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What are the potential clinical benefits of embryo culture and assessment in a time-lapse incubator compared with a standard incubator using static assessment?This large multicentre, single-blinded, randomized controlled study included 1224 participants randomly assigned (1:1) to the time-lapse or standard incubator group. In all patients one or two embryos were transferred on day 3. The primary outcome was the implantation rate in the first embryo transfer cycle. Secondary outcomes included the cumulative implantation rate, live birth rate in the first embryo transfer cycle and cumulative live birth rate.Among 1224 participants recruited, 1182 underwent embryo transfer. The number of successfully implanted embryos in the first transfer cycle was significantly higher in the time-lapse incubator group (time-lapse group: 52.35%, standard incubator group: 47.11%, P = 0.014). The implantation rate in the first embryo transfer cycle was still significantly higher in the time-lapse group than the standard incubator group after adjusting for age, body mass index, medical centre and embryo status (relative risk 1.11, 95% confidence interval 1.02-1.20, P = 0.020). However, the cumulative implantation rate, live birth rate in the first embryo transfer cycle and cumulative live birth rate were not statistically different between the groups.The implantation rate in the first embryo transfer cycle was significantly improved in the time-lapse group, but the effect of the time-lapse system on the cumulative implantation rate or cumulative live birth rate was not significant. The embryo assessment method offered by time-lapse systems rather than an undisturbed environment may play an important role in improving the implantation rate in the first embryo transfer cycle. These results are only applicable to young patients.

Background Intravenous misplacement of a nephrostomy tube is a rare complication of percutaneous nephrolithotomy (PCNL) or percutaneous nephrostomy. The mechanism of misplacement of a nephrostomy tube into the vascular system is seldom investigated. One type of the possible mechanism is that the puncture needle penetrates a major intrarenal tributary of the renal vein and enters the collecting system. However, the guidewire is located outside the collecting system near the large branches of renal vein or perforates into the renal vein. The dilation is performed and causes a large torn injury. Subsequently, the nephrostomy tube is placed inside the vessel when radiological monitoring is not used. However, there is no imaging evidence and the scene of procedure is not demonstrated. This paper reports two cases of visualization of the renal vein filled with contrast agent during PCNL. The findings may be good evidence to support the step of renal vein injury in patients with intravenous nephrostomy tube misplacement. Case presentation We presented two cases with visualization of the renal vein filled with contrast agent during PCNL. In the process of injecting the contrast agent through the puncture needle, we could see the renal vein. Moreover, it was identified that the puncture needle tip was not on the optimal position. The position of puncture needle tip lay outside the collecting system, which was close to the calyceal infundibulum and branches of renal vein. Conclusions Visualization of the renal vein filled with contrast agent may be good evidence to verify the renal vein injury in patients with intravenous nephrostomy tube misplacement during PCNL or percutaneous nephrostomy. The suboptimal location of the puncture needle tip and visualization of the renal vein filled with contrast agent indicate the renal vein injury. One type of mechanism of intravenous nephrostomy tube misplacement is as following. Firstly, the guidewire stays outside the collecting system. Subsequently, dilatation directed by the guidewire results in the injury of the vein. Then, the nephrostomy tube migrates into the venous system due to prompt tube inserting and the direction of the sheath and/or the guidewire to the injured vein.

To reduce the Nd–Fe–B material cost and balance the utilization of rare earth sources, the misch metal (MM) substitution for Nd in the sintered magnet attracts interest. Under the processing of fabricating Nd–Fe–B magnet, hydrogen decrepitation (HD) is widely used to obtain magnetic powder; however, the HD behaviors of RE–Fe–B strips based on MM may be complex. The HD behaviors of the [(Pr, Nd)1– x MM x ]30.8FebalCo1.4 B0.97 ( $x $ = 0–1) strips were studied under 0.2 MPa pressure. We find that it is similar to the Nd–Fe–B, 2:14:1 tetragonal structure of RE–Fe–B strips based on MM which is not broken during hydrogen decrepitating. But the REFe2 phase in MM30.8FebalCo1.4B0.97 disappears dramatically as a result of hydrogenation. For the samples with MM, the HD process is quicker and the particle size gets smaller than that for free MM, especially for samples with 35 wt.% MM, which may be attributed to La and Ce elements.

