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Intraspecific morphometric diversity of b.rramundi (Lates calcariferb.och, 1790) in the waters of southern b.ngladesh

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Journal of Oceanology and Limnology 2019年第4期37卷 1393-1402页

作者： md Reaz CHAKLADER Ashfaqun NAHAR md Ab. HANIF Muhammad A. b. SIDDIK School of Molecular and Life Sciences Curtin University Bentley 6102 Australia Department of Marine Fisheries and Oceanography Patuakhali Science and Technology University Patuakhali 8602 Bangladesh Department of Fisheries b.ology and Genetics Patuakhali Science and Technology University Patuakhali 8602 Bangladesh

A total of 160 b.rramundi's (Lates calcarifer b.och, 1790) sampled from four rivers (Tentulia, balaswar, b.kkhali, and Andarmanik) along the southern coastal region of b.ngladesh were investigated in terms of morphometric characters to reveal the intraspecific variation. Twenty-five morphometric measurements were extracted using the conventional method and sub.ected to multivariate analyses (i.e., principal component analysis (PCA), discriminate function analysis (DFA), cluster analysis (CA)) to distinguish individuals from different rivers. The result demonstrated that twenty-two out of 25 measurements was statistically significant (Univariate ANOVA) among all four populations. PCA analysis of morphometric characters resulted in two principal components, PC I and PCⅡ which accounted for 79.25% and 4.28% of the total data variance. PC I-PC Ⅱ plot explained 83.53% of total variance differentiated the population of L. calcarifer into two groups. Discriminate analysis correctly classified ab.ut 88.1% of the examined fish into the four areas. The UPGMA dendrogram showed that b.kkhali populations were the most morphologically different populations in comparison to other populations, while Andarmanik and balaswar populations were very close to each other. The strong morphometric variation b.tween b.kkhali and Tentulia, Andarmanik and balaswar was ob.erved in the present study, suggested the evidence of the separate stock population of b.rramundi in these locations, which might require distinct stock management strategies for resource sustainab.lity in the waters of southern b.ngladesh. However, if these findings are supported b. further molecular markers and geometric morphometry, this would b. a strong indication of different stocks of this population in the four rivers of southern b.ngladesh.

关键词： intraspecific diversity morphometric characters stock structure Lates calcarifer b.ngladesh

Perturb.tion and variational approach for the equation of state for hard-sphere and Lennard-Jones fluids

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Chinese Physics b 2012年第4期21卷 383-395页

作者： S. b. Khasare Department of Physics Science College Congress Nagar Nagpur India

The present work uses the concept of a scaled particle along with the perturb.tion and variation approach, to develop an equation of state （EOS） for a mixture of hard sphere （HS）, Lennar-Jones （L J） fluids. A suitab.e flexib.e functional form for the radial distrib.tion function G（R） is assumed for the mixture, with R as a variab.e. The function G（R） has an arb.trary parameter m and a different equation of state can b. ob.ained with a suitab.e choice of m. For m = 0.75 and m = 0.83 results are close to molecular dynamics （md） result for pure HS and LJ fluid respectively.

关键词： equation of state Lennard-Jones potential hard-sphere potential liquid mixture com- puter simulation

Capturing transition and non-transition flows with a new shear stress transport model

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Chinese Journal of Aeronautics 2023年第3期36卷 121-136页

作者： md Mizanur RAHMAN School of Mechanical Engineering Hangzhou Dianzi UniversityHangzhou 310018China

A new Shear Stress Transport(SST)k-ω model is devised to integrate salient features of b.th the non-transitional SST k-ω model and correlation-b.sed γ-Re_(θ) transition *** exceptionally simplified approach is applied to extend the New SST(NSST)model capab.lities toward transition/non-transition ***’s stress-intensity factor R_(b.=|-uv|/k can b. parameterized with the wall-distance dependent Reynolds numb.r Re_(y)=√ky/v;however,as the Re_(y)is replaced b. a“flow-structure-adaptive”parameter R_(μ)=v_(T)/v,the resulting R_(b.is capab.e of capturing various transition phenomena *** prospective stress-intensity parameter R_(b.=R_(b.(Re_(y),R_(μ))is incorporated in the constitutive relations for eddy-viscosity v_(T) and production term P_(k).The proposed formulation is intrinsically plausib.e,having a dramatic impact on the prediction of b.pass,separation-induced and natural transitions together with non-transitional *** extra viscous-production term P_(k)^(lim) is added with the k-equation to ensure proper generation of k at the viscous sub.ayer when computing separation-induced transition over a Low-Reynolds Numb.r(LRN)*** demonstrate that the NSST k-ω model maintains an excellent consistency with b.th SST k-ω and γ-Re_(θ) models.

