Results 21 to 30 of about 3,024,533 (298)

Evaluation of net anthropogenic nitrogen inputs in the Three Gorges Reservoir Area

open access: yesEcological Indicators, 2022
Excessive nitrogen input caused by human activities is an important factor threatening regional water security and economic development. In this study, net anthropogenic nitrogen input has offered an advantage in evaluating nitrogen input’s temporal and ...
Zhen Wang   +5 more
doaj   +1 more source

Role of H2O2 on photosynthetic characteristics of soybean genotypes under low water input

open access: yesSakarya Üniversitesi Fen Bilimleri Enstitüsü Dergisi, 2020
Soybean is subjected to abiotic stresses that immensely affect its productivity during its lifespan and threaten food security globally. Recent research recommends that chemical substances could be applied to plants as an alternative to traditional ...
Neslihan Saruhan Güler, Necla Pehlivan
doaj   +1 more source

Modified Two-Channel LLC Resonant Converter With Optimal Efficiency for Wide Input Voltage Applications

open access: yesIEEE Access, 2023
A modified two-channel LLC resonant converter with optimal efficiency for wide input voltage applications. The converter has the same voltage gain and power handing ability as conventional full-bridge (FB) resonant converter, but the hardware cost is ...
Linlin Pi
doaj   +1 more source

Multiband Asymmetric Biconical Dipole Antenna with Distributed Surface Impedance and Arbitrary Excitation

open access: yesEast European Journal of Physics
A numerical-analytical solution of a problem concerning the current distribution and input characteristics of asymmetric biconical dipole with distributed surface impedance and arbitrary excitation and derived in the thin-wire approximation.
Mikhail V. Nesterenko   +2 more
doaj   +1 more source

Input Impedance and Gain of a Gigahertz Amplifier Using a DC SQUID in a Quarter Wave Resonator

open access: yes, 2008
Due to their superior noise performance, SQUIDs are an attractive alternative to high electron mobility transistors for constructing ultra-low-noise microwave amplifiers for cryogenic use. We describe the use of a lumped element SQUID inductively coupled
Aumentado, Jose   +2 more
core   +1 more source

Input Characteristics of Electrically Thin Dipole with Variable Radius Along Antenna Length

open access: yesEast European Journal of Physics
An approximate analytical solution to the problem of radiation (diffraction) of electromagnetic waves by dipole (monopole) with variable radius along antenna length is presented.
Mikhail V. Nesterenko   +2 more
doaj   +1 more source

Characteristics of Dissolved Organic Matter in a Semi-closed Bay in Summer: Insights from Stable Isotope and Optical Analyses

open access: yesFrontiers in Marine Science, 2022
Dissolved organic matter (DOM) serves as the most active and sensitive organic component in the bay, and its biogeochemical characteristics and reactivity are affected by the properties of terrestrial and marine substances significantly.
Yafeng Zhong   +7 more
doaj   +1 more source

Radiation of Electromagnetic Waves by Regular and Biconical Dipoles with Variable Distributed Surface Impedance and Arbitrary Excitation

open access: yesEast European Journal of Physics
An approximate analytical solution of a problem concerning the radiation of electromagnetic waves by regular and biconical dipoles with constant and variable complex distributed surface impedance and arbitrary excitation is derived.
Mikhail V. Nesterenko   +3 more
doaj   +1 more source

Straw input can parallelly influence the bacterial and chemical characteristics of maize rhizosphere

open access: yesEnvironmental Pollutants & Bioavailability, 2020
The effects of straw input, including three strategies: chopped straw, straw-derived compost and biochar, on bacterial communities and chemical composition in maize rhizosphere were investigated according to a three-year field experiment.
Rong Li, Jun Liu, Jiani Li, Caixia Sun
doaj   +1 more source

On Decomposition-Based Surrogate-Assisted Optimization of Leaky Wave Antenna Input Characteristics for Beam Scanning Applications

open access: yesIEEE Access, 2021
Recent years have witnessed a growing interest in reconfigurable antenna systems. Travelling wave antennas (TWAs) and leaky wave antennas (LWAs) are representative examples of structures featuring a great level of flexibility (e.g., straightforward ...
Mehmet Ali Belen   +4 more
doaj   +1 more source

Home - About - Disclaimer - Privacy