bluuebunny/crossref_metadata_2025 huggingface dataset:
New Water Treatment Chemical PFZSS Preparation and Application
Authors: Liu Qilin
Published: October 2015

Nowadays global water quality pollution has become extremely serious, and solving water pollution has been
extremely urgent, so researches on water pollution solutions have become even urgent. And flocculating method is the
most traditional water purification method, research and create new high performance flocculating agent is one of flocculating
method inherent problems. The paper mainly describes adding iron, zinc two kinds of metal captions together in
polysyllabic acid, well controlling all aspects requirements in technology, researching and creating new water purification
substance—poly iron and zinc silicate sulfate flocculants (PFZSS). PFZSS making method is weighting proper amount
sodium silicate into container, and meanwhile putting it into water to dissolve, then utilizing dilute euphoric acid and sodium
hydroxide to adjust silicic acid solution pH value and arrive at regulated scope, letting it to activate and arrive at certain
time, slowly importing activated proper silica acid solution into moderate iron sulfate and zinc sulfate on the condition
of fully blending, and finally putting and curing for a while. And implement experiment research on how mixed solution
metal cations matching; making method, pH value, and silicon dioxide concentration these factors affect PFZSS
overall performance. PFZSS application mainly takes catering industry sewage solution as an example to get PFZSS has
very strong absorption capacity, owns good cleaning effects on extremely turbid catering industry treatment sewage COD
and turbidity acquiring, its reaction formed flock density is great, sedimentation rate is very fast, so PFZSS will have great
application prospects in the aspect of treating urban sewage.
The Research of the Mineralogical and Element Geochemical Characteristics of Bauxite in Yunfeng, Qingzhen, in Central Guizhou Province, China
Authors: Wu Yang , Tagen Dai , Yongzhen Long
Published: October 2015

The mineralogical and geochemical characteristics of the Yunfeng bauxite in Qingzhen were investigated
through the handle specimen observation, thin section analysis, XRD、SEM and Element geochemistry. The mineral
analyses reveal that diaspore, kaolinite and chlorite are the major minerals in the bauxite with small amounts of boehmite
and pyrite. Geochemical investigations reveal that the main components in the bauxite are Al2O3, SiO2 and TFe2O3, the
minorcomponents are TiO2, MgO and P2O5. In the process of weathering, some trace elements, such as Zr, Cr, Nb and Hf,
are enriched. Zr vs Hf and Nb vs Ta display higher positive correlation. Trace elements show that Loushanguan Formation
is the main source of material for the bauxite formation and there may be exist other precursor rock provide few
material for the bauxite formation. Ore deposit formed in a O-poor,reducing Marine sedimentary environment.
Influences of Assault Blocks on Rotor Vibrations in AMB System
Authors: Yili Zhu , Yongchun Zhang
Published: October 2015

In an active magnetic bearing (AMB) system, the rotor always rotates at extremely high speed which always
accompany with huge vibrations and noises. Most of the former researches associated with reducing the rotor vibrations
are mainly focused on the control methods of AMB. A new method of installing series of assault blocks in the rotor is
proposed to reduce the rotor vibrations. Firstly, the dynamic models of rotor supported by AMB considering the influences
of assault blocks are established. Then, both dynamic simulations with and without assault blocks are carried out
separately using the real-time AMB support dynamic stiffness. The rotor vibration displacements are mainly analyzed. Finally,
relevant experiments are made to verify the theoretical results. Both theoretical and experimental results validated
the advantages of using assault blocks.
Research on Shoot-Through Zero Vector of Impedance Source Linearization Control Strategy
Authors: Jin Xu , Lin Li , Yuwen Sun
Published: October 2015

Z-source inverter takes advantage of a distinctive impedance source network and modulation method of shoot-through
vector, and achieves the function of buck/boost DC - AC inverter in the single stage system at the same time,
which is suitable for grid-connected PV systems with large input voltage variations. The purpose of this study is to draw a
unified method of shoot-through vector and grid inverter of the z-source inverter, apply the method of state-space averaging
for the modeling analysis of the z-source inverter and give a complete mathematical model. Based on which and according
to the nonlinear control theory and making use of the linearization of affine nonlinear model of the z-source inverter,
we can get the specific derivation of equation. The results of the simulation and experiment show that according to
the linearization of the shoot-through vector with affine nonlinear model for the z-source, we can make the system have
the characteristics of fast and accurate tracking, small overshoot, small DC voltage, AC current ripple and small THD, and
it has a certain practical value.
The Application of Tunnel Reflection Tomography in Tunnel Geological
Advanced Prediction Based on Regression Analysis
Authors: Li Jun , Wang Zong-lin
Published: October 2015

