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Improving biodegradation potential of domestic wastewater by manipulating the size distribution of organic matter

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Journal of Environmental Sciences 2016年第9期28卷 174-182页

作者： Xiang Liu Qiuwen Chen liang zhu College of Environment Hohai University Center for Eco-Environmental Research Nanjing Hydraulic Research Institute

Carbon source is a critical constraint on nutrient removal in domestic wastewater ***,the functions of particulate organic matter（POM） and some organics with high molecular weight（HMW） are overlooked in the conventional process,as they cannot be directly assimilated into cells during microbial *** further aggravates the problem of carbon source shortage and thus affects the effluent ***,to better characterize organic matter（OM） based MW distribution,microfiltration/ultrafiltration/nanofiltration（MF/UF/NF） membranes were used in parallel to fractionate OM,which obtained seven *** acidification（HA） was adopted to manipulate the MW distribution of dissolved organic matter（DOM） and further explore the correlation between molecular size and *** showed that HA pretreatment of wastewater not only promoted transformation from POM to DOM,but also boosted *** 8 hr of HA,the concentration of dissolved organic carbon（DOC） increased by 65%,from the initial value of20.25 to 33.48 mg/L,and the biodegradability index（BOD5（biochemical oxygen demand）/SCOD（soluble chemical oxygen demand）） increased from 0.52 to *** MW distribution analysis and composition optimization,a new understanding on the characteristics of organics in wastewater was obtained,which is of importance to solving low C/N wastewater treatment in engineering practice.

关键词： Domestic wastewater treatment Hydrolysis acidification Carbon source Biodegradability Molecular weight distribution

聚己内酯的高选择性催化解聚和再聚合回收研究

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化学研究与应用 2024年第3期36卷 640-646页

作者：梁秀竹汤栋霖张水洞华南理工大学机械与汽车工程学院广东广州510640 华南理工大学材料科学与工程学院广东广州510640

由ε-CL单体催化开环聚合的聚己内酯(PCL)力学和生物相容性良好,广泛用于医疗领域。与生物降解处理方法相对比,对废弃的PCL塑料进行催化解聚回收ε-CL单体和对其进行开环再聚合的策略,可减少碳排放量,并充分利用这种高值的生物降解塑料... 详细信息

由ε-CL单体催化开环聚合的聚己内酯(PCL)力学和生物相容性良好,广泛用于医疗领域。与生物降解处理方法相对比,对废弃的PCL塑料进行催化解聚回收ε-CL单体和对其进行开环再聚合的策略,可减少碳排放量,并充分利用这种高值的生物降解塑料。本论文考察了五种不同催化剂对PCL化学解聚效率和产物的影响规律,发现以异辛酸亚锡能高效催化PCL化学解聚。继而深入考察异辛酸亚锡含量、温度和反应时间等参数对PCL热解聚行为的调控机理,采用液相色谱、MS和NMR等方法分析解聚产物的组成,通过热重分析表征其解聚活化能影响因素,阐述高选择性催化解聚PCL为ε-CL单体机理,并获得ε-CL单体回收率超过91%的实验参数。对解聚回收的ε-CL单体进行开环聚合制备PCL,采用^(1)H NMR,GPC,DMA、DSC、XRD和拉伸实验等分析方法对产物结构与性能进行表征,实验结果发现回收再聚合的PCL分子量、拉伸强度和断裂延展率分别超过50 Kda,20 MPa和800%,与PCL原料相当,具有再次使用的价值。

关键词：聚己内酯异辛酸亚锡催化解聚高选择性闭环回收

Preliminary design and optimization of slotted tube grain for solid rocket motor

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航空动力学报 2008年第12期23卷 2332-2340页

作者： K Nisar liang Guo-zhu A Kamran School of Astronautics Beijing University of Aeronautics and Astronautics Beijing 100191 China

In this paper,design and optimization technique of slotted tube grain for solid rocket motors has been *** doing so,the design objectives and constraints have been set,geometric parameters identified,performance prediction parameters calculated,thereafter preliminary designs completed and finally optimal design *** model for slotted tube grain configuration has been *** thrust has been taken as the objective function with constraints of burning time,mass of propellant,fixed length and diameter of chamber *** parameter method has been used for calculating the performance prediction parameters.A set of preliminary designs has been completed and an analysis of these results *** all the preliminary results fulfill the design requirements in terms of objective function and constraints,however in order to attain the optimal design,Sequential quadratic programming optimization technique has been *** the slotted tube grain geometry is totally dependent upon various independent variables and each of these variables has a bearing on explicit characteristic of grain designing,hence affects of the independent variables on performance parameters have been examined,thus variation laws have been *** on the variation laws and the analysis of preliminary design results,upper and lower limits have been defined for the independent geometric variables and an initial guess provided for conducting *** attained exhibits that an optimal result has been attained and the value of objective function has been *** the design constraint limits have also been met while ensuring sound values of volumetric loading fraction,web fraction and *** methodology of design and optimization of slotted tube grain for solid rocket motors can be used by engineers as a reference guide for actual design and engineering purposes.

