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cSEE Journal of Power and Energy Systems 2019年第2期5卷 171-180页

作者： Panagiotis n.Papadopoulos Jovica V.Milanovic School of Electrical and Electronic Engineering The University of ManchesterManchesterM601QDU.K.

A methodology for online and offline dynamic stabil-ity assessment,suitable for power systems with high penetration of power electronics interface units is presented in this *** increasing penetration of renewable energy resources as well as changing market operations,new types of loads and storage technologies,are causing significant changes to power systems dynamic *** generator groups and generators exhibiting poorly damped oscillatory behavior are identified online,opening the possibility to corrective control actions in order to stabilize the ***,statistical analysis of the abundant data from simulations provides information on the overall impact of power electronics interface units on system stability.

关键词： Decision trees dynamicsecurityassessment probabilistictransientstability

Effects of Salacia lehmbachii ethanol root bark extract on estrous cycle and sex hormones of female albino rats

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Asian pacific Journal of Reproduction 2018年第6期7卷 274-279页

作者： Grace A.Essiet Godwin c.Akuodor Daniel OJ Aja Mathew O.nwokike Desmond O.Eke Anuli n.chukwumobi Department of Pharmacology Faculty of Basic Medical SciencesCollege of Medical SciencesUniversity of CalabarCalabarNigeria Department of Pharmacology and Therapeutics Faculty of MedicineEbonyi State UniversityAbakalikiNigeria Department of Internal Medicine Chukwuemeka Odumegwu Ojukwu University Teaching HospitalAwkaNigeria

Objective:To evaluate the effect of Salacia lehmbachii (S. lehmbachii) ethanol root bark extract on estrous cycle and sex hormones in female rats. Methods: Forty-eight virgin rats with regular 4-day cycle were grouped into four and each group was further subdivided into 'a' and 'b' (n=6). Each group was orally treated for 28 days with 2 mL of distilled water (control), ethanol root bark extract ofS. lehmbachii in doses of 250, 500 and 750 mg/kg/body weight (groups 2, 3, 4, respectively). Estrous cycle was determined daily using the vaginal smear method. Rats in'a' subgroups were weighed and sacrificed on the 29th day, and blood was collected for serum generation which was used for hormonal assay and sex organs were removed and weighed. Rats in 'b' subgroups were discontinued from treatment for 2 weeks and the parameters above were ***:The mean length of estrous cycle and duration of diestrous of treated rats were prolonged dose dependently compared to control. The increase was significant (Pnd 750 mg/kg. The other estrous phases were shortened in the same pattern. Relative weights of sex organs were reduced significantly (Pnes levels were significantly (Pced compared to control. The above changes reverted towards the control values two weeks post ***: Ethanol root bark extract ofS. lehmbachii (high doses) has antifertility effect in female rats as it prolongs the estrous and diestrous cycle, and reduces serum sex hormones levels. The observed alterations were reversible.

关键词： Salacia lehmbachii Ovulation Estrous cycle Root bark Female sex hormones

Spatial confirmation of termite mounds as bio-geo indicator for groundwater occurrences using ground magnetic survey: A case study from Perambalur Region of Tamil nadu, India

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Journal of Groundwater Science and Engineering 2022年第2期10卷 184-195页

作者： A Muthamilselvan b Preethi Department of Remote Sensing Bharathidasan UniversityTrichy-23Tamil NaduIndia

Termite mounds are conventionally surmised as one of the best bio-geological indicator for groundwater occurrence in places where they *** magnetic survey was carried out to prove the assumption about termite mounds as an important indicator for groundwater *** of 18 Termite mounds were mapped using handheld GPS to identify the suitable trend for magnetic *** considering all the criteria such as power lines,fences and fracture system,termite mound 2,12 and 18 were selected in the nnE-SSW trend,and the ground magnetic survey was conducted in ESE-WnW direction which is perpendicular to the trend of the termite mounds using Proton Precession ***,99 samples were collected with 5 m sampling interval and 50 m profile interval over an area of 22500 *** magnetic values varied from–7363 nT to 898 nT with the mean of–331 *** map of reduction to Equator indicates the presence of nnE-SSW and WnW-ESE magnetic *** signal map designated the presence of magnetic low in the WnW-ESE direction which coincides spatially with the magnetic *** magnetic profile lines have also brought to light the structurally weak *** body depth range was estimated using power spectrum and Euler method which are from 120 m to 40 m and100 m,*** present study appreciably brings out the spatial relationship between the termite mounds and the *** confirms the assertion with regard to termite mounds as an effective tool for groundwater exploration.

