雖然這篇Linearly correlated鄉民發文沒有被收入到精華區：在Linearly correlated這個話題中，我們另外找到其它相關的精選爆讚文章
在 linearly產品中有4篇Facebook貼文，粉絲數超過0的網紅，也在其Facebook貼文中提到， 【科普文分享】逾 80 年來首確認光子高速碰撞 可產生物質與反物質／小肥波 ／／上月尾刊於 Physical Review Letters 的研究指，美國 Brookhaven 國家實驗室成功用相對論性重離子對撞機 (RHIC) 直接觀察到 Breit-Wheeler 過程，即光子可通過強力撞擊結...
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【科普文分享】逾 80 年來首確認光子高速碰撞 可產生物質與反物質／小肥波
／／上月尾刊於 Physical Review Letters 的研究指，美國 Brookhaven 國家實驗室成功用相對論性重離子對撞機 (RHIC) 直接觀察到 Breit-Wheeler 過程，即光子可通過強力撞擊結合，變成物質與反物質。
Breit-Wheeler 過程在 1934 年由物理學家 Gregory Breit 和 John A. Wheeler 首次提出，理論指兩個光子可通過強力撞擊結合，有可能變成物質與反物質，形成電子和正電子。這種把光變成物質的過程是愛因斯坦狹論相對論中質能方程式 E=mc² 的直接反映，表明能量和質量是可以互相轉化。長期以來，學界都期望通過超強功率的激光碰撞來觀測過程，然而兩個光子發生碰撞的概率非常低，其所需的最低激光功率仍然比目前功率最高的激光系統要高幾個數量級。
有参與研究的 Brookhaven 國家實驗室物理部教授許長補指，當年 Breit 和 Wheeler 提出理論時，激光還未被發明，他們提出替代方案，通過加速重離子到相對論能區並碰撞來實現光生物質， RHIC 正是為此而設。
RHIC 啟動後會加速離子，電子會從元素的原子核剝離。由於電子帶負電荷而原子核內的質子帶正電荷，將電子剝離會使原子核帶正電荷。元素越重，擁有的質子越多，生成的離子正電荷就越強。
團隊使用了包含 79 個質子和強大電荷的金離子做測試。當金離子被加速到非常高的速度時，會產生一個圓形磁場，強度可以與對撞機中的垂直電場一樣強大，兩者相交的地方，出現相等磁場可產生電磁粒子或光子。許解釋，當離子以接近光速的速度運動時，金原子核周圍會有一堆光子，像雲一樣隨其移動。
在 RHIC 中，金離子會被加速到光速的 99.995% ，即使兩個離子彼此錯過時，產生的光子雲仍可互動碰撞；雖然無法檢測到碰撞本身，但產生的正負電子對可以顯示碰撞曾經出現。然而，僅僅檢測正負電子對並不足夠。因為電磁互動作用產生的光子是虛擬光子，會短暫地出現和消失，並且沒有與「真實」對應物相同的質量。
為了完全確認 Breit-Wheeler 過程出現，團隊分析了 6,000 多對正負電子的角度，比較每一電子對的質量和角分布是否與理論所上的光子碰撞一致。另一参與研究的物理學家 Daniel Brandenburg 補充，團隊也測量了系統的所有能量、質量分佈和量子數，確定如 Breit 和 Wheeler 最初預測一樣，光子碰撞可直接產生物質與反物質。
來源：
Science Alert, Physicists Detect Strongest Evidence Yet of Matter Generated by Collisions of Light, 10 August 2021
報告：
Adam, J. Adamczyk, L., Adams, J.R. & et al. (2021). Measurement of e+e− Momentum and Angular Distributions from Linearly Polarized Photon Collisions. Phys. Rev. Lett. 127, 052302 – Published 27 July 2021. doi: 10.1103/PhysRevLett.127.052302
文／Alan Chiu／／
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The End of a Thing is Better than its Beginning
“For there is a time and procedure for every purpose, although the misery of man is heavy on him. For he doesn’t know that which will be; for who can tell him how it will be?” (Ecclesiastes 8:6-7 WEB)
When God carries out a purpose (what) in your (who) situation (where), there is a time (when) and procedure (how).
In tough times, we tend to worry as though God has forsaken us because we can’t see the future that God has planned for us.
When we read a storybook, we progress linearly, one page at a time. When you’re reading the page where the villain is having the upper hand, you worry for the protagonist because you don’t know about the great victory that the author has written for him in the following chapters.
