At the beginning of 2017,on behalf of the Editorial Board of Green Energy&Environment(GEE),we wish all of our readers,authors and reviewers a very happy and successful2017.Looking back to 2016,GEE has received man...At the beginning of 2017,on behalf of the Editorial Board of Green Energy&Environment(GEE),we wish all of our readers,authors and reviewers a very happy and successful2017.Looking back to 2016,GEE has received many submissions from many countries all over the world since it was launched in April 2016.In the former three issues published,we remain committed to delivering those articles which should be展开更多
A method of underwater simultaneous localization and mapping （SLAM） based on forward-looking sonar was proposed in this paper. Positions of objects were obtained by the forward-looking sonar, and an improved associa...A method of underwater simultaneous localization and mapping （SLAM） based on forward-looking sonar was proposed in this paper. Positions of objects were obtained by the forward-looking sonar, and an improved association method based on an ant colony algorithm was introduced to estimate the positions. In order to improve the precision of the positions, the extended Kalman filter （EKF） was adopted. The presented algorithm was tested in a tank, and the maximum estimation error of SLAM gained was 0.25 m. The tests verify that this method can maintain better association efficiency and reduce navigatioJ~ error.展开更多
Dear editor,A 76-year-old Chinese female presented by ambulance to the Emergency Department complaining of dizziness,headache and fatigue.Her son claimed that the patient“turned blue”three hours prior to onset of th...Dear editor,A 76-year-old Chinese female presented by ambulance to the Emergency Department complaining of dizziness,headache and fatigue.Her son claimed that the patient“turned blue”three hours prior to onset of the patient’s symptoms.Paramedics noted the patient’s SpO2 was 83%on room air with no improvement with a nonrebreather mask.Past medical history was signifi cant for diabetes and hypertension.Family,social and medication history were non-contributory.展开更多
Our IP Base Station Controller offers the highest capacity in industry, supporting 15,000 Eri. For you, it means lower implementation cost and higher availability. We also offer the lightest BTS in industry (2kg) and ...Our IP Base Station Controller offers the highest capacity in industry, supporting 15,000 Eri. For you, it means lower implementation cost and higher availability. We also offer the lightest BTS in industry (2kg) and the most energy efficient equipment, reducing your power bills with 40-60 percent. Furthermore, ZTE is the only one to this day offering both modular BTS and split BBU/RRU base station solutions. The result for you is better signal quality and lower cost of networking. So far, we have installed over 15 million lines for 60 operators in 50 countries.展开更多
One day,Jack was reading a cartoon book in class．Unfortunately,he was noticed by the teacher．Then,the teacher came to him and asked seriously,“What are you doing?”Jack answered immediately,“Sir．I’m looking for ...One day,Jack was reading a cartoon book in class．Unfortunately,he was noticed by the teacher．Then,the teacher came to him and asked seriously,“What are you doing?”Jack answered immediately,“Sir．I’m looking for something．”“Looking for what?”asked the teacher．展开更多
2020 was a time fraught with difficulties.Back to January 23rd,the day of the lockdown of Wuhan city,at that time,no one would know the world would be so strange in the followin year.Thousands of words cannot express ...2020 was a time fraught with difficulties.Back to January 23rd,the day of the lockdown of Wuhan city,at that time,no one would know the world would be so strange in the followin year.Thousands of words cannot express the tharks to doctors,nurses,experts...in every field and normal people who are dedicated to combating the pandemic and pursuing their own lives.Also,at the same time,those beautifol souls sleeping in 2020 deserve to be remembered by us forever.展开更多
目标检测是计算机视觉领域的研究热点和基础任务,其中基于锚点(Anchor)的目标检测已在众多领域得到广泛应用。当前锚点选取方法主要面临两个问题:基于特定数据集的先验取值尺寸固定、面对不同场景泛化能力弱。计算锚框的无监督K-means算...目标检测是计算机视觉领域的研究热点和基础任务,其中基于锚点(Anchor)的目标检测已在众多领域得到广泛应用。当前锚点选取方法主要面临两个问题:基于特定数据集的先验取值尺寸固定、面对不同场景泛化能力弱。计算锚框的无监督K-means算法,受初始值影响较大,对目标尺寸较单一的数据集聚类产生的锚点差异较小,无法充分体现网络多尺度输出的特点。针对上述问题,本文提出一种基于多尺度的目标检测锚点构造方法(multi-scale-anchor,MSA),将聚类产生的锚点根据数据集本身的特性进行尺度的缩放和拉伸,优化的锚点即保留原数据集的特点也体现了模型多尺度的优势。另外,本方法应用在训练的预处理阶段,不增加模型推理时间。最后,选取单阶段主流算法YOLO(You Only Look Once),在多个不同场景的红外或工业场景数据集上进行丰富的实验。结果表明,多尺度锚点优化方法MSA能显著提高小样本场景的检测精度。展开更多