In the tunnel construction, due to the limitation of the survey and design and the complex dynamics of tunnel
surrounding rock geological conditions, so it is difficult for complex geology with the microscopic accurate grasp, often
which caused by geological exploration data do not tally with the actual situation, often encountered in karst water inrush,
large deformation in weak rock, cave-in subsidence, geological hazards, such as gas outburst, rock burst cause person casualties,
delays, in order to minimize geological disaster influence degree, advanced geological prediction before construction
is very necessary. Using regression analysis, based on engineering vault subsidence and horizontal convergence has
carried on the regression analysis, research results can be reference for related engineering design and construction. Detailed
introduces the principle, methods and outstanding characteristic of tunnel reflection tomography advanced prediction
system, and take Jianfengling mountain tunnel of Darui line railway as an example, the prediction results are analyzed
in detailed processing, and on-site validation, finally points out the problem for further study the technology.
Tri-axial Shear Test of Different Damage Remolded Expansive Soil
Authors: Yongsheng Liu , Shiji Wang , Xinyu Dong
Published: October 2015

The deformation and strength characteristics of damaged remolded expansive soil are studied by the tri-axial
tests of different bore diameter damaged expansive soil. The results show that the area and location of cylindrical bores
have significant effect on the mechanical and deformation characteristics of the soil. Little damage can improve the shear
bearing capacity of the specimen; but when the damage is large, the bearing capacity of the specimen is weakened
with the increasing damage. Under the same shearing conditions, partial strain is less than 7%; the specimens with same
damage area and different damage locations have the same force form; while if the partial strain exceeds by 7% in the
same damage area, the bores are closer to the center of the specimen and the shear strength is smaller.
The Stress Characteristics of Numerical Analysis on Bridge Pile Foundation in High and Steep Rock Slopes
Authors: Zhongming He , Senzhi Liu , Tao Wu , Xi Deng
Published: October 2015

The bearing mechanism of bridge pile foundation in high-steep rock slopes is much more complex than that in
the flat. In the basis of theory research and model experiment made by previous scholars, then the software of finite element
method is used on numerical analysis in this paper, which systematically discusses the distribution of body force of
pile, the displacement in pile top and situation of pile’s thrusting force distribution caused by the soil (rock) around the
pile under the combined load, the negative impact of combined load on pile stability was also discussed, which can guide
engineering practice.
Seismic Behavior of the Low-rise Shear Wall with CFST Frame and Embedded Steel-plate
Authors: Yaohong Wang , Dingyan Wu , Wanlin Cao
Published: October 2015

In this paper, two low-rise shear wall specimens are tested on the shaking table, one is shear wall with CFST
frame and embedded steel-plate, the other one is no concrete outside the steel-plate in comparison of the first one. The reduced
scale of the two specimens is 1/12. The seismic wave “Taft” is input in the shaking table test. Based on the experiment,
the author conducts the time history analysis (including elastic stage and plastic stage) of the specimens. The calculated
results and measured results are compared.
Study on the Effect of the Strength Grade on the Creep Behavior of Concrete
Authors: Wenzhong Zheng , Can Tang
Published: October 2015

The internal factors which influenced the concrete creep behavior have been mostly divided by the creep model
at home and abroad, but the computing is complex. In order to directly use the creep model in engineering conveniently, it
is necessary to consider the effect of concrete strength grade on concrete creep. 302 creep test data with a loading age of
28 d, a lasting age of 360 d, and meet certain environmental conditions were collected. The strength of prism with
different aspect ratio and high ratio of cylinder specimen was equivalent to the standard cube strength. The relationship
between the creep compliance and creep degree and the cube compressive strength of concrete was fitted, and influence
coefficient of the strength grade on the creep degree and creep coefficient were obtained. The influence coefficient can be
used to determine creep value, creep coefficient, creep degree of concrete. In this paper, the effect of the strength grade on
creep was considered directly, which involves the cube compressive strength of concrete from 15 MPa to 180MPa. The
research results can be used in broad scope and has certain practical value.
Analysis of Sheet Fracture Failure Based on XFEM
Authors: Chen Xinya , Chen Zhen , Zhao Yang
Published: October 2015

Extended finite element method (XFEM) is the most effective numerical method to solve discrete mechanical
problem. Crack growth problem of two-dimension finite length rectangle panel is researched based on Abaqus XFEM
frame. Stress intensity factor is obtained respectively by theoretical calculation and XFEM simulation, which proves
reliability of XFEM and the software.
Design of Wind Turbine Blade with Thick Airfoils and Flatback and its
Aerodynamic Characteristic
Authors: Xu Lijun , Xu Lei , Zhang Lei , Yang Ke
Published: October 2015

large-scaled blade has posed many problems related to design and production. After introducing the features of
blade with thick airfoils and flatback, based on relevant parameters of Huaren 100 kW wind turbine, the paper designed
blade with thick airfoils and flatback, introduced blade parameter design, and analyzed the aerodynamic performance of
blades using GH bladed software, obtaining the relationship between power output of wind turbine with blade tip speed
ratio Cp. Furthermore, it analyzed the aerodynamic performance of original design blades, modified blades and Huaren
100 kW blades, and assessed the aerodynamic performance of modified blade.
Application Research on Fault Diagnosis of the Filter Unit Based on
Intelligent Algorithm of GA and WNN
Authors: Xuejun Zhao , Mingfang Wang , Jie Wang , Chuangming Tong , Xiujiu Yuan
Published: October 2015

