Back to the Republic of China to be a editor

How did Pharaoh write a dissertation?

The full text of this thesis is 10 words, 10 words is the abstract and the beginning, and then - [-] decimal places of pi.

cough……

It is a joke to say that Lao Wang's thesis is watery. T51 plus Pharaoh, this 10-digit pi has created a world record.

In 1949, ENIAC ran for 70 hours and calculated 2037 digits of pi after the decimal point. Before that, mathematicians who specialized in calculation were bald, and the highest record was only 808 digits.

However, after ENIAC, until the mid-50s, the world record of pi remained at the level of 3000+ digits.

In the original world, the first time to calculate pi to 10 decimal places was in 1961. LR Smith calculated it with IBM's transistor computer.

And Wang Yongjun is just practicing his calculation of pi, practicing the algorithm optimization path he came up with.

In the 50 Center, the supercomputer will be fully activated when the U.S. military regularly changes the key. After the key is solved, the supercomputer will be idle for nearly 2 weeks.Wang Yongjun is using these gaps to improve his algorithmic thinking. After he has new ideas, he uses super calculations as experiments.Before calculating this 10-digit pi, he has used the TC51 supercomputer to calculate 1-digit pi several times, as well as other strange calculations, mainly to test whether the new algorithm will shorten the calculation time.

Let’s talk about the cracking of the C52 cipher machine.The biggest problem for Wang Yongjun this time was to collect the ciphertext. Because the U.S. military uses less and less radios now, it took Wang Yongjun 6 full days to collect the 3000-word ciphertext that was confirmed to be issued by the U.S. Navy.

T51 started to run the long-prepared ciphertext-only cracking program, but after 2 hours of operation, Wang Yongjun ordered to stop the operation.Adjust the program one last time and start over.It took 6 days to collect all the ciphertexts, and it took 1 day to crack C52...

21 hours and 20 minutes, to be exact.

……

"Have you ever cracked the password after TC52 is installed? How efficient is it? Don"

用战情中心的新计算机给50中心发消息。50中心那边，随着TC52一起运过去的也有2台T52，等了一会儿，王永俊从50中心回复：

“3月20破解美海军密码用时6小时多，21日破解南朝鲜军5小时10分，破解美军5小时30分。”

"It means that the calculation speed is about four times faster than that of TC51, which is in line with the design goal."

"The U.S. military now maintains a 15-day replacement key. If there is no large-scale offensive operation, it will take 4 to 5 days to collect enough ciphertext, and it will take a few hours to crack, which is about one-third of a cycle. It is impossible to read the secret messages of the U.S. military immediately. For a large-scale operation like March 3-22, enough ciphertext can be collected within 24 hours, and the time period when the secret messages cannot be read immediately is less than 24%.”

Tang Hua read these words to Su Yu, and then replied: "Chief of Staff Su said that the intelligence response rate is quite satisfactory."

……

When Tang Hua returned to Beijing from Wuhan, he came back with Commander Xiao of the Navy, Deputy Commander Luo Shunchu, and Director of the Navy's Repair Department Lin Taizhen.

Several people and the navy's exploration team looked at the terrain and the width and depth of the Yangtze River in Wuhan, and generally believed that Wuhan had the basic conditions for building submarines and special shipyards.

After I had my heart in my mind, I returned to Beijing and began to prepare materials for a working visit to the Soviet Union.

This visit dates back to the "Navy Three-Year Work Plan" formulated in 1950.According to Luo Shunchu, this is a naval development plan "basically based on the minimum needs for performing combat missions". It is necessary to build and purchase ships, aircraft, coastal guns, docks, warehouses, and airports to enrich the entire naval combat capability.

On October 1950, 10, the navy's three-year plan was suspended, and the funds scheduled for the navy were used for the war to resist US aggression and aid Korea.

At the beginning of 1952, the Prime Minister notified the Finance and Economics Committee and the Navy that the Navy's development plan was resumed, and the three-year work plan was changed to a five-year work plan.Although the schedule has been changed, two basic points have not changed: one is to use Soviet loans, and the other is to provide equipment or technology from the Soviet side.

After several visits to the Soviet Union for negotiations, it should be on June 1953, 6 that China and the Soviet Union signed the "Agreement on Naval Delivery and Technical Assistance to China in the Construction of Warships". - Four" agreement.

"We resisted the U.S. and aided Korea. We fought against the U.S. in North Korea. We were doing things for the Sino-Soviet-Korean alliance. Therefore, the Soviet Union can give us one batch of free aid in terms of weapons and equipment, and two batches at half price." Tang Hua said, "But the liberation of Taiwan basically counts. China’s own business, so it will first encounter the problem of money. To put it bluntly, it has to be paid at its own expense. The Prime Minister and Vice Premier Chen of the Finance and Economics Committee have given a figure, a total of 5 million rubles, the total cost of attracting Russia. Among them We need to pay 3 million rubles after the agreement is signed, and the other 2 million rubles are loans, which will be repaid slowly later.”

