The proximal esophagus is rarely examined,and its inspection is often inadequate.Optical chromoendoscopy techniques such as narrow band imaging improve the detection rate of inlet patches in the proximal esophagus,a r...The proximal esophagus is rarely examined,and its inspection is often inadequate.Optical chromoendoscopy techniques such as narrow band imaging improve the detection rate of inlet patches in the proximal esophagus,a region in which their prevalence is likely underestimated.Various studies have reported correlations between these esophageal marks with different issues such as Barrett’s esophagus,but these findings remain controversial.Conflicting reports complicate the process of interpreting the clinical features of esophageal inlet patches and underestimate their importance.Unfortunately,the limited clinical data and statistical analyses make reaching any conclusions difficult.It is hypothesized that inlet patches are correlated with various esophageal and extraesophageal symptoms,diagnoses and the personalized therapeutic management of patients with inlet patches as well as the differential diagnosis for premalignant lesions or early cancers.Due to its potential underdiagnosis,there are no consensus guidelines for the management and follow up of inlet patches.This review focuses on questions that were raised from published literature on esophageal inlet patches in adults.展开更多
The finite element modeling of three dimensional structures is important for researchers especially in the field of antennas and other domains of electromagnetic waves. This paper presents a finite element calculation...The finite element modeling of three dimensional structures is important for researchers especially in the field of antennas and other domains of electromagnetic waves. This paper presents a finite element calculations and numerical analysis for the microstrip patch antennas. In this paper, two different designs have been modelled and analyzed and both designs are based on the rectangular patches. The feeding point of one design is inside the patch while the other design contains feeding point outside the patch is T shaped. The computational analysis showed some interesting results for radiation pattern and far field domain. For these designs, the characteristic impedance taken is 50 Ω and the operating frequency domain is 1.4 to 1.7 GHz. The microstrip patch antennas are encapsulated in the inert spherical atmosphere of 20 mm thickness containing air inside it.展开更多
In many arid ecosystems,vegetation frequently occurs in high-cover patches interspersed in a matrix of low plant cover.However,theoretical explanations for shrub patch pattern dynamics along climate gradients remain u...In many arid ecosystems,vegetation frequently occurs in high-cover patches interspersed in a matrix of low plant cover.However,theoretical explanations for shrub patch pattern dynamics along climate gradients remain unclear on a large scale.This context aimed to assess the variance of the Reaumuria soongorica patch structure along the precipitation gradient and the factors that affect patch structure formation in the middle and lower Heihe River Basin(HRB).Field investigations on vegetation patterns and heterogeneity in soil properties were conducted during 2014 and 2015.The results showed that patch height,size and plant-to-patch distance were smaller in high precipitation habitats than in low precipitation sites.Climate,soil and vegetation explained 82.5% of the variance in patch structure.Spatially,R.soongorica shifted from a clumped to a random pattern on the landscape towards the MAP gradient,and heterogeneity in the surface soil properties(the ratio of biological soil crust(BSC) to bare gravels(BG)) determined the R.soongorica population distribution pattern in the middle and lower HRB.A conceptual model,which integrated water availability and plant facilitation and competition effects,was revealed that R.soongorica changed from a flexible water use strategy in high precipitation regions to a consistent water use strategy in low precipitation areas.Our study provides a comprehensive quantification of the variance in shrub patch structure along a precipitation gradient and may improve our understanding of vegetation pattern dynamics in the Gobi Desert under future climate change.展开更多
We report a case of a patient in remission of acute lymphoblastic leukemia (ALL) with severe positional headaches that required an epidural blood patch (EBP) despite the higher risks of infection and introduction of b...We report a case of a patient in remission of acute lymphoblastic leukemia (ALL) with severe positional headaches that required an epidural blood patch (EBP) despite the higher risks of infection and introduction of blast cells to the epidural space. A 43-year-old male with a history of ALL presented with persistent positional headache after multiple intrathecal punctures. Despite initial improvement with medical treatment and bed rest, severe positional headache [consistent with post-dural puncture headache] constantly agonized the patient. EBP was performed after discussion of all of the medical teams involved. Following the procedure, the patient experienced immediate pain relief. EBP is very effective in the management of post-dural puncture headache (PDPH). Still there is risk of introducing infectious and/or malignant cells into the central nervous system. Alternatively, there are agents available that could be employed other than a patient’s own blood.展开更多
Recent work has established that digital images of a human face, when collected with a fixed pose but under a variety of illumination conditions, possess discriminatory information that can be used in classification. ...Recent work has established that digital images of a human face, when collected with a fixed pose but under a variety of illumination conditions, possess discriminatory information that can be used in classification. In this paper we perform classification on Grassmannians to demonstrate that sufficient discriminatory information persists in feature patch (e.g., nose or eye patch) illumination spaces. We further employ the use of Karcher mean on the Grassmannians to demonstrate that this compressed representation can accelerate computations with relatively minor sacrifice on performance. The combination of these two ideas introduces a novel perspective in performing face recognition.展开更多
