Preoperative imaging of the inferior alveolar nerve canal by cone-beam computed tomography and 1-year neurosensory recovery following mandibular setback through bilateral sagittal split ramus osteotomy: a randomized clinical trial

Ali Hassani,Vahid Rakhshan,Mohammad Hassani,Hamidreza Mahaseni Aghdam 대한구강악안면외과학회 2020 대한구강악안면외과학회지 Vol.46 No.1

Objectives: One of the most common complications of bilateral sagittal split ramus osteotomy (BSSRO) is neurosensory impairment of the inferior alveolar nerve (IAN). Accurate preoperative determination of the position of the IAN canal within the mandible using cone-beam computed tomography (CBCT) is recommended to prevent IAN dysfunction during BSSRO and facilitate neurosensory improvement after BSSRO. Materials and Methods: This randomized clinical trial consisted of 86 surgical sites in 43 patients (30 females and 13 males), including 21 cases (42 sides) and 22 controls (44 sides). Panoramic and lateral cephalographs were obtained from all patients. In the experimental group, CBCT was also performed from both sides of the ramus and mandibular body. Neurosensory function of the IAN was subjectively assessed using a 5-point scale preoperatively and 7 days, 1 month, 3 months, 6 months, and 12 months post-surgery. Data were analyzed using Fisher’s test, Spearman’s test, t-test, linear mixed-model regression, and repeated-measures ANCOVA (α=0.05, 0.01). Results: Mean sensory scores in the control group were 1.57, 2.61, 3.34, 3.73, and 4.20 over one year and were 1.69, 3.00, 3.60, 4.19, and 4.48 in the CBCT group. Significant effects were detected for CBCT intervention (P=0.002) and jaw side (P=0.003) but not for age (P=0.617) or displacement extent (P=0.122). Conclusion: Preoperative use of CBCT may help surgeons to practice more conservative surgery. Neurosensory deficits might heal faster on the right side.

Enhancing GaN/AlGaN MQW Micro LED Optical and Electrical Performance with a Non-uniform LQB

Hassani Mohamed,Nouredine Sengouga,Afak Meftah 한국전기전자재료학회 2023 Transactions on Electrical and Electronic Material Vol.24 No.5

In this work, physical device modeling of ultraviolet micro light-emitting diodes (UV-μLEDs) based on GaN/AlGaN multiple quantum wells (MQWs) is presented. We numerically investigated the optical and electrical properties of UV-LEDs with a graded last quantum barrier (LQB). The constant content Aluminium (Al) of the LQB is replaced by a graded Al profile to improve the internal quantum efficiency (IQE) in the active MQWs region. The results show that the internal quantum efficiency (IQE) and radiative recombination rate of UV μLEDs with the last linearly increased Al composition LQB are higher than other samples under 90 A/cm 2 current. This composition also contributes to enhanced hole injection efficiency, effective electron confinement, and uniform distribution of carriers in the MQWs caused by the low electrostatic field. As a result, the optical output power is increased 1.94 times, and the spontaneous emission intensity 2.37 times. The simulated results indicate that the LQB AlGaN layer with different compositions of Al modification can mitigate the effect of the effective electron confinement, Auger recombination rate and hole injection, increasing the overlap between electron ditribution profiles.

GABAergic neurons intermingled with orexin and MCH neurons in the lateral hypothalamus discharge maximally during sleep

Hassani, Oum Kaltoum,Henny, Pablo,Lee, Maan Gee,Jones, Barbara E. Blackwell Publishing Ltd 2010 The European journal of neuroscience Vol.32 No.3

