of communication between students and students. This study aims to determine the effect of the application of the circuit learning strategy to students' learning outcomes in the cognitive and effective domains. This type of research is pre-experimental and the research design used is randomized control group only design. Based on the final test of learning outcomes obtained an average of mathematics learning outcomes in the experimental class 79.3 and the average mathematics learning outcomes of the control class 70. The results of the t-test analysis obtained tcount = 3.89 and ttable = 1.667 at the real level of 0.05. It is concluded that tcount> ttable accepts an alternative hypothesis (H1) that is the mathematics learning outcomes of the experimental class students is better than the control class. Analysis of the data in the affective domain obtained zcount = 3.83 and ztable = 1.64 at the real level of 0.05 thus zcount> ztable, in other words Hi is accepted meaning that student learning activities in the experimental class are better than the control class. Based on data analysis in the cognitive and affective domains it can be concluded that there is an influence of the application of the circuit learning strategy to student mathematics learning outcomes.

The Costs of Transitivity: Thoughts on Larry Temkin’s Rethinking the Good

2015 ◽  
Vol 12 (4) ◽  
pp. 462-478 ◽  
Author(s):  
Shelly Kagan
Keyword(s):  
Common Belief ◽  
Value Judgments ◽  
The Common ◽  
Better Than

In Rethinking the Good, Larry Temkin argues that the common belief in the transitivity of better than (all things considered) is incompatible with various other value judgments to which many of us are deeply committed; accordingly, we should take seriously the possibility that the better than relation is not, in fact, a transitive one. However, although Temkin is right, I think, about the mutual incompatibility of the beliefs in question, for the most part his examples don’t leave me inclined to deny transitivity. Nonetheless, there is one example, involving infinity, that does seem to me particularly troubling.

scholarly journals Reflections in classical philosophy concerning the superiority of spiritual power vs. physical vigor, by Xenophanes: Frag. 2D = 2W

2020 ◽  
pp. 8
Author(s):  
Konstantina I. Gongaki ◽  
Yannis S. Georgiou ◽  
Lilly Sofia Schmidt Gongaki
Keyword(s):  
Common Good ◽  
Spiritual Life ◽  
Ethical Values ◽  
Spiritual Values ◽  
Spiritual Power ◽  
The Real ◽  
Classical Philosophy ◽  
The Common ◽  
The One ◽  
The City

Xenophanes of Colophon (570-475 BC), a Pre-Socratic philosopher of the Eleatic School, faced life with his outspoken spirit, criticizing any values of his time considered obsolete, such as the anthropomorphic representation of the gods. He was the first philosopher who challenged the sporting value to the spiritual one. Revolutionary and innovative, in his second elegy expresses his preference for spiritual power, and he stands ironical towards the Greeks who give the physical rhyme excessive importance. According to Xenophanes, the athletic victory is simply due to the speed of the feet and does not affect the spiritual life of the city, while, on the contrary, the one who affects the ethical values of society is the one who produces thoughts and is interested in the common good. Obviously, Xenophanes feels unjust, and reacts to the great mismatch that exists between the real athletes' offer and the great honors that the society ascribes to them. Characteristically, Euripides will be influenced by Xenophanes’ ideas, while Isokrates, as well as other wise and intellectuals of the Classical Ages, will highlight the superiority of spiritual values as compared to athletic offerings, arguing that the greatest spiritual value is wisdom and the resulting benefit.

Personality

2016 ◽  
pp. 98-101
Author(s):  
Jonathan Leicester
Keyword(s):  
Personality Traits ◽  
Direct Effect ◽  
Need For Closure ◽  
Common Assumption ◽  
The Real ◽  
Occupational Roles ◽  
The Common ◽  
The Way

The chapter opens by questioning the role of personality traits in causing behaviour, and decides to work with the common assumption that they have an important role. There is an account of the search for the real units or traits of personality. Some of the traits and dispositions, selected for their particularly direct effect on belief, for example, strong need for closure, are briefly described. There is a comment on the way long-standing occupational roles can sometimes modify personality.

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