Este documento presenta los objetivos generales y específicos de mantener una base de datos para una empresa. Los objetivos generales incluyen mantener el orden y la seguridad de la información de la empresa, hacer que la información sea más accesible y reducir los riesgos de seguridad. Los objetivos específicos son crear tablas y relaciones entre archivos para organizar y vincular la información, diseñar formularios para recopilar datos de manera ordenada, e implementar informes para comunicar métricas clave de la empresa a los líderes.
Este documento presenta los objetivos generales y específicos de mantener una base de datos para una empresa. Los objetivos generales incluyen mantener el orden y la seguridad de la información de la empresa, hacer que la información sea más accesible y reducir los riesgos de seguridad. Los objetivos específicos son crear tablas y relaciones entre archivos para organizar y vincular la información, diseñar formularios para recopilar datos de manera ordenada, e implementar informes para comunicar métricas clave de la empresa a los líderes.
El documento describe el concepto de "aldea global", que se refiere a cómo la comunidad mundial se integra cada vez más debido a la innovación tecnológica. La aldea global es producida principalmente por medios de comunicación como la radio, el cine y la televisión, que transmiten información de cualquier lugar. Actualmente, la aldea global promueve la interdependencia, la solidaridad y la defensa de ideales compartidos a nivel mundial.
This document discusses several environmental certifications for products, including Sourcemap and the Eco Index. Sourcemap aims to make a product's carbon footprint understandable for consumers by researching sourcing information. The Eco Index pilot program scores individual products across their entire lifecycles, incorporating existing standards, with the goal of eventually creating a consumer-facing label. Environmental certifications overall are growing rapidly but face challenges of greenwashing and consumer education, while also providing credibility for sustainable product claims.
El documento describe el desarrollo del lenguaje en la edad preescolar. En esta etapa, los niños amplían su vocabulario más allá de solo nombres para incluir verbos, pronombres, adjetivos y conjunciones. También comienzan a comprender la estructura gramatical del lenguaje. Para el final de la etapa preescolar, los niños dominan reglas sintácticas y morfológicas y pueden analizar palabras en oraciones segmentándolas en sonidos y sílabas. Su oído fonémico se desarrolla a trav
El documento presenta un resumen de un proyecto realizado por 6 estudiantes del grado 11A sobre sistemas. El proyecto buscó analizar los sistemas de información utilizados en una empresa y proponer mejoras a dichos sistemas.
This document provides instructions for several Easter crafts for children, including: making chicks from egg cartons, decorating eggshells with tissue paper, creating Easter bonnets from paper plates, crafting bunny ears from foam and pipe cleaners, and making Easter egg suncatchers by layering tissue paper between contact paper sheets.
El documento describe el módulo de tesorería de un sistema contable, incluyendo sus objetivos de describir el módulo y sus opciones, y enumerar las funciones del módulo de bancos y opciones del módulo de caja. Explica que el módulo de tesorería integra opciones de caja como ingresos, egresos y arqueos, y opciones de bancos como cuentas ilimitadas, conciliaciones bancarias y reportes.
El documento presenta un modelo de trabajo para la investigación que enfatiza un enfoque constructivista y centrado en el proceso. Rompe con la visión tradicional del método científico al proponer cuatro preguntas clave (qué sabemos, cómo llegamos a saberlo, cómo se explica el hallazgo, qué supuestos hay detrás) y destacar la importancia de delimitar claramente el objeto de estudio. El modelo también contrasta el enfoque tradicional deductivo con uno más amplio que involucra la problematización, documentación, diseño met
This document summarizes various topics related to food resources and the impacts of agriculture. It discusses how the majority of the world's food comes from only 15 plant species and a few animal species. The major types of agriculture are described as traditional subsistence, shifting cultivation, nomadic herding, traditional intensive, plantation, and industrialized. The Green Revolution led to higher-yielding crops but also greater dependence on fossil fuels, cash economies, and introduced unintended consequences like invasive species. Environmental effects of food production include biodiversity loss, soil degradation, pollution, and impacts on human health.
El documento describe una campaña de caridad llamada "Operación Kilo" en una escuela para recolectar alimentos para personas necesitadas en la comunidad local. Explica que la situación social actual es difícil y que hay personas que pasan hambre. Anima a los estudiantes a donar un kilo de alimentos no perecederos u otros artículos esenciales para ayudar a familias durante la Navidad.
