Periodic solutions of the Duffing equation

Jale Tezcan,J. Kent Hsiao 국제구조공학회 2008 Structural Engineering and Mechanics, An Int'l Jou Vol.30 No.5

This paper presents a new linearization algorithm to find the periodic solutions of the Duffing equation, under harmonic loads. Since the Duffing equation models a single degree of freedom system with a cubic nonlinear term in the restoring force, finding its periodic solutions using classical harmonic balance (HB) approach requires numerical integration. The algorithm developed in this paper replaces the integrals appearing in the classical HB method with triangular matrices that are evaluated algebraically. The computational cost of using increased number of frequency components in the matrixbased linearization approach is much smaller than its integration-based counterpart. The algorithm is computationally efficient; it only takes a few iterations within the region of convergence. An example comparing the results of the linearization algorithm with the “exact” solutions from a 4th order Runge- Kutta method are presented. The accuracy and speed of the algorithm is compared to the classical HB method, and the limitations of the algorithm are discussed.

Antibiotic Resistance of Acinetobacter baumannii in Iran: A Systemic Review of the Published Literature

Jale Moradi,Farhad B. Hashemi,Abbas Bahador 질병관리본부 2015 Osong Public Health and Research Persptectives Vol.6 No.2

Objectives: Acinetobacter baumannii is a bacterium responsible for health careassociated infections, and it frequently develops multiple drug resistance (MDR). The prevalence of antibiotic-resistant A. baumannii in Iran has increased, and this may cause significant clinical problems. Therefore, in order to elucidate the development of antibiotic resistance, we performed a systematic review of the literature published on antibiotic-resistant A. baumannii reported in Iran. Methods: Thirty-six publications that met the criteria for inclusion were reviewed from an initial 87 papers. Selected papers published between 2008 and September 2014, were categorized on the basis of the sample collecting year been between 2001 and 2013. Results: Analysis of data revealed that, in general, there was an increase in antimicrobial resistance. During the initial time point of these studies (2001-2007) there was a high rate of resistance to all antibiotics, with the exception of carbapenems, lipopeptides, and aminoglycosides that had a low resistance rate in comparison with the others. Also, the resistance rate was increased in one group of these three antimicrobial groups from 2010 to 2013. In particular, there was an increase in resistance to carbapenems (imipenem and meropenem) from 2010-2011 and 2012-2013, whereas no significant change in the resistance rate of the other two antimicrobial groups (lipopeptides and aminoglycosides) during the study time was observed, although we did observe certain trends in amikacin (aminoglycoside group antibiotic) between 2011-2012 and 2012-2013. Conclusion: These findings indicate that antimicrobial resistance of A. baumannii in Iran has increased, which may very well affect the antimicrobial resistance of this organism worldwide. Based on these results, novel prevention and treatment strategies against A. baumannii infections are warranted. Furthermore, these data may assist in revising treatment guidelines and regional policies in care units to slow the emergence of antimicrobial resistance.

Evaluation of Mycobacterium tuberculosis Early Secreted Antigenic Target 6 Recombinant Protein as a Diagnostic Marker in Skin Test

Jale Moradi,Nader Mosavari,Mahmoud Ebrahimi,Reza Arefpajohi,Majid Tebianian 질병관리본부 2015 Osong Public Health and Research Persptectives Vol.6 No.1

Objectives: Tuberculosis (TB) is the leading infectious disease in the developing world. Delayed-type hypersensitivity skin test diagnoses TB using tuberculin purified protein derivative (PPD), but this test is incapable of distinguishing Mycobacterium tuberculosis (MTB) infection from bacillus Calmette-Gue´rin (BCG) vaccination or an infection caused by nontuberculous mycobacteria (NTM). This study was performed to evaluate the use of recombinant early secretory antigenic target 6 (rESAT-6), a secretory protein found only in MTB, Mycobacterium bovis, and few other mycobacterial species, as a skin marker for MTB in guinea pigs. Methods: We prepared recombinant MTB ESAT-6 and evaluated its use as a specific antigen for MTB in guinea pigs. Results: Our results show that the purified MTB rESAT-6 antigen is capable of inducing a positive reaction only in guinea pigs sensitized to MTB. No such reaction was observed in the animals sensitized to M. bovis, BCG vaccination, or NTM (Mycobacterium avium). Conclusion: Our study results confirm that the ESAT-6 antigen is more specific to MTB infection than PPD and could be used in more specific skin tests for detection of MTB in large animals and in humans.

