Konec osemdesetih let je Jugoslavija spremenila koncept narodne zaščite in uvedla novo načelo, vse ljudske obrambe. V vseh vaseh, mestih, delovnih organizacijah in ustanovah so se oblikovali odbori ...splošnega ljudskega odpora (SLO), ki so se tudi usposabljali za obrambo pred vojno nevarnostjo in naravnimi nesrečami. Znamenito geslo pod katerim so se izvajale vse dejavnosti je bilo »NIČ NAS NE SME PRESENETITI! (NPP)«. Opremo, uniforme in tudi orožje so nabavile občine, ali delovne organizacije …Občasno so bila organizirana tudi tekmovanja med ekipami v znanju in spretnosti v praktičnem delu.Kasneje so bila takšna tekmovanja organizirana tudi skupaj z domicilno vojaško enoto, ali rezervnem sestavu JLA.Na sliki z regijskega tekmovanja v Ilirski Bistrici, (verjetno leta 1980), pred osnovno šolo D. Kette, foto Emil Maraž. Ekipa delovne organizacije Plame. Z leve: Mirjam Čendak, Sonja Štembergar, Majda Jursinovič, Nadja Petričič in Boža Rozman, ki je pomagala prepoznati članice ekipe. Tablo z napisom PLAMA drži četrtošolec Janko Čeligoj iz Osnovne šole Dragotina Ketteja.
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•NiC/Mo2C/NF electrode heterostructure was in situ constructed.•NiC/Mo2C nanorods array exhibits excellent HER activity (31 mV at 10 mA cm−2, 264 mV at 500 mA cm−2).•NiC/Mo2C showed ...long term durability with negligible potential change for 200 h.•Balances the adsorption/desorption energy of the H-reaction intermediate, reduces the dissociation energy.
The problem limiting the use of hydrogen evolution reactions in industry is the inability of electrocatalysts to operate stably at high current densities, so the development of stable and efficient electrocatalysts is important for hydrogen production by water splitting. By designing a rational interface engineering not only can the problem of limited number of catalytic sites in the catalyst be solved, but also can facilitate electron transfer, thus enhancing the efficiency of water splitting. Here, we designed a two-stage chemical vapour deposition method to construct NiC/Mo2C nanorod arrays on nickel foam to enhance the electrocatalytic ability of the catalysts, which exhibited efficient HER catalytic activity due to their special tentacle-like nanorod structure and abundant heterogeneous junction surfaces, which brought about abundant active sites as well as promoted electron transfer capability. The resulting catalysts provide current densities of 10, 100 and 500 mA cm−2 with overpotentials of 31, 153 and 264 mV, and exhibit excellent stability at current densities of 10 mA cm−2 for 200 h. This discovery provides a new idea for the rational design of catalysts with special morphologies.
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•Hierarchical NiC2O4/Ni(OH)2 nanospheres are synthesized via a simple two-step hydrothermal method as the positive electrode.•The porous biomass-derived carbon with the honeycomb ...structure is obtained from pine petals as the negative electrode.•Hierarchical NiC2O4/Ni(OH)2 nanospheres and the porous biomass-derived carbon possess a high specific capacity.•The hybrid supercapacitor exhibits excellent energy and power density.
The high-performance hybrid supercapacitor (HSC) with high power capability and stable cyclability is intensively pursued as a next-generation energy storage device. Here, a kind of hierarchical NiC2O4/Ni(OH)2 nanospheres, consisting of subunits of NiC2O4 nanorods and Ni(OH)2 nanospheres, are synthesized via a two-step hydrothermal method. The hierarchical NiC2O4/Ni(OH)2 nanosphere positive electrode, benefiting from the synergistic effect of unique hierarchical structure and built-in electric fields, significantly boosting electron transmission capability and accelerating the ion/electron transfer rate, delivers an excellent specific capacity of 668 C g−1 at 1 A g−1. In addition, the porous biomass-derived carbon (PBC) with the honeycomb structure from pine petals as the negative electrode shows a remarkable electrochemical performance, exhibiting a specific capacitance of 249.7 F g−1 at 1 A g−1. As such, an assembled HSC of NiC2O4/Ni(OH)2||PBC based on hierarchical NiC2O4/Ni(OH)2 nanospheres positive electrode and PBC negative electrode display a conspicuous energy density of 31.07 Wh kg−1, and a power density of 833.47 W kg−1 at a maximum potential window of 1.7 V. This innovative hierarchical engineering of double nickel-based composites with bio-carbon provides an advanced enlightenment for high-performance HSCs.