To investigate the value of magnetic resonance imaging (MRI) including diffusion-weighted imaging (DWI) findings in predicting mesenchymal transition (MT) high-grade serous ovarian cancer (HGSOC).Patients with HGSOC were enrolled from May 2017 to December 2020, who underwent pelvic MRI including DWI (b = 0,1000 s/mmA total of 81 consecutive patients were recruited for pelvic MRI before surgery, including 37 (45.7%) MT patients and 44 (54.3%) non-MT patients. At univariate analysis, the features significantly related to MT HGSOC were identified as absence of discrete primary ovarian mass, pouch of Douglas implants, ovarian mass size, tumor volume, mean, SD, median, and 95th percentile apparent diffusion coefficient (ADC) values (all p0.05). At multivariate analysis, the absence of discrete primary ovarian mass {odds ratio (OR): 46.477; p = 0.025}, mean ADC value ≤ 1.105 (OR: 1.023; p = 0.009), and median ADC value ≤ 1.038 (OR: 0.982; p = 0.034) were found to be independent risk factors associated with MT HGSOC. The combination of all independent criteria yielded the largest AUC of 0.82 with a sensitivity of 83.87% and specificity of 66.67%, superior to any of the single predictor alone (p ≤ 0.012). The predictive C-index nomogram performance of the combination was 0.82.The combination of absence of discrete primary ovarian mass, lower mean ADC value, and median ADC value may be helpful for preoperatively predicting MT HGSOC.

Background: To compare potential of ultrashort time-to-echo (UTE) T2* mapping and R2* values from T2*-weighted imaging for assessing lumbar intervertebral disk degeneration (IVDD) ,with Pfirrmann grading as a reference standard.Methods: UTE-T2* and R2* values of 366 lumbar disks (L1/2-L5/S1) in 76 subjects were measured in 3 segmented regions: anterior annulus fibrosus, nucleus pulposus (NP), and posterior annulus fibrosus. Lumbar intervertebral discs were divided into 3 categories based on 5-level Pfirrmann grading: normal (Pfirrmann grade I),early disk degeneration (Pfirrmann grades II-III), and advanced disk degeneration (Pfirrmann grades IV-V). Regional differences between UTE-T2* and R2* relaxometry and correlation with degeneration were statistically analyzed.Results: UTE-T2* value correlated negatively with Pfirrmann grades; R2* value correlated positively (all P < 0.001). In NP, correlations with Pfirrmann grade were high with UTE-T2* values (r = −0.733; P < 0.001) and moderate with R2* values (r = 0.654; P < 0.001). Diagnostic accuracy of detecting early IVDD was better with UTE-T2* mapping than R2* mapping (P < 0.05),with receiver operating characteristic analysis area under the curve of 0.715–0.876.Conclusions: UTE-T2* relaxometry provides another promising magnetic resonance imaging sequence for quantitatively evaluate lumbar IVDD and was more accurate than R2* in the earlier stage degenerative process.

The distinction between solitary inflammatory lesion and solitary lung cancer remains a challenge because of their considerable overlapping computed tomography (CT) imaging features.This study aimed to verify whether spectral CT parameters can differentiate solitary lung cancer from solitary inflammatory lesions and to find their correlations with lesion size.A total of 78 patients with solitary lung lesions were included in our study. All of them underwent enhanced CT scans with Gemstone Spectral Imaging (GSI) mode, which was one of the dual-energy imaging technologies. According to maximum diameter (Dmax) of the lesion, regions of interest were collected and divided into inflammatory (group I:3 cm [IA], n = 17; ≥3 cm [IB], n = 14) and cancer groups (group II:3 cm [IIA], n = 20; ≥3 cm [IIB], n = 27). Computed tomography values (HU40keV, HU70keV), effective atomic number (Zeff), iodine concentration (IC), normalized IC (NIC), and spectral curve slopes (λ30, λ40) of each region of interest were calculated. The NIC was defined as the IC ratio of the lesion to the descending aorta. Mann-Whitney U test was used for intergroup (I vs II, IA vs IIA, IB vs IIB) and intragroup (IA vs IB, IIA vs IIB) comparisons, and receiver operating characteristic curve analysis was performed. Correlation analysis was applied to find the relationship between Dmax and GSI parameters.No significant correlation was found between GSI parameters and Dmax in the inflammatory group, whereas inverse correlations were found in the cancer group. Gemstone spectral imaging parameters (except HU70keV) of group IIA were significantly higher than those of group IIB. There were significant differences in HU40keV, IC, NIC, λ30, and λ40 between groups IB and IIB under both arterial and venous phase (P values0.05), whereas the area under the curve for λ30 under venous phase was largest, and sensitivity and specificity were 96.32% and 85.71%, respectively. However, only HU40keV and HU70keV values under the arterial phase of IIA were significantly higher than those of IA.Quantitative parameters of GSI demonstrated an inverse correlation with the lesion size of solitary lung cancer, and GSI parameters can be new ways to differentiate solitary lung cancer from solitary inflammatory lesions.

