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Continuous-Time Channel Prediction Based on Tensor Neural Ordinary Differential Equation

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China Communications 2024年第1期21卷 163-174页

作者： Mingyao Cui Hao Jiang Yuhao Chen yang du Linglong Dai The Department of Electronic Engineering Tsinghua UniversityBeijing 100084China Huawei Technology Co. Ltd.Chengdu Research InstituteChengdu 611730China

Channel prediction is critical to address the channel aging issue in mobile *** channel prediction techniques are mainly designed for discrete channel prediction,which can only predict the future channel in a fixed time slot per frame,while the other intra-frame channels are usually recovered by ***,these approaches suffer from a serious interpolation loss,especially for mobile millimeter-wave *** solve this challenging problem,we propose a tensor neural ordinary differential equation(TN-ODE)based continuous-time channel prediction scheme to realize the direct prediction of intra-frame ***,inspired by the recently developed continuous mapping model named neural ODE in the field of machine learning,we first utilize the neural ODE model to predict future continuous-time *** improve the channel prediction accuracy and reduce computational complexity,we then propose the TN-ODE scheme to learn the structural characteristics of the high-dimensional channel by low-dimensional learnable *** results show that the proposed scheme is able to achieve higher intra-frame channel prediction accuracy than existing schemes.

关键词： channel prediction massive multipleinput-multiple-output millimeter-wave communications ordinary differential equation

Effect of dietary supplement of inactivated Lactobacillus plantarum Ep-M 17 on growth performance,immune response,disease resistance,and intestinal microbiota in Penaeus vannamei

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Journal of Oceanology and Limnology 2024年第2期42卷 676-694页

作者： Ting WU Xiaoman HU Wenlong XU yang du Jiong CHEN State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-products Ningbo UniversityNingbo 315211China Laboratory of Biochemistry and Molecular Biology School of Marine SciencesNingbo UniversityNingbo 315211China Key Laboratory of Applied Marine Biotechnology of Ministry of Education Ningbo UniversityNingbo 315211China

Our previous study found that feeding with Lactobacillus plantarum Ep-M17 could effectively affect the growth performance,immune response,and gut microbiota of Penaeus ***,high temperature and pressure during feed pelletizing is the main problem that can lead to a decrease in the activity of probiotics or cause their *** investigation needs to investigate whether inactivated Ep-M17 can exert similar effects as live ***,we evaluated the effects of inactivated *** Ep-M17 on growth performance,immune response,disease resistance,and gut microbiota in *** show that adding inactivated Ep-M17 to the feed also promoted body weight gain and increased relative immune protection in ***,histological examination revealed that the administration of inactivated Ep-M17 led to improvements in the density and distribution of microvilli in the intestines and enhancements in the abundance of B and R cells in the ***,the inactivated Ep-M17 supplementation resulted in increased activity levels of nutrient immune-related enzymes in both the shrimp hepatopancreas and ***,it stimulated the expression of Lvlec,PEN-3a,Crustin,LGBP,Lysozyme,and proPo genes in both the hepatopancreas and ***,the inactivated Ep-M17 also increased bacterial diversity in the gut of shrimp and promoted the abundance of specific flora,facilitating the host organism’s metabolism and immunity to improve the disease resistance of ***,supplementation of inactivated *** Ep-M17 in shrimp diets can exert similar effects as live *** Ep-M17 effectively improving growth performance,gut microbiota,immune response,and disease resistance in ***.

关键词： Penaeus vannamei Lactobacillus plantarum Ep-M17 inactivated probiotics immune response gut flora

微尺度下基于对流混合的充填不平衡影响因素数值模拟分析

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材料工程 2024年第8期52卷 212-218页

作者：刘洋徐斌王邱宇杜洋西南科技大学制造科学与工程学院四川绵阳621010

针对流道中采用对流混合的充填不平衡新的调控方法,通过数值模拟研究了微尺度聚合物熔体流动因素对流道熔体温度分布调控特性的影响。以“H”型流道作为研究对象,在流道中布局了对流混合装置。采用单因素的实验方法研究熔体温度、对流... 详细信息

