Of course, the advantages outweigh the disadvantages; The reasons are shown in many aspects: from the medical point of view, the emergence of various modern technologies and laser surgery have saved many people's lives; Astronomy: the invention of artificial earth satellites and spaceships, such as meteorological satellites, can accurately predict the weather changes in the future, which provides convenience for human production and life; From the aspect of human life: various electrical appliances make people's lives comfortable, such as air conditioning, which is warm in winter and cool in summer. Of course, the progress of science is inevitably accompanied by negative effects, but the positive side accounts for the vast majority after all.
from the internet, there are people who surf the internet; With people surfing the internet, some people say the advantages and disadvantages of surfing the internet. Today, as a college student, what do I think of college students surfing the Internet? I think it should be seen in two.
The network was originally used in enterprises, to look up the information needed by the company and also to negotiate business. At this time, the network has not been popularized, but its role is positive. At this time, the network is not perfect, but I don't think there are any advantages and disadvantages.
with the improvement of technology, the network is becoming more and more perfect and popular. In order to better meet the needs of the public, there are online games, QQ and various sections. As a result, more people surf the Internet, including college students. There are various reasons for college students to surf the Internet. Some pass the time by looking for a net friend; Some stay up all night for online games; Some people "enrich" their lives for online movies. Of course, there are also for learning. I heard with my own eyes that an architecture student had to stay up for two nights to draw pictures. Let's not talk about whether his behavior of staying up all night is improper or not, but only about his use of the internet. He is using the internet. I have to interject, what is "utilization"? I think, here, use is not a derogatory term, but a positive and effective use. Today, with the development of science and technology, with the help of computers and the use of the internet, many things that could not or were not easy to do in the past can be done. This is Leigh? Is it a disadvantage?
As a student of tourism, I often surf the Internet. On the internet, you can see a lot of information about tourism. There are introductions of scenic spots, the release of tourism information and the announcement of national tourism policies. These can be said to be the latest and fastest. For a sensitive industry like tourism, getting information earlier means seizing opportunities earlier. This is Leigh? Is it a disadvantage? Of course, the internet is not all reliable information, but also rumors and fallacies. If we don't distinguish them, we will all adopt them and accept them, which will lead to great mistakes. Is this profit again? Still a disadvantage?
The Internet extends in all directions. You can meet many people when you get online. Local, foreign, China, foreign, of course, there will be good people and bad people. Get online, have netizens, exchange needed goods, contact each other, provide each other's opinions and suggestions, and establish a good online friendship. This is Leigh? Still a disadvantage? Indulge in online chatting all day, don't attend classes, do nothing, just surf the internet, and talk with people at the other end of the network for a long time, and finally may go astray. This is Leigh? Is it a disadvantage?
Everyone says that the Internet is wonderful, and it can present what you want to know in an instant. You can search for an old magazine that you have been looking for but can't find; You can search for some cutting-edge knowledge that has not appeared in books and newspapers. You can use it to enrich yourself, truly reach a state of knowing what's going on in the world without going out, and reach a state of knowing cutting-edge science with one computer. This is Leigh? Still a disadvantage? There are also such people who have excellent network knowledge and use the internet to make a fortune, which is an ill-gotten gain. Of course, the use here is not the use I mentioned earlier, it is also a kind of use, but it is a destructive use. So it's good? Is it a disadvantage?
Actually, the Internet has no advantages and disadvantages, but the advantages and disadvantages lie in the people who surf the Internet. After learning Ma Zhe, I know that people should play their own initiative, and so should surfing the Internet. Sometimes, the advantages and disadvantages are only separated by a thin line. Just look at how people who surf the Internet grasp it and how they play their own initiative.
Nowadays, it is a trend for college students to surf the Internet, which can also be said to be an inevitable situation. The pros and cons are still said, but how to grasp the pros and cons is not in your own hands?
Advantages and disadvantages of scientific and technological development
Conclusion: The development of science and technology is important, but it can't be developed on the premise of reasonable and normal use. The development must first purify the mind. Only when no one's mind and soul are developed and improved, the developed high-tech can be beneficial to human development and natural harmony forever!