Determination of niacin profiles in some animal and plant based foods by high performance liquid chromatography: association with healthy nutrition

( Jale Çatak ) 한국축산학회(구 한국동물자원과학회) 2019 한국축산학회지 Vol.61 No.3

Vitamin B₃ (niacin) is essential for all living cells and plays a central role in energy metabolism and oxidative phosphorylation. Vitamin B₃, a water-soluble vitamin, is present in the form of nicotinic acid and nicotinamide, a monocarboxylic acid derivative of pyridine. While nicotinic acid is commonly effective in lowering cholesterol levels, unlike nicotinic acid, nicotinamide is ineffective on lipids. Presence rates of nicotinic acid and nicotinamide, which are the available forms of vitamin B₃, are different for each food. However, the studies in the literature are generally based on the analysis of total amount of vitamin B₃ in foods and the studies determining the profile of vitamin B₃ in foods are limited. The aim of the study was to determine the vitamin B₃ profiles of 10 kinds of animal based food and 10 different plant based food samples. In this study, 10 kinds of animal based food samples consisting of veal (veal steak fillet), chicken (breast), turkey meat (thigh), goat meat (leg, belly), lamb (leg, back, arm), mutton (belly), bovine meat (loin) and 10 different plant based food samples namely; barley, rye, wheat (bread), wheat (durum), oat, rice, dried pea, green lentil, red lentil and chickpea were studied by high performance liquid chromatography using post-column derivatization system. The presence rates of nicotinic acid and nicotinamide were determined in the meat samples as 30% and 70% and as 87% and 13% in the cereal and legume samples, respectively. Nicotinic acid levels were found in low amounts in the meat samples. The amounts of nicotinic acid in the cereal and legume samples were significantly higher than the meat samples. Consequently, the plant based foods such as cereals and legumes, with a ratio of 87% nicotinic acid presence, standout as the best source of nicotinic acid and encouraging regular intake of those cereals and legumes containing rich nicotinic acid would remove nicotinic acid deficiency in human.

Periodic solutions of the Duffing equation

Tezcan, Jale,Hsiao, J. Kent Techno-Press 2008 Structural Engineering and Mechanics, An Int'l Jou Vol.30 No.5

This paper presents a new linearization algorithm to find the periodic solutions of the Duffing equation, under harmonic loads. Since the Duffing equation models a single degree of freedom system with a cubic nonlinear term in the restoring force, finding its periodic solutions using classical harmonic balance (HB) approach requires numerical integration. The algorithm developed in this paper replaces the integrals appearing in the classical HB method with triangular matrices that are evaluated algebraically. The computational cost of using increased number of frequency components in the matrixbased linearization approach is much smaller than its integration-based counterpart. The algorithm is computationally efficient; it only takes a few iterations within the region of convergence. An example comparing the results of the linearization algorithm with the "exact" solutions from a 4th order Runge- Kutta method are presented. The accuracy and speed of the algorithm is compared to the classical HB method, and the limitations of the algorithm are discussed.

Steric Effect on the Nucleophilic Reactivity of Nickel(III) Peroxo Complexes

Kim, Jalee,Shin, Bongki,Kim, Hyunjeong,Lee, Junhyung,Kang, Joongoo,Yanagisawa, Sachiko,Ogura, Takashi,Masuda, Hideki,Ozawa, Tomohiro,Cho, Jaeheung American Chemical Society 2015 Inorganic Chemistry Vol.54 No.13

