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Condition indices for rigid pavements: A comparative analysis of state DOTs using michigan PMS data

Journal of Road Engineering 2024年第3期4卷 348-360页

作者： Rahul Raj Singh Mumtahin Hasnat Muhammed Emin Kutay Syed Waqar Haider James Bryce Bora Cetin Department of Civil and Environmental Engineering Michigan State UniversityEast LansingMI 48824USA Wadsworth Department of Civil and Environmental Engineering West Virginia UniversityMorgantownWV 26506USA

Pavement infrastructure is vital in providing services and links between various sectors of society. Therefore, thepreservation and maintenance of these roads are critical to attaining a pavement network in good conditionthroughout its service life. Various performance indicators like the international roughness index (IRI), pavementcondition index (PCI), and present serviceability rating (PSR) have been used by the state department of transportation (DOT) and highway agencies for evaluating pavement surface conditions and planning future maintenance strategies. Limited data availability, multiple distresses depending on region, lack of correlation of thesecondition indices to maintenance strategies, and data collection limitations pose a challenge for applying theseindices to local conditions. This paper compares condition indices of different states for rigid pavements. Further,using a specific condition index for local conditions is also highlighted. For this purpose, five states and theircorresponding condition indices were evaluated and compared to the michigan DOT distress index (DI). Thesestates include Virginia, Minnesota, North Dakota, Louisiana, and Oregon. The corresponding distresses of eachcondition index were converted to make them compatible with the MDOT DI. This study used the MDOT'spavement management system (PMS) database to evaluate each condition index for 433 rigid pavement *** distress index was plotted against MDOT DI and compared using a paired t-test. Results show that thecondition indices of Virginia and Minnesota are comparable to DI in terms of the Spearman correlation value. Thet-test results show that except for Virgina, condition indices from other states statistically differ from ***, one can't use those directly for local conditions in michigan. This paper presents the evaluation anddata requirements for each condition index and its impact on selecting a maintenance treatment.

关键词： Rigid pavement Pavement management Condition index Distress index

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Mechanical properties of michigan Basin’s gypsum before and after saturation

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Journal of Rock Mechanics and Geotechnical Engineering 2019年第4期11卷 739-748页

作者： Mohammadhossein Sadeghiamirshahidi Stanley J.Vitton Department of Civil and Environmental Engineering Michigan Technological University

The stability analysis of an abandoned underground gypsum mine requires the determination of the mine pillar’s *** is especially important for flooded abandoned mines where the gypsum pillars become saturated and are subjected to dissolution after ***,mine pillars are subjected to blast vibrations that generate some level of macro- and *** samples of gypsum must,therefore,simulate these conditions as close as *** this research,the strength of gypsum is investigated in an as-received saturated condition using uniaxial compressive strength (UCS),Brazilian tensile strength (BTS) and point load index (PLI) *** scale effect was investigated and new correlations were derived to describe the effect of sample size on both UCS and BTS under dry and saturated *** of blasting on these parameters were observed and the importance of choosing the proper samples was ***,correlations were derived for both compressive and tensile strengths under dry and saturated conditions from the PLI test results,which are commonly used as a simple substitute for the indirect determination of UCS and BTS.

关键词： Uniaxial compressive strength (UCS) Brazilian tensile strength (BTS) Point load index (PLI) Scale effect michigan Basin's gypsum

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C-reactive protein and telomerase reverse transcriptase(TERT)associate with chronic disease markers in a sample from low-income neighborhoods in Detroit,michigan

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Sports Medicine and Health Science 2022年第4期4卷 275-279页

作者： David P.Ferguson Eric C.Leszczynski Teresa H.Horton Karin A.Pfeiffer Joseph Gardiner Amber L.Pearson Department of Kinesiology Michigan State UniversityUnited States Department of Anthropology Northwestern UniversityUnited States Department of Epidemiology and Biostatistics Michigan State UniversityUnited States Department of Geography Environment and Spatial SciencesMichigan State UniversityUnited States

