检索结果-内蒙古大学图书馆

57th US Rock Mechanics/Geomechanics Symposium

作者： Shen, Xinyu Liu, Sen Su, Qiang Mi, Guangyong Deng, Haibo Engineering Technology Research Institute PetroChina Southwest Oil & Gas Field Company 610031 China Development Division PetroChina Southwest Oil & Gas Field Company 610011 China Tight Oil & Gas Exploration and Development Program PetroChina Southwest Oil & Gas Field Company 610051 China

ISBN: (纸本)9780979497582

Push-the-bit rotary steerable system (RSS) is a guide technology that realizes directional drilling by controlling the eccentric mechanism to push against the borehole wall. However, the control effect of push-the-bit RSS is often not satisfactory in many interference factors, such as rock anisotropy and trajectory deviation. An intelligent switch control algorithm based on push RSS is proposed to achieve a smooth trajectory, stable control, and efficient decision-making. Firstly, the control rules of thrust force and thrust orientation are given according to the actual drilling situation. Next, the decision results are substituted into the borehole trajectory prediction model to achieve an accurate prediction of the trajectory to be drilled. Finally, the intelligent switch and mechanical control effect are simulated using field data, and the control precision, trajectory complexity, calculation time, and other aspects are analyzed comprehensively. The results show that the on-off control algorithm can effectively overcome the influence of the system and other interference and get a smooth well trajectory. It also has high robustness and system response, helping to reduce the distance deviation between the wellbore trajectory and the designed trajectory. © 2023 57th US Rock Mechanics/Geomechanics Symposium. All Rights Reserved.

关键词： Trajectories

来源：评论

学校读者我要写书评

暂无评论

Pulse Repetition Rate and Unwrapping Limits in OTDR Fiber Optic Sensing Systems

Pulse Repetition Rate and Unwrapping Limits in OTDR Fiber Op...

引用

IEEE SENSORS

作者： Danilo Fernandes Gomes Beatriz Brusamarello Guilherme Heim Weber Daniel Rodrigues Pipa Jean Carlos Cardozo da Silva Sergio Taveira de Camargo Junior Manoel Feliciano da Silva Junior Cicero Martelli Federal University of Technology-Parana (UTFPR) Parana Brazil Petrobras Research and Development Program Rio de Janeiro Brazil

ISBN: (数字)9798350363517

ISBN: (纸本)9798350363524

This study investigates the effect of pulse repetition rate (RR) on the accuracy of strain reconstruction in distributed acoustic sensing systems (DAS) using OTDR with heterodyne detection. Experimental evaluations at different values of RR reveal significant dependencies on the strain rate, which go beyond the simple dependence on bandwidth as already known from the Nyquist theorem. The findings underscore the necessity to optimize RR in order to guarantee the system's capacity to reconstruct dynamic strain signals and mitigate the constraints imposed by the phase unwrapping algorithm. Future research should focus on advancing phase unwrapping algorithms to improve performance at lower RR to ensure robust strain measurement capabilities in diverse industrial contexts.

关键词： Temperature sensors Temperature measurement Optical fibers Optical fiber sensors Accuracy Heuristic algorithms Strain measurement Sensors Monitoring Strain

来源：评论

学校读者我要写书评

暂无评论

Novel cubic heterojunction Fe2O3/ZnO composite for the photocatalyst application

引用

Materials Today: Proceedings 2023年 75卷 1-8页

作者： Hemnil, P. Prapawasit, Y. Karthikeyan, V. Wongwuttanasatian, T. Seithtanabutara, V. Energy Engineering Program Faculty of Engineering Khon Kaen University 40002 Thailand Mechanical Engineering Division Khon Kaen University Khon Kaen 40002 Thailand Center for Alternative Energy Research and Development Khon Kaen University Thailand Department of Chemical Division Khon Kaen University Khon Kaen 40002 Thailand