Infrared bubbles provide a unique opportunity to study the interactions between massive stars and surrounding material. We conduct a multi-wavelength study on the environment and star formation around an infrared bubble N 13. Three dust clumps and two molecular clumps are identified around N 13, which are all distributed on the layer. Young stellar objects (YSOs) are carefully searched using infrared colors and YSO candidates of WISE and Gaia DR2, and three Class I/II YSOs are found in N 13. In addition, four O-type stars identified in N 13 are probably the exciting stars. The dynamical and fragmentation ages of N 13 are 0.32–0.35 and 1.37–2.80 Myr respectively, which suggest that the radiation-driven implosion model may be dominant in N 13. By comparing the small-size bubble N 13 (R ∼ 1.9 pc) and the larger-size bubble G15.684-0.29 (R ∼ 15.7 pc) we found that star formation activity is more active in the large-size bubble. Brief comparisons of ten bubbles show that small-size bubbles have a small ratio of kinetic age versus the fragmentation time. Triggering star formation may be more active in bubbles with larger ratio between kinetic and fragmentation ages. Furthermore, the collect and collapse mechanism may play the dominant role in the large-size ones.

There is a paucity of data regarding the border zone parameters in patients with chronic coronary total occlusion (CTO). We investigated the border zone extent and contractile function and their associations with collateral flow.CTO patients (n = 47) and sex- and age-matched volunteers (n = 15) were prospectively enrolled and underwent cardiac MRI examinations to acquire cine and late-gadolinium enhancement (LGE) images. Myocardial peak strain (PS) and the time to PS were determined at the segmental level and global level. Infarct, border zone, adjacent, and remote regions were defined according to the transmural extent of infarction (TEI) by LGE at each segment. Angiographic collateral flow was evaluated using the Rentrop grading system.CTO patients with well-developed collateral flow had a higher TEI in border zone regions compared to patients with poorly developed collateral flow (p = 0.02). Conversely, CTO patients with poorly developed collaterals showed a higher TEI in infarct regions (p 0.01). Enhanced border function, characterized by greater PS and earlier time to PS, was noted in well-developed collaterals (all p 0.05). In the multivariate linear analyses, the level of collateral flow was an independent predictor of the border zone extent (β = 0.40, p = 0.02) and contractile function (radial: β = -0.42, p = 0.02; circumferential: β = 0.39, p = 0.02; and longitudinal: β = 0.47, p 0.01).In CTO patients, the presence of well-developed collateral flow was closely linked to a greater extent of LGE and contractile function in border zone regions. Our findings shed light on the cardiac MRI-based pathophysiological underpinning in border zone regions, which could offer complementary and prognostic information in clinical practice.

Background: Extensive-disease small-cell lung cancer (ED-SCLC) has been known to be rapid progression and relapse, despite highly sensitive to chemotherapy. Amrubicin (AMR), a third-generation synthetic anthracycline, was accepted as a feasible alternative compared with the standard first-line chemotherapy for previously untreated ED-SCLC. While, the efficacies of these amrubicin-based regimens are unsatisfactory. Aim: Our meta-analysis was performed to assess the efficacy and toxicity of first-line therapy comparing AMR and chemotherapy in patients with ED-SCLC. Methods: Electronic databases were searched for eligible trials updated on November 2018. Randomized-controlled trials assessing the efficacy and safety of AMR in ED-SCLC were included, of which the interested results were objective response rate (ORR), progression-free survival (PFS), overall survival (OS), and adverse events (AEs). Results: A total of 6 randomized controlled trials were included in this analysis. There are no significant differences in OS (OR=1.03, 95% CI=0.66-1.60, P=0.91), PFS (OR=1.2, 95% CI=10.77-1.88, P=0.41) or ORR (OR=1.31, 95% CI=0.90-1.92, P=0.16) with AMR (OR=0.90, 95% CI=0.76-1.05, P=0.17). The most common treatment-related AEs in the AMR group are leukopenia (OR=3.13, 95% CI=1.22-7.99, P=0.02) and neutropenia (OR=3.25, 95% CI=1.38-7.65, P=0.007). Fatigue, anemia, nausea, vomiting, diarrhea the difference between the two groups had no statistical significance. Conclusion: The results of our analysis indicated that AMR therapy demonstrated non-inferiority to the standard first-line chemotherapy for previously untreated ED-SCLC. Whether it can be accepted as an alternative regimen to the standard first-line chemotherapy is still warranted.

