- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
A General Relation Between Frequency Noise and Lineshape of Laser Light
摘要： Bloom-?lter-based forwarding has been suggested to solve several fundamental problems in the current Internet, such as routing-table growth, multicast scalability issues, and denial-of-service (DoS) attacks by botnets. The proposed protocols are source-routed and include the delivery tree encoded as a Bloom ?lter in each packet. The network nodes forward packets based on this in-packet information without consulting routing tables and without storing per-?ow state. We show that these protocols have critical vulnerabilities and make several false security assumptions. In particular, we present DoS attacks against broad classes of Bloom-?lter-based protocols and conclude that the protocols are not ready for deployment on open networks. The results also help us understand the limitations and design options for Bloom-?lter forwarding.
关键词： network-level security and protection,Multicast,network protocols
更新于2025-09-23 15:19:57
-
Performance Problem of Current Differential Protection of Lines Emanating from Photovoltaic Power Plants
摘要： The amplitude and phase angle of the fault current in photovoltaic power plants (PVPPs) are significantly influenced by the control system of the grid-connected inverters, unlike in a conventional synchronous source. Hence, PVPPs may adversely affect the performance of the current differential protection designed for synchronous sources-based power grids. In order to study the performance problem of current differential protection on AC transmission lines, an analytical expression of the fault current in the PVPPs was deduced, and the fault current characteristic was extensively analyzed. Based on this analysis, the ratio of differential current over restraint current was initially derived in this study; this ratio is observed to be affected by the control system parameters, power grid system parameters, fault resistance, and fault types. Moreover, the dynamic characteristics of this ratio can be clearly observed based on a three-dimensional diagram. Furthermore, the operating performance of the current differential protection was analyzed under different influencing factors. The mathematical analysis presents that the amplitude ratio of the fault current on both sides of the line is larger than nine and that current differential protection will operate reliably in any case. Meanwhile, the theoretical analysis and simulation results show that the current phase angle difference may become an obtuse angle in case of an ungrounded fault, which will cause inaccurate operation of the current differential protection. The results of this study will provide guidance for the engineering application of current differential protection in case the PVPPs are connected to a power grid.
关键词： performance problem,photovoltaic power plants,current differential protection,fault current behavior
更新于2025-09-23 15:19:57
-
[IEEE 2019 IEEE 46th Photovoltaic Specialists Conference (PVSC) - Chicago, IL, USA (2019.6.16-2019.6.21)] 2019 IEEE 46th Photovoltaic Specialists Conference (PVSC) - Developing Inkjet Printed PEDOT/PSS Films for Solar Cells
摘要： This paper deals with the impact of a gas discharge arrester's electrodes' shapes on its performance. When after extinguishing the electric arc between the electrodes of the gas discharge arrester and the electric-field strength between the electrodes exceeds the critical value, reignition occurs. Computation of the electric-field strength between the electrodes of the existing gas discharge arresters using the finite elements method shows that electric-field strength reaches its highest values at the edges of the electrodes. It therefore makes sense to reduce the electric-field strength at the edges of the electrodes by changing the electrodes' shapes. This also reduces the risk of reigniting the electric arc between the electrodes and improves the arrester's ability to self-extinguish. The electrodes can be geometrically shaped in such a way that ensures much uniform distribution of the electric-field strength as possible. This paper describes the model of a gas discharge arrester and the use of a differential evolution optimization algorithm for computation of the more adequate shapes of electrodes. Thus, uniform distribution of the electric-field strength is ensured between the gas discharge arrester electrodes.
关键词： optimization methods,Finite-element methods,overvoltage protection,gas discharge arrester (GDA)
更新于2025-09-23 15:19:57
-
[IEEE 2019 International Conference on Microwave and Millimeter Wave Technology (ICMMT) - Guangzhou, China (2019.5.19-2019.5.22)] 2019 International Conference on Microwave and Millimeter Wave Technology (ICMMT) - Side Excited Spoof Localized Surface Plasmonic Resonator with ultra-high Q factor
摘要： The Kirchhoff-Law-Johnson-Noise unconditionally secure key exchanger is a promising, surprisingly simple, very low cost and efficient electronic alternative to quantum key distribution. A few resistors, switches, and interconnecting cables can provide unconditionally secure data transmission in the ideal case by utilizing the thermal noise of the resistors. The key problems regarding practical realizations are related to the resistance tolerance, finite cable resistance, and other non-ideal properties that can cause information leak. In this paper, we present robust protection from cable resistance and resistance mismatch attacks against the system. Our theoretical results show that all resistive inaccuracies, parasitic resistances, cable resistance, and temperature dependence can be compensated; therefore, the practical implementation becomes much easier. The generalized method provides inherent protection against the so-called second law attack as well.
