6,820 research outputs found
Complex symmetric partial isometries
An operator T \in B(\h) is complex symmetric if there exists a
conjugate-linear, isometric involution C:\h\to\h so that . We
provide a concrete description of all complex symmetric partial isometries. In
particular, we prove that any partial isometry on a Hilbert space of dimension
is complex symmetric.Comment: 9 page
-algebras generated by truncated Toeplitz operators
We obtain an analogue of Coburn's description of the Toeplitz algebra in the
setting of truncated Toeplitz operators. As a byproduct, we provide several
examples of complex symmetric operators which are not unitarily equivalent to
truncated Toeplitz operators having continuous symbols.Comment: 12 page
Spatial isomorphisms of algebras of truncated Toeplitz operators
We examine when two maximal abelian algebras in the truncated Toeplitz
operators are spatially isomorphic. This builds upon recent work of N. Sedlock,
who obtained a complete description of the maximal algebras of truncated
Toeplitz operators.Comment: 24 page
Exciton Dissociation Dynamics in Model Donor-Acceptor Polymer Heterojunctions: I. Energetics and Spectra
In this paper we consider the essential electronic excited states in parallel
chains of semiconducting polymers that are currently being explored for
photovoltaic and light-emitting diode applications. In particular, we focus
upon various type II donor-acceptor heterojunctions and explore the relation
between the exciton binding energy to the band off-set in determining the
device characteristic of a particular type II heterojunction material. As a
general rule, when the exciton binding energy is greater than the band off-set
at the heterojunction, the exciton will remain the lowest energy excited state
and the junction will make an efficient light-emitting diode. On the other
hand, if the off-set is greater than the exciton binding energy, either the
electron or hole can be transferred from one chain to the other. Here we use a
two-band exciton to predict the vibronic absorption and emission spectra of
model polymer heterojunctions. Our results underscore the role of vibrational
relaxation and suggest that intersystem crossings may play some part in the
formation of charge-transfer states following photoexcitation in certain cases
Phonon-driven ultrafast exciton dissociation at donor-acceptor polymer heterojunctions
A quantum-dynamical analysis of phonon-driven exciton dissociation at polymer
heterojunctions is presented, using a hierarchical electron-phonon model
parameterized for three electronic states and 24 vibrational modes. Two
interfering decay pathways are identified: a direct charge separation, and an
indirect pathway via an intermediate bridge state. Both pathways depend
critically on the dynamical interplay of high-frequency C=C stretch modes and
low-frequency ring-torsional modes. The ultrafast, highly non-equilibrium
dynamics is consistent with time-resolved spectroscopic observations
Tanggung Jawab Konsultan Hukum sebagai Profesi Penunjang dalam Mewujudkan Prinsip Keterbukaan di Pasar Modal
Profesi penunjang merupakan pihak-pihak yang tugasnya melakukan pekerjaan membantu emiten mewujudkan penerapan prinsip-prinsip keterbukaan di pasar modal. Pasal 64 Undang-Undang Nomor 8 Tahun 1995 tentang Pasar Modal (UUPM) menentukan paling sedikit ada empat profesi penunjang di pasar modal yang membantu emiten dalam melakukan keterbukaan, yaitu profesi itu adalah akuntan, konsultan hukum, penilai dan notaris. Konsultan hukum adalah pihak independen yang dipercayai karena keahlian dan integritasnya untuk memberikan pendapat hukum (legal opinion) secara independen mengenai emisi dan emiten atau pihak lain yang terkait dengan kegiatan pasar modal. Untuk itu, konsultan hukum harus melakukan pemeriksaan dari segi hukum (legal audit). yang diperlukan penjamin pelaksana emisi terkait
Fire Impact on Wood: The Next Five Years
A forecast of effects of fire regulations on ten wood product categories in the next five years is presented. With more federal regulations anticipated, fire properties of products sold in the marketplace will be affected. Each product is discussed with emphasis on significant fire performance categories. If tests demonstrate potential hazards such as flame-spread, ease of ignition, or toxicity of combustion products for any wood products, appro-propriate improvements must be made
An LP-Based Approach for Goal Recognition as Planning
Goal recognition aims to recognize the set of candidate goals that are
compatible with the observed behavior of an agent. In this paper, we develop a
method based on the operator-counting framework that efficiently computes
solutions that satisfy the observations and uses the information generated to
solve goal recognition tasks. Our method reasons explicitly about both partial
and noisy observations: estimating uncertainty for the former, and satisfying
observations given the unreliability of the sensor for the latter. We evaluate
our approach empirically over a large data set, analyzing its components on how
each can impact the quality of the solutions. In general, our approach is
superior to previous methods in terms of agreement ratio, accuracy, and spread.
Finally, our approach paves the way for new research on combinatorial
optimization to solve goal recognition tasks.Comment: 8 pages, 4 tables, 3 figures. Published in AAAI 2021. Updated final
authorship and tex
On the stability analysis of periodic sine-Gordon traveling waves
We study the spectral stability properties of periodic traveling waves in the
sine-Gordon equation, including waves of both subluminal and superluminal
propagation velocities as well as waves of both librational and rotational
types. We prove that only subluminal rotational waves are spectrally stable and
establish exponential instability in the other three cases. Our proof corrects
a frequently cited one given by Scott.Comment: 22 pages, 6 figure
Analisa Dampak Pembangunan Rumah Sakit Siloam Manado Terhadap Kinerja Lalu Lintas Ruas Jalan Sam Ratulangi Dan Piere Tendean Manado
Dari semua sarana fasilitas umum yang ada, rumah sakit sebagai tempat rujukan perihal medis atau kesehatan, merupakan sesuatu hal yang tentunya sangat dibutuhkan. Rumah Sakit Siloam Manado dibangun untuk menjawab kebutuhan tersebut. Masalahnya terletak pada lokasi Rumah Sakit Siloam Manado, karena kondisi kemacetan lalu lintas di lokasi ini cukup parah sebelum dibangunnya Rumah Sakit Siloam. Dikhawatirkan keberadaan Rumah Sakit Siloam Manado akan memperparah kemacetan lalu lintas. Tujuan penelitian ini adalah untuk menentukan tarikan lalu lintas Rumah Sakit Siloam, dan pengaruhnya pada kinerja lalu lintas di ruas jalan Sam Ratulangi dan ruas jalan Piere Tendean. Data yang digunakan yaitu data tarikan pengunjung Rumah Sakit Siloam, dan volume lalu lintas yang ada di ruas jalan Sam Ratulangi dan Piere Tendean. Data dikumpulkan menggunakan metode survey. Kinerja jalan diukur dengan menggunakan standar MKJI 1997, dan kinerja kedua ruas jalan tersebut di tahun-tahun mendatang, dianalisis menggunakan analisa regresi
- …