Racial and ethnic minorities in economically deprived inner cities experience high rates of chronic diseases compared to neighborhoods with higher socioeconomic status(SES).However,these economically deprived populations are understudied in terms of biomarkers associated with chronic disease risk which include C-reactive protein(CRP),telomerase reverse transcriptase(TERT),and glycosylated hemoglobin(A1C).We examined relationships between CRP and TERT and chronic disease indicators(body mass index[BMI]and A1C)in two lowincome,predominantly African American(AA)neighborhoods in Detroit,***-nine adults(43 females,26 males,mean age 46 years[y],standard deviation[SD]=15.9)completed a health survey,anthropometry,and finger stick blood tests.A1C was measured using A1CNow test strips,and CRP and TERT levels were measured using enzyme-linked immunosorbent assay(ELISA)with samples extracted from dried blood *** examined CRP(mean=4.9,SD=3.1),TERT(mean=32.5,SD=15.1),and A1C(mean=5.4,SD=1.0)by BMI *** fitted restricted maximum likelihood regression models to evaluate associations between CRP,TERT,BMI,and A1C,after adjustment for demographics and inclusion of a random effect for the *** this predominantly AA sample(91%,63/69),68%had levels of CRP(means=4.8 mg/L,SD=3.0 for AAs;6.4 mg/L,SD=3.9 for all others)indicative of chronic inflammation(CRP greater than 3 mg/L).BMI was significantly associated with CRP(p=0.004)and TERT(p=0.026).TERT levels indicate that being overweight is associated with markers of chromosome remodeling,suggestive of chronic *** followed a similar trend with overweight individuals having higher inflammation and risk of chronic *** findings warrant further exploration of additional factors that may influence CRP and ***,examining populations in a more ethnically and/or economically diverse,yet still high proportion minority,sample will fill a knowledge gap in this understudied field.

关键词： Ethnic minority Inequality Chronic disease Urban Biomarkers

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A review on the best practices in concrete pavement design and materials in wet-freeze climates similar to michigan

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Journal of Traffic and Transportation Engineering(English Edition) 2019年第3期6卷 245-255页

作者： Naser P. Sharifi Siyu Chen Zhanping You Thomas Van Dam Christopher Gilbertson Department of Civil and Environmental Engineering Michigan Technological University Houghton MI 49931 USA Nichols Consulting Engineers Chtd. Reno NV 89509 USA

The research presented in this paper aims to identify best practices of design and materials for concrete pavements in wet-freeze climates similar to the michigan State. For the purposes of this paper, a best practice is a procedure that has been shown by field-validated research or experience to produce improved results and that is established or proposed as a standard suitable for widespread implementation. The local wet-freeze climate makes the requirements for michigan's pavement system different from many other regions. Wetfreeze climates can result in various concrete pavement distress mechanisms such as thermally-induced cracking, freeze-thaw deterioration, accelerated cracking due to loss of support, frost heave, and material degradation. Therefore, appropriate procedures for design and material selection need to be selected to withstand high precipitation and freezing winter temperatures. Failure to take into account the climatic conditions may lead to inadequate or reduced pavement performance. However, utilizing appropriate techniques and materials could potentially improve the quality and increase the service life of the concrete pavement. Three design methods and five materials have been identified, and examples of their successful performance in wet-freeze climates are provided. In addition, the reasons that give them the superior performance in wet-freeze climates are discussed in detail.

关键词： Concrete pavements Pavement design Pavement materials Best practice Wet-freeze climate

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Microstructure Characterization of a Biogenic Shale Gas Formation——Insights from the Antrim Shale,michigan Basin

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Journal of Earth Science 2020年第6期31卷 1229-1240页

作者： Kouqi Liu Natalia Zakharova Thomas Gentzis Adedoyin Adeyilola Humberto Carvajal-Ortiz Hallie Fowler Department of Earth and Atmospheric Sciences Central Michigan UniversityMount PleasantMI 48859USA Core Laboratories Reservoir Geology GroupHoustonTX 77040USA