关键词： KLJN secure key exchanger,Unconditional security,attack protection,secure key exchange
更新于2025-09-23 15:19:57
-
[IEEE 2019 Photonics & Electromagnetics Research Symposium - Fall (PIERS - Fall) - Xiamen, China (2019.12.17-2019.12.20)] 2019 Photonics & Electromagnetics Research Symposium - Fall (PIERS - Fall) - A Novel 2D Plasmonic MoO <sub/>3</sub> Driven pH Sensor on Silicon Photonics Platform
摘要： Bloom-?lter-based forwarding has been suggested to solve several fundamental problems in the current Internet, such as routing-table growth, multicast scalability issues, and denial-of-service (DoS) attacks by botnets. The proposed protocols are source-routed and include the delivery tree encoded as a Bloom ?lter in each packet. The network nodes forward packets based on this in-packet information without consulting routing tables and without storing per-?ow state. We show that these protocols have critical vulnerabilities and make several false security assumptions. In particular, we present DoS attacks against broad classes of Bloom-?lter-based protocols and conclude that the protocols are not ready for deployment on open networks. The results also help us understand the limitations and design options for Bloom-?lter forwarding.
关键词： network-level security and protection,Multicast,network protocols
更新于2025-09-23 15:19:57
-
[Lecture Notes on Data Engineering and Communications Technologies] International Conference on Intelligent Data Communication Technologies and Internet of Things (ICICI) 2018 Volume 26 || Global Fairness Model Estimation Implementation in Logical Layer by Using Optical Network Survivability Techniques
摘要： Optical communication network plays a predominant role in the life of the user(s) system by providing high demand i.e. digital signal levels, fair queuing and channel reuse for high capacity links. In optical communications, Optical Component and Parameter (OCP) are becoming more accurate in order to provide the significance of the optical devices. Optical networks are enhanced in order to afford the optical technologies connectivities to provide high end communication in terms of sustainability and survivability. In survivability concept, two layers plays a significant/vital role between source to destination i.e. end to end connectivities is much reliable in terms of node connectivities, flow connectivities hence local to global fair queuing is achieved with the lower bound to upper bound and vice versa. Further the path propagation determines the range of path propagation determines the range of packets and its estimation is measured by using the concept of node mobility and scalability. It achieves the global range of optical packet transmission reception and design issues in network architecture analysis.
关键词： Network Architecture Analysis (NAA),Optical Protection Restoration Scheme (OPRS),Spatial Channel Reuse (SCR),Optical Demand Distribution (ODD)
更新于2025-09-23 15:19:57
-
Functionalization of cotton fabric with bismuth oxyiodide nanosheets: applications for photodegrading organic pollutants, UV shielding and self-cleaning
摘要： A multifunctional cotton fabric was prepared by immobilizing bismuth oxyiodide (BiOI) nanosheets on the surface of cotton treated to briefly dissolve surface molecules with upon the low-temperature addition of NaOH and urea (cotton micro-dissolution). Immobilization was accomplished by successive adsorption and reaction (SILAR) at the temperature (* 25 °C). The morphology, structural characteristics, photodegradation ability for organic pollutants, UV shielding, and self-cleaning of the treated fabric were studied. The growth rate and uniformity of the BiOI nanosheets were compared between the treated fabrics and the untreated fabrics. The absorption wavelength of the cotton fabric with BiOI nanosheets was extended to the visible light (* 630 nm) region. Under visible light irradiation, cotton fabric containing BiOI nanosheets (BiOI > 8.4 wt%) showed remarkable photocatalytic ability for degrading rhodamine B (RhB) with a degradation rate of 99% (C0 = 20 mg/L) and 95% after the first and sixth cycle, respectively. The ultraviolet protection factor (UPF) of cotton fabric with BiOI nanosheets was > 50, and its transmittance of ultraviolet A (T(UVA)) was < 5%. The cotton fabric with BiOI nanosheets also exhibited superhydrophobic and self-cleaning properties. Thus, the cotton fabric with BiOI nanosheets has great potential for application as a multifunctional protective material.
