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Frame-indifference of cross products,rotations,and the permutation tensor

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Theoretical & Applied Mechanics Letters 2020年第2期10卷 116-119页

作者： maolin du Department of Civil Engineering Sanjiang UniversityNanjing 210012China

Under improper transformations,the traditional transformation laws for cross products,the permutation tensor,and rotations are *** a cross product,using a counter-example the left-hand rule is proved *** unique rule for a cross product is the right-hand *** systems have handedness,while a cross product is *** the permutation tensor is defined as a triple product including a cross product,the law for the permutation tensor is *** a rotation,its pseudovector representation is incorrect,because the mirror is an auxiliary device to produce the virtual image rather than a new coordinate system or reference frame.

关键词： Pseudovector Cross product Improper transformation Handed coefficient Permutation tensor

Recent advances in probiotics oral delivery systems targeting the inflammatory bowel disease: Types， mechanisms and perspectives

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Food Science and Human Wellness 2024年

作者： Yaxin Yin Xiaoqun Zeng Zhen Wu Qiwei du Tao Zhang Daodong Pan Ming du maolin Tu State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-products， Ningbo University Key Laboratory of Animal Protein Food Deep Processing Technology of Zhejiang Province， Zhejiang-Malaysia Joint Research Laboratory for Agricultural Product Processing and Nutrition， College of Food Science and Engineering， Ningbo University School of Food Science and Technology， National Engineering Research Center of Seafood， Collaborative Innovation Center of Seafood Deep Processing， Dalian Polytechnic University

Inflammatory bowel disease (IBD) influences several million people around the globe， with a high prevalence in North America and Europe. Results from the studies about host-gut microbial interactions demonstrated that gut microbiota plays a critical role in the progression of IBD， and probiotics can significantly improve microflora dysbiosis and inflammatory response caused by intestinal pathogens. However， several limitations existed for the probiotics delivered to the intestine in the free form (non-encapsulated)， such as low pH and diverse digestive enzymes in the gastrointestinal tract， etc. To overcome the problems， several probiotic delivery systems were established and verified with effects. Here， the types and applications of probiotics in animal models and clinical studies are firstly reviewed in this paper. Subsequently， various types of probiotic delivery systems are elaborated， containing the well-known microcapsules and hydrogel delivery systems， and the engineered probiotic delivery systems are also introduced. Furthermore， mechanism of action associated with probiotics are illustrated， including maintaining gut microbiota barrier balance， modulating the immune response， and alleviating oxidative stress， etc. Finally， we discussed the relative advantages and disadvantages of different encapsulation methods， as well as future trends for further development of probiotic delivery systems with health benefits.

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刚体在固定面上纯滚时接触点的速度和加速度

力学与实践 2006年第5期28卷 79-81页

作者：杜茂林解放军理工大学力学教研室南京210007

在微小的时间间隔内,应用加速度合成定理和刚体上一点的加速度公式,推导出了接触点的加速度公式．加速度方向为运动刚体表面在该处的法线方向,大小与动接触线和定接触线的曲率半径和刚体运动的角速度有关．利用接触点的运动性质,不仅有... 详细信息

在微小的时间间隔内,应用加速度合成定理和刚体上一点的加速度公式,推导出了接触点的加速度公式．加速度方向为运动刚体表面在该处的法线方向,大小与动接触线和定接触线的曲率半径和刚体运动的角速度有关．利用接触点的运动性质,不仅有助于解答圆球在固定圆球面或圆柱在固定圆柱面上的纯滚问题,而且为求解一般形状刚体在任意固定曲面上的纯滚问题提供了方便．

关键词：运动学纯滚约束加速度动接触线定接触线

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太空拔河胜负分析

力学与实践 2006年第3期28卷 77-78页

作者：杜茂林解放军理工大学力学教研室南京210007

导出太空拔河不分胜负结论的主要原因,是没有注意到两拔河者和绳子组成的质点系的质心一般不与绳子上一个固定点始终重合．经运动和动力分析,推导出了绳子的加速度公式和绳子的张力公式．公式表明,太空拔河取胜的因素是拔河者的力气和质... 详细信息

导出太空拔河不分胜负结论的主要原因,是没有注意到两拔河者和绳子组成的质点系的质心一般不与绳子上一个固定点始终重合．经运动和动力分析,推导出了绳子的加速度公式和绳子的张力公式．公式表明,太空拔河取胜的因素是拔河者的力气和质量;拔河者相对于绳子的相对加速度大小体现了其力气大小;绳子的张力与二拔河者的质量和力气有关．

关键词：理论力学太空拔河质点系质心

Development and application of novel high‐efficiency composite ultrafine cement grouts for roadway in fractured surrounding rocks

