简易测高望远两用仪

太阳测高仪是学生练习测太阳高度使用的仪器,而望远镜则是为丰富学生课外活动而设计的,我们将太阳测高仪和望远镜合为一体,是为了使用方便,充分利用材料,做到一物两用,也扩展了测高仪的用途。 1、制作材料 底座和立柱(可以用木材或其他材科)、镜筒 (可以用纸筒、塑料管等)、量角器(90°)一个、粗铝丝10厘米左右、薄铁皮、螺钉四个、牙膏帽四个。凸透镜和凹透镜各一个。

太阳高度与物体影长两用仪

一、制作材料 材料名称 规格 数量 木板 20mm厚,200×200mm^2 1 10mm厚,1045×40mm^2 1 10mm厚,100×40mm^2 1 10mm厚,50×40mm^2 1 10mm厚,500×25mm^2

调压、充电、逆变三用仪的制作

调压、充电逆变三用仪在有市电时对电瓶充电;在停电时由电瓶逆变成220V交流电供家电使用;并能在电网电压过高或过低时通过手动将输出电压调节至220V,保证用电器使用安全。三用仪电路如图所示,图中开关K1K2拨至A向时,为逆变状态,左半部电路组成自激振荡器,产生约50Hz的方波,经变压器升压后由K3调至220V输出。K1、K2搬至B向时为充电状态,这时K1切断振荡管的基极通路,接通由L3L2D13组成的半波整流电路对电瓶充电。

CLD—1型十字板试验—静力触探两用仪研制与试用总结报告

前言 静力触探和十字板试验是两种主要的地基土原位测试方法,具有快速、经济和可靠的优点,在我国和世界各国都得到了广泛应用。 静力触探是借助机械或液压装置,将带有探头的探杆,以一定的速度压入土内。

风力发电、气力测量两用仪的制作

学校师生开展自制教具活动是推动新课程改革的重要举措,是培养学生创新精神和实践能力的必要手段.在实验教学过程中,适时恰当地运用设计新颖、构思巧妙的教具,能有效激发学生的好奇心和探究欲,启发创新思维,迸发出创造的火花.那么,在设计制作自制教具时,千万不能为了制作自制教具而制作,而是要从解决教学中的问题入手.笔者制作的气力测量仪就是按发现问题——自制教具——解决问题——拓展创新的流程完成的:(1)发现问题:在新课程教学中,多处提到风力发电,但没有现成教具.(2)自制教具:用废旧电瓶车充电器的散热风扇做发电机,"风"用人吹"气"代替.

关于CLD—1型十字板试验—静力触探仪技术鉴定会简介

CLD—1型十字板试验—静力触探两用仪,是由我所与华东电力设计院共同研制成功的。自1976年以来,用此台仪器先后在四川、武汉、上海、广州、昆明、江苏和天津等地区的30余个工地,对各种土层作过试验,打孔近300个,总进尺约3000米,作十字板试验200多组,实践证明效果良好。

Analysis for the Volatile Secondary Metabolites of Mortierella alpina

[ Objective] The study was to investigate the volatile components of secondary metabolites from M. alpine producing arachidonic acid and explore the changes in its metabolic pathway. [ Method] The air above M. alpine broth was extracted by solid-phase microextraction（SPME） during the post-exponential phase of growth and analyzed by GC-MS. [Result] 13 compounds were identified, 12 of which were sesquiterpenes with C15H24 formula and accounting for 99.62% of the complete compounds. Thujopsene-（ 12）, α-Guaiene and Aristolene were three most sesquiterpenes accounting for 10.66%, 33.69% and 34.85% of total content respectively. It can be sufficiently certified that sesquiterpene metabolic pathway existing in M. alpine. [ Coclusion] Metabolic flux of sesquiterpene pathway increased to improve its mass accumulation, because one or several key enzyme genes mutation in isoprene or sesquiterpene pathway enhanced their activities during induction of mutation from initial strain.

