selection of the solid phase microextraction fiber

... compounds,importantfortheorganolepticcharacteristicsofdifferentwhiskeysandtheiracceptanceand liking bythe consumers, isbased onthe useof thesolid-phase microextraction (SPME)Arrow.After optimization,theproposedmethodwascomparedwithconventionalSPMEregardingtheanalysisof ... role in the development of an SPME method The chemi-cal nature and the volatility of the target analytes in the in-vestigated samples determines the type of coating used [26] In this work, the semi-polar ... in the injector port of the GC system based on the recommendations of the manufac-turers The quality of the conditioning process was confirmed by taking fiber blanks prior to the analysis All extractions

Ngày tải lên: 20/12/2022, 21:29

... sylvite) Trang 69End of Chapter 3Trang 701 - The Texture of an igneous rock is a Shape of the crystals b Size and arrangement of crystals c How hard of soft the rock feels d All of the above e I have ... Texture of igneous rocks is determined by a Pressure and temperature b Amount of sulfur in the magma c Rate of cooling of magma d Depth of cooling of magma e c and d only Trang 723 - The slower the ... 41Joint-controlled weathering in igneous rocks Trang 42Unloading and exfoliation of igneous rocks Trang 43Weathering Two kinds of weathering 2 Chemical weathering • Alters the internal structures of minerals

Ngày tải lên: 30/11/2016, 16:37

... it preserves the value of the level whereat all the laws of Boolean algebra are applied The principle of structural functionality is the following: The structure of any element of IBA can be ... in selection of the best consultant for the implementation of ERP project: table 8 shows the decision matrix for the criteria specified as the target The results are derived from the analysis of ... outcomes [11].The ability of individuals to meet the project's legal, functional, technical, and experience requirements is important in the selection of the project team so as the ability of a team-member

Ngày tải lên: 04/02/2020, 12:48

... of various influenced factors of the project preparation phase on the total construction time of a BOT road project Of the Vietnam context, acting as the first study focusing on identifying the ... (MLP) Results of the MLP model allow us to determine the role of each of the factors in affecting total construction time delay 2 MODELLING APPROACH The investigated factors Being the first study ... time” of a project implementation Finally, noted as a major problem of project delay in the practice of Vietnam [23], the problem of site clearance is investigated through two factors of the preparation

Ngày tải lên: 02/03/2020, 17:58

... provide a good and solid start to the innings They must be psychologically strong as they have to face the new ball at the start of the innings At the beginning of an innings, the new ball is hard, ... stage of the innings, these top order batsmen must bear the responsibility to solidify the team’s innings Tables 2, 3 and 4 respectively show the lists of the Test players shortlisted for the third ... awarded the Test status to become the 11th and 12th full members of the International Cricket Council (ICC) The frequency of Tests has steadily increased due to the increase in the number of participating

Ngày tải lên: 26/05/2020, 22:24

... presentations during the Process On the Elections Day at the final of the Olympic Candidature Process, the final presentation will be performed by the cities to the IOC members The host city for the Games ... benefits The evaluation of candidate cities for the Games will be performed with the use of 5 Selection of the Optimal Olympic Place Choice in Turkey 5.1 Criteria in the Analysis When the criteria ... presents the media effects on the tourism of the host city or region (Hughes, 1993; Kang & Perdue, 1994; Kemp, 2002; Tudge, 2003) and the effect of the Games on the city community in terms of social

Ngày tải lên: 26/05/2020, 22:27

... the internal standard The identification of the compounds was based on com-parison of their retention times with those of authentic samples, and on comparison of their EI-mass spectra with the ... define the actual composition of the vapor phase in equilibrium with the essential oil, and hence poorly applicable to the study of aromatherapy Bergamot (Citrus bergamia) is an endemic plant of the ... list of author information is available at the end of the article Trang 2phase In essence, the concentration of a compound in the headspace is proportional to its concentration in the liquid phase

Ngày tải lên: 29/05/2020, 12:39

... Conceptual Paradigm of the Study The output of the research as shown in Figure 4, will be the comparison of the level of awareness on Solid Waste Management, the differences of the Solid Waste Management ... experienced by most of the residents of the Philippines The poor sanitation of the residents could be from their improper solid waste management and practices Most of the solid wastes thrown ... and practices of households, the total quantity of the generated Trang 38waste of the selected municipality/city and the effects of solid waste in the environment Recommendation of measures on

Ngày tải lên: 02/04/2022, 17:02

... comprehensiveapproachofdatamining,atotalof79outof85compoundsandatotalof198outof202 compoundswereidentifiedinTHP1.0aerosolandin3R4FMTS,respectively.Amongtheidentified ana-lytes,asetof35compoundswasfoundinbothVPsampletypes.Semi-quantitativeanalyseswerecarried ... andketonesappearedtobeprominentin3R4FMTSVP,whereaslargeramountsofaldehydes,ketones, heterocyclichydrocarbonsandesterswerepresentinTHP1.0aerosolVP.Theresultsdemontsratethe capabilityandversatilityofthemethodforthecharacterizationandcomparisonofcomplexaerosol ... Tables1andS2,insomelimitedcases,eitherLRIdatawerenot (outofthe85)(Table1)and198(outofthe202)compoundswere Trang 9Table 2Summary of qualitative and semi-quantitative information for VP samples of THP1.0 aerosol

Ngày tải lên: 31/12/2022, 09:55

... (sample phase) into the organic phase immobilized within the pores of the hollow fiber In the second step, the analytes are back-extracted into another aqueous phase held inside the lumen of the ... liquid-phase microextraction There are several parameters that affect the performance of LPME, namely the pH of the aqueous solution, the type of the polymer-based hollow fiber and the type of organic ... favor of the deionization of analytes and to facilitate their distribution to the organic phase With the knowledge of the pKa value(s) of analytes would allow us to manipulate the acidity of the

