bluuebunny/crossref_metadata_2025 huggingface dataset:
Level of knowledge about sexually transmitted infections in the population of female students at the University of Novi Sad
Authors: Nikolic Svetlana , Kapamadzija Aleksandra
Published: April 2011

Introduction. The reason for extremely high incidence of sexually transmitted
infections is the lack of necessary knowledge about the mode of transmission
and protection measures. The aim of this study was to determine the level of
knowledge about sexually transmitted infections in the population of female
students of the University of Novi Sad. Material and methods. The study
included 397 female students at the University of Novi Sad from different
faculties. A questionnaire was designed for the purpose of this research.
Results and discussion. Students from all faculties (55.7-66.7%), with the
exception of the medical students, believe that the use of condoms is the
safest way of protection from sexually transmitted infections. The medical
students showed a different attitude and opinion on the use of condoms and
avoidance of multiple sexual partners, which are important measures in the
prevention of these diseases (38. 8%). The fact that some sexually
transmitted infections caused by viruses are associated with the malignancy
of the cervix was recognized by 74.81% of students. The fact that the main
therapeutic approach for treatment of sexually transmitted diseases is the
simultaneous treatment of both partners was known by 81.86% of female
students. As it is known, sexually transmitted infections may not always be
symptomatic, which is an opinion held by 73.55% of students. Conclusion.
Results obtained in this study indicate the need for implementation of
educational activities about sexually transmitted infections, which would
enable the preservation and promotion of reproductive health of young people.
Mixed malignant germ cell tumor of ovary
Authors: Sviracevic Branko , Sedlar Srdjan , Malobabic Dragan , Cuk Dragomir
Published: April 2011

Introduction. Malignant tumours of ovary germ epithelium are very rare and
account for about 2-5% of all ovarian tumours of germ origin. In adolescent
patients under 20 years of age diagnosed to have ovarian tumour, these
tumours originate from germ cells in about 70% of cases. Depending on the
stage of the disease, medical treatment and age, the death rate ranges from
25% to 84%. A special group of germ tumours are mixed germ cells tumours
built of two or more different types of germ tumours. Case report. This paper
gives a diagnostic-therapeutic procedure and the clinical picture with the
course and outcome of the decease in a nineteen-year old patient with a mixed
malignant germ tumour (dysgerminoma, choriocarcinoma, immature teratoma)
found in one of the ovaries. It also deals with the appearance and
development, some characteristics and histological build of the tumours
diagnosed in this case. Conclusion. Malignant tumours of ovary germ
epithelium are very rare and develop in female population under 30 years of
age. They are characterized by a high degree of malignity. They are resistant
to cytostatic treatment, they spread very quickly with the lethal outcome.
The course of the disease is not characteristic and is usually masked under
some other acute gynaecological disease. The definitive diagnosis is made
after laparotomy and pathohistological analysis of the tumour tissue.
The difference between the product and the convolution product of distribution functions in Rn
Authors: Omey E. , Vesilo R.
Published: April 2011

Assume that X? and Y? are independent, nonnegative d-dimensional random
vectors with distribution function (d.f.) F(x?) and G(x?), respectively. We
are interested in estimates for the difference between the product and the
convolution product of F and G, i.e., D(x?) = F(x?)G(x?) ? F ? G(x?). Related
to D(x?) is the difference R(x?) between the tail of the convolution and the
sum of the tails: R(x?) = (1 ? F ? G(x?))?(1 ? F(x?) + 1 ? G(x?)). We
obtain asymptotic inequalities and asymptotic equalities for D(x?) and R(x?).
The results are multivariate analogues of univariate results obtained by
several authors before.
The scalar curvature of the tangent bundle of a Finsler manifold
Authors: Bejancu Aurel , Farran Reda
Published: April 2011

Let Fm = (M, F) be a Finsler manifold and G be the Sasaki-Finsler metric on
the slit tangent bundle TM0 = TM \{0} of M. We express the scalar curvature
?~ of the Riemannian manifold (TM0,G) in terms of some geometrical objects
of the Finsler manifold Fm. Then, we find necessary and sufficient
conditions for ?~ to be a positively homogenenous function of degree zero
with respect to the fiber coordinates of TM0. Finally, we obtain
characterizations of Landsberg manifolds, Berwald manifolds and Riemannian
manifolds whose ?~ satisfies the above condition.
Semi-parallel lightlike hypersurfaces of indefinite cosymplectic space forms
Authors: Upadhyay Abhitosh , Gupta Shankar
Published: April 2011

We study the semiparallel lightlike hypersurface of an indefinite
cosymplectic space forms which are tangent to the structure vector field.
On extended generalized φ-recurrent β-Kenmotsu manifolds
Authors: Absos Ali , Shyamal Kumar
Published: April 2011

We extend the notion of generalized ?-recurrent ?-Kenmotsu manifold and study
its various geometric properties with the existence of such notion.
On roots of polynomials with positive coefficients
Authors: Zaïmi Toufik
Published: April 2011