This paper focuses on the potential of GA algorithm for adaptive random global search, and WNN resolution
as well as the ability of fault tolerance to build a multi intelligent algorithm based on the GA-WNN model using the filter
unit of analog circuit for fault diagnosis. Construction of GA-WNN model was divided into two stages; in the first stage
GA was used to optimize the initial weights, threshold, expansion factor and translation factor of WNN structure; while in
the second stage, initially, based on WNN training and learning, global optimal solution was obtained. In the process of
using analog output signal by using wavelet decomposition, the absolute value of coefficient of each frequency band
sequence was obtained along with the energy characteristics of the cross joint, with a combination of feature vectors as the
input of the neural network. Through the pretreatment method, in order to reduce the neural network input, neural grid
size of neurons was reduced in each layer and the convergence speed of neural network was increased. The experimental
results show that the method can diagnose single and multiple soft faults of the circuit, with high speed and high precision.
Analysis of the Influences of Piston Crankshaft Offset on Piston Secondary Movements
Authors: Hongwei Yan , Jin Yang , Baocheng Zhang
Published: October 2015

This paper takes dynamics analysis on the piston and the dynamic lubrication theory on the skirt and the ring of piston
as the basis. Using AVL Glide software, through the establishment of the analysis model of the piston secondary movements, this
study focuses on the effects of the crankshaft bias on piston secondary movements’ characteristics. This paper takes 5 different
offsets, by comparing the piston lateral displacement, transverse movement speed, transverse acceleration, swinging angle, swing
angular velocity and angular acceleration, finds out the relationships between crank offset value and the piston “slap”, piston
impact energy and piston skirt friction loss, thus, provides the basis for the design of internal combustion engines.
State-Dependent Riccati Equation Control for Motion Planning of Space
Manipulator Carrying a Heavy Payload
Authors: Jia Qingxuan , Liu Yong , Chen Gang , Sun Hanxu
Published: October 2015

In this paper, a nonlinear optimal control approach is proposed to plan the motion of a redundant free-floating
space manipulator (FFSM) when carrying a heavy payload. Optimal joint trajectories are determined to track a desired
end-effector path, for which limitations of the manipulator’s load-carrying capacity and tracking accuracy are
simultaneously considered. In this method, FFSM is described as a nonlinear system using the dynamics equation. The
integrated performance indicator is proposed as the cost function, which includes tracking error punishment of the endeffector,
joint-torques optimization, total energy improvement and instability avoidance of the base. Then the statedependent
Riccati equation (SDRE) is established and solved by Taylor series approximation method. The motion
planning algorithm is presented, subject to multi-constraints. Simulations are performed for a 7-DOF space manipulator
and the results are discussed to illustrate the effectiveness of the proposed approach.
Roughness Analysis on Composite Materials (Microfilled, Nanofilled and
Silorane) After Different Finishing and Polishing Procedures
Authors: Pettini Francesco , Corsalini Massimo , Savino Maria Grazia , Stefanachi Gianluca , Venere Daniela Di , Pappalettere Carmine , Monno Giuseppe , Boccaccio Antonio
Published: October 2015

The finishing and polishing of composite materials affect the restoration lifespan. The market shows a variety
of finishing and polishing procedures and the choice among them is conditioned by different factors such as the resulting
surface roughness. In the present study, 156 samples were realized with three composite materials, -microfilled, nanofilled
and silorane-, and treated with different finishing and polishing procedures. Profilometric analyses were carried out on the
samples’ surface, the measured roughness values were submitted to statistical analysis. A complete factorial plan was
drawn up and two-way analysis of variance (ANOVA) was carried out to investigate whether the following factors affect
the values of roughness: (i) material; (ii) polishing/finishing procedure. Tukey post-hoc test was also conducted to evaluate
any statistically significant differences between the material/procedure combinations. The results show that the tested
materials do not affect the resulting surface quality but roughness values depend on the finishing/polishing procedure
adopted. The procedures that involve: (a) the finishing with medium Sof-Lex discs and (b) the finishing with two tungsten
carbide multi-blade milling cutters Q series and UF series are those that allow the lowest values of roughness to be obtained.
Formal Description of a New Subspecies of the European Robin from
Gran Canaria Island, Spain (Aves: Muscicapidae: Erithacus rubecula marionae subsp. nov.)
Authors: Dietzen Christian , Michels J. Pieter , Wink Michael
Published: October 2015

Based on genetic and morphometric differences, Dietzen et al. (2003) [1] proposed to separate the Gran Canaria
Robin from E. r. superbus of Tenerife as a new taxon in a nomenclaturally invalid way. Here, we provide a formal
description of the new subspecies (Erithacus rubecula marionae subsp. nov.) in accordance with the rules of the International
Commission of Zoological Nomenclature.
Visible Research of Loading Speed in Vertical Gas Well
Authors: Xiuwu Wang , Ruiquan Liao , Jie Liu , Xiaowei Wang
Published: October 2015