<P>A set of nickel(III) peroxo complexes bearing tetraazamacrocyclic ligands, [Ni<SUP>III</SUP>(TBDAP)(O<SUB>2</SUB>)]<SUP>+</SUP> (TBDAP = <I>N</I>,<I>N</I>′-di-<I>tert</I>-butyl-2,11-diaza[3.3](2,6)pyridinophane) and [Ni<SUP>III</SUP>(CHDAP)(O<SUB>2</SUB>)]<SUP>+</SUP> (CHDAP = <I>N</I>,<I>N</I>′-dicyclohexyl-2,11-diaza[3.3](2,6)pyridinophane), were prepared by reacting [Ni<SUP>II</SUP>(TBDAP)(NO<SUB>3</SUB>)(H<SUB>2</SUB>O)]<SUP>+</SUP> and [Ni<SUP>II</SUP>(CHDAP)(NO<SUB>3</SUB>)]<SUP>+</SUP>, respectively, with H<SUB>2</SUB>O<SUB>2</SUB> in the presence of triethylamine. The mononuclear nickel(III) peroxo complexes were fully characterized by various physicochemical methods, such as UV–vis, electrospray ionization mass spectrometry, resonance Raman, electron paramagnetic resonance, and X-ray analysis. The spectroscopic and structural characterization clearly shows that the NiO<SUB>2</SUB> cores are almost identical where the peroxo ligand is bound in a side-on fashion. However, the different steric properties of the supporting ligands were confirmed by X-ray crystallography, where the CHDAP ligand gives enough space around the Ni core compared to the TBDAP ligand. The nickel(III) peroxo complexes showed reactivity in the oxidation of aldehydes. In the aldehyde deformylation reaction, the nucleophilic reactivity of the nickel(III) peroxo complexes was highly dependent on the steric properties of the macrocyclic ligands, with a reactivity order of [Ni<SUP>III</SUP>(TBDAP)(O<SUB>2</SUB>)]<SUP>+</SUP> < [Ni<SUP>III</SUP>(CHDAP)(O<SUB>2</SUB>)]<SUP>+</SUP>. This result provides fundamental insight into the mechanism of the structure (steric)–reactivity relationship of metal peroxo intermediates.</P><P>A set of nickel(III) peroxo complexes, [Ni<SUP>III</SUP>(TBDAP)(O<SUB>2</SUB>)]<SUP>+</SUP> and [Ni<SUP>III</SUP>(CHDAP)(O<SUB>2</SUB>)]<SUP>+</SUP>, were prepared. The spectroscopic characterization clearly shows that the NiO<SUB>2</SUB> cores are almost identical. However, the different steric properties of the supporting ligands were confirmed by structural characterization. The nucleophilic reactivity of the nickel(III) peroxo complexes was highly dependent on the steric properties of the macrocyclic ligands, with a reactivity order of [Ni<SUP>III</SUP>(TBDAP)(O<SUB>2</SUB>)]<SUP>+</SUP> < [Ni<SUP>III</SUP>(CHDAP)(O<SUB>2</SUB>)]<SUP>+</SUP>.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/inocaj/2015/inocaj.2015.54.issue-13/acs.inorgchem.5b00294/production/images/medium/ic-2015-002943_0012.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ic5b00294'>ACS Electronic Supporting Info</A></P>

Mantle Cell Lymphoma, Blastoid Variant, Diagnosed on the Basis of Cytomorphology and Flow Cytometric Immunophenotyping of the Lymph Node Aspirate and Peripheral Blood

Mi-JaLee,Keun-HongKee,Ho-JongJeon 대한의학회 2002 Journal of Korean medical science Vol.17 No.2

In vitro bioaccessibility of added folic acid in commercially available baby foods formulated with milk and milk products

Mustafa Yaman,O¨ mer Faruk Mızrak,Jale C¸ atak,Hafsa Sena Sargın 한국식품과학회 2019 Food Science and Biotechnology Vol.28 No.6

Milk contains a certain amount of folate bindingproteins. The binding capacity varies in acidic conditionsand affects the bioavailability of folic acid. Folic acid iscommonly added into baby foods to ensure adequate intakeof infants. The aim of this study was to determine thebioaccessibility of added folic acid in baby foods formulatedwith milk and milk products under different gastricpH values by an in vitro digestive system. The bioaccessibilityof folic acid ranged between 56–71 and 35–49% ininfant formula samples, between 59–78 and 31–67% incereal-based baby foods, and between 42–67 and 38–57%in follow-on baby milk at gastric pH 1.5 and pH 4,respectively. Our results demonstrate that the bioaccesibilityof folic acid that is added to baby food is affected bygastric pH. Therefore, it was observed that the bioaccesibilityof folic acid was lower in the higher gastric pH.