Dye Sensitize Solar Cell (DSSC) gained attention as a replacement for silicon solar cells owing to operational and economic benefits. This study aims to synthesize the Fe2O3/ZnO composites using two different methods;Hydrothermal-calcination (HTC) and Hydrothermal (HT) method. The prepared samples structural properties were analysed using XRD, SEM/EDX, BET, FTIR, and TGA. It was found that the HT-Fe2O3/ZnO composite had a lower crystalline peak with a higher specific area of 34.855 m2/g than HTC-Fe2O3/ZnO composite as the formation of ZnO and Fe2O3 was well hybrid structure via atomic substitution mechanism. The particle characterization of HTC-Fe2O3/ZnO showed that Fe2O3 surrounding ZnO and had the composition of Fe, Zn and O of 16.71 wt%, 62.90 wt% and 20.39 wt%, respectively. HT-Fe2O3/ZnO showed a cubic structure with higher content ot Fe (47.63 wt%), lower content of Zn (34.89 wt%) and O (17.48 wt%). Both composites prepared from HT and HTC methods attained high absorbency in the ultra-violet and visible range, advantageously HT-Fe2O3/ZnO exhibits better absorbance in the visible light range, thus, resulting in a band gap energy is lower to 2.98 eV. Therefore, HT-Fe2O3/ZnO material is recommended for DSSC to achieve higher performance. © 2022 Elsevier Ltd

关键词： Zinc oxide

来源：评论

学校读者我要写书评

暂无评论

A perspective review on the biosynthesis of plant-based secondary metabolites and their application as potent drugs

引用

BIOCELL 2024年第4期48卷 541-557页

作者： JHILAM PRAMANIK AKASH KUMAR SARVESH RUSTAGI MEHAK KATYAL SHEETAL THAKUR JUTISHNA BORA SUMIRA MALIK ANCHAL TREHAN NAYAN TALUKDAR PETR SLAMA Department of Food Technology ITM UniversityGwaliorIndia Department of Food Technology SRM UniversitySonipatIndia Department of Food Technology Uttaranchal UniversityDehradunIndia Department of Nutrition and Dietetics Manav Rachna International Institute of Research&Studies(MRIIRS)FaridabadIndia University Centre for Research and Development UIBTChandigarh UniversityMohaliIndia Amity institute of Biotechnology Amity UniversityJharkhandRanchiIndia Department of Biotechnology University Center for Research&Development(UCRD)Chandigarh UniversityMohaliPunjabIndia Department of Science Guru Nanak College of Pharmaceutical SciencesDehradunIndia Program of Biotechnology Faculty of ScienceAssam down town UniversityGuwahatiIndia Department of Animal Morphology Physiology and GeneticsMendel University in BrnoBrnoCzech Republic

Many phytochemicals and their derived metabolites produced by plants are extensively employed in commercial goods,pharmaceutical products as well as in the environmental and medicalﬁ***,these secondary metabolites obtained from plants are in low amounts,and it is difﬁcult to synthesize them at the industrial *** these challenges,they may be utilized for a variety of medicinal products that are either available in the market or are being researched and *** metabolites are complex compounds that exhibit ***,under controlled conditions with elicitors,desired secondary metabolites may be produced from plant cell *** review emphasizes the various aspects of secondary metabolites including their types,synthesis,and applications as medicinal *** article aims to promote the use of plant secondary metabolites in the management and treatment of various diseases.

关键词： Secondary metabolites Medicinal plant Synthesis Health benefits

来源：评论

学校读者我要写书评

暂无评论

New ent-kaurene and germacrene derivatives from Mesona procumbens Hemseley and their biological activity

引用

Natural Product research 2023年第13期37卷 2172-2180页

作者： Ganzon, Jerome G. Liaw, Chia-Ching Lin, Yu-Chi Lin, Zhi-Hu Wang, Chang-Hung Chen, Che-Yi Chuang, Kuo-Hsiang Kuo, Yao-Haur Division of Chinese Materia Medica Development National Research Institute of Chinese Medicine Taipei Taiwan Department of Biochemical Science and Technology National Chiayi University Chiayi Taiwan Ph.D. Program in Clinical Drug Development of Herbal Medicine Taipei Medical University Taipei Taiwan Graduate Institute of Pharmacognosy College of Pharmacy Taipei Medical University Taipei Taiwan Graduate Institute of Integrated Medicine College of Chinese Medicine China Medical University Taichung Taiwan Department of Research and Development Starsci Biotech Co. Ltd Taoyuan Taiwan

