Introduction: The aim of this study was to evaluate the ability of pressurized water irrigation technique (AquaPick Device) as an intra-canal irrigation technique and compare it with sonic irrigation device (Endoactivator) for their ability to remove smear layer from canals. Methods and Materials: Total number of 80 single rooted teeth (premolars) were prepared, divided into eight main groups, Group 1: Aquapick with apically vented needle/18 mm depth, Group 2: Aquapick with apically vented needle/15 mm depth, Group 3: Endoactivator device/18 mm depth, Group 4: Endoactivator device/15 mm depth, Group5: Aquapick with 2 side vented needle/18 mm depth, Group 6: Aquapick with 2 side vented needle/15 mm depth and two control groups. Then all samples were tested by SEM in 3, 6 and 9-mm distances from the apical foramen. The data were statistically analyzed using Kruskal Wallis and Mann-Whitney U tests. Results: There was a high significant difference among the tested groups with the best removal of smear layer by the use of pressurized water irrigation device with apical vented needle especially at the 3 mm area. Conclusion: Pressurized water irrigation technique could be used as intra-canal irrigation technique with good results.

Spontaneous migration of an intrauterine device into the bladder is very rare. Foreign bodies of the urinary bladder may occur by self-insertion or migration from neighbor organs. When ignored for a long time, foreign bodies act as a core for calculus formation. The patient usually present with dysuria and intermittent urinary tract infections.A 42-year-old woman is reported in whom an intrauterine device had been placed 7 years before this report, and complained of chronic pelvic pain, recurrent urinary tract infections and irritative urinany tract symptoms. After observation of stone in the bladder, the intrauterine device and the surrounded stone was removed by suprapubic cystolithotomy.

Misplacement of tracheal tube in the esophagus remains a significant cause of morbidity and mortality in anesthesia despite decades of effort aimed at prevention or (more importantly) detection of such an event. We have evaluated a cheap, simple and quick device (Esophageal Detector Device; EDD) which relies mainly on the relation or otherwise of an evacuated elastic bulb applied to the supposed (tracheal) or (esophageal) tube.Identical tracheal tubes were passed into the trachea and esophagus of 100 patients, the left and right position in the mouth was chosen at random.The test was conducted by a second person, not present at intubations and unaware of the tube placed in the trachea. There were no false negatives (relation of elastic bulb applied to the tracheal tubes) probably due to bronchospasm early after induction of anesthesia. Correct deduction of the tracheal tube position was achieved in 98 patients using the device. We conclude that EDD could be a very sensitive (100%) and reliable method for detection of esophageal intubations however, it is recommended in further studies to test the tubes immediately after intubations (when bronchospasm is most probable) to find the exact specificity and accuracy of the device.

By beginning of the year 2020, COVID-19 has spread all over the world. The virus has caused numerous social, medical, and political challenges. One of the major challenges faced by countries to control the outbreak of the virus was the stability of economic and social activities and the simultaneous fulfilling of work during quarantine. Under such circumstances, telework is employed as one of the important policies control the virus. Moreover, many employees have tendency for remote working or teleworking. In such a situation, the importance of applying the Bring Your Own Device (BYOD) approach to fulfill job duties seems obvious. To enjoy the benefits of BYOD, organizations need the right policy for applying BYOD. This perspective endeavors to shed light on how to apply BYOD policy. From the researchers' point of view, the important facets that could be addressed when applying BYOD can be described like this: policy is appropriate decision-making and implementation, technical infrastructure, continuous communication, staff training, security and privacy protocols, and agreement between staff and organization as well as the use of cloud computing.

Base station assisted device-to-device communications (D2D) lets cellular users communicate directly. As D2D connections can operate on a joint frequency band, interference management is essential to boost the spectral efficiency and users’ quality of service. Two different approaches are proposed to tackle the interference in D2D networks. A power control scheme and a frequency-time scheduling are examined to achieve long-term fairness among D2D users. The power control maximizes weighted sum-rate of the users, where the weights indicate priority of the users. The second proposed strategy is to avoid interference when it is high. In this algorithm, the spectrum band is divided among users as interference coupling rises. A metric from the information theory literature has been adopted to measure the coupling. The proposed schemes are tested through multiple time slots and the average rate of a user and network sum-rate have been observed. The results demonstrate the superior performance of the proposed power control scheme.

The video is a popular service among users which plays an important role in the networks traffic and has hugest volume of data compared to other types of communications. In recent years, the great willingness of users to watch live videos has attracted the researchers to the networks equipped with content saving devices in which the video content is saved in advance within the edge devices (small stations and smart devices) for fast delivery. In this paper, we have proposed a new method to send the video content based on the D2D connection and providing a multi-connection and multi-user opportunities. According to the random nature of the popularity of video content and the random demands of users in the network, the authors of the article use the random distribution of popularity among users to investigate the probability of sending the same content to some users simultaneously. In this method, the requests of some users are answered by one response. Extensive simulations results of the proposed method reveals the important effect of the random distribution of video content popularity and show that using multi-link D2D connections can cause significant improvements in the efficiency of the network in term of the network throughput.