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Currently, the information and communications technology (ICT) industry sector
accounts for about 2–6% of the energy Consumption worldwide, and a significant por-
tion of this is contributed by the wireless and mobile communications industry. With
the proliferation of wireless data applications, wireless technology continues to increase
worldwide at an unprecedented growth rate. This has resulted in an increased number
of installed base stations and higher demand on power grids and device power usage,
causing an increased carbon footprint worldwide.
標(biāo)簽：
Communication
Networks
Green
Radio
上傳時間：
2020-05-27
上傳用戶：shancjb
-
The growth of mobile technologies is remarkable. At a recent Mobile World Congress Conference, Eric
Schmidt, CEO of Google predicted that within three years, smart phones will surpass Personal Com-
puter sales. The number of mobile phones used worldwide has exceeded 4.6 billion with continued
growth expected in the future. In fact, in the United States alone, the numbers of mobile phone users
comprise over 80% of the population.
標(biāo)簽：
Opportunities
Consumption
Technology
Mobile
上傳時間：
2020-05-30
上傳用戶：shancjb
-
Smartphones have become a key element in providing greater user access to the
mobile Internet. Many complex applications which used to be limited to PCs, have
been developed and operated on smartphones. These applications extend the
functionalities of smartphones, making them more convenient for users to be
connected. However, they also greatly increase the power Consumption of
smartphones, making users frustrated with long delays in Web browsing.
標(biāo)簽：
Browsing
Mobile
Cloud
Using
Web
the
上傳時間：
2020-05-30
上傳用戶：shancjb
-
This book focuses on the study and development of one of the most
advanced topics in broadband wireless communications systems:
power efficiency and power Consumption in wireless communications
systems, especially of mobile devices. Hence, the main focus of this
book is on the most recent techniques for the conservation of power
and increase in power efficiency.
標(biāo)簽：
Communications
Efficiency
Broadband
Power
in
上傳時間：
2020-05-31
上傳用戶：shancjb
-
The single-carrier frequency division multiple access (SC-FDMA)
system is a well-known system that has recently become a preferred
choice for mobile uplink channels. This is attributed to its advantages
such as the low peak-to-average power ratio (PAPR) and the use of
frequency domain equalizers. Low PAPR allows the system to relax
the specifications of linearity in the power amplifier of the mobile
terminal, which reduces cost and power Consumption.
標(biāo)簽：
Communications
SC-FDMA
Mobile
for
上傳時間：
2020-06-01
上傳用戶：shancjb
-
Ultra-wideband (UWB) technology enables high data-rate short-range communica-
tion, in excess of hundredmegabit-per-secondsand up to multi-gigabit-per-seconds,
over a wide spectrum of frequencies, while keeping power Consumption at low lev-
els. This low power operation results in a less-interfering co-existence with other
existed communication technologies (e.g., UNII bands).
In addition to carrying a huge amount of data over a distance of up to 230 feet
at very low power (less than 0.5mW), the UWB signal has the ability to penetrate
through the doors and other obstacles that tend to reflect signals at more limited
bandwidths and higher power densities.
標(biāo)簽：
Silicon-Based
Front-Ends
RF
上傳時間：
2020-06-01
上傳用戶：shancjb
-
The author of this textbook intends to consider all stages of the life cycle of the
energy resources: extraction of mineral energy resources and mastering for power
engineering renewable energy, transportation of mineral energy raw materials to the
place of Consumption, the conversion of primary energy sources into electrical
and/or thermal energy, transportation and distribution among the customers, and
energy storage (if necessary).
標(biāo)簽：
Engineering
Electrical
Current
Power
State
上傳時間：
2020-06-07
上傳用戶：shancjb
-
With the proliferation of cloud computing and Internet online services, more and
more data and computation are migrated to geographical distributed Internet data
centers (IDCs), which can provide reliability, management, and cost benefits.
However, IDC operators encounter several major problems in IDC operations, such
as huge energy Consumption and energy cost, and high carbon emission. To deal
with the above problems, IDC operators have to efficiently manage the way of
energy Consumption and energy supply. Considering the potential of smart grid, we
focus on the energy management of IDCs in smart grid from several perspectives,
i.e., power outage, carbon emission, heterogeneous service delay guarantees, and
operation risk.
標(biāo)簽：
Internet
Centers
Data
上傳時間：
2020-06-07
上傳用戶：shancjb
-
stract
With global drivers such as better energy
Consumption, energy efficiency and reduction of
greenhouse gases, CO 2 emission reduction has become
key in every layer of the value chain. Power Electronics
has definitely a role to play in these thrilling challenges.
From converters down to compound semiconductors,
innovation is leading to breakthrough technologies. Wide
BandGap, Power Module Packaging, growth of Electric
Vehicle market will game change the overall power
electronic industry and supply chain. In this presentation
we will review power electronics trends, from
technologies to markets.
標(biāo)簽：
Electronics
Materials
Power
WBG
for
上傳時間：
2020-06-07
上傳用戶：shancjb
-
在傳統(tǒng)智能小車驅(qū)動電路設(shè)計中,較多考慮使用直流電機(jī)還是步進(jìn)電機(jī),電機(jī)功率、能耗等性能參數(shù)。使用具有armCortexM4內(nèi)核的STM32嵌入式平臺控制四輪的4個直流電機(jī)。文章基于PWM技術(shù)及PID算法,對四輪進(jìn)行精準(zhǔn)地速度、轉(zhuǎn)向及啟停控制,實驗表明此小車具有優(yōu)越各種地形適應(yīng)能力。In the traditional intelligent car drive circuit design,DC motor or stepping motor,motor power,energy Consumption and other performance parameters are considered.The four DC motors with four wheels are controlled by STM32 embedded platform with arm Cortex M4 kernel.Based on the PWM technology and PID algorithm,the accurate ground speed,steering,and start-stop control of the four wheels are carried out.The experiment shows that the vehicle has the superior adaptability to all kinds of terrains.
標(biāo)簽：
stm32
智能小車
控制系統(tǒng)
上傳時間：
2022-04-02
上傳用戶：
