scholarly journals Obstacle Capability of an Air-Ground Amphibious Reconnaissance Robot with a Planetary Wheel-Leg Type Structure

2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
Enzhong Zhang ◽  
Ruiyang Sun ◽  
Zaixiang Pang ◽  
Shuai Liu

According to the requirements of the reconnaissance robot for the ability to adapt to a complex environment and the in-depth study of the obstacle climbing mechanisms, a planetary wheel-leg-combined mechanism capable of adapting to complex terrains is proposed. According to the proposed planetary wheel-leg-combined mechanism, the land part of the air-ground amphibious reconnaissance robot is designed. Considering the obstacle and fast marching performance, four groups of combined wheel-leg mechanisms are adopted in the land bank. Under the action of three kinds of obstacles, the stability and the movement ability of the robot are analyzed by using the static method. The parameter model of the reconnaissance robot is built by a virtual prototype dynamics software MSC.ADMAS. The kinematic characteristic curves of each component and the whole prototype are obtained, which provides a theoretical basis for the design and numerical calculation of the robot structure. Finally, the climbing ability tests of the reconnaissance robot prototype verify the reliability and practicability of the body structure of the reconnaissance robot.

Vestnik ◽  
2021 ◽  
pp. 16-23
Author(s):  
К.Ж. Рыскелдиева ◽  
С.А. Туктибаева

Будущее любой нации определяется, прежде всего, здоровьем подростков, их репродуктивными способностями. Состояние репродуктивного здоровья подростков в настоящее время является предметом обсуждения не только среди специалистов, но и в обществе. Это говорит об особой остроте и актуальности проблемы. Пубертатный период, как период формирования полового созревания организма, занимает важное место в формировании женской репродуктивной системы, функционирование которой во многом зависит от совместимости и развития девочки в период полового созревания. Особенности пубертатного периода влияют на состояние репродуктивного здоровья женщины в течение всей ее жизни, ее фертильность, а также на демографическую ситуацию в стране [1,2]. Статистические данные за последнее десятилетие показывают, что наряду с ярко выраженными неблагоприятными тенденциями в здоровье всего населения наблюдаются значительные изменения среди девочек-подростков. По мнению исследователей, устойчивость негативной динамики среди подростков сохраняется, так как во многом это связано с неблагоприятными экологическими условиями, несбалансированными физическими нагрузками, различными факторами, такими как хронический стресс и неграмотность населения в отношении собственного здоровья. Кроме того, большое значение имеет и экономическая ситуация. В связи с этим проведенный литературный обзор направлен на углубленное изучение проблемы. The future of any nation is determined, first of all, by the health of adolescents, their reproductive abilities. The state of adolescent reproductive health is currently the subject of discussion not only among specialists, but also in society. This indicates the special acuteness and urgency of the problem. Puberty, as the period of formation of puberty of the body, occupies an important place in the formation of the female reproductive system, the functioning of which largely depends on the compatibility and development of the girl during puberty. The peculiarities of the puberty period affect the state of a woman's reproductive health throughout her life, her fertility, as well as the demographic situation in the country [1,2]. Statistics over the past decade show that, along with pronounced adverse trends in the health of the entire population, there are significant changes among adolescent girls. According to the researchers, the stability of the negative dynamics among adolescents remains, as this is largely due to unfavorable environmental conditions, unbalanced physical activity, various factors such as chronic stress and illiteracy of the population in relation to their own health. In addition, the economic situation is also of great importance. In this regard, the literature review is aimed at an in-depth study of the problem.


Author(s):  
Natalia Prodiana Setiawati ◽  
Joko Santoso ◽  
Sri Purwaningsih

The utilization of local food commodities such as corn and cassava with seaweed addition as a dietary fiber source for producing artificial rice through extrusion technology is an  alternative for food diversification. The research was carried out to find out the best composition (rice, corn, cassava, and seaweed) and temperature of extrusion process on making artificial rice and the influence of dietary fibre on sensory properties and physicochemical. The composition of rice, corn, and cassava in proportion  of 1:3:1 with 20% seaweed, Eucheuma cottonii, addition and temperature extruder of 90 °C were selected as the best product for artificial rice. The  sensory evaluation was 8.02±0.21 (people’s preference). In physicochemical properties, dietary fiber significantly affected on low bulk density and starch digestibility. This condition is very good for health especially in maintaining the stability of blood glucose in the body. Keywords: artificial rice, composition, extrusion, seaweed, dietary fibre, temperature


Author(s):  
Fesenko, H.

Purpose. Increasing the uniformity of distribution of mineral fertilizers and other bulk materials due to the stability of their feed from the body to the spreading working bodies using the top feeder. Methods. The following methods are used to achieve this aim: the method of comparing the differences between individual groups of fertilizers, the method of analyzing the properties of a new technical system, the method of functional inventiveness, and the methods of theoretical and analytical mechanics. Results. The traction body of the conveyor of the upper feed of the body fat body machine for mineral fertilizers and other bulk materials was substantiated and the relationship between the height of its scrapers and the distance between them was established, as well as the nature of the mineral fertilizer pressure on the curvilinear wall of the body. In addition, the design of the advanced body fertilizer spreader is justified, which ensures a stable flow of fertilizers from the body due to the improvement of the top feeder. Conclusions. Because of the conducted researches, the advantages of machines equipped with top feeder are found. They create the conditions for the forced feeding mineral fertilizers and other loose materials from the container to the distribution bodies, which is a prerequisite for their evenness on the surface. With this, the imperfection of known machines with the top feeder constrains their introduction into agricultural production. On this account, a more thoroughly constructed solution of the body feeder of the top feed is substantiated, in which the conveyor provides a stable supply of fertilizers from the body with reduced energy consumption during operation. Keywords: analysis, feed, upper device, conveyor, stability, fertilizers, flow ability, body.


