Century-old aircraft carrier, Indian aircraft carrierIndia's aircraft carrier development process had many unique features. After the Republic of India was established on January 26, 1950, it established a naval fleet. Although its national strength was limited, it was interested in the ability of aircraft carriers in the ocean and naval battles and was committed to realizing the "aircraft carrier dream."
India currently has two aircraft carriers, one of which is the Vikramatia purchased from Russia. The purchase price is $1, but the modification cost is $3 billion. On April 26, 2019, the Vikramatia caught fire, killing a naval officer. The other was the Indian ship, the Vikrant. The reason why the aircraft carrier Vickland would kowtow step by step during the trial was that the lack of a bulbous bow could not counteract the vortex, and the hull would rise and fall with the waves. Moreover, the staff of the aircraft carrier painted the deck as bright as a mirror, which was not conducive to the stable docking of the aircraft.
The Indian-made aircraft carrier was 260 meters long and 60 meters wide. It was equipped with four general LM2500 gas turbine engines with a total power of 80 megavolts. It was propelled by two axes. Its speed was expected to reach 28 knots. Its designed endurance was 7500 nautical miles and its self-sustaining power was 45 days. It was planned to carry a total of 30 carrier-based aircraft, including MiG-29K, Ka- 31 helicopters and Indian-made LCAs. It would take off and block the landing. The flight deck was equipped with two take-off and taxiing routes and three sets of landing arresting devices.
India faced many problems during the construction of the aircraft carrier. For example, the first prototype of the carrier-based "Glory" fighter aircraft failed to obtain flight approval due to structural problems, resulting in delays in the service period of the aircraft carrier. India had many shortcomings in the manufacturing of weapons and equipment, and these shortcomings were also reflected in the equipment related to aircraft carriers. Although its domestic aircraft carriers were in service, they had not yet formed combat effectiveness. India relied on imported many key equipment in the construction of aircraft carriers, such as blueprints from France and Italy, gas turbine from the United States, electronic systems from France, special steel from Russia, ship-borne air defense missiles and radars from Israel, and naval guns from Russia. The large L-band air warning radar came from Italy.
Now, India announced that it would build a third aircraft carrier. However, given India's past performance in weapons and equipment manufacturing, such as the inability to produce ammunition, poor quality, and misfiring in the production of the Insus rifle, the instability of the Arjun tank caused by the manufacturing of the Arjun tank, the high failure rate, and the difficulty of maintenance, as well as the unpredictable impact point of the Agni missile, the Indian Navy may lack confidence in building a third aircraft carrier.
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ocean carrierThere were many types of maritime transport ships with different functions and characteristics.
For example, a semi-submerged ship could adjust its own water to allow the loading deck to dive into the water, lowering the center of gravity of the cargo, reducing the inertia of the cargo itself and the impact of wind resistance and wave resistance on the hull, thus greatly improving stability. The cargo could float from the designated location to the loading deck and be transported to the designated location. Although most semi-submerged ships had power systems, they were rarely opened during operation. For example, Huayang 1 was towed by five tugboats during transportation, and its power was directly closed.
In terms of liquefied natural gas (liquefied natural gas) carriers, the 175,000 cubic meters of liquefied natural gas carriers developed and built by China's shipbuilding company, China's shipbuilding company, had a total length of 295 meters, a width of 46.4 meters, and a total cargo hold capacity of 175,000 cubic meters. The full-load transportation capacity could meet the needs of the entire Dalian City for one and a half months. It was the world's mainstream ship type and could dock at most of the world's large liquefied natural gas shore stations. It had excellent port adaptability and ship-shore compatibility.
Among the oil tankers, there was once the world's largest oil tanker, the Sea Giant, built by Japan. It was 458 meters long, nearly 60 meters wide, and had a displacement of more than 820,000 tons. However, in the context of the attack on the ship in the war between Iraq and Iraq, it was sunk by the MiG- 23 fighter jet of the Iraq Air Force on May 14, 1988.
There were also general cargo ships for transporting construction vehicles, such as the five-cabin four-crane general cargo ship with a length of 190 meters, a width of 32 meters, and a deadweight of more than 50,000 tons, which could carry construction vehicles and fuel tankers.
In addition, the 400,000-ton ultra-large ore carrier, Yuanjinhai, had a total length of 362 meters, a width of 65 meters, a depth of 30.4 meters, a structural draft of 23 meters, a speed of 14.5 knots, and a deck area equivalent to three football fields. It was a new generation of green, environmental protection, and energy-saving ultra-large transport ships.
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What is an objective question?An objective question was a question that required the answerer to provide objective facts or data. It did not involve subjective judgment or value judgment. For example,"Why does Lin Chong like his wife who is highly skilled in martial arts in the novel Water Margins?"