关键词： Termite mound bio-geological indicator Groundwater exploration Magnetic survey

Primary dendrite growth kinetics and rapid solidification mechanism of highly undercooled Ti-Al alloys

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Journal of Materials Science & Technology 2020年第5期40卷 47-53页

作者： Z.c.Luo H.P.Wang Department of Applied Physics Northwestern Polytechnical UniversityXi’an 710072China

The rapid solidification processes of undercooled Ti-(47,50,54)at.%Al alloys were investigated by electromagnetic levitation(EML)method combined with a high-speed photoelectric *** maximum undercoolings of the three liquid alloys were 376 K,352 K and 316 K,*** processes corresponding to the primary dendrite growth and subsequent phase transition were recorded at various *** primary dendrite growth velocity V meets a double exponential relationship with the undercooling ***,a novel formula with physical meaning is proposed to explain that the more ordered liquid metal atoms accelerate the primary dendrite *** recalescences are found at all undercoolings for Ti-47 at.%Al alloy and at high undercoolings for Ti-50 at.%Al *** microstructures of solidified Ti-47 at.%Al alloys successively appear as coarse lamellar dendrites and finally evolve to refined parallel lamellar dendrites with the increasing *** T rises,the microstructures of solidified Ti-50 at.%Al alloys appear from coarse primary dendrites and interdendritic dendrites to refined lamellar *** the process from low undercooling to high undercooling,the primary phase of undercooled Ti-54 at.%Al alloys changes from r-Ti(r)to r-TiAl(r)and the microstructures of solidified alloys evolve from spherical primary dendrites and matrix phases to cellular dendrite ***,for the Ti-(47,50)at.%Al,the transformation temperature of metastable intermediateγphase decreases with the increase of ***,the microhardness of the three solidified alloys reaches the maximum when the undercoolings are 185 K,270 K and 316 K,respectively.

关键词： Electromagnetic levitation Rapid solidification Dendrite growth Microstructure Microhardness

Electron-phonon coupling of G mode and components of a combination mode in carbon nanotubes

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Electron-phonon coupling of G mode and components of a combi...

Temporal and spatial variation in the sediment volume along the beaches between Ovari and Kanyakumari(SE InDIA)

第九届全国光学前沿问题讨论会

作者： YIn Yan Walsh A G Vamivakas A n cronin S b Prober D E Goldberg b b Key Laboratory of Optical Physics Institute of PhysicsChinese Academy of Sciences Department of Physics Boston University Department of Electrical and computer Engineering Boston University Department of Applied Physics Yale University

＜正＞In an earlier report,an optical method was presented to directly measure electron-phonon coupling in carbon nanotubes（cnTs）by correlating the first and second harmonic of the resonant Raman excitation *** results for electron-phonon coupling with the radial breathing mode in 5 different nanotubes show coupling

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International Journal of Sediment Research 2013年第3期28卷 384-395页

作者： S.SARAVAnAn n.cHAnDRASEKAR V.JOEVIVEK centre for GeoTechnology Manonmaniam Sundaranar University civil Engineering Department Christ the King Engineering College

A 2-year set of profile data from Ovari to Kanyakumari beach,SE India has been analysed by using empirical orthogonal function(EOF) techniques to identify characteristic patterns of temporal and spatial variation in the sediment volume of the *** results show that variation in the sediment volume of the beach is determined by interaction between the biennial and seasonal *** analysis the pattern of alongshore sediment exchange along the study *** method facilitated separation of onshore-offshore and alongshore modes of sediment transfer and identification of the patterns of alongshore sediment *** eigenfunction modes confirm the dominance of biennial,annual,and biannual sediment transfers occurring on study *** sediment movement along the shoreline of study area is mainly governed by the forces associated with the incoming waves and the availability of sediments within the *** present investigation has been made as an attempt to appreciate the sediment movement in relation to wave activity along the *** longshore sediment transport is intensive in the northerly direction as compared to southerly *** normal condition is for and to be moved annually or more frequently in the shallows and on the *** and wave-driven currents cause longshore drift of sand along the beach and offshore.