Este documento analiza qué son los códigos QR, cómo se usan y sus ventajas para los consumidores. Un código QR es un tipo de código de barras creado en 1994 que puede almacenar grandes cantidades de datos alfanuméricos. Los códigos QR se usan comúnmente para transferir información de sitios web u otros contenidos digitales mediante el escaneo con un dispositivo móvil. Proporcionan una forma sencilla de acceder a información y facilitan el traspaso de datos en diferentes ámbitos como el comercio, el entreten
no, n (%) 102 (84.3) 98 (82.4) 0.66
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Age, y 1.4 (1.6) 1.4 (1.6) 0.88 and not palpable in 37 (35.6%). The Veinlite group had a
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Anyi barrientos, paola florez y evelin goez. 10°a 19 abrilkvnprz07
El documento describe los diferentes tipos de mantenimiento de sistemas, incluyendo mantenimiento preventivo, predictivo y correctivo. El mantenimiento preventivo involucra revisiones periódicas para detectar posibles problemas, mientras que el mantenimiento predictivo evalúa el estado de los componentes para programar mantenimiento solo cuando sea necesario. El mantenimiento correctivo implica reparar o reemplazar componentes cuando se detecta una falla.
TELE-satellite is the world's largest digital TV trade magazine with a global readership of over 350,000 professionals. It was established in 1981 and is published in 20 languages. The magazine covers topics related to satellite TV, cable TV, IPTV, streaming media and other digital television technologies. It provides industry news, product reviews and reports on companies and events.
The document tests and evaluates several models of SPAUN SCR multiswitches. It finds that their performance matches the technical specifications. Signal quality at the outputs is very good, with clean signals and modulation error ratios only slightly higher than at the inputs. The multiswitches support fast channel switching. They come in different models to suit various installation needs, and allow reliable signal distribution to multiple receivers.
This document discusses high-frequency filters and their benefits. It provides examples of how different types of filters work, including high-pass filters, low-pass filters, band-pass filters, and band-rejection filters. It also describes common applications of these filters, such as eliminating interference, providing separate frequency bands to different receivers, and preventing certain customers from accessing premium cable channels. Key parameters for filters are also defined, including attenuation, bandwidth, cut-off frequency, and insertion loss.
1) The document tests and reviews the Icecrypt S3700CHD triple tuner PVR HD receiver.
2) It finds that the receiver has a fast new generation CPU, supports recording two channels while watching a third, and motor settings can be copied between satellites.
3) Testing showed the receiver found over 1700 TV channels and 400 radio channels in a blind scan of HOTBIRD, but does not support the newer DVB-T2 standard for terrestrial reception.
GlobalInvacom's fibre optic integrated reception system (FibreIRS) has connected over 2 million homes in the past 5 years since its introduction. The system transmits satellite signals through fibre optic cables, allowing signals to travel farther and connect to more receivers than traditional coaxial cables. GlobalInvacom continues developing new FibreIRS products, recently introducing a system that can connect up to 4,096 homes from one satellite dish. The company has also expanded into transmitting terrestrial TV signals and sees growing markets in Europe, the Middle East, and Southeast Asia.
The document describes how to set up a homemade IPTV system using a Raspberry Pi and TSReader Pro software. Key points:
1. A Raspberry Pi is used as the IPTV receiver due to its low cost and small size. It can turn any TV into a media center when running XBMC software.
2. TSReader Pro software is used on a PC to receive TV channels and stream them individually over the network via multicast to the Raspberry Pi.
3. An M3U playlist file lists the streamed channels and their IP addresses and ports so that XBMC on the Raspberry Pi can display the channel guide and allow channel surfing.
The proposed extensions to the DVB-S2 satellite communication standard aim to increase data rates and spectral efficiency. This includes reducing transponder roll-off factors and side lobes to allow transponders to be placed closer together, utilizing spectrum more efficiently. A new 64-APSK modulation scheme and additional modulation and coding options provide flexibility to optimize throughput. Wideband transponders using the full 72 MHz bandwidth could increase efficiency threefold over traditional 27.5 MHz transponders. These extensions may provide up to 20% higher data rates for direct broadcast applications and up to 64% for professional point-to-point links. The improvements will help enable services like ultra-high definition television that require high data throughput via satellite.
ELNET is a leading digital TV wholesaler and retailer in Iceland. It offers a wide range of digital TV products from small DVB meters to large DVB transmitters at its 600 square meter facility. Asmundur Einarsson, the general manager, says they must carry a broad product selection due to Iceland's small population of 300,000 spread across a large geographic area. The company was established in 1982 and involved in Iceland's digital terrestrial TV rollout, supplying around half of the country's transmitters. While satellite dishes remain popular sellers, ELNET expects growing demand for fiber optic distribution systems in coming years as their price difference with coax systems narrows.