What is 'objective fiction'?Objective fiction is a type of fictional work that presents events, characters, and situations in a relatively unbiased way. It aims to show things as they are within the fictional world without overly influencing the reader's perception through the author's subjective opinions. For example, in a detective objective fiction, the author might simply present the clues and the actions of the characters without constantly telling the reader how to feel about each character.
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2024-11-05 16:05
Can comics be objective?In some cases, they can. It depends on the creator's intent and the nature of the story.
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2024-10-06 02:12
Is the content objective or subjectiveAs a fan of online literature, my answer could be objective or subjective. It depends on the specific situation of the problem and the information I have access to. For example, if I know the plot and character setting of a novel, my answer may involve these contents. If I know the evaluation and reader feedback of a novel, my answer may involve these contents. My answers will be based on my knowledge of online literature and my reasoning ability, and will not be affected by any subjective factors.
Are books objective or subjective?A book could be a record of an objective existence or an expression of subjective creation. In an objective book, the author only objectively recorded and described the facts and information he came into contact with without adding any personal subjective opinions or emotions. In a subjective book, the author would express his views and attitudes based on his subjective feelings, experiences, and values.
Therefore, books can be objective or subjective. They can be tools to record history, science, culture and other facts, and they can also be a way for individuals to express themselves, transmit information and ideas.
objective focal lengthThe focal length of an objective lens is an important factor in an optical system. There were many methods to measure the focal length of an objective lens. The fixed-focal length collimator method had a large measurement range and high accuracy. The relative error was generally less than 1%. It was a commonly used measurement method. In a telescope, the multiplying power was equal to the focal length of the objective lens divided by the focal length of the eyepieces. In terms of aperture, the F value was the ratio of the focal length of the objective lens (f) to the perimeter of the entrance pupil (D). Different types of telescopes or instruments had different focal length values of the objective lens. For example, the focal length of an astronomical telescope was 400mm, and the focal length of the objective lens of the ZWJ - 851 Collimator was 200mm.
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tumor objective responseThe objective response of the tumor could be seen from the values of tumor markers and imaging examinations.
** 1. Value of tumor marker **
1. ** Commonly used tumor markers and their normal reference values **
- ** Carcinoembryonic Antigen (Carcinoembryonic Antigen)**: Normal indicators should be less than 5 ug/L. It is a broad-spectrum tumor marker and is often used as a reference for cancer such as intestinal cancer, stomach cancer, breast cancer, or colonic cancer. If the indicator is more than two times higher than the normal value and continues to increase, it is necessary to pay great attention to eliminate the possibility of tumors. It may increase in cancer such as cancer of the intestine, stomach, lung, breast, uterus, etc. However, benign diseases such as digestive tract inflammation, polyp, lung inflammation, and long-term smoking may also cause a slight increase.
- ** Alpha fetoprotein (Alpha Fetoprotein)**: The tumor index of a normal person should be less than or equal to 25 ug/L. It is mainly used as a reference for primary hepatoma or gonadal embryonic tumor. When diagnosed with primary liver cancer, the positive rate in China was generally 60% - 70%. Normal people's serum levels were <20 ng/ml. When the serum levels of AFPs continued to increase by more than 500ng/ml for one month or more than 200ng/ml for two months, the possibility of liver cancer was highly suspected. However, in pregnancy, severe liver disease, liver Cirrosis, Testicular cancer, Entodermal cancer, teratoma, Ovary cancer, and gastric cancer with liver metastasizing, the serum levels of AFPs would also increase.
- ** Carbohydra Antigen 125 (CA125)**: It is a kind of protein. About 60% of patients with malignant tumors will have an increase in serum CA125, and it should quickly return to normal after surgery. Patients with relapse of malignant tumors often have an increase in serum CA125 before there is any relapse, which is a good indicator for determining the effect of chemotherapy on malignant tumors. However, some patients with malignant tumors do not have an increase in serum CA125. In addition to malignant tumors, there are also lung cancer, cervical cancer, uterus cancer, uterus cancer, gallbladder cancer, and gastric cancer. Cancer and other malignant tumors, as well as benign gynecological diseases (such as edema, uterus myoma, adenomyosis, Pelvic inflammation, and menstrual period) can cause it to increase to varying degrees.
- ** Carbohydrin Antigen 19 - 9 (CA19 - 9)**: It is more sensitive to digestive tract adenomas. More than 80% of patients with gallbladder cancer and gallbladder cancer have a higher level of CA19 - 9 than normal. However, the abnormal increase in these tumors is often in the late stage, and the value of early diagnosis is not great. The increase in stomach cancer, intestine cancer, liver cancer, breast cancer, olive cancer, lung cancer and other malignant tumors will also occur. At the same time, some digestive tract inflammation will also cause the increase in serum levels.
