快速计算电网可用输电能力的交流灵敏度方法

在电力市场环境下，可用输电能力(ATC)是反映输电设备可用于能量交易的剩余容量的重要指标。ATC一旦确定后，快速估计出系统参数变化对输电能力的影响具有很大的实际应用价值。文中首先基于连续潮流方法，考虑输电支路的过负荷约束、发电机有功及无功出力约束和节点电压约束，计算出ATC的值；然后推导出ATC对多种运行参数摄动的一阶灵敏度计算模型，运行参数包括节点负荷功率、发电节点端电压以及给定的能量交易，这些灵敏度系数能够很快地计算；最后，使用了IEEE30节点系统的算例来验证文中所提出的方法的有效性和快速性。     

Large edge magnetism in oxidized few-layer black phosphorus nanomeshes

The formation and control of a room-temperature magnetic order in twodimensional (2D) materials is a challenging quest for the advent of innovative magnetic-and spintronic-based technologies.To date,edge magnetism in 2D materials has been experimentally observed in hydrogen (H)-terminated graphene nanoribbons (GNRs) and graphene nanomeshes (GNMs),but the measured magnetization remains far too small to allow envisioning practical applications.Herein,we report experimental evidences of large room-temperature edge ferromagnetism (FM) obtained from oxygen (O)-terminated zigzag pore edges of few-layer black phosphorus (P) nanomeshes (BPNMs).The magnetization values per unit area are ～100 times larger than those reported for H-terminated GNMs,while the magnetism is absent for H-terminated BPNMs.The magnetization measurements and the first-principles simulations suggest that the origin of such a magnetic order could stem from ferromagnetic spin coupling between edge P with O atoms,resulting in a strong spin localization at the edge valence band,and from uniform oxidation of full pore edges over a large area and interlayer spin interaction.Our findings pave the way for realizing high-efficiency 2D flexible magnetic and spintronic devices without the use of rare magnetic elements.     

Medical image diagnosis of lung cancer by a revised GMDH-type neural network using various kinds of neuron

A revised group method of data handling (GMDH)-type neural network algorithm using various kinds of neuron is applied to the medical image diagnosis of lung cancer. The optimum neural network architecture for medical image diagnosis is automatically organized using a revised GMDH-type neural network algorithm, and the regions of lung cancer are recognized and extracted accurately. In this revised GMDH-type neural network algorithm, polynomial-type and radial basis function (RBF)-type neurons are used for organizing the neural network architecture in order to fit the complexity of the nonlinear system.     

High Speed HPD for Photon Counting

We have succeeded in the development of a high-speed Hybrid Photodetector (HPD), by using a reduced electron lens and a newly developed avalanche diode (AD) with very low capacitance. The HPD shows fast time response of less than 500 ps in both rise and fall times, and good timing resolution of 26 ps (one sigma) for single photons at full illumination on a photocathode 8 mm in diameter. Limiting factors of the timing resolution were further investigated, and were found to be the transit time difference of electrons in vacuum along the photocathode and the jitter of the electronics. The timing resolution is 15 ps for illumination of less than 5 mm on the central part of the photocathode, which includes the jitter of 13 ps from the electronics. This resolution is the world's highest for HPDs, and matches the resolution of MCP-PMTs. Both a GaAsP photocathode having close to 50% quantum efficiency in the visible and a bialkali photocathode having 34% QE in the UV were fabricated in view of making this device available for various applications. In this paper, we report the results of our evaluation, including discussion about the limiting factors of the timing resolution for the new HPD.     

