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Interface reaction during titanium alloys investment casting by residue gas in ceramic mold

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Rare Metals 2019年第4期38卷 327-335页

作者： ya-Meng wei Zhi-Gang Lu xin-Yi Li xin Guo Department of Mechanical Engineering Tsinghua University Beijing 100084 China State Key Laboratory of Tribology Tsinghua UniversityBeijing 100084 China Academy of Opto-Eletronics Chinese Academy of Sciences Beijing 100094 China

The chemical reaction between mold material and titanium melt during investment casting was studied intensively. However, the in fluence of residue gas in ceramic mold on interface reaction remains unclear. In this investigation, the effect of residue gas in Y2O3-silica sol shell mold on interface reaction during Ti-6A1-4V alloy investment casting was investigated. Two groups of shell molds were prepared by adding different kinds of pore formers, i.e., spherical starch particles or nylon fibers, respectively. Ti-6Al-4V alloy was cast under vacuum by gravity casting through cold crucible induction melting (CCIM) method. Porosity of different shell molds was measured based on Archimedean method. Scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS) were employed to characterize the micromorphology and composition of the reaction area, respectively. White light interferometer (WLI) was used to obtain the surface topography of the shell mold. The results show that the direct chemical reaction is very weak for all specimens. The release of residue gas in closed pores is the key factor influencing surface defects. However, open pores make nearly no difference on the interface reaction.

关键词： Titanium alloy Investment casting Residue gas Y2O3: Silica sol

[Construction of a 17 β-estradiol sensor based on a magnetic graphene oxide/aptamer separating material]

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Se pu = Chinese journal of chromatography 2025年第1期43卷 87-95页

作者： xin-Yu Jin Le-Yuan Chen ya-Nna Liu Wen-Jing Xie Han-Yong Peng State Key Laboratory of Environmental Chemistry and Ecotoxicology Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China. University of Chinese Academy of Sciences Beijing 100049 China. School of Environment Hangzhou Institute for Advanced Study University of Chinese Academy of Sciences Hangzhou 310024 China.

17-Estradiol (E2) is a natural steroidal estrogen essential for a variety of physiological functions in organisms. However, external E2, which is renowned for its potent biological effects, is also considered to be an endocrine-disrupting compound (EDC) capable of disturbing the normal operation of the endocrine system, even at nanogram-per-liter (ng/L) concentrations. Studies have revealed that medical and livestock wastewater can be contaminated with E2, which poses potential risks to human health. Currently, the primary method for detecting E2 relies on liquid chromatography-mass spectrometry, which is limited with regard to on-site or large-scale sample testing due to instrumental constraints. Herein, we developed a magnetic graphene oxide (MGO)/aptamer separating material. The MGO was synthesized by creating a water-in-oil microemulsion at 90 ℃, an agarose hydrogel to load the FeO nanoparticles, and layered graphene oxide (GO). In contrast to conventional methods, such as chemical co-precipitation and solvothermal approaches, this method is more time-efficient and does not require high temperature or pressure. Moreover, the use of a physical encapsulation technique for enwrapping the FeO nanoparticles and layered GO eliminates the need for chemical modification. This approach reduces the use of harmful chemicals, ensures complete loading, and results in highly efficient encapsulation. The MGO was characterized using Fourier-transform infrared (FT-IR) spectroscopy and transmission electron microscopy (TEM), as well as dynamic light scattering (DLS) and Zeta potential analyses, which revealed that the FeO nanoparticles had been successfully loaded onto the GO to produce MGO particles mainly around 5 μm in size. Additionally, this study demonstrated that the aqueous MGO dispersion is highly stable. This substance was used to develop a fluorescent biosensor that uses a "turn-on" mechanism to rapidly and highly sensitively detect E2. MGO is capable of adsorbing a fl

关键词： 17-estradiol (E2) fluorescence biosensor magnetic graphene oxide (MGO) magnetic solid phase separation

人工流产术后即时口服避孕药妈富隆的临床观察

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中国计划生育和妇产科 2012年第1期4卷 20-23页

作者：辛亚维李奕王建梅张钰天津医科大学第二医院计划生育科天津300211

目的探讨复方短效口服避孕药妈富隆在人工流产后的应用价值。方法 240例人工流产患者随机分成两组,观察组120例,人工流产术后即日起服用妈富隆1片/d,连服21天;对照组120例,人工流产术后不服用妈富隆。观察两组术后阴道出血量、出血时间... 详细信息

目的探讨复方短效口服避孕药妈富隆在人工流产后的应用价值。方法 240例人工流产患者随机分成两组,观察组120例,人工流产术后即日起服用妈富隆1片/d,连服21天;对照组120例,人工流产术后不服用妈富隆。观察两组术后阴道出血量、出血时间、转经时间,术后并发症以及转经后避孕方法选择情况。结果阴道出血量少于月经量、似月经量和多于月经量的比例观察组和对照组分别为88.2%、8.8%、2.9%和74.8%、17.8%、7.5%;阴道出血时间7d的比例分别为63.7%、21.6%、14.7%和42.1%、32.7%、25.2%;术后转经时间37d的比例分别为72.5%、20.6%、6.9%和48.6%、31.8%、19.6%。术后并发症以及再次妊娠的发生率观察组明显低于对照组;人工流产转经后选择使用口服避孕药避孕的比例观察组明显高于对照组;以上各项两组比较差异均有统计学意义(P<0.05)。结论人工流产后即时应用复方短效口服避孕药能减少阴道出血量、缩短出血时间,促进月经恢复,降低近期和远期并发症,提高避孕药的使用率,减少重复流产。

