检索结果-南通市图书馆

维普期刊数据库博看期刊

在线全文

学校读者我要写书评

暂无评论

轻质碳酸镁纤维的制备

辽宁化工 2024年第3期53卷 365-369页

作者：段思雨袁碧隆赵飒曹大力沈阳化工大学材料科学与工程学院辽宁沈阳110142

以MgSO_(4)·7H_(2)O和K_(2)CO_(3)为原料、PEG为结构导向剂,采用共沉淀法合成出轻质碳酸镁纤维,其废液为K_(2)SO_(4)/K_(2)Mg(SO_(4))_(2)溶液。通过XRD、SEM和TG-DTA对样品进行表征,探究了影响轻质碳酸镁组成和形貌的因素及活性碳酸... 详细信息

以MgSO_(4)·7H_(2)O和K_(2)CO_(3)为原料、PEG为结构导向剂,采用共沉淀法合成出轻质碳酸镁纤维,其废液为K_(2)SO_(4)/K_(2)Mg(SO_(4))_(2)溶液。通过XRD、SEM和TG-DTA对样品进行表征,探究了影响轻质碳酸镁组成和形貌的因素及活性碳酸镁纤维形成机理。结果表明:在室温,搅拌速率为300 rad·min^(-1)、Mg SO_(4)浓度为1.0 mol·l^(-1)、Mg SO_(4)与K_(2)CO_(3)摩尔比为1∶1.1、PEG添加量为MgSO_(4)·7H_(2)O质量的30%的条件下,可制备分散性良好、晶须平均长度约为15.89μm、直径0.97μm、长径比为16.38的轻质碳酸镁纤维。

关键词： MgSO_(4)·7H_(2)O K_(2)CO_(3) 共沉淀法轻质碳酸镁纤维

影像三维重建安全辅助单孔分体内镜治疗l_(5)/S_(1)极外侧腰椎间盘突出症

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

中国组织工程研究 2025年第9期29卷 1876-1882页

作者：冯志萌孙宁孙兆忠李岳飞刘昌震李洒滨州医学院附属医院脊柱外科山东省滨州市256603

背景:单孔分体内镜作为一种新型的内镜技术,适用于治疗极外侧腰椎间盘突出症。但目前国内外针对l_(5)/S_(1)这一发病率极低的极外侧腰椎间盘突出症的研究资料甚少,尚无详尽描述单孔分体内镜治疗l_(5)/S_(1)极外侧腰椎间盘突出症的影像... 详细信息

背景:单孔分体内镜作为一种新型的内镜技术,适用于治疗极外侧腰椎间盘突出症。但目前国内外针对l_(5)/S_(1)这一发病率极低的极外侧腰椎间盘突出症的研究资料甚少,尚无详尽描述单孔分体内镜治疗l_(5)/S_(1)极外侧腰椎间盘突出症的影像解剖学资料。目的:通过影像三维重建确定骨性标志点,并以该标志点准确定位l_(5)出口神经根、l_(5)/S_(1)椎间隙及其他结构之间的位置关系,辅助单孔分体内镜经后外侧入路实现对l_(5)出口神经根的减压,治疗l_(5)/S_(1)极外侧腰椎间盘突出症。方法:选择符合纳入标准的29例l_(5)/S_(1)单侧极外侧腰椎间盘突出症患者,其中男12例,女17例;年龄48-74岁。将患者的腰椎CT数据资料导入Mimics 21.0软件中重建腰椎三维模型。测量l_(5)/S_(1)相关参数:①在横突根部下缘与峡部外侧缘的交点(H)所在矢状面上测量:H分别至l_(5)出口神经根上缘、下缘的垂直距离(a1,a2);H分别至l_(5)下终板、S1上终板的垂直距离(b1,b2);H至l_(5)椎弓根下缘的垂直距离(c);②H至l_(5)椎弓根内侧壁所在矢状面的左右水平距离(d);③H至硬脊膜外侧缘所在矢状面的左右水平距离(e);④H至l_(5)下终板最外侧缘所在矢状面的左右水平距离(f);⑤在l_(5)下终板最外侧缘所在矢状面上测量:H所在横断面分别至l_(5)出口神经根上缘、下缘的垂直距离(g1,g2);H所在横断面分别至l_(5)下终板、S1上终板的垂直距离(h1,h2);⑥H至l_(5)出口神经根最后缘所在冠状面的前后水平距离(i);⑦骶骨翼后缘最高点至l_(5)下终板最后缘所在冠状面的前后水平距离(j)。结果与结论:①男女之间各相关测量参数相比差异无显著性意义(P>0.05);②a1,a2,b1,b2,c,d,e,f,h1,h2,g1,g2,i,j患侧与健侧相比差异无显著性意义(P>0.05);③观测发现,a1与c之间相比差异无显著性意义(P>0.05),表明椎弓根下缘即为l_(5)出口神经根上缘,l_(5)出口神经根紧贴椎弓根下缘并经l_(5)椎体后方向前外侧走行,H均位于l_(5)出口神经根上方;④以H作为骨性标志点,无需向上探查,无需磨除峡部,只需向下、向外侧磨除部分骨质显露l_(5)出口神经根与椎间隙,向内侧有足够的安全距离避免损伤硬脊膜来完成侧隐窝、椎间孔区域的探查减压;⑤术者可在H、l_(5)下终板最外侧缘所在的矢状面及l_(5)横突与骶骨翼构成的“矩形区域”内进行操作,越靠近内下方区域(Kambin三角)越安全;⑥提示单孔分体内镜经后外侧入路治疗l_(5)/S_(1)极外侧腰椎间盘突出症,在镜下以H作为骨性标志点定位l_(5)出口神经根及椎间隙,能实现对l_(5)出口神经根的精准、安全、有效减压。

