bluuebunny/crossref_metadata_2025_split huggingface dataset:
Stress Analysis and Backfilling Measures of Gas Pipeline Buried in Embankment of Tunnel
Authors: Wu Jia , Xia Li , Tang Ping 
Published: November 2023

Abstract
Long distance pipelines are usually laid in tunnels to overcome the complexity of geological environment and reduce the construction and maintenance costs. However, pipelines in tunnels may fail for many reasons. Therefore, in order to reduce potential safety hazards and improve the reliability of pipelines, it is necessary to conduct stress analysis on pipelines crossing tunnels. In a project, the gas transmission pipeline in a tunnel is buried in embankment. Considering the surrounding actual conditions, pipeline operation status and other factors, it is necessary to formulate the pipeline backfilling plan and evaluate its stress level. To solve this problem, this paper uses finite element software to establish the pipeline model, and analyzes the stress and displacement under different conditions. The influence of buried depth and overburden compaction multiplier on stress and displacement is also studied. Through the above simulation, the distribution law of stress and displacement is obtained, and the reasonable buried depth and overburden compaction multiplier are found. Then, according to the simulation results, appropriate backfilling measures are taken to ensures the construction of the project and the safe operation of the pipeline.
Seal Failure Analysis of O-Ring Seal Based on Two-Way Fluid-Structure Interaction
Authors: Ma Xinao , Li Qingye , Zong Chaoyong , Zhou Weihao , Song Xueguan 
Published: November 2023

Abstract
O-ring seal is widely used in pressure system to prevent leakage of the fluid medium. However, in actual situations, excessive pressure of the system and the unreasonable structure usually led to the severe distortion of the O-ring seal, which may result in the seal failure and thus medium leakage. To explore the mechanism of these failures, a two-way fluid-structure interaction (FSI) based analysis was carried out in this paper, where the model of O-ring seal is constructed based on the Mooney-Rivlin hyperplastic constitutive model and the dynamic mesh technique. Through simulations, the stress distribution and the deformation of the O-ring seal under 100 MPa pressure conditions were predicted, verifying the ability of the developed numerical model. On this basis, both one-way and two-way FSI simulations were performed, and the pressure ratio of the sealing surface were compared, which indicates that there is obvious difference between these two types of simulations, the pressure ratio produced by the one-way simulations were higher than that obtained from two-way FSI simulations. Since the two-way FSI takes the sealing surface changing into consideration, to ensure the accuracy, it was used in the follow-up analysis works. By observing the simulated strain and stress distribution, it is determined that seal surface near the two right angles of the limiting plate is the key part prone to medium leakage, which provides a basis for the structural optimization design of the O-ring seal.
Research on Optimization of Database Security System of Chemical Industry Park Structures
Authors: Cao Yuxuan , Liu Kejing , Xue Rui , Xu Kaijian , Fang Zhou 
Published: November 2023

Abstract
As an important part of building safety, the safety of chemical industry park structures is of great significance to the improvement and development of the global security system. However, there are still some problems in the design and use of the safety database of chemical structures, such as incomplete information of structures and materials, low integrity of data information, and poor systematic Ness. In this paper, a new database is designed to solve the problems existing in the current chemical industry park structure database. First, establish a new type of database to sort out and store information, including three modules: building information, environment and personnel information, and accident management information. Secondly, through the existing calculation and analysis methods, carry out data analysis for the organic coupling of different modules, and for the possible safety accidents of chemical structures, realize the main functions of optimizing design and construction, assisting daily maintenance, and improving rescue efficiency, Finally, the optimal selection or design measures are provided according to the analysis results, and the final scheme is given according to the specific requirements of the country. In addition, the new database can improve the efficiency of the government’s integrated management of chemical structures and provide data support for improving the building safety system.
Simulation of PA-UT Sector Scanning Imaging of Irregular Defects in Polyethylene Pipe Based on Finite Element Analysis
Authors: Chen Zhuoyu , Feng Ying , Tao Yangji , Wang Zhongzhen , Shi Jianfeng 
Published: November 2023

