Modern interpretation of risk factors in breast cancer of women

Breast cancer is a major public health problem, being the most common cancer diagnosed in women and accounting for more than 1 in 10 new diagnoses of cancer each year. It is the most common neoplasm of women under the age of 40 and the second leading cause of cancer death in this age group, with more frequent detection of pathogenic mutations in breast cancer susceptibility genes. Women with BRCA1 and BRCA2 mutations are about 70% more likely to develop breast cancer. The incidence is rising in most countries and it is expected to have a growing trend in the next 20 years, despite the current efforts to prevent the disease. In order to improve the survival rate, it is necessary to make a diagnosis as early as possible and to initiate the appropriate therapeutic management as soon as possible. Therefore, in order to detect breast formations, mammography screening is very important, breast density being an important factor in predicting the risk of breast cancer. Thus, the presence of high breast density represents a 4-6 times higher risk of developing breast cancer compared to women with low breast density. Aging and menopause are also risk factors for breast cancer. Hormone replacement therapy for postmenopausal women has the benefit of relieving symptoms such as hot flashes, depression or sleep disturbances, but it increases the risk of developing breast cancer

Steel and Concrete Elasto-Plastic Models at Bridges with Steel Beams Embedded in Concrete

For new railway bridges with short spans (L ≤ 35.00 m) superstructures with steel beams embedded in concrete are recommended or used, which can ensure the requirements of strength and stiffness in particular, regardless of velocity. They are built relatively easily compared to reinforced concrete structures or steel structures, they have high durability if designed, built and maintained correctly and don’t have high sensitivity to fatigue degradation in service. They are also used for road bridges when it is desired to achieve a reduced construction height

Simultaneous Influence of the Track Axis Curvature and the Support Line Obliquity at Railway Bridge Superstructures with Steel Beams Embedded in Concrete

For new railway bridges with small spans (L ≤ 35.00 m) superstructures with steel beams embedded in concrete are recommended and used, which can ensure the requirements of strength and especially stiffness, regardless of velocity

Some Investigations Performed for the Bridge Over Jiu at Aninoasa

The carrying structure of the bridge over the Jiu River at Aninoasa consists in two parallel concrete arches with variable height of the cross section, sustaining a concrete deck through vertical concrete hangers. In the time period passed since the bridge was erected, some structural elements shown damages. In order to establish the technical state of the bridge, a technical appraisement was performed and according to this, the most exposed elements to the risk of failure are the hangers

CO2 Emissions Reduction through Increasing H2 Participation in Gaseous Combustible—Condensing Boilers Functional Response

Considering the imperative reduction in CO2 emissions, both from household heating and hot water producing facilities, one of the mainstream directions is to reduce hydrocarbons in combustibles by replacing them with hydrogen. The authors analyze condensing boilers operating when hydrogen is mixed with standard gaseous fuel (CH4). The hydrogen (H2) volumetric participation in the mixture is considered to vary in the range of 0 to 20%. The operation of the condensing boilers will be numerically modeled by computational programs and prior validated by experimental studies concluded in a European Certified Laboratory. The study concluded that an increase in the combustible flow with 16% will compensate the maximum H2 concentration situation with no other implications on the boiler’s thermal efficiency, together with a decrease in CO2 emissions by approximately 7%. By assuming 0.9 (to/year/boiler), the value of CO2 emissions reduction for the condensing boiler determined in the paper, and extrapolating it for the estimated number of boilers to be sold for the period 2019–2024, a 254,700-ton CO2/year reduction resulted

CO₂ Emissions Reduction through Increasing H₂ Participation in Gaseous Combustible—Condensing Boilers Functional Response

Considering the imperative reduction in CO2 emissions, both from household heating and hot water producing facilities, one of the mainstream directions is to reduce hydrocarbons in combustibles by replacing them with hydrogen. The authors analyze condensing boilers operating when hydrogen is mixed with standard gaseous fuel (CH4). The hydrogen (H2) volumetric participation in the mixture is considered to vary in the range of 0 to 20%. The operation of the condensing boilers will be numerically modeled by computational programs and prior validated by experimental studies concluded in a European Certified Laboratory. The study concluded that an increase in the combustible flow with 16% will compensate the maximum H2 concentration situation with no other implications on the boiler’s thermal efficiency, together with a decrease in CO2 emissions by approximately 7%. By assuming 0.9 (to/year/boiler), the value of CO2 emissions reduction for the condensing boiler determined in the paper, and extrapolating it for the estimated number of boilers to be sold for the period 2019–2024, a 254,700-ton CO2/year reduction resulted

The Direct Effect of Enriching the Gaseous Combustible with 23% Hydrogen in Condensing Boilers’ Operation

Following the international trend of using hydrogen as combustible in many industry branches, this paper investigates the impact of mixing methane gas with 23% hydrogen (G222) on condensing boilers’ operation. After modeling and testing several boilers with heat exchange surface different designs, the authors gathered enough information to introduce a new concept, namely High-Performance Condensing Boiler (HPCB). All the boilers that fit into this approach have the same operational parameters at nominal heat load, including the CO2 concentrations in flue gases. After testing a flattened pipes condensing boiler, a CO2 emission reduction coefficient of 1.1 was determined when converting from methane gas to G222 as combustible. Thus, by inserting into the national grid a G222 mixture, an important reduction in greenhouse gases can be achieved. For a 28 kW condensing boiler, the annual reduction in CO2 emissions averages 1.26 tons, value which was experimentally obtained and is consistent with the theoretical evaluation