To design a Double-Pole Four-Throw (DP4T) RF switch, measurement of device parameters is required. In this DP4T RF switch CMOS is a unit cell, so with a thin oxide layer of thickness 628 ? which is measured optically....To design a Double-Pole Four-Throw (DP4T) RF switch, measurement of device parameters is required. In this DP4T RF switch CMOS is a unit cell, so with a thin oxide layer of thickness 628 ? which is measured optically. Some of the material parameters were found by the curve drawn between Capacitance versus Voltage (C-V) and Capacitance versus Frequency (C-F) with the application of Visual Engineering Environment Programming (VEE Pro). To perform the measurement processing at a distance, from the hazardous room, we use VEE Pro software. In this research, to acquire a fine result for RF MOSFET, we vary the voltage with minor increments and perform the measurements by vary the applying voltage from +5 V to –5 V and then back to +5 V again and then save this result in a data sheet with respect to temperature, voltage and frequency using this program. We have investigated the characteristics of RF MOSFET, which will be used for the wireless telecommunication systems.展开更多
With the increasing interest in radio frequency switch by using the CMOS circuit technology for the wireless communication systems is in demand. A traditional n-MOS Single-Pole Double-Throw (SPDT) switch has good perf...With the increasing interest in radio frequency switch by using the CMOS circuit technology for the wireless communication systems is in demand. A traditional n-MOS Single-Pole Double-Throw (SPDT) switch has good performances but only for a single operating frequency. For multiple operating frequencies, to transmitting or receiving information through the multiple antennas systems, known as MIMO systems, it a new RF switch is required which should be capable of operating with multiple antennas and frequencies as well as minimizing signal distortions and power consumption. We already have proposed a Double-Pole Four-Throw (DP4T) RF switch and in this research article we are discussing a process for the characterization of the MOSFET with Virtual Instrumentation. The procedure to characterize oxide and conductor layers that are grown or deposited on semiconductors is by studying the characteristics of a MOS capacitor that is formed of the conductor (Metal)-insulator-semiconductor layers for the purpose of RF CMOS as a switch is presented. For a capacitor formed of Metal-silicon dioxide-silicon layers with a thick oxide measured opti-cally. Some of the calculated material parameters are away from the expected values. These errors might be due to several factors such as a possible offset capacitance of the probes due to improper contact with the wafer which is measured by using the LCR (Inductance-Capacitance-Resistance) meter with the help of Visual Engineering Environment Programming (VEE Pro, a Agilent product).展开更多
(±)-Penicithrones A–D(1a/1b–4a/4b),four novel pairs of anthrone–cyclopentenone heterodimers characterized by a distinctive bridged 6/6/6−5 tetracyclic core skeleton,together with three previously identified co...(±)-Penicithrones A–D(1a/1b–4a/4b),four novel pairs of anthrone–cyclopentenone heterodimers characterized by a distinctive bridged 6/6/6−5 tetracyclic core skeleton,together with three previously identified compounds(5–7),were isolated from the crude extract of the mangrove-derived fungus Penicillium sp.,guided by heteronuclear single quantum correlation(HSQC)-based small molecule accurate recognition technology(SMART 2.0)and liquid chromatography-tandem mass spectrometry(LC-MS/MS)-based molecular networking.The structural elucidation of new compounds was accomplished through comprehensive spectroscopic analysis,and their absolute configurations were determined using DP4+^(13)C nuclear magnetic resonance(NMR)calculations and electronic circular dichroism(ECD)calculations.Compounds 1a/1b–4a/4b demonstrated moderate cytotoxicity against three human cancer cell lines HeLa,HCT116 and MCF-7 with half maximal inhibitory concentration(IC50)values ranging from 15.95±1.64 to 28.56±2.59μmol·L–1.展开更多
