Multiwavelength Observations of the Blazar BL Lacertae: A New Fast TeV Gamma-Ray Flare

Combined with measurements made by very-long-baseline interferometry, the observations of fast TeV gamma-ray flares probe the structure and emission mechanism of blazar jets. However, only a handful of such flares have been detected to date, and only within the last few years have these flares been observed from lower-frequency-peaked BL Lac objects and flat-spectrum radio quasars. We report on a fast TeV gamma-ray flare from the blazar BL Lacertae observed by the Very Energetic Radiation Imaging Telescope Array System (VERITAS). with a rise time of ~2.3 hr and a decay time of ~36 min. The peak flux above 200 GeV is (4.2 ± 0.6) × 10^(−6) photon m^(−2) s^(−1) measured with a 4-minute-binned light curve, corresponding to ~180% of the flux that is observed from the Crab Nebula above the same energy threshold. Variability contemporaneous with the TeV gamma-ray flare was observed in GeV gamma-ray, X-ray, and optical flux, as well as in optical and radio polarization. Additionally, a possible moving emission feature with superluminal apparent velocity was identified in Very Long Baseline Array observations at 43 GHz, potentially passing the radio core of the jet around the time of the gamma-ray flare. We discuss the constraints on the size, Lorentz factor, and location of the emitting region of the flare, and the interpretations with several theoretical models that invoke relativistic plasma passing stationary shocks

Spectroscopic impact on protein and carbohydrate inherent molecular structures of barley, oat, and corn combined with wheat DDGS

Non-Peer Reviewe

Saskatchewan corn cultivars for grazing and silage: relationship between crop heat units and nutritional value

Non-Peer Reviewe

Effect of replacing corn grain by wheat-based dried distillers’ grains with solubles dietary energy and protein value in cattle

Non-Peer ReviewedThe objectives of this study were to determine the effect of replacing corn grain portion of the diet by wheat-based dried distillers’ grains with solubles (wDDGS) on feeding value for ruminants by chemical fractionation, nylon bag rumen degradation and nutrient modeling approaches. This study revealed that increasing wDDGS inclusion level increased most of nutritional composition linearly, except for starch which linearly decreased. Metabolizable protein supply in small intestine increased linearly with increasing levels of wDDGS. The inclusion of wDDGS in corn based diets decreased energy values of the diet slightly. Optimum ruminal N to energy balance for microbial growth was reached by replacing 25-50% of corn by wDDGS. In summary, this study suggests that corn and wheat DDGS combinations are a viable alternative for replace feed barley grain for the beef industry in western Canada

Multiwavelength Observations of the Blazar BL Lacertae: A New Fast TeV Gamma-Ray Flare

Combined with measurements made by very-long-baseline interferometry, the observations of fast TeV gamma-ray flares probe the structure and emission mechanism of blazar jets. However, only a handful of such flares have been detected to date, and only within the last few years have these flares been observed from lower-frequency-peaked BL Lac objects and flat-spectrum radio quasars. We report on a fast TeV gamma-ray flare from the blazar BL Lacertae observed by the Very Energetic Radiation Imaging Telescope Array System (VERITAS). with a rise time of ~2.3 hr and a decay time of ~36 min. The peak flux above 200 GeV is (4.2 ± 0.6) × 10^(−6) photon m^(−2) s^(−1) measured with a 4-minute-binned light curve, corresponding to ~180% of the flux that is observed from the Crab Nebula above the same energy threshold. Variability contemporaneous with the TeV gamma-ray flare was observed in GeV gamma-ray, X-ray, and optical flux, as well as in optical and radio polarization. Additionally, a possible moving emission feature with superluminal apparent velocity was identified in Very Long Baseline Array observations at 43 GHz, potentially passing the radio core of the jet around the time of the gamma-ray flare. We discuss the constraints on the size, Lorentz factor, and location of the emitting region of the flare, and the interpretations with several theoretical models that invoke relativistic plasma passing stationary shocks

Criteria for setting speed limits for Sri Lankan road ways

The available knowledge and studies which have been carried out on setting speed limits for Sri Lankan road ways are very limited. Speed limit, on a given roadway, is a much important factor for road users, because that decides the travel time. This research attempts to evaluate the applicability of speed limits for Sri Lankan road network and develop a methodology for setting up speed limit for selected road section. In the selection of road sections for this research, the scope was limited to straight road sections in flat terrains in sub-urban areas and other characteristics such as shoulder conditions, roadside development and etc pretty much equal. Then, the sample speed data was collected on selected road sections according to the vehicle category. The collected data was processed and compared with existing speed limits. Besides, a questionnaire survey was carried out in order to find out drivers' knowledge and attitude about speed limits on those selected road sections. According to the obtained results, only three-wheelers and buses exceeded the speed limits which were to be adopted on the road sections by drivers. Then, the speed limit for motor cycles, car/van/jeep, light goods vehicles can be increased while Speed limit for heavy vehicles is kept as of for these road sections. After considering the results of the questionnaire survey it can be suggested that the speed limits for three-wheelers and buses can be increased by 10 kmph with respect to their prevailing speed limit values

An unusually large myofibroblastoma in a male breast: a case report

<p>Abstract</p> <p>Introduction</p> <p>Myofibroblastoma of the breast is a rare benign stromal tumour seen predominantly in men. The gross appearance is that of a well-circumscribed nodule, characteristically small, seldom exceeding 3 cm. We present a case of an unusually large myofibroblastoma, which mimicked a malignant breast tumour.</p> <p>Case presentation</p> <p>A 65-year-old man presented with a rapid enlargement of the right breast over 6 weeks. Examination revealed a firm 15 cm hemispherical lump occupying the whole of the right breast with peau d'orange appearance of the overlying skin and distortion of the nipple. The clinical and radiological features suggested the possibility of sarcoma of the breast. However, a guided Tru-Cut biopsy was inconclusive. A mastectomy was performed to remove the tumour, which weighed more than 2 kg. Histopathology and immunocytochemistry revealed a mixed classical and collagenised type of myofibroblastoma. The patient is well with no evidence of recurrence 5 years after the mastectomy.</p> <p>Conclusion</p> <p>This unexpected presentation of an unusually large myofibroblastoma in a male breast is the largest reported to date. Myofibroblastomas can mimic malignant neoplasms and the clinical significance of this entity lies primarily in its recognition as a distinctive benign neoplasm.</p