关键词： BiOI nanosheets,Visible-light photocatalytic activity,Superhydrophobicity,Ultraviolet protection factor
更新于2025-09-19 17:15:36
-
[IEEE 2018 International Conference on Advances in Computing, Communications and Informatics (ICACCI) - Bangalore (2018.9.19-2018.9.22)] 2018 International Conference on Advances in Computing, Communications and Informatics (ICACCI) - A Novel Fiber-Constrained Protection Scheme for Passive Optical Networks
摘要： Due to increasing use of Internet in all walks of life user’s demand for fast and highly available Internet is rapidly increasing. Passive optical network (PON) is a key technology to satisfy the rapidly growing Internet traf?c demand in access networks. However, PON is highly prone to ?ber failures which may result to poor service availability to users. Therefore, PON needs to be protected to improve availability. During provisioning protection, a dedicated and geographically disjoint backup ?ber is deployed to protect each working ?ber, thereby requiring large number of backup ?bers. In practice, in densely populated urban areas, the working and backup ?bers are laid through the existing ducts and conduits, as digging of trenches and installation of ducts and conduits in dense urban areas are cost-exhaustive. Moreover, in many circumstances, digging of new trenches may not be permitted in dense urban areas. The existing ducts and conduits may be heavily congested due to existing copper wires and cables. Therefore, it is required to ef?ciently use the available space of existing ducts and conduits. In this regard, in this paper, we propose a novel protection scheme, referred to as multi-hop bypass-based protection (MHBP) scheme, wherein we provision to deploy the minimum number of backup ?bers to provide protection against working ?ber failure. Simulation results show that proposed protection scheme ef?ciently utilises the existing ducts and conduits.
关键词： backup ?ber,PON,multi-hop transmission,protection
更新于2025-09-19 17:15:36
-
[ASME ASME 2018 International Mechanical Engineering Congress and Exposition - Pittsburgh, Pennsylvania, USA (Friday 9 November 2018)] Volume 1: Advances in Aerospace Technology - Lightning Strike Protection and EMI Shielding of Fiber Reinforced Composite Using Gold and Silver Nanofilms
摘要： Carbon fiber reinforced composites are very much imperative to future-generation aircraft structures. However, lightning strike protection (LSP) and electromagnetic interference (EMI) are main concerns. Carbon fibers have very good mechanical properties with the best strength-to-weight ratio, but they are very poor conductors of electricity. These fibers must be reinvented to increase the surface conductance to provide high electrical conductivity to the aircraft structure. The present study deals with preparing composite sandwich structures of carbon fibers used for commercial nacelle applications subject to lightning strike effects with different metallic nanofilm of gold (Au) and silver (Ag) measuring approximately 100 nm. These metallic nanofibers were co-cured on the top layers of composite panels during vacuum curing process. In our laboratory, lightning strike results for a composite sandwich structure using nanofilms were obtained to observe lightning strike damage and structural tolerance necessary tolerance capability. the damage Resistance of composite panels with metallic nanofilm under various strains was studied. It was found that resistance of the metallic nanofilm increased under strain. The voltage was found to be low; hence, an increase in current would help to reduce the damage on composite panels due to lightning strikes, and the same theory would be applicable to EMI. No EMI was absorbed or reflected in the nanofilm using the P-static test. When lightning strikes were applied to composite coupons, the resulting damage from the currents was reduced on those with metallic nanofilms.
关键词： Lightning Strike Protection,Electromagnetic Interference,Composites,Metallic Nanofilms
更新于2025-09-19 17:15:36
-
Construction of ultraviolet protection, thermal insulation, superhydrophobic and aromatic textile with Al-doped ZnO–embedded lemon microcapsule coatings
摘要： Multifunctional textiles combining ultraviolet protection, thermal insulation, superhydrophobic and aromatic performance were successfully prepared using an aluminum-doped zinc oxide (AZO)-embedded lemon microcapsule and SiO2 dual-layer coating. AZO-loaded lemon microcapsules with average diameter of 1.5 mm were obtained via interfacial polymerization. Results showed that the high concentration of the AZO-embedded lemon microcapsule contributed to enhancing the waterproof property, aromatic performance, and visible and near-infrared light transmittance. The lemon content was up to 2.789 mg/g (weight of essence:weight of fabric). The water contact angle was high at 153.35°, exhibiting an outstanding superhydrophobic performance. The light transmittance decreased as the amount of AZO-embedded lemon microcapsule increased. The ultraviolet protection factor value reached 88.78 when the dosage of the AZO-embedded lemon microcapsule was 6%. Given the above research results, the cotton fabric coated with the AZO-embedded lemon microcapsule and SiO2 dual-layer composite coating would have potential applications in the water/oil purification field and functional protective fabrics.
关键词： AZO-embedded lemon microcapsule,aromatic textile,superhydrophobic,thermal insulation,ultraviolet protection
更新于2025-09-19 17:15:36