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Harnessing“little mighty”cockroaches:Pest management and beneficial utilization

The Innovation 2023年第6期4卷 17-18页

作者： Chonghua ren Nan Chen Sheng Li Guangdong Provincial Key Laboratory of Insect Developmental Biology and Applied Technology Guangzhou Key Laboratory of Insect Development Regulation and Application ResearchInstitute of Insect Science and Technology&School of Life SciencesSouth China Normal UniversityGuangzhou 510631China Guangdong Laboratory for Lingnan Modern Agriculture Guangzhou 510631China Guangmeiyuan R&D Center Guangdong Provincial KeyLaboratory of Insect Developmental Biology and Aplied TechnologySouth China Normal UniversiyMeizhou 514779China

rationale backs up cockroaches being“little mighty”.Cockroaches belong to the insect order Blattodea and often serve as model organisms for hemimetabolous *** occupy a pivotal evolutionary position in studies of insect *** emergence of the last common ancestor of all extant cockroaches may date back to approximately 235 million years *** are a highly successful group of insects:about 5,000 living species have been *** the seismic continental drift during the ancient transition from Pangaea,cockroaches have undergone substantial invasion and distribution to all continents worldwide.1 The American cockroach(Periplaneta americana)and the German cockroach(Blattella germanica)are the most common and are closely synanthropic species,referred to as“little mighty”(a household name,xiao qiang,in China)because of their extreme vitality and *** rationale behind cockroaches’being considered“little mighty”can be attributed mostly to four biological characteristics(Figure 1).

关键词： mostly continent Figure

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Achieving Improved drilling Performance with Hole Cleaning technology in Horizontal Shale Gas Wells in Sichuan Basin of China

Achieving Improved Drilling Performance with Hole Cleaning T...

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2021 International Petroleum technology Conference, IPTC 2021

作者： Ji, Guodong Wang, Haige Huang, Hongchun Cui, Meng Yulong, Feixue Ma, Ying Sun, Xiaofeng CNPC Engineering Technology R&D Company Limited Research Institute of Petroleum Exploration and Development PetroChina China Northeast Petroleum University China

ISBN: (纸本)9781613997314

The horizontal section length of shale gas horizontal wells in Sichuan Basin in the south-west of China generally exceeds 2000m. Cuttings are apt to accumulate and form cuttings beds along such long and curve horizontal sections due to low cuttings carrying capacity, which often results in excessive torque and drag or even stuck pipes during drilling process. According to the statistics dada inthe period of Jan. - Oct. 2019, more than 25 stuck pipe incidents and 15 rotary steering tools loss in borehole were reported due to inefficient cuttings transportation in the long horizontal wells in Sichuan Basin. This paper studies the cuttings transportation and cuttings bed formation in horizontal wells. A prediction model for the distribution of cuttings bed was established. A monitoring and analysis software for the cuttings bed and cuttings cleaner with V-shaped spiral blades that is used to agitate the cuttings bed wasdeveloped. The software calculates the distribution and thickness of the cuttings bed according to the well trajectory, wellbore structure, drilling fluid characteristics, etc., and provides the optimal operating parameters for the removal of the cuttings bed by the rotating and reciprocating drill string. Then, the drill cuttings remover in the drill string moves to the predicted position of the drill cuttings, scrapes the drill cuttings and creates a swirling flow during the pipe rotation. The combined application of software and makeup remover can effectively solve the issue of borehole cleaning in long horizontal wells. One of the field applications was carried out in the well Ning 209H12, a shale gas horizontal well in Sichuan Basin. The well experienced excessive torque and drag issue during the tripping of drill string of long horizontal section. Thesoftware ran based on oil well data, and it determines the placement and thickness of cuttings beds in the well and calculates the optimal operating parameters for a flow rate of about 32L/s and a spee

关键词： Horizontal wells

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Accelerated Carbonation of Calcium Aluminate Cement (Cac)-Based Cementitious materials Using Additive Manufacturing

