Effect of composite/amalgam thickness on fracture resistance of maxillary premolar teeth, restored with combined amalgam-composite restorations

Background: Combined amalgam-composite restorations have been used through many years to benefit from the advantages of both dental amalgam and composite resin. Two variations have been mentioned for this technique, this study investigated the fracture resistance of maxillary premolar teeth with extended mesio-occluso-distal (MOD) cavities, restored with the two variations of combined amalgam-composite restorations. Material and Methods: Sixty intact extracted premolar teeth were randomly divided into 6 groups (G1-G6) of 10 teeth. G1; consisted of intact teeth and G2; consisted of teeth with MOD preparations were assigned as the positive and negative control groups respectively. Other experimental groups after MOD preparations were as follows: G3, amalgam restoration; G4, composite restoration; G5 combined amalgam-composite restoration with amalgam placement only on 1mm of the gingival floor of the proximal boxes; G6, combined amalgam-composite restoration with amalgam placement to the height of contact area of the proximal surface of the tooth. Fracture strength of the specimens was measured and the data were analyzed using one-way analysis of variance (ANOVA). The level of significance was P˂0.05. Fracture mode of the specimens was also recorded. Results: G1 had the highest value of fracture resistance (1736.90 N). G2 and G3 had the lowest fracture resistance (775.70 N and 874.70 N, respectively). The difference between G 4, 5 and 6 was not statistically significant. However, G4, G5 and G6 showed significantly higher resistance to fracture compared to G2 and G3. Fracture modes were favorable in all of the study groups except in G6. Conclusions: Fracture resistance of the premolars restored with the two variations of combined amalgam-composite restoration was similar to that achieved with composite restoration alone and more than that of amalgam restoration alone. It can be concluded that the thickness of amalgam in combined amalgam-composite restorations did not affect fracture resistance of the teeth

Machine learning approaches for dietary assessment

When considering individuals with dietary limitations, automatic food recognition, and assessment are paramount. Smartphone-oriented applications are convenient and handy when dish recognition and the elements inside are required. Machine learning (deep learning) applied to image recognition, alongside other classification techniques (for example, bag-of-words), are possible approaches to tackle this problem. The current most promising approach to the classification problem is deep leaning, which requires high computation for training, but it is an extremely fast and computationally light classifier. Since the requirement for the classifiers to be as accurate as possible, the humans must also be considered as the classifier. This work tests and compares deep-learning methods bag-of-words applied to computer vision, and the human visual system. Results show that deep learning is better when considering a low number of food categories. However, with more food categories, the human overcomes the machine algorithms

Experimental Investigation of Non-Hermiticity in Quantum Systems

The investigation of quantum systems in experimental setups involves interaction with the environment, which introduces channels of dissipation. These systems can be described by a non-Hermitian Hamiltonian, capturing the effect of gain and loss. Realizing these systems in classical cases demonstrates interesting phenomena such as topological features in the optical and mechanical domain, energy transfer, and enhancement in sensing. The primary focus of this thesis is the realization of the non-Hermiticity in a quantum system. To accomplish this, we harness multiple energy levels of an anharmonic superconducting circuit with coupling to an engineered bath to investigate the static and dynamic features of the system. The static features of our system provide us with detail about the energy landscape and its corresponding eigenstate. The unique energy landscape is investigated further by using a time-dependent drive to study the adiabatic limit. In dissipative dynamics, the role of quantum jumps becomes crucial in studying adiabatic processes. Further study of the non-Hermiticity with decoherence processes exhibits unique topology and energy landscape which will help us understand more complex open quantum systems. These studies provide insight into open quantum system dynamics and how to harness their unique characteristics in a fully quantum regime

MODELING THE MEDIATING ROLE OF JOB BURNOUT IN INFLUENCE OF JOB STRESS ON THE COMMITMENT AND TURNOVER OF EMPLOYEES OF BRANCHES OF SADERAT BANK IN ZABOL

Abstract. The purpose of this study was to examine the effect of job stress on the commitment and turnover of the employees of Saderat Bank in Zabol by considering the mediating role of job burnout. The statistical population of this study consists of all employees and managers of branches of Saderat Bank in Zabol, who are currently working. According to the prosecution, the size of the population is estimated 1248 people. For sampling, the Cochran sample size formula with limited population was used. Finally, 295 statistical units were analyzed. The data collection instrument used in this study was a series of standard questionnaires. Additionally, in order to describe the data analysis and to test the hypothesis of the research, inferential statistics and structural equation modeling method have been usedand analyzed via LISREL. After analyzing the data, the results of research hypothesis testing indicate that job stress has a positive effect on job burnout and job stress has positive effect on turnover. In addition, the negative effect of job burnout on organizational commitment was accepted.Keywords: Job Stress, Job Burnout, Organizational Commitment, Branches of Saderat Bank in Zabol

