Into Unscientific

  Chapter 553 Donkey without me This book can’t write 3.2 million words

   "The apocrine fluid of a donkey."

   Hearing the word that came out of Xu Yun's mouth.

  Qian Bingqiong and Ye Duzheng had a big question mark on their serious faces:

   "o.O?"

  Apocrine secretion?

   What is that?

   A few seconds passed.

  Qian Bingqiong regained his senses first.

  He touched his chin lightly, with a hint of speculation in his eyes, and said to Xu Yun:

   "Comrade Han Li, do you mean the apocrine secretion is something made of donkey skin, which is the donkey-hide gelatin in the traditional concept?"

   In Qian Bingqiong's mind.

   The apocrine secretion that Xu Yun mentioned mostly refers to donkey-hide gelatin.

   It’s just that Xu Yun has been in Europe for a long time, so he forgot to express it in traditional terms for a while.

  However, Xu Yun quickly shook his head and explained:

   "Comrade Qian, you misunderstood. What I'm talking about is not donkey-hide gelatin, but a special mucus secreted from the surface of donkeys."

   "This kind of mucus is secreted by the donkey's exocrine glands. To put it bluntly, it should be understood as the donkey's sweat."

   Well known.

  In addition to thermal conductivity, compression resistance, and light texture, the airship capsule material also has a very important property requirement.

That is.

   Flexibility. Or high ductility.

  This property is not difficult to understand from the context.

  The floating position of the stratospheric airship is at an altitude of 20,000 to 30,000 meters or even higher above the ground.

  Its inner wall can use a gas exchange membrane to reduce the pressure difference, while the body surface needs to withstand various external and internal forces.

  So without a certain degree of toughness is obviously not enough.

  The solution in this aspect of later generations is relatively fixed, generally using composite materials and polymer materials.

   For example, polyimide film, polytetrafluoroethylene and so on.

   After all, the industrial level has already reached that level.

   At the time when Xu Yun traveled through.

  The domestic stratospheric airship has even been developed to add micro-nano materials for optimization, and it is quite mature.

  But in this era, Xu Yun has few choices.

  The quality of cotton fabric and nylon is obviously not up to standard, and the Mylar film is still tightly held by DuPont, and it is listed in the first column of the third page of contraband.

  So after thinking about it.

  Xu Yun suddenly thought of a wonderful idea:

correct.

  Can you find the protagonist of this book, brother donkey?

do not forget.

   At the end of the original 1850 copy, Halo once gave a hemostatic gel task reward.

   After returning to reality.

  Xu Yun handed over this technology to his good friend Qiu Sheng.

   As a result, during a quantitative experiment, Qiu Sheng accidentally stained a tuft of donkey hair with some mucus from the surface of the donkey that had not been cleaned.

  Then Qiu Sheng found out.

   After standing with benzoquinoline for a period of time, these mucus will form a colloidal object with very high viscosity.

  So Qiu Sheng used a rheometer to measure the longitudinal adhesion, and found that its viscosity curve exceeded 860. (see chapter 352)

  This situation is also in line with the original papers of Academician Yang Huanming, namely 10.13881/j.cnki.hljxmsy.2021.02.0100 and 10.28502/n.cnki.nkjrb.2014.007254.

  As for benzoquinoline.

   This thing came out as early as 1926.

  Even in this era, there are no fewer than twenty domestic units with production capacity.

   So naturally.

  Xu Yun put his thoughts on the mucus of the local donkey, that is, the apical secretion.

  Just mix the apocrine secretion with benzoquinoline and let it stand still to debug the colloid that Qiu Sheng had at the beginning.

  The rest is to make it into a solid capsule - this step can be left to the domestic chemical experts, this is not a particularly difficult technology.

   Indeed.

  A native donkey can not contribute much apocrine secretion.

   But don't forget

  The time when Pakistani donkeys 'invaded' the country was in the 1990s, and there are still more than 30 years from now.

   That is to say

   At present, almost all donkeys in China are standard local donkeys!

  Based on data released by later generations.

  Currently, there are hundreds of local donkeys in the entire 221 factory, and there are even more local donkeys in Haiyan County not far away.

   That is to say, under the condition of full mobilization, it should not be a big problem to collect 500 donkeys in the base.

   If it doesn’t work, you can still transfer from the provincial capital—there are many factories in Xihai Province, and donkeys are used to help in various places.

   In a sense.

  Donkeys today are as common as cars in later generations.

  As for how to produce apocrine secretion.

joke.

  Isn’t it enough to pull and grind?

  Anyway, everyone in the base is eating corn bread every day. Although the corn bread these days is far from as refined as later generations, no matter what, it must be mixed with noodles.