在过去的十多年中,伴随着量子化学理论与计算机硬件、软件的不断发展,量子化学计算核磁共振参数(quantum chemical calculation of nuclear magnetic resonance parameters,qcc-NMR)的方法也日趋成熟,这些方法往往在较小的计算成本下就...在过去的十多年中,伴随着量子化学理论与计算机硬件、软件的不断发展,量子化学计算核磁共振参数(quantum chemical calculation of nuclear magnetic resonance parameters,qcc-NMR)的方法也日趋成熟,这些方法往往在较小的计算成本下就可以获得比较理想的计算精度,且对于NMR参数计算结果的分析也从最初的简单统计学方法逐渐发展为基于更为复杂的统计学原理或人工神经网络的方法,这些进展都促使qcc-NMR这一工具在天然产物研究中得到了越来越广泛的应用,从而对传统的NMR技术、质谱,以及各种光谱技术做出了重要补充.本文对qcc-NMR在天然产物结构鉴定中的应用进行了综述,并对近年来的一些应用实例进行了较为详细的分析.展开更多
Callica rpabodinieri is a Chinese traditional medicine herb with anti-inflammatory activity in clinic.Herein,we report two new 9,10-seco and etherified abietane diterpenoids bodinieric acids J and K(1 and 2) and one k...Callica rpabodinieri is a Chinese traditional medicine herb with anti-inflammatory activity in clinic.Herein,we report two new 9,10-seco and etherified abietane diterpenoids bodinieric acids J and K(1 and 2) and one known compound(3) isolated from the leaves and twigs of this plant.Their chemical structures were elucidated by detailed spectrometry data analysis and DP4+NMR calculation methods.Hypothetical biosynthetic pathways of 1-3 were preliminarily speculated.Compound 3 inhibited inflammasome activation and exhibited blockage of NLRP3 inflammasome activation at non-cytotoxic concentrations in vitro.展开更多
Four highly oxidized pimarane diterpenoids were isolated from Kaempferia takensis rhizomes.Kaemtakols A-C pos-sess a tetracyclic ring with either a fused tetrahydropyran or tetrahydrofuran motif.Kaemtakol D has an unu...Four highly oxidized pimarane diterpenoids were isolated from Kaempferia takensis rhizomes.Kaemtakols A-C pos-sess a tetracyclic ring with either a fused tetrahydropyran or tetrahydrofuran motif.Kaemtakol D has an unusual rearranged A/B ring spiro-bridged pimarane framework with a C-10 spirocyclic junction and an adjacent 1-methyltri-cyclo[3.2.1.02,7]octene ring.Structural characterization was achieved using spectroscopic analysis,DP4+and ECD calculations,as well as X-ray crystallography,and their putative biosynthetic pathways have been proposed.Kaemtakol B showed significant potency in inhibiting nitric oxide production with an IC50 value of 0.69μM.Molecular docking provided some perspectives on the action of kaemtakol B on iNOS protein.展开更多
In this paper, we have analyzed the Double-Pole Four-Throw Double-Gate Radio-Frequency Complementary Metal-Oxide-Semiconductor (DP4T DG RF CMOS) switch using S-parameters for 1 GHz to 60 GHz of frequency range. DP4T D...In this paper, we have analyzed the Double-Pole Four-Throw Double-Gate Radio-Frequency Complementary Metal-Oxide-Semiconductor (DP4T DG RF CMOS) switch using S-parameters for 1 GHz to 60 GHz of frequency range. DP4T DG RF CMOS switch for operation at high frequency is also analyzed with its capacitive model. The re-sults for the development of this proposed switch include the basics of the circuit elements in terms of capacitance, re-sistance, impedance, admittance, series equivalent and parallel equivalent of this network at different frequencies which are present in this switch whatever they are ON or OFF.展开更多
In this paper, we have investigated the design parameters of RF CMOS switch, which will be used for the wireless tele-communication systems. A double-pole four-throw double-gate radio-frequency complementary-metal-oxi...In this paper, we have investigated the design parameters of RF CMOS switch, which will be used for the wireless tele-communication systems. A double-pole four-throw double-gate radio-frequency complementary-metal-oxide-semicon- ductor (DP4T DG RF CMOS) switch for operating at the 1 GHz is implemented with 45-nm CMOS process technology. This proposed RF switch is capable to select the data streams from the two antennas for both the transmitting and receiving processes. For the development of this DP4T DG RF CMOS switch we have explored the basic concept of the proposed switch circuit elements required for the radio frequency systems such as drain current, threshold voltage, resonant frequency, return loss, transmission loss, VSWR, resistances, capacitances, and switching speed.展开更多
In this paper, we have investigated the design parameters of RF CMOS cells which will be used for switch in the wireless telecommunication systems. This RF switch is capable to select the data streams from the two ant...In this paper, we have investigated the design parameters of RF CMOS cells which will be used for switch in the wireless telecommunication systems. This RF switch is capable to select the data streams from the two antennas for both the transmitting and receiving processes. The results for the development of a cell-library which includes the basics of the circuit elements required for the radio frequency sub-systems of the integrated circuits such as V-I characteristics at low-voltages, contact resistance which is present in the switches and the potential barrier with contacts available in devices has been discussed.展开更多