Let ? be an algebraic number with no nonnegative conjugates over the field of
the rationals. Settling a recent conjecture of Kuba, Dubickas proved that the
number ? is a root of a polynomial, say P, with positive rational
coefficients. We give in this note an upper bound for the degree of P in
terms of the discriminant, the degree and the Mahler measure of ?; this
answers a question of Dubickas.
On super quasi Einstein manifold
Authors: Debnath Pratyay , Konar Arabinda
Published: April 2011

We study super quasi Einstein manifold and viscous fluid super quasi Einstein
spacetime. The existence of super quasi Einstein manifold and viscous fluid
super quasi Einstein spacetime are shown by two closely related examples.
Also, some results involving super quasi Einstein manifold, pseudo quasi
Einstein manifold and quasi Einstein manifold are established. Finally, the
bounds of the cosmological constant in a viscous fluid super quasi Einstein
spacetime are deduced.
Nucleation of biomimetic hydroxyapatite
Authors: Colovic Bozana , Markovic Dejan , Jokanovic Vukoman
Published: April 2011

Introduction. The aim of the study was to assess the formation of biomimetic
calcium hydroxyapatite (HAP) on the surface of different substrates. Material
and Methods. Silica coated stainless steel tapes and thin polymer films
(alginate, cellulose, poly lactide-co-glycolide - PLGA) deposited on
hydroxyapatite scaffold were used as substrate. Supersaturated simulated body
fluid (SBF) and SBF combined with Fetal Calf Serum (FCS) or Eagle?s Minimum
Essential Medium (EMEM) were used as bioactive liquid medium where biomimetic
nucleation of HAP occurred. Infrared spectroscopy with Fourier transformation
was used to analyze the formed phases, while scanning electron microscopy
indicated the morphology of nucleated phase. Results. The results of
measuring the mass with volume adjustments done by the BET method showed that
the thickness of the film of nucleated calcium hydroxyapatite depended on
the time that samples spent soaked in SBF-in as well as the type of selected
biomimetic medium. Conclusion. Biomimetic calcium hydroxyapatite is possible
to produce by self nucleation on different substrates in the presence of
simulating body fluid.
Calcium phosphate crystal forms in human jaw bones of changed osteoporotic structure
Authors: Postic Srdjan
Published: April 2011

Introduction. Calcium phosphates are chemical compounds that can be found in
various forms within nature, as well as in human jaws and bones. The aim of
this study was to assess the structure of solid chemical compounds which form
the structure of normal and osteoporotic jaw-bones. Materials and Methods.
The jaw-bones taken from human cadavers were used in the study.
Crystalographic forms of calcium phosphate, in the samples of human jaw-bone,
were determined using X-ray diffraction technique. The experimental bone
samples originated from osteoporotic jaw-bone of cadavers while control
samples were taken from dentate jaw-bones of non-osteoporotic cadavers.
Results. The results of this study showed that hydroxyapatite was the only
phase determined in control non-osteoporotic bone samples. In experimental
(osteoporotic) bone samples, the same phase was registered, as well as
calcium monophosphate and hydrated calcium phosphate, registered as
increments of values on ? axis. Conclusion. Hydroxyapatite was the only
compound detected in normal bone while osteoporotic bone contained others
crystallographic forms of calcium phosphates.
Evaluation of sealing ability of chemically softened gutta-percha technique
Authors: Arbutina Radmila , Djeri Aleksandra , Gajic Natasa , Trnic Zorica , Trtic Natasa
Published: April 2011

Introduction. Obturation of the root canal is the final phase of endodontic
therapy and it is usually used to assess the quality of endodontic treatment.
The objective of this study was to examine the quality of apical sealing of
the root canal after application of chemically softened gutta-percha.
Material and Methods. Thirty extracted single rooted and multi rooted teeth,
divided into two groups according to the material for obturation, were used
in the study. After root canal instrumentation using step-back technique,
obturation was completed using chemically softened gutta-percha and AH Plus
and Apexit paste. The effect of apical sealing was assessed regarding the
type of material used for the obturation. After obturation, teeth were coated
with two coats of varnish and immersed in 50% solution of silver nitrate for
twelve hours, and then longitudinally cut using diamond disc. Linear dye
penetration was observed using light microscope and twenty five times
magnification. The apical leakage was calculated using the measuring scale,
previously mounted on microscope lens. Results. The results showed that the
average penetration of silver nitrate in single rooted teeth obturated with
the AH Plus paste was 132.8 ?m, while in teeth obturated with Apexit, it was
148.6 ?m. The difference was not statistically significant. Apical leakage in
multi rooted teeth obturated with softened gutta-percha and AH Plus paste was
117.3 ?m while in teeth obturated with Apexit, it was 158.5 ?m. The
difference was statistically significant. Conclusion. The lowest dye
penetration in the apical portion of the canal was observed in multi rooted
teeth obturated with AH Plus paste and the highest penetration of silver
nitrate was in multi rooted teeth obturated with Apexit paste.
Quality management in dental health care: Present and future development
Authors: Tekic Jasmina , Majstorovic Vidosav , Markovic Dejan , Nikodijevic Angelina , Stamenkovic Dragoslav
Published: April 2011

