Cut Length Research Articles

Effect of light quality of long-day treatments on flowering in <i>Delphinium</i>

The effects of light quality on the flowering need to be investigated for the efficient use of light-emitting diodes (LEDs) in cut flower production because of the environmentally friendly features of LEDs. Assuming long-day treatments in cut flower production, we used Delphinium species, popular long-day plants, and treated the plants at night with relatively weak light to investigate the effects of light quality. We used reproductive experimental conditions with phytotrons and long-day treatments, mainly monochromatic light, to establish an experimental system to elucidate physiological and molecular mechanisms in the near future. Before investigating the effect of monochromatic light, we first performed a long-day treatment with a widely used white LED. A similar effect to the incandescent lamp on bolting was observed, suggesting the possibility that red or blue light, but not far-red light, are adequate to promote flowering from the spectra of both light sources. Next, long-day treatments were performed with LEDs emitting monochromatic blue, red, and far-red light. In the model plant Arabidopsis thaliana, flowering is well known to be promoted by far-red and blue light and inhibited by red light. However, long-day treatment with red light for Delphinium effectively promoted flowering. Treatment with far-red light, which shows an opposite flowering response to red light in A. thaliana, also promoted the flowering of Delphinium. As for blue light, the flower budding rate of D. grandiflorum reached 100%, and that of D. elatum was lower. Compared to far-red and blue lights, long-day treatment with red light did not negatively impact cut flower quality, including cut flower length and number of florets. Our results on light quality impact on flowering response will contribute to technology for regulating Delphinium flowering and potentially also lead to the elucidation of the mechanism of unique flowering promotion by red light.

Evolution of inclusions in the whole process of GCr15 bearing steel

Inclusions have an important effect on the fatigue performance of bearing steels. Therefore, the study of the evolution of inclusions in the whole process and the reasonable control of inclusions (quantity, type, size, etc.) in steel can improve the production stability and fatigue performance of bearing steel. In this study, with the help of thermodynamic calculations and experimental studies, the evolution of the whole-process refining slag, oxygen and nitrogen content, and inclusions in bearing steel produced in a plant is systematically investigated. Overall, the refining slag composition of the refining process fluctuates less, and the oxygen content during LF refining and RH refining has been trending down, with an oxygen content of 5.7 × 10‒6 in the bearing steel billets. Although the cleanliness level is good for bearing steels, there is still room for improvement in refining slag composition, refining time, protected casting, and cut waste length.

Effectiveness of Full Length and Cut Percutaneus Nephrostomy in Pediatrics Population

Background: Purpose of the study is to evaluate the safety and efficacy of full length Percutaneous (PCN) versus cut PCN in pediatric population. PCN is performed to establish temporary drainage of obstructed or dilated renal system till definitive management. PCN is well established procedure which is performed under deep sedation, local anesthesia or general anesthesia ultrasound guided or fluoroscopic guided. Methodology: Randomized controlled study carried out in 200 children in the department of urology, Institute of Kidney Disease, Hayatabad Peshawar Pakistan from Jan 2020 to Apr 2022 and analysis was done by using SPSS version 20 to know the efficacy of the cut versus full length PCN in children. Results: This study was carried out over 200 children using cut and full length percutaneous nephrostomy tube, 100 in each group. This study includes 119 males and 81 females of mean age 5.49+ 3.127 years. The cause of obstruction was 61% PUJ obstruction, 55% VUR, 47% obstructed stone and other causes in 37%patients. Effective decompression of hydronephrosis were noted in 89% in cut length vs 82% in full end PCN (p<0.1%). Skin inflammation of 100% with cut end PCN and 20% with full length, 96% of PCN didn’t show any inflammation (p<0.001%). Dislodgment of PCN was noted multiple time in 54%, two times in 38% and 7% in full length PCN where as it is noted two times in 47% and one times in 45% in cut PCN(p<0.001%). PCN exchange was needed multiple times in 51% patients and two times in 39% patients in full length PCN where it was needed two times in 41% and one time in 50% patients in CUT PCN arm (0.001%). Conclusion: This study concludes that cut end PCN is more effective in term of PCN exchange and dislodgement but having more skin inflammation as compared to full length PCN

