1,722,130 research outputs found
A Multi-modal Trip Distribution Model
No full textThis paper presents a multimodal trip distribution function estimated and validated for the metropolitan Washington region. In addition, a methodology for measuring accessibility, which is used as a measure of effectiveness for networks, using the impedance curves in the distribution model is described. This methodology is applied at the strategic planning level to alternative HOV alignments to select alignments for further study and Right-of-Way preservation.MNCPPC - Montgomery County Planning DepartmentLevinson, David M; Kumar, Ajay. (1995). A Multi-modal Trip Distribution Model. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/179850
Revealing the role of intellectual capital in digitalized health networks. A meso‐level analysis for building and monitoring a KPI dashboard
No full textMultiple magnetic interactions and large inverse magnetocaloric effect in TbSi and TbSi0.6Ge0.4
Full text linkWe present a comprehensive investigation of the electronic structure, magnetization, specific heat, and crystallography of TbSi (FeB structure type) and TbSi0.6Ge0.4 (CrB structure type) compounds. Both TbSi and TbSi0.6Ge0.4 exhibit two antiferromagnetic (AFM) transitions at TN1≈ 58~K and 57~K, and TN2≈ 36~K and 44~K, respectively, along with an onset of weak metamagnetic-like transition around 6~T between TN1 and TN2. High-resolution specific heat (CP) measurements show the second- and first-order nature of the magnetic transition at TN1 and TN2, respectively, for both samples. However, in the case of TbSi, the low-temperature (LT) AFM to high-temperature (HT) AFM transition takes place via an additional AFM phase at the intermediate temperature (IT), where both LT to IT AFM and IT to HT AFM phase transitions exhibit a first-order nature. Both TbSi and TbSi0.6Ge0.4 manifest significant magnetic entropy changes (ΔSM) of 9.6 and 11.6~J/kg-K, respectively, for Δμ0H=7~T, at TN2. The HT AFM phase of TbSi0.6Ge0.4 is found to be more susceptible to the external magnetic field, causing a significant broadening in the peaks of ΔSM curves at higher magnetic fields. Temperature and field-dependent specific heat data have been utilized to construct the complex H-T phase diagram of these compounds. Furthermore, temperature-dependent x-ray diffraction measurements demonstrate substantial magnetostriction and anisotropic thermal expansion of the unit cell in both samples.This is a preprint from Kumar, Ajay, Prashant Singh, Andrew Doyle, Deborah L. Schlagel, and Yaroslav Mudryk. "Multiple magnetic interactions and large inverse magnetocaloric effect in TbSi and TbSi Ge ." arXiv preprint arXiv:2405.06777 (2024). doi: https://doi.org/10.48550/arXiv.2405.06777. Published as Kumar, Ajay, Prashant Singh, Andrew Doyle, Deborah L. Schlagel, and Yaroslav Mudryk. "Multiple magnetic interactions and large inverse magnetocaloric effect in TbSi and TbSi 0.6 Ge 0.4." Physical Review B 109, no. 21 (2024): 214410.
doi: https://doi.org/10.1103/PhysRevB.109.214410
Bacillus pumilus strain YSPMK11 as plant growth promoter and bicontrol agent against Sclerotinia sclerotiorum
Full text linkAbstract
A study was executed in a direction to attenuate Sclerotinia stalk rot (SSR) disease through biocontrol agent and also to enhance crop productivity. Culture filtrate of bacterial strain YSPMK11 inhibited growth of Sclerotinia sclerotiorum in vitro which also exhibited higher plant growth promoting attributes. Interaction studies revealed maximum (81.50%) growth inhibition at 35 °C and pH 7.0 after 72 h incubation period with 15% culture filtrate. Based upon 16S rRNA gene sequence strain, YSPMK11 was identified as Bacillus pumilus. Furthermore, the genome of this isolate was searched for antimicrobial lipopeptide, i.e., ItuD and SrfC genes. The PCR amplification results showed the presence of both these lipopeptide genes in isolate YSPMK11. Iturin A as antifungal compound was identified as major components of fraction through GC/MS. In field experiments, the application of strain YSPMK11 cell suspension (108 CFU/ml) suppressed disease severity by 93% and increased curd yield by 36% which was more that of commercially used fungicide in farmer practices under mid-hills of Himachal Pradesh. Conclusively, our study is first to demonstrate the effect of B. pumilus strain YSPMK11 in suppression of SSR under field conditions and would be employed as an efficient biocontrol agent to replace commercial fungicides in cauliflower cropping system. In addition, the presence of both lipopeptide genes (ItuD and SrfC) and iturin A in this isolate makes him potent strain for biological control application in agriculture.</jats:p
The Rational Locator: Why Travel Times Have Remained Stable
