检索结果-南通市图书馆

Association between body mass index and in vitro fertilization/intra-cytoplasmic sperm injection outcomes:An analysis of 15,124 normal ovarian responders in China

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese Medical Journal 2024年第7期137卷 837-845页

作者： Danlei Zheng Yuanyuan Wang Lixue Chen lin Zeng Rong Li Department of Obstetrics and Gynecology Center for Reproductive MedicinePeking University Third HospitalBeijing 100191China Research Center of Clinical Epidemiology Peking University Third HospitalBeijing 100191China

Background:High body mass index(BMI)results in decreased fecundity,and women with high BMI have reduced rates of clinical pregnancy and live birth in in vitro fertilization/intra-cytoplasmic sperm injection(IVF/ICSI).Meanwhile,ovarian responses show great heterogeneity in patients with a high *** study aimed to analyze the effects of a high BMI on IVF/ICSI outcomes in the Chinese female with normal ovarian ***:We performed a retrospective cohort study comprising 15,124 patients from the medical record system of the Reproductive Center of Peking University Third Hospital,with 3530(23.3%)in the overweight group and 1380(9.1%)in the obese group,who had a normal ovarian response(5-15 oocytes retrieved)and underwent fresh embryo transfer(ET)cycles from January 2017 to December 2018,followed by linked frozen-thawed embryo transfer(FET)cycles from January 2017 to December *** live birth rate(CLBR)was used as the primary ***,a generalized additive model was applied to visually illustrate the curvilinear relationship between BMI and the *** used a decision tree to identify the specific population where high BMI had the greatest effect on IVF/ICSI ***:High BMI was associated with poor IVF/ICSI outcomes,both in cumulative cycles and in separate fresh ET or FET *** cumulative cycles,compared with the normal weight group,obesity was correlated with a lower positive pregnancy test rate(adjusted odds ratio[aOR]:0.809,95%confidence interval[CI]:0.682-0.960),lower clinical pregnancy rate(aOR:0.766,95%CI:0.646-0.907),lower live birth rate(aOR:0.706,95%CI:0.595-0.838),higher cesarean section rate(aOR:2.066,95%CI:1.533-2.785),and higher rate of large for gestational age(aOR:2.273,95%CI:1.547-3.341).In the generalized additive model,we found that CLBR declined with increasing BMI,with 24 kg/m^(2)as an inflection *** the decision tree,BMI only made a difference in the population aged≤34.5 years,with anti-Muller

关键词： Obesity Body mass index fertilization Live birth Decision trees Normal ovarian response

在线全文

学校读者我要写书评

暂无评论

数学学科核心素养导向下的教育数学实证研究

数学教育学报 2024年第1期33卷 21-27页

作者：谭琳张永胜陈如仙徐章韬饶永生广州大学计算科技研究院广东广州510006 广州城市职业学院信息工程学院广东广州510405 邛崃市教研培训中心四川成都611530 华中师范大学数学与统计学学院湖北武汉430070

教育数学实验是中国教育改革的重要组成部分,学生的数学学科核心素养发展状况是其改革实验效果的重要衡量指标之一.研究选取初中数学核心素养评价框架,对邛崃市教育数学实验进行评价研究,分析该实验对学生数学核心素养发展的影响.基于... 详细信息

教育数学实验是中国教育改革的重要组成部分,学生的数学学科核心素养发展状况是其改革实验效果的重要衡量指标之一.研究选取初中数学核心素养评价框架,对邛崃市教育数学实验进行评价研究,分析该实验对学生数学核心素养发展的影响.基于所选框架对该市2017级初三第二次诊断试卷考查的数学核心素养进行分类.根据学生核心素养的得分,对比分析该市3672名初三学生与93名教育数学实验班学生数学核心素养的发展状况.研究发现:该市初三学生的整体数学核心素养发展不平衡,特别是在数学建模、逻辑推理素养上不合格比例较高;教育数学体系下的实验组核心素养发展情况普遍优于该市整体水平,且其发展更为均衡.结论说明教育数学可促进学生数学核心素养的普遍均衡发展,实验风险可控,适合大规模普及.

关键词：数学学科核心素养教育数学教学改革评价研究

A Self-growing Porous Calcium-based Adsorbent Derived from Biowaste for Efficient Wastewater Purification

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Structural Chemistry 2021年第10期40卷 1328-1336页

作者： lin Liang ZHUANG Zan-yong Fujian Chuanzheng Communications College Fuzhou 350007China College of Materials Science and Engineering Fuzhou UniversityFuzhou 350108China Key Laboratory of Advanced Materials Technologies(Fuzhou University) Fujian Province UniversityFuzhou 350108China

Traditional adsorbents are normally suffered from a low adsorption capacity that has a finite saturated adsorption capacity. We reported herein a hierarchical self-growing porous calcium silicate hydrate(CSH) that uses biowaste as the precursor and is highly efficient in wastewater purification. In the process of phosphorus removal, CSH can react with phosphorus in water and grow into the hydroxyapatite(HAP). The generation of HAP further increases the active sites while maintains the porous structure of pristine CSH. Subsequently, the HAP could conduct the efficient extraction of Pb^(2+) from wastewater based on the ion exchange between Ca^(2+) and Pb^(2+). Clearly, the CSH structure has self-growing structure using the pollutants as the building blocks, not only achieving high adsorption capacity for pollutants, but also maintaining the hierarchically porous structure that supports the high efficiency in the next cycling. We provide here an intriguing pathway to tackle bottleneck of the traditional adsorbents, i.e., a finite saturated adsorption capacity.

