Sichuan Sunfor Light Co., Ltd

Chinese Academy of Sciences

Southwest Petroleum University

Jiangsu Huifeng Bio Agriculture Co., Ltd.

Zhonghao Chenguang Research Institute of Chemical Industry

Ming Zhang

Kun Zhao

Hongjie Zhang

Chengyu Li

Dong-ming Li

Hao Kai Zhang

Li Zhang

Dongming Li

Martin Alsina Navarro

Andre Luiz Moreno

Sen Wang

Ying Wang

Hao Zhang

Wentao Long

Mian Yang

Zhengyong Feng

Xiong Yu

Hangen Zhong

Hongjin Ji

Qiang Zhang

Yong Guo

Yuanhua Lin

Kuanhai Deng

Yang Peng

Xueguang Lu

Xianquan Hu

Rong Bai

Jianfeng Wei

Xiaolei Zhang

Niantao Zhou

Mingyuan Yao

Pengfei Xie

Deqiang Yi

Jianxin Zhang

Yi Zhou

Lijuan Luo

Guohua Ye

Xiaobo Si

Yaoqiang Wang

Haoning Liang

Xueduan Xie

Jingang Zhang

Bo Chen

Xucang Yang

Jun Qu

Yu Cheng

Ying Xu

Wenzheng Luo

A quantitative evaluation method for integrity and damage evolution of a cement sheath in an oil-gas well is provided based on a fractal theory, an image processing technology, structural features and failure mechanisms of a casing-cement sheath-formation combination. The method uses correlations among fractal dimensions of casing-cement sheath interface morphology, cement sheath microscopic pore morphology, particle morphology of an initial blank group, and macroscopic mechanical properties including a radial cementing strength of the cement sheath interface, a tensile strength, and a compressive strength to quantitatively evaluate the integrity of the cement sheath of the blank group. The method further uses correlations among fractal dimensions of the casing-cement sheath interface morphology, cement sheath microscopic pore morphology, particle morphology, crack morphology after an alternating load, and the macroscopic mechanical properties of the cement sheath to quantitatively evaluate a regularity of the damage evolution of the cement sheath of a conditional control group.

Quantitative evaluation method for integrity and damage evolution of cement sheath in oil-gas well

A pesticide composition, preparation method and use thereof; the composition having a synergism effect, including effective components A and B, wherein the active component A is thidiazuron, the active component B is polyglutamic acid, and the weight ratio of the component A to the component B is 1:(0.01-200).

Pesticide composition containing thidiazuron and polyglutamic acid

The present invention relates to an oxynitride luminescent material, a preparation method, and an LED light source manufactured thereby. Chemical compositions of the luminescent material are M1 a M2 b Si c O d N e:xEu 2+, M1 being one or two or a combination of more than two of elements: Mg, Ca, Sr, Ba, and Zn; M2 being one or a combination of two of elements: Tb and Tm; a, b, c, d, e and x being molar coefficients of atoms, and 1&#x2266;a&#x2266;4, 0.001&#x2266;b&#x2266;0.6, 0.8&#x2266;c&#x2266;1.2, 0&#x3c;d&#x2266;6, 0&#x3c;e&#x3c;2, 0.001&#x2266;x&#x2266;0.3. An excitation spectrum of the luminescent material is wide, and covers ultraviolet light to blue light regions, emitted light is green light to orange red light, and the chemical stability is good, the thermostability is high, and the luminescent material is suitable for being encapsulated into an LED light source in cooperation with an ultraviolet light, near ultraviolet light or blue light LED chip.

Oxynitride luminescent material, preparation method, LED light source manufactured thereby

The present invention provides a light-emitting diode (LED) device and a method for manufacturing the same. The LED device comprises: a substrate (); a chip () disposed on the substrate (); and a first lens () disposed on the substrate () and spaced from the chip (); wherein the first lens () comprises luminescent powder () and at least one of light-diffusing particles () and light-reflecting particles (). The LED device provided by the present invention has a high luminous efficiency, and solves the problem in the prior art that the LED device has a small angle of emergence and the emergent light emergence lacks of uniformity.