Respon pertumbuhan setek Bud Chip Tebu (Saccharum officinarum L.) terhadap pemberian Rootone-F dengan konsentrasi berbeda

This research is entitled: Response growth cuttings Sugarcane Chip Bud ( Saccharum officinarum L. ) against gift Rootone -F with concentration different .Experiments and organoleptic tests in this study were carried out at the Faculty of Agriculture, UNBARI Jambi in the month of March – August 2022 .The research design used in this study was a completely randomized design (CRD) with one treatment factor, namely the concentration of Rootone-F with 4 levels as follows; r0 = without using Rootone – F ; r1 = 200 ppm Rotoone-F ; r2 = 400 ppm Rotoone-F ; r3 = 600 ppm Rotoone-F. research pen this using 3 replications , so get 12 units experimen, every unit test consist from 10 cuttings so that the total is 120 cuttings . on every unit test determined by random 5 plants as sample . Observed parameters : percentage life Sugarcane chip bud cuttings (%) , shoot length of sugar cane chip bud cuttings ( cm), diameter of buds from sugar cane chip bud cuttings (mm), number root ( strand ), weight dry root cane chip bud cuttings (g) . Result data study analyzed statistics use analysis variety . When on analysis variety state influence real, then next with further test DNMRT level 5%. From result study obtained that the concentration of Rootone -F had a significant effect on the percentage of survival of sugarcane chip bud cuttings , shoot length, shoot diameter, but not significantly different on the number of roots and root dry weight. Giving Rootone-F with a concentration of 400 ppm (treatment r2 ) can give the best percentage of sugarcane chip bud cuttings survival of 83.33%

Dynamic analysis of Tapping Panel Dryness in Hevea brasiliensis reveals new insights on this physiological syndrome affecting latex production

Tapping Panel Dryness (TPD) is a physiological disorder affecting natural rubber production in Hevea brasiliensis. TPD is associated with clonal susceptibility and overexploitation of rubber trees. Most studies are based on a binary point view of the absence or presence of TPD. This study sets out to characterize the dynamic of the TPD onset through the monthly monitoring of the dry cut length. This reveals the presence of dry spots on the tapped panel of any trees. The frequency of these dry spots increases dramatically in trees developing high level of TPD. Brown bast is an irreversible form of TPD. Brown bast is correlated to a high level of dry cut length. Application of an intensive harvesting system induces early TPD occurrence, which facilitates the study of TPD. Among latex diagnosis parameters, only sucrose content is significantly associated with TPD. Other parameters are more prone to environmental effects and are not reliable as physiological markers. These findings explain the contradictory conclusions of some papers. This study suggests to use intensive harvesting system and monitor the dry cut length for genetic analysis of TPD.

PSIX-7 Sorghum Silage: Effects of Processing on Performance of Backgrounding Beef Cattle

Abstract The aim of the experiment was to evaluate the effect of processing sorghum silage (SS) at harvest, on ADG, DMI and FE of beef heifers. We used 96 Angus heifers in a completely randomized design with 6 pens of 8 heifers per treatment. Mixed model of SAS was used, and the model included the fixed effect of treatment [SS processed (PRO) or not (NPR)] with initial BW used as covariate. Significance was declared at P< 0.05. A dual-purpose sorghum (ADV2450IG, Advanta seeds, Irving, TX) was harvested (Claas Jaguar 930, Harsewinkel, Germany) at the late drought stage of grain maturity and PRO or NPR were obtained with a specific SS cracker (196 mm rolls of 125 teeth each, 40% speed differential, 1.1 mm roll gap). Each treatment was chopped at 15 mm theoretical length of cut and ensiled in polyethylene ag-bags (60 m long and 2.74 m diameter), for 45 d until starting the feeding trial. Two backgrounding diets containing (DM basis), 91.5% SS PRO or NPR (31.4±1.4% grain content on average), 6.5% soybean meal (expeller) and 3% supplement (ROC90, Provimi, Argentina); were offered for a 15 d of adaptation and 60 d of experimental period. Diets were adjusted daily to score 0.5, using the SDSU 4-point bunk scoring system and samples were taken for analyses (Rock River Laboratories, Argentina). Initial, middle and final BW was measured, while DMI was calculated from differences between DM offered and refused, within each pen. In conclusion, harvesting SS using a sorghum-specific cracker led to a 15 and 21% increase in ADG and FE, respectively, when SS was included in diets fed to backgrounding Angus heifers.

