Activation energy

Prediction equations can be used as a useful, inexpensive, and highly accurate tool for estimating Percent Body Fat (PBF) in many countries all over the world. We conducted this study to develop new predictive equations for estimating PBF in children and adolescents aged 6 to 18 years in Ho Chi Minh City (HCMC), Vietnam.

9p vikoch 27-06-2024 3 1   Download

The paper aims to present an integrated career-based STEM lesson, "Roller Coaster Engineer," in teaching the Kinetic and Potential Energy of the 10th-grade Physics Curriculum. Based on the theoretical foundation of STEM education and career-oriented education, STEM learning activities were designed for a roller coaster engineer to increase students’ STEM career interests and foster career-oriented competence.

14p visergeyne 18-06-2024 2 0   Download

In the past, the occurrence of macro alga Ulva lactuca on the coastal areas of Jeju Island, Korea, has resulted in the expansion of devastating green tides, thus affecting coastal sustainability, aesthetic appearances, and tourism activities. This paper proposes a new strategy to investigate the potential of Ulva lactuca as a tribopositive layer for green energy harvesting in TENG applications.

9p visergeyne 18-06-2024 0 0   Download

This article deals with a review on how supercapacitor (SC) electrode materials get developed from bio-waste like cooked chicken bone waste (CCBW), chicken egg shells, fish gills, fishbone waste, and biodegradable and non-biodegradable marine wastes such as plastics, mangroves, chitosans, and mussel shells, which provide economic benefit for the substantiality of supercapacitor technology.

22p visergeyne 18-06-2024 0 0   Download

In this study, we fabricated α-Fe2O3 materials via a facile hydrothermal route to use as the active material for the anode of an iron-based battery. The particle size of α-Fe2O3 was in a range of a few hundreds of nanometers to a few micrometers.

10p viamancio 04-06-2024 3 0   Download

This book presents green cleaning in its deservedly positive light — an activity that costs nothing or next to nothing, reduces energy consumption, makes your home a healthier place, requires no fancy gadgets, and reaffirms that going green is not about sacrifice or doing without, but rather a celebration of values that bring about a meaningful, fulfilling, and joyful quality of life.

290p zizaybay1104 29-05-2024 2 2   Download

Ebook "Beyond the limits to growth: New ideas for sustainability from Japan" offers an optimistic view of the future and provides a road map for societies to get there. Drawing upon extensive research and many years as a thought leader in environmental and sustainability issues in Japan and internationally, Hiroshi Komiyama analyzes the most pressing challenges to the attainment of sustainability of economically advanced nations and argues forcefully for Japan to lead them out of the present dilemma through active promotion of creative consumer and societal demand.

131p giangdongdinh 28-05-2024 3 1   Download

Ebook "Computational support for the selection of energy saving building components" presented in this thesis consists of four main research activities, all focusing on the use of simulation tools to support the selection and implementation of energy saving building components: 1) analysis of the design process of current energy-efficient building projects; 2) development of an approach for well-founded selection of these components; 3) analysis of the suitability of existing tools to support the selection process, and development of ideas for improvement of these tools.

238p giangdongdinh 28-05-2024 1 1   Download

Continued part 1, part 2 of ebook "Design with energy: The conservation and use of energy in buildings" provides readers with contents including: Chapter 5 - Active solar heating; Chapter 6 - Space heating and ventilation; Chapter 7 - Thermal storage; Chapter 8 - Wind energy; Chapter 9 - Water-supply systems; Chapter 10 - Waste disposal and utilization;...

208p dongmelo 20-05-2024 4 1   Download

In this work, Al-doped ZnO and Fe-doped ZnO nanoparticles have been synthesized through the coprecipitationannealing method to create new and safer UV filters for sunscreen. The effects of metal doping on phase composition, crystal structure, surface morphology, specific surface area, and elemental composition were characterized by X-ray diffraction, Raman spectroscopy, field emission electron scanning microscopy, nitrogen adsorption-desorption experiments and energy-dispersive X-ray spectroscopy, respectively.

8p dianmotminh02 03-05-2024 2 1   Download

Nowadays, supercapacitors have been among popular electrochemical energy storage devices in modern life. Plenty of active materials have been investigated and developed to meet the increasing demands for high-performance supercapacitors. In this study, we introduce a facile chemical synthesis route in combination with a subsequent calcination process to fabricate the oxide/hydroxide composites of nickel (Ni) and copper (Cu) as active materials for highperformance asymmetric supercapacitors.

