Is Vietnam the Right Choice for Foreign Investment?: The Case of the European Union’s Slipping Opportunity. ACES Working Papers, 2012

This analysis is broken into three interdependent sections: First, an analysis of the restrictions placed on foreign direct investment in Vietnam captures the current freedoms and inhibitors of investment in Vietnam. Foreign direct investment is defined by the UN as an investment made to acquire a lasting interest in or effective control over an enterprise operating outside of the economy of the investor. Second, a cursory look at the macroeconomic risks, to which investment dollars are susceptible, will paint a realistic portrait of return of foreign investment. Finally, this paper will examine the current, and historical, trade relationship between Vietnam and the European Union, in order to convey that the opportunity for investment in Vietnam remains to be an opportunity for Europe’s developed economies.

Novel method for measuring nanofriction by atomic force microscope

The authors describe a novel approach to the measurement of nanofriction, and demonstrate the application of the method by measurement of the coefficient of friction for diamondlike carbon (DLC) on DLC, Si on DLC, and Si on Si surfaces. The technique employs an atomic force microscope in a mode in which the tip moves only in the z (vertical) direction and the sample surface is sloped. As the tip moves vertically on the sloped surface, lateral tip slipping occurs, allowing the cantilever vertical deflection and the frictional (lateral) force to be monitored as a function of tip vertical deflection. The advantage of the approach is that cantilever calibration to obtain its spring constants is not necessary. Using this method, the authors have measured friction coefficients, for load range 0 < L M 6 mu N, of 0.047 +/- 0.002 for Si on Si, 0.0173 +/- 0.0009 for Si on DLC, and 0.0080 +/- 0.0005 for DLC on DLC. For load range 9 < L < 13 mu N, the DLC on DLC coefficient of friction increased to 0.051 +/- 0.003. (C) 2008 American Vacuum Society.

A layered finite element for reinforced concrete beams with bond-slip effects

The behaviour of reinforced concrete members is affected by the slipping of steel bars inserted in the concrete matrix. A tension-stiffening effect and crack evolution occur from the beginning of slipping; thus, the assessment of those phenomena requires the introduction of a bond-slip interaction model. This work presents a beam-layered model, including the constitutive relationships of materials and their interaction, according to the CEB-FIP Model Code 1990. To eliminate the finite element sub-division procedure, a continuous slip function is imposed into the element domain. The results are continuous descriptions of bond stress in the steel-concrete interface, as well as concrete and steel stresses along the element. (C) 2007 Elsevier Ltd. All rights reserved.

Análise numérico-experimental do comportamento da aderência aço-concreto

Dissertação (mestrado)—Universidade de Brasília, Faculdade de Tecnologia, Departamento de Engenharia Civil e Ambiental, 2016.

Angular and linear accelerations of a rolling cylinder acted by an external force

The dynamics of a cylinder rolling on a horizontal plane acted on by an external force applied at an arbitrary angle is studied with emphasis on the directions of the acceleration of the centre-of-mass and the angular acceleration of the body. If rolling occurs without slipping, there is a relationship between the directions of these accelerations. If the linear acceleration points to the right, then the angular acceleration is clockwise. On the other hand, if it points to the left, then the angular acceleration is counterclockwise. In contrast, if rolling and slipping occurs, the direction of the linear acceleration does not determine the direction of the angular acceleration. For example, the linear acceleration may point to the right and the angular acceleration clockwise or counterclockwise depending on the external force orientation and point of application.

Distributed active traction control system applied to the RoboCup middle size league

This work addresses the problem of traction control in mobile wheeled robots in the particular case of the RoboCup Middle Size League (MSL). The slip control problem is formulated using simple friction models for ISePorto Team robots with a differential wheel configuration. Traction was also characterized experimentally in the MSL scenario for relevant game events. This work proposes a hierarchical traction control architecture which relies in local slip detection and control at each wheel, with relevant information being relayed to a higher level responsible for global robot motion control. A dedicated one axis control embedded hardware subsystem allowing complex local control, high frequency current sensing and odometric information procession was developed. This local axis control board is integrated in a distributed system using CAN bus communications. The slipping observer was implemented in the axis control hardware nodes integrated in the ISePorto robots and was used to control and detect loss of for traction. %and to detect the ball in the kicking device. An external vision system was used to perform a qualitative analysis of the slip detection and observer performance results are presented.