In this study, we constructed a 4-element linear array antenna using four 20 GHz band microstrip patch antennas with a structure such that the signal is fed to the patch antennas from open-end coplanar waveguides with...In this study, we constructed a 4-element linear array antenna using four 20 GHz band microstrip patch antennas with a structure such that the signal is fed to the patch antennas from open-end coplanar waveguides without contact. We investigated factors related to the design of linear array patch antennas. To adjust the maximum radiation direction and reduce return loss, we optimized the spacing between the elements and their shape. With an element spacing of 11.50 mm, patch width of 3.90 mm, and patch length of 4.15 mm, we obtained a resonance frequency of 20.05 GHz and a return loss of -29.59 dB at the resonance frequency. However, in the case of a 4-element linear array antenna structure, undesired resonances occurred in frequency bands other than the design resonance frequency band of 20 GHz. To suppress these undesired resonances and obtaining stable operation at the design frequency, we propose a new structure in which the feed line is loaded with a short stub, and show through computer simulations that the occurrence of undesired resonances can be sufficiently suppressed. Furthermore, we demonstrate the problem of radiation gain reduction caused by introducing a short stub, propose a design method for a new structure in which the feed line has slits between the stubs, and show improvement of the antenna gain by 0.5 dBi.展开更多
BACKGROUND Laparoscopic pancreatoduodenectomy (LPD) has been developed gradually with the advances in surgical laparoscopic techniques. It is technically challenging to perform LPD with portal vein resection and recon...BACKGROUND Laparoscopic pancreatoduodenectomy (LPD) has been developed gradually with the advances in surgical laparoscopic techniques. It is technically challenging to perform LPD with portal vein resection and reconstruction. CASE SUMMARY A 71-year-old female patient was diagnosed with distal cholangiocarcinoma. After preoperative examination and rigorous preoperative preparation, the patient underwent LPD using 3D laparoscopy on July 17, 2018. During the surgery, we found that the tumor invaded the right wall of the portal vein;thus, pancreaticoduodenectomy combined with partial portal vein wall resection was performed. The defect of the portal vein wall was approximately 2.5 cm × 1.0 cm. The hepatic ligamentum teres was excised by laparoscopy and then recanalized in vitro. Following recanalization, the hepatic ligamentum teres was cut longitudinally and then trimmed into vascular patches that were then used to reconstruct the defect of the portal vein through 3D laparoscopy. The operative time was 560 min, and intraoperative blood loss was 100 mL. The duration of the blood occlusion time was 63 min. No blood transfusion was required. The patient underwent enhanced recovery after surgery procedures after the operation. The patient was discharged on postoperative day 11. Follow-up for 6 months after discharge showed no stenosis of the portal vein and good patency of blood flow. CONCLUSION It is safe and feasible to use the hepatic ligamentum teres patch to repair portal vein in LPD. However, the long-term patency of this technique for venous reconstruction requires further investigation.展开更多
Different feeding techniques of microstrip patch antennas with different spiral defected ground structures are presented in this paper. The investigated structures illustrate some merits in designing multi-electromagn...Different feeding techniques of microstrip patch antennas with different spiral defected ground structures are presented in this paper. The investigated structures illustrate some merits in designing multi-electromagnetic band-gap structures by adjusting the capacitance and changing the inductance through varying the width and length of spiral defected ground structure. Then by applying the three different spirals shapes (one, two and four arms) as the ground plane of microstrip patch antenna with different feeding techniques to create multi or ultra wide-band, improve the antenna gain and reduce the antenna size, it is found that the four arms spiral defected ground structure of microstrip patch antenna with offset feed gives good performance, electrical size reduction to about 75% as compared to the original patch size and ultra-wide bandwidth extends from 2 GHz up to 12 GHz with ?8 dB impedance bandwidth.展开更多
Heterotopic gastric mucosa of the proximal esophagus (HGMPE),also referred to as"inlet patch"or"cervical inlet patch",is a salmon colored patch that is usually located just distal to the upper esop...Heterotopic gastric mucosa of the proximal esophagus (HGMPE),also referred to as"inlet patch"or"cervical inlet patch",is a salmon colored patch that is usually located just distal to the upper esophageal sphincter. HGMPE is uncommon with endoscopic studies reporting a prevalence ranging from less than one percent to 18%.Most HGMPE are asymptomatic and are detected incidentally during endoscopy for evaluations of other gastrointestinal complaints.Most consider HGMPE as clinically irrelevant entity.The clinical significance of HGMPE is mainly acid related or neoplastic transformation.The reported prevalence of laryngopharyngeal reflux symptoms varies from less than 20%to as high as 73.1%.However,most of these symptoms are mild. Clinically significant acid related complications such as bleeding,ulcerations,structure and fistulization have been reported.Although rare,dysplastic changes and malignancies in association with HGMPE have also been reported.Associations with Barrett's esophagus have also been reported but the findings so far have been conflicting.There are still many areas that are unknown or not well understood and these include the natural history of HGMPE,risk factors for complications,role of Helicobacter pylori infection and factors associated with malignant transformations.Follow-up may need to be considered for patients with complications of HGMPE and surveillance if biopsies show intestinal metaplasia or dysplastic changes.Despite the overall low incidence of clinically relevant manifestations reported in the literature,HGMPE is a clinically significant entity but further researches are required to better understand its clinical significance.展开更多
