检索结果-南通市图书馆

Synthesis and characterization of arsenate antimonic acid AAAc(1 : 1)

在线全文

学校读者我要写书评

暂无评论

Journal of Central South University of Technology 2005年第Z1期12卷 76-81页

作者： wang xue-wen CHEN Qi-yuan YIN Zhou-lan ZHANG Ping-min wang Yu-wen School of Metallurgical Science and Engineering Central South University Changsha 410083 China School of Chemistry and Chemical Engineering Central South University Changsha 410083 China School of Chemistry and Chemical Engineering Central South University Changsha 410083 China School of Chemistry and Chemical Engineering Central South University Changsha 410083 China Chemistry Department Jinggangshan Normal College Ji''an 343009 China

The AAAc(1 : 1) was synthesized in water by As2O3 and Sb2O3 with molar ratio of 1 : 1: AAAc(1 : 1)was characterized by Raman, IR, TG/DTG, DSC, XPS and XRD. The results show that there are four peaks to vsof As-OH, As-O-Sb, Sb-OH and Sb-O-Sb in Raman spectra of AAAc(1 : 1) at 100 - 1 000 cm-1. The solution of AAAc(1 : 1) was also titrated with KOH solution. The titration results show that AAAc(1 : 1) is a hexabasic acid with dissociation constants of k1 = 3.62 × 10-2 , k2 = 3.05 × 10-3 , k3 = 6. 43 × 10-6 , k4 = 9. 78 × 10-8 ,k5 = 1.32 × 10-11 , k6 =3.87 × 10-12. AAAc(1 : 1) has a good solubility and stability in water, its solid obtained by free volatilizing water from its solution under air at ambient temperature is amorphous. Chemical and thermal analyture of AsO ( OH )2-OH-Sb ( OH )4-O-Sb ( OH )4-OH-AsO ( OH )2 or As ( OH )3-O-Sb(OH)4-O-Sb(OH)4-O-As(OH)3 (isomerism) through experimental determination and geometry optimization.

关键词： arsenic acid antimonic acid arsenate antimonic acid

The Responses of Morphological Trait,Leaf Ultrastructure,Photosynthetic and Biochemical Performance of Tomato to Differential Light Availabilities

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

Agricultural Sciences in China 2011年第12期10卷 1887-1897页

作者： FU Qiu-shi ZHAO Bing wang xue-wen wang Yu-jue REN Shu-xin GUO Yang-dong College of Agriculture ＆ Biotechnology China Agricultural University Beijing 100193 P.R. China School of Agriculture Virginia State University Petersburg VA23806 USA Department of Horticulture Cornell University Ithaca NY14853 USA

The whole-plant morphology, leaf ultrastructure, photosynthesis as well as enzyme activities of two tomato cultivars （Meifen-2 and Hongsheng） to differential light availabilities （450-500 gmol m-2 s-1, 75-100 gmol m-2 s^-1） were examined in controlled environment. The results showed that the plant biomass and root/shoot ratio decreased and the specific leaf area increased significantly under the low light condition. There was a significant increase in malondialdehyde （MDA） concentration, superoxide dismutase （SOD） and peroxidase （POD） activities and decrease in soluble sugar and protein contents in LL-grown plants. For both cultivars, downregulation of photosynthesis and electron transport components were observed in LL-grown plants, the inhibition of the photosynthesis under the LL condition could be partially explained by the decrease of stomata density and by the changes of chloroplast.

关键词： chlorophyll fluorescence chloroplast photosynthesis stomata tomato

经内镜逆行胰胆管造影胆管支架置入术对老年恶性梗阻性黄疸患者免疫炎性反应及肝功能的影响

在线全文

学校读者我要写书评

暂无评论

实用医院临床杂志 2024年第2期21卷 140-144页

作者：李俊罗国松郑英俊王学文四川省自贡市第四人民医院肝胆胰脾诊疗中心四川自贡643000

目的探讨经内镜逆行胰胆管造影(ERCP)胆管支架置入术治疗老年恶心梗阻性黄疸(MOJ)患者临床疗效及可能作用机制。方法收集2020年7月至2022年6月在我院接受胆管支架置入术治疗的老年MOJ患者102例临床资料,根据胆管支架置入方式分为ERCP组... 详细信息