针对流道中采用对流混合的充填不平衡新的调控方法,通过数值模拟研究了微尺度聚合物熔体流动因素对流道熔体温度分布调控特性的影响。以“H”型流道作为研究对象,在流道中布局了对流混合装置。采用单因素的实验方法研究熔体温度、对流换热系数、流道系统对熔体充填不平衡的影响。数值模拟结果表明:绝热边界条件时,升高熔体温度伴随着熔体自身黏度的下降,对称点之间的温差减小,改善了充填不平衡,对流换热边界时,升高熔体温度加大了熔体通过壁面散失的热量,对称点之间的温差加大,充填不平衡越明显;对流换热系数越小,熔体与壁面之间的导热效率越低,熔体平均温度较高,增加了对称点之间的温差,加剧了充填不平衡;随着流道系统的减小,微尺度效应减弱,可以降低对称点间的温差,充填不平衡的现象得到了较好的改善。其中对流换热系数对充填不平衡的影响最大,其次是流道系统,最后是熔体温度。

关键词：对流混合熔体温度对流换热系数流道系统充填不平衡

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以一致性的政策推动高质量充分就业

中国人口科学 2024年第1期38卷 3-7页

作者：都阳中国社会科学院人口与劳动经济研究所

为深入学习领会中央经济工作会议精神,在推动高质量发展中发挥哲学社会科学研究的作用,本刊编辑部特邀中国社会科学院人口与劳动经济研究所所长都阳研究员、中国社会科学院农村发展研究所党委书记杜志雄研究员、复旦大学六次产业研究院... 详细信息

为深入学习领会中央经济工作会议精神,在推动高质量发展中发挥哲学社会科学研究的作用,本刊编辑部特邀中国社会科学院人口与劳动经济研究所所长都阳研究员、中国社会科学院农村发展研究所党委书记杜志雄研究员、复旦大学六次产业研究院常务副院长王小林教授,分别就推动高质量充分就业、促进农民增收、扎牢社会保障网等内容进行了阐释解读。

关键词：社会保障网中国社会科学院劳动经济研究高质量充分就业促进农民增收哲学社会科学研究六次产业高质量发展

Transcription factor OsWRKY11 induces rice heading at low concentrations but inhibits rice heading at high concentrations

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Journal of Integrative Plant Biology 2024年第7期66卷 1385-1407页

作者： Lirong Zhao Yunwei Liu Yi Zhu Shidie Chen yang du Luyao Deng Lei Liu Xia Li Wanqin Chen Zhiyu Xu yangyang Xiong You Ming Siyu Fang Ligang Chen Houping Wang Diqiu Yu CAS Key Laboratory of Tropical Plant Resources and Sustainable Use Xishuangbanna Tropical Botanical GardenThe Chinese Academy of SciencesMengla 666303China College of Life Sciences University of Chinese Academy of SciencesBeijing 101408China State Key Laboratory for Conservation and Utilization of Bio‐resources in Yunnan Yunnan UniversityKunming 650500China School of Life Sciences Yunnan UniversityKunming 650500China Southwest United Graduate School Yunnan UniversityKunming 650092China

The heading date of rice is a crucial agronomic characteristic that influences its adaptability to different regions and its productivity *** the involvement of WRKY transcription factors in various biological processes related to development,the precise mechanisms through which these transcription factors regulate the heading date in rice have not been well *** present study identified OsWRKY11 as a WRKY transcription factor which exhibits a pivotal function in the regulation of the heading date in rice through a comprehensive screening of a clustered regularly interspaced palindromic repeats(CRISPR)-CRISPR-associated nuclease 9 mutant library that specifically targets the WRKY genes in *** heading date of oswrky11 mutant plants and OsWRKY11-overexpressing plants was delayed compared with that of the wild-type plants under short-day and long-day *** investigation revealed that OsWRKY11 exerts dual effects on transcriptional promotion and suppression through direct and indirect DNA binding,*** normal conditions,OsWRKY11 facilitates flowering by directly inducing the expression of OsMADS14 and *** presence of elevated levels of OsWRKY11 protein promote formation of a ternary protein complex involving OsWRKY11,Heading date 1(Hd1),and Days to heading date 8(DTH8),and this complex then suppresses the expression of Ehd1,which leads to a delay in the heading *** investigation revealed that a mild drought condition resulted in a modest increase in OsWRKY11 expression,promoting ***,under severe drought conditions,a significant upregulation of OsWRKY11 led to the suppression of Ehd1 expression,ultimately causing a delay in heading *** findings uncover a previously unacknowledged mechanism through which the transcription factor OsWRKY11 exerts a dual impact on the heading date by directly and indirectly binding to the promoters of target genes.

