2012年5月30日星期三

LED display to create three-dimensional visual impact


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The opening ceremony, the Khalifa Stadium, a large display screen on the ground and in the past extended to three-dimensional space, giving the audience a strong visual shock. This by far the largest LED display with wide up to 165m, the highest point of 39m. It consists of 20000 VersaRAY ??unit, end to end tile, up to 58km. Clever design of the lighting design FabriceKebour, AndrewDoig various elements in the opening ceremony of the ingenious combination of high-tech innovation and huge capital investments, the Doha Asian Games opening ceremony of the lighting used around the world have left a deep impression.

The installation of outdoor advertising LED display


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The installation of outdoor advertising LED display just published an LED display, spacing and line-of-sight calculation there talking about when we buy any one of the LED display, not the purpose of selection, bu t According to the demand environment, to achieve the desired effect of the environment to analyze the point spacing and line-of-sight calculation of the LED display to select an LED screen advertising, the same environment can affect the installation of outdoor LED electronic screen , and the installation will be outdoor spaces vary.

Outdoor advertising LELD display is divided into the following installation methods: embedded, hoisting, stepped, column, wall, before maintenance, etc..

Embedded: the installation of steel on the wall, and then to the steel support embedded in the outdoor advertising LED display, the main installation site is the building\\ s exterior walls.

Lifting style: The main use of designed steel, outdoor LED display screen body hanging in the structure. Will normally be on the stage, outdoor wall based on using, in the case of the temporary use of the outdoor LED display, lifting advantage.

Stepped: The main facade of the steps to install the two-color LED display full color LED display, high-density LED display column-based LED display, the viewing distance of 3 meters away there will be relatively good results. All the steps of the facade linking the playing video, it will present a very beautiful display.

 

High column: Due to the surrounding wall or use the anchor column outdoor LED display installed on the higher requirements of steel is the most common installation method. Such as the highway next to the outdoor advertising LED screen most of the column installation.

Wall-mounted: on the wall to make a point by force, outdoor LED display hanging on the wall above the wall as a fixed support.


Before the type maintenance: installation biggest feature is to maintain the replacement parts is very convenient, maintenance personnel can open directly from the front of the outdoor LED display screen body to operate.

2012年5月20日星期日

LED energy saving lamp is turned on the lamp mainstream market


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The brand of amateur energy-saving lamps are less, not more than the amateur lighting brands. In addition to the NVC and other brands, other lighting business the brand Jiannuo and stores promoted to the late start of operation, single issues, resultin g in a large part of the high-end products by Osram, Philips accounted for.
The same power to see. Wattage phase the same time, the energy efficient lights than the difficult and energy-saving lamps brighter. In fact, the difficult and energy-saving lamp life of approximately 5000 hours, indoor LED lamp life of up to 50,000 hours. In theory, electricity five hours a day contest debate, the life expectancy of up to 27 years. As a revolutionary green energy-saving lamps to LED energy-saving lamps, changing the results of the past, energy-saving lamps contain heavy metal toxins contaminated, manipulation of the much longer life expectancy and other characteristics to become the next generation of mainstream lighting product, but more expensive, few people interested.
Can decide difficult and energy-saving in straight fluorescent lamps (15W, and equal to its glow led lights (9W to perform than the force at the present, the normal cost and luminous results of different premise. A difficult and energy-saving lamps sell for about 50 yuan. The LED lamp is priced at $ 200. contest controversy, difficult and energy-saving lamps with 50,000 hours of mission hour and residents of Harbin City, electricity (0.51 yuan / kWh) electricity was 382.5 yuan, that is, (15 watts x 50000 hours) / 10000.51 Yuan = 382.5; the LED light electricity cost is 229.5 yuan, that is, (9 watts x 50000 hours) / 10000.51 yuan = 229.5 50,000 hours of testing are difficult and energy-saving lamps need to replace 10 lamps. assuming a 50 difficult and energy-saving light Conceiving a $ 25 lighting fee and a $ 25 lamp fee, then the ignition 50,000 hours costs 275 yuan (25 million x 10 tube +25 $ = 275 light 50,000 hours of LED light only 1 light, cost about 200 yuan while firing 50,000 hours are difficult and energy-saving lamps, spent a total of 657.5 yuan, LED lights compared to 429.5 yuan.
An LED light will be difficult and energy-saving lamp frugal 228 yuan. Each room with light aggregate, it is apparent. The cost of the savings will be doubled. These data tell me the performance of the LED energy-saving lamps to more winning. But the failure of the real market, in addition to price, the following factors:
Relevant government departments to ignore the extent to inadequate
Part of the government public relations and Jiannuo mission is not doing enough, many energy-saving lamp enterprises on foreign trade. Resulting in part of the Government in the hour of the introduction of related energy conservation and government purchase orders, there is no consideration of the LED energy-saving lamps out.
The embarrassed Organisation sustainable strategy of energy-saving lamp enterprises fighting each other.
R & D vision, administered by the formation of the sales force, brand implementation, operations administered by the channels promoted to the existence of higher than with the short board, many energy-saving lamp enterpri ses stay in the level of orders processed. In particular, some enterprises embarrassed Organisation to understand the objectives and positioning the ebb and flow with the industry, the future of the market alone embarrassed Organisation initiative, at any time can be eliminated.
Low market awareness of
Who used to be familiar with the current product of many lighting dealers are not very clear. Passed on expensive new products, and fear of risk. At the same time, manufacturers and media on the LED energy-saving lamps Jiannuo lessons infinite, resulting in consumers in determining the energy-saving lamps, often the LED energy-saving lamps excluded from the short list.

