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The Parasite-Infested Giant African Land Snail is Back in Florida_我的网站

一 |     More than 1,000 of the slow-moving creatures have been wrangled in New Port Richey since June 23, when the first one was discovered. The snails not only eat hundreds of types of plants, they also crawl up the sides of buildings and consume the calcium from the stucco and plaster found there before leaving behind their droppings.,"These snails could be devastating to Florida agriculture and natural areas as they cause extensive damage to tropical and subtropical environments," the Florida Department of Agriculture & Consumer Services (FDACS) warned.,Beyond the damage to plants and buildings, the snails carry with them a dangerous threat to humans, too. Rat lungworm (Angiostrongylus cantonensis) most often infect the lungs of rats and other rodents, but can be transmitted through their digestive system. The lungworm larvae is then found in rat feces, which then infect the snails.,Humans can come into contact with the lungworms either by eating undercooked snails, fruits and vegetables contaminated by the infected snails, or consuming undercooked frogs and crabs that have snacked on a sick snail. While the parasite sometimes dies in a human’s central nervous system, other times it can travel through the brain and cause meningitis: a swelling around the brain and spinal cord which can lead to paralysis, comas, and death.,Thankfully, thus far scientists have yet to detect rat lungworm in the snails that have been wrangled in Pasco County, says Greg Hodges, who is an assistant director of the Florida Department of Agriculture’s Division of Plant Industry.,“Let me assure you, we will eradicate these snails. We have done it twice before, and we will do it again – it is not a question of if, but when. Together, let’s locate, communicate, and eradicate, so Florida can again be GALS free,” said Florida Commissioner Nikki Fried.,The state of Florida has set up a quarantine that runs from the northwest corner of the U.S. 19-Ridge Road intersection, and east to Little Road and south to Trouble Creek Road in New Port Richey, Pasco County. In this quarantine area, residents are restricted from touching or moving found snails, as well as plants, soil, compost, and yard waste. Those who do find any other snails are asked to contact state authorities.,At least 30 state employees are searching for the snails and are being assisted by dogs trained to sniff out the invasive critters. Authorities are also using metaldehyde to kill the snails, a pesticide that affects their mucus production and causes lethal dehydration.,The last time Florida dealt with a snail invasion, those giant African snails were dark gray and brown, but now? Authorities are finding the snails to have whiter, cream-colored bodies and dark shells. These newer snails are heavily sought after in the pet trade industry, but in Florida it is illegal to import or own a giant African snail without a permit. However, Florida state authorities have discovered individuals doing just that.。    团队后续将基于硅光子、光子AI技术，把这套方案拓展至大规模可编程光子集成芯片。         首尔国立大学工学院发布消息：由首尔国立大学电气与计算机工程系Namkyoo Park教授、Sunkyu Yu教授牵头的联合研究团队，联合首尔大学电气与计算机工程系Xianji Piao教授，研发出一款可按需慢光的光子集成芯片。         生成式人工智能与大尺度AI模型飞速发展，算力需求暴涨，传统电子半导体的短板随之凸显，包括功耗高、数据传输速率受限等问题。

二 | 市场对具备低功耗、超高速处理能力的光计算技术需求持续攀升。

三 | 但由于光的传播速度固定，实现光计算不可或缺的光缓存与存储功能，长期存在根本性技术难题。         为解决该难题，这支联合研究团队设计出一种可编程光子集成芯片方案，能够自由调控光信号的传播速度与波形。依托该方案，团队实现了比现有所有方案自由度更高的“慢光”调控。

四 | 相关研究成果刊发在《Advanced Science》期刊。

五 |          可编程耦合谐振腔诱导透明（CRIT）光子集成电路结构示意图：图中展示通过调节光学谐振腔之间的耦合强度，即可灵活调控光路传输路径。         光速固定为何会成为技术瓶颈          光子集成芯片作为新一代技术，依托光信号实现高速、高效信息处理。尤其在数据中心、光通信与光计算系统中，行业不仅需要快速传输光信号，还要求能够同步信号到达时序、按需对光信号做延时处理。业内针对耦合谐振腔诱导透明（CRIT）结构开展大量研究：该结构利用多组光学谐振腔之间的干涉效应，仅让特定频段的光透过，同时降低光信号传播速度。

