Using satellite-based stereo images to derive DSM (digital surface model) is a conventional and low-cost mean to estimate building height in the urban area. However, there are still knowledge gaps in the feasibility, accuracy, and limitations in a practical application scenario. This study aims at exploring the accuracy of satellite-borne along-track stereo-images in height estimation, and also validating the potentials in an urban redevelopment area. Based on the theory of analytical aerial triangulation in photogrammetry, DSM extraction was implemented with ENVI software. Actual building height data were compared with the estimations in six test sites of redevelopment areas where the old factory, urban village, and old downtown were located. The height information was assigned to building boundary by zonal statistics. Assessment strategy was based on 1:1 line comparison, bias and root mean square error (RMSE). Results of accuracy assessment indicated that height estimated from old factory area performed the best. The performance of accuracy could be presumably related to building structure, spatial arrangement, and spacing among buildings. This study gave an application-based case study of building height estimation in urban built-up areas, discussion regarding the difficulties, limitations, and further direction on accuracy improvement were pointed out.
Boron carbide is a product used for reinforcement in composite production and frequently used in the defense industry. The fact that boron carbide behaves similarly to the mechanical properties of bone and that titanium is strengthened with boron carbide, which is used as a biomaterial, causes it to be preferred among composite materials. It also makes it attractive to use in industrial applications at high temperatures. It is known that Fe-B4C composites are used together with Fe matrix materials to improve the properties of the group in addition to elements such as Cr, especially Ti, Co, Mo and Fe in various application areas. This makes it frequently used in the sintering process.
Background: Psoriasis is a chronic disease with extensive and disfiguring lesions. Psoriasis patients often present with physical disability, social embarrassment and psychological disorders. \nObjective: The aim of this study was to determine the prevalence and associated factors of depression and anxiety in psoriasis patients in the Fez-Meknes region. \nMaterials and methods: This is a cross-sectional study conducted at the dermatology department of the Hassan II University Hospital in Fez between September 2019 and December 2020 on a sample of patients followed for psoriasis. The data was collected using a questionnaire that included items on sociodemographic characteristics and illness, as well as the HADS questionnaire for psychiatric screening. We used Chi-2 test to compare percentages to identify factors related to psychiatric diseases and binary logistic regression to adjust for identified factors. Data were entered into Excel 2010 and analysed using Epi info version 7.2.3.\nResults: A total of 133 participants were included, the majority of whom were male 146 (52.6%), with an average age of 42.9 years (SD 16.1), high school educated 44 (33.1%), married 84 (63.2%), and with low socioeconomic status 89 (66.9%). Less than 10 years of disease progression was noted in 83 (62.3%). The prevalence of depression was 28.6% and anxiety 41.4%. Multivariate analysis showed the factors susceptible to have depression or anxiety were older age, female gender, married status, and high affected body surface area for depression and only female gender and married status for anxiety.\nConclusion: We found a high frequency of psychiatric pathologies in patients with psoriasis, with anxiety being more frequent than depression. Our results suggest the importance of establishing the detection of these pathologies as a component of psoriasis care.