2012年5月18日星期五

Principles of laser cutting


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 (1) the principle of laser cutting

    Laser cutting is the use of the focusing of high power density laser beam workpiece, so that the irradiated material rapidly melting, vaporization, ablation, or to achieve ignition, with the beam coaxial high-speed airflow to blow the molten material, in order to achieve the cut workpiece opened. Laser cutting belong to one of the thermal cutting. The principle of laser cutting are shown below.

 

   (2) the classification of laser cutting

    Laser cutting can be divided into the laser vaporization, laser melt cutting, laser oxygen cutting and laser scribing and control of breaking four categories.

    1) laser vaporization

    Use of high energy density laser beam to heat the workpiece, the temperature rose rapidly to reach the boiling point of the material in a very short period of time, the material begins to vaporize, forming steam. These vapors emitted speed, while the vapor emitted, the material on the formation of the incision. Heat of vaporization of the material in general, so requires a lot of power and power density of laser vaporization.

     Laser vaporization are used for cutting thin metal material and non-metallic materials (such as paper, cloth, wood, plastic and rubber, etc.).

    2) laser melt cutting

    Laser melt cutting using laser heating to the melting of metallic materials, and then through the injection nozzle beam coaxial non-oxidizing gases (Ar, He, N, etc.) rely on the strong pressure of the gas so that liquid metal discharge, the formation of the incision. Laser melt cutting does not require the metal completely vaporized, the energy required for vaporization cutting 1/10 only.

      Laser melt cutting is mainly used for the easy oxidation of the material or activity of metal cutting, such as stainless steel, titanium, aluminum and its alloys.

     3) Laser oxygen cutting

     Laser oxygen cutting principle is similar to oxyacetylene cutting. It is as a warm-up heat source with a laser as a cutting gas, oxygen and other reactive gases. Blowing out of gas on the one hand and cutting metal effect, the occurrence of the oxidation reaction and emit a large number of oxidation heat; other molten oxides and melt blowing from the reaction zone, the formation of the incision in the metal. Generated a lot of heat due to the cutting of the oxidation process, the laser oxygen cutting the energy required to melt just cutting 1/2, while the cutting speed is much larger than the laser vaporization and melting cutting.

    Laser oxygen cutting is mainly used for carbon steel, titanium steel and heat-treated steel, easily oxidized metallic materials.

    4) laser scribing and control fracture

    The laser scribing is the use of high energy density laser scanning the surface of brittle materials, the material to heat the evaporation of a small slot, and then apply some pressure, brittle materials will split along the small groove. The laser scribing laser is generally Q-switched lasers and CO2 lasers.

     Control fracture using laser groove produced by the steep temperature distribution, local thermal stresses in brittle materials, the material along the small groove is disconnected.