Abstract
Phased array ultrasonic testing (PA-UT) is a common nondestructive testing technology for polyethylene pipelines. However, the images of PA-UT results may distort due to the acoustic focusing and image construction laws of the inspecting system, especially when performing sector scanning inspection, in which the emitting acoustic waves are more challenging to be converged at the focus points. Therefore, exploring an image reconstructing method is necessary to reduce or eliminate the image distortion of PA-UT results. In practice, more than the number and richness of defect image samples detected by PA-UT is needed to support the research of defect reconstruction. In this paper, based on finite element simulation of the phased array inspecting process, sector scanning simulations of defects of different dimensions and positions were carried out, and the results were obtained based on acoustic focusing and image construction laws. Meanwhile, testing blocks containing the same artificial defects were made and inspected using PA-UT. By comparing the experimental results and finite element simulation, it was found that the simulation models can simulate the distortion features in the results of the sector scanning. Based on the verified model, the imaging features of irregular defects with different dimensions and positions were analyzed, and the regulations of distortion during PA-UT inspecting were preliminarily summarized.
Review on Hydrogen-Induced Failure of Rubber O-Rings for High Pressure Hydrogen Storage Tanks
Authors: Chen Qi , Yang Miaomiao , Peng Wenzhu , Yao Riwu , Shi Jianfeng 
Published: November 2023

Abstract
The hydrogen is prone to leakage, and the explosion risk after hydrogen leakage is high due to the low ignition temperature and large combustion and explosion range (4%–74%). Therefore, the sealing of high pressure hydrogen storage vessels is crucial for the safe use of hydrogen. Rubber O-rings are common sealing element in high pressure hydrogen storage tanks. High pressure hydrogen storage tanks are subjected to severe conditions such as high and low temperature, heat shock, high pressure and pressure cycle, resulting in extrusion fracture, bending fracture, blister fracture and increase of compression set of rubber O-rings during the service. This paper introduces the materials, application and performance requirements of rubber O-rings, and discussed hydrogen-induced damages and failure modes of rubber O-rings. The research progress of hydrogen-induced failure was then reviewed from aspects of experimental studies and finite elements analysis. The functions and experimental parameters of the current experimental devices for hydrogen-induced damage of rubber O-rings were comprehensively introduced, and the difference between the experimental conditions and the actual service conditions were compared and analyzed. It was concluded that the damage evolution mechanism of rubber O-rings under the coupling of temperature, pressure and hydrogen during high pressure hydrogen cycle was not fully understood, especially in the scenario of rapid hydrogen charging and discharging. Finally, it provides research ideas for future work.
Design Data for Alloy 740H High Temperature Concentrating Solar Power Components
Authors: Barua B. , Messner M. C. , Bass R. E. , McMurtrey M. D. 
Published: November 2023

Abstract
Recently, Barua et. al [ANL-20/03, 2020] developed new design rules for high temperature concentrating solar power metallic components. These rules are to be used in conjunction with the Section III, Division 5 rules of the ASME Boiler & Pressure Vessel Code and include three design by analysis options — i) design by elastic analysis with reduced margin, ii) design by elastic analysis with reduced margin and simplified creep-fatigue evaluation, and iii) design by inelastic analysis. In this paper, we report the corresponding design data for a nickelbased high temperature alloy – Alloy 740H. The current Alloy 740H Code Case includes some basic material properties such as Young’s modulus, Poisson’s ratio, thermal properties, yield strength, tensile strength, and allowable stress So. However, a complete design check for high temperature components — i.e., primary load and buckling checks, ratcheting strain limits, and creep-fatigue evaluation — requires additional material data including allowable stress Sm, relaxation strength, isochronous stress-strain curves, minimum-stress-to-rupture Sr, fatigue diagrams, and creep-fatigue damage envelope. We construct these design data from the available material data in the literature and data generated recently at Idaho National Laboratory as part of a U.S. Department of Energy – Solar Energy Technology Office funded project. We also develop an inelastic constitutive model for use with the design by inelastic analysis method.
Numerical Modeling of Strain Rate Effects on the Post Expansion Properties of Expandable Tubular
Authors: Alrasheedi Nashmi , Khan Rashid , Pervez Tasneem , Qamar Syed Zahid , Akhtar Maaz , Arsalan Muhammad 
Published: November 2023

