scholarly journals Attitude reactionless and vibration control in space flexible robot grasping operation

2018 ◽  
Vol 15 (6) ◽  
pp. 172988141881830 ◽  
Author(s):  
Cheng Wei ◽  
Haiyu Gu ◽  
Yuqiang Liu ◽  
Yang Zhao
Keyword(s):  
Dynamic Models ◽  
Vibration Suppression ◽  
Null Space ◽  
Flexible Robot ◽  
Damping Control ◽  
Key Issues ◽  
Robot Grasping ◽  
The Impact ◽  
Reaction Null Space ◽  
Reactionless Control

When a space flexible robot captures a floating target, the manipulator vibration and the impact reacting onto the base attitude are the key issues which may cause critical safety problems. In this investigation, the attitude reactionless control and the vibration suppression are considered in the meantime to reduce the risk in grasping operation. The dynamic models of the space flexible robot and the target are established, and then the Dynamic Grasping Area is introduced to describe the contact procedure of the capture device grasping target. Even though the flexible vibration of the manipulator can be easily suppressed by using the conventional joint active damping control, the reaction impact to the base attitude is serious and unacceptable. The simulation results indicate that, by using the optimal control for the vibration suppression in the attitude reaction null space, the vibration of the manipulator could be alleviated significantly and the base attitude is also almost undisturbed in the meantime during the whole grasping procedure.

Monetary policy and the effect of the transfer of oil prices to inflation

2020 ◽  
pp. 41-50
Author(s):  
Ph. S. Kartaev ◽  
I. D. Medvedev
Keyword(s):  
Monetary Policy ◽  
Inflation Targeting ◽  
Dynamic Models ◽  
Oil Prices ◽  
Oil Price ◽  
Oil Price Shocks ◽  
Negative Effects ◽  
Price Shocks ◽  
Policy Regime ◽  
The Impact

The paper examines the impact of oil price shocks on inflation, as well as the impact of the choice of the monetary policy regime on the strength of this influence. We used dynamic models on panel data for the countries of the world for the period from 2000 to 2017. It is shown that mainly the impact of changes in oil prices on inflation is carried out through the channel of exchange rate. The paper demonstrates the influence of the transition to inflation targeting on the nature of the relationship between oil price shocks and inflation. This effect is asymmetrical: during periods of rising oil prices, inflation targeting reduces the effect of the transfer of oil prices, limiting negative effects of shock. During periods of decline in oil prices, this monetary policy regime, in contrast, contributes to a stronger transfer, helping to reduce inflation.

scholarly journals Online Reviews and Product Sales: The Role of Review Visibility

2021 ◽  
Vol 16 (4) ◽  
pp. 638-669
Author(s):  
Miriam Alzate ◽  
Marta Arce-Urriza ◽  
Javier Cebollada
Keyword(s):  
Decision Making ◽  
Dynamic Models ◽  
Generalized Method Of Moments ◽  
Online Reviews ◽  
Consumer Decision Making ◽  
Product Sales ◽  
The Impact ◽  
The Relationship ◽  
The Empirical Analysis

When studying the impact of online reviews on product sales, previous scholars have usually assumed that every review for a product has the same probability of being viewed by consumers. However, decision-making and information processing theories underline that the accessibility of information plays a role in consumer decision-making. We incorporate the notion of review visibility to study the relationship between online reviews and product sales, which is proxied by sales rank information, studying three different cases: (1) when every online review is assumed to have the same probability of being viewed; (2) when we assume that consumers sort online reviews by the most helpful mechanism; and (3) when we assume that consumers sort online reviews by the most recent mechanism. Review non-textual and textual variables are analyzed. The empirical analysis is conducted using a panel of 119 cosmetic products over a period of nine weeks. Using the system generalized method of moments (system GMM) method for dynamic models of panel data, our findings reveal that review variables influence product sales, but the magnitude, and even the direction of the effect, vary amongst visibility cases. Overall, the characteristics of the most helpful reviews have a higher impact on sales.

