scholarly journals The optimization of a hydroformed tube

2019 ◽  
Vol 286 ◽  
pp. 04001
Author(s):  
Nassraoui Mohammed ◽  
Radi Bouchaib

The shaping by hydroforming process involves several complex phenomena and presents several types of nonlinearities (geometric, material,...). The development of a hydroforming operation requires a lot of testing to determine with precision the optimum loads of trips and get a room without defects. Advances in digital tools have enabled manufacturers to simulate and optimize their production facilities before launching the production in order to minimize the maximum rate of defective parts.

Author(s):  
Martin Hagopian ◽  
Michael D. Gershon ◽  
Eladio A. Nunez

The ability of cardiac tissues to take up norepinephrine from an external medium is well known. Two mechanisms, called Uptake and Uptake respectively by Iversen have been differentiated. Uptake is a high affinity system associated with adrenergic neuronal elements. Uptake is a low affinity system, with a higher maximum rate than that of Uptake. Uptake has been associated with extraneuronal tissues such as cardiac muscle, fibroblasts or vascular smooth muscle. At low perfusion concentrations of norepinephrine most of the amine taken up by Uptake is metabolized. In order to study the localization of sites of norepinephrine storage following its uptake in the active bat heart, tritiated norepinephrine (2.5 mCi; 0.064 mg) was given intravenously to 2 bats. Monoamine oxidase had been inhibited with pheniprazine (10 mg/kg) one hour previously to decrease metabolism of norepinephrine.


Author(s):  
M.G. Baldini ◽  
S. Morinaga ◽  
D. Minasian ◽  
R. Feder ◽  
D. Sayre ◽  
...  

Contact X-ray imaging is presently developing as an important imaging technique in cell biology. Our recent studies on human platelets have demonstrated that the cytoskeleton of these cells contains photondense structures which can preferentially be imaged by soft X-ray imaging. Our present research has dealt with platelet activation, i.e., the complex phenomena which precede platelet appregation and are associated with profound changes in platelet cytoskeleton. Human platelets suspended in plasma were used. Whole cell mounts were fixed and dehydrated, then exposed to a stationary source of soft X-rays as previously described. Developed replicas and respective grids were studied by scanning electron microscopy (SEM).


1984 ◽  
Vol 52 (01) ◽  
pp. 015-018 ◽  
Author(s):  
A Girolami ◽  
A Sticchi ◽  
R Melizzi ◽  
L Saggin ◽  
G Ruzza

SummaryLaser nephelometry is a technique which allows the evaluation of the concentration of several serum proteins and clotting factors. By means of this technique it is also possible to study the kinetics of the reaction between antigen and antibody. We studied the kinetics of the reaction between prothrombin and an antiprothrombin antiserum using several prothrombins namely: Prothrombin Padua, prothrombin Molise, which are two congenital dysprothrombinemias, cirrhotic, coumarin or normal prothrombins. Different behaviors in the kinetics of the reactions were shown even when the concentration of prothrombins was about the same in all plasma tested. These differences were analyzed by means of a computer (Apple II 48 RAM) programmed to solve four unknown equations (Rodbard’s equation). From the data so obtained one can see that when voltages at the beginning and at the end of the reaction are in all cases about the same, a clear difference in the time required to reach half the maximum value of the voltage can still be demonstrated. This parameter, which is expressed in minutes, is longer in coumarin and prothrombin Molise than in controls. On the contrary it is shorter in prothrombin Padua and has about the same value of controls in the cirrhotic patient. Moreover the time at which the maximum rate is obtained is longer in coumarin and prothrombin Molise than in controls and shorter in liver cirrhosis and prothrombin Padua. In conclusion data obtained show that coumarin prothrombin behaves in a different way from cirrhotic prothrombin and also that there is a different behaviour between the two congenital dysprothrombinemias.


2017 ◽  
Vol 11 (1) ◽  
pp. 39-54 ◽  
Author(s):  
Jeremy M. Mikecz

Ethnohistorians and other scholars have long noted how European colonial texts often concealed the presence and participation of indigenous peoples in New World conquests. This scholarship has examined how European sources (both texts and maps) have denied indigenous history, omitted indigenous presence, elided indigenous agency, and ignored indigenous spaces all while exaggerating their own power and importance. These works provide examples of colonial authors performing these erasures, often as a means to dispossess. What they lack, however, is a systematic means of identifying, locating, and measuring these silences in space and time. This article proposes a spatial history methodology which can make visible, as well as measurable and quantifiable the ways in which indigenous people and spaces have been erased by colonial narratives. It presents two methods for doing this. First, narrative analysis and geovisualization are used to deconstruct the imperial histories found in colonial European sources. Second it combines text with maps to tell a new (spatial) narrative of conquest. This new narrative reconstructs indigenous activity through a variety of digital maps, including ‘mood maps’, indigenous activity maps, and maps of indigenous aid. The resulting spatial narrative shows the Spanish conquest of Peru was never inevitable and was dependent on the constant aid of immense numbers of indigenous people.


Author(s):  
Maria Enescu ◽  
Marian Enescu

Customer experience maturity of any organization is important for its business results. This paper describes two kinds of maturity models, one based on competency evaluation of the employees on customer’s best applied practices, and the second on maturity of using digital tools to increase the customer good experience when working with the company. These approaches are useful when discuss the performance of enterprises providing products or services in the age of customer. The included case studies show the applicability of the procedures and open a way to be extended for proficiency testing workshops (for similar business) or in ranking the enterprises from the viewpoint of customer experience maturity.


Author(s):  
Yu.F. Karabanov ◽  
◽  
A.S. Pecherkin ◽  
V.A. Tkachenko ◽  
V.I. Sidorov ◽  
...  

Author(s):  
A.I. Grazhdankin ◽  
◽  
A.S. Pecherkin ◽  
E.A. Samuseva ◽  
N.L. Razumnyak ◽  
...  

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