No full textThis paper evaluates household travel surveys for the Washington metropolitan region conducted in 1968 and 1988, and shows that commuting times remain stable or decline over the twenty year period despite an increase in average travel distance, after controlling for trip purpose and mode of travel. The average automobile work-to-home time of 32.5 minutes in both 1968 and 1988 is, moreover, very consistent with a 1957 survey showing an average time of 33.5 minutes in metropolitan Washington. Average trip speeds increased by more than 20 percent, countering the effect of increased travel distance. This change was observed during a period of rapid suburban growth in the region. With the changing distributional composition of trip origins and destinations, overall travel times have remained relatively constant. The hypothesis that jobs and housing mutually co-locate to optimize travel times is lent further support by these data.MNCPPC - Montgomery County Planning DepartmentLevinson, David M; Kumar, Ajay. (1994). The Rational Locator: Why Travel Times Have Remained Stable. Retrieved from the University Digital Conservancy, http://dx.doi.org/10.1080/01944369408975590
BAYESIAN APPROACH ON THE COMPARISON DRUG THROUGH LEVEL OF MICROALBUMINURIA IN TYPE 2 DIABETES PATIENTS
No full textRakesh K Saroj, Mukesh Kumar Ajay Kumar, Dr. K Narasimha Murth
Temporal Variations on the Allocation of Time
No full textThis study investigates the allocation of time and trip-making across time-of-day, day-of-week, and month-of-year, as well as over the past forty years. Some interesting findings result. People are working much more, shopping somewhat more on weekends, and stay at home less today than forty years ago. Time spent in travel on each weekend day (Saturday or Sunday) exceeds that on any weekday, as it did forty years ago. Time spent shopping on a typical day in the busiest month (December) is more than double that in the least busy month (September). Monthly variations in daily time in travel exceed 10 percent. The time of day patterns of shop and other trips for workers and nonworkers are both rational: nonworkers peak in mid-day away from rush hour while workers peak just after work, indicating trip chaining.MNCPPC - Montgomery County Planning DepartmentLevinson, David M; Kumar, Ajay. (1995). Temporal Variations on the Allocation of Time. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/179849
Operational Evidence of Changing Travel Patterns
No full textThis paper utilizes a traffic counts database covering a ten year period (1976-1985) to identify travel trends for Montgomery County, a suburb of Washington D.C. Generally, travel behavior is analyzed using person based travel survey data. The use of traffic counts to understand travel behavior is a relatively new approach. Unlike household surveys, which are typically characterized by respondent and sample bias, and require special effort for their collection, traffic counts are routinely collected by Departments of Transportation and provide the best available measure of observed traffic volumes. The study provides fresh evidence to support some of the earlier findings: an increase in lateral commuting as a share of travel, changes in work and non-work trip proportions, and increase in peak spreading. An interesting result in this paper relates to a more pronounced directionality in radial as compared with lateral trips. The relative symmetry of traffic flows along lateral routes compared with radial routes results in better utilization of the suburban road network. Non-work trips emerge as the more elastic trips, shifting to off-peak hours with an increase in congestion.MNCPPC - Montgomery County Planning DepartmentLevinson, David M; Kumar, Ajay. (1994). Operational Evidence of Changing Travel Patterns. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/179847
An Overview on Carbon Fiber-Reinforced Epoxy Composites: Effect of Graphene Oxide Incorporation on Composites Performance
No full textCarbon fiber-reinforced polymer (CFRP) composites are used in a variety of applications such as aircraft, automobiles, body armors, and the sports sector owing to their ultra-strong and lightweight characteristics. However, the incorporation of an untreated pristine carbon fiber surface leads to a weak interfacial interaction with the polymeric matrix, thus triggering catastrophic failure of the composite material. Graphene oxide, a 2D-macromolecule consisting of several polar functional groups such as hydroxyl, carboxyl, and carbonyl on the basal planes and edges, tends to increase the surface area and has thus been applied between the fiber and matrix, helping to improve CFRP properties. Herein, we condense different routes of functionalization of GO nanosheets and their incorporation onto a fiber surface or in a carbon fiber-reinforced epoxy matrix, helping to improve the interfacial adhesion between the fiber and matrix, and thus allowing effective stress transfer and energy absorption. The improvement of the interfacial adhesion between the fiber and carbon fiber-reinforced epoxy matrix is due to the peculiar structure of GO nanoparticles composed of polar groups, especially on the edges of the nanosheets, able to provide strong interaction with the hosting cured epoxy matrix, and the “core” part similar to the structure of CFs, and hence able to establish strong π-π interactions with the reinforcing CFs. The article also covers the effect of functionalized graphene oxide incorporation on the mechanical, thermal, electrical, and viscoelastic properties of composite materials reinforced with carbon fibers
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