关键词：极外侧腰椎间盘突出症单孔分体内镜影像三维重建骨性标志数字化软件

Genetic differentiation in functional traits among wild cherry (Prunus avium l.) half-sib lines

在线全文

学校读者我要写书评

暂无评论

Journal of Forestry Research 2022年第3期33卷 991-1003页

作者： Srđan Stojnić Branislav Kovačević Marko Kebert Verica Vasić Vanja Vuksanović Branislav Trudić saša Orlović Institute of lowland Forestry and Environment University of Novi SadAntonaČehova 13dNovi Sad21000Serbia Faculty of Agriculture University of Novi SadTrg Dositeja Obradovića 8Novi Sad21000Serbia Food and Agriculture Organization of the United Nations Viale delle Terme di Caracalla00153RomeItaly

Understanding intra-specific variation in leaf functional traits is one of the key requirements for the evaluation of species adaptive capacity to ongoing climate change, as well as for designing long-term breeding and conservation strategies. Hence, data of 19 functional traits describing plant physiology, antioxidant properties, anatomy and morphology were determined on 1-year-old seedlings of wild cherry (Prunus avium l.) half-sib lines. The variability within and among half-sib lines, as well as the estimation of multi-trait association, were examined using analysis of variance (ANOVA) followed by Tukey's honestly significant difference test and multivariate analyses: principal component analysis (PCA), canonical discriminant analysis (CDA) and stepwise discriminant analysis (SDA). Pearson’s correlation coefficient was used to evaluate linear correlation between the study parameters. The results of the ANOVA showed the presence of statistically significant differences (P lf-sib lines for all study traits. The differences within half-sib lines, observed through the contribution of the examined sources of variation to the total variance (%), had higher impact on total variation in the majority of the examined traits. Pearson’s correlation analysis and PCA showed strong relationships between gas exchange in plants and leaf size and stomatal density, as well as between leaf biomass accumulation, intercellular CO_(2) concentration and parameters related to antioxidant capacity of plants. likewise, the results of SDA indicate that transpiration and stomatal conductance contributed to the largest extent, to the discrimination of the wild cherry half-sib lines. In addition, PCA and CDA showed separation of the wild cherry half-sib lines along the first principal component and first canonical variable with regards to humidity of their original sites. Multiple adaptive differences between the wild cherry half-sib lines indicate high potential of the specie

关键词： Wild cherry Common garden experiment Variability Multivariate statistics leaf functional traits

HYPERSINGUlAR INTEGRAl EQUATIONS FOR PERIODIC ARRAYS OF PlANAR CRACKS IN A PERIODICAllY-lAYERED ANISOTROPIC ElASTIC SPACE UNDER ANTIPlANE SHEAR STRESS

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Scientia 1999年第3期19卷 343-355页

作者： W.T.Ang (Faculty of Engineering, Universiti Malaysia sarawak, 94300 Kota samarahan, Malaysia)D.l. Clements(Department of Applied Mathematics, University of Adelaide, sa5005, Australia) Faculty of Engineering Universiti Malaysia Sarawak 94300 Kota Samarahan Malaysia Department of Applied Mathematics University of Adelaide SA5005 Australia

Hypersingular integral equations are derived for the problem of determining the antiplane shear stress around periodic arrays of planar cracks in a periodically-layered anisotropic elastic space. The unknown functions are directly related to the jump in the displacements across opposite crack faces. Once the integral equations are solved, crack parameters of interest, such as the clack tip stress intensity factors, may be readily *** some specific examples of the problem, the integral equations are solved numerically by using a collocation technique, in order to compute the relevant stress intensity factors.