The design of a seven-band stacked patch antenna for the C, X and Ku band is presented. The antenna consists of an H-slot loaded fed patch, stacked with dual U-slot loaded rectangular patch to generate the seven frequ...The design of a seven-band stacked patch antenna for the C, X and Ku band is presented. The antenna consists of an H-slot loaded fed patch, stacked with dual U-slot loaded rectangular patch to generate the seven frequency bands. The total size of the antenna is 39.25 × 29.25 mm2. The multiband stacked patch antenna is studied and designed using IE3D simulator. For verification of simulation results, the antenna is analyzed by circuit theory concept. The simulated return loss, radiation pattern and gain are presented. Simulated results show that the antenna can be designed to cover the frequency bands from (4.24 GHz to 4.50 GHz, 5.02 GHz to 5.25 GHz) in C-band application, (7.84 GHz to 8.23 GHz) in X-band and (12.16 GHz to 12.35 GHz, 14.25 GHz to 14.76 GHz, 15.25 GHz to 15.51 GHz, 17.52 GHz to 17.86 GHz) in Ku band applications. The bandwidths of each band of the proposed antenna are 5.9%, 4.5%, 4.83%, 2.36%, 3.53%, 1.68% and 1.91%. Similarly the gains of the proposed band are 2.80 dBi, 4.39 dBi, 4.54 dBi, 10.26 dBi, 8.36 dBi and 9.91 dBi, respectively.展开更多
A new photonic bandgap (PBG) cover for a patch antenna with a photonic bandgap substrate is introduced. The plane wave expansion method and the FDTD method were used to calculate such an antenna system. Numerical re-s...A new photonic bandgap (PBG) cover for a patch antenna with a photonic bandgap substrate is introduced. The plane wave expansion method and the FDTD method were used to calculate such an antenna system. Numerical re-sults for the input return loss, radiation pattern, surface wave, and the directivity of the antennas are presented. A com-parison between the conventional patch antenna and the new PBG antenna is given. It is shown that the new PBG cover is very efficient for improving the radiation directivity. The physical reasons for the improvement are also given.展开更多
General surgery hernia is a common and frequently- occurring disease in the world. In the tension-free hernia repair surgery, polypropylene （PP） patch has been confirmed as the most popular surgical implants. In thi...General surgery hernia is a common and frequently- occurring disease in the world. In the tension-free hernia repair surgery, polypropylene （PP） patch has been confirmed as the most popular surgical implants. In this study, domestic medical PP monofilament was selected as raw material whose diameter was 0.15 mm, and the patch was knitted in the warp knitting machine of 12E gauge with one bar. Using the method of orthogonal experiment with three factors and three levels, the best heat-setting process of PP mesh was determined at the temperature of 130 ~C with 10 min under tension-free conditions. The relationship between heat-setting tension and performance of the patch was discussed. Patches with different porosity were prepared, and then structural parameters including density, thickness, porosity, and mechanical properties including tensile breaking strength, bursting strength, tearing strength, flexural rigidity and suture pulling out strength were tested and compared. The experimental results show that： the smaller of the patch＇s density, the higher of the porosity; other properties including density, thickness, bending stiffness, tensile breaking strength, bursting strength, tear strength, and suture pulling out strength reduce in varying degrees. This different degree of reduction is worth summarizing.展开更多
Intrathecal drug delivery systems are commonly used in the management of chronic pain, cancer pain and neuromuscular disorders with muscle spasticity. The complications associated with in-trathecal pump placement incl...Intrathecal drug delivery systems are commonly used in the management of chronic pain, cancer pain and neuromuscular disorders with muscle spasticity. The complications associated with in-trathecal pump placement include persistent cerebrospinal fluid (CSF) leak, hygroma, meningitis, and granuloma formation. A severe persistent CSF leak may cause postdural puncture headache along with acute intracranial subdural hematoma, which can be potentially life threatening. Surgical exploration with dural repair is required to treat this severe complication when conservative treatments fail. We present a case report of severe persistent CSF leak after intrathecal pump revision that resulted in a subdural hematoma and postdural puncture headache. In this case, an epidural blood patch was performed using epidural catheter under fluoroscopic guidance to target the site of CSF leak and to avoid damaging the intrathecal catheter. This patient’s headache was resolved and intrathecal catheter remained intact after this blood patch.展开更多
