Differential of a signal is required for high-performance motion control and many other fields. Nonlinear tracking differentiator (NTD) feasible solution; however, it limited in achieving better practical effect because the problem phase lags. This paper proposes new idea design with feedforward. By feedforward an input solving equations differentiator, differential estimate more accurate. The proposal simple; provides additional freedom differentiator. extends theoretical structure NTD....

To assess the impact of marine environment on community fish eggs in Daya Bay, we collected egg samples across four seasons during 2022. A total 51 species were gathered. The exhibited significant seasonal and spatial variations. number was highest spring lowest winter, while overall abundance peaked summer. from large economic (Sparidae) showed a declining trend; however small pelagic (Leiognathidae, Engraulidae) have become dominant over time. Spatially, higher is observed inner bay...

Microalgae blooms are a frequent occurrence in coastal waters worldwide. It is reasonable to assume that these have various influences on bacterial communities, which turn may affect the development and dissipation of bloom. However, community characteristics, particularly attached bacteria, associated with microalgae remain unclear. In this study, we investigated profiles bacteria using high-throughput sequencing during Phaeocystis globosa bloom Mirs Bay, southern China, January 2021....

The traditional sorting algorithm of median filtering is optimized according to the hardware structure features FPGA. FPGA used acquire data parallelly for comparing same column in window. Comparing results shared by adjacent filter window are saved temporarily match new round using internal resources. This method can reduce times from current 21 down 13, and improve efficiency nearly 40%.The experimental prove that a 1K × gray-level image about 20ms, which ensure proposed be applied...

Creseis acicula is a swimming shelled pteropod species, widely distributed in the world’s oceans. In 2020, an unprecedented bloom of C. was observed Daya Bay, and lasted from June to July. To date, there very limited information on physiological characteristics this which essential understand dynamics. present study, performances response temperature (17–35°C) salinity (18–38 ppt) were investigated. The oxygen consumption (OCR) calcification rates (CR) peaked at 32 26°C, respectively, while...

Effective conservation and management of Bar-headed Geese (Anser indicus) require data to determine migration routes identify key sites for protection. Ten were banded with satellite transmitters at Qinghai Lake in western China July 2006 2007 their routes. Of the tagged geese, eight left began autumn migration. these eight, four completed migration, lasting 50 90 days, using one two wintering grounds near Caohai Guizhou Province, Yarlung Zangbo valley Tibet, Kohima India. The geese each...

As a rocky reef species, Oplegnathus fasciatus displays significant geographic differences that may be congruent with patterns of molecular variation. We used 10 polymorphism microsatellite loci to characterize the genetic structure and test impact ocean currents Yangtze River on population connectivity rock bream, O. fasciatus, sampled from Jiaonan (JN), Zhoushan (ZS) Taiwan (TW). The average number alleles was 17.78, total 160 alleles, allele value in East China Sea (ZS = 13.70) higher...

Changes in zooplankton composition, abundance, and some species response to environmental variation were investigated over four seasons (2020) Daya Bay. In total, 129 taxa of (16 groups planktonic larvae 20 indeterminate species) identified. Zooplankton communities exhibited a significant seasonal shift abundance taxonomic composition. The maximum number was recorded winter (72 the lowest spring (42 species). However, highest (1,372.01 ± 1,071.14 individuals/m³) autumn (50.93 34.05...

The forest ecosystem plays a significant role in long-term carbon sequestration. magnitude of sink is determined by the combination intrinsic biotic factors (i.e. age) and extrinsic environmental driving temperature, precipitation, nitrogen deposition). mechanism how age affects balance still unclear. Furthermore, useful surrogate variable for analyses impact disturbances on an important parameter assessing mitigation potential forests at regional scale. Without considering age, large...

One of the most crucial task terrestrial audio broadcasting is transition to digital system and infrastructure. In this paper, china radio (CDR) structure presented including framing structure, transfer mode, as well spectrum mode. addition, paper gives a comprehensive introduction deployment CDR technology in China.

To investigate the radioactivity levels of seawater, sediments, and biota in Daya Bay sea area, China, order to establish baseline values, provide basic data for assessment potential radiological risks that might result from application nuclear technology or human activities. Samples were collected area analyzed. Their then compared with information other regions China around world reported related literature. For seawater samples, activity concentrations natural radionuclide 40K 9.9–10.4...

Creseis acicula is a pteropod species, widely distributed in the world's ocean. The latest report of its bloom was Mediterranean Sea 1990. On June 12, 2020, an unprecedented C. observed Daya Bay, China, that lasted for over month and caused economic losses. maximum abundance up to 5595 ind. m-3, 1000 times local record high, 10 highest number recorded elsewhere. Higher (≥ m-3) found warm water ≥ 30℃ along southwest shore Bay. initiation matched sharp increase temperature chlorophyll abrupt...

As a member of Sciaenidae, Chinese bahaba (Bahaba taipingensis) generate sounds using sonic muscles to drive the swim bladder. In this study, drumming in two groups differing body size were recorded an indoor aquarium and outdoor pond. A piecewise exponential oscillation function was developed synthesize signals with good agreement. Statistical comparisons found that frequency damping coefficient (part 1) synthesized from larger-sized fish lower. The results suggest acoustic characteristics...

With a growing number of large-scale new energy sources integrating to grid in China, it is necessary investigate the fault characteristics grid. Fault an actual wind farm with full power inverted (FPI) inside were analysed based on its recorded data, current features outgoing line and collector lines investigated, respectively. Next, calculation model for FPI under low-voltage ride through strategy was proposed, comprehensive analysis control system sources, where response loop limiter...

China has promulgated a national standard for digital terrestrial television (DTT) transmission systems in 2006. In order to save radio frequency resources effectively, the current DTT single network (SFN) been widely used. The successful establishing of SFN requires frequency, time, and bits synchronization, however, vast territory, programs broadcast by TV stations different places are different. Therefore, coverage must take into account needs national, provincial, prefecture-level,...

The girder end region is one of the weak points affecting operational stability and safety on kilometer-level railway bridges, featuring continuous track irregularities spanning over tens meters, often suffering from substandard ballast quality. Addressing two issues, taking a span suspension bridge as case, local characteristics dynamic were analyzed at regions long-span bridges. First, distribution was based results special tests conducted under extreme environmental temperatures. Then,...