영문지(JAST)게재논문 : Sahiwal 젖소의 최적 유생산을 위한 착유방법 측정 연구

( Naveed Aslam ),( Muhammad Abdullah ),( Muhammad Fiaz ),( Jalees Ahmad Bhatti ),( Zeeshan Muhammad Iqbal ),( Nasrullah Bangulzai ),최창원 ( Chang Weon Choi ),조익환 ( Ik Hwan Jo ) 한국동물자원과학회(구 한국축산학회) 2014 축산기술과 산업 Vol.5 No.2

24두의 Sahiwal 젖소를 대상으로 착유횟수와 방법에 의한 생산량 변화를 측정하였다. 선발된 시험축은 완전임의배치법으로 6두씩 4그룹으로 공시되었다. A와 B 그룹의 젖소들은 손 착유법으로 착유하되 각각 일일 2회 및 3회 착유하였고 C와 D그룹의 젖소들은 기계 착유법으로 착유하되, 각각 일일 2회 및 3회 착유 하였다. 전 두수는 동일한 사료와 사양관리 하에서 유지되었다. 건물 섭취량은 일일 3회 착유하는 그룹에서 높게 나타났고 이것은 손 착유법과 기계 착유법 간에도 차이를 보이지 않았다. 일일 2회 착유와 비교해서 일일 3회 착유 시 유량이 높았고(P<0.05), 손 착유법와 기계 착유법 간의 차이는 없었다. 손 착유법과 기계 착유법을 이용한 그룹 모두에서 유지방 비율은 일일 3회 착유보다 2회 착유 시 높게 나타났고(P<0.05), 총고형물 비율 역시 유지방 비율과 비슷한 패턴을 보였다. 하지만, 단백질, 유당, 무지고형물 비율들은 시험구간 유의적 차이를 보이지 않았다(P>0.05). 결론적으로 본 연구결과는 Sahiwal 젖소에 있어서 8시간 간격으로 2회 착유하는 것보다 3회 착유하는 것이 손 착유법이나 기계 착유법 모두에서 유량을 극대화할 수 있는 방법임을 보여주고 있다.

RESEARCH : Open Access ; Evaluation of different milking practices for optimum production performance in Sahiwal cows

( Naveed Aslam ),( Muhammad Abdullah ),( Muhammad Fiaz ),( Jalees Ahmad Bhatti ),( Zeeshan Muhammad Iqbal ),( Nasrullah Bangulzai ),( Chang Weon Choi ),( Ik Hwan Jo ) 한국동물자원과학회(구 한국축산학회) 2014 한국축산학회지 Vol.56 No.13

The production performance of multiparous lactating Sahiwal cows (n = 24) was evaluated according to both milking frequency and method. Selected animals were randomly divided into four groups containing six animals each under a completely randomized design. Cows in groups A & B were milked by the hand milking method three times per day, respectively. Similarly, cows in groups C & D were milked by the machine milking method two and three times per day, respectively. All animals were maintained under uniform feeding and management conditions. Dry matter intake was high in animal groups milked three times per day, and it remained unchanged between the hand and machine milking methods. Milk yield was higher (P < 0.05) in cows milked three times compared to those milked twice per day, and it did not differ between hand and machine milking methods. Milk fat percentage was higher (P < 0.05) in cows milked twice per day compared to those milked three times using both machine and hand milking methods. The percentage of total solids showed a similar pattern as the fat percentage. However, percentages of protein, lactose, and non-fat solids in milk were not significantly different(P > 0.05) among the treatment groups. Collectively, the results show that milking three times per day instead of twice at 8-hour intervals can enhance milk yield in Sahiwal cows using both hand and machine milking methods.