 

2012年5月17日星期四

Piranha LED package is application


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The LED chip package as shown in Figure 2.17 ingestion of fish shape, this LED is very popular with users are welcome. Why this LED known as the ingestion of fish? Because of its shape like a piranha in the Amazon in. Piranha to naming a product of the LED devices is also coming from abroad.
       Piranha LED products have many advantages, Piranha LED with the stent is made of copper and larger. Therefore, heat transfer and heat quickly. LED is illuminated. The heat generated by the pn junction can quickly be exported to the by Stent four feet on the PCB s Copperbelt. This LED piranha pipe Q3 mm, the heat quickly, the Q5 mm pin-type tube which can extend the life of the device. Under normal circumstances, the thermal resistance of the Piranha LED smaller than the thermal resistance of the Q3mm, Q5mm tube half so popular with users welcome.

2012年5月14日星期一

Semiconductor wafer cutting machine


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Scribing principle
       The laser scribing the use of high-energy laser beam according to the use of high-energy laser beam in the workpiece surface, the localized melting of the irradiated region, gasification, so as to achieve the purpose of dicing. Due to the laser is a very small points of light focused by the dedicated optical system, high energy density, because of processing non-contact mechanical shock pressure on the workpiece itself, the workpiece deformation. Minimal impact on thermal, high accuracy program, widely used in solar panels, thin sheet metal cutting and dicing.

Applications
       The laser scribing machine is mainly used for the solar industry, monocrystalline silicon, polycrystalline silicon, amorphous silicon with a solar cell (cell) and silicon (wafer), dicing (cutting section) and ceramic tablets, aluminum foil etc., the workpiece fine beautiful trimming smooth. Continuous-pumped acousto-optic Q-switched Nd: YAG laser (semiconductor module) as a working light, computer-controlled two-dimensional table, do all kinds of sports according to the input graph. Output power, high precision dicing, speed, curve and the straight-line graphics can be cut.

The main features
       The semiconductor laser scribing machine series equipment, optical system uses a semiconductor laser module and import the sound of the international best light modulator, high-speed CNC X / Y table, stepper motor drives, computer-controlled precision movement, dedicated control software, the program easy to edit and modify real-time display of the trajectory. Workbench with double air positions vacuum adsorption system and bit alternating pairs of the T-type structure. The system uses the international popular modular, key components are imported products. Reasonable structure, scribing speed, high precision, full-featured, easy to operate, a 24-hour long-term continuous work together performance indicators reliable, low failure rate, high rate of finished products, the wide range of applications in the solar industry high degree of recognition of the wide range of app lications and users.

Competition in the LED lighting industry from price to aftermarket


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 With the government support measures for the gradual implementation and support efforts to continue to increase, the LED lighting industry by the "barbaric growth" stage into the stage of the game of price and quality. The docki ng of LED lighting products companies recently held a promotion conference, experts pointed out that the price of LED products are decreased rate of about 20% per year, the future of the industry competitive focus will shift to product quality and service.

    Policy levers to pry the industrial expansion

    Implemented by the Ministry of Finance National Development and Reform Commission, Ministry of Science and semiconductor lighting products financial subsidies to promote the project, completed last week to open tender. Following last year after the domestic release of the second round of subsidies for the project tender. Docking held last Friday Jinya Electronics, 3E-LED products business to promote the conference a number of industry, government plays a vital role in promoting LED products. Relevant person in charge of the China Environmental and Resources Protection and Energy Conservation Working Committee had previously disclosed, the "12th Five-Year period the government will arrange 80 billion yuan of central extra budgetary funds, to purchase four million LED efficient lighting products.

    In addition to the central government, local government support for the LED industry is sparing no effort. Binhai New Area, for example, released in 2011, the Binhai New Area to promote the development of new energy industry a number of measures to put forward, focusing on supporting the semiconductor lighting (LED) key equipment and materials and common key technologies R & D projects; support the implementation of the LED on campus in the region, the LED Green community, LED Industrial Park, LED traffic lighting demonstration project, each project in principle to give up to not more than 50 million in interest subsidies or capital grants.

    Luk Tak Wong, senior vice president of Tianjin Jinya Electronics Co., Ltd., told reporters that the support of the government subsidy policy, our current major customers are corporate procurement-based. "Our current partners include Motorola, Novo Nordisk, dozens of companies and some commercial buildings, energy-saving products throughout New Area in many places."

    LED manufacturing and purchase of corporate policies are given subsidies for lower product prices will play an important role in the industrial workshop of a 24-hour lighting, as long as three years, the energy cost savings can cover the purchase of LED lighting costs. "said Yu Ning, director of the Center of Tianjin Electric energy-saving technologies, a senior engineer.