For gas well under certain conditions, formation water production is inevitable in the later development; Formation
water production is harmful to the normal production, it may cause liquid loading, flooding or even stop production.
Based on the study of liquid loading and the rate laws of liquid loading, taking corresponding measures for the gas
well is important. Simulating formation liquid production of gas wells with single rate under wellbore conditions, observing
and measuring liquid loading rate through the experiment, summing up the liquid loading rate law of wellbore, are
significant to the stability of gas well.
Prediction of Wellbore Temperatures During the Scientific Ultra-Deep
Drilling Process
Authors: Meng Fanhe , Yao Aiguo , Dong Shuwei
Published: October 2015

In order to carry out a series of key basic researches, a scientific ultra-deep drilling plan is being undertaken in
China. Wellbore temperature is one of the key factors during the drilling process. In this paper, we established a twodimensional
transient numerical model to predict the ultra-deep wellbore temperature distributions during circulation and
shut-in stages. The simulation results indicate that the cooling effect of drilling fluid circulation is very obvious, especially
during the inception phase. Drilling fluid viscosity has great influence on the temperature distributions during circulation
stage: the lower the viscosity, the higher the bottomhole temperature. While drilling fluid displacement and inlet temperature
have a little effect on the bottomhole temperature. During the shut-in stage, the wellbore temperature recovery is a
slow process.
A Parameters Calibration Method in Simulated Complex Traffic Network
Authors: Xinghua Hu , Yu Zhang
Published: October 2015

Traffic simulation models have been extensively used because of their ability to model the dynamic stochastic
nature of transportation systems. Parameter calibration is very complex and does not give optimal results easily. Besides,
it is also time-consuming especially for large and complex networks. Initially, the procedure of traffic micro-simulation
parameter calibration was put forward. A Vehicle Intelligent Simulation Software Model (VISSIM) models were selected
for parameter calibration in complex-network, and, the role of Simultaneous Perturbation Genetic Algorithm (SPGA) was
examined in the optimization of component. Moreover an automatic calibration methodology for micro-simulation models
was developed in order to select the best parameter set based on the observed Intelligent Transportation Systems (ITS) data
which proved effective for different networks. Finally, the methodology was applied to calibrate the Beijing city VISSIM
models, followed by the comparison of convergence rate of Genetic Algorithm (GA), Simultaneous Perturbation
Stochastic Approximation (SPSA) and SPGA algorithm. The results show that the SPGA was effective and had good performance.
Synthesis and Characterization of a Series of 1-Aryl-4-[aryldiazenyl]-
piperazines. Part I. Isomers of N-(2,3-Dimethylphenyl)-N’-(Aryldiazenyl)-
Piperazines
Authors: Fan Chenguang , Vaughan Keith
Published: October 2015

This paper describes the synthesis of several new series of 1-(2-aryldiazen-1-yl-) 4-arylpiperazines and 1-(2-
aryldiazen-1-yl-)4-arylalkylpiperazines by using diazonium coupling between arenediazonium ions with the appropriate
1-arylpiperazine or the 1-arylalkylpiperazine. The new compounds have a common thread in that they are isomers of the
series of N-(2,3-dimethylphenyl)- N’-(aryldiazenyl)-piperazines. The new triazenes have been characterized by IR and
NMR spectroscopy and mass spectrometry.
An Assessment Methodology of Shallow Geothermal Energy Projects
Authors: Shuang You , Xiangyu Li , Yu Gao , Wendi Tang
Published: October 2015

Combination of theoretical and numerical analysis, an assessment approach of shallow geothermal energy
project is proposed. A case study on Chongqing is carried out to verify the methods. According to the theoretical
calculation, the heat transfer power per meter of typical boreholes in Chongqing is 40 W/m for cooling and 50 W/m for
heating. The numerical model of 100m borehole heat exchanger (BHE) of ground sourced heat pump (GSHP) system is
built, two sets of heating and cooling loads are input to calculate the ground thermal response, the results show that the
thermal unbalance ratio equals to 1.5 would ensure the safe and reliable long time operation of GSHP system. By
comparing the single and group borehole model, the heat transfer efficiency of BHE is not influenced by adjacent
boreholes with 6m drilling spacing, the temperature distribution among boreholes almost uniform after a year running,
however, the increase of cumulative temperature of the ground reaches 2.2°C after five years running.
Risk factors and the prevalence of anorexia nervosa among female students in Serbia
Authors: Lazarevic Jovana , Batinic Borjanka , Vukosavljevic-Gvozden Tatjana
Published: October 2015

