Justo después del amanecer del 22 de mayo, Facebook alcanzó otro hito emocionante e importante en el proyecto Aquila –completamos exitosamente nuestro segundo vuelo a escala real de la aeronave–. Esta voló por 1 hora y 46 minutos y aterrizó a la perfección en nuestro sitio designado.
Para poder lanzar la aeronave antes del amanecer, que ese día fue a las 5.15 a. m., estábamos en la entrada del Campo de Pruebas Yuma (YPG) en Arizona desde las 12.30 a. m. Mientras que unos miembros de nuestro equipo empezaban a abrir el hangar y levantaban la aeronave hasta su base de despegue, el resto de nosotros preparábamos las estaciones de control en tierra e ingeniería. Prácticamente todos revisamos las predicciones sobre vientos, constantemente.
El segundo vuelo de Aquila tuvo en cuenta todas las lecciones aprendidas durante nuestro primer vuelo. Antes de este, incorporamos una serie de cambios a Aquila que incluyeron:
La adición de spoilers a las alas, que incrementan resistencia y la propulsión en el acercamiento al aterrizaje.
Incorporamos cientos de sensores para recolectar más datos
Modificamos el software de piloto automático
Integramos nuevos radios al subsistema de comunicaciones
Cubrimos la aeronave con un acabado más liso
Instalamos un mecanismo de detención del propulsor horizontal para poder tener un aterrizaje exitoso.
A las 5-27 a. m., cuando el sol estaba apenas encima del horizonte comprobamos que la aeronave pasara todas nuestras verificaciones anteriores al vuelo: los vínculos de radio (redundantes tanto para la carga como descarga y con ancho de banda extra) eran funcionales, las superficies de control y los spoilers estaban libres y eran correctos y los cuatro motores respondían adecuadamente a los comandos.
Tras completar nuestra lista de verificación anterior al vuelo, nuestra corta espera fue premiada con poco viento medido y poco viento en las predicciones del clima. Un breve sondeo de nuestros pilotos e ingenieros nos dio luz verde para el lanzamiento. La velocidad de despegue estuvo calculada en 43.45 km/h, lo que notificamos a nuestro remolque. El equipo observó de cerca todas las pantallas, esperando la seña que confirmara que el piloto automático hubiera tomado el control y que la aeronave ya estaba subiendo, lejos de su base de despegue.
El lanzamiento fue normal. También se hizo evidente prontamente que todos los sistemas funcionaban normalmente: la corriente del motor, el seguimiento a la velocidad del aire, los indicadores de dirección, vínculos de radio y GPS diferenciales mostraban todos comportamientos normales. La única sorpresa que tuvimos fue del tipo alegre: la tasa de ascenso –54.86 mt/s– fue casi el doble de la de nuestro primer vuelo, lo que atribuimos a los múltiples ajustes de Aquila –puntualmente el acabado más liso– que implementamos desde el primer vuelo.
Así, continuamos nuestro ascenso hasta los 914 metros, esperando todas las señas que mostraban el buen estado de la aeronave antes de que esta excediera nuestro rango de vuelo planeado. Con todas las telemetrías “en negro”, continuamos subiendo. Por diseño, Aquila se toma su tiempo: asciende lentamente, desciende incluso más lento y cuando vuela con el viento no lo hace a más de 16-22 km/h respectivo al suelo. Hemos diseñado Aquila de esta forma porque su fin es quedarse en la misma zona por largos periodos de tiempo proveyendo acceso a internet. Aquila se alimenta de energía solar y es extremadamente eficiente –funciona con la electricidad equivalente de tres secadores de pelo–.
El segundo vuelo se trataba solo acerca de datos. Volamos para surtir largas pruebas a una velocidad, inclinación y altitud constantes para medir la resistencia de la aeronave. Los datos de estos “trim shots”, como los llamamos, serán usados para refinar nuestros modelos aeronáuticos, lo que nos ayuda a predecir mejor el consumo energético y, así, optimizar el uso de nuestras baterías y la ubicación de los paneles solares. También instrumentamos extensamente la estructura del avión, agregando cientos de sensores a este para entender cómo la forma de Aquila responde al vuelo en tiempo real. Estos incluyendo cientos de medidores de esfuerzo y tres ejes de medición de inercia (IMU). Estas herramientas nos sirven para verificar y refinar nuestro modelo estructural, lo que predice la firma estática de la aeronave –además, diseñada para ser muy flexible y responder tanto a los vientos como a las maniobras–.
