19 research outputs found
Erratum: Correction: H<sub>2</sub> as a fuel for flavin- and H<sub>2</sub>O<sub>2</sub>-dependent biocatalytic reactions (Chemical communications (Cambridge, England) (2020))
No full textCorrection for 'H2 as a fuel for flavin- and H2O2-dependent biocatalytic reactions' by Ammar Al-Shameri et al., Chem. Commun., 2020, DOI: 10.1039/d0cc03229h.BT/Biocatalysi
Electricity supply technology for a steam power plant in Mokha City, Yemen [mini review]
No full textThis mini review evaluates the potential of electricity supply technology for a steam power station in Mokha City,
Yemen. It examines the current energy crisis, highlighting the significant gap between demand and supply. The report discusses
the benefits of modern steam power technologies, including reliability, scalability, and the potential for renewable integration.
Key challenges such as infrastructure limitations, operational costs, and political instability are also addressed. The findings
suggest that strategic investments and training are essential for enhancing energy security in the region
H<sub>2</sub>as a fuel for flavin- And H<sub>2</sub>O<sub>2</sub>-dependent biocatalytic reactions
No full textThe soluble hydrogenase from Ralstonia eutropha provides an atom efficient regeneration system for reduced flavin cofactors using H2 as an electron source. We demonstrated this system for highly selective ene-reductase-catalyzed CC-double bond reductions and monooxygenase-catalyzed epoxidation. Reactions were expanded to aerobic conditions to supply H2O2 for peroxygenase-catalyzed hydroxylations.BT/Biocatalysi
The current state and potential of alternative sources of electricity in Yemen
No full textThis study explores the current state and potential of alternative sources of electricity in Yemen, highlighting the benefits, challenges, and potential solutions for harnessing renewable energy
Influences of Earned Value Management on Construction Project's Performance in Yemen
No full textMost of projects in developing countries suffer cost overruns, behind the schedule, and bad quality due to improper monitoring and controlling technique. This study investigated the earned value management in Yemen as a monitoring and controlling technique and its relation with the project performance. The both qualitative and quantitative methods were adopted covering unstructured interview and questionnaire. This study conducted both pilot study and pre-test which led to proper instrument used in large-scale survey. Reliability and validity tests applied on the instrument which judged it to be reliable and valid. SPSS IBM 19 analysed the data showing that the Earned value has not understood due to lack of knowledge and wasn’t practiced in the site. Consequently, this led to performance failure. To overcome this issue, the academics and practitioners should study and practice earned value management in Yemen particularly, and in developing countries in general
Development of an automatic dependent surveillance broadcast modem using dataflow specifications
No full textAir traffic control nowadays mainly relies on radar based surveillance system and with the growth of air traffic, the problems of air transportation system is approaching its limit. The increase in the task of scheduling flights results in higher overall operation cost and pose higher rate of flight safety hazards. Thus, an upgrade from conventional air traffic management systems to the Next Generation Air Transportation (NextGen) System is required. The Automatic Dependent Surveillance Broadcast (ADS-B) modem is the key component of NextGen, which uses Global Navigation Satellite System (GNSS) to provide better accuracy of aircraft position. ADS-B continuously broadcasts information on altitude, position, identity, velocity, and other aircraft information to generate best picture for air traffic management. In this paper, the ADS-B modulator and demodulator have been developed using high-level RVC-CAL dataflow actor language, and automatically synthesized to C and Verilog/VHDL codes for hardware and software implementations. Results show that the performance of the proposed designs at high-level exceeds the minimum throughput requirement specified in the ADS-B standard by a factor of more than three
Harnessing a Dielectric/Plasma Photonic Crystal as an Optical Microwave Filter: Role of Defect Layers and External Magnetic Fields.
No full textWe investigate the transmittance spectrum of a multichannel filter composed of dielectric (A) and plasma (P) materials in the microwave region within the transfer matrix formalism. Two configurations of the proposed filter are studied under the influence of an applied magnetic field: (1) a periodic structure containing (A/P)N unit cells surrounded by air and (2) the introduction of a second dielectric material (D) acting as a defect layer to produce an (AP)N/2/D/(AP)N/2 structure. Our findings reveal that in the periodic case, the number of resonant states of the transmittance increases with number N; however, the observed blue and red shifts depend on the intensity and orientation of the applied magnetic field. We present contour plots of the transmission coefficients that show the effect of the incident angle on the shifts of the photonic band gaps. Furthermore, we find that the introduction of a defect layer generates additional resonant states and merges the central resonant peak into a miniband of resonances. Moreover, we show that the number of resonant peaks and their locations can be modulated by increasing the unit cell number, N, as well as increasing the width of the inserted defect layer. Our proposed structures enable the design of novel photonic filters using magnetized plasma materials operating in the microwave region
H2 as a fuel for flavin- and H2O2-dependent biocatalytic reactions
No full textThe soluble hydrogenase from Ralstonia eutropha provides an atom efficient regeneration system for reduced flavin cofactors using H2 as an electron source. We demonstrated this system for highly selective ene-reductase-catalyzed C[double bond, length as m-dash]C-double bond reductions and monooxygenase-catalyzed epoxidation. Reactions were expanded to aerobic conditions to supply H2O2 for peroxygenase-catalyzed hydroxylations.DFG, 284111627, H2-basierende Kaskaden für die Biosynthese von N-HeterocyclenDFG, 405325648, ,Engineering von O2-toleranten Hydrogenasen und ihre physiologischen Auswirkungen in rekombinanten Bakterien im Hinblick auf die Hydrogenase-abhängige NAD(P)H-Regeneration und H2-ProduktionDFG, 390540038, EXC 2008: UniSysCatTU Berlin, Open-Access-Mittel - 202
Perspectives of double skin façade systems in buildings and energy saving
No full textOne of the most important methods of saving energy in a building is by carefully designing its facade. A 'double skin façade' is optimally one of the best options in managing the interaction between the outdoors and the internal spaces. It also provides some architectural flexibility to the design. Recently it has received much attention as opposed to the more typically glazed curtain wall. This is because of its ability to efficiently reduce energy and therefore saves cost. The amount of energy saved depends on the climate and the design chosen. The design of the DSF involves decisions on geometric parameters, glass selection, ventilation strategy, shading, daylighting, aesthetics, wind loads, and maintenance and cleaning cost expectations. DSF has an impact on several aspects of the design phase of a building. For example, thermal properties, acoustic characteristics and daylighting are affected in the exploitation phase of the building. In addition, in terms of building safety point of view, fire propagation maintenance or glazing thermal break must be taken into account. Currently, little work has been done on the behaviour of DSFs in hot and humid climates. This paper shall review previous studies made on double skin façade systems (DSFS) in buildings.Buildings Double skin facade systems Applications Prospects Challenges Limitations
