• Title/Summary/Keyword: Wright

Search Result 319, Processing Time 0.032 seconds

A NEW EXTENSION OF THE MITTAG-LEFFLER FUNCTION

  • Arshad, Muhammad;Choi, Junesang;Mubeen, Shahid;Nisar, Kottakkaran Sooppy;Rahman, Gauhar
    • Communications of the Korean Mathematical Society
    • /
    • v.33 no.2
    • /
    • pp.549-560
    • /
    • 2018
  • Since Mittag-Leffler introduced the so-called Mittag-Leffler function in 1903, due to its usefulness and diverse applications, a variety and large number of its extensions (and generalizations) and variants have been presented and investigated. In this sequel, we aim to introduce a new extension of the Mittag-Leffler function by using a known extended beta function. Then we investigate ceratin useful properties and formulas associated with the extended Mittag-Leffler function such as integral representation, Mellin transform, recurrence relation, and derivative formulas. We also introduce an extended Riemann-Liouville fractional derivative to present a fractional derivative formula for a known extended Mittag-Leffler function, the result of which is expressed in terms of the new extended Mittag-Leffler functions.

Antarctic Marine Microorganisms and Climate Change: Impacts and Feedbacks

  • Marchant Harvey J.;Davidson Andrew T.;Wright Simon W.
    • Ocean and Polar Research
    • /
    • v.23 no.4
    • /
    • pp.401-410
    • /
    • 2001
  • Global climate change will alter many such properties of the Southern Ocean as temperature, circulation, stratification, and sea-ice extent. Such changes are likely to influence the species composition and activity of Antarctic marine microorganisms (protists and bacteria) which playa major role in deter-mining the concentration of atmospheric $CO_2$ and producing precursors of cloud condensation nuclei. Direct impacts of climate change on Antarctic marine microorganisms have been determined for very few species. Increasing water temperature would be expected to result in a southward spread of pelagic cyanobacteria, coccolithophorids and others. Growth rates of many species would be expected to increase slightly but nutrient limitation, especially micronutrients, is likely to result in a negligible increase in biomass. The extent of habitats would be reduced for those organisms presently living close to the upper limit of their thermal tolerance. Increased UVB irradiance is likely to favour the growth of those organisms tolerant of UVB and may change the trophic structure of marine communities. Indirect effects, especially those as a consequence of a diminution of the amount of sea-ice and increased upper ocean stratification, are predicted to lead to a change in species composition and impacts on both trophodynamics and vertical carbon flux.

  • PDF

Problems on Validity of the Goods Conformity Clauses in FOB Contracts (FOB 계약(契約)에서 물품적합성조항(物品適合性條項)의 유효성(有效性) 문제(問題) -The Mercini Lady 사건(事件)을 중심으로-)

  • Choi, Myung Kook
    • THE INTERNATIONAL COMMERCE & LAW REVIEW
    • /
    • v.58
    • /
    • pp.35-58
    • /
    • 2013
  • In Mash & Murrell, Diplock J said that "there is an implied warranty not merely that they shall be merchantable at the time they are put on the vessel, but that they shall be in such a state that they can endure the normal journey and be in a merchantable condition upon arrival." But in The Mercini Lady, Field J said that "the goods would be of satisfactory quality not only when the goods were delivered on to the vessel but also for a reasonable time thereafter." and "The proposed conditions were not excluded by clause 18. ${\cdots}$ clause 18 was not to be construed as extending to conditions ${\cdots}$". In relation to the problems on validity of the goods conformity clauses in FOB contracts, when considering Lord Wright's comments ("${\cdots}$ hence apt and precise words must be used to exclude it: the words guarantee or warranty are not sufficiently clear.") in Cammell Laird & Co Ltd v Manganese Bronze and Brass, FOB contracts are fundamentally one that seller's duty to deliver the goods is completing at the port of shipment and "principle of party autonomy" in Contract Law, I do not think that the terms implied by section 14 of the SGA and Common Law cannot absolutely excluded by the goods conformity clauses in sale contracts. Therefore, in order to exclude the implied terms, the parties must very clearly spell out this in the relevant clauses.

