检索结果-南通市图书馆

MMSE based joint Tomlinson-Harashima source and linear relay precoder design in non-regenerative MIMO relay system

在线全文

学校读者我要写书评

暂无评论

The Journal of China Universities of Posts and Telecommunications 2012年第4期19卷 56-63页

作者： LI nan CHEN Peng HE zhi-qiang LIN Jia-ru Key Lab of Universal Wireless Communications Ministry of EducationBeijing University of Posts and TelecommunicationsBeijing 100876China

This paper proposes a joint nonlinear transceiver design scheme based on minimum mean square error （MMSE） criterion for non-regenerative multiple input multiple output （MIMO） relay system. The proposed scheme decomposes the error covariance matrix, reformulates the original joint design problem as two separate optimization problems, and then provides a closed-form solution with only local channel state information （CSI） available at the source and destination. Performance evaluation shows that the proposed scheme significantly outperforms linear schemes, and has a competitive performance compared with existing global CSI based nonlinear schemes, both iterative and non-iterative.

关键词： MIMO non-regenerative relay joint transceiver design Tomlinson-Harashima precoding (THP) MMSE

Direct technetium-99m labeling of anti-hepatoma monoclonal antibody fragment:a radioimmunoconjugate for hepatocellular carcinoma imaging

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2000年第3期6卷 348-352页

作者： Hui Jie Bian zhi nan Chen Jing Lan Deng Cell Engineering Research Center Basic Medical.DepartmentFourth Military Medical UniversityXi’an 710032Shaanxi ProvinceChina Department of Clinical Nuclear Medicine Xijing HospitalXi’an 710033Shaanxi ProvinceChina

AIM To directly radiolabel an anti-hepatomamAb fragment HAb18 F（ab’）2 with 99mTc bystannous-reduced method,and assess thestability,biodistribution and radioimmun-oimaging（RⅡ）.METHODS Immunoreactive fraction wasdetermined according to Lindmo’s ***’s reagent was used to determine thenumber of thiols in the reduced F（ab’）2.Labelingefficiency and homogeneity were measured bypaper chromatography,sodium dodecylsulphatepolyacrylamide gel electrophoresis（SDS-PAGE）and *** assay involvedthe incubation of aliquots of labeled antibody inethylenediaminetetraacetate（ EDTA ）and L-cysteine（L-cys）solutions with different molarratio at 37℃ for 1h,*** vivo utilized nude mice bearing humanhepatocellular carcinoma（HHCC）xenograftswith gamma camera imaging and tissuebiodistribution studies at regular *** The labeling procedure was finishedwithin 1.5 h compared with the'pretinning'method which would take at least *** vitrostudies demonstrated that the radiolabeled mAbfragment was homogeneous and retained *** studies indicatedthat 99mTc-labeled HAb18 F（ab’）2 in EDTA is morestable than in *** and biodistribution showed a significant tumor uptake at 24 h post-injection of 99mTc-labeled HAb18 F（ab’）2.Theblood,kidney,liver and tumor uptakes at 24hwere 0.56±0.09,56.45±11.36,1.43±0.27 and6.57±3.01（%ID/g）,*** 99mTc-HAb18 F（ab’）2 conjugateprepared by this direct method appears to be aneffective way to detect hepatoma in nude micemodel.

关键词： antibody monoclonal antibody fragments technetium-99m hepatocellular carcinoma liver neoplasms radioimmunoimaging

Understanding Self-assembly,Colloidal Behavior and Rheological Properties of Graphene Derivatives for High-performance Supercapacitor Fabrication

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2020年第5期38卷 423-434,I0005页

作者： xia-Wei Yun Bo Tang zhi-Yuan Xiong xiao-Gong Wang Department of Chemical Engineering Laboratory of Advanced Materials(Ministry of Education)Tsinghua UniversityBeijing 100084China Department of Chemical and Bio-molecular Engineering The University of MelbourneMelbourneVictoria 3010Australia

Graphene derivatives,such as graphene oxide(GO)and reduced graphene oxide(RGO),have been widely used as promising two-dimensional nanoscale building blocks due to their fascinating properties,cost-effective production,and good *** the intrinsic self-assembling,colloidal,and rheological features of graphene derivatives is of critical importance to establish the formation-structure-property relationship of graphene-based *** article reviews recent progresses in our studies of these interesting properties of graphene derivatives for developing high performance *** content is organized to include characteristics of the dispersions of graphene derivatives,self-assembly of nanosheets from liquid medium,colloidal behavior,rheological properties of the dispersions,processing methods based on the properties,and performance of the fabricated *** and RGO nanosheets are proved to form different types of assembled structures with unique morphologies,such as ultrathin layer-by-layer films,porous aggregates,and *** unique rheological properties of GO dispersions and hydrogels,feasible for both the traditional wet-processing and newly-developed technology like three-dimensional printing,are highlighted for their potential in structural manipulation and scalable fabrication of graphene-based *** research devoted to up-grading the performance of supercapacitors is presented in some details,which could be applicable for fabricating other graphene-based energy storage *** challenges and perspectives in our point of view are given in the last part of this feature article.

