量子水印以量子图像为载体,能够实现秘密信息的安全传输。本文基于新型增强量子图像表示模型(Novel Enhanced Quantum Representation of Digital Images,NEQR)提出了一种高容量的量子水印协议,该协议将大小为2^(n)×2^(n)的载体图...量子水印以量子图像为载体,能够实现秘密信息的安全传输。本文基于新型增强量子图像表示模型(Novel Enhanced Quantum Representation of Digital Images,NEQR)提出了一种高容量的量子水印协议,该协议将大小为2^(n)×2^(n)的载体图像分割成2^(2n-2)个不重叠的像素块,该像素块中的像素点两两进行灰度值差值计算,依据所得差值对像素块进行分类,并对不同类别的像素块设置标志位。协议在水印嵌入前,需将2^(n-1)×2^(n-1)大小的水印图像扩大4倍,然后将扩大后的水印依据标志位的不同嵌入不同的载体图像最低有效位(Least Significant Bit,LSB)中。本文给出了协议实现的量子线路,合法的接收方将提取水印的量子线路作用于嵌入水印的载体图像即可获取水印信息。同时,本文在量子计算仿真环境下对协议进行了仿真实验,仿真结果说明协议具有良好的不可见性,嵌入容量较好。展开更多
目的预测瞿麦中主要活性成分及其作用靶点,探讨瞿麦多成分-多靶点-多通路的药理作用机制。方法从TCMSP、Superpred、CTD、David等网站富集主要活性成分、靶点、疾病及通路,进而发现其中的相互作用规律。结果得到21个主要活性成分,包括...目的预测瞿麦中主要活性成分及其作用靶点,探讨瞿麦多成分-多靶点-多通路的药理作用机制。方法从TCMSP、Superpred、CTD、David等网站富集主要活性成分、靶点、疾病及通路,进而发现其中的相互作用规律。结果得到21个主要活性成分,包括大黄素、积雪草酸等;主要作用于TP53等204个核心靶点;这些成分可治疗乳腺肿瘤等相关疾病365种,这些疾病分别属于癌症等33大类疾病并可作用于Pathways in cancer等30条通路。通过以上过程发现瞿麦中主要活性成分治疗癌症等疾病的作用是通过'多成分-多靶点-多通路'来发挥疗效的。结论本实验预测了瞿麦中主要活性成分及其作用靶点、通路等的相互作用规律,为进一步探讨瞿麦药理作用机制提供科学依据和理论基础。展开更多
Recently,hybrid energy harvester has been considered as an attractive potential approach to response the worldwide energy crisis due to the combination of advantages from different harvesting mechanism.In this paper,a...Recently,hybrid energy harvester has been considered as an attractive potential approach to response the worldwide energy crisis due to the combination of advantages from different harvesting mechanism.In this paper,a novel low-frequency wide-band hybrid energy harvester based on piezoelectric and triboelectric mechanism is presented and systematically studied including structural design,fabrication process,working principle simulation and measurement.With a vibrational excitation,the polyvinylidene fluoride(PVDF) cantilevers will vibrate and impact the polydimethylsiloxane(PDMS) film on the substrate,producing a piezoelectric output as well as a triboelectric output.The structural parameters of each cantilever are optimized using finite element simulation,and the well-designed PVDF cantilevers with controllable PDMS mass not only reduce the device working frequency but also enlarge the bandwidth.Under a sweep-frequency test,three voltage peaks induced by the piezoelectric part are observed at 15,32.5 and 47.5 Hz,with the value of 320,288 and 264 mV,respectively.With the combined triboelectric part,a 20 V peak-peak voltage is generated at 15 Hz.The electrical driving ability of this hybrid energy harvester also has been demonstrated by lighting up a commercial light emitting diode(LED).展开更多
In this paper,a piezoelectric energy harvester based on spiral-shaped polyvinylidene fluoride(PVDF)cantilever is designed and fabricated for harvesting low frequency vibration energy in the environment.In this design,...In this paper,a piezoelectric energy harvester based on spiral-shaped polyvinylidene fluoride(PVDF)cantilever is designed and fabricated for harvesting low frequency vibration energy in the environment.In this design,the spiral-shaped PVDF cantilever is major for lowering the resonant frequency by increasing the length of the cantilever;Copper and silicon proof masses on both sides are working on further decreasing the resonant frequency and widen its bandwidth.Due to the high flexibility of the PVDF cantilever,this device is extremely sensitive to vibration and can harvest weak vibration energy.Both simulation and experimental results have approved that this device can operate at very low frequency which is about 20 Hz and can effectively harvest energy from 15–50 Hz.The peak of the output voltage can reach 1.8 V with the acceleration of 0.2 g.This is a promising harvester for powering the wireless sensors in the future.展开更多