Chemical compositions of essential oil and antioxidant activity of dragonhead (Dracocephalum moldavica) in sole crop and dragonhead- soybean (Glycine max) intercropping system under organic manure and chemical fertilizer

Organic manure can be used as an alternative for chemical fertilizers in sustainable agriculture. In addition, compared with sole cropping systems, intercropping is a promising approach for the crop production due to its lower reliance to chemical fertilizers. In this study, grain yield of soybean and biomass, chemical compositions and antioxidant activity of dragonhead essential oil in sole crop and dragonhead-soybean intercropping system under organic and chemical fertilizers were investigated. Land equivalent ratio (LER) was calculated as well. Results indicated intercropping and application of organic manure, increased soybean grain yield and dragonhead biomass. The LER value for soybean: dragonhead with ratios of 1:1 and1:2 under organic manure was greater than 1, indicating superiority of intercropping versus sol crop systems. GC–MS analysis showed that geranial, geranyl acetate, neral and piperitone were major compounds of dragonhead. The geranial and neral contents were increased in sole cropped dragonhead with application of chemical fertilizer, while the piperitone content was enhanced in sole cropped plants fertilized with organic manure. The highest of geranyl acetate content was observed in intercropped dragonhead plants fertilized with chemical fertilizer. Addition of organic manure lead to increase the antioxidant capacity of dragonhead in intercropped plots. The highest antioxidant activity of dragonhead (IC50 = 1.45 μgmL−1) was observed in one row of soybean + two rows of dragohead treated with organic manure. Overall, one row of soybean + two rows of dragohead with use of organic manure was more productive and had the highest LER value, antioxidant activity and a large amount of chemical compositions of essential oil. Thus this treatment could be adopted by the medicinal plant growers for appropriate production of dragonhead. © 2018 Elsevier B.V

Prevalence and Management of Gastric Leakage After Laparoscopic Sleeve Gastrectomy: A Case Study in Modarres Hospital, Tehran, Iran

Background: Sleeve gastrectomy is an effective procedure for weight loss. However, some serious complications may occur during this operation such as strictures, bleeding, and leak. According to previous studies, the rate of leak was 1.06%. Using endoscopic stents have been hampered by some drawbacks the most important of which is repeated migration. The current study aimed to discuss the prevalence and management of leak after laparoscopic sleeve gastrectomy operated at Modarres Hospital, Tehran, Iran.Methods: This cross-sectional study was conducted on patients with morbid obesity undergone laparoscopic sleeve gastrectomy at Modarres Hospital, Tehran, Iran. In addition to the patients’ demographic data; their leak complications, first symptoms and signs, WBC count, and method of management were extracted and collected from their medical files. Results: A total number of 1263 patients were enrolled in this study. Of them 8(0.63%) patients suffered from leak after the operation. The mean (SD) age of patients with leak was 32.33(6.02) year. The mean (SD) BMI of patients with leak was 45.75(2.07) kg/m2. The mean (SD) of WBC count of the patients with leak was 13680(7272.68). The symptoms of the patients began on different days (3-240 day). Management of the patients was different but most of the patients underwent endoscopic stent.Conclusion: It seems that stent insertion is a useful method for treatment of leak after sleeve gastrectomy, especially in immediate leak

An overview on software testing and auditing

More and more people are dependent on technology. They increasingly use electronic services for day-to-day routines, and user loyalty to the software is essential, being defined by the excellence of the SW. The fewer flaws it has, the greater the likelihood of being able to retain the user’s loyalty. For this situation to be possible, tests are crucial in the development stage since they have the main purpose of identifying errors. To be possible to have a good quality of software, it is important to realize the importance of carrying out tests, as well as to understand what types of tests exist and realize which ones fit in each situation. In addition, the article addresses the life cycle and levels as sociated with software testing. In terms of test automation, there are some tools for developing this type of test, referencing the Katalon stu- diom robot framework, Protractoe and Watir; each is framed in different practical situations.info:eu-repo/semantics/publishedVersio

Acute lower Limb Ischemia Caused by Fungal Infective Atrial Thrombus: A Case Report

Introduction: Septic thromboemboli have two consequences, ischemic and infection. In this paper we discuss a case with acute lower limb ischemia caused by fungal infective atrial thrombus. The patient underwent an anticoagulant therapy. Case presentation:                 A 43-year-old female patient who suffered from valvular heart disease (history of mitral and tricuspid valve replacement) was referred to the vascular surgery department of Modarres hospital with acute left limb ischemia. She underwent a successful emergency surgical thrombectomy. The pathological report of thrombus demonstrated fungal infection.  Conclusion: After surgical thrombectomy to control the acute lower limb ischemia, antimicrobial treatment of septic emboli is necessary