Research on Balancing of a Multi-Link High-Speed Precision Press

2013 ◽  
Vol 567 ◽  
pp. 175-182
Author(s):  
Xin Jian Lu ◽  
Si Hong Zhu ◽  
Lei Kang ◽  
Mao Hua Xiao
Keyword(s):  
Computer Program ◽  
High Speed ◽  
Kinetic Equations ◽  
Inertial Force ◽  
The Other ◽  
Inertial Forces ◽  
Software Environment ◽  
The Press ◽  
Calculation Results ◽  
The One

Balancing mechanism for a multi-link high-speed precision press has been proposed and kinetic equations for the press with balancing mechanism have been derived also. The corresponding computer program has been developed on the basis of Matlab software environment. Take the press developed in the research as an example to calculate for studying balancing effect of this mechanism. Calculation results show that the balancing mechanism can significantly reduce vertical inertial force acted on the bed on the one hand; on the other hand the horizontal inertial forces of some parts and torque need will be increased. Results of the research mentioned above can be used for development of the multi-link high-speed precision press.

Influence of Crank Radius on the Curve Shapes for a Multi-Link High-Speed Precision Press

2011 ◽  
Vol 141 ◽  
pp. 313-318 ◽  
Author(s):  
Xin Jian Lu ◽  
Si Hong Zhu ◽  
Zun Mang Ke ◽  
Jian Qin ◽  
Shao Wei
Keyword(s):  
Simulation Model ◽  
Dynamic Simulation ◽  
High Speed ◽  
Lateral Force ◽  
Inertial Forces ◽  
Software Environment ◽  
Bottom Dead Center ◽  
The Press ◽  
Adams Software ◽  
Dynamic Simulation Model

The parameterized dynamic simulation model for a multi-link high precision press has been established in the ADAMS software environment based on the displacement equations. The press being developed is taken as an example to study the slider’s displacement curves, velocity curves and acceleration curves under different crank radius in practice as well as the working angle curves and torque curves. With the crank radius increasing, the started punching angle comes early and the slider’s velocity and acceleration at bottom dead center (B.D.C) decreases significantly which help to improve the accuracy of B.D.C and to lower the torque consumption during stamping. Meanwhile, the increasing of working angle helps to reduce the lateral force acting on the slider, such as the torque required to overcome the inertial forces increases rapidly, the torque needed to overcome the nominal force decreases and the peak of nominal force shifts to the lower left gradually. Results of the research mentioned above are helpful to develop the multi-link high-speed press.

Aeroelastic Problems in connection with High-Speed Flight

1956 ◽  
Vol 60 (547) ◽  
pp. 459-475 ◽  
Author(s):  
E. G. Broadbent
Keyword(s):  
Mach Number ◽  
High Speed ◽  
The Other ◽  
Control Surface ◽  
The Past ◽  
Other Hand ◽  
Aerodynamic Derivatives ◽  
Mach Numbers ◽  
The One

SummaryA review is given of developments in the field of aeroelasticity during the past ten years. The effect of steadily increasing Mach number has been two-fold: on the one hand the aerodynamic derivatives have changed, and in some cases brought new problems, and on the other hand the design for higher Mach numbers has led to thinner aerofoils and more slender fuselages for which the required stiffness is more difficult to provide. Both these aspects are discussed, and various methods of attack on the problems are considered. The relative merits of stiffness, damping and massbalance for the prevention of control surface flutter are discussed. A brief mention is made of the recent problems of damage from jet efflux and of the possible aeroelastic effects of kinetic heating.

scholarly journals Artificial intelligence and copyright

2021 ◽  
pp. 15-22
Author(s):  
Daryna Prylypko
Keyword(s):  
Artificial Intelligence ◽  
Computer Program ◽  
Key Words ◽  
Automatic Generation ◽  
The Other ◽  
International Level ◽  
Human Agent ◽  
Foreign Countries ◽  
The One ◽  
Justice Practice

