Search Results - (Author, Cooperation:Pù)

1588-2632

Springer Online Journal Archives 1860-2000

Mathematics

Electronic Resource

2018-09-19

MDPI Publishing

1424-8220

Chemistry and Pharmacology

Electrical Engineering, Measurement and Control Technology

2023-02-23

News media, journalism, publishing ; Political science ; Politikwissenschaft ; Publizistische Medien, Journalismus,Verlagswesen ; hyperpartisanmedia; web-tracking data; computational social science; media attention ; Political Process, Elections, Political Sociology, Political Culture ; Mass Communication ; Massenkommunikation ; politische Willensbildung, politische Soziologie, politische Kultur ; populism ; news agency ; media policy ; media behavior ; information medium ; mass media ; Medienverhalten ; Medienpolitik ; Nachrichtenagentur ; Informationsmittel ; Massenmedien ; Populismus

Konferenzbeitrag, conference paper

2020-04-04

Having a perfect and romantic wedding were the dream of bridges and grooms. Nowadays, people have variety of forms; the choice of the new space is relatively broad. However, with the wedding companies comes out, many merchants offering different forms to cater for customers. Therefore, to let the wedding company can understand the needs of customers, we used the Kano Model to analyze the factors and what reasons can reduce the satisfaction of customers. The results indicate that “Main purpose of this project is to determine wedding market strategies in Taiwan. An analysis of the basic satisfaction dimensions of the Kano model was established based on the specific service attributes that most affect the total satisfaction of wedding company customers. It is planned to identify the voice of the wedding customer and then translate voice of the customer into critical to quality characteristics (CTQs).

Wirtschaft ; Economics ; Weddings; management; satisfaction; Kano model ; Marketing ; 20400 ; 40200

Zeitschriftenartikel, journal article

2024-03-07

This article examines how the Chinese elites are interpreting China's growing presence in the Latin American and Caribbean (LAC) region and the various ways in which the United States is responding to China's expanding activity in the region. Some of China's elites caution that China's international posturing could be overly assertive. Regarding China's growing role in the LAC, they have made a note of US sensitivities, in addition to China's challenges and limitations in various Latin American countries. Regarding the US response, some US concerns may be legitimate, and others are less valid. Looking ahead, even though US–China interactions in the LAC will remain competitive, the US and China could potentially avoid counterproductive policies while also pursuing pragmatic co-operation. While China does not yet face a serious problem of strategic overstretching in the LAC, China's domestic debate on the topic will provide feedback to China's policymakers and promote fruitful China-LAC relations.

Internationale Beziehungen ; International relations ; internationale Beziehungen, Entwicklungspolitik ; International Relations, International Politics, Foreign Affairs, Development Policy ; China ; Außenpolitik ; bilaterale Beziehungen ; internationale Beziehungen ; politischer Einfluss ; Lateinamerika ; internationale Zusammenarbeit ; internationale Politik ; Interessenpolitik ; Regionalpolitik ; USA ; foreign policy ; bilateral relations ; international relations ; political influence ; Latin America ; international cooperation ; international politics ; pressure-group politics ; regional policy ; United States of America

Zeitschriftenartikel, journal article

1089-7550

AIP Digital Archive

Physics

The coercive properties of magnetically uniaxial liquid-phase epitaxy garnet films were investigated between 10 K and the Néel temperature (TN≤500 K). Two independent methods, the results of which are nearly identical (magnetical response of oscillating domain walls and the method of coercive loops measured in a vibrating sample magnetometer), were used. Besides the usual domain-wall coercive field, Hdw, the critical coercive pressure, pdw, was also introduced as it describes in a direct way the interactions of the domain walls with the wall-pinning traps. Both Hdw and pdw were found to increase exponentially with decreasing temperature. Three different types of wall-pinning traps were identified in the sample and their strength, their rate of change with temperature, and their temperature range of activity were determined.

