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The influence of coupling mode of methane leakage and debris input on anaerobic oxidation of methane

Acta Oceanologica Sinica 2021年第8期40卷 78-88页

作者： Rui Xie Daidai Wu Jie Liu Guangrong Jin Tiantian Sun Lihua Liu Nengyou Wu Key Laboratory of Gas Hydrate Guangzhou Institute of Energy ConversionChinese Academy of SciencesGuangzhou 510640China Guangzhou Marine Geological Survey China Geological SurveyMinistry of Natural ResourcesGuangzhou 510075China Institution of South China Sea Ecology and Environmental Engineering Chinese Academy of SciencesGuangzhou 510301China Evaluation and Detection Technology Laboratory of Marine Mineral Resources Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao 266237China Key laboratory of Gas Hydrate Ministry of Natural ResourcesQingdao 266071China

Anaerobic oxidation of methane(AOM) is an important biogeochemical process, which has important scientific significance for global climate change and atmospheric evolution. This research examined the δ^(34)S, terrigenous clastic indices of TiO_(2) and Al_(2)O_(3), and times for formation of the Ba front at site SH1, site SH3 and site 973-4 in the South China Sea. Three different coupling mechanisms of deposition rate and methane flux were discovered. The different coupling mechanisms had different effects on the role of AOM. At site 973-4, a high deposition rate caused a rapid vertical downward migration of the sulphate–methane transition zone(SMTZ), and the higher input resulted in mineral dissolution. At site SH3, the deposition rate and methane flux were basically in balance,so the SMTZ and paleo-SMTZ were the most stable of any site, and these were in a slow process of migration. At site SH1, the methane flux dominated the coupled mode, so the movement of the SMTZ at site SH1 was consistent with the general understanding. Understanding the factors influencing the SMTZ is important for understanding the early diagenesis process.

关键词： methane seep terrestrial detrital material anaerobic oxidation of methane gas hydrate

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Evidence for coupled iron and nitrate reduction in the surface waters of Jiaozhou Bay

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Journal of Environmental Sciences 2021年第10期33卷 70-83页

作者： Kunyu Ma Rujun Yang Shenglu Qu Yingying Zhang Yuan Liu He Xie Minghan Zhu Mengqi Bi College of Chemistry and Chemical Engineering Ocean University of ChinaQingdao 266100China School of Environmental Science and Engineering Yancheng Institute of TechnologyJiangsu 224051China Jiangsu Provincial Key Laboratory of Coastal Ecology and Pollution Control Yancheng 224051China

Iron and nitrate(NO_(3)^(-))are dominant physiologically required nutrients for phytoplankton growth,and iron may also play a key role in the marine nitrogen *** this study,we investigated the temporal and spatial distributions of dissolved iron(DFe)and Fe(Ⅱ)in the surface waters of Jiaozhou Bay(JZB)from April 2 to July 26,*** concentrations of DFe and Fe(Ⅱ)predominantly occurred in nearshore and estuarine stations and concentrations were generally higher in April and *** highest DFe concentration was observed along the coast of Hongdao(51.55 nmol/L)in May,while the lowest concentration was observed in the western coastal region(2.88 nmol/L)in *** highest and lowest Fe(Ⅱ)concentrations were observed in the Licun estuary(22.42 nmol/L)and outer bay(0.50 nmol/L)in May,*** calculated the proportions of nitrate,nitrite,and ammonium in dissolved inorganic nitrogen(DIN)as well as the ratio of Fe(Ⅱ)to DFe in all four *** mean Fe(Ⅱ)/DFe ratio was 0.48 in April,0.43 in May,0.69 in June,and 0.32 in *** mean ratio of NO_(3)^(-)to DIN was 0.78 in April,0.54 in May,0.20 in June,and 0.62 in ***_(3)^(-)/DIN continuously decreased in the first three months,while Fe(Ⅱ)/DFe remained high,which suggests that the reduction of iron and nitrate occurred simultaneously in the surface waters of JZB.