Dear Grandpa Zhong,You are my hero and the person I learn from.I really can’t tell how much I respect and love you.You have spent your life in the field of medicine.You have devoted yourself to medical research and l...Dear Grandpa Zhong,You are my hero and the person I learn from.I really can’t tell how much I respect and love you.You have spent your life in the field of medicine.You have devoted yourself to medical research and looking after patients.展开更多
Your eyes are an importantpart of your body.You need to take care of them and keep them healthy.First,have a good diet.Eating good food gives your eyes important vitamins.Wear sunglasses to protect your eyes from UV r...Your eyes are an importantpart of your body.You need to take care of them and keep them healthy.First,have a good diet.Eating good food gives your eyes important vitamins.Wear sunglasses to protect your eyes from UV rays.Take breaks from looking at your computer or phone.Looking at a screen can make your eyes tired.展开更多
To meet rising demand for its fully automated and digitised fabric and part handling solutions,Eton Systems-a member of TMAS,the Swedish textile machinery association-has just moved into modernised new premises in Bor...To meet rising demand for its fully automated and digitised fabric and part handling solutions,Eton Systems-a member of TMAS,the Swedish textile machinery association-has just moved into modernised new premises in Bor?s.The company was founded in 1967 in Bor?s-widely known as Sweden's textile city and home to worldwide brands and companies,as well as the prestigious Swedish School of Textiles-as a result of future-looking research and development at shirt maker Eton Shirts.展开更多
The perfect jacket for anyone looking for a technical allrounder.The Alto Guide is perfect for everything from day hikes to first adventures in mountaineering.Durable stretch Mammut DRYtechnology^(TM)Pro 3-layer mater...The perfect jacket for anyone looking for a technical allrounder.The Alto Guide is perfect for everything from day hikes to first adventures in mountaineering.Durable stretch Mammut DRYtechnology^(TM)Pro 3-layer material is breathable,waterproof and PFC-free.Multiple features,which include backpack-compatible front pockets,a helmet-compatible hood with reinforced peak,and a 2-way zipper for easy climbing harness access,make the hard-wearing Alto Guide an ideal weatherproof jacket for mountain and hiking tours.A smart choice for your mountain sport adventures:technical,functional and durable.展开更多
Julie:What are you looking at,Sam?Sam:Oh,hi,Julie.I'm looking at Fairview City's weekly snowfall update.Julie:But it's only Monday.Sam:I know.The update is for last week's snowfall.Julie:I see.It's...Julie:What are you looking at,Sam?Sam:Oh,hi,Julie.I'm looking at Fairview City's weekly snowfall update.Julie:But it's only Monday.Sam:I know.The update is for last week's snowfall.Julie:I see.It'sforthesecond weekofthis month,then.Sam:That's right.The datesare from December 8 to December 14.展开更多
Drone or unmanned aerial vehicle(UAV)technology has undergone significant changes.The technology allows UAV to carry out a wide range of tasks with an increasing level of sophistication,since drones can cover a large ...Drone or unmanned aerial vehicle(UAV)technology has undergone significant changes.The technology allows UAV to carry out a wide range of tasks with an increasing level of sophistication,since drones can cover a large area with cameras.Meanwhile,the increasing number of computer vision applications utilizing deep learning provides a unique insight into such applications.The primary target in UAV-based detection applications is humans,yet aerial recordings are not included in the massive datasets used to train object detectors,which makes it necessary to gather the model data from such platforms.You only look once(YOLO)version 4,RetinaNet,faster region-based convolutional neural network(R-CNN),and cascade R-CNN are several well-known detectors that have been studied in the past using a variety of datasets to replicate rescue scenes.Here,we used the search and rescue(SAR)dataset to train the you only look once version 5(YOLOv5)algorithm to validate its speed,accuracy,and low false detection rate.In comparison to YOLOv4 and R-CNN,the highest mean average accuracy of 96.9%is obtained by YOLOv5.For comparison,experimental findings utilizing the SAR and the human rescue imaging database on land(HERIDAL)datasets are presented.The results show that the YOLOv5-based approach is the most successful human detection model for SAR missions.展开更多
