烟拐剔除筛的改进及烟梗分选筛清理装置的设计

烟拐剔除筛和烟梗分选筛筛网存在烟拐和烟梗堵塞的问题,为此改进了烟拐剔除筛筛网网板的支承方式,保证了烟拐顺利前移,实现了网板的自动清理,有效地改善了烟拐、烟梗的分离效果;在烟梗分选筛筛网网板上增设了一套清理装置,可以及时清除堵塞的烟梗,使筛网的开孔率保持不变,保证了长、短梗的有效分离。

高频阶梯式烟梗分选筛的设计与应用

为提升在线烟梗筛分效果,保障细支卷烟丝状梗丝加工原料质量,采用高频低强度振动技术设计一种新型烟梗筛分装置,并实现在线应用。该装置主要由两级槽体、多组条形筛和振动电机组成,以高频低强度激振力实现分选筛的往复运动,振动频率高,筛分效果好,能耗低,是一种满足烟拐与细梗连续性筛除的高频阶梯式烟梗分选筛。应用效果表明:高频阶梯式分选筛对细梗和烟拐的筛净率均高于平板筛,具有更高效的烟拐和细梗筛除效果。

采砂船锥形轴流组合分选筛的研究与应用

为了减少砂石后续的分选工作量,在链斗式采砂船上加装了锥型轴流分选筛,研究通过计算与实验确定了分选筛装置结构和转速、动力等技术参数。该分选筛有两层筛架,一层筛面隔除砂石中大石块及杂质,二层筛面隔离砂石中的小石块并进入小石块接料箱中,砂透过二层筛面经导流板进入砂接料箱。整个装置投入生产后运行稳定,替代了岸上砂卵石分选与洗砂过程,生产效益得到大大提高。

烟梗筛分系统的研究与应用

为解决烟叶打叶复烤行业工作环境恶劣、设备保养维修不便以及烟梗筛分率低等缺陷,建立一套以闭式五面筛滚烟梗分选机、皮带运输机、碎片回收系统以及除尘系统为主要设备的烟梗筛分系统。经生产实践验证,经济效益和环保效益显著提高。

城市垃圾分类筛检系统摆振机构关键参数设计方法的研究

城市垃圾的分类筛检回收关系着城市环境保护与垃圾资源再利用。本文根据北京市丰台区某垃圾回收站特定的场地限制,研究了有约束条件下的垃圾筛检机摆振机构关键参数的设计以及求解方法。依据本文得出的关键参数,该垃圾回收站成功制作出与其条件相配套的垃圾筛检系统。

新型悬挂式木片筛选装置问世

据报导,俄罗斯近年开发出一种新型悬挂式木片分选筛装置获得广泛应用。这是一种高效筛选木片设备。分为三层和两层筛孔的层筛。生产制浆造纸工艺木片,采用上。

建筑垃圾再生处置分选技术及工艺改进

为实现建筑垃圾资源再生利用,针对传统工艺存在的自动化分类程度低、再生料纯度低等问题进行设备的改进和工艺的优化。利用建筑垃圾物料的密度差异,开发出一种风力除杂分选筛,同时阐述了建筑垃圾资源化处置新工艺,实现了建筑垃圾的密度分类。结果发现,采用该工艺的建筑垃圾分类分级后得到的最终产品可达12种,再生料品质达到国家标准;与传统处置工艺相比,处置效率大幅提升,为整个建筑垃圾分选领域提供了新的参考。

铜冶炼炉灰旋流-筛分除铅回收铜镍技术

某铜冶炼炉灰中含有铅、镍、铜等金属元素,为了利用炉灰中的镍,需要降低炉灰中的铅含量,以便将炉灰返回冶炼系统回用。分别采用磁选、螺旋溜槽重选、水力旋流分选、高频细筛、水力旋流分选—细筛组合分离方式进行除铅。结果表明,几种除铅方式相比,旋流分选—细筛组合分离方式除铅效果最佳,可在原料含铅2.04%的条件下,得到富铅产物铅富集比2.67、铅回收率92.30%、镍回收率31.67%、低铅产物含铅0.24%的指标,低铅产物可以进冶炼系统回收。

Development and Application of Detection Methods for Capture and Transcription Elongation Rate of Bacterial Nascent RNA

Objective Detection and quantification of RNA synthesis in cells is a widely used technique for monitoring cell viability,health,and metabolic rate.After exposure to environmental stimuli,both the internal reference gene and target gene would be degraded.As a result,it is imperative to consider the accurate capture of nascent RNA and the detection of transcriptional levels of RNA following environmental stimulation.This study aims to create a Click Chemistry method that utilizes its property to capture nascent RNA from total RNA that was stimulated by the environment.Methods The new RNA was labeled with 5-ethyluridine(5-EU)instead of uracil,and the azido-biotin medium ligand was connected to the magnetic sphere using a combination of“Click Chemistry”and magnetic bead screening.Then the new RNA was captured and the transcription rate of 16S rRNA was detected by fluorescence molecular beacon(M.B.)and quantitative reverse transcription PCR(qRT-PCR).Results The bacterial nascent RNA captured by“Click Chemistry”screening can be used as a reverse transcription template to form cDNA.Combined with the fluorescent molecular beacon M.B.1,the synthesis rate of rRNA at 37℃is 1.2 times higher than that at 15℃.The 16S rRNA gene and cspI gene can be detected by fluorescent quantitative PCR,it was found that the measured relative gene expression changes were significantly enhanced at 25℃and 16℃when analyzed with nascent RNA rather than total RNA,enabling accurate detection of RNA transcription rates.Conclusion Compared to other article reported experimental methods that utilize screening magnetic columns,the technical scheme employed in this study is more suitable for bacteria,and the operation steps are simple and easy to implement,making it an effective RNA capture method for researchers.