Background/Aim. The widespread symptoms of anorexia nervosa (AN) in young
women require to draw professional attention to this problem in Serbia. In
previous research on AN, insecure attachment styles, perfectionism and
concerns about body shape were identified as notable risk factors. The aim of
this study was to identify the prevalence of AN among female students and
assess the importance of these factors in its development. Methods. The
Eating Attitudes Test (EAT-40), the Experiences in Close Relationships Scale
(ECR), the Frost Multidimensional Perfectionism Scale (FMPS) and the Body
Shape Questionnaire (BSQ) were applied to a sample of 500 randomly selected
female students of the University of Belgrade, the mean age of 22.44 years
(min 18, max 35). In addition, Body Mass Index (BMI) was also calculated.
Results. Although 38 (7.6%) female students displayed symptoms of AN (EAT >
30) and 13 (2.6%) had BMI indicating anorexia nervosa syndrome (BMI ? 17.50
kg/m2), only 1 (0.2%) student fulfilled both criteria. The majority of female
students (60.4%) had some type of insecure attachment style. There is a
significant influence of attachment styles on symptoms of AN: female students
with insecure attachment styles have a significantly higher mean score on the
EAT compared to those with secure attachment style (F = 7.873; p < 0.01).
There was a positive correlation between scores on the EAT and FMPS (r =
0.217; p < 0.01), and scores on the EAT and BSQ (r = 0.388; p < 0.01).
Conclusions. The obtained results show the prevalence of AN of 0.2% among
female students and indicate the importance of insecure attachment styles,
perfectionism and concern about body shape as risk factors. Activities for
the prevention of AN in this subpopulation should include internet-based
therapy and special counseling services with specific programs focusing on
emotion-regulation skills through mindfulness, acceptance and commitment
techniques, as well as specific cognitive-behavioral techniques.
Efficacy of Botulinum toxin type A in treatment of different forms of focal dystonias in the Serbian population: Experience of the Botulinum Toxin Outpatients Department
Authors: Tomic Aleksandra , Vujovic Balsa , Svetel Marina , Dragasevic-Miskovic Natasa , Petrovic Igor , Pekmezovic Tatjana , Kostic Vladimir
Published: October 2015

Background/Aim. Botulinum toxin (BTX) irreversibly inhibits presynaptic
acetylcholine release with subsequent relaxation of abnormally contracting
muscles. It is an effective and well tolerated treatment with long-term
benefit in a variety of movement disorders and other neurological and
non-neurological disturbances. The aim of our study was to present our
experience with BTX type A in treatment of different forms of focal
dystonias. ?ethods. ? hundred of patients with different focal dystonias
(spastic torticollis, blepharospasm and graphospasm) from the Botulinum Toxin
Outpatients Department, Clinic for Neurology, Clinical Center of Serbia, were
included in the study. All the patients were examined and rated at baseline
visit prior to BTX application and on the following visit, after 3-4 months,
using self-assessment improvement questionnaire and standardized rating
scales. Results. The improvement of ? 50% was presented in 68.2% of all (199)
the analyzed applications. Independent predictors of good response to the
therapy (improvement ? 50%) were male sex (p = 0.011), the presence of
sensory trick (p = 0.013) and the total number of BTX applications (p =
0.002). The patients with spastic torticollis and blepharospasm showed a
statistically significantly better BTX effect (improvement 57.3 ? 27.5% and
54.1 ? 28.3%), respectively than the graphospasm group (26.7 ? 25.6%). Most
of the patients did not have therapy complications (81.4% and 72% in two
applications). Side effects in the remaining patients (muscle weakness,
dysphagia, ptosis, double vision, neck weakness and lacrimal dysfunction)
lasted for 28.3 ? 18.6 days after the first treatment and 32.5 ? 36.2 days
after the second one. Conclusion. BTX is safe and highly effective in
long-term treatment of patients with different forms of focal dystonia, with
only mild and well-tolerated side-effects.
Epidemics of the central nervous system infections caused by West Nile virus in the territory of the South Backa District, Vojvodina, Serbia
Authors: Sevic Sinisa , Stefan-Mikic Sandra , Sipovac Dragana , Turkulov Vesna , Milosevic Vesna , Hrnjakovic-Cvjetkovic Ivana
Published: October 2015

Background/Aim. West Nile virus (WNV) is a neurotropic RNA virus particle
which belongs to the Flaviviridae family, genus Flavivirus. It is sustained
in arthropods within the transmission cycle between the mosquitoes and
birds. Most commonly (80% of cases) WNV infections are asymptomatic among
people. Less than 1% of patients develop neuroinvasive forms of the disease
- meningitis, encephalitis, or acute flaccid paralysis. The aim of the
research is to determine most common clinical and laboratory
manifestations, to emphazise the presence of comorbidities and outcomes of
treatment among patients with WNV infection. Methods. This retrospective
study, which was conducted in the period from January 1, 2012 to December
31, 2013, evaluated 32 patients who were diagnosed with WNV infection based
on clinical findings, laboratory, and serological tests. To assess
statistical significance we used ?2, and t-test. Results. The study
involved 22 (69%) males and 10 (31%) females aged from 31 to 65 years. On
admission, there were 16 (50%) febrile individuals, 27 (84.4%) with positive
meningeal signs, 17 (53.2%) with pathological neurological signs, and 10
(31.3%) with consciousness disorders. WNV infection was confirmed by the
method enzyme linked immuno sorbent assay (ELISA) in all the patients, while
Reverse Transcription Polymerase Chain Reaction (RT-PCR) test was positive
in 3 (30%) of the tested patients. Cardiovascular comorbidities dominated in
7 (21.9%) of the cases. Full recovery was accomplished in 87.5 % of the
cases. Conclusion. The results of our study show that the absence of
meningeal signs and fever on the day 7 of hospital treatment are indicators
of good course and prognosis of neuroinvasive forms of WNV infection.
Comorbidities do not increase the risk of disease. ELISA test is a sovereign
diagnostic method. In most cases, after the administered symptomatic
therapy, the complete recovery of patients was achieved.
Application of modern computer-aided technologies in the production of individual bone graft: A case report
Authors: Mirkovic Sinisa , Budak Igor , Puskar Tatjana , Tadic Ana , Sokac Mario , Santosi Zeljko , Djurdjevic-Mirkovic Tatjana
Published: October 2015