Key words: copyright, work, artificial intelligence, computer program In the article, the problemsof legislation of Ukraine regarding the issues of copyright on works created due to artificialintelligence were analyzed. Particularly, who is the owner of copyright ofworks created due to artificial intelligence. On the one hand, it could be a developer ofa computer program, from the other hand, it could be a client or an employer. Because,it could happen that there is a situation when robots created something newand original, e.g., how it happened with the project “New Rembrandt”. In this case,computers created a unique portrait of Rembrandt. And here is a question, where isin this portrait original and intellectual works of developers of these computers andprograms. In the contrast, this portrait could be created without people who developedspecial machines, programs, and computers. The article’s author proposes to addinto Ukrainian legislation with following norm: the owner of the copyright createddue to artificial intelligence should be a natural person who uses artificial intelligencefor these purposes within the official relationship or on the basis of a contract. In caseof automatic generation of such work by artificial intelligence, the owner of copyrightshould be the developer.Also, another question arises, particularly, who will be responsible for the damagecaused by the artificial intelligence. As an example, of the solution for this issue Resolution2015/2103 (INL) was given, where is mentioned that human agent could be responsiblefor the caused damage. Because, it is not always a developer is responsiblefor the damage.Also, the legislation and justice practice of foreign countries was explored. Theways of overcoming mentioned problems in legislation of Ukraine were proposed.Such as changing our legislation and giving the exact explanation in who is the ownerof copyright on works created due to artificial intelligence and in which cases this personcould become an owner of the copyright. However, probably, these issues shouldbe resolved at international level regarding globalization.

WATER FLOWS AROUND THE COMB PLATES OF THE CTENOPHORE PLEUROBRACHIA PLOTTED BY COMPUTER: A MODEL SYSTEM FOR STUDYING PROPULSION BY ANTIPLECTIC METACHRONISM

1993 ◽  
Vol 177 (1) ◽  
pp. 113-128 ◽  
Author(s):  
D. Barlow ◽  
M. A. Sleigh ◽  
R. J. White
Keyword(s):  
Computer Program ◽  
Water Flow ◽  
High Speed ◽  
Beat Frequency ◽  
Longitudinal Axis ◽  
Model System ◽  
The Other ◽  
Contour Maps ◽  
Water Flows ◽  
Pleurobrachia Pileus

Patterns of water flow around steadily beating comb plates of Pleurobrachia pileus were tracked using suspended plastic beads. The positions of the beads and the comb plates in the plane of the central longitudinal axis of the comb row were digitised from high-speed cine films covering several beat cycles. All of the data from each sequence were combined using a computer program which integrated them into a standard cycle, and the resulting data were plotted by a second computer program to produce charts for different stages in the beat cycle showing the flow velocity at a grid of points. On these charts, contour maps were drawn to indicate the speed and direction of the water flow. Water is drawn towards each comb row from ahead and from the sides and accelerates strongly backwards in a fairly narrow stream which joins those from the other seven comb rows at the rear of the animal. At a beat frequency of 10 Hz the comb plates move with a tip speed of up to 70 mm s-1 in their effective stroke; they have an estimated Reynolds number of 9 in this stroke. Changes in inter- plate volume between adjacent antiplectically coordinated plates are very important in propulsion, particularly near the end of the effective stroke when pairs of adjacent plates close together and cause the high-speed water from around the ciliary tips to be shed into the overlying stream as a series of jets at speeds of 50 mm s-1 or more. The antiplectic coordination of the comb plates makes a major contribution to the efficiency of propulsion.