Begonia danxiaensis, a new tuberous species of Begonia, is described and illustrated, and supported by morphological and molecular evidences. It belongs to Begonia sect. Diploclinium and is endemic to the Danxia landforms of both Jiangxi and Hunan provinces, China. The morphological similarity between the new species and its similar taxa were compared and discussed. The new species is assigned to Vulnerable (VU) according to the IUCN Red List Categories and Criteria.

Background Coronary computed tomographic angiography is a robust non-invasive method to assess coronary artery disease (CAD) and analyze coronary plaque stability, especially for the non-calcified plaques. The aim of this study was to investigate the differential characteristics between the unstable coronary plaques and the stable coronary plaques using multi-slice computed tomography (MSCT). Methods Sixty patients with coronary heart disease (37 unstable plaques and 31 stable plaques) were included. The napkin ring thickness, napkin-ring sign, plaque CT attenuation and degree of lumen stenosis were retrospectively analyzed. The diagnostic performances of MSCT were determined to predict the unstable plaques. The difference was statistically significant if P

Xiaoyaosan, one of the best-known traditional Chinese medicine prescriptions, has been widely used in China for the treatment of mental disorders such as depression. Although both clinical application and animal experiments indicate that Xiaoyaosan has an obvious antidepressant effect, the mechanism still remains unclarified, and there are few studies quantitatively measured the biomarkers of Xiaoyaosan treatment by metabolomics to determination. In this study, 25 depressed patients and 33 healthy volunteers were recruited. A GC-MS based metabolomics approach and the multivariate statistical methods were used for analyzing the urine metabolites of depressed patients before and after treatment compared with healthy controls. Then the biomakers through metabolomics determination were carried out the quantitative analysis. In total, 5 metabolites were identified as the potential diseased and therapeutic biomarkers of depression and Xiaoyaosan. Alanine, citrate and hippurate levels were significantly increased in the urine samples from depressed patients compared with healthy controls, while phenylalanie and tyrosine levels were significantly decreased. However, after Xiaoyaosan treatment for 6 weeks, phenylalanie and tyrosine levels were significantly increased (p

Primulina suichuanensis X. L. Yu & J. J. Zhou, a new species of Gesneriaceae from Jiangxi, China, is described and illustrated. Morphologically, the new species is most similar to P. roseoalba, but differs by entire leaf blade margin, narrowly ovate bracts, reddish–purple or bluish–purple corolla, 3.0–3.4 cm long corolla tube, white filaments, and 3.6 cm long pistil. It flowers from September to November.

In order to reduce the RE-Fe-B material cost and balance the utilization of rare earth sources, misch metal substitution for Nd in the sintered magnet becomes of many interests. Under the process of fabricating high magnetic properties magnet, the strip-casting (SC) technique plays a key role, a series of rapidly solidified [(PrNd)1-xMMx]13.8FebalCo0.5Cu0.1Al0.6Ga0.07B5.9 (x = 0 ~ 1.00) (MM, Misch Metal) strips were manufactured. Subsequently, the phase constitution, microstructure and the intrinsic magnetic properties were measured. There are always stable RE2Fe14B phase in the strips with MM, which is similar to Nd-Fe-B strip. Whereas, when x ≥ 0.50, there exists REFe2 phase inevitably, and the amount of REFe2 phase gradually increases with increasing MM content. Magnetic measurements indicated that intrinsic magnetic properties, such as the saturation magnetization Ms and magneto-anisotropy field HA, deteriorate gradually by substituting PrNd with MM except for x = 0.35. For x = 0.35, the abnormal phenomenon is ascribed to Ce valence shifting toward +3 that is caused by lattice expanding. In addition, when x ≥ 0.50, La and Ce is prior to aggregate in the RE-rich phase clusters, and the content of Fe rises with the increase of MM, moreover, the interfaces between of RE2Fe14B phase and RE-rich phase become indistinct.

