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Normally a list view is updated by a user directly by selecting a list view item and then editing or deleting it. New items are usually added at the bottom of the list. This works fine since the user knows which items have been changed or deleted and where the new items will pop up. A drawback of it is that, if the list is sorted, then new items will not be displayed in a sorted way, instead they will be listed in the order of being created.
標(biāo)簽：
list
view
selecting
Normally
上傳時(shí)間：
2017-07-02
上傳用戶：Pzj
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Abstract: Investment in smart meters and smart grid end equipment continues to grow worldwide as countriestry to make their electric delivery systems more efficient. However, as critical as the electric deliveryinfrastructure is, it is Normally not secured and thus subject to attack. This article describes the concept oflife-cycle security—the idea that embedded equipment in the smart grid must have security designed into theentire life of the product, even back to the contract manufacturer. We also talk about how life-cycle securityapplies to embedded equipment in the smart grid. Potential threats are discussed, as are potential solutionsto mitigate the risks posed by those threats.
標(biāo)簽：
智能電表
智能電網(wǎng)
上傳時(shí)間：
2014-12-24
上傳用戶：熊少鋒
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The LTC3546 is a dual output current mode buck regulatorwith fl exible output current partitioning. Beyondthe advantages Normally associated with dual outputregulators (reduced size, cost, EMI and part count, withimproved effi ciency), the LTC3546’s outputs can bepartitioned for either 3A and 1A outputs, or two 2A outputs.This increases its application range and simplifi esmultiple supply rail designs. A confi gurable Burst Mode®clamp for each output sets the current transition levelbetween Burst Mode operation and forced continuousconduction mode to optimize effi ciency over the entireoutput range. An adjustable switching frequency up to4MHz and internal power MOSFET switches allow forsmall and compact footprints.
標(biāo)簽：
460
DN
輸出
優(yōu)化效率
上傳時(shí)間：
2013-11-04
上傳用戶：yxgi5
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Photomultipliers (PMT), avalanche photodiodes (APD),ultrasonic transducers, capacitance microphones, radiationdetectors and similar devices require high voltage,low current bias. Additionally, the high voltage must bepristinely free of noise; well under a millivolt is a commonrequirement with a few hundred microvolts sometimesnecessary. Normally, switching regulator confi gurationscannot achieve this performance level without employingspecial techniques. One aid to achieving low noise is thatload currents rarely exceed 5mA. This freedom permitsoutput fi ltering methods that are usually impractical
標(biāo)簽：
DCDC
高電壓
低噪音
轉(zhuǎn)換器
上傳時(shí)間：
2013-10-28
上傳用戶：lhw888
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在汽車(chē)發(fā)動(dòng)機(jī)起動(dòng)時(shí)，若發(fā)動(dòng)機(jī)起動(dòng)后起動(dòng)機(jī)不能及時(shí)斷電，將會(huì)燒毀起動(dòng)機(jī)或損壞飛輪齒環(huán)；若變速器不在空檔位置起動(dòng)，則起動(dòng)機(jī)的瞬間動(dòng)力將使汽車(chē)位移，還可能引起交通事故和人身安全。為此介紹一種利用NXP P89LPC901單片機(jī)控制的汽車(chē)起動(dòng)保護(hù)控制器，通過(guò)檢測(cè)汽車(chē)起動(dòng)開(kāi)關(guān)、變速箱檔位、發(fā)動(dòng)機(jī)轉(zhuǎn)速，實(shí)現(xiàn)對(duì)汽車(chē)發(fā)動(dòng)機(jī)起動(dòng)過(guò)程檢測(cè)和保護(hù)。起動(dòng)保護(hù)控制器在發(fā)動(dòng)機(jī)起動(dòng)過(guò)程中通過(guò)采用逐個(gè)關(guān)閉打開(kāi)負(fù)載系統(tǒng)，解決汽車(chē)發(fā)動(dòng)機(jī)過(guò)程中因起動(dòng)電流大而對(duì)汽車(chē)電源的沖擊影響,延長(zhǎng)了電瓶壽命。
Abstract:
When the automotive engine is started, the engine start motor and flywheel gear may be damaged， even traffic accidents and personal safeties may be caused by wrong operation or other factors.In order to ensure the automotive engine can be started Normally and safely,it is necessary that the protecting measures and methods are considered in the automotive electrical control system.This paper introduces a kind of the automotive engine starting protect controller based on NXP P89LPC901 MCU.The controller can protect the engine starting process by detecting the starter key switch,transmission stall and engine speed.Through the use of close and open load system,the controller can solve the impact on automotive power because of the high-current load in the process of the automobile engine starting, and extend battery life.