Objective:To achieve transbuccal release of carbamazepine by loading in unidirectional release mucoadhesive buccal patches.Methods:Buccal patches of carbamazepine with unidirectional drug release were prepared using h...Objective:To achieve transbuccal release of carbamazepine by loading in unidirectional release mucoadhesive buccal patches.Methods:Buccal patches of carbamazepine with unidirectional drug release were prepared using hydroxypropyl methyl cellulose,polyvinyl alcohol,polyvinyl pyrrolidone and ethyl cellulose by solvent casting method.Water impermeable backing layer(Pidilite?Biaxially-oriented polypropylene film)of patches provided unidirectional drug release.They were evaluated for thickness,mass uniformity,surface pH and folding endurance.Six formulations FA2,FA8,FA10,FBI,FB14 and FB16(folding endurance above 250)were evaluated further for swelling studies,ex vivo mucoadhesive strength,ex vivo mucoadhesion time,in vitro drug release,ex vivo permeation,accelerated stability studies and FTIR and XRD spectral studies.Results:The ex vivo mucoadhesion time of patches ranged between 109 min(FA10)to 126 min(FB14).The ex vivo mucoadhesive force was in the range of 0.278 lo 0.479 kg/m/s.The in vitro drug release studies revealed that formulation FA8 released 84%and FB16 released 99.01%of drug in140 min.Conclusions:The prepared unidirectional buccal patches of carbamazepine provided a maximum drug release within specified mucoadhesion period and it indicates a potential alternative drug delivery system for systemic denvery of carbamazepine.展开更多
For the truss structure composed of active-elements with piezoelectric patches affixed to its surface,taking the mechani-cal-electric coupling effect under the action of electric loads and mechanical loads into consid...For the truss structure composed of active-elements with piezoelectric patches affixed to its surface,taking the mechani-cal-electric coupling effect under the action of electric loads and mechanical loads into consideration,the finite element model for static force analysis is established by using the theory of mechanics. The failure mechanism of piezoelectric elements is discussed and the failure criteria of piezoelectric elements are proposed. The expression of safety margins for the element of piezoelec...展开更多
[Objectives]To explore the use of Xiao’er Kechuanling Oral Liquid combined with Tulobuterol Patch on the basis of comprehensive treatment,compare it with the combined aerosol inhalation of terbutaline,ipratropium bro...[Objectives]To explore the use of Xiao’er Kechuanling Oral Liquid combined with Tulobuterol Patch on the basis of comprehensive treatment,compare it with the combined aerosol inhalation of terbutaline,ipratropium bromide and budesonide which are commonly used in clinic,and observe the curative effect in the treatment of acute bronchiolitis and the effect on serum IL-4 and IL-8.[Methods]80 children with acute bronchiolitis were randomly divided into observation group(n=40)and control group(n=40),and both groups were given routine comprehensive treatment.The observation group was treated with Xiao’er Kechuanling Oral Liquid combined with Tulobuterol Patch and budesonide,while the control group was treated with combined aerosol inhalation of terbutaline,ipratropium bromide and budesonide.The curative effect of the two groups was observed;the remission duration of cough,wheezing,dyspnea and nocturnal wheezing,and the disappearance time of wheezing rales and moist rales were observed in the two groups;the treatment course of intravenous infusion of methylprednisolone sodium succinate,oxygen inhalation time,sputum suction times and hospitalization time were observed in the two groups;the changes of serum IL-4 and IL-8 were observed before and after treatment in the two groups;the adverse drug reactions were observed.[Results](i)The total effective rate of the two groups was 100%(P>0.05),but the cure rate of the observation group(72.5%)was significantly higher than that of the control group(42.5%)(P<0.01).(ii)The disappearance time of cough,wheezing rales and moist rales and hospitalization time in the observation group were significantly shorter than those in the control group(P<0.01),the remission duration of nocturnal wheezing in the observation group was shorter than that in the control group(P<0.05),and the remission duration of wheezing and dyspnea in the control group was slightly longer than that in the control group(P>0.05).(iii)There was no significant difference(P>0.05)in serum IL-4 and serum IL-8 between the two groups before and after treatment.After treatment,the levels of serum IL-4 and IL-8 in the observation group and the control group were significantly lower than those before treatment in the observation group and the control group.[Conclusions]On the basis of comprehensive treatment,the use of Xiao’er Kechuanling Oral Liquid combined with Tulobuterol Patch in the treatment of acute bronchiolitis could reduce the effect of nocturnal wheezing on sleep,reduce the levels of serum IL-4 and IL-8,and significantly improve adverse symptoms.展开更多
This article concerns the application of wavelet techniques on molecular surfaces constituted of four-sided patches. The Polarizable Continuum Model, which is governed by the Poisson-Boltzmann equation, is treated by ...This article concerns the application of wavelet techniques on molecular surfaces constituted of four-sided patches. The Polarizable Continuum Model, which is governed by the Poisson-Boltzmann equation, is treated by means of boundary integral equations. The media inside and outside the molecular surface consist respectively of the solute and the solvent. For a given electrically charged molecule, the principal unknown is the electrostatic solvation energy when the permittivity is specified. The wavelet basis functions are constructed on the unit square which are subsequently mapped onto the patches that are assumed to be isotropically shaped and to admit similar surface areas. The initial transmission problem is recast as an integral equation in term of both the single and the double layers. Domain decomposition preconditioner serves as acceleration of the linear solver of the single layer which is badly conditioned.展开更多
