oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Any time

2019 ( 240 )

2018 ( 1803 )

2017 ( 1711 )

2016 ( 1664 )

Custom range...

Search Results: 1 - 10 of 104558 matches for " Xiaoyu Zhang "
All listed articles are free for downloading (OA Articles)
Page 1 /104558
Display every page Item
Preparation of MgAl LDHs Intercalated with Amines and Effect on Thermal Behavior for Poly(vinyl chloride)  [PDF]
Xiaoyu Xue, Hongmei Zhang, Shuhua Zhang
Advances in Materials Physics and Chemistry (AMPC) , 2014, DOI: 10.4236/ampc.2014.412028
Abstract: MgAl LDHs intercalated with CO(NH2)2, NH4Cl and NH3·H2O were prepared by co-precipitation and XRD, FT-IR, TGA-DTA and SEM techniques were employed for characterization. The results indicated that the layer-layer spacing of LDHs was enlarged by 0.169, 0.285 and 0.227 Å with the intercalation of CO(NH2)2, NH+4 and NH3, separately. The effects on thermal stability and degradation behavior of synthesized LDHs where mole ratios of Mg/Al/urea = 3:1:1, Mg/Al/NH4Cl = 3:1:1.5 and Mg/Al/NH3·H2O = 3:1:0.5 were investigated by Congo Red Method and thermogravimetric analysis (TGA) from 25°C - 800°C under N2. The TGA and DTA results showed, by incorporating 5% MgAl-CO(NH2)2 LDH, the dehydrochlorination temperature of PVC composites is 12°C higher than MgAl-NH+4 and MgAl-NH3 LDHs. MgAl-NH3 LDH enhances the ending temperature of the first degradation stage of PVC composites by 8°C compared with MgAl LDH. The LDH intercalated with CO(NH2)2 is proved to be an effective thermal stabilizer for PVC processing.
Structures of LDHs Intercalated with Ammonia and the Thermal Stability for Poly(vinyl chloride)  [PDF]
Xiaoyu Xue, Shuhua Zhang, Hongmei Zhang
American Journal of Analytical Chemistry (AJAC) , 2015, DOI: 10.4236/ajac.2015.64032
Abstract: MgAl-NH3 LDHs (layered double hydroxides), ZnAl-LDHs and ZnAl-NH3 LDHs with different molar ratio of Al/ammonia were synthesized by co-precipitation method. The synthetic LDHs samples were characterized by XRD, FT-IR, TGA-DTG and SEM techniques and tested by Congo red method. In addition, after PVC (Poly vinyl chloride) and DOP (Dioctylphthalate) were added to LDHs, the thermal stability for PVC was characterized by TGA-DTG. The results indicated that LDHs intercalated with ammonia improved thermal stability for PVC significantly, MgAl-NH3 LDHs (Mg2+:Al3+: NH3·H2O = 3:1:0.5) and ZnAl-NH3 LDHs (Zn2+:Al3+:NH3·H2O=2:1:1.5) showed the best thermal stability for PVC, interlayered space of LDHs became larger by intercalating ammonia.
Comparison of the effects of perinatal and neonatal administration of sodium ferulate on repair following excitotoxic neuronal damages induced by maternal oral administration of monosodium glutamate at a late stage of pregnancy  [PDF]
Yongping Zhang, Lijian Yu, Rundi Ma, Xiaoyu Zhang, Tingxi Yu
World Journal of Neuroscience (WJNS) , 2012, DOI: 10.4236/wjns.2012.23025
Abstract: Objective: Our previous studies have revealed that ferulic acid (FA) and sodium ferulate (SF) show significant protective effect on excitotoxicity, the present study was conducted to compare its potential favorable effects of maternal,newborn,and both maternal and newborn intraperitoneal (ip) injection of SF on repair following excitotoxic neuronal damages induced by monosodium glutamate (MSG). Methods: The maternal mice were assigned randomly into seven groups (n = 10 animals in each group): control, 3SF, 20SF, 23SF, MSG, MSG + 3SF, MSG + 20SF, MSG + 23SF groups. The mice at 17 days of pregnancy were treated with or without MSG (2.0 g/kg body weight, ig, once) or/and SF (40 mg/kg body weight, ip), and their offerings treated with or without SF. And then their filial behaviors and hippocampal histopathology were studied. Results: The results showed that maternal, newborn, and both maternal and newborn administration of SF facilitated their filial brain repair, and attenuated the behavioral disorders and histopathological damages of their filial mice in MSG + 3SF, MSG + 20SF, and MSG + 23SF groups in varying degrees. However, the best effects were detected in the filial mice in MSG + 23SF group. Conclusion: Both maternal and newborn administration of SF is conducive to the filial neuronal repair following excitotoxic damages induced by glutamate.
Statisticsoftheinterplanetarymagneticfieldsobservedat0.72AUand1AU
Li,Xiaoyu,Zhang,Tielong
空间科学学报 , 2010,
Abstract: ThispaperpresentstheInterplanetaryMagneticField(IMF)observationsat0.72AUmeasuredbyVenusExpress(VEX)and1AUbyAdvancedCompositionExplorer(ACE)in2007.Thedistributionsofdailyaveragesof$B$arelognormalinbothlocations.Themultiscalestructureofthemagneticfieldfluctuationswasdescribedbystudyingtheincrementsof$B$overarangescalesfrom10minto21.3hours.AlltheProbabilityDistributionFunctions(PDFs)canbedescribedquantitativelybyTsallisdistributionfunction.Ontheeclipticplanefrom0.72AUto1AU,theentropyindexqincreaseswithdistanceoverallscales,indicatingtheintermittencyofturbulenceisgrowing.ThewidthsofthePDFsat0.72AUarelargerthanthoseat1AUatallscales,whichindicatingtheturbulenceat0.72AUismoreintensethanthatat1AU.Thishelpsusunderstandthenatureanddevelopmentofthemagneticfieldfluctuations.
Medical colleges summary of biomedical engineering profession
—Luzhou Medical College in the perspective of biomedical engineering profession
 [PDF]