Accurate estimation of the recurrence of pancreatic neuroendocrine tumors help with prognosis, guide follow-up, and avoid futile treatments.To investigate whether MRI features could preoperatively estimate the recurrence of pancreatic neuroendocrine tumors (PNETs) and to refine a novel prognostic model through developing a nomogram incorporating various MRI features.Retrospective.In all, 81 patients with clinicopathologically confirmed nonmetastatic PNETs.1.5 T MR, including TQualitative and quantitative MRI features of PNET were assessed by three experienced radiologists.Uni- and multivariable analyses for recurrence-free survival (RFS) were evaluated using a Cox proportional hazards model. The MRI-based nomogram was then designed based on multivariable logistic analysis in our study and the performance of the nomogram was validated according to C-index, calibration, and decision curve analyses.MRI features, including tumor size (hazard ratio [HR]: 14.131; P = 0.034), enhancement pattern (HR: 21.821, P = 0.032), and the apparent diffusion coefficient (ADC) values (HR: 0.055, P = 0.038) were significant independent predictors of RFS at multivariable analysis. The performance of the nomogram incorporating various MRI features (with a C-index of 0.910) was improved compared with that based on tumor size, enhancement pattern, and ADC alone (with C-index values of 0.672, 0.851, and 0.809, respectively). The calibration curve of the nomogram exhibited perfect consistency between estimation and observation at 0.5, 1, and 2 years after surgery. The decision curve showed that a nomogram incorporating three features had more favorable clinical predictive usefulness than any single feature.MRI features can be considered effective recurrence predictors for PNETs after surgery. The preliminary nomogram incorporating various MRI features could assess the risk of recurrence in PNETs and may be used to optimize individual treatment strategies.4 Technical Efficacy: Stage 2 J. Magn. Reson. Imaging 2019;50:397-409.

