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ИНФОРМАТИКА учебно помагало
(Химикотехнологичен и металургичен университет - София, 2024-06-03) Димитър Пилев
Учебното помагало е е предназначено за студентите бакалаври, специалности "Химично инженерство","Биомедицинско инженерство", "Биотехнологии","Инженерна екология и опазване на околната среда", "Индустриален мениджмънт","Биопродуктово инженерство, хартия и опаковки“, „Горива и биоенергийни технологии“, "Индустриална безопасност", "Неорганични и електрохимични технологии и защита от корозия", "Парфюмерия и козметика", "Полимерно инженерство", "Технология на стъклото, керамиката и свързващите вещества", "Фин органичен синтез", "Чиста енергия и устойчиво развитие","Биоматериали за приложение в медицината", "Инженерни материали и материалознание","Дигитални технологии в металургията", "Енергийна и екологична ефективност в металургията", "Металургия" и "Рециклиране на метали и сплави". на ХТМУ – София. Учебният материал е съобразен с учебния план, включващ 30 ч. лекции и 30 ч. упражнения.
Помагалото може да бъде полезно за всеки, който се интересува от встъпителен курс по Информатика
REDUCING THE CARBON FOOTPRINT IN THE CONSTRUCTION SECTOR BY REPLACING CERAMIC BRICKS WITH ALTERNATIVE MATERIALS
(2024-01-01) Tashkov L.; Zlateva P.; Penkova N.
The use of non-fired materials with additives of vegetable waste instead of traditional building ceramics reduces the energy input and the carbon footprint in the construction sector. This applies to one- and two-story buildings due to the lower load-bearing capacity of non-fired bricks. A possibility for substitution of the fired ceramics with non-fired clay bricks with additives of straw at the building of the walls of a single-family house is analyzed. The subsequent reductions of the embodied energy, carbon dioxide, and thermal losses of the buildings are determined.
ENHANCING SURFACE CHARACTERISTICS OF AA2024-T3 AIRCRAFT ALLOY THROUGH SYNERGISTIC ANODIZATION AND CERIUM CONVERSION COATING. PART I: PERFORMANCE IN MODEL CORROSIVE MEDIUM
(2024-01-01) Portolesi S.; Girginov C.; Kozhukharov S.; Lilova V.; Petkov P.
The present study is devoted to the monitoring of the performance of AA2024-T3 specimens, after the formation of Anodic Aluminum Oxide (AAO) layer and/or deposition of a Ceruim Conversion Coating (CeCC), obtained at 20°C and 50°C, respectively. Although both methods are well described in the literature, there is no sufficient information regarding the effect of their combination on their behaviour in corrosive media. The performance of the respective specimens was elucidated after 24 h of exposure to 3.5 % NaCl model corrosive medium (MCM) by means of Electrochemical Impedance Spectroscopy (EIS) and acquisition of Potentiodynamic Scanning (PDS) curves. Since the combined AAO/CeCC coating primers revealed superior barrier properties, the respective specimens were subjected to long-term corrosion tests of up to 672 h of exposure to the MCM to evaluate their durability. The results revealed the synergistic effect of the combination of the surface treatment procedures on effective corrosion mitigation.
Novel Peptide Analogues of Valorphin-Conjugated 1,8-Naphthalimide as Photodynamic Antimicrobial Agent in Solution and on Cotton Fabric
(2024-11-01) Staneva D.; Todorov P.; Georgieva S.; Peneva P.; Grabchev I.
For the first time, N-modified analogues of VV-hemorphin-5 (Valorphin) were synthesised and conjugated with three different 4-substitured-1,8-naphthalimides (H-NVal without substituent, Cl-NVal with chloro-substituent, and NO2-NVal with nitro-substituent). Cotton fabric was modified with these peptides by soaking it in their ethanol solution, and the colourimetric properties of the obtained fabric were measured. The fluorescent analysis shows that peptide immobilisation on a solid matrix as fabric decreases the molecule flexibility and spectrum maxima shift bathocromically with the appearance of a vibrational structure. The peptides’ contact antimicrobial activity, and the resulting fabrics, have been investigated against model Gram-positive B. cereus and Gram-negative P. aeruginos bacteria. For the first time, the influence of light on bacterial inactivation was investigated by antibacterial photodynamic therapy of similar peptides. Slightly more pronounced activity in liquid media and after deposition on the cotton fabric was obtained for the peptide containing 4-nitro-1,8-naphthalimide compared to the other two peptides. Immobilisation of a peptide on the surface of fibres reduces their antimicrobial activity since their mobility is essential for good contact with bacteria. Cotton fabrics can be used in medical practice to produce antibacterial dressings and materials.
Effect of extraction methods on polyphenols, flavonoids, mineral elements, and biological activities of essential oil and extracts of mentha pulegium l.
(2022-01-01) Messaoudi M.; Rebiai A.; Sawicka B.; Atanassova M.; Ouakouak H.; Larkem I.; Egbuna C.; Awuchi C.G.; Boubekeur S.; Ferhat M.A.; Begaa S.; Benchikha N.
Our study evaluated the in vitro antioxidant properties, antibacterial and antifungal activities, anti-inflammatory properties, and chemical composition of the essential oils (EOs), total phenol, and total flavonoid of wild Mentha pulegium L. This study also determined the mineral (nutritional and toxic) elements in the plant. The EOs were extracted using three techniques—hydro distillation (HD), steam distillation (SD), and microwave-assisted distillation (MAD)—and were analyzed using chromatography coupled with flame ionization (GC-FID) and gas chromatography attached with mass spectrometry detector (GC-MS). The antioxidant effects of the EOs were tested with 2,2-diphenyl-1-picrylhydrazyl (DPPH) and ABTS (2,2’-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid), while the antibacterial and antifungal activities of the EO and methanolic extract were tested using Staphylococcus aureus, Bacillus subtilis, Pseudomonas aeruginosa, Escherichia coli, and Candida albicans. Twenty-six compounds were identified in the essential oil, representing 97.73% of the total oil, with 0.202% yield. The major components were pulegone (74.81%), menthone (13.01%) and piperitone (3.82%). Twenty-one elements, including macro-and micro-elements (Ba, Br, Ca, Cl, Co, Cr, Cs, Eu, Fe, K, Mg, Mn, Mo, Na, Rb, Sb, Sc, Sr, Th, U and Zn), were detected using neutron activation analysis (INAA) and inductively coupled plasma optical emission spectrometry (ICP-OES), with the concentration of mineral element close to the FAO recommendation. The results show that the EOs and extracts from Mentha pulegium L. had significant antimicrobial activities against the microorganisms, including five human pathogenic bacteria, one yeast (Candida albicans), and one phytopathogenic fungi. The in vivo anti-inflammatory activities of the leaf extracts were confirmed. The results indicate that the EOs and extracts from Mentha pulegium L. have promising applications in the pharmaceutical industries, clinical applications, and in medical research.