关键词： self-growing model high adsorption capacity biowaste porous materials wastewater purifications

微通道中一类生物流体在高Zeta势下的电渗流及传热特性

在线全文

学校读者我要写书评

暂无评论

物理学报 2024年第6期73卷 229-240页

作者：慕江勇崔继峰陈小刚赵毅康田祎琳于欣如袁满玉内蒙古工业大学理学院呼和浩特010051

在高壁面Zeta势下,研究滑移边界条件下满足牛顿流体模型的一类生物流体的电渗流动及传热特性,流体在外加电场、磁场和焦耳加热共同作用下流动.首先,在不使用Debye-Hückel线性近似条件时,利用切比雪夫谱方法给出非线性Poisson-Boltzman... 详细信息

在高壁面Zeta势下,研究滑移边界条件下满足牛顿流体模型的一类生物流体的电渗流动及传热特性,流体在外加电场、磁场和焦耳加热共同作用下流动.首先,在不使用Debye-Hückel线性近似条件时,利用切比雪夫谱方法给出非线性Poisson-Boltzmann方程和流函数满足的四阶微分方程及热能方程的数值解,将所得结果与利用Debye-Hückel线性近似所得结果进行比较,证明本文数值方法的有效性.其次,讨论电磁环境下壁面Zeta势、哈特曼数H、电渗参数m、滑移参数β对流动特性、泵送特性和捕获现象的影响,并探究焦耳加热参数γ和布林克曼数Br等参数对传热特性的影响.结果表明,壁面Zeta势、电渗参数m、滑移参数β的增大对流体速度有促进作用,而哈特曼数H的增大会抵抗流体流动.研究进一步表明,焦耳加热参数γ和布林克曼数Br的增大会导致温度升高.

关键词：电渗流传热特性高Zeta势切比雪夫谱方法

Efficient and pH-Sensitive Nonconventional Luminescent Polymers for Cellular Imaging and Ion Detection

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2024年第11期 1679-1689页

作者： Jiao He Hua-Jian Song Zuo-An Liu Bing-Li Jiang yong-Yang Gong Wang-Zhang Yuan Guangxi Key Laboratory of Optical and Electronic Materials and Devices College of Materials Science and Engineering Guilin University of Technology College of Pharmacy Guilin Medical University School of Chemistry and Chemical Engineering Shanghai Jiao Tong University

Nonconventional luminescent materials （NLMs） are a type of organic luminescent materials that does not contain aromatic *** to the simplicity of the synthesis process,mild reaction conditions,good hydrophilicity and biological compatibility,NLMs have attracted much ***,numerous reports indicate that NLMs can only effectively luminesce at high concentrations and in solid state,which limits their applicability in the field of cell *** study addresses this limitation by designing and synthesizing oligomers P1,P2 and P3 using ethylene glycol diglycidyl ether and amine compounds containing ethylene *** oligomers exhibit remarkable luminescence efficiency reaching as high as 9.2%in dilute solutions （0.1 mg/m L）,making them among the best NLMs in this ***,the synthesized oligomers exhibit excitation wavelength-dependent and concentration-dependent luminescence intensity,fluorescence response to temperature and p H changes,as well as the ability to identify Fe3+,Cu2+and Mo5+in dilute *** characteristics render them potentially useful in the for cell imaging.

关键词：

Effective interactions between two impurities in quasi-two-dimensional dipolar Bose–Einstein condensates

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 2020年第7期72卷 65-70页

作者： Fu-lin deng Tao Shi Su Yi CAS Key Laboratory of Theoretical Physics Institute of Theoretical PhysicsChinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China CAS Center for Excellence in Topological Quantum Computation University of Chinese Academy of SciencesBeijing 100049China

We investigate the effective interaction between two heavy impurities immersed in a quasi-twodimensional dipolar Bose-Einstein condensate via a variation *** show that the mediated interaction is highly tunable via the contact and the dipole-dipole interactions between the background gas ***,the mediated interaction potential may become an oscillating function of inter-impurity distance when roton excitation emerges under sufficiently strong dipolar *** system therefore provides an efficient way for tuning the mediated interaction between impurities.