Disadvantages: As mentioned above, each of us has a higher and farther vision, which makes us see what is higher in the distance, explore and pursue, and ignore what we should do in front of us. Just like some monarchs in history who want to live forever, drugs are used to treat diseases, and as a result, they blindly invest in something impossible, and as a result, they harm themselves and the people, and there is a macro that people now see in movies. For example, if every
technological development brings convenience to people, it also brings disaster. Leon: We can go where we want to go. People are constantly exploring, and in the future, the association of Sun Center may be overthrown. With the development of science and technology, no one can enjoy what those historical figures can't enjoy. With the development of economy, the acceleration of people's living pace and the improvement of living standards, the amount of plastic used by each newcomer is increasing day by day. In 1996, the consumption of plastic packaging in China reached 2.43 million tons, with an average annual growth rate of more than < P > 21%, especially in the garbage of cities, major traffic routes and tourist attractions.
According to the survey, the annual output of domestic waste in Beijing has reached 3 million tons, of which waste plastics account for about 3%, with an annual growth rate of
48%. The plastic content of garbage in coastal cities is higher, reaching 8-11%. The waste
plastics account for more than one-third of the garbage by volume, which greatly increases the difficulty and cost of
garbage disposal.
Because waste plastics are difficult to degrade for hundreds of years, if discarded in the natural environment, it will provide a breeding ground for mosquitoes, flies and
bacteria. If buried underground, it will easily pollute groundwater, hinder the growth of plant root system, destroy soil quality and affect crop harvest; If it is incinerated by fire, a variety of poisonous gases < P > will be produced. "White pollution" has become a major public hazard that harms China's social environment and seriously hinders the sustainable development of China's economy and environment.
At present, the annual consumption of disposable tableware in China is about 11 billion, mainly foamed plastic products. To stop the production, sale and use of these large-scale disposable foamed plastic tableware, it is necessary to develop and produce its substitute products, and green disposable tableware has emerged as the times require. Experts believe that the development and production of green disposable tableware is becoming a new environmental protection industry in China.
In mid-February, the Ministry of Science and Technology, together with the State Economic and Trade Commission, the State Environmental Protection Administration and the Ministry of Railways, jointly held an exchange meeting on the development of green tableware technology. At the meeting, the reporter interviewed Wang Zhixue, the head of China Rural Technology Development Center, and the managers of several production enterprises.
Wang Zhi said: At present, the green disposable tableware developed and produced in China can be divided into paper pulp, rice husk, straw and starch according to the types of raw materials. At present, hundreds of enterprises in China produce paper disposable tableware, with an annual production capacity of about 3 billion pieces.
The raw materials of paper tableware are seriously polluted in the production process, with high cost and poor strength, water resistance and moisture resistance
. Therefore, its popularization and application have great limitations, and people naturally look to other places for benefits from science and technology. If rice husk is used as raw material to produce rice husk tableware, there are now more than a dozen enterprises of this type in China, with an annual production capacity of about 51 million; Straw tableware is mainly made of crop straw < P >. At present, there are more than a dozen manufacturers in China, with an annual production capacity of 75 million. Starch tableware takes potato starch as the main raw material, which has good biodegradability and can be used as feed after recycling. In a word, the state attaches great importance to the research and development of green disposable tableware, and gives strong support through scientific and technological development plans such as tackling key problems, Spark Plan and Torch Plan. The production technology of green disposable tableware in many enterprises is relatively mature, which has laid a foundation for industrialization.
Wuhan Far East Green World Group Co., Ltd. is a company that takes starch as raw material, carries out scientific research and development of green disposable tableware, and its economic benefits are beginning to take shape. Su Xiaohai, the president of this company, has a legendary experience:
He studied arts and crafts in Hubei Institute of Light Industry, and went to Wuhan University in 1984 for a master's degree in philosophy, and then studied and worked in Germany. The environmental protection in Europe touched him greatly, and he had the idea of going back to China to engage in environmental protection industry. Su Xiaohai told reporters: I have studied arts and crafts, and I am an aesthete. Today, I devoted myself to environmental protection such as green tableware, which originated from my initial understanding of beauty. The extension of aesthetics is, in the final analysis, a kind of philosophy.
From 1992 to 1996, the production scale of recycled cardboard disposable tableware and reed pulp molded tableware developed by Far East Green World Company has not been expanded due to low scientific and technological content. In 1996, the company sent personnel to inspect the technical situation of biodegradable packaging products in the European market, and thought that developing vegetable starch to produce fully degradable disposable tableware products might be a way to eliminate "white pollution". In 1997, it was composed of a group of experts in food, chemistry and machinery. The company focused on the development of fully degradable disposable catering products, which was included in the national torch plan in 1997.
