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Based on the operation data of the hydrocracking unit, the simulation process of hydrogen sulfide removal stripper is constructed by Aspen Plus software, and ELECNRTL is used to simulate and optimize - 26 - the process of hydrogen sulfide removal of oil from low pressure separator. The effects of key parameters, such as stripping steam consumption, feed temperature and feed position of oil from cold low pressure separator, feed position of oil from hot low pressure separator, on hydrogen sulfide removal efficiency and energy consumption of stripper are investigated. The results show that under the existing operating conditions, the stripping steam is excessive, and the energy consumption is unreasonable. With the adjustment of feed position of oil from hot low pressure separator, the stripping steam consumption reduces from 3. 5 t/h to 1. 5 t/h. Combined with the comprehensive analysis of the heat exchange network of the unit, following the principles of high heat high utilization and energy cascading utilization, the improvement and optimization measures for the preheating process of oil from cold low pressure separator are put forward. Through the rational use of high temperature potential heat, the overall energy efficiency of the unit is effectively improved. [ABSTRACT FROM AUTHOR]

Optical coherence tomography (OCT) is a real-time, cross-sectional optical imaging technology. It is analogous to ultrasonography, except that OCT uses light waves instead of sound waves, and can provide three-dimensional morphological images of living tissues with a micrometer resolution. Through the use of endoscopes, needles, catheters and laparoscopes, OCT has demonstrated tremendous imaging potential in tumor surgery. The current studies suggest that OCT has potential for clinical applications in the following fields of gastrointestinal tumor surgery: (1) Early tumor detection and diagnosis: OCT can distinguish differences between polyp tissue, normal tissue and malignant tissue. It could possibly identify premalignant lesions or conditions potentially predisposing to malignancy, such as gastric and intestinal metaplasia, gastritis associated with Helicobacter pylori, and early gastric cancer involving the mucosa or submucosa. In addition, OCT can differentiate between adenomatous polyps and hyperplastic polyps. (2) Optical biopsy of lymph nodes: As a high-resolution, near-IR imaging modality, OCT is capable of visualizing microscopic features within tissue, distinguishing lymph node tissue from surrounding adipose tissue, revealing nodal structures such as germinal centers and intra-nodal vessels. Consequently, OCT has the ability to show changes in node microarchitecture during metastatic tumor infiltration. (3) Intraoperative guidance for real-time determination of surgical margins: In other tumors such as oral squamous cell carcinoma and breast cancer, it has been demonstrated that OCT can be used to rapidly scan large areas of tissue, to guide at the cellular level the surgical resection of neoplastic disease, and to scan tumor margins for the presence of residual disease, tumor foci, and potentially even metastasizing tumor cells. It implies that colorectal neoplasms surgeons can possibly use the laparoscopic OCT to detect the intestinal tumor margin and lymph nodes during operation in the future, so as to determine the appropriate range of bowel resection and lymph node dissection. At present, there are few reports about the intra-operative application of OCT in the field of gastrointestinal tumor surgery. Thus there is a tremendous opportunity for further research in this field.

The rules of acupoint selection for diabetic peripheral neuropathy (DPN) based on data mining technology are analyzed. Literature regarding acupuncture for DPN published in core journals from January of 2005 to December of 2014 was retrieved in CNKI database and Wanfang database to establish a database of acupuncture prescriptions, which were included into the TCM Inheritance Platform software (Version 2.0). The data mining methods, including rule analysis, revised mutual information, etc. were applied to analyze the acupuncture prescriptions and the frequency of each acupoint was calculated. The results indicated Zusanli (ST 36), Sanyinjiao (SP 6), Quchi (LI 11), Yanglingquan (GB 34), Hegu (LI 4), Shenshu (BL 23), etc. were mostly selected in acupuncture for DPN; in addition, 19 acupoint combinations were acquired. It is concluded that acupuncture for DPN applied reinforcing methods as main rules, accompanied with promoting blood and qi circulation; the acupoint selection focused on yangming meridians and back- shu points.

Objective: To analyze the biodiversity of halotolerant and halophilic bacteria the bacteria in saline-alkaline soils in Songnen Plain, we isolated and purified bacteria samples in the area., Methods: Halotolerant and halophilic bacteria were isolated from the enriched cultures of the saline-alkline soil samples through the traditional culture method, and 16S rRNA sequences were amplified and analyzed for the determination of phylogenetic relationships., Results: Forty strains were obtained and classified into 34 species, 16 genera, 8 families, 3 phylum (Firmicutes, gamma-Proteobacteria and Actinobacteria) in the Domain Bacteria. The genus Staphylococcus is the predominant group, followed by Halomonas, Oceanbacillus, Bacillus, Kocuria and Pseudomonas. The 16S rRNA sequences of 9 strains showed 97.2 to 99.0% similarities with their closest type strains, suggesting that they may be the potential novel species. The salt tolerance of the strains is mainly concentrated on the 5% - 10% NaCl while alkaline pH resistance of the strains is between pH 9 and 12. Based on the NaCl dependence, 62.5% of the strains were grouped into the halotolerant bacteria, and the rest into the moderate halophiles., Conclusion: The halotolerant and halophilic bacteria are very rich in the saline-alkaline soils in Songnen Plain, and the genera Staphylococcus and Halomonas are the predominant groups. Almost all the bacteria from this area could tolerate not only at the high concentration of NaCl, but also at high alkaline pH. More importantly, a number of novel species may be included in this area.