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IEEE International Symposium on Radio-Frequency Integration Technology (RFIT)

作者： ni, xuwen Rhee, Woogeun Wang, Zhihua Tsinghua Univ Inst Microelect Beijing Peoples R China

ISBN: (纸本)9781509012350

This paper describes an ultra-wideband (UWB) transmitter architecture for secure proximity communication. The transmitter achieves high security by utilizing a pseudo-random scrambling method for both frequency hopping in frequency domain and pulse position modulation (PPM) in time domain. In addition, the low transmitted power of -70dBm/MHz not only makes it difficult for other receivers to detect the signal but also makes the transmission worldwide compliant with existing wireless standards. A prototype 3-4GHz proximity transmitter is implemented in 0.18 mu m CMOS. The transmitter achieves 1Mb/s data rate with 0.3mW power from a 1.8V supply.

关键词： Transmitters

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A 1.8mW 2Mb/s Chirp-UWB Transceiver with Burst-Mode Transmission and Slope-Based Detection

A 1.8mW 2Mb/s Chirp-UWB Transceiver with Burst-Mode Transmis...

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IEEE International Symposium on Radio-Frequency Integration Technology (RFIT)

作者： Zhang, Yining ni, xuwen Rhee, Woogeun Wang, Zhihua Tsinghua Univ Inst Microelect Beijing Peoples R China

ISBN: (纸本)9781509012350

This paper presents a 6-8GHz 2Mb/s Chirp-UWB (C-UWB) transceiver implemented in 65nm CMOS. The transceiver performs burst-mode transmission with an optimum duty-cycle control by utilizing a steep digital gradient generation circuit in the transmitter. To enhance sensitivity and interference immunity, a slope detection based decision method is employed in the receiver by utilizing a 2-bit continuous-time sample-and-hold ADC, which obtains more information of the received signal compared to the single-threshold decision. The 2Mb/s transceiver consumes 1.8mW from a 1V supply, achieving an energy efficiency of 0.9nJ/bit.

关键词： Transceivers

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Marine sponges of the genus Stelletta as promising drug sources: chemical and biological aspects

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Acta Pharmaceutica Sinica B 2019年第2期9卷 237-257页

作者： Qihao Wu Bastien Nay Min Yang Yeke ni Hong Wang Ligong Yao xuwen Li State Key Laboratory of Drug Research Shanghai Institute of Materia Medica Chinese Academy of Sciences College of Pharmaceutical Science Zhejiang University of Technology Laboratoire de Synthèse Organique UMR 7652 CNRS Ecole Polytechnique Université Paris-Saclay

Marine sponges of the genus Stelletta are well known as rich sources of diverse and complex biologically relevant natural products, including alkaloids, terpenoids, peptides, lipids, and steroids. Some of these metabolites, with novel structures and promising biological activities, have attracted a lot of attention from chemists seeking to perform their total synthesis in parallel to intensive biological studies towards new drug leads. In this review, we summarized the distribution of the chemically investigated Stelletta sponges, the isolation, synthesis and biological activities of their secondary metabolites, covering the literature from 1982 to early 2018.

关键词： Marine natural products Stelletta sponge Isolation Total synthesis Biological activity Marine drug leads

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[Retracted] Evaluation of Therapeutic Effect and Prognosis of Danzhi Xiaoyao Powder Combined with Photodynamic Therapy in the Treatment of Rose Acne

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Computational and Mathematical Methods in Medicine 2022年第1期2022卷

作者： Xinjian Yu ni Zhang Jing Jin xuwen Yin Jing Luo Hubei Provincial Hospital of Traditional Chinese Medicine Dermatological Department Attending Psychiatrist 430061 *** Hubei Provincial Hospital of Traditional Chinese Medicine Dermatological Department Supervising Technician 430061 ***

Background . Rose acne is a chronic inflammatory skin disease that can cause paroxysmal flushing, persistent erythema, papules or papules on the face, and pustules, and it has a greater impact on the life of patients, so it is important to treat it. Objective . To investigate the effect of Danzhi Xiaoyao Powder combined with photodynamic therapy (PDT) on the curative effect evaluation and prognosis of patients with rose acne. Patients and Methods . The clinical data of 110 rose acne patients who were treated in our hospital from January 2019 to January 2021 were selected as the subject of this retrospective study. They were divided into a control group and a treatment group according to the random residue grouping method. The new crown epidemic, loss to follow-up, etc. fell out of 5 cases in each group, and finally, 50 cases in each group were left. Among them, the control group was treated with PDT, and the treatment group was combined with Danzhi Xiaoyao Powder on the basis of the control group. Then we observe and compare the effects of skin lesion scores and clinical symptom scores and differences in clinical efficacy between the two groups. Results . The comparison of the clinical symptom scores of the two groups of patients before treatment was not statistically significant ( P > 0.05), while the burning score, tingling score, dryness score, and pruritus score of the treatment group after treatment were significantly different. The internal comparison after treatment was lower than before treatment, and the comparison between the treatment groups was significantly higher than the control group, which was statistically significant ( P < 0.05). There was no statistically significant difference in the skin lesion scores of the two groups before treatment ( P > 0.05), while the papules score, pustule score, erythema score, and telangiectasia score of the treatment group after treatment were significantly different and compared within the group. After treatment, th

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A 0.5mW 1Mb/s multi-channel chirp-UWB transmitter with burst-mode transmission and optimized digital gradient

A 0.5mW 1Mb/s multi-channel chirp-UWB transmitter with burst...