  So as long as the local donkeys are pulled in the sun to ensure water and body, it is too easy to get together the apex secretion

  Think here.

   Qian Bingqiong on the opposite side also roughly understood Xu Yun's thoughts.

  Although he didn't know whether what Xu Yun said was true.

   But it is very easy to verify this kind of thing. It is completely possible to find someone to conduct experiments after leaving the house-there are many benzoquinolines in the base.

  So he didn't think about it for too long, so he quickly changed the subject and said to Xu Yun:

   "Comrade Han Li, even if the airship you mentioned can be successfully produced, what about the remaining two questions?"

   "That is, how to ensure that the specific trajectory of the U2 reconnaissance plane can be grasped, and that the falling missile can accurately hit the U2 reconnaissance plane?"

   Hear this statement.

  Ye Duzheng and the others also pricked up their ears.

   Have to admit.

  Xu Yun's previous ideas about airships were really tempting, and they had successfully aroused their curiosity.

   Straighten up the little gossip ears.jpg.

  Xu Yun didn't hold back on this, and quickly put up a second finger, explaining:

   "Comrade Qian, let's go one by one in order, and first talk about how to grasp the trajectory of the U2 reconnaissance plane"

   said.

  Xu Yun looked at Ye Duzheng and said to him:

   "Director Ye, your question is actually a little out of standard—have you forgotten the equipment you have been using these days?"

   "The device I've been using these days?"

  Ye Duzheng was slightly taken aback, and it took him two seconds to recall before realizing:

   "Comrade Han Li, you mean the weather Doppler radar?"

  Xu Yun nodded, affirming:

   "Yes, it is weather Doppler radar, which can actually solve the trajectory problem you mentioned."

   "After all, the weather Doppler radar works in a wide band, ranging from L waves to X waves—this is to deal with different situations such as ice, wind, cloud, and rain."

   "However, U2 has a much narrower band of fire control radar, mainly C-wave, X-wave, and Ku-wave."

   "So we can completely modify the radar band and tune it into a harmless detection radar for humans and animals—U2 doesn't know that our Doppler radar has a one-dimensional imaging capability comparable to fire control radar."

   Speaking of which.

  Xu Yun could not help but look at Ye Duzheng meaningfully.

  Actually, apart from the above content, he still has some things he can't say clearly.

   That is.

  According to many materials decrypted by later generations.

  U2 In order to be able to capture video data to the greatest extent, the equipment on the entire body is almost barren to the extreme.

   For example, there is no remote communication equipment on U2 at all.

   That's right.

  No remote communication equipment.

   That is, U2 was completely unable to communicate with the base where it took off during the mission.

  This is also the reason why U2 was shot down successively in Maoxiong and Rabbit territory in the original history, but the reason why the other side of the sea thought it was an accidental crash at first.

   Another example.

  U2 is only equipped with three detection radars that can detect fire control radars, and there is no other type of detection equipment other than that.

   That is to say

  U2 can only detect the specific millimeter wave of the fire control radar, and the rest cannot be detected even by ordinary search radar signals.

Of course.

  The reason why U2 is designed in this way is really not thinking of pitting pilots.

   It's because the search radar these days can't reach the three-coordinate accuracy of the fire control radar at all, so even if U2 is scanned by the search radar, nothing will happen - at most, it will expose itself to fly to a certain area.

   It is simply impossible to lock the precise flight trajectory by searching the radar.

  So it only needs to consider the signal of the fire control radar, and the remaining space can be used to store film.

   But the problem is

  With the appearance of Xu Yun, weather Doppler radar has come out ahead of schedule.

  Although in 2023 when Xu Yun traveled, the Doppler principle has also been widely used in the field of fire control radar.

  But this part of the application is mainly in the x-wave and ku-band, which does not mean that the weather Doppler radar after adjusting the wavelength is also a fire control radar.

   Just adjust the wavelength to something like 1.7 centimeters.

  With the assistance of dual-band and one-dimensional imaging methods, it can completely wear the appearance of detection radar, but has the accuracy of fire control radar.

   That is, when U2 is completely undetectable, it can successfully grasp its flight trajectory.

  Input according to the components originally assembled in the base.

  The weather Doppler radar in the base has a scanning range of up to 500 kilometers, which means it can grasp the precise movement of the U2 reconnaissance plane within 40 minutes!

more importantly.

   This is also an idea that could be practically tested in the short term—just try it out the next time U2 is flying.

  If U2 temporarily changes its course or raises its altitude.

   That means this trick is useless to U2, it found the peeping of the rabbits.

