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The correct supply of water and nutrients is important in hydroponic growing systems in order to use water efﬁciently, avoid stress situations, and control production. The present study was conducted to evaluate two irrigation scheduling techniques for hydroponic tomato production in Navarra, northern Spain, related to the crop water requirements. The results show that although daily over-irrigation was applied (45.7% of drainage), 18% of the total yield (35 kg m−2 ) was affected by blossom-end rot problems, due to water stress suffered by the crop. Irrigation scheduling by time clock was not ﬂexible enough to satisfy the varying crop water requirements through the day and during the season. With constant irrigation intervals and volumes, water and fertilisers were wasted during the morning (excessive irrigation) whereas during the afternoon, the plants suffered water stress. Irrigation scheduling by radiation method at a level of 0.81 MJ m−2 , with some supplementary time clock irrigation applications during the hours of darkness (in order to keep the growing medium wet), appeared to be a good solution. Copyright 2003 John Wiley & Sons, Ltd.
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See Warranty on page 8 for important information about commercial use of this product. GPS400 Operating Instructions and Replacement Parts List Please read and save these instructions. Read carefully before attempting to assemble, install, operate or maintain the product described. Protect yourself and others by observing all safety information. Failure to comply with instructions could result in personal injury and/or property damage! Retain instructions for future reference. Description The Wayne pumps are general use centrifugal water pumps. The pump is equipped with a Viton® seal assembly that is also compatible with many agricultural chemicals. Safety Guidelines This manual contains information that is very important to know and understand. This information is provided for SAFETY and to PREVENT EQUIPMENT PROBLEMS. To help recognize this information, observe the following symbols. Danger indicates an imminently hazardous situation which, if not avoided, WILL result in death or serious injury. Warning indicates a potentially hazardous situation which, if not avoided, COULD result in death or serious injury. Caution indicates a potentially minor or moderate injury. Notic indicates important information, that if not followed, may cause damage to equipment.
Men often have male organ skin problems that are worrisome, but discussing these issues with a doctor can be difficult. To alleviate some of their anxiety, several common male issues – and how to fix them – are discussed here.
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Number of 9/11 Responders: • Responders came from all 50 states and from all but four Congressional districts. • There are an estimated 70,000 responders who served over the 9-month recovery period: Firemen, police, emergency workers, sanitation, Red Cross, Salvation Army, iron & steelworkers, engineers, truckers, clean-up workers, volunteers, etc. • The World Trade Center (WTC) Health Registry estimated in 2007 that 410,000 people were ‘heavily exposed’ to the toxins of 9/11. (Source: Addressing the Health Impacts of 9/11 Report to Mayor Bloomberg.) • 71,000 people are registered at the WTC Health Registry, of which more than 10,000 are from outside the Tri-State area (NY, NJ, CT). WTC Deaths: • 817 WTC workers have died as of September 2009. (source: WTC Responder Fatality Investigations) Number of Sick Responders: (Source: Fact Sheet: The 9/11 Health Crisis, released by the New York Congressional Delegation 9.28.08) • 16,000+ responders and 3,500 community members are currently sick and under treatment within the World Trade Center programs. (approx. 20,000 total). • 40,000+ are currently enrolled in medical monitoring. Breakdown of ‘First Wave’ Illnesses: (Source: WTC Mt. Sinai Medical Monitoring director Jacqueline Moline) • 70% of responders suffer from upper respiratory conditions. • 33% have mental health problems, including PTSD and depression.
Despite increasing levels of integration in modern electronic products, radio receiver designs continue to rely on discrete LC, ceramic, and electro-acoustic devices for the realization of RF and IF bandpass ﬁltering. Although considerable research has been directed at developing suitable switched-capacitor and Gm-C based replacements for these ﬁlters, the resulting designs have yet to see substantial commercial application. A critical problem faced by existing active ﬁlter implementations is found to be the power consumption required to simultaneously achieve narrow fractional bandwidths and acceptable dynamic range. This power consumption, which can reach several hundred milliwatts, is incompatible with portable wireless product design. Additional problems include the complexity of tuning control circuits required to achieve small fractional bandwidths, and diﬃculties in extending ﬁlter designs to higher frequencies. These problems are examined in depth, and performace bounds and new implementation techniques are considered. A detailed study of active ﬁlters reveals that their dynamic range limitations are fundamentally the result of regenerative gain associated with the realization of high-Q poles. Thus, some form of energy storage and exchange mechanism is shown to be required to decrease the regeneration needed. This leads to an investigation of on-chip LC ﬁltering. It ...
LM3089 FM Receiver IF System Y General Description The LM3089 has been designed to provide all the major functions required for modern FM IF designs of automotive high-fidelity and communications receivers Y Features Y Y Y Three stage IF amplifier limiter provides 12 mV (typ) b 3 dB limiting sensitivity Balanced product detector and audio amplifier provide 400 mV (typ) of recovered audio with distortion as low as 0 1% with proper external coil designs Y Y Four internal carrier level detectors provide delayed AGC signal to tuner IF level meter drive current and interchannel mute control AFC amplifier provides AFC current for tuner and or center tuning meters Improved operating and temperature performance especially when using high Q quadrature coils in narrow band FM communications receivers No mute circuit latchup problems A direct replacement for CA3089E Connection Diagram Dual-In-Line Package TL H 7149 – 2 Top View Order Number LM3089N See NS Package Number N16E C1995 National Semiconductor Corporation TL H 7149 RRD-B30M115 Printed in U S A LM3089 FM Receiver IF System September 1992 Toko America 1250 Feehanville Drive Mount Prospect IL 60056 (312) 297-0070 TL H 7149 – 1