In the United States, genetically modified crops are taking off myths. American scientists say that genetically modified crops are not as beautiful as they were originally thought of, and that there is no such thing as a GMO company promises. The report of the National Academy of Sciences uses 16 years of practical facts and statistical data to make it clear that the long-term cultivation of genetically modified crops will bring unrecoverable side effects to the agricultural economy. (July 6th International Herald Leader)
When the GM research in the United States began to change from "challenging nature" to "respecting nature," our GM crops are now leaping on the blaring commercial avenue: in August 2009, the Ministry of Agriculture included two countries including BT rice. A biosafety certificate was issued for a variety of genetically modified rice and a genetically modified corn, which opened the "gate" for the commercial cultivation of genetically modified food crops in China. This is considered to have "significant significance" in the history of the world.
The history of planting genetically modified crops for more than a decade has brought nothing but two lessons to the United States. First, in addition to super weeds, super insects have also appeared in genetically modified farmland, the cost of fuel for agricultural operations has more than doubled, and the amount of pesticides used has exceeded. With the planting of natural crops, the cost of seeds has also increased dramatically. Second, in May 2009, the report by the American Academy of Environmental Medicine Sciences caused a sensation. The report strongly recommends that GM foods pose a serious safety threat to patients and call on members to avoid doctors. Let their patients eat genetically modified foods and educate their communities to avoid eating genetically modified foods.
It is true that as a national strategy, we cannot put people behind GM technology. The commercialization of GM technology is also an irresistible trend. However, as Mr. Yuan Longping said, “The government should give special consideration to the commercialization of genetically modified plants. Scientists It is impossible to fully predict the genetic modification of organisms, which may lead to mutations that cause harm to the environment and people." In fact, major scientific experiments related to human life and health, in addition to mice, there must be human clinical trials, the problem is that even if some experts claim to be "completely safe" genetically modified foods, they may not be willing to eat for a long time and verify its safety. Scientific attitudes, at least, should be grouped with experts strongly pushing for GM crops, and provide accurate data for the world to prove the safety of genetically modified foods—at this time, it should be at least two generations.
There is a common sense that we need to keep in mind: GM technology experts have never been GM security experts. In other words, these are two concepts. If the genetically modified papaya or tomato is also a fruit and vegetable with a relatively large elasticity of demand, then transgenic rice is the staple food that we have no choice. The Greenpeace Food and Agricultural Project Organization has raised many questions about the “entry permit†for genetically modified crops in China. For example, why experts from the GMO safety committee, experts on environment and food safety were not involved in discussions, and whether they would consult other stakeholders? And so, unfortunately, we seem to maintain an overly optimistic attitude toward these naturally competitive species, too lazy to respond to relevant questions.
What can genetic modification change? This question may be difficult to answer for a moment, but one thing is certain: Genetic modification will certainly change anything. However, history is not a science fiction film. There is no time machine to reverse the re-election. The United States' practice of genetic modification can be described as a lesson - especially with regard to issues related to food safety and ecological health, we may not always be so naively optimistic and fearless. (Deng Haijian)
Elevator modernization (or lift modernisation) is the process of upgrading the critical parts of the elevator in order for it to be able to handle new technology, have better performance, improve safety, and even give the aesthetics an up-to-date appeal
Most elevators are built to provide about 20 years of service, as long as service intervals specified and periodic maintenance/inspections by the manufacturer are followed. As the elevator ages and equipment become increasingly difficult to find or replace, along with code changes and deteriorating ride performance, a complete overhaul of the elevator may be suggested to the building owners.
A typical modernization consists of controller equipment, electrical wiring and buttons, position indicators and direction arrows, hoist machines and motors (including door operators), and sometimes door hanger tracks. Rarely are car slings, rails, or other heavy structures changed. The cost of an elevator modernization can range greatly depending on which type of equipment is to be installed.
Modernization can greatly improve operational reliability by replacing mechanical relays and contacts with solid-state electronics. Ride quality can be improved by replacing motor-generator-based drive designs with Variable-Voltage, Variable Frequency (VVVF) drives, providing near-seamless acceleration and deceleration. Passenger safety is also improved by updating systems and equipment to conform to current codes.
Components needs to be replaced in different elevator modernization plan
| Component | Scheme of elevator modernization plan | |||
|---|---|---|---|---|
| Refurbishment work | Partial modernization | Full modernization | Full replacement | |
| Elevator car | ||||
| Sling | No | No | by building owners | Yes |
| Door operator | No | by building owners | Yes | Yes |
| Cab design | by building owners | by building owners | Yes | Yes |
| Car doors | by building owners | by building owners | Yes | Yes |
| Car fixtures | Yes | by building owners | Yes | Yes |
| Wedges connected to the governor | No | No | Yes | Yes |
| Additional phone/intercom if they don't equipped | by building owners | Yes | Yes | Yes |
| Traveling cable | No | Yes | Yes | Yes |
| Hydraulic rams | No | No | No | Yes |
| Wire ropes | No | by building owners | Yes | Yes |
| Shaft | ||||
| Counterweight | No | No | No | Yes |
| Guide rails | No | No | No | Yes |
| Buffers | No | No | Yes | Yes |
| Electrical components | No | No | No | Yes |
| Tapehead | No | Yes | Yes | Yes |
| Limit switches | No | Yes | Yes | Yes |
| Wiring | No | Yes | Yes | Yes |
| Compensations | No | No | No | Yes |
| Lobby | ||||
| Shaft door components | by building owners | by building owners | Yes | Yes |
| Shaft doors | by building owners | by building owners | by building owners | Yes |
| Hall fixtures | Yes | by building owners | Yes | Yes |
| Machine room | ||||
| Machines | No | by building owners | Yes | Yes |
| Controllers | No | Yes | Yes | Yes |
| Removal of the selector | by building owners | Yes | Yes | Yes |
| Overspeed governor | No | No | Yes | Yes |
| Additional unintended car movement protection device if they don't equipped | by building owners | by elevator safety code in countries | ||
| Backup battery or uninterruptible power supply | No | Yes | Yes | Yes |
Benefits of elevator modernization
Modernization can greatly improve operational reliability by replacing mechanical relays and contacts with solid-state electronics. Ride quality can be improved by replacing motor-generator-based drive designs with Variable-Voltage, Variable Frequency (VVVF) drives, providing near-seamless acceleration and deceleration. Passenger safety is also improved by updating systems and equipment (such as double brake system, unintended car movement protection device on the brake system etc.) to conform to current codes.
With CEP traction elevator modernization, we use the existing elevator structure while upgrading the ride quality and reliability with state-of-the-art components. Upgrade to a CEP closed loop door operator or a sophisticated, energy saving VVVF inverter.
CEP traction elevator modernization can include:
- CEP Microprocessor Based Control System
- CEP Microprocessor Based Efficient Dispatch System
- Energy Efficient AC Drives or SCR Drives on Existing AC Gearless Machines
- Traction Machines (Geared / Gearless)
- Rope Brake System
- CEP Closed Loop Door Operating System
- Car & Hall Pushbutton Fixtures & Indicators
- Car & Counterweight Roller Guides
- Seismic Upgrades
- Security Upgrades
- Cab Interior Renovations or Cab Replacement
NOTE: Complete tear-out modernizations are available.
Contact us TODAY for Right Modernization Package Available
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Elevator Modernization,Lift Modernisation,Passenger Lift Modernization,Passenger Elevator Modernization
CEP Elevator Products ( China ) Co., Ltd. , https://www.zjsmartcommercialescalators.com