Characterization of cleaners accidents in the Portuguese service sector

This paper characterizes work accidents at Portuguese industrial cleaning companies, operating in the service sector, through the application of ESAW methodology. Data was codified based on the analysis of 748 accident claims to insurance companies (number of days lost 1 working day) in 3 large industrial cleaning companies for the period 2001-2003. Slipping and falling in the same level was the main deviation from the normal working process in the moment of the accident (in 25% of the accidents); uncoordinated movements was the second cause of accidents (14%); falls of persons to a lower level was the third cause of accidents (~10%), including falls from stairs (~7%) and falls from ladders and mobile ladders (~2%); globally, body movement under or with physical stress, including lifting, carrying, putting down, bending down, twisting, turning, trading badly, twisting leg or ankle and slipping without falling, were the cause in 17% of the accidents. Lower limbs were injured in ~25% of the accidents, hand and fingers in ~14%, the eye in ~4% and the back in ~9% of the accidents. An incidence rate of 3,580 accidents/100,000 employees was found to the sector (2003 data).

Acabamentos químicos em tecidos

Dissertação de mestrado em Técnicas de Caracterização e Análise Química

The fixation of the cemented femoral component. Effects of stem stiffness, cement thickness and roughness of the cement-bone surface.

After cemented total hip arthroplasty (THA) there may be failure at either the cement-stem or the cement-bone interface. This results from the occurrence of abnormally high shear and compressive stresses within the cement and excessive relative micromovement. We therefore evaluated micromovement and stress at the cement-bone and cement-stem interfaces for a titanium and a chromium-cobalt stem. The behaviour of both implants was similar and no substantial differences were found in the size and distribution of micromovement on either interface with respect to the stiffness of the stem. Micromovement was minimal with a cement mantle 3 to 4 mm thick but then increased with greater thickness of the cement. Abnormally high micromovement occurred when the cement was thinner than 2 mm and the stem was made of titanium. The relative decrease in surface roughness augmented slipping but decreased debonding at the cement-bone interface. Shear stress at this site did not vary significantly for the different coefficients of cement-bone friction while compressive and hoop stresses within the cement increased slightly.

Superjumborullien rullauksen hallinta

UPM-Kymmene Oyj:n Jämsänkosken PK6:n ongelmana ovat olleet ajoittaiset pohjakatkot suurilla rullilla. Diplomityön tavoitteena oli parantaa superjumborullien rullauksen hallintaa Jagenbergin rakentamalla VariTop keskiörullaimella. Kirjallisuusosassa selvitettiin rullanmuodostumista ja erilaisia rullausteorioita. Samalla käytiin läpi paperin rullautuvuuteen vaikuttavia tekijöitä, rullausperäisten vikojen muodostumisen syitä sekä pehmeän rullaussylinterin etuja verrattuna kovaan sylinteriin. Kokeellisessa osassa suoritettiin koeajoja tuotannon pituusleikkurilla. Näistä kokeista saatujen tulosten perusteella leikkurin ajoreseptit päivitettiin vastaamaanoptimaalisinta rullarakennetta. Pehmeän rullaussylinterin etuja verrattuna kovaan rullaussylinteriin selvitettiin koeajoissa Voithin koeleikkurilla Saksan Krefeldissä. Tuloksista selvisi, että samalla ajoreseptillä rullattaessa pehmeä sylinteri antoi valmiille rullalle suuremman kovuuden. Myös paperissa olevien profiilivirheiden vaikutukset lievenivät käytettäessä pehmeää rullaussylinteriä. Istukoiden luistamisesta johtuvaa hylsyjen sisäpinnan jauhautumista on ilmennyt suurilla jumborullilla. Tämä johtuu todennäköisimmin kasvaneesta rasituksesta hylsyn sisäpinnalla, mikä on seurausta rullien kasvusta. Ratkaisuina tälle ongelmalle on mahdollinen istukan pidentäminen sekä välyksen pienentäminen istukan ja hylsyn välissä. Myös hylsyjen toimintaa testattiin rullauksessa jahuomattiin niiden täyttävän toimittajien antamat laatuarvot. Lepo- ja liikekitkalla tiedetään olevan suuri merkitys rullausperäisten vikojenmuodostumiseen. Eri lajeista lähetettiin paperinäytteitä UPM-Kymmene Oyj:n Lappeenrannan tutkimuskeskukseen kitkojen määrittämiseksi. Tulosten perusteella havaittiin luettelolajilla lepo- ja liikekitkassa merkittävä ero. Standardi SC lajilla ero oli selvästi pienempi kuin luettelolajilla. Tämä saattaa olla yksi syy luettelolajeilla ilmeneviin pohjaongelmiin.

