Using elliptical iron glycolate nanosheets as precursors, Fe3O4/C core–shell nanorings (NRs) [25 ± 10 nm in wall thickness, 150 40 length, and 1.6 0.3 long/short axis ratio] are synthesized via a one-pot hydrothermal route. The surface-poly(vinylpyrrolidone) (PVP)-protected-glucose reduction/carbonization/Ostwald ripening mechanism is responsible for NR formation. Increasing the glucose/precursor molar ratio can enhance carbon contents, causing linear decrease saturation magnetization (Ms)...

Investigation of high-efficiency electrocatalysts for acidic overall water splitting is great significance toward fulfillment proton exchange membrane (PEM) electrolyzers but still remains challenging. Herein, we report the colloidally synthesis IrCo alloy nanodendrites with petal-like architecture (NDs). Benefiting from unique hierarchical and strong electronic interaction arising synergistic alloying effect at atomic level, resultant IrCo0.65 NDs display remarkable hydrogen evolution...

1.8 nm monodisperse Ir nanoparticles have been prepared through a colloidal synthetic method, and further used as electrocatalysts for superior activity long-term stability toward overall water splitting in acidic media.

In contrast to most common methods used in optimal control of reservoir systems requiring a large number decision variables, parametric rule can make radical reduction the variables without yielding inferior solutions. However, employs standard operating policy determine releases reservoirs as much demand only if there is enough water system, which may result single periods severe short supply during droughts. The purpose this paper devise an for multireservoir system by combining with...

Abstract The purpose of this paper is to derive the general optimality conditions commonly used operating policies for reservoirs in parallel with joint water demand, which are defined terms system‐wide release rules and individual reservoir storage balancing functions. Following that, a new set proposed analytical forms by considering balance total delivery utility carryover value reservoirs. Theoretical analysis indicates that special case newly derived rules. then applied simulating...

This paper proposes a new storage allocation rule based on target curves. Joint operating rules are also proposed to solve the operation problems of multi-reservoir system with joint demands and water transfer-supply projects. The include diversion determine amount diverted in period, hedging an aggregated reservoir total release from system, specify each reservoir. A simulation-optimization model was established optimize key points curves, curves using improved particle swarm optimization...

Hedging is widely used to mitigate severe water shortages in the operation of reservoirs during droughts. Rationing usually instituted with one hedging policy, which based only on trigger, i.e., initial storage level or current availability. It may perform poorly balancing benefits a release period versus those carryover future This study proposes novel rule improve efficiency reservoir operated supply water, which, two triggers, initiated three different sub-rules through two-step approach....

Abstract Hedging rules of reservoir operations decide the timing and magnitude current water delivery reduction consequent carryover storage conservation based on tradeoff between utility future use. Different forms hedging can be used for release decision. This study presents general optimality conditions with convex, concave, linear relationships availability release, using criteria relative value marginal risk tolerance (MVRT) respect to versus storage. MVRT is quantified measure...

Abstract As The Times advances, innovating teaching methods, optimizing resources and building online offline blended environment have become the top priority. Therefore, this paper constructs a BOPPPS model based on active introduction, problem formation, pre-evaluation, participatory learning, evaluation feedback summary, which aims to help students deeply understand master key knowledge of course helps teachers effectively improve effect course. integrates education information technology...

It is hardly realistic to assume that, under all decision circumstances, followers will always choose a solution that leads the worst upper-level objective functional value. However, this generally accepted concept of pessimistic ill-posed bilevel programming problems may lead leader’s attitude being more vis à his anticipation follower’s non-antagonistic. result in wrong and greater potential cooperation space between leader followers. This paper presents new non-antagonistic with four...

Abstract A two-period model is widely used to derive optimal hedging rules for reservoir water supply operation, often with storage targets as the goal conserve future use. However, predetermined adopted in result shortsighted decisions without considering control of long-term operation. The purpose this paper propose a new seek more promising operation policy by embedding rule derived from an optimization program targets. Two modules are incorporated model: optimizing release each period...

In this paper, we study the equivalent conditions of complete moment convergence for sequences identically distributed extended negatively dependent random variables. As a result, extend and generalize some results obtained by Chow (Bull. Inst. Math. Acad. Sin. 16:177-201, 1988) Li Spătaru (J. Theor. Probab. 18:933-947, 2005) from i.i.d. case to sequences.

Abstract As copper (Cu) and zinc (Zn) usually occur in livestock wastewater, this study focused on metals adsorption struvite from swine wastewater the release properties of granular solution with varying pH conditions (2, 4, 7). The results demonstrated values presented a slightly decreasing trend increasing Cu/Zn ratio, Zn exhibited higher performance crystals than that Cu. Under high content ratios contributed to metal binding forms mechanisms, resulting difference leaching nutrients...

Abstract Under the background of large-scale popularization “Internet + Education”, personalized education mode based on artificial intelligence and other information technologies has become trend teaching reform development. In this paper, we have collected pre-processed students’ learning behaviors during Probability Theory Mathematical Statistics courses, established a large biological database these behaviors. The features are extracted using SHAP method, fused processed by MFCNN module....

The almost sure central limit theorems for the maxima of strongly dependent stationary Gaussian vector sequences are proved under some mild conditions. results extend ASCLT to and give substantial improvements weight sequence obtained by Lin (Electron. Commun. Probab. 14:224-231, 2009).

Injecting H2O2 into aquifers is a widely used in situ chemical oxidation (ISCO) technology for groundwater remediation. Dissolved silicate has been reported to decrease the reactivity of iron (III)-bearing minerals toward H2O2. In this study, effect naturally occurring levels dissolved (≤1 mM) on catalyzing hydrogen peroxide (CHP) with Fe(II) revaluated, and new observations that contradict previous studies are reported. Specifically, enhances CHP process minerals. presence minerals,...