关键词： Periodically-located cracks periodically-layered anisotropic material antiplane shear stress hypersingulal integral equations

S-adenosyl-methionine decreases ethanol-induced apoptosis in primary hepatocyte cultures by a c-Jun N-terminal kinase activity-independent mechanism

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2006年第12期12卷 1895-1904页

作者： Maria del Pilar Cabrales-Romero lucrecia Márquez-Rosado samia FatteI-Fazenda Cristina Trejo-Solis Evelia Arce-Popoca leticia Alemán-lazarini saúl Villa-Trevineo Department of Cell Biology Centro de Investigacién y Estudios Avanzados IPN Av. IPN No. 2508 México DF México Department of Neuroimmunology Instituto National de Neurologia y Neurocirugia MVS Insurgentes Sur 3877 Col La Fama DF México

AIM： To determine the role of c-Jun N-terminal kinase （JNK） activity in ethanol-induced apoptosis and the modulation of this signaling cascade by S-Adenosylmethionine （AdoMet）. METHODS： Primary hepatocyte cultures were pretreated with 100 IJmol/l SP600125, a selective JNK inhibitor, 1 ml/l DMSO or 4 mmol/l AdoMet and then exposed to 100 mmo/l ethanol. Hepatocyte apoptosis was determined by the TUNEl and DNA ladder assays. JNK activity and its inhibition by SP600125 and AdoMet were determined by Western blot analysis of c-jun phosphorylation and Bid fragmentation. SP600125 and AdoMet effects on the apoptotic signaling pathway were determined by Western blot analysis of cytochrome c release and pro-caspase 3 fragmentation. The AdoMet effect on glutathione levels was measured by EIIman＇s method and reactive oxygen species （ROS） generation by cell cytometry. RESUlTS： The exposure of hepatocytes to ethanol induced JNK activation, c-jun phosphorylation, Bid fragmentation, cytochrome c release and pro-caspase 3 cleavage; these effects were diminished by SP600125, and caused a significant decrease in ethanol-induced apoptosis （P〈 0.05）. AdoMet exerted an antioxidant effect maintaining glutathione levels and decreasing ROS generation, without a significant effect on JNK activity, and prevented cytochrome c release and pro-caspase 3 cleavage.CONClUSION： The JNK signaling cascade is a key component of the proapoptotic signaling pathway induced by ethanol. JNK activation may be independent from ROS generation, since AdoMet which exerted antioxidant properties did not have a significant effect on JNK activity. JNK pathway modulator agents and AdoMet may be components of promising therapies for alcoholic liver disease （AlD） treatment.

关键词： Alcoholic liver disease c-Jun N-terminal kinase Apoptosis SP600125 S-Adenosyl methionine Bid Reactive oxygen species

leveraging 3D blendshape for facial expression recognition using CNN

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

Science China(Information Sciences) 2020年第2期63卷 101-103页

作者： sa WANG Zhengxin CHENG Xiaoming DENG liang CHANG Fuqing DUAN Ke lU College of Artificial Intelligence Beijing Normal University Bejing Key laboratory of Human-Computer Interactions Institute of Software Chinese Academy of Sciences School of Computer and Control Engineering University of Chinese Academy of Sciences

Dear editor,Recently, facial expression recognition (FER) has drawn increasing attention owing to its widespread application in many fields such as human-machine interaction, assistive healthcare, psychology, and onli... 详细信息

关键词： image leveraging 3D blendshape for facial expression recognition using CNN

Nucleon Finite Volume Effect and Nuclear Matter Properties in a Relativistic Mean-Field Theory

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2006年第6X期46卷 1052-1058页

作者： R. Costa A.J. santiago H. Rodrigues J. sa Borges Instituto de Fisica Universidade do Estado do Rio de Janeiro Rio de Janeiro-RJ 20559-900 Brazil Centro Federal de Educ~ao Tecnológica Rio de Janeiro Brazil

Effects of excluded volume of nucleons on nuclear matter are studied, and the nuclear properties that follow from different relativistic mean-field model parametrizations are compared. We show that, for all tested parametrizations, the resulting volume energy al and the symmetry energy J are around the acceptable values of 16 MeV and 30 MeV, and the density symmetry l is around 100 MeV. On the other hand, models that consider only linear terms lead to incompressibility Ko much higher than expected. For most parameter sets there exists a critical point （pc, δc）, where the minimum and the maximum of the equation of state are coincident and the incompressibility equals zero. This critical point depends on the excluded volume parameter r. If this parameter is larger than 0.5 fm, there is no critical point and the pure neutron matter is predicted to be bound. The maximum value for neutron star mass is 1.85M⊙, which is in agreement with the mass of the heaviest observed neutron star 4U0900-40 and corresponds to r = 0.72 fm. We also show that the light neutron star mass （1.2M⊙） is obtained for r ≌ 0.9 fro.