Abstract
The paper presents numerical modeling of tubular expansion for predicting the strain rate effects on post expansion tubular properties. The down-hole expandable tubular has proven itself to be a vital technology in oil well applications. However, there are several challenges faced by researchers and field engineers in implementing and making the technology cost effective while conserving the structural integrity of tubular in post expansion applications. The cold expansion greatly affects the mechanical properties and induces residual stresses in the tubular, which may harm the collapse, burst, and fatigue ratings. Hence, a comprehensive knowledge of tubular’s properties variation is needed in correctly predicting the life span under given operational conditions. Moreover, the expansion rate of full length (3–4 m ∼ 10–13 ft) tubular is also a prime parameter at the field to control the cost of expansion. As required, the rate of expansion must be as high as possible. However, this may greatly affect the material and geometrical properties. Therefore, an exhaustive analysis is required to investigate the effects of strain rate on post expansion tubular properties. In the current work, numerical model is developed of tubular-mandrel system by considering the Johnson-Cook strain rate dependent material model of tubular. The hardening parameters of this are obtained through regression analysis of the uniaxial tensile test data of standard specimen of tubular material. The tension tests are performed at different strain rates vary from 0.05 s−1 to 0.3 s−1. In numerical simulations, the rate of expansion varies by changing the velocity of mandrel from 5 mm/s to 25 mm/s or 5 in/s – 1 in/s. The numerical results are validated and found to be in good agreement with the experimental observations. Finally, further simulations are executed to estimate the variation of contact pressure at tubular-mandrel interface, effective stress, equivalent plastic strain, thickness reduction, and length shortening during expansion process.
Assessment of Fatigue Using Elastic-Plastic Analysis in ASME Section III Appendix XIII: A Proposed Approach and Technical Justification
Authors: Damiani Thomas M. , Matusin Cory S. 
Published: November 2023

Abstract
With ever-increasing computing speed and the enhanced capabilities of commercial finite element analysis software, the use of Elastic-Plastic methods within the ASME Boiler and Pressure Vessel Code has become more widely used for design analysis and fitness-for-service evaluations. The rules in Section III, Appendix XIII, and NB-3200 for pre-2018 versions of the Code, pertaining to the use of “Plastic Analysis” to satisfy the allowable limits for fatigue have been under development in the Section III Working Group on Fatigue Strength. Drawing from methods that are established within ASME Section III Division 5 and Section VIII Division 2, proposed revisions to various sections of Appendix XIII to integrate the use of Plastic Analysis methods into the rules in Section XIII-3440 and -3520 of Appendix XIII are outlined and explained. Additionally, definitions for the calculation of a corollary to the alternating stress amplitude (Salt), referred to as the alternating strain amplitude (εalt), for use in conjunction with the design fatigue curves to calculate a fatigue cumulative usage factor (CUF) are developed. As part of this effort there was an international round robin to evaluate various strain measures and analysis methods, the details of which are documented in a companion paper within this conference. The purpose of this paper is to summarize the proposed changes stemming from the code work and the round robin, and to present the technical justification for use in the balloting process.
Case Study: Transient Thermal Analysis of Valve Flanges
Authors: Seipp Trevor G. , Gu Ming (Forrest) , Brown Robert , Chatham Everett 
Published: November 2023

Abstract
Isolation valves were planned for installation in a vacuum distillation unit heater outlet piping that connects the vacuum transfer line to the vacuum column. These valves had a modified ASME B16.47 Series A, NPS 32, Class 300 flange that mated to a standard ASME B16.47 Series A, NPS 32, Class 300 flange. Previous experience in this service had shown that the thermal transients experienced during start-up and shutdown could cause leakage of the flanges.
While there are a number of different parameters that can impact the performance of a bolted flange joint during transient thermal conditions, such as gasket type, gasket width, gasket OD, gasket thickness, and assembly bolt loads, this paper exclusively examines the effects of the assembly bolt loads. Thermal finite element analyses were performed to simulate the thermal transient events. Sequentially-coupled mechanical analyses were performed examining the above-noted parameters. The analyses were performed using a 2D-axisymmetric approach, and validated by a 3D-solid model. The leak-tightness of the various configurations were assessed by calculating the compressive stresses in the gasket across the full gasket width and comparing to an optimal gasket operating stress. The sealing face flatness was assessed after several simulated cycles to determine if any permanent deformation occurs in the flange face.
Three flange configurations were evaluated in this case study: the downstream flange pair, the upstream flange pair, including a spacer ring/spectacle blind, and a regular weld neck-to-weld neck flange.
This paper presents the results of the case study and demonstrates several techniques for evaluating bolted flange joints and their critical parameters.
Manipulating the growth environment through co-culture to enhance stress tolerance and viability of probiotic strains in the gastrointestinal tract
Authors: Oana Kosuke , Shimizu Kensuke , Takada Toshihiko , Makino Hiroshi , Yamazaki Mikiko , Katto Miyuki , Ando Minoru , Kurakawa Takashi , Oishi Kenji 
Published: November 2023