Influences of Various Environmental Factors on the Degradation of Deoxynivalenol in Wheat Grains

In this study, the influences of various environmental factors on the degradation of deoxynivalenol （DON） in wheat grains were investigated using a triple quadrupole LC-MS/MS system. After being treated under different conditions for 150 d, DON toxin in wheat grains exhibited the degradation rate of 78.85%-87.00% and degradation half-life of 54.57-71.44 d. According to the accelerating effects of different conditions on DON degradation, natural light 〉 strong light （10 000 lx） 〉 darkness, 90% humidity 〉50% humidity, but high temperature could not accelerate the degradation of DON toxin.

泰山蝎蝎毒的提取及效益分析

蝎毒提取最简单的方法是,有一个金属夹紧紧夹住两个触肢中的一个,不要夹破,这时会看到尾刺首有毒液排出,但是,最好的方法是用电刺激取毒,可用药理生理实验多用仪。

浅谈物理实验教学与能力培养

物理是一门实验科学,物理概念和规律大多是通过对实验现象的观察分析而概括出来的,中学物理实验既有直观生动的特点,又有科学研究的价值。加强实验教学,培养实验能力是物理学素质观的重要体现,高中物理教学大纲明确指出"观察和实验对培养学生观察和实验能力和培养学生实事求是都很重要。"实验能力是物理物理科学中很重要的能力,其中包括以下能力。明确实验目的、实验原理;

Inhibitory Effect of Oridonin on the Proliferation of NB4 Cells and Its Mechanism

Objective: To investigate the anti-proliferation e?ect of oridonin on leukemic NB4 cells and its mechanism. Methods: NB4 cells in culture medium in vitro were given di?erent concentrations of oridonin. The inhibitory rate of the cells were measured by MTT assay, cell apoptotic rate was detected by ?ow cytometry(FCM), morphology of cell apoptosis was observed by hoechst 33258 ?uorescence staining , and the activity of telomerase was detected using TRAP-PCR-ELISA before and after apoptosis occurred. Results: Oridonin (over 8 μmol/L) could decrease the telomerase activity, inhibit the growth of NB4 cells and induce apoptosis signi?cantly in a time- and dose-dependent manner. Marked morphological changes of cell apoptosis were observed by hoechst 33258 ?uorescence staining especially after the cells treated by oridonin for 48–60 h. Conclusion: Oridonin could inhibit the proliferation and induce the apoptosis of NB4 cells in vitro. One of the mechanisms may be the decrease of the telomerase activity of NB4 cells.

Chemical fingerprinting of Su-He-Xiang-Wan and attribution of major characteristic peaks for its quality control by GC-MS

A simple and facile gas chromatography-mass spectrometer （GC-MS） fingerprint of Su-He-Xiang-Wan （SHXW） was developed, the similarity analysis was conducted, and attribution of the major characteristic peaks was identified for SHXW quality control. GC-MS analysis was performed on a QP2010 instrument （Shimadzu, Japan） equipped with a capillary column of RTX-5MS. The column temperature was initiated at 50℃, held for 5 min, increased at the rate of 3 ℃/min to 120 ℃, held for 2 min, and then increased at the rate of 4 ℃/min to 220℃, held for 10 min. Helium carrier gas was used at a constant flow rate of 1.3 mL/min. Mass conditions were ionization voltage, 70 eV; injector temperature, 250℃; ion source temperature, 250 ℃; splitting ratio, 30：1; full scan mode in the 40-500 Da mass ranges with rate of 0.2 s per scan. Attribution of the major characteristic peaks was identified for SHXW by comparing the chemical standards, references of Chinese herbal medicines and the negative controls of prescription samples （NC） of SHXW. With the help of the temperature-programmed retention indices （PTRIs） used together with mass spectra and chemical standards, 25 major characteristic peaks have been identified. Nine volatile medicinal materials were identified in the prescription of SHXW by attributing to the 27 major characteristic peaks. The results demonstrate that the proposed method is a powerful approach to quality control of complex herbal medicines.