The document provides a two-part test report on the Deviser S7000 multi-norm digital TV signal analyzer:
1. In Part 1, the analyzer's functions are introduced, including real-time spectrum analysis, remote control via PC/mobile, and suitability for MPEG2 and MPEG4.
2. Part 2 details testing results, finding measurement values very similar to five reference analyzers. Alignment of a motorized antenna using waterfall diagrams is demonstrated to be easy.
3. Troubleshooting interference in a CATV distribution is described, identifying a faulty splitter easily using the S7000's analog transponder analysis.
The Brazilian digital TV Internet forum BSD has been in operation for 10 years and sees 400,000 visitors monthly. Forum founder Marcos Benni has established a new office and plans to launch an online store called bsdshop.com.br featuring product demonstration videos. Benni will offer satellite dishes, LNBs, receivers and related equipment. In addition to his online business, Benni maintains the forum as a major information resource on digital TV in Brazil and operates satellite dishes from his office to test channels.
The Amiko Mini HD is a compact DVB-S2 HDTV receiver measuring only 15 x 11 x 3.5 cm. It has every feature of larger receivers, including a USB port for PVR recording, integrated network features like YouTube and Google Maps, and HDMI output up to 1080p. The receiver can automatically detect satellite signals and programs. It has a well-organized interface and supports various video and audio formats for playback. While it has some limitations, the Amiko Mini HD provides full PVR functionality in a small package.
1. The document tests and reviews the AB IPBox Prismcube Ruby, a new HDTV PVR satellite receiver with a media center built around the Xbox Media Center operating system.
2. It has a variety of features including support for multiple satellite and Internet TV standards, integrated DiSEqC protocols, customizable menus in 51 languages, and compatibility with digital television.
3. The receiver performed well in tests, with a channel scan completing in under five minutes and finding over 1700 channels, and strong signal reception from satellites across Europe and the Middle East.
The document summarizes a test signal generator called the Handheld Satcom Test Source produced by WORK Microwave. It can generate signals from 50-180 MHz and 950-2150 MHz with precision, making it suitable for calibrating test equipment and measuring parameters of high-frequency converters. The generator has two independent synthesizers allowing it to supply two signals simultaneously for measuring intermodulation. It also allows flexible setting of output levels for measurements like compression point and conversion gain. The generator includes rechargeable batteries, software control, and integrates smoothly with Windows operating systems.
This document is the September-October 2013 issue of TELE-audiovision International magazine. It includes summaries of signal analyzers, satellite receivers, amplifiers and other digital television equipment. It also provides reports on companies in the digital TV industry and summaries of recent industry events and technology trends. TELE-audiovision is the world's largest digital television trade magazine with over 350,000 readers globally.
Speedcast is a large satellite uplink system operator located in Barueri, São Paulo, Brazil. It operates seven large satellite dishes and provides uplink services for major Brazilian television channels. Speedcast was the first company to provide high definition television uplink services in Brazil in 2008. It currently employs 34 people and has established itself as a leader in the television uplink field in Brazil over the past 10 years.
The SPAUN SUS 5581/33 NF LEGACY and SUS 5581 F SCR multiswitches were tested and found to perform excellently. They allow distributing satellite signals from a quad LNB to over 16 receivers via a single coaxial cable without additional cables. Measurements showed output power and signal quality were maintained within specifications, even when signals passed through both multiswitches in series. Channel zapping was also faster than most receivers. The SPAUN multiswitches provide a flexible and easy way to add satellite TV to an existing small cable network.
Öreind is a digital TV wholesaler located in Kopavogur, Iceland that has been in business for 25 years. It was founded by two partners, Baldur Sveinsson and Sigurour Gunnarsson, who began by importing satellite components from Europe and installing satellite reception systems. Öreind now generates 40% of its revenue from satellite components, 10% from terrestrial antennas, 20% from repairs, and 30% from IPTV components as it looks to expand in this area of the market. The company remains focused on providing installation materials and servicing for satellite TV, terrestrial, and emerging IPTV systems to customers in Iceland.
1. The MKTech IS1-19HD is a hybrid satellite and terrestrial PVR receiver that supports both DVB-S2 and ISDB-T.
2. It has a removable hard drive frame, fast channel changing, robust software, and strong support for networked features after connecting to the internet via ethernet or included WiFi dongle.