<P>Abstract</P><P>The lateral hypothalamus (LH), where wake-active orexin (Orx)-containing neurons are located, has been considered a waking center. Yet, melanin-concentrating hormone (MCH)-containing neurons are codistributed therein with Orx neurons and, in contrast to them, are active during sleep, not waking. In the present study employing juxtacellular recording and labeling of neurons with Neurobiotin (Nb) in naturally sleeping–waking head-fixed rats, we identified another population of intermingled sleep-active cells, which do not contain MCH (or Orx), but utilize &ggr;-aminobutyric acid (GABA) as a neurotransmitter. The ‘sleep-max’ active neurons represented 53% of Nb-labeled MCH-(and Orx) immunonegative (−) cells recorded in the LH. For identification of their neurotransmitter, Nb-labeled varicosities of the Nb-labeled/MCH− neurons were sought within sections adjacent to the Nb-labeled soma and immunostained for the vesicular transporter for GABA (VGAT) or for glutamate. A small proportion of sleep-max Nb+/MCH− neurons (19%) discharged maximally during slow-wave sleep (called ‘S-max’) in positive correlation with delta electroencephalogram activity, and from VGAT staining of Nb-labeled varicosities appeared to be GABAergic. The vast proportion of sleep-max Nb+/MCH− neurons (81%) discharged maximally during paradoxical sleep (PS, called ‘P-max’) in negative correlation with electromyogram amplitude, and from Nb-labeled varicosities also appeared to be predominantly GABAergic. Given their discharge profiles across the sleep–wake cycle, P-max together with S-max GABAergic neurons could thus serve to inhibit other neurons of the arousal systems, including local Orx neurons in the LH. They could accordingly dampen arousal with muscle tone and promote sleep, including PS with muscle atonia.</P>

Design of a smart MEMS accelerometer using nonlinear control principles

Hassani, Faezeh Arab,Payam, Amir Farrokh,Fathipour, Morteza Techno-Press 2010 Smart Structures and Systems, An International Jou Vol.6 No.1

This paper presents a novel smart MEMS accelerometer which employs a hybrid control algorithm and an estimator. This scheme is realized by adding a sliding-mode controller to a conventional PID closed loop system to achieve higher stability and higher dynamic range and to prevent pull-in phenomena by preventing finger displacement from passing a maximum preset value as well as adding an adaptive nonlinear observer to a conventional PID closed loop system. This estimator is used for online estimation of the parameter variations for MEMS accelerometers and gives the capability of self testing to the system. The analysis of convergence and resolution show that while the proposed control scheme satisfies these criteria it also keeps resolution performance better than what is normally obtained in conventional PID controllers. The performance of the proposed hybrid controller investigated here is validated by computer simulation.

Development of an Instrument based on the Protection Motivation Theory to Measure Factors Influencing Women's Intention to First Pap Test Practice

Hassani, Laleh,Dehdari, Tahereh,Hajizadeh, Ebrahim,Shojaeizadeh, Davoud,Abedini, Mehrandokht,Nedjat, Saharnaz Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.3

Background: Given that there are many Iranian women who have never had a Pap smear, this study was designed to develop and validate a measurement tool based on the Protection Motivation Theory to assess factors influencing the Iranian women's intention to perform first Pap testing. Materials and Methods: In this psychometric research, to determine the Content Validity Index (CVI) and the Content Validity Ratio (CVR), a panel of experts (n=10) reviewed scale items. Reliability was estimated through the Intraclass Correlation Coefficient (n=30) and internal consistency (n=240). Also, factor analysis (exploratory and conformity) was performed on the data of the sample women who had never had a Pap smear test (n=240). Results: A 26-item questionnaire was developed. The CVI and CVR scores of the scale were 0.89 and 0.90, respectively. Exploratory factor analysis loaded a 26-item with seven factors questionnaire (perceived vulnerability and severity, fear, response costs, response efficacy, self-efficacy, and protection motivation (or intention)) that jointly accounted for 72.76% of the observed variance. Confirmatory factor analysis indicated a good fit for the data. Internal consistency (range 0.70-0.93) and test-retest reliability (range 0.72-0.96) of sub-scales were acceptable. Conclusions: This study showed that the designed instrument was a valid and reliable tool for measuring the factors influencing the women's intention to perform their first Pap testing.