Modern computers’ network interface cards (NICs) are undergoing changes in order to handle greater data rates and assist with scaling problems caused by general-purpose CPU technology. The inclusion ...of programmable accelerators to the NIC’s data channel is one of the ongoing improvements that is particularly intriguing since it gives the accelerator the chance to take on a portion of the CPU’s network packet processing duties. Accelerators are frequently developed using platforms like field-programmable gate arrays because packet processing operations have severe latency requirements (FPGAs). When implementing packet processing activities, FPGAs’ gain for through put is the number of data packets being successfully sent per second and latency is the actual time those packets take. However, due to their restricted resources, programming may need to be shared throughout a variety of applications. We provide hXDP, a software solution for FPGAs that targets the Linux eXpress Data Path and performs packet processing functions outlined with the eBPF technology. While maintaining performance on par with top-tier CPUs, hXDP only uses a tiny portion from the field programmable gate arrays, which are semiconductor devices that are based around a matrix of configuration logic blocks (CLB) connected over programmable interconnects. However, we demonstrate that when aiming towards a purpose-built FPGA architecture, many extended Berkeley packet filters (eBPF) allow programmers to use Berkeley packet filter byte code that makes use of certain kernel resources and instruction set architecture, to collocate and even eliminate, with considerably productivity and effectiveness. On an FPGA NIC, we implement hXDP and test its effectiveness using authentic eBPF programmes from the real world. Our version consumes 15% of the FPGA resources and operates at 156.25 MHz. This can constantly change and lead to the act of identification, inspection, extraction, and manipulation so that a network may make more intelligent management decisions.
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•Core-shell NiC2O4@C/N-doped NiCoZn-LDH(NCO@C/N-LDH) structure was prepared by two-step hydrothermal process.•Carbon and nitride were directly doped into NiCoZn-LDH nanosheets as ...shell.•The assembled NCO@C/N-LDH//AC devices provided high energy storage capability.
Layered double hydroxides (LDHs) are promising cathode materials for supercapacitors due to high theoretical specific capacitance and unique layered structure. Constructing hierarchical core–shell structure for the multicomponent LDHs is an effective strategy to further utilize them. Herein, a novel hierarchical core–shell structure (NCO@C/N-LDH) was fabricated by direct-doping of C and N species into NiCoZn-LDH nanosheets (C/N-LDH) coved on NiC2O4 (NCO) arranged on the nickel foam via two-step hydrothermal method. The NCO as a backbone prevented C/N-LDH nanosheets from collapsing in charge/discharge process, while the C/N-LDH shell provided abundant active sites and exclusive access to electron/ion transport for accelerating the Faradaic reaction kinetics. The optimal NCO@C/N-LDH(2.0) displayed a remarkable electrochemical performance with a high specific charge of 1841.0C/g at 1 A/g and good rate capability. Furthermore, the as-fabricated NCO@C/N-LDH//AC device delivered a high energy density of 56.9 Wh kg−1 at power density of 800 W kg−1.
Electrocatalytic water splitting to hydrogen production is a hot research topic in clean energy. However, due to the slow kinetics of oxygen evolution as one of the semi-reactions of water splitting, ...it is urgent to develop high-performance and cheap bifunctional catalysts. In this paper, we propose an effective one-step hydrothermal method to synthesize Fe doped NiC2O4 nanorods on Ni foam, which exhibit excellent electrocatalytic performance and stability in alkaline electrolytes. The oxygen evolution reaction overpotential is only 231 mV at 50 mA cm−2 and hydrogen evolution reaction overpotential is only 151 mV at 10 mA cm−2, which is superior to that most NiFe-based catalysts. Furthermore, the overall water-splitting device constructed with Fe doped NiC2O4 as anode and cathode achieves a low voltage of 1.60 V at 10 mA cm−2. The contribution of its excellent performance comes from the increase of effective active area and the decrease of electron transportation resistance after Fe doping. This work provides important guidance for the development of NiFe based catalysts.
The emergence of the 2019 novel coronavirus (COVID-19) which was declared a pandemic has spread to 210 countries worldwide. It has had a significant impact on health systems and economic, educational ...and social facets of contemporary society. As the rate of transmission increases, various collaborative approaches among stakeholders to develop innovative means of screening, detecting and diagnosing COVID-19's cases among human beings at a commensurate rate have evolved. Further, the utility of computing models associated with the fourth industrial revolution technologies in achieving the desired feat has been highlighted. However, there is a gap in terms of the accuracy of detection and prediction of COVID-19 cases and tracing contacts of infected persons. This paper presents a review of computing models that can be adopted to enhance the performance of detecting and predicting the COVID-19 pandemic cases. We focus on big data, artificial intelligence (AI) and nature-inspired computing (NIC) models that can be adopted in the current pandemic. The review suggested that artificial intelligence models have been used for the case detection of COVID-19. Similarly, big data platforms have also been applied for tracing contacts. However, the nature-inspired computing (NIC) models that have demonstrated good performance in feature selection of medical issues are yet to be explored for case detection and tracing of contacts in the current COVID-19 pandemic. This study holds salient implications for practitioners and researchers alike as it elucidates the potentials of NIC in the accurate detection of pandemic cases and optimized contact tracing.