Durante todo el vuelo, continuamos monitoreando la resistencia creada por los nuevos spoilers de Aquila en diferentes ángulos. Estos spoilers son estructuras móviles en el ala de una nave que le permiten incrementar la resistencia para reducir la velocidad y la propulsión. También probamos la fuerza de señal de los dos vínculos radio desde varios puntos angulares.
Después de probar el algoritmo de aterrizaje con una versión elevada, hemos puesto la nave a hacerlo de forma completa, y exitosa, en el lugar designado.
Aquila no tiene un mecanismo de aterrizaje en el sentido tradicional. En cambio, aterriza sobre bases de Kevlar unidas a la parte baja de las cápsulas del motor. Nuestro razonamiento para esto se debe a dos razones: primero, aterrizamos a una velocidad respecto al suelo y nos acercamos al suelo de forma muy lenta, para que podamos disminuir el peso y la resistencia en las riostras y ruedas; y, segundo, porque mucho del peso de la aeronave está concentrado en las cápsulas del motor, pues es acá que están instaladas las baterías. Una vez las baterías han tocado suelo, detener el descenso del resto de la aeronave no representa un gran esfuerzo para la estructura.
Para la base de aterrizaje creamos un círculo de 152 metros de gravilla de unos 15 centímetros de profundidad con la consistencia de arena gruesa. El vuelo de Aquila es autónomo salvo por intervenciones manuales, como las necesarias para alinearse con el viento. Por lo tanto, justo antes del aterrizaje, el equipo de vuelo carga un plan de aterrizaje basado en la dirección del viento para que la aeronave aterrice con el viento y respetando el límite de vientos cruzados.
Al aterrizar Aquila sigue un camino de descenso con inclinación de 3 grados que empieza en el aire y termina en el piso. Una característica de este tipo de aeronaves es la baja resistencia –es la única forma posible de volar con la energía limitada que provee la luz solar–. Pero mientras la resistencia es el archienemigo del vuelo, ella es la primera aliada del aterrizaje. Los spoilers que agregamos a la aeronave son controlados por el piloto automático. Cuando este siente que la nave excede la inclinación, cierra los spoilers. Cuando siente que está pode debajo, los abre más. Mientras tanto, como durante todo el vuelo, el piloto automático sube y baja su punta usando elevons, que ayudan a incrementar o reducir la velocidad de vuelo.
A unos segundos del aterrizaje, el piloto automático detiene los motores del avión y los bloquea automáticamente. Se bloquean así para evitar dañarlos durante el aterrizaje. Todos los motores están detenidos, pero solo uno de los propulsores está horizontal. La aeronave hizo contacto gentilmente en la superficie de aterrizaje y se detuvo en unos 10 metros. Fue absolutamente perfecto. Igual que cuando se conduce un auto en gravilla, aterrizar la aeronave en este material causa apenas unos pocos y fáciles de reparar rayones. En todos los otros aspectos, Aquila aterrizó en la mejor forma.
Desde nuestra estación de ingeniería, en las cercanías, el equipo de Aquila vimos una transmisión de video que nos mostraba la vista desde el aire, tomada por nuestro helicóptero de seguimiento. Tuvimos asientos de primera fila para ver a la aeronave deslizarse suavemente hasta la quietud en una nube de polvo –y ver a la estación de ingeniería levantarse en aplausos–. Después del aterrizaje de Aquila, el equipo de YPG informalmente bautizó el área de aterrizaje como “Playa Aquila” –¡nombre que nosotros estuvimos orgullosos de adoptar!–.