  But if U2 still flies along the established route

   After realizing this.

  Ye Duzheng's breathing suddenly became a little heavy, and he stared at Xu Yun with burning eyes:

   "Then Comrade Han Li, what about the third question I mentioned?"

  How to ensure that the falling missile can accurately hit the U2 reconnaissance plane.

  In the three questions raised by Ye Duzheng.

  This is actually the most difficult one.

To know.

  U2's regular flight altitude is 22,000 meters, and it can be lifted to 25,000 or even 27,000 meters at its highest.

  This means that the height of the stratospheric airship must be at least 30,000 meters above, so that it will not be observed by U2 pilots within the line of sight through naked eye vision.

  When U2 performs the task of taking pictures, the altitude will generally be reduced to about 18,000 meters.

   That is, in the actual combat stage.

  The straight-line altitude difference between the stratospheric airship and U2 will most likely reach more than 10,000 meters!

  Missile pursuit at this height is not as easy as calculating free fall like middle school and high school physics. Many very complicated scenarios need to be considered:

   For example, wind resistance.

  For example, the air pressure difference at different altitudes produces subtle deformations on the missile.

   Another example is U2’s speed change or even track change.

  It’s like you’re at the highest point of the central building in Shanghai, and you want to throw a chalk head at a person walking on the road 500 meters away.

   No matter how accurate your calculations are, there will be various irresistible situations. When Bao Buqi is about to reach the position, a child on the side of the road yells, and the target stops and looks at it for two seconds. Who can calculate this?

But on the other hand.

  Since Xu Yun has considered the first two situations, it is impossible not to be aware of this problem.

   In other words.

   Xu Yun may also have a solution?

  It was directly opposite Ye Du.

  “.”

  Xu Yun was silent for a few seconds, and continued to correct the next speech in his heart, before he said slowly:

   "Director Ye, first of all, I would like to ask you a question - I wonder if you have heard of a technology."

  Ye Duzheng glanced at him:

   "What technology?"

  Xu Yun grinned lightly at the corner of his mouth:

   "Radio Proximity Fuze."

   "Radio proximity fuze?"

   Hear the word Xu Yun said.

  Ye Duzheng seemed a little confused, but Qian Bingqiong at the side spoke:

   "Comrade Han Li, you should be talking about the VT fuze invented across the sea during World War II?"

  Xu Yun nodded:

   "Exactly."

   mentioned above.

  It is indeed very difficult for a slender shell to hit an aircraft flying at high speed at an altitude of several hundred to several thousand meters.

   Students who served in the Air Force during World War II should know it.

   There were statistics during the Battle of Britain in 1940.

  If you want to hit an aircraft on the battlefield, you need to fire about 2,500 shells, which means the hit rate is 4/10,000.

   With such a probability, the pilots are basically not afraid of ground artillery, and the artillery on the ground is only used to drive away the aircraft.

   But in the middle and late World War II, a special weapon appeared.

  It is the radio proximity fuze.

  The core principle of this thing is actually the Doppler effect:

   That is to install a radar on the warhead of the shell. When the distance between the shell and the aircraft decreases, the frequency received by the radar will become higher and higher.

  When the frequency reaches a certain level, it means that it has entered the detonation range.

  In this way, the shell can detonate automatically, causing damage.

  This radio-proximity fuze bomb became the most popular weapon product in World War II. It earned a full $1 billion across the sea, and half of the Manhattan Project’s funding came from it.

  So it’s really tmd to make money doing arms

all in all.

   This kind of weapon is not unfamiliar to Qian Bingqiong, who is currently in charge of nuclear research, at least he is more familiar than Ye Duzheng, who is involved in meteorology:

   "Comrade Han Li, do you mean to add a radio proximity fuze module in front of the shell?"

   "However, the radio proximity fuze has a limited detonation range. Unless U2 happens to pass through the kill zone, it will be useless even if it is fuzed."

  "What's more, today's fighter jets and reconnaissance planes are equipped with jamming transmitters, which will emit radio waves of the same frequency but with higher power, making the missile mistakenly think that it is very close to the target and detonate."

   "So no matter from which angle you look at it, the radio proximity fuze has little chance of success."

  Xu Yun nodded when he heard the words, and frankly admitted:

   "That's right, unless hundreds or even thousands of stratospheric airships are launched into the sky at one time, and people's sea tactics are used to try their luck."

   "Otherwise, it is really wishful thinking to solve U2 by detonating the fuze by radio proximity, and the success rate is infinitely close to 0."

   "But Comrade Qian, do you think there is such a possibility?"