关键词： Iron Fe(Ⅱ) Jiaozhou Bay Flow injection chemiluminescence Redox Denitrification

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Leachate treatment using a demonstration aged refuse biofilter

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Journal of Environmental Sciences 2010年第7期22卷 1116-1122页

作者： Hongjiang Li Yingying Gu Youcai Zhao Zhiping Wen State Key Laboratory of Pollution Control and Resource Reuse Tongji University Shanghai 200092 China Shenzhen Environment Engineering Technology Center Shenzhen 518001 China Department of Civil Engineering The University of Hong Kong Pokfulam Road Hong Kong China

Approximately 7000 m^3 of aged refuse （AR） with a placement of over eight years was excavated from Shanghai Refuse Landfill, the largest landfill in China, and used for the construction of a two-stage bioreactor （AR biofilter） media for the biological treatment of 100 m3 of refuse landfill leachate. It was found that over 64% of COD, 96.9%-99.8% of NH4^＋-N, and 95.8%-99.8% of BOD5 could be removed by the AR biofilter, when the leachate with initial COD, BOD5, and NH4^＋-N concentrations were 986-4128 mg/L, 264--959 mg/L,m and 538-1583 mg/L, respectively. The corresponding concentrations in the effluent were reduced to below 30（000 mg/L, 2-12 mg/L, and 10-20 mg/L, respectively. The effluent was clear and pale yellow with suspended solid below 150 mg/L and color below 150 Pt/Co degree. Meanwhile, the total nitrogen removal was only 49%-63%, indicating a relative poor denitrification capacity of AR biofilter. The effluent pH was neutral and the population of Escherichia coli was less than 10^-1 CFU/mL. Hence, it was considered that the demonstration project can work well for the effective treatment of leachate.

关键词： aged refuse landfill leachate treatment COD ammonia

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Heteroatomic Modification of Solid-Waste-Based Mesoporous Carbon for Volatile Organic Compound Adsorption

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China Petroleum Processing & Petrochemical technology 2023年第1期25卷 66-78页

作者： Liu Jun Li Zhi Xu Ke Zhang Xinyang Li Yunpeng Wang Ya Zhang Yongfa Yang Song Liu Shoujun Li Junhua College of Chemistry Taiyuan University of TechnologyTaiyuan 030024 State Key Joint Laboratory of Environment Simulation and Pollution Control National Engineering Laboratory for Multi Flue Gas Pollution Control Technology and EquipmentSchool of EnvironmentTsinghua UniversityBeijing 100084 State Key Laboratory of Clean and Efficient Coal Utilization College of Chemical Engineering and TechnologyTaiyuan University of TechnologyTaiyuan 030024 Shandong Pengda Ecological Technology Co. Ltd.ZiboShandong 255420 Taiyuan Green Coke Energy Co. Ltd.Taiyuan 030006

Solid-waste-based activated carbon(AC)was utilized as a carbon source to synthesize a series of carbon-based functional material RAC-X(X=P and S,where P and S denote phosphoric and sulfuric acids,respectively).The toluene adsorption capacities of the regeneration AC(RAC)samples can be significantly improved by adopting the heteroatomic modification ***-P and RAC-S have the same specific surface area(1156 m^(2)/g)and similar porous ***,they have different toluene adsorption capacities,with 316.22 mg/g for RAC-P and 460.12 mg/g for RAC-S,which are 1.6 and 2.4 times greater than that for *** X-ray photoelectron spectroscopy measurements showed that the increase in the amount ofπ–π^(2)chemical bond over the AC surface results in the improvement of the toluene adsorption *** density functional theory results showed that the S-containing functional groups loaded near the defect sites of RAC-S promote toluene ***,reusability tests showed that RAC-S still retains 86%of its adsorption activity after four consecutive adsorption–desorption *** indicates that the heteroatomic modification method affords excellent toluene adsorption performance and recycling practicability,which not only is beneficial for achieving the rational utilization of solid waste resources but also provides a practical method for the efficient elimination of volatile organic compounds.

关键词： waste activated carbon toluene adsorption heteroatomic modification functional groups DFT analysis

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Mg/Ca,Ba/Ca,and S/Ca ratios as environmental and growth proxies for bivalve shells from the Haima cold seep,South China Sea

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Journal of Oceanology and Limnology 2023年第2期41卷 660-672页

作者： Jingya CAO Shengxiong YANG Danling TANG Junxi FENG Jinqiang LIANG Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou) Guangzhou 511458China Department of Ocean Science Hong Kong University of Science&TechnologyHong Kong 999077China MLR Key Laboratory of Marine Mineral Resources Guangzhou Marine Geological SurveyChina Geological SurveyMinistry of Natural ResourcesGuangzhou 511458China

