Search results for: Ya Mao

Items from 1 to 20 out of 26 results

article

Approaching Splendid Catalysts for Li–CO₂ Battery from the Theory to Practical Designing: A Review

Qing Pan, Xianpeng Ma, Haoji Wang, Yuming Shu, more

Advanced Materials > 36 > 38 > n/a - n/a

Lithium carbon dioxide (Li–CO₂) batteries, noted for their high discharge voltage of approximately 2.8 V and substantial theoretical specific energy of 1876 Wh kg⁻¹, represent a promising avenue for new energy sources and CO₂ emission reduction. However, the practical application of these batteries faces significant hurdles, particularly at high current densities and over extended cycle lives, due...

article

Vicarious trauma in nursing: A hybrid concept analysis

Yanming Wu, Enhui Bo, Erming Yang, Ya Mao, more

Journal of Clinical Nursing > 33 > 2 > 724 - 739

Background Vicarious trauma can significantly affect the physical and mental health of nurses, as well as their ability to provide quality of care. However, the concept of vicarious trauma has received limited attention and remains controversial in the nursing context. Objective The purpose of this study was to clarify and define the concept of vicarious trauma as it pertains to the nursing context...

article

Stereoselective Intermolecular [4+2] Process of N,O‐acetals with Terminal Alkynes for Construction of Functional cis‐Pyrido and Pyrrolo[1,2‐c][1,3]oxazin‐1‐ones

Chen Wang, Zhuo‐Ya Mao, Yi‐Wen Liu, Qiao‐E Wang, more

Advanced Synthesis & Catalysis > 362 > 4 > 822 - 831

A diastereoselective approach to access cis‐pyrido and pyrrolo[1,2‐c][1,3]oxazin‐1‐ones has been developed through a one‐pot BF₃^.Et₂O‐catalyzed [4+2] process starting with N,O‐acetals and terminal alkynes. In addition, the utility of this transformation is demonstrated by the scalable synthesis of (+)‐Febrifugine in 7 steps from the N,O‐acetal (15% overall yield).

article

An improved model for BDS satellite ultra-rapid clock offset prediction based on BDS-2 and BDS-3 combined estimation

Chao Hu, Qianxin Wang, Yanghai Min, Ya Mao, more

Acta Geodaetica et Geophysica > 2019 > 54 > 4 > 513-543

Ultra-rapid clock products provide the main parameters for real-time or near real-time precise point positioning services. However, it has been found that BeiDou ultra-rapid clock offsets do not meet the requirements for high-accuracy applications because of their low accuracy, especially regarding the prediction parts. This study proposes an improved model for BDS satellite ultra-rapid clock offset...

article

A phase I study evaluating combined nimotuzumab and neoadjuvant chemoradiotherapy followed by surgery in locally advanced esophageal cancer

Saichun Qi, Ya Mao, Mingjun Jiang

Cancer Chemotherapy and Pharmacology > 2019 > 84 > 5 > 1115-1123

Objective The aim of this study was to evaluate the safety and efficacy of combined nimotuzumab and neoadjuvant chemoradiotherapy followed by surgery in locally advanced esophageal cancer. Methods Patients with clinically resectable, locally advanced esophageal cancer treated with neoadjuvant chemoradiotherapy plus nimotuzumab were eligible for study participation. Radiotherapy was administered...

article

An adaptive Kalman filter based on variance component estimation for a real-time ZTD solution

Xu Yang, Guobin Chang, Qianxin Wang, Shubi Zhang, more

Acta Geodaetica et Geophysica > 2019 > 54 > 1 > 89-121

The Global Navigation Satellite System (GNSS) precise point positioning (PPP) technology is currently used to process GNSS water vapor observations in real time or near real time. Further developments are required to improve the accuracy and real-time performance of processing tropospheric delays from which the water vapor observations are extracted. In real-time BDS/GPS precise clock correction estimation...

article

New clock offset prediction method for BeiDou satellites based on inter-satellite correlation

Ya Mao, Qian-xin Wang, Chao Hu, Hong-yi Yang, more

Acta Geodaetica et Geophysica > 2019 > 54 > 1 > 35-54

During the on-orbit operation of BeiDou satellites, the on board atomic clocks of these satellites are easily affected by changes in the space environment. Since the clock offsets of BeiDou satellites derived from multi-satellite clock estimation exhibit correlation among one another. In this study, the correlation among the clock offsets of BeiDou satellites is analyzed and the influence of correlation...

article

Divergent syntheses of L-733, 060 and CP-122721 from functionalized pieridinones made by one-pot tandem cyclization

Yi-Wen Liu, Zhuo-Ya Mao, Rui-Jun Ma, Jia-Hang Yan, more

Tetrahedron > 2017 > 73 > 15 > 2100-2108

An efficient diastereoselective approach to access trans-5-hydroxy-6-substituted 2-piperidinones skeleton has been developed through one-pot intramolecular tandem process of O-benzyl protected aldimine 11 with Grignard reagents. The diastereoselectivity of substitution at C-6 position of 2-piperidinone was controlled by α-benzyloxy group. In addition, the utility of this straightforward cascade process...