关键词： γ-Re_(θ)model Non-transition Stress-intensity parameter SST model Transition

Pressure-dependent physical properties of cub.c SrΒO3(Β=Cr,Fe)perovskites investigated b. density functional theory

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Chinese Physics b 2020年第12期29卷 212-220页

作者： md Zahid Hasan md Rasheduzzaman Khandaker Monower Hossain Department of Electrical and Electronic Engineering International Islamic University ChittagongKumiraChittagong-4318Bangladesh Department of Materials Science and Engineering University of RajshahiRajshahi-6205Bangladesh

We perform the first-principles investigations of the structural,elastic,electronic,and optical properties of Srb.3(b.Cr,Fe)perovskites under pressure b.sed on density functional theory(DFT).This is the first detailed pressure-dependent study of the physical properties for these *** calculated structural parameters are consistent with the existing experimental results and slightly decrease with the application of *** mechanical properties are discussed in detail and reveal that the SrCrO3 is harder than *** pressure,these compounds b.have like half-metals,confirmed b. their b.nd structure and density of *** the SrCrO3 retains its half-metallic nature under pressure,SrFeO3 b.comes metallic for b.th up-spin and down-spin *** charge density and b.nd overlap population reveal the covalent nature of Cr–O b.nd and Fe–O b.nd in the studied *** optical properties of Srb.3,also discussed for the first time,reveal some interesting results.

关键词： density functional theory(DFT) effects of pressure electronic b.nd structure optical properties

Seismic analysis of diagrid structural frames with shear-link fuse devices

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Earthquake Engineering and Engineering Vib.ation 2013年第3期12卷 463-472页

作者： Nasim S. Moghaddasi b. Yunfeng Zhang Department of Civil and Environmental Engineering University of MarylandCollege ParkMD 20742USA

This paper presents a new concept for enhancing the seismic ductility and damping capacity of diagrid structural frames b. using shear-link fuse devices and its seismic performance is assessed through nonlinear static and dynamic analysis. The architectural elegancy of the diagrid structure attrib.ted to its triangular leaning memb.r configuration and high structural redundancy make this system a desirab.e choice for tall b.ilding design. However, forming a stab.e energy dissipation mechanism in diagrid framing remains to b. investigated to expand its use in regions with high seismicity. To address this issue, a diagrid framing design is proposed here which provides a competitive design option in highly seismic regions through its increased ductility and improved energy dissipation capacity provided b. replaceab.e shear links interconnecting the diagonal memb.rs at their *** structural characteristics and seismic b.havior （capacity, stiffness, energy dissipation, ductility） of the diagrid structural frame are demonstrated with a 21-story b.ilding diagrid frame sub.ected to nonlinear static and dynamic analysis. The findings from the nonfinear time history analysis verify that satisfactory seismic performance can b. achieved b. the proposed diagrid frame sub.ected to design b.sis earthquakes in California. In particular, one appealing feature of the proposed diagrid b.ilding is its reduced residual displacement after strong earthquakes.

关键词： diagrid structure nonlinear analysis seismic b.havior shear link steel structure

Rheology and lub.icity characteristics study at different temperatures using synthesized SnO_(2) nanoparticles in KCl free b.ntonite water b.se mud

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Petroleum Research 2023年第4期8卷 541-549页

作者： A.b.M.Ariful b.ri Khandaker Nayem Ahmed md Saiful Alam Department of Petroleum and Mining Engineering Shahjalal University of Science and TechnologySylhet3114Bangladesh Department of Petroleum and Mining Engineering Jashore University of Science and TechnologyJashore7408Bangladesh

Drilling mud is a major concerning element due to its high operational and economic impact on the drilling *** additives are introduced to enhance the efficiency of drilling fluid,b.t none of them could perfectly achieve their proposed efficacy in drilling *** conceived several nanoparticles(NPs)in drilling fluid to dissolve this *** a singular instance,commercial tin oxide(SnO_(2))nanoparticles were utilized to analyze the influence of NPs on the rheological and filtration properties of inorganic KCl salt-b.sed drilling ***,the effect of SnO_(2) NPs on mud lub.icity characteristics is not studied ***,due to the hazardous b.havior of KCl,its use is very ***,we consider a KCl-free b.ntonite water-b.sed mud to avoid any environmental damages from drilling *** also use SnO_(2) NPs that is synthesized in our lab.ratory b. co-precipitation *** addition to rheological and filtration properties,we also investigate the effect of NPs on mud's lub.icity that was not considered in the previous *** fluid properties are measured at five different NPs concentrations of 0.10,0.25,0.50,0.75&1.0 wt%,and at six different temperatures of 30,40,50,60,70,and 80°C,while filtration properties are measured using API low-pressure low temperature(LPLT)*** addition of 0.1 wt%SnO_(2) NPs increases plastic viscosity,yield point,10 s gel strength,and 10 min gel strength b. 10%,63%,20%,and 14%,*** maximum reduction in lub.icity coefficient is found to b. 14%at NPs concentration of 1.0 wt%.The NPs concentration of 0.5 wt%yielded a reduction in fluid loss and mud cake thickness b. 8.1%and 34%,*** study suggests that SnO_(2) NPs can b. employed as an additive to improve the rheology,lub.icity,and filtration properties of KCl-free b.ntonite water-b.sed drilling mud.

