5,456 research outputs found
Environmental and Natural Resources Management: Lessons from City Program Innovations
The enactment of the 1991 Local Government Code has brought greater responsibilities for local government units to manage their natural resources and the environment. This move has encouraged greater dynamism and innovation in some Philippine cities. Strategies employed and programs undertaken by various cities largely depend on the stage of development and their respective focus and priorities. For large urban cities, environmental problems are associated with growth and economic activity and thus, a special attention is given for a clean air and a healthy environment. This paper aims to draw lessons from selected cities that have undertaken innovative environmental programs and to highlight key elements that have made their programs successful and sustainable.metropolitan structure, environmental issues, metropolitan planning and development, environmental management
Managing the Environment and Natural Resources: Lessons from City Program Innovations
The enactment of 1991 Local Government Code has brought greater responsibilities for local government units to manage their natural resources and the environment. This move has encouraged greater dynamism and innovation in some Philippine cities. Strategies employed and programs undertaken by various cities largely depend on the stage of development and their respective focus and priorities. For large urban cities, environmental problems are associated with growth and economic activity and thus, a special attention is given for a clean air and a healthy environment. This paper aims to draw lessons from selected cities that have undertaken innovative environmental programs and to highlight key elements that have made their programs successful and sustainable.metropolitan structure, metropolitan planning and development, environmental management
Environmental and Natural Resources Management: Lessons from City Program Innovations
The enactment of the 1991 Local Government Code has brought greater responsibilities for local government units to manage their natural resources and the environment. This move has encouraged greater dynamism and innovation in some Philippine cities. Strategies employed and programs undertaken by various cities largely depend on the stage of development and their respective focus and priorities. For large urban cities, environmental problems are associated with growth and economic activity and thus, a special attention is given for a clean air and a healthy environment. This paper aims to draw lessons from selected cities that have undertaken innovative environmental programs and to highlight key elements that have made their programs successful and sustainable.metropolitan structure, environmental issues, metropolitan planning and development, environmental management
Improving the Spatial Dimension of the Annual Budget
With the delivery of most basic social services now devolved in the hands of local government units, has the process of budgeting followed suit? How far has the spatial dimension of the annual budget taken shape? Has regional budgeting--which was introduced as far back as the 1970s--become the norm and institutionalized as a process?fiscal management, fiscal sector
Asymptotic Correlations in Gapped and Critical Topological Phases of 1D Quantum Systems
Topological phases protected by symmetry can occur in gapped
and---surprisingly---in critical systems. We consider non-interacting fermions
in one dimension with spinless time-reversal symmetry. It is known that the
phases are classified by a topological invariant and a central charge
. We investigate the correlations of string operators, giving insight into
the interplay between topology and criticality. In the gapped phases, these
non-local string order parameters allow us to extract . Remarkably,
ratios of correlation lengths are universal. In the critical phases, the
scaling dimensions of these operators serve as an order parameter, encoding
and . We derive exact asymptotics of these correlation functions
using Toeplitz determinant theory. We include physical discussion, e.g.,
relating lattice operators to the conformal field theory. Moreover, we discuss
the dual spin chains. Using the aforementioned universality, the topological
invariant of the spin chain can be obtained from correlations of local
observables.Comment: 35 pages, 5 page appendi
Metropolitan Arrangements in the Philippines: A New Urban Development Challenge
The formation of metropolitan arrangements has recently become the trend. As these are still in the early stage of developing their identity, this note deals with the policy issues concerning metropolis and how to sustain such arrangements. It also presents the profile of the different emerging metropolis in the country.urban management, urbanization, metropolitan structure, metropolitan planning and development
F-theory at order
We study the effective physics of F-theory at order in derivative
expansion. We show that the ten-dimensional type IIB eight-derivative couplings
involving the graviton and the axio-dilaton naturally descend from pure gravity
in twelve dimensions. Upon compactification on elliptically fibered Calabi-Yau
fourfolds, the non-trivial vacuum profile for the axio-dilaton leads to a new,
genuinely N=1, correction to the four-dimensional effective action.Comment: 24 pages, minor improvements, typos correcte
Glassy Chimeras could be blind to quantum speedup: Designing better benchmarks for quantum annealing machines
Recently, a programmable quantum annealing machine has been built that
minimizes the cost function of hard optimization problems by adiabatically
quenching quantum fluctuations. Tests performed by different research teams
have shown that, indeed, the machine seems to exploit quantum effects. However
experiments on a class of random-bond instances have not yet demonstrated an
advantage over classical optimization algorithms on traditional computer
hardware. Here we present evidence as to why this might be the case. These
engineered quantum annealing machines effectively operate coupled to a
decohering thermal bath. Therefore, we study the finite-temperature critical
behavior of the standard benchmark problem used to assess the computational
capabilities of these complex machines. We simulate both random-bond Ising
models and spin glasses with bimodal and Gaussian disorder on the D-Wave
Chimera topology. Our results show that while the worst-case complexity of
finding a ground state of an Ising spin glass on the Chimera graph is not
polynomial, the finite-temperature phase space is likely rather simple: Spin
glasses on Chimera have only a zero-temperature transition. This means that
benchmarking optimization methods using spin glasses on the Chimera graph might
not be the best benchmark problems to test quantum speedup. We propose
alternative benchmarks by embedding potentially harder problems on the Chimera
topology. Finally, we also study the (reentrant) disorder-temperature phase
diagram of the random-bond Ising model on the Chimera graph and show that a
finite-temperature ferromagnetic phase is stable up to 19.85(15)%
antiferromagnetic bonds. Beyond this threshold the system only displays a
zero-temperature spin-glass phase. Our results therefore show that a careful
design of the hardware architecture and benchmark problems is key when building
quantum annealing machines.Comment: 8 pages, 5 figures, 1 tabl
Evidence of a glass transition in a 10-state non-mean-field Potts glass
Potts glasses are prototype models that have been used to understand the
structural glass transition. However, in finite space dimensions a glass
transition remains to be detected in the 10-state Potts glass. Using a
one-dimensional model with long-range power-law interactions we present
evidence that a glass transition below the upper critical dimension can exist
for short-range systems at low enough temperatures. Gaining insights into the
structural glass transition for short-range systems using spin models is thus
potentially possible, yet difficult.Comment: 4 pages, 1 table, 2 figure
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