Recently, triboelectric generator(TEG) has attracted a lot of attention due to its high output voltage and low-cost fabrication process. Here, a novel cubic TEG box is designed, which has separated electrodes on diffe...Recently, triboelectric generator(TEG) has attracted a lot of attention due to its high output voltage and low-cost fabrication process. Here, a novel cubic TEG box is designed, which has separated electrodes on different surfaces. Thanks to the specially designed structure, it can scavenge vibration energy from all directions. Firstly the device is investigated through finite element method(FEM) simulation. Then the device is evaluated by experiments. The measuremental results show that this device can generate an amount of 25 n C charge during once shake by charging a 10 n F capacitor. Besides, an output voltage about 100 V is obtained, which is able to directly light up several light-emitting diodes(LEDs) simultaneously. At last, the device is utilized as a self-powered orientation sensor, which shows explicit directivity. This work extends the applications of TEG for ambient vibration energy harvesting techniques and the self-powered orientation sensor.展开更多
A novel arc-shaped piezoelectric generator based on flexible PVDF thin film is presented and systemically studied.With a periodical external force,the generator can produce peak voltage of 45.6 V and peak power of 30....A novel arc-shaped piezoelectric generator based on flexible PVDF thin film is presented and systemically studied.With a periodical external force,the generator can produce peak voltage of 45.6 V and peak power of 30.7μW.The maximum power density reaches 38.4μW/cm3with a 4 cm×2 cm×100μm device,at the optimum load resistance of 33.33 MOhm.The influence of frequency,size dimension and load resistance are investigated through experimental measurements.With this high output arc-shaped generator,capacitors can be effectively charged and three commercial LEDs have been directly lighted without any energy storage unit.展开更多
文摘量子水印以量子图像为载体,能够实现秘密信息的安全传输。本文基于新型增强量子图像表示模型(Novel Enhanced Quantum Representation of Digital Images,NEQR)提出了一种高容量的量子水印协议,该协议将大小为2^(n)×2^(n)的载体图像分割成2^(2n-2)个不重叠的像素块,该像素块中的像素点两两进行灰度值差值计算,依据所得差值对像素块进行分类,并对不同类别的像素块设置标志位。协议在水印嵌入前,需将2^(n-1)×2^(n-1)大小的水印图像扩大4倍,然后将扩大后的水印依据标志位的不同嵌入不同的载体图像最低有效位(Least Significant Bit,LSB)中。本文给出了协议实现的量子线路,合法的接收方将提取水印的量子线路作用于嵌入水印的载体图像即可获取水印信息。同时,本文在量子计算仿真环境下对协议进行了仿真实验,仿真结果说明协议具有良好的不可见性,嵌入容量较好。
文摘目的预测瞿麦中主要活性成分及其作用靶点,探讨瞿麦多成分-多靶点-多通路的药理作用机制。方法从TCMSP、Superpred、CTD、David等网站富集主要活性成分、靶点、疾病及通路,进而发现其中的相互作用规律。结果得到21个主要活性成分,包括大黄素、积雪草酸等;主要作用于TP53等204个核心靶点;这些成分可治疗乳腺肿瘤等相关疾病365种,这些疾病分别属于癌症等33大类疾病并可作用于Pathways in cancer等30条通路。通过以上过程发现瞿麦中主要活性成分治疗癌症等疾病的作用是通过'多成分-多靶点-多通路'来发挥疗效的。结论本实验预测了瞿麦中主要活性成分及其作用靶点、通路等的相互作用规律,为进一步探讨瞿麦药理作用机制提供科学依据和理论基础。
基金supported by the National Natural Science Foundation of China (Grant Nos. 61176103,91023045)the National HiTech Research and Development Program of China ("863" Project) (Grant No.2013AA041102)+1 种基金the National Ph. D. Foundation Project (Grant No.20110001110103)the Global Research Outreach Program of Samsung Advanced Institute of Technology
文摘Recently,hybrid energy harvester has been considered as an attractive potential approach to response the worldwide energy crisis due to the combination of advantages from different harvesting mechanism.In this paper,a novel low-frequency wide-band hybrid energy harvester based on piezoelectric and triboelectric mechanism is presented and systematically studied including structural design,fabrication process,working principle simulation and measurement.With a vibrational excitation,the polyvinylidene fluoride(PVDF) cantilevers will vibrate and impact the polydimethylsiloxane(PDMS) film on the substrate,producing a piezoelectric output as well as a triboelectric output.The structural parameters of each cantilever are optimized using finite element simulation,and the well-designed PVDF cantilevers with controllable PDMS mass not only reduce the device working frequency but also enlarge the bandwidth.Under a sweep-frequency test,three voltage peaks induced by the piezoelectric part are observed at 15,32.5 and 47.5 Hz,with the value of 320,288 and 264 mV,respectively.With the combined triboelectric part,a 20 V peak-peak voltage is generated at 15 Hz.The electrical driving ability of this hybrid energy harvester also has been demonstrated by lighting up a commercial light emitting diode(LED).