scholarly journals Laboratory test and numerical simulation of composite geomembrane leakage in plain reservoir

2021 ◽  
Vol 13 (1) ◽  
pp. 651-662
Author(s):  
Jinping Luo ◽  
Guoxiang Huang ◽  
Yanni Shao ◽  
Jian Liu ◽  
Quanyi Xie
Keyword(s):  
Laboratory Test ◽  
Water Shortage ◽  
Seepage Discharge ◽  
Threshold Distance ◽  
Water Head ◽  
Large Populations ◽  
Key Issues ◽  
Single Factor Analysis ◽  
The Impact ◽  
Leakage Location

Abstract Plain reservoir plays an important role in alleviating water shortage in plain areas which are generally crowded with large populations. As an effective and cheap anti-seepage measure, geomembrane is widely applied in plain reservoirs. Therefore, it is necessary to investigate the seepage discharge caused by composite geomembrane leakage. The laboratory test and numerical calculation are carried out in this paper to analyze the influence of three factors (i.e., water head, leakage size, and leakage location) on seepage discharge. It is found from the results of the orthogonal and single-factor analysis that the impact order of the three factors on the seepage discharge of plain reservoir is: distance from dam toe > water head > leakage size. Moreover, the seepage discharge increases as the water head, leakage size, and leakage quantity increase, in a linear relation. The opposite trend can be sawed in the seepage discharge when the distance from dam toe rises. Furthermore, a threshold distance is innovatively presented based on the results of numerical analysis. The ranking of three factors has enlightening significance for future scholars to track and study key issues of the leakage of composite geomembrane. The threshold distance presented in this paper is beneficial for engineers to manage and maintain the reservoir. Generally, the findings of this study can be beneficial to deepen the understanding of the influence of composite geomembrane leakage on the plain reservoirs.

Practitioner Review: Continuity and Change: The Fair Work Act in Aviation

2011 ◽  
Vol 53 (3) ◽  
pp. 392-401 ◽  
Author(s):  
Sue Bussell ◽  
John Farrow
Keyword(s):  
Industrial Relations ◽  
Safety Net ◽  
Aviation Industry ◽  
Continuity And Change ◽  
National Debate ◽  
New Development ◽  
Key Issues ◽  
The Individual ◽  
The Impact

This article begins by discussing the specific industrial relations challenges of the highly competitive aviation industry. It then reflects on the outcome of the recent intense national debate over industrial relations, exploring the consequences of that debate for practice and policy, and discusses some key issues that remain in play. Although the Fair Work Act 2009 may have come about as a reaction to what many perceive as the ‘excesses’ of Work Choices, the new Act does not so much ‘wind back the clock’ as represent a significant new development in Australia’s long and unique industrial relations history. This article will discuss the impact of the changes, to date, made by the Fair Work Act on one organization, including the expansion of the ‘safety net’, and how the new compromise between the role of the ‘collective’ and the role of the ‘individual’ struck by the Act has the potential to fundamentally change the nature and structure of bargaining. We offer these comments as practitioners who have worked under successive industrial relations regimes since the early 1980s.

scholarly journals Portrait of the ‘Absent’ Father: The Impact of Non-Residency on Developing and Maintaining a Fathering Role

2005 ◽  
Vol 14 (2) ◽  
pp. 134-154 ◽  
Author(s):  
Mary P. Corcoran
Keyword(s):  
Exploratory Study ◽  
Active Role ◽  
Absent Father ◽  
Key Factors ◽  
Social Barriers ◽  
Institutional Economic ◽  
Key Issues ◽  
The Impact

This paper reports on an exploratory study conducted with non-resident fathers, to elucidate the key issues affecting the development and maintenance of a fathering role after a relationship has ended. In particular, the paper focuses on the contingent nature of fatherhood for young marginalised men in Dublin. The extent to which fathers identify with a fathering role is explored and comparisons are drawn between the experiences of estranged, committed and activist fathers. Key factors that militate against fathers maintaining an active role in their children's lives are identified. The paper concludes that while the experiences of fatherhood vary across different categories of fathers, the majority of them aspire toward and value their fathering role. However, their capacity to adopt a positive fathering role is affected by a range of institutional, economic and social barriers.

