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q angle

Isil Aras, Idil Unal, Gencer Huniler, Aynur Aras
OBJECTIVES: Purpose of the present study was to compare external root resorption (ERR) volumetrically in maxillary incisors induced by orthodontic treatment using self-ligating brackets (Damon Q, DQ) or conventional brackets (Titanium Orthos, TO) with the help of cone-beam computed tomography (CBCT). PATIENTS AND METHODS: A sample of 32 subjects, with Angle Class I malocclusion and anterior crowding of 4-10 mm, was divided randomly into two groups: a DQ group, in which self-ligating DQ brackets with Damon archwires were used; and a TO group, in which conventional TO brackets with large Orthos archwires were applied...
April 12, 2018: Journal of Orofacial Orthopedics, Fortschritte der Kieferorthopädie
R L Wang, Z H Zhou, Y C Xi, Q N Wang, N H Wang, Z Huang
OBJECTIVE: To propose a kind of robotic ankle-foot rehabilitation system for children with cerebral palsy and to preliminarily verify its feasibility in clinical application. METHODS: A robot assisted ankle-foot rehabilitation system was specially designed and developed for children with cerebral palsy and a preliminary clinical study was conducted in Department of Rehabilitation Medicine, Peking University First Hospital. Modified Tardieu Scale and joint biomechanical properties (ankle plantar flexion resistance torque under different ankle dorsiflexion angles) were measured to analyze the muscle tone and soft tissue compliance of the ankle plantar flexors pre- and post-robotic training intervention...
April 18, 2018: Beijing da Xue Xue Bao. Yi Xue Ban, Journal of Peking University. Health Sciences
Zoltán Dudás, Eugenia Fagadar-Cosma, Adél Len, Loránd Románszki, László Almásy, Beatrice Vlad-Oros, Daniela Dascălu, Andraž Krajnc, Manfred Kriechbaum, Andrei Kuncser
This work is focused on a novel class of hybrid materials exhibiting enhanced optical properties and high surface areas that combine the morphology offered by the vinyl substituted silica host, and the excellent absorption and emission properties of 5,10,15,20-tetrakis( N -methyl-4-pyridyl)porphyrin-Zn(II) tetrachloride as a water soluble guest molecule. In order to optimize the synthesis procedure and the performance of the immobilized porphyrin, silica precursor mixtures of different compositions were used...
April 6, 2018: Materials
Natalya F Naumenko
Multilayered substrates, including thin plates of LiTaO3 (LT) bonded to silicon (Si) or glass wafers either directly or via intermediate layers, were numerically investigated as potential materials for surface acoustic wave (SAW) resonators with high quality (Q)-factor required for the next generation of mobile communication systems. The propagation velocities and electromechanical coupling coefficients of shear horizontally (SH) polarized acoustic waves were estimated as functions of LT orientation and thicknesses of all layers in LT/Si, LT/SiO2 /Si, LT/glass, LT/AlN/glass and structures with several pairs of SiO2 /AlN layers between LT and the glass wafer...
March 31, 2018: Ultrasonics
Nghia Q Nguyen, Richard W Prager
A new approach to implement minimum variance distortionless response (MVDR) beamforming is introduced for coherent plane-wave compounding (CPWC). MVDR requires the covariance matrix of the incoming signal to be estimated and a spatial smoothing approximation is usually adopted to prevent this calculation from being underconstrained. In the new approach, we analyze MVDR as a spatial filter that decorrelates signals received at individual channels before summation. Based on the analysis, we develop two MVDR beamformers without using any spatial smoothing...
April 2018: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
M Q Liu, C Y Zhao, B X Wang
We have achieved efficient polarization manipulations based on dipolar interferences and lattice couplings in one-dimensional cylindrical metalattices. First, we employ the scattering asymmetry factor g to quantify the directional scattering ability and find the maximum |g|max =1/2 for a cylinder with effective excitations of electric and magnetic dipoles simultaneously. Further, the strong negative-g (gp = -0.38) for p-polarization and positive-g (gs = 0.68) for s-polarization are obtained within a narrow visible band using c-Si with experimental data...
March 19, 2018: Optics Express
R Q Yang, Z Y Liu, Y Nan, F Wang, Q Q Yu, L M Fan
Objective: To probe the effect of multiple pregnancy on pelvic floor function of pregnant women, Pelvic floor ultrasonography was performed on the 42 day postpartum women.And the bladder neck mobility, bladder and urethral posterior angle and pelvic diaphragmatic hiatus area were measured. Methods: Collect 200 cases 42 day postpartum women who visited the second hospital of Jilin University from July 2015 to June 2017, of which 100 cases of primipara belong to group A, 100 cases of multiple pregnancy belong to group B, and 100 cases without maternal at the same age belong to the control group, ultrasound measurement of the bladder neck mobility, bladder and urethral posterior angle and pelvic diaphragmatic hiatus area were measured...