Mesona procumbens Hemseley is a well-known traditional herbal medicine used for heat-related ailments. In Taiwan, boiled extracts of M. procumbens are also used as desserts called grass jelly. In this study, the hexane extract from 75% EtOH of M. procumbens showed potent activities on inhibition of E. coli β-glucuronidase (eβG) and NO production and cytotoxicity against MCF-7 and HepG2 cancer cell lines. Furthermore, using various flash columns and HPLC chromatography on the bioactive layer led to the isolation of twelve compounds (1–12), including a new ent-kaurene, mesokaurol A (1), and a new germacrene derivative, mesogermapene A (2). Their structures were elucidated by extensive spectroscopic analyses, especially 2 D NMR and mass data. Biological assays showed that compound 9 (linolenic acid) had specific activity on inhibition of eβG (68.27%) at 100 µg/mL but was non-inhibitory to human β-glucuronidase. Compound 1 possessed significant cytotoxicity against MCF-7 (EC₅₀ = 9.76 µM) and HepG2 (EC₅₀ = 8.64 µM) cancer cell lines. © 2022 Informa UK Limited, trading as Taylor & Francis Group.

关键词： Anti-β-glucuronidase cytotoxicity germacrene Kaurane-type diterpene Mesona procumbens Hemseley

来源：评论

学校读者我要写书评

暂无评论

IoT and Peer-to-peer Signal Notification Methods Reduce the Time Needed to Detect Wildfire Heat Points 7

IoT and Peer-to-peer Signal Notification Methods Reduce the ...

引用

7th International Conference on Green Technology and Sustainable development, GTSD 2024

作者： Panlawan, Nattawat Somsak, Teerasak Thongpron, Jutturit Muangjai, Worrajak Ngaodet, Montri Assanavijit, Visut Thanin, Phiched Sungkham, Suriyon Oranpiroj, Kosol Patcharaprakiti, Noppom Somsak, Peeraya Nakaiam, Kan Program in Electrical Engineering Faculty of Engineering Rmutl Chiang Mai Thailand College of Integrated Science and Technology Rmutl Chiang Mai Thailand Research and Development Institute Rmutl Chiang Mai Thailand Faculty of Business Administration and Liberal Arts Rmutl Chiang Mai Thailand

ISBN: (纸本)9798350386073

The issue of dust and smoke resulting from forest fires in northern Thailand. This is caused by people burning the forest to get forest products. Individuals can start forest fires by intentionally burning the forest to extract forest resources. Deforestation negatively affects the well-being of vulnerable patients and has repercussions on public health. The decrease in tourist numbers impacts the economy. Individuals setting fire to the forest to gather forest resources impact government and public sector connections. The education sector has implemented many strategies to educate and mitigate forest fires. There is a fire suppression system. Remove garbage, leaves, and branches that are flammable. However, forest fires remain a concern. Collaboration among three entities in the community can aid in preventing unauthorized forest fires through communal procedures. From multiple ministries, the local organization department, and the central government Collaborating to safeguard Forest fire suppression and afforestation This study is a component of the forest fire surveillance division. If the forest fire's location is not clearly indicated, participating in combined operations will lead to issues because of the overlap in operational responsibilities. Previously, thermal imaging satellites were utilized for coordinate determination. If the satellite completes two orbits each day and identifies a hot location, it initiates a forest fire. Firefighters cannot reach the area to put out forest fires;thus, they need to enter from a nearby, accessible location. Joining the forest fire prevention volunteer organization is challenging and will require approximately 24 to 25 hours. This study aims to conserve energy by utilizing an loT system that transmits peer-to-peer signals. Individuals are prepared to dismantle this system. The villagers can develop it themselves due to its modest cost of $10. During a forest fire (temperature exceeding 50 degrees Celsius), specific oper

关键词： Fire extinguishers

来源：评论

学校读者我要写书评

暂无评论

Phase reconstruction challenge for dynamic signal measurement in optical fiber distributed sensors based on Rayleigh backscatter and φ-OTDR

Phase reconstruction challenge for dynamic signal measuremen...