The standards ISO 9000 series, brought in 1987, were the driving force for
the development and application of quality management (QM) in various areas,
including health care. Currently, there are over one million certificates for
quality management (QMC), and they were main initiators of quality
improvement. In addition to the model for quality management of
products/services, other models are also in use. The aim of this study was to
present methods and techniques for quality improvement of health services,
with special emphasis on dental health care services (DHS), and possibility
for enhancement.
Water storage reservoirs and their role in the development, utilization and protection of catchment
Authors: Djordjevic Branislav , Dasic Tina
Published: April 2011

Reasons why water storage reservoirs are necessary in accordance with the
sustainable development strategy are described in the paper. The main
positive and negative impacts of reservoirs on the environment are analyzed.
The most important are: the improvement of hydrological regimes (decreasing
maximal and increasing minimal flows), the creation of optimal water
management, utilization and protection of water, and the creation of better
conditions for river and coastal ecosystems. Negative impacts and measures
for its mitigation or elimination are also analyzed. The conclusion is that
water storage reservoirs can be harmoniously incorporated into the
environment. Serbia has a limited number of locations suitable for the
construction of reservoirs, therefore it is necessary to retain these areas
for storage in regional development plans and other legal acts.
Sustainable water supply systems in India: The role of financial institutions and ethical perspective
Authors: Gowda Krishne , Doddaswamy Ravishankar
Published: April 2011

Water is a scarce resource and an important basic necessity for the human
survival. The quantity of potable water on earth is limited and its
availability per person is reducing day by day due to increase in global
population and damage to environment. Though water available in nature is
free, sizeable investment is needed in order to supply water to the people at
their doorsteps with required quality. This paper deals with the role of
financial institutions in the balanced distribution of water for the public,
the related problems with various regulatory instruments, and ethical
perspectives for efficient utilization of this scarce resource through
internal control aimed at long term sustainability.
National indicators for evaluating the outcome of reinventing spatial planning in Serbia
Authors: Dzelebdzic Omiljena , Bazik Dragana
Published: April 2011

This paper is a follow-up to a research in the domain of theorizing planning
practice and practising spatial planning theoretical approaches in the
context of information-isation, globalisation and EU-isation. The theoretical
framework contemplates the meaning of the spatial concept that is grounded in
the duality of the information phenomenon and contemporary expression of the
space notion, as a way of reinventing spatial planning. The operational
framework discuses the spatial planning practice in Serbia through a brief
explanation of applied methodology for identifying a suitable indicator set
proposed for the implementation monitoring of the Spatial Plan of the
Republic of Serbia 2010-2020. The national indicators set represents a
theoretical model of knowledge for evaluating relational outcomes of spatial
development complexity, and its spatial-temporal character represents a way
of practising theoretical approaches as monitoring tools for spatial planning
within the limits of the present regulatory system in Serbia.
Description of the new member states transport system in an era of convergence: Development of an indicator system
Authors: Gavanas Nikolaos , Pitsiava Magda
Published: April 2011

The recent enlargement of the European Union (EU) towards East Europe and the
Balkans provides a common policy framework towards the promotion of
socio-economic convergence of the 12 new member-states to the EU emphasizing
the role of the transportation system. A system of indicators is developed in
this paper in order to describe the new member-states? transportation system
in relation to the area?s socio-economic characteristics by comparing them to
the transportation and socio-economic profile of the 15 pre-enlargement
member-states. The analysis indicates relatively low levels of mobility for
the study area combined with social and economic disparities. It also
highlights a series of prospects that could contribute decisively towards the
achievement of socio-economic convergence. Based on the experience gained by
the development and application of the indicator system, the paper concludes
with a series of propositions in order to enhance its contribution for the
description of the features and the assessment of the impacts from the
development of the new member-states? transport system.
Modelling the spatial distribution of Vojvodina’s population by using dasymetric method
Authors: Krunic Nikola , Bajat Branislav , Kilibarda Milan , Tosic Dragutin
Published: April 2011

Cartographic presentation of heterogeneity/homogeneity in the spatial
distribution of population is still a major problem in modern geography, and
other geo-sciences as well. The traditional method of thematic or choropleth
mapping rarely gives satisfactory results. This paper analyzes the
applicability of dasymetric mapping method for the modelling of spatial
distribution of population. Although it is a relatively old method, it
becomes widely used following the development of computer technology, GIS
and satellite imagery, and its applicability is increasing in social,
economic and other sciences and disciplines. After showing the basis and
development of dasymetric mapping, the authors present possible application
of this method in the population distribution modelling of Vojvodina.
Impacts of traditional architecture on the use of wood as an element of facade covering in Serbian contemporary architecture
Authors: Ivanovic-Sekularac Jelena , Sekularac Nenad
Published: April 2011