Bivalve shell fossils,cemented by authigenic carbonates,are widely spread in the Haima cold seep,Qiongdongnan Basin of the South China Sea(SCS).In this study,we examined an element profile of Gigantidas platifrons in the Haima cold seeps at a water depth of 1381 *** on the scanning electron microscope(SEM)analyses,the prismatic layer and nacreous layer were identified,which are characterized by prismatic structure and stratified structure,*** addition,the profile can be subdivided into two parts:altered and unaltered *** inductively coupled plasma mass spectrometry(LA-ICP-MS)mapping shows that the element concentrations of the altered zones were influenced by the authigenic carbonate rocks,whereas the element concentrations of unaltered zones remain ***-situ X-ray diffraction(XRD)analyses show that the mineral constituent of the prismatic layer is mainly composed of *** with the growth profile,Mg/Ca ratios of unaltered zones have minor variations,ranging 0.72-0.97 mmol/mol(mean=0.87 mmol/mol),with estimated temperatures of 3.8-4.1℃,indicating that the temperature of the surrounding seawater remains constant and agree with the measured data of 3.9℃which was conducted by a conductivity-temperature-depth system(CTD).The minor variations of Ba/Ca ratios(0.01-0.06 mmol/mol;mean=0.04 mmol/mol)indicate a relatively stabilized salinity of the surrounding seawater.S/Ca ratios show large variations of 0.04-4.15 mmol/mol(mean=1.37 mmol/mol).S/Ca ratios have regular variations which generally correspond to the variations of the Mg/Ca ratios,highlighting that the S/Ca ratios of bivalve shells show the potential to reflect the growth rate of the ***,further studies should be carried out on the understanding of the links between the S/Ca ratios and seepage intensity of cold-seep fluids.

关键词： Mg/Ca,Ba/Ca,and S/Ca ratios laser inductively coupled plasma mass spectrometry(LA-ICPMS) Gigantidas platifrons Haima cold seep South China Sea

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Automatic LOD selection using viewpoint entropy

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International Journal of Modeling, Simulation, and Scientific Computing 2017年第2期8卷 275-289页

作者： Xiaodong Wang Fengju Kang Hao Gu College of Marine Engineering Northwestern Polytechnical University Xi’an 710072 P.R.China National Key Laboratory of Underwater Information Process and Control Xi’an 710072 P.R.China

Discrete Level of Detail (LOD) strategy is an effective solution for balancing the inherentcontradiction between quality and speed in computer graphics. However, application ofthis strategy requires both the appropriate selection approach and the visually comfortable transition procedure to reduce the popping effects introduced by switching betweendifferent levels. In this paper, a novel automatic LOD selection method based on viewpoint entropy was proposed. Firstly, the traditional calculation method of viewpointentropy contained in a scene was improved for the preprocessing of LOD models. Then,the runtime rendering scheme combined with our selection method was designed forbalance of frame rate during real-time rendering, and a novel smoothing LOD transitionstrategy based on Alternate Frame Rendered (ALR) was put forward for eliminationof popping effects. Finally, an example of complex scene combined with our proposalwas researched to verify its real-time performance and ability in holding continuity ofrendered images. Experimental studies show the effectiveness for stabilizing frame rateand improvements in reducing loss of continuity.

关键词： LOD selection viewpoint entropy smooth transition real-time rendering continuity.

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Application of OPC technology in supervisory system of marine electrical propulsion

Application of OPC technology in supervisory system of marin...

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Pacific-Asia Conference on Circuits, Communications and System

作者： Zhu, Jin Zhang, Xiumei Kang, Wei Key Lab of Marine Technology and Control Engineering Ministry of Communications PRC Shanghai Maritime University Shanghai 201306 China

ISBN: (纸本)9781457708565

In this paper, an intensive research was made into the OPC technology and the OPC Data access specification, then the application of OPC communications in the supervisory system of marine electrical propulsion was proposed to achieve data exchange between the field control station and operator station. The OPC Server was used to collect the state and key parameters of the control system, and the OPC client communication program was realized in the Delphi7.0 IDE, thus completing the supervisory and management of entire marine electrical propulsion system. Experimental results showed that the client has improved considerably in timeliness and satisfied the requirements of ship electric propulsion supervisory system which was more flexible and extensible. © 2011 IEEE.