Bangtao Liu, Min Luo, Minjun Li, Xiaoyu Kang, Chenghu Zhang
Journal of Biomedical Science and Engineering (JBiSE) , 2013, DOI: 10.4236/jbise.2013.63035
Abstract: This paper expounds professional characteristics of biomedical engineering in our school, and analyses some problems lying in it, emphatically discusses advantages and the problems combining biomedical engineering with the medical courses in order to offer targeted solutions. It summarizes the results and problems so as to provide reference value to a new major.
Ethyl Methanesulfonate (EMS)-Mediated Mutagenesis of Cucumber (Cucumis sativus L.)  [PDF]
Lina Wang, Bing Zhang, Jinrui Li, Xiaoyu Yang, Zhonghai Ren
Agricultural Sciences (AS) , 2014, DOI: 10.4236/as.2014.58075
Abstract:

Ethyl methanesulfonate (EMS) is a stable and effective chemical mutagen. In this study, cucumber (Cucumis sativus L. cv. “Shannong No. 5”) seeds were treated by 1% EMS for 12 h, 24 h and 48 h to optimize EMS mutagenesis and determined median lethal dose of EMS (1% EMS and 24 h) for “Shannong No. 5”. After treated by 1% EMS for 24 h, 541 M1 plants were grown in greenhouse for phenotype investigation. The fertility of M1 cucumbers was very low, and only 79 lines produced seeds after self crossing. 60 independent M2 families comprising 600 M2 plants were investigated for phenotypic alteration, and 11 individual mutant lines were isolated into six groups: short-fruit mutants, long-fruit mutants, small-flower mutants, big-flower mutants, opposite-tendril mutants and clustered-leaf mutants. The mutation frequency was 18.3%. Two selected representatives, short-fruit mutants and clustered-leaf mutants, showed 1:3 of segregation ratio in M2 populations. This ratio is consistent with classic Mendelian model, indicating that the two kinds of mutants may be controlled by a single recessive gene, respectively. Long-fruit phenotype was stably inherited and no