LED device and preparation method thereof

The invention relates to a yellow light afterglow material and a preparation method thereof as well as an LED illuminating device using the same. The yellow light afterglow material comprises the chemical formula of aYO.bAlO.cSiO:mCe.nB.xNa.yP, where a, b, c, m, n, x and y are coefficients, and a is not less than 1 but not more than 2, b is not less than 2 but not more than 3, c is not less than 0.001 but not more than 1, m is not less than 0.0001 but not more than 0.6, n is not less than 0.0001 but not more than 0.5, x is not less than 0.0001 but not more than 0.2, and y is not less than 0.0001 but not more than 0.5; wherein Y, Al and Si are substrate elements, and Ce, B, Na and P are activators. The yellow light afterglow material is prepared by the following steps: weighing oxides of elements or materials which can generate oxides at high temperature by molar ratio as raw materials, evenly mixing and then sintering the raw materials at 1200-1700&#xb0; in a reducing atmosphere.

Yellow light afterglow material and preparation method thereof as well as LED illuminating device using same

The present invention discloses a white LED light emitting device driven directly by constant current in manner of being supplied with alternating current. N parallel branches, consisting of LED modules and constant current units which are in series connection with the LED modules, are connected to an output terminal of a rectification circuit, and by setting the current value, the turning-off voltage, and the turning-on voltage of the constant current unit of each branch, the periodic flickers generated due to changes in the voltage of the alternating current can be avoided. Because the current of each branch is constant, the changes in junction temperatures do not result in the current changing in LED, and the reliability is improved. Along with the increase of the number of the branches, the driving current waveform approximates a sine wave, and the power factor and the efficiency of the light emitting device are improved.

White LED light emitting device driven directly by constant alternating current

An Alternate Current (AC) white Light-Emitting Diode (LED) device is provided, which belongs to the technical field of white LED manufacturing. The problem to be solved by the present invention is to low-costly overcome a series of deficiencies such as the stroboflash of an AC driven LED, and the heat dissipation difficulty caused by an integrated packaging of multiple LEDs. A white LED unit includes an LED chip and a light emitting material that can emit light when being excited by the LED chip. The luminous lifetime of the light emitting material is 1-100 ms. The LED chip only comprises one PN junction. The light emitted by the LED chip is mixed with the light emitted by the light emitting material to form white light. The white LED unit is driven by AC with a frequency not more than 100 Hz. The white LED device of prevent invention uses the single PN junction chip, rather than the prior integrated packaged AC multi-LED chip.

White LED device having LED chips directly driven by alternating current

A white LED lighting device driven by a pulse current is provided, which consists of blue, violet or ultraviolet LED chips, blue afterglow luminescence materials A and yellow luminescence materials B. Wherein the weight ratio of the blue afterglow luminescence materials A to the yellow luminescence materials B is 10-70 wt %:30-90 wt %. The white LED lighting device drives the LED chips with a pulse current having a frequency of not less than 50 Hz. Because of using the afterglow luminescence materials, the light can be sustained when an excitation light source disappears, thereby eliminating the influence of LED light output fluctuation caused by current variation on the illumination. At the same time, the pulse current can keep the LED chips being at an intermittent work state, so as to overcome the problem of chip heating.

White light emitting diode (LED) lighting device driven by pulse current

A white LED lighting device driven by a pulse current is provided, which consists of blue, violet or ultraviolet LED chips, blue afterglow luminescence materials A and yellow luminescence materials B. Wherein the weight ratio of the blue afterglow luminescence materials A to the yellow luminescence materials B is 10-70 wt %: 30-90 wt %. The white LED lighting device drives the LED chips with a pulse current having a frequency of not less than 50 Hz. Because of using the afterglow luminescence materials, the light can be sustained when an excitation light source disappears, thereby eliminating the influence of LED light output fluctuation caused by current variation on the illumination. At the same time, the pulse current can keep the LED chips being at an intermittent work state, so as to overcome the problem of chip heating.

An alternating current (AC) white LED lighting device and a method for manufacturing the same are provided. The AC white LED lighting device consists of blue, violet or ultraviolet LED chips, blue afterglow luminescence materials A and yellow luminescence materials B. Wherein the weight ratio of the blue afterglow luminescence materials A to the yellow luminescence materials B is 10-70 wt %:30-90 wt %. Because of using afterglow luminescence materials, the light will be sustained when an excitation light source disappears, which can eliminate the influence of LED chips light output variation due to the AC fluctuation on the lighting device. And the problem of the heating of the chips also can be overcome. At the same time, the influence of temperature quenching effect and direction change of the AC current on the AC white LED lighting device is eliminated.

White light emitting diode (LED) lighting device

Growing community of inventors

Sichuan, China

Ming Zhang