关键词： dipolar gas impurity effective interaction roton excitation

Faster structured illumination microscopy using complementary encoding-based compressive imaging

在线全文

学校读者我要写书评

暂无评论

Photonics Research 2024年第4期12卷 740-748页

作者： ZHENGQI HUANG YUNHUA YAO YIlin HE YU HE CHENGZHI JIN MENGDI GUO DALONG QI LIANZHONG deng ZHENRONG SUN ZHIyong WANG SHIAN ZHANG State Key Laboratory of Precision Spectroscopy School of Physics and Electronic ScienceEast China Normal UniversityShanghai 200241China School of Mathematical Sciences University of Electronic Science and Technology of ChinaChengdu 611731China Joint Research Center of Light Manipulation Science and Photonic Integrated Chip of East China Normal University and Shandong Normal University East China Normal UniversityShanghai 200241China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006China

Structured illumination microscopy (SIM) has been widely applied to investigate intricate biological dynamics due to its outstanding super-resolution imaging speed. Incorporating compressive sensing into SIM brings the possibility to further improve the super-resolution imaging speed. Nevertheless, the recovery of the superresolution information from the compressed measurement remains challenging in experiments. Here, we report structured illumination microscopy with complementary encoding-based compressive imaging (CECI-SIM) to realize faster super-resolution imaging. Compared to the nine measurements to obtain a super-resolution image in a conventional SIM, CECI-SIM can achieve a super-resolution image by three measurements;therefore, a threefold improvement in the imaging speed can be achieved. This faster imaging ability in CECI-SIM is experimentally verified by observing tubulin and actin in mouse embryonic fibroblast cells. This work provides a feasible solution for high-speed super-resolution imaging, which would bring significant applications in biomedical research.

关键词： illumination complementary faster

农业经济发展与生态环境系统的耦合协调关系——基于湖南省绿色低碳发展的实证

在线全文

学校读者我要写书评

暂无评论

吉首大学学报（社会科学版） 2024年第4期45卷 126-136页

作者：曾福生邓颖蕾湖南农业大学经济学院湖南长沙410128 湖南女子学院商学院湖南长沙410004

基于探究农业经济发展与生态环境两系统在绿色低碳发展中的耦合协调关系目标设计,运用熵值法、耦合协调度模型以及耦合演化模型测度湖南省农业经济发展与生态环境系统综合评价指数,并具体分析二者在时序条件下的静态与动态耦合关系变化... 详细信息

基于探究农业经济发展与生态环境两系统在绿色低碳发展中的耦合协调关系目标设计,运用熵值法、耦合协调度模型以及耦合演化模型测度湖南省农业经济发展与生态环境系统综合评价指数,并具体分析二者在时序条件下的静态与动态耦合关系变化。结果表明:第一,2009—2021年,湖南省农业碳排放总量呈现先增后降的趋势,下降速度不断加快,农业绿色低碳特点显著;第二,在研究期内,湖南省农业经济系统评价指数保持稳定上升态势,生态系统指数则呈现先降后升的趋势,从“经济落后”很快转向“生态滞后”阶段;第三,农业经济发展与生态环境子系统的耦合协调度整体呈加速上升趋势,从0.279跃升至0.828,耦合协调阶段从中度失调衰退演变为良好协调发展;第四,动态耦合度呈现从小到大的变化趋势,表现为协调共存演化到和谐共生的发展阶段。研究结果启示,湖南省应继续坚持以生态强省战略指导农业发展方向,推动农业经济与生态环境协调共振,早日实现二者的高水平耦合协调发展。

关键词：农业经济生态环境绿色低碳系统评价耦合协调度

Peak compression technique in high-performance liquid chromatography

在线全文

学校读者我要写书评

暂无评论

Chinese Science Bulletin 2009年第16期54卷 2805-2809页

作者： WEI YuXia WANG lin XIAO ShengYuan QING Hong ZHU yong HU GaoFei deng Yulin School of Life Science and Technology Beijing Institute of Technology Beijing 100081 China

Peak compression technique based on the difference of the solute migration velocity in two different mobile phases was described theoretically and confirmed using benzaldehyde and 4-hydroxyquinoline (4-HQ) as model compounds. After peak compression, the peak compression factors (the ratio of peak width at half-height under non-compression and that under compression condition) of benzaldehyde and 4-HQ were 0.19 and 0.13, respectively. By this application of the peak compression technique to the mixture, both enhanced peak height and good separation were obtained in one run cycle. This peak compression technique was introduced to determine benzaldehyde from semicarbazide-sensitive amine oxidase-catalyzed enzymetic reaction in order to illustrate the applicability of this technique to the real sample. As a result, the peak was compressed effectively, and 4.94-fold, 19.3-fold and 5.74-fold enhancement in peak height, plate number and signal to noise ratio were also achieved, respectively.

关键词：压缩技术高效液相色谱模型化合物脲甲醛迁移速度羟基喹啉压缩条件运行周期