Experimental investigation of axial strength of damaged concrete-filled FRP tubes

Axial compressive strength of circular concrete-filled fiber-reinforced polymer (FRP) tubes (CFFTs) benefits greatly from a significant concrete confinement by the tube. Accidentally or deliberately induced damage to the tube would undermine the CFFT strength. In this study 33 CFFT short columns of 144–168 mm (5.67–6.61 in.) outer diameter (D) and 420–460 mm (16.53–18.11 in) height (H) (i.e. H/D = 2.74–2.92) were tested under concentric loading to failure. Tube damage was artificially induced in the form of through-thickness linear cuts at mid-height. The cut length (x) and orientation (θ) with respect to the longitudinal axis were varied. Two types of GFRP tubes were studied, namely a nominal [±55o] angle-ply tube with diameter-to-thickness ratio (D/t) = 35 and a [86°/−12°] near cross-ply with D/t = 48, to investigate two commonly available but distinctly different tubes. The effect of cuts in the two tubes studied was very similar. A nonlinear descending trend can be seen in axial strength ratio (Pn/Pno), relative to the intact CFFT strength (Pno), with x/H ratio. Initially, a rapid decent from 1.0 to 0.6 occurs in (Pn/Pno) (i.e. reduction in confinement effectiveness fcc’/fc’ from 2.0 to 1.2), as x/H ratio increases from zero to 20 % (i.e.x/D = zero to 60 %) followed by a lower rate decline to 0.52 (fcc’/fc’=1.0) at x/H = 60 % (x/D = 175 %). Vertical and diagonal cuts significantly affected strength, whereas horizontal cuts had insignificant effect on strength. Strain measurements revealed stress concentrations at the tip of the cut, where crack propagations occurred in the tube. A design-oriented simple model is presented to capture the strength reduction of the damaged CFFT column.

Effect of Biochar and Inorganic or Organic Fertilizer Co-Application on Soil Properties, Plant Growth and Nutrient Content in Swiss Chard

From the perspective of sustainable agri-food production, farmers need to make the best use of natural resources. Biochar can be a solution to adopt a more sustainable way of farming. Despite its environmental and agronomic advantages, biochar has a low plant nutrient value. This study evaluated the effect of biochar and the co-application of an inorganic or organic fertilizer on the soil properties, growth and nutrient content of Swiss chard (Beta vulgaris L. var. cycla, Caryophyllales order, Chenopodiaceae family). The experiment consisted of two factors: biochar type (from vineyard prunings and wood chips) and fertilizing source (ammonium nitrate and vermicompost). Biochars were applied at a 2% rate (w/w) and fertilizers at a dose providing 280 kg N ha−1. The soil properties (pH, EC, extractable anions, cations, total N, Corg and C/N ratio) were measured before the plants were transplanted and at the end of the growing cycle, along with the growth parameters (leaf number, length and fresh weight) of each leaf cut, the productive parameters (total number of leaves and yield per plant) at the end of the growing cycle and the leaf content of anions (NO3−, P2O43−, SO42−), cations (NH4+, Na+, K+, Ca2+, Mg2+) and total N. The co-application of biochar and a fertilizing source had a positive effect on soil properties and leaf nutrient content. Vermicompost increased plant growth by 22% and plant yield by 116%, in contrast to biochar, and increased limited leaf NO3− accumulation by about 81% in comparison to ammonium nitrate. The co-application of biochar and vermicompost is the better option to increase Swiss chard yield while preserving the nutritional and health qualities of the product.

