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您的检索式：作者名="Runhu Zhang"
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| 1 | Removal of chromium (Ⅵ) from aqueous solutions using quaternized chitosan microspheres显示文摘In this study, quaternized chitosan microspheres(QCMS) were prepared and its Cr(VI) removal potential was investigated. Batch experiments were conducted to examine kinetics, adsorption isotherm, p H effect,and thermodynamic parameters. Equilibrium was attained within 50 min and maximum removal of 97.34%was achieved under the optimum conditions at p H 5. Adsorption data for Cr(VI) uptake by the QCMS were analyzed according to Langmuir, Freundlich, and Temkin adsorption models. The maximum uptake of Cr(VI)was 39.1 mg·g^(-1). Thermodynamic parameters for the adsorption system were determinated at 293 K, 303 K,313 K and 323 K.(ΔH° = 16.08 k J·mol^(-1);ΔG° =- 5.84 to- 8.08 k J·mol^(-1)and ΔS° = 74.81 J·K^(-1)·mol^(-1)).So the positive values of both ΔH° and ΔS° suggest an endothermic reaction and increase in randomness at the solid–liquid interface during the adsorption. ΔG° values obtained were negative indicating a spontaneous adsorption process. The kinetic process was described by a pseudo-second-order rate equation very well. The results of the present study indicated that the QCMS could be considered as a potential adsorbent for Cr(VI) in aqueous solutions. | Chao Hua Runhu Zhang Fang Bai Ping Lu Xiangfeng Liang | 2017 | Chinese Journal of Chemical Engineering2017，25，2： | 4 |
| 2 | Studies on Chro- mium (VI) adsorption on sulfonated lignite显示文摘 | Zhang Runhu Wang Bo Ma Hongzhu | 2010 | Desali- nation2010，255，： | 1 |
| 3 | Smart Contract Based DDoS Attack Traceability Audit Mechanism in Intelligent IoT显示文摘In this paper,we focus on providing data provenance auditing schemes for distributed denial of service(DDoS)defense in intelligent internet of things(IoT).To achieve effective DDoS defense,we introduce a two-layer collaborative blockchain framework to support data auditing.Specifically,using data scattered among intelligent IoT devices,switch gateways self-assemble a layer of blockchain in the local autonomous system(AS),and the main chain with controller participation can be aggregated by its associated layer of blocks once a cycle,to obtain a global security model.To optimize the processing delay of the security model,we propose a process of data pre-validation with the goal of ensuring data consistency while satisfying overhead requirements.Since the flood of identity spoofing packets,it is difficult to solve the identity consistency of data with traditional detection methods,and accountability cannot be pursued afterwards.Thus,we proposed a Packet Traceback Telemetry(PTT)scheme,based on in-band telemetry,to solve the problem.Specifically,the PTT scheme is executed on the distributed switch side,the controller to schedule and select routing policies.Moreover,a tracing probabilistic optimization is embedded into the PTT scheme to accelerate path reconstruction and save device resources.Simulation results show that the PTT scheme can reconstruct address spoofing packet forward path,reduce the resource consumption compared with existing tracing scheme.Data tracing audit method has fine-grained detection and feasible performance. | Zhuohao Wang Weiting Zhang Runhu Wang Ying Liu Chenyang Xu Chengxiao Yu | 2023 | China Communications2023，20，8： | 0 |
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