六 |          耦合谐振腔诱导透明（CRIT）是一种光学现象，通过多谐振腔干涉，选择性透过特定频段光并实现光延时。光学谐振腔是一类光子器件，可将特定频率的光束缚、循环传输一段时间，多用于信号延时、滤波与调制。         但传统耦合谐振腔诱导透明（CRIT）器件加工完成后工作特性固定，难以重新配置以适配不同功能。

七 | 例如，若需要更长延时或切换工作频段，必须重新设计整套光子器件。

八 |          光信号延时与频谱转换示意图，图示电路可根据控制条件，对光脉冲实现延时、修改频谱组分。

九 |          重构CRIT结构，提升可重构灵活性          传统器件灵活性不足，大幅提升光通信设备、数据中心系统的设计复杂度；新增功能时，设备成本上升、研发周期拉长。在AI服务器、下一代数据中心这类需要实时处理海量数据的场景下，该短板已成为光计算技术落地的核心阻碍。         为突破上述局限，研究团队提出全新设计思路：将耦合谐振腔诱导透明系统内的两种光学状态——亮模（bright mode）与暗模（dark mode）统一为单一可控自由度，并引入两组可控环形耦合器。基于该思路，团队建立可编程光子集成芯片全新设计准则，以往加工后参数固化的谐振腔结构，如今可按需重新配置。         团队依托全新CRIT结构实现光路按需延时调控，并证明亮模、暗模之间的干涉效应可作为统一集成设计参数。这大幅提升了光子谐振电路的设计自由度，打破传统器件参数固定的约束。         研究团队特别证实：借助双环形耦合器，可从理论层面独立调控通带带宽、波形，以及电路中传输信号的延时、透射特性。

十 | 这意味着，无论单个谐振腔，还是整套多谐振腔系统，光信号的传播速率与传输特性均可自由重构。         除此之外，团队通过数值仿真验证：芯片运行过程中，可实时动态调整光脉冲传播速度。实验证实，该结构能在不损失信号处理性能的前提下自由控制光信号延时，无需额外专用器件即可完成光频谱转换。

十一 |          光脉冲是一段短促光信号，是光通信、光计算系统中承载信息的基础单元。         团队还通过三维电磁仿真验证：该CRIT器件可在氮化硅（Si₃N₄）光子集成芯片平台上实现制备。同时团队分析了制造、运行阶段各类实际干扰因素，包括材料损耗、谐振腔品质因子偏差、背向散射、耦合系数波动、环形耦合器相位误差、热串扰等，证实该结构可在真实光子电路环境下稳定工作。

十二 |          氮化硅（Si₃N₄）光子集成芯片是低损耗、高稳定性波导平台，广泛用于光信号处理与集成光子器件。热串扰是电路局部工作产生的热量干扰周边元器件，造成器件性能偏移的现象。         单芯片集成多项光学功能          本研究推出一款全新可编程光子集成芯片平台，可实时调控光信号的时域、频域特性，克服传统固定延时光路的局限。该方案可将下一代光互连所需核心功能——信号时序同步、可变延时线、光缓存、频谱转换等，全部集成在单套光子芯片架构内。         同时，这套设计思路不局限于CRIT体系，可拓展至全部基于谐振腔的光子电路，有望成为下一代灵活调控光传输的光信号处理底层核心技术。         若实现商业化落地，本研究开发的可编程光子集成芯片可像软件定义系统一样，单颗光芯片完成信号速率调控、功能切换等多项任务。既能大幅降低数据中心、AI服务器的功耗，也能提升数据处理效率。         此外，多类信号处理功能单片集成，可推动光通信设备、传感系统小型化，降低硬件成本。长期来看，该技术将成为自动驾驶、新一代通信、量子技术等超高速信息处理产业的核心支撑平台。         从理论走向工程落地          论文共同通讯作者、首尔国立大学Namkyoo Park教授表示：“本次研究提出一套全新设计准则，让光子集成芯片内部光路能够按需重构，极大拓宽设计灵活度。团队后续将基于硅光子、光子AI技术，把这套方案拓展至大规模可编程光子集成芯片。”          负责理论框架搭建与数值仿真的共同一作Seungkyun Park博士、博士生Beomjoon Chae补充道：“本次研究让我们意识到，换一种视角解读传统光子谐振物理机制，可为光子集成芯片挖掘全新功能。后续我们将持续推进研究，完成实物器件制备与实验验证。”          *声明：本文系原作者创作。文章内容系其个人观点，我方转载仅为分享与讨论，不代表我方赞成或认同，如有异议，请联系后台。

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