Introduction. An autologous bone (bone derived from the patient himself) is
considered to be a ?golden standard? in the treatment of bone defects and
partial atrophic alveolar ridge. However, large defects and bone losses are
difficult to restore in this manner, because extraction of large amounts of
autologous tissue can cause donor-site problems. Alternatively, data from
computed tomographic (CT) scan can be used to shape a precise 3D homologous
bone block using a computer-aided design-computer-aided manufacturing
(CAD-CAM) system. Case report. A 63-year old male patient referred to the
Clinic of Dentistry of Vojvodina in Novi Sad, because of teeth loss in the
right lateral region of the lower jaw. Clinical examination revealed a
pronounced resorption of the residual ridge of the lower jaw in the
aforementioned region, both horizontal and vertical. After clinical
examination, the patient was referred for 3D cone beam (CB)CT scan that
enables visualization of bony structures and accurate measurement of
dimensions of the residual alveolar ridge. Considering the large extent of
bone resorption, the required ridge augmentation was more than 3 mm in height
and 2 mm in width along the length of some 2 cm, thus the use of granular
material was excluded. After consulting prosthodontists and engineers from
the Faculty of Technical Sciences in Novi Sad we decided to fabricate an
individual (custom) bovine-derived bone graft designed according to the
obtained 3D CBCT scan. Conclusion. Application of 3D CBCT images,
computer-aided systems and software in manufacturing custom bone grafts
represents the most recent method of guided bone regeneration. This method
substantially reduces time of recovery and carries minimum risk of
postoperative complications, yet the results fully satisfy the requirements
of both the patient and the therapist.
Effects of variable attachment shapes and aligner material on aligner retention
Authors: Dasy Hiltrud , Dasy Andreas , Asatrian Greg , Rózsa Noémi , Lee Hao-Fu , Kwak Jin Hee
Published: October 2015

Objective: 

To evaluate the retention of four types of aligners on a dental arch with various attachments.

Materials and Methods: 

For this study, three casts were manufactured, two of which contained attachments (ellipsoid and beveled), and one without any attachments to serve as a control. Four types of aligners were thermoformed: Clear-Aligner (CA)-soft, CA-medium, and CA-hard, with various thicknesses, and Essix ACE. Measurements of vertical displacement force during aligner removal were performed with the Gabo Qualimeter Eplexor. Means and standard deviations were next compared between different aligner thicknesses and attachment shapes.

Results: 

CA-soft, CA-medium, and CA-hard did not present a significant increase in retention, except when used in the presence of attachments. Additionally, CA-medium and CA-hard required significantly more force for removal. Essix ACE demonstrated a significant decrease in retention when used with ellipsoid attachments. The force value for Essix ACE removal from the cast with beveled attachments was comparable to that of CA-medium. Forces for aligner removal from the model without attachments showed a linear trend. Essix ACE did not show a continuous increase in retention for each model. Overall, ellipsoid attachments did not present a significant change in retention. In contrast, beveled attachments improved retention.

Conclusions: 

Ellipsoid attachments had no significant influence on the force required for aligner removal and hence on aligner retention. Essix ACE showed significantly less retention than CA-hard on the models with attachments. Furthermore, beveled attachments were observed to increase retention significantly, compared with ellipsoid attachments and when using no attachments.
Rapid maxillary expansion effects in Class II malocclusion: A systematic review
Authors: Feres Murilo Fernando Neuppmann , Raza Hasnain , Alhadlaq Adel , El-Bialy Tarek
Published: October 2015

Objective: 

To evaluate the effectiveness of rapid maxillary expansion (RME) on the sagittal dental or skeletal parameters of growing children with Class II malocclusion.

Materials and Methods: 

A systematic review intended to identify relevant literature was conducted. The search was performed on Medline, Embase, Cochrane Library, and Scopus databases. Reference lists of the included articles were also screened for relevant documents. The qualitative assessment was performed according to the Methodological Index for Non-Randomized Studies (MINORS) tool, and the resultant data were grouped and analyzed concerning dental and skeletal sagittal effects of RME.

Results: 

Of 25 screened studies, seven articles met eligibility criteria and were included. Study samples were observed during mixed dentition stage and characterized as having either Class II dental malocclusion or skeletal discrepancy. None of the included studies was a randomized clinical trial. Included controlled studies presented several inadequacies related to control group or lacked appropriate comparative statistical analysis. Besides being frequently based on deficient methodology, dental and skeletal sagittal effects of RME were either controversial or lacked clinical relevance.