The vague correlation between the popularity of a literary genre and the age of human society becomes tangible when looking retrospectively at the rise and the decline of a particular generic form at a certain histori...The vague correlation between the popularity of a literary genre and the age of human society becomes tangible when looking retrospectively at the rise and the decline of a particular generic form at a certain historical moment.Doubtlessly,science fiction has become one of the most popular genres of today’s generation.No matter in terms of what disciplinary field our times is defined-information era,globalization,or the broad postmodernism-science fiction prevails worldwide.The rise of Chinese science fiction in recent years,in particular sci-firealism,has been demonstrated by Chinese authors who have gained international recognition and an on-going heated discussion on Chinese social networks,raising questions about the origin of the genre of science fiction,which has long been believed to be exclusively Western.展开更多
[问][386]《大学英语·精读》(翟象俊主编)第一册的第七单元TheSampler讲述了一位家境败落却不失尊严的老人的故事。作者在描绘这位年长的绅士时用了“elderly”一词: She was still speaking when anelderly gentleman limped up t...[问][386]《大学英语·精读》(翟象俊主编)第一册的第七单元TheSampler讲述了一位家境败落却不失尊严的老人的故事。作者在描绘这位年长的绅士时用了“elderly”一词: She was still speaking when anelderly gentleman limped up to thecounter and began looking closely at therow of puddings with great interest.就在她讲这话的时候,一位上了年纪的先生一瘸一拐地走到了柜台前,开始对着那排布丁兴致勃勃地仔细看了起来。展开更多
文摘At the beginning of 2017,on behalf of the Editorial Board of Green Energy&Environment(GEE),we wish all of our readers,authors and reviewers a very happy and successful2017.Looking back to 2016,GEE has received many submissions from many countries all over the world since it was launched in April 2016.In the former three issues published,we remain committed to delivering those articles which should be
基金Supported by the National Natural Science Foundation of China(51009040)National Defence Key Laboratory of Autonomous Underwater Vehicle Technology(2008002)Scientific Service Special Funds of University in China(E091002)
文摘A method of underwater simultaneous localization and mapping （SLAM） based on forward-looking sonar was proposed in this paper. Positions of objects were obtained by the forward-looking sonar, and an improved association method based on an ant colony algorithm was introduced to estimate the positions. In order to improve the precision of the positions, the extended Kalman filter （EKF） was adopted. The presented algorithm was tested in a tank, and the maximum estimation error of SLAM gained was 0.25 m. The tests verify that this method can maintain better association efficiency and reduce navigatioJ~ error.
文摘Dear editor,A 76-year-old Chinese female presented by ambulance to the Emergency Department complaining of dizziness,headache and fatigue.Her son claimed that the patient“turned blue”three hours prior to onset of the patient’s symptoms.Paramedics noted the patient’s SpO2 was 83%on room air with no improvement with a nonrebreather mask.Past medical history was signifi cant for diabetes and hypertension.Family,social and medication history were non-contributory.
文摘Our IP Base Station Controller offers the highest capacity in industry, supporting 15,000 Eri. For you, it means lower implementation cost and higher availability. We also offer the lightest BTS in industry (2kg) and the most energy efficient equipment, reducing your power bills with 40-60 percent. Furthermore, ZTE is the only one to this day offering both modular BTS and split BBU/RRU base station solutions. The result for you is better signal quality and lower cost of networking. So far, we have installed over 15 million lines for 60 operators in 50 countries.
文摘One day,Jack was reading a cartoon book in class．Unfortunately,he was noticed by the teacher．Then,the teacher came to him and asked seriously,“What are you doing?”Jack answered immediately,“Sir．I’m looking for something．”“Looking for what?”asked the teacher．
文摘2020 was a time fraught with difficulties.Back to January 23rd,the day of the lockdown of Wuhan city,at that time,no one would know the world would be so strange in the followin year.Thousands of words cannot express the tharks to doctors,nurses,experts...in every field and normal people who are dedicated to combating the pandemic and pursuing their own lives.Also,at the same time,those beautifol souls sleeping in 2020 deserve to be remembered by us forever.
