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71.
Summary The reaction of syndiotactic poly(methacrylic acid) with dicyclohexylcarbodiimide in the presence of benzylamine yields syndiotactic methacrylic acid-methacryloyl-N-benzylamide copolymers. A limiting conversion to amide of about 62% and a tendency of alternation for the monomer units is observed by1H-NMR. The amidation is accompanied by the formation of a smaller amount of cyclic imide as a side reaction. The imide portion can also be transformed into amide by a consecutive hydrolysis step. 相似文献
72.
Hariharan M Wowchuk C Nkansah P Gupta VK 《Drug development and industrial pharmacy》2004,30(6):565-572
This study discusses the effect of formulation composition on the physical characteristics and drug release behavior of controlled-release formulations made by roller compaction. The authors used mixture experimental design to study the effect of formulation components using diclofenac sodium as the model drug substance and varying relative amounts of microcrystalline cellulose (Avicel), hydroxypropyl methylcellulose (HPMC), and glyceryl behenate (Compritol). Dissolution studies revealed very little variability in drug release. The t70 values for the 13 formulations were found to vary between 260 and 550 min. A reduced cubic model was found to best fit the t70 data and gave an adjusted r-square of 0.9406. Each of the linear terms, the interaction terms between Compritol and Avicel and between all three of the tested factors were found to be significant. The longest release times were observed for formulations having higher concentrations of HPMC or Compritol. Tablets with higher concentrations of Avicel showed reduced ability to retard the release of the drug from the tablet matrix. Crushing strength showed systematic dependence on the formulation factors and could be modeled using a reduced quadratic model. The crushing strength values were highest at high concentrations of Avicel, while tablets with a high level of Compritol showed the lowest values. A predicted optimum formulation was derived by a numerical, multiresponse optimization technique. The validity of the model for predicting physical attributes of the product was also verified by experiment. The observed responses from the calculated optimum formulation were in very close agreement with values predicted by the model. The utility of a mixture experimental design for selecting formulation components of a roller compacted product was demonstrated. These simple statistical tools can allow a formulator to rationally select levels of various components in a formulation, improve the quality of products, and develop more robust processes. 相似文献
73.
Christina Svensson 《Journal of the American Oil Chemists' Society》1976,53(6):443-445
The tendency in the oil and fat industry in Europe as far as by-products and spent material are concerned is to use and regenerate
as much as possible for chemical-technical purposes. Materials with a high thermal value which are not suitable or profitable
for use in chemical-technical products will in the future probably be utilized as a fuel in combination with fuel oil. By-products
and spent material that cannot be exploited in the manners outlined above will be deposited in dumps. Incineration is another
possibility. However, the quantities of waste must be of a considerable magnitude if this method is not to be too expensive. 相似文献
74.
Banerjee Robin; Yuill Nicola; Larson Christina; Easton Kate; Robinson Elizabeth; Rowley Martin 《Canadian Metallurgical Quarterly》2007,43(5):1084
Two experiments investigated children's implicit and explicit differentiation between beliefs about matters of fact and matters of opinion. In Experiment 1, 8- to 9-year-olds' (n = 88) explicit understanding of the subjectivity of opinions was found to be limited, but their conformity to others' judgments on a matter of opinion was considerably lower than their conformity to others' views regarding an ambiguous fact. In Experiment 2, children aged 6, 8, or 10 years (n = 81) were asked to make judgments either about ambiguous matters of fact or about matters of opinion and then heard an opposing judgment from an expert. All age groups conformed to the opposing judgments on factual matters more than they did to the experts' views on matters of opinion. However, only the oldest children explicitly recognized that opinions are subjective and cannot be "wrong." Implications of these results for models of children's reasoning about epistemic states are discussed. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
75.
Pressure variations on a train predominantly occur while trains are passing through tunnels. These aerodynamic effects may give rise to aural discomfort in railway passengers. We conducted a field study on the high speed railway track Cologne-Frankfurt/Main as well as a simulation study in our pressure chamber TITAN (DLR-Institute of Aerospace Medicine) with 31 subjects (mean age?=?37.7, SD?=?12.7; 51.6% male) to investigate pressure comfort for passengers. Continuous assessments of pressure events using sliders and retrospective assessments were acquired. Pressure variations were mostly tolerated. A comparison of field and laboratory setting revealed high congruency of continuous as well as retrospective assessments. A generalized estimating equation model identified pressure change attributes contributing to passengers' discomfort. Beside attributes of instantaneous pressure changes (e.g. high amplitudes, short durations), pressure events of the recent past significantly influenced current discomfort. Design engineers may use these findings to improve train and tunnel design. 相似文献
76.