Electronic Resource

1089-7623

AIP Digital Archive

Physics

Electrical Engineering, Measurement and Control Technology

Experiments have been conducted on Constance B to study transport properties in electron cyclotron resonance (ECR) heated plasmas of high-charge-state neon ions. Measurements were made of confinement parallel and perpendicular to the magnetic field at heating frequencies of 10.5 and 14 GHz, and corresponding ECR magnetic field strengths. Although radial ion losses scaled approximately as B−2, the total particle confinement time was independent of magnetic field. Thus, higher current densities of multicharged neon ions were extracted at higher ECR heating frequency and magnetic field.

Electronic Resource

1089-7658

AIP Digital Archive

Mathematics

Physics

In this paper, a realization of the q-deformed boson operators on the Fock space from a generally algebraic point of view is given. The representations of the quantum group (Cn)q are thereby constructed in terms of this realization. Some infinite- and finite-dimensional representations of the q-analog of the Heisenberg–Weyl algebra are obtained on certain quotient spaces. Finally, the q-deformed differential realization of quantum group given by Alvarez-Gaume, Gomez, and Sierra (Preprint CERN-Th 5369/89) is derived from the boson realization.

Electronic Resource

1089-7623

AIP Digital Archive

Physics

Electrical Engineering, Measurement and Control Technology

An experimental investigation for extending the ion extraction capabilities of a two grid accelerator system to low energy is described. The preliminary results have shown that low-energy ion beams ranging from 15 to 80 eV can be extracted by biasing the screen grid potential to be negative to the ground at small grid separation distance. The beam currents which have been extracted are 20–60 mA. Beam current densities ranging from 0.15 to 0.45 mA/cm2 with good uniformities are measured at a location 20 cm downstream of the grids. It is found that the extraction capabilities are mainly determined by the operation parameters of the ion source, but they can be substantially effected by changing the grid separation distance and the magnetic field geometry and strength in the discharge chamber.

Electronic Resource

1089-7658

AIP Digital Archive

Mathematics

Physics

In this paper a new q-deformed boson realization of quantum algebra slq(n+1) is presented for the first time, and its representations are obtained in the nongeneric case that q is a root of unity. A new type of slq(2) R-matrices are systematically constructed through the universal R-matrix.

Electronic Resource

1089-7658

AIP Digital Archive

Mathematics

Physics

The inhomogeneous boson realizations (IHBR) and the corresponding inhomogeneous differential realizations (IHDR) of Lie algebras, which play an important role in the search of quasi-exactly solvable problems (QESP) of quantum mechanics, are studied. All possible IHDR of semisimple Lie algebras can be obtained in this way. As examples, the IHBR and the corresponding IHDR of Lie algebras SU(2) and SU(3) are studied in detail.

Electronic Resource

1089-7658

AIP Digital Archive

Mathematics

Physics

The solution of the Yang–Baxter equation for integrable systems is shown to be equivalent to the existence of a differential identity. Quantum integration formulas for the calculation of commutators of monodromy matrices are given. Based on the integration formulas and the systematic use of differential identities, the Yang–Baxter equations for the nonlinear Schrödinger model for the quantum case of both bosons and fermions are derived. The case for discrete models is also included. The parallelism between the classical and quantum case and the classical limiting process from the latter to the former are discussed.

Electronic Resource

1089-7658

AIP Digital Archive

Mathematics

Physics

By making use of the differential realization of Lie algebras in the space of inhomogeneous polynomials of a certain number of variables, the corresponding inhomogeneous boson realization of Lie algebras is given. A new kind of indecomposable representations of Lie algebras are studied on the universal enveloping algebra of Heisenberg–Weyl algebra, its subspaces and its quotient spaces. The finite-dimensional representations are naturally obtained on the subspaces of Fock space. As an example, the indecomposable and irreducible representations of the Lie algebra su(2) are discussed in detail.

