23,830 research outputs found
Science mapping approach to assisting the review of construction and demolition waste management research published between 2009 and 2018
Sustainable treatments of construction and demolition (C&D) wastes have become an increasingly urgent social, environmental, and economic issue worldwide. Based on a filter of 370 articles related to C&D waste management, this review-based study adopted a science mapping approach to evaluating the recent decade’s C&D waste management research. Through a three-step workflow consisting of bibliometric literature search, scientometric analysis, and qualitative discussion, this study identified the most influential journals, scholars, articles, and countries that have been active and influential in the C&D waste management research since 2009. Keyword analysis revealed the emerging research topics, such as BIM, prefabricated construction, Big Data, and Circular Economy. The follow-up discussion summarized the mainstream research areas (e.g., qualification of waste generation), discussed research gaps (e.g., integration of BIM and Big Data into C&D waste management), and proposed the framework for near-future research, such as a comprehensive evaluation of the performance of C&D waste diversion, human factors, and design and planning for waste diversion. By providing the big picture of the latest research in C&D waste management since 2009, the paper serves as a multi-disciplinary guide for practitioners and researchers to link current research areas into future trends
Quantum Communication Through a Spin-Ring with Twisted Boundary Conditions
We investigate quantum communication between the sites of a spin-ring with
twisted boundary conditions. Such boundary conditions can be achieved by a flux
through the ring. We find that a non-zero twist can improve communication
through finite odd numbered rings and enable high fidelity multi-party quantum
communication through spin rings (working near perfectly for rings of 5 and 7
spins). We show that in certain cases, the twist results in the complete
blockage of quantum information flow to a certain site of the ring. This effect
can be exploited to interface and entangle a flux qubit and a spin qubit
without embedding the latter in a magnetic field.Comment: four pages two figure
Effects of individual sound sources on the subjective loudness and acoustic comfort in underground shopping streets
Previous studies have demonstrated that human evaluation of subjective loudness and
acoustic comfort depends on a series of factors in a particular situation rather than only on
sound pressure levels. In the present study, a large-scale subjective survey has been
undertaken on underground shopping streets in Harbin, China, to determine how individual
sound sources influence subjective loudness and acoustic comfort evaluation. Based on the
analysis of case study results, it has been shown that all individual sound sources can increase
subjective loudness to a certain degree. However, their levels of influence on acoustic comfort
are different. Background music and the public address system can increase acoustic comfort,
with a mean difference of 0.18 to 0.32 and 0.21 to 0.27, respectively, where a five-point
bipolar category scale is used. Music from shops and vendor shouts can decrease acoustic
comfort, with a mean difference of -0.11 to -0.38 and -0.39 to -0.62, respectively. The
feasibility of improving acoustic comfort by changing certain sound sources is thus
demonstrated
Field study on the influence of spatial and environmental characteristics on the evaluation of subjective loudness and acoustic comfort in underground shopping streets
A large-scale measurement and subjective survey was undertaken in five underground
shopping streets to determine the influence of spatial and environmental characteristics on
users’ subjective loudness and acoustic comfort. The analysis on the spatial characteristics
shows that the subjective loudness is higher in “street type” than in “square type”
underground shopping streets when the equivalent continuous A-weighted sound pressure
level (LAeq) is relatively high (75 dBA). Acoustic comfort is higher in “square type” than in
“street type” underground shopping streets where LAeq is relatively low (55 dBA).
Considering spatial functions, it is found that acoustic comfort is higher in a dining area than
in a shopping area. In terms of environmental characteristics where air temperature, relative
humidity, luminance and visual aspect were considered, the subjective loudness is influenced
by humidity and luminance, with correlation coefficients of 0.10 to 0.30. The evaluation of
acoustic comfort is influenced by air temperature, humidity, and luminance, with correlation
coefficients of 0.1 to 0.4. There are significant correlations between the evaluation of
environmental factors and subjective loudness, as well as, acoustic comfort. The correlation
coefficients are 0.1 to 0.5. Moreover, respondents’ attitude to sound environment could
influence their evaluation of subjective loudness and acoustic comfort
Hawking radiation from the Schwarzschild black hole with a global monopole via gravitational anomaly
Hawking flux from the Schwarzschild black hole with a global monopole is
obtained by using Robinson and Wilczek's method. Adopting a dimension reduction
technique, the effective quantum field in the (3+1)--dimensional global
monopole background can be described by an infinite collection of the
(1+1)--dimensional massless fields if neglecting the ingoing modes near the
horizon, where the gravitational anomaly can be cancelled by the
(1+1)--dimensional black body radiation at the Hawking temperature.Comment: 4 pages, no figure, 3nd revsion with one reference adde
Geometric entanglement from matrix product state representations
An efficient scheme to compute the geometric entanglement per lattice site
for quantum many-body systems on a periodic finite-size chain is proposed in
the context of a tensor network algorithm based on the matrix product state
representations. It is systematically tested for three prototypical critical
quantum spin chains, which belong to the same Ising universality class. The
simulation results lend strong support to the previous claim [Q.-Q. Shi, R.
Or\'{u}s, J. O. Fj{\ae}restad, and H.-Q. Zhou, New J. Phys \textbf{12}, 025008
(2010); J.-M. St\'{e}phan, G. Misguich, and F. Alet, Phys. Rev. B \textbf{82},
180406R (2010)] that the leading finite-size correction to the geometric
entanglement per lattice site is universal, with its remarkable connection to
the celebrated Affleck-Ludwig boundary entropy corresponding to a conformally
invariant boundary condition.Comment: 4+ pages, 3 figure
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