Influence of growth regulators and length of cuttings on the propagation potential of Piper pedicellatum C. DC. – A threatened wild leafy vegetable of North-East India

Piper pedicellatum C. DC. is a wild leafy vegetable belonging to the family Piperaceae and is categorized as threatened species. It is one of the widely used popular leafy vegetable in Arunachal Pradesh, Manipur, and Sikkim, locally known as Rahre, Raro or Rori. The species is rich in vitamin A, Vitamin C, minerals, dietary fibre, antioxidants, protein, and energy and is also used as an ethnomedicinal plant. An experiment was conducted to study the effect of growth regulators IBA and IAA and length of stem cuttings on propagation potential of P. pedicellatum C. DC in the Forestry Nursery of North Eastern Regional Institute of Science and Technology during the years 2018 and 2019. The experiment revealed that the performance of stem cuttings viz., time taken for first sprouting, maximum sprout per cutting, length of sprouted shoot, number of leaves per cutting, and maximum fresh weight of shoot are found better in the treatment of T4 (L1 + IBA 1500 ppm), T7 (L1 + IAA 1500 ppm), T11 (L2 + IBA 1500 ppm) and T14 (L2 + IAA 1500 ppm), respectively. Similarly, the maximum number of roots per cutting, root length, fresh and dry weight of roots were also recorded in the treatment of T4 (L2 + IAA 1500 ppm) at par with T11 (L1 + IBA 1500 ppm) during both the year. The mean maximum survival rate of cuttings with a higher rooting percentage was observed in T11, which is at par with T7, T14, and T4. Although L2 cuttings performed better than L1 cuttings, the difference was not so prominent. Stem cuttings, irrespective of their length, treated with IBA 1500 ppm and IAA 1500 ppm showed significantly superior performance over the cuttings treated with lower concentrations of IBA and IAA. The outcome of the present study indicated that the P. pedicellatum is a promising wild leafy vegetable plant that can be exploited for conservation, domestication, and cultivation through the vegetative propagation technique, with standardization of its production technology for the adoption of commercial cultivation of the threatened species.

Ethanol extract of Bruguiera gymnorrhiza mangrove leaves and propolis activity on macroscopic healing of cuts in vivo

Background: Bruguiera gymnorrhiza mangrove and propolis are often used as natural wound treatments. Its constituent is believed to promote wound healing.
 Objective: This study aims to explore the effect of topical administration of ethanol extract of Bruguiera gymnorrhiza mangrove leaves and propolis on wound healing activity.
 Methods: Twenty-four Sprague Dawley rats were randomly assigned to one of four treatment groups (n=6): aqua dest, standard wound medicine, ethanol extract of Bruguiera gymnorrhiza mangrove leaves, and propolis extract. Following the incision, treatment was given once a day for 14 days or until the wound healed. The cut area was observed by measuring the cut length using a ruler.
 Results: Standard wound medication took 9 days to promote healing, while the negative control (aqua dest) took 11.2 days, the ethanol extract of Bruguiera gymnorrhiza mangrove leaves took 7.3 days, and the propolis extract took 7.9 days.
 Conclusions: Topical administration of Bruguiera gymnorrhiza mangrove leaves ethanol extract and propolis had equal effects on the healing of wounds. Both are more effective than conventional wound ointments at healing cuts.

