Synergistic Effect on CO2 Capture by Binary Solvent System

CO2 absorption into a binary solvent system was studied using a batch‐mode gas/liquid absorption apparatus. The binary system composed of potassium carbonate (K2CO3) and piperazine (PZ) showed a strong synergistic effect, whereby the binary solvent performed better than either of the individual solvents for CO2 absorption. The other pairs of solvents tested (K2CO3/monoethanolamine (MEA) and K2CO3/NaOH) showed no synergistic effects. The results indicate that this synergistic effect only occurs with specific pairs of solvents. The mechanism for the synergistic effect is postulated that the activated CO2 on PZ migrates to K2CO3, or a more reactive intermediate complex between K2CO3 and PZ is formed

Continuous-variable controlled-Z gate using an atomic ensemble

The continuous-variable controlled-Z gate is a canonical two-mode gate for universal continuous-variable quantum computation. It is considered as one of the most fundamental continuous-variable quantum gates. Here we present a scheme for realizing continuous-variable controlled-Z gate between two optical beams using an atomic ensemble. The gate is performed by simply sending the two beams propagating in two orthogonal directions twice through a spin-squeezed atomic medium. Its fidelity can run up to one if the input atomic state is infinitely squeezed. Considering the noise effects due to atomic decoherence and light losses, we show that the observed fidelities of the scheme are still quite high within presently available techniques.Comment: 7 pages, 3 figures, to appear in Physical Review

Diagnostic accuracy of cardiovascular magnetic resonance for patients with suspected cardiac amyloidosis: a systematic review and meta-analysis

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Current Situation of Organ Donation in China

The shortage of organs is a worldwide challenge for transplantation. To alleviate such organ shortage and keep pace with the world’s development and experience on organ transplantation, the pilot program of organ donation after citizen death (DCD) has been carried out in China, with support and attention from the Chinese government. From 2010, with the joint efforts of the government and medical workers for these years, a series of laws, regulations and related process management have been formulated, and great achievements have been made in DCD work. Currently, the main source of organs in China has come from DCD. However, some difficulties still restrict organ donation rates. Firstly, resistance to organ donation in China is often due to the conventional view among citizens. Secondly, some medical workers do not fully understand the definition and diagnosis criteria of brain death and therefore do not uphold and promote DCD work. Thirdly, the existing laws and institutions for organ transplantation fail to implement and remain defective. Nevertheless, China has made a firm and strong stride in DCD work. In order to carry out DCD work better, Chinese government, people and medical workers have to do much more

The Impact of Coal and Biomass Co-Firing on the Economy of Power Plant Carbon Capture

A detailed economic evaluation was carried out to determine the impact of biomass and coal co-firing on power plant carbon capture by methods of plants equipment designing factors and performance, and the sum up of the associated breakdowns of CAPEX and OPEX. Based on the assumptions of the CO2 neutrality of biomass and likely governmental incentives to reduce CO2 emissions, the study results show that biomass and coal co-firing would result in both lower cost of carbon avoided (carbon capture) and lower incremental cost of electricity generation when MEA solvent carbon capture is applied. Two scenarios for co-firing with carbon capture, 30% biomass blending and 90% or 60% CO2 capture from stack, indicate different preference depending on lower or higher incentives

Emerging New Types of Absorbents for Postcombustion Carbon Capture

Carbon capture is the most probable technology in combating anthropogenic increase of CO2 in the atmosphere. Works on developing emerging absorbents for improving carbon capture performance and reducing process energy consumption are actively going on. The most worked‐on emerging absorbents, including liquid‐liquid biphasic, liquid‐solid biphasic, enzymatic, and encapsulated absorbents, already show encouraging results in improved energy efficiency, enhanced CO2 absorption kinetics, increased cyclic CO2 loading, or reduced regeneration temperature. In this chapter, the latest research and development progress of these emerging absorbents are reviewed along with the future directions in moving these technologies to higher‐technology readiness levels

Research on the Application of Computational Materials Science in Undergraduate Teaching

In this paper, by taking first-principles software as examples, we apply computational materials science to the teaching process of undergraduates majoring in physics, chemistry and materials. We pay attention to the connection between theoretical research and experimental models, makes the abstract principle intuitive and dynamic, and facilitates students’ understanding of knowledge, a deep understanding of the structure of materials and the relationship between theoretical properties and macro properties, which can greatly enhance students’ initiative and creativity in participating in teaching activities. To a great extent, this has played a role of computational simulation as a bridge between theoretical teaching and experimental teaching to continue to explore the complementary relationship between computational simulation, theoretical teaching and experimental teaching, build a teaching model for the application and design ability training of materials and chemistry talents

N-{2-[4-(2-Meth­oxy­phen­yl)piperazin-1-yl]eth­yl}pyridin-2-amine monohydrate

In the title compound, C18H24N4O·H2O, the piperizine ring adopts a chair conformation and the dihedral angle between the phenyl and pyridine rings is 39.9 (3)°. The comformations of the attachment of the anisole and N-ethyl­pyridin-2-amine groups to the piperazine ring are +anti­periplanar. An intra­molecular C—H⋯O inter­action occurs. In the crystal, the water mol­ecule links the mol­ecules into chains through O—H⋯N hydrogen bonds. Weak N—H⋯O, C—H⋯N and C—H⋯O inter­actions further stabilize the crystal structure