Dynamic analysis of belt-drives using the absolute nodal coordinate formulation

Belt-drive systems have been and still are the most commonly used power transmission form in various applications of different scale and use. The peculiar features of the dynamics of the belt-drives include highly nonlinear deformation,large rigid body motion, a dynamical contact through a dry friction interface between the belt and pulleys with sticking and slipping zones, cyclic tension of the belt during the operation and creeping of the belt against the pulleys. The life of the belt-drive is critically related on these features, and therefore, amodel which can be used to study the correlations between the initial values and the responses of the belt-drives is a valuable source of information for the development process of the belt-drives. Traditionally, the finite element models of the belt-drives consist of a large number of elements thatmay lead to computational inefficiency. In this research, the beneficial features of the absolute nodal coordinate formulation are utilized in the modeling of the belt-drives in order to fulfill the following requirements for the successful and efficient analysis of the belt-drive systems: the exact modeling of the rigid body inertia during an arbitrary rigid body motion, the consideration of theeffect of the shear deformation, the exact description of the highly nonlinear deformations and a simple and realistic description of the contact. The use of distributed contact forces and high order beam and plate elements based on the absolute nodal coordinate formulation are applied to the modeling of the belt-drives in two- and three-dimensional cases. According to the numerical results, a realistic behavior of the belt-drives can be obtained with a significantly smaller number of elements and degrees of freedom in comparison to the previously published finite element models of belt-drives. The results of theexamples demonstrate the functionality and suitability of the absolute nodal coordinate formulation for the computationally efficient and realistic modeling ofbelt-drives. This study also introduces an approach to avoid the problems related to the use of the continuum mechanics approach in the definition of elastic forces on the absolute nodal coordinate formulation. This approach is applied to a new computationally efficient two-dimensional shear deformable beam element based on the absolute nodal coordinate formulation. The proposed beam element uses a linear displacement field neglecting higher-order terms and a reduced number of nodal coordinates, which leads to fewer degrees of freedom in a finite element.