March 20, 2018: Zhonghua Yi Xue za Zhi [Chinese medical journal]
Q Yao, D W Shen, C H P Wen, C Q Hua, L Q Zhang, N Z Wang, X H Niu, Q Y Chen, P Dudin, Y H Lu, Y Zheng, X H Chen, X G Wan, D L Feng
van der Waals heterostructures (VDWHs) exhibit rich properties and thus has potential for applications, and charge transfer between different layers in a heterostructure often dominates its properties and device performance. It is thus critical to reveal and understand the charge transfer effects in VDWHs, for which electronic structure measurements have proven to be effective. Using angle-resolved photoemission spectroscopy, we studied the electronic structures of (PbSe)_{1.16}(TiSe_{2})_{m} (m=1, 2), which are naturally occurring VDWHs, and discovered several striking charge transfer effects...
March 9, 2018: Physical Review Letters
X Q Wang, C S Wu, S Sun, J Wang, W Li, W Zhang
Objective: To investigate the situation of hip dislocation with the application of "femur first" principle and "combined anteversion technique" during total hip arthroplasty. Methods: A retrospective analysis has been done on the clinical data about 104 patients(133 hips)who were diagnosed as hip disease and were treated with total hip arthroplasty by the doctors from the Department of Joint Orthorpaedics of Shandong Provincial Hospital Affiliated to Shandong University from June 2014 to June 2016, and all the prostheses applied in the operation were cementless ones...
April 1, 2018: Zhonghua Wai Ke za Zhi [Chinese Journal of Surgery]
Yu Sun, Qian Wang, Shunjie Gu, Zaoneng He, Qingfeng Wang, Fucheng Zhang
A medium-carbon Cr-Mo-V martensitic steel was thermally processed by quenching (Q) at 890 °C and tempering (T) at increasing temperatures from 650 °C to 720 °C and the effect of tempering temperature, T t , on sulfide stress cracking (SSC) behaviors was estimated mainly via double cantilever beam (DCB) and electrochemical hydrogen permeation (EHP) tests and microstructure characterization. The results indicate that the threshold stress intensity factor for SSC, K ISSC , increased with increasing T t . The overall and local H concentration around the inclusions decreased with increasing T t , due to reductions in the amounts of solute atoms, grain boundaries and dislocations, which effectively prevented SSC initiation...
March 9, 2018: Materials
Eva Lopezosa-Reca, Gabriel Gijon-Nogueron, Irene Garcia-Paya, Ana Belen Ortega-Avila
This aim of this study is to observe the differences in foot posture and the angle of the knee according to different physical activities. Seventy-eight football players and 72 swimmers were recruited, and in each case a foot posture analysis, based on the foot posture index (FPI), was conducted and the Q angle of the knee was determined. The following mean values were obtained for the lower extremities: in the swimmers, FPI 6.45 ± 2.04 and Q angle 15.38º ± 3.79º. In the footballers, FPI 2.23 ± 1.72 and Q angle 13...
March 4, 2018: Research in Sports Medicine
Kent R Thurber, Thanh-Ngoc Le, Victor Changcoco, David J R Brook
Solid-state dynamic nuclear polarization (DNP) using the cross-effect relies on radical pairs whose electron spin resonance (ESR) frequencies differ by the nuclear magnetic resonance (NMR) frequency. We measure the DNP provided by a new water-soluble verdazyl radical, verdazyl-ribose, under both magic-angle spinning (MAS) and static sample conditions at 9.4 T, and compare it to a nitroxide radical, 4-hydroxy-TEMPO. We find that verdazyl-ribose is an effective radical for cross-effect DNP, with the best relative results for a non-spinning sample...
March 1, 2018: Journal of Magnetic Resonance
Nan Ji, Tiantian Liu, Jingjie Xu, Longzhu Q Shen, Benzhuo Lu
Membrane channel proteins control the diffusion of ions across biological membranes. They are closely related to the processes of various organizational mechanisms, such as: cardiac impulse, muscle contraction and hormone secretion. Introducing a membrane region into implicit solvation models extends the ability of the Poisson-Boltzmann (PB) equation to handle membrane proteins. The use of lateral periodic boundary conditions can properly simulate the discrete distribution of membrane proteins on the membrane plane and avoid boundary effects, which are caused by the finite box size in the traditional PB calculations...
February 28, 2018: International Journal of Molecular Sciences
X Xu, L Xu, J H Jiang, J Q Wu, X T Li, W D Jing
OBJECTIVE: To evaluate the accuracy and reliability of detecting alveolar bone dehiscence and fenestration of maxillary anterior teeth of Angle class III by cone-beam computed tomography (CBCT). METHODS: Eighteen Angle class III patients with 108 maxillary anterior teeth were included (3 males and 15 females) who accepted modified corticotomy in orthodontic therapy. The mean age was 23.6 years (18-30 years). The clinical detection of dehiscence and fenestration was done when modified corticotomy was performed by the same periodontist...