This paper focuses on the high intensity filaments (dye patches) embedded in dye plumes in a wall-bounded shear flow, to investigate the shear effect on the dye patch distribution. Motivated by the widely concerned in...This paper focuses on the high intensity filaments (dye patches) embedded in dye plumes in a wall-bounded shear flow, to investigate the shear effect on the dye patch distribution. Motivated by the widely concerned inverse estimation of the source location, we try extracting useful information to know the source location from down-stream dye patches. Accordingly, we changed the dye injection location at different distances from the wall and made observations at different downstream (diffusion) distances from the source. The orientation angle and roundness of dye patches were concerned to examine the shear effect and dye patch characteristics. To capture the dye plume images, a planar laser induced fluorescence (PLIF) technique was used. The orientation and roundness of each dye patch were calculated by least-square fitting. The statistics of both the orientation angle and the roundness were compared with those in homogeneous turbulent cases to reveal the shear effect. Different from uniformly-orientated dye patches in the homogeneous flow, larger occurrence probabilities with positive orientation angles of dye patches are observed in wall-bounded shear flow, in particular, when the injection location is near the wall. As with information extraction for the inverse estimation of source location, it is found that the orientation distribution of dye patches is independent of the diffusion distance, but related with the injection location from the wall. While for the homogeneous flow cases, a strong dependence on the diffusion distance is observed in the orientation distribution profiles. As for the roundness, similar aspects are found regarding the dependencies on the injection location in shear flow and on diffusion distance in homogeneous flow.展开更多
文摘The proximal esophagus is rarely examined,and its inspection is often inadequate.Optical chromoendoscopy techniques such as narrow band imaging improve the detection rate of inlet patches in the proximal esophagus,a region in which their prevalence is likely underestimated.Various studies have reported correlations between these esophageal marks with different issues such as Barrett’s esophagus,but these findings remain controversial.Conflicting reports complicate the process of interpreting the clinical features of esophageal inlet patches and underestimate their importance.Unfortunately,the limited clinical data and statistical analyses make reaching any conclusions difficult.It is hypothesized that inlet patches are correlated with various esophageal and extraesophageal symptoms,diagnoses and the personalized therapeutic management of patients with inlet patches as well as the differential diagnosis for premalignant lesions or early cancers.Due to its potential underdiagnosis,there are no consensus guidelines for the management and follow up of inlet patches.This review focuses on questions that were raised from published literature on esophageal inlet patches in adults.
文摘The finite element modeling of three dimensional structures is important for researchers especially in the field of antennas and other domains of electromagnetic waves. This paper presents a finite element calculations and numerical analysis for the microstrip patch antennas. In this paper, two different designs have been modelled and analyzed and both designs are based on the rectangular patches. The feeding point of one design is inside the patch while the other design contains feeding point outside the patch is T shaped. The computational analysis showed some interesting results for radiation pattern and far field domain. For these designs, the characteristic impedance taken is 50 Ω and the operating frequency domain is 1.4 to 1.7 GHz. The microstrip patch antennas are encapsulated in the inert spherical atmosphere of 20 mm thickness containing air inside it.
基金National Natural Science Foundation of China,No.91425301,No.41730854The PCSIRT,No.IRT-15R06Scientific Research Starting Foundation for Doctors in Hebei GEO University,No.BQ2017003
文摘In many arid ecosystems,vegetation frequently occurs in high-cover patches interspersed in a matrix of low plant cover.However,theoretical explanations for shrub patch pattern dynamics along climate gradients remain unclear on a large scale.This context aimed to assess the variance of the Reaumuria soongorica patch structure along the precipitation gradient and the factors that affect patch structure formation in the middle and lower Heihe River Basin(HRB).Field investigations on vegetation patterns and heterogeneity in soil properties were conducted during 2014 and 2015.The results showed that patch height,size and plant-to-patch distance were smaller in high precipitation habitats than in low precipitation sites.Climate,soil and vegetation explained 82.5% of the variance in patch structure.Spatially,R.soongorica shifted from a clumped to a random pattern on the landscape towards the MAP gradient,and heterogeneity in the surface soil properties(the ratio of biological soil crust(BSC) to bare gravels(BG)) determined the R.soongorica population distribution pattern in the middle and lower HRB.A conceptual model,which integrated water availability and plant facilitation and competition effects,was revealed that R.soongorica changed from a flexible water use strategy in high precipitation regions to a consistent water use strategy in low precipitation areas.Our study provides a comprehensive quantification of the variance in shrub patch structure along a precipitation gradient and may improve our understanding of vegetation pattern dynamics in the Gobi Desert under future climate change.
文摘We report a case of a patient in remission of acute lymphoblastic leukemia (ALL) with severe positional headaches that required an epidural blood patch (EBP) despite the higher risks of infection and introduction of blast cells to the epidural space. A 43-year-old male with a history of ALL presented with persistent positional headache after multiple intrathecal punctures. Despite initial improvement with medical treatment and bed rest, severe positional headache [consistent with post-dural puncture headache] constantly agonized the patient. EBP was performed after discussion of all of the medical teams involved. Following the procedure, the patient experienced immediate pain relief. EBP is very effective in the management of post-dural puncture headache (PDPH). Still there is risk of introducing infectious and/or malignant cells into the central nervous system. Alternatively, there are agents available that could be employed other than a patient’s own blood.
