primary keys are nice but not essential
database design fora mere mortals 2nd ed
... Chapter 8: Keys 235 251 Topics Covered in This Chapter 251 Why Keys Are Important 252 Establishing Keys for Each Table 252 Candidate Keys 253 Primary Keys 261 Alternate Keys 268 Non -keys 268 Table-Level ... matter-of-fact, hands-on approach The books are not designed to address all the intricacies of a given technology, but they not avoid or gloss over complex, essential issues either Instead, they focus ... about the software he’s using to implement the database Problems of this nature are common and important to address, but they are beyond the scope of this work Introduction xxxix ❖ Note One good...
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The Design of the Borealis Stream Processing Engine pdf
... • if p is true of t but not of t , a deletion message is emitted for t, • if p is not true of t but is true of t , an insertion message is emitted for t , and • if p is not true of either t ... that are deemed to be less important The first and simplest idea limits the paths along which revisions will travel This can be achieved by allowing applications to declare whether or not they are ... possible because in general, local decisions are cheaper to make and realize, and are less disruptive Another implication is that transient problems are dealt with locally, whereas more persistent...
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Evaluation of the Innovated Disinfection Process with High Dissolved CO2
... water As shown in Fig 5, canal water and the river water (Table 2) shared lower initial FC numbers compared to the WWTP samples, but the FC log-inactivation was lower than 0.4 in the first 10 min, ... log-inactivation in 10 min, but after 10 min, the FC log-inactivation quickly increased The reason for these results is that these two samples had more initial FC numbers, and 10 was not long enough for ... log-inactivation Also, compared to the supercritical CO2 method, which requires pressures as high as 8-20 MPa (Ishikawa et al., 1995), this method saved lots of energy In addition, when compared to the high...
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Who’s Afraid of ID, A Survey of the Intelligent Design Movement
... Naturalism and empiricism are often erroneously assumed to be very nearly the same thing, but they are not In the case of Darwinism, these two foundational principles of science are in conflict ( Johnson ... materialism This idea does not hold water, because there is nothing in the Wedge Document that has not been publicized elsewhere for quite some time In fact, although Johnson did not use the term “wedge” ... class but which are not found even in rudimentary form in any species outside that class (Denton 1986, 105) The invariance of these constraints on the biological classes argues that they did not...
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Tài liệu Báo cáo khóa học: Quantitative analysis, using MALDI-TOF mass spectrometry, of the N-terminal hydrolysis and cyclization reactions of the activation 2 process of onconase pdf
... cyanogen bromide (CNBr) [13] Notomista and co-workers [12] showed that M23L substitution increased the catalytic activity of this variant relative to the native enzyme, but did not modify its potential ... pyroglutamyl at the N-terminus of ONC (M23L) is not accelerated by lowering the pH, as observed for free L-Gln in aqueous solutions [26] Strong basic conditions are not recommended, because protein degradation ... and Met1 removal are also clear In this case, the reaction is favored by higher guanidinium chloride concentrations, being completed in h at 4.5 M and M guanidinium chloride (data not shown), in...
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The Mechanical Design Process doc
... control functions are filled by microprocessors Physically, these are electric circuits, but the actual control function is provided by software programs in the processor These programs are assemblies ... design philosophy, design engineers sometimes consider manufacturing issues, but since they are not experts, they sometimes not make good decisions Concurrent engineering encourages having manufacturing ... that the problem statement does not give all the information needed to find the solution The potential solutions are not given and the constraints on the solution are incomplete This problem requires...
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RELEASE NOTES FOR VERSION 1.0 OF THE DATABASE pdf
... As a result, we cannot easily identify the pixels which are adversely affected by overexposure in those observations In version 1.0, a history entry has been added to the primary and FLUX HDU ... added to the primary and FLUX HDU of these FITS files to note that they possibly contain bad pixels which have not been properly identified We are developing an alternate method to identify the bad ... wavelengths in exposures which are long or have a very bright source on the slit There are also ghost images in the STIS CCD optical system (Gull et al., 2002) These are still present in the data...
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ON THE VALUATION OF GOODS AND SELECTION OF THE BEST DESIGN ALTERNATIVE docx
... manufacturer and are not included here for that reason Prices and values were corrected for in¯ation Also the brand names of the vehicles are not given here because the results not apply to the ... one or more attributes of a baseline product are modi®ed to form an alternative product having a value V The baseline and alternative are described in the survey and respondents are V À V PN ... from Eq Note, in using Eq to determine the value change for the attribute, it is not necessary to know K This is important, as the slope of f versus the price of the alternative need not and...
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Báo cáo khoa học: Mechanism of the ring contraction process in vitamin B12 biosynthesis by the anaerobe Propionibacterium shermanii under aerobic conditions docx
... 13C,18O-vitamin B12 biosynthesized aerobically and anaerobically in P shermanii are compared (Table 1), the 18O-retention ratios are almost identical These results show that vitamin B12 was biosynthesized ... although we did not confirm the presence of CobG in P shermanii, we can conclude that the characteristic aerobic process (hydroxylation at C20 by molecular oxygen catalyzed by CobG) does not occur in ... B12 biosynthesized via these two postulated anaerobic mechanisms should be detectable Meanwhile, another mechanism for the ring contraction process by the aerobe P denitrificans had been proposed...