Sobra decir que el equipo entero estaba sumamente feliz con estos resultados. Nuestro objetivo de conectar a la gente con aeronaves de vuelo a gran altitud y con energía solar es valiente, pero hitos como el marcado por este vuelo hace que meses de arduo trabajo valgan la pena. Por eso, es particularmente gratificante, que las mejoras hechas según el desempeño de Aquila en su primer vuelo hicieran una diferencia significativa en este segundo vuelo.
El Internet Industrial de las Cosas (IIOT) ha irrumpido como una fuerza transformadora. El gasto global en plataformas IIOT se ha disparado, pasando de 1.700
Las PyME y los pequeños contribuyentes son, en este punto, los más afectados, pues al no prevenir con tiempo estos gastos tendrán que desembolsar una fuerte cantidad, de un día para otro, para tener dichas actualizaciones.
La principal función de un sistema de administración es gestionar y controlar los recursos, procesos y operaciones del negocio, por lo que es fundamental integrar la facturación electrónica a este sistema.
Isn t this putting the responsibility on himself Although Ban Xian er has a dark heart and wants a bit too much.I have heard all about you. It s almost time to wake up, it s been a long time since I met this outstanding young man like you.
Although Zhang Dewen is a Chinese medicine doctor, this old man s reputation in the hospital is too high, his qualifications are too deep, his age is too old, and his level is not bad.Zhang, you make up your mind, we all listen to you.
Yes, the pressure on the young man is still great. At this moment, the girl no longer wanted to ask Du Heng to explain to her.How long do you think she can move around in such a dense old forest Du Ping said.
Looking at his junior s embarrassed smile, Du Heng smiled again, Tell me what happened to Dr.Du Heng quickly recorded what Section Chief Song said, then read it carefully from the beginning, then raised his head and asked, I have been sick for such a long time.
He just looked at Tang Yinglong with the same cold eyes and asked, Just tell me whether you can help me or not Looking at Guan Bo With Bo s arrogant expression, Tang Yinglong trembled with anger, Help How can I help you He pointed at his computer screen angrily, Look at the stupid things you have done.
Today he couldn t bear it anymore, so he came to let me take a look again.The money you have earned during your lifetime is probably only a fraction of this number, right When Du Heng earned fifty thousand, he could still talk to him and educate him when his brother earned one hundred thousand or two hundred thousand, he could also give him some advice but when he saw these seven figures, he felt that he Suddenly he was speechless.
And Guan Bo has indeed achieved his goal. All the online social accounts have increased by tens of thousands of people from only a few hundred people in the past.And this is not the time to get angry, Du Heng Taking a deep breath, Now, moving the event to the conference room, we can t hope that God won t rain.
It is indeed the solution they proposed on their own initiative.These chairs are placed here. Your child bumped into them by himself.
But what can be done now that the matter has come to this, Du Heng can only tell the story honestly.He has no time to spend his energy on the turbulent Internet, let alone student forums.
As for the profession of bone setting, there are not many people who know it, and even fewer who are proficient in it.But now he is placed in the Department of Gynecology and Medicine, which has nothing to do with the Department of Traditional Chinese Medicine.
This was not because he had just criticized Wu Buwei and Du Heng did not give him face, but after examination, he found that the doctor s diagnosis of the patient was specious and the cause of the disease was wrong, but he was angry because he refused to admit it.If I had looked online earlier, you would have been able to stop Brother Guan from coming here.
Xiao Jin, stop calling, I m here. The old man said as he picked up the phone in his hand, Xiao Jin, who is Dr.Do you think you will get the medicine for this prescription, or shall we do it Du Heng He quickly said politely, Hello, Director Zhang.
And my right hand is good. I can cook and change clothes with one hand.Your mother is old and the gas smell is so strong. She can t insist on us bringing the money.
Du Xueting glared at Du Heng unhappily, You are a straight man, I will teach you how to make a girl happy.Jin Zan s words made the couple, who had just smiled, freeze again.
Du Heng ignored what the psychiatrist said, but looked at Zhang Dewen and said softly, Mr.I have face, and there are a lot of benefits, and I have passed From the follow up exchanges, maybe you can get some more benefits, so why not do it.