Obtaining cherry seedlings of the Ashinskaya variety by green cutting

The article discusses the features of growing cherry seedlings of the Ashinskaya variety by the method of green cuttings in the conditions of the Chelyabinsk region. The objective of the research was to study the effect of the length of green cuttings on the yield of marketable seedlings. The technology of green cuttings was carried out in the period 2015-2018 under controlled conditions in a polycarbonate greenhouse. It was found that when using green cuttings 20, 30 and 40 cm long, the rooting rate of cherries increases by 12.1-27.3%, the diameter of the conditional root collar of seedlings increases by 14.8-44.4%, and the yield of marketable seedlings increases by 1.50-4.68 times compared with control (15 cm). It has been proven that the optimal length of cuttings when propagating cherry varieties Ashinskaya using the green cuttings method is 40 cm. This option allows you to get from 71.3 to 81.7 pieces of standard seedlings from one square meter of protected ground in one season.

Characterization of the Degradation of HEPA Filters Protected by Different Spark Arrestors for Various Cutting Means and Cutting Conditions

Abstract The ageing of the nuclear installations induces new challenges regarding the containment of radioactive matter especially airborne contamination. The purification of the air using fibrous filters is the most widely used technology for the containment of this contamination. However, to ensure their role, they need to be protected. The release of incandescent particles cutting processes could reduce their efficiency. Many spark arrestors are available to protect the filters from hot particles. They are designed to be implemented upstream the filter. Three technologies of spark arrestors have been tested when they are exposed to a grinder or a plasma cutting process. The experiments have been performed for two different filters (450 and 1500 m3/h flow rate). The particle size distribution of the aerosol produced by a plasma torch cutting has been measured and shows two characteristic modes for this kind of generation process. The filtration efficiency of the high efficiency particulate air (HEPA) filter has been measured before and after the cutting (NF-EN-ISO-16170). During the experiments, the pressure drop of the HEPA filters has been measured to estimate their clogging rate. Results show that the plasma cutting is a more penalizing cutting process compared to metal grinder and that the metallic fibrous medium with the finest mesh has the better performance to protect filters from sparks. The cut length and the distance between the filter and the spark arrestor have also been studied, showing a limited impact on the degradation of the filtration efficiency.

Characterization and grading of Black Bengal goat skin based on coat color

The research was conducted to study physical parameters and histological structural patterns based on the coat color of Black Bengal goat skins. Five hundred skins were randomly selected, and measured using scientific instruments and the Haematoxylin-Eosin staining method was used for histological study. Black coat color skin was found the highest (58%), the mean weight, length, and width of Black Bengal goat skin was 998.80 gm, 29.24, and 20.91 cm, respectively but there were no significant differences among the groups. The mean thickness of the skin was 1.97, 1.43, and 1.96 mm in the butt, bell, and shoulder regions, respectively, and significantly different between the groups in all categories. All slaughtered goats were flayed using the “Muchki” (Hoisting and fisting) method. The average flay cut length, depth, and mechanical and parasitic damages were 20.2 mm, 1.50 mm, 6.11, and 1.50 %, respectively. No significant difference (p > 0.05) was found in inedible fleshing by-products, but significant differences (p < 0.05) were found in trimming by-products production and salt required for curing. Salted skins were preserved for an average of 3.5 days. Hair follicles, sebaceous glands, erector pili muscles, collagen fibers, and fiber bundles were more regular in the butt region than shoulder and belly regions in the black, brown, white, and mixed coat color of Black Bengal goat skins.

Influence of the water jet system vs cavitron ultrasonic surgical aspirator for liver resection on the remnant liver.