article

Studies toward asymmetric synthesis of hoiamides A and B

Ming Li, Pan Han, Zhuo-Ya Mao, Wen Zhou, more

Tetrahedron Letters > 2016 > 57 > 50 > 5620-5623

A convenient method for diastereoselective synthesis of the key intermediate 5 from triheterocyclic fragment and polyketide 6 for hoiamides A (1) and B (2) was developed. The main feature is the successive construction of four stereogenic centers from C33 to C36 for hoiamides A (1) through the well-established Oppolzer’s anti-aldol and Paterson’s anti-aldol methodology. Furthermore, asymmetric allylation...

article

Asymmetric synthesis of epohelmins A, B and 3-epi ent-epohelmin A

Chang-Mei Si, Yi-Wen Liu, Zhuo-Ya Mao, Pan Han, more

Tetrahedron > 2016 > 72 > 49 > 8091-8098

An efficient method for asymmetric synthesis of epohelmins A (3), B (4) and their isomer 24 is detailed in this report. The key feature in this divergent synthesis includes the SmI₂-induced cross-coupling of N-tert-butanesulfinyl imine 10 with chiral aldehyde 9 derived from d-malic acid. A cascade cyclization to the pyrrolizidine skeleton is achieved in our synthetic route for epohelmins. In addition,...

article

Mesoporous SiO2 yolk shell confined core-satellite Ag nanoparticles: Preparation and catalytic activity

Ya Mao, Wanquan Jiang, Sheng Wang, Mei Liu, more

Journal of Alloys and Compounds > 2016 > 680 > C > 406-414

In this work, novel mesoporous SiO₂ yolk-shell confined core-satellite Ag nanoparticles (Ag@mSiO₂) synthesized with a simple route were reported. Firstly, the core/shell Ag@C nanospheres whose carbon shells were doped with Ag nanoparticles, were facilely prepared by using a simple hydrothermal method. After coating with a uniform layer of hybrid SiO₂ in the presence of octadecyltrimethoxysilane (C...

article

A divergent approach for asymmetric syntheses of (+)-spicigerine, (+)-cassine and their 3-epimers

Pan Han, Chang-Mei Si, Zhuo-Ya Mao, Hai-Tong Li, more

Tetrahedron > 2016 > 72 > 6 > 862-867

An efficient approach for asymmetric synthesis of (+)-spicigerine, (+)-cassine and their 3-epimers has been developed through the intramolecular diastereoselective tandem addition/cyclisation process of α-chiral aldimine 9 with methylmagnesium bromide and the asymmetric addition of nucleophilic reagents to aminal 14. Moreover, the first asymmetric synthesis of (+)-spicigerine has been achieved in...

article

Therapeutic effect of acupuncture combining standard swallowing training for post-stroke dysphagia: A prospective cohort study

Li-ya Mao, Li-li Li, Zhong-nan Mao, Yan-ping Han, more

Chinese Journal of Integrative Medicine > 2016 > 22 > 7 > 525-531

Objective To assess the therapeutic effect of acupuncture combining standard swallowing training for patients with dysphagia after stroke. Methods A total of 105 consecutively admitted patients with post-stroke dysphagia in the Affiliated Hospital of Gansu University of Chinese Medicine were included: 50 patients from the Department of Neurology and Rehabilitation received standard swallowing training...

article

Effect of nitrogen-doped carbon/Ketjenblack composite on the morphology of Li2O2 for high-energy-density Li–air batteries

Huan Lin, Zixuan Liu, Ya Mao, Xianjun Liu, more

Carbon > 2016 > 96 > C > 965-971

A series of nitrogen-doped carbon/Ketjenblack (KB) composites is synthesized by pyrolyzing nitrogen-containing ionic liquid (IL) on KB. The obtained composites have a significant effect on the morphology of Li₂O₂ in nonaqueous Li–air batteries. As the surface catalytic layer, the nitrogen-doped carbon significantly enhances the discharge capacity to >9905 mAh g⁻¹ in artificial dry air, comparable...

article

Divergent synthesis of L-685,458 and its analogues involving one-pot intramolecular tandem sequence reaction

Chang-Mei Si, Zhuo-Ya Mao, Zhu Zhou, Zhen-Ting Du, more

Tetrahedron > 2015 > 71 > 50 > 9396-9402

The one-pot tandem process of (2R,4R,S_RS)-15 with Grignard reagents for highly diastereoselective synthesis of functionalized 2-piperidinone 1 was developed. Furthermore, the divergent syntheses of L-685,458 3 and its six analogues 20a–f have been conveniently achieved using this effective protocol as the key step.

