Development of a Mathematical Model for the Estimation of Required Maintenance for a Homogenous Facilities Portfolio Using Multiple Linear Regression

The maintenance and upkeep of a university facilities portfolio requires the facilities manager to be vigil in overseeing the facilities’ care and to aggressively and innovatively pursue maintenance funds. The problem of insufficient maintenance funds compounded by the budgetary requirement of advanced fund requests in the university environment can cause shortfalls in maintenance dollars. This lack of maintenance funding has led to increased deferred maintenance. Deferring maintenance has negative consequences for the university’s mission. Thus, in pursuing university dollars to further maintenance activities, a facilities manager must be able to substantiate the funds requested. This research discusses the existing maintenance-prediction models that have contributed in estimating maintenance costs. Also, the causes and impacts of deferring maintenance are investigated in the literature review. The research shows how a facilities manager can take historical facility-attribute data from a maintenance work-order system and develop a prediction equation by using multiple regression analysis for predicting required maintenance. The derived prediction equation’s results were compared with those of three popular models discussed in the research. The prediction equation’s results strongly correlated with all three of the models

Factorization in quaternion orders

AbstractHurwitz's proof of Lagrange's theorem that every positive integer is a sum of four squares of integers is but one of the extensive list of articles which relate quaternion arithmetics to quaternary (and ternary) quadratic forms (see [Marie-France Vignéras, Arithmétique des algèbres the quaternions, in “Lecture Notes in Mathematics,” Vol. 800, Springer-Verlag, New York, 1980] for a partial bibliography). Hurwitz's argument uses the property that a quaternion in the ring of Hurwitz quaternions with norm divisible by a prime p has a factor of norm p. The purpose of this article is to determine the connections between factorization in general quaternion orders over the integers, the ideal theory of the order and the genus structure of the corresponding quadratic lattice; and to list the positive definite quaternion orders which admit various types of factorization. Our work can be viewed as a continuation of Gordon Pall's initial investigations in [Trans. Amer. Math. Soc. 59 (1946), 503–513; Duke Math. J. 4 (1938), 696–704]

The Relationship Between Handgrip Fatigue and Performance Scores in NCAA Division I Women\u27s Artistic Gymnasts

Maximal isometric handgrip strength (HGS) is used as an indicator of overall muscular strength and has also been found to be predictive of certain athletic events sporting prowess. We recently found that HGS was not related to performance scores in female collegiate gymnasts. However, handgrip fatigue (HGF) has previously been found to strongly relate to HGS in male gymnasts, but has never been examined in relation to performance scores (from 0 to 10 as perfect) in any gymnasts, male or female. PURPOSE: Examine the relationship between HGF and performance scores for the 4 events of vault, uneven bars, beam, and floor in female collegiate gymnasts. METHODS: Twenty-five (n=25) female National Collegiate Athletic Association (NCAA) Division I women’s artistic gymnasts (age: 20.1±1.3 yrs; height: 158.9±5.6 cm; mass: 58.2±5.3 kg) were assessed for absolute HGF in kg and relative HGF (HGF/height in m2), as well as their average vault, uneven bars, beam, and floor performance scores across a competitive season. For the HGF measurement, subjects maximal absolute HGS was determined first. Then, subjects held 50% of their absolute HGS until failure. Then, within 10 sec. a second maximal HGS measurement was taken as the absolute HGF value. Pearson correlation coefficients (r) were determined between HGF measurements and all performance scores. RESULTS: The performance scores were: average vault (9.72±0.01), uneven bars (9.75±0.05), beam (9.58±0.19), and floor (9.47±0.43). Absolute HGF (21.8±3.1 kg) was significantly (p\u3c0.001) strongly correlated (r = 0.62) with absolute HGS (30.8±4.4 kg). No significant (p\u3e0.05) correlations were found between absolute HGF or relative HGF (8.5±1.3 kg) and any 4 gymnastics event’s performance scores (r range: -0.59-0.36 or r range: -0.46-0.17, respectively). CONCLUSIONS: In the current population of gymnasts, HGF was strongly related to HGS, but absolute HGF or relative HGF were not related to any gymnastics events performance scores. Findings from this study can be used by athletes, coaches, and practitioners in the collegiate women’s gymnastics realm

Fisch – frisch in Zollikofen

Seit diesem Herbst bietet die HAFL einen Fachkurs in Aquakultur an. Auch im Bachelorstudium können sich die Studierenden neu in Fischzucht bilden.Cet automne, la HAFL a lancé une formation continue en aquaculture. Et les étudiants de bachelor peuvent eux aussi suivre un nouveau module à option sur le sujet

Aquaforum: Eine tier- und umweltfreundliche Aquakultur

Die Hochschule für Agrar-, Forst- und Lebensmittelwissenschaften der Berner Fachhochschule (BFH-HAFL) und das Inforama lancieren das «Aquaforum»

Seedling Development and Yield of Winter Wheat under Lo-till and Conventional Tillage

Crop Scienc