The biotreated effluent of landfill leachate still contains numerous refractory organic contaminants, which poses potential threats to human health and ecosystems. Influenced by landfill ages and ...other factors, the concentration of organic matter varies. Heterogeneous catalytic ozonation (HCO) is a promising technology for advanced wastewater treatment. Aiming to achieve the up−to−standard discharge of low−concentration landfill leachate (COD ≈ 108 mg·L−1) and improve the biodegradability of high−concentration landfill leachate (COD ≈ 1720 mg·L−1), the active component Fe was incorporated into a firm Ni−induced C−Al2O3−framework (NiCAF) composite support to synthesize a Fe−NiCAF catalyst for efficient catalytic ozonation. When the Fe−NiCAF dosage was 4 g·L−1, the gas flow rate was 0.5 L·min−1, and the ozone concentration was 20.0 mg·L−1, the COD of low−concentration landfill leachate effluent decreased to 43 mg·L−1, and the COD removal rate constant of low−concentration landfill leachate was 154% higher than that of pure ozone. For high−concentration landfill leachate with the BOD5/COD of 0.058, the COD removal efficiency in Fe−NiCAF/O3 increased from 39% to 57% compared with ozonation, and the effluent BOD5/COD increased to 0.282. Furthermore, the addition of hydrogen peroxide (H2O2) and peroxymonosulfate (PMS) can further enhance the treatment performance of Fe−NiCAF/O3 process and different strengthening mechanisms were revealed. The results indicated that surface hydroxyls on the Fe−NiCAF catalyst surface were the main catalytic sites for ozone, and hydroxyl radical (•OH) and singlet oxygen (1O2) were identified as the main reactive oxygen species for the removal of organics in landfill leachate. Adding H2O2 can promote the generation of •OH for nonselective degradation of various organics, while PMS mainly enhanced the production of 1O2 to decompose macromolecular humus. This work highlighted an efficient Fe−NiCAF ozone catalyst and an innovative peroxide intensified HCO strategy for the advanced treatment of landfill leachate.
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•Fe − NiCAF catalyzed ozonation was highly efficient for landfill leachate treatment.•The addition of H2O2 and PMS intensified Fe − NiCAF catalyzed ozonation.•The main reactive oxygen species in Fe − NiCAF catalyzed ozonation were •OH and 1O2.•H2O2 mainly promoted the generation of •OH with nonselective oxidation ability.•PMS can effectively enhance the production of 1O2 with mild oxidation ability.
Cloud services have shifted from monolithic designs to microservices running on cloud-native infrastructure with monitoring systems to ensure service level agreements (SLAs). However, traditional ...monitoring systems no longer meet the demands of cloud-native monitoring. In Alibaba's "double eleven" shopping festival, it is observed that the monitor occupies resources of the monitored infrastructure and even disrupts services. In this paper, we propose a novel monitoring system named for cloud-native monitoring. achieves zero overhead in collecting raw metrics using one-sided remote direct memory access (RDMA) and remedies network congestion by adopting a receiver-driven flow control scheme. also features a priority queue mechanism to meet different quality of service requirements and an efficient batch processing design to relieve CPU occupation. has been deployed and evaluated in four different clusters with heterogeneous RDMA NIC devices and architectures in Alibaba Cloud. Results show that achieves no CPU occupation at the monitored host and supports <inline-formula> <tex-math notation="LaTeX">1\sim10k</tex-math> </inline-formula> hosts with <inline-formula> <tex-math notation="LaTeX">0.1\sim1s</tex-math> </inline-formula> sampling interval using a single thread for network I/O. significantly relieves the incast issue and maintains <inline-formula> <tex-math notation="LaTeX">80\sim95\%</tex-math> </inline-formula> of bandwidth utilization in several clusters when monitoring <inline-formula> <tex-math notation="LaTeX">1k</tex-math> </inline-formula> hosts. also ensures services with high priority accomplish collecting metrics earlier than low priority ones by at least <inline-formula> <tex-math notation="LaTeX">400 \mu s</tex-math> </inline-formula> when monitoring <inline-formula> <tex-math notation="LaTeX">1k</tex-math> </inline-formula> hosts.
As an important component of aviation turbine engines, abradable sealing coatings have the function of protecting turbine blades and improving engine efficiency. However, Abradable Sealing Coating ...systems (ASCs) are often damaged by corrosion in their applications, which may cause safety accidents. This article uses atmospheric plasma spraying technology to prepare NiCrAl–NiC ASC system, which is divided into three layers with a porous structure on the top. In order to fully explore the corrosion behavior of NiCrAl–NiC ASC system, corrosion tests were conducted on the ASC system using immersion method. The corrosion potential of this coating system is −0.96V, and a low corrosion potential indicates that the coating is more prone to corrosion. On the other hand, its current density is 51.64 × 10−6 A cm−2, indicating a slower corrosion rate of the coating. After immersion for 600 h, the corrosive medium Penetrated into the interior of the coating, forming interlayer corrosion. The electrochemical impedance results showed that the corrosion process of the coating was divided into three stages, and the impedance fitting results were consistent with the changes in coating porosity during the immersion process. The corrosion products of the coating are oxygen-containing compounds of various metal elements, including Al2O3, Al (OH)3, NiO, Ni(OH)2, and Cr2O3. The porous, multi-layered, and multiphase characteristics of coatings result in their unique corrosion behavior.
•The multi-layer structure of coatings affects the corrosion process.•Corrosion penetrates into the interior of the coating.•Porosity is a key factor in the corrosion process.•OCP results show that the coating structure is reasonable.
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