关键词： Electronic data interchange

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0.75 Gbit/s high-speed classical key distribution with mode-shift keying chaos synchronization of Fabry–Perot lasers

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Light(Science & Applications) 2021年第9期10卷 1780-1788页

作者： Hua Gao Anbang Wang Longsheng Wang Zhiwei Jia Yuanyuan Guo Zhensen Gao Lianshan Yan Yuwen Qin Yuncai Wang Key Laboratory of Advanced Transducers and Intelligent Control System Ministry of Education and Shanxi ProvinceTaiyuanChina College of Physics and Optoelectronics Taiyuan University of TechnologyTaiyuanChina School of Information Engineering Guangdong University of TechnologyGuangzhouChina Guangdong Provincial Key Laboratory of Photonics Information Technology GuangzhouChina Center for Information Photonics and Communications School of Information Science and TechnologySouthwest Jiaotong UniversityChengduChina

High-speed physical key distribution is diligently pursued for secure *** this paper,we propose and experimentally demonstrate a scheme of high-speed key distribution using mode-shift keying chaos synchronization between two multi-longitudinal-mode Fabry–Perot lasers commonly driven by a super-luminescent *** users dynamically select one of the longitudinal modes according to private control codes to achieve mode-shift keying chaos *** two remote chaotic light waveforms are quantized to generate two raw random bit streams,and then those bits corresponding to chaos synchronization are sifted as shared keys by comparing the control *** this method,the transition time,i.e.,the chaos synchronization recovery time is determined by the rising time of the control codes rather than the laser transition response time,so the key distribution rate is improved *** experiment achieved a 0.75-Gbit/s key distribution rate with a bit error rate of 3.8×10^(−3)over 160-km fiber transmission with dispersion *** entropy rate of the laser chaos is evaluated as 16 Gbit/s,which determines the ultimate final key rate together with the key generation *** is therefore believed that the method pays a way for Gbit/s physical key distribution.

关键词： Gbit/s synchronization chaos

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A novel superhard boron nitride polymorph with monoclinic symmetry

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Communications in Theoretical Physics 2022年第6期74卷 159-167页

作者： Qing-Yang Fan Chen-Si Li Ying-Bo Zhao Yan-Xing Song Si-Ning Yun College of Information and Control Engineering Xi'an University of Architecture and TechnologyXi'an 710055China Shaanxi Key Laboratory of Nano Materials and Technology Xi'an 710055China School of Mechanical and Electrical Engineering Xi'an University of Architecture and TechnologyXi'an 710055China Key Laboratory of Ministry of Education for Wide Band-Gap Semiconductor Materials and Devices School of MicroelectronicsXidian UniversityXi'an 710071China Functional Materials Laboratory(FML) School of Materials Science and EngineeringXi'an University of Architecture and TechnologyXi'an 710055China

In this work,a new superhard material named Pm BN is *** structural properties,stability,mechanical properties,mechanical anisotropy properties,and electronic properties of Pm BN are studied in this *** BN is dynamically and mechanically stable,the relative enthalpy of Pm BN is greater than that of c-BN,and in this respect,and it is more favorable than that of T-B_(3)N_(3),T-B_(7)N_(7),tP24 BN,Imm2 BN,Ni As BN,and rocksalt *** Young's modulus,bulk modulus,and shear modulus of Pm BN are 327 GPa,331 GPa,and 738 GPa,respectively,and according to Chen's model,Pm BN is a novel superhard *** with its original structure,the mechanical anisotropy of Young's modulus of Pm BN is larger than that of C14 ***,the calculations of the electronic energy band structure show that Pm BN is a semiconductor material with not only a wide band gap but also an indirect band gap.

关键词： boron nitride polymorph superhard material wider band gap semiconductor firstprinciples calculations

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Reinforcement learning of serpentine locomotion for a snake robot

Reinforcement learning of serpentine locomotion for a snake ...

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2021 IEEE International Conference on Real-Time Computing and Robotics, RCAR 2021

作者： Qiu, Ke Zhang, Hang Lv, Yikai Wang, Yunkai Zhou, Chunlin Xiong, Rong School of Mechanical Engineering College of Electrical Engineering College of Control Science and Engineering Zhejiang University State Key Laboratory of Industrial Control Technology Hangzhou China

ISBN: (纸本)9781665436786

The locomotion control of the snake robot is a challenging task that involves many degrees of freedom. Consider the rhythmic behaviour, we introduce the central pattern generator (CPG) model to provide serpentine locomotion, since it can reduce the control dimensionality while remaining continuous and flexible. However, the model parameters are usually chosen empirically, which is time consuming and complicated. Thus, we apply deep deterministic policy gradient (DDPG) algorithm of reinforcement learning (RL) to tune the model and obtain optimal parameters. Consequently, the hyper-redundant snake robot performs graceful serpentine locomotion with an RL controller in simulation. The flexibility of our CPG model and the feasibility of DDPG algorithm are verified according to the experimental results. © 2021 IEEE.

关键词： Reinforcement learning

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