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  上海4月17日电(记者陈静)在一眨眼的时间内,超级闪存已经工作了10亿次,而原来的U盘只能1000次。相当于光在走了12厘米的时间内,几千个电子已经储存完毕。

  记者17日获悉,复旦大学周鹏/刘春森团队成功研制“破晓(PoX)”皮秒闪存器件,擦写速度达到亚1纳秒(400皮秒),是人类目前掌握的最快半导体电荷存储器件。

  北京时间4月16日深夜,相关研究成果发表于国际顶尖期刊《自然》(Nature)。

  从远古时代的结绳记事开始,人类对信息存储速度的追求从未止步。随着科技不断演进,电荷被证明是最佳存储媒介,能够以惊人的速度和卓越的可靠性承载海量数据。随着人工智能(AI)时代的到来,计算范式正从传统的逻辑运算逐渐转向数据驱动的计算模式。信息存取速度直接决定了算力上限,亟需存储技术的突破来实现变革。

  据介绍,目前速度最快的存储器均为易失性存储器,断电后数据丢失的特性限制了其在低功耗场景下的应用,难以满足AI计算对数据极高速存取的需求。

  复旦大学周鹏/刘春森团队构建了准二维高斯模型,成功从理论上预测了超注入现象,并据此研制“破晓(PoX)”皮秒闪存器件,其性能超越同技术节点下世界最快的易失性存储SRAM技术;通过AI算法对工艺测试条件实现科学优化,极大推动技术创新与落地。

  据悉,中国专家团队研发的突破性高速非易失闪存技术,不仅有望改变全球存储技术格局,进而推动产业升级并催生全新应用场景,还为中国在相关领域实现技术引领提供强有力支撑。(完)

  正确认识和干预胃癌前病变,尽早发现胃癌,对保障健康具有重要意义。

胃的“危险信号灯”

  胃癌前病变主要包括慢性萎缩性胃炎、胃息肉、胃溃疡等,其病理变化主要包括胃黏膜上皮异型增生和肠上皮化生。

  慢性萎缩性胃炎的特征性改变包括胃黏膜腺体数量减少、腺体结构异常,以及胃黏膜变薄。

  胃息肉是指胃黏膜表面长出的突起状乳头状组织,是胃良性肿瘤的一种,比如胃底腺息肉等。

  胃溃疡是由饮酒、幽门螺杆菌感染、止痛药和激素过度使用等多种原因导致的胃黏膜破损。

  肠上皮化生是指胃黏膜中出现类似小肠或大肠黏膜的上皮细胞,通常属于萎缩性胃炎的继发性变化。

  上皮内瘤变也被称为异型增生或不典型增生,是细胞开始“变坏”的阶段,临床上一般分为低级别上皮内瘤变和高级别上皮内瘤变。低级别上皮内瘤变相当于轻中度异型增生,有可能发展为癌。高级别上皮内瘤变相当于重度异型增生或原位癌,需要尽早治疗。

  有上述疾病的患者可能出现胃部疼痛、食欲下降等症状,有时与胃癌的症状无法准确区分,因此要尽早就医。

你的胃正在被这样伤害

  01

  幽门螺杆菌:一种在人胃黏膜中普遍存在的细菌,是藏在胃里的“钉子户”,可通过唾液传播,并与慢性胃炎、胃溃疡和胃癌等多种疾病密切相关。

  02

  饮食刺客:腌菜等食物中亚硝酸盐含量较高,被人体吸收后可能转化为亚硝胺导致癌变。烧烤、油炸食物品是危险因素之一,其主要致癌物是多环芳烃类化合物。此外,饮食不规律、吸烟、饮酒、熬夜等“伤胃组合拳”也是胃癌的高危因素。

  03

  遗传警报:有胃癌家族史者要特别警惕。一级亲属(父母、兄弟姐妹)罹患胃癌的人群应加强胃癌筛查。

抓住诊疗的“黄金时机”

  发现胃癌前病变是阻断胃癌发展的关键窗口期,可显著降低胃癌风险。

  根据《中国早期胃癌筛查流程专家共识(2023)》,对于上述提到的高危人群,建议尽早进行胃镜筛查。胃镜+活检是诊断胃癌及胃癌前病变的金标准。若发现高级别上皮内瘤变则需要尽快咨询专科医生,制订相关治疗方案,比如内镜黏膜下剥离术。

  此外,筛查方式还包括血液学检查、幽门螺杆菌检测等。若发现幽门螺杆菌感染应在医师指导下制订药物治疗方案。

  作者:四川大学华西医院胃癌中心陈小龙

  审核:国家健康科普专家库成员、四川大学华西医院胃癌中心主任医师胡建昆

  策划:谭嘉王宁

  编辑:刘洋 新闻结尾 黯乡魂全文阅读-探索无尽幻想世界,尽享激情与创意的完美结合!的相关文章
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