Provider: - Institution: - Data provided by Europeana Collections- 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.- All metadata published by Europeana are available free of restriction under the Creative Commons CC0 1.0 Universal Public Domain Dedication. However, Europeana requests that you actively acknowledge and give attribution to all metadata sources including Europeana
Display omitted
•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.
Display omitted
•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.
Realizing efficient and stable overall water electrolysis is crucial for advancing efficient hydrogen production. However, developing electrocatalysts with both efficient hydrogen evolution reaction ...(HER) and oxygen evolution reaction (OER) performance under alkaline condition remains a significant challenge. Here, we report an innovative methodology for synthesizing FeO(OH)@NiC2O4 on nickel foam (NF) through a one-step hydrothermal method. Remarkably, FeO(OH)@NiC2O4/NF exhibits a remarkably low OER overpotential of 370 mV at a current density of 100 mA cm−2 and excellent electrochemical stability in OER. The cell voltage required for overall water splitting is lower than that of most reported catalysts. Detailed experiments reveal that the phase transition of FeO(OH) is induced through compositing, thereby significantly enhancing the catalytic performance.
Display omitted
•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.
Designing and constructing a high performance and multi-component nickel-based material is preferable for efficient energy storage devices. In this study, we reasonably designed a composite material, ...NiC2O4/NiCo layered double hydroxide (LDH), composed of 1D NiC2O4 nanorods and 3D NiCo-LDH nanoflowers self-assembled from nanosheets via a hydrothermal method. This causes NiCo-LDH nanoflowers to stretch out, increasing the specific surface area (up to 47 m2 g−1), improving contact with the electrolyte and providing abundant active sites, speeding up the transfer of protons. The excellent double redox reactions of NiC2O4 and NiCo-LDH expedite the reaction kinetics and boost electrochemical activities, resulting in high energy densities of 37.6 Wh kg−1 and high power densities of 809.8 W kg−1 for the NiC2O4/NiCo-LDH||AC hybrid supercapacitor devices. Furthermore, DFT calculations indicate NiC2O4/NiCo-LDH enhance the adsorption ability of OH−. And the improved electrochemical performance of NiC2O4/NiCo-LDH is due to partial electrons transfer through the interface.
We reasonable fabricated NiC2O4/NiCo-LDH nanoflowers through the two-step hydrothermal method applied to supercapacitors. Display omitted
•NiC2O4/NiCo-LDH nanoflower is synthesized by a simple hydrothermal method applies to supercapacitors.•NiC2O4/NiCo-LDH||AC shows excellent energy and power density.•The mechanism of NiC2O4/NiCo-LDH is simulated by DFT.•NiC2O4/NiCo-LDH is more favorable for the adsorption of OH− (Eads = −6.65 eV).
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.
Display omitted
•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.
PDF