BACKGROUNDSeveral methods, such as finger fracture, Pean crush, cavitron ultrasonic surgical aspirator (CUSA), and water jet (WJ), are used for hepatic parenchymal dissection in liver surgery. CUSA is the conventional method in Japan. WJ is a relatively novel method for parenchymal dissection. Although it has several advantages, such as lower volume of blood loss and shorter operative time, the effect of the WJ system for hepatic dissection on the remnant liver has not yet been investigated.AIMTo investigate and compare the effect of the WJ method vs CUSA on the remnant liver cut surface.METHODSThis observational study compared the two types of parenchymal transection methods (WJ vs CUSA) in liver surgery. In total, 24 and 40 patients who underwent hepatectomy using the WJ method and CUSA, respectively, were included in the analysis. Accordingly, the clinicopathological characteristics and clinical outcomes of 24 and 40 patients were compared. Furthermore, postoperative contrast-enhanced computed tomography (CT) scan was performed to assess the cut surface length of the remnant liver and the degenerative thickness of the areas with a reduced contrast effect in the dissected plane. Then, the two groups were compared.RESULTSOn CT scan, the median areas of denaturation in the liver dissection planes were 522 (range: 109.5-1242) mm2 in the CUSA group and 324 (range: 93.6-1529) mm2 in the WJ group. The area did not significantly differ between the two groups; however, the denaturation thickness of the WJ group was significantly lower than that of the CUSA group [5.8 (range: 0.7-11.1) mm vs 3.3 (range: 1.7-10.4) mm, P < 0.001].CONCLUSIONThe WJ group had significantly thinner contrast-enhanced areas in the post hepatectomy detached section than the CUSA group.

Research on the effect of thickness difference of weld seam on strip breaking during rolling in PL-TCM

At the entry of the pickling and tandem cold strip mill (PL-TCM), the unreasonable cut length of the head and tail of the strip often causes a thickness difference between the weld surfaces of the front and back strip, resulting in a weld seam with thickness difference after welding. This can easily lead to strip breaking at the weld seam in the cold rolling process. In this paper, a finite element model of roll and strip with weld seam is established to investigate the mechanism of strip breaking at weld seam due to thickness difference. By simulating the working conditions in the rolling process for weld seam with different thickness differences, the evolution of the stress state of the weld seam in the rolling process under each working condition is analyzed. The influence of thickness difference in the rolling process of the weld seam is revealed, and the effect of thickness difference on the risk of strip breaking at weld seam during the rolling process is further discussed. According to the research results, the optimization method of strip head and tail shear length was designed and applied to the industrial site. After application, the accident rate of strip breaking is reduced and the effect is as expected.

Enxerto tegumentar autógeno parcial em malha como tratamento cirúrgico de carcinossarcoma superficial de pele em um cão – relato de caso

Skin grafting refers to a reconstructive method used in cases of integumentary discontinuity, being an excellent option for covering lesions. Surgical defects resulting from the excision of cutaneous neoplasms are its main indication. A 13-year-old male SRD dog was treated at the São Lucas Veterinary Hospital, in the city of Ji-Paraná - RO, during the physical examination, a neoplastic mass was noticed on the lateral face of the left forelimb. The tegumentar grafting technique was chosen due to the length of the surgical cut and the scarcity of skin to approximate the incised edges, so the skin graft was removed from the left lateral region of the chest.

Developing a tetramonohedron with minimum cut length

In this paper, we investigate the way of unfolding a given tetramonohedron, which is a tetrahedron that consists of four congruent triangles. Our aim is finding a way that achieves the minimum cut length to develop it. We first show the rigorous way to unfold any given tetramonohedron with minimum cut length. Next, we focus on a family of tetramonohedra that consist of four congruent isosceles triangles. For this family, we apply our result and investigate their behavior.

Estimation of parameters and operating modes of the screw cutting device

The research is directed from the theoretical aspect to the development of the design of a new grinder, characterized by low energy and metal consumption. The work investigates the relationship of geometric parameters and speed modes of operation with quantitative and qualitative indicators of the screw cutter system. It is possible to increase the degree of chopping of the stems only by reducing the average cut length, i.e. by increasing the rotational speed screw knife. The experiments shows the average slice lengths and the corresponding productivity of the screw cutting pair depending on the speed of rotation of the knife. That for compliance with zootechnical requirements, modes n= 550-650 rpm.( lav = 8-4,5 sm ) - with vertical loading, and n=400-450rpm (lav = 5,5-4 sm) – at inclined feed at an angle β = 450. An increase in the frequency of rotation of the knife leads to a sharp decrease in the productivity of the cutting pair. The above numerical examples are selected in accordance with the parameters of the experimental setup and show good agreement with the experimental results.