   "Change the fuze to another device that can lock U2's orientation by itself. It can guide the missile to change direction. It will automatically lock and catch up to the opponent without waiting for U2 to reach the landing point"

  "When the opponent turns a corner, it also turns, and when the opponent dives, it also dives, and the speed is faster than the limit speed of the plane. Finally."

   "Boom!"

  Xu Yun's long voice sounded to Qian Bingqiong's ears, just like the whisper of a succubus. Ahem, a devil.

   Under a few words.

   This made Qian Bingqiong's heart thump.

  A shell that can lock the opponent's position and change direction to pursue it.?

   Could such a weapon really exist?

To know.

  Although the German V1 missile in World War II was called a tracking missile, its actual body length was close to eight meters.

  The so-called guidance capability only relies on the magnetic compass.

  V1 missiles need to preset enough trajectory in advance to launch smoothly, and the acceleration at the end essentially depends on the opening of the spoiler.

  The same is true for the similar Fritz-X radio command guided bomb, which only relies on radio calibration.

   In addition, as far as Qian Bingqiong knows.

  The current international research on infrared guidance is similar, such as AIM-9 and AA-2 air-to-air missiles and so on.

   That is to say, it is not difficult to change the direction of the missile, but it is difficult to change the direction for the purpose of chasing the target.

   Almost all missiles these days are inseparable from manual calibration, which is known as shooting elements in later generations.

  But now Xu Yun has thrown out such a concept, and judging from Xu Yun's previous performance, he is obviously not a big talker.

   Could it be

   Is there really a door?

   After a while.

  Qian Bingqiong took a deep breath, forcibly calmed down, and asked Xu Yun seriously:

   "Comrade Han Li, what is the principle of this positioning device you are talking about? Can you introduce it to me?"

  Ye Duzheng waved to Lin Yu who was at the side, motioning for her to come forward.

   After all, it involves the concepts of radar and electromagnetism. Lin Yu is the only "insider" who has the highest attainment in this area on the scene, and the others are at most half a bucket of water.

   Xu Yun quickly picked up a pen and paper, and wrote a formula on the paper:

  △R=c/2B.

  Lin Yu took a look, and blurted out a few words:

   "Gaussian pulse?"

  Xu Yun nodded, affirming:

   "That's right, it's a Gaussian pulse."

   "B in the formula represents the signal bandwidth. The larger the bandwidth, the higher the resolution."

   Then he went on to write:

  f(t)=Ape^-(2πt/2α).

  P(f)=Ape^-(παf/2).

  Lin Yu also simultaneously gave the names of the two formulas:

   "This is the time-domain characteristic expression and frequency-domain characteristic expression of Gaussian pulse?"

  Xu Yun subconsciously prepared to snap his fingers again, but after thinking about the pain when doing this action before, he obediently replaced it with a thumb:

   "Bingo, it is not difficult to see from this formula that the pulse changes with the change of α in the formula."

   "The smaller the α, the smaller the pulse width, the larger the spectrum width, and the higher the resolution."

  “.”

  Lin Yu scanned the paper in front of him again for a while, and said thoughtfully:

   "I understand, Comrade Han Li, what do you think?"

   "Use some kind of special pulse signal for target identification?"

  Xu Yun nodded vigorously:

   "That's right, simply put a device on the missile that emits a narrow pulse and then receives the pulse signal scattered back by the target."

   "The device has a simple logical decision method to determine the target range by calculating the time between the transmission and reception of pulses."

   "At the same time, since this method directly transmits the baseband pulse signal on the fundamental wave, there is no need to worry about the signal being interfered by U2's radio jammer at all, and there is no need to worry about the accuracy."

  If it is not limited by physical injuries.

  Xu Yun actually wanted to show Qian Bingqiong and the others a bright smile like Matt Kay at this time, and then say, please give a good review, dear~

   That's right.

  The technology that Xu Yun brought out this time is exactly the "Old Su" in the military field of later generations, that is, the ultra-wideband proximity fuze technology.

  Why is it called Lao Su?

  The reason is that this technology is somewhat similar to Lao Su's reputation.

  Belonging to the insiders feels like thunder, but outsiders have some unknown skills.

   Look at it at first glance.

  Many people figured it was something to do with dial-up Internet access.

to be honest.

  When it comes to the concept of tracking missiles, another term may come to most people’s minds:

  Laser guidance.

   But actually.

  Laser guidance is actually very complicated, and its real operation method may not be as many people imagined, relying on the missile to lock the target and fly.

  Plainly speaking.

  Laser guidance is like making a missile walk a tightrope.

   That is, the laser irradiator first captures and tracks the target, and gives the angle information of the direction of the target.

