다중혈관 관상동맥 환자에서 y-문합을 이용하여 양쪽 내흉동맥만을 사용한 우회술의 조기 성적

[신간의 별자리x] 우리/미술, 그리고 ‘슬픔의 박물관’

Photoinduced reactivity of titanium dioxide

Cause, conseguenze e strategie di mitigazione Proponiamo il primo di una serie di articoli in cui affronteremo l’attuale problema dei mutamenti climatici. Presentiamo il documento redatto, votato e pubblicato dall’Ipcc - Comitato intergovernativo sui cambiamenti climatici - che illustra la sintesi delle ricerche svolte su questo tema rilevante.

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Climate Change 2007: The Physical Science Basis.

Graphene’s success has shown that it is possible to create stable, single and few-atom-thick layers of van der Waals materials, and also that these materials can exhibit fascinating and technologically useful properties. Here we review the state-of-the-art of 2D materials beyond graphene. Initially, we will outline the different chemical classes of 2D materials and discuss the various strategies to prepare single-layer, few-layer, and multilayer assembly materials in solution, on substrates, and on the wafer scale. Additionally, we present an experimental guide for identifying and characterizing single-layer-thick materials, as well as outlining emerging techniques that yield both local and global information. We describe the differences that occur in the electronic structure between the bulk and the single layer and discuss various methods of tuning their electronic properties by manipulating the surface. Finally, we highlight the properties and advantages of single-, few-, and many-layer 2D materials in...

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Progress, Challenges, and Opportunities in Two-Dimensional Materials Beyond Graphene

For the current design of power transmission and transformation engineering design review system, there are some problems, such as poor functionality and processing capacity, and long system response time. The design review system of power transmission and Transformation Engineering Based on Spring + Struts + Hibernate (SSH) framework is designed. According to the definition and characteristics of SSH framework, this paper puts forward three classical frameworks: Struts, Spring and Hibernate, and integrates SSH framework. Through data cleaning, conversion and standardization, the evaluation data of transmission line engineering are simplified, and the evaluation data of transmission and transformation engineering are clustered by clustering algorithm. Analyze the overall requirements and functional requirements of the system, adopt SSH framework and design the overall system architecture in combination with specific business. Divide the system function structure from the user use type. Through the design of database structure and data table, the design of power transmission and transformation engineering design review system based on SSH framework is realized. The experimental results show that all functional modules of the system designed by the proposed method are in normal state, with an average throughput of 94.8mbps and a response time of only 17.2s. The proposed method has better functionality and processing capacity, and shorter system response time.

Design of power transmission and transformation engineering design review system based on spring struts hibernate framework

The present disclosure describes an image forming element having a semiconductor chip with micro-electro-mechanical-system (MEMS) devices and voltage generators, each voltage generator being configured to generate a voltage used by one or more of the MEMS devices. A floating ground may be used to add a voltage to the voltage generated by the voltage generators. The semiconductor chip may include electrical connections, where each voltage generator is configured to provide the voltage to the one or more MEMS devices through the electrical connections. The MEMS devices may define a boundary in the semiconductor chip within which the MEMS devices, the voltage generators, and the electrical connections are located. Each MEMS device may generate an electrostatic field to manipulate an electron beamlet of a multi-beam charged particle microscope. The MEMS devices may be organized into groups based on a distance to a reference location (e.g., optical axis) in the semiconductor chip.

Mems image forming element with built-in voltage generator

The invention relates to an efficient reuse and treatment device and method for a plant nutrient solution. The efficient reuse and treatment device comprises a circulating cultivation rack, a nutrientsolution storage tank, a nutrient mother solution replenishment unit, a quartz sand-activated carbon adsorption interception unit and a high-intensity ultraviolet mineralization unit; the nutrient mother solution replenishment unit is connected with the nutrient solution storage tank; an outlet of the nutrient solution storage tank is connected with an inlet of the circulating cultivation rack through a first solution conveying branch and a second solution conveying branch, and an outlet of the circulating cultivation rack is connected with an inlet of the nutrient solution storage tank for circulation of the plant nutrient solution; the first solution conveying branch is provided with the quartz sand-activated carbon adsorption interception unit and the high-intensity ultraviolet mineralization unit in sequence in the conveying direction of the nutrient solution. The efficient reuse and treatment device and method for the plant nutrient solution has the advantages that nutrient elements of the plant nutrient solution can be replenished; a plant nutrient solution regeneration system is used for degrading and removing suspended substances decomposed from crop residues, organic substances secreted from roots, harmful microorganisms and mutated viruses in the plant nutrient solution, thereby avoiding continuous cropping obstacles, and ensuring the efficient growth of plants.

Efficient reuse and treatment device and method for plant nutrient solution

Anomalies around T = 270 K observed in potassium blue bronze

Since the cold start of the internal combustion engine is not fuel efficient for vehicles, a warm start is desired. In this work, we propose to use thermal switching materials to warm-up the engine quickly at the cold start. We found that the V–VO2 core–shell structure can be a thermal switching material, which yields a higher electrical conductivity due to the electron transfer from V to VO2 above the insulator to metal transition temperature. The surface of V particles was converted into VO2 by controlled annealing in air, resulting in a V–VO2 core–shell structure. With such a V–VO2 core–shell structure, electrical conductivity increased from 2.1 × 105 to 5.1 × 105 S m−1 through the insulator-to-metal transition, resulting in an electronic thermal conductivity increase from 1.51 to 4.87 W m−1 K−1.

Qian Zhang

Papers

Design of power transmission and transformation engineering design review system based on spring struts hibernate framework

Mems image forming element with built-in voltage generator

Efficient reuse and treatment device and method for plant nutrient solution

Anomalies around T = 270 K observed in potassium blue bronze

V-VO 2 core-shell structure for potential thermal switching