標(biāo)簽：
NXP
LPC
901
P89
上傳時(shí)間：
2013-10-15
上傳用戶：mikesering
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Internal Interrupts are used to respond to asynchronous requests from a certain part of themicrocontroller that needs to be serviced. Each peripheral in the TriCore as well as theBus Control Unit, the Debug Unit, the Peripheral Control Processor (PCP) and the CPUitself can generate an Interrupt Request.So what is an external Interrupt?An external Interrupt is something alike as the internal Interrupt. The difference is that anexternal Interrupt request is caused by an external event. Normally this would be a pulseon Port0 or Port1, but it can be even a signal from the input buffer of the SSC, indicatingthat a service is requested.The User’s Manual does not explain this aspect in detail so this ApNote will explain themost common form of an external Interrupt request. This ApNote will show that there is aneasy way to react on a pulse on Port0 or Port1 and to create with this impulse an InterruptService Request. Later in the second part of the document, you can find hints on how todebounce impulses to enable the use of a simple switch as the input device.Note: You will find additional information on how to setup the Interrupt System in theApNote “First steps through the TriCore Interrupt System” (AP3222xx)1. It would gobeyond the scope of this document to explain this here, but you will find selfexplanatoryexamples later on.
標(biāo)簽：
Exter
easy
work
with
上傳時(shí)間：
2013-10-27
上傳用戶：zhangyigenius
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可在系統(tǒng)引導(dǎo)時(shí)工作的RootKit,較簡(jiǎn)單
1) It s very small.The basic framework is just about 100 lines of assembly code.It supports 2000,XP,2003
2) It patches the kernel at runtime(no files are patched on disk).(basic version has this code removed , so as others could understand it easily).
3) BOOT KIT is PXE-compatible.
4) It can even lead to first ever PXE virus
5)It also enables you to load other root kits if you have physical access(Normally root kits can only be loaded by the administrator)
標(biāo)簽：
framework
assembly
RootKit
small
上傳時(shí)間：
2014-01-02
上傳用戶：gdgzhym
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* This a software code module for a time-of-day clock object.
* The clock may be fixed 12-hour, fixed 24-hour, or dynamically
* configurable between these two types. Clock data can be accessed
* as a binary number representing the number of minutes since midnight
* or a BCD number formatted according to the time-of-day description
* in the TIME module 0404x. The functions work with time-of-day values
* which conform to Normally accepted clock values of 1:00 to
* 12:59 BCD / 0 to 719 binary for a 12-hour clock or clock values
* 00:00 to 23:59 BCD / 0 to 1439 binary for a 24-hour clock. On power-up
* the clock is 12:00 BCD / 0 binary for a 12-hour or dynamically
* configurable clock, or 00:00 BCD / 0 binary for a 24-hour clock.
標(biāo)簽：
clock
time-of-day
software
module
上傳時(shí)間：
2013-12-07
上傳用戶：llandlu
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* DEFINITION
* This a set of math functions that deal with time. The functions accept
* 4-digit time values and 4-digit time of day values. Time values are
* interpreted as hours-minutes and are valid if all digits are numeric and
* 9 or less, except the second-to-last digit must be 5 or less. Time of day
* values are valid if they conform to Normally accepted clock values of
* 1:00 to 12:59 for a 12-hour clock or 00:00 to 23:59 for a 24-hour clock.
標(biāo)簽：
functions
DEFINITION
accept
digit
上傳時(shí)間：
2014-01-15
上傳用戶：Divine
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Debugging is a fascinating topic no matter what language or platform you re using. It s the only part of software development in which engineers kick, scream at, or even throw their computers. For a Normally reticent, introverted group, this degree of emotion is extraordinary. Debugging is also the part of software development that s famous for causing you to pull all-nighter
標(biāo)簽：
fascinating
Debugging
language
platform
上傳時(shí)間：
2013-12-19
上傳用戶：xieguodong1234