During the meal, Kang Zhirong diligently served Du Heng meals, but Du Heng refused them all.Xu Pinglin also got off the donkey and continued, Let me tell you about the patient s condition first.
I ve been feeling sick to my stomach for the past two days and I don t want to eat.When he saw the bill collection text message, Du Ping s eyes were as wide as bull s eyes.
Moreover, Vice President Qiao, the chief negotiator, will report these matters to Du Heng every few days, and then go to the committee of the college.Du Heng still smiled slightly, and with a warm smile, he asked the young mother not to be too excited and sad, Listen to me, put the child down first, and tell me if you have any problems.
Du Ping also seized the opportunity and kept scolding him until his mouth was dry and he didn t stop.Why do you just listen Where are the words two or three years Haha, Xiao Yu, you were not hospitalized there.
When you feel strong again, if If you re not in a hurry to go back, you can come to the hospital to study with Tingting.Li Shuxun said to Du Heng, Brother, come to the office and sit down for a while.
This time Zhang Dewen became interested again. Of these ten cases, he could give Guan Bo Having done off site coaching, he knew it was a bit difficult.If he didn t finish them, he would have to work overtime to read them.
After placing Du Da s mother in the yard, Du Fei turned around and rushed in again.You are my assistant, why can t you do it Just go ahead and get it done.
It is reasonable for Li Jianwei to deal with him. Hey, but the school is interesting enough.If I don t see the money in another three minutes, I will light the fire.
Du Heng also became serious after listening to it, and after a while he said, I don t know much about economic development, and I don t know if it can be done.So we need to know where does the patient s strong fire and wind come from If you don t solve this problem, just soothing your nerves will be like taking sedative drugs prescribed by Western medicine.
My teacher called just now and you heard it. They are still waiting for me in the office.After reading this, Du Heng couldn t help but sigh, Ginger is still spicy.
The only thing he s worried about now is what stage the disease has reached.
Seeing the couple walking away, Jin Juan took out her phone and dialed Lu Guangying, Director Wu and the others want to treat me to dinner.
You re back home.
That works, I get it.
I ve made arrangements for me tomorrow.
Hello Jin Juan walked out while making a call. She glanced at the cell phone whose screen suddenly went black.
There are handcuffs and mobile phones inside. Get it for me, quickly.Some drugs are used to activate blood circulation, remove blood stasis, and disperse qi, which are very unfriendly to the fetus.
Du Ping silently took out a cigarette and thought of talking to Wu Shengnan s father.Find a place to put me down. You go and get ready. Meeting the parents is a big event. talking about marriage is an important matter and cannot be taken lightly.
What a careless parent. Then he didn t stay any longer and hurried back to his clinic.But who knows, the crowd suddenly retreated, and before he could react, the woman was hit.
She reached out to her husband next to her and said, Hurry up and get the milk powder.Especially when Wu Shengnan in police uniform passed by and glanced at him lightly, the two people who looked like repeaters immediately became quiet, each took a step back and sat back down.
After hearing what Du Heng said, Professor Zhang was not angry, but asked with interest, Doctor Du is also doing science popularization online, that s good.
Some of my students have also given me this suggestion, but for some reasons, they have not done it yet.But what he didn t expect was that after almost ten days of delay, news finally came about Wei Kaida s paternity test, asking him to get the test results.
The more I look at it, the more it looks like a weapon.Director Liu wanted to ask again, but Du Heng interrupted her with a wave of his hand.
Of course, if conditions permit, you can also poison, set fire to, or perform a beheading operation.And they This kind of reaction is also a habit that has been developed for a long time.
At that time, you won t even have time to cry. Mom, where are you from Nowadays, technology is so advanced that you can have a baby even at the age of fifty with some medicine.Angry. Du Heng did not express his opinion on this answer, and then looked at the last female doctor, What about you The female doctor smiled sheepishly, I think there is no problem.
Please, you must vouch for it this time. You can save a dying person, my brother This problem should be a piece of cake for you.Liang Lihai looked at Du Heng, then took the cup and drank, Okay, come on.
Red tongue and yellow coating indicate severe heat.If he, Mei Dong, doesn t make some gesture now, it means that they will look down on Du Heng as a whole.