文摘Recent work has established that digital images of a human face, when collected with a fixed pose but under a variety of illumination conditions, possess discriminatory information that can be used in classification. In this paper we perform classification on Grassmannians to demonstrate that sufficient discriminatory information persists in feature patch (e.g., nose or eye patch) illumination spaces. We further employ the use of Karcher mean on the Grassmannians to demonstrate that this compressed representation can accelerate computations with relatively minor sacrifice on performance. The combination of these two ideas introduces a novel perspective in performing face recognition.
文摘In this study, we constructed a 4-element linear array antenna using four 20 GHz band microstrip patch antennas with a structure such that the signal is fed to the patch antennas from open-end coplanar waveguides without contact. We investigated factors related to the design of linear array patch antennas. To adjust the maximum radiation direction and reduce return loss, we optimized the spacing between the elements and their shape. With an element spacing of 11.50 mm, patch width of 3.90 mm, and patch length of 4.15 mm, we obtained a resonance frequency of 20.05 GHz and a return loss of -29.59 dB at the resonance frequency. However, in the case of a 4-element linear array antenna structure, undesired resonances occurred in frequency bands other than the design resonance frequency band of 20 GHz. To suppress these undesired resonances and obtaining stable operation at the design frequency, we propose a new structure in which the feed line is loaded with a short stub, and show through computer simulations that the occurrence of undesired resonances can be sufficiently suppressed. Furthermore, we demonstrate the problem of radiation gain reduction caused by introducing a short stub, propose a design method for a new structure in which the feed line has slits between the stubs, and show improvement of the antenna gain by 0.5 dBi.
文摘BACKGROUND Laparoscopic pancreatoduodenectomy (LPD) has been developed gradually with the advances in surgical laparoscopic techniques. It is technically challenging to perform LPD with portal vein resection and reconstruction. CASE SUMMARY A 71-year-old female patient was diagnosed with distal cholangiocarcinoma. After preoperative examination and rigorous preoperative preparation, the patient underwent LPD using 3D laparoscopy on July 17, 2018. During the surgery, we found that the tumor invaded the right wall of the portal vein;thus, pancreaticoduodenectomy combined with partial portal vein wall resection was performed. The defect of the portal vein wall was approximately 2.5 cm × 1.0 cm. The hepatic ligamentum teres was excised by laparoscopy and then recanalized in vitro. Following recanalization, the hepatic ligamentum teres was cut longitudinally and then trimmed into vascular patches that were then used to reconstruct the defect of the portal vein through 3D laparoscopy. The operative time was 560 min, and intraoperative blood loss was 100 mL. The duration of the blood occlusion time was 63 min. No blood transfusion was required. The patient underwent enhanced recovery after surgery procedures after the operation. The patient was discharged on postoperative day 11. Follow-up for 6 months after discharge showed no stenosis of the portal vein and good patency of blood flow. CONCLUSION It is safe and feasible to use the hepatic ligamentum teres patch to repair portal vein in LPD. However, the long-term patency of this technique for venous reconstruction requires further investigation.
文摘Different feeding techniques of microstrip patch antennas with different spiral defected ground structures are presented in this paper. The investigated structures illustrate some merits in designing multi-electromagnetic band-gap structures by adjusting the capacitance and changing the inductance through varying the width and length of spiral defected ground structure. Then by applying the three different spirals shapes (one, two and four arms) as the ground plane of microstrip patch antenna with different feeding techniques to create multi or ultra wide-band, improve the antenna gain and reduce the antenna size, it is found that the four arms spiral defected ground structure of microstrip patch antenna with offset feed gives good performance, electrical size reduction to about 75% as compared to the original patch size and ultra-wide bandwidth extends from 2 GHz up to 12 GHz with ?8 dB impedance bandwidth.
文摘Heterotopic gastric mucosa of the proximal esophagus (HGMPE),also referred to as"inlet patch"or"cervical inlet patch",is a salmon colored patch that is usually located just distal to the upper esophageal sphincter. HGMPE is uncommon with endoscopic studies reporting a prevalence ranging from less than one percent to 18%.Most HGMPE are asymptomatic and are detected incidentally during endoscopy for evaluations of other gastrointestinal complaints.Most consider HGMPE as clinically irrelevant entity.The clinical significance of HGMPE is mainly acid related or neoplastic transformation.The reported prevalence of laryngopharyngeal reflux symptoms varies from less than 20%to as high as 73.1%.However,most of these symptoms are mild. Clinically significant acid related complications such as bleeding,ulcerations,structure and fistulization have been reported.Although rare,dysplastic changes and malignancies in association with HGMPE have also been reported.Associations with Barrett's esophagus have also been reported but the findings so far have been conflicting.There are still many areas that are unknown or not well understood and these include the natural history of HGMPE,risk factors for complications,role of Helicobacter pylori infection and factors associated with malignant transformations.Follow-up may need to be considered for patients with complications of HGMPE and surveillance if biopsies show intestinal metaplasia or dysplastic changes.Despite the overall low incidence of clinically relevant manifestations reported in the literature,HGMPE is a clinically significant entity but further researches are required to better understand its clinical significance.
