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    Calculation Model for Adhesion Resistance in Differential Pressure Sticking of Downhole String by Zhou Yuting, Zhang Hui, Yang Boyuan, Wang Peng, Yu Qing, Liu Kerou, Lü Kunhong

    Published 2025-06-01
    “…Differential pressure sticking is one of the main causes for significantly increased non-production time and cost.The existing research on differential pressure sticking often relies on empirical summaries of field da-ta or laboratory tests,while the current theoretical model research also fails to consider the stress on pipe string,wellbore condition and mud cake strength.In this paper,considering the length,force and area of contact between the pipe string and the wellbore wall,a calculation model for the adhesion resistance in differential pressure stick-ing of downhole string was built.Then,the model was used for sensitivity analysis on the axial force of the string,the wellbore parameters(well diameter,hole angle,dogleg) and the mud cake parameters(mud cake thickness,elastic modulus,Poisson’s ratio,permeability),to understand how these factors affect the adhesion resistance.Finally,the model was verified through example application.The results show that for the axial force of the string,the adhesion resistance decreases with the increase of tension and increases with the increase of pressure.For the main wellbore parameters,the adhesion resistance decreases with the increase of well diameter and increases with the increase of hole angle and dogleg.For the main mud cake parameters,the adhesion resistance decreases with the increase of the elastic modulus of the mud cake,slightly decreases with the increase of the Poisson’s ratio of the mud cake,and first increases and then tends to be smooth with the increase of the mud cake permeability; and the maximum adhesion resistance increases with the increase of the mud cake thickness.The research results provide a theoretical basis for the further research on differential pressure sticking and a theoretical guidance for the field pre-vention of sticking accidents.…”
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  3. 503

    Study on the Effect of Different Cathodic Protection Potentials on the Growth of Mixed Bacteria and Cathodic Protection Efficiency by Zeyu Zuo, Jie Zhang, Qingle Hou, Chengjun Zhang, Ke Wang, Jizhou Duan, Xilei Chen, Baorong Hou

    Published 2025-04-01
    “…The results indicate that in a marine environment containing IOB and SRB, the cathodic protection efficiency of the ICCP system increases with the negative shift of the protection potential. …”
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  4. 504

    Impact of Laser Ablation Strategies on Electrochemical Performances of 3D Batteries Containing Aqueous Acid Processed Li(Ni<sub>0.6</sub>Mn<sub>0.2</sub>Co<sub>0.2</sub>)O<sub>2</s... by Penghui Zhu, Yannic Sterzl, Wilhelm Pfleging

    Published 2024-10-01
    “…Rate capability analyses of cells with laser structured aqueous processed electrodes exhibited enhanced performance with capacity increases of up to 60 mAh/g at high current density, while a 65% decrease in ionic resistance was observed for cells with laser structured electrodes. …”
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  5. 505

    Performance Evaluation of Low-Cost Infrared Thermal Imagers for Quantitative Surface Temperature Measurement in Building Enclosures by ZHANG Wenhao, SUN Zhen, GAO Siru, WANG Xue, LI Honglian, Yang Liu

    Published 2024-01-01
    “…The research demonstrates that low-cost infrared thermal imagers, when properly calibrated, can be used for non-contact quantitative surface temperature measurement in building environments. …”
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  6. 506

    EXPLOITATIVE DESTRUCTION FEATURES FOR DETONATION ULTRADISPERSED DIAMONDS OF INITIAL METALLIC PROTECTION FOR ABRASIVE POWDER GRAINS TO DIAMOND-SPARK GRINDING TOOLS by Yury GUTSALENKO, Cătălin IANCU, Sergey BRATAN

    Published 2015-05-01
    “…One problem is that the presence of detonation ultra-dispersed diamonds in the grain metal coating of diamond powders not only improves the coating functional reliability in protection from destruction in the subsequent pressing and sintering in the production tool, but also resistance of such coating to the opening of the diamond cutting basis of the grains on the grinding wheel working surface that come into working contact with the material being processed. An analysis of the features of an effective exploitative destruction of detonation ultra-dispersed diamonds in the metal coating using electric current in the tool of the diamondspark grinding processes is presented.…”
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    DIGITAL FILTERS IMPLEMENTATION IN MICROPROCESSOR-BASED RELAY PROTECTION by Yu. V. Rumiantsev, F. A. Romaniuk, V. Yu. Rumiantsev, I. V. Novash

    Published 2016-09-01
    “…This results in distortion of the current transformer secondary current which in this case contains higher and inter-harmonics. …”
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    Karakteristik Istri Nelayan Dalam Upaya Meningkatkan Pendapatan Keluarga Pesisir Pantura Di Desa King-King Kecamatan Tuban Kabupaten Tuban <br><i>[Characteristics of Fishermen’s... by Siti Alfaniatur Rokhmah, Yuyun Suprapti, Miftachul Munir, Miftachul Munir

    Published 2019-05-01
    “…Sequentially the contribution of fishermen’s wives in King-king Village is to trade (57%), employee labor (13%), entrepreneurs (7%), housemaids (10%), and odd jobs (13%). Increasing the wife’s role in work is one of the current strategic efforts to increase household income and help meet family needs.…”
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    Impacts of MDR/XDR-TB on the global tuberculosis epidemic: Challenges and opportunities by Kai Ling Chin, Luis Anibarro, Zi Yuan Chang, Praneetha Palasuberniam, Zainal Arifin Mustapha, Maria E. Sarmiento, Armando Acosta

    Published 2024-01-01
    “…Moreover, inconsistent drug therapy or unsuitable drug regimens could also lead to the subsequent development of drug resistance. The close contacts of an index MDR/XDR-TB patient are at increased risk of developing MDR/XDR-TB. …”
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