Ngày tải lên: 10/11/2015, 11:00

... compact solid wastes in canyon/depression landfill vary with the geometry of the site, the characteristics of the available covey material, the hydrology and geology of the site, the type of the ... of organized secondary data due to the absence of documentation and organized database system with regarding to the turnoff the officers in the study area 1.7 Organization of the paper The ... chapters, the first chapter contains the introduction part with background of the study, statement of the problem, objectives of the study, project questions, scope, significance and limitation of the

Ngày tải lên: 15/08/2017, 15:10

... with water, the solubility of the analytes should be higher in the organic phase than the donor phase to promote the extraction of the analytes and the density of the extraction organic solvent ... of type of extraction solvent on extraction Trang 4the coefficient is a measure of the variation in estimating thecoefficient and T-value is the ratio of the coefficient to the stan-dard error The ... f is the number of factorial points in the design Using Eq.(1), the axial spacing of a = ±2 was calculated to satisfy the rotatability of the design The factors and their levels used in the CCD

Ngày tải lên: 13/01/2020, 17:01

... know that the migration of compounds from the urine, or liquid phase, to the headspace of the vial, or gas phase, depends on the volume of the liquid phase, the volume of the gas phase and the affinity ... reduces the vol-ume of the liquid phase while it increases the volvol-ume of the gas phase, which seems to promote the migration of compounds to the headspace of the vial This mirrors the fact ... in the liquid phase, which results in more compounds moving to the gas phase It is known that the addition of acid reduces the pH of the solution and increases the volatility of acids, while the

Ngày tải lên: 29/05/2020, 13:33

... centres of inver-sion to form a 2D sheet Due to the shape of the triamterene molecule (long and narrow) and the choice of the centroid as a rep-resentation of the molecule some of the out of plane ... [19] software to show the hydrogen bonded dimer shown in Fig. 1 and the hydrogen bonded contacts that will form the basis of the next part of the structural dis-cussion (see Fig. 2) One of the ... component code in which the last 2 digits signify the num-ber of the symmetry operator, the proceeding 3 digits give the lattice translation and the leading digits the atom num-ber The translation component

Ngày tải lên: 29/05/2020, 15:16

... confirm the tolerability of the new schedule that allows the administrations of higher doses of the antibody The results of our study together with previously published data warrant further evaluation ... of dose The median distribution of the CD3+ T cell count of all patients is plotted in Fig 3 One out of five evaluable patients evolved anti-EpCam antibodies during the trial The other four of ... a ob-served in the main dosing cohorts and an MTD was not achieved The results confirm the tolerability of the new schedule that allows the administrations of higher doses of the antibody We

Ngày tải lên: 21/09/2020, 01:45

... alternative The fact that the values determined for the intercepts are close to the respective EEVs of the tickets supports the use of the S-model in representing the aggregate behavior of buyers in the ... measure of value Use of the intercept as a phenomenological measure of the value of the product is also intuitive in the absence of the S-model The use of V±P as a measure of the driving force for ... the customer to the needs of the manufacturer and the loop on the left connects the needs of society to the needs of the manufacturer A necessary but not suf®cient condition for the manufacturer...

Ngày tải lên: 16/03/2014, 11:20

... out of the port of Palos, on the coast of the Gulf of Cádiz in southern Spain, not far from the modern city of Huelva The party reached the Canary Islands on August  and departed from there ... distances, in their case by sea, where they were often out of sight of land for days at a time Their landmarks were in the sky and on the sea The shape and direction of clouds, the position of the Sun, ... at the center of the circle A plumb line hangs from the center The person using the instrument first makes sure that the plumb line hangs vertically, down the center of the vertical arm of the...

Ngày tải lên: 29/03/2014, 04:21

... stand, or another form of coordinated operation Consequently, we shall not consider this element of the program in the analysis The fourth goal of the program is to improve the income of the taxi ... in models of so-called “rational scrappage”, where the optimal decision of the owner to keep or scrap the vehicle is based on the minimization of the present value of the costs from the two alternatives, ... consideration of the enforcement mechanisms needed to replace almost 80% of the taxi fleet in the Federal District Yet, there is some confusion in the official perception of how the taxi substitution...

Ngày tải lên: 29/03/2014, 14:20

... to the authors of such articles, one should also consider the publication of the recalculated data These data can be used to improve our dose-effect models, which aid the further improvement of ... based on the internal target volume (ITV) concept or the time-averaged mean position of the tumour PTV based on the ITV concept For 4D CT scans, the ITV can be derived from the union of GTV delineations ... inspection of the projected ITV contours on the CT-datasets of the end-inspiration and end-expiration phase bins using axial, sagittal and coronal views In addition to the MIP contouring, the GTV...

Ngày tải lên: 09/08/2014, 09:22

... oligomerization of pro-caspase results in its autocatalysis and/or activation, and the induction of the degradative phase of apoptosis through the activation of caspases and [23] An additional pathway of ... of Bcl2/Bcl-xL or by the complete ablation of Bax and Bak [22] Materials and methods The induction of apoptosis mediated by the extrinsic pathway is initiated by binding of death ligands to their ... 0.03) in the number of macrophages compared to Wt ankles More specifically, there was a 2.5-fold increase (p < 0.02) in the number of macrophages in the pannus of Bid-/compared to Wt joints There...

Ngày tải lên: 09/08/2014, 10:20