3. While the review praised most aspects of the receiver, it noted that the WiFi connection does not allow manual input of the SSID for hidden networks.
1. The document tests and reviews the Horizon HD-CM+ signal meter for DVB-C networks.
2. It finds the meter to be very easy to use, with a clear display and intuitive menu navigation. It also includes many useful accessories and allows custom channel allocation plans to be downloaded.
3. Testing showed the meter provided accurate measurements of signal levels, MER and BER that closely matched the readings from another professional signal meter.
Ultra high definition television (UHDTV) provides significantly higher resolution than HDTV through two standards - 4K UHDTV which doubles the resolution of HDTV, and 8K UHDTV which quadruples the resolution. UHDTV also improves on HDTV by allowing wider color gamuts and higher frame rates up to 120 frames per second. However, UHDTV requires much greater bandwidth for transmission and most current infrastructure and devices are not compatible with UHDTV standards. While the technology and standards are still in development, UHDTV is expected to eventually become mainstream as the new standard for television.
1. TEST REPORT 卫星信号测试分析仪
Promax TV 电视探测者 II+ 06-07/2008
世界顶级的信号分析仪 PROMAX TV EXPLORER II+
Promax at its best! A must for satellite
professionals; ergonomic and
universally usable with sun-proof display
20 TELE-satellite & Broadband — 06-07/2008 — www.TELE-satellite.com
6. ???
TELE-satellite World www.TELE-satellite.com/...
Download this report in other languages from the Internet:
Arabic ﺍﻟﻌﺮﺑﻴﺔ www.TELE-satellite.com/TELE-satellite-0807/ara/promax.pdf
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Български www.TELE-satellite.com/TELE-satellite-0807/bul/promax.pdf
What do all
Bulgarian
Czech Česky www.TELE-satellite.com/TELE-satellite-0807/ces/promax.pdf
German Deutsch www.TELE-satellite.com/TELE-satellite-0807/deu/promax.pdf
English English www.TELE-satellite.com/TELE-satellite-0807/eng/promax.pdf
Spanish Español www.TELE-satellite.com/TELE-satellite-0807/esp/promax.pdf
these acronyms
Farsi ﻓﺎﺭﺳﻲ www.TELE-satellite.com/TELE-satellite-0807/far/promax.pdf
French Français www.TELE-satellite.com/TELE-satellite-0807/fra/promax.pdf
Greek Ελληνικά www.TELE-satellite.com/TELE-satellite-0807/hel/promax.pdf
Croatian Hrvatski www.TELE-satellite.com/TELE-satellite-0807/hrv/promax.pdf
mean?
Italian Italiano www.TELE-satellite.com/TELE-satellite-0807/ita/promax.pdf
Hungarian Magyar www.TELE-satellite.com/TELE-satellite-0807/mag/promax.pdf
Mandarin 中文 www.TELE-satellite.com/TELE-satellite-0807/man/promax.pdf
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Polish Polski www.TELE-satellite.com/TELE-satellite-0807/pol/promax.pdf
Portuguese Português www.TELE-satellite.com/TELE-satellite-0807/por/promax.pdf
Romanian Românesc www.TELE-satellite.com/TELE-satellite-0807/rom/promax.pdf QPSK ― phase modulation used in DVB-S and DVB-S2
Russian Русский www.TELE-satellite.com/TELE-satellite-0807/rus/promax.pdf transmissions. 4 phase angles are used.
Swedish Svenska www.TELE-satellite.com/TELE-satellite-0807/sve/promax.pdf
Turkish Türkçe www.TELE-satellite.com/TELE-satellite-0807/tur/promax.pdf
8PSK ― phase modulation used in DVB-S2 transmissions.
8 phase angles are used. If used instead of QPSK, more data
can be sent in the same bandwidth.
专家结论
QAM ― phase/amplitude modulation used in DVB-C trans-
+ mission. Different number of phase angles and amplitude
电视探险家 2+ 是一台令人惊奇、 用途广泛、人机互动友好 levels are used depending on the mode: 16QAM, 32QAM,
的专业设备。 它特别适合用于建立、 维护卫星接收站/地面天 64QAM, 128QAM or 256QAM.
