2,589 research outputs found
Capture of CO2 from Coal-fired Power Plant with NaOH Solution in a Continuous Pilot-scale Bubble-column Scrubber
AbstractA continuous pilot-scale bubble-column scrubber with NaOH as the absorbent was used to explore the capture of CO2 gas from a coal-fired power plant. The experimental design was based on the results of previous study. The diameter of the column was 20cm and the height of the column was 2.4 m. According to the S/N ratio, parameters, including absorption rate (RA), absorption efficiency (E), overall mass-transfer coefficient (KGa) and ratio of the gas-liquid flow rate (R), were selected for Taguchi analysis to obtain optimum conditions. A total of eleven experiments were carried out to verify the optimum conditions here. The range of the gas-flow rate (Qg) and liquid-flow rate (QLT) conducted in this work were 48-192 L/min and 1.6-10 L/min, respectively. The input gas concentrations were 9-12.2%. Using a steady-state material balance with a two-film model, RA and KGa could be determined. The results showed that E, RA and KGa were in the range of 30-98%, 1.03x10-4-11.48x10-4mol/s-L and 0.018-0.058 1/s, respectively. The obtained scrubbing factors (φ) were 0.00285-0.146mol/mol-L, while R was in the range of 0.23-24.14. The dynamic behavior of the scrubber was also discussed in this study. The results could be used as a basis for commercial scale operation for the carbon capture at a power plant as well as microalgae cultivation
Interaction-induced first order correlation between spatially-separated 1D dipolar fermions
We calculate the ground-state properties of fermionic dipolar atoms or
molecules in a one-dimensional double-tube potential by using the Luttinger
liquid theory and the density matrix renormalization-group calculation. When
the external field is applied near a magic angle with respect to the
double-tube plane, the long-ranged dipolar interaction can generate a
spontaneous correlation between fermions in different tubes, even when the bare
intertube tunneling rate is negligibly small. Such interaction-induced
correlation strongly enhances the contrast of the interference fringes and
therefore can be easily observed in the standard time-of-flight experiment.Comment: Same as the published versio
Dual residence time for droplet to coalesce with liquid surface
When droplets approach a liquid surface, they have a tendency to merge in
order to minimize surface energy. However, under certain conditions, they can
exhibit a phenomenon called coalescence delay, where they remain separate for
tens of milliseconds. This duration is known as the residence time or the
non-coalescence time. Surprisingly, under identical parameters and initial
conditions, the residence time for water droplets is not a constant value but
exhibits dual peaks in its distribution. In this paper, we present the
observation of the dual residence times through rigorous statistical analysis
and investigate the quantitative variations in residence time by manipulating
parameters such as droplet height, radius, and viscosity. Theoretical models
and physical arguments are provided to explain their effects, particularly why
a large viscosity or/and a small radius is detrimental to the appearance of the
longer residence time peak.Comment: 7 pages, 6 figure
Right ventricular exclusion for hepatocellular carcinoma metastatic to the heart
We used for the first time a right ventricular exclusion procedure for the treatment of hepatocellular carcinoma metastatic to the right ventricle. Our case report shows that this surgical option can be effective as rescue therapy for right ventricular outflow tract obstruction secondary to myocardial metastasis in critically ill patients. Most notably, this technique can prevent inadvertent dislodgement of tumor cells
An e-Business Logistic Model in Taiwan
The current article develops a framework for an e-business logistic model in Taiwan. The model includes e-marketplace, logistic, organization, and informational systems factors. Data used for this research come from a survey of business groups, including marine and air carriers, terminal warehousing, custom brokers, shipping centers, and marine information service providers. Our study reveals relationships between essential variables for e-business trading in the logistic industry. These include organizational advantage and information technology, strategy and vision, consumer-directed service and planning, lower cost and high quality customer service, quick merchandise delivery and low inventory, and long-term development plans. Specifically, we found that the logistic industry in Taiwan ignores the details of purchasing procedure in e-marketplace operation, focusing more on actual merchandise delivery, consumer satisfaction, and downstream consumer service. In addition, the logistical industry in Taiwan also involves employee adjustment to the new environment, support from upper management, training and, application of information technology
Bulk locality from the celestial amplitude
In this paper, we study the implications of bulk locality on the celestial
amplitude. In the context of the four-point amplitude, the fact that the bulk
S-matrix factorizes locally in poles of Mandelstam variables is reflected in
the imaginary part of the celestial amplitude. In particular, on the real axis
in the complex plane of the boost weight, the imaginary part of the celestial
amplitude can be given as a positive expansion on the Poincar\'e partial waves,
which are nothing but the projection of flat-space spinning polynomials onto
the celestial sphere. Furthermore, we derive the celestial dispersion relation,
which relates the imaginary part to the residue of the celestial amplitude for
negative even integer boost weight. The latter is precisely the projection of
low energy EFT coefficients onto the celestial sphere. We demonstrate these
properties explicitly on the open and closed string celestial amplitudes.
Finally, we give an explicit expansion of the Poincar\'e partial waves in terms
of 2D conformal partial waves.Comment: 43 pages, 10 figures. v2: typos corrected, minor clarifications
added, SciPost published versio
Online Mixed Discrete and Continuous Optimization: Algorithms, Regret Analysis and Applications
We study an online mixed discrete and continuous optimization problem where a
decision maker interacts with an unknown environment for a number of
rounds. At each round, the decision maker needs to first jointly choose a
discrete and a continuous actions and then receives a reward associated with
the chosen actions. The goal for the decision maker is to maximize the
accumulative reward after rounds. We propose algorithms to solve the online
mixed discrete and continuous optimization problem and prove that the
algorithms yield sublinear regret in . We show that a wide range of
applications in practice fit into the framework of the online mixed discrete
and continuous optimization problem, and apply the proposed algorithms to solve
these applications with regret guarantees. We validate our theoretical results
with numerical experiments
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