The world trend of re-use of wood and wood products as materials for
construction and covering of architectural structures is present not only
because of the need to meet the aesthetic, artistic and formal requirements
or to seek inspiration in the return to the tradition and nature, but also
because of its ecological, economic and energetic feasibility. Furthermore,
the use of wood fits into contemporary trends of sustainable development and
application of modern technical and technological solutions in the production
of materials, in order to maintain a connection to nature, environment and
tradition. In this study the author focuses on wood and wood products as an
element of facade covering on buildings in our country, in order to extend
knowledge about possibilities and limitations of their use and create a base
for their greater and correct application. The subject of this research is to
examine the application of wood and wood products as an element covering the
exterior in combination with other materials applied in our traditional and
contemporary homes with the emphasis on functional, representational art and
the various possibilities of wood. In this study all the factors that affect
the application of wood and wood products have been analyzed and the
conclusions have been drawn about the manner of their implementation and the
types of wood and wood products protection. The development of modern
technological solutions in wood processing led to the production of composite
materials based on wood that are highly resistant, stable and much longer
lasting than wood. Those materials have maintained in an aesthetic sense all
the characteristics of wood that make it unique and inimitable. This is why
modern facade coating based on wood should be applied as a facade covering in
the exterior of modern architectural buildings in Serbia, and the use wood
reduced to a minimum.
Foreign direct investment impact on environment in Serbia in the period 2000-2008
Authors: Simeuncevic Sanja
Published: April 2011

Foreign direct investment (FDI) is currently the largest source of capital
reaching developing countries and a stimulant to economic growth. Although
FDI benefits the economy of the ?host? country, its impact on the environment
can vary from pure exploitation of slack environmental regulations and the
creation of ?pollution havens?, environmental political ?chilling? effect, to
the transfer of new clean technologies and the formation of ?pollution
haloes?. This paper focuses on FDI environmental impact in Serbia, in the
period from the opening of the borders to foreign capital in 2000 until 2008,
when the FDI in Serbia drastically decreased. The FDI growth of 65 times in
the period of five years emphasizes the relevance of this analysis, if
sustainable development is to be achieved. This paper envisages FDI impact
and visible actual tendencies on Serbian environment, and defines to which of
the theoretical concepts it could be arranged. The paper explores whether FDI
influence in Serbia resulted in a dominant transfer of pollution intensive
industries or a transfer of environmentally friendly technology and know-how,
in reducing or improving environmental regulations in Serbia.
The role of human papillomavirus typization and cytology in early detection of relapse of cervical intraepithelial neoplasia
Authors: Zivadinovic Radomir , Lilic Vekoslav , Djordjevic Biljana , Stanojevic Zorica , Petric Aleksandra , Lilic Goran
Published: April 2011

Background/Aim. Female patients who underwent ceratin treatment forms of
cervical intraepithelial neoplasia (CIN) are at five times greater risk for
disease relapse in comparison to the rest of female population. The aim of
the study was to investigate validity of human papillomavirus (HPV)
typization and cytology in detection of relapse. Methods. The prospective
clinical investigation included 35 patients with relapse and 30 ones without
it after adequate treatment of cervical intraepithelial neoplasia. HPV
typization using PCR methods and cytological test (conventional Pap smear)
were performed in all the patients. Validation of tests applied was performed
by determining their sensitivity, specificity, and positive and negative
predictive value. Results. More severe degrees of CIN relapse occur
significantly more often in patients which remain HPV positive despite of the
treatment. The patients which remain positive on HPV type 18 or, on both HPV
types 18 and 16, have more often CIN relapses of more severe degree in
relation to those just positive on HPV type 16. HPV typization has higher
predictive value for diagnosis of the rezidual disease in older patients.
Sensitivity of HPV typization for diagnosis all CIN relapse degrees is
68.57%, for more severe degrees (HSIL and MIC) 90.47%, specificity is 93.33%,
while positive and negative predictive values are 90.47% and 93.53%,
respectively. Sensitivity of cytology for diagnosis of more severe CIN
relapses is 80.95%. HPV typization used along with cytology ofters the
highest sensitivity (95.23%). Conclusion. Both tests, HPV typization and Pap
smear, offer satisfactory sensitivity and high specificity in detection of
relapse, parcticularly those with more severe degree. The highest sensitivity
in detection of CIN relapse is obtained by using both tests.
Significance of magnetic resonance imaging in differential diagnosis of nontraumatic brachial plexopathy
Authors: Peric Stojan , Lavrnic Slobodan , Basta Ivana , Damjanovic Dusan , Stosic-Opincal Tatjana , Lavrnic Dragana
Published: April 2011

Background/Aim. Nontraumatic brachial plexopathies may be caused by primary
or secondary tumors, radiation or inflammation. The aim of this study was to
present the significance of MRI in revealing the cause of nontraumatic
brachial plexopathy. Methods. A two-year retrospective study included 22
patients with nontraumatic brachial plexopathy. In all the patients typical
clinical findings were confirmed by upper limb neurophysiological studies. In
all of them MRI of brachial plexus was performed by 1.5 T scanner in T1 and
T1 FS sequence with and without contrast, as well as in T2 and T2 FS
sequences. Results. Seven (32%) patients had brachial plexopathy with signs
of inflammatory process, 5 (23%) patients had secondary tumors, in 4 (18%)
patients multifocal motor neuropathy was established and in the same number
(18%) of the patients postradiation fibrosis was found. Two patients (9%) had
primary neurogenic tumors. Conclusion. According to the results of this study
MRI is a method which may determine localization and cause of brachial
plexopathy. MRI can detect focal nerve lesions when other methods fail to
find them. Thus, MRI has a direct impact on further diagnostic and
therapeutical procedures.
Optical metrology analysis of the lower jaw deformations
Authors: Tanasic Ivan , Tihacek-Sojic Ljiljana , Milic-Lemic Aleksandra
Published: April 2011