    Benefit from the various government support, LED lighting products market will continue to maintain rapid growth. LED street lamp products, for example, the LED street lamp output in China this year will be an increase of more than 60% of the output value reached 4.7 billion yuan.

    Quality and service to enhance the competitiveness

    LED products market size continues to expand, is the price of LED products to the range of 20% per year decline. "Yu Ning told reporters more than 400 yuan, three years ago, an LED lamp, and now the prices have hit more than 50% off.

    According to statistics, the upstream chip technology upgrading and rapid price decline in downstream LED lighting products, cost-effective upgrade is fast, LED industry is a reasonable direction. LED interior lighting products production in China last year, an increase of 75 percent, prices fell by 22%; output value reached 18.6 billion yuan, an increase of 38%.

Benefit from government support prices fell this year, China s LED interior lighting output will reach 30.6 billion yuan, an increase of 64%; in 2015 will reach 99.3 billion yuan over the next four years, indoor lighting production value more than 50 percent compound annual growth rate, reaching 52 %.

    With prices falling, the LED industry is increasingly competitive. In front of the same price products, companies began to seek more energy-efficient lighting products more durable. "Once frequented by low-cost LED products in the lighting market brands less and less." An industry source told reporters that a few years ago, sales of LED lighting products for SMEs increasingly untenable with. "SMEs do not have the packaging capacity of their products is to save , can not guarantee the quality, not to mention the after-sales service."

    "After several years of incubation period, the market development of domestic energy-saving products are becoming rational, with the decline in product prices, customer focus will turn to the field of quality and service. Now more and more customers are aware, they buy in addition to product services. "insiders told reporters.

    Today, the New Area LED lighting companies to meet industry trends, with greater efforts to improve product quality and services. "In addition to the traditional after-sales service, we can provide customers with more targeted overall solution. Expensive LED products, we can also provide rental service of the product." Yellow glistening Germany told reporters.

    Investment Advisor in the Research Director Zhang Yan Lin pointed out that the LED enterprises to quality, price and balanced environment, improve service quality, technology and services are further broken down, it is more suitable for the development of the industry more competitive.

2012年5月5日星期六

Paid with Changsha decline in blood donation enthusiasm Secret voluntary blood donation


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     When the rumors dispersed in society, while the correct concept, but without the publicity, resulting in lower blood donors enthusiasm, some members of the public apathy sentiment spread

Extension, the most direct victims of clinical patients waiting for blood transfusion; deeper harm, it is the entire social welfare undertakings and voluntary action of the injured

Since July of this year, non-remunerated blood donation according to the law of public welfare undertakings, non-remunerated blood donation paid economist Lang questioned microblogging \"

Blood, red and profit from, triggered widespread concern in the relevant departments to make to explain the response to the microblogging been removed, but the resulting

Non-remunerated blood donation questioned did not stop, unpaid donors, so this is very fragile public welfare worse, and even

Much to the national emergence of the \"blood shortage.

Round and round behind the \"blood of the doubt\", the truth in the end? In recent days, reporters from the blood collection, preparation, and to the hospital and clinical use of each ring

Section a detailed understanding.

Blood of the suspect one

Non-remunerated blood donation safe

Around at 11 o\\ clock on the November 23, the reporter went to the Hunan International Economics University. Docked Changsha Blood Center in the southern part of the fifth school canteen,

A blood donation vehicles, more than 20 students in an orderly manner under the guidance of the staff participate in blood donation.

\"Students of the blood donation enthusiasm is high, the day before yesterday and yesterday, there are more than 100 offering of blood, until now, there are already more than 30 people offered

Blood. \"The staff told reporters.

Freshman girls Gong Ruifen detection area where the floor, blood samples were collected by the staff, hepatitis B, blood type, aminotransferase, hemoglobin, and other projects

The rapid detection of blood collection chair, sat down after medical clearance, the nurs e asked that she was ready to offer much blood. Been confirmed, the nurse took out a 300 ml

The specifications of the disposable blood bags, and then deftly tied pressure cuff, disinfection of the needle. A few minutes later, 300 ml of blood collection is completed. After

Nurses in blood bags and blood samples were affixed to the uniform 13 barcode. The nurse told this reporter, this bar code is the bag of blood \"body

Card, and with it, you can know that the bag of blood is when, where collected, after which several detection test results are what

End where hospitals which patients body. Offered after blood, Gong Ruifen staff received a blood donation certificate and donation souvenirs. Gong

Remifentanil offering bags of blood by the nurses carefully in the fridge.

