Xiao Li, a staff member from the organizing committee of the World Conference of Chinese Mathematicians, was extremely polite, even with a hint of expectation and pleading.

In fact, it is not surprising. The "iccm Mathematics Prize" has been awarded nine times so far. Although it has attracted great attention and is quite famous among Chinese mathematicians around the world, it is also known as the "Fields Medal for Chinese mathematicians."

But its international authority and reputation are only based on Mr. Qiu's lofty reputation.

Compared with the Ramanu Gold Medal, the Mathematics Breakthrough Prize, and the Kohl Medal, the "iccm Mathematics Prize" is inferior in terms of historical background and actual status. In front of Qin Ke and Ning Qingyun, who have already won the genuine Fields Medal, they have to hold it high.

At most it can only be regarded as a dispensable "small prize".

Even the Ramanu Gold Award had to beg Ning Qingjun to go to India to receive the award, and the mere "iccm Mathematics Award" had to beg Qin Ke and Ning Qingjun to "take the time" to attend the meeting and receive the award.

"Is it August 10th? One day or a few days?"

"The opening ceremony and award ceremony are on August 10th, and there will be three days of academic exchanges next. We also hope that you and Professor Ning can continue to attend, but everything is based on your and Professor Ning's schedule, and we dare not force it.

"

Qin Ke made a mouth gesture, and the dim light on his phone immediately opened the schedule.

There is an itinerary to be determined from August 8 to August 15. It was an invitation sent by Mr. Faltings on behalf of the American Mathematical Society (ams), inviting Qin Ke and Ning Qingjun to participate in a world academic exchange in the field of number theory.

meeting.

However, Qin Ke had not received the date of meeting with Ning Zongxun and his wife from Uncle Yang at that time, so he did not dare to agree easily.

A few days ago, Uncle Yang confirmed that the date of the meeting was July 25th. Qin Ke was so busy that he forgot to reply to Faltings for a while. At this time, he had to face two choices, whether to participate in this world of Xia Mathematics

Family conference, or participate in the World Number Theory Academic Congress organized by the American Mathematical Society?

From the perspective of influence and establishment of authority, it is undoubtedly more useful to attend AMS conferences.

But Qin Ke took into account Mr. Qiu's concern for him, and considered motivating Xia students to learn mathematics better, expanding his influence in the circle of Xia mathematicians, and thus better changing the current Xia mathematics community in the future.

Despite all the evil tendencies, I still decided to participate in the World Conference of Chinese Mathematicians of Chinese descent.

As for winning awards, Qin Ke really doesn't pay much attention to them. In the current mathematics world, except for the Wolf Prize, the Abel Prize, and the Chen Shengshen Prize, there are really no awards that Qin Ke takes seriously.

"Okay, Professor Ning and I will attend, including the subsequent three-day academic exchange meeting."

"Thank you so much! We will personally send the formal invitation letter to Qingmu University. If possible... could you please give an acceptance speech at the opening ceremony? It doesn't need to be long, it will only take about three minutes."

Staff member Xiao Li requested in an extremely respectful and polite manner.

"Okay." Qin Ke readily agreed.

“Thank you again for your support of our conference! We will contact you to confirm the itinerary in the future. All air tickets and travel expenses will be properly arranged by us. Please rest assured that you and Professor Ning will not disturb you anymore. We look forward to seeing you and Ning.

The arrival of the professor."

Listening to the polite and humble tone of Xiao Li, the staff member on the other side of the phone, Qin Ke couldn't help but burst into laughter, realizing once again that he seemed to have become a mathematician who could rival Mr. Qiu.

After ending the call, Qin Ke lip-talked into the phone: "Shiguang, help me reply to Mr. Faltings' email. Just say that I have other important matters and cannot attend the World Number Theory Academic Conference in August. Please be polite.

point."

Shimmer immediately replied: "Received, Master Qin Ke."

Now level 4 Weiguang is a relatively qualified assistant, and can handle personal tasks such as helping to reply to emails and replying to ordinary WeChat messages, which has relieved a lot of the burden on Qin Ke and Ning Qingyun.