关键词：避孕药妈富隆人工流产并发症

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肿瘤病区医院感染的分析及护理

天津护理 2003年第2期11卷 92-94页

作者：刘亚新王亚霞魏琴何晓岚浙江省人民医院浙江省人民医院浙江杭州 310014

目的:探讨肿瘤病区医院感染的特点和预防措施。方法:对介入、放疗科医院感染病例98例进行回顾性分析。结果:肿瘤病区医院感染发病率高,医院感染部位以下呼吸道为主,病原菌以念珠菌和革兰氏阴性菌为多,并与患者的机体免疫力、年龄及免疫... 详细信息

目的:探讨肿瘤病区医院感染的特点和预防措施。方法:对介入、放疗科医院感染病例98例进行回顾性分析。结果:肿瘤病区医院感染发病率高,医院感染部位以下呼吸道为主,病原菌以念珠菌和革兰氏阴性菌为多,并与患者的机体免疫力、年龄及免疫抑制剂的使用有关。结论:预防和降低医院感染发生率可采用预见性护理,其主要做法:严格无菌技术;早期发现感染征象;切断感染途径;提高患者机体免疫力、尽量减少免疫抑制剂的使用。

关键词：肿瘤医院感染护理

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女性生殖道解脲脲原体感染及耐药性分析

现代预防医学 2015年第12期42卷 2186-2187+2200页

作者：张步美王建梅霍彦张钰辛亚维殷文静天津医科大学第二医院计划生育科

目的分析女性生殖道感染患者的解脲脲原体感染以及耐药性情况。方法对148例女性生殖道感染患者进行解脲脲原体分离培养,并对阳性标本用药敏试剂盒进行药物敏感试验。结果 148例患者中,解脲脲原体培养阳性81例,阳性率为54.7%。解脲脲原... 详细信息

目的分析女性生殖道感染患者的解脲脲原体感染以及耐药性情况。方法对148例女性生殖道感染患者进行解脲脲原体分离培养,并对阳性标本用药敏试剂盒进行药物敏感试验。结果 148例患者中,解脲脲原体培养阳性81例,阳性率为54.7%。解脲脲原体耐药性最强的是环丙沙星,耐药率70.3%,其次为氧氟沙星,耐药率为64.2%,药敏性最强的是交沙霉素,耐药率为4.9%。结论女性生殖道感染患者的解脲脲原体感染率较高,UU对大环内酯类和四环素类的抗菌素具有较高的敏感性,体外药物敏感性试验对指导治疗有重要的临床意义,通过合理用药可以提高临床治愈率。

关键词：生殖道感染解脲脲原体药物敏感试验

Metastable seed-crystals: epitaxial growth of branched-array organic heterostructure nanowires

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Science China Chemistry 2025年

作者： Jin Feng Zhen-Yu Geng Ting-yao Song Ying-xin Ma Chuan-Zeng Wang wei Zhang Hong-Tao Lin Jin Zhou Shu-Ping Zhuo Shu-Hai Chen Xue-Dong Wang School of Chemistry and Chemical Engineering Shandong University of Technology Institute of Functional Nano & Soft Materials (FUNSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials & DevicesSoochow University College of Chemistry and Chemical Engineering Hunan Normal University

Tunable light–matter interactions are exhibited by organic low-dimensional crystals, making these crystals a promising platform for organic photonics. However, the precise synthesis of organic low-dimensional crystals remains challenging due to the stochastic nature of molecular nucleation processes. Herein, the directed nucleation process is driven by the introduction of metastable seed-crystals as the trunk, which ultimately leads to branched-array organic heterostructures. The successful formation of organic heterostructures with high-density branched arrays is attributed to the highest attachment energy (Eatt（023）=-104.25 kcal mol-1) of the exposed （023） crystal plane during the seed-crystal growth route. Significantly, these as-prepared heterostructures inherently have an ultralow lattice mismatch ratio η of 0.7%between trunk and branch, which contributes to the multi-channel photon transportation. Therefore, this work provides valuable insights into a versatile synthetic strategy for accessing low-dimensional heterostructures for integrated optoelectronics.