关键词： Graphene derivatives Self-assembly Colloids Rheology Processing Supercapacitor

NUMERICAL SIMULATION OF GAS TURBULENCE ENHANCEMENT BY PARTICLE-WAKE EFFECT

在线全文

学校读者我要写书评

暂无评论

Journal of Hydrodynamics 2007年第2期19卷 155-159页

作者： ZENG Zhuo-zhi ZENG Zhuo-xiong nan Ying HAN Shou-lei Aeronautic and Mechanical Engineering college Nanchang University of Aeronautics Nanchang 330063 China

A new turbulence enhancement model was incorporated into the second-order moment two-phase turbulence model and was used to simulate gas-particle flows in swirling chambers and channels with different wall roughness. The results show that compared with the turbulence modification model not accounting for the wake effect, this model, together with the conventional particle source term, gives simulation results in better agreement with the experimental data.

关键词： gas-particle flows turbulencemodification numerical simulation

Calculation of groundwater head distribution with a close barrier during excavation dewatering in confined aquifer

在线全文

学校读者我要写书评

暂无评论

Geoscience Frontiers 2021年第2期12卷 791-803页

作者： Hai-Min Lyu Shui-Long Shen Yong-xia Wu An-nan Zhou MOE Key Laboratory of Intelligent Manufacturing Technology Department of Civil and Environmental EngineeringCollege of EngineeringShantou UniversityGuangdongChina State Key Laboratory of Internet of Things for Smart City University of MacaoMacaoChina College of Mechanical and Automotive Engineering Shanghai University of Engineering ScienceShanghai201620China Civil and Infrastructure Discipline School of EngineeringRoyal Melbourne Institute of Technology(RMIT)MelbourneVic3001Australia

When pumping is conducted in confined aquifer inside excavation pit(waterproof curtain),the direction of the groundwater seepage outside the excavation changes from horizontal to vertical owing to the existence of the curtain *** is no analytical calculation method for the groundwater head distribution induced by dewatering inside *** paper first analyses the mechanism of the blocking effects from a close barrier in confined ***,a simple equation based on analytical solution is proposed to calculate groundwater heads inside and outside of the excavation pit with waterproof curtain(hereafter refer to close barrier)in a confined *** distribution of groundwater head is derived according to two conditions:(i)pumping with a constant water head,and(ii)pumping with a constant flow *** proposed calculation equation is verified by both numerical simulation and experimental *** comparisons demonstrate that the proposed model can be applied in engineering practice of excavation.

关键词： Confined aquifer Waterproof curtain Dewatering Groundwater head

Relationship between parenting stress and behavioral and emotional problems in preschool children: A mediation effect analysis

在线全文

学校读者我要写书评

暂无评论

World Journal of Psychiatry 2025年第1期15卷 128-136页

作者： zhi-Wei Fu Yue-Jing Li Ran Yu Rui-Qing Guo Li-xia Gao Sheng-xia Zhao Department of Children's Health Shijiazhuang Maternity and Child Healthcare HospitalShijiazhuang 050000Hebei ProvinceChina

BACKGROUND Emotional reactions,such as anxiety,irritability,and aggressive behavior,have attracted clinical attention as behavioral and emotional problems in preschool-age *** To investigate the current status of family rearing,parental stress,and behavioral and emotional problems of preschool children and to analyze the mediating effect of the current status of family rearing on parental stress and behavioral/emo-tional *** We use convenience sampling to select 258 preschool children in the physical examination center of our hospital from October 2021 to September *** children and their parents were evaluated using a questionnaire ***'s correlation was used to analyze the correlation between child behavioral and emotional problems and parental stress and family rearing,and the structural equation model was constructed to test the mediating *** The score for behavioral/emotional problems of 258 preschool children was(27.54±3.63),the score for parental stress was(87.64±11.34),and the score for parental family rearing was(31.54±5.24).There was a positive correlation between the behavioral and emotional problems of the children and the“hostile/mandatory”parenting style;meanwhile,showed a negative correlation with the“support/participation”parenting style(all P<0.05).The intermediary effect value between the family upbringing of parents in parental stress and children's behavior problems was 29.89%.CONCLUSION Parental family upbringing has a mediating effect between parental stress and behavioral and emotional problems of *** paying attention to the behavioral and emotional problems of preschool-age children,clinical medical staff should provide correct and reasonable parenting advice to their parents to promote the mental health of preschool-age children.