Biogenic gas shales,predominantly microbial in origin,form an important class of organicrich shale reservoirs with a significant economic *** large gaps remain in the understanding of their gas generation,storage,and transport mechanisms,as previous studies have been largely focused on mature thermogenic shale *** this study,the pore structure of 18 Antrim Shale samples was characterized using gas adsorption(CO2 and N2).The results show that most of the Antrim Shale samples are rich in organic matter content(0.58 wt.%to 14.15 wt.%),with highest values found in the Lachine and Norwood *** from the Paxton Member,characterized by lower organic content,have smaller micropore surface area and micropore volume but larger meso-macro pore surface area and *** deconvolution results of the pore size distribution from the N2 adsorption indicate that all of the tested Antrim Shale samples have similar pore *** matter in the Antrim Shale hosts micro pores instead of meso-macro pores,while clay minerals host both micro and meso-macro *** pores play a primary role in the total *** biogenic Antrim Shale,therefore,has different pore structures from other well-studied thermogenic gas shales worldwide.

关键词： gas adsorption Antrim Shale biogenic shale organic matter

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Peer Influence of Non-Industrial Private Forest Owners in the Western Upper Peninsula of michigan

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Open Journal of Forestry 2012年第3期2卷 150-158页

作者： Jillian R. Schubert Audrey L. Mayer Department of Social Sciences Michigan Technological University Houghton USA

Understanding how non-industrial private forest (NIPF) owners gain and share information regarding the management of their property is very important to policy makers, yet our knowledge regarding how and to what degree this information flows over privately owned landscapes is limited. The work described here seeks to address this shortfall. Widely administered surveys with close-ended questions may not adequately capture this information flow within NIPF owner communities. This study used open-ended questions in interviews of clusters of NIPF owners to determine whether and to what extent owners in-fluence each other directly (through conversations or referrals to sources of advice) or indirectly (through observation of management). We obtained data from thirty-four telephone interviews with owners of NIPF properties in the Western Upper Peninsula of michigan, and analyzed the data using open coding. Roughly half of the forest owners we interviewed were influenced either directly or indirectly by other members of their NIPF communities. Reasons for owning forests (such as privacy, hunting and nature recreation, and economics) also influenced owners’ management behaviors and goals. This peer-to-peer flow of information (whether direct or indirect) has significant implications for how to distribute management and programmatic information throughout NIPF owner communities, and how amenable these communities may be to cooperative or cross-boundary programs to achieve ecosystem and landscapescale goals.

关键词： Communication Information Management Landowners Opinion Leader Policy

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Informationist roles and collaborations in curriculum innovation at the University of michigan＇s *** Taubman Health Sciences Library

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中华医学图书情报杂志 2018年第1期27卷 45-49页

作者： Whitney A.Townsend Uniesity of michigan's A. Alfred Taubman Health Sciences Library

To address the ultimate mission to be ＂ a valued partner,fully integrated into the work of the university and providing leadership in knowledge management for education, research, patient care, and community outreach＂,the University of michigan A. Alfred Taubman Health Sciences Library(THL） has transformed from retitling librarians as informationists to shifting from a service to a collaboration focus. Infomationists at THL have spent several years building relationships and expertise to be true partners in curriculum integration and innovation within the health sciences schools and colleges at the University of michigan and the curricular integration has becoming a constantly evolving process for THL informationists. Current article focus on how THL convert the librarian into informationist and how to make collaborations in curriculum innovation within different departments to furtherly improve the status of THL library in the University.

