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科学家开发光激活的“智能塑料” 可用于柔性电子产品和机器人_我的网站

越狱第四季

一 | CHICAGO -- A 71-year-old Illinois man accused of fatally stabbing a 6-year-old boy and seriously wounding a 32-year-old woman was charged with a hate crime Sunday. Police allege he singled out the victims because of their Islamic faith and as a response to the war between Israel and Hamas.Officers found the woman and boy late Saturday morning at a home in an unincorporated area of Plainfield Township, southwest of Chicago, the Will County Sheriff's Office said in a statement on social media. The boy was pronounced dead at a hospital. The woman had multiple stab wounds and was expected to survive, according to the statement. An autopsy on the child showed he had been stabbed dozens of times. “Detectives were able to determine that both victims in this brutal attack were targeted by the suspect due to them being Muslim and the on-going Middle Eastern conflict involving Hamas and the Israelis,” the sheriff's statement said. In recent days, police in U.S. cities and federal authorities have been on high alert for violence driven by antisemitic or Islamophobic sentiments. Jewish and Muslim groups have reported an increase of hateful and threatening rhetoric on social media.According to the Will County sheriff’s office, the woman had called 911 to report that her landlord had attacked her with a knife, adding she then ran into a bathroom and continued to fight him off. The man suspected in the attack was found Saturday outside the home and “sitting upright outside on the ground near the driveway of the residence” with a cut on his forehead, authorities said.Joseph M. Czuba of Plainfield was charged with first-degree murder, attempted first-degree murder, two counts of hate crimes and aggravated battery with a deadly weapon, according to the sheriff's office. He was in custody Sunday and awaiting a court appearance. Attempts to reach Czuba or a family member were unsuccessful Sunday. His home phone number was unlisted. Messages left for possible relatives in online records and on social media were not immediately returned. The sheriff’s office and county public defender's office did not immediately return messages about Czuba's legal representation. Authorities did not release the names of the two victims. But a man identifying himself as the boy's paternal uncle, Yousef Hannon, spoke at a news conference Sunday hosted by the Chicago chapter Council on American-Islamic Relations. There the boy was identified as Wadea Al-Fayoume, a Palestinian-American boy who had recently turned 6. The organization identified the other victim as the boy's mother. “We are not animals, we are humans. We want people to see us as humans, to feel us as humans, to deal with us as humans, because this is what we are,” said Hannon, a Palestinian-American who emigrated to the U.S. in 1999 to work, including as a public school teacher. The Muslim civil liberties organization called the crime “our worst nightmare,” and part of a disturbing spike in hate calls and emails since the outbreak of the Israel-Hamas war. The group cited text messages exchanged among family members that showed the attacker had made disparaging remarks about Muslims. “Palestinians basically, again, with their hearts broken over what’s happening to their people,” said Ahmed Rehab, the group's executive director, “have to also worry about the immediate safety of life and limb living here in this most free of democracies in the world.”___Associated Press reporter Jesse Bedayn in Denver contributed to this report.。据New Atlas报道，塑料可以是硬的，也可以是软的，但塑料可以同时具有这两种特性吗？得克萨斯大学奥斯汀分校的科学家们一直在探索这个问题，并生产出一种首创的材料，这种材料在某些部分是柔韧的，而在其他部分是坚硬的，他们认为有一天这种材料会被用于柔性电子产品和机器人。在开发这种新型材料时，科学家们从天然材料中获得了灵感，这些材料在某些地方是刚性的，而在其他地方则是柔软和有弹性的。皮肤、肌肉、树木和贝类是该团队提供的几个例子，但是创造出混合强度和灵活性的合成版本是很困难的。以前的方法包括将不同的材料混合在一起，但这有其缺点，成品往往在接缝处散开。研究人员声称，在材料科学的这一分支中，一种新型的类似塑料的材料取得了突破。作为一个起点，化学家们使用了单体，即聚集在一起形成聚合物的小分子。在这种情况下，聚合物与常用塑料中的聚合物非常相似，但有一两个特殊的技巧。在测试了十几种候选材料后，科学家们发现了一种催化剂，它可以被整合到单体中，使它们对可见光产生反应，用廉价的蓝色LED来传递。这产生了创造一种半结晶聚合物的效果，其属性类似于橡胶，形成一种坚硬的材料。

二 | 同时，没有暴露在光线下的区域仍然是柔软和有弹性的。

三 | “这是同类材料中的第一种，”化学助理教授和论文的通讯作者Zachariah Page说。“通过应用光来控制结晶，并因此控制材料的物理特性的能力，对于可穿戴电子设备或软体机器人的执行器来说，可能是一种变革。”研究人员称，这种类似塑料的材料的韧性是天然橡胶的10倍，但在不同区域具有不同的物理特性。科学家们想象他们的创造有广泛的应用，包括固定可穿戴技术或医疗设备中的电子元件，以及改善机器人的强度和灵活性。研究第一作者Adrian Rylski说：“我们期待着探索应用这种化学方法来制造包含软硬成分的3D物体。”这项研究发表在《科学》杂志上。

四 |

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