文摘目标检测是计算机视觉领域的研究热点和基础任务,其中基于锚点(Anchor)的目标检测已在众多领域得到广泛应用。当前锚点选取方法主要面临两个问题:基于特定数据集的先验取值尺寸固定、面对不同场景泛化能力弱。计算锚框的无监督K-means算法,受初始值影响较大,对目标尺寸较单一的数据集聚类产生的锚点差异较小,无法充分体现网络多尺度输出的特点。针对上述问题,本文提出一种基于多尺度的目标检测锚点构造方法(multi-scale-anchor,MSA),将聚类产生的锚点根据数据集本身的特性进行尺度的缩放和拉伸,优化的锚点即保留原数据集的特点也体现了模型多尺度的优势。另外,本方法应用在训练的预处理阶段,不增加模型推理时间。最后,选取单阶段主流算法YOLO(You Only Look Once),在多个不同场景的红外或工业场景数据集上进行丰富的实验。结果表明,多尺度锚点优化方法MSA能显著提高小样本场景的检测精度。
文摘Dear Grandpa Zhong,You are my hero and the person I learn from.I really can’t tell how much I respect and love you.You have spent your life in the field of medicine.You have devoted yourself to medical research and looking after patients.
文摘Your eyes are an importantpart of your body.You need to take care of them and keep them healthy.First,have a good diet.Eating good food gives your eyes important vitamins.Wear sunglasses to protect your eyes from UV rays.Take breaks from looking at your computer or phone.Looking at a screen can make your eyes tired.
文摘To meet rising demand for its fully automated and digitised fabric and part handling solutions,Eton Systems-a member of TMAS,the Swedish textile machinery association-has just moved into modernised new premises in Bor?s.The company was founded in 1967 in Bor?s-widely known as Sweden's textile city and home to worldwide brands and companies,as well as the prestigious Swedish School of Textiles-as a result of future-looking research and development at shirt maker Eton Shirts.
文摘The perfect jacket for anyone looking for a technical allrounder.The Alto Guide is perfect for everything from day hikes to first adventures in mountaineering.Durable stretch Mammut DRYtechnology^(TM)Pro 3-layer material is breathable,waterproof and PFC-free.Multiple features,which include backpack-compatible front pockets,a helmet-compatible hood with reinforced peak,and a 2-way zipper for easy climbing harness access,make the hard-wearing Alto Guide an ideal weatherproof jacket for mountain and hiking tours.A smart choice for your mountain sport adventures:technical,functional and durable.
文摘Julie:What are you looking at,Sam?Sam:Oh,hi,Julie.I'm looking at Fairview City's weekly snowfall update.Julie:But it's only Monday.Sam:I know.The update is for last week's snowfall.Julie:I see.It'sforthesecond weekofthis month,then.Sam:That's right.The datesare from December 8 to December 14.
文摘Drone or unmanned aerial vehicle(UAV)technology has undergone significant changes.The technology allows UAV to carry out a wide range of tasks with an increasing level of sophistication,since drones can cover a large area with cameras.Meanwhile,the increasing number of computer vision applications utilizing deep learning provides a unique insight into such applications.The primary target in UAV-based detection applications is humans,yet aerial recordings are not included in the massive datasets used to train object detectors,which makes it necessary to gather the model data from such platforms.You only look once(YOLO)version 4,RetinaNet,faster region-based convolutional neural network(R-CNN),and cascade R-CNN are several well-known detectors that have been studied in the past using a variety of datasets to replicate rescue scenes.Here,we used the search and rescue(SAR)dataset to train the you only look once version 5(YOLOv5)algorithm to validate its speed,accuracy,and low false detection rate.In comparison to YOLOv4 and R-CNN,the highest mean average accuracy of 96.9%is obtained by YOLOv5.For comparison,experimental findings utilizing the SAR and the human rescue imaging database on land(HERIDAL)datasets are presented.The results show that the YOLOv5-based approach is the most successful human detection model for SAR missions.
文摘The vague correlation between the popularity of a literary genre and the age of human society becomes tangible when looking retrospectively at the rise and the decline of a particular generic form at a certain historical moment.Doubtlessly,science fiction has become one of the most popular genres of today’s generation.No matter in terms of what disciplinary field our times is defined-information era,globalization,or the broad postmodernism-science fiction prevails worldwide.The rise of Chinese science fiction in recent years,in particular sci-firealism,has been demonstrated by Chinese authors who have gained international recognition and an on-going heated discussion on Chinese social networks,raising questions about the origin of the genre of science fiction,which has long been believed to be exclusively Western.
文摘[问][386]《大学英语·精读》(翟象俊主编)第一册的第七单元TheSampler讲述了一位家境败落却不失尊严的老人的故事。作者在描绘这位年长的绅士时用了“elderly”一词: She was still speaking when anelderly gentleman limped up to thecounter and began looking closely at therow of puddings with great interest.就在她讲这话的时候,一位上了年纪的先生一瘸一拐地走到了柜台前,开始对着那排布丁兴致勃勃地仔细看了起来。