关键词： Mission Integrated Informationist Collaboration focus Curriculum innovation

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The Relationship of the Sapstreak Fungus, <i>Ceratocystis virescens</i>, to Sugar Maple Dieback and Decay in Northern michigan

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American Journal of Plant Sciences 2013年第2期4卷 436-443页

作者： Tara L. Bal Dana L. Richter Andrew J. Storer Martin F. Jurgensen School of Forest Resources and Environmental Science Michigan Technological University Houghton USA

Unusually high levels of dieback have recently been reported in sugar maple, Acer saccharum Marsh., in Upper michigan, and a network of plots was established to determine the extent and factors associated with the dieback. A possible contributor to this dieback is sapstreak disease caused by Ceratocystis virescens (Davidson) Moreau. Unhealthy trees with considerable crown dieback were evaluated across the western Upper Peninsula, MI to determine the prevalence of the sapstreak fungus using a minimally destructive sampling technique. Approximately 8% of 90 trees sampled were sapstreak positive and approximately 10% of trees were positive at one site that had recently been harvested. While the high levels of maple dieback present in these forests appear not to be directly caused by widespread sapstreak disease, the occurrence of sapstreak may be significantly impacting trees at some locations. However, even when present on a low number of trees, the biointeraction of sapstreak and decay rates from other fungi could be important for future tree mortality and value to the forest industry. Therefore, the effect of two sapstreak fungal isolates on the amount of decay caused by two common maple white rot fungi, Trametes versicolor (L.:Fr.) Pilat. And Irpex lacteus (Fr.:Fr.) Fr. was tested in the laboratory. Sugar maple wood blocks were precolonized by two native isolates of C. virescens followed by inoculation and incubation with decay fungi. Mean percent weight loss of blocks by white rot decay fungi ranged from 39% to 55%, but decay rates were not significantly affected by the presence of the sapstreak fungus.

关键词： Sapstreak Disease Acer sacharrum Decay Rates Crown Dieback

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Analysis of Historic Pavement and Bridge Conditions and Alternative Funding Levels for the michigan Department of Transportation

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Journal of Traffic and Transportation Engineering 2015年第2期3卷 91-102页

作者： William Robert Kirk Steudle Polly Kent Spy Pond Partners LLC Arlington 02476 USA michigan Department of Transportation Lansing 48933 USA

In 1997, MDOT （michigan Department of Transportation） established an ambitious set of condition targets for its pavements and bridges and the department received increased revenue from a 4-cent-per-gallon increase in the state motor fuels tax to help meet its targets. However, over time, actual revenue was less than what was initially estimated as needed and actual conditions fell short of the target levels. In 2013, MDOT performed an analysis of historic conditions to determine what additional fuel tax revenues would have been required beginning in 1997 to replace bond revenues used to fund pavement and bridge projects from 1997 to 2012 and enable MDOT to meet its condition targets. The analysis concluded that, in addition to the actual increase of 4 cents per gallon, a fuel tax increase of another 10 cents per gallon would have been required in 1997 to replace bond revenue used for pavement and bridges and allow MDOT to meet its condition targets. The analysis results were used to help inform the discussion of michigan＇s targets asset conditions and funding and demonstrate application of MDOT＇s pavement and bridge management systems for performing historic analyses.

关键词： Transportation asset management transportation finance performance measures pavement management bridgemanagement.

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Distribution of Sediment Measurements in Lake michigan as a Case Study: Implications for Estimating Sediment and Water Interactions in Eutrophication and Bioaccumulation Models

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Applied Mathematics 2016年第15期7卷 1846-1867页

作者： David H. Miller Xiangsheng Xia Wei-Chuang Huang Ronald Rossmann U.S. EPA ORD NHEERL Mid-Continent Ecology Division Large Lakes Research Station Grosse Ile Michigan USA CSC Corporation Grosse Ile Michigan USA U.S. Navy Research Laboratory Geothermal Program Office China Lake California USA

Lake michigan, the sixth largest freshwater lake in the world by surface area, was utilized as a water body for assessment. Field data collected at sampling sites throughout the lake in an intensive monitoring effort were utilized for evaluation of the distribution of sediment measurements. An assessment of sediment nutrient and carbon measurements within Lake michigan was completed to recognize strata resulting from the hydrodynamics of the system. Nonparametric comparison tests revealed that significant differences exist between measurements of sediment nutrients and organic carbon in the lake using strata based upon water column depth (all results demon-strated a p michigan and large water bodies where stratification of the sediment based upon physics of the system exists.

关键词： Lake michigan Sediments Nonparametric Comparison Tests Cross-Validation Analysis

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