利用Box2D+WCK賦予Flash物理特性 萬有引力
這已經是第五篇Box2D+WCK的介紹文章了,前面幾篇文章如果各位有注意應該會發現,所有範例的萬有引力都跟現在我們生活的環境一樣,物件像是被地心引力給吸引著都會往下方掉落,其實我們在使用這個模組的時候,也可以改變這樣的萬有引力,讓這些物件不要往下掉落而是往我們所指定的方向移動,馬老師在這邊大概製作了三種不同類型的萬有引力範例,分述如下:
1.容器型萬有引力:這個萬有引力是利用一個封閉的空間來繪製的。
大概的製作步驟如下:
我們可以在World元件中繪製一個如下圖的形狀:
接下來將他轉換成一個影片片段,在類別的部分輸入gravity.GravityCapsule的名稱,如下圖所示:
接下來把這個元件拖曳到World元件裡面就可以了。
2.放射狀萬有引力:這種萬有引力是以往內或往外放射狀的方式存在。
我們可以在World元件中繪製一個如下圖的形狀:
接下來將他轉換成一個影片片段,在類別的部分輸入gravity.GravityRadial的名稱,如下圖所示:
接下來把這個元件拖曳到World元件裡面就可以了。
3.正弦萬有引力:就是三角函數的sin。
我們可以在World元件中繪製一個如下圖的形狀:
接下來將他轉換成一個影片片段,在類別的部分輸入gravity.GravitySine的名稱,如下圖所示:
接下來把這個元件拖曳到World元件裡面就可以了。
同樣的也讓大家可以下載以上的三個範例檔,範例檔為CS5格式,下載後要重新設定來源路徑和元件庫路徑喔!希望這個範例對大家有所幫助,如果還有疑問,也可以在這邊回應唷~
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Exposure to phthalates during pregnancy can affect a newborn’s brain development, study finds
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Phthalates — the synthetic chemicals used in everyday products for food packaging, personal care, toys and more — have been linked to abnormal neurological development in infants.
Now, scientists may have discovered a biological pathway for how this phenomenon could occur. Researchers found that in utero exposure to phthalates is linked with altered metabolism of neurotransmitters and amino acids involved in brain maturation, according to a study published Wednesday in the journal Nature Communications.
The report is the first to use untargeted metabolomics — the study of all small molecules or metabolites in a biological system — to connect a mother’s phthalate exposure to a newborn’s metabolites, and those metabolites to neurological development, said senior study author Dr. Donghai Liang via email.
“This represents an important step forward in understanding how prenatal chemical exposures shape infant development at the molecular level,” added Liang, an associate professor of environmental health at Emory University’s Rollins School of Public Health in Atlanta.
First introduced in the 1920s, phthalates are used to make plastics softer and more flexible, primarily in polyvinyl chloride (PVC) products such as vinyl flooring, medical devices, children’s toys, food packaging or shower curtains. The chemicals also help lubricate substances and carry fragrances in various personal care products including deodorant; nail polish; perfumes; hair gels, sprays or shampoos; soaps; and body lotions.
Phthalates are also endocrine disruptors that have been linked to preterm birth, infant genital abnormalities, childhood obesity, asthma, cancer, cardiovascular issues, and low sperm count and testosterone in men.
“We conducted this study because phthalates are everywhere in our daily lives,” Liang said, hence their nickname “everywhere chemicals.”
Harming infant health
The findings are based on mother-newborn pairs enrolled in the Atlanta African American Maternal-Child Cohort between 2016 and 2018. In urine samples collected from 216 mothers between eight weeks and 14 weeks of gestation at visit one and 145 participants between 24 and 30 weeks’ gestation at visit two, the authors measured eight phthalate metabolites. Participants were around age 24 on average, and their levels of some phthalate metabolites were higher than the average determined by the National Health and Nutrition Examination Survey.
Within a day or two of birth, the authors collected the babies’ blood via a heel stick.
The team found prenatal phthalate levels were associated with lower levels of tyrosine, an amino acid and precursor to the thyroid hormone thyroxine. Thyroxine was also abnormally low in those with in utero phthalate exposure, and low thyroxine has been previously associated with greater vulnerability to illness and neurodevelopmental issues in newborns, the authors said. Tyrosine is also a precursor to the neurotransmitters dopamine, norepinephrine and epinephrine, all of which partly contribute to the body’s fight-or-flight response. Low levels of these neurotransmitters can lead to various problems, including anxiety, depression and trouble focusing.
Prenatal phthalate exposure was also linked with lower levels of the essential amino acid tryptophan, which converts into 5-hydroxytryptophan (or 5-HTP), which then turns into serotonin. Both 5-HTP and serotonin were also low. Serotonin has several critical roles in the body, including mood regulation, sleep, learning, memory, digestion and the body’s response to stress. Previous research has linked low serotonin with mood disorders such as depression and anxiety, sleep problems, and digestive issues.
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