关键词： heading date OsWRKY11 rice transcription factors

不同氢气喷孔直径对汽油掺氢X型转子发动机性能及污染物排放的影响

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西安交通大学学报 2024年第2期58卷 66-78页

作者：张泽奇杜洋杨正浩高旭何光宇西安交通大学机械工程学院西安710049 空军工程大学航空动力系统与等离子体技术全国重点实验室西安710038

针对高效X型转子发动机汽油燃烧不充分的问题,提出了一种缸内直喷掺氢方法用于提升燃烧效率和发动机热力性能。建立了X型转子发动机三维CFD数值模型,通过缸压、放热率和功率实验数据验证了模型有效性,在喷氢总量、喷氢压力、喷氢开始时... 详细信息

针对高效X型转子发动机汽油燃烧不充分的问题,提出了一种缸内直喷掺氢方法用于提升燃烧效率和发动机热力性能。建立了X型转子发动机三维CFD数值模型,通过缸压、放热率和功率实验数据验证了模型有效性,在喷氢总量、喷氢压力、喷氢开始时刻相同的条件下,分析了氢气缸内直喷且汽油预混时氢气喷孔直径对发动机缸内流动、燃烧、热力性能以及污染物排放特性的影响,并与纯汽油预混式发动机性能进行对比,揭示了缸内直喷掺氢方法的优越性。结果表明,在小氢气喷孔直径(2 mm)下,火焰传播比较均匀,且在燃烧室两侧狭缝中都有较大的对称的火焰,燃烧更加充分,发动机指示热效率达到了最高37.07%,较不喷氢和大氢气喷孔直径(4 mm)分别提高了10.23%和7.85%。与大氢气喷孔直径相比,虽然小氢气喷孔直径下NO x排放量上升了21.12%,但是碳氢化合物、碳烟排放量分别下降了79.08%和2.17%。小氢气喷孔直径(2 mm)为最优喷氢方案,研究为X型转子发动机的喷氢方案设计与优化提供了指导。

关键词：转子发动机氢气直喷喷孔直径污染物热效率

Risk factors and clinical significance of posterior slip of the proximal vertebral body after lower lumbar fusion

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World Journal of Clinical Cases 2024年第26期12卷 5885-5892页

作者： Jia-Jun Zhu Yi Wang Jun Zheng Sheng-yang du Lei Cao Yu-Ming yang Qing-Xi Zhang Ding-Ding Xie Department of Spinal Surgery Xuzhou First People’s HospitalXuzhou 221112Jiangsu ProvinceChina Department of Spinal Surgery The Affiliated Xuzhou Municipal Hospital of Xuzhou Medical UniversityXuzhou 221112Jiangsu ProvinceChina Department of Spinal Surgery The Affiliated Hospital of China University of Mining and TechnologyXuzhou 221112Jiangsu ProvinceChina

BACKGROUND Adjacent segment disease(ASD)after fusion surgery is frequently manifests as a cranial segment instability,disc herniation,spinal canal stenosis,spondylolisthesis or *** risk factors and mechanisms of ASD have been widely discussed but never clearly *** To investigate the risk factors and clinical significance of retrograde movement of the proximal vertebral body after lower lumbar *** This was a retrospective analysis of the clinical data of patients who underwent transforaminal lumbar interbody fusion surgery between September 2015 and July 2021 and who were followed up for more than 2 ***-one patients with degenerative lumbar diseases were included(22 males and 69 females),with an average age of 52.3 years(40-73 years).According to whether there was retrograde movement of the adjacent vertebral body on postoperative X-rays,the patients were divided into retrograde and nonretrograde *** sagittal parameters of the spine and pelvis were evaluated before surgery,after surgery,and at the final *** the same time,the Oswestry Disability Index(ODI)and Visual Analogue Scale(VAS)were used to evaluate the patients’quality of *** Nineteen patients(20.9%)who experienced retrograde movement of proximal adjacent segments were included in this *** pelvic incidence(PI)of the patients in the retrograde group were significantly higher than those of the patients in the nonretrograde group before surgery,after surgery and at the final follow-up(P<0.05).There was no significant difference in lumbar lordosis(LL)between the two groups before the operation,but LL in the retrograde group was significantly greater than that in the nonretrograde group postoperatively and at the final *** significant differences were detected in terms of the|PI–LL|,and there was no significant difference in the preoperative lordosis distribution index(LDI)between the two *** LDIs of the retrograde group were