The Position of the Insurance Press in relation to Insurance Offices and Insurance Interests

1881 ◽  
Vol 23 (1) ◽  
pp. 18-28
Author(s):  
Cornelius Walford
Keyword(s):  
The Other ◽  
Individual Responsibility ◽  
The Press ◽  
The Subject ◽  
The Many ◽  
The One ◽  
The Individual

I think the time has arrived when the subject indicated in the title of this paper may be fairly and fully considered. It is certainly one which must frequently have presented itself to the managerial mind; and there can be no reason why this question should not be discussed with as much philosophic calmness as any of the many theoretical problems, or points in practice, which continually present themselves for reflection, and perchance for decision.The point may indeed arise—whether I am the proper person to introduce the topic. I take the individual responsibility of deciding in the affirmative. I have, on the one hand, been as frequently assailed by the insurance press, as any one, and, on the other, received as much kindness and friendly recognition as any man can desire, and more than I claim to deserve. It may be that in either case the extreme has been reached, or passed. I have the advantage of having been a writer upon the press, insurance and general, from the days of my youth, and I say at once that my sympathies are largely on that side. But I think that the familiarity which draws me to the side of its virtues, also renders me, at least in some degree, cognizant of its short-comings. I have the further advantage of having been on various occasions consulted by managers on the one hand, and by editors on the other, upon the points which I now proceed to discuss.

Liberaal en flamingant. Pol De Mont als politicus

2014 ◽  
Vol 73 (3) ◽  
pp. 202-225
Author(s):  
Ludo Stynen
Keyword(s):  
Student Leaders ◽  
The Other ◽  
Local Elections ◽  
Party Discipline ◽  
The Public ◽  
Other Hand ◽  
The Press ◽  
The One ◽  
Relationship Of

De dichter Pol De Mont, ooit een der eerste Vlaamse studentenleiders, raakte al snel bekend om zijn strijdbare Vlaamsgezinde, democratische en vrijzinnige standpunten. Bovendien wist hij als spreker moeiteloos een publiek mee te slepen. Toen de Antwerpse Liberale Vlaamsche Bond hem aar voren schoof als kandidaat voor de gemeenteraadsverkiezingen van 1890 was dat niet naar de zin van machtige Association libérale. Deze bijdrage heeft aandacht voor de perscampagne tegen De Mont, voor de tegenstellingen binnen de Antwerpse liberalen, en voor De Monts activiteiten in de Antwerpse provincieraad waarvoor hij in 1892 wel verkozen raakte. Belicht wordt de moeilijke relatie van toonaangevende Antwerpse liberale kringen en het flamingantische enerzijds, de onverenigbaarheid van De Monts idealen met de partijtucht anderzijds.________Liberal and supporter of the Flemish movement: Pol De Mont as a politician.The poet Pol De Mont, once one of the first Flemish student leaders soon became known for his militant pro-Flemish, democratic and liberal views. Moreover, he effortlessly managed to win over the public as a speaker. When the Antwerp Liberal Flemish Union proposed him as a candidate for the local elections in 1890, this displeased the powerful Association libérale. This contribution focuses on the press campaign against De Mont, the contradictions within the group of the Antwerp liberals, and the activities of De Mont in the Antwerp provincial council into which he did get elected in 1892. The article discusses the difficult relationship of the leading Antwerp liberal circles and the pro-Flemish movement on the one hand and the incompatibility between the ideals of De Mont and the party discipline on the other hand.

The Pitfalls and Perils of Being a Digital Journalist in Venezuela

2020 ◽  
pp. 319-337
Author(s):  
Mariateresa Garrido
Keyword(s):  
Digital Media ◽  
Freedom Of Expression ◽  
Secondary Data ◽  
The Other ◽  
Freedom Of The Press ◽  
The Past ◽  
Other Hand ◽  
The Press ◽  
The One ◽  
The Right

To be a journalist in Venezuela is very dangerous. In the past decade, there has been an increase of attacks against media and their personnel. On the one hand, attacks against journalists include harassment (physical, digital, legal), illegal detentions, kidnapping, and assassination. On the other hand, digital media have experienced blockages (DNS), internet shutdowns and slow-downs, failures in the connection, and restrictions to access internet-based platforms and content. Since 2014, the situation is deteriorating and limitations to exercise the right to freedom of expression have increased. However, this issue remains understudied; hence, this chapter considers primary and secondary data to analyze the types of limitations experienced by Venezuelan digital journalists from 2014 to 2018, explains the effects of ambiguous regulations and the use of problematic interpretations, and describes the inadequacies of national policies to promote freedom of the press.