文摘To design a Double-Pole Four-Throw (DP4T) RF switch, measurement of device parameters is required. In this DP4T RF switch CMOS is a unit cell, so with a thin oxide layer of thickness 628 ? which is measured optically. Some of the material parameters were found by the curve drawn between Capacitance versus Voltage (C-V) and Capacitance versus Frequency (C-F) with the application of Visual Engineering Environment Programming (VEE Pro). To perform the measurement processing at a distance, from the hazardous room, we use VEE Pro software. In this research, to acquire a fine result for RF MOSFET, we vary the voltage with minor increments and perform the measurements by vary the applying voltage from +5 V to –5 V and then back to +5 V again and then save this result in a data sheet with respect to temperature, voltage and frequency using this program. We have investigated the characteristics of RF MOSFET, which will be used for the wireless telecommunication systems.
文摘With the increasing interest in radio frequency switch by using the CMOS circuit technology for the wireless communication systems is in demand. A traditional n-MOS Single-Pole Double-Throw (SPDT) switch has good performances but only for a single operating frequency. For multiple operating frequencies, to transmitting or receiving information through the multiple antennas systems, known as MIMO systems, it a new RF switch is required which should be capable of operating with multiple antennas and frequencies as well as minimizing signal distortions and power consumption. We already have proposed a Double-Pole Four-Throw (DP4T) RF switch and in this research article we are discussing a process for the characterization of the MOSFET with Virtual Instrumentation. The procedure to characterize oxide and conductor layers that are grown or deposited on semiconductors is by studying the characteristics of a MOS capacitor that is formed of the conductor (Metal)-insulator-semiconductor layers for the purpose of RF CMOS as a switch is presented. For a capacitor formed of Metal-silicon dioxide-silicon layers with a thick oxide measured opti-cally. Some of the calculated material parameters are away from the expected values. These errors might be due to several factors such as a possible offset capacitance of the probes due to improper contact with the wafer which is measured by using the LCR (Inductance-Capacitance-Resistance) meter with the help of Visual Engineering Environment Programming (VEE Pro, a Agilent product).
基金supported by the National Key Research and Development Program of China(No.2022YFC2303100)the National Natural Science Foundation of China(Nos.32022002 and 21977113).
文摘(±)-Penicithrones A–D(1a/1b–4a/4b),four novel pairs of anthrone–cyclopentenone heterodimers characterized by a distinctive bridged 6/6/6−5 tetracyclic core skeleton,together with three previously identified compounds(5–7),were isolated from the crude extract of the mangrove-derived fungus Penicillium sp.,guided by heteronuclear single quantum correlation(HSQC)-based small molecule accurate recognition technology(SMART 2.0)and liquid chromatography-tandem mass spectrometry(LC-MS/MS)-based molecular networking.The structural elucidation of new compounds was accomplished through comprehensive spectroscopic analysis,and their absolute configurations were determined using DP4+^(13)C nuclear magnetic resonance(NMR)calculations and electronic circular dichroism(ECD)calculations.Compounds 1a/1b–4a/4b demonstrated moderate cytotoxicity against three human cancer cell lines HeLa,HCT116 and MCF-7 with half maximal inhibitory concentration(IC50)values ranging from 15.95±1.64 to 28.56±2.59μmol·L–1.
文摘在过去的十多年中,伴随着量子化学理论与计算机硬件、软件的不断发展,量子化学计算核磁共振参数(quantum chemical calculation of nuclear magnetic resonance parameters,qcc-NMR)的方法也日趋成熟,这些方法往往在较小的计算成本下就可以获得比较理想的计算精度,且对于NMR参数计算结果的分析也从最初的简单统计学方法逐渐发展为基于更为复杂的统计学原理或人工神经网络的方法,这些进展都促使qcc-NMR这一工具在天然产物研究中得到了越来越广泛的应用,从而对传统的NMR技术、质谱,以及各种光谱技术做出了重要补充.本文对qcc-NMR在天然产物结构鉴定中的应用进行了综述,并对近年来的一些应用实例进行了较为详细的分析.