Application of Super High Definition Images in Telemedicine: System Requirements and Technologies for Teleradiology and Telepathology

It was recognized early on that the digitization of medical information would advance the efficiency of diagnostic technology. However, the digitization of image data, which makes up the majority of medical information, is dependent on advances in technologies such as input, processing, transmission, storage, and display. Insufficient advances in such technologies has effectively limited the digitization of image data for medical use. The result of this has been non-networked systems or LANs confined to a single hospital. Such isolated systems integrate only portions of digital medical images such as x-ray computer tomography (CT), magnetic resonance (MR), and computed radiography (CR).Fortunately, recent advances in the areas of super high definition image I/O, high-quality encoding, super high speed transmission, and high-capacity storage has turned the tide in favor of the digitization and networking of all medical information. This paper will focus on the digitization and networking of medical image information used within hospitals and provide a multifaceted study of the technologies necessary for these advances. This will allow us to discuss the present state of related technical developments and the level that has been attained so far. In addition, we have targeted image information that demands the highest level of quality (radiological and pathological images) for application in medical diagnosis using super high definition images, the image technology being developed by the authors of this paper. We will cover the concrete issues and approaches to solutions that must be investigated when building and networking a digital system.     

Protective effect of a vitamin E analog, phosphatidylchromanol, against oxidative hemolysis of human erythrocytes

The protective effect of a vitamin E analog, phosphatidylchromanol [1,2-diacyl-sn-glycero-3-phospho-2′-(hydroxyethyl)-2′, 5′,7′,8′-tetramethyl-6′-hydroxychroman; PCh], against oxidative hemolysis of human erythrocytes was examined and was compared with those of vitamin E (α-tocopherol) and 2,2,5,7,8-pentamethyl-6-chromanol (PMC). These three compounds at 50 μM protected the erythrocytes from hemolysis, when erythrocyte suspension (10%, vol/vol) was incubated with a water-soluble radical generator, 2,2′-azobis(2-amidino-propane)-dihydrochloride (75 mM). When erythrocyte suspension was oxidized after pretreatment with these compounds (50 μM) for 30 min followed by washing, PCh protected about 54% of erythrocytes from the hemolysis, while α-tocopherol protected only about 16% of the cells and PMC did not show any protective effect. During preincubation, α-tocopherol, PMC, and PCh were incorporated into the cells at the concentration of 12.6, 3.7, and 16.3 nmol/mg protein, respectively. Moreover, PCh was found in the ghost membrane fraction at a 20% higher level than α-tocopherol, and no PMC was detected in this fraction. These results indicate that phosphatidyl group in PCh accts as an excellent carrier of chromanol moiety into cells as well as an anchor within membranes more efficiently than phytyl group in α-tocopherol. PMC seems to be slightly anchored within membranes because of the lack of hydrophobic side chain. The excellent antihemolytic activity of PCh is likely to be caused by its accumulation within erythrocyte membranes.     

几株采油菌驱油性能的物模试验

对B1-4、Ⅳ、TB褐、长Ⅱ、DY一1、LJ1、Z-2六株菌开展了单一菌种和复配菌种岩心驱替模拟实验.首先,开展了单菌种在不同驱油阶段的岩心驱油模拟实验.在整个驱替阶段无论发酵原液或稀释液均可以提高原油采收率,因此,从经济方面考虑微生物驱宜采用培养基稀释的茵液.其次,通过复配菌种模拟实验,确定了微生物和弱凝胶联合作用时,不同段塞微生物的选择和配比.通过开展岩心模拟实验,为今后开展微生物驱油和弱微联作提供可借鉴的有利信息,为华北油田微生物采油的发展提供有力的支持.     

长链支化高熔体强度聚丙烯研究综述

文章对长链支化高熔体强度聚丙烯的研究及应用作了比较详尽的叙述,并对其性能方法进行了综述。     

Surface graphitization of Furan-resin-derived carbon

Furan-resin-derived carbon generally produces a glass-like carbon having entangled graphene layers (graphite structure) after high temperature heat-treatments. However, Raman spectroscopy reveals that it produces well-graphitized thin skins on surfaces. The graphitization is promoted on the faces that are formed at lower heat-treatment temperatures. Fractured faces of specimens pre-heat-treated at 1000°C result in well-developed structures in graphitization after re-heat-treatment at 3000°C. It is considered that the surfaces, i.e. free faces, play an important role in the graphitization.