线及其信号传输网络。 它也是一台功能足够齐全、 用于检测模
拟或数字有线电视网络的仪器。 它能甚至可以用来检查 FM 广 COFDM ― complex modulation used in DVB-T optimized to
播或 DVB-H 的信号! 它的 TFT 液晶显示屏即使在在明亮的 Jacek Pawlowski be insensitive to the interference typical for terrestrial TV.
TELE-satellite
日光下也易于读取。 Test Center
Poland
L-Band ― frequency range 950-2150 MHz to which all sat-
ellite signals are converted to by an LNB (Ku-, C- or S-band).
- This frequency range is used to transmit satellite signals
没有。 via a cable from an LNB to a satellite meter and/or satellite
receiver.
TECHNIC MPEG-2 ― the older compression method used for digital
video in DVB. Still widely used for standard definition chan-
DATA
nels.
Manufacturer PROMAX Electronica S. A., C/ Francesc Moragas, 71,
08907 L’Hospitalet de Llobregat, SPAIN
MPEG-4 ― the newer more efficient compression method
Tel +34-932-602-000
for digital video in DVB-S2 and DVB-T/H.
Website www.promax.es
Email promax@promax.es C/N ― carrier-to-noise ratio expressed in dB. One of the
Model Promax TV Explorer II+ basic terms used to assess signal quality. The higher the C/N,
the better the signal. In practice, it is difficult to measure it
Function Universal Satellite Signal Meter and Analyzer
correctly because it is not possible to switch the transponder
Type of signals processed Analog TV terrestrial/cable and satellite, DVB-S, off and measure only the noise. The meter tries to find a noise
DVB-S2, DVB-C, DVB-T, DVB-H, FM Radio
level next to the transponder signal and uses it as a refer-
TV systems PAL, SECAM, NTSC ence. The readings may be too pessimistic.
TV standards M, N, B, G, I, D, K and L
BER ― bit error rate: a measure of digital signal quality
Tuning range 5 to 1000 MHz (terrestrial) and 950 to 2150 MHz (satellite)
telling us how often we have a false bit in an incoming data
Measured parameters Power, CBER, VBER, MER, C/N and Noise Margin
stream. Thus, 3x10-4 means that in 10,000 bits we have 3
for DVB-S (QPSK)
false bits (0’s instead of 1’s or vice versa). The lower the BER
Measured parameters Power, CBER, LBER, MER, C/N and Wrong Packets the better. For example, 4x10-5 is better than 1x10-4.
for DVB-S2 (QPSK/8PSK)
Constellation diagram DVB-T/H, DVB-C, DVB-S, DVB-S2 CBER ― channel BER. Bit error rate before the forward
available for: error correction technique is used.
DVB-S signal range 44 dBµV to 114 dBµV, 2 to 45 Ms/sec
DVB-S2 signal range 44 dBµV to 114 dBµV, 2 to 33 Ms/sec (QPSK)
VBER ― Viterbi BER. Bit error rate after the Viterbi forward
and 2 to 30 Ms/sec (8PSK) error correction technique has been applied. VBER is always
much better (lower) than CBER. Signals with a VBER = 1x10-4
Spectrum Analyzer Input: 30 dBµV to 130 dBµV
are regarded as Quasi Error Free (QEF). It is marked on the
(satellite range) Span: Full – 500 – 200 – 100 – 50 – 32 – 16 MHz selectable
bar indicator scale when the TV Explorer II+ is in VBER meas-
Monitor transflective TFT 6.5 “
uring mode.
Aspect ratio 16:9, 4:3, Auto
External units powers 5/13/15/18/24 V, 22 kHz: 0.65 ± 0.25 V LBER ― BER after Low Density Parity Check. This is an
supply (e.g. LNB) equivalent of VBER for DVB-S2 signals.
Internal power supply 7.2V 11 Ah Li-ion Battery
4.5 hours of continuous operation MER ― modulation error ratio. The relation between the
average power of a DVB signal and the average power of noise
Recharging time 3 hours to 80%
present in the constellation of a signal. It is “a digital equiva-
External power supply 12 V, 30 W lent of signal-to-noise” ratio in analog transmissions. So, the
Operating temperature 5 to 40° C higher the MER the better (like C/N). The TV Explorer II+
Humidity 80% (up to 31° C) decreasing linearly to 50% at 40° C also shows the noise margin (in dB) when in MER measure-
ment mode. We should have at least a 3 dB noise margin to
Dimensions 230 x 161 x 76 mm
ensure good reception even in bad weather conditions.
Weight 2.2 kg
26 TELE-satellite & Broadband — 06-07/2008 — www.TELE-satellite.com