Censored Composite Conditional Quantile Screening for High-Dimensional Survival Data

In this paper,we introduce the censored composite conditional quantile coefficient(cC-CQC)to rank the relative importance of each predictor in high-dimensional censored regression.The cCCQC takes advantage of all useful information across quantiles and can detect nonlinear effects including interactions and heterogeneity,effectively.Furthermore,the proposed screening method based on cCCQC is robust to the existence of outliers and enjoys the sure screening property.Simulation results demonstrate that the proposed method performs competitively on survival datasets of high-dimensional predictors,particularly when the variables are highly correlated.

振动研磨抛光机的改进设计

传统的振动研磨抛光机由带PU复合胶的圆筒形研磨容器、立式振动电机、弹簧支承架和底座机架等组成,属敞开式结构,振动和噪音大,易产生污水,环保性较差。为提高振动研磨抛光机的环境适应性和易操作性,课题组对其传统结构进行了改进:设计一个带隔振降噪材料且能自动启闭的减振消音罩;由振动分选筛对研磨物料进行自动分选,并将废水进行集中收集处理;整机采用PLC自动控制。从而,改善了振动研磨抛光机的自动化程度和环保性能,使其能更好地适应当前绿色制造的要求。

Study on Screening of Fungi with High-resistance against Chromium and on Related Characteristics

[Objective] The aim was to separate chromium-resistant microorganism from soil contaminated by chromium.[Method] Separation and purification technique was used as follows：different concentrations of Cr^6＋ were added into medium,and chromium-resistant fungi were screened after separations and domestications.The selected fungi were under preliminary identification according to its morphological and colony characteristics.Then,related biological characteristics were studied,including measurement of growth curve,growing effects by temperature,pH value and osmotic pressure.[Result] The Cr（VI） with concentration of 1 000 mg/L was separated and selected from soils in ten different places contaminated seriously by heavy metal in adjacent region of Yulin City.Considering its morphological and colony characteristics,it was preliminarily identified as saccharomycetes,which can well grow within 15-37 ℃,and whose most suitable temperature was 28℃.Bacterial strain can grow well with pH of 4-10,and the optimum pH was 7.2;besides,it can grow well with NaCl concentration of 0.5%-5.0%.Through the experiment,the bacteria was found with resistance not only to chromium,but also to heavy metals such as Pb＋Cu,Cu＋Fe,Pb＋Fe,and Pb＋Cu＋Fe.[Conclusion] The fungi selected from the experiment were of good adaptability to natural environment,and it also had resistance to other heavy metals.

Isolating and Screening of Effective Decomposing Strain of Silkworm Chrysalis Protein and Study on Parts of Its Enzymatic Properties

[Objective] The research aimed to obtain an effectively-decomposing strain of silkworm chrysalis protein and discuss its enzymatic properties.[Method] The effectively-decomposing bacteria of protein was isolated from the decayed silkworm chrysalis by using dilution plate and its enzymatic properties were tested after primary screening and second screening.The enzyme activity was determined and the intermediate and small molecule protein content in silkworm chrysalis was measured after solid-state fermentati...

Fe-Beta zeolite for selective catalytic reduction of NO_x with NH_3:Influence of Fe content

Fe doped Beta zeolite with different Fe contents were prepared by ion exchange by changing the volume or the concentration of a Fe salt solution. For a particular mass of Fe salt precursor, the concentration of the metal salt solution during ion exchange influenced the ion exchange capacity of Fe, and resulted in different activities of the Fe-Beta catalyst. Fe-Beta catalysts with the Fe contents of （2.6, 6.3 and 9） wt% were synthesized using different amounts of 0.02 mol/L Fe salt solution. These catalysts were studied by various characterization techniques and their NH3-SCR activities were evaluated. The Fe-Beta catalyst with the Fe content of 6.3 wt% exhibited the highest activity, with a temperature range of 202-616℃ where the NOx conversion was 〉 80%. The Fe content in Beta zeolite did not influence the structure of Beta zeolite and valence state of Fe. Compared with the Fe-Beta catalysts with low Fe content （2.6 wt%）, Fe-Beta catalysts with 6.3 wt% Fe content possessed more isolated Fe3. active sites which led to its higher NH3-SCR activity. A high capacity for NH3 and NO adsorption, and a high activity for NO oxidation also contributed to the high NH3-SCR activity of the Fe-Beta catalyst with 6.3 wt%. However, when the Fe content was further increased to 9.0 wt%, the amount of FexOy nanoparticles increased while the amount of isolated Fe3＋ active sites was unchanged, which promoted NH3 oxidation and decreased the NH3-SCR activity at high temperature.