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Assessment of the Content, Design, and Dissemination of the Real Warriors Campaign pptx
... Is Useful, but Navigation Is a Challenge for Some 22 Social Media Channels Are Not Fully Utilized 23 Not All Partners Are Actively ... organizations but are not stated on the website or in the campaign materials The goals of the campaign did not align as well with health professionals as with other target audiences There are important ... that they are not alone in experiencing and dealing with mental health concerns and that effective resources for care and treatment are available and effective These core messages are the following:...
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Báo cáo hóa học: " Biomechanical energy harvesting from human motion: theory, state of the art, design guidelines, and future directions" docx
... ds W= (3) θ and τ · dθ , W= (4) where force and torque are denoted as F and τ, respectively, and the linear and angular displacements are denoted as S and θ, respectively Next, we analyzed each ... 0.103 -0.044 0.047 0.029 Hip H-3 0.090 0.027 A1-4 are phases of work that are performed in the ankle joint, K1-4 are phases for the knee, and H1-3 are for the hip joint Work represents the net summation ... Center of mass also includes muscle negative work, but the magnitude is not known the latter type of motion in an energy-conversion device might not cause an additional load to the user The idea...
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báo cáo hóa học:" Repositioning and stabilization of the radial styloid process in comminuted fractures of the distal radius using a single approach: the radio-volar double plating technique" pot
... radial plate can be difficult Secondary dislocation did not occur in any of our patients Biomechanical data for this fixation are not available, but it seems that sufficient stability was Figure Illustrated ... sectioned, but care was taken to avoid direct contact between these tendons and the plate on the radial side Satisfactory anatomic repositioning and/or stabilization of the radial styloid process was not ... is that the radial plate in the Riklis technique works in the sagittal plane and is not only a buttress plate, but also fixes the fracture In this report on single-approach radio-volar plating,...
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Báo cáo sinh học: " Research Article Development of the Database for Environmental Sound Research and Application " pot
... that are attached to dedicated libraries are usually not free and can be quite expensive if ordering a number of sounds (and the sounds are usually copyrighted and thus not freely distributable) ... present or whether there are background sounds present Front End to the Database There are four main front end functions that are essential to the functioning of the database They are user enrollment ... Additional problems are the keywords are usually not standardized (so a search of “kitten” and “cat” would yield different sounds), and the copyright status of these clips is often not clear In contrast,...
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Báo cáo hóa học: "Molecular Dynamics Simulations of the Roller Nanoimprint Process: Adhesion and Other Mechanical Characteristics" pot
... direction) It is a force, not a pressure because the evaluation without considering the action area The resultant angle was obtained using the sine rule The force curve distribution indicates that ... distribution and slip vector at an imprint depth of nm for the two imprint processes are shown in Figs and 9, respectively A different forming mechanism was found in the normal stress distribution ... atoms that are located on the left side of the roller, and the other is the ‘‘pulled behavior’’ that occurs on the right side of the roller The ‘‘push’’ and ‘‘pull’’ action contributes to the...
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Results of the UNEP Foresight Process on Emerging Environmental Issues docx
... results is another factor Although scientific outputs are increasing, many of them are embedded in grey literature not widely distributed, or in costly scientific journals which are too expensive ... scales are increasing q Rapid interactions and dynamics between domains are pervasive q Processes of change are accelerating q More changes are non-linear, abrupt, and irreversible In short, we are ... that are recognized as very important by the scientific community, but are not yet receiving adequate attention from the policy community Definitions of ‘very important’ and ‘adequate’ are left...
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Modeling and optimization of the forward osmosis process parameters selection, flux prediction and process applications
... to thank all my family members and friends, especially my parents, Zhang Jie and others who I did not mentioned here but had contributed greatly, for their patient support and encouragement for ... impact Today’s membrane processes are used in three main areas The first area includes application such as seawater desalination or wastewater purification The second area includes applications such ... compared to these conventional technologies, membrane processes are often more energy efficient, simpler to operate and yield a higher quality product In addition, these membrane processes are...
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USING THE ANALYTIC HIERARCHY PROCESS APPROACH FOR ASSESSMENT OF THE STRENGTH OF UNIVERSITY-INDUSTRY-GRI COOPERATION IN VIETNAM
... Encouragement and support from parents and relatives are keys to the success of this work Last but not the least, support, patience and dedication from my lover are secret of the whole success ... Related to this are situations where they have ranked their alternatives by assuming that the ones they are aware of all are there Another type of decision is one in which people are unsure of ... numerical values of the distribution of questionnaire are presented in Table 1.7 Table 1.7: Distribution of questionnaire Distribution and Response • Total questionnaire distributed • Responded questionnaire...
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Behavior of Nitrite Oxidizers in the Nitrification/Denitrification Process for the Treatment of Simulated Coke-Oven Wastewater
... partial nitriifcation, the authors operated a test plant using simulated coak-oven wastewater prepared with chemical reagents for a period of about one year The nitrifiers population was monitored ... One of them was for DNA extraction and was washed with TE buffer at pH8.0, and stored at -20oC Another was for FISH analysis and was stored at -80oC The extraction of DNA was performed with Fast ... Figure Only in Run and 7, full nitrification was observed It was only in these two runs that were not added with thiosulfate Thiosulfate must have affected the activities of nitrite oxidizing bacteria...
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