关键词： Adjacent segment disease Posterior vertebral slip Sagittal alignment of spine-pelvis Lower lumbar fusion Quality of life

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生育支持政策的中央事权与顶层设计

人口研究 2024年第2期48卷 3-16页

作者：都阳程杰曲玥中国社会科学院人口与劳动经济研究所

由于人口规模与技术创新之间存在正向关联,因而生育行为具有正外部性(外部收益),且这种外部收益具有地区间不可分割性以及明显的跨期性。获得生育外部收益的最明确的主体是国家,因此,支持和鼓励生育主要是中央事权。生育支持政策的顶层... 详细信息

由于人口规模与技术创新之间存在正向关联,因而生育行为具有正外部性(外部收益),且这种外部收益具有地区间不可分割性以及明显的跨期性。获得生育外部收益的最明确的主体是国家,因此,支持和鼓励生育主要是中央事权。生育支持政策的顶层设计要合理界定中央政府与地方政府之间的权责关系,在宏观和微观层面形成激励相容的政策机制;要抓住制约生育率提升的主要矛盾,从化解女性生育行为与劳动力市场行为之间的冲突这一关键环节入手,优先选择既能鼓励生育又能提高女性就业竞争力的政策工具,个人所得税抵扣就是一项具有多重优势的政策;要注重政策体系的完备性和差异性,既能实现对全体育龄女性的有效覆盖,又能根据群体的差异性特征实施针对性的政策。

关键词：生育支持政策外部性中央事权顶层设计

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可控转角摩擦型铰节点滞回耗能研究

建筑结构 2024年第14期54卷 53-60,68页

作者：赵鹏左龙杜洋中冶建筑研究总院有限公司北京100089

提出一种可控转角摩擦型铰节点,介绍了该节点的构造。利用既有试验对有限元软件ABAQUS模型材料参数进行验证,结果表明,试验结果与数值模拟结果吻合较好。建立25个不同参数的节点模型,探究螺栓预紧力、拼板间摩擦系数、梁固定端距销轴轴... 详细信息

提出一种可控转角摩擦型铰节点,介绍了该节点的构造。利用既有试验对有限元软件ABAQUS模型材料参数进行验证,结果表明,试验结果与数值模拟结果吻合较好。建立25个不同参数的节点模型,探究螺栓预紧力、拼板间摩擦系数、梁固定端距销轴轴心距离、梁连接端肋板厚度、梁连接端肋板外伸长度、节点处肋板厚度、节点处肋板外伸长度共7个变化参数对节点滞回耗能的影响。通过拟合获得的数据,建立了节点摩擦反力提高系数与摩擦系数、节点安全储备系数与摩擦系数的关系曲线。结果表明:当节点转角大于设定转角后,节点产生的限位接触使节点反力大幅增加,实现限制节点转角的目的;摩擦系数在0.35左右耗能最大;在节点转角小于设定转角时,滑动摩擦反力与螺栓预紧力的比值约等于摩擦系数;节点最终破坏的总耗能随螺栓预紧力的增加而增大;螺栓预紧力超过规范规定的设计值时,对节点的累积耗能提高程度不明显;梁固定端距销轴轴心距离在梁高的0.95至2倍时耗能最佳;梁固定端距销轴轴心距离过大时,将降低节点的极限反力;梁连接端肋板厚度、梁连接端肋板外伸长度、节点处肋板厚度和节点处肋板外伸长度对节点滞回性能影响不显著。

关键词：钢结构节点可控转角滞回耗能摩擦型铰节点