Staff LIU group told reporters, Changs ha Blood Center is the only provincial capital Changsha, the legal blood banks, are responsible for the city of more than 140 medical

Treatment institutions of medical treatment and blood for clinical support tasks. Their blood used needles, blood bags, and all supplies have a national qualification, are

Strict sterilization of disposable medical devices, all blood donors using a special blood bags, blood collection needles are placed in a plastic sharp

Boxes, every day brought back to the blood center to do centralized medical waste harmless treatment to prevent the spread of the disease, where blood donation is very safe

.

\"I was the first time to participate in voluntary blood donation. Heard that blood donation may be the spread of AIDS, a bit worried now, I experience the

, Rest assured. Then I will come to donate blood! \"Gong Ruifen smiled and told report ers.

Some people worry that blood donation will hurt the body, debilitating, have sequelae. In this regard, Xiangya Hospital, blood transfusion, director of Libi Juan said that the right amount of

Blood donation not only will not affect health, but also healthy. Total blood volume of normal body weight about 7 percent to 8 percent, a five-to 60 kg body weight

People about the blood of 4000 ml to 4800 ml, of which 20% of the blood is stored in the liver, spleen and other organs, blood loss or strenuous exercise

These blood into the blood circulatory system. First blood donation of 300 to 400 ml, less than 10% of the systemic blood completely through the body since

Blood reservoir function of the body to adjust. Often to people who donate hematopoietic function will be more vigorous, the young red blood cells will be higher. In addition, regularly offer

Blood causes the blood viscosity is reduced, blood lipids a lso decreased, the prevention of cardiovascular disease.

Blood of the suspect 2

Blood donation gratis, why to pay for blood

Subsequently, the reporter went to Changsha Blood Center. Back after the blood collection, where inspection, preparation, storage.

To be tested in the center of the library, the reporter saw the bag of blood, blood type, blood and other information staff into the computer, to form a single storage by

Over Double check the bags of blood to the composition and Branch separation, while the corresponding blood samples from each bag of blood test sent to the Inspection Division.

At present, China Clinical infusion of blood components, patients need to supplement whatever he lose any blood components, so that not only can improve the therapeutic effect

, But also to maximize the role of the blood. Blood component machine collection and manual preparation, from the Division\\ s work b elongs to the latter, by matter

Management separation, a bag of whole blood was prepared for the red blood cells, plasma, or platelets and other blood components. Bags of whole blood \"cloned\" at the same time, with bag

Blood homologous blood samples in the test subjects to accept the hepatitis B surface antigen, hepatitis C antibody, HIV antibody, syphilis antibodies, ABO blood group, RhD anti-

Original screening, detection of the transaminase seven projects. In order to ensure accurate test results, each blood sample is divided into two by two inspectors with two

Different manufacturers of reagents for the two tests, only two results were qualified blood can enter the blood storage equipment, qualified zone classification Chu

In storage, waiting to be sent to the Clinical Hospital.

Changsha Blood Center is responsible for the person, unpaid blood donors to donate blood, did not receive any remuner ation, so the bag of blood carrying

Love is priceless. However, as the river water can not be directly gives the drink, although it is healthy to donate blood, nor to direct infusion

Patients to the hospital, the blood from the collection, testing, preparation, storage and many other areas have strict quality standards and requirements, only qualified

The blood can be sent to the Clinical Hospital. , In order to ensure that blood donation safety when a bag of blood, for example, blood, blood collection points are all \"one person, a needle,

A bag in order to ensure the activity of the cells, save the blood used in blood bags is a special \"puffy bags\", the cost of a blood bag

Almost dozens of yuan. Blood collection back to the library, do hepatitis B, syphilis screening of seven projects, in order to ensure blood safety, each bag of blood to be, respectively, with the country

Production of reag ents and imported reagents screening twice the average reagent cost of fees to nearly one hundred yuan. In addition, the instrument costs, supplies, loss of blood sub-

Away, cold chain, storage, souvenirs and so provide for the blood donors, these are also the cost of the blood.

