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In Oracle,there are many errors related to the use of NULL.On the basis of many Oracle data manipulation experiments,this article discusses the proper use of NULL,including the concept of NULL,the determining,data updates,its relationship with the index and the sorting.
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In the customary methods of transmitting binary data the receiver, as a result of the decision process made on each transmitted pulse, prints out one of two symbols. Schemes are considered here in which the receiver prints out one of three symbols (single-null zone reception) or one of four symbols (double-null zone reception). These extra symbols permit the receiver to indicate when the a posteriori probabilities of the two transmitted states are nearly equal. Single-null zone reception is shown to be capable, under optimum conditions, of achieving about one-half of the improvement in information rate theoretically attainable by increasing the number of receiver levels without limit. Double-null reception, which splits the null zone and thereby retains polarity information, offers only a slight additional increase in rate. It affords a significant advantage over single-null reception, though, because it is much less sensitive to variations in null level.
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In this paper, we define rectifying curves in Minkowski space-time and characterize null, pseudo null and partially null rectifying curves in terms of their curvatures. Also, we give some explicit equations of null, pseudo null and partially null rectifying curves in $E^4_1$.
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This paper presents a simple method of forming sum and difference patterns with adaptive nulls. The effects on the sidelobe level and the pointing null of difference pattern by adaptive null are analyzed. The result that the increment value of the envelope of the sidelobe level under the effect of a null is less than 1.6dB is proved. The formula about shift value of the pointing null which is the function of the jammer direction and array parameters is given in the paper.
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Envelope (radar)
Value (mathematics)
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In this paper, we study inextensible flows of partially null and pseudo null curves in E_1^4. We give neccessary and sufficent conditions for inextensible flows of partially null and pseudo null curves in E_1^4
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The result "chronological spacetimes without lightlike lines are stably causal" is announced and motivated. It implies that chronological spacetimes which are null geodesically complete and satisfy the null genericity and the null (averaged) energy condition admit a time function.
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Energy condition
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A method of generating a single sharp null response in an otherwise omni-directional pattern using a circular array is discussed. The null width is reduced by the introduction of an abrupt phase reversal in the pattern function in the direction of the null. The null is also electronically steerable in the azimuth and in the elevation plane. Mutual coupling effect on the depth of the null is minimized through the use of sequence excitation components in the feed.
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Circular buffer
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In this paper, we study inextensible fows of partially null and pseudo null curves in E_1^4. We give neccessary and sufficent conditions for inextensible fows of partially null and pseudo null curves in E_1^4.
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