文摘The design of a seven-band stacked patch antenna for the C, X and Ku band is presented. The antenna consists of an H-slot loaded fed patch, stacked with dual U-slot loaded rectangular patch to generate the seven frequency bands. The total size of the antenna is 39.25 × 29.25 mm2. The multiband stacked patch antenna is studied and designed using IE3D simulator. For verification of simulation results, the antenna is analyzed by circuit theory concept. The simulated return loss, radiation pattern and gain are presented. Simulated results show that the antenna can be designed to cover the frequency bands from (4.24 GHz to 4.50 GHz, 5.02 GHz to 5.25 GHz) in C-band application, (7.84 GHz to 8.23 GHz) in X-band and (12.16 GHz to 12.35 GHz, 14.25 GHz to 14.76 GHz, 15.25 GHz to 15.51 GHz, 17.52 GHz to 17.86 GHz) in Ku band applications. The bandwidths of each band of the proposed antenna are 5.9%, 4.5%, 4.83%, 2.36%, 3.53%, 1.68% and 1.91%. Similarly the gains of the proposed band are 2.80 dBi, 4.39 dBi, 4.54 dBi, 10.26 dBi, 8.36 dBi and 9.91 dBi, respectively.
文摘A new photonic bandgap (PBG) cover for a patch antenna with a photonic bandgap substrate is introduced. The plane wave expansion method and the FDTD method were used to calculate such an antenna system. Numerical re-sults for the input return loss, radiation pattern, surface wave, and the directivity of the antennas are presented. A com-parison between the conventional patch antenna and the new PBG antenna is given. It is shown that the new PBG cover is very efficient for improving the radiation directivity. The physical reasons for the improvement are also given.
文摘General surgery hernia is a common and frequently- occurring disease in the world. In the tension-free hernia repair surgery, polypropylene （PP） patch has been confirmed as the most popular surgical implants. In this study, domestic medical PP monofilament was selected as raw material whose diameter was 0.15 mm, and the patch was knitted in the warp knitting machine of 12E gauge with one bar. Using the method of orthogonal experiment with three factors and three levels, the best heat-setting process of PP mesh was determined at the temperature of 130 ~C with 10 min under tension-free conditions. The relationship between heat-setting tension and performance of the patch was discussed. Patches with different porosity were prepared, and then structural parameters including density, thickness, porosity, and mechanical properties including tensile breaking strength, bursting strength, tearing strength, flexural rigidity and suture pulling out strength were tested and compared. The experimental results show that： the smaller of the patch＇s density, the higher of the porosity; other properties including density, thickness, bending stiffness, tensile breaking strength, bursting strength, tear strength, and suture pulling out strength reduce in varying degrees. This different degree of reduction is worth summarizing.
文摘Intrathecal drug delivery systems are commonly used in the management of chronic pain, cancer pain and neuromuscular disorders with muscle spasticity. The complications associated with in-trathecal pump placement include persistent cerebrospinal fluid (CSF) leak, hygroma, meningitis, and granuloma formation. A severe persistent CSF leak may cause postdural puncture headache along with acute intracranial subdural hematoma, which can be potentially life threatening. Surgical exploration with dural repair is required to treat this severe complication when conservative treatments fail. We present a case report of severe persistent CSF leak after intrathecal pump revision that resulted in a subdural hematoma and postdural puncture headache. In this case, an epidural blood patch was performed using epidural catheter under fluoroscopic guidance to target the site of CSF leak and to avoid damaging the intrathecal catheter. This patient’s headache was resolved and intrathecal catheter remained intact after this blood patch.
基金supported by RR college of Pharmacy affiliated to Rajiv Gandhi University of Health Sciences,Bangalore,India(Grant No.RRCP\PCEUTICS\IHR&D\231)
文摘Objective:To achieve transbuccal release of carbamazepine by loading in unidirectional release mucoadhesive buccal patches.Methods:Buccal patches of carbamazepine with unidirectional drug release were prepared using hydroxypropyl methyl cellulose,polyvinyl alcohol,polyvinyl pyrrolidone and ethyl cellulose by solvent casting method.Water impermeable backing layer(Pidilite?Biaxially-oriented polypropylene film)of patches provided unidirectional drug release.They were evaluated for thickness,mass uniformity,surface pH and folding endurance.Six formulations FA2,FA8,FA10,FBI,FB14 and FB16(folding endurance above 250)were evaluated further for swelling studies,ex vivo mucoadhesive strength,ex vivo mucoadhesion time,in vitro drug release,ex vivo permeation,accelerated stability studies and FTIR and XRD spectral studies.Results:The ex vivo mucoadhesion time of patches ranged between 109 min(FA10)to 126 min(FB14).The ex vivo mucoadhesive force was in the range of 0.278 lo 0.479 kg/m/s.The in vitro drug release studies revealed that formulation FA8 released 84%and FB16 released 99.01%of drug in140 min.Conclusions:The prepared unidirectional buccal patches of carbamazepine provided a maximum drug release within specified mucoadhesion period and it indicates a potential alternative drug delivery system for systemic denvery of carbamazepine.