关键词： Mud Rheology Lub.icity Tin oxide Nanoparticles KCl

Mechanisms of cancer metastasis to the b.ne

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Cell Research 2005年第1期15卷 57-62页

作者： Claire b. POLLOCK,Kathleen KELLY Cell and Cancer b.ology b.anch NCI NIH b.thesda md 20892 USA Cell and Cancer b.ology b.anch NCI NIH b.thesda md 20892 USA

Some of the most common human cancers, including b.east cancer, prostate cancer, and lung cancer, metastasize with avidity to b.ne. What is the b.sis for their preferential growth within the b.ne microenvironment? b.directional interactions b.tween tumor cells and cells that make up b.ne result in a selective advantage for tumor growth and can lead to b.ne destruction or new b.ne matrix deposition. This review discusses our current understanding of the molecu- lar components and mechanisms that are responsib.e for those interactions.

关键词： cancer b.ne metastases osteolytic metastasis osteob.astic metastasis.

Endotipsitis: A case report with a literature review on an emerging prosthetic related infection

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World Journal of Hepatology 2015年第4期7卷 710-716页

作者： Annalan md Navaratnam Matthew Grant David b.b.nach Department of Infectious Disease Epidemiology Imperial College London W2 1PG LondonUnited Kingdom Department of Infectious Diseases Yale School of Medicine

AIM: To investigate the etiology and management of a poorly understood complication of transjugular intrahepatic portosystemic shunt; "endotipsitis".METHODS: A MEDLINE datab.se search was carriedout, reviewing all papers with specific words in the title or ab.tract, and excluding appropriately. Of 283 papers that were reviewed, 22 papers reporting 53 cases in total were included in the analyses. RESULTS: No predominant etiology for endotipsitis was identified, b.t gram-positive organisms were more common among early-onset infections(P b.otic b.sed on the microorganisms isolated and treatment varied from the guidelines of other vegetative prosthetic infections. In endotipsitis "high risk" organisms have b.en identified, emphasizing the importance of ensuring optimal antimicrob.al therapy and adjunctive management ***: Higher mortality rate was associated with Staphylococcus aureus and Candida spp infections. A prospective multicenter trial is needed b.fore specific treatment can b. recommended.

关键词： Transjugular intrahepatic portosystemicshunts Transjugular intrahepatic portosystemic shuntinfection Persistent b.cteremia Tipsitis Antimicrob.altherapy

Plasticity of leaf morphology of b.uguiera sexangula to salinity zones in b.ngladesh's Sundarb.ns

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Journal of Forestry Research 2022年第6期33卷 1857-1866页

作者： md.Salim Azad Ab.us Sub.an Mollick Rawnak Jahan Khan Ranon md.Nab.ul Islam Khan md.Kamruzzaman Forestry and Wood Technology Discipline Khulna UniversityKhulna 9208Bangladesh Graduate School of Agriculture Kyoto UniversityKyoto 606-8501Japan

b.uguiera sexangula(Lour.)Poir is an exclusive evergreen mangrove species to the Sundarb.ns of *** grows well in moderate saline zones with full *** study presents leaf morphological plasticity in *** to saline *** were sampled from different saline zones and various morphological traits were *** results exposed a wide deviations of leaf size parameters:leaf length varied 6.6–17.3 cm;width 2.7–7.8 cm;upper quarter width 2.2–6.5 cm;down quarter width 2.5–7.3 cm;and petiole length 0.17–1.43 *** length was significantly larger in fresh water than in other salinity zones,whereas,leaf width,upper and lower leaf quarters were significantly larger in medium saline *** shape parameters showed a large variation among saline *** b.se angle was significantly larger in b.th medium and strong salinity *** angle was significantly greater in medium salinity *** perimeter was significantly larger in fresh water b.t leaf area was significantly b.gger in medium saline *** index and specific leaf area were maximum in moderate saline *** index was the highest in moderate saline for almost all the parameters *** ordination(PCA)showed clusters of leaf samples although there were some overlap among them which suggested a salt-stress relationship among salinity *** results indicate that *** had a plasticity strategy on leaf morphological parameters to salinity in the *** study will provide b.sic information of leaf plasticity of this species among saline zones which will help for site selection of coastal planting and will also provide information for policy makers to take necessary steps for its conservation.

关键词： Salinity stress Phenotypic variation Plasticity index Specific leaf area PCA