Luo Shunchu: "When we put forward the three-year work plan the year before last, we wrote that we would spend 7.5 million rubles to initially build a modern navy with a certain scale within three years. Now the figure has become 5 million rubles... There is no other way, the country is in difficulty now, and the War to Resist U.S. Aggression and Aid Korea is not yet over. But the ships and weapons that were to be purchased in the three-year work plan need to be adjusted now, and the less important ones should be deleted."

Lin Taizhen: "The list listed in the three-year plan has too much funds.... If you want to delete it, you should keep more of these industrial facilities such as shipyards."

Tang Hua didn't answer first, but just smiled.

China touched its own purse and proposed a 5 million ruble equipment import plan. It visited the Soviet Union in 1952 and showed it to Stalin. Stalin believed that the plan of the Chinese comrades was too small and not strong enough and should be expanded.In fact, the June-Fourth Agreement used a total of 9 million rubles, of which 3 million rubles were cash and 6 million rubles were loans, which will be repaid slowly in the future.

Tang Hua: "When compiling the first edition of the budget, although there was a line for the total budget, such as 5 million rubles, you should not be stuck with the figure of 5 million rubles in the first edition of the budget. First of all, the Soviet Union did not say what it said. , What if we went to the Soviet Union and had a great deal, and the Soviet Union suddenly agreed to offer [-]% off and [-]% off? What if our finances are looser and we can allocate more foreign exchange for naval construction? Suddenly there is more money, Temporarily adding items to it may not be a system, and the purchased equipment and technology will be very messy. First, list more, and then show it to the Prime Minister, and then reduce it when you really want to delete it.”

After talking about the tips for discussing the budget, Tang Hua and the three of them took out the plan formulated in 1950 to see what could be adjusted one by one.

"The first is to develop the shipbuilding industry. With the technology and equipment aided by the Soviet Union, we will renovate and expand the shipyards in Jiangnan, Dalian, Huangpu, Qingdao, etc..." Tang Hua looked, "We went to Wuhan some time ago, and we need to add one there."

Commander Xiao Jinguang: "Jiangnan Shipyard has completed the refitting of ships 31 and 32. With a little help from Soviet comrades, it can reach the level of assembling Soviet-made Type 01 frigates. Huangpu and Qingdao are used as naval ship repair factories. Dalian Shipyard will immediately The 123K hull can be built, is it positioned as a construction factory for various combat speedboats?"

Lin Taizhen: "It may be a waste of time for the Dalian factory. The technical content of small boats is not high. As long as the main engine and shaft are transported by train, even Huangpu and Qingdao can be manufactured."

Tang Hua: "Small boats are really not worth using the Dalian factory for special construction. There should be one in Dalian and Shanghai for the construction of medium-sized and above surface ships. The Jiangnan factory is used to assemble Type 01 frigates, and the Dalian factory is used to repair and refit the destroyer project. Bring it up."

Luo Shunchu: "Minister Tang, do you really want to keep the introduction project of torpedo artillery destroyers? As long as destroyers are introduced, this plan will definitely exceed 5 million rubles."

Tang Hua: "This destroyer is multi-functional. It can fight in mid-near seas and has a high speed. Although we will be fighting near the coast for some time in the future, if we want to liberate Taiwan, there are not a few large ships."

Luo Shunchu: "Then bite the bullet and put it in... In 1950, we proposed to introduce 2 S-type submarines and 4 M-type submarines. Now everyone agrees to set up a submarine factory in Wuhan, so can we propose that some submarines be produced by the Soviet Union?" Provide accessories and assemble in Wuhan?"

Tang Hua: "If it is assembled, it will be a big problem. The S-type is a small and medium-sized submarine, and the M-type is a small submarine. However, the production of these two submarines has been discontinued, and there are no parts for us to install."

The torpedo submarines of the Soviet Union in the early post-war period, 611 and later 641 are large submarines, and the Wuchang Shipyard, which was first built, is exempt from discussion. 613 and 633 are medium-sized submarines, and they start at least 1300 tons, which is not easy to build.

Are there any mini-submarines?Yes, models 615 and 617.One type is a conventional AIP-powered submarine with a closed-cycle diesel engine, and the other is a conventional AIP-powered submarine with a peroxide Walter engine, both of which are black technology verification models.This Nima is even more difficult to deal with than a large submarine.