They absorbed foreign advanced technology and made a series of innovations in combination with the domestic production technology of paper tableware: Li
used the starch rich in domestic resources, such as sweet potato and corn, as the main raw materials, instead of the single foreign potato starch with higher price
; 21% natural fiber is added to the raw material of sweet potato starch, so that the strength of tableware is obviously increased < P >, and then the product is light and soft by using the processing technology of food puffing; The equipment for surface spraying < P > treatment and shaping is strengthened, so that the produced catering products have waterproof, oil-proof and heat-resistant functions. Su Xiao
Hai made a vivid metaphor: it is just like reinforced cement in building materials, sweet potato starch is the cement, and
the roots of all kinds of hay and plants that are chopped and stirred are the steel bars, so that the strength of tableware can be obviously
enhanced.
The tableware products made from starch produced by Far East Green World were tested by SGS in Germany with reference to international food
packaging standards. The tableware products kept in hot water and hot oil at 111 degrees Celsius for more than two hours did not deform at all, and the temperature-keeping performance was excellent. Because starch and additives are natural plant raw materials, the product has excellent degradation performance. According to the test of National Environmental Testing Center, it can be degraded by more than 91% in about 11 days, and can be completely degraded within one month.
According to the introduction, because the project uses plant starch and plant fiber, the cost is relatively low, and the cost of each covered rice box is about 1.12 yuan, and the cost of uncovered lunch boxes, bowls and plates is about 1.17 yuan, which has broad market prospects.
At present, Far East Green World Company plans to invest 611 million yuan to build a large-scale fully degradable green disposable tableware production base with an annual output of 5 billion pairs of disposable chopsticks and 3.5 billion bowls, plates, boxes and other products. After the project is put into production, the annual output value can be
625 million yuan, and the new profit and tax will be about 311 million yuan. The civil engineering of the base started in March this year, and
a standard factory building of 21,111 square meters has been built. If the follow-up funds can be guaranteed, it is expected to reach the production by the end of 1999.
Su Xiaohai said: Our scientific and technological advantages are obvious, and the social benefits that can be created in the future are also obvious: disposable sanitary chopsticks made of starch
can completely replace disposable wooden chopsticks, that is, every year < If the Group can reach its production capacity, it is estimated that it will use more than 211,111 tons of sweet potatoes every year and process them into more than one million tons of starch raw materials, which will also lift more than one million people out of poverty and promote the development of agricultural industrialization in the old areas.
Shantou Heng Lv Industrial Co., Ltd. began to develop green disposable tableware made of rice husk in previous years, and before that, it also had the ability of industrial scale production. The disposable packaging containers made of rice husk produced by the company, especially the food packaging utensils used in supermarkets, have started trial sales in Japan, Taiwan Province, the United States and other places.
The green disposable tableware produced by Heng Lv Company is made by crushing and sieving rice husk, adding water to several edible organic polymer adhesives, and then stamping, drying, spraying and other processes to produce different shapes of
plates, bowls and other utensils.
Ji Xiaopeng, general manager of Heng Lv Enterprise Co., Ltd. said: Disposable tableware is made of rice husk, which is not only abundant in our state-owned assets, but also can be quickly degraded in the soil after use, killing two birds with one stone.
at present, Heng Lv company has a production line in operation, with an investment of about 9.8 million yuan and a production capacity of 411,111
tableware/day, and now it reaches 211,111 tableware/day. The annual output value is about 36 million yuan, the expected payback period is about
one and a half years, and the investment profit is about 31%. The production technology and product quality have passed the
technical appraisal organized by Guangdong Science and Technology Commission and the inspection of food hygiene department. According to reports, the company plans to set up a group company in the near future in order to better market its products and regulate the operation of < P > mode, and to invest in technical transformation in order to make the production of < P > line more automatic.
According to the introduction of the green tableware technology development exchange meeting hosted by the Ministry of Science and Technology, on July 8, 1998, Vice Premier Wen Jiabao specifically proposed to solve the "white pollution" along the Yangtze River, Taihu Lake and
railway within one year at the Taihu Lake Basin water pollution prevention work conference, and asked the relevant departments in the State Council to focus on three tasks: first, strengthen management,
prohibit littering; Second, stop using disposable foamed plastic tableware; Third, develop and mass-produce substitute products as soon as possible. On 11-14, Vice Premier Li Lanqing also
raised the issue of popularization and application of foamed plastic tableware substitutes at the 12nd National patriotic health campaign committee Working Conference. It seems that the green disposable tableware has attracted great attention from the leaders of the Central Committee and relevant departments of science, technology and environmental protection. As a new environmental protection industry, it can be said that it was born at the right time. Now, we need both scientific and technological personnel who can climb the scientific peak to continue to tackle key problems and develop, and entrepreneurs who know how to operate and manage well.