Preparation of montmorillonite–alginate nanobiocomposite for adsorption of a textile dye in aqueous phase: Isotherm, kinetic and experimental design approaches

Aydin Hassani,Reza Darvishi Cheshmeh Soltani,Semra Karaca,Alireza Khataee 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.21 No.1

In the present work, adsorption of basic red 46 (BR46) by nano-sized montmorillonite (MMT)/calciumalginate (CA) composite was optimized using central composite design. The maximum dye removal of85.07% was obtained at an initial dye concentration of 30 mg L 1, adsorbent dosage of 2 g L 1, contacttime of 60 min and temperature of 25 8C. The adsorption capacity decreased with decreasing both initialpH and mixing speed. The pseudo-second order kinetic model had the highest correlation coefficient(R2 = 1.00). Based on the Langmuir isotherm model, the maximum adsorption capacity of MMT/CA wasabout 35 mg g 1.

WUF-W Moment Connection in Steel Box-Column Subjected to the New Cyclic Loading Protocol

M. Hassani Sokhtesaraei,M. Ghassemieh,S.R. Mirghaderi 한국강구조학회 2022 International Journal of Steel Structures Vol.22 No.4

Loading protocols simulate local earthquakes are usually used to evaluate structural components’ strength and deformation capacities. First, the present research proposes a loading protocol that accurately simulates the local seismic demand based on far-fi eld conditions, while being also consistent with the region’s structural design and construction conditions. The proposed loading protocol can be applied to the steel structure’s bending components, particularly the steel moment connections in general and experimental terms. Moreover, the proposed loading protocol presents the guidelines for evaluating the moment connections’ performance at the target, qualifying, and collapse control levels. Similar specimens of welded unreinforced fl ange-welded web (WUF-W) steel moment connections in box-columns were subjected to the proposed and SAC loading protocols in the laboratory; and the results were analysed. Based on the experimental and fi nite element studies performed in this research and matching and controlling the proposed loading protocol’s presented conditions and regulations, the damage parameters and the seismic demand resulting from both loading protocols were evaluated and compared. The experimental and fi nite element of the WUF-W connections have well satisfi ed the target value level; and the qualifying condition of the proposed and SAC loading protocols and the control conditions of the collapse threshold provided in the proposed loading protocol was well satisfi ed the experimental specimen.

Application of Dominating Sets in Wireless Sensor Networks

Amir Hassani Karbasi,Reza Ebrahimi Atani 보안공학연구지원센터 2013 International Journal of Security and Its Applicat Vol.7 No.4

Multiple unequal cracks between an FGM orthotropic layer and an orthotropic substrate under mixed mode concentrated loads

M. Hassani,M.M. Monfared,A. Salarvand 국제구조공학회 2023 Structural Engineering and Mechanics, An Int'l Jou Vol.86 No.4

In the present paper, multiple interface cracks between a functionally graded orthotropic coating and an orthotropic half-plane substrate under concentrated loading are considered by means of the distribution dislocation technique (DDT). With the use of integration of Fourier transform the problem is reduced to a system of Cauchy-type singular integral equations which are solved numerically to compute the dislocation density on the surfaces of the cracks. The distribution dislocation is a powerful method to calculate accurate solutions to plane crack problems, especially this method is very good to find SIFs for multiple unequal cracks located at the interface. Hence this technique allows considering any number of interface cracks. The primary objective of this paper is to investigate the effects of the interaction of multiple interface cracks, load location, material orthotropy, nonhomogeneity parameters and geometry parameters on the modes I and II SIFs. Numerical results show that modes I/II SIFs decrease with increasing the nonhomogeneity parameter and the highest magnitude of SIF occurs where distances between the load location and crack tips are minimal.

Adsorption of a cationic dye from aqueous solution using Turkish lignite: Kinetic, isotherm, thermodynamic studies and neural network modeling

A. Hassani,F. Vafaei,S. Karaca,A. R. KHATAEE 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.4

The adsorption ability of Turkish lignite as a cheap and abundant material for removal of methylene blue was investigated. The depending of adsorption capacity on contact time, initial dye concentration, amount of adsorbent, mixing rate, pH and temperature was studied. An artificial neural network was used to model the adsorption process. BET, SEM and FT-IR analysis before and after adsorption were performed. The adsorption kinetic, thermodynamic and isotherm were also investigated. The rate of adsorption was shown the best fit with the pseudo-second order model. The values of thermodynamic parameters indicated that the dye adsorption on the lignite was endothermic.