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Experimental and analytical investigation on friction resistance force between buried coated pressurized steel pipes and soil

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Frontiers of structural and Civil Engineering 2024年第4期18卷 615-629页

作者： shaurav ALAM Tanvir MANZUR John MATTHEWs chris BARTLETT Erez ALLOUCHE Brent KEIL John KRAFT Department of Civil Engineering and Construction Engineering Technology Louisiana Tech UniversityRustonLA 71270USA Department of Civil Engineering Bangladesh University of Engineering and TechnologyDhaka 1000Bangladesh Georgia Tech Research Institute AtlantaGA 30332USA stantec Inc. Edmonton T5J0K4Canada North West Pipe Company VancouverWA 98684USA

This paper presents an analytical approach for estimating frictional resistance to pipe movement at soil and external pipe surface of buried coated pressurized steel pipes relative to the internal thrust *** proposed analytical method was developed based on 36 experiments,which involved three coating types(cement mortar(CM),polyurethane type-I(PT-I),prefabricated plastic tape(PPT))on pipes’surfaces,three different soils(pea-gravel(PG),sand(s),silty-clay(sC)),and four simulated over burden depths above the pipe’s *** showed frictional resistance decreased with increasing over burden depth above the pipe’s *** degree of frictional resistance at the pipe-soil interface was found to be in the order of PG>sC>s for all coating variations and overburden *** coated pipe buried in all three types of soil produced significantly higher frictional resistance as compared to other coating *** on experimental data,the developed analytical introduced a dimensionless factor“Z”,which included effects of types of coatings,soil,and overburden depths for simplified rapid *** showed that the method provided a better prediction of frictional resistance forces,in comparison to previous analytical methods,which were barely close in predicting friction resistance for different coating variations,soil types,and overburden *** resistance force values reported herein could be considered conservative.

关键词： friction resistance force thrust force coated pressurized steel pipe soil type overburden depth

Innovations Not Enough—Yet—to Make Headset Market an Actual Reality

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Engineering 2024年第10期41卷 4-6页

作者： chris Palmer senior Technology Writer

In January 2024,after decades of intermittent improvements in virtual reality(VR)and augmented reality(AR)devices failing to help the technology catch on with the public,tech behemoth Apple(Cupertino,CA,UsA)launched its marketing of a headset with by far the highest resolution and sharpest contrast of any commercially available device to date[1].Yet sales of the Vision Pro(Fig.1),Apple’s much anticipated first entry in the VR/AR marketplace,have fallen far short of the company’s already low expectations[2].

关键词： Market Apple sharp

Predictive modeling for post operative delirium in elderly

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World Journal of Gastrointestinal Oncology 2024年第9期16卷 3761-3764页

作者： chris B Lamprecht Abeer Dagra Brandon Lucke-Wold Lillian s.Wells Department of Neurosurgery University of FloridaGainevilleFL 32610United States

Delirium,a complex neurocognitive syndrome,frequently emerges following surgery,presenting diverse manifestations and considerable obstacles,especially among the *** editorial delves into the intricate phenomenon of postoperative delirium(POD),shedding light on a study that explores POD in elderly individuals undergoing abdominal malignancy *** study examines pathophysiology and predictive determinants,offering valuable insights into this challenging clinical *** the synthetic minority oversampling technique,a predictive model is developed,incorporating critical risk factors such as comorbidity index,anesthesia grade,and surgical *** is an urgent need for accurate risk factor identification to mitigate POD *** specific to elderly patients with abdominal malignancies,the findings contribute significantly to understanding delirium pathophysiology and *** research is warranted to establish standardized predictive for enhanced generalizability.

关键词： Post-operative delirium Elderly delirium Neurocognitive syndrome Neurotransmitters Abdominal malignancy Predictive model synthetic minority oversampling technique

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NAsA激光通信系统创传输速度新纪录

Engineering 2024年第3期34卷 9-11页

作者： chris Palmer senior Technology Writer

In April 2023,a satellite orbiting approximately 500 km above Earth’s surface delivered terabytes of data at record-breaking rates of up to 200 Gb·s^(-1)—more than 100 times faster than the fastest internet speeds in most cities—via an optical communication link to a ground-based receiver 95 km north of Los Angeles,CA,UsA[1].At more than 1000 times faster than the radiofrequency(RF)links traditionally used for satellite communication,this is the highest data rate ever achieved for a space-to-ground optical transmission[1].

关键词：激光通信系统 communication optical

“泰坦”号潜水器--通向死亡的“海洋之门”

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Engineering 2024年第1期32卷 1-3页

作者： chris Palmer senior Technology Writer

Early on the morning of June 18,2023,far off the shore of Newfoundland,Canada,the Titan deep-sea submersible began its descent into the depths of the North *** was Titan’s inventor and pilot,stockton Rush,along with four“mission specialists,”several of whom may have paid as much as 250000 UsD to accompany Rush on a voyage to the site of the infamous Titanic shipwreck on the ocean *** two hours later.