  Then the missile launcher is controlled by the fire control computer to launch the missile at an optimal angle so that it enters the laser beam.

  The projectile is in flight.

  The laser receiver on the bomb receives the laser signal directly irradiated by the laser on the bomb, processes the error amount required for guidance, and sends this error amount to the bomb's control system.

  Then the control system controls the flight direction and attitude of the projectile, and always keeps the projectile coincident with the laser beam.

  Finally guide the warhead on the target.

   In the vast majority of cases.

   Most of the laser irradiators are on the aircraft or on the ground, and the seeker of the missile only receives the laser feedback from the irradiation.

   This is called semi-active laser guidance.

Of course.

  Semi-active laser guidance corresponds to active laser guidance technology. The irradiator is indeed placed on the missile body and controlled by the missile itself.

  But missiles with this type of configuration are generally huge in size, often more than ten meters long.

  So let’s not talk about whether the current rabbits can develop the parts needed for laser guidance.

  Just because of the volume and mass of the molded missile, it cannot be carried by a stratospheric aircraft.

   According to Xu Yun's design.

  That stratospheric aircraft can carry at most 4 missiles with a body length of about two meters. This length should be described more appropriately by shells.

   No matter how many, there is really no way.

  So this time Xu Yun gave up laser guidance and replaced it with ultra-wideband proximity fuze technology.

  Ultra-wideband proximity fuze technology is a guidance technology that has only been proposed in the past 30 years. The core is the principle of pulse ranging.

  Its principle is what Xu Yun said, to calibrate the target distance and azimuth according to the pulse signal.

  This technology does not require many modules, and it is somewhat similar to weather Doppler radar:

  It is mainly composed of transmitting\\receiving antenna, power amplifier, pseudo-random code generator, clock circuit, narrow pulse generator, sampling integrator, signal processing and other modules.

   First, the clock signal is encoded by a pseudo-random encoder to improve the anti-jamming performance of the system.

   Then drive the narrow pulse generator to generate a pulse signal, which is radiated by the antenna through the power amplifier.

  The target receives and returns the signal, through the receive antenna to the sampling integrator.

  The clock signal generated when transmitting will pass through a delayer at the same time-this delay determines the fixed detection distance.

   Then a delayed pulse is generated and fed into the sampling integrator.

   This pulse signal is compared with the received signal to lock the position of the target.

   After determining the target orientation.

  The change of the signal processing module changes the control of the pneumatic rudder surface to complete the steering of the shell.

  The whole principle is very simple and easy to understand.

   Then explained with Lin Yu's assistance.

  Qian Bingqiong and Ye Duzheng also understood Xu Yun's general idea successively.

   About twenty or thirty seconds passed.

   Qian Bingqiong pondered for a moment, frowned slightly, and continued:

   "I have another question—Comrade Han Li, according to what you said, a one-meter-long shell should not be able to accommodate these structures."

   "After all, in addition to the warhead, the shell also needs to be loaded with propellant that provides its flight kinetic energy. The mass is generally measured in kilograms."

   "If you add the modules you mentioned, it will probably far exceed the actual capacity of the shell, right?"

   "In this way, can the airship really bring them to an altitude of more than 20,000 to 30,000 meters?"

  Xu Yun shook his head lightly when he heard the words, and said to Qian Bingqiong with a smile:

   "Comrade Qian, with all due respect, you seem to have overlooked a very basic situation."

   "That is, our sniping environment this time is not ground-to-air, or even air-to-air in the standard sense, but"

   said.

  Xu Yun made a gesture from top to bottom with his index finger:

   "A 'bombing' similar to a free fall."

   Hearing Xu Yun's words.

  Qian Bingqiong was slightly stunned for two seconds, and then couldn't help but slapped himself on the head:

   "Oh, look at my brain, I almost forgot about it!"

indeed.

  Due to being too concerned about specific principles, Qian Bingqiong subconsciously ignored another thing:

  The floating position of the airship is much higher than that of the U2 reconnaissance plane.

  That is to say, a large part of the kinetic energy of the falling shell comes from its own gravity, instead of the initial energy provided by the propellant as usual.

   Therefore, as long as there is some steerable fuel inside the shell, the rest of the space can be completely freed up to place the ultra-wideband proximity fuze!

at the same time.

  Qian Bingqiong suddenly realized another point:

   Right now.

  After Xu Yun explained the volume problem.

  Three questions raised by Ye Duzheng before

   Already have all theoretically tenable answers!

  Think here.

   Rao is that Qian Bingqiong has presided over many major projects, and at this time, he couldn't help but feel a surge of turmoil in his heart.

   Murphy

  Can they really take down U2?

  (end of this chapter)