A nanogapped hysteresis-free field-effect transistor

We propose a semi-suspended device structure and construct nanogapped, hysteresis-free field-effect transistors (FETs), based on the van der Waals stacking technique. The structure, which features a semi-suspended channel above a submicron-long wedge-like nanogap, is fulfilled by transferring ultraclean BN-supported MoS$_2$ channels directly onto dielectric-spaced vertical source/drain stacks. Electronic characterization and analyses reveal a high overall device quality, including ultraclean channel interfaces, negligible electrical scanning hysteresis, and Ohmic contacts in the structures. The unique hollow FET structure holds the potential for exploiting reliable electronics, as well as nanofluid and pressure sensors.Comment: 22 pages, 4 figures, with S

Coordination contracts of dual-channel with cooperation advertising in closed-loop supply chains

On the background of an online/offline dual channel, this paper studies contract coordination of centralized and decentralized dual-channel closed-loop supply chains. With the feature of recycle rate fluctuation, we develop a revenue-sharing mechanism by taking the relationship between the recycle rate and the recycle revenue sharing ratio into consideration. After comparing of centralized decision and the manufacturing led decentralized decision, the optimal online/offline price, wholesale price and advertising investment are derived. The influence of revenue sharing ratio in forward and reverse channels on the online/offline prices and wholesale prices is discussed. The numeric example is used for observing the relationship between variables, and between the optimal profit and variables through analysis of changing parameter valuations

ASTF: Visual Abstractions of Time-Varying Patterns in Radio Signals

A time-frequency diagram is a commonly used visualization for observing the time-frequency distribution of radio signals and analyzing their time-varying patterns of communication states in radio monitoring and management. While it excels when performing short-term signal analyses, it becomes inadaptable for long-term signal analyses because it cannot adequately depict signal time-varying patterns in a large time span on a space-limited screen. This research thus presents an abstract signal time-frequency (ASTF) diagram to address this problem. In the diagram design, a visual abstraction method is proposed to visually encode signal communication state changes in time slices. A time segmentation algorithm is proposed to divide a large time span into time slices.Three new quantified metrics and a loss function are defined to ensure the preservation of important time-varying information in the time segmentation. An algorithm performance experiment and a user study are conducted to evaluate the effectiveness of the diagram for long-term signal analyses.Comment: 11 pages, 9 figure

Droplet Size Spatial Distribution Model of Liquid Jets Injected into Subsonic Crossflow

Liquid jet injected into transverse subsonic gaseous flow has been widely utilized in many industrial applications. It is useful to determine the spatial distribution of generated droplets in the near-field region for high-efficiency combustion. In this paper, we propose a simplified model to predict droplet spatial distribution in transverse subsonic gaseous flow. Linear stability analysis has been used to determine the disturbance growth rate on the surface of a liquid column. When the amplitude of disturbance is of the same order of magnitude as jet radius, the liquid jet breaks up into ligaments. We can make an assumption that the generation rate of small droplet equals to liquid breakup rates, which varies with a spatial location under this circumstance. Combining these relations with the definition of SMD (Sauter mean diameter), a semitheoretical relation to evaluate droplet spatial distribution along the liquid column can be established. The present model has been compared with empirical relation based on experiments under different conditions. Results indicate that in the surface breakup region, the current model shows great consistency with experimental observations while there exists a relatively large discrepancy between the current model and experimental observation in the column breakup region because of its strong nonlinear effect near the breakup point. In addition, the effects of flow parameters on droplet size spatial distribution have been investigated

A comprehensive ensemble model for comparing the allosteric effect of ordered and disordered proteins.

Intrinsically disordered proteins/regions (IDPs/IDRs) are prevalent in allosteric regulation. It was previously thought that intrinsic disorder is favorable for maximizing the allosteric coupling. Here, we propose a comprehensive ensemble model to compare the roles of both order-order transition and disorder-order transition in allosteric effect. It is revealed that the MWC pathway (order-order transition) has a higher probability than the EAM pathway (disorder-order transition) in allostery, suggesting a complicated role of IDPs/IDRs in regulatory proteins. In addition, an analytic formula for the maximal allosteric coupling response is obtained, which shows that too stable or too unstable state is unfavorable to endow allostery, and is thus helpful for rational design of allosteric drugs

Dynamic Evolutionary Analysis of the Impact of Outward Foreign Direct Investment on Green Innovation Heterogeneity—From the Perspective of Binary Innovation

In the current era of increasingly frequent international exchanges and countries’ increasing emphasis on green development, exploring the complex relationship between outward foreign direct investment (OFDI) and green innovation has become an important research topic. Taking the binary innovation perspective as an entry point, this paper is devoted to exploring the heterogeneous impact and dynamic evolution of OFDI on green innovation since China’s accession to the WTO. The purpose is to form a more comprehensive and specific understanding of how OFDI affects green innovation. By sorting out the characteristics of economic development at the early stage of China’s WTO accession and implementation of the “going out” strategy, the period of counter-trend growth of OFDI after the financial crisis, and the “new normal” period of China’s transformation and development, this paper analyzes in detail the impact of OFDI on green innovation and green binary innovation in each stage. According to the study, the coefficients of the effects of OFDI on green innovation in the three stages are 0.214 (fully significant at the 1% level), −0.057 (insignificant), and 0.137 (significant at the 5% level), showing an overall effect of promoting–insignificant–promoting; In addition, the fact that the development orientation of OFDI is different at different stages leads to significant heterogeneity in its impact on green innovation and green binary innovation. The coefficients of OFDI on green exploratory innovation at the three stages are 0.064 (insignificant), −0.107 (significant at 10% level), and 0.099 (significant at 5% level), and the coefficients of OFDI on green exploitative innovation are 0.258 (fully significant at 1% level), −0.036 (insignificant) and 0.142 (significant at 5% level), respectively. The results reveal that OFDI on green binary innovation shifts from focusing on promoting green exploitative innovation to taking green binary innovation into account, and this heterogeneous performance effect matches the development characteristics of each stage. The results of the study show more clearly the association between OFDI and green innovation in China and provide new references for subsequent academic research and management practice

A compact readout platform for spectral-optical sensors

The continuous monitoring of industrial and environmental processes is becoming an increasingly important aspect with both economic and societal impact. So far, spectral-optical sensors with their outstanding properties in terms of sensitivity and reliability have not been considered as a potential solution because of the cost-intensive and bulky readout hardware. Here we present a card-size, in expensive, and robust readout platform based on a wavelength-sensitive photodiode. In test and characterization experiments we achieved a wavelength shift resolution of better than 0.1 nm and a detection limit of 0.001 AU for ratiometric measurements. We furthermore discuss the capability and current limitations of our readout unit in context with interrogation experiments we performed with a photonic crystal-based fluid sensor. In sum we expect the presented readout platform to foster the exploitation of spectral-optical sensor technology for gas monitoring, chemical analytics, biosensing and many others fields

Optimization Strategy for Line Loss Reduction of Distribution Network Based on Multi-distributed Photovoltaic Access

The number of distributed photovoltaic power generation systems connected to the system is increasing, especially for residents and non-residents. A large amount of photovoltaic grid-connected power brings new problems to the line loss management of the distribution network. This paper proposes a theoretical calculation model of line loss for distribution network with multi-distributed photovoltaic access. This paper adopts the actual case of Shanghai Power Grid, calculates based on the mathematical model proposed, and puts forward targeted optimization suggestions by comparing the simulation analysis results