Electronic Resource

1089-7658

AIP Digital Archive

Mathematics

Physics

A formula for scalar products of Bethe wave functions in the nonlinear Schrödinger model of spin- (1)/(2) particles is proposed. It is shown, in addition, that one can replace conjugate states by dual eigenfunctions to calculate correlation functions for integrable systems.

Electronic Resource

1089-7674

AIP Digital Archive

Physics

Using the reductive perturbation method, the carrier wave modulation of ion acoustics waves in inhomogeneous plasma is investigated. It is shown that such a process can be described by a Nonlinear Schrödinger-type equation (NLS-type) equation. © 1998 American Institute of Physics.

Electronic Resource

1089-7550

AIP Digital Archive

Physics

A theoretical model accounting for the macropolarization effects in wurtzite III–V nitrides quantum wells (QWs) is presented. Energy dispersions and exciton binding energies are calculated within the framework of effective-mass theory and variational approach, respectively. Exciton-associated transitions (EATs) are studied in detail. An energy redshift as high as 450 meV is obtained in Al0.25GaN0.75/GaN QWs. Also, the abrupt reduction of optical momentum matrix elements is derived as a consequence of quantum-confined Stark effects. EAT energies are compared with recent photoluminescence (PL) experiments and numerical coherence is achieved. We propose that it is the EAT energy, instead of the conduction–valence-interband transition energy that is comparable with the PL energy. To restore the reduced transition rate, we apply an external electric field. Theoretical calculations show that with the presence of the external electric field the optical matrix elements for EAT increase 20 times. © 2001 American Institute of Physics.

Electronic Resource

1539-6924

Blackwell Publishing Journal Backfiles 1879-2005

Energy, Environment Protection, Nuclear Power Engineering

When stricken by a terrorist attack, a war, or a natural disaster, an economic unit or a critical infrastructure may suffer significant loss of productivity. More importantly, due to interdependency or interconnectedness, this initial loss may propagate into other systems and eventually lead to much greater derivative loss. This belongs to what is known as a cascading effect. It is demonstrated in this article that the cascading effect and the derivative loss can be significantly reduced by effective risk management. This is accomplished by deliberately distributing the initial inoperability to other systems so that the total loss (or inoperability) is minimized. The optimal distribution strategy is found by a linear programming technique. The same risk management can also be applied to situations where objectives need to be prioritized. A case study featuring 12 economic sectors illustrates the theory. The result suggests that using the same amount of resources, minimizing risk (inoperability) of infrastructures will generally give rise to highest payoff, whereas overlooking it may result in greatest total loss. The framework developed in this work uses a steady-state approach that applies primarily to managing situations where the attack is catastrophic resulting in very long recovery time.

Electronic Resource

1471-4159

Blackwell Publishing Journal Backfiles 1879-2005

Medicine

Impaired function of the brain vasculature might contribute to the development of HIV-associated dementia. For example, injury or dysfunction of brain microvascular endothelial cells (BMEC) can lead to the breakdown of the blood–brain barrier (BBB) and thus allow accelerated entry of the HIV-1 virus into the CNS. Mechanisms of injury to BMEC during HIV-1 infection are not fully understood, but the viral gene product Tat may be, at least in part, responsible for this effect. Tat can be released from infected perivascular macrophages in the CNS of patients with AIDS, and thus BMEC can be directly exposed to high concentrations of this protein. To study oxidative and inflammatory mechanisms associated with Tat-induced toxicity, BMEC were exposed to increasing doses of Tat1−72, and markers of oxidative stress, as well as redox-responsive transcription factors such as nuclear factor-κB (NF-κB) and activator protein-1 (AP-1), were measured. Tat1−72 treatment markedly increased cellular oxidative stress, decreased levels of intracellular glutathione and activated DNA binding activity and transactivation of NF-κB and AP-1. To determine if Tat1−72 can stimulate inflammatory responses in brain endothelium in vivo, expression of monocyte chemoattractant protein-1 (MCP-1), an NF-κB and AP-1-dependent chemokine, was studied in brain tissue in mice injected with Tat1−72 into the right hippocampus. Tat1−72 markedly elevated the MCP-1 mRNA levels in brain tissue. In addition, a double immunohistochemistry study revealed that MCP-1 protein was markedly overexpressed on brain vascular endothelium. These data indicate that Tat1−72 can induce redox-related inflammatory responses both in in vitro and in vivo environments. These changes can directly lead to disruption of the BBB. Thus, Tat can play an important role in the development of detrimental vascular changes in the brains of HIV-infected patients.