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Deep Underground Science and Engineering 2024年第1期3卷 53-69页

作者： maolin Tian Shaojie Chen Lijun Han Hongtian Xiao Shandong Key Laboratory of Civil Engineering Disaster Prevention and Mitigation Shandong University of Science and TechnologyQingdaoChina College of Civil Engineering and Architecture Shandong University of Science and TechnologyQingdaoChina College of Energy and Mining Engineering Shandong University of Science and TechnologyQingdaoChina State Key Laboratory for Geomechanics and Deep Underground Engineering China University of Mining and TechnologyXuzhouChina

The fractured surrounding rocks of roadways pose major challenges to safe *** has often been used to reinforce the surrounding rocks to mitigate the safety risks associated with fractured *** aim of this study is to develop highly efficient composite ultrafine cement(CUC)grouts to reinforce the roadway in fractured surrounding *** materials used are ultrafine cement(UC),ultrafine fly ash(UF),ultrafine slag(US),and additives(superplasticizer[SUP],aluminate ultrafine expansion agent[AUA],gypsum,and retarder).The fluidity,bleeding,shrinkage,setting time,chemical composition,microstructure,degree of hydration,and mechanical property of grouting materials were evaluated in this ***,a suitable and effective CUC grout mixture was used to reinforce the roadway in the fractured surrounding *** results have shown that the addition of UF and US reduces the plastic viscosity of CUC,and the best fluidity can be obtained by adding 40%UF and 10%*** UC and UF particles are small,the pozzolanic effect of UF promotes the hydration reaction,which is conductive to the stability of CUC *** addition,fine particles of UC,UF,and US can effectively fill the pores,while the volumetric expansion of AUA and gypsum decreases the pores and thus affects the microstructure of the solidified *** compressive test results have shown that the addition of specific amounts of UF and US can ameliorate the mechanical properties of CUC ***,the CUC22‐8 grout was used to reinforce the No.20322 belt *** results of numerical simulation and field monitoring have indicated that grouting can efficaciously reinforce the surrounding rock of the *** this research,high‐performance CUC grouts were developed for surrounding rock reinforcement of underground engineering by utilizing UC and some additives.

关键词： broken surrounding rock composite ultrafine cement(CUC)grouts grouting material grouting performance grouting reinforcement

Detection Algorithm of Laboratory Personnel Irregularities Based on Improved YOLOv7

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Computers, Materials & Continua 2024年第2期78卷 2741-2765页

作者： Yongliang Yang Linghua Xu maolin Luo Xiao Wang Min Cao School of Electrical Engineering Guizhou UniversityGuiyang550025China

due to the complex environment of the university laboratory,personnel flow intensive,personnel irregular behavior is easy to cause security *** using mainstream detection algorithms suffers from low detection accuracy and slow ***,the current management of personnel behavior mainly relies on institutional constraints,education and training,on-site supervision,etc.,which is time-consuming and *** the above situation,this paper proposes an improved You Only Look Once version 7(YOLOv7)to achieve the purpose of quickly detecting irregular behaviors of laboratory personnel while ensuring high detection ***,to better capture the shape features of the target,deformable convolutional networks(DCN)is used in the backbone part of the model to replace the traditional convolution to improve the detection accuracy and ***,to enhance the extraction of important features and suppress useless features,this paper proposes a new convolutional block attention module_efficient channel attention(CBAM_E)for embedding the neck network to improve the model’s ability to extract features from complex ***,to reduce the influence of angle factor and bounding box regression accuracy,this paper proposes a newα-SCYLLA intersection over union(α-SIoU)instead of the complete intersection over union(CIoU),which improves the regression accuracy while increasing the convergence *** experiments on public and homemade datasets show that the improved algorithm outperforms the original algorithm in all evaluation indexes,with an increase of 2.92%in the precision rate,4.14%in the recall rate,0.0356 in the weighted harmonic mean,3.60%in the mAP@0.5 value,and a reduction in the number of parameters and *** with the mainstream algorithm,the improved algorithm has higher detection accuracy,faster convergence speed,and better actual recognition effect,indicating the effectiveness of the improved algorithm in this p

关键词： University laboratory personnel behavior YOLOv7 deformable convolutional networks attention module intersection over union

High-performance self-powered GaN/PEDOT:PSS hybrid heterojunction UV photodetector for optical communication

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Science China(Technological Sciences) 2024年第2期67卷 608-615页

作者： LI Shan LIU Zeng ZHANG maolin YANG LiLi GUO YuFeng TANG WeiHua College of Integrated Circuit Science and Engineering&National and Local Joint Engineering Laboratory for RF Integration and Micro-Packing Technologies Nanjing University of Posts and TelecommunicationsNanjing 210023China