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SSrN 2024年

作者： Kim, Tae-Hyung Ye, Bora Lee, Myeung-Jin Jeong, Bora Yoo, Miyeon Cho, Inkyung Song, Aran Lee, Heesoo Kim, Hong-dae Green Materials and Processes R&D Group Korea Institute of Industrial Technology Ulsan44413 Korea Republic of Department of Material Science and Engineering Pusan National University Busan46241 Korea Republic of Carbon Neutral Technology R&D Department Korea Institute of Industrial Technology Cheonan31056 Korea Republic of Department of Mechanical Engineering Yeonsei University Seoul03722 Korea Republic of

Binder jet additive manufacturing produces three-dimensional shapes by jetting a binder or activator onto a powder bed. Calcium aluminate cement (CAC) powder was introduced to the powder bed as a binder, and 97% deionized water was used as an activator to successfully manufacture a CAC-based cementitious green body (CT-G). The addition of a small amount of nanosized silica fume improved the flowability of the powder and the wettability of the aggregate-cement mixture, enabling precise control of the rheological properties of the powder for binder jet additive manufacturing. CT-G underwent carbonation in a pressure reactor at 99.9% CO2, 4 bar pressure, and > 60% relative humidity, and at ambient temperature for 2, 12, 24, 48, and 72 h (CT-xC). The CT-24C sample showed significantly improved mechanical properties after a short period of carbonation of 24 h, and successfully immobilizing 12 wt% CO2 within the CAC-based material matrix. Therefore, the 3d-printed CAC-based cementitious material demonstrates the capability to immobilize CO2. © 2024, The Authors. All rights reserved.

关键词： Cements

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Advancements in Battery technology for Electric Vehicles: Integrating Machine Learning for Enhanced Performance 3

Advancements in Battery Technology for Electric Vehicles: In...

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3rd IEEE North Karnataka Subsection Flagship International Conference, NKCon 2024

作者： Saravanan, V. reddy, G. Bharath Parida, Ankita Chandana, K. Chandrasekar, P. Madhan, A. Saveetha Institute of Medical and Technical Sciences Saveetha School of Engineering Department of Nano Electronics Materials and Sensors Tamilnadu Chennai India Cvr College of Engineering Department of Mechanical Engineering Hyderabad India Vel Tech Rangarajan Dr.Sagunthala R&d Institute of Science and Technology Department of Eee Tamil Nadu Chennai India Velammal College of Engineering and Technology Department of Electrical and Electronics Engineering Tamil Nadu Madurai India

ISBN: (纸本)9798350364569

The development of batteries will have a major impact on how electric vehicles (EVs) evolve. The State of Charge (SoC) and State of Health (SoH) evaluations made by current Battery Management Systems (BMS) are frequently erroneous due to the use of antiquated algorithms. It results in inefficient use of energy and lower battery lifespans. To improve BMS performance, the research suggests a unique method that integrates machine learning (ML) techniques. ML models are trained to predict battery behavior more accurately and adaptively by utilizing extensive information from battery sensors, past usage logs, and environmental variables. Certain machine learning algorithms, such as LSTM for estimating SoC, SVM for evaluating SoH, and rL for optimizing charging, exhibit better performance metrics in comparison to conventional techniques. The results show significant improvements over the existing systems in terms of energy efficiency (+12 units), battery lifespan (+25 years), and charging time (-8 hours). The ML-integrated BMS offers dependable and sustainable electric transportation solutions in addition to improving EV performance. © 2024 IEEE.