基金supported by the National Natural Science Foundation of China(Grant Nos.61176103,91023045 and 91323304)National Ph.D.Foundation Project(Grant No.20110001110103)Global Research Outreach Program of Samsung Advanced Institute of Technology
文摘In this paper,a piezoelectric energy harvester based on spiral-shaped polyvinylidene fluoride(PVDF)cantilever is designed and fabricated for harvesting low frequency vibration energy in the environment.In this design,the spiral-shaped PVDF cantilever is major for lowering the resonant frequency by increasing the length of the cantilever;Copper and silicon proof masses on both sides are working on further decreasing the resonant frequency and widen its bandwidth.Due to the high flexibility of the PVDF cantilever,this device is extremely sensitive to vibration and can harvest weak vibration energy.Both simulation and experimental results have approved that this device can operate at very low frequency which is about 20 Hz and can effectively harvest energy from 15–50 Hz.The peak of the output voltage can reach 1.8 V with the acceleration of 0.2 g.This is a promising harvester for powering the wireless sensors in the future.
基金supported by the National Natural Science Foundation of China(Grant Nos.61176103,91323304)the National High-Tech Research and Development Program of China("863"Project)(Grant No.2013AA041102)the Beijing Natural Science Foundation of China(Grant No.4141002)
文摘Recently, triboelectric generator(TEG) has attracted a lot of attention due to its high output voltage and low-cost fabrication process. Here, a novel cubic TEG box is designed, which has separated electrodes on different surfaces. Thanks to the specially designed structure, it can scavenge vibration energy from all directions. Firstly the device is investigated through finite element method(FEM) simulation. Then the device is evaluated by experiments. The measuremental results show that this device can generate an amount of 25 n C charge during once shake by charging a 10 n F capacitor. Besides, an output voltage about 100 V is obtained, which is able to directly light up several light-emitting diodes(LEDs) simultaneously. At last, the device is utilized as a self-powered orientation sensor, which shows explicit directivity. This work extends the applications of TEG for ambient vibration energy harvesting techniques and the self-powered orientation sensor.
基金supported by the National Natural Science Foundation of China(Grant Nos.61176103,91023045)the National Hi-Tech Research and Development Program("863" Project)(Grant No.2013AA041102)the National Ph.D.Foundation Project(Grant No.20110001110103)
文摘A novel arc-shaped piezoelectric generator based on flexible PVDF thin film is presented and systemically studied.With a periodical external force,the generator can produce peak voltage of 45.6 V and peak power of 30.7μW.The maximum power density reaches 38.4μW/cm3with a 4 cm×2 cm×100μm device,at the optimum load resistance of 33.33 MOhm.The influence of frequency,size dimension and load resistance are investigated through experimental measurements.With this high output arc-shaped generator,capacitors can be effectively charged and three commercial LEDs have been directly lighted without any energy storage unit.