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皮壳青霉原生质体制备及其形成方式研究

微生物学杂志 2013年第1期33卷 66-70页

作者：冉昇孙惜时任娇信亚伟崔桂友扬州大学旅游烹饪学院营养系江苏扬州225127

通过对溶壁酶液浓度、酶解时间、酶解温度、菌体预处理方法等因素的实验研究,获得了一种制备皮壳青霉原生质体的有效方法。最佳条件为超声法预处理(300 W,28℃,20 min)的菌体材料,采用10 mg/mL的酶解液34℃酶解作用4 h,此条件下原生质... 详细信息

通过对溶壁酶液浓度、酶解时间、酶解温度、菌体预处理方法等因素的实验研究,获得了一种制备皮壳青霉原生质体的有效方法。最佳条件为超声法预处理(300 W,28℃,20 min)的菌体材料,采用10 mg/mL的酶解液34℃酶解作用4 h,此条件下原生质体的形成量达到4.71×106个/mL。同时对原生质体的形成释放方式进行了跟踪观察,发现了包括顶端释放、侧位释放、菌丝段端位释放和原位释放以外的另一种全新的类似酵母"出芽"的释放形式。

关键词：皮壳青霉原生质体制备原生质体释放方式超声预处理

Mechanism of action of Linggui Zhugan Decoction in treating non-alcoholic fatty liver disease using untargeted metabolomics approach

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Traditional Medicine Research 2025年第2期10卷 65-76页

作者： Huan Pei Ren-Lin Li xin-Ran Song Qian-Qian Wan Yu-Ming Wang Han-Zhou Li wei-Quan Xu Jia-Bao Liao wei-Bo Wen Jing Miao Huan-Tian Cui School of Basic Medicine Yunnan University of Chinese MedicineKunming 650599China School Clinical Medical College Yunnan University of Chinese MedicineKunming 650599China First School of Clinical Medicine Yunnan University of Chinese MedicineKunming 650599China School of Integrative Chinese and Western Medicine Tianjin University of Traditional Chinese MedicineTianjin 301617China Department of Pharmacy Tianjin Second People's HospitalTianjin 300192China

Background:Non-alcoholic fatty liver disease(NAFLD)is a liver disorder characterized by the accumulation and degeneration of fat in the liver cells,a condition that may further deteriorate and lead to cirrhosis and liver *** studies showed that metabolic dysfunction can promote NAFLD *** Zhugan Decoction(LGZGD)has therapeutic effects on *** mechanism of LGZGD still remains *** study was to examine the impact of LGZGD on the metabolic processes involved in the development of ***:A mice model of NAFLD was treated with *** therapeutic potential of LGZGD was evaluated by assessing the activity of transaminases,lipids levels of blood,and pathological changes in the liver of the mice model of ***,this study also evaluated the influence of LGZGD on liver inflammation and oxidative ***:The results of untargeted metabolomics analysis showed that LGZGD reduced the disordered lipid metabolism in NAFLD *** improved the oxidative stress and also reduced the levels of pro-inflammatory cytokines in the *** metabolomics analysis of liver samples revealed that LGZGD treatment improved metabolic disorders,including alanine,aspartate,glutamate,glycerophospholipid metabolism,and citrate *** RT-qPCR and Western blot results showed that LGZGD could regulate the expression of key enzymes in the metabolic pathway of the citrate cycle,including ATP-citrate lyase(ACLY),alanine-glyoxylate aminotransferase-2(AGXT2),phosphatidylethanolamine N-methyltransferase(PEMT),and succinate dehydrogenase(SDH).Conclusion:We found that LGZGD can treat NAFLD by reducing inflammatory responses,inhibiting oxidative stress,regulating alanine,aspartate,glutamate,and glycerophospholipid metabolism,and citrate cycle pathways.

关键词： NAFLD LGZGD untargeted metabolomics glycerophospholipid metabolism citrate cycle

Temperate northern hemisphere dominates the global soil CH_(4) sink

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Journal of Mountain Science 2022年第11期19卷 3051-3062页

作者： XU xin wei Da QI ya-hui WANG Xiao-dan Institute of Mountain Hazards and Environment Chinese Academy of SciencesChengdu 610041China University of Chinese Academy of Sciences Beijing 100049China

Methane(CH_(4)) is the second largest longlived greenhouse gas after the CO_(2), which contributes 20% of global warming forcing. Global aerated soils remove CH_(4) from the troposphere, but the quantification of its magnitude and spatial variability is still of a large uncertainty. This study collected 1240records of the CH_(4) uptake by soils across the *** estimates update the global soil CH_(4) sink to 31.9+/-0.16 Tg CH_(4) a^(-1), 42% higher than the previous inventory-based estimation, with 56% from temperate regions. Also, our dataset revealed that the global drylands dominated the soil CH_(4) sink, which is different from traditional forest-dominated *** the past four decades, the soil porosity affected by soil moisture controls the variation in the uptake in the tropics, while warming temperatures benefit methanotrophs in temperate and boreal soils,especially the drylands, where the soil porosity is not limiting. Our simulations indicate that the CH_(4) uptake will increase by 11%–31% by the end of the 21st century, much lower than the previous *** study substantially constrains the global soil CH_(4) sink estimates and reveals the warming temperate northern hemisphere is a dominant CH_(4) uptake region in the past and future, while the uptake decreases in tropical soils under increasing precipitation.

关键词： Climate change Methane uptake Northern hemisphere Observations Simulations