关键词： Preschool children Parenting stress Children's behavioral and emotional problems Family rearing Mediating effect

Incidence,characteristics and risk factors for alveolar recruitment maneuver-related hypotension in patients undergoing laparoscopic colorectal cancer resection

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Gastrointestinal Surgery 2023年第7期15卷 1454-1464页

作者： nan-Rong Zhang zhi-nan Zheng Kai Wang Hong Li Department of Anesthesia The Sixth Affiliated HospitalSun Yat-sen UniversityGuangzhou 510655Guangdong ProvinceChina Guangdong Provincial Key Laboratory of Colorectal and Pelvic Floor Diseases The Sixth Affiliated HospitalSun Yat-sen UniversityGuangzhou 510655Guangdong ProvinceChina

BACKGROUND Alveolar recruitment maneuvers(ARMs)may lead to transient hypotension,but the clinical characteristics of this induced hypotension are poorly *** investigated the characteristics of ARM-related hypotension in patients who underwent laparoscopic colorectal cancer *** To investigate the characteristics of ARM-related hypotension in patients who underwent laparoscopic colorectal cancer *** This was a secondary analysis of the PROtective Ventilation using Open Lung approach Or Not trial and included 140 *** ARM was repeated every 30 min during intraoperative mechanical *** primary endpoint was ARM-related hypotension,defined as a mean arterial pressure(MAP)<60 mmHg during an ARM or within 5 min after an *** risk factors for hypotension were *** peri-ARM changes in blood pressure were analyzed for the first three ARMs(ARM_(1,2,3))and the last ARM(ARMl_(ast)).RESULTS Thirty-four subjects(24.3%)developed ARM-related *** all 1027 ARMs,37(3.61%)induced *** ARMs under nonpneumoperitoneum(33/349,9.46%)than under pneumoperitoneum conditions(4/678,0.59%)induced hypotension(P<0.01).The incidence of hypotension was higher at ARM_(1)points than at non-ARM_(1)points(18/135,13.3%vs 19/892,2.1%;P<0.01).The median percentage decrease in the MAP at ARM1 was 14%.Age≥74 years,blood loss≥150 mL and peak inspiratory pressure under pneumoperitoneum<24 cm H_(2)O were risk factors for ARM-related *** When the ARM was repeated intraoperatively,a quarter of subjects developed ARM-related hypotension,but only 3.61%of ARMs induced ***-related hypotension most occurred in a hemodynamically unstable state or a hypovolemic state,and in elderly ***,ARMs that were performed under pneumoperitoneum conditions had less impact on blood pressure.

关键词： Alveolar recruitment maneuvers Hypotension Laparoscopic colorectal cancer resection

FEM analysis of metal flowing behaviors in porthole die extrusion based on the mesh reconstruction technology of the welding process

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2010年第6期17卷 763-769页

作者： Dong-nan Huang zhi-hao Zhang Jing-yuan Li Jian-xin Xie Advanced Materials and Technologies Institute University of Science and Technology Beijing Beijing 100083 China School of Materials Science and Engineering Inner Mongolia University of Technology Huhhot 010051 China

A reconstruction technology of finite element meshes based on reversal engineering was applied to solve mesh penetration and separation in the finite element simulation for the divergent extrusion. The 3D numerical simulation of the divergent extrusion process in- cluding the welding stage for complicated hollow sections was conducted. Based on the analysis of flowing behaviors, the flowing velocities of the alloy in portholes and near the welding planes were properly controlled through optimizing the expansion angle as well as porthole ar- eas and positions. After the die structure optimization, defects such as warp, wrist, and the wavelike are eliminated, which improves the sec- tion-forming quality. Meanwhile, the temperature distribution in the cross section is uniform. Especially, the temperature of the C-shape notch with a larger thickness is lower than that of other regions in the cross section, which is beneficial for balancing the alloy flowing velocity.

关键词： numerical simulation extrusion metal forming metal flow reconstruction

Puerarin ameliorates allodynia and hyperalgesia in rats with peripheral nerve injury

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2018年第7期13卷 1263-1268页

作者： Heng-Tao Xie Zhong-Yuan xia xia Pan Bo Zhao zhi-Gang Liu Department of Anesthesiology Renmin Hospital of Wuhan University

Puerarin is a major active ingredient of the traditional Chinese plant medicine,Radix Puerariae,and commonly used in the treatment of myocardial and cerebral ***,the effects of puerarin on neuropathic pain are still *** this study,a neuropathic pain animal model was created by partial sciatic nerve ***（30 or 60 mg/kg） was intraperitoneally injected once a day for 7 *** allodynia and thermal hyperalgesia were examined at 1 day after model *** threshold and paw withdrawal latency markedly increased in a dose-dependent manner in puerarin-treated rats,especially at 7 days after model *** 7 days after model establishment,quantitative real-time reverse transcriptase-polymerase chain reaction results showed that puerarin administration reversed m RNA expression of transient receptor potential vanilloid 1（Trpv1） and transient receptor potential ankyrin 1（Trpa1） in a dose-dependent manner in dorsal root ganglion neurons after peripheral nerve *** results suggest that puerarin dose-dependently ameliorates neuropathic pain by suppressing Trpv1 and Trpa1 up-regulation in dorsal root ganglion of neuropathic pain rats.

关键词： nerve regeneration puerarin Radix Puerariae traditional Chinese medicine Trpv1 Trpa1 dorsal root ganglion peripheral nerve injury neuropathic pain mechanical allodynia thermal hyperalgesia neural regeneration