Neuroprotective Effects of Sodium Ferulate and Its Antidepressant-Like Effect Measured by Acute and Chronic Experimental Methods in Animal Models of Depression  [PDF]
Yongping Zhang, Lijian Yu, Yanping Wang, Mingneng Liao, Xia Zhang, Rundi Ma, Xiaoyu Zhang, Tingxi Yu
Journal of Behavioral and Brain Science (JBBS) , 2011, DOI: 10.4236/jbbs.2011.12006
Abstract: Antidepressants with novel targets and without side effects are in great demand. Ferulic acid (FA) is a ubiquitous phenolic acid of low toxicity, and sodium ferulate (SF) is its sodium salt. Our previous studies have revealed that FA and SF show significant protective effect on excitotoxicity, we now test its potential neuroprotective and antidepressant-like effects. MTT assay and morphological analysis by fluorescence microscopy were adopted to measure the neuroprotective effects of SF; forced-swimming, tail-suspension, and chronic mild stress (CMS) tests were performed to assess its antidepressant-like activity. The results showed that SF had protection against H2O2-induced oxidative damage and dexamethasone (DXM)-induced neurotoxicity pheochromocytoma (PC12) cells. Acute administration of SF markedly decreased the duration of immobility during forced-swimming in rats and mice and tail-supension tests in mice. However, SF has no any effects on reserpine-induced hypothermia, 5-hydroxytryptophan-induced head-twitch response, and potentiation of noradrenaline toxicity in mice. Chronic administration of SF reversed the effects of CMS on consumption of food and sucrose solution, weight gain, and histopathology of hippocampus by light microscopy, and potently shortened the immobility time during forced-swimming test following CMS in rats. This study provides evidence that SF possesses obviously antidepressant-like activity, and the antidepressant-like effect may result from its neuroprotective effects.
Neurogenesis-enhancing effect of sodium ferulate and its role in repair following stress-induced neuronal damage  [PDF]
Lijian Yu, Yongping Zhang, Mingneng Liao, Yanping Wang, Rundi Ma, Xiaoyu Zhang, Tingxi Yu
World Journal of Neuroscience (WJNS) , 2011, DOI: 10.4236/wjns.2011.12002
Abstract: Ferulic acid (FA) is a ubiquitous phenolic acid of low toxicity, and sodium ferulate (SF) is its sodium salt. Our previous studies have revealed that FA shows neuroprotective effect and significant antidepressant- like effect. The aim of this study was to investigate its potential neurogenesis-enhancing effect and its role in repair following stress-induced neuronal damage. MTT assay was performed to measure the effect of SF on the growth of rat pheochromocytoma (PC12) cells; morphological and immunocytochemical meth- ods were used for assessing its differentiation-induc- ing action. Chronic mild stress (CMS) tests were per- formed to establish rat model of depression. The histopathology of animal brains was studied to ana- lyze CMS-induced morphological changes and the effect of SF on the repair of CMS-induced brain in- jury. The expressions of nerve growth factor (NGF) and brain-derived neurotrophic factor (BDNF) and the proliferation of neural stem cell/neural progenitor cells were assessed in the hippocampi of chronic mild stress (CMS)-induced depression-like model rats by immunohistochemistry and bromodeoxyuridine (BrdU)- incorporation assays, respectively. Our in vitro tests showed that SF promoted the proliferation of PC12 cells in the concentration range of 5 - 320 μM, and induced PC12 cells to differentiate to more mature cells with the morphological characteristics and mo- lecular marker of neuronal-like cells. In vivo tests showed that SF up-regulated the expressions of NGF and BDNF, and induced the proliferation of neural stem cell/neural progenitor cells in the hippocampi of CMS-induced depression-like model rats. This study provides evidences that SF shows neurogenesis-en- hancing effect, and its antidepressant-like effect of SF may be related directly and closely to its above-men- tioned effect.