Background/Aim. New optical stereometric methods based on both contact and
noncontact mechanisms for displacement measurement have become common methods
in biomechanical behavior research of biomaterials, bone and soft tissue. The
aim of this study was to register and measure possible deformations of the
lower jaw (mandible) with the intact dental arch using optical metrology
method. Methods. The system for full field measurement of deformations
(strains) comprised of two digital cameras for a synchronized stereoview of
the specimen, and the Aramis software. Results. The maximum mandibular bone
strains were measured in the regions of the lower first premolar and the
lower second molar. In the action force of 500 N simulated in the region of
the first lower premolar the intensity of deformation was 86 ?m. The value of
maximum strain in the bone around the molars was 24 ?m for the force of 500 N
acting on the second lower molar. When it comes to premolars, 3-5 times
stronger deformation was observed in the region of the first lower premolar,
compared to the deformation values of the second lower premolar area.
Conclusion. Under loading of the applied forces the measured strains were in
the elastic deformation area, meanning that the dependence of force and
deformity is linear. The highest values of strain measurements obtained by
the optical method were found in the jaw bone tissue around the loading
teeth, and the bony regions of the triangle and mental region. According to
the obtained results from the Aramis processing software it can be concluded
that this method is applicable in a variety of biomedical research.
Cochlear implant: Speech and language development in deaf and hard of hearing children following implantation
Authors: Ostojic Sanja , Djokovic Sanja , Dimic Nadezda , Mikic Branka
Published: April 2011

Bacground/Aim. Almost 200 cochlear implantations were done in the four
centers (two in Belgrade, per one in Novi Sad and Nis) in Serbia from 2002 to
2009. Less than 10% of implantees were postlingually deaf adults. The vast
majority, i.e. 90% were pre- and perilingually profoundly deaf children. The
aim of this study was to assess the influence of improved auditory perception
due to cochlear implantation on comprehension of abstract words in children
as compared with hearing impaired children with conventional hearing aids and
normal hearing children. Methods. Thirty children were enrolled in this
study: 20 hearing impaired and 10 normal hearing. The vocabulary test was
used. Results. The overall results for the whole test (100 words) showed a
significant difference in favor of the normal hearing as compared with
hearing impaired children. The normal hearing children successfully described
or defined 77.93% of a total of 100 words. Success rate for the cochlear
implanted children was 26.87% and for the hearing impaired children with
conventional hearing aids 20.32%. Conclusion. Testing for abstract words
showed a statistically significant difference between the cochlear implanted
and the hearing impaired children with hearing aids (Mann- Whitney U-test, p
= 0.019) implying considerable advantage of cochlear implants over hearing
aids regarding successful speech development in prelingually deaf children.
Computer-aided technologies in diagnostics and therapy of impacted teeth
Authors: Mihailovic Branko , Duka Milos , Lazic Zoran , Mladenovic Dragan , Vujicic Biljana , Miladinovic Milan
Published: April 2011

nema
Bilateral Monteggia fracture in adults
Authors: Ristic Dejan , Jovanovic Nebojsa , Cvetkovic Voja , Stankovic Biljana , Vracevic Branislav
Published: April 2011

Introduction. In 1814 Giovanni Monteggia first described two cases of
fractures of the proximal third of ulna with dislocation of the radial head.
These fractures are more common in children than in adults, and mutual
Monteggia fracture is a rare complication. This study presents a treatment
course of a patient with bilateral Monteggia fracture. Case report. A 55-
year-old patient was injured by falling in the yard. Radiography showed
bilateral Monteggia fracture type II (by the Badon classification). Operative
treatment of fracture was done by a compression plate on the right side and
by the zuggurtung technique on the left one. Closed repositioning of the
radial head was done on both sides. The patient was wearing a plaster splint
for the upper arm for 21 days. After removing the fixation, the function of
the elbow was determined by the Broberg Morrey score (BM) which was on the
right side 45.5 and on the left side 47.5. After the proper physical therapy,
four months after the surgery, BM score was 100 on the right side, and 93 on
the left one. Conclusion. Surgical treatment and early rehabilitation is the
key for the return of good function of both elbows.
Preimplantation filling of tooth socket with β-tricalcium phosphate/polylactic-polyglycolic acid (β-TCP/PLGA) root analogue: clinical and histological analysis in a patient
Authors: Kokovic Vladimir , Todorovic Ljubomir
Published: April 2011