Translocation of Pesticide Residues in Tomato, Mango and Pineapple Fruits

Pesticide residues in fruit and vegetables have become a major concern associated with chemical food safety issues. Translocation of pesticides in tomato, mango and pineapple fruits in locally produced samples was investigated using gas chromatography/mass spectrophotometer （GC/MS） procedures. Samples were fractionated with respect to distance from the skin to the core and prepared for analysis. Results showed that organochlorine, organophosphate and synthetic pyrethroid residues were translocated in all fruit samples analyzed. With respect to tomato fractions, the peels retained more residues compared to the pulp and the central core. In the chemical species, organochlorines were retained more in the peels of tomato than the other fractions of the fruit. More organophosphate and organochlorine residues were detected in pineapple peels compared to the pulp. Synthetic pyrethroid residues were evenly distributed in the pineapple fruit. In mangoes, the pulp retained more chemical residues than other fractions of the fruit. More organochlorine residues were retained in the pulp of mango than in the other fractions of the fruit. Synthetic pyrethroid residues were evenly distributed throughout the mango fruit. All the chemical species identified were translocatable across the fractional parts of all the fruits. There were significant differences in translocation and residue accumulation of pesticides among the fractional parts of all samples.

Development of a Small-Scale Universal Apparatus for Evaluating Soil-Structure Interaction

This paper describes design and calibration procedures of a new small-scale testing apparatus for evaluating soil-structure interaction. Two distinct modes of loadings, such as, direct shear and pullout loadings on flexible and rigid reinforcements are implemented by the multiple functionalities of the apparatus through the use of single loading frame, dividing mechanism, instrumentation and data acquisition systems. The design is similar to the conventional apparatus; however, it includes some key modifications to adapt additional features of reinforcements. For the pullout test, the top half of the pullout box is fixed with the bottom half of the pullout box, while for the direct shear test, the top half is allowed to slide horizontally on low friction roller bearings connected to the driving mechanism. Mechanical loadings through a steel plate are used to apply the normal load in the pullout and direct shear apparatus. A series of shear and pullout tests are performed to validate the functionality of the apparatus and to examine relationships between the reinforcements and its shear and pullout resistances.

Numerical simulation of scatterometer assimilated wind and ocean wave in eastern China seas and adjacent waters

Using the latest version of Mesoscale Modeling System （MMSv3）, we assimilated wind data from the scatterometer and built a model to assimilate the wind field over eastern China seas and adjacent waters and applied the wave model WAVEWATCH-Ⅲ to test the sea area with assimilative wind and blended wind of QSCAT and NCEP as driving forces. High precision and resolution numerical wave results were obtained. Analysis indicated that if we replace the model wind result with the blended wind, better sea surface wind results and wave results could be obtained.

Portable Instrument for Normalized Difference Vegetation Index

By using four specially designed narrow bandpass filters and photodetectors in the instrument, the incident and reflected radiances of sun light on the vegetation are optically sensed, at the red and near infrared bands, then the normalized difference vegetation index(NDVI) is processed by a microprocessor. Compared with conventional spectrometer measuring method of NDVI, the instrument is easy to be used, compact, light and low-cost.

A new method to accurately measure the drift of shipborne floated gyro

Shell-feeding velocity is an important factor affecting naval gun shooting capacity. An agile shell-feeding system was designed to ensure quick implementation of the shell-feeding task. Based on composition of the agile shell-feeding system, hoist technology was studied. Working principles were discussed and the hydraulic pressure system of the hoist was constructed. The hydraulic pressure cylinder and the accumulator were analyzed and calculated. Finally, PRO/E and ADAMS were used to simulate the hoist and its hydraulic system. It was found that this type of virtuaU674.7l prototype provides a good method to actualize a physical prototype.