Self-powered ultraviolet photodetectors(UVPDs)provide great possibility for the next-generation energy conservation optical communication technology;while the high photodetection performance at zero bias is still a tremendous ***,ntype GaN film with Si-doping concentration of~1018cm^(-3)and p-type organic PEDOT:PSS were adopted to construct a planar hybrid heterojunction via the simple spin-coating *** from typical type-Ⅱenergy band alignment and giant photovoltaic effect at GaN/PEDOT:PSS inorganic-organic interface,the fabricated UVPD achieved excellent self-powered photoelectrical properties in dual-band with large R of 0.96 A/W(2.8 A/W),superior D*of 5.7×1012Jones(1.7×10^(13)Jones),prominent EQE of 325%(1371%),high on/off ratio of 9.65×10^(3)(6.15×10^(3))and fast rise/decay time of 60.7/124.5 ms(30.9/26.7 ms)for UVA(UVC)band,as well as outstanding UV/visible rejection ratio and great detection *** as an optical signal receiver,this designed self-powered UVPD decoded a message of“NJUPT”from a simple optical communication *** results open a new avenue for GaN/PEDOT:PSS heterojunction in UV communications and related applications.

关键词： GaN UV photodetector self-powered heterojunction optical communication

Cancer mortality in Inner Mongolia of China, 2008-2010

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Open Journal of Epidemiology 2014年第1期4卷 14-18页

作者： Ying Yang Fengyun Zuo maolin du Zhiyue Liu Zhijun Li Wenfang Guo Juan Sun Department of Public Health Inner Mongolia Medical University Hohhot China

Objective: The aim of our study was to determine the status of the common cancer in Inner Mongolia of China. Methods: We obtained data from the Centers for Disease Control in the Inner Mongolia from five monitoring points of DRS in Inner Mongolia from 2008 to 2010. We calculated the crude mortality, the proportion of all cause of death during the three years, further calculated cancer mortality, the proportion of cancer death and PYLL by genders. Results: during the period 2008-2010, the crude mortality of all cause of death is 518.02 per million in Inner Mongolia. As the second most common cause of death, the mortality dying from cancer is 127.11 per million, accounting for over one fifth of all deaths. Among all deaths from cancer, the lung cancer had the highest mortality rates (46.25 per million in males and 17.95 per million in females) and PYLL (0.72 in males and 0.41 in females), followed by the liver cancer (23.76 per million) and the gastric cancer (16.15 per million). The female breast cancer is the fourth leading cancer from mortality and PYLL for 7.65 per million and 0.17. Conclusion: Our analysis determined the severity of cancer death in Inner Mongolia of China from 2008 to *** study found that the cancer mortality in Inner Mongolia is lower than Chinese average level and most west countries, higher than some Africa countries. Our results will guide future cancer control strategies in Inner Mongolia of China.

关键词： Cancer Mortality Cause of Death

Bone Cancer Mortality in Inner Mongolia from 2008 to 2012

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Open Journal of Epidemiology 2015年第1期5卷 59-64页

作者： Wenfang Guo Wenli Hao maolin du Zhuang Su Yuelin Hu Yuan Xia Xiong Su Juan Sun Inner Mongolia Medical University Hohhot China

Objective: The aim of our study was to assess bone cancer mortality and the related social factors in Inner Mongolia in China. Methods: We obtained data from the Centers for Disease Control in Inner Mongolia from five monitoring points of the Death Registry System in Inner Mongolia from 2008 to 2012. We calculated the crude mortality rate for bone cancer. The χ2 test was used to examine differences in bone cancer mortality rates between sexes and years. Unconditional logistic regressions were applied to analyze the effect of socio-demographic characteristics by sex. Results: Between 2008 and 2012, the crude mortality rate of bone cancer was 1.12/100000 (95% confidence interval = 1.02-1.21). The bone cancer mortality was 2.24 in men and 1.25 in women, resulting in a male-female ratio of 1.8. No between-year difference in the mortality rate was observed between 2008 and 2012 (men: χ2 = 4.65, P = 0.325;women: χ2 = 2.21, P = 0.698). In general, mortality increased with increasing age. People with a lower education level exhibited an increased risk of bone cancer among both men and women. Jobs involving extensive manual labor decreased the likelihood of bone cancer mortality, and the odds ratio was higher for men than women (0.6 vs. 0.45). Unmarried people had a higher risk for bone cancer than married people. Conclusion: The mortality rate of bone cancer was not significantly different between men and women from 2008 to 2012. The risk of bone cancer increased with age among both sexes. Unmarried people and those with a low education status had an elevated risk of bone cancer, whereas employment in a field involving extensive manual labor appeared to be a protective factor against bone cancer.

关键词： Bone Cancer Mortality Cause of Death