"First buy 2 S-type and 4 M-type for the submarine force to train the crew, then we bought the blueprint of the M-type small submarine from the Soviet Union, and then disassembled an M-type submarine for research, at the Wuchang Shipyard After it is built, try to imitate the M-type." Tang Hua said, "Small submarines may have limited use in future naval warfare, but they can indeed be used by shipyards. And if this kind of submarine is built well in the future, even our navy will not need it. , can also be exported. Because the Soviet Union is likely to abandon this level of submarine production line."

The matter of the submarine is settled, and there is also the big head of HNA aircraft, including a package plan for aircraft, ground maintenance equipment, and airport equipment.This aspect can only be slightly adjusted, and cannot be substantially deleted.

Tang Hua: "There are 150 artillery pieces, of which 65 are bulk naval guns, which are used to transform the gunboats of the uprising; 80 large-caliber coastal artillery pieces are used for port defense...cut, at least half."

Xiao Jinguang: "That's right, shore-to-ship missiles can replace most of the role of coastal artillery."

At the end of the report, Tang Hua raised his head: "I seem to have found something missing in this plan. The uprising cruiser 'Chongqing' we sunk, do you want to repair it? How?"

Chapter 208, "Chongqing" ship regeneration

Speaking of the Chongqing ship, Commander Xiao put down the information in his hand: "When the three-year plan was formulated in 1950, the Chongqing ship was still soaked in water, so it was not listed. It has been almost a year since the Chongqing ship was salvaged. The Soviet Union Expert Pustin Chaifu also made an inspection report in October last year, but the required funds were too high, 1 million rubles, and another 10 billion yuan was needed in the country. Shun Chu saw the report last year and said that the ship I can't afford to fix it. Why don't you think about it this year and take this opportunity to fix it?"

The "Chongqing" cruiser was originally the No. 4 ship of the British Linxian-class light cruiser "Dawn Goddess". After the end of World War II, the United Kingdom gave it to the government as compensation for the British requisition of Chinese merchant ships and harbor patrol boats during the Anti-Japanese War. At the end of 1948, the "Chongqing" ship returned to China, participated in the Liaoshen Campaign, and then returned to Shanghai. It coincided with the financial reforms of the second son of Chiang Kai-shek. February uprising.

After the uprising, the "Chongqing" ship sailed from Wusongkou to the Yantai Liberated Area, and then moved to Huludao. Other warships of the national army and navy could not beat the "Chongqing" ship, so no national army warship dared to intercept it.But later, the National Army Air Force discovered the "Chongqing" ship and sent planes to bomb it continuously. The uprising officers and soldiers had to open the sea valve and sink themselves to prevent the warship from being completely blown up.

Then the Chongqing ship was soaked in the water for two years, and it was not salvaged until May 1951.

Luo Shunchu: "In June last year, we towed the Chongqing ship to the Dalian Chuanqu Factory, and the factory director, Gavrilov, sent someone to inspect the Chongqing ship in dock. I still remember the conclusion of the inspection report: the hull is qualified; 6 The internal turbine gear linkage has been damaged; the boiler is apparently undamaged; electrical equipment, all instruments, optical equipment, and communication equipment are no longer suitable; the main gun part can be repaired; the anti-aircraft gun needs to be replaced. In short, it is more troublesome to repair. Chaifu gave a repair and transformation plan, after all the repairs, although the Chongqing ship is not the most advanced cruiser, it is not considered backward, and can continue to perform the mission of the cruiser, and can also serve as the command ship of the destroyer fleet."

Tang Hua: "It seems that the biggest problem is that the repair cost is too expensive, 5000 million rubles, equivalent to 1000 million U.S. dollars. The United States built a brand new Atlanta class, which is bigger than the Chongqing ship, and only 2300 million U.S. dollars."

Luo Shunchu: "According to the price listed in Pustin Chaifu's plan, the money spent on repairing the Chongqing ship may be more cost-effective if it is used to buy intact Soviet warships in active service."

这倒是没错。5000万卢布的外汇加上国内还要筹集1800亿（1800万）元经费，和4艘07型驱逐舰的总价也差不多了。4艘07型驱逐舰有16门130毫米舰炮，重庆舰上只有6门152毫米舰炮，07型个头虽然小，但如果投入战争，4艘舰总比1艘舰活得长吧，再不济也能多浪费一些敌方的弹药……

Commander Xiao: "If we ask for a lower level, it means repairing it to a usable state, without doing a full-scale modification, as long as it can sail to sea and shoot guns, will it be possible to spend less money?"

Tang Hua also became interested when he heard Commander Xiao say this: "We can review Pustin Chaifu's plan in detail, and build a beggar's version on his basis—that is, use cheaper accessories or systems. Lin Minister, is the Chongqing ship scheduled to be rebuilt in Dalian?"