Automated assembly sequence generation using a novel search scheme for handling parallel sub-assemblies

textThe Assembly sequencing problem (ASP) is part of the assembly planning process. The ASP is basically a large scale, combinatorial problem which is highly constrianed. The aim of this thesis is to automatically generate assembly sequence(s) for mechanical products. In this thesis, the CAD model of an assembly is represented or modeled as a label-rich graph. The assembly sequences are generated using graph grammar rules that are applied on the graph. The sequences are stored in a search tree and to find an optimal sequence multiple evaluation criteria like time, subassembly stability and accessibility measures are used. This research implements a novel tree search algorithm called "Ordered Depth First Search" (ODFS) to find an optimal assembly sequence in very low processing time. The software has successfully generated an optimized assembly sequence for an assembly with 14 parts.Operations Research and Industrial Engineerin

Matplotlib 3.0 cookbook: over 150 recipes to create highly detailed interactive visualizations using Python

This book presents highly practical, ready to implement recipes on using Python's Matplotlib package for effective data visualization. It contains quick solutions to the common and not-so-common problems encountered while designing different types of visualizations, including histograms, bar plots, and other advanced charts

Status of Waste Management in Selected Hospitals of Isfahan in 2014

Background: Hospital wastes are considered as a serious threat for public health. Hospital waste management may help to control disease transmission and have remarkable economic advantages. The purpose of this study was to assess  the hospitals' waste management in Isfahan, Iran in 2014. Methods: Data of this descriptive and cross-sectional study were collected through a check list for surveying hospital waste management. Validity of checklist was confirmed by analysis of face validity and field experts' opinions. Cronbach's alpha of 0.80 was calculated. Data were then analyzed using descriptive statistics in Excell software. Results: In the studied hospitals "Elimination" dimension was inappropriate while the "Human resources involved in waste management" dimension was estimated relatively appropriate. Other dimensions were estimated as appropriate. Infectious wastes consisted of about 10.89 % of the total wastes in hospitals and the average of waste generation for each bed was 3.67 kg per day. There was no environmental unit in the studied hospitals and only one of them did not have waste management unit. Conclusion: Despite the fact that waste management status in hospitals under study was relatively appropriate, but given the importance of the issue, it is essential to improve the current situation especially in some aspects of waste management.&nbsp

Differentiation of Murine Embryonic Stem Cells into Endothelial Cells

Objective: In this investigation Murine Embryonic Stem (ES) cells were differentiatedinto endothelial cells.Materials and Methods: Murine ES cells (CCE cell line) exposed to Alpha-MEM medium containing 10% FBS for 4 days. Then obtained Flk-1 (Flk-1:Vascular Endothelial Growth Factor Receptor 2) Positive cells were cultuted inEndothelial Growth Medium-2 (EGM-2) until the last day of experiment. Differentiatedcells were evaluated by immunocytochemistry, RT-PCR and Tube FormationAssays.Results: When the ES cells cultured in collagen coated dishes containingAlpha-MEM & FBS, Flk-1 positive cells were obtained. After transfering Flk-1positive cells into fibronectin coated dishes containing EGM2, the cells wereassumed a relatively uniform endothelial cell morphology and could be propagatedand expanded. Immunocytochemical and RT-PCR analysis of differentiatedcells showed that they take up acetylated low-density lipoprotein (LDL), express Flk-1, CD31 and bind the BS-l lectin. When placed in Matrigel, these MurineES cell–derived endothelial cells formed capillary-like structures characteristicof endothelial cellsConclusion: ES cell–derived endothelial cells provide a novel means to examine the mechanisms of endothelial cell development, and may open up new therapeutic strategies