Search Results - Xia FENG

Partial nitrification of ammonia-containing wastewater can save energy and reduce cost, and has become one of the hotspots in the research of biological nitrogen removal from wastewater. The principle of partial nitrification and the merits of a new process based on that principle were analyzed, eff...

Full description

Quantitative and qualitative analyses were conducted on the relationship between aerobic biodegradability and chemical structure of phthalic acid ester compounds by applying the quantitative structure-activity relationship (QSAR). The quantitative relationship equation between aerobic biodegradation...

Full description

Ten phthalic acid esters (PAEs) were tested anaerobically to assess their potential for biogas production. Results showed that biogas production decreased with the increasing alkyl chain length of PAEs resulting in its increased half-life. The equation between net biogas production and atomic number...

Full description

In this paper, an integrated polarization-insensitive optical comb filter with flat passband and tunable central wavelength is designed based on cascaded Mach–Zehnder structure. It is realized by employing three specific directional couplers with square waveguides. The central wavelength...

Full description

A photonic method to generate hybrid binary digitally modulated radio frequency (RF) signals (i.e. ASK, PSK, and FSK) by using a polarization-division-multiplexed Mach-Zehnder modulator (PDM-MZM) is proposed. The PDM-MZM is driven by two RF signals with different carrier frequencies and two multipli...

Full description

<h4>Background</h4>Pulmonary embolism (PE) is a potentially life-threatening condition. Although computed tomography pulmonary angiography (CTPA) is the reference standard for diagnosis, its early diagnosis remains a challenge, and the concerns about the radiation exposures further limit...

Full description

Polarization-beam-splitters with both broadband operation window and high extinction ratio are highly desirable in optical communication systems. In this paper, a compact noncascaded-directional-couplers PBS with an ultrahigh extinction ratio and low excess loss is proposed. The PBS utilizes an asym...

Full description

The minimization of polarization multiplexing angle in a polarization-division-multiplexed (PDM) transmission system is explored. An effective polarization demultiplexing algorithm based on Stokes space is proposed to realize the demultiplexing of two nonorthogonal polarization states. Both simulati...

Full description

A photonic scheme to generate a 4-level frequency hopping (FH) microwave signal is proposed and experimentally demonstrated. The frequency of the generated signal can be fast and flexibly switched by shifting the combinations of two binary signals (i.e., 00, 01, 11, 10). Moreover, the carrier freque...

Full description

The insecticide chlorantraniliprole exhibits good efficacy and plays an important role in controlling the diamondback moth, Plutella xylostella Linnaeus. However, resistance to chlorantraniliprole has been observed recently in some field populations. At present study, diamondback moths with resistan...

Full description

Carboxylesterase is a multifunctional superfamily and can be found in almost all living organisms. As the metabolic enzymes, carboxylesterases are involved in insecticides resistance in insects for long time. In our previous studies, the enhanced carboxylesterase activities were found in the chloran...

Full description

Considering the absence of a widely utilized EBV vaccine, we have developed an EBV gL-gH344-Ferritin nanoparticle vaccine utilizing ferritin as a carrier. The gL-gH344-Ferritin fusion gene was synthesized and inserted into the pET30a plasmid. The expression of the fusion protein in the recombinant p...

Full description