关键词：泰坦 depths ocean

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浮式海上风电助力可再生能源发展

Engineering 2024年第4期35卷 1-3页

作者： chris Palmer senior Technology Writer

Nearly 150 km off the coast of Norway,in one of the windiest places on Earth,stands Hywind Tampen,the world’s largest floating wind power *** weighing 8800 t and 190 m tall,with roughly one-third of that height sitting below the waterline,Hywind Tampen’s 11 turbines can generate 94.6 MW(Fig.1)[1].The blades—each 80 m long—travel at a blistering 290 km∙h–1,yet because of their size they complete only about 10 to 15 full rotations per minute.A single rotation provides enough electricity to power an average home for a ***,Hywind Tampen,which became fully operational in August 2023,will not power ***,the installation built by energy company Equinor(stavanger,Norway)will provide 38%of the annual electricity consumed by five nearby offshore oil platforms in the North sea[1].

关键词： rotation travel floating

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对臭氧层造成破坏的违禁化学物质仍在增加

Engineering 2024年第4期35卷 7-9页

作者： chris Palmer senior Technology Writer

As reported in a study published in April 2023,some of the globally banned chemicals that decimated the Earth’s ozone layer are still finding their way into the atmosphere[1].While unlikely to greatly impact global ozone levels,the continuing pollution has scientists concerned for two reasons:The chemicals,called chlorofluorocarbons(CFCs),are potent greenhouse gases,and,perhaps more worrying,the sources of the surprising emissions remain unidentified.

关键词： pollution ozone globally

European Union Issues World’s First Comprehensive Regulations for Artificial Intelligence

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Engineering 2024年第7期38卷 5-7页

作者： chris Palmer senior Technology Writer

In March 2024,European Union(EU)lawmakers passed the world’s first comprehensive set of regulations governing the use of artificial intelligence(AI)[1].The EU’s AI Act,two and a half years in the making,was initially drawn up as a landmark bill to reduce harm in areas in which AI was thought to pose the biggest risks to people,such as in health care,education,and security,as well as banning uses that pose“unacceptable risks,”including manipulation of human behavior and evaluation of individuals’trustworthiness based on personal *** to the regulations,which will go into effect in stages over the next two years,“high-risk”AI systems will require risk-mitigation strategies,high-quality data sets,transparency,better documentation,and human *** most common current AI uses,such as augmenting recommendation engines and email spam filters,will see far less oversight.

关键词： email artificial transparency

An alfalfa MYB-like transcriptional factor MsMYBH positively regulates alfalfa seedling drought resistance and undergoes MsWAV3-mediated degradation

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Journal of Integrative Plant Biology 2024年第4期66卷 683-699页

作者： Kun shi Jia Liu Huan Liang Hongbin Dong Jinli Zhang Yuanhong Wei Le Zhou shaopeng Wang Jiahao Zhu Mingshu Cao chris s.Jones Dongmei Ma Zan Wang College of Grassland science and Technology China Agricultural UniversityBeijing 100193China Institute of Animal sciences Chinese Academy of Agricultural SciencesBeijing 100193China AgResearch Grasslands Research Centre Palmerston North 4442New Zealand International Livestock Research Institute Nairobi 00100Kenya school of Ecology and Environment Ningxia UniversityYinchuan 750021China

Drought is a major threat to alfalfa(Medicago sativa L.)*** discovery of important alfalfa genes regulating drought response will facilitate breeding for drought-resistant alfalfa ***,we report a genome-wide association study of drought resistance in *** identified and functionally characterized an MYB-like transcription factor gene(MsMYBH),which increases the drought resistance in *** with the wild-types,the biomass and forage quality were enhanced in MsMYBH overexpressed *** RNA-seq,proteomics and chromatin immunoprecipitation analysis showed that MsMYBH can directly bind to the promoters of MsMCP1,MsMCP2,MsPRX1A and MsCARCAB to improve their *** outcomes of such interactions include better water balance,high photosynthetic efficiency and scavenge excess H_(2)O_(2)in response to ***,an E3 ubiquitin ligase(MsWAV3)was found to induce MsMYBH degradation under long-term drought,via the 26s proteasome ***,variable-number tandem repeats in MsMYBH promoter were characterized among a collection of germplasms,and the variation is associated with promoter ***,our findings shed light on the functions of MsMYBH and provide a pivotal gene that could be leveraged for breeding drought-resistant *** discovery also offers new insights into the mechanisms of drought resistance in alfalfa.

关键词： alfalfa drought resistance E3 ubiquitin ligase MsMYBH MsWAV3 MYB-like transcriptional factor