Normative and image motivations for transportation policy compliance

Compliance with laws and regulations intended to protect common pool resources in the urban context is essential in tackling problems such as pollution and congestion. A high level of non-compliance necessitates investigation into motivations behind compliance. The long-held instrumental theory emphasising the dependence of compliance on tangible deterrence measures fails to adequately explain empirical findings. More recently established compliance models incorporate normative, instrumental and image factors as motivations for compliance. We investigate the importance of normative and image motivations for transportation policy compliance, and the influence of the hukou (China’s household registration) on the composition of motivations. Through a case study of Shanghai’s license auction policy to inhibit car growth, we use a structural equation model and data from a survey (n = 1389) of policy attitudes and compliance behaviour. The results show that both locals and migrants comply because of instrumental motivation. However, for locals, normative and image motivations not only influence compliance but do so to a greater degree than instrumental motivations. This stands in stark contrast with the fact that there was no statistical relationship between normative and image motivations and compliance for migrants. The significant contribution of normative and image motivations to compliance in locals bears positive implications for compliance, but the absence of that in migrants is worrying. If only instrumental motivations matter, then the government is really constrained in how it can go about keeping social order. Compliance obtained strictly through social control indicates an unsustainable state of governance.Massachusetts Institute of Technology. Samuel Tak Lee Real Estate Entrepreneurship Laborator

Design and Realization of On-line Enterprise Office Automation System

AbstractThis paper discusses the online business office automation system development process, office automation system requirement analysis, system function design, database design and implementation of the system is introduced, the system function and database design and realization of the system. Through the system function data flow analysis, get the logical structure of database system, and on this basis, the physical structure of database to create all kinds of information inquiry, update operation

Measuring the phonon-assisted spectral function by using a non-quilibrium three-terminal single-molecular device

The electron transport through a three-terminal single-molecular transistor (SMT) is theoretically studied. We find that the differential conductance of the third and weakly coupled terminal versus its voltage matches well with the spectral function versus the energy when certain conditions are met. Particularly, this excellent matching is maintained even for complicated structure of the phonon-assisted side peaks. Thus, this device offers an experimental approach to explore the shape of the phonon-assisted spectral function in detail. In addition we discuss the conditions of a perfect matching. The results show that at low temperatures the matching survives regardless of the bias and the energy levels of the SMT. However, at high temperatures, the matching is destroyed.Comment: 9 pages, 5 figure

In-plane noncollinear exchange coupling mediated by helical edge states in Quantum Spin Hall system

We study the Ruderman-Kittel-Kasuya-Yoshida (RKKY) interaction mediated by helical edge states in quantum spin hall system. The helical edge states induce an in-plane noncollinear exchange coupling between two local spins, in contrast to the isotropic coupling induced in normal metal. The angle between the two local spins in the ground state depends on the Fermi level. This property may be used to control the angle of spins by tuning the electric gate.Comment: 4 pages, 1 figur

Atypical sliding and Moire ferroelectricity in pure multilayer graphene

Most non-ferroelectric two-dimensional materials can be endowed with so-called sliding ferroelectricity via non-equivalent homo-bilayer stacking, which is not applicable to mono-element systems like pure graphene bilayer with inversion symmetry at any sliding vector. Herein we show first-principles evidence that multilayer graphene with N>3 can all be ferroelectric, where the polarizations of polar states stem from the symmetry breaking in stacking configurations of across-layer instead of adjacent-layer, which are electrically switchable via interlayer sliding. The non-polar states can also be electrically driven to polar states via sliding, all nearly degenerate in energy, and more diverse states with distinct polarizations will emerge in more layers. In contrast to the ferroelectric Moire domains with opposite polarization directions in twisted bilayers reported previously, the Moire pattern in some multilayer graphene systems (e.g., twisted monolayer-trilayer graphene) possess nonzero net polarizations with domains of the same direction separated by non-polar regions, which can be electrically reversed upon interlayer sliding. The distinct Moire bands of two polar states should facilitate electrical detection of such sliding Moire ferroelectricity during switching

Fault-tolerant polyphase filters-based decimators for SRAM-based FPGA implementations

To reduce the oversampling rate of baseband signals, decimation is widely used in digital communication systems. Polyphase filters (PPFs) can be used to efficiently implement decimators. SRAM-based FPGAs provide large amounts of resources combined with flexibility and are a popular option for the implementation of communication receivers. However, they are sensitive to soft errors, which limit their application in harsh environments, such as space. An initial reliability study on SRAM-based FPGA implemented decimation shows that the soft errors on around 5% of the critical bits in the configuration memory of the decimator would degrade the decimated signal dramatically. Based on this result, this paper proposes an efficient fault tolerance scheme, in which the high correlation between adjacent PPFs outputs is utilized to tolerate the fault of a single-phase filter, and a duplicate and comparison structure is used to protect the fault tolerance logic. Hardware implementation and fault injection experiments show that the proposed scheme can drastically reduce the number of critical bits that cause severe output degradation with 1.5x resource usage and 0.75x maximum frequency relative to the unprotected decimator. Therefore, the proposed scheme can be an alternative to Triple Modular Redundancy that more than triples the use of resources.This work is supported by Natural Science Funds of China (Grant No. 62171313) and is partially supported by the ACHILLES project PID2019-104207RB-I00 funded by the Spanish Ministry of Science and Innovation and by the Madrid Community research project TAPIR-CM grant no. P2018/TCS-4496