Andreas Drakos Theofanis G. Orphanoudakis Christina Politi Alexandros Stavdas Andrew Lord 《Photonic Network Communications》2010,20(1):75-82
Clustering of nodes in optical networks has been proven to be an efficient way to serve end-to-end connectivity. However, clustering requires specific topological characteristics, or alternatively the introduction of significant alterations of an existing topology to achieve the expected performance improvements. The comparison of future dynamic optical networking technologies should therefore include in the set of initial assumptions, apart from the statistical properties of the traffic load, the network topology to draw conclusions regarding the efficiency as well as feasibility and scalability of the proposed solutions. In this article, we show how node clustering under the CANON architecture can be applied in real-life core networks and provide superior performance compared to conventional burst switching techniques in terms of blocking, resource utilization and power consumption. 相似文献
77.
Design of LTCC with High Thermal Expansion 总被引:1,自引:0,他引:1
Markus Eberstein Carsten Glitzky Marion Gemeinert Torsten Rabe Wolfgang A. Schiller Christina Modes 《International Journal of Applied Ceramic Technology》2009,6(1):1-8
New applications of low-temperature co-fired ceramics (LTCC), such as pressure sensors or integrated functional layers, require materials that possess higher coefficients of thermal expansion (CTE). To fabricate LTCC with elevated CTE, two methods of material design are examined: firstly, glass ceramic composites (GCC), which consist of >50 vol% glass in the starting powder, and, secondly, glass-bonded ceramics (GBC), where glass is added as a sintering aid only. The CTE of GBC is mainly determined by the crystalline component. For GCC, the CTE can be well predicted, if CTE and elastic data of each phase in the microstructure are known. A nonlinear characteristic of the CTE versus phase composition was found with increasing E crystals / E glass ratio and absolute CTE difference between the components. The glass composition and glass amount can be used to compensate the fixed properties of a crystalline material in a desired way. However, because the CTE and permittivity of a glass cannot be chosen independently, an optimum glass composition has to be found. For a given LTCC, it is possible to control the devitrification by shifting the glass composition. In this way, the resulting CTE values can be predicted more exactly and tailoring becomes possible. Different LTCC materials, based on the crystalline compounds Ba(La,Nd)2 Ti4 O12 , ZrO2 (Y-TZP), SiO2 (quartz), and specially developed glasses, possessing an elevated CTE of around 10 × 10−6 K−1 while showing permittivity ɛr between 6 and 63, are introduced. 相似文献
78.
P. Maguire, B. Devereux, F. Costello, and A. Cater (see record 2007-08734-012) discussed the Gagné and Shoben (1997) CARIN theory of conceptual combination and, after presenting a sample drawn from the British National Corpus and comparing the two corpora, concluded that the Gagné and Shoben corpus is too small and unrepresentative. They then discussed the mathematical model presented by Gagné and Shoben and claimed that the model does not incorporate relational competition. In this article, the authors present critical aspects of the mathematical model not considered by Maguire et al. and show that the mathematical instantiation of CARIN presented by Gagń and Shoben is, in fact, very sensitive to the number of strong competing relations. The authors then present some new comparisons between the corpora, showing that they correspond surprisingly well. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
79.
We present the transport unaware link improvement protocol (TULIP), which dramatically improves the performance of TCP over
lossy wireless links, without competing with or modifying the transport- or network-layer protocols. TULIP is tailored for
the half-duplex radio links available with today's commercial radios and provides a MAC acceleration feature applicable to
collision-avoidance MAC protocols (e.g., IEEE 802.11) to improve throughput. TULIP's timers rely on a maximum propagation
delay over the link, rather than performing a round-trip time estimate of the channel delay. The protocol does not require
a base station and keeps no TCP state. TULIP is exceptionally robust when bit error rates are high; it maintains high goodput,
i.e., only those packets which are in fact dropped on the wireless link are retransmitted and then only when necessary. The
performance of TULIP is compared against the performance of the Snoop protocol (a TCP-aware approach) and TCP without link-level
retransmission support. The results of simulation experiments using the actual code of the Snoop protocol show that TULIP
achieves higher throughput, lower packet delay, and smaller delay variance.
This revised version was published online in June 2006 with corrections to the Cover Date. 相似文献