A tracking method of equivalent constraint boundary for offshore monopile wind turbines from measured accelerations

For offshore wind turbines, the foundation constraint boundary is important for safe operation yet difficult to determine due to the invalidity of the fixed point assumption and influences from soil variability, liquidation, scour, etc. In this paper, a tracking method of equivalent constraint boundary is proposed on the basis of a limited numbers of measured responses, which are entirely different from the results by fixed constraints. The most theoretical achievement of the proposed method is that the time series of so-called first-order displacements can be accurately retrieved from the measured accelerations, leading to the significant difference from the first-order mode shape of conventional modal identification methods. The obvious advantage of the proposed method is that the change in the equivalent constraint boundary can be easily tracked just from the assembled accelerometers, which means that the difficulty and uncertainty of considering soil and water can be avoided. To verify the performance of the proposed method, two numerical examples and a beam experiment are conducted, and measured sea test data from a monopile wind turbine is processed. In detail, the first example is a cantilever beam with a theoretical fixed constraint position, and the results show that the fixed boundary position of the cantilever beam can be accurately estimated with a maximum relative error of 5.3% when six sensors and a fifth-order polynomial are used. The second example is a physical experiment of a cantilever beam and the change of constraint is considered by removing segments one by one. The experimental results show that the predicted constraint position is consistent with the cut length, with a maximum error of 0.009 m at 1.9 m. Furthermore, a 4 MW offshore monopile wind turbine evaluated by commercial software Ansys considering pile–soil interaction is analyzed, and the changes of the predicted equivalent constraint position are in good agreement with the preset values. Finally, the proposed method is applied to the field test data of a 6 MW monopile wind turbine, and a stable estimation of the equivalent constraint position can be obtained. The good accuracy of the proposed method demonstrates its capability in monitoring structural health for offshore wind turbines.

Validation of CT-Based Three-Dimensional Preoperative Planning in Comparison with Acetate Templating for Primary Total Hip Arthroplasty.

ObjectiveThis study aims to compare the accuracy of CT‐based preoperative planning with that of acetate templating in predicting implant size, neck length, and neck cut length, and to evaluate the reproducibility of the two methods.MethodsThis prospective study was conducted between August 2020 and March 2021. Patients who underwent elective primary total hip arthroplasty by a single surgeon were assessed for eligibility. The included patients underwent both acetate templating and CT‐based planning by two observers after the operation. Each observer conducted both acetate templating and CT‐based planning twice for each case. The outcome measures included the following: (1) the accuracy of surgical planning in predicting implant size, calcar length, and neck length, which was defined as the difference between the planned size and length and the actual size and length; (2) reproducibility of the two planning techniques, which were assessed by inter‐observer and intra‐observer reliability analysis; (3) the influence of potential confounding factors on planning accuracy, which was evaluated using generalized estimating equations.ResultsA total of 57 cases were included in the study. CT‐based planning was more accurate than acetate templating for predicting cup size (93% vs 79%, p < 0.001) and stem size (93% vs 75%, p < 0.001). When assessed by mean absolute difference, the comparison between acetate templating and CT‐based planning was 4.28 mm vs 3.74 mm (p = 0.122) in predicting neck length and 3.05 mm vs 2.93 mm (p = 0.731) in predicting neck cut length. In the inter‐observer reliability analysis, an intraclass correlation coefficient (ICC) of 0.790 was achieved for predicting cup size, and an ICC of 0.966 was achieved for predicting stem size using CT‐based planning. In terms of intra‐observer reliability, Observer 1 achieved an ICC of 0.803 for predicting cup size and 0.965 for predicting stem size in CT‐based planning. Observer 2 achieved ICC values of 0.727 and 0.959 for predicting cup and stem sizes, respectively. The average planning time was 6.48 ± 1.55 min for CT‐based planning and 6.12 ± 1.40 min for acetate templating (p = 0.015).ConclusionThe CT‐based planning system is more accurate than acetate templating for predicting implant size and has good reproducibility in total hip arthroplasty.