Introduction. Bone resorption is a physiological process after tooth
extraction. The use of bone substitutes to fill the tooth socket is suggested
to prevent bone resorption and establish good bone architecture for implant
placement. A pure ?-tricalcium phosphate coated with copolymer
(polylactic-polyglycolic acid) as a root analogue, is suitable for filling
tooth sockets. Case report. We presented a patient successfully treated with
root analogue after extraction of the right second lower premolar. Three
months later, the patient was planned for the placement of six TE? ITI dental
implants into the mandible. During the surgery, the biopsy of bone-like tissue
from the previously treated socket was taken. All the implants were
immediately loaded due to good primary stability. Histological analysis of
the specimen revealed fibrous healing in the area treated with root analogue.
Conclusion. The use of ?-tricalcium phosphate coated with copolymers after
tooth extraction enables satisfactory bone architecture for consequent
implant treatment.
Delayed angioedema during therapy with angiotensin-converting enzyme inhibitors
Authors: Jankovic Slobodan , Stefanovic Srdjan
Published: April 2011

Introduction. Angiotensin-converting enzyme inhibitors are leading cause of
drug-induced angioedema, with incidence of 0.1 to 0.2%. The angioedema is not
of immune nature; in predisposed individuals it is caused by accumulation of
vasoactive mediators due to reduced activity of angiotensinconverting enzyme.
Case report. We presented a 63-year old male patient suffering from
hypertension and chronic obstructive pulmonary disease, who had developed two
episodes of angioedema during a 5-year long therapy with enalapril. The first
episode happened after three, and the second after five years of the therapy.
On both occasions, the patient was admitted to the hospital and tracheotomy
was avoided in the last moment. Conclusion. Long-term therapy with
angiotensin-converting enzyme inhibitors could be associated with delayed
angioedema, especially in patients with inflammation of airways caused by
infection or chronic irritation.
Dynamics and Control of Humanoid Robots: A Geometrical Approach
Authors: Ivancevic Vladimir G. , Ivancevic Tijana T.
Published: April 2011

This paper reviews modern geometrical dynamics and control of humanoid robots. This general Lagrangian and Hamiltonian formalism starts with a proper definition of humanoid's configuration manifold, which is a set of all robot's active joint angles. Based on the ‘covariant force law’, the general humanoid's dynamics and control are developed. Autonomous Lagrangian dynamics is formulated on the associated ‘humanoid velocity phase space’, while autonomous Hamiltonian dynamics is formulated on the associated ‘humanoid momentum phase space’. Neural-like hierarchical humanoid control naturally follows this geometrical prescription. This purely rotational and autonomous dynamics and control is then generalized into the framework of modern non-autonomous biomechanics, defining the Hamiltonian fitness function. The paper concludes with several simulation examples.
Tidying and Cleaning Rooms using a Daily Assistive Robot - An Integrated System for Doing Chores in the Real World -
Authors: Yamazaki Kimitoshi , Ueda Ryohei , Nozawa Shunichi , Mori Yuto , Maki Toshiaki , Hatao Naotaka , Okada Kei , Inaba Masayuki
Published: April 2011

This paper describes a system integration of daily assistive robots. Several tasks related to cleaning and tidying up rooms are focused on. Recognition and motion generation functions were integrated onto the robot, and these provided failure detection and in some cases, its recovery. Experiments of several daily tasks handling daily tools showed the effectiveness of our system.
Non-Facial and Non-Verbal Affective Expression for Appearance-Constrained Robots Used in Victim Management*
Authors: Bethel Cindy L. , Murphy Robin R.
Published: April 2011

Non-facial and non-verbal methods of affective expression are essential for social interaction in appearance-constrained robots such as those used in search and rescue, law enforcement, and military applications. This research identified five main methods of non-facial and non-verbal affective expression (body movements, postures, orientation, color, and sound). Based on an extensive review of literature, prescriptive design recommendations were developed for the appropriate non-facial and non-verbal affective expression methods for three proximity zones of interest (intimate, personal, and social). These design recommendations serve as guidelines to add retroactively affective expression through software with minimal or no physical modification to a robot. A large-scale, complex human-robot interaction study was conducted to validate these design recommendations using 128 participants and four methods of evaluation. The study was conducted in a high-fidelity, confined-space simulated disaster site with all robot interactions performed in the dark. Statistically significant results indicated that participants felt the robots that exhibited affective expressions were more calming, friendly, and attentive, which improved the social human-robot interactions.
Measurements of absorbed heat flux and water-side heat transfer coefficient in water wall tubes
Authors: Taler Jan , Taler Dawid , Kowal Andrzej
Published: April 2011

Measurements of absorbed heat flux and water-side heat transfer coefficient in water wall tubes

The tubular type instrument (flux tube) was developed to identify boundary conditions in water wall tubes of steam boilers. The meter is constructed from a short length of eccentric tube containing four thermocouples on the fire side below the inner and outer surfaces of the tube. The fifth thermocouple is located at the rear of the tube on the casing side of the water-wall tube. The boundary conditions on the outer and inner surfaces of the water flux-tube are determined based on temperature measurements at the interior locations. Four K-type sheathed thermocouples of 1 mm in diameter, are inserted into holes, which are parallel to the tube axis. The non-linear least squares problem is solved numerically using the Levenberg-Marquardt method. The heat transfer conditions in adjacent boiler tubes have no impact on the temperature distribution in the flux tubes.
Experimental and theoretical study of dryout in annular flow in small diameter channels
Authors: Mikielewicz Dariusz , Gliński Michał , Wajs Jan
Published: April 2011