关键词： beach Profile Sediment movement beach volume change India

nonlocal Free Energy of a Spatially Inhomogeneous Superconductor

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communications in Theoretical Physics 2012年第5期57卷 879-892页

作者： K.V.Grigorishin b.I.Lev boholyubov Institute for Theoretical Physics of the Ukrainian national Academy of Sciences 14-b Metrolohichna str.Kiev-03680Ukraine

The microscopic approach is developed for obtaining of the free energy of a superconductor based on direct calculation of the vacuum *** free energy functional of the spatially inhomogeneous superconductor in a magnetic field is obtained with help of the developed *** obtained functional is generalization of GinzburgLandau functionals for any temperature,for arbitrary spatial variations of the order parameter and for the nonlocality of a magnetic response and the order ***,the nonlocality of the magnetic response is the consequence of order parameter's *** extremals of this functional are considered in the explicit form in the low-and high-temperature limit at the condition of slowness of spatial variations of the order parameter.

关键词： uncoupling of correlations vacuum amplitude order parameter magnetic response nonlocality

Shareholders and Stakeholders:How Do Directors Decide?

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商事法论集

商事法论集 2012年第1期 409-428页

作者： Ren.E b.Adams Amir n.Licht Lilach Sagiv University of Queensland UQ business School

Few issues in the fields of strategy and corporate governance remain as contested as the topic of shareholders and *** while a great amount of research addresses this issue from descriptive. instrumental,and/or normative perspectives(Donaldson and Preston,1995),fewer studies examine the decisions of actual managers and no study to our knowledge has addressed this question at the level of board *** attributes of cotporate elites may influence their behavior and motivate their organizational approaches(Fiss and Zajac,2004;Hiller and Hambrick,2005).Policy makers,however,all

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Unsteady natural convection couette flow of heat generating/absorbing fluid between vertical parallel plates filled with porous material

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Applied Mathematics and Mechanics(English Edition) 2012年第3期33卷 303-314页

作者： b.K.JHA M.K.MUSA Department of Mathematics Ahmadu Bello UniversityZaria 234Nigeria Mathematics Unit School of Basic and Remedial StudiesAhmadu Bello UniversityFuntua 6007Nigeria

The extended brinkman Darcy model for momentum equations and an energy equation is used to calculate the unsteady natural convection couette flow of a viscous incompressible heat generating/absorbing fluid in a vertical channel （formed by two infinite vertical and parallel plates） filled with the fluid-saturated porous medium. The flow is triggered by the asymmetric heating and the accelerated motion of one of the bounding plates. The governing equations are simplified by the reasonable dimensionless parameters and solved analytically by the Laplace transform techniques to obtain the closed form solutions of the velocity and temperature profiles. Then, the skin friction and the rate of heat transfer are consequently derived. It is noticed that, at different sections within the vertical channel, the fluid flow and the temperature profiles increase with time, which are both higher near the moving plate. In particular, increasing the gap between the plates increases the velocity and the temperature of the fluid, however, reduces the skin friction and the rate of heat transfer.

关键词： heat generating/absorbing fluid natural convection flow porous material acceleration motion

HIDA scan for functional gallbladder disorder： ensure that you know how the scan was done

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Hepatobiliary & Pancreatic Diseases International 2017年第2期16卷 197-201页

作者： naeem Goussous Hadia Maqsood Ethan Spiegler Gopal c Kowdley Steven c cunningham Department of Surgery Saint Agnes Hospital Baltimore USA Department of nuclear Medicine Saint Agnes Hospital Baltimore USA

bAcKGROUnD： Despite the increasing use of fatty meal（FM） as a substitute for cholecystokinin（ccK） in pain reproduction during hepato-imino-diacetic acid（HIDA） scan in functional gallbladder disorder, there are no studies comparing the differences between ccK and FM. The present study was to compare the efficacy of FM in comparison of ccK in FGbD application. METHODS： Patients undergoing HIDA scans from August 2013 to May 2014 were divided into two groups： those undergoing ccK-stimulated HIDA scan versus FM-stimulated HIDA scan. These groups were compared according to demographics and HIDA ***： Of 153 patients, 70 received ccK and 83 FM. There was no difference regarding age, gender, gallstones, gallbladder ejection fraction and time to visualization. However, significantly more of the patients receiving ccK than FM experienced pain reproduction（61% vs 30%, P〈0.01）.cOncLUSIOnS： Stimulation of gallbladder contractility with a FM during HIDA is less than half as likely to reproduce biliary symptoms compared to ccK, despite similar ejection fractions and other parameters. It is essential that providers account for this difference when counseling patients regarding cholecystectomy for functional gallbladder disorder.

关键词： gallbladder dysfunction biliary dyskinesia cholecystokinin hepato-imino-diacetic acid