关键词： nuclear matter relativistic models nuclear matter aspects of neutron stars

A single dose of caffeic acid phenethyl ester prevents initiation in a medium-term rat hepatocarcinogenesis model

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2006年第42期12卷 6779-6785页

作者： Claudia Esther Carrasco-legleu Yesennia Sánchez-Pérez lucrecia Márquez-Rosado samia Fattel-Fazenda Evelia Arce-Popoca Sergio Hernández-García saúl Villa-Trevio Departamento de Biología Celular Centro de Investigación y de Estudios Avanzados del IPN (Cinvestav). Ave. IPN #2508. Col. San Pedro Zacatenco C.P. 07360 México D.F. México Instituto Nacional de Cancerología San Fernando No. 22 C.P.14080 México D.F. México

AIM： To study of the effect of caffeic acid phenethyl ester （CAPE） on the initiation period in a medium-term assay of hepatocarcinogenesis. METHODS： Male Wistar rats were subjected to a carcinogenic treatment （CT） and sacrificed at 25^th d; altered hepatic foci （AHF） were generated efficiently. To a second group of rats a single 20 mg/kg doses of CAPE was given 12 h before initiation with CT and were sacrificed at 25^th d. We evaluated the expression of preneoplastic markers as Y-glutamyltranspeptidase （GGT） and glutathione S-transferase type pi protein （GSTp） by histochemistry, RT-PCR and Western blot analyses, respectively. We measured thiobarbituric acid reactive substances （TBARS） in homogenates of liver and used Unscheduled DNA Synthesis （UDS） assay by incorporation of [^3H] thymidine （^3HdT） in primary hepatocyte cultures （PHC）. RESUlTS： At 25^th d after CT CAPE reduced the observed increase of GGT^＋AHF by 84% and liver expression ofggt mRNA by 100%. In case of the GSTp protein, the level was reduced by 90%. As indicative of oxidative stress generated by diethylnitrosamine （DEN） 12 h after its administration, we detected a 68% increase of TBARS. When CAPE was administered before DEN, it completely protected from liver TBARS induction. To have an indication of the sole effect of CAPE on initiation, two carcinogens were tested in a UDS assay in PHC, we used methyl-n-nitrosoguanidine as a direct carcinogen and DEN, as indirect carcinogen. In this assay, genotoxic damage caused by carcinogens was abolished at 5μM CAPE concentration. CONClUSION： Our results demonstrated that CAPE possesses anti-genotoxic and antineoplastic capabilities, by an anti-oxidative and free-radical scavenging mechanism.

关键词： Caffeic acid phenethyl ester Antioxidant Hepatocarcinogenesis Initiation

Ulnar variance related to biological and training characteristics, pain and handgrip strength in Portuguese skeletally immature male gymnasts

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

Journal of Sport and Health Science 2015年第2期4卷 174-181页

作者： luísa Amaral Albrecht l.Claessens Jos Ferreirinha Paulo santos Health Sciences School University of Fernando Pessoa Department of Biomedical Kinesiology Faculty of Kinesiology and Rehabilitation Sciences Katholieke Universiteit Leuven Research Centre for Sport Health and Human Development (CIDESD) University of Tra's-os-Montes and Alto Douro Centre of Research Education Innovation and Intervention in Sport (CIFI2D) Faculty of Sport University of Porto

Purpose： This study was to investigate the association between ulnar variance（UV） and biological and training characteristics, handgrip, and wrist pain in a group of 23 Portuguese skeletally immature male gymnasts（aged 11.2 2.5 years）.Methods： left and right UV was obtained using Hafner＇s procedure and skeletal age was determined by the TannereWhitehouse 3-method. A negative mean value for UV measures was observed（ 2.4 to 3.6 mm） without significant differences with increasing age-category（ p=0.09 to p=0.48）. Significant low correlations were observed between some UV parameters and stature, fat percentage, years of training, and left handgrip ***： Ten gymnasts reported wrist pain with gradual onset and UV values were very similar between painless and painful ***： The findings of this study do not directly support the thesis that gymnastics training and biological variables or wrist pain are associated with UV.

关键词： Gymnasts Pain Training Ulnar variance