Efficiency and Advantages of Percutaneous Femoroplasty versus Proximal Femoral Replacement for Proximal Femur Metastases  [PDF]
Jinming Zhang, Jianfa Xu, Ze Li, Xiaoyu Zhang, Hongzeng Wu, Helin Feng
Open Journal of Orthopedics (OJO) , 2018, DOI: 10.4236/ojo.2018.810038
Abstract: Background: The proximal femur is the most common site of bone metastasis, and metastasis at this site can cause chronic, intolerable pain and even result in pathologic fractures, thereby negatively affecting patients’ quality of life. Selecting an appropriate method for resecting metastasis within the proximal femur requires thorough consideration of various factors, including the biological behavior of the primary tumor, the extent of the femur lesion, the current general systemic condition of the patient, and perioperative risks. Objective: To compare the perioperative safety of and early functional recovery following percutaneous femoroplasty (PFP) and proximal femoral replacement (PFR) in treating patients with metastasis of the proximal femur. Methods: We retrospectively analyzed the cases of 53 patients with proximal femur metastases who received surgical treatment by either PFP (n = 28) or PFR (n = 25). Perioperative blood loss, surgical time, and perioperative complications were compared between groups. Pain intensity according to the visual analogue scale (VAS) and early postoperative function according to the Karnofsky Performance Scale (KPS) were evaluated at 3, 7, and 30 days as well as 6 months after surgical treatment. Results: In the PFP group, the VAS scores were lower soon after operation than preoperation (P < 0.05). In the PFR group, compared with the preoperative scores, the VAS scores briefly increased at 3 days postoperation (P < 0.05) and then decreased (P < 0.05). The mean scores of either group at first three follow-up evaluations were significantly different between the two groups (P < 0.01), but not at the 6-month follow-up (P > 0.05). PFP significantly and immediately improved patients’ quality of life as measured by the KPS in the early period after surgery (preoperative vs 3 days postoperative, P < 0.01), but the patients who underwent PFR suffered a short-term decrease in quality of life (preoperative vs 3 days postoperative, P < 0.01). Blood loss (P < 0.01) and operating time (P < 0.01) were significantly less than PFP. The complication rate was higher in the PFR group (28%) than in the PFP group (3.6%). The results also showed no difference in survival time between the two groups. Conclusion: PFP is an attractive minimally invasive therapeutic option for proximal femur metastasis that can significantly improve the patient’s quality of life in the short term.
Are Hong Kong Investors Interested in Shenzhen-Hong Kong Stock Connect
—An Investor Behavior Analysis Based on Shanghai-Hong Kong Stock Connect
 [PDF]

Xiaoyu Liao
Open Journal of Social Sciences (JSS) , 2016, DOI: 10.4236/jss.2016.43036
Abstract: In November 2014, Shenzhen-Hong Kong Stock Connect was opened. It has been more than one year until now. Although its transaction is not as expected, the opening of Shenzhen-Hong Kong Stock Connect is a must. Hong Kong investors investing in the A-share market in the Chinese mainland by Shenzhen-Hong Kong Stock Connect are mainly small- and medium-sized institutional investors who have not obtained QFII quota. Through the analysis of their investment behaviors, we have found that the preference of Hong Kong investors is single and concentrated. They extremely prefer financial blue-chip AH share. They will try to invest in growth stock in the unfamiliar A-share market, mainly mid cap stock with relatively high valuation, relatively low dividend, a certain risk and relatively good growth ability. They prefer information technology shares. The opening of Shenzhen-Hong Kong Stock Connect will bring opportunities different from those of Shenzhen-Hong Kong Stock Connect.
Page 1 /104558
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.