目的探讨经内镜逆行胰胆管造影(ERCP)胆管支架置入术治疗老年恶心梗阻性黄疸(MOJ)患者临床疗效及可能作用机制。方法收集2020年7月至2022年6月在我院接受胆管支架置入术治疗的老年MOJ患者102例临床资料,根据胆管支架置入方式分为ERCP组(54例)与PTCD组(48例),比较两组手术成功率与临床疗效、细胞免疫功能、炎性因子、肝功能、不良反应等指标。结果ERCP组低位梗阻患者手术成功率、临床疗效高于PTCD组(χ^(2)=4.193,4.877,P<0.05);CD3^(+)、CD4^(+)、CD4^(+)/CD8^(+)高于PTCD组,CD8^(+)低于PTCD组(P<0.05);血清C-反应蛋白(CRP)、白细胞介素-6(IL-6)、肿瘤坏死因子-α(TNF-α)低于PTCD组(P<0.05);血清谷草转氨酶(AST)、谷丙转氨酶(ALT)、总胆红素(TBil)、直接胆红素(DBil)低于PTCD组(P<0.05);导管堵塞等并发症7.41%低于PTCD组22.92%(χ^(2)=4.873,P<0.05)。结论ERCP胆管支架置入能够提高手术治疗效果,减少并发症的发生,可能与调节细胞免疫功能、抑制炎症反应、改善肝功能等因素有关。

关键词：恶性梗阻性黄疸胆管支架置入经内镜逆行胰胆管造影免疫炎性反应肝功能

局部应用氨甲环酸减少拇外翻矫正术后疼痛的疗效分析

在线全文

学校读者我要写书评

暂无评论

临床药物治疗杂志 2024年第5期22卷 53-56,86页

作者：武丹威孙宁任爽王学文张威首都医科大学附属北京积水潭医院药学部北京100035 首都医科大学附属北京积水潭医院足踝外科北京100035

目的评估拇外翻矫正术中截骨面局部应用氨甲环酸减少术后疼痛的早期疗效。方法选取2022年7—11月首都医科大学附属北京积水潭医院足踝外科收治的拇外翻行矫正术患者资料。根据是否局部应用氨甲环酸,分为氨甲环酸组和对照组。当疼痛强度... 详细信息

目的评估拇外翻矫正术中截骨面局部应用氨甲环酸减少术后疼痛的早期疗效。方法选取2022年7—11月首都医科大学附属北京积水潭医院足踝外科收治的拇外翻行矫正术患者资料。根据是否局部应用氨甲环酸,分为氨甲环酸组和对照组。当疼痛强度大于5分时给予阿片类药物。统计患者一般资料,手术时间,术中出血量,术后12、24、36 h视觉模拟评分法(VAS)疼痛评分,是否应用阿片类药物及不良反应等。结果共纳入患者23例,氨甲环酸组11例,对照组12例。氨甲环酸组和对照组在性别、年龄、BMI、内科疾病、过敏、腰麻、手术等待时间、住院时间比较差异均无统计学意义(P>0.05);在手术时间、出血量方面差异亦无统计学意义(P>0.05)。氨甲环酸组有6例患者应用了阿片类药物,对照组有11例患者应用了阿片类药物,两组比较差异有统计学意义(P005);术后24 h氨甲环酸组平均分为(1.73±0.47)分,对照组为(1.75±0.45)分;术后36 h氨甲环酸组平均分为(1.81±0.40)分,对照组为(1.75±0.45)分,术后24 h、36 h评分两组比较差异亦无统计学意义(均P>0.05)。两组患者均未发生不良反应。结论拇外翻矫正术中局部应用氨甲环酸能减少阿片类药物用量,可能减轻术后疼痛。

关键词：氨甲环酸拇外翻矫正术疼痛

Metasurface array for single-shot spectroscopic ellipsometry

在线全文

学校读者我要写书评

暂无评论

Light(Science & Applications) 2024年第5期13卷 835-842页

作者： Shun wen Xinyuan xue Shuai wang Yibo Ni Liqun Sun Yuanmu Yang Department of Precision Instrument State Key Laboratory of Precision Measurement Technology and InstrumentsTsinghua UniversityBeijing 100084China

