断氧、再给氧对萌发绿豆超弱发光的影响

无论是用氮气法还是用水浸法造成萌发绿豆断绝氧气时其超弱发光(PE)都会大幅度下降,接近本底.当重新给氧时.萌发绿豆的PE立即上升,超过正常时的PE强度,随后才逐渐下降,最后接近正常时的发光水平,形成PE峰.PE峰值随着断氧时间的增加而增大,断氧半小时,已出现明显的峰值;断氧20小时后,PE峰值不再增大、出现饱合.

高瓦斯矿井掘进头火灾处理及断氧熄火法的应用

本文在总结滇东某矿采用传统灭火方法处理高瓦斯矿井掘进头火灾得失的基础上，介绍采用“断氧熄火法”处理高瓦斯矿井掘进头火灾的成功实践，并简述该灭火方法的机理和实施要点，以及推广应用的前景。

我国医院医用氧供氧现状调查及改进建议

基于全国范围人口稠密地区诸如长三角、京津冀及山东地区的医院集中供液氧气站调查情况,从医院液氧站规模、耗氧情况、订氧频率、紧急后备系统、道路运输等诸方面分析我国医院用液氧现状,并提出了改进措施,以有利于医院可靠、安全用氧;企业可靠、安全供氧,有效规避潜在断氧风险及安全隐患,并对执行中的医用氧国家标准的相应条款提出改善性建议。

青龙煤矿钻孔密集区域顺层抽放孔内煤层氧化处理研究

青龙煤矿顺层钻孔抽放过程中,由于抽放半径小,钻孔密度大,在钻孔密集区域造成抽放孔内煤层氧化自燃,影响抽放效果,威胁矿井安全生产。本文针对顺层抽放钻孔内有大量空气、存在煤屑且钻孔内部具有良好的储热条件,采用降温、断氧、降压的措施,有效控制了钻孔内煤层氧化自燃的情况,抽放效果显著提高,为煤矿安全生产提供了保障。

金针菜干制期间防止霉变五法

一、断氧降温保鲜法金针菜干制应随摘随蒸,及时晾晒,才能做到色泽好、外形美、等级高。连绵阴雨天,应提前2小时采摘,晾晒后及时装入塑料袋内扎紧,每袋装鲜菜30斤左右。这样,袋内氧气很快断绝,花蕾体内酶的活力受到抑制．活动相对降低。袋装后随即放入井水中降温保存，有条件冷冻保鲜最好。

黄花菜干制期间防止霉变四法

1、断氧降温保鲜法’黄花菜干制应随摘随蒸，及时晾晒，才能做到色泽好、外形美、等级高。连绵阴雨天，应提前2h采摘，晾晒后及时装入塑料袋内扎紧，每袋装鲜菜15kg左右。这样，袋内氧气很快断绝，花蕾体内酶的活动受到抑制，生长活动相对降低。袋装后随即放入井水中降温保存，有条件冷冻保鲜最好。

金针菜干制期防霉变五法

一、断氧降温保鲜法 金针菜干制应随摘随蒸．及时晾晒，才能做到色泽好、外形美、等级高。连绵阴雨天，应提前2小时采摘，晾晒后及时装入塑料袋内扎紧．每袋装鲜菜15千克左右。这样，袋内氧气很快断绝．花蕾体内酶的活动受到抑制．生长活动相对降低：袋装后随即放入井水中降温保存，有条件冷冻保鲜最好。

金针菜干制期防霉变技术

金针菜采摘干制期,正值霉雨和多雨季节,处理不当,易造成霉烂.现将近年来通过不断实践、总结出的几种干制期防霉变的方法介绍如下:

The future of wireless capsule endoscopy

We outline probable and possible developments with wireless capsule endoscopy. It seems likely that capsule endoscopy will become increasingly effective in diagnostic gastrointestinal endoscopy. This will be attractive to patients especially for cancer or varices detection because capsule endoscopy is painless and is likely to have a higher take up rate compared to conventional colonoscopy and gastroscopy. Double imager capsules with increased frame rates have been used to image the esophagus for Barrett's and esophageal varices. The image quality is not bad but needs to be improved if it is to become a realistic substitute for flexible upper and lower gastrointestinal endoscopy. An increase in the frame rate, angle of view, depth of field, image numbers, duration of the procedure and improvements in illumination seem likely. Colonic, esophageal and gastric capsules will improve in quality, eroding the supremacy of flexible endoscopy, and become embedded into screening programs. Therapeutic capsules will emerge with brushing, cytology, fluid aspiration, biopsy and drug delivery capabilities. Electrocautery may also become possible. Diagnostic capsules will integrate physiological measurements with imaging and optical biopsy, and immunologic cancer recognition. Remote control movement will improve with the use of magnets and/or electrostimulation and perhaps electromechanical methods. External wireless commands will influence capsule diagnosis and therapy and will increasingly entail the use of real-time imaging. However, it should be noted that speculations about the future of technology in any detail are almost always wrong.

Hydroxyl radicals-mediated oxidative cleavage of the glycosidic bond in cellobiose by copper catalysts and its application to low-temperature depolymerization of cellulose

As the most abundant source of biomass in nature for sustainable production of fuels and chemicals,efficient depolymerization of cellulose under mild conditions,due to the difficulty in selective cleavage of itsβ-1,4-glycosidic bonds,still remains challenging.Here,we report a novel method for oxidative cleavage of the glycosidic bonds by free radicals.Probed by the cellobiose reaction,it was found that·OH radicals,generated from the decomposition of H2O2 catalyzed by CuSO4 or CuO/SiO2,were efficient for selective conversion of cellobiose to glucose and gluconic acid at a low temperature of 333 K,and their selectivities reached 30.0%and 34.6%,respectively,at 23.4%cellobiose conversion.Other radicals,such as·SO4?,also exhibited high efficacy in the cellobiose reaction.Mechanistic studies suggest that the oxidative cleavage of theβ-1,4-glycosidic bond by the free radicals involve formation of the carbon radical intermediate via abstraction of the H atom dominantly at the C1 position.Following this oxidative mechanism,treatment of microcrystalline cellulose with·OH by impregnation with H2O2 and CuSO4 catalyst at 343 K led to significant enhancement in its hydrolysis efficiency.These results demonstrate the effectiveness of this new method in the oxidative cleavage of glycosidic bonds,and its viability for the efficient depolymerization of cellulose at low temperatures,which can be further improved,for example,by exploring new free radicals and optimizing their reactivity and selectivity.

Effects of Mercuric Chloride on Antioxidant System and DNA Integrity of the Crab Charybdis japonica

Mercury （Hg） is one of the commonly encountered heavy metals, which is widespread in inshore sediments of China. In order to investigate the toxicity of Hg on marine invertebrates, we studied the effects of the divalent mercuricion （Hg2＋） （at two final concentrations of 0.0025 and 0.0050mgL-1, prepared with HgC12） on metallothionein （MT） content, DNA integrity （DNA strand breaks） and catalase （CAT） in the gills and hepatopancreas, antioxidant enzyme activities of superoxide dismutase （SOD）, catalase （CAT） and glutathione peroxidase （GPx）, in the hemolymph, gills and hepatopancreas of the portunid crab Chao,bdisjaponica for an experiment period up to 15 d. The results indicated that MT was significantly induced after 3 d, with a positive correlation with Hg2＋ dose and time in the hepatopancreas and a negative correlation with Hg2＋ dose and time in the gills. While CAT in the hemolymph was not detected, it increased in the hepatopancreas during the entire experiment; SOD and GPx in the three tissues were stimulated after 12h, both attained peak value and then reduced during the experimental period. Meanwhile, DNA strand breaks were all induced significantly after 12 h. These results suggested the detoxification strategies against Hg2＋ in three tissues of C. japonica.

Ondine's curse after posterior fossa decompression: report of one case

Objective and Methods: A case of Ondine’s curse after posterior fossa decompression was reported. A 33-year-old woman was admitted complaining 2 years of dizziness and progressive worsening of gait disturbances, and 1 year of repetitively ictal nausea. The diagnosis of Arnold-Chiari malformations was established. Results: The patient underwent suboccipital craniectomy and C1-3 laminectomy. In addition to this decompression measure, a fascial graft was sutured between the edges of the dural incision. Postoperatively, the patient lost automatic control of her respiration doting sleep and became hypercapnic and hypoxemic. Assisted ventilation was initiated. Conclusion: Ondine’s curse is possibly due to insensitivity of central chemoreceptors to carbon dioxide resulting in defective control of minute ventilation. Propofol is not recommended in eases of Ondine’s curse, and assisted ventilation until the restoration of automatic control of respiration can be of value. Oxygen inspiration alone is rather harmful than beneficial.