ABSTRACT

The viability of probiotics in the gastrointestinal tract is essential because it has an important role in their health benefits. Plasticity is a phenomenon associated with stress tolerance in bacteria, and stress tolerance of probiotic strains can be induced by the use of additives and weak stress. However, some of these processes are difficult to implement in the manufacture of probiotic beverages, and there are few methods that can be easily applied. Co-culture techniques have been used to produce fermented beverages and may impart distinct characteristics through differences in the culture environment compared with those of monoculture. Here, we show that the stress tolerance of a probiotic strain was altered by co-culture with other strains already used in product manufacturing. Stress tolerance in
Lacticaseibacillus paracasei
strain Shirota was enhanced by co-culture with
Lactococcus lactis
subsp.
lactis
YIT 2027 as a result of an earlier pH decrease. Therefore, the stress tolerance was similarly improved in monocultures where pH was manipulated. Strains with improved stress tolerance had an increase in dihydrosterculic acid in the cell membrane, with altered gene transcription in energy metabolism, lipid metabolism, and chaperone genes. Moreover, fermented beverage consumption studies revealed that the probiotics produced through co-culture were significantly more viable in the human gastrointestinal tract than those produced through monoculture. These data suggested that co-culture with specific strains can significantly enhance the viability of probiotic strains in the human gastrointestinal tract.

IMPORTANCE
The viability of probiotics in the human gastrointestinal tract is important, as some reports indicate that the health benefits of live bacteria are greater than those of dead ones. Therefore, the higher the viability of the probiotic strain, the better it may be. However, probiotic strains lose their viability due to gastrointestinal stress such as gastric acid and bile. This study provides an example of the use of co-culture or pH-controlled monoculture, which uses more stringent conditions (lower pH) than normal monoculture to produce probiotic strains that are more resistant to gastrointestinal stress. In addition, co-cultured beverages showed higher viability of the probiotic strain in the human gastrointestinal tract than monocultured beverages in our human study.
Circular genomes of two bacterial strains capable of growing in a CO
2
-containing atmosphere
Authors: Heidler von Heilborn David , Bartholomäus Alexander , Lipski André 
Published: November 2023

ABSTRACT

The bacterial strains
Brochothrix thermosphacta
DH-B18 and
Rathayibacter
sp. DH-RSZ4 were isolated from raw sausage and escalope samples and grown in a CO
2
-rich modified atmosphere. Here, we present both circular genomes obtained by nanopore sequencing.
A transcriptomic atlas of acute stress response to low pH in multiple
Issatchenkia orientalis
strains
Authors: Dubinkina Veronika , Bhogale Shounak , Hsieh Ping-Hung , Dibaeinia Payam , Nambiar Ananthan , Maslov Sergei , Yoshikuni Yasuo , Sinha Saurabh 
Published: November 2023

ABSTRACT

Because of its natural stress tolerance to low pH,
Issatchenkia orientalis (a.k.a. Pichia kudriavzevii)
is a promising non-model yeast for bio-based production of organic acids. Yet, this organism is relatively unstudied, and specific mechanisms of its tolerance to low pH are poorly understood, limiting commercial use. In this study, we selected 12
I. orientalis
strains with varying acid stress tolerance (six tolerant and six susceptible) and profiled their transcriptomes in different pH conditions to study potential mechanisms of pH tolerance in this species. We identified hundreds of genes whose expression response is shared by tolerant strains but not by susceptible strains, or vice versa, as well as genes whose responses are reversed between tolerant and susceptible strains. We mapped regulatory mechanisms of transcriptomic responses via motif analysis as well as differential network reconstruction, identifying several transcription factors, including Stb5, Mac1, and Rtg1/Rtg3, some of which are known for their roles in acid response in
Saccharomyces cerevisiae
. Functional genomics analysis of short-listed genes and transcription factors suggested significant roles for energy metabolism and translation-related processes, as well as the cell wall integrity pathway and RTG-dependent retrograde signaling pathway. Finally, we conducted additional experiments for two organic acids, 3-hydroxypropionate and citramalate, to eliminate acid-specific effects and found potential roles for glycolysis and trehalose biosynthesis specifically for response to low pH. In summary, our approach of comparative transcriptomics and phenotypic contrasting, along with a multi-pronged bioinformatics analysis, suggests specific mechanisms of tolerance to low pH in
I. orientalis
that merit further validation through experimental perturbation and engineering.

IMPORTANCE

Issatchenkia orientalis
is a promising industrial chassis to produce biofuels and bioproducts due to its high tolerance to multiple environmental stresses such as low pH, heat, and other chemicals otherwise toxic for the most widely used microbes. Yet, little is known about specific mechanisms of such tolerance in this organism, hindering our ability to engineer this species to produce valuable biochemicals. Here, we report a comprehensive study of the mechanisms of acidic tolerance in this species via transcriptome profiling across variable pH for 12 different strains with different phenotypes. We found multiple regulatory mechanisms involved in tolerance to low pH in different strains of
I. orientalis
, marking potential targets for future gene editing and perturbation experiments.