关键词： State of charge

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robustly stable intermediate memory states in HfO_(2)-based ferroelectric field-effect transistors

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Journal of Materiomics 2022年第3期8卷 685-692页

作者： Chen Liu Binjian Zeng Siwei dai Shuaizhi Zheng Qiangxiang Peng Jinjuan Xiang Jianfeng Gao Jie Zhao Jincheng Zhang Min Liao Yichun Zhou Key Laboratory of Low Dimensional Materials and Application Technology of Ministry of Education School of Materials Science and EngineeringXiangtan UniversityXiangtan411105China College of Civil Engineering and Mechanics Xiangtan UniversityXiangtan411105China School of Advanced Materials and Nanotechnology Xidian UniversityXi'an710071China Integrated Circuit Advanced Process R&D Center and Institute of Microelectronics of Chinese Academy of Sciences Beijing100029China State Key Discipline Laboratory of Wide Band Gap Semiconductor Technology School of MicroelectronicsXidian UniversityXi'an710071China

Multilevel ferroelectric field-effect transistors(FeFETs)integrated with HfO_(2)-based ferroelectric thin films demonstrate tremendous potential in high-speed massive data storage and neuromorphic computing ***,few works have focused on the stability of the multiple memory states in the HfO_(2)-based *** we firstly report the write/read disturb effects on the multiple memory states in the Hf_(0.5)Zr_(0.5)O_(2)(HZO)-based *** multiple memory states in HZO-based FeFETs do not show obvious degradation with the write and read disturb ***,the retention characteristics of the intermediate memory states in HZO-based FeFETs with unsaturated ferroelectric polarizations are better than that of the memory state with saturated ferroelectric *** the deep analysis of the operation principle of in HZO-based FeFETs,we speculate that the better retention properties of intermediate memory states are determined by the less ferroelectric polarization degradation and the weaker ferroelectric polarization *** experimental and theoretical evidences confirm that the long-term stability of the intermediate memory states in HZO-based FeFETs are as robust as that of the saturated memory state,laying a solid foundation for their practical applications.

关键词： Ferroelectric fieldeffect transistors(FeFETs) Hf_(0.5)Zr_(0.5)O_(2)(HZO) Multiple memory states Write/read disturb retention

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Computational Study on Adsorption and Separation of H2/CH4/CO2 in double-Walled Metal-dipyrazole Frameworks

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SSrN 2024年

作者： Li, Xiao-dong Yan-Yu, Xie Yang, Peng-Hui Huang, Xiao-Yu Liu, Xiu-Ying R&D Center for Advanced Energy Materials School of Physics Henan University of Technology Zhengzhou450001 China College of Physics and Electronic Engineering Nanyang Normal University Nanyang473061 China

We utilized density functional theory to comprehensively analyze the structural characteristics of six highly stable, double-walled dipyrazole metal-organic framework (MOF), BUT-53 to BUT-58. Molecular simulation techniques were employed to study the adsorption and separation performance of these novel structures for hydrogen H2, CH4 and CO2. We accurately characterized the material structure by integrating quantum mechanical calculations and classical force field simulations. The results revealed that these BUTs exhibited a large specific surface area (1068 – 1780 cm2·g-1), high porosity (0.27 – 0.44 cm3·g-1), and suitable pore size (4.34 – 8.15 Å), all of which are advantageous for gas separation. We calculated the gas adsorption and separation capacity at both 77 and 298 K by employing grand canonical Monte Carlo (GCMC) simulations. The six double-walled structures demonstrated a higher adsorption capacity for CH4 compared to H2. The BUT-57 exhibited the best performance for a single component among these structures, and the BUT-53 displayed excellent selectivity for CO2. We put forward an innovative concept of enhancing the selectivity for CO2 by increasing the accessible nitrogen sites of porous MOFs for providing valuable guidance for related experiments. © 2024, The Authors. All rights reserved.