引用

IEEE Photonics Conference (IPC)

作者： Danilo Fernandes Gomes Beatriz Brusamarello Guilherme Heim Weber Daniel Rodrigues Pipa Jean Carlos Cardozo Da Silva Sérgio Taveira De Camargo Manoel Feliciano Da Silva Cicero Martelli Federal University of Technology-Paraná (UTFPR) Curitiba Paraná Brazil Petrobras Research and Development Program Rio de Janeiro Brazil

ISBN: (数字)9798350361957

ISBN: (纸本)9798350361964

Fiber optic sensor systems like DTGS and DAS, utilizing Rayleigh backscattering, effectively monitor temperature and acoustic vibration. In φ - OTDR - based systems, phase demodulation detects thermal and strain changes. Abrupt shifts challenge traditional unwrapping algorithms, leading to errors, highlighting theoretical limits and enhancing optical sensing systems' understanding.

关键词： Temperature sensors Temperature measurement Vibrations Optical fiber sensors Heuristic algorithms Vibration measurement Acoustics Sensor systems Monitoring Backscatter

来源：评论

学校读者我要写书评

暂无评论

Reactive surface intermediates over Ni-grafted TiO2 nanotube arrays towards hydrogen evolution reaction in alkaline and chloride media

引用

International Journal of Hydrogen Energy 2023年第81期48卷 31479-31490页

作者： Cheshideh, Hamed Chen, Hsueh-Yu Liao, Kuo-Wei Wang, Kai-Chin Chen, Guan-Cheng Huang, Hsin-Chih Wang, Chen-Hao Department of Materials Science and Engineering National Taiwan University of Science and Technology Taipei106335 Taiwan Global Development Engineering Program National Taiwan University of Science and Technology Taipei106335 Taiwan Advanced Manufacturing Research Center National Taiwan University of Science and Technology Taipei106335 Taiwan

In this study, the Ni nanoparticles grafted TiO2 nanotubes electrode improved by surface reconstruction (s-Ni/TiO2/Ti) shows the facile hydrogen evolution reaction (HER) in the alkaline and chloride solutions. Nickel nanoparticles were electrochemically grafted on the anodic TiO2 nanotubes under different conditions. The heat treatment of TiO2 nanotubes contributes to the enhancement of electrical conductivity and template adherence. The surface reconstruction is indicated to create heterojunction intermediates, Ni(OH)2 and NiOOH, on the surface of Ni nanoparticles. An extremely low overpotential of 126 mV is required for HER on the s-Ni/TiO2/Ti electrode in 1.0 M KOH solution, showing higher activity than Pt/C. Besides, the developed electrode exhibits an overpotential of 127 mV for HER in 1.0 M KOH + 0.5 M NaCl solution. The long-term stability over 100 h suggests a highly active and inexpensive material choice for substituting the precious electrocatalysts in corrosive media such as seawater. © 2023 Hydrogen Energy Publications LLC

关键词： Titanium dioxide

来源：评论

学校读者我要写书评

暂无评论

Physicochemical properties of lard oil and rubber seed oil blends and their comprehensive characterization