Spectroscopic ellipsometry is a potent method that is widely adopted for the measurement of thin film thickness and refractive *** conventional ellipsometers utilize mechanically rotating polarizers and grating-based spectrometers for spectropolarimetric ***,we demonstrated a compact metasurface array-based spectroscopic ellipsometry system that allows single-shot spectropolarimetric detection and accurate determination of thin film properties without any mechanical *** silicon-based metasurface array with a highly anisotropic and diverse spectral response is combined with iterative optimization to reconstruct the full Stokes polarization spectrum of the light reflected by the thin film with high ***,the film thickness and refractive index can be determined by fitting the measurement results to a proper material model with high *** approach opens up a new pathway towards a compact and robust spectroscopic ellipsometry system for the high throughput measurement of thin film properties.

关键词： properties. spectroscopic film

Effect of nourishing Yin and purging fire Chinese herbal mixture on delaying light-induced premature puberty in rats

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 Traditional Chinese Medicine 2024年第1期44卷 95-102页

作者： SUN Yanyan xue Yuanyuan SUN wen wang Yonghong YU Jian Department of Traditional Chinese Medicine Children's Hospital of Fudan UniversityShanghai 201102China Department of Pediatrics Zibo Central HospitalZibo 255000China

OBJECTIVE:To elucidate the mechanism of the nourishing Yin and purging fire Chinese herbal mixture(NYPF)in delaying light-induced premature puberty in ***:Twenty-one days old female SpragueDawley rats were randomly assigned to normal group(N),long light exposure group(L),NYPF and normal saline group(NS).Rats in the L,NYPF and NS groups were exposed to 16 h:350 lux light/8 h:dark,while rats in the N group were exposed to 12 h:50 lux light/12 h:*** and normal saline was administered to the rats in the NYPF group or NS group,respectively,from day *** rats in every group were sacrificed at 9 *** day 28(P28),on the day when rat's vulva opened in the L group(L-VO),on the day when the first estrous interphase occurred in rats of L group(L-E1),and on the day when the second estrous interphase occurred in rats of L group(L-E2),***:On day 34,all rats in the L group,80%of rats in the NS group,40%of rats in the N group,and 20%of rats in the NYPF group showed complete opening of the *** P28,m RNA level of hypothalamic kisspeptin(Kiss-1)in the L group was significantly higher than that in the N group(P<0.05).The rats in the L and NS groups had significantly lower hypothalamic argininephenylalanine-amide(RFamide)-related peptide 3(RFRP-3)m RNA levels than those in the N group(P<0.05),whereas RFRP-3 m RNA level was significantly higher in the NYPF group than that in the L group(P<0.05).At L-VO,the ovarian index of the L and NS groups was significantly higher than that of the N group(P<0.05)and estradiol(E2)level of the NYPF group was significantly lower than that of the N and NS groups(P<0.05);hypothalamic Kiss-1 m RNA level in the L and NS groups was significantly higher than that in the N and NYPF groups(P<0.05),whereas hypothalamic RFRP-3 m RNA level in the L,NYPF,and NS groups was significantly lower than that in the N group(P<0.05).At L-E1,E2 level of the L and NS groups was significantly higher than that of the N group(P<0.01),wher

关键词： light puberty precocious kisspeptins RFRP-3 melatonin Nourishing Yin and Purging Fire

Improving Thermal-oxidative Aging Resistance of Styrene-butadiene Rubber by Antioxidant Loaded Silica Aerogel

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8期42卷 1198-1209页

作者： xue-Fei Ping Yu wang Lu Liu Fu-Yong Liu Hong-Wei He Pi wang wen-wen Yu Qiang Zheng College of Materials Science and Engineering Taiyuan University of TechnologyTaiyuan 030024China Shanxi-Zheda Institute of Advanced Materials and Chemical Engineering Taiyuan 030032China Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and EngineeringZhejiang UniversityHangzhou 310058China

