席贈黃鶯曲，醉聆天籟音。
－別兩茫茫，青冥何太深。
君以文章著，行以誠義稱。
社群轉暴戾，佛儒不容身。
亂世猶持道，不逆菩提心。
慧修無相檀，崇善更求真。
寂照度彼岸，祈福寄天城。


懷念一位難得的友人。回憶在2012年春夏聚餐時，惠贈宋祖英歌唱家在台北2011年演唱會的錄影。他平時待人誠厚，這只是一件事例。 八月二十日是他的冥誕，前年此日 曾以五言短歌行寫下心中的思念。以上是今天的版本。倉促寄上，目的只是拋磚引玉，希望友人們不要介意。

Spencer and ManLi

源寧兄生日快樂

我和慧玲今年三月去台灣旅遊，和親友歡聚，多年不見大家都身體健康。我們在台吃喝玩樂，非常開心。

餘定

源寧兄千古


我們將去台灣旅遊，探親訪友，希望改善生活環境。祝你安息吧！

餘定

源寧兄生日快樂

餘定恭賀

源寧兄

我們今天去墓園拜拜獻花祈福，祝你安息。

餘定

源宁兄千古

祝愿生日快乐，安息天庭。

馀定

源宁兄
昨天是你的忌日，我和慧玲一起去你墓地看望。美国现在乱象丛生，天災人祸，加州也是不安宁。願你在天之灵安息吧。
馀定

Happy birthday to my friend YN. I just drove Jean to your cemetery for your celebration. May you Rest In Peace.

Richard

源寕兄

最近全世界都在加紧防疫措施，中国和美国疫情非常严重，我们大家都小心翼翼在家保护安全以免被传染。人生在世总有天災人祸，但愿健康平安。願你在天之灵安息吧。

馀定

Dear YN

Happy birthday! We are going to visit you this afternoon after Steve and Alexie get off work. We paid you a visit last month when Christine came with Meagan. The little girl is going to college in two years. Brandon went to China for the summer school and he enjoyed very much. Younger generation is growing up. It’s nice for them to remember you. May you Rest In Peace.

Your friend Richard

源寧兄千古
我到南加州已經一年多了，很喜歡這裡的天氣，四季如春，非常適合老人退休生活。你在此地安息，不要擔心風雪肆虐，真的是福地。昨天陪慧玲和Steve Alexie Kylie Sammy到你的墓地獻花果，紀念你的誕辰。風和日麗陽光普照，一片祥和景象。願你安息吧！
餘定

Happy birthday my dear friend Yuan-Ning
We are in Santa Rosa visiting Jimmy, Mary, Oli and Charlie. We enjoy their company very much. Everyone is doing fine.
Richard

源寧兄千古 歲月匆匆，你離去已經三年。今天是你的忌日紀念祝你安息。慧玲手術成功康復正常一切勿念。弟餘定

源寧
時光荏苒你離開我們巳經二年多了！時常想念你的笑容和親切的談心。慧玲慧中秀外精明能幹，是女中豪傑。我會在你的庇護下好好照顧她的。願你在天邊靈安息吧！
餘定

源寧
願你在天國安息吧！我們會永遠記得你的友情和笑容。
餘定敬悼

源寧
時光荏苒不知不覺又過了一年，想起在華府共近午餐並且歡談家常，猶如歷歷在目。如今天人遠隔，往事只堪囘味而已。留下來的只有照片幾張，睹影思念故友，徒增傷感。安息吧老友，日後在天國相會。
餘定

The best thing in life is to have Yuan-Ning and Jean as our friends. The saddest thing is life is to learn that Yuan-Ning left us suddenly in our life's journey.

We treasure our many moments together – care-free before the children came, the explorer spirit in the first house hunting, the excitement of moving into a new house, the life's pleasure of watching children grown from babies, to toddler, to children, to adults.

We are here to celebrate Yuan-Ning's life and affirm the difference he made to our lives. His modesty, sense of humor, dedication to family and friends are inspiring, always.

Rest in Peace, Yuan-Ning. We will always miss you.

From Allan and Lisa Wang

My sincere condolences to all the Liu family members for their loss of a great son, father, husband, grandfather, and friend. The wonderful memories of
your family gatherings, travels, and celebrations will serve to help you through your sorrow and the loss of this great man. My thoughts and prayers are extended to all of you.

We are so sorry for your loss. Please let us know if we can do anything to help you out during this difficult time. 
Nova Hall and Alexis Rahal

I have the privilege of working for him from 1990 until he retired, he is my mentor and a great teacher, he always has a special place in my heart. He always there for me throughout my career, I can always count on his guidance and his sense of humor to get me thru some tough times. I miss his infectious laugh, his common sense but intellectual approach to problem, I will miss him dearly.

Words cannot express how saddened we are to hear of your loss. I can’t imagine the sadness you must be feeling from your loss. My love thoughts and prayers are with you and your entire family.