  • PDF

Collapsed L4 Vertebral Body Caused by Brucellosis

  • Ekici, Mehmet Ali;Ozbek, Zuhtu;Kazanci, Burak;Guclu, Bulent
    • Journal of Korean Neurosurgical Society
    • /
    • v.55 no.1
    • /
    • pp.48-50
    • /
    • 2014
  • Brucellosis is caused by gram-negative, aerobic, non-motile, facultative, intracellular coccobacilli belonging to the genus Brucella. A 50-year-old man working as an employee was admitted to neurosurgery clinic with severe low back, radicular right leg pain and hypoesthesia in right L4-5 dermatomes for 2 months. Brucella tube agglutination (Wright) test was positive in serum sample of the patient with a titer of 1/640. Brucella melitensis was isolated from blood culture. X-ray and MRI of the lomber spine showed massive collapse of L4 vertebral body. Neural tissue was decompressed and then posterior L3-5 short segment transpedicular screw fixation and stabilization was performed. Brucella melitensis was isolated from microbiologic culture of pathologic specimen. Antibiotic therapy was given as doxycycline 200 mg/day and rifampicin 600 mg/day for 6 months. Brucellosis is a systemic zoonotic infection and still an important public health problem in many geographical parts of the world. Vertebral body collapse caused by brucellosis occurs very rarely but represents a neurosurgical emergency because of its potential for causing rapidly progressive spinal cord compression and permanent paralysis. Neurosurgeons, emergency department personnel as well as infectious disease specialists should always keep a high index of suspicion and include brucellosis in the differential diagnosis of vertebral body collapse.

A Study on the Effect of Inclusions on the Fatigue Life of Titanium Investment Castings (티타늄 정밀주조품의 피로수명에 미치는 개재물의 영향에 관한 연구)

  • Park, Yong-Kuk;Ret, P.L.;Kim, Jin-Gon
    • Journal of Korea Foundry Society
    • /
    • v.26 no.2
    • /
    • pp.85-91
    • /
    • 2006
  • Inclusions in Ti investment castings are generally known to have detrimental effects on the performance of the castings. However, actual inclusions are infrequent and hard to be located. As a result, it is extremely difficult to obtain sufficient amount of fatigue test specimens of titanium investment castings having inclusions in the gage section. Thus, in-depth research of the adverse influence of inclusions is also hindered. To address this problem, a new casting methodology of specimens containing hard alpha inclusions was developed in this study. To guarantee successful introduction of an inclusion and casting, a carefully designed mold with 8 legs and a special tool were employed. After solidification, castings were cut, and X-ray radiography determined that the inclusions were successfully incorporated into the castings. The castings were further prepared to obtain multiple test specimens and they were fatigue-tested consecutively. Fractography analysis confirmed that fatigue cracks initiated at the hard alpha inclusion. In a nonlinear regression model, the fatigue life can be modeled as an exponential function with a negative exponent of the cross-sectional area of an inclusion. The fatigue life of Ti specimens containing inclusions is inversely proportional to the cross-sectional area of an inclusion.

Staining Characteristics of Mast Cell Tumor in a Hedgehog

  • Lee, Jong-Won;Han, Mi-Na;Kim, Gon-Hyung;Chang, Dong-Woo;Na, Ki-Jeong
    • Journal of Veterinary Clinics
    • /
    • v.33 no.4
    • /
    • pp.218-220
    • /
    • 2016
  • A 2-year old female African hedgehog (Atelerix albiventris) weighing 645 grams was presented with a well circumscribed mass in the subcutaneous of the left shoulder. It measured $2{\times}2cm$ in size and had a hard texture. There were no clinical signs. In a fine-needle aspiration (FNA) cytological evaluation, mast cells were identified with Wright-Giemsa stain. Mast cell tumor was confirmed and characterized by surgical sampling and histopathological evaluation. Four stains (hematoxylin-eosin, toluidine blue, periodic acid-Schiff, and Safranin O) were examined in order to find an applicable stain for a mast cell tumor histopathological evaluation in hedgehog. This case showed that periodic acid-Schiff and toluidine blue staining were the most useful for assessment of a mast cell tumor in a hedgehog.