Blood arriving at the hospital, the hospital will charge what costs? Xiangya Hospital, Central South University, Director of the Department of Blood Transfusion, Chinese Society of Blood Transfusion management

Things the Li Bijuan fees charged by the hospital blood transfusion patients, in addition to the cost of blood costs, mainly with blood fees and storage fees. Libi Juan

Hospital Blood Center for blood used in arriving at the hospital, it must first be stored. Save the need for specialized equipment, and storage

Place very high requirements. The need for blood donors and blood transfusion in patients with blood before transfusion crossmatchi ng again to determine blood type, and the blood transfusion

Blood transfusion before the four check (hepatitis B, hepatitis C, HIV, syphilis). These are the cost of blood transfusion, need to borne by blood transfusion patients.

\"Blood Donation Law of the People\\ s Republic of China\" also provides that unpaid blood donors and their spouses, immediate family members can be exempt from the fee, which is

Commonly referred to as \"blood donation, free use of blood.\" The question now is, blood banks, medical institutions nationwide information

Networking, and around the beneficial policies are not the same blood donors and their spouses, immediate family members not directly in the blood to enjoy free

Of blood, need to pay the cost of blood, with \"non-remunerated blood donation certificate, identity card, issued by medical institutions in blood that blood fat

Tickets and other evidence , to issue \"non-remunerated blood donation certificate\" blood bank for reimbursement.

Blood suspect 3

To mobilize the family members of patients to donate blood a reasonable

\"Hunan Changsha overall ischemia. Libi Juan said that last year\\ s national collection of blood in accordance with the standards of the World Health Organization projections,

Over 3.9 thousand tons, a shortfall of 1,500 tons; Hunan collecting blood from more than 150 tons last year, a gap of 50 tons; Changsha collecting blood from last year, 45 tons, 10 tons of gap

. Blood supply, some hospitals for elective surgery has repeatedly postponed. The blood shortage, the biggest victims of the blood in patients.

Compared With the growing demand of the masses on health, the widespread implementation of the health insurance policy, health care resource sharing & P

Times, demand for blood growth rate of 10% annuall y. Example, the provincial capital Changsha Changsha is the medical resources are concentrated city, every day hundreds of

Surgery need blood transfusion. Therefore, the lack of blood supply in the period, will focus on the protection of emergency, maternal critically ill patients in an emergency and special medical

With the blood of the object, the conditions of patients undergoing elective surgery, through mutual aid donation, their own blood storage, to ensure that the surgery from autologous blood transfusion, etc.

Carried out. It is understood that the mutual aid blood donation blood donation-related laws, a blood donation in the form of regulations, referring to the hospitals and doctors need to use blood

Elective surgery patients to mobilize their friends and relatives to donate blood, this is the filial piety, is also a manifestation of the love. Relatives and friends of patients in the hospital transfusion department to fi ll out the registration

Table voluntary blood donation, blood donation point to the city after confirmation by the blood bank and the deployment of qualified blood to the patient\\ s hospital. Libi Juan said, only more

The more people participate in voluntary blood donation, patients with blood will be more secure.

Blood suspected to 4

The blood bank workers rely on blood to feed?

Community, someone would say that we are \\ vampires\\ , to monopolize the lucrative industry, which is a big innocent! \"Li Jin, 1988 came to the blood

Center, who has worked here for 20 years, talk about some misconceptions about the blood bank work, feel helpless.

Blood Center financial implementation of \"expenditure\" in the hospital to allocate the cost of blood directly into the financial account workers

Wages by the full financial funding, a centralized treasury payment. The blood center a nd no account of their own funds.

Blood donation the women workers of the Services Division Peng clear three years ago, graduated from Xiangtan Vocational and Technical College nursing profession has been in the blood donation car in the blood work

. 10 blood donation cars, each car has 3-5 staff for Peng who choose non-remunerated blood donation is to choose responsibility

Responsibility, dedication. Blood safety is directly related to the people\\ s health and social stability, and they always have to tighten quality strings to ensure that each

An inquiry, every operation, every aspect not go wrong. Encountered in the blood off-season or emergencies, the center of health-age employees are

The first time to take the initiative to donate blood or donate blood to mobilize their own family. \"I come to the center in less than three years, has been offered six times in May of this year

Donation of hematopoie tic stem cells. Zheng Yang said, \"The center staff, employees donate blood in the blood center, it is generally a very common thing, an end to offer the blood we

Will return to their respective positions to continue to work. \"Although since late October 2010, more than one place of the National blood shortage, but in the blood center

The joint efforts of the staff, Changsha, the basic guarantee for the smooth and orderly blood for clinical use.