article

Asymmetric synthesis of emericellamide B

Rong-Guo Ren, Jing-Yi Ma, Zhuo-Ya Mao, Yi-Wen Liu, more

Chinese Chemical Letters > 2015 > 26 > 10 > 1209-1215

Asymmetric total synthesis of emericellamide B (9.4%, 17 longest linear steps) is detailed in this report. In this synthetic route, the highly methylated (2R,3R,4S,6S)-3-hydroxy-2,4,6-trimethyldodecanoic acid (HTMD) unit was effectively prepared through the asymmetric methylation, Wittig and Horner–Wadsworth–Emmons reaction. Moreover, pentafluorophenyl diphenylphophinate (FDPP) proved to be an effective...

article

Studies toward asymmetric synthesis of leiodelide A

Rong-Guo Ren, Ming Li, Chang-Mei Si, Zhuo-Ya Mao, more

Tetrahedron Letters > 2014 > 55 > 50 > 6903-6906

An enantioselective route for oxazoline 4, a key fragment toward the asymmetric synthesis of leiodelide A, is described. We synthesized northern subunit 6 through a Julia–Lythgoe olefination and subsequent Sharpless asymmetric dihydroxylation. Moreover, a highly diastereoselective method using well-established Evans’ asymmetric aldol condensation was developed for preparation of southern fragment...

article

Flexible approach for the asymmetric synthesis of (−)-hyacinthacine A1 and its 7a-epimer

Chang-Mei Si, Zhuo-Ya Mao, Rong-Guo Ren, Zhen-Ting Du, more

Tetrahedron > 2014 > 70 > 43 > 7936-7941

The diastereoselective nucleophilic addition of organic boronic ester to 3-hydroxy-2-substituted N-acyliminium ions 9 led to the formation of 2,5-cis-pyrrolidine 10, from which a convenient synthesis of (−)-7a-epi-1 was developed. In addition, an efficient asymmetric synthesis of (−)-hyacinthacine A1 1 was achieved through the reduction/ring-opening process.

article

Corrigendum to “Polythiophene coordination complexes as high performance lithium storage materials” [J. Power Sources 248 (2014) 343–347]

Ya Mao, Qingyu Kong, Lian Shen, Zhaoxiang Wang, more

Journal of Power Sources > 2014 > 254 > Complete > 361

article

Polythiophene coordination complexes as high performance lithium storage materials

Ya Mao, Qingyu Kong, Lian Shen, Zhaoxiang Wang, more

Journal of Power Sources > 2014 > 248 > C > 343-347

Polythiophene (PTh)-based coordination complexes, polythiophene–iron (PTh–Fe) and polythiophene–iron–oxygen (PTh–Fe–O) were synthesized by chemical method and proved to be novel high-performance organometallic lithium-storage materials. Extended X-ray absorption ﬁne structural (EXAFS) spectroscopy and density functional theory (DFT) calculations indicate that these complexes have layered structures...

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INFONA - science communication portal

Search results for: Ya Mao

Approaching Splendid Catalysts for Li–CO₂ Battery from the Theory to Practical Designing: A Review

Vicarious trauma in nursing: A hybrid concept analysis

Stereoselective Intermolecular [4+2] Process of N,O‐acetals with Terminal Alkynes for Construction of Functional cis‐Pyrido and Pyrrolo[1,2‐c][1,3]oxazin‐1‐ones

An improved model for BDS satellite ultra-rapid clock offset prediction based on BDS-2 and BDS-3 combined estimation

A phase I study evaluating combined nimotuzumab and neoadjuvant chemoradiotherapy followed by surgery in locally advanced esophageal cancer

An adaptive Kalman filter based on variance component estimation for a real-time ZTD solution

New clock offset prediction method for BeiDou satellites based on inter-satellite correlation

Divergent syntheses of L-733, 060 and CP-122721 from functionalized pieridinones made by one-pot tandem cyclization

Studies toward asymmetric synthesis of hoiamides A and B

Asymmetric synthesis of epohelmins A, B and 3-epi ent-epohelmin A

Mesoporous SiO2 yolk shell confined core-satellite Ag nanoparticles: Preparation and catalytic activity

A divergent approach for asymmetric syntheses of (+)-spicigerine, (+)-cassine and their 3-epimers

Therapeutic effect of acupuncture combining standard swallowing training for post-stroke dysphagia: A prospective cohort study

Effect of nitrogen-doped carbon/Ketjenblack composite on the morphology of Li2O2 for high-energy-density Li–air batteries

Divergent synthesis of L-685,458 and its analogues involving one-pot intramolecular tandem sequence reaction

Asymmetric synthesis of emericellamide B

Studies toward asymmetric synthesis of leiodelide A

Flexible approach for the asymmetric synthesis of (−)-hyacinthacine A1 and its 7a-epimer

Corrigendum to “Polythiophene coordination complexes as high performance lithium storage materials” [J. Power Sources 248 (2014) 343–347]

Polythiophene coordination complexes as high performance lithium storage materials

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