基金National Defense Basic Foundation (Z192002A001)National Defense Monograph Foundation
文摘For the truss structure composed of active-elements with piezoelectric patches affixed to its surface,taking the mechani-cal-electric coupling effect under the action of electric loads and mechanical loads into consideration,the finite element model for static force analysis is established by using the theory of mechanics. The failure mechanism of piezoelectric elements is discussed and the failure criteria of piezoelectric elements are proposed. The expression of safety margins for the element of piezoelec...
基金Supported by Scientific Research Project of the Department of Health of Guangxi Zhuang Autonomous Region(Z2015215)Development,Popularization and Application Project of Appropriate Medical and HealthTechnology in Guangxi(S2018015).
文摘[Objectives]To explore the use of Xiao’er Kechuanling Oral Liquid combined with Tulobuterol Patch on the basis of comprehensive treatment,compare it with the combined aerosol inhalation of terbutaline,ipratropium bromide and budesonide which are commonly used in clinic,and observe the curative effect in the treatment of acute bronchiolitis and the effect on serum IL-4 and IL-8.[Methods]80 children with acute bronchiolitis were randomly divided into observation group(n=40)and control group(n=40),and both groups were given routine comprehensive treatment.The observation group was treated with Xiao’er Kechuanling Oral Liquid combined with Tulobuterol Patch and budesonide,while the control group was treated with combined aerosol inhalation of terbutaline,ipratropium bromide and budesonide.The curative effect of the two groups was observed;the remission duration of cough,wheezing,dyspnea and nocturnal wheezing,and the disappearance time of wheezing rales and moist rales were observed in the two groups;the treatment course of intravenous infusion of methylprednisolone sodium succinate,oxygen inhalation time,sputum suction times and hospitalization time were observed in the two groups;the changes of serum IL-4 and IL-8 were observed before and after treatment in the two groups;the adverse drug reactions were observed.[Results](i)The total effective rate of the two groups was 100%(P>0.05),but the cure rate of the observation group(72.5%)was significantly higher than that of the control group(42.5%)(P<0.01).(ii)The disappearance time of cough,wheezing rales and moist rales and hospitalization time in the observation group were significantly shorter than those in the control group(P<0.01),the remission duration of nocturnal wheezing in the observation group was shorter than that in the control group(P<0.05),and the remission duration of wheezing and dyspnea in the control group was slightly longer than that in the control group(P>0.05).(iii)There was no significant difference(P>0.05)in serum IL-4 and serum IL-8 between the two groups before and after treatment.After treatment,the levels of serum IL-4 and IL-8 in the observation group and the control group were significantly lower than those before treatment in the observation group and the control group.[Conclusions]On the basis of comprehensive treatment,the use of Xiao’er Kechuanling Oral Liquid combined with Tulobuterol Patch in the treatment of acute bronchiolitis could reduce the effect of nocturnal wheezing on sleep,reduce the levels of serum IL-4 and IL-8,and significantly improve adverse symptoms.
文摘This article concerns the application of wavelet techniques on molecular surfaces constituted of four-sided patches. The Polarizable Continuum Model, which is governed by the Poisson-Boltzmann equation, is treated by means of boundary integral equations. The media inside and outside the molecular surface consist respectively of the solute and the solvent. For a given electrically charged molecule, the principal unknown is the electrostatic solvation energy when the permittivity is specified. The wavelet basis functions are constructed on the unit square which are subsequently mapped onto the patches that are assumed to be isotropically shaped and to admit similar surface areas. The initial transmission problem is recast as an integral equation in term of both the single and the double layers. Domain decomposition preconditioner serves as acceleration of the linear solver of the single layer which is badly conditioned.
文摘This paper focuses on the high intensity filaments (dye patches) embedded in dye plumes in a wall-bounded shear flow, to investigate the shear effect on the dye patch distribution. Motivated by the widely concerned inverse estimation of the source location, we try extracting useful information to know the source location from down-stream dye patches. Accordingly, we changed the dye injection location at different distances from the wall and made observations at different downstream (diffusion) distances from the source. The orientation angle and roundness of dye patches were concerned to examine the shear effect and dye patch characteristics. To capture the dye plume images, a planar laser induced fluorescence (PLIF) technique was used. The orientation and roundness of each dye patch were calculated by least-square fitting. The statistics of both the orientation angle and the roundness were compared with those in homogeneous turbulent cases to reveal the shear effect. Different from uniformly-orientated dye patches in the homogeneous flow, larger occurrence probabilities with positive orientation angles of dye patches are observed in wall-bounded shear flow, in particular, when the injection location is near the wall. As with information extraction for the inverse estimation of source location, it is found that the orientation distribution of dye patches is independent of the diffusion distance, but related with the injection location from the wall. While for the homogeneous flow cases, a strong dependence on the diffusion distance is observed in the orientation distribution profiles. As for the roundness, similar aspects are found regarding the dependencies on the injection location in shear flow and on diffusion distance in homogeneous flow.