Conclusion: 

The effect of RME on the sagittal dimension of Class II malocclusions has not been proved yet. Future randomized controlled clinical trials are still needed to definitely address this question.
Public Art and the Mega-Event: Two Case Studies
Authors: Kwan Vanessa
Published: October 2015

Using the examples of two public artworks created during and in the wake of the Vancouver 2010 Olympics, this article provides case studies for the conception and production of art in the context of the mega-event. These case studies consider the effects of the mega-event on the experience of public space, and the artist’s ability to negotiate the terms of engagement therein.
Fix
Authors: Bulmer Alex
Published: October 2015

Fix: A Play Provocation and Workshop for Young Audiences is by Alex Bulmer in residency with Theatre Centre UK. Written to be received in the ears, rather than seen with the eyes, the play is intended to be recorded and played to an audience using surround sound technology. The play explores disability, access, and artists as a young woman navigates London’s underground while trying to reach an audition in post-Olympics, austerity-driven London. This play draws on Bulmer’s experience as an actor, director, and playwright formerly based in the UK where she was deeply involved both with Graeae Theatre, an inclusive disability theatre company, and the 2012 London Cultural Olympiad and its Unlimited program. The workshop associated with the play encourages youth audiences to think about the social model of disability in relation to the kinds of barriers that disabled people face in terms of training, arts access, and mobility. Creatively addressing the broader themes of this issue, Fix was first produced by London UK’s Theatre Centre in March 2015.
Theatrical Activism in Vancouver: From the Native Brotherhood and Sisterhood of BC to Marie Clements’s The Road Forward and Back …
Authors: Couture Selena
Published: October 2015

Analyzing the phenomenological performance modes balanced in Marie Clements’s production of The Road Forward during the 2013 Vancouver PuSh festival, I also examine the previous iteration of the project at the Aboriginal Pavilion during the 2010 Winter Olympics. I assert that this production is a continuation of the use of performance as intervention during mega-event in Vancouver by Indigenous performers and activists, linking it to the Native Brotherhood and Sisterhood of British Columbia’s Indian Village and Show during the 1946 celebration of Vancouver’s Diamond Jubilee.
Vancouver’s Olympic Decade from the Professional Arts Perspective
Authors: Low Duncan
Published: October 2015

Vancouver’s Olympic decade began when the BC Liberals were elected to government in May 2001. Their campaign pledges contained a number of positive assertions concerning both the 2010 Olympics and the professional arts community. The new government promised to support BC’s bid to host the 2010 Olympics and to increase funding for the BC Arts Council to promote and support BC arts, music, artists, and culture. This article examines how Vancouver’s, and wider BC’s, professional arts community fared during the Olympic decade, both in the run up and immediate aftermath.
Legacy: Reflecting on the Impact of the 2010 Olympics on Creative and Producing Practices
Authors: Wong Adrienne
Published: October 2015

Theatre artist Adrienne Wong discusses the legacy of creating work within the context of the 2010 Vancouver Olympic and Paralympic Games. She uses as reference points three projects produced by Neworld Theatre in the years leading up to, during, and after the 2010 Vancouver Olympic and Paralympic Games. The artist discusses how the Olympics-related funding in British Columbia facilitated the production of new projects, including PodPlays (a series of locative audio plays), but how the monies also carried expectations for crediting and interacting with Olympic sponsors. Wong explores how these requirements affected the creation and production of HIVE 3 (twelve micro-performances clustered around a central bar), specifically the stipulation of where critique could be expressed (within the artwork) and where it could not (in public statements). Wong posits that protest is central to the experience of the Olympics for people living in BC, where significant budget cuts were implemented that affected all social programs, the arts included. In response, Neworld Theatre produced The Apocalympic Cabaret, a event centred on artists and perspective. Wong concludes that participating in Olympics programming developed her producing skills and left her more deeply invested in using theatre to engage in and promote civic discourse.
Reading Contemporary Women Playwrights: A Conversation, a Review, Some Revelations
Authors: King Moynan , Kopyto Erica , Pizano Beatriz
Published: October 2015

This is a conversational review of a new anthology of critical writing on contemporary women’s plays. Three Toronto-based artists discuss the use and relevance of the volume for artists, teachers, and academics, touching on topics of appropriation, intercultural interpretation, the challenges of getting women’s theatre done, and the exciting wealth of women’s work that is being produced worldwide.
Biological and clinical impact of hemangioblastoma-associated peritumoral cysts in von Hippel-Lindau disease
Authors: Huntoon Kristin , Wu Tianxia , Elder J. Bradley , Butman John A. , Chew Emily Y. , Linehan W. Marston , Oldfield Edward H. , Lonser Russell R.
Published: October 2015

OBJECT

Peritumoral cysts are frequently associated with CNS hemangioblastomas and often underlie neurological morbidity and mortality. To determine their natural history and clinical impact, the authors prospectively analyzed hemangioblastoma-associated peritumoral cysts in patients with von Hippel-Lindau (VHL) disease.

METHODS

Patients with VHL disease who had 2 or more years of follow-up and who were enrolled in a prospective study at the National Institutes of Health were included. Serial prospectively acquired laboratory, genetic, imaging, and clinical data were analyzed.