February 18, 2018: Beijing da Xue Xue Bao. Yi Xue Ban, Journal of Peking University. Health Sciences
Y Liao, X Q Liu, L Chen, J F Zhou, J G Tan
OBJECTIVE: To evaluate the effects of different surface treatments on the shear bond strength between zirconia and resin cement. METHODS: Forty zirconia discs were randomly divided into four groups (10 discs in each group) for different surface treatments: control, no surface treatment; sandblast, applied air abrasion with aluminum oxide particles; ultraviolet (UV), the zirconia sample was placed in the UV sterilizer at the bottom of the UV lamp at 10 mm, and irradiated for 48 h; cold plasma, the discs were put in the cold plasma cabinet with the cold plasma generated from the gas of He for 30 s...
February 18, 2018: Beijing da Xue Xue Bao. Yi Xue Ban, Journal of Peking University. Health Sciences
Q Y Chen, D F Xu, X H Niu, R Peng, H C Xu, C H P Wen, X Liu, L Shu, S Y Tan, X C Lai, Y J Zhang, H Lee, V N Strocov, F Bisti, P Dudin, J-X Zhu, H Q Yuan, S Kirchner, D L Feng
A key issue in heavy fermion research is how subtle changes in the hybridization between the 4f (5f) and conduction electrons can result in fundamentally different ground states. CeRhIn_{5} stands out as a particularly notable example: when replacing Rh with either Co or Ir, antiferromagnetism gives way to superconductivity. In this photoemission study of CeRhIn_{5}, we demonstrate that the use of resonant angle-resolved photoemission spectroscopy with polarized light allows us to extract detailed information on the 4f crystal field states and details on the 4f and conduction electron hybridization, which together determine the ground state...
February 9, 2018: Physical Review Letters
Shelby Brown, Michael Mirmanesh, Ping Song, Demetrius Coombs, David Rengifo, Lee L Q Pu
BACKGROUND: Although many aesthetic surgeons believe that beveling the angle of an incision improves the aesthetic outcome with regard to scaring, the literature remains scarce largely because few studies have been conducted. OBJECTIVE: This systematic review therefore aims to identify whether using a beveled incision adds an aesthetic benefit, to determine whether there is a specific angle that yields a superior outcome, and for the first time, to present a complete discussion of this subject for practicing surgeons...
February 23, 2018: Aesthetic Plastic Surgery
Nicolas Reina, William H Trousdale, Christopher G Salib, Loribeth Q Evertz, Lawrence J Berglund, Andre J van Wijnen, Timothy E Hewett, Charlotte E Berry, Daniel J Berry, Mark E Morrey, Joaquin Sanchez-Sotelo, Matthew P Abdel
The current method of measuring arthrofibrosis in live rabbits is critically limited. Specifically, this method involves radioactive fluoroscopy, error-prone goniometric measurements, and static joint angle outcomes that fail to approximate the compliance of tissues surrounding the joint. This study aims to validate a novel method of capturing the compliance of contracted tissues surrounding the joint without the use of fluoroscopy or animal sacrifice. Surgically induced contractures of one-hundred and eight rabbits were measured using the current standard of contracture measurement (a pulley system) as well as a newly designed dynamic load cell (DLC) device...
February 23, 2018: Journal of Orthopaedic Research: Official Publication of the Orthopaedic Research Society
Joseph E Holland, Ignacio Moreno, Jeffrey A Davis, María M Sánchez-López, Don M Cottrell
We encode q-plates where the angular orientation of the principal axis is varied spatially with a nonstandard distribution. In the usual q-plate design, the orientation of the optical axis depends linearly on the azimuthal angle. In this work, we examine cases where this azimuthal dependence is nonlinear. We consider two cases: first, where the principal axis distribution is like an inverse-tangent function of the azimuth; and second, where it displays linear and flat segments. This last case is proposed as a new method for encoding binary data into the azimuthal lobes of the vector beam...
February 10, 2018: Applied Optics
Yilmaz Emre Gencay, Martine C H Sørensen, Cory Q Wenzel, Christine M Szymanski, Lone Brøndsted
Campylobacter jejuni NCTC12662 is sensitive to infection by many Campylobacter bacteriophages. Here we used this strain to investigate the molecular mechanism behind phage resistance development when exposed to a single phage and demonstrate how phase variable expression of one surface component influences phage sensitivity against many diverse C. jejuni phages. When C. jejuni NCTC12662 was exposed to phage F207 overnight, 25% of the bacterial cells were able to grow on a lawn of phage F207, suggesting that resistance develops at a high frequency...
2018: Frontiers in Microbiology
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