De ontzuildheid nabij ? : Een exploratief inhoudsanalytisch onderzoek naar verzuildheid en ontzuiling van de naoorlogse geschreven pers in Vlaanderen

Res Publica ◽  
1999 ◽  
Vol 41 (4) ◽  
pp. 451-480
Author(s):  
Bart Distelmans
Keyword(s):  
Trade Unions ◽  
Structural Transformations ◽  
The Other ◽  
Postwar Period ◽  
Onderzoek Naar ◽  
The Press ◽  
The One ◽  
The Impact

During the postwar period, the Flemish press-scene changed fundamentally.  Alongside further commercialization and concentration, a process of structural depoliticization or depillarization took place: (financial) links betweenparties and trade unions on the one hand and newspapers on the other disappeared. This article examines the impact ofthese structural transformations on the newspapers' content. We emphasize marks of (de)pillarization in Flemish newspapers during cabinet formations. In 1958, the press took undeniably sides in the battle between the pillars: information about the formation of the new cabinet formed the background for these fights. In 1981 most attention went to the cabinet formation itself. The pillarization ofthe content was however on a more latent level not neglectable. Compared to 1958 and 1981 the old alliances between press and ideological institutions were far less visible in the content of 1995's newspapers. Apparently the depillarization ofthe Flemish press-content is an ongoing, longlasting process.

scholarly journals The case of Dr. Piotrovich with forensic medicine subtle vision

2020 ◽  
Vol 8 (5) ◽  
pp. 454-468
Author(s):  
V. I. Stolts
Keyword(s):  
Public Opinion ◽  
Forensic Medicine ◽  
The Other ◽  
Other Hand ◽  
Public Meeting ◽  
The Press ◽  
Professional Issue ◽  
The One ◽  
Broad Generalization

The Bureau of the Gynecological Society instructed me, as an expert on the Petrovich case, to examine this case in today's public meeting. Taking into account, on the one hand, the fact that Dr. Petrovich is one of our members and that the determination of his moral guilt on a professional issue, drawn up not on the basis of subjective interpretations, which is full of the court's opinion, the opinion of the press and public opinion, but on the basis of strict and objective verification of Petrovich's actions should be of interest to the Gynecological Society, and on the other hand, having in mind the broad generalization of conclusions from this case in relation to doctors, as the prosecutor did in his speech and as the press does to this day, I I willingly took on this task and I want to share with you, gentlemen, my views on this matter and ask you to give your competent opinion on the issues that I will have the honor to pose and the resolution of which should clarify the guilt or lack thereof of Piotrovich.

scholarly journals Public Service Television and Civic Engagement

2018 ◽  
Author(s):  
Daniel Jackson
Keyword(s):  
News Media ◽  
Main Channel ◽  
The Self ◽  
The Other ◽  
The Core ◽  
The Press ◽  
The Media ◽  
The One ◽  
Democratic Life ◽  
Elected Representatives

The news media figures prominently in most appraisals of democracy today. This is because it is the main channel of communication between elected representatives and citizens; and the (self-appointed) watchdog of the powerful. While news organisations are sometimes reluctant to accept the responsibility that comes with such power, it is implicit in the core principles of journalistic philosophy, whereby attempts to constrain or censor the news media are seen as threats to democracy itself. However, these normative roles also are surrounded by many tensions that surround the ability of our news media to perform their democratic functions. This chapter discusses four of these tensions: (i) diversity versus commonality; (ii) the information necessary for citizens to participate effectively in democratic life, versus the entertainment-driven focus of an increasingly commercial-oriented media; (iii) the need of the media to treat people as citizens on the one hand and as consumer publics on the other; and (iv) broadcasters' relationship with the press.

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