196,566 research outputs found
St Stanojevic, Narodna Enciklopedija srpsko-hrvatsko-slovenacka, t. I et II (A-M)
No full textSalaville Sévérien. St Stanojevic, Narodna Enciklopedija srpsko-hrvatsko-slovenacka, t. I et II (A-M). In: Échos d'Orient, tome 28, n°154, 1929. pp. 252-254
Convergence and integrability of trigonometric series with coefficients of bounded variation of order (𝑚,𝑝)
No full textLet
{
c
(
n
)
}
\{ c(n)\}
be a complex null sequence such that for some integer
m
≥
1
m \geq 1
and some
p
∈
(
1
,
2
]
p \in (1,2]
∑
|
n
|
>
∞
|
Δ
m
c
(
n
)
|
p
>
∞
and
∑
n
=
1
∞
|
Δ
(
c
(
n
)
−
c
(
−
n
)
)
|
lg
n
>
∞
.
\sum \limits _{|n| > \infty } {|{\Delta ^m}c(n){|^p} > \infty \quad {\text {and}}\quad \sum \limits _{n = 1}^\infty {|\Delta (c(n) - c( - n))|\lg n > \infty .} }
It is shown that the series
(
∗
)
∑
|
n
|
>
∞
c
(
n
)
e
int
,
t
∈
T
=
R
2
π
Z
( * )\quad \sum \limits _{|n| > \infty } {c(n)} {e^{\operatorname {int} }},\quad t \in T = \frac {\mathbb {R}}{{2\pi \mathbb {Z}}}
converges a.e. and that the well-known condition
C
w
{C_w}
of J. W. Garrett and C. V. Stanojevic [4, 3] implies that the series (*) is the Fourier series of its sum. This generalizes results of W. O. Bray and C. V. Stanojevic [1]. An important consequence of the main result is that
n
Δ
c
(
n
)
=
0
(
1
)
,
|
n
|
→
∞
n\Delta c(n) = 0(1),\quad |n| \to \infty
, implies that the condition
C
w
{C_w}
is equivalent to the de la Vallee Poussin summability of partial sums
{
S
n
(
c
)
}
\{ {S_n}(c)\}
as conjectured in [8].</p
Combining additive manufacturing and vacuum casting for an efficient manufacturing of safety glasses
No full textThis paper presents the possibility of integration of modern techniques of
additive manufacturing and vacuum casting in the rapid manufacturing of
complex parts. The prototype of safety glasses was directly developed from
a CAD model, which is used as a main model for making moulds in a
vacuum casting process. The development stages, which include additive
production of glasses and the process of vacuum casting with the definition
of material components, preheating temperature, the forming of silicone
mould, the casting process, hardening and other parameters are presented
in this paper. It is proved that by using this technique it is possible to
produce complex functional parts quickly, with high precision, accuracy
and surface quality, while significantly reducing costs of development and
production compared to other similar Technologies
Implemenation of FEM and rapid prototyping in maxillofacial surgery
No full textThis paper investigates the opportunity of implementing FE simulations and rapid prototyping tecniques on titanium implant in maxillofacial surgery case based on osteotomy. Maxilla region was recorded by Cone Beam CT with high resolution and optimal radiation. Then, it followed the medical image reconstruction into 3D voxelized model. This model was converted both, to stl surface model for rapid prototyping, CAD modeling and FE mesh for simulation purposes with keeping good volume and dimensional consistency. Stl meshed surface was imported into CAD software, as initial 3d structure, which is used for parametric and customized design of implant. Since, the osteotomy is final application, it wassimulated the cutting and shifting of maxilla for proper correction by digital prototyping. Then, the fixation points for shifted maxilla were determined by surgeon to provide steady and tight joints between implanting screws and maxilla. Applied implant was given in initial standard flat configuration. Flat implant configuration was adapted by complex 3D bending in CAD software to be customized towards surface conformity of maxillofacial anatomy. By FE simulation in MSC Patran/Nastran, it was performed the stress analysis of implant with different thickness configurations and 3D bending, which provides the optimized implant model with best fit dimensions. Optimized implant model and corresponding body model were converted into physical models. RP model of maxilla was post-processed by cutting and boring to provide an adequate implant positioning according to digital prototypes. This approach facilitated the preparation of complex shaped implants in swept and lofted form, what had to be in high degree of conformity to anatomy surface. To approve a good practical opportunity, it was applied and tested in concrete surgery case of maxillofacial osteotomy