RESULTS

One hundred thirty-two patients (of 225 in the VHL study with at least 2 years of follow-up) had peritumoral cysts that were followed for more than 2 years (total of 292 CNS peritumoral cysts). The mean age at study entrance was 37.4 ± 13.1 years ([mean ± SD], median 37.9, range 12.3–65.1 years). The mean follow-up was 7.0 ± 1.7 years (median 7.3, range 2.1–9.0 years). Over the study period, 121 of the 292 peritumoral cysts (41.4%) became symptomatic. Development of new cysts was associated with a larger number cysts at study enrollment (p = 0.002) and younger age (p < 0.0001). Cyst growth rate was associated with anatomical location (cerebellum cysts grew faster than spine and brainstem cysts; p = 0.0002 and p = 0.0008), younger age (< 35 years of age; p = 0.0006), and development of new neurological symptoms (p < 0.0001). Cyst size at symptom production depended on anatomical location (p < 0.0001; largest to smallest were found, successively, in the cerebellum, spinal cord, and brainstem). The most common location for peritumoral cysts was the cerebellum (184 cysts [63%]; p < 0.0001).

CONCLUSIONS

Peritumoral cysts frequently underlie symptom formation that requires surgical intervention in patients with VHL disease. Development of new cysts was associated with a larger number of cysts at study enrollment and younger age. Total peritumoral cyst burden was associated with germline partial deletion of the VHL gene.
Conservative surgery in the treatment of giant cell tumor of the sacrum: 35 years’ experience
Authors: Domovitov Stepan V. , Chandhanayingyong Chandhanarat , Boland Patrick J. , McKeown David G. , Healey John H.
Published: October 2015

OBJECT

There is no consensus regarding the appropriate treatment of sacral giant cell tumor (GCT). There are 3 main management problems: tumor control, neurological loss, and pelvic instability. The objective of this study was to examine oncological, neurological, and structural outcomes of sacral GCT after intralesional excision and local intraoperative adjunctive treatment.

METHODS

The authors retrospectively reviewed the records of 24 patients with sacral GCT who underwent conservative surgery (intralesional resection/curettage) at Memorial Sloan Kettering Cancer Center from 1973 through 2012. They analyzed patient demographic data, tumor characteristics, and operative techniques, and examined possible correlations with postoperative functional outcomes, complications, recurrence, and mortality.

RESULTS

There were 7 local recurrences (30%) and 3 distant recurrences (13%). Three of 24 patients (12.5%) had significant neurological loss after treatment—specifically, severe bowel and/or bladder dysfunction, but all regained function within 1–4 years. Larger tumor size (> 320 cm3) was associated with greater postoperative neurological loss. Radiation therapy and preoperative embolization were associated with prolonged disease-free survival. There were no local recurrences among the 11 patients who were treated with both modalities. Based on radiographic and clinical assessment, spinopelvic stability was present in 23 of 24 patients at final follow-up.

CONCLUSIONS

High local and distant recurrence rates associated with sacral GCT suggest the need for careful local and systemic follow-up in managing these patients. Intraoperative preservation of sacral roots was associated with better pain relief, improvement in ambulatory function, and retention of bowel/bladder function in most patients. Fusion and instrumentation of the sacroiliac joint successfully achieved spinopelvic stability in cases deemed clinically unstable. Despite improvement in the management of sacral GCT over 35 years, a need for novel therapies remains. The strategy of combining radiotherapy and embolization merits further study.
The burden and risk factors of ventriculostomy occlusion in a high-volume cerebrovascular practice: results of an ongoing prospective database
Authors: Fargen Kyle M. , Hoh Brian L. , Neal Dan , O’connor Timothy , Rivera-Zengotita Marie , Murad Gregory J. A.
Published: October 2015

OBJECT

Ventriculostomy occlusion is a known complication after external ventricular drain (EVD) placement. There have been no prospective published series that primarily evaluate the incidence of and risk factors for EVD occlusion. These phenomena are investigated using a prospective database.

METHODS

An ongoing prospective study of all patients undergoing frontal EVD placement in the Neurosurgery Intensive Care Unit at the University of Florida was accessed for the purposes of this analysis. Demographic, procedural, and radiographic data were recorded prospectively and retrospectively. The need for catheter irrigation or replacement was meticulously documented. Univariate and multivariate regression analyses were performed.

RESULTS

Ninety-eight of 101 total enrolled patients had accessible data, amounting to 131 total catheters and 1076 total catheter days. Nineteen percent of patients required at least 1 replacement. Forty-one percent of catheters developed at least 1 temporary occlusion, with an average of 2.4 irrigations per patient. Intracranial hemorrhage occurred in 28% of patients after the first EVD placement (2% resulting in new neurological deficit) and in 62% of patients after 1 replacement. The cost of occlusion is estimated at $615 per enrolled patient. Therapeutic anticoagulation and use of small EVD catheters were statistically significant predictors of permanent occlusion (p = 0.01 and 0.04, respectively).

CONCLUSIONS

EVD occlusion is frequent and imparts a significant burden in terms of patient morbidity, physician upkeep, and cost. This study suggests that developing strategies or devices to prevent EVD occlusion, such as the preferential use of larger diameter catheters, may be beneficial in reducing the burden associated with ventriculostomy malfunction.