Of course, Weiguang still cannot replace the work assistant Fang Yongtang in assisting Qin Ke in management and understanding the role of Qing Ning Technology and Qing Ning Student Aid Foundation.

"Brother, brother, look!" Qin Xiaoke had already emerged from the locker room at this time, pushing Ning Qingyun to Qin Ke like a treasure.

The surroundings seemed to light up, and Ning Qingyun, who had put on a new dress and had a blushing face, was reflected in Qin Ke's eyes.

A lovely pure white skirt, with a thin white belt tied into a beautiful bow at the waist. The most eye-catching thing is naturally the dazzling white legs with beautiful curves under the skirt.

Moreover, Ning Qingyun also took off her hat and put on her twin ponytails. Coupled with her innocent and beautiful face that was flushed, it was even more adorable.

Even though he had seen the most beautiful side of Ning Qingyun, Qin Ke still felt hot when he saw his girlfriend wearing a cute style. Sure enough, having a girlfriend who looks good in whatever clothes she wears is pleasing to the eye.

If it weren't for the big sunglasses that obscured her beautiful face, the entire clothing store's clerks and customers would probably have come to watch.

"How...what?" Ning Qingyun asked in a low voice with a blushing face as she felt a little embarrassed by Qin Ke's scorching gaze.

Qin Ke said with a smile: "It's great, I'll buy this set, but you can't wear it outside, otherwise my love rivals will increase by hundreds of millions."

"Glib." Ning Qingyun rolled her eyes at Qin Ke, bit her red lips and hesitated: "But I feel like my mother might not like me wearing this style of skirt."

"Huh? I just plan to let you wear this outfit at home for me to see. Why don't you choose new clothes when you meet your parents? Xiaoke, I leave it to you. I will help Sister Ning pick out ten sets of clothes for you today, and I will give them to you later.

You have two tricks, let’s do it.”

"Yeah, long live my brother——! Sister Ning, let's go!"

"I...I don't need to buy so many new clothes..."

Qin Ke smiled and added: "Tomorrow we will stay in a resort villa with a private swimming pool. You two can also buy swimsuits together."

"Wow, that's great. Brother, your arrangement is amazing! I haven't gone swimming for several years! Sister Ning, sister Ning, can we choose two sets of matching swimsuits?"

This chapter is not over yet, please click on the next page to continue reading! Looking at Qin Xiaoke, who is as close as a sister to Ning Qingyun, Qin Ke couldn't help but twitch the corner of his mouth. A good relationship between sister-in-law and sister-in-law can reduce countless family troubles, and can also solve the problem to a certain extent.

It makes up for Ning Qingyun’s lack of family ties as he has no brothers and sisters.

For example, at this moment, Ning Qingyun was a little helpless and a little embarrassed, but with a happy and doting smile, which is the best portrayal.

…

In the next two days, Qin Ke took his girlfriend and sister to travel around and enjoy a rare vacation. On the other side, Lao Yang was sitting in the office, looking at the documents in his hand with a headache.

This is the most important instruction issued by the superiors yesterday.

The instruction was very simple, requiring him to convene experts in desert management as soon as possible to find the most economical, affordable and effective method to prevent and control desertification.

As for the reason, it was not explained in the instructions above, but Lao Yang also knew what was going on. After all, Ning Zongxun submitted the "Report on the necessity of carrying out desert prevention and control as soon as possible to prevent the occurrence of large-scale sandstorms in the future and the danger of accelerated desert expansion."

》, it must be reviewed by him and the top leaders of several departments at the same time before it is submitted.

In that top-secret report, Academician Ning Zongxun said that after two recent deductions by the institute and combined with the research results of more than ten years, it has been basically determined that in the next five years, the size of various large and small deserts in the country will be determined.