scholarly journals ANALYSIS OF THE CURRENT LOGISTICS AND TRANSPORT CHALLENGES IN THE CONTEXT OF THE CHANGING ENVIRONMENT

Transport ◽  
2015 ◽  
Vol 30 (2) ◽  
pp. 233-241 ◽  
Author(s):  
Jurgita Barysienė ◽  
Nijolė Batarlienė ◽  
Darius Bazaras ◽  
Kristina Čižiūnienė ◽  
Daiva Griškevičienė ◽  
...  
Keyword(s):  
Business Processes ◽  
Legal Framework ◽  
Transport Sector ◽  
Changing Environment ◽  
Foreign Countries ◽  
Baltic Sea Region ◽  
Key Issues ◽  
The Baltic ◽  
The Impact ◽  
Transport Management

The rapidly changing world determines changes in the business processes. Logistics and transport are the areas facing constant changes. Therefore, an important point is to analyse the current problems of logistics and transport within the context of the changing environment. For many years, the experts of the Dept of Logistics and Transport Management of the Faculty of Transport Engineering from Vilnius Gediminas Technical University have been pursuing research both, in the Baltic Sea Region (BSR) in Lithuania and foreign countries. This research has been directed toward improvements to logistics and the entire supply chain in pursuit of economic, social and ecological competitiveness, an increase in the competitiveness and attractiveness of the transport system in the context of sustainable development, the impact of this system on the economic and social welfare of society, an increase in the competitiveness and attractiveness of the transport sector of improving the legal framework and the application of innovative technologies (including IT) in the transport sector aimed at implementing economic and social cohesion goals. The article deals with some of the key issues of the above introduced research.

scholarly journals Assessing the impact of widespread respirator use in curtailing COVID-19 transmission in the USA

2021 ◽  
Vol 8 (9) ◽  
pp. 210699
Author(s):  
Calistus N. Ngonghala ◽  
James R. Knitter ◽  
Lucas Marinacci ◽  
Matthew H. Bonds ◽  
Abba B. Gumel
Keyword(s):  
Dynamic Models ◽  
Effective Control ◽  
Natural Immunity ◽  
Third Wave ◽  
Respiratory Protection ◽  
The Third ◽  
Surgical Masks ◽  
The Usa ◽  
Baseline Levels ◽  
The Impact

Dynamic models are used to assess the impact of three types of face masks (cloth masks, surgical/procedure masks and respirators) in controlling the COVID-19 pandemic in the USA. We showed that the pandemic would have failed to establish in the USA if a nationwide mask mandate, based on using respirators with moderately high compliance, had been implemented during the first two months of the pandemic. The other mask types would fail to prevent the pandemic from becoming established. When mask usage compliance is low to moderate, respirators are far more effective in reducing disease burden. Using data from the third wave, we showed that the epidemic could be eliminated in the USA if at least 40% of the population consistently wore respirators in public. Surgical masks can also lead to elimination, but requires compliance of at least 55%. Daily COVID-19 mortality could be eliminated in the USA by June or July 2021 if 95% of the population opted for either respirators or surgical masks from the beginning of the third wave. We showed that the prospect of effective control or elimination of the pandemic using mask-based strategy is greatly enhanced if combined with other non-pharmaceutical interventions (NPIs) that significantly reduce the baseline community transmission. By slightly modifying the model to include the effect of a vaccine against COVID-19 and waning vaccine-derived and natural immunity, this study shows that the waning of such immunity could trigger multiple new waves of the pandemic in the USA. The number, severity and duration of the projected waves depend on the quality of mask type used and the level of increase in the baseline levels of other NPIs used in the community during the onset of the third wave of the pandemic in the USA. Specifically, no severe fourth or subsequent wave of the pandemic will be recorded in the USA if surgical masks or respirators are used, particularly if the mask use strategy is combined with an increase in the baseline levels of other NPIs. This study further emphasizes the role of human behaviour towards masking on COVID-19 burden, and highlights the urgent need to maintain a healthy stockpile of highly effective respiratory protection, particularly respirators, to be made available to the general public in times of future outbreaks or pandemics of respiratory diseases that inflict severe public health and socio-economic burden on the population.