To analyze the clinical outcomes of repeated superovulation induction in patients with adenomyosis or moderate to severe pelvic endometriosis after failure in previous IVF-ET cycles with the ultra-long protocol.We retrospectively analyzed the clinical data about 37 patients with adenomyosis or moderate to severe pelvic endometriosis in our center from 2009 to 2013, who underwent repeated IVF-ET after failure in the previous cycles with the ultra-long protocol, namely by injection of 2－6 ampoules of 3.75 mg gonadotropin-releasing hormone agonist (GnRH-a). All the patients met the following requirements: hCG-negative at 14 days after transfer, within 3－7 days after menstruation, and properly down-regulated serum follicle stimulating hormone (FSH) (10 mIU/ml), luteinizing hormone (LH) (10 mIU/ml), estradiol (E2) (30 pg/ml), follicle diameter (10 mm) and endometrial thickness, and received GnRH (Gonal-F, Serono) for ovulation induction. We compared the clinical and laboratory data and pregnancy outcomes between the first and repeated cycles before and after ovulation induction.The repeated cycles, as compared with previous ones, showed significant increases in the antral follicle count (AFC) on the first day of stimulation (7.55 ± 1.86 vs 6.45 ± 2.5, P0.05), number of follicles =≥14 mm in diameter on the hCG trigger day (7.81 ± 3.6 vs 5.56 ± 3.68, P0.05), level of E2 (［2 362.15 ± 1 210.49］ vs ［1 749.22 ± 1 139.44］ pg/ml, P0.05), and numbers of oocytes retrieved (7.51 ± 3.23 vs 4.78 ± 3.41, P0.05) and embryos transferred (2.00 ± 0.33 vs 1.50 ± 0.67, P0.05), exhibited a remarkably reduction in the dose of GnRH (［1 791.65 ± 1 889.41］ vs ［3 439.56 ± 1 836.53］ IU, P0.05), and achieved a clinical pregnancy rate of 62.16%.With proper reduction of the FSH, LH and E2 levels and follicle diameter, repeated superovulation induction for IVF-ET can improve the ovarian response and pregnancy outcomes of the patients with adenomyosis or moderate to severe pelvic endometriosis after failure in the previous IVF-ET cycles with the ultra-long protocol.目的： 了解中、重度盆腔子宫内膜异位症或子宫腺肌症患者，经超长方案体外受精胚胎移植（IVF-ET）失败后，重复采用超促排卵治疗的IVF-ET结果。方法： 回顾 2009~2013年我中心因子宫腺肌症或中、重度盆腔子宫内膜异位症，采用3.75 mg促性腺激素释放激素拮抗剂（GnRH-a）2~6针超长治疗方案进行IVF-ET的患者，选择移植后14 d血绒毛膜促性腺激素（hCG)阴性，月经来潮的3~7 d，血促卵泡生成素（FSH）、促黄体生成素（LH）、雌二醇（E2）水平，窦卵泡直径、子宫内膜厚度，仍在降调满意水平（抽血检查ＦＳＨ、ＬＨ１０ ｍＩＵ／ｍｌ，Ｅ２３０ ｐｇ／ｍｌ；Ｂ超监测窦卵泡直径10 ｍｍ）的37例患者，随即给予促性腺激素（Gn）促排卵，再次进行IVF-ET。自身比较重复促排卵前、后不同周期及妊娠结果。结果： 重复周期较前一周期相比，启动日窦卵泡（AFC）的数目［（7.55±1.86)个 vs (6.45±2.5）个］、注射hCG日直径=≥14 mm以上卵泡数［（7.81±3.6)个 vs (5.56±3.68）个］、E2水平［（2362.15±1210.49) pg/ml vs (1749.22±1139.44） pg/ml］、获卵数［（7.51±3.23)个 vs (4.78±3.41）个］以及移植胚胎数［（2.00±0.33)个 vs (1.50±0.67）个］明显增加，有统计学差异（P0.05）。重复周期Gn用量明显减少［（1 791.65±1 889.41) IU vs (3 439.56±1 836.53） IU］，有统计学差异（P0.05）。临床妊娠率达到62.16%。结论： 子宫腺肌症或中、重度盆腔子宫内膜异位症患者，经超长方案IVF-ET失败后，若FSH、LH、E2水平以及B超检测窦卵泡在降调满意范围，重复进行促排卵IVF-ET，可以改善卵巢反应性，提高妊娠结果。.

While ozonation and biological activated carbon (O3/BAC) process was widely used in advanced water treatment, the control of ozonation by-product was one of the most important objects in water treatment. In this study, the filtered water of Huyan water plant, treating Yellow River water in Shanxi, was used as the raw water to investigate the control of ozonation by-products and the biological stability by O3/BAC process. Results showed that the bromate, formaldehyde and AOC concentration of ozonation effluent were increased, yet BAC filter could effectively reduce the concentration of the by-products. When ozone dosage was less than 3.5 mg/L, the bromate of BAC filter effluent was lower than 10 ug/L. And the formaldehyde was less than 20 ug/L in the whole range of ozone dosage. Moreover, the optimal ozone dosage for the highest AOC removal of 63.25% was 2.0 mg/L. The results could provide an operation parameter for Shanxi Yellow River water advanced treatment, thus to ensure the water quality safety.

In aeromagnetic survey, it is difficult to solve the aircraft magnetic field model by flying for some unman controlled or disposable aircrafts. So a model solving method on the ground is proposed. The method simulates the geomagnetic environment where the aircraft is flying and creates the background magnetic field samples which is the same as the magnetic field arose by aircraft’s maneuvering. Then the aircraft magnetic field model can be solved by collecting the magnetic field samples. The method to simulate the magnetic environment and the method to control the errors are presented as well. Finally, an experiment is done for verification. The result shows that the model solving precision and stability by the method is well. The calculated model parameters by the method in one district can be used in worldwide districts as well.

By relaxing the linearity assumption in partial functional linear regression models, we propose a varying coefficient partially functional linear regression model (VCPFLM), which includes varying coefficient regression models and functional linear regression models as its special cases. We study the problem of functional parameter estimation in a VCPFLM. The functional parameter is approximated by a polynomial spline, and the spline coefficients are estimated by the ordinary least squares method. Under some regular conditions, we obtain asymptotic properties of functional parameter estimators, including the global convergence rates and uniform convergence rates. Simulation studies are conducted to investigate the performance of the proposed methodologies.