关键词：固体火箭发动机动力系统设计方案

基于物联网技术的智能电源监控与管理系统研究

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通信电源技术 2024年第14期41卷 121-123,181页

作者：李雪阳朱良济南吉美乐电源技术有限公司山东济南250101

为保证智能电源监控与管理水平,实时掌握其运行状态,文章研究基于物联网技术的智能电源监控与管理系统。在该系统中,终端层负责采集智能电源的运行数据,通信层采用现场有线传输和远程无线传输结合的方式将采集的数据传送至平台层,而平... 详细信息

为保证智能电源监控与管理水平,实时掌握其运行状态,文章研究基于物联网技术的智能电源监控与管理系统。在该系统中,终端层负责采集智能电源的运行数据,通信层采用现场有线传输和远程无线传输结合的方式将采集的数据传送至平台层,而平台层采用多参数优化方法构建态势监控模型,计算智能电源的安全态势,实现电源监控,应用层则依据监控结果执行远程控制,实现智能电源监控与管理。由测试结果可知,该系统应用效果较好,满足智能电源监控与管理需求。

关键词：物联网技术智能电源监控与管理

Research of robust adaptive trajectory linearization control based on T-S fuzzy system

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Journal of Systems Engineering and Electronics 2008年第3期19卷 537-545页

作者： Jiang Changsheng Zhang Chunyu zhu liang College of Automation Nanjing Univ. of Aeronautics and Astronautics Nanjing 210016 P. R. China National Key Laboratory of Fire Control Technology Luoyang 471009 P. R. China

A robust adaptive trajectory linearization control （RATLC） algorithm for a class of nonlinear systems with uncertainty and disturbance based on the T-S fuzzy system is presented. The unknown disturbance and uncertainty are estimated by the T-S fuzzy system, and a robust adaptive control law is designed by the Lyapunov theory. Irrespective of whether the dimensions of the system and the rules of the fuzzy system are large or small, there is only one parameter adjusting on line. Uniformly ultimately boundedness of all signals of the composite closed-loop system are proved by theory analysis. Finally, a numerical example is studied based on the proposed method. The simulation results demonstrate the effectiveness and robustness of the control scheme.

关键词： nonlinear system trajectory linearization control robust adaptive control T-S fuzzy system.

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7自由度类肌腱驱动仿生机械臂的设计研究

模具制造 2024年第5期24卷 40-42,46页

作者：梁柱陈思涛佛山职业技术学院智能制造学院广东佛山528137

在科技不断发展的过程中,服务型机器人成为当下一大研究热点,针对老年群体及康复人群的多功能辅助机械臂呈现出广阔的发展眼前,备受社会关注。基于人体解剖学关节特点及7自由度手臂原理,应用被动运动的绳索张紧机构法,对类肌腱驱动机构... 详细信息

在科技不断发展的过程中,服务型机器人成为当下一大研究热点,针对老年群体及康复人群的多功能辅助机械臂呈现出广阔的发展眼前,备受社会关注。基于人体解剖学关节特点及7自由度手臂原理,应用被动运动的绳索张紧机构法,对类肌腱驱动机构进行开发设计,构建出仿人体上肢的机械臂张力放大机构,利用串并联混合腕部机构来模仿人体手腕,完成了肩关节模块化设计,打造出一种拥有恒定驱动力且末端精准灵活的类肌腱驱动仿生机械臂,实现仿生机械臂人际交互的安全及柔顺性,以期提高仿生机械臂肘关节的柔性张力,做到灵巧运用腕关节,弥补了传统绳索驱动机构下机械臂运动张力不足的弊端。

关键词： 7自由度类肌腱驱动仿生机械臂设计

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尼可地尔对老年AMI患者PCI术后造影剂诱导急性肾损伤的保护作用

