Magnetism has been recently considered to be of great significance in boosting the hydrogen evolution reaction (HER) activity. In order investigate catalytic role magnetism HER, numerous...

Abstract This paper tests how quickly firms recover from the shock caused by COVID‐19 pandemic under different sourcing strategies. Our findings indicate that with geographically concentrated suppliers experience slower recovery compared to those dispersed following outbreak of pandemic. Further analysis also reveals more rapidly if their are less affected pandemic, they maintain long‐term supplier relationships, or hold higher levels cash reserves.

Fueled by the explosive growth of Web 2.0 and social media, online investment communities have become a popular venue for individual investors to interact with each other. Investor opinions extracted from capture “crowd wisdom” begun play an important role in financial markets. Existing research confirms importance crowd wisdom stock predictions, but fails investigate factors influencing performance (that is, prediction accuracy). In order help improve performance, our strives impact...

It is well known that magnetic field one of the effective tools to improve activity hydrogen evolution reaction (HER), but considering inconvenient application an external field, it essential find a ferromagnetic material with high HER itself. Fortunately, recent study has shown two-dimmention (2D) Fe

Human–computer negotiation has the potential to play an important role in today's highly dynamic online environment, especially business-to-consumer e-commerce transactions. However, lack of research on effective automated algorithms respond human buyers' strategic and/or tactic offers limited development human–computer systems for real-world applications. Intelligent software agents that are capable dynamically adjusting their strategy response can greatly improve experience buyers. In this...

Both stock recommendations from sell-side analysts and online user generated content crowds have great significance in the market. We examine compare different effects of analyst attitude crowd sentiment on prices this article with data CSMAR. By estimating a multivariate linear regression model, we find that although wisdom both experts has impact prices, latter's prevails. also adopt LightGBM, novel machine learning to predict trends based empirical results. Portfolio returns models...

At some hospitals and nursing homes, people have already thought about improving healthcare quality, efficiency accuracy by bring in the technology of wireless local area network (WLAN), which possesses advantage high mobility, flexibility speed. However, this idea always takes risk that medical equipment may get disturbed invisible electro magnetic interference (EMI). It has been proved many cases precision instruments could not work properly when they are under radiofrequency radiation. In...

Electronic shelf label system (ESLS), usually working in an infrared or radio frequency network, has been brought by some retailers order to get real time wireless updating of shelf-edge information. However, such can be realized using the existing indoor lighting infrastructure with advantages over above solutions. In this paper a new ESLS based on public illuminating network was proposed. As white light-emitting diodes (WLED) take priority conventional low luminous efficient lamps and is...

Radio frequency interference (RFI) cancellation is a main problem to be solved in High Frequency Surface Wave Radar (HFSWR) system. To minimize the impact of RFI, number signal processing techniques, such as adaptive beamforming and polarization filtering, have been developed. However, performance these conventional methods degrades lot when target interferences similar parameters within corresponding domains. According fact that usually differs with RFI more than one domain, it will...

Power and thermal considerations are becoming limiting factors for submicron circuits as technology scales down. In order to detect abnormal temperature changes so defects on chip, increase reliability service life of devices, an all CMOS sensor circuits' test is proposed. A current proportion absolute generated achieving linear temperature-dependent voltage zero coefficient voltage. voltage-to-pulse generator instead or analog- to-digital converter utilized translating into a pulse with...

Oblique projection polarization filter (OPPF) can be applied as an effective approach for interference cancellation in high-frequency surface wave radar (HFSWR) and other systems. In order to suppress the nonstationary ionosphere clutter further, a novel OPPF based suppressing scheme is proposed this paper. The characteristic of are taken into account algorithms referred range-Doppler domain suppression (RDDPS) range-time (RTDPS) method, respectively. RDDPS designed weak implemented...

Traditional approaches for interference suppression will enjoy the added benefits when more domains are involved in antenna array. However, information from range domain and its collaboration with other rarely explored, their potentials improvement of radar performance under-estimated. In this paper, we introduce concept polarization sensitive frequency diverse array (PSFDA), which combined (FDA) (PSA). This generates a range-angle-polarization resolution, provides possibility simultaneous...

This paper investigates the combined effect of horizontal partial shareholding and dual purpose concern on quantity competition. We identify type acquiring firm production quantity, consumer surplus, social welfare. The results show that may accelerate competition or mitigate competition, which depends trade‐off between competition‐softening competition‐intensifying concern. Whether society benefit from also magnitude socialresponsibility preference.

Recent fast advances in information technologies have dramatically expanded the use of mobile social apps (i.e., applications). Compared to other products or services, switching costs are lower as a user can easily switch from one app another. In order figure out factors influencing users' continuance intention and provide practical implications on building loyalty, we integrate flow experience build an empirical model. Specifically, take Wechat example investigate due its popularity China....

Ultrasonic guided wave is a new non-destructive evaluation (NDE) method since it offers the potential to quickly inspect defects along long length of welds. During mode study, shear horizontal (SH) has been discovered, which particularly attractive for NDT as non-leaky and almost non-dispersive. However, rare weld transducers have developed so far, let alone used wide commercialization. This paper develops piezoelectric transducer based on SH <sub...

Normal methods of spatial filtering may change the coherent characteristic target, which reduces effect accumulation in systems despite improvement signal-to-interference and noise ratio (SINR). To avoid amplitude phase distortion introduced by filters, null phase-shift filter (NPSF) is proposed this paper. NPSF can suppress interference while keeping original information target signal. However, performance will be influenced estimation error target's parameter. solve problem, an improved...

A generalized oblique projection (GOP) with an adjustable parameter defined as interference suppression cost (ISC) is proposed. Therefore, optional optimized signal to interference-plus-noise ratio (SINR) and user controlled actions on the filtering are presented in this GOP framework. Theoretical analysis numerical simulation demonstrate that when ISC derived from minimum variance distortionless response (MVDR) algorithm, SINR performance of filter better than both MVDR (OP) filters....

Abstract Shell and PetroChina have been successfully developing the Main Changbei P1S2 QA Reservoir using advanced technology of openhole dual lateral horizontal wells since 2005. The scope this project has expanded to further develop also appraise Unconventional tight gas Reservoirs. Reservoirs not commercially developed date are geologically very different from Reservoir. team employed front end loading decision based modelling manage complexities essentially a green field within brown...