Comparison of 5 Staining Methods for Somatic Cells in Dairy Goat Milk Samples (젖염소 유즙에 적용한 5가지 체세포 염색 방법의 비교)

  • Kim, Young-Chul;Park, Ha-Yeon;Lee, Youn-Kyung;Lee, Jeong-Chi;Su, Guk-Hyun;Lee, Chai-Yong
    • Journal of Veterinary Clinics
    • /
    • v.25 no.4
    • /
    • pp.274-279
    • /
    • 2008
  • This study was performed to investigate the best staining method for the somatic cell classification of dairy goat milk. Dairy goat milk samples, which were collected randomly from a dairy goat farm in Jeollanam-do, South Korea, were stained and analyzed with direct microscopic method, using 5 different staining methods; Wright's stain, Giemsa stain, Diff-quik stain, Newman's stain and Pyronin Y-Methyl Green stain, respectively. Among them, The Newman's staining was found to be the most rapid and effective method, for it required the shortest time for staining and provided the easiest way to classify somatic cells.

Component Analysis and Antioxidant Activity of Maca (마카(Lepidium meyenii)의 부위별 함유성분 및 항산화 활성 비교)

  • Park, Sung-Jin;Kim, Oak-Lan;Rha, Young-Ah
    • Culinary science and hospitality research
    • /
    • v.23 no.8
    • /
    • pp.137-144
    • /
    • 2017
  • This study examined the components and physicochemical properties of Lepidium meyenii as a natural health food source. To accomplish this objective, the general and antioxidative contents of Lepidium meyenii were measured. Total contents of carbohydrates, crude protein, crude lipid, and ash were 56.04%, 33.77%, 1.49%, and 3.7%, respectively(dry wright basis). Total phenol contents of the 70% ethanolic extracts of Lepidium meyenii were 189.9 mg/g, 152.5 mg/g. Total flavonoid contents of the 70% ethanolic extracts were 166.0 mg/g, 78.2 mg/g. The antioxidative activities of Lepidium meyenii were significantly increased in a dose dependent manner on DPPH(1,1-diphenyl-2-picrylhydrazyl) radical scavenging, ABTS (2,2'-Azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) diammonium salt) radical scavenging, FRAP(ferric reducing antioxidant power) activity, reducing power. The general nutrients and other antioxidant bioactive materials in Lepidium meyenii were also potential materials for good health food.

A Study on Electrical Modeling for Charge/Discharge Analysis of Li-Polymer Battery (리튬폴리머전지의 충/방전 특성해석을 위한 진기적모델링에 관한 연구)

  • 최해룡;반한식;목형수;신우석;고장면
    • The Transactions of the Korean Institute of Power Electronics
    • /
    • v.5 no.5
    • /
    • pp.435-442
    • /
    • 2000
  • Started upon Its discovery by Wright et al in 1773, studies on the solid polymer electrolyte are being carried out vigorously. So, models of Li-polymer battery have been developed through R-L-C components combination and PSpice functional block in this parer. The impedance characteristics of Li-polymer battery with R-L-C components are presented. Simulation results using PSpice functional model are compared with measured charge/discharge characteristics. Also, as to the number of cycle(charge/discharge), coulomb efficiency of Li-polymer is evaluated through experimental results.

  • PDF

Induction of Megakaryocytic Differentiation in Chronic Myelogenous Leukemia Cell K562 by 3-Hydrogenkwadaphnin

  • Meshkini, Azadeh;Yazdanparast, Razieh
    • BMB Reports
    • /
    • v.40 no.6
    • /
    • pp.944-951
    • /
    • 2007
  • 3-Hydrogenkwadaphnin (3-HK) is a daphnane-type diterpene ester isolated from Dendrostellera lessertii (Thymelaeaceae) with high differentiation and apoptotic potency in leukemic cells without any measurable adverse effects on normal cells (Moosavi et al., 2005b). In this study, we report that 3-HK (12 nM) has the ability to cease proliferation, induce differentiation and apoptosis in chronic myelogenous leukemia (CML) K562 cell line. The treated cells lost erythroid properties and differentiated along the megakaryocytic lineage based on the morphological features apparent after Wright-Giemsa staining, DNA content analysis and the expression of cell surface marker glycoprotein IIb as analyzed by flow cytometry. Moreover, using Hoechst 33258 and Annexin V double staining indicated the occurrence of apoptosis among the treated cells. On the other hand, restoration of the depleted GTP pool size by exogenous addition of guanosine ($50{\mu}M$) reduced the effect of the drug regarding the extent of differentiation while no further enhancement of 3-HK effect was obtained by addition of exogenous hypoxanthine ($100{\mu}M$). These interesting results necessitate further investigation regarding the mechanism of action of this unique anti-leukemic agent.