God can reveal the future to you, but sometimes He doesn’t because He wants you to experience His great power by rescuing from a seemingly impossible situation.
“Better is the end of a thing than its beginning. The patient in spirit is better than the proud in spirit.” (Ecclesiastes 7:8 WEB)
Trust that God has written a great story for you—one where you win in the end. See your life as a compilation of many short stories where you are always the main character.
In every story, you emerge as the final victor. But there’s bound to be a problem before the resolution. Trust the Author of your life.
The patient in spirit is better because he is the protagonist who goes through many trials at first. He has to patiently endure and wait for his final victory.
The proud in spirit is the villain who resorts to underhand tricks and evil schemes, but just as he’s about to win, God will disappoint him and utterly destroy his plan.
The devil thinks he’s writing your story. He has devised many traps for you. But God is the one who holds the master pen. For every evil plan, God has already prepared a great deliverance and generous restoration for you.
“Your eyes saw my body. In your book they were all written, the days that were ordained for me, when as yet there were none of them.” (Psalms 139:16 WEB)
God has already written your story, from the beginning to the end. He doesn’t control your choices, but He knows how you will respond in each situation, and He inserts His interventions at appropriate points to lead you to your victory.
These are His appointed times. The moments where He steps in to shame your enemy and win the battle for you.
You will feel safe and secure when you know that God has already written your story. He is not responding only after each new situation happens. Things are just playing out the way He has planned it.
Have strong encouragement because the end of every short story concerning you is better than its beginning!
God makes everything beautiful in its time. Believers fall into frustration, burnout and turn their backs on God because they do not understand the truth of “God’s Appointed Time”. Understand His system of times and seasons, and learn to be fruitful in every season: https://www.miltongoh.net/store/p23/gods-appointed-time-milton-goh.html
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Với những người mới tập, việc điều chỉnh mức tạ sẽ không cần phải quá phức tạp. Đơn thuần là bạn cố gắng làm nhiều hơn qua mỗi buổi. Song, có chút sự khác biệt liên quan đến cấu trúc của bài tập, giới tính và kinh nghiệm tập luyện.
VỀ CẤU TRÚC BÀI TẬP:
Các bài sử dụng nhiều khớp cùng một lúc như Squat, Bench, Deadlift sẽ tăng tạ nhanh hơn các bài tập đơn khớp. Trong khi các bài đa khớp có thể tăng 2.5 - 5kg, thậm chí 7.5kg mỗi lần, thì các bài đơn bạn chỉ nên tăng 1-2kg mỗi lần nếu không muốn bị chững tạ sớm.
Các bài tập thân dưới thường sẽ tăng được tạ nhiều hơn so với thân trên. Trong khi với người mới tập, Deadlift mỗi buổi có thể tăng tới 7.5kg, Squat tăng 5kg mỗi buổi, thì Bench Press có khi lại chỉ là khoảng 2.5 - 5kg mỗi buổi.
Thường thì tốc độ tăng trên với người mới tập sẽ giảm xuống một nửa sau 2-3 tuần tập luyện liên tục.
VỀ GIỚI TÍNH:
Con gái thường sẽ tăng được tạ cùng tốc độ với con trai ở các bài compound cho thân dưới như Squat, Deadlift. Chỉ có một lưu ý đó là bạn sẽ phải để ý về trọng lượng cơ thể chút.
Con gái thường sẽ khó tăng tạ với các bài thân trên như Press, Overhead Press, các bài bổ trợ, như con trai.
VỀ KINH NGHIỆM TẬP LUYỆN:
Càng về sau khả năng tăng tạ càng khó. Khi đó một là bạn sẽ phải tăng tạ linearly progression, tức là tiến dần đều, nhưng với mức tạ nhỏ, hoặc sẽ phải áp dụng các phương pháp sắp xếp chương trình tập theo một trật tự có tính toán, gọi là periodization.
Linearly Progression, tặng tạ lên dần đều, với mức tạ nhỏ, có thể lúc đầu bạn sẽ cảm thấy nó ì ạch. Song, càng về sau, khi việc thấy tiến độ tăng tạ là cần thiết hơn bao giờ hết, thì việc nhìn thấy những con số dù là nhỏ nhất thay đổi, cũng sẽ mang lại hiệu quả tích cực cho việc tập luyện.