scholarly journals Kebebasan Hak Ijtihad Nikah Beda Agama Pasca Putusan Mahkamah Konstitusi

2016 ◽  
Vol 12 (3) ◽  
pp. 604
Author(s):  
Faiq Tobroni
Keyword(s):  
The State ◽  
Constitutional Court ◽  
Constitutional Rights ◽  
Interfaith Marriage ◽  
The Third ◽  
Interfaith Marriages ◽  
Key Issues ◽  
Marriage Laws ◽  
Constitutional Right ◽  
The Impact

This paper has three key issues. The first issue discusses the arguments constructed by applicant of judicial review (JR) to assess the constitutional rights’ violations caused by the application of Article 2 (1) UUP. The second issue discusses on how the Constitutional Court (MK) seated position of state associated marital affairs in the rejection of JR. The third issue discusses model of freedom of ijtihad (legal thought) on interfaith marriage as the impact of MK’s Decision. Based on    the discussion, regarding to the first issue, the applicant of JR assess the application of Article 2 (1) UUP has legitimized the state as the sole interpreters of religious teachings for a requirement validity of the marriage. According to the applicant,  the role is used by the state (The Office for Religious Affairs/KUA) to not accept interfaith marriage. This refusal led to the violation of some other constitutional rights. Furthermore, as the findings of the second issue, MK’s decision has placed   the real position of state not as interpreters of religious teachings, but merely to accommodate the results of religious scholars’s ijtihad regarding marriage into the state law. Thus, it is not true that the state has violated the constitutional right to more intervene the religious life of citizens. Last findings as the third issue, MK’s decision has affected the model of ijtihad freedom on interfaith marriage. Actually interfaith marriage can still be served through the Civil Registry Office (KCS). KCS could be an alternative way to facilitate the interfaith marriages for all religions in Indonesia. Special for KUA, the institution reject to record interfaith marriage.   In this way, it only accommodates freedom of ijtihad within the limits of ijtihad jama’i. KUA just accomodates ijtihad by institutions such as the Majelis Ulama Indonesia, Nahdlatul Ulama, Muhammadiyah and other similar institutions that reject interfaith marriage. Special for marriage in muslim community, ijtihad jama’i is better than ijtihad fardiy because the second could trigger the liberalization of marriage laws (temporary marriages, polygamy more than four, underage marriages and denial of recording).

scholarly journals Funkcje mediacyjne realizowane przez mediatora w trakcie mediacji. Wybrane zagadnienia

2018 ◽  
Vol 27 (3) ◽  
pp. 73
Author(s):  
Marzena Myślińska
Keyword(s):  
Legal Regulation ◽  
Professional Role ◽  
Legal Order ◽  
Mediation Process ◽  
Legal Relationship ◽  
The Social ◽  
Key Issues ◽  
The Subject ◽  
The Impact

<p>The subject of this article is the analysis of the activity undertaken during mediation in the context of the characteristics of the mediation process and the normative conditions of the legal relationship and disputes resolved through this form of ADR. In order to implement the project, the content of the work will contain a list of functions performed by the mediator during mediation as ‘the environment for performing the role’ (which is not closed due to the dynamics of interaction in the negotiations). Their character and content determine the nature of the social and professional role of mediators in the Polish legal order, it also allows us to illustrate in detail the key issues for reflection on the professional role, including, for example, legal liability and conflict of roles. Mediation functions are diversified in terms of the frequency of their implementation depending, among other things, on the strategy of conducting mediation, the specificity of the dispute and the legal regulation of mediation. The discussion of the last of the indicated differentiating factors (i.e. the impact of universally binding law) will be reflected in the content of the paper.</p>

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