The antioxidant N-isopropyl-N'-phenyl-p-phenylenediamine(4010NA)was dissolved in ethanol and impregnated into silica aerogel(SAG)via vacuum-pressure cycles,yielding composite particles(A-N)with enhanced sustained-release and reinforcing *** effect of A-N on the mechanical properties and thermal-oxidative aging resistance of styrene-butadiene rubber(SBR)vulcanizates was *** and BET assessments indicated that the loading efficiency of 4010NA in SAG reached 14.26%within ethanol's solu bility *** A-N into SBR vulcanizates significantly elevated tensile strength by 17.5%and elongation at break by 41.9%over those with fumed silica and ***,A-N notably enhanced the thermal-oxidative aging resistance of *** aging for 96 h at 100℃,the tensile strength and elongation at break of SBR with A-N sustained 70.09%and 58.61%of their initial values,respectively,with the retention rate of elongation at break being 62.8%higher than that of SBR with fumed silica and free *** study revealed that A-N composite particles significantly inhibited the crosslinking in SBR's molecular chains,reducing hardening and embrittlement during later thermal-oxidative aging stages.

关键词： Styrene-butadiene rubber Silica aerogel Loading modification Thermal-oxidative aging

Improving mathematical model of burden distribution and correcting chute angle to cope with fluctuation of stock line

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2024年第2期31卷 342-356页

作者： Jian-sheng Chen wen-guo Liu Hao Guo wang Ding Qing-guo xue Jing-song wang Hai-bin Zuo State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing100083China MCC Capital Engineering&Research Incorporation Limited Beijing100176China Hunan Valin Xiangtan Iron and Steel Co. Ltd.Xiangtan411101HunanChina

Accurate evaluations of the burden distribution are of critical importance to stabilize the operation of blast *** mathematical model and discrete element method(DEM)are two attractive methods for predicting burden *** on DEM,the initial velocities of the pellet,sinter,and coke were calculated,and the velocity attenuations of the above three particles between the burden and the chute were *** initial velocity and velocity attenuation were applied to a mathematical model for improving the ***,based on the improved model,a scheme for rectifying the chute angles was proposed to address the fluctuation of the stock line and maintain a stable burden *** validity of the scheme was confirmed via a stable burden distribution under different stock *** mathematical model has been successfully applied to evaluate the online burden distribution and cope with the fluctuation of the stock line.

关键词： Burden distribution Mathematical model Discrete element method Velocity attenuation Stock line fluctuation

Design and Cryogenic Performance of a Hexapod Platform for a Large Ground-based Wide Field Survey Telescope

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

Research in Astronomy and Astrophysics 2024年第1期24卷 178-187页

作者： Yang Yu xue-wen wang Yu Zhang Jia-Lin Sun Zhen-Bang Xu Jian-Li wang Changchun Institute of Optics Fine Mechanics and PhysicsChinese Academy of SciencesChangchun 130033China Chinese Academy of Sciences Key Laboratory of On-orbit Manufacturing and Integration for Space Optics System Changchun 130033China University of Chinese Academy of Sciences Beijing 100049China

The thermal gradient is an important factor that causes degradation to the image quality of telescopes. In order to ensure the accurate alignment of the primary focus unit and the primary mirror, the hexapod platform(as a corrector) is investigated in this paper. First, a ground-based telescope with 2.5 m aperture and 3.5 deg field of view is described. The telescope is under construction, and it is expected to be finished in 2023. Second, the hexapod platform with flexure hinges utilized to adjust the primary focus unit is proposed, which is applied as a ***, the inverse kinematics of the platform is established and an open-loop control system is built based on ***, the cryogenic performance test for the hexapod platform is performed. The experimental results show that the resolution and repeatability of the translation for the hexapod platform can be achieved at the micrometer *** resolution and repeatability of the rotation can be achieved at the arc-second level. Therefore, the cryogenic performance of the hexapod platform can meet the optical imaging requirements of the wide-field ground-based telescope. The kinematic analysis and cryogenic performance tests in the paper provide a technical reference for the precise alignment of the primary focus unit and the primary mirror, which can improve the imaging quality of the telescope.

关键词： methods:miscellaneous space vehicles:instruments telescopes miscellaneous