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A | 8月26日消息，中科宇航官方今日发文，8月25日力箭二号遥二运载火箭完成出厂前各项工作，产品功能和性能指标均满足飞行任务要求，顺利通过出厂评审，即将奔赴发射场，拟于今年10月执行发射。 Influenza and other respiratory viruses are starting to circulate but so far remain lower than this time last year, according to the Centers for Disease Control and Prevention.As of Oct. 7, CDC's FluView weekly report showed that the percent of flu cases were relatively unchanged, rising about 1% compared to the week prior.In that same timeframe, 1,127 people were hospitalized with influenza, up from 1,050 people the week prior. About 35% of all flu hospitalizations were reported in the southeast of the U.S., which experts say is a typical trend at the start of the flu season.Most of the flu cases detected were Influenza A and the most common subtype was Influenza A(H1N1), which is the strain of the virus that the flu vaccine usually offers better protection from, according to the CDC.The percent of all reported respiratory viruses circulating over the past week have been relatively unchanged nationally, but there is regional variability. Region 9 -- made up of Arizona, California, Hawaii, and Nevada -- was the only region that saw an increase.Still, the numbers in all regions of the U.S. remain below their baseline and outpatient respiratory illness activity is either minimal or low throughout most of the U.S., according to the CDC.Alaska is the only state that is currently experiencing moderate respiratory illness activity. Influenza typically circulates this time of year and peaks between December and February for most of the U.S., according to the CDC.Respiratory syncytial virus (RSV) numbers are on the rise and are projected to increase further, according to the CDC's weekly surveillance. RSV typically circulates from October to April, according to the CDC.How to prepare for this year's cold and flu season
This time last year, the U.S. was bracing for a "tripledemic" amid rising cases of COVID-19, influenza and RSV after the seasons became more unpredictable during the COVID-19 pandemic.Dr. John Brownstein, chief innovation officer at Boston Children's Hospital and an ABC News contributor, said these early cases are behaving in a more predictable pattern."The data is pointing to something a little bit more par for the course. We're seeing the early rise of RSV and flu at a time when you'd expect it," Brownstein said.Brownstein, however, cautioned that cases of respiratory viruses are expected to increase further and higher levels still have potential to strain health systems and cause severe illnesses, Brownstein said."I think there's still concern around the threat of all three respiratory viruses plus, of course, the rest of the seasonal mix [of viral illnesses], wreaking havoc on our health systems," he said.Experts are hopeful that new and updated immunizations that protect against COVID-19, influenza and RSV will stave off the strain on health care systems.These viruses may only cause mild illness for many people, but young babies, pregnant women, people who are immunocompromised and the elderly are at highest risk for severe disease.Everyone 6 months and older is eligible for an updated COVID-19 shot and the annual flu vaccine.The Department of Health and Human Services told ABC News that, so far, more than 7 million updated COVID-19 shots have been administered. The CDC recommends getting the COVID-19 and flu vaccines by the end of October and encourages both to be given at the same time.Adults who are 60 years and older can get an RSV vaccine and pregnant women who are in their third trimester can get an RSV shot that provides protection against RSV to their baby for the first 6 months of life.Babies less than 8 months old who are born to mothers who did not get an RSV vaccine during pregnancy can get a protective shot called nirsevimab that offers about five months of protection against RSV.Nirsevimab is a one-dose shot made of monoclonal antibodies, which are proteins manufactured in a lab and mimic the antibodies the body naturally creates when fighting an infection. This is different than a vaccine, which activates the immune system.Brownstein said the pandemic has helped make many health systems better prepared for seasonal spikes in respiratory viruses and is hopeful that people are more motivated to stay up to date on shots that are available for protection and prevention this respiratory virus season."Now is really the time to get the protection advanced of the seasons really heating up," Brownstein said.Dr. Jade A Cobern, M.D., M.P.H, a licensed and practicing physician, is a member of the ABC News Medical Unit.。
B | 据悉，本次任务将首次执行低轨星座规模化组网发射，以一箭18星的方式投送载荷，此前力箭二号已中标上海垣信千帆星座的一箭18星发射服务采购项目。 力箭二号是我国首款通用助推器核心（CBC）构型的运载火箭，总长53米，起飞重量625吨，500公里太阳同步轨道运载能力8吨，200公里近地轨道运载能力12吨，通过增减助推器可覆盖2至20吨运力区间。 今年3月30日遥一火箭首飞成功，将轻舟初样试飞船和卫星精准入轨，单次输送4.2吨载荷，首飞即服务国家重大战略。 本次遥二总装测试周期较首飞稳步缩短，正朝标准化、批量化目标迈进，力箭二号总指挥杨浩亮此前透露，借鉴汽车自动化产线逻辑，该型号可实现年产20发的生产能力。 回收布局方面，中科宇航走的是一条差异化路线，力箭二号采用集束式回收方案，芯一级与助推器不分离、一起整体回收，这一构型在全球属首创，气动操纵性更优、着陆冲击更低、动力冗余更强，回收部分占全箭比例更高。 具体节奏上，公司先通过力鸿系列飞行器验证回收技术，力鸿一号已完整验证再入大气层减速回收和箭体精确落点控制，今年还将进行力鸿二号百公里级回收试验，之后把回收技术迁移至力箭二号，争取在第八发实现发动机和火箭的共同回收，火箭设计复用次数超过20次。 并且，成本也是改箭的另一大杀手锏，力箭二号在不回收状态下，单次发射成本约3万元人民币每公斤，与SpaceX猎鹰9号基本持平，实现回收后有望降至1.5万元每公斤左右，约为SpaceX的一半。作为对比，猎鹰9号面向商业客户的公开报价在每公斤5000至7000美元。
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