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2016 IEEE MTT-S International Wireless Symposium, IWS 2016

作者： ni, xuwen Zhang, Yining Rhee, Woogeun Jia, Wen Wang, Zhihua Institute of Microelectronics Tsinghua University Beijing China Research Institute of Tsinghua University in Shenzhen China

ISBN: (纸本)9781509006960

This paper presents a low power multi-channel chirp-UWB (C-UWB) transmitter for short range communication systems. The C-UWB transmitter generates a wideband FM signal with a steep spectral roll-off, while enabling a duty-cycled operation. To achieve an optimum duty-cycle control, burst-mode transmission and steep digital gradient generation techniques are employed. A 5-to-9GHz C-UWB transmitter is implemented in 65nm CMOS for multi-channel operation with a channel bandwidth of 500MHz. The transmitter achieves 1Mb/s data rate, consuming 0.5mW from a 1V supply. © 2016 IEEE.

关键词： Transmitters

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A 0.3mW 1Mb/s high security proximity UWB transmitter with frequency/time-domain scrambling

A 0.3mW 1Mb/s high security proximity UWB transmitter with f...

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IEEE International Workshop on Radio-Frequency Integration Technology (RFIT)

作者： xuwen ni Woogeun Rhee Zhihua Wang Institute of Microelectronics Tsinghua University Beijing China

This paper describes an ultra-wideband (UWB) transmitter architecture for secure proximity communication. The transmitter achieves high security by utilizing a pseudorandom scrambling method for both frequency hopping in frequency domain and pulse position modulation (PPM) in time domain. In addition, the low transmitted power of -70dBm/MHz not only makes it difficult for other receivers to detect the signal but also makes the transmission worldwide compliant with existing wireless standards. A prototype 3-4GHz proximity transmitter is implemented in 0.18μm CMOS. The transmitter achieves 1Mb/s data rate with 0.3mW power from a 1.8V supply.

关键词： Frequency modulation Radio transmitters Receivers Standards Security Communication system security

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A 1.8mW 2Mb/s chirp-UWB transceiver with burst-mode transmission and slope-based detection

A 1.8mW 2Mb/s chirp-UWB transceiver with burst-mode transmis...

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IEEE International Workshop on Radio-Frequency Integration Technology (RFIT)

作者： Yining Zhang xuwen ni Woogeun Rhee Zhihua Wang Institute of Microelectronics Tsinghua University Beijing China

关键词： Transceivers Receivers Frequency modulation Chirp Transmitters Demodulation Band-pass filters

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The complete chloroplast genome of the lipstick tree,Bixa Orellana(Bixaceae)

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Mitochondrial DNA Part B 2019年第1期4卷 17-18页

作者： Seping Dai xuwen Li Jianzhong ni Lin Ruan Renchao Zhou Wei Lun Ng Guangzhou Institute of Forestry and Landscape Architecture Guangzhou China State Key Laboratory of Biocontrol and Guangdong Provincial Key Laboratory of Plant Resources School of Life Science Sun Yat-sen University Guangzhou China

Bixa orellanais a small tree known for its red, oil-soluble pigment contained in the seed coat that is used as a natural dye and food coloring. In this study, we assembled and characterized the complete chloroplast genome ofB. orellanaas a resource for future genetic studies. With a total length of 159,825 bp, the chloroplast genome comprised of a large single-copy (LSC) region of 89,476 bp, a small single-copy (SSC) region of 19,617 bp, and two inverted repeat (IR) regions of 25,356 bp each. A total of 127 genes were predicted, consisting of 83 protein-coding genes, 36 tRNA genes, and 8 rRNA genes. Phylogenetic analysis confirmed the position ofB. orellanawithin the order Malvales.

关键词： Bixa achiote natural dye complete chloroplast genome automated assembly

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A 0.5mW 1Mb/s multi-channel chirp-UWB transmitter with burst-mode transmission and optimized digital gradient

A 0.5mW 1Mb/s multi-channel chirp-UWB transmitter with burst...

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IEEE International Wireless Symposium (IWS)

作者： xuwen ni Yining Zhang Woogeun Rhee Wen Jia Zhihua Wang Institute of Microelectronics Tsinghua University Beijing China Research Institute of Tsinghua University in Shenzhen China

ISBN: (纸本)9781509006977

关键词： Radio transmitters Chirp Transceivers Clocks Wideband Frequency modulation

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广州从化南平村风水林植物群落学特征及规划建议

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南方林业科学 2019年第1期47卷 49-54页

作者：李磊李许文倪建中代色平乳源瑶族自治县林业局广东乳源512700 广州市林业和园林科学研究院广东广州510405 广州市景观建筑重点实验室广东广州510405

采用现场全面踏查和样地调查相结合的方法,研究了广东省广州市从化区南平村风水林植物群落特征。在3个面积为400 m2的调查样方中,共记录植物134种(包括种下单位),隶属于77科114属。植物种类丰富,以大戟科、桑科、壳斗科和紫金牛科植物... 详细信息

采用现场全面踏查和样地调查相结合的方法,研究了广东省广州市从化区南平村风水林植物群落特征。在3个面积为400 m2的调查样方中,共记录植物134种(包括种下单位),隶属于77科114属。植物种类丰富,以大戟科、桑科、壳斗科和紫金牛科植物占优势。该群落具有南亚热带常绿阔叶林的典型群落结构,垂直结构分层明显,层次清晰。400 m2样地面积内,乔灌木群落的Shannon-Winner指数都在2.7以上,Simpson多样性指数在0.8以上,群落均匀度在2.0以上。该样地生物多样性的各项指标远远大于本地的一些风水林。研究成果对广州从化乡村绿化美化建设、风水林的保护、生态公益林造林、园林开发应用具有参考价值。

关键词：风水林树种组成群落结构物种丰富度规划建议广州

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