2014 Ukraine crisis – Implications for corporate crisis management

In the late year 2013 events started to unfold in Ukraine’s capital city Kiev that would change the political and economic environment of the EU and Russia. The tension had been building for years between the two parties with Ukraine in the middle and during 2014 the tension blew up and events started to escalate into a crisis, which we now know as the 2014 Ukraine crisis. The crisis would include political, economic, and even military actions by all the parties involved with Ukraine slipping close to civil war. Both political and economic hardships followed for others as well with both the EU and Russia placing heavy political and economic sanctions on each other. Most notably in terms of this paper, the Russian federation placed total import embargo sanctions on food imports from the EU and some other countries. This meant that a Finnish dairy company, Valio, had to engage in corporate crisis management as almost a fifth of its total revenue was cut in a heartbeat. Valio had been prepared for some kind of complications with their Russian market as events started to unfold in Ukraine in the beginning of 2014 but never did they suspect that a complete shutdown of the Russian market would follow. The company is still recovering after more than a year after the sanctions were posed and have not been able to supplement the lost revenue streams. This research is a qualitative research aiming to find answers to the main questions: 1) What is the 2014 Ukraine crisis and what kind of special implications does it have and 2) How did the crisis affect Valio and how did Valio fare in its crisis management efforts. The data has been collected both from secondary document sources and primary sources. The main findings of this research are that the political and economic environment of the EU and Russia has gone through a profound change during the years 2013-2015. The companies and governments should re-evaluate what kind of environment they are now facing and what kinds of risks the new situation poses. This also calls for a deep academic analysis from the academic community. In corporate crisis management of Valio the main findings are that the former literature has looked into crisis management as one-time occurrence but the new crises and global events would call for a more on-going crisis analysis and active crisis management. Thus, corporate crisis management should be viewed as a cycle. Valio specifically handled the situation surprisingly well, considering that their revenue was indeed cut by a fifth. The main aspects of crisis management, which Valio did not handle as well, concern the learning curve of crisis management. They could be doing more in order to prepare for future crises better by learning from this experience. The situation is then still on-going in the autumn 2015 both in Ukraine and within Valio.

2014 Ukraine crisis – Implications for corporate crisis management

In the late year 2013 events started to unfold in Ukraine’s capital city Kiev that would change the political and economic environment of the EU and Russia. The tension had been building for years between the two parties with Ukraine in the middle and during 2014 the tension blew up and events started to escalate into a crisis, which we now know as the 2014 Ukraine crisis. The crisis would include political, economic, and even military actions by all the parties involved with Ukraine slipping close to civil war. Both political and economic hardships followed for others as well with both the EU and Russia placing heavy political and economic sanctions on each other. Most notably in terms of this paper, the Russian federation placed total import embargo sanctions on food imports from the EU and some other countries. This meant that a Finnish dairy company, Valio, had to engage in corporate crisis management as almost a fifth of its total revenue was cut in a heartbeat. Valio had been prepared for some kind of complications with their Russian market as events started to unfold in Ukraine in the beginning of 2014 but never did they suspect that a complete shutdown of the Russian market would follow. The company is still recovering after more than a year after the sanctions were posed and have not been able to supplement the lost revenue streams. This research is a qualitative research aiming to find answers to the main questions: 1) What is the 2014 Ukraine crisis and what kind of special implications does it have and 2) How did the crisis affect Valio and how did Valio fare in its crisis management efforts. The data has been collected both from secondary document sources and primary sources. The main findings of this research are that the political and economic environment of the EU and Russia has gone through a profound change during the years 2013-2015. The companies and governments should re-evaluate what kind of environment they are now facing and what kinds of risks the new situation poses. This also calls for a deep academic analysis from the academic community. In corporate crisis management of Valio the main findings are that the former literature has looked into crisis management as one-time occurrence but the new crises and global events would call for a more on-going crisis analysis and active crisis management. Thus, corporate crisis management should be viewed as a cycle. Valio specifically handled the situation surprisingly well, considering that their revenue was indeed cut by a fifth. The main aspects of crisis management, which Valio did not handle as well, concern the learning curve of crisis management. They could be doing more in order to prepare for future crises better by learning from this experience. The situation is then still on-going in the autumn 2015 both in Ukraine and within Valio.

Enhancing the Dexterity of a Robot Hand Using Controlled Slip

Humans can effortlessly manipulate objects in their hands, dexterously sliding and twisting them within their grasp. Robots, however, have none of these capabilities, they simply grasp objects rigidly in their end effectors. To investigate this common form of human manipulation, an analysis of controlled slipping of a grasped object within a robot hand was performed. The Salisbury robot hand demonstrated many of these controlled slipping techniques, illustrating many results of this analysis. First, the possible slipping motions were found as a function of the location, orientation, and types of contact between the hand and object. Second, for a given grasp, the contact types were determined as a function of the grasping force and the external forces on the object. Finally, by changing the grasping force, the robot modified the constraints on the object and affect controlled slipping slipping motions.