科學家繪製出小鼠大腦中數英里長的神經連結圖 在繪製小鼠一立方毫米大腦圖時，科學家收集了 1.6PB 的數據——相當於 22 年不間斷的高清影片。One petabyte holds 1000 terabytes (TB) or 1,000,000,000,000,000 bytes.。 超高速磁振造影技術在睡眠期間，大腦會進入一種狀態，在這種狀態下，腦液會更有效地脈動、旋轉和循環，這可能有助於清除廢物。三維（3D）列印，或稱為積層製造，正透過更快、更經濟、更分散地生產軍用硬件，迅速改變國防工業。正如CNN報導技術正從塑膠轉向先進金屬，從而可以製造結構部件和複雜系統，而無需組裝。據國防工業專家稱，這正在重塑製造業，並增強後勤支援能力。

 

2025年4月10日 ·

分享對象：所有人

科學家繪製出小鼠大腦中數英里長的神經連結圖

在繪製小鼠一立方毫米大腦圖時，科學家收集了 1.6PB 的數據——相當於 22 年不間斷的高清影片。

Scientists Map Miles of Wiring in a Speck of Mouse Brain

In charting a cubic millimeter of a mouse’s brain, scientists amassed 1.6 petabytes of data — the equivalent of 22 years of nonstop high-definition video.

A petabyte (PB) is a unit of measurement in computers and similar electronic devices. One petabyte holds 1000 terabytes (TB) or 1,000,000,000,000,000 bytes.

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芬蘭奧盧大學的研究團隊利用新開發的超高速磁振造影技術，即時追蹤了大腦中水分子的運動。他們發現，在睡眠期間，大腦會進入一種狀態，在這種狀態下，腦液會更有效地脈動、旋轉和循環，這可能有助於清除廢物。

VICE 

Using a newly developed ultrafast MRI technique, a research team at the University of Oulu in Finland tracked the movement of water molecules in the brain in real time. They found that during sleep, the brain shifts into a state in which fluids pulse, swirl, and circulate more efficiently, likely helping clear waste.

三維（3D）列印，或稱為積層製造，正透過更快、更經濟、更分散地生產軍用硬件，迅速改變國防工業。正如CNN報導的那樣，像Divergent Technologies這樣的公司正在利用先進的3D列印技術，以遠低於傳統方法的成本和時間，製造飛彈彈體和戰車零件等軍事組件。

3D列印在國防領域的關鍵應用

硬體製造：各公司正在生產先進的金屬和複合材料結構，包括可高速製造的「低成本」飛彈彈體，用於國防應用。

快速部署：美國陸軍已測試了3D列印武器，例如榴彈發射器（R.A.M.B.O.），並正在研究在戰場上製造3D列印無人機，從而實現一夜之間完成生產和維修。

現場支援：3D列印可以現場製造損壞設備的替代品，從而減輕向戰區運輸備件的後勤負擔。

基礎設施重建：在烏克蘭等戰區，一些項目正在利用3D列印技術建造包括學校和避難所在內的各種設施。

主要擔憂和挑戰

難以檢測的槍支：多份報告都提出了一個主要擔憂，即3D列印槍支的能力，例如「解放者」手槍，這種手槍由塑膠製成，有可能繞過金屬探測器，從而導致監管部門的嚴厲打擊。

監管與安全：用於列印武器的數位文件（藍圖）在網路上的傳播，給試圖控制此類武器擴散的各國政府帶來了巨大的監管挑戰。

未來展望

這項技術正從塑膠轉向先進金屬，從而可以製造結構部件和複雜系統，而無需組裝。據國防工業專家稱，這正在重塑製造業，並增強後勤支援能力。

AI Overview 2026Three-dimensional (3D) printing, or additive manufacturing, is rapidly transforming the defense industry by enabling faster, cheaper, and more decentralized production of military hardware.2014  New 3D printer at Weill Cornell Medicine has the potential to revolutionize medicine

AI Overview

Three-dimensional (3D) printing, or additive manufacturing, is rapidly transforming the defense industry by enabling faster, cheaper, and more decentralized production of military hardware. As highlighted by CNN, companies like Divergent Technologies are utilizing advanced 3D printing to create military components, such as missile airframes and combat vehicle parts, at a fraction of the cost and time of traditional methods. 