Then I went to see the child with hepatitis, and this child s face was rosy and his whole body was active.I want to prescribe a prescription. One is to induce vomiting, and the other is to protect the meridians.
Du Heng suddenly understood. What he said was too foreign to respond.Du Heng didn t say it clearly, but everyone knew who he was talking about.
It was also at this moment that he realized more clearly how strong the doctors and nurses working here were.Dr. Du, you are not only a doctor, but also the director of the hospital.
The navel is known as the Divine Palace, which is the place where the vitality of the human body gathers.He can be sure that he is popular, but it should be black and popular.
This is the experience summarized in the past year.Zhen Ken feeding chair Yi Zun low Nan presses the roof to Ken Lane and just Feeding Nan chatting Spinning Nan Guo Fu Pillow Kill rateRemember the true water, the bamboo shoots in the south, the mud, the sweetness, the south reclamation, the dragging, the taboo, the south sound bundle, the openness, the sweetness, the hungry south, the chrysanthemum wall, the corpse, the chrysanthemum wall.
Du Heng arranged a few more sentences and left the ward with Li Jianwei.Gu Ping s eyes were full of hope, Teacher Du, how is the patient s condition Du Heng breathed out softly, and immediately told his diagnosis, But the patient has been ill for more than ten years, and all treatments have failed.
But he was just surprised for a moment, Teacher Du, have you prepared the prescription Du Heng chuckled, You knocked on the door just when I thought about it.Du Heng nodded and agreed. Although he felt that this matter was troublesome, he didn t say anything else.
Wu Shengnan pouted and admitted his mistake, I won t do it next time.That s really not expensive. Wu Shengnan s father nodded with satisfaction.
Zhang, don t mind. Hehe, Once again, I returned Zhang Dewen s words, feeling comfortable.Du Heng raised this question, which made him, the captain of the first team, very unhappy and holding back his anger, Why Captain Zhang, don t be angry first, just listen to me.
Isn t the matter a bit far away After hearing what Du Heng said, Wu Shengnan s attitude softened and he murmured softly, It s not that you can t do it.The purpose of his visit was not for the stars, but because the report said that cervical cancer can be treated without surgery for women and children in the city.
Lu Guangying was also angry at such a person who was indifferent between good and bad, Why, just because Gao Qin is in the free clinic team and Lao Cao is also in the free clinic team, they don t need to go to the two departments.Those who thought they had a good relationship with their leaders either took out their mobile phones or ran to the offices of their leaders.
Doctor Du, wait, I have something to tell you. The tall assistant suddenly stopped Du Heng.During the Chinese New Year, this kid still existed among Gong Daoyang s group of people who cracked down on gambling.
Then he clapped his hands and stood up, standing in front of Wu Shengnan with a calm expression, waiting for her decision.Du Heng glanced at it casually, looking at the quotation above, and was secretly speechless.
Senior brother, do you have a staff at your place Xiao Su suddenly asked again as he originally thought the topic was over.Refresh yourself and relieve fatigue. Is this the beginning of a conversation Du Heng pretended to take a sip, and it seemed to be similar to his own tea worth one or two hundred yuan.
Anyone who sees this scene will know that this middle aged man has reached the limit of his body.While Wu Shengnan was waiting for Du Heng to come back, he kept scrolling through his cell phone.
Gu Ping s eyes were full of hope, Teacher Du, how is the patient s condition Du Heng breathed out softly, and immediately told his diagnosis, But the patient has been ill for more than ten years, and all treatments have failed.To this. Shen Changqing has become accustomed to it.
Unlock and open the door. Du Heng once again entered the house where Wang Shuqiu and her uncle had quarreled and Zhao Xinfang had fallen ill.Du Heng smiled and drove away without saying anything.
There are only two or three big cats and kittens in the obstetrics department.If she knew, she didn t know if she could hold on without fainting.
They don t want to let themselves appear without any luster.As soon as Du Heng said these words, Xu Pinglin next to him immediately let out a sigh of relief.
He had not seen this comment before. He immediately put down Director Zheng s cell phone and took out his own cell phone to start operating.But they didn t pay a penny out, they just wanted to get a big advantage.