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临床急诊杂志 2024年第1期25卷 13-18页

作者：龚敏朱亮丁士勤安徽理工大学附属新华医院(淮南新华医院)心内科安徽淮南232052

目的:探究尼可地尔对老年急性心肌梗死(acute myocardial infarction,AMI)患者经皮冠状动脉介入治疗(percutaneous coronary intervention,PCI)术后造影剂诱导急性肾损伤的保护作用。方法:选取2019年9月—2021年10月住院行PCI术的老年AMI患者141例,随机分为对照组、尼可地尔低剂量组和尼可地尔高剂量组,每组47例;对照组患者接受常规治疗方案(阿司匹林+氯吡格雷+水化治疗),尼可地尔低剂量组和尼可地尔高剂量组在对照组基础上,术前30 min至术后3 d服用尼可地尔,3次/d,低剂量组5 mg/次,高剂量组为10 mg/次。比较各组患者肾功能指标、氧化应激指标、炎性指标、核因子-E2相关因子2(nuclear factor erythtoid 2 related factor 2,Nrf2)/抗氧化响应元件(antioxidant response element,ARE)信号通路基因mRNA相对表达水平及造影剂诱导的急性肾损伤发生率。结果:各组造影剂诱导的急性肾损伤发生率比较,对照组明显高于尼可地尔低剂量组和尼可地尔高剂量组,差异有统计学意义(P0.05)。结论:尼可地尔可能对老年AMI患者PCI术后造影剂诱导的急性肾损伤具有保护作用,可能与尼可地尔调节Nrf2/ARE信号通路,发挥抗氧化应激及抗炎作用有关。

关键词：尼可地尔急性心肌梗死老年患者造影剂急性肾损伤

边云协同场景中基于动态属性权限的群组密钥协商协议

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电子学报 2024年第6期52卷 1911-1924页

作者：张启坤朱亮韩桂锋刘梦琪金保华李元章郑州轻工业大学计算机与通信工程学院河南郑州450002 华东师范大学软件工程学院上海200062 北京理工大学计算机学院北京100081

针对边云协同应用场景中多域间终端的安全通信、信息安全交换及安全资源共享等问题,提出一种基于动态属性权限的群组密钥协商(Group Key Agreement,GKA)协议,为应用场景中的群组终端之间建立了一条安全的通信信道.协议提出了一种密钥证... 详细信息

针对边云协同应用场景中多域间终端的安全通信、信息安全交换及安全资源共享等问题,提出一种基于动态属性权限的群组密钥协商(Group Key Agreement,GKA)协议,为应用场景中的群组终端之间建立了一条安全的通信信道.协议提出了一种密钥证实算法,解决了传统方案中密钥生成和密钥分发造成的安全隐患;采用隐藏属性认证技术实现对终端身份认证,同时,保障了终端的身份和属性信息不被泄露;采用属性基加密(Attribute-Based Encryption,ABE)与牛顿插值多项式相结合的方式,能够支持安全细粒度的GKA;采用非对称计算,将计算任务转移到边缘服务器上执行,减轻终端的计算量;利用区块链技术不可篡改的特性,实现终端身份和通信信息的完整性验证和数据的可追溯性.此外,该协议支持属性权限动态更新,保障群组密钥的新鲜性.通过与应用的文献进行对比分析,本协议在计算时间、计算能耗和通信能耗方面具有较好的性能.

关键词：边云协同群组密钥协商牛顿插值多项式属性基加密动态属性权限隐藏属性认证

π-Conjugated cyanostilbene-based optoelectric functional materials

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Chinese Chemical Letters 2016年第8期27卷 1155-1165,1465页

作者： Cheng Hang Hong-Wei Wu liang-liang zhu State Key Laboratory of Molecular Engineering of Polymers Department of Macromolecular ScienceFudan University

π-Conjugated organic luminescent materials are essential components for modern optical and photoelectric *** review mainly probes into the recent work in the progress of smart π-conjugated organic systems in the form of cyanostilbene and its derivatives,which can regulate its excellent features in response to a variety of physical or chemical stimuli（***,light,magnetism,electric field,polarity,pH and solvent environment）.As a result of its extensive applicability and adaptability,cyanostilbene and its derivatives have been planted into different structural architectures such as polymers,functional nanoparticles,solid membranes,supramolecular systems and so *** review will first give a general description of the preparation and characterization of cyanostilbenebased optoelectric luminophores and then focus on their peculiar functional properties in the need for advanced material applications,such as AIEE（aggregation-induced enhanced emission effect）,solidstate emission,photovoltaics,photolithography and photochromism to be further processed *** purpose of this review is to give a platform of practical organic materials,mostly cyanostilbene and its derivatives,based on stable aromatic derivatives,to contribute to the booming of modern π-conjugated photoelectric materials that integrate with contemporary physics,material chemistry,bioengineering,medical science and aerospace altogether.

关键词： Cyanostilbene Multi-mode stimuli-response Photoisomerization Intelligent materials Conjugated polymers Supramolecular electronics