Key Defense Applications of 3D Printing

• Manufacturing Hardware: Companies are producing advanced metallic and composite structures, including "low-cost" missile airframes that can be manufactured at high speed for defense applications.
• Rapid Deployment: The U.S. Army has tested printing weapons like grenade launchers (R.A.M.B.O.) and is researching 3D-printed drone manufacturing in the field, allowing for overnight production and repair.
• Field Support: 3D printing can create on-site replacements for damaged equipment, reducing the logistical burden of transporting spare parts to war zones.
• Infrastructure Reconstruction: In war zones like Ukraine, projects are using 3D printing to build structures, including schools and shelters. 

Key Concerns and Challenges

• Undetectable Firearms: A major concern raised in various reports is the ability to print firearms, such as "The Liberator" pistol, which is made from plastic and could potentially bypass metal detectors, leading to regulatory crackdowns.
• Regulation and Security: The distribution of digital files (blueprints) for printing weapons online has created significant regulatory challenges for governments attempting to control the spread of these arms. 

Future Outlook
The technology is moving beyond plastic to advanced metals, allowing for structural parts and complex systems to be fabricated rather than assembled. This, according to defense industry experts, is reshaping manufacturing and enhancing logistics resilience. 

New 3D printer at Weill Cornell Medicine has the potential to revolutionize medicine

3-D printings

2015
UC Berkeley


Yesterday, a UC Berkeley research team led by Ronald Rael, associate professor of architecture, unveiled the first and largest powder-based 3-D printed cement s⋯⋯




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Using a 3-D printer, these college kids are making robotic arms for children without real ones. http://cnn.it/1wPjjjh



College kids make robotic arms for children without real ones


CNN.COM|由 DAPHNE SASHIN, CNN 上傳

In the spring of 2014, first-year M.D.- Ph.D. student Du Cheng brought a bone fragment from an anatomical model to Dr. Estomih Mtui. Cheng told Dr. Mtui, a professor of anatomy of radiology, that he'd found the fragment, part of a facsimile of the fourJth lumbar vertebrae that had gone missing from the lab.
That was a fib: Cheng had actually created the piece using a 3D printer, a demo model he'd seen in a store. But he wanted to test the machine's prowess, so he passed it off to Dr. Mtui as the real thing. The professor slipped the bone model in place — and it fit. Only then did Cheng reveal that the crucial bit had been printed for mere pennies. As Cheng recalls it: "I said, 'Oh my God — you didn't realize that producing this only cost 25 cents!'"
In summer 2014 — fueled in part by that success — Cheng convinced Weill Cornell Medicine to purchase a 3D printer for general use, and he has since formed a user's group that now includes more than 100 people. The printer is in the library — Cheng says he enjoys watching tour groups of prospective students stop and admire it — and is available to members of the Weill Cornell Medicine community who complete a training class with the student group DimensionWorks for Biomedical Design, of which Cheng is president.





Print It!


In 3D printing, a user designs an object using a computer program; the printer then creates it by extruding one thin layer of plastic on top of another, building it up into the desired shape. The technology is already having a positive impact on research, says Jonathan Witztum, a doctoral candidate in physiology, biophysics and systems biology. For example, Witztum recently needed a special kind of imaging chamber to study brain tissue for his thesis. "Having the printer on campus shortened the time it took to design and perfect the chambers we use," Witztum says. "Making it available to everyone has a great impact on people's work." The printer has fostered a number of other projects, Cheng says. It has been used to create a specialized platform for a microscope that would otherwise cost thousands of dollars; to make models of bone marrow for pediatric research; to create a fixation device for researchers imaging the brains of mice; and more.
As work at Weill Cornell Medicine and elsewhere has shown, 3D printing technology has the potential to revolutionize medicine, notes Dr. Francis Barany, a professor of microbiology and immunology. In a collaboration between Weill Cornell Medicine and the Ithaca campus, for example, researchers are creating 3D printed ears made from living tissue that could be implanted in patients who lack them due to a congenital defect. "Every human is different, so the ability to print something that can be put into the body is very exciting," Dr. Barany says. "3D printing is a baby right now. Who knows how it's going to grow up?"
— Jeff Stein






Cornell University 更新了封面相片。

New 3D printer at Weill Cornell Medicine has the potential to revolutionize medicine. Learn more:http://weill.cornell.edu/news/news/2015/11/print-it.html