关键词： density functional theory

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depositional process of hyperpycnal flow deposits:A case study on Lower Cretaceous Sangyuan outcrop in the Luanping Basin,Northeast China

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China Geology 2024年第3期7卷 505-516页

作者： de-zhi Yan ru-kai Zhu Hao Shou Zhao-hui Xu Wei-hong Liu Si-cheng Zhu Zhi-cheng Lei Jing-ya Zhang Chang Liu Yi Cai Huai-min Xu Research Institute of Petroleum Exploration and Development PetroChinaBeijing 100083China National Energy Tight Oil and Gas R&D Center Beijing 100083China PetroChina Key Laboratory of Oil and Gas Reservoir Beijing 100083China State Key Laboratory of Petroleum Resources and Prospecting China University of Petroleum(Beijing)Beijing 102249China College of Geosciences China University of Petroleum(Beijing)Beijing 102249China Jiangxi Engineering Laboratory on Radioactive Geoscience and Big Data Technology Department of Information and EngineeringEast China University of TechnologyNanchang 330013China

Sedimentary process research is of great significance for understanding the distribution and characteristics of *** the detailed observation and measurement of the Sangyuan outcrop in Luanping Basin,this paper studies the depositional process of the hyperpycnal flow deposits,and divides their depositional process into three phases,namely,acceleration,erosion and *** the acceleration phase,hyperpycnal flow begins to enter the basin nearby,and then speeds up *** developed in the acceleration phase are *** addition,the original deposits become unstable and are taken away by hyperpycnal flows under the eroding *** a result,there are a lot of mixture of red mud pebbles outside the basin and gray mud pebbles within the *** the erosion phase,the reverse deposits are eroded and become thinner or even ***,no reverse grading characteristic is found in the proximal major channel that is closer to the source,but it is still preserved in the middle branch channel that is far from the *** entering the deceleration phase,normally grading deposits appear and cover previous *** final deposits in the basin are *** are reverse,and others are *** are superimposed with each other under the action of hyperpycnal *** analysis of the Sangyuan outcrop demonstrates the sedimentary process and distribution of hyperpycnites,and reasonably explain the sedimentary characteristics of *** is helpful to the prediction of oil and gas exploration targets in gravity flow deposits.

关键词： Hyperpycnal flow Sedimentary characteristics depositional process Gravity flow deposit Hyperpycnite red mud pebble Gray mud pebble Oil and gas exploration engineering Luanping Basin

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Intelligent evaluation of sandstone rock structure based on a visual large model

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Petroleum Exploration and development 2025年第2期52卷 548-558页

作者： rEN Yili ZENG Changmin LI Xin LIU Xi HU Yanxu SU Qianxiao WANG Xiaoming LIN Zhiwei ZHOU Yixiao ZHENG Zilu HU Huiying YANG Yanning HUI Fang PetroChina Research Institute of Petroleum Exploration&Development Beijing 100083China Artificial Intelligence Technology R&D Center of Exploration and Development CNPCBeijing 100083China National Key Laboratory for Multi-resources Collaborative Green Production of Continental Shale Oil Daqing 163000China PetroChina Tarim Oilfield Company Korla 841000China Xinjiang Key Laboratory of Ultra-deep Oil and Gas Korla 841000China Research Institute of Petroleum Exploration and Development PetroChina Huabei Oilfield CompanyRenqiu 062552China Peking University Beijing 100871China No.6 Oil Production Plant PetroChina Changqing Oilfield CompanyXi’an 710200China

Existing sandstone rock structure evaluation methods rely on visual inspection,with low efficiency,semi-quantitative analysis of roundness,and inability to perform classified statistics in particle size *** study presents an intelligent evaluation method for sandstone rock structure based on the Segment Anything Model(SAM).By developing a lightweight SAM fine-tuning method with rank-decomposition matrix adapters,a multispectral rock particle segmentation model named CoreSAM is constructed,which achieves rock particle edge extraction and type *** upon this,we propose a comprehensive quantitative evaluation system for rock structure,assessing parameters including particle size,sorting,roundness,particle contact and cementation *** experimental results demonstrate that CoreSAM outperforms existing methods in rock particle segmentation accuracy while showing excellent generalization across different image types such as CT scans and core *** proposed method enables full-sample,classified particle size analysis and quantitative characterization of parameters like roundness,advancing reservoir evaluation towards more precise,quantitative,intuitive,and comprehensive development.