9p dianmotminh02 03-05-2024 3 1   Download

The experimental flux-weighted average cross section is compared with the theoretical prediction, for which the absolute cross section was calculated using the TALYS 1.95 code and the bremsstrahlung spectrum was simulated using the computer program MCNPX. The present experiment was carried out at the 100 MeV electron linac of the Pohang Accelerator Laboratory, POSTECH, Pohang, Korea.

12p dianmotminh02 03-05-2024 1 1   Download

The melting points of the complexes were >350oC, indicating high thermal stability. Cu-Zn-containing complex showed the least binding energy against the three proteins. The bioactivity scores of the complexes were between -0.50 and 0.0. Against A549 Cu-Zn, Co-Zn and Fe-Zn containing complexes showed potential activity. Against MCF-7, Fe-Cu containing complex had IC50 of 53.5 whereas Co-Zn containing complex was active against HepG2. Three complexes were active against S. aureus in the tested range.

18p dianmotminh02 03-05-2024 2 1   Download

The electronic states of FeSin −/0/+ (n = 1-2) clusters have been investigated with DFT, CASPT2, and DMRGCASPT2 methods. By using relatively large active spaces, the DMRG-CASPT2 method is found to provide highly accurate relative energies for the various relevant electronic states. Leading configurations, bond distances, harmonic vibrational frequencies, and relative energies for the low-lying states of the title clusters are reported.

9p dianmotminh02 03-05-2024 4 2   Download

Excessive unbalance of the DC capacitor voltages of the inverter can cause overvoltages on power components and capacitors, causing unintended low-order harmonics on the load side such as second harmonics, 3rd, 4th, 5th,..., causing direct harm to the motor load, reducing the controllability of the reverse voltage and filter compensating current for the active filter circuit, affect to the performance of electric vehicles (EVs).

12p viohoyo 25-04-2024 2 2   Download

Ebook "Mitochondria and cancer" presents thorough analyses of mitochondrial dysfunction as one of the hallmarks of cancer, discusses the clinical implications of mitochondrial defects in cancer, and as unique cellular targets for novel and selective anti-cancer therapy. These include differences in mitochondrial metabolic activity, molecular composition of mitochondria and mtDNA sequence, as well as in alteration of nuclear genes encoding mitochondrial proteins.

294p ladongphongthanh1008 22-04-2024 3 1   Download

Part 2 book "Advanced control of electrical drives and power electronic converters" includes content: Active power filter based on a dual converter topology, AC/DC/AC converter with power electronics current modulator used in dc circuit for renewable energy systems; power electronics inverter with a modified sigma delta modulator and an output stage based on GaN E-HEMTs;... and other contents.

235p dianmotminh00 22-04-2024 7 2   Download

In this study, we synthesized CuCoFe-LDH bilayer hydroxide catalysts in different Cu:Co:Fe ratios (1:1:1; 1:2:1, and 1:3:2) by hydrothermal method and applied them to activate peroxymonosulfate (PMS) for decomposing levofloxacin. The obtained LDH samples were characterized by X-ray diffraction, Fourier-transform infrared spectroscopy, scanning electron microscopy, and energy-dispersive X-ray spectroscopy.

12p viohoyo 25-04-2024 2 2   Download

Part 1 book "Renewable energy systems from biomass - Effciency, innovation and sustainability" includes content: Current status of renewable energy systems from biomass - global uses, acceptance, and sustainability; modeling of sustainable energy system from renewable biomass resources in response to technical development, lifecycle assessment, cost and availability; sustainable energy production from distributed renewable waste resources through major waste to energy activities,... and other contents.

133p dianmotminh00 22-04-2024 10 3   Download

Electricity is an important energy source in each country. It is also important for the development of a university. The monthly expense for the electricity bill is different as the activities in the university would affect it. Electricity tariff also changes from time to time, thus, studies regarding electricity consumption are more representative. Therefore, the objective for this study is to evaluate the performance of several forecasting models by using the four error measures to then forecast the monthly electricity consumption.

6p longtimenosee09 08-04-2024 5 1   Download