2020 ◽  
Vol 14 (2) ◽  
pp. 108-125
Author(s):  
Apoorva Singh ◽  
Nimisha

: Skin cancer, among the various kinds of cancers, is a type that emerges from skin due to the growth of abnormal cells. These cells are capable of spreading and invading the other parts of the body. The occurrence of non-melanoma and melanoma, which are the major types of skin cancers, has increased over the past decades. Exposure to ultraviolet radiations (UV) is the main associative cause of skin cancer. UV exposure can inactivate tumor suppressor genes while activating various oncogenes. The conventional techniques like surgical removal, chemotherapy and radiation therapy lack the potential for targeting cancer cells and harm the normal cells. However, the novel therapeutics show promising improvements in the effectiveness of treatment, survival rates and better quality of life for patients. Different methodologies are involved in the skin cancer therapeutics for delivering the active ingredients to the target sites. Nano carriers are very efficient as they have the ability to improve the stability of drugs and further enhance their penetration into the tumor cells. The recent developments and research in nanotechnology have entitled several targeting and therapeutic agents to be incorporated into nanoparticles for an enhancive treatment of skin cancer. To protect the research works in the field of nanolipoidal systems various patents have been introduced. Some of the patents acknowledge responsive liposomes for specific targeting, nanocarriers for the delivery or co-delivery of chemotherapeutics, nucleic acids as well as photosensitizers. Further recent patents on the novel delivery systems have also been included here.


2021 ◽  
Vol 2 (1) ◽  
pp. 63-81
Author(s):  
Sajana Manandhar ◽  
Erica Sjöholm ◽  
Johan Bobacka ◽  
Jessica M. Rosenholm ◽  
Kuldeep K. Bansal

Since the last decade, the polymer-drug conjugate (PDC) approach has emerged as one of the most promising drug-delivery technologies owing to several benefits like circumventing premature drug release, offering controlled and targeted drug delivery, improving the stability, safety, and kinetics of conjugated drugs, and so forth. In recent years, PDC technology has advanced with the objective to further enhance the treatment outcomes by integrating nanotechnology and multifunctional characteristics into these systems. One such development is the ability of PDCs to act as theranostic agents, permitting simultaneous diagnosis and treatment options. Theranostic nanocarriers offer the opportunity to track the distribution of PDCs within the body and help to localize the diseased site. This characteristic is of particular interest, especially among those therapeutic approaches where external stimuli are supposed to be applied for abrupt drug release at the target site for localized delivery to avoid systemic side effects (e.g., Visudyne®). Thus, with the help of this review article, we are presenting the most recent updates in the domain of PDCs as nanotheranostic agents. Different methodologies utilized to design PDCs along with imaging characteristics and their applicability in a wide range of diseases, have been summarized in this article.


LWT ◽  
2016 ◽  
Vol 74 ◽  
pp. 294-302 ◽  
Author(s):  
Yan Zhang ◽  
Hu Hou ◽  
Yan Fan ◽  
Fangfang Zhang ◽  
Bafang Li ◽  
...  

Author(s):  
Lyndsie M. Koon ◽  
Robert J. Brustad ◽  
Megan Babkes Stellino

Physical activity participation is a non-pharmaceutical intervention that can be utilized to maintain and improve cognitive function in aging adults. Although simple physical activities yield positive results in regards to cognitive function, cognitively and motorically complex physical activities may have an even greater benefit on neuroplasticity for older adults. Commercially available products such as physical activity apps or exergames offer this population a means to engage in regular physical activity on their own. However, a taxonomy is necessary to help distinguish simpler physical activities from more complex physical activities. The taxonomy proposed in this paper carefully considers the following characteristics: the stability or transport of the body, object manipulation, intertrial variability, the environmental context and the reaction or to others. The dimensions of the taxonomy are operationally defined and practical applications are provided.


2018 ◽  
Vol 27 (1) ◽  
pp. 40-53
Author(s):  
Julie Gaillard

This article analyzes how, in Footfalls, Beckett erodes subjective certainty as well as bodily evidence by calling into question the stability of referential mechanisms. Focusing on proper names and analyzing closely how they articulate (or rather disarticulate) personal pronouns and bodily referents, it shows how their unhinging produces a de-stabilization of reality, which has the paradoxical effect of calling into question the subjective unity and permanence of the body present on stage. This article follows the various movements of this short play to trace series of shifts and glitches in the pragmatics of enunciation, and shows how these glitches call into question the identity of the enunciating ‘I’ as well as the reality of its links to the body that it refers to.


Author(s):  
Yasmin Khakpour ◽  
Miad Yazdani

In this work, numerical simulation is used to study the stability enhancement of high speed supercavitating hydrofoils. Although supercavitation is known as one of the most effective methods for drag reduction, producing the cavity, either by ventilation or by cavitator at front of the body, may cause some instabilities on cavity surface and thus on the projectile’s motion. Therefore removing these instabilities comes as an important point of discussion. First of all, we calculate the sources of instabilities and measure respective forces and then present some approaches that significantly reduce these instabilities. One of these methods that could produce more stable supercavities is injecting of the air into the cavity unsteadily which varies through the projectile’s surface. This approach is provided by arrays of slots distributed on the projectile’s surface and unsteady injection is modeled over the surface. Furthermore, the position of ventilation, dramatically affects the stability like those in aerodynamics. In all approaches it is assumed that the supercavity covers the whole of the body, however the forces caused by the wakes, formed behind the body are taken into account. The calculation is performed at three cavitation numbers with respective velocities of 40 m/s, 50 m/s, 60 m/s.


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