Experimental and theoretical study of dryout in annular flow in small diameter channels

In the paper the experimental analysis of dryout in small diameter channels is presented. The investigations were carried out in vertical pipes of internal diameter equal to 1.15 mm and 2.3 mm. Low-boiling point fluids such as SES36 and R123 were examined. The modern experimental techniques were applied to record liquid film dryout on the wall, among the others the infrared camera. On the basis of experimental data an empirical correlation for predictions of critical heat flux was proposed. It shows a good agreement with experimental data within the error band of 30%. Additionally, a unique approach to liquid film dryout modeling in annular flow was presented. It led to the development of the three-equation model based on consideration of liquid mass balance in the film, a two-phase mixture in the core and gas. The results of experimental validation of the model exhibit improvement in comparison to other models from literature.
Femoral Acetabular Impingement and Osteoarthrosis in a Patient With Hip Pain
Authors: Macdonald Cameron , Mintken Paul E.
Published: April 2011

The patient was a 41-year-old man who was referred to a physical therapist with a chief complaint of right anterior hip/groin pain. The patient's symptoms started 6 months earlier after dunking a basketball and were exacerbated while moving boxes 4 months later. The patient reported morning stiffness and constant pain that was exacerbated by squatting and prolonged sitting. Right hip range of motion was limited to 85° of flexion and 0° of internal rotation with a painful “pinching” sensation noted in the groin region at end range of motion; these range-of-motion findings were consistent with a clinical diagnosis of hip osteoarthritis. Given the lack of improvement with conservative measures, the patient was referred to an orthopaedic surgeon. Radiographs revealed decreased offset of the femoral head-neck junction, greater on the right than on the left, which is suggestive of cam-type femoral acetabular impingement. Moderate degenerative osteoarthrosis of the right hip was also noted. The patient's symptoms improved for 3 weeks following a corticosteroid injection, but then returned to baseline. The patient subsequently underwent a Birmingham hip resurfacing procedure. In this patient, conservative management of his hip osteoarthritis may have been complicated by the presence of femoral acetabular impingement. J Orthop Sports Phys Ther 2011;41(3):201. doi:10.2519/jospt.2011.0406
New structural and mechanical features of hexagonal materials after room temperature extrusion using the KoBo method
Authors: Korbel Andrzej , Pospiech Jan , Bochniak Włodzimierz , Tarasek Anna , Ostachowski Pawel , Bonarski Jan
Published: April 2011

The paper presents results of investigations on texture, microstructure and mechanical properties of magnesium alloy AZ31 and pure zinc after severe plastic deformation using the KoBo extrusion method at room temperature. The KoBo method combines monotonic metal deformation with cyclic changes of deformation path. It allows realization of an extrusion ratio equal to 100 (true strain ∊ = 4.6) at room temperature using a force of less than 1 MN. At the same time the grain structure is refined to the level of a few micrometers and the material attains unusually high mechanical properties not otherwise available regardless of the thermo-mechanical features.

Transmission electron microscopy observations in bright and dark field (weak beam technique) contrast conditions allowed identification of clusters of point defects in the extruded wires. In the light of these observations they are the only elements (nano-size elements) of the metals' structure which can be held responsible for the unusual properties of the wires.
Estimation of Fe2B growth on low-carbon steel based on two diffusion models
Authors: Ortiz-Domínguez M. , Campos-Silva I. , Hernández-Sánchez E. , Nava-Sánchez J. L. , Martínez-Trinidad J. , Jiménez-Reyes M. Y. , Damián-Mejía O.
Published: April 2011

Two different approaches are used in the evaluation of Fe2B growth and its kinetics over the surface of AISI 1018 steel. The first approach considers a diffusion model based on the mass balance at the growing Fe2B/substrate interface. In the second approach, the method of dimensional analysis was applied to obtain an expression for the boride layer thickness as a function of dependence parameters involved in the boriding process. The Fe2B layers were formed by the paste boriding process at temperatures of 1 123 to 1 273 K with 2, 4, 6, and 8 h of exposure using a boron carbide paste thickness of 4 mm over the surface of the steel. Another set of boriding temperatures with 5 h of exposure were used on the surface of the steel to compare the experimental values of Fe2B layer thicknesses with the results obtained by both diffusion models. The predicted values showed good agreement with the experimental boride layer thicknesses achieved in this work.
Optimization of ZnO2 nanoparticle content in binary blended concrete to enhance high strength concrete
Authors: Nazari Ali , Riahi Shadi
Published: April 2011