引用

Chinese Journal of Chemical Engineering 2024年第11期75卷 1-13页

作者： Amonrat Thangthong Wuttichai Roschat Phongsakorn Pholsupho Aekkaphon Thammayod Sunti Phewphong Tappagorn Leelatam Preecha Moonsin Boonyawan Yoosuk Pathompong Janetaisong Vinich Promarak Program of Environment Science Faculty of Science and TechnologySakon Nakhon Rajabhat UniversityMueang DistrictSakon Nakhon 47000Thailand Biomass Energy Research Laboratory Center of Excellence on Alternative EnergyResearch and Development InstitutionSakon Nakhon Rajabhat UniversityMueang DistrictSakon Nakhon 47000Thailand Program of Chemistry Faculty of Science and TechnologySakon Nakhon Rajabhat UniversityMueang DistrictSakon Nakhon 47000Thailand Innovation in Chemistry for Community Research Unit Faculty of Science and TechnologySakon Nakhon Rajabhat UniversityMueang DistrictSakon Nakhon 47000Thailand Appropriated Technology Center Faculty of Science and TechnologySakon Nakhon Rajabhat UniversityMueang DistrictSakon Nakhon 47000Thailand Program of Chemistry Faculty of ScienceUbon Ratchathani Rajabhat UniversityMueang DistrictUbon Ratchathani 34000Thailand National Energy Technology Center(ENTEC) 114 Thailand Science ParkPhahonyothin RoadKlong LuangPathumthani 12120Thailand Department of Material Science and Engineering School of Molecular Science&EngineeringVidyasirimedhi Institute of Science and TechnologyWangchanRayong 21210Thailand

This research investigates the potential of blending complementary lard oil with rubber seed oil as feedstock for biodiesel *** seed oil,obtained through hexane extraction using the Soxhlet method,contains the major fatty acids of oleic acid(C_(18:1)),palmitic acid(C_(16:0)),linoleic acid(C_(18:2)),and stearic acid(C_(18:0)),while rubber seed oil primarily consists of linoleic acid(C_(18:2)),oleic acid(C_(18:1)),linolenic acid(C_(18:3)),palmitic acid(C_(16:0)),and stearic acid(C_(18:0)).The least acid value of lard oil(0.55 mg KOH/g)can benefit of reducing soap formation of rubber seed oil during transesterification process in biodiesel production due to its substantial-high acid value(16.28 mg KOH/g).Blending at ratios below 80:20 volume ratio produced biodiesel exceeding 85%,utilizing CaO as a *** oil demonstrated a higher reaction rate constant(11.88×10^(-3)min^(-1))than rubber seed oil(2.11×10^(-3)min^(-1)),indicating a significant difference in *** acid value and free fatty acids in rubber seed oil correlated with lower reaction *** a mixture ratio below 80:20 volume ratio optimized reaction rates during biodiesel *** obtained from blends below 80:20 volume ratio met ASTM D6751 and EN 14214 standards,demonstrating suitability for bio-auto *** drawbacks of using rubber seed oil as a raw material for biodiesel production are overcome by blending with lard oil,giving rise to expanding renewable energy options for rural communities,community enterprises,and large-scale biodiesel production.

关键词： Biodiesel oil Rubber seed oil Lard oil High free fatty acid Physicochemical properties Liquid biofuels

来源：评论

学校读者我要写书评

暂无评论

Accidental Surgical Burns: A QI Project With a New Device

引用

Journal of Radiology Nursing 2024年第4期43卷 257-260页

作者： Pettorini, Kate Kaplow, Roberta Willis, Polly Nursing Perioperative Professional Development Coordinator Emory University Hospital Atlanta GA United States Clinical Nurse Specialist Research and Evidence-Based Practice Emory University Hospital Atlanta GA United States Director Nursing Clinical Excellence and Magnet Program Atlanta GA United States

Background: Surgical fires are events when a fire, flame, or ignition occurs in, on, or near a patient who is undergoing a procedure in an operating room or procedural area and should be considered never events. Burns from surgical fires can result in harm, lasting debility, or death. As surgical fires are considered preventable, implementation of mitigation strategies is essential. Purpose: The purpose of this interdisciplinary quality improvement project was to determine if use of a safety cover made of silicone with a ceramic cap to shield the fiber-optic cable tip would prevent surgical fires during endoscopic procedures. Methods: A Plan-Do-Study-Act method was used during this project. Results: Since this project began, there have been no surgical fires or patient burns attributed to use of fiber-optic light with the GloShield product. Conclusion: The GloShield device decreases the risk of injury from thermal burns. © 2024 Association for Radiologic & Imaging Nursing

关键词： Endoscopic procedures Surgical burns Surgical fires

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：