Effects of second phases on fracture behavior of Mg-10Gd-3Y-0.6Zr alloy

The effects of second phases on the fracture behavior of Mg-10Gd-3Y-0.6Zr alloy were investigated.The results show that the fracture mode can be generally described as ductile transgranular fracture in as-extruded condition and intergranular fracture in peak-aged condition.In as-extruded condition,the ductile transgranular fracture occurs by the formation and transgranular propagation of the microcrack from the broken primary phases.However,as the collaboration effects of precipitates inside grains and on the grain boundaries have the tendency to reduce the cohesive strength of the grain boundary,and make the grain boundaries the favorable path for crack propagation,the intergranular fracture occurs in peak-aged condition.

汽油直喷发动机排放研究与优化

随着排放法规的不断加严,对于传统动力总成而言,目前主流应对方案主要是升级发动机或者升级后处理装置。无论是升级发动机还是升级后处理装置,整车成本都会大大增加。相对于发动机本体的升级投入,后处理装置的投入相对较少一些。对于汽油直喷发动机而言,在不改变催化器配方和不增加颗粒捕集器的前提下,通过整车标定的手段达成法规要求难度巨大。本文通过优化整车标定数据的方式,最终实现颗粒物排放和气态排放物均满足国VI b排放要求,且能够满足现行RDE的要求。本文详细阐述秒采数据分析的两种方法以及优化喷油模式切换、减速断油及断油清氧等控制参数的过程及排放结果对比。

High dimension feature extraction based visualized SOM fault diagnosis method and its application in p-xylene oxidation process

Purified terephthalic acid(PTA) is an important chemical raw material. P-xylene(PX) is transformed to terephthalic acid(TA) through oxidation process and TA is refined to produce PTA. The PX oxidation reaction is a complex process involving three-phase reaction of gas, liquid and solid. To monitor the process and to improve the product quality, as well as to visualize the fault type clearly, a fault diagnosis method based on selforganizing map(SOM) and high dimensional feature extraction method, local tangent space alignment(LTSA),is proposed. In this method, LTSA can reduce the dimension and keep the topology information simultaneously,and SOM distinguishes various states on the output map. Monitoring results of PX oxidation reaction process indicate that the LTSA–SOM can well detect and visualize the fault type.

Prognostic value of 18-fluorodeoxyglucose positron emission tomography-computed tomography in resectable colorectal cancer

AIM:To assess the prognostic value of preoperative 18 fluorodeoxyglucose positron emission tomography(FDG-PET)/computed tomography(CT) in patients with resectable colorectal cancer.METHODS:One hundred sixty-three patients with resectable colorectal cancer who underwent FDG-PET/CT before surgery were included.Patient data including pathologic stage at presentation,histology,treatment,disease-free survival and the maximum standardized uptake value(SUVmax) of the primary tumor on FDG-PET/CT were retrospectively analyzed.Median follow up duration was 756(range,419-1355).The primary end point was disease-free survival.RESULTS:Twenty-five of 163 patients(15.3%) had recurrences.The median SUVmax values of the recurrence and no-recurrence groups were 8.9(range,5-24) and 8.2(range,0-23,P = 0.998).Receiver operating characteristic(ROC) curve analysis showed no significant association between SUVmax and recurrence(area under the curve = 0.5,P = 0.998,95% CI:0.389-0.611).Because a statistically significant value was not found,SUVmax was dichotomized at its median of 8.6.The disease-free survival curve was analyzed using the median SUVmax(8.6) as the cut off.Univariate and multivariate analysis did not provide evidence that disease-free survival rates for the subgroups defined by the median SUVmax were significantly different(P = 0.52,P = 0.25).CONCLUSION:Our study suggests that the high FDG uptake of primary mass in resectable colorectal cancer doesn't have a significant relationship with tumor recurrence and disease-free survival.