The mechanical properties of concrete containing ZnO2 nanoparticles which was cured in saturated limewater have been optimized. ZnO2 nanoparticles were added to concrete as nano-fillers. The specimens were cured in water and saturated limewater for 7, 28 and 90 days after casting and then their strength was evaluated by mechanical testing (compressive, split tensile and flexural strength tests). The results showed that replacement of Portland cement with ZnO2 nanoparticles up to 1.0 wt.% for the specimens cured in water and 2.0 wt.% for the specimens cured in saturated limewater produces concrete with the best strength. It has been shown that curing the specimens in saturated limewater for 28 days and then in water until 90 days, produces a stronger concrete than those cured only in saturated limewater for 90 days. Excess Ca(OH)2 crystals which form after 28 days, when the specimens are cured in limewater, do not contribute to strength enhancement as much as strengthening gel and hence, the mechanical properties of the specimens do not reach the highest level. On the other hand, curing the specimens in water after 28 days produces more strengthening gel and results in a concrete with higher strength. The addition of nanoparticles improves the pore structure of concretes, thus, the refined extent of the pore structure increases with decreasing nanoparticle content. The pore structure of concrete cured in saturated limewater is better than that of concrete cured in water.
On the micromechanics of die compaction of composite powder materials
Authors: Skrinjar Olle , Larsson Per-Lennart
Published: April 2011

In the present investigation a finite element study is performed concerning the local contact behavior of spherical powders in unit cell arrangements of composite powder materials. In particular, die compaction of unit cells of regular body-centered cubic lattices have been studied and the numerical results are compared to previous analytical and numerical findings describing, in particular, local contact but also global behavior in composite powder compaction. The foundation for the analytical results rests on previously published results where approximate composite contact relations are derived from self-similarity considerations in a situation where the powder particles are of the same material. Results pertinent to isostatic compaction are also presented for comparative reasons. The finite element calculations are continued up to full density of solid material in the unit cells.
High-temperature deformation behaviour of Ti3Al-11Nb intermetallic
Authors: Tadić Srdjan , Jančić-Heinemann Radmila , Čolić Katarina , Sedmak Aleksandar
Published: April 2011

A mechanism of high-temperature plasticity has been studied in terms of stress exponent and activation energy for deformation. A Ti3Al-based intermetallic was processed by hot-rolling in the two-phase field to accomplish a fine-grained microstructure. Compression stress – strain tests were conducted in the temperature interval ranging from 900 to 1 050 °C and strain rates between 6.9 · 10− 5 and 2.7 · 10− 2 s− 1. Results indicate that viscous-drag dislocation glide and grain boundary sliding are the main mechanisms of deformation. Activation energy for deformation suggests dependency on the solute content in the -phase.
On the evolution of microstructure in oxygen-free high conductivity copper during thermo-mechanical processing using rotary swaging
Authors: Otto Frederik , Frenzel Jan , Eggeler Gunther
Published: April 2011

In the present work, the processing parameters which govern the evolution of microstructure during rotary swaging and intermediate/subsequent heat treatments in copper rods were studied. Copper ingots with an initial diameter of 40 mm were reduced to a final diameter of 11.7 mm by rotary swaging. Processing sequences were applied with different intermediate anneals and various final heat treatments. The resulting microstructures were characterized using orientation imaging microscopy, optical microscopy and hardness measurements. Special emphasis was placed on the evolution of microstructure with respect to the radial and longitudinal position in the rod. Most importantly, microstructural evidence for torsional loading during swaging was found, and a spiral grain morphology was observed. Moreover, localized deformation events were identified and evidence for abnormal grain growth was found. Finally, a combination of swaging and heat treatment parameters was identified which allowed a homogeneous grain structure to be produced.
Goodness-of-Fit Tests For Elliptical and Independent Copulas through Projection Pursuit
Authors: Touboul Jacques
Published: April 2011

Two goodness-of-fit tests for copulas are being investigated. The first one deals with the case of elliptical copulas and the second one deals with independent copulas. These tests result from the expansion of the projection pursuit methodology that we will introduce in the present article. This method enables us to determine on which axis system these copulas lie as well as the exact value of these very copulas in the basis formed by the axes previously determined irrespective of their value in their canonical basis. Simulations are also presented as well as an application to real datasets.
Harnessing Dendritic Cells for Tumor Antigen Presentation
Authors: Nierkens Stefan , Janssen Edith M.
Published: April 2011

Dendritic cells (DC) are professional antigen presenting cells that are crucial for the induction of anti-tumor T cell responses. As a consequence, research has focused on the harnessing of DCs for therapeutic interventions. Although current strategies employing ex vivo-generated and tumor-antigen loaded DCs have been proven feasible, there are still many obstacles to overcome in order to improve clinical trial successes and offset the cost and complexity of customized cell therapy. This review focuses on one of these obstacles and a pivotal step for the priming of tumor-specific CD8+ and CD4+ T cells; the in vitro loading of DCs with tumor antigens.
AC Power Routing System in Home Based on Demand and Supply Utilizing Distributed Power Sources
Authors: Takuno Tsuguhiro , Kitamori Yutaro , Takahashi Ryo , Hikihara Takashi
Published: April 2011

To help reduce consumption of fossil fuels, renewable, natural and distributed power sources are being adopted. These alternative energy sources inevitably show fluctuations in the amount of output power, frequency, and voltage. The suppression of such fluctuations is a key issue to avoid disturbances in power grids. A similar situation arises as far as the regulation of in-home power flow is concerned. We focus on the quality of supplied and demanded power in particular. In this paper, an in-home power distribution system based on information of power is proposed. The system is developed in order to integrate power dispatch and communication. The experimental results show the feasibility of new flexible and efficient power management approaches.