Fehmida

I met with Dr. Liu on only a few occasions, but they were magic experiences, and I’m writing to record my sadness at his disappearance and to express my condolences to his family.

Both Dr. Liu and I were civilian scientists employed by the Navy. We worked on different aspects of undersea acoustics; I on the damage done to signals as they propagated through the ocean, and he on the acoustic disturbances caused by a submarine as it moves through the water, a field called ‘turbulent flow noise’. This is what's heard when a window is opened in a moving auto, and it's the origin of the signals hear on stethoscopes. It is a field so complicated that it is not well understood even today: Richard Feynman cited turbulence as ‘the last great unsolved problem in classical Physics’. As is the case with most Physics problems, turbulence phenomena are relatively easy to describe (i.e., answering the ‘what’ question) but difficult to understand (i.e., finding out ‘why’ or ‘how’), Understanding in at least some degree is necessary if one hopes to find a cure, and it was from Dr. Liu that I got that understanding: exquisitely lucid and complete explanations that I had been unable to find anywhere else.

The Navy needs many Liu clones but since I only met one I have to infer that the need is going to go wanting.

源寧兄的悪訉,讓我们極為悲痛，悲伤於一位仁者的離去，也痛心於一位好友的永别，更難於接受的是我们还在期盼與他及慧玲在DC的重聚。

我们認識源寧二十多年，跟他是'君子之交'，差不多一，二個月才會在G-Club 聚餐見面。在人群中，他不多說話，即使是熟悉的話題，也不急於發表意見。但常常，寥寥數語却表達了他高度的智慧，與深入的見解。他對人很熱誠，問他問題，他縂是很有耐心的解釋，既使是在很忙的時候。我們曾問他退休健保的選擇，他不厭其煩的解釋，讓我們受益非淺。 他對朋友也很細心,週到，記得一次在聊天
中，聽到我們也喜歡聽宋祖英的歌，等下次見面時，他出其不意，帶來了宋祖英演唱會的DVD，譲我們深深感動, 他後來又送了幾張，類似的事他做了很多。他一直給別人溫暖，永遠對朋友付出，真是一位難得的友人。現在囬憶起這些點點
滴滴，我們仍感到陣陣暖意。

今年他不能與我们同享華府的春天，但他留給我們许多美好的回憶，每一片囬憶, 都会讓我们感到陣陣暖意，譲我们永远在春風裏。

吳澄，曼麗敬上

My condolences go to Mrs. Jean Liu and her family. May God be with you during this time of loss and healing. May you have peace and love as you cherished the many happy memories with Dr. Liu. With sincere and respect. 
Lien Dinh

Our family is related to Dr. Liu through the marriage of our youngest brother, Felix, to his daughter, Christine. The first time I met Dr. Liu, I was impressed by his unassuming, approachable and erudite characteristics. Our rapport was immediately established. From our constant association with him, I could discern that he was such a wonderful husband and father, besides being a wonderful elder and friend. He was a father that I do not mind having. In fact, if he were to adopt me, I would not hesitate to respond with a big "yes". I vividly recalled that when our father passed away, he and his wife came all the way from Virginia to lend us support and comfort. My sorrow was very much alleviated by their tender loving and soothing actions and words. Dr. Liu, you have lived a full life with much accomplishments. We will miss you very much. May you rest in peace.

Dr. Y-N Liu is a man of great intelligence, intellect, grace and dignity; with a caring heart and positive personality that endeared him to everyone he met. Dr. Liu is alive and well, not living in a physical body, but living in the hearts and souls of all of us who knew him, worked with him and shared his deep and abiding joy of life, family and pursuit of scientific understanding. Let us not mourn the passing of the body but let us carry on his legacy of kindness, caring, scientific integrity, and helpfullness and pursue the love of life that is Dr. Liu. Bless you Dr. Liu for you have made each of us a better person for having known you. There is no greater tribute.

Yuan-Ning was my high school classmate in Taipei. We are very close for more than half century. He used to visit us in New York before he was married. We visited them in Virginia many times. We met for lunch a year ago and talked for hours. He was always sincere, happy, sunny, healthy, considerate and positive. We served together at ROTC in Taiwan after graduating from college. I cherish our longstanding friendship so much. He will be missed by so many friends and family.

Yuan-Ning was always a close great friend of ours for more than 40 years, a colleague also with Tsze Cheng for 37 years at the U.S. Navy's Lab. It's a blessing to have known him and his family. He was a man of modesty, integrity and intelligence. We were having such a good time visiting and chattering with him at his home in San Diego on Valentine's Day last month. He was positive all the time in good spirit with a smiling face. He made a wonderful decision to move to San Diego, the heavenly warm spot resting in The Lord peacefully with his closest family members around. Although he was deeply missed by us, yet he is in the heaven, a better place, we trust. May God's love, mercy and comfort be with the Liu's family
Love and blessings,
Tsze Cheng and Thelma
In Potomac, Maryland, March 27,2014