关键词： sandstone rock structure intelligent evaluation Segment Anything Model fine-tuning particle edge extraction type identification

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Modes of multi-mechanistic gas diffusion in shale matrix at varied effective stresses:Observations and analysis

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Petroleum Science 2023年第5期20卷 2908-2920页

作者： Tian-Yu Chen Yan-Yu Hao derek Elsworth Hong-Ming Zhang Zhi-Ming Hu Guang-Lei Cui Key Laboratory of Ministry of Education on Safe Mining of Deep Metal Mines School of Resources and Civil Engineering and Key Laboratory of Liaoning Province on Deep Engineering and Intelligent TechnologyNortheastern UniversityShenyang110819LiaoningChina National Energy Shale Gas R&D(experiment)Center Langfang065007HebeiChina Department of Energy and Mineral Engineering EMS Energy Institute and G3 CenterPennsylvania State UniversityUniversity ParkPA16802USA Research Institute of Petroleum Exploration&Development PetroChina Company LimitedBeijing100084China

Gas diffusion in the shale matrix has a dominant effect on late-stage production from shale gas ***,adequate research on the mechanisms and contributions of gas diffusion for varied pore size populations in shale matrix under recreated in situ stress is *** report gas-diffusion measurements under constant in situ stress but variable gas pressures for contrasting non-adsorbent(helium(He))and adsorbed(methane(CH_(4)))gases to investigate the impact of effective stress on the evolution of dominant mechanisms of *** intact sample replicates true pore-network topology and diffusion *** integrated diffusion model is proposed that combines the effects of slip flow,Knudsen flow,and surface diffusion to constrain the evolution of these flow regimes and their respective contributions to the observational ***,a probability density function(PdF)is employed to separate the gas content distributions of macropores and micropores from the total gas content and to investigate gas contributions in various *** results reveal that the diffusion coefficients of both He and CH_(4) in macropores and micropores increase with gas pressure but decrease with increasing effective *** diffusion coefficients of He and CH_(4) are different in macropores but remain nearly the same in *** diffusion coefficients of slip flow and surface diffusion increase with decreasing effective stress except for CH_(4) diffusion in the micropores,while the evolution of Knudsen diffusion shows the opposite *** flow plays a dominant role in He and CH_(4) diffusion within macropores(pore size 45 nm).Knudsen diffusion gradually becomes significant for He diffusion in the micropores(pore size 4 nm),conversely,for CH_(4) diffusion in the micropores,surface diffusion becomes *** to gas production from reservoirs,the contributions of the micropores will increase gradually with the duration of gas recovery,indicating the significan

关键词： diffusion coefficient In situ stress Varied pore types diffusion mechanisms Gas-content contributions

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Ultra Low Loss and Low Crosstalk MCF with Standard Cladding diameter

Ultra Low Loss and Low Crosstalk MCF with Standard Cladding ...

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2022 IEEE Photonics Society Summer Topicals Meeting Series, SUM 2022

作者： Takahashi, Masanori Maeda, Koichi Aiso, Keichi Mukasa, Kazunori Soma, daiki Takahashi, Hidenori Tsuritani, Takehiro Mitrovic, Miranda Palsdottir, Bera Arasitani, Yoshihiro Telecommunications & Energy Laboratories Furukawa Electric Co. Ltd. Chiba Japan Advanced Technology Laboratory Kddi Research Inc. Saitama Japan R&d Product Development Ofs Fitel Denmark ApS Brondby Denmark

An uncoupled 125-μm-cladding 4-core multicore fiber (MCF) with low attenuation loss of 0.155dB/km is reported. Span loss of 60.2km MCF is reduced to less than 10dB including fan-in and fan-out. Inter core crosstalk o... 详细信息

ISBN: (纸本)9781665434898

关键词： Crosstalk

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