基金financially supported by the National Natural Science Foundation of China(Nos.81422046 and 21762048)the Yunnan Applicative and Basic Research Program(Nos.2015BC002,2018FY001 and 2018FA048)+4 种基金the Program for Changjiang Scholars and Innovative Research Team in University(No.IRT_17R94)the Key Program of Natural Science of Yunnan Province to W.L.Xiaothe Key Laboratory of Medicinal Chemistry for Natural Resource,Ministry of Education(No.2017KF02)the Natural Science Foundation of Yunnan University(No.2017YDQN03)the Foundation of Yunnan Educational Committee(No.2018JS002)。
文摘Callica rpabodinieri is a Chinese traditional medicine herb with anti-inflammatory activity in clinic.Herein,we report two new 9,10-seco and etherified abietane diterpenoids bodinieric acids J and K(1 and 2) and one known compound(3) isolated from the leaves and twigs of this plant.Their chemical structures were elucidated by detailed spectrometry data analysis and DP4+NMR calculation methods.Hypothetical biosynthetic pathways of 1-3 were preliminarily speculated.Compound 3 inhibited inflammasome activation and exhibited blockage of NLRP3 inflammasome activation at non-cytotoxic concentrations in vitro.
基金the Thailand Science Research and Innovation(TSRI),Chulabhorn Research Institute(Grant No.36824/4274394 and 36827/4274406)the Center of Excellence on Environmental Health and Toxicology(EHT),OPS,Ministry of Higher Education,Science,Research and Innovation.
文摘Four highly oxidized pimarane diterpenoids were isolated from Kaempferia takensis rhizomes.Kaemtakols A-C pos-sess a tetracyclic ring with either a fused tetrahydropyran or tetrahydrofuran motif.Kaemtakol D has an unusual rearranged A/B ring spiro-bridged pimarane framework with a C-10 spirocyclic junction and an adjacent 1-methyltri-cyclo[3.2.1.02,7]octene ring.Structural characterization was achieved using spectroscopic analysis,DP4+and ECD calculations,as well as X-ray crystallography,and their putative biosynthetic pathways have been proposed.Kaemtakol B showed significant potency in inhibiting nitric oxide production with an IC50 value of 0.69μM.Molecular docking provided some perspectives on the action of kaemtakol B on iNOS protein.
文摘In this paper, we have analyzed the Double-Pole Four-Throw Double-Gate Radio-Frequency Complementary Metal-Oxide-Semiconductor (DP4T DG RF CMOS) switch using S-parameters for 1 GHz to 60 GHz of frequency range. DP4T DG RF CMOS switch for operation at high frequency is also analyzed with its capacitive model. The re-sults for the development of this proposed switch include the basics of the circuit elements in terms of capacitance, re-sistance, impedance, admittance, series equivalent and parallel equivalent of this network at different frequencies which are present in this switch whatever they are ON or OFF.
文摘In this paper, we have investigated the design parameters of RF CMOS switch, which will be used for the wireless tele-communication systems. A double-pole four-throw double-gate radio-frequency complementary-metal-oxide-semicon- ductor (DP4T DG RF CMOS) switch for operating at the 1 GHz is implemented with 45-nm CMOS process technology. This proposed RF switch is capable to select the data streams from the two antennas for both the transmitting and receiving processes. For the development of this DP4T DG RF CMOS switch we have explored the basic concept of the proposed switch circuit elements required for the radio frequency systems such as drain current, threshold voltage, resonant frequency, return loss, transmission loss, VSWR, resistances, capacitances, and switching speed.
文摘In this paper, we have investigated the design parameters of RF CMOS cells which will be used for switch in the wireless telecommunication systems. This RF switch is capable to select the data streams from the two antennas for both the transmitting and receiving processes. The results for the development of a cell-library which includes the basics of the circuit elements required for the radio frequency sub-systems of the integrated circuits such as V-I characteristics at low-voltages, contact resistance which is present in the switches and the potential barrier with contacts available in devices has been discussed.