- ** Carborescent Antigen 15 - 3 (CA15 - 3)**: It has a certain value in the diagnosis, treatment, and follow-up of breast cancer. There are many cases of indicators rising in advanced breast cancer. It is a sensitive indicator of breast cancer, but the positive rate of the tumor is more than 70%, the positive rate of lung cancer is 50%, and the positive rate of digestive tract tumors is 10% - 20%.
- ** Carborescent Antigen 72 - 4 (CA72 - 4)**: It was considered to be one of the best tumor markers for the diagnosis of gastric cancer in the past. It had a high degree of specialization for gastric cancer. If it was combined with CA19 - 9 and CeA, it could monitor more than 70% of gastric cancer. However, in actual application, the directional effect was poor. Its abnormal elevation might not necessarily be a malignant tumor. It could be caused by chronic inflammation of the digestive tract, infection, fatigue, cold, and fever.
- ** Prostate-specific Antigen (PVP)**: An important tumor marker for the occurrence and outcome of bladder cancer. The normal reference value of serum PVP is <4ng/ml, and 4 - 10ng/ml is the range of suspected bladder cancer.
- ** Neuron specific enolase (NSe)**: It is one of the important markers of small cell lung cancer. The normal value is <16.3 ng/ml.
2. ** The significance of tumor marker values **
- The increase or decrease of tumor marker values might indicate the deterioration or improvement of cancer, but the increase or decrease of values was not always proportional to the deterioration or improvement of tumors. Many other factors would also affect the values, so the long-term trend of tumor marker values could better reflect the effects of chemotherapy or other treatments.
** II. Medical imaging examination **
Medical imaging was also an important objective method to reflect the condition of the tumor. For example, through X-rays, CT, MRI, and pet-CT, one could observe the size, shape, location, and relationship with the surrounding tissues of the tumor.
- ** X-ray examination **: It can initially detect tumors in the lungs and other parts. It can show the approximate outline and location of the tumor, but the ability to distinguish some smaller tumors or soft tissue tumors is relatively limited.
- **CT examination **: It can provide more detailed cross-section images, and can make more accurate judgments on the size, density, and relationship with surrounding organs of the tumor. It can help to detect early tumors, determine the stage of the tumor, and evaluate the possibility of surgical removal.
- **MRI examination **: The ability to distinguish soft tissues is better than CT. It has a unique advantage in the diagnosis of tumors in the brain, spinal cord, muscles, joints, and other parts. It can clearly show the internal structure of the tumor and the infiltration of the surrounding tissues.
- ** POT-CT examination **: Not only can it show the anatomical structure of the tumor, but it can also reflect the tumor's metabolism activity. It is of great value for early diagnosis, grading, efficacy evaluation, and finding the primary and metastasized tumor.
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A hundred-year-old aircraft carrier, a Soviet aircraft carrier.The development of the Soviet aircraft carrier witnessed the efforts and changes of the Soviet Union in the construction of naval forces.
During the Cold War, the Soviet Union vigorously developed its navy to compete with the United States for maritime hegemony. The construction of aircraft carriers became an important part of its naval strategy. In its heyday, it had nine aircraft carriers. However, due to the excessive emphasis on military industry, the Soviet Union's economic structure was unbalanced and eventually disintegrated, which had a huge impact on the fate of its aircraft carriers.
After the collapse of the Soviet Union, the legacy of the aircraft carrier was divided by the successor states, and the economic situation of each successor state became a key factor in determining the fate of the aircraft carrier. Russia inherited the Kuznetsov aircraft carrier. Although it was in poor condition and needed frequent maintenance, it was of great significance to the Russian Navy. Russia hoped to return it to its peak through modernisation to maintain its position in the global naval force.
Ukraine took over the Varyag and Ulyanovsk. The Varyag was not completed when the Soviet Union collapsed. It was sold to China because of the lack of funds and technology in Ukraine. After modification, China named it the Liao ship and equipped it with the navy. The Ulyanovsk was the first next-powered aircraft carrier that the Soviet Union intended to build. It was eventually dismantled due to the interruption of the construction plan of the Soviet Union.
Novorossiysk was purchased by South Korea and dismantled into scrap metal in 1997. After the Baku was sold to India, it was renamed the Vikramatia. India upgraded it to become the main aircraft carrier of the Indian Navy. The Minsk and the Kyiv were transformed into theme parks in China's Tianjin and Tianjin, respectively, transforming from war tools into cultural tourism carriers.
In the early years of the Soviet Union, other aircraft carriers were explored. For example, in the 1960s, the Soviets began to design and develop the Moscow helicopter carrier, which was the first attempt in the field of aircraft carriers. It had a full displacement of more than 20,000 tons. In the 1970s, they developed the Kiev-class aircraft carrier, a total of four, belonging to the 40,000-ton class aircraft carrier. In the 1980s, they began to develop the Kuznetsov-class aircraft carrier, a total of two, a 60,000-ton aircraft carrier.
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