Comparing the accuracy of professional and consumer grade 3D printers in complex models production
No full textThis study aims at comparing the accuracy offered by professional and consumer grade 3D printing machines, inside a Fused Deposition Modelling (FDM) process of Additive Manufacturing (AM), in the realisation of complex models. It intends to verify, using an experimentally based approach, how much these two groups of 3D printers differ in terms of achieving complex geometry, surface quality and dimensional stability of additive models. Two consumer grade and professional 3D printers were selected and used for creating a complex model. Limits and benefits provided by each of them in engineering terms were investigated and reported. A religious building was used as a complex model, created by both 3D printers, scanned by reverse engineering technology, then processed by a software package for image processing. In this way, a comparison in models' accuracy was achieved. Results, graphically represented, show some notable differences between 3D printers in terms of accuracy and applicability. They also permit to make recommendations on practical usability of this technology
Sustainable small batch reproduction via additive manufacturing and vacuum casting: The case study of a rhinoceros toy figure
No full textThis paper aims at clarifying the relationship between two unconventional manufacturing processes, the additive manufacturing and the vacuum casting, as a sustainable way in developing prototypes and small batches, even in the presence of complex geometries. The rapid reproduction of a rhinoceros toy figure was used as case study. Starting from the 3D CAD model, acquired by reverse engineering techniques, additive manufacturing and vacuum casting processes permitted to realize its replicas. Complex functional parts in small series were manufactured with high precision, accuracy and enhanced surface finish. Furthermore, significant reductions in time and costs, both for development or production comparing to other technologies were highlighted
Introduction in production technologies
No full textIntroduction in Production Technology presents content as: Selection of Economical Production Technology; Technology of the Primer Processing and Forming; Metal Forming Technology; Metal Cutting Technology; Technology of Joining; Technology of metal heat treatments; Technology of surface protection; Processing of plastic materials; Ceramic Technology; Wood Processing Technology; Technology of semiconductors; Rapid Prototyping and Rapid Tooling; Technology of Recycling; Technology of Stone; Technology of Composite materials
The complexity of relocation and the diversity of trade union responses: efficiency-oriented foreign direct investment in central Europe
No full textRelocations within an enlarged Europe are often portrayed as an unavoidable destiny or irresistible threat for workers. The article outlines a number of contingent factors which determine how serious are the threats and how feasible is an effective union response. Such factors are then tested through in-depth case studies of 12 plants in the automotive components sector (where cross-border competition is particularly strong), showing how varied can be the scenarios for industrial relations in multinational companies
Varieties of multinationals: adapting employment practices in central eastern Europe
No full text"Home-country effects" on multinational companies' practices abroad are assessed by comparing twelve German- and U.S.-owned plants within the same sector in the "institutionally permissive" Poland, Hungary, and Slovenia. Differences are detected on functional flexibility, corporate culture and working time, but not on participation. Work organization seems more integral to national productive models than industrial relations. Moreover, considerable intramodel variation reflects product- and labor-market contingencies. The results support the interpretation of national models as internally heterogeneous and dynamic
Dr. Duane M. Jackson, Morehouse College, July 2011
No full textThis video is a conversation with Dr. Duane M. Jackson. Dr. Jackson talks about his paper, "Recall and the Serial Position Effect: The Role of Primacy and Recency on Accounting Students' Performance." Jackie Daniel, AUC Woodruff Library, is the interviewer
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