With rapidly depleting fossil fuels and growing environmental alarms due to their usage, hydrogen as an energy vector provides a clean sustainable solution. However, the challenge lies in replacing mature fuel technology with efficient economical production. This paper techno-economic, overview of H2 production technologies. Reforming is still considered backbone large-scale Whereas renewable has technically advanced improved, its cost remains area concern. Finding alternative catalytic...

Energy management strategy (EMS) has a great impact on securing fuel cell durability, battery charge sustenance, and saving in hybrid electric vehicles (FCHEVs). This study aims to develop EMS that can be applied real-time satisfy above conditions. Real time power separation was performed using rule-based EMS. A genetic algorithm (GA) implemented calculate the optimal charge/discharge criterion simultaneously satisfies minimum hydrogen consumption rate, rate preservation, high efficiency....

The importance of miRNAs in the progression prostate cancer (PCa) has further been supported by finding that have identified as potential oncogenes or tumor suppressors PCa. Indeed, eukaryotes, found to regulate and control gene expression degrading mRNA at post-transcriptional level. In this study, we investigated miR-34 family members, miR-34b miR-34c, different PCa cell lines, discussed molecular mechanism invasion migration cells vitro. difference analyses transcriptome between DU145 PC3...

Time transfer using global navigation satellite system (GNSS) is a primary method of remote atomic clock comparisons. As today, there are four operational GNSS systems, namely GPS, GLONASS, Galileo and BeiDou Navigation Satellite System (BDS or BeiDou). All them can continuously provide position, time services. This paper mainly focuses on the progress at National Service Center, Chinese Academy Sciences (NTSC). In order to realize common view (CV) comparison, we developed Rinex2CGGTTS...

This paper examined system identification using grey-box model estimation and position-tracking control for an electro-hydraulic servo (EHSS) hybrid controller composed of proportional-integral (PIC) predictive (MPC). The nonlinear EHSS is represented by differential equations. We identify parameters verify their accuracy against experimental data in MATLAB to evaluate the validity this mathematical model. To guarantee improved performance precision cylinder position, we propose a PIC MPC....

The BeiDou global navigation satellite system (BDS-3) was formally commissioned to provide positioning, velocity, and timing services users on 31 July 2020. We analyzed its pseudorange measurement noise, the precision of conventional common view (CV) all-in-view (AV) time comparison, instability precise point positioning (PPP) transfer assess performance BDS-3. found that elevation-dependent biases in BDS-2 code measurements are mitigated BDS-3 satellites is over 50% higher than satellites....

The grey system and forecast are being increasingly widely used. As we know, a could be white of which all the information can known, or black none not known. An atomic clock is, in fact, system. We only know historical it, whereas there is some uncertain for future. In order to predict trend an clock, linear model non-linear used frequently, but this paper new named dynamic grey-autoregressive studied. Compared with older methods, dominance discussed paper, finally, method velocity caesium...

The evaluation of Beidou system time is one the important tasks in constructing and developing satellite navigation system. methods based on two-way frequency transfer method (TWSTFT) GPS common-view are proposed this paper. Tests performance (BDT) were conducted. Results show that BDT stable reliable. deviation, Allan deviations clock offsets, relative to UTC (NTSC), 10e-14, 10e-15 less than 30 ns respectively.

In this research, voltage regulation of a DC-DC buck converter is realised via the ripple-free deadbeat control (RFDBC) with equivalent input disturbance observer (EIDO). A small-signal state-space model constructed for RFDBC design converter. Faced mismatched models, unknown parameter perturbation, and time-varying source load demands, augmented state extended utilised to estimate accurately. Based on model, EIDO proposed evaluate affecting channel. Disturbance compensation analysed in...

Through the research of image preprocessing technology, this paper designs and implements a web archive file recognition management system based on open source Tesseract character technology. The first preprocesses with grayscale binarization. Secondly, in order to improve accuracy handwritten content, we trained text library Tesseract. Finally, characters are recognized stored for later use. Archivists can use convert documents into electronic documents, which significantly level digital...

This study analysed the output voltage control and performance of a DC–DC boost converter. The focus is on continuous conduction mode converter each component designed selected for circuit assembly. A small-signal AC model based pulse-width modulated constructed, four algorithms, namely -integral control, deadbeat linear quadratic regulator conventional active disturbance rejection new compensated are put forward to regulate when faced with immeasurable input load disturbance. paper...

GPS/GLONASS Common view, all in view and PPP Time Transfer technology are widely used the remote time comparison. With benefit of high precise measurement on carrier phase, transfer which based phase data has been International comparison for TAI computation. In this Paper, The Carrier Phase BeiDou Navigation satellite system (BDS) is implemented. referenced with GPS method Precise Point Position (PPP) combined dual-frequency observation from Satellite system. broadcast ephemeris orbits...

The advantage of a hydrogen maser is in its short-term stability, however, with the same masers, their performance are different. In 2004, four masers were bought to time keeping laboratory NTSC, two which made USA, and other China. order make full use it necessary study includes long-term noise, frequency drift etc. Through exhaustive analysis one could exactly know different performances, consequently methods be studied when they participate calculation local atomic (TA). this paper,...

The satellite common view method is a commonly used technique in time transfer. As we known, the satellites are often MEO which belong to GNSS, but it little application for GEO navigation In this paper, introduced, then of how use transfer discussed details. Through calculation position, ionospheric delay correction, tropospheric correction and relativistic effect etc differences between reference pair stations clock obtained, furthermore, difference two can be calculated. After discussion,...

National Time Service Center, Chinese Academy of Sciences(NTSC) has taken the charge national standard time UTC(NTSC). The difference between UTC(NTSC) and UTC not exceeded ±20ns ever since 2012, which is notable achievements in high precision time-keeping. But short-term(<;5 d) stability poor, robustness accuracy also what we want to improve, therefore a hydrogen maser used as master clock instead cesium clock, Hydrogen clocks usually exhibits apparent frequency drift. To handle this...

A dynamic model of mastering for multilevel run-length limited read-only disc is built, and corresponding experiments on DVD are done to validate it. Results show that this consists with real process. Using the model, a preliminary write strategy 4-level calculated out. The readout signals optimizing by very close desired.

A new method of Common-view time transfer with mode(TCV for abbreviation) via GEO telecommunication satellite is put forward, which we can the standard kept in a keeping laboratory, such as UTC (NTSC), to many users local area covered by satellite's signal. The laboratory equipped transmitting device and receiving device, their external reference from main clock lab. pseudo-code ranging signal generated lab, transmitted paraboloidal antenna, then broadcasted earth satellite. pseudo-range...

In order to get a small-sized pit, the reaction threshold of photoresist is enhanced by increasing prebake temperature and time. With improved photoresist, pit size corresponding or even smaller than minimum on blue laser disc can be obtained an industrial DVD product line. The may serve as master material future multilevel discs, which might provide potential solution for fabrication discs.