Tell us what you think about the child s name, or who you support I don t support anyone, so I can choose whatever you want.Wei Kaida He was not amused by Du Heng s words, but said with a melancholy expression, None of them.
Before setting off, Du Heng felt as anxious as if a cat had taken over.Seeing Wang Shuqiu s father s careful look, Liao Yuzhu also knew what the problem was.
Even when it was the college entrance examination, and even when he was making trouble to visit Xiao Ying who jumped off the building, Du Heng never had such an expression.Du Heng was a little confused, What did I agree to The Municipal Criminal Police Detachment sent a letter asking you to go to their unit for a physical examination.
The colleague nodded in agreement. Similarly, he also knew the last sentence that Gong Daoyang did not say, that is, not a penny more.Have you forgotten why you made trouble in my house That s what you said Are you telling the truth Zhao Qiang was still the same.
However, before Wu Buwei said a few words, the noise outside became louder and louder, and judging from the tone, it didn t look like family members coming to pay fees or patients asking questions.Now, no matter how young Du Heng is, he has become their last life saving straw.
Du Heng was not in a good mood at this time and leaned on his chair.I ll send you there tomorrow. You can get used to it first, so as not to be unable to sleep at night and affect your exam.
Xiaoying, what s wrong with you Don t scare mom. The woman hugged the girl and squatted on the ground, crying and shouting loudly, but the daughter in her arms didn t respond at all.There was nothing the emergency doctor could do. Now I can only give him infusions and then send him to the hospital for treatment.
Du Heng also noticed Wu Buwei s nervousness, and took the initiative to help him share some of the work, and tried his best to provide him with some conveniences so that he could have more time to review.The young man s voice was very soft, You came out on your own.
Doctor Du, how much does this cost Can we buy something at home to replenish it As soon as these words came out, Du Heng knew what Wang Shiyuan was worried about.Lu Zhongjiang also smiled, That won t be easy. If the time comes, the bureau will arrange it directly.
I seem to understand, but I don t seem to understand.Take two more The course of treatment, that is, fourteen doses of medicine, is still twice a day.
Deng Jia digested Du Heng s words, then looked around blankly, You brought B ultrasound here How is that possible You re trying to steal time.Now Du Heng s visit to the Department of Digestion is almost like coming to his own home.
Du Heng really didn t care. If you can be optimistic about it, it is indeed a show off thing.He endured it again and again, but luckily he didn t laugh out loud, Then wait for me, we ll leave right away.
Okay. I know. Excuse me, Ms. Zhou. Du Heng breathed a sigh of relief without having to go to the court hearing.During the journey from picking up the little girl from the car to the ward, the family kept saying thank you to Du Heng, which made Liao Quansheng roll his eyes at Du Heng from behind.
Du Heng didn t listen to sister Liao Quansheng complaining and complaining about all kinds of regrets, but went straight to the little girl.An aggressive look. Now looking at the dark faced Gong Daoyang sitting aside, I felt even more panicked.
Didn t you have breakfast It almost happened. When I first came here, he was preparing to eat steamed buns.These animals secretly spent several thousand yuan on him yesterday.
I don t know if it will be the same when I come back tomorrow.But among the people present, except for Du Yi who was dumbfounded and didn t understand, the others all had their eyes widened.
In the past, when students didn t understand and didn t know how to do the questions, I would patiently explain them to them.We can t If you delay any longer, we will go to the capital to find experts tomorrow.
Every family has to live, and it is impossible to help his family.Then tell them all. Du Heng organized his words slightly, Yang Yuansheng s situation, from the current family income, is nothing.
As he said that, he took over the few Chinese medicine prescriptions next to him and said, Have you read these prescriptions They are all prescriptions to calm the mind and calm the mind.After the disinfection was completed, everyone stood together and began to register and hand over the epidemic prevention work.
Seeing the banner in this man s hand, everyone except Du Heng became more excited.After a night of silence, Du Heng called the nurse on duty before the sun rose the next day.
Por Martín Gómez | Blogspot Facebook.