The frequency of sandstorms will increase year by year, and the climate in various places will also experience changes. Rainfall will decrease year by year, and the decrease may reach 27% in five years. Drought will become the norm in most parts of the country, and deserts and surrounding areas

The maximum temperature in summer will increase by about 8 degrees Celsius.

The decrease in rainfall and increase in temperature will have serious consequences, which will accelerate the expansion of deserts. If good methods for preventing and controlling desertification are not thought of, the area of ​​domestic deserts will expand by about 20% within five years.

, the originally over-cultivated and over-grazed prairie will also experience severe green retreat and sand intrusion. The probability of super-large sandstorms sweeping several northern provinces in the next five years is as high as 17%!

At the end of the report, Academician Ning Zongxun and his wife proposed in the most serious and solemn manner that desertification prevention and control must be elevated to a strategic level related to survival, adopt all new technologies as much as possible, and allocate sufficient funds to prevent desertification.

expansion, otherwise the deterioration of the situation will be irreversible in five years.

The superiors obviously attached great importance to it. After the report was submitted, I heard that they had a direct dialogue with Ning Zongxun and his wife at the research institute, and then quickly issued this urgent instruction to Lao Yang.

Lao Yang has a terrible headache. He understands the country's difficulties. Now it has to spend money on everything, education, medical care, infrastructure... Which one is not a gold-swallowing beast? The finances are tight, no matter how squeezed or tilted, the cost of preventing and controlling desertification

It is also limited, and the higher authorities can only pin their hopes on "scientific and technological progress" and hope for some economical and affordable desert prevention and control plan.

But what novel solutions can be found in China to prevent and control desertification?

Yes, many effective desertification prevention and control programs have indeed been proposed over the past decade or so, including building protective forests to prevent sand, using mechanical sand barriers to compress sand, protecting vegetation in sandy areas to block sand, developing sand industry to control sand, etc. The most famous one is the use of

A "five-belt-in-one" plan consisting of a sand-fixing fire prevention belt, an irrigated afforestation belt, a grass-barrier plant belt, a frontier sand-blocking belt and a sand-sealing and grass-cultivating belt has been developed. In addition, some areas have barely explored the so-called "desert control" and "sand control".

An integrated plan to combat poverty.

In terms of new technologies, there are also water-conducting precision desert seedling planting tools, Haloxylon ammodendron water drill planting, pla sand fixation, HDPE new sand blocking net sand barriers, simulated shrub sand control, sand soil conversion technology, etc.

However, most of these technologies and solutions are very expensive and have no significance for promotion. They can only achieve results on a small scale. Once the investment funds are reduced, they will soon return to their original shape.

For example, the current desertification control effect is relatively good, and afforestation has been implemented all the time, with Populus euphratica forest being the most representative.

Populus euphratica is known as the "Desert Hero". Writers call it "it will survive for a thousand years when it is born, it will survive for a thousand years when it dies, and it will survive for a thousand years when it falls." It has remarkable effects in preventing wind and sand fixation and maintaining ecological balance. The spread of desert can also improve the soil to a certain extent, but even the most cost-effective afforestation of Populus euphratica forest is not cheap.

First of all, in order for a Populus euphratica tree to really play a role, it must be at least ten years old. The planting cost of each Populus euphratica tree is about 70 yuan. If you plant 42 trees per acre, the planting cost per acre is about 2,900 yuan. The survival rate of poplar trees is only 30% in three years, and only about 10% after ten years. That is to say, it costs 700,000 to plant 10,000 poplar trees, but in the end only 1,000 trees can play a role in preventing and controlling desertification. This is still A lot of money is spent on maintenance every year to ensure the final 10% survival rate. If it is left to fend for itself, the survival rate will even be lower than 1%!

Secondly, there is no economic benefit to planting Populus euphratica forest. Once the money is invested, it will have no other use except to prevent and control desertification. It can neither bear fruit nor be cut down for timber.

For these "gold-eating beasts" that can only enter but cannot exit, it is absolutely impossible to implement desert control and prevention in all deserts across the country, let alone achieve significant results within five years.
Chapter completed!