Electronic Resource

1471-4159

Blackwell Publishing Journal Backfiles 1879-2005

Medicine

Abstract: Two fatty acid binding proteins (FABPs) were isolated from Swiss Webster mouse brains. Neither protein cross-reacted with antisera to recombinant liver L-FABP. One protein, designated brain H-FABP, migrated on tricine sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) as a single band at 14.5 kDa with pl 4.9. Brain H-FABP bound NBD-stearic acid and cis-parinaric acid with KD values near 0.02 and 0.5 µM, respectively. Brain H-FABP cross-reacted with affinity-purified antisera to recombinant heart H-FABP. The second protein, mouse brain B-FABP, migrated on tricine SDS-PAGE gels as a doublet at 16.0 and 15.5 kDa with pl values of 4.5 and 4.7, respectively. Brain B-FABP bound NBD-stearic acid and cis-parinaric acid with KD values near 0.01 and 0.7 µM, respectively. The brain B-FABP doublet was immunoreactive with affinity-purified antibodies against recombinant mouse brain B-FABP, but not with affinity-purified antibodies against heart H-FABP. [3H]Oleate competition binding indicated that the two brain FABPs had distinct ligand binding specificities. Both bound fatty acids, fatty acyl CoA, and lysophosphatidic acid. Although both preferentially bound unsaturated fatty acids, twofold differences in specific saturated fatty acid binding were observed. Brain B-FABP and brain H-FABP represented 0.1 and 0.01% of brain total cytosolic protein, respectively. In summary, mouse brain contains two native fatty acid binding proteins, brain H-FABP and brain B-FABP.

Electronic Resource

1471-4159

Blackwell Publishing Journal Backfiles 1879-2005

Medicine

Abstract: Although lipids are essential to brain function, almost nothing is known of lipid transfer proteins in the brain. Early reports indicates cross-reactivity of brain proteins with antisera against two native liver sterol transfer proteins, sterol carrier protein-2 (SCP-2) and the liver form of fatty acid-binding protein (L-FABP). Herein, polyclonal antibodies raised against the recombinant liver sterol transfer proteins SCP-2 and L-FABP were used to identify the lipid transfer proteins in the brains of alcohol-treated and control mice. L-FABP was not detectable in brain of either control or chronic ethanol-treated mice. In contrast, SCP-2 not only was present, but its level was significantly (p 〈 0.05) increased 23 and 50%, respectively, in brain homogenates and synaptosomes of mice exposed to alcohol. To determine whether antibodies against the recombinant liver SCP-2 reflected true levels of SCP-2 in brain, the cDNA sequence for brain SCP-2 was isolated from a brain cDNA library. The mouse brain SCP-2 sequence was 99.99% identical to the mouse liver SCP-2 sequence. The translated sequence differed by only one amino acid, and the replacement was conservative. Thus, unlike the fatty acid binding proteins, the SCP-2 moieties of brain and liver are essentially identical. Polyclonal antibodies against acyl-CoA binding protein, a lipid-binding protein that does not bind or transfer sterol, showed that increased levels of brain SCP-2 with chronic ethanol consumption did not represent a general increase in content of all lipid transfer proteins. Changes in the amount of SCP-2 may contribute to membrane tolerance to ethanol.

Electronic Resource