It is imperative for 3D modeling of mining or underground engineering to precisely and efficiently describe various interfaces, which is also the precondition for 3D visualization of underground engineering. NURBS (Non-Uniform Rational B-Splines) curve and surface technology are introduced in the paper. With help of analyzing 3D geologic structure of Laohutai mining area and comprehensive treatment of surfaces of tunnels and geologic structures. 3D geological surfaces of mining area are built which is the base of building complex 3D geologic modeling.

In order to obtain 3-D geological modeling and visualization of complicated underground engineering, a 3-D geological visualization modeling based on data structures of B-Rep and NURBS is proposed. Through comprehensive analysis of common data structure for describing the space topology in the field of computer graphics, rapid establishment of accurate topological relation of 3-D geological models for underground engineering in complicated geological conditions and cavern groups is achieved. And the high-quality geometrical data and topological relation information for the geological visualization of slope engineering are provided. By taking a large coal mine as an example, the 3-D visualization model with many functional applications based on geological information is given, which provides a basic platform for the realization of 3-D digital management.

In this study, the micro-polluted water of a reservoir filled with Yellow River water in Shanxi was used as the raw water. The removals of chemical oxygen demand (CODMn), ammonia nitrogen, petroleum substances, and volatile phenol were investigated by ozone-activated carbon process. Results showed that ozone-activated carbon process had a good removal of the pollutants mentioned above. The optimum dosage of ozone for each pollutant was 2.0 mg/L, 2.5 mg/L, 3.0 mg/L, 3.0mg/L, with the corresponding removal efficiency of 59.36 %, 88.01%, 79.31%, and 88.16%, respectively. The treated water quality could meet the standards for Drinking Water Quality (GB5749-2006) in China.

By the coagulation-flocculation jar test, the PAC adsorption property and coagulation removal property of Atrazine and Chlorothalonil, and influence on removal effect of Atrazine and Chlorothalonil by PAC Adsorption and Enhanced Coagulation in combination have been acknowledged, with different doses of PAC or polyaluminium chloride. The results of test showed that PAC can absorb Atrazine and Chlorothalonil effectively, and that the removal effect of the enhanced coagulation for Atrazine and Chlorothalonil is affected by coagulation effect. Enhanced coagulation cannot remove Atrazine effectively, while it can remove 75% of Chlorothalonil. PAC adsorption and enhanced coagulation in combination can remove Atrazine and Chlorothalonil effectively. For the initial concentration of 0.1 mg/L of Atrazine, dosage of 60mg/L of PAC and 20mg/L polyaluminium chloride can reach more than 98% removal efficiency, and make treated water standard. For the initial concentration of 0.1 mg/L of Chlorothalonil, dosage of 20mg/L of PAC and 20mg/L polyaluminium chloride can reach more than 90% removal efficiency and make treated water up to standard.

Ferromagnet is a major source of disturbance to magnetic sensor. An improved method positioning the compensation coils beside the ferromagnet is presented for disturbance compensation. The method does not ignore the distance between ferromagnet and coils, and considers the non-orthogonality of the coils. The simulation results show that the compensation precision exceeds 96% though the noise amplitude of compensation current reaches 10 mA. In contrast, precision of the method without consideration of the distance does not exceed 90%.

Based on morphological and molecular phylogenetic studies, Semiaquilegia danxiashanensis, a new species from Danxia Shan in northern Guangdong, southern China, is described and illustrated. This species is easily distinguishable from each of other three known species in the genus by characters of the flowers and fruits. In addition, molecular phylogenetic analyses of both the nuclear ITS and the plastid trnL-F region strongly supported S. danxiashanensis as a separate species from other species of Semiaquilegia. We provide a detailed morphological and habitat description, distribution, as well as colour photographs and illustrations of the new species.

The development of a fuzzy navigation controller for wheeltype agricultural vehicles with mechanism steering system was presented. The fuzzy controller was designed based on heading angle error and cross track error. The incremental PID control method was used for front wheels turning control. Simulation was done based on two wheels vehicle model. Automatic navigation control system was also developed,which was made up of the upper computer and the lower controller part. The upper computer was a flat industrial computer, and the lower controller was developed by ARM7. The experiments were done in the Xiaotangshan National Demonstration Base for Precision Agriculture. The cross track error of line track using this system was less than 0.12m, and the average cross track error was 0.04m.