Isolation,Screening and Identification of Cellulose Decomposing Strains in Straw-amended Soil

[Objective]The aim was to isolate cellulose decomposing strains with high activity from straw-amended soil.[Method]Screening of CMC solid culture and shaking culture rescreening were carried out to obtain cellulose decomposing strains with high activity from the corn straw amended soil,which were analyzed by 16rDNA sequence analysis.[Result]A bacterium and a fungus with higher endonucleases activity were obtained through preliminary screening and secondary screening,a fungus with higher filter paper enzyme activity,and a bacterium（NO.5 strain） with higher of both filter paper enzyme activity and CMC enzyme activity were obtained.The result of 16S rDNA sequence analysis showed that the similarity was 100% between NO.5 strain and Bacillus subtilis.[Conclusion]NO.5 strain was identified as Bacillus subtilis.

Studies on the Isolation and Screening of α-amylase Producing Strain and Their Enzymatic Properties

[Objective] The aim was to obtain α-amylase producing strains with some excellent properties like high temperature resistance,strong acid resistance,strong alkali resistance,etc..[Method] α-amylase producing strains were isolated and screened; furthermore their enzymatic properties were studied.[Result] 10 strains with an obvious starch hydrolysis cycle were screened out from starch screening plate coated by diluted sample,from which 3 strains with higher α-amylase activity were screened out,that was X6,X8 and X10.As for X6,X8 and X10,their optimum pH values all belonged to neutral,and their optimum temperatures were all 60 ℃.Meanwhile,Ca^2＋ could increase their enzyme thermal stability.When the concentration of Ca^2＋ was 0.02-0.04 mol/L,the enzyme thermal stability of X6 and X8 reached the highest; When the concentration of Ca^2＋ was 0.03-0.04 mol/L,that of X10 reached the highest; When the concentration of Ca^2＋ was increased continuously,those of the 3 strains all decreased.[Conclusion] The research provides theoretical basis for satisfying the demands of different industries for α-amylase with different characteristics.

Isolation,Screening and Primary Identification of a Keratin-degrading Fungus

[Objective] The paper was to provide new germplasm sources for efficient and economical degradation and utilization of animal keratin.[Method] The keratin-degrading fungus was isolated,screened and primarily identified by using the combination method of traditional isolation and screening,solid culture-medium degradation and animal test.[Result] A strain of non-pathogenic filamentous fungi with high degradation efficiency was obtained,which was preliminarily identified to be a species in Mucoraceae.[Conclusion] The discovery of the strain enriched the family members of keratin-degrading fungus,and provided new germplasm resources for degradation and utilization of animal keratin.

Mechanism of anti-arterial thrombosis of Dahuangzhecong Fang screened by Ti-Al intermetallic compound porous material

The mechanism of antithrombotic of Dahuangzhechong Fang separated and purified by Ti-Al intermetallic compound porous material (TAICPM) was researched. Dahuangzhechong Fang, which was isolated and screened by TAICPM, was used to oral rats. At the end of study, their blood and thrombus were collected. The results show that TAICPM with the pore size of 1-5 μm can screen Dahuangzhechong Fang well. Dahuangzhechong Fang can increase 6-keto-PGF1α, lower content of TXD2 and platelet. Dahuangzhechong Fang has good effect to resist arterial thrombosis.

Primary Study of Rice AFLP Analysis Optimization of Reaction Conditions and Analysis of Thermo sensitive Genic Male Sterile Rice Allelic Mutant Lines

AFLP analysis was performed between a pair of thermo_sensitive genic male sterile (TGMS) rice allelic mutant lines (5460S and 5460F). The reaction conditions for rice AFLP assay were optimized. The relative efficiencies for polymorphism detection of RFLP, RAPD and AFLP were compared. The results indicated that the efficiency for polymorphism detection in rice was in the order of AFLP>RAPD>RFLP, and also indicated that AFLP was a powerful DNA molecular marker technique for polymorphism detection, especially in the case of extremely low polymorphism, such as isogenic lines and allelic mutant lines. Some of the AFLP products between the TGMS rice allelic mutant lines were cloned. Three of them were used as mixed probes to screen BAC library of rice line 5460S. 12 positive clones were screened out. In addition, the advantages and disadvantages of these three molecular marker systems were discussed.

Screening and Cloning of RAPD Marker of Fluoride Tolerance Gene in Silkworm,Bombyx mori

In this study,silkworm strain T6,tolerant to fluoride,and silkworm strain 733xin,highly sensitive to fluoride,were used to construct the near-isogenic lines.300 random primers were used in RAPD amplification to DNAs of these lines.A molecular marker named S207 was found linked to the fluoride tolerance gene.Examination to F 2 segregated individuals of the above lines verified that this molecular marker was reliable.Subsequently,the molecular marker was cloned into a T vector (pUCm-T) for sequencing.Comparing with sequences available in the GenBank showed that this molecular marker was novel.We plan to convert it into a SCAR marker to facilitate establishment of a molecular marker assisted breeding system.